Clearly we should not be specifying MAC protocols here, and there is a
lot of energy and flux around the 15.4 MAC (e.g. the 15.4E working group
is chartered to update it to make it capable of time synchronization and
channel hopping).
We have talked in this group about developing an abstraction for the MAC
layer which allows us to capture the tradeoffs between, e.g.,
throughput, latency, and duty cycle available in many of the non-IEEE
MAC implementations that use the 15.4 PHY.
Can we generate an explicit list of attributes as you suggest, including
abstractions of some of these features that many/most of us use, but
which are still not a part of the 15.4 MAC?
ksjp
Jonathan Hui wrote:
I'm not convinced that this WG (or the IETF in general) is the
appropriate place to specify MAC protocols. Requiring the use of
specific MAC protocols is tantamount to specifying the protocol. W.r.t
commissioning/bootstrapping, the way I see it is that the link-layer/MAC
simply has a set of attributes, some of which 6LoWPAN utilizes (e.g.
short-addrs, EUI-64, etc.). These attributes must be configured
somehow, but the specific way they get set is out of scope of this WG.
--
Jonathan Hui
Geoff Mulligan wrote:
We have not had any lively discussion on this list for quite some time
(actually we have not had ANY discussion on this list for quite some
time)! Vacation is over!
Topic: What 15.4 MAC functions / features should be used or relied upon
or required by 6lowpan.
Carsten reminded me that this was a topic of discussion at the last
IETF.
There were some suggestions that we should utilize some of the 15.4 MAC
primitives for 6lowpan commissioning / bootstrapping. Others insisted
that we not require any of the 15.4 primitives.
Let try to resolve this question.
[ Carsten and I are reviewing the discussion on the charter text to see
where we are and if the text should be changed - next weeks topic!! ]
geoff
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