Packet header compression

摘要

SN examine section 101 monitors transmission data by way of monitoring an SN per packet, compares the SN in a packet that is to be transmitted with the SN in an immediately preceding packet, and outputs the comparison result to CID selection section 102 with transmission data. CID selection section 102 selects a CID based on the comparison result output from SN examination section 101 and appends the CID to the transmission data, and outputs the transmission data to header compression section 104. CRC bit calculation section 103 calculates a CRC bit from the header information. Header compression section 104 determines on a header compression format, compresses a header that contains an SN and a CRC bit, and connects the header with transmission data and transmit this to transmission section 106. Transmission packet storing section 105 that stores transmitted packets.