WO2016047439A1 - 通信装置、無線通信システムおよび通信方法 - Google Patents
通信装置、無線通信システムおよび通信方法 Download PDFInfo
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- WO2016047439A1 WO2016047439A1 PCT/JP2015/075556 JP2015075556W WO2016047439A1 WO 2016047439 A1 WO2016047439 A1 WO 2016047439A1 JP 2015075556 W JP2015075556 W JP 2015075556W WO 2016047439 A1 WO2016047439 A1 WO 2016047439A1
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- 238000004891 communication Methods 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims description 29
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 33
- 238000005259 measurement Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 206010010305 Confusional state Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/13—Cell handover without a predetermined boundary, e.g. virtual cells
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present invention relates to a communication device, a wireless communication system, and a communication method.
- LTE Long Term Evolution
- Small Cell Small Cell
- Macro Cell macro Cell
- a plurality of small cells are formed in a high-load area such as a downtown area or a commercial building in order to improve the communication speed in a small area by taking advantage of the feature of covering a small area as compared with a macro cell covering a wide area.
- the macro cell and the plurality of small cells are often adjacent to each other, but the small cells may not be adjacent to each other.
- FIG. 1 shows an example of cell arrangement in an LTE wireless communication system.
- Cell ⁇ ⁇ ⁇ X which is a macro cell
- Cell Y, Z which are small cells
- Cell Y and Cell Z are not adjacent to each other.
- PCI Physical Cell Identity
- the cell identifier refers to PCI.
- PCI is a cell identifier that is locally used by a UE (User) Equipment) to identify a cell on a radio section.
- UE User Equipment
- 504 PCI values are repeatedly used.
- the small cell base stations (hereinafter referred to as small cell base stations y and z) that form Cell Y and Z, respectively, from the macro cell base station (hereinafter referred to as macrocell base station x) that forms Cell X
- neighbor information indicating a neighbor cell adjacent to X can be acquired via a connection line or the like (for example, X2 Interface). If the small cell base station y, z can acquire neighbor information from the macro cell base station x, it can be determined that PCI Confusion in which the PCI values of Cell Y, Z overlap each other is generated based on the neighbor information. . In that case, if any of the small cell base stations y and z autonomously reselects the PCI value, the PCI Confusion is canceled.
- the small cell base stations y and z cannot directly acquire the neighbor information from the macro cell base station x via a connection line or the like.
- the small cell base station y, z can acquire the neighbor information from the macro cell base station x, the neighbor information is insufficient, so it may not be possible to recognize a part of the neighbor cell adjacent to Cell X. is there.
- the small cell base stations y and z cannot acquire neighbor information from the partner small cell base station.
- the small cell base station y, z cannot determine that the PCI value of its own cell is causing PCI Confusion that overlaps with the PCI value of other cells, and autonomously determines the PCI value. PCI Confusion will not be resolved.
- the UE transmits a Measurement Report message including the PCI value 84 of the Cell Y of the handover destination candidate to the macro cell base station x forming the Cell X.
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- ECGI E-UTRAN Cell Global Identifier. E-UTRAN: Evolved Universal Terrestrial Radio Access Network
- ECGI is a cell identifier that uniquely identifies a cell in the entire communication network, unlike PCI.
- the macro cell base station x may request a handover to an incorrect Cell ⁇ ⁇ Z having the same PCI value as the Cell Y, instead of the handover destination candidate Cell Y. In this case, there is a problem that the handover fails and the handover success rate decreases.
- Patent Document 1 As a technique for solving this problem, there is a method described in Patent Document 1.
- a method described in Patent Document 1 it is assumed that there are a plurality of small cells that use the same PCI value in a macro cell, and a UE reports a PCI value and a CGI value of a handover destination candidate cell in a measurement report (Measurement Report). And are added.
- Patent Document 1 it is necessary for the UE to receive broadcast information of the cell in order to know the CGI value of the handover destination candidate cell. For this reason, there is a problem that the time for acquiring the CGI value becomes long and the transmission of the measurement report is delayed.
- one of the objects to be achieved by the embodiments disclosed in the present specification is to solve the above-described problem, regardless of the acquisition status of the neighbor information in the base station, the cell identifier of the cell of the base station, and the like.
- An object of the present invention is to provide a technique capable of eliminating duplication of cell identifiers with cell identifiers of cells. It should be noted that this object is only one of a plurality of objects that the embodiments disclosed herein intend to achieve. Other objects or problems and novel features will become apparent from the description of the specification or the accompanying drawings.
- the first communication device of the present invention is A communication apparatus in a wireless communication system, comprising: a terminal; a first base station that forms a first cell; and a second base station that forms a second cell adjacent to the first cell.
- a communication status acquisition unit for acquiring a communication status in the second base station; Based on the number of times the second base station has received a first message requesting re-establishment of an RRC connection from the terminal, a cell between the cell identifier of the second cell and the cell identifier of another cell And a controller that eliminates duplication of identifiers.
- the second communication device of the present invention A communication apparatus in a wireless communication system, comprising: a terminal; a first base station that forms a first cell; and a second base station that forms a second cell adjacent to the first cell. , A communication status acquisition unit for acquiring a communication status in the second base station; Based on the number of failed handovers of the terminal from the first cell to the second cell, a cell identifier of the second cell, a cell identifier of another cell adjacent to the first cell, and And a controller that eliminates duplication of cell identifiers.
- the first wireless communication system of the present invention includes: A wireless communication system comprising a terminal, a first base station that forms a first cell, and a second base station that forms a second cell adjacent to the first cell, A communication status acquisition unit for acquiring a communication status in the second base station; Based on the number of times the second base station has received a first message requesting re-establishment of an RRC connection from the terminal, a cell between the cell identifier of the second cell and the cell identifier of another cell And a controller that eliminates duplication of identifiers.
