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

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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

  • 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 1: Mesh-Torus Network (continued)


Example 2: ShuffleNet


Example 2: ShuffleNet continued)


Requirements for A New QoS Measure

  • Unbiased.

  • Make reference to the individual requirements of SD pairs.

  • One-sided.

  • Take the potential revenue into consideration.


New Performance Measure

  • 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)

  • 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 (continued)

  • 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

  • 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).


Case Studies (continued)


Case Studies (continued)


Conclusion

  • 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.


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