WO2014024851A1 - Base station in mobile communications system and data transfer method - Google Patents

Base station in mobile communications system and data transfer method Download PDF

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Publication number
WO2014024851A1
WO2014024851A1 PCT/JP2013/071175 JP2013071175W WO2014024851A1 WO 2014024851 A1 WO2014024851 A1 WO 2014024851A1 JP 2013071175 W JP2013071175 W JP 2013071175W WO 2014024851 A1 WO2014024851 A1 WO 2014024851A1
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Prior art keywords
transfer
base station
data
address
source
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PCT/JP2013/071175
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French (fr)
Japanese (ja)
Inventor
匠吾 矢葺
明人 花木
義夫 伊賀上
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株式会社 エヌ・ティ・ティ・ドコモ
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Publication of WO2014024851A1 publication Critical patent/WO2014024851A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off

Definitions

  • the disclosed invention relates to a base station and a data transfer method in a mobile communication system.
  • a handover source base station (source base station ( S-eNB)) transmits data not yet transmitted to the user apparatus (UE) and data that has not received an acknowledgment signal (ACK) from the user apparatus (UE) as a handover destination base station (target base station (T -eNB)).
  • source base station S-eNB
  • ACK acknowledgment signal
  • target base station T -eNB
  • T-eNB target base station
  • the target base station (T-eNB) sets the data transfer destination address (ADDR T ) in response to a handover request from the source base station (S-eNB). eNB), and thereafter, the source base station (S-eNB) transfers data to the destination address (ADDR T ).
  • the transfer destination address (ADDR T ) is released and can be used for another data transfer.
  • Conventional handover is disclosed in Non-Patent Document 1-3.
  • 3GPP TS23.401 (5.5.1 Intra-E-UTRAN handover)
  • 3GPP TS36.413 (8.4.2 Handover Resource Allocation)
  • 3GPP TS35.423 (8.2.1 Handover Preparation)
  • the source base station (S-eNB) does not promptly inform the source base station (S-eNB) that the forwarding address (ADDR T ) has been released due to network congestion or communication failure, the source base station (S-eNB ) May still send some data to the forwarding address (ADDR T ).
  • the target base station (T-eNB) releases the transfer destination address (ADDR T ) and then uses the transfer source address (ADDR T ) for data transfer from another source base station (S-eNB ′).
  • the target base station (T-eNB) will receive transfer data not only from another source base station (S-eNB '), but also from the former source base station (S-eNB). All data is transferred to the user equipment (UE). However, transfer data from the former source base station (S-eNB ′) is unnecessary for this user apparatus (UE). Such useless data transfer should not be performed from the viewpoint of effective use of radio resources and reduction of processing load associated with data transmission / reception.
  • the subject of the disclosed invention is that when a hard handover is performed between a source base station (S-eNB) and a target base station (T-eNB), the target base station (T-eNB) is a user equipment (UE) It is at least alleviating the problem of transferring unnecessary data.
  • S-eNB source base station
  • T-eNB target base station
  • UE user equipment
  • a base station is An address management unit that extracts a data transfer source address from a handover request message received from a source base station, issues a transfer destination address corresponding to the transfer source address, and manages a correspondence relationship between the transfer source address and the transfer destination address
  • a network communication unit for notifying the source base station of the transfer destination address by a handover request confirmation message, and receiving transfer data from the source base station at the transfer destination address;
  • a wireless communication unit that transfers transfer data determined to be transferred to the user apparatus.
  • the target base station (T-eNB) is a user equipment (UE). At least the problem of transferring unnecessary data can be reduced.
  • the flowchart which shows the operation example of a base station.
  • FIG. 1 shows an outline of a system used in the embodiment.
  • User equipment User Equipment: UE
  • UE User Equipment
  • eNB evolved NodeB
  • the user apparatus UE
  • LTE Long Term Evolution
  • E-UTRAN Evolved NodeB
  • the system is a Long Term Evolution (LTE) or E-UTRAN mobile communication system, but the disclosed invention is suitable for performing a hard handover such as LTE Advanced. It may be used for a mobile communication system.
  • LTE Long Term Evolution
  • E-UTRAN E-UTRAN
  • a base station that manages a handover source cell is referred to as a source base station (S-eNB), and a base station that manages a handover destination cell is a target base station (T-eNB).
  • S-eNB source base station
  • T-eNB target base station
  • handover between base stations is assumed, but ⁇ 5.
  • the handover may be a handover between switching stations or a handover between an LTE system and a third generation system (3G system).
  • the source base station (S-eNB) When hard handover is performed between the source base station (S-eNB) and the target base station (T-eNB), the source base station (S-eNB) transmits data to be transferred to the user equipment (UE) to the GTP- It transmits to a target base station (T-eNB) via a U path.
  • Data to be transferred to the user apparatus (UE) is data that has not yet been transmitted from the source base station (S-eNB) and data that has been transmitted but has not been acknowledged (ACK).
  • the target base station (T-eNB) transfers the data received from the source base station (S-eNB) to the user apparatus (UE).
  • FIG. 2 shows a functional block diagram of the base stations (S-eNB and T-eNB) shown in FIG.
  • FIG. 2 shows various processing units or functional units included in the base station that are particularly relevant to the embodiment.
  • the base station includes at least a control unit 21, a radio interface 22, a network interface 23, an HO processing unit 24, an address management unit 25, a data storage unit 26, and a condition determination unit 27.
  • the control unit 21 controls the operation of various processing units in the base station.
  • the wireless interface 22 performs processing for transmitting and receiving signals to and from the user equipment (UE).
  • UE user equipment
  • the network interface 23 performs processing for transmitting and receiving signals to and from communication nodes in the network such as other base stations and switching stations (Mobility Management Entity: MME).
  • MME Mobility Management Entity
  • the HO processing unit 24 performs processing related to handover.
  • the base station is the source base station (S-eNB)
  • the HO processing unit 24 is a HO request that is a message for requesting a handover in response to a measurement report message received from the user apparatus (UE). Create a message.
  • the HO processing unit 24 includes the data transfer source address (ADDR S ) in the HO request message.
  • the HO processing unit 24 extracts the transfer destination address (ADDR T ) from the HO request ACK message that is a response to the HO request message.
  • the transfer destination address (ADDR T ) is used as a destination when transferring data to the target base station (T-eNB).
  • the HO processing unit 24 creates an RRC connection reconfiguration message to be notified to the user apparatus (UE).
  • the base station is the target base station (T-eNB)
  • the HO processing unit 24 creates an HO request ACK message that is a response to the HO request message.
  • the HO request ACK message includes the transfer destination address (ADDR T ).
  • the transfer source address (ADDR S ) may be any appropriate address indicating the transfer source when the source base station (S-eNB) transfers data, but is preferably an IP address of the Internet protocol (IP).
  • the transfer destination address (ADDR T ) may be any appropriate address indicating the transfer destination when the target base station (T-eNB) receives data, but is preferably an IP address.
  • the address management unit 25 extracts the data transfer source address (ADDR S ) from the received HO request message, issues the transfer destination address (ADDR T ) corresponding to the transfer source address (ADDR S ), and transfers the transfer source address (ADDR S ).
  • ADDR S ) and transfer destination address (ADDR T ) are managed.
  • the address management unit 25 sends the transfer source address (ADDR S ) and the transfer destination address (ADDR T ) And the transfer destination address (ADDR T ) can be used for other data transfer.
  • the data storage unit 26 stores data to be transferred to the user apparatus (UE).
  • the data transferred to the user equipment (UE) includes not only the transfer data received from the source base station (S-eNB) but also the data received from the switching center (MME).
  • condition determination unit 27 determines whether the data should be transferred to the user apparatus (UE). Specifically, the condition judging unit 27 refers to the correspondence relationship between the transfer source address (ADDR S ) and the transfer destination address (ADDR T ), and the transfer source address (ADDR S ) of the received transfer data is the transfer destination address. Whether data transfer is possible is determined according to whether it is associated with (ADDR T ).
  • FIG. 3 shows a flowchart of a data transfer method performed by the target base station (T-eNB) shown in FIG. 1 when a handover is performed. The flow begins at step 31 and proceeds to step 32.
  • the target base station (T-eNB) receives an HO request message, which is a message for requesting handover, from the source base station (S-eNB).
  • the HO request message includes a transfer source address (ADDR S ) when the source base station (S-eNB) transfers data to the target base station (T-eNB).
  • ADDR S transfer source address
  • step 33 the target base station (T-eNB) pays out a transfer destination address (ADDR T ) as a destination when the source base station (S-eNB) transfers data.
  • the target base station (T-eNB) stores the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR S ).
  • the target base station (T-eNB) transmits an HO request ACK message to the source base station (S-eNB) as a response to the HO request message.
  • the HO request ACK message includes a transfer destination address (ADDR T ).
  • the target base station (T-eNB) receives data to be transferred to the user apparatus (UE) from the source base station (S-eNB).
  • the data to be transferred is data that has not yet been transmitted from the source base station (S-eNB) and data that has been transmitted but whose acknowledgment signal (ACK) has not yet been confirmed.
  • the target base station determines whether or not to transfer the transfer data (data received as data to be transferred) received at the transfer destination address (ADDR T ) to the user equipment (UE). . This determination is based on whether the transfer destination address (ADDR T ) when the transfer data is received and the transfer source address (ADDR S ) of the received transfer data are defined in the correspondence stored in step 33 or not. Based on. If it is defined in the correspondence relationship, data transfer is permitted, but if it is not defined in the correspondence relationship, data transfer is not permitted.
