GPRS：通往第三代移动网络的门户

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"GPRS: Gateway to Third Generation Mobile Networks" 是一本由Gunnar Heine和Holger Sagkob合著的专业书籍，属于Artech House Mobile Communications Series系列。该书详细探讨了GPRS（General Packet Radio Service）在连接第二代（2G）移动网络与第三代（3G）移动网络中的作用。 GPRS是2G网络向3G演进的关键技术，它为移动通信系统引入了分组数据传输的能力，从而提供了比传统电路交换方式更高效的数据服务。GPRS允许用户在移动状态下进行互联网连接，支持持续在线和按数据量计费，为移动互联网的发展奠定了基础。书中可能涵盖了以下几个核心知识点： 1. **GPRS原理**：解释了GPRS如何利用现有的GSM（Global System for Mobile Communications）网络基础设施，通过时隙分配机制来实现分组数据传输，提高频谱效率。 2. **GPRS网络架构**：详细介绍了GPRS网络中的各个组成部分，如SGSN（ Serving GPRS Support Node）、GGSN（Gateway GPRS Support Node）以及DNS（Domain Name Server）等，以及它们在数据传输中的角色。 3. **3G网络演进**：讨论了GPRS作为2G到3G过渡技术的角色，以及如何与UMTS（Universal Mobile Telecommunications System）和后来的HSPA（High-Speed Packet Access）等3G技术无缝对接。 4. **服务质量（QoS）管理**：探讨了GPRS如何支持不同层次的服务质量，如延迟、吞吐量和数据包丢失率，以满足不同业务需求。 5. **移动IP和会话管理**：解释了GPRS如何支持移动IP，使得用户在移动过程中保持网络连接，并介绍了会话建立和终止的流程。 6. **安全机制**：阐述了GPRS网络中采用的安全措施，如鉴权、加密和防止非法接入，确保数据传输的安全性。 7. **应用和案例研究**：可能包含实际应用示例，如MMS（Multimedia Messaging Service）、移动互联网浏览和企业级应用，以及实施GPRS网络时面临的挑战和解决方案。 8. **标准和规范**：提及了相关的国际标准组织如3GPP（3rd Generation Partnership Project），以及GPRS实施遵循的规范。 9. **未来发展趋势**：可能探讨了GPRS技术对4G和5G网络的影响，以及移动通信领域的未来趋势。 10. **参考文献和索引**：为深入学习提供了相关研究和资料的引用，便于读者扩展阅读。这本书对于理解GPRS在移动通信系统中的作用，以及2G和3G网络间的过渡具有很高的价值，适合移动通信领域的专业人士、研究人员和学生阅读。

Preface

highways for Internet Protocol (IP)-related services. GPRS is only the first

step in this direction: using GPRS as a base, it is possible to evolve to the

use of EDGE or the UMTS, with even more flexible service features and

even more bandwidth. These new services are expected to increase sales,

which will then be reinvested to expand even further the already existing

commercial success. The problems today (mid-2001) are still the same as

they have always been:

1. Which services can be offered and charged mobile via the Internet?

2. Will users take advantage of the magnificent ‘‘always-on’’ feature

from GPRS and UMTS in the future or remain more sporadically

connected to the Internet?

3. What should a telephone in the mobile Internet era look like, and

what features should it have? Currently, the trend is towards a

hybrid of telephone and personal digital assistant (PDA).

4. Can the network operators maintain their ruling position in this

service business or will they evolve into mere bandwidth providers,

like the telecom companies? How can this process be prevented

should it become necessary to do so?

Although this book is clearly orientated towards technological aspects

and details, benefiting from the countless questions that our customers have

asked us along the way, I would like to emphasize that it is primarily the

marketing questions that will determine the success of GPRS and UMTS,

and indeed the whole mobile communications of the future. This success

cannot be forced by the solution of technical problems alone.

This book is not aimed at presenting all the details of GSM. In our

opinion this job has already been done excellently, especially in [1, 2]. We refer

our readers to these works for a detailed description of GSM. Nonetheless, the

first chapter here is clearly focused on normal GSM. Even here, however,

important linking threads between GSM and GPRS are introduced, which

is why I strongly advise the reader against skipping this chapter. Never forget

that GPRS takes over the air interface in a practically unchanged state. For

this reason, such important procedures as cell selection and layer 1 remain

basically unchanged.

One of my experiences as an author is the annoyance at one’s own

mistakes and miscalculations. At the same time it is a problem for the reader,

as a customer, to find one of these errors. Although this problem cannot be

solved because of time pressure and my own shortcomings, it can, however,

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tjtongtong

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