WO2016192520A1 - Procédé d'acquisition, procédé d'envoi, dispositif d'acquisition et dispositif d'envoi d'informations de canal - Google Patents

Procédé d'acquisition, procédé d'envoi, dispositif d'acquisition et dispositif d'envoi d'informations de canal Download PDF

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Publication number
WO2016192520A1
WO2016192520A1 PCT/CN2016/081904 CN2016081904W WO2016192520A1 WO 2016192520 A1 WO2016192520 A1 WO 2016192520A1 CN 2016081904 W CN2016081904 W CN 2016081904W WO 2016192520 A1 WO2016192520 A1 WO 2016192520A1
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Prior art keywords
channel information
channel
information
segment
subcarrier group
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PCT/CN2016/081904
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English (en)
Chinese (zh)
Inventor
邢卫民
田开波
孙波
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中兴通讯股份有限公司
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Publication of WO2016192520A1 publication Critical patent/WO2016192520A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines

Definitions

  • This document relates to, but is not limited to, the field of communications, and in particular, to a channel information acquisition method, a transmission method, an acquisition device, and a transmission device.
  • Wireless Local Area Network uses Orthogonal Frequency Division Multiplexing (OFDM) transmission technology, while 802.11n Introducing Multiple Input Multiple Output (MIMO) and beamforming technologies, the 802.11 standard inherits OFDM and MIMO as a basic technology.
  • OFDM Orthogonal Frequency Division Multiplexing
  • MIMO Multiple Input Multiple Output
  • FIG. 1 is a schematic diagram of a WLAN basic service set in the related art.
  • the sender needs to know the current wireless channel status, and the process of the transmitter acquiring the channel state is called a sounding process, and specifically includes a beamformer to transmit a measurement signal, and a channel feedback party (beamformee).
  • Beamformee channel feedback party
  • FIG. 2 is a schematic diagram of the probe report transmission in the related art.
  • the probe sends a notification.
  • the frame informs the feedback party to perform channel measurement, and sends a sounding signal after the notification frame, the feedback party detects the sounding signal, measures the estimated channel state, and generates a measurement report, because the measurement report greatly exceeds the supported single data unit block.
  • the large length, the feedback party segments the feedback report according to the rules defined in the related art, wherein all segments except the last segment are of a fixed size and equal to the maximum length of the supported data block.
  • the feedback party aggregates the above segments and sends them to the probe side together. If the segment 2 is subjected to the interference reception error during the first transmission, the probe sends a feedback report poll frame to the feedback party, requesting the retransmission segment 2 And indicates that other segments do not need to be retransmitted. This avoids retransmission of the entire measurement report every time an error occurs. However, the probe party needs to obtain segment 2 to obtain complete channel information, so if any segment fails, the above retransmission process is necessary.
  • the embodiment of the invention provides a channel information acquisition method, a sending method, an obtaining device and a sending device, which can reduce the overhead of network retransmission segmentation.
  • a channel information acquisition method including: receiving N segment frames sent by a channel feedback station, where the N segment frames are filled with M to be fed back Channel information of the carrier group, the channel information of the M subcarrier groups to be fed back is cross-filled into the N segment frames, the M is an integer greater than 1, and the N is greater than or equal to An integer of 1 , the subcarrier group includes one or more subcarriers; and acquiring channel information of the M subcarrier groups to be fed back filled in the N segment frames.
  • acquiring the channel information of the M sub-carrier groups to be fed back filled in the N segment frames includes: determining a segment frame that is correctly received; and filling the segment frame with the correctly received segment
  • the channel information of the subcarrier group determines channel information of the M subcarrier groups to be fed back.
  • the channel information of the M subcarrier groups to be fed back includes: estimating, by using a subcarrier group adjacent to the subcarrier group corresponding to the segment frame that is not correctly received, the subcarrier group corresponding to the segment frame that is not correctly received.
  • the subcarrier group corresponding to the segment frame that is not correctly received is a subcarrier group corresponding to channel information of the subcarrier group filled in the segment frame that is not correctly received, the adjacent The subcarrier group is a subcarrier group corresponding to channel information of the subcarrier group filled in the segment frame that is correctly received; according to the estimated channel information of the subcarrier group filled in the incorrectly received segment frame and the The channel information of the subcarrier groups filled in the correctly received segmented frame determines the channel information of the M subcarrier groups to be fed back.
  • the weight and correct reception of channel information of the subcarrier group filled in the correctly received segment frame used
  • the subcarrier group number is inversely proportional to the distance of the subcarrier group number that is not correctly received, wherein the correctly received subcarrier group number is the subcarrier group filled in the used segment frame that is correctly received.
  • the number of the subcarrier group corresponding to the channel information, the subcarrier group number that is not correctly received is the number of the subcarrier group corresponding to the channel information of the subcarrier group filled in the segment frame that is not correctly received.
  • the method further includes: when the number of correctly received segmented frames is less than or equal to a threshold, sending, to the channel feedback site, the channel for requesting The feedback site retransmits the channel report polling frame of the segmented frame that was not correctly received.
  • the method before receiving the N segment frames sent by the channel feedback site, the method further includes: sending, to the channel feedback site, a sounding signal for detecting channel information of the subcarrier group to be fed back, where The sounding signal is used by the channel feedback station to acquire channel information of L subcarrier groups, the L being an integer greater than 1, and the L is greater than or equal to the M.
  • the method before receiving the N segment frames sent by the channel feedback site, the method further includes: sending an indication message indicating the value of the N and/or the M to the channel feedback site.
