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A utility-based intelligent network selection for 3G and WLAN heterogeneous networks 基于实用的3G和WLAN异构网络智能网络选择
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2077
Yisheng Lai, K. K. Chai, Yue Chen
In establishing of next-generation wireless networks, finding the best connection is a key challenge. An algorithm based on utility theory has been proposed in this paper to evaluate all these wireless networks, in terms of network performances and user behaviours. By applying the utility function, user satisfaction can be mathematically calculated in terms of the criterion received by each user. A single criterion function with sigmoid type has been chosen, by which the user behaviour can be perfectly described. Next, a novel aggregate method has been added, with user preference involved, to calculate the overall utility. The network with highest utility is the best choice for user. Both theoretical analysis and practical simulation have proved the effectiveness of our proposed algorithm. (6 pages)
在建立下一代无线网络时,寻找最佳连接是一个关键挑战。本文提出了一种基于效用理论的算法,从网络性能和用户行为的角度来评估所有这些无线网络。通过应用效用函数,用户满意度可以根据每个用户收到的标准进行数学计算。选择了一个具有sigmoid型的单准则函数,可以很好地描述用户行为。接下来,添加了一种新的聚合方法(涉及用户偏好)来计算总体效用。效用最高的网络是用户的最佳选择。理论分析和实际仿真均证明了该算法的有效性。(6页)
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引用次数: 6
Practical implementation of self-powered wireless sensor networks for paddy field monitoring 水田监测自供电无线传感器网络的实际实现
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2106
H. Goh, Toni, Heng Yew Lee, C. F. Leong, Chian Shiun Kuek, S. Liew, K. Kwong
Wireless sensor networks (WSNs) have been widely used in various monitoring applications, each with its own deployment challenges. For instance, in the case of paddy field monitoring, such outdoor issues as antenna placement, node density, node positioning, energy constraint, base station design, and data collection have to be considered. This paper highlights the implementation challenges of WSNs for paddy field monitoring and proposes practical solutions to these challenges. In particular, solar panels are employed to address the energy constraint of the WSN. Experiments were conducted in a paddy field of size 12,000m2 within a period of seven months. The experimental data are shown and analyzed in this paper to justify our design. (6 pages)
无线传感器网络(WSNs)已广泛应用于各种监控应用,每种应用都有其自身的部署挑战。以水田监测为例,需要考虑天线放置、节点密度、节点定位、能量约束、基站设计、数据采集等室外问题。本文重点介绍了水田监测中无线传感器网络的实现挑战,并针对这些挑战提出了切实可行的解决方案。特别地,太阳能电池板被用来解决无线传感器网络的能量限制问题。试验在12000平方米的水田上进行,为期7个月。本文对实验数据进行了展示和分析,以证明我们的设计是正确的。(6页)
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引用次数: 1
Bridging digital divide in Malaysia using low cost WiMAX-WiFi multi-hop network 使用低成本WiMAX-WiFi多跳网络弥合马来西亚的数字鸿沟
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2082
Ka Kien Lo, K. Kwong, D. Chieng, A. Ting, K. Choong, M. Abbas
An integrated multi-tier, multi-hop WiMAX-WiFi network is seen as a promising solution to provide fast and low cost broadband access to places where the wired infrastructure is not ready or is too expensive. This paper investigates the potentials of deploying such network in rural Malaysia. The role of IEEE802.16 (WiMAX) WMAN technology is basically to provide backhaul support i.e. carry traffic from various access nodes to the gateway and hence the Internet, while the IEEE802.11 WLAN (WiFi) provides access service to the end users. This paper provides some insights on the capacity and coverage and performance of the proposed architecture. Its capability to provide multimedia services is also investigated using a representative village scenario in Malaysia. (6 pages)
