[0001]The present disclosure relates to wireless communication systems and, more particularly, at the same time communication using a plurality of cells of different Radio Access Technologies the wireless terminal is operated by a different radio station (RATs).
BACKGROUND
[0002]3rd Generation Partnership Project (3GPP) has (see Non-Patent Document 1) fifth standardization work generation mobile communication system (5G) as 3GPP Release 14 have started in 2016 towards the introduction of after 2020. 5G is realized by a combination of innovative improvement and development through the introduction of continuous improvement and development of the LTE and LTE-Advanced (enhancement / evolution) and new 5G air interface (new Radio Access Technology (RAT)) It is assumed to be. New RAT, for example, LTE / LTE-Advanced continuous development frequency band of interest (eg, 6 GHz or less) frequencies higher than, for example 10 GHz or more super high frequency band and 30 GHz or more mm to support the sideband.
[0003]
　In this specification, the fifth-generation mobile communication system is also referred to 5G System, or Next Generation (NextGen) System (NG System). New RAT for 5G System is, New Radio (NR), called 5G RAT, or NG RAT. New radio access network for 5G System (Radio Access Network (RAN)) is referred to as 5G-RAN or NextGen RAN (NG RAN). New base station within the 5G-RAN is called NR NodeB (NR NB) or gNodeB (gNB). New core network for 5G System is called 5G Core Network (5G-CN) or NextGen Core (NG Core). Wireless terminal connected to 5G System (User Equipment (UE)) is, 5G UE, called NextGen UE (NG UE) or simply UE. RAT for 5G System, UE, radio access network, core network, the network entity (node), and the official name, such as protocol layer will be future decisions in the process of standardization work progresses.
[0004]
　Also, the term "LTE" as used herein, unless otherwise indicated, includes an improvement and development of the LTE and LTE-Advanced for enabling interworking between 5G System. Improvement and development of the LTE and LTE-Advanced for interworking with 5G System is, LTE-Advanced Pro, LTE +, or also called enhanced LTE (eLTE). Furthermore, "Evolved Packet Core (EPC)" as used herein, "Mobility Management Entity (MME)", "Serving Gateway (S-GW)", and "Packet Data Network (PDN) Gateway (P-GW terminology LTE network or logical entities) "or the like, unless otherwise indicated, includes these improvements and development for enabling interworking between 5G System. Improved EPC, MME, S-GW, and P-GW, 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, in order of Quality of Service (QoS) and packet routing, the bearer for each and PDN connection specific QoS class RAN (ie, Evolved Universal Terrestrial RAN (E-UTRAN)) and a core network (ie, used by both EPC). That is, in the Bearer-based QoS (or per-bearer QoS) concept is one or more Evolved Packet System (EPS) bearers are set up between the P-GW of the UE and EPC, the plurality that have the same QoS class service data flow (service data flows (SDFs)) is transferred through one EPS bearer satisfying these QoS. SDF is, Policy and Charging Control (PCC) rule-based SDF template (ie, packet filters) is one or more packet flows that match. Further, for packet routing, each packet to be sent through the EPS bearer can discern whether associated with this packet which bearer (ie, General Packet Radio Service (GPRS) Tunneling Protocol (GTP) tunnel) (The identify ) contains information for.
[0006]
　In contrast, in 5G System, might radio bearer is used in the 5G-RAN, the bearers in an interface between the 5G-CN in and 5G-CN and 5G-RAN has been considered not to be used are (see non-Patent Document 1). Specifically, PDU Flows are defined instead of the EPS bearer, one or more SDFs are mapped to one or more PDU Flows. PDU flow between the user plane termination entity in 5G UE and NG Core (ie, the entity corresponding to the P-GW in the EPC) corresponds to the EPS bearer in EPS Bearer-based QoS concepts. PDU flow corresponds to the finest particle size of the packet forwarding and processing within 5G system (treatment) (finest granularity). In other words, 5G System is, Bearer-based QoS concept of place in Flow-based QoS (or per-flow QoS) to adopt the concept. In the Flow-based QoS concept, QoS is handled in the PDU flow unit (handled). The QoS framework 5G system, PDU flow is identified by PDU flow ID in the header that encapsulates the Service Data Unit of NG3 tunnel interface (encapsulating). NG3 interface, 5G-CN and gNB (ie, It is a user plane interface between the 5G-RAN). Association between 5G UE and the data network (association) is referred to as PDU session (PDU session). PDU session is a term corresponding to LTE and LTE-Advanced PDN connection (PDN connection). Can be more than one PDU Flows are set in one PDU session.
[0007]
　It should be noted, PDU flow is also referred to as "QoS flow". QoS flow is the finest granularity of QoS processing within 5G system (treatment) (finest granularity). User plane traffic with the same NG3 marking value in PDU session corresponds to QoS flow. NG3 marking corresponds to the PDU flow ID described above, also called QoS flow ID, further also called Flow Identification Indicator (FII).
[0008]
　Figure 1 shows the basic architecture of the 5G system. UE establishes one or more signaling radio bearers (Signalling Radio Bearers (SRBs)) and one or more data radio bearers (Data Radio Bearers (DRBs)) between the GNb. 5G-CN and gNB establishes a control plane interfaces and user plane interface for the UE. Control plane interface between the 5G-CN and gNB (ie, RAN) is referred to as NG2 interface or NG-c interface, transfer of Non-Access Stratum (NAS) information and control between 5G-CN and GNb It is used for information (eg, NG2 AP information Element). User plane interface between the 5G-CN and gNB (ie, RAN) is called the NG3 interface or NG-u interface, the transfer of packets of one or more PDU Flows in the UE the PDU session (packets-) They are used to.
[0009]
　Incidentally, (see Annex J, and Non-Patent Document 2 Non-Patent Document 1) architecture shown in FIG. 1, but one of the plurality of 5G architectural options (or deployment scenarios (deployment Scenarios)). Architecture shown in Figure 1 is a architecture called "Standalone NR (in NextGen System)" or "Option 2". In contrast, FIGS. 2 and 3 show "Non-standalone NR in EPS" and referred to architectural options 3 and 3A, respectively. 2 and 3, the control plane interface is shown by a dotted line, the user plane interface is shown in solid lines. Architecture options 3 and 3A are anchor RAT (or primary RAT or master RAT) dual connectivity arrangement comprising NR as E-UTRA and secondary RAT as (Dual connectivity (DC) deployments). Option 3 and 3A, E-UTRA (LTE eNB) and NR (GNb) is connected to the EPC. NR user plane connection to the EPC is via the LTE eNB Option 3 but passes directly to the user plane interface between the options in 3A GNb and EPC.
