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Implicit ACK for Relay. Authors:. Date: 2013-01-14. Authors:. Authors:. Background. AP sends downlink DATA frame with response frame bits set to 00 to relay. After receipt of ACK, AP removes frame from buffer, and defers MAX_PPDU + ACK + 2*SIFS before next event. T D (V 2 ).

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implicit ack for relay
Implicit ACK for Relay

Authors:

Date: 2013-01-14

Young Hoon Kwon, Huawei

slide2

Authors:

Young Hoon Kwon, Huawei

slide3

Authors:

Young Hoon Kwon, Huawei

background
Background

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

TD(V2)

Relay sends ACK, and set response frame bits to 11 for next outgoing frame

RspFrm=00

DATA

TA(V2)

TD(V1)

RspFrm=11

DATA

SIFS

AP

SIFS

ACK

RspFrm=10

RspFrm=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

TA(V1)

ACK

STA

Young Hoon Kwon, Huawei

TGah accepted the concept of sharing one TXOP for relay (for explicit ACK exchange) to reduce the number of channel contentions [1, 2].

proposed scheme
Proposed Scheme

To further improve MAC efficiency, we propose a single TXOP forwarding scheme without an ACK frame from Relay Station without increasing uncertainty.

Young Hoon Kwon, Huawei

proposed scheme1
Proposed Scheme
  • The source station identifies if following packet is relay station’s forwarding packet by checking the SIG field of the following packet.
    • 9bit PAID subfield is defined for 2MHz SIG field.
    • When a relay station forwards a received packet to a destination station, the destination station’s PAID shall be included in the PAID subfield.
    • If the source station knows the destination station’s PAID, the source station can identify that following packet is relay station’s forwarding packet, by checking the PAID subfield of the following packet’s SIG field.
    • Therefore, the source station can check its transmission success or not by checking SIG field of following packet only without decoding data payload part.

Young Hoon Kwon, Huawei

proposed scheme2
Proposed Scheme

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 PAID subfield in PHY SIG field

RspFrm=11

DATA

DATA

SIFS

AP

SIFS

Relay sends DATA with a different MCS, and sets response frame bits to 00, and sets PAID subfield to that of the STA

RspFrm=10

RspFrm=00

RELAY

ACK

STA

DL example

Young Hoon Kwon, Huawei

proposed scheme3
Proposed Scheme

RspFrm=10

Relay sends DATA with a different MCS, and sets response frame bits to 00, and sets PAID subfield to that of the AP

DATA

ACK

SIFS

AP

RspFrm=00

Within SIFS time, STA receives a PHY SIG field with response frame bits set to 00, and checks PAID subfield 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

RspFrm=11

DATA

STA

Young Hoon Kwon, Huawei

UL example

SIFS

requirements
Requirements
  • An AP needs to know PAID of STAs belong to the relay station for downlink transmission.
    • Relay station needs to indicate a STA’s PAID to the root AP, when the STA is associated or the STA’s AID is changed.
  • A STA associated with a relay station needs to know PAID of the root AP for uplink transmission.
    • Relay station needs to indicate associated STAs BSSID of the root AP.
    • Current SFD already includes similar feature for R-AP:
      • R-AP is able to indicate it is a R-AP (1 bit or indicate root-AP address/SSID in beacon, TBD)

Young Hoon Kwon, Huawei

straw polls
Straw Polls
  • SP1
    • Do you support the concept of sharing one TXOP for relay with implicit ACK, where PAID in SIG field is used for ACK purpose as shown in slide 6?
  • SP2
    • Do you support that relay station indicates an associated STA’s PAID to root AP when the STA becomes associated or the STA’s AID is changed, and indicates the BSSID of the root AP to newly associated STAs?
      • And the BSSID of the root AP can be indicated in beacon frame.

Young Hoon Kwon, Huawei

references
References

[1] IEEE 802.11-11/1137r12 Proposed Specification Framework for TGah

[2] IEEE 802.11-12/1330r0 Two-hop relay function

Young Hoon Kwon, Huawei

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