中圖分類號：TP393
文獻標識碼： A
DOI： 10.19358/j.issn.2096-5133.2022.06.014
引用格式： 程凱，張信明. 分布式VANETs中車流自適應的低沖突TDMA-MAC協(xié)議[J].信息技術與網(wǎng)絡安全，2022，41(6)：84-93.

A traffic adaptive and low collision TDMA-MAC protocol in distributed VANETs

Abstract： In distributed vehicular ad hoc networks, the dynamically changing two-way traffic flow seriously affects the collision reduction effect of Time Division Multiple Access based Medium Access Control(TDMA-MAC) protocol using the slot grouping scheme, and the security and reliability of the overall protocol. To this end, a traffic adaptive and low collision TDMA-MAC protocol, named TALC-MAC, is designed. The slot occupancy rate is used as the judgment basis for group adjustment, and a detailed group expansion and contraction strategy is designed to adapt to the actual distribution of traffic flow. The intra-frame slot grouping scheme and the node reservation slot strategy are optimized to further reduce the probability of collision in the network. The simulation results show that TALC-MAC can effectively adapt to the dynamic changes of two-way traffic flow, and maintain the low-collision characteristic of the protocol.

Key words : TDMA mechanism；slot occupancy rate；merge collision rate；vehicular ad hoc networks