基于双忙音的可调功率无线MAC协议

Dual Busy Tones Aided MAC Protocols with Adjustable Power

本文基于IEEE802.11DCF提出了两种基于双忙音信号的无线自组织网络MAC协议,即恒定功率双忙音(FPDBT)和变功率双忙音(VPDBT)MAC协议。这两种协议能基本解决无线自组织网络大干扰范围下的隐藏终端和暴露终端问题。本文对MAC协议进行了理论分析,并建立了OPNET仿真模型。通过仿真试验分析比较了IEEE802.11DCF、DBTMA、FPDBT和VPDBTMAC协议的信道传输性能。结果表明两种改进协议都能在大干扰范围下有效避免分组冲突,并显著提高信道利用率。VPDBT协议还能够对信道空间复用率和分组冲突避免的性能有较好的折衷。

Based on IEEE 802.11 DCF, the proposed FPDBT（The Fixed Power Dual Busy Tone）and VPDBT（The Variable Power Du- al Busy Tone）MAC protocols apply dual busy tones to solve the hidden terminal problem and the exposed terminal problem in ad hoc networks with large interference range. This paper focuses on the performance analysis of the two proposed MAC protocols. Simulation models are implemented by using OPNET. The network performances of IEEE 802.11 DCF,DBTMA,FPDBT and VPDBT MAC pro- tocols are compared via simulation experiments, which verify that both of the two protocols are able to prevent the collisions during the transmission of data/ACK packets, and the VPDBT can balance the trade off between spatial reuse and collision avoidance.