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Mobile communication method, mobile management node, and serving gateway apparatus

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Mobile communication method, mobile management node, and serving gateway apparatus


A mobile communication method in a mobile communication system according to the present invention in which when MME#1 is restarted in a first state in which a PDN connection #1 including one or more EPS bearers #1 is set among a UE, an S-GW#1, and a P-GW#1, the first state transitions to a second state in which the PDN connection #1 is released between the UE and the S-GW#1 and the connection is maintained only between the S-GW#1 and the P-GW#1, the mobile communication method including the step of not transmitting, by the MME#1, “Paging” whose destination is the UE upon receiving “DDN” including IMSI of the UE after detecting that re-attach processing for the mobile station has been executed in the second state.
Related Terms: Gateway Communication System Paging State Transition

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USPTO Applicaton #: #20140016553 - Class: 370328 (USPTO) -
Multiplex Communications > Communication Over Free Space >Having A Plurality Of Contiguous Regions Served By Respective Fixed Stations

Inventors: Katsutoshi Nishida, Toshiyuki Tamura

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The Patent Description & Claims data below is from USPTO Patent Application 20140016553, Mobile communication method, mobile management node, and serving gateway apparatus.

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TECHNICAL FIELD

The present invention relates to a mobile communication method, a mobile management node, and a serving gateway apparatus.

BACKGROUND ART

In a mobile communication system of an EPS (Evolved Packet System) type specified in 3GPP, there is proposed an operation to be carried out when a P-GW (Packet Data Network-Gateway, packet data network gateway apparatus) #1 receives user data whose destination is a UE (User Equipment) in an idle state under control of an MME (Mobility Management Entity, mobile management node) #1, after the MME#1 which has been suspended due to a failure or the like is restarted.

The operation will be described below with reference to FIG. 4.

As shown in FIG. 4, when the MME#1 is restarted in step S3001 in a state (first state) in which a PDN connection #1 including one or more EPS bearers #1 is set among the UE, an S-GW (Serving Gateway, serving gateway apparatus) #1, and the P-GW#1, the state transitions to a state (second state) in which the PDN connection #1 is released between the UE and the S-GW#1 and the PDN connection #1 is maintained only between the S-GW#1 and the P-GW#1.

In step S3002, upon receiving user data whose destination is the UE on the EPS bearer #1 from an external network, the P-GW#1 transmits the user data whose destination is the UE to the S-GW#1 through the EPS bearer #1 in step S3003.

In step S3004, the S-GW#1 transmits “DDN (Downlink Data Notification, downlink notification signal)” to the MME#1, because the PDN connection #1 is released between the UE and the S-GW#1.

In step S3005, upon receiving the “DDN”, the MME#1 transmits “Paging” whose destination is the UE specified by “IMSI (International Mobile Subscriber Identity)” included in the “DDN”.

In step S3006, upon receiving the “Paging” whose destination is the UE, the UE transmits “Attach Request (attach request signal)” to a core network so as to start re-attach processing. The “Attach Request” is transferred to an MME#2 via a radio access network.

In step S3007, the MME#2 performs location registration processing for the UE with an HSS (Home Subscriber Server, subscriber information server apparatus).

In step S3008, a PDN connection #2 including one or more EPS bearers #2 is set among the UE, an S-GW#2, and a P-GW#2.

In step S3009, the MME#2 transmits “Attach Accept” to the UE.

CITATION LIST Non Patent Literature

[Non Patent Literature 1] 3GPP TR23.857

SUMMARY

OF INVENTION Technical Problem

However, in the example of FIG. 4, when the P-GW#1 receives the user data whose destination is the UE on the EPS bearer #1 from the external network in step S3010, the following problem occurs.

That is, in step S3011, the P-GW#1 transmits the user data whose destination is the UE to the S-GW#1 through the EPS bearer #1, and in step S3012, the S-GW#1 transmits, in a similar manner as step S3004, the “DDN” in which the IMSI is set to the MME #1 because the PDN connection #1 is released between the UE and the S-GW#1.

As a result, in step S3013, upon receiving the “DDN”, the MME#1 transmits the “Paging” whose destination is the UE specified by the

“IMSI” included in the “DDN”, thereby consuming unnecessary radio resources while causing a communication disconnect in step S3014.

Alternatively, when the MME#1 holds S-TMSI or the like in a memory, the “Paging” whose destination is to the UE specified by the S-TMSI in place of the IMSI may be transmitted. In this case, transmission of the “Paging” in step S3013 consumes unnecessary radio resources.

Accordingly, the present invention has been made in view of the above-mentioned problem, and an object of the present invention is to provide a mobile communication method, a mobile management node, and a serving gateway apparatus which are capable of avoiding transmission of the unnecessary paging signal after the MME#1 which has been suspended due to a failure or the like is restarted.

Solution to Problem

A first exemplary aspect of the present invention is a mobile communication method in a mobile communication system in which when a first mobile management node is restarted in a first state in which a connection including one or more bearers is set among a mobile station, a first serving gateway apparatus, and a first packet data network gateway apparatus, the first state transitions to a second state in which the connection is released between the mobile station and the first serving gateway apparatus and the connection is maintained only between the first serving gateway apparatus and the first packet data network gateway apparatus, the mobile communication method including the step of not transmitting, by the first mobile management node, a paging signal whose destination is the mobile station upon receiving a downlink data notification signal including identification information of the mobile station after detecting that re-attach processing for the mobile station is completed in the second state.

