WO2012032886A1 - 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 - Google Patents
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 Download PDFInfo
- Publication number
- WO2012032886A1 WO2012032886A1 PCT/JP2011/067766 JP2011067766W WO2012032886A1 WO 2012032886 A1 WO2012032886 A1 WO 2012032886A1 JP 2011067766 W JP2011067766 W JP 2011067766W WO 2012032886 A1 WO2012032886 A1 WO 2012032886A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cell
- mobile terminal
- cell list
- new
- neighboring
- Prior art date
Links
- 238000004891 communication Methods 0.000 title claims abstract description 45
- 238000005457 optimization Methods 0.000 title claims description 86
- 238000000034 method Methods 0.000 title claims description 59
- 238000001514 detection method Methods 0.000 claims abstract description 67
- 238000005259 measurement Methods 0.000 claims description 110
- 238000003860 storage Methods 0.000 description 20
- 230000008569 process Effects 0.000 description 10
- 238000010295 mobile communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000284 extract Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001960 triggered effect Effects 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
- H04W88/02—Terminal devices
-
- 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
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- 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
- H04W36/0085—Hand-off measurements
-
- 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
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
Definitions
- the present invention relates to a wireless communication system for updating a neighboring cell list, a neighboring cell list optimization system, a base station, and a neighboring cell list updating method.
- a wireless communication system includes a mobile terminal 10, a wireless base station 30, a mobile communication core network 50, and a network management system 90.
- the radio base station 30 is provided with a radio cell 35 in a range where the radio link 20 with the mobile terminal 10 is effective around the own station, and manages the radio cell 35.
- the mobile terminal 10 connects to the radio cell 35 managed by the radio base station 30 and transmits / receives data such as communication traffic and control traffic to / from the radio base station 30.
- the radio base station 30 transmits and receives data to and from the mobile communication core network 50 connected via the wired link 40.
- the mobile communication core network 50 includes a switching center and a server device (not shown), and is connected to the radio base station 30 via the wired link 40 and connected to the external network 70 via the wired link 60. 30 and the external network 70.
- the network management system 90 is connected to the radio base station 30 via the wired link 80 and is connected to the mobile communication core network 50 via the wired link 81 to monitor the quality, failure monitoring, and configuration management of the radio communication system. And so on.
- radio parameters include total transmission power for each radio cell, inclination angle of the radio base station antenna in the vertical / horizontal plane, adjacent cell list, handover threshold, and the like.
- the wireless base station 30 sets a neighboring cell list of wireless cells managed by itself as a wireless parameter, and this neighboring cell list will be described.
- a wireless communication system services are provided by arranging wireless cells across the entire service area.
- the mobile terminal 10 moves from a connection-destination radio cell to another radio cell, the mobile terminal 10 performs a process called handover to switch the connection-destination radio cell.
- This process is realized as follows. First, for the mobile terminal 10, the radio quality of a connection destination radio cell and a radio cell adjacent thereto (adjacent cell) is measured, and when the radio quality of the connection destination radio cell deteriorates, the radio quality of the adjacent cell is measured. Instruct in advance to report the information to the radio base station 30 that manages the connected radio cell. The radio base station 30 determines a handover destination radio cell at the time when there is a report from the mobile terminal 10.
- the neighboring cell list indicates the wireless cells that are candidates for the handover destination of the mobile terminal 10.
- the adjacent cell list is generated for each radio cell by the communication carrier, and is notified to the mobile terminal 10 from the radio base station 30 that manages the radio cell via the downlink.
- the mobile terminal 10 may measure only the radio quality of the radio cell registered in the neighbor cell list among the neighbor cells and report it to the radio base station 30.
- a radio cell registered in the neighboring cell list is referred to as a “Listed Cell”, and a radio cell not registered in the neighboring cell list is referred to as a “Detected Cell”.
- Non-Patent Document 1 the mathematical expression (1) described in Non-Patent Document 1 is used as an operating condition for the mobile terminal 10 to perform the reporting operation of the wireless quality measurement information.
- the mobile terminal 10 measures the reception power of the pilot signal transmitted from the radio base station 30 that manages the radio cell as the radio quality of the radio cell.
- P s is the received power at the mobile terminal 10 of the pilot signal transmitted from the radio base station 30 that manages the connection-destination radio cell.
- P t is the received power at the mobile terminal 10 of the pilot signal transmitted from the radio base station (adjacent base station) 30 that manages the adjacent cell.
- O s and O t are both offset values of the received power, O s acts on the received power of the pilot signal transmitted from the radio base station 30 that manages the connection-destination radio cell, and O t is the adjacent base station. This affects the received power of the pilot signal transmitted from the station 30.
- O t can be set to a different value for each adjacent cell.
- the radio base station 30 When the operating condition of Equation (1) is set, the radio base station 30 notifies the operating condition of Equation (1) to the mobile terminal 10 connected to the radio cell managed by the own station.
- the mobile terminal 10 transmits a pilot transmitted from a radio base station 30 that manages a connection-destination radio cell and an adjacent base station 30 that manages a Listed Cell registered in the adjacent cell list among the adjacent base stations 30.
- the radio base station 30 uses the received power of the pilot signal transmitted from the adjacent base station 30 managing the listed cell as radio quality measurement information. To report to.
- Equation (1) is hereinafter referred to as a trigger condition.
- a determination threshold of handover parameters Th HO handover threshold
- the mobile terminal 10 reports the radio quality measurement information of the listed cell to the radio base station 30 when the radio quality measurement information of the connection destination radio cell and the listed cell satisfies the above operating conditions.
- the radio base station 30 normally determines a handover destination radio cell from among the listed cells received from the mobile terminal 10. Therefore, normally, the mobile terminal 10 cannot perform handover to a detected cell that is not registered in the neighboring cell list.
- the upper limit (L Max ) Is provided. Therefore, it is necessary to preferentially register such a radio cell in the neighbor cell list so that a radio cell that is highly likely to contribute to the improvement of radio quality is registered in the neighbor cell list.
- the setting of the neighboring cell list requires a high level of technology, and usually the neighboring cell list is updated (optimized) based on the result of a running test in the service area of the wireless communication system. .
- a neighboring cell list optimization system that autonomously updates a neighboring cell list during operation of a wireless communication system has been studied.
- FIG. 2 is a diagram illustrating an example of a configuration of a wireless communication system including the neighboring cell list optimization system.
- the radio communication system shown in FIG. 2 includes a mobile terminal 10, a radio base station 30, a mobile communication core network 50, a network management system 90, and an adjacent cell list optimization system 95.
- a mobile terminal 10 includes a mobile terminal 10
- a radio base station 30 includes a mobile communication core network 50
- a network management system 90 includes a network management system 90
- an adjacent cell list optimization system 95 includes a mobile terminal 10.
- FIG. 2 the same components as those in FIG.
- the neighboring cell list optimization system 95 is connected to the network management system 90 via the wired link 82 and updates the neighboring cell list of the wireless cell 35 set in the wireless base station 30.
- Non-Patent Document 2 describes a method of updating a neighboring cell list by a neighboring cell list optimization system.
- FIG. 3 is a diagram for explaining a neighbor cell list update method described in Non-Patent Document 2.
- the mobile terminal measures the received power of the pilot signal transmitted from the radio base station that manages the radio cell as the radio quality of the radio cell. Also, the mobile terminal measures both Listed Cell and Detected Cell as neighboring cells, and when the received power of the pilot signal transmitted from the radio base station that manages the neighboring cells is equal to or higher than the threshold, the received power To the radio base station as measurement information of the radio quality of the neighboring cell.
- the number of handover attempts (a) to the listed cell is counted for each listed cell registered in the neighbor cell list.
- the number of reports (n) that is the number of reports received from the mobile terminal is counted up when the reception power of the pilot signal transmitted from the radio base station that manages the detected cell is equal to or greater than the threshold. .
