WO2015141843A1 - 通信制御方法及び無線基地局 - Google Patents
通信制御方法及び無線基地局 Download PDFInfo
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- WO2015141843A1 WO2015141843A1 PCT/JP2015/058581 JP2015058581W WO2015141843A1 WO 2015141843 A1 WO2015141843 A1 WO 2015141843A1 JP 2015058581 W JP2015058581 W JP 2015058581W WO 2015141843 A1 WO2015141843 A1 WO 2015141843A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
- H04W16/08—Load shedding arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a communication control method and a radio base station used in a mobile communication system.
- 3GPP 3rd Generation Partnership Project
- the power source of the cell managed by the wireless base station is turned off (Deactivate) at night when communication traffic is low.
- Non-Patent Document 1 advanced energy saving technology is scheduled to be introduced after Release 12 (see Non-Patent Document 1, for example).
- off target cell the power of one cell
- complement cell the transmission power of other neighboring cells
- coverage of the compensation cell can be expanded (coverage expansion), and the coverage of the off-target cell can be compensated (that is, area compensation).
- the first radio base station calculates a first handover number that is the number of handovers to a cell managed by the first base station and a second handover number that is the number of handovers from the cell. Counting in a predetermined period, and the first radio base station notifies the second radio base station or the maintenance operation device of the first handover number and the second handover number.
- the first radio base station calculates a first handover number that is the number of handovers to a cell managed by the first base station and a second handover number that is the number of handovers from the cell. Counting in a predetermined period, the first radio base station, based on the first handover number, the second handover number, the load status of the cell, and the load status of neighboring cells of the cell, It is determined whether or not to turn off the power of the cell, and when the first radio base station turns off the power of the cell, the second radio base station or the maintenance and operation apparatus will turn off the power of the cell. Including notification.
- 3 is a flowchart (counting the number of handovers) according to the first embodiment. It is a flowchart (OAM power-off determination) according to the first embodiment. It is a flowchart (determination of power-off of eNB which manages an OFF object cell) concerning a 1st embodiment. It is a figure which shows the signal format which concerns on 1st Embodiment. It is a figure which shows the signal format which concerns on 1st Embodiment. It is a figure which shows the signal format which concerns on 1st Embodiment. It is a flowchart concerning a 2nd embodiment. It is a figure which shows the operation
- FIG. 1 is a configuration diagram of an LTE system according to the first embodiment.
- the LTE system includes a UE (User Equipment) 100, an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- UE User Equipment
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- EPC Evolved Packet Core
- the UE 100 corresponds to a mobile station.
- the UE 100 is a mobile communication device, and performs radio communication with a cell (serving cell).
- the configuration of the UE 100 will be described later.
- the E-UTRAN 10 corresponds to a radio access network.
- the E-UTRAN 10 includes an eNB 200 (evolved Node-B).
- the eNB 200 corresponds to a base station.
- the eNB 200 is connected to each other via the X2 interface. The configuration of the eNB 200 will be described later.
- the eNB 200 manages one or a plurality of cells and performs radio communication with the UE 100 that has established a connection with the own cell.
- the eNB 200 has a radio resource management (RRM) function, a user data routing function, a measurement control function for mobility control / scheduling, and the like.
- RRM radio resource management
- Cell is used as a term indicating a minimum unit of a radio communication area, and is also used as a term indicating a function of performing radio communication with the UE 100.
- the EPC 20 corresponds to a core network.
- the EPC 20 includes an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300.
- the MME performs various mobility controls for the UE 100.
- the S-GW controls user data transfer.
- the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
- FIG. 2 is a block diagram of the eNB 200.
- the eNB 200 includes a plurality of antennas 201, a radio transceiver 210, a network interface 220, a memory 230, and a processor 240.
- the memory 230 and the processor 240 constitute a control unit. Further, the memory 230 may be integrated with the processor 240, and this set (that is, a chip set) may be used as the processor.
- the antenna 201 and the wireless transceiver 210 are used for transmitting and receiving wireless signals.
- the radio transceiver 210 converts the baseband signal (transmission signal) output from the processor 240 into a radio signal and transmits it from the antenna 201.
