关键词: 入网时延, 帧结构优化, 时分多址（TDMA）, 媒体介质访问控制（MAC）协议, Ad Hoc

Abstract: 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.

Key words: access delay, frame structure optimization, Time Division Multiple Access（TDMA）, Media Access Control（MAC）, Ad Hoc