WO2008148314A1 - Procédé de transfert et système et station mobile associés - Google Patents

Procédé de transfert et système et station mobile associés Download PDF

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Publication number
WO2008148314A1
WO2008148314A1 PCT/CN2008/070602 CN2008070602W WO2008148314A1 WO 2008148314 A1 WO2008148314 A1 WO 2008148314A1 CN 2008070602 W CN2008070602 W CN 2008070602W WO 2008148314 A1 WO2008148314 A1 WO 2008148314A1
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WO
WIPO (PCT)
Prior art keywords
base station
transceiver
service link
handover
mobile station
Prior art date
Application number
PCT/CN2008/070602
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English (en)
Chinese (zh)
Inventor
Shengqiang Yang
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008148314A1 publication Critical patent/WO2008148314A1/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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports

Definitions

  • the present invention relates to the field of wireless access, and in particular, to a method and system for handover and a mobile station (MS).
  • MS mobile station
  • the wireless cellular network system mainly includes a mobile station (MS), a base station (BS), a mobile switching center (MSC), an external network, and functional entities responsible for mobility management.
  • the main function of the MS is to terminate the propagation path of the radio wave at the user end, and to ensure that the user can obtain the service through the network, which is connected with the BS through the Um interface; the main function of the BS is to end the radio wave propagation path and connect to the MSC.
  • the interface between the MSC and the MSC is the A interface; the MSC is responsible for the conversion of the service between the wireless network user and the wired network or other wireless network; the functional entity responsible for the mobility management mainly performs the mobility management of the MS, which mainly includes the home location.
  • the register (HLR), the visitor location register (VLR), and the authentication center (AC), etc.; and the external network mainly refers to the Public Switched Telephone Network (PSTN) and the Integrated Services Digital Network (ISDN) and the like.
  • PSTN Public Switch
  • the BS is often split and installed in a base station controller (BSC) and a base transceiver station (BTS).
  • BSC base station controller
  • BTS base transceiver station
  • the BTS is composed of one or more transceivers arranged at the same location, which end the radio wave propagation path at the network end
  • the BSC is a system for managing and controlling one or more BTSs, between the BTS and the BSC
  • the interface is an Abis interface.
  • a BSC and one or more BTSs managed and controlled by it form a base station (BS).
  • the MS can roam freely.
  • the source base station (BS) coverage beyond the original access is exceeded, and other target BS coverage is required.
  • the MS is connected to the target BS by switching, and the user's call is kept uninterrupted.
  • the method for hard handover provided by the wireless cellular mobile network is: when the MS moves, it detects that the source BS signal has deteriorated to a certain threshold or detects a stronger and better signal of a new BS, and then reports it to the source.
  • the source BS needs to perform a hard handover according to a certain algorithm, and generates a handover application message to send
  • the mobile switching center (MSC) the MSC instructs the MS to perform handover, interrupts communication with the source BS, and attempts to establish a service connection with the target BS.
  • the hard handover is a "break-before-make" switching mode.
  • the hard-switching mode is versatile and suitable for various wireless cellular mobile network systems, and even switching between different wireless network systems.
  • the wireless air interface connection time between the MS and the new BS ie, the target BS
  • there is a significant connection interruption which leads to a decrease in service quality.
  • the instability of the wireless air interface signal after the handover The reliability of the successful establishment of the wireless air interface service link with the new BS is not high. If the service link cannot be established successfully with the new BS, the call drop is directly caused, resulting in a high rate of hard handover call drop.
  • the embodiment of the invention provides a method and system for switching and an MS, which has strong versatility, ensures continuity of communication, and effectively improves communication quality.
  • the embodiment of the present invention provides a method for handover.
  • the first service link is established between the source base station and the first transceiver of the mobile station, and includes the following steps:
  • a handover command is sent to instruct the mobile station to switch to the second service link.
  • the embodiment of the present invention further provides a method for switching, and a first service link is established between the source base station and the first transceiver of the mobile station, including the following steps:
  • the target base station uses the first transceiver, sending a handover request message to the target base station, requesting to establish a second service link between the target base station and the mobile station;
  • the target base station does not use the first transceiver, sending an assignment request to the target base station, requesting to establish a second service link between the target base station and the second transceiver of the mobile station, where the second service link includes an air interface
  • the sending handover command instructs the mobile station to switch to the second service link.
  • the embodiment of the invention further provides a method for switching, and a first industry has been established between the source base station and the first transceiver. Road, including the following steps:
  • the target base station After the target base station receives the assignment request according to the handover request, establishing a second service link between the second transceiver and the target base station;
  • the mobile switching center After receiving the message of the completion of the service link, the mobile switching center switches to the second service link according to a handover command from the mobile switching center.
  • the embodiment of the invention further provides a mobile station, including:
  • control unit configured to send a control signal and a switching signal
  • Two or more transceivers are respectively configured to establish a service link with the base station according to a control signal from the control unit;
  • a switching connection unit configured to control the service to be connected to the service link of the designated transceiver according to the switching signal from the control unit.
  • the embodiment of the present invention further provides a system for switching, and a first service link is established between the source base station and the first transceiver of the mobile station, including:
  • a source base station configured to generate a handover request
  • a mobile switching center configured to send an assignment request according to a handover request from the source base station, and send a handover command; and release a service link between the source base station and the MS after the handover is completed;
  • a target base station configured to establish a second service link with the second transceiver of the mobile station according to the assignment request from the mobile switching center, and feed back a service link completion message.
  • the method and system for switching according to the embodiment of the present invention establish an air interface service link between the target BS and the second transceiver of the MS before the handover command is sent, so that the call link can be directly switched to the second transceiver.
  • the switching interruption time is greatly reduced, and the problem of dropped calls during the switching process due to the instability of the air interface signal is effectively avoided, the continuity of the communication is ensured, and the communication quality is effectively improved.
  • the MS has multiple transceivers, and each transceiver is in a working state at the same time, and is independent of each other, and can establish a service link with the base station respectively.
  • the call link is directly connected. It is connected to the designated transceiver to complete the hard handover of the mobile station, without waiting for the connection of the air interface service link, greatly reducing the switching interruption time, and effectively avoiding the instability of the air interface signal.
  • the problem that causes the call drop during the handover process ensures the continuity of the communication and effectively improves the communication quality.
  • FIG. 1 is a flowchart of a method for switching in an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a system for switching in an embodiment of the present invention.
  • the wireless air interface service link is established in advance during the hard handover process, which not only greatly reduces the hard handover interruption time, but also effectively avoids the problem of dropped calls during the hard handover process due to the instability of the wireless air interface signal, and ensures The continuity of communication effectively improves communication quality.
  • the improved hard handover method of the embodiment of the present invention is highly versatile and is suitable for switching between various wireless cellular mobile network systems and even different wireless network systems.
  • the first service link is established between the source BS and the MS, and the method for switching, as shown in FIG. 1 , includes the following steps:
  • the MSC receives the handover request of the source BS;
  • the MSC sends an assignment request to the target BS according to the handover request, and requests the target BS to establish a second service link with the MS, where the second service link includes an air interface service link;
  • the MS receives the handover command and switches to the second service link.
