WO2016161766A1 - Procédé et appareil de détermination d'informations de canal - Google Patents

Procédé et appareil de détermination d'informations de canal Download PDF

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Publication number
WO2016161766A1
WO2016161766A1 PCT/CN2015/089674 CN2015089674W WO2016161766A1 WO 2016161766 A1 WO2016161766 A1 WO 2016161766A1 CN 2015089674 W CN2015089674 W CN 2015089674W WO 2016161766 A1 WO2016161766 A1 WO 2016161766A1
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Prior art keywords
channel sounding
antenna
determining
channel
sounding signal
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PCT/CN2015/089674
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English (en)
Chinese (zh)
Inventor
林伟
裴智强
刘向凤
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中兴通讯股份有限公司
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Publication of WO2016161766A1 publication Critical patent/WO2016161766A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for determining channel information.
  • the traditional wireless local area network (WLAN) channel detection is performed in a full bandwidth manner, that is, each antenna transmits all bandwidth subcarriers, and the antennas are isolated by using an orthogonal matrix. Multiple antennas need multiple orthogonalities. Orthogonal Frequency Division Multiplexing (OFDM) symbols are used for detection, and the efficiency of detection is low in the case of multiple antennas.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the present invention provides a method and apparatus for determining channel information to at least solve the problem of low channel detection efficiency existing in the related art.
  • a method for determining channel information comprising: transmitting a channel sounding request frame to a station STA, wherein the channel sounding request frame is configured to request to send a channel sounding signal to the STA,
  • the channel sounding request frame carries a system frame number SFN for determining an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the access point AP; and sending the channel sounding signal frame to the STA,
  • the channel sounding signal frame carries the channel sounding signal; wherein the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal are used to determine the station STA Channel information with the AP.
  • sending the channel sounding signal frame to the STA includes: following a predetermined time interval after the channel sounding request frame is sent, according to an orthogonal codeword configured on each antenna of the AP
  • the STA transmits the channel sounding signal frame.
  • the method further includes: determining, according to the SFN, an index value in an orthogonal code block corresponding to each antenna; grouping according to the index value in the orthogonal code block and a predetermined orthogonal codeword group The index value determines an orthogonal codeword index value corresponding to the orthogonal codeword.
  • the sending, by the STA, the channel sounding signal frame includes: after the predetermined time interval after the channel sounding request frame is sent, transmitting, according to each antenna of the AP, the channel sounding The channel sounding signal frame is transmitted at an index position of a subcarrier of the signal.
  • the method further includes: determining a number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP; determining an index offset ⁇ f according to the SFN; The number of subcarriers, the ⁇ f, and the number of transmitted symbols corresponding to the channel sounding signal determine the subcarrier index position configured on each antenna of the AP.
  • determining the number of subcarriers configured to send the channel sounding signal frame configured on each antenna of the AP includes: determining, by using the following formula, the number of the subcarriers configured on each antenna: Where Ka is the number of antennas of the AP, and SC BW is the total number of subcarriers allocated to each antenna of the AP.
  • a method for determining channel information comprising: receiving an access point AP to transmit a channel sounding request frame, wherein the channel sounding request frame is configured to request to send a channel sounding signal, the channel
  • the probe request frame carries a system frame number SFN, and receives a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries the channel sounding signal; and determining, according to the SFN, each antenna of the AP Orthogonal codeword index value and/or subcarrier index position configured; determining, by the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal, the station STA and the AP Channel information between.
  • receiving the channel sounding signal frame sent by the AP includes: after receiving the predetermined time interval after the AP sends the channel sounding request frame, according to the positive configuration configured on each antenna of the AP The channel sounding signal frame transmitted by the code word.
  • determining, according to the SFN, the orthogonal codeword index value configured on each antenna port of the AP determining, according to the SFN, an index value of an orthogonal codeword group corresponding to each antenna;
  • the orthogonal codeword group index value and the pre-received orthogonal codeword grouping of the channel sounding of the AP sent by the AP The index determines the orthogonal codeword index value.
  • receiving the channel sounding signal frame sent by the AP after receiving the predetermined time interval after the AP sends the channel sounding request frame, configured according to each antenna configured on the AP
  • the channel sounding signal frame transmitted by the index position of the subcarrier transmitting the channel sounding signal.
