Thomas Kunz
Systems and Computer Engineering
200
Bluetooth Scatternets
nMultiple overlapping piconets (sets of communicating devices) with own hopping sequence, max of one master and 8 slaves
nCollisions do occur when two piconets use same frequency
at the same time
–as more
piconets overlap, performance degrades
–degradation
gradual: 10 overlapping piconets reduce aggregate bandwidth by 10%
nSingle device can participate in multiple piconets,
though only one at a time
–need to
re-adjust clock to re-sync with master when entering a piconet
–inform
master when device leaves piconet, will suppress data being sent/device being polled