Simulation Based Evaluation of Highway Road Scenario between DSRC/802.11p MAC Protocol and STDMA for Vehicle-to-Vehicle Communication

Abstract

<p class="MsoNormal" style="text-align:justify;"> <span lang="EN-US">In this paper the DSRC/IEEE 802.11p Medium Access Control (MAC) method of the vehicular communication has been simulated on highway road scenario with periodic broadcast of packets in a vehicle-to-vehicle situation. IEEE 802.11p MAC method is basically based on carrier sense multiple accesses (CSMA) where nodes listen to the wireless channel before sending the packets. If the channel is busy, the vehicle node must defer its access and during high utilization periods this could lead to unbounded delays. This well-known property of CSMA is undesirable for critical communications scenarios. The simulation results reveal that a specific vehicle is forced to drop over 80% of its packets/messages because no channel access was possible before the next message/packet was generated. To overcome this problem, we propose to use self-organizing time division multiple access (STDMA) for real-time data traffic between vehicles. Our initial results indicate that STDMA outperforms CSMA for time-critical traffic safety applications in <i>ad- hoc </i>vehicular networks.</span><span lang="EN-US"><o:p></o:p></span> </p

Understanding STDMA via computer simulation: feasibility to vehicular safety applications, configurations, and time synchronization errors

“…Even if the physical layer of vehicular communications (i.e., IEEE 802.11p) supports multiple physical transmission rates, only the single rate (e.g., 3 Mbps) has been employed in previous simulation studies [4,5,[9][10][11][12][13][14]. However, we expect that PDRs of STDMA could be affected by the transmission rate and proper selection could improve the PDRs.…”

“…In [10], the authors analyzed the real-time properties of CSMA/CA and STDMA via simulation studies in highway scenarios and revealed that STDMA was better than CSMA/CA. The authors in [11] pointed out that CSMA/CA was not suitable to vehicular safety applications and showed that STDMA outperformed CSMA/CA. In [12], the authors focused on the hidden terminal problem when using CSMA and STDMA for vehicular communications.…”

“…Then, they have proposed to exploit both DSRC band and TVWS band. There have been previous simulation studies when STDMA is used for vehicular networks [9][10][11][12][13][14]. In [9], the authors focused on throughput of STDMA via simulation studies.…”

“…Even if there have been previous simulation studies when STDMA was used for vehicular networks [9][10][11][12][13][14], they have mainly focused on comparing network performances of CSMA/CA with those of STDMA and have concluded that STDMA was more suitable to vehicular networks than CSMA/CA. But, these studies could not confirm the feasibility of STDMA to vehicular safety applications because they have several missing points-(1) no consideration of time synchronization error and (2) evaluation with a single set of configurations.…”

“…To address the challenges of EDCA and TDMA, several researchers have proposed to adopt Self-organized TDMA (STDMA) as an alternative MAC for vehicular communications [9][10][11]. STDMA has both deterministic and distributed natures.…”