WO2012119475A1 - Procédé et dispositif de transfert de terminal - Google Patents

Procédé et dispositif de transfert de terminal Download PDF

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Publication number
WO2012119475A1
WO2012119475A1 PCT/CN2011/084667 CN2011084667W WO2012119475A1 WO 2012119475 A1 WO2012119475 A1 WO 2012119475A1 CN 2011084667 W CN2011084667 W CN 2011084667W WO 2012119475 A1 WO2012119475 A1 WO 2012119475A1
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WO
WIPO (PCT)
Prior art keywords
terminal
access device
wireless access
handover
threshold
Prior art date
Application number
PCT/CN2011/084667
Other languages
English (en)
Chinese (zh)
Inventor
陈琳
韩立锋
奚进
毛磊
张银成
Original Assignee
中兴通讯股份有限公司
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
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012119475A1 publication Critical patent/WO2012119475A1/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 to the field of wireless communication technologies, and in particular, to a method and an apparatus for terminal handover in a wireless access system. Background technique
  • the mobile data services mainly occur in indoor and hotspot environments, which are reflected in nomadic/local wireless access scenarios.
  • the characteristics of the indoor and hotspot data services are that the users usually have fixed or very low-speed mobility, and the mobility requirements are not high.
  • the data services are mainly IP-based Internet Internet services, and the requirements for quality of service (QoS) are relatively simple, and Far less than the QoS requirements of carrier-class services.
  • QoS quality of service
  • the traditional cellular mobile communication system is mainly designed for high-speed mobile, seamless switching carrier-class service design. When it carries large-flow and low-speed IP data packet services, the efficiency is low and the cost is too high. How to meet the huge demand for indoor data services in the future has become a major challenge for cellular mobile communication systems. Cellular mobile operators are eager to find low-cost, high-throughput solutions for nomadic/local wireless data access.
  • LTE Long Term Evolution
  • the main purpose of the present invention is to provide a terminal handover method and device for a nomadic/local wireless access scenario, which is used to solve the complexity and efficiency of the existing handover method in a nomadic/local wireless data access scenario. Low, technical problem that cannot be initiated by the terminal.
  • a method for terminal handover comprising:
  • the terminal determines, according to the measurement threshold, whether the signal quality of the neighboring wireless access device needs to be measured. When the signal quality of the serving cell is less than the measurement threshold, the signal quality of the neighboring wireless access device is measured.
  • the terminal determines whether the handover needs to be performed according to the handover threshold. When the signal quality of the neighboring radio access device is greater than the handover threshold, the terminal initiates a handover procedure to the neighboring radio access device.
  • the method further includes:
  • the radio access device to which the serving cell belongs sends the measurement threshold and the handover threshold to the terminal, where the terminal receives and saves the measurement threshold and the handover threshold; or the measurement
  • the threshold and the switching threshold are the measurement thresholds and switching thresholds set by the terminal by default.
  • the wireless access device sends the measurement threshold and the switching threshold to all terminals in the service range by using a system broadcast manner, or sends the measurement threshold and the handover threshold to the terminal through dedicated signaling according to the capability of the terminal.
  • the method further includes:
  • the terminal obtains information of a neighboring wireless access device by scanning, and performs signal quality measurement on the scanned neighboring wireless access device;
  • the terminal sends, by the wireless access device to which the serving cell belongs, the neighboring wireless access device to the terminal Information, the terminal performs signal quality measurement on the neighboring wireless access device according to the received information of the neighboring wireless access device;
  • the terminal determines, according to the measurement result of the neighboring wireless access device, whether the signal quality of the neighboring wireless access device is greater than the handover threshold, and if greater, the neighboring wireless access device whose signal quality is greater than the handover threshold Select one as the target wireless access device, otherwise do not make a choice.
  • the wireless access device sends the information of the neighboring wireless access device to all terminals in the service range by means of system broadcast, or the adjacent wireless by using proprietary signaling according to the capability of the terminal.
  • the information of the access device is sent to the terminal.
  • the method for the terminal to initiate a handover procedure to a neighboring wireless access device is: the terminal initiates a process of leaving the current serving cell, and releases the related context;
  • the terminal initiates an access process and accesses the neighboring wireless access device.
  • the present invention further provides a device for terminal handover, including a terminal and a wireless access device, where the terminal includes a measurement module, an acquisition module, a handover determination module, and a handover module;
  • a measurement module configured to measure a signal quality of the serving cell, and determine whether a signal quality of the serving cell is less than a measurement threshold, and when a signal quality of the serving cell is less than a measurement threshold, measure a signal quality of the neighboring wireless access device;
  • An acquiring module configured to acquire a measurement threshold, a switching threshold, and/or a message switching judging module of a neighboring radio access device, where the signal quality of the serving cell is less than a measurement threshold, according to a signal quality of the neighboring radio access device
  • the measurement result determines whether the signal quality of the neighboring wireless access device is greater than a handover threshold
