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WO2009075341A1 - Reprise sur incident de liaison radio - Google Patents

Reprise sur incident de liaison radio Download PDF

Info

Publication number
WO2009075341A1
WO2009075341A1 PCT/JP2008/072590 JP2008072590W WO2009075341A1 WO 2009075341 A1 WO2009075341 A1 WO 2009075341A1 JP 2008072590 W JP2008072590 W JP 2008072590W WO 2009075341 A1 WO2009075341 A1 WO 2009075341A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile radio
radio communications
connection reestablishment
mme
identity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2008/072590
Other languages
English (en)
Inventor
Caroline Jactat
David Lecompte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of WO2009075341A1 publication Critical patent/WO2009075341A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management

Definitions

  • the present invention relates to Radio Link Failure (RLF) recovery and in particular to a method of facilitating RLF recovery for a mobile radio communications device within a mobile radio communications network, and to such a device and related mobile radio communications network node device.
  • RLF Radio Link Failure
  • RRC Radio Resource Control
  • the UE In the scenario in which the cell being accessed during the recovery procedure belongs to a network node device, such as an eNB, that does not have the UE context, the UE is requested to transfer to an idle state. The subsequent attempt to recover the RRC connection is then performed by means of a Non Access Stratum (NAS) Service Request procedure.
  • NAS Non Access Stratum
  • UE context transfer between eNB is generally considered to be optional and also comprises a complex procedure in a E-UTRAN/Core Network. Also, due to poor eNB implementation, such a feature may not in any case be supported. Also, it is often apparent that the UE may have changed its location in a relatively short space of time, for example when the user is travelling by fast-moving form of transportation. In such situations, the target eNB it unlikely to have received the UE context in time to be usefully employed.
  • the present invention seeks to provide for a RLF recovery procedure, and related communications and network devices, having advantages over known such procedures and devices.
  • the inclusion of the identity information with the connection reestablishment request can advantageously allow the network node device to access the device context as required and this serves to enhance the speed with which RLF recovery can be achieved.
  • the invention does not require transfer of the mobile radio communications device into an idle mode.
  • the invention can provide for improved service continuity subsequent to the RLF and in particular since any ongoing services are not released because the mobile radio communications device does not move into an idle mode.
  • the method finds particular use when facilitating RLF recovery for a mobile radio communications device in connected mode.
  • the network node can comprise an eNB and the connection reestablishment signalling can comprise an RRC reestablishment request.
  • the said connection reestablishment signalling can comprise an RRC connection setup complete message.
  • the network node device upon receipt of an RRC connection reestablishment request, can be arranged to send an RRC connection reestablishment reject signal. From this the mobile radio communications device can infer that it should wait for SRB1 configuration conveyed in to the RRC connection setup so that it can send the required identity information, for example the NAS message, within the RRC connection setup complete message. Subsequently, the network node device will then receive the mobile radio communications device context information from the core network.
  • connection reestablishment signalling contains at least one of the identity of a mobile radio communications device by a Mobile Management Entity (MME) and a selection of the MME at the network node device while RLF is ongoing.
  • MME Mobile Management Entity
  • the identity of the mobile radio communications device by the MME can comprise a short NAS Message Authentication Code - I message.
  • the said identity can comprise UE temporary identity (S-TMSI) or the registered Core Network identity.
  • S-TMSI UE temporary identity
  • the PLMN and/or the registered Core Network identity can be provided within the RRC connection Reestablishment Request.
