Performance Analysis of Location-Aware Mobile Service Proxies for Reducing Network Cost in Personal Communication Systems

We propose and analyze mobile service management schemes based on location-aware proxies with the objective to reduce the network signaling and communication cost in future personal communication systems (PCS). Under these schemes, a mobile user uses personal proxies as intelligent client-side agents to communication with services engaged by the mobile user. A personal proxy cooperates with the underlying location management system so that it is location-aware and can optimally decide when and how often it should move with the roaming user. We show that, when given a set of model parameters characterizing the network and workload conditions, there exists an optimal proxy service area size for service handoffs such that the overall network signaling and communication cost for servicing location and service operations is minimized. We demonstrate via Petri net models that our proposed proxy-based mobile service management schemes outperform non-proxy-based schemes over a wide range of identified conditions. Further, when the mobile user is concurrently engaged in multiple services, the per-service proxy scheme that uses a separate proxy for each service outperforms the aggregate proxy scheme that uses a single proxy to interface with multiple services taking their aggregate service characteristics into consideration. Baoshan Gu received the BS degree from University of Science and Technology of China, Hefei, China, in 1992 and the MS degree in computer science from Institute of Computing Technology, Chinese Academia of Science, Beijing, China, in 1995. From 1995 to 2000, he was a research and development engineer in Institute of Computing Technology, Chinese Academia of Science. He is currently pursuing his PhD degree in the Department of Computer Science, Virginia Tech, where he is a research assistant in the Systems and Software Engineering Laboratory. His research interests include next-generation wireless system architectures, design and evaluation of location and service management schemes in mobile computing environments, and mobile database systems. Ing-Ray Chen received the BS degree from the National Taiwan University, Taipei, Taiwan, and the MS and PhD degrees in computer science from the University of Houston, Texas. He is currently an associate professor in the Department of Computer Science at Virginia Tech. His research interests include mobile computing, pervasive computing, multimedia, distributed systems, real-time intelligent systems, and reliability and performance analysis. Dr. Chen has served on the program committee of numerous conferences, including being as program chair of 14th IEEE International Conference on Tools with Artificial Intelligence in 2002, and 3rd IEEE Symposium on Application-Specific Systems and Software Engineering Technology in 2000. Dr. Chen currently serves as an Associate Editor for IEEE Transactions on Knowledge and Data Engineering, The Computer Journal, and International Journal on Artificial Intelligence Tools. He is a member of the IEEE/CS and ACM.This revised version was published online in August 2005 with a corrected cover date.     

基于移动通信网络的个人信息管理业务

基于移动通信网络的个人信息管理（Personal Information Management,PIM）业务是指为移动用户提供多种接入和使用方式,将移动终端中的个人信息与移动网络服务器保持一致,并能查询和管理这些信息。早期的PIM应用只是基于用户本机的操作或基于Internet的应用。随着移动通信的高速增长、无线产品对PIM应用的支持,支持和提供PIM业务正逐渐成为各大主流品牌手机的标准配置。     

综合业务无线个人通信系统

综合业务无线个人通信系统（ＩＳＲＰＣＳ）将与信息高速公路并存且会使其无限延伸。本文从ＩＳＲＰＣＳ业务需求出发，介绍了该系统设计应着重考虑的一些问题及传输体制，对无线介质可能采用的两种物理层，一种媒体入口控制和数据链作了较为详细的介绍。     

Hierarchical Group Location Tracking for Transportation Systems in Wireless Personal Communication Networks

A hierarchical group location tracking (HGLT) based on grouplocation tracking and hierarchical location update is proposed toreduce the location management cost for terrestrialtransportation systems (TSs) in personal communication networks. A global group location update (GGLU) and a local group locationupdate (LGLU) are performed to provide an accurate position for auser. The GGLU informs a virtual visitor location register of thecurrently camped-on location area and the LGLU informs the servingmobile switching center of the currently camped-on cell. Althoughthe LGLU is done each time a TS moves into a new cell, it causessmall increment in the signaling cost due to localized updates andgroup updates compared with the previous group location trackingscheme. The proposed scheme significantly reduces the paging costbecause the scheme pages only a camped-on cell using the LGLUinformation. Compared with the previous schemes, the HGLT reducesthe location management cost, and it is more efficient as thecost for paging a cell increases.     

数据通信网综合网管的设计分析

结合TMN电信管理网的体系结构．对数据通信网综合网管的结构和功能进行了分析。     

天津移动通信网管系统

介绍了天津移动通信网管系统开发建设的必要性及所开发网管系统的特点、系统网络、软硬件的结构、功能和应用的效果。     

Cooperative Location Management for a Cellular Network with Ad Hoc Communication

The cellular network with ad hoc communication has been foreseen in the next-generation mobile communication system. For such a network, a distance-based (DB) location management scheme cooperated with the ad hoc assistance node (DBCAN) is proposed in this paper. Allowing a mobile terminal to pass its mobility information to the ad hoc assistance node (AAN) with appropriate location updating, DBCAN can effectively reduce the paging cost and limit the paging delay. Moreover, DBCAN includes a method to determine whether AANs should be utilized or not to make cost effective. Our simulation results show that DBCAN can effectively reach cost reduction and still get performance improvement even if the probability to successfully deliver mobility information to AANs falls to the median level.     