  • the switching module is configured to initiate a handover process to the neighboring wireless access device when the signal quality of the neighboring wireless access device is greater than the handover threshold.
  • the wireless access device includes:
  • a sending module configured to send a measurement threshold and a handover threshold to the terminal when the terminal accesses the serving cell, and/or send information about the neighboring wireless access device
  • the access module is configured to respond to the handover process initiated by the terminal, perform terminal context release, and complete an access procedure of the terminal to the target wireless access device.
  • the measurement threshold and the handover threshold acquired by the acquiring module are sent by the serving cell to the acquiring module, or the obtaining module obtains a default value locally.
  • the terminal is always in the connected state, and the signal quality of the serving cell is measured by the measurement threshold configured by itself or the network. If the signal quality of the serving cell is lower than the measurement threshold, it is determined according to the information of the neighboring wireless access device.
  • the handover is required. If the target cell signal quality is higher than the handover threshold, the terminal actively accesses the target cell and releases the context of the source cell.
  • the invention improves the handover process of the terminal, makes the state change of the terminal simpler, reduces the implementation cost of the wireless access device, and better satisfies the requirements of the nomadic/local wireless data access scenario.
  • Figure 1 is a network topology diagram of a wireless access system
  • FIG. 2 is a flowchart of performing, by a terminal according to a measurement threshold and a handover threshold sent by a radio access device, that is, a measurement threshold and a handover threshold, according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of a method in which a terminal performs measurement according to a default measurement threshold and a handover threshold and initiates handover according to Embodiment 2 of the present invention
  • FIG. 4 is a flowchart of a process for initiating measurement and handover after a terminal fails to discover a link with a wireless access device according to Embodiment 3 of the present invention. detailed description
  • This embodiment is a process in which the terminal performs measurement and initiates handover according to the measurement threshold and the handover threshold sent by the radio access device, that is, the base station.
  • Step 201 The terminal A enters the service area of the wireless access device A, initiates an access request, and accesses the wireless access device A. After the terminal A completes the access, the wireless access device A sends the measurement threshold and the switching threshold. Terminal A;
  • the wireless access device may send the measurement threshold and the handover threshold to all terminals in the service range by means of system broadcast, or may send the measurement threshold and the handover threshold to the terminal through dedicated signaling according to the capability of the terminal.
  • Step 202 After receiving the measurement threshold and the switching threshold sent by the wireless access device A, the terminal A saves it locally.
  • Step 203 The terminal A moves to the coverage edge of the wireless access device A in the service area of the wireless access device A.
  • the terminal A detects that the signal quality of the wireless access device A is less than the measurement threshold, the terminal A initiates Scanning the wireless access device in the neighboring area to detect whether there is a neighboring wireless access device by scanning, and if so, measuring the signal quality of the neighboring wireless access device;
  • Step 204 If the terminal A scans that there is a neighboring wireless access device, if the terminal A scans to the wireless access device B, it is determined whether the measured signal quality of the neighboring wireless access device B is greater than a handover threshold. If the threshold is greater than the handover threshold, the terminal uses the neighboring wireless access device B as the target wireless access device and initiates the handover. If terminal A simultaneously measures that the signal quality of multiple adjacent wireless access devices is greater than the handover threshold, the terminal selects a most suitable neighboring wireless access device as the target wireless access device and initiates handover.
  • Step 205 In the handover process, the terminal A first initiates a process of leaving the wireless access device A, and the wireless access device A and the core network element connected to the wireless access device A are related to the terminal A. The context information is released, and then terminal A initiates an access procedure and accesses to the wireless access device B.
  • Example 2
  • This embodiment is a process in which the terminal performs measurement according to a default measurement threshold and a handover threshold and initiates a handover. The following describes the process in conjunction with FIG. 3:
  • Step 301 The terminal A enters the service area of the wireless access device A, and initiates access to the wireless access device A.
  • the wireless access device A optionally sends the information of the neighboring wireless access device.
  • the wireless access device may be sent by means of system broadcast, or the information of the neighboring wireless access device may be sent to the terminal by using dedicated signaling; the information of the adjacent wireless access device includes at least wireless access Information such as device identification, access parameters (such as frequency points of adjacent cells, bandwidth, etc.).
  • Step S302 If the terminal A receives the information of the neighboring wireless access device sent by the wireless access device A, it saves it locally.
  • Step S303 The terminal A moves to the coverage edge of the wireless access device A in the service area of the wireless access device A.
  • the terminal A detects that the signal quality of the wireless access device A is smaller than the measurement threshold set by the terminal A by default, the terminal A may initiate measurement of the neighboring area wireless access device according to the saved information of the neighboring wireless access device.