- the Listed Cell in which the number of handover attempts (a) is less than or equal to the threshold (Th Del ) is deleted from the neighbor cell list, and the detected cell in which the number of reports (n) is greater than or equal to the threshold (Th Add ) (N) is registered in the neighbor cell list in order from the radio cell with the largest. Thereby, the adjacent cell list is updated.
- Non-Patent Document 2 has the following problems.
- a new radio cell is adjacent due to a change in the geographical range of the radio cell due to the construction or removal of a building, the establishment of a radio base station, or the restart operation of a radio base station that has been temporarily stopped. It may appear in the middle as a cell.
- the number of reports (n) from the mobile terminal and the number of handover attempts (a) are greater in the new cell than in the existing radio cell (existing cell). Less is. Therefore, there is a problem that it is difficult to quickly add a new cell to the adjacent cell list.
- the threshold value (Th Add ) described in Non-Patent Document 2 is lowered to create a new cell. It is possible to make it easier to add. However, in this case, since there is an upper limit on the number of radio cells that can be registered in the neighbor cell list, there is no room for registering a new cell, so it is difficult to add a new cell.
- the number of reports (n) and the number of handover attempts (a) in the existing cell are set so that the total value of the number of reports (n) and the number of handover attempts (a) does not open extremely between the existing cell and the new cell. It is conceivable to shorten the aggregation period. However, in this case, the reliability of the aggregate value decreases due to the lack of the number of samples, and the reliability of the neighboring cell list decreases, such as deleting important existing cells or adding unnecessary existing cells. Will cause another problem.
- an object of the present invention is to provide a wireless communication system, a neighboring cell list optimization system, a base station, and a neighboring cell list optimization method that solve the above-described problems.
- the wireless communication system of the present invention includes: A wireless communication system comprising a mobile terminal and a base station that manages a cell to which the mobile terminal is connected, A new cell detection unit that detects a new cell that is newly started, restarted, or changed in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected; A neighbor cell list generation unit that preferentially registers a new cell detected by the new cell detection unit in a neighbor cell list in which neighbor cells that are candidates for a handover destination of the mobile terminal are registered;
- the neighboring cell list optimization system of the present invention includes: A neighbor cell list optimization system that updates a neighbor cell list in which neighbor cells that are candidates for a handover destination of a mobile terminal connected to a cell managed by a base station are registered, A new cell detection unit that detects a new cell that is newly started, restarted, or expanded in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected; A neighboring cell list generation unit that preferentially registers a new cell detected by the new cell detection unit in the neighboring cell list;
- the base station of the present invention A base station that manages a cell to which a mobile terminal is connected, A new cell detection unit that detects a new cell that is newly started, restarted, or expanded in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected; A neighbor cell list generation unit that preferentially registers a new cell detected by the new cell detection unit in a neighbor cell list in which neighbor cells that are candidates for a handover destination of the mobile terminal are registered;
- the first neighboring cell list update method of the present invention includes: A neighbor cell list update method by a neighbor cell list optimization system that updates a neighbor cell list in which neighbor cells that are candidates for handover destinations of mobile terminals connected to a cell managed by a base station are registered, A detection step of detecting a new cell that is newly started, resumed, or expanded in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected; A registration step of preferentially registering the detected new cell in the neighbor cell list.
- the second neighbor cell list update method of the present invention includes: A neighbor cell list update method by a base station that manages a cell to which a mobile terminal is connected, A detection step of detecting a new cell that is newly started, resumed, or expanded in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected; A registration step of preferentially registering the detected new cell in a neighbor cell list in which neighbor cells that are candidates for a handover destination of the mobile terminal are registered.
- the detected new cell is added to the neighboring cell list. Register with priority.
- FIG. It is a figure which shows an example of a structure of a general radio
- FIG. It is a figure which shows an example of a structure of the radio
- FIG. 4 shows an example of the configuration of a wireless communication system including the neighboring cell list optimization system 100 according to the first embodiment of the present invention.
- FIG. 4 shows only the mobile terminal 10, the radio base station 30, and the network management system 90 extracted from the components other than the neighboring cell list optimization system in the radio communication system of FIG.
- the neighboring cell list optimization system 100 of the present embodiment includes a measurement information storage unit 101, a measurement information collection unit 102, a new cell detection unit 103, and a neighboring cell list generation unit 104. And is connected to the network management system 90.
- FIG. 4 there are an existing cell 35B and a new cell 35C as neighboring cells of a radio cell (optimization target cell) 35A targeted for optimization (update) of the neighboring cell list.
- the optimization target cell 35A is managed by the radio base station 30A, and the mobile terminal 10A is connected thereto.
- the existing cell 35B is managed by the radio base station 30B, and the mobile terminal 10B is connected thereto.
- the new cell 35C is managed by the radio base station 30C, and the mobile terminal 10C is connected thereto.
- the radio base stations 30A to 30C do not specify which radio base station, they are referred to as radio base stations 30, and the mobile terminals 10A to 10C do not specify which mobile terminal.
- a mobile terminal 10 when the radio base stations 30A to 30C do not specify which radio base station, they are referred to as radio base stations 30, and the mobile terminals 10A to 10C do not specify which mobile terminal. Sometimes referred to as a mobile terminal 10.
- the mobile terminal 10A measures the radio quality of the optimization target cell 35A and the radio quality of the neighboring cells (existing cell 35B and new cell 35), and the measurement information of the radio quality of the optimization target cell 35A and the neighboring cell is a predetermined operation. When the condition is satisfied, the measurement information of the radio quality of the neighboring cell is reported to the radio base station 30A that manages the optimization target cell 35A. In addition, both the Listed Cell and the Detected Cell are included in the adjacent cell from which the mobile terminal 10A measures the radio quality. Specific examples of the radio quality include the reception power of a pilot signal transmitted from the radio base stations 30A, 30B, and 30C, and a signal-to-interference wave ratio.
- the measurement information storage unit 101 is an area in which measurement information of the radio quality of the neighboring cell reported to the radio base station 30A from the mobile terminal 10A connected to the optimization target cell 35A is stored.
- the measurement information collection unit 102 collects the measurement information on the radio quality of the neighboring cell reported to the radio base station 30A from the mobile terminal 10A connected to the optimization target cell 35A, and stores the collected measurement information in the measurement information storage unit 101. Store. In addition, the measurement information collection unit 102 aggregates and summarizes the number of reports, which is the number of times the measurement information is received, for each neighboring cell in which the radio quality measurement information is reported from the mobile terminal 10A to the radio base station 30A. The number of reports is stored in the measurement information storage unit 101 in association with the identification information of the neighboring cell.
- the radio base station 30A is preset with operating conditions for performing a reporting operation in which the mobile terminal 10A reports radio quality measurement information to the radio base station 30A. The mobile terminal 10A sets the operating conditions to the radio base station 30A. Notification is made in advance from 30A via the downlink.
- the new cell detection unit 103 acquires, from the measurement information storage unit 101, the identification information of the neighboring cell in which the radio quality measurement information is reported from the mobile terminal 10A to the radio base station 30A, and based on the acquired identification information,
- the cell operation start time is acquired from the base station management unit 105 of the network management system 90, and a new cell is detected from neighboring cells based on the acquired operation start time.
- the new cell detection unit 103 determines that another neighboring cell that has not been detected as a new cell is an existing cell, and sets the new cell of the neighboring cell or the cell type of the existing cell as the identification information of the neighboring cell and the number of reports. And stored in the measurement information storage unit 101.
- the adjacent cell list generation unit 104 acquires the number of measurement information reports and cell types for each adjacent cell from the measurement information storage unit 101. Then, based on these information, the neighboring cell list generation unit 104 determines a neighboring cell to be registered in the neighboring cell list of the optimization target cell 35A, updates the neighboring cell list by registering the decided neighboring cell, The updated neighbor cell list is notified to the base station management unit 105 of the network management system 90.
