| 摘要 |
<p>There is disclosed a GPRS tunnelling protocol header having an optional sequence number field, and including a sequence field to indicate whether the sequence number field is present in the header. A UMTS GPRS tunnelling protocol header comprises, in sequence: a version field; a payload type field; a sequence filed; a message type filed; a length field; a flow label field; and an optional sequence number field, wherein the sequence field indicates whether the optional sequence number field is present in the header. <IMAGE></p> |
