KR20010059572A - Novel method of location registration and paging using distance-based boundary location area with boundary location register in heterogeneous mobile communication system - Google Patents

Abstract

PURPOSE: A location registering and paging method using a boundary location area and a boundary location register is provided so that location management can be efficiently performed by reducing signal traffics resulting from terminals passing through a boundary region between cells or location areas. CONSTITUTION: A mobile terminal examines LA ID information in a broadcast message(501), and detects variation of an LA ID(502). When the LA ID is varied, the mobile terminal transmits a location renewal message(503). When the varied LA ID is a home system LA ID, the mobile terminal takes a location renewal procedure in a visitor location register(504,505). The varied LA ID information is renewed in a home location register. When the varied LA ID is a boundary location area, the boundary location register renews terminal location information in the home location register, and receives terminal subscription information(504,506). When the varied LA ID is a visitor system LA ID, the visitor location register requests the terminal location information to the boundary location register, and the boundary location register stores a new LA ID(504,507). Here, when the LA ID is varied in a visitor system, the visitor location register requests the terminal subscription information to the boundary location register, and renews the location information(508-511).

Description

Novel method of location registration and paging using distance-based boundary location area with boundary location register in heterogeneous mobile communication system

The present invention provides a wireless subscriber network (WLL), a broadband wireless subscriber network (B-WLL), a radio frequency system (TRS), a cell phone network (Cellullar), a personal mobile communication network (PCS), and an intelligent transportation network using different mobile communication protocols. (ITS), wireless data networks, other mobile telephone networks in foreign countries, "International Mobile Telecommunication-2000" (IMTS-2000) and "Universal Mobile Telecommunication Service" (UMTS), which are currently being standardized in northern and European ways. In a system in which heterogeneous wireless communication systems such as next-generation mobile communication networks are interworked, a distance-based boundary location area (BLA) and a boundary location register (BLR) in a boundary area between cells adjacent to each other are used. A location registration and paging method and a computer readable recording medium having recorded thereon a program for realizing the method. That is, the present invention relates to a location management technique, such as location registration and paging, to transfer a call by tracking and grasping the location of a mobile terminal in a mobile communication system.

Up to now, the technology of this field has been researched and developed mainly on the location management technique in the structure of one system or the cell of the same layer, and the technology for efficient location management in various hierarchical or mixed systems is insufficient research and development. to be.

1 is an explanatory diagram illustrating a location update and paging method in a boundary area between cells of the same mobile communication system according to the related art. In the drawings, "11, 15, 16" represents a mobile switching center (MSC), and "12, 14" Visitor Location Register (VLR) and "13" represent Home Location Register (HLR) respectively.

The location information of the mobile terminal is managed by the home location register 13 and the visitor location registers 12 and 14.

The visitor location registers 12 and 14 store current location information of the mobile terminal up to a cell unit, and the home location register 13 stores subscriber information of the mobile terminal and location information of each location area unit. Here, the location area is generally set to a set of cells which are location managed by one visitor location register 12,14.

If the cell to which the mobile terminal belongs is changed, the mobile terminal transmits a location update message to the corresponding visitor location registers 12 and 14, and the visitor location registers 12 and 14 store it and receive an incoming call to the mobile terminal. When it occurs, it calls the mobile terminal.

On the other hand, when the mobile terminal first registers with the visitor location registers 12 and 14, it contacts the home location register 13 to authenticate the mobile terminal and extracts subscription information. At this time, the home location register 13 stores the location information of the mobile terminal at the location area level.

Then, when the location area is not changed and only the cell is changed, the visitor location registers 12 and 14 store only in the visitor location registers 12 and 14 without exchanging a location update message with the home location register 13. Only cell information is updated. However, if a change occurs in the location area to which the mobile terminal belongs, the mobile terminal performs a location update to the visitor location registers 12 and 14 through the newly belonging cell. At this time, the visitor location registers 12 and 14 inquire authentication information and subscription information about the mobile terminal to the home location register 13, and the home location register 13 stores the location information of the mobile terminal before the previous visitor location. Instructs the registers 12 and 14 to delete the location information for the mobile terminal.

On the other hand, when an incoming call to the mobile terminal occurs, the switching center c (16) inquires the location information on the mobile terminal to the home location register (13), where the home location register (13) in accordance with the stored location information of the mobile terminal Instruct the visitor location registers 12 and 14 to pass routing numbers. Thereafter, the visitor location registers 12 and 14 instruct the call of the mobile terminal to the cell according to the stored location information of the mobile terminal, and the call is initiated when the mobile terminal responds.

