Dear all:
As discussed at the last Interim, please find proposed text in the 6TiSCH
architecture below.
What do you think?
Pascal
4.2.2. Scheduling Functions and the 6P protocol
In the case of soft cells, the cell management entity that controls
the dynamic attribution of cells to adapt to the dynamics of variable
rate flows is called a Scheduling Function (SF). There may be
multiple SFs with more or less aggressive reaction to the dynamics of
the network. The 6TiSCH 6top Scheduling Function Zero (SF0)
[I-D.ietf-6tisch-6top-sf0] provides a simple scheduling function that
can be used by default by devices that support dynamic scheduling of
soft cells.
The SF is logically divided in an abstract bandwidth adaptation logic
that is abstract to the particular technology used to obtain and
release bandwidth, and a underlying service sublayer that maps those
needs in the actual technology, which means identifying the
appropriate cells in the context of TSCH.
+------------------------+ +------------------------+
| Scheduling Function | | Scheduling Function |
| Bandwidth adaptation | | Bandwidth adaptation |
+------------------------+ +------------------------+
| Scheduling Function | | Scheduling Function |
| TSCH mapping to cells | | TSCH mapping to cells |
+------------------------+ +------------------------+
| 6top cells negotiation | <- 6P -> | 6top cells negotiation |
+------------------------+ +------------------------+
Figure 6: SF/6P stack in 6top
The SF relies on 6top services that implement the 6top Protocol (6P)
[I-D.ietf-6tisch-6top-protocol] to negotiate the precise cells that
will be allocated or freed based on the schedules of the peer. It
may be for instance that a peer wants to use a particular time slot
that is free in its schedule, but that timeslot is already in use by
the other peer for a communication with a third party on a different
cell. The 6P protocol enables the peers to find an agreement in a
transactional manner that ensures the final consistency of the nodes
state.
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