Technical field
[0001]
　The present application relates to wireless communication systems and, more particularly, to operation of the wireless terminal in a situation where competing cell identifier (conflict The) is occurring.
Background technique
[0002]
　The following section describes the 3rd Generation Partnership Project (3GPP) Release (called Long Term Evolution (LTE)) 8 and a radio frame (radio frame) structure used in later, then, the 3GPP Release 10 (LTE-Advanced It will be described carrier aggregation introduced in referred to) (carrier aggregation (CA)). Furthermore, Licensed Assisted Access being discussed currently with respect to 3GPP Release 13 (LAA), and associated Licensed Shared Access for (LSA) will be described.
[0003]
　First it will be described a radio frame structure of LTE. In 3GPP Release 8 and later, two radio frame structure is prepared. One is called a frame structure type 1, it can be applied to frequency division duplex (FDD). The other is called a frame structure type 2, applicable to Time division duplex (TDD). As shown in Figure 16, in any of the frame structure of the type 1 and type 2, the length of one radio frame is 10 ms, from one radio frame 10 subframes (subframe) It is configured. In the case of TDD, the first half of the five subframes (# 0 ~ # 4), referred to as the second half of the five subframes (# 5 to # 9) respectively half-frame. The length of the half-frame is 5 milliseconds. The length of one subframe is 1 ms. One more sub-frames, each of which is decomposed into two slots of 0.5 ms. For Normal Cyclic prefix, 1 single slot, if 7 symbols (uplink in the time domain single carrier frequency division multiple access (SC-FDMA) symbols, if the downlink orthogonal frequency division multiplexing (OFDM) symbol )including. Therefore, one sub-frame includes 14 symbols in the time domain.
[0004]
　Further, in 3GPP Release 10, the radio base station (eNode B: eNB) and a radio terminal (User Equipment: UE) has a plurality of cells carrier aggregation communicate using (Carrier Aggregation: CA) Specification row functions We were. Incidentally, UE cell available in CA is limited to a plurality of cells of one eNB (i.e., multiple cells that operate or managed by eNB). The cells used by the UE in CA, primary cell that is already used as a serving cell at the time of starting the CA (Primary cell: PCell) and, additionally or dependent-used secondary cell (Secondary cell: SCell) It is classified in. In PCell, wireless connection (re) establishment (Radio Resource Control (RRC) Connection Establishment, RRC Connection Re-establishment) during, Non Access Stratum (NAS) mobility information (NAS mobility information) and security information (security input The) There are transmitted and received (see section 7.5 of non-Patent Document 1).
[0005]
　Although functionally the introduction of CA has become possible to realize a high-speed communication, by restriction of frequencies allocated to each operator in actual operation (insufficient), concern for an increase in the future additional mobile traffic the remains at present. Therefore, in the 3GPP standardization, unlicensed frequency (Unlicensed frequency band, Unlicensed spectrum) discuss the Unlicensed LTE that performs the LTE using a (referred to as LTE-U is also. Later called LTE-U or U-LTE) is has been started (non-Patent documents 2 and 3).
[0006]
　The implementation method of the LTE-U, in conjunction with license frequency (e.g. as SCell of CA), and Licensed Assisted Access to eNB at unlicensed frequency to communicate with UE (LAA), the UE only unlicensed frequency communication two ways of Standalone (SA) for performing is considered. Here, as the unlicensed frequency, for example, is assumed 5GHz band, the 5GHz band, radar systems and wireless LAN to other: a frequency which is also used (Wireless LAN WLAN.WiFi also called). Therefore, SA scheme to perform communication only in unlicensed frequency, there is concern about the feasibility of delicate control specified in LTE, feasibility (also referred to as LA-LTE) higher LAA method is studied It has been with the center. In the following, it will be described with attention by the LAA method of performing CA license frequency and non-licensed frequency to LTE-U. Note that the license frequency refers to dedicated frequency assigned to a specific operator. Also, the non-license frequency refers to a shared frequency assigned to a frequency or a plurality of operators, not assigned to a specific operator. In the latter case, the frequency is instead called unlicensed frequency, sometimes also called license sharing frequency, communication using the frequency is also referred to Licensed Shared Access (LSA). Later, the collectively referred to unlicensed frequency of these frequencies other than licensed frequencies licensed only to a specific operator.
[0007]
　LTE-U by LAA method is performed according to the sequence shown in fundamentally FIG. Here, eNB is in Cell # 2 of Cell # 1 and unlicensed frequency license frequency, a case of performing data transmission (or reception) with the UE # 1. First, the wireless connection between the eNB and the UE # 1 in Cell # 1 is established (RRC Connection Establishment, 1501), further a core network: bearer is established between the (Evolved Packet Core EPC) and UE # 1 ( not shown). That, Cell # 1 is the PCell of UE # 1. eNB, if there is downlink to be transmitted to UE # 1 (DL) · user data (also referred to as User Plane (UP) data), or UE # 1 If there is uplink (UL) · user data to be transmitted , the user data transmitted and received in Cell # 1 (DL (or UL) UP data transmission, 1502).
[0008]
　Then, eNB, when UE # 1 determines that it is effective to transmit and receive user data in Cell # 2 at some point (Trigger LTE-U for UE # 1, 1503), in Cell # 1 Cell # transmitting control information about the second radio resource configuration to UE # 1 (radio resource Configuration for Cell # 2, 1504). The control information corresponds to RadioResourceConfigDedicated Information Element (IE) and RadioResourceConfigCommon IE transmitted at RRC Connection Reconfiguration message in LTE (Non-Patent Document 4). In this case, Cell # 2 is the SCell of UE # 1. When transmitting user data in downlink, eNB can, Cell # perform sensing at 2, the Cell # 2 determines whether available (Perform channel sensing, 1505). eNB, when judging that Cell # 2 is available, to transmit and receive user data to and from the UE # 1 (DL (or UL) UP data transmission, 1506). Thus, improvement in the unlicensed frequency further by using the throughput, or increase in cell capacity can be expected.
[0009]
　Incidentally, sensing the above, Listen the Before Talk (LBT) and is also known (Non-Patent Document 2), in a non-licensed frequencies of interest, a communication by LTE-U or other wireless system (eg WLAN) according to other operators It intended to determine whether taking place in nearby, Channel for radar system Availability Check (CAC), and corresponds such a Clear Channel Assessment performed in Access Point (AP) in WLAN (CCA) (Patent Document 1 ).
CITATION
Non-patent literature
[0010]
非特許文献1 : 3GPP TS 36.300 V12.2.0 (2014-06), “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 12)”, 2014年6月
非特許文献2 : 3GPP RP-131635, “Introducing LTE in Unlicensed Spectrum”, Qualcomm, Ericsson, 2013年12月
非特許文献3 : 3GPP workshop on LTE in unlicensed spectrum, RWS-140002, “LTE in Unlicensed Spectrum: European Regulation and Co-existence Considerations”, Nokia, 2014年6月
非特許文献4 : 3GPP TS 36.331 V12.2.0 (2014-06), “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 12)”, 2014年6月
非特許文献5 : 3GPP TR 36.842 V12.0.0 (2013-12), “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on Small Cell enhancements for E-UTRA and E-UTRAN; Higher layer aspects (Release 12)”, 2013年12月
Summary of the Invention
Problems that the Invention is to Solve
[0011]
　In LAA, it is necessary also in the cells of the unlicensed frequency Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) is transmitted. UE by detecting the PSS and SSS transmitted in unlicensed frequency cell, can be synchronized to the cells of the unlicensed frequency (i.e., it is possible to detect the position of the 10ms radio frame boundary), non it is possible to detect the Physical cell Identity of cell license frequency (PCI).
[0012]
　However, the LAA, which may be due to the cells of two unlicensed frequencies operated by different operators use the same PCI PCI contention (conflict The) occurs. PCI of conflict (conflict) is, including the PCI collision and PCI confusion. PCI collision is close to (e.g., adjacent) two cells means use the same PCI, PCI confusion, respectively there are two cells having the same PCI around of a cell (e.g., in the cell It means having an adjacent cell).
[0013]
　For example, as shown in FIG. 18, UE93 is other operators with operator itself belongs cells provided by eNB91 in (operator A) (Cell # 2) same PCI (PCI # 5) (operator B) cell (cell # 3) detects erroneously performs terminal measured for cell # 3 of operator B (ie, the measurement of the Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ)), cell # it may incorrectly report the serving cell (cell # 1) in ENB91 3 of the measurement results as the terminal measurement results relating to Cell # 2. Then, ENB91, based on the terminal measurement results might result in setting the Cell # 2 to the UE93 to start the CA. Then, UE93 may not be able to obtain sufficient communication quality in Cell # 2.
[0014]
　Even though if PCI contention (conflict The) happened among the plurality of cells, UE makes these cells by detecting the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Cell Global ID (ECGI) distinction (distinguish, differentiate, or discriminate) can might be. ECGI is an identifier for uniquely identifying the E-UTRAN cell global. However, in the unlicensed frequency of cells used as a secondary cell for carrier aggregation including ECGI System Information Block type 1 (SIB1) it may not be transmitted by LAA. Therefore, if the cell of the unlicensed frequency (or license shared frequency) is used as a secondary cell for carrier aggregation (SCell) in LAA (also LSA), UE has to the cells be distinguished from other cells based on ECGI it may be difficult.
[0015]
　Incidentally, PCI contention (conflict The) is in many situations not only situations (Situations) used for LAA multiple LTE operators unlicensed frequency (or license shared frequency) as described above (or LSA) It may occur. PCI contention (conflict The), i.e. PCI collision or PCI confusion is unlicensed frequency, it may also occur if the license shared frequency, and any license frequencies are used, among a plurality operators, and one in the operators there is a possibility that originate from either. Furthermore, PCI confusion is to use a frequency in which a plurality of cells are different, there can also occur if they are using the same PCI. Furthermore, PCI is an example of a cell identifier (physical identifiers). On non-LTE system, but different from the cell identifier is used as the PCI (e.g., Primary Scrambling Code used in 3GPP Universal Mobile Telecommunications System (UMTS) (PSC)), PCI contention (conflict The) Like the competition of these other cell identifier may also be generated.
