內(nèi)容中心網(wǎng)絡(luò)中基于差異化緩存通告的混合路由機制
doi: 10.11999/JEIT140527 cstr: 32379.14.JEIT140527
基金項目:
國家973計劃項目(2012CB315901, 2013CB329104)，國家自然科學基金(61372121)和國家863計劃項目(2011AA01A103)資助課題
A Hybrid Routing Scheme Based on Differentiated Cache Advertisement in Content Centric Networking
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摘要: 針對內(nèi)容中心網(wǎng)絡(luò)(CCN)節(jié)點暫態(tài)緩存的高效利用問題，將數(shù)據(jù)場的思想引入到CCN轉(zhuǎn)發(fā)決策中，該文提出一種基于差異化緩存通告的混合路由機制。緩存通告時，依據(jù)內(nèi)容活躍等級和緩存駐留概率，執(zhí)行差異化的內(nèi)容通告和勢能輻射；路由查找時，針對持久穩(wěn)定的內(nèi)容源和動態(tài)可變的臨時緩存副本，分別構(gòu)建全局導向和局域吸引勢能輻射場，實現(xiàn)興趣包請求的全局路由和局部就近應(yīng)答。仿真結(jié)果表明，該機制減小了內(nèi)容請求時延，提高了緩存命中率，以少量額外的開銷提升了CCN網(wǎng)絡(luò)整體的內(nèi)容分發(fā)性能。
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關(guān)鍵詞:
- 內(nèi)容中心網(wǎng)絡(luò) /
- 數(shù)據(jù)場 /
- 緩存策略 /
- 內(nèi)容路由
Abstract: How to efficiently utilize the temporary cached replicas poses challenges to the retrieval process of Content Centric Networking (CCN). Inspired by the idea of data fields, a hybrid routing scheme based on differentiated cache advertisement is proposed. In the scheme, depending on the content popularity and resident probability, the differentiated advertisement strategy is performed to choose the advertised content and calculate the attracting potential. When a retrieve is requested, in order to realize global routing and local response to the content request, the globally oriented potential field and locally attracting potential field are constructed for the stable original content source and volatile cached copies, respectively. The simulation results show that the scheme can decrease the request latency, increase the cache hit ratio, while improving the overall performance of content delivery with a small amount of additional overhead.-
Key words:
- Content Centric Networking (CCN) /
- Data field /
- Caching strategy /
- Content-based routing
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