1. BLUETOOTH
THE STANDARD & ISSUES

2. Why: What: Short range wireless links – substitute cables
On-the-fly connectivity for Handhelds’
What:
Low cost, power-efficient & Single chip
79 channels – 1 MHz. interval
1600 hops/sec.
1 Mbps - GFSK
CMOS – low cost , -70 dBm

3. Interoperability: PROFILE Features and procedures for Inter-working
Profiles
Controller & Stack
Settings
Conformance ?
BluetoothR
Vendor
Implementations

4. ARCHITECTURE COM emulation Discovery Processor-Chip comm.
Logical link,
Packet delivery
Peers’ link management
PHY, MAC processing
On-chip integration
Radio parameters

5. Bluetooth Communication Model:
PICONET
Master – Slave concept
Park–mode : more devices in Piconet
Unique PRN hopping sequences
SCATTERNET
Inter-Piconet communication
Bridging-nodes : Time sharing of Piconets

6. CONNECTION ESTABLISHMENT
INQUIRY
Faster rate, inquiry signals A B
ACK, DA, Clock offset
Identical initial hopping sequence
PAGING
Page, DA (unicast) M S
ACK => A : Master
Unique PRN

7. PICONET Expansion Discovery (inquiry) / SCAN
Low power modes : Hold, Sniff & Park
More than 7 Active slaves possible
Slave-Slave comm. not permitted

8. FH/TDD scheme : Slot = 625 u-sec.
PICONET CHANNEL
FH/TDD scheme : Slot = 625 u-sec.
SYNC Link (SCO)
Real-time voice apps
Bi-directional slot reservation
Vocoder : 10b / 1.25 ms. 16 30 33
HEADERS
DATA
GUARD BAND 79
Type
Data
FEC
Slot rep
HV3 30
3.75ms
HV2 20 10
2.5ms
HV1
1.25ms

9. MTD : Avoids slave collisions & meets QoS
ASYNC Link (ACL)
M-S Data comm. : FEC + CRC
MTD : Avoids slave collisions & meets QoS 16 17 10 3 33
HEADER
DATA
FEC
CRC
GUARD BAND 79
Multi-slots improve channel efficiency

10. BLUETOOTH LINK MANAGEMENT
L2CAP
x SAR, Integrity checks
Connection oriented <phase, local name>
Connectionless : Broadcast, multicast
Muxs’ Higher layer protocols using channels
Channel identifier <Src, Protocol>
SDP
Discovery (SDP Queries) – x Invoking
Client-Server protocol : service records <UUID, value>
Attribute specific SDP query / Browse records
v1.1 non-IP & L2CAP optimized functionality

11. LMP msgs : Environment/Link centric parameter adjustment
LINK MANAGER
LMP msgs : Environment/Link centric parameter adjustment
LMP Handshake
Authentication A B
Shared Key
Encryption
Secret Key
SECURE
Out-of-Band Pairing : Secure SEED - PIN generation

12. ADV ISSUES L2CAP, SDP & RFCOMM : Firm / Software
Allows STACK portability
High degree of Interoperability
ISSUES
Standardization of Control APIs
HV1/2 reduces throughput
Multi-slot ACL reduces channel hopping rate
Discovery latency
Affects PICONET capacity
More B devices
Profile management

13. BLUETOOTH APPS

15. REFERENCES www.cs.colorado.edu/~rhan/CSCI_7143_002_Fall_2001/Papers
Bhagwat, P., “Bluetooth: technology for short-range wireless apps”, 2001,
/Bhagwat2001_Bluetooth.pdf