Patent ID: 6954447
Filing Date: 2005-10-11
Classification: H04B,H04W

Abstract:
1. A method for synchronizing an uplink (UL) transmission from a wireless transmit/receive unit (WTRU) to a Node-B in a code division multiple access (CDMA) wireless communication system, the method comprising: (a) receiving a transmission including a UL synchronization (SYNC_UL) sequence from a WTRU; (b) sampling the transmission at a sampling rate; (c) down-sampling the samples; (d) detecting the SYNC_UL sequence in the transmission by processing the down-sampled samples; (e) determining a first significant path location of the detected SYNC_UL sequence; (f) determining a final significant path location at the sampling rate using the detected first significant path location; (g) transmitting a UL synchronization adjustment message generated based on the final significant path location to the WTRU; and (h) adjusting a UL transmission timing at the WTRU.