- the second wireless communication system of the present invention is A wireless communication system comprising a terminal, a first base station that forms a first cell, and a second base station that forms a second cell adjacent to the first cell, A communication status acquisition unit for acquiring a communication status in the second base station; Based on the number of failed handovers of the terminal from the first cell to the second cell, a cell identifier of the second cell, a cell identifier of another cell adjacent to the first cell, and And a controller that eliminates duplication of cell identifiers.
- the first communication method of the present invention includes: Communication performed by a communication apparatus in a wireless communication system having a terminal, a first base station that forms a first cell, and a second base station that forms a second cell adjacent to the first cell A method, Obtaining a communication status in the second base station; Based on the number of times the second base station has received a first message requesting re-establishment of an RRC connection from the terminal, a cell between the cell identifier of the second cell and the cell identifier of another cell Eliminate identifier duplication.
- the second communication method of the present invention includes: Communication performed by a communication apparatus in a wireless communication system having a terminal, a first base station that forms a first cell, and a second base station that forms a second cell adjacent to the first cell A method, Obtaining a communication status in the second base station; Based on the number of failed handovers of the terminal from the first cell to the second cell, a cell identifier of the second cell, a cell identifier of another cell adjacent to the first cell, and Cell identifier duplication is resolved.
- FIG. 1 is a diagram illustrating an example of cell arrangement in an LTE wireless communication system.
- FIG. It is a figure which shows an example of the whole structure of the radio
- FIG. 3 is a sequence diagram showing an example of a sequence when handover is successful in the wireless communication system shown in FIG. 2.
- FIG. 3 is a sequence diagram showing an example of a sequence when handover fails in the wireless communication system shown in FIG. 2.
- FIG. 10 is a sequence diagram illustrating an example of a sequence in a case where handover is caused by Too Early HO in the wireless communication system according to the third embodiment of this invention.
- FIG. 10 is a sequence diagram illustrating an example of a sequence in a case where handover is caused by Too Late HO in the wireless communication system according to the third embodiment of this invention.
- It is a block diagram which shows an example of schematic structure of the communication apparatus of this invention.
- FIG. 2 shows an example of the overall configuration of the wireless communication system of the present invention.
- LTE radio communication system including UE 10, macro cell base station 20A, small cell base stations 20B and 20C, and MME (Mobility Management Entity) 30.
- the macro cell base station 20A is a first base station that forms Cell A (PCI value 142) which is a macro cell (first cell).
- the small cell base station 20B is a second base station that forms Cell B (PCI value 84), which is a small cell (second cell).
- PCI value 84 is a small cell (second cell).
- the small cell base station 20 ⁇ / b> C is a second base station that forms Cell C (PCI value 84), which is a small cell (second cell).
- Cell B and C are installed in Cell A. Therefore, Cell A and Cell B and C are adjacent to each other. However, Cell B and Cell C are not adjacent to each other.
- the cell adjacent relationship is not limited to a relationship between a certain cell and a cell included in the cell (a relationship between Cell A and Cell C B, C). It also includes the relationship with neighboring cells adjacent to the cell.
- PCI value of Cell B, C is 84 and the same. For this reason, the PCI values of Cell B and C adjacent to Cell A overlap each other, resulting in PCI Confusion.
- UE 10 is a terminal that performs handover between Cell A to C. Note that the handover viewed from the handover source is appropriately referred to as Handout, and the handover viewed from the handover destination is appropriately referred to as Hand-in.
- the MME 30 is a core network device that is arranged in the core network and manages the movement of the UE 10.
- each sequence when the handover of UE 10 succeeds and fails in the wireless communication system shown in FIG. 2 will be described.
- a handover scenario via a base station-to-base station line (X2 ⁇ ⁇ Interface) is introduced, but the same applies to a handover scenario using a base station-core network line (S1 Interface).
- FIG. 3 shows an example of a sequence when the handover of the UE 10 is successful.
- the operation is started from the state where Serving10Cell of UE 10 is Cell A.
- the macro cell base station 20A that forms Cell A which is a Serving Cell of UE 10, transmits a Measurement Control message instructing UE 10 to measure reception quality of a neighbor cell adjacent to Cell A (Ste A1).
- the Measurement Control message is a message including information related to measurement, and includes an RRC Connection Reconfiguration message as an example.
- UE10 measures the reception quality of the neighbor cell adjacent to Cell A, and reports the PCI value of the handover destination candidate cell having good reception quality among these neighbor cells to macro cell base station 20A.
- a message is transmitted (step A2).
- PCI value 84 of Cell B is reported.
- the macro cell base station 20A stores the PCI value of the cell and the ECGI value in association with each other, and here stores the ECGI value of Cell B in association with the PCI value 84.
- the macro cell base station 20A transmits a Handover request message for requesting a handover from the UE 10 to the Cell B to the small cell base station 20B that forms the Cell B (step A3).
- the Handover request message is transmitted to the small cell base station 20B that forms the correct Cell B that is a handover destination candidate.
- the small cell base station 20B transmits a Handover Request Acknowledgment message for accepting the handover of the UE 10 to the macro cell base station 20A (step A4).
- This message includes RRCRRConnection (RRC connection) information between UE 10 and Cell B of the handover destination candidate cell.
- the macro cell base station 20A transmits to the UE 10 an RRC Connection Reconfiguration message including RRC Connection information (RRC connection) with Cell 10 of the handover destination candidate cell (Step A5).
- RRC connection RRC Connection information
- the Handover request message in step A3 is transmitted to the small cell base station 20B that forms the correct Cell B that is a handover destination candidate of the UE 10.