[0016]
　Therefore, one of the objective to be achieved is the embodiments disclosed herein, in situations where a plurality of cells use the same cell identifier (eg, PCI), you can distinguish the plurality of cells in a wireless terminal It contributes device to way is to provide a method, and a program. This purpose should embodiment disclosed herein is noted that only one of a plurality of objects to be achieved. 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
[0017]
　In a first aspect, the wireless terminal, and at least one processor coupled memory and to said memory. Wherein the at least one processor, based on a predetermined relationship between the frame timing of the first cell using the frame timing and unlicensed frequency of the first serving cell that uses a license frequency, the first in the unlicensed frequency It is configured to perform a predetermined process relating to the cell.
[0018]
　In a second aspect, the radio station, and at least one processor coupled memory and to said memory. Wherein the at least one processor, information regarding an offset between the frame timing of the second cell is operated in an unlicensed frequency and frame timing of the first cell to be operated in licensed frequency by the radio station by the radio station It transmits the setting information including a radio terminal, is configured to transmit the control information relating to a predetermined process performed in the wireless terminal by the wireless terminal with respect to the unlicensed frequency.
[0019]
　In a third aspect, a method performed by the wireless terminal, based on a predetermined relationship between the frame timing of the first cell using the frame timing and unlicensed frequency of the first serving cell that uses a license frequency, wherein It comprises performing a predetermined process relating to the first cell in the unlicensed frequencies.
[0020]
　In a fourth aspect, the method includes a frame timing of the second cell to be operated in an unlicensed frequency and frame timing of the first cell to be operated in licensed frequency by the radio station by the radio station to be performed by the radio station includes transmitting configuration information including information about the offset between transmitting to the wireless terminal, and the control information relating to a predetermined processing performed by the wireless terminal to an unlicensed frequency to the radio terminal with .
[0021]
　In a fifth aspect, the program includes the when loaded into a computer, instructions for performing the method according to the third aspect described above to a computer (software code).
[0022]
　In a sixth aspect, the program includes the when loaded into a computer, instructions for performing the method according to the fourth aspect described above to a computer (software code).
Effect of the Invention
[0023]
　According to the embodiments described above, provided in the context in which a plurality of cells use the same cell identifier (eg, PCI), which contributes device to ensure that the plurality of cells can be distinguished in the wireless terminal, method, and program it can.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024]
Is a diagram illustrating a configuration example of a wireless communication system according to FIG. 1A] Some embodiments.
It is a diagram illustrating a configuration example of a wireless communication system according to FIG. 1B] Some embodiments.
It is a diagram illustrating a configuration example of a wireless communication system according to FIG. 2 some embodiments.
3 is a flowchart illustrating an exemplary operation of the wireless terminal according to the first embodiment.
4 is a flowchart illustrating an exemplary operation of the wireless terminal according to the second embodiment.
It is a [5] serving cell and the timing diagram showing an example of the relationship between frame timings between other cells.
Is a timing diagram showing an example of the relationship between the frame timing between [6] the serving cell and other cells.
7 is a timing diagram showing an example of the relationship between the frame timing between the serving cell and other cells.
8 is a sequence diagram showing an example of a procedure of notifying an offset value from the radio base station to the wireless terminal.
9 is a flowchart illustrating an exemplary operation of the wireless terminal according to the second embodiment.
FIG. 10 is a flowchart illustrating an exemplary operation of the wireless terminal according to the third embodiment.
11 is a flowchart illustrating an exemplary operation of the wireless terminal according to the fourth embodiment.
It is a diagram illustrating a configuration example of a wireless communication system according to FIG. 12 with some embodiments.
It is a diagram illustrating a configuration example of a wireless communication system according to FIG. 13 with some embodiments.
It is a block diagram showing a configuration example of a radio terminal according to FIG. 14 with some embodiments.
Is a block diagram showing a configuration example of a radio base station according to FIG. 15 with some embodiments.
16 is a diagram illustrating a radio frame structure and subframe structure of LTE.
17 is a sequence diagram showing an example of operation of the radio base station and wireless terminal in LTE-U.
It is a diagram for FIG. 18 a plurality of cells illustrating an example of a UE operating in the context of using the PCI.
DESCRIPTION OF THE INVENTION
[0025]
　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.
[0026]
　The following several embodiments shown in will be described an Evolved Packet System (EPS) that houses the LTE and SAE (System Architecture Evolution) as a main target. However, these embodiments are not intended to be limited to EPS, other mobile communication networks or systems, for example 3GPP UMTS, 3GPP2 CDMA2000 systems (1xRTT, HRPD (High Rate Packet Data)), global system for mobile communications ( GSM (TM)) / General packet radio service (GPRS) system, and may be applied to WiMAX systems.
[0027]

　First, unlicensed frequency (Unlicensed frequency band, Unlicensed spectrum) of several embodiments including this embodiment is directed for some examples of Unlicensed LTE utilizing explained. Here, Unlicensed LTE is also referred to as LTE-U or U-LTE, the following discussions describe an LTE-U. Further, the unlicensed frequency, for example at a frequency which is also used in the radar system and a wireless LAN (also called WLAN.WiFi), particular operator (i.e., service provider) frequencies other than licensed frequencies allocated only points. The unlicensed frequencies, for example, 5 GHz band is assumed, which are not limited. Furthermore, a plurality of embodiments described below, a plurality of shared frequency (Shared frequency band, Shared spectrum) allocated in common to the operator it is needless to say also applicable in. In the following, these are collectively of a frequency other than the license frequency is referred to as a non-licensed frequency.
[0028]
　1A and 1B are views showing a configuration example of a radio communication system and other systems of the LTE-U in which a plurality of embodiments is intended to include this embodiment. In the example of FIG. 1A, the wireless communication system includes a LTE radio base station (eNB) 11 and a wireless terminal (UE) 3. eNB11 and UE3 is a licensed frequency (F1) is configured to perform communication by ordinary LTE, employed are configured to perform communication by LTE-U at unlicensed frequency (F2). In the example of FIG. 1B, in addition to the example of FIG. 1A, LTE eNB 11 manages the remote base station 12 (RRH or RRE), performs communication by LTE-U at unlicensed frequency (F2) by the remote base station 12 .
[0029]
　Arrangement of Figure 1A and 1B may coexist on the same system. Further, FIGS. 1A and 1B, shows only a portion of a wireless communication system assumed, actually exists eNB11, RRH / RRE12, and a plurality of eNB and RRH / RRE and a plurality of UE around the UE3 the cell of the plurality of license frequencies is managed by the plurality of eNB and RRH / RRE. Furthermore, eNB11, RRH / RRE12, and there may be multiple wireless LAN access points around the UE3 (WLAN AP) and a plurality of wireless LAN terminals (WLAN Terminal). In the following description, referred to as a wireless base station 1 or LTE-U eNB1 are collectively eNB having the function of LTE-U. In other words, the radio base station 1 or LTE-U eNB1, in the arrangement of FIG. 1A correspond to eNB11, in the configuration of FIG. 1B correspond to eNB11 and RRH / RRE12. For convenience of explanation, sometimes called the radio base station 1 or LTE-U eNB1 points to only the nodes corresponding to the RRH / RRE12 configuration of FIG 1B.
[0030]
　In the above and following descriptions, it is assumed that LTE-U are realized LAA (also referred to as LA-LTE). As already mentioned, the LAA, the radio base station (LTE-U eNB) 1 and a wireless terminal (UE) 3 is the cells of the cell and unlicensed frequency license frequencies carry aggregation (CA), cells of the license frequency with use as a primary cell (PCell), using a cell of the unlicensed frequency as a secondary cell (SCell). As already mentioned, LTE-U, instead of being performed in an unlicensed frequency sharing frequencies assigned to a plurality of operators (service providers) (Shared frequency band, Shared spectrum) may be performed in. In this case, LTE-U may be implemented by the above LAA or similar manner. Alternatively, LTE-U eNB1 and UE3 includes a plurality of (e.g., two F3 and F4) performs CA using a shared frequency, perform a normal LTE one shared frequency (F3) as PCell, other one shared frequency (F4) may be executed the LTE-U as SCell. As already mentioned, LTE-U in a shared frequency is especially also known as Licensed Shared Access (LSA). Furthermore, LTE-U eNB1 The UE3, use shared frequencies assigned to a plurality of operators (e.g. F3), any operator is not assigned narrow unlicensed frequency (e.g. F2, for example, 5GHz band) to perform a CA, perform a normal LTE shared frequency (F3) as PCell, may execute the LTE-U a narrow unlicensed frequency (F2) as SCell.
[0031]
　Figure 2 shows an example of a situation in which a plurality of cells provided by the different LTE operator uses the same PCI. In the example of FIG. 2, LTE-U eNB1 is managed by the operator A, the Cell # 1 operate in the license frequencies F1, it operates a Cell # 2 in unlicensed frequency F2. Cell # 2 has a PCI # 5. On the other hand, LTE-U eNB2 is the operator A is managed by a different other operators B, and operates a Cell # 3 in unlicensed frequency F2. In the example of FIG. 2, because of its Cell # 2, and Cell # 3 is and the same PCI # 5 adjacent to each other, there is a possibility that PCI collision occurs in LTE-U eNB1 and UE3. Incidentally, Cell # 2, and Cell # 3 have the same PCI # 5 is not adjacent to one another may be disposed so that each is adjacent to Cell # 1, PCI in this case in the LTE-U eNB1 confusion there is likely to occur.
