CN101128053B

Movatterモバイル変換

Info

Publication number: CN101128053B
Application number: CN2007101420378A
Authority: CN
Inventors: 王海磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-08-20
Filing date: 2007-08-20
Publication date: 2010-08-18
Anticipated expiration: 2027-08-20
Also published as: CN101128053A

Abstract

The utility model discloses a method for switching between the control systems of the core network, which is characterized in that when setting up the calling process, the core network can obtain the user information of the calling party and understand that according to the corresponding relation of the preset user information and the switching type, the core network can transmit the business switching unit to the calling party at the same time when the core network returning the assigned request messages born by the empty ports to the calling party if the corresponding switching type is allowed to switch between the systems; when the core network transmit the switched request message to the side of the switching destination, the business switching unit is also transmitted in company with the switched request message to the side of the switching destination for switching between the systems. The utility model also discloses the network elements and the systems that can be switched between the control systems. The utility model has the advantages of flexible switching control between systems according to different contents of the user information, differential services for users with different types in different networks and reasonable network resource utilization.

Description

Translated fromChinese

核心网控制系统间切换的方法、网元及系统Method, network element and system for switching between core network control systems

技术领域technical field

本发明涉及移动通信领域中控制不同系统间的呼叫切换，尤其涉及一种核心网控制系统间切换的方法、网元及系统。The invention relates to controlling call switching between different systems in the field of mobile communication, in particular to a method, network element and system for core network control switching between systems.

背景技术Background technique

在目前通信网络系统中，3G网络系统和2G网络系统并存，在3G网络系统及2G网络系统中存在共有业务。因此，可在两个网络之间分配不同的业务/用户，比如把视频业务放到新建的3G网络中进行，把USIM卡用户放到3G网络中，或者把一些负载严重的2G小区用户放到3G网络中等。In the current communication network system, the 3G network system and the 2G network system coexist, and there are common services in the 3G network system and the 2G network system. Therefore, different services/users can be allocated between the two networks, such as placing video services on the newly built 3G network, putting USIM card users on the 3G network, or putting some heavily loaded 2G cell users on the 3G network. The 3G network is moderate.

目前，现有技术提出了接入网根据业务切换信元可以控制是否发起系统间切换的方法，具体为：当系统支持系统间切换的时候，核心网的移动交换中心(MSC)在下发的指配消息中携带业务切换(Service Handover)信元，当基站子系统(BSS)接收到包含所述Service Handover信元的指配消息时，存储该信元并根据该信元指令的信息决定是否发起系统间切换。当所述Service Handover信元的值为允许切换指令时，则所述接入网发起系统间的切换；否则，不切换。At present, the prior art proposes a method in which the access network can control whether to initiate inter-system handover according to the service handover cell, specifically: when the system supports inter-system handover, the mobile switching center (MSC) of the core network issues instructions The service handover (Service Handover) information element is carried in the allocation message, and when the base station subsystem (BSS) receives the assignment message containing the Service Handover information element, it stores the information element and decides whether to initiate according to the information of the information element instruction Switch between systems. When the value of the Service Handover information element is an instruction to allow handover, the access network initiates handover between systems; otherwise, no handover is performed.

在进行本发明创造过程中，发明人发现现有技术中至少存在如下问题：During the creation process of the present invention, the inventor found that at least the following problems existed in the prior art:

现有技术给出了一种接入侧如何发起系统间切换的方法，即通过MSC指示的业务切换信元可以控制系统间切换的发起与否。The prior art provides a method of how the access side initiates an inter-system handover, that is, the service handover information element indicated by the MSC can control whether the inter-system handover is initiated or not.

然而，现有技术中对系统间切换的形式比较单一，不能根据具体的网络情况、用户情况或业务情况进行灵活的切换控制，因此不能更好地满足网络的合理应用。However, in the prior art, the form of inter-system handover is relatively simple, and flexible handover control cannot be performed according to specific network conditions, user conditions or business conditions, so it cannot better meet the rational application of the network.

发明内容Contents of the invention

有鉴于此，本发明实施例的目的在于提供一种核心网控制系统间切换的方法、网元及系统。In view of this, the purpose of the embodiments of the present invention is to provide a core network control method, network element and system for handover between systems.

本发明实施例提供的一种核心网控制系统间切换的方法，包括：A method for switching between core network control systems provided by an embodiment of the present invention includes:

在呼叫建立过程中，核心网获取呼叫方的用户信息，根据预置的该用户信息与切换类型的对应关系获知，当与所述用户信息对应的切换类型为允许系统间切换时，During the call establishment process, the core network obtains the user information of the calling party, and learns according to the preset correspondence between the user information and the handover type. When the handover type corresponding to the user information is to allow inter-system handover,

则所述核心网在向所述呼叫方返回空口承载指配请求消息时，将业务切换信元随同该空口承载指配请求消息发送至所述呼叫方；及所述核心网在向切换的目标侧发送切换请求消息时，将业务切换信元随同该发送切换请求消息发送至所述切换的目标侧进行系统间的切换。Then, when the core network returns an air interface bearer assignment request message to the calling party, it sends a service switching cell along with the air interface bearer assignment request message to the calling party; and the core network is switching to the target When the side sends the handover request message, it sends the service handover information element along with the handover request message to the handover target side to perform inter-system handover.

基于上述技术方案，本发明实施例还公开了一种核心网中能够控制系统间切换的网元，包括：Based on the above technical solution, the embodiment of the present invention also discloses a network element capable of controlling switching between systems in the core network, including:

切换类型存储单元，用于存储预置的用户信息与切换类型的对应关系；The switching type storage unit is used to store the corresponding relationship between the preset user information and the switching type;

用户信息获取单元，用于在呼叫建立过程中，获取呼叫方的用户信息，并将所述用户信息告知切换类型判断单元；A user information acquiring unit, configured to acquire the user information of the calling party during the call setup process, and notify the handover type judging unit of the user information;

所述切换类型判断单元，用于收到所述用户信息后，根据所述切换类型存储单元中该用户信息与切换类型的对应关系获知，当与所述用户信息对应的切换类型为允许系统间切换时，将允许切换的判断结果告知业务切换信元生成单元；The handover type judging unit is configured to obtain, after receiving the user information, according to the correspondence between the user information and the handover type in the handover type storage unit, when the handover type corresponding to the user information is to allow inter-system When switching, inform the service switching cell generation unit of the judgment result of allowing the switching;

所述业务切换信元生成单元，用于在收到所述允许切换的判断结果后，生成业务切换信元，并将所述业务切换信元随同空口承载指配请求消息发送至所述呼叫方，及将所述业务切换信元随同该发送切换请求消息发送至所述切换的目标侧。The service switching cell generating unit is configured to generate a service switching cell after receiving the judgment result of allowing the switching, and send the service switching cell to the calling party along with an air interface bearer assignment request message , and sending the service switching information element together with the sending switching request message to the switching target side.

