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Bluetooth

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Bluetooth Still Waiting for the Tsunami! Bluetooth History Ericsson initiative Special Industry Group: (Promoters) Ericsson, IBM, Intel, Nokia, and Toshiba. – PowerPoint PPT presentation

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Title: Bluetooth


1
Bluetooth
  • Still Waiting for the Tsunami!

2
Bluetooth History
  • Ericsson initiative
  • Special Industry Group (Promoters) Ericsson,
    IBM, Intel, Nokia, and Toshiba.
  • Very fast development of version 1.0
  • Today, about 3000 adopters
  • Version 1.1 available at www.bluetooth.com
    (Royalty free)
  • IEEE 802.15.x

3
Design Objectives of Bluetooth
  • Low power
  • Low cost
  • Full interoperability with no user intervention

4
Brain Storming
  • How to connect two radio nodes?

5
Bluetooth Scenario
Learning about others
Inquiry Scan
Inquiry Scan
Inquiry Scan
Inquiry Search
6
Bluetooth Scenario
Invitation to communicate
Page Scan
Page Scan
Inquiry Scan
Page
7
Bluetooth Scenario
Communicating
Slave
Slave
Inquiry Scan
Master
8
Bluetooth Logical View
Application Group
Middleware Protocol Group
Transport Protocol Group
9
Transport Protocol Group
Application Group
Middleware Protocol Group
Transport Protocol Group
Radio
10
Transport Protocol Group
Bluetooth Device 1
Bluetooth Device 2
Link Manager
Link Manager
Link Controller
Link Controller
Radio
Radio
11
Transport Protocol Group
Link Manager
Link Controller
  • ISM Band (2.4 GHz to 2.483 GHz)
  • 79 channels of 1 MHz each starting at
  • 2,402 MHz
  • Frequency Hopping
  • 1600 times per second (Tx/Rx)
  • 3200 times per second (Pag/Inq)
  • Maximum raw datarate 1 Mbit/s

Radio
12
Transport Protocol Group
Link Manager
  • 28-bit clock (3200 Hz)
  • Paging/Inquiring
  • Frequency Hop selection
  • Link types
  • MAC
  • Power modes
  • Security algorithms

Link Controller
Radio
13
Paging/Inquiring
Master
Slave
14
Frequency Hop Selection
Country Mode
Frequency for Tx/Rx
Frequency Selection Module
Bluetooth address
Clock (Master)
15
Frequency Hopping
0
1
2
3
4
5
Slot
Master
T
R
T
R
T
R
Slave 1
R
T
Slave 2
R
T
R
T
Slave 3
625µs
16
Link Types
  • Synchronous Connection-Oriented links (SCO)
  • High priority traffic real time traffic
  • 64Kbits/s
  • 3 max per piconets
  • Asynchronous Connectionless Links (ACL)
  • Gets left over bandwidth

17
Medium Access Control
  • Master starts Tx on even slots
  • Slaves starts Tx on odd slots (if Master just
    transmitted to this slave on previous slot)
  • Exponential backoff when responses to inquiries
    collide

18
Power Modes
Standby
Unconnected
Inquiry
Page
Connecting
Connected
Transmit Data
Active
Park
Hold
Low Power
19
Transport Protocol Group
  • Security Management
  • Power Management (States of node)
  • QoS Management

Link Manager
Link Controller
Radio
20
Transport Protocol Group
Application Group
Middleware Protocol Group
Transport Protocol Group
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