- UE10 completes reconfiguration of RRC Connection with Cell B, and transmits an RRC Connection Reconfiguration Complete message notifying completion of reconfiguration of RRC Connection to small cell base station 20B (step A6).
- ServingServCell of UE10 is switched from Cell A to Cell B.
- the small cell base station 20B transmits a Path-Switch-Request message requesting the MME 30 to switch the path from the macro cell base station 20A to the small cell base station 20B (step A7).
- the MME 30 transmits a Path Switch Request Acknowledgement message for accepting path switching to the small cell base station 20B (step A8).
- the small cell base station 20B transmits a UE Context Release message instructing the macrocell base station 20A to release the UE Context (step A9).
- FIG. 4 shows an example of a sequence when the handover of the UE 10 fails.
- the operation is started from the state where the Serving Cell of the UE 10 is Cell A.
- Steps B1 and B2 of FIG. 3 a Measurement Control message and a Measurement Report message are transmitted and received between the macrocell base station 20A and the UE 10 (Steps B1 and B2).
- the UE 10 reports the PCI value 84 of Cell ⁇ ⁇ ⁇ C as the PCI value of the handover destination candidate cell.
- the macro cell base station 20A stores the ECGI value of Cell B in association with the PCI value 84.
- the macro cell base station 20A transmits a Handover request message for requesting a handover from the UE 10 to the Cell B to the small cell base station 20B that forms the Cell B (step B3).
- the Handover Request message is not transmitted to the small cell base station 20C that forms the correct Cell C that is the handover destination candidate, but is transmitted to the small cell base station 20B that forms an incorrect Cell B that is not the handover destination candidate. Has been.
- the small cell base station 20B transmits a Handover Request Acknowledgment message for accepting the handover of the UE 10 to the macro cell base station 20A (step B4).
- the macro cell base station 20A transmits an RRCUEConnection Reconfiguration message instructing the UE 10 to reconfigure the RRC Connection with the handover destination candidate cell (step B5).
- the Handover request message of Step B3 is transmitted to the small cell base station 20B that forms Cell B that is not a handover destination candidate of the UE 10.
- the UE 10 does not complete the reconfiguration of the RRC connection with the handover target cell Cell C, and transmits an RRC Connection Re-establishment Request message requesting the reestablishment of the RRC Connection to the small cell base station 20C. (Step B6).
- the small cell base station 20C transmits an RRCUEConnection Re-establishment Reject message that rejects re-establishment of the RRC Connection to the UE 10 (step B7).
- Attach procedure in which the UE 10 attaches to the small cell base station 20C is executed (step B8).
- Serving Cell of UE10 switches from Cell A to Cell C.
- the failure of the handover of the UE 10 can be detected by the macro cell base station 20A.
- the small cell base station 20B and the small cell base station 20C can detect the failure of the handover of the UE 10 as follows.
- the small cell base station 20B receives the Handover Request message from the macro cell base station 20A and proceeds with the handover procedure, but does not receive the RRC Connection Reconfiguration Complete message from the UE 10. Therefore, the small cell base station 20B can determine that the macro cell base station 20A requested a handover (Hand-in) of the UE 10 from Cell A to Cell B, but the handover failed.
- the small cell base station 20C does not receive the Handover request message from the macro cell base station 20A, but receives the RRC connection Re-establishment request message from the UE 10. Therefore, the small cell base station 20C can determine that the handover of the UE 10 has failed. Further, the small cell base station 20C can determine the failure of the handover of the UE 10 and the handover source cell of the UE 10 by referring to the contents of the RRC Connection Re-establishment Request message as shown in FIG. For example, the handover failure of the UE 10 can be determined by setting handoverFailure or reconfigurationFailure in ReestablishmentlishCause. Further, the handover source cell of UE 10 can be determined from the PCI value set in physCellId included in ReestabUE-Identity.
- the present invention uses the fact that the small cell base stations 20B and 20C can detect a handover failure of the UE 10, thereby eliminating PCI confusion where the PCI values of the cells of the small cell base stations 20B and 20C overlap with the PCI values of other cells.
- the small cell base station 20B determines that PCI Confusion is occurring in the wireless communication system shown in FIG. It is.
- FIG. 6 shows an example of the configuration of the small cell base station 20B of the present embodiment.
- the small cell base station 20B includes a communication unit 21B, a communication status acquisition unit 22B, and a control unit 23B.
- FIG. 6 shows only essential components extracted from the components in the small cell base station 20B, and other components are omitted.
- the communication unit 21B communicates various messages and the like with the UE 10, the macro cell base station 20A, the small cell base station 20C, and the MME 30.
- the communication status acquisition unit 22B acquires the communication status such as various messages in the small cell base station 20B.
- the controller 23B Based on the number of times UE 10 failed to perform handover from Cell A to Cell B, the controller 23B overlaps the PCI value of Cell B and the PCI value of another cell adjacent to Cell A (PCI Confusion). ).
- control unit 23B counts the number of times that the handover of the UE 10 from Cell A to Cell B has failed. For example, the control unit 23B does not receive an RRC Connection Reconfiguration Complete message from the UE10 within a predetermined time after receiving a HandoverinRequest message requesting a handover (Hand-in) from the Cell A to the Cell B of the UE10. If it is determined that the handover has failed, it can be determined.
- the control unit 23B determines that the PCI value of Cell B is the PCI of another cell adjacent to Cell A. It is determined that PCI Confusion that overlaps with the value has occurred.
- control unit 23B can determine that the handover source of the UE 10 is Cell A from the Handover request message.
- control unit 23B may perform the determination of PCI confusion only in the following cases (A) or (B).
