WO2013108346A1 - 基地局、通信システム、通信方法、およびプログラムの記録媒体 - Google Patents
基地局、通信システム、通信方法、およびプログラムの記録媒体 Download PDFInfo
- Publication number
- WO2013108346A1 WO2013108346A1 PCT/JP2012/008209 JP2012008209W WO2013108346A1 WO 2013108346 A1 WO2013108346 A1 WO 2013108346A1 JP 2012008209 W JP2012008209 W JP 2012008209W WO 2013108346 A1 WO2013108346 A1 WO 2013108346A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- list
- cell
- adjacent
- cells
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000004891 communication Methods 0.000 title claims description 49
- 238000005457 optimization Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
-
- 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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00835—Determination of neighbour cell lists
-
- 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
- H04W36/34—Reselection control
- H04W36/38—Reselection control by fixed network equipment
- H04W36/385—Reselection control by fixed network equipment of the core network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
-
- 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
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
Definitions
- the present invention relates to a base station, a communication system including the base station, a communication method, and a program recording medium.
- a relay base station of a mobile network specified in 3GPP (3rd Generation Partnership Project) is connected to the base station through an Un link to form a cell.
- the base station that accommodates the relay base station is called Donner eNodeB (DeNB).
- the DeNB transfers data between the core network and the relay base station. The transfer data is transmitted via the S11 link.
- mobile networks are mainly composed of macro base stations.
- Macro base stations can cover a wide area, so the number of base stations installed by carriers was small.
- the number of mobile terminals that frequently connect to the Internet, such as smartphones, has increased, necessitating the installation of many base stations.
- the neighbor cell list refers to a list that is referred to when determining a destination cell when a mobile terminal in the cell is in an idle state. That is, the adjacent cell list of a certain cell is a list of cells adjacent to a certain cell.
- the neighboring cell list is referred to when the base station determines a handover destination cell when a mobile terminal in the cell is in an RRC (Radio Resource Control) connected state.
- RRC Radio Resource Control
- the neighbor cell list is broadcast in the cell by the base station.
- Non-Patent Document 1 describes that a certain base station receives information on a neighboring cell list from another base station.
- Patent Documents 1 and 2 are cited as documents describing related technologies.
- Patent Document 1 discloses a maintenance server that collects information from each base station and transmits the information to an optimization terminal, and an optimization terminal that optimizes a neighboring cell list based on the received information.
- Patent Document 2 discloses a technique related to optimization of a neighboring cell list when a base station is newly established.
- a newly established base station transmits a notification to an adjacent base station.
- the base station that has received the notification returns a response when the distance from the newly established base station is less than or equal to the threshold value.
- the newly established base station receives the response and writes the optimum neighbor cell list in the neighbor cell list in order from the base station with the shortest distance.
- Non-Patent Document 1 a case where a cell A receives a neighbor cell list from another cell B using the technology described in Non-Patent Document 1. It is assumed that the cell A is a cell managed by the base station A connected to the core network A. At this time, the neighboring cell list of the cell B may include a cell managed by a base station connected to a core network other than the core network A.
- a mobile terminal to be handed over from cell A may hand over to a cell managed by a base station connected to other than core network A.
- the time required for the handover procedure of the mobile terminal becomes longer than the handover between cells belonging to the same core network.
- An object of the present invention is to provide a base station, a communication system, a communication method, and a program recording medium that can solve the above-described problems.
- the base station is adjacent to the base station, storage means for storing a list in which a cell adjacent to a cell managed by the base station is associated with an identifier for identifying a core network to which the adjacent cell belongs. It comprises receiving means for receiving a list stored in the adjacent base station from a base station, and control means for using the received list as a list of cells managed by the base station.
- a communication system is a communication system comprising a plurality of base stations, wherein the base station identifies a cell adjacent to a cell managed by the base station, an identifier for identifying a core network to which the adjacent cell belongs.
- Storage means for storing the associated list; receiving means for receiving a list stored in the adjacent base station from a base station adjacent to the base station; and a cell managed by the own base station. Control means used as a list.
- the communication method receives a list in which an adjacent base station stores a cell adjacent to a cell managed by the adjacent base station and an identifier for identifying a core network to which the adjacent cell belongs.
- the received list is used as a list of cells managed by the base station.
- the recording medium of the program according to the present invention includes a list in which cells adjacent to a cell managed by the adjacent base station stored in an adjacent base station are associated with an identifier for identifying a core network to which the adjacent cell belongs.
- a program for causing a computer to execute a process of receiving and a process of using the received list as a list of cells managed by the base station is recorded.
- FIG. 1 is a diagram illustrating a configuration example of a base station 1000 according to the first embodiment of the present invention.
- the base station 1000 includes a storage unit 1001, a receiving unit 1002, and a control unit 1003.
- the base station 1000 manages cells.
- the storage unit 1001 stores a list of cells (not shown in the figure) adjacent to the base station 1000.
- the receiving unit 1002 receives a list stored in the adjacent base station from the adjacent base station.
- the control unit 1003 uses the received list as a list of cells managed by the base station 1000.
- FIG. 2 is a diagram showing an example of the list 1100 stored in the storage unit 1001.
- the list 1100 stores adjacent cells in association with identifiers that identify the core network to which each cell belongs.
- cell #a indicates that it belongs to the core network identified by the identifier “A”.
- FIG. 3 is a flowchart showing an operation flow according to the first embodiment.
- the receiving means 1002 receives a list stored in an adjacent base station from an adjacent base station (S1001).
- control unit 1003 uses the received list as a list of cells managed by the base station 1000 (S1002).
- the base station 1000 uses a list of adjacent base stations as a list of cells managed by the base station 1000.
- the list stores an identifier for identifying the core network to which each cell belongs.
- FIG. 4 is a diagram illustrating a configuration example of a communication system according to the second embodiment.
- the communication system according to the second embodiment includes a mobility management entity (MME) 310, a saving-gateway (S-GW) 320, a base station 330, and a base station 340.
- the communication system further includes a relay base station 350, a mobile terminal 361, a mobile terminal 362, and a mobile terminal 363.
- Base station 330, base station 340, and pico base station 370 are connected to MME 310 and S-GW 320 via a network.
- base stations are simply referred to as base stations.
- mobile terminal 361, the mobile terminal 362, and the mobile terminal 363 are simply referred to as mobile terminals unless otherwise distinguished.
- the base station 330 there are three mobile terminals in the example of FIG. 4 and are connected to the base station 330, the relay base station 350, and the pico base station 370, respectively.
- the communication system shown in FIG. 4 may be configured by any network.
- a network using LTE Long Term Evolution
- LTE Long Term Evolution
- the MME 310 has a function of transmitting and receiving control signals to and from the base station via the S1-MME link.
- the S-GW 320 has a function of transmitting and receiving user data to and from the base station via the S1-U link.
- Each base station manages a cell.
- the base station accommodates the relay base station.
- the base station 340 accommodates the relay base station 350.
- the base station 340 that accommodates the relay base station 350 is also called DeNB as described above.
- the base stations are connected by an X2 link.
- the pico base station 370 has the same function as that of the base station 330, but has a smaller transmission power and a smaller coverage area than the base station 330.
- the base station 340 and the relay base station 350 are connected by an Un link.
- the base station 340 has a data transfer function between the MME 310 and the S-GW 320 and the relay base station 350. Data between the MME 310 and the S-GW 320 and the relay base station 350 is transferred via the S11 link.