[0032]
　UE3 according to the present embodiment, using a plurality of cells (eg, Cell # 2, and Cell # 3) is the same PCI (eg, PCI # 5) and the same frequency (eg, F2) as shown in FIG. 2 in the set conditions to operate as follows in order to distinguish the plurality of cells. That, UE3, the same PCI (eg, PCI # 5) to one another and the same frequency (eg, F2) a plurality of cells that are set to use (eg, Cell # 2, and Cell # 3), serving cell ( eg, it is configured to distinguish, based on the relationship between each of the frame timing of the cell # 1) of the frame timing and the plurality of cells (eg, cell # 2, and cell # 3). In other words, the same PCI (eg, PCI # 5) and the first cell (eg, Cell # 2) using the same frequency (eg, F2) and a second cell (eg, Cell # 3) is present If you, UE3 is the first cell (eg, cell # 2) frame timing and a serving cell (eg, cell # 1) on the basis of the relationship between the frame timing of the first cell (eg, cell # 2) a second cell (eg, cell # 3) is configured to distinguish. Incidentally, the term frame timing in the present embodiment and other embodiments, the wireless terminal in (eg, UE3) timing receiving the head (frame boundaries) of the radio frame or subframe, or the wireless base station (eg, eNB1 ) from the radio frame or sub-frame head (frame boundary) it may mean when to send. Alternatively, the term frame timing synchronization signals in a wireless terminal (eg, PSS, SSS) timing has been received, or the radio base station synchronization signals (eg, PSS, SSS) may mean when to send .
[0033]
　Figure 3 is a flow chart illustrating an example (the process 300) of the processing performed by the UE3. At block 301, UE3 detects the PCI and the frame timing of Cell # 2 in unlicensed frequency (F2). In block 302, based on the relationship between the frame timing of Cell # 2 of the frame timing and the serving cell (Cell # 1), distinguishes Cell # 2 from Cell # 3 having the same PCI and Cell # 2.
[0034]
　Relationship frame timing, in one example, a frame timing difference between that of the unlicensed frequency of cells received at the UE3 (eg, Cell # 2 or Cell # 3) of the radio frame and the serving cell (eg, Cell # 1) it may be a (frame timing difference). That is, the same PCI (eg, PCI # 5) and the same frequency (eg, F2) a plurality of cells that are set to use (eg, Cell # 2, and Cell # 3) are each between serving cell It is distinguished by having different frame timing difference. Frame timing difference, the head position of the radio frame unlicensed frequency of cells received at the UE3 (i.e., a radio frame boundary (frame boundary)) may be defined as the difference between that of the serving cell and. More specifically, frame timing differences, the head position of the radio frame unlicensed frequency of cells received at the UE3 (i.e., a radio frame boundary (frame boundary)) time difference with that of the serving cell and (eg, N nanoseconds it may be defined as M microseconds). Alternatively, the frame timing difference may be defined as the difference between that of the sub-frame number and the serving cell of the unlicensed frequency of cells received at the same observation time in UE3. Alternatively, the difference in frame timing, synchronization signal unlicensed frequency of cells received at the UE3 (eg, PSS, SSS) and the sub-frame which is transmitted may be defined as the time difference between that of the serving cell.
[0035]
　Incidentally, frame structure (i.e., duplex mode (FDD or TDD)) in the serving cell and non-licensed frequency cell if different, it may be considered the difference. That is, both the first synchronization signal (PSS) and a second synchronization signal (SSS) is first subframe (subframe # 1) and the sixth subframe (subframe # 6) at a point to be transmitted same regardless of the frame structure, but actually the radio resources PSS and SSS are transmitted slightly different between frame structure. For example, in the case of frame structure type 1 (FDD), a first synchronization signal (PSS) is transmitted in slot # 0 and slot # 10 each of the last OFDM symbol, if frame structure type 2 of (TDD) , the first synchronization signal (PSS) is transmitted in subframe # 1 and subframe # 6 respectively of the third OFDM symbol. In contrast, in the case of frame structure type 1 (FDD), a second synchronization signal (SSS) is transmitted in slot # 0 and slot # 10, when the frame structure type 2 (TDD), the second of the synchronization signal (SSS) is transmitted in slot # 1 and slot # 11. Thus, timing information (e.g., the difference between the frame timing of the above) the finer sub-frame (1 ms) Accuracy (e.g., microseconds) when derived in may consider the differences between the frame structure.
[0036]
　In another example, the relationship of the frame timing may be a difference of System Frame Number of cells and serving unlicensed frequency (SFN). SFN is a number between 0 and 1023 granted sequentially in a radio frame. SFN is the upper 8 bit, by decoding the Physical Broadcast Channel (PBCH) comprising Master Information Block (MIB) can be obtained by two UE3. Furthermore, it is possible to receive the MIB (i.e. PBCH) which is repeatedly transmitted to the lower 4 bit every 10 ms, by recognizing the repetitive timing may resemble UE3. In this case, the same PCI (eg, PCI # 5) and the same frequency (eg, F2) a plurality of cells that are set to use (eg, Cell # 2, and Cell # 3) has different SFN mutually It is distinguished by.
[0037]
　As understood from the above description, UE3 according to the present embodiment, a plurality of cells are the same cell identifier (eg, PCI) even in a situation that use of each of the plurality of cell frames timing and serving cell it is possible to distinguish between these plurality of cells based on the relationship with it.
[0038]

　In the present embodiment, another example of a process performed by the UE and the eNB are described. Configuration example of a wireless communication system according to this embodiment, FIG. 1A described with respect to the first embodiment is the same as FIG. 1B, and FIG.
[0039]
　Figure 4 is a flow chart illustrating an example (the process 400) of the processing performed by the UE3. In block 401, UE3, the frame timing is attempted in the serving cell (Cell # 1) cell (EG, Cell # 2) having a predetermined relation between the frame timing of detecting the unlicensed frequency (F2).
[0040]
　In one example, the predetermined relationship relating the frame timing, unlicensed frequency of cells received at the UE3 (eg, Cell # 2 or Cell # 3) the head position of the radio frame (radio frame boundary) is serving (eg, Cell # at the same may be to have substantially aligned (aligned) 1). Head position of the radio frame of the two cells is "are substantially aligned" It may also be called a radio frame of these two cells are substantially synchronized. Head position of the radio frame of the two cells is "are substantially aligned" means that the time difference is a predetermined threshold value of the head position of the radio frame of the two cells that are received at the UE3 (eg, several tens of microseconds to several one hundred may be determined by at microseconds) within. Alternatively, "substantially are aligned" means that it is within the observation period (eg, 1 sub-frame period = 1 millisecond) to the sub-frame numbers of the two cells that are received at the UE3 are identical it may be determined by the.
[0041]
　Figure 5 shows an example of the relationship between the frame timing between the serving cell and other cells. In the example of FIG. 5, the head position of Cell # 2 of radio frame received in UE3 is aligned therewith substantially in the serving cell (Cell # 1). On the other hand, the head position of the radio frame of Cell # 3 is not aligned with that of the serving cell (Cell # 1). Thus, in the example described above, UE3 is the Cell # 2 shown in FIG. 5 subjected to predetermined processing. Meanwhile, UE3 that if the cell of the unlicensed frequency unless aligned with that frame timing (eg, Cell # 3 shown in FIG. 5) serving cell (Cell # 1), given the cell (Cell # 3) It does not take into account as of the processing of the target (candidate).
[0042]
　Incidentally, UE3, the frame timing of the unlicensed frequency cell that can be used as a secondary cell in LAA assumption that is aligned with that of the serving cell, the cells to be subjected to predetermined processing in unlicensed frequency (candidate) it may be trying to detect. This, UE3 is, control information (eg, measurement configuration for Unlicensed frequency / band) that triggers the detection of unlicensed frequency when received from the LTE-U eNB1 to, LAA in unlicensed frequency specified by the control information in frame timing of the available cells as secondary cell attempts to cell detection on the assumption that you have to that of the serving cell, can also be referred to. Here, the serving cell, may be the PCell, to may be PCell similar cells (e.g., Dual Connectivity PSCell), may be a serving cell for a given cell group, may be further all serving cell of the radio terminal.
[0043]
　In another example, the predetermined relationship relating the frame timing, in addition in particular the head position of the unlicensed frequencies and the serving cell of the radio frame received in UE3 are aligned substantially (radio frame are synchronized), it may be that these two cell System Frame Number (SFN) are identical. SFN, as already mentioned, is a number between 1023 0 granted sequentially in a radio frame.
[0044]
　In yet another example, the predetermined relationship relating the frame timing, frame timing (e.g., the head position or the radio frame boundary of the radio frame of the unlicensed frequency of cells received at the UE3 (eg, Cell # 2 or Cell # 3) ) is serving (eg, Cell # 1) of the contrast that fall within a predetermined first offset, or the first that not fit in offset may be. In this case, for example, UE3, attempts to detect cells in unlicensed frequency, whether the detected cell satisfies a predetermined relationship (that is, whether or not fit within the first offset, or within first offset It determines whether) or not fit in, if they meet the predetermined relationship (only) may be the detected cell as the object of predetermined processing.
[0045]
　Here, the value of the predetermined first offset, the head position of the radio frame of the two cell time difference (radio frame boundary) (eg, X msec) may be defined by, within a certain observation period (eg, the difference of the sub-frame number of the two cells that are received in one sub-frame period = 1 millisecond) (eg, may be defined by Y subframes). The value of the predetermined offset may be a positive value may be a negative value. Incidentally, the value of the predetermined offset is zero, the head position of the radio frame of the two cells (or radio frame boundary) means that you have substantially.
[0046]
　Figure 6 shows an example of the relationship between the frame timing between the serving cell and other cells. In the example of FIG. 6, the head position of Cell # 2 of radio frame received in UE3 is in then only about one subframe time offset of the serving cell (Cell # 1). In other words, it is also possible difference lies in the observation period subframe number to be received (eg, 1 sub-frame period = 1 millisecond) is said to be +1. When a predetermined first offset is set to one sub-frame (or the difference between the sub-frame number = 1), UE3 can be selected Cell # 2 shown in FIG. 6 as an object of predetermined processing good.
