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WO2013136797A1 - Dispositif formant station de base radio, système de communication mobile lte et procédé de contrôle de la mobilité - Google Patents

Dispositif formant station de base radio, système de communication mobile lte et procédé de contrôle de la mobilité Download PDF

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Publication number
WO2013136797A1
WO2013136797A1 PCT/JP2013/001697 JP2013001697W WO2013136797A1 WO 2013136797 A1 WO2013136797 A1 WO 2013136797A1 JP 2013001697 W JP2013001697 W JP 2013001697W WO 2013136797 A1 WO2013136797 A1 WO 2013136797A1
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Prior art keywords
base station
handover
station apparatus
radio base
cell
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Ceased
Application number
PCT/JP2013/001697
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English (en)
Japanese (ja)
Inventor
犬丸　忠義
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NEC Corp
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NEC Corp
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Publication date
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Publication of WO2013136797A1 publication Critical patent/WO2013136797A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • 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

Definitions

  • the present invention relates to a radio base station apparatus, an LTE mobile communication system, and a mobility control method, and more particularly to a radio base station apparatus that performs handover control, an LTE mobile communication system, and a mobility control method.
  • LTE mobile communication system In a mobile communication system (hereinafter referred to as “LTE mobile communication system”) to which LTE (Long Term Evolution) is applied, when a communicating terminal moves across cells, it is possible to move while maintaining the communication state.
  • the handover control to perform is known.
  • the base station of the cell before movement (hereinafter referred to as “movement source base station”) determines the start of handover control, and sends control information to the base station of the movement destination cell (hereinafter referred to as “movement destination base station”). Notice.
  • the destination base station secures resources such as a communication band based on control information from the source base station, and performs handover control using the secured resources.
  • the handover control is defined in the following prior art documents.
  • a destination cell (hereinafter referred to as “handover destination cell”) can be determined using the status of the destination base station.
  • the cell before moving is referred to as a “handover source cell”.
  • LTE / 3GPP TS36.300 v10.4.0 2011-06 Technical Specification Group Radio Access Network
  • LTE / 3GPP TS36.331 v10.2.0 2011-06 Technical Specification Group Radio Access Network
  • Evolved Universal Terrestrial Radio Access (E-UTRA) Radio Resource Control (RRC) Protocol specific (Release 10) LTE / 3GPP TS36.413 v10.2.0 2011-06, Technical Specification Group Radio Access Network
  • S1 application protocol (S1AP) Release 10) LTE / 3GPP TS36.423 v10.2.0 2011-06, Technical Specification Group Radio Access Network
  • Evolved Universal Terrestrial Radio Access (E-UTRA) X2 application protocol (X2AP) (Release 10)
  • a general LTE mobile communication system may fail handover control. The reason will be described below.
  • the destination base station notifies the source base station of the state of the cell when the status of the cell providing the service changes, or notifies the load information at a cycle requested by the source base station. That is, the movement-destination base station notifies its own situation asynchronously with the handover control of the movement-source base station. For this reason, the source base station may start the handover control before the latest status is notified from the destination base station, and the handover control may fail. For example, even if the destination base station has a shortage of resources due to congestion or the like, the source base station before being notified of the situation determines that the destination base station can control handover, and performs handover Control will start. As a result, the source base station cannot secure resources in the destination base station, and handover control fails.
  • the LTE mobile communication system may fail in handover control because there is a possibility of performing handover control even in a situation where resources are insufficient in the destination base station.
  • An object of the present invention is to provide a radio base station apparatus, an LTE mobile communication system, and a mobility control method that solve the above problems.
  • a radio base station apparatus of the present invention is a radio base station apparatus of a handover source cell that performs handover control, and a resource that is secured in advance before performing the handover control, Resource securing means for notifying the radio base station apparatus of the handover destination cell of an identifier corresponding to the number of resources is provided.
  • a radio base station apparatus of the present invention is a radio base station apparatus of a handover destination cell that performs handover control, and prior to performing the handover control, the radio base station of the handover source cell Resource reservation execution means is provided for receiving a resource to be reserved in advance from an apparatus and an identifier corresponding to the number of the resources, and preallocating the resources corresponding to the identifier as resources for handover by the number of the resources.
  • the mobile communication system of the present invention is a mobile communication system that performs handover control, and the radio base station apparatus of the handover source cell secures in advance before performing the handover control.
  • Resource securing means for notifying the radio base station apparatus of the handover destination cell of a resource to be performed and an identifier corresponding to the number of the resources, and the radio base station apparatus of the handover destination cell performs handover before performing the handover control.