[0010]
　Non-Patent Document 3, the architecture options 3 and 3A, i.e. the DC architecture E-UTRA and NR are connected to the EPC, proposes to NR GNb supports DC function of LTE (Functionalities) and procedures (procedures The) doing. Further, Non-Patent Document 3, in the DC architecture E-UTRA and NR are connected to the EPC, NR GNb is an LTE QoS framework (ie, bearer based QoS) the EPC, toward the LTE eNB, and UE apply it is proposed to. More specifically, Non-Patent Document 3 proposes the following matters:
· NR when gNB is added as a secondary node, the required QoS services (ie, bearer) LTE DC for setting procedure (eg, SeNB addition) is applied that;
for-LTE of Secondary Cell Group (SCG) bearer options, E-UTRAN Radio Access bearer ( E-RAB) is established between the EPC and NR GNb ; is it is
for-LTE split bearer options, it X2-U is established between the LTE eNB and GNb;
for-LTE SCG bearer options and split bearer options, NR GNb the DRB is established between the UE.
[0011]
　Non-Patent Document 4, the architecture option 3A, one-to-one mapping between the DRB (ie, SCG bearer) of S1-U and SCG: proposes that there is (1 1 mapping). Non-Patent Document 4, further, EPC of the QoS attribute (attributes) is used for the EPS bearers, thus radio bearer parameters used in QoS parameters a (parameters) NR used in EPC (radio bearer It has proposed that there is a need to be mapped to parameters).
[0012]
　Also, the 5G system, the system information includes system information always be broadcast, not necessarily to be always broadcast and (not always) the system information. Always broadcasted system information is referred to as "Minimum SI" or "Essential SI". Necessarily system information that is not necessarily to be always broadcast is referred to as the "Other SI" or "On-demand SI". Minimum SI requires to be periodically broadcast in the cell. Minimum SI is information to support cell selection, information for acquiring On-demand SI, and the information for accessing the cell that includes at least being contemplated. The term Other SI refers to any system information not broadcast in Minimum SI. Some or all of Other SI corresponds to the On-demand SI. On-demand SI is transmitted by gNB after being triggered by the UE or the network. In other words, GNb responds to SI request from UE (SI request), sends the requested (requested) SI response including system information (SI response) to the UE.
[0013]
　There are several proposed delivery mechanism Other SI (or On-demand SI) (e.g., see Non-Patent Document 5-8). SI request from the UE, the first message of the random access procedure (Msg1), i.e. may be transmitted with the random access preamble may be transmitted in a third message of the random access procedure (Msg3), RRC it may be transmitted in a separate Radio Resource Control (RRC) signaling after connection establishment. Transmission of SI response by gNB may be a unicast to the requested UE, may be a group cast to a group of UEs including the requested UE, aperiodic (non-periodic) Broadcast it may be. For unicast SI response, SI response including Other SI (or On-demand SI), the second message (Msg2) of the random access procedure, i.e. may be transmitted in a random access response (RAR), may be transmitted in the fourth message random access procedure (Msg3), it may be transmitted in a separate Radio Resource Control (RRC) signaling after RRC connection establishment. For groups cast or aperiodic broadcast SI response, paging mechanism may be utilized, SI response including Other SI (or On-demand SI) is a UE or UE group identifier (eg, Paging Radio Network Temporary Identifier (P-RNTI)) may be broadcast in the paging occasion determined (paging occasion) on the basis of.
CITATION
Non-patent literature
[0014]
非特許文献1 : 3GPP TR 23.799 V14.0.0 (2016-12) “3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Study on Architecture for Next Generation System (Release 14)”, December 2016
非特許文献2 : 3GPP TR 38.801 V1.0.0 (2016-12) “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on New Radio Access Technology; Radio Access Architecture and Interfaces (Release 14)”, December 2016
非特許文献3 : 3GPP R2-168400, NTT DOCOMO, INC., “QoS and bearer for DC between LTE and NR”, 3GPP TSG-RAN WG2 Meeting #96, Reno, USA, 14-18 November 2016
非特許文献4 : 3GPP R2-168686, Nokia, Alcatel-Lucent Shanghai Bell, “EPC - NR PDCP interaction for tight interworking: User Plane aspects”, 3GPP TSG-RAN WG2 Meeting #96, Reno, USA, 14-18 November 2016
非特許文献5 : 3GPP R2-166120, China Academy of Telecommunications Technology (CATT), “On-demand system information delivery mechanism”, 3GPP TSG-RAN WG2 Meeting #95bis, Kaohsiung, 10-14 October 2016
非特許文献6 : 3GPP R2-166203, Huawei, HiSilicon, “Delivery of “Other SI” in NR” , 3GPP TSG-RAN WG2 Meeting #95bis, Kaohsiung, 10-14 October 2016
非特許文献7 : 3GPP R2-166342, ZTE, ZTE Microelectronics, “Consideration on the Other SI delivery in NR” , 3GPP TSG-RAN WG2 Meeting #95bis, Kaohsiung, 10-14 October 2016
非特許文献8 : 3GPP R2-166343, ZTE, ZTE Microelectronics, “Consideration on the Other SI delivery in NR” , 3GPP TSG-RAN WG2 Meeting #95bis, Kaohsiung, 10-14 October 2016
Summary of the Invention
Problems that the Invention is to Solve
[0015]
　Present inventors have conducted studies with respect to interworking between E-UTRA and NR, we found several problems. For example, the E-UTRA-NR Dual Connectivity (DC) architecture E-UTRA and NR are connected to the EPC (ie, architectural options 3 and 3A), Secondary GNb as secondary nodes (SgNB) is above Other to support the SI (or On-demand SI) delivery. However, whether to know whether any Other SI in SgNB the E-UTRA-NR DC (or On-demand SI) is available (available) to which UE is is not clear.
[0016]
　The problem with Other SI (or On-demand SI), the other E-UTRA-NR DC architecture (eg, architectural options 7 and 7A) can occur any time. Architecture options 7 and 7A are anchor RAT (or primary RAT or master RAT) dual connectivity arrangement comprising NR as E-UTRA and secondary RAT as (Dual connectivity (DC) deployments). Option 7 and 7A, E-UTRA (LTE eNB) and NR (GNb) is connected to the 5G-CN. NR user plane connection to 5G-CN is via the Option 7 LTE eNB, but passes directly to the user plane interface between the options in 7A GNb and 5G-CN. In the case of option 7 and 7A, when SgNB supports Other SI (or On-demand SI) delivered, which of Other SI (or On-demand SI) is available (available) in SgNB UE but it is not clear how the know.