  • determining the subcarrier index position configured on each antenna of the AP according to the SFN includes: determining a number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP; Determining, by the SFN, an index offset ⁇ f; determining, according to the determined number of the subcarriers, the ⁇ f, and the number of transmitted symbols corresponding to the channel sounding signal sent by the AP, determining configuration on each antenna of the AP The subcarrier index position.
  • determining the number of subcarriers configured to send the channel sounding signal frame configured on each antenna of the AP includes: determining, by using the following formula, the number of the subcarriers configured on each antenna: Where Ka is the number of antennas of the AP, and SC BW is the total number of subcarriers allocated to each antenna of the AP.
  • determining channel information between the STA and the AP according to the subcarrier index position and the channel sounding signal includes: according to each antenna of the AP received at the subcarrier index position The channel sounding signal estimates channel information between the STA and the AP; and determines channel information between the STA and the AP by performing interpolation processing on the result of the estimation.
  • apparatus for determining channel information comprising: a first transmitting module configured to transmit a channel sounding request frame to a station STA, wherein the channel sounding request frame is used to request to The STA sends a channel sounding request signal, where the channel sounding request frame carries a system frame number SFN for determining an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the access point AP; ,Assume And sending the channel sounding signal frame to the STA, where the channel sounding signal frame carries the channel sounding signal; wherein the orthogonal codeword index value and/or the subcarrier index position And the channel sounding signal is used to determine channel information between the station STA and the AP.
  • the second sending module includes: after the predetermined time interval after the channel sounding request frame is sent, the sending to the STA according to an orthogonal codeword configured on each antenna of the AP Channel sounding signal frame.
  • the device further includes: a first determining module, configured to determine, according to the SFN, an index value of an orthogonal code block group corresponding to each antenna; and a second determining module, configured to be according to the orthogonal code
  • the intra-word index value and the predetermined orthogonal codeword packet index value determine an orthogonal codeword index value corresponding to the orthogonal codeword.
  • the second sending module includes: after a predetermined time interval after the channel sounding request frame is sent, according to the subcarriers configured to transmit the channel sounding signal configured on each antenna of the AP The channel sounding signal frame transmitted by the index position.
  • the device further includes: a third determining module, configured to determine a number of subcarriers configured to send the channel sounding signal frame configured on each antenna of the AP; and a fourth determining module, configured to The SFN determines an index offset ⁇ f; the fifth determining module is configured to determine, according to the determined number of the subcarriers, the ⁇ f, and the number of transmitted symbols corresponding to the channel sounding signal, each antenna of the AP is determined.
  • the subcarrier index position configured on.
  • the third determining module includes: determining, by using the following formula, the number of the subcarriers configured on each antenna: Where Ka is the number of antennas of the AP, and SC BW is the total number of subcarriers allocated to each antenna of the AP.
  • a device for determining channel information includes: a first receiving module, The channel sounding request frame is configured to receive a channel sounding request frame, where the channel sounding request frame is used to request that the channel sounding signal is sent by the AP, where the channel sounding request frame carries a system frame number SFN; a receiving module, configured to receive a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries the channel sounding signal; and a sixth determining module, configured to determine each of the APs according to the SFN An orthogonal codeword index value and/or a subcarrier index position configured on the antenna; a seventh determining module configured to be based on the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal Determining channel information between the STA and the AP.
  • the second receiving module includes: after receiving the predetermined time interval after the AP sends the channel sounding request frame, according to the orthogonal codeword configured on each antenna of the AP, The channel sounding signal frame.
  • the sixth determining module when determining the orthogonal codeword index value configured on each antenna port of the AP according to the SFN, includes: a first determining unit, configured to determine according to the SFN The index value of the orthogonal code block group corresponding to each antenna; the second determining unit is configured to detect according to the index value in the orthogonal code block group and the channel channel of the AP that is sent by the AP and received in advance The orthogonal codeword packet index value determines the orthogonal codeword index value.
  • the second receiving module includes: after receiving the predetermined time interval after the AP sends the channel sounding request frame, configured to send the channel sounding signal according to each antenna configured on the AP The channel sounding signal frame transmitted by the index position of the subcarrier.