- each device shown in FIG. 4 has a number of functions other than those described above, but a detailed description of the functions is omitted.
- FIG. 5 shows a configuration example of the pico base station 370. 5 is applicable not only to the pico base station 370 but also to other base stations such as the base station 330, the base station 340, or the relay base station 350.
- the configuration and operation of the second embodiment will be described using the pico base station 370 as an example unless otherwise specified.
- the configuration and operation of the second embodiment are not limited to the pico base station 370 but can also be applied to the base station 330, the base station 340, and the relay base station 350.
- the pico base station 370 may manage a plurality of cells. However, in the following description, the pico base station 370 will be described as managing one cell for simplification of description.
- the pico base station 370 includes a storage unit 371, a reception unit 372, a control unit 373, a selection unit 374, and a measurement unit 375.
- the storage unit 371 stores a neighbor cell list of cells managed by the pico base station 370.
- the neighbor cell list is a list indicating cells that are candidates for the handover destination from the pico base station 370.
- the adjacent cell list stored in the storage unit 371 will be described in detail later.
- the receiving unit 372 receives an adjacent cell list of a base station adjacent to a cell managed by the pico base station 370.
- the control unit 373 uses the neighboring cell list of the other base station received by the receiving unit 372 as the neighboring cell list of the cell managed by the pico base station 370.
- the selection unit 374 selects a base station that receives the neighboring cell list based on the cell state of the neighboring base station.
- the selection unit 374 receives the cell state of the adjacent base station from the adjacent cell list or the measurement unit 375 of the storage unit 371.
- the measurement unit 375 measures information such as the number of handovers of adjacent cells and a handover failure rate, and outputs the information to the selection unit 374 or the storage unit 371.
- FIG. 6 is a diagram illustrating an example of the neighboring cell list 376 stored in the storage unit 371.
- cells #a, #b, #c, #d, #f, and #e are listed as neighboring cells.
- an identifier (core network ID) of a core network to which each cell belongs is associated with each cell.
- cell #a belongs to the core network identified by the identifier “A”. More precisely, the core network ID “A” indicates that the base station managing the cell #a belongs to the core network identified by the identifier “A”.
- a core network ID for example, a core network ID (hereinafter referred to as CN-ID), MME ID, GUMMEI (Globally Unique MME ID), or S-GW ID may be used. Any identifier of the core network may be used as long as it can be identified which core network is connected.
- CN-ID is used in the neighbor cell list 376 as an identifier for identifying the core network.
- the CN-ID is associated with each cell, but other information may be associated with each cell. For example, the number of handovers for each cell, handover success rate, handover failure rate, reception quality for each cell, and the like may be stored corresponding to each cell.
- FIG. 7 is a flowchart showing the operation of the pico base station 370.
- the selection unit 374 selects another base station that receives the neighboring cell list (S101).
- the selection unit 374 has selected the base station 330 as the base station that receives the neighbor cell list.
- the selection unit 374 requests the selected base station 330 to transmit an adjacent cell list.
- a dedicated message can be used for the transmission request of the neighboring cell list from the pico base station 370 to the base station 330. Further, instead of a dedicated message, “X2 SETUP REQUEST” or “eNB CONFIGURATION UPDATE” described in Non-Patent Document 1 may be used. Further, the pico base station 370 may request the base station 330 to directly transmit a neighbor cell list, or may indirectly request the neighbor cell list to be transmitted via the MME 310 or the like.
- the receiving unit 372 receives a neighbor cell list from the selected base station (S102).
- a dedicated message can be used for transmission of the neighboring cell list from the selected base station 330 to the pico base station 370.
- “X2 SETUP RESPONSE” or “eNB CONFIGURATION UPDATE” described in Non-Patent Document 1 may be used.
- the pico base station 370 When the receiving unit 372 receives the neighbor cell list in S102, the pico base station 370 performs the operation of S103.
- the control unit 373 optimizes the received neighboring cell list (S103). This optimization will also be described in detail later.
- control unit 373 uses the optimized neighboring cell list as the neighboring cell list of the cells managed by the pico base station 370 (S104).
- the neighboring cell list received in S102 may be used without optimization as the neighboring cell list of the own base station.
- the optimization procedure shown in S103 can be performed periodically or at some timing after S104.
- the information on the source cell and the cell information of the pico base station 370 may be simply deleted from the neighboring cell list 376.
- the receiving unit 372 of the pico base station 370 has received the neighbor cell list of the cell #b from the base station 330.
- cell #b is not described as a candidate for handover in the neighbor cell list received from base station 330. Therefore, first, the control unit 373 of the pico base station 370 adds the cell #b to the received neighboring cell list and deletes the cell managed by the pico base station 370.
- the pico base station 370 uses the created neighboring cell list as the neighboring cell list 376 of the cells managed by the pico base station 370.
- the operation content described below corresponds to S103 in FIG. However, after the series of operations up to S104 is completed, the operation described below may be performed when the neighbor cell list 376 is optimized periodically or at some timing.
- cell A the cell currently being processed is described as “cell A”.
- control unit 373 confirms the number of handovers in units of neighboring cells that have occurred in subordinate cells. At the same time, the control unit 373 confirms the content of the measurement report (Measurement Report) received from the mobile terminal (S201).
- the Measurement Report is a report of communication quality of the peripheral cells of the mobile terminal that the mobile terminal transmits to the base station. More specifically, the mobile terminal measures the communication quality in the adjacent cell of the currently communicating cell, refers to the determination condition, and determines that the measured communication quality satisfies the predetermined communication quality. In such a case, the mobile terminal transmits a Measurement Report indicating that fact to the base station. The base station that has received the Measurement Report determines that the mobile terminal should perform handover from the currently communicating cell to another cell with better communication quality according to the content of the report.
- control unit 373 determines whether a handover has occurred for the cell A described in the neighboring cell list 376 during a predetermined period (S202). If a handover has occurred for the cell A during the predetermined period, the process for the cell A ends.
- control unit 373 may repeat the series of operations from S201 again.
- the control unit 373 determines whether or not the cell A is included in the upper two cells having good reception quality in the Measurement Report received by the pico base station 370 during the predetermined period (S203).
- an indicator of reception quality for example, RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), or the like can be used.
- control unit 373 deletes the cell A from the neighboring cell list 376 and ends the process for the cell A (S205). ).
- the process proceeds to S204.
- the control unit 373 determines whether the CN-ID corresponding to the cell A is the same as the CN-ID of the core network to which the pico base station 370 is connected (S204). As a result of the determination in S204, if the CN-ID corresponding to the cell A is the same as the CN-ID of the core network to which the pico base station 370 is connected, the control unit 373 deletes the cell A from the neighboring cell list 376. The process ends without
- the control unit 373 sets the cell A to the adjacent cell Delete from the list 376 (S205).
- Another criterion may be adopted as a criterion for determining whether or not to delete cell A from the neighboring cell list 376.
- a criterion for example, whether or not the cell A needs to be deleted depends on whether or not the reception quality of the cell A is included within an arbitrary number of ranks, not whether or not it is included in the upper two cells of reception quality. It is possible to judge. It is also possible to determine whether or not deletion is necessary depending on whether the reception quality of the cell A is equal to or higher than a threshold value. In this case, when the reception quality of the cell A is equal to or higher than the threshold, the process can proceed to S204, and when the reception quality of the cell A is less than the threshold, the process can proceed to S205. is there.
