Abstract
To support a massive number of connected cars, a novel channel access scheme for next-generation vehicle-to-anything (V2X) systems is proposed in this paper. In the design of the proposed scheme, two essential aspects are carefully considered: backward compatibility and massive V2X support. Since IEEE 802.11p-based V2X networks are already being deployed and used for intelligent transport systems, next-generation V2X shall be designed considering IEEE 802.11p-based V2X networks to provide backward compatibility. Since all future cars are expected to be equipped with a V2X communication device, a dense V2X communication scenario will be common and massive V2X communication support will be required. In the proposed scheme, IEEE 802.11-based extension is employed to provide backward compatibility and the emerging IEEE 802.11ax standard-based orthogonal frequency-division multiple access is adopted and extended to provide massive V2X support. The proposed scheme is further extended with a dedicated V2X channel and a scheduled V2X channel access to ensure high capacity and low latency to meet the requirements of the future V2X communication systems. To demonstrate the performance of the proposed scheme thoroughly and rigorously, the proposed scheme is mathematically analyzed using a Markov model and extensive simulations are performed. In the dense V2X communication networks of the future, the proposed V2X communication scheme will provide high performance and reliability.
Highlights
Connected cars are attracting attention increasingly and several commercial products for the connected car are expected in the near future
If the association ID (AID) of some resource unit (RU) is written in the special AID value, any STA receiving the UORA trigger frame counts the number of UORA RUs
If a channel is determined to be used for UORA transmission and time sync is calibrated by other frames transmitted by an intelligent transport systems (ITSs) access points (APs), a beacon frame or a new indication frame is sufficient and the trigger frame is not required for the UORA channel access procedure
Summary
Connected cars are attracting attention increasingly and several commercial products for the connected car are expected in the near future. Even though the actual coverage range is smaller than ideal coverage range of IEEE 802.11p-based system, the coverage range is sufficient to accommodate a large number of connected cars that could cause channel access problems in traffic jam scenarios because every car will be required to equip a V2X system in the near future [31,32,33]. ITS information may not require aproblems large sizeare of the frames These kinds of scalability most well-known problems of wireless networks. The random back-off delay to be minimized onlycollision solutionhas for aa large newcomer unlessHence, there were prior procedures such needs as an association or a scheduling, is notfor soan long relatively, butaccess the delay generated by random back-off after collision has a ordedicated eliminated effective channel resource scheduling, is not so longprocedure.
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