Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
1999-01-19
2001-11-27
Chung, Phung M. (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
C714S751000
Reexamination Certificate
active
06324667
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a radio transmission method and a radio transmission device suitable for being applied to a case of transmitting various kinds of information by, for example, a radio signal for making up a local area network (LAN) among a plurality of appliances.
2. Description of the Related Art
In the past, when a local area network is set up among a plurality of video appliances, a personal computer device and its peripherals in a narrow range such as in a home, in an office and the like to make it possible to transmit data which are dealt with by those appliances, there is a case where data transmission can be carried out by radio transmission by connecting a radio signal transmitting/receiving device to each appliance instead of directly connecting respective appliances with a signal cable or something.
By making up the local area network with the radio transmission, there is no need for directly connecting among respective appliances with signal cables, thereby making it possible to simplify a system arrangement.
By the way, in a case where a local area network area is made up by using more than three units of radio devices, it has such an arrangement in which one unit of radio devices is designated as a control station and according to an indication by control data transmitted from the control station, a transmission path is secured for carrying out data transmission among respective appliances.
Here, a control channel, a control slot for transmitting control data and the like have such an arrangement prescribed by a radio transmission format and are made up such that generally the control data and other data are strictly discriminated when they are transmitted, and there has been a need that a receiving process of the control data and a receiving process of general transmission data are carried out by different processes.
Also, because the control data is data for securing the transmission path, there is a need that the control data is surely transmitted to respective appliances, but actually, the control data are made to be transmitted under the same condition as that of the other transmission data. As a result, a transmission system needs to be set up so as to transmit all of the transmission data including the control data on a transmitting path with a high quality. However, with respect to the transmission data except the control data, there is a case where a transmission error of, for example, video data, audio data and the like are negligible, but in a case of a transmission error of the control data, it is undesirable. Therefore, even in the case of transmitting the video data, the audio data and the like, there previously was a need for setting a transmission path in accordance with the transmission condition of the control data.
SUMMARY OF THE INVENTION
In view of the above point, an object of the present invention is to simply carry out the transmission process of the control data.
Also, another object of the present invention is to improve the reliability of the transmission of the control data.
According to first aspect of the present invention, there is provided a data transmission method in which data transmission among a plurality of communication stations is carried out as data with a predetermined packet arrangement and the transmission of the control data from a control station for carrying out an access control is also made to be carried out by the same predetermined packet arrangement.
According to the first data transmission method of the present invention, the control data and the other data are transmitted with a common packet arrangement so that a reception process of the control data and the other data can be made common on a reception side.
According to a second aspect of the invention, there is provided a data transmission method in which an error detecting code or an error correcting code is added to data to be transmitted among a plurality of communication stations before transmitting the data as well as an error detecting code or an error correcting code is independently added to the control data, which carries out the access control, before transmitting the control data.
According to the second data transmission method of the present invention, it becomes possible to stringently add the error detecting code or the error correcting code to the control data than to the other data.
According to a third aspect of the present invention, there is provided a data transmission method in which data to be transmitted among a plurality of the communication stations are transmitted as data which is made a predetermined packet arrangement and the transmission of the control data from the control station, which carries out the access control, is repeatedly carried out a plurality of times as the packet arrangement.
According to the third data transmission method of the present invention, it is possible to raise a possibility that the control data can be correctly received on the reception side due to repeated transmission of the control data.
According to a fourth aspect of the present invention, there is provided a data transmission method in which when the control data is detected by carrying out a decoding process of data in a header portion of a signal received by the communication station, a control process of a communication based on the control data is carried out and when it is detected that data other than the control data is transmitted, the decoding process of data which is transmitted continuously to the header portion is carried out and when the decoding processing can not be carried out, a resend demand is made to a transmission source station.
According to the fourth data transmission of the present invention, when the control data and the other data are transmitted as the same packet arrangement, each data can be properly processed and at the same time, when there is a case where the decoding of the received data can not be carried out, the data can be made to be transmitted again.
REFERENCES:
patent: 5345594 (1994-09-01), Tsuda
patent: 5430738 (1995-07-01), Tsuda
patent: 5638384 (1997-06-01), Hayashi et al.
patent: 5646941 (1997-07-01), Nishimura et al.
Chung Phung M.
Maioli Jay H.
Sony Corporation
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