| 摘要 |
A method of communicating datagrams between terminals (nodes) of a communications system. In systems operating over unreliable media redundancy check data ( 136 ) can be included in a datagram for use in verifying the integrity of the datagram when received ( 112 ) by a terminal; satisfactory receipt of the datagram can be confirmed by the receiving terminal issuing ( 128 ) a response datagram to the originating terminal, for example an acknowledgement. The present invention utilises the redundancy check data ( 116 ) of a received original datagram (which redundancy check data includes information on the identity of the originating terminal and the content of the datagram) in the generation ( 122 ) of new redundancy check data for the acknowledgement (or other type of response) datagram. The originating terminal receives ( 130 ) and processes ( 134, 138 ) the response datagram in conjunction with its own local record of the redundancy check data ( 136 ) of the original datagram. In this way, the present invention ensures the response datagram is compact in size whilst enabling the originating terminal not only to verify ( 138 ) the integrity of the response datagram but also to recognise ( 140 ) the response datagram as being the response to the original datagram.
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