WO2012097638A1 - 终端实现eutran到utran的ps切换的方法及系统 - Google Patents

终端实现eutran到utran的ps切换的方法及系统 Download PDF

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Publication number
WO2012097638A1
WO2012097638A1 PCT/CN2011/082378 CN2011082378W WO2012097638A1 WO 2012097638 A1 WO2012097638 A1 WO 2012097638A1 CN 2011082378 W CN2011082378 W CN 2011082378W WO 2012097638 A1 WO2012097638 A1 WO 2012097638A1
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Prior art keywords
terminal
network side
location area
location
area information
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PCT/CN2011/082378
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English (en)
French (fr)
Inventor
韦玉珍
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中兴通讯股份有限公司
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Publication of WO2012097638A1 publication Critical patent/WO2012097638A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]

Definitions

  • the present invention relates to CS domain fallback (CSFB) service technology, and in particular, to a method and system for a terminal to implement PS switching from EUTRAN to UTRAN.
  • CSFB CS domain fallback
  • the CSFB service generally includes: First, the terminal sends an extended service request, and includes a CS fallback indication in the extended service request to indicate that the CSFB process is to be performed; at this time, if the terminal is in an active state, the mobility management entity (MME) will The evolved base station (eNodeB) in the EUTRAN transmits a terminal (UE) context modification request message, and carries a CS fallback indication in the UE context modification request message to instruct the EUTRAN to move the terminal to the universal mobile communication system terrestrial radio access network (UTRAN) The system; then, the EUTRAN sends a UE context modification response message as a response.
  • UE terminal
  • UTRAN universal mobile communication system terrestrial radio access network
  • the MME sends an initial context setup request message carrying the CS fallback indication to the EUTRAN to instruct the EUTRAN to move the terminal to the UTRAN system, and the EUTRAN sends an initial context setup response message as a response.
  • the EUTRAN optionally performs the step of requiring the terminal to transmit a UTRAN measurement report, the step being to determine that the target of the CSFB service to be performed is a UTRAN cell. If the network supports EUTRAN to UTRAN packet switched (PS) handover, the EUTRAN may optionally perform the step of requiring the terminal to transmit a measurement report to determine the condition of the target UTRAN cell.
  • PS packet switched
  • the EUTRAN sends a command to remove the EUTRAN from the terminal, where the carrying field indicates that this is a CSFB process, and the terminal starts the handover process after receiving the removal command: First, the terminal in the connected state is converted to the idle state, and the location area identifier (LAI) of the target cell is obtained by reading the system information; then, the terminal determines whether the LAI of the target cell changes, and if the change occurs, the terminal immediately initiates Location update or federated location area/routing area (LA/RA) update process, this location update needs to be issued as early as possible to speed up the CSFB process.
  • LAI location area identifier
  • the terminal may send its own location update first, and then the route update process is sent in the subsequent process; secondly, the terminal sends a service request message to the target mobile exchange center (MSC) to initiate the primary message. Calling the process;
  • the terminal has not initiated the location update (LAU) in the target format, or the new LAI does not allow, then the network will return a service reject message. At this time, the terminal believes that the LAU is not updated, and the location is immediately initiated.
  • the update process updates its LAI, and the terminal then performs the call control process.
  • the judgment of the location area is a key step. Although this step is optional, if the terminal does not judge, it will perform business in the location area. In the case, especially if the MSC also changes, it will be rejected by the network side, and then the location update process will be initiated again, which will undoubtedly prolong the time of the CSFB process. Moreover, in the PS handover from EUTRAN to UTRAN, the network side The location area information of the new cell is not carried to the terminal. Therefore, the terminal must first read the system information in the new cell or obtain the location area information, and the process also extends the CSFB process time.
  • the network side does not inform the location area information of the target cell, and the terminal always initiates the update at the first time to ensure the process, regardless of whether the location area changes, this is not in the location area. In the case of change, it is actually a waste. If the terminal does not initiate the location update at the first time, but considers that the location area has not changed, the CS service flow is directly initiated. The network side may reject the terminal access because the location area is different or the MSC is different. At this time, when the terminal initiates the location update again. The process, for the CSFB process, undoubtedly increases the process of business request and rejection, extending the time of the CSFB process. Summary of the invention
  • the main purpose of the present invention is to provide a method and system for implementing a PS handover of an EUTRAN to a UTRAN by a terminal, which can avoid system rejection caused by a terminal originating a service due to different location areas, accelerate the completion of the CSFB process, and improve system performance.
  • a method for implementing a PS handover of an EUTRAN to a UTRAN by a terminal comprising: transmitting, by a network side, a location area information of a target cell to a terminal by using a packet switching PS handover command;
  • the terminal determines, according to the obtained location information, whether the location area identifier LAI of the target cell changes, and when the change occurs, initiates a location update, and then initiates a circuit switched CS service request.