- control unit 373 determines whether the CN-ID corresponding to the cell A is the same as the CN-ID of the core network to which the pico base station 370 is connected. However, as described above, the determination may be performed based on MME ID, GUMMEI, or S-GW ID instead of CN-ID.
- the cell A that does not meet the conditions in S203 or S204 is deleted from the neighboring cell list, but other operations can be performed.
- a process of preferentially leaving (not deleting) the cell A in the adjacent cell list 376 can be performed. More specifically, a method of increasing the priority of the cell A can be considered.
- the above processing is performed. Can do.
- FIG. 9 shows a state of transmission / reception of the neighboring cell list between the pico base station 370 and the base station 330.
- the pico base station 370 transmits a neighbor cell list transmission request to the base station 330 selected in S101 (S111).
- This neighbor cell list transmission request can use a dedicated message.
- “X2 SETUP REQUEST” or “eNB CONFIGURATION UPDATE” described in Non-Patent Document 1 may be used.
- the base station 330 transmits the neighbor cell list to the pico base station 370 (S112).
- a dedicated message can be used to transmit the neighbor cell list.
- “X2 SETUP RESPONSE” or “eNB CONFIGURATION UPDATE” described in Non-Patent Document 1 may be used.
- FIG. 13 An example of information transmitted from the base station 330 to the pico base station 370 in S112 is shown in FIG. 13 and FIG.
- FIG. 13 is a diagram in which “CN ID” is added to the information of “X2 SETUP RESPONSE” in Non-Patent Document 1.
- This CN ID is an identifier for identifying the core network to which the cell belongs.
- the above-mentioned CN-ID, MME ID, GUMMEI, S-GW ID, or the like may be used.
- CN IDs may be added as a list.
- “Range” in FIG. 13 describes identifiers that identify the plurality of core networks as a list.
- CN Ids indicates that a list from 1 to “max no of MMEs” and the maximum number of MMEs is prepared.
- the CN Ids may be the maximum number of CN IDs (maxnoofCNIDs), the maximum number of S-GWs (maxnoofSGWs), etc., not the maximum number of MMEs.
- eNB CONFIGURATION UPDATE in Non-Patent Document 1 may be used.
- CN-ID, MME ID, GUMMEI, S-GW ID, etc. are added to “eNB CONFIGURATION UPDATE”.
- FIG. 14 is a diagram showing details of “Served Cell Information” in FIG. 14 is divided into two drawings of FIG. 14A and FIG. 14B for the sake of convenience, FIG. 14A and FIG. 14B are combined to show the details of the information of the “Served Cell Information”.
- FIG. 14A and FIG. 14B will be collectively referred to as FIG. The same applies to FIGS. 16, 17, 19, and 20 described later.
- the information shown in FIG. 14 is obtained by adding “Cell Type” to the information of “Served Cell Information” in Non-Patent Document 1.
- This Cell Type is information indicating the size of the cell coverage area. Taking the network configuration of FIG. 3 as an example, information indicating that the coverage area is large is set for the cells of the base station 330 and the base station 340. On the other hand, in the case of the cell of the pico base station 370 or the relay base station 350, information that the coverage area is small is set.
- FIG. 16A and FIG. 16B are diagrams illustrating an example in which a CN ID is added to “Served Cell Information”. Also, as shown in FIGS. 17A and 17B, both Cell Type and CN ID can be added to “Served Cell Information”.
- FIG. 19A and FIG. 19B show an example where the CN ID is set as an option instead of M in “Served Cell Information” in FIG.
- FIG. 20A and FIG. 20B show an example in which the CN ID is set as an option instead of M in “Served Cell Information” in FIG.
- FIG. 9 shows an example in which the pico base station 370 and the base station 330 directly transmit / receive the neighbor cell list.
- the neighboring cell list may be transmitted and received via the MME 310 or the like.
- the processing flow shown in FIG. 10 is almost the same as that in FIG. 9 except that the MME 310 relays the neighboring cell list transmission request in S122 and the neighboring cell list is relayed in S124. Yes.
- a dedicated message may be used to transmit the neighboring cell list, or “X2 SETUP REQUEST” described in Non-Patent Document 1, “eNB CONFIGURATION UPDATE”, or the like may be used.
- FIG. 15 is a diagram in which a CN ID, which is one of identifiers for identifying a core network, is added to “X2 SETUP REQUEST” in Non-Patent Document 1.
- a CN ID which is one of identifiers for identifying a core network
- an MME ID, GUMMEI, S-GW ID, or the like may be used in addition to the CN ID.
- an identifier for identifying a core network such as a CN ID may be added as in FIG.
- FIG. 18 is a diagram illustrating an example in which the CN ID is set as an option instead of M in “X2 SETUP REQUEST” in FIG. 15. Even when “eNB CONFIGURATION UPDATE” is used, the CN ID can be set as an option in the same manner as in FIG.
- the base station according to the second embodiment uses the list of adjacent base stations as the adjacent cell list of the cells managed by the base station. Further, the neighbor cell list stores an identifier (CN-ID) for identifying the core network to which each cell belongs.
- CN-ID identifier
- the time required for the handover procedure becomes longer than the handover between the same core networks. Therefore, according to the second embodiment, since cells belonging to the same core network can be preferentially left in the neighboring cell list, the time required for the handover procedure of the mobile terminal can be shortened.
- FIG. 11 is a diagram illustrating the relationship between the cell of the base station 330, the base station 340, the relay base station 350, the pico base station 370, and the pico base station 380, the mobile terminal 361, and the mobile terminal 362.
- the MME 301 and the S-GW 302 are omitted.
- Each base station may have a plurality of cells, but in the example of FIG. 11, it is assumed that each base station has one cell.
- the mobile terminal 361, the pico base station 370, and the pico base station 380 are included in the cell of the base station 330.
- the mobile terminal 362, the relay base station 350, and the pico base station 380 are included in the base station 340 cell.
- the coverage areas of the relay base station 350, the pico base station 370, and the pico base station 380 are smaller than those of the base station 330 and the base station 340. Accordingly, the number of cells listed in the neighbor cell list of such a base station is inevitably reduced.
- a base station with a small coverage area such as a pico base station or a relay base station receives an adjacent cell list from a base station with a larger coverage area and uses it as its own adjacent cell list.
- the pico base station 370 receives the neighbor cell list from the base station 330 having a cell including the pico base station 370.
- the relay base station 350 receives the neighbor cell list from the base station 340 having a cell including the relay base station 350.
- the pico base station 380 included in both the base station 330 and the base station 340 selects the base station that receives the neighbor cell list from the base station 330 and the base station 340, and selects the base station.
- a neighbor cell list is received from the base station.
- the method by which the pico base stations 370 and 380 receive the neighbor cell list from the base stations 330 and 340 is substantially the same as the method of FIG. 9 and FIG. 10 described in the second embodiment, and thus description thereof is omitted. To do.
- the base station that has received the neighbor cell list transmission request sends the neighbor cell list to the requesting base station, for example, in S112 of FIG. 9, S123, and S124 of FIG. 10, it is necessary to include coverage area information. There is.
- a cell that is close in distance from geographic information or the like by cell planning is input as an initial value of the neighboring cell list of the pico base station 307.
- the measurement unit 375 measures the number of handovers and the handover failure rate as statistical information for each cell in the initial neighboring cell list.
- the statistical information measured by the measurement unit 375 is stored in a table as shown in FIG.
- the number of handovers and the handover failure rate for each neighboring cell are included as statistical information.