- the neighboring cell list for example, optimized cell 35A wireless base station 30A that manages the other wireless base station 30B, to evaluate the distance between the 30C, distance radio base station 30 in order of closeness
- the list may be a list in which the extracted radio cells managed by the radio base station 30 are registered. Alternatively, it may be an empty adjacent cell list.
- FIG. 5 is a flowchart for explaining the operation of the neighbor cell list optimization system 100.
- the measurement information collection unit 102 transmits the measurement information of the radio quality of the neighboring cell to the mobile terminal 10 for all the radio base stations 30 under the neighboring cell list optimization system 100.
- Set the operating conditions for the reporting operation The operating conditions set in the radio base station 30 are notified to the mobile terminal 10 via the downlink.
- the mobile terminal 10 measures the radio quality of the radio cell and the adjacent cell to which the mobile terminal 10 is connected, and when the measurement information satisfies the above operating conditions, the mobile terminal 10 transmits the radio quality measurement information of the adjacent cell to the radio base station 30. Report.
- the measurement information collection unit 102 collects the measurement information of the radio quality of the neighboring cell reported to the radio base station 30 by the mobile terminal 10 according to the above operating conditions, and stores the collected measurement information in the measurement information storage unit 101. To do. Further, the measurement information collection unit 102 totals the number of reports of measurement information for each adjacent cell, and stores the totalization result (M X ) in the measurement information storage unit 101 (step S101).
- the above operating conditions will be described later at the end of the description of this flowchart.
- the measurement information collection unit 102 selects the optimization target cell X (step S102).
- step S102 for example, all the radio base stations 30 under the neighbor cell list optimization system 100 are sequentially selected as optimization target cells.
- a new cell managed by the newly installed radio base station 30 and an existing cell managed by the radio base station 30 within a certain distance range from the new cell may be selected as the optimization target cell.
- a radio cell having a handover failure rate equal to or higher than a threshold may be detected as a radio cell with degraded radio quality, and such a radio cell may be selected as an optimization target cell.
- the new cell detection unit 103 accesses the measurement information storage unit 101, and refers to the count result (M X ) of the number of reports from the mobile terminal 10 connected to the optimization target cell X selected in step S102. (Step S103), a new cell is detected from the neighboring cells included in the tabulation result (M X ). At this time, the new cell detection unit 103 determines that another adjacent cell that has not been detected as a new cell is an existing cell, and determines the new cell of the adjacent cell or the cell type of the existing cell as the total cell result (M X ) And stored in the measurement information storage unit 101 (step S104). Details of the new cell detection method will be described later with reference to FIG.
- FIG. 6 is a diagram illustrating an example of a management table of neighboring cells of the optimization target cell X stored in the measurement information storage unit 101 in the present embodiment.
- the management table includes the number of measurement information reports (n) for each neighboring cell in which the radio quality measurement information is reported from the mobile terminal 10 connected to the optimization target cell X to the radio base station 30. X ) and the cell type of a new cell or an existing cell are recorded in association with each other.
- the number of reports collected in step S101 is stored in the number of reports (n X ), and the cell type determined in step S104 is stored in the cell type.
- the adjacent cell list generation unit 104 determines the maximum (NCL max ) number of adjacent cells to be registered in the adjacent cell list from the adjacent cells managed by the management table in FIG. 6 (step S105).
- NCL max is set to a value that does not exceed the maximum number of radio cells (L max ) that can be registered in the neighbor cell list. Details of a method for determining an adjacent cell to be registered in the adjacent cell list will be described later with reference to FIG.
- the neighbor cell list generation unit 104 updates the neighbor cell list of the optimization target cell X by registering the neighbor cell determined in step S105, and updates the radio base station 30 that manages the optimization target cell X.
- the updated neighbor cell list is notified to the base station management unit 105 of the network management system 90 that is managing.
- the base station management unit 105 updates the neighbor cell list of the optimization target cell X to the notified content (step S106), and ends the process.
- step S101 in FIG. 5 Next, the operating conditions notified in step S101 in FIG. 5 will be described.
- an example in which Expression (1) described in Non-Patent Document 1 is used as the operation condition will be described.
- the mobile terminal 10 When using the operation condition of Equation (1) as a trigger condition for handover execution determination, the mobile terminal 10 usually measures the radio quality of only the Listed Cells registered in the neighboring cell list.
- the measurement information collection unit 102 requests the mobile terminal 10 to measure the radio quality of the listed cell and the detected cell.
- the measurement information collection unit 102 requests radio quality measurement from all mobile terminals 10 connected to the optimization target cell.
- measurement is performed on a part of the mobile terminals 10 connected to the optimization target cell, such as requesting measurement only from the mobile terminals 10 randomly selected from the mobile terminals 10 connected to the optimization target cell. May be requested.
- the same mobile terminal 10 is requested to measure the radio quality of both the Listed Cell and the Detected Cell.
- only a part of the mobile terminals 10 that have requested the measurement of the radio quality of the listed cell may also request the measurement of the radio quality of the detected cell. May be measured.
- the received power of the pilot signal transmitted from the radio base station 30 is measured as the radio quality, but other radio quality indicators such as a signal-to-interference wave ratio are measured. It doesn't matter if you do. Further, as the radio quality, at least one of the reception power of the pilot signal, the signal-to-interference wave ratio, and the like may be measured.
- the example which used the trigger condition of Formula (1) as an operation condition is shown, for example, when Pt is more than a threshold value or the pilot signal transmitted from the adjacent base station 30 is shown.
- Other conditions such as causing the mobile terminal 10 to report when the signal-to-interference wave ratio is equal to or greater than a predetermined threshold may be used.
- FIG. 7 is a flowchart illustrating a method for detecting a new cell.
- the new cell detection unit 103 performs the operation start time (t Y of the adjacent cell) for each adjacent cell (Y) for which the measurement information of the radio quality is reported from the mobile terminal 10 to the radio base station 30.
- t Y the operation start time
- the base station management unit 105 of the network management system 90 Is acquired from the base station management unit 105 of the network management system 90 (step S201), and the current time (t) at the time when a new cell is detected is used as an internal clock (not shown) of the adjacent cell list optimization system 100.
- Step S202 it is determined whether or not the adjacent cell (Y) is within a certain period (T 0 ) from the start of operation (step S203).
- step S203 the new cell detection unit 103 determines that the adjacent cell (Y) is a new cell when the adjacent cell (Y) is within a certain period (T 0 ) from the start of operation (step S204). In other cases, the adjacent cell (Y) is determined as an existing cell (step S205).
- the network management system 90 can start the neighboring cell newly started or restarted, The notification of the identification information of the neighboring cell whose geographical range has been changed may be received, and the notified neighboring cell may be determined as a new cell.
- the operation start time of the neighboring cell cannot be acquired from the network management system 90, the time when the measurement information of the neighboring cell is first reported to the radio base station 30 from the mobile terminal 10 is used as the operation start time. However, a new cell may be detected.
- FIG. 8 is a flowchart for explaining a neighbor cell determination method.
- the neighboring cell list generation unit 104 first initializes a set (S 1 ), (S 2 ), and (S 3 ) of neighboring cells to an empty set (step S300).
- the neighbor cell list generation unit 104 extracts the maximum (NCL max -NCL Imm ) neighbor cells in descending order of the number of reports (n X ) from the neighbor cells managed in the management table of FIG. Store in the set (S 1 ) (step S301).
- NCL Imm is the maximum number of new cells to be preferentially registered, and is set to a value in the range of 0 to NCL max .
- the neighboring cell list generation unit 104 compares the size of the total number (M) of neighboring cells managed by the management table of FIG. 6 with the size of (NCL max -NCL Imm ) (step S302), If NCL max -NCL Imm ) is equal to or greater than the total number (M), it is determined that the neighboring cell included in the set (S 1 ) is registered in the neighboring cell list (step S306), and the process ends.
- the neighboring cell list generation unit 104 sets the set (S 1 ) among the neighboring cells managed by the management table of FIG. New cells that are not included are extracted in the descending order of the number of reports (n X ) (NCL Imm ) and stored in the set (S 2 ) (step S303).