与此同时，本发明实施例还公开了一种能够控制系统间切换的系统，包括：核心网、呼叫方、以及位于所述核心网中的能够控制系统间切换的网元，其中，所述呼叫方向所述核心网发起呼叫，位于所述核心网中的所述网元包括：At the same time, the embodiment of the present invention also discloses a system capable of controlling handover between systems, including: a core network, a calling party, and a network element in the core network capable of controlling handover between systems, wherein the The caller initiates a call to the core network, and the network elements located in the core network include:

与现有技术相比，本发明实施例具有以下优点：Compared with the prior art, the embodiment of the present invention has the following advantages:

本发明实施例能够根据用户信息与切换类型的对应关系判决是否允许系统间切换，并且在当允许系统间切换时，将业务切换信元随同空口承载指配请求消息、及切换请求消息分别发送至所述呼叫方、及切换的目标侧进行系统间的切换。本发明实施例中，核心网能够根据用户信息中不同内容灵活控制系统间切换，使不同类型的用户在不同网络实现差异化服务，以达到网络合理利用的目的，实现小区负载的均衡。The embodiment of the present invention can judge whether to allow inter-system handover according to the corresponding relationship between user information and handover type, and when the inter-system handover is allowed, send the service handover information element together with the air interface bearer assignment request message and the handover request message to the The caller and the handover target side perform inter-system handover. In the embodiment of the present invention, the core network can flexibly control switching between systems according to different content in user information, so that different types of users can implement differentiated services on different networks, so as to achieve the purpose of rational network utilization and balance cell load.

附图说明Description of drawings

图1为本发明核心网控制系统间切换的一个方法实施例的流程图；Fig. 1 is a flowchart of a method embodiment of switching between core network control systems of the present invention;

图2为本发明核心网控制系统间切换的另一个方法实施例的流程图；FIG. 2 is a flow chart of another method embodiment of switching between core network control systems according to the present invention;

图3为本发明核心网控制系统间切换的另一个方法实施例的流程图；3 is a flow chart of another method embodiment of switching between core network control systems according to the present invention;

图4为本发明核心网中能够控制系统间切换的一个网元实施例的结构框图；4 is a structural block diagram of an embodiment of a network element capable of controlling handover between systems in the core network of the present invention;

图5为本发明核心网中能够控制系统间切换的另一个网元实施例的结构框图；FIG. 5 is a structural block diagram of another network element embodiment capable of controlling handover between systems in the core network of the present invention;

图6为本发明能够控制系统间切换的一个系统实施例的结构框图。FIG. 6 is a structural block diagram of an embodiment of a system capable of controlling handover between systems according to the present invention.

具体实施方式Detailed ways

本发明实施例公开的一种使用核心网控制系统间切换的方法，包括：在呼叫建立过程中，核心网获取呼叫方的用户信息，根据预置的该用户信息与切换类型的对应关系获知，当与所述用户信息对应的切换类型为允许系统间切换时，A method for controlling inter-system switching using a core network disclosed in an embodiment of the present invention includes: during the call establishment process, the core network acquires user information of the calling party, and acquires it according to the preset correspondence between the user information and the switching type, When the handover type corresponding to the user information is to allow handover between systems,

其中，当所述呼叫方为主叫用户时，所述核心网可从接收到的主叫用户发来的业务请求消息，和/或呼叫建立消息中获取主叫用户的用户信息，所述业务请求消息的用户信息至少包括：用户的接入区域、用户的国际移动用户标识码(IMSI)；所述呼叫建立消息的用户信息至少包括：用户的呼叫业务类型。Wherein, when the calling party is the calling user, the core network may obtain the calling user's user information from the service request message received from the calling user and/or the call establishment message, and the service The user information of the request message includes at least: the user's access area and the user's International Mobile Subscriber Identity (IMSI); the user information of the call setup message includes at least: the user's call service type.

其中，当所述呼叫方为被叫用户时，所述核心网可从被叫用户发来的寻呼响应消息和/或呼叫证实消息中获取被叫用户的用户信息。Wherein, when the calling party is the called user, the core network may acquire the user information of the called user from a paging response message and/or a call confirmation message sent by the called user.

本发明实施例中核心网能够根据用户IMSI类型，用户发起的业务类型(比如语音呼叫，视频呼叫，低速的数据业务，高速的数据业务等)等用户信息分别或者相互组合判断该呼叫方发起的业务请求是否为系统间切换，以便业务切换信元的配置。从而能够灵活地控制从全球移动通信GSM系统到通用移动通信UMTS系统的切换，或从UMTS系统到GSM系统的切换。使不同IMSI类型的用户、不同业务的用户以及其他不同类型的用户在不同的网络实现差异化服务，达到网络合理利用的目的，实现小区负载的均衡。In the embodiment of the present invention, the core network can determine the user information initiated by the caller according to user information such as the user IMSI type and the type of service initiated by the user (such as voice call, video call, low-speed data service, high-speed data service, etc.) or in combination with each other. Whether the service request is an inter-system handover, so as to configure the service handover cells. Therefore, the handover from the GSM system to the UMTS system, or the handover from the UMTS system to the GSM system can be flexibly controlled. Enable users of different IMSI types, users of different services, and other users of different types to implement differentiated services on different networks, achieve the purpose of rational network utilization, and realize cell load balancing.

由于本发明实施例中所述呼叫方可以为主叫用户，也可以是被叫用户，因此，为方便说明，下面实施例中的呼叫方均以主叫用户为例，详细说明核心网是如何根据用户信息来控制系统间切换的。Since the calling party described in the embodiment of the present invention can be the calling user or the called user, therefore, for the convenience of explanation, the calling party in the following embodiments all take the calling user as an example to describe in detail how the core network is Switching between systems is controlled according to user information.

如图1所示，其为本发明核心网控制系统切换的一个方法实施例的流程图，该方法为用户从2G系统始发呼叫，核心网根据该用户发起的业务请求消息(Service_Request)，以及呼叫建立消息(SETUP)中的用户信息，将呼叫切换到3G系统中，本实施例中所述核心网可以为移动交换中心(MSC)，设2G系统中的基站(BSC)作为呼叫方，3G系统中的无线网络控制器(RNC)作为切换方，该方法包括以下步骤：As shown in Figure 1, it is the flow chart of a method embodiment of core network control system handover of the present invention, and this method is that the user initiates a call from the 2G system, and the core network initiates a service request message (Service_Request) according to the user, and The user information in the call setup message (SETUP) is used to switch the call to the 3G system. The core network described in this embodiment can be a mobile switching center (MSC), and the base station (BSC) in the 2G system is set as the caller, and the 3G system The radio network controller (RNC) in the system is as handover party, and this method comprises the following steps:

步骤101：2G系统中的用户发起呼叫，BSC向MSC发送业务请求消息(Service_Request)。所述业务请求消息中至少包括用户的接入区域，及用户的国际移动用户标识码(IMSI)等信息。Step 101: A user in the 2G system initiates a call, and the BSC sends a service request message (Service_Request) to the MSC. The service request message at least includes information such as the user's access area and the user's International Mobile Subscriber Identity (IMSI).

