WO2008034309A1 - A mehtod for avoiding overfolow of a interface soft handover message - Google Patents

A mehtod for avoiding overfolow of a interface soft handover message Download PDF

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Publication number
WO2008034309A1
WO2008034309A1 PCT/CN2006/003767 CN2006003767W WO2008034309A1 WO 2008034309 A1 WO2008034309 A1 WO 2008034309A1 CN 2006003767 W CN2006003767 W CN 2006003767W WO 2008034309 A1 WO2008034309 A1 WO 2008034309A1
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WO
WIPO (PCT)
Prior art keywords
base station
message
switching center
mobile terminal
mobile switching
Prior art date
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PCT/CN2006/003767
Other languages
French (fr)
Chinese (zh)
Inventor
Wei Zhang
Baoyan Liu
Wanchun Zhang
Zhihui Zhang
Original Assignee
Zte Corporation
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Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Publication of WO2008034309A1 publication Critical patent/WO2008034309A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the present invention relates to the field of mobile communication technologies, in particular, an A interface between a mobile switching center (MSC) and a base station (BS) in a CDMA2000 network system (between a mobile switching center and a base station) Interface) A method of soft switching message flow control.
  • FIG. 1 is a specific flowchart of a soft handover and a top soft handover message after a mobile terminal initiates a call in the prior art. As shown in FIG.
  • Step 101 The mobile terminal (MS) initiates a request message to the base station (BS) by using the control channel on the air interface, and requests to initiate a call;
  • Step 102 The base station (BS) receives After the request information to the mobile terminal (MS), reply a confirmation message Base Station Ack Order to the mobile terminal (MS), indicating that the request for processing the mobile terminal has begun to be processed;
  • Step 103 The base station (BS) to the mobile switching center (MSC) Initiating a call request CM Service Request of the mobile terminal, requesting the mobile switching center (MSC) to perform call processing;
  • Step 104 The mobile switching center (MSC) sends a finger to the base station (BS) after processing the call request of the base station (BS) With the request message AssignmentRequest, the base station (BS) is required to perform assignment of the air channel and the terrestrial circuit;
  • Step 201 When the mobile switching center (MSC) of the mobile user visited the terminal receives the terminal call request of the user, sends the message to the base station (BS).
  • MSC mobile switching center
  • Step 202 After receiving the paging request, the base station (BS) initiates a paging message Page Message to the mobile terminal (MS); Step 203: After the mobile terminal (MS) receives the paging message, Determining that the International Mobile Subscriber Identity (IMSI) carried in the paging message is consistent with its International Mobile Subscriber Identity (IMSI), sending a paging response message to the base station (BS) Step 204: The base station (BS) requests to establish a signaling connection to the mobile switching center (MSC), and sends a search to the mobile switching center (MSC).
  • IMSI International Mobile Subscriber Identity
  • MSC mobile switching center
  • Step 205 The base station (BS) replies to the mobile terminal (MS) with a response message Base Station Ack Order, notifying the mobile terminal (MS) that the base station (BS) has received the paging response;
  • Step 206 Mobile switching center After processing the paging response of the base station (BS), the (MSC) sends an assignment request message to the base station (BS), requesting the base station to perform assignment of the air channel and the terrestrial circuit;
  • Step 207: The base station (BS) is After the completion of the over-the-air channel establishment with the mobile terminal (MS), the ground circuit between the base station (BS) and the mobile switching center (MSC) is allocated;
  • Step 209 The mobile terminal (MS) initiates a soft handover between two base stations (BSs) under the same mobile switching center (MSC), or a cell under the same base station (BS) (Cell a softer handover between the two;
  • a mobile switching center (MSC) is caused by a handover between a different base station (BS) under the same mobile switching center (MSC) and even a handover between cells (Cells).
  • the amount of A-interface messages between the base station (BS) and the base station (BS) is very large, which is likely to cause congestion of the A-interface message.
  • the mechanism of the method is simple, that is, setting a switch at the base station (BS), and controlling the reporting of the soft handover message Handoff Performed according to service requirements. Since the existing services such as voice, short message, and data do not require the base station (BS) to directly report the location information, the service processing can still be performed.
  • the interface (the interface between the mobile switching center and the base station) soft-switches the congestion of the message, and realizes various new functional requirements put forward by the operator.
  • the present invention provides a method for preventing excessive traffic of an A-interface soft handover message, including: Step 1: Adding, in the assignment request message sent by the mobile switching center to the base station, whether to require the base station to report soft handover Step 2: After receiving the assignment request, the base station records the identifier bit to indicate whether the soft handover message needs to be reported; Step 3: The mobile terminal initiates handover of the base station or the cell; Step 4: Base station #_ The flag bit recorded in step 2 is used to determine whether to send a soft handover message to the mobile switching center. Wherein, a Tag field is added to the assignment request message to store a flag bit. In the step 1, the flag bit is marked according to the service attribute of the mobile terminal.
  • the marking bit is marked in the mobile switching center.
  • the flag bit is marked in a home location register.
  • the present invention further provides a method for a mobile terminal to report a soft handover message, comprising the following steps: The mobile terminal initiates request information to the base station; after receiving the request information, the base station replies with an acknowledgement message to the mobile terminal; the base station initiates a move to the mobile switching center.
  • the mobile switching center after processing the call request of the base station, the mobile switching center sends an assignment request message to the base station, where a flag indicating whether the base station is required to report the soft handover message is added to the assignment request message; After the request message is allocated, the flag bit is decoded, and the flag bit is recorded; the base station completes the air channel establishment with the mobile terminal and allocates the ground circuit between the base station and the mobile switching center; the base station sends an assignment request to the mobile switching center.
  • the mobile terminal initiates the handover of the base station or the cell; the base station determines whether it needs to send the soft handover message to the mobile switching center according to the recorded flag bit, and does not report the soft handover message if not required, otherwise performs the next step; Switching center sends soft cut Message, the mobile switching center requires updating the location information of the mobile terminal.
  • a Tag field is added to the assignment request message to store a flag bit.
  • the flag bit is marked according to the service attribute of the mobile terminal.
  • the flag bit is marked in the mobile switching center.
  • the flag bit is marked in a home location register.
  • the present invention further provides a method for a called mobile terminal to report a soft handover message, comprising the following steps: after receiving a terminal call request, the mobile switching center sends a paging request to the base station; after receiving the paging request, the base station sends the paging request to the mobile terminal.
  • the mobile terminal After receiving the paging message, the mobile terminal sends a paging response message to the base station; the base station sends a paging response message to the mobile switching center; the base station replies to the mobile terminal with a response message; and the mobile switching center processes the base station After the response, the base station sends an assignment request message to the base station, where a flag indicating whether the base station is required to report the soft handover message is added to the assignment request message; after receiving the assignment request message, the base station decodes the identifier bit, And recording the flag bit; the base station completes the air channel establishment with the mobile terminal and allocates the ground circuit between the base station and the mobile switching center; the base station sends an assignment request completion message to the mobile switching center; the mobile terminal initiates the base station or the cell to perform handover; The base station determines whether it needs to move to the mobile switching center according to the recorded flag bits.
  • Soft handover send the message, if no report message is not soft handoff, otherwise the next step; the base station sends a soft handover message to the mobile switching center, the mobile switching center requires updating the location information of the mobile terminal.
  • a Tag field is added to the assignment request message to store a flag bit.
  • the flag is marked according to the service attribute of the mobile terminal.
  • the flag is marked in the mobile switching center, wherein in the step 1, the flag is marked in the home location register.
