Abstract: Certain aspects relate to methods and apparatus for wireless communication. The apparatus generally includes a processing system configured to generate a first frame including an indication of unused resources in a first basic service set (BSS) available to be shared with one or more wireless nodes in one or more second BSSs. The apparatus also includes a first interface configured to output the first frame for transmission to the one or more wireless nodes.

Abstract: Methods for preparing bioprosthetic tissue are provided. In some instances, bioprosthetic tissue is treated to remove antigenic biomolecules. In some instances, prepared bioprosthetic tissues are incorporated into a medical device.

Abstract: This disclosure provides methods, devices and systems for improving wireless communications in power spectral density (PSD)-limited frequency bands. A wireless communication device, having a number (NTX) of transmit antennas, parses a physical layer (PHY) protocol data unit (PPDU) into a number (NSS) of spatial streams and modulates the NSS spatial streams on a number (M) of subcarriers. In some implementations, the wireless communication device may transmit the PPDU using a number (N) of the transmit antennas, where NSS?N<NTX. In some other implementations, the wireless communication device may subdivide the M subcarriers into subcarrier groups and may transmit each subcarrier group using a respective subset of the NTX transmit antennas, where the number of transmit antennas used to transmit each subcarrier group is greater than or equal to the number of spatial streams modulated on the subcarriers in the group but less than NTX.

Abstract: This disclosure provides methods, devices and systems for increasing the transmit power of wireless communication devices operating on power spectral density (PSD)-limited wireless channels. Some implementations more specifically relate to signaling in a trigger frame to support distributed transmissions via distributed resource units (dRUs). In some implementations, an access point (AP) may transmit a trigger frame soliciting a trigger-based (TB) physical layer convergence protocol (PLCP) protocol data unit (PPDU) from a wireless station (STA), where the trigger frame carries RU allocation information identifying a distributed resource unit (dRU) allocated for the STA and carries tone mapping information indicating a selected spreading bandwidth design for the wireless channel or subchannel. The AP can support channel puncturing by selecting a particular spreading bandwidth design that controls how dRUs are mapped to non-contiguous tones spanning respective spreading bandwidths.

Abstract: In some implementations, a transmitting UWB device may determine a number of information bits of a payload to communicate via UWB. The transmitting UWB device may select, based on the number of information bits, a codeword length from a selection of available codeword lengths with which to encode the payload using a low-density parity-check (LDPC) encoding scheme, wherein the selection of available codeword lengths include a first codeword length, a second codeword length, and a third codeword length, wherein the third codeword length is longer than the second codeword length, which is longer than the first codeword length. The transmitting UWB device may transmit the payload using one or more codewords having the selected codeword length.

Abstract: This disclosure provides methods, components, devices and systems for extending distributed resource units (dRUs) beyond 80 MHz. Some aspects more specifically relate to supporting enhanced tone distribution mapping schemes and signaling. In some examples, a wireless station may receive, from an access point, scheduling information for a physical layer (PHY) protocol data unit (PDU) (PPDU) to be transmitted by one or more wireless stations including the wireless station over a wireless channel. The scheduling information may indicate one or more dRUs within the wireless channel, each dRU comprising a respective set of tones distributed across a distribution bandwidth of the wireless channel. The distribution bandwidth may be larger than 80 MHz, and the one or more dRUs including a first dRU allocated to the wireless station. The wireless station may modulate a plurality of symbols for the PPDU onto the set of tones of the first dRU. The wireless station may transmit the plurality of symbols via the first dRU.

Abstract: This disclosure provides methods, devices and systems for increasing carrier frequencies for wireless communications in wireless local area networks (WLANs). Some implementations more specifically relate to BSS discovery and association techniques that support wireless communications on carrier frequencies above 7 GHz. In some aspects, an access point (AP) may communicate using beamforming on a wireless communication link operating at a carrier frequency above 7 GHz (the “directional link”) while offloading the BSS discovery and association procedures needed to support such communications onto a wireless communication link operating at a carrier frequency below 7 GHz (the “anchor link”). In some implementations, the AP may perform a beamforming training operation with a STA over the directional link upon associating with the STA over the anchor link. In such implementations, the AP may communicate with the STA over the directional link using a beam derived from the beamforming training operation.

