JPH04321340A - Radio data communication system - Google Patents

Abstract

PURPOSE:To quicken and facilitate the setting and revision of a communication path data in the case of communication by the contention system by sending a communication path data specific to its own terminal equipment to other terminal equipment. CONSTITUTION:Each of radio transmitters-receivers MOD provided to a terminal equipment N is provided with a storage means M storing a communication path data and a terminal equipment number and each of radio transmitters- receivers MOD provided to a communication repeater R is provided with a storage means M storing a relay number. Each terminal equipment N is provided with the storage means M storing the communication path data and the communication path data stored in the storage means M is referenced in the case of generating a header. The communication path data is sent from an optional terminal equipment N via a radio transmission line when the correction of a path is required due to system start or addition of the terminal equipment N and the communication repeater R. Other terminal equipment N receiving the communication path data stores the communication path data to the storage means M.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a wireless data communication system configured using low-power radio stations and weak radio stations.
The device is composed of a terminal device equipped with a storage means for storing communication route data, and a communication repeater that relays communication data signals between the terminal devices, and the communication route between the terminal devices is based on the communication route data. The present invention relates to a wireless data communication system that performs communication.

0002

2. Description of the Related Art This type of wireless data communication system is constructed by connecting terminal devices or repeaters via an exchange equipped with storage means for storing communication route data. The repeater is provided to ensure a communication distance since the transmission output is weak. The switching equipment generates communication data including a predetermined communication path according to the communication path data and controls communication between terminal devices or repeaters (Patent application No. 6).
3-147788). That is, a terminal device or a repeater relays or receives communication data based on communication route data included in the received data.

0003

[Problem to be Solved by the Invention] However, the above-mentioned conventional technology is not suitable for, for example, a premises wireless data communication system.
Communication control is performed using a polling/selecting method using a private branch exchange (PBX), and from the perspective of improving communication efficiency, the contention method (for example, the contention method developed by It is conceivable to use CSMA/CD (CSMA/CD method used in Ethernet). In this case, each terminal device is provided with a storage means for storing the communication route data stored in the private branch exchange, and each terminal device communicates according to the communication route data stored in the storage means. However, when it is necessary to set communication route data initially, or when the communication route data changes due to the addition of repeaters or terminal devices or route changes, the changed communication route data can be transferred to each terminal device. It is necessary to update and store it in a storage means. In this case, there is a drawback that it is extremely time-consuming for a person to travel to each terminal device installed at a location far apart from each other and perform settings and update work by accessing each terminal device individually. An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

0004

[Means for Solving the Problems] In order to achieve this object, the characteristic configuration of the wireless data communication system according to the present invention is as follows.
At least one of the plurality of terminal devices is configured to transmit communication path data unique to the terminal device to another terminal device, and the other terminal device that has received the unique communication path data transmits the unique communication path data to the other terminal device. The present invention is configured to store route data in the storage means.

[0005]

[Operation] Any terminal device accessed by a worker transmits communication path data unique to the other terminal device from that terminal device to another terminal device. The other terminal device sets and updates its own communication route data by storing the communication route data received at that time in the storage means.

[0006]

Therefore, according to the wireless data communication system of the present invention, a worker does not have to go to the installation location of each terminal device to set and update communication route data, and can perform the work freely (for example, by the worker). Since the communication path data of each terminal device can be set and updated by communication from a nearby terminal device, it has become possible to set and update the communication path data extremely quickly and easily.

[0007]

[Embodiment] An embodiment of the present invention will be described below. As shown in Figure 1, a local wireless data communication system (hereinafter referred to as “LA
N system) consists of terminal devices N (terminal numbers N1 to N6) such as personal computers and workstations, and communication relays R (relay numbers R1 to R3) that relay communications between these terminal devices N. It is equipped with a wireless transceiver MOD. Each wireless transceiver M
The OD is a radio station (hereinafter referred to as a "low power radio station") whose output is an antenna power of about 10 mW, and each radio transceiver MOD provided in the terminal device N stores communication route data and a terminal number. On the other hand, each wireless transmitter/receiver MOD provided in the communication repeater R is provided with a storage means M storing a relay number (set by a switch). Therefore, communication between the terminal devices N over a long distance is realized via the communication repeater R. The LAN system includes:
Communication is performed using the CSMA/ACK method, which is a type of contention method. That is, the terminal device N transmits data to the destination terminal device N when the line is idle, according to the communication path data stored in the storage means M using the frame format shown in FIG. , if crosstalk occurs due to simultaneous transmission from multiple terminal devices N,
A jam pattern is sent and then sent again after a random delay time.

