WO2008095935A1 - Procédé de transfert - Google Patents

Procédé de transfert Download PDF

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Publication number
WO2008095935A1
WO2008095935A1 PCT/EP2008/051409 EP2008051409W WO2008095935A1 WO 2008095935 A1 WO2008095935 A1 WO 2008095935A1 EP 2008051409 W EP2008051409 W EP 2008051409W WO 2008095935 A1 WO2008095935 A1 WO 2008095935A1
Authority
WO
WIPO (PCT)
Prior art keywords
enb
base station
handover
state
drx
Prior art date
Application number
PCT/EP2008/051409
Other languages
English (en)
Inventor
David Randall
Original Assignee
Nokia Siemens Networks Gmbh & Co. Kg
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 Nokia Siemens Networks Gmbh & Co. Kg filed Critical Nokia Siemens Networks Gmbh & Co. Kg
Publication of WO2008095935A1 publication Critical patent/WO2008095935A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/249—Reselection being triggered by specific parameters according to timing information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • UE In the universal mobile telecommunications system (UMTS) long term evolution (LTE) cellular radio system, user devices, known as user equipments (UE) can be in one of two radio resource control (RP-C) states, RRC_Idle and RRC_Connected.
  • RRC_Idle state a UE has no connection with any base station, or enhanced node B (eNB) and performs autonomous cell reselection.
  • eNB enhanced node B
  • RRC_Connected state the UE has a connection with a particular eNB and transition between cells is by way of network-controlled handover.
  • a UE that is in RRC Connected state can be placed in a discontinuous operating mode, sometimes referred to as discontinuous receiving (DRx), whereby the UE need only receive during periodic time intervals.
  • DRx discontinuous receiving
  • the UE can be instructed to enter a DRx state by the network, for example by the RRC entity in the eNB, or it could autonomously enter a DRx state after a period of data transfer inactivity. The interval between the times when the UE receives, the DRx period, could be increased the longer the UE has been activity.
  • This change in period can be signalled to the UE by the eNB, or it can be changed autonomously by the UE.
  • the eNB and the UE must both have a precise knowledge of the DRx period in use by the UE, consequently if the UE changes autonomously it must do so using predefined rules based on time intervals that are known by the eNB. If the UE recommences data transfer, or the data transfer rate increases above a threshold level the UE can be changed from DRx operation to normal operation.
  • RRC state One potential trigger for the change of RRC state is data transfer inactivity detected at the serving eNB (i.e. at the eNB with which the UE has a signalling/ data connection and which controls its behaviour). Data transfer activity might be measured taking account of user data transfer and non-access stratum signalling. One possibility would be for the eNB to set a timer running when activity in these domains stops, the timer being stopped when activity recommences.
  • a second possible trigger for the change of RRC state is the time that the UE has been in DRx operation, or the completion, by the UE, of a particular length of time with a particular DRx period e.g. the maximum DRx period.
  • the eNB is aware of the length of time that the UE has been in a particular DRx operating mode and can initiate the transition from RRC Connected state to RRC Idle state, when the completion of the appropriate time periods has been detected.
  • the serving eNB detects from measurement reports that the UE should change the eNB through which it operates.
  • the serving eNB will select a target (replacement) eNB and request that it accepts the UE. If the target eNB is able to accept the UE, men the serving eNB transmits a Handover Command message to the UE, instructing it to establish communication through the target eNB.
  • the serving eNB transfers a UE context, i.e. a set of UE specific information, to the target eNB to enable communication with it e. g security parameters.
  • a method of handover of a user device from a serving base station to a target base station in a communication system comprises transferring from the serving base station to the target base station, one or more parameters relating to operation the user device prior to handover.
  • the parameters relate to elapsed time of operation of a particular state of the user device, or to the state of operation itself.
  • the or each parameter is transferred as part of a context transfer.
  • the system is a UMTS LTE system
  • the user device is a UMTS LTE UE
  • the base station is an eNB.
  • the target eNB In order to enable the target eNB to transfer the UE from RRC Connected to
  • the target eNB requires from the serving eNB, dependent upon how the change of state is triggered, one or a combination of more than one of the following parameters.
  • the parameters can be transferred from the serving eNB to the target eNB as part of the UE context transfer.
  • the UE may transition from DRx to make measurement reports and engage in RRC signalling associated with the handover hence there is some timing uncertainty.
  • the present invention has the advantage that the state transition can be based on a UE's activity level, even if handovers are taking place. This is particularly the case when UEs are fast moving and making frequent cell changes. If the necessary ones of the parameters listed above were not transferred with the context, then the inactivity history of the UE would be lost and inactivity timers and/or DRx activity timers would have to be restarted from a null state, meaning that UEs that move between cells often might never be moved to the appropriate operating conditions.
  • FIG. 1 shows the context transfer within the handover procedure which enables the target eNB to restart timers at the transferred values and set the UE into the correct DRx state.
  • a serving eNB 1 sets a DRx period 2 for a UE 3.
  • the UE sends a measurement report 4 back to the serving eNB.
  • the serving eNB resets the DRx timer 5, 6, whereas the inactivity timer continues to run.7 until the measurement report is received.
  • the serving eNB 1 then sends a Handover Request 8 to a target eNB 9, which replies with a Handover Accede message 10.
  • the serving eNB sends a Handover Command 11 to the UE and a context transfer 12 to the target eNB.
  • the UE 3 has sent a Handover Complete message 13 to the target eNB 9
  • the DRx timer 14 and inactivity timer 15 are restarted and the target eNB 9 sends a set DRx period 16 to the UE 3.