- the radio transceiver 210 converts a radio signal received by the antenna 201 into a baseband signal (received signal) and outputs the baseband signal to the processor 240.
- the network interface 220 is connected to the neighboring eNB 200 via the X2 interface and is connected to the MME / S-GW 300 via the S1 interface.
- the network interface 220 is used for communication performed on the X2 interface and communication performed on the S1 interface.
- the memory 230 stores a program executed by the processor 240 and information used for processing by the processor 240.
- the processor 240 includes a baseband processor that performs modulation / demodulation and encoding / decoding of a baseband signal, and a CPU that executes a program stored in the memory 230 and performs various processes.
- the processor 240 executes various processes and various communication protocols described later.
- a combination of an off target cell that is turned off for power saving and a supplemental cell that compensates for the coverage of the off target cell when the off target cell is turned off is set.
- FIG. 3 is a diagram for explaining advanced ES technology.
- the coverage area is formed by the macro cell E, the off target cell B, and the cells A, C, and D that are neighboring cells of the off target cell B.
- eNB 200-4 and eNB 200-5 are illustrated as eNBs that manage macro cell E and eNBs that manage cell B, respectively, the same eNB may manage macro cell E and cell B.
- the eNB 200-5 that manages the off target cell B notifies the eNB 200-4 of information related to the load of the off target cell B.
- the macro cell E also notifies the off-target cell B of information related to the load (Exchange Load Information).
- the mobile station (UE) 100 communicating under the off target cell B is handed over to the macro cell E.
- the load of the off target cell B is relatively high, for example, when many UEs 100 are communicating under the control of the off target cell B, the load on the macro cell E may be excessive.
- a certain number of UEs 100 are flowing into the off target cell B due to handover from the neighboring cells (cell A, cell C, cell D) to the off target cell B.
- a certain number of UEs 100 are flowing out of the off target cell B due to the handover from the off target cell B to the neighboring cells (cell A, cell C, cell D).
- the eNB 200-4 needs to additionally perform processing related to “handover to the off target cell B” and “handover from the off target cell B”.
- the load of the off target cell B, the number of handovers to the off target cell B, and the number of handovers from the off target cell B are considered. Need to be determined.
- the power of the off target cell When the power of the off target cell is turned off without considering the load of the off target cell, the number of handovers to the off target cell B, and the number of handovers from the off target cell B, the macro cell E and the neighboring cell communicate with each other. There is a case where transmission power or processing load has to be increased in order to secure the capacity. As a result, as shown in FIG. 4, there is a concern that power exceeding the amount of power that can be saved by turning off the power of the off target cell is required.
- the macro cell E and the neighboring cells may not be able to ensure sufficient communication capacity for the UE 100 in communication.
- communication quality QoS: Quality of Service
- the UE 100 in communication needs to be handed over to the off target cell B, which may increase the handover processing load of the UE 100.
- the apparatus that determines the power-off appropriately grasps and executes the effect of the power-off.
- the eNB 200-5 counts the first handover number that is the number of handovers to the cell B in a predetermined period and the second handover number that is the number of handovers from the cell B in the predetermined period.
- the eNB 200-5 may count the HANDOVER REQUEST received from the handover source eNB within a predetermined period and may be used as the first handover number.
- the eNB 200-5 may count the HANDOVER REQUEST transmitted by the eNB 200-5 to another eNB within a predetermined period, and may be used as the second handover number.
- the messages to be counted as the first handover number and the second handover number may be HANDOVER REQUEST ACKNOWLEDGEMENT, HANDOVER PREPARATION FAILURE, UE CONTEXT RELEASE, HANDOVER CANCEL.
- the eNB 200-5 may record the time when each message to be counted is received or transmitted.
- the eNB 200-5 that manages the cell B receives HANDOVER REQUEST, which is a message requesting handover to the cell B, from the eNB that manages the cells A, C, D, and the like (S501).
- This message may include UE History Information.
- the eNB 200-5 counts the number of messages received in S501 and records the reception time (S502). At this time, the eNB 200-5 may record the cell information of the handover source in association with the message.