[0017]
　Additionally, similar issues Other SI (or On-demand SI) may also occur in Inter-RAT handover to NR from E-UTRA. That is, when the UE is handed over to the target gNB supporting Other SI (or On-demand SI) delivered from the source LTE eNB, which Other SI (or On-demand SI) in the target NR cell available (available) or whether the UE is how to know is is not clear.
[0018]
　Therefore, one of the objective to be achieved is the embodiment disclosed herein, the secondary gNB in ​​Inter-RAT handover to NR from Inter-RAT dual Connectivity and E-UTRA between the E-UTRA and NR or apparatus that enables notification indicator cells available on-demand system information of the target gNB the (indication) to the UE, is to provide a method, and a program. Incidentally, this objective should more embodiments disclosed herein is noted that only one of several objects of it and to achieve. Other objects or problems and novel features will become apparent from the description, or the accompanying drawings of this specification.
Means for Solving the Problems
[0019]
　In a first aspect, the second radio access network (RAN) node, is used in a wireless communication system. The second RAN node includes a memory, and at least one processor coupled to said memory. Wherein the at least one processor is configured to send the wireless terminal display of the available on-demand system information (indication) via a first RAN node in the cell of the second RAN node. The on-demand system information available, the response to a request from the wireless terminal, is transmitted via the second or the in the cell of the RAN node a first RAN node.
[0020]
　In a second aspect, the first radio access network (RAN) node, is used in a wireless communication system. The first RAN node includes a memory, and at least one processor coupled to said memory. Wherein the at least one processor is configured to receive indication of available on-demand system information in the cell of the second RAN node (indication) from the second RAN node, and the display of the first It is configured to transmit to the radio terminal in the cell of the RAN nodes. The on-demand system information available, the response to a request from the wireless terminal, is transmitted via the second or the in the cell of the RAN node a first RAN node.
[0021]
　In a third aspect, the radio terminal is used in a wireless communication system. The wireless terminal includes at least one radio transceiver and at least one processor. Wherein the at least one wireless transceiver is configured to communicate with the first radio access network (RAN) node and a second RAN node. Wherein the at least one processor, displays a (indication) of the second available on-demand system information in the cell of the RAN node, via the first RAN node receives from the second RAN node It is configured. The on-demand system information available, the response to a request from the wireless terminal, is transmitted via the second or the in the cell of the RAN node a first RAN node.
[0022]
　In a fourth aspect, the method, via the first RAN node Show (indication) of the second available on-demand system information in the cell of the RAN nodes in the second radio access network (RAN) node Te includes sending the wireless terminal. The on-demand system information available, the response to a request from the wireless terminal, is transmitted via the second or the in the cell of the RAN node a first RAN node.
[0023]
　In a fifth aspect, the method of the first radio access network (RAN) node, receiving the display of the available on-demand system information in the cell of the second RAN node (indication) from the second RAN node to, and including, transmitting to the wireless terminal in the cell of the display the first RAN node. The on-demand system information available, the response to a request from the wireless terminal, is transmitted via the second or the in the cell of the RAN node a first RAN node.
[0024]
　In a sixth aspect, a method in a wireless terminal, the display of the available on-demand system information in the cell of the second radio access network (RAN) node (indication), via the first RAN node, wherein It includes receiving from the second RAN node. The on-demand system information available, the response to a request from the wireless terminal, is transmitted via the second or the in the cell of the RAN node a first RAN node.
[0025]
　In a seventh aspect, the program, when loaded into a computer, including a fourth above, fifth, or sixth instructions for causing the method to a computer in accordance with aspects of the (software code).
Effect of the invention
[0026]
　According to the embodiments described above, E-UTRA and Inter-RAT dual connectivity and secondary gNB or available on-demand system information in cells of the target gNB in ​​Inter-RAT handover to NR from E-UTRA between NR device that enables display notification (indication) to the UE, can be provided a method, and a program.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027]
FIG. 1 is a diagram illustrating the basic architecture of the 5G System according to background art.
[2] according to the background art, it shows the architecture option 3 for dual connectivity for E-UTRA (LTE eNB) and NR (GNb) is connected to the EPC.
[3] according to the background art, it shows the architecture option 3A for dual connectivity for E-UTRA (LTE eNB) and NR (GNb) is connected to the EPC.
4 is a diagram showing an example of configuration of a wireless communication network in accordance with some embodiments.
5 is a diagram showing another configuration example of a wireless communication network according to some embodiments.
[6] according to the first embodiment and illustrating an example of a procedure for sending an indication of available on-demand system information to the UE.
[7] according to the first embodiment and illustrating an example of a procedure for sending an indication of available on-demand system information to the UE.
[8] according to the first embodiment and illustrating an example of a procedure for sending an indication of available on-demand system information to the UE.
9 is a sequence diagram showing an example of SCG establishment procedure according to the second embodiment.
FIG. 10 is a sequence diagram showing an example of Inter-RAT handover procedure according to the third embodiment.
11 is a block diagram showing a configuration example of a NR GNb according to some embodiments.
12 is a block diagram showing a configuration example of a UE according to some embodiments.
DESCRIPTION OF THE INVENTION
[0028]
　Hereinafter, specific embodiments will be described in detail with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same reference numerals, for clarity of description, repeated explanation is omitted as appropriate.
[0029]
　A plurality of embodiments described below can can either be carried out independently, also be implemented in appropriate combination. These several embodiments have different novel features together. Accordingly, the plurality of embodiments, contribute to solving the different purpose or task to each other, which contributes to achieve different effects from each other.
[0030]
　A plurality of embodiments shown below is described the DC architecture E-UTRA and NR are connected to the EPC as the main subject. However, these embodiments may be applied to other wireless communication systems that support DC architecture different RAT is connected to a common core network employing different QoS framework.
[0031]

　FIG. 4 shows a configuration example of a wireless communication network according to some embodiments including the present embodiment. In the example of FIG. 4, a wireless communications network comprises a LTE eNB1, NR gNB2, UE3, and EPC4. Wireless communication network shown in Figure 4, supports dual connectivity (DC), which supports an optional 3 or Option 3A or both mentioned above. Option 3 and 3A supports dual connectivity including NR as E-UTRA and secondary RAT as an anchor RAT (or primary RAT). Option 3 and 3A, E-UTRA (LTE eNB1 ) and NR (GNB2) is connected to the EPC4. NR user plane connection to EPC4 is via the LTE eNB1 Option 3, UE3 user packets through the interface 401 between the interface 403, as well as eNB1 and EPC between base stations. On the other hand, the option 3A, NR user plane connection to EPC4 passes through the direct user plane interface 404 between gNB2 the EPC4.
