The present disclosure relates to wireless communication systems, particularly to wireless communication systems that use one or more bandwidth parts set within one carrier band.
Background technology
[0002]
　The 3rd Generation Partnership Project (3GPP) is working on standardization of the 5th generation mobile communication system (5G) for introduction after 2020. 5G is realized by a combination of continuous improvement / evolution of LTE and LTE-Advanced and innovative improvement / development by introducing a new 5G air interface (new Radio Access Technology (RAT)). It is supposed to be done. The new RAT is, for example, a frequency band higher than the frequency band (eg, 6 GHz or less) targeted by the continuous development of LTE / LTE-Advanced, such as a centimeter wave band of 10 GHz or more and a millimeter of 30 GHz or more. Supports wave bands.
[0003]
　As used herein, the 5th generation mobile communication system is also referred to as a 5G system or a Next Generation (NextGen) System (NG System). The new RAT for 5G System is called New Radio (NR), 5G RAT, or NG RAT. The new Radio Access Network (RAN) for the 5G System is called 5G-RAN or NextGen RAN (NG RAN). The new base station in 5G-RAN is called NR NodeB (NR NB) or gNodeB (gNB). The new core network for the 5G System is called the 5G Core Network (5G-CN or 5GC) or NextGen Core (NG Core). A wireless terminal (User Equipment (UE)) that connects to a 5G System is called a 5G UE, NextGen UE (NG UE), or simply UE. Formal names for RAT, UE, radio access networks, core networks, network entities (nodes), and protocol layers for 5G systems will be determined in the future as standardization work progresses.
[0004]
　In addition, the term “LTE” as used herein includes improvements and developments of LTE and LTE-Advanced to enable interworking with 5G Systems, unless otherwise specified. Improvements and developments of LTE and LTE-Advanced for interworking with 5G Systems are also called LTE-Advanced Pro, LTE +, or enhanced LTE (eLTE). In addition, “Evolved Packet Core (EPC)”, “Mobility Management Entity (MME)”, “Serving Gateway (S-GW)”, and “Packet Data Network (PDN) Gateway (P-GW)” as used herein. ) ”And other terms related to LTE networks or logical entities include these improvements and developments to enable interworking with the 5G System, unless otherwise noted. Improved EPC, MME, S-GW, and P-GW include, for example, enhanced EPC (eEPC), enhanced MME (eMME), enhanced S-GW (eS-GW), and enhanced P-GW (eP-GW). ) Also called.
[0005]
　In LTE and LTE-Advanced, for quality of service (QoS) and packet routing, bearers for each QoS class and each PDN connection are RAN (ie, Evolved Universal Terrestrial RAN (E-UTRAN)) and core network (ie, Evolved Universal Terrestrial RAN (E-UTRAN)). Used in both EPC). That is, in the Bearer-based QoS (or per-bearer QoS) concept, one or more Evolved Packet System (EPS) bearers are configured between the UE and the P-GW in the EPC, and multiple Evolved Packet System (EPS) bearers with the same QoS class. Service Data Flows (SDFs) are transferred through a single EPS bearer that satisfies these QoS.
[0006]
　In contrast, in 5G Systems, radio bearers may be used in NG-RAN, but it is being considered that bearers are not used within 5GC and in the interface between 5GC and NG-RAN. Specifically, PDU flows are defined instead of EPS bearer, and one or more SDFs are mapped to one or more PDU flows. The PDU flow between the 5G UE and the user plane termination entity in NG Core (ie, the entity equivalent to P-GW in EPC) corresponds to the EPS bearer in the EPS Bearer-based QoS concept. The PDU flow corresponds to the finest granularity of packet forwarding and treatment within the 5G system. That is, the 5G System adopts the Flow-based QoS (or per-flow QoS) concept instead of the Bearer-based QoS concept. In the Flow-based QoS concept, QoS is handled on a PDU flow basis. The association between the 5G UE and the data network is called the PDU session. PDU session is a term equivalent to LTE and LTE-Advanced PDN connection. Multiple PDU flows can be configured in one PDU session. The 3GPP specification specifies the 5G QoS Indicator (5QI), which is the equivalent of LTE QCI, for the 5G System.
[0007]
　The PDU flow is also called "QoS flow". The QoS flow is the finest granularity of the QoS treatment within the 5G system. User plane traffic with the same N3 marking value in the PDU session corresponds to the QoS flow. N3 marking corresponds to the PDU flow ID mentioned above and is also called QoS flow Identity (QFI) and further called Flow Identification Indicator (FII). Here, there is a one-to-one relationship (ie, one-to-one mapping) between at least each 5QI specified in the specification and the corresponding QFI having the same value (number).
[0008]
　Figure 1 shows the basic architecture of a 5G system. The UE establishes one or more Signaling Radio Bearers (SRBs) and one or more Data Radio Bearers (DRBs) with the gNB. 5GC and gNB establish a control plane interface and a user plane interface for the UE. The control plane interface between 5GC and gNB (ie, RAN) is called the N2 interface, NG2 interface, or NG-c interface, which transfers Non-Access Stratum (NAS) information and controls between 5GC and gNB. Used for information (eg, N2 AP Information Element). The user plane interface between 5GC and gNB (ie, RAN), called the N3 interface, NG3 interface, or NG-u interface, is the packet of one or more PDU flows within the UE's PDU session. Used for forwarding.
[0009]
　Note that the architecture shown in FIG. 1 is only one of a plurality of 5G architecture options (or deployment scenarios). The architecture shown in FIG. 1 is an architecture called "Standalone NR (in NextGen System)" or "Option 2". 3GPP is also considering several network architectures for multi-connectivity operations using E-UTRA and NR radio access technologies. A typical example of multi-connection operation is dual connectivity (DC) in which one master node (Master node (MN)) and one secondary node (Secondary node (SN)) cooperate with each other and communicate with one UE at the same time. )). The dual connectivity operation using E-UTRA and NR wireless access technology is called Multi-RAT Dual Connectivity (MR-DC). MR-DC is a dual connectivity between E-UTRA and NR nodes.
[0010]
　In MR-DC, one of the E-UTRA node (ie, eNB) and NR node (ie, gNB) operates as the master node (Master node (MN)), and the other is the secondary node (Secondary node (SN)). At least the MN is connected to the core network. The MN provides one or more Master Cell Group (MCG) cells to the UE, and the SN provides one or more Secondary Cell Group (SCG) cells to the UE. MR-DC includes "MR-DC with the EPC" and "MR-DC with the 5GC".
[0011]
　MR-DC with the EPC includes E-UTRA-NR Dual Connectivity (EN-DC). In EN-DC, the UE is connected to an eNB acting as an MN and a gNB acting as an SN. Furthermore, the eNB (ie, Master eNB) is connected to the EPC, and the gNB (ie Secondary gNB) is connected to the Master eNB via the X2 interface.
[0012]
　MR-DC with the 5GC includes NR-E-UTRA Dual Connectivity (NE-DC) and NG-RAN E-UTRA-NR Dual Connectivity (NG-EN-DC). In NE-DC, UE is connected to gNB acting as MN and eNB operating as SN, gNB (ie, Master gNB) is connected to 5GC, and eNB (ie Secondary eNB) is connected to Master gNB via Xn interface. Be connected. On the other hand, in NG-EN-DC, UE is connected to eNB operating as MN and gNB operating as SN, eNB (ie, Master eNB) is connected to 5GC, and gNB (ie Secondary gNB) is connected via Xn interface. Is connected to Master eNB.
[0013]
　2, FIG. 3, and FIG. 4 show the network configurations of the three DC types described above, namely EN-DC, NE-DC, and NG-EN-DC, respectively. The Secondary gNB (SgNB) in EN-DC in FIG. 2 is also called en-gNB, and the Secondary eNB (SeNB) in NE-DC in FIG. 3 and the Master eNB (MeNB) in NG-EN-DC in FIG. 4 are , Also referred to as ng-eNB, but referred to herein as gNB or eNB. In addition, the 5G System supports dual connectivity between two gNBs. As used herein, the dual connectivity between the two gNBs is referred to as NR-NR DC. FIG. 5 shows the network configuration of the NR-NR DC.
[0014]
　NR is expected to use different radio parameter sets for multiple frequency bands. Each radio parameter set is called "numerology". OFDM numerology for Orthogonal Frequency Division Multiplexing (OFDM) systems includes, for example, subcarrier spacing, system bandwidth, Transmission Time Interval (TTI) length, and sub. Includes subframe duration, cyclic prefix length, and symbol duration. The 5G system provides various types of services with different service requirements, such as enhanced Mobile Broad Band (eMBB), Ultra Reliable and Low Latency Communication (URLLC), and multi-connection M2M communication (massive). Supports, including Machine Type Communication: mMTC). The choice of Numerology depends on the service requirements.
[0015]
　The UE and NR gNB of the 5G system support the aggregation of multiple NR carriers with different numbers. In 3GPP, aggregation of multiple NR carriers (or NR cells) with different numbers is low layer aggregation such as existing LTE Carrier Aggregation (CA) or high layer aggregation such as existing Dual Connectivity. It is being considered to be realized by (upper layer aggregation).
[0016]
　5G NR supports a wider channel bandwidths (eg, 100s of MHz) than that of LTE. One channel band (ie, BW Channel ) is a radio frequency band (RF bandwidth) that supports one NR carrier. The channel bandwidth is also called the system bandwidth. LTE supports channel bandwidths up to 20 MHz, while 5G NR supports channel bandwidths up to, for example, 500 MHz.
[0017]
　In order to efficiently support multiple 5G services, such as wideband services such as eMBB and narrowband services such as the Internet of Things (IoT), it is preferable to be able to multiplex these multiple services on a single channel band. .. In addition, if all 5G UEs must support transmission and reception over the entire channel bandwidth, this is the low cost and low power consumption of UEs for narrowband IoT services. May hinder. Therefore, 3GPP allows one or more bandwidth parts (BWPs) to be set within the carrier band (ie, channel band or system band) of each NR component carrier. Multiple BWPs in one NR channel band may be used for frequency division multiplexing (FDM) of different numeros (eg, subcarrier spacing (SCS)). The bandwidth part is also called a carrier bandwidth part.
[0018]
　One bandwidth part (BWP) is composed of frequency-consecutive and contiguous physical resource blocks (PRBs). The bandwidth of one BWP is at least as large as the synchronization signal (SS) / physical broadcast channel (PBCH) block bandwidth. The BWP may or may not include an SS / PBCH block (SSB). The BWP configuration includes, for example, numerology, frequency location, and bandwidth (the number of eg, PRBs). Common PRB indexing is used for the downlink (DL) BWP configuration at least in the Radio Resource Control (RRC) connected state to specify the frequency location. Specifically, the offset from PRB 0 to the lowest PRB of the SSB accessed by the UE is set by higher layer signaling. The reference point “PRB 0” is common to all UEs that share the same wideband component carrier.
[0019]
　One SS / PBCH block contains the basic signals required for idle UE, such as NR synchronization signals (NR-SS) and NR physical broadcast channel (NR-PBCH). NR-SS is used by the UE to get DL synchronization. A Reference Signal (RS) is sent in the SS / PBCH block to enable Radio Resource Management (RRM) measurement (eg, RSRP measurement) to the idle UE. The RS may be the NR-SS itself or an additional RS. The NR-PBCH broadcasts a portion of the minimum system information (minimum SI) (eg, Master Information Block (MIB)). The remaining minimum SI (remaining minimum SI (RMSI)) is transmitted via the Physical Downlink Shared Channel (PDSCH).
[0020]
　The network can transmit multiple SS / PBCH blocks within the channel bandwidth of one broadband component carrier. In other words, SS / PBCH blocks may be transmitted in multiple BWPs within the channel band. In the first plan, all SS / PBCH blocks in one broadband carrier correspond to the same physical-layer cell identity (NR-SS (eg, primary SS (PSS)) and secondary SS (SSS). ))based on. In the second option, different SS / PBCH blocks in one broadband carrier may be based on NR-SS corresponding to different physical-layer cell identifiers.
[0021]
　From the UE perspective, cells are associated with one SS / PBCH block. Therefore, for the UE, each serving cell has one associated SS / PBCH block (single associated SS / PBCH block) in frequency. Each serving cell is a carrier aggregation (CA) and dual connectivity (DC) primary cell (PCell), a DC primary secondary cell (PSCell), or a CA and DC secondary cell (SCell). Such an SSB is called a cell defining SS / PBCH block. The Cell defining SS / PBCH block has an associated RMSI. The Cell defining SS / PBCH block serves as a time reference or timing reference for the serving cell. Also, the Cell defining SS / PBCH block is used for SS / PBCH block (SSB) based RRM Measurements. Cell defining SS / PBCH block is "synchronous reconfiguration" for PCell / PSCell (eg, reconfiguration of radio resource configuration information without handover using RRC Reconfiguration procedure) and "SCell release /" for SCell. It can be changed by "add".
[0022]
　One or more BWP configurations for each component carrier are quasi-statically signaled to the UE. Specifically, for each UE-specific serving cell, one or more DL BWPs and one or more UL BWPs can be configured for the UE by a dedicated RRC message. In addition, one or more BWPs configured for the UE can be activated and deactivated. BWP activation / deactivation is determined not by the RRC layer but by the lower layers (eg, Medium Access Control (MAC) layer, Physical (PHY) layer). The activated BWP is called an activated BWP (active BWP).
[0023]
　The switching of the activated BWP (active BWP) may be performed by, for example, the Downlink Control Information (DCI) (eg, scheduling DCI) transmitted on the NR Physical Downlink Control Channel (PDCCH). In other words, the deactivation of the current active BWP and the activation of the new active BWP may be done by the DCI of the NR PDCCH. Thus, the network can activate / deactivate the BWP, eg, depending on the data rate or the numerology required by the service, and can dynamically switch the active BWP for the UE. BWP activation / deactivation may be performed by the MAC Control Element (CE).
[0024]
　6 and 7 show examples of using BWP. In the example shown in FIG. 6, the channel bandwidth of one component carrier is divided into BWP # 1 and BWP # 2, and these two BWPs are used for FDM with different numbers (eg, different subcarrier spacing). .. In the example shown in FIG. 7, a narrow band BWP # 1 is arranged in the channel band of one component carrier, and a narrow band BWP # 2 is further arranged in the channel band of one component carrier. When BWP # 1 or BWP # 2 is activated for a UE, the UE can reduce power consumption by not receiving and transmitting outside the active BWP (but within the channel bandwidth).
[0025]
　Non-Patent Documents 1 to 7 disclose the above-mentioned BWP and cell defining SS / PBCH block.
[0026]
　In addition, 3GPP is considering Radio Link Monitoring (RLM) requirements related to the use of BWPs (see Non-Patent Document 8). Note that the RLM procedure is a connected mode (ie) to measure the downlink radio quality of the serving cell for the purpose of detecting out of synchronization (out-of-sync) and radio link failure (RLF). , RRC_CONNECTED) Used by UE.
[0027]
　Non-Patent Document 8 discloses the following matters. NR supports RLM on PCell and PSCell only. UEs in Connected mode can set one or multiple BWPs per cell to quasi-statically. The UE can switch a specific BWP for communication with gNB between multiple configured BWPs. This switching is done on a short time scale, such as several scheduling intervals. This particular BWP is the active BWP. The UE can only access one BWP at a time. Active BWP has at least a Channel State Information Reference Signal (CSI-RS) configured for RLM. One of the CSI-RS and SS / PBCH blocks is set to be monitored at a time for RLM. Only one RS was selected for RLM and was selected, even if different types of RS (ie, CSI-RS and SS / PBCH block) were simultaneously (simultaneously) configured in one BWP. Parameters related to RS are used for RLM. It is being considered that the UE will keep the on-going L3 parameters for RLM when the DL active BWP is switched (or changed). In this case, the UE does not reset the L3 parameters for RLM to their default values ​​when the DL active BWP is switched.
[0028]
　Furthermore, Non-Patent Document 9 discloses the following matters in the case where SS / PBCH block (SSB) is monitored for RRM measurement (ie, SS / PBCH block (SSB) based RRM Measurements). In (SSB-based) Intra-frequency Measurement, the center frequency of the (cell defining) SSB of the serving cell and the center frequency of the (cell defining) SSB of the adjacent cell are the same, and the subcarrier spacing of these two SSBs. Is the measurement when is the same. On the other hand, in the (SSB-based) inter-frequency measurement, the center frequency of the (cell defining) SSB of the serving cell and the center frequency of the (cell defining) SSB of the adjacent cell are different, or the subcarrier spacing of these two SSBs (subcarrier). It is a measurement when the spacing) is different.
[0029]
　In addition, 3GPP is investigating the need for measurement gaps in radio frequency (RF) measurements (see Non-Patent Document 10). Non-Patent Document 10 discloses that the UE makes measurements outside its active BWP in the measurement gap.
[0030]
　In addition, 3GPP Release 14 and earlier include the following provisions regarding the measurement gap for inter-frequency measurement. Prior to 3GPP Release 13, for CA and DC, measurements with activated CCs are performed without measurement gaps. Whether a measurement gap is needed for Inter-frequency measurements and Inter-RAT measurements depends on UE capabilities (eg, whether the UE has multiple receivers). UE capability signaling is used to inform eNodeB of the need for measurement gaps for each supported and measured band.
[0031]
　In addition, with 3GPP Release 14, eNB can set the per-CC (per-serving cell) measurement gap to UE. The secondary cell (SCell) is activated or deactivated by the MAC Control Element (CE). However, PCell and PSCell are not changed by MAC CE. In situations where the PCell and PSCell are unchanged, the UE can measure CCs other than activated CC using the per-CC (per-CC) measurement gap set in the RRC Connection reconfiguration.
Prior art literature
Non-patent literature
[0032]
Non-Patent Document 1: 3GPP R1-1711795, Ericsson, “On bandwidth parts and“ RF ”requirements”, TSG RAN1 NR Ad-Hoc # 2, Qingdao, PR China, June 2017
Non-Patent Document 2: 3GPP R2-1707624, “ LS on Bandwidth Part Operation in NR ”, 3GPP TSG RAN WG2 # 99, Berlin, Germany, August 2017
Non-Patent Document 3: 3GPP R2-1710012,“ LS on Further agreements for Bandwidth part operation ”, 3GPP TSG RAN WG2 # 99bis, Prague, Czech Republic, October 2017
Non-Patent Document 4: 3GPP R2-1710031, “Reply LS on multiple SSBs within a wideband carrier”, 3GPP TSG RAN WG2 # 99bis, Prague, Czech Republic, October 2017
Non-Patent Document 5: 3GPP R2 -1711640, ZTE Corporation, Sane Chips, “Initial discussion on the impacts of BWP on RAN2”, 3GPP TSG-RAN WG2 Meeting # 99bis, Prague, Czech Republic, October 2017
Non-Patent Document 6: 3GPP R2-1711969, Ericsson, “Text Proposal for L1 parametrs for 38.331”, 3GPP TSG-RAN WG2 # 99bis, Prague, Czech Republic, October 2017
Non-Patent Document 7: 3GPP R2-1709861, “LS on multiple SSBs within a wideband carrier ”, 3GPP TSG RAN WG2 # 99, Berlin, Germany, August 2017
Non-Patent Document 8: 3GPP R2-1711404, Samsung,“ RLM / RLF for bandwidth part ”, 3GPP TSG RAN WG2 # 99bis, Prague , Czech Republic, October 2017
Non-Patent Document 9: 3GPP R2-1710051, “LS on scenarios of multiple SSB”, 3GPP TSG RAN WG2 # 99bis, Prague, Czech Republic, October 2017
Non-Patent Document 10: 3GPP R2-1711187, Samsung , “Framework to support bandwidth parts in NR”, 3GPP TSG RAN WG2 # 99bis, Prague, Czech Republic, October 2017
Outline of the invention
Problems to be solved by the invention
[0033]
　The present inventor examined in detail RF measurement (eg, RLM measurement, and CSI measurement) when multiple BWPs are set in one carrier band, and found some problems. For example, consider the case where the UE in the connected mode (eg, NR RRC_CONNECTED) monitors another BWP belonging to the same component carrier band (channel band) as the active BWP for RLM measurement, CSI measurement, and the like. In this case, it is considered that whether or not a measurement gap is necessary depends on UE Capabilities. However, when one carrier band includes a plurality of BWPs, there is a problem that it is not clear how the UE and gNB set the measurement gap for the measurement between these BWPs. One of the objectives to be achieved by the embodiments disclosed herein is to provide devices, methods, and programs that contribute to solving the problem. It should be noted that this object is only one of the purposes that the plurality of embodiments disclosed herein seek to achieve. Other objectives or issues and novel features will be apparent from the description or accompanying drawings herein.
Means to solve problems
[0034]
　In the first aspect, the wireless terminal comprises a memory and at least one processor coupled to the memory. The at least one processor provides an indication within a radio access network (RAN) to indicate the need for a measurement gap for measurement between BWPs contained in a plurality of downlink bandwidth parts (BWPs). RAN) Configured to send to the node. The plurality of downlink BWPs are included in one system band. The at least one processor is further configured to receive measurement settings from the RAN node, including measurement gap settings for one or more BWPs included in the plurality of downlink BWPs.
[0035]
　In a second aspect, the radio access network (RAN) node comprises a memory and at least one processor coupled to the memory. The at least one processor is configured to receive from a wireless terminal an indication indicating the necessity of a measurement gap for measurement between BWPs included in a plurality of downlink bandwidth parts (BWPs). The plurality of downlink BWPs are included in one system band. The at least one processor is further configured to transmit measurement settings to the radio terminal, including measurement gap settings for one or more BWPs included in the plurality of downlink BWPs.
[0036]
　In a third aspect, the method in a radio terminal provides an indication within a radio access network (RAN) indicating the need for a measurement gap for measurement between BWPs contained in a plurality of downlink bandwidth parts (BWPs). To transmit to the Radio Access Network (RAN) node, where the plurality of downlink BWPs are contained within one system band; and one or more of the BWPs included in the plurality of downlink BWPs. Includes receiving measurement settings from the RAN node, including measurement gap settings for.
[0037]
　In a fourth aspect, the method at a radio access network (RAN) node provides a radio terminal with an indication indicating the need for a measurement gap for measurement between BWPs contained in multiple downlink bandwidth parts (BWPs). Received from, where the plurality of downlink BWPs are contained within one system band; and measurements including measurement gap settings for one or more BWPs included in the plurality of downlink BWPs. Includes transmitting the settings to the wireless terminal.
[0038]
　In a fifth aspect, the program includes instructions (software code) for causing the computer to perform the method according to the third or fourth aspect described above when loaded into the computer.
The invention's effect
[0039]
　According to the above aspects, it is possible to provide a device, a method, and a program for enabling a wireless terminal to set an appropriate measurement gap for measurement between a plurality of BWPs in one carrier band.
A brief description of the drawing
[0040]
[Fig. 1] Fig. 1 shows the basic architecture of the 5G System.
[Fig. 2] Fig. 2 is a diagram showing a network configuration of EN-DC.
[Fig. 3] Fig. 3 is a diagram showing a network configuration of NE-DC.
[Fig. 4] Fig. 4 is a diagram showing a network configuration of NG-EN-DC.
[Fig. 5] Fig. 5 is a diagram showing a network configuration of NR-NR DC.
[Fig. 6] Fig. 6 is a diagram showing a usage example of Bandwidth part (BWP).
[Fig. 7] Fig. 7 is a diagram showing a usage example of Bandwidth part (BWP).
FIG. 8 is a diagram showing a setting example of BWP and SS / PBCH block.
[Fig. 9] Fig. 9 is a diagram showing a setting example of BWP and SS / PBCH block.
FIG. 10 is a diagram showing a configuration example of a wireless communication network according to some embodiments.
FIG. 11 is a flowchart showing an example of the operation of the wireless terminal according to the first embodiment.
FIG. 12 is a flowchart showing an example of the operation of the RAN node according to the first embodiment.
[Fig. 13A] It is a figure which shows the use example of a Bandwidth part (BWP).
[Fig. 13B] It is a figure which shows the use example of a Bandwidth part (BWP).
[Fig. 13C] It is a figure which shows the use example of Bandwidth part (BWP).
FIG. 14A illustrates an example of signaling indicating the need for measurement gaps.
FIG. 14B is a diagram illustrating an example of signaling indicating the need for measurement gaps.
FIG. 14C is a diagram illustrating an example of signaling indicating the need for measurement gaps.
FIG. 15A is a diagram illustrating an example of signaling indicating the need for measurement gaps.
FIG. 15B is a diagram illustrating an example of signaling indicating the need for measurement gaps.
FIG. 15C is a diagram illustrating an example of signaling indicating the need for measurement gaps.
FIG. 16 is a sequence diagram showing an example of the operation of the RAN node and the wireless terminal according to the second embodiment.
FIG. 17 is a sequence diagram showing an example of the operation of the RAN node and the wireless terminal according to the third embodiment.
FIG. 18 is a sequence diagram showing an example of the operation of the RAN node and the wireless terminal according to the fourth embodiment.
FIG. 19 is a block diagram showing a configuration example of a RAN node according to some embodiments.
FIG. 20 is a block diagram showing a configuration example of a wireless terminal according to some embodiments.
Mode for carrying out the invention
[0041]
　Hereinafter, specific embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are designated by the same reference numerals, and duplicate explanations are omitted as necessary for the sake of clarification of the explanations.
[0042]
　The plurality of embodiments described below may be implemented independently or in combination as appropriate. These plurality of embodiments have novel features that differ from each other. Therefore, these plurality of embodiments contribute to solving different purposes or problems, and contribute to different effects.
[0043]
　The plurality of embodiments shown below will be described with the 3GPP 5G system as the main subject. However, these embodiments may be applied to other wireless communication systems.
[0044]
　First, the definitions of terms relating to the case where one system band contains a plurality of BWPs will be described with reference to FIGS. 8 and 9. 8 and 9 show a setting example of BWP and SS / PBCH block. In the examples shown in FIGS. 8 and 9, one channel band contains three BWPs, namely BWP # 1, BWP # 2, and BWP # 3. BWP # 1 and BWP # 2 contain SS / PBCH block (SSB) # 1 and SSB # 2, respectively, while BWP # 3 does not contain SS / PBCH block.
[0045]
　From a network perspective, the entire bandwidth (ie, channel bandwidth or system bandwidth) of one component carrier corresponds to one cell, similar to existing LTE. In the examples of FIGS. 8 and 9, the Physical Cell Identity (PCI) associated with the cell corresponding to the channel bandwidth is "PCIx".
[0046]
　In the present specification, a cell from a network perspective is defined as a “logical cell”. Furthermore, the PCI associated with the network viewpoint cell (ie, logical cell) is defined as the reference PCI. The network viewpoint cell (ie, logical cell) may be associated with one Cell Identity. In this case, the Cell Identity of the network viewpoint cell (ie, logical cell) may be associated with the (sub) PCIs of a plurality of physical cells described later.
[0047]
　On the other hand, as already described, in the UE perspective, cells are associated with one SS / PBCH block. In the present specification, a cell from the viewpoint of UE is defined as a “physical cell”. Furthermore, the PCI associated with the UE viewpoint cell (ie, physical cell) is defined as a sub-PCI. That is, a plurality of BWPs included in one system band and each containing an SS / PBCH block are a plurality of UE viewpoint cells (ie, a plurality of physical cells). The sub-PCIs of these plurality of UE viewpoint cells (physical cells) are associated with one reference PCI or one Cell Identity of the network viewpoint cell (ie, logical cell). In addition, a BWP that does not contain an SS / PBCH block may be defined as a UE viewpoint cell (physical cell), or a group of BWPs that do not contain an SS / PBCH block and a BWP that contains an SS / PBCH block referenced by it is UE. It may be defined as a viewpoint cell (physical cell). From a network perspective, the unit system bandwidth actually used by the network (eg, RAN node) for communication with the UE is each UE perspective cell (physical cell).
[0048]
　In the example of FIG. 8, three BWPs support the same numerology (ie, numerology # 1), and all SS / PBCH blocks (ie, SSB # 1 and SSB # 2) in one channel band are the same. (Sub) Based on NR-SS corresponding to PCI (ie, PCIx). That is, FIG. 8 corresponds to the first proposal described above with respect to the transmission of multiple SS / PBCH blocks within the channel band. In order for the UE to synchronize with BWP # 3 that does not include SSB, SSB # 1 or SSB # 2 transmitted by other BWPs is referenced. At this time, the referenced SSB # 1 or SSB # 2 may be referred to as a reference SSB (reference SSB), and the UE may be notified of the reference SSB identifier (SSB index, eg, SSB # 1 or # 2) from the network. ..
[0049]
　In the example of FIG. 9, BWP # 1 supports numerology # 1 and BWP # 2 and BWP # 3 support numerology # 2. Different SSBs # 1 and # 2 for different numeros are based on NR-SS corresponding to different (sub) PCIs (ie, PCIx and PCI). That is, FIG. 9 corresponds to the second proposal described above with respect to the transmission of multiple SS / PBCH blocks within the channel band. In order for the UE to synchronize to BWP # 3, which does not include SSB, for example, SSB # 2 of BWP # 2, which supports the same numerology as BWP # 3, is referenced. Alternatively, in order for the UE to synchronize to BWP # 3, which does not include SSB, the UE may refer to SSB # 1 of BWP # 1, which supports numerology different from that of BWP # 3.
[0050]
　In the example of FIG. 8, the reference PCI (ie, PCIx) or Cell Identity of one network viewpoint cell (ie, logical cell) has the sub-PCIs (ie, PCIx and PCIx) of two UE viewpoint cells (physical cells). Be associated. In the example of FIG. 9, the reference PCI (ie, PCIx) or Cell Identity of one network viewpoint cell (ie, logical cell) has the sub-PCIs (ie, PCIx and PCIy) of two UE viewpoint cells (physical cells). Be associated.
[0051]
　The network (eg, RAN node) may set the UE to a BWP set containing one or more BWPs. In other words, the UE receives one or more BWPs configuration information (eg, SSB indexes, presence of SSBs, reference SSB indexes, Layer-1 parameters) from the network. BWP sets may be individually configured for downlink (DL) and uplink (UL). That is, the BWP set may include a separate DL BWP set and UL BWP set for DL ​​and UL. Alternatively, the UL BWP and DL BWP may be associated in advance, and the BWP set in this case may be common to DL and UL. The UE can activate k (k <= K) of the K BWPs included in the (DL / UL) BWP set. In other words, up to K (DL / UL) BWP (s) can be activated at one time for a UE. In the following description, it is assumed that one BWP (ie k = 1) is activated for simplification. However, this embodiment and subsequent embodiments can be appropriately applied even when two or more (k> = 2) BWPs are activated at one time.
[0052]
　In addition, the specification introduces the term "BWP group". BWP groups are included in the BWP set. The BWP group consists of one or more BWPs whose active BWP can be modified by the DCI transmitted on the NR PDCCH. Between one or more BWPs in the BWP group, the active BWP can be changed without changing the Cell defining SSB. Therefore, a BWP group may be defined as one or more BWPs associated with one cell defining SSB. One BWP group may include one BWP (eg, reference BWP, initial BWP, default BWP) containing the cell defining SSB and one or more other BWPs. Each of the other one or more BWPs that is not the reference BWP (or initial BWP, default BWP) may or may not contain SSB. The UE may explicitly specify and set which SSB is the cell defining SSB, and implicitly states that the SSB of the first BWP when the UE is configured the BWP group is the cell defining SSB ( You may think implicitly).
[0053]
　BWP groups may be individually configured for downlink (DL) and uplink (UL). That is, the BWP group may include a separate DL BWP group and UL BWP group in DL and UL. Alternatively, UL BWP and DL BWP may be associated in advance, and the BWP group in this case may be common to DL and UL.
[0054]
　In the example of FIG. 8, BWP # 1 to # 3 are set in the UE as one BWP set. In the example of FIG. 8, the UE may refer to SSB # 1 transmitted by BWP # 1 in order to synchronize with BWP # 3 (that is, to establish synchronization in BWP # 3). In this case, BWP # 1 and BWP # 3 may correspond to one BWP group, and BWP # 2 may correspond to another BWP group. That is, one BWP set (BWPs # 1, # 2, and # 3) may include a first BWP group (BWPs # 1 and # 3) and a second BWP group (BWP # 2). Alternatively, one BWP set (BWPs # 1, # 2, and # 3) may include a first BWP group (BWP # 1) and a second BWP group (BWPs # 2 and # 3). good. Further, instead of this, one BWP set (BWPs # 1, # 2, and # 3) may correspond to one BWP group (BWPs # 1, # 2, and # 3). In this case, one of SSB # 1 and SSB # 2 is the cell defining SSB for the UE.
[0055]
　Also in the example of FIG. 9, BWP # 1 to # 3 are set in the UE as one BWP set. In one example, BWP # 1 of numerology # 1 may correspond to one BWP group, and BWP # 2 and BWP # 3 of numerology # 2 may correspond to another BWP group. That is, one BWP set (BWPs # 1, # 2, and # 3) may include a first BWP group (BWPs # 1) and a second BWP group (BWP # 2 and # 3). As described above, BWPs of different numbers may be included in one BWP group. Therefore, in another example, one BWP set (BWPs # 1, # 2, and # 3) can be a first BWP group (BWPs # 1 and # 3) and a second BWP group (BWP # 2). It may be included. Further, instead of this, one BWP set (BWPs # 1, # 2, and # 3) may correspond to one BWP group (BWPs # 1, # 2, and # 3). In this case, one of SSB # 1 and SSB # 2 is the cell defining SSB for the UE.
[0056]
　As described above, activation / deactivation of BWP may be performed by a lower layer (eg, Medium Access Control (MAC) layer, Physical (PHY) layer) instead of the RRC layer. A timer (eg MAC layer BWP Inactivity Timer) may be used to activate / deactivate DL BWP. The UE may switch the active BWP according to a timer based on the set value sent by gNB. The period indicated by the timer may be indicated in subframe units. For example, if the UE does not send or receive data for a specified period (that is, timer expiration value) in the active BWP, change the active BWP of the specified BWP (BWP including eg, default BWP, cell defininig SSB). You may do so. The network (eg, RAN node) may also make a judgment on the active BWP change based on the same timer.
[0057]