- the cells are arranged in the order of the number of handovers.
- a handover success rate or the like may be used as the statistical information.
- the selection unit 374 refers to the table of FIG. 12 and identifies a cell that includes a cell that the pico base station 370 has, or a cell that has the largest overlap. For example, the pico base station 370 selects a cell with the largest number of handovers and a handover failure rate less than a threshold. If the threshold value of the handover failure rate is 10%, the cell selected by the pico base station 370 is the cell #b.
- the selection unit 374 requests the base station 330 that manages the cell #b selected via the X2 link or the S1 link to transmit a neighbor cell list.
- the base station 330 transmits the neighboring cell list of the cell #b to the pico base station 370.
- the base station 330 also transmits information indicating the size of the coverage area. This information may be a unique identifier of the base station or an identifier indicating the type of base station such as a pico base station or a relay base station.
- the cell that has received the neighbor cell list transmission request is a cell of a pico base station or a relay base station, it is notified that the cell is a small cell in the coverage area when the neighbor cell list is transmitted.
- the pico base station 370 that has received the neighbor cell list can also determine not to use the received neighbor cell list. This is because the number of cells adjacent to a small cell in the coverage area is small, and there is a possibility that an adjacent cell may be missed in the pico base station 370.
- the pico base station 370 When the pico base station 370 does not use the neighboring cell list of the cell of the pico base station 380 or the relay base station 350, the following operation is performed.
- the pico base station 370 requests transmission of the neighbor cell list in order from the cell with the highest priority in the statistical information list of the neighbor cells of the cell managed by the pico base station 370.
- the pico base station 370 repeats until the neighboring cell list can be received from a cell other than the cell of the pico base station 380 or the relay base station 350.
- the relay base station 350 selects a DeNB connected to the relay base station 350.
- the base station 340 is selected.
- the relay base station 350 requests the base station 340 to transmit a neighbor cell list via the Un link.
- the radio base station 330 transmits the neighboring cell list to the relay base station 350.
- the third embodiment has been described above by taking the pico base station and the relay base station as examples.
- the configuration and operation of the third embodiment can be applied to, for example, the base station 330 and the base station 340, which are not pico base stations or relay base stations.
- the base station 330 can receive a neighbor cell list from the base station 340 and use the received neighbor cell list as a neighbor cell list of a cell managed by the own station.
- the configuration and operation according to the third embodiment can be applied to a femto base station having a smaller coverage than a pico base station or a relay base station.
- the base station according to the third embodiment uses the list of adjacent base stations as the adjacent cell list of the cells managed by the base station, as in the second embodiment. Further, the neighbor cell list stores an identifier (CN-ID) for identifying the core network to which each cell belongs.
- CN-ID identifier
- the time required for the handover procedure becomes longer than the handover between the same core networks. Therefore, according to the third embodiment, since cells belonging to the same core network can be preferentially left in the neighboring cell list, the time required for the handover procedure of the mobile terminal can be shortened.
- the base station, pico base station, and relay base station can realize the functions that the base station, the pico base station, and the relay base station have by hardware, or by a computer and a program executed on the computer.
- the program is provided by being recorded on a recording medium such as a magnetic disk or a semiconductor memory, and read by the computer when the computer is started up. In this way, the operation of the computer is controlled, and the computer is caused to function as the base station, pico base station, and relay base station in each of the above-described embodiments, and the above-described processing is performed.
- a base station Storage means for storing a list in which cells adjacent to a cell managed by the base station are associated with an identifier for identifying a core network to which the adjacent cell belongs; Receiving means for receiving a list stored in the adjacent base station from a base station adjacent to the base station; Control means for using the received list as a list of cells managed by the base station;
- a base station comprising:
- the control means includes The base station according to appendix 1, wherein the received list is optimized and used as a list of cells managed by the base station.
- the control means includes 3. The base station according to appendix 1 or 2, wherein cells in the list that have not been handed over during a predetermined period are deleted from the list and the list is optimized.
- the control means includes The base station according to any one of appendices 1 to 3, wherein cells in the list are deleted from the list based on reception quality of the cells in the list during a predetermined period.
- the control means includes The base station according to appendix 4, wherein cells having the reception quality of a certain order or less are deleted from the cells in the list.
- the control means further includes Any one of Supplementary Note 1 to Supplementary Note 5, wherein a cell belonging to a different core network from a cell managed by the base station is deleted from the list with reference to the identifier. Base station described in.
- the control means further includes Referring to the identifier, optimization is performed so that cells belonging to the same core network as the cell managed by the base station are preferentially left in the list among the cells of the list.
- the base station according to any one of 1 to appendix 6.
- the control means further includes Referring to the identifier, optimization is performed so as to increase the priority in the list of cells belonging to the same core network as the cell managed by the base station among the cells of the list.
- the base station according to any one of appendix 1 to appendix 7.
- the control means includes Any one of appendices 1 to 8, wherein the list is optimized by deleting a cell managed by a base station that is a transmission source of the received list and a cell managed by the own base station. The listed base station.
- the base station further includes: The base station according to any one of appendices 1 to 9, further comprising selection means for selecting a base station that receives the list.
- Appendix 11 The base station according to appendix 10, wherein the selecting means selects a base station that receives the list based on the number of handovers of a cell managed by the adjacent base station.
- Appendix 12 The base station according to appendix 10 or 11, wherein the selecting means selects a base station that receives the list based on a handover success rate of a cell managed by the adjacent base station.
- a communication system comprising a plurality of base stations, The base station Storage means for storing a list in which cells adjacent to a cell managed by the base station are associated with an identifier for identifying a core network to which the adjacent cell belongs; Receiving means for receiving a list stored in the adjacent base station from a base station adjacent to the base station; Control means for using the received list as a list of cells managed by the base station;
- a communication system comprising:
- the control means includes 15. The communication system according to appendix 14, wherein the received list is optimized and used as a list of cells managed by the base station.
- the control means includes The communication system according to appendix 14 or 15, wherein a cell that has not been handed over during a predetermined period is deleted from the list to optimize the list.
- the control means includes The communication system according to any one of appendices 14 to 17, wherein cells in the list are deleted from the list based on reception quality of the cells in the list during a predetermined period.
- the control means includes 18.
- the control means further includes Any one of appendix 14 to appendix 18, wherein a cell belonging to a core network different from a cell managed by the base station is deleted from the list with reference to the identifier.
- the communication system according to 1.
- the control means further includes Referring to the identifier, optimization is performed so that cells belonging to the same core network as the cell managed by the base station are preferentially left in the list among the cells of the list.
- the communication system according to any one of 14 to appendix 19.
- the control means further includes Referring to the identifier, optimization is performed so as to increase the priority in the list of cells belonging to the same core network as the cell managed by the base station among the cells of the list.
- the communication system according to any one of appendix 14 to appendix 20.
- the control means includes Any one of Supplementary notes 14 to 21, wherein the list is optimized by deleting a cell managed by a base station that is a transmission source of the received list and a cell managed by the own base station.
- the base station further includes: The communication system according to any one of appendices 14 to 22, further comprising selection means for selecting a base station that receives the list.
- (Appendix 24) 24 The communication system according to appendix 23, wherein the selection unit selects a base station that receives the list based on the number of handovers of a cell managed by the adjacent base station.
- Appendix 25 The communication system according to appendix 23 or 24, wherein the selecting means selects a base station that receives the list based on a handover success rate of a cell managed by the adjacent base station.
