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Title of Journal: Wireless Pers Commun

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Abbravation: Wireless Personal Communications

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Springer US

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DOI

10.1007/s11277-014-1668-4

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1572-834X

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Novel Advanced Broadcast Scheme for Efficient Safe

Authors: ChienTung Lu ChihLun Chang IHsien Liu JungShian Li
Publish Date: 2014/03/05
Volume: 77, Issue: 4, Pages: 2793-2816
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Abstract

Safety message broadcasting may cause a broadcast storm in vehicular adhoc network without an effective feedback mechanism In particular with increasing number of vehicles serious collisions and incurred long delays are not acceptable for emergency safety messages In this paper we proposed an advanced broadcast scheme by the functionality of distributed coordination function and multichannel operation in dedicated short range communication to decrease collision probability and increase received ratio of safety messages The proposed scheme can increases safety message transmission efficiency and reduce the latency by delicately designing a rebroadcast probability choosing the channel and selecting the backoff timer After broadcasting in the control channel transmitters return to their original service channel Then the vehicles receiving the safety message should inform the others in the same service channel to switch to the control channel for the safety message Afterwards the vehicles broadcast the safety message once and go back to the original service channel This method can inform the other vehicles in different channels to increase the broadcast penetration The proposed scheme can work without global positioning system GPS However GPS can adapt the rebroadcast probability on hot spots to enhance the efficiency of the proposed scheme Through detailed simulations the proposed scheme is shown to be more efficient compared to the existing ones

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