移动核心网语音IP化以适应未来3G、IMS格局的几点分析

目前移动核心网规划、建设以软交换技术为核心,将业务与信令控制分开,基于IP承载的面向3G、IMS的软交换核心网,实现既支持2G网络,又能适应未来3G网络的思路已为业界所公认.在移动核心网软交换化以适应未来3G、IMS格局进程中,语音IP化即IP承载网承载语音是非常重要的一环.本文以陕西移动为例就移动核心网软交换化进程中语音IP化阶段的特点,作几点分析.……     

移动核心网语音IP化以适应未来3G、IMS格局的几点分析

目前移动核心网规划、建设以软交换技术为核心,将业务与信令控制分开,基于IP承载的面向3G、IMS的软交换核心网,实现既支持2G网络,又能适应未来3G网络的思路已为业界所公认。在移动核心网软交换化以适应未来3G、IMS格局进程中,语音IP化即IP承载网承载语音是非常重要的一环。本文以陕西移动为例就移动核心网软交换化进程中语音IP化阶段的特点,作几点分析。     

移动核心网语音IP化以适应未来3G、IMS格局的几点分析

目前移动核心网规划、建设以软交换技术为核心，将业务与信令控制分开，基于IP承载的面向3G、IMS的软交换核心网，实现既支持2G网络，又能适应未来3G网络的思路已为业界所公认。在移动核心网软交换化以适应未来3G、IMS格局进程中，语音IP化即IP承载网承载语音是非常重要的一环。本文以陕西移动为例就移动核心网软交换化进程中语音IP化阶段的特点，作几点分析。     

对发展3G和移动宽带无线接入技术的思考

固网运营商利用已经有的宽带IP网采用IEEE 802.1 6d等宽带无线接入技术从固定向移动接入演化是明智的选择,移动运营商为发挥已经有资源的效益沿3G路线演化是必然选择,但从发展的角度看移动宽带无线接入采用无连接的分组统计复用,核心网全IP化是大势所趋.文章在介绍IEEE 802.1 6d/e、CDMA2000 1 x EV-DV的基础上,探讨了移动宽带无线接入技术的发展趋势,指出目前3G无线链路向分组化演化的基本技术和IEEE 802.1 6d/e是相同的,最终将殊途同归.文章强调指出中国的TD-SCDMA应尽快向无连接的分组统计复用方向演化.     

VoLTE在移动4G网络中的实际应用

VoLTE即Voice over LTE,它是一种IP数据传输技术,无需2G/3G网,全部业务承载于4G网络上,可实现数据与语音业务在同一网络下的统一。VoLTE是基于IMS的语音业务。IMS由于支持多种接入和丰富的多媒体业务,成为全IP时代的核心网标准架构。     

基于TCP/IP参数的WCDMA网络FTP速率提升优化策略研究

FTP速率优化涵盖无线优化、传输优化及应用层参数优化等方面。传统的FTP优化主要基于无线优化和传输优化,未涉及用户应用层的优化。本文在现有FTP优化方法基础上,以TCP/IP协议为基础,针对FTP业务信令流程特征及TCP/IP重要参数研究,结合3G无线接入网络信令特征,提出具有指导意义的TCP/IP参数设置规范,对提高现网FTP下载速率及大流量业务应用(如手机流媒体等)具有一定的推广价值。     

固网NGN向IMS平滑演进分析

1引言 网络全IP化、融合组网已逐渐成为移动核心网发展的主要方向。IP化是核心网演进的必然趋势,核心网从封闭的、基于电路交换的网络向开放的、基于Ip技术的统一承载网络转变;同定和移动多接入融合的语音通信对移动核心网提出了更高要求,     

利用CDMA2000 Alp接口实现IP基站的接入

移动运营商为发挥已经有资源的效益而沿3G路线演化是必然选择,从发展的角度看3G应用,不论是语音、数据还是多媒体的承载方式,核心网全IP化是大势所趋.以CDMA2000为例,应用3GPP2的最新A接口标准,提出一种基于IP基站进行接入的一种实现方案,并就相关问题进行讨论.     