  • FIG. 5 is a flow chart of determining whether a soft handover message needs to be reported after a mobile terminal initiates a call according to the present invention
  • Figure 6 is a flow chart of determining whether a soft handover message needs to be reported after the mobile terminal is paged as a called party according to the present invention.
  • a method for preventing excessive traffic of an A interface soft handover message includes the following steps: Step S1, a mobile switching center (MSC) In the assignment request message sent to the base station (BS), a flag is added, the flag indicates whether the base station is required to report the soft handover message, so that the base station can determine, according to the flag bit, whether the user needs to report the soft handover message.
  • MSC mobile switching center
  • Step S2 after receiving the assignment request, the base station (BS) records the flag bit to indicate whether it is necessary to perform the handover : Handoff Performed; Step S3, the mobile terminal (MS) switches, notifying the base station (BS) or cell (CELL); Step S4, the base station (BS) determines whether to send a soft handover message to the mobile switching center (MSC) according to the flag bit recorded in step S2.
  • the method utilizes the mobile terminal (MS) to receive the assignment request message Assignment issued by the mobile switching center (MSC) whether it initiates a call or is called as a called user. Request, used to complete the assignment of the air channel and the terrestrial circuit.
  • a Tag field can be added to the Assignment Request message to store a flag bit, and the base station of the flag bit is determined according to the user. Whether the soft handover message Handoff Performed is reported, so that the message traffic of the UI interface can be effectively controlled. Because each mobile terminal has its own service attribute, it can be determined according to the service attribute whether the mobile switching center (MSC) requires the base station (BS) to report the soft handover message.
  • MSC mobile switching center
  • BS base station
  • the technical difficulty of controlling the message traffic of the A interface by using this method is small, because the mobile switching center (MSC) can easily query the service attribute of the user at the moment, and know whether the user needs the base station (BS) to report the soft handover message, In the matching request, the judgment structure is placed in the Tag field to the base station (BS); and the base station (BS) has no similar difficulty in implementing the similar function mechanism.
  • the present invention also provides the following two embodiments to determine whether the mobile switching center (MSC) controls the base station (BS) to determine the flag of the Handoff Performed message.
  • One is by indicating whether to indicate the flag of the soft handover message Handoff Performed in the mobile switching center (MSC), because the mobile switching center (MSC) has the service attribute of the registered mobile terminal, by determining whether the current service function is After the soft handover message needs to be reported, the flag indicating whether to report the soft handover message is marked according to the service attribute, and the identifier bit needs to be changed in the mobile switching center (MSC) to indicate whether the soft handover message needs to be sent.
  • the second is to directly indicate in the home location register (HLR) whether to report the flag of the soft handover message Handoff Performed, and then bring the flag to the mobile switching center (MSC) when the mobile terminal registers with the HLR, as shown in the figure.
  • HLR home location register
  • FIG. 5 is a flowchart of determining whether a soft handover message needs to be reported after a mobile terminal initiates a call according to the present invention. As shown in FIG.
  • Step 301 The mobile terminal (MS) utilizes the control channel on the air interface. Sending a request message to the base station (BS), requesting to initiate a call;
  • Step 302 After receiving the request information of the mobile terminal (MS), the base station (BS) replies with a message Confirming the message Base Station Ack Order to the mobile terminal (MS), indicating that the request has been processed to the mobile terminal (MS);
  • Step-by-step 304 After processing the base station (BS) call request, the mobile switching center (MSC) sends an assignment request message Assignment Request to the base station (BS), requesting the base station (BS) performing an assignment of an air channel and a terrestrial circuit, wherein a Tag field is added
  • Step 305 After receiving the assignment request message, the base station (BS) decodes the flag bit 5 in the Tag field and records the flag bit.
  • Step 306 The base station (BS) completes with the mobile terminal (MS) After the air channel is established, the ground circuit between the base station (BS) and the mobile switching center (MSC) is allocated; step 307: the base station (BS) moves to the mobile station The change center (MSC) sends an assignment request completion message Assignment Complete to enter a call state;
  • Step 309 The base station (BS) determines whether it is necessary to send a soft handover message Handoff Performed to the mobile switching center (MSC) according to the flag bit recorded in step 305.
  • Step 310 The base station (BS) sends a soft handover message Handoff Performed to the mobile switching center (MSC), requesting the mobile switching center (MSC) to update Location information related to the mobile terminal (MS).
  • MSC mobile switching center
  • MSC mobile switching center
  • 6 is a flow chart of determining whether a soft handover message needs to be reported after the mobile terminal is paged as a called party according to the present invention. It can be found that the mobile terminal acts as the called party and when it is the calling party, the Tag field is added in the assignment request message, and the BS performs different processing according to this field. As shown in FIG.
  • Step 401 When a mobile switching center (MSC) of a mobile user visited the terminal receives a call request from the user, sends a paging request to the base station (BS) to request a paging request;
  • Step 402 The base station (BS) receives the paging After the request, the paging message Page Message is sent to the mobile terminal (MS);
  • Step 403 After receiving the paging message, the mobile terminal (MS) determines the international mobile subscriber identity IMSI (International Mobile Subscriber) carried in the paging message.
  • IMSI International Mobile Subscriber
  • Step 404 The base station (BS) requests to establish to the mobile switching center ( The signaling connection of the MSC) sends a paging response message Paging Response to the mobile switching center (MSC);
  • Step 405 The base station (BS) sends a response message Base Station Ack Order to the mobile terminal (MS) to notify the mobile terminal (MS) The base station (BS) has received the paging response;
  • Step 406 The mobile switching center (MSC), after processing the paging response of the base station (BS), to the base station (BS) Sending an assignment request message Assignment Request, requesting the base station to perform assignment of the air channel and the ground circuit, wherein a Tag field is added to the Assignment Request message, and the determined value is saved in the Tag field.
  • the base station (BS) is required to report the flag of the soft handover message;
  • Step 407 After receiving the assignment request message, the base station (BS) decodes the flag bit in the Tag field and records the flag bit.
  • Step 410 The mobile terminal (MS) initiates a soft handover between two base stations (BSs) under the same mobile switching center (MSC), or a cell under the same base station (BS) (Cell a softer handover between the two; step 411: the base station (BS) determines whether the flag is recorded in step 305 The soft handover message Handoff Performed needs to be sent to the mobile switching center (MSC). If no transmission is needed, step 412 is skipped, and the soft handover message is not reported. Otherwise, step 412 is performed. Step 412: The base station (BS) sends the mobile switching center (MSC) to the mobile switching center (MSC).
  • MSC mobile switching center
  • Handoff Performed is sent to the Mobile Switching Center (MSC) to update the location information associated with the mobile terminal (MS).
  • MSC Mobile Switching Center
  • MSC Mobile Switching Center

Abstract

A method for avoiding overflow of A interface soft handover message includes: step1, adding a tag bit indicating whether require BS to report handover message in the indicating request message which is forwarded from BS to MSC; step2, the BS records the tag bit and signs whether the soft handover message need to be reported after the BS receives the indication message; step3, mobile terminal starts the handover with the BS or cell; step4, the BS judges whether the soft handover message is sent to the MSC according to the tag bit signed in the step2.

