Autonomous TDMA Alignment for VANETs

Date Added: Aug 2012
Format: PDF

The problem of local clock synchronization is studied in the context of Media Access Control (MAC) protocols, such as Time Division Multiple Access (TDMA), for dynamic and wireless ad hoc networks. In the context of TDMA, local pulse synchronization mechanisms let neighboring nodes align the timing of their packet transmissions, and by that avoid transmission interferences between consecutive timeslots. Existing implementations for Vehicular Ad-Hoc NETworks (VANETs) assume the availability of common (external) sources of time, such as base-stations or Geographical Positioning Systems (GPS). This paper is the first to consider autonomic design criteria, which are imperative when no common time sources are available, or preferred not to be used, due to their cost and signal loss.