  • Resources to be reserved in advance from the radio base station apparatus of the original cell and identifiers corresponding to the number of the resources, and to reserve the resources corresponding to the identifiers in advance as resources for handover by the number of the resources A securing execution means is provided.
  • the radio base station apparatus of the handover source cell hands over the identifiers corresponding to the number of resources and the resources reserved in advance.
  • the LTE mobile communication system can reduce handover control failures and further reduce the network load between base stations.
  • FIG. 1 is a block diagram showing a configuration example of an LTE mobile communication system according to the first embodiment of the present invention.
  • the LTE mobile communication system in the first embodiment includes at least a source base station A 101, a destination base station B 102, and a terminal 103.
  • the source base station A 101 and the destination base station B 102 are connected to each other via a wired line, and the terminal 103 is connected to the source base station A 101 and the destination base station B 102 via a wireless line.
  • FIG. 2 is a diagram for explaining the operation (operation at the time of prior allocation) of the LTE mobile communication system according to the first embodiment of the present invention.
  • FIG. 3 is an example of information regarding resources that are to be reserved in advance in the movement-destination base station according to the first embodiment of the present invention.
  • FIG. 4 is a diagram for explaining the operation of the LTE mobile communication system (operation when performing handover using a pre-allocated resource) in the first embodiment of the present invention.
  • FIG. 5 is a diagram for explaining the operation of the LTE mobile communication system according to the first embodiment of the present invention (operation when performing handover without using a pre-allocated resource).
  • the source base station A101 performs an operation to confirm whether resources can be allocated in advance to the destination base station B102 prior to performing handover control. This operation will be described below with reference to FIG.
  • the source base station A 101 includes information 2202 regarding resources to be secured in advance in the destination base station B 102 (hereinafter referred to as “resource information to be secured in advance”) in the HANDOVER PREASSIGMENT REQUEST 2201, and the destination base station B 102 Send to.
  • HANDOVER PREASSIGMENT REQUEST 2201 is a message from the source base station A101 to the destination base station B102.
  • the resource information to be reserved in advance includes a resource ID indicating a resource to be reserved in advance, an ID indicating a handover destination cell to which a handover is to be performed, and the number of resources for which allocation is requested in advance.
  • an ID indicating a handover destination cell to be handed over is described as “ID of cell to be pre-allocated”, and the number of resources for which allocation is requested in advance is described as “number of allocated resources”.
  • the number of allocated resources is the number of predetermined communication bands, but is not limited thereto.
  • the resource to be allocated in advance may be a processing unit that performs baseband processing.
  • a predetermined communication band and resource information to be secured in advance are set in the source base station A 101 by the user of the present embodiment.
  • the source base station A 101 can also transmit resource information to be secured in advance in the X2-AP: HANDOVER REQUEST instead of the HANDOVER PREASSIGMENT REQUEST.
  • X2-AP: HANDOVER REQUEST is a known message notified from the source base station A 101 to the destination base station B 102 during handover control, and is defined in Non-Patent Document 4.
  • the destination base station B102 that has received the HANDOVER PREASSIGMENT REQUEST 2201 recognizes the resource to be secured in advance from the resource information to be secured in advance. If the resource to be secured can be allocated in advance, the movement-destination base station B102 secures the resource and responds to the movement-source base station A101 with HANDOVER PREASSIGMENT REQUEST ACKNOWLEDGE 2203.
  • HANDOVER PREASSIGMENT REQUEST ACKNOWLEDGE 2203 is a message indicating that allocation is possible.
  • the source base station A 101 and the destination base station B 102 store the total number of resources secured in advance (hereinafter referred to as “pre-assigned resources”) as pre-assignable resource values.
  • the source base station A 101 that has decided to start the handover uses the resource allocated in advance according to the priority of the terminal 103, that is, the pre-allocation It is determined whether to perform handover using resources.
  • the above-mentioned priority is determined using ARP (Allocation and Retention Priority) information, CQI (QoS Class Identifier) information, and the like of a bearer established for the terminal.
  • the source base station A 101 determines that the bearer whose delay permissible time recognized from the CQI is equal to or shorter than a predetermined permissible time is high priority in order to perform handover reliably.
  • the source base station A 101 determines that the terminal 103 that communicates with the high priority bearer uses the pre-allocated resource to perform handover.
  • the source base station A 101 that has decided to perform handover using the pre-assigned resource includes the resource ID 2302 in the X2-AP: HANDOVER REQUEST 2301 and the resource information 2303 used in the request, and sends it to the destination base station B 102.
  • X2-AP: HANDOVER REQUEST 2301 is a message specified in Non-Patent Document 4, and is a message that the source base station A101 requests handover to the destination base station B102.
  • the resource information 2303 described above is information used by the movement-destination base station B102 for performing handover. In order to cope with an unexpected service failure in the handover destination cell in real time, information necessary for the movement destination base station to extract the handover destination candidate cell in the X2-AP: HANDOVER REQUEST 2301 as described later. Can also be transmitted.
  • the movement-destination base station B102 receives the resource ID 2302 and the resource information 2303 used in the request.
