JPH05344559A - Inter-zone exchanging system in mobile communication system - Google Patents

Abstract

PURPOSE:To execute hand-off processing without using an exclusive line by allowing an unmoved line control station B to receive receiving level information measured by a moved base station B, transmit hand-off determining condition to a line control station A through a false mobile station C and allowing the station A to transmit channel specifying information from the station B to a mobile station concerned. CONSTITUTION:When a mobile station B is separated from a base station C and the receiving level of a receiver C1 is reduced, the base station C allows a line control station B to measure the receiving level of a mobile station B by the image receivers B1, C2 of adjacent base stations. In this case, the receiver C2 close to the mobile station B indicates the maximum receiving level and the station B determines hand off from the station C to the station B and is connected to a line control station A through a false mobile station C and a telephone exchange X. Then a connecting station A specifies the channel of the mobile station B through a false mobile station C and a control station B and the channel of the mobile station B-control station A-control station B-network X-telephone set J is constituted. Consequently hand-off processing can be executed without connecting an exclusive line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-zone switching system for a mobile communication system, and more particularly to a telephone switching network connected to a plurality of line control stations for controlling a plurality of mobile stations and base stations arranged in a plurality of zones. In the mobile communication system having the above, the present invention relates to an inter-zone exchange method of a mobile communication system that switches while continuously communicating between mobile stations that are moving while communicating between base stations that are collectively controlled by different line control stations.

[0002]

2. Description of the Related Art Conventionally, a mobile communication system of this type is a technology required for a car telephone system, etc.
The configuration of the inter-zone exchange system of this mobile communication system is shown in FIG.
Will be explained. FIG. 4 shows base stations A, B, C, D arranged in each zone, mobile stations A, C communicating in the zones of base stations A, D, and zones of base station C to base station B. Mobile station B and base stations A to D that are communicating while moving to
, Radios A to D provided for radio communication with mobile stations, receivers A, B1, C1 and D for measuring received power in its own zone,
The circuit control station A which controls the base stations A and B and controls subscriber connection with the telephone switching network X, and the base stations C and D
And a dedicated line P for relaying information of mobile stations moving between zones, which will be described later, between the line control station B and the line control stations A and B for controlling the similar subscriber connection.
A telephone switching network X connected to the line control station at B and telephones A to J connected by subscriber lines.

Next, the inter-zone exchange method will be described by taking the case where the mobile station B moves from the base station C to the base station B as an example. In reality, the need for tracking exchange (hereinafter referred to as handoff) is eliminated by adjusting the range of the base station that controls the line control station to the range of movement of the mobile station, and different line control is performed for base stations with a specific positional relationship. By installing a base station of a type that interpolates between zones that are centrally controlled by the stations, different line control stations collectively control and handle handoff occurrence between the base stations between the line control stations. As shown in FIG.
The line control stations A and B are provided with a dedicated line P for communication between the line control stations A and B, which are different from each other for the movement information of the mobile station B, and are required for handoff processing between the line control stations. The data communication was performed, and the line control station A, which is a new line control station, was centrally controlled using the dedicated line P for communication, and was connected to the base station B to realize the handoff.

[0004]

DISCLOSURE OF THE INVENTION The above-mentioned inter-zone switching system of the conventional mobile communication system described above uses a data communication line or a bypass line for handing off a base station that is centrally controlled between different line control stations. Since the data communication processing is performed via the equipment of the communication line and the data communication line, there is a drawback that a dedicated line is required.

An object of the present invention is to handoff
Location registration of the mobile station handing off to the new line control station, setting of the channel used for communication at the new base station, transfer from the telephone connected by the previous line control station to the new line control station of the communication path, and to the mobile station You will need instructions for changing the channel,
By implementing a pseudo mobile station near the zone adjacent to each base station and by changing the connection between trunk trunks in the circuit control station, these processes can be implemented as an interzone exchange method that does not use a dedicated line. It is in.

[0006]

An inter-zone switching system of a mobile communication system according to the present invention comprises a plurality of mobile stations, base stations arranged in a plurality of zones, and a plurality of line control stations for controlling the base stations in a centralized manner. , There is a telephone connected to this line control station via a telephone switching network, and a channel is established between the mobile station and each line control station that controls it when moving from a base station in one zone to a base station in an adjacent zone. In the inter-zone switching system of the mobile communication system for mutually communicating change and trunk switching information, etc., the first circuit control station B before movement
From the mobile station to the base station B in the adjacent zone to which the mobile station is moving, and the first line control station receives the reception level information of this first procedure and sends the handoff decision information to the pseudo movement of the adjacent zone. The second procedure of contacting the station C, and the second line control station A in which the pseudo mobile station C controls the movement-destination base station.
And a fourth procedure in which the second line control station A sends the channel designation information to the first line control station B via the pseudo mobile station C, and the first line control Station B communicates the channel designation information to the corresponding mobile station.

