US20130215947A1 - Data feedback methods and related apparatuses - Google Patents

Data feedback methods and related apparatuses Download PDF

Info

Publication number
US20130215947A1
US20130215947A1 US13/838,420 US201313838420A US2013215947A1 US 20130215947 A1 US20130215947 A1 US 20130215947A1 US 201313838420 A US201313838420 A US 201313838420A US 2013215947 A1 US2013215947 A1 US 2013215947A1
Authority
US
United States
Prior art keywords
beamformee
spatial streams
message
beamformer
columns
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/838,420
Other languages
English (en)
Inventor
Zongming Yao
Menghong LIU
Linfeng Xia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to US13/869,479 priority Critical patent/US20130235947A1/en
Assigned to HUAWEI TECHNOLOGIES CO., LTD. reassignment HUAWEI TECHNOLOGIES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: XIA, LINFENG, YAO, ZONGMING, LIU, MENGHONG
Publication of US20130215947A1 publication Critical patent/US20130215947A1/en
Priority to US15/854,489 priority patent/US10256874B2/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • the present invention relates to the communications field, and in particular, to data feedback methods and related apparatuses.
  • IEEE802.11ac is a branch of the IEEE802.11 protocol series and introduces a very-high-throughput probing mechanism, which is a channel detection mechanism between a beamformer and a beamformee. With this mechanism, the beamformer is capable of better knowing the situation of a channel between the beamformer and the beamformee. As such, the communication status can be improved by adjusting related parameters.
  • the corresponding physical device of the Beamformer is an access point (AP, Access point) and that of the Beamformee is a station (STA, Station); and on a network that is not constructed of a basic service set, the corresponding physical device of the Beamformer may be a certain STA and that of the Beamformee may be another STA.
  • BSS Basic Service Set
  • AP access point
  • STA station
  • the corresponding physical device of the Beamformer may be a certain STA and that of the Beamformee may be another STA.
  • IEEE802.11ac specifies that the number of actual active antennas of the beamformee must be larger than or equal to the number of columns (NC) set by the beamformer in a null data packet announcement (NDPA, Null data packet Announcement) message. Therefore, after receiving the NDPA message, the beamformee has no corresponding processing mechanism if it finds that the number of its actual active antennas is smaller than the number of columns set by the beamformer in the NDPA message. This leads to logical imprecision and disorder of IEEE802.11ac, finally affecting the design of related products.
  • NCP null data packet announcement
  • Embodiments of the present invention provide a data feedback method and related apparatuses. This enables a beamformer to adjust, according to related channel information fed back from a beamformee, the communication status no matter whether the number of actual active antennas of the beamformee is larger than or equal to the number of columns set by the beamformer in an NDPA message.
  • a data feedback method provided in the present invention includes: acquiring, by a beamformee, the number of columns from a null data packet announcement NDPA message; detecting the number of active first spatial streams; comparing the number of first spatial streams with the number of columns and taking the smaller value obtained from the comparison as the number of second spatial streams required for feedback; and feeding back the number of second spatial streams and corresponding spatial stream measurement information about second spatial streams to a beamformer.
  • a data feedback method provided in the present invention includes: acquiring, by a beamformee, the number of columns from a null data packet announcement NDPA message; detecting, by the beamformee, the number of active spatial streams; and determining, by the beamformee, whether the number of spatial streams is smaller than the number of columns, and, if yes, feeding back a null data packet to a beamformer.
  • a method for sending a null data packet announcement message includes: acquiring, by a beamformer, the number of active antennas of a beamformee during a capability negotiation process between the beamformer and the beamformee; setting, by the beamformer, the number of columns in an NDPA message according to the number of the antennas so that the number of columns is smaller than the number of the antennas; and sending, by the beamformer, the NDPA message to the beamformee.
  • a beamformee provided in the present invention includes: a unit for acquiring the number of columns, configured to acquire the number of columns from a null data packet announcement NDPA message; a unit for detecting the number of spatial streams, configured to detect the number of active spatial streams; and a determining unit, configured to determine whether the number of spatial streams is smaller than the number of columns, and, if yes, trigger a null data packet feedback unit; and the null data packet feedback unit, configured to feed back a null data packet to a beamformer.
  • a beamformer provided in the present invention includes: a unit for acquiring the number of antennas, configured to acquire the number of active antennas of a beamformee during a capability negotiation process between the beamformer and the beamformee; a unit for setting the number of columns, configured to set the number of columns in an NDPA message according to the number of antennas so that the number of columns is smaller than the number of antennas; and a message sending unit, configured to send the NDPA message to the beamformee.