[0047]
　In yet another alternative embodiment, the predetermined relationship relating the frame timing, frame timing unlicensed frequency of cells received in UE3 (e.g., head position or the radio frame boundary of the radio frame) predetermined with respect to that of the serving cell it may be that is offset by the second offset. In this case, for example, UE3, when attempting to detect the cell at unlicensed frequency, frame timing of the cell to be detected is assumed that there is a second offset relative to that of the serving cell at the corresponding detection timing it may be try to detect the cell in unlicensed frequency. The value of the second offset may be similarly defined as the value of the first offset.
[0048]
　Figure 7 shows an example of the relationship between the frame timing between the serving cell and other cells. In the example of FIG. 7 shows the Cell # frame timing of 2 and Cell # 3 that can be received in the UE3. Here, the cell that can be received at UE3, refers to a cell that if the position of the UE3 reception quality of the cell (eg, RSRP) is assumed to be sufficient for cell detection. Head position of the radio frame of Cell # 2 is offset only that about 4 sub-frame time of the serving cell (Cell # 1). In other words, it is also possible difference lies observation period in a sub-frame number to be received (eg, 1 sub-frame period = 1 millisecond) is said to be +6. On the other hand, the head position of the radio frame of Cell # 3 is shifted then about 7 subframe time of the serving cell (Cell # 1). In other words, it is also possible difference lies observation period in a sub-frame number to be received (eg, 1 sub-frame period = 1 millisecond) is said to be +3. When a predetermined second offset is set to 4 sub-frame (or the difference between the sub-frame number = 6), UE3 can be selected Cell # 2 shown in FIG. 7 as an object of predetermined processing good. Incidentally, in the example of FIG. 7, the detection of the predetermined processing cell (i.e., cell search) if it is, assuming that there is a second offset, but attempts to detect a Cell # 2, Cell # 3 is not subject to the detection of the cell can not be detected in the second offset.
[0049]
　In yet another example, the predetermined relationship relating the frame timing, unlicensed frequency of cells received at the UE3 (eg, Cell # 2 or Cell # 3) radio frame number (i.e., SFN) is serving (eg, Cell # 1) of the contrast that fall within a predetermined first offset, or the first that not fit in the offset, or a predetermined second offset (eg, that are shifted Z radio frames the) only, it may be.
[0050]
　Continuing with the description back to FIG. 4. At block 402, UE3 performs predetermined processing on detected cells at block 401. Predetermined process may include at least one of the process listed below.
Cell search process (cell search)
cell selection process (cell selection)
, cell re-selection process (cell reselection)
proximity to cell sense (proximity estimation)
of the proximity to the cell reporting (proximity indication)
- terminal measurement (RRM measurement)
of-terminal measurement reports (RRM measurement report)
, the radio quality measurement (CQI measurement)
- wireless quality measurement result report (CQI report)
, the channel state measurement (CSI measurement)
of - the channel state measurements report (CSI report)
· Sensing (CCA, Energy Detection)
[0051]
　To a certain cell and the target cell search processing means to select a series of PSS and SSS in the cell as a candidate of a search in the cell search function. Cell search process, at least one of the following may be searched whether the cell is present (search) that for the purpose of:
(a) be used as a serving cell (eg SCell),
(b ) to confirm whether or not the cell of the other operators are present,
(c) interference measurements from the cells of other operators (inter-operator measurement, inter- operator cell interference measurement, inter-network measurement, or inter- network interference Measurement) be performed, and
(d) sensing (eg CCA, energy detection) be performed.
[0052]
　Detection of the proximity to the cell, for example at least one of the objects of the above (a) ~ (d), whether the target cell is present in the neighborhood (nearby), UE3 autonomously check (estimated) it may be to. Detection of the proximity to the cell (proximity) is estimated (proximity estimation) proximity to the cell, the detection of the availability of the cell (cell availability), or may be simply referred to as detection cell (cell discovery). Detection of the proximity to non-attribution cells (non-serving cell) in an unlicensed frequency due UE3 (proximity), for example, a cell-specific signal transmitted in the non-attribution cell radio base station from (LTE-U eNB) 1 and detecting. Cell specific signal includes a known symbol or a known sequence. Cell-specific signal, for example, (in Synchronization Signal.LTE, PSS and SSS) synchronization signal or a reference signal (Reference Signal: RS) may be the basic information to be broadcast in the cell (Master Information Block: MIB) or system information (System information Block:. SIB e.g. SIB1 or SIB 2, or SIBx defined for LTE-U) may be used. In this case, UE3, for example the cell reception quality of a particular signal (eg, RS) (eg, RSRP, RSRQ, RSSI, SINR, or CQI) is (whether greater than or threshold) predetermined threshold or whether it may detect proximity to the non-attribution cells based on. Alternatively, UE3, based on whether or not it has received correctly the basic information to be broadcast (MIB) or system information (SIB) in the non-attribution cells, be detected proximity to the non-attribution cells good. The reference signal is, for example, cell-specific reference signal (Cell Specific RS: CRS), channel state information (Channel State Information: Measurement report for the reference signal CSI) (CSI RS), and the cell detection of the reference signal (Discovery RS: DRS) may include at least one of. DRS, for example PSS, SSS, CRS, and may be a combination of two or more of CSI RS, it may be newly defined reference signal for cell detection.
[0053]
　Report of the proximity to a cell involves reporting the results of detection of proximity to the aforementioned cell license frequency serving cell (eg, PCell) to LTE-U eNB1. The report may be sent from UE3 as Radio Resource Control (RRC) message to the LTE-U eNB1. The report, in order to identify the cells of the detected unlicensed frequency may include timing information in addition to the cell identifier (eg, PCI). The timing information may relate to the reception of downlink signals in a wireless terminal, showing the relationship between those of the frame timing and a serving cell of the detected cell. The timing information is the difference between that of the frame timing and a serving cell of the detected cells may indicate (eg, the difference in the time difference, or subframe number).
[0054]
　In description of FIG. 4, as an example of a predetermined relationship relating the frame timing, unlicensed frequency of cells received at the UE3 (eg, Cell # 2 or Cell # 3) frame timing (i.e., the head position of the radio frame or radio the frame boundaries) are shifted by a predetermined offset with respect to that of the serving cell (eg, Cell # 1), or a predetermined showed that falls within the offset. Set value of the predetermined offset used in this example, may be notified from the LTE-U eNB1 serving cell (Cell # 1) to the UE3. LTE-U eNB1, for example, the set value of the predetermined offset may be included in the setting information about the terminal measurements to be sent to the UE3 (MeasConfig). Alternatively, LTE-U eNB1, including the set value of the predetermined offset to the non-attribution cells transmitted UE3 settings for detection of the proximity of the (non-serving cell) to the information (proximity configuration for unlicensed frequency) it may be.
[0055]
　8, the radio base station for the terminal measuring a sequence diagram showing a (LTE-U eNB) 1 and a wireless terminal (UE) 3 operations (processing 800), setting information setting value of a predetermined offset for the terminal measurement ( It shows an example included in MeasConfig). In Figure 8, similarly to FIG. 2, LTE-U eNB1 is, a case of managing cell (Cell # 2) in the cell (Cell # 1) and the unlicensed frequency (F2) in the license frequency (F1).
[0056]
　8, first UE3 is, Cell # 1 establishes a radio connection with LTE-U eNB1 in (RRC Connection Establishment, 801), further bearer with the core network (not shown) (EPC) (eg EPS bearer, E- It establishes a RAB). Thereafter, the ready example of transmitting and receiving user data (not shown). LTE-U eNB1 is an indication of the terminal measured in the unlicensed frequency (e.g. F2) to UE3 (UE Measurement), performed by predetermined control signaling Cell # 1 (Measurement Configuration and Instruction for Unlicensed Frequency (eg Cell # 2 on F2), 802). In other words, a predetermined control signaling sent by the Cell # 1 shows the instruction of the terminal measured in the unlicensed frequency (e.g. F2) (UE measurement).
[0057]
　Instruction of the control signaling or terminal measurement (802) is shown in order to identify the unlicensed frequency of cells to be targeted for terminal measurement, cell identifier (eg, PCI) and the set value of the predetermined offset. Set value of the predetermined offset represents the serving cell (eg, Cell # 1) frame size of the offset in the timing of unlicensed frequency cell for frame timing (eg, Cell # 2) of the. As already mentioned, the set value of the predetermined offset is the head position of the radio frame of the two cell time difference (radio frame boundary) (eg, X msec) may be defined by, within a certain observation period (eg it may be defined by the difference of one sub-frame period = 1 millisecond) to the sub-frame numbers of the two cells received (eg, Y subframes).
[0058]
　Continuing with the description back to FIG. 8. UE3 responds to the control signaling (802), that is in accordance with an instruction of the terminal measurement, Cell and # 2 perform terminal measurement (Measurement, 804), LTE-U eNB results in Cell # 1 of the terminal measurement to report to the (Measurement reporting for Unlicensed Frequency (eg Cell # 2 on F2), 805). UE3, for example, in the terminal measuring (804), based on the PSS and SSS transmitted from LTE-U eNB1 in Cell # 2, to identify the PCI, and frame timing of Cell # 2, transmission with Cell # 2 the reception strength or reception quality of CRS may be measured to be.
[0059]
　Incidentally, Cell # 1 predetermined control signaling (802) may further specify the license frequency cell (Cell # 1) as the target of the terminal measurement. Terminal measuring (804), in addition to Cell # 2, may include a terminal measurement of Cell # 1. Terminal measurement reports in Cell # 1 to LTE-U eNB (805), in addition to the measurement results of Cell # 2, may include a measurement result of the Cell # 1.
[0060]
　Figure 9 is a flow chart showing another example of the processing performed by the UE3 (process 900). At block 901, in contrast to the process 400 of FIG. 4, UE3, the frame timing serving cell (Cell # 1) cell (EG, Cell # 3) that does not have a predetermined relationship between the frame timing of the detecting attempts at unlicensed frequency (F2). Examples of a predetermined relationship of the frame timing, as already described with respect to FIG. 4, the head position of the radio frame of the two cells (radio frame boundary) that are aligned substantially or two cells of a radio frame it may be that a predetermined offset exists between the head position. At block 902, UE3 performs predetermined processing on detected cells at block 901. Predetermined process may include at least one of the plurality of processes described with respect to FIG.
