2G／3G互操作方案思考

文章介绍了中国联通2G网元进行2G／3G互操作的功能需求描述,使现有的GSM／GPRS网设备具备2G／3G互操作功能,从而保证3G用户在GSM／GPRS网和WCDMA网中的业务使用连续性。     

3G可视电话业务网间互通探讨

探讨了国内电信运营企业3G可视电话业务的网间互通架构,介绍了WCDMA/TD-SCDMA系统网间互联互通测试方案。     

2G／3G共用室内分布系统的设计

首先介绍了室内分布系统的结构及2G／3G共用室内分布系统的方式，随后对2G／3G共用室内分布系统的关键问题进行了分析。     

基于3G-324M和SIP的3G可视电话互通研究

可视电话业务对网络带宽、时延抖动和丢包率都有较高的要求。中国目前的第三代移动通信技术（3G）网络制式使用不同的无线技术,这使得3G网络中可视电话业务在实现的技术方式上也不同。此处主要研究3G网络中基于3G-324M和SIP协议为基础的电路域和分组域可视电话的实现技术,包括控制协议和呼叫流程。同时针对各自不同的实现方式探讨互通的具体形式,在深入分析可视电话互通理论的基础上设计了互通网关的结构,这对于实现不同制式下的可视电话业务互通具有重要的参考价值。     

2G/3G互操作网络优化原则与策略

在进行TD-SCDMA网络建设时,利用现网资源和用户资源,实现网络以及用户体验的平滑过渡。2G/3G互操作主要解决混合组网过程中碰到的网络驻留、小区选择、小区重选、切换以及用户接入控制和转网策略等问题。     

A Unified Architecture and Key Techniques for Interworking between WiMAX and Beyond 3G/4G Systems

The trend of inter-connection among a multitude of different wireless access networks presents the great and bright potential business opportunities for communication operators. However, such a trend also creates a huge challenge for the network designers to manage the different radio access technologies in a cooperative mode. Therefore, this paper proposes two advanced functional architectures to support the functionalities of interworking between WiMAX and beyond 3G/4G systems, i.e., Radio Control Server (RCS) and Access Point (AP) based centralized architectures. Both control and user planes are defined in these two architectures. This paper further describes the corresponding key techniques for the interworking. These techniques can be partitioned into four categories: the key mechanisms in Generic Link Layer (GLL), the key mechanisms in Multi-Radio Resource Management (MRRM), the end-to-end Quality of Service (QoS) provision, and the heterogeneous paging. For the mechanisms in GLL, Multi-radio transmission diversity (MRTD) and Multi-Radio Multi-Hop networking (MRMH) schemes are researched. Meanwhile, Radio Access Technology (RAT) selection and load balancing schemes in aspect of MRRM are presented to improve the performance of interworking. In particular, the heterogeneous paging procedures for the convergence of WiMAX and beyond 3G/4G are proposed and evaluated, which can decrease the transmission load and save the power consumption.

2G/3G网络漫游解决方案探讨

首先简要介绍了2G/3G网络漫游产生的背景,在此基础上对未来2G/3G网络漫游实现方案进行了分析和探讨,并对两种漫游解决方案下典型的3G智能网漫游用户呼叫流程进行了详细的分析和论述。     

2G／3G互操作参数优化研究

针对TD—SCDMA、GSM融合网络因参数设置不合理造成的影响用户感知问题,本文提出了一系列2G／3G互操作参数优化方法：系统间切换等待定时器优化、切换失败惩罚最大次数和切换失败惩罚时间优化、PS域切换门限优化、3G-2G切换／重选参数与2G-3G重选参数联合优化等方法,通过以上方法的应用提升了2G／3G互操作性能,实现了2G／3G网络资源的合理利用,提升了用户感知。     

GSM900／1800M双频网建设及与3G网络协调发展

分析GSM900M／1800M频率资源,探讨了900M网络可承载的话务容量负荷,双频网的建设门限、组网方式分析、双频网建设策略以及2G／3G网络协调发展等。     

四网协同场景下的核心网互操作方案

本文以四网协同组网场景下的互操作方案为切入点,通过核心网的深度融合,从实际业务连续性保障的需求出发,探讨分析了终端在2G/3G/LTE和WLAN之间的无缝漫游及互操作流程,实现业务连续性体验,往四网协同发展的目标演进.     

2G／3G互操作策略的实施

本文简单论述T2G／3G互操作的必要性。在对2G／3G互操作策略及其相关通信原理做出介绍的同时,重点描述了中国移动针对现阶段TD—SCDMA发展初期所采取的2G／3G互操作策略及实施方式。     

上海贝尔2G／3G互操作解决方案

分别从互操作策略选择、有效的无线网络移动性管理功能和优化经验与合理的参数设置等3个方面讨论了如何定位2G／3G网络相互关系,协调互操作,完善用户的移动性,提高设备网络利用率,保证良好的用户体验。并简要介绍了上海贝尔在2G／3G互操作方面的一些想法和建议以及产品功能特点和优势。     