[0032]
　UE3 has the primary RAT capability to communicate simultaneously with gNB2 associated with (E-UTRA) to the associated eNB1 and secondary RAT (NR). In other words, UE3 has the primary RAT capability and cell aggregating the gNB2 associated with (E-UTRA) eNB1 cells associated with the secondary RAT (NR). Furthermore other words, UE3 has the ability to be set both cell gNB2 associated with the primary RAT (E-UTRA) eNB1 cells associated with the secondary RAT (NR). In architectural options 3 and 3A, the air interface 402 between eNB1 and UE3 provide control plane connection and user plane connection. On the other hand, air interface 405 between the gNB2 and UE3 may include at least user plane connection may not include the control plane connection. In DC architecture E-UTRA and NR are connected to EPC4, the master eNB (MeNB) 1 provides one or more E-UTRA MCG cell UE3, secondary gNB (SgNB) 2 is 1 or more the NR SCG cells provides the UE3.
[0033]
　EPC4 includes a plurality of core network nodes comprising MME5 and S-GW6. MME5 is control plane node, S-GW6 is a user plane node. MME5 performs an attach already (ie, EMM-REGISTERED state) mobility management and bearer management of UEs are in the core network. Mobility management is used to track the current location of the UE (keep track), including maintaining a mobility management context (MM context) about the UE. Bearer management, the UE controls the establishment of EPS bearers for communicating with an external network via the E-UTRAN and EPC4 including eNB1 (Packet Data Network (PDN)), to maintain the EPS bearer context for the UE including. S-GW6 is the gateway between E-UTRAN, is connected to the eNB1 or gNB2 or both via the S1-U interface.
[0034]
　Wireless communication network according to some embodiments including the present embodiment may not support the architectural options 3 and 3A. The wireless communication network may also support other E-UTRA-NR DC architecture (eg, architectural options 7 and 7A). Additionally or alternatively, the wireless communication network may support Inter-RAT handover to NR from E-UTRA.
[0035]
　Figure 5 shows another configuration example of a wireless communication network according to some embodiments including the present embodiment. In one example, the wireless communication network may provide E-UTRA-NR DC architecture option 7 or 7A. Option 7 and 7A, E-UTRA (LTE eNB1) and NR (GNB2) is connected to the 5G-CN7. NR user plane connection to 5G-CN7 is via the optional 7 In LTE eNB1, UE3 user packets through the interface 902 between the inter-base station interface 403, as well as eNB1 and 5G-CN7. On the other hand, the option 7A, NR user plane connection to 5G-CN7 passes through the direct user plane interface 902 between the gNB2 and 5G-CN7.
[0036]
　Additionally or alternatively, the wireless communications network of FIG. 5 may support Inter-RAT handover to NR cell 21 NR GNB2 from E-UTRA cell 11 of LTE eNB1.
[0037]
　Then, in the following, the display of the Inter-RAT dual connectivity as well as in the Inter-RAT handover available in the cell 21 of gNB2-on-demand system information from E-UTRA to the NR between E-UTRA and NR a (indication) procedures for notification to UE3 will be explained. As already described, the on-demand system information (On-demand SI) corresponds to a part or all of Other SI.
[0038]
　Figure 6 is a diagram showing an example (process 600) procedure to send an indication of available on-demand system information in the cell of SgNB2 the UE. GNB2 operates to send the UE3 through the eNB1 the display of the available on-demand system information (indication) in the cell 21 of GNB2. The display, the number of available on-demand system information (eg, SIB number), an identifier (eg, SI group identity), type (SIB type), or category (SI category) display list or display the bitmap indicating the it may be. Additionally or alternatively, the display may scheduling information available on-demand system information or may be information of a radio resource used for requesting of the on-demand system information. Furthermore, a combination thereof. For example, the display is already displayed list or displayed bits and scheduling information for transmitting attachment of the (scheduled or transmitted) on-demand system information, for on-demand system information that is not transmitted as system information as system information it may include a map. On-demand system information in response to a request from UE3, or in response to a network (eg, GNb) its trigger is transmitted in the cell 21 of GNB2. UE3, by watching the display, UE3 wishes (or intended) on-demand system information (ie, at least a part of Other SI) is equal to or available in the cell 21 of gNB2 be able to.
[0039]
　That is, in step 601, GNB2 sends display of the available on-demand system information (indication) to the eNB1 in the cell 21 of GNB2. For example, GNB2 is inter-base station interface (eg, Xn interface) between eNB1 and GNB2 via may transmit an indication of the available on-demand system information includes control message to the eNB1.
[0040]
　In step 602, eNB1 receives indication of available on-demand system information (indication) from GNB2, transmits an indication received in UE3 in the cell 11 of the eNB1. For example, eNB1, the cell 11 of the eNB1 via the RRC connection between eNB1 and UE3 in (ie, Primary Cell (PCell) or Source cell), the RRC message including an indication received may be transmitted to UE3 .
[0041]
　According to the procedure of FIG. 6, UE3, the second RAT (ie, NR) of the display available on-demand system information in the cell 21 of gNB2 the (indication) first RAT (ie, E-UTRA ) can be received from eNB1 of.
[0042]
　Instead of the procedure illustrated in FIG. 6, receives a display (indication) of the available on-demand system information in the cell 21 of the eNB1 according to the procedure shown in FIG. 7 or FIG. 8 GNB2, further eNB1 is the display it may be transmitted to the UE3.
[0043]
　7, in the procedure eNB1 to establish a direct interface (eg, Xn) and GNB2, an example of receiving an indication of the available on-demand system information (indication) in the cell 21 of GNB2. In step 701, eNB1 transmits the GNB2 Xn interface establishment request (eg, Xn Setup Request message) to. In step 702, GNB2 transmits a response (eg, Xn Setup Request Response message) to request to establish Xn interfaces to eNB1. At this time, GNB2 transmits display possible on-demand system information utilizing (indication) to the eNB1 in the cell 21. Further, in step 703, GNB2, when changing the settings of its own (eg, availability of on-demand system information), using the message (eg, gNB Configuration Update message) for notifying the change, the changed the display of the may be sent to the eNB1.
