CN1756430A - A Method to Solve Repeated Switching of Terminals - Google Patents

Abstract

The invention discloses a method by setting timer on local network side to solve terminal repeating switch, which comprises: A. terminal sends switch requirement to local network; B. network side starts timer for timing, and decides whether there is another switch requirement when timing ends; if yes, turns to step C; or else, continues the calling without switch; C. network side switches the terminal to continue calling on switched zone. This invention can avoid frequent switch when calling signal drifts or encounters conflict from other signal, and decreases local network resource.

Description

Translated fromChinese

一种解决终端反复切换的方法A Method to Solve Repeated Switching of Terminals

技术领域technical field

本发明涉及在无线本地网中终端切换技术，特别涉及一种解决终端反复切换的方法。The invention relates to terminal switching technology in wireless local network, in particular to a method for solving terminal repeated switching.

背景技术Background technique

目前有很多无线本地网运营商，其有运营无线本地网的权利，但不能运营移动网，在管制比较严格的地方，要求终端的漫游区域不能超过该无线本地网运营商所管辖的小区、单基站范围或者多基站范围，超出范围不能给终端提供呼叫业务服务。这种情况称之为终端的漫游限制。At present, there are many wireless local network operators, which have the right to operate wireless local networks, but cannot operate mobile networks. In places with relatively strict regulations, the roaming area of terminals is required not to exceed the area under the jurisdiction of the wireless local network operator. The range of the base station or the range of multiple base stations, beyond the range, the call service cannot be provided to the terminal. This situation is called roaming restriction of the terminal.

现在存在很多方法实现基于小区、单基站或多基站的终端的漫游限制判断。Currently, there are many methods to realize roaming restriction judgment of a terminal based on a cell, a single base station or multiple base stations.

图1为现有技术其中一种实现对终端漫游限制判断的过程流程图，预先将存储在归属位置寄存器(HLR)的签约终端的漫游限制区域列表下发给管辖该终端的移动交换中中心(MSC)，并存储在该MSC的访问位置寄存器(VLR)中，其具体步骤为：Fig. 1 is one of the flow charts of the process of realizing the roaming restriction judgment of the terminal in the prior art, and the roaming restricted area list of the contracted terminal stored in the home location register (HLR) is sent to the mobile switching center (MSC) which governs the terminal in advance. MSC), and stored in the visitor location register (VLR) of the MSC, the specific steps are:

步骤100、在终端发起呼叫、或者被呼叫、或者发生切换时，管辖终端当前所在区域的基站控制器(BSC)向该终端所属的MSC上报当前要给用户提供呼叫服务的区域列表；Step 100, when the terminal initiates a call, or is called, or when a handover occurs, the base station controller (BSC) in charge of the area where the terminal is currently located reports to the MSC to which the terminal belongs a list of areas currently providing call services to the user;

步骤101、接收到该区域列表的MSC判断当前要给用户提供呼叫服务的区域列表是否在预先在VLR的存储的该终端的漫游限制区域列表之中，如果是，执行步骤102；否则，执行步骤103；Step 101, the MSC that has received the area list judges whether the area list that will provide call service to the user is in the roaming restricted area list of the terminal stored in VLR in advance, if yes, execute step 102; otherwise, execute step 102; 103;

步骤102、MSC对该终端要进行的业务进行处理，使该终端实现要进行的业务，如：该终端发起呼叫或者被叫时，则建立呼叫连接，实现呼叫或被呼叫，该终端要切换时，则进行切换；Step 102, MSC processes the service to be performed by the terminal, so that the terminal realizes the service to be performed, such as: when the terminal initiates a call or is called, then establishes a call connection to realize calling or being called, and when the terminal is to be switched , then switch;

步骤103、MSC通过管辖终端当前所在区域的BSC向该终端发送进行漫游限制的消息，拒绝该终端所发起的业务。In step 103, the MSC sends a roaming restriction message to the terminal through the BSC in charge of the area where the terminal is currently located, and rejects the service initiated by the terminal.