  • the embodiments of the present invention have the following advantages: By comparing the number of active first spatial streams with the number of columns, a beamformee according to an embodiment of the present invention takes the obtained smaller value as the number of second spatial streams required for feedback and feeds back this correct number of active second spatial streams to a beamformer. In this way, the beamformer is capable of timely knowing its actual communication status and correspondingly optimizing and adjusting the communication status.
  • FIG. 1 is a schematic flowchart of a data feedback method according to an embodiment of the present invention
  • FIG. 3 is a signaling flowchart of a data feedback method according to an embodiment of the present invention.
  • FIG. 5 is another schematic flowchart of a data feedback method according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of a method for sending a null data packet announcement message according to an embodiment of the present invention
  • FIG. 7 is a schematic flowchart of a beamformee according to an embodiment of the present invention.
  • FIG. 8 is another schematic flowchart of a beamformee according to an embodiment of the present invention.
  • FIG. 9 is a schematic flowchart of a beamformer according to an embodiment of the present invention.
  • the embodiments of the present invention provide a data feedback method and related apparatuses. This enables a beamformer to adjust, according to related channel information about a beamformee, the communication status no matter whether the number of actual active antennas of the beamformee is larger than or equal to the number of columns set by the beamformer in an NDPA message.
  • an embodiment of a data feedback method in the present invention includes:
  • a beamformee acquires the number of columns from a null data packet announcement message sent by a beamformer.
  • the beamformee receives the NDPA message and determines that the beamformee is the one requested by a beamformer to send feedback, and extracts the number of columns of station information (STA Info, STA Information) from the NDPA message, where the number of columns is obtained by adding 1 to the value of the Nc Index field set by the beamformer in the NDPA message and is used to indicate the number of spatial streams that a STA needs to feed back.
  • STA Info station information
  • the beamformee detects the number of active first spatial streams.
  • the beamformee detects spatial streams where data transmission exists and determines the number of active first spatial streams.
  • the beamformee compares the number of first spatial streams with the number of columns.
  • the beamformee compares the number of active first spatial streams with the number of columns in the NDPA message, and takes the smaller value obtained from the comparison as the number of second spatial streams required for feedback.
  • IEEE802.11ac specifies that the number of actual active antennas of the beamformee must be larger than or equal to the number of columns set by the beamformer in the NDPA message.
  • the number of active antennas of the beamformee may be smaller than the number of columns set by the beamformer in the NDPA message because the beamformer has sent a probing request when the beamformee does not timely inform the beamformer of its reconfiguration or the beamformee cannot detect the actual number of antennas due to an antenna failure, or the like.
  • the beamformer will incorrectly estimate the current channel situation or cannot optimize the communication status, thereby affecting the actual communication effect between the beamformee and the beamformer.
  • the beamformee is capable of feeding back the correct number of current active spatial streams to the beamformer no matter whether the number of actual active antennas of the beamformee is larger than or equal to the number of columns set by the beamformer in the NDPA message.
  • the beamformee feeds back the number of second spatial streams and corresponding spatial stream measurement information to the beamformer.
  • the beamformee After obtaining the number of second spatial streams, the beamformee calculates spatial stream measurement information about the second spatial streams and feeds back the number of second spatial streams and corresponding spatial stream measurement information to the beamformer. Therefore, the beamformer is capable of calculating related operation matrix V according to the spatial stream measurement information to guide subsequent receiving and sending, thereby improving the communication performance of the entire system.
  • the spatial stream measurement information may include: average signal-to-noise ratio (Average SNR) information, feedback matrix V (Feedback Matrix V) information, and delta signal-to-noise ratio (Delta SNR) information that correspond to each spatial stream.
  • Average SNR Average signal-to-noise ratio
  • Feedback matrix V Feedback Matrix V
  • Delta SNR delta signal-to-noise ratio
  • IEEE802.11ac specifies that the number of actual active antennas of the beamformee must be larger than or equal to the number of columns (NC) set by the beamformer in the null data packet announcement (NDPA, Null data packet Announcement) message.
