Patent ID: 7574645
Filing Date: 2009-08-11
Classification: H04L

Abstract:
1. A method of detecting and decoding enhanced dedicated channel (E-DCH) hybrid automatic repeat request (H-ARQ) indicator channel (E-HICH) transmissions, the method comprising: a wireless transmit/receive unit (WTRU) receiving a plurality of HARQ indicators from a serving radio link set (RLS) and at least one non-serving radio link; the WTRU performing a binary hypothesis test for each H-ARQ indicator to determine whether each H-ARQ indicator is an acknowledgement (ACK) indicator or a non-acknowledgement (NACK) indicator by calculating a log likelihood ratio (LLR) of a conditional probability that an ACK indicator is transmitted to a conditional probability that a NACK indicator is transmitted and comparing the LLR with a threshold, the threshold being zero for the H-ARQ indicator transmitted from a serving RLS and non-zero for the H-ARQ indictor transmitted from a non-serving radio link; if the LLR is below the threshold, the WTRU determining the H-ARQ indicator as a NACK indicator; and if the LLR is not below the threshold, the WTRU determining the H-ARQ indicator as an ACK indicator.