GSM 3GPP TS 04.06版本接口数据链路层详细规格

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GSM3GPP TS 04.06版本标准规格书，全称为"Digital cellular telecommunications system (Phase 2+); Mobile Station-Base Station System (MS-BSS) Interface Data Link (DL) Layer Specification", 是由欧洲电信标准化协会(ETSI)发布的技术规范。该文档属于3GPP（Third Generation Partnership Project）系列标准，是GSM（Global System for Mobile Communications）网络在第二阶段增强（Phase 2+）的一部分，专注于移动站（Mobile Station, MS）与基站系统（Base Station System, BSS）之间的接口数据链路层（Interface Data Link Layer, DL Layer）的详细规格。版本为8.2.1，发布于1999年的Release 1999，对应的参考文献为RTS/TSG-G-020406v821。这份文档涵盖了GSM通信系统的底层技术细节，对于理解和实现GSM网络的高效运行至关重要。关键词包括GSM、ETSI以及650 Lucioles（可能是指项目代号或会议名称），表明了其技术背景。文档提供者为ETSI Sophia Antipolis Cedex的地址和联系方式，以及其作为非盈利协会的注册信息。用户可以通过访问http://www.etsi.org下载单份文档副本。重要的是，如果存在电子版本之间的差异，官方参考版本是Portable Document Format (PDF) 的印刷版，存放在ETSI秘书处特定的网络驱动器上。在处理这份标准规格书时，开发者和网络工程师需要关注的数据链路层功能包括但不限于错误检测与纠正机制、数据速率控制、流量管理、服务质量(QoS)保障，以及无线资源管理等关键要素。这些内容对于确保GSM网络的性能稳定性和安全性具有重要意义。遵循这个标准能够确保设备间的兼容性和互操作性，推动全球移动通信系统的标准化进程。同时，了解并遵循TS 04.06规范也是确保新设备和服务符合行业标准和法规的重要步骤。

ETSI

TSI TS 100 938 V8.2.1 (2002

GPP TS 04.06 version 8.2.1 Release 1

NOTE 1: The term Dm channel is used for convenience to designate the collection of all the various signalling

channels required in the GSM system. See also 3GPP TS 04.03.

The concepts, terminology, overview description of LAPDm functions and procedures, and the relationship with other

Technical Specifications are described in general terms in 3GPP TS 04.05.

The frame formats defined for LAPDm are based on those defined for LAPD. However, there are important differences

between LAPDm and LAPD, in particular with regard to frame delimitation methods and transparency mechanisms.

These differences are necessary for operation within the constraints set by the radio path.

LAPDm supports two modes of operation:

- unacknowledged operation using UI frames;

- acknowledged operation using the multiple frame procedure.

As a choice of implementation, the two modes of operation may be implemented independently of each other. This is

possible since there is no interactions between the two modes, other than queuing at the transmitter, even when they

coexist on the same physical channel. For BCCHs and CCCHs only the unacknowledged mode of operation needs to be

implemented.

LAPDm is used for information sent on the control channels BCCH, AGCH, NCH, PCH, FACCH, SACCH and

SDCCH as defined in 3GPP TS 04.03.

NOTE 2: AGCH, NCH and PCH are sometimes referred to by the collective name CCCH and FACCH, SACCH

and SDCCH are, similarly, referred to by the collective name DCCH.

LAPDm may also be used on other types of channel.

NOTE 3: As stated in 3GPP TS 04.05, the term "data link layer" is used in the main text of this Technical

Specification. However, mainly in figures and tables, the terms "layer 2" and "L2" are used as

abbreviations. Furthermore, in accordance with 3GPP TS 04.07 and 3GPP TS 04.08, the term "layer 3" is

used to indicate the layer above the data link layer.

This Technical Specification is organized as follows:

The frame structure for peer-to-peer communication is given in clause 2. The elements of procedure and formats of

fields are given in clause 3. The elements of layer-to-layer communication are contained in clause 4. The details of the

peer-to-peer procedures are given in clause 5. Section 6 summarizes the special protocol operations used mandatorily

with SAPI=0 and SAP = 3.

The specification for the random access channel is contained in annex A, even though it is not a LAPDm function. The

present document is descriptive and does not constrain the implementation of the random access function. The

procedure is used for CHANNEL REQUEST on the RACH and HANDOVER ACCESS on the main DCCH.

(Annexes B to F are deleted).

Annex G gives an overview of actions taken on frames containing parameter errors.

1.1 Options

Support of short L2 header type 1 is an option in both the mobile station and the network; under certain conditions the

support is mandatory, as specified in other Specifications. A layer 2 protocol entity not implementing short L2 header

type 1 shall diagnose an E/A bit error and proceed as defined in annex G.2.3.

2 Frame structure for peer-to-peer communication

2.1 General

All data link layer peer-to-peer exchanges are in frames conforming to one of the formats shown in figure 1. Several

format types are shown in the figure:

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