Bluetooth Technology

1
Bluetooth Technology

• Digital Data Communications
• CSIR 1359

2
Bluetooth

• Bluetooth creates small wireless networks called
  Personal Area Networks (PANs) between PCs and
  peripheral devices
• PDAs, printers, keyboards, mice, cell phones,
  home stereos, televisions, home security systems
• IEEE 802.15 standard
• Throughput from 723 Kbps to 1 Mbps
• Maximum range of 10 meters (33 feet)

3
Bluetooth Operation Modes

• Operates in an automatic master/slave
  relationship
• One master controls up to seven slave devices
• A Bluetooth PAN is called a piconet (meaning very
  small)
• Up to 255 devices may participate but only seven
  may be active at a time
• An inactive slave device is called a parked device

4
Bluetooth Communication Stages

• Device discovery
• Broadcasts its MAC address an a code identifying
  the type of device
• May set device to non-discovery mode to skip this
  stage
• Name discovery
• Device identifies itself by a friendly name
• Such as iPAQ Pocket PC
• Association
• Device officially joins the network
• Some devices require a PIN code for security
• Also called bonding, pairing, or joining
• Service profile
• Defines the kind of service it provides

5
My Bluetooth Places
6
Data Transfer

• Synchronous Connection-Oriented (SCO)
• Guarantees all data transmitted is received
• Good for file transfers
• Master nodes support up to 3 SCO connections at a
  time with up to 3 slave units

• Asynchronous Connectionless (ACL)
• No guarantee of delivery
• Faster
• Good for streaming media
• Point-to-point (master to slave) or broadcast
  (master to all slaves) links

7
Bluetooth Services

• Services supported by Bluetooth are called
  profiles
• Generic Access Profile defines how units discover
  and establish connections
• Service Discovery Profile enables discovery of
  services other devices provide
• Cordless Telephony Profile defines wireless phone
  functionality
• Intercom Profile defines wireless intercom
  functionality
• Serial Port Profile enables a device to emulate
  serial port communication
• Headset Profile defines wireless telephone and PC
  headset functionality

8
Bluetooth Services

• Dial-up Networking Profile defines capability to
  act as or interact with a modem
• Fax Profile defines capability to act as or
  interact with a fax device
• LAN Access Profile defines how a device accesses
  a LAN or the Internet
• Generic Object Exchange Profile defines how to
  exchange data with other devices
• Object Push Profile is used to exchange small
  data objects
• File Transfer Profile is used to exchange large
  data objects like files
• Synchronization Traffic is used to synchronize
  data between PDAs and PCs

9
Bluetooth Services
10
Bluetooth Security

• 128-bit encryption and per-user passwords
• Point-to-Point Tunneling Protocol (PPTP) and
  Secure Sockets Layer (SSL) for browser-based
  remote access
• MAC filtering
• Non-discovery mode to hide them from other devices