按照图1的过程就可以对终端的漫游限制进行判断了。但是终端在移动过程中的环境变化是非常快的，尤其是终端在处于两个基站的重叠区，如处在基站A和基站B时，很可能当前终端在基站A的覆盖区域，随着信号偶然漂移到基站B或者受到基站B呼叫信号的抵触，导致终端要由基站A切换到基站B，然后随着基站A呼叫信号的恢复又切换回基站A，这样的反复切换都必须伴随着终端的漫游限制判断，使对终端的漫游限制判断过程在短时间内分别在基站A和基站B覆盖的区域执行多次，这是十分困难的并且执行多次对终端的漫游限制判断浪费了无线本地网的资源。The roaming restriction of the terminal can be judged according to the process in FIG. 1 . However, the environment of the terminal changes very quickly during the mobile process, especially when the terminal is in the overlapping area of two base stations, such as base station A and base station B, it is very likely that the current terminal is in the coverage area of base station A, with the signal Occasionally drifting to base station B or being interfered by the call signal of base station B, the terminal will switch from base station A to base station B, and then switch back to base station A as the call signal of base station A recovers. Such repeated switching must be accompanied by the terminal Roaming restriction judgment, so that the roaming restriction judgment process of the terminal is executed multiple times in the area covered by base station A and base station B respectively in a short period of time, which is very difficult and performing multiple roaming restriction judgments on the terminal wastes the wireless local network H.

从上述分析可以看出，当终端处于多个基站覆盖的重叠区时会频繁发生切换，从而频繁进行漫游限制判断，从而使对终端的漫游限制判断十分困难并且浪费了无线本地网的资源。更进一步的，由于现有技术无法区分出当终端处于多个基站覆盖的重叠区时是由于移动还是信号漂移或者受到其他基站呼叫信号的抵触时而造成的切换，可能会出现这样的情况：当终端的呼叫信号由签约区域漂移到非签约区域，但在很短的时间内又切换回签约区域，此时当终端切换到非签约区域时由于切换伴随漫游限制判断会导致呼叫拆线。From the above analysis, it can be seen that when the terminal is in the overlapping area covered by multiple base stations, handovers will occur frequently, so roaming restriction judgments are frequently made, which makes it very difficult to judge the roaming restriction of the terminal and wastes the resources of the wireless local network. Furthermore, because the existing technology cannot distinguish whether the terminal is in the overlapping area covered by multiple base stations due to movement or signal drift or the handover caused by interference from other base station call signals, such a situation may occur: when the terminal The call signal drifts from the contracted area to the non-contracted area, but switches back to the contracted area within a short period of time. At this time, when the terminal switches to the non-contracted area, the call will be disconnected due to the judgment of the switching and roaming restrictions.

发明内容Contents of the invention

有鉴于此，本发明的主要目的在于一方面提供一种解决终端反复切换的方法，该方法能够实现当呼叫信号漂移或者受到其他基站呼叫信号的抵触时终端不进行频繁切换，从而使伴随切换的对终端的漫游限制判断次数减少，节约无线本地网的资源。更进一步的，实现当呼叫信号从签约区域漂移到非签约区域时，解决由于切换伴随漫游限制判断会导致的呼叫拆线。In view of this, the main purpose of the present invention is to provide a method for solving repeated handover of terminals on the one hand, which can realize that the terminal does not perform frequent handover when the call signal drifts or is conflicted by call signals of other base stations, so that the handover accompanying handover The number of judgments on the roaming restriction of the terminal is reduced, saving the resources of the wireless local network. Furthermore, when the call signal drifts from the contracted area to the non-contracted area, it can solve the call disconnection caused by the roaming restriction judgment caused by handover.

根据上述目的，本发明的技术方案是这样实现的：According to above-mentioned purpose, technical scheme of the present invention is achieved like this:

一种解决终端反复切换的方法，在无线本地网网络侧设置定时器，该方法还包括：A method for solving terminal repeated switching, setting a timer on the wireless local network network side, the method also includes:

A、终端向本地网的网络侧发起切换请求；A. The terminal initiates a handover request to the network side of the local network;

B、本地网的网络侧启动定时器定时，判断在定时器到时时是否收到该终端发起的再次切换请求，如果是，转入步骤C；否则，本地网的网络侧对该终端不进行切换，终端的呼叫继续进行；B. The network side of the local network starts the timer timing, and judges whether the re-switching request initiated by the terminal is received when the timer expires, and if so, proceeds to step C; otherwise, the network side of the local network does not switch the terminal , the terminal call continues;

C、本地网的网络侧按照再次切换请求切换该终端，该终端到要切换的区域后继续呼叫。C. The network side of the local network switches the terminal according to the switching request again, and continues calling after the terminal reaches the area to be switched.

