A method for a simple 802.11e hcf implementation

H - Electricity – 04 – L

Patent

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H04L 12/28 (2006.01)

Patent

CA 2519648

A Hybrid Coordination Function (HCF) implementation wherein an access point's existing (E)DCF Enhanced Distributed Coordination Function transmit queues are augmented by at least one strict priority HCF transmit queue. The HCF queues are only used to schedule downlink data and CF-Poll transmissions are used for admitted downlink flows and for uplink flows. The 802.1D user priority value is used to select the HCF queue for an admitted flow. The strict priority HCF transmit queues are always serviced first, in priority order before any other (E)DCF transmit queue. The channel is considered busy to (E)DCF transmit queues while the strict priority queues are being serviced. An admissions control mechanism is used to control data flows and prevents the strict priority traffic from starving (E)DCF traffic. A single, simple AP scheduler is used for scheduling both polling times and station wakeup times. Different embodiments of the invention includes assigning a fixed size to all transmission opportunities, the establishment of a wakeup schedule for a power- save station, the implementation of a polling schedule for the station, the establishment of a schedule based on a timer wheel, and the allocation of a token bucket for a data stream with a predetermined number of tokens.

L'invention concerne la mise en oeuvre d'une fonction de coordination hybride (HCF), selon laquelle au moins une file d'attente de transmission HCF à priorité stricte est ajoutée aux files d'attente de transmission (E)DCF existantes d'un point d'accès. Les files d'attente HCF sont uniquement utilisées pour la planification de données descendantes, et des transmissions d'invitation à émettre CF sont employées pour des flux montants et des flux descendants admis. La valeur de priorité utilisateur 802.1D est utilisée pour sélectionner la file d'attente HCF pour un flux admis. Les files d'attente de transmission HCF à priorité stricte sont toujours gérées en premier, par ordre prioritaire, avant une quelconque autre file d'attente (E)DCF. Le canal est considéré comme occupé pour des files d'attente de transmission (E)DCF lors de la gestion de files d'attente à priorité stricte. Un mécanisme de commande des admissions est utilisé pour commander les flux de données de commande et empêche que le trafic à priorité stricte n'étouffe le trafic (E)DCF. Un planificateur AP simple et unique est utilisé pour planifier les temps d'invitation à émettre ainsi que les temps de réveil de station.

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