- the eNB 200-5 transmits a HANDOVER REQUEST ACKNOWLEDGEENT to the eNB that has transmitted the HANDOVER REQUEST (S503).
- the UE 100 that is the target of the handover process hands over to the cell B (S504).
- the eNB 200-5 that manages the cell B transmits HANDOVER REQUEST, which is a message requesting handover from the cell B, to the eNB that manages the cells A, C, D, and the like (S506).
- This message may include UE History Information.
- the eNB 200-5 counts the number of messages transmitted in S506 and records the transmission time (S505). At this time, the eNB 200-5 may record the cell information of the handover destination together.
- the eNB 200-5 receives the HANDOVER REQUEST ACKNOWLEDGEENT from the eNB that has received the HANDOVER REQUEST (S507).
- the UE 100 that is the target of the handover process hands over to a neighboring cell (not shown).
- the eNB 200-5 transmits the Neighbor Cell Situation to the eNB 200-4, the maintenance operation device (OAM), or the eNB that manages the neighboring cell (S509).
- OAM maintenance operation device
- S509 the eNB that manages the neighboring cell
- the Neighbor Cell Situation includes the number of messages counted for a predetermined period, that is, the number of handovers to the cell B in the predetermined period (first handover number) and the number of handovers from the cell B in the predetermined period (second handover number). Including.
- the Neighbor Cell Situation may include handover source cell information, handover destination cell information, a handover reason, a counted period, and a time when each message is transmitted and received.
- the eNB 200-5 transmits the load status of the cell B to the eNB 200-4, the OAM, or the eNB that manages the neighboring cell.
- the load status may be included in the Neighbor Cell Situation or may be included in another message.
- the eNB 200-4, the OAM, or the eNB that manages the neighboring cell determines whether to turn off the power of the off target cell B from the first handover number, the second handover number, and the cell load status.
- the eNB 200-4 or the eNB that manages the neighboring cell may transmit information such as the first handover number and the second handover number to the OAM, and may determine whether the OAM turns off the power.
- eNB200-4 and OAM may acquire NRT (Neighbor Cell Relation Table) from eNB200-5 or other eNB, and may specify the neighboring cell of the off object cell B.
- NRT Neighbor Cell Relation Table
- HO History is an information element for indicating that the information is related to the handover history.
- Incoming HO is an information element indicating the number of first handovers
- Cell ID is an information element indicating a handover source cell.
- Outgoing HO is an information element indicating the number of second handovers.
- Time Period is an information element indicating a period during which the number of handovers is counted.
- the eNB 200-5 When receiving the HANDOVER REQUEST from the neighboring cell (S702, HO request), the eNB 200-5 (off target cell B) confirms the identifier and the reception time of the HANDOVER REQUEST transmission source cell (S704). Then, the eNB 200-5 (off target cell B) counts the number of HANDOVER REQUEST messages for each transmission source cell, records the reception time, and generates a database related to the HO request, that is, the first handover number (S706). ).
- the eNB 200-5 executes the handover to the neighboring cell (S702, HO execution)
- the eNB 200-5 confirms the handover execution time (S703), and relates to the number of executions and the execution time, that is, the second handover.
- a database relating to numbers is generated (S705).
- the number of handover executions may be the number of eNBs 200-5 that have transmitted HANDOVER REQUEST, or may be other messages.
- the eNB 200-5 (off target cell B) is constructed in a device that determines power off, such as OAM, eNB 200-4 (macro cell E), or eNB 200-5 that manages neighboring cells, at a predetermined notification time. Information contained in the database is notified (S707, S708). Information notification is performed using a Neighbor Cell Situation message.
- the notification time may be specified by the eNB 200-4 or the OAM.
- the notification time may be set so as to be automatically notified at regular intervals, or may be set to be notified at every update timing of the database.
- the neighboring cell can appropriately cover the area when the power of the off target cell is turned off.
- the eNB 200-4 can compare the power reduction amount due to turning off the power of the off target cell and the predicted increase in power of the macro cell. it can.