  • the location area information of the target cell is in a manner of carrying a 3G system information container; or is carried in the non-access layer NAS information.
  • the method further includes: the terminal determining that the call needs to be initiated, or the terminal receiving the paging message on the network side.
  • the network side sends the location area information of the target cell to the terminal by using a packet switching PS handover command, including:
  • the E-UTRAN network side terminal sends a command to remove from the EUTRA, and the field carries a field in the removal command to indicate that the CS domain falls back to the CSFB process, and the terminal receives the removal command to start the handover process, on the E-UTRAN network side.
  • the handover command carries NAS information or 3G system information of the target cell;
  • the terminal parses the location area information therein according to the NAS information or the 3G system information in the handover command to obtain the LAI of the target cell.
  • initiating the location update includes:
  • the terminal initiates a location update or a joint location area/routing area LA/RA update; or, the terminal initiates a separate location update, and performs routing update in a subsequent process.
  • a method for implementing a PS handover of an EUTRAN to a UTRAN by a terminal comprising: receiving a PS handover command in a CSFB process, and transmitting a CS service request to a network side, where the CS service request carries a CSFB indicating that the CS service is a CSFB Initiated by the process
  • the network side initiates a call flow according to the location area information of the terminal.
  • the process of initiating a call by the network side according to the location area information of the terminal includes:
  • the network side saves the current location area information and continues the call
  • the network side sends a requesting user identification procedure to establish user data, and at the same time, the network side itself initiates and completes the location update procedure, and then continues the call.
  • the sending, by the terminal, the CS service request to the network side includes: sending, by the terminal, a CS service request message or a paging response message to the MSC of the target system, and carrying the CSFB indication in the message, to notify the network side that the current process is a CSFB process .
  • a system for implementing a PS handover from EUTRAN to UTRAN comprising at least a network side and a terminal, where
  • the network side is configured to send the location area information of the target cell to the terminal by using the PS handover command, and the terminal is configured to determine, according to the obtained location information, whether the LAI of the target cell changes, and initiate a location update when the change occurs, Re-initiate CS service request.
  • a system for implementing a PS handover from EUTRAN to UTRAN comprising at least a network side and a terminal, where
  • the network side is configured to send a PS handover command to the terminal; receive the CS service request, and initiate a call process according to the location area information of the terminal;
  • the terminal is configured to receive a PS handover command, initiate a CS service request to the network side, and notify the network On the network side, the CS service is initiated by the CSFB process.
  • the network side sends the location area information of the target cell to the terminal in the PS handover command, or changes in the location area through compatible processing on the network side.
  • a location update was initiated as early as possible.
  • it avoids the system rejection that the terminal suffers due to different location areas; on the other hand, it accelerates the completion of the CSFB process and improves system performance.
  • FIG. 1 is a flow chart of a method for implementing a PS handover of an EUTRAN to a UTRAN by a terminal according to the present invention
  • FIG. 2 is a schematic flowchart of a first embodiment of implementing a PS handover of an EUTRAN to a UTRAN by a terminal according to the present invention
  • FIG. 3 is a schematic flow chart of a second embodiment of implementing a PS handover of an EUTRAN to a UTRAN by a terminal according to the present invention. detailed description
  • FIG. 1 is a flow chart of a method for implementing a PS handover of an EUTRAN to a UTRAN by a terminal according to the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 100 The network side sends the location area information of the target cell to the terminal by using a PS handover command.
  • the location area information of the target cell may be carried in a manner of carrying a 3G system information container, or may be directly carried in a non-access stratum (NAS) information, and the required information of the terminal may be obtained from the 3G system information or the NAS information.
  • LAI information of the target cell refers to the modification method, which means adding a 3G system information container to the PSHO. The specific implementation of the method belongs to a technology known to those skilled in the art, and details are not described herein again.
  • Step 101 The terminal determines, according to the obtained location information, whether the LAI of the target cell occurs. Change, and when a change occurs, initiate a location update and then initiate a CS service request.
  • the terminal since the network side transmits the location area information of the target cell to the terminal in the PS handover command, the terminal initiates the location update as early as possible in the case where the location area changes. On the one hand, it avoids the system rejection that the terminal suffers due to different location areas; on the other hand, it accelerates the completion of the CSFB process and improves system performance.
  • the terminal of the CSFB process is expected to establish a call as soon as possible, and the delay is minimized.
  • the present invention can also be implemented on the network side to determine whether a location update needs to be initiated, including:
  • the terminal receives the PS handover command in the CSFB process, and sends a CS service request to the network side.