  • the indication message used to indicate the value of the M includes the bandwidth of the required channel information and indication information of the frequency band.
  • the channel information of the subcarrier group includes at least one of: channel information of one subcarrier in the subcarrier group; channel information of multiple subcarriers in the subcarrier group; in the subcarrier group Channel information synthesized by channel information of a plurality of subcarriers.
  • each of the N segment frames includes at least one of the following information: segment number information, indication information indicating whether the segment is a start segment, and channel data dimension indication information. Segment number information, measured bandwidth information, channel signal to noise ratio information, and packet information.
  • a channel information sending method including: cross-filling channel information of M subcarrier groups to be fed back into N segment frames, where M is greater than An integer of 1, the N is an integer greater than or equal to 1, the subcarrier group includes one or more subcarriers; and the N segmented frames are transmitted to a channel sounding station.
  • the method further includes: receiving, by the channel sounding station, the subcarrier group for detecting the to be fed back a sounding signal of the channel information; acquiring channel information of the L subcarrier groups according to the sounding signal, wherein the L is an integer greater than 1, and the L is greater than or equal to the M.
  • the method further includes: receiving, by the channel sounding station, the M and/or the An indication message of the value of N.
  • the indication message used to indicate the value of the M includes the bandwidth of the required channel information and indication information of the frequency band.
  • the channel information of the subcarrier group includes at least one of: channel information of one subcarrier in the subcarrier group; channel information of multiple subcarriers in the subcarrier group; in the subcarrier group Channel information synthesized by channel information of a plurality of subcarriers.
  • the length of the channel information of the subcarrier group filled in each of the N segment frames is less than or equal to the maximum data unit block length supported by the channel sounding station.
  • sending the N segment frames to the channel sounding station comprises: encapsulating the N segment frames into N media access control layer protocol data units MPDU; and synthesizing the N MPDUs into one Aggregating medium access control protocol data unit A-MPDU; transmitting the A-MPDU The station is probed to the channel.
  • each of the N segment frames includes at least one of the following information: segment number information, indication information indicating whether the segment is a start segment, and channel data dimension indication information. Segment number information, measured bandwidth information, channel signal to noise ratio information, and packet information.
  • a channel information acquiring apparatus including: a first receiving module, configured to receive N segment frames sent by a channel feedback station, where the N segment frames are common The channel information of the M subcarrier groups to be fed back is filled, and the channel information of the M subcarrier groups to be fed back is cross-filled into the N segment frames, where M is an integer greater than 1.
  • the N is an integer greater than or equal to 1, and the subcarrier group includes one or more subcarriers.
  • the first acquiring module is configured to acquire the M to be fed back filled in the N segment frames. Channel information of the subcarrier group.
  • the first obtaining module includes: a first determining unit, configured to determine a segment frame that is correctly received; and a second determining unit configured to use the subcarrier group that is filled in the correctly received segmented frame
  • the channel information determines channel information of the M subcarrier groups to be fed back.
  • the second determining unit is configured to: estimate a subcarrier group corresponding to the incorrectly received segment frame by using a subcarrier group adjacent to the subcarrier group corresponding to the segment frame that is not correctly received.
  • Channel information where the subcarrier group corresponding to the segment frame that is not correctly received is a subcarrier group corresponding to channel information of the subcarrier group filled in the segment frame that is not correctly received, the adjacent subcarrier
  • the carrier group is a subcarrier group corresponding to channel information of the subcarrier group filled in the segment frame that is correctly received; according to the estimated channel information of the subcarrier group filled in the incorrectly received segment frame and the correct Channel information of the subcarrier groups filled in the received segmented frame determines channel information of the M subcarrier groups to be fed back.
  • the weight and correct reception of channel information of the subcarrier group filled in the correctly received segment frame used
  • the subcarrier group number is inversely proportional to the distance of the subcarrier group number that is not correctly received, wherein the correctly received subcarrier group number is the subcarrier group filled in the used segment frame that is correctly received.
  • the number of the subcarrier group corresponding to the channel information, the subcarrier group number that is not correctly received is the number of the subcarrier group corresponding to the channel information of the subcarrier group filled in the segment frame that is not correctly received.
  • the apparatus further includes: a first sending unit, configured to send, when the number of the correctly received segmented frames is less than or equal to a threshold, to send the channel to request the channel
  • the feedback site retransmits the channel report polling frame of the segmented frame that was not correctly received.
  • the device further includes: a first sending module, configured to send, to the channel feedback station, a sounding signal for detecting channel information of the subcarrier group to be fed back, wherein the sounding signal is used for
  • the channel feedback station acquires channel information of L subcarrier groups, the L is an integer greater than 1, and the L is greater than or equal to the M.
  • the apparatus further includes: a second sending module, configured to send an indication message for indicating the value of the N and/or the M to the channel feedback site.
  • a second sending module configured to send an indication message for indicating the value of the N and/or the M to the channel feedback site.
  • the indication message used to indicate the value of the M includes the bandwidth of the required channel information and indication information of the frequency band.
  • the channel information of the subcarrier group includes at least one of: channel information of one subcarrier in the subcarrier group; channel information of multiple subcarriers in the subcarrier group; in the subcarrier group Channel information synthesized by channel information of a plurality of subcarriers.
  • each of the N segment frames includes at least one of the following information: segment number information, indication information indicating whether the segment is a start segment, and channel data dimension indication information. Segment number information, measured bandwidth information, channel signal to noise ratio information, and packet information.