　FIG. 10 shows a configuration example of a wireless communication network according to some embodiments including the present embodiment. In the example of FIG. 10, the wireless communication network includes a RAN node 11 and a wireless terminal (UE) 12. The RAN node 11 is, for example, gNB or eNB in ​​MR-DC. The RAN node 11 may be a Central Unit (CU) (eg, gNB-CU) in a cloud RAN (C-RAN) deployment, or a Distributed Unit (DU) (eg, gNB-DU). May be good. The Central Unit (CU) is also called the Baseband Unit (BBU) or digital unit (DU). The Distributed Unit (DU) is also referred to as the Radio Unit (RU), Remote Radio Head (RRH), Remote Radio Equipment (RRE), or Transmission and Reception Point (TRP or TRxP).
[0058]
　The UE 12 is connected to the RAN node 11 via the air interface 1001. The UE 12 may be connected to a plurality of RAN nodes at the same time for dual connectivity. UE12 of the Connected mod can set one or multiple BWPs per cell to quasi-statically. The UE 12 can switch the active BWP for communication with the RAN node 11 (eg, MgNB) or another RAN node (eg, SgNB) among a plurality of set BWPs. This switching is done on a short time scale, for example, several scheduling intervals.
[0059]
　UE12 executes the RLM procedure when in connected mode (eg, NR RRC_CONNECTED). In the RLM procedure, UE12 makes RLM measurements. In other words, the UE 12 measures the downlink radio quality of the serving cell for the purpose of detecting out of synchronization (out-of-sync) and radio link failure (RLF). The UE 12 may be connected to a plurality of RAN nodes at the same time for dual connectivity. In this case, UE12 may simultaneously perform RLM in PCell and RLM in PSCell.
[0060]
　The UE 12 may also perform CSI measurements when in connected mode (eg, NR RRC_CONNECTED). The CSI measurement sends a report to RAN node 11 containing the Channel Quality Indicator (CQI) used for at least one of scheduling and link adaptation when UE12 is in connected mode (eg, NR RRC_CONNECTED). The purpose includes measuring the DL radio quality of the serving cell. The UE 12 may be connected to a plurality of RAN nodes at the same time for dual connectivity. In this case, the UE 12 may simultaneously perform the CSI measurement with the MCG and the CSI measurement with the SCG.
[0061]
　Furthermore, the UE 12 may perform RRM measurements when in connected mode (eg, NR RRC_CONNECTED). For example, in the RRM measurement in the connected mode, the UE 12 measures the RSRP and RSRQ of the serving cell and the adjacent cell, and transmits an RRM report event for triggering the handover to the RAN node 11.
[0062]
　Each BWP has at least a CSI-RS that can be used for RLM, RRM, and CSI measurements. Active BWP may or may not include an SS / PBCH block (SSB). One of the CSI-RS and SS / PBCH blocks is set to be monitored at a time for RLM. Only one RS was selected for RLM and was selected, even if different types of RS (ie, CSI-RS and SS / PBCH block) were simultaneously (simultaneously) configured in one BWP. Parameters related to RS are used for RLM.
[0063]
　The RAN node 11 supplies the measurement settings to the UE 12. The measurement setting relates to RF measurements made by UE12. RF measurements include at least one of RLM, CSI, and RRM measurements. Therefore, the measurement setting includes at least one of the RLM measurement setting, the CSI measurement setting, and the RRM measurement setting.
[0064]
　RLM measurement settings may be referred to as RLF-related settings. The RLM measurement settings include, for example, parameters for RLM. The parameters for RLM include, for example, a predetermined number of out-of-sync, a predetermined number of in-sync, and the expiration period (maximum time) of the RLF timer. A given number of out-of-syncs is a consistent “out-of-sync” display received from the lower layers before the UE initiates the wireless link self-recovery process. The number of indications. A predetermined number of in-syncs is the number of consecutive "in synchronization" indications received from the lower layers before the UE determines that the radio link has been recovered. The RLF timer is used to determine (or detect) RLF. The UE starts the RLF timer when it receives a predetermined number of continuous out-of-sync displays, and stops the RLF timer when it receives a predetermined number of continuous in-sync displays. The expiration period (maximum time) of the RLF timer corresponds to the maximum time allowed for wireless link recovery dynamically performed by the UE. In response to the expiration of the RLF timer, the UE detects the RLF.
[0065]
　The CSI measurement setting indicates, for example, the subframe set in which the CSI measurement should be performed.
[0066]
　The RRM measurement settings include, for example, the RRM reporting configuration (ReportConfig). The RRM reporting setting indicates the parameters (eg, threshold and / or offset) used for each determination of one or more RRM reporting events. As an example, the RRM reporting event for BWPs may be that the BWP of the adjacent cell is better than the amount of offset compared to the active BWP of the serving cell (PCell / PSCell). RRM reporting events for BWPs may be defined by modifying existing reporting events for handovers, CAs, and DCs (eg, events A1-A6, and C1 and C2).
[0067]
　For example, an RRM reporting event for BWPs may be defined by replacing "Serving" in an existing reporting event with "active BWP" (or "default BWP"). In addition, RRM reporting events for BWPs may be defined by replacing "Neighbour" in existing reporting events with "BWP" (configured with MeasObject). RRM reporting events for BWPs may include: -Event
D1: Serving BWP becomes better than absolute threshold; -Event
D2: Serving BWP becomes worse than absolute threshold;
-Event D3: Neighbor BWP becomes amount of offset better than Primary. BWP (or ・ default BWP);
・ Event D4: Neighborhood BWP becomes better than absolute threshold;
・ Event D5: Primary BWP (or default BWP) becomes worse than absolute threshold1 AND Neighborhood BWP becomes better than another absolute threshold2;
・ Event D6: Neighborhood BWP becomes amount of offset better than Secondary BWP.
[0068]
　The cell list (eg, cellToAddModList) specified for measurement in MeasObject includes the identifier (eg, Cell Index, PCI) of the target cell. However, BWPs that do not contain SSBs do not have their own (sub) PCI. Therefore, instead of the measurement for BWP that does not contain SSB, the measurement for cell defining SSB may be performed. Alternatively, in order to specify a BWP that does not contain SSB, the PCI of the BWP that contains the cell defining SSB associated with the BWP (that is, the PCI specified by the cell defining SSB), or the virtual PCI (eg, virtual PCI). ) May be assigned to this, or the BWP index may be used as an alternative identifier.
[0069]
　The UE 12 can set one or more DL BWPs included in one component carrier band (ie, system band or channel band) by the RAN node 11. UE12 treats the measurement between BWPs in the system band (inter-BWP measurement) as the inter-frequency measurement. The measurement may be an RLM measurement or an RRM measurement within the BWP set or BWP group corresponding to the serving cell (physical cell) of the UE viewpoint set in the UE 12. Further or instead, the measurement is performed on one of the BWPs in the BWP set corresponding to the UE viewpoint serving cell (physical cell) set in UE12 and the BWP (s) outside the BWP set (that is, within the system band). It may be an RRM measurement with a BWP (s) corresponding to an adjacent cell (physical cell) of. The setting for measuring BWP (s) outside the BWP set only needs to include at least the information necessary for measurement (eg, RRM measurement), and information about normal BWP (eg UE stays). It is not necessary to include the necessary BWP setting information). The term measurement BWP set may be defined to collectively refer to those BWPs (and BWP sets).
[0070]
　FIG. 11 is a flowchart showing an example (process 1100) of the operation performed by the UE 12. In step 1101, the UE 12 transmits an indication indicating the necessity of the measurement gap to the RAN node 11. The indication indicates the necessity of a measurement gap for measurement between BWPs contained in a plurality of DL BWPs (that is, between DL BWPs in which at least one of frequency and numerology is different). In step 1102, the UE 12 receives a measurement setting (eg, RRM measurement setting) including a measurement gap setting for measuring one or more BWPs included in the plurality of DL BWPs from the RAN node 11.
[0071]
　Measurement gaps are the time periods during which UE uplinks and downlink transmissions are not scheduled, so that the UE can make measurements. In other words, measurement gaps define how long the UE may use for measurements.
[0072]
　FIG. 12 is a flowchart showing an example of the operation of the RAN node 11 (process 1200). In step 1201, the RAN node 11 receives from the UE 12 an indication indicating the necessity of a measurement gap for measurement between the BWPs included in the plurality of DL BWPs. In step 1202, the RAN node 11 transmits to the UE 12 a measurement setting including a measurement gap setting for measuring one or more BWPs contained in these plurality of DL BWPs.
[0073]
　In some implementations, the indication indicating the need for a measurement gap for measurement between BWPs is a measurement of one or more of the DL BWPs that differ from the BWP activated for UE12. May indicate whether the UE 12 requires a measurement gap for the purpose. The BWP activated for UE12 is the BWP corresponding to the serving cell (physical cell). In other words, the indication is whether one BWP is activated for the UE 12 and the UE 12 requires a measurement gap for the measurement of another BWP (s) different from the active BWP. May be indicated. For example, the indication may indicate that if BWP # 1 is activated for UE12, a measurement gap is required for the measurement of at least one of BWP # 2 and BWP # 3. Here, BWP # 1, BWP # 2, and BWP # 3 are included in one component carrier band (ie, system band or channel band).
[0074]
　In some implementations, the indication indicating the need for a measurement gap for measurement between BWPs refers to one or more of the DL BWPs that differ from the BWP activated for UE12. It may be indicated for each BWP whether the UE 12 requires a measurement gap. In other words, the indication indicates whether UE12 requires a measurement gap for the measurement of a particular BWP (s) that is different from the BWP activated for UE12 among multiple DL BWPs. May be good. For example, the indication requires a measurement gap for the measurement of BWP # 2 when BWP # 1 is activated for UE12, while no measurement gap is required for the measurement of BWP # 3. It may be shown that.
[0075]
　In some implementations, the indication indicating the need for measurement gaps for measurements between BWPs is information about all BWP pairs contained in multiple DL BWPs (or specific BWP pairs specified by the RAN node). May include. More specifically, the indication requires a measurement gap in which UE12 needs a measurement gap to measure the other BWP in each BWP pair when one BWP in each BWP pair is activated for UE12. It may indicate whether or not. Further, this method may be applied to a combination of three or more BWPs contained in a plurality of DL BWPs (BWP combination (BwC)). For example, whether or not UE12 requires a measurement gap for each measurement of the remaining BWP (s) of each BWP combination when one BWP of each BWP combination is activated for UE12. May be shown.
[0076]
　The measurement gap setting (which is sent from RAN node 11 to UE12) is one or more different from the active BWP when one of these multiple DL BWPs is activated for UE12. The setting regarding the measurement gap for UE12 to measure BWPs of is shown. The measurement gap setting indicates, for example, the presence or absence of a measurement gap, the length of the measurement gap, and at least one of the measurement gap patterns. For example, the measurement gap setting may indicate the presence or absence of a measurement gap when BWP # 1 is activated for UE12. If a measurement gap for BWP # 1 is set, UE12 may perform at least one measurement of BWP # 2 and BWP # 3 in that measurement gap.
[0077]
　UE12 indicates the necessity of a measurement gap for measurement between BWPs, depending on the RF receiver configuration of UE12 and the number of BWPs configured at the same time (in other words, the number of BWPs included in the configured BWP group). The display may be determined. Specifically, the UE 12 may consider the number of RF receivers provided in the UE 12 to generate the display. RF receivers are also called RF chains.
[0078]
　In the following, with reference to FIGS. 13A-13C, 14A-14C, and 15A-15C, a display indicating the necessity of a measurement gap for measurement between BWPs (which is sent from UE 12 to RAN node 11). ) Are explained. Here, as an example, consider the case where UE12 has two RF chains (ie, RF chain # 1 and RF chain # 2). Further, here, it is assumed that the band covered by each RF chain of the UE 12 (also referred to as the RF band) is larger than the band of one BWP but smaller than the total of the bands of the two BWPs. Therefore, when measuring a plurality of BWPs using one RF chain, the UE 12 needs to receive signals in order at each BWP while appropriately switching RF (frequency) in the RF chain.
[0079]
　13A-13C show three examples of one or more BWPs (ie BWP sets) set within one component carrier band. In the example of FIG. 13A, three BWP groups are set in one component carrier band (channel band or system band). Each BWP group consists of one BWP. That is, BWP # 1, BWP # 2, and BWP # 3 shown in FIG. 13A include SSB # 1, SSB # 2, and SSB # 3, respectively. According to the definition of terms herein, the example of FIG. 13A includes one network viewpoint cell (ie, logical cell) containing three UE viewpoint cells (ie, physical cell). Switching active BWP between these three BWPs (ie, three physical cells) corresponds to switching active BWP between BWP groups (ie, physical cells) and therefore RRC signaling (eg, RRC Reconfiguration). Message). For example, the UE 12 sequentially receives signals on BWP # 1 and BWP # 2 by RF chain # 1, and receives signals on BWP # 3 by RF chain # 2.
[0080]
　In the example of FIG. 13B, two BWP groups are set in one component carrier band (channel band or system band). One of these two BWP groups contains BWP # 1 and BWP # 2, and the other contains BWP # 3. BWP # 1 and BWP # 2 are associated with (cell defining) SSB # 1 within BWP # 1. BWP # 3 is associated with (cell defining) SSB # 3 within BWP # 3. According to the definition of terms herein, in the example of FIG. 13B, one logical cell contains two physical cells. Switching active BWP between BWP # 1 and BWP # 2 is equivalent to switching active BWP within one BWP group (ie, one physical cell) and therefore sends in PDCCH / DCI, or NR PDCCH. It is done by DCI. On the other hand, switching active BWP between BWP # 1 and BWP # 3 and between BWP # 2 and BWP # 3 is equivalent to switching active BWP between BWP groups (ie, between physical cells), and therefore. It is done by RRC signaling (eg, RRC Reconfiguration message). For example, the UE 12 sequentially receives signals on BWP # 1 and BWP # 2 by RF chain # 1, and receives signals on BWP # 3 by RF chain # 2.
[0081]
　In the example of FIG. 13C, one BWP group is set in one component carrier band (channel band or system band). This BWP group includes BWP # 1, BWP # 2, and BWP # 3. These three BWPs are associated with (cell defining) SSB # 1 within BWP # 1. According to the definition of terms herein, in the example of FIG. 13C, one logical cell contains one physical cell. Switching active BWP between these three BWPs (ie, three physical cells) corresponds to switching active BWP within one BWP group (ie, one physical cell), and thus by PDCCH / DCI. Will be done. For example, UE12 receives a signal at BWP # 1 by RF chain # 1, and sequentially receives a signal at BWP # 2 and BWP # 3 by RF chain # 2.
[0082]
　14A-14C show an example of the indication of the necessity of the measurement gap by the UE 12. In the example of FIGS. 14A-14C, UE12 creates a measurement gap for measurement between BWPs for one or more of these three DL BWPs that differ from the BWP activated for UE12. Notify the RAN node 11 whether it is needed or not.
[0083]
　FIG. 14A corresponds to the BWP setting of FIG. 13A. UE12 requires a measurement gap for the measurement of BWP # 2 when the active BWP is BWP # 1, and a display indicating that no measurement gap is required for the measurement of BWP # 3 RAN node 11 Send to. UE12 requires a measurement gap for the measurement of BWP # 1 when the active BWP is BWP # 2, and a display indicating that no measurement gap is required for the measurement of BWP # 3 RAN node 11 Send to. When the active BWP is BWP # 3, the UE 12 transmits a display to the RAN node 11 indicating that a measurement gap is not required for the measurement of BWP # 1 and BWP # 2.
[0084]
　FIG. 14B corresponds to the BWP setting of FIG. 13B. In the case of FIG. 14B, the UE 12 transmits to the RAN node 11 a display regarding the necessity of the measurement gap similar to that in the case of FIG. 14A.
[0085]
　FIG. 14C corresponds to the BWP setting of FIG. 13C. When the active BWP is BWP # 1, the UE 12 transmits a display to the RAN node 11 indicating that a measurement gap is not required for the measurement of BWP # 2 and BWP # 3. UE12 requires a measurement gap for the measurement of BWP # 3 when the active BWP is BWP # 2, and RAN node 11 indicates that no measurement gap is required for the measurement of BWP # 1. Send to. UE12 requires a measurement gap to measure BWP # 2 when the active BWP is BWP # 3, and RAN node 11 indicates that no measurement gap is needed to measure BWP # 1. Send to.
[0086]
　15A-15C show another example of indicating the necessity of the measurement gap by the UE 12. In the example of FIGS. 15A-15C, the UE 12 sends information about the three BWP pairs contained in these three DL BWPs to the RAN node 11. More specifically, does UE12 require a measurement gap for the measurement of the other BWP of each BWP pair when one BWP of each BWP pair is activated for UE12? Notify the RAN node 11 of whether or not.
[0087]
　FIG. 15A corresponds to the BWP setting of FIG. 13A. The UE 12 sends a display to the RAN node 11 indicating that a measurement gap is required for the pair of BWP # 1 and BWP # 2. The indication states that when one of BWP # 1 and BWP # 2 (eg, BWP # 1) is an active BWP, a measurement gap is required to measure the other (eg, BWP # 2). means. The UE 12 transmits a display to the RAN node 11 indicating that no measurement gap is required for the pair of BWP # 1 and BWP # 3. The indication indicates that when one of BWP # 1 and BWP # 3 (eg, BWP # 1) is active BWP, no measurement gap is required to measure the other (eg, BWP # 3). means. Similarly, the UE 12 transmits a display to the RAN node 11 indicating that no measurement gap is required for the pair of BWP # 2 and BWP # 3.
[0088]
　FIG. 15B corresponds to the BWP setting of FIG. 13B. In the case of FIG. 15B, the UE 12 transmits to the RAN node 11 a display regarding the necessity of the measurement gap similar to that in the case of FIG. 15A.
[0089]
　FIG. 15C corresponds to the BWP setting of FIG. 13C. The UE 12 transmits a display to the RAN node 11 indicating that no measurement gap is required for the pair of BWP # 1 and BWP # 2. Similarly, the UE 12 transmits a display to the RAN node 11 indicating that no measurement gap is required for the pair of BWP # 1 and BWP # 3. On the other hand, the UE 12 transmits a display to the RAN node 11 indicating that a measurement gap is required for the pair of BWP # 2 and BWP # 3.
[0090]
　The RAN node 11 may transmit the measurement gap setting determined in consideration of the necessity of the measurement gap in the UE 12 to the UE 12. Specifically, for example, the RAN node 11 is between BWP # 1 and BWP # 2 when BWP # 1 is an active BWP in response to receiving the information shown in FIG. 14A from UE12. The measurement gap for measurement may be set to UE12. Further, the RAN node 11 may operate so that the measurement gap for measurement between BWP # 1 and BWP # 2 when BWP # 1 is active BWP is not set in UE12.
[0091]
　Note that the above description using FIGS. 13A-13C, 14A-14C, and 15A-15C is for simplification when the UE 12 has two RF chains and one system band contains three BWPs. Was explained as an example. However, the above description states that UE12 keeps only one RF chain, UE12 has at least three RF chains, one system bandwidth contains two BWPs, and one system bandwidth is at least four. Of course, it can be applied even when two BWPs are included.
[0092]
　As can be understood from the above description, the RAN node 11 and the UE 12 operate as follows when one carrier band includes a plurality of BWPs. The UE 12 transmits to the RAN node 11 an indication indicating the necessity of a measurement gap for measurement between BWPs included in a plurality of DL BWPs in one carrier band. Further, the UE 12 receives a measurement setting from the RAN node 11 including a measurement gap setting for one or more BWPs included in the plurality of DL BWPs. On the other hand, the RAN node 11 receives the display regarding the necessity of the measurement gap from the UE 12, and transmits the measurement setting including the measurement gap setting to the UE 12. Therefore, the RAN node 11 can know whether the UE 12 requires a measurement gap for measurement between a plurality of DL BWPs in one carrier band. Further, the RAN node 11 can send the measurement gap setting determined in consideration of the necessity of the measurement gap of the UE 12 to the UE 12. Therefore, the RAN node 11 and the UE 12 can set an appropriate measurement gap in the UE 12 for the measurement between a plurality of BWPs in one carrier band.
[0093]
In
　this embodiment, the sequence (procedure) in which the UE 12 sends a display indicating for each BWP whether or not the UE 12 requires a measurement gap to the RAN node 11 described in the first embodiment. To provide a concrete example of. The configuration example of the wireless communication network according to the present embodiment is the same as the example shown in FIG.
[0094]
　FIG. 16 is a sequence diagram showing an example (process 1600) of the operation of the RAN node 11 and the UE 12 according to the present embodiment. In step 1601, the UE 12 transmits UE NR radio capability information to the RAN node 11 (eg, gNB). UE NR radio capability information indicates that a measurement gap is required for inter-frequency (inter-BWP) measurement, and UE12 indicates the necessity of measurement gap for each BWP (per-BWP Gap Indication). Contains information indicating that it supports. The transmission of UE NR radio capability information may be performed using the UE Capability Information message.
[0095]
　In step 1602, the RAN node 11 transmits the BWP configuration (BWP configuration) and the (per UE) measurement gap setting (eg, MeasGapConfig) for each UE to the UE 12. The RAN node 11 further transmits a request to the UE 12 to transmit a display indicating the necessity of the measurement gap for each BWP. The information element (IE) corresponding to the request may be “PerBWP-GapIndicationRequest” IE. These settings and requests may be transmitted using RRC Reconfiguration messages.
[0096]
　The UE 12 executes the necessary internal settings according to the received BWP configuration, and sets the (per UE) measurement gap for each UE according to the setting of the (per UE) measurement gap for each received UE (MeasGapConfig).
[0097]
　In step 1603, the UE 12 transmits to the RAN node 11 a display indicating the necessity of the measurement gap for each BWP in the BWP set specified by the BWP configuration. The information element (IE) corresponding to the display may be “PerBWP-GapIndicationList” IE. The transmission of the display may be performed using the RRC Reconfiguration Complete message.
[0098]
　In step 1604, the RAN node 11 responds to (according to) the received display (perBWP-GapIndication) and transmits the measurement gap setting for each BWP to the UE 12. The setting of the measurement gap for each BWP may be "BWP specific measurement gap configuration". The information element (IE) corresponding to the setting of the measurement gap for each BWP may be “measGapConfigPerBWP” IE or “measGapConfigPerBWP-List” IE.
[0099]
　According to the sequence described in this embodiment, the RAN node 11 and the UE 12 can set the measurement gap for each BWP to the UE 12.
[0100]
The
　present embodiment provides a method of measurement setting for coping with switching of active BWP among a plurality of BWPs included in one BWP group. The configuration example of the wireless communication network according to the present embodiment is the same as the example shown in FIG.
[0101]
　In the present embodiment, the RAN node 11 copes with the switching of the active BWP (without changing the cell defining SSB) among the plurality of DL BWPs included in one DL BWP group. When each of the BWPs is an active BWP, a plurality of corresponding measurement settings are supplied to the UE 12 in advance by RRC signaling (eg, RRC Reconfiguration message). UE12 selects one of the multiple measurement settings received in advance corresponding to active BWP according to the active BWP for communication between UE12 and RAN being switched between BWPs in the BWP group. Select and use.
[0102]
　For example, if one BWP group contains the first and second BWPs, the RAN node 11 will have the first measurement setting used when the first BWP is the active BWP and the second BWP being the active BWP. The second measurement setting used when is supplied to UE12 by RRC signaling (eg, RRC Reconfiguration message). UE12 selects the first measurement setting when the active BWP is the first BWP and uses it for measurements (eg, RLM measurement, RRM measurement, CSI measurement). Further, the UE 12 autonomously switches the measurement setting from the first measurement setting to the second measurement setting in response to the active BWP being switched from the first BWP to the second BWP. The UE 12 then uses the second measurement setting corresponding to the active BWP after switching for the measurement.
[0103]
　As described above, switching of active BWP within a BWP group can be performed by lower layer signaling, eg DCI over NR PDCCH, without using RRC signaling. Switching active BWP within a BWP group can be rephrased as switching active BWP without changing the cell defining SSB. That is, the RAN nodes 11 and UE12 of the present embodiment do not require RRC signaling for updating the measurement settings when switching the active BWP within the BWP group. Therefore, the RAN nodes 11 and UE12 of the present embodiment can quickly switch the measurement settings in response to the switching of the active BWP in the BWP group, and the measurement according to the measurement settings corresponding to the active BWP after the switching. The operation can be started quickly.
[0104]
　The plurality of measurement settings previously supplied by the RAN node 11 to the UE 12 may include the measurement gap settings described in the first embodiment. Further or instead, the plurality of measurement settings pre-supplied by the RAN node 11 to the UE 12 may include other measurement settings that are different from the measurement gap settings. For example, the plurality of measurement settings may include measurement settings for RLM (eg, RS type, parameters for RLM (eg, RLF timer expiration period)). The plurality of measurement settings may include measurement settings for RRM (eg, RS type, parameters for RRM reporting events, adjacent cells to be measured (adjacent BWP)).
