H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/413 (2006.01)
Patent
CA 2613677
A mechanism is provided to extend the range of wireless devices beyond the range limit that results from timing restrictions imposed by the IEEE 802.11 standard. The mechanism, which operates at the upper level of the 802.11 MAC, determines whether the wireless devices are far apart or not far apart. When the wireless devices are determined to be far apart, the standard retransmission protocol at the lower level of the 802.11 MAC is disabled and a custom ACK packet is utilized. Delivery of a transmitted packet is confirmed if the custom ACK packet is received within a maximum delay period that takes into account the longer propagation delay between wireless devices that are far apart.
L'invention porte sur un mécanisme accroissant la porté de dispositifs sans fil au delà de la limite due aux restrictions temporelles imposées par la norme IEEE 802.11. Le mécanisme du niveau haut de la 802.11 MAC, détermine si les dispositifs sans fil sont hors de porté l'un de l'autre ou non. S'ils le sont, le protocole standard de retransmission du niveau bas de la 802.11 MAC est désactivé et on utilise le paquet ACK usuel. La délivrance d'un paquet transmis est confirmée si ledit paquet est reçu à l'intérieur d'un délai maximal prenant en compte le délai plus élevé de propagation entre des dispositifs sans fil hors de porté.
Abhishek Abhishek
Hassan Amer A.
Huitema Christian
Madhavan Poovanpilli G.
Ruan Jiandong
Microsoft Corporation
Smart & Biggar
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