JP2000324045A - Spectrum spread system radio data communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the effective communication speed of data transfer by giving redundancy by continuously transmitting the same value or an ID value calculated according to a certain formula, etc. SOLUTION: The radio data communication device comprises a storage part 2, a program part 3, a control part 4, a transmission part 5, a transmission control part 6, a reception part 7, and a reception control part 8 and a communication control procedure is mounted on the storage part 2 and program storage part 3. The ID information of a transmit frame of a transmitting station is composed of pieces N-1, N, and N+1 of successive data and an N-value left-bit shift + N + N-value right-bit shift (where N is a natural number and units of information are preferably 8, 16, and 32 bits). So that ID information constitution like this gives redundancy to incoming call radio station ID information that a transmitting station sends out and all radio stations recognize the incoming call ID with ease even if one bit or one information unit has an illegal character, a receiving station needs to securely and univocally determine the incoming call radio station ID.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread spectrum wireless data communication apparatus conforming to a domestic low power data communication system / wireless LAN system.

[0002]

2. Description of the Related Art In an SS wireless data communication apparatus using the GHz band in Japan, mutual interference is likely to occur when the frequency band originally has a large amount of disturbance noise, or in an environment where many wireless apparatuses using the same frequency band are operated. When a situation occurs in which interference occurs, there is a problem that data communication can hardly be performed.

[0003]

According to the present invention, a communication control procedure for performing data communication is provided even when a large amount of disturbance noise is present or when a relatively large number of terminals exist in the same area. A communication control procedure that improves the probability that a wireless device to receive is recognized as transmission data addressed to its own station, a communication control procedure that has a function to detect an error occurrence early during reception, and limits the occupation time of the corresponding radio frequency band during transmission An object of the present invention is to improve the effective communication speed of data transfer by using a communication control procedure to be performed.

[0004]

According to the present invention, in order to achieve the above object, the present invention transmits the same value a plurality of times or successively transmits an ID value calculated based on a certain formula when designating an own station ID and a receiving station ID. It has a configuration for providing redundancy, for example. The head of the data part, which is a communication message, is determined to have a predetermined command system value. Conventionally, each wireless device has been operated by suspending an arbitrary time generated by a random number in each wireless device at an interval, but by further providing an automatic pause function for forcibly prohibiting the arbitrary time transmission, a corresponding frequency band can be set. By providing a time interval that is not occupied, the time period for communication of other wireless devices is ensured so that coexistence of wireless systems can be achieved.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is configured so that ID information sent from a main station is converted into a redundant value and communicated to a receiving station side, so that it can be easily implemented. It is possible to calculate a correct receiving station ID, and it is possible to improve the noise resistance.

According to the second aspect of the present invention, if the frequency band to be occupied originally has a lot of noise, it is easy to cause interference with valid data being transmitted. If the command is not inserted and it does not correspond, the receiving station immediately ignores the subsequent received data, prepares a non-delivery response frame, and immediately transmits a non-delivery response to the transmitting station when transmission of one frame is completed. By doing so, retransmission can be performed without delay, so that the effective transmission rate can be increased.

The third aspect of the present invention is a control method which assumes that communication is still delayed even if the countermeasures described in the first and second aspects are implemented. When a large number of systems constituted by communication devices are operated in the same area, the reliability of the system can be improved by reducing the probability of mutual collision and attempting communication.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 shows a configuration of a wireless data communication apparatus according to Embodiments 1 to 3 of the present invention. In FIG. 1, the wireless data communication device includes a storage unit, a program storage unit, a control unit, a transmission unit, a transmission control unit, a reception unit, and a reception control unit. The communication control procedure of the present invention is mounted on a storage unit and a program storage unit.

Here, I in the transmission frame of the transmitting station is
The D information configuration is configured as follows. (1) N-1, N, N + 1 continuous data (information unit is preferably 8, 16, or 32 bits) (2) N value left bit shift + N + N value right bit shift (where N is a natural number) The above ID In the information structure, the called station ID information transmitted by the transmitting station has redundancy so that even if one bit or one information unit (two or more bits) is garbled, all the wireless stations can easily recognize the called ID. In order to be recognized, the receiving station must be able to uniquely determine the called station ID.

In (1), if any two of the three values are compared to obtain a correlation (± 1 or ± 2), a correct receiving station ID can be restored. The number of redundant IDs is 3 in this example, but may be more.