- the neighboring cell list generation unit 104 compares the size of the number of cells N 2 included in the set (S 2 ) with the size of NCL Imm (step S304), and if the number of cells N 2 is NCL Imm or more. If there is, it is determined that the neighboring cell included in the set (S 1 + S 2 ) is registered in the neighboring cell list (step S306), and the process is terminated.
- step S304 if the number of cells N 2 is NCL Imm smaller than, the neighbor cell list generation unit 104, of the adjacent cell managed by the management table of FIG. 6, in the set (S 1 + S 2)
- the largest number (NCL Imm ⁇ N 2 ) of the cells with no reports is extracted in the descending order of the number of reports (n X ) and stored in the set (S 3 ) (step S305).
- the neighboring cell list generation unit 104 determines to register the neighboring cells included in the set (S 1 + S 2 + S 3 ) in the neighboring cell list (step S306), and ends the process.
- FIG. 9 is a diagram illustrating an example of an adjacent cell determined according to the adjacent cell determination method of FIG.
- adjacent cells in the management table are arranged in descending order of the number of reports (n X ).
- the neighboring cell list optimization system 100 allows the mobile terminal 10 connected to the optimization target cell X to wirelessly connect to the radio base station 30. A new cell is detected from neighboring cells reporting quality measurement information, and the new cells are extracted in descending order of the number of reports from the mobile terminal 10, and the extracted new cell is added to the neighboring cell list of the optimization target cell X. Register with priority.
- the neighboring cell list optimization system 200 of this embodiment is different from that of the first embodiment in the neighboring cell list generation unit 104. The difference is that the time increase rate (r X ) of the number of reports (n X ) is calculated for each new cell, and the new cells are registered in the neighboring cell list in descending order of the time increase rate (r X ).
- FIG. 10 is a flowchart for explaining a neighbor cell determination method in the neighbor cell list generation unit 104 of the neighbor cell list optimization system 200 of this embodiment.
- the same processes as those in FIG. 8 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the neighboring cell list generation unit 104 first performs the processing from steps S300 to S302 similar to FIG.
- step S302 (NCL max - NCL Imm ) If the total number (M) is smaller than the neighbor cell list generation unit 104, for each set new cell which is not included in the (S 1) (Y), new cell (Y ) to calculate the operation start time of (t Y) from the number of reported during the current time (t) (the time rate of increase n XY) (r XY) (step S401).
- the time increase rate (r XY ) can be calculated using, for example, Equation (3).
- the neighboring cell list generation unit 104 extracts the maximum number (NCL Imm ) of new cells not included in the set (S 1 ) in descending order of the time increase rate (r X ), and stores them in the set (S 2 ). (Step S402).
- FIG. 11 is a diagram illustrating an example of a management table of neighboring cells of the optimization target cell X stored in the measurement information storage unit 101 in the present embodiment.
- the management table of the present embodiment has a time increase rate (r) of the number of reports (n XY ) for the new cell as compared to the management table of the first embodiment shown in FIG. X ) differs in that it is also recorded.
- the adjacent cell list generation unit 104 performs the processing from steps S304 to S306 similar to FIG. (2-3) Effects of Second Embodiment
- the neighboring cell list optimization system 200 extracts new cells in descending order of the rate of increase in the number of reports from the operation start time. Then, the extracted new cell is preferentially registered in the neighboring cell list of the optimization target cell X.
- a new cell with a short elapsed time from the start of operation and a small number of reports is an optimization target compared to other new cells. It was difficult to preferentially register in the neighbor cell list of cell X.
- FIG. 12 shows an example of a configuration of a wireless communication system including the neighboring cell list optimization system 300 according to the third embodiment of the present invention.
- FIG. 12 the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.
- the existing cell 35B and the new cell 35C are network management systems that manage the optimization target cell 35A as compared with the first and second embodiments. It is different in that it is managed by a network management system 90B different from 90A.
- the neighbor cell list optimization system 300 is connected to the network management system 90A and is not connected to the network management system 90B.
- the neighboring cell list optimization system 300 of the present embodiment is newly provided with a mechanism for counting reports from the mobile terminal 10 in a short period compared to the first and second embodiments, and totaling in a short period of time. The difference is that a new cell can be detected without going through the network management system 90 based on the number of reports (n ′ X ). For this reason, the new cell detection unit 103 of the neighbor cell list optimization system 300 may not include an interface for acquiring the operation start time of the neighbor cell from the network management system 90A. (3-2) Operation of Third Embodiment Next, the operation of the neighboring cell list optimization system 300 of this embodiment will be described with reference to the flowchart of FIG.
- the measurement information collection unit 102 collects the measurement information of neighboring cells reported to the radio base station 30 by the mobile terminal 10, and reports the measurement information for each neighboring cell. The number is totaled, and the totaled result is stored in the measurement information storage unit 101.
- the measurement information collecting unit 102 reports the number of aggregated at the same counting period as the first and second embodiments in conjunction with (n X), reported the number of counted with a shorter counting period (n 'X) is also an aggregate As a result, it is stored in the measurement information storage unit 101.
- FIG. 13 is a diagram illustrating an example of a management table of neighboring cells of the optimization target cell X stored in the measurement information storage unit 101 in the present embodiment.
- the management table of the present embodiment includes the number of reports (n X ) totaled over a long period for each adjacent cell as compared to the management table of the first embodiment shown in FIG. 6. The difference is that the number of reports (n ' X ) compiled in a short period is also recorded. The number of reports (n ′ X ) is periodically updated so that the latest tabulation results are recorded.
- the new cell detection unit 103 detects a new cell from the neighboring cells managed by the management table of FIG. 13 based on the number of reports (n ′ X ) counted in a short period.
- FIG. 14 is a flowchart illustrating a new cell detection method by the new cell detection unit 103 of the neighbor cell list optimization system 300 according to the present embodiment.
- the new cell detection unit 103 acquires the number of reports (n X ) for each adjacent cell from the management table of FIG. 13 stored in the measurement information storage unit 101 (step S501).
- the largest (NCL max -NCL Imm ) adjacent cells are extracted in descending order of the number of reports (n X ), and stored in the set (S 4 ) (step S502).
- the new cell detection unit 103 acquires the number of short-term reports (n ′ X ) of neighboring cells not included in the set (S 4 ) among neighboring cells managed by the management table of FIG. S503), the largest (NCL Imm ) adjacent cells are extracted in the descending order of the number of reports (n ′ X ) and stored in the set (S 5 ) (step S504).
- the new cell detection unit 103 determines whether or not the adjacent cell is included in the set (S 5 ) (step S505).
- the new cell detection unit 103 determines that the neighboring cell is a new cell (step S506), and otherwise, the neighboring cell. Is determined as an existing cell (step S507).
- a method for detecting a new cell in addition to the above-described method, another method for determining a neighboring cell having a short-term number of reports (n ′ X ) as a certain number or more as a new cell may be used.
- the neighboring cells included in the set (S 5) determines that the new cell, the other adjacent cell and existing cells It may be a determination method.
- the neighboring cell list generation unit 104 determines to preferentially register the detected new cell in the neighboring cell list, as in the first or second embodiment.
- new cells may be preferentially registered in descending order of the number of reports (n ′ X ) compiled in a short period.
- the neighboring cell list optimization system 300 is newly provided with a mechanism for counting reports from mobile terminals in a short period of time. A new cell is detected without going through the network management system 90 based on the number of reports (n ′ X ) aggregated between the two.
- the present invention is not limited to the wireless communication system shown in FIG. 2, but is a wireless communication system including a wireless base station control device between the mobile communication core network 50 and the wireless base station 30, or an adjacent cell list.
- the function of the optimization system can be applied to a radio communication system incorporated in the radio base station controller, the radio base station 30, or the network management system 90.
