JP2936891B2 - Inter-zone switching method for mobile communication systems - Google Patents

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 of 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. The present invention relates to an inter-zone switching method of a mobile communication system that switches while continuing communication between mobile stations moving while communicating between base stations controlled by different line control stations.

[0002]

2. Description of the Related Art Conventionally, this type of mobile communication system is a technology required for an automobile telephone system or the like.
FIG. 4 shows the configuration of an inter-zone switching system of this mobile communication system.
This will be described below. FIG. 4 shows base stations A, B, C, and D arranged in each zone, mobile stations A and C communicating within the zones of base stations A and D, and a zone of base station B from a zone of base station C. Mobile station B, base stations A to D communicating while moving to
, Radio transceivers A to D for wireless communication with mobile stations, receivers A, B1, C1, D for measuring received power in the own zone,
A line control station A that supervises the base stations A and B and controls a subscriber connection with the telephone switching network X, and base stations C and D
, And a dedicated line P, which relays information on mobile stations moving between zones, which will be described later, between the line control stations B and A, and a trunk line A, which performs similar subscriber connection control.
A telephone switching network X is connected to a line control station at B, and telephones A to J are connected to subscriber lines.

[0003] Next, the inter-zone switching method will be described by taking as an example the case where the mobile station B moves from the base station C to the zone of the base station B. In reality, the base station range controlled by the line control station is adjusted to the moving range of the mobile station to eliminate the need for tracking exchange (hereinafter referred to as "handoff"), or to provide different line control to base stations in a specific positional relationship. By installing base stations of a type that interpolates between zones that are collectively controlled by the stations, different circuit control stations perform overall control and handle the occurrence of handoff between base stations between the circuit control stations. As shown in FIG.
The line control stations A and B provide a dedicated communication line P for data communication and for bypassing communication between the different line control stations A and B for transferring the movement information of the mobile station B, and are required for handoff processing between the line control stations. The data communication is performed, and the line control station A, which is a new line control station, performs overall control using the communication dedicated line P, and connects to the base station B to realize handoff.

[0004]

In the above-described conventional inter-zone switching system of a mobile communication system, a data communication line required for handing off a base station controlled by different line control stations and a bypass line for bypassing are used. Since data communication processing is performed via the equipment of the communication line and the data communication line, there is a disadvantage that a dedicated line is required.

It is an object of the present invention to provide a handoff
Register the location of the mobile station to be handed off to the new circuit control station, set the channel to be used for communication at the new base station, transfer the telephone connected with the previous circuit control station to the new circuit control station on the communication path, and transfer to the mobile station Channel change instructions etc. are required,
To realize these processes by providing a pseudo mobile station near the zone adjacent to each base station and changing the connection between trunk trunks in the line control station to realize an inter-zone switching method that does not use a dedicated line. It is in.

[0006]

According to the present invention, there is provided an inter-zone switching system for a mobile communication system, comprising: 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. Between the base station in one zone and the base station in an adjacent zone when there is a telephone set via the telephone switching network connected to the line control station. In the inter-zone switching system of a mobile communication system for mutually communicating channel change, trunk switching information, etc., a first circuit controller before moving
B, it is installed in the adjacent zone base station B,
To the receiver C2 connected to the line control station B of the
On the other hand, a first instruction for measuring the reception level of the mobile station B is provided.
Means, and a first means for receiving the reception level information of the first means.
Of the other base station and the receiver D1 of the other base station.
From the base station C to the base station B
, And is located in the base station B,
Pseudo mobile station C connected to a line control station B by a control line.
A second means for instructing handoff decision information with respect to
A second line in which the pseudo mobile station C controls the destination base station B
Connection required for handoff to control station A via radio B
Third means for requesting, and the second line control station A
Via the pseudo mobile station C, the first line control station B is checked.
A fourth means for transmitting channel designation information, and a first line control
Your station B specifies the channel designation information to the corresponding mobile station B.
The handoff is realized by the fifth means shown.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration 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 this 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 zones of base stations B and C, respectively.

