Patent ID: 8681816

Claim:
A method for use in a Global System for Mobile Communication (GSM)/Enhanced Data Rates for Global Evolution (EDGE) Radio Access Network (GERAN) compliant wireless transmit/receive unit (WTRU), the method comprising: receiving a first data block associated with a downlink temporary block flow (TBF), wherein the first data block includes a first header that includes a temporary flow identity (TFI) that identifies the downlink TBF; generating a piggybacked acknowledgement/non-acknowledgement (PAN) field corresponding to the downlink TBF; generating a PAN check sequence (PCS) based on the PAN field; masking a subset of PCS bits with the TFI to generate a masked PCS; generating a second data block, associated with an uplink TBF, that includes a second header, a data part corresponding to the uplink TBF, the PAN field, and the masked PCS; and transmitting the second data block.