Abstract

The vehicular ad-hoc network (VANET) based on dedicated short-range communication (DSRC) is a distributed communication system, in which all the nodes share the wireless channel with carrier sense multiple access/collision avoid (CSMA/CA) protocol. However, the competition and backoff mechanisms of CSMA/CA often bring additional delays and data packet collisions, which may hardly meet the QoS requirements in terms of delay and packets delivery ratio (PDR). Moreover, because of the distribution nature of security information in broadcast mode, the sender cannot know whether the receivers have received the information successfully. Similarly, this problem also exists in no-acknowledge (non-ACK) transmissions of VANET. Therefore, the probability of packet collisions should be considered in broadcast or non-ACK working modes. This paper presents a connection-level scheduling algorithm overlaid on CSMA/CA to schedule the start sending time of each transmission. By converting the object of reducing collision probability to minimizing the overlap of transmission durations of connections, the probability of backoff-activation can be greatly decreased. Then the delay and the probability of packet collisions can also be decreased. Numerical simulations have been conducted in our unified platform containing SUMO, Veins and Omnet++. The result shows that the proposed algorithm can effectively improve the PDR and reduce the packets collision in VANET.

Highlights

  • Vehicular ad-hoc network (VANET) with inter-vehicle communication is an emerging technology for efficient safety and entertainment information dissemination

  • We propose a new approach about connections scheduling to improve the performance of data transmission in VANET, in which a connection consists of a sending node and a receiving node

  • Due to the adoption of carrier sense multiple access with collision avoidance (CSMA/CA) in IEEE 802.11p standard, there are higher possibilities of packet collisions and unbounded delay in VANET, there are a plethora of studies in the scope of media access control (MAC) layer protocol to improve the performance of VANET, such as overlay

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Summary

INTRODUCTION

Vehicular ad-hoc network (VANET) with inter-vehicle communication is an emerging technology for efficient safety and entertainment information dissemination. DSRC is essentially a distributed communication system, and all connections in the system share the wireless channel, that is why a competition mechanism, carrier sense multiple access with collision avoidance (CSMA/CA), is adopted here. We propose a new approach about connections scheduling to improve the performance of data transmission in VANET, in which a connection consists of a sending node and a receiving node. The transmission means that a set of data packets are transmitted continuously from sender to receiver through a connection and transmission is the scheduling unit of the proposed algorithm. Main contributions of this work are summarized as follows: Based on the VANET framework, a new overlaybased scheduling strategy is proposed to schedule the start-sending time of each transmission for maximizing the packet delivery ratio (PDR) and avoiding allocation issues of time slot. A transmission scheduling greedy search (TSGS) algorithm is proposed to avoid high time complexity

RELATE WORK
SYSTEM FRAMEWORK AND PROPOSED ALGORITHM
PERFORMANCE EVALUATION
Simulation Setup
Simulation Results
Findings
CONCLUSION
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