  • a channel information transmitting apparatus including: a filling module, configured to cross-fill channel information of M subcarrier groups to be fed back into N segment frames, where The M is an integer greater than 1, the N is an integer greater than or equal to 1, the subcarrier group includes one or more subcarriers, and the third sending module is configured to send the N segment frames to Channel detection site.
  • the device further includes: a second receiving module, configured to receive a sounding signal sent by the channel detecting station for detecting channel information of the subcarrier group to be fed back; and a second acquiring module, configured to Acquiring channel information of L subcarrier groups according to the sounding signal, wherein the L is an integer greater than 1, and the L is greater than or equal to the M.
  • a second receiving module configured to receive a sounding signal sent by the channel detecting station for detecting channel information of the subcarrier group to be fed back
  • a second acquiring module configured to Acquiring channel information of L subcarrier groups according to the sounding signal, wherein the L is an integer greater than 1, and the L is greater than or equal to the M.
  • the device further includes: a third receiving module, configured to receive an indication message sent by the channel sounding station to indicate the value of the M and/or the N.
  • a third receiving module configured to receive an indication message sent by the channel sounding station to indicate the value of the M and/or the N.
  • the indication message used to indicate the value of the M includes the bandwidth of the required channel information and indication information of the frequency band.
  • the channel information of the subcarrier group includes at least one of: channel information of one subcarrier in the subcarrier group; channel information of multiple subcarriers in the subcarrier group; in the subcarrier group Channel information synthesized by channel information of a plurality of subcarriers.
  • the length of the channel information of the subcarrier group filled in each of the N segment frames is less than or equal to the maximum data unit block length supported by the channel sounding station.
  • the third sending module includes: an encapsulating unit, configured to encapsulate the N segment frames into N media access control layer protocol data units MPDU; and an aggregation unit, configured to set the N MPDUs
  • the aggregation is an aggregation medium access control protocol data unit A-MPDU; and the second sending unit is configured to send the A-MPDU to the channel detection station.
  • each of the N segment frames includes at least one of the following information: segment number information, indication information indicating whether the segment is a start segment, and channel data dimension indication information. Segment number information, measured bandwidth information, channel signal to noise ratio information, and packet information.
  • the N segmented frames sent by the receiving channel feedback station are used, wherein the N segmented frames are filled with channel information of the M subcarrier groups to be fed back, and the M to be fed back
  • the channel information of the subcarrier group is cross-filled into the N segment frames, the M is an integer greater than 1, and the N is an integer greater than or equal to 1, and the subcarrier group includes one or Multiple subcarriers; acquiring channel information of the M subcarrier groups to be fed back filled in the N segment frames, which can reduce the overhead of network retransmission segments.
  • FIG. 1 is a schematic diagram of a WLAN basic service set in the related art
  • FIG. 2 is a schematic diagram of a probe report transmission in the related art
  • FIG. 3 is a flowchart of a method for acquiring channel information according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a channel information transmitting method according to an embodiment of the present invention.
  • FIG. 5 is a structural block diagram of a channel information acquiring apparatus according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a first obtaining module 54 in a channel information acquiring apparatus according to an embodiment of the present invention
  • FIG. 7 is a block diagram showing an optional structure of the first obtaining module 54 in the channel information acquiring apparatus according to an embodiment of the present invention.
  • FIG. 8 is a block diagram 1 of an optional structure of a channel information acquiring apparatus according to an embodiment of the present invention.
  • FIG. 9 is a block diagram 2 of an optional structure of a channel information acquiring apparatus according to an embodiment of the present invention.
  • FIG. 10 is a block diagram showing the structure of a channel information transmitting apparatus according to an embodiment of the present invention.
  • FIG. 11 is a block diagram 1 of an optional structure of a channel information transmitting apparatus according to an embodiment of the present invention.
  • FIG. 12 is a block diagram 2 of an optional structure of a channel information transmitting apparatus according to an embodiment of the present invention.
  • FIG. 13 is a block diagram showing an optional structure of a third transmitting module 104 in a channel information transmitting apparatus according to an embodiment of the present invention
  • FIG. 14 is a schematic diagram of a cross-selected subcarrier filling segment frame according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a channel information acquisition method according to an embodiment of the present invention. The method is applied to a channel detection site. As shown in FIG. 3, the process includes the following steps. :
  • Step S302 Receive N segment frames sent by the channel feedback station, where the N segment frames are filled with channel information of M subcarrier groups to be fed back, and M subcarrier groups to be fed back The channel information is cross-filled into N segment frames, the M is an integer greater than 1, N is an integer greater than or equal to 1, and the subcarrier group includes one or more subcarriers;
  • Step S304 acquiring channel information of the M subcarrier groups to be fed filled in the N segment frames.
  • the channel information of the subcarrier group filled in the received segment frame is cross-filled with the subcarrier group, and there are also multiple ways of cross-filling, which can be cross-filled according to the interval (ie, numbering).
  • Channels of subcarrier groups of 1, 3, 5, 7... are padded into a segmented frame
  • channels of subcarrier groups numbered 2, 4, 6, 8, ... are padded into a segmented frame
  • intervals for 2 cross-packets ie, the channels of the sub-carrier groups numbered 1, 4, 7, 10... are filled into one segment frame
  • the channels of the subcarrier groups numbered 3, 6, 9, 12, ... are padded into one segment frame, or other predetermined intervals are cross-filled.
