面向固定移动融合环境的P2PSIP系统设计

全业务运营是电信市场继语音和宽带接入服务之后的下一个增长点,而基于IP的融合有线网络和无线网络的语音服务则是全业务的重点之一。本文通过分析现有VoIP网络存在的问题以及固定移动融合网络环境下VoIP的特点,提出一种新型双层重叠网架构的P2PSIP架构,并阐述了新型架构的优点及双层重叠网之间的通信机制。新型架构能有效提高系统的安全性、健壮性和用户节点资源利用效率,更好的满足固定移动融合网络环境下VoIP对带宽、网络质量和安全性的要求。     

移动视频监控技术应用研究

本文从移动视频监控的体系架构入手,重点分析了业务模式、业务功能、移动网络数据传输能力、移动网络与传统视频网络的数据适配共4个业务发展的关键问题.最后,对业务的发展进行了展望.     

全球移动商务业务纵览（一）移动金融业务

近年来,移动商务服务在全球迅速兴起。许多国家都开始推出移动金融业务、移动购物、移动拍卖、移动广告、移动娱乐、移动远程信息处理和移动安全服务等业务。本文比较详尽地说明了这些业务在一些国家的开展情况,指出了存在的问题,并对未来几年的发展趋势作了展望。     

急救车车载信息服务的服务模式及实现架构

目前,急救医疗需求快速增长,急救系统信息化水平低,信息化标准有待完善。基于对急救医疗信息服务现状的分析,提出了以智能车管和远程诊疗为核心的急救车车载信息服务是未来的重要发展方向,探讨了急救车车载信息服务的内涵、实现架构、关键技术和服务模式。     

Research activities on next-generation mobile communications and services in Korea

In this article we present a perspective on next-generation mobile communications and services. As a preliminary research work on next-generation mobile communications, we exploit what next-generation mobile services will be (S. Ryu et al., May 2003). We define next-generation mobile services as a hierarchy of services consisting of three different service levels: the service areas, the service functionalities, and the service technologies. We derive these service levels by means of scenario-based analysis. Next we propose conceptual reference network architecture, focusing on the realization of the service technologies. We divide the network into four different parts: a user equipments and access part, a network service provisioning layer part, a network control layer part, and non-mobile network operator service pan, according to characteristics of information and service flows within a network. In this reference network architecture, service elements such as servers, processors, and gateways are placed in each network part to support the derived next-generation mobile services. Finally, we give a brief introduction of research and development activities for next-generation mobile communication systems and services in Korea.     

一种基于Viterbi算法的虚拟网络功能自适应部署方法

为了应对移动数据流量的爆炸性增长,5G移动通信网将引入新型的架构设计。软件定义网络和网络功能虚拟化是网络转型的关键技术,将驱动移动通信网络架构的创新,服务链虚拟网络功能的部署是网络虚拟化研究中亟待解决的问题。该文针对已有部署方法未考虑服务链中虚拟网络功能间顺序约束和移动业务特点的问题,提出一种基于Viterbi算法的虚拟网络功能自适应部署方法。该方法实时感知底层节点的资源变化并动态调整拓扑结构,采用隐马尔科夫模型描述满足资源约束的可用的底层网络节点拓扑信息,基于Viterbi算法在候选节点中选择时延最短的服务路径。实验表明,与其它的虚拟网络功能部署方法相比,该方法降低了服务链的服务处理时间,并提高了服务链的请求接受率和底层资源的成本效率。     

移动智能网中SCP的设计研究

给出了GSM（全球移动通信系统）和智能网结合的总体结构，指出了移动智能网中SCP（业务控制点）设计要解决的问题：（1）怎样与HLR（归属位置寄存器）进行通信以得到移动网中与移动有关的数据，（2）怎样解决智能业务与移动网中已有业务的交互．本文对这两个问题给出了解决办法．最后，为了让业务提供者设计与移动有关的业务，定义了三个与移动有关的新SIB（业务无关构件）     

部署LTE对3G网络规划的挑战

随着物联网和移动宽带时代的到来,移动数据业务呈现爆炸式增长,现有的移动网承载技术将很难满足未来数据业务需求,移动业务市场需求和竞争是LTE技术产生与发展的源动力。本文分析了LTE演进的必然性及目前的发展情况;并从频段使用、承载网、核心网等方面讨论了在引入LTE时,网络规划应重点处理好的问题。     

中间件及其在移动服务网中的应用

主要介绍中间件的种类、分布式体系结构、技术特点、工作机理及其应用。描述了中间件在优化移动服务网体系结构等方面的作用，重点阐述了移动服务网中几个子系统，如何采用中间件合理实现三层体系架构，探讨了采用中间件技术实现移动服务网扩展性的方式。     

永远在线方案研究

通过分析永远在线业务对移动网络带来的问题,创新性地从网络系统角度提出了一种移动网络对永远在线业务的服务机制.该机制基于策略及计费控制（PCC）架构,由永远在线业务服务器通知PCC系统对该永远在线业务流进行网络地址转换（NAT）保活及承载通道保活控制,以此实现移动网络对永远在线业务的承载通道及NAT资源的有效保证,降低永远在线业务对网络负荷的影响,从而提高网络的利用率.     

