Method and apparatus for improving performance of a packet...

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/22 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2272594

A communications system (10) is provided that uses a multiple access packet reservation type of protocol. The physical channels required for the packet transfers are specially allocated to one mobile station (16) (referred to as a "VIP MS"). The VIP MS (16) has the exclusive priority to use these allocated physical channels for packet data as needed. Consequently, the VIP MS (16) always has the negotiated bandwidth available for the packet transfers. Furthermore, since the VIP MS (16) is given the highest exclusive priority to access these physical channels ("VIP priority"), by allocating a reserved random access channel dedicated to the VIP MS (e.g., on one allocated uplink channel), the variable random access delays experienced by prior systems no longer exist. Since the VIP MS (16) is always scheduled first for transmissions on the downlink, and reserved access is provided for the VIP MS (16) on the uplink, only a constant delay period for the uplink and downlink is involved. In other words, the VIP MS (16) is guaranteed both a bandwidth for the packet transfers and a constant uplink and downlink delay.

L'invention porte sur un système de communication (10) utilisant un protocole du type à réservation de paquets à accès multiple. Les canaux physiques requis pour le transfert des paquets sont spécialement attribués à une station mobile (16) (dite "VIP MS"). La VIP MS (16) bénéficie d'une priorité exclusive d'utilisation de ces canaux physiques pour ses paquets de données, en fonction de ses besoins. En conséquence, la VIP MS (16) dispose en permanence de la largeur de bande négociée pour les transferts de paquets. De plus, comme la VIP MS (16) bénéficie toujours de la priorité exclusive la plus élevée pour l'accès à ces canaux physiques, (priorité VIP), en attribuant un canal réservé d'accès aléatoire à la VIP MS, (par exemple sur un canal ascendant attribué), on élimine les délais variables d'accès aléatoire inhérents aux systèmes antérieurs. Comme la VIP MS (16) est toujours prioritaire pour les liaisons descendantes et bénéficie d'un accès réservé sur les liaisons ascendantes, elle ne peut subir qu'un délai d'attente constant. En d'autres termes, la VIP MS (16) se voit garantir à la fois une largeur de bande pour le transfert des paquets, et un délai d'attente constant pour les liaisons ascendantes et descendantes.

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