[0044]
　8, eNB1 in response to a request for UE3, an example of requesting display of the available on-demand system information (indication) in the cell 21 to GNB2. In step 801, UE3 transmits display the available on-demand system information in the cell 21 a message requesting (indication) to gNB2 (eg, On Demand SI information Request message) to the eNB1. This is not an explicit message, implicit message (eg, measurement reporting for Cell21) any good. In step 802, eNB1 transmits for requesting the display on GNB2, it led to the UE the (UE the Associated) message (eg, On Demand SI Status Request message). In step 803, GNB2, in response to UE the Associated message in step 802, sends a message (eg, On Demand SI Status Response message) to the eNB1 including the display. In step 804, eNB1 transmits the display dedicated signaling (eg, RRC Connection Reconfiguration message including indication of available On demand SI) to UE3 in. Incidentally, eNB1 the system information the display in the cell 11 (eg, System Information Block type-X including indication of available On demand SI in neighour NR cell) may be sent as (step 805). These procedures, eNB1 and UE3 may receive display of the available on-demand system information (indication) in the cell 21 of GNB2. The display of the available on-demand system information in the cell 21 sent from gNB2 to eNB1 (indication), the information elements of the RRC layer (eg, RRC container) may be transmitted as, for Xn protocol layer information element (eg, Xn information element) may be transmitted as.
[0045]

　configuration example of a wireless communication network of this embodiment is the same as FIG. 4 or 5. This embodiment, in Inter-RAT dual connectivity to a and NR a E-UTRA primary RAT and secondary RAT, the display of the secondary gNB (SgNB) available on-demand system information in the second cell 21 (indication) via the master eNB (MeNB) 1 provides an example of a procedure of sending from SgNB2 to UE3.
[0046]
　In the present embodiment, MeNB1 and SgNB2 may support E-UTRA-NR DC architecture option 3 or 3A. That, MeNB1 and SgNB2 may be connected to EPC4. Alternatively, MeNB1 and SgNB2 may support E-UTRA-NR DC architecture option 7 or 7A. That, MeNB1 and SgNB2 may be connected to the 5G-CN7.
[0047]
　SgNB2 according to the present embodiment, in the procedure of setting the NR DRB for E-UTRA-NR DC, to send the first Radio Resource Control (RRC) message including a set of NR DRB to UE3 via MeNB1 It is configured. It said first RRC message further includes an indication of the available on-demand system information in a cell of SgNB2 (indication). The display shows at least an on-demand system information available in a cell of SgNB2 to UE3 of NR DRB is set. MeNB1 the first RRC message MeNB1 cell (eg, PCell) received from SgNB2 is configured to forward to UE3 in. Thus, UE3, during the procedure for setting the NR DRB for E-UTRA-NR DC, either on-demand system information (ie, at least a part of Other SI) are available in cell SgNB2 it is possible to know whether or not there.
[0048]
　Figure 9 shows an example of SCG establishment procedure for setting NR data radio bearer cell SgNB2 a (NR DRB) to UE3 (processing 900). Procedure shown in Figure 9, has followed the SeNB Addition, procedures of LTE DC basically. The steps in FIG. 9, UE3 receives in SCG establishment procedure to display the available on-demand system information in cells SgNB2 (ie, NR DRB configuration instructions).
[0049]
　In step 901, MeNB1 sends SgNB Addition Request message to SgNB2. SgNB Addition Request message requests the setting of the radio bearer for the DC to use E-UTRA and NR as the primary RAT and secondary RAT respectively (SCG DRB or Split DRB) to SgNB2. Specifically, SgNB Addition Request message, "SgNB Security Key (for SCG bearer)" information element (Information Element (IE)), "E-RAB To Be Added List" IE, and "MeNB to SgNB Container" IE including. "E-RAB To Be Added List" IE includes E-RAB ID and E-RAB Level QoS Parameters of the E-RAB required to establish the MeNB1. "MeNB to SgNB Container" IE is, RRC: including the SCG-ConfigInfo message. RRC: SCG-ConfigInfo message is used by the MeNB to request the SgNB to establish (establish), modified (the modify), or releases (release) SCG. SCG-ConfigInfo message comprises, for example, EPS bearer Identity, DRB Identity, and DRB type. Note that cells of secondary RAT (NR) (eg, a radio link, AS layer) with a cell of a primary RAT (E-UTRA) (eg, a radio link, AS layer) security policy to be used in (eg, security algorithm) may be it is different. In this case, SgNB Security Key IE may include information security policy to be used in the cell of the secondary RAT (NR). Furthermore, SgNB2 the RRC transmits the information of the Security Policy to UE3: may be included in the SCG-Config message.
[0050]
　In step 902, SgNB2 sends SgNB Addition Request Acknowledge message to MeNB1. SgNB Addition Request Acknowledge message is a response message to SgNB Addition Request message. Specifically, SgNB Addition Request Acknowledge message, including the "E-RAB Admitted To Be Added List" IE, and "SgNB to MeNB Container" IE. "SgNB to MeNB Container" IE is, RRC: including the SCG-Config message. RRC: SCG-Config message corresponds to a "first RRC message" described above. RRC: SCG-Config message is used to transfer the radio resource configuration of SCG DRB generated by SgNB2 (or Split DRB). Further, RRC: SCG-Config message includes the display of the possible on-demand system information available in a cell of SgNB2 to UE3 of NR DRB is set to (indication). Further, RRC: SCG-Config message may include a Minimum SI in the cell of SgNB2.
[0051]
　In step 903, MeNB1 in response to receiving the SgNB Addition Request Acknowledge message from SgNB2, sends the RRC Connection Reconfiguration message to the UE3. The RRC Connection Reconfiguration message, SgNB Addition Request Acknowledge sent message from SgNB2 using the MeNB1 RRC: including SCG-Config message. AS layer of UE3 primary RAT (ie, E-UTRA (LTE)) receives the RRC Connection Reconfiguration message at E-UTRA cell MeNB1 (ie, Primary Cell (PCell)). AS layer of UE3 secondary RAT (ie, NR) is, RRC: based on the SCG-Config message, it sets the SCG DRB or Split DRB in NR cell SgNB2.
[0052]
　UE3 (ie, AS layer of NR) is further, RRC: taken from SCG-Config message with reference to the "display of available On-demand SI", UE3 wishes (or intended) Other SI is SgNB2 it is determined whether or not available in the cell. In the example of FIG. 9, UE3 is (ie, E-UTRA AS layer), SI request (SI request) RRC Connection Reconfiguration Complete message MeNB1 E-UTRA cell including at (ie, Primary Cell (PCell)) send to MeNB1 (step 904). SI request is a request for transmission of an on-demand system information for SgNB2. MeNB1 is, to forward the SI request received from the UE3 to SgNB2. MeNB1 is a SgNB Reconfiguration Complete message includes SI request may be sent to SgNB2 (step 905).