[0061]
　As understood from the above description, UE3 according to the present embodiment, the target cells using frame timing and unlicensed frequency of the serving cell (Cell # 1) that uses the license frequency (eg, Cell # 2 or Cell # 3) based on a predetermined relationship between the frame timing, it is possible to perform a predetermined process related to the target cell in the unlicensed frequencies. Therefore, UE3 according to this embodiment can contribute to the whether having the predetermined relationship between the frame timing of the serving cell (Cell # 1), to distinguish between a plurality of cells of unlicensed frequency. In some implementations, the predetermined relationship may comprise frame timing of the target cell (eg, Cell # 2 or Cell # 3) is aligned with frame timing of the serving cell (Cell # 1). In some implementations, the predetermined relationship, the target cell (eg, Cell # 2 or Cell # 3) frame timing can fit in a predetermined first offset with respect to the frame timing of the serving cell (Cell # 1), or it may comprise not fit in the first offset. In some implementations, the predetermined relationship is shifted by a predetermined second offset relative to the frame timing of the target cell frame timing (eg, Cell # 2 or Cell # 3) is serving (Cell # 1) it may also include.
[0062]
　Second embodiment described above may also be implemented as follows.
[0063]
　1. Wireless terminal (UE, eg, UE3) is (a radio base station (eNB, eg, without Morawa any information about frame synchronization timing from LTE-U eNB1)) License frequency (eg, F1) of the serving cell (eg , assuming that it is synchronized cell # 1) and performs predetermined processing in the unlicensed frequency (eg, F2) (cell search, the terminal measures, such as the detection of proximity). Note that the trigger may also receive control information relating to the predetermined processing from the eNB to perform a predetermined process. Meanwhile, eNB, the first cell of the license frequency (eg, F1) (UE serving cell, eg, Cell # 1) in synchronization with the second cell in unlicensed frequency (eg, F2) (eg, Cell # 2) it operates, and transmits the control information that triggers for performing predetermined processing with respect to the second cell to the UE. Note that the control information, UE individual message (RRC signaling. Eg, RadioResourceConfigDedicated) may be transmitted at or broadcast information (SIB).
[0064]
　2. Wireless terminal (UE, eg, UE3) is a radio base station (eNB, eg, LTE-U eNB1) detection timing from a predetermined allowable offset (first offset .Eg, frame timing or synchronization signal (PSS, SSS) deviation tolerance) receives, performs predetermined processing non-cellular (eg license frequency (eg, F2), cell # 2) only for the fall to the allowable offset. Incidentally, the trigger for performing predetermined processing, together with the allowable offset value, or in a separate message, may also receive control information relating to the predetermined processing from eNB. Meanwhile, eNB is licensed frequency (eg, F1) the first cell (eg, Cell # 1) of synchronization with the second cell in unlicensed frequency (eg, F2) (eg, Cell # 2) operated, and transmits control information as a trigger for performing predetermined processing with respect to the second cell, and the allowable offset which is a cell whether criteria should be subject to the UE. Incidentally, the control information and the allowable offset is transmitted in UE-specific message (RRC signaling.Eg, RadioResourceConfigDedicated) or broadcast information (SIB). Further, the control information, the value and the control information of the allowable offset together, or in separate messages may be sent to the UE.
[0065]
　3. Wireless terminal (UE, eg, UE3) is a radio base station (eNB, eg, LTE-U eNB1) detected from the predetermined offset value (a second offset .Eg, frame timing or synchronization signal (PSS, SSS) receiving a difference) of the timing, it performs a predetermined process to the cell (eg, cell # 2) (only) of the unlicensed frequencies of the offset (eg, F2). Incidentally, the trigger for performing predetermined processing, together with the value of the offset, or in a separate message, may also receive control information relating to the processing of the processing from the eNB. Meanwhile, eNB may first cell (eg, Cell # 1) and temporally with a predetermined offset unlicensed frequency (eg, F2) in the second cell of the license frequency (eg, F1) (eg, Cell # 2) it operates, and transmits the control information that triggers for performing predetermined processing for the values ​​and the second cell of the offset to the UE. The value and the control information of the offset transmits at UE-specific message (RRC signaling.Eg, RadioResourceConfigDedicated) or broadcast information (SIB). Furthermore, the value and the control information of the offset together, or in separate messages may be sent to the UE.
[0066]

　In the present embodiment, another example of the processing performed by the UE and the eNB are described. Configuration example of a wireless communication system according to this embodiment, FIG. 1A described with respect to the first embodiment is the same as FIG. 1B, and FIG.
[0067]
　UE3 according to the present embodiment, at least one of the set plurality of unlicensed frequency cell to use the same cell identifier and the same frequency with each other (eg, Cell # 2, and Cell # 3) (eg, when detecting the cell # 3), it detected cell frame timing related to the timing information and cell identifier (eg, is configured to transmit the LTE-U eNB1 in the PCI) serving (cell # 1). Timing information indicates a relationship between the frame timing of the detected cell (eg, Cell # 3) frame timing of the serving cell (Cell # 1). The timing information is detected cells (eg, Cell # 3) the difference between that of the frame timing of the serving cell (Cell # 1) may indicate (eg, the difference in the time difference, or subframe number).
[0068]
　In some implementations (implementations), LTE-U eNB1 is timing information and cell identifier received from UE3, are operated in the vicinity of the serving cell by the operator A for managing LTE-U eNB1 or this (Cell # 1) unlicensed frequency cells are (eg, cell # 2) may be compared with the frame timing and cell identifier. Then, LTE-U eNB1 is detected cell (eg, Cell # 3) cell identifier of (eg, PCI) cells are provided in an unlicensed frequency by the operator A for managing LTE-U eNB1 or this (eg Although consistent with that of the cell # 2), these when the frame timing of the two cells are not aligned, detected cell (eg, cell # 3) and LTE-U eNB1 or cells that operator a ( eg, may detect that the cell # 2) contention cell identifier between (conflict the) has occurred. In some implementations (the implementations), this process is different from the control node to the LTE-U eNB1 (eg, Self-Organizing Network (SON) controller, Software-Defined Network (SDN) controller, Operations Support System (OSS ), or Element may be performed by Management System (EMS)).
[0069]
　Figure 10 is a flowchart showing an example (process 1000) of the processing performed by the UE3 according to the present embodiment. In block 1011, UE3 will attempt to detect a cell in the unlicensed frequency (F2). The cell detection process (1011) may be performed in the terminal measurement set from LTE-UE eNB1 to UE3 (RRM Measurement) or detection of the proximity to the cell (proximity detection). In block 1011, UE3 is a detected cell in unlicensed frequency (F2), cell identifier (eg, PCI) as well as the relationship between its frame timing and a serving cell of the detected cell (Cell # 1) on the basis of the specified. That, UE3, even when detecting a plurality of cells using the same PCI in unlicensed frequency (F2), on the basis of a plurality of cells on the relation between the frame timing of the serving cell (Cell # 1) it can be distinguished.
[0070]
　In block 1012, UE3 transmits the detected cell (eg, Cell # 3) timing information and the PCI about the frame timing of the serving cell (Cell # 1) to the LTE-U eNB1. As already described, the timing information indicates a detected cell (eg, Cell # 3) relationship (eg, frame timing difference) between a frame timing of the frame timing and serving cell (Cell # 1).
[0071]
　UE3 according to the present embodiment can provide useful information for the detection of PCI conflict (i.e., timing information about the frame timing) to the network (eg, eNB1 or other control node). Therefore, according to this embodiment, UE3 is, PCI conflicts with the network, i.e. PCI collision or PCI confusion, it is possible to assist in the detection of.
[0072]

　In the present embodiment, another example of the processing performed by the UE and the eNB are described. Configuration example of a wireless communication system according to this embodiment, FIG. 1A described with respect to the first embodiment is the same as FIG. 1B, and FIG.
[0073]
　Figure 11 is a flowchart showing an example (process 1100) of the processing performed by the UE3 according to the present embodiment. In block 1101, UE3 will attempt to detect a cell in the unlicensed frequency (F2). The cell detection process (1101) may be performed in the terminal measurement set from LTE-UE eNB1 to UE3 (RRM Measurement) or detection of the proximity to the cell (proximity detection). In block 1101, UE3 is a detected cell in unlicensed frequency (F2), cell identifier (eg, PCI) as well as the relationship between its frame timing and a serving cell of the detected cell (Cell # 1) on the basis of the specified. That, UE3, even when detecting a plurality of cells using the same PCI in unlicensed frequency (F2), on the basis of a plurality of cells on the relation between the frame timing of the serving cell (Cell # 1) it can be distinguished.
[0074]
　In block 1102, the frame timing in order to determine whether the detected cell (eg, Cell # 2) to subject to the predetermined processing, the frame timing of the detected cell is the serving cell (Cell # 1) determines whether fit within the first offset with respect to. In some implementations, UE3, when the frame timing of the detected cell fits within the first offset with respect to that of the serving cell (Cell # 1), the detected cell as the target of predetermined processing it may be. Conversely, in some implementations, UE3, when the frame timing of the detected cell is not accommodated in the first offset with respect to that of the serving cell (Cell # 1), the detected cell it may be used as target of the predetermined processing.
[0075]
　Here, the predetermined process, in the same manner as described in the second embodiment, cell search, cell selection, cell reselection, the detection of the proximity to the cell, reporting proximity to the cell, the terminal measures the terminal measurement reporting the results, the radio quality measurement, the radio quality measurement report, channel state measurement of the channel state measurement reports, and may include at least one of the sensing. The value of the first offset, similar to that described in the second embodiment, the head position of the radio frame of the two cell time difference (radio frame boundary) (eg, X msec) may be defined by , the difference in a certain observation period in (eg, 1 sub-frame period = 1 millisecond) to the sub-frame numbers of the two cells received (eg, Y subframes) may be defined by. First offset (allowable offset) using the UE-specific message (RRC signaling) or broadcast information (SIB), or may be transmitted from the LTE-U eNB1 to UE3.