  • step 37 the target base station (T-eNB) transfers the received transfer data to the user apparatus (UE).
  • step 38 the target base station (T-eNB) discards the received transfer data.
  • step 37 and step 38 the flow proceeds to step 39 and ends.
  • FIG. 4 shows an operation example when handover is performed in the system shown in FIG. In the target base station (T-eNB), the operation described in FIG. 3 is performed.
  • T-eNB target base station
  • step 401 the user equipment (UE OLD ) transmits a measurement report message to the source base station (S OLD -eNB) to notify that handover is necessary.
  • the source base station (S OLD -eNB) notifies the target base station (T-eNB) that a handover is necessary by using an HO request message.
  • the HO request message includes a transfer source address (ADDR OLD ) in data transfer.
  • step 405 the target base station (T-eNB) pays out a transfer destination address (ADDR T ) that is a destination when the source base station (S OLD -eNB) transfers data.
  • the target base station (T-eNB) stores the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ).
  • the target base station (T-eNB) transmits an HO request ACK message to the source base station (S OLD -eNB) as a response to the HO request message.
  • the HO request ACK message includes a transfer destination address (ADDR T ).
  • the source base station sends an RRC connection reconfiguration message to the user equipment (UE) to establish a radio link between the user equipment (UE OLD ) and the target base station (T-eNB).
  • UE user equipment
  • T-eNB target base station
  • the user apparatus UE OLD
  • T-eNB target base station
  • step 411 the user apparatus (UE OLD ) notifies the target base station (T-eNB) of an RRC connection reconfiguration completion message indicating that establishment of the radio link is completed.
  • the target base station (T-eNB) receives transfer data to be transferred to the user apparatus (UE OLD ) from the source base station (S OLD -eNB).
  • the data to be transferred is data that has not yet been transmitted from the source base station (S OLD -eNB) and data that has been transmitted but has not yet been acknowledged (ACK).
  • the target base station determines whether or not the transfer data received at the transfer destination address (ADDR T ) should be transferred to the user apparatus (UE OLD ). This determination is based on whether or not the transfer destination address (ADDR T ) when the transfer data is received and the transfer source address (ADDR OLD ) of the received transfer data are defined in the correspondence stored in step 405. Based on. If it is defined in the correspondence relationship, data transfer is permitted, but if it is not defined in the correspondence relationship, data transfer is not permitted. In the case of the current example, since the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) is defined, data transfer is performed.
  • step 417 the target base station (T-eNB) transfers the received transfer data to the user apparatus (UE OLD ).
  • the target base station (T-eNB) determines that the data received from the source base station (S OLD -eNB) has been transferred to the user equipment (UE OLD ), and the transfer destination address (ADDR T ) is released. Specifically, the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) is deleted.
  • the target base station (T-eNB) notifies the source base station (S OLD -eNB) of a message indicating that the transfer destination address (ADDR T ) has been released. Thereafter, the target base station (T-eNB) can use the transfer destination address (ADDR T ) for another data transfer.
  • another user apparatus needs a handover, and a procedure similar to the procedure from Step 401 to Step 417 is performed using another user apparatus (UE NEW ) and another source base station ( S NEW -eNB).
  • UE NEW another user apparatus
  • S NEW -eNB another source base station
  • the user equipment and the source base station are “different”, for the sake of simplicity of explanation, “another user equipment (UE NEW )” and “another source base station (S NEW -eNB ) "Is used.
  • step 421 another user apparatus (UE NEW ) transmits a measurement report message to another source base station (S NEW -eNB) to notify that handover is necessary.
  • S NEW -eNB another source base station
  • step 423 another source base station (S NEW -eNB) notifies the target base station (T-eNB) that the handover is necessary by an HO request message.
  • the HO request message includes a transfer source address (ADDR NEW ) in data transfer.
  • the target base station (T-eNB) can pay out ADDR T as a transfer destination address that is a destination when another source base station (S NEW -eNB) transfers data. This is because the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) with respect to the former source base station (S OLD -eNB) has been deleted.
  • the target base station (T-eNB) stores the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR NEW ).
  • the target base station transmits an HO request ACK message to another source base station (S NEW -eNB) as a response to the HO request message.
  • the HO request ACK message includes a transfer destination address (ADDR T ).
  • step 429 another source base station (S NEW -eNB) sends an RRC connection reconfiguration message to establish a radio link between another user equipment (UE NEW ) and the target base station (T-eNB). Notify another user equipment (UE NEW ).
  • another user apparatus (UE NEW ) establishes a radio link with the target base station (T-eNB) in response to this.
  • step 431 another user apparatus (UE NEW ) notifies the target base station (T-eNB) of an RRC connection reconfiguration completion message indicating that establishment of the radio link is completed.
  • the target base station (T-eNB) receives transfer data to be transferred to another user apparatus (UE NEW ) from another source base station (S NEW -eNB).
  • the target base station determines whether or not the transfer data received at the transfer destination address (ADDR T ) should be transferred to another user apparatus (UE NEW ). This determination is based on whether or not the transfer destination address (ADDR T ) when the transfer data is received and the transfer source address (ADDR NEW ) of the received transfer data are defined in the correspondence stored in step 425. Based on. If it is defined in the correspondence relationship, data transfer is permitted, but if it is not defined in the correspondence relationship, data transfer is not permitted. In the case of the present example, since the correspondence between the transfer destination address (ADDR T ) and the transfer source address (ADDR NEW ) is defined, data transfer is permitted.
  • step 437 the target base station (T-eNB) transfers the received transfer data to another user apparatus (UE NEW ).
  • UE NEW another user apparatus
  • step 441 some data is transferred from the source address (ADDR OLD ) of the former source base station (S OLD -eNB) to the destination address (ADDR T ) of the target base station (T-eNB). May be transferred to. This data is to be transferred to the former user apparatus (UE OLD ) and is not data to be transferred to the current user apparatus (UE NEW ).
  • the transfer source of data received at the transfer destination address (ADDR T ) could not be identified. In this case, all data received at the transfer destination address (ADDR T ) is transferred to the current user equipment (UE NEW ). Will be. However, in the embodiment, in Step 443, the target base station (T-eNB) transfers the transfer data received at the transfer destination address (ADDR T ) from the transfer source address (ADDR OLD ) to another user apparatus (UE NEW ). Determine whether or not to transfer. In the case of the current example, the correspondence between the transfer destination address (ADDR T ) and the transfer source address (ADDR NEW ) is specified, but the correspondence between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) The relationship is not specified. Therefore, the data from the former transfer source address (ADDR OLD ) is not transferred to another user apparatus (UE NEW ), and the received transfer data is discarded in step 445.
  • the disclosed invention is not limited to handover between base stations, but can also be applied to handover between switching centers (MME), or applicable to handover between LTE systems and 3G systems.
  • MME switching centers
  • Fig. 5 shows the outline of the system used in the modified example.
  • the user apparatus performs handover from the migration source cell managed by the source base station (S-eNB) to the migration destination cell managed by the target base station (T-eNB).
  • the switching station Mobility Management Entity: MME
  • the source base station (S-eNB) is connected to the source switching center (S-MME) through the S1 interface.
  • the target base station (T-eNB) is also connected to the target exchange (T-MME) through the S1 interface.
  • the source base station (S-eNB) and target base station (T-eNB) cannot directly transmit and receive signals, but the source switching center (S-MME) and target switching station (T-MME) Can send and receive directly.
  • FIG. 6 shows an operation example when handover is performed in the modification shown in FIG.
  • a procedure similar to the procedure described in FIG. 4 is executed, but communication between the source base station (S-eNB) and the target base station (T-eNB) It is different in that it is done through.
  • S-eNB source base station
  • T-eNB target base station
  • step 601 the user equipment (UE) transmits a measurement report message to the source base station (S-eNB) to notify that handover is necessary.
  • S-eNB source base station
  • the source base station (S-eNB) notifies the switching base station (S-MNB) on the source base station (S-eNB) side using the HO required message that the handover is necessary.
  • the target base station (T-MME) After transferring the message from the source base station (S-eNB) side switching station (S-MME) to the target base station (T-eNB) side switching station (T-MME), the target base station (T-MNB)
  • the switching center (T-MME) on the eNB) side notifies the target base station (T-eNB) by an HO request message.
  • the HO required message and the HO request message include a transfer source address (ADDR S ) in data transfer.
  • ADDR S transfer source address
  • step 605 the target base station (T-eNB) pays out a transfer destination address (ADDR T ) that is a destination when the source base station (S-eNB) transfers data.
  • the target base station (T-eNB) stores the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR S ).
  • the target base station (T-eNB) transmits a HO request ACK message to the target base station (T-eNB) side switching station (T-MME) as a response to the HO request message, and the target base station (
  • the exchange (T-MME) on the T-eNB side transfers the message to the exchange (S-MME) on the source base station (S-eNB) side, and then exchanges on the source base station (S-eNB) side.
  • the station (S-MME) transmits a handover command (HO command) to the source base station (S-eNB).
  • the HO request ACK message and the HO command include a transfer destination address (ADDR T ).
  • step 609 the source base station (S-eNB) sends an RRC connection reconfiguration message to the user equipment (UE) in order to establish a radio link between the user equipment (UE) and the target base station (T-eNB). Notice. Although not shown, in response to this, the user apparatus (UE) establishes a radio link with the target base station (T-eNB).
