Cell search method, forward link frame transmission method,...

H - Electricity – 04 – L

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H04L 7/10 (2006.01)

Patent

CA 2642017

In a cellular system in which OFDM is used, a forward link synchronization channel, a common pilot channel structure, an initial cell searching method of a mobile station, and an adjacent cell searching method for handover are required. A method of transmitting a forward synchronization signal in a wireless communication system according to the present invention includes generating a frame comprised of a plurality of sync blocks; and transmitting the frame through a forward link, wherein the frame comprises primary synchronization channel sequences which provide timing information of the sync blocks and a plurality of secondary synchronization channel sequences which provide timing information of the frame, wherein a cell identifier is specified by a combination of the primary synchronization channel sequence and a hopping code word specified by the plurality of the secondary synchronization channel sequences Therefore, the cell searching time can be efficiently reduced in an OFDM system.

Un système cellulaire OFDM doit disposer d'un canal de synchronisation à liaison aval, d'une structure de canal pilote commun, d'un procédé de recherche de cellule initiale par une station mobile, et d'un procédé de recherche de cellule adjacente aux fins de transfert. L'invention concerne un procédé permettant de transmettre un signal de synchronisation aval dans un système de communication sans fil, qui consiste à générer une trame constituée d'une pluralité de blocs de synchronisation, et à transmettre la trame par l'intermédiaire d'une liaison aval. Ladite trame comporte des séquences de canal de synchronisation primaire contenant des informations temporelles relatives aux blocs de synchronisation, et une pluralité de séquences de canal de synchronisation secondaire contenant des informations temporelles relatives à la trame, un identificateur de cellule étant spécifié par la combinaison de la séquence de canal de synchronisation primaire et d'un mot de code de saut spécifié par la pluralité de séquences de canal de synchronisation secondaire. L'invention permet par conséquent de réduire efficacement le temps de recherche de cellule dans un système OFDM.

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