步骤102：所述MSC在收到所述业务请求消息后，向所述BSC返回一个业务接受消息(Service_Accept)，通知用户可以发起呼叫。Step 102: After receiving the service request message, the MSC returns a service acceptance message (Service_Accept) to the BSC to notify the user that a call can be initiated.

步骤103：所述BSC在收到该业务接受消息后，向所述MSC发送呼叫建立消息(SETUP)，该消息至少包括用户的呼叫业务类型。其中，所述呼叫业务类型可分为语音或数据等类型。Step 103: After receiving the service acceptance message, the BSC sends a call setup message (SETUP) to the MSC, and the message at least includes the call service type of the user. Wherein, the call service type can be divided into types such as voice or data.

步骤104：所述MSC在收到所述用户的呼叫建立消息后，向所述BSC返回一个呼叫正在进行消息(Call_Proceeding)，指示用户呼叫正在接续过程中。Step 104: After receiving the call setup message from the user, the MSC returns a call in progress message (Call_Proceeding) to the BSC, indicating that the call of the user is being connected.

步骤105：所述MSC从所述业务请求消息和/或呼叫建立消息中获取用户信息，根据预置的该用户信息与切换类型的对应关系判断是否允许系统间切换，当与所述用户信息对应的切换类型为允许系统间切换时，则选定业务切换信元的值为允许切换，并且所述MSC在为主叫用户分配完地面资源后，执行步骤106。其中，所述业务切换信元的值还可包括：可以切换但尽量不切换和不允许切换两种。Step 105: The MSC acquires user information from the service request message and/or call setup message, and judges whether inter-system handover is allowed according to the preset correspondence between the user information and the handover type, and when the corresponding user information corresponds to When the handover type of is to allow inter-system handover, the value of the selected service handover cell is to allow handover, and the MSC executes step 106 after allocating ground resources for the calling user. Wherein, the value of the service switching information element may also include: switching is possible but switching is not possible and switching is not allowed.

其中，所述MSC根据预置的该用户信息与切换类型的对应关系，获知用户信息对应的切换类型为允许系统间切换的方法例如：Wherein, according to the preset correspondence between the user information and the handover type, the MSC learns that the handover type corresponding to the user information is a method for allowing handover between systems, for example:

如果所述MSC从所述主叫用户的业务请求消息中获知，该用户所在的接入区域为允许切换的区域，或者获知该用户的IMSI为允许切换的标识；或者，If the MSC learns from the calling user's service request message that the access area where the user is located is an area that allows handover, or learns that the user's IMSI is an identifier that allows handover; or,

如果所述MSC从所述主叫用户的呼叫建立消息中获知，该用户的呼叫业务类型对应的是允许系统间切换；或者，If the MSC learns from the calling user's call setup message that the user's call service type corresponds to allowing inter-system handover; or,

上述情况的组合，则所述MSC认为该切换类型为允许系统间切换。其中，所述用户的呼叫业务类型分为：语音呼叫，视频呼叫，低速的数据业务，高速的数据业务等类型。所述用户的呼叫业务类型与切换类型的对应关系可根据实际需要设置，例如，数据业务不允许切换，语音业务则允许切换。combination of the above situations, the MSC considers the handover type to allow inter-system handover. Wherein, the call service types of the user are divided into: voice call, video call, low-speed data service, high-speed data service and other types. The corresponding relationship between the user's call service type and the switching type can be set according to actual needs, for example, switching is not allowed for data services, but switching is allowed for voice services.

步骤106：所述MSC将所选择的业务切换信元随同空口承载指配请求消息(Assignment_Request)一起发送至所述BSC，指示所述BSC建立空口承载。Step 106: The MSC sends the selected service switching information element together with an air interface bearer assignment request message (Assignment_Request) to the BSC, instructing the BSC to establish an air interface bearer.

步骤107：所述BSC在收到所述空口承载指配请求消息后，建立空口承载，并且在完成后，向所述MSC返回空口承载建立完成消息(Assignment_Complete)。Step 107: The BSC establishes an air interface bearer after receiving the air interface bearer assignment request message, and returns an air interface bearer establishment completion message (Assignment_Complete) to the MSC after completion.

步骤108：所述BSC向所述MSC发送切换要求消息(Handover_Required)，要求发起系统间的切换。Step 108: the BSC sends a handover request message (Handover_Required) to the MSC, requesting to initiate an inter-system handover.

步骤109：所述MSC在收到所述BSC的切换要求消息后，向3G系统中的RNC发送切换请求消息(Relocation_Request)，请求所述RNC准备切换目标侧的资源。Step 109: After receiving the handover request message from the BSC, the MSC sends a handover request message (Relocation_Request) to the RNC in the 3G system, requesting the RNC to prepare resources on the handover target side.

步骤110：目标侧的RNC在收到所述切换请求消息后，向所述MSC返回一个切换请求证实消息(Relocation_Request_Acknowledge)后，进行后续的切换及呼叫连接等常规步骤。Step 110: After receiving the handover request message, the RNC at the target side returns a handover request acknowledgment message (Relocation_Request_Acknowledge) to the MSC, and performs subsequent routine steps such as handover and call connection.

需要说明的是，上述实施例步骤105中，对根据不同的用户信息是否发起系统间切换的判断方法可按照用户的实际情况设置。同时，所述用户信息也不限于上述列举的如用户业务类型等类型。上述步骤105中，所述MSC在收到所述呼叫建立消息后，还可按照以下步骤获知所述呼叫方的切换类型：It should be noted that, in step 105 of the above embodiment, the method for judging whether to initiate inter-system switching based on different user information may be set according to the actual situation of the user. At the same time, the user information is not limited to the types listed above such as user service types. In the above step 105, after the MSC receives the call setup message, it can also learn the switching type of the calling party according to the following steps:

如果所述MSC从所述主叫用户的签约信息中获知，该用户的ARD签约信息为只允许驻留在当前系统，或者获知该用户的优先级低时，或者，If the MSC learns from the calling user's subscription information that the user's ARD subscription information is only allowed to camp in the current system, or when it learns that the user's priority is low, or,

如果所述MSC获知该用户为双模终端时，或者，If the MSC learns that the user is a dual-mode terminal, or,

如果所述MSC从所述用户数据中获知该用户的漫游类型对应的是允许系统间切换时，或者，If the MSC learns from the user data that the roaming type of the user corresponds to allowing inter-system handover, or,

上述情况中的任一组合，any combination of the above,

则所述MSC认为该呼叫方的切换类型为允许系统间切换。其中，所述漫游类型、优先级与切换类型的对应关系都可根据实际需要预先设置，例如，国内漫游不允许切换，国际漫游则允许切换；还可设置优先级高的先切换等。Then the MSC considers that the calling party's handover type is to allow inter-system handover. Wherein, the roaming type, the corresponding relationship between the priority and the handover type can be preset according to actual needs, for example, domestic roaming is not allowed to be handed over, while international roaming is allowed to be handed over; high priority can also be set to be handed over first.

