CN1327744C - Method for realizing roaming user preferential access wireless channel - Google Patents

Abstract

The present invention discloses a method enabling a roaming subscriber to have the priority to be accessed into wireless channels. The corresponding relationship between a roaming subscriber and a PACA grade is configured on an MSC/VLR in advance. The method comprises the following steps that the MSC/VLR judges whether a subscriber within own coverage area is a roaming subscriber or not, if true, then a PACA grade is distributed to the roaming subscriber according to the corresponding relationship between the roaming subscriber and the PACA grade; the MSC/VLR judges whether available wireless channels exist in wireless resources when the roaming subscriber needs connection calls, if true, then a wireless channel is distributed to the roaming subscriber; else the telephone channels of subscribers with lower PACA grades than the roaming subscriber are disengaged according to the PACA grade distributed to the roaming subscriber, and wireless channels occupied by the telephone channels are released and distributed to the roaming subscriber; the roaming subscriber is accessed into the wireless channel distributed by the MSC/VLR.

Description

A Method for Realizing Roaming User's Priority Access to Wireless Channel

technical field

The invention relates to mobile communication technology, in particular to a method for realizing roaming users preferentially accessing wireless channels.

Background technique

In the mobile communication network, the capacity of the wireless channel of the cellular mobile cell is limited, and only a certain number of users can be allowed to communicate at the same time. In densely populated stadiums, downtown areas or stations, etc., due to the large number of users who need to make calls, the number of users often exceeds the capacity of the wireless channel of the community, resulting in a large number of users unable to use mobile phones to communicate normally.

For roaming users, the communication services that occur during roaming are usually relatively important communication services, and the communication rate at this time is higher than that when the user does not roam, which can bring more benefits to operators. big payoff. Therefore, in order to prevent the communication services of roaming users from being affected by the limitation of wireless channel capacity and to enable operators to obtain greater profits, both roaming users and operators hope that roaming users can access wireless channels preferentially.

In the existing Priority Access and Channel Assignment (PACA) service solution, only when the user signs up for the PACA service, the system can assign wireless channels to the user according to the signed PACA level, so that users with higher PACA levels can have priority access wireless channel. If the user has not signed the PACA service, the system will default the user's PACA level to the lowest, and the user will not be able to access the wireless channel preferentially.

The PACA service signed by the user is carried out on the home location register (HLR). The existing PACA service needs the support of the HLR. If the HLR does not support the PACA service, the user cannot use the PACA service.

After the user subscribes to the PACA service, the HLR can send the user's subscription information to the user service mobile switching center/temporary location register (MSC/VLR) according to the user's location registration, qualification request or qualification instruction. When the user is calling or called, the serving MSC/VLR can assign wireless channels to the user according to the PACA level of the user's subscription. If the capacity of the wireless channel is full, the serving MSC/VLR will release the user with a low PACA level. The wireless channel is used by users with high PACA level, so that users with high PACA level can access the wireless channel preferentially.

However, roaming users are not necessarily users who have subscribed to the PACA service. When those users who have not signed the PACA service roam, they may not be able to access the wireless channel due to the limitation of the wireless channel capacity. Therefore, the implementation of the existing PACA service is limited by the user subscription, and the user subscription is used as the basis for PACA service authorization, which cannot meet the needs of roaming users to access wireless channels preferentially.

At the same time, the existing PACA service requires the support of the HLR. If the HLR does not support the PACA service, the user cannot use the PACA service. Currently, there are many types of HLRs, and some types of HLRs do not support PACA services. For international roaming users and domestic roaming users, if their home HLR does not support PACA services, even if roaming users want to sign up for PACA services, they cannot sign up for PACA services, and thus cannot enjoy the priority access to wireless channels provided by PACA services. Therefore, the implementation of the PACA service requires users to sign a contract on the HLR, which also restricts roaming users from preferentially accessing wireless channels, so that the needs of roaming users to preferentially access wireless channels cannot be met.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for enabling roaming users to access wireless channels preferentially, so as to meet the needs of roaming users for preferentially accessing wireless channels.