  • the selection by the network node of the MME while RLF is ongoing can be achieved by way of the PLMN identity and/or the registered Core Network identity.
  • a short NAS MAC - I message can be included in initial mobile radio communications device messaging over the S1 interface and so as to allow for the MME to send the device context to the network node device.
  • Another alternative that is envisaged by the present invention is not to include any NAS message within the initial UE message, and thereby avoiding any implication of NAS in the radio link failure recovery procedure when the core network identity has not changed.
  • a mobile radio communications device for operation within a mobile radio communications network and arranged for RLF recovery by way of connection reestablishment signalling to be sent to a network node, the mobile radio communications device being arranged to include identity information within the connection reestablishment signalling so as a to initiate retrieval of device context information from the core network.
  • the method finds particular use when facilitating RLF recovery for a mobile radio communications device in connected mode.
  • connection reestablishment signalling can comprise a RRC reestablishment request.
  • the mobile radio communications device can be arranged such that the connection reestablishment signalling can contain at least one of the identity of a mobile radio communications device by a Mobile Management Entity (MME) and a selection of the MME at the network node device while RLF is ongoing.
  • MME Mobile Management Entity
  • the identity of the mobile radio communications device by the MME can comprise a short NAS Message Authentication Code - 1 message.
  • the mobile radio communications device can further be arranged such that a further, short, NAS MAC - I message can be included in initial mobile radio communications device messaging over the S1 interface and so as to allow for the MME to send the device context to the network node device.
  • a mobile radio communications network node device for communication with a mobile radio communications device and associated network and arranged to receive information in combination with connection reestablishment signalling for facilitating RLF recovery, the node device further being arranged to retrieve mobile radio communications device context data from the core network and to forward the same to the said associated network for subsequent retrieval and use in the RLF recovery.
  • the said network node device comprises an eNB.
  • the network node device is arranged to forward mobile radio communications device context data to a MME within the network.
  • the invention can provide for an advantageous decrease in signalling load whilst also offering improved levels of service and, in particular, service continuity.
  • the invention is described further hereinafter, by way of example only, with reference to the accompanying drawings.
  • Fig. 1 comprises a signalling diagram between a network UE, eNB and MME according to the current art.
  • Fig. 2 comprises a similar signalling arising in relation to a RLF recovery procedure according to an embodiment of the present invention.
  • Fig. 3 comprises another signalling diagram relating to an RLF recovery procedure according to another embodiment of the present invention.
  • Fig. 4 comprises a further signalling diagram relating to yet further embodiment of the present invention.
  • the present invention relates to the proposal that the mobile radio communications device UE can provide its relevant information, i.e. the UE context, to the network, for example to a node device such as a eNB, and along with the RRC connection reestablishment request.
  • the UE context can include at least one of the PLMN identity, the UE temporary identity, such as the Temporary Mobile Subscriber Identity or indeed NAS NAC. This advantageously allows the eNB to then fetch the UE context as required and communicate this with the core network so as to facilitate RLF recovery and thereby achieve faster RRC connection resumption than can currently be achieved, and without requiring the UE to transfer to an idle mode.
  • the present invention possesses the novelty of for example, including a short NAS MAC - I message within the RRC connection reestablishment request in order for the NME to identify the UE.
  • PLMN identity can be included within the RRC connection reestablishment request to allow the eNB to select the relevant MME while the RLF procedure is ongoing and, further, a short NAS MAC - I message can be employed in the initial UE message over the S1 interface so as to allow the MME to send the UE context to the eNB as required.