  • the movement-destination base station B102 performs handover control on the resource indicated by the resource ID 2302 among the pre-allocation resources based on the resource information 2303 used in the request.
  • the movement-destination base station B102 notifies the movement-source base station A101 of the pre-allocable resource value obtained by subtracting the number of resources allocated by the handover control, using X2-AP: HANDOVER REQUEST ACKNOWLEDGE 2304.
  • X2-AP: HANDOVER REQUEST ACKNOWLEDGE 2304 is a response message to X2-AP: HANDOVER REQUEST 2301 and is defined in Non-Patent Document 4.
  • X2-AP: HANDOVER REQUEST ACKNOWLEDGE 2304 receives source base station A 101 and updates the pre-assignable resource value by subtracting the number of resources assigned by the handover control.
  • the source base station A 101 uses the RRC: RRC Connection Reconfiguration 2305 defined in Non-Patent Document 2 to continue the handover process.
  • the source base station A 101 that has decided to perform the handover without using the pre-allocated resource, obtains information 2402 necessary for the destination base station B 102 to extract the handover destination candidate cell, as X2-AP: HANDOVER REQUEST 2401. Include in and send.
  • FIG. 6 is an example of information 2402 necessary for extracting a handover destination candidate cell.
  • the movement-destination base station B102 receives X2-AP: HANDOVER REQUEST 2401, and determines whether or not handover to the handover-destination cell is possible. If the destination base station B102 determines that handover to the cell is impossible, for example, if resources cannot be secured, the destination base station B102 searches the neighboring cell list of the cell and recognizes the neighboring cell. The movement-destination base station B102 uses the information 2402 for extracting the handover-destination candidate cell among the recognized neighboring cells, and a list of cells that can become the handover-destination cell (hereinafter referred to as “handover-destination cell candidate list”) To extract. The operation of extracting the handover destination cell candidate list will be described below with reference to FIG.
  • the movement-destination base station B102 may or may not be within the area of the adjacent cell after a certain time. Determine whether. Then, the movement-destination base station B102 multiplies the reception quality / reception power of adjacent cells that may be in the area by a predetermined coefficient, and extracts adjacent cells that satisfy a predetermined threshold or more as a handover destination candidate list. .
  • the predetermined coefficient and the predetermined threshold are set in the movement-destination base station B102 by the user of the present embodiment.
  • the movement-destination base station B102 notifies the movement-source base station A101 that the handover destination cell candidate list 2404 and the requested handover to the handover destination cell are impossible. Further, the movement-destination base station B102 notifies the movement-source base station A101 of the reception quality and reception power of each neighboring cell listed in the handover-destination cell candidate list 2404 together with the handover-destination cell candidate list 2404.
  • the handover destination cell candidate list 2404 and the like to be notified to the source base station A101 can be included in the X2-AP: HANDOVER REQUEST ACKNOWLEDGE 2403 defined in Non-Patent Document 4 and notified.
  • the source base station A 101 that has received the handover destination cell candidate list 2404 recognizes the handover destination candidate cell from the handover destination cell candidate list 2404. If there is an appropriate cell among the handover destination candidate cells, the source base station A 101 recognizes that cell as the handover destination cell. For example, the source base station A 101 determines that there is an appropriate cell when there is a handover destination candidate cell that is equal to or higher than a predetermined value, has the best reception quality, or has the strongest reception power, and uses the handover destination candidate cell as the handover destination cell. Also good. Next, the source base station A 101 uses the RRC: RRC Connection Reconfiguration 2405 defined in Non-Patent Document 2 for the cell, and continuously performs a known handover process.
  • the source base station A 101 lists cells that have not been handed over in the list 2407 of cells that have not been handed over in the handover destination cell candidate list 2404.
  • the source base station A101 notifies the destination base station B102 of a list 2407 of cells that have not been handed over.
  • the list 2407 of cells that have not been handed over can also be notified by X2-AP: HANDOVER CANCEL 2406 defined in Non-Patent Document 4.
  • the LTE communication system can perform a handover to another cell in which no service failure or the like has occurred, and avoid a handover failure.
  • the host apparatus monitoring the destination base station B102 provides a service to the source base station A101 so that the source base station A101 can recognize that a service failure has occurred in the destination base station B102. You may make it notify generation
  • the above operations (1) to (5) can also be applied to an LTE mobile communication system supporting 3GPP Release 10, and similar effects can be expected. That is, the same effect can be expected by applying the above operations (1) to (5) to the carrier aggregation function.
  • FIG. 7 shows an example of information regarding resources that are to be reserved in advance in the destination base station in this case.
  • the LTE mobile communication system of the present embodiment can reduce handover control failures and further reduce the network load between base stations.
  • the reason why handover control failures are reduced is because the source base station reserves resources for handover in the destination base station in advance prior to handover control. Even if the movement-destination base station is in a congested state, handover control can be performed in a situation where resources are not insufficient, so that handover failures can be reduced. Moreover, the LTE mobile communication system of this Embodiment can prevent the generation