  • step 611 the user apparatus (UE) notifies the target base station (T-eNB) of an RRC connection reconfiguration completion message indicating that the establishment of the radio link is completed.
  • the target base station receives data to be transferred to the user apparatus (UE) from the source base station (S-eNB).
  • the target base station determines whether or not the transfer data received at the transfer destination address (ADDR T ) should be transferred to the user apparatus (UE). This determination is based on whether the transfer destination address (ADDR T ) when the transfer data is received and the transfer source address (ADDR S ) of the received transfer data are defined in the correspondence stored in step 605 or not. Based on. If it is defined in the correspondence, data transfer is permitted (step 617). If it is not defined in the correspondence, data transfer is not permitted and discarded (step 619).
  • the disclosed invention is not limited to such an embodiment, and those skilled in the art understand various modifications, modifications, alternatives, replacements, and the like. Will do.
  • the disclosed invention may be used in any suitable mobile communication system that performs hard handover.
  • specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified.
  • the classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may apply to the matters described in (as long as there is no conflict).
  • the boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries.
  • the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
  • the base station has been described using a functional block diagram, but such a device may be implemented in hardware, software, or a combination thereof.
  • Software operating in accordance with the present invention includes random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable It may be stored in any storage medium.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

A base station comprising: an address management unit that extracts a data transfer source address from a handover request message received from a source base station, delivers a transfer destination address corresponding to said transfer source address, and manages the correspondence relationship between the transfer source address and the transfer destination address; a network communications unit that notifies the source base station of the transfer destination address by using a handover request confirmation message, and receives transfer data from the source base station, in the transfer destination address; a conditions determination unit that browses the correspondence relationship and determines whether or not to transfer the received transfer data to a user device, in accordance with whether or not the transfer source address for the received transfer data corresponds to the transfer destination address; and a wireless communications unit that transfers transfer data for which a determination to transfer has been made, to the user device.

Description

移動通信システムにおける基地局及びデータ転送方法Base station and data transfer method in mobile communication system
　開示される発明は移動通信システムにおける基地局及びデータ転送方法等に関連する。 The disclosed invention relates to a base station and a data transfer method in a mobile communication system.
　ロングタームエボリューション(LTE：Long Term Evolution)方式の移動通信システムにおいて、ユーザ装置(UE)が通信中に接続している基地局を切り替えるハンドオーバが行われる場合、ハンドオーバ元の基地局(ソース基地局(S-eNB))は、ユーザ装置(UE)に未送信のデータ及び、ユーザ装置(UE)からの肯定応答信号(ACK)を受信できていないデータをハンドオーバ先の基地局(ターゲット基地局(T-eNB))へ送信する。ハンドオーバが成功し、ユーザ装置(UE)がターゲット基地局(T-eNB)と通信を開始した後、ターゲット基地局(T-eNB)はソース基地局(S-eNB)から受信したデータをユーザ装置(UE)へ転送する。これを可能にするため、ターゲット基地局(T-eNB)は、ソース基地局(S-eNB)からのハンドオーバの要求に応じて、データの転送先アドレス(ADDRT)をソース基地局(S-eNB)に通知し、以後、ソース基地局(S-eNB)はその転送先アドレス(ADDRT)宛にデータを転送する。データの転送は完了した、とターゲット基地局(T-eNB)が判断すると、転送先アドレス(ADDRT)は解放され、別のデータ転送に使用可能になる。従来のハンドオーバについては非特許文献1-3に開示されている。 In a Long Term Evolution (LTE) mobile communication system, when handover is performed to switch a base station to which a user apparatus (UE) is connected during communication, a handover source base station (source base station ( S-eNB)) transmits data not yet transmitted to the user apparatus (UE) and data that has not received an acknowledgment signal (ACK) from the user apparatus (UE) as a handover destination base station (target base station (T -eNB)). After the handover is successful and the user apparatus (UE) starts communication with the target base station (T-eNB), the target base station (T-eNB) receives the data received from the source base station (S-eNB). Transfer to (UE). In order to enable this, the target base station (T-eNB) sets the data transfer destination address (ADDR T ) in response to a handover request from the source base station (S-eNB). eNB), and thereafter, the source base station (S-eNB) transfers data to the destination address (ADDR T ). When the target base station (T-eNB) determines that the data transfer is complete, the transfer destination address (ADDR T ) is released and can be used for another data transfer. Conventional handover is disclosed in Non-Patent Document 1-3.
　しかしながら、ネットワークの輻輳や通信障害等に起因して、転送先アドレス(ADDRT)は解放されたことがソース基地局(S-eNB)に速やかに伝わらなかった場合、ソース基地局(S-eNB)は何らかのデータを依然として転送先アドレス(ADDRT)宛に送信するかもしれない。ターゲット基地局(T-eNB)は、その転送先アドレス(ADDRT)を解放した後、その転送元アドレス(ADDRT)を別のソース基地局(S-eNB’)からのデータ転送に使用することに決めていたとする。この場合、ターゲット基地局(T-eNB)は、別のソース基地局(S-eNB’)からだけでなく、かつてのソース基地局(S-eNB)からも転送データを受信することとなり、それら全てのデータがユーザ装置(UE)に転送される。しかしながら、このユーザ装置(UE)にとって、かつてのソース基地局(S-eNB’)からの転送データは不要である。無線リソースの有効利用及びデータの送受信に伴う処理負担の軽減等の観点から、このような無駄なデータ転送は行われるべきでない。 However, if the source base station (S-eNB) does not promptly inform the source base station (S-eNB) that the forwarding address (ADDR T ) has been released due to network congestion or communication failure, the source base station (S-eNB ) May still send some data to the forwarding address (ADDR T ). The target base station (T-eNB) releases the transfer destination address (ADDR T ) and then uses the transfer source address (ADDR T ) for data transfer from another source base station (S-eNB ′). Suppose you decide. In this case, the target base station (T-eNB) will receive transfer data not only from another source base station (S-eNB '), but also from the former source base station (S-eNB). All data is transferred to the user equipment (UE). However, transfer data from the former source base station (S-eNB ′) is unnecessary for this user apparatus (UE). Such useless data transfer should not be performed from the viewpoint of effective use of radio resources and reduction of processing load associated with data transmission / reception.
　開示される発明の課題は、ソース基地局(S-eNB)及びターゲット基地局(T-eNB)の間でハードハンドオーバが行われる場合において、ターゲット基地局(T-eNB)がユーザ装置(UE)に不要なデータを転送してしまう問題を少なくとも軽減することである。 The subject of the disclosed invention is that when a hard handover is performed between a source base station (S-eNB) and a target base station (T-eNB), the target base station (T-eNB) is a user equipment (UE) It is at least alleviating the problem of transferring unnecessary data.
　開示される発明による基地局は、
　ソース基地局から受信したハンドオーバ要求メッセージからデータの転送元アドレスを抽出し、前記転送元アドレスに対応する転送先アドレスを払い出し、前記転送元アドレス及び前記転送先アドレスの対応関係を管理するアドレス管理部と、
　ハンドオーバ要求確認メッセージにより前記転送先アドレスを前記ソース基地局に通知し、前記転送先アドレスにおいて、前記ソース基地局から転送データを受信するネットワーク通信部と、
　前記対応関係を参照し、受信した転送データの転送元アドレスが前記転送先アドレスに対応付けられているか否かに応じて、前記受信した転送データをユーザ装置へ転送するか否かを判断する条件判断部と、
　転送することに決定された転送データを前記ユーザ装置へ転送する無線通信部と
　を有する基地局である。 A base station according to the disclosed invention is
An address management unit that extracts a data transfer source address from a handover request message received from a source base station, issues a transfer destination address corresponding to the transfer source address, and manages a correspondence relationship between the transfer source address and the transfer destination address When,
A network communication unit for notifying the source base station of the transfer destination address by a handover request confirmation message, and receiving transfer data from the source base station at the transfer destination address;
A condition for determining whether to transfer the received transfer data to the user apparatus according to whether the transfer source address of the received transfer data is associated with the transfer destination address with reference to the correspondence relationship A determination unit;
And a wireless communication unit that transfers transfer data determined to be transferred to the user apparatus.
　開示される発明によれば、ソース基地局(S-eNB)及びターゲット基地局(T-eNB)の間でハードハンドオーバが行われる場合において、ターゲット基地局(T-eNB)がユーザ装置(UE)に不要なデータを転送してしまう問題を少なくとも軽減できる。 According to the disclosed invention, when a hard handover is performed between a source base station (S-eNB) and a target base station (T-eNB), the target base station (T-eNB) is a user equipment (UE). At least the problem of transferring unnecessary data can be reduced.
実施の形態で使用されるシステム例を示す図。The figure which shows the example of a system used by embodiment. 実施の形態で使用される基地局の機能ブロック図。The functional block diagram of the base station used by embodiment. 基地局の動作例を示すフローチャート。The flowchart which shows the operation example of a base station. ハンドオーバの際にシステムで行われるシーケンスを示す図。The figure which shows the sequence performed with a system in the case of a hand-over. 実施の形態で使用される別のシステム例を示す図。The figure which shows another example of a system used by embodiment. ハンドオーバの際にシステムで行われるシーケンスを示す図。The figure which shows the sequence performed with a system in the case of a hand-over.
　添付図面を参照しながら以下の観点から実施形態を説明する。図中、同様な要素には同じ参照番号又は参照符号が付されている。 Embodiments will be described from the following viewpoints with reference to the accompanying drawings. In the figures, similar elements are given the same reference numbers or reference signs.
