Error control encoding system, method and device

Claim 2

An error control encoding method in data communication for monitoring an error rate of received data and for thereby adaptively changing frame length for data transmission and reception, said error control encoding method comprising the steps of: (1) transmitting transmission data encoded with use of a designated frame length to a communication channel (4), (2) decoding data received from the communication channel (4) for thereby detecting error information involved in the received data, (3) converting said error information to a form of information suited to the present processing and returning it to the original transmitting side, (4) receiving the error information from said receiving part for analysis and selecting an adaptive frame length in response to the analyzed result, and (5) framing erroneous data with use of said selected frame length for transmission while designating the frame length as a frame length for use in said step (1).

Claim 3

An error control encoding system according to claim 1, wherein said transmission data is encoded for. each frame unit, a prescribed number of a plurality of frames is being blocked and transmitted to the transmission channel (4), while any error involved in received data being detected for each frame, said error information being converted to a frame error rate involved in a block and thereby a frame length being selected.

Claim 4

An error control encoding system according to claim 1, wherein a bit error rate of the received block data is detected, said bit error rate being compared with a prescribed channel error rate for error decision of the received data, while a frame length being selected in response to said bit error rate for encoding.

Claim 5

An error control encoding system according to claim 2, wherein said error information includes a frame number and a NAK signal.

Claim 6

An error control encoding system according to claim 3, wherein said error information converted to the data format suited to the present processing includes a block number, a frame number and the NAK signal.

Claim 7

A mobile data communication device employing the error control encoding method for changing frame length based on the error rate of the received data for data transmission and reception, said mobile data communication device comprising: in a transmitting part, (1) a frame length memory for storing a plurality of different kinds of frame lengths (16), (2) a receiver (12) for receiving error information involved in received data transmitted from a remote receiving part, (3) a decoder (13) for decoding an output from the receiver (12), (4) a frame length selecting means (14) for selecting an adaptive frame length from the frame length memory (16) in conformity with error information being an output from the decoder (13), (5) an encoder (2) for encoding data delivered from a transmitting terminal (1) with use of the frame length selected by the frame length selecting means (14), (6) a transmitter (3) for transmitting the encoded data to a communication channel (4), and in a receiving side, (1) a receiver (5) for receiving data transmitted from a remote transmitting part, (2) a decoder (6) for decoding an output from the receiver (5), and delivering it to a receiving terminal (7) while detecting an error involved in the received data, (3) a data-making means for converting error information to a data format suited to the present processing in conformity with the error information from the decoder (6), (4) an encoder (9) for encoding said error information converted to the data, and (5) a transmitter (3) for transmitting an output from the encoder (9) to the remote transmitting part.

Claim 8

A mobile data communication device employing the error control encoding method for changing frame length based on the error rate of the received data for data transmission and reception, said mobile data communication device comprising: in a transmitting part, (1) a frame length memory for storing a plurality of different kinds of frame lengths (16), (2) a receiver (12) for receiving error information involved in received data transmitted from a remote receiving part, (3) a decoder (13) for decoding an output from the receiver (12), (4) a frame length selecting means (14) for selecting an adaptive frame length from the frame length memory (16) in conformity with error information being an output from the decoder (13), (5) an encoder (2) for encoding data delivered from a transmitting terminal (1) with use of the frame length selected by the frame length selecting means (14), (6) a transmitter (3) for transmitting the encoded data to a communication channel (4), and in a receiving side, (1) a receiver (5) for receiving data transmitted from a remote transmitting part, (2) a decoder (6) for decoding an output from the receiver (5), and delivering it to a receiving terminal (7) while detecting an error involved in the received data, (3) a data-making means for converting error information to a data format suited to the present processing in conformity with the error information from the decoder (6), (4) an encoder (9) for encoding said error information converted to the data, and (5) a transmitter (3) for transmitting an output from the encoder (9) to the remote transmitting part.

Claim 9

A mobile data communication device according to claim 3, wherein in encoding said transmission data for each frame and blocking a plurality of frames with a prescribed frame number for transmitting the blocked data in the communication channel (4), said decoder (6) of said receiving part detects involved error for each frame and thereby estimates a frame rate, said data-making means of the receiving part for converting any error information to a data format suited to the present data processing outputting data including an erroneous frame number and a NAK signal as error data.

Claim 10

A mobile data communication device according to claim - 6, wherein in encoding the transmission data for each frame, and blocking a plurality of the frames with a prescribed frame number for transmitting the blocked data to the communication channel (4), said decoder (6) evaluates a bit error rate of received block data and compares said bit error rate with a prescribed channel error rate, said data-making means for converting error information to a data format suited to the present data processing outputting data including the block number, error frame number, and NAK signal as error data to the encoder.

Claim 11

A mobile data communication device according to claim 6, wherein in encoding the transmission data for each frame, and blocking a plurality of frames with a prescribed frame number for transmitting the blocked data to the communication channel (4), said encoded error correcting codes comprising a plurality of kinds, each kind corresponding to each frame length.