Abstract
Cooperative downloading is one of the effective methods to improve the amount of downloaded data in vehicular ad hoc networking (VANET). However, the poor channel quality and short encounter time bring about a high packet loss rate, which decreases transmission efficiency and fails to satisfy the requirement of high quality of service (QoS) for some applications. Digital fountain code (DFC) can be utilized in the field of wireless communication to increase transmission efficiency. For cooperative forwarding, however, processing delay from frequent coding and decoding as well as single feedback mechanism using DFC cannot adapt to the environment of VANET. In this paper, a cooperative downloading method for VANET using concatenated DFC is proposed to solve the problems above. The source vehicle and cooperative vehicles encodes the raw data using hierarchical fountain code before they send to the client directly or indirectly. Although some packets may be lost, the client can recover the raw data, so long as it receives enough encoded packets. The method avoids data retransmission due to packet loss. Furthermore, the concatenated feedback mechanism in the method reduces the transmission delay effectively. Simulation results indicate the benefits of the proposed scheme in terms of increasing amount of downloaded data and data receiving rate.
Highlights
With the development of wireless communication technology, there is an increasing demand to access the Internet for commuters on vehicles
The results indicate that, the packet loss loss rates rates (PLRs) of DDFC is a little higher than those of Digital fountain code (DFC)-LT and DFC-Relay, the client can download more data using DDFC compared with the two methods
We propose the cooperative downloading method for vehicular ad hoc networking (VANET) using DFC to increase the amount of downloaded data and enable the transmission to be more robust in a vehicular environment
Summary
With the development of wireless communication technology, there is an increasing demand to access the Internet for commuters on vehicles. The goal can be achieved using widely available cellular systems. In some places such as highway scenarios, base stations are built with sparse distribution (the two BS are 2.5 km apart in highway scenarios and 400m apart in urban areas), which leads to poor performance. The high cost of a cellular system is another barrier to restrict the development of accessing Internet on vehicles. Wi-Fi is another technology that can be employed by VANET. The disadvantage of Wi-Fi access is the constrained communication area
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