  • the interval selected during cross-filling should satisfy certain conditions, for example, the interval should be related to the coherence bandwidth of the currently used wireless channel.
  • the so-called coherence bandwidth refers to a specific frequency range, and any two frequencies within the frequency range. The components are highly correlated. And, it can be determined that there is a predetermined connection between consecutive subcarrier groups, that is, the channel information of the adjacent subcarrier groups according to the subcarrier group to be estimated is capable of estimating the subcarrier to be estimated. Channel information.
  • segment frames reduce the overhead of network retransmission segments.
  • acquiring channel information of the M sub-carrier groups to be fed back filled in the N segment frames comprises: determining a correctly received segment frame; filling the segment frame with the correctly received segment The channel information of the subcarrier group determines channel information of the M subcarrier groups to be fed back.
  • the following method may be adopted: using the segment frame corresponding to the incorrectly received segment
  • the subcarrier group adjacent to the subcarrier group estimates the channel information of the subcarrier group corresponding to the segment frame that is not correctly received, where the subcarrier group corresponding to the segment frame that is not correctly received is the incorrect reception.
  • the subcarrier group corresponding to the channel information of the subcarrier group filled in the segmented frame, and the adjacent subcarrier group is the subcarrier group corresponding to the channel information of the subcarrier group filled in the segment frame that is correctly received;
  • Channel information of the subcarrier group filled in the segment frame that is not correctly received and correct The channel information of the subcarrier groups filled in the received segmented frame determines channel information of the M subcarrier groups to be fed back. Therefore, in this embodiment, channel information of the subcarrier group in the segment frame that is not correctly received is estimated by using subcarriers adjacent to the subcarrier group in the segment frame that is not correctly received. Therefore, it is not necessary to retransmit the segmented frame that is not correctly received, which reduces the overhead of network retransmission segmentation.
  • the weight of the channel information of the subcarrier group filled in the correctly received segment frame is correctly received.
  • the subcarrier group number is inversely proportional to the distance of the subcarrier group number that is not correctly received, wherein the correctly received subcarrier group number is the channel information corresponding to the used subcarrier group filled in the correctly received segment frame.
  • the number of the subcarrier group, the subcarrier group number that is not correctly received is the number of the subcarrier group corresponding to the channel information of the subcarrier group filled in the segment frame that is not correctly received.
  • the method further includes: when the number of correctly received segmented frames is less than or equal to a threshold, sending, to the channel feedback site, requesting channel feedback The station retransmits the channel report polling frame of the segmented frame that was not correctly received.
  • the channel feedback site needs to be requested to retransmit the segment frame that is not correctly received, and when the channel feedback site is requested to retransmit the segment frame that is not correctly received, the channel feedback site may be requested to retransmit all the frames.
  • the segmented frame that is not correctly received may also request the channel feedback site to retransmit part of the fragmented frame that is not correctly received, and the number of requests may also be multiple times.
  • the correctly received segmented frame is found.
  • the channel feedback station may be requested to retransmit the segment frame that was not correctly received until the number of correctly received segment frames is greater than the threshold.
  • the method before receiving the N segment frames sent by the channel feedback site, the method further includes: sending, to the channel feedback site, a sounding signal for detecting channel information of the subcarrier group to be fed back, where The sounding signal is used by the channel feedback station to acquire channel information of L subcarrier groups, where L is an integer greater than 1, and L is greater than or equal to M.
  • the method before receiving the N segment frames sent by the channel feedback site, the method further includes: sending an indication message for indicating the value of N and/or M to the channel feedback site.
  • the values of N and/or M can also be determined by the channel feedback site itself or by other stations.
  • the indication message for indicating the value of M includes the bandwidth of the required channel information and the indication information of the frequency band.
  • the channel information of the subcarrier group includes at least one of: channel information of one subcarrier in the subcarrier group; channel information of multiple subcarriers in the subcarrier group; and multiple subcarrier groups Channel information synthesized by channel information of a carrier.
  • the subcarrier group may include only one subcarrier, or may include multiple subcarriers, when the subcarrier group includes multiple subcarriers,
  • One subcarrier in the carrier group may be any one of the subcarrier groups, or may be a subcarrier determined according to a predetermined rule.
  • each of the N segmented frames includes at least one of the following information: segment number information, indication information indicating whether the segment is a start segment, and a channel. Data dimension indication information, number of segments information, measured bandwidth information, channel signal to noise ratio information, grouping information. The above information included in the segment frame may be used to estimate channel information of subcarriers adjacent to the subcarrier group corresponding to the segment frame.
  • FIG. 4 is a flowchart of a method for transmitting channel information according to an embodiment of the present invention. The method is applied to a channel feedback site. As shown in FIG. 4, the process includes the following steps:
  • Step S402 the channel information of the M subcarrier groups to be fed back is cross-filled into N segment frames, where M is an integer greater than 1, and N is an integer greater than or equal to 1, and the subcarrier group includes one Or multiple subcarriers;
  • Step S404 the N segment frames are sent to the channel sounding station.
  • the cross-filling method is adopted, so that the subcarrier group can be sequentially filled into the segmented frame, and there are various ways of cross-filling.
  • the subcarrier group of the subcarrier group numbered 1, 3, 5, 7, ... is filled into a segment frame, and the subcarrier groups numbered 2, 4, 6, 8, ...
  • the channel is padded into a segmented frame, or the interval is 2 cross-packets (ie, the channels of the subcarrier groups numbered 1, 4, 7, 10... are filled into a segmented frame, numbered 2, 5,
  • the interval should satisfy certain conditions, for example, the interval should be related to the coherence bandwidth of the currently used wireless channel.
