Hi,
Some small corrections to the list of typical LoWPAN characteristics:
o Limited processing capability: the smallest common LoWPAN nodes
have 8-bit processors with clock rates around 10 MHz. Other
models exist with 16-bit and 32-bit cores (typically ARM7),
running at frequencies in the order of tens of MHz.
o Small memory capacity: common RAM sizes for LoWPAN devices consist
of a few kilobytes, usually 4K or 8K bytes. However, a wide
variety of RAM sizes is available, reaching from 1K up to 256K
bytes.
o Low power: wireless radios for LoWPANs are normally battery-
operated. Their RF transceivers often have a current draw of
about 10 to 30 mA, depending on the used transmission power level.
In order to reach common indoor ranges of up to 30 meters and
outdoor ranges of 100 meters, the used transmission power is set
around 0 to 3 dBm. Depending on the processor type, there is an
additional battery current consumption of the CPU itself, commonly
in the order of tens of milliamperes. However, the CPU power
consumption can often be reduced by a thousandfold when switching
to sleep mode.
o Short range: the Personal Operating Space (POS) defined by IEEE
802.15.4 implies a range of 10 meters. For real implementations,
the range of LoWPAN radios is typically measured in tens of
meters, but can reach over 100 meters in line-of-sight situations.
o Low bit rate: the IEEE 802.15.4 standard defines a maximum over-
the-air rate of 250K bit/s, which is most commonly used in current
deployments. Alternatively, three lower data rates of 20K, 40K
and 100K bit/s are defined.
Dominik
On Wed, Sep 30, 2009 at 2:05 PM, Dominik Kaspar <[email protected]> wrote:
> Hi,
>
> I have addressed the first major comment to the Use Cases draft given
> by several reviewers, which was about the typical characteristics of
> LoWPANs being out of date. Here is a new list, I hope it better
> reflects the current state of the art.
>
> [...]
_______________________________________________
6lowpan mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/6lowpan