Abstract: This disclosure provides methods, components, devices and systems for signaling for transmission modes among access points (APs). Some aspects more specifically relate to signaling and physical layer protocol date unit (PPDU) formats for implementing coordinated communications among multiple APs, such as for one or more transmission modes, which may include a coordinated beamforming (COBF), a coordinated spatial reuse (C-SR), an interference mitigation (IM), or a vendor specific (VS) transmission mode. In some examples, a first AP may transmit first information in a first subset of bits of a universal signal (U-SIG) field, that indicates a transmission mode of the multiple transmission modes associated with a shared transmission opportunity (TXOP). Different subsets of bits within the U-SIG field may indicate the transmission mode of the shared TXOP and one or more associated parameters of one or both of the APs.

Abstract: This disclosure provides methods, components, devices and systems for techniques for coordinated beamforming (COBF). Some aspects more specifically relate to COBF sounding. In some examples, a first AP may transmit, to a second AP, a null data packet announcement indicating a sounding occasion and including one or more station information fields that indicate a plurality of parameters for a first null data packet transmission and a second null data packet transmission. The first AP may transmit, during the sounding occasion, the first null data packet transmission in accordance with the plurality of parameters and monitor for one or more sounding feedback messages associated with the first null data packet transmission and associated with the second null data packet transmission. The first AP may transmit, based at least in part on the one or more sounding feedback messages, a coordinated beamforming transmission.

Abstract: This disclosure provides methods, components, devices and systems for coordinated spatial reuse in Wi-Fi, such as a coordinated beamforming (COBF) transmission mode or a coordinated spatial reuse (C-SR) transmission mode. Some aspects more specifically relate to a sharing access point (AP) and shared AP exchanging communications that facilitate the utilization of a transmission mode. In some implementations, a first AP may transmit, to a second AP, a message that includes first information associated with coordinated transmissions in which the first AP and the second AP concurrently transmit to one or more associated stations (STAs). The first information may include one or more of transmit power information for the coordinated transmissions, alignment information for the coordinated transmissions, or a transmission mode. The first AP and the second AP may proceed with coordinated communications within a shared transmission opportunity using the COBF transmission mode or the C-SR transmission mode.

Abstract: Certain aspects of the present disclosure provides a method for signaling support for optional wireless features. According to certain aspects, an apparatus (e.g., an AP or non-AP STA) outputs at least one first element that indicates a capability of the apparatus to support one or more features considered optional for a communication session, obtains at least one second element that indicates a capability of a wireless node to support the one or more features for the communication session, and participates in the communication session with the wireless node in accordance with the capability indicated in at least one of the first element or the second element.

Abstract: This disclosure provides methods, components, devices and systems for multi-layer signaling for ambient power (AMP) devices. Some aspects more specifically relate to AMP device physical layer protocol data unit (PPDU) differentiation. For example, a wireless device (such as the AMP device) may receive a PPDU during a transmission opportunity (TxOP), the PPDU including at least one of at least one spoofing preamble portion, at least one downlink data portion, and at least one uplink data portion, where one or more fields in the at least one spoofing preamble portion, the at least one downlink data portion, or both, define the PPDU as an AMP device PPDU. The wireless device may transmit an uplink signal according to the field(s) defining the PPDU as the AMP device PPDU. In some aspects, the wireless device may receive one or more excitation signals in association with an uplink transmission trigger or response signal.

Abstract: This disclosure provides methods, components, devices, and systems for ultra-high reliability (UHR) signaling design. Some aspects more specifically relate to an access point (AP) transmitting a frame including a user info field to a wireless station (STA), where the user info field supports UHR parameters. The user info field may include a subfield indicating a coding scheme for communications, where the subfield includes at least two bits to support at least three coding scheme options. Additionally, or alternatively, the AP may transmit a trigger frame indicating for one or more STAs to communicate via distributed resource units (RUs). The AP may arrange the user info fields in the trigger frame to implicitly indicate respective global cyclic shift delay (CSD) indexes to the STAs. A STA receiving the trigger frame may determine a global CSD index corresponding to the STA according to the order of the user info fields.

Abstract: This disclosure provides methods, components, devices and systems for multi-layer signaling for ambient power (AMP) devices. Some aspects enable early differentiation between non-backscatter AMP device types through signaling in AMP downlink physical layer protocol data units (PPDUs). For example, a wireless device receives a first portion of an AMP downlink PPDU indicating an intended STA type (such as an active transmitter or an AMP-enabled device) and selectively receives subsequent portions of the AMP downlink PPDU in accordance with whether the type of the wireless device matches the indicated type. In scenarios in which the types match, the wireless device continues receiving the PPDU. Otherwise, the wireless device ceases reception to conserve energy and processing resources. The first portion may include one or more fields that indicate the intended STA type, may indicate a medium access control (MAC) frame type that implicitly indicates the intended STA type, or both.