For achieving the above object, the present invention provides a kind of method that realizes that roaming user preferentially accesses the wireless channel, key is, configure the corresponding relationship between roaming user and PACA grade on MSC/VLR in advance, this method at least comprises the following steps:

A, MSC/VLR judges whether the user within the self-coverage area is a roaming user, and if so, assigns the PACA level to the roaming user according to the corresponding relationship between the roaming user and the PACA level;

B. When the MSC/VLR needs to connect the call for the roaming user, it judges whether there is an available wireless channel in the wireless resource, and if so, assigns a wireless channel for the roaming user in the available wireless channel; otherwise, according to The PACA level assigned by the roaming user, remove the voice channel of the user with a lower PACA level than the roaming user in the local office, release the wireless channel occupied by the voice channel, and assign the released wireless channel to the roaming user;

C. The roaming user accesses the wireless channel assigned by the MSC/VLR.

In the above scheme, the MSC/VLR described in step A judges whether the user within its own coverage area is a roaming user: MSC/VLR judges according to the IMSI prefix corresponding to the user number.

In the above scheme, all types of roaming users on the MSC/VLR are configured to correspond to the same PACA level, and in step A, according to the correspondence between the roaming user and the PACA level, assigning the PACA level to the roaming user includes: MSC/VLR will The configured PACA level is assigned to the roaming user.

In the above-mentioned scheme, described on MSC/VLR configures different types of roaming users to correspond to different PACA grades respectively, in step A according to the corresponding relationship between described roaming users and PACA grades, assigning PACA grades to this roaming user comprises: MSC/VLR according to The corresponding relationship between different types of roaming users and PACA levels is configured, and the PACA level corresponding to this type of roaming users is assigned to the roaming users.

In the above solution, configuring different types of roaming users corresponding to different PACA levels on the MSC/VLR includes: configuring international roaming users and domestic roaming users corresponding to different PACA levels on the MSC/VLR.

In the above-mentioned scheme, the roaming user has signed a PACA service, and the MSC/VLR assigns a PACA level to the roaming user according to the PACA service signed by the roaming user; the MSC/VLR described in step A is based on the relationship between the roaming user and the PACA level Assigning the PACA level to the roaming user further includes: MSC/VLR selects a higher PACA level from the PACA level determined according to the correspondence between the roaming user and the PACA level and the PACA level determined according to the PACA service signed by the roaming user As the PACA level assigned to the roaming user.

In the above scheme, the roaming user is used as the calling party, and the MSC/VLR described in step B judges whether there is an available wireless channel in the wireless resource: MSC/VLR according to the wireless channel carried in the connection management service request message from the BSC The channel uses the information to make a judgment.

In the above scheme, the roaming user is used as the called party, and the MSC/VLR described in step B judges whether there is an available wireless channel in the wireless resource: MSC/VLR uses the wireless channel according to the wireless channel carried in the paging message from the BSC information to judge.

In the above-mentioned scheme, the MSC/VLR described in the step B assigns a wireless channel for the roaming user in the available wireless channels and includes: the MSC/VLR selects a wireless channel in the available wireless channels, and the wireless channel identification is passed The response message is returned to the BSC, and the wireless channel is assigned to the roaming user through the BSC.

In the above scheme, assigning the released wireless channel to the roaming user by the MSC/VLR described in step B includes: MSC/VLR returns the identifier of the released wireless channel to the BSC through a response message, and sends the released wireless channel to the BSC through the BSC. assigned to the roaming user.

Therefore, the method for implementing roaming users to preferentially access wireless channels provided by the present invention, by pre-configuring the corresponding relationship between roaming users and PACA levels on the MSC/VLR, the MSC/VLR can According to the corresponding relationship, the PACA level is assigned to the user roaming to its own coverage area, and when the MSC/VLR needs to connect the call for the roaming user, it will assign the wireless channel to the roaming user preferentially according to the assigned PACA level, so that the roaming user can give priority to Access the wireless channel.

Utilize the present invention, because MSC/VLR can distribute PACA level for the user that roams to oneself coverage area according to the corresponding relation of pre-configured roaming user and PACA level, and when MSC/VLR needs to connect the call for this roaming user, according to the distribution The PACA level assigns the wireless channel to the roaming user preferentially, so that the roaming user can preferentially access the wireless channel without signing the PACA service. Therefore, the roaming user's priority access to the wireless channel has nothing to do with whether the roaming user subscribes to the PACA service, which meets the needs of the roaming user's priority access to the wireless channel.

