Method and apparatus for uplink synchronization in wireless...

H - Electricity – 04 – B

Patent

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H04B 7/216 (2006.01)

Patent

CA 2544960

A method and system for uplink (UL) synchronization of an uplink transmission from a plurality of wireless transmit/receive units (WTRUs) to a Node-B in a code division multiple access (CDMA) system. A Node-B receives a transmission including a UL synchronization (SYNC_UL) sequence from a WTRU. A sampler samples the transmission at a sampling rate which is higher than a chip rate. The samples are down-sampled and the SYNC_UL sequence is detected at a lower rate. A first significant path location of the detected SYNC_UL sequence is determined, and based on the first significant path location, a final significant path location is determined. The final significant path location is quantized and UpPCHPOS is transmitted to the WTRU to adjust a UL transmission timing.

L'invention concerne un procédé et un système destinés à la synchronisation en liaison montante (U/L) d'une transmission en liaison montante entre une pluralité d'unités d'émission/réception sans fil (WTRU) et un Noeud-B dans un système à accès multiple par répartition de code (AMRC). Dans la présente invention, un Noeud-B reçoit une transmission comprenant une séquence de synchronisation U/L (SYNC_UL) transmise par une WTRU. Un échantillonneur échantillonne la transmission à une fréquence d'échantillonnage qui est supérieure à un débit des éléments. Les échantillons sont sous-échantillonnés et la séquence SYNC_UL est détectée à une fréquence inférieure. Un premier emplacement de voie importante initial de la séquence SYNC_UL détectée est déterminé et, sur la base de cet emplacement, un emplacement de voie importante final est déterminé. Cet emplacement de voie importante final est quantifié et une valeur UpPCH<SB>POS</SB> est transmise à la WTRU pour ajuster la synchronisation de la transmission U/L.

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