  • the CS service request carries a CSFB indication that is used to indicate that the CS service is initiated by the CSFB process.
  • the network side initiates a call flow according to the location area information of the terminal. .
  • the terminal receives the PS handover command in the CSFB process, does not detect whether the location area changes, but directly sends a CS service request (CS service request), and informs the network side that the CS service is initiated by the CSFB process;
  • the network side may initiate the following process according to the location area information of the terminal: If the location area information does not change, the call flow is continued, and there is no impact on the network side; if the location area information changes, the MSC does not change.
  • the network side saves the current location area information and continues the call.
  • the call may be accompanied by a Temporary Mobile Subscriber Identity (TMSI) redistribution process.
  • TMSI Temporary Mobile Subscriber Identity
  • the MSC also changes, the network side initiates a request for the user identification process to establish a user. Data, at the same time, the network side itself initiates and completes the location update process, after which the call can continue.
  • TMSI Temporary Mobile Subscriber Identity
  • the version control mode is not supported for the lower version, but is supported by the high version.
  • the terminal reports when it is necessary to support this function.
  • the paging response when the CS service request or the called party is required.
  • Paging response Add a field for the CSFB indication in the message, so that the network side will implement the invention on the network side.
  • the system of the present invention further provides a system for implementing a PS switching of the EUTRAN to the UTRAN, including at least a network side and a terminal, where
  • the network side is configured to send the location area information of the target cell to the terminal by using a PS handover command, and the terminal is configured to determine, according to the obtained location information, whether the LAI of the target cell changes, and initiate a location update when the change occurs, Re-initiate CS service request.
  • the network side is configured to send a PS handover command to the terminal; receive the CS service request, and determine, according to the location area information of the terminal, the implementation of the call process;
  • the terminal is configured to receive a PS handover command, initiate a CS service request to the network side, and notify the network side that the CS service is initiated by the CSFB process.
  • FIG. 2 is a schematic flowchart of a first embodiment of implementing a PS handover of an EUTRAN to a UTRAN by a terminal according to the present invention.
  • a terminal according to a location information of a target cell in a received PS handover command is used. Determine the execution of subsequent processes.
  • Steps 200 to 202 The terminal needs to initiate a call or the terminal receives the paging message on the network side:
  • the voice service can be implemented by using other networks.
  • the terminal can notify the network side by extending the service request.
  • the network side also supports the CSFB service, the network side responds to the extended service request of the terminal.
  • the MME sends the eNodeB to the eNodeB in the E-UTRAN.
  • Carrying a UE context modification request message with a CS fallback indication instructing the E-UTRAN to move the terminal to the UTRAN system; E-UTRAN sends a UE context modification request response as a response; if the terminal is in an idle state, the MME sends the carried to the E-UTRAN The initial context setup request message of the CS fallback indication to indicate The E-UTRAN moves the terminal to the UTRAN system, and the E-UTRAN sends an initial context setup request response as a response.
  • the E-UTRAN may choose to perform the step of requiring the terminal to transmit a measurement report to determine the condition of the target UTRAN cell.
  • Step 203 The network side commands the terminal to start performing the handover: the E-UTRAN sends a command to move from the EUTRA to the terminal, and the field carries a field in the removal command to indicate that it is a CSFB process, and the terminal receives the removal command to start the handover process, and performs handover on the network side.
  • the command carries NAS information or 3G system information of the target cell.
  • Steps 204 to 207 The terminal parses the location area information according to the NAS information or the 3G system information in the handover command to obtain the LAI of the target cell (the specific implementation belongs to the technical means used by those skilled in the art, and details are not described herein). It is determined whether the LAI of the target cell changes. If the change occurs, the terminal immediately initiates a location update or a joint LA/RA update; the terminal may also initiate a separate location update, and then perform routing update in the subsequent process.
  • LAU location area update
  • LAI new location area
  • FIG. 3 is a schematic flowchart of a second embodiment of implementing a PS handover of an EUTRAN to a UTRAN by a terminal according to the present invention.
  • a terminal receives a PS handover command in a CSFB process, And not detecting whether the location area changes, but directly sending a CS service request, and informing the network side that the CS service is initiated by the CSFB process; at this time, the network side performs a call process according to the location area of the terminal, specifically including :
  • Step 300 to step 302 The terminal needs to initiate a call or the terminal receives the paging on the network side.
  • the terminal sends an extended service request to the MEME on the network side. If the network side also supports CSFB, the network side responds to the extended service request of the terminal. If the terminal is in the active state, the MME sends an indication of carrying the CS fallback indication to the eNodeB in the E-UTRAN.