- A) When the small cell base station 20B cannot directly acquire neighbor information indicating a neighbor cell adjacent to the cell A from the macro cell base station 20A via a connection line such as an X2 interface (B) the small cell base station When 20B cannot recognize a part of the neighbor cell adjacent to Cell A because the neighbor information indicating the neighbor cell adjacent to Cell A acquired from the macrocell base station 20A is insufficient.
- the case where the information is insufficient means, for example, the case where the neighbor information acquired from the macrocell base station 20A indicates only the neighbor cell that has established the X2 interface among the neighbor cells adjacent to Cell A. .
- whether or not it corresponds to (B) can be determined, for example, based on whether or not the number of neighbor cells indicated by the neighbor information acquired from the macrocell base station 20A is equal to or less than a predetermined number.
- control unit 23B may perform the PCI Confusion determination at an arbitrary timing, for example, periodically. Alternatively, as a result of counting the number of failed handovers, the determination of PCI Confusion may be made when the number of times is a predetermined number or more.
- control unit 23B determines that the PCI value of Cell B is causing a PCI Confusion overlapping with the PCI value of another cell adjacent to Cell A, the control unit 23B cancels the PCI Confusion.
- control unit 23B autonomously reselects the PCI value of Cell B.
- control unit 23B excludes the current PCI value and the PCI value selected several times in the past from the reselection candidates, and reselects the PCI values from the remaining reselection candidates.
- control unit 23B requests the external server to assign a new PCI value without autonomously reselecting the PCI value of Cell B, and the external server that received the request sends a new PCI value to Cell B. May be assigned. In that case, it is desirable for the external server to have information on neighboring cells adjacent to Cell B as a database.
- control unit 23B of the small cell base station 20B sets the PCI value of Cell B and the Cell A based on the number of times the handover from Cell A to Cell B of the UE 10 has failed. Eliminates the overlap (PCI Confusion) between PCI values of other adjacent cells and PCI values.
- macrocell base station 20A can request
- control unit 23B of the small cell base station 20B allows the PCI value of Cell ⁇ ⁇ ⁇ ⁇ ⁇ B to be adjacent to Cell A when the number of failed handovers from Cell A to Cell B of the UE 10 is equal to or greater than a predetermined number. It is determined that a PCI Confusion that overlaps with the PCI value of another cell has occurred.
- the control unit 23B determines that PCI confusion is occurring, the controller 23B resolves PCI confusion by autonomously reselecting a PCI value or requesting an external server to assign a new PCI value. To do. Note that PCI value reselection may be performed by another cell adjacent to Cell A.
- the macro cell base station 20A transmits a Handover Request message to one base station forming a handover destination candidate cell. However, a mechanism is adopted in which a handover destination candidate cell is a plurality of cells (PCI may be different), and the macro cell base station 20A transmits a Handover Request message to a plurality of base stations that respectively form the plurality of cells.
- the small cell base station 20C determines that PCI Confusion has occurred.
- FIG. 7 shows an example of the configuration of the small cell base station 20C of the present embodiment.
- the small cell base station 20C includes a communication unit 21C, a communication status acquisition unit 22C, and a control unit 23C.
- FIG. 7 shows only the essential components extracted from the components in the small cell base station 20C, and other components are omitted.
- 21 C of communication parts communicate various messages etc. between UE10, macrocell base station 20A, small cell base station 20B, and MME30.
- the communication status acquisition unit 22C acquires the communication status such as various messages in the small cell base station 20C.
- the control unit 23C resolves the PCI value overlap (PCIfusionConfusion) between the PCI value of Cell ⁇ C and the PCI value of other cells based on the number of receptions of the RRC Connection Reestablishment Request message received from the UE10.
- PCIfusionConfusion PCI value overlap
- control unit 23 ⁇ / b> C counts the number of times of receiving the RRC Connection Reestablishment Request message from the UE 10.
- control unit 23C determines that the PCI value of the Cell C is causing a PCI Confusion that overlaps with the PCI value of another cell when the number of times of reception of the RRC Connection Reestablishment Request message from the UE 10 is equal to or greater than a predetermined number. To do.
- control unit 23C may count the number of receptions only when a specific RRC Connection Re-establishment Request message is received instead of all RRC Connection Re-establishment Request messages.
- the control unit 23C may count the number of receptions only for the RRC Connection Re-establishment Request message in which the PCI value set in the physCellId included in ReestabUE-Identity is Cell A.
- the physCellId indicates the PCI value of the cell to which the UE 10 was connected before the handover failure. For example, in FIG. 4, since the cell that the UE 10 has connected to before the handover failure is Cell A, the physCellId describes the PCI value of Cell A. In this case, when the number of receptions is equal to or greater than the predetermined number, the control unit 23C determines that the PCI value of Cell C causes a PCI Confusion that overlaps with the PCI value of another cell adjacent to Cell A.
- the control unit 23C may perform the PCI confusion determination only in the following cases (A) or (B).
- A) When the small cell base station 20C cannot directly acquire the neighbor information indicating the neighbor cell adjacent to the cell A from the macro cell base station 20A via a connection line such as an X2 interface (B) the small cell base station When 20C cannot recognize a part of the neighbor cell adjacent to Cell A because the neighbor information indicating the neighbor cell adjacent to Cell A acquired from the macro cell base station 20A is insufficient.
- the definition of “insufficient” and the method for determining whether or not it corresponds to (B) are the same as in the first embodiment.
- the control unit 23 ⁇ / b> C may count the number of receptions only for RRC Connection Re-establishment Request messages in which ReestablishmentCause is set to handoverFailure or reconfigurationFailure.
- ReestablishmentCause indicates the cause of RRC ⁇ Connection re-establishment, and describes handoverFailure (failure of handover), reconfigurationFailure (failure of reconfiguration of RRC Connection), and the like, as shown in FIG.