[0105]
　Specifically, the measurement set (measurement configuration, eg MeasConfig IE) may include any or any combination of the following information:
setting related and measurement target information (Measurement object, eg, MeasObject IE);
Measurement set on reporting information (measurement report configuration, eg, ReportConfig IE);
measurement set identifier (measurement identity, eg measId IE) ;
settings for & metric information (s-measure configuration, eg s -MeasureCnfig IE); and
- Measurement gap configuration, eg MeasGapConfig IE.
[0106]
　The setting information (eg, MeasObject IE) regarding the measurement target is, for example, carrier frequency information (eg, NR ARFCN), setting information regarding the reference signal (eg, ReferenceSignalConfig IE), a list of measurement target cells, and a measurement report. It may include one or more of the radio quality offsets (eg, offsetFreq) at a given event. The setting information related to the reference signal includes information on the measurement timing used for SSB-based measurement (SSB measurement timing configuration: SMTC), the presence or absence of SSB in the target cell (physical cell, BWP) (SSB presence), and CSI-RS-based. It may include at least one of the CSI-RS radio resource information used for the measurement. The offset regarding radio quality may be indicated by a combination of the RS type to be measured and the radio quality type (eg, rsrpOffsetSSB, rsrqOffsetSSB, rsrpOffsetCSI-RS, rsrqOffsetCSI-RS).
[0107]
　The setting information (eg, ReportConfig IE) regarding the measurement report may include, for example, a report type (eg, periodical, event triggered), an event setting (eventTriggerConfig), or a periodic report setting (peridocialReportConfig). In addition, they may include RS types (eg, SSB (ie NR-SS), CSI-RS).
[0108]
　The identifier (eg MeasId IE) of each measurement setting may be specified (set) in combination with the setting information regarding one measurement target and the setting information regarding one measurement report.
[0109]
　The setting information (eg s-MeasureCnfig IE) regarding the measurement reference may include, for example, a threshold value (eg, RSRP threshold value) as a reference for determining the necessity of starting measurement of the adjacent cell. Further, the information of the RS type (eg, SSB (ie NR-SS), CSI-RS) used for the determination may be included, or the threshold value may be included for each RS type.
[0110]
　The measurement gap setting information (eg MeasGapConfig IE) includes, for example, a measurement gap for each UE based on the serving cell (ie per UE measurement gap) and a measurement gap controlled by the network (eg RAN node) (ie network controlled small gap). : NCSG) or the ie per CC measurement gap in carrier aggregation may be included. Further or instead, the measurement gap setting information may include a measurement gap for each BWP (ie per BWP measurement gap). The measurement gap for each BWP is either the normal measurement gap (per UE meas gap), the network control measurement gap (NCSG), or the measurement gap is unnecessary (eg, no gap and no NCSG) for each BWP. It may consist of the information shown.
[0111]
　FIG. 17 is a sequence diagram showing an example (process 1700) of the operation of the RAN node 11 and the UE 12 according to the present embodiment. Here, the BWP group consists of BWP # 1 with SSB and BWP # 2 without SSB, and that UE12 first camps on BWP # 1 (that is, BWP # 1 is the active BWP). Assuming. In other words, BWP # 1 is the UE12 serving cell (ie physical cell).
[0112]
　In step 1701, the RAN node 11 sends an RRC Reconfiguration message to the UE 12. The RRC Reconfiguration message contains multiple measurement settings corresponding to multiple BWPs in the BWP group. Each measurement setting indicates the measurement setting used when the corresponding BWP of multiple BWPs in the BWP group is an active BWP. The RRC Reconfiguration message may include a request to send an indication indicating the need for a measurement gap per BWP. The information element (IE) corresponding to the request may be “PerBWP-GapIndicationRequest” IE.
[0113]
　In step 1702, the UE 12 sends an RRC Reconfiguration Complete message to the RAN node 11. The RRC Reconfiguration Complete message may include an indication indicating the necessity of a measurement gap for each BWP. The information element (IE) corresponding to the display may be "PerBWP-GapIndicationList" IE. In step 1703, the RAN node 11 sends an RRC Reconfiguration message to the UE 12 that includes the measurement gap setting for each BWP. The IE corresponding to the measurement gap setting may be “measGapConfigPerBWP-List” IE. The display in step 1702 may be a display indicating the necessity of the measurement gap described in the first embodiment described above. The measurement gap setting in step 1703 may be the measurement gap setting described in the first embodiment described above. In this embodiment, steps 1702 and 1703 may be omitted.
[0114]
　UE12 uses the measurement settings corresponding to BWP # 1 received in step 1701, and measures at BWP # 1 (eg, RLM measurement, CSI measurement, RRM measurement) and measurement at BWP # 2 (eg, RRM). Measurement) is performed (step 1704).
[0115]
　In step 1705, the RAN node 11 transmits control information indicating the switching of the active BWP from BWP # 1 to BWP # 2, that is, DCI on the NR PDCCH, to the UE 12. The UE 12 switches the active BWP to BWP # 2 in response to the reception of the control information (PDCCH / DCI). In other words, BWP # 2 becomes the serving cell (physical cell) of UE12. Furthermore, in accordance with the switching of active BWP, UE12 switches from the measurement setting corresponding to BWP # 1 to the measurement setting corresponding to BWP # 2, and measures with BWP # 2 according to the measurement setting corresponding to BWP # 2 (eg). , RLM measurement, CSI measurement, RRM measurement), and BWP # 1 measurement (eg, RRM measurement) are performed (step 1706).
[0116]
　The measurements in step 1706 may include SSB-based measurements and CSI-RS based measurements. If UE12 is configured for SSB-based measurements, UE12 may monitor the SSB in BWP # 1 for RLM measurements. In this case, the UE 12 may take over the setting related to the SSB-based measurement among the measurement settings corresponding to the BWP # 1 for the SSB-based measurement after the active BWP switching from the BWP # 1 to the BWP # 2. In other words, UE12 may use the measurement settings corresponding to BWP # 2 for CSI-RS based measurements after active BWP switching from BWP # 1 to BWP # 2.
[0117]
　Further or instead, the measurement settings for the component carrier frequency (measObject) may be common measurements before and after active BWP switching, except for the measurement settings specific to BWP # 1 and BWP # 2.
[0118]
　Further or instead, after switching the active BWP from BWP # 1 to BWP # 2, the UE 12 may fall back to the default measurement gap settings (eg, BWP-independent measurement gap per UE).
[0119]
The
　present embodiment provides a method of measurement setting for coping with switching of active BWP among a plurality of BWPs included in one BWP group. The configuration example of the wireless communication network according to the present embodiment is the same as the example shown in FIG.
[0120]
　In this embodiment, the RAN node 11 is a serving cell (serving BWP) in order to deal with the switching of the active BWP (without changing the cell defining SSB) among a plurality of DL BWPs included in one DL BWP group. , Active BWP) and adjacent cells (non-serving BWP, adjacent BWP) can be swapped (swap). The measurement settings are supplied to UE12 in advance by RRC signaling (eg, RRC Reconfiguration message). The UE 12 sets the measurement settings received in advance to the serving cell (serving BWP, active BWP) and the adjacent cell (serving cell (active BWP)) in response to the active BWP for communication between the UE 12 and the RAN being switched between the BWPs in the BWP group. Non-serving BWP, adjacent BWP) are exchanged and used.
[0121]
　For example, if one BWP group contains the first and second BWPs, the RAN node 11 has the first BWP as the serving cell (serving BWP) and the second BWP as the adjacent cell (adjacent BWP, non-serving BWP). The measurement setting corresponding to the situation is supplied to UE12 by RRC signaling (eg, RRC Reconfiguration message). UE12 executes the measurement (eg, RLM measurement, RRM measurement, CSI measurement) according to the measurement setting when the active BWP is the first BWP. In addition, UE12 has already received measurement settings serving cells (serving BWP) and adjacent cells (adjacent BWP, non-serving BWP) in response to the active BWP being switched from the first BWP to the second BWP. Exchange and use the relationship.
[0122]
　The RAN nodes 11 and UE12 of the present embodiment do not require RRC signaling for updating the measurement settings when switching the active BWP within the BWP group. Therefore, the RAN nodes 11 and UE12 of the present embodiment can quickly update the measurement settings in response to the switching of the active BWP in the BWP group, and follow the measurement settings corresponding to the active BWP after the switching. The measurement operation can be started quickly.
[0123]
　FIG. 18 is a sequence diagram showing an example (process 1800) of the operations of the RAN node 11 and the UE 12 according to the present embodiment. Here, the BWP group consists of BWP # 1 with SSB and BWP # 2 without SSB, and that UE12 first camps on BWP # 1 (that is, BWP # 1 is the active BWP). Assuming.
[0124]
　In step 1801, the RAN node 11 sends an RRC Reconfiguration message to the UE 12. The RRC Reconfiguration message includes measurement settings corresponding to the situation where BWP # 1 is a serving cell (serving BWP) and BWP # 2 is an adjacent cell (adjacent BWP).
[0125]
　Steps 1802 and 1803 are similar to steps 1602 and 1603 in FIG. Also in this embodiment, steps 1802 and 1803 may be omitted.
[0126]
　UE12 uses the measurement settings received in step 1801 to measure at BWP # 1 (eg, RLM, CSI, RRM) and in adjacent cells containing BWP # 2 (eg, RRM). Is executed (step 1804).
[0127]
　In step 1805, the RAN node 11 transmits control information indicating the switching of the active BWP from BWP # 1 to BWP # 2, that is, DCI on the NR PDCCH, to the UE 12. The UE 12 switches the active BWP to BWP # 2 in response to the reception of the control information (PDCCH / DCI). Further, in accordance with the switching of the active BWP, the UE 12 changes the relationship between the serving cell (serving BWP, active BWP) and the adjacent cell (non-serving BWP, adjacent BWP) with the measurement setting received (that is, held) in advance. Replace and use (step 1806). In other words, the UE 12 considers that the serving cell (serving BWP) in the measurement setting already held is BWP # 2, and performs the measurement according to at least a part of the measurement setting. Alternatively, UE12 paraphrases that BWP # 2 is a serving cell (serving BWP) and BWP # 1 is an adjacent cell (adjacent BWP), and measurement is performed according to at least a part of the measurement settings already held. You may.
[0128]
　The measurements in step 1806 may include SSB-based measurements and CSI-RS based measurements. If UE12 is configured for SSB-based measurements, UE12 may monitor the SSB in BWP # 1 for RLM measurements. In this case, the UE 12 may take over the setting related to the SSB-based measurement among the measurement settings corresponding to the BWP # 1 for the SSB-based measurement after the active BWP switching from the BWP # 1 to the BWP # 2. In other words, the UE 12 is a serving cell (serving BWP) in the measurement settings that it has received (that is, already held) in advance for the CSI-RS based measurement after switching the active BWP from BWP # 1 to BWP # 2. May be considered to be BWP # 2. Alternatively, UE12 paraphrases that BWP # 2 is a serving cell (serving BWP) and BWP # 1 is an adjacent cell (adjacent BWP), and measurement is performed according to at least a part of the measurement settings already held. You may.
[0129]
　Further or instead, the measurement settings for the carrier frequency (measObject) may be common measurements before and after active BWP switching, except for the measurement settings specific to BWP # 1 and BWP # 2.
[0130]
　Further or instead, after switching the active BWP from BWP # 1 to BWP # 2, the UE 12 sets the default measurement gap (eg, BWP-independent measurement gap per UE (ie per-UE measurement gap)). You may fall back to.
[0131]
　Further or instead, the RAN node 11 may transmit the setting of "s-measure" to the UE in advance in the measurement setting. Note that s-measure is the RSRP threshold value and is used to determine the start of measurement of an adjacent cell. UE12 starts the measurement of the adjacent cell when the RSRP of the serving cell falls below the s-measure. Furthermore, UE12 may be able to select the target of s-measure from SSB (ie ssb-rsrp) and CSI-RS (ie csi-rsrp). In this case, RAN node 11 is UE12 and s-measure is SSB. You may specify whether it is -based or CSI-RS based. UE12 determines the s-measure after switching the active BWP from BWP # 1 to BWP # 2, and determines the measured value (eg, SSB-based RSRP or CSI-RS) for the serving BWP (ie, BWP # 2) after switching. Based RSRP) may be used. Instead, the UE 12 may determine the s-measure using the measured value for the serving BWP (ie, BWP # 1) before switching.
[0132]
　The RAN node 11 handles the s-measure after switching the active BWP (that is, which of the measured value for the active BWP before switching and the measured value for the active BWP after switching is used for determining the s-measure after switching the active BWP. ) May be notified to UE12 in advance. The RAN node 11 may specify the handling of s-measure after switching the active BWP in the measurement setting or the setting information of the BWP set. Instead, the UE 12 is the RS that is the target of the s-measure after the active BWP is switched according to the setting of the RS type (eg, SSB or CSI-RS) that is the target of the s-measure before the active BWP is switched. The type may be determined. For example, when the RS type targeted for s-measure before switching the active BWP is SSB, the UE 12 may use the measured value for SSB to determine the s-measure after switching the active BWP. At this time, the UE 12 may perform measurement on the SSB in the active BWP before switching if the active BWP after switching does not include SSB, or after switching if the active BWP after switching contains SSB. Measurements may be performed on the SSB in the active BWP of.
[0133]
　For example, if the measurement setting s-measure determines the RSRP threshold of RS (eg, NR-SS) in the SSB, the RAN node 11 steps 1801 the s-measure used after switching the active BWP within the BWP group. In, the UE 12 may be notified in advance. For example, if the new active BWP (eg, active BWP # 2) in the BWP group after switching active BWP does not contain SSB, RAN node 11 will CSI-RS for s-measure after switching active BWP. RSRP threshold may be preset. Instead, if the measurement setting s-measure sets the RSRP threshold for CSI-RS (and the CSI-RS setting in BWP # 2 is transmitted from RAN node 11 to UE12), UE12 will be BWP. After switching active BWP from # 1 to BWP # 2, you may continue to use the s-measure settings before switching.
[0134]
　Subsequently, a configuration example of the RAN node 11 and the UE 12 according to the plurality of embodiments described above will be described below. FIG. 19 is a block diagram showing a configuration example of the RAN node 11 according to the above embodiment. Referring to FIG. 19, the RAN node 11 includes a Radio Frequency transceiver 1901, a network interface 1903, a processor 1904, and a memory 1905. RF transceiver 1901 performs analog RF signal processing to communicate with NG UEs, including UE12. The RF transceiver 1901 may include a plurality of transceivers. The RF transceiver 1901 is coupled with the antenna array 1902 and the processor 1904. The RF transceiver 1901 receives the modulation symbol data from the processor 1904, generates a transmit RF signal, and supplies the transmit RF signal to the antenna array 1902. Further, the RF transceiver 1901 generates a baseband reception signal based on the reception RF signal received by the antenna array 1902, and supplies the baseband reception signal to the processor 1904. The RF transceiver 1901 may include an analog beamformer circuit for beamforming. The analog beamformer circuit includes, for example, a plurality of phase shifters and a plurality of power amplifiers.
[0135]
　Network interface 1903 is used to communicate with network nodes (eg, NG Core control and transfer nodes). The network interface 1903 may include, for example, an IEEE 802.3 series compliant network interface card (NIC).
[0136]
　Processor 1904 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. Processor 1904 may include a plurality of processors. For example, the processor 1904 is a modem processor (eg, Digital Signal Processor (DSP)) that performs digital baseband signal processing and a protocol stack processor (eg, Central Processing Unit (CPU) or Micro Processing Unit (eg, Central Processing Unit (CPU)) that performs control plane processing. MPU)) may be included. Processor 1904 may include a digital beamformer module for beamforming. The digital beamformer module may include a Multiple Input Multiple Output (MIMO) encoder and precoder.
[0137]
　The memory 1905 is composed of a combination of a volatile memory and a non-volatile memory. Volatile memory is, for example, Static Random Access Memory (SRAM) or Dynamic RAM (DRAM), or a combination thereof. Non-volatile memory can be masked Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or hard disk drive, or any combination thereof. Memory 1905 may include storage located away from processor 1904. In this case, processor 1904 may access memory 1905 via network interface 1903 or an I / O interface (not shown).
[0138]
　The memory 1905 may store one or more software modules (computer programs) 1906 that include instructions and data for performing processing by the RAN nodes 11 described in the plurality of embodiments described above. In some implementations, the processor 1904 may be configured to read the software module 1906 from memory 1905 and execute it to perform the processing of the RAN node 11 described in the embodiments described above.
[0139]
　When the RAN node 11 is a gNB-CU, the RAN node 11 does not have to include the RF transceiver 1901 (and the antenna array 1902).
[0140]
　FIG. 20 is a block diagram showing a configuration example of UE12. The Radio Frequency (RF) transceiver 2001 performs analog RF signal processing to communicate with the RAN node 11. The RF transceiver 2001 may include a plurality of transceivers. The analog RF signal processing performed by the RF transceiver 2001 includes frequency up-conversion, frequency down-conversion, and amplification. The RF transceiver 2001 is coupled with the antenna array 2002 and the baseband processor 2003. The RF transceiver 2001 receives the modulation symbol data (or OFDM symbol data) from the baseband processor 2003, generates a transmit RF signal, and supplies the transmit RF signal to the antenna array 2002. Further, the RF transceiver 2001 generates a baseband reception signal based on the reception RF signal received by the antenna array 2002, and supplies the baseband reception signal to the baseband processor 2003. The RF transceiver 2001 may include an analog beamformer circuit for beamforming. The analog beamformer circuit includes, for example, a plurality of phase shifters and a plurality of power amplifiers.
[0141]
　The baseband processor 2003 performs digital baseband signal processing (data plane processing) and control plane processing for wireless communication. Digital baseband signal processing includes (a) data compression / restoration, (b) data segmentation / concatenation, (c) transmission format (transmission frame) generation / decomposition, and (d) transmission path coding / decoding. , (E) Modulation (symbol mapping) / demodulation, and (f) Generation of OFDM symbol data (baseband OFDM signal) by Inverse Fast Fourier Transform (IFFT). Control plane processing, on the other hand, includes layer 1 (eg, transmit power control), layer 2 (eg, radio resource management, and hybrid automatic repeat request (HARQ) processing), and layer 3 (eg, attach, mobility, and call management). Includes communication management of).
[0142]
　For example, digital baseband signal processing by the baseband processor 2003 includes signal processing at the Service Data Adaptation Protocol (SDAP) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, MAC layer, and PHY layer. It may be included. In addition, the control plane processing by the baseband processor 2003 may include the processing of the Non-Access Stratum (NAS) protocol, the RRC protocol, and the MAC CE.
[0143]
　Baseband processor 2003 may perform MIMO encoding and precoding for beamforming.
[0144]
　Baseband processor 2003 may include a modem processor (eg, DSP) for digital baseband signal processing and a protocol stack processor (eg, CPU or MPU) for control plane processing. In this case, the protocol stack processor that performs the control plane processing may be shared with the application processor 2004 described later.
[0145]
　The application processor 2004 is also referred to as a CPU, MPU, microprocessor, or processor core. The application processor 2004 may include a plurality of processors (a plurality of processor cores). The application processor 2004 includes a system software program (Operating System (OS)) read from memory 2006 or a memory (not shown) and various application programs (eg, call application, web browser, mailer, camera operation application, music playback). By executing the application), various functions of UE12 are realized.
[0146]
　In some implementations, the baseband processor 2003 and application processor 2004 may be integrated on one chip, as shown by the broken line (2005) in FIG. In other words, the baseband processor 2003 and the application processor 2004 may be implemented as one System on Chip (SoC) device 2005. SoC devices are sometimes referred to as system large scale integrations (LSIs) or chipsets.
[0147]
　The memory 2006 is a volatile memory, a non-volatile memory, or a combination thereof. The memory 2006 may include a plurality of physically independent memory devices. Volatile memory is, for example, SRAM or DRAM or a combination thereof. Non-volatile memory can be MROM, EEPROM, flash memory, or a hard disk drive, or any combination thereof. For example, memory 2006 may include external memory devices accessible from baseband processor 2003, application processor 2004, and SoC 2005. Memory 2006 may include internal memory devices integrated within the baseband processor 2003, application processor 2004, or SoC 2005. Further, the memory 2006 may include the memory in the Universal Integrated Circuit Card (UICC).
[0148]
　The memory 2006 may store one or more software modules (computer programs) 2007 that include instructions and data for performing processing by the UE 12 described in the plurality of embodiments described above. In some implementations, the baseband processor 2003 or application processor 2004 is configured to read the software module 2007 from memory 2006 and execute it to perform the processing of UE12 described with reference to the drawings in the above embodiments. May be done.
[0149]
　It should be noted that the control plane processing and operation performed by the UE 12 described in the above-described embodiment is performed by other elements other than the RF transceiver 2001 and the antenna array 2002, that is, at least one of the baseband processor 2003 and the application processor 2004, and the software module 2007. It can be realized by the memory 2006 that stores the software.
[0150]
　As described with reference to FIGS. 19 and 20, each of the processors included in the RAN node 11 and the UE 12 according to the above-described embodiment includes a group of instructions for causing the computer to perform the algorithm described with reference to the drawings. Execute one or more programs. This program can be stored and supplied to a computer using various types of non-transitory computer readable medium. Non-temporary computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical disks), Compact Disc Read Only Memory (CD-ROM), CD- Includes R, CD-R / W, semiconductor memory (eg, mask ROM, Programmable ROM (PROM), Erasable PROM (EPROM), flash ROM, Random Access Memory (RAM)). The program may also be supplied to the computer by various types of transient computer readable medium. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
[0151]
The
　above-described embodiments may be implemented independently, or the whole embodiment or a part thereof may be combined as appropriate.
[0152]
　In the above embodiment, switching of active BWP by DCI transmitted by NR PDCCH has been described. However, the switching of active BWP in the above-described embodiment may be performed by MAC CE or a timer (eg, BWP Inactivity Timer).
[0153]
　In the above-described embodiment, it has been described mainly on the assumption that one BWP is activated for each UE (ie 1 active BWP per UE). However, it goes without saying that the method described in the above-described embodiment can also be applied when a plurality of BWPs are activated for each UE. For example, there may be multiple active BWPs in a BWP set. Further, there may be one active BWP corresponding to each of the plurality of BWP groups set in the BWP set, or there may be a plurality of active BWPs in the BWP group.
[0154]
　The above-described embodiment can also be applied to MR-DC (eg, EN-DC) and NR-NR DC. For example, in EN-DC, MeNB, SgNB, and UE may operate as follows. First, the UE transmits NR capability (eg, UE NR radio capability information) to MeNB using RRC signaling (eg, UE Capability Information message), and MeNB transfers the NR capability to SgNB. In addition, MeNB sends a request (eg, “PerBWP-GapIndicationRequest” IE) indicating the necessity of the measurement gap for each BWP in the SCG of NR to the UE in the LTE RRC Connection Reconfiguration message. SgNB may trigger the transmission of the request to MeNB with an X2 message. In response to receiving the request, the UE sends a display (eg, “perBWP-GapIndicationList” IE) indicating the necessity of the measurement gap for each BWP to MeNB in ​​the LTE RRC Connection Reconfiguration Complete message. MeNB transfers the display (eg, “perBWP-GapIndicationList” IE) received from UE to SgNB. Then, SgNB sends the measurement gap setting for each BWP (eg, “measGapConfigPerBWP-List” IE) to MeNB, and MeNB sends the setting to the UE in the LTE RRC Connection Reconfiguration message. The information transmitted by UE and SgNB may be encoded by NR RRC.
[0155]
　Instead, in EN-DC, MeNB, SgNB, and UE may operate as follows. SgNB may use a transparent RRC container to send “PerBWP-GapIndicationRequest” and “measGapConfigPerBWP-List” to UE via MeNB. Specifically, SgNB includes an NR RRC Reconfiguration message including "PerBWP-GapIndicationRequest" in the transparent RRC container and sends the transparent RRC container to MeNB. MeNB sends the transparent RRC container (which includes “PerBWP-GapIndicationRequest”) received from SgNB to the UE in the LTE RRC Connection Reconfiguration message. The UE sends an NR RRC Reconfiguration Complete message containing the “perBWP-GapIndicationList” to MeNB using the LTE RRC Connection Reconfiguration Complete message. MeNB forwards the NR RRC Reconfiguration Complete message containing “perBWP-GapIndicationList” to SgNB. Then, SgNB includes the NR RRC Reconfiguration message including “measGapConfigPerBWP-List” in the transparent RRC container and sends the transparent RRC container to MeNB. MeNB received transparent RRC from SgNB Send the container (which contains “measGapConfigPerBWP-List”) to the UE with an LTE RRC Connection Reconfiguration message. In order to realize this, X2 messages (ie, sequential SN MODIFICATION REQUIRED, SN MODIFICATION REQUEST, SN MODIFICATION REQUEST ACKNOWLEDGEMENT, SN MODIFICATION COMPLETE) in the SN (ie SgNB) Initiated SN Modification procedure may be used respectively.
