JP5774926B2 - Mobile communication method - Google Patents

Description

  The present invention relates to a mobile communication method.

  In an EPC (Evolved Packet Core) network to which GTP (GPRS Tunneling Protocol) described in Non-Patent Document 1 is applied, “RA (Router Advertisement, Router Notification Signal)” is P-GW (PDN-Gateway, packet data). A network gateway device) is configured to notify a UE (User Equipment, mobile station).

  “RA” includes “IPv6 Prefix” to be allocated to the UE, “router lifetime” indicating the time during which the “IPv6 Prefix” is valid, and “default gateway information (packet transfer information)”.

  The UE is configured to update the validity of the IPv6 address held by the UE by periodically receiving “RA”.

  That is, when receiving the “RA”, the UE sets a “Router lifetime (predetermined timer)” based on the “router lifetime” included in the “RA” and the “default gateway” included in the “RA”. It is configured to hold “information”.

  Here, when the UE receives “RA” before the expiration of the “Router lifetime”, the UE updates the validity of the IPv6 address held based on the received “RA”, and the “default gateway”. It is configured to update "information".

  On the other hand, if the UE determines that the IPv6 address held by the UE is not valid, that is, if “RA” is not received before the “Router lifetime” expires, the UE deletes the “default gateway information” held. It is configured as follows.

  In other words, the UE retains “default gateway information” until “Router lifetime (for example, 18 hours)” notified by “RA” expires, and after “Router lifetime” expires, “default gateway”. It is configured to delete "information".

  Here, “Router lifetime” is a timer held by the UE, and as a default value, three times as long as “MaxRtrAdvInterval (network-side timer)” is defined (for example, refer to Non-Patent Document 2).

  “MaxRtrAdvInterval” is a timer (maximum RA transmission interval) held by the P-GW connected to the mobile station UE, and “21600 seconds (6 hours)” is defined as a default value (for example, Non-Patent Document 3).

  Similarly, in an EPC network to which PMIP (Proxy Mobile IP) described in Non-Patent Document 4 is applied, “RA” is notified from the S-GW (Serving Gateway, serving gateway device) to the UE. It is configured.

  Here, “MaxRtrAdvInterval” is a timer (maximum RA transmission interval) held by the S-GW connected to the UE, and “21600 seconds (6 hours)” is defined as a default value (for example, non- (See Patent Document 3).

3GPP TS 23.401 RFC4861 6.2.1 3GPP TS 29.061 3GPP TS 23.402

  In the conventional mobile communication system, the UE periodically (for example, every hour) makes a “Tracking Area Update (TAU) Request (location registration area update request) to the MME (Mobility Management Entity, mobility management node). Signal) ".

  Further, in the conventional mobile communication system, the UE is configured to transmit a “Service Request (service request signal)” to the MME when detecting a transmission trigger or an incoming trigger.

  Here, the conventional mobile communication system is configured such that the transmission of “RA” is performed independently from the case where the “location registration area update process” and the “service request procedure” are performed.

  Therefore, in the conventional mobile communication system, when such “location registration area update processing” or “service request procedure” is performed, even if the timing for transmitting “RA” has arrived, There is a problem in that “RA” is transmitted after setting a bearer different from the bearer related to “Area Update Processing” and “Service Request Procedure”, which is inefficient.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a mobile communication method capable of efficiently realizing “RA” transmission.

  A first feature of the present invention is a mobile communication method, in which a mobile station periodically transmits a location registration area update request signal to a mobility management node, and the mobility management node When the location registration area update request signal is received and when it is determined that it is necessary to transmit a notification signal for notifying information related to the IP address assigned to the mobile station, the mobile station and the radio base station A radio access bearer between the radio base station and the serving gateway device, and a request for the mobility management node to transmit the notification signal to the serving gateway device Transmitting a request signal to be transmitted, and the serving gateway device transmits the transfer via the bearer and the radio access bearer in response to the request signal. Against the station, and summarized in that a step of transmitting the notification signal.

