A Multiagent Platform for Ubiquitous Service Provision

The Virtual Home Environment is very important in contemporary mobile telecommunications infrastructure as it caters for the ubiquitous provision of services irrespective of network, location and user device. The universality of systems like Universal Mobile Telecommunications System and wi-fi increases the need for the rapid introduction of efficient VHE schemes. In this paper, we study the adoption of Mobile Agents for handling the VHE functionality. Mobile agents are nicely harmonized with the broader idea of VHE as they allow the autonomous execution of tasks by components that roam from node to node and network to network. We present the detailed modeling of a VHE provisioning architecture and investigate its suitability for different use cases and technical options (e.g., end user devices). The adoption of mobile agents for the ubiquitous provision of telecommunication services is quite promising in terms of efficiency. Through a series of experiments we quantify the performance benefits stemming from the adoption of mobile agents in contrast to conventional service provisioning schemes.     

A dynamic resource management in mobile agent by artificial neural network

In this paper, a resource management for dynamic load balancing in mobile agent by artificial neural network scheme (ANN-DLB) is presented to maximize the number of the served tasks in developing high performance cluster. This dynamic load balance with the growth of the service type and user number in the mobile networks of the higher performance is required in service provision and throughput. Most of the conventional policies are used in load indices with the threshold value to decide the load status of the agent hosts by CPU or memory. The main factor influencing the workload is the competitions among the computing resources such as CPU, memory, I/O and network. There are certain I/O data of the intensive applications where load balancing becomes the important issue. This relationship between the computing resources is very complex to define the rules for deciding the workload. This paper proposed a new dynamic load balancing for evaluating the agent hosts’ workload with the artificial neural network (ANN). By applying the automatic learning of the back-propagation network (BPN) model can establish the ANN model and also can measure the agent host loading with five inputs: CPU, memory, I/O, network and run-queue length. The structure of the load balancing system is composed of three design agents: the load index agent (LIA), the resource management agent (RMA) and the load transfer agent (LTA). These experimental results reveal that the proposed ANN-DLB yields better performance than the other methods. These results demonstrate that the proposed method has high throughput, short response time and turnaround time, and less agent host negotiation complexity and migrating tasks than the previous methods.     

动态构造虚拟公共网络服务的一个多agent协商模型

该文通过对IP网络管理中多个移动agent动态构造虚拟公共网络VPN的研究,采用基于QoS服务的多属性的动态协商定价模型,在多agent之间形成了利益最大化的服务协议,以此应用实例表明移动agent是解决异构、分布、自治环境的复杂IP网管的有效软件体系结构。     

基于OSA/Parlay的多媒体个人移动业务管理系统计费业务UML设计

介绍了VHE理论模型和OSA/Parlay标准规范,提出了多媒体个人移动业务的体系结构模型,对基于OSA/Parlay标准的多媒体个人移动业务的管理系统作出了总体设计,并使用UML技术设计了管理系统中的计费业务,给出了Use Case总体视图和计费流程。     

Performance Monitoring of Remote Websites Using Mobile Agents

In this paper, a mobile agent based approach is investigated to provide the underlying framework for monitoring the performance tests at a remote website. Mobile agents are autonomous and dynamic entities that can migrate between various nodes in the network. They offer many advantages over traditional design methodologies, including: reduction in network load, overcoming network latency and disconnected operations. This research aims to explore the adaptability of the mobile agent approach for website performance testing. It analyses the applicability of mobile agents in carrying out a monitoring task. We have designed and implemented the monitoring framework. The performance of mobile agents is compared with the non-agent approach. Analyzing the results for the same purpose and environments, the mobile agent approach performs better in reducing the load on the host server and saving communication bandwidth than the traditional approaches.     

