Generalized Burst Assembly and Scheduling Techniques for QoS Support in Optical Burst-Switched Networks Vinod M. Vokkarane, Qiong Zhang, Jason P. Jue and Biao Chen GLOBECOM 2002

Burst Segmentation

Existing Burst Assembly Techniques Timer-based Variable burst length. Threshold-based Fixed-size burst length

The Composite Burst Assembly Technique Assembling packets of different classes into a single burst. Highest-class packets are placed at the head of the burst, while lower-class packets are placed at away from the head of the burst in decreasing order of their packet class. Containing priority inside the burst header packet.

Notations in The Proposed Framework N : number of packet classes. M : number of burst priorities. K : the number of burst types, M ≤ K ≤ 2 N -1. A burst type of type k is characterized by the following parameters:

Notations in The Proposed Framework (continued)

Approach 1: Single Class Burst (SCB) with N = M

Approach 2: Composite Class Burst (CCB) with N = M

Approach 3: Single Class Burst (SCB) with N > M

Approach 4: Composite Class Burst (CCB) with N > M

Packet Loss Probability vs. Load N = 4 and M = 4

Average End-to-End Packet Delay vs. Load N = 4 and M = 4

Packet Loss Probability vs. Load N = 4 and M = 2

Average End-to-End Packet Delay vs. Load N = 4 and M = 4

Conclusion The author introduced the concept of composite bursts and described a generalized framework for burst assembly and burst scheduling. The approached with composite bursts perform better than approaches with single-class bursts with respect to providing differentiated QoS for different classes of packets.