电子与信息学报
電子與信息學報
전자여신식학보
JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY
2015年
2期
443-448
,共6页
间断连接无线网络%缓存管理%消息效用值%节点服务能力
間斷連接無線網絡%緩存管理%消息效用值%節點服務能力
간단련접무선망락%완존관리%소식효용치%절점복무능력
Intermittently connected wireless network%Cache management%Message utility%Nodeservice ability
针对间断连接无线网络中的节点缓存资源有限的问题,该文提出一种适用于间断连接无线网络的缓存管理机制。根据运动过程中所获得的网络状态信息,各个节点以分布式的方式估计给定节点与其他节点直接及间接连接状态、节点服务率以及节点连通强度,动态感知各个节点服务能力的差异,同时预测当前节点成功投递该消息的概率以感知消息的效用值,从而执行缓存管理操作。结果表明,与其他缓存管理机制相比,所提出的缓存管理机制不仅能够有效降低投递开销,同时大幅度地提高了消息成功投递率。
針對間斷連接無線網絡中的節點緩存資源有限的問題,該文提齣一種適用于間斷連接無線網絡的緩存管理機製。根據運動過程中所穫得的網絡狀態信息,各箇節點以分佈式的方式估計給定節點與其他節點直接及間接連接狀態、節點服務率以及節點連通彊度,動態感知各箇節點服務能力的差異,同時預測噹前節點成功投遞該消息的概率以感知消息的效用值,從而執行緩存管理操作。結果錶明,與其他緩存管理機製相比,所提齣的緩存管理機製不僅能夠有效降低投遞開銷,同時大幅度地提高瞭消息成功投遞率。
침대간단련접무선망락중적절점완존자원유한적문제,해문제출일충괄용우간단련접무선망락적완존관리궤제。근거운동과정중소획득적망락상태신식,각개절점이분포식적방식고계급정절점여기타절점직접급간접련접상태、절점복무솔이급절점련통강도,동태감지각개절점복무능력적차이,동시예측당전절점성공투체해소식적개솔이감지소식적효용치,종이집행완존관리조작。결과표명,여기타완존관리궤제상비,소제출적완존관리궤제불부능구유효강저투체개소,동시대폭도지제고료소식성공투체솔。
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.