3G时代的计费

与2.5G相比，3G将为用户提供更为灵活、多样化、个性化的业务。3G业务的特点决定了3G网络应能够对其所支持的多种复杂数据业务进行有效及时的计费。本文在介绍3G业务的基础上，分析3G计费的需求，给出3G计费的原理，并对未来的3G计费进行展望。     

GPRS在远程监控模型中的应用

首先简述了GPRS的主要特点、网络总体结构、逻辑体系结构及一些应用业务。在此基础上,介绍了基于GPRS的远程监控系统模型。最后结合应用实例详细阐述了此监控模型的机制、优点和系统中存在的不足。     

GPRS与Mobile IP的互通策略

本文讨论一种在GPRS上实现对MobileIP支持的方法，并简单分析了演进策略。     

蓝牙PAN到GPRS的接入

本文主要讨论了蓝牙PAN 的基本概念以及现今蓝牙接入GPRS所采用的方式和过程.     

vGPRS: A Mechanism for Voice over GPRS

This paper proposes vGPRS, a voice over IP (VoIP) mechanism for general packet radio service (GPRS) network. In this approach, a new network element called VoIP mobile switching center (VMSC) is introduced to replace standard GSM MSC. Both standard GSM and GPRS mobile stations can be used to receive real-time VoIP service, which need not be equipped with the VoIP (i.e., H.323) terminal capabilities. The vGPRS approach is implemented using standard H.323, GPRS, and GSM protocols. Thus, existing GPRS and H.323 network elements are not modified. Furthermore, the message flows for vGPRS registration, call origination, call release and call termination procedures are described to show the feasibility of our vGPRS system.     

An Improved GGSN Failure Restoration Mechanism for UMTS

Universal mobile telecommunications system (UMTS) provides packet-switched data services for mobile users. To efficiently deliver packets in the UMTS core network, the PDP contexts (i.e., the routing information) are maintained in the volatile storage (e.g., memory) of SGSN, GGSN, and UE. The GGSN routes packets between the UMTS core network and external data networks, and thus has heavy traffic and computation loading, which may result in PDP contexts lost or corrupted, and the QoS of the UMTS network may degrade significantly. To resolve this issue, 3GPP 23.007 proposes a mechanism for GGSN failure restoration. In this mechanism, the corrupted PDP contexts can be restored through the PDP Context Activation procedure. However, this incurs extra signaling cost to the network. To reduce the network signaling cost and delay for restoration of the corrupted PDP contexts, this paper proposes an improved mechanism “GGSN Failure Restoration” (GFR) with different backup algorithms. The analytic models and simulation experiments are conducted to evaluate GFR.Our study indicates that the GFR mechanism can significantly reduce the cost for the PDP context restoration. Phone Lin (M'02) received his BSCSIE degree and Ph.D. degree from National Chiao Tung University, Taiwan, R.O.C. in 1996 and 2001, respectively. From August 2001 to July 2004, he was an Assistant Professor in Department of Computer Science and Information Engineering (CSIE), National Taiwan University, R.O.C. Since August 2004, he has been an Associate Professor in Department of Computer Science and Information Engineering (CSIE), National Taiwan University, R.O.C. His current research interests include personal communications services, wireless Internet, and performance modeling. Dr. Lin is a Guest Editor for IEEE Wireless Communications special issue on Mobility and Resource Management. He is also an Associate Editorial Member for the WCMC Journal. Guan-Hua Tu received his B.S.C.S.I.E degree from National Central University, Taiwan, R.O.C., in 2001 and his Master degree in Computer Science from National Taiwan University, Taiwan, R.O.C., in 2003. He is currently a software engineer in MediaTek Inc. His resarch interests include personal communication services, mobile computing, and performance modeling.     

GPRS网络GTP协议解析方法研究

GPRS是GSM向3G迈进的一个重要步骤。文章以NGN网络测试仪的信令分析功能作为研究背景，介绍了GPRS骨干网中GPRS隧道协议功能和消息结构，并且在此基础上着重探讨了GTP解析方法，目的是对网络测试仪中GTP模块的软件实现提出解决方案。GTP协议的分析思路和方法对研究传输层的其他协议具有指导和推广意义。     

无线数传(APN)业务实现及故障排查方案

随着无线互联网时代的到来,基于无线网络的数据传输业务越来越多地运用到各行各业,如何运用先进的无线网络实现定向的安全的数据传输成为关注的焦点。文章就无线数传业务的实现及故障排查进行了分析探讨,提出了有效的解决方案。     

3G分组域核心网设备性能评估研究

由于无线带宽的增加,在3G网络中可以实现更多的数据业务,这些数据业务的逐渐引入将会对分组域核心网设备产生更多的性能压力;另外,业务种类的增多以及业务部署的周期逐渐缩短也会导致话务模型的复杂度和时变性增大,对设备在不同情况下的性能表现提出了新的挑战.这些都要求对3G分组域核心网设备进行科学的评估,以推动设备性能的优化,最大程度地保障网络和业务质量.本文对3G分组域核心网设备的性能评估方法做了系统的描述,并结合实际测试中发现的问题,对今后工作提出了参考建议.     

GPRS核心网设备的2G/TD融合组网方案

文章首先介绍7GPRS核心网技术的发展,然后从GPRS核心网设备网络结构现状入手提出73G时代2G/TD融合组网的改造原则,分析了2G／TD融合组网的改造方案。