- the present invention can also be applied to a case where a radio base station management apparatus is provided between the neighboring cell list optimization system and the radio base station 30.
- the neighboring cell list optimization system manages the aggregation result of the measurement information of the radio quality measured by the mobile terminal 10 .
- You may manage within a control apparatus, the wireless base station 30, or the network management system 90.
- FIG. when the radio base station 30 has a function equivalent to the radio quality measurement function of the mobile terminal 10, the radio base station 30 may measure the radio quality.
- the radio communication system includes an adjacent cell list optimization system separately from the radio base station 30, and the adjacent cell list set in the radio base station 30 is changed to the adjacent cell.
- the radio base station 30 can update the neighboring cell list set in the own station.
- the measurement information is information that can be collected or stored by the radio base station 30. Therefore, the radio base station 30 can detect a new cell based on the measurement information, preferentially register the new cell in the adjacent cell list set in the own station, and update the adjacent cell list.
- a wireless communication system comprising a mobile terminal and a base station that manages a cell to which the mobile terminal is connected, A new cell detection unit that detects a new cell that is newly started, restarted, or changed in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected; Wherein the neighbor cell list that registered the adjacent cell as a handover destination candidate of a mobile terminal, a radio communication system having a neighboring cell list generation unit for registering a new cell detected by the new cell detection unit preferentially.
- (Appendix 2) A network management system for managing the operational state of the cell; The wireless communication system according to appendix 1, wherein the new cell detection unit acquires information on a new cell from the network management system.
- the mobile terminal measures the radio quality of the cell to which the mobile station is connected and the neighbor cell, and if the measurement information on the radio quality of the cell to which the mobile terminal is connected and the neighbor cell satisfies a predetermined condition, the mobile terminal Report the radio quality measurement information to the base station, The wireless communication system according to supplementary note 1, wherein the new cell detection unit detects the new cell based on the number of reports of measurement information of radio quality for each neighboring cell reported from the mobile terminal.
- the base station transmits a pilot signal;
- the mobile terminal according to any one of appendices 3 to 5, wherein the mobile terminal measures at least one of a reception power or a signal-to-interference ratio of a pilot signal transmitted from a base station managing the cell as a radio quality of the cell.
- the wireless communication system according to 1.
- a neighbor cell list optimization system that updates a neighbor cell list in which neighbor cells that are candidates for a handover destination of a mobile terminal connected to a cell managed by a base station are registered, A new cell detection unit that detects a new cell that is newly started, restarted, or expanded in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected;
- An adjacent cell list optimization system comprising: an adjacent cell list generation unit that preferentially registers a new cell detected by the new cell detection unit in the adjacent cell list.
- the measurement information collection unit collects at least one of reception power or signal-to-interference wave ratio at a mobile terminal of a pilot signal transmitted from a base station managing the neighboring cell as measurement information of radio quality of the neighboring cell
- the adjacent cell list optimization system according to any one of appendices 9 to 11, wherein (Appendix 13) A base station that manages a cell to which a mobile terminal is connected, A new cell detection unit that detects a new cell that is newly started, restarted, or expanded in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected; A base station comprising: a neighbor cell list generation unit that preferentially registers a new cell detected by the new cell detection unit in a neighbor cell list in which neighbor cells that are candidates for a handover destination of the mobile terminal are registered.
- (Appendix 14) 14 The base station according to appendix 13, wherein the new cell detection unit acquires information on a new cell from a network management system that manages a cell operating state.
- An information gathering unit The base station according to appendix 13, wherein the new cell detection unit detects the new cell based on the number of reports of measurement information of radio quality for each neighboring cell reported from the mobile terminal.
- the neighboring cell list generation unit When the new cell detection unit detects an unregistered new cell in the neighboring cell list, the neighboring cell list generation unit, in order from the largest number of reports of the radio quality measurement information reported from the mobile terminal, The base station according to attachment 15, wherein the new cell is preferentially registered in the neighbor cell list.
- the neighbor cell list generation unit When an unregistered new cell is detected in the adjacent cell list by the new cell detection unit, a time increase rate of the number of reports of radio quality measurement information reported from the mobile terminal is calculated for each new cell. , The base station according to supplementary note 15, wherein the new cell is preferentially registered in the neighbor cell list in descending order of the time increase rate.
- the measurement information collection unit collects at least one of reception power or signal-to-interference wave ratio at a mobile terminal of a pilot signal transmitted from a base station managing the neighboring cell as measurement information of radio quality of the neighboring cell
- the base station according to any one of supplementary notes 15 to 17.
- a neighbor cell list update method by a neighbor cell list optimization system that updates a neighbor cell list in which neighbor cells that are candidates for handover destinations of mobile terminals connected to a cell managed by a base station are registered, A detection step of detecting a new cell that is newly started, resumed, or expanded in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected; A neighboring cell list updating method comprising: a registration step of preferentially registering the detected new cell in the neighboring cell list.
- (Appendix 21) Collection that collects the measurement information of the radio quality of the neighboring cell reported from the mobile terminal to the base station when the radio quality measurement information of the cell to which the mobile terminal is connected and the neighboring cell satisfies a predetermined condition And further comprising steps The neighbor cell list update method according to supplementary note 19, wherein, in the detection step, the new cell is detected based on the number of reports of measurement information of radio quality for each neighbor cell reported from the mobile terminal.
- a neighbor cell list update method by a base station that manages a cell to which a mobile terminal is connected A detection step of detecting a new cell that is newly started, resumed, or expanded in geographical range from neighboring cells adjacent to the cell to which the mobile terminal is connected;
- a neighboring cell list update method comprising: a registration step of preferentially registering the detected new cell in a neighboring cell list in which neighboring cells that are candidates for a handover destination of the mobile terminal are registered.
- Appendix 26 26.
- (Appendix 27) Collection that collects the measurement information of the radio quality of the neighboring cell reported from the mobile terminal to the base station when the radio quality measurement information of the cell to which the mobile terminal is connected and the neighboring cell satisfies a predetermined condition And further comprising steps 26.
