METHOD AND APPARATUS FOR CRC RATE MATCHING IN COMMUNICATIONS SYSTEMS

摘要

Methods and apparatus are disclosed that provide for the use of cyclic redundancy check (CRC) rate matching for packets to be communicated in a packet based communications system. In an exemplary method, a packet including data (71) and a default CRC field (72) to be transmitted as a code word of length n at a code rate r is modified by extending the CRC field (72) by added bits (73) to form a new packet (75). The number of added bits for the extended CRC is determined by finding the largest value for extended CRC bits (73) that meets an inequality. A method for receiving the extended packet (75) as a code word is disclosed where the value for the added bits is determined, and a de-rate matching and decoding is performed. A CRC check of the calculated CRC for the received extended packet (75) and the transmitted CRC is performed to determine if a valid packet was received. Apparatuses for transmitting and receiving the CRC rate matching code words are disclosed.