A Novel Distributed Asynchronous Multichannel MAC Scheme for Large-Scale Vehicular Ad Hoc Networks

Abstract

This paper proposes an analytical model for the throughput of the Enhanced Distributed Channel Access (EDCA) mechanism in IEEE 802.11p MAC sub-layer. Features in EDCA such as different Contention Windows (CW) and Arbitration Interframe Space (AIFS) for each Access Category (AC), and internal collisions are taken into account. The analytical model is suitable for both basic access and the Request-To-Send/Clear-To-Send (RTS/CTS) access mode. The proposed analytical model is validated against simulation results to demonstrate its accuracy.

Adaptive Network Segmentation and Channel Allocation in Large-Scale V2X Communication Networks

“…The IEEE 1609.4 extension adopts a synchronous switching between control channel and service channels. It is shown that synchronous operation of the MAC sub-layer is an inherently poor utilisation of the DRAFT July 29, 2018 SUBMITTED PAPER 3 bandwidth ( [11], [23], [24]). To mitigate the poor bandwidth utilisation problem of synchronous multi-channel MACs, asynchronous multi-channel MACs were proposed (surveyed in [17]).…”

“…This was further enhanced by introducing hopping sequence to schedule multiple parallel rendezvous [18], applying Pulse/Tone exchanges prior to handshake for collision avoidance on the control channel [19]. In our previous work [11], we proposed a novel distributed asynchronous multichannel MAC scheme in favour of high network load and multiple simultaneous transmissions via Distributed-TDMA mechanism and enhanced channel utilisation. It outperforms well-known existing asynchronous multi-channel MAC schemes such as [7], [8] and [21].…”

“…However, none of these aforementioned ( [7], [8], [11], [18] and [19]) asynchronous multichannel MAC schemes address the challenges arising from large-scale networks, i.e., achieving comparable system performance as they do in single-hop scenarios ( [4], [5], [6]). Simulation results from both literature [4] and this work (as shown in Sec.…”

“…In this paper, we propose an efficient MAC scheme for large-scale dense networks, that can work on top of asynchronous multi-channel MAC schemes, such as [7], [8] and [11]. The proposed technique exploits cooperation of infrastructures such as Road Side Units (RSUs) and centralised network controlling server.…”

“…It is worth noting that different from existing work, this proposed segmentation approach adapts to the network status (e.g., node density) and integrates with the asynchronous multi-channel extensions of the IEEE 802.11p MAC sub-layer. When a [21], [8] and [11] in large-scale dense vehicular networks, in terms of (aggregate/normalised) throughput, multi-hop dissemination delay (i.e., end-to-end delay between two nodes in non-adjacent segments), and the fast penetration capability 1 .…”