Enhanced single-user sounding and feedback in WLAN communications
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- MEDIATEK INC
- Filing Date
- 2025-03-28
- Publication Date
- 2026-06-17
Smart Images

Figure CN2025085632_09102025_PF_FP_ABST
Abstract
Description
ENHANCED SINGLE-USER SOUNDING AND FEEDBACK IN WLAN COMMUNICATIONSCROSS REFERENCE TO RELATED PATENT APPLICATION
[0001] The present disclosure is part of a non-provisional patent application claiming the priority benefit of U.S. Provisional Patent Application Nos. 63 / 572,974 and 63 / 641,973, filed 02 April 2024 and 03 May 2024, respectively, the contents of which herein being incorporated by reference in their entirety.TECHNICAL FIELD
[0002] The present disclosure is generally related to wireless communications and, more particularly, to enhanced single-user (SU) sounding and feedback in wireless local area network (WLAN) communications.BACKGROUND
[0003] Unless otherwise indicated herein, approaches described in this section are not prior art to the claims listed below and are not admitted as prior art by inclusion in this section.
[0004] In wireless communications such as WiFi (or Wi-Fi) and WLANs, EHT (i.e., WiFi 7) PHY specifies in the Institute of Electrical and Electronics Engineers (IEEE) 802.11be specification D5.0 Clause 35.7.3 (Rules for EHT sounding protocol sequences) that Extremely-High Throughput (EHT) non-trigger based (non-TB) sounding is only for SU sounding. An EHT beamformer that initiates an EHT non-TB sounding sequence is to transmit an EHT null data packet (NDP) announcement frame with a single station (STA) Info field. An EHT beamformer may initiate an EHT non-TB sounding sequence with an EHT beamformee to solicit SU or channel quality indicator (CQI) type feedback.
[0005] On the other hand, EHT trigger-based (TB) sounding is only for multi-user (MU) sounding. An EHT beamformer that initiates an EHT TB sounding sequence is to transmit an EHT NDP Announcement frame with two or more STA Info fields and the recipient address (RA) field set to the broadcast address. This allows both MU feedback and SU feedback.
[0006] SU feedback and MU feedback are types of sounding feedback defined in EHT PHY of the IEEE 802.11 specifications. That is, SU feedback includes average signal-to-noise ratio (SNR) per spatial stream and compressed beamforming channel state information (CSI) for each sub-carrier group. MU feedback includes average SNR per spatial stream, compressed beamforming CSI for each sub-carrier group, and delta SNR per spatial stream for each sub-carrier group.
[0007] However, although non-TB sounding sequence in EHT saves sounding overhead for SU cases without including the trigger frame, the saving usually is small compared to the packet size of EHT compressed beamforming CSI feedback. Enabling a TB sounding sequence in next-generation WiFi to support SU sounding in addition to MU sounding would satisfy all sounding needs and consolidate sounding to one sequence, thereby leading to simplified sounding implementation. Furthermore, next-generation WiFi PHY may support unequal quadrature amplitude modulation (UEQM) transmission on different spatial streams of a SU physical-layer protocol data unit (PPDU) . Quadrature amplitude modulation (QAM) level for each spatial stream could be more accurately chosen to improve throughput if delta SNRs for sub-carrier groups could also be fed back together with average SNR for each spatial stream. More importantly, initial selection of the number of spatial streams (Nss) , modulation and coding scheme (MCS) , and QAM pattern could be derived from Received Bit Mutual Information Rate (RBIR) -based effective signal-to-interference-and-noise ratio (SINR) per spatial stream. This would enable a more accurate initial rate selection and would render a fast link adaptation possible. Therefore, there is a need for a solution of enhanced SU sounding and feedback in WLAN communications.SUMMARY
[0008] The following summary is illustrative only and is not intended to be limiting in any way. That is, the following summary is provided to introduce concepts, highlights, benefits and advantages of the novel and non-obvious techniques described herein. Select implementations are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
[0009] An objective of the present disclosure is to provide schemes, concepts, designs, techniques, methods and apparatuses pertaining to enhanced SU sounding and feedback in WLAN communications. It is believed that various schemes proposed in the present disclosure may enable SU sounding using a TB sounding sequence in the next-generation PHY to simplify sounding sequences as well as enhance SU sounding feedback to support unequal modulation (UEQM) in the next-generation PHY.
