Patent ID: 8531959
Filing Date: 2013-09-10
Classification: H04L

Abstract:
1. A method for sending ACK, used in a system including a sender and a receiver for transmitting data, said method comprising: when the receiver receives an I-frame from the sender that requires an ACK to be sent back to the sender, if the receiver has an I-frame to be sent to the sender, then sending, by the receiver, the ACK to the sender by the I-frame; otherwise, sending, by the receiver, the ACK to the sender by an S-frame; wherein the method further comprises: if there is an ACK timer that has been started, stopping or canceling the ACK timer when the receiver sends an ACK to the sender; increasing the ACK timeout value used next time when determining that the ACK is sent from the receiver to the sender due to timeout of the ACK timer; and decreasing the ACK timeout value used next time in at least one of the following situations: a) when determining that the ACK is sent from the receiver to the sender because difference between the receive window size and the number of the delayed ACK for I-frames is smaller than a predetermined threshold; and b) when the receiver sends the ACK back to the sender on receipt of a Poll frame from the sender.