  • the LTE mobile communication system calculates a candidate cell for a handover destination even when a service failure or the like occurs at the destination base station and it is determined that handover is not acceptable at the destination base station. To do. As a result, the LTE mobile communication system according to the present embodiment can continue handover, reduce handover failures, and suppress network load between base stations.
  • the LTE mobile communication system reserves resources in advance in the target base station B102, but does not calculate the amount of resources to be secured in advance, and thus reserves many resources unnecessarily. There may be a problem.
  • FIG. 8 is a diagram for explaining the operation of the LTE mobile communication system (pre-allocation operation in the source base station) in the present embodiment.
  • a terminal 103 (hereinafter referred to as a UE) that has a call connection with the source base station A101 measures RSRP (Reference Signal Received Power) and RSRQ (Reference Signal Received Quality), and transmits it to the source base station A101. To do.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • Each UE may notify the source base station A101 by including RSRP or RSRQ in the Measurement Report 2204 that is a message from the UE to the source base station A101.
  • the source base station A 101 extracts a handover candidate UE by using RSRP or RSRQ received from each UE.
  • the handover candidate UE may be extracted by the following operation.
  • a UE in which the RSRP of the cell of the movement-source base station A101 is lower than a predetermined threshold and the RSRP of the cell of the movement-destination base station B102 is higher than the predetermined threshold is set as a handover candidate UE.
  • the source base station A101 calculates UEs whose resources should be secured in advance using the ARP value or CQI parameter among the extracted handover candidate UEs and the amount of resources (number of bearers and bandwidth). To do.
  • An example of the calculation procedure is shown below.
  • the source base station A101 acquires the capacity of the destination base station B102.
  • the source base station A 101 may acquire from the destination base station B 102 using an operator input or a protocol message such as RESOURCE STATUS UPDATE defined in Non-Patent Document 4.
  • the capacity may be, for example, the amount of free resources that are not used for call processing among all resources in the movement-destination base station B102.
  • the amount of resources is the number of bearers and the amount of bandwidth.
  • the source base station A 101 determines the amount of resources that should be pre-allocated to the destination base station B 102 from the capacity of the destination base station B 102 acquired in step 1.
  • a determination method a value obtained by multiplying a capacity by a weighting coefficient or an input value by an operator can be used. Further, this determination method may be determined in consideration of the congestion status of the movement-destination base station B102.
  • Procedure 3 The source base station A 101 extracts UEs assigned to the resource amount to be requested acquired in Procedure 2, that is, the number of bearers and the bandwidth amount, as target UEs in the order of ARP values with higher priority. Note that a UE that exceeds the ARP threshold set in advance in the source base station A101 without extracting the number of bearers to be requested and the bandwidth may be the target UE. Further, the bearer types to be requested may be limited using CQI.
  • the source base station A 101 determines whether there is a difference between the pre-assignable resource value and the value calculated by performing steps 1 to 3 after performing steps 1 to 3. If there is a difference, the source base station A 101 performs the HANDOVER PREASSIGMENT procedure shown in FIG. 2, that is, the above-described (1) pre-allocation operation to update the pre-assignable resource value, and the destination base station Resources for the amount of resources are reserved in advance in B102.
  • the source base station A101 can optimize resources reserved in advance at the destination base station B102 by periodically repeating the above-described operation shown in FIG. 8, and implement more efficient resource management. be able to.
  • the LTE mobile communication system according to the present embodiment can optimize resources to be secured in advance. The reason is that the LTE mobile communication system according to the present embodiment appropriately calculates the amount of resources that need to be secured in advance.
  • the configuration of the LTE mobile communication system according to the third embodiment of the present invention is the same as that of the LTE mobile communication system according to the first embodiment.
  • the radio base station apparatus of the handover source cell Prior to performing handover control, notifies the radio base station apparatus of the handover destination cell of resources to be reserved in advance and the number corresponding to the number of resources.
  • the radio base station apparatus of the handover destination cell Prior to performing handover control, the radio base station apparatus of the handover destination cell receives an identifier corresponding to the resource and the number of resources to be secured in advance from the radio base station apparatus of the handover source cell, and sets the resource corresponding to the identifier.
  • the number of resources is reserved in advance as resources for handover.
  • the LTE mobile communication system of the present embodiment can reduce handover control failures and further reduce the network load between base stations.
  • Source base station A 102 Destination base station B 103 terminal 2201 HANDOVER PREASSIGMENT REQUEST 2202 Information on resources to be secured in advance 2203 HANDOVER PREASSIGMENT REQUEST ACKNOWLEDGE 2204 Measurement Report 2301 HANDOVER REQUEST 2302 Resource ID 2303 Resource information used in the request 2304 HANDOVER REQUEST ACKNOWLEDGE 2305 RRC Connection Reconfiguration 2401 HANDOVER REQUEST 2402 Information for extracting handover destination candidate cell 2403 HANDOVER REQUEST ACKNOWLEDGE 2404 Handover destination cell candidate list 2405 RRC Connection Reconfiguration 2406 HANDOVER CANCEL 2407 List of cells not handed over

