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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 - PowerPoint PPT Presentation
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Mini Course
Programming Context-aware Mobile Phones
Thomas Bodin
IT University of Copenhagen
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Tuesday agenda
General Bluetooth concepts Definition Overview Core specifications
Introduction to BlipNet API
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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.
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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.
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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
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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.
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General Bluetooth concepts
RF
BB LMPHCIL2CAP
SDP RFCOMM BNEPTCS
OBEX PPP
IP
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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
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General Bluetooth concepts
Profile
RF
BB LMPHCIL2CAP
SDP BNEPTCS RFCOMM
OBEX PPP
IP
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Service Discovery Application Profile
Service Search
LAN Access Profile,Object Push ProfilePAN Profile (NAP)
Service Search
Service Search
RF
BB LMP
L2CAP
SDP BNEPTCS RFCOMM
OBEX PPP
IP
SDAP Profile
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Serial Port Profile
AT Command
RF
BB LMP
L2CAP
SDP BNEPTCS RFCOMM
OBEX PPP
IP
SPP Profile
Serial cable replacement
Basis profile for a series of other profiles
Can be applied directly for data communication
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Dial-Up Networking Profile
DUN- GWDUN Client
Internet
RF
BB LMP
L2CAP
SDP BNEPTCS RFCOMM
OBEX PPP
IP
Dial-UP Networking Profile
Cellular phone acts a wireless modem for connecting to a dial-up internet access server etc.
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Object Push Profile
RF
BB LMP
L2CAP
SDP BNEPTCS RFCOMM
OBEX PPP
IP
OPP Profile
Buisness CardEricssonBluetooth Networks
Business CardMr SmithStreet X, Town Y
Sound
ImageVideo
Game
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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
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BlipManager
Graphical configuration and monitoring of the BlipServer and BlipNodes
Presets for standard configuration Configuration wizards Configuration groups Central controlled security
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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