A Novel WLAN Vehicle-To-Anything (V2X) Channel Access Scheme for IEEE 802.11p-Based Next-Generation Connected Car Networks

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.

An Efficient Backoff Procedure for IEEE 802.11ax Uplink OFDMA-Based Random Access

“…Additionally, the average channel access delay increases proportionally to the data frame length. Therefore, for urgent transmissions, large data frames should either be avoided or dedicated RUs should be set aside for delay-intolerant data as proposed, e.g., in [25]. Finally, similar dependencies can be observed for other UORA types because this is a result of data vs. overhead length.…”

“…The second most popular topic is the coexistence of random access and scheduled access [11]- [15]. Other works propose novel MAC protocols [16], [17], extend UORA to provide deterministic channel access [18]- [20], introduce efficient channel schedulers [21], or modifying UORA version to support Vehicle-to-Anything (V2X) communication [25]. These are mainly theoretical studies verified by simulations.…”

“…V2X UORA-based channel access for dense IEEE 802.11p connected car networks is addressed in [25]. It is proposed that dedicated RUs should be used for high priority sensor stations gathering traffic information and transmitting periodical reports to V2X infrastructure.…”

Distributed Triggered Access for BSM Dissemination in 802.11bd V2V Networks

“…As discussed in Section 2, since an ideal physical channel condition is assumed, the packet error rate and the mobility of VSTAs are not considered, the main focus is the performance impact of packet collision given the VSTA density varies from 0.03 to 0.12. Following the typical characteristics of BSM traffic employed in related works [21,26,27,33,42], 200 Bytes payload size and 10 Hz arrival rate BSM traffic is considered to be moderate data traffic in the simulation. In addition, in order to emulate future platooning environments with higher requirements, 400 Bytes payload size and 20 Hz arrival rate BSM traffic is used for the simulation as heavy data traffic.…”

“…Yang et al proposed a Markov chain analysis of TUA Uplink Orthogonal Frequency Division Multiple Access (OFDMA) Random Access (UORA) in saturated traffic condition [32]. In [33], a V2I channel access scheme using TUA was proposed.…”