Description

一种防止 A接口软切换消息流量过大的方法 技术领域 本发明涉及移动通讯技术领域， 特别是 CDMA2000网络系统中移动交换 中心 （MSC)与基站（BS)之间 A接口 （移动交换中心与基站间接口）软切 换消息流量控制的方法。 背景技术 在 CDMA2000通信网络中， 无论移动终端在一次业务中， 是主叫用户还 是被叫用户，在用户进入指配完成空中信道和地面电路之后，当移动终端（MS) 发起同一个移动交换中心下的两个基站（BS)间软切换， 或者同一个基站下面 的小区（ Cell )之间的更软切换，基站都会上报软切换 Handoff Performed消息， 以便移动交换中心 （MSC)及时更新最新位置信息。 图 1 为现有技术中移动终端发起一个呼叫之后发生软切换且上 4艮软切换 消息的具体流程图， 如图 1所示， 在 CDMA2000通信网絡中， 一个移动终端 ( MS )发起一个呼叫之后发生软切换且上报软切换消息的具体流程如下： 步骤 101: 移动终端 （MS)在空中接口利用控制信道给基站 （BS)发起 请求信息 Origination Message , 要求发起一次呼叫； 步骤 102: 基站 （BS) 收到移动终端 （MS) 的请求信息之后， 回复一条 确认消息 Base Station Ack Order给移动终端 （ MS ), 显示已经开始处理移动终 端的清求； 步骤 103: 基站 （BS) 向移动交换中心 （MSC)发起移动终端的呼叫请 求 CM Service Request, 清求移动交换中心 (MSC)进行呼叫处理； 步驟 104: 移动交换中心 （MSC)在处理完基站 (BS) 的呼叫请求之后， 向基站 （BS)发送指配请求消息 AssignmentRequest, 要求基站 （ BS )进行空 中信道和地面电路的指配； 步骤 105: 基站（BS)在和移动终端 （MS) 完成空中信道建立之后， 分 配好基站（BS)到移动交换中心 （MSC)之间的地面电路； 步骤 106: 基站 （BS) 向移动交换中心 （MSC)发送指配请求完成消息 Assignment Complete , 进入通话状态； 步骤 107: 移动终端（MS)发起同一个移动交换中心下的两个基站（BS) 间软切换， 或者同一个基站 (BS) 下面的小区 （ Cell )之间的更软切换； 步骤 108: 基站（BS)向移动交换中心（MSC)发送软切换消息 Handoff Performed, 要求移动交换中心（MSC)更新移动终端（MS)相关的位置信息。 图 2 为现有技术中移动终端作为被叫被寻呼之后发生软切换且上 4艮软切 换消息的具体流程图， 如图 2所示， 在 CDMA2000通信网络中， 一个移动终 端（MS)作为被叫被寻呼之后发生软切换且上报软切换消息的具体流程如下： 步骤 201: 当某移动用户拜访地的移动交换中心（ MSC )收到该用户的终 呼请求后， 向基站（BS)发送寻呼请求 Paging Request; 步骤 202: 基站 （BS) 收到该寻呼请求后， 向移动终端 （MS)发起寻呼 消息 Page Message; 步骤 203: 移动终端 （MS)收到该寻呼消息后， 判断寻呼消息中所携带 的国际移动用户识别码 IMSI ( International Mobile Subscriber Identity ) 与自己 的国际移动用户识别码 ( International Mobile Subscriber Identity , IMSI )一致， 则向基占 ( BS )发送寻呼响应消息 Page Response Message; 步骤 204: 基站 （BS)请求建立到移动交换中心 （MSC) 的信令连接， 向移动交换中心 （ MSC )发送寻呼响应消息 Paging Response; 步骤 205: 基站 （ BS )给移动终端 （ MS ) 回复响应消息 Base Station Ack Order, 向移动终端 （MS)通知基站（BS) 已经收到寻呼响应； 步骤 206: 移动交换中心 （MSC)在处理完基站 （BS) 的寻呼响应后， 向基站 （BS)发送指配奇求消息 Assignment Request, 要求基站进行空中信道 和地面电路的指配； 步骤 207: 基站 （BS)在和移动终端 （MS) 完成空中信道建立之后， 分 配好基站（BS)到移动交换中心（MSC)之间的地面电路； 步骤 208: 基站 （BS) 向移动交换中心 （MSC)发送指配请求完成消息 Assignment Complete , 进入振铃状态； 步骤 209: 移动终端 ( MS )发起同一个移动交换中心 （MSC ) 下的两个 基站（ BS ) 间的软切换， 或者同一个基站（ BS )下面的小区 （ Cell )之间的更 软切换； 步骤 210: 基站（ BS )向移动交换中心（ MSC )发送软切换消息 Handoff Performed, 要求移动交换中心（MSC )更新移动终端（MS )相关的位置信息。 在现实应用中， 由于同一个移动交换中心 （MSC ) 下不同基站 （BS )之 间位置移动甚至小区（ Cell )之间的切换都会引起软切换消息 Handoff Performed 上报， 从而造成移动交换中心 （MSC ) 与基站 （BS )之间的 A接口消息量非 常大， 容易造成 A接口消息拥塞。 为了解决该问题， 目前有一种方法可以解决 A接口消息容易造成拥塞的 问题， 这种方法机制很简单， 即在基站（BS )设置开关， 根据业务需求， 控制 软切换消息 Handoff Performed的上报。 由于现有一^：语音、 短消息、 数据等普 通业务不需要基站 （BS )这种即时上报的位置信息， 仍然可以进行业务处理， 所以在移动交换中心（MSC )没有特殊要求的情况下， 可以在基站（BS )侧设 置开关， 不要求基站（BS )上报软切换消息 Handoff Performed, 这种方法的优 点显而易见， 即无须移动交换中心（MSC )改动， 只要在基站（BS )加上开关 即可控制 A接口的消息流量， 而不影响普通业务的实现。 但是， 这种方法也有 致命的缺点： 无法基于用户灵活选择是否需要上报软切换消息， 严重限制了很 多新功能的开发， 由于很多移动运营商提出的新功能需求比如移动性限制功 能、监听功能等， 都需要使用软切换消息 Handoff Performed上报的精确的小区 信息， 如果在基站不上 -软切换消息， 这些新业务功能就无法实现。 如果在基 站开关打开， 则所有用户的软切换消息都会上报， 这样势必又会引起 A接口消 息的拥塞。 发明内容 本发明的目的在于提供一种方法， 不需要基站 （ BS ) 和移动交换中心 ( MSC )做复杂改动 ,就可以实现基于用户灵活选择是否需要上报软切换消息， 这样就可以在不造成 A接口 （移动交换中心与基站间接口）软切换消息拥塞的 ^出上， 实现运营商提出的各种新功能需求。 为了实现上述目的， 本发明提供一种防止 A接口软切换消息流量过大的 方法， 包括： 步骤一、在移动交换中心向基站下发的指配请求消息中加入一个表示是否 要求基站上报软切换消息的标示位； 步骤二、基站收到指配请求之后， 对该标示位进行记录， 标明是否需要上 报软切换消息； 步骤三、 移动终端发起基站或小区进行切换； 步驟四、基站 #_据步骤二中所记录的标示位，来判断是否向移动交换中心 发送软切换消息。 其中， 在指配请求消息中增加一个 Tag字段来存放一个标示位。 其中， 在所述步骤一中， 根据移动终端的业务属性标记所述标示位。 其中 ,在所述步骤一中 ,其中在所述移动交换中心中 ^于所述标示位进行标 记。 其中，在所述步骤一中，其中在归属位置寄存器中对所述标示位进行标记。 本发明还提供一种主叫移动终端上报软切换消息的方法， 包括以下步骤： 移动终端向基站发起请求信息；基站收到请求信息后， 向移动终端回复确 认消息； 基站向移动交换中心发起移动终端的呼叫请求； 移动交换中心在处理 基站的呼叫请求之后， 向基站发送指配请求消息， 其中， 在该指配请求消息中 增加表示是否要求基站上报软切换消息的标示位； 基站收到指配请求消息之 后， 解码得到所述标示位， 并记录该标示位； 基站在和移动终端完成空中信道 建立并分配好基站到移动交换中心之间的地面电路； 基站向移动交换中心发送 指配请求完成消息； 移动终端发起基站或小区进行切换； 基站根据所记录的标 示位判断是否需要向移动交换中心发送软切换消息， 如果不需要则不上报软切 换消息， 否则执行下一步驟； 基站向移动交换中心发送软切换消息， 要求移动 交换中心更新移动终端的位置信息。 其中 , 在指配请求消息中增加一个 Tag字段来存放一个标示位。 其中， 在所述步骤一中， 根据移动终端的业务属性标记所述标示位。 其中，在所述步骤一中 ,其中在所述移动交换中心中对所述标示位进行标 记。 其中，在所述步骤一中，其中在归属位置寄存器中对所述标示位进行标记。 本发明还提供一种被叫移动终端上报软切换消息的方法, 包括以下步骤： 移动交换中心收到终呼请求后，向基站发送寻呼请求；基站收到该寻呼请 求后， 向移动终端发起寻呼消息； 移动终端收到该寻呼消息后， 向基站发送寻 呼响应消息； 基站向移动交换中心发送寻呼响应消息； 基站向移动终端回复响 应消息； 移动交换中心在处理基站的寻呼响应后， 向基站发送指配请求消息' 其中， 在该指配请求消息中增加表示是否要求基站上报软切换消息的标示位； 基站收到指配请求消息之后， 解码得到所述标示位， 并记录该标示位； 基站在 和移动终端完成空中信道建立并分配好基站到移动交换中心之间的地面电路； 基站向移动交换中心发送指配请求完成消息； 移动终端发起基站或小区进行切 换； 基站根据所记录的标示位判断是否需要向移动交换中心发送软切换消息 , 如果不需要则不上报软切换消息， 否则执行下一步驟； 基站向移动交换中心发 送软切换消息， 要求移动交换中心更新移动终端的位置信息。 其中， 在指配请求消息中增加一个 Tag字段来存放一个标示位。 其中， 在所述步骤一中， 才艮据移动终端的业务属性标 ΐ己所述标示位。 其中，在所述步骤一中，其中在所述移动交换中心中对所述标示位进 ^"标 记。 其中，在所述步 一中，其中在归属位置寄存器中对所述标示位进行标记。 本发明所提供的技术方案具有较大的业务灵活性， 即可以减少原来在 A 接口每个用户都上报软切换消息的消息流量； 又可以通过基于用户的业务属性 判断来实现各种不同业务功能的需求， 可以很好的满足不同用户的需求。 可以 实现基于用户业务属性的软切换消息 （ Handoff Performed ) 的上报， 有效地防 止了 A接口大量消息拥塞， 又能方便的实现各种业务功能。 附图说明 图 1 为现有技术中移动终端发起一个呼叫之后发生且上报软切换消息的 流程图； 图 2 为现有技术中移动终端作为被叫被寻呼之后发生且上报软切换消息 的流程图； 图 3为本发明的控制软切换消息的流程图； 图 4为根据本发明的移动终端的登记流程图； 图 5 为根据本发明的移动终端发起一个呼叫之后判断是否需要上报软切 换消息的流程图； 图 6 为根据本发明的移动终端作为被叫被寻呼之后判断是否需要上报软 切换消息的流程图。 具体实施方式 下面结合附图， 详细说明本发明的具体实施方式。 图 3为本发明的控制软切换消息的流程图，如图 3所示，本发明所提供的 一种防止 A接口软切换消息流量过大的方法包含以下步骤： 步驟 S1 , 移动交换中心（ MSC )在下发给基站（ BS )的指配请求消息中， 加入一个标示位， 该标示位表示是否要求基站上报软切换消息， 从而使得基站 可根据此标示位来判断该用户是否需要上报软切换消息 Handoff Performed; 步骤 S2, 基站 （BS ) 收到指配请求之后， 对该标示位进行记录， 标明是 否需要上^ :艮软切换消息 Handoff Performed; 步骤 S3 , 移动终端 （MS )发生切换， 通知基站 （BS ) 或小区 （CELL ); 步驟 S4, 基站 （BS ) 据步骤 S2 中所记录的标示位， 来判断是否给移 动交换中心 （ MSC )发送软切换消息。 该方法利用了移动终端 （MS )无论是主动发起一次呼叫或者作为被叫用 户被寻呼， 都会收到移动交换中心 （MSC ) 下发的指配请求消息 Assignment Request, 以用来完成空中信道和地面电路的指配， 所以， 可以在指配清求消息 Assignment Request中增加一个 Tag字段用来存放一个标示位， 居这个标示 位基站才艮据用户的不同决定是否上报软切换消息 Handoff Performed , 从而可以 有效的控制 Α接口的消息流量。 因为每个移动终端都具有自身的业务属性， 可 以根据业务属性来判断出此时移动交换中心（MSC )是否要求基站（BS )上报 软切换消息。 采用这种方法对 A接口的消息流量进行控制的技术难度小， 因为在移动 交换中心（MSC )容易查询到此刻用户的业务属性， 知道此用户是否需要基站 ( BS )上报软切换消息，在指配请求中将判断结构放在 Tag字段带给基站（ BS ) 即可； 而在基站（BS ) 由于先前已有类似功能机制， 所以实现起来没有难度。 此外， 本发明还提供如下两种实施方式来对移动交换中心 （MSC )控制 基站（BS )是否上 4艮软切换消息 Handoff Performed的标示位的进行判断。 其一是通过在移动交换中心（MSC )中标明是否上报软切换消息 Handoff Performed 的标示位， 因为此时移动交换中心 （MSC )具有已登记的移动终端 的业务属性， 其通过判定当前业务功能是否需要上报软切换消息后， 来根据该 业务属性标记表示是否上报软切换消息的标示位， 在此需要在移动交换中心 ( MSC ) 中对标示位进行改动， 以说明是否需要上 ^艮软切换消息； 其二是直接在归属位置寄存器 （HLR ) 中来标明是否上报软切换消息 Handoff Performed的标示位， 然后当移动终端到 HLR登记的时候将标示位带 给移动交换中心 （MSC ), 如附图 4所示， 其根据该业务属性标记表示是否上 报软切换消息的标示位， 由归属位置寄存器（ HLR )根据移动终端的业务属性， 判断是否上^ =艮软切换消息， 在登记响应时带给移动交换中心 （MSC ), 在此需 要对移动交换中心 （MSC )和归属位置寄存器（HLR ) 同时改动。 图 5 为根据本发明的移动终端发起一个呼叫之后判断是否需要上报软切 换消息的流程图。 如图 5 所示， # ^居本发明的移动终端 （MS )发起一个呼叫 之后发生软切换且上 ^艮软切换消息的具体流程如下： 步驟 301 : 移动终端 （MS )在空中接口利用控制信道给基站 （BS )发起 请求信息 Origination Message, 要求发起一次呼叫； 步骤 302: 基站（BS ) 收到移动终端 （MS ) 的请求信息之后， 回复一条 确认消息 Base Station Ack Order给移动终端 （ MS ), 显示已经开始处理给移动 终端 （MS ) 的请求； 步驟 303: 基站（BS ) 向移动交换中心 （MSC )发起移动终端的呼叫请 求 CM Service Request, 请求移动交换中心 （MSC )进行呼叫处理； 步-骤 304: 移动交换中心（ MSC )在处理完基站（ BS ) 的呼叫请求之后 , 向基站（BS )发送指配清求消息 Assignment Request, 要求基站（ BS )进行空 中信道和地面电路的指配， 其中， 在该指配清求消息 Assignment Request中增 加一个 Tag字段， 并在该 Tag字段中保存已经判定好的是否要求基站（ BS )上 报软切换消息的标示位； 步骤 305: 基站（ BS )收到指配请求消息之后， 解码得到 Tag字段中的标 示位 5 并记录该标示位 ^ 步骤 306: 基站（BS )在和移动终端 （MS ) 完成空中信道建立之后， 分 配好基站（BS )到移动交换中心 （MSC )之间的地面电路； 步驟 307: 基站 （BS ) 向移动交换中心 （MSC )发送指配请求完成消息 Assignment Complete , 进入通话状态； 步骤 308: 移动终端（MS )发起同一个移动交换中心下的两个基站（BS ) 间软切换， 或者同一个基站 （BS ) 下面的小区 （Cell )之间的更软切换； 步驟 309: 基站（BS )根据在步骤 305中记录下来的标示位， 来判断是否 需要向移动交换中心（MSC )发送软切换消息 Handoff Performed, 如果不需要 发送则跳过步骤 310, 不上报软切换消息， 否则执行步骤 310; 步骤 310: 基站 ( BS ) 向移动交换中心 （MSC )发送软切换消息 Handoff Performed, 要求移动交换中心（ MSC )更新移动终端（MS )相关的位置信息。 