JPS61225934A - Radio communication system - Google Patents

Abstract

PURPOSE:To prevent disturbance due to irradiation of a radio wave from a communication station whose validity of communication license is expired by providing a time channel in parallel with a common line channel. CONSTITUTION:A managing station uses a time channel 3 to broadcast always time information 5. When start of communication command is inputted to a communication equipment 11, a program is started, the information 5 is received by a transmission/reception antenna circuit 20, a transmission/reception changeover switch and a reception circuit 23 and stored in a T register 6 in a RAM 27 via a coding/decoding circuit 24. Then the content of the T register 6 is compared with a content of a T0 register 7 in a ROM 28 for storing communication party information. The communication equipment 11 uses a common line channel 2 to sent a request 10 to acquire a talking channel and the signal 10 is sent as a signal with a specific bit pattern by the control of a CPU 25. Thus, the access to a radio channel from a communication equipment whose validity of communication license is expired is prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a wireless communication system, such as a personal radio, which is assumed to be used by an unspecified number of stations with a communication license, and in particular, the present invention relates to a wireless communication system such as a personal radio, which is premised on the use of an unspecified number of stations with a communication license. This is related to preventing communication outside the validity period.

[Conventional technology]

FIG. 4 is a block diagram showing a conventional wireless communication system of this type. In the figure, tllVi is the entire wireless channel used in this communication system, (2) is a common line channel, and (4) is a channel between each communication station. A plurality of communication channels are assigned to a communication path, and in the example shown in FIG. 4, the communication channels are A, A2, . . . . n channels of An are provided. (10) is a request signal for acquiring a communication channel, (
11) is a communication device. A wireless channel (1) having multiple channels can be configured using either a time division method or a frequency division method, and this is called a channel multiplexing wireless communication system. When configuring, the part shown by (1) in FIG. 4 is one frame that is repeated periodically, and the frame synchronization signal can be considered to be inserted into a part of the common line channel (2), for example. .

The operation of the conventional system shown in FIG. 4 is well known and will be briefly described below. When the caller specifies the other party and inputs a communication start instruction signal to the communication device (11), the communication device (11) transmits a request signal (10) using the common line channel (2) and sends the request signal (10) to the other party. Negotiations are made with the communication device to acquire a vacant communication channel (4) among the communication channels (4).

If the communication channel At is acquired, then this channel Ait- is used to communicate with the other party.

[Problems to be Solved by the Invention] Each of the six communication stations has a communication license expiration date, but in the conventional system, the communication device 11) is request signal (
1 is transmitted, allowing a communicator who is not otherwise qualified to do so to communicate, causing a hindrance to the communications work of a communicator with proper qualifications, and also impeding the effectiveness of the communications license. There was a problem that it damaged the sex.

This invention was made in order to solve the above-mentioned problems, and its purpose is to obtain a wireless communication system that is controlled by a simple method so that communication is possible only within the expiration date of the communication license of a communication station. do.

[Means for solving problems]

In this invention, a time channel is set up in parallel with the common line channel, and the management station that manages the operation of each communication station uses this time channel to provide the current time, which is the basic information when determining the validity of a communication license. It was decided that each communication station would receive this broadcast and compare it with the time indicating the expiration date of the communication license stored in the station in advance to determine the validity of the communication license.

[Effect]

In the wireless communication system of the present invention, each communication station has a time T indicating the expiration date of its own communication license. and compares it with the current time T broadcasted on the time channel.
Since the common line channel is controlled so that it can be accessed only at a certain time T, there will be no interference from radio wave emission from a communication station whose communication license has expired.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In Fig. 1, the same reference numerals as in Fig. 4 indicate the same or equivalent parts, and (3) indicates the time channel 1slr used for broadcasting time information from the management station.
The time information broadcasted by (6) is the communication device (11)
+71 is a memory area where the time information (6) is received and stored (hereinafter referred to as T register), and +71 is a memory area where the license issuer stores the expiration date of the communication license at the time of issuance of the communication license (hereinafter referred to as To register). Then, the To register (
7) is composed of non-volatile memory elements, such as ROM
(read-only memory).

