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为了对异构终端进行有效聚合,解决泛在末梢环境中网络资源和终端能力有限性带来的多用户效益冲突分配问题,该文提出一种均衡多业务的终端聚合机制(DCMME)。首先以相对熵为均衡性指标设计了均衡服务质量效益函数,建立了面向多业务的终端聚合问题模型(MODC);然后,该机制对问题模型进行降维简化,提出了基于均衡的终端聚合算法(EDC);最后,通过C++和MATLAB仿真表明,在该机制下,用户均衡性改善了0.5%~20%,由此证明该方法很好地权衡和保证了多泛在业务请求下各用户效益。 相似文献
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本文提出了一种基于移动终端业务的多接入网络选择算法,该算法将网络选择的单位从终端转向业务,并通过如下三个步骤为业务确定一个最优接入网络集合:首先,通过充分考虑业务的实际QoS需求以及终端速度的影响,确定各决策因素的权重;其次,通过效用函数模型确定各接入网络的效用函数矩阵;最后,通过最优接入网络集确定适合业务传输的最优接入网络组合。仿真结果表明:本文提出的新算法能根据终端移动速度及业务需求为业务选择最优网络组合,同时能大幅度提高终端网络的吞吐量。 相似文献
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提出了一种基于移动终端业务的多接入网络选择算法,该算法将网络选择的单位从终端转向业务,并通过如下3个步骤为业务确定一个最优接入网络集合:首先,通过充分考虑业务的实际QoS需求以及终端速度的影响,确定各决策因素的权重;其次,通过效用函数模型确定各接入网络的效用函数矩阵;最后,通过最优接入网络集确定适合业务传输的最优接入网络组合.仿真结果表明:提出的新算法能根据终端移动速度及业务需求为业务选择最优网络组合,同时能大幅度提高终端网络的吞吐量. 相似文献
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为充分利用用户周围的网络资源以及终端资源,为用户提供更优质的用户体验,终端协同成为研究热点.针对基于终端协同的多流并行传输问题,提出了一种多属性决策的并行多流速率分配算法.进行从终端选择时,通过多属性决策算法综合考虑终端用户主观喜好,以及各终端及其接入网之间的客观差异.在速率分配的过程中,以各网络资源为约束,不断地进行速率调整.此算法在实现从终端选择的同时完成了各协同终端之间的速率分配.通过仿真后的性能分析表明,所提算法不仅能够充分利用优势网络的资源,还可满足网络资源的约束以及减少能耗,同时也能满足用户业务体验. 相似文献
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在异构无线环境中,为了给运行了多个业务(群呼叫)的移动终端选择一个合适的无线接入网络,提出了一种基于群决策的接入选择方法。该方法引入效用函数对网络QoS及功耗进行评价;根据业务特点分配各属性的模糊权重,并采用业务优先权来反映各业务在群决策中的相对重要性;基于模糊理论,设计合理的模糊TOPSIS数据聚合模型,并在效用评价基础上实现了群决策。仿真结果表明,该方法能有效地实现多业务的无线接入选择,并且业务优先权在很大程度上影响了群决策结果。 相似文献
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Modern service industry has been the new point of economic growth, which is on the basis of information and communication technologies. Heterogeneous networks convergence is the trend for the development of information and communication technologies. This paper proposes a capacity adaptation algorithm to implement the network and terminal collaborative selection functions. The AHP and GRA algorithms are introduced for heterogeneous network selection, in which the AHP algorithm is aimed to calculate the weight parameters and the GRA algorithm is to select the best target network. The AHP and SAW algorithms are adopted to complete the terminal selection on basis of terminal attributes. Simulations and analysis show that capability adaptation can achieve network and terminal selection in heterogeneous networks for many services and applications. 相似文献
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One of the key issues for radio resources management is network selection strategy in heterogeneous scenarios.In order to provide ubiquitous service,the paper puts forward a network selection algorithm based on multiple attribute decision making(MADM) and group decision making(GDM).Firstly,the proposed algorithm acquires attribute weights’ vectors of the subjective and objective decision makers based on MADM,and then the two attribute weights’ vectors are synthesized to be a new attribute weights’ vector by using GDM.Considering that the results of GDM should be reasonable and convincible,the criterion of consistency is adopted for judging the compatibility of group judgments.More specifically,the algorithm takes into account not only objective attributes of networks but also the preference of subscribers and traffic class.Hence it guarantees that the subscribers can not select the networks with poor performance depending on their preference.The simulation results show that the proposed algorithm can effectively reduce the handoff number and provide subscribers with satisfactory quality of service(QoS). 相似文献
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In order to capture and maintain a representative share of the wireless communication market, effective ways to manage the scarce physical resources of cellular networks are fundamental for cellular network operators. In this context, this paper proposes an adaptive Radio Resource Allocation algorithm that targets the user satisfaction maximization in cellular networks with multiple services. The proposed algorithm is mathematically derived from a utility-based cross-layer optimization framework and employs user weights as well as an innovative service weight that is adapted to meet the satisfaction target of the most prioritized service. Furthermore, the proposed algorithm is scalable to several services classes and can be employed in the current and future generations of wireless systems that guarantee orthogonality among the allocable resources. The performance evaluation is conducted in realistic scenarios of the downlink of an Orthogonal Frequency Division Multiple Access based cellular network serving video and Constant Bit Rate flows, where we assume imperfect Channel State Information at the transmitter. Significant gains in the joint system capacity were obtained, demonstrating that the adaptability and service prioritization allow the accomplishment of simultaneously maximizing the user satisfaction for distinct services. 相似文献
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Bandwidth-guaranteed QoS service in ad hoc networks is a challenging task due to several factors such as the absence of the central control, the dynamic network topology, the hidden terminal problem and the multihop routing property. An end-to-end bandwidth allocation algorithm was proposed in [Lin and Liu, 15] to support the QoS service in ad hoc networks. However, without exploring the global resource information along the route, the performance of that algorithm is quite limited. In addition, it also incurs significant control overhead. We develop a new algorithm for end-to-end bandwidth calculation and assignment in ad hoc networks which utilizes the global resource information along the route to determine the available end-to-end bandwidth. Our method also employs the topology-transparent scheduling technology to reduce the control overhead. The proposed algorithm can be efficiently utilized in a distributed manner. Both theoretical analysis and simulation results show that our end-to-end bandwidth allocation scheme can significantly improve the network capacity compared with the existing method. 相似文献
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Internet of Things (IoT) as an important and ubiquitous service paradigm is one of the most important issues in IoT applications to provide terminal users with effective and efficient services based on service community. This paper presents a semantic-based similarity algorithm to build the IoT service community. Firstly, the algorithm reflects that the nodes of IoT contain a wealth of semantic information and makes them to build into the concept tree. Then tap the similarity of the semantic information based on the concept tree. Finally, we achieve the optimization of the service community through greedy algorithm and control the size of the service community by adjusting the threshold. Simulation results show the effectiveness and feasibility of this algorithm. 相似文献
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负载均衡是提高集群系统性能的重要技术,负载均衡技术可以在当前的网络应用结构上有效提高服务器处理能力,使系统在现有的结构下能够满足更多的用户同时访问所提供的服务,负载均衡算法是集群任务分配的核心。分析了影响服务节点性能的主要因素,基于SED算法提出了一种负载均衡的自适应机制,根据服务节点的性能状况自动调整权值。在Linux平台下进行了实验,测试结果显示该算法优于静态算法。 相似文献
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