- Appendix 26 The communication according to any one of appendices 23 to 25, wherein the selection means selects a base station that receives the list based on a handover failure rate of a cell managed by the adjacent base station. system.
- Appendix 28 The communication method according to appendix 27, wherein the received list is optimized and used as a list of cells managed by the base station.
- Appendix 30 30.
- Appendix 35 Any one of appendixes 27 to 34, wherein the list is optimized by deleting a cell managed by a base station that is a source of the received list and a cell managed by the own base station. The communication method described.
- Appendix 36 The communication method according to any one of appendices 27 to 35, wherein a base station that receives the list is selected.
- Appendix 37 37.
- Appendix 38 38.
- Appendix 39 The communication method according to any one of appendices 36 to 38, wherein a base station that receives the list is selected based on a handover failure rate of a cell managed by the adjacent base station.
- Appendix 40 A process of receiving a list associated with an identifier identifying a core network to which the adjacent cell belongs, a cell adjacent to a cell managed by the adjacent base station and stored in an adjacent base station; A process of using the received list as a list of cells managed by the base station; A program that causes a computer to execute.
- appendix 41 41.
- the program according to appendix 40 further comprising a process of optimizing the received list and using it as a list of cells managed by the base station.
- Appendix 42 42.
- Appendix 44 44.
- the program according to appendix 43 including a process of deleting a cell having a reception quality of a certain order or less among the cells in the list.
- Appendix 45 Any one of appendix 40 to appendix 44, comprising: referring to the identifier, and deleting, from the list, cells belonging to a different core network from the cells managed by the base station among the cells of the list A program according to any one of the above.
- Appendix 48 Any one of appendices 40 to 47, including a process of deleting the cell managed by the base station that is the sending source of the received list and the cell managed by the own base station and optimizing the list The program according to one.
- Appendix 49 49.
- Appendix 50 The program according to appendix 49, further comprising: a process of selecting a base station that receives the list based on the number of cell handovers managed by the adjacent base station.
- Appendix 51 51.
- Appendix 52 52.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
[構成]
図1は、本発明の第1の実施形態による基地局1000の構成例を示した図である。図1によれば、基地局1000は、記憶手段1001と、受信手段1002と、制御手段1003と、を含む。また、基地局1000は、セルを管理している。
図3は、第1の実施形態による動作の流れを示すフローチャートである。
上記の通り、第1の実施形態による基地局1000は、隣接する基地局のリストを、基地局1000が管理するセルのリストとして用いている。また、リストは、各セルが属するコアネットワークを識別する識別子を記憶している。
[システムの構成]
図4は、第2の実施形態による通信システムの構成例を示した図である。図4によれば、第2の実施形態による通信システムは、MME(Mobility Management Entity)310、S-GW(Saving-Gateway)320、基地局330、基地局340を含む。通信システムは、さらに、中継基地局350、移動端末361、移動端末362、移動端末363を含む。
次に、図5を用いて基地局の構成について説明する。図5は、ピコ基地局370の構成例を示している。なお、図5の構成は、ピコ基地局370だけではなく、他の基地局である、基地局330、基地局340、あるいは中継基地局350にも同様に適用できる。
以下、第2の実施形態による動作について、図7を参照し、ピコ基地局370を例にとって説明する。図7は、ピコ基地局370の動作を示したフローチャートである。
以下、受信した隣接セルリストの最適化について、図8のフローチャートを参照して説明する。
中にハンドオーバが発生しているかどうかを判定する(S202)。所定期間中に、セル
Aに対してハンドオーバが発生している場合には、セルAに対しての処理は終了する。
次に、基地局間での隣接セルリストの送受信方法について説明する。以下に説明する動作は、図7のフローチャートでいえば、S101とS102に相当する。
上記の通り、第2の実施形態による基地局は、隣接する基地局のリストを、基地局が管理するセルの隣接セルリストとして用いている。また、隣接セルリストは、各セルが属するコアネットワークを識別する識別子(CN-ID)を記憶している。
続いて、第3の実施形態について説明する。第3の実施形態では、図7のフローチャートにおけるS101、隣接セルリストを受信する基地局の選択方法について説明する。第3の実施形態は、第1の実施形態および第2の実施形態と適宜組み合わせて適用されてもよい。なお、各基地局の構成は、第2の実施形態と同様であるので、説明は省略する。
図11は、基地局330、基地局340、中継基地局350、ピコ基地局370、ピコ基地局380のセルと、移動端末361、移動端末362との関係を示した図である。なお、簡単のために、MME301、S-GW302の記載は省略された。。また、各基地局は複数のセルを有しても良いが、図11の例では、各基地局はそれぞれ1つのセルを有しているとする。
以降、ピコ基地局370が管理するセルの隣接セルリストを受信するまでの動作について、具体的に説明する。なお、ピコ基地局380も同様の動作をするため、その説明は省略する。
次に、中継基地局350の隣接セルリストを受信するまでの動作について、具体的に説明する。
上記の通り、第3の実施形態による基地局は、第2の実施形態と同様に、隣接する基地局のリストを、基地局が管理するセルの隣接セルリストとして用いている。また、隣接セルリストは、各セルが属するコアネットワークを識別する識別子(CN-ID)を記憶している。
基地局であって、
前記基地局が管理するセルに隣接するセルを、前記隣接するセルが属するコアネットワークを識別する識別子と対応付けたリストを記憶する記憶手段と、
前記基地局に隣接する基地局から、前記隣接する基地局が記憶するリストを受信する受信手段と、
前記受信したリストを自基地局が管理するセルのリストとして用いる制御手段と、
を備えることを特徴とする基地局。
前記制御手段は、
前記受信したリストを最適化して前記自基地局が管理するセルのリストとして用いる ことを特徴とする付記1に記載の基地局。
前記制御手段は、
前記リスト内のセルのうち、所定期間中にハンドオーバが実行されていないセルを前記リストから削除して前記リストの最適化を行う ことを特徴とする付記1または2に記載の基地局。
前記制御手段は、
前記リスト内のセルの所定期間中における受信品質に基づいて、前記リスト内のセルをリストから削除する
ことを特徴とする付記1から3のいずれか1つに記載の基地局。
前記制御手段は、
前記リスト内のセルのうち、前記受信品質が一定順位以下のセルを削除する
ことを特徴とする付記4に記載の基地局。
前記制御手段は、さらに、
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと異なるコアネットワークに属するセルを前記リストから削除する
ことを特徴とする付記1から付記5のいずれか1つに記載の基地局。
前記制御手段は、さらに、
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルを前記リストに優先的に残すように最適化を行う
ことを特徴とする付記1から付記6のいずれか1つに記載の基地局。
前記制御手段は、さらに、
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルの前記リスト内での優先度を上げるように最適化を行う
ことを特徴とする付記1から付記7のいずれか1つに記載の基地局。