集成的多层、多跳WiMAX-WiFi网络被视为一种很有前途的解决方案,可以为有线基础设施尚未准备好或过于昂贵的地方提供快速、低成本的宽带接入。本文调查了在马来西亚农村部署这种网络的潜力。IEEE802.16 (WiMAX)无线城域网技术的作用基本上是提供回程支持,即从各种接入节点向网关和互联网传输流量,而IEEE802.11 WLAN (WiFi)则为最终用户提供接入服务。本文提供了关于所提议的体系结构的容量、覆盖范围和性能的一些见解。还利用马来西亚一个具有代表性的村庄情景调查了其提供多媒体服务的能力。(6页)
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引用次数: 1
Delay, throughput and packet absorption rate analysis of heterogeneous WMN 异构WMN的延迟、吞吐量和包吸收率分析
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2085
S. Chien, Ka Kien Lo, K. Kwong, G. Poh, D. Chieng
The pioneering work of Gupta and Kumar [1] has inspired many subsequent studies on asymptotically achievable per node throughput and delay analysis for wireless networks. In this paper, we evaluate the delay and maximum achievable per node throughput of a heterogeneous wireless mesh network (HWMN). We derive an analytical model which incorporates diffusion approximation method [2] and then compare with the results of per node information theoretic capacity done by P. Li and Y.G. Fang [3]. The network topology consists of n normal nodes and m more powerful helping nodes in a rectangular area. Results show that higher magnitude of exponent w gives higher absorption probability which consequently reduces the delay. We found that the derived maximum achievable per node throughput is inversely proportional to the average number of hops traversed by packets, node density, and number of squares in the network. Also, we are able to obtain the result stated in [1] i.e., maximum achievable per-node throughput is according to Θ(W1/√nlogn), where W1 is normal node transmission bandwidth. (6 pages)
Gupta和Kumar的开创性工作[1]启发了许多关于无线网络渐近可实现的每节点吞吐量和延迟分析的后续研究。在本文中,我们评估了异构无线网状网络(HWMN)的延迟和最大可实现的每节点吞吐量。我们推导了一个包含扩散近似方法的解析模型[2],并与P. Li和Y.G. Fang[3]的每节点信息理论容量结果进行了比较。网络拓扑由矩形区域内的n个正常节点和m个更强大的辅助节点组成。结果表明,指数w的大小越大,吸收概率越高,从而减少了延迟。我们发现,每个节点可实现的最大吞吐量与数据包穿越的平均跳数、节点密度和网络中的方块数成反比。同样,我们能够得到[1]中所述的结果,即每个节点可实现的最大吞吐量根据Θ(W1/√nlogn),其中W1为正常节点传输带宽。(6页)
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引用次数: 2
Transmission power control in mobile wireless sensor networks: Simulation-based approach 移动无线传感器网络中的传输功率控制:基于仿真的方法
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2109
M. N. Jambli, H. Lenando, K. Zen, S. M. Suhaili, A. Tully
Saving energy is a very critical issue in wireless sensor networks (WSNs) because sensor nodes have a severe resource constraints such as lack of processing power and limited in power supply. Since the communication is the most energy consuming activities in WSNs, the power use for transmission or reception of packet should be managed properly. Transmission power control (TPC) technique is one of the techniques to reduce energy consumption which has been widely studied in mobile ad-hoc networks (MANETs). This technique is implemented by adjusting the transmission power in communication between nodes. However, as mobile wireless sensor networks (MWSNs) applications emerge, the unique characteristics of this network such as severe resource constraints and frequent topology change suggest that TPC might be useful to reduce energy consumption in MWSN. Therefore, we investigate the impact of TPC on Ad hoc On-Demand Distance Vector (AODV) routing protocol for MWSNs. AODV is used as a medium of communication to assist the investigation of the effects of TPC in multihop communication in MWSNs. The simulation results show that the implementation of TPC technique has some impact on MWSNs in respect to transmission energy consumption and transmission power level required at low node mobility.