  • the beamformee returns related channel information about each of columns to the beamformer. This enables the beamformer to adjust the communication status according to the related channel information about each of columns. If the number of actual active spatial streams of the beamformee is smaller than the number of columns, the following two results occur: 1.
  • the beamformee may forcedly feed back, according to the number of spatial streams that the number of columns indicates, invalid information about certain spatial streams that are not supported. However, the beamformer does not know this.
  • the beamformer incorrectly estimates the current channel situation and performs incorrect parameter configuration according to the current channel situation; 2. the beamformee may consider that it cannot support the number of spatial streams that the number of columns indicates, so that the beamformee does not send feedback. As such, the information about actual active spatial streams of the beamformee cannot be known by the beamformer. Therefore, the communication status cannot be optimized, greatly affecting the actual communication effect of the beamformee.
  • the beamformee in the embodiment of the present invention takes the smaller value obtained from the comparison as the number of second spatial streams required for feedback and feeds back this correct number of active second spatial streams to the beamformer. In this way, the beamformer is capable of timely knowing its actual communication status and correspondingly optimizing and adjusting the communication status.
  • FIG. 2 another embodiment of a data feedback method according to the embodiments of the present invention includes:
  • a beamformee acquires a null data packet announcement message.
  • a very-high-throughput probing mechanism may be applied to two scenarios: single-user multiple input multiple output (SU-MIMO) and multi-user multiple input multiple output (MU-MIMO) scenarios.
  • SU-MIMO single-user multiple input multiple output
  • MU-MIMO multi-user multiple input multiple output
  • one beamformee communicates with one beamformer (for a specific signaling flowchart, reference may be made to FIG. 3 , where TXOP indicates Transmit Opportunity, and SIFS indicates Short Inter-Frame Space). Therefore, when the beamformee receives a unicast NDPA message, the transmission is SU-MIMO communication if a feedback type (Feedback Type) recorded in a STA Info field in the NDPA message is 0. If a locally stored association ID (AID, Association ID) matches the AID of the STA Info in the NDPA, the NDPA message is what the beamformee requires.
  • AID Association ID
  • the NDPA message received by the beamformees is a broadcast packet sent by the beamformer.
  • this transmission is MU-MIMO communication if the feedback type (Feedback Type) recorded in the STA Info field in the NDPA message is 1, and the beamformee needs to perform AID matching.
  • the beamformee performs association ID matching.
  • the beamformee extracts STA Info fields sequentially from the NDPA message and compares AIDs of the STA Info fields one by one with the locally stored AID. If a same AID is found, AID matching succeeds, which indicates that the NDPA message needs to be locally received. As such, the beamformee needs to feed back spatial stream measurement information, and step 203 is triggered. If a same AID is not found, AID matching fails, which indicates that the beamformee is not the specified one that is requested to send feedback.
  • the beamformee acquires the number of columns from the null data packet announcement.
  • the beamformee After determining that the beamformee is the one requested by the beamformer to send feedback, the beamformee extracts and saves the number of columns and the feedback type of the STA Info from the NDPA message.
  • the beamformee detects the number of active first spatial streams.
  • step 204 the content of step 204 is the same as that of step 102 in the preceding embodiment as shown in FIG. 1 . Therefore, the content is not mentioned herein.
  • the beamformee receives a null data packet message or a beamforming report poll message.
  • the beamformee receives the null data packet (NDP, Null Data Packet) message and detects whether the locally stored AID is equal to the AID of the first STA Info field in the NDPA message, and, if yes, step 206 is triggered;
  • NDP null Data Packet
  • the beamformee detects whether it has received the beamforming report poll (Beamforming report poll) message, and, if yes, step 206 is triggered.
  • Beamforming report poll Beamforming report poll
  • the beamformer first sends a broadcast packet of the NDPA message to instruct all related beamformees to prepare for probing. Then, the beamformer sends a broadcast packet of the NDP message, and all related beamformees calculate related channel feedback information according to the received broadcast packet of the NDP message. It should be noted that after the broadcast packet of the NDP message is received, spatial stream measurement information, which is calculated according to the received NDP message, can be immediately sent to the beamformer only when the AID of a beamformee is equal to the AID of the first STA Info field in the broadcast packet of the received NDPA message.
  • Beamforming Report Poll Beamforming Report Poll
  • the beamformee calculates spatial stream measurement information about each of the second spatial streams.
  • the beamformee calculates the corresponding spatial stream measurement information about each of the second spatial streams according to the received NDP message.