　1．システム
　2．基地局
　3．ターゲット基地局(T-eNB)の動作例
　4．ハンドオーバにおけるシステムの動作例
　5．変形例(MME間ハンドオーバ)
　これらの項目の区分けは本発明に本質的ではなく、2以上の項目に記載された事項が必要に応じて組み合わせて使用されてよいし、ある項目に記載された事項が、別の項目に記載された事項に(矛盾しない限り)適用されてよい。 1． System 2. Base station 3. 3. Example of target base station (T-eNB) operation 4. Example of system operation in handover Modified example (handover between MMEs)
The classification of these items is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be described in another item. May be applied (as long as there is no conflict).
　＜1．システム＞
　図1は実施の形態で使用されるシステムの概略を示す。ユーザ装置(User　Equipment：UE)は基地局(evolved　NodeB：eNB)が管理するセルの中で無線通信を行うことができる。ユーザ装置(UE)はハンドオーバによりセルを変更することで移動通信を行うことができる。説明の便宜上、システムはロングタームエボリューション(Long　Term　Evolution：LTE)又はE-UTRAN方式の移動通信システムであるとするが、開示される発明はLTEアドバンスト方式等のようなハードハンドオーバを行う適切な如何なる移動通信システムに使用されてもよい。図示されているように、ハンドオーバの移行元セルを管理する基地局はソース基地局(S-eNB)と言及され、ハンドオーバの移行先セルを管理する基地局はターゲット基地局(T-eNB)と言及される。図示の例では基地局間のハンドオーバが想定されているが、＜5．変形例(MME間ハンドオーバ)＞において説明するように、ハンドオーバは交換局間のハンドオーバでもよいし、あるいはLTEシステムと第3世代方式のシステム(3Gシステム)との間のハンドオーバでもよい。 <1. System>
FIG. 1 shows an outline of a system used in the embodiment. User equipment (User Equipment: UE) can perform wireless communication in a cell managed by a base station (evolved NodeB: eNB). The user apparatus (UE) can perform mobile communication by changing a cell by handover. For convenience of explanation, it is assumed that the system is a Long Term Evolution (LTE) or E-UTRAN mobile communication system, but the disclosed invention is suitable for performing a hard handover such as LTE Advanced. It may be used for a mobile communication system. As shown in the figure, a base station that manages a handover source cell is referred to as a source base station (S-eNB), and a base station that manages a handover destination cell is a target base station (T-eNB). To be mentioned. In the illustrated example, handover between base stations is assumed, but <5. As described in Modification (Handover between MMEs)>, the handover may be a handover between switching stations or a handover between an LTE system and a third generation system (3G system).
　ソース基地局(S-eNB)及びターゲット基地局(T-eNB)の間でハードハンドオーバが行われる場合、ソース基地局(S-eNB)は、ユーザ装置(UE)に転送すべきデータをGTP-Uパスを介してターゲット基地局(T-eNB)へ送信する。ユーザ装置(UE)に転送すべきデータは、ソース基地局(S-eNB)から未だ送信されていないデータ及び送信されたが肯定応答(ACK)が確認できていないデータである。ターゲット基地局(T-eNB)はソース基地局(S-eNB)から受信したデータをユーザ装置(UE)へ転送する。 When hard handover is performed between the source base station (S-eNB) and the target base station (T-eNB), the source base station (S-eNB) transmits data to be transferred to the user equipment (UE) to the GTP- It transmits to a target base station (T-eNB) via a U path. Data to be transferred to the user apparatus (UE) is data that has not yet been transmitted from the source base station (S-eNB) and data that has been transmitted but has not been acknowledged (ACK). The target base station (T-eNB) transfers the data received from the source base station (S-eNB) to the user apparatus (UE).
　＜2．基地局＞
　図2は図1に示す基地局(S-eNB及びT-eNB)の機能ブロック図を示す。図2には基地局に備わる様々な処理部又は機能部のうち実施の形態に特に関連するものが示されている。基地局は、制御部21と、無線インターフェース22と、ネットワークインターフェース23と、HO処理部24と、アドレス管理部25と、データ保存部26と、条件判断部27とを少なくとも有する。 <2. Base station>
FIG. 2 shows a functional block diagram of the base stations (S-eNB and T-eNB) shown in FIG. FIG. 2 shows various processing units or functional units included in the base station that are particularly relevant to the embodiment. The base station includes at least a control unit 21, a radio interface 22, a network interface 23, an HO processing unit 24, an address management unit 25, a data storage unit 26, and a condition determination unit 27.
　制御部21は基地局における様々な処理部の動作を制御する。 The control unit 21 controls the operation of various processing units in the base station.
　無線インターフェース22は、ユーザ装置(UE)との間で信号を送受信するための処理を行う。 The wireless interface 22 performs processing for transmitting and receiving signals to and from the user equipment (UE).
　ネットワークインターフェース23は、他の基地局及び交換局(Mobility　Management　Entity：MME)等のようなネットワーク内の通信ノードとの間で信号を送受信するための処理を行う。 The network interface 23 performs processing for transmitting and receiving signals to and from communication nodes in the network such as other base stations and switching stations (Mobility Management Entity: MME).
　HO処理部24は、ハンドオーバに関する処理を行う。基地局がソース基地局(S-eNB)であった場合、HO処理部24は、ユーザ装置(UE)から受信したメジャーメントレポートのメッセージに応じて、ハンドオーバを要求するためのメッセージであるHOリクエストメッセージを作成する。従来とは異なり、HO処理部24は、データ転送の転送元アドレス(ADDRS)をHOリクエストメッセージに含める。HO処理部24は、HOリクエストメッセージに対する応答であるHOリクエストACKメッセージから、転送先アドレス(ADDRT)を抽出する。転送先アドレス(ADDRT)はターゲット基地局(T-eNB)へデータを転送する際の宛先として使用される。HO処理部24は、ユーザ装置(UE)に通知するRRCコネクション再設定(RRC　connection　reconfiguration)のメッセージを作成する。基地局がターゲット基地局(T-eNB)であった場合、HO処理部24は、HOリクエストメッセージに対する応答であるHOリクエストACKメッセージを作成する。HOリクエストACKメッセージには転送先アドレス(ADDRT)が含まれている。 The HO processing unit 24 performs processing related to handover. When the base station is the source base station (S-eNB), the HO processing unit 24 is a HO request that is a message for requesting a handover in response to a measurement report message received from the user apparatus (UE). Create a message. Unlike the prior art, the HO processing unit 24 includes the data transfer source address (ADDR S ) in the HO request message. The HO processing unit 24 extracts the transfer destination address (ADDR T ) from the HO request ACK message that is a response to the HO request message. The transfer destination address (ADDR T ) is used as a destination when transferring data to the target base station (T-eNB). The HO processing unit 24 creates an RRC connection reconfiguration message to be notified to the user apparatus (UE). When the base station is the target base station (T-eNB), the HO processing unit 24 creates an HO request ACK message that is a response to the HO request message. The HO request ACK message includes the transfer destination address (ADDR T ).
　なお、転送元アドレス(ADDRS)はソース基地局(S-eNB)がデータを転送する際の転送元を示す適切な如何なるアドレスでもよいが、インターネットプロトコル(IP)のIPアドレスであることが好ましい。同様に、転送先アドレス(ADDRT)も、ターゲット基地局(T-eNB)がデータを受信する際の転送先を示す適切な如何なるアドレスでもよいが、IPアドレスであることが好ましい。 The transfer source address (ADDR S ) may be any appropriate address indicating the transfer source when the source base station (S-eNB) transfers data, but is preferably an IP address of the Internet protocol (IP). . Similarly, the transfer destination address (ADDR T ) may be any appropriate address indicating the transfer destination when the target base station (T-eNB) receives data, but is preferably an IP address.
　アドレス管理部25は、受信したHOリクエストメッセージからデータの転送元アドレス(ADDRS)を抽出し、その転送元アドレス(ADDRS)に対応する転送先アドレス(ADDRT)を払い出し、転送元アドレス(ADDRS)及び転送先アドレス(ADDRT)の対応関係を管理する。ソース基地局(S-eNB)からターゲット基地局(T-eNB)へのデータ転送が完了したと判断された場合、アドレス管理部25は、転送元アドレス(ADDRS)及び転送先アドレス(ADDRT)の対応関係を解消し、その転送先アドレス(ADDRT)が他のデータ転送に使用できるようにする。 The address management unit 25 extracts the data transfer source address (ADDR S ) from the received HO request message, issues the transfer destination address (ADDR T ) corresponding to the transfer source address (ADDR S ), and transfers the transfer source address (ADDR S ). ADDR S ) and transfer destination address (ADDR T ) are managed. When it is determined that the data transfer from the source base station (S-eNB) to the target base station (T-eNB) has been completed, the address management unit 25 sends the transfer source address (ADDR S ) and the transfer destination address (ADDR T ) And the transfer destination address (ADDR T ) can be used for other data transfer.
　データ保存部26はユーザ装置(UE)に転送するデータを保存する。ユーザ装置(UE)に転送するデータは、ソース基地局(S-eNB)から受信した転送データだけでなく、交換局(MME)から受信したデータも含まれる。 The data storage unit 26 stores data to be transferred to the user apparatus (UE). The data transferred to the user equipment (UE) includes not only the transfer data received from the source base station (S-eNB) but also the data received from the switching center (MME).