此外，本发明实施例不仅能够只针对某个用户信息来判定系统间的切换，还可将上述各种用户信息对应切换的判定方法任意组合来最终判定是否发起系统间的切换。只要是能够达到优化网络资源的目的，任何可判定系统间切换的用户信息以及不同用户信息的判定方法的任何组合都落入本发明的保护范围中。In addition, the embodiment of the present invention can not only determine the handover between systems only for a certain user information, but also combine the above-mentioned determination methods corresponding to various user information to finally determine whether to initiate the handover between systems. As long as the purpose of optimizing network resources can be achieved, any combination of user information that can determine handover between systems and methods for determining different user information falls within the protection scope of the present invention.

同时，本发明上述实施例一是对系统间切换的控制方法的具体描述，在所述步骤105中，当所述MSC从所述主叫用户发来的业务请求消息，以及呼叫建立消息中获知，该用户不允许切换，则所述MSC在后续步骤中向所述BSC下发的指配消息中携带的业务切换信元的值为不允许切换，则此时，所述主叫侧的BSC不向网络发送Handover_Required消息，而是和被叫的原接入侧直接建立正常的呼叫连接。At the same time, the first embodiment of the present invention is a specific description of the inter-system handover control method. In the step 105, when the MSC learns from the service request message and the call setup message sent by the calling user , the user is not allowed to switch, then the value of the service switching information element carried in the assignment message sent by the MSC to the BSC in the subsequent steps is not allowed to switch, then at this time, the BSC on the calling side The Handover_Required message is not sent to the network, but a normal call connection is directly established with the called original access side.

上述实施例中核心网能够根据用户接入区域，用户优先级，用户漫游类型，用户IMSI类型，用户ARD签约信息，用户发起的业务类型(比如语音呼叫，视频呼叫，低速的数据业务，高速的数据业务等)分别或者相互组合判断该呼叫方发起的业务请求是否为系统间切换，使核心网能够灵活控制从2G系统到3G系统的切换，实现小区负载的均衡，进而更合理地利用网络。In the above embodiments, the core network can base on user access area, user priority, user roaming type, user IMSI type, user ARD subscription information, user initiated service type (such as voice call, video call, low-speed data service, high-speed Data service, etc.) respectively or in combination with each other to judge whether the service request initiated by the caller is an inter-system handover, so that the core network can flexibly control the handover from the 2G system to the 3G system, realize cell load balancing, and then use the network more reasonably.

如图2所示，其为本发明核心网控制系统切换的另一个方法实施例的流程示意图，该方法为用户从3G系统始发呼叫，核心网根据该用户发起的业务请求消息，以及呼叫建立消息中的用户信息，将呼叫切换到2G系统中，本实施例中所述核心网可以为MSC，设3G系统中的RNC作为呼叫方，2G系统中的BSC作为切换方，该方法包括以下步骤：As shown in Figure 2, it is a schematic flow chart of another method embodiment of the core network control system switching of the present invention, the method is that the user initiates a call from the 3G system, and the core network initiates a service request message according to the user, and call establishment The user information in the message is to switch the call to the 2G system. In this embodiment, the core network can be an MSC, the RNC in the 3G system is set as the calling party, and the BSC in the 2G system is used as the switching party. The method includes the following steps :

步骤201：3G系统中的用户发起呼叫，RNC向MSC发送业务请求消息(Service_Request)。所述业务请求消息中至少包括用户的接入区域、及用户的国际移动用户标识码(IMSI)等信息。Step 201: A user in the 3G system initiates a call, and the RNC sends a service request message (Service_Request) to the MSC. The service request message at least includes information such as the user's access area and the user's International Mobile Subscriber Identity (IMSI).

步骤202：所述MSC在收到所述业务请求消息后，向所述RNC返回一个业务接受消息(Service_Accept)，通知用户可以发起呼叫。Step 202: After receiving the service request message, the MSC returns a service acceptance message (Service_Accept) to the RNC, notifying the user that a call can be initiated.

步骤203：所述RNC在收到该业务接受消息后，向所述MSC发送呼叫建立消息(SETUP)，该消息中至少包括用户的呼叫业务类型。其中，所述呼叫业务类型可分为语音或数据等类型。Step 203: After receiving the service acceptance message, the RNC sends a call setup message (SETUP) to the MSC, and the message at least includes the call service type of the user. Wherein, the call service type can be divided into types such as voice or data.

步骤204：所述MSC在收到所述用户的呼叫建立消息后，向所述RNC返回一个呼叫正在进行消息(Call_Proceeding)，指示用户呼叫正在接续过程中。Step 204: After receiving the call establishment message from the user, the MSC returns a call in progress message (Call_Proceeding) to the RNC, indicating that the call of the user is being connected.

步骤205：所述MSC从所述业务请求消息和/或呼叫建立消息中获取用户信息，根据预置的该用户信息与切换类型的对应关系判断是否允许系统间切换，当与所述用户信息对应的切换类型为允许系统间切换时，则选定业务切换信元的值为允许切换，并且所述MSC在为主叫用户分配完地面资源后，执行步骤206。其中，所述业务切换信元的值还可包括：可以切换但尽量不切换和不允许切换两种。Step 205: The MSC acquires user information from the service request message and/or call setup message, and judges whether inter-system handover is allowed according to the preset correspondence between the user information and the handover type, and when the corresponding user information corresponds to When the handover type of is to allow inter-system handover, the value of the selected service handover cell is to allow handover, and the MSC executes step 206 after allocating ground resources for the calling user. Wherein, the value of the service switching information element may also include: switching is possible but switching is not possible and switching is not allowed.

如果，所述MSC从所述主叫用户的呼叫建立消息中获知，该用户的呼叫业务类型对应的是允许切换；或者，If, the MSC learns from the calling user's call setup message that the user's call service type corresponds to allowing switching; or,

步骤206：所述MSC将选择的业务切换信元随空口承载指配请求消息(Assignment_Request)一起发送至所述，指示所述建立空口承载。Step 206: The MSC sends the selected service switching information element together with an air interface bearer assignment request message (Assignment_Request) to the MSC, instructing the establishment of the air interface bearer.

步骤207：所述RNC在收到所述空口承载指配请求消息后，建立空口承载，并且在完成后，向所述MSC返回空口承载建立完成消息(Assignment_Response)。Step 207: The RNC establishes an air interface bearer after receiving the air interface bearer assignment request message, and returns an air interface bearer establishment completion message (Assignment_Response) to the MSC after completion.

步骤208：所述RNC向所述MSC发送切换要求消息(Relocation_Required)，要求MSC发起系统间的切换。Step 208: the RNC sends a handover request message (Relocation_Required) to the MSC, requesting the MSC to initiate an inter-system handover.

步骤209：所述MSC在收到所述RNC的切换要求消息后，向2G系统中的BSC发送切换请求消息(Handover_Request)，请求所述BSC准备切换目标侧的资源。Step 209: After receiving the handover request message from the RNC, the MSC sends a handover request message (Handover_Request) to the BSC in the 2G system, requesting the BSC to prepare resources on the handover target side.

