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access icon free Adaptive multichannel MAC protocol based on SD-TDMA mechanism for the vehicular ad hoc network

© The Institution of Engineering and Technology
Received 17/09/2017, Accepted 30/03/2018, Revised 23/03/2018, Published 13/04/2018

In this study, the design of an adaptive medium access control (MAC) protocol based on the space-division–time-division multiple access (SD-TDMA) mechanism is presented to improve the utilisation and fairness of the time-slot allocation scheme in the vehicular ad hoc network. The SD-TDMA mechanism dynamically allocates time-slots owing to a dynamic topology. This protocol reduces transmission collisions through user detection procedures. Most users can thus access the service channel (SCH) without conflict and acquire time slots according to the mapping between geographic locations and time slots. Users failing to access the channel in user detection procedures can send request access packets in security channels to again participate in SCH time-slot allocation during the SCH interval. Simulations are conducted to evaluate the performance of the proposed method in urban scenarios. The SD-TDMA mechanism is compared with an SDMA-based MAC protocol, the IEEE 802.11p distributed coordination function and an MAC protocol based on transmission sequences. Owing to the decreased rate of transmission collisions and the dynamic time-slot allocation scheme, it is shown that the SD-TDMA mechanism provides a significantly higher utilisation of time slots and better fairness of data transmission than existing approaches.

Inspec keywords: vehicular ad hoc networks; space division multiple access; wireless LAN; telecommunication traffic; time division multiple access

Other keywords: SDMA-based MAC protocol; adaptive medium access control protocol; user detection procedures; geographic locations; space-division–time-division multiple access mechanism; transmission collisions; service channel; adaptive multichannel MAC protocol; request access packets; SD-TDMA mechanism; dynamic time-slot allocation scheme; SCH time-slot allocation; vehicular ad hoc network; transmission sequences

Subjects: Protocols; Mobile radio systems; Multiple access communication

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