　条件判断部27は、転送先アドレス(ADDRT)において何らかのデータを受信した場合、そのデータをユーザ装置(UE)に転送すべきか否かを判断する。具体的には、条件判断部27は、転送元アドレス(ADDRS)及び転送先アドレス(ADDRT)の対応関係を参照し、受信した転送データの転送元アドレス(ADDRS)がその転送先アドレス(ADDRT)に対応付けられているか否かに応じて、データ転送の可否を判断する。 When the condition determination unit 27 receives any data at the transfer destination address (ADDR T ), the condition determination unit 27 determines whether the data should be transferred to the user apparatus (UE). Specifically, the condition judging unit 27 refers to the correspondence relationship between the transfer source address (ADDR S ) and the transfer destination address (ADDR T ), and the transfer source address (ADDR S ) of the received transfer data is the transfer destination address. Whether data transfer is possible is determined according to whether it is associated with (ADDR T ).
　＜3．ターゲット基地局(T-eNB)の動作例＞
　図3は、ハンドオーバが行われる場合に、図1に示すターゲット基地局(T-eNB)が行うデータ転送方法のフローチャートを示す。フローはステップ31から始まり、ステップ32に進む。 <3. Example of target base station (T-eNB) operation>
FIG. 3 shows a flowchart of a data transfer method performed by the target base station (T-eNB) shown in FIG. 1 when a handover is performed. The flow begins at step 31 and proceeds to step 32.
　ステップ32において、ターゲット基地局(T-eNB)は、ハンドオーバを要求するためのメッセージであるHOリクエストメッセージをソース基地局(S-eNB)から受信する。HOリクエストメッセージは、従来とは異なり、ソース基地局(S-eNB)がターゲット基地局(T-eNB)にデータを転送する際の転送元アドレス(ADDRS)を含む。 In step 32, the target base station (T-eNB) receives an HO request message, which is a message for requesting handover, from the source base station (S-eNB). Unlike the conventional case, the HO request message includes a transfer source address (ADDR S ) when the source base station (S-eNB) transfers data to the target base station (T-eNB).
　ステップ33において、ターゲット基地局(T-eNB)は、ソース基地局(S-eNB)がデータを転送する際の宛先となる転送先アドレス(ADDRT)を払い出す。ターゲット基地局(T-eNB)は、転送先アドレス(ADDRT)及び転送元アドレス(ADDRS)の対応関係を記憶する。 In step 33, the target base station (T-eNB) pays out a transfer destination address (ADDR T ) as a destination when the source base station (S-eNB) transfers data. The target base station (T-eNB) stores the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR S ).
　ステップ34において、ターゲット基地局(T-eNB)は、HOリクエストメッセージに対する応答としてHOリクエストACKメッセージをソース基地局(S-eNB)に送信する。HOリクエストACKメッセージには、転送先アドレス(ADDRT)が含まれている。 In step 34, the target base station (T-eNB) transmits an HO request ACK message to the source base station (S-eNB) as a response to the HO request message. The HO request ACK message includes a transfer destination address (ADDR T ).
　ステップ35において、ターゲット基地局(T-eNB)は、ユーザ装置(UE)へ転送すべきデータをソース基地局(S-eNB)から受信する。転送すべきデータは、ソース基地局(S-eNB)から未だ送信されていないデータ及び送信されたが肯定応答信号(ACK)を未だ確認できていないデータである。 In step 35, the target base station (T-eNB) receives data to be transferred to the user apparatus (UE) from the source base station (S-eNB). The data to be transferred is data that has not yet been transmitted from the source base station (S-eNB) and data that has been transmitted but whose acknowledgment signal (ACK) has not yet been confirmed.
　ステップ36において、ターゲット基地局(T-eNB)は転送先アドレス(ADDRT)で受信した転送データ(転送すべきデータとして受信したデータ)をユーザ装置(UE)に転送すべきか否かを判断する。この判断は、転送データを受信した際の転送先アドレス(ADDRT)と、受信した転送データの転送元アドレス(ADDRS)とが、ステップ33で記憶した対応関係に規定されているか否かに基づいて行われる。対応関係に規定されていた場合、データ転送は許可されるが、対応関係に規定されていなかった場合、データ転送は許可されない。 In step 36, the target base station (T-eNB) determines whether or not to transfer the transfer data (data received as data to be transferred) received at the transfer destination address (ADDR T ) to the user equipment (UE). . This determination is based on whether the transfer destination address (ADDR T ) when the transfer data is received and the transfer source address (ADDR S ) of the received transfer data are defined in the correspondence stored in step 33 or not. Based on. If it is defined in the correspondence relationship, data transfer is permitted, but if it is not defined in the correspondence relationship, data transfer is not permitted.
　データ転送が許可される場合、ステップ37において、ターゲット基地局(T-eNB)は受信した転送データをユーザ装置(UE)に転送する。 If the data transfer is permitted, in step 37, the target base station (T-eNB) transfers the received transfer data to the user apparatus (UE).
　データ転送が許可されない場合、ステップ38において、ターゲット基地局(T-eNB)は受信した転送データを破棄する。 If the data transfer is not permitted, in step 38, the target base station (T-eNB) discards the received transfer data.
　ステップ37及びステップ38の後、フローはステップ39に進み、終了する。 After step 37 and step 38, the flow proceeds to step 39 and ends.
　このように転送先及び転送元アドレスの対応関係を規定し、ユーザ装置(UE)へのデータ転送の可否を対応関係に基づいて判断することで、ユーザ装置(UE)に不要なデータが転送されてしまう問題に効果的に対処できる。 In this way, by defining the correspondence between the transfer destination and the transfer source address, and determining whether data transfer to the user apparatus (UE) is possible based on the correspondence, unnecessary data is transferred to the user apparatus (UE). Can effectively deal with problems
　＜4．ハンドオーバにおけるシステムの動作例＞
　図4は図1に示すシステムにおいてハンドオーバが行われる場合の動作例を示す。ターゲット基地局(T-eNB)では図3で説明した動作が行われる。 <4. Example of system operation in handover>
FIG. 4 shows an operation example when handover is performed in the system shown in FIG. In the target base station (T-eNB), the operation described in FIG. 3 is performed.
　ステップ401において、ユーザ装置(UEOLD)は、ソース基地局(SOLD-eNB)にメジャーメントレポートのメッセージを送信し、ハンドオーバが必要であることを通知する。 In step 401, the user equipment (UE OLD ) transmits a measurement report message to the source base station (S OLD -eNB) to notify that handover is necessary.
　ステップ403において、ソース基地局(SOLD-eNB)は、ハンドオーバが必要であることをHOリクエストメッセージによりターゲット基地局(T-eNB)に通知する。従来とは異なり、HOリクエストメッセージは、データ転送における転送元アドレス(ADDROLD)を含む。 In step 403, the source base station (S OLD -eNB) notifies the target base station (T-eNB) that a handover is necessary by using an HO request message. Unlike the conventional case, the HO request message includes a transfer source address (ADDR OLD ) in data transfer.
　ステップ405において、ターゲット基地局(T-eNB)は、ソース基地局(SOLD-eNB)がデータを転送する際の宛先となる転送先アドレス(ADDRT)を払い出す。ターゲット基地局(T-eNB)は、転送先アドレス(ADDRT)及び転送元アドレス(ADDROLD)の対応関係を記憶する。 In step 405, the target base station (T-eNB) pays out a transfer destination address (ADDR T ) that is a destination when the source base station (S OLD -eNB) transfers data. The target base station (T-eNB) stores the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ).
　ステップ407において、ターゲット基地局(T-eNB)は、HOリクエストメッセージに対する応答としてHOリクエストACKメッセージをソース基地局(SOLD-eNB)に送信する。HOリクエストACKメッセージには、転送先アドレス(ADDRT)が含まれている。 In Step 407, the target base station (T-eNB) transmits an HO request ACK message to the source base station (S OLD -eNB) as a response to the HO request message. The HO request ACK message includes a transfer destination address (ADDR T ).
　ステップ409において、ソース基地局(SOLD-eNB)は、ユーザ装置(UEOLD)及びターゲット基地局(T-eNB)の間で無線リンクを確立するためにRRCコネクション再設定メッセージをユーザ装置(UEOLD)に通知する。図示されてはいないが、これに応じてユーザ装置(UEOLD)はターゲット基地局(T-eNB)との間で無線リンクを確立する。 In step 409, the source base station (S OLD -eNB) sends an RRC connection reconfiguration message to the user equipment (UE) to establish a radio link between the user equipment (UE OLD ) and the target base station (T-eNB). OLD ). Although not shown, in response to this, the user apparatus (UE OLD ) establishes a radio link with the target base station (T-eNB).
　ステップ411において、ユーザ装置(UEOLD)は、無線リンクの確立が完了したことを示すRRCコネクション再設定完了メッセージをターゲット基地局(T-eNB)に通知する。 In step 411, the user apparatus (UE OLD ) notifies the target base station (T-eNB) of an RRC connection reconfiguration completion message indicating that establishment of the radio link is completed.
　ステップ413において、ターゲット基地局(T-eNB)は、ユーザ装置(UEOLD)へ転送すべき転送データをソース基地局(SOLD-eNB)から受信する。転送すべきデータは、ソース基地局(SOLD-eNB)から未だ送信されていないデータ及び送信されたが肯定応答(ACK)を未だ確認できていないデータである。 In step 413, the target base station (T-eNB) receives transfer data to be transferred to the user apparatus (UE OLD ) from the source base station (S OLD -eNB). The data to be transferred is data that has not yet been transmitted from the source base station (S OLD -eNB) and data that has been transmitted but has not yet been acknowledged (ACK).