[0007]

The present invention will be described below with reference to the drawings. 1 is a block diagram of a mobile radio communication system having different line control stations according to an embodiment of the present invention, FIG. 2 is a block diagram of the line control station, and FIG. 3 is a control sequence diagram for explaining the operation of the present embodiment. .. In the embodiment of FIG. 1, pseudo mobile stations C and B and receivers B1 and C2 and receivers B2 and C1 are provided in the zones of the base stations B and C, respectively.

In FIG. 1, it is assumed that the mobile station B is moving from the zone of the base station C to the zone of the base station B.
Therefore, although not shown, the bases A and B have the same configuration and function.

Next, the operation of the present embodiment will be described mainly with reference to FIG. In the control procedure for handoff, when the mobile station B moves away from the base station C, the reception level of the receiver C1 at the base station C decreases, so the base station C notifies the line control station B of the deterioration of the reception level (S- 1). The line control B is a receiver B of a base station adjacent to the base station C (here, the base station B and the base station D).
1 and C2 are instructed to measure the reception level of mobile station B (S-
2). In this case, since the mobile station B is approaching the base station B, the receiver C2 has the highest reception level,
The line control station B determines the handoff from the base station C to the base station B (S-3). However, the base station B is the line control station B
Since data cannot be directly controlled from the mobile station B, the data of the mobile station B is sent to the pseudo mobile station C to cause the base station B to perform temporary location registration and call origination (S-4). The communication partner at this time is the special number A in the line control station B, which is provided for handoff in advance.
(The number corresponding to the subscriber line trunk A shown in FIG. 2) is used. The base station B and the line control station A, which have received the temporary call from the pseudo mobile station, accept the call from the new mobile station and pass through the telephone exchange network X to the special number A of the line control station B.
Is called (S-4). The line control station A, which has detected from the response of the telephone switching network that the special number A has been connected, selects (S-
5) Select a communication channel for the pseudo mobile station C and designate a channel (S-6). Upon receiving the channel designation, the pseudo mobile station C sends a communication channel to the line control station B (S-
7). When the special number A is called from the telephone switching network, the line control station B holds the communication channel and waits for the channel designation from the pseudo mobile station B, and when receiving the channel designation, instructs the mobile station B to change the channel. Perform (S-8). Further, the subscriber line trunk connected to the telephone set J in the line control station B and the subscriber line trunk A dedicated to handoff are connected (S-9). The call path in the line control station in this state is shown in Fig. 2.
Shown in.

By the above processing, the mobile station B-base station B-
The line control station A-telephone switching network-line control station B-line switching network-telephone J constitutes a speech path, and base station C to base station B
Handoff is performed.

In the description of FIGS. 1 and 2, the telephone switching network and the line control station are connected by a trunk trunk. However, in a small system, the line control station has a telephone switching function. It is also possible to realize a system in which the telephone line is directly connected to the subscriber line.

[0012]

As described above, according to the present invention, the handoff between the base stations that collectively control different line control stations is performed without providing a dedicated line between the line controls, and especially in the new line control station. There is an effect that the handoff function can be processed as a normal call processing that is completely unaware of the processing.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a line control station which is a main part of the present embodiment.

FIG. 3 is a flowchart for explaining the operation of this embodiment.

FIG. 4 is a block diagram of an inter-zone exchange system of a conventional mobile communication system.

[Explanation of symbols]

 A, B Circuit control station B, C Pseudo mobile station B1, C1, B2, C2 Receiver X Telephone switching network

Claims (3)

[Claims] 1. A plurality of mobile stations and respective base stations arranged in a plurality of zones, a plurality of line control stations that collectively control the base stations, and a telephone connected to the line control stations via a telephone exchange network. Yes, a zone of a mobile communication system in which the mobile station mutually communicates channel change and trunk switching information and the like with respective circuit control stations that control it when moving from a base station of a certain zone to a base station of an adjacent zone. In the inter-exchange system, the first procedure for instructing the reception level measurement from the first circuit control station B before moving to the base station B in the destination adjacent zone, and receiving the reception level information of the first procedure, A second procedure in which the first line control station communicates the handoff decision information to the pseudo mobile station C in the adjacent zone, and a second procedure in which the pseudo mobile station C supervises the movement-destination base station to the second line control station A. Step 3 and the A second procedure in which the second line control station A sends the channel designation information to the first line control station B via the pseudo mobile station C, and the first line control station B sends the channel to the corresponding mobile station. And a fifth procedure for communicating designated information. 2. The base station comprises at least one or more receivers for receiving radio waves of mobile stations from adjacent zones connected to the pseudo mobile station. Inter-zone exchange method for mobile communication systems. 3. The radio communication trunk with a base station controlled by each line control station, and a telephone exchange function, and a telephone line and a subscriber line trunk are directly connected to each other. Inter-zone exchange method for mobile communication systems.