所述的定时器设置在无线本地网网络侧的移动交换中心上。The timer is set on the mobile switching center on the network side of the wireless local network.

步骤B所述定时器定时的时间根据当前本地无线网的配置情况、呼叫信号漂移和受到非当前所在区域的基站呼叫信号的抵触的时限进行预先设置。The timing of the timer in step B is preset according to the configuration of the current local wireless network, the drift of the call signal, and the time limit for the interference of the call signal of the base station not in the current area.

步骤A所述的切换请求携带有终端当前激活所有小区的区域信息；The handover request described in step A carries area information of all cells currently activated by the terminal;

在步骤B之前，该方法还包括：接收到该请求的无线本地网网络侧判断该请求携带的区域信息是否包含在预先存储的该终端的漫游限制区域列表之中，如果是，将该终端切换到其请求的一个小区内，该终端到要切换的区域后继续呼叫；否则，执行步骤B。Before step B, the method further includes: the wireless local network network side receiving the request judges whether the area information carried in the request is included in the pre-stored roaming restricted area list of the terminal, and if so, switches the terminal In a cell requested by the terminal, the terminal continues to call after entering the area to be handed over; otherwise, execute step B.

步骤B所述的再次切换请求携带有终端再次激活所有小区的区域信息；The re-handover request described in step B carries area information of all cells reactivated by the terminal;

在步骤C之前，该方法还包括：接收到该再次请求的无线本地网网络侧判断该再次请求携带的区域信息是否包含在预先存储的该终端的漫游限制区域列表之中，如果是，将该终端切换到其请求的一个小区内，该终端到要切换的区域后继续呼叫；否则，对该终端进行拆呼叫处理。Before step C, the method further includes: after receiving the re-request, the wireless local network network side judges whether the area information carried in the re-request is included in the pre-stored roaming restricted area list of the terminal, and if so, the The terminal switches to a cell requested by the terminal, and continues calling after the terminal reaches the area to be switched; otherwise, the terminal performs call teardown processing.

从上述方案可以看出，本发明在网络侧设置了定时器，在首次收到有可能是由于呼叫信号的漂移或受到其他基站呼叫信号的抵触而发起的切换请求时，网络侧并不进行处理，而是判断如果在定时的时间内是否再次收到切换请求，再进行相应的切换。因此，本发明提供的方法能够实现当呼叫信号漂移时终端不进行频繁切换，从而使伴随切换的对终端的漫游限制判断次数减少，节约无线本地网的资源。更进一步的，本发明将上述方案和对终端的漫游限制判断过程相结合，实现当呼叫信号从签约区域漂移到非签约区域时，解决由于切换伴随漫游限制判断会导致的呼叫拆线。It can be seen from the above scheme that the present invention sets a timer on the network side, and when receiving the handover request that may be initiated due to the drift of the call signal or the conflict of other base station call signals for the first time, the network side does not process it. , instead of judging whether the switching request is received again within the timing time, and then performing the corresponding switching. Therefore, the method provided by the present invention can realize that the terminal does not perform frequent switching when the call signal drifts, thereby reducing the number of roaming restriction judgments on the terminal accompanying the switching, and saving the resources of the wireless local network. Furthermore, the present invention combines the above solution with the roaming restriction judgment process for the terminal to realize that when the call signal drifts from the subscribed area to the non-subscribed area, it can solve the call disconnection caused by the roaming restriction judgment caused by handover.

附图说明Description of drawings

图1为现有技术其中一种实现对终端漫游限制判断的过程流程图。FIG. 1 is a flow chart of a process for realizing roaming restriction judgment of a terminal in the prior art.

图2为本发明实现终端不进行频繁切换的方法流程图。FIG. 2 is a flow chart of the method for realizing that the terminal does not perform frequent switching according to the present invention.

