Thomas Kunz
Systems and Computer Engineering
194
Bluetooth MAC protocol
nTime Division Duplex
(TDD) scheme for full-duplex transmissions
–master device establishes connection, slave devices
synchronize their clock with master clock
for duration of connection
nSynchronous
Connection Oriented (SCO) type (used primarily for voice)
–channel symmetric, only data packets retransmitted
nAsynchronous
Connectionless (ACL) type (used primarily for packet data)
–master unit controls the link bandwidth and decides how
much piconet bandwidth is given to
each slave, and the symmetry of the traffic
–slaves must be polled before they can transmit
data.
–The ACL link also supports broadcast messages from the
master to all slaves in the piconet