Reverse direction transmissions and network coding for energy-efficient Wi-Fi networks

Abstract

Abstract-This paper proposes a combination of the Reverse Direction Protocol (RDP) defined in the IEEE 802.11n and the Network Coding (NC) technique to improve the energy efficiency of wireless networks based on the IEEE 802.11. The aim of the combined approach, named BidCode, is to allow intermediate nodes to combine several received packets into coded packets and immediately forward them upon successful reception of data. The energy efficiency of BidCode is analyzed in this paper and compared to those of the Distributed Coordination Function (DCF) and an important NC protocol based on IEEE 802.11, called COPE. Both analytical and simulation results show the high energy efficiency of BidCode with gains of up to 350% and 130% when compared to DCF and COPE, respectively. *

Network Coding and Duty Cycling in IEEE 802.11 Wireless Networks with Bidirectional Transmissions and Sleeping Periods

“…For this reason, GreenCode has not been compared to DutyCode. In addition, the integration of reactive RD coded data transmissions into the operation of GreenCode to facilitate the sleep operation can further increase the energy efficiency, as shown in [8], [9]. The results presented in this paper show that GreenCode can increase the energy efficiency by up to 360% and 130% when compared to legacy mechanisms alone and combined with NC, respectively.…”

“…2) Integrating RD Transmissions: GreenCode integrates a variation of the IEEE 802.11n RDP to be used in conjunction with NC, presented and evaluated in [8], [9], to facilitate the TXOP PSM execution. This mechanism allows the receiver of a valid data packet to reserve the wireless channel for an RD transmission (as an implicit ACK) by extending the transmitter's TXOP time, without contending for channel access.…”

Network Coding and Duty Cycling in IEEE 802.11 Wireless Networks with Bidirectional Transmissions and Sleeping Periods

“…In addition, and for the purpose of comparison, the performance of GreenCode has been compared to those of the DCF and DCF with NC, referred to as DCF+NC hereafter. The performance results of these protocols have been presented in our previous works [8], [9].…”