FIG. 2 is an explanatory diagram showing a location update and paging method in a boundary area between cells of a conventional heterogeneous mobile communication system, in which "21" denotes a switching center a (MSC-a) and "22" denotes a visitor location register (VLR) of a home network. -h), "23" is the switching center c (MSC-c), "24" is the home location register (HLR-h) of the home network, "25" is the visitor location register (VLR-v), "26" in the visiting network. Are the switching center b (MSC-b), and " 27 " represent the home location register (HLR-v) of the visited network, respectively.

Even at the current location update and paging in the intercell boundary area of the heterogeneous system, location update and paging location management for the mobile terminal are performed by the home location registers 24 and 27 and the visitor location registers 22 and 25.

However, in the next generation mobile communication system such as IMT-2000, several different systems may overlap, and a global roaming function for allowing a mobile terminal to receive the same service while moving between heterogeneous systems is an essential requirement. . That is, as shown in Figure 2 may be in contact with the system having a heterogeneous signal system, in this case, the location update and paging is the home location register 24 of the home network, the visitor location register 22 of the home network, The home location register 27 and the visitor location register 25 of the visited network.

Here, the home location register 24 of the home network and the visitor location register 22 of the home network represent the location register of the home system to which the subscriber subscribes, and the home location register 27 of the visited network and the visitor location register 25 of the visited network. ) Denotes the location register of the visiting system. When the mobile terminal is located at the boundary area between these two system location areas, location update and paging for the mobile terminal generates unnecessary signal traffic.

For example, when the mobile terminal roams from the location area LA1 of the home system to the location area LA2 of the visited system, the mobile terminal sends a location update message to the visitor location register 25 of the visited network. The visitor location register 25 of the visited network transmits a signal message to the home location register 27 of the visited network in order to obtain information about the mobile terminal and the subscriber. At this time, since the home location register 27 of the visited network does not have information about the mobile terminal, the home location register 24 of the home network is inquired again, and the home location register 24 of the home network reconfirms the authentication of the subscriber. The subscription information is transmitted to the home location register 27 of the visited network.

Thereafter, the home location register 27 of the visited network that receives the information about the mobile terminal from the home location register 24 of the home network transmits it to the visitor location register 25 of the visited network.

Meanwhile, the home location register 24 of the home network instructs the visitor location register 22 of the previous home network to delete the location information of the mobile terminal after storing the location of the roaming mobile terminal.

As such, when the mobile terminal moves back and forth between the location areas LA1 and LA2 of two systems in the cell boundary region, such signal traffic is repeatedly generated, thus increasing the location management cost for the mobile terminal. Occurs.

However, as described above, in a next generation mobile communication system such as IMT-2000, systems having different network protocols may be mixed and installed. In this case, integrated location management for the terminal is performed to provide roaming in any system area. This requires a technique that minimizes the additional signal costs incurred by location management between different systems. In other words, a method for efficiently reducing such a signal cost is required.

The present invention devised to meet the requirements as described above, in a system in which heterogeneous wireless communication system is interworking, by designing a boundary location area, and roaming effectively through the boundary location register, it is possible To provide a location registration and paging method for solving the additional signal traffic of the network caused by the movement of the terminal in the cell boundary area and the resulting signal cost increase, and a computer-readable recording medium for realizing the method. There is this.

1 is a diagram illustrating a conventional location update and paging method in a boundary area between cells of the same mobile communication system.

2 is a diagram illustrating a location update and paging method in a boundary area between cells of a conventional heterogeneous mobile communication system.

3 is an exemplary configuration diagram of a hardware system for a location registration and paging method using a boundary location area and a boundary location register in a boundary area between cells of a heterogeneous mobile communication system according to the present invention.

4 is a diagram illustrating an embodiment of a distance-based location area technique used in the present invention.

5 is a flowchart illustrating a location registration and paging method using a boundary location area and a boundary location register in a boundary area between cells of a heterogeneous mobile communication system according to the present invention.

* Explanation of symbols for the main parts of the drawings

31 Switching station a (MSC-a) 32: Visitor location register (VLR-h) in the home network

33: switching center c (MSC-c) 34: home position register of the home network (HLR-h)

35: Border Location Register (BLR) 36: Visitor Location Register (VLR-v)

37: switching center b (MSC-b) 38: home location register (HLR-v)

In order to achieve the above object, the present invention provides a location registration and paging method in a boundary area between cells in a system in which heterogeneous mobile communication networks are interworked. Setting a second step; In order to continuously manage the mobility of roaming subscribers in the boundary location area (BLA) and to reduce unnecessary signal traffic, the boundary location capable of supporting all the signaling methods of the heterogeneous mobile communication networks and supporting the subscriber information form of the system A second step having a register (BLR); And a third step of managing location information of the mobile terminal crossing the boundary of the boundary location area BLA and performing paging through the boundary location register BLR.

