COOPERATIVE MAC PROTOCOL WITH RELAY SELECTION AND POWER CONTROL

摘要

The present invention proposes a method of communication in a wireless relay network for finding group of relays that minimizes total energy consumption to send one successful bit to destination node, under reliability condition expressed in terms of average BER level, said method comprising three main phases in the manner that a reservation stage where cooperative data transmission request is made by the source node, an ACO epoch, where the announcements of the candidate relays are sent, the cooperation set is formed and power levels are assigned, and the cooperative data transmission stage itself, are defined.

主权项

1. A method of communication in a wireless network for fining group of relays that minimizes total energy consumption to send one successful bit to destination node in a centralized or distributed manner, under reliability condition expressed in terms of average BER level, said method comprising three main stages,
i) reservation stage, where cooperative data transmission request is made by the source node, said reservation stage comprising the steps of sending of a Cooperative Request To Send (C-RTS) packet to the destination node by a source node, replying back by said destination node with a Cooperative Clear To Send (C-CTS) packet, ii) Available to COoperate (ACO) epoch, where the announcements of the candidate relays are sent, said Available to COoperate (ACO) epoch stage comprising the steps of making of a decision by a neighboring relay node that receives both said Cooperative Request To Send and Cooperative Clear To Send packets on whether to participate cooperative transmission and announcement of cooperative transmission participation decision by said neighboring relay nodes with an Available to COoperate (ACO) packet in the manner that Available to COoperate packets by candidate relays are transmitted according to the decisions of the relays and that each relay considers the state of the channel between itself and the source node in terms of the average SNR, estimated via the reception of Cooperative Request To Send packet, the state of the channel between itself and the destination node in terms of the average SNR, estimated via the reception of Cooperative Clear To Send packet and iii) the cooperative data transmission stage, where the source node starts a transmission by sending a data packet, the relay nodes receiving a cony of this packet and the source node and the nodes in the cooperation set cooperatively transmitting the data packet to the destination node over orthogonal channels.