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rDCF: A Relay-Enabled Medium Access Control Protocol for Wireless Ad Hoc Networks
September 2006 (vol. 5 no. 9)
pp. 1201-1214
Hao Zhu, IEEE
It is well known that IEEE 802.11 provides a physical layer multirate capability and, hence, MAC layer mechanisms are needed to exploit this capability. Several solutions have been proposed to achieve this goal. However, these solutions only consider how to exploit good channel quality for the direct link between the sender and the receiver. Since IEEE 802.11 supports multiple transmission rates in response to different channel conditions, data packets may be delivered faster through a relay node than through the direct link if the direct link has low quality and low rate. In this paper, we propose a novel MAC layer relay-enabled distributed coordination function (DCF) protocol, called rDCF, to further exploit the physical layer multirate capability. We design a protocol to assist the sender, the relay node, and the receiver to reach an agreement on which data rate to use and whether to transmit the data through a relay node. Considering various issues, such as, bandwidth utilization, channel errors, and security, we propose techniques to further improve the performance of rDCF. Simulation results show that rDCF can significantly reduce the packet delay, improve the system throughput, and alleviate the impact of channel errors on fairness.

[1] M.S. Alouini and A. Goldsmith, “Adaptive Modulation over Nakagami Fading Channels,” Wireless Personal Comm., pp. 119-143, May 2000.
[2] B. Awerbuch, D. Holmer, and H. Rubens, “High Throughput Route Selection in Multi-Rate Ad Hoc Wireless Networks, Wireless On-Demand Network Systems,” ACM/Kluwer Mobile Networking and Applications (MONET), Jan. 2004.
[3] V. Bharghavan, A.J. Demers, S. Shenker, and L. Zhang, “A Media Access Protocol for Wireless LANs,” Proc. ACM Sigcomm Conf., pp. 212-225, Sept. 1994.
[4] G. Bianchi, “Performance Analysis of the IEEE 802.11 Distributed Coordination Function,” IEEE J. Selected Areas in Comm., pp. 535-547, Mar. 2000.
[5] L. Buttyan and J.P. Hubaux, “Stimulating Cooperation in Self-Organizing Mobile Ad Hoc Networks,” ACM/Kluwer Mobile Networks and Applications (MONET), Oct. 2003.
[6] D.S.J. DeCouto, D. Aguayo, J. Bicket, and R. Morris, “A High-Throughput Path Metric for Multihop Wireless Routing,” Proc. ACM Mobicom Conf., pp. 134-146, Sept. 2003.
[7] J. Gomez, A.T. Campbell, M. Naghshineh, and C. Bisdikian, “Conserving Transmission Power in Wireless Ad Hoc Networks,” Proc. IEEE Int'l Conf. Network Protocols (ICNP), Nov. 2001.
[8] VINT Group, “UCB/LBNL/VINT Network Simulator— ns (Version 2),” http://mash.cs.berkeley.eduns, 2004.
[9] G. Holland, N. Vaidya, and P. Bahl, “A Rate-Adaptive MAC Protocol for Multihop Wireless Networks,” Proc. ACM Mobicom Conf., pp. 236-251, July 2001.
[10] Y. Hu, A. Perrig, and D.B. Johnson, “Ariadne: A Secure On-Demand Routing Protocol for Ad Hoc Networks,” Proc. ACM Mobicom Conf., pp. 12-23, Sept. 2002.
[11] IEEE, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Spec,” IEEE 802.11 Standard, 1999.
[12] Agere Systems Inc., “WaveLAN 802.11b Chipset for Standard Form Factors,” , 2002.
[13] D. Johnson and D. Maltz, “Dynamic Source Routing in Ad Hoc Wireless Network,” Mobile Computing, pp. 153-181, 1996.
[14] A. Kamerman and L. Monteban, “WLAN-II: A High-Performance Wireless LAN for the Unlicensed Band,” Bell Labs Technical J., Summer 1997.
[15] C. Kaufman, R. Perlman, and M. Speciner, Network Security: Private Communication in a Public World, second ed. Prentice Hall, 2002.
[16] UCLA Parallel Computing Lab, “GloMoSim,” http://pcl.cs.ucla. edu/projectsglomosim /, 2004.
[17] H. Luo, R. Ramjee, P. Sinha, L. Li, and S. Lu, “UCAN: A Unified Cellular and Ad-Hoc Network Architecture,” Proc. ACM Mobicom Conf., pp. 353-367, Sept. 2003.
[18] S. Marti, T. Giuli, K. Lai, and M. Baker, “Mitigating Routing Misbehavior in Mobile Ad Hoc Networks,” Proc. ACM Mobicom Conf., 2000.
[19] R. Punnoose, P. Nikitin, and D. Stancil, “Efficient Simulation of Ricean Fading within a Packet Simulator,” Proc. IEEE Vehicular Technology Conf., pp. 764-767, Sept. 2000.
[20] T.S. Rappaport, Wireless Communications: Principle and Practice. Prentice Hall, 1996.
[21] B. Sadeghi, V. Kanodia, A. Sabharwal, and E. Knightly, “Opportunistic Media Access for Multirate Ad Hoc Networks,” Proc. ACM Mobicom Conf., pp. 24-35, Sept. 2002.
[22] Y. Seok, J. Park, and Y. Choi, “Multirate Aware Routing Protocol for Mobile Ad Hoc Networks,” Proc. IEEE Vehicular Technology Conf., pp. 22-25, Apr. 2003.
[23] K. Tang and M. Gerla, “MAC Reliable Broadcast in Ad Hoc Networks,” Proc. IEEE Military Comm. Conf. (MilCom), pp. 1008-1013, Oct. 2001.
[24] H. Zhu and G. Cao, “On Improving the Performance of IEEE 802.11 with Relay-Enabled PCF,” ACM/Kluwer Mobile Networking and Applications (MONET), vol. 9, pp. 423-434, 2004.

Index Terms:
IEEE 802.11, MAC, wireless networks.
Hao Zhu, Guohong Cao, "rDCF: A Relay-Enabled Medium Access Control Protocol for Wireless Ad Hoc Networks," IEEE Transactions on Mobile Computing, vol. 5, no. 9, pp. 1201-1214, Sept. 2006, doi:10.1109/TMC.2006.137
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