Hi Timofei,
I just read about this in the specification :-)
If you are working on the beacon mode, maybe you can clarify something
for me what I never understood about the whole system:
If a coordinator is sending out beacon frames and children (FFD,
possible routers) associate to him, how and when are they sending THEIR
beacons for THEIR children.
There can be even more "layers" so that the children are parents for
their own children and these children are again partents ... and so on
until the restrictions of the PAN are reached (max. depth)
If the children send their beacons at the same time as their parents
there will be interference.
So either they
- send their beacon in the CAP of their parent (small amont of time and
if this is done for their children as well the beacon periode will
shrink every time)
- send their beacon in the time after CFP and the start of the next
beacon (again, the beacon period will decrease ...)
Am I missing something or is beacon mode only working for 1 parent and
the associated children?
Martin
Timofei Istomin wrote:
Hi!
Martin Gercke wrote:
Else my NWK Layer will never know who's around.
It can use the Active scan mode, i.e. broadcast the beacon request
command before channel listening. All coordinators from the
neighborhood should reply with a single beacon.
To my mind the most serious problem with the beaconless mode is the
need of being always online, or care about synchronization somewhere
above NWK.
We are trying to implement the beacon mode, but it's quite difficult.
There are very strict time requirements.
Timofei.
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