Mobile Agent Connection Establishment and Management (CEMA)—Message Exchange for Pervasive Computing Environments

Pervasive computing is an emerging technology that offers new possibilities to distributed computing and computer networking; it employs a wide variety of smart, ubiquitous devices throughout an individual's working and living environment. Mobile agents are software entities that can migrate between servers (mobile agent environments) of the network accomplishing various tasks on the behalf of their owners. The objective of this paper is to describe a test and prototyping environment for experimenting with mobile agents in pervasive environments. A prototype environment for a novel, proactive infrastructure is described for mobile agent assisted pervasive computing. In addition, a new message passing algorithm is provided for mobile agent connection establishment and management (CEMA). Simulation results show the performance of the proposed approach.     

一个新型嵌入式移动性支持方案

IETF的移动IP协议存在代理的部署少、三角路由增加网络开销以及操作系统的支持有限等问题,未得到广泛应用。该文针对移动IP协议的不足,提出了一个新型的嵌入式移动性支持方案。该方案引入嵌入式移动代理和地址索引服务器来实现移动管理,最大限度地减小了移动管理对网络基础设施的依赖,为单个或成组移动设备提供了透明的移动服务。仿真实验表明,该移动性方案开销小、效率高,易于实现。     

Performance evaluation of a mobile agent-based platform for ubiquitous service provision

The Virtual Home Environment (VHE) is a very important mechanism in the upcoming mobile telecommunications infrastructure, providing a ubiquitous approach in the delivery of services. The universality of systems like UMTS and WLANs increases the need for efficient introduction of VHE. In this paper, we discuss the adoption of Mobile Agents (MA) for coping with the VHE technical challenges. We present the detailed design of an integrated, open and extensible architecture, by taking into account a variety of use cases and technical alternatives (mobile devices, fixed terminals). Relevant implementations are presented to indicate the feasibility of the technical orientation discussed. Finally, we study and compare the performance of the proposed agent based framework with a conventional solution.     

基于移动代理具有拥塞控制的AODV路由协议

提出一种基于移动代理的AODV路由协议,来解决Ad Hoc网络的拥塞问题.在网络中引入一定数量的携带拥塞状态的移动代理,移动代理在网络中漫游时选择轻负载的节点为下一跳,并根据节点拥塞状态更新路由表,用较少的信息流量使每个节点及时了解当前网络的拓扑状况.实验结果表明这种路由算法可以有效地平衡网络负载,大大增强了链路的稳定性,降低了端到端的数据传输时延.     

一种基于移动Agent的异构网络管理模型

分析了集中式网络管理方法的局限性,介绍了移动Agent的特点及与传统方法相比的优势,提出了一种针对异构网络的基于移动Agent的网管模型,详细地介绍了该模型的设计思想、结构、管理方式及安全性、容错性、独立性等特点。设计实现了两种移动Agent:故障诊断代理和故障搜索代理。使用它们评估和验证了移动A gent管理实际的异构网络的能力,它们能够在一个特定大小的网络中准确定位故障并分析故障的原因。     

基于移动代理的网络管理系统的研究与设计

目前简单网络管理协议（SNMP,Simple Network Management Protocol）已经是网络管理软件的实际标准,随着网络技术的日新月异,对网络管理的要求也越来越高,现有的网络管理方法的缺陷也逐渐突出。针对这些问题,提出基于移动代理的网络管理方案,它对移动代理技术和SNMP协议进行了很好的结合,并选用IBM Aglets移动代理开发平台,设计了一种高效的网络管理体系结构。     

一种基于复制组管理的移动agent容错模型

可靠性是影响目前移动agent应用扩展的一个关键问题之一,现有的分布式系统的容错方法不能完全照搬,该文提出一种基于复制组管理的移动agent容错模型ReGFatoM,通过改进已有的阶段构建模式以及加强复制组管理来提高系统的可靠性,实验表明,ReGFatoM能够有效解决诸如“只一次”执行、阻塞、网络分割等容错问题,而且具有模块化、效率高的优点。     

