KR20010002525A - Method for roaming service in a digital trunked radio system - Google Patents

Abstract

PURPOSE: A roaming service method in a digital TRS(Trunked Radio System) is provided to equip VLRs(Visitor Location Register) in exchanges of each local service provider and equip an HLR(Home Location Register) in a central center, so as to perform message routing and registration control between the exchanges of the local service providers, so that high-quality nationwide network services without call disconnection can be provided to subscribers. CONSTITUTION: If a terminal serviced through an exchange of a digital TRS of a present local service provider moves to a service area of another local service provider, the terminal transmits a registration request message to a new local sector. The new sector transmits the registration request message to a CC(Central Controller) of the exchange. The CC searches whether SUID(SUbscriber IDentity) is registered in the CC. If the SUID is registered, an idle handover process is performed. If the SUID is not registered, information of corresponding SUID is requested to a VLR. If the information of the SUID is defined in the VLR, the idle handover process is performed. If the information of the SUID is not defined in the VLR, visitor ID for the SUID of the corresponding terminal is allocated and registered in the VLR, and new terminal registration is requested to an HLR of the central center. The HLR registers information on the corresponding terminal, and delivers a registration confirm message to an exchange CC of a new service provider, then transmits a registration cancel message to the CC of a prior service provider. The CC of the new service provider registers the new SUID, and registers the terminal at a new sector, to control the terminal to continuously perform services. The CC of the prior service provider cancels the registration for the SUID, and delivers a registration cancel message to a prior base station to cancel the registration of the terminal.

Description

Roaming service method in digital frequency common communication system {Method for roaming service in a digital trunked radio system}

The present invention relates to a roaming service method in a digital frequency communication system, and in particular, a system (home location register (HLR) / visitor location register (VLR)) for sharing subscriber location information and registration control between local operators is added. The present invention relates to a roaming service method in a digital frequency common communication system that enables nationwide network service by implementing a roaming function.

In general, a frequency common communication system (TRS) is a system in which a plurality of channels are shared by a plurality of users so that a user automatically selects and uses an empty channel among the plurality of channels. Therefore, the use of frequency is high, the call quality is improved, data communication and fax (FAX) communication is possible, and the frequency uses 800 [Mhz] band.

This TRS system can give individual call to mobile station (mobile phone) to make individual call, and can make all call with the whole group at command center. Communication function and emergency notification service can be provided, so it can be conveniently used for security, transportation, construction and port fields.

The characteristic of D-TRS (Digital Frequency Public Communication System) in TRS system that performs this function is that frequency hopping (FH) per channel is used, so the frequency hopping speed is lower than 200 [hope / sec], It provides 40 voice channels at 10 frequencies and vocodes 4.8 [Kbps] using a voice encoder.

The configuration of the switching center controller in the D-TRS system performing this function is as shown in FIG.

As shown in the drawing, a central control unit (CC) 1 for controlling the operation of the frequency common communication system through an Ethernet network, and a database server providing a database of the frequency common communication system through the Ethernet network ( DBS) (2), an operation control unit (AC) for controlling the operation of the frequency common communication system through the Ethernet network (3), and a data control unit (DC) for controlling data operated in the frequency common communication system via the Ethernet network. (4), a base station controller (SC) 5 for controlling a base station of a frequency common communication system through the Ethernet network, and a local controller (LC) 6 for changing parameters of an operating system through the Ethernet network. .

The switching center controller of the general digital frequency common communication system configured as described above initializes each control unit (1 to 5) using a monitor and a keyboard installed for each of the five control units (1 to 5) connected through the Ethernet network, and performs frequency initialization. The public communication system was operated.

The service in the digital frequency common communication system is operated independently without interworking between operators by having an independent system by local operators.

In other words, each local operator has one switching center, and is operated by an independent database server (DBS) in which subscriber information is stored in the switching center, and by a central control unit (CC) responsible for terminal registration, service class management, and call processing. It provides Idel hand over function between sectors in the service area.

However, roaming service between local operators was not possible because the system (HLR / VLR) and algorithm for managing the sharing of subscriber information between local operator systems were not implemented for national network interworking.

In other words, since subscriber information does not exist in other local operator exchange stations, and there is no system for information exchange and registration control between local operator exchange stations, the service is disconnected when the subscriber moves to the service area of another local operator. In this case, the mobile subscriber can continue to receive the service only after retrying the terminal registration with another local operator to update the location information and registering as a visitor subscriber at the new local operator exchange office.

Accordingly, the present invention has been proposed to solve various problems occurring in the general digital-frequency common communication system as described above.

An object of the present invention is to add a system (home location register (HLR) / visitor location register (VLR)) for sharing the subscriber location information and registration control between local operators to implement a roaming function to enable digital network service nationwide The present invention provides a roaming service method in a frequency common communication system.

