A Disjoint Frame Topology-Independent TDMA MAC Policy for Safety Applications in Vehicular Networks (bibtex)
by Vasileios Dragonas, Konstantinos Oikonomou, Ioannis Stavrakakis
Abstract:
Medium access control (MAC) is a challenging problem in vehicular environments due to a constantly changing topology due to vehicle's mobility and stringent delay requirements, especially for safety-related applications (e.g., for vehicular-to-vehicular communication). Consequently, topology-independent TDMA MAC policies that guarantee a number of successful transmissions per frame independently of the underlying topology, can be regarded as a suitable choice for the particular vehicular environment. One such policy (TiMAC) is revisited and considered in this paper for a vehicular environment and is also extended to one that considers disjoint frames depending on the vehicle's direction of movement (d-TiMAC). Both TiMAC and d-TiMAC are evaluated against VeMAC --- a well-established TDMA MAC protocol in the area of vehicular networks --- based on simulations. It is observed that throughput under the considered TiMAC policy is close to that induced by VeMAC, whereas the number of retransmissions is reduced leading to a smaller time delay. Furthermore, the proposed d-TiMAC appears to achieve a higher throughput than VeMAC, and an even lower number of retransmissions (when compared to TiMAC), suggesting that d-TiMAC yields an even smaller time delay. Eventually, this observation is also supported when d-TiMAC is compared against TiMAC showing a further reduced number of retransmissions.
Reference:
Vasileios Dragonas, Konstantinos Oikonomou, Ioannis Stavrakakis, "A Disjoint Frame Topology-Independent TDMA MAC Policy for Safety Applications in Vehicular Networks", In Ad Hoc Networks, vol. 79, pp. 43 - 52, 2018.
Bibtex Entry:
@article{dragonas2018disjoint,
	Abstract = {Medium access control (MAC) is a challenging problem in vehicular environments due to a constantly changing topology due to vehicle's mobility and stringent delay requirements, especially for safety-related applications (e.g., for vehicular-to-vehicular communication). Consequently, topology-independent TDMA MAC policies that guarantee a number of successful transmissions per frame independently of the underlying topology, can be regarded as a suitable choice for the particular vehicular environment. One such policy (TiMAC) is revisited and considered in this paper for a vehicular environment and is also extended to one that considers disjoint frames depending on the vehicle's direction of movement (d-TiMAC). Both TiMAC and d-TiMAC are evaluated against VeMAC --- a well-established TDMA MAC protocol in the area of vehicular networks --- based on simulations. It is observed that throughput under the considered TiMAC policy is close to that induced by VeMAC, whereas the number of retransmissions is reduced leading to a smaller time delay. Furthermore, the proposed d-TiMAC appears to achieve a higher throughput than VeMAC, and an even lower number of retransmissions (when compared to TiMAC), suggesting that d-TiMAC yields an even smaller time delay. Eventually, this observation is also supported when d-TiMAC is compared against TiMAC showing a further reduced number of retransmissions.},
	Author = {Dragonas, Vasileios and Oikonomou, Konstantinos and Stavrakakis, Ioannis},
	Doi = {10.1016/j.adhoc.2018.06.006},
	Issn = {1570-8705},
	Journal = {Ad Hoc Networks},
	Keywords = {own, exceptional, refereed, olinet},
	Pages = {43 - 52},
	Title = {{{A Disjoint Frame Topology-Independent TDMA MAC Policy for Safety Applications in Vehicular Networks}}},
	Volume = {79},
	Year = {2018},
	Bdsk-Url-1 = {https://doi.org/10.1016/j.adhoc.2018.06.006}}
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