In addition, the present invention provides a system in which a heterogeneous mobile communication network having a processor is interworked, wherein a boundary location area (BLA) is set in a boundary area between cells according to a distance-based location registration technique; In order to continuously manage the mobility of roaming subscribers in the boundary location area (BLA) and to reduce unnecessary signal traffic, the boundary location capable of supporting all the signaling methods of the heterogeneous mobile communication networks and supporting the subscriber information form of the system Having a register (BLR); And a computer-readable recording medium having recorded thereon a program for realizing a function of managing location information of a mobile terminal crossing the boundary of the border location area BLA and performing paging through the border location register BLR. to provide.

In order to optimize the signal cost for location management in a heterogeneous system boundary region, the present invention sets up a distance-based boundary position region when performing a location update and paging in an intercell boundary region where a heterogeneous system is in contact with each other. By providing a boundary location register for location update and paging, unnecessary signal traffic generated due to a terminal crossing the boundary can be reduced, thereby enabling efficient location management for the terminal.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exemplary configuration diagram of a hardware system for a location registration and paging method using a boundary location area and a boundary location register in a boundary area between cells of a heterogeneous mobile communication system according to the present invention.

The present invention is characterized by setting a boundary location area (BLA) 3a and a border location register (BLR) 35 for location management in a cell boundary area to perform location update and paging. That is, the boundary position region 3a is set at the boundary of the heterogeneous system position region, and the position update and paging in the boundary position region 3a are performed through the boundary position register 35. At this time, the boundary location area 3a supports the signaling methods of both systems, and supports the subscriber information form of both systems.

As described above, the boundary location area 3a is set at the boundary area between cells of the heterogeneous system, and the location update and paging method through the boundary location register 35 in the set boundary location area 3a are as follows.

When the mobile terminal enters the boundary location area 3a from the location area LA-h of the home network, the mobile terminal transmits a location update message to the boundary location area 3a, and the boundary location area 3a is located in the home network. The home location register 34 inquires and stores subscription information for the mobile terminal. At this time, the home location register 34 of the home network sets and stores the location information of the mobile terminal as the boundary location area 3a.

If the mobile terminal moves from the boundary location area 3a to the location area LA-v of the visited network, the mobile terminal transmits a location update message to the visitor location register 36 of the visited network and the visitor location register of the visited network. 36 inquires about the subscription information for the mobile terminal to the boundary location register 35. At this time, the boundary location register 35 transfers it to the visitor location register 36 of the visited network and sets the location information of the mobile terminal as the location area LA-v of the visited network.

On the other hand, when the mobile terminal enters the boundary location area 3a again, the boundary location register 35 deletes the location information of the mobile terminal from the visitor location register 36 of the visited network and replaces the location information of the mobile terminal with the boundary location area ( 3a).

On the other hand, when the mobile terminal moves from the boundary location area 3a to the location area LA-h of the home network again, the mobile terminal transmits a location update message to the visitor location register 32 of the home network and the home location of the home network. The register 34 sets the location information of the mobile terminal to the location area LA-h of the home network and deletes the location information of the mobile terminal from the boundary location register 35.

Through this procedure, the mobile terminal can reduce unnecessary signal traffic between the home location register 34 of the home network and the home location register 38 of the visited network due to repetitive movement in the border area.

When an incoming call to the mobile terminal occurs, the switching center c 33 inquires to the home location register 34 of the home network, and the home location register 34 of the home network is the location information of the mobile terminal as the boundary location area 3a. If the position information for the mobile terminal is inquired to the boundary location register 35, the boundary location register 35 to the visitor location registers (32, 36) according to the location information of the mobile terminal stored in its database. Instructs to hand over the routing number and directs the call to the mobile terminal to set up an incoming call. That is, the boundary location register 35 performs the same role as the home location register (HLR) with respect to the roaming mobile terminal in the position of the visitor location register 36 of the visited network. In this case, the boundary location area 3a may be set according to the distance-based location registration technique to optimize the additional location update cost generated by the boundary location area 3a.

4 is a diagram illustrating an embodiment of a distance-based location area technique used in the present invention.

As shown in Fig. 4, in setting the location area, the location area is set according to the threshold distance d from the boundary instead of the fixed location area. That is, if the distance "d '= (current Cell ID-bound Cell ID) <d" from the boundary area according to the cell identifier (ID) received from the base station, location registration is performed.

5 is a flowchart illustrating a location registration and paging method using a boundary location area and a boundary location register in a boundary area between cells of a heterogeneous mobile communication system according to the present invention.

As shown in FIG. 5, in the heterogeneous mobile communication system according to the present invention, a location registration and paging method using a boundary location area and a boundary location register in a boundary area between cells, the mobile terminal first examines LA ID information in a broadcast message. (501) It is checked whether there is a change in the LA ID (502).

