基于3GR4网络的多媒体彩铃方案

多媒体彩铃业务是移动运营商未来3G网络的一个重要增值业务.介绍基于3G R4网络的三种多媒体彩铃组网方案,并对三种方案进行了比较,得出终端支持二次协商的彩铃组网方案是最适合采用的组网方案.     

2G彩铃与3G R4彩铃混合组网方案

本文首先介绍了R4网络,然后分析了2G彩铃和3G R4彩铃的单独组网方案,最后对2G彩铃和3G R4彩铃混合组网进行了研究,并讨论了混合组网方案对彩铃平台性能的要求。     

彩铃业务的三种网络实现方式

介绍了目前移动通信彩铃业务的三种网络实现方式,即智能网方案、被叫交换机改造方案和主叫交换机改造方案,详细介绍了各种网络实现方式的网络结构、业务流程和对网元设备的改造要求,对各种网络实现方式进行了优缺点分析、对比并提出了建议。     

中兴通讯盛装登场精彩演绎戛纳3GSM全球年会

近日,全球通信产业瞩目的法国戛纳"3GSM World Congress"在法国南部风景如画的国际著名影城戛纳如期举行。 作为中国最大的通信制造业上市公司和全球无线通信的主流 设备供应商,中兴通讯以强大阵容、全面展示了其自主研发的 基于UMTSR4的3GWCMDA"一站式"商用解决方案、全球领 先的3G"运维工厂"网络建设方案、3Gcdma2000差异化解决方 案、3G全系列手机以及为全球运营商成功运营3G网络而量身 定制的赢利性解决方案等精彩内容。     

3G R4网络中传情酷秀业务与多媒体彩铃业务交互的研究

传情酷秀业务(3G cool show service)是3G网络可视通话过程中的一种新兴、个性化的视频业务。如何处理好传情酷秀业务与多媒体彩铃业务(multimedia ring back tone)的关系,成为传情酷秀业务发展的关键。本文介绍了传情酷秀业务在3GR4网络中的实现方案,并分析了其与多媒体彩铃业务冲突的原因,重点讨论了解决冲突的几种方法。     

彩铃业务与呼叫转移补充业务间的冲突解决

本文首先介绍了基于智能网方案下彩铃业务的信令流程和特征,然后按照呼叫转移补充业务的分类,结合彩铃业务的特点和性质,讨论了各类呼叫转移业务和彩铃业务之间存在的业务冲突,并给出了解决业务冲突的3种方案,最后再对3种方案进行了综合的比较和评价.     

信息窗

中兴通讯盛装登场精彩演绎嘎那3GSM全球年会 2005年2月14～17日,全球通信产业瞩目的法国嘎那“3GSMWorldCongress”在法国南部风景如画的国际著名影城嘎那如期举行。此次嘎那3G全球年会,中兴通讯以强大阵容、全面展示了其自主研发的基于UMTSR4的3GWCMDA“一站式”商用解决方案、全球领先的3G“运维工厂”网络建设方案、3GCDMA2000差异化解决方案、3G全系列手机以及为全球运营商成功运营3G网络而量身定制的赢利性解决方案等精彩内容。在新闻发布会上,中兴通讯副总裁方榕女士对来自全球的新闻媒体披露了中兴通讯的两个重大新闻…     

固网彩铃业务及其在徐州铁通的实现

彩铃业务目前已经成为固网运营商挖掘现有网络潜力、提高收入、拉抬日渐走低的ARPU值的法宝之一.固网彩铃业务的实现方案,现在基本上有话路迂回方案和无话路迂回方案两种.徐州铁通采用汇接局/SSP集中桥接话路迂回的方案,本地网通过对网络的优化、改造,集中触发、集中桥接的方式,实现了为全网用户提供彩铃业务的能力.     

移动网络主叫彩铃实现方案分析

文章介绍了主叫彩铃的定义,指出其与目前广泛应用的被叫彩铃之间的区别;并对电信运营商开展主叫彩铃业务的运营方案和技术实现方案做出详细的分析,主要包括:在主叫彩铃的不同运营模式以及不同触发方式下对现网各个系统的配合要求,并在对各种方案详细分析的基础上进行了对比,给出了选择主叫彩铃建设方案的建议.     

彩铃平台架构优化方案

随着网络向IP化方向的演进及彩铃业务的不断发展,彩铃平台架构的优化将是彩铃平台下一步演进的基础。文章先简要介绍现有彩铃平台的架构,再分析现有彩铃平台存在的问题,最后提出了彩铃平台架构如何进行优化的方案。     

A study of multicast congestion control for UMTS

In this paper, we study the applicability of multicast congestion control over universal mobile telecommunications system (UMTS) networks. We analyze two well‐known multicast congestion control schemes for fixed networks, namely TCP‐friendly multicast congestion control and pragmatic general multicast congestion control. We investigate their behavior when they are employed in UMTS networks and we analyze the problems arose when these mechanisms are applied over the wireless links of the UMTS terrestrial radio‐access network. Additionally, we propose necessary improvements to these legacy schemes and explain the necessity of these modifications. The proposed schemes are implemented in the ns‐2 network simulator and are evaluated under various network conditions and topologies. Finally, we measure the performance of the proposed modified schemes and compare them with the corresponding legacy mechanisms. Copyright © 2009 John Wiley & Sons, Ltd.     