Landscapes

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

Abstract

L'invention concerne un procédé de transfert d'un dispositif utilisateur (3) d'une station de base de service (1) à une station de base (9) cible dans un système de communication, lequel procédé comporte le transfert de la station de base (1) de service à la station de base (9) cible d'un ou plusieurs paramètres portant sur le fonctionnement du dispositif utilisateur (3) avant le transfert.
PCT/EP2008/051409 2007-02-06 2008-02-05 Procédé de transfert WO2008095935A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0702241.1 2007-02-06
GB0702241A GB2447440A (en) 2007-02-06 2007-02-06 Method of handover

Publications (1)

Publication Number Publication Date
WO2008095935A1 true WO2008095935A1 (fr) 2008-08-14

Family

ID=37891369

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/051409 WO2008095935A1 (fr) 2007-02-06 2008-02-05 Procédé de transfert

Country Status (2)

Country Link
GB (1) GB2447440A (fr)
WO (1) WO2008095935A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013110851A1 (fr) * 2012-01-26 2013-08-01 Nokia Corporation Procédé et appareil de mobilité de terminaux mobiles
WO2013155902A1 (fr) * 2012-04-19 2013-10-24 华为技术有限公司 Procédé et dispositif permettant de réduire la signalisation de commutation
WO2017054168A1 (fr) * 2015-09-30 2017-04-06 华为技术有限公司 Procédé pour acquérir des informations de contexte d'un équipement utilisateur, et dispositif et système associés

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005027558A1 (fr) * 2003-09-12 2005-03-24 Ntt Docomo, Inc. Transfert de contextes pour transfert intercellulaire continu
US20050286470A1 (en) * 2004-06-28 2005-12-29 Nokia Corporation Method and apparatus providing context transfer for inter-BS and inter-PCF handoffs in a wireless communication system
WO2006018670A1 (fr) * 2004-08-17 2006-02-23 Nokia Corporation Transfert d'une station mobile

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001268617A (ja) * 2000-03-21 2001-09-28 Mitsubishi Electric Corp 無線通信方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005027558A1 (fr) * 2003-09-12 2005-03-24 Ntt Docomo, Inc. Transfert de contextes pour transfert intercellulaire continu
US20050286470A1 (en) * 2004-06-28 2005-12-29 Nokia Corporation Method and apparatus providing context transfer for inter-BS and inter-PCF handoffs in a wireless communication system
WO2006018670A1 (fr) * 2004-08-17 2006-02-23 Nokia Corporation Transfert d'une station mobile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", 3GPP TS 36.300 V0.4.0 (2007-01) TECHNICAL SPECIFICATION, 31 January 2007 (2007-01-31), XP002480213, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Specs/html-info/36300.htm> [retrieved on 20080514] *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013110851A1 (fr) * 2012-01-26 2013-08-01 Nokia Corporation Procédé et appareil de mobilité de terminaux mobiles
CN104106305A (zh) * 2012-01-26 2014-10-15 诺基亚公司 用于移动终端的移动性的方法和装置
US9693265B2 (en) 2012-01-26 2017-06-27 Nokia Technologies Oy Method and apparatus for mobile terminal mobility
CN104106305B (zh) * 2012-01-26 2018-04-06 诺基亚技术有限公司 用于移动终端的移动性的方法和装置
WO2013155902A1 (fr) * 2012-04-19 2013-10-24 华为技术有限公司 Procédé et dispositif permettant de réduire la signalisation de commutation
US9526033B2 (en) 2012-04-19 2016-12-20 Huawei Technologies Co., Ltd. Method and device for reducing handover signaling
WO2017054168A1 (fr) * 2015-09-30 2017-04-06 华为技术有限公司 Procédé pour acquérir des informations de contexte d'un équipement utilisateur, et dispositif et système associés
US10721657B2 (en) 2015-09-30 2020-07-21 Huawei Technologies Co., Ltd. Method, system, and related device for obtaining user equipment context information

Also Published As

Publication number Publication date
GB0702241D0 (en) 2007-03-14
GB2447440A (en) 2008-09-17

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