1. Method and device for retransmitting packet of mmt service, and retransmission request method and device

2. Method and device for transmitting uplink control information when retransmitting uplink data in wireless access system

3. Method and device for relay node retransmitting backhaul uplink to base station in a wireless communication system

4. The present invention relates to a wireless access system and further relates to various methods for transmitting uplink control information when retransmitting uplink data in a carrier aggregation environment (i.e., multiple component carrier environment).