  • Step S304 If the information of the neighboring wireless access device of the terminal A includes the wireless access device B, determine whether the measured signal quality of the neighboring wireless access device B is greater than a handover threshold. If the threshold is greater than the handover threshold, the terminal A The neighboring wireless access device B acts as the target wireless access device and initiates a handover. If terminal A simultaneously measures that the signal quality of multiple neighboring wireless access devices is greater than the handover threshold, the terminal selects a most suitable neighboring wireless access device as the target wireless access device and initiates handover.
  • Step S305 In the handover process, the terminal A first initiates a process of leaving the wireless access device A, and the wireless access device A and the core network element connected to the wireless access device A delete the context information related to the terminal A, and then the terminal A initiates an access procedure and accesses to the wireless access device B.
  • Example 3
  • This embodiment is a processing flowchart for initiating measurement and handover after the terminal discovers that the link fails with the wireless access device, and the specific steps are described in detail in conjunction with FIG. 4;
  • Step 401 The terminal A enters the service area of the wireless access device A, and initiates access to the wireless access device A. After the terminal A completes the access, the wireless access device sends the measurement threshold and the switching threshold to the terminal and/or the sending phase. The information of the neighboring wireless access device is sent to the terminal A.
  • the wireless access device may send the measurement threshold, the switching threshold, and/or the information of the neighboring wireless access device to all terminals in the service range by means of system broadcast, or according to The capability of the terminal transmits the measurement threshold and the handover threshold and/or information of the neighboring wireless access device to the terminal through dedicated signaling.
  • Step 402 After receiving the measurement threshold and the handover threshold sent by the wireless access device A and/or the information of the neighboring wireless access device, the terminal A saves the information locally;
  • Step 403 The terminal A detects that the link with the radio access device A fails when the radio accesses the service area of the device A, and the terminal A initiates scanning of the neighboring cell radio access device.
  • Step 404 If the terminal A scans to the wireless access device B at this time, it is determined whether the measured signal quality of the neighboring wireless access device B is greater than the received switching threshold or the default switching threshold set by the terminal A, if greater than When the threshold is switched, the terminal uses the neighboring wireless access device B as the target wireless access device and initiates the handover. If terminal A simultaneously measures that the signal quality of multiple adjacent wireless access devices is greater than the handover threshold, the terminal selects a most suitable neighboring wireless access device as the target wireless access device and initiates handover.
  • Step 405 Here, terminal A directly initiates access to the wireless access device B during the handover process.
  • the context associated with terminal A that remains in radio access device A can be handled by the wireless radio access device itself.
  • This embodiment provides a device for terminal handover based on the foregoing embodiment, and the device 500 includes: a measurement module 501, an acquisition module 502, a handover determination module 503, a handover module 504, and a transmission module 510 and an access module 511 located in the wireless access device;
  • the measuring module 501 is configured to measure the signal quality of the server cell, and determine whether the signal quality of the serving cell is smaller than the measurement threshold, and when the signal quality of the serving cell is less than the measurement threshold, measure the neighboring wireless access device;
  • the obtaining module 502 is configured to obtain the measurement threshold, the handover threshold, and/or the information of the neighboring wireless access device.
  • the measurement threshold and the handover threshold are obtained by the acquiring module 502 when the terminal accesses the serving cell, or The acquiring module 502 obtains the measurement threshold and the switching threshold set by the terminal from the local.
  • the handover determining module 503 is configured to determine, according to the measurement result of the signal quality of the neighboring wireless access device, whether the signal quality of the neighboring wireless access device is greater than a handover threshold, when the signal quality of the serving cell is less than the measurement threshold;
  • the switching module 504 is configured to initiate a handover procedure to the neighboring wireless access device when the signal quality of the neighboring wireless access device is greater than the handover threshold.
  • the sending module 510 is configured to send a measurement threshold and a handover threshold to the terminal when the terminal accesses the serving cell, and/or send information about the neighboring wireless access device;
  • the access module 511 is configured to respond to the handover process initiated by the terminal, perform the release of the source wireless access device, and complete the access process of the terminal to the local end.
  • the modules included in the device are all configured to implement the steps in the foregoing method embodiments, and the functions thereof can be directly derived from the foregoing method embodiments, and any The functional modules or the execution units that are abstracted, extracted, or deduced in the method embodiments should be within the protection scope of the device embodiments of the present invention. To save space, no further details are provided herein.
  • the invention improves the handover process of the terminal, makes the state change of the terminal simpler, reduces the implementation cost of the wireless access device, and better satisfies the requirements of the nomadic/local wireless data access scenario.