The present invention (method) for achieving the above object,

In order to provide a roaming function for interworking with the national network, the HLR system is provided at the D-TRS central center where the subscriber data can be shared and managed between local operators, and the VLR system is provided at the exchange office of each local operator. In such a state, if the subscriber in service moves to another local service area (new_service_area), the location registration is re-registered. At this time, the SUID of the terminal is registered with the VLR of the new_service_area switching center and assigned a visitor ID. The newly assigned visitor ID and the existing SUID are sent to the HLR of the central center for registration. After receiving this request message, the HLR stores the location information of the terminal, sends the registration permission to the new_service_area exchange and the unsubscribe message to the old service area (old_service_area) exchange. Each service area exchange that receives each of these messages performs registration and deregistration according to the corresponding procedure, and the subscriber station continuously receives quality service even if the service area changes.

1 is a schematic diagram of an exchange station controller of a common local operator digital frequency communication system;

2 is a schematic diagram of an exchange station of each local operator digital frequency communication system including a visitor location register (VLR) according to the present invention;

3 is an explanatory diagram illustrating a roaming service method according to the present invention;

4 is a flowchart illustrating a roaming service method in a digital frequency common communication system according to the present invention;

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

7, 11: home location register

10: central center

20, 30, 40, 50: local operator system

21, 31, 41, 51: Visitor Location Register

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above in detail.

2 is a block diagram of an exchange station of each local operator digital frequency communication system to which a visitor location register (VLR) is added in the present invention.

Here, the configuration of the central control unit 1, the database server 2, the operation control unit 3, the data control unit 4, the base station control unit 5, the local controller 6 is the general local operator D-TRS of FIG. It is the same as the exchange office, and the visitor location register 7 which stores and manages the visitor location information is added here.

Figure 3 is a schematic diagram showing the overall configuration of the digital frequency common system for implementing a roaming function in the present invention, reference numerals 20, 30, 40, 50 are each local operator system having a visitor location register, It has a home location register as a central center.

Roaming service method according to the present invention using the local operator switching center system and the central center is as shown in FIG.

As shown, when the terminal receiving the service through the exchange station of the current local operator D-TRS system moves to another local operator service area, the terminal transmits a registration request message to the sector of the new region (S1), The new sector transmits a registration request message to the central control unit (CC) of the switching center (S2), wherein the central control unit searches whether the SUID of the terminal requesting registration is registered with the central control unit (S3 to S4), and the terminal. If the SUID of the registered in the central control unit to bring the corresponding SUID to the central control unit and register the terminal to the new base station, and transmitting a deregistration request message for the previous service provider to the home location register of the central center (S5), At step S6, the home location register transmits a deregistration message to the central control unit of the previous service provider switching center. A central control unit of a switching center receiving a deregistration message is sent to the terminal registration cancellation message to the previous base station it comprises a step (S7) to clear the terminal registration.

In addition, if the SUID of the terminal as a result of the search in step S4 is not registered in the CC, requesting information of the corresponding SUID to the visitor location register (S8), and if the information on the SUID is defined in the VLR, A step S9 of moving to the above-described step S5 is included.

In addition, if the information on the SUID is not defined in the visitor location register, by assigning a visitor ID for the SUID registered in the visitor location register, requesting a new terminal registration to the home location register of the central center 10 ( S10), the home location register which is requested to register a new terminal, after storing the information of the corresponding terminal, sending a registration confirmation message to the central office of the switching center of the new service provider and transmitting a registration cancellation message to the central controller of the previous service provider ( S11), after the central control unit of the new service provider registers the new SUID and controls the terminal to continuously perform the service by registering the terminal in the new sector (S12), the central control unit of the previous service provider registers the corresponding SUID. And cancel the registration message to the previous base station It further comprises the step of canceling the registration (S13).

In the roaming service method according to the present invention, if any terminal first transmits a call to an exchange (hereinafter referred to as a domestic exchange) of a service provider (hereinafter, referred to as a local service provider) in a region where it is registered, After the authentication and registration process is completed, the local exchange will perform the requested services (Telephony, Dispatch, Data).

Here, a unique number for identifying a subscriber in the authentication and registration procedure in the air interface section of the digital frequency common communication system is SUID (SUbscriber IDentity). This SUID consists of Base ID + Customer ID + Department ID + PID. Here, Base ID is a unique number assigned to each local operator, Customer ID and Department ID are numbers assigned to the receiving company, and PID is a unique number of the subscriber receiving the service. Using this unique number SUID identifying the subscriber station, idle hand over and roaming functions are implemented by the following procedure.

First, the Idle hand over between sectors (old sector-new sector) in a single regional service provider area is as follows.