- the eNB 200-5 counts not only the number of handovers to the off target cell (first handover number) but also the number of handovers from the off target cell (second handover number), thereby determining the power off Considering the number of UEs 100 that have a short residence time in the off target cell, the power can be turned off.
- the device that determines the power-off of the OAM or eNB 200-4 or the like in the predetermined time zone is set to confirm whether or not the power-off of the off-target cell can be confirmed (S802). For example, information for confirming whether the power can be turned off from 21:00 to 24:00 is set in the apparatus for determining the power off.
- a device that determines power off before a predetermined time period determines power off of an off target cell, that is, ES, when the load status (Load status) of a neighboring cell of the off target cell is equal to or less than a predetermined threshold. Then, it instructs the off-target cell (S803 (Yes), S810).
- the apparatus that determines the power off may perform S802, S803, and the like in consideration of the load of the off target cell and the load of the cell that compensates for the coverage of the off target cell.
- the handover request status in the past predetermined time zone that is, the first handover The number and the second handover number are confirmed (S803 (No), S804 (Yes), S805).
- the apparatus that determines power off determines power off of the off target cell, that is, ES, and instructs the off target cell. (S808 (Yes), S810).
- the database is acquired from the eNB 200-5 that manages the off target cell B, and the power is turned off based on the acquired database. May be determined (S804 (No), S806, S807 (Yes), S805, S808, S809, S810).
- the power-off of the off-target cell that is, ES is determined, and the off-target cell is instructed (S807 (No), S810).
- the eNB 200-5 When the load status of the neighboring cell is equal to or less than the threshold, the eNB 200-5 turns off the power of the off target cell (executes ES) (S903 (Yes), S907). In this step, the eNB 200-5 may determine power off in consideration of the load status of the off target cell in addition to the load status of the neighboring cell. For example, a similar process may be performed by setting a threshold for the load status of the off target cell.
- the eNB 200-5 When the load status of the neighboring cell exceeds the threshold value and the database related to the handover is held, the eNB 200-5 has the past HO request results in a predetermined time zone (ES implementation target period) in which power-off is considered, that is, The first handover number and the second handover number are confirmed (S904 (Yes), S905).
- ES implementation target period ES implementation target period
- the eNB 200-5 turns off the power of the off target cell (executes ES) (S906 (No), S907).
- the eNB 200-5 inquires of the eNB 200-4 whether or not the off target cell can be powered off (ES execution) (S906 (Yes), S908). ).
- the inquiry may include HO results, that is, the number of first handovers and the number of second handovers in a predetermined period, information on the time when the number of handovers is counted, and the load of the off target cell.
- the eNB 200-4 may notify the eNB 200-5 of the decision to turn off the power of the off target cell instead of the inquiry.
- This notification may also include the number of first handovers and the number of second handovers in a predetermined period, information about the time when the number of handovers is counted, and the load of the off target cell.
- Cell Deactivation Message may be used for notification of inquiry and determination.
- the eNB 200-4 that has received the Cell Deactivation Message transmits the Cell Deactivation Response or the Cell Deactivation Failure to the eNB 200-5 as a response message.
- the Cell Deactivation Response is a message permitting power off and includes information for specifying a cell to be powered off.
- Cell Deactivation Failure is a message notifying that power off is not permitted and includes information indicating the reason for not permitting power off.
- FIG. 10 shows a format example of the Cell Deactivation Message.
- the Cell Deactivation Message includes the Cell ID that is the cell ID of the off target cell, the Cell Resource Situation that indicates the load status of the off target cell, and the total number of handover requests from neighboring cells to the off target cell in the past predetermined time zone (first Number of handovers), Number of Incoming HOs, and the total number of handovers from off-target cells to neighboring cells in the past predetermined time zone (number of handovers performed, number of second handovers), Number of Outgoing HOs, number of first and second handovers 2 Includes Time Period indicating a predetermined time zone in which the number of handovers is counted.
- FIG. 11 shows an example format of Cell Deactivation Response.
- the Cell Deactivation Response includes Deactivated Cell List that is information for specifying a cell group to be powered off.
- Fig. 12 shows a format example of Cell Deactivation Failure.