FIG. 1 assumes that mobile station B is moving from the zone of base station C to the zone of base station B.
Therefore, although not shown, the bases A and B also have a similar configuration and function. In FIG. 1, the first line control station B
Is a radio D and a receiver D arranged in the base station D,
Between the radio C and the receiver C1 and the line control station located in C
Receiver C2 located at base station B for handoff
The pseudo mobile station C is connected by a control line and a communication line.
You. Similarly, the second line control station A has a base station A
Radio A, receiver A, and radio located in base station B
For handoff between machine B and receiver B1 and the network controller
Control by receiver B2 and pseudo mobile station B arranged in base station C
They are connected by wires and connecting wires. FIG. 2 is a diagram
Radio equipment of base stations B and C having a configuration of zones 1 and 2
B and C communicate with the radio trunks 3 and 1 of the circuit control stations A and B.
Via a speech switch and a trunk trunk to the telephone exchange network X
Connection of the call signal connected to the telephone via the telephone exchange network X
A connection system is generally illustrated.

Next, the operation of this embodiment will be described mainly with reference to FIG. In the control procedure relating to the handoff, when the mobile station B moves away from the base station C, the reception level of the wireless device C at the base station C decreases. Therefore, the base station C notifies the line control station B of the reception level deterioration (S- 1). Line control station B, the receiver C of the base station C of the adjacent base station (base station B and the base station D in this case)
2. Instruct the receiver D to measure the reception level of the 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, and the line control station B determines a handoff from the base station C to the base station B (S-3). ). However, since the base station B cannot be directly controlled by the line control station B, the data of the mobile station B is sent to the pseudo mobile station C, and the base station B performs temporary location registration and calling (S-4). The communication partner at this time is a special number A (number corresponding to the subscriber line trunk A shown in FIG. 2) in the line control station B provided exclusively for handoff in advance.
Use Base station B that has received a temporary call from the pseudo mobile station
Then, the line control station A accepts the call from the new mobile station as a call, and calls the special number A of the line control station B via the telephone exchange network X (S-4). The circuit controller A, which has detected in the response of the telephone switching network that the special number A has been connected, (S-
5), a communication channel is selected for the pseudo mobile station C, and the channel is designated (S-6). The pseudo mobile station C that has received the channel instruction 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 suspends the communication path, 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 is connected to the subscriber line trunk A dedicated to handoff (S-9). The communication path in the line control station in this state is shown in FIG.
Shown in

With the above processing, the mobile station B-base station B-
A communication path of the circuit control station A-the telephone switching network-the circuit control station B-the circuit switching network-the telephone J is configured, and the base station C
Is performed.

In the description of FIG. 1 and FIG. 2, the connection between the telephone exchange network and the line control station is connected by a trunk trunk. In a small system, however, the line control station has a telephone exchange function. A system that is directly connected to a telephone through a subscriber line is also feasible.

[0012]

As described above, according to the present invention, the handoff between the base stations which are controlled by different line controllers is controlled without providing a dedicated line between the line controllers, especially in a new line controller. There is an effect that the handoff function can be processed as a normal call processing without any awareness of the processing.

[Brief description of the drawings]

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

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

FIG. 3 is a flowchart illustrating the operation of the present embodiment.

FIG. 4 is a block diagram of an inter-zone switching 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)

(57) [Claims] 1. A plurality of mobile stations and a plurality of base stations arranged in a plurality of zones, a plurality of line control stations for integrally controlling the base stations, and a telephone set via a telephone switching network connected to the line control station. A zone of a mobile communication system for mutually communicating channel change, trunk switching information, etc. with each of the line control stations controlling when the mobile station moves from a base station in one zone to a base station in an adjacent zone. In the inter-exchange system, a transfer from the first circuit control station B before the movement is performed.
The first line control installed in the adjacent zone base station B
For the receiver C2 connected to the station B by the control line,
First means for instructing the measurement of the reception level of the mobile station B;
Line control receiving the reception level information of the first means
The station B receives the reception levels of the receivers C1 and D of the other base stations.
Handover from base station C to base station B
And determines the first line control
With respect to the pseudo mobile station C connected to the station B by the control line,
Second means for indicating handoff decision information, and a pseudo mobile station.
C transmits to the second line control station A that supervises the base station B of the movement destination.
Third request for connection for handoff via radio B
Means, and the second line control station A comprises a radio B and a pseudo mobile station.
Channel designation to the first line control station B via C
The fourth means for transmitting information and the first line control station B
Fifth instructing the corresponding mobile station B of the channel designation information
And the means of realizing handoff by means of
Inter-zone switching system for mobile communication systems. 2. The system according to claim 1, wherein each of the base stations includes at least one receiver for receiving a radio wave of a mobile station from an adjacent zone connected to the pseudo mobile station. Mobile zone communication system. 3. The telephone line according to claim 1, further comprising a telephone switching function in addition to a radio unit trunk with a base station controlled by each of said line control stations, and directly connected to a telephone set by a subscriber line trunk. Mobile zone communication system.