移动核心网转型以适应未来3G、IMS格局的几点分析

随着3G的日益临近，如何改造目前的2G移动核心网，使其既能支持现有的2G网络，又能适应未来3G网络的发展，已成为当今移动核心网络规划、建设必须考虑的问题之一。为了突破现有移动核心网设备的性能瓶颈，支持移动核心网向下一代移动网络（面向IMS）的演进，业界提出了基于IP的、兼容2G／3G、面向IMS的移动软交换核心网建设思路：即建设以软交换技术为核心，将业务承载与信令控制分开，基于IP承载的面向3G、IMS的软交换核心网。这种核心网既支持现有2G网络，又支持未来的3G网络，还支持TDM／IP混合组网。本文以陕西移动为例就移动核心网如何转型以适应未来3G、IMS格局，作几点分析。     

B3G研究进入实质期各国论坛表现活跃

尽管3G在中国还未走上实际应用之路,但业界对3G之后移动通信的设想一直没有间断过:汇集了蜂窝、固定无线接入、游牧、无线区域网络等接入系统的未来移动通信系统,将结合全IP网络,在高速和低速移动环境下分别为用户提供峰值速率达100Mbit/s及1Gbit/s的无线传输能力,并实现蜂窝系统、区域性无线网络、广播、电视卫星通信的无缝衔接,使人类实现"任何人在任何时间、任何地点与其他任何人实现任何方式的通信".     

Development of Mobile Communications Systems Beyond Third Generation

Second generation mobile radio systems have been successfully deployed worldwide. These systems are evolved to higher data rates and packet transmission. Third generation mobile radio systems will be initially deployed in 2001 and 2002 in different regions of the world. Advanced multimedia services are under development and first services are already being offered in second generation systems. Due to the megatrend of the rapid growth of Internet type services packet oriented traffic is exceeding circuit switched traffic. Therefore, communication systems will be developed and optimized for packed oriented traffic. This paper presents a vision of a system beyond third generation mobile communications, which comprises a combination of several optimized access systems on a common IP based medium access and core network platform. These different access systems will interwork by horizontal and vertical handover, service negotiation and global roaming. The different access systems are allocated to different mutually complementing cell layers with respect to cell size, coverage and mobility to provide globally optimized seamless services to users.     

多用户远程语音交互终端接入设备设计与实现

基于低空飞行航空管制组网话音通信应用背景,从音频接口、模数/数模转换接口和网络接口3个核心处理模块出发,研究了网络化语音接入设备的硬件关键技术。从C语言级和汇编级两方面对G.729A语音编解码算法进行改进优化,并给出了语音数据的处理流程,以单片TMS320C6455DSP实时实现了语音4路压缩编码和20路解码处理。采用TCP/IP网络协议实现了多路语音网络通信功能,分析了多路语音串扰问题并设计了相应的解决方案。测试表明,基于该技术实现的设备语音处理延迟小于10 ms,满足多用户语音实时传输要求。     

Opportunities for IP in Communications Beyond 3G

Future communication will be based on TCP/IP as common network and transport layers to provide global connectivity to users and applications. IP is used to provide ubiquitous access across different access networks and exploits the benefits of a common connectivity layer while reducing the cost of operation and maintenance of the network. This paper discusses the opportunities for IP in the evolution towards a future broadband, all-IP mobile communication network. In particular, we argue for three opportunities for the future: Interworking access technologies over IP, IP layer transparency, and the ability to manage complexity.Thomas Toftegaard Nielsen was born on September 26th 1970 in Århus, Denmark. He holds a M.Sc.E.E. (‘95) and a Ph.D. (‘99) degree in mobile radio communications from Aalborg University, Center for PersonKommunikation, Denmark. In 1996, he joined the Danish mobile operator Sonofon, where he was involved in capacity and performance evaluations and enhancements of the frequency hopping GSM BSS system as well as advanced wireless network planning. In 1999 he was appointed senior radio project manager, where he became technically responsible for the GPRS mobile data dimensioning/planning. In 2000 he joined Ericsson Telebit A/S as wireless IP software development manager. Currently he is responsible for Ericsson’s IPv6/IPv4 termination dual-stack used in the Ericsson 2G, 2.5G and 3G terminal platforms, in parts of the Ericsson 2G and 3G access network as well as in the Ericsson MSC and MGW of the 3G core network.Rune Hylsberg Jacobsen was born in Copenhagen, Denmark, on October 12th, 1970. He holds a M.Sc. degree in physics and chemistry (1995) and a Ph.D. degree in physics (1997) from University of Aarhus. In 1996 he guested Bell Laboratories, Lucent Technologies, USA. During this period he conducted research in optoelectronic, terahertz-bandwidth radiation applied to material characterization. In 1997 he joined the R&D unit of the Danish telecommunication operator TDC where he worked on fixed broadband access, with emphasis on ADSL deployment and the characterization of transmission properties of the local loop. In 1999 he joined Ericsson Telebit A/S and started to work on European research projects in the 4th and 5th EU framework programs. He was appointed department manager for a software development unit in year 2000. In this position he was in charge of an IP router development for the radio access network and has since worked with aspects of using IP for wireless communication systems.     

