Cognitive Self-Scheduled Mechanism for Access Control in Noisy Vehicular Ad Hoc Networks

Abstract

Within the challenging environment of intelligent transportation systems (ITS), networked control systems such as platooning guidance of autonomous vehicles require innovative mechanisms to provide real-time communications. Although several proposals are currently under discussion, the design of a rapid, efficient, flexible, and reliable medium access control mechanism which meets the specific constraints of such real-time communications applications remains unsolved in this highly dynamic environment. However, cognitive radio (CR) combines the capacity to sense the radio spectrum with the flexibility to adapt to transmission parameters in order to maximize system performance and has thus become an effective approach for the design of dynamic spectrum access (DSA) mechanisms. This paper presents the enhanced noncooperative cognitive division multiple access (ENCCMA) proposal combining time division multiple access (TDMA) and frequency division multiple access (FDMA) schemes with CR techniques to obtain a mechanism fulfilling the requirements of real-time communications. The analysis presented here considers the IEEE WAVE and 802.11p as reference standards; however, the proposed medium access control (MAC) mechanism can be adapted to operate on the physical layer of different standards. The mechanism also offers the advantage of avoiding signaling, thus enhancing system autonomy as well as behavior in adverse scenarios.

A Secure Enhanced Non-Cooperative Cognitive Division Multiple Access for Vehicle-to-Vehicle Communication

“…The SIMITS [13] simulator tool is used for experimental evaluation. The Proposed S − ENCCMA and existing ENCCMA [15] algorithm are written in C# object-oriented programing language using the Visual studio framework 4.5, 2012. The S − ENCCMA and city, highway, and rural radio propagating environment model [Ours] is incorporated into the SIMITS tool [16][17][18][19][20].…”

“…This work presents a secure enhanced non-cooperative cognitive division multiple access (S − ENCCMA) model using a commutative RSA cryptography mechanism. This S − ENCCMA adopts the enhanced non-cooperative cognitive division multiple access (ENCCMA) [15] real-time MAC (Medium Access Control) communication protocol. To provision real-time access, the ENCCMA combines Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), and the Cognitive Radio (CR) technique.…”

Selective Mac for Obstacle Aware Cev Environmental Model for Vanet (V2v)

“…When considering topology changes for CSMA/CA the Slotted-Aloha prototype doesn't need signaling or reconfiguration, the drawback of this protocol is that collision level is high and it is not suitable for high priority services. In order to guarantee bounded medium access delay for SITS based application services there a several cognitive radio CR base MAC model that have been proposed such as NCCMA [12], here by applying CR techniques every automobile user stores information about the occupancy estimation of each slot. This info was then adopted to find the best slot to perform the data communication needs for various application services.…”

“…Our model can also be used to compute the frame loss due to Collison and noise. In next section the experiment are conducted to evaluate the performance of Proposed CEV-AMAC and the results are compared with exiting MAC [12] [16] [9] [4]. A comparison of these existing model is shown in Table.1.…”

“…From all three environment model in Fig.2, Fig.3 and Fig.4 it can be seen that throughput achieved is increased with increasing number of vehicle for both the proposed AMAC and existing NCCMA algorithm [12] and the simulation value obtained in Mbps is tabulated in below Table.2. (20, 40 and 80) for our CEV environmental model and from analysis we observed that the achieved throughput in case of city is high as compared to village and expressway.…”