  • the so-called coherence bandwidth refers to a specific frequency range, and any two frequency components in the frequency range have strong Correlation.
  • there is a predetermined connection between the consecutive subcarrier groups that is, the channel information of the adjacent subcarrier groups according to the subcarrier group to be estimated is the channel information of the subcarrier to be estimated.
  • the channel sounding station receives the segmented frame, even if all the segmented frames are not correctly received, it is possible to estimate the segmented frame that is not correctly received according to the correctly received segmented frame, without the channel
  • the feedback site retransmits the segmented frames that are not correctly received, which reduces the overhead of network retransmission segments.
  • the method before the channel information of the M subcarrier groups to be fed back is cross-filled into the N segment frames, the method further includes: receiving, by the channel sounding station, the sub-sent for detecting the to-be-feedback a sounding signal of the channel information of the carrier group; acquiring channel information of the L subcarrier groups according to the sounding signal, wherein the L is an integer greater than 1, and L is greater than or equal to M.
  • the method before the channel information of the M subcarrier groups to be fed back is cross-filled into the N segment frames, the method further includes: receiving, by the channel sounding station, the indication M and/or N The indication of the value.
  • the indication message for indicating the value of the M includes the bandwidth of the required channel information and the indication information of the frequency band.
  • the channel information of the foregoing subcarrier group includes at least one of: channel information of one subcarrier in the subcarrier group; channel information of multiple subcarriers in the subcarrier group; and channel information information of multiple subcarriers in the subcarrier group. Synthesized channel information.
  • the subcarrier group may include only one subcarrier, or may include multiple subcarriers, when the subcarrier group includes multiple subcarriers,
  • One subcarrier in the carrier group may be any one of the subcarrier groups, or may be a subcarrier determined according to a predetermined rule.
  • the length of the channel information of the subcarrier group filled in each of the N segment frames is less than or equal to the maximum data unit block length supported by the channel sounding station.
  • sending the N segment frames to the channel sounding station comprises: encapsulating the N segment frames into N media access control layer protocol data units MPDU; and synthesizing the N MPDUs into one Aggregating the medium access control protocol data unit A-MPDU; transmitting the A-MPDU to the channel sounding station.
  • each of the N segmented frames includes at least one of the following information: segment number information, indication information indicating whether the segment is a start segment, channel data dimension indication information, Segment number information, measured bandwidth information, channel signal to noise ratio information, grouping information.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
  • a computer storage medium having stored therein computer executable instructions for performing the above method.
  • a channel information obtaining apparatus is further provided, which is used to implement the foregoing embodiments and optional implementation manners, and has not been described again.
  • 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. 5 is a structural block diagram of a channel information acquiring apparatus according to an embodiment of the present invention. As shown in FIG. 5, the apparatus includes a first receiving module 52 and a first acquiring module 54, which are described below.
  • the first receiving module 52 is configured to receive the N segmented frames sent by the channel feedback station, where the N segment frames are filled with channel information of the M subcarrier groups to be fed back, and the M to be fed back
  • the channel information of the carrier group is cross-filled into N segment frames, and M is greater than 1.
  • the first obtaining module 54 is connected to the first receiving module 52, and is configured to acquire channel information of the M subcarrier groups to be fed back filled in the N segment frames.
  • FIG. 6 is a structural block diagram of a first obtaining module 54 in a channel information acquiring apparatus according to an embodiment of the present invention. As shown in FIG. 6, the first obtaining module 54 includes a first determining unit 62 and a second determining unit 64. The first acquisition module 54 will be described.
  • a first determining unit 62 configured to determine a segment frame that is correctly received
  • the second determining unit 64 is connected to the first determining unit 62, and is configured to determine channel information of the M subcarrier groups to be fed back by using channel information of the subcarrier group filled in the correctly received segmented frame.
  • the foregoing second determining unit 64 is configured to: estimate a subcarrier group corresponding to the incorrectly received segment frame by using a subcarrier group adjacent to the subcarrier group corresponding to the segment frame that is not correctly received.
  • Channel information where the subcarrier group corresponding to the segment frame that is not correctly received is a subcarrier group corresponding to channel information of the subcarrier group filled in the segment frame that is not correctly received, and the adjacent subcarrier group is The subcarrier group corresponding to the channel information of the subcarrier group filled in the segment frame that is correctly received; the channel information of the subcarrier group filled in the estimated segment frame that is not correctly received and the correctly received segment frame padding
  • the channel information of the subcarrier group determines the channel information of the M subcarrier groups to be fed back.
  • the weight of the channel information of the subcarrier group filled in the correctly received segment frame is used and the correctly received subcarrier
  • the carrier group number is inversely proportional to the distance of the subcarrier group number that is not correctly received, wherein the correctly received subcarrier group number is corresponding to the channel information of the subcarrier group filled in the correctly received segment frame used.
  • the number of the subcarrier group, the subcarrier group number that is not correctly received is the number of the subcarrier group corresponding to the channel information of the subcarrier group filled in the segment frame that is not correctly received.
  • FIG. 7 is a block diagram showing an optional structure of the first obtaining module 54 in the channel information acquiring apparatus according to the embodiment of the present invention.
  • the first acquiring module 54 includes all the units shown in FIG.
  • the first sending unit 72 describes the first acquiring module 54 below.
  • the first sending unit 72 is connected to the first determining unit 62, and is set to be correctly received.