The terminal receiving the service from the previous sector sends a registration request message to the new sector when moving to a new sector, and the new sector receives the terminal registration request message to the central control unit of the switching center. The central control unit of the switching center receiving the message registers the terminal SUID to the new base station when the SUID of the terminal which attempted the registration request is registered in the CC. The terminal registration message is sent to the new sector and the terminal registration message is sent to the previous sector. In addition, a registration confirmation message is sent to the terminal through a new sector. The previous sector deregisters the terminal according to the terminal deregistration message. The new sector also registers the terminal and sends a registration confirmation to the terminal via the CAI. Accordingly, the terminal receiving the registration confirmation can continue to receive the service.

Next, the roaming service method according to the present invention to continuously receive services by moving to another local service provider area is as follows.

First, when a terminal receiving a service through a local exchange office moves to a service area of another local operator, the terminal transmits a registration request message to a new sector in the service area of another local operator (S1).

The new sector in the other regional service area receives the terminal registration request message to the central control unit of the switching center (S2).

Upon receiving the terminal registration request message, the central control unit of the switching center checks whether the SUID of the terminal that attempted the registration request has been registered in the CC, and performs an idle hand over procedure when it is registered (S3 to S4).

That is, if the information of the SUID of the terminal is defined in the VLR (SUID has a visitor ID, which means that the SUID is registered in the HLR), the information is brought to the CC and a new base station (a base station of a new sector) is imported. It registers the SUID of the terminal to the terminal, and transmits a registration release request message for the previous service area (the area that initially performed the service of the terminal) to the home location register of the central center (S5).

The home location register which has received the deregistration message of the previous service area transmits a deregistration message to the CC of the switching center of the previous service area (S6).

Upon receiving the deregistration message, the CC in the exchange station of the previous service area transmits the terminal deregistration message to the previous sector, thereby canceling the registration of the terminal (S7).

On the other hand, if the SUID of the terminal attempting the registration request is not registered in the CC, the information of the SUID is requested to the VLR (S8), if the SUID of the terminal is defined in the VLR (S9), The process returns to step S5, and the following operation is the same as the known operation.

Next, if the SUID of the corresponding terminal is not defined in the VLR, the visitor ID for the SUID of the corresponding terminal is assigned and registered in the VLR, and then a new terminal registration is requested to the home location register of the central center 10 ( S10).

After receiving the message requesting the registration of the new terminal, the home location register stores the information (SUID, visitor ID) of the corresponding terminal, transmits a registration confirmation message to the exchange CC of the new service area, and transfers the cancellation of registration message. Transmit to the exchange CC in the service area (S11).

Accordingly, the CC of the new service area registers the new SUID and registers the terminal in the new sector so that the terminal can continuously receive the service (S12).

In addition, the CC of the previous service area cancels the registration of the corresponding SUID and transmits a registration cancellation message to the previous sector to cancel the registration of the terminal (S13).

As described above, the present invention includes a visitor location register for storing and managing location information of a visitor subscriber at an exchange station of each local operator, and a home location register at a central center for routing messages between each local operator exchange station. And by enabling the registration control function, the subscriber receiving the digital frequency public telecommunications system service is effective in being able to receive a high-quality national network service without disconnection during local movement.

Claims (2)

In the digital frequency common communication system consisting of a central center having a home location register, each local operator system having a visitor location register, Transmitting, by the terminal, a registration request message to a sector of a new region when a terminal receiving a service through an exchange station of a current local operator D-TRS system moves to another local operator service area; The new sector sends a registration request message to the central control unit (CC) of the switching center, wherein the central control unit searches whether the SUID of the terminal requesting registration is registered with the central control unit; Performing an idle handover procedure when the SUID of the terminal is registered in the central control unit and requesting information of the SUID from the visitor location register when the SUID of the terminal is not registered in the CC; If the information on the SUID is defined in the VLR, the idle handover procedure is performed. If the information on the SUID is not defined in the visitor location register, the visitor location register is assigned by assigning a visitor ID for the SUID of the corresponding terminal. Requesting registration of a new terminal to a home location register of the central center after registering with the service provider; The home location register which has been requested to register the terminal newly stores information on the corresponding terminal, and transmits a registration confirmation message to the central office of the switching center of the new service provider and transmits a cancellation message to the central controller of the previous service provider. After registering the new SUID, the central control unit of the new service provider registers the terminal in the new sector to control the terminal to continuously perform the service, and the central control unit of the previous service provider cancels the registration of the SUID, And a method of canceling registration of the terminal by sending a registration cancellation message. The method of claim 1, wherein the idle handover procedure, Bringing the SUID of the terminal to the central control unit and registering the terminal with the new base station, and transmitting a deregistration request message for the previous service provider to the home location register of the central center; The home location register transmitting a deregistration message to a central control unit of a previous service provider switching center; The central control unit of the switching center receiving the deregistration message sends a terminal deregistration message to a previous base station to cancel terminal registration.