WO2016138778A1 - Procédé et dispositif de transmission d'informations d'état de canal - Google Patents

Procédé et dispositif de transmission d'informations d'état de canal Download PDF

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Publication number
WO2016138778A1
WO2016138778A1 PCT/CN2015/095619 CN2015095619W WO2016138778A1 WO 2016138778 A1 WO2016138778 A1 WO 2016138778A1 CN 2015095619 W CN2015095619 W CN 2015095619W WO 2016138778 A1 WO2016138778 A1 WO 2016138778A1
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Prior art keywords
target
sta
information
channel state
same
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PCT/CN2015/095619
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English (en)
Chinese (zh)
Inventor
杨讯
于健
刘乐
张佳胤
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华为技术有限公司
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Publication of WO2016138778A1 publication Critical patent/WO2016138778A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals

Definitions

  • the present invention relates to the field of communications and, more particularly, to a method and apparatus for transmitting channel state information.
  • MU-MIMO multiuser multiple input
  • MU-MIMO implements a parallel channel by using a spatial dimension and provides it to multiple users as a transmission method.
  • this method requires all or part of the channel state information of the transmitting end or the receiving end, otherwise the receiving end cannot correctly demodulate the multi-channel valid signal, resulting in transmission failure.
  • NDPA Null Data Packet Announcement
  • NDP null data packet
  • STA Station
  • HE-LTF high efficient long training filed
  • each STA performs feedback in different time periods, or in a frame corresponding to different time periods. Therefore, the AP needs to receive and acquire channel state information fed back by the STAs indicated in the NDPA one by one.
  • the transmission load and power consumption of the AP are increased, the transmission efficiency is reduced, and the overall transmission processing time of the communication system is prolonged, which seriously affects the user experience.
  • the embodiment of the invention provides a method and a device for transmitting channel state information, which can reduce the transmission overhead of the AP receiving channel state information fed back by each STA, improve transmission efficiency, and improve the user body. Test.
  • the first aspect provides a method for transmitting channel state information, where the method includes: the access point AP sends feedback indication information, resource scheduling information, and a high-efficiency long training sequence, where the feedback indication information is used to indicate that a channel needs to be fed back to the AP.
  • the resource scheduling information is used to indicate communication resources used when each of the target STAs feeds back channel state information, where the time domain resources corresponding to the communication resources used by each target STA are the same
  • the frequency domain resources corresponding to the communication resources used by the target STAs are different, or the spatial resources corresponding to the communication resources used by the target STAs are different, and the high-efficiency long training sequence is used by each target STA.
  • Channel estimation processing for determining channel state information; receiving, by the communication resource, channel state information fed back by each of the target STAs.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each target STA correspond to different time-frequency resource blocks in the same frame.
  • the resource scheduling information is further used to indicate a communication resource used by at least one non-target STA to transmit uplink data to the AP, where
  • the time domain resource corresponding to the communication resource used by the target STA and the non-target STA is the same, the frequency domain resource corresponding to the communication resource used by the target STA and the non-target STA is different, or the target STA and the non-target The airspace resources corresponding to the communication resources used by the target STA are different.
  • the second aspect provides a method for transmitting channel state information, where the method includes: the station STA receives the access point AP, sends feedback indication information, resource scheduling information, and a high-efficiency long training sequence, where the feedback indication information is used to indicate that the The AP feeds back at least two target station STAs of the channel state information, where the resource scheduling information is used to indicate communication resources used when each of the target STAs feeds back channel state information, where each communication resource used by the target STA corresponds to a communication resource.
  • the domain resources are the same, the frequency domain resources corresponding to the communication resources used by the target STAs are different, or the airspace resources corresponding to the communication resources used by the target STAs are different, and the high-efficiency long training sequence is used for each target STA.
  • Performing channel estimation processing for determining channel state information if it is determined according to the feedback indication information that the station belongs to the station, performing channel estimation according to the high-efficiency long training sequence to determine channel feedback information, and according to the resource scheduling information,
  • the communication resource feeds back the channel state information to the AP.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each target STA correspond to different time-frequency resource blocks in the same frame.
