Reliable Transmission Mechanism for safety-critical information in vehicular wireless networks

Abstract

Vehicular wireless networks have emerged as a promising wireless communication technology in recent years. Vehicular wireless networks collect information on real-time traffic, such as the road situation, the location of a car accident, etc., which must be delivered to its destination before a set deadline in order to be useful for an Intelligent Transportation System (ITS). Target applications are called safety-critical information. However, vehicular wireless communication does not incorporate reliable transmission of safety-critical information which will experience wireless errors due to collisions or the noisy environment caused by the high speed of moving vehicles. If the driver of a vehicle does not receive the information in time, this may cause a critical condition. This paper proposes a Reliable Transmission Mechanism (RTM) to solve this problem. The RTM relies on extra parity bytes adaptively added to a byte-level forward error correction mechanism to enhance the transmission quality of safety-critical information. This paper simulates the RTM and compares it with conventional vehicular wireless networks in terms of effective packet loss rate, retransmission count and average end-to-end delay. The simulation results show that our proposed RTM protects the information effectively.

Cooperative Error Control Mechanism Combining Cognitive Technology for Video Streaming Over Vehicular Networks

“…The effective packet loss rate of CEC mechanism combining CT has a lower bound less than 0.005 conditions. We use metrics which are the EPLR, DFR and PSNR to compare the CEC mechanism combining CT with RTM (Chilamkurti, Tsai, Ke, Park, & Kang, 2010) and CARQ (Morillo-Pozo, Trullols, Barcelo, & Garcia-Vidal, 2008) in performance against packet loss. The EPLR of the CEC mechanism combining CT and CARQ mechanisms for different packet loss rates are shown in Figure 11.…”

“…The quality of video streaming will decrease with packet loss which errors will propagate in the dependency frames. Chilamkurti, Tsai, Ke, Park, and Kang (2010) proposed a Reliable Transmission Mechanism (RTM) which proposed the roadside unit relies on extra parity bytes adaptively added to a byte-level Forward Error Correction (FEC) to enhance the transmission quality. However, vehicular networks are characterized by intermittent connectivity to the roadside unit.…”