Patent ID: 7885244
Filing Date: 2011-02-08
Classification: H04L,H04W

Abstract:
1. A method for communicating in a network including a coordinator node and a set of leaf nodes, comprising: transmitting periodically, from the coordinator node to the set of leaf nodes a beacon defining a superframe, wherein the superframe includes an active period and an inactive period following the active period, and wherein the active period includes a first contention access period (CAP- partitioning the inactive interval of the superframe into inactive time slots, wherein each inactive time slot includes a main interval and a guard interval; wherein for transmission during the CFP- wherein all acknowledgements are sent simultaneously as group, wherein the GACK is able to serve as an auxiliary beacon for subsequent retransmission; if a retransmission of data fails during the CFP- and wherein the superframe active interval comprises multiples of comprehensive CFP intervals.