  • the beamformee feeds back the number of second spatial streams and corresponding spatial stream measurement information to the beamformer.
  • the beamformee feeds back the number of second spatial streams and corresponding spatial stream measurement information to the beamformer.
  • This enables the beamformer to calculate, according to the spatial stream measurement information, related operation matrix V to guide subsequent receiving and sending, thereby improving the communication performance of the entire system.
  • the beamformee encapsulates the number of second spatial streams and corresponding spatial stream measurement information in a very high throughput compressed beamforming (VHT Compressed Beamforming) message, and then feeds back the VHT Compressed Beamforming message to the beamformer.
  • VHT Compressed Beamforming very high throughput compressed beamforming
  • Another feedback mechanism can be used to prevent the situation that a beamformer incorrectly estimates the current channel situation or cannot optimize the communication status.
  • FIG. 5 Another embodiment of a data feedback method in the present invention includes:
  • a beamformee acquires the number of columns from a null data packet announcement.
  • the beamformee receives the NDPA message and determines that the beamformee is the one requested by a beamformer to send feedback; and extracts the number of columns in STA Info from the NDPA message, where the number of columns is a field set by the beamformer in the NDPA message and is used to indicate the number of spatial streams that a STA needs to feed back.
  • the beamformee detects the number of active spatial streams.
  • the beamformee detects spatial streams where data transmission exists and determines the number of active spatial streams.
  • the beamformee determines whether the number of spatial streams is smaller than the number of columns.
  • the beamformee determines whether the number of active spatial streams is smaller than the number of columns in the NDPA message. If yes, step 504 is triggered. If not, step 505 is triggered.
  • the beamformee feeds back a null data packet to the beamformer.
  • the beamformee feeds back the null data packet to the beamformer. Specifically, this may be that the beamformee assembles a VHT Compressed Beamforming message, where the VHT Compressed Beamforming message does not carry any spatial stream measurement information, and then feeds back the VHT Compressed Beamforming message to the beamformer.
  • the beamformee feeds back the null data packet to the beamformer. This enables the beamformer to know that the number of actual active spatial streams of the beamformee is smaller than the number of columns set by the beamformer in the NDPA message. In this way, the beamformer is capable of making a timely response, for example, sending a new NDPA message for measurement.
  • the beamformee returns the number of columns and corresponding spatial stream measurement information to the beamformer.
  • the beamformee After determining that the number of active spatial streams is larger than or equal to the number of columns in the NDPA message, the beamformee calculates the number of columns and corresponding spatial stream measurement information according to a received NDP message. After obtaining the corresponding spatial stream measurement information about each of columns, the beamformee returns the corresponding spatial stream measurement information about each of columns to the beamformer. This enables the beamformer to calculate, according to the spatial stream measurement information, related operation matrix Q to guide subsequent receiving and sending, thereby improving the communication performance of the entire system.
  • the operation matrix Q is deduced by the beamformer according to the feedback matrix V information sent by each beamformee and is used to instruct the beamformer to receive and send data.
  • an embodiment of the present invention also provides a related method for a beamformee to solve the problem in feeding back spatial stream measurement information at a beamformer end.
  • an embodiment of a method for sending a null data packet announcement message in the present invention includes:
  • a beamformer acquires the number of active antennas of a beamformee.
  • the beamformer acquires the number of active antennas of the beamformee.
  • the beamformer sets the number of columns in an NDPA message according to the number of antennas.
  • the beamformer needs to send the NDPA message to the beamformee.
  • the beamformer sets the number of columns in the NDPA message according to the number of active antennas of the beamformee so that the number of columns is smaller than the number of antennas.
  • the beamformer sends the NDPA message to the beamformee.
  • the beamformer sends the NDPA message to the beamformee. This enables the beamformee to feed back, according to the NDPA message, the corresponding spatial stream measurement information about each of columns.
  • the beamformer acquires the number of active antennas of the beamformee, so that when framing the NDPA message, the beamformer can set the number of columns according to that the number of active antennas of the beamformee must be larger than or equal to the number of columns in the NDPA message. Therefore, the beamformee end is capable of feeding back correct and valid spatial stream measurement information to the beamformer according to the existing 802.11ac mechanism.
