Patent ID: 7746822
Filing Date: 2010-06-29
Classification: H04B,H04L,H04W

Abstract:
1. A method for communicating in a wireless network by transmitting data packets to a user for a duration of a total transmitting time (T), comprising: determining by a base station a signal-to-noise ratio (SNR) for channels between a base station and the user, between one or more relay stations and the user, and between the base station and the one or more relay stations; selecting by the base station a relay station from the one or more relay stations based on the determined SNRs; determining by the base station a time-sharing parameter (λ) for the selected relay station based on each of the determined base station-user SNR, selected relay station-user SNR, and base station-selected relay station SNRs; by the base station, encoding signals using a coding rate of the binary logarithm of the sum of 1 and the base station-selected relay station SNR and transmitting the encoded signals to the selected relay station for a first duration equal to (1-λ)T; by the base station, encoding and transmitting signals comprising data packets by the base station to the user using multi-access code for a second duration equal to λT, wherein the base station encodes the signals transmitted for the second duration using a coding rate of the binary logarithm of the sum of 1 and the base station-selected relay station SNR; and by the selected relay station, encoding and transmitting signals comprising data packets by the selected relay station to the user simultaneously with the base station transmitting to the user using multi-access code for the second duration equal to λT, wherein the simultaneous signal transmissions are adapted to be decoded utilizing joint decoding with interference cancellation, and wherein further the selected relay station encodes the signals using a coding rate of the difference between a first binary logarithm of the sum of 1 and the base station-selected relay station SNR and the selected relay station-user SNR and a second binary logarithm of the sum of 1 plus the base station-selected relay station SNR.