  • the step of transmitting the handover command includes: transmitting the handover command only to the source BS, or transmitting the handover command only to the target BS, or simultaneously transmitting the handover command to the source BS and the target BS. At the same time, to the source, the handover command is sent to the target BS, and the reliability of the MS received message can be increased.
  • the above first service link is established between the source BS and the first transceiver of the MS.
  • the source BS sends a handover request according to the signal measurement result reported by the MS.
  • the MS can use the first transceiver to perform frequency signal search and measurement, and report the signal measurement result to the source BS.
  • the MS can also perform frequency signal search and measurement with a transceiver other than the first transceiver, such as a second transceiver, and report the signal measurement result to the source BS through the first transceiver.
  • a transceiver other than the first transceiver such as a second transceiver
  • the above second service link is specifically established between the target BS and the second transceiver of the MS.
  • the modes of the first transceiver and the second transceiver may be the same, and the modes of the first transceiver and the second transceiver are the same, for example, all of the GSM can be switched in the GSM system; or both are CDMA, Switching within a CDMA system; or both WCDMA, can be switched within a WCDMA system.
  • the modes of the first transceiver and the second transceiver can also be different, and switching can be implemented in various systems to further improve the versatility of mobile station switching.
  • the first transceiver is a second generation CDMA transceiver and the second transceiver is a third generation CDMA transceiver
  • a hard handover between the second generation CDMA and the third generation CDMA system can be implemented
  • the first transceiver is CDMA
  • the second transceiver is a GSM transceiver, and can implement hard handover between the CDMA and GSM systems
  • the first transceiver is a CDMA transceiver and the second transceiver is a WCDMA transceiver
  • the CDMA and WCDMA systems can be implemented. Hard switching between.
  • the message that the handover is completed is reported to the MSC; after receiving the message that the handover is completed, the MSC clears the first service link between the source BS and the MS.
  • Each transceiver in the above MS is in a working state at the same time, and is independent of each other, and the first transceiver is in a call state with the source BS, and other transceivers perform signal search and measurement in real time, and the MS finds that the transceiver reports the measurement.
  • the cell list information of the signal that is better than the source BS is reported to the source BS through the first transceiver, and the source BS carries the cell list information reported by the MS in the handover request message and reports
  • the MSC selects a cell carrier frequency as the handover target, and the MSC sends an assignment request to the target BS corresponding to the selected cell carrier frequency, thereby establishing a second of the target BS to another transceiver of the MS (for example, the second transceiver).
  • Service link which includes air interface service links. After the second service link is successfully established, the MSC sends a handover command to the MS, and the MS switches the call link to the second service link.
  • the mobile station can avoid the call drop in the hard handover process, and support the hard handover between the different frequencies and the hard handover between different bands, which can be applied to various wireless cellular mobile network systems and Different modes and different wireless network systems.
  • Embodiment 2 is described with an MS equipped with a first CDMA transceiver and a second CDMA transceiver. The case where equipped with other standard transceiver devices and equipped with more than two transceivers can be understood and implemented based on the idea of the present embodiment.
  • FIG. 2 it is a method for switching in this embodiment:
  • the source BS proposes to perform a hard handover to the target cell, and the source BS sends a handover request message with the cell list to the MSC.
  • the MS report in step 201 newly supports the common transceiver flag cell, and the handover request message also adds support for the common transceiver flag cell.
  • a common transceiver identifier is added to each element of the cell list: 1 indicates that the handover target cell and the current call link share a mobile station transceiver; 0 indicates that the handover target cell does not share the mobile station with the current call link. transceiver.
  • the MSC receives the handover request message, determines whether there is a support common transceiver identifier cell in the message, and sends a handover request message to the target BS if the common transceiver identifier cell or the common transceiver identifier cell indicates the common transceiver Performing a hard handover according to steps 102-114; if the common transceiver flag cell indicates a non-co-transceiver, sending an assignment request message to the target BS, indicating that the target BS establishes a connection with the second transceiver of the MS.
  • the target BS After receiving the assignment request message of the MSC, the target BS sends a channel assignment message to the MS, and uses a standard air interface channel assignment process to complete a service link between the target BS and the second transceiver of the MS.
  • the MS returns a TCH preamble response through the second transceiver.
  • the target BS sends a BS acknowledgment command with a layer 2 acknowledgment request to the MS on the forward traffic channel.
  • the MS After receiving the BS acknowledgment command, the MS transmits the MS acknowledgment command through the second transceiver and transmits the empty traffic channel data TCH data on the reverse traffic channel.
  • the target BS sends a service connection message to the MS to specify a service configuration for the call, and the MS starts specifying the service configuration to process the service at the second transceiver.
  • the MS After receiving the service connection message, the MS responds to the service connection completion message through the second transceiver.
  • the air interface service link between the target BS and the second transceiver of the MS is established. If the target BS ground link is established and fully interworking, the target BS sends an assignment completion message to the MSC.
  • the MSC prepares a handover from the source BS to the target BS, and simultaneously sends a handover command to the source BS and the target BS.
  • sending a handover command message from multiple BSs at the same time will increase the MS receiving the message.
  • the two steps are parallel. Subsequent messages can be sent on both service links at the same time, improving the reliability of the message.
  • the source BS and the target BS send an extended or general handover instruction message to the MS over the air interface.
  • the MS sends an MS acknowledgment command to the source BS or the target BS.
  • control unit of the MS switches the call link from the first transceiver to the second transceiver, and simultaneously sends a handover complete message to the source BS and the target BS.
  • the source BS or target BS sends a BS acknowledgment command to the MS.
  • the source BS or the target BS that received the handover complete message sends a handover complete message to the MSC, notifying the MSC that the MS has successfully completed the hard handover.
  • the MSC sends a clear command message to the source BS.
  • the source BS After the source BS releases the first service link with the first transceiver of the MS and releases its own terrestrial circuit and resources, it sends a Clear Complete message to the MSC to inform the MSC that the clearing process has been completed.
  • the corresponding switching system is set on the hardware, see FIG. 3, the source.
  • a first service link has been established between the BS and the first transceiver of the MS, including:
  • a source BS configured to generate a handover request
  • the MSC is configured to send a handover request according to the handover request, and send a handover command; and release the service link between the source BS and the MS after the handover is completed;
  • a target BS configured to establish a second service link with the second transceiver of the MSC according to the assignment request, and feed back a service link completion message
  • the MS is configured to switch to the second service link according to the handover command.
  • MS includes:
  • control unit configured to send a control signal and a switching signal
  • Two or more transceivers for establishing a service link with the BS according to the control signal Two or more transceivers for establishing a service link with the BS according to the control signal
  • the switching connection unit is configured to control the service to connect to the service link of the designated transceiver according to the switching signal.
  • the MS includes a first transceiver and a second transceiver.
  • MS's second transceiver package A search and measurement unit for frequency signal search and measurement.
  • the control unit can be directly used as an input/output device, or a user interface can be additionally provided to provide input and output devices.
  • the user can set the working mode and search frequency parameters of each transceiver through the user interface, and select the transceiver of the current call.
  • the control bus transmits signaling messages and control commands;
  • the data bus transmits service data, such as voice packets, data packets.
  • the control unit of the MS controls the multi-transceiver to perform frequency signal search and measurement according to the terminal setting or the BS indication, and reports the frequency signal strength to the BS.
  • a transceiver is used for a call, other transceivers can continue to search and measure the frequency signal.
  • the MS can set up a separate antenna for each transceiver, or a single antenna for multiple transceivers.
  • Signal separation and synthesis can be accomplished by providing a splitter/combiner between the transceiver and the antenna.

