Benjamin A. Rolfe writes:
> There is certainly no intent, at least with any of the documents I
> have posted regarding PAN ID compression, to change behaviors as
> understood by those using 802.15.4e as published, the intention is
> to clear up ambiguity in amendment and correct obvious errors (like
> the inclusion of MP-frames in the PAN ID compression table, which
> makes no sense)
Yes. Luckily the MP-frames do not even have PAN ID compression field,
only the PAN ID Present flag, and source PAN ID always matches the
destination PAN ID...
Listing MP-frames in that table did confuse me originally...
> We received comments from people who could not unambiguously
> determine what to implement given the text published in 2012. It is
> therefore our job to "fix" the text so that it can be implemented
> consistently. There were also several errors introduced WRT the
> "legacy" behavior (frame version < 2) which were not intended by
> TG4e, such as losing the text which specified that PAN ID
> compression is only used when the source and destination PAN IDs are
> equal.
Reading table 2a in 802.15.4e indicates that there is no way to send
following frame:
* Has IEs, i.e. requires 0b10 frame format
* Has source address and source PAN ID
* Has destination address and destination PAN ID
* And those source and destination PAN IDs are not same
I.e. you cannot anymore send frames using 0b10 frame format from one
PAN to another... This is possible with frame format 0b00 or 0b01, but
if you want to use IEs or anything that requires 0b10 frame format,
then you are out of luck.
In your 15-15-0130-03 document you changed this to be possible by
changeing "short or extened" / "short or extened" / "0" (PAN ID
compression) / "Beacon, Data, Acknowledgement, Command", so that it
says "Present" / "Present" instead of "Not Present" / "Present" in PN
ID columns.
So I assume this was one of those unambiguities you mentioned there?
> The point of querying implementers and developers of other
> specifications based upon the published standard is to resolve
> ambiguities in a rational and realistic way. It would be of great
> help to the revision task if you can clarify what "following the
> information from Table 2a" means specifically.
Yes...
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