JPH03280632A - Radio communication system - Google Patents

Abstract

PURPOSE:To attain data communication only between stations of its own system even when a same radio wave is outputted by adding an identification code to discriminate whether or not a system is its own system to each control code in a communication mode. CONSTITUTION:This system is applied to a private radio system or a special small power radio system utilizing a weak radio wave so as to transmit a data such as a character and a identification code 6 discriminating whether or not a system is its own system is added to control codes 5(5a)-5(5f) in the communication protocol at the communication mode and the resulting code is transmitted to an opposite station. Then the station receiving the code 6 discriminates the identification code 6 in the control codes 5(5a)-5(5f) and fetches a data only when the code is coincident with the identification code 6 of its own station. Thus, even when a same radio is outputted, the data communication is implemented only between the stations of its own system without being affected with decrease in an electric field strength or fading.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wireless communication system for performing data communication using, for example, a local wireless system or a specified low-power wireless system.

[Prior Art] For example, premises radio equipment and specified low power radio equipment are known as devices that transmit data such as text using weak radio waves. Although there are differences, the standards are very similar, so we will explain here using a local wireless device as an example.

The premises wireless device is located in the service area Sl as shown in Figure 2.
, a plurality of base stations A distributed so as to divide S2.
-D and service area Sl.

A plurality of mobile stations F-J moving within S2 and mobile stations F-J
A control station 3 monitors the location of the mobile stations F to J based on which base stations A to D they are using wireless lines with, and an upper station 4 of the user connected to the control station 3. The system consists of a plurality of systems 1 and 2, which connect base stations A-D and mobile stations F-J based on commands from a control station 3, and communicate with each other in communication mode. Data communication such as text is carried out in

Furthermore, a communication procedure up to actual data communication in this type of local area wireless device will be explained.

When performing data communication between a base station and a mobile station in a private wireless system, frequencies consisting of 10 types of data channels are used for both uplink and downlink, and one channel is used as a control channel. A multi-channel access method is used as the communication method, and each station always searches for an empty data channel, selects a data channel, and then uses a control channel to designate a partner station for data communication. If there is a response from the other station, the communication mode shown in FIG. 3 is entered for connecting a line and actually transmitting data. In the communication mode, first, a line control code ENQ for line connection is transmitted from the station that made the line connection request to the other station. As a result, when a response AK code is returned from the other station, a data link is established and a TEXT code indicating a series of information contents and an STX code for cuing up the information are transmitted to the other station.

When the information is received from the other station, an AK code in response is returned, the data link is terminated, and an E signal indicating a communication termination request is returned.
When the OT code is transmitted to the other station, the line is released and data communication is completed.

[Problems to be Solved by the Invention] By the way, in this type of local area radio and specified low power radio, since radio waves are used, they are affected by electric field strength, fading phenomenon, etc. However, in the conventional communication method described above, when a normal line is connected, a check is made to see if the system is the own system, but in communication mode after the line is connected, where data communication is actually performed, there is a check to see if the system is the own system. was not carried out. For this reason, for example, if data communication is being performed between base station A and mobile station F as shown in FIG. 2, and now base station A attempts to transmit an AK code to mobile station F, When another mobile station J approaches the base station A and enters the reception area 7, the mobile station J, which does not originally need to receive signals from the base station A, simultaneously receives the base station A at the same time as the mobile station F, which is the target of communication. A masking phenomenon occurred in which a signal (AK code) was received from

In addition, if base stations A-D or mobile stations F-J are outputting the same radio wave, the station with the stronger radio wave will receive this radio wave. There is a risk that data communication may be carried out between different base stations and mobile stations, resulting in a lack of reliability.
There was a problem in that incorrect information was transmitted to the upper station 4 via the control station 3.

Therefore, the present invention has been made in view of the above-mentioned problems, and its purpose is to prevent the localization of the own system from being affected by electric field strength, fading phenomenon, etc. even when the same 1itL is output. An object of the present invention is to provide an extremely reliable wireless communication system that allows data communication to be performed only between users.

[Means for Solving the Problems] In order to achieve the above object, the wireless communication system according to the present invention adds an identification code to each control code in the communication procedure in the communication mode to determine whether the system is the own system or not. The control code is transmitted to the other station, and the station that receives the code discriminates the identification code in the control code and captures the data only when it matches the identification code of its own station.

[Operation] When performing data communication, an identification code is added to each control code in the communication procedure in the communication mode to determine whether the system is the own system, and the code is transmitted to the other station. determines the identification code within the control code and captures data only when it matches the identification code of its own station.

[Embodiment] FIG. 1 is a diagram showing an embodiment of a communication procedure of a wireless communication system according to the present invention.

The wireless communication system according to this embodiment is applied, for example, to in-premises radios and specified low-power radios that transmit data such as text using weak radio waves.Here, we will explain the configuration when applied to horizontal radios. .

As explained in the [Prior Art] section, the local area wireless device is as shown in FIG. 2 (service area Sl).

