共查询到18条相似文献,搜索用时 862 毫秒
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伴随信息化网络时代的来临,无线传感器网络作为一种新兴技术近年来得到了社会各界广泛的关注与应用。无线传感器网络实现的多信道通信技术具有实时监测、感知并将信息传输到相应的管理平台中的功能。本文主要分析了无线传感器网络的结构,无线传感器网络的通信协议与MAC协议,并从多信道频谱感知、多信道MAC协议和多信道广播对无线传感器网络的通行技术进行了深入研究。 相似文献
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随着我国科学技术水平的不断提升,无线传感器网络多信道通信技术也在进一步深入,本文主要阐述了无线传感器网络多信道通信技术的应用。并通过对无线传感器的结构与特点进行分析,根据对多信道MAC协议在无线传感器网络中的问题进行了探究,且提出了相应的解决方式。希望能够推动无线传感器网络技术的迅速发展。 相似文献
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无线MESH网络中的多信道MAC协议概述 总被引:1,自引:0,他引:1
分析了无线mesh网络多信道应用的必要性;介绍了多信道应用的现状,列出了几种典型的多信道协议;对各种多信道协议进行了分析,总结了其优缺点;提出对多信道未来改进方向的看法. 相似文献
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在无线Mesh网络中使用多信道可以减少碰撞和干扰,提高系统吞吐量。本文先介绍无线Mesh网络,然后介绍多信道在无线Mesh网络中的应用,分析了几种常用的多信道MAC协议。接着着重阐述了多信道无线Mesh网络所面临的问题与挑战,对信道分配、路由选择和隐蔽终端这3个主要问题进行分析,并对其研究设计方向进行了展望。 相似文献
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在无线Mesh网络中使用多信道可以减少碰撞和干扰,提高系统吞吐量.本文先介绍无线Mesh网络,然后介绍多信道在无线Mesh网络中的应用,分析了几种常用的多信道MAC协议.接着着重阐述了多信道无线Mesh网络所面临的问题与挑战,对信道分配、路由选择和隐蔽终端这3个主要问题进行分析,并对其研究设计方向进行了展望. 相似文献
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ATM技术以其统计复用的最大特点正在被广泛采用。ATM网络中多信道传输技术是网络资源有效利用的方法之一。本文说明了多信道传输技术的基本原理,并介绍了关于ATM网络中多信道传输技术的一个协议-ATM反向复用协议。 相似文献
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本文首先介绍Adhoc网络的概貌,然后分析Adhoc网络的体系结构。在介绍了信道接入协议的地位和作用后,对Adhoc网络特有的信道共享方式、隐终端和暴露终端问题进行了介绍和分析。文章把Adhoc网络的信道接入协议划分成基于单信道、双信道和多信道三类,最后给出了Adhoc网络信道接入协议的发展动向。 相似文献
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中首先简要说明信道接入技术在无线网络中的地位和作用;然后对当前无线网络中使用较流行的一些信道接入协议进行有针对性的分类;最后,鉴于日益发展的数据业务,主要对随机信道接入协议进行详细的阐述,将其分为随机接入算法和冲突解决算法两部分,并介绍了它们各自当前的一些主流技术。在冲突解决算法中主要从基于协议的算法以及基于信号处理的技术这两个方向进行分析比较。后体现了信号处理技术和网络技术相互融合的趋势。 相似文献
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通信技术发展日益加快,网络通信中越来越多的运用多信道通信技术,多信道通信技术不但是解决因为信道干扰导致的网络瘫痪问题的良药,还能把网络通信的吞吐量进行进一步的提高,使得网络通信的可靠性得到保证。但在这样的情况下,也有新的问题出现,例如网络安全问题、单信道广播问题等等。基于以上情况,笔者对多信道MAC协议、多信道频谱感知、多信道广播进行相应的研究和分析。 相似文献
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A Detailed Review of Multi-Channel Medium Access Control Protocols for Wireless Sensor Networks 总被引:1,自引:0,他引:1
GholamHossein EkbataniFard Reza Monsefi 《International Journal of Wireless Information Networks》2012,19(1):1-21
Most applications of Wireless Sensor Networks (WSNs) assume the presence of single-channel Medium Access Control (MAC) protocols.
In the usual dense deployment of the sensor networks, single-channel MAC protocols may be deficient because of radio collisions
and limited bandwidth. Hence, using multiple channels can significantly improve the performance of WSN. Recent developments
in sensor technology, as seen in Crossbow’s MICAz Mote, Rockwell’s WINS nodes and IEEE 802.15.4 Zigbee, have enabled support
for multi-channel communications. Several multi-channel MAC protocols with different objectives have been proposed for WSNs
in literature. This paper surveys and classifies the state-of-the-art multi-channel MAC protocols that are proposed for WSNs.