- the counting method of the first handover number and the second handover number, the notification method to the eNB 200-4, OAM, etc., the information included in the notification, etc. are the same as in the first embodiment.
- the multiple cells to be superimposed are operating in different frequency bands.
- the macro cell E and a partial area may overlap the some cell to superimpose.
- a predetermined communication area is formed by a plurality of cells managed by the eNB 200-5 and a macro cell managed by the eNB 200-4, and a communication capacity in the predetermined communication area is secured by the overlapping cells.
- the eNB 200-5 starts a process for confirming whether it is possible to turn off the power of some of the superimposed cells (S1301).
- the eNB 200-5 confirms the number of handovers of the managed cell (S1302). More specifically, the number of handovers to the managed cell (first handover number) and the number of handovers from the managed cell (second handover number) in a predetermined time zone are confirmed for each cell. Also, the load on the neighboring cell is confirmed (S1302).
- the eNB 200-5 calculates the predicted number of handovers from the load of the neighboring cell, the first number of handovers, and the second number of handovers (S1303).
- the eNB 200-5 turns off the power of all cells managed by the eNB 200-5 (S1304, S1306).
- the eNB 200-5 turns off the power of some cells managed by the eNB 200-5, that is, in the eNB 200-5, in some frequency bands The use is stopped (S1304, S1305).
- some of the cells are cells that can be covered with coverage by other overlapping cells managed by the eNB 200-5.
- the eNB 200-5 may decide to turn off some or all managed cells from the number of first handovers, the number of second handovers, the load of cells to be turned off, and the loads of neighboring cells.
- the eNB 200-5 notifies the eNB 200-4 or the OAM that it has decided to turn off the power.
- This notification includes cell information, the number of first handovers, the number of second handovers, and information related to the period during which the number of handovers is counted.
- the eNB 200-4 or OAM that has received the notification indicates a response message indicating that the power is turned off, a message indicating that the power is not permitted, or a response message indicating that the power is turned off for some cells. Send.
- the message exemplified in the first embodiment may be used for notification and response.
- the eNB 200-4, the OAM, etc. acquire the first handover number, the second handover number, and the load of neighboring cells, calculate the predicted number of handovers, and further calculate the power supply from the predicted number of handovers and the load status of multiple cells. An off decision may be made.
- the eNB 200-5 manages a plurality of cells that are overlapped with the off target cell
- the eNB 200-4 or the OAM manages the load of the plurality of cells managed by the eNB 200-5 and the plurality of cells. It is also possible to obtain the first handover number, the second handover number, and information regarding the time when the number of handovers is counted, and decide to turn off all or some of the cells.
- the apparatus that determines the power-off is the load of the off-target cell and the neighboring cell.
- the power-off of the off target cell is determined in consideration of the load, the number of handovers to the off target cell, the number of handovers from the off target cell, and the predicted number of handovers. For this reason, it is possible to confirm the power saving effect due to power-off in the entire area, for example, the entire area of the macro cell E, and turn off the power.
- the apparatus for determining the power off compares the predicted power increase required for the macro cell E by turning off the power of the off target cell and the power consumption that can be reduced by turning off the power of the off target cell. Power off can be determined.
- the apparatus that determines the power off can determine whether to turn off the power in consideration of the influence on the communication quality (QoS) of the UE 100.
- QoS communication quality
- the eNB 200-5 frequently repeats the power on and off of the off target cell due to a sudden change in the load status, It is possible to avoid increasing the handover load more than necessary.
- the power-off determining device designates the time to turn off the power, or determines the power-off period from the load status of neighboring cells. .
- the device that determines power off can determine the cell to be turned off based on the status of each cell. For example, as shown in FIG. 14, the eNB 200-4 turns off the power based on the load status of the candidate cells A, B, C, and D, the first handover number, and the second handover number to be powered off. Determine the cell.
- Cell D has a large number of UEs 100
- cell B has a large number of handovers from cell D.
- the cell B with the smallest number of UEs 100 is excluded from the candidates for OFF.
- the cell A with a small number of UEs 100 is the off target cell.
- timing for notifying information necessary for determining the power-off of the cell to be turned off and the message other than those described in the embodiment can be applied.