[0053]
　The transmission of SI requests by steps 904 and 905 in FIG. 9 is an example. UE3 (ie, NR AS layer), after receiving the RRC Connection Reconfiguration message (step 903), starts at SgNB2 cell random access procedure for synchronization with the cells of SgNB2 (eg, Primary Secondary Cell (PSCell)) to. In some implementations, UE3 (ie, NR AS layer) may transmit the SI request in the random access procedure. For example, UE3 is first message (Msg1) random access procedure (ie, random access preamble) may transmit the SI requests. In this case, UE3 selects a random access preamble that is associated with the number or the identifier of the On-demand SI desired (Other SI) from the preamble pool may transmit the selected preamble. Alternatively, UE3 may send a SI request the third message of the random access procedure (Msg3).
[0054]
　Alternatively, in some implementations, after completion of the SCG DRB (or Split DRB) configuration, UE3 the cells of SgNB2 (eg, PSCell) (ie, AS layer NR) in, RRC signaling or Medium Access Control (MAC) Control Element the (CE) may transmit the SI request with.
[0055]
　Alternatively, in some implementations, after completion of the SCG DRB (or Split DRB) configuration, UE3 (ie, AS layer of E-UTRA) by using the RRC signaling in a cell of MeNB1 the SI request (eg, PCell) sent to MeNB1, MeNB1 may be forward SI requests received SgNB2.
[0056]

　configuration example of a wireless communication network of this embodiment is the same as FIG. Procedure present embodiment, send the Inter-RAT handover to NR from E-UTRA, the display of the available on-demand system information in the cell 21 of the target gNB2 the (indication) from the target gNB2 via the source eNB1 to UE3 to provide a concrete example of.
[0057]
　Target gNB2 according to the present embodiment, the Inter-RAT handover procedure to NR from E-UTRA, and the RRC message including the NR radio resource configuration is configured to send the UE3 through the source eNB1. The RRC message further includes a display of the available on-demand system information in a cell of the target gNB2 the (indication). The display shows at least an on-demand system information available in a cell of the target GNB2. Source eNB1 is an RRC message received from the target gNB2 is configured to forward to UE3 in the cell of the source eNB1. Thus, UE3, during the handover procedure to the target GNB2, either on-demand system information (ie, at least a part of Other SI) it is possible to know is available in a cell of the target GNB2.
[0058]
　Figure 10 is a sequence diagram showing an example of the (processing 1000) for Inter-RAT handover procedure according to the present embodiment. In step 1001, the source LTE eNB1 sends to the target gNB2 the NR Handover Request message on the direct inter-base-station interface 403 (eg, Xn interface or X3 interface). NR Handover Request message of step 1001 may include a handover type information element indicating (Handover Type Information Element (IE)) it is a handover from the LTE to the NR. Handover Type IE is, for example, "LTEtoNR" is set.
[0059]
　In step 1002, the target gNB2, based on NR Handover Request message, generates a UE context (the create), allocate resources. Then, the target gNB2 sends NR Handover Request Acknowledge message to the source eNB1. NR Handover Request Acknowledge message is a response message to the NR Handover Request message. NR Handover Request Acknowledge message includes a radio resource configuration of the target NR cell 21 generated by the target GNB2. The radio resource configuration is sent to the UE3 through the source eNB1. NR Handover Request Acknowledge message of step 1002 may further include a display of the available on-demand system information in a cell of the target gNB2 the (indication).
[0060]
　In step 1003, the source eNB1 sends a Handover Command message including a radio resource configuration information generated by the target gNB2 encompassing RRC message to the UE3. The RRC message, for example, may be a Mobility from EUTRA COMMAND message may be a RRC Connection Reconfiguration message. Source eNB1 is a radio resource configuration information generated by the target GNB2, it may be included in the "MobilityControlInfoNR" IE of RRC Connection Reconfiguration message. In addition, the source eNB1 was received from the target gNB2 a "display of the available On-demand SI" included in the RRC message to UE3. "Display available On-demand SI" may also be included in the "MobilityControlInfoNR" IE of RRC Connection Reconfiguration message.
[0061]
　In step 1004, UE3, in response to receiving the RRC message including Handover Command message, to move to the target RAN (ie, NR), to implement the handover in accordance with the radio resource configuration information supplied in Handover Command message. In other words, UE3 establishes a wireless connection with the target gNB2.
[0062]
　In step 1005, UE3, after successfully (successfully) synchronization with the target NR cell 21, and sends a Handover Confirm The for NR message to the target GNB2. Message of step 1005 may be a (NR) RRC Connection Reconfiguration Complete message.
[0063]
　UE3 (ie, NR AS layer) refers to the "display of available On-demand SI", UE3 wishes (or intended) whether Other SI is available in a cell of the target gNB2 the judges. UE3 is, RRC message (eg, (NR) RRC Connection Reconfiguration Complete message) in step 1005 may include SI request (SI request) to. SI request is a request for transmission of an on-demand system information for the target GNB2.
[0064]
　The transmission of the SI request in step 1005 of FIG. 10 is an example. UE3 (ie, NR AS layer) may transmit the SI request in the random access procedure in step 1004. . For example, UE3 is first message (Msg1) random access procedure (ie, random access preamble) may transmit the SI requests. In this case, UE3 selects a random access preamble that is associated with the number or the identifier of the On-demand SI desired (Other SI) from the preamble pool may transmit the selected preamble. Alternatively, UE3 may send a SI request the third message of the random access procedure (Msg3).
[0065]
　Then hereinafter, LTE eNB1 according to embodiments of the above, NR GNB2, and an example of the configuration of UE3 will be described. Figure 11 is a block diagram showing a configuration example of a NR GNB2 according to the embodiment described above. Configuration of LTE eNB1 may therewith may be similar as shown in Figure 11. Referring to FIG. 11, GNB2 is, Radio Frequency transceiver 1101, a network interface 1103, a processor 1104, and memory 1105. RF transceiver 1101 performs an analog RF signal processing for communicating with NG UEs including UE3. RF transceiver 1101 may include a plurality of transceivers. RF transceiver 1101 is coupled to the antenna array 1102 and the processor 1104. RF transceiver 1101 receives the modulated symbol data from the processor 1104, generates a transmission RF signal and provides a transmit RF signal to the antenna array 1102. Also, RF transceiver 1101 to generate a baseband received signal based on the reception RF signal received by the antenna array 1102, and supplies it to the processor 1104. RF transceiver 1101 may include an analog beamformer circuitry for beam forming. Analog beamformer circuit includes, for example, a plurality of phase shifters and a plurality of power amplifiers.