- the present invention can also be used for a network management system in a mobile communication network.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
移動端末と、前記移動端末が接続するセルを管理する基地局と、を備える無線通信システムであって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を変更した新規セルを検出する新規セル検出部と、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する。
基地局が管理するセルに接続する移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストを更新する隣接セルリスト最適化システムであって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する新規セル検出部と、
前記隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する。
移動端末が接続するセルを管理する基地局であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する新規セル検出部と、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する。
基地局が管理するセルに接続する移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストを更新する隣接セルリスト最適化システムによる隣接セルリスト更新方法であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する検出ステップと、
前記隣接セルリストに、前記検出された新規セルを優先的に登録する登録ステップと、を有する。
移動端末が接続するセルを管理する基地局による隣接セルリスト更新方法であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する検出ステップと、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記検出された新規セルを優先的に登録する登録ステップと、を有する。
(1)第1の実施形態
(1-1)第1の実施形態の構成
図4は、本発明の第1の実施形態の隣接セルリスト最適化システム100を備えた無線通信システムの構成の一例を示す図である。なお、図4は、図2の無線通信システムにおける隣接セルリスト最適化システム以外の構成要素のうち、移動端末10、無線基地局30、およびネットワーク管理システム90のみを抜粋して図示している。
(1-2)第1の実施形態の動作
次に、隣接セルリスト最適化システム100の動作について説明する。図5は、隣接セルリスト最適化システム100の動作を説明するフローチャートである。
(1-3)第1の実施形態の効果
このように、本実施形態によれば、隣接セルリスト最適化システム100は、最適化対象セルXに接続する移動端末10が無線基地局30に無線品質の測定情報を報告した隣接セルの中から、新規セルを検出し、移動端末10からの報告数が多い順に新規セルを抽出し、抽出した新規セルを最適化対象セルXの隣接セルリストに優先的に登録する。
(2)第2の実施形態
(2-1)第2の実施形態の構成
本実施形態の隣接セルリスト最適化システム200は、第1の実施形態と比較して、隣接セルリスト生成部104において、新規セルごとに報告数(nX)の時間増加率(rX)を算出し、時間増加率(rX)が大きな順に新規セルを隣接セルリストに登録するようにした点が異なる。
(2-2)第2の実施形態の動作
図10は、本実施形態の隣接セルリスト最適化システム200の隣接セルリスト生成部104における隣接セルの決定方法を説明するフローチャートである。なお、図10において、図8と同様の処理については同じ符号を付し、詳細な説明を省略する。
(2-3)第2の実施形態の効果
このように、本実施形態によれば、隣接セルリスト最適化システム200は、運用開始時刻からの報告数の時間増加率が大きい順に新規セルを抽出し、抽出した新規セルを最適化対象セルXの隣接セルリストに優先登録する。
(3)第3の実施形態
(3-1)第3の実施形態の構成
図12は、本発明の第3の実施形態の隣接セルリスト最適化システム300を備えた無線通信システムの構成の一例を示す図である。なお、図12において、図4と同様の構成要素については同じ符号を付し、説明を省略する。
(3-2)第3の実施形態の動作
次に、本実施形態の隣接セルリスト最適化システム300の動作について、図5のフローチャートを参照しながら説明する。
(3-3)第3の実施形態の効果
このように、本実施形態によれば、隣接セルリスト最適化システム300は、移動端末からの報告を短い期間で集計する仕組みを新たに備え、短期間で集計した報告数(n’X)に基づき、ネットワーク管理システム90を介さずに新規セルを検出する。
(4)その他の実施形態
以上、実施形態を参照して本発明を説明したが、本発明は上記実施形態に限定されるものでない。本発明の構成や詳細には、本発明の範囲内で当業者が理解し得る様々な変更をすることができる。
(付記1)
移動端末と、前記移動端末が接続するセルを管理する基地局と、を備える無線通信システムであって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を変更した新規セルを検出する新規セル検出部と、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する無線通信システム。
(付記2)
セルの運用状態を管理するネットワーク管理システムをさらに有し、
前記新規セル検出部は、前記ネットワーク管理システムから、新規セルの情報を取得する、付記1記載の無線通信システム。
(付記3)
前記移動端末は、自端末が接続するセルおよび前記隣接セルの無線品質を測定し、自端末が接続するセルおよび当該隣接セルの無線品質の測定情報が所定の条件を満たす場合に、当該隣接セルの無線品質の測定情報を前記基地局に報告し、
前記新規セル検出部は、前記移動端末から報告された隣接セルごとの無線品質の測定情報の報告数に基づき、前記新規セルを検出する、付記1記載の無線通信システム。
(付記4)
前記隣接セルリスト生成部は、前記新規セル検出部によって前記隣接セルリストに未登録の新規セルが検出された場合、前記移動端末から報告された無線品質の測定情報の報告数が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記3に記載の無線通信システム。
(付記5)
前記隣接セルリスト生成部は、
前記新規セル検出部によって前記隣接セルリストに未登録の新規セルが検出された場合、前記新規セルごとに、前記移動端末から報告された無線品質の測定情報の報告数の時間増加率を算出し、
前記時間増加率が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記3に記載の無線通信システム。
(付記6)
前記基地局は、パイロット信号を送信し、
前記移動端末は、セルの無線品質として、当該セルを管理する基地局から送信されたパイロット信号の受信電力または信号対干渉波比の少なくとも1つを測定する、付記3から5のいずれか1項に記載の無線通信システム。
(付記7)
基地局が管理するセルに接続する移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストを更新する隣接セルリスト最適化システムであって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する新規セル検出部と、
前記隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する隣接セルリスト最適化システム。
(付記8)
前記新規セル検出部は、セルの運用状態を管理するネットワーク管理システムから、新規セルの情報を取得する、付記7記載の隣接セルリスト最適化システム。
(付記9)
前記移動端末が接続するセルおよび前記隣接セルの無線品質の測定情報が所定の条件を満たす場合に、前記移動端末から前記基地局に報告された当該隣接セルの無線品質の測定情報を収集する測定情報収集部をさらに有し、
前記新規セル検出部は、前記移動端末から報告された隣接セルごとの無線品質の測定情報の報告数に基づき、前記新規セルを検出する、付記7記載の隣接セルリスト最適化システム。
(付記10)
前記隣接セルリスト生成部は、前記新規セル検出部によって前記隣接セルリストに未登録の新規セルが検出された場合、前記移動端末から報告された無線品質の測定情報の報告数が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記9に記載の隣接セルリスト最適化システム。
(付記11)
前記隣接セルリスト生成部は、
前記新規セル検出部によって前記隣接セルリストに未登録の新規セルが検出された場合、前記新規セルごとに、前記移動端末から報告された無線品質の測定情報の報告数の時間増加率を算出し、
前記時間増加率が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記9に記載の隣接セルリスト最適化システム。
(付記12)
前記測定情報収集部は、隣接セルの無線品質の測定情報として、当該隣接セルを管理する基地局から送信されたパイロット信号の前記移動端末における受信電力または信号対干渉波比の少なくとも1つを収集する、付記9から11のいずれか1項に記載の隣接セルリスト最適化システム。
(付記13)
移動端末が接続するセルを管理する基地局であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する新規セル検出部と、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する基地局。
(付記14)
前記新規セル検出部は、セルの運用状態を管理するネットワーク管理システムから、新規セルの情報を取得する、付記13記載の基地局。
(付記15)
前記移動端末が接続するセルおよび前記隣接セルの無線品質の測定情報が所定の条件を満たす場合に、前記移動端末から前記基地局に報告された当該隣接セルの無線品質の測定情報を収集する測定情報収集部をさらに有し、
前記新規セル検出部は、前記移動端末から報告された隣接セルごとの無線品質の測定情報の報告数に基づき、前記新規セルを検出する、付記13記載の基地局。
(付記16)
前記隣接セルリスト生成部は、前記新規セル検出部によって前記隣接セルリストに未登録の新規セルが検出された場合、前記移動端末から報告された無線品質の測定情報の報告数が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記15に記載の基地局。
(付記17)
前記隣接セルリスト生成部は、
前記新規セル検出部によって前記隣接セルリストに未登録の新規セルが検出された場合、前記新規セルごとに、前記移動端末から報告された無線品質の測定情報の報告数の時間増加率を算出し、
前記時間増加率が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記15に記載の基地局。
(付記18)
前記測定情報収集部は、隣接セルの無線品質の測定情報として、当該隣接セルを管理する基地局から送信されたパイロット信号の前記移動端末における受信電力または信号対干渉波比の少なくとも1つを収集する、付記15から17のいずれか1項に記載の基地局。
(付記19)
基地局が管理するセルに接続する移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストを更新する隣接セルリスト最適化システムによる隣接セルリスト更新方法であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する検出ステップと、
前記隣接セルリストに、前記検出された新規セルを優先的に登録する登録ステップと、を有する隣接セルリスト更新方法。
(付記20)
前記検出ステップでは、セルの運用状態を管理するネットワーク管理システムから、新規セルの情報を取得する、付記19記載の隣接セルリスト更新方法。
(付記21)
前記移動端末が接続するセルおよび前記隣接セルの無線品質の測定情報が所定の条件を満たす場合に、前記移動端末から前記基地局に報告された当該隣接セルの無線品質の測定情報を収集する収集ステップをさらに有し、
前記検出ステップでは、前記移動端末から報告された隣接セルごとの無線品質の測定情報の報告数に基づき、前記新規セルを検出する、付記19記載の隣接セルリスト更新方法。
(付記22)
前記登録ステップでは、前記隣接セルリストに未登録の新規セルが検出された場合、前記移動端末から報告された無線品質の測定情報の報告数が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記21に記載の隣接セルリスト更新方法。
(付記23)
前記隣接セルリストに未登録の新規セルが検出された場合、前記新規セルごとに、前記移動端末から報告された無線品質の測定情報の報告数の時間増加率を算出する算出ステップをさらに有し、