  A second feature of the present invention is a mobile communication method in which a mobile station periodically transmits a location registration area update request signal to a mobility management node; When the location registration area update request signal is received and when it is determined that it is necessary to transmit a notification signal for notifying information related to the IP address assigned to the mobile station, the mobile station and the radio base station A radio access bearer between the radio base station and the serving gateway device, and a request for the mobility management node to transmit the notification signal to the serving gateway device A request signal to be transmitted, and the serving gateway device transmits the request signal to a packet data network gateway device The packet data network gateway device transmits the notification signal to the mobile station via the serving gateway device, the bearer, and the radio access bearer in response to the request signal; It is summarized as having.

  A third feature of the present invention is a mobile communication method in which a serving gateway device or a packet data network gateway device notifies information related to an IP address assigned to a mobile station when a service request procedure is performed. When it is determined that a signal needs to be transmitted, a radio access bearer between the mobile station and the radio base station set in the service request procedure and the radio base station and the serving are set for the mobile station. The gist is to have a step of transmitting the notification signal via a bearer with the gateway device.

  As described above, according to the present invention, it is possible to provide a mobile communication method capable of efficiently realizing “RA” transmission.

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

(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 FIG. 1 to FIG.

  As shown in FIG. 1, the mobile communication system according to this embodiment includes PCRF (Policy and Charging Rules Function, policy and charging rule server device), P-GW, S-GW, MME, eNB, HSS (Home Subscriber Server, subscriber management server) and the like.

  In the mobile communication system according to the present embodiment, PMIP may be applied between S-GW and P-GW, or GTP may be used.

  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 UE, eNB, S-GW, and the like.

  For example, the receiving unit 11 receives “TAU Request” from the UE, receives “(S1-AP) Initial Context Setup Response” from the eNB, and receives “Modify Bearer Response” from the S-GW. It is configured as follows.

  The determination unit 12 is configured to determine whether or not it is necessary to transmit “RA” to the UE when the reception unit 11 receives “TAU Request”.

  For example, the determination unit 12 is configured to determine that “RA” needs to be transmitted to the UE when “TAU Request” is received by the reception unit 11 a predetermined number of times (for example, 6 times). May be.

  Further, the determination unit 12 needs to transmit “RA” to the UE based on the transmission status of “RA” in the S-GW acquired at the time of signal exchange between the previous MME and the S-GW. It may be configured to determine whether or not.

  Here, the transmission status of “RA” in the S-GW may be information indicating an elapsed time since the last transmission of “RA”, a last transmission time of “RA”, and the like.

  Alternatively, the determination unit 12 determines whether the “RA” acquired at the time of signal exchange between the previous MME and the S-GW should be transmitted based on “RA” transmission necessity information, which is transmitted to the UE. Alternatively, it may be configured to determine whether or not it is necessary to transmit “RA”.

  Note that, when the “location registration area update process” is performed, the determination unit 12 performs “RA” on the UE regardless of whether or not the S-GW that manages the bearer for the UE has changed. Is determined as to whether or not it is necessary to transmit.

  The transmission unit 13 is configured to transmit various signals to the UE, eNB, S-GW, and the like.

  For example, the transmission unit 13 transmits “TAU Accept” to the UE, transmits “S1-AP Initial Context Setup Request” to the eNB, or transmits “Modify Bearer Request” to the S-GW. It is configured to transmit.

  Here, when the determination unit 12 determines that “RA” needs to be transmitted to the UE, the transmission unit 13 transmits “S1-AP Initial Context Setup Request” to the eNB, and S -It is configured to transmit a request signal requesting the GW to transmit "RA".

  Hereinafter, with reference to FIG. 3 to FIG. 5, an operation of transmitting “RA” to the UE in the UE location registration area update process in the mobile communication system according to the present embodiment will be described.

  As illustrated in FIG. 3, in step S1001, when the UE determines to start the TAU process, the UE transmits “TAU Request” to the MME via the eNB.

  In step S <b> 1002, when the reception unit 11 receives “TAU Request”, the MME determines whether it is necessary to transmit “RA” to the UE.

  When the MME determines that it is necessary to transmit “RA” to the UE, in step S1003, the S1 bearer for UE (between eNB and S-GW) and the radio access bearer (between UE and eNB). Setting process is started.