图 6 为根据本发明的移动终端作为被叫被寻呼之后判断是否需要上报软 切换消息的流程图。 可以发现移动终端作为被叫的实施方式和其作为主叫时都 是在指配请求消息中加入 Tag字段， BS根据这个字段做不同处理， 如图 6所 示， 在本发明中移动终端 （MS )作为被叫被寻呼之后发生软切换且上 ^艮软切 换消息的具体流程如下： 步驟 401: 当某移动用户拜访地的移动交换中心（ MSC )收到该用户的终 呼请求后， 向基站（BS)发送寻呼请求 Paging Request; 步骤 402: 基站（BS) 收到该寻呼请求后， 向移动终端 （MS)发起寻呼 消息 Page Message; 步骤 403: 移动终端 （MS) 收到该寻呼消息后， 判断寻呼消息中所携带 的国际移动用户识别码 IMSI ( International Mobile Subscriber Identity ) 与自己 的国际移动用户识别码 ( International Mobile Subscriber Identity , IMSI )一致， 则向基占 ( BS )发送寻呼响应消息 Page Response Message; 步骤 404: 基站 （BS)请求建立到移动交换中心 （MSC) 的信令连接， 向移动交换中心 （ MSC )发送寻呼响应消息 Paging Response; 步骤 405: 基站（ BS )给移动终端 （ MS ) 回复响应消息 Base Station Ack Order, 向移动终端 （MS)通知基站 (BS) 已经收到寻呼响应； 步骤 406: 移动交换中心 （MSC)在处理完基站 （BS) 的寻呼响应后， 向基站 （BS)发送指配清求消息 Assignment Request, 要求基站进行空中信道 和地面电路的指配， 其中 , 在该指配请求消息 Assignment Request中增加一个 Tag字段， 并在该 Tag字段中保存已经判定好的是否要求基站（ BS )上报软切 换消息的标示位； 步骤 407: 基站（ BS )收到指配请求消息之后， 解码得到 Tag字段中的标 示位 并记录该标示位 步骤 408: 基站 （BS)在和移动终端 （MS) 完成空中信道建立之后， 分 配好基站 (BS)到移动交换中心 （MSC)之间的地面电路； 步骤 409: 基站 （BS) 向移动交换中心 （MSC)发送指配请求完成消息 Assignment Complete , 进入振铃状态； 步骤 410: 移动终端 （MS)发起同一个移动交换中心 （MSC) 下的两个 基站（ BS ) 间的软切换， 或者同一个基站（ BS )下面的小区 （ Cell )之间的更 软切换； 步驟 411: 基站 ( BS )根据在步骤 305中记录下来的标示位， 来判断是否 需要向移动交换中心（MSC )发送软切换消息 Handoff Performed, 如果不需要 发送则跳过步骤 412, 不上报软切换消息， 否则执行步骤 412; 步骤 412: 基站（BS )向移动交换中心（MSC )发送软切换消息 Handoff Performed, 要求移动交换中心（ MSC )更新移动终端（MS )相关的位置信息。 当然，本发明还可有其他多种实施例，在不背离本发明精神及其实质的情 况下， 熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形， 但 这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 TECHNICAL FIELD The present invention relates to the field of mobile communication technologies, in particular, an A interface between a mobile switching center (MSC) and a base station (BS) in a CDMA2000 network system (between a mobile switching center and a base station) Interface) A method of soft switching message flow control. BACKGROUND In a CDMA2000 communication network, whether a mobile terminal is a calling user or a called user in a primary service, after the user enters the assignment to complete the air channel and the terrestrial circuit, when the mobile terminal (MS) initiates the same mobile switching center The soft handover between the two base stations (BSs) or the soft handover between the cells under the same base station, the base station reports a soft handover Handoff Performed message, so that the mobile switching center (MSC) can update the latest location information in time. . FIG. 1 is a specific flowchart of a soft handover and a top soft handover message after a mobile terminal initiates a call in the prior art. As shown in FIG. 1 , in a CDMA2000 communication network, a mobile terminal (MS) initiates a call. The specific process of soft handover and reporting the soft handover message is as follows: Step 101: The mobile terminal (MS) initiates a request message to the base station (BS) by using the control channel on the air interface, and requests to initiate a call; Step 102: The base station (BS) receives After the request information to the mobile terminal (MS), reply a confirmation message Base Station Ack Order to the mobile terminal (MS), indicating that the request for processing the mobile terminal has begun to be processed; Step 103: The base station (BS) to the mobile switching center (MSC) Initiating a call request CM Service Request of the mobile terminal, requesting the mobile switching center (MSC) to perform call processing; Step 104: The mobile switching center (MSC) sends a finger to the base station (BS) after processing the call request of the base station (BS) With the request message AssignmentRequest, the base station (BS) is required to perform assignment of the air channel and the terrestrial circuit; Step 105: Base station (BS) after the completion of the air channel establishment with the mobile terminal (MS), the ground circuit between the base station (BS) and the mobile switching center (MSC) is allocated; Step 106: The base station (BS) sends an assignment request completion message Assignment Complete to the mobile switching center (MSC) to enter a call state; Step 107: The mobile terminal (MS) initiates between two base stations (BS) under the same mobile switching center Soft handoff, or softer handoff between cells under the same base station (BS); Step 108: The base station (BS) sends a soft handoff message Handoff Performed to the mobile switching center (MSC), requesting the mobile switching center (MSC) Updating the location information associated with the mobile terminal (MS). 2 is a specific flowchart of a soft handover and a top soft handover message after a mobile terminal is paged as a called party in the prior art. As shown in FIG. 2, in a CDMA2000 communication network, a mobile terminal (MS) is used as a The specific process of the soft handover after the page is called and the soft handover message is reported is as follows: Step 201: When the mobile switching center (MSC) of the mobile user visited the terminal receives the terminal call request of the user, sends the message to the base station (BS). Paging request Paging Request; Step 202: After receiving the paging request, the base station (BS) initiates a paging message Page Message to the mobile terminal (MS); Step 203: After the mobile terminal (MS) receives the paging message, Determining that the International Mobile Subscriber Identity (IMSI) carried in the paging message is consistent with its International Mobile Subscriber Identity (IMSI), sending a paging response message to the base station (BS) Step 204: The base station (BS) requests to establish a signaling connection to the mobile switching center (MSC), and sends a search to the mobile switching center (MSC). Step 205: The base station (BS) replies to the mobile terminal (MS) with a response message Base Station Ack Order, notifying the mobile terminal (MS) that the base station (BS) has received the paging response; Step 206: Mobile switching center After processing the paging response of the base station (BS), the (MSC) sends an assignment request message to the base station (BS), requesting the base station to perform assignment of the air channel and the terrestrial circuit; Step 207: The base station (BS) is After the completion of the over-the-air channel establishment with