  • the channel feedback station transmits a channel report poll frame for requesting the channel feedback site to retransmit the segment frame that was not correctly received.
  • FIG. 8 is a block diagram of an optional structure of a channel information acquiring apparatus according to an embodiment of the present invention. As shown in FIG. 8, the apparatus includes a first sending module 82 in addition to all the modules shown in FIG. The device is described.
  • the first sending module 82 is connected to the first receiving module 52, and is configured to send, to the channel feedback station, a sounding signal for detecting channel information of the subcarrier group to be fed back, wherein the sounding signal is used for channel feedback site acquisition.
  • Channel information of subcarrier groups, L is an integer greater than 1, and L is greater than or equal to M.
  • FIG. 9 is a second block diagram of an optional structure of a channel information acquiring apparatus according to an embodiment of the present invention. As shown in FIG. 9, the apparatus includes a second sending module 92 in addition to all the modules shown in FIG. The device is described.
  • the second sending module 92 is connected to the first receiving module 52, and is configured to send an indication message for indicating the value of N and/or M to the channel feedback site.
  • the indication message for indicating the value of the M includes the bandwidth of the required channel information and the indication information of the frequency band.
  • the channel information of the foregoing subcarrier group includes at least one of: channel information of one subcarrier in the subcarrier group; channel information of multiple subcarriers in the subcarrier group; and channel information information of multiple subcarriers in the subcarrier group. Synthesized channel information.
  • each of the N segmented frames includes at least one of the following information: segment number information, indication information indicating whether the segment is a start segment, channel data dimension indication information, Segment number information, measured bandwidth information, channel signal to noise ratio information, grouping information.
  • FIG. 10 is a structural block diagram of a channel information transmitting apparatus according to an embodiment of the present invention. As shown in FIG. 10, the apparatus includes a filling module 102 and a third transmitting module 104, which will be described below.
  • the filling module 102 is configured to cross-fill channel information of the M subcarrier groups to be fed back into the N segment frames, where M is an integer greater than 1, and N is an integer greater than or equal to 1, the subcarrier group Include one or more subcarriers;
  • the third sending module 104 is connected to the filling module 102, and is configured to send N segment frames. Send to the channel detection site.
  • FIG. 11 is a block diagram of an optional structure of a channel information transmitting apparatus according to an embodiment of the present invention. As shown in FIG. 11, the apparatus includes a second receiving module 112 and a second acquiring, in addition to all the modules shown in FIG. Module 114, the device will be described below.
  • the second receiving module 112 is configured to receive a sounding signal sent by the channel sounding station for detecting channel information of the subcarrier group to be fed back;
  • the second obtaining module 114 is connected to the second receiving module 112 and the filling module 102, and is configured to acquire channel information of L subcarrier groups according to the sounding signal, wherein the L is an integer greater than 1, and L is greater than or equal to M.
  • FIG. 12 is a block diagram showing an optional structure of a channel information transmitting apparatus according to an embodiment of the present invention. As shown in FIG. 12, the apparatus includes a third receiving module 122 in addition to all the modules shown in FIG. The device is described.
  • the third receiving module 122 is connected to the filling module 102, and is configured to receive an indication message sent by the channel detecting station for indicating the value of M and/or N.
  • the indication message for indicating the value of the M includes the bandwidth of the required channel information and the indication information of the frequency band.
  • the channel information of the foregoing subcarrier group includes at least one of: channel information of one subcarrier in the subcarrier group; channel information of multiple subcarriers in the subcarrier group; and channel information information of multiple subcarriers in the subcarrier group. Synthesized channel information.
  • the length of the channel information of the subcarrier group filled in each of the N segment frames is less than or equal to the maximum data unit block length supported by the channel sounding station.
  • the filling module 102 is configured to: fill channel information of the ith subcarrier group of the M subcarrier groups to be fed into the (i mod N)+1 points in the N segment frames.
  • FIG. 13 is a block diagram showing an optional structure of a third transmitting module 104 in a channel information transmitting apparatus according to an embodiment of the present invention.
  • the third transmitting module 104 includes an encapsulating unit 132, an aggregating unit 134, and a second transmitting unit. 136.
  • the third transmitting module 104 will be described below.
  • Encapsulation unit 132 configured to encapsulate N segment frames into N media access control layer protocol numbers According to the unit MPDU;
  • the aggregation unit 134 is connected to the foregoing encapsulation unit 132, and is configured to aggregate N MPDUs into one aggregate medium access control protocol data unit A-MPDU;
  • the second sending unit 136 is connected to the foregoing aggregating unit 134 and configured to send the A-MPDU to the channel detecting station.
  • each of the N segmented frames includes at least one of the following information: segment number information, indication information indicating whether the segment is a start segment, channel data dimension indication information, Segment number information, measured bandwidth information, channel signal to noise ratio information, grouping information.
  • a new segment (same segment segment) transmission method is designed in the embodiment of the present invention, and all channel information can be obtained under the condition that part of the segment is lost and no retransmission is performed. Reduce the overhead of network retransmission segmentation and further improve network efficiency.
  • the STA1 wants to send data to its associated access station AP. In order to obtain a more reliable transmission, STA1 performs a channel measurement process. At this time, STA1 is the channel probe and the AP is the channel feedback.
  • the specific process is as follows:
  • STA1 sends a channel sounding notification frame, informs the AP to perform channel measurement, and transmits a sounding signal NDP after the notification frame.
  • the AP receives the notification frame and detects the subsequent NDP, measures the estimated channel state, and generates a measurement report.
