JPS63272234A - Automobile telephone system - Google Patents

Abstract

PURPOSE:To simplify the channel changeover during talking around the service area when a mobile station is subjected to control by two control stations in one radio zone. CONSTITUTION:A channel changeover exclusive zone is provided around the service area. The service areas S1, S2 are controlled respectively by control stations MCC1, MCC2. When the mobile station M2 starts its talking from a radio zone RZ11 and going to a radio zone RZ22 and the station enters a channel changeover exclusive zone RZH11 through the radio zone RZ11, the talking is continued by the talking channel changeover. In such a case, it is not required to provide any special line or control means between the control stations MCC1 and MCC2. In this example, since the station is already within the radio zone RZ22 when the talking is finished in the channel changeover exclusive zone RZH11, the outgoing/incoming call through the control station MCC2 is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a car telephone system, and particularly to channel switching control around a service area.

[Conventional technology]

Conventionally, when switching channels during a call in a zone around the service area of a mobile phone control station (hereinafter referred to as a control station), channel switching is performed by sending and receiving complex signals between control stations. However, in some cases, it was impossible to switch channels.

This will be explained with reference to FIG. In Figure 8,
General telephone subscriber A is a general telephone exchange EXI.

Control station MCCl, mobile station M1 via base station MBSII
Consider an example where you are talking to someone. At that time, the channel switching signal is transmitted via the control station MCC2, as shown in FIG.

In other words, when switching channels, the base station MBSI
I sends a channel switching request signal to control station MCCl. On the other hand, the control station MCCl is connected to the base station MBSII.
It sends an electric field monitoring request signal to the surrounding area and control station MCC2. The control station MCC2 also sends an electric field monitoring request signal to the base station in the adjacent zone. Control station MCClσ Ground station MBSI
I. Receive a response signal from control station MCC2 and find the zone with the maximum electric field, which is the other control station zone.

For example, in the zone of control station MCC2, control station MCC2
send a channel request signal to. The control station MCC2 sends a transmission activation signal to the base station MBS22 with the largest electric field, and
A response signal is sent to CCl. In response to this, control station MCC
At l, a channel designation signal is sent to mobile station M1.

Then, a line confirmation signal is exchanged between the mobile station M1 and the base station MBS22, and the base station MBS22 sends a communication path switching signal to the control station MCC2, and the control station MCC2 sends a communication path switching signal to the control station MCCl to switch the communication path. A switch is made.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional car phone system.

A control line is required to transfer signals between control stations, and the control is complicated and requires a lot of processing, and the time required to switch between two communication channels is also disadvantageous.

[Failure to solve the problem]

The present invention provides a mobile telephone system that has a wireless channel divided into a control channel and a speech channel, and a service area divided into several wireless zones, by installing a plurality of mobile telephone control stations and One radio base station has a communication channel and a control channel for switching channels during calls between the plurality of car telephone control stations, and performs call/receive connection with the main car phone control station, and A car telephone control station is characterized in that it only controls channel switching during a call from its subordinate car phone control station.

[Effect]

Configure it so that you can receive it. Then, it performs call/receive control with the main control station to which that wireless zone belongs. Control from the control station of the adjacent service area only controls channel switching with the adjacent service area. A switch allows the communication transceiver in that zone to be connected to the main control station or to an adjacent control station. Then, which one is connected is sent to the control station by a signal equivalent to the SQ signal.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a detailed explanatory diagram of the present invention. Within service area S1, a car telephone control station (hereinafter referred to as control station) M
Calls can be freely connected under the control of CCI.

Part A around the service area S1 is included in the wireless zone RZI and is under the control of the wireless base station MBSI.

Mobile AM1 that started a call within A section is connected to wireless base station MBS.
It is connected to the general telephone switched network PSTN via I and control station MCCl. When the mobile station M1 moves towards the outside of the service area S1, it will be out of the service area S1 in a short time, but it will not be able to access the dedicated channel switching zone RZ during a call.
By switching the channel during a call to enter HI, the call can be continued on the call channel assigned to the υ channel switching exclusive zone RZH1.

FIG. 2 is a configuration diagram of the wireless base station MBS. PTRX is a channel for controlling incoming calls, ATRX is a channel for controlling outgoing calls, and VTRX is a channel for calls. SRX is a monitor receiver used for channel switching during a call. Wireless base station M in service area S1
The BS includes all the functions as shown in Figure 2 (a), but the channel switching dedicated base station MBSHI in the channel switching dedicated zone RZHI outside service area S1 has only one function for calls as shown in Figure 2 (b). Only channel VTRX and monitor receiver SRX are installed.

FIG. 3 is a control flowchart of the present invention.

