JP2013081041A - Mobile communication method, core network apparatus, and serving gateway apparatus - Google Patents

Abstract

Kind Code: A1 To avoid unnecessary "Downlink Data Notification" and "Paging" transmission in handover processing from an E-UTRAN cell of a UE to a UTRAN cell.
When a MME receives a “UE Context Release Request” including “Inter-RAT redirection”, the mobile communication method according to the present invention includes “Inter-RAT redirection” including “Inter-RAT redirection”. A step of transmitting a “Release Access Bearer Request”, and when the S-GW receives user data addressed to the UE after receiving the “Release Access Bearer Request”, the “Downlink Data Notification” is sent to the MME. And a step of not transmitting.
[Selection] Figure 4

Description

  The present invention relates to a mobile communication method, a core network device, and a serving gateway device.

  In FIG. 5, in a mobile communication system using LTE (Long Term Evolution), a UE (User Equipment, Mobile Station) E-UTRAN (Evolved Universal Radio Access Network) cell to a UTRAN (Universal Access Network). The operation when a handover is performed will be described.

  As shown in FIG. 5, in step S2001, the UE transmits “(RRC) Measurement Report (measurement report)” to the eNB (radio base station).

  In step S2002, when the eNB decides to perform a handover to the UTRAN cell of the UE based on the received “(RRC) Measurement Report”, the eNB notifies the mobile management node (MME) of “( S1-AP) UE Context Release Request ".

  In step S2003, the MME transmits “(GTPv2) Release Access Bearer Request” to the S-GW (Serving Gateway).

  In step S2004, the S-GW transmits “(GTPv2) Release Access Bearer Response” to the MME.

  As a result, in step S2005, switching from E-UTRAN to UTRAN is performed in the UE, and in step S2006, the S1 connection for the UE in the E-UTRAN is released.

3GPP TS 29.274

  Thereafter, as shown in FIG. 5, when the user data # 1 addressed to the UE is received in step S2007, the S-GW transmits “Downlink Data Notification” to the MME in step S2008, and in step S2009. The MME transmits “Paging (paging signal)” to the UE.

  However, since the UE has already completed switching to the UTRAN cell, such “Paging” does not reach the UE.

  Thereafter, the MME detects the expiration of the timer T3413 in step S2010, and transmits “(GTPv2) Downlink Data Notification Failure Indication” to the S-GW in step S2011.

  Therefore, the present invention has been made in view of the above-described problems, and avoids unnecessary transmission of “Downlink Data Notification” and “Paging” in the handover process from the E-UTRAN cell of the UE to the UTRAN cell. It is an object of the present invention to provide a mobile communication method, a core network device, and a serving gateway device that can perform communication.

  A first feature of the present invention is a mobile communication method, in which a radio communication network device of a first communication method determines that a mobile station performs handover to a cell of a second communication method. A step of transmitting a context release request signal including first change information indicating that to the core network device of the method, and when the core network device of the first communication method receives the context release request signal, A step of transmitting, to the serving gateway device, an access bearer release request signal including second change information indicating that the mobile station has decided to perform handover to the cell of the second communication method; and the serving gateway device Receives user data addressed to the mobile station after receiving the access bearer release request signal. The, the core network apparatus of the first communication scheme, and summarized in that a step that does not transmit the downlink data notification signal indicating that effect.

  A second feature of the present invention is a core network device of a first communication method, a receiving unit configured to receive a context release request signal from a radio access network device of the first communication method, When the context release request signal received by the receiving unit includes first change information indicating that the mobile station has decided to perform handover to the cell of the second communication method, to the serving gateway device And a transmission unit configured to transmit an access bearer release request signal including second change information indicating that the mobile station has decided to perform handover to the cell of the second communication method. This is the gist.

  A third feature of the present invention is a serving gateway device, which is configured to receive an access bearer release request signal from a core network device of the first communication method, and is received by the receiving unit. If the second change information indicating that the mobile station has decided to perform handover to the cell of the second communication method is included in the access bearer release request signal, user data addressed to the mobile station A transmission unit configured not to transmit a downlink data notification signal indicating that the user data addressed to the mobile station has been received to the core network device of the first communication method even when received. It is a summary to comprise.

