US20140016553A1 - Mobile communication method, mobile management node, and serving gateway apparatus - Google Patents

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

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Publication number
US20140016553A1
US20140016553A1 US13/978,213 US201113978213A US2014016553A1 US 20140016553 A1 US20140016553 A1 US 20140016553A1 US 201113978213 A US201113978213 A US 201113978213A US 2014016553 A1 US2014016553 A1 US 2014016553A1
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Prior art keywords
gateway apparatus
mme
mobile
state
mobile station
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US13/978,213
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English (en)
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Katsutoshi Nishida
Toshiyuki Tamura
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NEC Corp
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NEC Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present invention relates to a mobile communication method, a mobile management node, and a serving gateway apparatus.
  • EPS Evolved Packet System
  • P-GW Packet Data Network-Gateway, packet data network gateway apparatus
  • MME Mobility Management Entity, mobile management node
  • step S 3001 when the MME# 1 is restarted in step S 3001 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 .
  • first state 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
  • 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 .
  • step S 3002 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 S 3003 .
  • step S 3004 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 .
  • DDN Downlink Data Notification, downlink notification signal
  • step S 3005 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”.
  • IMSI International Mobile Subscriber Identity
  • step S 3006 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.
  • step S 3007 the MME# 2 performs location registration processing for the UE with an HSS (Home Subscriber Server, subscriber information server apparatus).
  • HSS Home Subscriber Server, subscriber information server apparatus
  • 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 .
  • step S 3009 the MME# 2 transmits “Attach Accept” to the UE.
  • step S 3011 the P-GW# 1 transmits the user data whose destination is the UE to the S-GW# 1 through the EPS bearer # 1
  • step S 3012 the S-GW# 1 transmits, in a similar manner as step S 3004 , 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 .
  • step S 3013 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 S 3014 .
  • the “Paging” whose destination is to the UE specified by the S-TMSI in place of the IMSI may be transmitted.
  • transmission of the “Paging” in step S 3013 consumes unnecessary radio resources.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 4 is a sequence diagram illustrating operation of a mobile communication system of a related art.
  • FIGS. 1 and 2 a mobile communication system according to the first exemplary embodiment of the present invention will be described.
  • the mobile communication system 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.
  • 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.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • step S 1001 when the MME# 1 is restarted in step S 1001 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 .
  • first state a 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
  • 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 .
  • 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.
  • QCI QoS Class Identifier
  • ARP Allocation Retention Priority
  • the P-GW# 1 Upon receiving user data whose destination is the UE on an EPS bearer # 1 from an external network in step S 1002 , 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 S 1003 .
  • step S 1004 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).
  • the “EPS Bearer ID# 1 ” shall not necessarily be set.
  • step S 1005 the MME# 1 transmits “DDN Ack”, which is a response signal for “DDN”, to the S-GW# 1 .
  • DDN Ack a response signal for “DDN”
  • the “DDK Ack” shall not necessarily be transmitted.
  • step S 1006 /S 1007 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”.
  • the “Paging” whose destination is the UE specified by the S-TMSI in place of the IMSI may be transmitted.
  • step S 1008 prior to execution of step S 1008 , the UE transmits “Service Request” to the MME# 1 , and the MME# 1 notifies the UE of a reject signal, thereby activating step S 1008 which is described later.
  • step S 1008 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.
  • step S 1009 the MME# 2 transmits “Update Location Request” to the HSS so as to start location registration processing for the UE.
  • step S 1010 the HSS transmits “Cancel Location Request (positional information deletion request signal)” to the MME# 1 .
  • step S 1011 the MME# 1 detects that the UE re-attached by having received the “Cancel Location Request”.
  • step S 1012 the MME# 1 transmits “Cancel Location Answer” to the HSS.
  • step S 1013 the HSS transmits “Update Location Request” to the MME# 2 .
  • step S 1014 a PDN connection # 2 including one or more EPS bearers # 2 is set among the UE, the S-GW# 2 , and the P-GW# 2 .
  • step S 1015 the MME# 2 transmits “Attach Accept” to the UE.
  • the P-GW# 1 upon receiving the user data whose destination is the UE on the EPS bearer # 1 from the external network in step S 1016 , 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 S 1017 .
  • step S 1018 the S-GW# 1 transmits the “DDN” including the IMSI of the UE to the MME# 1 , in a similar manner as step S 1003 , because the PDN connection # 1 is released between the UE and the S-GW# 1 .
  • the MME# 1 since the MME# 1 has detected that the UE specified by the “IMSI” included in the “DDN” is already attached, the MME# 1 will not transmit the “Paging” whose destination is the UE.
  • step S 1019 the MME# 1 transmits to the S-GW# 1 the “DDN Ack” or “DDN Failure” including notification information for requesting release of the PDN connection # 1 of the UE held between the S-GW# 1 and the P-GW# 1 .
  • the MME# 1 may include the “EPS Bearer ID# 1 ” in the “DDN Ack” or the “DDN Failure”. Further, when the MME# 1 holds context information (information on the UE), such as the S-TMSI allocated to the UE before restart, in the memory, the context information may be deleted.