前記登録ステップでは、前記時間増加率が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記21に記載の隣接セルリスト更新方法。
(付記24)
前記収集ステップでは、隣接セルの無線品質の測定情報として、当該隣接セルを管理する基地局から送信されたパイロット信号の前記移動端末における受信電力または信号対干渉波比の少なくとも1つを収集する、付記21から23のいずれか1項に記載の隣接セルリスト更新方法。
(付記25)
移動端末が接続するセルを管理する基地局による隣接セルリスト更新方法であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する検出ステップと、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記検出された新規セルを優先的に登録する登録ステップと、を有する隣接セルリスト更新方法。
(付記26)
前記検出ステップでは、セルの運用状態を管理するネットワーク管理システムから、新規セルの情報を取得する、付記25記載の隣接セルリスト更新方法。
(付記27)
前記移動端末が接続するセルおよび前記隣接セルの無線品質の測定情報が所定の条件を満たす場合に、前記移動端末から前記基地局に報告された当該隣接セルの無線品質の測定情報を収集する収集ステップをさらに有し、
前記検出ステップでは、前記移動端末から報告された隣接セルごとの無線品質の測定情報の報告数に基づき、前記新規セルを検出する、付記25記載の隣接セルリスト更新方法。
(付記28)
前記登録ステップでは、前記隣接セルリストに未登録の新規セルが検出された場合、前記移動端末から報告された無線品質の測定情報の報告数が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記27に記載の隣接セルリスト更新方法。
(付記29)
前記隣接セルリストに未登録の新規セルが検出された場合、前記新規セルごとに、前記移動端末から報告された無線品質の測定情報の報告数の時間増加率を算出する算出ステップをさらに有し、
前記登録ステップでは、前記時間増加率が多い順に、前記新規セルを隣接セルリストに優先的に登録する、付記27に記載の隣接セルリスト更新方法。
(付記30)
前記収集ステップでは、隣接セルの無線品質の測定情報として、当該隣接セルを管理する基地局から送信されたパイロット信号の前記移動端末における受信電力または信号対干渉波比の少なくとも1つを収集する、付記27から29のいずれか1項に記載の隣接セルリスト更新方法。
Claims (10)
- 移動端末と、前記移動端末が接続するセルを管理する基地局と、を備える無線通信システムであって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を変更した新規セルを検出する新規セル検出部と、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する無線通信システム。 - セルの運用状態を管理するネットワーク管理システムをさらに有し、
前記新規セル検出部は、前記ネットワーク管理システムから、新規セルの情報を取得する、請求項1記載の無線通信システム。 - 前記移動端末は、自端末が接続するセルおよび前記隣接セルの無線品質を測定し、自端末が接続するセルおよび当該隣接セルの無線品質の測定情報が所定の条件を満たす場合に、当該隣接セルの無線品質の測定情報を前記基地局に報告し、
前記新規セル検出部は、前記移動端末から報告された隣接セルごとの無線品質の測定情報の報告数に基づき、前記新規セルを検出する、請求項1記載の無線通信システム。 - 前記隣接セルリスト生成部は、前記新規セル検出部によって前記隣接セルリストに未登録の新規セルが検出された場合、前記移動端末から報告された無線品質の測定情報の報告数が多い順に、前記新規セルを隣接セルリストに優先的に登録する、請求項3に記載の無線通信システム。
- 前記隣接セルリスト生成部は、
前記新規セル検出部によって前記隣接セルリストに未登録の新規セルが検出された場合、前記新規セルごとに、前記移動端末から報告された無線品質の測定情報の報告数の時間増加率を算出し、
前記時間増加率が多い順に、前記新規セルを隣接セルリストに優先的に登録する、請求項3に記載の無線通信システム。 - 前記基地局は、パイロット信号を送信し、
前記移動端末は、セルの無線品質として、当該セルを管理する基地局から送信されたパイロット信号の受信電力または信号対干渉波比の少なくとも1つを測定する、請求項3から5のいずれか1項に記載の無線通信システム。 - 基地局が管理するセルに接続する移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストを更新する隣接セルリスト最適化システムであって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する新規セル検出部と、
前記隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する隣接セルリスト最適化システム。 - 移動端末が接続するセルを管理する基地局であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する新規セル検出部と、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記新規セル検出部によって検出された新規セルを優先的に登録する隣接セルリスト生成部と、を有する基地局。 - 基地局が管理するセルに接続する移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストを更新する隣接セルリスト最適化システムによる隣接セルリスト更新方法であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する検出ステップと、
前記隣接セルリストに、前記検出された新規セルを優先的に登録する登録ステップと、を有する隣接セルリスト更新方法。 - 移動端末が接続するセルを管理する基地局による隣接セルリスト更新方法であって、
前記移動端末が接続するセルに隣接する隣接セルの中から、新たに運用を開始、再開、または地理的範囲を拡大した新規セルを検出する検出ステップと、
前記移動端末のハンドオーバ先の候補となる隣接セルを登録した隣接セルリストに、前記検出された新規セルを優先的に登録する登録ステップと、を有する隣接セルリスト更新方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012532909A JPWO2012032886A1 (ja) | 2010-09-08 | 2011-08-03 | 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 |
EP11823365.9A EP2615868B1 (en) | 2010-09-08 | 2011-08-03 | Wireless communication system and neighbor cell list update method |
US13/813,710 US9125226B2 (en) | 2010-09-08 | 2011-08-03 | Wireless communication system, neighbor cell list optimization system, base station, and neighbor cell list update method |
CN2011800432921A CN103098519A (zh) | 2010-09-08 | 2011-08-03 | 无线通信***、相邻小区列表优化***、基站以及相邻小区列表更新方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-201013 | 2010-09-08 | ||
JP2010201013 | 2010-09-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012032886A1 true WO2012032886A1 (ja) | 2012-03-15 |
Family
ID=45810489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/067766 WO2012032886A1 (ja) | 2010-09-08 | 2011-08-03 | 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 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9125226B2 (ja) |
EP (1) | EP2615868B1 (ja) |
JP (1) | JPWO2012032886A1 (ja) |
CN (1) | CN103098519A (ja) |
WO (1) | WO2012032886A1 (ja) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014135598A (ja) * | 2013-01-09 | 2014-07-24 | Ntt Docomo Inc | 無線基地局 |
JP2015179962A (ja) * | 2014-03-19 | 2015-10-08 | Kddi株式会社 | 基地局装置、端末装置、通信システムおよび通信方法 |
JP2015204593A (ja) * | 2014-04-16 | 2015-11-16 | 日本電気株式会社 | 無線基地局、隣接セルリスト作成方法、および隣接セルリスト作成プログラム |
WO2016088876A1 (ja) * | 2014-12-04 | 2016-06-09 | ソフトバンク株式会社 | 基地局装置 |
JP2021535660A (ja) * | 2018-08-20 | 2021-12-16 | 維沃移動通信有限公司Vivo Mobile Communication Co., Ltd. | 測定方法、設定方法および装置 |
JP7062107B1 (ja) * | 2020-12-17 | 2022-05-02 | 財團法人工業技術研究院 | 自己定義ネットワークのカバレッジを最適化する基地局及び方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10172068B2 (en) * | 2014-01-22 | 2019-01-01 | Cisco Technology, Inc. | Service-oriented routing in software-defined MANETs |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006140829A (ja) * | 2004-11-12 | 2006-06-01 | Ntt Docomo Inc | 基地局および移動通信システム並びにスクランブリングコード設定方法 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996024666A1 (en) | 1995-02-10 | 1996-08-15 | Novo Nordisk A/S | Bacillus proteases |
SE515898C2 (sv) | 1999-05-21 | 2001-10-22 | Ericsson Telefon Ab L M | En metod för cellastfördelning i ett cellulärt mobilradiokommunikationssystem |
US6778833B1 (en) * | 2000-11-13 | 2004-08-17 | Sprint Spectrum L.P. | Method for allocating identifiers in a cellular wireless network |
US6917809B2 (en) * | 2001-10-23 | 2005-07-12 | Motorola, Inc. | Method for automatically sorting the neighbor list of a cell in a communications system |
EP1815486B1 (fr) * | 2004-11-22 | 2012-03-14 | Semikron | Systeme de connexion entre batteries de condensateurs |
US20060140117A1 (en) | 2004-12-29 | 2006-06-29 | Naveen Aerrabotu | Apparatus and method for cell selection |
CN101052195B (zh) * | 2006-04-03 | 2010-05-12 | 中兴通讯股份有限公司 | 一种邻区配置和优化装置 |
