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针对基于CSMA/CA协议的分簇传感器网络,提出了一种新的退避算法.首先通过把资源分配看成效用最大化的优化模型,说明了簇内传感器节点争用信道的退避窗口应该具有同样大小;然后在假定簇内各个节点有一样的退避窗口的基础上,通过最小化节点间的冲突概率,得到了簇内节点的最优退避窗口值和节点个数之间的关系.由此提出了一种基于最优共享退避窗口的重传算法,仿真结果表明本算法较传统的二进指数算法具有较少的冲突,能够减少传输时延、提高吞吐量,同时也是能量有效的.
Aiming at CSMA / CA based clustered sensor network, a new back-off algorithm is proposed.Firstly, resource allocation is regarded as the optimization model with maximized utility, which shows that the backoff window of contention channel in sensor nodes in cluster should have the same Then, based on the assumption that all nodes in a cluster have the same backoff window, the optimal backoff window value and the number of nodes in a cluster are obtained by minimizing the probability of collision among nodes. A retransmission algorithm based on the optimal shared backoff window is proposed. The simulation results show that the proposed algorithm has less conflict than the traditional binary index algorithm, which can reduce the transmission delay, increase the throughput, and is also energy efficient.