KR20050071952A - Mixed mobile communication system of wcdma network and cdma network having ndss function, and method for location registration of mobile communication terminal in the same - Google Patents

Abstract

The present invention provides a mobile communication system having an NDSS function in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, and a location registration method of a mobile communication terminal.

According to the present invention, in a mobile communication system in which an asynchronous and synchronous mobile communication system is mixed, the home location register receives and stores / manages the preferred mobile communication system information of a mobile terminal subscriber for location registration of a dual band dual mode mobile communication terminal. To; The node B and the base station store / manage the overlapping information with other mobile communication systems in the region where they are located, and if the location registration request is received from the mobile communication terminal, the node B and the base station transmit a location registration request message including the overlapping information. Send each to; The asynchronous and synchronous exchange selects a mobile communication system to perform location registration by receiving subscriber information including preferred mobile communication system information from the asynchronous and synchronous home location register according to the location registration request of the mobile communication terminal.

According to the present invention, the service quality can be improved by inducing the location registration to the mobile communication system registered by the subscriber as the preferred mobile communication system by the NDSS function in the region where the synchronous mobile communication system and the asynchronous mobile communication system overlap.

Description

Mixed mobile communication system of WCDMA network and CDMA network having NDSS function, and method with a mobile communication system having NDS function mixed with asynchronous mobile communication system and synchronous mobile communication system for Location Registration of Mobile Communication Terminal in the Same}

The present invention relates to a mobile communication system and a location registration method of a mobile communication terminal in a mobile communication system, and more particularly, a mobile communication system having an NDSS function in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, and the mobile communication system. The present invention relates to a location registration method of a mobile communication terminal in a system.

With the development of mobile communication technology, mobile communication networks have been changing for generations.Currently, synchronous mobile communication system (CDMA mobile communication system) called 2nd generation or 2.5 generation network and asynchronous mobile communication system (WCDMA) called 3rd generation network. Mobile communication systems) coexist.

In order to support global roaming between asynchronous and synchronous mobile communication systems, a dual band dual mode terminal (DBDM mobile communication terminal) capable of being used in both a synchronous system and an asynchronous system has been developed. By using the terminal, different types of services may be used in each of the asynchronous system area and the synchronous system area. The DBDM mobile communication terminal includes an antenna, a module for synchronous mobile communication service, a module for asynchronous mobile communication service, and a common module.

As the DBDM mobile communication terminal moves from the asynchronous region to the synchronous region, the DBDM mobile terminal detects that the radio wave strength with the asynchronous mobile communication system is weakened and prepares for handover. In addition, if it is confirmed that the asynchronous base station does not exist through communication with the base station of the asynchronous mobile communication system, by synchronizing the radio wave for the synchronous mobile communication through the synchronous module and obtains a channel from the synchronous mobile communication system service of the synchronous mobile communication system Will receive.

When the mobile terminal handovered from the asynchronous area to the synchronous area by this method moves to an area capable of asynchronous service, there is no way to distinguish whether the mobile terminal is located in the area capable of asynchronous service. When a user of a synchronous mobile communication system receives a service and wants to receive a service in an asynchronous area, a user may have to artificially change a setting of a mobile communication terminal.

In order to solve this problem, the subscriber sets preferred mobile communication network information in the mobile communication terminal, and the mobile communication terminal continuously monitors the asynchronous and synchronous mobile communication systems and, if possible, synchronizes with the preferred mobile communication network. A method of proceeding with location registration has been presented. However, this method has a problem in that power consumption of the mobile communication terminal is large and control of the mobile communication terminal is difficult in the mobile communication network.

The present invention has been made to solve the above-described problems, the mobile communication system that the subscriber prefers in the mobile communication network when the mobile communication terminal handed over from the asynchronous mobile communication system to the synchronous mobile communication system returns to the asynchronous mobile communication system There is a technical problem to induce the location registration to ensure that the continuous service is performed between different mobile communication systems for generations as well as to improve the service quality.

