Doc.:IEEE 802.11-11/0037r0 Submission Jan. 17, 2011 Yong Liu, MarvellSlide 1 BW Indication in Non-HT Frames Date: 2011-01-17 Authors:

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doc.:IEEE /0037r0 Submission Jan. 17, 2011 Yong Liu, MarvellSlide 1 BW Indication in Non-HT Frames Date: Authors:

doc.:IEEE /0037r0 Submission Jan. 17, 2011 Yong Liu, MarvellSlide 2 Motivation Control response BW selection –A STA that receives a frame that elicits a control frame transmission (other than CTS frame) shall send the response frame using the same channel bandwidth as the received frame When a VHT STA receives a non-HT PPDU (or non-HT duplicate PPDU) that elicits a control frame transmission, how does the VHT STA tell the BW of the received non- HT PPDU (or non-HT duplicate PPDU), and decide the BW of the control response transmission?

doc.:IEEE /0037r0 Submission Jan. 17, 2011 Yong Liu, MarvellSlide 3 Examples RTS ⇒ CTS BAR ⇒ BA –BAR can be transmitted by using non-HT (duplicate) PPDU for lower overhead and channel access protection –BAR receiver needs to know the BW of BAR to decide the BW of BA transmission CF-END (from non-AP STA) ⇒ CF-END (from AP) –CF-END shall be transmitted by using non-HT (duplicate) PPDU –When AP receives a CF-END from a non-AP STA, and decides to transmit a CF-END also, it needs to know the BW of the received CF-END Sounding Poll ⇒ Sounding Feedback –Sounding Poll can be transmitted by using non-HT (duplicate) PPDU for lower overhead and channel access protection –Sounding Poll receiver needs to know the BW of the Sounding Poll frame to decide the BW of sounding feedback transmission

doc.:IEEE /0037r0 Submission Jan. 17, 2011 Yong Liu, MarvellSlide 4 Pre-motion Should the spec framework document be updated with the following BW indication rule? –A VHT STA that transmits a control frame carried in non-HT or non-HT duplicate format and addressed to a VHT STA and eliciting a control frame transmission or a sounding feedback management frame transmission shall set the INDICATED_CH_BANDWIDTH TXVECTOR parameter of the control frame to the same value as the CH_BANDWIDTH TXVECTOR parameter and shall set the Individual/Group bit in the TA field to 1. Yes No Abstain