图3为本发明实现当呼叫信号从签约区域漂移到非签约区域时，解决由于切换伴随漫游限制判断会导致的呼叫拆线的方法流程图。Fig. 3 is a flow chart of the method for solving the call disconnection caused by handover accompanied by roaming restriction judgment when the call signal drifts from the contracted area to the non-contracted area in the present invention.

图4为本发明实现当呼叫信号从签约区域漂移到非签约区域时，解决由于切换伴随漫游限制判断会导致的呼叫拆线的实施例示意图。Fig. 4 is a schematic diagram of an embodiment of the present invention that solves the problem of call disconnection caused by judgment of handover accompanied by roaming restriction when a call signal drifts from a subscription area to a non-subscription area.

具体实施方式Detailed ways

为了使本发明的目的、技术方案和优点更加清楚明白，以下举实施例并参照附图，对本发明进行进一步详细说明。In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

本发明的核心思想为：预先在管辖终端的无线本地网网络侧设置定时器，当终端发起切换请求时启动定时器，判断在定时器超时之前，终端是否再次发起切换请求，如果是，按照再次发送的切换请求进行切换，终端切换到要切换的区域后再继续呼叫；否则，不进行切换，终端的呼叫继续进行。The core idea of the present invention is: set a timer in advance on the wireless local network network side that governs the terminal, start the timer when the terminal initiates a handover request, and judge whether the terminal initiates a handover request again before the timer expires, and if so, proceed as follows The handover request sent is handed over, and the terminal continues to call after switching to the area to be handed over; otherwise, the handover is not performed, and the call of the terminal continues.

本发明必须在管辖终端的无线本地网网络侧设置一个定时器，该定时器可以设置在管辖终端的无线本地网网络侧的MSC中。In the present invention, a timer must be set on the side of the wireless local network that governs the terminal, and the timer can be set in the MSC on the side of the wireless local network that governs the terminal.

图2为本发明实现终端不进行频繁切换的方法流程图，其具体步骤为：Fig. 2 is the flow chart of the method for realizing that the terminal does not frequently switch in the present invention, and its specific steps are:

步骤200、终端通过当前区域所属的BSC向管辖终端的MSC发起切换请求；Step 200, the terminal initiates a handover request to the MSC in charge of the terminal through the BSC to which the current area belongs;

当终端从本小区移动到其他BSC管辖的另一个小区时，就会通过当前区域所属的BSC向MSC发起切换请求，该请求携带另一个小区区域信息的切换请求；When the terminal moves from its own cell to another cell under the jurisdiction of another BSC, it will initiate a handover request to the MSC through the BSC to which the current area belongs, and the request carries the handover request of the area information of another cell;

当终端在两个不同BSC所管辖不同小区的重叠区域时，会向MSC发起携带了两个不同小区区域信息的切换请求；When the terminal is in the overlapping area of different cells under the jurisdiction of two different BSCs, it will initiate a handover request to the MSC carrying the area information of the two different cells;

步骤201、MSC收到该切换请求后，启动定时器定时；Step 201, after the MSC receives the handover request, it starts a timer;

定时器的时长MSC可预先配置，也可以根据实际情况修改配置，这个具体的定时器时长没有一个确定的取值来源；The duration of the timer MSC can be pre-configured, and the configuration can also be modified according to the actual situation. There is no definite value source for the specific timer duration;

但是，通常情况下，定时的时间可以根据当前本地无线网的配置情况、呼叫信号漂移和受到其他基站呼叫信号的抵触的时限进行预先设置；However, under normal circumstances, the time of timing can be preset according to the configuration of the current local wireless network, the drift of the call signal and the time limit of the interference of the call signal of other base stations;

步骤202、MSC在定时器到时时判断是否收到该终端发起的再次切换请求，如果是，转入步骤203；否则，转入步骤204；Step 202, when the timer expires, the MSC judges whether it has received the re-handover request initiated by the terminal, if yes, proceeds to step 203; otherwise, proceeds to step 204;

如果终端在发起切换时网络侧没有对其进行切换或者切换不成功的话，终端会再次发起切换；If the network side does not switch or the switch is unsuccessful when the terminal initiates the switch, the terminal will initiate the switch again;

步骤203、MSC按照再次切换请求切换该终端，该终端到要切换的区域后再继续呼叫；Step 203, the MSC switches the terminal according to the switching request again, and continues calling after the terminal reaches the area to be switched;

步骤204、MSC对该终端不进行切换，终端的呼叫继续进行。In step 204, the MSC does not hand over the terminal, and the call of the terminal continues.