A plurality of base stations A- distributed so as to divide S2
D, a plurality of mobile stations F~, J moving within the service areas Sl and S2, and the mobile station F depending on which base station A to D the mobile station FJ uses a wireless link between. - The system is configured with a plurality of systems 1 and 2 each consisting of a control station 3 that monitors the location 1 of J, and a user's upper station 4 connected to the control station 3. Based on the command, connect the line between base station A"-D and mobile station F-J,
In the communication mode, mutual data communication such as characters is performed.

After each control code 58 to 5f (excluding TEXT code 5e) in the communication mode when performing data communication between each base station A to D and mobile stations F to J, there is an identification code as shown in FIG. 6 is added. This identification code 6 is a system 1 in which base stations A-D and mobile stations F~, J are connected by line and perform data communication.
(2) This is a code for determining whether or not the base station A=D and the mobile station FJ have their own identification code 6 and the identification code 6 transmitted from other stations. It is equipped with means for comparison, and if the identification codes 6 match, it adds its own identification code 6 to the next control code 5 and transmits that code to the other station; if the identification codes 6 do not match, , the data at that time is excluded and data communication is prohibited.

Next, a communication procedure of the wireless communication system according to this embodiment will be explained, taking as an example a case where data communication is performed from a mobile station F to a base station A.

Normally, base stations A-D and mobile stations F-J are constantly searching for empty data channels. Then, when mobile station F searches for an empty data channel and selects a data channel, it specifies base station A using the control channel to perform data communication. As a result, if there is a response from base station A, the line between mobile station A and base station F is connected and the mobile station shifts to a communication mode for actually performing data transmission. In the communication mode, first, a line control code ENQ (5a) for line connection is transmitted from mobile station F, which has requested line connection, to base station A.

At this time, the line control code ENQ (5a) is followed by the identification code GN.

(6) is added, so base station A compares this transmitted identification code 6 with its own identification code 6, and when the codes match, it adds its own AK code to the response AK code (5b). The identification code GNo (6) is added and transmitted to mobile station F. Note that if the transmitted identification code 6 and the identification code 6 of the own station do not match, the transmitted data at this time is excluded.

Next, mobile station F receives the response AK code (
5b) is returned, the identification code 6 added to this AK code (5b) is compared with the identification code 6 of the own station, and when they match, a data link is established and a TEXT code ( 5d) and ST of cueing the information
X code (5c) is transmitted to base station A. At this time, the identification code 6 of the own station is added to the cueing STX code (5C). Base station A then receives information from mobile station F, and if the identification code 6 added to the STX code (5c) matches the identification code 6 of its own station, it will add the AK code (5e) of the response to its own station. It is transmitted to the mobile station F with an identification code 6 added thereto. When the mobile station F receives the AK code (5e) from the base station A and the identification code 6 added to the AK code (5e) matches the identification code 6 of its own station and the data link is terminated, it issues a communication termination request. EOT code (5
f) is added with its own identification code 6 and transmitted to base station A. Then, base station A receives the EOT code (5) from mobile station F.
If the identification code 6 added to the EOT code (5f) after receiving f) matches the identification code 6 of the own station, the line is opened and data communication is completed.

Therefore, in the communication system of the above-described embodiment, the identification code I-'' 6 provided after each control code 5 in the communication mode allows each station to always check whether the other station is its own system or not, even when there is no line connection request. In the monitored configuration, each station A-D, F-J does not perform data communication with any other station other than the partner station with the matching identification code 6, so each system 1,
Even if the communication areas of stations A to D are close to each other and are easily affected by electric field strength and fading phenomena, each station A to D.

The F-J can easily identify the partner station to which it is connected and transmit necessary data only to the designated station. For example, now in FIG. 2, base station A.

B and mobile stations F, G, and H belong to system 1, and base stations C and D and mobile stations I and J belong to system 2. Mobile station J of a different system makes a call to base station A, and the same When selecting the data channel to be used with the terminal number and transitioning to communication mode, base station A is connected to mobile station J.
Even if a line is connected to mobile station J and radio waves are received from mobile station J, identification code 6 determines whether or not the received radio waves are from the own system. Transmission of data from a certain mobile station J can be excluded.

By the way, in the above-mentioned embodiment, E S
C (Binary 5ynchronous Com
Although we have explained the case where HDLC (High 1 communication) is used, HDLC (High 1 communication) is a procedure for efficiently performing synchronous data transmission using frame transmission.
evel Data Link Control pro
cedures), start-stop synchronization, etc.

[Effects of the Invention] As explained above, the wireless communication system according to the present invention adds an identification code to each control code in the communication mode to determine whether the system is the own system or not. Even if the signal is being output, data communication can be performed only between stations of the own system without being affected by electric field strength, fading phenomena, etc.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of the communication procedure of the wireless communication system according to the present invention, Fig. 2 is a diagram showing an example of the system configuration of the premises wireless system, and Fig. 3 is a diagram showing an example of the communication procedure using the conventional premises radio system. FIG. 1.2...System, 5 (5a to 5f)...Control code, 6...Identification code, A-D...Base station, F~
J...Mobile station.

Claims (1)

[Claims] An identification code is added to each control code in the communication procedure in communication mode and transmitted to the other station to determine whether the system is the own system, and the station that receives the code identifies the identification code in the control code. A wireless communication system that captures data only when the identification code of the own station matches the identification code of the own station.