Random access in a mobile telecommunications system

H - Electricity – 04 – W

Patent

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Details

H04W 74/08 (2009.01) H04B 7/216 (2006.01) H04J 11/00 (2006.01) H04W 88/02 (2009.01) H04W 88/08 (2009.01) H04B 1/69 (2006.01)

Patent

CA 2331997

An uplink common physical channel (random access channel) frame structure is disclosed with a separate preamble and data portion. The preamble is used by a base station to detect that a mobile station is attempting a random access request. The data portion of the channel includes user data, and pilot symbols that provide energy for channel estimation during reception of the data portion. A guard interval (TG) is preferably inserted between the preamble and data portion of the frame, which enables data detection to occur during an idle period. As such, the frame structures for both the common physical (random access) uplink channel and dedicated physical (traffic) uplink channel are compatible.

L'invention concerne une structure de trame de la voie physique commune liaison montante (voie d'accès aléatoire), comprenant un préambule et une partie données séparés. Une station de base utilise le préambule afin de détecter si une station mobile fait une demande d'accès aléatoire. La partie données de la voie comporte des données utilisateur, et des symboles pilotes qui fournissent l'énergie pour l'évaluation de la voie pendant la réception de la partie données. Un intervalle de garde (T¿G?) est, de préférence, inséré entre le préambule et la partie données de la trame. Ainsi la détection des données peut avoir lieu pendant une durée de repos. Par conséquent, les structures de trames de la voie physique commune liaison montante (accès aléatoire) et de la voie physique dédiée liaison montante (trafic) sont compatibles.

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