  • FIG. 1 there is provided a signalling diagram according to a known RF recovery procedure and in scenario in which the eNB does not have the UE context.
  • the network signalling illustrated arises between a UE 10 such as a cell phone handset, a network node device comprising a eNB 12 and also a Mobile Management Entity (MME) 14 within the network.
  • MME Mobile Management Entity
  • a RRC connection reestablishment request 20 is then sent from the UE 10 to the eNB 12 and such a reestablishment request signal 20 can include the original UE identity and also integrity-check information.
  • the RRC connection reestablishment request signal 20 is rejected and this is confirmed in a rejection signal 22 which forces the UE 10 into its RRC_ idle mode as indicated.
  • a random access preamble 24, and related response 26 is then delivered to, and received from, the eNB 12 and before transmission of a RRC connection request 28 while in the idle mode and which includes the original, UE identity and also the PLMN identity.
  • a RRC connection reconfiguration signal 30 can then be returned from the eNB 12 to the UE 10 and which can comprise Signalling Radio Bearer configuration information.
  • an uplink transfer signal 32 can be delivered to the eNB 12 and includes a NAS service request and, in response, the eNB 12 can deliver its initial UE message 34 to the MME 14 which, in turn, replies with the S1 initial context setup signal 36 received at eNB 12 and which then initiates a RRC connection reconfiguration signal 38 allowing for radio bearer configuration to be delivered to the UE 10 so as to complete the RLF recovery procedure.
  • Fig. 2 the advantageous operation of the present invention having regard to service continuity and decreased signalling overhead can be readily appreciated.
  • signalling arising between a UE 1O eNB 12 and MME 14 is illustrated. Also, the illustration relates to a scenario in which the eNB 12 does not have RRC context for the UE 10.
  • an initial random access preamble 40 is sent to the eNB 12 and initiates a random access response 42 returned to the UE 10.
  • the UE 10 then provides its RRC connection reestablishment request 44 to the eNB 12 which, in accordance with the invention, includes its UE context which, in addition to the original UE identity and integrity check information includes, in the illustrated embodiment, NAS MAC - 1 data and also the PLMN identity.
  • the provision of the UE context within the connection reestablishment request 44 can itself initiate the initial UE message 46 from the eNB 12 to the MME 14 and, as noted, without requiring the UE 12 to enter into its RRC_ idle mode.
  • the initial UE message 40 can contain a short, NAS message for the
  • the initial UE message 46 can include a short NAS MAC - I message.
  • the eNB 12 is arranged to return a RRC connection reestablishment signal 48 to the UE 10 and which comprises signalling radio bearer configuration data.
  • the MME 14 is able to signal to the eNB 12 at the appropriate initial context setup, i.e. the UE context, data 50 such that the eNB 12 can then deliver its RRC connection reconfiguration signal 52 containing the radio bearer configuration data to the UE 10 so as to achieve the required RLF recovery.
  • the RRC Connection Reestablishment Request shall contain NAS MAC-I (short NAS message for the MME to identify the UE) and the PLMN identity so that the eNB can select the MME. It should be noted that if there is a limited size for the RRC
  • the NAS MAC - 1 and/or PLMN identity can be subsequently sent to the eNB in an UL Direct Transfer message.
  • MME shall infer a Radio Link Failure has occurred on the E-EUTRA interface and perform an S1 context setup to send the UE context to the eNB.
  • the UE shall supersede the current RRC context.
  • FIG. 3 there is illustrated a signalling diagram according to a further embodiment of the present invention. Again, signalling arising between a UE 10, eNB 12 and MME 14 is illustrated and with the UE 10 in an RRC connected state.
  • this illustrated embodiment is based upon an alternative manner of sending the NAS NAC-I information to the MME 14, and this time by way of connection re- establishment signalling comprising a RRC connection setup complete message.
