Patent ID: 8681599

Claim:
A method of transmitting ACK/NACK (acknowledgement/negative acknowledgement) information through a physical hybrid automatic repeat request indicator channel (PHICH), the method comprising: mapping the ACK/NACK information to resource elements of an orthogonal frequency division multiplexing (OFDM) symbol of index l′ i , wherein the resource elements of the OFDM symbol of index l′ i corresponds to a resource element group (REG) index ( n i ) that is defined by one of the following equations: n _ i = { ( ⌊ ( N ID cell · n l i ⁢ ′ ′ / n 0 ′ ) ⌋ + m ′ ) ⁢ mod ⁢ ⁢ n l i ′ ′ ⁢ i = 0 ( ⌊ ( N ID cell · n l i ′ ′ / n 0 ′ ) ⌋ + m ′ + ⌊ n l i ′ ′ / 3 ⌋ ) ⁢ mod ⁢ ⁢ n l i ′ ′ ⁢ i = 1 ( ⌊ ( N ID cell · n l i ′ ′ / n 0 ′ ) ⌋ + m ′ + ⌊ 2 ⁢ n l i ′ ′ / 3 ⌋ ) ⁢ mod ⁢ ⁢ n l i ′ ′ i = 2 equation ⁢ ⁢ 1 where N ID cell denotes a cell ID, n′ l′ i denotes a number of available REGs in the OFDM symbol of index l′ i , n′ 0 denotes a number of available REGs in an OFDM symbol of index 0, and m′ denotes an index related to a PHICH group in which the PHICH is included, and n _ i = { ( ⌊ ( N ID cell · n l i ′ ′ / n 1 ′ ) ⌋ + m ′ ) ⁢ mod ⁢ ⁢ n l i ′ ′ ⁢ i = 0 ( ⌊ ( N ID cell · n l i ′ ′ / n 1 ′ ) ⌋ + m ′ + ⌊ n l i ′ ′ / 3 ⌋ ) ⁢ mod ⁢ ⁢ n l i ′ ′ ⁢ i = 1 ( ⌊ ( N ID cell · n l i ′ ′ / n 1 ′ ) ⌋ + m ′ + ⌊ 2 ⁢ n l i ′ ′ / 3 ⌋ ) ⁢ mod ⁢ ⁢ n l i ′ ′ i = 2 equation ⁢ ⁢ 2 where n ID cell denotes a cell ID, n′ l′ i denotes the number of available REGs in the OFDM symbol of index l′ i , n′ 1 denotes a number of available REGs in an OFDM symbol of index 1, and m′ denotes the index related to a PHICH group in which the PHICH is included.