Abstract
In vehicular ad hoc networks (VANETs), safety applications require a reliable and delay-guaranteed broadcasting service to disseminate safety messages. However, channel fading and the high mobility of vehicles make it very challenging for a broadcasting scheme to meet the strict service demands of safety messages. On the other hand, cooperative retransmission is effective in mitigating wireless channel impairments by utilizing the broadcast nature of wireless channels. Therefore, this paper proposes a repetition-based cooperative broadcasting (RBCB) scheme for safety messages in VANETs. The proposed scheme enables the selected helper vehicles to perform the cooperative rebroadcasting along with the source vehicle during the source vehicle’s slot in order to increase the transmission reliability of safety messages and reduce rebroadcasting times. The performance of RBCB scheme is mathematically analyzed in terms of packet delivery probability and average packet delay under the Rayleigh fading channel. Moreover, extensive simulations are conducted to evaluate the performance of RBCB scheme. Both mathematical analysis and simulation results demonstrate that RBCB scheme significantly improves the packet delivery probability and decreases the average packet delay.
Highlights
The rapid growth in the number of vehicles has caused some serious problems in urban roads and highways, such as traffic congestions and road crashes
The average packet delay is defined as the average number of slots between a packet’s generation and the time when it is cleared from the buffer of the source node
We propose a repetition-based cooperative broadcasting scheme for safety
Summary
The rapid growth in the number of vehicles has caused some serious problems in urban roads and highways, such as traffic congestions and road crashes. In order to provide a delay-guaranteed broadcasting service for safety messages, several distributed time division multiple access (TDMA)-based schemes such as ADHOC MAC [7] and VeMAC [8] have been proposed in the literature. Repetition-based techniques have been proposed to meet such requirements as timeliness and reliability for broadcasting [9,10] These schemes allow the source vehicle to repeatedly transmit a message during the lifetime of the safety message so that its neighbors can have more opportunities to receive the message. We propose a repetition-based cooperative broadcasting (RBCB) scheme for VANETs in order to improve the transmission reliability of safety messages and reduce the number of rebroadcasting.
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