the mobile terminal (MS), the ground circuit between the base station (BS) and the mobile switching center (MSC) is allocated; Step 208: The base station (BS) sends an assignment request to the mobile switching center (MSC). Message Assignment Complete, enters a ringing state; Step 209: The mobile terminal (MS) initiates a soft handover between two base stations (BSs) under the same mobile switching center (MSC), or a cell under the same base station (BS) (Cell a softer handover between the two; Step 210: The base station (BS) sends a Softswitch message Handoff Performed to the Mobile Switching Center (MSC), requesting the Mobile Switching Center (MSC) to update the location information associated with the Mobile Terminal (MS). In a real-world application, a mobile switching center (MSC) is caused by a handover between a different base station (BS) under the same mobile switching center (MSC) and even a handover between cells (Cells). The amount of A-interface messages between the base station (BS) and the base station (BS) is very large, which is likely to cause congestion of the A-interface message. In order to solve this problem, there is a method for solving the problem that the A-interface message is easy to cause congestion. The mechanism of the method is simple, that is, setting a switch at the base station (BS), and controlling the reporting of the soft handover message Handoff Performed according to service requirements. Since the existing services such as voice, short message, and data do not require the base station (BS) to directly report the location information, the service processing can still be performed. Therefore, if the mobile switching center (MSC) has no special requirements, Setting a switch on the base station (BS) side does not require the base station (BS) to report the soft handover message Handoff Performed. The advantage of this method is obvious, that is, no need to change the mobile switching center (MSC), as long as the switch is added at the base station (BS). Control the message traffic of the A interface without affecting the implementation of common services. However, this method also has fatal shortcomings: It is impossible to flexibly choose whether to report soft handover messages based on the user's flexibility, which severely limits the development of many new functions, because many mobile operators propose new functional requirements such as mobility restriction function, monitoring function, etc. All need to use the accurate cell information reported by the soft handover message Handoff Performed. If the base station does not - soft switch messages, these new service functions cannot be realized. If the switch of the base station is turned on, the soft handover message of all users will be reported, which will inevitably cause congestion of the A interface message. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for implementing a soft handover message based on a user's flexible selection without requiring a base station (BS) and a mobile switching center (MSC) to make complex changes, so that no A can be caused. The interface (the interface between the mobile switching center and the base station) soft-switches the congestion of the message, and realizes various new functional requirements put forward by the operator. In order to achieve the above object, the present invention provides a method for preventing excessive traffic of an A-interface soft handover message, including: Step 1: Adding, in the assignment request message sent by the mobile switching center to the base station, whether to require the base station to report soft handover Step 2: After receiving the assignment request, the base station records the identifier bit to indicate whether the soft handover message needs to be reported; Step 3: The mobile terminal initiates handover of the base station or the cell; Step 4: Base station #_ The flag bit recorded in step 2 is used to determine whether to send a soft handover message to the mobile switching center. Wherein, a Tag field is added to the assignment request message to store a flag bit. In the step 1, the flag bit is marked according to the service attribute of the mobile terminal. Wherein, in the step 1, wherein the marking bit is marked in the mobile switching center. Wherein, in the step one, the flag bit is marked in a home location register. The present invention further provides a method for a mobile terminal to report a soft handover message, comprising the following steps: The mobile terminal initiates request information to the base station; after receiving the request information, the base station replies with an acknowledgement message to the mobile terminal; the base station initiates a move to the mobile switching center. a call request of the terminal; after processing the call request of the base station, the mobile switching center sends an assignment request message to the base station, where a flag indicating whether the base station is required to report the soft handover message is added to the assignment request message; After the request message is allocated, the flag bit is decoded, and the flag bit is recorded; the base station completes the air channel establishment with the mobile terminal and allocates the ground circuit between the base station and the mobile switching center; the base station sends an assignment request to the mobile switching center. Completing the message; the mobile terminal initiates the handover of the base station or the cell; the base station determines whether it needs to send the soft handover message to the mobile switching center according to the recorded flag bit, and does not report the soft handover message if not required, otherwise performs the next step; Switching center sends soft cut Message, the mobile switching center requires updating the location information of the mobile terminal. Wherein, a Tag field is added to the assignment request message to store a flag bit. In the step 1, the flag bit is marked according to the service attribute of the mobile terminal. Wherein, in the first step, the flag bit is marked in the mobile switching center. Wherein, in the step one, the flag bit is marked in a home location register. The present invention further provides a method for a called mobile terminal to report a soft handover message, comprising the following steps: after receiving a terminal call request, the mobile switching center sends a paging request to the base station; after receiving the paging request, the base station sends the paging request to the mobile terminal. Initiating a paging message; after receiving the paging message, the mobile terminal sends a paging response message to the base station; the base