Adaptive TDMA slot assignment protocol for vehicular ad-hoc networks

• Published in: Journal of China universities of posts and telecommunications Vol. 20; no. 1; pp. 11 - 18
• Main Authors: YANG, Wei-dong, LI, Pan, LIU, yan, ZHU, Hong-song
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2013
• Subjects: Ad hoc networks; Ad-hoc网络; adaptive frame length; Algorithms; binary tree; Channels; Collisions; Computer simulation; Frames; media access control (MAC) protocol; Networks; Position (location); slot assignment; TDMA; 信道利用率; 媒体访问控制协议; 时隙分配; 比例调整; 自适应; 车辆; adaptive frame length; binary tree; TDMA; media access control (MAC) protocol; slot assignment
• ISSN: 1005-8885
• DOI: 10.1016/S1005-8885(13)60002-3

This paper proposes a novel adaptive time division vehicular ad-hoc networks. ATSA divides different sets multiple access （TDMA） slot assignment protocol （ATSA） for of time slots according to vehicles moving in opposite directions. When a node accesses the networks, it choices a frame length and competes a slot based on its direction and location to communication with the other nodes. Based on the binary tree algorithm, the frame length is dynamically doubled or shortened, and the ratio of two slot sets is adjusted to decrease the probability of transmission collisions. The theoretical analysis proves ATSA protocol can reduce the time delay at least 20% than the media access control protocol for vehicular ad-hoc networks （VeMAC） and 30% than the ad-hoc. The simulation experiment shows that ATSA has a good scalability and the collisions would be reduced about 50% than VeMAC, channel utilization is significantly improved than several existing protocols.