[0076]
　As understood from the above description, UE3 according to the present embodiment, attempts to detect a cell in the unlicensed frequencies, detected cell (eg, Cell # 2 or Cell # 3) and serving (Cell # 1 ) actively determine the relationship between frame timings and, of detected cell frame timing serving cell (cell # 1) of the same predetermined processes the detected cell in response to having a predetermined relation it can be targeted. Therefore, UE3 according to this embodiment can contribute to the whether having the predetermined relationship between the frame timing of the serving cell (Cell # 1), to distinguish between a plurality of cells of unlicensed frequency.
[0077]

　In the first to fourth embodiments have been described for an example of LTE-U by LAA method of performing CA license frequency and unlicensed frequencies. In this embodiment, LTE-U eNB and UE will be described for the case having the function of Dual Connectivity (DC). Figure 12 is a diagram showing a configuration example of a radio communication system according to this embodiment. The radio base station (eNB) 4 and 5 and the wireless terminal (UE) 7 has a function of Dual Connectivity. Dual Connectivity is the main base station (master base station, Master eNB: MeNB) 4 and the sub base station (secondary base station, Secondary eNB: SeNB) is provided by 5 (i.e., is managed) each radio resource (i.e. , UE 7 by using cells or carrier) at the same time is a process to perform communication. In the example of FIG. 12, is connected via a MeNB4 and SeNB5 is X2 interface, MeNB4 manages the Cell # 1 license frequency F1, the Cell # 2 and Cell # 3 in unlicensed frequency F3 of SeNB5 license frequency F2 to manage. MeNB4 and SeNB5 operates as a normal LTE eNB for the UE is not performed DC, it can communicate with the UE, independently at each Cell # 1 and Cell # 2.
[0078]
　UE7 supporting DC is, MeNB4 a carrier aggregation frequency that is managed by the respective SeNB5 uses as different cells at the same time belonging cell (serving cell) (Carrier Aggregation: CA) can be performed. Set of serving cell that MeNB4 managed are called Master Cell Group (MCG), the set of serving cell that SeNB5 managed is called the Secondary Cell Group (SCG). MCG includes at least Primary Cell (PCell), it may further include one or more Secondary Cell (SCell). SCG includes at least Primary SCell (abbreviated as pSCell or PSCell), it may further include one or more SCell. pSCell at least uplink physical control channel (Physical Uplink Control CHannel: PUCCH) is assigned a cell having a role as a PCell in SCG.
[0079]
　In the following, it will be briefly described with respect to Dual Connectivity (DC). For more information on the Dual Connectivity, for example, see Non-Patent Document 5. MeNB4 a core network for UE7 to perform DC (Evolved Packet Core: EPC) mobility management device: holding a connection with (Mobility Management Entity MME) (S1 -MME). Therefore, MeNB4 may be referred to as a UE7 mobility management point (or mobility anchor). Therefore, the control information of the Control Plane (CP) is transmitted and received between the MeNB4 the UE7 in MCG. Control information CP related to SCG of SeNB5 is exchanged between SeNB5 the MeNB4 (X2 interface) is transmitted and received between the MeNB4 the UE7 In yet MCG. For example, SCG of Radio Resource Configuration (eg RadioResoureConfigDedicated IE) is transmitted from SeNB5 in inter-node RRC message called SCG-Configuration to MeNB4, transmitted from MeNB4 in RRC Connection Reconfiguration message to the UE 7. On the other hand, the terminal capability information of UE7 (UE-EUTRA capabilities IE) , security information SCG (eg SK eNB ), MCG of Radio Resource Configuration (eg RadioResourceConfigDedicated IE), etc., in inter-node RRC message called SCG-ConfigInfo MeNB4 It is sent from to SeNB5.
[0080]
　In DC, three configurations are supported in terms of bearer setting of User Plane (UP). The first is the MCG bearer. MCG bearer, in order to use only resources MeNB4 (eg MCG), a bearer wireless protocol is disposed only on MeNB4, like a normal LTE is not performed DC, gateway (Serving Gateway (S -GW) or Packet Data Network Gateway (P-GW)) and the connection between the MeNB4 (S1-U) is retained. The second is the SCG bearer. SCG bearer, in order to use only resources SeNB5 (eg SCG), a bearer wireless protocol is disposed only on SeNB5, the gateway device connected between the (S-GW or P-GW) and SeNB5 ( S1-U) is retained. The third is a Split bearer. Split bearer, in order to use the resources of both MeNB4 and SeNB5 (eg MCG and SCG), a bearer wireless protocol is located in both MeNB4 and SeNB5. In Split bearer, is connected between the gateway device (S-GW or P-GW) and MeNB4 (S1-U) is held, UP data sent, for example, SCG (eg PDCP PDU), via the X2 MeNB4 It is transferred from to SeNB5. When performing LAA in SeNB5 and UE7 running DC, it uses the cells of unlicensed frequency as SCell with e.g. SCG of PSCell. At this time, in the unlicensed frequency cell, the radio bearer corresponding to the SCG bearer or Split bearer (Radio Bearer) are established.
[0081]
　Figure 13 shows an example of a situation in which a plurality of cells provided by the different LTE operator uses the same PCI. In the example of FIG. 13, MeNB4 and SeNB5 supports Dual Connectivity is managed by the operator A. Cell # 3 of unlicensed frequency (F3) has a PCI # 5. On the other hand, LTE-U eNB 6 is managed by other operators B different from the operator A, it operates a Cell # 4 in unlicensed frequency F3. In the example of FIG. 13, because with Cell # 3, and Cell # 4 is and the same PCI # 5 adjacent to each other, PCI collision occurs. Incidentally, Cell # 3, and Cell # 4 having the same PCI # 5 is not adjacent to one another may be disposed so that each is adjacent to Cell # 2, PCI confusion occurs in this case.
[0082]
　Described in the first to fourth embodiments, distinguished techniques in the UE based on a predetermined relationship between the cells in the unlicensed frequency and frame timing of the frame timing and a serving cell, Dual Connectivity shown in FIG. 13 It can also be applied to the case. Note that the serving cell of the above-described cell MeNB4 (MCG.Eg, PCell) may be the cell of SeNB5 (SCG.Eg, PSCell) may be used. However, it may also be SFN is synchronized between the SCG of MCG and SeNB5 of MeNB4, it may not be synchronized. If SFN is not synchronized, and if the serving cell shown in the description of the first and second embodiments is a cell of MeNB4 (eg, PCell), UE7 will account for differences in SFN of MCG and SCG it may be determined for a given relationship Te may be determined for a given relationship based on SFN cell (eg, PCell) of MeNB4. In the latter case, UE 7 may be reported in MeNB4 also differences in SFN.
[0083]
　Further, UE 7, for example a control information including first and second offset values ​​may be received from SeNB5 in SCG, it may be received from MeNB4 in MCG. Further, the control information may be generated by SeNB5, it may be generated by MeNB4. In the former case, SeNB5 transfers generated control information (e.g., offset of the set value), for example, by SCG-Configuration in MeNB4, MeNB4 may send to the UE 7. Furthermore, UE 7 is a timing information of the detected cells may be sent to SeNB5 in SCG in unlicensed frequency (F3), it may be transmitted to MeNB4 in MCG. In the latter case, MeNB4 may transfer the timing information, for example, by SCG-ConfigInfo to SeNB5.
[0084]
　Finally the radio terminal according to the embodiment described above (UE3, UE7) and a radio base station (LTE-U eNB1, MeNB4, SeNB5) configuration example of the will be described. Each of the wireless terminals described in the above embodiments (UE3, UE 7) is a radio base station (LTE-U eNB1, MeNB4, SeNB5) transceiver for communicating with, and also include a controller coupled to the transceiver good. The controller performs processing for the wireless terminal which has been described in the above embodiment (UE3, UE 7) (e.g., distinguishing processing based cell unlicensed frequency relationship between the frame timing of the frame timing and a serving cell) .
[0085]
　Each of the radio base station described in the above embodiments (LTE-U eNB1, MeNB4, SeNB5) the wireless terminal (UE3, UE 7) a transceiver for communicating, and also include a controller coupled to the transceiver good. The timing controller, the process relates to a radio base station described in the above embodiments (LTE-U eNB1, MeNB4, SeNB5) (e.g., transmission to UE3 or UE7 setting a predetermined offset, received from UE3 or UE7 to perform the detection of the PCI conflict) based on the information.
[0086]
　Figure 14 is a block diagram showing a configuration example of a wireless terminal (UE) 3 according to the first to fourth embodiments. It may have the same configuration as the wireless terminal 7 also FIG. 14 according to the fifth embodiment. Referring to FIG. 14, UE3 includes a wireless transceiver 3001, a processor 3002, and memory 3003. Radio transceiver 3001 is configured to communicate with LTE-U eNB1.
[0087]
　The processor 3002 reads and executes the software from the memory 3003 (a computer program), the process described in the above embodiments 300,400,800,900,1000, or performs UE3 process relating to 1100. The processor 3002 may be, for example, a microprocessor, Micro Processing Unit (MPU), or Central Processing Unit (CPU). Processor 3002 may include multiple processors.
[0088]
　Memory 3003 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, for example, a mask Read Only Memory (MROM), Programmable ROM (PROM), flash memory, or hard disk drive, or a combination thereof. The memory 3003 may include a storage that is remotely located from the processor 3002. In this case, the processor 3002 may access the memory 3003 via the I / O interface (not shown).
[0089]
　Memory 3003, for storing one or more software modules including instructions and data for performing the described process 300,400,800,900,1000, or 1100 relates UE3 processing in the above embodiments it may be used. The processor 3002, the one or more software modules that run from the memory 3003, it is possible to perform the UE3 of processing described in the above embodiments.