[0010] In one aspect, a method may involve a processor of a processor of a first STA (e.g., an access point (AP) STA) performing a TB sounding by transmitting a TB sounding sequence to one or more second STAs (e.g., non-AP STAs) . The method may also involve the processor receiving a feedback from at least one of the one or more second STAs responsive to transmitting the TB sounding sequence.
[0011] In another aspect, a method may involve a processor of a second STA (e.g., non-AP STA) performing an SU sounding by transmitting a non-TB sounding sequence to a first STA (e.g., AP STA) . The method may also involve the processor receiving a feedback from the first STA responsive to transmitting the non-TB sounding sequence.
[0012] In yet another aspect, a method may involve a processor of a second STA (e.g., non-AP STA) receiving a TB sounding sequence from a first STA (e.g., AP STA) . The method may also involve the processor transmitting a feedback to the first STA responsive to receiving the TB sounding sequence.
[0013] in a further aspect, a method may involve a processor of a first STA (e.g., AP STA) receiving a non-TB sounding sequence from a second STA (e.g., non-AP STA) . The method may also involve the processor transmitting a feedback to the second STA as a response to receiving the non-TB sounding sequence.
[0014] It is noteworthy that, although description provided herein may be in the context of certain radio access technologies, networks and network topologies such as, WiFi / WLAN, the proposed concepts, schemes and any variation (s) / derivative (s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies such as, for example and without limitation, Bluetooth, ZigBee, 5th Generation (5G) / New Radio (NR) , Long-Term Evolution (LTE) , LTE-Advanced, LTE-Advanced Pro, Internet-of-Things (IoT) , Industrial IoT (IIoT) and narrowband IoT (NB-IoT) . Thus, the scope of the present disclosure is not limited to the examples described herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the present disclosure. The drawings illustrate implementations of the disclosure and, together with the description, serve to explain the principles of the disclosure. It is appreciable that the drawings are not necessarily in scale as some components may be shown to be out of proportion than the size in actual implementation to clearly illustrate the concept of the present disclosure.
[0016] FIG. 1 is a diagram of an example network environment in which various solutions and schemes in accordance with the present disclosure may be implemented.
[0017] FIG. 2 is a diagram of an example scenario under a proposed scheme in accordance with the present disclosure.
[0018] FIG. 3 is a block diagram of an example communication system under a proposed scheme in accordance with the present disclosure.
[0019] FIG. 4 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0020] FIG. 5 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0021] FIG. 6 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0022] FIG. 7 is a flowchart of an example process in accordance with an implementation of the present disclosure. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0023] Detailed embodiments and implementations of the claimed subject matters are disclosed herein. However, it shall be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matters which may be embodied in various forms. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that description of the present disclosure is thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In the description below, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations. Overview
[0024] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to enhanced SU sounding and feedback in WLAN communications. According to the present disclosure, a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
[0025] FIG. 1 illustrates an example network environment 100 in which various solutions and schemes in accordance with the present disclosure may be implemented. FIG. 2 ~ FIG. 7 illustrate examples of implementation of various proposed schemes in network environment 100 in accordance with the present disclosure. The following description of various proposed schemes is provided with reference to FIG. 1 ~ FIG. 7.
[0026] Referring to FIG. 1, network environment 100 may involve at least a station STA 110 communicating wirelessly with a STA 120. Either of STA 110 and STA 120 may function as an access point (AP) STA or a non-AP STA. For instance, in the examples provided in the present disclosure, STA 110 may function as an AP STA while STA 120 may function as a non-AP STA, or vice versa. In some cases, STA 110 and STA 120 may be associated with a basic service set (BSS) in accordance with one or more IEEE 802.11 standards. Each of STA 110 and STA 120 may be configured to communicate with each other by utilizing the enhanced SU sounding and feedback in accordance with various proposed schemes described below. It is noteworthy that, while the various proposed schemes may be individually or separately described below, in actual implementations some or all of the proposed schemes may be utilized or otherwise implemented jointly. Of course, each of the proposed schemes may be utilized or otherwise implemented individually or separately.
[0027] Under the proposed schemes in accordance with the present disclosure, STA 110 and STA 120 may utilize one or more methods to enhance SU sounding and feedback. In a first method (Method A) , STA 110 and STA 120 may enable TB sounding sequences to support SU sounding with MU type feedback. In a second method (Method B) , STA 110 and STA 120 may enable TB sounding sequences to support SU sounding with Enhanced SU type feedback. In a third method (Method C) , STA 110 and STA 120 may add an Enhanced SU type feedback to SU sounding in non-TB sounding sequences. In addition to Method C, MU type feedback may be added to SU sounding in non-TB sounding sequences to support UEQM SU PPDUs.
