After enhancing the communication performance at the MAC layer, in this chapter, we investigate the vehicular link layer performance, which is of paramount importance for reliable message exchanging. However, with limited literature available, there is a lack of understanding about how IEEE 802.11p based DSRC performs for V2V communications in urban environments. In this chapter, we conduct intensive data analytics on V2V communication performance, based on the field measurement data collected from off-the-shelf IEEE 802.11p-compatible onboard units (OBUs) in Shanghai city, and obtain several key insights as follows. First, among many context factors, non-line-of-sight (NLoS) link condition is the major factor degrading V2V performance. Second, both line-of-sight (LoS) and NLoS durations follow power law distributions, which implies that the probability of having long LoS/NLoS conditions can be relatively high. Third, the packet inter-reception (PIR) time distribution follows an exponential distribution in LoS conditions but a power law in NLoS conditions. In contrast, the packet inter-loss (PIL) time distribution in LoS condition follows a power law but an exponential in NLoS condition. Fourth, the overall PIR time distribution is a mix of exponential distribution and power law distribution. The presented results can provide solid ground to validate models, tune VANET simulators, and improve communication strategies.
Characterizing Urban V2V Link Communications
Wireless Networks
2020-08-07
23 pages
Article/Chapter (Book)
Electronic Resource
English
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