步骤210：目标侧的BSC在收到所述切换请求消息后，向所述MSC返回切换请求证实消息(Handover_Request_Acknowledge)后，执行后续的切换及呼叫连接等常规步骤。Step 210: After receiving the handover request message, the BSC at the target side returns a handover request acknowledgment message (Handover_Request_Acknowledge) to the MSC, and then performs subsequent routine steps such as handover and call connection.

上述实施例中核心网能够根据用户IMSI类型，用户发起的业务类型(比如语音呼叫，视频呼叫，低速的数据业务，高速的数据业务等)分别或者相互组合判断该呼叫方发起的业务请求是否为系统间切换，使核心网能够灵活控制从3G系统到2G系统的切换，实现小区负载的均衡，进而更合理地利用网络。In the above-mentioned embodiment, the core network can judge whether the service request initiated by the caller is The inter-system handover enables the core network to flexibly control the handover from the 3G system to the 2G system, realizes cell load balance, and then utilizes the network more rationally.

需要说明的是，上述实施例的步骤205中，对是否发起切换的判断原则可按照用户的需求自行设置。同时，所述用户信息也不限于上述列举的如用户业务类型等类型。上述步骤105中，在所述MSC在收到所述呼叫建立消息后，还可按照以下步骤获知所述呼叫方的切换类型：It should be noted that, in step 205 of the above embodiment, the principle of judging whether to initiate a handover can be set according to the needs of the user. At the same time, the user information is not limited to the types listed above such as user service types. In the above step 105, after the MSC receives the call setup message, it can also learn the switching type of the calling party according to the following steps:

上述情况中的任一组合，则所述MSC认为该呼叫方的切换类型为允许系统间切换。其中，所述漫游类型、优先级与切换类型的对应关系都可根据实际需要预先设置，例如，国内漫游不允许切换，国际漫游则允许切换；还可设置优先级高的先切换等。Any combination of the above situations, the MSC considers that the caller's handover type is to allow inter-system handover. Wherein, the roaming type, the corresponding relationship between the priority and the handover type can be preset according to actual needs, for example, domestic roaming is not allowed to be handed over, while international roaming is allowed to be handed over; high priority can also be set to be handed over first.

同时，本发明上述图2所示实施例是对从3G系统切换到2G系统的切换控制方法的具体描述，在所述步骤205中，当所述MSC从所述主叫用户发来的业务请求消息，以及呼叫建立消息中获知，该用户不允许系统间切换，则所述MSC在后续步骤中向所述RNC下发的指配消息中携带的业务切换信元的值为不允许切换，则此时，所述主叫侧的RNC不再向网络发送Handover_Required消息，而是和被叫的原接入侧直接建立正常的呼叫连接。At the same time, the above-mentioned embodiment of the present invention shown in FIG. 2 is a specific description of the handover control method from the 3G system to the 2G system. In the step 205, when the service request sent by the MSC from the calling user message, and the call setup message that the user does not allow inter-system handover, then the value of the service handover information element carried in the assignment message sent by the MSC to the RNC in the subsequent steps is that handover is not allowed, then At this time, the RNC on the calling side no longer sends the Handover_Required message to the network, but directly establishes a normal call connection with the called original access side.

上述实施例中核心网能够根据用户的接入区域，用户优先级，用户漫游类型，用户SIM卡类型，用户ARD签约信息，用户的品牌，用户发起的业务(比如语音呼叫，视频呼叫，低速的数据业务，高速的数据业务等)等切换条件进行业务切换信元的配置，使核心网能够灵活控制系统间切换，实现小区负载的均衡，进而更好地合理利用网络。In the above embodiments, the core network can base on the user's access area, user priority, user roaming type, user SIM card type, user ARD subscription information, user brand, and services initiated by the user (such as voice calls, video calls, low-speed Data service, high-speed data service, etc.) and other switching conditions to configure service switching cells, so that the core network can flexibly control inter-system switching, achieve cell load balance, and make better use of the network.

此外，上述图1和图2所示的两个实施例中，当切换类型为允许系统间切换时，所述业务切换信元的值不仅包括允许切换，还可以根据网络的具体情况，由所述核心网通过操作管理(O&M)将该用户配置业务切换信元的值设为：允许切换、或允许切换但尽量不切换两种类型。所述核心网可根据业务请求的重要性，设置不同切换类型值的业务切换信元。在呼叫过程中，系统可根据所述业务切换信元值的不同类型，有选择的切换，由于为现有技术，因此不再赘述。In addition, in the above two embodiments shown in Fig. 1 and Fig. 2, when the handover type is to allow inter-system handover, the value of the service handover information element not only includes the allowable handover, but also can be determined according to the specific conditions of the network. The above-mentioned core network sets the value of the service switching information element configured by the user through the operation management (O&M): to allow switching, or to allow switching but try not to switch to two types. The core network can set service switching information elements with different switching type values according to the importance of the service request. During the call process, the system can selectively switch according to the different types of service switching cell values. Since it is a prior art, it will not be repeated here.

此外，在上述图1所示实施例的步骤105和图2所示实施例的步骤205中，所述核心网在获取所述呼叫方的用户信息前，还可以先判断所述RNC或BSC是否支持业务切换信元，当支持时，则所述核心网再执行后续的所述获取所述呼叫方的用户信息步骤，否则不发起系统间的切换。In addition, in step 105 of the above-mentioned embodiment shown in FIG. 1 and step 205 of the embodiment shown in FIG. 2, the core network may first determine whether the RNC or BSC The service switching information element is supported, and when it is supported, the core network performs the subsequent step of obtaining the user information of the calling party, otherwise, the inter-system switching is not initiated.

其中，所述核心网判断所述RNC或BSC是否支持业务切换信元的方法具体为：Wherein, the method for the core network to judge whether the RNC or the BSC supports service switching cells is specifically:

如果所述MSC通过所述O&M配置得知，当不在IU-CS接口启动基于业务的切换，则所述MSC设置所述业务切换信元的值为不允许切换；If the MSC learns through the O&M configuration that when the service-based handover is not started on the IU-CS interface, the MSC sets the value of the service handover information element to not allow handover;

如果MSC通过O&M配置得知，当不在A接口启动基于业务的切换，则所述MSC设置所述业务切换信元的值为不允许切换。If the MSC learns through the O&M configuration that the service-based handover is not started on the A interface, the MSC sets the value of the service handover information element to not allow handover.

