WO2006122482A1

WO2006122482A1 - A method of roaming restriction

Info

Publication number: WO2006122482A1
Application number: PCT/CN2006/000944
Authority: WO
Inventors: Shengqiang Yang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-05-17
Filing date: 2006-05-11
Publication date: 2006-11-23
Also published as: CN1867160A; CN100377619C; MX2007008126A

Abstract

A method of roaming restriction is provided, which includes: uniformly designing cell access restriction identification in the whole network, and configuring roaming restriction identification for mobile station; obtaining the cell access restriction identification and the mobile station identification according to the initial message of mobile station; judging whether the configured roaming restriction identification corresponded by the mobile station and the cell access restriction identification of the active cell are associated, if yes, then continuing the subsequent process; otherwise releasing this call. According to present invention, it is possible to realize the roaming management of mobile station just by configuring SID and/or NID of local network for the mobile station. Furthermore, when the mobile station locates in the overlay area of two or more territory area, it can improve the voice quality in overlay area by effectively utilizing CDMA soft handoff technique. Furthermore, the roaming restriction method of present invention does not perform roaming restriction to special number, such as fire alarm 119, bandit alarm 120, thereby, considering the common benefit of society farthest.

Description

Roaming restriction method

Technical field

The present invention relates to the field of mobile communication technologies, and in particular to a roaming management method for mobile users. Background technique

In mobile communication systems, roaming restrictions limit the range of mobile user roaming to a particular area. It is part of mobility management and plays a role in the location update process. Generally, there are two ways to implement it: The first is "operator-determined blocking" related to roaming, the operator is called "Obed Determined Barring"; the second is "regional signing", their mode of action, function Timing, and execution limits vary by network entity.

Based on their contract with the mobile network operator, the mobile subscriber can access the specific coverage area that has been contracted and obtain the contracted service provided by the operator.

In a Code Division Multiple Access (CDMA) Wireless Local Loop (WLL) system, the fixed network operator deploying the system differs from tariffs, policies, mobile licenses, fixed and mobile networks. The consideration of factors such as competition and competition has led to the need to limit roaming. Roaming restriction refers to limiting the roaming range of a mobile station. Therefore, for operators, roaming restrictions are an urgent problem to be solved.

In the prior art, a roaming restriction can be implemented by using a cell roaming group. In this technique, a number of different roaming groups are pre-set in the CDMA WLL. When the mobile station opens an account, the mobile station can be configured in a different roaming group. When the mobile station requests the service access, the system determines whether to limit the service access of the user in the current cell according to the current cell information reported by the mobile station and the roaming group configured when the mobile station opens the account.

However, the above technique has the following disadvantages:

When the network status changes, such as upgrade capacity expansion and network optimization, the cell will be adjusted. At this time, the office needs to re-adjust the roaming group configuration, and sometimes it needs to modify the roaming group it is in for the user. Therefore, the network upgrade and expansion operations are complicated, which is not conducive to network changes.

When the network size is large, since the roaming limit of the cell roaming group mode limits the amount of data, As a result, the configuration is more complicated and the system matching workload is also large.

For mobile stations that are in the overlapping area of the cell boundary, since the roaming is restricted according to the access cell, the time-breaking phenomenon may occur.

Another prior art is a roaming restriction scheme based on a preferred roaming list (PRL). The basic idea of the scheme is that the CDMA WLL system uses the function of the OTAP A (Over the Air Parameter Administration) to the terminal. The stored PRL is controlled. The network identification (NID, Network Identification) of the CDMA WLL system can be configured to the cell level, that is, each cell in a base station (BTS) can correspond to a unique NID. The CDMA WLL system modifies the system identification (SID, System Identification)/NID group in the terminal PRL through the OTAPA process, so that the SID/NID stored in the terminal is only the same as the SID/NID corresponding to a certain cell.