[0028] Under a proposed scheme in accordance with the present disclosure, one or more of a plurality of options may be adopted in the Enhanced SU type feedback in next-generation WiFi to support UEQM. In a first option (Option 1) , Enhanced SU feedback may include the following information: (a) average SNR per spatial stream, (b) compressed beamforming feedback matrix V for each sub-carrier group, and (c) delta SNR per spatial stream for each sub-carrier group. In a second option (Option 2) Enhanced SU feedback may include the following information: (a) effective SINR (RBIR based) per spatial stream, which may be calculated for a pre-designed high order QAM (e.g., 256 QAM or 1024 QAM) and (b) compressed beamforming feedback matrix V for each sub-carrier group. In a third option (Option 3) , Enhanced SU feedback may include the following information: (a) effective SINR (RBIR based) per spatial stream (e.g., for the recommended Nss and QAM pattern) , (b) compressed beamforming feedback matrix V for each sub-carrier group, and (c) UEQM Exclusive Report field including recommended Nss and QAM pattern, which may be derived from effective SINR per spatial stream. In a fourth option (Option 4) Enhanced SU feedback may include the following information: (a) compressed beamforming feedback matrix V for each sub-carrier group and (b) UEQM Exclusive Report field including: (i) recommended Nss, MCS and QAM pattern, which may be derived from effective SINR per spatial stream, and (ii) margin effective SINR (RBIR based) per spatial stream. Under the proposed scheme, both Option 1 and one of Options 2, 3 and 4 may be adopted in Enhanced SU feedback.
[0029] Under a proposed scheme in accordance with the present disclosure, the initial selection of Nss, MCS and QAM pattern may be derived from RBIR-based effective SINR per spatial stream. For instance, RBIR-based (margin) effective SINR per spatial stream may be derived at beamformee side and reported in Enhanced SU type feedback (Option 2, 3 and 4) . The effective SINR may be calculated for a pre-designed QAM level (Option 2) or the reported QAM pattern (Option 3 and 4) . Effective SINR may also be derived at beamformer side from Enhanced SU feedback (Option 1) . In Option 4, margin effective SINR per spatial stream may be included with Recommended MCS in Enhanced SU type feedback. In Option 3 and 4, the beamformee may determine the optimal Nss, which may be equal to or smaller than the Nss requested, and the beamformee may report it with the recommend QAM pattern.
[0030] FIG. 2 illustrates an example scenario 200 under a proposed scheme in accordance with the present disclosure. With Enhanced SU sounding and feedback methods described above, a comparison of next-generation sounding and feedback types with existing ones specified in the IEEE 802.11be specification is summarized in the table shown in FIG. 2.
[0031] Under the proposed scheme, Method A enables a TB sounding sequence to support SU sounding with MU type feedback. Limits on the STA Info field may be lifted to enable SU Sounding in the TB Sounding Sequence. With Method A applied in next-generation WiFi, one TB sounding sequence may be used to sound a single STA or multiple STAs. Moreover, a STA sounded may be solicited to report MU type sounding feedback to support UEQM. Furthermore, a beamformer may use the MU type sounding feedback to find or otherwise determine the optimal Nss, QAM pattern, and MCS for UEQM initial rate selection.
[0032] Under the proposed scheme, Method B enables a TB sounding sequence to support SU sounding with Enhanced SU type feedback. Limits on the STA Info field may be lifted to enable SU Sounding in a TB Sounding Sequence. Feedback Type in NDPA and MIMO Control Field can be extended to signal Enhanced SU feedback. With Method B applied in next-generation WiFi, one TB sounding sequence may be used to sound a single STA or multiple STAs. Additionally, a STA that is sounded may be solicited to report Enhanced SU type sounding feedback to support UEQM. Moreover, a beamformer may use the Nss, QAM pattern, and MCS reported in or derived from Enhanced SU type sounding feedback for UEQM initial rate selection.
