Optical Burst Switched Networks

Jue J.P., Vokkarane V.M.0387237607

Next-generation high-speed Internet backbone networks will be required to support a broad range of emerging applications which may not only require significant bandwidth, but may also have strict quality of service (QoS) requirements. Furthermore, the traffic from such applications are expected to be highly bursty in nature. For such traffic, the allocation of static fixed-bandwidth circuits may lead to the over-provisioning of bandwidth resources in order to meet QoS requirements.Optical burst switching (OBS) is a promising new technique which attempts to address the problem of efficiently allocating resources for bursty traffic. In OBS, incoming data is assembled into bursts at the edges of the network, and when the burst is ready to be sent, resources in the network are reserved only for the duration of the burst. The reservation of resources is typically made by an out-of-band one-way control message which precedes the burst by some offset time. By reserving resources only for the duration of the burst, a greater degree of utilization may be achieved in the network.This book provides an overview of optical burst switching. Design and research issues involved in the development of OBS networks are discussed, and approaches to providing QoS in OBS networks are presented. Topics include:- Optical burst switching node and network architectures- Burst assembly- Signaling protocols- Contention resolution- Burst scheduling- Quality of service in OBS networks

---

Table of contents :
Team DDU……Page 1
Dedication……Page 6
Table Of Contents……Page 8
List of Figures……Page 12
List of Tables……Page 16
Preface……Page 18
1. INTRODUCTION……Page 20
1.1 Optical Circuit Switching……Page 22
1.2 Optical Packet Switching……Page 23
1.3 Optical Burst Switching……Page 25
References……Page 28
2.1 OBS Network Architecture……Page 30
2.2 Enabling Technology……Page 34
2.3 Physical-Layer Issues……Page 37
References……Page 40
3. BURST ASSEMBLY……Page 42
3.1 Timer and Threshold Selection……Page 43
3.2 Effect of Burst Assembly on Traffic Characteristics……Page 45
3.3 Evaluation of Threshold-Based Burst Assembly Techniques……Page 46
References……Page 54
4.1 Classification of Signaling Schemes……Page 56
4.2 Just-Enough-Time (JET)……Page 61
4.3 Tell-and-Wait (TAW)……Page 63
4.4 Intermediate Node Initiated (INI) Signaling……Page 64
4.5 Analytical Delay Model……Page 69
4.6 Numerical Results……Page 72
References……Page 75
5.1 Optical Buffering……Page 76
5.2 Wavelength Conversion……Page 78
5.3 Deflection Routing……Page 79
5.4 Burst Segmentation……Page 80
5.5 Segmentation with Deflection……Page 85
5.6 Contention Resolution and QoS……Page 95
References……Page 96
6. CHANNEL SCHEDULING……Page 100
6.1 Segmentation-Based Channel Scheduling……Page 105
6.2 OBS Core Node Architecture……Page 107
6.3 Segmentation-Based Non-Preemptive Scheduling Algorithms……Page 108
6.4 Segmentation-Based Non-Preemptive Scheduling Algorithms with FDLs……Page 113
6.5 Numerical Results……Page 117
References……Page 123
7. QUALITY OF SERVICE……Page 126
7.1 Relative QoS in OBS Networks……Page 127
7.2 Absolute QoS……Page 141
References……Page 149
8.1 Labeled OBS……Page 152
8.2 Multicasting in OBS……Page 154
8.3 Protection for Optical Burst-Switched Networks……Page 155
8.4 TCP over OBS……Page 157
8.5 OBS Testbeds……Page 160
References……Page 161
Index……Page 164