tailieunhanh - GIÁO TRÌNH GSM

Hard to fathom, but it really wasn't all that long ago that even a plain old telephone was a luxury item. But, as we all know, technology's only constant is change. In this day and age, many folks need to be accessible everywhere, whether they're at work or play, in the office or at home. To meet this demand, the GSM standard (Global System for Mobile Communications) for mobile telephony was introduced in the mid- 1980s. Today, GSM is the most popular mobile radio standard in the world. A boom is underway, such that many GSM users find life without their phone practically inconceivable | VOL 2 Pocket Guide Wandel Goltermann Communications Test Solutions Pocket Guide for Fundamentals and GSM Testing Publisher Wandel Goltermann GmbH Co Elektronische MeBtechnik RO. Box 12 62 D-72795 Eningen . Germany e-mail solutions@ http Author Marc Kahabka CONTENTS 1 Mobility - The magic word . 3 2 GSM overview . 5 3 GSM system architecture. 7 4 Interfaces and protocols .11 5 The air interface Logical channels on the air Traffic channels on the air Signaling channels on the air interface .18 Burst Protocols on the air 6 The Abis interface .24 The TRAU Protocols on the Abis 7 The A interface . 30 Protocols on the A 8 MSC-based MSC protocols .33 9 Call 10 Test and measurement problems in GSM . 37 11 Outlook . 46 12 GSM 13 Bibliography . 51