FIG. 2 is a block diagram showing the internal configuration of the communication device (11) shown in FIG. (23) is a receiving circuit, (24) is an encoding/decoding circuit,
(25) is a CPU (central processing unit), and (26) is a ROM.

(27) is RAM (random access memory), (2g
) is a ROM for storing communication party information, (29) is a speaker, and (3 is a microphone).

The operation of the communication device it (11) is controlled by the CPU (2B), and the program tit RO for this control is
M (26), intermediate data etc.
It is temporarily stored in M (27). The T register (6) shown in FIG. 1 is provided in the RAM (27), and the To register (7) is provided in the ROM (28) for storing communication party information. The correspondent information storage ROM (28) generally stores other information unique to the correspondent (for example, an identification number, etc.).

Signal form and CP of signals transmitted by radio channels
Since the signal forms of the signals processed in U (25) are different from each other, the encoding/decoding circuit (24) performs mutual conversion of these signal forms.

Figure 2 O(20), (21), (22),
(23), (29), (30), and (7) are well known in general wireless communication devices, so their explanation will be omitted.

FIG. 3 is a flowchart showing part of the operation of the communication device (11) shown in FIGS. 1 and 2.
(101 people (102), (103')% (104) indicate the respective processing steps.

The operation of the apparatus of this invention will be explained below. A management station (not shown) uses a time channel (3) to transmit time information (5).
) is constantly broadcast. When a communication start command is input from the communication party to the communication device (11) together with the communication partner's identification number, the program shown in FIG. Transmission/reception selector switch (21), receiving circuit (23)? After that, all the time information (5) is received and temporarily stored in the T register (6) in the RAM (27) via the encoding/decoding circuit (24) under the control of the CPU (25). Next, proceed to step (102) and register T register (6).
T in the ROM (28) for storing the contents and correspondent information. Compare the contents of register (7).

If the comparison result is T≧To, it means that the expiration date of the communication license has passed, so proceed to step (10).
The process branches to step 3), and the communication device (11) +1-It indicates that communication is not possible, for example by emitting a specific sound from the speaker (29), and ends the operation.

The comparison result is TNT. If so, it means that the communication license is valid, so the process branches to step (104).
The communication device (11) uses the common line channel (2) to send out a request signal (1) for acquiring a communication channel.This request signal (In) 11 is sent to the encoding/decoding circuit under the control of the CPU (25) (24), transmission circuit (22)
, transmission/reception selector switch (21), transmission/reception antenna (
20) For example, the signal is sent out as a signal with a specific bit pattern.

The operation after sending the request signal (1) is the same as the operation of a conventional wireless communication system, so a description thereof will be omitted.

[Effects of the Invention] As described above, according to the present invention, a function is realized for each communication device to stop communication after the expiration date of the communication license. Access to the wireless channel can be prevented, which is effective in reducing the traffic on the wireless channel and in fair use of communication licenses.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing the internal configuration of the communication device shown in FIG. 1, and FIG.
The figure is a flowchart showing part of the operation of the communication device shown in FIGS. 1 and 2, and FIG. 4 is a block diagram showing a conventional wireless communication system. (1) is the entire wireless channel, (2) is the common line channel, (3) is the time channel, (4) is the communication channel, (
51H time information, (7) is a To register, and (11) is a communication device. Note that the same reference numerals in each figure indicate the same or similar parts.

Claims (1)

[Claims] A channel multiplexing wireless communication system comprising a plurality of communication channels assigned to communication paths between communication stations and a common control channel used to control these plurality of communication channels. (a) The control channel includes a common line channel and a time channel, and the common line channel is used to determine the communication channel to be allocated between the communication stations, and the time channel is used to determine the communication channel to be allocated between the communication stations. A means for constantly broadcasting time information from a management station that manages the operation of each communication station; (b) a means for storing the time indicating the expiration date of its own communication license in each communication station; (c) a means for each communication station to use the above-mentioned time channel and allows the communication station to access the common line channel only when the received time does not exceed the time indicating the communication license expiration date stored in the communication station. A wireless communication system characterized by comprising means for controlling.