station sends a paging response message to the mobile switching center; the base station replies to the mobile terminal with a response message; and the mobile switching center processes the base station After the response, the base station sends an assignment request message to the base station, where a flag indicating whether the base station is required to report the soft handover message is added to the assignment request message; after receiving the assignment request message, the base station decodes the identifier bit, And recording the flag bit; the base station completes the air channel establishment with the mobile terminal and allocates the ground circuit between the base station and the mobile switching center; the base station sends an assignment request completion message to the mobile switching center; the mobile terminal initiates the base station or the cell to perform handover; The base station determines whether it needs to move to the mobile switching center according to the recorded flag bits. Soft handover send the message, if no report message is not soft handoff, otherwise the next step; the base station sends a soft handover message to the mobile switching center, the mobile switching center requires updating the location information of the mobile terminal. Wherein, a Tag field is added to the assignment request message to store a flag bit. In the first step, the flag is marked according to the service attribute of the mobile terminal. In the first step, the flag is marked in the mobile switching center, wherein in the step 1, the flag is marked in the home location register. The technical solution provided by the invention has greater service flexibility, that is, the message traffic of the soft handover message reported by each user on the A interface can be reduced, and various service functions can be realized by determining the service attribute based on the user. The requirements of different users can be well satisfied. The report of the handoff Performed message based on the user service attribute can be implemented, which effectively prevents a large number of messages from being congested on the A interface, and can conveniently implement various service functions. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a soft handover message occurring after a mobile terminal initiates a call in the prior art; FIG. 2 is a flow chart of a prior art mobile terminal occurring as a called party after being paged and reporting a soft handover message; 3 is a flow chart of controlling a soft handover message according to the present invention; FIG. 4 is a flow chart of registration of a mobile terminal according to the present invention; and FIG. 5 is a flow chart of determining whether a soft handover message needs to be reported after a mobile terminal initiates a call according to the present invention; Figure 6 is a flow chart of determining whether a soft handover message needs to be reported after the mobile terminal is paged as a called party according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 3 is a flowchart of controlling a soft handover message according to the present invention. As shown in FIG. 3, a method for preventing excessive traffic of an A interface soft handover message according to the present invention includes the following steps: Step S1, a mobile switching center (MSC) In the assignment request message sent to the base station (BS), a flag is added, the flag indicates whether the base station is required to report the soft handover message, so that the base station can determine, according to the flag bit, whether the user needs to report the soft handover message. Handoff Performed; Step S2, after receiving the assignment request, the base station (BS) records the flag bit to indicate whether it is necessary to perform the handover : Handoff Performed; Step S3, the mobile terminal (MS) switches, notifying the base station (BS) or cell (CELL); Step S4, the base station (BS) determines whether to send a soft handover message to the mobile switching center (MSC) according to the flag bit recorded in step S2. The method utilizes the mobile terminal (MS) to receive the assignment request message Assignment issued by the mobile switching center (MSC) whether it initiates a call or is called as a called user. Request, used to complete the assignment of the air channel and the terrestrial circuit. Therefore, a Tag field can be added to the Assignment Request message to store a flag bit, and the base station of the flag bit is determined according to the user. Whether the soft handover message Handoff Performed is reported, so that the message traffic of the UI interface can be effectively controlled. Because each mobile terminal has its own service attribute, it can be determined according to the service attribute whether the mobile switching center (MSC) requires the base station (BS) to report the soft handover message. The technical difficulty of controlling the message traffic of the A interface by using this method is small, because the mobile switching center (MSC) can easily query the service attribute of the user at the moment, and know whether the user needs the base station (BS) to report the soft handover message, In the matching request, the judgment structure is placed in the Tag field to the base station (BS); and the base station (BS) has no similar difficulty in implementing the similar function mechanism. In addition, the present invention also provides the following two embodiments to determine whether the mobile switching center (MSC) controls the base station (BS) to determine the flag of the Handoff Performed message. One is by indicating whether to indicate the flag of the soft handover message Handoff Performed in the mobile switching center (MSC), because the mobile switching center (MSC) has the service attribute of the registered mobile terminal, by determining whether the current service function is After the soft handover message needs to be reported, the flag indicating whether to report the soft handover message is marked according to the service attribute, and the identifier bit needs to be changed in the mobile switching center (MSC) to indicate whether the soft handover message needs to be sent. The second is to directly indicate in the home location register (HLR) whether to report the flag of the soft handover message Handoff Performed, and then bring the flag to the mobile switching center (MSC) when the mobile terminal registers with the HLR, as shown in the figure. 