UMTS技术标准ETSI TR 121900 V3.4.0：3GPP Release 1999

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ETSI (European Telecommunications Standards Institute) 是一个在移动通信技术标准制定中具有重要影响力的国际组织，专注于推动欧洲乃至全球的电信技术进步。TR_121900V030400P.pdf 文件是 ETSI 发布的一份关于 Universal Mobile Telecommunications System (UMTS) 的技术报告，该系统是 3GPP（Third Generation Partnership Project）的一部分，旨在定义和规范第三代移动通信系统的操作方法。 3GPP TR 21.900 版本 3.4.0，发布于 1999 年 Release 1999，这份文档详细介绍了 UMTS 的工作方式，这是当时针对全球范围内的移动通信网络设计的关键标准，旨在提供更高的数据传输速率、更好的服务质量以及更广泛的网络覆盖。UMTS 是基于GSM演进的移动通信标准，它引入了3G技术，为当时的无线设备提供了更快的数据连接，对于今天的4G和5G网络的发展有着深远的影响。关键词"UMTS", "ETSI", 和 "RoutedesLucioles" 可能指的是具体的技术实现或者项目代号，而 F-06921 Sophia Antipolis Cedex-FRANCE 则表示文档的出版地，联系方式提供了访问ETSI的途径。文档强调，用户应从官方来源如 <http://www.etsi.org> 下载最新版本的PDF格式文档，因为可能存在不同版本之间的差异，且以ETSISecretariat特定网络驱动器上的PDF版本为准，以确保获取准确无误的信息。重要提示指出，这份文档可能会进行修订或状态更改，因此使用者在查阅时需留意其有效性。在处理这些技术文档时，用户不仅需要关注当前的规范细节，还需要关注可能的更新和发展动态，以保持对最新技术的了解和应用。 TR_121900V030400P.pdf 是一项关于3GPP UMTS技术的重要参考资料，涵盖了移动通信系统的实施方法、标准制定过程以及相关技术细节，对于从事移动通信技术开发、运营商优化网络以及政策制定者理解下一代通信标准都有着不可忽视的价值。

ETSI

TSI TR 121 900 V3.4.0 (2000-09)

3GPP TR 21.900 version 3.4.0 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.

ETSI

TSI TR 121 900 V3.4.0 (2000-09)

3GPP TR 21.900 version 3.4.0 Release 1999

1A References

The following documents contain provisions which, through reference in this text, constitute provisions of the present

document.

•

References are either specific (identified by date of publication, edition number, version number, etc.) or

non-specific.

•

For a specific reference, subsequent revisions do not apply.

•

For a non-specific reference, the latest version applies.

•

Non-specific references to 3GPP documents should be interpreted as referring to the same Release as the present

document, as indicated on the title page.

3G TR 21.801: "3GPP drafting rules".

3G TR 21.905: "3G vocabulary"

2 Definitions and abbreviations

For the purposes of the present document, the following terms and those in 3G TR 21.905 apply.

building block: sub-division of a feature, representing a coherent set of technical functionality which would generally

be expected to reside in a single system element

change control: procedure whereby proposed modifications to a specification are presented for approval to the TSG as

formal Change Requests

closed: specification status in which no changes of any kind to the specification are permitted

Change Request (CR): formal proposal presented on a standard form to modify a specification which is under change

control

draft: specification status prior to change control, in which changes may be made without formal Change Requests

feature: new or substantially enhanced functionality which represents added value to the existing system

frozen: specification status in which only essential corrections are permitted

Group: TSG or TSG Sub-Group

major version: For version x.y.z of a specification, x is called the major version

Example: For version 3.2.0 of a specification, the major version is 3

specification: generic term standing for Technical Specification and Technical Report

TSG: Technical Specification Group

TSG change control: specification status in which the Technical Specification Group is responsible for approval of

Change Requests

TSG Sub-Group: Working Group or subgroup of a Working Group or of a Sub-Group

Working Group (WG): official subgroup of a TSG reporting to that TSG

WG Change Control: specification status in which the Working Group is responsible for agreeing Change Requests

for submission to the TSG for approval

version: unique identifier in the form x.y.z for a specification at a given point in time

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