Patent ID: 9455804
Filing Date: 2016-09-27
CPC Classification: H04L

Claim Text:
1. A packet retransmission method of a terminal, the method comprising: transmitting an uplink packet to a base station using a first resource in a contention-based access mode; receiving, if the base station fails decoding the uplink packet, a message requesting for a radio link control (RLC) retransmission transmitted by the base station; and performing the RLC retransmission in response to the message requesting for the RLC retransmission, wherein the performing of the RLC retransmission comprises initializing, if the message includes information indicating that the failure to decode the uplink packet is caused by an access collision of the uplink packet, the RLC retransmission by triggering a back-off timer, and initiating, if the back-off timer expires or if the message does not include information indicating that the failure to decode the uplink packet is caused by an access collision of the uplink packet, the RLC retransmission using a second resource.