Patent ID: 8565201
Filing Date: 2013-10-22
Classification: H04B,H04L,H04W,Y02D

Abstract:
1. A hybrid virtual multi-input multi-output (V-MIMO) transmission method of a management node in a wireless ad-hoc network in which a transmission path from a source node to a destination node is divided into one or more sections, the hybrid V-MIMO transmission method comprising: obtaining one or more pieces of node information of one or more nodes by transmitting an information request message to the nodes in response to a transmission request message for data transmission from the source node to the destination node; setting a shortest path (SP) from the source node to the destination node based on the obtained node information; determining transmission schemes, either asynchronous or synchronous, individually for nodes present on the SP wherein for asynchronous transmission, minimize the number of sections between the source node and the destination node in the path and a distance of each section is as extended as much as possible to save energy, and for synchronous transmission, select a path that has the smallest number of intermediate nodes while satisfying a limitation of periodic packet transfer delay time; determined whether the service quality of traffic requires minimization of energy consumption and delay time, if it is required, the delay time and energy consumption are minimized and if it not, only an energy minimization algorithm is performed; check information of a CN and RN of a transmitter and a receiver of each section, thereby determining whether V-SIMO (virtual single-input multi-output), V-MISO, or V-MIMO transmission is possible, where in CN is combining node based on energy efficiency ratings; issuing a transmission preparation request by transmitting the determined transmission schemes to the respective corresponding nodes; and transmitting a transmission start message to the source node in response to transmission ready responses from the respective nodes.