Hierarchical agent-based secure and reliable multicast in wireless mesh networks

We propose and analyze a hierarchical agent-based secure and reliable multicast (HASRM) algorithm for efficiently supporting secure and reliable mobile multicast in wireless mesh networks, with design considerations given to minimize the overall network cost incurred by reliable multicast packet delivery, mobility management, security key management, and group membership maintenance. HASRM dynamically maintains a group of multicast agents running on mesh routers for integrated mobility and multicast service management and leverages a hierarchical multicast structure for secure and reliable multicast data delivery. The regional service size of each multicast agent is a key design parameter. We show via model-based performance analysis and simulation validation that there exists an optimal regional service size that minimizes the overall communication cost and the optimal regional service size can be dynamically determined. We demonstrate that HASRM under optimal settings significantly outperforms traditional algorithms based on shortest-path multicast trees extended with user mobility, security, and reliability support. We also show that a variant of HASRM is superior to a recently proposed multicast algorithm for secure group communication in wireless mesh networks.     

GCS-MA: A group communication system for mobile agents

Reliable messaging is a key component necessary for mobile agent systems. Current researches focus on reliable one-to-one message delivery to mobile agents. But how to implement a group communication system for mobile agents remains an open issue, which is a powerful block that facilitates the development of fault-tolerant mobile agent systems. In this paper, we propose a group communication system for mobile agents (GCS-MA), which includes totally ordered multicast and membership management functions. We divide a group of mobile agents into several agent clusters, and each agent cluster consists of all mobile agents residing in the same sub-network and is managed by a special module, named coordinator. Then, all coordinators form a ring-based overlay for interchanging messages between clusters. We present a token-based algorithm, an intra-cluster messaging algorithm and an inter-cluster migration algorithm to achieve atomicity and total ordering properties of multicast messages, by building a membership protocol on top of the clustering and failure detection mechanisms. Performance issues of the proposed system have been analysed through simulations. We also describe the application of the proposed system in the context of the service cooperation middleware (SCM) project.     

基于移动代理的网络管理系统的研究与设计

移动代理是一项新兴的技术,因其具有移动性、智能性、并行性等特点,在网络及分布式计算等领域有着广泛的应用。文章分析了基于移动代理的网管系统在网络管理领域的优势,讨论了将移动代理网管系统与SNMP网管系统相结合的网管系统设计框架,并给出了性能管理、故障管理和安全管理的功能模块设计,最后介绍了使用的开发环境,以及将两种网管系统相结合的实现方法。     

网络管理数据采集的自适应算法研究

大型动态网络上网管数据的采集,由于网络本身复杂性的不断增加而越来越困难,尤其是网络的动态性和可伸缩性等问题,为此利用移动代理实现分布式监测系统.提出了基于这种思想下的代理定位的一种分布式算法,该算法主要是基于局部信息进行代理的定位,从而可以减少网络管理的数据流量,实现系统的适应性.     

Multicast routing in mobile ad hoc networks by using a multiagent system

Multicast routing in mobile ad hoc networks (MANETs) poses several challenges due to inherent characteristics of the network such as node mobility, reliability, scarce resources, etc. This paper proposes an Agent Based Multicast Routing Scheme (ABMRS) in MANETs, which uses a set of static and mobile agents. Five types of agents are used in the scheme: Route manager static agent, Network initiation mobile agent, Network management static agent, Multicast initiation mobile agent and Multicast management static agent. The scheme operates in the following steps: (1) to identify reliable nodes; (2) to connect reliable nodes through intermediate nodes; (3) to construct a backbone for multicasting using reliable nodes and intermediate nodes; (4) to join multicast group members to the backbone; (5) to perform backbone and group members management in case of mobility. The scheme has been simulated in various network scenarios to test operation effectiveness in terms of performance parameters such as packet delivery ratio, control overheads and group reliability. Also, a comparison of proposed scheme with MAODV (Multicast Ad hoc on-demand Distance Vector) protocol is presented. ABMRS performs better than MAODV as observed from the simulation. ABMRS offers flexible and adaptable multicast services and also supports component based software development.