[0033] Under the proposed scheme, Method C has Enhanced SU type feedback added to SU sounding in a non-TB sounding sequence. Feedback Type in Null Data Packet Announcement (NDPA) and Multi-Input-Multiple-Output (MIMO) Control Field may be extended to signal Enhanced SU feedback. With Method C applied in next-generation WiFi, a TB sounding sequence may be used to sound multiple STAs, and a non-TB sounding sequence may be used to sound a single STA. Additionally, a single STA that is sounded may be solicited to report Enhanced SU type sounding feedback to support UEQM. Moreover, an AP may use the Nss, QAM pattern, and MCS reported in or derived from Enhanced SU type sounding feedback for UEQM initial rate selection. Illustrative Implementations
[0034] FIG. 3 illustrates an example system 300 having at least an example apparatus 310 and an example apparatus 320 in accordance with an implementation of the present disclosure. Each of apparatus 310 and apparatus 320 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to enhanced SU sounding and feedback in WLAN communications, including the various schemes described above with respect to various proposed designs, concepts, schemes, systems and methods described above as well as processes described below. For instance, apparatus 310 may be implemented in STA 110 and apparatus 320 may be implemented in STA 120, or vice versa.
[0035] Each of apparatus 310 and apparatus 320 may be a part of an electronic apparatus, which may be a non-AP STA or an AP STA, (e.g., apparatus 310 functioning as an AP STA and apparatus 320 functioning as a non-AP STA) such as a portable or mobile apparatus, a wearable apparatus, a wireless communication apparatus or a computing apparatus. When implemented in a STA, each of apparatus 310 and apparatus 320 may be implemented in a smartphone, a smart watch, a personal digital assistant, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer. Each of apparatus 310 and apparatus 320 may also be a part of a machine type apparatus, which may be an IoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a wire communication apparatus or a computing apparatus. For instance, each of apparatus 310 and apparatus 320 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center. When implemented in or as a network apparatus, apparatus 310 and / or apparatus 320 may be implemented in a network node, such as an AP in a WLAN.
[0036] In some implementations, each of apparatus 310 and apparatus 320 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction set computing (RISC) processors, or one or more complex-instruction-set-computing (CISC) processors. In the various schemes described above, each of apparatus 310 and apparatus 320 may be implemented in or as a STA or an AP. Each of apparatus 310 and apparatus 320 may include at least some of those components shown in FIG. 3 such as a processor 312 and a processor 322, respectively, for example. Each of apparatus 310 and apparatus 320 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of apparatus 310 and apparatus 320 are neither shown in FIG. 3 nor described below in the interest of simplicity and brevity.
[0037] In one aspect, each of processor 312 and processor 322 may be implemented in the form of one or more single-core processors, one or more multi-core processors, one or more RISC processors or one or more CISC processors. That is, even though a singular term “a processor” is used herein to refer to processor 312 and processor 322, each of processor 312 and processor 322 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure. In another aspect, each of processor 312 and processor 322 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and / or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure. In other words, in at least some implementations, each of processor 312 and processor 322 is a special-purpose machine specifically designed for enhanced SU sounding and feedback in WLAN communications in accordance with various implementations of the present disclosure.
[0038] In some implementations, apparatus 310 may also include a transceiver 316 coupled to processor 312. Transceiver 316 may include a transmitter capable of wirelessly transmitting and a receiver capable of wirelessly receiving data. In some implementations, apparatus 320 may also include a transceiver 326 coupled to processor 322. Transceiver 326 may include a transmitter capable of wirelessly transmitting and a receiver capable of wirelessly receiving data. It is noteworthy that, although transceiver 316 and transceiver 326 are illustrated as being external to and separate from processor 312 and processor 322, respectively, in some implementations, transceiver 316 may be an integral part of processor 312 as a system on chip (SoC) , and transceiver 326 may be an integral part of processor 322 as a SoC.
[0039] In some implementations, apparatus 310 may further include a memory 314 coupled to processor 312 and capable of being accessed by processor 312 and storing data therein. In some implementations, apparatus 320 may further include a memory 324 coupled to processor 322 and capable of being accessed by processor 322 and storing data therein. Each of memory 314 and memory 324 may include a type of random-access memory (RAM) such as dynamic RAM (DRAM) , static RAM (SRAM) , thyristor RAM (T-RAM) and / or zero-capacitor RAM (Z-RAM) . Alternatively, or additionally, each of memory 314 and memory 324 may include a type of read-only memory (ROM) such as mask ROM, programmable ROM (PROM) , erasable programmable ROM (EPROM) and / or electrically erasable programmable ROM (EEPROM) . Alternatively, or additionally, each of memory 314 and memory 324 may include a type of non-volatile random-access memory (NVRAM) such as flash memory, solid-state memory, ferroelectric RAM (FeRAM) , magnetoresistive RAM (MRAM) and / or phase-change memory.
