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WO2006064391A1 - Procede et appareil utilises dans une procedure de mesure de transfert - Google Patents

Procede et appareil utilises dans une procedure de mesure de transfert Download PDF

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Publication number
WO2006064391A1
WO2006064391A1 PCT/IB2005/054041 IB2005054041W WO2006064391A1 WO 2006064391 A1 WO2006064391 A1 WO 2006064391A1 IB 2005054041 W IB2005054041 W IB 2005054041W WO 2006064391 A1 WO2006064391 A1 WO 2006064391A1
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WO
WIPO (PCT)
Prior art keywords
measurement
handover
handover measurement
parameters
network system
Prior art date
Application number
PCT/IB2005/054041
Other languages
English (en)
Inventor
Ni Ma
Xuejun Zhang
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006064391A1 publication Critical patent/WO2006064391A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements

Definitions

  • the present invention relates generally to a communication method and apparatus, and more particularly, to a method and apparatus for use in handover measurement process.
  • BACKGROUND OF THE INVENTION Handover refers to a procedure by which a UE (user equipment) in initial call setup status or busy status switches to a new traffic channel.
  • GSM900 and GSMl 800 dual-frequency communication system will coexist in the framework of global cellular mobile communication system. Handover, therefore, will play an important role in the framework of future mobile communication systems.
  • Intra- system intra-frequency handover for example, the soft handover within the same communication system and within the same radio carrier frequency band from one cell to another cell in WCDMA or CDMA2000 communication system.
  • TD-SCDMA High Chip Rate - Time Division Duplex wireless communication system
  • TD-SCDMA Low Chip Rate - Time Division Duplex wireless communication system
  • the handover between GSM900 and GSM 1800 in the GSM communication system also belongs to this intra- system inter- frequency handover.
  • Inter-system handover for example, handover among GSM, WCDMA and UTRA
  • a communicating UE In mobile communication, it's decided by the network side whether a communicating UE should perform handover procedure or not. In another word, whether to launch handover procedure or not is decided by the network side based on the measurement report sent from the UE and the measurement results of the network side itself. For example, in CDMA system, when a UE detects that the pilot signal strength over the radio link transferring traffic data is below a certain threshold, it may send a pilot signal strength measurement message to the serving cell, so as to facilitate the network side to make decision about the handover procedure.
  • the network side can notify the UE of testing the signal strength and channel quality of the adjacent cells according to the radio resource utilization of the cell, and decide whether or not to switch to another cell according to the reported measurement results from the UE.
  • Handover in this scenario is also called handover based on traffic balance.
  • Fig.l illustrates the handover measurement process being performed by a moving UE.
  • the network side in the cell where the UE is camping sends an initialized handover measurement instruction to the UE, to notify the UE of the relevant information about its adjacent cells and indicate the UE to measure the signal strength of BCCH of the adjacent cells, and the signal strength and transmission quality of the occupied traffic channel as well.
  • the network side determines whether the UE needs to continue the handover measurement process based on the measurement report, and accordingly indicates the UE to continue or stop handover measurement process.
  • the network side lists and sorts (or namely locates) the channel qualities of the adjacent cells, so as to determine whether to switch, when to switch and to which adjacent cell to switch.
  • the handover measurement parameters used are generally predefined by the system according to the communication standard adopted.
  • the UE performs handover measurement process in every fixed duration, which is preset by the network side according to the communication protocol.
  • the fixed duration is from the starting timeslot for performing a handover measurement to the starting timeslot for performing the next handover measurement, and the time between is also called handover measurement interval.
  • the handover measurement interval can be the time duration of 1 timeslot, or 1 subframe (1 subframe comprises 7 timeslots), or 1 radio frame (1 radio frame comprises 2 subframes), or multiple radio frames.
  • the UE can make use of some spare radio resource (e.g., idle timeslot) or pause reception/transmission for a moment (named as compressed mode), to perform handover measurement over the relevant channels in the serving cell and its adjacent cells.
  • some spare radio resource e.g., idle timeslot
  • pause reception/transmission for a moment named as compressed mode
  • the radio resource for handover measurement is also called handover measurement window.
  • Fig.2 gives an example illustrating a UE performing inter-system handover from TD-SCDMA system to WCDMA system.
