Timing adjustment control for efficient time division duplex...

H - Electricity – 04 – Q

Patent

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Details

H04Q 11/04 (2006.01) H04B 1/707 (2006.01) H04B 7/26 (2006.01) H04J 3/06 (2006.01) H04J 13/02 (2006.01) H04Q 7/34 (2006.01) H04Q 11/02 (2006.01) H04J 13/00 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2223321

A system for time division duplex communication over a single frequency band wherein guard time overhead is reduced by active adjustment of reverse link transmission timing as a function of round trip propagation delay. Responding to a polling message from the base station, a user station seeking to establish communication transmits a reply message. The base station using a propagation delay calculator (812) calculates the distance of the user station by measuring the propagation delay with respect to receipt of the reply message and a timing control unit (806) and transmitter (807) for sending a timing adjustment command to the user station instructing it to advance or retard its timing. Thereafter, the base station monitors the user station transmissions and periodically commands it to adjust its timing in a like manner. The user station transmits a control preamble at the start of each time slot to allow the base station to perform round trip timing calculations and adjustment of the user station's power or antenna selection.

Système servant à réaliser des télécommunications en duplex à répartition dans le temps sur une seule bande de fréquence, ce qui permet de diminuer le dépassement du temps de protection par réglage actif de la synchronisation de la transmission à liaison inverse en fonction du temps de propagation aller-retour. En réaction à un message d'interrogation émis par la station de base, une station usager cherchant à établir une communication, émet un message de réponse. La station de base, au moyen d'un calculateur de temps de propagation (812), calcule la distance à laquelle se trouve la station usager par mesure du temps de propagation par rapport à la réception du message de réponse et en utilisant un ensemble de commande de synchronisation (806), ainsi qu'un émetteur (807), pour envoyer une instruction de réglage de synchronisation à la station usager, en lui donnant l'ordre d'avancer ou de retarder sa synchronisation. La station de base contrôle ensuite les émissions de la station usager et lui donne l'ordre périodiquement de régler sa synchronisation de façon similaire. La station usager émet un préambule de commande au départ de chaque tranche de temps, afin de permettre à la station de base d'effectuer des calculs de synchronisation aller-retour, ainsi que des réglages de la puissance ou de la sélection d'antenne de la station usager.

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