In (2), it can be determined if the original values assumed in any two value comparisons match.
In this example, the number of bit-shifted IDs is two, but the number may be three or more.

(Embodiment 2) FIG. 2 shows a communication control flow according to Embodiment 2 of the present invention. In the figure, the configuration of a transmission frame is usually as follows. Frame configuration: preamble + flag + control section + data section + CRC + flag + postamble (however, control section = terminal ID + command or response + data section) Here, the receiving station is arranged by placing the receiving terminal ID at the head of the control section. The control unit determines whether the terminal ID to be received is the self-ID based on the redundant ID information.

First, after the start of reception, a command in a received frame is extracted using a bit counter. The extracted commands are sequentially compared with a command list stored in advance in the storage unit of FIG. If the value is recognized as a command, the reception is continued and a CRC check is performed. If the reception is determined to be normal, an ACK is returned. If an error is detected, a NACK response frame is returned to the transmitting station. .

As a result, the receiving station, which normally had to wait until the CRC check, can notify the calling station of the occurrence of the error earlier using the radio wave non-occupation time zone, thereby shortening the transmission time of all communication data. It is possible to

Further, if a broadcast communication ID is previously determined in the system as the real ID, system information relating to all wireless data devices can be immediately notified. Also,
It is also possible to insert maker ID and product ID information in addition to the terminal ID as the contents of the control unit and multiplex them by the method shown in the figure.

(Embodiment 3) FIG. 4 shows a communication control flow in Embodiment 3 of the present invention.

In the figure, the communication error processing by data retransmission normally involves 1: 1 communication, and operates without any problem when the surrounding radio wave environment condition is good. Probability of attempting transmission at the same time with retransmission only when external disturbance noise is occurring, or when there are many systems composed of wireless data communication devices using the same frequency band operating in the same area Increases, causing mutual interference, which causes a problem that the effective speed of data communication is extremely reduced.

In this embodiment, under the above conditions,
Restrictions on transmission that are set beforehand by the manufacturer or set by the user are made to function dynamically. As a result, a vacant time of the corresponding radio frequency band is created to secure a time zone that can be used for communication with another system, thereby enabling a plurality of systems to operate in the same area.

FIG. 4 shows the "setting change process" in FIG.
The flow of the subroutine is such that when data collision occurs in a wireless section, each data communication device normally waits for transmission for an arbitrary time generated by a random number generator. Here, the transmission request is made again after monitoring the time described as “random time standby”.

However, in accordance with the surrounding wireless environment of the installation area, it is necessary to consider the necessity of stopping all the devices in the same system at the same time for coexistence with other systems. It has a function to prohibit transmission from all stations for some fixed value seconds. It is characterized in that the determination of the presence or absence of the transmission restriction is dynamically performed while actually operating.

With regard to "storage / update of communication history", the process of extending one frame length by one step when the error rate is continuously improved, that is, the return process when the radio wave environment is improved in a better direction is further performed. It is also possible to add.

[0023]

As described above, according to the present invention, the probability that data communication can be efficiently realized using standard hardware even in an environment where a wireless data communication apparatus is installed in an environment with a lot of disturbance noise can be increased. can get.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless data communication device according to Embodiments 1 to 3 of the present invention.

FIG. 2 is a communication control flowchart according to Embodiment 2 of the present invention.

FIG. 3 is a communication control flowchart according to Embodiment 3 of the present invention.

FIG. 4 is a flowchart of a “setting change process” subroutine in FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless data communication device 2 storage unit 3 program storage unit 4 control unit 5 transmission unit 6 transmission control unit 7 reception unit 8 reception control unit

Claims (3)

[Claims] 1. A wireless data communication apparatus for a spread spectrum wireless communication system compliant with a domestic low power data communication system / wireless LAN system, wherein wireless device ID information of a control signal section transmitted from a master station is notified to a receiving station side. A spread spectrum wireless data communication device, wherein the wireless device ID information is converted into a redundant signal. 2. A spread spectrum wireless data communication apparatus conforming to a domestic low power data communication system / wireless LAN system, wherein a predetermined command is inserted into a head position of a control signal section transmitted from a master station. A spread-spectrum wireless data communication apparatus, wherein a receiving station stops receiving data from the master station according to the content of the command and issues a retransmission request. 3. A spread spectrum wireless data communication apparatus conforming to a domestic low power data communication system / wireless LAN system, wherein a transmission time is dynamically limited or transmission for a fixed time is prohibited. Wireless data communication device.