MCIP: A 3G/IP Interworking System Supporting Inter-Cluster Soft Handoff

In this paper, a novel 3-tier Mobile Cellular IP (MCIP) access network is proposed for interworking between a third generation (3G) wireless cellular system and a wireline Internet Protocol (IP) based network. An inter-cluster hard handoff scheme and an inter-cluster soft handoff scheme are proposed, based on the 3-tier MCIP system model, the core network protocol stacks, and the underlying MCIP routing algorithm. The core network protocol stack is presented to integrate the 3G radio interface and the IP-based core network, and to provide the access network with capability to support soft handoff macroscopic space diversity. The MCIP hard and soft handoff schemes are compared with the hard handoff schemes used in the Cellular IP and HAWAII access networks. The MCIP access network is more efficient in terms of signaling cost, but has the same scalability as Cellular IP and HAWAII. Both MCIP hard and soft handoff schemes enable IP packets to be delivered within the MCIP access network in-order without loss and duplication, a highly desired attribute for real-time multimedia applications. The advantages of supporting soft handoffs and quality-of-service (QoS) provisioning for real-time services are achieved at slightly increased system complexity.This work was supported by a research grant from the Natural Science and Engineering Research Council (NSERC) of Canada. The authors wish to thank the anonymous reviewers for their helpful comments and suggestions which improve the presentation of this paper. Xin Liu received his B.E. and M.E. degrees in radio engineering from Harbin Institute of Technology (China), in 1990 and 1993, respectively, and his M.A.Sc degree in electrical engineering from the University of Waterloo in 2002. He joined Research In Motion in 2002 as a firmware developer. His current work involves GSM/GPRS and WCDMA firmware development. Weihua Zhuang received the B.Sc. and M.Sc. degrees from Dalian Maritime University (China) and the Ph.D. degree from the University of New Brunswick (Canada), all in electrical engineering. Since October 1993, she has been with the Department of Electrical and Computer Engineering, University of Waterloo, Canada, where she is a full professor. She is a co-author of the textbook Wireless Communications and Networking (Prentice Hall, 2003). Her current research interests include multimedia wireless communications, wireless networks, and radio positioning. Dr. Zhuang received the Premier's Research Excellence Award (PREA) in 2001 from the Ontario Government for demonstrated excellence of scientific and academic contributions. She is an Editor of IEEE Transactions on Wireless Communications, an Associate Editor of IEEE Transactions on Vehicular Technology, and an Editor of EURASIP Journal on Wireless Communications and Networking.     

针对iPhone终端的2G/3G互操作优化方法研究

基于现网实际数据,对iPhone终端性能和2G/3G互操作特性进行了深入分析,在此基础上提出了iPhone在2G/3G互操作问题上的优化方案,并通过现网测试进行了验证。     

2G与3G混合组网策略研究

WCDMA技术是3G标准系列家族中三大主流标准之一,能够实现GSM网络的平滑过渡.本文从WCDMA基站和GSM基站之间的互干扰、链路预算以及容量方面分析了WCDMA基站和GSM基站共站的可行性.另一方面,考虑到WCDMA无线网络与GSM的不同及其特点,对混合组网的策略进行研究.     

分场景2G／3G互操作与功率参数优化

互操作优化目标就是把2G／3G网络有效结合起来,针对现网具体情况,我们将全网小区按照覆盖场景不同进行划分,对不同厂商设备规定统一标准的互操作参数及功率参数,从而保证2G／3G互操作的规范性、准确性,同时提升优化工作效率。实践证明,经过分场景2G／3G互操作与功率参数优化后,切换成功率、掉话率等指标有较大提高,客户感知也得到提升。     

2G／3G互操作参数优化

本文依据提升TD—SCDMA网络中2G／3G呼叫占比的经验，探讨如何在保障用户感知的情况下，让用户更多的驻留在TD—SCDMA网络，提高TD-SCDMA网络承载能力，缓解GSM网络话务量压力，梳理2G／3G呼叫占比提升的一般方法和流程，为今后的2G／3G呼叫占比提升提供参考。     

2G/3G互操作参数研究及初期网络设置建议

主要探讨了WCDMA与GSM共同组网时所面临的两网间互操作的问题,并重点对互操作的流程及参数设置进行了介绍。希望能对3G初期网络建设提供一些有价值的参考。     

基于终端及业务贡献度分析的2G/3G协同评估流程研究

提出一套2G/3G协同评估流程,基于2G高负荷区域业务贡献度分析,区分市场线以及优化线2套协同分析方法及策略,并通过分析2G网络3G用户贡献以及3G用户终端类型,最终明确2G/3G网络协同现状,以此为参考给出相应策略建议。     

Performance Study for Two-Tier CDMA Cellular Systems with Multi-Channel Access

The CDMA cellular system can provide more capacity than AMPS systems and the hierarchical layer of cells is required for system design. However, system performance and capacity is degraded due to the cochannel interference between microcell and macrocell if a single frequency channel is shared. This paper proposes three multi-channel access schemes where various frequency channels are assigned for microcell and macrocell. Performances of channel capacity, blocking probability and blocking ratio in uplink and downlink are evaluated. Due to channel segregation and thus the cochannel interference among macrocell and microcell are minimized, the proposed scheme 3 where all channels are accessible sequentially in macrocell and microcell performs the best in system capacity and blocking probability than the other schemes.