  • the antenna configuration is 4 ⁇ 4
  • the feedback report length of each subcarrier is 60 bits (the low precision is 36 bits). Since the feedback measurement report is larger than 7020 Bytes, which exceeds the maximum MPDU length supported by the station (assumed to be 3895 Bytes), the feedback party segments the feedback report.
  • the number of segments N is guaranteed The integer, that is, N ⁇ 2, the value of N can take the minimum value through a predefined rule, or the maximum value possible. For example, the maximum number of segments supported by the protocol pre-defined is 8, then the default score can be assumed. The number of segments is taken as 8, and in this embodiment, N is assumed to be a minimum value of 2.
  • the AP cross-selects the channel information of the sub-carriers to be fed back into the determined two feedback report segment frames, and aggregates the report segment frames into the channel probes.
  • the sub-carrier group can be considered to contain only one sub-carrier. The price is moderate in this implementation. specific:
  • FIG. 14 is a schematic diagram of a cross-selection subcarrier filling segment frame according to an embodiment of the present invention.
  • the MPDUs in which the two segment frames are located are aggregated into one A-MPDU and sent to STA1 in one radio frame.
  • STA1 receives the above-mentioned radio frame including a plurality of segments of feedback information, and assumes that only segment 1 is received correctly, and segment 2 is subject to interference error.
  • STA1 reports the total number of segments indicated in the segmentation frame 1 according to the feedback report, the dimension of the channel information fed back (related to the antenna configuration), the accuracy of the feedback, the sequence number of the segment, and the like, and knows that the 0, 2, and 4 are correctly received. Across 934 subcarrier feedback, the other has an error.
  • the coherent bandwidth characteristics of the channel it is considered that there is a strong correlation between adjacent subcarriers, and STA1 estimates the entire channel according to the segmentation frame that receives the correct feedback report.
  • the channel information estimator according to subcarriers 0 and 2 is used.
  • the carrier 1 information is estimated based on the information of 2 and 4 subcarriers, and so on.
  • the interval between subcarriers 0 and 2 and subcarrier No. 1 is the same, and the weights are the same when estimated.
  • the algorithm used can be a variety of linear interpolation or nonlinear interpolation algorithms that have been used so far.
  • STA1 does not need to send a feedback report polling frame to the AP, and requires the AP to retransmit the feedback report segment frame 2, which saves transmission overhead.
  • the AP wants to send data to its associated STA1 and STA2. In order to obtain a more reliable transmission, the AP performs a channel measurement process. At this time, the AP is a channel probe, and STA1 and STA2 are channel feedback parties.
  • the process includes:
  • the AP sends a channel sounding notification frame, including the identifiers of STA1 and STA2 and its measurement parameters, informing STA1 and STA2 to perform channel measurement, and transmitting a sounding signal NDP after the notification frame, and STA1 and STA2 receive the notification frame and detect the subsequent NDP measures the estimated channel state and generates a measurement report.
  • STA1 and STA2 sequentially feed back the channel measurement report. It is assumed that STA1 feeds back immediately after NDP, and STA2 waits for feedback from the AP after receiving it.
  • the carrier, DC subcarrier, etc. do not require a feedback measurement report.
  • the antenna configuration is 4 ⁇ 4
  • the feedback report length of each subcarrier is 60 bits (the low precision is 36 bits). Since the feedback measurement report is larger than 7020 Bytes, which exceeds the maximum MPDU length supported by the site (assumed to be 3895 Bytes), the feedback party needs to segment the feedback report. And the number of segments N is guaranteed The integer, that is, N ⁇ 2.
  • the AP may specify or recommend the values of M and N to the station.
  • the packet feeds back information of one subcarrier for example, 0 and 1 are a group, only feedback information of subcarrier No. 1 is received, no feedback of No. 0, and so on, and the number of subcarrier channel information to be fed back is 1, 3, ..., 935.
  • the STA1 cross-selects the channel information of the 468 subcarriers to be fed back into the determined two feedback report segment frames, and aggregates the report segment frames and sends them to the channel probes. include:
  • Each subcarrier group only feeds back the channel information of one subcarrier, and specifically corresponds to the original subcarrier number.
  • the information of the first, fifth, ninth, ..., 933 subcarriers is put into the first segment, and the remaining Put in the second segmented frame.
  • Each segmented frame indicates its own segment number, the total number of segments, and STA1 will report the total subcarriers of the report and select a feedback situation.
  • the MPDUs in which the two segment frames are located are aggregated into one A-MPDU and sent to the AP in one radio frame.
  • STA2 waits for the polling report of the AP to send a probe report. Similar to STA1, the 936 subcarriers are selected in the four feedback report segment frames and aggregated and sent to the AP.
  • the AP receives the radio frame that is sent by the foregoing STA1 and includes multiple feedback report segment frames, assuming that all are correct.
  • the AP sends a polling frame to request STA2 to report the report and receive multiple feedback report segment frames sent by STA2. It is assumed that only the segment 2 frames of the four segment frames are correctly received, and other errors occur. According to the coherent bandwidth characteristics of the channel, the AP considers that there are too many missing segments. According to the channel coherence characteristics, the error of all feedback reports is larger than the preset threshold T (assuming T is at least half of the subcarriers), then the AP Continue to poll STA2 to resend the erroneous segmentation frame. If STA2 resends the segmentation frames 1, 3, and 4, and the AP receives two of the segments 1 and 4, the AP considers that the missing segment can be estimated. Then, the AP acquires the channel information of all the subcarriers by using the segmented frame 1, 2, and 4, instead of requiring the STA2 to continue to retransmit the segment 3.