GB2454399B (en) * | 2006-07-13 | 2011-01-19 | Nec Corp | Cellular system, carrier allocation method thereof, base station, and mobile station |
JP5082390B2 (ja) | 2006-11-03 | 2012-11-28 | 日本電気株式会社 | 移動通信システムにおける移動局の移動管理方法および装置 |
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 |
US20090005052A1 (en) * | 2007-06-30 | 2009-01-01 | David Abusch-Magder | Method and Apparatus for Dynamically Creating and Updating Base Station Neighbor Lists |
CN101370262B (zh) | 2007-08-15 | 2012-02-08 | 中兴通讯股份有限公司 | 邻区列表更新方法及*** |
US20090047958A1 (en) * | 2007-08-16 | 2009-02-19 | Anna Pucar Rimhagen | Neighbor List Management for User Terminal |
WO2009040764A1 (en) * | 2007-09-27 | 2009-04-02 | Nokia Corporation | Preliminary neighbor cell suitability check |
JP5106969B2 (ja) | 2007-10-01 | 2012-12-26 | 株式会社エヌ・ティ・ティ・ドコモ | ユーザ装置及びセルサーチ方法 |
WO2009046776A1 (en) * | 2007-10-08 | 2009-04-16 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement for event triggered adaptive cell detection activity level in discontinuous reception |
JP5131018B2 (ja) * | 2008-05-07 | 2013-01-30 | 富士通株式会社 | 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 |
EP2205023B1 (en) * | 2008-12-31 | 2012-02-08 | Alcatel Lucent | Automatic configuration of a neighbor cell list for a base station in a cellular wireless network |
US8838090B2 (en) * | 2009-01-15 | 2014-09-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Automatic detection and correction of physical cell identity conflicts |
-
2011
- 2011-08-03 JP JP2012532909A patent/JPWO2012032886A1/ja not_active Withdrawn
- 2011-08-03 CN CN2011800432921A patent/CN103098519A/zh active Pending
- 2011-08-03 US US13/813,710 patent/US9125226B2/en active Active
- 2011-08-03 WO PCT/JP2011/067766 patent/WO2012032886A1/ja active Application Filing
- 2011-08-03 EP EP11823365.9A patent/EP2615868B1/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006140829A (ja) * | 2004-11-12 | 2006-06-01 | Ntt Docomo Inc | 基地局および移動通信システム並びにスクランブリングコード設定方法 |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014135598A (ja) * | 2013-01-09 | 2014-07-24 | Ntt Docomo Inc | 無線基地局 |
JP2015179962A (ja) * | 2014-03-19 | 2015-10-08 | Kddi株式会社 | 基地局装置、端末装置、通信システムおよび通信方法 |
JP2015204593A (ja) * | 2014-04-16 | 2015-11-16 | 日本電気株式会社 | 無線基地局、隣接セルリスト作成方法、および隣接セルリスト作成プログラム |
US9894666B2 (en) | 2014-12-04 | 2018-02-13 | Softbank Corp. | Base station apparatus for communicating with a mobile base station |
JP2016111463A (ja) * | 2014-12-04 | 2016-06-20 | ソフトバンク株式会社 | 基地局装置 |
US9894667B2 (en) | 2014-12-04 | 2018-02-13 | Softbank Corp. | Base station apparatus for controlling downlink transmission power of a small-cell base station |
WO2016088876A1 (ja) * | 2014-12-04 | 2016-06-09 | ソフトバンク株式会社 | 基地局装置 |
US10098130B2 (en) | 2014-12-04 | 2018-10-09 | Softbank Corp. | Base station apparatus for controlling downlink transmission power of a small-cell base station |
JP2021535660A (ja) * | 2018-08-20 | 2021-12-16 | 維沃移動通信有限公司Vivo Mobile Communication Co., Ltd. | 測定方法、設定方法および装置 |
JP7177251B2 (ja) | 2018-08-20 | 2022-11-22 | 維沃移動通信有限公司 | 測定方法、設定方法および装置 |
JP7462721B2 (ja) | 2018-08-20 | 2024-04-05 | 維沃移動通信有限公司 | 測定方法、設定方法および装置 |
JP7062107B1 (ja) * | 2020-12-17 | 2022-05-02 | 財團法人工業技術研究院 | 自己定義ネットワークのカバレッジを最適化する基地局及び方法 |
US11533634B2 (en) | 2020-12-17 | 2022-12-20 | Industrial Technology Research Institute | Base station and method for optimizing coverage of self-defined network |
Also Published As
Publication number | Publication date |
---|---|
EP2615868A4 (en) | 2017-01-11 |
EP2615868B1 (en) | 2019-01-02 |
EP2615868A1 (en) | 2013-07-17 |
US9125226B2 (en) | 2015-09-01 |
JPWO2012032886A1 (ja) | 2014-01-20 |
CN103098519A (zh) | 2013-05-08 |
US20130137473A1 (en) | 2013-05-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5811089B2 (ja) | 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、隣接セルリスト更新方法およびプログラム | |
JP5505422B2 (ja) | 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 | |
WO2012032886A1 (ja) | 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 | |
JP5626219B2 (ja) | 無線通信システム、自律最適化システム、無線基地局および無線パラメータ設定方法 | |
US9107123B2 (en) | Systems and methods for limiting mobile device measurements for cell reselection and handover | |
US20150181494A1 (en) | Methods, Computer Program Products and Apparatuses Enabling to Improve Handovers in Mobile Communication Networks | |
US9769853B2 (en) | Communication apparatus, communication system, and computer-readable recording medium | |
WO2014056373A1 (zh) | 一种邻区关系更新方法及基站 | |
WO2015141187A1 (ja) | 基地局及び基地局の制御方法 | |
KR101928788B1 (ko) | 교차 안테나 피드 검출을 위한 방법 및 시스템 | |
JP2016039445A (ja) | 自己最適化移動体通信システム | |
WO2017135152A1 (ja) | 無線品質予測装置、無線基地局、無線端末、無線品質予測方法および無線品質予測プログラム | |
RU2640410C2 (ru) | Обрабатывающее информацию устройство, система радиосвязи и способ оценки местоположения терминала | |
US9031560B2 (en) | Condition reporting to enable possible reduction in radio network inefficiencies | |
US8634824B2 (en) | Method for updating a monitoring list of information identifying cells transferred by a base station of a wireless telecommunication network in a cell managed by the base station | |
JP2013038583A (ja) | 無線ネットワークシステム、ネットワーク管理装置及び劣化検出方法 | |
KR20120037602A (ko) | 이동통신 단말 및 이동통신 단말의 엠디티 관련 데이터 관리 방법 | |
EP4068850A1 (en) | Method for identifying user equipment for real-time handover trigger in open-radio access network environment | |
JP7291208B2 (ja) | 制御装置、端末装置、制御方法、及びプログラム | |
CN102291761B (zh) | 一种参数上报和参数配置的方法及设备 | |
JP7248782B2 (ja) | 制御装置、端末装置、制御方法、及びプログラム | |
US11503528B2 (en) | Base station, terminal device, control method, and program for handover connections |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201180043292.1 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11823365 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011823365 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13813710 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2012532909 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |