JPH01147928A - Multi-channel access communication system - Google Patents

Abstract

PURPOSE:To prevent communication service from being biased to a specific group by applying communication limit between mobile stations belonging to the group based on the communication number of times per unit time for each group. CONSTITUTION:When a detection means 11 uses its monitor function 11b to detect it that the count of number times of communication of a group, e.g., a group A exceeds a prescribed value, a line controller 5a does not generate a channel designation signal even with a call from mobile stations 8a1-8an in the group A and sends a signal informing the all busy state of communication channels to limit the communication of the group A. The line controller 5a keeps the processing of communication limit by the sequence for a prescribed number of times executes the normal processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to call restriction in a multi-channel access (hereinafter referred to as MCA) communication system.

It is something.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional MCA communication system. In the figure, l is a monitoring device, 2 is a DC branching device, 3 is a dedicated line connecting this monitoring device l and the DC branching device 2,
4 is a modem (hereinafter referred to as a modem) disposed between the monitoring device 1 or the DC branching device 2 and this dedicated line 3; 5a and 5b are a plurality of line control devices connected to the DC branching device 2; 6a and 6b are control transmitting and receiving devices connected to this line control device 5a or 5b, and 7a+ to 7
an.

7b and 7bn are call transmitting/receiving devices 8 connected to each of the line control devices 5a or 5b in plural numbers;
at~8an, 8b+~8bn, 8c, ~8c
n, 8d, to 8dn are mobile stations of groups A to D, 9a,
9b refers to these mobile stations 8a+ to 8bn or 8c+ to 8
A control channel set between dn and the control transmitting/receiving device 6a or 6b, lOa+-10an,
10b+~lObn are the mobile stations 8a,~8b
n, 8 C1 to 8 dn and the telephone transmitting/receiving device 7a
, ~ran, 7b, and ~7bn.

Next, the operation will be explained. Now, for example, when the mobile station 8a in group A makes a call, the calling signal is received by the control transmitting/receiving device 6a via the control channel 9a and sent to the line control device 5a. Line control device 5 that received it
a is the currently available communication channel, e.g.
It searches for Oa+, generates a channel designation signal designating the communication channel 10a1, and sends it to the control transmitting/receiving device 6a. The control transmitting/receiving device 6a transmits this channel designation signal to each of the mobile stations 8at to 8an of group A using the control channel 9a. Each mobile station 8a, to 8an of group A, which has received this channel designation signal, adjusts its own transmission and reception frequency to the frequency of the designated communication channel. Hereinafter, the mobile station 8a+ and other mobile stations 8a of group A,
~8an enters a call state using the designated call channel lOa+ via the corresponding call transmitting/receiving device 7a.

On the other hand, each line control device 5a, 5b is a DC branch device 2.
are connected to a monitoring device 1 via a modem 4 by a dedicated line 3, and this monitoring device 1 constantly monitors the operating status of each of the line control devices 5a and 5b.
It's in control.

[Problem that the invention seeks to solve]

Since the conventional MCA communication system is configured as described above, when the number of calls of a particular group, for example, group A, increases,
As a result, a situation occurs in which call requests from mobile stations 8b, -8dn of other groups B to D are not permitted, resulting in a problem that call services are biased toward a specific group.

This invention was made to solve the above-mentioned problems, and aims to obtain an MCA communication system in which the call service is not biased towards a particular group by averaging the number of calls between each group. purpose.

[Means for solving problems]

The MCA communication system according to the present invention includes a detection means for counting the number of calls per unit time for each group and detecting when the counted value exceeds a predetermined value. If it is detected that the value has been exceeded, calls between mobile stations belonging to the corresponding group are restricted.

[Effect]

In the MCA communication system of the present invention, when the detection means detects a group in which the count of the number of calls per unit time exceeds a predetermined value, the line control device limits calls between mobile stations belonging to the group; Average the number of calls between each group.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a monitoring device, 2 is a DC branching device, 3 is a dedicated line, 4 is a modem, 6a and 6b are control transmitting/receiving devices, and 7
a+ to 7 an, 7 b+ to 7 bn are transmitting/receiving devices for communication, 8 a and 8 dn are mobile stations, 9 a and 9 b are control channels, and 10 a and 10 bn are communication channels, which are the same as shown in FIG. Since these parts are the same as or equivalent to the conventional ones with reference numerals, detailed explanation will be omitted. Further, lla is a counting function that counts the number of calls per unit time for each group, Itb is a monitoring function that monitors whether the counted value of this counting function 11a exceeds a predetermined value, and 11
5 is a detection means consisting of the counting function 11a and the monitoring function 11b, and 5a and 5b are different from conventional line control devices in that they include the detection means 11 inside.

Next, the operation will be explained. Now, mobile station 8a in group A,
When a call is made, a calling signal is sent to the control transmitting/receiving device 6a through the control channel 9a, and from the control transmitting/receiving device 6a to the line control device 5a, as in the conventional case. Based on this, the line control device 5a sends out a channel designation signal that designates a vacant call channel, for example 10a+, and further increments the counting function 11a of the detection means 11 to calculate the number of calls for the group A. " in the count value
1" is added. The sent channel designation signal is sent to the control transmitting/receiving device 6a, and the channel designation signal is added to the control channel 9a.
It is transmitted to each mobile station 8a, to 8an of group A. Thereafter, as in the conventional case, the mobile station 8a+ and the other mobile station 8at of group A
~8an sets its own transmitting/receiving frequency to the frequency of the designated communication channel IOa, and enters a talking state via the corresponding communication transmitting/receiving device 7a.

Here, the count value of the number of calls corresponding to each group of the counting function 11a is calculated by the line control device 5a as described above.

Each time 5b generates a channel designation signal, it is incremented by "1" and is reset every predetermined time (for example, 1 hour), and the count value corresponding to each group is determined by the detection means 1. The monitoring function 11b monitors whether a predetermined value, for example, "20" has been exceeded. The detection means 11 detects a certain group, for example A by its monitoring function llb.
When detecting that the count of the number of calls in the group exceeds the predetermined value of 20°, the line control device 5a will no longer generate a channel designation signal even if there is a call from the mobile stations 8a+ to 8an in group A. Instead, it sends a signal indicating that all call channels are busy and restricts calls for group A. After the line control device 5a continues the call restriction process according to this sequence a predetermined number of times, for example, five times, , the corresponding A of the counting function 11a
Resets the call count for the group and performs normal processing for subsequent calls.

In addition, in the above embodiment, the reference value for restricting calls is set to 20 times/
The case has been described in which the reference value for canceling the time and call restriction is set to 5 call restrictions, but each of these reference values may be set arbitrarily depending on the call status and traffic volume of each group.
The same effects as in the above embodiment are achieved.

〔Effect of the invention〕

As described above, according to the present invention, calls are restricted between mobile stations belonging to each group based on the number of calls per unit time for each group. When the number of calls increases, calls are restricted in that group and the number of calls between each group is averaged, which has the effect of providing an MCA communication system in which call services are not biased towards a particular group.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an MCA communication system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional MCA communication system. 5a and 5b are line control devices, 8a+ to 8dn are mobile stations, 9a and 9b are control channels, f Oa, to I Ob
n is a communication channel, 11 is a detection means, lla is a counting function, and llb is a monitoring function. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (2 others)

Claims (1)

[Claims] In a system composed of a plurality of groups of mobile stations, in response to a call originating from the mobile stations each having a different group code, a line control device searches for a communication channel that is vacant at that time. , by specifying the communication channel using a control channel, and each of the mobile stations in the group to which the calling mobile station belongs adjusts its transmission and reception frequency to the frequency of the specified communication channel, In the multi-channel access communication system that enables calls between mobile stations within the same group, the number of calls per unit time for each group is counted and it is detected whether the counted value exceeds a predetermined value. The multi-channel multichannel device is characterized in that the line control device is provided with a detection means for detecting that the counted value exceeds the predetermined value, and when it is detected that the counted value exceeds the predetermined value, the line control device restricts calls between the mobile stations belonging to the corresponding group. Access communication method.