Page 104 - ITU-T Focus Group IMT-2020 Deliverables

3 ITU-T Focus Group IMT-2020 Deliverables

Figure 6.1.5-1 – Detnet architecture

The application plane consists of user agent which is a special application to interact with the end users or
providers. In addition, application plane will implement the request for Detnet services from providers via
FME. The control plane most importantly includes PCE which will play the core role of computing the path.
The control plane will communicate with the application plane through the northbound interface. The
network plane consists of all network devices, such as intermediate nodes like IP routers and switches, and
NIC of the host. The intermediate nodes report their capability and physical resources to the control plane,
and update the PCE topology data bases through the southbound interface. Then PCE computes the path and
sets the path up for each flow
For the data plane of Detnet, draft-ietf-detnet-dp-alt analyses the existing IP, MPLS and other encapsulations
which can be considered as the baseline for detnet data plane definition. The DetNet data plane is logically
divided into two layers: service layer and transport layer. The DetNet service layer provides adaptation of
DetNet services, it is composed of a shim layer to carry deterministic flow specific attributes, which are
needed during forwarding and for service protection. The DetNet transport layer operates below and
supports the DetNet Service layer and optionally provides congestion protection for DetNet flows. The draft
lists a set of criteria to help to evaluate the potential data plane options. According to the draft, the
alternatives of service layer and transport layer are shown in the below figure cited from draft-ietf-detnet-
dp-alt.

Figure 6.1.5-2 – Detnet data plane alternatives

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