  Here, the setting process will be described with reference to FIGS. First, an example 1 of the setting process will be described with reference to FIG. 4, and secondly, an example 2 of the setting process will be described with reference to FIG.

  As shown in FIG. 4, in step S1103A, the MME transmits “S1-AP Initial Context Setup Request” including “TAU Accept” to the eNB. In step S1103B, the eNB “RRC Connection Reconfiguration” including “TAU Accept” is transmitted.

  For example, “TAU Accept” may be set in the information element “NAS-PDU” in “S1-AP Initial Context Setup Request”.

  Upon receiving “RRC Connection Reconfiguration” including “TAU Accept”, the UE transmits “RRC Connection Reconfiguration Complete” to the eNB in Step 1103C.

  In step S1103D, the eNB transmits “S1-AP Initial Context Setup Response” to the MME.

  In step S1103E, the UE transmits “RRC UL Information Transfer” including “TAU Complete” to the eNB, and in step S1103F, the eNB transmits “S1 Complete” including “TAU Complete” to the MME. -"AP Uplink NAS Transport".

  As illustrated in FIG. 5, in step S1203A, the MME transmits “S1-AP NAS Downlink NAS Transport” including “TAU Accept” to the eNB. In step S1203B, the eNB “RRC DL Information Transfer” including “TAU Accept” is transmitted.

  In step S1203C, the UE transmits “RRC UL Information Transfer” including “TAU Complete” to the eNB, and in step S1203D, the eNB transmits “S1-AP including“ TAU Complete ”to the MME. "Uplink NAS Transport" is transmitted.

  In step S1203E, the MME transmits “S1-AP Initial Context Setup Request” to the eNB, and in step S1203F, the eNB transmits “RRC Connection Reconfiguration” to the UE.

  Upon receiving “RRC Connection Reconfiguration”, the UE transmits “RRC Connection Reconfiguration Complete” to the eNB in Step 1203F.

  In Step S1203H, the eNB transmits “S1-AP Initial Context Setup Response” to the MME.

  Returning to FIG. 3, in step 1004, the MME transmits “Modify Bearer Request” including a request signal for requesting to transmit “RA” to the S-GW.

  Here, the MME may transmit the request signal to the S-GW using a signal other than “Modify Bearer Request”.

  When GTP is used between the S-GW and the P-GW, the S-GW transmits the request signal to the P-GW in step S1005, and the P-GW In response to this request signal, regardless of the value of “MaxRtrAdvInterval”, “Modify Bearer Response” is transmitted to the S-GW, and “RA” is transmitted to the UE via the S-GW. In step S1006, the S-GW transmits “Modify Bearer Response” to the MME, and in step S1007, to the UE via the S1 bearer and the radio access bearer set in step S1003. The “RA” received from the P-GW is transmitted.

  On the other hand, when PMIP is used between the S-GW and the P-GW, the S-GW transmits “Modify Bearer Response” to the MME in step S1006, and in step S1007, Regardless of the value of “MaxRtrAdvInterval”, “RA” is transmitted to the UE via the S1 bearer and the radio access bearer set in step S1003.

  According to the mobile communication system according to the present embodiment, in the location registration area update process of an existing UE, the MME determines whether or not it is necessary to transmit “RA” and determines that it is necessary to transmit “RA”. In this case, by setting up an S1 bearer and a radio access bearer for UE and instructing the S-GW or P-GW to notify “RA” via the S1 bearer and the radio access bearer. “RA” can be transmitted efficiently.

(Modification 1)
With reference to FIG.6 and FIG.7, the mobile communication system which concerns on the modification 1 of this invention is demonstrated. Hereinafter, the mobile communication system according to the first modification will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  In the mobile communication system according to the first modification, PMIP may be applied between the S-GW and the P-GW, similarly to the mobile communication system according to the first embodiment described above. GTP may be applied.

  As shown in FIG. 6, the S-GW or P-GW includes a reception unit 21, a determination unit 22, and a transmission unit 23.

  The receiving unit 21 of the S-GW is configured to receive various signals from eNB, MME, PCRF, P-GW, and the like. For example, the receiving unit 21 of the S-GW is configured to receive “Modify Bearer Request” from the MME.