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PCT/JP2013/001697 2012-03-16 2013-03-14 Dispositif formant station de base radio, système de communication mobile lte et procédé de contrôle de la mobilité Ceased WO2013136797A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017191995A (ja) * 2016-04-12 2017-10-19 ソフトバンク株式会社 基地局及び移動通信システム
CN109792640A (zh) * 2016-09-10 2019-05-21 Lg 电子株式会社 在无线通信系统中预留用于执行v2x通信的有限数量资源的方法和使用该方法的终端

Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2011097443A (ja) * 2009-10-30 2011-05-12 Sony Corp ハンドオーバのための方法、端末装置、基地局及び無線通信システム
JP2012124972A (ja) * 2012-03-29 2012-06-28 Nec Corp 移動通信システム、ハンドオーバ制御方法、無線基地局及びプログラム

Patent Citations (2)

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JP2011097443A (ja) * 2009-10-30 2011-05-12 Sony Corp ハンドオーバのための方法、端末装置、基地局及び無線通信システム
JP2012124972A (ja) * 2012-03-29 2012-06-28 Nec Corp 移動通信システム、ハンドオーバ制御方法、無線基地局及びプログラム

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017191995A (ja) * 2016-04-12 2017-10-19 ソフトバンク株式会社 基地局及び移動通信システム
CN109792640A (zh) * 2016-09-10 2019-05-21 Lg 电子株式会社 在无线通信系统中预留用于执行v2x通信的有限数量资源的方法和使用该方法的终端
US11564072B2 (en) 2016-09-10 2023-01-24 Lg Electronics Inc. Method for selecting, in selection period, subframe excluding subframe relating to subframe in which transmission has been performed during sensing period in wireless communication system, and terminal using same
CN109792640B (zh) * 2016-09-10 2023-04-04 Lg 电子株式会社 在无线通信系统中预留用于执行v2x通信的有限数量资源的方法和使用该方法的终端
US12069550B2 (en) 2016-09-10 2024-08-20 Lg Electronics Inc. Method for selecting, in selection period, subframe excluding subframe relating to subframe in which transmission has been performed during sensing period in wireless communication system, and terminal using same

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