CN1522078A - A wireless local telephone system and method for realizing roaming - Google Patents

Abstract

The present invention provides a new wireless local telephone system, including a home communication system and at least one visiting communication system; both the home communication system and the visiting communication system include a base transceiver station, a base station controller, a local exchange and roaming management The base transceiver station, the base station controller, and the local switch constitute an ordinary wireless access system, the roaming manager is connected with the base station controller, and controls the base station controller to complete the call transfer instruction; the roaming manager in the home communication system and the The roaming managers of the visiting communication system are connected through Ethernet. The present invention avoids the problem of establishing a voice channel between base stations, reduces the equipment needed to establish a voice channel, and achieves the purpose of reducing the economic cost of the system; the present invention also makes full use of the call transfer function possessed by the original system, and This function is very stable, so that the system of the present invention is established on a stable basis, thereby improving the stability of the system.

Description

A wireless local telephone system and method for realizing roaming

technical field

The invention relates to a mobile communication system, in particular to a new wireless local telephone system and a roaming method thereof.

Background technique

Currently, in the wireless local telephone system in the field of mobile communication, especially in the wireless local telephone system based on the local exchange, the mobile station cannot roam between the base station systems. However, with the continuous expansion of the capacity of the wireless local telephone system, if the capacity of one base station system is not enough to cover a city, multiple base station systems need to jointly complete the coverage of a city. At this time, when a mobile station moves within the city, it will encounter the problem of roaming among multiple base station systems.

At present, the roaming of the mobile station in the GSM and CDMA mobile communication systems is generally realized through the mobile switching center on the switching side to manage the location information of the mobile station. There is no mobile station location management function, so up to now, the wireless local telephone system based on the local exchange cannot realize the roaming of the mobile station between the base station systems. How to support the roaming of the mobile station between multiple base station systems in a simple and effective manner has become a problem that needs to be solved urgently.

Contents of the invention

The technical problem to be solved by the present invention is to provide a new wireless local telephone system and its method for realizing roaming, so as to solve the problem that the current wireless local telephone system based on local exchanges cannot realize roaming between base station systems.

The wireless local telephone system of the present invention includes a home communication system and at least one visited communication system, and both the home communication system and the visited communication system include a base transceiver station, a base station controller, a local exchange and a roaming manager; the base station transceiver, base station controller, and local exchange constitute a common wireless access system, the roaming manager is connected to the base station controller, and controls the base station controller to complete the call transfer instruction; The roaming manager in the home communication system is connected to the roaming manager in the visiting communication system through Ethernet.

The wireless local telephone system of the present invention realizes the roaming method, comprises the following steps:

1. When the mobile station performs roaming registration, the visited base station system notifies the home base station system to set call forwarding on the home local exchange, and the transferred target number belongs to the number range of the visited local exchange;

2. When the mobile station is paged by roaming, the local exchange at home automatically transfers the paging to the local exchange at the visiting site according to the set call forwarding number, and the local exchange at the visiting site completes the paging process according to the normal paging process. call.

The roaming registration process of the mobile station specifically includes the following steps:

1. The visited base station controller receives the roaming registration request from the mobile station;

2. The base station controller of the visited place notifies the roaming manager of the visited place of the roaming registration request;

3. The roaming manager of the visited location notifies the roaming manager of the home location of the mobile station of the mobile station's request for roaming registration;

4. The home roaming manager notifies the home base station controller to set the call forwarding to a number of the visited base station system to the home exchange, and retains the location information of the mobile station;

5. The home roaming manager completes the authentication response to the visited roaming manager;

6. The visited roaming manager retains the subscription information of the mobile station.

The roaming paging process of the mobile station includes the following steps:

1. The home exchange receives the paging request from the mobile station;

2. The home local exchange transfers the paging request to the visiting local exchange;

3. The local exchange at the visited place sends the paging request to the base station controller at the visited place;

4. The visited base station controller requests the visited roaming manager to authenticate the roaming mobile station;

5. After the authentication is completed, the visited base station controller completes the subsequent paging process.

The roaming method of the present invention also includes the roaming calling process of the mobile station, which specifically includes the following steps:

1. The mobile station initiates a roaming call request to the visited base station controller;

2. The visited base station controller requests the visited roaming manager to authenticate the mobile station; after passing the authentication, the visited base station controller completes the subsequent call process.