[0066]
　Network interface 1103 is used to communicate with a network node (eg, LTE eNB1, MME5, S-GW6). Network interface 1103 may include, for example, a network interface card that complies with the IEEE 802.3 series (NIC).
[0067]
　The processor 1104 performs control plane processing and digital baseband signal processing for wireless communication (data plane processing). Processor 1104 may include multiple processors. For example, the processor 1104 is a modem processor that performs digital baseband signal processing (eg, Digital Signal Processor (DSP)) and protocol stack processor for performing control plane processing (eg, Central Processing Unit (CPU) or Micro Processing Unit ( MPU)) may include. Processor 1104 may include a digital beamformer module for beamforming. Digital beamformer module, Multiple Input Multiple Output (MIMO) may include an encoder and precoder.
[0068]
　Memory 1105 is constituted by a combination of volatile and nonvolatile memory. Volatile memory may be, for example, Static Random Access Memory (SRAM) or Dynamic RAM (DRAM) or a combination thereof. The non-volatile memory, a mask Read Only Memory (MROM), Electrically Erasable Programmable ROM (EEPROM), flash memory, or hard disk drive, or any combination thereof. Memory 1105 may include a storage that is remotely located from the processor 1104. In this case, the processor 1104 may access the memory 1105 via the I / O interfaces that are not network interface 1103 or illustrated.
[0069]
　Memory 1105 may store one or more software modules (computer program) 1106 containing instructions and data for processing by gNB2 described in several embodiments described above. In some implementations, the processor 1104, the software module 1106 that reads out and executes from the memory 1105 may be configured to perform processing of gNB2 described in the above embodiments.
[0070]
　Figure 12 is a block diagram showing a configuration example of UE3. Radio Frequency (RF) transceiver 1201 performs an analog RF signal processing for communicating with the eNB1 and GNB2. RF transceiver 1201 may include a plurality of transceivers. Analog RF signal processing performed by the RF transceiver 1201 includes a frequency up-conversion, the frequency down-conversion, and amplification. RF transceiver 1201 is coupled to the antenna array 1202, and a baseband processor 1203. RF transceiver 1201 receives the modulated symbol data (or OFDM symbol data) from the baseband processor 1203, generates a transmission RF signal and provides a transmit RF signal to the antenna array 1202. Also, RF transceiver 1201 to generate a baseband received signal based on the reception RF signal received by the antenna array 1202, and supplies it to the baseband processor 1203. RF transceiver 1201 may include an analog beamformer circuitry for beam forming. Analog beamformer circuit includes, for example, a plurality of phase shifters and a plurality of power amplifiers.
[0071]
　Baseband processor 1203 performs control plane processing and digital baseband signal processing for wireless communication (data plane processing). Digital baseband signal processing, (a) data compression / decompression, (b) segmentation / concatenation of data, generation / decomposition of (c) transmission format (transmission frame), (d) transmission channel coding / decoding , including generation of (e) modulation (symbol mapping) / demodulation, and OFDM symbol data by (f) Inverse Fast Fourier Transform (IFFT) (baseband OFDM signal). On the other hand, the control plane processing, layer 1 (eg, transmission power control), Layer 2 (eg, radio resource management, and hybrid automatic repeat request (HARQ) process), and layer 3 (eg, attach, mobility and call management including communication management signaling) related.
[0072]
　For example, a digital baseband signal processing by a baseband processor 1203, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, may include a signal processing of the MAC layer, and the PHY layer. Further, the control plane processing by baseband processor 1203, Non-Access Stratum (NAS) protocol, RRC protocol, and may include a process of MAC CE.
[0073]
　Baseband processor 1203 may perform MIMO encoding and precoding for beamforming.
[0074]
　Baseband processor 1203 may include a modem processor that performs digital baseband signal processing (eg, DSP) and a protocol stack processor for performing control plane processing (eg, CPU or MPU). In this case, the protocol stack processor for performing control plane processing may be shared with an application processor 1204 which will be described later.
[0075]
　The application processor 1204, CPU, MPU, also referred to as a microprocessor or processor cores. The application processor 1204 may include a plurality of processors (multiple processor cores). The application processor 1204, a memory 1206 or illustrated which do not result system read from the memory a software program (Operating System (OS)) and various application programs (e.g., call application, WEB browser, a mailer, a camera operation application, music playback by running the application), to realize the UE3 various functions.
[0076]
　In some implementations, as indicated by the dashed line (1205) in FIG. 12, the baseband processor 1203 and an application processor 1204 may be integrated on a single chip. In other words, the baseband processor 1203 and an application processor 1204 may be implemented as a single System on Chip (SoC) device 1205. SoC devices, sometimes referred to as system Large Scale Integration (LSI) or chipset.

claims

A second radio access network (RAN) node for use in a wireless communication system,
　the second RAN node,
　a memory,
　and at least one processor coupled to said memory,
　comprising,
　at least one processor, the second display of the available on-demand system information in the cell of the RAN nodes (indication) via a first RAN node is configured to send to the wireless terminal,
　the available on-demand system information, the response to a request from the wireless terminal, the or is transmitted via the first RAN node in the second cell of the RAN node,
a second RAN node.
[Requested item 2]
　The second RAN node is associated with a second Radio Access Technology (RAT),
　the at least one processor, dual connectivity to the first and RAT as the primary RAT and the second RAT and secondary RAT the first radio Resource Control (RRC) to a message via the first RAN node associated with the first RAT sends to the wireless terminal including setting of the second RAT radio bearers for is configured,
　the display is included in the first RRC message,
the second RAN node according to claim 1.
[Requested item 3]
　The second RAN node is associated with a second Radio Access Technology (RAT),
　the at least one processor is for Inter-RAT handover of the wireless terminal to the second RAT from the first RAT is configured to send through the first RAN node a second RRC message associated with the first RAT to the including radio resource configuration of the second RAT to the wireless terminal,
　the display, the included in the second RRC message,
the second RAN node according to claim 1.
[Requested item 4]
　The display, the includes a display list or display the bitmap indicating the number or identifier of the available on-demand system information,
the second RAN node according to any one of claims 1-3.
[Requested item 5]
　A first radio access network (RAN) node for use in a wireless communication system,
　the first RAN node,
　a memory,
　and at least one processor coupled to said memory,
　comprising,
　at least one the processor
　is configured to display the available on-demand system information in the cell of the second RAN node (indication) received from the second RAN node, and
　the display cells of the first RAN node in configured to transmit to the radio terminal,
　the available on-demand system information, the response to a request from the radio terminal, via said second or said in the cell of the RAN node a first RAN node is the transmission Te
first RAN node.