[0156]
　Further instead, in EN-DC, SgNB and UE are required to request the measurement gap per BWP, indicate the necessity of the measurement gap per BWP, and transfer the measurement gap setting per BWP. A direct radio bearer between SgNB and UE established in may be used. The radio bearer may be a Signaling Radio Bearer 3 (SRB3). Specifically, SgNB sends a “PerBWP-GapIndicationRequest” to the UE in the NR RRC Reconfiguration message on SRB3. The UE sends a “perBWP-GapIndicationList” to SgNB in ​​the NR RRC Reconfiguration Complete message on SRB3. Then, sgNB sends “measGapConfigPerBWP-List” to the UE in the NR RRC Reconfiguration message on SRB3.
[0157]
　In the above embodiment, the term cell defining SSB is used because it refers to a BWP corresponding to a cell (physical cell) from the UE point of view or an SSB representing a BWP group corresponding to a set of the physical cells. It may be called a cell representative SSB. Alternatively, the cell defining SSB may be referred to as a cell-specific SSB from the viewpoint of specifying a representative cell (physical cell) including the SSB. In addition, the cell defining SSB may be referred to as the serving SSB because it is the SSB that should be monitored when the UE stays in either the BWP or the BWP group that contains it.
[0158]
　The sub-PCI described in the above embodiments may be associated with the BWP index.
[0159]
　The reference BWP described in the above embodiments may be referred to as default BWP, initial BWP, reference BWP, primary BWP, anchor BWP, or master BWP. That is, the first BWP to stay when the UE first accesses the RAN node (when transitioning from ie, Idle mode to Connected mode) is the reference BWP, default BWP, initial BWP, reference BWP, primary BWP, anchor BWP. , Or may be called master BWP. Further or instead, among the plurality of BWPs included in the system band, the BWP that is not the reference BWP may be referred to as a sub BWP, a secondary BWP, or a slave BWP.
[0160]
　Furthermore, the above-described embodiment is merely an example relating to the application of the technical idea obtained by the inventor of the present invention. That is, the technical idea is not limited to the above-described embodiment, and it goes without saying that various changes can be made.
[0161]
　Some or all of the above embodiments may also be described, but not limited to:
[0162]
(Supplementary Note 1)
　A wireless terminal,
　a memory,
　and at least one processor coupled to said memory,
comprising a
　at least one processor is among behind the bwps included in the plurality of downlink bandwidth parts (behind the bwps) The
　plurality of downlink BWPs are configured to transmit an indication indicating the necessity of a measurement gap for measurement to a radio access network (RAN) node in the radio access network (RAN), and the plurality of downlink BWPs have one system band. The
　at least one processor is configured to further receive measurement settings from the RAN node, including measurement gap settings for one or more BWPs included in the plurality of downlink BWPs. ,
Wireless terminal.
[0163]
(Appendix 2) The
　display is for measuring one or more BWPs different from the activated BWP when one of the plurality of downlink BWPs is activated for the wireless terminal. The wireless terminal according to
Appendix 1, which indicates whether or not the wireless terminal requires a measurement gap .
[0164]
(Appendix 3) The
　display indicates whether or not the wireless terminal requires a measurement gap for one or more of the plurality of downlink BWPs that are different from the BWP activated for the wireless terminal.
The wireless terminal according to Appendix 1, which is shown for each BWP .
[0165]
(Appendix 4) The
　display includes information on a BWP combination indicating a combination of two or more BWPs included in the plurality of downlink BWPs, and one BWP in each BWP combination is activated for the wireless terminal. The wireless terminal according to
Appendix 1, which indicates whether or not the wireless terminal requires a measurement gap for the measurement of each of the remaining BWPs of each BWP pair .
[0166]
(Supplementary Note 5) The
　at least one processor according to the measurement gap setting in response to the activation BWP for communication between the wireless terminal and the RAN being switched between the plurality of downlink BWPs.
The wireless terminal according to any one of Appendix 1 to 4, which is configured to use the measurement gap setting corresponding to the activated BWP .
[0167]
(Appendix 6) The
　measurement gap setting sets one or more BWPs different from the activated BWP when one of the plurality of downlink BWPs is activated for the wireless terminal. The wireless terminal according to
any one of Appendix 1 to 5 , which shows a setting regarding a measurement gap for the wireless terminal to measure .
[0168]
(Appendix 7) The wireless terminal according to Appendix 6,
　wherein the measurement gap setting indicates the presence / absence of the measurement gap, the length of the measurement gap, and at least one of the patterns of the measurement gap
.
[0169]
(Supplementary
　Note 8)
The wireless terminal according to any one of Supplementary note 1 to 7, wherein the plurality of downlink BWPs are associated with one cell specific signal block (SSB) .
[0170]
(Appendix 9) The
　measurement gap setting is a first measurement gap setting and a second measurement gap setting for each of the first downlink BWP and the second downlink BWP included in the plurality of downlink BWPs. The
　at least one processor is configured to receive the first and second measurement gap settings from the RAN node using Radio Resource Control (RRC) signaling, and the
　at least one processor further comprises.
　The
　cell is configured to use the first measurement gap setting to measure another downlink BWP when the first downlink BWP is activated for communication with the RAN. The RAN node is configured to receive control information indicating switching of the activation BWP from the first downlink BWP to the second downlink BWP without changing the specific SSB, and the
　control information is received. In response, the activation BWP for communication with the RAN is switched from the first downlink BWP to the second downlink BWP, and a measurement gap setting for measuring another downlink BWP is set. The
wireless terminal according to Appendix 8 , which is configured to switch from the first measurement gap setting to the second measurement gap setting .
[0171]
(Appendix 10) The wireless terminal according to Appendix 9,
　wherein the control information is a non-RRC message
.
[0172]
(Supplementary Note 11)
　A radio access network (RAN) node disposed in the wireless access network (RAN),
　a memory,
　and at least one processor coupled to said memory,
comprising a
　at least one processor, It is configured to receive from the wireless terminal an indication indicating the necessity of a measurement gap for measurement between BWPs included in a plurality of downlink bandwidth parts (BWPs), and the
　plurality of downlink BWPs are one. Within the system band, the
　at least one processor is configured to further transmit measurement settings to the radio terminal, including measurement gap settings for one or more BWPs included in the plurality of downlink BWPs.
Being a RAN node.
[0173]
(Appendix 12) The
　display is for measuring one or more BWPs different from the activated BWP when one of the plurality of downlink BWPs is activated for the wireless terminal.
The RAN node according to Appendix 11, which indicates whether or not the wireless terminal requires a measurement gap .
[0174]
(Appendix 13) The
　display indicates whether or not the wireless terminal requires a measurement gap for one or more of the plurality of downlink BWPs that are different from the BWP activated for the wireless terminal.
The RAN node according to Appendix 11, which is shown for each BWP .
[0175]
(Appendix 14) The
　display includes information on a BWP combination indicating a combination of two or more BWPs included in the plurality of downlink BWPs, and one BWP in each BWP combination is activated for the wireless terminal.
RAN node according to Appendix 11, which indicates whether the wireless terminal requires a measurement gap for the measurement of each of the remaining BWPs of each BWP pair when done .
[0176]
(Appendix 15) The
　measurement gap setting sets one or more BWPs different from the activated BWP when one of the plurality of downlink BWPs is activated for the wireless terminal.
The RAN node according to any one of Appendix 11 to 14 , which shows a setting regarding a measurement gap for measurement by the wireless terminal .
[0177]
(Appendix 16) The RAN node according to Appendix 15,
　wherein the measurement gap setting indicates the presence or absence of the measurement gap, the length of the measurement gap, and at least one of the patterns of the measurement gap
.
[0178]
(Supplementary
　note 17)
The RAN node according to any one of Supplementary note 11 to 16, wherein the plurality of downlink BWPs are associated with one cell-specific synchronization signal block (SSB) .
[0179]
(Appendix 18) The
　measurement gap setting is a first measurement gap setting and a second measurement gap setting for each of the first downlink BWP and the second downlink BWP included in the plurality of downlink BWPs. The
　at least one processor is configured to transmit the first and second measurement gap settings to the radio terminal using Radio Resource Control (RRC) signaling, and the
　at least one processor further comprises.
　The first measurement gap setting is used by the wireless terminal to measure another downlink BWP when the first downlink BWP is activated for communication with the RAN.
　Control information indicating switching of the activated BWP from the first downlink BWP to the second downlink BWP , which is configured to communicate with the wireless terminal in consideration of The
　control information is configured to be transmitted to the wireless terminal, and the control information triggers the wireless terminal to switch the activation BWP for communication with the RAN from the first downlink BWP to the second downlink BWP.
The RAN node according to Appendix 17, which also triggers the wireless terminal to switch the measurement gap setting for measuring another downlink BWP from the first measurement gap setting to the second measurement gap setting .
[0180]
(Supplementary note 19) The RAN node according to Supplementary note 18,
　wherein the control information is a non-RRC message
.
[0181]
(Appendix 20)
　A method for a wireless terminal, in
　which an indication indicating the necessity of a measurement gap for measurement between BWPs included in a plurality of downlink bandwidth parts (BWPs) is displayed in a radio access network (RAN). To transmit to the Radio Access Network (RAN) node, where the plurality of downlink BWPs are contained within one system band; and
　one or more of the BWPs included in the plurality of downlink BWPs. A method comprising receiving a measurement setting from the RAN node, including a measurement gap setting for the purpose
.
[0182]
(Appendix 21)
　A method in a radio access network (RAN) node arranged in a radio access network (RAN), which is
　a key point of a measurement gap for measurement between BWPs included in a plurality of downlink bandwidth parts (BWPs). Receiving an indication from the radio terminal, wherein the plurality of downlink BWPs are included in one system band; and
　one or more of the plurality of downlink BWPs. A method comprising transmitting measurement settings, including measurement gap settings for BWPs, to the radio terminal
.
[0183]
(Supplementary Note 22)
　A program for causing a process in a computer in a wireless terminal,
　the method,
　shows the necessity of the measurement gap for the measurement between behind the bwps included in the plurality of downlink bandwidth parts (behind the bwps) Sending an indication to a radio access network (RAN) node within a radio access network (RAN), where the plurality of downlink BWPs are included within one system band; and
　said multiple downs. A
program comprising receiving measurement settings from the RAN node, including measurement gap settings for one or more BWPs included in the link BWPs .
[0184]
(Appendix 23)
　A program for causing a computer to perform a method on a radio access network (RAN) node arranged in a radio access network (RAN), and the
　method is included in a
　plurality of downlink bandwidth parts (BWPs). Receiving an indication from the radio terminal indicating the necessity of a measurement gap for measurement between the BWPs, wherein the plurality of downlink BWPs are included in one system band; and the
　plurality. A
program comprising transmitting a measurement setting, including a measurement gap setting for one or more BWPs included in the downlink BWPs, to the radio terminal .
[0185]
(Supplementary Note 24)
　A wireless terminal,
　a memory and,
　at least one processor coupled to the memory,
provided with,
　the at least one processor, a first downlink bandwidth part (BWP) and the second down Receive the first and second measurement settings for each of the link BWPs from the Radio Access Network (RAN) node within the Radio Access Network (RAN) using Radio Resource Control (RRC) signaling. Configured,
　the first and second downlink BWPs are contained within one system band and associated with one cell-specific synchronization signal block (SSB), the
　at least one processor further
　comprising said first. The first downlink that is configured to use the first measurement setting when the downlink BWP of 1 is activated for communication with the RAN and
　does not involve modification of the cell specific SSB. Control information indicating switching of the activation BWP from the BWP to the second downlink BWP is configured to be received from the RAN node, and
　in response to the reception of the control information, the first downlink BWP is said to receive the control information. A
radio terminal configured to switch the activation BWP for communication with the RAN to the second downlink BWP and to switch the measurement setting from the first measurement setting to the second measurement setting .
[0186]
(Supplementary note 25) The wireless terminal according to Supplementary note 24,
　wherein the control information is a non-RRC message
.
[0187]
(Appendix 26) The wireless terminal according to Appendix 24 or 25,
　wherein each of the first and second measurement settings includes a measurement gap setting
.
[0188]
(Supplementary Note 27)
　A radio access network (RAN) node,
　a memory,
　and at least one processor coupled to said memory,
comprising a
　at least one processor, a first downlink bandwidth part (BWP) The first and second measurement settings for each of the first and second downlink BWPs are configured to be transmitted to the radio terminal using Radio Resource Control (RRC) signaling,
　said first and second. The two downlink BWPs are contained within one system bandwidth and are associated with one cell-specific synchronization signal block (SSB), the
　at least one processor being further
　radio-accessed by the first downlink BWP. When activated for communication with a network (RAN), the
　cell specific is configured to communicate with the radio terminal in consideration of the first measurement setting being used by the radio terminal. It is configured to transmit control information indicating switching of the activation BWP from the first downlink BWP to the second downlink BWP without changing the SSB to the radio terminal.
　The control information triggers the wireless terminal to switch the activation BWP for communication with the RAN from the first downlink BWP to the second downlink BWP, and sets the measurement setting to the first. A
RAN node that triggers the wireless terminal to switch from the measurement setting to the second measurement setting .
[0189]
(Supplementary note 28) The RAN node according to Supplementary note 27,
　wherein the control information is a non-RRC message
.
[0190]
(Appendix 29) The RAN node according to Appendix 27 or 28,
　wherein each of the first and second measurement settings includes a measurement gap setting
.
[0191]
(Appendix 30) 　Radio Resource Control for the first measurement setting and the second measurement setting for each of the first downlink bandwidth part (BWP) and the second downlink BWP
　, which is a method in a radio terminal.
Receiving from a radio access network (RAN) node within a radio access network (RAN) using (RRC) signaling, wherein the first and second downlink BWPs are contained within one system band. And associated with one cell-specific synchronization signal block (SSB);
　the first measurement setting is used when the first downlink BWP is activated for communication with the RAN. That;
　receiving control information from the RAN node indicating switching of the activated BWP from the first downlink BWP to the second downlink BWP without changing the cell-specific SSB; and the
　control information. In response to the reception of, the activation BWP for communication with the RAN is switched from the first downlink BWP to the second downlink BWP, and the measurement setting is changed from the first measurement setting to the first. A
method comprising switching to the measurement setting of 2 .
[0192]
(Appendix 31)
　A method in a radio access network (RAN) node,
　the first measurement setting and the second measurement setting for each of the first downlink bandwidth part (BWP) and the second downlink BWP. Is transmitted to the radio terminal using Radio Resource Control (RRC) signaling, wherein the first and second downlink BWPs are included in one system band and one cell-specific synchronization. Associated with a signal block (SSB);
　the first measurement setting is used by the radio terminal when the first downlink BWP is activated for communication with a radio access network (RAN). Communication with the radio terminal in consideration of the fact; and
　control information indicating switching of the activated BWP from the first downlink BWP to the second downlink BWP without changing the cell-specific SSB. To the radio terminal, where the control information switches the activation BWP for communication with the RAN from the first downlink BWP to the second downlink BWP. To trigger the radio terminal to switch the measurement setting from the first measurement setting to the second measurement setting
.
[0193]
(Appendix 32)
　A program for causing a computer to perform a method in a radio terminal,
　wherein the method is a
　first measurement for each of a first downlink bandwidth part (BWP) and a second downlink BWP. The setting and the second measurement setting are received from the radio access network (RAN) node in the radio access network (RAN) using Radio Resource Control (RRC) signaling, wherein the first and second measurement settings are received. The downlink BWP is contained within one system bandwidth and is associated with one cell-specific synchronization signal block (SSB);
　the first downlink BWP is activated for communication with the RAN. Occasionally, the first measurement setting is used;
　control information indicating the switching of the activated BWP from the first downlink BWP to the second downlink BWP without modification of the cell-specific SSB. Receiving from the RAN node; and
　in response to receiving the control information, switching the activation BWP for communication with the RAN from the first downlink BWP to the second downlink BWP, and A
program comprising switching a measurement setting from the first measurement setting to the second measurement setting .
[0194]
(Appendix 33)
　A program for causing a computer to perform a method on a radio access network (RAN) node,
　wherein the method is for a
　first downlink bandwidth part (BWP) and a second downlink BWP, respectively. The first and second measurement settings of the above are transmitted to the radio terminal using Radio Resource Control (RRC) signaling, where the first and second downlink BWPs are one system. Included in the band and associated with one cell-specific synchronization signal block (SSB);
　said when the first downlink BWP is activated for communication with a radio access network (RAN). Communicating with the radio terminal in view of the first measurement setting being used by the radio terminal; and
　the second downlink from the first downlink BWP without modification of the cell-specific SSB. Sending control information indicating switching of activation BWP to BWP to the radio terminal, where the control information communicates with the RAN from the first downlink BWP to the second downlink BWP. A program comprising triggering the radio terminal to switch the activation BWP for and triggering the radio terminal to switch the measurement setting from the first measurement setting to the second measurement setting
.
[0195]
(Supplementary Note 34)
　A wireless terminal,
　a memory and,
　at least one processor coupled to the memory,
provided with,
　the at least one processor, a first downlink bandwidth part (BWP) and the second down The measurement settings for the link BWP are configured to receive from the Radio Access Network (RAN) node within the Radio Access Network (RAN) using Radio Resource Control (RRC) signaling,
　said first and second down. The link BWP is contained within one system band and is associated with one cell specific synchronization signal block (SSB), the
　at least one processor further having
　the first downlink BWP communicate with the RAN. The activation
　BWP from the first downlink BWP to the second downlink BWP that is configured to use the measurement settings when activated for and without modification of the cell specific SSB. The control information indicating the switching is received from the RAN node, and
　in response to the reception of the control information, the first downlink BWP to the second downlink BWP for communication with the RAN. A
radio terminal configured to switch the activation BWP of the above and to exchange and use the relationship between the serving cell and the adjacent cell in the measurement setting .
[0196]
(Supplementary note 35) The wireless terminal according to Supplementary note 34,
　wherein the control information is a non-RRC message
.
[0197]
(Appendix 36) A 　radio access network method using Radio Resource Control (RRC) signaling for measurement settings for the first downlink bandwidth part (BWP) and the second downlink BWP
　, which is a method for radio terminals.
Receiving from a radio access network (RAN) node within (RAN), where the first and second downlink BWPs are contained within one system band and one cell specific synchronization signal block ( Associated with SSB);
　use the measurement settings when the first downlink BWP is activated for communication with the RAN;
　the first without modification of the cell-specific SSB. To receive control information from the RAN node indicating the switching of the activation BWP from the downlink BWP to the second downlink BWP; and
　in response to the reception of the control information, the first downlink BWP. To the second downlink BWP from the above, the activation BWP for communication with the RAN is switched, and the relationship between the serving cell and the adjacent cell in the measurement setting is exchanged and used
.
[0198]
(Appendix 37)
　A program for causing a computer to perform a method in a radio terminal,
　wherein the method
　sets measurement settings for a first downlink bandwidth part (BWP) and a second downlink BWP, Radio Resource. Receiving from a radio access network (RAN) node within a radio access network (RAN) using Control (RRC) signaling, where the first and second downlink BWPs are within one system band. Included and associated with one cell-specific synchronization signal block (SSB)
　; using the measurement settings when the first downlink BWP is activated for communication with the RAN;
　Receiving control information from the RAN node indicating switching of the activated BWP from the first downlink BWP to the second downlink BWP without changing the cell-specific SSB; and
　receiving the control information. In response to, the activation BWP for communication with the RAN is switched from the first downlink BWP to the second downlink BWP, and the relationship between the serving cell and the adjacent cell in the measurement setting is exchanged. A
program that has to be used .
[0199]
　This application claims priority on the basis of Japanese application Japanese Patent Application No. 2017-218039 filed on November 13, 2017, and incorporates all of its disclosures herein.
Code description
[0200]
11 RAN Node
12 UE
1904 Processor
1905 Memory
2003 Baseband Processor
2004 Application Processor
The scope of the claims
[Claim 1]
　A wireless terminal,
　a memory and,
　at least one processor coupled to the memory,
provided with,
　at least one processor is for the measurement between behind the bwps included in the plurality of downlink bandwidth parts (BWPs) It is configured to send an indication indicating the necessity of a measurement gap to a radio access network (RAN) node in the radio access network (RAN), and the
　plurality of downlink BWPs are included in one system band. The radio terminal ,
　wherein the at least one processor is further configured to receive measurement settings from the RAN node, including measurement gap settings for one or more BWPs included in the plurality of downlink BWPs
.
[Claim 2]
　The indication is that when one of the plurality of downlink BWPs is activated for the radio terminal, the radio terminal for measurement of one or more BWPs different from the activated BWP.
The wireless terminal according to claim 1, indicating whether or not a measurement gap is required .
[Claim 3]
　The display indicates for each BWP whether or not the wireless terminal requires a measurement gap for one or more of the plurality of downlink BWPs that are different from the BWP activated for the wireless terminal.
The wireless terminal according to claim 1, as shown .
[Claim 4]
　The display includes information about a BWP combination indicating a combination of two or more BWPs contained in the plurality of downlink BWPs, when one BWP of each BWP combination is activated for the wireless terminal. The wireless terminal according to
claim 1, indicating whether or not the wireless terminal requires a measurement gap for the measurement of each of the remaining BWPs of each BWP pair .
[Claim 5]
　The at least one processor attaches to the activated BWP according to the measurement gap setting as the activated BWP for communication between the wireless terminal and the RAN is switched between the plurality of downlink BWPs.
The wireless terminal according to any one of claims 1 to 4, which is configured to use the corresponding measurement gap setting .
[Claim 6]
　In the measurement gap setting, when one of the plurality of downlink BWPs is activated for the wireless terminal, the wireless terminal sets one or more BWPs different from the activated BWP.
The wireless terminal according to any one of claims 1 to 5 , which shows a setting regarding a measurement gap for measurement .
[Claim 7]