  • the UE performs a handover measurement in the duration of 1 subframe, that is, the handover measurement interval is equal to 1 subframe.
  • guard period C DwPTS + GP + UpPTS.
  • UE can capture the pilot signals of the target system (e.g. SCH in WCDMA system or FCCH in GSM system), so as to facilitate UE to obtain the timing of the timeslot and the radio frame in WCDMA system.
  • the target system e.g. SCH in WCDMA system or FCCH in GSM system
  • the UE When the UE performs handover measurement process using the handover measurement parameters shown in Fig.2, if the radio channel of the UE is in good condition, e.g. the UE is moving slowly or the UE is not far away from the central position of the cell, or the UE can easily capture SCH signals of WCDMA, it will facilitate the full utilization of the radio resource to reallocate some radio resource occupied by the handover measurement to be used in carrying traffic data. But in current handover measurement process, even if the radio link status permits, the radio resource occupied by handover measurement can't be reallocated to carry traffic data, thus the number of timeslots for transferring traffic data is obviously restricted in this scenario. Conversely, if the radio channel of the UE is not in good condition, e.g.
  • the UE is moving fast or the channel condition deteriorates seriously or the UE can't capture SCH signals of WCDMA easily, it may be not sufficient for the network side to make the right handover decision with the preset handover measurement parameters (or namely the handover measurement interval and window). It is, therefore, necessary to provide a new method to replace the conventional handover measurement method adopting fixed handover measurement parameters.
  • An object of the present invention is to provide a method for use in handover measurement process, which can make best use of the limited radio resource and improve handover measurement precision.
  • a measurement method to be executed in a UE comprising the steps of: performing a measurement process based on the initialized measurement instruction from a network system; reporting to the network system the measurement results obtained in the measurement process; receiving the measurement parameters generated by the network system based on the measurement results; performing the corresponding measurement process based on the measurement parameters.
  • a measurement method to be executed in a network system comprising the steps of: receiving the measurement results obtained in a measurement process from the UE; generating the corresponding measurement parameters based on the measurement results; sending the measurement parameters to the UE so that the UE can perform corresponding measurement process based on the measurement parameters.
  • a UE comprising: a measuring unit, for performing a measurement process based on the initialized measurement instruction from a network system; a transmitting unit, for reporting to the network system the measurement results obtained in the measurement process; a receiving unit, for receiving the measurement parameters generated by the network system based on the measurement results; wherein the measuring unit performs the corresponding measurement process based on the measurement parameters.
  • a network system comprising: a receiving unit, for receiving the measurement results obtained in a measurement process from the UE; a generating unit, for generating the corresponding measurement parameters based on the measurement results; a transmitting unit, for sending the measurement parameters to the UE so that the UE can perform corresponding measurement process based on the measurement parameters.
  • Fig.l illustrates a schematic diagram of a UE performing handover measurement process
  • Fig.2 illustrates the handover measurement parameters adopted by the conventional UE in performing handover measurement
  • Fig.3 illustrates the flowchart of the method to be executed in the handover measurement process in accordance with an embodiment of the present invention
  • Fig.4 illustrates the handover measurement parameters adopted by the UE in performing handover measurement in accordance with an embodiment of the present invention
  • Fig.5 illustrates the handover measurement parameters adopted by the UE in performing handover measurement in accordance with another embodiment of the present invention
  • Fig.6 illustrates the configurations of the UE and the network system when the method for use in handover measurement process described in the present invention is implemented in hardware.
  • the network side after receiving the handover measurement results reported from the UE, the network side generates the corresponding handover measurement parameters like handover measurement interval and window based on the radio link status and/or traffic load situation, and sends the new handover measurement parameters to the UE. After receiving the new handover measurement parameters, the UE can continue to perform handover measurement process according to the new handover measurement parameters.
  • a UE in TD-SCDMA communication system will be taken as an example below to describe the steps to be completed by the network side and the UE respectively in performing handover measurement process, in conjunction with Fig.3.
