Thomas Kunz
Systems and Computer Engineering
198
Bluetooth Power States
STANDBY: periodically listen for messages every
1.28
seconds by
listening to set of 32 hop frequencies
defined for
this device (less in France, Spain, Japan)
Connection
procedure: one device becomes master,
initiates
connection by PAGE (if address is known)
or INQUIRY,
followed by PAGE (if address unknown)
PAGE: send 16 identical page messages on 16 of
32 defined
hop frequencies for slave device, if no
response,
send page on remaining 16 frequencies
- maximum
delay: 2.56 seconds
- average
delay 0.64 seconds
INQUIRY: similar to PAGE, but may require one
additional
train to collect responses, used for device
discovery
HOLD: power saving mode for slave devices when
no data
needs to be transmitted
PARK/SNIFF: other power saving modes
SNIFF:
listen to traffic at user programmable intervals
PARK: listen
to traffic periodically, re-synchronize
with
master every so often