  The receiving unit 21 of the P-GW is configured to receive various signals from PCRF, S-GW, and the like. For example, the receiving unit 21 of the P-GW is configured to receive “Modify Bearer Request” from the S-GW.

  When PMIP is applied between the S-GW and the P-GW, the determination unit 22 of the S-GW receives the “Modify Bearer Request” related to the “Service Request Procedure” by the reception unit 21. In addition, it is configured to determine whether or not it is necessary to transmit “RA” to the UE.

  Further, when GTP is applied between the S-GW and the P-GW, the P-GW determination unit 22 receives the “Modify Bearer Request” related to the “Service Request Procedure” by the reception unit 21. Is configured to determine whether or not it is necessary to transmit “RA” to the UE.

  The S-GW transmission unit 23 is configured to transmit various signals to the eNB, MME, P-GW, and the like. For example, the transmission unit 23 of the S-GW is configured to transmit “Modify Bearer Request” to the P-GW.

  Here, when the determination unit 22 of the S-GW determines that “RA” needs to be transmitted to the UE, the transmission unit 23 of the S-GW has no relation to the value of “MaxRtrAdvInterval”, It is configured to transmit “RA” to the UE via the S1 bearer and the radio access bearer set by the “Service Request procedure”.

  The transmission unit 23 of the P-GW is configured to transmit various signals to the PCRF, S-GW, and the like. For example, the transmission unit 23 of the P-GW is configured to transmit “Modify Bearer Response” to the S-GW.

  Here, when the determination unit 22 of the P-GW determines that “RA” needs to be transmitted to the UE, the transmission unit 23 of the P-GW has no relation to the value of “MaxRtrAdvInterval”, “RA” is configured to be transmitted to the UE via the S-GW and the S1 bearer and the radio access bearer set by the “Service Request procedure”.

  Hereinafter, with reference to FIG. 7, an operation of transmitting “RA” to the UE in the “Service Request procedure” of the UE in the mobile communication system according to Modification 1 will be described.

  As illustrated in FIG. 7, when the UE determines to start the “Service Request Procedure” in Step S2001, the UE transmits “NAS Service Request” to the eNB. In Step S2002, the eNB transmits to the MME. On the other hand, the “NAS Service Request” is transferred.

  In step S2003, "Authentication / Security process" is performed among the UE, MME, and HSS.

  In step S2004, when the MME transmits “S1-AP Initial Context Setup Request” to the eNB, in step S2005, a radio access bearer for UE is set between the UE and the eNB. In step S2006, The UE transmits uplink data to the P-GW via the eNB and the S-GW.

  In step S2007, the eNB transmits “S1-AP Initial Context Setup Response” to the MME. As a result, the setting of the S1 bearer for UE is completed.

  In step S2008, the MME transmits “Modify Bearer Request” to the S-GW, and in step S2009, the S-GW transmits “Modify Bearer Request” to the P-GW.

  In step S2010, “PCEF Initial IP-CAN Session Modification Process” is performed between the P-GW and the PCRF.

  In step S2011, the P-GW transmits “Modify Bearer Response” to the S-GW, and in step S2012, the S-GW transmits “Modify Bearer Response” to the MME.

  Here, when PMIP is applied between the S-GW and the P-GW, in step S2013A, the S-GW determines whether or not it is necessary to transmit “RA” to the UE. To do.

  If the S-GW determines that it is necessary to transmit “RA” to the UE, the UE sets the “Service Request Procedure” set in the “Service Request Procedure” in step S2014 regardless of the value of “MaxRtrAdvInterval”. “RA” is transmitted to the UE via the radio access bearer and the S1 bearer.

  On the other hand, when GTP is applied between the S-GW and the P-GW, in step S2013B, the P-GW determines whether or not it is necessary to transmit “RA” to the UE. .

  If the P-GW determines that “RA” needs to be transmitted to the UE, the S-GW and the “Service Request Procedure” are set in step S2014 regardless of the value of “MaxRtrAdvInterval”. “RA” is transmitted to the UE through the UE radio access bearer and S1 bearer.

