JP2000253097A - Wireless data communication control device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a communication control procedure for executing data communication most efficiently when a relatively large number of terminals are present in an installation area, thereby limiting a transmission distance, It is an object of the present invention to provide a wireless data communication control device that realizes high-efficiency data communication with a simple configuration by improving the number of retransmissions of data communication in wireless equipment in which a data transmission rate is specified. SOLUTION: By retaining history information of a surrounding environment in which a radio equipment is installed in an information recording unit, an optimum frequency channel and a communication data unit capacity are determined and selected from a communication database up to the previous time, so that more information can be obtained. Highly efficient data communication can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless data communication control device in a data communication radio equipment conforming to the domestic weak radio equipment standard.

[0002]

2. Description of the Related Art In a data communication application conforming to the domestic weak radio system, the center frequency can be set arbitrarily by a radio terminal device manufacturer, but since there is no dedicated frequency for control, communication is performed in a many-to-one system. In this case, when there is only one data communication channel and a plurality of terminals establish a link for communicating with the master unit at an arbitrary time, the probability that the corresponding channel is used by another terminal is high. A problem that communication cannot be started.

According to the present invention, a communication control procedure for executing data communication most efficiently when a relatively large number of terminals are present in the same area is provided, so that data transmission in a wireless terminal whose transmission distance is limited is provided. The purpose is to realize communication efficiently.

[0004]

In addition, a 400 MHz band, a 1200 MHz band, and a 240 MHz band specified in Japan.
In a wireless terminal compliant with the 0 MHz band data transmission wireless equipment standard, a wireless terminal compliant with the equipment standard uses a control channel to determine a channel number used for data communication between two wireless devices to establish a link. After the transmission, the frequency is changed to one data channel, the data is shifted, and the data communication is started. Therefore, if the reception level is carrier-sensed in the many-to-one configuration, if it is in use, random generation in the wireless terminal occurs. In general, the device is designed to pause for a certain period of time and issue a connection request again. (1) When the number of terminals in the use environment increases, the number of times until a link is established increases. Or (2) there is a problem that the retransmission waiting time for communicating a fixed amount of data increases and the effective data transmission speed decreases.

In the present invention, the use environment of the device is a radio environment specific to the installation location, and the characteristics of this environment are stored in the radio terminal equipment with a simple circuit and reflected in the next communication, so that the effective transmission speed is reduced. The purpose is to realize high data communication.

[0006]

According to a first aspect of the present invention, in a link establishment procedure in a data communication radio equipment conforming to the domestic weak radio equipment standard, a frequency to be used immediately before the start of transmission at the time of a call is called. Is a retransmission control algorithm that dynamically changes the retransmission waiting time interval and the amount of data communication unit after link establishment according to the number of retransmissions when it is confirmed that the network is not occupied. Has an effect that data communication conforming to the weak wireless communication standard system can be realized.

According to a second aspect of the present invention, there is provided a link establishment procedure for data communication in a wireless terminal equipment conforming to the data transmission wireless equipment standard for 400 MHz, 1200 MHz and 2400 MHz bands in Japan. In the communication control algorithm, it is possible to select the communication channel based on the corresponding history by storing the previous use channel history in the storage unit according to the radio wave condition of the installation location of the frequency channel to be used in accordance with the radio wave condition of the installation location of the facility In addition, since the communication control according to the radio wave environment of the installation place, which has been impossible in the related art, can be performed, the effective transmission speed can be increased as a result.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows the configuration of a wireless terminal device. In FIG. 1, the radio equipment 1 includes an information storage unit 2, a program storage unit 3, a control unit 4, a transmission unit 5, a transmission control unit 6, a reception unit 7, and a reception control unit 8. The retransmission algorithm, which is the key to the present invention, is installed in the information storage unit 2 and the program storage unit 3.

FIG. 2 shows a processing flow of the retransmission control method, and FIG. 3 shows a detailed flow of the retry processing in FIG.