一体化卫星通信网络管理平台设计

随着卫星通信应用的快速发展,卫星通信地面系统需要管理的卫星资源、用户资源越来越多,现有的网络管理平台主要采用专网专用的设计方法,通用性差,维护困难,已无法满足资源共享共用、跨网互联互通和易学易用等应用需求。通过对现有卫星通信网络管理平台的组成、特点及应用需求进行分析,利用资源虚拟化思想对物理资源、管理功能、管理流程、界面及接口进行归一化处理,设计了资源统一管理、业务互联互通、统一呈现及灵活扩展的一体化网络管理平台。     

Smart Routers for Cross-Layer Integrated Mobility and Service Management in Mobile IPv6 Systems

We propose and analyze a cross-layer integrated mobility and service management scheme called DMAPwSR in Mobile IPv6 environments with the goal to minimize the overall mobility and service management cost for serving mobile users with diverse mobility and service characteristics. The basic idea of DMAPwSR is that each mobile node (MN) can utilize its cross-layer knowledge to choose smart routers to be its dynamic mobility anchor points (DMAPs) to balance the cost associated with mobility services versus packet delivery services. These smart routers are just access routers for MIPv6 systems except that they are capable of processing binding messages from the MN and storing the current location of the MN in the routing table for forwarding service packets destined to the MN. The MN’s DMAP changes dynamically as the MN roams across the MIPv6 network. Furthermore the DMAP service area also changes dynamically reflecting the MN’s mobility and service behaviors dynamically. Unlike previous mobility management protocols such as HMIPv6 that focus only on mobility management, DMAPwSR considers integrated mobility and service management. We develop an analytical model based on stochastic Petri nets to analyze DMAPwSR and compare its performance against MIPv6 and HMIPv6. We validate analytical solutions obtained through extensive simulation including sensitivity analysis of simulation results with respect to the network coverage model, the MN’s residence time distribution and the DMAP service area definition.     

Optimum Power Assignment for Maximum Throughput in CDMA Personal Communication Systems with Integrated Voice/Data Traffic

A CDMA personal communication system with integrated voice/data traffic is considered, in which the link error performance is controlled according to the voice error rate requirement, and the acceptable data traffic error rate is ensured by ARQ. Optimum power assignment (or allocation) between voice and data users is investigated to maximize the total system throughput. A graphical method (the tangent method) is described to obtain this optimum power allocation. The maximum throughput is expressed as a function of other system parameters. The tangent method is further used to measure the impact of transmission quality on the maximum data throughput. Numerical results and a design example are given for a power controlled wideband IS-95 type wireless personal communication system.     

移动通信位置管理信令开销及位置区设计优化

指出了位置区设计方案在移动通信网络规划中的重要性，分析了各参数对于位置管理信令开销的作用。同时探讨了位置区及路由区范围、形状等参数变化对不同特征用户群的位置管理信令开销的影响。由此总结出如何针对不同用户特征设计合理位置区的基本原则。     

个人移动通信系统概况及展望

介绍了蜂窝系统,低功率系统、无线ＬＡＮ／ＷＡＮ,卫星系统等个人移动通信系统,以及ＩＭＴ－２０００、ＰＣＳ等第三代数字移动通信系统,并展望其未来的发展方向。     

光纤通信用光电集成电路

本文介绍了光电集成电路(OEIC)工艺技术的新思想和新方法;叙述了光纤通信用 OEIC 器件的新结构与特性;分析了 OEIC 用于光纤通信的几个问题。     

A Novel Location Tracking Scheme for Reducing Location Updating Traffic in a Personal Communication System

How to reduce location updating traffic is a critical issue for tracking the current locations of users in a personal communication system. Traditional location management approaches usually bring about network overload or bottleneck of the HLR when a mobile user moves back and forth between adjacent location areas. So far, many works have focused on this research topic to solve the location updating rate or the location updating cost. In this paper, we shall employ both concepts of time stamp and virtual overlapping to propose a newly developed scheme for reducing both the location updating rate and the location updating cost. From the simulated results, our scheme can significantly reduce the location updating traffic.     

Integrated Broad-Band Communication Systems in Belgium

Belgian politicians, the National Telecommunications Administration (RTT), and the telecommunication industry in general fully realize the major economic, industrial, and social importance of an advanced telecommunications infrastructure for the future of the country. A national effort is therefore underway. This paper describes the specific Belgian telecommunications environment, its development towards an ISDN infrastructure, and evolution towards the integration of telecommunication and distribution services into a uniform broad-band communication network. The present network structures for both telecommunication and distribution services are briefly discussed in this paper. Furthermore, plans and experiments in the area of ISDN are also described. Explanations related to the basic concepts of a national integrated broad-band communication network and possible architectures for a demonstration project are given.     

增值业务综合网管系统的数据管理及数据采集方案

主要根据移动增值业务的特点,结合增值业务综合网管系统对于业务管理的要求,给出了综合网管系统架构数据管理的方案与建议,为了兼顾效率与系统数据的准确性,也提出以规范要求的数据上报与综合网管自身分析验证结合的数据采集方案。     

综合网管系统的设计方法及应用实例

本文讨论和总结了实现综合网管系统(INMS)的几种方式的特点.结合金桥网综合网管系统(GBINMS)的设计和实现,本文详细讨论了实现INMS的一些理论和技术问题.此外,本文还提出了一种“根据配置处理MIB数据”的方法,使INMS高效和可扩展.     

无线个人通信网及其技术

本文简要介绍了无线个人通信网的基本概念和网络结构,讨论了实现无线个人通信的3种方案,并指出其关键技术。     

接入网综合网管对策

本文通过分析接入网网管特点和应用现状，提出了采用基于Intranet/Web进行接入网综合管理的分布式管理模式，讨论了其特点，最后介绍了标准化和应用进展。