The system and the roaming method of the invention greatly reduce the complexity of the roaming scheme, shorten the development period and save the development cost. Since the present invention avoids the problem of establishing voice channels between base stations, it reduces the equipment needed to establish voice channels, and achieves the purpose of reducing system economic costs. In addition, the present invention makes full use of the call forwarding function of the original system, and this function is very stable, so that the system of the present invention is established on a stable basis, thereby improving the stability of the system.

Description of drawings

Fig. 1 is the structural representation of wireless local telephone system of the present invention;

Fig. 2 is a schematic diagram of the roaming registration process of the mobile station in the present invention;

Fig. 3 is a schematic diagram of a call process in which a roaming user is used as an initiating call in the present invention;

Fig. 4 is a schematic diagram of the calling process of the roaming user as paging (final call) in the present invention.

Detailed ways

The wireless local telephone system based on the local exchange and the method for realizing roaming of the present invention will be described in detail below according to the drawings and embodiments.

The wireless local telephone system and its roaming implementation method of the present invention are a simple and effective roaming solution. The present invention realizes the roaming function of the mobile station among the base station systems through the method of call transfer, by setting the call transfer of the mobile station, the roaming paging of the mobile station is automatically completed by the local exchange, which is transparently processed to the base station system, and the mobile station Roaming calls only need to add simple mobile authentication to the mobile station to complete the call according to the normal process.

Fig. 1 is an embodiment of the wireless local telephone system of the present invention, and in this embodiment, the communication system at home includes base station transceiver BTS1, base station controller BSC1, local exchange 1 and roaming manager at home; the communication system at home includes Base transceiver station BTS2, base station controller BSC2, local exchange 2 and visiting site roaming manager; both local exchange 1 and local exchange 2 are connected to a larger local exchange; the mobile station is located in the visiting site communication system. In the embodiment shown in Fig. 1, the realization of roaming mainly has two parts: the roaming manager and the base station foreground agent module (not shown in the figure) that manage the position information of the mobile station; the roaming manager is responsible for managing the mobile information of the mobile station , the home roaming manager and the visiting roaming manager are connected through Ethernet, so that each roaming manager can communicate with each other; Information, transfer the mobile station registration message, call-up message and paging message from the service process to the roaming manager, and forward the mobile information and call transfer setting request sent by the roaming manager to the service process.

The roaming realization method of the present invention makes full use of the call transfer function of the local exchange. When the mobile station performs roaming registration, the visited base station system 2 notifies the home base station system 1 to set call forwarding on the home local exchange 1, and the transferred target number belongs to the number range of the visited local exchange 2. When the mobile station is paged by roaming, the local switch 1 at the home location automatically transfers the paging to the local switch 2 at the visited location, and then the local switch 2 at the visited location completes the paging according to the normal paging process. During this process, the base station does not participate in the implementation of roaming paging, and roaming paging is the most complicated and difficult part of completing the roaming function on the base station side. Through the present invention, the base station system realizes the transparent processing of mobile station roaming .

The service process mentioned in this embodiment refers to the foreground process in the wireless local telephone system that completes the mobile station calling and paging processes.

In the schematic diagram of the roaming registration process of the mobile station shown in Figure 2, this process involves the roaming manager of the visited site, the base station controller BSC2 of the visited site, the local exchange LE1 of the home site, the base station controller BSC1 of the home site, and the home site ground roaming manager. Its specific implementation process is:

a. The roaming mobile station initiates a roaming registration request to the visited base station controller BSC2;

b. The visited base station controller BSC2 initiates registration authentication to the visited roaming manager; the visited roaming manager assigns a roaming temporary number to the roaming mobile station, and sends a roaming registration notification to the home roaming manager;

c The home roaming manager retains the roaming information of the mobile station, and sends the temporary number of the roaming mobile station to the home base station controller BSC1; after receiving the temporary number, the home base station controller BSC1 sets up the roaming through the home local exchange LE1 The mobile station calls are transferred to the roaming temporary number;

d. The home roaming manager sends a roaming registration response to the visiting roaming manager; the visiting roaming manager then sends a roaming registration authentication reply to the visiting base station controller BSC2; finally the visiting base station controller BSC2 sends a roaming mobile station a roaming registration response. Registration response.

Through the above steps, the roaming registration process of the mobile station can be completed.

