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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

Eric Wong, Broadcom

TXOP Sharing Operation for Relay

  • Date: 2013-03-25

Authors:





Outline

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


Signaling for relay txop

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


Downlink with explicit ack

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


Downlink with implicit ack

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


Uplink with explicit ack

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


Uplink with implicit ack

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


Txop sharing operation

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.


Conclusion

Eric Wong, Broadcom

Conclusion

  • Proposed to define a new Relayed Frame bit for operation within a relay shared TXOP.


Straw poll 1

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


Straw poll 2

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


References

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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