Thanks for clarification,
Le 02/04/2011 17:05, Benjamin A. Rolfe a écrit :
To further clarify: 802.15.1 is the IEEE standard base standard for
Bluetooth. If you had said 802.15.1 is to Bluetooth SIG as 802.11 is
to WiFi Alliance you would be more correct.
Ok, 802.15.1 is to Bluetooth SIG as 802.11 is to WiFi Alliance.
802.15.4 was developed for very different applications and physical
environments than Bluetooth. They are completely different standards.
802.14[5?].1 and 802.15.4 are significantly different MACs, and
802.15.4 includes multiple PHY technologies.
Ok.
IMHO BT-LE and 802.15.4 compete in the same application and
physical environment.
The latest revision (802.15.4-2011) includes the 3 PHY amendments
approved since 2006, bringing the total of distinct PHYs to 6, with
multiple banding options within some PHY specifications, all under a
single, common MAC.
Ok, I wonder what that MAC is.
There are at least 5 current task groups working on or finishing up
further amendments. It has become the most popular downloaded
standard in the 802 family and has been applied to a large variety of
very different applications.
Aha, 802.15.4-2011 is a popular download; but I cant find, sorry; by
vote count here, it seems BT-LE is popular as well and I _can_ find the
BT-LE specs.
Of course Bluetooth (802.15.1) has deployed in billions of devices
and continues to be included in nearly all consumer devices. It is
optimized for short physical range, small networks (piconets), low
energy consumption, and high density of simultaneously operating
piconets. Most implementations limit TX power and optimize for a
range of a couple meters or less.
Do you mean that BT is more adapted in more constrained
environments than 802.15.4?
For the range in meters, I read at the 6LoWPAN WG meeting slides that
BT-LE does 50-100meter.
Do you know whether 802.15.4-2011 doc refers to the use of the lowpan
adaptation layer (section 5 of rfc4944)? Or does it simply say IPv6
(like RFC2460 or so)? I can't find the 802.15.4-2011 document.
Thanks,
Alex
Hope that clarification helps.
There is a world of difference between 802.15.4 and BT-LE.
On 4/1/11 5:33 AM, "ext Alexandru
Petrescu"<[email protected]> wrote:
Le 01/04/2011 12:12, Carsten Bormann a écrit :
It seems to me IMHO bt-le is just a new phy, but same mac,
hence ip would not be affected.
From the presentation, I had a different impression.
But of course, a document stating we do things over bt-le as
usually as over bt, would not hurt.
Actually, it is required, as RFC4944 and its updates only
define 6LoWPAN for IEEE 802.15.4. If two people took these
documents and tried to apply them to BT-LE, they wouldn't
necessarily arrive at interoperable specifications.
To me IMHO bluetooth is to 802.15.4 what wifi is to 802.11 - a
marketing name. It seems sufficient to specify ipv6 over 802.15.4
and that would cover all variants of bluetooth. There is no
ipv6-over-802.11n, nor ipv6-over-wifilowpower, for example.
I may be wrong though about bluetooth being mostly 802.15.4
rfc4944 and rfc2460.
Is the WG re-opened?
No, it is alive and well until such a time when it is actually
being closed. All that was said is that the Prague meeting
will be the last physical meeting of the WG. We want to close
our unfinished business, and a number of documents are based on
discussions that went on at least since Beijing, so if they
fit our charter and we have energy to work on them, there is no
problem doing that.
sounds like doing new work without physical meetings... ok...
Alex
Gruesse, Carsten
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