Bluetooth technology coexistence of bluetooth and wi fi
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BLUETOOTH TECHNOLOGY Coexistence Of Bluetooth And Wi-Fi. Presented by: JIGAR A. SHAH K.K. Wagh College of Engg. [email protected] 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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Bluetooth technology coexistence of bluetooth and wi fi

BLUETOOTH TECHNOLOGYCoexistence Of Bluetooth And Wi-Fi

Presented by:

JIGAR A. SHAH

K.K. Wagh College of Engg.

[email protected]

YUGA SOMVANSHI

K.K. Wagh College of Engg.


Coexistence scenario

Coexistence scenario


Overview of wi fi 802 11b

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


Frequency occupancy of three wi fi networks

Frequency occupancy of three Wi-Fi Networks


Overview of bluetooth

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


Bluetooth frequency occupancy example

Bluetooth frequency occupancy example


What is coexistence

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


Testing notation

Testing Notation


Wi fi throughput baseline performance

Wi-Fi throughput – baseline performance


Bluetooth throughput baseline

Bluetooth throughput - baseline


Wi fi performance with bluetooth interference testing setup

Test -1 with Bluetooth

Test – 2 with Bluetooth at 10m

Wi-Fi performance with Bluetooth interference – Testing setup


Wi fi performance with bluetooth interference

Wi-Fi performance with Bluetooth interference


Bluetooth performance with wi fi interference

Bluetooth performance with Wi-Fi interference


Methods for improved coexistence

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


Fcc regulations for transmitting power

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


Factors on which determination of best channel depends

Factors on which determination of best channel depends:

  • Packet error rate

  • Channel noise

  • Channel multipath and intersymbol interference

  • Received signal strength


Wi fi and bluetooth interference

Wi-Fi and Bluetooth Interference


Adaptive frequency hopping afh example

Adaptive Frequency Hopping (AFH) Example


Afh adaptive frequency hopping

AFH (Adaptive Frequency Hopping)


Changes in bluetooth 1 2 specification

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


Limitation of afh

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


Afh is used with other coexistence technology

AFH is used with other coexistence technology

  • UltimateBlue™ by siliconwave

  • Intel Wireless Coexistence System (WCS)

  • Blue802™ technology


Standardization activities

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


References

References

  • Andrew Tanenbaum: Computer networks, fourth edition

  • Douglas Comer: Computer Networks and Internet

  • Jennifer Bray, Charles Struman: Bluetooth-connect without cable


Web references

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


Thank you

Thank You!

Questions?


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