　ステップ415において、ターゲット基地局(T-eNB)は転送先アドレス(ADDRT)で受信した転送データをユーザ装置(UEOLD)に転送すべきか否かを判断する。この判断は、転送データを受信した際の転送先アドレス(ADDRT)と、受信した転送データの転送元アドレス(ADDROLD)とが、ステップ405で記憶した対応関係に規定されているか否かに基づいて行われる。対応関係に規定されていた場合、データ転送は許可されるが、対応関係に規定されていなかった場合、データ転送は許可されない。目下の例の場合、転送先アドレス(ADDRT)及び転送元アドレス(ADDROLD)の対応関係が規定されているので、データ転送が行われる。 In step 415, the target base station (T-eNB) determines whether or not the transfer data received at the transfer destination address (ADDR T ) should be transferred to the user apparatus (UE OLD ). This determination is based on whether or not the transfer destination address (ADDR T ) when the transfer data is received and the transfer source address (ADDR OLD ) of the received transfer data are defined in the correspondence stored in step 405. Based on. If it is defined in the correspondence relationship, data transfer is permitted, but if it is not defined in the correspondence relationship, data transfer is not permitted. In the case of the current example, since the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) is defined, data transfer is performed.
　ステップ417において、ターゲット基地局(T-eNB)は受信した転送データをユーザ装置(UEOLD)に転送する。 In step 417, the target base station (T-eNB) transfers the received transfer data to the user apparatus (UE OLD ).
　ステップ419において、ターゲット基地局(T-eNB)は、ソース基地局(SOLD-eNB)から受信したデータをユーザ装置(UEOLD)へ転送することが完了したと判断し、転送先アドレス(ADDRT)を解放する。具体的には、転送先アドレス(ADDRT)及び転送元アドレス(ADDROLD)の対応関係が削除される。ターゲット基地局(T-eNB)は、転送先アドレス(ADDRT)を解放したことを示すメッセージをソース基地局(SOLD-eNB)に通知する。以後、ターゲット基地局(T-eNB)は、転送先アドレス(ADDRT)を別のデータ転送に使用できる。図示の例の場合、別のユーザ装置(UENEW)がハンドオーバを必要としており、ステップ401からステップ417までの手順と同様な手順が、別のユーザ装置(UENEW)及び別のソース基地局(SNEW-eNB)に対して行われる。ユーザ装置やソース基地局が「別の」ものであることは必須ではないが、説明の簡明化のため、「別のユーザ装置(UENEW)」及び「別のソース基地局(SNEW-eNB)」が使用されている。 In step 419, the target base station (T-eNB) determines that the data received from the source base station (S OLD -eNB) has been transferred to the user equipment (UE OLD ), and the transfer destination address (ADDR T ) is released. Specifically, the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) is deleted. The target base station (T-eNB) notifies the source base station (S OLD -eNB) of a message indicating that the transfer destination address (ADDR T ) has been released. Thereafter, the target base station (T-eNB) can use the transfer destination address (ADDR T ) for another data transfer. In the case of the illustrated example, another user apparatus (UE NEW ) needs a handover, and a procedure similar to the procedure from Step 401 to Step 417 is performed using another user apparatus (UE NEW ) and another source base station ( S NEW -eNB). Although it is not essential that the user equipment and the source base station are “different”, for the sake of simplicity of explanation, “another user equipment (UE NEW )” and “another source base station (S NEW -eNB ) "Is used.
　ステップ421において、別のユーザ装置(UENEW)は、別のソース基地局(SNEW-eNB)にメジャーメントレポートのメッセージを送信し、ハンドオーバが必要であることを通知する。 In step 421, another user apparatus (UE NEW ) transmits a measurement report message to another source base station (S NEW -eNB) to notify that handover is necessary.
　ステップ423において、別のソース基地局(SNEW-eNB)は、ハンドオーバが必要であることをHOリクエストメッセージによりターゲット基地局(T-eNB)に通知する。従来とは異なり、HOリクエストメッセージは、データ転送における転送元アドレス(ADDRNEW)を含む。 In step 423, another source base station (S NEW -eNB) notifies the target base station (T-eNB) that the handover is necessary by an HO request message. Unlike the conventional case, the HO request message includes a transfer source address (ADDR NEW ) in data transfer.
　ステップ425において、ターゲット基地局(T-eNB)は、別のソース基地局(SNEW-eNB)がデータを転送する際の宛先となる転送先アドレスとして、ADDRTを払い出すことができる。かつてのソース基地局(SOLD-eNB)に対する転送先アドレス(ADDRT)及び転送元アドレス(ADDROLD)の対応関係は削除されているからである。ターゲット基地局(T-eNB)は、転送先アドレス(ADDRT)及び転送元アドレス(ADDRNEW)の対応関係を記憶する。 In step 425, the target base station (T-eNB) can pay out ADDR T as a transfer destination address that is a destination when another source base station (S NEW -eNB) transfers data. This is because the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) with respect to the former source base station (S OLD -eNB) has been deleted. The target base station (T-eNB) stores the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR NEW ).
　ステップ427において、ターゲット基地局(T-eNB)は、HOリクエストメッセージに対する応答としてHOリクエストACKメッセージを別のソース基地局(SNEW-eNB)に送信する。HOリクエストACKメッセージには、転送先アドレス(ADDRT)が含まれている。 In step 427, the target base station (T-eNB) transmits an HO request ACK message to another source base station (S NEW -eNB) as a response to the HO request message. The HO request ACK message includes a transfer destination address (ADDR T ).
　ステップ429において、別のソース基地局(SNEW-eNB)は、別のユーザ装置(UENEW)及びターゲット基地局(T-eNB)の間で無線リンクを確立するためにRRCコネクション再設定メッセージを別のユーザ装置(UENEW)に通知する。図示されてはいないが、これに応じて別のユーザ装置(UENEW)はターゲット基地局(T-eNB)との間で無線リンクを確立する。 In step 429, another source base station (S NEW -eNB) sends an RRC connection reconfiguration message to establish a radio link between another user equipment (UE NEW ) and the target base station (T-eNB). Notify another user equipment (UE NEW ). Although not shown, another user apparatus (UE NEW ) establishes a radio link with the target base station (T-eNB) in response to this.
　ステップ431において、別のユーザ装置(UENEW)は、無線リンクの確立が完了したことを示すRRCコネクション再設定完了メッセージをターゲット基地局(T-eNB)に通知する。 In step 431, another user apparatus (UE NEW ) notifies the target base station (T-eNB) of an RRC connection reconfiguration completion message indicating that establishment of the radio link is completed.
　ステップ433において、ターゲット基地局(T-eNB)は、別のユーザ装置(UENEW)へ転送すべき転送データを別のソース基地局(SNEW-eNB)から受信する。 In step 433, the target base station (T-eNB) receives transfer data to be transferred to another user apparatus (UE NEW ) from another source base station (S NEW -eNB).
　ステップ435において、ターゲット基地局(T-eNB)は転送先アドレス(ADDRT)で受信した転送データを別のユーザ装置(UENEW)に転送すべきか否かを判断する。この判断は、転送データを受信した際の転送先アドレス(ADDRT)と、受信した転送データの転送元アドレス(ADDRNEW)とが、ステップ425で記憶した対応関係に規定されているか否かに基づいて行われる。対応関係に規定されていた場合、データ転送は許可されるが、対応関係に規定されていなかった場合、データ転送は許可されない。目下の例の場合、転送先アドレス(ADDRT)及び転送元アドレス(ADDRNEW)の対応関係は規定されているので、データ転送は許可される。 In step 435, the target base station (T-eNB) determines whether or not the transfer data received at the transfer destination address (ADDR T ) should be transferred to another user apparatus (UE NEW ). This determination is based on whether or not the transfer destination address (ADDR T ) when the transfer data is received and the transfer source address (ADDR NEW ) of the received transfer data are defined in the correspondence stored in step 425. Based on. If it is defined in the correspondence relationship, data transfer is permitted, but if it is not defined in the correspondence relationship, data transfer is not permitted. In the case of the present example, since the correspondence between the transfer destination address (ADDR T ) and the transfer source address (ADDR NEW ) is defined, data transfer is permitted.
　ステップ437において、ターゲット基地局(T-eNB)は受信した転送データを別のユーザ装置(UENEW)に転送する。 In step 437, the target base station (T-eNB) transfers the received transfer data to another user apparatus (UE NEW ).
　ところで、転送先アドレス(ADDRT)を解放する旨の通知が、ネットワークの輻輳や通信障害等に起因して、かつてのソース基地局(SOLD-eNB)に適切に届かなかったとする。この場合、ソース基地局(SOLD-eNB)にとって、転送先アドレス(ADDRT)及び転送元アドレス(ADDROLD)の対応関係は解消されず、未だ有効である。このため、ステップ441に示すように、何らかのデータが、かつてのソース基地局(SOLD-eNB)の転送元アドレス(ADDROLD)からターゲット基地局(T-eNB)の転送先アドレス(ADDRT)へ転送されるおそれがある。このデータは、かつてのユーザ装置(UEOLD)に転送すべきものであり、現在のユーザ装置(UENEW)に転送すべきデータではない。 By the way, it is assumed that the notification of releasing the transfer destination address (ADDR T ) does not properly reach the former source base station (S OLD -eNB) due to network congestion or communication failure. In this case, for the source base station (S OLD -eNB), the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) is not canceled and is still valid. Therefore, as shown in step 441, some data is transferred from the source address (ADDR OLD ) of the former source base station (S OLD -eNB) to the destination address (ADDR T ) of the target base station (T-eNB). May be transferred to. This data is to be transferred to the former user apparatus (UE OLD ) and is not data to be transferred to the current user apparatus (UE NEW ).