- the degree of the handover number for example, High / Mid / Low, High / Low, or the like may be used.
- the eNB 200-5 may count the first handover number and the second handover number at a designated time, or may count the number of handovers per unit time.
- the eNB 200-5 may acquire the threshold value of the load status and the threshold values of the first handover number and the second handover number from another radio base station or from the OAM.
- the LTE system has been described as an example of the mobile communication system.
- the present invention is not limited to the LTE system, and the present invention may be applied to a system other than the LTE system.
- the present invention is useful in the field of wireless communication such as mobile communication.
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Abstract
Description
以下において、本発明をLTEシステムに適用する場合の実施形態を説明する。
図1は、第1実施形態に係るLTEシステムの構成図である。
第1実施形態に係るLTEシステムには、高度化されたエナジーセービング(ES)技術(Energy Saving Enhancement)が導入される。
本実施形態に係る電源オフ方法では、電源オフを決定する装置は、電源オフによる効果を適切に把握して実行する。
図8を用いて、電源オフを決定する装置(OAMまたはeNB200-4等)が、オフ対象セルBの電源オフを決定する動作を説明する。
第2実施形態について説明する。第1実施形態と共通する部分については説明を省略し、異なる部分に着目して説明する。
図13を用いて、eNB200-5が少なくとも一部のカバレッジが重畳する複数のセルを管理している場合の動作について説明する。
第1実施形態及び第2実施形態を適用することによる、効果について説明する。
eNB200-4と、eNB200-5と、OAM等の機能分担は、上述した以外の分担でも、オフ対象セルの負荷、近隣セルの負荷、第1ハンドオーバ数、第2ハンドオーバ数の状況を考慮した、オフ対象セルの電源オフを決定することが可能である。
Claims (15)
- 第1無線基地局が、自局が管理するセルへのハンドオーバ数である第1ハンドオーバ数と、前記セルからのハンドオーバ数である第2ハンドオーバ数とを所定の期間においてカウントし、
前記第1無線基地局が、第2無線基地局又は保守運用装置に、前記第1ハンドオーバ数及び前記第2ハンドオーバ数を通知する通信制御方法。 - 前記第1無線基地局が、前記セルの負荷状況を、前記第2無線基地局又は前記保守運用装置に通知し、
前記第2無線基地局又は前記保守運用装置が、前記第1ハンドオーバ数と、前記第2ハンドオーバ数と、前記セルの負荷状況とに基づいて、前記セルの電源をオフにするか否かを決定する請求項1に記載の通信制御方法。 - 前記第1無線基地局が、少なくとも一部のカバレッジが重複する複数のセルを管理し、
前記第1無線基地局が、前記複数のセルのそれぞれの前記第1ハンドオーバ数と、前記複数のセルのそれぞれの前記第2ハンドオーバ数とをカウントし、
前記第1無線基地局が、前記複数のセルのそれぞれの前記第1ハンドオーバ数と、前記複数のセルそれぞれの前記第2ハンドオーバ数とを前記第2無線基地局又は前記保守運用装置に通知し、