After the user terminal is powered on, the system first performs system detection, and then searches for the pilot signal of each cell in the frequency setting point of the terminal, and after capturing a certain pilot signal on the frequency point, the terminal starts to accept the synchronization channel delivered by the cell. The message carries the SID/NID corresponding to the BTS cell; the terminal can search for the network in the cell corresponding to the SID/NID group in the PRL, and the terminal locks the network, and then reports the channel through the air interface on the network. Messages such as location registration, initial call, and paging response are processed. In this way, the terminal can ensure that the terminal uses the service in the cell corresponding to the SID/NID registered when the account is opened.

However, the above prior art has the following disadvantages:

For users in the cell border overlap area, due to external cell interference, there is often an inability to lock or lock errors, and the call quality cannot be guaranteed.

The roaming restriction scheme limits all services, including emergency calls, voice services, supplementary services, circuit type data services, packet data services, and short messages. The emergency call is also restricted because the terminal cannot access the network using the restricted area, and the emergency call cannot be called out. Summary of the invention

In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a roaming restriction method, which is configured to improve the quality of a call in an overlapping area of a regional network, and also solves the problem of limitation on a special number. A roaming restriction method provided by the present invention includes:

A. Unifiedly plan the cell access restriction identifier on the entire network, and configure a roaming restriction identifier for the mobile station;

B. Obtain a cell access restriction identifier and a mobile station identifier of the activated cell according to the mobile station initial call message;

C. It is determined whether the configured roaming restriction identifier corresponding to the mobile station identifier and the cell access restriction identifier of the activated cell are associated, and if the association is performed, the subsequent process is continued; otherwise, the call is released.

The cell access restriction identifier is a system identification SID, a network identification NID or / and a location area code or a user-defined location area code. The cell access restriction identifier belongs to an attribute of the cell, and must be configured when the cell is configured.

The step B described further includes:

Obtaining an active set cell list and a mobile station identifier according to the initial call message;

Obtaining a cell access restriction identifier of each activated cell according to the active set cell list; obtaining the mobile station roaming restriction identifier according to the mobile station identifier.

The step B described further includes:

Obtaining the area code of the mobile station according to the mobile station identifier;

The mobile station roaming restriction identifier is obtained according to the area code of the mobile station.

The step C further includes:

Comparing each cell access restriction identifier with the roaming restriction identifier of the mobile station respectively, if all the cell access restriction identifiers are not equal to the roaming restriction identifier of the mobile station, performing roaming restriction, ending the current call, otherwise, continuing the call Second call.

The cell access restriction identifier is uniformly planned on the entire network, where each region uses the same cell access restriction identifier, and each region includes at least one cell.

The mobile station roaming restriction identifier is configured according to the roaming restriction at the time of signing. Interconnected between the wireless access controllers RAC of the two local networks through the A3/A7 interface. As described above, the method of the present invention, when planning the entire network, only needs to configure the home SID and/or NID of the local network when the mobile station opens an account, so the configuration of the present invention is simple. In addition, when the mobile station is in the overlapping area of two or more regional networks, due to When switching, the macro diversity of the terminal access is used for processing, so that the CDMA soft handover technology can be effectively utilized to improve the call quality of the overlapping area, and the user roaming range can be minimized. Furthermore, the roaming restriction method of the present invention may not limit roaming for special numbers, such as fire alarm 119, police alarm 120, etc., so that social public interest can be considered to the greatest extent. DRAWINGS

Figure 1 is a schematic diagram showing the division between a region and a cell of the present invention;

Figure 2 shows a schematic diagram of the roaming restriction of the present invention. detailed description

In order to facilitate a person skilled in the art to understand and practice the invention, embodiments of the invention are now described in conjunction with the drawings.

In order to implement the present invention, it is first necessary to uniformly plan a cell access restriction identifier on the entire network, and each regional network uses the same cell access restriction identifier, and each regional network includes at least one cell. The cell access restriction identifier is SID and/or NID, Location Area Code (LAC), or a custom location area code. Specifically, in the entire network, each regional network corresponds to a specific cell access restriction identifier, and different regional networks correspond to different cell access restriction identifiers.