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

Abstract

La présente invention concerne un procédé et un dispositif de transfert de terminal dans un scénario d'accès sans fil local/d'itinérance, qui sont utilisés pour résoudre les problèmes techniques dans le scénario d'accès sans fil local/d'itinérance, en ce que le procédé de transfert classique a une procédure de mise en œuvre complexe et une faible efficacité, et en ce que le transfert ne peut pas être initié par un terminal. La solution technique proposée est la suivante : un terminal qui est toujours dans l'état connecté effectue une mesure de qualité de signal d'une cellule de desserte au moyen d'un seuil de mesure configuré par le terminal ou un réseau ; si la qualité du signal de la cellule de desserte est inférieure au seuil de mesure, le terminal détermine, selon des informations d'un dispositif d'accès sans fil adjacent, si un transfert doit ou non être effectué ; si la qualité du signal d'une cellule cible est supérieure à un seuil de transfert, le terminal effectue activement un accès dans la cellule cible, et libère en même temps le contexte d'une cellule source. La présente invention permet ainsi d'améliorer le flux de transfert du terminal, de simplifier le changement d'état du terminal, et de réduire le coût de mise en œuvre du dispositif d'accès sans fil, répondant ainsi mieux au besoin du scénario d'accès aux données sans fil local/d'itinérance.
PCT/CN2011/084667 2011-03-10 2011-12-26 Procédé et dispositif de transfert de terminal WO2012119475A1 (fr)

Applications Claiming Priority (2)

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CN201110058771.2 2011-03-10
CN2011100587712A CN102685837A (zh) 2011-03-10 2011-03-10 一种终端切换的方法及系统

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Cited By (1)

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US10187829B2 (en) 2012-10-19 2019-01-22 Fujitsu Connected Technologies Limited Method and apparatus for cell handover and reconfiguration

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WO2014101071A1 (fr) * 2012-12-27 2014-07-03 华为技术有限公司 Procédé et dispositif de commutation
CN103501507B (zh) * 2013-09-05 2017-08-15 小米科技有限责任公司 一种自动切换无线信号的方法及终端
CN109640365B (zh) * 2018-12-27 2021-09-07 中国联合网络通信集团有限公司 小区的切换方法、装置及存储介质

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CN101730164A (zh) * 2008-10-17 2010-06-09 上海华为技术有限公司 一种小区重选的方法及终端
CN101742598A (zh) * 2008-11-07 2010-06-16 中兴通讯股份有限公司 家庭基站小区重选方法和装置

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CN101651961A (zh) * 2008-08-11 2010-02-17 华为技术有限公司 小区重选的方法和终端
CN101730164A (zh) * 2008-10-17 2010-06-09 上海华为技术有限公司 一种小区重选的方法及终端
CN101742598A (zh) * 2008-11-07 2010-06-16 中兴通讯股份有限公司 家庭基站小区重选方法和装置

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