Patent ID: 8804610
Filing Date: 2014-08-12
Classification: H04W

Abstract:
1. A packet transmission scheduling method in a wireless network for simultaneously transmitting packets from a gateway node to a plurality of receiver nodes, comprising: storing location information of the gateway node and the plurality of receiver nodes, and a path loss exponent of each multiplexing path in which one of the plurality of receiver nodes is located; selecting from the plurality of receiver nodes two receiver nodes that are at a predetermined distance from the gateway node, calculating a Signal-to-Interference and Noise Ratio (SINR) for one of the selected receiver nodes using a distance between the two selected receiver nodes and a corresponding path loss exponent, and when the calculated SINR exceeds a threshold, forming a path table that includes a path between the two selected receiver nodes to simultaneously transmit the packets from the gateway node to the two selected receiver nodes; and scheduling packet transmission based on the path table, wherein the packets are simultaneously transmitted by scheduling a transmission order with reference to the path table in the packet transmission for spatial reusability of a channel, wherein the path table includes a set of paths to simultaneously transmit the packets from the gateway node to the plurality of receiver nodes for the spatial reusability of the channels, wherein the packets are consecutively transmitted from the gateway node to the plurality of receiver nodes by a back off procedure, and wherein a back off value of the back off procedure is selected based on a minimal contention window size and a maximal contention window size.