4, according to the service attribute tag, indicating whether to report the flag bit of the soft handover message, and determining, by the home location register (HLR), whether to send a soft handover message according to the service attribute of the mobile terminal, when the registration response is sent Mobile Switching Center (MSC), where it is required to send the Mobile Switching Center (MSC) and home location The register (HLR) is changed at the same time. FIG. 5 is a flowchart of determining whether a soft handover message needs to be reported after a mobile terminal initiates a call according to the present invention. As shown in FIG. 5, the specific procedure of the soft handover and the soft handover message after the mobile terminal (MS) of the present invention initiates a call is as follows: Step 301: The mobile terminal (MS) utilizes the control channel on the air interface. Sending a request message to the base station (BS), requesting to initiate a call; Step 302: After receiving the request information of the mobile terminal (MS), the base station (BS) replies with a message Confirming the message Base Station Ack Order to the mobile terminal (MS), indicating that the request has been processed to the mobile terminal (MS); Step 303: The base station (BS) initiates a call request CM Service Request of the mobile terminal to the mobile switching center (MSC), Requesting a mobile switching center (MSC) to perform call processing; Step-by-step 304: After processing the base station (BS) call request, the mobile switching center (MSC) sends an assignment request message Assignment Request to the base station (BS), requesting the base station (BS) performing an assignment of an air channel and a terrestrial circuit, wherein a Tag field is added to the Assignment Request message, and the Tag field is saved in the Tag field to determine whether the base station (BS) is required to report the soft handover. Step 305: After receiving the assignment request message, the base station (BS) decodes the flag bit 5 in the Tag field and records the flag bit. Step 306: The base station (BS) completes with the mobile terminal (MS) After the air channel is established, the ground circuit between the base station (BS) and the mobile switching center (MSC) is allocated; step 307: the base station (BS) moves to the mobile station The change center (MSC) sends an assignment request completion message Assignment Complete to enter a call state; Step 308: The mobile terminal (MS) initiates soft handover between two base stations (BSs) under the same mobile switching center, or the same base station (BS) a softer handover between the following cells (Cell); Step 309: The base station (BS) determines whether it is necessary to send a soft handover message Handoff Performed to the mobile switching center (MSC) according to the flag bit recorded in step 305. If the transmission is not required, step 310 is skipped, and the soft handover message is not reported, otherwise step 310 is performed; Step 310: The base station (BS) sends a soft handover message Handoff Performed to the mobile switching center (MSC), requesting the mobile switching center (MSC) to update Location information related to the mobile terminal (MS). 6 is a flow chart of determining whether a soft handover message needs to be reported after the mobile terminal is paged as a called party according to the present invention. It can be found that the mobile terminal acts as the called party and when it is the calling party, the Tag field is added in the assignment request message, and the BS performs different processing according to this field. As shown in FIG. 6, in the present invention, the mobile terminal (MS) The specific process of soft handover and the soft handover message after the called party is paged is as follows: Step 401: When a mobile switching center (MSC) of a mobile user visited the terminal receives a call request from the user, sends a paging request to the base station (BS) to request a paging request; Step 402: The base station (BS) receives the paging After the request, the paging message Page Message is sent to the mobile terminal (MS); Step 403: After receiving the paging message, the mobile terminal (MS) determines the international mobile subscriber identity IMSI (International Mobile Subscriber) carried in the paging message. Identity) is consistent with its own International Mobile Subscriber Identity (IMSI), and sends a page response message to the base station (BS). Step 404: The base station (BS) requests to establish to the mobile switching center ( The signaling connection of the MSC) sends a paging response message Paging Response to the mobile switching center (MSC); Step 405: The base station (BS) sends a response message Base Station Ack Order to the mobile terminal (MS) to notify the mobile terminal (MS) The base station (BS) has received the paging response; Step 406: The mobile switching center (MSC), after processing the paging response of the base station (BS), to the base station (BS) Sending an assignment request message Assignment Request, requesting the base station to perform assignment of the air channel and the ground circuit, wherein a Tag field is added to the Assignment Request message, and the determined value is saved in the Tag field. The base station (BS) is required to report the flag of the soft handover message; Step 407: After receiving the assignment request message, the base station (BS) decodes the flag bit in the Tag field and records the flag bit. Step 408: The base station (BS) is in the After the mobile terminal (MS) completes the air channel establishment, the ground circuit between the base station (BS) and the mobile switching center (MSC) is allocated; Step 409: The base station (BS) sends an assignment request completion message to the mobile switching center (MSC). Assignment Complete, enters a ringing state; Step 410: The mobile terminal (MS) initiates a soft handover between two base stations (BSs) under the same mobile switching center (MSC), or a cell under the same base station (BS) (Cell a softer handover between the two; step 411: the base station (BS) determines whether the flag is recorded in step 305 The soft handover message Handoff Performed needs to be sent to the mobile switching center (MSC). If no transmission is needed, step 412 is skipped, and the soft handover message is not reported. Otherwise, step 412 is performed. Step 412: The base station (BS) sends the mobile switching center (MSC) to the mobile switching center (MSC). Handoff Performed is sent to the Mobile Switching Center (MSC) to update the location information associated with the mobile terminal (MS). The invention may, of course, be embodied in a variety of other embodiments without departing from the spirit and scope of the invention. Changes and modifications are intended to be included within the scope of the appended claims.