  • the following describes an embodiment in the present invention of a beamformee that is configured to execute the preceding data feedback method.
  • the beamformee in an embodiment of the present invention includes:
  • a first acquiring unit 701 configured to acquire the number of columns from a null data packet announcement NDPA message
  • a detection unit 702 configured to detect the number of active first spatial streams
  • a comparison unit 703 configured to compare the number of first spatial streams with the number of columns, and take the smaller value obtained from the comparison as the number of second spatial streams required for feedback;
  • a feedback unit 704 configured to feed back the number of second spatial streams and spatial stream measurement information about the second spatial streams to a beamformer.
  • the beamformee may further include:
  • a second acquiring unit 705 configured to acquire the NDPA message
  • a matching unit 706 configured to match the AID of a STA Info field in the NDPA message, and trigger the first acquiring unit 701 if AID matching succeeds;
  • a receiving unit 707 configured to receive an NDP message, detect whether a locally stored AID is equal to the AID of the first STA Info field in the NDPA message, and, if yes, trigger the comparison unit 703 ;
  • a measurement information calculating unit 708 configured to calculate spatial stream measurement information about each of second spatial streams according to the received NDP message after the number of second spatial streams required for feedback is determined.
  • the first acquiring unit 701 extracts the number of columns in STA Info from the NDPA message, where the number of columns is a field set by the beamformer in the NDPA message and is used to indicate the number of spatial streams that a STA needs to feed back.
  • the detection unit 702 detects spatial streams where data transmission exists and determines the number of active first spatial streams.
  • the second acquiring unit 705 of the beamformee Before extraction of the number of columns in STA Info from the NDPA message, the second acquiring unit 705 of the beamformee first acquires the NDPA message. If the feedback type (Feedback Type) recorded in the STA Info field in the NDPA message is 0, the transmission is SU-MIMO communication. If the locally cached AID is the same as the AID of the NDPA STA Info field, the NDPA message needs to be received locally, and the beamformee needs to feed back spatial stream measurement information. In addition, the first acquiring unit 701 is triggered. Otherwise, the beamformee is not the specified one that is requested to send feedback.
  • the feedback type Feedback Type
  • AID matching is as follows: The matching unit 706 extracts STA Info fields sequentially from the NDPA message and compares AIDs in the STA Info fields one by one with the locally stored AID. If a same AID is found, AID matching succeeds, which indicates that the NDPA message needs to be locally received. As such, the beamformee needs to feed back the spatial stream measurement information, and the first acquiring unit 701 is triggered. If a same AID is not found, AID matching fails, which indicates that the beamformee is not the specified one that is requested to send feedback.
  • the comparison unit 703 compares the number of active first spatial streams with the number of columns in the NDPA message, and takes the smaller value obtained from the comparison as the number of second spatial streams required for feedback.
  • the receiving unit 707 of the beamformee receives the NDP message and detects whether the AID in the NDP message is equal to the AID of the first STA Info field in the NDPA message. If yes, the comparison unit 703 is triggered.
  • the measurement information calculating unit 708 calculates the corresponding spatial stream measurement information about each of the second spatial streams according to the received NDP message.
  • the feedback unit 704 feeds back the number of second spatial streams and corresponding spatial stream measurement information to the beamformer.
  • This enables the beamformer to calculate, according to the spatial stream measurement information, related operation matrix Q to guide subsequent receiving and sending, thereby improving the communication performance of the entire system.
  • the beamformee encapsulates the number of second spatial streams and corresponding spatial stream measurement information in a very high throughput compressed beamforming (VHT Compressed Beamforming) message, and then feeds back the VHT Compressed Beamforming message to the beamformer.
  • VHT Compressed Beamforming very high throughput compressed beamforming
  • the following describes an embodiment in the present invention of a beamformee that is configured to execute the preceding data feedback method.
  • the beamformee in another embodiment of the present invention includes:
  • a determining unit 803 configured to determine whether the number of spatial streams is smaller than the number of columns, and, if yes, trigger a null data packet feedback unit;
  • a null data packet feedback unit 804 configured to feed back a null data packet to a beamformer.
  • the null data packet feedback unit may include:
  • a null data packet assembly module 8041 configured to assemble a VHT Compressed Beamforming message, where the VHT Compressed Beamforming message does not carry any spatial stream measurement information;
