Sungkyunkwan University

Samsung Electronics Co., Ltd.

Chang-Yeong Oh

Tae-Jin Lee

Jongho Park

Mingyu Lee

Ji Hyoung Ahn

Suwon Lee

Soonyoung Yoon

Woo Suk Cha

Pyeong-Soo Mah

Iljin Youn

A network broadcast method using a MAC unicast and an MPR node allows a source node to transmit a data packet to at least one MPR node which is located within one-hop distance from the source node and allows the at least one MPR node to transmit the data packet to each next-ranked MPR nodes. At least one normal node, which is not an MPR node while being located within one-hop distance from the source node, receives the data packet of the source node, which is transferred from the source node to an MPR node or transferred between MPR nodes through overhearing. Although the source node and MPR nodes are in a hidden-node relationship, collision is prevented, thereby minimizing data packet loss to improve the transmission reliability, and enabling the data packet of the source node to be reliably broadcasted on a network.

Network broadcast method using unicast and relay node

Method of performing cooperative communication in wireless LAN includes determining, by receiver, whether cooperative communication is necessary based on transmission request signal provided from transmitter, when it is determined that the cooperative communication is necessary, transmitting, by the receiver, transmission response signal instructing the cooperative communication, overhearing, by a plurality of devices, the transmission response signal instructing the cooperative communication, transmitting, by at least one of the devices, response signal for supporting relaying to the transmitter, selecting, by the transmitter, a relay based on the response signal, transmitting, by the transmitter, data to the relay, and attaching, by the relay, data of the relay to the data transmitted by the transmitter and transmitting result data to the receiver. Thus, average transmission rate of wireless LAN can be improved with minimized overhead, and additional transmission opportunity can be provided to relaying device, thereby properly rewarding relaying device.

Methods of performing cooperative communication in wireless LANs

Growing community of inventors

Suwon-si, South Korea

Chang-Yeong Oh