Patent ID: 8730889
Filing Date: 2014-05-20
Classification: H04L,H04W

Abstract:
1. A method of retransmitting transport blocks in a base station of a wireless communication system employing carrier aggregation, the method comprising: mapping each of a plurality of transport blocks to each of a plurality of component carriers using a first mapping pattern; transmitting the plurality of transport blocks to a mobile station; recognizing whether the plurality of transport blocks are transmitted successfully; and mapping each of the plurality of transport blocks to each of the plurality of component carriers using a second mapping pattern and retransmitting the plurality of transport blocks to the mobile station, when the plurality of transport blocks are not transmitted successfully, wherein the first mapping pattern is different from the second mapping pattern, wherein the retransmitting includes transmitting control information for each of the plurality of transport blocks to the mobile station, the control information including a HARQ (hybrid automatic repeat request) swap indicator which indicates that a different mapping pattern from the first mapping pattern is used, wherein the control information includes a carrier selection bit indicating which component carrier a specific transmission block is transmitted through, when a number of the plurality of component carriers is greater than 3, wherein the control information further includes NDI (new data indicator) for determining, by the mobile station, a HARQ process ID, and wherein the second mapping pattern is a pattern generated by cyclic-shifting the first mapping pattern by a specific component carrier number based on a number of retransmission attempts.