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Mini Course

Mini Course. Programming Context-aware Mobile Phones Thomas Bodin IT University of Copenhagen. Tuesday agenda. General Bluetooth concepts Definition Overview Core specifications Introduction to BlipNet API. General Bluetooth concepts. Definition

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Mini Course

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  1. Mini Course Programming Context-aware Mobile Phones Thomas Bodin IT University of Copenhagen

  2. Tuesday agenda • General Bluetooth concepts • Definition • Overview • Core specifications • Introduction to BlipNet API

  3. General Bluetooth concepts • Definition • A short-range wireless communication technology for voice and data. Bluetooth communicates via a frequency hopping transceiver in the ISM band. It is based on a low-cost short-range radio link facilitating protected ad hoc connections for stationary and mobile communication.

  4. General Bluetooth concepts • Overview • The Bluetooth wireless connectivity technology was originally envisioned in 1994 by the Swedish phone equipment maker Ericsson as a way for mobile devices to communicate with each other at short ranges -- up to 30 feet, or 10 meters. In 1998, Ericsson, IBM, Intel, Nokia, and Toshiba formed the Bluetooth Special Interest Group consortium to develop a royalty-free, open specification for short-range wireless connectivity. Since then, more than 2000 companies have joined the Bluetooth SIG, including virtually all manufacturers of phone, computer, and PDA equipment.

  5. General Bluetooth concepts • Core specifications • 2.4 GHz ISM Open band • Bluetooth divides the 2.4 GHz frequency band into 79 channels 1 MHz apart (from 2.402 to 2.480 GHz), • The frequency hopping is carried out up to 1600 times a second • 10 cm-10 meters range (can be extended to 100 m) • 8 active devices per piconet (share datarate) • Up to 10 piconets in bubble (full datarate) • 1 Megabyte per second gross rate • Bluetooth defines provisions for three low-power operating modes in order to conserve battery life: sniff, park and hold mode

  6. General Bluetooth concepts • Core specifications (continued) • 802.15 vs. 802.11 • While both Bluetooth and IEEE 802.11b are wireless communication protocols and both operate in the 2.4GHz band, it is important not to visualize Bluetooth as a replacement for 802.11 wireless LAN technology. • The 802.11b protocol is designed to connect relatively large devices with lots of power and speed, such as desktops and laptops. Devices communicate at up to 11 Mbit/sec, at greater distances (up to 300 feet, or 100 meters). By contrast, Bluetooth is designed to connect small devices like PDAs, mobile phones, and peripherals at slower speeds (1 Mbit/sec), within a shorter range (30 feet, or 10 meters), which reduces power requirements.

  7. HCI General Bluetooth concepts IP PPP OBEX SDP TCS RFCOMM BNEP L2CAP BB LMP RF

  8. General Bluetooth concepts • The radio layer is the physical wireless connection • The baseband layer is responsible for controlling and sending data packets over the radio link • The baseband layer maintains Synchronous Connection-Oriented (SCO) links for voice and Asynchronous Connectionless (ACL) links for data • The Link Manager Protocol (LMP) uses the links set up by the baseband to establish connections and manage piconets. • The Host Controller Interface (HCI) is the dividing line between software and hardware. • The Logical Link Control and Adaptation Protocol (L2CAP) receives application data and adapts it to the Bluetooth format

  9. General Bluetooth concepts Profile IP PPP OBEX SDP TCS RFCOMM BNEP L2CAP HCI BB LMP RF

  10. Service Discovery Application Profile Service Search SDAP Profile LAN Access Profile, Object Push Profile PAN Profile (NAP) Service Search IP PPP OBEX SDP TCS RFCOMM BNEP Service Search L2CAP BB LMP RF

  11. Serial Port Profile AT Command SPP Profile IP PPP OBEX SDP TCS RFCOMM BNEP Serial cable replacement Basis profile for a series of other profiles Can be applied directly for data communication L2CAP BB LMP RF

  12. Dial-Up Networking Profile DUN- GW DUN Client Dial-UP Networking Profile IP Internet PPP OBEX SDP TCS RFCOMM BNEP L2CAP Cellular phone acts a wireless modem for connecting to a dial-up internet access server etc. BB LMP RF

  13. Object Push Profile Buisness Card Ericsson Bluetooth Networks OPP Profile IP Business Card Mr Smith Street X, Town Y PPP OBEX Sound Game SDP TCS RFCOMM BNEP Video Image L2CAP BB LMP RF

  14. BlipServer • Configuration and management of BlipNodes • Central security handler • Link and session establishment controller • Payload gateway for OBEX and SPP data • Linux and Windows • BlipNet API • BlipServer configuration via BlipManager

  15. BlipManager • Graphical configuration and monitoring of the BlipServer and BlipNodes • Presets for standard configuration • Configuration wizards • Configuration groups • Central controlled security

  16. BlipNet API • An Open RMI based Java API • Monitoring of BlipNet (Event and Poll based) • Configuration of dynamic BlipNode settings • Send/Receive objects (OBEX) • Send/Receive serial data • Dynamic Class loading • Inquiry start/stop from API • Friendly Name lookup event

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