The Universal Mobile Telecommunication System

The concepts, requirements, and technologies of Europe's third generation mobile communication system-the Universal Mobile Telecommunications System (UMTS)-are discussed. The cellular architecture, radio resource, adaptive resource allocation and handover enabling techniques for realizing an effective UMTS access network are described. The modulation schemes, multiple access methods, and duplexing methods used in the third generation mobile system's flexible radio interface are also described. The architecture, mobility support, and protocol development of the UMTS fixed network are outlined     

UMTS网络商业楼宇无线覆盖方案分析

无线网络覆盖是网络规划工作中的难点和重点,不同的覆盖策略会导致截然不同的网络投资、覆盖效果、工程难度和网络质量,UMTS网络规划也不例外,必须在合理的网络覆盖策略指导下进行.就典型商业楼宇的无线网络覆盖方案进行了分析和探讨,提出了室内覆盖系统的三种方案.     

Hybrid coupling scheme for UMTS and wireless LAN interworking

We propose a hybrid coupling scheme to support interworking between UMTS and WLAN networks. Under the Tight-coupled system, it is expected that WLAN users can also use UMTS services with guaranteed QoS and seamless mobility. However, the interworking is problematic. The capacity of UMTS core network nodes cannot accommodate the bulky data traffic from WLAN, since the core network nodes are designed to handle the small-sized data of circuit voice calls or short packets. The proposed coupling scheme differentiates the data paths according to the type of the traffic and can accommodate traffic from WLAN efficiently, with guaranteed QoS and seamless mobility. We compare the handover procedures of the proposed coupling strategy with those of the loose and tight coupled schemes. In addition, we analyze the delay based on signaling costs during vertical handover. It is shown that the handover latency decreases when the UMTS and WLAN are coupled in the proposed way.     

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。     

OVSF code channel assignment with dynamic code set and buffering adjustment for UMTS

The Universal Mobile Telecommunications System (UMTS) provides users variable data rate services, which adopts wide-band code-division multiple-access (WCDMA) as the radio access technology. In WCDMA, orthogonal variable spreading factor (OVSF) codes are assigned to different users to preserve the orthogonality between users' physical channels. The data rate supported by an OVSF code depends on its spreading factor (SF). An OVSF code with smaller SF can support higher data rate services than that with larger SFs. Randomly assigning the OVSF code with a large SF to a user may preclude a larger number of OVSF codes with small SFs, which may cause lots of high data rate call requests to be blocked. Therefore the OVSF code assignment affects the performance of the UMTS network significantly. In this paper, we propose two OVSF code assignment schemes CADPB1 and CADPB2 for UMTS. Both schemes are simple and with low system overhead. The simulation experiments are conducted to evaluate the performances for our schemes. Our study indicates that our proposed schemes outperform previously proposed schemes in terms of the weighted blocking probability and fairness index. Our schemes improve the call acceptance rate by slightly introducing call waiting time.     

An architectural framework for seamless handoff between IEEE 802.11 and UMTS networks

In recent years, Cellular wireless technologies like GPRS, UMTS, CDMA and Wireless Local Area Network (WLAN) technologies like IEEE 802.11 have seen a quantum leap in their growth. Cellular technologies can provide data services over a wide area, but with lower data rates. WLAN technologies offer higher data rates, but over smaller areas, popularly known as ‘Hot Spots’. The demand for an ubiquitous data service can be fulfilled, if it is possible for the end-user to seamlessly roam between these heterogeneous technologies. In this paper, a novel framework is proposed consisting of intra-ISP network called ‘Intermediate Switching Network’(ISN) fused between UMTS and WLAN networks as well as data (Internet) services for providing seamless mobility without affecting user’s activities. The ISN uses MPLS and Multiprotocol-BGP to switch the data traffic between UMTS to IEEE 802.11 networks, as per the movements of the user. The ISN is integrated with the UMTS network at the GGSN-3G and at the Access Point for IEEE 802.11 network respectively. The simulation result shows the improved performance of the ISN based framework over existing schemes.     

超远距离场景覆盖分析

超远距离覆盖是移动网络规划与设计的一个难点,本文介绍了超远距离场景的特点,分析了UMTS最大通信距离和海面传播模型,详述了各种超远距离覆盖技术。     

A novel location management scheme for cellular overlay networks

In Beyond Third Generation (B3G) wireless communications, multiple overlays of wireless access networks may cooperate to allow a user access to novel services, the future demands of which will significantly increase the load on location management systems within the networks. In this paper, we introduce the reader to our novel proposals for providing efficient Mobile Terminal (MT) Location Discovery and Paging across an inter-worked network consisting a Digital Video Broadcast (DVB) network and Universal Mobile Telecommunication System (UMTS) network. We further present numerical and simulation analyzes of our scheme. The numerical and simulation results allow broadcast and cellular network operators to configure their inter-worked system to reduce location management and paging costs whilst controlling average latency. Our results demonstrate that our UMTS LA plus DVB paging schemes offer promise for efficient MT discovery in an inter-network environment that includes uni-directional broadcast network such as DVB; under realistic scenarios we achieve a minimum 4 times reduction in paging cost across the inter-network compared with independent paging systems. Furthermore, we briefly introduce further aspects of research that must be addressed in order to fully evaluate our proposals.     

浅谈IMS和PSTN/CS网络的互通

IP多媒体子系统自从3GPP UMTS Release5后已经被加入到通用移动通信系统(UMTS)的核心网络中.现在,UMTS网络主要包含以下3个域:电路交换(CS)、分组交换(PS)和IP多媒体子系统(IMS).IMS需要同原有相对陈旧的网络电路交换(CS)网络及公用电话交换网(PSTN).本文主要针对IMS同PSTN/CS网络的互通进行了概述.