上述几个实施例给出的都是局内系统间切换的方法，本发明还适用于局间系统间的切换，局间系统切换的控制方法与上述实施例中系统间切换的控制方法大致相同，不同之处在于，在本实施例中，当核心网获知允许系统间切换时，所述核心网将附带有业务切换信元的切换请求消息发送给切换的目标局的核心网，而不是给本局内的切换的目标基站BSC。如图3所示，其为本发明局间系统间切换的一个方法实施例的流程图，该方法以局间从3G系统切换到2G系统为例，设核心网为MSC-A，切换的目标局的核心网为2G系统中的MSC-B，该方法步骤301～步骤307与上述图2所示的实施例中步骤201至步骤207实质相同，在本实施例中由所述MSC-A完成上述步骤，之后本实施例还包括以下步骤：The above-mentioned several embodiments all provide the method for inter-system handover in the office. The present invention is also applicable to inter-office system handover. The control method for inter-office system handover is roughly the same as the control method for inter-system handover in the above-mentioned embodiments. The difference is that in this embodiment, when the core network learns that inter-system handover is allowed, the core network sends a handover request message with a service handover cell to the core network of the handover target office instead of the The target base station BSC for intra-office handover. As shown in Figure 3, it is a flow chart of a method embodiment of inter-office inter-system handover of the present invention. The method takes the inter-office handover from 3G system to 2G system as an example, assumes that the core network is MSC-A, and the target of the handover is The core network of the office is the MSC-B in the 2G system, and the method steps 301 to 307 are substantially the same as the steps 201 to 207 in the embodiment shown in Figure 2 above, and are completed by the MSC-A in this embodiment After the above steps, this embodiment also includes the following steps:

步骤308：3G系统中的RNS-A向所述MSC-A发送Iu口的切换要求消息(Iu_Relocation_Required)，要求MSC发起系统间的切换。其中，所述Iu口的切换要求消息还可以称为Iu口的重配置请求消息。Step 308: RNS-A in the 3G system sends an Iu handover request message (Iu_Relocation_Required) to the MSC-A, requesting the MSC to initiate inter-system handover. Wherein, the switching request message of the Iu interface may also be referred to as a reconfiguration request message of the Iu interface.

步骤309：所述MSC-A产生切换到2G系统的A接口的切换请求消息(A_HO_REQUEST)，然后再根据所述Iu_Relocation_Required消息中指定的目标小区来决定是否发起局间切换，当所指定的目标小区为其他局小区时，则所述MSC-A按照步骤310向所述目标小区所在的指定局发起系统间切换。其中，根据目标小区来决定是否要发起局间切换的判断方法为现有技术，因此不再赘述。Step 309: The MSC-A generates a handover request message (A_HO_REQUEST) for switching to the A interface of the 2G system, and then decides whether to initiate an interoffice handover according to the target cell specified in the Iu_Relocation_Required message, when the specified target cell is If other office cells are used, the MSC-A initiates an intersystem handover to the designated office where the target cell is located according tostep 310 . Wherein, the judging method of deciding whether to initiate the inter-office handover according to the target cell is the prior art, so it will not be repeated here.

步骤310：所述MSC-A在E接口上将所述A_HO_REQUEST消息打包在MAP接口的切换请求消息(MAP_Prep_Handover_Request)中，并将所述MAP_Prep_Handover_Request消息发送至指定局的MSC-B，请求所述MSC-B准备切换目标侧的资源。其中，所述A_HO_REQUEST消息和所述MAP_Prep_Handover_Request消息中都携带有业务切换信元，该信元的值与所述MSC-A向所述主叫侧RNC发送指配消息时，携带的业务切换信元的值相同。Step 310: The MSC-A packs the A_HO_REQUEST message in the handover request message (MAP_Prep_Handover_Request) of the MAP interface on the E interface, and sends the MAP_Prep_Handover_Request message to the MSC-B of the designated office, requesting the MSC- B prepares to switch resources on the target side. Wherein, both the A_HO_REQUEST message and the MAP_Prep_Handover_Request message carry a service switching information element, the value of which is the same as the service switching information element carried when the MSC-A sends an assignment message to the calling side RNC the same value.

步骤311：所述MSC-B在收到所述MAP_Prep_Handover_Request消息后，向VLR-B(Visitor Location Register，拜访位置寄存器)发送MAP_Allocate_Handover_Number req.消息，其目的是申请切换号码，以便建立所述MSC-A到所述MSC-B之间的话路，即为IAM(初始地址消息)做准备。Step 311: After receiving the MAP_Prep_Handover_Request message, the MSC-B sends a MAP_Allocate_Handover_Number req. message to the VLR-B (Visitor Location Register), the purpose of which is to apply for switching numbers, so as to establish the MSC-A The channel to the MSC-B is to prepare for IAM (Initial Address Message).

步骤312：所述MSC-B从所述MAP_Prep_Handover_Request消息中解析出所述A_HO_REQUEST消息，并将所述A_HO_REQUEST消息发送给所述切换的目标基站BSS-B，请求所述BSS-B准备切换目标侧的无线资源。Step 312: The MSC-B parses the A_HO_REQUEST message from the MAP_Prep_Handover_Request message, and sends the A_HO_REQUEST message to the handover target base station BSS-B, requesting the BSS-B to prepare the handover target side wireless resources.

步骤313：所述目标侧的BSS-B当完成了无线资源准备后，向所述MSC-B返回切换请求证实消息(A_HO_REQUEST_ACK)后，执行步骤314及后续的局间从3G到2G的切换及呼叫连接等步骤。Step 313: After the BSS-B on the target side completes the radio resource preparation, it returns a handover request confirmation message (A_HO_REQUEST_ACK) to the MSC-B, and then performsstep 314 and subsequent interoffice handover from 3G to 2G and Steps such as call connection.

步骤314：所述VLR-B在收到所述MSC-B的MAP_Allocate_Handover_Number req.消息后，向所述MSC-B返回MAP_Send_Handover_Number Report req.消息，该消息中包含有所述VLR-B分配的切换号码。Step 314: After receiving the MAP_Allocate_Handover_Number req. message of the MSC-B, the VLR-B returns a MAP_Send_Handover_Number Report req. message to the MSC-B, which contains the handover number allocated by the VLR-B .

步骤315：所述MSC-B从所述MAP_Send_Handover_Number Report req.消息中解析出所述切换号码，将所述切换号码和所述A_HO_REQUEST_ACK消息一起构造成MAP_Prep_Handover resp.消息，并将该消息发送至3G系统中的所述MSC-A。此时，所述MSC-B已准备好了无线资源与切换号码。Step 315: The MSC-B parses the handover number from the MAP_Send_Handover_Number Report req. message, constructs the MAP_Prep_Handover resp. message together with the handover number and the A_HO_REQUEST_ACK message, and sends the message to the 3G system The MSC-A in. At this point, the MSC-B has prepared radio resources and handover numbers.

步骤316：所述MSC-A从所述MAP_Prep_Handover resp.消息中解析出切换号码，向所述MSC-B发送初始地址消息(IAM)，建立与所述MSC-B之间的话路。Step 316: The MSC-A parses the handover number from the MAP_Prep_Handover resp. message, sends an initial address message (IAM) to the MSC-B, and establishes a voice path with the MSC-B.

步骤317：所述MSC-B向所述VLR-B发送切换号码释放消息(MAP-Send-Handover-Number Report resp.)，要求所述VLR-B将为所述MSC-B分配的切换号码释放，以留给其他用户切换使用。Step 317: The MSC-B sends a handover number release message (MAP-Send-Handover-Number Report resp.) to the VLR-B, requiring the VLR-B to release the handover number assigned by the MSC-B , leaving it for other users to switch.

步骤318：所述MSC-B向所述MSC-A返回地址完全消息(ACM)，表明与所述MSC-A之间的话路完全建立。Step 318: The MSC-B returns an Address Complete Message (ACM) to the MSC-A, indicating that the session with the MSC-A is completely established.