At the same time, because the roaming user can access the wireless channel preferentially, the communication service of the roaming user is guaranteed, which in turn enables the operator to obtain greater profits and protects the interests of the operator. In addition, since the user can preferentially access the wireless channel without signing the PACA service when roaming, the PACA level assigned to the user by the MSC/VLR will be automatically canceled after the user returns to the home location, so the user does not need to pay The cost of opening the PACA service reduces unnecessary expenses for users.

Description of drawings

Fig. 1 is the flow chart of the method of the present invention to realize the overall technical solution of roaming users preferentially accessing the wireless channel;

FIG. 2 is a flow chart of a method for implementing a roaming user's priority access to a wireless channel when the roaming user is the calling party in an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the following examples are given and the present invention is further described in detail with reference to the accompanying drawings.

The core content of the present invention is: by pre-configuring the corresponding relationship between roaming users and PACA levels on the MSC/VLR, the MSC/VLR can allocate PACA level, and when the MSC/VLR needs to connect the call for the roaming user, according to the assigned PACA level, assign wireless channels to the roaming user preferentially, so that the roaming user can preferentially access the wireless channel.

As shown in Figure 1, Fig. 1 is the flow chart of the method that realizes that roaming user preferentially accesses the overall technical scheme of wireless channel in the present invention, configures the corresponding relationship between roaming user and PACA grade on MSC/VLR in advance, and this method at least comprises the following steps:

Step 101: MSC/VLR judges whether the user within its own coverage area is a roaming user, if yes, then execute step 102; otherwise, end this process;

Step 102: The MSC/VLR assigns the roaming user a PACA level according to the correspondence between the roaming user and the PACA level;

Step 103: When the MSC/VLR needs to connect the call for the roaming user, judge whether there is an available wireless channel in the wireless resource, if yes, then perform step 104; otherwise, perform step 105;

Step 104: MSC/VLR assigns a wireless channel to the roaming user in available wireless channels, and the roaming user accesses the wireless channel assigned by MSC/VLR;

Step 105: According to the PACA level assigned to the roaming user, the MSC/VLR removes the voice channel of the user whose local office has a lower PACA level than the roaming user, releases the wireless channel occupied by the voice channel, and assigns the released wireless channel to the roaming user User, the roaming user accesses the wireless channel assigned by the MSC/VLR.

For the above pre-configured correspondence between roaming users and PACA levels on the MSC/VLR, when configuring the correspondence, you can configure on the MSC/VLR that all types of roaming users correspond to the same PACA level. Different types of roaming users configured on the VLR correspond to different PACA levels. In addition, the corresponding relationship between roaming users and PACA levels configured on the MSC/VLR can also be modified according to actual needs.

If all types of roaming users are configured on the MSC/VLR to correspond to the same PACA level, roaming users and local users can be distinguished. At this point, when a certain user roams within the range covered by the MSC/VLR, the MSC/VLR will assign the configured PACA level corresponding to all types of roaming users to the roaming user.

If different types of roaming users are configured on the MSC/VLR to correspond to different PACA levels, for example, if international roaming users and domestic roaming users are configured to correspond to different PACA levels, not only can roaming users and local users be distinguished, but also can be further distinguished International roaming users and domestic roaming users among roaming users. At this point, when a certain user roams into the range covered by the MSC/VLR, the MSC/VLR will assign the configured PACA level corresponding to this type of roaming user to the roaming user.

Generally, since the communication fee rate of international roaming users is higher than that of domestic roaming users, a higher PACA level can be configured for international roaming users, and a lower PACA level can be configured for domestic roaming users. It can access wireless channels better than domestic roaming users, and domestic roaming users can access wireless channels better than local users.

Of course, in some cases, it is also possible to configure a higher PACA level for domestic roaming users and a lower PACA level for international roaming users, so that domestic roaming users can access wireless channels better than international roaming users. It can be superior to local users in accessing wireless channels.

For the MSC/VLR described in step 101 to judge whether the user within its own coverage is a roaming user, it is performed by the MSC/VLR according to the International Mobile Subscriber Identity (IMSI) prefix corresponding to the user number.

