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Hi all, As
pointed out by Lars just now in the meeting room, the signalling requirement
draft should be generized to be applied to all deployment scenarios or implementations. I
think what we actually need to standardize in the signalling draft is two
logical interfaces: 1) the interface between the PCN-ingress-node and the
decision node; 2) the interface between the PCN-egress-node and the decision
node. We
could also mention the common deployment scenarios in the draft (but please
note that this is not the intention of the draft and this could even be put
into the appendix), e.g.: 1)
Scenario 1, the decision node co-locates with the PCN-ingress-node: the
interface between the PCN-ingress-node and the decision node is an internal
interface which can be implemented privately within a vendor; the interface
between the PCN-egress-node and the decision node is an external interface
which must follow the standardized interface. 2)
Scenario 2, the decision node co-locates with the PCN-egress-node: the
interface between the PCN-ingress-node and the decision node is an external
interface which must follow the standardized interface; the interface between
the PCN-egress-node and the decision node is an internal interface which can be
implemented privately within a vendor. 3)
Scenario 3, the decision node co-locates with neither the PCN-egress-node nor
the PCN-ingress-node: both the interface between the PCN-ingress-node and the
decision node, and the interface the PCN-egress-node and the decision node are
external interfaces and must follow the standardized interfaces. There was an argument whether the admit/block state or
the raw data could be sent from the egress to the ingress. From my
understanding, this argument relates to two deployment scenarios: when
reporting the admit/block state, we are refering to the interface between the
decision node and the PCN-ingress-node, where the decision node is co-located
with the PCN-egress-node; when reporting the raw data, we are refering to the
interface between the PCN-egress-node and the decsion node, where the
decision node is co-located with the PCN-ingress-node. So both reportings could
co-exist since they belong to different interfaces. Since both scenarios are
valid, we don’t need to make a choice at least in the signalling draft. Best regards, Fortune |