The present invention for solving the above technical problem is a mixed mobile communication system having a Node B, an asynchronous exchange and an asynchronous home location register, and a synchronous mobile communication system having a base station, a synchronous exchange and a synchronous home location register. In a communication system, for a dual band dual mode mobile communication terminal capable of communicating with the asynchronous mobile communication system and the synchronous mobile communication system, the home location register receives preferred mobile communication system information from a subscriber of the dual band dual mode mobile communication terminal. And storing and managing information on whether the node B and the base station overlap with other mobile communication systems in the region where the Node B and the base station are located, and receiving a location registration request from the dual band dual mode mobile communication terminal. A position including information on whether the overlap Send a request message to the node B and the base station, respectively, and the asynchronous switch and the synchronous exchange receive the location registration request of the dual band dual mode mobile communication terminal from the node B and the base station, respectively, and then the asynchronous and synchronous home locations. Receive subscriber information including preferred mobile communication system information from the asynchronous and synchronous home location register by requesting location registration with a register, and information on whether overlapping is received from the node B and the base station, and the asynchronous and synchronous home location, respectively. By selecting the mobile communication system to perform the location registration by referring to the preferred mobile communication system information received from each of the registrar, characterized in that notified to the Node B and the base station, respectively.

The present invention utilizes a NDSS (Network Directed System Selection) function for location registration from a network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed.

The NDSS function is a concept introduced for continuous service between 2nd generation network and 2.5th generation network. It is useful when multiple mobile communication services are provided in the same area. It is a function to induce automatic connection of the most suitable system. The subscriber preference system manages the access priority of the mobile communication network in the order determined by the subscriber in consideration of the tariff policy of the mobile communication system, call quality, and compatibility with the mobile terminal owned by the subscriber. Locally preferred systems for roaming should be registered and maintained. In other words, the home system has overlapping information of other mobile communication systems, and the home system exchanger has information of the mobile communication system preferred by the subscriber, and is a network that can be serviced when an event such as subscriber registration, origination, and reception occurs. Get service.

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

1 is a block diagram of a mobile communication network to which the present invention is applied.

The mobile communication terminal 10 applied to the present invention is a dual band dual mode (hereinafter, referred to as 'DBDM') mobile communication terminal, and is capable of simultaneously providing an asynchronous mobile communication service and a synchronous mobile communication service. The DBDM mobile communication terminal 10 may wirelessly connect to the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 to use voice and data services.

The asynchronous mobile communication system 20 is a wireless network controller (Node B / RNC, 210) for controlling Node B and Node B as a base station for wireless section communication with the mobile communication terminal 10, wireless network controller 210 Short service center connected with the asynchronous exchange (MSC, 220), the asynchronous exchange 220 and the No.7 common signal network 230 to perform a call exchange for providing a service to the mobile communication terminal (10) (SMSC, 240), the intelligent network controller (SCP, 250) and home location register (HLR, 260), the wireless network controller 210 and the GPRS (General Packet Radio Service) network 280 is connected to the mobile communication terminal (10) Is connected via a Serving GPRS Support Node (SGSN) 270, a SGSN 104, and a General Packet Radio Service (GPRS) network 280, which maintains a location track of the < RTI ID = 0.0 > And a Gateway GPRS Support Node (GGSN) 290 connected to and supporting interworking with external packets.

In addition, the synchronous mobile communication system 30 is connected to the mobile communication terminal 10 and the base station controller (BTS / BSC, 310) for controlling the base station and the base station for supporting the wireless section communication, and connected to one or more base station controller to perform a call exchange Short-term service center (SMSC, 340), intelligent network controller (SCP, 350) and home location register (HLR) connected through an exchange (MSC) 320, an exchange 320, and a No. 7 common signaling network 330 to perform 360, a data core network for supporting a connection between a packet data service node (PDSN, 370) and a packet data service node 370 and the Internet 40 to be connected to a base station controller to provide a packet data service to a subscriber ( DCN, 380 is configured.

The switches 220 and 320 of the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 are interconnected by No. 7 common signal networks 230 and 330.

In order to perform location registration using the NDSS function proposed by the present invention, the home location registers 260 and 360 of the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 may be implemented as dual stack home location registers. When implemented as a separate home location register as shown in Figure 1, the asynchronous and synchronous home location register can exchange messages by MAP interworking through the No.7 common signal network.

In addition, the home location register stores and manages preferred mobile communication system information for each subscriber when the mobile communication terminal is a DBDM mobile communication terminal. If the DBDM mobile communication terminal is the preferred terminal of the asynchronous mobile communication system, when the location registration request is received in the asynchronous area, the location registration is allowed in the asynchronous mobile communication system. If there is an asynchronous base station (Node B) that overlaps the synchronous area, the node B is instructed to request location registration again to the asynchronous mobile communication system.

