Conference Paper

Dynamic Adaptation of Joint Transmission Power and Contention Window in VANET

Dept. of Electr. & Comput. Eng., Old Dominion Univ., Norfolk, VA, USA
DOI: 10.1109/VETECF.2009.5378793 Conference: Vehicular Technology Conference Fall (VTC 2009-Fall), 2009 IEEE 70th
Source: IEEE Xplore

ABSTRACT In this paper, we propose an algorithm for joint adaptation of transmission power and contention window to improve the performance of vehicular network in a cross layer approach. The high mobility of vehicles in vehicular communication results in the change in topology of the Vehicular Ad-hoc Network (VANET) dynamically, and the communication link between two vehicles might remain active only for short duration of time. In order for VANET to make a connection for long time and to mitigate adverse effects due to high and fixed transmission power, the proposed algorithm adapts transmission power dynamically based on estimated local traffic density. In addition to that, the prioritization of messages according to their urgency is performed for timely propagation of high priority messages to the destination region. In this paper, we incorporate the contention based MAC protocol 802.11e enhanced distributed channel access (EDCA) mechanism to implement a priority-based vehicle-to-vehicle (V2V) communication. Simulation results show that the proposed algorithm is successful in getting better throughput with lower average end-to-end delay than the algorithm with static/default parameters.

  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper investigates the minimum transmit power required to ensure network connectivity in a Vehicular Ad Hoc Network (VANET). As opposed to the conventional graph theoretic approach, in this paper, the network connectivity problem is analyzed according to a physical layer based quality of service (QOS) constraint. Under this approach, a multi-hop path joining a pair of vehicles in the network is considered to be connected, if and only if the average route bit error rate corresponding to this path is less than or equal to a tolerable limit. The analytical results for the minimum transmit power are corroborated by extensive simulation studies.
    Fourth International Conference on Communication Systems and Networks, COMSNETS 2012, Bangalore, India, January 3-7, 2012; 01/2012
  • [Show abstract] [Hide abstract]
    ABSTRACT: Vehicular network for intelligent transportation systems is emerging concept to improve transportation security, reliability, and management. Vehicular networks are expected to utilize wide range of wireless networks and services that enables vehicular users to enjoy all kinds of services on the road. The highly dynamically changing topology because of high mobility of vehicular nodes is the main challenges in formulating efficient method for switching channel and data rate for vehicular users. This paper presents a novel game theoretic approach to achieve higher throughput for vehicular users by changing wireless networks/channels and data rate in heterogeneous wireless networks. The performance of the proposed scheme is illustrated with the help of simulation results.
    Broadband, Wireless Computing, Communication and Applications (BWCCA), 2012 Seventh International Conference on; 01/2012
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In vehicular ad hoc networks, the dynamic change in transmission power is very effective to increase the throughput of the wireless vehicular network and decrease the delay of the message communication between vehicular nodes on the highway. Transmission range is directly proportional to the transmission power the moving node. If the transmission power will be high, the interference increases that can cause higher delay in message reception at receiver end, hence the performance of the network decreased. In this paper, it is analyzed that how transmission power can be controlled by considering other different parameter of the network such as; density, distance between moving nodes, different types of messages dissemination with their priority, selection of an antenna also affects on the transmission power. The dynamic control of transmission power in VANETs serves also for the optimization of the resources where it needs, can be decreased and increased depending on the circumstances of the network. Different applications and events of different types also cause changes in transmission power to enhance the reach-ability. The analysis in this paper is comprised of density, distance with single hop and multi-hop message broadcasting based dynamic transmission power control as well as antenna selection and applications based. Some summarized tables are produced according to the respective parameters of the vehicular network. At the end some valuable observations are made and discussed in detail. This paper concludes with a grand summary of all the protocols discussed in it.

Full-text (2 Sources)

Available from
May 29, 2014