  • a message inherently allows for the delivery of a NAS message and so this as aspect of the invention can be implemented with only minimal amendments to the current RRC connection re- establishment procedure.
  • the eNB 12 upon reception of the RRC connection re-establishment request, serves to send a RRC connection re-establishment reject message - perhaps identifying "unknown UE context" as its cause of rejection.
  • the UE 10 can then confirm that it has sufficient time to wait for the SRB 1 configuration to be conveyed into RRC connection setup so that it can send the NAS message in the RRC connection setup completer message. Subsequently, the eNB 12 will then retrieve and receive the UE context from the MME 14 for use in the same manner as discussed in relation to the previous embodiment.
  • Fig. 3 there is illustrated the random access signalling comprising the preamble 54 and response 56 and the subsequent RRC connection reestablishment request 58.
  • the RRC connection re-establishment reject signal 16 noted above is then delivered from the eNB 12 to the UE 12 such that the UE then infers that the eNB 12 does not have the UE context.
  • the UE 10 however does not interrupt its reestablishment outcome timer but rather waits for the SRB 1 configuration to send the NAS message.
  • the RRC connection setup complete message 64 is then delivered from the UE 10 to the eNB 12 containing the identity information in the form of, for example, PLMN identity, or NAS MAC-1.
  • the above represents a further embodiment of the present invention permitting a faster RRC connection resumption without requiring the UE 10 to move into an "idle" state.
  • FIG. 4 there is again illustrated signalling arising between a UE 10, an eNB 12 and MME 14.
  • a random access preamble signal 72 is again delivered from the UE 10 to the eNB 12 and which serves to initiate a random access response 74.
  • the RRC connection reestablishment request 76 is then delivered from the UE 10 to the eNB 12 and the eNB 12 employs the PLMN identity and registered MME to select the core network entity.
  • the eNB 12 is arranged to reject the RRC connection reestablishment request from the UE 10.
  • the MME 14 Upon receipt of an initial UE message 78 from the eNB 12, the MME 14 is arranged to release the S1 connection with the previous eNB (if in existence) and to then setup a S1 connection with the new eNB. Subsequent to this, a RRC connection reestablishment signal 80 is delivered from the eNB 12 to the UE 10 and initial context setup signalling 82 is delivered from the MME 14 to the eNB 12.
  • the signalling diagram Fig. 4 illustrates a further procedure for avoiding the implication of the NAS protocol, this time through the inclusion of the PLMN identity and the registered core network identity within the RRC connection reestablishment request message.
  • the target eNB can then select the previous core network entity to which the UE is connected prior to the radio link failure. Accordingly, the eNB transfer of the UE identity to the MME serves to allow the eNB to retrieve the UE context. Should, however, a scenario arise in which the eNB is unable to select the indicated MME, the eNB can move the UE to its idle state as required.
  • the invention therefore proves advantageous insofar as, upon radio failure, and improve speed of RRC connection assumption for service continuity can be achieved whilst also incurring reduced signalling loads over the E-TRAN interface and reduce signalling overhead over the S1 interface.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé pour faciliter la reprise sur incident de liaison radio pour un dispositif de communication radio mobile à l'intérieur d'un réseau de communication radio mobile et dans lequel une demande de rétablissement de connexion est envoyée depuis le dispositif de communication radio mobile vers le dispositif de nœud de réseau radio mobile, et selon lequel des informations de contexte du dispositif sont incluses dans le signal de demande de rétablissement de connexion. L'invention concerne également un dispositif de communication radio mobile associé et un dispositif de nœud de réseau.
PCT/JP2008/072590 2007-12-13 2008-12-05 Reprise sur incident de liaison radio Ceased WO2009075341A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB0724316A GB2455707A (en) 2007-12-13 2007-12-13 Radio link failure recovery
GB0724316.5 2007-12-13
GB0805227.6 2008-03-20
GB0805227A GB2455818A (en) 2007-12-13 2008-03-20 Radio link failure recovery
GB0820037.0 2008-11-03
GB0820037A GB2455610A (en) 2007-12-13 2008-11-03 Radio link failure recovery

