On Wavelength Reservation for Optical Wavelength Routed WDM Networks

1
On Wavelength Reservation for Optical Wavelength
Routed WDM Networks
DAWN Networking Research Laboratory Washington
State University Pullman, Washington 99164
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Introduction
Total Available bandwidth

• Limit and Out of Limit Classes
• ? (Relaxation factors)
• Learning Phase (Regulating ?)
• 2-Link Model

Video Voice Data ( X)
(Y) (Z) ?video
?voice ?data
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The Wavelength Reservation Algorithm
Case ?1 is available (Wavelength ?1 on the
previous link L1 is available on L2)
X
n
m
L1 L2

• Is ?1 is available ?
• Tgt Is class under consideration within limit ?
• T gt Reserve ?1 for a time ti lt t start

• F Is ?current(Current Class) lt ?MAX(Current
  Class)
• T gt Borrow ?1 (Increase ?current(Current Class)
  )

• F gt Block

?1 ?2
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The Wavelength Reservation Algorithm (contd.)
Case ?1 is not available (Wavelength ?1 on the
previous link L1 is not available on L2) and
Sub-case some other wavelength(s) (say ?2) is
available
n
m
L1 L2

• Is the class within limit
• Tgt Choose the wavelength (say ?2) on some
  Wavelength allocation strategy.

• F Is ?current(Current Class) lt ?MAX(Current
  Class)
• T gt Borrow ?1 (Increase ?current(Current Class)
  ) Adjust ? factors

• F gt Block

?1 ?2
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The Wavelength Reservation Algorithm (contd.)
Case ?1 is not available (Wavelength ?1 on the
previous link L1 is not available on L2) and
Sub-case no wavelengths are available
X
n
m
L1 L2

• Is the class within limit (Blocked case)
• Tgt Change ?MAX(Current Class)
• Fgt Do nothing

?1 ?2