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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 transfert dans lequel est établie une première liaison de service entre une station de base source et un premier émetteur-récepteur d'une station mobile. Ledit procédé consiste à recevoir une demande de transfert de la station de base source; à transmettre une demande d'affectation à une station de base cible en fonction de la demande de transfert et à établir une seconde liaison de service entre la cible et le second émetteur-récepteur de la station mobile; et à transmettre une commande de transfert indiquant à la station mobile de commuter sur la seconde liaison de service après avoir reçu le message d'exécution de la liaison de service. Le procédé de transfert, le système et la station mobile de l'invention permettent d'établir une liaison de service à interface radio entre la station de base cible et la station mobile avant la transmission de la commande de transfert. Le transfert peut ainsi être directement exécuté et la connexion de la liaison de service à interface radio ne nécessite pas d'attente. La durée d'interruption du transfert peut être considérablement réduite et le problème de la perte d'appel au cours de la procédure de transfert causée par l'instabilité du signal de l'interface radio peut être efficacement évité. La continuité de la communication peut être garantie et la qualité de la communication augmente efficacement.
PCT/CN2008/070602 2007-06-04 2008-03-27 Procédé de transfert et système et station mobile associés WO2008148314A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710111730.9 2007-06-04
CN2007101117309A CN101321381B (zh) 2007-06-04 2007-06-04 一种硬切换方法及***和移动台

