JPS5943857B2 - Mobile communication line control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides communication between a large number of mobile stations and fixed stations or other mobile stations using limited radio channels. The present invention relates to a line control method that reduces the probability of calling and makes effective use of wireless channels through efficient calling operations.

In general, line control methods include the already well-known localized circulation method using tone signals and non-localized circulation method, but since these methods use tone signals, it is not possible to stably transmit a large amount of data in a short time. Generally speaking, wireless channels are not differentiated into those used for control and those used for communication. Examples of using digital signals instead of tone signals have also been announced, but this method is based on the premise of handling a very large number of moving stations (for example, from 100,000 stations to several million stations). A dedicated radio channel is provided separately from the control channel for mobile stations to make calls. For this reason, it is efficient in systems that assume very large capacity mobile stations, but in systems with medium capacity of several thousand or tens of thousands of stations, the call volume is not large enough to require a channel dedicated to calling. , the wireless channel usage efficiency deteriorates accordingly, and the disadvantage is that the limited wireless channels are not used efficiently. Therefore, in the case of a line control system that uses digital signaling in a medium- to small-capacity system, it is more efficient in a medium- to small-capacity system to use the same radio channel for making calls and a communication channel as described above. Wireless lines can be used.

In order to make a call and a conversation on the same channel, a line control method different from the conventional method is naturally required. The present invention provides a line control system that can satisfy such requirements, and one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention,
1 is an antenna, 2 is an antenna duplexer, 3 is a receiver, 4 is a decoder, 5 is a storage device for storing callable channel number (hereinafter referred to as S-CH) information sent from a control channel; 6 is a random sampling circuit equipped with a random number generator and a temporary storage device, 7 is a control device for the entire logic, 8 is an encoder, 9 is a transmitter, and 10 is a synthesizer that generates frequencies for the transmitter and receiver.

Next, the operation will be explained. The mobile station always receives the control channel during standby, and the S-CH information sent from the base station control channel enters the receiver 3 via the mobile station's antenna 1 and antenna duplexer 2. A decoder 4 decodes the signal. In this case, since a plurality of pieces of S-CH information are sent out in succession, all of this information is temporarily stored in the storage device 5. Furthermore, since the communication channel is used by other stations one after another, the S-CH information changes one after another each time another station makes a call, so the contents of this storage device 5 are always updated to the latest information. ing. Now, when the mobile station attempts to make a call, one of the contents of the storage device 5 is extracted by the random extraction circuit 6 based on a command from the control device 7, and the frequency of the synthesizer 10 is set to the extracted channel. and enters a calling operation and talking state on that wireless channel. In this case, when the base station device receives a call from the mobile station, it stops transmitting the wireless channel number, adds a new channel number instead, and controls new S-CH information. Notify other mobile stations through the channel. The above explanation is shown in a timing diagram as shown in FIG.

A is the received output of the S-CH information sent from the control channel of the base station, L is the location information indicating the service area, and S1 to S6 are the S-CH numbers that the mobile station may make calls to. B is the timing when this mobile station attempts to make a call, C is the operation timing of the random extraction circuit 6, and D is the timing when the frequency of the synthesizer 10 is determined and the transmission output is set to ON. As described above, according to the present invention, in a medium to small capacity mobile communication system that does not require a wireless channel exclusively for making calls, the mobile station always stores the latest callable channel number and makes calls. When making a call, the calling channel is determined by randomly extracting one of the above channel numbers and setting the frequency of the synthesizer accordingly.
The probability that a plurality of mobile stations (more than one mobile station) make calls on the same channel is reduced, and efficient use of wireless channels is achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the mobile communication line control system of the present invention, and FIG. 2 is a time chart illustrating its operation. 1...Antenna, 2...Antenna duplexer, 3...Receiver, 4...Decoder, 5
...S-CH information storage device, 6...
Random extraction device, 7... Control device, 8...
...Encoder, 9...Transmitter, 10...
frequency synthesizer.

Claims (1)

[Claims] 1. It has a calling/speech channel and a separate control channel for sending a call from the base station to a mobile station or channel number information that can be called to the mobile station. The mobile station stores and updates all of the available channel numbers in the storage device once, and when the mobile station makes a call, randomly extracts one of the stored channel numbers. A mobile communication line control method characterized in that a calling channel is determined by setting the frequency of a frequency synthesizer.