传感网中时延受限的移动式数据收集方法综述
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摘要
数据收集是无线传感器网络中研究的热点问题之一,然而在传统的无线传感器网络中,基站附近的节点由于承担了大量数据转发任务而导致自身能量过早耗尽,缩短了网络的生命期.不少研究通过引入能量较为充足的移动性节点来收集数据,以节省普通传感器节点的能量,但是却导致了数据收集时延过大,如何在保证数据收集时延的前提下最大化网络生命期已成为近几年研究的热点问题.对目前主要的时延受限的移动式数据收集方法进行了充分调研,通过对这些方法的详细分类和比较,归纳了时延受限的移动式数据收集的各类方法的特点,分析了这些方法的优缺点和适用范围,总结了存在的主要问题,并指出了未来的研究方向.
Data collection is one of the hot topics in wireless sensor networks.In traditional wireless sensor networks,those sensor nodes near the sink will deplete their energy prematurely for forwarding data sensed by both themselves and other nodes,which becomes the energy bottleneck and shortens the lifetime of whole networks.To save the energy of sensors in the wireless sensor networks,mobility elements are introduced to collect data in a lot of research work since their energy can be replenished because of mobility.However,the velocity of the mobile elements is slow,which may lead to long data collection delay.To address this problem,the problem of how to maximize the network lifetime while guaranteeing the data collection delay being less than a certain value has become a hot topic.In this paper,we investigate this kind of delay-constrained data collection methods with mobile elements in detail.We first sum up the characteristics of the delay-constrained mobile data collection methods via a novel classification.These methods are compared with each other according to a serial of key parameters.Moreover,we analyze the advantages,disadvantages and the application scope of these methods,summarize the main problems to be addressed,and further point out the future outlook on the research and application directions.
Data collection is one of the hot topics in wireless sensor networks.In traditional wireless sensor networks,those sensor nodes near the sink will deplete their energy prematurely for forwarding data sensed by both themselves and other nodes,which becomes the energy bottleneck and shortens the lifetime of whole networks.To save the energy of sensors in the wireless sensor networks,mobility elements are introduced to collect data in a lot of research work since their energy can be replenished because of mobility.However,the velocity of the mobile elements is slow,which may lead to long data collection delay.To address this problem,the problem of how to maximize the network lifetime while guaranteeing the data collection delay being less than a certain value has become a hot topic.In this paper,we investigate this kind of delay-constrained data collection methods with mobile elements in detail.We first sum up the characteristics of the delay-constrained mobile data collection methods via a novel classification.These methods are compared with each other according to a serial of key parameters.Moreover,we analyze the advantages,disadvantages and the application scope of these methods,summarize the main problems to be addressed,and further point out the future outlook on the research and application directions.
引文
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