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A Simplified Simultaneous Transmit and Receive MAC Proposal

A Simplified Simultaneous Transmit and Receive MAC Proposal. Authors:. Date: 2014-03-17. Abstract. In band STR (Full Duplex) transmission allows 100% increase in Network throughput. Traditional STR transmission require STR AP and STR capable STA.

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A Simplified Simultaneous Transmit and Receive MAC Proposal

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  1. A Simplified Simultaneous Transmit and Receive MAC Proposal Authors: Date: 2014-03-17 Raja Banerjea, CSR

  2. Abstract Raja Banerjea, CSR In band STR (Full Duplex) transmission allows 100% increase in Network throughput. Traditional STR transmission require STR AP and STR capable STA. Earlier we presented a mechanism which supports In Band STR using a STR AP and Half Duplex STAs. In this presentation we propose a simplified MAC mechanism which supports In Band STR

  3. Topics Raja Banerjea, CSR • A simplified STR mechanism • High Level MAC Requirements for In Band STR • A Simplified MAC Proposal for In Band STR • Conclusion

  4. Proposed STR in WLAN • Leverage attenuation and path loss between STAs to develop a simplified STR solution. The increased complexity is only at the Access Point. • Access Point uses knowledge of path loss between STAs to Group STAs for In band STR transmission. Traditional WLAN: Half Duplex transmission In Band STR Proposed Solution Raja Banerjea, CSR

  5. Benefits of simplified In Band STR • 100 % increase in network throughput • No increase in complexity at the STA • Compatible with legacy deployments • Takes advantage of Wall attenuation and Path Loss Raja Banerjea, CSR

  6. High Level MAC Requirements for In Band STR • EDCA based • Coexistence with legacy STAs • Same BSS • OBSS • Simplified solution at the STA • High MAC Efficiency Raja Banerjea, CSR

  7. In Band STR MAC Protocol – Use EDCA Legacy Preamble STR Preamble Payload STA-1 Legacy STR Preamble Payload AP STA-2 • Allows legacy stations to defer based on L-SIG Length • Allows OBSS STAs to defer • Indicates duration of PPDU to STA which would simultaneously transmit • Provides time when the STAs should transmit Acknowledgement Raja Banerjea, CSR

  8. In Band STR MAC Protocol – Use EDCA(opportunistic transmit) Legacy Preamble STR Preamble Payload STA-1 Legacy STR Preamble Payload AP STA-2 • In-Band STR AP can receive packet transmission from STA-1, then it could decide to opportunistically transmit to STA-2. Raja Banerjea, CSR

  9. In Band STR MAC Protocol – Simultaneous Transmit and Receive Legacy Preamble STR Preamble Payload STA-1 STA-2 AP Legacy STR Preamble Payload • Partial AID in the VHT-SIGA1 indicates recipient of PPDU • Group ID / Partial AID of STA2 indicates STA-2 should also transmit • STA-2 should end PPDU transmission before L_LENGTH Duration Raja Banerjea, CSR

  10. In Band STR MAC Protocol – ACKs SIFS Legacy Preamble STR Preamble Payload ACK STA-1 L_LENGTH_DUR + SIFS SIFS STA-2 AP ACK Legacy STR Preamble Payload • Acknowledgement scheme remains unchanged for STA-1 • STA-2 waits for L_LENGTH_DUR + SIFS to receive ACK • In Band STR capable AP can transmit and receive ACK simultaneously • AP Transmit ACK SIFS after end of PPDU transmission Raja Banerjea, CSR

  11. STA Transmit Buffer Status Feedback • AP needs status of transmit buffer at STAs to enable scheduling UL transmission. This could be done using a “1” bit indication in the UL to indicate Tx Buffer Empty or by indicating number of bytes in Tx Buffer. Raja Banerjea, CSR

  12. Conclusion • In band STR can increase the network throughput by 100 % • The simplified In band STR mechanism leverages wall attenuation and path loss between STAs and enables STR where only the Access Point is STR capable. • In Band STR can be used along with MU-MIMO and SU-MIMO and provides increased throughput • The simplified InBand STR MAC scheme proposed uses EDCA mechanism and maintains backward compatibility • In Band STR MAC need not be a complex MAC Raja Banerjea, CSR

  13. References Raja Banerjea, CSR [1]11-13-1421-01-hew-str-radios-and-str-media-access.pptx [2] 11-13-0765-02-0hew-co-time-co-frequency-full-duplex-for-802.11-wlan.pptx [3] 11-13-1122r0-considerations for In-Band Simultaneous Transmit and Receive (STR) feature in HEW

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