[0090]
　Figure 15 is a block diagram showing a configuration example of a wireless base station (LTE-U eNB) 1 according to the first to fourth embodiments. May have the same configuration as the radio base station 4 and 5 also Figure 15 according to the fifth embodiment. Referring to FIG. 15, LTE-U eNB1, the radio transceiver 1001, a network interface 1002, a processor 1003, and memory 1004. Radio transceiver 1001 is configured to communicate with UE3. Network interface 1002 is used to communicate with a network node (eg, MME and S-GW). Network interface 1002 may include, for example, a network interface card that complies with the IEEE 802.3 series (NIC).
[0091]
　The processor 1003 reads and executes the software from the memory 1004 (a computer program), the process of LTE-U eNB1 to processing 300,400,700,800, or 900 described in the above embodiments. The processor 1003, e.g., a microprocessor, MPU, or a CPU. Processor 1003 may include multiple processors.
[0092]
　Memory 1004 is constituted by a combination of volatile and nonvolatile memory. Volatile memory is, for example, a SRAM or DRAM, or a combination thereof. The non-volatile memory, for example, MROM, PROM, flash memory, or hard disk drive, or a combination thereof. Memory 1004 may include a storage that is remotely located from the processor 1003. In this case, the processor 1003 may access the memory 1004 via the I / O interfaces that are not network interface 1002 or illustrated.
[0093]
　Memory 1004, one or more software modules including a processing described in the above embodiments 300,400,800,900,1000, or 1100 instructions and for executing the processing of the LTE-U eNB1 related data it may be used to store. The processor 1003, the one or more software modules that run from the memory 1004, it is possible to perform the processing of LTE-U eNB1 described in the above embodiments.
[0094]
　As described with reference to FIGS. 13 and 14, the processor having the UE3 and 7 and eNB1,4 and 5 according to the above embodiment each of the order to perform the algorithm described with reference to the drawings in the computer one or more programs including instructions may be executed. These programs are stored using non-transitory computer readable media of various types (non-transitory computer readable medium), it can be supplied to the computer. Non-transitory computer readable media include with various types of entities (tangible storage medium). Examples of non-transitory computer readable media include magnetic storage media (such as floppy disks, magnetic tape, hard disk drive), magneto-optical recording medium (e.g., magneto-optical disk), Compact Disc Read Only Memory (CD-ROM), CD- R, including CD-R / W, a semiconductor memory (e.g., a mask ROM, Programmable ROM (PROM), Erasable PROM (EPROM), flash ROM, Random Access memory (RAM)). The program may be provided to a computer using a temporary computer readable media of various types (transitory computer readable medium). Examples of transitory computer readable media include electric signals, optical signals, and electromagnetic waves. Transitory computer readable media, wired communication path such as electrical wires and optical fibers, or via a wireless communication path can provide the program to a computer.
[0095]

　plurality of embodiments described above may be implemented independently, or may be implemented in appropriate combination.
[0096]
　In the above embodiment, for convenience of description, drawing only a plurality of cells using the same PCI as the cell of an unlicensed frequency is shown (FIG. 2, FIG. 12, etc.) has been described with reference to, these figures are not only an example. That is, in the embodiment described above, may be at least one cell PCI conflict has not occurred is operated in an unlicensed frequency, the UE3 and 7, the processing described above for the at least one cell 300, 400 , it may be performed 700, 800, or 900 or the like. Moreover, the frequency in the embodiment described above, a plurality of frequencies in unlicensed frequency (carrier or channel) may be possible using, the UE3 and 7, as specified by their all of the plurality of frequencies, or LTE-U eNB treatment by setting a 300,400,700,800, or may be performed 900, and the like.
[0097]
　For example, if in addition to Cell # 2 shown in FIG. 2 (PCI # 5) and Cell # 3 (PCI # 5), there are Cell # 4 with these different PCI (PCI # 6), UE3 was detected in unlicensed frequency (F2), (i) Cell # PCI # 5 and the frame timing corresponding to 2, (ii) Cell # PCI # 5 and the frame timing corresponding to 3, and (iii ) detects the PCI # 6 and the frame timing corresponding to Cell # 4, may report these to LTE-U eNB1. Alternatively, UE3 does not report the PCI # 5 and the frame timing corresponding to (i) Cell # PCI # 5 and the frame timing and corresponds to 2 (ii) Cell # 3 in LTE-U eNB1 in may report PCI # 6 and the frame timing LTE-U eNB1 corresponding to (iii) Cell # 4. In these examples, LTE-U eNB1 receives reports from UE3, than Cell # 2 that could PCI conflict occurs, the Cell # 4 of PCI conflict is estimated that not occurred preferentially may be selected as the CA of secondary cell (SCEL).
[0098]
　PCI described in the above embodiment, an example of a cell identifier (physical identifiers). For example, in the unlicensed frequency cells, it might conflict with different other cell identifiers and PCI. In some implementations, the cell identifier of the unlicensed frequency may be a Virtual Cell ID. Virtual Cell ID may be, for example, the reference signal at the unlicensed frequency cell (Reference Signal) scrambling code identifier used such as transmission of (eg Scrambling Identity, or Scrambling Code ID). Further, in some implementations, the cell identifier of the unlicensed frequency may be different identifier and PCI defined by applying the new cell ID or cell index for cells of unlicensed frequency. These identifiers may be used in or in combination in place of the PCI.
[0099]
　In the above embodiment has been described LAA cases. That is, in the first to fourth embodiments, the radio base station (LTE-U eNB) 1 and with a wireless terminal (UE) 3 is used the cells of the license frequency as a primary cell (PCell), the unlicensed frequency cell It was mainly described carrier aggregation to be used as a secondary cell (SCell) (CA). In the fifth embodiment, MeNB4 and SeNB5 is using the license frequency, SeNB5 is mainly described Dual Connectivity (DC) for further use unlicensed frequency. However, in the first to fourth embodiments, the radio base station (LTE-U eNB) 1 uses a certain shared frequency (e.g. F3) as PCell, narrow unlicensed frequency (e.g. F2), or other shared frequency (e.g., F4) may be performed carry aggregation (CA) for use as a secondary cell (SCell). Here, the unlicensed frequency in a narrow sense, means a frequency that is not assigned to any of the operator (i.e., the frequency nor and shared frequency rather than license frequency). Similarly, in the fifth embodiment, for Dual Connectivity (DC), MeNB4 will use the shared frequency, SeNB5 may use unlicensed frequency shared frequency or narrow.
[0100]
　Furthermore, PCI contention (conflict The) has a plurality of LTE operator may occur in a variety of situations, not only situations to be used for unlicensed frequency (or license shared frequency) the LAA or LSA. PCI contention (conflict The), i.e. PCI collision or PCI confusion is unlicensed frequency, license shared frequency, and also can occur when using any license frequency, between a plurality operators, and the one operator there is likely to occur either. Described in the above embodiment, distinguishing a plurality of cells using the same PCI and the same frequency in the UE based on the relationship between those of these frame timing and serving cell technology, various cases in which PCI conflicts it can be applied to.
[0101]
　Furthermore, as already mentioned, PCI confusion is to use a frequency in which a plurality of cells are different, there can also occur if they are using the same PCI. It described in the above embodiment, distinguishing a plurality of cells using the same PCI in the UE based on the relationship between those of these frame timing and serving cell technology, PCI between a plurality of cells using different frequencies confusion can be applied to a case that occurs.
[0102]
　Further, in the embodiment described above, it has been described primarily in the context of a LTE system. However, as already mentioned, these embodiments, wireless communication systems other than the LTE system, for example, 3GPP UMTS, 3GPP2 CDMA2000 systems (1xRTT, HRPD), also be applied GSM / GPRS system, or WiMAX system, etc. good. Incidentally, I called a radio base station having a function of performing an LTE communication in unlicensed frequency (eNB) and RRH / RRE radio base station (LTE-U eNB). Similarly, in other systems, a plurality of frequencies (e.g., license frequency and unlicensed frequency) are possible introduction of network device capable of communicating in, can be a generic name of them is referred to as a radio station. That is, the wireless station corresponds to the radio base station (eNB) and RRH / RRE as described above In LTE, the base station in the UMTS: equivalent to (NodeB NB) and the base station control station (RNC), further CDMA2000 the system corresponds to a base station (BTS) and base station controller (BSC). Furthermore, especially in the example of Dual Connectivity (DC), it can be referred to as the main base station the base station system comprising (LTE in MeNB) and sub-base station (the LTE SeNB) a radio station. Each of the main base station and sub base station may be referred to as a wireless communication node.
[0103]
　On non-LTE system, PCI and is used different other cell identifier (e.g., PSC used in 3GPP UMTS), as well as PCI competition (conflict The) also compete for these cell identifiers may occur . Described in the above embodiments, a plurality of cells using the same PCI distinguish the UE on the basis of the relationship between those of these frame timing and serving cell technology competitive other cell identifier of PSC or the like occurs it can be applied to a variety of cases.
[0104]
　Further, in the above embodiments, the serving cell (e.g., Cell # 1 in FIG. 2) and a plurality of cells (e.g., that is configured to use the same cell identifier and the same frequency with each other, in FIG. 2 Cell # 2 and Cell # 3) may use different Radio Access Technology (RAT) to each other. For example, the serving cell may be a cell of a LTE (E-UTRAN), a plurality of cells different from the serving cell may be a cell of a UMTS (UTRAN).
[0105]
　Furthermore, the above-described embodiments are only examples for the application of technical ideas obtained by the present inventor. In other words, the technical idea is not limited to the embodiments described above, it is needless to say various modifications are possible.
[0106]
　This application claims priority based on 2014 November Japanese Patent Application No. 2014-226392, filed on 6 days, the entire disclosure of which is incorporated herein.
DESCRIPTION OF SYMBOLS
[0107]
1,4,5 radio base station
3,7 radio terminal
1001,3001, wireless transceiver
1002 network interface
1003,3002 processor
1004,3003 memory

The scope of the claims
[Claim 1]
　A memory,
　while being coupled to the memory, based on a predetermined relationship between the frame timing of the first cell using the frame timing and unlicensed frequency of the first serving cell that uses a license frequency, the unlicensed frequency , at least one processor operable to perform a predetermined processing related to the first cell in a
wireless terminal comprising.
