Bluetooth
description
Transcript of Bluetooth
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Bluetooth Vishwas Sundaramurthy
Low-cost, short range, small form-factor radio linksAdhoc networks/links between information appliances
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History
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Usage Scenarios Automatic backup synchronization Connect peripherals to PC / LAN E-mail synchronization Hands-free phone Instant photos Interactive conference Ubiquitous internet access
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Three in One Phone
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Automatic Backup Synchronization
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Connect Peripherals to PC / LAN
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E-mail Synchronization
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Hands-free Phone
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Instant Photos and Video Clips
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Interactive Conference
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Ubiquitous Internet Access
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Overview Allows replacement of proprietary cables Adhoc grouping (piconets) Combination of circuit and packet
switching Avoids interference using freq hopping
spread spectrum and FEC Asynchronous connectionless - data
channel (721/57.6kb/s) Synchronous connection oriented - voice
(432 kb/s)
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Radio Interface 1mb/s raw throughput (actual 728 kb/s) 2.402 GHz to 2.480 GHz, frequency
hopping 79 hops displaced by 1 MHz
RF output signal power of 1 mw (0 dBm, class 3) up to 100 mw
10 meters in low-power standard (100 in high)
Time Division Duplex
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Bluetooth Link Manager Link setup, authentication, link
configuration protocols Discover remote LMs Naming/authentication Connection setup Link modes (voice/data)
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Bluetooth Topology
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Bluetooth Baseband Each packet (0.635 s) in a different
hop freq (1600 hops/s). Link establishment Standby/sniff/park/hold mode Link types
Synchronous connection oriented (SCO) asynch connection-less (ACL)
Error correction 1/3 FEC, 2/3 FEC and ARQ
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Form Factor
Ericsson Bluetooth Module Ericsson Bluetooth Radio
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Sources www.bluetooth.net www.bluetooth.com bluetooth.ericsson.se www.nokia.com/phones/bluetooth