JPH0475692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a paging method for a multi-channel access system.

[Technical background of the invention]

In recent years, as a type of mobile communication system, a system has been developed that applies the so-called multi-channel access method, in which each mobile station has multiple wireless channels in common and specifies an empty channel among these wireless channels for communication. has been done. For example, as shown in FIG. 1, this type of system includes one control station 1, a plurality of command stations 2,
It is composed of a large number of mobile stations 3, among which one command station 2 and a plurality of mobile stations 3 serve as a subscriber group 4.
It consists of Note that 5 in the figure indicates the service area of this system. The control station 1 is
Command station 2 and mobile station 3 serve as the center of the system.
Group 4 performs line control (accepting calls, detecting and specifying free call channels), and
It relays communication between the command station 2 and each mobile station 3 belonging to each mobile station. On the other hand, command station 2
is used, for example, as a base station established at each subscriber's business office, etc., and communicates with each mobile station 3 operated as its slave station via the control station 1. Further, the mobile stations 3 are mounted on a vehicle or the like, and, like the command station 2 described above, communicate with each other and with the command station 2 via the control station 1.

FIG. 2 shows the circuit configuration of the command station 2 and mobile station 3. As shown in FIG. In other words, these stations modulate various control signals such as call origination, response, etc., and speech signals in a modulator (MOD) 11, and then transmit them to a transmitter ( _Tx ) 1.
2, a receiving system that reproduces various signals received by the antenna 13 in a receiving section (R _x ) 14 and a demodulating section (DEM) 15, and a switch 16 that switches between these transmitting and receiving systems; A collation unit that collates the individual paging signal and the general paging signal reproduced by the receiving system with its own number stored in a memory (ROM) 17 in a collation circuit 18, and a control unit (CPU).
It consists of 19. This CPU19 is
It has a microprocessor as its main control unit, and performs predetermined transmission/reception control operations according to preset control procedures.

When communicating in such a system, the following procedure is used. Here, the most basic operation, the case where a mobile station is called from a command station, will be explained as an example. That is, the command station 2 enters a calling operation in response to a calling request from the operator, and sends out a calling signal using the control channel CC.

Upon receiving this calling signal, the control station 1 selects an empty channel from among the communication channels and sends out the designated signal. By specifying this channel, the calling command station 2
All communication channels of each mobile station 3 in the group to which this command station belongs are transferred to the designated channel.

When the designation of the communication channel is completed, the command station 2 first sends out the individual number signal of the other party's mobile station at regular intervals up to N times via the communication channel TC in the case of an individual call. Furthermore, this N
is a preset number of times.

On the other hand, the mobile station 3 receives the above-mentioned individual number signal, and if it matches its own number, returns a response signal, and then becomes ready to make a call.

When the response signal is detected, the command station 2 determines that the line with the partner mobile station has been established and becomes ready for communication.

As a result, a call is subsequently made between the command station 2 and the mobile station using the designated call channel TC. FIG. 3a is a timing chart showing an outline of the above control procedure. In the figure, A indicates a command station, and B indicates a mobile station.

On the other hand, in the case of so-called simultaneous paging in which the command station 2 calls all mobile stations 3, the command station 2
sends out a simultaneous ringing signal three times at regular intervals,
Thereafter, the communication becomes possible without monitoring the return of the response signal. On the other hand, when each mobile station 3 detects the simultaneous paging signal, it becomes ready for communication without sending back a response signal. FIG. 3b is a timing diagram showing the control procedure.

[Problems with background technology]

However, the above calling method has the following drawbacks. That is, if the command station 2 or the mobile station 3 makes an individual call when the line condition is poor, even if the individual call signal reaches the other station, a response signal from that station may not be received.
In such a case, the called station transitions to a ready state as shown in Figure 4B after sending the response signal, but the calling station transitions to a ready state as shown in Figure 4A after completing N individual calls. As a result, a state mismatch occurs between the two stations. If this state mismatch occurs, the call channel will be wasted until the called station returns to the standby state after a predetermined period of time has elapsed, resulting in a decrease in the efficiency of use of the call channel, which is undesirable. . Furthermore, if connection with the other party cannot be established as described above, the calling station must perform the calling operation again, which is extremely troublesome.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a calling method for a multi-channel access system that can increase the effective usage rate of communication channels and improve operability by eliminating the trouble of re-calling.

[Summary of the invention]

In order to achieve the above object, the present invention performs a simultaneous paging to all command stations and mobile stations in a group when no response signal from the other station is detected after the end of an individual paging, and sends a response signal after this simultaneous paging. The system transitions to a talking state without monitoring the return of the call.

[Embodiments of the invention]

FIGS. 5a and 5b are flowcharts showing a control procedure for a paging method in an embodiment of the present invention, and this control is executed by the CPU 19 of the command station 2 and each mobile station 3.

That is, in the case of an individual call, the CPU 19 first sets the call counter to "N", then outputs the individual number code of the other station and causes the transmission system to send it through the communication channel. After sending out this individual paging signal, it is determined whether or not a response signal from the partner station has been received by monitoring the output of the receiving system, and if it is received, the call operation is started in the same manner as in FIG. 3a. Transition.

By the way, if the reception of the response signal cannot be confirmed even after a certain period of time has passed according to the reception judgment of the response signal, the individual paging signal is transmitted up to N times including the first individual paging, A response signal reception determination is made for each of these individual calls. If no response signal is detected for the N-th individual call, a pre-stored general call number code is output to perform a general call. At this time, control of this simultaneous calling is performed according to the procedure shown in FIG. 5b. That is, the CPU 19 first sets the paging counter to "M", and then sends the simultaneous paging signal to M after a certain interval.
Send it repeatedly. Note that this M is a preset number of times. Then, at the time when the M-th transmission is completed, the communication state is established. Figure 6 shows
FIG. 3 is a timing chart showing the above control procedure.

That is, in the system of this embodiment, if no response signal from the partner station is detected in response to an individual call, a simultaneous call is immediately and automatically performed. Here, the sequence of simultaneous paging is as shown in Fig. 3b and Fig. 6, in which the calling station repeatedly sends out the simultaneous paging signal three times and then shifts to the communication state without monitoring the response signal. However, when the called station receives the paging signal three times, it is set so that it does not send back a response signal and immediately enters the talking state upon receiving the paging signal. Therefore, in the case of an individual call, for example, the calling station may not be able to receive a response signal from the called station due to deterioration in the condition of the wireless line, resulting in a mismatch in the states between the calling station and the called station. Even if this happens, this discrepancy in status can be resolved within a short time by performing the above-mentioned simultaneous call. Therefore, the wasteful usage time of the communication channel is reduced, thereby increasing the effective utilization rate of the communication channel. Furthermore, since the system is automatically switched to simultaneous calling, there is no need to perform a re-calling operation, and as a result, operability and handling can be improved.

Note that the present invention is not limited to the above embodiments, and the configurations and control procedures of the mobile station, command station, and control station can be modified in various ways without departing from the gist of the present invention. Further, as an applied example of the present invention, when a response signal is not returned to an individual call, a group call may be made to a predetermined plurality of specific stations instead of calling all stations.

〔Effect of the invention〕

As described in detail above, according to the present invention, when no response signal from the partner station is detected after an individual call is completed, a simultaneous call is made to all command stations and mobile stations in the group, and the response signal is then returned. A paging method for a multi-channel access system that increases the effective usage rate of call channels and eliminates the trouble of re-paging, thereby improving operability by transitioning to a communication state without monitoring. can be provided.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing an example of a multi-channel access system, Figure 2 is a circuit block diagram of a command station and mobile station, Figures 3a and b are timing diagrams showing a call control procedure, and Figure 4 is a conventional system. FIGS. 5a and 5b are flowcharts showing the control procedure of the paging method in an embodiment of the present invention, and FIG. 6 is a timing diagram showing the drawbacks of the paging method. 1...control station, 2...command station, 3...mobile station,
4...Group, 5...Communication area, CC...Control channel, TC...Communication channel.

Claims (1)

[Claims] 1. Consisting of one control station and a plurality of groups each consisting of a command station and a plurality of mobile stations, the control station receives a call signal from the command station or mobile station. control means for selecting an empty communication channel from among a plurality of communication channels and specifying this empty communication channel to each station in each group when Each mobile station sends an individual paging signal from the calling station to the called station with the empty communication channel specified above, and the called station responds when it receives this individual paging signal. An individual calling method in which a signal is returned and the communication state is shifted to using the above-mentioned free communication channel, and when the calling side station detects the return of this response signal, the communication state is shifted to the communication state using the above-mentioned free communication channel. , the station on the calling side sends a paging signal to the station on the called side, and when the station on the called side receives this paging signal, it shifts to the communication state using the above-mentioned vacant communication channel, and the station on the calling side The station is a multi-channel access system having a means for selectively using the simultaneous paging method to call the communication partner station after transmitting the paging signal and switching to a communication state using the vacant communication channel. The command station and each mobile station transmit the individual paging signal to any called station with the vacant communication channel specified, and after sending the individual paging signal, It is determined whether or not a response signal has been received from the calling station, and if reception of a response signal is not detected by this determination, all designated stations and mobile stations in the group including the called station A paging method for a multi-channel access system, characterized in that the paging method for a multi-channel access system comprises means for transmitting the paging signal to a user, and transitioning to a communication state using the vacant communication channel after the transmission of the paging signal is completed.