Patent ID: 7027782
Filing Date: 2006-04-11
Classification: H04J,H04L,H04W

Abstract:
1. A method for retransmitting coded bits by a transmitter in response to a retransmission request from a receiver in a mobile communication system, which separates coded bits output from an encoder at a given coding rate into coded bits with higher priority and coded bits with lower priority, and transmits from the transmitter to the receiver a stream of symbols obtained by symbol mapping the coded bits with higher priority and the coded bits with lower priority by a specific modulation technique, with at least one available orthogonal code, the method comprising the steps of: determining orthogonal codes available for retransmission; separating the coded bits with higher priority and the coded bits with lower priority into a plurality of sub-packets with a given size, and selecting at least a portion of the sub-packets to be repeatedly transmitted, depending on the determined number of available orthogonal codes; and transmitting a stream of symbols obtained by symbol-mapping coded bits of the selected sub-packets by the specific modulation technique, with the determined available orthogonal codes.