JPS62204630A - Multi-channel access wireless telephone connection control method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Technical field) This invention is applicable to disaster prevention administrative radio systems, etc.

This invention relates to a multi-channel access radio telephone system in which several radio telephone systems share the same radio wave.

(Prior art and its problems) Figure 2 shows a distributed multi-channel access radio telephone system, where C is the control station for the entire system.
L, l, TJ2...Ln are the master stations of the system installed in each district, and terminal stations P, , P2...
Since a multi-channel access line is provided between the terminal and Pn, it is possible to select and use an empty radio wave from among a plurality of radio waves. In this case, for example, the terminal station P
4 to L+, L2...Ln When a call is made on a shared channel where radio waves are shared between each system, as shown by the dotted line in Figure 1, not only the master station of the own system but also the master station of the other system In many cases, calls are also detected. Also, if several systems make calls on the same channel, each will suppress the other's radio waves.
It becomes impossible to send and receive signals to connect the line.

(Purpose) In order to solve these problems, the master station that detects a call signal from a terminal station immediately activates its transmitter, so that even if another terminal station subsequently makes a call, it will not be interfered with. This is to prevent it from happening.

(Embodiment) The operation of calling a terminal station will be explained below using the embodiment of the present invention shown in FIG. (a) to ) are the operation sequences of the calling terminal station, and the rise of the signal in (a) indicates the start of the call operation. First, as shown in (b), the radio transmits. , check the timing when the master station is ready to receive reception (c)
The call signal shown in is sent out. →−Totaiji◇depart−゛
The master station that detects this call signal activates the transmitter not only of its own master station but also of other master stations, and when other terminal stations receive this radio wave, they are prevented from making calls on the same channel. do. (to) starts the transmitter of the calling terminal station's master station Lm, (
IJJ&! This shows activation of the transmitter of the master station Ln of another system. When the master station L□ of the calling terminal station completes receiving the calling signal (c) from the terminal station and identifies the call originating from its own system, it transmits the call to the other system through the control station, as shown in (e). A channel use prohibition signal is sent, and a response signal (g) is sent to one calling terminal station to permit use of that channel. When the calling terminal station receives this response signal (G), it sends out the own station number signal, etc., and when it receives the verification signal shown in (-F) from the master station, the line connection for the 9-call is completed. Subsequently, the called station sends and receives dial signals.

(Effects) According to the present invention, when a terminal station makes a call using a distributed multi-channel access system in which one radio wave is shared by several systems, there is no interference between terminal stations, so the call loss rate can be reduced. This is especially effective when calls are congested, such as during disasters.

[Brief explanation of drawings]

FIG. 2 is a distributed multi-channel access radio telephone system, and FIG. 1 is an operational diagram of a multi-channel access terminal station call origination, showing an embodiment of the present invention. C: Control station, L1 to L4: District control station (master station of multi-channel access system), P1 to P4 = terminal station, (a) to (
) is a time chart showing the operation sequence.

Claims (1)

[Claims] In a system in which a control station controls multiple multi-channel access radio telephone systems, monitors the use of radio waves shared among these multi-channel access radio telephone systems, and controls the use of the shared channels. When a terminal station makes a call, the master station in each system detects the signal and activates its transmitter, but if the call is not from its own terminal station, it immediately cuts off the transmission and transmits the signal from the terminal station. A connection control method for a multi-channel access radio telephone, characterized in that a channel caused by a call can be connected to a line without interference from others.