前記制御手段は、
前記受信したリストの送付元の基地局が管理するセルと、自基地局が管理するセルとを削除して前記リストの最適化を行う
ことを特徴とする付記1から8のいずれか1つに記載の基地局。
前記基地局は、さらに、
前記リストを受信する基地局を選択する選択手段を備える
ことを特徴とする付記1から9のいずれか1つに記載の基地局。
前記選択手段は、前記隣接する基地局が管理するセルのハンドオーバ回数に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記10に記載の基地局。
前記選択手段は、前記隣接する基地局が管理するセルのハンドオーバ成功率に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記10または11に記載の基地局。
前記選択手段は、前記隣接する基地局が管理するセルのハンドオーバ失敗率に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記10から12のいずれか1つに記載の基地局。
複数の基地局を備える通信システムであって、
前記基地局は、
前記基地局が管理するセルに隣接するセルを、前記隣接するセルが属するコアネットワークを識別する識別子と対応付けたリストを記憶する記憶手段と、
前記基地局に隣接する基地局から、前記隣接する基地局が記憶するリストを受信する受信手段と、
前記受信したリストを自基地局が管理するセルのリストとして用いる制御手段と、
を備えることを特徴とする通信システム。
前記制御手段は、
前記受信したリストを最適化して前記自基地局が管理するセルのリストとして用いる
ことを特徴とする付記14に記載の通信システム。
前記制御手段は、
前記リスト内のセルのうち、所定期間中にハンドオーバが実行されていないセルを前記リストから削除して前記リストの最適化を行う
ことを特徴とする付記14または15に記載の通信システム。
前記制御手段は、
前記リスト内のセルの所定期間中における受信品質に基づいて、前記リスト内のセルをリストから削除する
ことを特徴とする付記14から17のいずれか1つに記載の通信システム。
前記制御手段は、
前記リスト内のセルのうち、前記受信品質が一定順位以下のセルを削除する
ことを特徴とする付記17に記載の通信システム。
前記制御手段は、さらに、
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと異なるコアネットワークに属するセルを前記リストから削除する
ことを特徴とする付記14から付記18のいずれか1つに記載の通信システム。
前記制御手段は、さらに、
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルを前記リストに優先的に残すように最適化を行う
ことを特徴とする付記14から付記19のいずれか1つに記載の通信システム。
前記制御手段は、さらに、
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルの前記リスト内での優先度を上げるように最適化を行う ことを特徴とする付記14から付記20のいずれか1つに記載の通信システム。
前記制御手段は、
前記受信したリストの送付元の基地局が管理するセルと、自基地局が管理するセルとを削除して前記リストの最適化を行う
ことを特徴とする付記14から21のいずれか1つに記載の通信システム。
前記基地局は、さらに、
前記リストを受信する基地局を選択する選択手段を備える
ことを特徴とする付記14から22のいずれか1つに記載の通信システム。
前記選択手段は、前記隣接する基地局が管理するセルのハンドオーバ回数に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記23に記載の通信システム。
前記選択手段は、前記隣接する基地局が管理するセルのハンドオーバ成功率に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記23または24に記載の通信システム。
前記選択手段は、前記隣接する基地局が管理するセルのハンドオーバ失敗率に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記23から25のいずれか1つに記載の通信システム。
隣接する基地局が記憶する、前記隣接する基地局が管理するセルに隣接するセルを、前記隣接するセルが属するコアネットワークを識別する識別子と対応付けたリストを受信し、
前記受信したリストを自基地局が管理するセルのリストとして用いる、
ことを特徴とする通信方法。
前記受信したリストを最適化して前記自基地局が管理するセルのリストとして用いる
ことを特徴とする付記27に記載の通信方法。
前記リスト内のセルのうち、所定期間中にハンドオーバが実行されていないセルを前記リストから削除して前記リストの最適化を行う
ことを特徴とする付記27または28に記載の通信方法。
前記リスト内のセルの所定期間中における受信品質に基づいて、前記リスト内のセルをリストから削除する
ことを特徴とする付記27から29のいずれか1つに記載の通信方法。
前記リスト内のセルのうち、前記受信品質が一定順位以下のセルを削除する
ことを特徴とする付記30に記載の通信方法。
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと異なるコアネットワークに属するセルを前記リストから削除する
ことを特徴とする付記27から付記31のいずれか1つに記載の通信方法。
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルを前記リストに優先的に残すように最適化を行う
ことを特徴とする付記27から付記32のいずれか1つに記載の通信方法。
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルの前記リスト内での優先度を上げるように最適化を行う
ことを特徴とする付記27から付記33のいずれか1つに記載の通信方法。
前記受信したリストの送付元の基地局が管理するセルと、自基地局が管理するセルとを削除して前記リストの最適化を行う
ことを特徴とする付記27から34のいずれか1つに記載の通信方法。
前記リストを受信する基地局を選択する
ことを特徴とする付記27から35のいずれか1つに記載の通信方法。
前記隣接する基地局が管理するセルのハンドオーバ回数に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記36に記載の通信方法。
前記隣接する基地局が管理するセルのハンドオーバ成功率に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記36または37に記載の通信方法。
前記隣接する基地局が管理するセルのハンドオーバ失敗率に基づいて、前記リストを受信する基地局を選択する
ことを特徴とする付記36から38のいずれか1つに記載の通信方法。
隣接する基地局が記憶する、前記隣接する基地局が管理するセルに隣接するセルを、前記隣接するセルが属するコアネットワークを識別する識別子と対応付けたリストを受信する処理と、
前記受信したリストを自基地局が管理するセルのリストとして用いる処理と、
をコンピュータに実行させることを特徴とするプログラム。
前記受信したリストを最適化して前記自基地局が管理するセルのリストとして用いる処理
を含むことを特徴とする付記40に記載のプログラム。
前記リスト内のセルのうち、所定期間中にハンドオーバが実行されていないセルを前記リストから削除して前記リストの最適化を行う処理
を含むことを特徴とする付記40または41に記載のプログラム。
前記リスト内のセルの所定期間中における受信品質に基づいて、前記リスト内のセルをリストから削除する処理
を含むことを特徴とする付記40から42のいずれか1つに記載のプログラム。
前記リスト内のセルのうち、前記受信品質が一定順位以下のセルを削除する処理
を含むことを特徴とする付記43に記載のプログラム。
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと異なるコアネットワークに属するセルを前記リストから削除する処理
を含むことを特徴とする付記40から付記44のいずれか1つに記載のプログラム。
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルを前記リストに優先的に残すように最適化を行う処理 を含むことを特徴とする付記40から付記45のいずれか1つに記載のプログラム。
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルの前記リスト内での優先度を上げるように最適化を行う処理
を含むことを特徴とする付記40から付記46のいずれか1つに記載のプログラム。
前記受信したリストの送付元の基地局が管理するセルと、自基地局が管理するセルとを削除して前記リストの最適化を行う処理
を含むことを特徴とする付記40から47のいずれか1つに記載のプログラム。
前記リストを受信する基地局を選択する処理
を含むことを特徴とする付記40から48のいずれか1つに記載のプログラム。
前記隣接する基地局が管理するセルのハンドオーバ回数に基づいて、前記リストを受信する基地局を選択する処理
を含むことを特徴とする付記49に記載のプログラム。
前記隣接する基地局が管理するセルのハンドオーバ成功率に基づいて、前記リストを受信する基地局を選択する処理
を含むことを特徴とする付記49または50に記載のプログラム。
前記隣接する基地局が管理するセルのハンドオーバ失敗率に基づいて、前記リストを受信する基地局を選択する処理
を含むことを特徴とする付記49から51のいずれか1つに記載のプログラム。
302 S-GW
303、304、1000 基地局
305 中継基地局
306 移動端末
307、308 ピコ基地局
1001 リスト
1002 受信手段
1003 制御手段
3071 記憶部
3072 受信部
3073 制御部
3074 選択部
3075 測定部
Claims (10)
- 基地局であって、
前記基地局が管理するセルに隣接するセルを、前記隣接するセルが属するコアネットワークを識別する識別子と対応付けたリストを記憶する記憶手段と、
前記基地局に隣接する基地局から、前記隣接する基地局が記憶するリストを受信する受信手段と、
前記受信したリストを自基地局が管理するセルのリストとして用いる制御手段と、
を備えることを特徴とする基地局。 - 前記制御手段は、
前記受信したリストを最適化して前記自基地局が管理するセルのリストとして用いる
ことを特徴とする請求項1に記載の基地局。 - 前記制御手段は、
前記リスト内のセルのうち、所定期間中にハンドオーバが実行されていないセルを前記リストから削除して前記リストの最適化を行う
ことを特徴とする請求項1または2に記載の基地局。 - 前記制御手段は、
前記リスト内のセルの所定期間中における受信品質に基づいて、前記リスト内のセルをリストから削除する
ことを特徴とする請求項1から3のいずれか1つに記載の基地局。 - 前記制御手段は、
前記リスト内のセルのうち、前記受信品質が一定順位以下のセルを削除する
ことを特徴とする請求項4に記載の基地局。 - 前記制御手段は、さらに、
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと異なるコアネットワークに属するセルを前記リストから削除する
