PCEP Extensions in support of WSON Signal Compatibility Constraints

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PCEP Extensions in support of WSON Signal
Compatibility Constraints
ltdraft-lee-pce-wson-signal-compatibility-00.txtgt
Young Lee ylee_at_huawei.com Huawei Greg
Bernstein gregb_at_grotto-networking.com Grotto
Networking
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Motivation/Background

• Signal compatibility is an essential path
  computation constraint in path computation of
  WSON networks where network elements can be
  limited to processing WSON signals with specific
  characteristics and attributes.
• Signal compatibility framework has been addressed
  in the CCAMP WG as a part of WSON work items
  ltdraft-bernstein-ccamp-wson-compatibility-01.txtgt

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Signal Compatibility Constraints

• On a high-level the following network element
  information would be required for the path
  computation element (PCE) to be able to compute a
  constrained path that satisfies signal
  compatibility and processing constraints
• Input Compatibility the type of signals it can
  receive (modulation types, rate, FEC types)
• Regeneration Capability the types of
  processing/enhancement it can perform (1R, 2R,
  3R)
• The types of conversions it can perform
  (modulation types, FEC types)
• Output Format the type of signals it can
  transmit (modulation types, rate, FEC types)

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Requirement 1

• When requesting a path computation (PCReq) to
  PCE, the PCC should be able to indicate the
  following
• The acceptable signal attributes at the
  transmitter (at the source) (i) modulation
  types (ii) FEC types
• The acceptable signal attributes at the receiver
  (at the sink) (i) modulation types (ii) FEC
  types
• The GPID type of an LSP (This might have already
  been fulfilled in PCEP enhancements for GMPLS)

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Requirements 2

• The PCE should be able to respond (PC Rep) to the
  PCC with the following
• The conformity of the requested optical
  characteristics associated with the resulting LSP
  with the source, sink and NE along the LSP.
• Additional LSP attributes modified along the path
  (e.g., modulation format change, etc.)
• Special node processing with the resulting LSP
  (e.g., regeneration point)

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Example Attribute Modulation Type List sub-TLV

• S Standard (1) Vendor Specific (0)
• 1 optical tributary signal class NRZ 1.25G
• 2 optical tributary signal class NRZ 2.5G
• 3 optical tributary signal class NRZ 10G
• 4 optical tributary signal class NRZ 40G
• 5 optical tributary signal class RZ 40G
• I Input Mod Format (1) Output (0)

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Summary Next Steps

• Refine requirements.
• Adopt as a PCE WG document ?