　従来は、転送先アドレス(ADDRT)で受信したデータの転送元を識別できなかったので、この場合、転送先アドレス(ADDRT)で受信したデータはすべて現在のユーザ装置(UENEW)に転送されてしまう。しかしながら、実施の形態では、ステップ443において、ターゲット基地局(T-eNB)は転送元アドレス(ADDROLD)から転送先アドレス(ADDRT)で受信した転送データを別のユーザ装置(UENEW)に転送すべきか否かを判断する。目下の例の場合、転送先アドレス(ADDRT)と転送元アドレス(ADDRNEW)との対応関係は規定されているが、転送先アドレス(ADDRT)と転送元アドレス(ADDROLD)との対応関係は規定されていない。従ってかつての転送元アドレス(ADDROLD)からのデータは、別のユーザ装置(UENEW)へは転送されず、受信した転送データはステップ445において破棄される。 Previously, the transfer source of data received at the transfer destination address (ADDR T ) could not be identified. In this case, all data received at the transfer destination address (ADDR T ) is transferred to the current user equipment (UE NEW ). Will be. However, in the embodiment, in Step 443, the target base station (T-eNB) transfers the transfer data received at the transfer destination address (ADDR T ) from the transfer source address (ADDR OLD ) to another user apparatus (UE NEW ). Determine whether or not to transfer. In the case of the current example, the correspondence between the transfer destination address (ADDR T ) and the transfer source address (ADDR NEW ) is specified, but the correspondence between the transfer destination address (ADDR T ) and the transfer source address (ADDR OLD ) The relationship is not specified. Therefore, the data from the former transfer source address (ADDR OLD ) is not transferred to another user apparatus (UE NEW ), and the received transfer data is discarded in step 445.
　このように転送先及び転送元アドレスの対応関係を最新状態に更新することで、ユーザ装置(UE)へのデータ転送の可否を対応関係に基づいて判断でき、ユーザ装置(UE)に不要なデータが転送されてしまう従来の問題に効果的に対処できる。 In this way, by updating the correspondence relationship between the transfer destination and the transfer source address to the latest state, it is possible to determine whether or not data transfer to the user apparatus (UE) is possible based on the correspondence relation, and unnecessary data to the user apparatus (UE) It is possible to effectively deal with the conventional problem that is transferred.
　＜5．変形例(MME間ハンドオーバ)＞
　開示される発明は基地局間のハンドオーバに限定されず、交換局(MME)間のハンドオーバにも適用可能であるし、あるいはLTEシステムと3Gシステムとの間のハンドオーバにも適用可能である。 <5. Modified example (handover between MMEs)>
The disclosed invention is not limited to handover between base stations, but can also be applied to handover between switching centers (MME), or applicable to handover between LTE systems and 3G systems.
　図5は変形例で使用されるシステムの概略を示す。図1に示すシステムと同様に、ユーザ装置(UE)は、ソース基地局(S-eNB)が管理する移行元セルからターゲット基地局(T-eNB)が管理する移行先セルへハンドオーバする。図1に示す例とは異なり、このハンドオーバでは交換局(Mobility　Management　Entity：MME)が変更される。ソース基地局(S-eNB)はS1インターフェースを通じてソース交換局(S-MME)に接続されている。ターゲット基地局(T-eNB)もS1インターフェースを通じてターゲット交換局(T-MME)に接続されている。ソース基地局(S-eNB)及びターゲット基地局(T-eNB)は信号を直接的に送受信することはできないが、ソース交換局(S-MME)及びターゲット交換局(T-MME)は信号を直接的に送受信できる。 Fig. 5 shows the outline of the system used in the modified example. Similar to the system shown in FIG. 1, the user apparatus (UE) performs handover from the migration source cell managed by the source base station (S-eNB) to the migration destination cell managed by the target base station (T-eNB). Unlike the example shown in FIG. 1, the switching station (Mobility Management Entity: MME) is changed in this handover. The source base station (S-eNB) is connected to the source switching center (S-MME) through the S1 interface. The target base station (T-eNB) is also connected to the target exchange (T-MME) through the S1 interface. The source base station (S-eNB) and target base station (T-eNB) cannot directly transmit and receive signals, but the source switching center (S-MME) and target switching station (T-MME) Can send and receive directly.
　図6は図5に示す変形例においてハンドオーバが行われる場合の動作例を示す。概して図4で説明した手順と同様な手順が実行されるが、ソース基地局(S-eNB)及びターゲット基地局(T-eNB)間の通信が、交換局(S-MME及びT-MME)を介して行われる点が異なる。 FIG. 6 shows an operation example when handover is performed in the modification shown in FIG. In general, a procedure similar to the procedure described in FIG. 4 is executed, but communication between the source base station (S-eNB) and the target base station (T-eNB) It is different in that it is done through.
　ステップ601において、ユーザ装置(UE)は、ソース基地局(S-eNB)にメジャーメントレポートのメッセージを送信し、ハンドオーバが必要であることを通知する。 In step 601, the user equipment (UE) transmits a measurement report message to the source base station (S-eNB) to notify that handover is necessary.
　ステップ603において、ソース基地局(S-eNB)は、ハンドオーバが必要であることをHOリクワイアード(HO　Required)メッセージによりソース基地局(S-eNB)側の交換局(S-MME)に通知し、ソース基地局(S-eNB)側の交換局(S-MME)からターゲット基地局(T-eNB)側の交換局(T-MME)に当該メッセージを転送した後、ターゲット基地局(T-eNB)側の交換局(T-MME)がHOリクエスト(HO　Request)メッセージによりターゲット基地局(T-eNB)に通知する。従来とは異なり、HOリクワイアードメッセージ及びHOリクエストメッセージは、データ転送における転送元アドレス(ADDRS)を含む。 In step 603, the source base station (S-eNB) notifies the switching base station (S-MNB) on the source base station (S-eNB) side using the HO required message that the handover is necessary. , After transferring the message from the source base station (S-eNB) side switching station (S-MME) to the target base station (T-eNB) side switching station (T-MME), the target base station (T-MNB) The switching center (T-MME) on the eNB) side notifies the target base station (T-eNB) by an HO request message. Unlike the prior art, the HO required message and the HO request message include a transfer source address (ADDR S ) in data transfer.
　ステップ605において、ターゲット基地局(T-eNB)は、ソース基地局(S-eNB)がデータを転送する際の宛先となる転送先アドレス(ADDRT)を払い出す。ターゲット基地局(T-eNB)は、転送先アドレス(ADDRT)及び転送元アドレス(ADDRS)の対応関係を記憶する。 In step 605, the target base station (T-eNB) pays out a transfer destination address (ADDR T ) that is a destination when the source base station (S-eNB) transfers data. The target base station (T-eNB) stores the correspondence relationship between the transfer destination address (ADDR T ) and the transfer source address (ADDR S ).
　ステップ607において、ターゲット基地局(T-eNB)は、HOリクエストメッセージに対する応答としてHOリクエストACKメッセージをターゲット基地局(T-eNB)側の交換局(T-MME)に送信し、ターゲット基地局(T-eNB)側の交換局(T-MME)はソース基地局(S-eNB)側の交換局(S-MME)に当該メッセージを転送した後、ソース基地局(S-eNB)側の交換局(S-MME)はハンドオーバコマンド(HOコマンド)をソース基地局(S-eNB)に送信する。HOリクエストACKメッセージ及びHOコマンドには、転送先アドレス(ADDRT)が含まれている。 In step 607, the target base station (T-eNB) transmits a HO request ACK message to the target base station (T-eNB) side switching station (T-MME) as a response to the HO request message, and the target base station ( The exchange (T-MME) on the T-eNB side transfers the message to the exchange (S-MME) on the source base station (S-eNB) side, and then exchanges on the source base station (S-eNB) side. The station (S-MME) transmits a handover command (HO command) to the source base station (S-eNB). The HO request ACK message and the HO command include a transfer destination address (ADDR T ).
　ステップ609において、ソース基地局(S-eNB)は、ユーザ装置(UE)及びターゲット基地局(T-eNB)の間で無線リンクを確立するためにRRCコネクション再設定メッセージをユーザ装置(UE)に通知する。図示されてはいないが、これに応じてユーザ装置(UE)はターゲット基地局(T-eNB)との間で無線リンクを確立する。 In step 609, the source base station (S-eNB) sends an RRC connection reconfiguration message to the user equipment (UE) in order to establish a radio link between the user equipment (UE) and the target base station (T-eNB). Notice. Although not shown, in response to this, the user apparatus (UE) establishes a radio link with the target base station (T-eNB).
　ステップ611において、ユーザ装置(UE)は、無線リンクの確立が完了したことを示すRRCコネクション再設定完了メッセージをターゲット基地局(T-eNB)に通知する。 In step 611, the user apparatus (UE) notifies the target base station (T-eNB) of an RRC connection reconfiguration completion message indicating that the establishment of the radio link is completed.