  • a UE context modification request message instructing the E-UTRAN to move the terminal to the UTRAN system; the E-UTRAN sends a UE context modification request response as a response; if the terminal is in an idle state, the MME sends an initial context carrying the CS fallback indication to the E-UTRAN A request message is established to instruct the E-UTRAN to move the terminal to the UTRAN system, and the E-UTRAN sends an initial context setup request response as a response.
  • the E-UTRAN may choose to perform the step of requiring the terminal to transmit a measurement report to determine the condition of the target UTRAN cell.
  • Step 303 The E-UTRAN sends a command to remove the command from the EUTRA to the terminal, and carries a field in the move-out command to indicate that it is a CSFB process, and the terminal receives the move-out command to start the handover process.
  • Step 304 CS service request: The terminal sends a CS service request message to the MSC of the target system, and the called party is a Paging response, which carries a CSFB indication to notify the current process on the network side as a CSFB process.
  • Step 305 to step 310 The network side decides: the network side receives the CS service request or the paging response of the terminal, and reads the CSFB indication; if the location area changes and the MSC does not change, the network side saves the current location area information, and continues the call. If the MSC also changes, the network side initiates a requesting user identification process to establish user data, and at the same time, the network side itself initiates and completes the location update process, and then continues the call to complete the PS handover process.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

本发明公开了一种终端实现演进的通用移动通信系统陆地无线接入网EUTRAN到通用移动通信系统陆地无线接入网UTRAN的PS切换的方法及系统,通过本发明方法,网络侧在分组交换PS切换命令中将目标小区的位置区信息发送给了终端,或者通过网络侧的兼容处理,在位置区发生变化的情况下,尽可能早地发起了位置更新。一方面,避免了终端由于位置区不同发起业务而遭受的系统拒绝;另一方面,加速了电路交换域回落CSFB过程的完成,提高了系统性能。

Description

终端实现 EUTRAN到 UTRAN的 PS切换的方法及系统 技术领域
本发明涉及 CS 域回落(CSFB ) 业务技术, 尤其涉及一种终端实现 EUTRAN到 UTRAN的 PS切换的方法及系统。 背景技术