ことを特徴とする請求項1から請求項5のいずれか1つに記載の基地局。 - 前記制御手段は、さらに、
前記識別子を参照して、前記リストのセルのうち、前記自基地局が管理するセルと同一のコアネットワークに属するセルを前記リストに優先的に残すように最適化を行う
ことを特徴とする請求項1から請求項6のいずれか1つに記載の基地局。 - 複数の基地局を備える通信システムであって、
前記基地局は、
前記基地局が管理するセルに隣接するセルを、前記隣接するセルが属するコアネットワークを識別する識別子と対応付けたリストを記憶する記憶手段と、
前記基地局に隣接する基地局から、前記隣接する基地局が記憶するリストを受信する受信手段と、
前記受信したリストを自基地局が管理するセルのリストとして用いる制御手段と、
を備えることを特徴とする通信システム。 - 隣接する基地局が記憶する、前記隣接する基地局が管理するセルに隣接するセルを、前記隣接するセルが属するコアネットワークを識別する識別子と対応付けたリストを受信し、
前記受信したリストを自基地局が管理するセルのリストとして用いる、
ことを特徴とする通信方法。 - 隣接する基地局が記憶する、前記隣接する基地局が管理するセルに隣接するセルを、前記隣接するセルが属するコアネットワークを識別する識別子と対応付けたリストを受信する処理と、
前記受信したリストを自基地局が管理するセルのリストとして用いる処理と、
をコンピュータに実行させるためのプログラムが記録された、プログラムの記録媒体。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013554103A JP5874937B2 (ja) | 2012-01-16 | 2012-12-21 | 基地局、通信システム、通信方法、およびプログラム |
EP12866082.6A EP2806690B1 (en) | 2012-01-16 | 2012-12-21 | Base station, communication system, communication method, and program recording medium |
IN5867DEN2014 IN2014DN05867A (ja) | 2012-01-16 | 2012-12-21 | |
US14/370,308 US20150117403A1 (en) | 2012-01-16 | 2012-12-21 | Base station, communication system, communication method, and program recording medium |
CN201280067234.7A CN104054373A (zh) | 2012-01-16 | 2012-12-21 | 基站、通信系统、通信方法、以及程序记录介质 |
KR1020147019443A KR101624820B1 (ko) | 2012-01-16 | 2012-12-21 | 기지국, 통신 시스템, 통신 방법, 및 프로그램의 기록 매체 |
RU2014133746/07A RU2570350C1 (ru) | 2012-01-16 | 2012-12-21 | Базовая станция, система связи, способ связи и носитель для записи программы |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-006324 | 2012-01-16 | ||
JP2012006324 | 2012-01-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013108346A1 true WO2013108346A1 (ja) | 2013-07-25 |
Family
ID=48798798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/008209 WO2013108346A1 (ja) | 2012-01-16 | 2012-12-21 | 基地局、通信システム、通信方法、およびプログラムの記録媒体 |
Country Status (8)
Country | Link |
---|---|
US (1) | US20150117403A1 (ja) |
EP (1) | EP2806690B1 (ja) |
JP (1) | JP5874937B2 (ja) |
KR (1) | KR101624820B1 (ja) |
CN (1) | CN104054373A (ja) |
IN (1) | IN2014DN05867A (ja) |
RU (1) | RU2570350C1 (ja) |
WO (1) | WO2013108346A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015141187A1 (ja) * | 2014-03-18 | 2015-09-24 | 日本電気株式会社 | 基地局及び基地局の制御方法 |
JP2016158192A (ja) * | 2015-02-26 | 2016-09-01 | 富士通株式会社 | 端末装置、無線通信システム、及びメッセージ送信方法 |
CN106535135A (zh) * | 2015-09-10 | 2017-03-22 | 大唐移动通信设备有限公司 | 一种集群业务实现方法及装置 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014163553A1 (en) * | 2013-04-05 | 2014-10-09 | Telefonaktiebolaget L M Ericsson (Publ) | Methods of operating radio access network base stations and related network nodes |
JP6281192B2 (ja) * | 2013-05-24 | 2018-02-21 | 富士通株式会社 | 基地局装置、ハンドオーバー制御方法および無線通信システム |
US9319872B1 (en) * | 2014-05-13 | 2016-04-19 | Sprint Spectrum L.P. | Method for allocating coverage area identifiers among nearby base stations |
EP3643112A1 (en) | 2017-06-23 | 2020-04-29 | Blackned GmbH | Network access entity for dynamically reconfigurable networks |
AU2017438694B2 (en) * | 2017-11-13 | 2023-07-27 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for determining core network type during handover process, terminal device, access network device, and core network device |
KR102398494B1 (ko) * | 2017-11-21 | 2022-05-17 | 한국전자통신연구원 | 기지국의 주변 셀 목록 관리 방법 및 주변 셀 목록 관리 장치 |
CN113727402A (zh) * | 2021-09-28 | 2021-11-30 | 维沃移动通信有限公司 | 异常小区处理方法及装置 |
EP4167635A1 (en) * | 2021-10-15 | 2023-04-19 | Volkswagen Ag | Method for user equipment for improving a handover list, method for a cell, apparatus, vehicle and computer program |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006101426A1 (en) * | 2005-03-23 | 2006-09-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system of radio communication |
JP2008153963A (ja) | 2006-12-18 | 2008-07-03 | Nec Corp | 隣接セルリストの設定方法、端末、サーバー及び移動体通信ネットワーク |
JP2008177787A (ja) * | 2007-01-17 | 2008-07-31 | Ntt Docomo Inc | 論理インタフェース設定方法、無線基地局、通信管理装置 |
JP2009272884A (ja) * | 2008-05-07 | 2009-11-19 | Fujitsu Ltd | 基地局装置、近隣セル情報管理プログラムおよび近隣セル情報管理方法 |
WO2010078270A2 (en) * | 2008-12-30 | 2010-07-08 | Qualcomm Incorporated | Interface authorization scheme |
JP2011004101A (ja) | 2009-06-18 | 2011-01-06 | Fujitsu Ltd | 無線通信システム、基地局装置、端末装置、及び無線通信システムにおける通信リンク設定方法 |
WO2011061990A1 (ja) * | 2009-11-19 | 2011-05-26 | 日本電気株式会社 | 無線通信システム、隣接セルリスト最適化システム、基地局および隣接セルリスト更新方法 |
JP2012010305A (ja) * | 2010-05-28 | 2012-01-12 | Sumitomo Electric Ind Ltd | 隣接セル処理装置および隣接セル処理方法 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4751759B2 (ja) * | 2006-04-21 | 2011-08-17 | 株式会社エヌ・ティ・ティ・ドコモ | 基地局及び通信方法 |
WO2008039124A1 (en) * | 2006-09-25 | 2008-04-03 | Telefonaktiebolaget Lm Ericsson (Publ) | A method, a serving cell controller and a system for detecting support for packet-switched handover |
US8620320B2 (en) * | 2007-06-19 | 2013-12-31 | Motorola Mobility Llc | Methods for handing over calls between communication networks using dissimilar air interfaces |
US8831606B2 (en) * | 2007-07-18 | 2014-09-09 | Zte Corporation | Mobile terminal registration method in a radio network |
