Improving Bluetooth EDR Data Throughput Using FEC and Interleaving

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Presentation transcript:

Improving Bluetooth EDR Data Throughput Using FEC and Interleaving Ling-Jyh Chen*, Tony Sun**, Yung-Chih Chen* *Institute of Information Science, Academia Sinica **Dept. of Computer Science, UCLA

Introduction Wireless communication is inherently vulnerable to errors. Wireless channel errors are usually bursty and dependent in occurrences rather than independently/ identically distributed. Some robust link layer transmission schemes are required.

Contribution We propose three link layer enhancements for Bluetooth v2.0 Adaptive Packet Type (APT) FEC coding Interleaving FEC (IFEC) The proposed solutions are applicable to other wireless technologies.

Outline Bluetooth Overview Proposed Link Layer Enhancements Simulation Results Conclusion

Asymmetric Throughput (kbps) Bluetooth Overview The “enabler” of Personal Area Network (PAN) Low power, low cost, and smaller chips Mode FEC Packet Asymmetric Throughput (kbps) Size (bytes) Length (slots) DM1 yes 17 1 108.8 DM3 121 3 387.2 54.4 DM5 227 5 477.8 36.3 DH1 no 27 172.8 DH3 183 585.6 86.4 DH5 339 723.2 57.6

Bluetooth packet types DH: Stop and Wait ARQ DM: ARQ as well as FEC codes FEC coding scheme: (15, 10) Shortened Hamming code Able to correct single bit error in each block.

Bluetooth Enhanced Data Rate (EDR) EDR does not provide FEC enabled packet types (ie., no DM series types)

Proposed Link Layer Enhancements Adaptive Packet Type (APT) FEC coding Interleaving FEC (IFEC)

Enhancement (I): APT Adaptive Packet Type (APT) Determine optimal packet type T: Theoretical Data throughput s: packet size/bits b: bit error rate p: packet error rate n: packet length in Bluetooth slots

Enhancement (I): APT (Con’t)

Enhancement (II) : FEC Propose to apply FEC to Bluetooth EDR Called 2DM1/3/5 & 3DM1/3/5 (15,10) shortened Hamming code that is able to correct single bit error Packet Error Rate : ( p: packet error rate, b: bit error rate s: packet size/bits )

Enhancement (II) : FEC (Con’t)

Enhancement (III) – IFEC Wireless errors are mostly bursty in presence, previous techniques should be modified. Propose Interleaved FEC (IFEC) coding Called DMI 1/3/5, 2DMI 1/3/5, and 3DMI 1/3/5 Burst Error Model (aka Gilbert-Elliott model)

Enhancement (III) – IFEC (Con’t) FEC coding Interleaved FEC coding

Simulation Results Gilbert-Elliott model: Pgb= 0.005, Pbb from 0.9 to 0.9999 FEC coding IFEC coding

Conclusion We proposed three link layer enhancement techniques (APT/FEC/IFEC) for BT EDR. We verified the proposed techniques using simulation. The proposed solutions are applicable to other wireless technologies.

Thank you !