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IEEE Wireless 2002 Conference - Seattle2/25/02
How To Use Bluetooth:
Implementation of Current TechnologyCopyright 2002 Stonestreet One, Inc
Tim Reilly
Stonestreet One
IEEE Wireless 2002 Conference - Seattle2/25/02
Overview of Presentation
• Overview of Bluetooth protocol stack architecture and how it is partitioned today
• Typical system architecture today
• Product development areas
• Interfaces available
• Bluetooth qualification process overview
IEEE Wireless 2002 Conference - Seattle2/25/02
About Stonestreet One
• Established in 1996 in Louisville, KY, US. • Offer Engineering Design Services,
Bluetooth Protocol Stack, and Bluetooth Developer Kits.
• More info can be found at www.stonestreetone.com
IEEE Wireless 2002 Conference - Seattle2/25/02
Overview of Bluetooth Stack
Applications and Profiles
Upper Layers of Stack
Lower Layers of Stack
IEEE Wireless 2002 Conference - Seattle2/25/02
Overview of Bluetooth Stack
Lower layers of Bluetooth stack
IEEE Wireless 2002 Conference - Seattle2/25/02
Overview of Bluetooth Stack
Lower layers of Bluetooth stack
•Radio – Transceiver operating in 2.4GHz ISM band
•Baseband - Bluetooth link controller which carries out the baseband protocols and other low-level link routines.
•Link Manger – Used for link set-up and control. The signals are interpreted and filtered out by the Link Manager on the receiving side and are not propagated to higher layers.
•Lower HCI – Host Controller Interface, well defined API to control the Bluetooth module
•Physical HCI Transport – UART, RS232, USB
IEEE Wireless 2002 Conference - Seattle2/25/02
Overview of Bluetooth Stack
Upper layers of Bluetooth stack
IEEE Wireless 2002 Conference - Seattle2/25/02
Overview of Bluetooth Stack
Upper layers of Bluetooth stack
•Upper HCI - Host Controller Interface, well defined API to control the Bluetooth module
•L2CAP - Supports higher level protocol multiplexing, packet segmentation and reassembly, and the conveying of quality of service information.
•RFCOMM – Serial port emulation protocol
•SDP – Protocol for locating services provided by or available through a Bluetooth device.
•SCO Manager and Bluetooth Stack Controller are not part of the specification, but generally are components of an upper layer Bluetooth protocol stack.
IEEE Wireless 2002 Conference - Seattle2/25/02
Overview of Bluetooth Stack
IEEE Wireless 2002 Conference - Seattle2/25/02
Typical System Architecture Today
• Lower layers of the stack reside in the Bluetooth hardware (baseband processor and radio) from a silicon or module manufacturer such as TI, Ericsson, Philips, CSR, Taiyo Yuden, Silicon Wave, etc.
• Application, profiles, and upper layers of the stack reside on a separate host processor and communication between upper and lower layers of the stack occurs over the HCI interface.
IEEE Wireless 2002 Conference - Seattle2/25/02
Product Development Areas
• Radio
• Radio and/or Baseband Processor
• Upper Layer Protocol Stack and Profiles
• Application Development
IEEE Wireless 2002 Conference - Seattle2/25/02
Interfaces Available
• Radio – no standard interface defined, company specific
• Radio and/or Baseband Processor – interface between radio and baseband is company specific, but between baseband and upper layer stack, there is the well defined standard HCI interface as part of the Bluetooth spec
• Upper Layer Stack and Profiles – no standard interface to the application developer, each vendors API into the stack is different
• Application Development – vendor specific also
IEEE Wireless 2002 Conference - Seattle2/25/02
Bluetooth Qualification Overview
Current
• Mostly accomplished by manufacturer providing engineering evidence that test case has been successfully completed
• Not many units available for interoperability profile testing
• Lots of questions remain as to what are the minimum requirements for qualification
IEEE Wireless 2002 Conference - Seattle2/25/02
Bluetooth Qualification Overview
Future
• Qualification performed by a third party Bluetooth Qualification Test Facility (BQTF)
• As time goes on, many units will be available for interoperability profile testing
• Fewer unanswered questions about qualification as more Bluetooth products come to market.
IEEE Wireless 2002 Conference - Seattle2/25/02
Summary
• There are several different areas relating to Bluetooth that one could be involved in
• It’s not too late!
• Don’t forget about or minimize the qualification aspect of a Bluetooth product
• Questions??
IEEE Wireless 2002 Conference - Seattle2/25/02
For More Information
www.stonestreetone.com
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