IMSI is a number assigned to uniquely identify a mobile user internationally, including fifteen digits. Generally, the IMSI prefix is the first eleven digits in the IMSI string. In the IMSI prefix, the first three digits are used to represent different countries, the fourth to fifth digits are used to represent different operators in the same country, and the eighth to eleventh digits are used to represent different cities in the same country or region.

Since the region served by each MSC is fixed, the IMSI prefix assigned by each MSC to users within its own coverage area is also fixed, and the IMSI prefix in each region is different. Therefore, MSC/VLR can determine whether the user is a local user or a roaming user according to the user's IMSI prefix. If the user is a roaming user, it can further determine whether the user is an international roaming user or a domestic roaming user.

In actual implementation, MSC/VLR can judge by querying its own user type table. The structure of the table is as follows:

MSCID IMSI prefix user type X 46003091234   Domestic Roaming Users ... ... ...

In the above table, the Mobile Switching Center ID (MSCID) consists of SYSTEM ID and SWITCH NO., which is used to uniquely identify an MSC. In the above user type table, the MSCID needs to be configured as the MSCID of this MSC. User types include local users, domestic roaming users and international roaming users.

The MSC/VLR can determine the type of the user by querying the above user type table for the users within its own coverage area. Generally, when a roaming user roams to a place, he needs to register with the local MSC/VLR, and the MSC/VLR queries the above-mentioned user type table for the registered user to determine the type of the user.

According to the corresponding relationship between the roaming user and the PACA level described in step 102, assign the PACA level to the roaming user, if all types of roaming users are configured on the MSC/VLR to correspond to the same PACA level, then assign the PACA level for roaming users. If different types of roaming users are configured on the MSC/VLR to correspond to different PACA levels, then the PACA level corresponding to this type of roaming users is assigned to this type of roaming users.

For example, on the MSC/VLR, configure international roaming users to correspond to a higher PACA level, and configure domestic roaming users to correspond to a lower PACA level. After the MSC/VLR determines that the user is an international roaming user, the A higher PACA level is allocated to the international roaming user; after the MSC/VLR judges that the user is a domestic roaming user, a lower PACA level corresponding to the domestic roaming user can be allocated to the domestic roaming user.

In addition, if the roaming user subscribes to the PACA service at the same time, the MSC/VLR assigns the PACA level to the roaming user according to the configured correspondence between the roaming user and the PACA level, and assigns the PACA level to the user with the MSC/VLR according to the PACA service signed by the user. There is no conflict. At this time, MSC/VLR can be set to allocate PACA level to the roaming user according to the corresponding relationship between roaming users and PACA levels configured, or MSC/VLR can be set to select the higher PACA level of the above two basis to allocate PACA level to the user. grade.

Specifically, if MSC/VLR is configured to assign PACA levels to roaming users according to the configured correspondence between roaming users and PACA levels, after users who have signed up for PACA services roam to the coverage area of MSC/VLR, MSC/VLR Whether the user is a roaming user, if so, assign a PACA level to the roaming user according to the configured correspondence between roaming users and PACA levels; otherwise, do not assign a PACA level to the roaming user.

If the MSC/VLR is set to select the higher PACA level of the above two bases to assign the PACA level to the user, after the user who signed the PACA service roams to the coverage area of the MSC/VLR, the MSC/VLR will use the configured roaming user and The corresponding relationship between the PACA level and the PACA service signed by the user is to assign a PACA level to the roaming user respectively, then compare the two PACA levels, and select the higher PACA level as the PACA level assigned to the roaming user.

In order to more clearly illustrate the method for realizing the preferential access of wireless channels for roaming users provided by the present invention, it will be described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

As shown in FIG. 2 , FIG. 2 is a flowchart of a method for implementing a roaming user to preferentially access a wireless channel when a roaming user is a calling party in an embodiment of the present invention. In this embodiment, the corresponding relationship between roaming users and PACA levels is pre-configured on the MSC/VLR. A roaming user is assigned a PACA rating, and the method includes the following steps:

Step 201: the roaming user initiates a call, the base station controller (BSC) receives the call information of the roaming user, checks whether there is an available wireless channel in the wireless resource, and sends a connection management service request carrying wireless channel usage information to the MSC/VLR (CM Service Req) message, requesting MSC/VLR to assign a wireless channel for the roaming user;

The radio channel usage information is generally reflected by the parameters contained in the CM Service Req message: if the BSC checks that there is no available radio channel in the radio resources, the BSC will set the available value of the parameter Radio Environment and Resources in the CMService Req message to 0; if The BSC checks and finds that there are available wireless channels in the wireless resources, and the BSC will not set the parameter Radio Environment and Resources in the CM ServiceReq message.