[Requested item 6]
　The first RAN node is associated with a first Radio Access Technology (RAT),
　said at least one processor, dual connectivity to the first and RAT as the primary RAT and the second RAT secondary RAT the second first radio Resource Control, including the setting of the radio bearer RAT the (RRC) message received from the second RAN node associated with the second RAT, wherein the first RRC for message in cells of the first RAN node is configured to forward to the radio terminal,
　wherein the display is included in the first RRC message,
the first RAN node according to claim 5.
[Requested item 7]
　Wherein the at least one processor is
　in the setting procedure of radio bearers for the dual connectivity is configured to receive a second RRC message sent by the wireless terminal in response to said first RRC message ,
　the second RRC message retrieves the transmission request for on-demand system information from, the transmission request is configured to forward to the second RAN node,
a first RAN node according to claim 6.
[Requested item 8]
　The first RAN node is associated with a first Radio Access Technology (RAT),
　the at least one processor is for the first RAT of the wireless terminal Inter-RAT handover to a second RAT third the RRC message received from the second RAN node associated with the second RAT, the third said RRC message of a first RAN node of including radio resource configuration of the second RAT is configured to in a cell is forwarded to the wireless terminal,
　wherein the display is included in the third RRC message,
the first RAN node according to claim 5.
[Requested item 9]
　The display, the includes a display list or display the bitmap indicating the number or identifier of the available on-demand system information,
the first RAN node according to any one of claims 5-8.
[Requested item 10]
　A wireless terminal for use in a wireless communication system,
　said wireless terminal includes
　at least one radio transceiver configured to communicate with the first radio access network (RAN) node and a second RAN node,
　at least one one of the processors,
with a
　said at least one processor, displays a (indication) of the available on-demand system information in a second cell of the RAN node, via the first RAN node, the first is configured to receive from the second RAN node,
　the available on-demand system information in response to a request from the wireless terminal, the second or in the cell of RAN nodes the first RAN node It is transmitted over,
the wireless terminal.
[Requested item 11]
　Wherein the at least one processor is first including the setting of the second RAT radio bearers for dual connectivity to the first Radio Access Technology and (RAT) as the primary RAT and the second RAT secondary RAT the Radio Resource Control (RRC) message, the first through the first RAN node associated with RAT, is configured to receive from said second RAN node associated with a second RAT ,
　wherein the display is the included in the first RRC message,
the wireless terminal according to claim 10.
[Requested item 12]
　Wherein the at least one processor, said at setting procedure of the radio bearer for the dual connectivity, it is configured to transmit a second RRC message in response to said first RRC message,
　the second RRC message includes a request for transmission of an on-demand system information for the second RAN node,
the wireless terminal according to claim 11.
[Requested item 13]
　Wherein the at least one processor, after the reception of the first RRC message is configured to transmit a request for transmission of the second RAN node-on-demand system information in a random access procedure for synchronization with the cells of are,
the wireless terminal according to claim 11 or 12.
[Requested item 14]
　Wherein the at least one processor, after setting of the radio bearer of the second RAT for the dual connectivity, in the cell of the second RAN node, a request for transmission of an on-demand system information RRC signaling or Medium Access Control is configured to transmit using (MAC) Control Element (CE) ,
the wireless terminal according to claim 11 or 12.
[Requested item 15]
　Wherein the at least one processor is a third Radio Resource including radio resource configuration of the second RAT for the wireless terminals Inter-RAT handover from the first Radio Access Technology (RAT) to a second RAT Control the (RRC) message, the first through the first RAN node associated with RAT, is configured to receive from said second RAN node associated with a second RAT,
　the display is included in the third RRC message,
the wireless terminal according to claim 10.
[Requested item 16]
　The display, the includes a display list or display the bitmap indicating the number or identifier of the available on-demand system information,
the wireless terminal according to any one of claims 10-15.
[Requested item 17]
　A method in a second radio access network (RAN) node for use in a wireless communication system,
　a display of the method, the available on-demand system information in a second cell of the RAN nodes (indication) comprising sending to the wireless terminal via the first RAN node,
　the available on-demand system information in response to a request from the wireless terminal, or the first in the cell of the second RAN node It is transmitted through one of the RAN nodes,
method.
[Requested item 18]
　A method in a first radio access network (RAN) node for use in a wireless communication system,
　the method comprising
　the Show (indication) of the available on-demand system information in the cell of the second RAN node receiving from the second RAN node, and
　sending the display to the wireless terminal in the cell of the first RAN node,
it includes a,
　the available on-demand system information, the request from the wireless terminal in response to, and transmitted through the second or in the cell of RAN nodes the first RAN node
method.
[Requested item 19]
　A method in a wireless terminal for use in a wireless communication system,
　the method comprising displaying the available on-demand system information in the cell of the second radio access network (RAN) node (indication), first through the RAN node comprises receiving from the second RAN node,
　the available on-demand system information in response to a request from the wireless terminal, in the cell of the second RAN node or it is transmitted via the first RAN node
method.
[Requested item 20]
　The non-transitory computer readable medium storing a program for causing the method in the second radio access network (RAN) node for use in a wireless communication system to a computer,
　the method comprising the second RAN includes sending display possible on-demand system information used in the cell of the node (indication) to the wireless terminal via the first RAN node,
　the available on-demand system information from the wireless terminal in response to the request, the second in a cell of the RAN node or transmitted through the first RAN node,
a non-transitory computer readable media.
[Requested item 21]
　The non-transitory computer readable medium storing a program for causing the method in the first radio access network (RAN) node for use in a wireless communication system to a computer,
　the method comprising
　the second RAN node display of the available on-demand system information in the cell (indication) to receive from the second RAN node, and
　, transmitting to the wireless terminal in the cell of the display the first RAN node
includes a ,
　the available on-demand system information, the response to a request from the wireless terminal, the second is transmitted over the or the first RAN node in the cell of the RAN node,
a non-transitory computer-readable media.
[Requested item 22]
　The non-transitory computer readable medium storing a program for causing a method in a wireless terminal for use in a wireless communication system to a computer,
　in the method, the second radio access network (RAN) cells node display of the available on-demand system information (indication), via the first RAN node comprises receiving from the second RAN node,
　the available on-demand system information, the wireless in response to a request from the terminal, the second in a cell of the RAN node or transmitted through the first RAN node,
a non-transitory computer readable media.