- handoverFailure or reconfigurationFailure is described in ReestablishmentCause.
- the control unit 23C determines that the PCI value of Cell C has caused PCI ⁇ ⁇ Confusion overlapping with the PCI value of other cells.
- the control unit 23C receives the RRC Connection Re-establishment Request message only when the PCI value set in the physCellId included in the ReestabUE-Identity is Cell A and the ReestablishmentCause is set to handoverFailure or reconFigurationFailure. May be counted. In this case, when the number of receptions is equal to or greater than the predetermined number, the control unit 23C determines that the PCI value of Cell C causes a PCI Confusion that overlaps with the PCI value of another cell adjacent to Cell A.
- control unit 23C may perform PCI Confusion determination at an arbitrary timing, for example, periodically.
- control unit 23C determines that the PCI value of the Cell C is causing PCI C Confusion, and the process for canceling the PCI C Confusion is the same as that in the first embodiment.
- the control unit 23C of the small cell base station 20C calculates the PCI value of the Cell C and the PCI value of another cell based on the number of receptions of the RRC / Connection / Reestablishment / Request message received from the UE 10. Eliminate PCI duplication (PCI Confusion).
- the control unit 23C of the small cell base station 20C when the number of times of reception of the RRCPCIConnection Reestablishment Request message from the UE 10 is a predetermined number or more, the Cell C PCI value overlaps with the PCI value of another cell. It is determined that a PCI Confusion is occurring.
- the controller 23C determines that PCI confusion is occurring, the controller 23C resolves PCI confusion by autonomously reselecting a PCI value or requesting an external server to assign a new PCI value. To do. Note that reselection of the PCI value may be performed by another cell. (2-3) Third Embodiment In the second embodiment, the small cell base station 20C determines the PCI confusion using the number of times of reception of the RRC Connection Reestablishment Request message from the UE 10.
- the cause may be Too Late Late or HO Early Early.
- the small cell base station 20C determines that the reception count of the RRC Connection Reestablishment Request message is counted from Too Late. Excludes RRC Connection Reestablishment Request messages originating from HO or Too Early HO.
- FIG. 8 shows an example of a sequence when the handover from Cell ⁇ ⁇ ⁇ ⁇ ⁇ C to Cell A of UE 10 is caused by Too Early HO and a method for excluding the RRC Connection Reestablishment Request message caused by this Too Early HO. .
- the operation is started from the state where the Serving10Cell of the UE 10 is Cell C.
- the small cell base station 20C that forms Cell C that is a Serving Cell of UE 10 transmits a Measurement Control message instructing UE 10 to measure reception quality of a neighbor cell adjacent to Cell C. (Step C1).
- the UE 10 measures the reception quality of the neighbor cell adjacent to the Cell C, and reports the PCI value of the handover destination candidate cell having good reception quality among the neighbor cells to the small cell base station 20C.
- a Report message is transmitted (step C2).
- PCI value 142 of Cell A is reported.
- the small cell base station 20C stores the PCI value of the cell and the ECGI value in association with each other, and here, it is assumed that the ECGI value of Cell A is stored in association with the PCI value 142.
- the small cell base station 20C transmits a Handover request message for requesting a handover from the UE 10 to Cell A to the macro cell base station 20A forming Cell A (step C3).
- the Handover Request message is transmitted to the macro cell base station 20A that forms the correct Cell A that is a handover destination candidate.
- the macro cell base station 20A transmits a Handover Request Acknowledgment message for accepting the handover of the UE 10 to the small cell base station 20C (step C4).
- the small cell base station 20C transmits an RRCUEConnection Reconfiguration message instructing the UE 10 to reconfigure the RRC Connection with the handover destination candidate cell (step C5).
- the Handover request message in Step C3 is transmitted to the macro cell base station 20A that forms the correct Cell A that is a handover destination candidate of the UE 10.
- the UE 10 completes the reconfiguration of the RRC connection with the Cell A, and transmits an RRC Connection Reconfiguration Complete message notifying the completion of the reconfiguration of the RRC Connection to the macro cell base station 20A (step C6).
- Serving Cell of UE10 is switched from Cell C to Cell A.
- steps A7 to A9 in FIG. 3 Thereafter, generally the same processing as steps A7 to A9 in FIG. 3 is performed.
- out of synchronization (Out of ⁇ Sync) occurs between UE10 and Cell A due to the UE 10's handover to Cell A being too early. Therefore, the UE 10 transmits an RRCRRConnection Reestablishment Request message to the small cell base station 20C that forms the Cell C that was the ServingServCell most recently (step C7).
- Serving Cell of UE10 switches from Cell A to Cell C again.
- the RRC Connection Reestablishment Request message in Step C7 is attributed to Too Early HO.
- Too Early HO may be erroneously determined as PCI Confusion.
- the control unit 23C when receiving the RRCCConnectionRRReestablishment Request message from the UE 10, the control unit 23C has transmitted a Handover Request message requesting a handover from the Cell C of the UE 10 to the Cell10A within a predetermined time before the reception. Judge whether there is.
- control unit 23C starts a timer after transmitting the Handover request message in Step C3, and determines that there is a record if the timer value at the time of receiving the RRC Connection Connection Reestablishment Request message in Step C7 is equal to or less than a predetermined time. To do.
- control unit 23C excludes the RRC Connection Reestablishment Request message in Step C7 as being caused by Too Early HO, and does not count the number of times the RRC Connection Reestablishment Request message is received.
- the control unit 23C determines that the RRC Connection Reestablishment Request message in Step C7 is caused by PCI Confusion, and counts the number of times the RRC Connection Reestablishment Request message is received. (2-3-2) Too Late HO Next, Too Late HO will be described.