[0008] The frame format includes a start of heading (SOH) indicating the beginning of the frame, a header (H) consisting of data such as the transmitting station, receiving station, communication route, and commands, and a start of heading that ends the heading and begins the text. It is composed of transmission control characters such as text (STX) and end of text (ETX) indicating the end of text. The header (H) includes the next destination address (H1), the number of retries (H2) that is added each time it is retransmitted and represents the number of retransmissions, the command (H3), the final destination address (H4), and the source address ( H5) and communication route data (H6). Data transmitted from the terminal device N specified by the source address (H5) using such a frame format is first received by the communication relay R corresponding to the destination address (H1). The communication relay R transmits communication route data (H6
), the next address after its own address is set as the destination address (H1), and its own address is set as the source address (H5). By repeating the above operations, data is transmitted from any terminal device N to the target terminal device N. In addition, data is returned from the target terminal device N to the source terminal device N using the communication route data (H6) received by the target terminal device N.
Reverse the order and send in the same way. For example, terminal device N
1 and the terminal device N6 (N1
, R1, R2, R3, N6),
The terminal device N1 sets and transmits a header (H) as shown in FIG. 3 to the communication relay R1. Communication repeater R1, which received the communication data, sends the following information to communication repeater R2.
A header (H) as shown in FIG. 4 is set and transmitted. Similarly, the communication relay R2 sets and transmits a header (H) as shown in FIG. 5 to the communication relay R3. moreover,
The communication relay R3 sets and transmits a header (H) as shown in FIG. 6 to the terminal device N6, so that communication data is transmitted from the terminal device N1 to the terminal device N6.

As described above, each terminal device N is provided with a storage means M storing communication route data, and the communication route data stored in this storage means M is referred to when generating the header (H). Ru. The communication route data is transmitted from any terminal device N via the above-mentioned wireless transmission path when the system is started or when the route needs to be modified due to the addition of a terminal device N or a communication repeater R. The communication data is transmitted using the communication path data transmission command "RLY". For example, in order to transmit communication route data from the terminal device N2 to all other terminal devices N, first set its own communication route data in the storage means M of the terminal device N2, and then follow the communication route data. The respective communication path data is transmitted to each terminal device N. As shown in FIG. 7, the communication route data transmitted from the terminal device N2 to the terminal device N1 is configured as text, and in this example, from the terminal device N1 to the terminal device N3 is transmitted via communication repeaters R1 and R2. Further, a notification that a communication path is set is transmitted from the terminal device N1 to the terminal device N5 via the communication repeaters R1, R2, R3, etc.

Another embodiment will be described below. In the previous embodiment, the CSMA/ACK method was used as the communication method, but any communication method may be used as long as the contention method is adopted. Therefore, the structure of the frame format is not limited to this and is arbitrary. The communication path does not necessarily need to include a repeater; the terminal devices may also serve as communication repeaters, or the communication path may be configured directly between terminal devices without going through a repeater. The terminal device that transmits the communication route data is not fixed but arbitrary. In the previous embodiment, a premises radio station was described among the small power radio stations defined in the Radio Law, but the present invention can be similarly applied to other specified small power radio stations and weak radio stations.

[0011] Note that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

[Figure 1] System configuration diagram

[Figure 2] Configuration diagram of frame format

[Figure 3] Configuration diagram of frame format

[Figure 4] Configuration diagram of frame format

[Figure 5] Configuration diagram of frame format

[Figure 6
] Frame format configuration diagram

[Figure 7] Configuration diagram of frame format

[Explanation of symbols]

M Memory means N Terminal device R Communication repeater

Claims (1)

[Claims] [Claim 1] Storage means for storing communication route data (
a plurality of terminal devices (N) equipped with M) and a communication repeater (R) that relays communication data signals between the terminal devices (N);
A wireless data communication system configured to perform communication between the terminal devices (N) through a communication path according to the communication path data, wherein at least one of the plurality of terminal devices (N) communicates with the other terminal devices (N). to the terminal device (N1) of that terminal device (
N1) The terminal device (N1) is configured to transmit unique communication route data, and the other terminal device (N1) that receives the unique communication route data stores the unique communication route data in the storage means (M). A wireless data communication system configured as follows.