  According to the mobile communication system according to the first modification, in the existing “Service Request procedure”, the S-GW or P-GW needs to determine whether or not to transmit “RA” and transmit “RA”. If it is determined that there is, “RA” can be notified to the UE via the set S1 bearer and radio access bearer for the UE, regardless of the value of “MaxRtrAdvInterval”.

  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 a UE (mobile station) periodically sends a “TAU Request (location registration area update request signal)” to an MME (mobile management node). And when the MME receives a “TAU Request” and determines that it is necessary to transmit an “RA (notification signal)” for notifying information related to an IP address assigned to the UE. , A step of setting a radio access bearer between the UE and eNB (radio base station), and an S1 bearer between the eNB and S-GW (serving gateway device), and the MME for the S-GW , Transmitting a request signal for requesting to transmit “RA”, and the S-GW transmits to the UE via the configured S1 bearer and radio access bearer according to the request signal. On the other hand, the gist is to have a step of transmitting “RA”.

  The second feature of the present embodiment is a mobile communication method, in which the UE periodically transmits “TAU Request” to the MME, and the MME receives “TAU Request”. And when determining that it is necessary to transmit “RA”, a step of setting a radio access bearer between the UE and the eNB and an S1 bearer between the eNB and the S-GW, and an MME Transmits a request signal for requesting the S-GW to transmit “RA”, and the S-GW sends the request signal to the P-GW (packet data network gateway device). And a step in which the P-GW transmits an “RA” to the UE via the S1 bearer and the radio access bearer set as the S-GW in response to the request signal. That The gist.

  The third feature of the present embodiment is a mobile communication method, and it is necessary for the S-GW or P-GW to transmit “RA” when the “Service Request (service request) procedure” is performed. The gist of the invention is that it includes a step of transmitting “RA” to the UE via the S1 bearer and the radio access bearer set in the “Service Request procedure” when it is determined that there is.

  Note that the above-described operations such as UE, eNB, MME, S-GW, P-GW, PCRF, and HSS may be performed by hardware, or may be performed by a software module executed by a processor. , Or a combination of both.

  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 a UE, eNB, MME, S-GW, P-GW, PCRF, HSS, or the like. In addition, the storage medium and the processor may be provided in the UE, eNB, MME, S-GW, P-GW, PCRF, HSS, and the like 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.

UE ... mobile station eNB ... radio base station MME ... mobile management node SGSN ... packet exchange S-GW ... serving gateway device P-GW ... packet data network gateway device PCRF ... policy and charging rule server device HSS ... subscriber management server device 11 , 21 ... receiving units 12, 22 ... determining units 13, 23 ... transmitting units

Claims (3)

A step in which the mobile station periodically transmits a location registration area update request signal to the mobility management node;
When the mobility management node receives the location registration area update request signal and determines that it is necessary to transmit a notification signal for notifying information related to an IP address to be allocated to the mobile station, the mobility management node Setting a radio access bearer between a station and a radio base station, and a bearer between the radio base station and a serving gateway device;
The mobility management node transmitting a request signal requesting the serving gateway device to transmit the notification signal;
The serving gateway device includes a step of transmitting the notification signal to the mobile station via the bearer and the radio access bearer in response to the request signal. A step in which the mobile station periodically transmits a location registration area update request signal to the mobility management node;
When the mobility management node receives the location registration area update request signal and determines that it is necessary to transmit a notification signal for notifying information related to an IP address to be allocated to the mobile station, the mobility management node Setting a radio access bearer between a station and a radio base station, and a bearer between the radio base station and a serving gateway device;
The mobility management node transmitting a request signal requesting the serving gateway device to transmit the notification signal;
The serving gateway device transmitting the request signal to a packet data network gateway device;
The packet data network gateway device has a step of transmitting the notification signal to the mobile station via the serving gateway device, the bearer and the radio access bearer in response to the request signal. A mobile communication method characterized by the above.   When the service request procedure is performed, if the serving gateway apparatus or the packet data network gateway apparatus determines that it is necessary to transmit a notification signal for notifying information related to the IP address assigned to the mobile station, the mobile station In response, the notification signal is transmitted through the radio access bearer between the mobile station and the radio base station set in the service request procedure and the bearer between the radio base station and the serving gateway device. A mobile communication method comprising the step of:

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