[Claim 2]
　It said predetermined relationship comprises a frame timing of the first cell is aligned with frame timing of the first serving cell,
the radio terminal according to claim 1.
[Claim 3]
　Said predetermined relationship comprises not fit the the frame timing of the first cell fits within the first offset with respect to the frame timing of the first serving cell, or within the first offset,
wherein wireless terminal according to claim 1.
[Claim 4]
　Wherein the at least one processor, the attempts to detect a cell in the unlicensed frequencies, the detected cell to determine whether the target of the predetermined processing, the frame timing of the detected cell is operable to determine whether having said predetermined relationship between the frame timing of the first serving cell,
the radio terminal according to claim 3.
[Claim 5]
　Wherein the at least one processor is further configured to receive from a radio station different second serving cell and said set value of the first offset first serving cell of the radio station or the first serving cell ,
wireless terminal according to claim 3 or 4.
[Claim 6]
　Said predetermined relationship comprises a frame timing of the first cell are shifted by a second offset relative to the frame timing of the first serving cell,
the radio terminal according to claim 1.
[Claim 7]
　Wherein the at least one processor is further configured to receive from a radio station different second serving cell and said second offset setting first serving cell of the radio station or the first serving cell ,
wireless terminal according to claim 6.
[8.]
　Wherein the at least one processor is further said the no predetermined relationship second cell the predetermined processing between but using unlicensed frequencies and the frame timing of the frame timing of the first serving cell not considered as a target,
the wireless terminal according to any one of claims 1 to 7.
[Claim 9]
　Wherein the at least one processor further, the frame timing attempts in the unlicensed frequency detection of the second cell that does not have the predetermined relationship between the frame timing of the first serving cell,
according to claim 1 7 radio terminal according to any one of.
[Claim 10]
　The second cell, the first is the cell in the same cell identifier is set a cell belongs is not allowed for the radio terminal,
the radio terminal according to claim 9.
[Claim 11]
　Wherein the at least one processor is further configured to notify the radio stations of different second serving cell and the said detection of the second cell the first serving cell of the radio station or the first serving cell,
the wireless terminal of claim 9 or 10.
[Claim 12]
　Wherein the at least one processor, based on said predetermined relationship, and the second cell the first is to use the same cell identifier and the first cell to the cell attribution of the wireless terminal is not allowed distinguishing,
wireless terminal according to claim 1.
[Claim 13]
　The predetermined processing is, cell search, cell selection, cell reselection, the detection of the proximity to the cell, reporting proximity to the cell, the terminal measures the terminal measurement reports, the radio quality measurement, the radio quality measurement report, channel state measurement, the channel state measurement report, and at least one of sensing,
wireless terminal according to any one of claims 1 to 12.
[Claim 14]
　Wherein the at least one processor is further the attempt to detect a cell in the unlicensed frequency, and the detected radio station or the said timing information and cell identifiers of the frame timing of the cell was first serving cell first serving cell different second is configured to transmit to the radio station of the serving cell, the
radio terminal according to claim 1.
[Claim 15]
　The timing information indicates a relationship between the frame timing of the detected frame timing and the first serving cell,
the radio terminal according to claim 14.
[Claim 16]
　The timing information indicates a difference between the frame timing of the detected frame timing and the first serving cell,
the radio terminal according to claim 14 or 15.
[Claim 17]
　The frame timing, (a) the timing of receiving the head of the radio frame or subframe in the wireless terminal, timing for transmitting the head of the radio frame or subframe from (b) 1 or more wireless stations, (c) the is a timing to transmit timing to receive a synchronization signal in a wireless terminal, or (d) 1 or synchronization signals from a plurality of radio stations,
the radio terminal according to any one of claims 1 to 16.
[Claim 18]
　The cell identifier includes a physical cell identity (PCI) or primary scrambling code (PSC),
the wireless terminal according to claim 10, 12, or 14.
[Claim 19]
　A wireless station,
　a memory,
　and at least one processor coupled to said memory,
comprising a
　at least one processor is
the frame timing of the first cell to be operated in licensed frequency by the radio station transmits the setting information including information on offset between the frame timing of the second cell is operated in an unlicensed frequency by the radio station to the radio terminal,
　wherein the predetermined performed by the wireless terminal to an unlicensed frequency transmitting control information about the process to the wireless terminal,
it operates as,
radio station.
[Claim 20]
　It said information on the offset, the in the wireless terminal is using the second cell to determine whether the target of the predetermined processing,
the radio station according to claim 19.
[Claim 21]
　Information on the offset, the first offset, and the reference of the determination whether the shift frame timing by a predetermined offset that is used to as a reference for the judgment whether or not fit in predetermined offset includes a second offset to be used when, for one at least,
the radio station according to claim 20.
[Claim 22]
　The predetermined processing is, cell search, cell selection, cell reselection, the detection of the proximity to the cell, reporting proximity to the cell, the terminal measures the terminal measurement reports, the radio quality measurement, the radio quality measurement report, channel state measurement, the channel state measurement report, and at least one of sensing,
wireless station according to any one of claims 19-21.
[Claim 23]
　Information on the offset, the said first cell to distinguish it from a second cell using the same cell identifier and the first cell is used in the wireless terminal,
any one of claims 19-22 radio station according to paragraph 1.
[Claim 24]
　A method performed by the wireless terminal,
　based on a predetermined relationship between the frame timing of the first cell using the frame timing and unlicensed frequency of the first serving cell that uses the license frequency, in the unlicensed frequency how comprising performing the predetermined processing related to the first cell.
[Claim 25]
　It said predetermined relationship comprises a frame timing of the first cell is aligned with frame timing of the first serving cell,
The method of claim 24.
[Claim 26]
　Said predetermined relationship comprises not fit the the frame timing of the first cell fits within the first offset with respect to the frame timing of the first serving cell, or within the first offset,
wherein the method according to claim 24.
[Claim 27]
　Wherein the performing, the attempts to detect a cell in the unlicensed frequencies, the detected cell to determine whether the target of the predetermined processing, the frame timing of the detected cell is the first It comprises determining whether having said predetermined relationship between the frame timing of one of the serving cell,
the method of claim 26.
[Claim 28]
　Further comprising receiving a set value of the first offset from the radio stations of different second serving cell and the radio station of the first serving cell and the first serving cell,
The method according to claim 26 or 27 .
[Claim 29]
　Said predetermined relationship comprises a frame timing of the first cell are shifted by a second offset relative to the frame timing of the first serving cell,
The method of claim 24.
[Claim 30]
　Further comprising, receiving a set value of the second offset from the second serving cell of the radio station that is different from the first serving cell of the radio station or the first serving cell
The method of claim 29.
[Claim 31]
　Wherein at using the unlicensed frequency further comprising not consider a second cell that does not have the predetermined relationship between the frame timing of the first serving cell and the frame timing as the target of the predetermined processing,
　the method according to any one of claims 24-30.
[Claim 32]
　The frame timing further comprising attempting at the unlicensed frequency detection of the second cell that does not have the predetermined relationship between the frame timing of the first serving cell,
one of claims 24-30 1 the method according to item.
[Claim 33]
　The second cell, the first is the cell in the same cell identifier is set a cell belongs is not permitted in the wireless terminal,
the method according to claim 32.
[Claim 34]
　Further comprising notifying the second serving cell of the radio station that is different from the radio station or the said detection first serving cell first serving cell of the second cell,
the method according to claim 32 or 33.
[Claim 35]
　Wherein by performing, based on the predetermined relationship, but to use the first cell of the first cell and same cell identifier distinguishes a second cell belonging to the radio terminal is not allowed comprising,
a method according to claim 24.
[Claim 36]
　The predetermined processing is, cell search, cell selection, cell reselection, the detection of the proximity to the cell, reporting proximity to the cell, the terminal measures the terminal measurement reports, the radio quality measurement, the radio quality measurement report, channel state measurement, the channel state measurement report, and at least one of sensing,
the method according to any one of claims 24-35.
[Claim 37]
　The attempts to detect a cell in the unlicensed frequency radio stations of different second serving cell and the radio station or the said timing information about the frame timing of the detected cell and cell identifier the first serving cell first serving cell further comprising, sending the
method according to claim 24.
[Claim 38]
　The timing information indicates a relationship between the frame timing of the frame timing of the detected cell first serving cell,
The method of claim 37.
[Claim 39]
　The timing information indicates a difference between the frame timing of the detected frame timing and the first serving cell,
The method according to claim 37 or 38.
[Claim 40]
　A method performed by a radio station,
　between the frame timing of the second cell is operated in an unlicensed frequency and frame timing of the first cell to be operated in licensed frequency by the radio station by the radio station transmitting the setting information including information on an offset to the radio terminal, and
　that, to be transmitted to the wireless terminal control information relating to a predetermined processing performed by the wireless terminal with respect to the unlicensed frequency
comprises a
method.
[Claim 41]
　It said information on the offset, the in the wireless terminal is using the second cell to determine whether the target of the predetermined processing,
the method of claim 40.
[Claim 42]
　Information on the offset, the first offset, and the reference of the determination whether the shift frame timing by a predetermined offset that is used to as a reference for the judgment whether or not fit in predetermined offset includes a second offset to be used when, for one at least,
the method according to claim 41.
[Claim 43]
　The predetermined processing is, cell search, cell selection, cell reselection, the detection of the proximity to the cell, reporting proximity to the cell, the terminal measures the terminal measurement reports, the radio quality measurement, the radio quality measurement report, channel state measurement, the channel state measurement report, and at least one of sensing,
the method according to any one of claims 40-42.
[Claim 44]
　Information on the offset, wherein is used in the wireless terminal the first cell to distinguish it from a second cell using the same cell identifier and said first cell,
any one of claims 40-43 the method according to item 1.
[Claim 45]
　Non-transitory computer readable medium storing a program for causing the method according to the computer in any one of claims 24 to 39.
[Claim 46]
　Non-transitory computer readable medium storing a program for causing the method according to the computer in any one of claims 40-44.