一种基于移动Agent的服务组合模型

在面向服务的架构中，为了实现根据用户需求，利用已有的服务构件组装新的服务，提出了基于主动网络和移动代理技术的服务组合模型，该模型将组合服务所需的基本服务封装成主动服务包SA（Senrice Agent）．通过SA的不同组合生成用户所需要的服务，并对服务组合过程中涉及的服务发现和服务选择算法进行了研究。     

Toward an all-IP-based UMTS system architecture

Looking into the future, two main drivers for the mobile telecommunications market can be identified: third-generation mobile systems (e.g., UMTS) and the Internet (e.g., the introduction of IP technologies like voice/multimedia over IP in mobile networks). UMTS is seen as the enabler of wireless multimedia applications and portability of a personalized service set across network/terminal boundaries, as defined within the virtual home environment (VHE) system concept. In light of these evolutions, this article investigates the impact of the evolution toward an all-IP UMTS network architecture on the UMTS service architecture, which is based on the VHE concept. The article discusses two possible scenarios for supporting VoIP services in the UMTS service architecture and analyzes their applicability in an all-IP-based UMTS network. The first is based on the traditional centralized IN service architecture. The second proposes a new decentralized architecture based on direct control of VoIP call control equipment by open service architecture interfaces     

Routing protocol development for quality of service optimization of video‐on‐demand system over mobile ad hoc networks

A video‐on‐demand (VoD) application system over mobile ad hoc networks typically requires particular quality of service (QoS) parameters to be achieved. In this paper, we have proposed a novel QoS‐based routing protocol called as mobile VoD protocol. This protocol has been developed for improving the QoS of the mobile VoD system (normal Mobi_VoD approach). The protocol uses customer caching scheme for storing the first fragment of the entire video in the mobile customers and thereafter broadcast them when the new mobile customers missed the portion of the already transmitted first fragment for reducing the service delay of the customer, consequently optimizing QoS parameters. Various scenarios have been studied, and the efficacy of simulation results proves that the proposed system architecture in which the mobile customers use an ad hoc network caching scheme (mobile VoD protocol) is more efficient and performs better than the existing system (ad hoc on‐demand distance vector protocol) when compared in terms of QoS parameters such as the end‐to‐end delay, energy consumption, packet delivery ratio, throughput, and overhead.     

MRSVP: A Resource Reservation Protocol for an Integrated Services Network with Mobile Hosts

This paper describes a reservation protocol to provide real-time services to mobile users in an Integrated Services Packet Network. Mobility of hosts has significant impact on the quality of service provided to a real-time application. The currently proposed network system architecture and mechanisms to provide real-time services to fixed hosts are inadequate to accommodate the mobile hosts which can frequently change their point of attachments to the fixed network. Mobile hosts may experience wide variations of quality of service due to mobility. To reduce the impacts of mobility on QoS guarantees, a mobile host needs to make advance resource reservations at multiple locations it may possibly visit during the lifetime of the connection. The currently proposed reservation protocol in the Internet, RSVP, is not adequate to make such reservations for mobile hosts. In this paper, we describe a new reservation protocol, MRSVP, for supporting integrated services in a network with mobile hosts.     

基于5G的警务集群系统

通过分析集群通信系统沿专网与公网方向发展演进的技术趋势,结合公安调度需求研究了基于5G切片的警务集群系统体系结构,包括应用层、服务层、传输层、终端层、标准及管理体系和安全保障体系。在网络组网架构方面,通过超高可靠低时延通信(Ultra-reliable and Low Latency Communications,uRLLC)切片传输控制信号,增强型移动宽带(Enhanced Mobile Broadband,eMBB)切片传输业务内容,并提出集群业务软件中通信调度业务逻辑、综合业务适配和维护管理软件的模块组成,对其应用的协同算法、时延保证、安全可靠性和可扩展性等关键技术问题给出建议。基于多智能体控制模型提出多接入边缘计算(Multiple Access Edge Computing,MEC)服务器之间状态同步协调算法,为警务集群系统在5G技术体制下的进一步发展提供了基础。     

A low latency service function chain with SR-I/OV in software defined networks

A network flow is required to be processed by multiple network functions such as PGW and SGW in mobile networks as a service function chain (SFC). Compared to hardware-based network functions, virtualized network functions are more flexible for deployment. Software defined network (SDN) provides a centralized network architecture to manage network resources and route the network flow among network functions in sequence and virtual machines are leveraged to deploy the network functions as network function virtualization (NFV). However, currently the performance of NFV suffers from I/O latency because packet processing causes lots of interrupts that decreases CPU utilization. To address the I/O latency issue, SR-I/OV network card is designed to replace OpenvSwitch in host machines to reduce the system interrupts. However, SR-I/OV is not compatible with existing SDN system, which is an important component in future 5G networks. Therefore, we propose an integrated architecture called the low latency service function chain from a wider perspective in system design to overcome main defects described above. We modify appropriate components in SR-I/OV driver and OpenvSwitch to dramatically reduce packet processing latency in SFC composed by several VNFs. Moreover, our design is compatible with SDN environment and benefited by central control.

     

传统语音交换网络面临的挑战及应对策略

电信运营商经营的语音业务不断被分流,原来构筑的精品交换网络必须进行演进,并积极展开面向未来业务发展需要的新架构研究,迎接移动互联网的挑战。文章从语音业务和网络现状出发,分析语音业务发展的特点和发展趋势,通过对语音业务需求和技术发展的综合分析,提出传统语音交换网络的发展策略。     

面向5G/B5G的智能云化网络架构

5G/B5G技术的出现使移动网络的带宽、时延、连接等关键能力得到了极大的提升。面对移动接入侧能力的飞速发展,现有的集中式互联网云服务架构容易出现瓶颈,无法充分发挥 5G/B5G 的性能优势。网络5.0技术的提出,旨在通过一套完整的创新协议体系及控制管理架构,应对未来典型网络应用对数据网络的需求。基于网络5.0协议体系,提出一种新型的智能云化网络,通过云网深度融合,弥补互联网服务模型与5G/B5G接入能力之间的差距,推动网络持续演进发展。