通过电路交换 ( CS )域回落(CSFB )业务, 演进的通用移动通信系统 陆地无线接入网 ( EUTRAN , Evolved UMTS Terrestrial Radio Access Network ) 网络上的终端能够借助其它网络使用语音业务。 CSFB 业务大致 包括: 首先, 终端通过发送扩展业务请求, 在扩展业务请求中包含有 CS回 落指示, 以指示要进行 CSFB 过程; 此时, 如果终端处在激活态, 移动管 理实体( MME )会向 EUTRAN中的演进基站( eNodeB )发送终端 ( UE ) 上下文修改请求消息,并在该 UE上下文修改请求消息中携带 CS回落指示, 以指示 EUTRAN 将终端移动到通用移动通信系统地面无线接入网 ( UTRAN )系统;接着, EUTRAN发送 UE上下文修改响应消息作为应答。 如果终端处在空闲态, MME向 EUTRAN发送携带有 CS回落指示的初始 上下文建立请求消息, 以指示 EUTRAN 将终端移动到 UTRAN 系统, EUTRAN发送初始上下文建立响应消息作为应答。
EUTRAN可选执行要求终端发送 UTRAN测量报告的步驟, 该步驟是 为了确定将要执行 CSFB 业务的目标是 UTRAN 小区。 如果网络支持 EUTRAN到 UTRAN的分组交换 ( PS )切换, 则 EUTRAN可选执行要求 终端发送测量报告的步驟以确定目标 UTRAN小区的情况。
EUTRAN向终端发送从 EUTRAN移出命令,其中携带字段指示这是一 个 CSFB过程, 终端收到移出命令后开始执行切换过程: 首先, 处于连接态的终端转换为空闲态, 并通过读取系统信息来获得 目标小区的位置区标识(LAI ); 接着, 终端判断目标小区的 LAI是否发生 变化, 如果发生变化, 终端会马上发起位置更新或者联合位置区 /路由区 ( LA/RA ) 更新过程, 这个位置更新需要尽可能早的发出以加速 CSFB 过 程。 因此, 如果目标网络操作模式为 I, 终端可能先发其单独的位置更新, 然后, 后续流程中再发送路由更新过程; 其次, 终端向目标制式的移动交 换中心 (MSC )发送业务请求消息发起主叫过程; 可选的, 如果终端还没 有在目标制式发起位置更新(LAU ), 或者新的 LAI不允许, 那么, 网络会 返回业务拒绝消息, 此时, 终端认为 LAU没有更新, 会马上发起位置更新 过程以更新其 LAI, 然后终端再进行呼叫控制流程。
从上面的流程可以看出, 切入到目标制式后, 位置区的判断是一个关 键步驟, 虽然这一步驟是可选的, 但是, 如果终端不进行判断就冒然进行 业务, 在位置区更改的情况下、 尤其是 MSC也改变的情况下, 会遭到网络 侧的拒绝, 继而再次发起位置更新流程, 无疑延长了 CSFB过程的时间; 而且, 在从 EUTRAN到 UTRAN的 PS切换中, 网络侧并没有携带新 的小区的位置区信息给终端, 因此, 终端要进行位置区的判断必须先要在 新小区读取系统信息, 或获取位置区信息, 这个过程同样也延长了 CSFB 过程的时间。
另一方面, 如果由于现有流程中, 网络侧没有告知终端目标小区的位 置区信息, 而终端为了确保流程, 会始终在第一时间发起更新而不论位置 区是否发生改变, 这在位置区不变的情况下实际是一种浪费。 如果终端不 在第一时间发起位置更新,而是认为位置区没有发生改变就直接发起 CS业 务流程, 网络侧会因为位置区不同或 MSC不同而拒绝终端接入, 此时, 当 终端再发起位置更新流程, 对于 CSFB 过程来讲, 无疑增加了业务请求和 拒绝的流程, 延长了 CSFB过程的时间。 发明内容
有鉴于此, 本发明的主要目的在于提供一种终端实现 EUTRAN 到 UTRAN的 PS切换的方法及系统, 能够避免终端由于位置区不同发起业务 而遭受的系统拒绝, 加速 CSFB过程的完成, 提高系统性能。
为达到上述目的, 本发明的技术方案是这样实现的:
一种终端实现 EUTRAN到 UTRAN的 PS切换的方法, 包括: 网络侧 通过分组交换 PS切换命令将目标小区的位置区信息发送给终端;
终端根据获得的位置信息, 判断目标小区的位置区标识 LAI是否发生 变化, 并在发生变化时, 发起位置更新, 再发起电路交换 CS业务请求。
所述目标小区的位置区信息采用携带 3G系统信息容器的方式; 或者, 携带在非接入层 NAS信息中。
所述网络侧通过分组交换 PS切换命令将目标小区的位置区信息发送给 终端之前, 该方法还包括: 所述终端确定需要发起呼叫, 或者所述终端收 到网络侧的寻呼消息。
所述网络侧通过分组交换 PS切换命令将目标小区的位置区信息发送给 终端, 包括:
所述 E-UTRAN网络侧向终端发送从 EUTRA移出命令,在移出命令中 携带字段以指示是 CS域回落 CSFB过程,所述终端收到移出命令开始执行 切换过程, 在所述 E-UTRAN网络侧的切换命令中携带有目标小区的 NAS 信息或 3G系统信息;