  • the sixth determining module when determining a subcarrier index position configured on each antenna of the AP according to the SFN, includes: a third determining unit, configured to determine configuration on each antenna of the AP a number of subcarriers for transmitting the channel sounding signal frame; a fourth determining unit configured to determine an index offset ⁇ f according to the SFN; and a fifth determining unit, configured to determine, according to the determined number of the subcarriers, The ⁇ f and the number of transmitted symbols corresponding to the channel sounding signal sent by the AP determine the subcarrier index position configured on each antenna of the AP.
  • the third determining unit includes: determining, by using the following formula, the number of the subcarriers configured on each antenna: Where Ka is the number of antennas of the AP, and SC BW is the total number of subcarriers allocated to each antenna of the AP.
  • the seventh determining module when determining channel information between the STA and the AP according to the subcarrier index position and the channel sounding signal, includes: an estimating unit, configured to A channel sounding signal of each antenna of the AP received at a subcarrier index position estimates channel information between the STA and the AP; a sixth determining unit is configured to perform interpolation processing on a result of the estimation The manner of determining channel information between the STA and the AP.
  • a channel sounding request frame is sent to a station STA, wherein the channel sounding request frame is used to request to send a channel sounding signal to the STA, where the channel sounding request frame carries an identifier for determining an access point AP.
  • FIG. 1 is a flowchart of a method for determining a first type of channel information according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for determining second channel information according to an embodiment of the present invention
  • FIG. 3 is a structural block diagram of a first apparatus for determining channel information according to an embodiment of the present invention
  • FIG. 4 is a block diagram 1 of a preferred structure of a first apparatus for determining channel information according to an embodiment of the present invention
  • FIG. 5 is a second structural block diagram of a first apparatus for determining channel information according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a second apparatus for determining channel information according to an embodiment of the present invention.
  • FIG. 7 is a structural block diagram 1 of a sixth determining module 66 in a second channel information determining apparatus according to an embodiment of the present invention.
  • FIG. 8 is a second structural block diagram of a sixth determining module 66 in a second channel information determining apparatus according to an embodiment of the present invention.
  • FIG. 9 is a structural block diagram of a seventh determining module 68 in a second channel information determining apparatus according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a downlink channel sounding process according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of frequency domain resource spacing allocation according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for determining channel information according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:
  • Step S102 Send a channel sounding request frame to the station STA, where the channel sounding request frame is used to request to send a channel sounding signal to the STA, where the channel sounding request frame carries a positive configuration on each antenna for determining the access point AP.
  • Step S104 Send a channel sounding signal frame to the STA, where the channel sounding signal frame carries a channel sounding signal; wherein the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal are used to determine the station.
  • Channel information between the STA and the AP is used to determine the station.
  • the channel information is determined according to the orthogonal codeword index value and/or the subcarrier index position and the channel sounding information, so that the channel information of the full-bandwidth full antenna can be effectively obtained by a single training symbol or the frequency domain and the time domain can be improved.
  • the diversity gain thereby improving the efficiency of acquiring channel information, and determining the channel condition based on the acquired channel information, for example, the channel quality, thereby improving the efficiency of channel sounding. Therefore, the problem of low channel detection efficiency existing in the related art is solved, thereby achieving the effect of improving channel detection efficiency.
  • the orthogonal time may be configured according to each antenna of the AP after a predetermined time interval after the channel sounding request frame is sent.
  • the codeword sends a channel sounding signal frame to the STA, and the predetermined time interval may be a short interframe spacing interval.
  • the orthogonal codeword may also be determined, including: determining, according to the SFN, an index value in an orthogonal code block corresponding to each antenna; according to an index value in the orthogonal code block and a predetermined orthogonality
  • the codeword packet index value determines an orthogonal codeword index value corresponding to the orthogonal codeword. Further, the channel sounding signal is transmitted according to the orthogonal codewords configured on the respective antennas.
  • the sending the channel sounding signal frame to the STA may include: following a predetermined time interval after the channel sounding request frame is sent, according to the sub-configurant for transmitting the channel sounding signal configured on each antenna of the AP.
  • the index position of the carrier transmits a channel sounding signal frame, and the predetermined time interval may be a short inter-frame spacing interval.
  • the foregoing method further includes acquiring an index position of the subcarrier.
  • the channel for detecting the channel may be configured according to each antenna of the AP after a predetermined time interval after the channel probe request frame is sent.