In FIG. 3, reference numeral 21 denotes the repetition of the same processing in the conventional method, but the present invention is characterized in that the N-th processing is different processing.

Therefore, the number of retransmission processings N (N ≧
3) Or, by simplifying the processing contents, all or a part of the present invention can be mounted according to the target equipment specifications and prices.

In FIG. 3, in the first retry process, after the end of the process No. 20, the use state of the corresponding frequency band is simply carrier sensed for a certain period of time.

In the second process No. 20, the carrier sense unit time is shortened and carrier sense is performed a predetermined number of times at the same time, and it is periodically detected whether the frequency band is occupied or always occupied. The result is recorded in the information storage unit 2 of FIG. 1 as a database of an arbitrary format.

The contents of the recording data are periodically read from the control unit 4 and designed so that the radio always operates with the latest data.

Next time, after the radio is turned off, the previous installation environment information is read from the main recording unit, and the determination of the continuous communication time and the setting of the pause time can be initialized so as to be optimal for the place where the radio is installed. .

In the third process No. 20, the number of data transfer bytes per time is set to a minimum and a link is established so that data communication is performed intermittently. It is possible to solve the problem that a link cannot be established in a many-to-one connection system in which the number of terminals exceeds 30 in the same system.

In addition, if data communication in the third procedure can be realized without delay at an arbitrarily set number of times, a function of performing data communication by returning (recovering) to the default number of bytes is provided. Can also.

FIG. 3 shows a detailed flow of the retry process in the flowchart of FIG.

Embodiment 2 FIG. 1 shows the configuration of a wireless terminal device. In FIG. 1, the radio equipment 1 includes an information storage unit 2, a program storage unit 3, a control unit 4, a transmission unit 5, a transmission control unit 6, a reception unit 7, and a reception control unit 8. The communication control algorithm according to the present invention is installed in the information storage unit 2 and the program storage unit 3.

In any of the above radio wave environments, the frequency at which a link cannot be established can be reduced with a wireless device equipped with the link establishment procedure of the present invention. 4, the function can be realized by a simple circuit configuration, so that it is possible to construct a link suitable for a low-cost product such as a weak radio.

In FIG. 1, the configuration of the wireless terminal device can be a duplex (full duplex) or simplex (half duplex) wireless terminal device 1. The information storage unit 2, the program storage unit 3, the control unit 4, The transmission unit 5, the transmission control unit 6, the reception unit 7, and the reception control unit 8 can be configured.

FIG. 4 shows a processing flow of the control method.

[0024]

As described above, according to the present invention, data communication control suitable for the installation location of terminal equipment can be performed using simple hardware, and data communication can be realized even in a relatively poor environment. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of wireless equipment according to an embodiment of the present invention.

FIG. 2 is a retransmission control flowchart according to Embodiment 1 of the present invention.

FIG. 3 is a detailed flowchart of a retransmission process in the flowchart of FIG. 2;

FIG. 4 is a communication control algorithm flowchart according to Embodiment 2 of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 radio equipment 2 information storage unit 3 program storage unit 4 control unit 5 transmission unit 6 transmission control unit 7 reception unit 8 reception control unit

Claims (2)

[Claims] In a link establishment procedure in a data communication radio equipment conforming to a domestic weak radio equipment standard, when it is confirmed that a frequency to be used is not occupied immediately before starting transmission at the time of calling, the number of retransmissions is determined. A wireless data communication control device dynamically changing a retransmission waiting time interval and a data communication unit amount after a link is established. 2. In a link establishment procedure at the time of data communication in a wireless terminal equipment conforming to a data transmission wireless equipment standard in a 400 MHz band, 1200 MHz band or 2400 MHz band of a specified low power radio station in Japan, a frequency channel to be used is set to A wireless data communication control device capable of selecting a communication channel based on a corresponding history by retaining a previous use channel history in a storage unit according to a radio wave condition of an installation location.