[0040] Each of apparatus 310 and apparatus 320 may be a communication entity capable of communicating with each other using various proposed schemes in accordance with the present disclosure. For illustrative purposes and without limitation, a description of capabilities of apparatus 310, as STA 110, and apparatus 320, as STA 120, is provided below in the context of example processes 400, 500, 600 and 700. It is noteworthy that, although a detailed description of capabilities, functionalities and / or technical features of one of apparatus 310 and apparatus 320 is provided below, the same may be applied to the other of apparatus 310 and apparatus 320 although a detailed description thereof is not provided solely in the interest of brevity. It is also noteworthy that, although the example implementations described below are provided in the context of WLAN, the same may be implemented in other types of networks. Illustrative Processes
[0041] FIG. 4 illustrates an example process 400 in accordance with an implementation of the present disclosure. Process 400 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 400 may represent an aspect of the proposed concepts and schemes pertaining to enhanced SU sounding and feedback in WLAN communications in accordance with the present disclosure. Process 400 may include one or more operations, actions, or functions as illustrated by one or more of blocks 410 and 420. Although illustrated as discrete blocks, various blocks of process 400 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 400 may be executed in the order shown in FIG. 4 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 400 may be executed repeatedly or iteratively. Process 400 may be implemented by or in apparatus 310 and apparatus 320 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 400 is described below in the context of apparatus 310 implemented in or as STA 110 (e.g., AP STA) and apparatus 320 implemented in or as STA 120 (e.g., non-AP STA) of a wireless network such as a WLAN in network environment 100 in accordance with one or more of IEEE 802.11 standards. Process 400 may begin at block 410.
[0042] At 410, process 400 may involve processor 312 of apparatus 310 (an AP STA) performing, via transceiver 316, a TB sounding by transmitting a TB sounding sequence to one or more second STAs (one or more non-AP STAs) . Process 400 may proceed from 410 to 420.
[0043] At 420, process 400 may involve processor 312 receiving, via transceiver 316, a feedback from at least one of the one or more second STAs (e.g., apparatus 320 as STA 120 functioning as a non-AP STA) responsive to transmitting the TB sounding sequence.
[0044] In some implementations (e.g., Method A) , the TB sounding may involve an SU sounding, and the feedback may include an SU type feedback, an MU type feedback, or a CQI type feedback.
[0045] In some implementations (e.g., Method B) , the TB sounding may involve an SU sounding, and the feedback may include an SU type feedback, an enhanced SU type feedback, or a CQI type feedback. In some implementations (e.g., Option 1) , the enhanced SU type feedback may include information on: (i) an average SNR per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) a delta SNR per spatial stream for each sub-carrier group. In some implementations (e.g., Option 2) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; and (ii) a compressed beamforming feedback matrix for each sub-carrier group. In some implementations (e.g., Option 3) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) an UEQM report field including a recommended Nss and QAM pattern. In some implementations (e.g., Option 4) , the enhanced SU type feedback may include information on:(i) a compressed beamforming feedback matrix for each sub-carrier group; and (ii) an UEQM report field including: (a) a recommended Nss, an MCS and a QAM pattern, which are derived from an effective SINR per spatial stream; and (c) a margin effective SINR (RBIR based) per spatial stream.
[0046] In some implementations (e.g., Method B) , the TB sounding may involve an MU sounding, and the feedback may include an SU type feedback, an enhanced SU type feedback, an MU type feedback, or a CQI type feedback. In some implementations (e.g., Option 1) , the enhanced SU type feedback may include information on: (i) an average SNR per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) a delta SNR per spatial stream for each sub-carrier group. In some implementations (e.g., Option 2) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; and (ii) a compressed beamforming feedback matrix for each sub-carrier group. In some implementations (e.g., Option 3) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) an UEQM report field including a recommended Nss and QAM pattern. In some implementations (e.g., Option 4) , the enhanced SU type feedback may include information on: (i) a compressed beamforming feedback matrix for each sub-carrier group; and (ii) an UEQM report field including: (a) a recommended Nss, an MCS and a QAM pattern, which are derived from an effective SINR per spatial stream; and (c) a margin effective SINR (RBIR based) per spatial stream.
[0047] FIG. 5 illustrates an example process 500 in accordance with an implementation of the present disclosure. Process 500 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 500 may represent an aspect of the proposed concepts and schemes pertaining to enhanced SU sounding and feedback in WLAN communications in accordance with the present disclosure. Process 500 may include one or more operations, actions, or functions as illustrated by one or more of blocks 510 and 520. Although illustrated as discrete blocks, various blocks of process 500 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 500 may be executed in the order shown in FIG. 5 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 500 may be executed repeatedly or iteratively. Process 500 may be implemented by or in apparatus 310 and apparatus 320 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 500 is described below in the context of apparatus 310 implemented in or as STA 110 (e.g., AP STA) and apparatus 320 implemented in or as STA 120 (e.g., non-AP STA) of a wireless network such as a WLAN in network environment 100 in accordance with one or more of IEEE 802.11 standards. Process 500 may begin at block 510.