  • the resource scheduling information is further used to indicate a communication resource used by the at least one non-target STA to transmit uplink data to the AP, where
  • the time domain resource corresponding to the communication resource used by the target STA and the non-target STA is the same, the frequency domain resource corresponding to the communication resource used by the target STA and the non-target STA is different, or the target STA and the non-target
  • the air resource corresponding to the communication resource used by the target STA is different
  • the method further includes: if it is determined to belong to the non-target STA according to the feedback indication information, transmitting, by using the communication resource, the uplink to the AP according to the resource scheduling information data.
  • the third aspect provides an apparatus for transmitting channel state information
  • the apparatus includes: a sending unit, configured to send feedback indication information, resource scheduling information, and a high-efficiency long training sequence, where the feedback indication information is used to indicate that the AP needs to be fed back to the AP.
  • the resource scheduling information is used to indicate a communication resource used by each of the target STAs to feed back channel state information, where the time domain resources corresponding to the communication resources used by each target STA are used.
  • the frequency domain resources corresponding to the communication resources used by the target STAs are different, or the spatial resources corresponding to the communication resources used by the target STAs are different, and the high-efficiency long training sequence is used by each target STA.
  • a receiving unit configured to receive, by using the communication resource, channel state information fed back by each target STA.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each target STA correspond to different time-frequency resource blocks in the same frame.
  • the resource scheduling information is further used to indicate a communication resource used by the at least one non-target STA to transmit uplink data to the AP, where
  • the time domain resource corresponding to the communication resource used by the target STA and the non-target STA is the same, the frequency domain resource corresponding to the communication resource used by the target STA and the non-target STA is different, or the target STA and the non-target The airspace resources corresponding to the communication resources used by the target STA are different.
  • the fourth aspect provides an apparatus for transmitting channel state information
  • the apparatus includes: a receiving unit, configured to receive, by the access point AP, feedback indication information, resource scheduling information, and a high-efficiency long training sequence, where the feedback indication information is used to indicate At least two target station STAs that need to feed back channel state information to the AP, the resource scheduling information is used to indicate communication resources used when each of the target STAs feeds back channel state information, where the communication resources used by each target STA are used.
  • the corresponding time domain resources are the same, the frequency domain resources corresponding to the communication resources used by the target STAs are different, or the airspace resources corresponding to the communication resources used by the target STAs are different, and the high-efficiency long training sequence is used for each of the a channel estimation process performed by the target STA for determining channel state information; a processing unit, configured to perform channel estimation according to the high-efficiency long training sequence to determine channel feedback information if it is determined to belong to the station STA according to the feedback indication information, and According to the resource scheduling information, the control sending unit feeds back the channel state to the AP through the communication resource.
  • Information configured to perform channel estimation according to the high-efficiency long training sequence to determine channel feedback information if it is determined to belong to the station STA according to the feedback indication information, and According to the resource scheduling information, the control sending unit feeds back the channel state to the AP through the communication resource.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each target STA correspond to different time-frequency resource blocks in the same frame.
  • the resource scheduling information is further used to indicate a communication resource used by the at least one non-target STA to transmit uplink data to the AP, where
  • the time domain resource corresponding to the communication resource used by the target STA and the non-target STA is the same, the frequency domain resource corresponding to the communication resource used by the target STA and the non-target STA is different, or the target STA and the non-target
  • the air resource corresponding to the communication resource used by the target STA is different
  • the processing unit is further configured to: if the non-target STA is determined according to the feedback indication information, control, by the resource scheduling information, the sending unit to use the communication resource, The uplink data is transmitted to the AP.
  • the AP may send the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence, so that the feedback indication information indicates that the channel state information needs to be fed back to the AP.