从图2所叙述的方法可以看出，该方法在无线本地网的网络侧设置了定时器，在首次收到有可能是由于呼叫信号的漂移或受到其他基站呼叫信号的抵触而发起的切换请求时，网络侧并不进行处理，而是判断如果在定时的时间内是否再次收到切换请求，再进行相应的处理。因此，本发明提供的方法能够实现当呼叫信号漂移时终端不进行频繁切换，从而使伴随切换的对终端的漫游限制判断次数减少，节约无线本地网的资源。From the method described in Figure 2, it can be seen that the method sets a timer on the network side of the wireless local network, and when receiving the handover request for the first time, it may be due to the drift of the call signal or the interference of the call signal of other base stations. , the network side does not process it, but judges whether the handover request is received again within the specified time, and then performs corresponding processing. Therefore, the method provided by the present invention can realize that the terminal does not perform frequent switching when the call signal drifts, thereby reducing the number of roaming restriction judgments on the terminal accompanying the switching, and saving the resources of the wireless local network.

更进一步的，本发明还可以将图2所叙述的方法和对终端的漫游限制判断过程相结合，实现当呼叫信号从签约区域漂移到非签约区域时，解决由于切换伴随漫游限制判断会导致的呼叫拆线。Furthermore, the present invention can also combine the method described in FIG. 2 with the roaming restriction judgment process of the terminal to realize that when the call signal drifts from the contracted area to the non-subscribed area, it can solve the problem caused by the roaming restriction judgment caused by handover. Call disconnect.

图3为本发明实现当呼叫信号从签约区域漂移到非签约区域时，解决由于切换伴随漫游限制判断会导致的呼叫拆线的方法流程图，其具体步骤为：Fig. 3 is the flow chart of the method for solving the call disconnection caused by handover accompanied by roaming restriction judgment when the call signal drifts from the contracted area to the non-signed area in the present invention, and its specific steps are:

步骤300、终端通过当前区域所属的BSC向管辖终端的MSC发起切换请求，该请求携带终端当前激活的所有区域信息；Step 300, the terminal initiates a handover request to the MSC in charge of the terminal through the BSC to which the current area belongs, and the request carries information about all areas currently activated by the terminal;

当终端从本小区移动到其他BSC管辖的另一个小区时，就会通过当前区域所属的BSC向MSC发起切换请求，该请求携带另一个小区的区域信息；When the terminal moves from its own cell to another cell under the jurisdiction of another BSC, it will initiate a handover request to the MSC through the BSC to which the current area belongs, and the request carries the area information of another cell;

当终端在两个不同BSC所管辖不同小区的重叠区域时，会向MSC发起携带了两个不同小区区域信息的切换请求；When the terminal is in the overlapping area of different cells under the jurisdiction of two different BSCs, it will initiate a handover request to the MSC carrying the area information of the two different cells;

步骤301、接收到该请求的MSC判断该请求携带的区域信息是否包含在预先在VLR的存储的该终端的漫游限制区域列表之中，如果是，执行步骤302；否则，执行步骤303；Step 301, the MSC receiving the request judges whether the area information carried by the request is included in the roaming restricted area list of the terminal stored in the VLR in advance, if yes, execute step 302; otherwise, execute step 303;

步骤302、MSC按照切换请求切换该终端，将该终端切换到其请求的一个小区内，该终端到要切换的区域后继续呼叫；Step 302, the MSC switches the terminal according to the switching request, switches the terminal to a cell requested by it, and continues calling after the terminal reaches the area to be switched;

步骤303、MSC启动定时器定时；Step 303, the MSC starts the timer timing;

定时的时间可以根据当前本地无线网的配置情况、呼叫信号漂移和受到其他基站呼叫信号的抵触的时限进行预先设置；The timing time can be preset according to the configuration of the current local wireless network, the drift of the call signal and the time limit of the conflict of the call signal of other base stations;