The wireless terminal according to claim 6, 　wherein the measurement gap setting indicates the presence / absence of the measurement gap, the length of the measurement gap, and at least one of the patterns of the measurement gap .
[Claim 8]

The wireless terminal according to any one of claims 1 to 7, 　wherein the plurality of downlink BWPs are associated with one cell-specific signal block (SSB) .
[Claim 9]
　The measurement gap configuration, includes a first measurement gap setting and a second measurement gap configuration for the respective first downlink BWP and second downlink BWP included in the plurality of downlink behind the bwps,
　wherein The at least one processor is configured to receive the first and second measurement gap settings from the RAN node using Radio Resource Control (RRC) signaling, and the
　at least one processor further
　comprises the first.
　Modifications to the cell-specific SSB that are configured to use the first measurement gap setting to measure other downlink BWPs when the downlink BWP is activated for communication with the RAN. Control information indicating switching of the activation BWP from the first downlink BWP to the second downlink BWP without the above is received from the RAN node, and
　in response to the reception of the control information, the control information is received. The activation BWP for communication with the RAN is switched from the first downlink BWP to the second downlink BWP, and a measurement gap setting for measuring another downlink BWP is set in the first measurement.
The wireless terminal according to claim 8 , which is configured to switch from the gap setting to the second measurement gap setting .
[Claim 10]