As shown in Figure 1, the following rules are adopted for the planning mode: The value of the SID corresponds to each regional network. The NID can take any value, for example, the value is 65535. Among them, all the cells of the regional network 1 have a SID of 1, and the NID is 65535; all the cells of the regional network 2 have a SID of 2 and a NID of 65535. Specifically, in the entire network, different SID values represent different regional networks, and the same SID value represents the same regional network, and each regional network includes multiple cells.

In Figure 1, only the SID is used to represent the regional network. It should be noted that other methods can be used to plan the entire network. For example, the value of the NID can be used to represent the regional network, that is, in the entire network, different NID values represent different regional networks, and the same NID value represents the same regional network. Or the LAC value is used to represent the regional network. That is, in the entire network, different LAC values represent different regional networks, and the same LAC value represents the same regional network. Or use a user-defined location area code to represent the regional network, that is, in the entire network, different custom location area codes represent different regional networks, and the same custom location area code represents the same regional network. . Secondly, the mobile station modifies the subscription roaming restriction when or after the account is opened, and configures its roaming restriction identifier according to the contracted roaming restriction, and all mobile stations belonging to a regional network need to identify their roaming restriction identifier. The purpose of the contracted roaming restriction for the mobile station is to stipulate that it can implement roaming in a certain regional network. When the mobile station is configured with the roaming restriction identifier, it indicates that the mobile station can be in the regional network of the roaming restriction identifier. Roaming is achieved, and roaming cannot be achieved in other regional networks. As shown in FIG. 1, the roaming restriction identifier SID=1 in all mobile station account opening information in the regional network 1, and the mobile station whose roaming restriction identifier SID=1 can implement roaming in the regional network 1; all mobile stations in the regional network 2 The roaming restriction identifier SID=2 in the account opening information, and the mobile station whose roaming restriction identifier SID=2 can implement roaming in the regional network 2.

For convenience of description, the cell access restriction flag will be represented by SID and/or NID as an example.

The roaming restriction method of the present invention will be described below. The basic idea of the roaming restriction method of the present invention is: the mobile station terminal reports the list of each active set cell and the signal strength when accessing or switching, and the network side takes out the SID and/or NID of each active set (Active Set) cell, and judges the report. Whether the SID of the cell in the active set cell list is equal to the SID in the user configuration information, if yes, the call is allowed to be connected, otherwise, the access is denied. The roaming restriction method of the present invention in a voice caller flow will be described in detail below with reference to FIG.

As shown in FIG. 2, in step 201, the mobile station sends an originating call message to the base station, where the initial call message carries the active cell list and the mobile station identity.

In step 202, the base station receives the start message and sends a connection service request message to the radio access controller according to the start message, where the connection service request message carries the activated cell list and the mobile station identifier.

In step 203, the radio access controller receives the connection service request message, and extracts the activation d, the area list, and the mobile station identifier carried in the message, and extracts the cell SID corresponding to each cell according to the area list from the configuration. And/or NID, obtaining the mobile station based on the mobile station identity

SID and / or NID. Then, the cell SID and/or the NID are matched with the SID and/or the NID configured by the user. If all the SIDs and/or NIDs of the cell are not equal to the SID and/or NID configured by the user, the roaming restriction is performed, and the current release is performed. Call; otherwise, do not restrict roaming and continue the follow-up process.

According to the mobile station identification, the SID and/or ID of the mobile station can be obtained, and there are various methods. For example, an association table of the mobile station identifier and its SID and/or NID may be set in the radio access controller, and the SID and/or ID may be obtained by querying the association table according to the mobile station identifier; or directly at the mobile station. The SID and/or NID is set in the attribute table, and its SID and/or NID is obtained by querying its attribute according to the mobile station identity.

In step 204, a link establishment is carried out between the radio access controller and the local exchange through the V5 interface. In step 205, the radio access controller sends an assignment request message to the base station. In step 206, an air interface service path is established between the base station and the mobile station. In step 207, the base station sends an assignment completion message to the radio access controller. In step 208, the wireless access controller simulates the mobile station dialing the called number to the local exchange over the V5 link. In step 209, the local exchange sends a ringback tone to the mobile station based on the condition of the mobile station dialing the called number. If the called number mobile station is busy, the local exchange sends a busy ring back tone to the calling mobile station.

According to the present invention, preferably, when planning the cell access restriction identifier, the cell access restriction identifier may be associated with the area code of each regional network, for example, Guangzhou 020 corresponds to 1/65535, and Shenzhen 0755 corresponds to 2/65535. At this time, the base station After receiving the initial call message of the mobile station, the system may extract the identifier of the mobile station and the active set cell according to the original call message, detect the corresponding user's telephone area code by using the mobile station identifier, and obtain the user's roaming restriction identifier by using the area code query association table. The roaming restriction identifier of the user is compared with the cell access restriction flag corresponding to the active set cell, and if there is the same, the call is allowed, otherwise, the roaming restriction is performed. In this way, the mobile station identity is associated with the cell access restriction identity, and the base station system can achieve regional level roaming restrictions without any configuration of the user data. There is no need to make any configuration changes when expanding the base station in the future.

In a mobile communication system, a standard A3/A7 interface is usually provided between the base station controllers and the BSCs for implementing soft handover between BSCs. The A3 interface is used for service data between the base station controllers BSC, and the A7 interface is used for transmitting signaling between the base station controllers BSC to support soft handover between BSCs. The A3/A7 interface is the interface between the A3 and A7. In the present invention, in order to improve the call quality of the overlapping areas of the two local networks, the radio access controllers (RACs, Radio Access Controllers) in the two local networks are interconnected through the A3/A7 interface.

Therefore, according to the present invention, after the entire network is planned, it is only necessary to configure the area code or SID and/or NID of the local network when the mobile station is opened, so that the configuration of the present invention is simple.

In addition, when the mobile station is in the overlapping area of two or more regional networks, due to access Time and handover are handled by macro diversity of terminal access, which can effectively utilize CDMA soft handover technology to improve call quality in overlapping areas, and to limit user roaming range to the greatest extent.

In addition, the method of the present invention may not impose roaming restrictions on special numbers, such as fire alarm 119, police 120, etc., so that the public interest can be considered to the greatest extent.

While the invention has been described by the embodiments of the present invention, it will be understood by those skilled in the art The claims are limited.

Claims

Rights request

A roaming restriction method, comprising:

B. The cell access restriction identifier and the mobile station identifier of the activated cell are obtained according to the mobile station initial call message;

The roaming restriction method according to claim 1, wherein the cell access restriction identifier is a system identifier SID, a network identifier NID or/and a location area code or a user-defined location area code.

The roaming restriction method according to claim 1 or 2, wherein the step B further comprises:

Obtaining a cell access restriction identifier of each activated cell according to the active set cell list; obtaining the mobile station roaming restriction identifier according to the mobile station identity.

The roaming restriction method according to claim 3, wherein the step B further comprises:

The roaming restriction method according to claim 1 or 2, wherein the step C further comprises:

The roaming restriction method according to claim 1, 2 or 3, wherein the cell access restriction identifier is uniformly planned on the entire network, wherein each region uses the same cell access restriction identifier, and each region includes at least a community.

The roaming restriction method according to claim 6, wherein the mobile station roaming restriction identifier is configured according to a roaming restriction at the time of signing.

8. The roaming restriction method according to claim 1, wherein the interconnection is performed between the radio access controllers RAC of the two local networks through the A3/A7 interface.