  • the index position of the subcarrier of the signal is obtained before the channel sounding signal is sent.
  • the subcarrier index position is obtained.
  • the subcarrier index position may be acquired at other times.
  • the index position of the subcarrier is obtained by determining the channel for transmitting on each antenna of the AP.
  • Determining the number of subcarriers of the signal frame determining the index offset ⁇ f according to the SFN; determining the subcarrier index configured on each antenna of the AP according to the determined number of subcarriers, ⁇ f, and the number of transmitted symbols corresponding to the channel sounding signal position.
  • the number of subcarriers configured on each antenna may be determined by using the following formula: Where Ka is the number of antennas of the AP, and SC BW is the total number of subcarriers allocated to each antenna of the AP.
  • FIG. 2 is a flowchart of a method for determining second channel information according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:
  • Step S202 receiving a channel sounding request frame sent by the access point AP, wherein the channel sounding request frame is used to request that the channel sounding signal is sent by the AP, where the channel sounding request frame carries the system frame number SFN;
  • Step S204 receiving a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries a channel sounding signal;
  • Step S206 determining, according to the SFN, an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the AP;
  • Step S208 determining channel information between the station STA and the AP according to the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal.
  • the channel information between the STA and the AP when determining the channel information between the STA and the AP, it may be determined according to the orthogonal codeword index value and/or the subcarrier index position and the channel sounding information, and the single training symbol can be effectively obtained to obtain the full bandwidth.
  • the channel information of the antenna or the diversity gain in the frequency domain and the time domain is improved, thereby improving the efficiency of acquiring channel information, thereby improving the efficiency of channel sounding. Therefore, the problem of low channel detection efficiency existing in the related art is solved, thereby achieving the effect of improving channel detection efficiency.
  • the channel sounding signal frame sent by the receiving AP may have multiple receiving modes.
  • the receiving AP may be configured on each antenna of the AP after a predetermined time interval after the channel probe request frame is sent.
  • the channel sounding signal frame transmitted by the orthogonal codeword may be a short interframe spacing interval.
  • determining the orthogonal codeword index value there may be multiple determining manners.
  • determining the orthogonal codeword index value configured on each antenna port of the AP according to the SFN includes: determining according to the SFN. An index value in an orthogonal code block corresponding to each antenna; an orthogonal codeword index value is determined according to an index value in the orthogonal code block and an orthogonal codeword packet index value of the channel sounding of the AP transmitted by the AP received in advance.
  • the pre-received orthogonal codeword packet index value may be sent to the STA by the AP in advance through the beacon frame or by other means.
  • the receiving AP when receiving the channel sounding signal frame sent by the AP, the receiving AP may be configured to send according to each antenna configured on the antenna after the predetermined time interval after the channel sounding request frame is sent.
  • a channel sounding signal frame transmitted by an index position of a subcarrier of the channel sounding signal, and the predetermined time interval may be a short interframe space interval.
  • determining, according to the SFN, a subcarrier index position configured on each antenna of the AP includes: determining a number of subcarriers configured to transmit a channel sounding signal frame configured on each antenna of the AP; determining an index according to the SFN Offset ⁇ f; determining the subcarrier index position configured on each antenna of the AP according to the determined number of subcarriers, ⁇ f, and the number of transmitted symbols corresponding to the channel sounding signal transmitted by the AP.
  • ⁇ f mod(SFN, SC BW ), where SC BW is the total number of subcarriers allocated by each antenna of the AP;
  • the determining the number of subcarriers for transmitting the channel sounding signal frame configured on each antenna of the AP includes: determining the number of subcarriers configured on each antenna by using the following formula: Where Ka is the number of antennas of the AP, and SC BW is the total number of subcarriers allocated to each antenna of the AP.
  • determining channel information between the station STA and the AP according to the subcarrier index position and the channel sounding signal comprises: pairing the STA according to the channel sounding signal of each antenna of the AP received at the subcarrier index position
  • the channel information between the AP and the AP is determined by performing channel interpolation on the estimated result.
  • a device for determining the channel information is provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 3 is a structural block diagram of a first apparatus for determining channel information according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes a first transmitting module 32 and a second transmitting module 34. The apparatus will be described below.