The wireless terminal according to claim 9, 　wherein the control information is a non-RRC message .
[Claim 11]
　A radio access network (RAN) node located in a radio access network (RAN)
　that
　comprises a memory and at least one processor coupled to the memory
,
　wherein the at least one processor is a plurality of downlinks. The
　plurality of downlink BWPs are configured to receive from the wireless terminal an indication indicating the necessity of a measurement gap for measurement between BWPs included in bandwidth parts (BWPs), and the plurality of downlink BWPs are within one system band. included,
　the at least one processor is further configured to transmit a measurement configuration including a measurement gap configuration for one or more BWPs included in the plurality of downlink BWPs to said wireless terminal,
RAN node.
[Claim 12]
　The indication is that when one of the plurality of downlink BWPs is activated for the radio terminal, the radio terminal for measurement of one or more BWPs different from the activated BWP.
The RAN node of claim 11, indicating whether or not a measurement gap is required .
[Claim 13]
　The indication is for each BWP whether or not the wireless terminal requires a measurement gap for one or more of the plurality of downlink BWPs that are different from the BWP activated for the wireless terminal.
The RAN node according to claim 11, as shown .
[Claim 14]
　The display includes information about a BWP combination indicating a combination of two or more BWPs contained in the plurality of downlink BWPs, when one BWP of each BWP combination is activated for the wireless terminal.
The RAN node of claim 11, indicating whether the wireless terminal requires a measurement gap for the measurement of each of the remaining BWPs of each BWP pair .
[Claim 15]
　In the measurement gap setting, when one of the plurality of downlink BWPs is activated for the wireless terminal, the wireless terminal sets one or more BWPs different from the activated BWP.
The RAN node according to any one of claims 11 to 14 , indicating a setting relating to a measurement gap for measurement .
[Claim 16]

