JPS6125334A - Control information transmission system in automobile telephone system - Google Patents

Abstract

PURPOSE:To utilize effectively a radio channel by transmitting transmission control channel assignment information to a radio zone where the radio channel is used repetitively while being transformed to avoid the acquisition of a talking channel impossible for calling. CONSTITUTION:Radio base stations 101-104 forming radio zones 201-204 through a control line and talking lines 11-14 are connected to an automobile telephone set 1 to constitute a control information transmission system. Information converting sections 81, 82 are inserted between incoming control channel control sections 41, 42 of the incoming control circuit of the system and incoming control channel signal transmission/reception sections 61-68. Transmission control channel assignment information to a radio zone is eliminated by the information converting sections 81, 82 and 0 is transmitted instead. Then no transmission control channel of the radio zones 202, 203 is assigned to the radio zones 201, 204 to avoid the acquisition of the talking channel impossible for calling thereby utilizing effectively the radio channel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to an information transmission system for a call control channel in a car telephone system.

(Prior art) In a car telephone system, the information sent by the incoming call control channel is the same in all wireless zones, so if there is a wireless zone that repeatedly uses the wireless channel, other mobile devices may not be able to acquire the correct outgoing control channel.

This will be explained with reference to the configuration diagram of the car telephone system shown in FIG. In the figure, 201 to 704 indicate each wireless zone, which is a service area of each wireless base station 101 to 104. Each radio base station 101-104 is connected to the mobile telephone station 1 by a respective communication line 11-14.

Each mobile station normally receives call control channel allocation information for each zone sent by the radio base station through a call control channel, and stores the contents. Furthermore, the wireless base station constantly sends information to mobile devices on whether or not it is possible to make a call using the call control channel assigned to it.

FIG. 4 shows a conventional example of an incoming call control line. The incoming call control opening channel control units 4 and 42 are connected to a main control unit (not shown) via lines 31 and 32, and are also connected to incoming call control channel signal transmitting and receiving units 61 to 68. The incoming call control channel signal transmitting/receiving units 61 to 68 are further connected to incoming call control channel transmitting units 71 to 74.

Each incoming call control channel transmitter 71 to 74 is a transmitter assigned to each wireless zone, and sends outgoing control channel allocation information to each wireless zone.

When a mobile device makes a call, the mobile device first measures the electric field strength of the calling control channel for each stored zone assignment, captures the call control channel with the strongest level, and knows whether it can make a call.

Currently, wireless zones 201 and 204 are repeatedly using wireless channels, and channels 1, 2.3 are used, and channel 1 is assigned to wireless zone 7201 and channel 3 is assigned to wireless zone 204 as the transmission control channel. Suppose that If channel 3 is being used for a call in wireless zone 201 and there are four other reasons for making a call in the same zone 201, channel 1, which is the outgoing control channel of zone 201, is used as the outgoing control channel instead of channel 1, which is the outgoing control channel of zone 201. In this case, there is a possibility that channel 3, which is the official channel for transmission in zone 204, will be captured. Therefore, in that case, the mobile device cannot obtain information that it can make a call, and cannot make a call.

(Objective of the Invention) The object of the present invention is to transmit control information that does not capture a calling control channel that cannot be used even if there is a wireless zone in which a wireless channel is repeatedly used. It is possible to provide a method.

(Structure of the Invention) In order to achieve the above object, a control information transmission method in a car telephone system according to the present invention transmits channel allocation information for call control for each radio zone to all radio zones from a plurality of radio zones. In a telephone system that transmits on an incoming call control channel of the same frequency, an information converter for converting the incoming call control line that sends the outgoing control channel allocation information is provided. , and is configured to send different outgoing control channel allocation information to wireless zones where wireless channels are repeatedly used.

According to the above configuration, the object of the present invention can be completely achieved.

(Mr. Shio's side) Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

In FIG. 3, wireless zones in which wireless channels are repeatedly used are designated 201 and 204, as in the conventional example. In the wireless zone 201, the information that channel 3 is assigned to the outgoing control channel for the wireless zone 204 is deleted, and a signal with that part rOJKed is sent through the incoming control channel. At this time, the wireless zones 202, 2
03, there is a possibility that the information that channel 3 allocated to the wireless zone 204 is 0# is not received near the boundary with the wireless zone 201, or there is no problem because the information is unnecessary in this area.

Similarly, a signal is sent to the wireless zone 204 by deleting the information that channel 1 is assigned to the transmission control channel for the wireless zone 201 and setting that portion to "0".

Figure 1 shows channel information for incoming call control in each wireless zone 201.
．． Let's take an example where the data is sent to 202, 203, and 204. From the radio base station 101 in FIG. 3, the incoming call control channel information shown in
02, 103, and 104 transmit incoming call control channel information shown in ■, ■, and ■, respectively. For example, (AO)I) in the information indicates outgoing control channel allocation information for the zone 201.

FIG. 2 is a block diagram showing an embodiment of an incoming call control line configured according to the method of the present invention.

In the figure, the same components as in FIG. 4 are given the same reference numerals.

An information conversion unit 81 is provided between the incoming call control channel control units 41 and 42 and the incoming call control channel signal transmitting/receiving units 61 to 68.
．． 82 was inserted. The information conversion units 81 and 82 delete the transmission control channel allocation information for the corresponding wireless zone and insert roJ in its place.

In this embodiment, since the wireless zones 201 and 204 are not assigned the calling control channel 3.1, the mobile device in each zone makes a call.

It is possible to avoid a situation where the outgoing call control channel is captured during a call and the call connection fails.

(Effects of the Invention) As described in detail above, the present invention is capable of transmitting outgoing control channel allocation information to a wireless zone where the wireless channel is repeatedly used when the incoming call control channel is busy. When using a zone-assigned call control channel as a call channel, the problem of capturing a call channel that cannot be called has been avoided, so the effect is that the wireless channel can be used effectively. There is.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of channel information for incoming call control transmitted according to the method of the present invention, FIG. FIG. 3 is a block diagram of a car telephone system, and FIG. 4 is a circuit diagram of a conventional incoming call control line. 1...Automatic call exchange 11.12,13j4...Control line and call line 3
1.32...Control line 41.42...Channel control unit for incoming call control 61-68
...; Incoming call control channel signal transmitting/receiving section 71 to 74
. . . Incoming call control channel superstition devices 81, 82 . . . Information conversion units 101, 102, 103, 104 .
1.202%+03.204...Wireless Zone Patent Applicant NEC Corporation Representative Patent Attorney Hisashi Inoro 1 Figure 22 Figure 7 3 Figure

Claims (1)

[Claims] In a car telephone system that is composed of a plurality of wireless zones and transmits outgoing control channel allocation information for each wireless zone on an incoming call control channel of the same frequency for all wireless zones, the outgoing control channel allocation information is transmitted to all wireless zones. In a car telephone system configured to include an information converter for converting this ratio information in the incoming call control line to be sent out, and to send out different outgoing control channel allocation information to wireless zones where wireless channels are repeatedly used. Control information transmission method.