  • a null data packet feedback module 8042 configured to feed back the VHT Compressed Beamforming message to the beamformer.
  • the beamformee receives the NDPA message and determines that the beamformee is the one requested by the beamformer to send feedback; and the unit 801 for acquiring the number of columns extracts the number of columns in STA Info from the NDPA message, where the number of columns is a field set by the beamformer in the NDPA message and is used to indicate the number of spatial streams that a STA needs to feed back.
  • the unit 802 for detecting the number of spatial streams detects spatial streams where data transmission exists and determines the number of active spatial streams.
  • the determining unit 803 determines whether the number of active spatial streams is smaller than the number of columns in the NDPA message. If yes, the null data packet feedback unit 804 is triggered to feed back a null data packet to the beamformer. Specifically, this may be that the null data packet assembly module 8041 assembles the VHT Compressed Beamforming message, where the VHT Compressed Beamforming message does not carry any spatial stream measurement information; and then, the null data packet feedback module 8042 feeds back the VHT Compressed Beamforming message to the beamformer.
  • the following describes an embodiment in the present invention of a beamformer that is configured to execute the preceding method for sending a null data packet announcement message.
  • the beamformer in an embodiment of the present invention includes:
  • a unit 901 for acquiring the number of antennas configured to acquire the number of active antennas of a beamformee during a capability negotiation process between a beamformer and the beamformee;
  • a unit 902 for setting the number of columns configured to set the number of columns in an NDPA message according to the number of antennas so that the number of columns is smaller than the number of antennas;
  • a message sending unit 903 configured to send the NDPA message to the beamformee.
  • the unit 901 for acquiring the number of antennas in the beamformer acquires the number of active antennas of the beamformee.
  • the beamformer After the number of active antennas of the beamformee is acquired, the beamformer needs to send the NDPA message to the beamformee during a very-high-throughput probing process between the beamformer and the beamformee.
  • the unit 902 for setting the number of columns sets the number of columns in the NDPA message according to the number of active antennas of the beamformee so that the number of columns is smaller than the number of antennas.
  • the message sending unit 903 sends the NDPA message to the beamformee.
  • This enables the beamformee to feed back, according to the NDPA message, the corresponding spatial stream measurement information about each of columns.
  • the beamformer acquires the number of active antennas of the beamformee, so that when framing the NDPA message, the beamformer can set the number of columns according to that the number of active antennas of the beamformee must be larger than or equal to the number of columns in the NDPA message. Therefore, the beamformee end is capable of feeding back correct and valid spatial stream measurement information to the beamformer according to the existing 802.11ac mechanism.
  • the disclosed apparatus and method may be implemented in other manners.
  • the described apparatus embodiment is merely exemplary.
  • the unit division is merely logical function division and may be other division in practical implementation.
  • a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed.
  • the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented through some interfaces.
  • the indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms.
  • the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. A part or all of the units may be selected according to the actual needs to achieve the objectives of the solutions of the embodiments.
  • functional units in the embodiments of the present invention may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit.
  • the integrated unit may be implemented in a form of hardware, or may be implemented in a form of a software functional unit.
  • the integrated unit When the integrated units are implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the present invention essentially, or the part contributing to the prior art, or all or a part of the technical solutions may be implemented in the form of a software product.
  • the computer software product is stored in a storage medium and includes several instructions for instructing a computer device (which may be a personal computer, a server, a network device, and the like) to perform all or a part of steps of the methods described in the embodiments of the present invention.
  • the storage medium includes: any medium that can store program codes, such as a USB flash disk, a removable hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disk.
  • program codes such as a USB flash disk, a removable hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disk.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
US13/838,420 2011-09-14 2013-03-15 Data feedback methods and related apparatuses Abandoned US20130215947A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/869,479 US20130235947A1 (en) 2011-09-14 2013-04-24 Data feedback methods and related apparatuses
US15/854,489 US10256874B2 (en) 2011-09-14 2017-12-26 Data feedback methods and related apparatuses