  As described above, according to the present invention, a mobile communication method capable of avoiding useless transmission of “Downlink Data Notification” and “Paging” in the handover process from the UE E-UTRAN cell to the UTRAN cell, A core network device and a serving gateway device can be provided.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. It is a functional block diagram of MME concerning a 1st embodiment of the present invention. It is a functional block diagram of S-GW which concerns on the 1st Embodiment of this invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention. It is a sequence diagram which shows operation | movement of the conventional mobile communication system.

(Mobile communication system according to the first embodiment of the present invention)
A mobile communication system according to a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an LTE mobile communication system will be described as an example of the mobile communication system according to the present embodiment, but the present invention is also applicable to mobile communication systems other than the LTE system.

  As shown in FIG. 1, the mobile communication system according to the present embodiment includes an S-GW, an MME, an eNB in an E-UTRAN, an MSC (Mobile Switching Center) / SGSN (Serving GPRS Support Node, A packet switch), an RNC (Radio Network Controller) and a Node B (radio base station) in the UTRAN.

  As illustrated in FIG. 2, the MME includes a reception unit 11, a determination unit 12, and a transmission unit 13.

  The receiving unit 11 is configured to receive various signals from the eNB and the S-GW.

  For example, the receiving unit 11 is configured to receive “(S1-AP) UE Context Release Request” from the eNB, or to receive “(GTPv2) Release Access Bearer Response” from the MME.

  The determining unit 12 is configured to determine whether “Inter-RAT redirection” is included in the “(S1-AP) UE Context Release Request” received by the receiving unit 11.

  When the determination unit 12 determines that “Inter-RAT redirection” is included in the “(S1-AP) UE Context Release Request”, the transmission unit 13 performs “Inter-RAT” for the S-GW. “(GTPv2) Release Access Bearer Request” including “redirection” is transmitted.

  As illustrated in FIG. 3, the S-GW includes a reception unit 21, a determination unit 12, a storage unit 13, and a transmission unit 14.

  The receiving unit 21 is configured to receive various signals from the MME and the external network NW.

  For example, the receiving unit 21 is configured to receive “(GTPv2) Release Access Bearer Request” from the MME or to receive user data from the external network NW.

  The determination unit 22 is configured to determine whether “Inter-RAT redirection” is included in the “(GTPv2) Release Access Bearer Request” received by the reception unit 11.

  The transmission unit 24 is configured to transmit various signals, for example, “(GTPv2) Release Access Bearer Response” to the MME.

  Normally, when the receiving unit 21 receives user data addressed to the UE, the transmitting unit 24 is configured to transmit “Downlink Data Notification” to the MME.

  However, when the determination unit 12 determines that “Inter-RAT redirection” is included in the “(GTPv2) Release Access Bearer Request”, the reception unit 21 receives user data addressed to the UE. Even if it exists, the transmission part 24 is comprised so that "Downlink Data Notification" may be transmitted with respect to MME, and the memory | storage part 23 is comprised so that this user data may be buffered.

  Note that the storage unit 23 may be configured to delete buffered user data after a predetermined period has elapsed, for example, when a predetermined timer expires.

  Hereinafter, with reference to FIG. 4, an operation (Release with redirection procedure) in the case where handover from the E-UTRAN cell of the UE to the UTRAN cell is performed in the mobile communication system according to the present embodiment will be described.

  As illustrated in FIG. 4, in step S1001, the UE transmits “(RRC) Measurement Report” to the eNB.

  In Step S1002, when the eNB determines to perform a handover to the UTRAN cell of the UE based on the received “(RRC) Measurement Report”, the eNB includes “(Inter-RAT redirection)” including “Inter-RAT redirection”. -AP) UE Context Release Request ".

  In step S1003, when the MME determines that “Inter-RAT redirection” is included in the received “(S1-AP) UE Context Release Request”, the MME performs “Inter-RAT redirection” for the S-GW. “(GTPv2) Release Access Bearer Request” is transmitted.

  In step S1004, the S-GW transmits "(GTPv2) Release Access Bearer Response" to the MME.

  As a result, in step S1005, the UE switches from E-UTRAN to UTRAN, and in step S1006, the S1 connection for the UE in the E-UTRAN is released.

  After that, in step S1007, when the S-GW receives user data # 1 addressed to the UE, the “(GTPv2) Release Access Bearer Request” received in step S1003 includes “Inter-RAT redirection”. The user data # 1 addressed to the UE is buffered without transmitting “Downlink Data Notification” to the MME.

