一種基于可靠最遠(yuǎn)轉(zhuǎn)發(fā)的車載網(wǎng)廣播協(xié)議
doi: 10.11999/JEIT150763
基金項(xiàng)目:
國(guó)家自然科學(xué)青年基金(61403397)，中國(guó)博士后科學(xué)基金(2013M542527)，陜西省自然科學(xué)基金(2014JQ8310)
A Reliable Most Forward within Radius Scheme Based Broadcast Protocol for Vehicular Ad-hoc Networks
Funds:
The National Natural Science Foundation of China (61403397), The China Postdoctoral Science Foundation (2013M542527), The Natural Science Foundation of Shaanxi Province (2014JQ8310)
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摘要: 許多車載自組網(wǎng)應(yīng)用依賴于可靠高效的廣播，但車載自組網(wǎng)節(jié)點(diǎn)高速移動(dòng)，網(wǎng)絡(luò)連通性隨場(chǎng)景和時(shí)間動(dòng)態(tài)變化的特性給廣播協(xié)議的設(shè)計(jì)帶來(lái)巨大挑戰(zhàn)。為了應(yīng)對(duì)這種挑戰(zhàn)，該文在分析和驗(yàn)證簡(jiǎn)單最遠(yuǎn)轉(zhuǎn)發(fā)機(jī)制具有低可靠性的同時(shí)，提出一種基于廣播方向的可靠最遠(yuǎn)轉(zhuǎn)發(fā)策略，并結(jié)合捎帶確認(rèn)機(jī)制設(shè)計(jì)了一種新的自組網(wǎng)多跳廣播協(xié)議。與簡(jiǎn)單最遠(yuǎn)轉(zhuǎn)發(fā)相比，可靠最遠(yuǎn)轉(zhuǎn)發(fā)能明顯降低轉(zhuǎn)發(fā)節(jié)點(diǎn)失效的概率，提高消息單跳傳播的可靠性；捎帶確認(rèn)機(jī)制使得協(xié)議能夠適應(yīng)網(wǎng)絡(luò)連通性較差的場(chǎng)景，提升了消息全網(wǎng)傳播的可靠性。仿真結(jié)果表明，提出的協(xié)議能在各種場(chǎng)景中實(shí)現(xiàn)高可靠性、低冗余的廣播。
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關(guān)鍵詞:
- 車載自組網(wǎng) /
- 廣播 /
- 最遠(yuǎn)轉(zhuǎn)發(fā) /
- 捎帶確認(rèn) /
- 可靠性
Abstract: Many applications in Vehicular Ad-hoc NETworks (VANETs) rely on reliable and efficient broadcast, however, the characters that nodes move quickly and connectivity changes with scenario and time will pose a huge challenge to broadcast protocol designing of VANETs. To cope with the challenge, a broadcast direction based reliable most forward within radius scheme is proposed on the basis of analyzing and verifying that simple most forward within radius scheme has poor reliability. Then, combined with piggybacked acknowledgement mechanism, a new multi-hop broadcast protocol is designed. Compared with simple most forward within radius, reliable most forward within radius can significantly reduce failure rate of relay nodes and improve the single-hop propagation reliability; piggybacked acknowledgement enables the protocol to adapt to poor connectivity scenarios and enhances the reliability of messages spreading though the whole network. The simulation results show that the proposed protocol can achieve high reliability and low redundancy broadcasts. -
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