Method for assigning a response channel and reporting a reception result in a mobile communication system

摘要

A synchronous retransmission method in a mobile communication system supporting a multicast service wherein one response channel is assigned on a multicast service-by-multicast service basis, and a response signal is transmitted through the response channel only when at least one mobile terminal fails in decoding for a packet transmitted by the multicast service. Accordingly, the response signal is rapidly transferred to the packet transmitted by the multicast service, and overhead from to the response channel can be reduced.