在无线传感器网络(WSNs)中,由于传感器节点缺乏处理能力和有限的电源等资源限制,节能是一个非常关键的问题。由于通信是无线传感器网络中能耗最大的活动,因此应合理管理发送或接收数据包的功耗。传输功率控制(TPC)技术是移动自组织网络(manet)中被广泛研究的降低能耗的技术之一。该技术通过调整节点间通信的传输功率来实现。然而,随着移动无线传感器网络(MWSN)应用的出现,这种网络的独特特征,如严重的资源限制和频繁的拓扑变化,表明TPC可能有助于降低MWSN的能耗。因此,我们研究了TPC对mwsn中Ad hoc按需距离矢量(AODV)路由协议的影响。采用AODV作为通信媒介,研究了多跳通信中TPC的影响。仿真结果表明,在低节点迁移率下,TPC技术的实施对mwsn的传输能耗和传输功率有一定的影响。
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引用次数: 11
Spectrum occupancy of Malaysia radio environment for cognitive radio application 认知无线电应用中马来西亚无线电环境的频谱占用
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2071
M. Dzulkifli, M. Kamarudin, T. A. Rahman
Dynamic spectrum access technologies such as cognitive radio aim to improve the current spectrum utilisation by allowing opportunistic spectrum access to the licensed frequency bands without causing interference. However, in order to this, better understanding of the spectrum usage pattern is important. In this context, this paper presents the 24-hour spectrum survey of an outdoor radio environment in a suburban area in Johor Bahru, Malaysia in the frequency bands from 30-3000 MHz. The objectives are to investigate how the different services being allocated are utilised and identify bands that have low or no active utilisation. The result of the spectrum measurement reveals that the utilisation is 11.29% with a significant amount of spectrum underutilized is at frequencies above 1 GHz. The outcome of the study suggests that cognitive radio could indeed improve the spectrum utilisation and become the platform to provide for future wireless services. However, these studies are preliminary and future long term spectrum survey is required in better understanding and modelling of the actual spectrum usage pattern for cognitive radio applications. (6 pages)
动态频谱接入技术(例如认知无线电)旨在通过允许在不产生干扰的情况下对持牌频带进行机会频谱接入,从而改善当前的频谱利用率。然而,为了做到这一点,更好地理解频谱使用模式是很重要的。在此背景下,本文介绍了在马来西亚新山郊区的室外无线电环境的24小时频谱调查,频率从30-3000兆赫兹。目标是调查分配的不同服务是如何被利用的,并确定活跃利用率低或没有的频带。频谱测量结果显示,利用率为11.29%,在1ghz以上的频率上有大量未充分利用的频谱。研究结果表明,认知无线电确实可以提高频谱利用率,并成为提供未来无线服务的平台。然而,这些研究是初步的,为了更好地理解和模拟认知无线电应用的实际频谱使用模式,需要未来的长期频谱调查。(6页)
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引用次数: 11
Adaptive clustering with transmission power control in wireless sensor networks 无线传感器网络中具有传输功率控制的自适应聚类
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2095
D. P. Dahnil, Y. P. Singh, C. Ho
Transmission power control allows a node to dynamically change its power level for energy saving. Many adaptive clustering algorithms propose to use different power levels for clustering. However, the transmission power control had never been integrated as a step in the algorithms. Analysis of the algorithm is done based on assumption that nodes are capable of switching between different power levels. This paper attempts to highlight the possible overhead incurred due to applying power control algorithm in an adaptive clustering in Wireless Sensor Networks. The side effects of executing power control algorithm every time cluster heads rotate can possibly cancel all performance gained if communication overhead is not taken into account. This paper identifies the energy overhead and delay time as two main factors to consider for integration to be successfully implemented. We perform analysis of these factors on existing clustering algorithms such as EECS and MOECS. The analytical results show that the energy overhead is dependent on network size and the number of cluster head candidates. We also show that the delay time involved in switching power levels has to remain low for effective clustering process. (6 pages)
传输功率控制允许节点动态改变功率级别,达到节能的目的。许多自适应聚类算法提出使用不同的功率水平进行聚类。然而,传输功率控制从未作为一个步骤集成到算法中。在假设节点能够在不同功率水平之间切换的基础上,对该算法进行了分析。本文试图强调在无线传感器网络自适应聚类中应用功率控制算法可能带来的开销。如果不考虑通信开销,每次簇头旋转时执行功率控制算法的副作用可能会抵消所获得的所有性能。本文将能量开销和延迟时间确定为成功实现集成需要考虑的两个主要因素。我们对现有的聚类算法(如EECS和MOECS)进行了这些因素的分析。分析结果表明,能量开销与网络规模和簇头候选数有关。我们还表明,为了有效的聚类过程,涉及开关功率水平的延迟时间必须保持在较低的水平。(6页)
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引用次数: 1
Using multi-agent system with publish/subscribe model in a mobile framework for capturing social network users' behaviour 在移动框架中使用带有发布/订阅模型的多代理系统来捕获社交网络用户的行为
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2100
Ileladewa Adeoye Abiodun, Wai-Khuen Cheng
