Reliable MAC broadcast protocol in directional and omni-directional transmissions for vehicular ad hoc networks

Yadumurthy, Ravi M.; Adithya, C H; Sadashivaiah, M.; Makanaboyina, Ranga

doi:10.1145/1080754.1080757

Cited by 76 publications

(33 citation statements)

References 3 publications

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“…Thus the need for a MAC protocol which solves the BCAD problem as it arises with cohorts. Previous work on directional MAC protocols is mostly aimed at ad hoc sensor networks (mobility is not considered), with few exceptions [24,25,26]. Most often, these MAC protocols rest on the RTS/CTS scheme proper to V2V communication standards, which makes them unsuitable.…”

Section: Time-bounded Terminationmentioning

confidence: 99%

Safety in Vehicular Networks—on the Inevitability of Short-Range Directional Communications

Lann

2015

Ad-Hoc, Mobile, and Wireless Networks

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Section: Time-bounded Terminationmentioning

confidence: 99%

Safety in Vehicular Networks—on the Inevitability of Short-Range Directional Communications

Lann

2015

Ad-Hoc, Mobile, and Wireless Networks

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“…For vehicular networks, several MAC protocols adopt directional antennas and achieve network performance improvement as in [35][36] [37]. However, investigations of the performance and the suitability for VANETs show that, even though directional MAC protocols improve the performance by reducing collisions and increasing channel reusability, complexity and difficulties of providing practical implementation are the major issues of directional MAC in VANETs.…”

Section: Directional Antenna-based Macmentioning

confidence: 99%

Mobility impact in IEEE 802.11p infrastructureless vehicular networks

2012

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Vehicular ad hoc networks (VANETs) are an extreme case of mobile ad hoc networks (MANETs). High speed and frequent network topology changes are the main characteristics of vehicular networks. These characteristics lead to special issues and challenges in the network design, especially at the medium access control (MAC) layer. Due to high speed of nodes and their frequent disconnections, it is difficult to design a MAC scheme in VANETs that satisfies the quality-of-service requirements in all networking scenarios.In this thesis, we provide a comprehensive evaluation of the mobility impact on the IEEE 802.11p MAC performance. The study evaluates basic performance metrics such as packet delivery ratio, throughput, and delay, as well as the impact of mobility factors. The study also presents a relation between the mobility factors and the respective medium access behavior. Moreover, a new unfairness problem according to node relative speed is identified for both broadcast and unicast scenarios. To achieve better performance, we propose two dynamic contention window mechanisms to alleviate network performance degradation due to high mobility. Extensive simulation results show the significant impact of mobility on the IEEE 802.11p MAC performance, an identification of a new unfairness problem in the vehicle-to-vehicle (V2V) communications, and the effectiveness of the proposed MAC schemes.iii Acknowledgements I would like to express my deepest appreciation and gratitude to my supervisor Professor Weihua Zhuang for her guidance, support, and share of knowledge. Professor Zhuang can be considered as a role model for the professional academic supervisor. She gave me the opportunity to choose the topic of my Master's research, and provided me with invaluable suggestions and advice. She always inspired me when discussing research problems. In addition to her solid knowledge that enriched my research, she was always available, professional, helpful, and extremely nice. Her extraordinary commitment to the excellence of research made the opportunity to work with her a true reward of my Master's research.

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“…The bandwidth can reach 54 Mbps. Many single-channel [3], [4] and [5] MAC protocols have been developed for VANET, where all vehicles share a single communication channel in the network. Wireless Access in Vehicular Environments (WAVE) MAC utilises a contentionbased access using Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Collision Free Protocol for VANET

Samara¹

2018

IJCA

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VANET is considered as one of the most important research field in the wireless and mobile technology, which provides road safety, updated traffic information, and infotainment. The transmission technology used in VANET is the wireless broadcast which means that the vehicles on the road are sharing a single communication channel for broadcasting the messages, usually VANET suffers from the number of nodes consisting and competing to reserve and use the channel, and this leads to high collision scenarios if the situations are not managed wisely.In this research a new collision free protocol hereinafter will be called (CF-MAC) to manage the channel access in Medium Access Control Sublayer (MAC) for the transmission will be proposed, this protocol will ensure a collision-free management to enhance the channel performance, and increase the channel reliability. The evaluation criteria will depend on the QoS enhancement like channel throughput, message delay, and message loss; the results show that the overall channel performance in terms of collision and packet loss ratio is improved. KeywordsVANET, Collision free, Message broadcasting,, CF-MAC. One of the reasons why standardization is moving towards the adoption of IEEE 802.11p [7] (or its European counterpart ETSI-G5 [8]) for this purpose is that the behaviour of the 802.11 family is well known. However, existing unicast 802.11 models are not directly applicable to the VANET scenarios. INTRODUCTIONBeacons are transmitted using the CSMA/CA Broadcast method [9]. Hence it is critical to managing MAC layer behaviour correctly. When designing a model for beaconing in VANETs, the model was presented in [10] and covered the entire saturation spectrum. Even though [10] modelled EDCA, the backoff counter decrement behaviour is that of the DCF. When removing the CW and AIFS differentiation, an accurate model of the DCF remains.The original IEEE 802.11, was designed for wireless local area networking (WLAN), has two drawbacks within its medium access control (MAC) technique carrier sense multiple access (CSMA): as it may cause delay before channel access, the other problem is the channel collision.The MAC protocol decides who can reserve the shared channel to transmit when there is a competition for it. In a carrier sense systems, such as CSMA, each sender first listens to the channel and if there is no one is sending for a certain time period, the node transmits directly, at the same time there is a possibility that another node is transmitting and this results in a collision on the channel. Moreover, a node may experience very long channel access delays due to the risk of the channel being busy during its listening period. These two situations occur primarily during high utilization periods in the network. CSMA is used by the whole IEEE802.11 family as well as its wired counterpart IEEE 802.3Ethernet. One of the reasons for the success of both WLAN and Ethernet is the straightforward implementation of the standard resulting in reasonably priced equipment. Due to th...

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Reliable MAC broadcast protocol in directional and omni-directional transmissions for vehicular ad hoc networks

Cited by 76 publications

References 3 publications

Safety in Vehicular Networks—on the Inevitability of Short-Range Directional Communications

Safety in Vehicular Networks—on the Inevitability of Short-Range Directional Communications

Mobility impact in IEEE 802.11p infrastructureless vehicular networks

An Efficient Collision Free Protocol for VANET

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