The HE (QoS) null data frame could be another candidate Generally STA transmits the Null data frame to initiate the power saving mode by setting power management subfield to 1 to minimize the PPDU overhead In the similar way, STA may send it with HE SU PPDU by setting Doppler bit to 1 anytime as stand-alone frame. ![]() ![]() lowest MCS, mid-amble inserted every 10 OFDM symbols) for the STA. It is not likely urgent that next upcoming data frame should be more secured than the current data frame we’ve just successfully received Or in order to make next data frame more reliable, it might be transmitted with conservative M and MCS very inefficiently 1 bit Doppler indication does not provide enough information for efficient transmission AP shall acquire the transmit address in MAC header to know which STA is under time varying channel The receiver may transmit the next data frame with unnecessarily large overhead (e.g. “urgent need indicating Doppler” in responding ACK/BA frame. Contradiction between “decoding data successfully” vs. Yujin Noh, NewracomĪ HE ACK/BA frame could be a short control frame. AP shall acquire the transmit address in MAC header to know which STA is under time varying channel AP may send the buffered data with Mid-amble inserted in response for the STA known as being suffering Doppler-driven environment. When the STA is in power management, it sends the HE PS-poll frame to request AP to send a buffered frame indicated by Beacon frame. It remains awaken until AP transmits Ack/BA before the STA goes into the sleep state. The STA sends a frame to AP to indicate power management is enabled. Yujin Noh, NewracomĪ HE PS-poll frame may be a short control frame Since the PS-poll frame is not a stand-alone frame, it usually requires the pre-defined procedure between AP and STA first. PAID, Color), it has been allowed only in a case that the corresponding function of MAC information is supposed to be totally transferred to PHY layer in order to significantly reduce the decoding time Even though RX obtains Doppler information in PHY, transmit address in MAC of the received PPDU is still important to know which TX is under Doppler circumstance for the next transmission. WLAN has never allowed cross-layer distribution of the needed information for a single function. Even in exception, at least that control information should be effective and valid when needed for RX. The SIG consists of control information fields to interpret and decode the received PPDU. Normative behavior of both AP and STA are clearly expected when receiving the information on SIG field(s). Yujin Noh, NewracomĤ Considerations 802.11 PHY/MAC design philosophy, ![]() HE PS-poll frame HE ACK/BA frame HE (QoS) null data frame We will revisit three short packets later to analysis on the operation of Usage 2. Yujin Noh, Newracomģ Background (2/2) There are some examples of the proper PPDU (e.g. Usage 2) When NSYM is not larger than M, extra usage of Doppler bit in HE-SIG-A was discussed in order to indicate whether channel is time varying for RX. Usage 1) When NSYM is larger than the mid-amble duration (M), proper value and how to signal of M and corresponding equations (NMA) at TX and (NMA, NSYM and TPE) RX have been suggested. ![]() Warren Ave Fremont, CA 94538 sigurd at Yujin Noh, Newracom John Doe, Some CompanyĢ Background (1/2) For 11ax, the Mid-amble design has been introduced by setting Doppler bit in HE-SIG-A to 1. Irvine, CA 92618 yujin.noh at Minho Cheong minho.cheong at Sigurd Schelstraete Quantenna 3450 W. Month Year doc.: IEEE yy/xxxxr0 Usage of Doppler bit in A-Control subfield Date: Authors: Name Affiliation Address Phone Yujin Noh Newracom 9008 Research Dr. Presentation on theme: "Usage of Doppler bit in A-Control subfield"- Presentation transcript:ġ Usage of Doppler bit in A-Control subfield
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |