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Journal of Applied Sciences ›› 2012, Vol. 30 ›› Issue (1): 31-38.doi: 10.3969/j.issn.0255-8297.2012.01.006

• Communication Engineering • Previous Articles     Next Articles

Rate Adaptive Mechanism with Congestion Awareness of DCF Protocol in Ad Hoc Networks

LEI Lei1;2, ZHOU Jin-hua1, ZHU Ying-feng1, LIU Wei-kang1   

  1. 1. College of Electronic and Information Engineering, Nanjing University of Aeronautics
    and Astronautics, Nanjing 210016, China
    2. The 28th Research Institute, China Electronic Technology Corporation, Nanjing 210007, China
  • Received:2011-04-12 Revised:2011-06-16 Online:2012-02-09 Published:2012-01-30

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Abstract:

Abstract: We show why the carrier sense mechanism defined in IEEE 802.11DCF protocol does not support
adaptive multi-rate transmissions in a physical layer, and study the congestion problem in high speed and heavy
loaded multi-hop ad hoc networks. We then propose a rate adaptive mechanism with congestion awareness
of DCF protocol to overcome the congestion problem. According to the channel condition, the receiver can
choose the highest feasible transmission rate, and sends its chosen rate value and congestion information back to the sender. Based on the feedback information from the receiver, the sender can decide whether to transmit data packets or not. Simulation results show that the proposed protocol can effectively solve the congestion problem, and significantly improve the overall throughput of the network.

Key words: ad hoc networks, DCF protocol, multi-rate, congestion awareness

CLC Number: