A Reliable MAC Protocol for Broadcast VANETs

Abstract

The design of efficient and reliable broadcast MAC layers for wireless mobile ad hoc networks (MANETs) -- especially when high user speeds are allowed -- is a current challenge. Despite the absence of infrastructure which would permit channel allocation, awareness techniques allow a certain channel assignment. This paper presents MAC layer protocol designed for broadcast MANETs called COMB (Cell-based Orientation-aware MANET Broadcast). In principle, COMB allows the realization of a collision free transmission, high speed is supported and no handshake is required. COMB is based on localization aware cross layer dimensioned CDMA cells, and uses the SOTDMA protocol as intra cell scheme, while the inter cell scheme relies on direction and speed awareness.