[0048] At 510, process 500 may involve processor 322 of apparatus 320 (anon-AP STA) performing, via transceiver 326, an SU sounding by transmitting a non-TB sounding sequence to a first STA (an AP STA) . Process 500 may proceed from 510 to 520.
[0049] At 520, process 500 may involve processor 322 receiving, via transceiver 326, a feedback from the first STA (e.g., apparatus 310 as STA 110 functioning as an AP STA) responsive to transmitting the non-TB sounding sequence.
[0050] In some implementations (e.g., Method C) , the non-TB sounding may involve a SU sounding, and the feedback may include an SU type feedback, an enhanced SU type feedback, or a CQI type feedback.
[0051] In some implementations (e.g., Option 1) , the enhanced SU type feedback may include information on: (i) an average SNR per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) a delta SNR per spatial stream for each sub-carrier group. In some implementations (e.g., Option 2) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; and (ii) a compressed beamforming feedback matrix for each sub-carrier group. In some implementations (e.g., Option 3) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) an UEQM report field including a recommended Nss and QAM pattern. In some implementations (e.g., Option 4) , the enhanced SU type feedback may include information on:(i) a compressed beamforming feedback matrix for each sub-carrier group; and (ii) an UEQM report field including: (a) a recommended Nss, an MCS and a QAM pattern, which are derived from an effective SINR per spatial stream; and (c) a margin effective SINR (RBIR based) per spatial stream.
[0052] FIG. 6 illustrates an example process 600 in accordance with an implementation of the present disclosure. Process 600 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 600 may represent an aspect of the proposed concepts and schemes pertaining to enhanced SU sounding and feedback in WLAN communications in accordance with the present disclosure. Process 600 may include one or more operations, actions, or functions as illustrated by one or more of blocks 610 and 620. Although illustrated as discrete blocks, various blocks of process 600 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 600 may be executed in the order shown in FIG. 6 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 600 may be executed repeatedly or iteratively. Process 600 may be implemented by or in apparatus 310 and apparatus 320 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 600 is described below in the context of apparatus 310 implemented in or as STA 110 (e.g., AP STA) and apparatus 320 implemented in or as STA 120 (e.g., non-AP STA) of a wireless network such as a WLAN in network environment 100 in accordance with one or more of IEEE 802.11 standards. Process 600 may begin at block 610.
[0053] At 610, process 600 may involve processor 322 of apparatus 320 (anon-AP STA) receiving, via transceiver 326, a TB sounding sequence from a first STA (e.g., apparatus 310 as STA 110 as an AP STA) . Process 600 may proceed from 610 to 620.
[0054] At 620, process 600 may involve processor 322 transmitting, via transceiver 326, a feedback to the first STA responsive to receiving the TB sounding sequence.
[0055] In some implementations, the TB sounding may involve an SU sounding, and the feedback may include an SU type feedback, an enhanced SU type feedback, or a CQI type feedback.
[0056] In some implementations (e.g., Option 1) , the enhanced SU type feedback may include information on: (i) an average SNR per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) a delta SNR per spatial stream for each sub-carrier group. In some implementations (e.g., Option 2) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; and (ii) a compressed beamforming feedback matrix for each sub-carrier group. In some implementations (e.g., Option 3) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) an UEQM report field including a recommended Nss and QAM pattern. In some implementations (e.g., Option 4) , the enhanced SU type feedback may include information on: (i) a compressed beamforming feedback matrix for each sub-carrier group; and (ii) an UEQM report field including: (a) a recommended Nss, an MCS and a QAM pattern, which are derived from an effective SINR per spatial stream; and (c) a margin effective SINR (RBIR based) per spatial stream.
