Patent ID: 8219870

Claim:
A method for bit collection in a Hybrid Automatic Repetition reQuest (HARQ), comprising the following steps of: (a) determining a number of rows N row and a number of columns N col in a rectangular interleaver according to read high layer control information and local configuration parameters, where the number of rows in the rectangular interleaver is: N row =BitPerSymbol=log 2 (ModulationOrder) wherein, BitPerSymbol is a number of bits of each symbol, ModulationOrder is an order of modulation, and the order is 4 when the modulation is Quadrature Phase Shift Keying modulation; the order is 16 when the modulation is 16 Quadrature Amplitude Modulation; the order is 256 when the modulation is 256 Quadrature Amplitude Modulation; the order is 1024 when the modulation is 1024 Quadrature Amplitude Modulation; and the order is 4096 when the modulation is 4096 Quadrature Amplitude Modulation; the number of columns in the interleaver is: N col = N data N row . wherein N data is the number of total bits after a second rate matching of the HARQ: N data = ChipRate SF · TTI · BitPerSymbol · Codes wherein ChipRate is a chip rate of WCDMA FDD system; SF is a spread factor of a HSDPA; TTI is a transmission time interval of HSDPA; Codes is a number of codes allocated to HSDPA user, in a range of 1˜15; (b) determining a temporary number of rows N r and a temporary number of columns N c according to a number of the columns N col in the interleaver and a number of system bits N t,sys obtained after the second rate matching of the HARQ; (c) writing system bits column by column into the interleaver according to the obtained N row , N col , N t,sys , N r and N c , and then writing parity bits column by column into blank rows of each column in the rectangular interleaver; (d) reading data from the rectangular interleaver in an order different from the writing order to complete the bit collection.