Step 202: The MSC/VLR receives the CM Service Req message, and judges whether there is an available wireless channel in the wireless resource according to the wireless channel usage information carried in the CM Service Req message, if it is found that the parameter Radio Environment is not set in the CM Service Req message andResources, then it indicates that there is an available wireless channel in the wireless resource, and step 203 is performed; otherwise, if the avail of the parameter Radio Environment andResources contained in the CM Service Req message is found to be 0, then it indicates that there is no available wireless channel in the wireless resource, and execution Step 204.

Step 203: MSC/VLR selects a wireless channel among the available wireless channels according to the PACA grade allocated for the roaming user, and returns the wireless channel identifier to the BSC in the connection management service request response message, and sends the wireless channel to the BSC through the BSC. A channel is assigned to the roaming user, and the roaming user accesses the wireless channel assigned by the MSC/VLR.

Step 204: MSC/VLR dismantles the voice channel of the user whose local office is lower than the PACA level of the roaming user according to the PACA level allocated for the roaming user, releases the wireless channel occupied by the voice channel, and carries the identifier of the released wireless channel in the The connection management service request response message is returned to the BSC, and the released wireless channel is assigned to the roaming user through the BSC, and the roaming user accesses the wireless channel assigned by the MSC/VLR.

In this way, when a roaming user initiates a call as the calling party, but there is no wireless channel available in the wireless resource, the MSC/VLR will remove the voice channel of the user whose PACA level is lower than that of the roaming user in the local office according to the PACA level allocated to the roaming user, and release The wireless channel occupied by the voice channel, and assign the released wireless channel to the roaming user through the BSC, so that the roaming user can preferentially access the wireless channel.

In this embodiment of the present invention, the roaming user acts as the calling party, and the MSC/VLR judges whether there is an available wireless channel in the wireless resource according to the wireless channel usage information carried in the CM Service Req message received from the BSC. In practical applications, the roaming user can also be called. At this time, the MSC judges whether there is an available wireless channel in the wireless resource according to the wireless channel usage information carried in the paging message received from the BSC.

If there is an available wireless channel in the wireless resource, the MSC/VLR selects one of the available wireless channels according to the PACA level assigned to the roaming user, and returns the wireless channel identifier to the BSC in the paging response message , the wireless channel is assigned to the roaming user through the BSC, and the roaming user accesses the wireless channel assigned by the MSC/VLR.

If there is no available wireless channel in the wireless resource, the parameter RadioEnvironment and Resources in the paging message will be set to 0, and the MSC/VLR will remove the PACA level of the local office lower than the roaming user's PACA level according to the PACA level assigned to the roaming user. The user’s voice channel releases the wireless channel occupied by the voice channel, and returns the identifier of the released wireless channel in the paging response message to the BSC, and assigns the released wireless channel to the roaming user through the BSC. Enter the wireless channel assigned by MSC/VLR. Such a technical solution is consistent with the technical solution of the present invention, and will not be repeated here.

As can be seen from the above embodiments, the method for implementing roaming users to preferentially access wireless channels provided by the present invention, by configuring the corresponding relationship between roaming users and PACA levels on the MSC/VLR in advance, the MSC/VLR can The configured corresponding relationship between roaming users and PACA levels assigns PACA levels to users who roam to their own coverage area, and when MSC/VLR needs to connect calls for the roaming users, assign wireless channels to the roaming users preferentially according to the assigned PACA level , so that the roaming user can preferentially access the wireless channel.

Utilize the present invention, because MSC/VLR can distribute PACA level for the user that roams to oneself coverage area according to the corresponding relation of pre-configured roaming user and PACA level, and when MSC/VLR needs to connect the call for this roaming user, according to the distribution The PACA level assigns the wireless channel to the roaming user preferentially, so that the roaming user can preferentially access the wireless channel without signing the PACA service. Therefore, the roaming user's priority access to the wireless channel has nothing to do with whether the roaming user subscribes to the PACA service, which meets the needs of the roaming user's priority access to the wireless channel.