ATE546972T1 (de) * | 2009-02-25 | 2012-03-15 | Alcatel Lucent | Verfahren und gerät zur dynamischen aktualisierung von nachbarzelllisten in heterogenen netzwerken |
CN102026313B (zh) * | 2010-06-21 | 2012-03-21 | 华为技术有限公司 | 切换处理方法和设备 |
EP2604069B1 (en) * | 2010-08-10 | 2018-10-10 | Beijing Xiaomi Mobile Software Co., Ltd. | Relay enhanced cellular telecommunication network |
CN102378273B (zh) * | 2010-08-10 | 2016-03-30 | 中兴通讯股份有限公司 | 获取邻接基站/中继节点接口信息的方法及无线中继系统 |
US9055492B2 (en) * | 2010-11-03 | 2015-06-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and a network node for sharing information over an interface in a telecommunications system |
CN102301788B (zh) * | 2011-04-11 | 2013-09-11 | 华为技术有限公司 | X2链路建立方法和装置 |
WO2013044986A1 (en) * | 2011-09-30 | 2013-04-04 | Telefonaktiebolaget L M Ericsson (Publ) | A method and apparatus for enabling assignment of a gateway to an access node |
-
2012
- 2012-12-21 CN CN201280067234.7A patent/CN104054373A/zh active Pending
- 2012-12-21 IN IN5867DEN2014 patent/IN2014DN05867A/en unknown
- 2012-12-21 JP JP2013554103A patent/JP5874937B2/ja active Active
- 2012-12-21 EP EP12866082.6A patent/EP2806690B1/en active Active
- 2012-12-21 RU RU2014133746/07A patent/RU2570350C1/ru not_active IP Right Cessation
- 2012-12-21 US US14/370,308 patent/US20150117403A1/en not_active Abandoned
- 2012-12-21 KR KR1020147019443A patent/KR101624820B1/ko not_active IP Right Cessation
- 2012-12-21 WO PCT/JP2012/008209 patent/WO2013108346A1/ja active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006101426A1 (en) * | 2005-03-23 | 2006-09-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system of radio communication |
JP2008153963A (ja) | 2006-12-18 | 2008-07-03 | Nec Corp | 隣接セルリストの設定方法、端末、サーバー及び移動体通信ネットワーク |
JP2008177787A (ja) * | 2007-01-17 | 2008-07-31 | Ntt Docomo Inc | 論理インタフェース設定方法、無線基地局、通信管理装置 |
JP2009272884A (ja) * | 2008-05-07 | 2009-11-19 | Fujitsu Ltd | 基地局装置、近隣セル情報管理プログラムおよび近隣セル情報管理方法 |
WO2010078270A2 (en) * | 2008-12-30 | 2010-07-08 | Qualcomm Incorporated | Interface authorization scheme |
JP2011004101A (ja) | 2009-06-18 | 2011-01-06 | Fujitsu Ltd | 無線通信システム、基地局装置、端末装置、及び無線通信システムにおける通信リンク設定方法 |
WO2011061990A1 (ja) * | 2009-11-19 | 2011-05-26 | 日本電気株式会社 | 無線通信システム、隣接セルリスト最適化システム、基地局および隣接セルリスト更新方法 |
JP2012010305A (ja) * | 2010-05-28 | 2012-01-12 | Sumitomo Electric Ind Ltd | 隣接セル処理装置および隣接セル処理方法 |
Non-Patent Citations (3)
Title |
---|
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access Network (E-UTRAN);X2 application protocol (X2AP) (Release 10)", 3GPP TS 36.423 V10.4.0, December 2011 (2011-12-01), pages 20 - 24, 35-39, XP050554670 * |
"Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 application protocol (X2AP", 3GPP TS36.423 (V10.3.0, September 2011 (2011-09-01) |
See also references of EP2806690A4 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015141187A1 (ja) * | 2014-03-18 | 2015-09-24 | 日本電気株式会社 | 基地局及び基地局の制御方法 |
JPWO2015141187A1 (ja) * | 2014-03-18 | 2017-04-06 | 日本電気株式会社 | 基地局及び基地局の制御方法 |
JP2016158192A (ja) * | 2015-02-26 | 2016-09-01 | 富士通株式会社 | 端末装置、無線通信システム、及びメッセージ送信方法 |
CN106535135A (zh) * | 2015-09-10 | 2017-03-22 | 大唐移动通信设备有限公司 | 一种集群业务实现方法及装置 |
Also Published As
Publication number | Publication date |
---|---|
US20150117403A1 (en) | 2015-04-30 |
EP2806690A1 (en) | 2014-11-26 |
IN2014DN05867A (ja) | 2015-06-26 |
EP2806690B1 (en) | 2019-03-27 |
CN104054373A (zh) | 2014-09-17 |
JPWO2013108346A1 (ja) | 2015-05-11 |
EP2806690A4 (en) | 2015-12-02 |
KR20140103330A (ko) | 2014-08-26 |
JP5874937B2 (ja) | 2016-03-02 |
RU2570350C1 (ru) | 2015-12-10 |
KR101624820B1 (ko) | 2016-05-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5874937B2 (ja) | 基地局、通信システム、通信方法、およびプログラム | |
JP5987838B2 (ja) | 移動通信システム、中継局、基地局、及びこれらの制御方法 | |
JP5922145B2 (ja) | 通信システム、無線通信ノード、及び通信制御方法 | |
US9439108B2 (en) | Management method, management node, communication system, and recording medium for program | |
JP5631804B2 (ja) | 基地局及びその制御方法 | |
JP6467543B2 (ja) | 通信システム、ユーザ端末、プロセッサ及び通信制御方法 | |
WO2012017582A1 (ja) | 中継局装置、移動通信システム、基地局装置、及び中継局の制御方法 | |
US20160198517A1 (en) | Connection Management Method and Access Network Element | |
JP2012231343A (ja) | 基地局及びその制御方法 | |
JP2015146541A (ja) | 移動無線装置、移動通信システム、及びセル選択制御プログラム | |
JP2012231342A (ja) | 基地局及びその制御方法 | |
US9681344B1 (en) | Differential handling of buffered data during handover based on whether handover target is a relay with wireless backhaul | |
JP5673853B2 (ja) | 基地局、通信システム、通信方法、および記憶媒体 | |
JP5749414B1 (ja) | 基地局及びその制御方法 | |
JP5714167B2 (ja) | 基地局及びその制御方法 | |
JP2012231341A (ja) | 基地局及びその制御方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12866082 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14370308 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012866082 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2013554103 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20147019443 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2014133746 Country of ref document: RU Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |