Synchronization to a base station and code acquisition...

H - Electricity – 04 – W

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H04W 56/00 (2009.01) H04B 1/707 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2300156

Each transmission frame within a spread spectrum communications system relating to synchronization code transmission is divided into a plurality of slots. Each of the slots includes a primary (pilot) code ~ p and a secondary (combined) code ~ s/1ci that includes information identifying or indicative of both a frame timing and a scrambling code for synchronization. This information concerning frame timing and scrambling code may be encoded in the combined code ~ s/1ci itself, as well as in the modulation values of the sequences of plural combined codes within a frame. Alternatively, the information is encoded in the sequence of plural combined codes ~ s/1ci transmitted in each frame, as well as in the modulated values of the sequences of plural combined codes within a frame. As yet another alternative, the information is encoded in the timing of the combined code ~ s/1ci transmission within each slot of the frame relative to its associated primary code ~ p.

Dans un système de télécommunications à spectre étalé, chaque trame de transmission relative à la transmission de codes de synchronisation est divisée en plusieurs créneaux temporels. Chaque créneau temporel comporte un code primaire <o>c</o>p pilote et un code secondaire <o>c</o>s/lci (combiné) qui comporte des informations permettant d'identifier ou d'indiquer à la fois une base de temps de trame et un code de brouillage de synchronisation. Les informations relatives à une base de temps de trame et à un code de brouillage peuvent être codées dans le code combiné <o>c</o>s/lci lui-même, ainsi que dans les valeurs de modulation des séquences de multiples codes combinés dans une trame. Dans un autre mode de réalisation, les informations sont codées dans la séquence de multiples codes combinés transmis dans chaque trame, ainsi que dans les valeurs modulées des séquences de multiples codes combinés <o>c</o>s/lci, dans une trame. Dans un autre mode de réalisation encore, les informations sont codées dans la base de temps de la transmission de codes combinés <o>c</o>s/lci, dans chaque créneau temporel de la trame par rapport au code primaire <o>c</o>p associé à celui-ci.

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