| 摘要 |
An entity of a communications system transmits a segment conforming to a segment format comprising a data portion (420) and a header portion (410). The header portion includes a field for a sequence number (412) associated with data in the data portion, e.g., a sequence number of byte of data in the data portion. The transmitted segment also includes a segment transmission sequence number (416). A receiving entity receives the segment and transmits an acknowledgment reflecting the segment transmission sequence number (418). Responsive to receipt of such an acknowledgment, roundtrip time may be determined. Retransmission timing, e.g., a retransmission timeout RTO value, may be adjusted responsive to the determined round trip time. |