  • the network side first determines whether to initiate handover measurement process based on the measurement report sent from the UE and the measurement results of the network itself (step SlO), wherein the measurement report may be, for example, the pilot signal strength of the traffic channel detected by the UE and the measurement results may be, for example, the current traffic load of the UE detected by the network side. If the network side determines to initiate handover measurement process, it sends an initialized handover measurement instruction to the UE (step S20), to notify the UE of the handover measurement indication information such as which adjacent cells to be detected and which parameters of the adjacent cells to be measured, and also the preset handover measurement parameters such as handover measurement interval and window. After receiving the initialized handover measurement instruction (step S30), the UE performs handover measurement process in the preset handover measurement window according to the preset handover measurement interval (step S40), and reports the measurement results to the network side (step S50).
  • the initialized handover measurement instruction step S30
  • the UE performs handover measurement process in the preset hand
  • the network side On receipt of the handover measurement results from the UE (step S60), the network side determines whether to continue handover measurement process or not, according to the current radio link status of the UE reflected by the handover measurement results and the current traffic load condition of the UE learned by the network side (step S70), and generates the corresponding indication information on the relevant handover measurement.
  • step S80 Based on the handover measurement indication information (step S80), if the network side determines to stop the handover measurement process, it sends to the UE the handover measurement instruction containing the indication information on stopping the handover measurement process (step S90), and then the network side terminates the handover measurement process (step SlOO).
  • the network side decides to continue the handover measurement process, it further computes the new handover measurement parameters suitable for the current UE according to the radio link status and traffic load condition (step SIlO). Description will be given below to the procedure of computing the new handover measurement parameters, in conjunction with specific examples.
  • the network side After computing and generating the new handover measurement parameters, the network side sends the handover measurement indication to the UE via downlink, such as downlink control channel or downlink traffic channel (step S 120), the handover measurement indication comprises the indication information on continuing handover measurement process and the new handover measurement parameters.
  • downlink such as downlink control channel or downlink traffic channel
  • step S60 the network side returns to step S60, waiting for the handover measurement report from the UE.
  • the UE On receipt of the handover measurement indication from the network side (step S 130), the UE first determines whether the network side indicates it to stop or continue handover measurement process, based on the indication information relating to handover measurement process included in the handover measurement indication (step S 140).
  • the UE continues to perform handover measurement process in the new handover measurement window, according to the new handover measurement interval, based on the new handover measurement parameters included in the handover measurement indication (step S 150), and then executes subsequent steps. If the received indication indicates to stop handover measurement process, the UE terminates handover measurement process (step S160).
  • the procedures by which the network side lists and sorts the channel qualities of the adjacent cells based on the handover measurement results and determines whether to switch, when to switch and to which adjacent cell to switch, and also the procedures by which the UE performs handover operations based on the network side's decision they are similar to those in conventional handover mode and are not the main object of the present invention, and thus no detailed description is given to them herein.
  • different handover measurement intervals are set in the network side corresponding to different radio link status, such as different SIR (Signal to Interference Ratio) or different BER (Bit-Error-Rate), as shown in Table.1.
  • SIR Signal to Interference Ratio
  • BER Bit-Error-Rate
  • SIR radio link quality
  • T 1 ⁇ dB radio link quality
  • T 2 IOdB
  • the new handover measurement interval can be computed and generated based the following criteria:
  • Table. 1 determine the handover measurement interval based on the measured radio link quality
  • the handover measurement interval can be correspondingly enlarged according to Table.1, to decrease the number of handover measurement.
  • the original radio resource used by handover measurement can be reallocated to carry traffic data.