步骤304、MSC在定时器到时时判断是否收到该终端发起的再次切换请求，该切换请求携带了终端再次激活的所有区域信息，如果是，转入步骤305；否则，转入步骤308；Step 304, when the timer expires, the MSC judges whether it has received a re-handover request initiated by the terminal. The handover request carries all area information for the terminal to be reactivated. If yes, go to step 305; otherwise, go to step 308;

步骤305、接收到该再次切换请求的MSC判断该再次切换请求携带的区域是否包含在预先在VLR的存储的该终端的漫游限制区域列表之中，如果是，执行步骤306；否则，执行步骤307；Step 305, the MSC receiving the re-handover request judges whether the area carried by the re-handover request is included in the roaming restricted area list of the terminal stored in the VLR in advance, if yes, execute step 306; otherwise, execute step 307 ;

步骤306、MSC按照再次切换请求切换该终端，将该终端切换到其请求的一个小区内，该终端到要切换的区域后继续呼叫；Step 306, the MSC switches the terminal according to the switching request again, switches the terminal to a cell requested by it, and continues calling after the terminal reaches the area to be switched;

步骤307、MSC按照再次切换请求切换该终端，由于该终端要请求切换的区域不在VLR存储的该终端的漫游限制区域列表之中，所以MSC对该终端进行拆除呼叫处理；Step 307, the MSC switches the terminal according to the handover request again, because the area where the terminal will request switching is not in the roaming restricted area list of the terminal stored in the VLR, so the MSC performs teardown call processing on the terminal;

步骤308、MSC对该终端不进行切换，终端的呼叫继续进行。In step 308, the MSC does not hand over the terminal, and the call of the terminal continues.

从图3的叙述可以看出，当终端发起切换请求并且该切换请求要将该终端切换到其非签约区域时，无线本地网的网络侧并不执行该处理，而是设置定时器定时，判断如果在定时的时间内是否再次收到切换请求，再进行相应的处理：如果再次切换请求还是要将终端切换到非签约区域，再进行拆除当前呼叫的处理，否则，进行切换到签约区域，保持呼叫的继续。因此，本发明提供的方法当呼叫信号从签约区域漂移到非签约区域时，解决由于切换伴随漫游限制判断会导致的呼叫拆线。It can be seen from the description in Fig. 3 that when a terminal initiates a handover request and the handover request is to hand over the terminal to its non-contracted area, the network side of the wireless local network does not perform this process, but sets a timer to determine If the switching request is received again within the fixed time, then corresponding processing is performed: if the switching request is received again, the terminal must be switched to the non-contracted area, and then the current call is removed; otherwise, the terminal is switched to the contracted area and kept Continuation of the call. Therefore, in the method provided by the present invention, when the call signal drifts from the subscription area to the non-subscription area, the call disconnection caused by handover and roaming restriction judgment can be solved.

值得说明一点的是，无线本地网的网络侧虽然没有处理终端发起的首次切换请求，但是终端还处于呼叫继续的状态，这是因为：终端在发起首次切换请求时，其不可能直接从一个小区跨入到另一个小区，而是先在当前呼叫小区和要切换小区的重叠区域再到要切换的小区；终端处于重叠区域时，在终端的呼叫信号进行短暂的漂移或受到要切换小区的呼叫信号的抵触的同时，终端还能收到当前小区呼叫的信号。It is worth noting that although the network side of the wireless local network does not process the first handover request initiated by the terminal, the terminal is still in the call continuation state. This is because: when the terminal initiates the first handover request, it cannot Stepping into another cell, but first in the overlapping area of the current calling cell and the cell to be switched, and then to the cell to be switched; when the terminal is in the overlapping area, the call signal of the terminal drifts briefly or is called by the cell to be switched At the same time as the signal conflicts, the terminal can still receive the signal of the current cell call.

以下举一个具体的实施例说明本发明图3叙述的方法。A specific embodiment is given below to illustrate the method described in FIG. 3 of the present invention.

