Patent ID: 6970441

Claim:
A data transmission method in a digital cellular radio network, the method comprising: channel coding information to be transferred for transmission, the channel coding comprising grouping bits to be transmitted into blocks having the size of 290 bits; inserting 4 tail bits into the blocks; carrying out convolutional coding for said blocks with a Â½ code rate by employing GSM convolutional polynomes so that after the coding the block size is 588 bits; puncturing the coded bits obtained by deleting 132 bits from each block; transferring the information to be transmitted in a transfer system by generating a transcoding frame having a plurality of data octets, the first two data octets forming a synchronization pattern that consists of zeros, and said transcoding frame containing control bits and at least 288 bits of information to be transmitted; and calculating a short checksum for some of the data octets used for transferring the information to be transmitted, transferring a cyclic redundancy check value obtained by using spare control bits, and employing the cyclic redundancy check value in synchronizing of the transcoding frame.