New qos measures for routing and wavelength assignment in wdm networks
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New QoS Measures for Routing and Wavelength Assignment in WDM Networks. Shi Zhong Xu and Kwan L. Yeung Dep. Of EE, The Univ. of Hong Kong ICC’2002. Example 1: Mesh-Torus Network. The Disadvantages of OABP Measurement.

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New qos measures for routing and wavelength assignment in wdm networks

New QoS Measures for Routing and Wavelength Assignment in WDM Networks

Shi Zhong Xu and Kwan L. Yeung

Dep. Of EE, The Univ. of Hong Kong

ICC’2002



The disadvantages of oabp measurement
The Disadvantages of OABP Measurement WDM Networks

  • The overall average blocking probability (OABP) is not a good performance measure.

    • It hides the information of service deviation among node pairs.

    • It does not consider the revenue generated by different types of calls.



Example 2 shufflenet
Example 2: ShuffleNet WDM Networks



Requirements for a new qos measure
Requirements for A New QoS Measure WDM Networks

  • Unbiased.

  • Make reference to the individual requirements of SD pairs.

  • One-sided.

  • Take the potential revenue into consideration.


New performance measure
New Performance Measure WDM Networks

  • B*ij : QoS requirement of a SD pair ij.

  • λij : arrival rate for SD pair ij.

  • Λ = Σijλij.

  • The overall average blocking probability (OABP) is biven by


New performance measure continued
New Performance Measure (continued) WDM Networks

  • A new class of composite performance measures is designed as follows,

  • I is the set of node pairs with blocking probabilities exceeding their QoS requirements.

  • Lij is a punishing factor proportional to the shortest distance between nodes i and j.


New performance measure continued1
New Performance Measure (continued) WDM Networks

  • EB(1) can be considered as the weighted average excessive blocking.

  • EB(2) can be considered as the mean square weighted excessive blocking.


Case studies
Case Studies WDM Networks

  • Least-loaded routing (LLR).

  • Fixed path least congestion routing (FPLC).

  • New fixed path least congestion routing (NFPLC).

  • Fixed routing with random wavelength assignment (FR_RAND).

  • SPREAD routing based on layered graph (LG).




Conclusion
Conclusion WDM Networks

  • A new class of composite measure EB(p) is proposed.

  • Compared with OABP, EB(p) is unbiased, makes reference to the QoS requirements, one-sided, and takes the potential revenue loss into consideration.