  • step S 1020 upon receiving the above-mentioned “notification information”, the S-GW# 1 transmits “Delete Session Request” including “Linked Beare ID# 1 ” corresponding to the “IMSI” of the UE to the P-GW# 1 so as to release the PDN connection # 1 which is set between the S-GW# 1 and the P-GW# 1 and which corresponds to the “EPS Bearer ID# 1 ”.
  • Linked Beare ID# 1 herein described refers to identification information for identifying the PDN connection # 1 .
  • step S 1021 after the PDN connection # 1 is released, the P-GW# 1 transmits “Delete Session Response” to the S-GW# 1 .
  • the mobile communication system is configured such that, upon receiving the “Cancel Location Request” for the UE, the MME# 1 detects that the UE has re-attached, and after that, even upon receiving the “DDN” in which the IMSI is set for instructing transmission of the “Paging” whose destination is the UE, the MME# 1 will not transmit the “Paging” whose destination is the UE. Avoiding transmission of the unnecessary “Paging” in this way enables avoiding consumption of unnecessary radio resources and generation of communication disconnect.
  • step S 2001 when the MME# 1 is restarted in step S 2001 in a state (first state) in which the 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 .
  • step S 2002 the UE transmits “Tracking Area Update Request (location registration area update request signal)” or “Service Request (service request signal)” to the MME# 1 .
  • the MME# 1 transmits “Tracking Area Update Reject (location registration area reject signal” or “Service Reject (service reject signal)” to the UE because the MME# 1 does not hold the context information of the UE in step S 2003 .
  • step S 2004 upon receiving the “Tracking Area Update Request” or the “Service Request”, the UE transmits the “Attach Request” to the MME# 2 .
  • steps S 2005 to S 2017 are the same as the operations in steps S 1009 to S 1021 shown in FIG. 2 .
  • the present invention is not limited to the above-described cases, but can also be applied to the case where the UE transmits the “Attach Request” to the restarted MME# 1 , upon executing the re-attach processing.
  • the MME# 1 upon receiving the “DDN” in which the IMSI of the UE is set, the MME# 1 transmits to the S-GW# 1 the “DDN Ack” or the “DDN Failure” including the notification information for requesting release of the PDN connection # 1 held between the S-GW# 1 and the P-GW# 1 .
  • a first exemplary aspect of this exemplary embodiment is a mobile communication method in a mobile communication system in which when the MME# 1 (first mobile management node) is restarted in the first state in which the PDN connection # 1 (connection) including one or more EPS bearers # 1 (bearer) is set among the UE (mobile station), the S-GW# 1 (first serving gateway apparatus), and the P-GW# 1 (first packet data network gateway apparatus), the first state transitions to the 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 , the mobile communication method including the step of not transmitting, by the MME# 1 , the “Paging (paging signal)” whose destination is the UE upon receiving the “DDN (downlink data notification signal)” including the IMSI of the UE (identification information of the mobile station) after detecting that the re-attach processing for the UE has been executed in the second state
  • the first exemplary aspect of this exemplary embodiment may further include the steps of: notifying, by the MME# 1 , the S-GW# 1 of not transmitting the “Paging” when not transmitting the “Paging” whose destination is the UE; and releasing, by the S-GW# 1 , the PDN connection # 1 (connection) between the S-GW# 1 and the P-GW# 1 in response to the notification.
  • a second exemplary aspect of this exemplary embodiment is an MME that operates as the MME# 1 in a mobile communication system in which when the MME# 1 is restarted in the first state in which the 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 first state transitions to the 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
  • the MME being configured not to transmit the “Paging” whose destination is the UE upon receiving the “DDN” including the IMSI of the UE after detecting that the re-attach processing for the UE has been executed in the second state.
  • the MME when the MME does not transmit the “Paging” whose destination is the UE, the MME may be configured to notify the S-GW# 1 of not transmitting the “Paging”.
  • a third exemplary aspect of this exemplary embodiment is an S-GW that operates as the S-GW# 1 in a mobile communication system in which when the MME# 1 is restarted in the first state in which the 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 first state transitions to the 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 , the S-GW being configured to release the PDN connection # 1 upon, in the second state, transmitting to the MME# 1 the “DDN” including the IMSI of the UE in response to the user data whose destination is the UE received through the EPS bearer # 1 and also receiving the “DDN Ack” or the “DDN Failure” including the notification information for requesting release of the PDN connection # 1 .
  • MME# 1 , MME# 2 , S-GW# 1 , S-GW# 2 , P-GW# 1 , P-GW# 2 , eNB# 1 , eNB# 2 , and UE may be implemented by hardware, a software module executed by a processor, or a combination thereof.
  • the software module may be provided in storage media of any form such as RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable ROM), register, hard disk, removable disk, or CD-ROM.
  • RAM Random Access Memory
  • flash memory ROM (Read Only Memory)
  • EPROM Erasable Programmable ROM
  • EEPROM Electrically Erasable and Programmable ROM
  • register hard disk, removable disk, or CD-ROM.
  • the storage media are connected to the processor so that the processor can read and write information from and to the storage media.
  • the storage media may be integrated in the processor.
  • the storage media and the processor may be provided in an ASIC.
  • the ASIC may be provided in the MME# 1 , MME# 2 , S-GW# 1 , S-GW# 2 , P-GW# 1 , P-GW# 2 , eNB# 1 , eNB# 2 , and UE.
  • the storage media and the processor may be provided, as discrete components, in the MME# 1 , MME# 2 , S-GW# 1 , S-GW# 2 , P-GW# 1 , P-GW# 2 , eNB# 1 , eNB# 2 , and UE.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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JP2011002555A JP5011439B2 (ja) 2011-01-07 2011-01-07 移動通信方法、移動管理ノード及びサービングゲートウェイ装置
PCT/JP2011/077486 WO2012093531A1 (ja) 2011-01-07 2011-11-29 移動通信方法、移動管理ノード及びサービングゲートウェイ装置

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US10701666B2 (en) 2020-06-30
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