At the media access control (MAC) layer, the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards specifies channel access operations using carrier sensing multiple access with collision avoidance (CSMA/CA). The IEEE 802.11 MAC layer adopts enhanced distributed channel access (EDCA) to offer four different traffic classes or access categories. The key purpose of IEEE 802.11p MAC layer amendments is to enable efficient communication setups while significantly reducing the associated overheads. Traditional IEEE 802.11 MAC layer operations are too time consuming for wireless access in vehicular environments (WAVE). In the network simulator 2 (ns‐2) implementation MAC layer operations are modeled through six separate modules: transmission, reception, channel state manager, back‐off manager, transmission coordination, and reception coordination. The overhauled ns‐2 implementation allows to model greater details of frame transmission and reception operations. media access protocol; modelling; vehicular ad hoc networks
WAVE Media Access Control Layer
2012-10-05
11 pages
Article/Chapter (Book)
Electronic Resource
English
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