Seamless soft handoff in a cdma cellular communications system

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/38 (2006.01)

Patent

CA 2273955

During a "make before you break" handoff performed within a CDMA communications system, duplicate downlink communications (50) are generated and routed through different base stations (16) for delivery to the mobile station (18). At the mobile station, the duplicate signals are received and the frame sequence numbers of the substantially simultaneously received frames (58) therein are compared (60). If the sequence numbers do not match, the duplicate signals are identified as not being synchronously received by the mobile station. In response thereto, the mobile station signals (64) the communications network on the uplink with a timing adjustment message, and appropriate timing modifications (66) are made with respect to the transmission of the duplicate signals in order to provide for substantially synchronous reception. Diversity combination and decoding (68) are then performed on the received signals. Alternatively, the mobile station buffers (72) the earlier arriving signal and waits for the later arrival of the sequence number matching frame of the duplicate signal before engaging in diversity combining and decoding of the received signals.

Lors d'un transfert de type "à fermeture avant rupture" effectué dans un système de communications à accès multiple par code de répartition, des communications (50) en double de liaison descendante sont générées et acheminées par différentes stations de base (16) qui les transmettent à la station mobile (18). Dans la station mobile, les signaux en double sont reçus et les numéros de séquence de trame des trames (58) reçues presque simultanément sont comparés. Si les numéros de séquence ne correspondent pas, les signaux en double sont identifiés comme n'ayant pas été reçus de manière synchrone par la station mobile. En réponse, la station mobile envoie des signaux (64) au réseau de communications en liaison montante avec un message d'ajustement de synchronisation, et des modifications de synchronisation (66) appropriées sont effectuées en ce qui concerne la transmission des signaux en double afin d'assurer une réception sensiblement synchrone. Une combinaison et un décodage en diversité (68) sont alors effectués sur les signaux reçus. Dans un autre mode de réalisation, la station mobile met en mémoire tampon (72) le signal reçu plus tôt et attend l'arrivée ultérieure de la trame correspondante du numéro de séquence du signal en double, avant de procéder à la combinaison et au décodage en diversité des signaux reçus.

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