Journal of Xidian University

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Medium access control mechanism and performance analysis  for in band full duplex wireless networks

SUN Yanjing;QU Qianqian;WANG Bowen;ZUO Haiwei;WANG Xiaolin   

  1. (School of Information and Control Engineering, China Univ. of Mining and Technology, Xuzhou 221008, China)
  • Received:2017-04-19 Online:2018-06-20 Published:2018-07-18

Abstract:

This paper considers an in-band full-duplex wireless network that consists of an AP with full-duplex capability and multiple clients without full-duplex capability. When AP initiates a channel access request, the uplink of the AP is in the idle state in the data transmission stage, which limits the increase of network throughput. Therefore, a new MAC mechanism called Asymmetrical Full Duplex (AFD) is proposed, which can establish an asymmetric IBFD bidirectional link through primary channel access. No matter what node wins the channel, the mechanism can ensure that the uplink flow and the downlink flow of the AP communicate simultaneously at the same frequency. In this way, the throughput of the wireless network is greatly improved. Both analysis and numerical simulations are carried out to evaluate the performance of the proposed MAC mechanism. The results show that the throughput of the AFD-MAC is nearly doubled compared with the RTS/CTS mechanism.

Key words: wireless networks, in-band full-duplex, MAC mechanism, throughput, performance analysis