Delayed acknowledgement transmission method and apparatus in mobile communication system

摘要

A delayed acknowledgement transmission method and an apparatus are provided for improving communication performance of a system and a terminal by delaying an ACKnowledgement (ACK) transmission of the terminal in a handover procedure. The method includes transmitting an acknowledgement corresponding to a segment immediately upon receipt of the segment, detecting a delay condition event which is triggered when a difference between a signal strength of the source base station and a neighboring base station is equal to or greater than a predefined offset, calculating a delay value for delaying acknowledgement transmission corresponding to the segment received after detecting the delay condition event, and transmitting the segment received after the detection of the delay condition event by delaying by as much as a time corresponding to the delay value. The apparatus is capable of avoiding a router's performance degradation and reducing a packet transmission delay and packet loss.

主权项

1. A method for transmitting an acknowledgement message corresponding to a segment by a terminal in a mobile communication system, the method comprising:
determining whether a difference between a strength of a first signal from a source base station and a strength of a second signal from a neighboring base station is equal to or greater than a predefined offset; calculating, if the difference between the strength of the first signal from the source base station and the strength of the second signal from the neighboring base station is equal to or greater than the predefined offset, a delay value based on a number of segments expected to be received until the terminal detaches from the source base station and based on a forwarding time to be taken for segment forwarding in a handover procedure between the source base station and the neighboring base station; transmitting an acknowledgement message to which the calculated delay value is applied in response to receiving a segment; and transmitting, when a delay termination event is detected, an acknowledgement message corresponding to a received segment without applying the delay value, wherein the delay termination event includes at least one of detecting an event A5 which is triggered when a signal strength of the source base station is equal to or less than a predefined first threshold value and a signal strength of the neighboring base station is equal to or greater than a predefined second threshold value, an event A2, which is triggered when a signal strength of the source base station is equal to or less than a threshold value, in state of an event A3 which is triggered when a signal strength of the neighboring base station is greater than a signal strength of the source base station and a difference between the signal strengths is equal to or greater than the predefined offset, and the event A3 in state of an event A4 which is triggered when a signal strength of the neighboring base station is equal to or greater than a threshold value, and wherein the calculating of the delay value comprises calculating the number of segments and the forwarding time and obtaining the delay value to be applied to the segment to be received based on the number of segments and the forwarding time.