Mobile Communications: Wireless LANs Mobile Communications Chapter 7: Wireless LANs 7.0.1 3ª Parte - Bluetooth.

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Presentation transcript:

Mobile Communications: Wireless LANs Mobile Communications Chapter 7: Wireless LANs ª Parte - Bluetooth

Mobile Communications: Wireless LANs Bluetooth Consortium: Ericsson, Intel, IBM, Nokia, Toshiba - many members Scenarios  connection of peripheral devices loudspeaker, joystick, headset  support of ad-hoc networking small devices, low-cost  bridging of networks e.g., GSM via mobile phone - Bluetooth - laptop Simple, cheap, replacement of IrDA, low range, lower data rates  2.4 GHz, FHSS, TDD, CDMA

Mobile Communications: Wireless LANs States of a Bluetooth device (PHY layer) STANDBY inquirypage connectedtransmit PARKHOLDSNIFF unconnected connecting active low power

Mobile Communications: Wireless LANs Bluetooth MAC layer access codepacket headerpayload bits MAC addresstypeflowARQNSEQNHEC bits Synchronous Connection-Oriented link (SCO)  symmetrical, circuit switched, point-to-point Asynchronous Connectionless Link (ACL)  packet switched, point-to-multipoint, master polls Access code  synchronization, derived from master, unique per channel Packet header  1/3-FEC, MAC address (1 master, 7 slaves), link type, alternating bit ARQ/SEQ, checksum

Mobile Communications: Wireless LANs Scatternets piconets Each piconet has one master and up to 7 slaves Master determines hopping sequence, slaves have to synchronize Participation in a piconet = synchronization to hopping sequence Communication between piconets = devices jumping back and forth between the piconets