  • the first sending module 32 is configured to send a channel sounding request frame to the station STA, where the channel sounding request frame is used to request to send a channel sounding signal to the STA, where the channel sounding request frame carries each of the determining access point APs. a system frame number SFN of the orthogonal codeword index value and/or the subcarrier index position configured on the antenna; the second sending module 34 is connected to the first sending module 32, and configured to send a channel sounding signal frame to the STA, where The channel sounding signal frame carries a channel sounding signal; wherein the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal are used to determine channel information between the station STA and the AP.
  • the foregoing second sending module 34 includes: a channel sounding signal sent to the STA according to an orthogonal codeword configured on each antenna of the AP after a predetermined time interval after the channel sounding request frame is transmitted.
  • the frame, the predetermined time interval may be a short interframe spacing interval.
  • FIG. 4 is a block diagram of a preferred structure of a first channel information determining apparatus according to an embodiment of the present invention.
  • the apparatus includes a first determining module 42 and all but the modules shown in FIG.
  • the second determining module 44 it should be noted that the positional relationship between the first determining module 42 and the second determining module 44 and each module in FIG. 3 may be multiple, and the index value in the orthogonal codeword group is determined first.
  • the orthogonal codeword index value is sent to the STA as an example for description.
  • the first determining module 42 is configured to determine an index value of the orthogonal code block group corresponding to each antenna according to the SFN; the second determining module 44 is connected to the first determining module 42 and the second sending module 34, and is configured to be orthogonal according to the orthogonality code
  • the intra-word index value and the predetermined orthogonal codeword packet index value determine an orthogonal codeword index value corresponding to the orthogonal codeword.
  • the foregoing second sending module 34 may include: a channel sounding signal frame that is sent according to an index position of a subcarrier for transmitting a channel sounding signal configured on each antenna of the AP after a predetermined time interval after the channel sounding request frame is transmitted.
  • the predetermined time interval may be a short interframe spacing interval.
  • the apparatus includes a third determining module 52, in addition to all the modules shown in FIG.
  • the fourth determining module 54 and the fifth determining module 56 it should be noted that the positional relationship between the third determining module 52, the fourth determining module 54, and the fifth determining module 56 and each module in FIG. 3 may be multiple.
  • the index offset and the subcarrier index position are determined by determining the number of subcarriers first, and then the channel sounding signal frame is sent to the STA as an example for description.
  • the third determining module 52 is configured to determine the number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP
  • the fourth determining module 54 is connected to the third determining module 52, and is configured to determine an index according to the SFN.
  • the fifth determining module 56 is connected to the fourth determining module 54 and the second sending module 34, and is configured to determine the AP according to the determined number of subcarriers, ⁇ f, and the number of transmitted symbols corresponding to the channel sounding signal.
  • the subcarrier index position configured on each antenna.
  • the foregoing third determining module 52 includes: determining the number of subcarriers configured on each antenna by using the following formula: Where Ka is the number of antennas of the AP, and SC BW is the total number of subcarriers allocated to each antenna of the AP.
  • FIG. 6 is a structural block diagram of a second apparatus for determining channel information according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes a first receiving module 62, a second receiving module 64, a sixth determining module 66, and a seventh. The module 68 is determined and the device will be described below.
  • the first receiving module 62 is configured to receive a channel sounding request frame sent by the access point AP, where the channel sounding request frame is used to request that the channel sounding signal is sent by the AP, where the channel sounding request frame carries the system frame number SFN;
  • the second receiving module 64 is connected to the first receiving module 62, and is configured to receive a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries a channel sounding signal; and the sixth determining module 66 is connected to the foregoing
  • the second receiving module 64 is configured to determine an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the AP according to the SFN;
  • the seventh determining module 68 is connected to the sixth determining module 66, and is configured to be The codeword index value and/or the subcarrier index position, and the channel sounding signal determine channel information between the station STA and the AP.
  • the foregoing second receiving module 64 includes: after receiving a predetermined time interval after the channel probe request frame is sent, the channel detection is performed according to orthogonal codewords configured on each antenna of the AP.
  • the signal frame, the predetermined time interval may be a short inter-frame spacing interval.
  • FIG. 7 is a structural block diagram 1 of a sixth determining module 66 in a second channel information determining apparatus according to an embodiment of the present invention.
  • the sixth determining module 66 includes a first determining unit 72 and a second determining. Unit 74, the sixth determination module 66 is described below.
  • the first determining unit 72 is configured to: when determining an orthogonal codeword index value configured on each antenna port of the AP according to the SFN, determining an index value of the orthogonal codeword group corresponding to each antenna according to the SFN; the second determining unit 74, The first determining unit 72 is connected to the first determining unit 72, and is configured to determine an orthogonal codeword index value according to an index value in the orthogonal codeword group and a pre-received orthogonal codeword packet index value of the channel sounding of the AP transmitted by the AP.
  • the foregoing second receiving module 64 may further include: receiving, by the AP, channel probes that are sent according to an index position of a subcarrier for transmitting a channel sounding signal configured on each antenna of the AP after a predetermined time interval after the channel probe request frame is transmitted.
  • the signal frame, the predetermined time interval may be a short inter-frame spacing interval.
  • FIG. 8 is a second structural block diagram of a sixth determining module 66 in a second channel information determining apparatus according to an embodiment of the present invention.
  • the sixth determining module 66 includes a third determining unit 82 and a fourth determining.
  • the unit 84 and the fifth determining unit 86 are described below.
  • the sixth determining module 66 is described below.
  • the number of subcarriers configured on each antenna may be determined first, and the subcarrier index position may be determined, or the subcarrier index position may be determined first. Then, the number of subcarriers configured on each antenna is determined.
  • the first case is taken as an example for description.
  • the third determining unit 82 is configured to determine the number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP, and the fourth determining unit 84 is connected to the third determining unit 82, and is configured to When the SFN determines the subcarrier index position configured on each antenna of the AP, the index offset ⁇ f is determined according to the SFN; the fifth determining unit 86 is connected to the fourth determining unit 84, and is set according to the determined number of subcarriers, ⁇ .
  • the index of the number of transmitted symbols corresponding to the channel sounding signal sent by the AP determines the subcarrier index position configured on each antenna of the AP.
  • ⁇ f mod(SFN, SC BW ), where SC BW is the total number of subcarriers allocated to each antenna of the AP;
  • the third determining unit 82 includes: determining the number of subcarriers configured on each antenna by using the following formula: Where Ka is the number of antennas of the AP, and SC BW is the total number of subcarriers allocated to each antenna of the AP.
  • FIG. 9 is a structural block diagram of a seventh determining module 68 in the second channel information determining apparatus according to an embodiment of the present invention. As shown in FIG. 9, the seventh determining module 68 includes an estimating unit 92 and a sixth determining unit 94. The seventh determination module 68 will be described below.
  • the estimating unit 92 is configured to estimate channel information between the STA and the AP according to the channel sounding signals of the respective antennas of the APs received at the subcarrier index position; the sixth determining unit 94 is connected to the estimating unit 92, and is configured to The channel information between the STA and the AP is determined by performing interpolation processing on the estimated result.
  • the following describes the channel sounding process, the broadcast information configuration process, and the specific channel information determination process.
  • FIG. 10 is a schematic diagram of a downlink channel sounding process according to an embodiment of the present invention. The channel sounding process will be described below with reference to FIG.
  • the AP sends a channel sounding request frame to the STA, where the channel sounding request frame includes a sounding sequence index value;
  • the AP After the channel probe request frame is sent, the AP sends a channel sounding frame immediately after the short Interframe Spacing (SIFS) interval;
  • SIFS short Interframe Spacing
  • the STA After receiving the channel sounding request frame, the STA acquires the sounding sequence index value carried by the channel sounding request frame;
  • the STA After receiving the channel sounding request frame, the STA continues to receive the channel sounding frame after the subsequent SIFS interval;
  • the STA After receiving the channel sounding frame, the STA combines the sounding sequence index value carried by the channel sounding request frame, calculates a channel sounding sequence corresponding to the transmitting end, and estimates channel information corresponding to the air interface between the AP transmitting end and the STA receiving end according to the sounding sequence;
  • the high layer signaling notifies the channel sounding orthogonal codeword packet index value configured by the current AP; wherein the orthogonal codewords are grouped according to four orthogonal sequences, each packet corresponding to a different AP, and each group of intra-group codewords respectively Can be configured to different antennas of the AP;
  • the AP carries the channel sounding orthogonal codeword packet index value configured by the AP and the maximum transmit spatial stream number/antenna port number of the AP in the beacon frame of the AP;
  • the STA After obtaining the Beacon frame of the AP, the STA obtains the channel sounding orthogonal codeword packet index value configured by the AP and the maximum transmit spatial stream/antenna port number of the AP;
  • the AP broadcasts the orthogonal codeword packet index value of the channel sounding of the AP through the Beacon frame;
  • the STA may acquire an orthogonal codeword sequence group of the AP channel detection
  • the AP sends a channel sounding request frame and carries the probe sequence index value SFN.
  • Different orthogonal transmit code antennas are allocated to different transmit antennas at the AP end;
  • the antenna port and the codeword index can be fixedly mapped, as shown in Table 1;
  • Antenna index Antenna port 0 Antenna port 1 ... Antenna port N Codeword index Orthogonal codeword 0 Orthogonal codeword 1 ... Orthogonal codeword N
  • the antenna port and the codeword index may be determined according to the detection index value SFN, as shown in the following table;
  • Ci mod(nka+SFN, Ka)
  • Ka is the number of antennas
  • Ci is the corresponding codeword index value
  • nka is the antenna port index value
  • the STA receives the channel sounding request frame, acquires the sounding sequence index value SFN information, calculates an index value of the orthogonal codeword group corresponding to each antenna port according to the SFN information, and performs orthogonal codeword grouping according to the Beacon frame. By indexing and combining the index values in the orthogonal code block, the true orthogonal codeword index value of each antenna port configuration can be calculated;
  • each antenna of the AP performs channel sounding frame signal transmission according to the allocated orthogonal codeword
  • the STA receives the channel sounding frame signal acquired in the receiving time slot of the sounding frame signal, and performs channel estimation according to the orthogonal codeword corresponding to the antenna, and acquires channel information of the full bandwidth of the multiple antennas between the AP and the STA;
  • the AP sends a channel sounding request frame and carries the probe sequence index value SFN.
  • the AP calculates the frequency domain resources allocated by different transmit antennas
  • Ka is the number of antennas, and the number of SC BW bandwidth subcarriers
  • Calculating a subcarrier index value corresponding to each antenna, and the frequency domain resource allocation of the antenna is related to the channel sounding sequence index value, the number of transmitting antennas, and the index value of the transmitted symbol number;
  • ⁇ f mod(SFN, SC BW ), ⁇ f is an index offset, and SFN is a sequence index value of a channel sounding frame;
  • Ki i, corresponding to the assigned ith antenna
  • the STA receives the channel sounding request frame, and acquires the sounding sequence index value SFN information;
  • each antenna transmits the sounding signal according to the allocated subcarrier position
  • the STA obtains the channel offset of each antenna according to the obtained index offset ⁇ f value and the corresponding transmission symbol index value (the transmission symbol index value refers to the index value of the number of OFDM symbols transmitted by the transmitting end).
  • the subcarrier index position corresponding to the signal is obtained, and the channel sounding signal corresponding to each antenna is obtained, and the channel estimation is performed according to the received channel sounding signal, and interpolation is performed between the frequency points to obtain a channel with full bandwidth of multiple antennas between the AP and the STA. information.
  • the following is a 20M bandwidth
  • the AP is configured with 4 antennas and the 802.11n standard, and different orthogonal codeword configurations are adopted between the antennas.
  • the detection sequence index value SFN is 1, and the orthogonal codeword packet index value of the AP configuration is 1, indicating that the present invention has many The way the antenna channel is detected.
  • the AP broadcasts the orthogonal codeword packet index value 1 of the channel sounding of the AP through the Beacon frame;
  • the STA may acquire an orthogonal codeword sequence group of the AP channel detection
  • the AP sends a channel sounding request frame and carries the probe sequence index value SFN.
  • Different orthogonal transmit code antennas are allocated to different transmit antennas at the AP end;
  • Ka is the number of antennas
  • Ci is the index value in the corresponding codeword group
  • nka is the antenna port index value
  • the obtained antenna port and the index value in the orthogonal code block are as shown in Table 2:
  • Antenna index Antenna port 0 Antenna port 1 Antenna port 2 Antenna port 3 Codeword index Orthogonal codeword 1 Orthogonal codeword 2 Orthogonal codeword 3 Orthogonal codeword 0
  • the STA receives the channel sounding request frame, obtains the sounding sequence index value SFN information, calculates an index value of the orthogonal codeword group corresponding to each antenna port according to the SFN information, and uses the orthogonal codeword grouping index value obtained according to the Beacon frame and combines the orthogonality.
