认知网络中具有自主学习特征的智能QoS保障机制研究
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摘要
认知行为模型首先检测网络当前的状态,然后根据观察到的网络条件和参数进行调整、判决、执行。认知技术使得通信实体具有认知周围环境的能力,并能根据周围环境的变化智能、自主、自适应地动态变化。将认知的概念和功能引入现有的信息网络就构成了认知网络。然而,以端到端QoS (Quality of Service)性能最优化为目标的认知网络的研究在国内外还都处于萌芽阶段,仅有一个大致的网络概念模型和少量认知路由算法。认知网络中QoS机制的实现,即资源预约、资源调度和管理等问题至今还缺乏可行的解决方案。因此,本文将基于网络行为模型,研究认知网络的QoS保障机制,本文是国家高技术研究发展计划(863计划)课题的一部分。
     本文主要提出了三个算法和机制,包括基于蚁群算法的多径路由并行传输协议、预留资源的自适应借用策略、以及基于神经网络的混合网络流量预测模型。详细内容如下。
     (1)在认知网络中支持流媒体传输的多径路由算法方面,本文通过改进蚁群算法,提出能够规避和快速缓解拥塞的多径路由协议命名为AMP算法。AMP算法在源节点和目的节点之间寻找多条独立的可用路径,并构成有效传输路径集。根据每条路径上的带宽资源和网络负载情况,对集合中的路径进行优先级排队,确定多条传输路径并行传输,改善流媒体业务的服务质量。当主路由发生拥塞时,迅速使用路径集中的备用录用替换原有路由,保证传输的连续性。同时,启动新的路径搜索算法,即在目的节点和源节点同时发送寻路蚂蚁,双方向发现新路由,能够更加迅速的发现新路径,规避拥塞。另外,AMP算法使用改进了的蚂蚁寻路准则,使得该算法可以实现多QoS约束的最优路由,即同时满足时延和带宽约束的路由。
     (2)在预留资源的自适应借用与吞吐量优化方面,本文引入自适应借用的思想,提出了预留资源的借用策略,命名为RBFR策略。在传统的信息网络中,预留资源在有效期内具有独占性和专用性,而数据业务的突发特点使发送端输出的数据流不连贯,造成相应的预留资源不定期的处于闲置状态,导致资源浪费。在网络负载较重的情况下,占整体资源比例较大的预留资源有部分闲置,而网络中剩余的可用资源无法满足更多应用的接入需求,限制了吞吐量的提高。因此,充分利用认知网络的自学习和重配置功能,实现预留资源的自适应借用,是提高网络吞吐量、改进网络性能的重要手段。于是,本文将节点的资源类型分为三类:预留资源、本地资源和额外资源,提出在保证已预留资源的数据流服务质量的前提下,允许实时业务在满足相应规定时借用节点闲置的预留资源,非实时业务不允许借用其他节点的资源。RBFR策略还给出了相应的资源分配和借用规则,并使额外资源在使用完毕后按本文给出的规则归还。RBFR策略不仅保证了实时业务和非实时业务的公平性,而且可以灵活协调多种业务,优化配置网络资源,改善系统整体吞吐量,提高资源利用效率。
     (3)在认知网络的流量调度与负载均衡方面,本文将神经网络的预测方法引入认知网络,提出基于神经网络的混合神经网络预测模型,命名为Ant Double-BP模型。该模型利用神经网络的非线性处理和容噪能力,综合考虑终端的分布状况和用户业务的QoS需求,实时跟踪网络状态,预测网络流量。另外,该模型使用蚁群算法训练BP (Back Propagation)神经网络的权值,使得BP网络的权值不依赖于训练样本;并在拟合之前剔除原始数据中的异常数据,这些做法都排除了训练样本对模型精度的影响。同时,使用混合的小波神经网络模型预测网络流量,提高了对非线性、多时间尺度变化的网络流量的预测精度。
The network state is detected by cognitive networks model first, then the cognitive networks could do adjust, judgement and execution based on the conditions it observed. Cognitive network can perceive the external environment; intelligently and automatically change its behavior to adapt to the environment. It is more appropriate to provide security for users with QoS (Quality of Service). The study of cognitive networks for optimizing the end-to-end QoS is in its infancy stage at home and abroad, only a general concept model and a few cognitive routing algorithms. The implementation of QoS mechanisms in the cognitive networks, that is, classification and definition of the QoS parameters, access control and negotiation, resource reservation, resource scheduling and management, is not solved yet. So, in this dissertation, I will study the QoS guarantee mechanisms based on cognitive networks, which is one part of the High Technology Research and Development Program of China (863Plan)(No.2009AA01Z11).
     Three algorithms and mechanisms are proposed in this dissertation, including ant-based multiple-path routing algorithm with congestion avoidance, resource borrowing from reservation strategy and a network traffic prediction model based on hybrid neural network.
     (1) In order to support multiple-path transmission of streaming media, an ant-based multiple-path routing algorithm with congestion avoidance (AMP) is proposed in this dissertation, through analyzing the present multiple-path routing algorithm and ant algorithm. It adopts double-way ant-exploration methods to speed up the exploration for the optimal routes. The new guide line better satisfies the demands of OoS. Simulation contrast with OPNET shows that the algorithm is valid and effective in controlling the packet loss ratio, delay and the residual bandwidth.
     (2) For the adaptive borrowing of reservation resources and throughput optimization, we adopt adaptive borrowing idea in this dissertation and propose a strategy which borrowing resource from idle reservation (RBFR) according to the characteristics and advantages of cognitive networks. The proposed strategy adds function module in nodes. First, it considers the type of new requests, and then assigns resource according to their different parameters. If the available resource can not meet the requirements of the new request, real-time request is accesses of higher priority and borrows the idle reservation from non-real-time business appropriately. Comprehensive simulations show that, RBFR has good performance at packet loss rate, network resource utilization and the rejected rate of new requests.
     (3) In order to realize the traffic scheduling and load balancing, a hybrid traffic prediction model (Ant Double-BP model) is proposed in this dissertation, which training BP algorithm with Ant Colony System based on the analysis of the present models. It avoids the problem of slow convergence speed and easily falling into local optimum problem existed in the gradient descent method. Besides, before the prediction, we reject the abnormal data in the recognition network first, and then begin wavelet decomposition, at last we predict the network traffic with the hybrid model, thus the traffic prediction with high-precision in cognitive network will be achieved.
引文
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