[0057] FIG. 7 illustrates an example process 700 in accordance with an implementation of the present disclosure. Process 700 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 700 may represent an aspect of the proposed concepts and schemes pertaining to enhanced SU sounding and feedback in WLAN communications in accordance with the present disclosure. Process 700 may include one or more operations, actions, or functions as illustrated by one or more of blocks 710 and 720. Although illustrated as discrete blocks, various blocks of process 700 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 700 may be executed in the order shown in FIG. 7 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 700 may be executed repeatedly or iteratively. Process 700 may be implemented by or in apparatus 310 and apparatus 320 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 700 is described below in the context of apparatus 310 implemented in or as STA 110 (e.g., AP STA) and apparatus 320 implemented in or as STA 120 (e.g., non-AP STA) of a wireless network such as a WLAN in network environment 100 in accordance with one or more of IEEE 802.11 standards. Process 700 may begin at block 710.
[0058] At 710, process 700 may involve processor 312 of apparatus 310 (an AP STA) receiving, via transceiver 316, a non-TB sounding sequence from a second STA (e.g., apparatus 320 as STA 120 as a non-AP STA) . Process 700 may proceed from 710 to 720.
[0059] At 720, process 700 may involve processor 312 transmitting, via transceiver 316, a feedback to the second STA responsive to receiving the non-TB sounding sequence.
[0060] In some implementations (e.g., Method C) , the non-TB sounding may involve a SU sounding, and the feedback may include an SU type feedback, an enhanced SU type feedback, or a CQI type feedback.
[0061] In some implementations (e.g., Option 1) , the enhanced SU type feedback may include information on: (i) an average SNR per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) a delta SNR per spatial stream for each sub-carrier group. In some implementations (e.g., Option 2) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; and (ii) a compressed beamforming feedback matrix for each sub-carrier group. In some implementations (e.g., Option 3) , the enhanced SU type feedback may include information on: (i) an effective SINR (RBIR based) per spatial stream; (ii) a compressed beamforming feedback matrix for each sub-carrier group; and (iii) an UEQM report field including a recommended Nss and QAM pattern. In some implementations (e.g., Option 4) , the enhanced SU type feedback may include information on: (i) a compressed beamforming feedback matrix for each sub-carrier group; and (ii) an UEQM report field including: (a) a recommended Nss, an MCS and a QAM pattern, which are derived from an effective SINR per spatial stream; and (c) a margin effective SINR (RBIR based) per spatial stream. Additional Notes
[0062] The herein-described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected" , or "operably coupled" , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable" , to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and / or physically interacting components and / or wirelessly interactable and / or wirelessly interacting components and / or logically interacting and / or logically interactable components.
[0063] Further, with respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.
[0064] Moreover, it will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to, ” the term “having” should be interpreted as “having at least, ” the term “includes” should be interpreted as “includes but is not limited to, ” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an, " e.g., “a” and / or “an” should be interpreted to mean “at least one” or “one or more; ” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations, " without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “Aor B” will be understood to include the possibilities of “A” or “B” or “Aand B. ”
[0065] From the foregoing, it will be appreciated that various implementations of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Claims
1.A method, comprising:performing, by a processor of a first station (STA) as an access point (AP) STA, a trigger-based (TB) sounding by transmitting a TB sounding sequence to one or more second STAs as one or more non-AP STAs; andreceiving, by the processor, a feedback from at least one of the one or more second STAs responsive to transmitting the TB sounding sequence.2.The method of Claim 1, wherein the TB sounding comprises a single-user (SU) sounding, and wherein the feedback comprises an SU type feedback, a multi-user (MU) type feedback, or a channel quality indicator (CQI) type feedback.3.The method of Claim 1, wherein the TB sounding comprises a single-user (SU) sounding, and wherein the feedback comprises an SU type feedback, an enhanced SU type feedback, or a channel quality indicator (CQI) type feedback.4.The method of Claim 3, wherein the enhanced SU type feedback comprises information on:an average signal-to-noise ratio (SNR) per spatial stream;a compressed beamforming feedback matrix for each sub-carrier group; anda delta SNR per spatial stream for each sub-carrier group.5.The method of Claim 3, wherein the enhanced SU type feedback comprises information on:an effective signal-to-interference-and-noise ratio (SINR) per spatial stream; anda compressed beamforming feedback matrix for each sub-carrier