At the same time, because the roaming user can access the wireless channel preferentially, the communication service of the roaming user is guaranteed, which in turn enables the operator to obtain greater profits and protects the interests of the operator. In addition, since the user can preferentially access the wireless channel without signing the PACA service when roaming, the PACA level assigned to the user by the MSC/VLR will be automatically canceled after the user returns to the home location, so the user does not need to pay The cost of opening the PACA service reduces unnecessary expenses for users.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1, a kind of method that realizes that roaming user preferentially accesses wireless channel, it is characterized in that, on Mobile Switching Center/Temporary Location Register MSC/VLR, configure the corresponding relationship between roaming user and priority access and channel assignment PACA level in advance, the The method at least includes the following steps: A, MSC/VLR judges whether the user within the self-coverage area is a roaming user, and if so, assigns the PACA level to the roaming user according to the corresponding relationship between the roaming user and the PACA level; B. When the MSC/VLR needs to connect the call for the roaming user, it judges whether there is an available wireless channel in the wireless resource, and if so, assigns a wireless channel for the roaming user in the available wireless channel; otherwise, according to The PACA level assigned by the roaming user, remove the voice channel of the user with a lower PACA level than the roaming user in the local office, release the wireless channel occupied by the voice channel, and assign the released wireless channel to the roaming user; C. The roaming user accesses the wireless channel assigned by the MSC/VLR. 2. The method according to claim 1, characterized in that the MSC/VLR described in step A judges whether the user within the coverage of itself is a roaming user: MSC/VLR judges according to the IMSI prefix corresponding to the subscriber number. 3. The method according to claim 1, characterized in that all types of roaming users configured on the MSC/VLR correspond to the same PACA level, Allocating a PACA level to the roaming user according to the correspondence between the roaming user and the PACA level in step A includes: MSC/VLR assigning the configured PACA level to the roaming user. 4. The method according to claim 1, characterized in that configuring different types of roaming users on the MSC/VLR corresponds to different PACA levels, In step A, according to the corresponding relationship between the roaming user and the PACA level, assigning the PACA level to the roaming user includes: MSC/VLR assigns the PACA level corresponding to the roaming user of this type according to the corresponding relationship between the different types of roaming users and the PACA level configured. A class is assigned to the roaming user. 5. The method according to claim 4, wherein configuring different types of roaming users corresponding to different PACA levels on the MSC/VLR comprises: Configure international roaming users and domestic roaming users on the MSC/VLR to correspond to different PACA levels. 6. The method according to claim 1, wherein the roaming user has signed a PACA service, and the MSC/VLR assigns a PACA level to the roaming user according to the PACA service signed by the roaming user; The MSC/VLR described in step A assigns the PACA level to the roaming user according to the corresponding relationship between the roaming user and the PACA level and further includes: The MSC/VLR selects a higher PACA level as the PACA level assigned to the roaming user from the PACA level determined according to the correspondence between the roaming user and the PACA level and the PACA level determined according to the PACA service signed by the roaming user. 7. The method according to claim 1, wherein the roaming user is used as a calling party, and the MSC/VLR in step B judges whether there is an available wireless channel in the wireless resource as follows: The MSC/VLR judges according to the wireless channel usage information carried in the connection management service request message from the base station controller BSC. 8. The method according to claim 1, wherein the roaming user is the called party, and the MSC/VLR in step B judges whether there is an available wireless channel in the wireless resource as follows: The MSC/VLR judges according to the radio channel usage information carried in the paging message from the BSC. 9. The method according to claim 7 or 8, wherein the MSC/VLR in step B assigning a wireless channel to the roaming user in the available wireless channels includes: The MSC/VLR selects a wireless channel from the available wireless channels, returns the identification of the wireless channel to the BSC through a response message, and assigns the wireless channel to the roaming user through the BSC. 10. The method according to claim 7 or 8, characterized in that, assigning the released wireless channel to the roaming user by the MSC/VLR described in step B comprises: The MSC/VLR returns the identifier of the released wireless channel to the BSC through a response message, and assigns the released wireless channel to the roaming user through the BSC.

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