为了提高Ad hoc网络中高等级节点的接入能力,提出了一种新的二进制负指数退避算法,该算法中高等级节点在分组发送成功时将竞争窗口设为普通节点的最小竞争窗口,在发生碰撞时竞争窗口随着退避次数的增加而呈负指数规律减小.仿真结果表明,该算法能够显著提高高等级节点的接入能力,提高了其业务吞吐量,并降低了端到端传输时延。
In order to increase the access ability of high-level node in wireless ad hoc network, a novel binary negative exponential backoff (BNEB) algorithm is proposed. In this algorithm, the high-level node sets its contention window (CW) to the minimum CW of normal nodes after successful transmission, and reduces its CW as times of retransmission increased. The simulation results show that the BNEB algorithm can remarkably increase the access ability of high-level node and reduce the end-to-end delay.