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Nowadays, when we speak of GSM, we usually mean ªoriginalº GSM ± also known as GSM900 since 900 MHz was the original frequency band. To provide additional capacity and enable higher subscriber densities, two other systems were added later: GSM1800 (also DCS1800) and GSM1900 (also PCS 900). | sfâLùJ VOL 2 Pocket Guide Wandel Goltermann Communications Test Solutions g Pocket Guide for Fundamentals and GSM Testing Publisher Wandel Goltermann GmbH Co Elektronische Meßtechnik RO. Box 1262 D-72795 Eningen u.A. Germany e-mail solutions@wg.com http www.wg.com 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 Um.13 5.1 Logical channels on the air interface.15 5.2 Traffic channels on the air interface.17 5.3 Signaling channels on the air interface .18 5.4 Burst formats.20 5.5 Protocols on the air interface.22 6 The Abis interface .24 6.1 The TRAU frame.26 6.2 Protocols on the Abis interface.28 7 The A interface . 30 7.1 Protocols on the A interface.30 8 MSC-based interfaces.32 8.1 MSC protocols .33 9 Call setup.35 10 Test and measurement problems in GSM . 37 11 Outlook .46 12 GSM glossary.47 13 Bibliography . 51