Meanwhile, the DBDM mobile communication terminal is a preferred terminal for a synchronous mobile communication system, and when a location registration request is received in the synchronous area, the location registration is allowed to the synchronous mobile communication system, and when a location registration request is received in the asynchronous area, the mobile communication terminal is located. If there is a synchronous base station that can be communicated by checking whether there is a synchronous base station overlapped in the asynchronous region, the mobile terminal induces a request for location registration to the synchronous mobile communication system.

In addition, each Node B / RNC 210 of the asynchronous mobile communication system 20 and each base station / base station controller 310 of the synchronous mobile communication system 30 are serviced by a base station of another mobile communication system in the area in which they are located. Information on whether the mobile communication system overlaps should be managed and stored. If a request for location registration, origination, etc. is received from the DBDM mobile communication terminal to the base station, mobile communication system overlapping information is set in the location registration request message and transmitted to each exchange, and the exchange is connected with the subscriber's preferred mobile communication system information. The superposition information is compared to determine whether to instruct it to service or switch to another mobile communication system.

2 is a flowchart illustrating a concept of a location registration method according to the present invention.

In order to apply the present invention, the mobile communication terminal is a DBDM mobile communication terminal and the subscriber has set preferred mobile communication system information in the mobile communication system, and the mobile communication system has an NDSS function and performs various information management for the same. On the premise that For convenience of explanation, a case where two mobile communication systems overlap each other will be described as an example. A mobile communication system registered as a subscriber's preference is called a mobile communication system A, and the other mobile communication system is a mobile communication system B. The components of each of the mobile communication system A and the mobile communication system B will also be described so as to be roughly identified by the same identifier (A or B).

Referring to FIG. 2, when the mobile communication terminal that has registered the preferred mobile communication system information requests location registration, the base station B receives the location registration request from the exchange B, and then the exchange requests the location registration from the HLR ( S101-103). In step S102, the base station B transmits the location registration request message to the exchange B, including information indicating whether it overlaps with another mobile communication system.

The HLR checks whether the preferred mobile communication system information is registered by inquiring the subscriber information requesting location registration (S104), and transmits the information to the exchange B when the preferred mobile communication system information is registered, and the exchange B receives from the base station B. It decides whether to process the service or switch to another network according to the overlapping information and the preferred mobile communication system information received from the HLR.

In the present embodiment, it is assumed that the subscriber's preferred mobile communication system is mobile communication system A and base station B overlaps with base station A, so that exchange B receiving such information from the HLR rejects the location registration request to base station B. The base station B informs the mobile communication terminal that the location registration has been rejected (S105). In steps S105 and S106, the switch B is informed of the subscriber's preferred mobile communication system information to the base station B and the base station B to the mobile communication terminal.

Accordingly, the mobile communication terminal transmits a location registration request message to the base station A of the preferred mobile communication system (mobile communication system A) (S107), and receives and transmits a signal between the received base station A, the exchange A, and the HLR. The location registration procedure is performed (S108).

The location registration procedure using the NDSS function is particularly useful when the mobile communication terminal having registered the mobile communication system A as the preferred mobile communication system hands over to the mobile communication system B and then enters the mobile communication system A area again. It is useful for the terminal to connect to the mobile communication system A to receive the service. That is, since the mobile communication system A and the mobile communication system B overlap, the mobile communication terminal returned to the mobile communication system A continues to receive service through the mobile communication system B. However, when the present invention is applied, the mobile communication system A By registering the location of the network, the connection with the mobile communication system B is interrupted and the service can be received from the mobile communication system A.

3 is a flowchart illustrating a location registration method according to an embodiment of the present invention. In particular, when a dual stack home location register is provided and a preferred mobile communication system of a subscriber is a synchronous mobile communication system, the synchronous mobile communication system Shows a location registration procedure of a mobile communication terminal currently receiving a service from an asynchronous mobile communication system in a region where the and asynchronous mobile communication systems overlap.

First, the location registration request message (Registration) of the mobile communication terminal is transmitted to the node B of the asynchronous mobile communication system (S201), the node B requests the location registration to the asynchronous exchange (A-Location Updating Request) (S202). At this time, the Node B notifies the asynchronous exchange whether it overlaps with another mobile communication system.

The asynchronous exchange requests the location registration to the home location register (MAP-Location Update INV) (S203), and the home location register that receives the information retrieves the subscriber information and extracts the preferred mobile communication system information (Prefer_Sys = 2.5G). Information is transmitted to the asynchronous exchange (MAP-Insert Subscriber Data INV) (S204), the asynchronous exchange transmits a response signal for receiving subscriber information to the home location register (MAP-Insert Subscriber Data RR) (S205), and the home The location register transmits a message (A-Location Update) requesting location information update to the asynchronous exchange (S206).

