On 08/01/2013 09:17 AM, Giovanni Martinelli (giomarti) wrote:
Another use case (very particular to mu interests) is when I want to ask the PCE to perform routing and spectrum assignment. I want the PCE to compute a path of a given spectrum width, to pre-establish it. the width is given by the corresponding OTS / slot, and the actual client signal mapping is unknown, and will depend on the modulation format and FEC. I don't know what bandwdith I would convey in the message.
What exactly inputs you have to your CSFP and what the output you expect?
We are still working on that, so take this as a "preliminary" answer :-) Without discarding more complex inputs / outputs, at the bare minimum, assuming all / most paths are pre-qualified, I would expect the following use case:
- A NMS (sorry, now I should say SDN controller :P) acting as a PCC sends a request for a network media channel; the request contains the endpoints that identify the nodes/transceivers and somehow conveys (TSPEC?) that I want a pipe - media channel of "100 GHz". The PCE would then perform RSA and return the ERO and, for example, explicit label control in which at each hop I have the outgoing frequency slot. If the PCC requested a given TSPEC, that would be easy to implement with the "m" paramenters. If the PCE has allocated a bigger media channel (for some reason) it should return the allocated "m", which hopefully wll be >= requested m. This is in the spirit of the "separation of concerns" that we are not focussing on the signal mapping Signal > media layer.
This does not preclude that we may end up thinking of more complex scenarios where the PCE assigns also the modulation format / number of subcarriers, etc. etc. but this is yet to be seen, and a bit too early I guess.
Thanks R.
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