  According to the mobile communication system according to the present embodiment, when the S-GW determines that “Inter-RAT redirection” is included in the “(GTPv2) Release Access Bearer Request” received from the MME, the UE Even when the user data # 1 addressed is received, since “Downlink Data Notification” is not transmitted to the ME, it is possible to avoid useless transmission of “Downlink Data Notification”. Transmission of “Paging” can also be avoided.

  The characteristics of the present embodiment described above may be expressed as follows.

  A first feature of the present embodiment is a mobile communication method, in which an eNB (radio access network apparatus of a first communication scheme) performs a handover to a UTRAN (second communication scheme) cell of a UE (mobile station). If it is determined, “(S1-AP) UE Context Release Request (includes“ Inter-RAT redirection (first change information) ”indicating to the MME (core network device of the first communication method). When the MME receives “(S1-AP) UE Context Release Request” including “Inter-RAT redirection”, the S-GW (serving gateway device) , “Inter-RAT redirec "(GTPv2) Release Access Bearer Request (access bearer release request signal)" including "ion (second change information)" and S-GW includes "(GTPv2) Release including" Inter-RAT redirection ". A step of not transmitting a “Downlink Data Notification (downlink data notification signal)” indicating the fact to the MME when user data addressed to the UE is received after receiving the “Access Bearer Request”. The gist.

  A second feature of the present embodiment is an MME, which is received by the receiving unit 11 and the receiving unit 11 configured to receive “(S1-AP) UE Context Release Request” from the eNB. When “Inter-RAT redirection” is included in “(S1-AP) UE Context Release Request”, “(GTPv2) Release Access Bearer Request” including “Inter-RAT redirection” for S-GW The gist of the present invention is to include a transmission unit 13 configured to transmit.

  The third feature of the present embodiment is S-GW, which is received by the receiving unit 21 and the receiving unit 21 configured to receive “(GTPv2) Release Access Bearer Request” from the MME. When “Inter-RAT redirection” is included in “(GTPv2) Release Access Bearer Request”, even when user data addressed to the UE is received, “Downlink Data Notification” is sent to the MME. The gist of the present invention is that it includes a transmission unit 24 configured not to transmit.

  Note that the operations of the UE, eNB, MME, S-GW, and MSC / SGSN described above may be performed by hardware, may be performed by a software module executed by a processor, or may be a combination of both. May be implemented.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the UE, eNB, MME, S-GW, or MSC / SGSN. Further, the storage medium and the processor may be provided in the UE, eNB, MME, S-GW, and MSC / SGSN as discrete components.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

MME ... mobility management node MSC / SGSN ... exchange S-GW ... serving gateway device eNB ... radio base station UE ... mobile station 11, 21 ... receiving unit 12, 22 ... determining unit 13, 24 ... transmitting unit 23 ... storage unit

Claims (3)

When the radio access network apparatus of the first communication system decides to perform handover to the cell of the second communication system of the mobile station, the first change indicating that to the core network apparatus of the first communication system Transmitting a context release request signal including information;
When the core network device of the first communication method receives the context release request signal, it indicates to the serving gateway device that the mobile station has decided to perform handover to the cell of the second communication method Transmitting an access bearer release request signal including second change information;
When the serving gateway device receives user data addressed to the mobile station after receiving the access bearer release request signal, the downlink data indicating that to the core network device of the first communication method And a step of not transmitting the notification signal. A core network device of a first communication method,
A receiving unit configured to receive a context release request signal from the radio access network device of the first communication method;
When the context release request signal received by the receiving unit includes first change information indicating that the mobile station has decided to perform handover to the cell of the second communication method, to the serving gateway device And a transmission unit configured to transmit an access bearer release request signal including second change information indicating that the mobile station has decided to perform handover to the cell of the second communication method. A core network device characterized by that. A receiving unit configured to receive an access bearer release request signal from the core network device of the first communication method;
If the access bearer release request signal received by the receiving unit includes second change information indicating that the mobile station has decided to perform handover to the cell of the second communication scheme, Even when user data addressed to a station is received, a downlink data notification signal indicating that user data addressed to the mobile station has been received is not transmitted to the core network device of the first communication method. A serving gateway device.

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