  • at least two target STAs determine communication resources used when feeding back channel state information according to the resource scheduling information, and can perform channel estimation processing according to the high-efficiency long training sequence to determine channel state information that needs to be fed back to the AP, and
  • the time domain resources corresponding to the communication resources used by the target STAs are the same, and the frequency domain resource space resources corresponding to the communication resources used by the target STAs are different, so that each target STA can feed back the channel state to the AP in the same period.
  • Information therefore, the AP does not need to receive and acquire each item one by one.
  • the channel state information fed back by the STA can reduce the transmission overhead of the AP receiving the channel state information fed back by each STA, improve the transmission efficiency, and improve the user experience.
  • FIG. 1 is a schematic flowchart of a method for transmitting channel state information according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing an example of a frame structure of a frame used by an AP to transmit resource scheduling information and an efficient long training sequence.
  • FIG. 3 is a schematic diagram showing an example of a frame structure of a frame used by an AP to transmit resource scheduling information and feedback indication information.
  • FIG. 4 is a schematic diagram showing an example of a frame structure of a frame used by an AP to send feedback indication information, resource scheduling information, and feedback indication information.
  • FIG. 5 is a schematic diagram of another example of a frame structure of a frame used by an AP to send feedback indication information, resource scheduling information, and feedback indication information.
  • FIG. 6 is a schematic diagram of still another example of a frame structure of a frame used by an AP to send feedback indication information, resource scheduling information, and feedback indication information.
  • FIG. 7 is a schematic flowchart of a method of transmitting channel state information according to another embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of an apparatus for transmitting channel state information according to an embodiment of the present invention.
  • FIG. 9 is a schematic block diagram of an apparatus for transmitting channel state information according to another embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of an apparatus for transmitting channel state information according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of an apparatus for transmitting channel state information according to another embodiment of the present invention.
  • the technical solution of the present invention can be applied to various communication systems that need to feed back channel state information for data transmission, for example, a wireless local area network (WLAN) using MU-MIMO technology, for example, wireless fidelity (Wi -Fi, Wireless Fidelity), etc.
  • WLAN wireless local area network
  • MU-MIMO technology for example, wireless fidelity (Wi -Fi, Wireless Fidelity), etc.
  • a station may also be called a system, a subscriber unit, an access terminal, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent.
  • User equipment or UE User Equipment
  • the STA may be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), and a wireless local area network ( A handheld device such as a Wi-Fi) communication function, a computing device, or other processing device connected to a wireless modem.
  • an access point in the WLAN, can be used to communicate with the access terminal over the wireless local area network, and transmit data of the access terminal to the network side, or transmit data from the network side to the access side. Enter the terminal.
  • the term "article of manufacture” as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or media.
  • the computer readable medium may include, but is not limited to, a magnetic storage device (for example, a hard disk, a floppy disk, or a magnetic tape), and an optical disk (for example, a CD (Compact Disk), a DVD (Digital Versatile Disk). Etc.), smart cards and flash memory devices (eg, EPROM (Erasable Programmable Read-Only Memory), cards, sticks or key drivers, etc.).
  • various storage media described herein can represent one or more devices and/or other machine-readable media for storing information.
  • the term "machine-readable medium” may include, but is not limited to, a wireless channel and various other mediums capable of storing, containing, and/or carrying instructions and/or data.
  • FIG. 1 shows a schematic flow diagram of a method 100 of transmitting channel state information for an embodiment of the present invention as described from the perspective of an AP. As shown in FIG. 1, the method 100 includes:
  • the access point AP sends feedback indication information, resource scheduling information, and a high-efficiency long training sequence, where the feedback indication information is used to indicate at least two target station STAs that need to feed back channel state information to the AP, where the resource scheduling information is used to indicate a communication resource used by each of the target STAs to feed back channel state information, wherein the time domain resources corresponding to the communication resources used by the target STAs are the same, and the frequency domain resources corresponding to the communication resources used by the target STAs are different. Or the spatial resource corresponding to the communication resource used by each target STA is different, and the high-efficiency long training sequence is used for channel estimation processing performed by each target STA for determining channel state information;
  • the feedback indication information is used to indicate at least two target stations STA that need to feed back channel state information to the AP.
  • the feedback indication information may be a list in which the identity of the target STA is recorded, wherein the identity of one STA can uniquely indicate one STA.
  • a STA when a STA receives the list of the identifier of the target STA, if it determines that its identifier is recorded in the list, it can determine that it belongs to the target STA, and needs to feed back the channel state information to the AP.
  • the feedback indication information may be a mapping relationship between the target STAs and the corresponding channel state information related parameters that need to be fed back to the AP, where the identifier of one STA can uniquely indicate one STA.
  • the STA may search for related parameters of the channel state information corresponding to the identifier that need to be fed back to the AP based on the mapping relationship.
  • the content and form of the feedback indication information may be similar to the information carried in the NDPA (Null Data Packet Announcement) frame sent by the AP broadcast in the prior art, where In order to avoid redundancy, a detailed description thereof will be omitted.
  • NDPA Null Data Packet Announcement
  • the resource scheduling information is used to indicate a communication resource used when each of the target STAs feeds back channel state information. And, the communication resource is a communication resource belonging to the same time period.
  • the communication resource may be a frequency domain resource that corresponds to the same time period and does not interfere with each other (eg, orthogonal) in the frequency domain, and thus, for example, orthogonal frequency division may be adopted between the AP and the target STA.
  • Channel state information is transmitted in a manner such as OFDM (Orthogonal Frequency Division Multiplexing).
  • the communication resource may be an airspace resource that corresponds to the same time period and does not interfere with each other (eg, orthogonal) in the airspace.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resource may correspond to the same frame, or the same time period is a time period corresponding to one frame.
  • the communication resources used by each of the target STAs correspond to different time-frequency resource blocks in the same frame.
  • resource allocation may be performed in units of time-frequency resource blocks.
  • each target STA may use different time-frequency resource blocks in the same frame to feed back channel state information
  • the different time-frequency resource blocks may be time-frequency resource blocks corresponding to the same subframe and corresponding to different sub-carriers, or
  • the different time-frequency resource blocks may also be time-frequency resource blocks corresponding to the same sub-carrier and corresponding to different subframes.
  • the resource scheduling information is further used to indicate a communication resource used by the at least one non-target STA to transmit uplink data to the AP, where the target STA and the time domain corresponding to the communication resource used by the non-target STA
  • the resources are the same, and the frequency domain resources corresponding to the communication resources used by the target STA and the non-target STA are different, or the spatial resources corresponding to the communication resources used by the target STA and the non-target STA are different.
  • the resource scheduling information may be further used to perform resource scheduling on an STA (ie, a non-target STA) that does not need to feed back channel state information, so that the non-target STA may be in the resource scheduling information.
  • STA ie, a non-target STA
  • uplink data transmission eg, uplink OFDMA contention transmission
  • uplink OFDMA contention transmission is performed on the indicated communication resources.
  • the communication resource may be a frequency domain resource that corresponds to the same time period and does not interfere with each other (eg, orthogonal) in the frequency domain, so that the channel state may be transmitted between the AP and the non-target STA and the target STA by using, for example, OFDM. information.
  • OFDM orthogonal
  • the communication resource may be an airspace resource that corresponds to the same time period and does not interfere with each other (eg, orthogonal) in the airspace.
  • the communication resources used by the target STA and the non-target STA correspond to the same frame.
  • the communication resource may correspond to the same frame, or the same time period is a time period corresponding to one frame.
  • the communication resources used by the target STA and the non-target STA correspond to different time-frequency resource blocks in the same frame.
  • different time-frequency resource blocks in different frames in the same frame may be used to feed back channel state information between the non-target STAs and the target STAs, and the different time-frequency resource blocks may be corresponding to the same subframe and corresponding to different sub-carriers.
  • the frequency resource block, or the different time-frequency resource block may also be a time-frequency resource block corresponding to the same sub-carrier and corresponding to different subframes.