  • the handover measurement interval can be correspondingly shortened according to Table.1, to increase the number of handover measurement.
  • the above handover measurement interval can be further subdivided based on finer threshold, for example, it can be subdivided to the minimum unit - timeslot of the handover measure interval, which depends on the requirements of the radio system and whether the UE supports finer handover measurement interval.
  • the network side can also adjust the handover measurement window according to the radio link status. Specifically, when the radio link quality is good (for example, the measured SIR is above a predefined value), the timeslots previously belonging to handover measurement window can be reallocated to carry traffic data; when the radio link quality deteriorates (for example, the measured SIR is below a predefined value), the timeslots previously used for carrying traffic data can also be reallocated for use in handover measurement to enhance the handover measurement precision.
  • the radio link quality for example, the measured SIR is above a predefined value
  • the timeslots previously belonging to handover measurement window can be reallocated to carry traffic data
  • the radio link quality deteriorates for example, the measured SIR is below a predefined value
  • the timeslots previously used for carrying traffic data can also be reallocated for use in handover measurement to enhance the handover measurement precision.
  • Fig.4 and Fig.5 illustrate how to adjust the handover measurement interval and how to adjust the handover measurement window respectively in accordance with embodiments of the present invention.
  • the handover measurement interval will be prolonged to the time duration of 2 subframes according to the present invention, as shown in Fig.4.
  • the saved timeslots can be reallocated to transfer traffic data, referring to the timeslots reallocated to receive/transmit data as shown in subframe i (alternatively, the timeslots for handover measurement in subframe i-1 can also be reallocated to receive/transmit data).
  • the handover measurement window can be adjusted, i.e. the timeslots in the subframe previously for carrying traffic data can also be used for handover measurement, referring to timeslot RX in subframe i-1 in Fig.5.
  • handover measurement occupies some radio resource previously used for transferring traffic data, and the data transfer tend to be affected to some extent, but the whole handover precision will be enhanced greatly.
  • the method for use in handover measurement process it can be implemented in software or in hardware, or in combination of both.
  • Fig.6 illustrates the configurations of the UE and network system when the proposed method for use in handover measurement process is implemented in hardware, wherein the components same as those in conventional UE and network system are not given here.
  • handover measurement unit 10 in the UE performs a handover measurement process based on the initialized handover measurement instruction from network system 100, and reports to the network system 100 via transmitting unit 20 the handover measurement results obtained in the handover measurement process.
  • the handover measurement results usually comprise information on the radio link status of the
  • UE such as SIR and/or BER.
  • Receiving unit 110 in network system 100 provides the received handover measurement results from the UE to generating unit 120.
  • Generating unit 120 generates the corresponding handover measurement parameters based on the handover measurement results, and sends the handover measurement parameters to the UE via transmitting unit 130.
  • the handover measurement parameters may comprise handover measurement interval and/or handover measurement window for use in handover measurement process.
  • Receiving unit 30 in the UE provides the received handover measurement parameters from network system 100 to handover measurement unit 10, so that handover measurement unit 10 can perform the corresponding handover measurement process based on the handover measurement parameters.
  • the network side can adjust handover measurement parameters such as handover measurement interval and window based on the current radio link status reflected by the handover measurement results from the UE and/or the current traffic load condition of the UE, and send the new handover measurement parameters to the UE so that the UE can continue to perform handover measurement process according to the new handover measurement parameters. Therefore, the present invention can take full advantage of the limited radio resource and improve the handover measurement precision effectively.
  • the proposed method for use in handover measurement process is particularly suitable for inter-system handover measurement process from high-speed data rate system to low speed data rate system, due to good balance of between resource occupation and traffic load status.
  • the proposed method for adaptively changing handover measurement interval and window in handover measurement process is not only suitable for handover measurement process, but also equally applied in the occasions where measurement is needed, such as cell selection/reselection, DCA, timing in advance.