我国移动通信网从第二代到第三代的演进策略

随着第三代移动通信标准的日趋成熟,其产品预计可在2004年前后投入商用。本文在分析市场需求、技术发展现状和保护已有设备投资的基础上,从保证我国移动通信产业、运营商和移动用户利益出发提出：第一步,在IMT－2000核心网成熟之前,采用现有的GSM／GPRS核心网,通过A和Gb接口提供话音和数据业务;空中接口采用频谱利用率高、符合IMT2000要求的TD－SCDMA技术,以满足高话务量区域的需求。第二步,采用成熟的IMT-2000核心网（Release2000)、IMT2000FDD和TD－SCDMA无线传输技术,逐步形成第三代移动通信系统。     

利用CDMA2000 A1p接口实现IP基站的接入

移动运营商为发挥已经有资源的效益而沿3G路线演化是必然选择，从发展的角度看3G应用，不论是语音、数据还是多媒体的承载方式，核心网全IP化是大势所趋。以CDMA2000为例，应用3GPP2的最新A接口标准，提出一种基于IP基站进行接入的一种实现方案，并就相关问题进行讨论。     

Evaluation of header compression schemes for IP-based wireless access systems

For mobile IP-based telephony (voice over IP) and IP-based real-time multimedia over cellular radio systems, an economically viable solution is needed. It is an absolute requirement that, for example, the 60-octet IPv6/UPD/RTP headers on IP telephony packets be reduced in size to conserve bandwidth in the radio spectrum. We evaluate the performance of two header compression schemes, based on RFCs 2508 and 3095, under the conditions of cellular radio access technology. The results presented in this article refer to voice and Web browsing traffic and are based on the implementation of compression/decompression algorithms for the aforementioned standards. We find that RFC 3095 performs significantly better if used for mobile communications.     

Key concepts for evolution toward beyond 3G networks

Now, when the first commercial 3G services based on Third Generation Partnership Project (3GPP) specifications have been launched around the world, is the right time to start considering the evolution potential of 3G systems. It is assumed that the majority of the traffic in future mobile networks will be generated by content consumption related services, which are realized with IP technologies. Thus, it is necessary to optimize the cellular networks for carrying IP traffic as efficiently as possible. We describe an evolution scenario for the 3G network architecture specified by 3GPP. The IP delivery part of the network architecture is first optimized within each subsystem, while maintaining interoperability with the legacy network. Later, the network is streamlined as a whole to provide the most efficient solution. We show how graceful evolution of the 3GPP system can benefit from possibilities of the new technologies, especially IP-based transport, while maintaining compatibility with existing user equipment and capitalizing on existing infrastructure investments.     

Research on the access network and MAC technique for beyond 3G systems

Based on the requirements of beyond 3G mobile communication systems, the access network architecture and media access control technique for B3G systems are studied. The proposed novel access network architecture, which can reduce network complexity and improve system performance, is introduced. Centralized mini-slot packet reservation multiple access (CMPRMA), based on OFDMA, is proposed, which not only can inherit the advantages of MPRMA and support real-time traffic well, but can also supply the resource reservation scheme for data traffic and support transmission for data traffic efficiently     

未来中国4G开放移动通信终端和网络接入架构

This paper relates to an advanced open mobile communication system and method of integrating the mobile communications, wireless access systems and wired communications into one common platform architecture for China＇s 4th generation mobile communications, supporting costeffective broadband voice, data and video services in wireless, mobile and wired environment with one single integrated mobile terminal device. The paper includes new architecture in the integrated mobile device and converged network access, and minimum modification in the existing mobile telecommunication infrastructures. This paper introduces the long-term evolution strategy for China＇s TDD system platform towards China＇s future 4G mobile communications.     

Performance analysis of the Cellular IP mobility protocol

The search for a suitable micromobility protocol which will inter-work with Mobile IP in 3G mobile networks has been the subject of intense research. Several proposals have been analyzed and comparisons carried out [1]. Cellular IP is a strong contender to take the seat as the chosen micromobility protocol, and its performance has been characterized mainly with Columbia IP Micromobility Software (CIPMS) under diverse scenarios. Previous analyses have considered generic TCP and UDP traffic. In the work presented here, a Cellular IP based 3G network model is developed, and services (voice, and web) are represented after probabilistic behaviors to conform, respectively, to a GSM coder, and web content comprised of packets, objects, and pages. In this way a more accurate knowledge of Cellular IP performance can be obtained.