  • the channel sounding party and the channel feedback party can flexibly select the values of M and N as long as the basic segment size and number are not exceeded, and the channel sounding party can indicate or suggest the amount of data fed back by the channel feedback party.
  • the channel sounding party can judge whether it is necessary to retransmit the erroneous segment according to the number of received segmented frames, and balance the channel estimation accuracy and feedback overhead.
  • the AP wants to send data to its associated STA1.
  • the AP performs the channel measurement process.
  • the AP is the channel probe and the STA1 is the channel feedback.
  • the specific process is as follows:
  • the AP sends a channel sounding notification frame, informing STA1 to perform channel measurement, and transmitting a sounding signal NDP after the notification frame.
  • STA1 receives the notification frame and detects the subsequent NDP, measures the estimated channel state, and generates a measurement report.
  • the carrier, DC subcarrier, etc. do not require a feedback measurement report.
  • the antenna configuration is 4 ⁇ 4
  • the feedback report length of each subcarrier is 60 bits (the low precision is 36 bits).
  • the STA1 cross-selects the channel information of the 468 subcarrier group to be fed back to the determined four inverses.
  • the report segment frame is aggregated and sent to the channel prober. specific:
  • the channel information of each data subcarrier group contains channel information of two subcarriers.
  • Each segmented frame indicates its own segment number, the total number of segments, and STA1 will report the total subcarriers of the report and select a feedback situation.
  • the MPDUs in which the four segment frames are located are aggregated into one A-MPDU and sent to the AP in one radio frame.
  • the AP receives the radio frame that is sent by the foregoing STA1 and includes multiple feedback report segment frames, and selects to trigger the STA1 retransmission according to the received correct number of segmented frames or acquires all channel information according to the received segmented frame.
  • the AP wants to send data to its associated STA1.
  • the AP performs a channel measurement process.
  • the AP is the channel probe and STA1 is the channel feedback.
  • the process includes:
  • the AP sends a channel sounding notification frame, informing STA1 to perform channel measurement, and transmitting a sounding signal NDP after the notification frame.
  • STA1 receives the notification frame and detects the subsequent NDP, measures the estimated channel state, and generates a measurement report.
  • the feedback party needs to segment the feedback report to ensure that the transmission quality avoids all errors.
  • the STA1 cross-selects the channel information of the 468 subcarrier group to be fed back into the determined four feedback report segment frames, and aggregates the report segment frames and sends them to the channel probe party.
  • the channel information to be fed back is the average of the channel information of the two subcarriers in the group.
  • Each segmented frame indicates its own segment number, the total number of segments, and STA1 will report the total subcarriers of the report and select a feedback situation.
  • the MPDUs in which the four segment frames are located are aggregated into one A-MPDU and sent to the AP in one radio frame.
  • the AP receives the radio frame that is sent by the foregoing STA1 and includes multiple feedback report segment frames, and selects to trigger the STA1 retransmission according to the received correct number of segmented frames or acquires all channel information according to the received segmented frame.
  • the values of M and N may be specified or suggested, and the bandwidth or frequency band of the channel information of the M subcarrier groups may be additionally indicated.
  • the AP requires STA1 and STA2 to perform channel sounding. It is assumed that the bandwidth to be detected by the AP is 80 MHz. However, the AP does not want STA1 and STA2 to feed back 80 MHz channel information.
  • the AP sends a channel sounding notification frame or other information to STA1/1.
  • the STA2 frame indicates that STA1 only feeds back the upper 40 MHz channel information in the 80 MHz channel, and STA2 only feeds back the 40 MHz channel information. That is, the AP sends the 80 MHz measurement signal NDP, but indicates that the bandwidth of the channel feedback side to be fed back can be smaller than 80 MHz, which allows the channel feedback party to only feed back the channel detection report of part of the bandwidth or frequency band.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the storage medium is further arranged to store program code for performing the following steps:
  • the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM).
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • the entire channel sounding report can be obtained without retransmission in the case of some segment loss, thereby reducing the overhead of the channel feedback process and improving Network efficiency.
  • 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 above technical solution can reduce the overhead of network retransmission segmentation.

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Abstract

L'invention concerne un procédé d'acquisition, un procédé d'envoi, un dispositif d'acquisition et un dispositif d'envoi d'informations de canal, le procédé d'acquisition d'informations de canal consistant à : recevoir un nombre N de trames segmentées envoyé à partir d'une station de rétroaction de canal, un nombre N de trames segmentées étant rempli d'informations de canal d'un nombre M de groupes de sous-porteuses devant être renvoyé qui est rempli transversalement en un nombre N de trames segmentées, M étant un nombre entier supérieur à 1, N étant un nombre entier supérieur ou égal à 1, et les groupes de sous-porteuses comprenant une ou plusieurs sous-porteuses ; acquérir les informations de canal d'un nombre M de groupes de sous-porteuses devant être renvoyé dans un nombre N de trames segmentées, les informations de canal étant remplies d'informations de canal d'un nombre M de groupes de sous-porteuses devant être renvoyé. La solution technique permet de réduire le coût de segments de retransmission du réseau.
PCT/CN2016/081904 2015-06-05 2016-05-12 Procédé d'acquisition, procédé d'envoi, dispositif d'acquisition et dispositif d'envoi d'informations de canal WO2016192520A1 (fr)

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