The RAN node according to claim 15, 　wherein the measurement gap setting indicates the presence or absence of the measurement gap, the length of the measurement gap, and at least one of the patterns of the measurement gap .
[Claim 17]

The RAN node according to any one of claims 11 to 16, 　wherein the plurality of downlink BWPs are associated with one cell-specific synchronization signal block (SSB) .
[Claim 18]
　The measurement gap configuration, includes a first measurement gap setting and a second measurement gap configuration for the respective first downlink BWP and second downlink BWP included in the plurality of downlink behind the bwps,
　wherein The at least one processor is configured to transmit the first and second measurement gap settings to the radio terminal using Radio Resource Control (RRC) signaling, and the
　at least one processor further
　comprises the first. Considering that the first measurement gap setting is used by the wireless terminal to measure another downlink BWP when the downlink BWP is activated for communication with the RAN.
　Control information indicating switching of the activated BWP from the first downlink BWP to the second downlink BWP , which is configured to communicate with the wireless terminal and does not involve a change in the cell-specific SSB, is transmitted to the wireless terminal. The
　control information is configured to transmit , triggering the wireless terminal to switch the activated BWP for communication with the RAN from the first downlink BWP to the second downlink BWP, as well as others.
17. The RAN node of claim 17 , which triggers the wireless terminal to switch the measurement gap setting for measuring the downlink BWP from the first measurement gap setting to the second measurement gap setting .
[Claim 19]