所述终端根据切换命令中的 NAS信息或 3G系统信息, 解析出其中的 位置区信息以获得目标小区的 LAI。
所述判断出位置区信息发生变化时, 发起位置更新包括:
所述终端发起位置更新或者联合位置区 /路由区 LA/RA更新; 或者, 所述终端发起单独的位置更新, 在后续流程中再进行路由更新。 一种终端实现 EUTRAN到 UTRAN的 PS切换的方法, 包括: 终端在 CSFB过程中接收到 PS切换命令, 向网络侧发 CS业务请求, 所述 CS业务请求中携带有用于指示该 CS业务是因 CSFB过程而发起的
CSFB指示;
网络侧根据所述终端的位置区信息发起呼叫流程。
所述网络侧根据所述终端的位置区信息发起呼叫流程包括:
如果所述位置区信息没有发生变化, 继续进行呼叫流程;
如果所述位置区信息发生改变而移动交换中心 MSC没有发生变化, 所 述网络侧保存当前位置区信息, 继续呼叫;
如果所述位置区信息发生改变且 MSC发生改变, 所述网络侧向终端发 起请求用户标识过程, 建立用户数据, 同时, 由所述网络侧自身发起并完 成位置更新流程, 之后继续进行呼叫。
所述终端向网络侧发 CS业务请求包括: 所述终端向目标制式的 MSC 发送 CS业务请求消息或寻呼响应消息, 并在该消息中携带有 CSFB指示, 以通知网络侧当前过程为 CSFB过程。
一种终端实现 EUTRAN到 UTRAN的 PS切换的系统, 至少包括网络 侧和终端, 其中,
网络侧, 用于通过 PS切换命令将目标小区的位置区信息发送给终端; 终端, 用于终端根据获得的位置信息, 判断目标小区的 LAI是否发生 变化, 并在发生变化时, 发起位置更新, 再发起 CS业务请求。
一种终端实现 EUTRAN到 UTRAN的 PS切换的系统, 至少包括网络 侧和终端, 其中,
网络侧, 用于向终端发送 PS切换命令; 接收到 CS业务请求, 根据终 端的位置区信息发起呼叫过程;
终端, 用于收到 PS切换命令, 向网络侧发起 CS业务请求, 并告知网 络侧, 该 CS业务是因 CSFB过程而发起的。
从上述本发明提供的技术方案可以看出, 通过本发明方法, 网络侧在 PS切换命令中将目标小区的位置区信息发送给了终端, 或者通过网络侧的 兼容处理, 在位置区发生变化的情况下, 尽可能早地发起了位置更新。 一 方面, 避免了终端由于位置区不同发起业务而遭受的系统拒绝; 另一方面, 加速了 CSFB过程的完成, 提高了系统性能。 附图说明
图 1为本发明终端实现 EUTRAN到 UTRAN的 PS切换的方法的流程 图;
图 2为本发明终端实现 EUTRAN到 UTRAN的 PS切换的第一实施例 的流程示意图;
图 3为本发明终端实现 EUTRAN到 UTRAN的 PS切换的第二实施例 的流程示意图。 具体实施方式
图 1为本发明终端实现 EUTRAN到 UTRAN的 PS切换的方法的流程 图, 如图 1所示, 包括以下步驟:
步驟 100: 网络侧通过 PS切换命令将目标小区的位置区信息发送给终 端。
本步驟中, 目标小区的位置区信息可以采用携带 3G系统信息容器的方 式, 也可以直接携带在非接入层(NAS )信息中, 从 3G系统信息或 NAS 信息中均可以获得终端所需要的目标小区的 LAI信息。这里,携带 3G系统 信息容器的方式是指修改方式,是指在 PSHO中增加一个 3G系统信息容器。 该方式的具体实现属于本领域技术人员公知技术, 这里不再赘述。
步驟 101 : 终端根据获得的位置信息, 判断目标小区的 LAI是否发生 变化, 并在发生变化时, 发起位置更新, 再发起 CS业务请求。
通过图 1所示的方法, 由于网络侧在 PS切换命令中将目标小区的位置 区信息发送给了终端, 这样, 在位置区发生变化的情况下, 终端尽可能早 地发起了位置更新。 一方面, 避免了终端由于位置区不同发起业务而遭受 的系统拒绝; 另一方面, 加速了 CSFB过程的完成, 提高了系统性能。
由于 CSFB 过程的终端期望尽快建立呼叫, 尽量缩短时延, 本发明也 可以在网络侧实现确定是否需要发起位置更新, 具体包括:
终端在 CSFB过程中接收到 PS切换命令, 向网络侧发 CS业务请求, CS业务请求中携带有用于指示 CS业务是因 CSFB过程而发起的 CSFB指 示; 网络侧根据终端的位置区信息发起呼叫流程。
终端在 CSFB过程中接收到 PS切换命令,不检测位置区是否发生变化, 而是直接发 CS业务请求(CS service request ), 并且告知网络侧, 该 CS业 务是因 CSFB 过程而发起的; 此时, 网络侧根据该终端的位置区信息可能 会发起以下流程: 如果位置区信息没有发生变化, 继续进行呼叫流程, 此 时对网络侧没有任何影响;如果位置区信息发生了改变而 MSC没有发生变 化, 网络侧保存当前位置区信息, 继续呼叫, 在呼叫过程中可能会伴随临 时移动用户识别码(TMSI )重分配过程; 如果 MSC也发生了改变, 网络 侧向终端发起请求用户标识过程, 建立用户数据, 同时, 由网络侧自身发 起并完成位置更新流程, 之后可以继续进行呼叫。
