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

摘要

Methods have been provided for accomplishing fast checksum operations for various nodes in a GPRS network. According to one embodiment of the invention a method is provided for performing tunnelling wherein, a first packet (J) is received having a stored first checksum value (HC J) covering at least portions of the first packet, and wherein the first packet (J) is encapsulated by providing a header (K) to the first packet. A second checksum value (dC K) covering at least portions of the header (K) but not covering portions covered by the first checksum is calculated and a third checksum value (HC K) is calculated and assigned. The assigned checksum value (HC K) is subsequently stored in the header (K), and the encapsulated packet (J, K) is transmitted.