- FIG. 9 shows an example of a sequence in the case where the handover from Cell A to Cell C of UE 10 is caused by Too Late HO and a method for excluding the RRC Connection Reestablishment Request message caused by this Too Late HO. .
- the operation is started from the state where the Serving Cell of the UE 10 is Cell A.
- the macro cell base station 20A that forms Cell A which is the Serving Cell of UE 10, transmits a Measurement Control message instructing UE 10 to measure the reception quality of a neighbor cell adjacent to Cell A ( Step D1).
- UE10 measures the reception quality of the neighbor cell adjacent to Cell A, and reports the PCI value of the handover destination candidate cell having good reception quality among these neighbor cells to macro cell base station 20A.
- a message is transmitted (step D2).
- PCI value 84 of Cell C is reported.
- the macro cell base station 20A stores the PCI value of the cell and the ECGI value in association with each other, and here stores the ECGI value of Cell ⁇ C in association with the PCI value 84.
- the macro cell base station 20A transmits a Handover request message for requesting handover of the UE 10 to the Cell C to the small cell base station 20C forming the Cell C (step D3).
- the Handover request message is transmitted to the small cell base station 20C forming the correct Cell C that is the handover destination candidate.
- the small cell base station 20C transmits a Handover Request Acknowledgment message for accepting the handover of the UE 10 to the macro cell base station 20A (step D4).
- the macro cell base station 20A cannot transmit an RRC10Connection Reconfiguration message instructing the UE 10 to reconfigure the RRC Connection with the handover destination candidate cell (step D5).
- the UE 10 transmits an RRC Connection Reestablishment Request message to the small cell base station 20C forming the Cell C that is a handover destination candidate (Step D6).
- Serving Cell of UE10 switches from Cell A to Cell C.
- the RRC Connection Reestablishment Request message in Step D6 is caused by Too Late HO.
- Too Late HO may be erroneously determined as PCI Confusion.
- the control unit 23C when receiving the RRCCConnectionRRReestablishment Request message from the UE 10, the control unit 23C has received a Handover Request message requesting a handover from the Cell A to the Cell C of the UE 10 within a predetermined time before the reception. Judge whether there is.
- control unit 23C starts a timer after receiving the Handover Request message in Step D3, and determines that there is a record if the timer value at the time of receiving the RRC Connection Reestablishment Request message in Step D6 is equal to or less than a predetermined time. To do.
- control unit 23C excludes the RRC Connection Reestablishment ⁇ Request message in step D6 as being caused by Too Late HO, and does not count the number of receptions of the RRC Connection Reestablishment Request message.
- control unit 23C determines that the RRC Connection Reestablishment Request message in Step D6 is caused by PCI Confusion, and counts the number of times the RRC Connection Reestablishment Request message is received.
- the control unit 23C of the small cell base station 20C requests handover from Cell C to Cell C within the nearest predetermined time upon reception of the RRC C Connection Reestablishment C Request message. If there is a record of sending a Request message, do not count the number of RRC Connection Reestablishment ⁇ ⁇ ⁇ ⁇ ⁇ Request messages received.
- the control unit 23C when receiving the RRC Connection Reestablishment Request message, the control unit 23C has received a Handover Request message requesting a handover from Cell A to Cell C within a predetermined time immediately before the RRC Connection Reestablishment Request message. Does not count the number of received messages.
- RRC Connection Reestablishment Request messages caused by Too Late HO or Too Early HO can be excluded from the count of RRC Connection Reestablishment Request message reception. It can suppress judging.
- the small cell base station determines whether PCI Confusion has occurred, but the present invention is not limited to this.
- another type of base station such as a macro cell base station may determine whether PCI Confusion is occurring between a neighbor cell adjacent to the own cell or a neighbor cell adjacent to the neighbor cell. .
- the base station determines whether PCI ⁇ Confusion has occurred, but the present invention is not limited to this.
- an external communication device such as a SON (Self Organizing Network) server may determine whether PCI Confusion is occurring.
- the external communication device acquires information on the communication status at the base station from the base station, and based on this, determines whether PCI Confusion has occurred in the PCI value of the base station. Further, the external communication device notifies the base station that PCI Confusion is occurring.
- PCI is taken as an example, but the present invention is not limited to this, and can be applied to other cell identifiers used locally.
- cell identifiers used locally include primary scrambling codes of 3G WCDMA (Third Generation Wideband Code Division Multiple ⁇ ⁇ ⁇ Access).
- the cells A to C are LTE E-UTRAN cells, but the present invention is not limited to this.
- the cells A to C may be arbitrary cells such as a 3G WCDMA cell, a CDMA2000 cell, and a 2G GSM (Second Generation Global System for Mobile communications) cell.
- the handover of the UE 10 may be X2 Handover, S1 handover, or Inter RAT Handover.
- FIG. 10 shows a schematic configuration of the communication apparatus of the present invention.
- the communication apparatus 100 of the present invention includes a communication status acquisition unit 101 and a control unit 102.
- a radio communication system having a terminal, a first base station that forms a first cell, and a second base station that forms a second cell adjacent to the first cell, It is applied as a second base station or SON server.
- the communication status acquisition unit 101 corresponds to the communication status acquisition unit 22B of the first embodiment (FIG. 6) and the communication status acquisition unit 22C of the second and third embodiments (FIG. 7).
- the communication status such as various messages in the base station 2 is acquired.
- the communication status acquisition unit 101 acquires the communication status at the second base station from the second base station.
- the control unit 102 corresponds to the control unit 23B of the first embodiment (FIG. 6) and the control unit 23C of the second and third embodiments (FIG. 7).
