Managing Service Level Quality: Across Wireless and Fixed Networks

✍ Scribed by Peter Massam

• Publisher: Wiley
• Year: 2002
• Tongue: English
• Leaves: 183
• Edition: 1
• Category: Library

✦ Synopsis

QoS (Quality of Service) and Network Management are old topics. However, the fusion of IP style multimedia and wireless networks (3G) means that network managers who might previously have dealt with one or the other, must now manage and provide service guarantees for the both. This is where Managing Service Level Quality across Wireless and Fixed Networks steps in...It begins by examining the mechanisms that already existed in fixed IP data networks prior to the introduction of probe and agent technology. A look at these later developments is then supplemented with a real-world scenario of how real time application performance monitoring can not only provide service level management but can also aid in root cause analysis.This same model is then applied to a wireless environment examining which elements are required to be able to deliver multimedia services across 2nd and 3rd generation mobile networks, detailing the components of data networking that will assist in guaranteeing service level performance and the constraints placed on those guarantees when passing services over an air interface to a wireless-enabled device.It asks a simple question: will multimedia applications and the guaranteed levels of service required by them work when traversing from fixed to wireless networks?It tracks QoS components and mechanisms of both environments and looks at what will provide the glue in this brave new converged world and also provides empirical data to back up the conclusions drawn. First book available which applies QoS techniques and technologies to wireless/mobile networks 3G/UMTS Deals with the search for the real time information that constitutes the "customer experience" in terms of application performance so that service levels can be verified against measurable and relevant data in a true end-to-end manner across both fixed and wireless networks Presents probe and agent technology Features a real-world scenario of how real time application performance monitoring can not only provide service level management but can also aid in root cause analysis - this will be of particular interest to practitioner Analyses which elements are required in order to deliver multimedia services across 2nd and 3rd generation mobile networks Details the components of data networking that will assist in guaranteeing service level performanceEssential reading for Wireless and IP data network professionals/practitioners, network managers and architects, technical consultants, quality assessment engineers, infrastructure vendors, application developers, portal designers, wireline operators, lecturers, postgraduates, senior undergraduate students and industry trainees.

✦ Table of Contents

MANAGING SERVICE LEVEL QUALITY ACROSS WIRELESS AND FIXED NETWORKS......Page 4
Contents......Page 8
Preface......Page 12
List of Figures......Page 14
List of Test Figures......Page 16
List of Tables......Page 18
Acknowledgments......Page 20
Introduction......Page 22
1.2 Scope......Page 24
1.3 Summary......Page 25
2.1 Summary......Page 26
2.2.2 Network Management Features Deemed Most Important (1992)......Page 27
2.2.3 Network Management Features Deemed Most Important (2000)......Page 28
2.2.4 Automated Tools Requirement......Page 29
2.3.1 SNMP Origins......Page 30
2.3.2 SNMP (Renamed SNMP v1)......Page 31
2.3.3 SNMP Version 2 (SNMP v2c)......Page 32
2.3.4 SNMP Version 3 (SNMPv3)......Page 34
2.4 Management Information Base (MIB-I, MIB-II and extensions)......Page 36
2.4.2 SMI Directory Tree......Page 37
2.4.3 MIB-II Groups......Page 38
2.4.4 Application Identification......Page 39
2.5.1 RMON2 MIB Location......Page 40
2.5.4 RMON2 Limitations......Page 41
2.6.3 OSI Management Model Overview......Page 42
2.6.5 CMIS Capabilities......Page 44
3.1 Systems Management System (SMS)......Page 46
3.2.1 Objections to ARM......Page 47
3.3.3 CIM Schema......Page 48
3.3.5 CIM Capabilities Today......Page 49
3.4.1 SLA Factors Deemed Most Important (2000)......Page 50
4.2 Network Probes (or X-ray Tools)......Page 52
4.2.2 Limitations and Constraints......Page 53
4.3.3 Strengths of Capture and Playback......Page 54
4.4.2 Passive Considerations......Page 56
4.5.2 NIMI Architecture......Page 57
4.5.3 Lessons Learnt from NIMI......Page 58
5.1.1 What is an Agent?......Page 60
5.1.2 Endpoint and Server Functions......Page 61
5.2 TCP Flows......Page 62
5.3 Summary......Page 63
6.2 Application-level Traps......Page 64
6.2.1 Application Thresholds......Page 65
6.4 Bi-directional Interaction......Page 66
6.4.2 Challenges and Possible Solutions......Page 68
7.1 Synopsis of Mechanisms......Page 70
7.2 Summary......Page 71
8.2 Scope......Page 72
8.3 Summary......Page 73
9.1 Summary......Page 74
9.2.1 GSM Architecture......Page 75
9.2.2 The Radio Link Function......Page 77
9.2.3 The Network Function......Page 82
9.2.4 Integrated Voice and Data Services......Page 84
9.3.1 GPRS Architecture......Page 85
9.3.2 GPRS Lower Layer Protocols......Page 87
9.3.3 Call Setup......Page 90
9.3.4 The Air Interface......Page 91
9.3.5 Coding Schemes......Page 95
9.3.7 QoS Profiles......Page 96
9.4.1 UMTS (or 3G) Architecture......Page 101
9.4.2 QoS Service Architecture......Page 102
9.5 Implications of a 3GPP Mandated Standard......Page 105
10 Moving to Wireless......Page 106
10.1 QoS Roots......Page 107
10.2 Router Scheduling and Queuing......Page 108
10.2.2 Priority Queuing......Page 109
10.2.3 Class-based Queuing and Weighted Round-robin......Page 110
10.2.5 Packet Discard......Page 111
10.3 TCP Operations......Page 113
10.3.2 TCP Window Sizes......Page 114
10.4 UDP Operations......Page 115
10.5 RTP Operations......Page 116
10.6 IPv6......Page 118
10.7 QoS Approaches in Fixed Networks......Page 119
10.7.2 RSVP and IntServ......Page 120
10.8 DiffServ......Page 123
10.8.2 DiffServ Marking......Page 124
10.8.3 Per Hop Behaviours......Page 125
10.9 MPLS......Page 126
10.9.1 Benefits......Page 127
10.9.4 MPLS Operations......Page 128
10.9.5 Flexibility and Future Development......Page 129
10.10.1 RTP Payload Types......Page 130
10.10.2 Header Compression......Page 131
10.10.3 Video Compression......Page 132
10.11 Summary......Page 133
11 Wireless Performance......Page 136
11.2 The 3G Demonstrator......Page 137
11.3.1 Methodology and Test Lab Topology......Page 138
11.4.1 Live Network Results......Page 139
11.4.2 Laboratory Network Results......Page 140
12.1 Synopsis of Test Results......Page 152
12.2 Summary......Page 153
References......Page 156
Appendix A......Page 158
Appendix B......Page 160
Appendix C......Page 162
Appendix D......Page 164
Appendix E......Page 166
Abbreviations......Page 168
Index......Page 174