图4为本发明实现当呼叫信号从签约区域漂移到非签约区域时，解决由于切换伴随漫游限制判断会导致的呼叫拆线的实施例示意图，如图所示：Figure 4 is a schematic diagram of an embodiment of the present invention that solves the problem of call disconnection caused by handover accompanied by roaming restriction judgment when the call signal drifts from the contracted area to the non-signed area, as shown in the figure:

假设终端A被限定在MSC1下的小区A漫游，终端A出小区A后无法进行主叫和被叫。Assuming that terminal A is restricted to roaming in cell A under MSC1, terminal A cannot make calling and called calls after leaving cell A.

本发明首先在HLR中签约终端A限定漫游的区域：MSC1+小区A，HLR将该终端的漫游限制区域列表发送到管辖该终端的MSC的VLR中保存。In the present invention, firstly, the contracted terminal A in the HLR limits the roaming area: MSC1+cell A, and the HLR sends the roaming restricted area list of the terminal to the VLR of the MSC which governs the terminal for storage.

当终端A当前正在呼叫并且处于小区A和小区B的重叠区时，终端A的呼叫信号漂移或遇到小区B呼叫信号的抵触而导致终端A要切换到小区B，则通过小区A所属的BSC向MSC发起携带小区B区域的切换请求。MSC根据VLR保存的该终端的漫游限制区域列表判断小区B区域为非签约区域，则启动定时器定时，在定时器定时到时时，会出现两种情况，本发明根据这两种情况进行相应的处理：When terminal A is currently calling and is in the overlapping area of cell A and cell B, the call signal of terminal A drifts or encounters the interference of the call signal of cell B, causing terminal A to switch to cell B, then through the BSC to which cell A belongs Initiate a handover request carrying the cell B area to the MSC. The MSC judges that the cell B area is a non-subscription area according to the roaming restricted area list of the terminal saved by the VLR, and then starts the timer for timing. When the timer expires, two situations will occur. deal with:

1、在定时器定时到时时或到时之前，MSC收到终端A发起的切换到A的切换请求，停止定时器，呼叫继续；1. When the timer expires or before the time expires, the MSC receives a handover request initiated by terminal A to switch to A, stops the timer, and continues the call;

2、定时器定时超时或在定时器到时之前又收到携带小区B区域的切换请求，并且没有收到切换到A的切换请求，则拆除本次呼叫。2. When the timer expires or before the timer expires, it receives a handover request carrying cell B, and does not receive a handover request to A, then the call is dismantled.

以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所做的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention. within the scope of protection.

Claims (5)

1, a kind of method that solves the terminal repeating switching is characterized in that at wireless local net network side timer is set, this method also comprises:

A, terminal are initiated handoff request to the network side of local network;

The network side of B, local network starts timer regularly, judges at timer to the handoff request once more of whether receiving that constantly this terminal is initiated, if change step C over to; Otherwise the network side of local network does not switch this terminal, and the calling of terminal is proceeded;

The network side of C, local network switches this terminal according to handoff request once more, and this terminal continues to call out to the back, zone that will switch.

2, the method for claim 1 is characterized in that, described timer is arranged in the mobile switching centre of wireless local net network side.

3, the method for claim 1, it is characterized in that the described timer of the step B time regularly sets in advance according to configuring condition, the call signal drift of current local wireless network and time limit of conflict of being subjected to the base station call signal of non-current region.

4, the method for claim 1 is characterized in that, the described handoff request of steps A carries the area information of all sub-districts of the current activation of terminal;

Before step B, this method also comprises: the wireless local net network side that receives this request judges whether the area information that this request is carried is included among the roaming restricted area tabulation of this terminal of storing in advance, if, this terminal is switched in the sub-district of its request, this terminal continues to call out to the back, zone that will switch; Otherwise, execution in step B.

As claim 1 or 4 methods of being narrated, it is characterized in that 5, the described handoff request once more of step B carries the area information that terminal activates all sub-districts once more;

Before step C, this method also comprises: receive this wireless local net network side of asking once more and judge whether this area information of asking once more to carry is included among the roaming restricted area tabulation of this terminal of storing in advance, if, this terminal is switched in the sub-district of its request, this terminal continues to call out to the back, zone that will switch; Otherwise, this terminal is torn open call treatment.

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