A Modified TDMA Traffic Model For Vehicular Ad-Hoc Networks
Shakeel Ahmed1, Humaira Nishat2

1Shakeel Ahmed, Department of ECE, CVR College of Engineering, Hyderabad (Telangana), India.
2Humaira Nishat, Department of ECE, CVR College of Engineering, Hyderabad (Telangana), India.
Manuscript received on 23 March 2019 | Revised Manuscript received on 04 April 2019 | Manuscript Published on 18 April 2019 | PP: 443-448 | Volume-7 Issue-6S March 2019 | Retrieval Number: F02860376S19/2019©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: Vehicular Ad hoc Networks (VANETS) is one type of mobile ad hoc networks wherein the data exchange takes place among vehicles. IEEE 802.11p is the standard which is used for Vehicle-to-Vehicle (V2V) communication and is also known as Wireless Access for Ve-hicular Environment (WAVE). Implementing this VANETs using computer simulations are required before its implementation on roads. These simulations include a combination of urban mobility simulation and network simulation. It is found through simulations that the MAC protocol in VANETs when the node density in the network is high gives a poor performance in terms of loss of data packets and jitter (delay) as collisions are encountered in the network. Thus to improve the performance Time Division Multiple Access (TDMA) schemes are introduced. However, it is difficult to implement and manage TDMA scheduling due to large network size ie., many nodes in the network, the nodes(vehicles) are mobile, and the highly varying topology of the network. Thus the paper presents a new modified clustered-based TDMA by introducing some priority conditions in the traffic. The traffic is divided into two with topmost and least priority and this is included in the MAC Header of TDMA. Simulations are carried out using Network Simulator 2 (NS2) and the evaluation results shows that the proposed cluster based model performs better even when high density network is considered with less amount of packet loss and delay.
Keywords: Delay; MAC; MANET; Packet Loss; Priority.
Scope of the Article: Probabilistic Models and Methods