需要说明的是, 对于在网络侧实现确定是否需要发起位置更新这种实 现方案, 其具体实现方式会有多种, 比如网络侧全部升级, 以支持主动查 询并进行位置登记的处理; 再如采用版本控制方式, 对于低版本不支持, 而高版本支持; 又如修改层三消息内容, 由终端报告何时需要支持这种功 能, 此时, 需要在 CS业务请求或被叫时的寻呼响应 ( Paging response ) 消 息中增加一个用于 CSFB 指示的字段, 以便网络侧将本发明的在网络侧实 现确定是否需要发起位置更新这种实现方案的过程与正常的业务流程进行 区分。 以上具体实现方式的实现是本领域技术人员容易获知的, 这里不再 赘述。
针对本发明方法还提供相应的终端实现 EUTRAN到 UTRAN的 PS切 换的系统, 至少包括网络侧和终端, 其中,
网络侧, 用于通过 PS切换命令将目标小区的位置区信息发送给终端; 终端, 用于终端根据获得的位置信息, 判断目标小区的 LAI是否发生 变化, 并在发生变化时, 发起位置更新, 再发起 CS业务请求。
或者,
网络侧, 用于向终端发送 PS切换命令; 接收到 CS业务请求, 根据终 端的位置区信息确定呼叫过程的实现;
终端, 用于收到 PS切换命令, 向网络侧发起 CS业务请求, 并告知网 络侧, 该 CS业务是因 CSFB过程而发起的。
下面结合实施例对本发明提供的两种方法进行详细描述。
图 2为本发明终端实现 EUTRAN到 UTRAN的 PS切换的第一实施例 的流程示意图, 如图 2所示, 第一实施例中, 假设终端根据接收到的 PS切 换命令中的目标小区的位置信息确定后续流程的执行。
步驟 200~步驟 202: 终端需要发起呼叫或者终端收到网络侧的寻呼消 息: 对于在长期演进网络的终端来说, 语音业务可以借助其它网络来实现。 终端需要进行业务时, 可以通过扩展业务请求通知到网络侧的, 如果网络 侧也支持 CSFB 业务, 网络侧响应终端的扩展业务请求; 如果终端处在激 活态, MME向 E-UTRAN中的 eNodeB发送携带有 CS回落指示的 UE上下 文修改请求消息, 指示 E-UTRAN将终端移动到 UTRAN系统; E-UTRAN 发送 UE上下文修改请求响应作为应答; 如果终端处在空闲态, MME 向 E-UTRAN发送携带有 CS 回落指示的初始上下文建立请求消息, 以指示 E-UTRAN将终端移动到 UTRAN系统, E-UTRAN发送初始上下文建立请 求响应作为应答。
为了获取目标小区的更多信息,如果网络支持 E-UTRAN到 UTRAN的 PS切换, 则 E-UTRAN可以选择执行要求终端发送测量报告的步驟以确定 目标 UTRAN小区的情况。
步驟 203: 网络侧命令终端开始执行切换: E-UTRAN 向终端发送从 EUTRA移出命令, 在移出命令中携带字段以指示是一个 CSFB过程, 终端 收到移出命令开始执行切换过程, 在网络侧的切换命令中携带有目标小区 的 NAS信息或 3G系统信息。
步驟 204~步驟 207:终端根据切换命令中的 NAS信息或 3G系统信息, 解析出其中的位置区信息以获得目标小区的 LAI (具体实现属于本领域技 术人员惯用技术手段,这里不再赘述),判断目标小区的 LAI是否发生变化, 如果发生变化, 终端立即发起位置更新或者联合 LA/RA更新; 终端也可以 先发起单独的位置更新, 在后续流程中再进行路由更新。
步驟 208: CS业务请求: 终端向目标制式的 MSC发送 CS业务请求消 息, 以发起呼叫过程。如果终端还没有在目标制式发起位置区更新(LAU ), 或者新的位置区 (LAI ) 不允许, 那么, 网络侧返回业务拒绝消息, 此时, 终端认为 LAU没有更新, 会马上发起位置更新以更新其 LAI, 然后终端进 行呼叫控制流程, 完成 PS切换流程。
图 3为本发明终端实现 EUTRAN到 UTRAN的 PS切换的第二实施例 的流程示意图, 如图 3所示, 在第二实施例中, 4叚设终端在 CSFB过程中, 接收到 PS切换命令时, 不检测位置区是否发生变化, 而是直接发 CS业务 请求, 并且告知网络侧, 该 CS业务是因 CSFB过程而发起的; 此时, 网络 侧根据该终端的位置区执行呼叫流程, 具体包括:
步驟 300~步驟 302: 终端需要发起呼叫或者终端收到网络侧的寻呼消 息: 终端向网络侧 MEE发起扩展业务请求, 如果网络侧也支持 CSFB, 网 络侧响应终端的扩展业务请求; 如果终端处在激活态, MME向 E-UTRAN 中的 eNodeB发送携带有 CS 回落指示的 UE上下文修改请求消息, 指示 E-UTRAN将终端移动到 UTRAN系统; E-UTRAN发送 UE上下文修改请 求响应作为应答; 如果终端处在空闲态, MME 向 E-UTRAN发送携带有 CS回落指示的初始上下文建立请求消息, 以指示 E-UTRAN将终端移动到 UTRAN系统, E-UTRAN发送初始上下文建立请求响应作为应答。