The RAN node according to claim 18, 　wherein the control information is a non-RRC message .
[Claim 20]

　A radio access network within a radio access network (RAN) that is a 　method in a radio terminal and indicates the necessity of a measurement gap for measurement between BWPs included in multiple downlink bandwidth parts (BWPs). Sending to the (RAN) node, where the plurality of downlink BWPs are contained within one system band; and
　the measurement gap for one or more BWPs contained in the plurality of downlink BWPs. A
method comprising receiving measurement settings including settings from the RAN node .
[Claim 21]
　A method for radio access network (RAN) nodes located in a radio access network (RAN)
　that indicates the need for a measurement gap for measurement between BWPs contained in multiple downlink bandwidth parts (BWPs). Receiving the indication from the radio terminal, where the plurality of downlink BWPs are included within one system band; and
　for one or more BWPs included in the plurality of downlink BWPs. A
method comprising transmitting a measurement setting, including a measurement gap setting, to the radio terminal .
[Claim 22]
　The non-transitory computer readable medium storing a program for causing a method in a wireless terminal to a computer,
　the method comprising
　measuring for measurement between behind the bwps included in the plurality of downlink bandwidth parts (BWPs) Sending an indication indicating the necessity of a gap to a radio access network (RAN) node in a radio access network (RAN), wherein the plurality of downlink BWPs are included in one system band. A non-transitory computer-readable medium
　comprising ; and receiving measurement settings from the RAN node, including measurement gap settings for one or more BWPs included in the plurality of downlink BWPs
.
[Claim 23]
　A non-temporary computer-readable medium containing a program that allows a computer to perform a method on a radio access network (RAN) node located in a radio access network (RAN),
　wherein the method has
　multiple downlink bandwidths. Receiving from the radio terminal an indication indicating the necessity of a measurement gap for measurement between BWPs included in parts (BWPs), where the plurality of downlink BWPs are within one system band. A non-transitory computer-readable medium
　comprising; transmitting measurement settings to the radio terminal, including measurement gap settings for one or more BWPs included in the plurality of downlink BWPs
.
[Claim 24]
　A wireless terminal,
　a memory,
　and at least one processor coupled to said memory
comprises a,
　wherein the at least one processor, each of the first downlink bandwidth part (BWP) and a second downlink BWP The first and second measurement settings for are configured to be received from a radio access network (RAN) node within the radio access network (RAN) using Radio Resource Control (RRC) signaling,
　said The first and second downlink BWPs are contained within one system bandwidth and are associated with one cell specific synchronization signal block (SSB), the
　at least one processor further
　comprising said first downlink. From
　the first downlink BWP to the first downlink BWP configured to use the first measurement setting when the BWP is activated for communication with the RAN and without modification of the cell specific SSB. The control information indicating the switching of the activation BWP to the downlink BWP of 2 is configured to be received from the RAN node, and
　in response to the reception of the control information, the first downlink BWP to the second downlink A
wireless terminal configured to switch the activation BWP for communication with the RAN to the link BWP and switch the measurement setting from the first measurement setting to the second measurement setting .
[Claim 25]

The wireless terminal according to claim 24, 　wherein the control information is a non-RRC message .
[Claim 26]

The wireless terminal according to claim 24 or 25, 　wherein each of the first and second measurement settings includes a measurement gap setting .
[Claim 27]
　A radio access network (RAN) node,
　memory and,
　at least one processor coupled to said memory
comprises a,
　the at least one processor, a first downlink bandwidth part (BWP) and a second The first and second measurement settings for each of the downlink BWPs are configured to be transmitted to the radio terminal using Radio Resource Control (RRC) signaling,
　said first and second downlinks. The BWP is contained within one system band and is associated with one cell-specific synchronization signal block (SSB), the
　at least one processor further having
　the first downlink BWP in a radio access network (RAN). When activated for communication with, the first measurement setting is configured to communicate with the radio terminal in consideration of being used by the radio terminal, and
　changes to the cell-specific SSB. It is configured to transmit control information indicating switching of the activation BWP from the first downlink BWP to the second downlink BWP without accompanying the radio terminal, and the
　control information is the first downlink. The radio terminal is triggered to switch the activation BWP for communication with the RAN from the BWP to the second downlink BWP, and the measurement setting is switched from the first measurement setting to the second measurement setting. Trigger the wireless terminal,
RAN node.
[Claim 28]

The RAN node according to claim 27, 　wherein the control information is a non-RRC message .
[Claim 29]

The RAN node according to claim 27 or 28, 　wherein each of the first and second measurement settings includes a measurement gap setting .
[Claim 30]

　Radio Resource Control (RRC) signaling of the first and second measurement settings for each of the first downlink bandwidth part (BWP) and the second downlink BWP 　, which is a method in a radio terminal. To receive from a radio access network (RAN) node in a radio access network (RAN), where the first and second downlink BWPs are contained within one system band and 1 Associated with one cell specific synchronization signal block (SSB);
　using the first measurement setting when the first downlink BWP is activated for communication with the RAN;
　said cell. Receiving control information from the RAN node indicating the switching of the activation BWP from the first downlink BWP to the second downlink BWP without changing the specific SSB; and
　responding to the reception of the control information. Then, the activation BWP for communication with the RAN is switched from the first downlink BWP to the second downlink BWP, and the measurement setting is changed from the first measurement setting to the second measurement setting.
How to be prepared to switch to .
[Claim 31]

　Radio Resource, a 　method in the Radio Access Network (RAN) node, with the first and second measurement settings for each of the first downlink bandwidth part (BWP) and the second downlink BWP. Sending to a radio terminal using Control (RRC) signaling, where the first and second downlink BWPs are contained within one system band and one cell specific synchronization signal block (SSB). );
　Consider that the first measurement setting is used by the radio terminal when the first downlink BWP is activated for communication with a radio access network (RAN). And communicate with the radio terminal; and
　control information indicating the switching of the activated BWP from the first downlink BWP to the second downlink BWP without changing the cell-specific SSB is transmitted to the radio terminal. The control information triggers the radio terminal to switch the activated BWP for communication with the RAN from the first downlink BWP to the second downlink BWP. A
method of triggering the radio terminal to switch the measurement setting from the first measurement setting to the second measurement setting .
[Claim 32]
　A non-temporary computer-readable medium containing a program for causing a computer to perform a method on a radio terminal,
　wherein the method is a
　first downlink bandwidth part (BWP) and a second downlink BWP, respectively. To receive the first and second measurement settings for the radio access network (RAN) node within the radio access network (RAN) using Radio Resource Control (RRC) signaling, where the above The first and second downlink BWPs are contained within one system bandwidth and are associated with one cell specific synchronization signal block (SSB);
　the first downlink BWP is for communication with the RAN. Use the first measurement setting when activated in;
　the activation BWP from the first downlink BWP to the second downlink BWP without modification of the cell-specific SSB. Receiving control information indicating switching from the RAN node; and
　in response to receiving the control information, the activity for communication with the RAN from the first downlink BWP to the second downlink BWP. A
non-temporary computer-readable medium comprising switching the BWP and switching the measurement setting from the first measurement setting to the second measurement setting .
[Claim 33]
　A non-temporary computer-readable medium containing a program that allows a computer to perform a method on a Radio Access Network (RAN) node,
　wherein the method is a
　first downlink bandwidth part (BWP) and a second downlink. Sending the first and second measurement settings for each of the link BWPs to the radio terminal using Radio Resource Control (RRC) signaling, where the first and second downlinks said. The BWP is contained within one system band and is associated with one cell-specific synchronization signal block (SSB);
　the first downlink BWP is activated for communication with a radio access network (RAN). When the first measurement setting is used by the radio terminal to communicate with the radio terminal; and
　from the first downlink BWP without modification of the cell-specific SSB. Sending control information indicating switching of the activation BWP to the second downlink BWP to the radio terminal, where the control information is from the first downlink BWP to the second downlink BWP. wherein with triggering to the wireless terminal to switch the activation BWP for communication with the RAN, triggers the wireless terminal to switch the measurement configuration from the first measurement set in the second measurement configuration in,
the A non-temporary computer-readable medium.
[Claim 34]
　A wireless terminal,
　a memory and,
　at least one processor coupled to the memory,
provided with,
　at least one processor is for the first downlink bandwidth part (BWP) and a second downlink BWP The measurement settings of are configured to be received from a radio access network (RAN) node within a radio access network (RAN) using Radio Resource Control (RRC) signaling,
　the first and second downlink BWPs. Within one system band and associated with one cell-specific synchronization signal block (SSB), the
　at least one processor further
　activates the first downlink BWP for communication with the RAN.
　Indicates the switching of the activated BWP from the first downlink BWP to the second downlink BWP when configured to use the measurement settings and without modification of the cell specific SSB. It is configured to receive control information from the RAN node, and
　in response to the reception of the control information, the activation BWP for communication with the RAN from the first downlink BWP to the second downlink BWP. A
wireless terminal configured to be used by switching between the two and exchanging the relationship between the serving cell and the adjacent cell in the measurement setting .
[Claim 35]

The wireless terminal according to claim 34, 　wherein the control information is a non-RRC message .
[Claim 36]
　A method in a radio terminal, in which
　measurement settings for a first downlink bandwidth part (BWP) and a second downlink BWP are set in a radio access network (RAN) using Radio Resource Control (RRC) signaling. Receiving from a Radio Access Network (RAN) node, where the first and second downlink BWPs are contained within one system band and associated with one cell-specific synchronization signal block (SSB).
　Use the measurement settings when the first downlink BWP is activated for communication with the RAN ; the first downlink BWP
　without modification of the cell-specific SSB. To receive control information indicating the switching of the activation
　BWP from the first downlink BWP to the second downlink BWP from the RAN node; and in response to the reception of the control information, from the first downlink BWP to the second. A method comprising switching the activation BWP for communication with the RAN to the downlink BWP of the above, and exchanging the relationship between the serving cell and the adjacent cell in the measurement setting
.
[Claim 37]
　A non-temporary computer-readable medium containing a program for causing a computer to perform a method in a radio terminal,
　wherein the method is for a
　first downlink bandwidth part (BWP) and a second downlink BWP. The measurement settings are received from a radio access network (RAN) node within the radio access network (RAN) using Radio Resource Control (RRC) signaling, wherein the first and second downlink BWPs. Included in one system band and associated with one cell-specific synchronization signal block (SSB);
　said measurement when said first downlink BWP is activated for communication with said RAN. Use the settings
　; receive control information from the RAN node indicating the switching of the activated BWP from the first downlink BWP to the second downlink BWP without changing the cell-specific SSB; And
　, in response to the reception of the control information, the activation BWP for communication with the RAN is switched from the first downlink BWP to the second downlink BWP, and the serving cell and the adjacent cell in the measurement setting are switched. A
non-temporary computer-readable medium that can be used by exchanging relationships .