METHOD AND SYSTEM FOR PERFORMING FAST CHECKSUM OPERATIONS IN A GPRS COMMUNICATION SYSTEM UTILISING TUNNELLING

摘要

Method for performing tunneling comprising the steps of, - receiving a first packet (J) having a first value (HC_J) sum stored control covering at least portions of the first packet, - encapsulating the first packet (J) to provide a header (K) to the first packet, - calculating a second value (dC_K) checksum covering at least portions of the header (K) but not covering portions covered by the first checksum, - calculating and assigning a third value (HC_K) checksum as a sum of complements one of the first value checksum and the complement of the second value checksum (III, V), - storing the value (HC_K) summation assigned control in the header (K), - transmit the packet (J, K) encapsulated.