Thereafter, the asynchronous exchange notifies the node B that the location registration request has been rejected (A-Location Updating Reject) (S207), and transmits the reason (Cause = 2.5G) with which the location registration request was rejected. The node B also transmits the fact that the location registration request is rejected to the mobile communication terminal and the reason (Registration Reject (Cause = 2.5G)) (S208).

The mobile communication terminal notified that the location registration request has been rejected requests the location registration to the base station of the synchronous mobile communication system which is the preferred mobile communication system according to the preferred mobile communication system information included in the location registration refusal received from Node B (Registration). (S209), the base station receives the request for location registration to the synchronous exchange (A-Registration) (S210), and the synchronous exchange requests for location registration to the home location register (MAP_RegNot INV) (S211).

Subsequently, the home location register transmits a message (MAP_RegNot RR (Prefer_Sys)) indicating that the location registration to the preferred mobile communication system has been performed by the synchronization switch, and a message indicating that location registration has been performed by the synchronization switch to the base station (A-Registration Accept). ), And the base station transmits a response message (Registration Accept) indicating that the location registration is completed to the mobile communication terminal (S212 ~ S214).

FIG. 4 is a flowchart illustrating a location registration method according to another embodiment of the present invention. In particular, when a subscriber's preferred mobile communication system is an asynchronous mobile communication system, the synchronous mobile communication system and the asynchronous mobile communication system overlap each other. A location registration procedure of a mobile communication terminal currently receiving a service from a synchronous mobile communication system is shown.

First, a location registration request message (Registration) of the mobile communication terminal is transmitted to the base station of the synchronous mobile communication system (S301), and the base station requests a location registration to the synchronous exchange (A-Registration) (S302). At this time, the base station notifies the synchronization exchange whether it overlaps with another mobile communication system.

Thereafter, the synchronization exchange requests the location registration to the home location register (MAP_RegNot INV) (S303), and the received home location register queries the subscriber information and extracts the preferred mobile communication system information (Prefer_Sys = 3G) and then the subscriber information. (MAP-RegNot RR) (S304), the synchronous exchange switches the service to another mobile communication system through the mobile communication system overlapping information received from the base station and the preferred mobile communication system information received from the home location register. Determines that this is necessary, and notifies the base station to retry location registration (A-ServiceRedirection) (S305). In this case, it is also possible to transmit the reason for retrying and the preferred mobile communication system information.

Accordingly, the base station has refused the location registration to the mobile communication terminal, requests to re-request the service (ServiceRedirection) (S306), the mobile communication terminal requests the location registration to Node B of the asynchronous mobile communication system (Registration) (S307). In step S306, it is also possible to transmit the reason for retrying registration registration and the preferred mobile communication system information.

Receiving a location registration request from the mobile communication terminal, Node B requests location registration to an asynchronous exchange (A-Location Updating Request) (S308), and the asynchronous exchange requests location registration to a home location register (MAP-Location Update INV). Accordingly, the home location register inquires the subscriber information, extracts the preferred mobile communication system information (Prefer_Sys = 3G), and transmits it to the asynchronous exchange with the subscriber information (MAP-Insert Subscriber Data INV) (S310). The asynchronous exchange sends a response signal for receiving subscriber information to the home location register (MAP-Insert Subscriber Data RR) (S311), and the home location register indicates a message indicating that the location information update is completed to the asynchronous exchange (A-Location Update). ) Is transmitted (S312).

Thereafter, the asynchronous exchange transmits a message indicating that location registration has been performed to the node B (A-Location Updating Accept), and the node B transmits a response message (Registration Accept) indicating that location registration is completed to the mobile communication terminal (S313). S314).

The present invention described above can be usefully applied when the asynchronous mobile communication system is implemented by overlapping a part of the synchronous mobile communication system. That is, when the subscriber who registered the asynchronous mobile communication system as the preferred system returns to the asynchronous mobile communication system after handing over to the synchronous mobile communication system while using the asynchronous mobile communication service, the service from the synchronous mobile communication system continues. Location registration can be performed in the asynchronous mobile communication system by the above-described procedure, in which case the user can provide a high quality service through the desired system.

On the contrary, the mobile communication system subscriber who prefers the synchronous mobile communication system may also apply to the case where the mobile subscriber returns to the synchronous mobile communication system after handover to the asynchronous mobile communication system while using the synchronous mobile communication service.