- control unit 102 determines the cell identifier of the second cell and the cell identifiers of other cells adjacent to the first cell based on the number of times that the handover of the terminal from the first cell to the second cell has failed.
- the cell identifier duplication (PCI Confusion) is eliminated (corresponding to the first embodiment).
- control unit 102 determines whether the second base station has received a message requesting re-establishment of the RRC connection from the terminal, based on the number of receptions of the cell identifier of the second cell and the cell identifier of another cell.
- the duplication of identifiers (PCI Confusion) is eliminated (corresponding to the second embodiment).
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Abstract
Description
端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムにおける通信装置であって、
前記第2の基地局における通信状況を取得する通信状況取得部と、
前記第2の基地局が、前記端末から、RRCコネクションの再確立を要求する第1のメッセージを受信した受信回数に基づいて、前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する制御部と、を有する。
端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムにおける通信装置であって、
前記第2の基地局における通信状況を取得する通信状況取得部と、
前記端末の前記第1のセルから前記第2のセルへのハンドオーバが失敗した回数に基づいて、前記第2のセルのセル識別子と、前記第1のセルに隣接する他セルのセル識別子と、のセル識別子の重複を解消する制御部と、を有する。
端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムであって、
前記第2の基地局における通信状況を取得する通信状況取得部と、
前記第2の基地局が、前記端末から、RRCコネクションの再確立を要求する第1のメッセージを受信した受信回数に基づいて、前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する制御部と、を有する。
端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムであって、
前記第2の基地局における通信状況を取得する通信状況取得部と、
前記端末の前記第1のセルから前記第2のセルへのハンドオーバが失敗した回数に基づいて、前記第2のセルのセル識別子と、前記第1のセルに隣接する他セルのセル識別子と、のセル識別子の重複を解消する制御部と、を有する。
端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムにおける通信装置が行う通信方法であって、
前記第2の基地局における通信状況を取得し、
前記第2の基地局が、前記端末から、RRCコネクションの再確立を要求する第1のメッセージを受信した受信回数に基づいて、前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する。
端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムにおける通信装置が行う通信方法であって、
前記第2の基地局における通信状況を取得し、
前記端末の前記第1のセルから前記第2のセルへのハンドオーバが失敗した回数に基づいて、前記第2のセルのセル識別子と、前記第1のセルに隣接する他セルのセル識別子と、のセル識別子の重複を解消する。
まず、本発明の無線通信システムの全体構成について説明する。
(2)本発明の実施形態
(2-1)第1の実施形態
本実施形態は、図2に示した無線通信システムにおいて、スモールセル基地局20BがPCI Confusionが起きていることを判定するものである。
(A)スモールセル基地局20Bが、マクロセル基地局20Aから、Cell Aに隣接するネイバーセルを示すネイバー情報を、X2インタフェースといった接続回線等を経由して直接取得できない場合
(B)スモールセル基地局20Bが、マクロセル基地局20Aから取得した、Cell Aに隣接するネイバーセルを示すネイバー情報が不十分のために、Cell Aに隣接するネイバーセルの一部を認識できない場合
なお、(B)のネイバー情報が不十分な場合とは、例えば、マクロセル基地局20Aから取得したネイバー情報が、Cell Aに隣接するネイバーセルのうち、X2インタフェースを確立しているネイバーセルのみを示している場合等を言う。また、(B)に該当するか否かは、例えば、マクロセル基地局20Aから取得したネイバー情報が示すネイバーセルの数が、所定数以下であるか否かで判断することができる。
(2-2)第2の実施形態
第1の実施形態においては、マクロセル基地局20Aが、ハンドオーバ先候補のセルを形成する1台の基地局にHandover Requestメッセージを送信している。しかし、ハンドオーバ先候補のセルを複数のセル(PCIが異なってもよい)とし、マクロセル基地局20Aが、これら複数のセルをそれぞれ形成する複数の基地局にHandover Requestメッセージを送信する仕組みが講じられていることも考えられる。この場合、第1の実施形態においては、Handover Requestメッセージを受信したものの、RRC Connection Reconfiguration Completeメッセージを受信しない基地局が数多く発生することになる。そうすると、これら基地局は、実際にはPCI Confusionが起きていないにもかかわらず、PCI Confusionが起きていると誤判定してしまうと予測される。
(A)スモールセル基地局20Cが、マクロセル基地局20Aから、Cell Aに隣接するネイバーセルを示すネイバー情報を、X2インタフェースといった接続回線等を経由して直接取得できない場合
(B)スモールセル基地局20Cが、マクロセル基地局20Aから取得した、Cell Aに隣接するネイバーセルを示すネイバー情報が不十分のために、Cell Aに隣接するネイバーセルの一部を認識できない場合
なお、(B)の「不十分」の定義や(B)に該当するか否かの判断方法は、第1の実施形態と同様である。
(2-3)第3の実施形態
第2の実施形態においては、スモールセル基地局20Cは、UE10からRRC Connection Reestablishment Requestメッセージを受信した受信回数を用いて、PCI Confusionの判定をしていた。
(2-3-1)Too Early HOについて
まず、Too Early HOについて説明する。
(2-3-2)Too Late HOについて
次に、Too Late HOについて説明する。
(3)本発明の概要
最後に、本発明の概要を説明する。
Claims (14)
- 端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムにおける通信装置であって、