This paper focuses on an intelligent approach of using Smartphone to capture the users' behaviour in a social network system, namely University-Cyber AgenT (UniCAT) system through a Publish/Subscribe Model (PSM) in a mobile network. The UniCAT is a multi-agent Social Network System (SNS) that captures and simulates the behaviours and daily activities of the people of Universiti Tunku Abdul Rahman (UTAR). The main purpose of the system is to capture the SNS users' behaviours, thus reflected on software agents, with each agent structure built on a reasoning mechanism in Belief-Desire-Intention (BDI) model. A mobile version of UniCAT system is being proposed due to the convenience and feasibility in capturing more users' behaviours frequently through wireless technology, though available in UTAR but scarcely enjoyed or functional. The uniqueness of this work is that users' behaviours can be captured anywhere and anytime compared to existing desktop-based system and later information can be shared easily amongst UNICAT users because of the portability of mobile application, to save time, and for users' convenience. (5 pages)
本文重点研究了一种利用智能手机通过移动网络中的发布/订阅模型(PSM)来捕捉社交网络系统中用户行为的智能方法,即大学-网络代理(UniCAT)系统。UniCAT是一个多代理社会网络系统(SNS),捕获和模拟东姑阿卜杜勒拉赫曼大学(UTAR)人们的行为和日常活动。该系统的主要目的是捕获SNS用户的行为,从而反映在软件代理上,每个代理结构都建立在信念-欲望-意图(BDI)模型的推理机制上。目前正在提议一种移动版的UniCAT系统,因为通过无线技术经常捕捉更多用户的行为是方便和可行的,虽然在UTAR中有,但很少享受或发挥作用。这项工作的独特之处在于,与现有的基于桌面的系统相比,用户的行为可以随时随地被捕获,并且由于移动应用程序的可移植性,以后的信息可以很容易地在UNICAT用户之间共享,节省了时间,也方便了用户。(5页)
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引用次数: 5
Radio propagation prediction model for maritime mobile communication 海上移动通信无线电传播预测模型
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2075
Huifang Mo, Baodan Chen, Chong Shen
With the rapid development of coastal fisheries and marine tourism, especially fishermen in great demand for maritime mobile communication, a proper radio propagation prediction model on maritime mobile communication is indispensable. This paper presents Longley-Rice model to predict the loss of radio propagation for maritime mobile communication. Comparing with Okumura-Hata model and combing numerical simulation with matlab and analysis, predict the influence of carrier frequency and height of transmitter to transmitter loss. (5 pages)
随着沿海渔业和海洋旅游业的快速发展,特别是渔民对海上移动通信的需求越来越大,一个合适的海上移动通信无线电传播预测模型是必不可少的。本文提出了预测海上移动通信中无线电传播损耗的朗利-赖斯模型。通过与Okumura-Hata模型的比较,结合matlab的数值模拟和分析,预测了发射机载波频率和发射机高度对发射机损耗的影响。(5页)
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引用次数: 9
Fusion of navigation technology and E-Learning systems for on-the-spot learning 导航技术与E-Learning系统融合,实现现场学习
Pub Date : 1900-01-01 DOI: 10.1049/cp.2012.2097
Shivendra Tiwari, Saroj Kaushik
Huge information is inherently associated with certain places in the globe. The ancient cities have multiple locations with large historical, geographical, cultural and architectural specialties. E-Learning systems allow the learners to learn irrespective of their time and place. The location based learning (LBL) is another aspect where the site seeing, and touching the building walls are the means of real-time experience of the sites. This manifestation motivates us to extend the capabilities of conventional E-learning systems so that the information can be accessed at the real-time based on the user's location. In this paper, the e-Learning system is used for the LBL with the help of navigation capabilities without modifying the existing systems. The learning content geocoding, reverse-geocoding, and real-time learning plan generation based on the user preferences and constraints have been proposed. The on-the-way learning is another aspect of the LBL that has been proposed with a prototype implementation. The implemented system is a flexible and visually appealing LBL platform with a possibility to get the real-time location specific information both from webdatabases and locally stored content. (6 pages)
巨大的信息本质上与地球上的某些地方有关。古城有多个地点,具有很大的历史、地理、文化和建筑特色。电子学习系统允许学习者在任何时间和地点学习。基于位置的学习(location based learning, LBL)是另一个方面,通过现场观看和触摸建筑墙体来实现现场的实时体验。这种表现促使我们扩展传统电子学习系统的功能,以便可以根据用户的位置实时访问信息。本文在不修改现有系统的情况下,利用导航功能将电子学习系统用于LBL。提出了基于用户偏好和约束的学习内容地理编码、反向地理编码和实时学习计划生成。路上学习是与原型实现一起提出的LBL的另一个方面。所实现的系统是一个灵活且具有视觉吸引力的LBL平台,可以从web数据库和本地存储的内容中获取实时位置特定信息。(6页)
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引用次数: 4
期刊
IET International Conference on Wireless Communications and Applications
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