The present invention described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

The present invention described above may provide a continuous service of a dual band dual mode mobile communication terminal using the NDSS function in a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed. In particular, if the subscriber has set the preferred mobile communication system, the NDSS function induces the location registration to the mobile communication system registered by the subscriber as the preferred mobile communication system in a region where the synchronous mobile communication system and the asynchronous mobile communication system overlap. This has the advantage of improving the quality of service.

1 is a configuration diagram of a mobile communication network to which the present invention is applied;

2 is a flowchart illustrating a concept of a location registration method according to the present invention;

3 is a flowchart illustrating a location registration method according to an embodiment of the present invention;

4 is a flowchart illustrating a location registration method according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: DBDM mobile communication terminal 20: asynchronous mobile communication system

30: synchronous mobile communication system 40: Internet

50: interconnection unit 210: Node B / wireless network controller

220: asynchronous exchange 230, 330: No.7 common signal network

240, 340: Short Message Service Center 250, 350: Intelligent Network Controller

260, 360: Home Location Register 270: SGSN

280: GPRS network 290: GGSN

310: base station / base station controller 320: switchboard

370: packet data service node 380: data core network

Claims (14)

A mobile communication system comprising a non-synchronous mobile communication system including a node B, an asynchronous exchange and an asynchronous home location register, and a synchronous mobile communication system including a base station, a synchronous exchange, and a synchronous home location register, The asynchronous exchange and the synchronous exchange are connected by an interworking unit, and the asynchronous home location register and the synchronous home location register transmit and receive a message through a No. 7 signal switching network, For a dual band dual mode mobile communication terminal capable of communicating with the asynchronous mobile communication system and the synchronous mobile communication system, the home location register receives and stores preferred mobile communication system information from the subscriber of the dual band dual mode mobile communication terminal. , Each of the Node B and the base station stores and manages information on whether the mobile station overlaps with another mobile communication system in the region where the Node B and the base station are located, and when the location registration request is received from the dual band dual mode mobile communication terminal, Transmitting a location registration request message including information to the Node B and the base station, respectively; The asynchronous exchange and the synchronous exchange receive the location registration request of the dual band dual mode mobile communication terminal from the Node B and the base station, respectively, and then request the location registration to the asynchronous and synchronous home location register to the asynchronous and synchronous home location. Receive subscriber information including preferred mobile communication system information from the registrar, and refer to information on whether overlapping is received from the Node B and the base station and preferred mobile communication system information received from the asynchronous and synchronous home location registers, respectively. A mobile communication system comprising selecting a mobile communication system to perform location registration and notifying each node B and a base station, respectively. The method of claim 1, And the asynchronous home location register and the synchronous home location register are integrated into a dual stack home location register. The method of claim 1, The asynchronous exchange and the synchronous exchange include the preferred mobile communication system information of the mobile communication terminal when notifying and selecting the mobile communication system to perform location registration to the node B and the base station, respectively. system. A location registration method of a dual band dual mode mobile communication terminal in a mobile communication system in which a first mobile communication system and a second mobile communication system are mixed, A home location register (hereinafter, referred to as a first home location register) of the first mobile communication system and a home location register (hereinafter, referred to as a second home location register) of the second mobile communication system are provided from the dual band dual mode mobile communication terminal subscriber. Receive and save preferred mobile communication system information, Requesting a location registration from a base station (hereinafter referred to as a first base station) of the first mobile communication system to receive a location registration request from the mobile communication terminal to an exchange (hereinafter referred to as a first exchange) of the first mobile communication system; Requesting, by the first exchange, location registration to the first home location register; The first home location register queries the subscriber information requesting the location registration to check whether the preferred mobile communication system information is registered, and if the preferred mobile communication system information is registered, transfers preferred mobile communication system information to the first switch. Transmitting; Determining, by the first exchange, whether to process the location registration request or switch to the second mobile communication system with reference to preferred mobile communication system information received from the first home location register; When the first exchange determines to switch the location registration request to the second mobile communication system, notifying the mobile communication terminal of the location registration request to the mobile communication terminal through the first base station; Requesting, by the mobile communication terminal, location registration to a base station (hereinafter referred to as a second base station) of the second mobile communication system; And Performing a location registration procedure between the second base station, a switch (second switch) of the second mobile communication terminal, and a home location register (second home location register) of the second mobile communication terminal; Location registration method comprising a. The method of claim 4, wherein And requesting location registration from the first base station to the first exchange, transmitting location information