Medium access control protocol for wireless network

Details Medium access control protocol for wireless network Medium access control protocol for wireless network

H - Electricity

04

B

H04B 1/38 (2006.01) H04L 12/28 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2154897

A communicator station (60a) wirelessly transmits frames to and receives frames from at least one additional communicator (60b) in a Group in accordance with a MAC protocol. One of the communicators functions as a hub (64) and the remaining communicators function as remotes (66). The hub (64) sends control information to the remotes to establish repeating communication cycles, each of which has intervals during which the hub and the remotes transmit and receive frames. The intervals allow the hub (64) and the remotes (66) to anticipate transmitting and receiving frames, thereby allowing the remotes to power off their receivers and transmitters to achieve a considerable savings in power consumption without degrading communications. Other improved features include adjusting the intervals and the durations of transmission opportunities in the communication cycle to obtain the beneficial aspects of TDMA and PRMA for LAN-like communication without also incurring most of the undesirable aspects of such MAC techniques. Other control functions such as arbitration determine which communicator is better suited to act as the hub.

Une station de communication (60a) échange sans fil des blocs de données avec au moins une deuxième station de communication (60b) d'un groupe selon un protocole MAC (contrôle d'accès à un moyen de communication). Une des stations fonctionne en tant que centre (64) et les autres fonctionnent en tant que stations distantes (66). Le centre (64) envoie des informations de commande aux stations distantes pour l'établissement de cycles de communications répétitifs dont chacun présente des intervalles pendant lesquels le centre et les stations distantes émettent et reçoivent des blocs. Ces intervalles permettent au centre (64) et aux stations distantes (66) d'anticiper l'émission et la réception des blocs, les stations distantes pouvant alors mettre hors tension leurs émetteurs et récepteurs pour offrir des économies d'énergie considérables sans dégradation des communications. D'autres caractéristiques améliorées incluent l'adaptation des intervalles et des durées de possibilités d'émission dans le cycle de communication, pour tirer parti des avantages de l'AMRT et de l'AMRP pour les communications du type réseau local sans avoir à subir la plupart des inconvénients de telles techniques MAC. D'autres fonctions de commande, telles que l'arbitrage, déterminent quelle station de communication peut intervenir au mieux en tant que centre.

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