As can be seen from this flowchart, it is not necessary to use the incoming call control channel PTRX and the outgoing call control channel ATRX for channel switching during 9 calls.

Also, in this flowchart, when the call ends at the channel switching dedicated base station MBSHI, the service area is S1.
This indicates that calls cannot be made or received because there is no control channel P-CH for calling.

FIG. 4 shows a specific example of application of the present invention. Service areas S1 and 82 are respectively control stations MCCl.

Controlled by MCC2. In the case of mobile station M2 starting a call from radio zone RZII and heading towards radio zone RZ22, when it exits radio zone RZII and enters channel switching dedicated zone RZHII, the call is continued by switching the channel during the call. At this time, no special line or control procedure is required between the control station MCCl and the control station MCC2. In this example, when the call ends in the channel switching exclusive zone RZHII, it is already in the wireless zone RZ22, so the control station MC
It is possible to make and receive calls through C2.

In the system shown in FIG. 4, it is possible to install the wireless base station MB S 22 and the channel switching dedicated base station MBSHII in the same station building. At this time, base station antenna A
It is clear that it is possible to share the NT and create a configuration as shown in FIG.

In FIG. 5, the radio channels controlled by control stations MCCl and MCC2 are set independently.

Wireless channel usage efficiency is poor.

FIG. 6 shows an example of the configuration of a base station having a radio channel controlled by both control stations MCCl and MCC2 in order to increase radio channel usage efficiency.

The communication channel VTRX is controlled by control stations MCCl and MCC2.
The switch SWI can be controlled from either side.
is installed.

FIG. 7 is a detailed diagram of switch SWI.

MCCITXAF and MCC2TXAF are the transmission audio signals from the control station MCC, MCCITXON, and
MCC2TXON each.

This is a transmission activation signal from the control station MCC. The input audio TXAF to the transmitter is switch 5W111 or 5W112.
When turned on, it is connected to control station MCCl or MCC2. The condition for connecting the input audio TXAF to the control station MCCl is when the transmission activation signal MCC2TXON indicates that transmission is stopped and the transmission activation signal MCCITXON indicates that transmission is activated.

Direct transmitter activation signal TXON is transmission activation signal MCC
Indicates transmission activation when either I TXON or MCC2 TXON is present. The audio signal RXAF from the receiver is sent to the control station MC through switch 5W121 or SWI 22.
The audio signal to Cl or MCC2 becomes MCCI RXAF or MCC2RXAF.

The switch 5W121 is interlocked with the switch 5WILL, and the switch 5W122 is interlocked with 5W112.

Receiver's electric field signal RXS Q is the control station MCC on the other side
The received signals MCClRXSQ and MCC2RXSQ of each control station MCC are obtained by performing a logical sum with the TXON signal from the control station MCC.

When the control station MCCl is using this radio channel, the received signal MCC2RXSQ is on, so the control station MCC2 knows that the channel is in use and does not use that channel.

〔Effect of the invention〕

As explained above, by receiving control from two control stations in one wireless zone, it is possible to easily switch channels during calls in the vicinity of the service area, making control easier.

[Brief explanation of drawings]

4 is a flowchart for explaining the operation of the embodiment of the present invention, and FIG. 4 is a diagram showing an application example of the present invention. FIG. 5 is a block diagram of another base station according to the present invention, FIG. 6 is a block diagram of yet another base station according to the present invention, FIG. 7 is a detailed diagram of switch SW1 in FIG. 6, and FIG. 8 is a conventional FIG. 9 is a flowchart for explaining the operation of the conventional example. In the figure, 81: Service area, MCCl, MCC2:
Car telephone control station, MBSI to MBS3: Wireless base station. RZI to RZ3: Wireless Sea Y, MBSHI: Base station dedicated to channel switching, RZHl: Zone dedicated to channel switching. Figure 1: Figure 2: Figure 5: Figure 6: W117

Claims (1)

[Claims] 1. In a car telephone system having a radio channel divided into a control channel and a speech channel and a service area divided into several radio zones, a plurality of car telephone control stations are installed, One wireless base station within a service area has a communication channel and a control channel for switching active channels between the plurality of car phone control stations, and makes and receives calls from and to the main car phone control station. A car telephone system characterized in that a subordinate car telephone control station only controls channel switching during a call from the subordinate car telephone control station. 2. The car telephone system according to claim 1 is characterized by having a switch that determines whether the wireless transceiver is connected to a main car phone control station or a secondary car phone control station. Car phone system. 3. In the car telephone system described in claim 2, the communication channel used by one car phone control station is detected in the same manner as if the other car control station has radio waves. A car telephone system characterized by: