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Slot-based Power Save without PS-Poll

Date: July, 2012. Slot-based Power Save without PS-Poll. Date: 2012-07-12. Authors:. Recap of Response Frame Rate Selection. A frame from a TXOP holder decides the unique response frame from the TXOP responder, e.g. RTS + CTS, BlkAckReq + BlkAck, data MPDU + ACK…

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Slot-based Power Save without PS-Poll

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  1. Date: July, 2012 Slot-based Power Save without PS-Poll Date: 2012-07-12 Authors: Liwen Chu Etc.

  2. Recap of Response Frame Rate Selection A frame from a TXOP holder decides the unique response frame from the TXOP responder, e.g. RTS + CTS, BlkAckReq + BlkAck, data MPDU + ACK… Without beamforming training, a TXOP holder can calculate the content of the Duration/ID field. The rate/MCS of the response frame is strictly defined. With TGac beamforming training, a TXOP responder can select rate/MCS of VHT Compressed Beamforming report without considering the rate/MCS of the preceding NAPA/Beamforming Report Poll. This July increase the chance of successful reception of VHT Compressed Beamforming report. The VHT TXOP holder can’t calculate the content of the Duration/ID field in this case. In TGah, similar rules should be defined: Without beamforming training, a TXOP holder can calculate the content of the Duration/ID field. The same rate/MCS rules for the response frames should be used. But, these rules are not enough to calculate the duration.

  3. TGah Possible New Frame Sequence TGah defines new frame formats to decrease the MAC layer overhead: the data/management frames with compressed header (the compressed data/management frames), short-CTS, and short-ACK. The compressed data/management frames don’t have a Duration/Id field. But the STAs for indoor applications July not support the short control/data/management frames. The following new frame sequences are possible: compressed data/management frame + short-ACK, compressed data/management frame + ACK, Data/management frame + short-ACK, RTS + short-CTS, A-MPDU with compressed data/management frames + BlkAck. Should TGah allow all these frame sequences?

  4. Why Definitive Frame Sequences are Important Definitive frame sequences make medium access fair and efficient. The TXOP holder can calculate the content of the Duration/ID field. STA2 STA4 STA3 STA1 Compressed Data with ACK Ind Short-ACK Should I start backoff based on Short-ACK or normal ACK? STA1 can’t detect STA3’s transmission, and STA4 can’t detect STA4’s transmission.

  5. TGah Possible Frame Sequence Discussion “compressed data/management frame + short-ACK”: There is no Duration/ID field in compressed data/management frame. The Duration/Id field in the following ACK/short-ACK should be defined. The Duration/Id field in ACK/short-ACK following compressed data/management frame shall be set to 0. “compressed data/management frame + ACK”: “compressed data/management frame + ACK” shall not be used since “compressed data/management frame + short-ACK” is more efficient. “A-MPDU with compressed data frames + BlkAck”: There is no Duration/ID field in A-MPDU with short data frames. The Duration/Id field in BlkAck “A-MPDU with short data frames + BlkAck” should be defined. The Duration/Id field in BlkAck “A-MPDU with short data frames + BlkAck” shall be set to 0.

  6. TGah Possible Frame Sequence Discussion (Cont’d) “RTS + short-CTS”: “RTS + short-CTS” is efficient than “RTS + CTS” and “RTS + short-CTS” can also provide NAV protection. But “RTS + short-CTS” can’t be used for link adaptation, beamforming training. “RTS + short-CTS” shall be used if link adaptation or beamforming training is not executed. “data/management frame + short-ACK”: “data/management frame + short-ACK” is efficient than “data/management frame + ACK”. But “data/management frame + short-ACK” can’t be used for link adaptation, beamforming training. data/management frame +short- ACK shall be used if link adaptation or beamforming training is not executed. Why is this required? In a TXOP after A-MPDU with data frame + BlkAck, the TXOP holder is easy to transmit unsuccessful data MPDU and the TXOP responder responds with short-ACK. If Duration/ID is added to compressed data/management frames, “data/management frame + short-ACK” is not necessary.

  7. TGah Response Frame Rules Option 1 This option assumes that all TGah STAs are able to transmit and receive compressed data/management frames and short control frames: Short-ACK shall follow a compressed data/management frame. Short-ACK shall not follow a data/management frame when the data/management frame is used for link adaptation. Otherwise, if the data/management frame is not used for link adaptation, Short-ACK shall be used. Short-CTS shall not follow RTS, if RTS is used for link adaptation. Otherwise, if RTS is not used for link adaptation, Short-CTS shall be used.

  8. TGah Response Frame Rules Option 2 This option assumes that some TGah STAs are not able to transmit and receive the compressed data/management frames and the short control frames. When a TXOP holder and the TXOP responder have the abilities to transmit and receive the compressed data/management frames and the short control frames as indicated by Extend Capabilities or other new IE: the TXOP responder shall respond Short-ACK if compressed data/management frame is received. the TXOP responder shall not respond Short-ACK if the received data/management frame is used for link adaptation. Otherwise, if the data/management frame is not used for link adaptation, Short-ACK shall be used. the TXOP responder shall not respond Short-CTS if the received RTS is used for link adaptation. Otherwise, if the RTS is not used for link adaptation, Short-CTS shall be used.

  9. TGah Response Frame Rules Option 2 (cont’d.) When the TXOP responder supports transmitting and receiving compressed data/management frames and short control frames as indicated by Extend Capabilities (or other new IE), a TXOP holder July transmit compressed data/management frames.

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