快速动态时隙分配MAC协议的帧结构优化与分析

针对快速动态时隙分配（Fast Dynamic Slot Assignment，F-DSA）MAC协议不能处理多节点申请入网的问题，对其帧结构和入网算法进行了完善，提出了碰撞感知快速动态时隙分配（Collision aware Fast Dynamic Slot Assignment，CF-DSA）协议。在相同入网算法的前提下，提出了一种新的控制微时隙分布方式，得到了聚合碰撞感知快速动态时隙分配（Aggregate Collision aware Fast Dynamic Slot Assignment，ACF-DSA）协议，通过理论建模与数值分析，主要研究了采用两种不同帧结构的协议性能，发现ACF-DSA较CF-DSA降低了节点的入网竞争时延，且对变化的网络环境具有更好的适应性，表明聚合碰撞感知的帧结构有助于节点入网效率的提高。

Frame structure optimization and analysis of fast dynamic slot assign-ment MAC protocol

According to the problems that F-DSA can’t deal with the multinode’s reserves to access into the network, the CF-DSA（Collision aware Fast Dynamic Slot Assignment） MAC protocol is proposed to improve the frame structure and the access algorithm of F-DSA. Furthermore, based on the same algorithm, ACF-DSA（Aggregate Collision aware Fast Dynamic Slot Assignment） is proposed which has a new arrangement of control mini-time slot. Through the theoretical modeling and numerical analysis, the performance of two different frame structures is studied. The results of numerical analysis show that ACF-DSA has less competition delay than CF-DSA and has better adaptability for the changing network environment, which means that the aggregate collision awareness frame structure can improve the accessing efficiency.