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TXOP Sharing Operation for Relay

TXOP Sharing Operation for Relay. Date: 2013-03-25. Authors:. Outline. The concept of TXOP sharing for relay to minimize power consumption and number of channel contentions has been presented in [1] Two ACK procedures are accepted for TXOP sharing Explicit ACK [1] Implicit ACK [2]

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TXOP Sharing Operation for Relay

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  1. Eric Wong, Broadcom TXOP Sharing Operation for Relay • Date: 2013-03-25 Authors:

  2. Eric Wong, Broadcom

  3. Eric Wong, Broadcom

  4. Eric Wong, Broadcom

  5. Eric Wong, Broadcom Outline • The concept of TXOP sharing for relay to minimize power consumption and number of channel contentions has been presented in [1] • Two ACK procedures are accepted for TXOP sharing • Explicit ACK [1] • Implicit ACK [2] • This proposal elaborates on the rules for TXOP operation • Proposed to use a new bit for the purpose of operating within a relay shared TXOP

  6. Eric Wong, Broadcom Signaling for Relay TXOP • Relayed Frame field • 1-bit to indicate if a frame is relayed within a TXOP • For ACK and CTS frame, a similar bit is also needed in the Frame Control field and NDP SIG • If this bit is set in an initiating frame (e.g. DATA), then it is a capability indication for implicit ACK • If this bit is set in a responding frame (e.g. ACK, CTS), then it indicates relay shall share the TXOP and continue to transmit the frame over the next hop after SIFS • The choice of which ACK procedure is decided by the Relay More Data Protocol Version Type From DS More Fragments PowerMgmt Protected Frame EOSP Relayed Frame 1 TID Bits: 3 1 4 1 2 1 1 1 1 Frame Control field in short MAC header

  7. Eric Wong, Broadcom Downlink with Explicit ACK AP sends downlink DATA frame with response frame bits set to 00to relay After receipt of ACK, AP removes frame from buffer, and defers MAX_PPDU + ACK + 2*SIFS before next event RelayedFrame=X AckInd=00 Relay sends ACK, and set response frame bits to 11 for next outgoing frame DATA RelayedFrame=1 AckInd=11 DATA SIFS AP SIFS RelayedFrame=0 AckInd=10 ACK RelayedFrame=0 AckInd=00 SIFS In SIFS time, relay sends DATA with a different MCS and response frame bits set to 00. Relay buffers frame until successful delivery or reaching of retry limit RELAY ACK STA

  8. Eric Wong, Broadcom Downlink with Implicit ACK AP sends downlink DATA frame with response frame bits set to 11, so that other STAs can expect another DATA frame will follow Within SIFS time, AP receives a PHY SIG field with response frame bits set to 00, and checks next-hop PAID in PHY SIG field RelayedFrame=1 AckInd=11 DATA DATA SIFS AP SIFS RelayedFrame=0 AckInd=10 Relay sends DATA with a different MCS, and sets response frame bits to 00 RelayedFrame=0 AckInd=00 RELAY ACK STA

  9. Eric Wong, Broadcom Uplink with Explicit ACK RelayedFrame=0 AckInd=10 Relay sends ACK, and set response frame bits to 11 for next outgoing frame DATA RelayedFrame=1 AckInd=11 ACK SIFS AP ACK RelayedFrame=0 AckInd=00 SIFS In SIFS time, relay sends DATA with a different MCS and response frame bits set to 00. Relay buffers frame until successful delivery or reaching of retry limit RELAY STA sends uplink DATA frame with response frame bits set to 00to relay RelayedFrame=X AckInd=00 After receipt of ACK, STA removes frame from buffer, and defers MAX_PPDU + ACK + 2*SIFS before next event DATA STA SIFS

  10. Eric Wong, Broadcom Uplink with Implicit ACK RelayedFrame=0 AckInd=10 Relay sends DATA with a different MCS, and sets response frame bits to 00 DATA ACK SIFS AP RelayedFrame=0 AckInd=00 Within SIFS time, STA receives a PHY SIG field with response frame bits set to 00, and checks next-hop PAID in PHY SIG field RELAY STA sends uplink DATA frame with response frame bits set to 11, so that other STAs can expect another DATA frame will follow RelayedFrame=1 AckInd=11 DATA STA SIFS

  11. Eric Wong, Broadcom TXOP Sharing Operation • When a Relay receives a valid frame, the Relay may response with • An Implicit ACK in next-hop transmission after SIFS, if Relay has received Relayed Frame bit set to 1 • An ACK after SIFS with Relayed Frame bit set to 1, and continue with next-hop DATA transmission after SIFS • An ACK after SIFS with Relayed Frame bit set to 0, and does not continue to use the remaining TXOP • A relay may set Relayed Frame bit to 1 only if it has received a More Data bit set to 0.

  12. Eric Wong, Broadcom Conclusion • Proposed to define a new Relayed Frame bit for operation within a relay shared TXOP.

  13. Eric Wong, Broadcom Straw Poll 1 • Do you support a Relayed Frame bit in the Frame Control field for TXOP operation in slide 11? • Yes • No • Abstain

  14. Eric Wong, Broadcom Straw Poll 2 • Do you support a Relayed Frame bit in the NDP ACK SIG field for TXOP operation in slide 11? • Yes • No • Abstain

  15. Eric Wong, Broadcom References • [1] E. Wong et al., “Two-Hop Relay Function,” IEEE 11-12/1330r0 • [2] Y. Kwon et al., “Implicit ACK for Relay,” IEEE 11-13/0075r0

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