前記第2の基地局における通信状況を取得する通信状況取得部と、
前記第2の基地局が、前記端末から、RRCコネクションの再確立を要求する第1のメッセージを受信した受信回数に基づいて、前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する制御部と、を有する通信装置。 - 前記制御部は、
前記第2の基地局が、前記端末から、前記端末がハンドオーバ失敗前に接続していたセルが前記第1のセルであることを示す前記第1のメッセージを受信した受信回数が所定値以上である場合、前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する、請求項1に記載の通信装置。 - 前記制御部は、
前記第2の基地局が、前記端末から、前記RRCコネクションの再確立の原因がハンドオーバの失敗または前記RRCコネクションの再構成の失敗であることを示す前記第1のメッセージを受信した受信回数が所定値以上である場合、前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する、請求項1に記載の通信装置。 - 前記制御部は、
前記第2の基地局が、前記端末から、前記端末がハンドオーバ失敗前に接続していたセルが前記第1のセルであることを示し、かつ、前記RRCコネクションの再確立の原因がハンドオーバの失敗または前記RRCコネクションの再構成の失敗であることを示す前記第1のメッセージを受信した受信回数が所定値以上である場合、前記第2のセルのセル識別子と、前記第1のセルに隣接する他セルのセル識別子と、のセル識別子の重複を解消する、請求項1に記載の通信装置。 - 前記制御部は、
前記第2の基地局が、前記端末から前記第1のメッセージを受信した時に、該受信前の所定時間内に、前記端末の前記第2のセルから前記第1のセルへのハンドオーバを要求する第2のメッセージを、前記第1の基地局に送信した実績がある場合、前記第1のメッセージの受信によっても前記受信回数をカウントしない、請求項1から4のいずれか1項に記載の通信装置。 - 前記制御部は、
前記第2の基地局が、前記端末から前記第1のメッセージを受信した時に、該受信前の所定時間内に、前記端末の前記第1のセルから前記第2のセルへのハンドオーバを要求する第3のメッセージを、前記第1の基地局から受信した実績がある場合、前記第1のメッセージの受信によっても前記受信回数をカウントしない、請求項1から5のいずれか1項に記載の通信装置。 - 端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムにおける通信装置であって、
前記第2の基地局における通信状況を取得する通信状況取得部と、
前記端末の前記第1のセルから前記第2のセルへのハンドオーバが失敗した回数に基づいて、前記第2のセルのセル識別子と、前記第1のセルに隣接する他セルのセル識別子と、のセル識別子の重複を解消する制御部と、を有する通信装置。 - 前記制御部は、
前記第2の基地局が、前記第1の基地局から、前記端末の前記第1のセルから前記第2のセルへのハンドオーバを要求する第1のメッセージを受信した後、所定時間内に、前記端末からRRCコネクションの再構成の完了を通知する第2のメッセージを受信しなかった場合、前記端末の前記第1のセルから前記第2のセルへのハンドオーバが失敗したと判定する、請求項7に記載の通信装置。 - 前記制御部は、
前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する場合、前記第2のセルのセル識別子を再選択する、請求項1から8のいずれか1項に記載の通信装置。 - 前記制御部は、
前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する場合、前記第2のセルの新たなセル識別子の割り当てを外部サーバに要求する、請求項1から8のいずれか1項に記載の通信装置。 - 端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムであって、
前記第2の基地局における通信状況を取得する通信状況取得部と、
前記第2の基地局が、前記端末から、RRCコネクションの再確立を要求する第1のメッセージを受信した受信回数に基づいて、前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する制御部と、を有する無線通信システム。 - 端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムであって、
前記第2の基地局における通信状況を取得する通信状況取得部と、
前記端末の前記第1のセルから前記第2のセルへのハンドオーバが失敗した回数に基づいて、前記第2のセルのセル識別子と、前記第1のセルに隣接する他セルのセル識別子と、のセル識別子の重複を解消する制御部と、を有する無線通信システム。 - 端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムにおける通信装置が行う通信方法であって、
前記第2の基地局における通信状況を取得し、
前記第2の基地局が、前記端末から、RRCコネクションの再確立を要求する第1のメッセージを受信した受信回数に基づいて、前記第2のセルのセル識別子と他セルのセル識別子とのセル識別子の重複を解消する、通信方法。 - 端末と、第1のセルを形成する第1の基地局と、前記第1のセルに隣接する第2のセルを形成する第2の基地局と、を有する無線通信システムにおける通信装置が行う通信方法であって、
前記第2の基地局における通信状況を取得し、
前記端末の前記第1のセルから前記第2のセルへのハンドオーバが失敗した回数に基づいて、前記第2のセルのセル識別子と、前記第1のセルに隣接する他セルのセル識別子と、のセル識別子の重複を解消する、通信方法。
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JP2017188769A (ja) * | 2016-04-05 | 2017-10-12 | 株式会社Nttドコモ | 情報処理装置及び基地局 |
CN107371198A (zh) * | 2016-05-12 | 2017-11-21 | 中兴通讯股份有限公司 | 小区切换的方法和*** |
JP2020167464A (ja) * | 2019-03-28 | 2020-10-08 | Kddi株式会社 | 設定装置、携帯端末システム、設定方法、およびプログラム |
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CN107371198B (zh) * | 2016-05-12 | 2020-07-10 | 中兴通讯股份有限公司 | 小区切换的方法和*** |
JP2020167464A (ja) * | 2019-03-28 | 2020-10-08 | Kddi株式会社 | 設定装置、携帯端末システム、設定方法、およびプログラム |
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CN106717061A (zh) | 2017-05-24 |
CN106717061B (zh) | 2020-03-27 |
US20170289865A1 (en) | 2017-10-05 |
US10051528B2 (en) | 2018-08-14 |
JP6380545B2 (ja) | 2018-08-29 |
JPWO2016047439A1 (ja) | 2017-06-29 |
EP3200506B1 (en) | 2022-01-12 |
EP3200506A1 (en) | 2017-08-02 |
EP3200506A4 (en) | 2018-03-28 |
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