of the first base station to another mobile communication system to the first exchange. The method of claim 4, wherein The step of notifying, by the exchange, that the location registration request is rejected to the mobile communication terminal through the first base station, the first exchange to the first base station, the first base station to the mobile communication terminal reason for rejection And transmitting the preferred mobile communication system information. In a mobile communication system including a Node B, an asynchronous exchange and an asynchronous home location register, and a synchronous mobile communication system including a base station, a synchronous exchange and a synchronous home location register, A location registration method, wherein the asynchronous home location register and the synchronous home location register receive and store preferred mobile communication system information from the dual band dual mode mobile communication terminal subscriber, and store and manage the preferred mobile communication system. When the mobile communication terminal is connected to the asynchronous mobile communication system, Requesting a location registration from the node B to the asynchronous exchange by receiving the location registration request message of the mobile communication terminal; The asynchronous exchange requests location registration to the asynchronous home location register, the asynchronous home location register queries the subscriber information requesting the location registration, extracts the preferred mobile communication system information, and then sends the information to the asynchronous exchange together with the subscriber information. Transmitting; Sending, by the home location register, a message requesting location information update to the asynchronous exchange; The asynchronous exchange notifying the Node B that a location registration request has been rejected; Notifying, by the Node B, a location registration request rejection to the mobile communication terminal; Requesting location registration by the base station as the mobile communication terminal, upon being notified that the location registration request has been rejected, requests a location registration to a base station of the synchronous mobile communication system; Requesting, by the synchronous exchange, the location registration to the synchronous home location register and receiving a response signal; And The synchronization exchange notifying the base station that location registration has been performed, and the base station notifying the mobile communication terminal that location registration has been completed; Location registration method comprising a. The method of claim 7, wherein And requesting location registration from the node B to the asynchronous exchange further includes notifying whether the node B overlaps with the synchronous mobile communication system. The method of claim 7, wherein And the step of notifying the node B that the location registration request has been rejected by the asynchronous exchange further comprises transmitting to the node B the reason and preferred mobile communication system information for which the location registration request was rejected. Location registration method. The method of claim 7, wherein And the node B notifying the mobile communication terminal of the fact that the location registration request is rejected further comprises the step of transmitting, by the node B, the reason for rejecting the location registration request and preferred mobile communication system information to the mobile communication terminal. Location registration method characterized in that. In a mobile communication system including a Node B, an asynchronous exchange and an asynchronous home location register, and a synchronous mobile communication system including a base station, a synchronous exchange and a synchronous home location register, A location registration method, wherein the asynchronous home location register and the synchronous home location register receive and store preferred mobile communication system information from the dual band dual mode mobile communication terminal subscriber, and store and manage the preferred mobile communication system. When the mobile communication terminal is connected to the synchronous mobile communication system, Requesting, by the mobile communication terminal, location registration from the base station to the synchronization switch; Requesting, by the sync exchange, location registration to the sync home location register; Querying, by the synchronous home location register, the subscriber information requesting the location registration, extracting preferred mobile communication system information, and transmitting subscriber information and preferred mobile communication system information to the synchronous exchange; Notifying the base station to retry location registration by the synchronization exchange; Notifying, by the base station, that the location registration has been rejected to the mobile communication terminal, and requesting to request a location registration service again; As the mobile communication terminal requests location registration to node B of the asynchronous mobile communication system, the node B requesting location registration to the asynchronous exchange; The asynchronous exchange requesting a location registration to the asynchronous home location register; Transmitting the response signal to the asynchronous home location register by the asynchronous home location register as the asynchronous home location register queries the subscriber information, extracts preferred mobile communication system information, and transmits the subscriber information together with the subscriber information; The asynchronous home location register notifying the asynchronous exchange that location information update is complete; The asynchronous exchange notifying the node B that location registration has been performed; And Notifying, by the Node B, that location registration is completed to the mobile communication terminal; Location registration method comprising a. The method of claim 11, And requesting location registration from the base station to the synchronous exchange further includes notifying whether the base station overlaps with the asynchronous mobile communication system. The method of claim 11, The step of notifying the base station to retry location registration by the synchronization exchange further includes the step of transmitting the location registration retry reason and preferred mobile communication system information to the base station by the synchronization exchange. Way. The method of claim 11, The step of notifying the mobile station to retry location registration by the base station further comprises the step of transmitting the location registration retry reason and preferred mobile communication system information to the mobile communication terminal. Location registration method.