Method of and apparatus for pilot channel acquisition

H - Electricity – 04 – B

Patent

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Details

H04B 1/76 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2212757

A wireless communication device (100) acquires a pilot channel before an assigned slot when the wireless communication device is operating in the slotted mode of a CDMA system. The wireless communication device comprises a searcher receiver (107) that determines the short-term average pilot strength of active and neighbor pilot channels. Finger receivers (107) determine the long-term average pilot strength of the active and neighbor pilot channels. A logic and control circuit (113) assigns the finger receivers to the pilot channels according to their short-term average pilot strength, determines if the long-term average pilot strength of a neighbor channel is greater that the active pilot channel's pilot strength, and determines to hand off to the neighbor pilot channel with the greater long-term average pilot strength. Moreover, an early detection correlation length can be dynamically adjusted according to the pilot strength of the active pilot channel to shorten the pilot acquisition process.

L'invention est un dispositif de communication sans fil (100) qui fait l'acquisition d'un canal pilote avant une fenêtre attribuée quand il fonctionne dans le mode de fenêtrage d'un système AMDC. Le dispositif de l'invention comporte un récepteur de recherche (107) qui détermine l'intensité moyenne à court terme des canaux actifs et des canaux pilotes voisins. Des récepteurs d'identification (107) déterminent l'intensité moyenne à long terme des canaux actifs et des canaux pilotes voisins. Un circuit de commande logique (113) affecte les récepteurs d'identification aux canaux pilotes d'après leur intensité moyenne à court terme, détermine si l'intensité moyenne à long terme d'un canal voisin est plus grande que l'intensité du canal pilote actif et effectue un transfert sur le canal pilote voisin dont l'intensité moyenne à long terme est la plus grande. Par ailleurs, une longueur de corrélation de détection précoce peut être ajustée dynamiquement d'après l'intensité du canal pilote actif pour raccourcir le processus d'acquisition du canal pilote.

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