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一种异步自适应无线传感器网络MAC协议 总被引:1,自引:0,他引:1
针对无线传感器网络低能耗、低延时的特点,提出一种异步自适应MAC协议:AA-MAC.该协议缩短了无线传感器网络MAC协议中异步唤醒方式的前导帧长度,同时采用自适应监听来减少数据发送延时.通过在NS2上的仿真模拟比较,发现AA-MAC相对于同类型的MAC协议有更好的节能效果和更短的延时,因此AA-MAC能更适合无线传感器网络的要求. 相似文献
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一种无线传感器网络MAC协议优化算法 总被引:11,自引:0,他引:11
在无线传感器网络中,各节点采集的信息以多跳的方式传送到汇聚点.从各节点到汇聚点形成一棵以汇聚点为根的传输树.文中在对无线传感器网络传输特点分析的基础上,剖析了基于CSMA/CA(载波多路监听/冲突避免)的MAC协议在树状结构无线传感器网络中的弊端,提出了一种基于CSMA/CA的MAC协议优化算法.算法基于节点在传输树中的位置信息调整其MAC信道接入分配,将CSMA/CA采用的各节点均等竞争信道的方法优化为各节点依据在传输树中的位置情况竞争信道的方式,这一优化提高了节点公平性,使MAC信道接入分配与树状结构的无线传感器网络传输特点相契合,解决了基于CSMA/CA的MAC协议与树状结构无线传感器网络不匹配的问题,从而减少了信道资源浪费,提高了网络传输效率,降低了能耗.实验结果表明该算法在网络丢包率、吞吐量和能耗方面的性能均有较大改进. 相似文献
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MAC协议是无线传感器网络协议的重要组成部分,网络的性能(如吞吐量、容量、时延及功耗等)依赖于所采用的MAC协议,也是无线传感器网络设计研究的主要技术难点之一。该文指出了无线传感器网络MAC协议设计的主要问题.对几种典型的MAC协议进行了分析和研究,并分析研究了无线传感器网络MAC协议的研究与应用方向。 相似文献
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MAC协议是无线传感器网络协议的重要组成部分,网络的性能(如吞吐量、容量、时延及功耗等)依赖于所采用的MAC协议,也是无线传感器网络设计研究的主要技术难点之一。该文指出了无线传感器网络MAC协议设计的主要问题,对几种典型的MAC协议进行了分析和研究,并分析研究了无线传感器网络MAC协议的研究与应用方向。 相似文献
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E. Egea-López J. Vales-Alonso A. S. Martínez-Sala J. García-Haro P. Pavón-Mariño M. V. Bueno Delgado 《Personal and Ubiquitous Computing》2008,12(2):111-122
Wireless sensor networks (WSN) are designed for data gathering and processing, with particular requirements: low hardware
complexity, low energy consumption, special traffic pattern support, scalability, and in some cases, real-time operation.
In this paper we present the virtual TDMA for sensors (VTS) MAC protocol, which intends to support the previous features,
focusing particularly on real-time operation. VTS adaptively creates a TDMA arrangement with a number of timeslots equal to
the actual number of nodes in range. Thus, VTS achieves an optimal throughput performance compared to TDMA protocols with
fixed size of frame. The frame is set up and maintained by a distributed procedure, which allows sensors to asynchronously
join and leave the frame. In addition, duty cycle is increased or decreased in order to keep latency constant below a given
deadline. Therefore, a major advantage of VTS is that it guarantees a bounded latency, which allows soft real-time applications.
相似文献
M. V. Bueno DelgadoEmail: |
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The MAC protocol for wireless sensor network plays a very important role in the control of energy consumption. It is a very important issue to effectively utilize power under the condition of limited energy. The most energy-wasting part of the MAC protocol for wireless sensor network is at the idling condition. Therefore it is crucial for power saving to be able to turn off the signal transducer of the wireless network when the equipment is idling. Pattern-MAC (PMAC) allows sensors that did not transfer for a long period of time to quickly enter a dormant state, so that the problem of sensor overhearing can be greatly improved, and the whole network structure can fully respond to the actual transfer rate without too much energy consumption, but this type of design requires precise time synchronization mechanism. Achieving time synchronization is a very energy consuming and very expensive mechanism in the sensor network structure, achieving the goal is coupled with excess energy consumption and reduction of the lifespan of the sensor. Additionally, the exchange action with the neighboring pattern after each cycle, not only generates additional energy consumption for data transfer, but is also accompanied by factors such as competition, collision and pattern exchange failure. We propose an asynchronous MAC protocol (AMAC) in this paper and expect to improve the problem of energy wasting and time synchronization due to sleeping schedule exchange under the PMAC basic protocol. 相似文献
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We propose an adaptive and energy-efficient TDMA-based MAC protocol that significantly reduces energy consumption in the network, while efficiently handling network traffic load variations and optimizing channel utilization through a timeslot stealing mechanism and a timeslot reassignment procedure. We have analytically derived the average delay performance of our MAC protocol, with and without the timeslot stealing mechanism. Our delay model, validated via simulations, shows that the timeslot stealing mechanism can substantially improve the protocol throughput in scenarios with varying and asymmetric traffic patterns. Evaluation results show that the timeslot reassignment procedure is efficient in handling the longer timescale changes in the traffic load, while the timeslot stealing mechanism is better in handling the shorter timescale changes in the traffic patterns. 相似文献
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提出了一种基于预约调度的用于无线传感器网络的MAC协议--SSMAC.该协议采用分布式竞争接入和预约调度发送,提供高能量效率的信道接入和支持QoS业务的传输,较好地解决了隐藏终端和暴露终端问题.仿真结果表明SSMAC协议在保持节能的同时,在降低媒体接入时延、提高报文投递成功率和提供QoS保障上较TRAMA协议性能有很大的提高. 相似文献
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在大规模无线传感器网络中传输的监测数据具有较大的空间相关性,数据的传输存在一定冗余.如何有效的减少冗余数据的传输来改善网络性能成为一个重要的研究课题.本文以环状空间相关性模型为基础,从节点的筛选策略研究入手,提出一种能量高效的无线传感器网络MAC协议SEMAC.SEMAC协议采用信号强度优先的节点选择算法和冲突避免机制... 相似文献