步骤319：所述MSC-A向所述RNS-A发送切换命令(Iu_Relocation_Command)。Step 319: the MSC-A sends a handover command (Iu_Relocation_Command) to the RNS-A.

步骤320：当所述BSS-B检测到有手机接入2G系统时，向所述MSC-B发送切换检测消息(A_Handover_Detect)。Step 320: When the BSS-B detects that there is a mobile phone accessing the 2G system, it sends a handover detection message (A_Handover_Detect) to the MSC-B.

步骤321：所述BSS-B将所接收到的A_Handover_Detect消息通过接入处理消息(MAP_Process_Access_Signal Req.)发送给所述MSC-A，以告知所述MSC-A手机已从2G系统接入。Step 321: The BSS-B sends the received A_Handover_Detect message to the MSC-A through an access processing message (MAP_Process_Access_Signal Req.) to inform the MSC-A that the mobile phone has accessed from the 2G system.

步骤322：当所述BSS-B检测到所述手机已经成功接入到2G系统中时，向所述MSC-B发送切换完成消息(A_Handover_Complete)。Step 322: When the BSS-B detects that the mobile phone has successfully connected to the 2G system, send a handover completion message (A_Handover_Complete) to the MSC-B.

步骤323：所述BSS-B将所接收到的A_Handover_Complete消息通过发送结束消息(MAP_Send_End_Signal Req.)发送给所述MSC-A，以告知所述MSC-A手机已从2G系统成功接入。Step 323: The BSS-B sends the received A_Handover_Complete message to the MSC-A through a sending end message (MAP_Send_End_Signal Req.), to inform the MSC-A that the mobile phone has successfully accessed from the 2G system.

步骤324：所述MSC-A在收到所述MAP_Send_End_Signal Req.消息后，向所述RNS-A发送释放命令(Iu_Release_Command)，通知所述RNS-A释放原来通话占用的无线资源。Step 324: After receiving the MAP_Send_End_Signal Req. message, the MSC-A sends a release command (Iu_Release_Command) to the RNS-A, notifying the RNS-A to release the radio resource occupied by the original call.

步骤325：所述RNS-A在释放完原来通话占用的无线资源后，向所述MSC-A返回释放完成消息(Iu_Release_Complete)。Step 325: The RNS-A returns a release complete message (Iu_Release_Complete) to the MSC-A after releasing the radio resource occupied by the original call.

步骤326：所述MSC-B在中继接口上发送应答消息(ANM)给所述MSC-A，通知切换完成，以和所述ACM消息保持中继信令的完整。Step 326: The MSC-B sends an Answer Message (ANM) to the MSC-A on the trunk interface to notify the completion of the handover, so as to keep the integrity of the trunk signaling with the ACM message.

步骤327：当通话结束后，所述MSC-A向所述MSC-B发送话路释放消息(REL)，要求释放局间话路资源。Step 327: After the call ends, the MSC-A sends a session release message (REL) to the MSC-B, requesting to release the inter-office session resource.

步骤328：所述MSC-A向所述MSC-B发送结束信令响应(MAP_Send_End_Signal resp.)，要求所述MSC-B释放系统间切换时申请的无线资源。Step 328: The MSC-A sends an end signaling response (MAP_Send_End_Signal resp.) to the MSC-B, requesting the MSC-B to release the radio resources applied for during inter-system handover.

上述实施例中不仅核心网能够根据用户发起的业务类型等因素判断该呼叫方发起的业务请求是否为系统间切换，使核心网能够灵活控制从3G系统到2G系统的切换，实现小区负载的均衡。而且还通过核心网在向切换的目标局中的MSC-B发送切换请求消息时，将业务切换信元一起发送至所述MSC-B，从而实现局间的系统间切换。In the above embodiment, not only the core network can judge whether the service request initiated by the caller is an inter-system handover according to factors such as the service type initiated by the user, so that the core network can flexibly control the handover from the 3G system to the 2G system, and realize cell load balancing . Moreover, when the core network sends a handover request message to the MSC-B in the handover target office, the service handover information element is sent to the MSC-B together, so as to realize inter-office intersystem handover.

需要说明的是，上述实施例中当所述MSC-A通过O&M配置得知所述MSC-A不在局间传递业务切换信元时，则在所述步骤310中，所述MSC-A向所述MSC-B发送的所述MAP_Prep_Handover_Request消息中不携带业务切换信元，此时，则不发起局间的系统间切换。It should be noted that, in the above embodiment, when the MSC-A learns through the O&M configuration that the MSC-A does not transfer service switching cells between offices, then in thestep 310, the MSC-A sends the The MAP_Prep_Handover_Request message sent by the MSC-B does not carry a service handover information element, and at this time, no inter-office inter-system handover is initiated.

此外，上述实施例中当所述MSC-B通过O&M配置得知所述MSC-B不在A接口启动基于业务切换时，则在所述步骤312中，所述MSC-B向所述切换的目标基站BSS-B发送的所述A_HO_REQUEST消息中，不包含业务切换信元。此时，目标局不发起系统间的切换。In addition, in the above embodiment, when the MSC-B learns that the MSC-B does not start service-based handover on the A interface through the O&M configuration, then in thestep 312, the MSC-B sends the handover target The A_HO_REQUEST message sent by the base station BSS-B does not contain a service switching information element. At this time, the target office does not initiate handover between systems.

需要说明的是，上述实施例中所述呼叫方都是以主叫用户为例进行的详细说明，本发明实施例中所述核心网还可以根据被叫用户的用户信息，进而判断是否发起系统间的切换。和主叫用户不同的是，被叫用户的用户信息可从所述被叫用户发送给MSC的寻呼应答消息、呼叫证实消息(call_conform)、以及保存在所述MSC上的被叫用户的用户数据中获取。而具体的切换判断方法以及切换的流程方法因都与上述实施例中的雷同，再次不再赘述。It should be noted that the caller in the above embodiments is described in detail by taking the calling user as an example. The core network in the embodiment of the present invention can also judge whether to initiate a system call based on the user information of the called user. switch between. Different from the calling user, the user information of the called user can be sent from the called user to the paging response message of the MSC, the call confirmation message (call_conform), and the user information of the called user stored on the MSC. obtained from the data. The specific handover judging method and the handover flow method are the same as those in the above-mentioned embodiments, and will not be described again.

