Thomas Kunz
Systems and Computer Engineering
195
Bluetooth MAC Protocol
nError correction:
–1/3 rate
forward error correction code (FEC)
nfor SCO only
–2/3 rate
forward error correction code FEC
–Automatic
repeat request (ARQ) scheme for data
ndata transmitted in one slot is directly acknowledged by
the recipient in the next slot.
n Authentication
and Privacy
–one-way,
two-way, or no authentication possible
–use stream
cipher based on secret keys (0, 40, 64 bits)
–key
management left to higher layer software
–if stronger
protection (longer key is needed), use better encryption at network and/or application level