A second exemplary aspect of the present invention is a mobile management node that operates as a first mobile management node for use in a mobile communication system in which when the first mobile management node is restarted in a first state in which a connection including one or more bearers is set among a mobile station, a first serving gateway apparatus, and a first packet data network gateway apparatus, the first state transitions to a second state in which the connection is released between the mobile station and the first serving gateway apparatus and the connection is maintained only between the first serving gateway apparatus and the first packet data network gateway apparatus, the mobile management node being configured not to transmit a paging signal whose destination is the mobile station upon receiving a downlink data notification signal including identification information of the mobile station after detecting that re-attach processing for the mobile station is completed in the second state.

A third exemplary aspect of the present invention is a serving gateway apparatus that operates as a first serving gateway apparatus in a mobile communication system in which when a first mobile management node is restarted in a first state in which a connection including one or more bearers is set among a mobile station, a first serving gateway apparatus, and a first packet data network gateway apparatus, the first state transitions to a second state in which the connection is released between the mobile station and the first serving gateway apparatus and the connection is maintained only between the first serving gateway apparatus and the first packet data network gateway apparatus, the serving gateway apparatus being configured to release the connection upon, in the second state, transmitting to the first mobile management node a downlink data notification signal including identification information of the mobile station in response to user data whose destination is the mobile station received through the bearer and also receiving a response signal for the downlink data notification signal including notification information for requesting release of the connection.

Advantageous Effects of Invention

As described above, according to the present invention, it is possible to provide a mobile communication method, a mobile management node, and a serving gateway apparatus which are capable of avoiding transmission of an unnecessary paging signal after the MME#1 which has been suspended due to a failure or the like is restarted.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an overall configuration diagram of a mobile communication system according to a first exemplary embodiment of the present invention;

FIG. 2 is a sequence diagram illustrating operation of the mobile communication system according to the first exemplary embodiment of the present invention;

FIG. 3 is a sequence diagram illustrating operation of a mobile communication system according to Modified Example 1 of the present invention; and

FIG. 4 is a sequence diagram illustrating operation of a mobile communication system of a related art.

DESCRIPTION OF EMBODIMENTS (Mobile Communication System According to a First Exemplary Embodiment of the Present Invention)

Referring to FIGS. 1 and 2, a mobile communication system according to the first exemplary embodiment of the present invention will be described.

As shown in FIG. 1, the mobile communication system according to this exemplary embodiment includes a P-GW#1, a P-GW#2, an S-GW#1, an S-GW#2, an MME#1, an MME#2, an E-UTRAN (Evolved Universal Terrestrial Radio Access Network), and an HSS.

Hereinafter, referring to FIG. 2, description will be made of operation to be carried out when the P-GW#1 receives user data whose destination is a UE in an idle state under control of the MME#1, after the MME#1 which has been suspended due to a failure or the like is restarted in the mobile communication system according to this exemplary embodiment.

As shown in FIG. 2, when the MME#1 is restarted in step S1001 in a state (first state) in which a PDN connection #1 including one or more EPS bearers #1 is set among the UE, the S-GW#1, and the P-GW#1, the state transitions to a state (second state) in which the PDN connection #1 is released between the UE and the S-GW#1 and the PDN connection #1 is maintained only between the S-GW#1 and the P-GW#1.

Note that in this case, the S-GW#1 may be set such that only a specific EPS bearer in the PDN connection #1 is not released between the S-GW#1 and the P-GW#1.

The EPC bearer may be set the necessity of releasing the EPS bearer in the S-GW#1 by use of QCI (QoS Class Identifier), a priority type “ARP (Allocation Retention Priority)”, or the like.

Upon receiving user data whose destination is the UE on an EPS bearer #1 from an external network in step S1002, the P-GW#1 transmits the user data whose destination is the UE to the S-GW#1 through the EPS bearer #1 in step S1003.

In step S1004, the S-GW#1 transmits the “DDN” including an IMSI of the UE and “EPS Bearer ID#1” which is identification information of the EPS bearer #1 to the MME#1, because the PDN connection #1 is released between the UE and the S-GW#1 (that is, because restart of the MME#1 is detected by a GTP echo signal or the like). Note that the “EPS Bearer ID#1” shall not necessarily be set.

In step S1005, the MME#1 transmits “DDN Ack”, which is a response signal for “DDN”, to the S-GW#1. Note that the “DDK Ack” shall not necessarily be transmitted.

In step S1006/S1007, upon receiving the “DDN” in which the IMSI is set, the MME#1 transmits “Paging” whose destination is the UE specified by the “IMSI” included in the “DDN” while storing information indicating the transmission of the “Paging”.

When the MME#1 holds S-TMSI or the like in a memory, the “Paging” whose destination is the UE specified by the S-TMSI in place of the IMSI may be transmitted.

In this case, prior to execution of step S1008, the UE transmits “Service Request” to the MME#1, and the MME#1 notifies the UE of a reject signal, thereby activating step S1008 which is described later.

In step S1008, upon receiving the “Paging” whose destination is the UE, the UE transmits the “Attach Request” including the IMSI of the UE to a core network so as to start re-attach processing. The “Attach Request” is transferred to the MME#2 via a radio access network.

In step S1009, the MME#2 transmits “Update Location Request” to the HSS so as to start location registration processing for the UE.

In step S1010, the HSS transmits “Cancel Location Request (positional information deletion request signal)” to the MME#1.



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stats Patent Info
Application #
US 20140016553 A1
Publish Date
01/16/2014
Document #
13978213
File Date
11/29/2011
USPTO Class
370328
Other USPTO Classes
International Class
04W68/02
Drawings
5


Gateway
Communication System
Paging
State Transition


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