It first outlines the sensor network properties that are crucial for designing a MAC protocol. It subsequently reviews the
existent challenges to design a good multi-channel MAC protocol for the sensor networks. Then, several multi-channel MAC protocols
specifically proposed for the WSNs are inspected in detail and compared with each other. Finally, some open issues in this
area are outlined for future research. 相似文献
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In a regular wireless ad hoc network, the Medium Access Control (MAC) protocol coordinates channel access among nodes, and the throughput of the network is limited by the bandwidth of a single channel. The multi-channel MAC protocols can exploit multiple channels to achieve high network throughput by enabling more concurrent transmissions. In this paper, we propose a hybrid and adaptive protocol, called H-MMAC, which utilizes multi-channel resources more efficiently than other multi-channel MAC protocols. The main idea is to adopt the IEEE 802.11 Power Saving Mechanism and to allow nodes to transmit data packets while other nodes try to negotiate the data channel during the Ad hoc Traffic Indication Message window based on the network traffic load. The analytical and simulation results show that the proposed H-MMAC protocol improves the network performance significantly in terms of the aggregate throughput, average delay, fairness and energy efficiency. 相似文献
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Existing multi-channel Medium Access Control (MAC) protocols have been demonstrated to significantly increase wireless network performance compared to single channel MAC protocols. Traditionally, the channelization structure in IEEE 802.11 based wireless networks is pre-configured, and the entire available spectrum is divided into subchannels and equal channel widths. In contrast, this paper presents a Traffic-Aware Channelization MAC (TAC-MAC) protocol for wireless ad hoc networks, where each node is equipped with a single half duplex transceiver. TAC-MAC works in a distributed, fine-grai-ned manner, which dynamically divides variable-width subchannels and allocates subchannel width based on the Orthogonal Frequency Division Multiplexing (OFDM) technique according to the traffic demands of nodes. Simulations show that the TAC-MAC can significantly improve network throughput and reduce packet delay compared with both fixed-width multi-channel MAC and single channel 802.11 protocols, which illustrates a new paradigm for high-efficient multi-channel MAC design in wireless ad hoc networks. 相似文献
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Currently most wireless sensor network applications assume the presence of single-channel medium access control (MAC) protocols. However, lower sensing range result in dense networks, single-channel MAC protocols may be inadequate due to higher demand for the limited bandwidth. In this paper we proposed a method of multi-channel support for DMAC in Wireless sensor networks (WSNs). The channel assignment method is based on local information of nodes. Our multi-channel DMAC protocol implement channel distribution before message collecting from source nodes to sink node and made broadcasting possible in DMAC. Analysis and simulation result displays this multi-channel protocol obviously decreases the latency without increasing energy consumption. 相似文献
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MinSheng 《电子科学学刊(英文版)》2003,20(5):344-352
In this paper, the capacity of multi-channel, multi-hop ad hoc network is evaluated.In particular, the performance of multi-hop ad hoc network with single channel IEEE 802.11 MAC utilizing different topologies is shown. Also the scaling laws of throughputs for largescale ad hoc networks and the theoretical guaranteed throughput bounds for multi-channel grid topology systems are proposed. The results presented in this work will help researchers to choose the proper parameter settings in evaluation of protocols for multi-hop ad hoc networks. 相似文献
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Traditional single-channel MAC protocols for wireless ad hoc and sensor networks favor energy-efficiency over throughput. More recent multi-channel MAC protocols display higher throughput but less energy efficiency. In this article we propose NAMAC, a negotiator-based multi-channel MAC protocol in which specially designated nodes called negotiators maintain the sleeping and communication schedules of nodes within their communication ranges in static wireless ad hoc and sensor networks. Negotiators facilitate the assignation of channels and coordination of communications windows, thus allowing individual nodes to sleep and save energy. We formally define the problem of finding the optimal set of negotiators (i.e., minimizing the number of selected negotiators while maximizing the coverage of the negotiators) and prove that the problem is NP-Complete. Accordingly, we propose a greedy negotiator-election algorithm as part of NAMAC. In addition, we prove the correctness of NAMAC through a rigorous model checking and analyze various characteristics of NAMAC—the throughput of NAMAC, impact of negotiators on network capacity, and storage and computational overhead. Simulation results show that NAMAC, at high network loads, consumes 36 % less energy while providing 25 % more throughput than comparable state-of-art multi-channel MAC protocols for ad hoc networks. Additionally, we propose a lightweight version of NAMAC and show that it outperforms (55 % higher throughput with 36 % less energy) state-of-art MAC protocols for wireless sensor networks. 相似文献