UMTS技术标准：ETSI TR 121900 V3.3.0 3G Release 1999

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ETSI（欧洲电信标准化协会）是全球电信行业的权威组织，专注于制定和维护移动通信技术的标准。在这个特定的文档"ETSI TR 121900V3.3.0 (2000-06)"中，它关注的是3G技术的通用移动通信系统（Universal Mobile Telecommunications System, UMTS）的工作方法。3GTR21.900版本3.3.0是在1999年发布的，这个版本是对于1999年之前技术的一个重要更新。该技术报告详细阐述了UMTS系统的架构、协议和操作规范，旨在确保不同运营商之间的设备和服务能够无缝兼容和高效运行。关键词"UMTS"和"ETSI"强调了其在第三代移动通信（3G）领域的核心地位，而"650 RoutedesLucioles"可能是文档发布机构或研究团队的标识。文档的发布地设在法国索非亚-安提波利斯，提供了联系信息以便用户获取更多信息或报告问题。用户被明确告知，尽管电子版可能以多种格式存在，如PDF，但最终参考版本是纸质版或特定网络驱动器上的PDF版本，以解决可能存在的版本差异问题。值得注意的是，文档的使用者应意识到这份材料可能会随着时间的推移进行修订或状态更改，因此在引用时需要确保查阅的是最新版本。ETSI网站（http://www.etsi.org）是获取这些更新和最新文档的主要途径。 ETSI TR 121900V3.3.0是一个关键的资源，对于理解3G UMTS技术的实施、标准化和演进具有重要意义，不仅对通信设备制造商、运营商，也对无线通信研究者和政策制定者来说都是不可或缺的参考资料。

ETSI

TSI TR 121 900 V3.3.0 (2000-06)

3G TR 21.900 version 3.3.0 Release 1999

Foreword

This Technical Report has been produced by the 3GPP.

The contents of the present document are subject to continuing work within the TSG and may change following formal

TSG approval. Should the TSG modify the contents of this TR, it will be re-released by the TSG with an identifying

change of release date and an increase in version number as follows:

Version x.y.z

where:

x the first digit:

1 presented to TSG for information;

2 presented to TSG for approval;

3 Indicates TSG approved document under change control.

y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,

updates, etc.

z the third digit is incremented when editorial only changes have been incorporated in the specification;

Introduction

In order to ensure correctness and consistency of the specifications (i.e., technical specifications and technical reports)

under responsibility of the Technical Specification Groups (TSG) of the 3

Generation Partnership Project (3GPP),

clear, manageable and efficient mechanisms are necessary to handle version control, change control, document

updating, distribution and management.

Also, the fact that the specifications are/will be implemented by industry almost in parallel with the writing of them

requires strict and fast procedures for handling of changes to the specifications.

It is very important that the changes that are brought into the standard, from the past, at present and in the future, are

well documented and controlled, so that technical consistency and backwards tracing are ensured.

The 3GPP TSGs, and their sub-groups together with the Support Team are responsible for the technical content and

consistency of the specifications whilst the Support Team alone is responsible for the proper management of the entire

documentation, including specifications, meeting documents, administrative information and information exchange with

other bodies.

1 Scope

This document outlines the working methods to be used by the 3GPP Technical Specification Groups and their Working

Groups and their Sub-Groups, and by the 3GPP Support Team in relation to document management, i.e. handling of

specifications, updating procedures, change request procedures, version control mechanisms, specifications status

information etc. It complements the rules and procedures defined for 3GPP. This document does not stipulate the details

of the internal working of the TSG Sub-Groups. From the Technical Specification Group point of view, a task and

responsibility is given to a Working Group directly answering to the Technical Specification Group. In practice, the

work/task may be carried out in a subgroup of that Working Group.

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