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针对多跳ad hoc网络可用带宽预测算法展开研究,指出现有的两类可用带宽预测算法的局限性:主动探测算法发送的探测包会导致预测结果不准确,被动测量算法多用于单点监测,难以了解端到端的性能.针对上述局限性,对现有的被动测量算法进行改进,在DCF协议的基础上,提出基于节点可用时长的可用带宽预测算法.该算法首先定义链路可用带宽的上限值,接着通过计算收发节点可用时长不同步概率得到链路可用带宽的初步估计,最后通过讨论隐藏节点导致传输失败的两种情况对初步估计进行修正,得到最终的链路可用带宽.仿真实验验证了可用带宽预测算法的有效性和准确性.
Aiming at the available bandwidth prediction algorithm of multi-hop ad hoc network, the limitations of the two available bandwidth prediction algorithms are pointed out. The probe packets sent by the active detection algorithm will lead to inaccurate prediction results. The passive measurement algorithms are mostly used for single point monitoring, It is difficult to know the performance of end-to-end.According to the above limitations, the existing passive measurement algorithm is improved, and based on the DCF protocol, an available bandwidth prediction algorithm based on node available time is proposed.The algorithm first defines the upper available bandwidth of the link Then the initial estimate of the available bandwidth of the link is obtained by calculating the out-of-sync probabilities of the available time of the sending and receiving nodes. Finally, the preliminary estimation is modified by discussing the two cases that the hidden node leads to the failure of transmission, and finally the available bandwidth of the link is obtained. The validity and accuracy of the available bandwidth prediction algorithm are verified.