Patent ID: 7912028

Claim:
A method for determining whether an encoded message in a shared channel is not intended for a communications device, the method comprising: (a) decoding the message to recover a multi-bit codeword; (b) determining whether the codeword is valid or invalid, wherein, if the codeword is determined to be invalid, then the encoded message is not intended for the communications device; and (c) if the codeword is determined to be valid, then performing one or more other steps of the method to determine whether the encoded message in the shared channel is not intended for the communications device, wherein: steps (a) and (b) are performed in parallel for a plurality of shared channels; the one or more other steps comprise: at least one single-channel step performed in parallel for each of the plurality of shared channels; and at least one multi-channel step performed for the plurality of shared channels; the at least one single-channel step comprises: (1) generating a correlation value for the codeword; and (2) comparing the correlation value to a threshold to determine whether the message is not intended for the communications device; and the at least one multi-channel step comprises: (1) selecting a shared channel having a minimum correlation value from the plurality of shared channels; (2) re-encoding and rate-matching the codeword for the selected shared channel to generate an encoded, rate-matched codeword; (3) calculating a re-encoded correlation value between the message and the encoded, rate-matched codeword; and (4) thresholding the calculated re-encoded correlation value to determine whether the message is not intended for the communications device; and the re-encoded correlation value is determined using the equation Corr = ⁢ ( ∑ i = 1 40 ⁢ S i · P i · U i ) 2 , wherein: S i is a soft bit value, P i is a re-encoded bit value, and U i is a UE scrambler bit value; and the correlation value is compared to a threshold by comparing Corr to Ene.40.Th, wherein Th is a correlation threshold, and Ene = ⁢ ∑ i = 1 40 ⁢ S i 2 .