Thomas Kunz
Systems and Computer Engineering
47
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