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WO2008148314A1 true WO2008148314A1 (fr) 2008-12-11

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WO (1) WO2008148314A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN101583198A (zh) * 2009-06-12 2009-11-18 华为技术有限公司 切换链路建立方法、装置和***
CN110035451B (zh) * 2018-01-11 2020-08-28 惠州Tcl移动通信有限公司 通信切换方法及通信切换装置

Citations (3)

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CN1189757A (zh) * 1996-12-19 1998-08-05 摩托罗拉公司 用于软越区切换的***、方法和无线通信装置
CN1391407A (zh) * 2001-06-13 2003-01-15 华为技术有限公司 全球无线移动通信***中通话无缝切换的***及其方法
CN1969578A (zh) * 2004-06-15 2007-05-23 艾利森电话股份有限公司 平滑硬切换方法及适用于该方法的移动台和基站

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Publication number Priority date Publication date Assignee Title
CN1157969C (zh) * 2002-12-13 2004-07-14 大唐移动通信设备有限公司 一种移动通信***中的切换方法
CN100353806C (zh) * 2004-04-01 2007-12-05 大唐移动通信设备有限公司 Td－scdma移动通信***中的接力切换方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1189757A (zh) * 1996-12-19 1998-08-05 摩托罗拉公司 用于软越区切换的***、方法和无线通信装置
CN1391407A (zh) * 2001-06-13 2003-01-15 华为技术有限公司 全球无线移动通信***中通话无缝切换的***及其方法
CN1969578A (zh) * 2004-06-15 2007-05-23 艾利森电话股份有限公司 平滑硬切换方法及适用于该方法的移动台和基站

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CN101321381A (zh) 2008-12-10

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