Method of transmitting data using constellation rearrangement
AssigneeLG Electronics Inc.
InventorsSung Ho Moon, Seung Woo Nam, Jong Min Kim, Hyung Ho Park, Han Gyu Cho, Jin Soo Choi, Jae Hoon Chung, Jong Young Han, Suk Woo Lee
Life of this patent
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Abstract
A data retransmission method using hybrid automatic repeat request (harq) includes transmitting a data block, receiving a retransmission request signal for the data block, generating a retransmission block by performing swapping or inversion between bits constituting the data block according to the retransmission request signal, and transmitting the retransmission block.
Claims2
A method for performing hybrid automatic repeat request (HARQ) increment redundancy (IR) in a wireless communication system, the method comprising:
- storing encoded information bits into a circular buffer;
- selecting a transport block which is a part of the encoded information bits in the circular buffer to perform HARQ IR;
- mapping the transport block onto a constellation for 2n-Quadrature Amplitude Modulation (QAM) in accordance with a mapping rule, where n denotes a modulation order;
- and
- transmitting the mapped transport block to a receiver,
- wherein a starting point of the transport block in the circular buffer is changed for HARQ retransmission,
- wherein the mapping rule is changed when transmitted bits wrap-around at the end of the circular buffer,
- wherein the mapping rule is changed between a first mapping rule and a second mapping rule,
- wherein each n bits in the transport block is mapped on the constellation for 2n-QAM, and the first mapping rule is {b0, . . . , bn-1} and the second mapping rule is {bn-1, . . . , b0}, and
- wherein n is four or six.
A transmitter configured to perform hybrid automatic repeat request (HARQ) increment redundancy (IR) in a wireless communication system, comprising:
- a radio frequency (RF) unit configured to transmit and receive a radio signal;
- and
- a processor coupled with the RF unit and configured to:
- store encoded information bits into a circular buffer;
- select a transport block which is a part of the encoded information bits in the circular buffer to perform HARQ IR;
- map the transport block onto a constellation for 2n-Quadrature Amplitude Modulation (QAM) in accordance with a mapping rule, where n denotes a modulation order;
- and
- instruct the RF unit to transmit the mapped transport block to a receiver,
- wherein a starting point of the transport block in the circular buffer is changed for HARQ retransmission,
- wherein the mapping rule is changed when transmitted bits wrap-around at the end of the circular buffer,
- wherein the mapping rule is changed between a first mapping rule and a second mapping rule,
- wherein each n bits in the transport block is mapped on the constellation for 2n-QAM, and the first mapping rule is {b0, . . . , bn-1} and the second mapping rule is {bn-1, . . . , b0}, and
- wherein n is four or six.
Dependencies are inferred from the claim text.