| 摘要 |
A communications protocol that communicates absolute state information, as contrasted to incremental information, on a regular basis to achieve high throughput by reducing the need for retransmissions. The protocol exchanges control messages that contain all of the relevant state information between the receiver and the transmitter on a frequent, routine and periodic basis, independent of any significant event that may have taken place in the receiver or the transmitter. The periodic rate of state exchange depends on the activity on the logical channel. The data communication from the transmitter to the receiver is in blocks of packets, with each block carrying a sequence number. Selective retransmission procedures are initiated by the transmitter whenever a control packet from the receiver identifies a failed reception. When a packet in a block fails to be received properly, the entire block, but only that block, is retransmitted.
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