　ステップ613において、ターゲット基地局(T-eNB)は、ユーザ装置(UE)へ転送すべきデータをソース基地局(S-eNB)から受信する。 In step 613, the target base station (T-eNB) receives data to be transferred to the user apparatus (UE) from the source base station (S-eNB).
　ステップ615において、ターゲット基地局(T-eNB)は転送先アドレス(ADDRT)で受信した転送データをユーザ装置(UE)に転送すべきか否かを判断する。この判断は、転送データを受信した際の転送先アドレス(ADDRT)と、受信した転送データの転送元アドレス(ADDRS)とが、ステップ605で記憶した対応関係に規定されているか否かに基づいて行われる。対応関係に規定されていた場合、データ転送は許可され(ステップ617)、対応関係に規定されていなかった場合、データ転送は許可されず、破棄される(ステップ619)。 In step 615, the target base station (T-eNB) determines whether or not the transfer data received at the transfer destination address (ADDR T ) should be transferred to the user apparatus (UE). This determination is based on whether the transfer destination address (ADDR T ) when the transfer data is received and the transfer source address (ADDR S ) of the received transfer data are defined in the correspondence stored in step 605 or not. Based on. If it is defined in the correspondence, data transfer is permitted (step 617). If it is not defined in the correspondence, data transfer is not permitted and discarded (step 619).
　以上、ハンドオーバにおけるデータ転送に関する実施の形態を説明してきたが、開示される発明はそのような実施形態に限定されず、当業者は様々な変形例、修正例、代替例、置換例等を理解するであろう。例えば開示される発明はハードハンドオーバを行う適切な如何なる移動通信システムに使用されてもよい。発明の理解を促すため具体的な数値例を用いて説明がなされたが、特に断りのない限り、それらの数値は単なる一例に過ぎず適切な如何なる値が使用されてもよい。上記の説明における項目の区分けは本発明に本質的ではなく、2以上の項目に記載された事項が必要に応じて組み合わせて使用されてよいし、ある項目に記載された事項が、別の項目に記載された事項に(矛盾しない限り)適用されてよい。機能ブロック図における機能部又は処理部の境界は必ずしも物理的な部品の境界に対応するとは限らない。複数の機能部の動作が物理的には1つの部品で行われてもよいし、あるいは1つの機能部の動作が物理的には複数の部品により行われてもよい。説明の便宜上、基地局は機能的なブロック図を用いて説明されたが、そのような装置はハードウェアで、ソフトウェアで又はそれらの組み合わせで実現されてもよい。本発明に従って動作するソフトウェアは、ランダムアクセスメモリ（RAM）、フラッシュメモリ、読み取り専用メモリ（ROM）、EPROM、EEPROM、レジスタ、ハードディスク（HDD）、リムーバブルディスク、CD－ROM、データベース、サーバその他の適切な如何なる記憶媒体に保存されてもよい。本発明は上記実施例に限定されず、本発明の精神から逸脱することなく、様々な変形例、修正例、代替例、置換例等が本発明に包含される。 As mentioned above, although the embodiment regarding the data transfer in the handover has been described, the disclosed invention is not limited to such an embodiment, and those skilled in the art understand various modifications, modifications, alternatives, replacements, and the like. Will do. For example, the disclosed invention may be used in any suitable mobile communication system that performs hard handover. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may apply to the matters described in (as long as there is no conflict). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. For convenience of explanation, the base station has been described using a functional block diagram, but such a device may be implemented in hardware, software, or a combination thereof. Software operating in accordance with the present invention includes random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable It may be stored in any storage medium. The present invention is not limited to the above embodiments, and various modifications, modifications, alternatives, substitutions, and the like are included in the present invention without departing from the spirit of the present invention.
　本国際特許出願は２０１２年８月８日に出願した日本国特許出願第２０１２－１７５８９４号に基づきその優先権を主張するものであり、日本国特許出願第２０１２－１７５８９４号の全内容を本願に援用する。 This international patent application claims priority based on Japanese Patent Application No. 2012-175894 filed on August 8, 2012. The entire contents of Japanese Patent Application No. 2012-175894 are incorporated herein by reference. Incorporate.
　S-eNB　ソース基地局
　T-eNB　ターゲット基地局
　21　制御部
　22　無線インターフェース
　23　ネットワークインターフェース
　24　HO処理部
　25　アドレス管理部
　26　データ保存部
　27　条件判断部 S-eNB Source base station T-eNB Target base station 21 Control unit 22 Wireless interface 23 Network interface 24 HO processing unit 25 Address management unit 26 Data storage unit 27 Condition judgment unit

Claims (7)

  1. 　ソース基地局から受信したハンドオーバ要求メッセージからデータの転送元アドレスを抽出し、前記転送元アドレスに対応する転送先アドレスを払い出し、前記転送元アドレス及び前記転送先アドレスの対応関係を管理するアドレス管理部と、
    　ハンドオーバ要求確認メッセージにより前記転送先アドレスを前記ソース基地局に通知し、前記転送先アドレスにおいて、前記ソース基地局から転送データを受信するネットワーク通信部と、
    　前記対応関係を参照し、受信した転送データの転送元アドレスが前記転送先アドレスに対応付けられているか否かに応じて、前記受信した転送データをユーザ装置へ転送するか否かを判断する条件判断部と、
    　転送することに決定された転送データを前記ユーザ装置へ転送する無線通信部と
    　を有する基地局。     An address management unit that extracts a data transfer source address from a handover request message received from a source base station, issues a transfer destination address corresponding to the transfer source address, and manages a correspondence relationship between the transfer source address and the transfer destination address When,
    A network communication unit for notifying the source base station of the transfer destination address by a handover request confirmation message, and receiving transfer data from the source base station at the transfer destination address;
    A condition for determining whether to transfer the received transfer data to the user apparatus according to whether the transfer source address of the received transfer data is associated with the transfer destination address with reference to the correspondence relationship A determination unit;
    A wireless communication unit configured to transfer transfer data determined to be transferred to the user apparatus.
  2. 　当該基地局がターゲット基地局として動作する場合に、前記ソース基地局から当該ターゲット基地局への転送データの転送が完了したと判断された場合、前記アドレス管理部は、前記転送元アドレス及び前記転送先アドレスの対応関係を解消し、前記転送先アドレスが他のデータ転送に使用できるようにする、請求項1記載の基地局。 When it is determined that the transfer of transfer data from the source base station to the target base station is completed when the base station operates as a target base station, the address management unit, the transfer source address and the transfer 2. The base station according to claim 1, wherein the correspondence relationship of the destination addresses is canceled so that the transfer destination address can be used for other data transfer.
  3. 　前記ハンドオーバ要求メッセージは、前記ソース基地局から交換局を経由せずに受信したハンドオーバ要求メッセージである、請求項1又は2に記載の基地局。 The base station according to claim 1 or 2, wherein the handover request message is a handover request message received from the source base station without passing through an exchange.
  4. 　前記ハンドオーバ要求メッセージは、前記ソース基地局から交換局を経由して受信したハンドオーバ要求メッセージである、請求項1又は2に記載の基地局。 The base station according to claim 1 or 2, wherein the handover request message is a handover request message received from the source base station via an exchange.
  5. 　前記転送元アドレス及び前記転送先アドレスがインターネットプロトコル(IP)のIPアドレスである、請求項1に記載の基地局。 The base station according to claim 1, wherein the transfer source address and the transfer destination address are IP addresses of an Internet protocol (IP).
  6. 　当該基地局がソース基地局として動作する場合に、前記転送元アドレスを含む前記ハンドオーバ要求メッセージをターゲット基地局に送信する、請求項1記載の基地局。 The base station according to claim 1, wherein, when the base station operates as a source base station, the handover request message including the transfer source address is transmitted to a target base station.
  7. 　基地局が実行するデータ転送方法であって、
    　ソース基地局から受信したハンドオーバ要求メッセージからデータの転送元アドレスを抽出し、前記転送元アドレスに対応する転送先アドレスを払い出し、前記転送元アドレス及び前記転送先アドレスの対応関係をアドレス管理部が管理するステップと、
    　ハンドオーバ要求確認メッセージにより前記転送先アドレスを前記ソース基地局に通知し、前記転送先アドレスにおいて、前記ソース基地局から転送データをネットワーク通信部が受信するステップと、
    　前記対応関係を参照し、受信した転送データの転送元アドレスが前記転送先アドレスに対応付けられているか否かに応じて、前記受信した転送データをユーザ装置へ転送するか否かを条件判断部が判断するステップと、
    　転送することに決定された転送データを前記ユーザ装置へ無線通信部が転送するステップと
    　を有するデータ転送方法。     A data transfer method executed by a base station,
    The data transfer source address is extracted from the handover request message received from the source base station, the transfer destination address corresponding to the transfer source address is issued, and the correspondence between the transfer source address and the transfer destination address is managed by the address management unit And steps to
    Notifying the source base station of the transfer destination address by a handover request confirmation message, and receiving the transfer data from the source base station at the transfer destination address;
    A condition determination unit that refers to the correspondence relationship and determines whether or not to transfer the received transfer data to the user apparatus according to whether or not a transfer source address of the received transfer data is associated with the transfer destination address. Steps to determine,
    A data transfer method comprising: a wireless communication unit transferring transfer data determined to be transferred to the user device.
PCT/JP2013/071175 2012-08-08 2013-08-05 Base station in mobile communications system and data transfer method WO2014024851A1 (en)

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