group.6.The method of Claim 3, wherein the enhanced SU type feedback comprises information on:an effective signal-to-interference-and-noise ratio (SINR) per spatial stream;a compressed beamforming feedback matrix for each sub-carrier group; andan unequal modulation (UEQM) report field including a recommended number of spatial streams (Nss) and quadrature amplitude modulation (QAM) pattern.7.The method of Claim 3, wherein the enhanced SU type feedback comprises information on:a compressed beamforming feedback matrix for each sub-carrier group; andan unequal modulation (UEQM) report field including:a recommended number of spatial streams (Nss) , a modulation and coding scheme (MCS) and a quadrature amplitude modulation (QAM) pattern, which are derived from an effective signal-to-interference-and-noise ratio (SINR) per spatial stream; anda margin effective SINR per spatial stream.8.The method of Claim 1, wherein the TB sounding comprises a multi-user (MU) sounding, and wherein the feedback comprises a single-user (SU) type feedback, an enhanced SU type feedback, an MU type feedback, or a channel quality indicator (CQI) type feedback.9.The method of Claim 8, wherein the enhanced SU type feedback comprises information on:an average signal-to-noise ratio (SNR) per spatial stream;a compressed beamforming feedback matrix for each sub-carrier group; anda delta SNR per spatial stream for each sub-carrier group.10.The method of Claim 8, wherein the enhanced SU type feedback comprises information on:an effective signal-to-interference-and-noise ratio (SINR) per spatial stream; anda compressed beamforming feedback matrix for each sub-carrier group.11.The method of Claim 8, wherein the enhanced SU type feedback comprises information on:an effective signal-to-interference-and-noise ratio (SINR) per spatial stream;a compressed beamforming feedback matrix for each sub-carrier group; andan unequal modulation (UEQM) report field including a recommended number of spatial streams (Nss) and quadrature amplitude modulation (QAM) pattern.12.The method of Claim 8, wherein the enhanced SU type feedback comprises information on:a compressed beamforming feedback matrix for each sub-carrier group; andan unequal modulation (UEQM) report field including:a recommended number of spatial streams (Nss) , a modulation and coding scheme (MCS) and a quadrature amplitude modulation (QAM) pattern, which are derived from an effective signal-to-interference-and-noise ratio (SINR) per spatial stream; anda margin effective SINR per spatial stream.13.A method, comprising:performing, by a processor of a second station (STA) as a non-access point (non-AP) STA, a single-user (SU) sounding by transmitting a non-trigger based (non-TB) sounding sequence to a -first STA as an access point (AP) STA; andreceiving, by the processor, a feedback from -the first STA responsive to transmitting the non-TB sounding sequence.14.The method of Claim 13, wherein the feedback comprises an SU type feedback, an enhanced SU type feedback, or a channel quality indicator (CQI) type feedback.15.The method of Claim 14, wherein the enhanced SU type feedback comprises information on:an average signal-to-noise ratio (SNR) per spatial stream;a compressed beamforming feedback matrix for each sub-carrier group; anda delta SNR per spatial stream for each sub-carrier group.16.The method of Claim 14, wherein the enhanced SU type feedback comprises information on:an effective signal-to-interference-and-noise ratio (SINR) per spatial stream; anda compressed beamforming feedback matrix for each sub-carrier group.17.The method of Claim 14, wherein the enhanced SU type feedback comprises information on:an effective signal-to-interference-and-noise ratio (SINR) per spatial stream;a compressed beamforming feedback matrix for each sub-carrier group; andan unequal modulation (UEQM) report field including a recommended number of spatial streams (Nss) and quadrature amplitude modulation (QAM) pattern.18.The method of Claim 14, wherein the enhanced SU type feedback comprises information on:a compressed beamforming feedback matrix for each sub-carrier group; andan unequal modulation (UEQM) report field including:a recommended number of spatial streams (Nss) , a modulation and coding scheme (MCS) and a quadrature amplitude modulation (QAM) pattern, which are derived from an effective signal-to-interference-and-noise ratio (SINR) per spatial stream; anda margin effective SINR per spatial stream.19.A method, comprising:receiving, by a processor of a second station (STA) as a non-access point (non-AP) STA, a trigger-based (TB) sounding sequence from a first STA as an access point (AP) STA; andtransmitting, by the processor, a feedback to the first STA responsive to receiving the TB sounding sequence,wherein the TB sounding comprises a single-user (SU) sounding, andwherein the feedback comprises an SU type feedback, an enhanced SU type or MU type feedback, and a channel quality indicator (CQI) type feedback.20.A method, comprising:receiving, by a processor of a first station (STA) as an access point (AP) STA, a non-trigger based (non-TB) sounding sequence from a second STA as a non-AP STA; andtransmitting, by the processor, a feedback to the second STA responsive to receiving the non-TB sounding sequence,wherein the non-TB sounding comprises a single-user (SU) sounding, andwherein the feedback comprises an SU type feedback, an enhanced SU type feedback, or a channel quality indicator (CQI) type feedback.