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201110271898.2 2011-09-14
CN201110271898.2A CN103001682B (zh) 2011-09-14 2011-09-14 一种数据反馈方法以及相关装置
PCT/CN2012/081255 WO2013037287A1 (zh) 2011-09-14 2012-09-11 一种数据反馈方法以及相关装置

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/081255 Continuation WO2013037287A1 (zh) 2011-09-14 2012-09-11 一种数据反馈方法以及相关装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/869,479 Continuation US20130235947A1 (en) 2011-09-14 2013-04-24 Data feedback methods and related apparatuses

Publications (1)

Publication Number Publication Date
US20130215947A1 true US20130215947A1 (en) 2013-08-22

Family

ID=47882614

Family Applications (3)

Application Number Title Priority Date Filing Date
US13/838,420 Abandoned US20130215947A1 (en) 2011-09-14 2013-03-15 Data feedback methods and related apparatuses
US13/869,479 Abandoned US20130235947A1 (en) 2011-09-14 2013-04-24 Data feedback methods and related apparatuses
US15/854,489 Active US10256874B2 (en) 2011-09-14 2017-12-26 Data feedback methods and related apparatuses

Family Applications After (2)

Application Number Title Priority Date Filing Date
US13/869,479 Abandoned US20130235947A1 (en) 2011-09-14 2013-04-24 Data feedback methods and related apparatuses
US15/854,489 Active US10256874B2 (en) 2011-09-14 2017-12-26 Data feedback methods and related apparatuses

Country Status (6)

Country Link
US (3) US20130215947A1 (ja)
EP (3) EP3745609A1 (ja)
JP (1) JP5575988B2 (ja)
CN (1) CN103001682B (ja)
ES (1) ES2586828T3 (ja)
WO (1) WO2013037287A1 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170290045A1 (en) * 2016-03-31 2017-10-05 Qualcomm Incorporated Mu-mimo dynamic bandwidth selection
US20190007115A1 (en) * 2017-06-30 2019-01-03 Qualcomm Incorporated Wireless personal area network transmit beamforming
US10194442B2 (en) 2017-02-10 2019-01-29 Qualcomm Incorporated Uplink resources for beam recovery
US20200127718A1 (en) * 2017-06-16 2020-04-23 Interdigital Ce Patent Holdings Method and device for channel sounding
US10893565B2 (en) * 2018-01-10 2021-01-12 Spreadtrum Communications (Shanghai) Co., Ltd. Method for reporting beam reception failure, user equipment, medium and system
US20220303030A1 (en) * 2019-09-12 2022-09-22 Panasonic Intellectual Property Corporation Of America Communication device and communication method

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102304975B1 (ko) * 2014-04-09 2021-09-24 엘지전자 주식회사 사운딩 절차 기반의 프레임 전송 방법 및 장치
US9788317B2 (en) * 2015-03-30 2017-10-10 Intel IP Corporation Access point (AP), user station (STA) and method for channel sounding using sounding trigger frames
CN108024376B (zh) 2016-11-04 2021-06-15 华为技术有限公司 无线局域网中的调度方法、接入点和站点
US10079626B1 (en) * 2017-05-03 2018-09-18 Litepoint Corporation Method for enabling confirmation of expected phase shifts of radio frequency signals emitted from an antenna array
US20220216937A1 (en) * 2021-01-04 2022-07-07 Samsung Electronics Co., Ltd. System and method for downlink feedback
US11510204B1 (en) * 2021-04-30 2022-11-22 Hewlett Packard Enterprise Development Lp Uplink multi-user transmission beamforming in wireless networks

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020193146A1 (en) 2001-06-06 2002-12-19 Mark Wallace Method and apparatus for antenna diversity in a wireless communication system
JP4924106B2 (ja) 2006-04-27 2012-04-25 ソニー株式会社 無線通信システム、並びに無線通信装置及び無線通信方法
JP4356756B2 (ja) 2006-04-27 2009-11-04 ソニー株式会社 無線通信システム、並びに無線通信装置及び無線通信方法
JP4924107B2 (ja) 2006-04-27 2012-04-25 ソニー株式会社 無線通信システム、並びに無線通信装置及び無線通信方法
JP4775288B2 (ja) * 2006-04-27 2011-09-21 ソニー株式会社 無線通信システム、無線通信装置及び無線通信方法
WO2008097629A2 (en) * 2007-02-06 2008-08-14 Interdigital Technology Corporation Method and apparatus for multiple-input multiple-output feedback generation
JP2010081360A (ja) * 2008-09-26 2010-04-08 Toshiba Corp 無線通信装置および無線通信方法
WO2010082509A1 (ja) * 2009-01-19 2010-07-22 日本電気株式会社 Ｓｃｔｐ通信方法
JP5718346B2 (ja) * 2009-10-23 2015-05-13 マーベル ワールド トレード リミテッド データユニットのプリアンブルを生成又は受信する方法及び装置
US8923219B2 (en) * 2010-02-17 2014-12-30 Qualcomm Incorporated Method and apparatus for supporting adaptive channel state information feedback rate in multi-user communication systems
WO2011138777A2 (en) * 2010-05-04 2011-11-10 Celeno Communications Ltd. System and method for channel state related feedback in multi-user multiple-input-multiple-output systems
US9882624B2 (en) * 2010-09-29 2018-01-30 Qualcomm, Incorporated Systems and methods for communication of channel state information

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Stacey et al., Intel, "Proposed TGac Draft Amendment; 11-10-1361-03-00ac-proposed-tgac-draft-amendment", 19 January 2011, IEEE SA Mentor, pp. 1-154. *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170290045A1 (en) * 2016-03-31 2017-10-05 Qualcomm Incorporated Mu-mimo dynamic bandwidth selection
US9999069B2 (en) * 2016-03-31 2018-06-12 Qualcomm Incorporated MU-MIMO dynamic bandwidth selection
US10194442B2 (en) 2017-02-10 2019-01-29 Qualcomm Incorporated Uplink resources for beam recovery
US10728897B2 (en) 2017-02-10 2020-07-28 Qualcomm Incorporated Uplink resources for beam recovery
US20200127718A1 (en) * 2017-06-16 2020-04-23 Interdigital Ce Patent Holdings Method and device for channel sounding
US11711125B2 (en) * 2017-06-16 2023-07-25 Interdigital Ce Patent Holdings Performing enhanced sounding procedures using beamforming techniques
US20190007115A1 (en) * 2017-06-30 2019-01-03 Qualcomm Incorporated Wireless personal area network transmit beamforming
CN110800218A (zh) * 2017-06-30 2020-02-14 高通股份有限公司 无线个域网发射波束成形
US10630357B2 (en) * 2017-06-30 2020-04-21 Qualcomm Incorporated Wireless personal area network transmit beamforming
US10893565B2 (en) * 2018-01-10 2021-01-12 Spreadtrum Communications (Shanghai) Co., Ltd. Method for reporting beam reception failure, user equipment, medium and system
US20220303030A1 (en) * 2019-09-12 2022-09-22 Panasonic Intellectual Property Corporation Of America Communication device and communication method

Also Published As

Publication number Publication date
ES2586828T3 (es) 2016-10-19
EP3113384A1 (en) 2017-01-04
CN103001682B (zh) 2015-03-11
EP3745609A1 (en) 2020-12-02
US20180123655A1 (en) 2018-05-03
EP3113384B1 (en) 2020-02-26
WO2013037287A1 (zh) 2013-03-21
JP2013545370A (ja) 2013-12-19
US20130235947A1 (en) 2013-09-12
EP2605419A4 (en) 2013-09-04
EP2605419B1 (en) 2016-05-18
EP2605419A1 (en) 2013-06-19
CN103001682A (zh) 2013-03-27
JP5575988B2 (ja) 2014-08-20
US10256874B2 (en) 2019-04-09

Similar Documents

Publication Publication Date Title
US10256874B2 (en) Data feedback methods and related apparatuses
US10206172B2 (en) Power save method and station device
CN109547072B (zh) 信道探测的方法、通信设备和计算机可读存储介质
US8824402B2 (en) Apparatus and method for transmitting/receiving data in communication system
US10469148B2 (en) Method and device for channel information feedback
US10390328B2 (en) Beamforming training in orthogonal frequency division multiple access (OFDMA) communication systems
CN113973512A (zh) 用于极高吞吐量探测过程指示的系统和方法
US20140192914A1 (en) Method, device and system for setting a weight feedback granularity
CN111937234B (zh) 用于毫米波mimo模式选择的方法和设备
CN102237907B (zh) 使用顺序响应协议进行数据通信的设备和方法
EP3289720A2 (en) Beamforming training in orthogonal rfequency division multiple access (ofdma) communication systems
CN107707283B (zh) 信道反馈和数据发送方法、基站、用户终端和系统
CN105453651B (zh) 接入点选择方法、终端及接入点
KR101882987B1 (ko) 통신 시스템에서 데이터 송수신 장치 및 방법
CN103051429B (zh) 上行发送分集配置方法及装置
US20140307722A1 (en) Method and apparatus for transmitting beamforming report frame for transmit beamforming
AU2015202083B2 (en) Power save method and station device

Legal Events

Date Code Title Description
AS Assignment

Owner name: HUAWEI TECHNOLOGIES CO., LTD., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAO, ZONGMING;LIU, MENGHONG;XIA, LINFENG;SIGNING DATES FROM 20130409 TO 20130410;REEL/FRAME:030404/0784

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION