KR970011680B1 - Method for tracking a subscriber position in cellular system - Google Patents

Abstract

The method is for tracing position of a subscriber in a cellular system. According to the tracing method, when a subscriber is at an area adjacent to plural exchange stations after registration of the subscriber, the subscriber requests a position registration with reference to the distance by a unit of a zone to a station. Thereafter, the station transmits an inherent zone information thereof to the plural exchanger stations and requests a position registration thereof. The exchange station that receives the position registration request confirms whether or not several exchange stations exist within a registration distance by using an earth configuration database.

Description

Subscriber Location in Cellular System

1 is a network diagram of a typical cellular system.

2 is an exemplary diagram for explaining a multi-MX registration environment generated when a mobile station registers a location.

3 is a flowchart illustrating an operation of registering a location according to the present invention.

4 is an operation flowchart for explaining a routing scheme according to the present invention.

The present invention relates to a method for managing subscriber location information in a cellular system, and more particularly, to a method for tracking a subscriber location in a cellular system for reducing the load on a system required for searching a cell area in which a subscriber is located.

In general, the network diagram of a cellular system includes a subscriber location registration database (HLR) that permanently stores subscriber location information, as shown in FIG. It contains a database (MSC / VLR) that stores temporary location information.

Since the VLR manages a mobile station in zone units, the VLR receives a registration request from the mobile station and performs location registration for the subscriber as being in a specific zone.

In the cellular system having the above configuration, the position of the mobile station moving the cell should be checked from time to time to prepare for a call. Inevitably, the load of the system for checking the position of the mobile station is inevitably increased.

As a conventional method for reducing the location registration load in the wireless section, Qulacomm, which proposes the US CDMA digital cellular system standard specification, has registered a distance-based location registration method as a patent.

In the case of using the distance-based location registration method, which is one of the location registration methods proposed by ELA / TLA IS-95, which is a standard of the US CDMA digital cellular system standard, the mobile station compares the location information each time the cell moves (at the registration point). Compare the distance between the cell and the current cell, and if the value moves a certain distance (Dr: registration distance), the mobile station performs location registration. This has the advantage of distributing the registration load to each cell while reducing the frequency of location registration per cell.

However, this is a question of how to handle paging.

The mobile station is on standby after powering on to perform power on registration.

Without making a call, the mobile station moves between base stations.

At this time, the location information (latitude, longitude, distance of registration) of the region registered by the user is first inputted to the temporary memory device, and then moved to the adjacent cell. If registration is over the registration distance range, location registration is performed.

The subscriber location management load is increased because the VLR needs to manage the location information of the mobile station by cell, not zone. If the mobile station is terminated call 1, the VLR finds the last cell registered by the calling party, calculates the cells within the registration distance range based on the cell, and sends a paging request message to the base station controller that manages the cells. Will be sent.

This results in a variable number of base station controllers that must be paged in one paging and increases the load required per page. The problem arises that the procedure for paging at the system boundary area where several MXs coexist around the registered cell is complicated.

This requires paging to multiple MXs at the same time, which makes it difficult to implement without changing the signal protocol of the existing EIA / TIA IS-41.

In addition, referring to the attached FIG. 2, a subscriber requesting registration at the border area is provided with a paging zone over three exchanges, but the conventional method does not mention how to handle it. The problem is that it can't be done.

An object of the present invention to solve the above problems is to provide a subscriber location tracking method in a cellular system to reduce the load on the system required to search the cell area in which the subscriber is located.

A feature of the present invention for achieving the above object is, in the location registration method for subscriber location tracking in a cellular system, the subscriber is a base station when the multiple exchanges enter the adjacent area by moving the registration reference distance after registration A first process of requesting zone-based distance-based location registration to the base station, a first process of requesting zone-based distance-based location registration to the base station, and the base station requesting a location registration while sending its zone unique information to the exchange The exchange receiving the location registration request in the second step and the second step is performed by the exchange included in the registration distance based on the corresponding respect system using the terrain database storing the neighbor zone list of the zone to which the subscriber belongs. A third process of checking whether there are several and storing the information checked in the third process Including the fourth process.

Another feature of the present invention for achieving the above object is a routing method for subscriber location tracking in a cellular system, wherein the exchange receiving a mobile station incoming signal from a general public telecommunication network or another network is connected to a subscriber location data storage means for a called party. A first step of requesting routing information, the subscriber location data storing means is a second step of requesting routing to exchanges associated with the called party, and the exchange receiving the routing request in the second step is based on zone specific information. A third process of paging to a predetermined distance paging area, a fourth process of transferring routing information to the subscriber position data storage means when the switch receives the response according to the third process, and the subscriber position data storage means Transmitting routing information received from the routing information received through the fourth process; The fifth step and the incoming call receiving exchange include a sixth step of receiving routing information from the subscriber location data storing means and routing the call to the relevant exchange.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

When the location registration method is changed, the paging method is also changed, because the location registration and paging method are not operated separately but are closely related to each other. In the proposed method, paging to multiple MXs is performed for subscriber location tracking.

Briefly describing the location registration method according to the present invention, when a subscriber moves to a registration reference distance after registration, and the multiple exchanges enter an adjacent area, the subscriber requests the BS to register the location reference based on the distance unit.

The BS sends its zone-ID information to the switch (MSC / VLR) and requests location registration, and the switch (MSC / VLR) receiving the terrain data stores the neighbor zone list of the zone to which the subscriber belongs. Using the base, it checks whether there are several exchangers included in the registration distance Dr based on the respected system, and sends information about this to the HLR, which stores the information.

That is, referring to the attached FIG. 3, first, the VLR performs location information management in units of zones, and when the mobile station moves the registration distance Dr, location registration is performed (Zone-ID). Assume that the system is configured to send a Location Updte message to the VLR.

When a mobile station having entered several contiguous exchanges requests a BS to register a location, the BS sends a Location Up date message (1) including its zone-ID to the exchange (MX / VLR).

At this time, the exchange uses the adjacent zone designation database (see tables 1a and 1b below).

TABLE 1a

TABLE 1b

It finds the zone-ID requesting registration and sends a Location Notification message (2) to the HLR, which contains information about the paging area across the multiple exchanges.

The HLR stores the location update information (see table (2) below),

TABLE 2

* Note) The MSRN is allocated only when there is a paging area in one exchange.

A Location Natifaction ACK message 3 is sent to the exchange, and the exchange requesting registration receives it and completes the location registration for the subscriber.

If the adjacent zones are in a single exchange, a location update message does not go up to the HLR, but a location update occurs only in the VLR.

The field structure of the location update message is shown in the following tables (3a, 3b).

Table 3a

TABLE 3b

Briefly describing the routing scheme according to the present invention, the exchange receiving the mobile station incoming signal from the PSTN or the other network requests the HLR for routing information for the called subscriber and the HLR requests routing to the exchanges associated with this subscriber.

The exchange receiving the routing request paging the paging area at a certain distance based on the zone-ID, and the receiving exchange sends the routing information (MSRN) to the HLR.

The HLR sends this routing information to the incoming exchange. The incoming call receiving exchange also receives routing information from the HLR and routes the call to the relevant exchange.

That is, referring to the attached FIG. 4, the exchange receiving the mobile terminated call from the PSTN or other network (Gateway function execution) sends a subscriber location request message (1) to the HLR. Request routing information about the called subscriber.

Upon receiving this message, the HLR sends a Routing Request message (2) to each exchange to which the called party belongs.

Each exchange receiving this message accesses the adjacent zone specific database in the exchange based on the MSCID and Zone-ID field values of the Routiog Request message sent by the HLR.

If the subscriber's registration exchanger is himself / herself, he accesses the database as shown in the above table (1a), and if he is a subscriber registered at another exchange, he accesses the database as shown in the table (1b).

As a result of accessing through the above process, zones belonging to the paging area are found and paged to the base station controllers that manage the zones. Upon receiving this, the base station controller sends a page message to the cells belonging to the base station controller. The base station receiving this page to the subscriber.

Receiving its paging message, the subscriber sends a page response message to the exchange via the base station. The exchange receiving the response to paging sends a routing request response message (3) to the HLR, and the HLR sends a location request response (4) message to the exchange requesting routing information, indicating that the mobile station serving exchange (the exchange whose mobile station has responded to paging) To root.

The structure of each message field is shown in the following table (4a, 4b).

TABLE 4a

TABLE 4b

Providing the subscriber location tracking method in the cellular system according to the present invention operating as described above, since the paging load does not occur in the respect system, the subscriber location tracking uncertainty due to the zone change is reduced, the registration load is distributed throughout the cells using the radio channel It seems to be effective.

In addition, the location area management of the VLR may be simpler than the cell location area management.

In addition, since the physical zone area remains as it is, there is no confusion with the zone used for registration in the subscriber registration location.

In addition, the existing zone-based location registration method requires paging in multiple zones, so in certain environments (highway, etc.), the bandwidth of the control channel used in the wireless section will be smaller than in the zone-based location registration method.

The proposed method has the effect of reducing the required bandwidth of the radio control channel. In the case of uniform distribution of vehicles, the proposed method of occupying the radio bandwidth per unit cell is slightly better, but it is expected that the efficiency of the radio control channel band is higher in the highway.

In addition, there is an advantage that the subscriber location uncertainty can be given while moving the zone.

Within the tolerance of the MSC signaling processing capability of the base station controller, using the distance-based location registration method can reduce the load of the radio control channel, and there is a problem in the signaling processing capacity of the base station controller and the MSC. It is desirable to handle the registration / rooting function.

Claims (2)

In the location registration method for subscriber location tracking in a cellular system, when a subscriber enters an adjacent area by moving the registration reference distance after registering, the subscriber requests the base station to register the location based on the distance based on the distance. 1 course; A second step of making a location registration request by sending its zone unique information to the base station to the base station; The exchange receiving the location registration request in the second process checks whether there are several exchanges included in the registration distance based on the corresponding respect system using the terrain database storing the neighbor zone list of the zone to which the subscriber belongs. The third process of doing; And a fourth process of storing the information identified in the third process. In a routing method for subscriber location tracking in a cellular system, the exchange receiving a mobile station incoming signal from a general public telecommunication network or another network requires a first step of requesting routing information for the called party from the subscriber location data storage means and the subscriber location. The data storage means includes a second step of requesting routing to exchanges associated with the called party; The exchange receiving the routing request in the second process, paging a predetermined distance paging area based on zone specific information; A fourth step of transmitting routing information to the subscriber location data storage means when the switch receives the response according to the third step; The subscriber location data storing means may further include a fifth step of transmitting the incoming call receiving switch to the routing information received through the fourth step; And a sixth step of receiving the routing information from the subscriber location data storing means and routing the call to an associated exchange.