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

Abstract

L'invention concerne un procédé de mesure mis en oeuvre dans un équipement d'utilisateur (UE), consistant à exécuter une procédure de mesure basée sur l'instruction de mesure initialisée par un système de réseau, à rapporter au système de réseau les résultats de la mesure obtenus au cours de la procédure de mesure, à recevoir les paramètres de mesure générés par le système de réseau basé sur les résultats de la mesure, et à exécuter une procédure de mesure correspondante basée sur les paramètres de mesure.
PCT/IB2005/054041 2004-12-13 2005-12-05 Procede et appareil utilises dans une procedure de mesure de transfert WO2006064391A1 (fr)

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CN200410102121 2004-12-13

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7787845B2 (en) 2007-09-17 2010-08-31 Telefonaktiebolaget Lm Ericsson (Publ) UE measurement scheduling based on measurement bandwidth
WO2011034637A1 (fr) * 2009-09-18 2011-03-24 Qualcomm Incorporated Procédé et appareil pour faciliter des communications en mode compressé
WO2011087518A1 (fr) * 2010-01-15 2011-07-21 Qualcomm Incorporated Utilisation d'une période de temps continue en td-scdma pour faciliter un transfert intercellulaire radio de td-scdma en gsm
WO2011150252A1 (fr) * 2010-05-26 2011-12-01 Qualcomm Incorporated Transfert inter-technologie d'accès radio (inter-rat) basé sur des services
WO2012031619A1 (fr) * 2010-09-06 2012-03-15 Nokia Siemens Networks Oy Appareil et procédé de communication
WO2013130900A1 (fr) * 2012-02-28 2013-09-06 Qualcomm Incorporated Procédé et appareil de mesure irat en mode connecté td-scdma
WO2013130903A1 (fr) * 2012-02-28 2013-09-06 Qualcomm Incorporated Procédé de mesure de technologie d'accès inter-radio (irat) dans un mode connecté avec un accès td-scdma
EP2395704B1 (fr) * 2009-02-03 2020-01-15 ZTE Corporation Procédé et système pour implémenter une mesure
WO2025030104A1 (fr) * 2023-08-02 2025-02-06 Interdigital Patent Holdings, Inc. Fenêtre d'exécution de transfert de mobilité à déclenchement de couche inférieure réglable

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP1081979A1 (fr) * 1999-08-31 2001-03-07 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Dispositif d'abonné, moyens de commande de réseau et méthode de déclenchement des mesures d'inter-fréquence dans un système de communication mobile
EP1117269A1 (fr) * 2000-01-13 2001-07-18 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Procédé et dispositifs pour procédures de commutation associée améliorées dans des systèmes de communication mobile
US20020049058A1 (en) * 2000-10-23 2002-04-25 Tee Lai King Enhancement of soft handoff in a mobile wireless network through the use of dynamic information feedback from mobile users

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1081979A1 (fr) * 1999-08-31 2001-03-07 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Dispositif d'abonné, moyens de commande de réseau et méthode de déclenchement des mesures d'inter-fréquence dans un système de communication mobile
EP1117269A1 (fr) * 2000-01-13 2001-07-18 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Procédé et dispositifs pour procédures de commutation associée améliorées dans des systèmes de communication mobile
US20020049058A1 (en) * 2000-10-23 2002-04-25 Tee Lai King Enhancement of soft handoff in a mobile wireless network through the use of dynamic information feedback from mobile users

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7787845B2 (en) 2007-09-17 2010-08-31 Telefonaktiebolaget Lm Ericsson (Publ) UE measurement scheduling based on measurement bandwidth
EP2395704B1 (fr) * 2009-02-03 2020-01-15 ZTE Corporation Procédé et système pour implémenter une mesure
WO2011034637A1 (fr) * 2009-09-18 2011-03-24 Qualcomm Incorporated Procédé et appareil pour faciliter des communications en mode compressé
CN102204341A (zh) * 2009-09-18 2011-09-28 高通股份有限公司 用于促成压缩模式通信的方法和装置
WO2011087518A1 (fr) * 2010-01-15 2011-07-21 Qualcomm Incorporated Utilisation d'une période de temps continue en td-scdma pour faciliter un transfert intercellulaire radio de td-scdma en gsm
WO2011150252A1 (fr) * 2010-05-26 2011-12-01 Qualcomm Incorporated Transfert inter-technologie d'accès radio (inter-rat) basé sur des services
US8792365B2 (en) 2010-05-26 2014-07-29 Qualcomm Incorporated Service-based inter-radio access technology (inter-RAT) handover
WO2012031619A1 (fr) * 2010-09-06 2012-03-15 Nokia Siemens Networks Oy Appareil et procédé de communication
WO2013130900A1 (fr) * 2012-02-28 2013-09-06 Qualcomm Incorporated Procédé et appareil de mesure irat en mode connecté td-scdma
WO2013130903A1 (fr) * 2012-02-28 2013-09-06 Qualcomm Incorporated Procédé de mesure de technologie d'accès inter-radio (irat) dans un mode connecté avec un accès td-scdma
CN104137607A (zh) * 2012-02-28 2014-11-05 高通股份有限公司 用于在处于td-scdma连通模式时进行irat测量的方法和装置
WO2025030104A1 (fr) * 2023-08-02 2025-02-06 Interdigital Patent Holdings, Inc. Fenêtre d'exécution de transfert de mobilité à déclenchement de couche inférieure réglable

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