Patent ID: 8625716

Claim:
A method of performing hybrid automatic repeat request (HARQ) increment redundancy (IR) in a wireless communication system, the method comprising: storing encoded information bits in a circular buffer; selecting a transport block from the encoded information bits stored in the circular buffer to perform the HARQ IR, wherein a starting point of the transport block is changed for HARQ retransmission; selecting a mapping rule to map the transport block on a constellation for 2 m -Quadrature Amplitude Modulation (QAM), wherein m is a modulation order and the mapping rule is changed when transmitted bits wrap-around at an end of the circular buffer, and wherein the mapping rule is selected as a first mapping rule or a second mapping rule; mapping the transport block to data symbols according to the mapping rule, wherein if the transport block includes n bits represented by {b 0 , . . . , b n-1 }, the first mapping rule for the n bits is represented by {b 0 , . . . , b n-1 } and the second mapping rule for the n bits is represented by {b n-1 , . . . , b 0 }; and transmitting the data symbols to a receiver, wherein n indicates a size of the encoded information bits included in the transport block.