  • the index value in the codeword group can be used to calculate the true orthogonal codeword index value of each antenna port configuration, as shown in Figure 3.
  • each antenna of the AP performs detection signal transmission according to the assigned orthogonal codeword. give away;
  • the STA receives the channel sounding signal acquired in the receiving time slot of the sounding signal, and performs channel estimation on the received channel sounding signal according to the orthogonal codeword corresponding to the antenna, and acquires channel information of the full bandwidth of the multiple antennas between the AP and the STA;
  • the following is a 20M bandwidth, AP configuration 4 antenna, 802.11n standard, inter-antenna frequency domain resource spacing allocation as an example, and the detection sequence index value SFN is 1, indicating the multi-antenna channel detection mode of the present invention.
  • 11 is a schematic diagram of frequency domain resource spacing allocation according to an embodiment of the present invention, where pi identifies an antenna index. The present embodiment will be described below with reference to FIG.
  • the AP sends a channel sounding request frame and carries the probe sequence index value SFN.
  • the AP calculates the frequency domain resources of different transmit antennas.
  • Ki 0, assign antenna 0;
  • the STA receives the channel sounding request frame, obtains the sounding sequence index value SFN information, and calculates an index offset ⁇ f value;
  • each antenna performs channel sounding signal transmission according to the allocated subcarrier position
  • the STA obtains the subcarrier index position corresponding to the channel sounding signal of each antenna according to the obtained index offset ⁇ f value and the corresponding received symbol number in the receiving time slot of the received sounding signal, and acquires the channel sounding signal corresponding to each antenna.
  • Channel estimation is performed according to the received channel sounding signal, and interpolation is performed between the frequency points to obtain channel information of the full bandwidth of multiple antennas between the AP and the STA.
  • the multi-antenna channel detection is simultaneously performed by using the code division or the frequency division between the detection antennas, and the channel information of the full-bandwidth full antenna can be obtained by the single training symbol at the fastest time, and the channel information is improved.
  • the efficiency of channel sounding; at the same time, the frequency domain resource allocation between the antennas or the codeword resource allocation is associated with the channel sounding sequence index value, which can not only improve the diversity gain in the frequency domain and the time domain, but also reduce the influence of the same frequency interference.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the method and apparatus for determining channel information provided by the embodiments of the present invention have the following beneficial effects: the problem of low channel detection efficiency in the related art is solved, and the effect of improving channel detection efficiency is achieved.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de détermination d'informations de canal, le procédé comportant les étapes consistant à: envoyer une trame de demande de détection de canal à une station (STA), la trame de demande de détection de canal étant utilisée pour demander l'envoi d'un signal de détection de canal à la STA, et la trame de demande de détection de canal transportant un numéro de trame de système (SFN) utilisé pour déterminer une valeur d'indice de mot de code orthogonal et/ou un emplacement d'indice de sous-porteuse configurés sur chaque antenne d'un point d'accès (AP); et envoyer une trame de signal de détection de canal à la STA, la trame de signal de détection de canal transportant le signal de détection de canal, et la valeur d'indice de mot de code orthogonal et/ou l'emplacement d'indice de sous-porteuse et le signal de détection de canal étant utilisés pour déterminer des informations de canal entre la station (STA) et l'AP. Au moyen de la présente invention, le problème rencontré dans la technique apparentée, où le rendement de détection de canaux est faible, est résolu, ce qui a pour effet d'améliorer le rendement de détection de canaux.
PCT/CN2015/089674 2015-04-10 2015-09-15 Procédé et appareil de détermination d'informations de canal WO2016161766A1 (fr)

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WO2012093794A2 (fr) * 2011-01-03 2012-07-12 Lg Electronics Inc. Procédé de sondage de canal dans un système de réseau local sans fil et appareil pour sa prise en charge
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CN104303542A (zh) * 2012-03-16 2015-01-21 高通股份有限公司 将话务卸载到无线局域网的系统和方法
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