Claims

权 利 要 求 书 Claim
1. 一种防止 A接口软切换消息流量过大的方法， 其特征在于， 包括： 步骤一、在移动交换中心向基站下发的指配请求消息中加入一个表 示是否要求基站上报软切换消息的标示位； A method for preventing an A-interface soft handover message from being excessively large, and the method includes the following steps: Step 1: Adding, in the assignment request message sent by the mobile switching center to the base station, whether the base station is required to report the soft handover message Marking position
步骤二、 基站收到指配请求之后， 对该标示位进行记录， 标明是否 需要上报软切换消息；  Step 2: After receiving the assignment request, the base station records the identifier bit to indicate whether the soft handover message needs to be reported;
步骤三、 移动终端发起基站或小区进行切换；  Step 3: The mobile terminal initiates handover of the base station or the cell;
步骤四、基站根据步驟二中所记录的标示位， 来判断是否向移动交 换中心发送软切换消息。  Step 4: The base station determines, according to the flag bit recorded in step 2, whether to send a soft handover message to the mobile switching center.
2. 如权利要求 1所述的方法， 其特征在于， 其中在指配请求消息中增加一 个 Tag字段来存放一个标示位。 The method according to claim 1, wherein a tag field is added to the assignment request message to store a flag bit.
3. 如权利要求 1或 2所述的方法， 其特征在于， 在所述步骤一中， 根据移 动终端的业务属性标记所述标示位。 The method according to claim 1 or 2, wherein in the step 1, the flag bit is marked according to a service attribute of the mobile terminal.
4. 如权利要求 3所述的方法， 其特征在于， 在所述步骤一中， 其中在所述 移动交换中心中对所述标示位进行标记。 The method according to claim 3, wherein in the step 1, wherein the flag bit is marked in the mobile switching center.
5. 如权利要求 3所述的方法， 其特征在于， 在所述步 一中， 其中在归属 位置寄存器中对所述标示位进行标记。 The method according to claim 3, wherein in the step 1, the flag bit is marked in a home location register.
6. 一种主叫移动终端上 4艮软切换消息的方法， 包括以下步骤： 6. A method for calling a soft handover message on a mobile terminal, comprising the following steps:
移动终端向基站发起请求信息；  The mobile terminal initiates request information to the base station;
基站收到请求信息后， 向移动终端回复确认消息；  After receiving the request information, the base station sends a confirmation message to the mobile terminal;
基站向移动交换中心发起移动终端的呼叫请求；  The base station initiates a call request of the mobile terminal to the mobile switching center;
移动交换中心在处理基站的呼叫请求之后，向基站发送指配请求消 息， 其中， 在该指配请求消息中增加表示是否要求基站上报软切换消息 的标示位；  After processing the call request of the base station, the mobile switching center sends an assignment request message to the base station, where a flag indicating whether the base station is required to report the soft handover message is added to the assignment request message;
基站收到指配请求消息之后， 解码得到所述标示位， 并记录该标示 位； 基站在和移动终端完成空中信道建立并分配好基站到移动交换中 心之间的地面电路； After receiving the assignment request message, the base station decodes the flag bit, and records the flag bit; The base station completes the air channel establishment with the mobile terminal and allocates the ground circuit between the base station and the mobile switching center;
基站向移动交换中心发送指配请求完成消息；  The base station sends an assignment request completion message to the mobile switching center;
移动终端发起基站或小区进行切换；  The mobile terminal initiates handover of the base station or the cell;
基站根据所记录的标示位判断是否需要向移动交换中心发送软切 换消息， 如果不需要则不上报软切换消息， 否则执行下一步骤；  The base station determines, according to the recorded flag bit, whether it needs to send a soft handoff message to the mobile switching center, and does not report the soft handoff message if not required, otherwise performs the next step;
基站向移动交换中心发送软切换消息，要求移动交换中心更新移动 终端的位置信息。  The base station sends a soft handover message to the mobile switching center, requesting the mobile switching center to update the location information of the mobile terminal.
7. 如权利要求 6所述的方法， 其特征在于， 其中在指配请求消息中增加一 个 Tag字段来存放一个标示位。 The method according to claim 6, wherein a tag field is added to the assignment request message to store a flag bit.
8. 如权利要求 6或 7所述的方法， 其特征在于， 在所述步 一中， 根据移 动终端的业务属性标记所述标示位。 The method according to claim 6 or 7, wherein in the step 1, the flag bit is marked according to a service attribute of the mobile terminal.
9. 如权利要求 8所述的方法， 其特征在于， 在所述步骤一中， 其中在所迷 移动交换中心中对所述标示位进行标记。 9. The method of claim 8, wherein in the step one, the flag bit is marked in the mobile switching center.
10. 如权利要求 8所述的方法， 其特征在于， 在所述步骤一中， 其中在归属 位置寄存器中 ^"所述标示位进行标 i己。 10. The method according to claim 8, wherein in the step 1, wherein the flag bit is marked in the home location register.
11. 一种被叫移动终端上报软切换消息的方法， 包括以下步 -骤：  11. A method for a called mobile terminal to report a soft handover message, comprising the following steps:
移动交换中心收到终呼请求后， 向基站发送寻呼请求； 基站收到该寻呼请求后， 向移动终端发起寻呼消息； 移动终端收到该寻呼消息后， 向基站发送寻呼响应消息； 基站向移动交换中心发送寻呼响应消息；  After receiving the terminal call request, the mobile switching center sends a paging request to the base station; after receiving the paging request, the base station initiates a paging message to the mobile terminal; after receiving the paging message, the mobile terminal sends a paging response to the base station. a message; the base station sends a paging response message to the mobile switching center;
基站向移动终端回复响应消息；  The base station replies to the mobile terminal with a response message;
移动交换中心在处理基站的寻呼响应后 , 向基站发送指配请求消 息， 其中， 在该指配请求消息中增加表示是否要求基站上报软切换消息 的标示位；  After processing the paging response of the base station, the mobile switching center sends an assignment request message to the base station, where a flag indicating whether the base station is required to report the soft handover message is added to the assignment request message;
基站收到指配请求消息之后， 解码得到所述标示位， 并记录该标示 位； 基站在和移动终端完成空中信道建立并分配好基站到移动交换中 心之间的地面电路； After receiving the assignment request message, the base station decodes the flag bit, and records the flag bit; The base station completes the air channel establishment with the mobile terminal and allocates the ground circuit between the base station and the mobile switching center;
基站向移动交换中心发送指配请求完成消息；  The base station sends an assignment request completion message to the mobile switching center;
移动终端发起基站或小区进行切换；  The mobile terminal initiates handover of the base station or the cell;
基站根据所记录的标示位判断是否需要向移动交换中心发送软切 换消息， 如果不需要则不上^ :艮软切换消息， 否则执行下一步骤； The base station determines, according to the recorded flag bit, whether it needs to send a soft handover message to the mobile switching center, and if not, does not : ^ : soft handover message, otherwise performs the next step;
基站向移动交换中心发送软切换消息，要求移动交换中心更新移动 终端的位置信息。  The base station sends a soft handover message to the mobile switching center, requesting the mobile switching center to update the location information of the mobile terminal.
12. 如权利要求 11所述的方法， 其特征在于， 其中在指配请求消息中增加一 个 Tag字段来存放一个标示位。 The method according to claim 11, wherein a tag field is added to the assignment request message to store a flag bit.
13. 如权利要求 11或 12所述的方法， 其特征在于， 在所述步骤一中， 居 移动终端的业务属性标 i己所述标示位。 The method according to claim 11 or 12, wherein in the step 1, the service attribute of the mobile terminal is marked with the flag.
14. 如权利要求 13所述的方法， 其特征在于， 在所述步骤一中， 其中在所述 移动交换中心中对所述标示位进行标记。 The method according to claim 13, wherein in the step 1, wherein the flag bit is marked in the mobile switching center.
15. 如权利要求 13所述的方法， 其特征在于， 在所述步骤一中， 其中在归属 位置寄存器中对所述标示位进行标记。 15. The method of claim 13, wherein in the step one, the flag bit is marked in a home location register.
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