which can ensure node to contend the channel fairness. According to the sending time of RTS packet, the protocol uses RTS Contention Phase (RTS CP) to determine the earliest transmitter of RTS in order to satisfy spatial fairness. On the other hand, our protocol postpones the transmission of CTS packet by CTS Delay Phase (CTS DP) to avoid collision. Above all, we adopt adaptive RTS CP and CTS DP to reduce delay. In addition, contention back-off mechanism is added to increase fairness further. The simulation results show that RET-MAC not only achieves higher fairness and lower delay, but also has better throughput and energy efficiency.
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