[802SEC] Responses to received comments for the 15.4q PAR & 5C
All-
There were 3 comments received regarding 15.4q, one comment on the PAR
from Paul and two comments on the 5C from 802.11. Responses are in
blue below. The PAR has been updated (now 386r6) to reflect the corrected
purpose entry, namely the purpose now shows as blank which was the
originally selected option when the PAR was submitted on MyProject and a
clause has been added to the 5C (now 387r6) to enhance clarity.
These are available at
http://ieee802.org/15/pending.html
Regards
Bob
802.11 comments to 802.15.4q:
5C 3a Suggests that some existing 15.4 devices can operate with
coin cell batteries. This would imply that the existing standard is
sufficient for building compliant devices operating with coin cell
batteries.
Q: Why do you need a new Standard? How is it unique from the
existing standard?
A: 5C 3a says the current standard cannot be
used to power the majority of the existing 802.15.4 chipsets in these
applications. The operative word is majority. Addressing only a small
subset is missing a big market opportunity. This amendment addresses a
solution enabling a far broader set of applications than is currently
possible. The clause: --in a much broader set of
applications-- is being added to the end of the sentence: --This
802.15.4 PHY amendment allows the use of smaller battery form factors
such as coin cell batteries.-- to enhance clarity on this
point.
5C 3a seems to infer that the problem being solved is
related to pulse current, while 3b suggests the problem is average
current.
Q: What is the actual problem?
A: 5C 3b says: The proposed amendment to IEEE
802.15.4 will provide a unique solution for ultra low power applications.
This is the entire statement under 3b. It makes no reference to
average power, nor is average power mentioned anywhere in the 5C so we
are at a bit of a loss to understand the question. Clearly average
power is important in achieving long battery life so the lower the
average power the better. The primary issue with energy constrained
sources, like coin cells, is their inability to deliver high peak power
so that is also of primary interest here. If that can be achieved at
lower average power too, so much the better.
Paul Nikolich comment on purpose:
The current purpose states:
5.4 Purpose: The standard provides for ultra low complexity, ultra low
cost, ultra low power consumption, and low data rate wireless
connectivity among inexpensive devices. The raw data rate is high enough
(250 kb/s) to satisfy a set of applications....
Would it make sense to remove the complexity and cost parameters from
the purpose to give the project some flexibility? My concern is
this, if the WG couldn't meet all three requirements, it may prevent the
rapid completion of the project. Additionally, you've sort of
covered the low complexity/cost requirement by specifying
"inexpensive devices" in Purpose.
Response: In the submission to MyProject, the group
chose not to submit a purpose statement which is one of the MyProject
options for amendments. The purpose statement appearing in the PAR,
rather than being blank, was assigned by MyProject and is apparently one
of the original purpose statements. Staff has corrected the problem so
the purpose statement for this amendment is now blank per the initial
submission selection.
Bob Heile, Ph.D
Chairman, ZigBee Alliance
Chair, IEEE 802.15 Working Group on Wireless Personal Area Networks
Co-Chair IEEE P2030 Task Force 3 on Smartgrid Communications
11 Robert Toner Blvd
Suite 5-301
North Attleboro, MA 02763 USA
Mobile: +1-781-929-4832
email: bheile@ieee.org
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