帶有節(jié)點(diǎn)狀態(tài)估計(jì)的間斷連接無(wú)線網(wǎng)絡(luò)緩存管理策略
doi: 10.11999/JEIT140333
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61371097)，重慶市自然科學(xué)重點(diǎn)基金(CSTC2013JJB40001, CSTC2013JJB40006)，重慶市青年科技人才培養(yǎng)計(jì)劃(CSTC2014KJRC-QNRC40001)和重郵青年自然科學(xué)基金(A2012-93)資助課題
Cache Management Mechanism with Node Status Evaluation for Intermittently Connected Wireless Networks
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摘要: 針對(duì)間斷連接無(wú)線網(wǎng)絡(luò)中的節(jié)點(diǎn)緩存資源有限的問(wèn)題，該文提出一種適用于間斷連接無(wú)線網(wǎng)絡(luò)的緩存管理機(jī)制。根據(jù)運(yùn)動(dòng)過(guò)程中所獲得的網(wǎng)絡(luò)狀態(tài)信息，各個(gè)節(jié)點(diǎn)以分布式的方式估計(jì)給定節(jié)點(diǎn)與其他節(jié)點(diǎn)直接及間接連接狀態(tài)、節(jié)點(diǎn)服務(wù)率以及節(jié)點(diǎn)連通強(qiáng)度，動(dòng)態(tài)感知各個(gè)節(jié)點(diǎn)服務(wù)能力的差異，同時(shí)預(yù)測(cè)當(dāng)前節(jié)點(diǎn)成功投遞該消息的概率以感知消息的效用值，從而執(zhí)行緩存管理操作。結(jié)果表明，與其他緩存管理機(jī)制相比，所提出的緩存管理機(jī)制不僅能夠有效降低投遞開(kāi)銷，同時(shí)大幅度地提高了消息成功投遞率。
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關(guān)鍵詞:
- 間斷連接無(wú)線網(wǎng)絡(luò) /
- 緩存管理 /
- 消息效用值 /
- 節(jié)點(diǎn)服務(wù)能力
Abstract: Considering the limited cache resources of nodes in intermittently connected wireless networks, a cache management mechanism is proposed based on node state estimate. The direct and indirect connection status, service rate and connectivity degree between the given nodes can be evaluated in a distributed manner, according to the network state monitored during the movement. Further, the difference of service ability of each node can be determined dynamically. Furthermore, the probability of message successfully delivered by the current node and the utility for the given message can be estimated. Consequently, cache management operations are executed reasonably. Simulation results show that the proposed mechanism does not only constrain the overhead ratio effectively but also enhance the message delivery ratio, compared with other mechanisms. -
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