In this chapter, we propose a CIDC scheme for safety message broadcast. By exploiting the high-frequency and periodical features of the safety message broadcast, the application-layer design of the CIDC enables each vehicle to estimate the instantaneous channel contention intensity in a fully distributed manner. With the contention intensity information, the MAC layer design of CIDC allows vehicles to adapt their channel access strategy. This is because CIDC selects the initial back-off counter for each new packet deterministically, i.e., based on the contention intensity, instead of randomly. The proposed CIDC is modeled, and key performance indicators in terms of the packet collision probability and average contention delay are derived. It is shown that the proposed change in the initial counter selection leads to a system model completely different from the classic Markov chain based model. Moreover, the proposed CIDC is fully distributed and can achieve both a much lower collision probability and a smaller contention delay compared with 802.11p at the cost of a small communication and computation overhead. Extensive simulation results demonstrate the effectiveness of the CIDC in the cases of both accurate and erroneous contention intensity estimation.
Protocol Design for Safety Message Broadcast
SpringerBriefs Computer Sci.
Intelligent Computing and Communication for the Internet of Vehicles ; Kapitel : 3 ; 17-48
15.11.2022
32 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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