Selection of retransmission settings for HARQ in WCDMA and LTE networks
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorJung-Fu Cheng
Life of this patent
Estimating the term…
Abstract
Improvements in the performance of HARQ operation are achieved by considering two channel coding parameters, the number of filler bits F and the number of dummy bits ND, in the selection of the retransmission settings for HARQ operation. In one exemplary embodiment, an optimal RV setting for the retransmission is selected based on the number of filler bits F and the number of dummy bits ND. In another exemplary embodiment, an address offset to the RV starting point for a selected RV setting is selected based on the number of filler bits F and the number of dummy bits ND.
Claims18
A method, implemented by a transmitter, of adapting retransmission settings in a wireless communication terminal, the method comprising:
- coding an input bit stream to generate a block of coded bits for transmission from a transmitter to a receiver;
- determining a number of filler bits added to the input bit stream for said coding;
- interleaving the coded bits;
- determining a number of dummy bits added to said coded bits for said interleaving;
- transmitting, in an initial transmission, a first set of said coded bits;
- determining one or more retransmission parameters based on the code rate of the said initial transmission, number of filler bits used for coding and the number of dummy bits used for interleaving;
- and
- transmitting, in a retransmission, a second set of said coded bits selected based on said retransmission parameters.
A wireless communication terminal, comprising:
- a channel coding circuit including an encoder to code an input bit stream to generate a block of coded bits for transmission and an interleaver to interleave the coded bits output by the encoder;
- a transmitter to transmit a first set of said coded bits in an initial transmission and a second set of said coded bits in a retransmission;
- and
- a control unit to:
- determine one or more retransmission parameters based on the code rate of the said initial transmission, number of filler bits used to code said input bit stream and the number of dummy bits used to interleave the coded bits;
- and
- select the second set of coded bits transmitted in said retransmission based on said retransmission parameters.
Dependencies are inferred from the claim text.