FIG. 3 is a schematic diagram of the call flow of the mobile station as the final call, that is, the roaming paging process of the mobile station. This process involves the roaming manager of the visited place, the base station controller BSC2 of the visited place, the local exchange LE2 of the visited place and the local exchange LE1 of the home place in the wireless local telephone system. The specific implementation process is:

a. After receiving the paging request for the roaming mobile station, the home local exchange LE1 converts the paging request into a paging request for the temporary number of the roaming mobile station, and sends it to the visiting local exchange LE2;

b. After receiving the paging request for the temporary number of the roaming mobile station, the visited local exchange LE2 initiates a paging request to the visited base station controller BSC2;

c. The visited base station controller BSC2 obtains the original information of the roaming mobile station after being authenticated by the visited roaming manager, and completes the rest of the paging process.

Fig. 4 is a schematic diagram of the calling process of a roaming mobile station as an originating call, which involves the roaming manager of the visited location, the base station controller BSC2 of the visited location and the local exchange LE2 of the visited location in the wireless local telephone system. The specific implementation process is:

a The roaming mobile station initiates a roaming call request to the visited base station controller BSC2;

b. The visited base station controller BSC2 initiates an authentication request to the visited roaming manager; after passing the authentication, the visited base station controller BSC2 completes the subsequent call process.

In the present invention, the temporary number for call forwarding is dynamically assigned by the visited base station controller BSC2. When establishing the system, a number is reserved on the local exchange side for call forwarding, and about 30,000 users reserve 1,000 roaming number resources. For the processing of billing, the call record of the roaming mobile station is kept by the roaming manager, and submitted to the billing center according to the format requirements of the billing center; a fixed number can also be assigned to the mobile station at the visiting place, and the The combination of multiple numbers of a mobile station is the final charge of the mobile station.

Claims (7)

1. A wireless local telephone system, comprising a home communication system and at least one visiting communication system, the home communication system and the visiting communication system both include a base transceiver station, a base station controller, a local exchange and a roaming manager; Wherein the base transceiver station, the base station controller, and the local exchange form a common wireless access system, and the roaming manager is connected with the base station controller, and controls the base station controller to complete the call transfer instruction; The roaming manager in the home communication system is connected to the roaming manager in the visiting communication system through Ethernet. 2. A method for roaming in a wireless local telephone system, comprising the following steps: 1. When the mobile station performs roaming registration, the visited base station system notifies the home base station system to set call forwarding on the home local exchange, and the transferred target number belongs to the number range of the visited local exchange; 2. When the mobile station is paged by roaming, the local exchange at home automatically transfers the paging to the local exchange at the visiting site according to the set call forwarding number, and the local exchange at the visiting site completes the paging process according to the normal paging process. call. 3. The method for realizing roaming in the wireless local telephone system according to claim 2, characterized in that said step one, the roaming registration process of the mobile station, specifically includes the following steps: 1. The visited base station controller receives the roaming registration request from the mobile station; 2. The base station controller of the visited place notifies the roaming manager of the visited place of the roaming registration request; 3. The roaming manager of the visited location notifies the roaming manager of the home location of the mobile station of the mobile station's request for roaming registration; 4. The home roaming manager notifies the home base station controller to set the call forwarding to a number of the visited base station system to the home exchange, and retains the location information of the mobile station; 5. The home roaming manager completes the authentication response to the visited roaming manager; 6. The visited roaming manager retains the subscription information of the mobile station. 4. The roaming method of wireless local telephone system according to claim 3, characterized in that before said step 3, it also includes the step of assigning a roaming temporary number to the mobile station by the visited roaming manager. 5. The method for roaming in a wireless local telephone system according to claim 3, wherein said step 4 specifically comprises: 1) the home roaming manager sends the temporary number of the roaming mobile station to the home base station controller; 2) The home base station controller sets the mobile station call forwarding to the roaming temporary number through the home local exchange. 6. The roaming method of the wireless local telephone system according to claim 2, characterized in that, said step 2, the roaming paging process of the mobile station, specifically includes the following steps: 1. The home exchange receives the paging request from the mobile station; 2. The home local exchange transfers the paging request to the visited local exchange; 3. The local exchange at the visited place sends the paging request to the base station controller at the visited place; 4. The visited base station controller requests the visited roaming manager to authenticate the roaming mobile station; 5. After the authentication is completed, the visited base station controller completes the subsequent paging process. 7. The method for realizing roaming in the wireless local telephone system according to claim 2, characterized in that it also includes a process of invoking a mobile station roaming call, and the specific steps are: 1. The mobile station initiates a roaming call request to the visited base station controller; 2. The visited base station controller requests the visited roaming manager to authenticate the mobile station; 3. After passing the authentication, the visited base station controller completes the subsequent call process.

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