为了获取目标小区的更多信息,如果网络支持 E-UTRAN到 UTRAN的 PS切换, 则 E-UTRAN可以选择执行要求终端发送测量报告的步驟以确定 目标 UTRAN小区的情况。
步驟 303: E-UTRAN向终端发送从 EUTRA移出命令, 在移出命令中 携带字段以指示是一个 CSFB过程, 终端收到移出命令开始执行切换过程。
步驟 304: CS业务请求: 终端向目标制式的 MSC发送 CS业务请求消 息, 被叫时为寻呼响应 (Paging response ), 其中携带有 CSFB指示, 以通 知网络侧当前过程为 CSFB过程。
步驟 305~步驟 310: 网络侧判决: 网络侧收到终端的 CS业务请求或寻 呼响应, 读取 CSFB指示; 如果位置区发生了改变而 MSC没有改变, 网络 侧保存当前位置区信息, 继续呼叫; 如果 MSC也发生了改变, 网络侧向终 端发起请求用户标识过程, 建立用户数据, 同时, 由网络侧自身发起并完 成位置更新流程, 之后继续呼叫, 完成 PS切换流程。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围, 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、一种终端实现 EUTRAN到 UTRAN的 PS切换的方法,其特征在于, 包括: 网络侧通过分组交换 PS切换命令将目标小区的位置区信息发送给终 端;
终端根据获得的位置信息, 判断目标小区的位置区标识 LAI是否发生 变化, 并在发生变化时, 发起位置更新, 再发起电路交换 CS业务请求。
2、 根据权利要求 1所述的方法, 其特征在于, 所述目标小区的位置区 信息采用携带 3G系统信息容器的方式; 或者, 携带在非接入层 NAS信息 中。
3、 根据权利要求 2所述的方法, 其特征在于, 所述网络侧通过分组交 换 PS切换命令将目标小区的位置区信息发送给终端之前, 该方法还包括: 所述终端确定需要发起呼叫, 或者所述终端收到网络侧的寻呼消息。
4、 根据权利要求 2所述的方法, 其特征在于, 所述网络侧通过分组交 换 PS切换命令将目标小区的位置区信息发送给终端, 包括:
所述 E-UTRAN网络侧向终端发送从 EUTRA移出命令,在移出命令中 携带字段以指示是 CS域回落 CSFB过程,所述终端收到移出命令开始执行 切换过程, 在所述 E-UTRAN网络侧的切换命令中携带有目标小区的 NAS 信息或 3G系统信息;
所述终端根据切换命令中的 NAS信息或 3G系统信息, 解析出其中的 位置区信息以获得目标小区的 LAI。
5、 根据权利要求 4所述的方法, 其特征在于, 所述判断出位置区信息 发生变化时, 发起位置更新包括:
所述终端发起位置更新或者联合位置区 /路由区 LA/RA更新; 或者, 所述终端发起单独的位置更新, 在后续流程中再进行路由更新。
6、一种终端实现 EUTRAN到 UTRAN的 PS切换的方法,其特征在于, 包括:
终端在 CSFB过程中接收到 PS切换命令, 向网络侧发 CS业务请求, 所述 CS业务请求中携带有用于指示 CS业务是因 CSFB过程而发起的 CSFB 指示;
网络侧根据所述终端的位置区信息发起呼叫流程。
7、 根据权利要求 6所述的方法, 其特征在于, 所述网络侧根据所述终 端的位置区信息发起呼叫流程包括:
如果所述位置区信息没有发生变化, 继续进行呼叫流程;
如果所述位置区信息发生改变而移动交换中心 MSC没有发生变化, 所 述网络侧保存当前位置区信息, 继续呼叫;
如果所述位置区信息发生改变且 MSC发生改变, 所述网络侧向终端发 起请求用户标识过程, 建立用户数据, 同时, 由所述网络侧自身发起并完 成位置更新流程, 之后继续进行呼叫。
8、 根据权利要求 6 所述的方法, 其特征在于, 所述终端向网络侧发 CS业务请求包括:所述终端向目标制式的 MSC发送 CS业务请求消息或寻 呼响应消息, 并在该消息中携带有 CSFB 指示, 以通知网络侧当前过程为 CSFB过程。
9、一种终端实现 EUTRAN到 UTRAN的 PS切换的系统,其特征在于, 至少包括网络侧和终端, 其中,
所述网络侧,用于通过 PS切换命令将目标小区的位置区信息发送给终 端;
所述终端, 用于终端根据获得的位置信息, 判断目标小区的 LAI是否 发生变化, 并在发生变化时, 发起位置更新, 再发起 CS业务请求。
10、 一种终端实现 EUTRAN到 UTRAN的 PS切换的系统, 其特征在 于, 至少包括网络侧和终端, 其中, 网络侧, 用于向终端发送 PS切换命令; 接收到 CS业务请求, 根据终 端的位置区信息发起呼叫过程;
终端, 用于收到 PS切换命令, 向网络侧发起 CS业务请求, 并告知网 络侧 CS业务是因 CSFB过程而发起的。
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