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BLUETOOTH TECHNOLOGY Coexistence Of Bluetooth And Wi-Fi

BLUETOOTH TECHNOLOGY Coexistence Of Bluetooth And Wi-Fi. Presented by: JIGAR A. SHAH K.K. Wagh College of Engg. Jigar_a_shah83@yahoo.com YUGA SOMVANSHI K.K. Wagh College of Engg. Coexistence scenario. Overview of Wi-Fi (802.11b). It is specification for WLAN

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BLUETOOTH TECHNOLOGY Coexistence Of Bluetooth And Wi-Fi

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  1. BLUETOOTH TECHNOLOGYCoexistence Of Bluetooth And Wi-Fi Presented by: JIGAR A. SHAH K.K. Wagh College of Engg. Jigar_a_shah83@yahoo.com YUGA SOMVANSHI K.K. Wagh College of Engg.

  2. Coexistence scenario

  3. Overview of Wi-Fi (802.11b) • It is specification for WLAN • Wireless Ethernet Compatibility Alliance certify product as Wi-Fi compatible • Data transmission on BPSK and QPSK • Data transmission at 11 Mbps • Direct Sequence Spread Spectrum (DSSS) • Devices are classified as Access Point and Station • Range of data transmission up to 100m

  4. Frequency occupancy of three Wi-Fi Networks

  5. Overview of Bluetooth • It is WPAN technology • Data transmission on GFSK • Hops at 1600Hz over 79 channels of 1MHz • Uses Frequency Hopping Spread Spectrum (FHSS) • Devices are classified as Master and Slave • Generally used as cable replacement technology • Communication range up to 10m • Data transmission at 724Kbps

  6. Bluetooth frequency occupancy example

  7. What is coexistence ? • “Coexistence”, the ability for multiple protocols to operate in the same frequency band without significant degradation to either’s operation • 2.4GHz ISM band is 83.5MHz wide with lower limit from 2.400GHz and higher limit from 2.4835GHz • Both Bluetooth and Wi-Fi utilizes same 2.4GHz ISM band • Bluetooth device hops over 79MHz channel and Wi-Fi requires 16MHz bandwidth – chances of interference are very high • Wi-Fi and Bluetooth are complementary rather than competing

  8. Testing Notation

  9. Wi-Fi throughput – baseline performance

  10. Bluetooth throughput - baseline

  11. Test -1 with Bluetooth Test – 2 with Bluetooth at 10m Wi-Fi performance with Bluetooth interference – Testing setup

  12. Wi-Fi performance with Bluetooth interference

  13. Bluetooth performance with Wi-Fi interference

  14. Methods for Improved Coexistence • MAC layer switching • Adaptive Fragmentation for Wi-Fi Networks • Transmit Power control • Dynamic Channel Selection for Wi-Fi Network • Adaptive Frequency Hopping for Bluetooth Networks

  15. FCC Regulations for transmitting power • Section 15.247 of FCC regulation specifies high power transmission for FHSS and DSSS • Section 15.247a of FCC regulations limits high power transmitters up to 1 Watt for DSSS and FHSS • Minimum No. of channel to be hopped was 75 in 2002 • To limit transmission power FCC changed min. number of channel to be hopped to 20 channels

  16. Factors on which determination of best channel depends: • Packet error rate • Channel noise • Channel multipath and intersymbol interference • Received signal strength

  17. Wi-Fi and Bluetooth Interference

  18. Adaptive Frequency Hopping (AFH) Example

  19. AFH (Adaptive Frequency Hopping)

  20. Changes in Bluetooth 1.2 specification • AFH is specified in Bluetooth 1.2 specification • Base band: Updated base band describes the algorithm used for generating an adapted hop channel set • LMP (Link Manger Protocol): it is updated with new message for communicating the bit mask that identifies which channel may be used and which are to be avoided • The bit mask consist of 79 bits which gives detail about which channel is to be used and unused • HCI (Host Controller Interface): it includes two new commands ; • First to exclude channels from list • Second one to read channel map currently in use

  21. Limitation of AFH • Not suitable for collocated Wi-Fi and Bluetooth devices, • Effectiveness depends on antenna isolation, transmit power of devices and the sensitivity of receiver • Requires antenna isolation • Cannot be used if either master or slave does not support it • Not effective for Bluetooth 1.1 compatible devices

  22. AFH is used with other coexistence technology • UltimateBlue™ by siliconwave • Intel Wireless Coexistence System (WCS) • Blue802™ technology

  23. Standardization Activities • IEEE 802.15 WPAN has formed different task groups: • TG1 (802.15.1) : reformulating BT 1.x spec into IEEE standards • TG2 (802.15.2) : Recommend practices coexistence of wireless devices operating in the 2.4GHz band • Bluetooth SIG coexistence Working Group is established to make changes in Bluetooth standards

  24. References • Andrew Tanenbaum: Computer networks, fourth edition • Douglas Comer: Computer Networks and Internet • Jennifer Bray, Charles Struman: Bluetooth-connect without cable

  25. www.ti.com/wlan (Texas Instrument) www.wimaxforum.com www.alcatel.com www.stdsbbs.ieee.org/groups/802/11 www.bitpipe.com www.interop.com www.ieee802.org/15 www.bluetooth.org www.codebluecommunication.com www.3com.com www.trillium.com www.motorola.com www.itpapers.com www.siliconwave.com www.wi-fi.org www.mobilian.com www.intel.com Web - References

  26. Thank You! Questions?

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