前記第2無線基地局又は前記保守運用装置が、前記第1ハンドオーバ数と、前記第2ハンドオーバ数と、前記複数のセルの負荷状況とに基づいて、前記複数のセルの中から電源をオフするセルを決定する請求項1に記載の通信制御方法。 - 前記第1無線基地局が、前記所定の期間を示す情報を、前記第1ハンドオーバ数及び前記第2ハンドオーバ数と共に前記第2無線基地局又は前記保守運用装置に通知する請求項1に記載の通信制御方法。
- 前記第1ハンドオーバ数が、ハンドオーバ元セルごとにカウントされ、
前記第2ハンドオーバ数が、ハンドオーバ先セルごとにカウントされる請求項1に記載の通信制御方法。 - 前記第2無線基地局又は前記保守運用装置が、前記複数のセルへのハンドオーバの予測数と前記複数セルの負荷状況とに基づき、前記複数のセルの中から電源をオフにするセルを決定し、
前記ハンドオーバの予測数が、前記第1ハンドオーバ数と、前記第2ハンドオーバ数と、前記複数のセルの近隣セルの負荷状況とに基づき推測される請求項4に記載の通信制御方法。 - 第1無線基地局が、自局が管理するセルへのハンドオーバ数である第1ハンドオーバ数と、前記セルからのハンドオーバ数である第2ハンドオーバ数とを所定の期間においてカウントし、
前記第1無線基地局が、前記第1ハンドオーバ数と、前記第2ハンドオーバ数と、前記セルの負荷状況と、前記セルの周辺セルの負荷状況とに基づいて、前記セルの電源をオフにするか否かを決定し、
前記第1無線基地局が、前記セルの電源をオフする場合、前記セルの電源をオフすることを第2無線基地局又は保守運用装置に通知する通信制御方法。 - 前記第1無線基地局が、前記セルの電源をオフする場合、前記セルの電源をオフすることに加えて、前記第1ハンドオーバ数と、前記第2ハンドオーバ数と、前記セルの負荷状況とを前記第2無線基地局又は前記保守運用装置にさらに通知する請求項7に記載の通信制御方法。
- 前記第1無線基地局が、少なくとも一部のカバレッジが重複する複数のセルを管理し、
前記第1無線基地局が、前記複数のセルのそれぞれの前記第1ハンドオーバ数と、前記複数のセルのそれぞれの前記第2ハンドオーバ数とをカウントし、
前記第1無線基地局が、前記複数のセルのそれぞれの前記第1ハンドオーバ数と、前記複数のセルのそれぞれの前記第2ハンドオーバ数と、前記複数のセルの負荷状況と、前記複数のセルの周辺セルの負荷状況とに基づいて、前記複数のセルの中からオフするセルを少なくとも1つ決定し、
前記第1無線基地局が、前記決定したセルを示す情報を前記第2無線基地局又は前記保守運用装置に通知する請求項7に記載の通信制御方法。 - 前記第1無線基地局が、前記決定したセルを示す情報に加えて、前記第1ハンドオーバ数及び前記第2ハンドオーバ数を前記第2無線基地局又は前記保守運用装置にさらに通知する請求項9に記載の通信制御方法。
- 前記第2無線基地局又は前記保守運用装置が、前記セルの電源をオフすることを許可する旨を示すメッセージ又は電源をオフすることを許可しない旨を示すメッセージを送信する請求項7に記載の通信制御方法。
- 前記第1無線基地局が、前記第1ハンドオーバ数及び前記第2ハンドオーバ数に加えて、前記所定の期間を示す情報を前記第2無線基地局又は前記保守運用装置にさらに通知する請求項8に記載の通信制御方法。
- 前記第1無線基地局が、前記所定の期間におけるハンドオーバの予測数と、前記複数のセルの負荷状況とに基づき、前記複数のセルの中から電源をオフにするセルを決定し、
前記ハンドオーバの予測数が、前記第1ハンドオーバ数と、前記第2ハンドオーバ数と、前記複数のセルの近隣セルの負荷状況とに基づき推測される請求項9に記載の通信制御方法。 - 自局が管理するセルへのハンドオーバ数である第1ハンドオーバ数と、前記セルからのハンドオーバ数である第2ハンドオーバ数とを所定の期間においてカウントする制御部を備え、
前記制御部は、前記第1ハンドオーバ数及び前記第2ハンドオーバ数を、第2無線基地局又は保守運用装置に通知する無線基地局。 - 自局が管理するセルへのハンドオーバ数である第1ハンドオーバ数と、前記セルからのハンドオーバ数である第2ハンドオーバ数とを所定の期間においてカウントする制御部を備え、
前記制御部は、前記第1ハンドオーバ数と、前記第2ハンドオーバ数と、前記セルの負荷状況と、前記セルの周辺セルの負荷状況とに基づいて、前記セルの電源をオフにするか否かを決定し、
前記制御部は、前記セルの電源をオフする場合には、前記第1ハンドオーバ数と、前記第2ハンドオーバ数と、前記セルの負荷状況とを、第2無線基地局又は保守運用装置に通知する無線基地局。
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