基于上述技术方案，本发明实施例还公开了一种核心网中能够控制系统间切换的网元，如图4所示，所述网元包括：接收单元401、切换类型存储单元402、用户信息获取单元403、切换类型判断单元404、业务切换信元生成单元405、发送单元406，其中，Based on the above technical solution, the embodiment of the present invention also discloses a network element in the core network capable of controlling switching between systems. As shown in FIG. 4 , the network element includes: a receivingunit 401, a switchingtype storage unit 402, a user information Theacquisition unit 403, the handovertype judgment unit 404, the service handovercell generation unit 405, and the sendingunit 406, wherein,

所述切换类型存储单元402，用于存储预置的用户信息与切换类型的对应关系；The switchingtype storage unit 402 is configured to store the correspondence between preset user information and switching types;

所述用户信息获取单元403，用于从由所述接收单元401接收到的呼叫建立相关的消息中获取呼叫方的用户信息，并将所述用户信息告知所述切换类型判断单元404；The userinformation acquiring unit 403 is configured to acquire the user information of the calling party from the message related to call setup received by the receivingunit 401, and notify the handovertype judging unit 404 of the user information;

所述切换类型判断单元404，用于收到所述用户信息后，根据所述切换类型存储单元402中该用户信息与切换类型的对应关系获知，当与所述用户信息对应的切换类型为允许系统间切换时，将允许切换的判断结果告知所述业务切换信元生成单元405；The switchingtype judging unit 404 is configured to obtain the user information according to the correspondence between the user information and the switching type in the switchingtype storage unit 402 after receiving the user information, when the switching type corresponding to the user information is allowed When switching between systems, notify the service switchingcell generating unit 405 of the judgment result of allowing the switching;

所述业务切换信元生成单元405，用于在收到所述允许切换的判断结果后，生成业务切换信元，并通过所述发送单元406将所述业务切换信元随同空口承载指配请求消息发送至所述呼叫方、及随同发送切换请求消息发送至所述切换的目标侧。The service switching informationelement generation unit 405 is configured to generate a service switching information element after receiving the judgment result of allowing switching, and send the service switching information element together with the air interface bearer assignment request through the sending unit 406 A message is sent to the calling party, along with a handover request message to the target side of the handover.

其中，当所述呼叫方为主叫用户时，所述呼叫建立相关的消息可具体为业务请求消息和/或呼叫建立消息，所述业务请求消息的用户信息至少包括：用户的接入区域、用户的国际移动用户标识码IMSI。所述呼叫建立消息的用户信息至少包括：用户的呼叫业务类型。Wherein, when the calling party is the calling user, the message related to the call establishment may specifically be a service request message and/or a call establishment message, and the user information of the service request message includes at least: the user's access area, The user's International Mobile Subscriber Identity IMSI. The user information of the call setup message at least includes: the call service type of the user.

其中，当所述呼叫方为被叫用户时，所述呼叫建立相关的消息可具体为寻呼相应消息和/或呼叫证实消息。Wherein, when the calling party is the called user, the message related to call establishment may specifically be a corresponding paging message and/or a call confirmation message.

其中，所述网元可以为移动交换中心MSC。Wherein, the network element may be a mobile switching center MSC.

此外，如图5所示，其为本发明核心网中能够控制系统间切换的另一个网元实施例的结构框图。该网络在上述网元实施例的基础上，还包括：In addition, as shown in FIG. 5 , it is a structural block diagram of another network element embodiment capable of controlling handover between systems in the core network of the present invention. On the basis of the foregoing network element embodiments, the network further includes:

用户类型获取单元507，用于根据从所述接收单元401接收到的呼叫建立相关的消息，从移动交换中心MSC上获取呼叫方的用户类型，并将所述用户类型告知所述切换类型判断单元404；其中，所述用户类型至少包括：呼叫方的签约信息、用户数据等信息。The usertype acquisition unit 507 is configured to obtain the user type of the calling party from the mobile switching center MSC according to the call setup-related message received from the receivingunit 401, and inform the handover type judgment unit of theuser type 404; Wherein, the user type includes at least: subscription information of the calling party, user data and other information.

所述切换类型存储单元402，还用于存储所述用户类型与切换类型的对应关系；The switchingtype storage unit 402 is also used to store the correspondence between the user type and switching type;

所述切换类型判断单元404，还用于收到所述用户类型后，根据所述切换类型存储单元402中该用户类型与切换类型的对应关系获知，当与所述用户信息对应的切换类型为允许系统间切换时，将允许切换的判断结果告知所述业务切换信元生成单元405；The switchingtype judging unit 404 is further configured to obtain the user type according to the correspondence between the user type and the switching type in the switchingtype storage unit 402 after receiving the user type, when the switching type corresponding to the user information is When inter-system switching is allowed, notify the service switchingcell generation unit 405 of the judgment result of allowing the switching;

上述实施例中所述切换类型判断单元404能够根据用户接入区域，用户优先级，用户漫游类型，用户IMSI类型，用户ARD签约信息，用户发起的业务类型(比如语音呼叫，视频呼叫，低速的数据业务，高速的数据业务等)判断该呼叫方发起的业务请求是否为系统间切换，使核心网能够灵活控制系统间的切换，实现小区负载的均衡，进而更合理地利用网络。The switchingtype judging unit 404 in the above-mentioned embodiment can be based on user access area, user priority, user roaming type, user IMSI type, user ARD subscription information, user initiated service type (such as voice call, video call, low-speed data service, high-speed data service, etc.) to judge whether the service request initiated by the caller is an inter-system handover, so that the core network can flexibly control the inter-system handover, realize cell load balance, and use the network more reasonably.

基于上述技术方案，本发明实施例还公开了一种能够控制系统间切换的系统，如图6所示，所述系统包括：核心网601、呼叫方602、切换的目标侧603、及位于所述核心网601中的能够控制系统间切换的网元604，其中，Based on the above technical solution, the embodiment of the present invention also discloses a system capable of controlling handover between systems. As shown in FIG. Thenetwork element 604 in thecore network 601 that can control inter-system handover, wherein,

所述呼叫方602向所述核心网601发起呼叫，所述核心网601中的所述控制系统间切换的网元604，用于从所述呼叫方602发来的呼叫建立相关的消息中获取该呼叫方的用户信息，并根据所述用户信息判断该呼叫方602发起的业务请求是否允许系统间切换，当允许系统间切换时，则所述网元604将业务切换信元随同空口承载指配请求消息发送至所述呼叫方602、及将业务切换信元随同切换请求消息发送至所述切换的目标侧603。Thecaller 602 initiates a call to thecore network 601, and thenetwork element 604 in thecore network 601 that controls inter-system handover is configured to obtain from a call establishment-related message sent by thecaller 602 The user information of the calling party, and judge whether the service request initiated by the callingparty 602 allows inter-system handover according to the user information. Send a provisioning request message to the callingparty 602, and send a service switching cell along with the switching request message to the switchingtarget side 603.

其中，所述网元604包括：接收单元401、切换类型存储单元402、用户信息获取单元403、切换类型判断单元404、业务切换信元生成单元405、发送单元406，其中，Wherein, thenetwork element 604 includes: a receivingunit 401, a switchingtype storage unit 402, a userinformation acquiring unit 403, a switchingtype judging unit 404, a service switchingcell generating unit 405, and a sendingunit 406, wherein,

其中，所述能够控制系统间切换的网元604可以为移动交换中心MSC。Wherein, thenetwork element 604 capable of controlling inter-system handover may be a mobile switching center MSC.

以上所述的本发明实施方式，并不构成对本发明保护范围的限定。任何在本发明的精神和原则之内所作的修改、等同替换和改进等，均应包含在本发明的保护范围之内。The embodiments of the present invention described above are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.