Generalized CSMA/CA Protocol for OFDMA Systems

In this paper, we present a multi-channel carrier sense multiple access with collision avoidance (CSMA/CA) protocol for orthogonal frequency division multiple access (OFDMA) systems. The protocol exploits the OFDMA system features that multiple stations can transmit simultaneously on different subchannels and the stations can obtain the channel information of all the sub-channels at each time instant. It is designed to enable the stations to contend with each other for channel access both in time and frequency domains through a two-dimensional backoff scheme. By adopting this two-dimensional backoff, the protocol takes a generalized form of the conventional single-channel CSMA/CA protocol: It allows to segment the channel bandwidth into multiple narrow-band random access channels and adjust the transmission probability according to the multichannel activity in a flexible manner. The simulation and analysis results reveal that the proposed system performs far better than the single-channel CSMA/CA system while using the same total bandwidth.

[1]  Byeong Gi Lee,et al.  Generalized CSMA/CA for OFDMA systems: protocol design, throughput analysis, and implementation issues , 2009, IEEE Transactions on Wireless Communications.

[2]  Marco Conti,et al.  Dynamic tuning of the IEEE 802.11 protocol to achieve a theoretical throughput limit , 2000, TNET.

[3]  Byeong Gi Lee,et al.  An analysis on the state-dependent nature of DS/SSMA unslotted ALOHA , 2006, Journal of Communications and Networks.

[4]  Yunghsiang Sam Han,et al.  Analyzing multi-channel medium access control schemes with ALOHA reservation , 2006, IEEE Transactions on Wireless Communications.

[5]  Shu-Ping Chang,et al.  Multiple packet multiple channel CSMA/CD protocols for local area networks , 1989, IEEE INFOCOM '89, Proceedings of the Eighth Annual Joint Conference of the IEEE Computer and Communications Societies.

[6]  Young-June Choi,et al.  Multichannel random access in OFDMA wireless networks , 2006, IEEE Journal on Selected Areas in Communications.

[7]  Samir R. Das,et al.  Multichannel CSMA with signal power-based channel selection for multihop wireless networks , 2000, Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152).

[8]  A. Girotra,et al.  Performance Analysis of the IEEE 802 . 11 Distributed Coordination Function , 2005 .

[9]  Wei Yin,et al.  Multi-channel MAC for ad hoc networks , 2006 .