Publications (1)

Publication Number Publication Date
WO2009075341A1 true WO2009075341A1 (fr) 2009-06-18

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Application Number Title Priority Date Filing Date
PCT/JP2008/072590 Ceased WO2009075341A1 (fr) 2007-12-13 2008-12-05 Reprise sur incident de liaison radio

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GB (3) GB2455707A (fr)
WO (1) WO2009075341A1 (fr)

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CN101827428A (zh) * 2010-04-22 2010-09-08 新邮通信设备有限公司 减小无线链路失败时数据丢失的方法及中继
EP2252127A1 (fr) * 2009-05-15 2010-11-17 HTC Corporation Procédé de gestion de la restauration d'une connexion de contrôle de ressources radio (RRC)
WO2011015248A1 (fr) * 2009-08-07 2011-02-10 Nokia Siemens Networks Oy Fonctionnement dans le cas d'une défaillance de liaison radio
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CN102223713A (zh) * 2011-06-15 2011-10-19 电信科学技术研究院 通知小区信息和rrc连接重建的方法、系统及设备
CN102595561A (zh) * 2012-03-30 2012-07-18 华为技术有限公司 无线资源控制连接重建的方法及终端
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WO2017135779A1 (fr) * 2016-02-05 2017-08-10 엘지전자 주식회사 Procédé et appareil permettant de réaliser une reprise de connexion rrc dans un système de communication sans fil
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EP2252127A1 (fr) * 2009-05-15 2010-11-17 HTC Corporation Procédé de gestion de la restauration d'une connexion de contrôle de ressources radio (RRC)
US20100291939A1 (en) * 2009-05-15 2010-11-18 Yu-Chih Jen Method of Handling Radio Resource Control Connection and Related Communication Device
WO2011015248A1 (fr) * 2009-08-07 2011-02-10 Nokia Siemens Networks Oy Fonctionnement dans le cas d'une défaillance de liaison radio
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KR101781853B1 (ko) * 2010-02-09 2017-09-28 엘지전자 주식회사 무선 통신 시스템에서 복수의 셀의 구성 정보 송수신 방법 및 장치
CN102104982B (zh) * 2010-04-01 2014-06-04 电信科学技术研究院 一种多载波系统的连接重建方法和设备
CN102104982A (zh) * 2010-04-01 2011-06-22 电信科学技术研究院 一种多载波系统的连接重建方法和设备
WO2011120445A1 (fr) * 2010-04-01 2011-10-06 电信科学技术研究院 Procédé et dispositif pour le rétablissement d'une connexion dans un système à porteuses multiples
CN101827428A (zh) * 2010-04-22 2010-09-08 新邮通信设备有限公司 减小无线链路失败时数据丢失的方法及中继
CN101827428B (zh) * 2010-04-22 2012-11-14 新邮通信设备有限公司 减小无线链路失败时数据丢失的方法及中继
CN102223713A (zh) * 2011-06-15 2011-10-19 电信科学技术研究院 通知小区信息和rrc连接重建的方法、系统及设备
WO2013107391A1 (fr) 2012-01-18 2013-07-25 Mediatek Inc. Procédé de restauration de connexion améliorée et de restauration de données sans perte
EP2659711A4 (fr) * 2012-01-18 2016-07-13 Mediatek Inc Procédé de restauration de connexion améliorée et de restauration de données sans perte
US9504082B2 (en) 2012-01-18 2016-11-22 Mediatek Inc. Method of enhanced connection recovery and loss-less data recovery
US9661678B2 (en) 2012-01-18 2017-05-23 Mediatek Inc. Method of enhanced connection recovery and cell selection
CN102595561A (zh) * 2012-03-30 2012-07-18 华为技术有限公司 无线资源控制连接重建的方法及终端
EP3314839A4 (fr) * 2015-06-24 2018-12-05 Telefonaktiebolaget L M Ericsson (publ) Procédés, noeuds de réseau, dispositif de communication, programmes informatiques et produits-programmes d'ordinateur pour le rétablissement d'une connexion
US10251101B2 (en) 2015-06-24 2019-04-02 Telefonaktiebolaget Lm Ericsson (Publ) Methods, network nodes, communication device, computer programs and computer program products for re-establishment of a connection
WO2017135779A1 (fr) * 2016-02-05 2017-08-10 엘지전자 주식회사 Procédé et appareil permettant de réaliser une reprise de connexion rrc dans un système de communication sans fil
US10681767B2 (en) 2016-02-05 2020-06-09 Lg Electronics Inc. Method and apparatus for performing RRC connection resume in wireless communication system
CN110140413A (zh) * 2016-03-31 2019-08-16 日本电气株式会社 通信系统
CN110073714A (zh) * 2016-11-04 2019-07-30 高通股份有限公司 用于由于无线电链路故障而重建无线电通信链路的方法及设备
US11895723B2 (en) 2016-11-04 2024-02-06 Qualcomm Incorporated Method, apparatus, and system for reestablishing radio communication links due to radio link failure
CN110073714B (zh) * 2016-11-04 2023-05-12 高通股份有限公司 用于由于无线电链路故障而重建无线电通信链路的方法及设备
US11523280B2 (en) 2017-04-21 2022-12-06 Nokia Technologies Oy Radio link recovery for user equipment
US12063507B2 (en) 2017-04-21 2024-08-13 Nokia Technologies Oy Radio link recovery for user equipment
WO2021229136A1 (fr) * 2020-05-13 2021-11-18 Nokia Technologies Oy Prolongement de service vocal dans un état actif
US11134420B1 (en) 2020-05-13 2021-09-28 Nokia Technologies Oy Prolonging voice service in an active state
CN113285200A (zh) * 2021-05-28 2021-08-20 深圳振华富电子有限公司 一种超宽带功分器

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GB0805227D0 (en) 2008-04-30
GB0820037D0 (en) 2008-12-10

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