Journal
AD HOC NETWORKS
Volume 24, Issue -, Pages 200-213Publisher
ELSEVIER
DOI: 10.1016/j.adhoc.2014.09.002
Keywords
Full duplex communications; Medium access control; Orthogonal frequency division multiple access (OFDMA)
Funding
- ZTE Cooperation
- Oriental Scholar Program of Shanghai Municipal Education Commission
- National Natural Science Foundation of China (NSFC) [61172066]
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Random medium access control (MAC) plays a critical role in OFDMA wireless networks to support services with bursty traffic. However, the existing OFDMA random access protocols suffer from low efficiency due to the constraints in half-duplex communications. In this paper, the capability of full-duplex communications is leveraged to propqse novel mechanisms such as full duplex carrier sensing, collision detection, and collisioh jamming. With these mechanisms, a full-duplex carrier sense multiple access with collision detection (FD-CSMA/CD) protocol is developed for OFDMA wireless networks. It is based on a hierarchical design: (1) with full-duplex communications, operation of subchannels is decoupled, and a CSMA/CD-like protocol is implemented in each subchannel as a random access scheme; (2) on top of random access per-subchannel, a simple but effective subchannel selection scheme is executed locally on each client to harvest multi-user diversity. Both theoretical analysis and simulations are carried out to validate the effectiveness and efficiency of our protocol. (C) 2014 Elsevier B.V. All rights reserved.
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