As a result of the check, when the LA ID is changed, when the mobile terminal transmits a location update message (503), if the changed LA ID is the LA ID in the home system, the location update procedure is performed to the visitor location register (VLR). (504,505). At this time, the changed LA ID information is updated in the home location register (HLR).

If the changed LA ID is the border location area BLA, the border location register BLR updates the terminal location information to the home location register HLR and receives the terminal subscription information (504 and 506).

On the other hand, if the changed LA ID is the LA ID of the visiting system, the visitor location register (VLR) requests the terminal location information from the border location register (BLR) and the border location register (BLR) stores the new LA ID (504,507). ). At this time, if the LA ID is changed in the visited system, the edge location register (BLR) requests the terminal subscription information and updates the location information (508 to 511).

In the visiting system, when a change in the LA ID occurs again, if the changed LA ID is the LA ID in the visiting system, the terminal requesting information is requested to the border location register (BLR) and the location information is updated (508 to 511). If the LA ID is a border location area (BLA), the mobile terminal proceeds to step 501 for examining the LA ID information in the broadcast message.

As described above, the present invention can perform efficient location management for a mobile terminal that repeatedly crosses a boundary in a boundary area through a boundary location area BLA and a boundary location register BLR at a boundary of a heterogeneous system. In particular, the BLA configuration can be set dynamically according to the threshold distance d by a distance-based location update technique, thereby optimizing the overall location management cost according to the movement pattern of the terminal or the difference in the cost of each system signal. .

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

As described above, the present invention can reduce the unnecessary signal traffic caused by the terminal crossing the boundary in the boundary region between the cells or between the location area to perform efficient location management for the terminal, thereby reducing the location management cost of the entire terminal This reduces the maintenance costs of the entire system.

Claims (4)

A location registration and paging method in a boundary area between cells in a heterogeneous mobile communication network system, Setting a boundary location area (BLA) in the boundary area between cells according to a distance-based location registration technique; In order to continuously manage the mobility of roaming subscribers in the boundary location area (BLA) and to reduce unnecessary signal traffic, the boundary location capable of supporting all the signaling methods of the heterogeneous mobile communication networks and supporting the subscriber information form of the system A second step having a register (BLR); And A third step of managing location information of the mobile terminal crossing the boundary of the border location area BLA and performing paging through the border location register BLR; A location registration and paging method using a distance-based boundary location area and a boundary location register in a cell-to-cell boundary area of a heterogeneous mobile communication system. The method of claim 1, The setting of the boundary location area BLA may include: In setting up the location area The location area is set according to a predetermined threshold distance d from the boundary instead of the fixed location area, and the distance d 'from the border area is determined by the following equation according to the cell identifier ID received from the base station. A location registration and paging method using a distance-based boundary location area and a boundary location register in a cell-to-cell boundary area of a heterogeneous mobile communication system. d '= (Current Cell ID-Boundary Cell ID) <d The method according to claim 1 or 2, The process of managing the location information of the mobile terminal of the third step, A fourth step of the mobile terminal examining the location area identifier (LA ID) information in the broadcast message and checking whether there is a change in the location area identifier (LA ID); As a result of the inspection of the fourth step, when the change of the location area identifier LA ID occurs, if the changed location area identifier LA ID is the location area identifier LA ID in the home network, the location update is performed by the visitor location register VLR. Performing a procedure and updating the changed location area identifier (LA ID) information to the home location register (HLR); As a result of the inspection of the fourth step, when the change of the location area identifier LA ID occurs, if the changed location area identifier LA ID is the boundary location area BLA, the boundary location register BLR is set to the home location. A sixth step of updating terminal location information to a register (HLR) and receiving terminal subscription information; In the case where the change of the location area identifier LA ID occurs as a result of the inspection in the fourth step, if the changed location area identifier LA ID is the location area identifier LA ID of the visited network, the visitor location register is the boundary location. A seventh step of requesting terminal location information from a register (BLR) and storing a new location area identifier (LA ID) in the border location register (BLR); And After performing the seventh step, when the location area identifier (LA ID) is changed in the visited network, the eighth step of requesting the terminal registration information to the border location register (BLR) and updating the location information; A location registration and paging method using a distance-based boundary location area and a boundary location register in a cell-to-cell boundary area of a heterogeneous mobile communication system. In a system interworking heterogeneous mobile communication network having a processor, Setting a boundary location area (BLA) in a cell-to-cell boundary area according to a distance-based location registration technique; In order to continuously manage the mobility of roaming subscribers in the boundary location area (BLA) and to reduce unnecessary signal traffic, the boundary location capable of supporting all the signaling methods of the heterogeneous mobile communication networks and supporting the subscriber information form of the system Having a register (BLR); And A function of managing location information of a mobile terminal crossing the boundary of the border location area BLA and performing paging through the border location register BLR A computer-readable recording medium having recorded thereon a program for realizing this.