Abstract: This disclosure provides methods, components, devices and systems for coordinated spatial reuse in Wi-Fi, such as a coordinated beamforming (COBF) transmission mode or a coordinated spatial reuse (C-SR) transmission mode. Some aspects more specifically relate to a sharing access point (AP) and shared AP exchanging communications that facilitate the utilization of a transmission mode. In some implementations, a first AP may transmit, to a second AP, a message that includes first information associated with coordinated transmissions in which the first AP and the second AP concurrently transmit to one or more associated stations (STAs). The first information may include one or more of transmit power information for the coordinated transmissions, alignment information for the coordinated transmissions, or a transmission mode. The first AP and the second AP may proceed with coordinated communications within a shared transmission opportunity using the COBF transmission mode or the C-SR transmission mode.

Abstract: This disclosure provides methods, components, devices and systems for protection for enhanced long range (ELR) transmissions. Aspects more specifically relate request to send (RTS) and clear to send (CTS) signaling exchanges for configuration of an ELR physical layer protocol data unit (PPDU) that protects ELR RTS/CTS frames from interference. For example, a first wireless device may indicate, via a first frame, a modified network allocation vector (NAV) timeout duration that accounts for a full duration of an ELR frame. In some examples, the modified NAV timeout duration may be calculated to account for a difference in data rate of the ELR frame relative to non-ELR frames. For example, the first wireless device may transmit a first frame prior to an ELR RTS/CTS frame, and the first frame may indicate, via a duration field, the modified NAV timeout duration that is calculated in accordance with the ELR RTS/CTS frame.

Abstract: A static crushing directional anchor withdrawal method at the end of a large-mining-height working face is provided. The method includes the following steps: designing key parameters of boreholes for static crushing, including a borehole position, a spacing between boreholes, a borehole depth, and a borehole diameter at the end of a working face; then determining parameters of a static crushing agent grouting technology device for the construction of a static crushing process; and carrying out an anchor withdrawal operation at the end. The method can solve the problem of difficult roof anchor withdrawal at the end of a working face, is beneficial to shortening the hanging roof distance of the working face, preventing the sudden caving of hanging roofs at the upper and lower corners of the working face and the potential safety hazard caused by gas overrun, and guaranteeing the normal use of the mining roadway.

Abstract: This disclosure provides methods, components, devices and systems for interference mitigation (IM) mode signaling designs for a physical layer protocol data unit (PPDU). Some aspects relate to IM mode signaling designs according to which a wireless communication device determines a tone plan in accordance with an ON or OFF state of the IM mode. For example, an ON state of the IM mode may correspond to a first tone plan and an OFF state of the IM mode may correspond to a second tone plan. The first tone plan may define first fixed pilot tone locations, with pilot tones at the first fixed pilot tone locations being usable as IM pilot tones and/or usable as carrier frequency offset (CFO) pilot tones. The second tone plan may define second fixed pilot tone locations, with pilot tones at the second fixed pilot tone locations being exclusively usable as CFO pilot tones.

Abstract: This disclosure provides methods, components, devices and systems for interference mitigation (IM) mode signaling designs for a physical layer (PHY) protocol data unit (PPDU). Some aspects relate to IM mode signaling designs according to which two or more wireless communication devices may determine locations of IM pilot tones within a data portion of a PPDU. In some examples, the wireless communication device may input IM pilot tones prior to a spatial mapping stage in a transmit flow. In such examples, the wireless communication device may insert the IM pilot tones at fixed locations within the data portion of the PPDU and may support an interleaving stage such that the IM pilot tones are factored in. The interleaving stage may be associated with a tone mapping distance or an interleaver that is specific to scenarios in which the IM mode is set to an ON state.

Abstract: This disclosure provides methods, components, devices and systems for interference mitigation (IM) mode signaling designs for a physical layer protocol data unit (PPDU). Some aspects relate to IM mode signaling designs according to which two or more wireless communication devices determine locations of IM pilot tones within a data portion of a PPDU comprising a multiple resource unit (MRU). In such aspects, an MRU may be defined with multiple tone separation distances including a tone separation distance that corresponds to an ON state of the IM mode. Some further aspects relate to IM mode signaling designs according to which two or more wireless communication devices determine locations of pilot tones within a data portion of a PPDU that are usable as IM pilot tones and/or as carrier frequency offset (CFO) pilot tones. In such aspects, the data portion may exclude IM- or CFO-specific pilot tones.