  • the resource scheduling information may be a mapping relationship between an identifier of an STA (which may include a target STA, and may include a target STA and a non-target STA) and each communication resource.
  • the identifier of one STA can uniquely indicate one STA.
  • the STA can search for communication resources corresponding to its identity based on the mapping relationship, and use the communication resources for information transmission (eg, transmission channel state information or uplink data).
  • information transmission eg, transmission channel state information or uplink data
  • the high-efficiency long training sequence is similar to the function, the generating method, and the using method of the long training sequence used for channel estimation in the prior art.
  • the high-efficiency long training sequence is similar to the function, the generating method, and the using method of the long training sequence used for channel estimation in the prior art.
  • detailed description thereof is omitted.
  • the efficient long training sequence and the resource scheduling information are carried in the same data packet.
  • FIG. 2 shows an example of a frame structure of a frame used by the AP to transmit resource scheduling information and an efficient long training sequence.
  • the high-efficiency long training sequence and the resource scheduling information are carried in the same frame (that is, an example of the same data packet), and the resource scheduling information may be carried in the high-efficiency signaling word segment B (HE-SIG-B, High Efficiently Signal Field-B), a highly efficient long training sequence field (HE-LTF, high efficient long training filed) that can be carried in the same frame (or the same data packet).
  • HE-SIG-B High Efficiently Signal Field-B
  • HE-LTF highly efficient long training sequence field
  • the data packet carries an indication identifier, where the indication identifier is used to indicate that the high-efficiency long training sequence is carried in the data packet.
  • the HE-SIG-B is located before the HE-LTF, it is also possible to add in the frame (for example, before the HE-SIG-B) to indicate whether the frame carries an efficient long training sequence.
  • the indication information is such that the STA can learn that the high-efficiency long training sequence is carried after the resource scheduling information according to the indication information, thereby improving the reliability of the communication.
  • Step 1 transmitting an NDPA frame (an example of a frame carrying feedback indication information), indicating a STA that needs to estimate a channel, and parameters of each STA estimating or feeding back channel state information;
  • an NDPA frame an example of a frame carrying feedback indication information
  • Step 2 Send an NDP+ trigger Trigger frame (an example of a frame carrying resource scheduling information and a high-efficiency long training sequence), and carry resource scheduling information in the HE-SIG-B, indicating the STA transmitted by OFDMA and the resource unit allocated during transmission.
  • the resource unit refers to a frequency resource/a space resource/time resource;
  • Step 3 Receive channel state information fed back by the STA on the resource unit corresponding to each STA.
  • the NDP carries multiple LTFs for each STA channel estimation.
  • a typical case of the plurality of LTFs is that the number of LTFs is equal to the number of antennas at the transmitting end.
  • the transmitting end may further carry an indication information bit in the HE-SIG-A or HE-SIG-B for indicating the HE-SIG-B. Then there is no HE-STF/HE-LTF.
  • the STA list in the resource scheduling information includes the STA list in the feedback indication information, and the two may be identical, or the STA in the resource scheduling information may be more than the STA in the feedback indication information. That is to say, the resource scheduling information may allocate a resource unit for the non-channel estimated STA to transmit data or other types of frames, in addition to allocating resource units for channel feedback to the STAs participating in the channel estimation, or even reserve some resource units. Provided to some unknown STAs for contention.
  • Step 1 Receive feedback indication information, and determine, according to the information in the feedback indication information, whether it needs to perform channel estimation or feedback channel state information according to the subsequent efficient long training sequence.
  • Step 2 If it receives an NDP+Trigger frame in the STA list indicated by the feedback indication information, and obtains the resource unit information that is scheduled according to the resource scheduling information carried by the HE-SIG-B, And estimating channel information according to an efficient long training sequence carried by the HE-LTF;
  • Step 2 If it is not in the STA list indicated by the feedback indication information, it can also accept the NDP+Trigger frame and read the resource scheduling information in the HE-SIG-B to know whether it is used by the Trigger or whether there is a resource unit for uplink.
  • OFDMA competition transmission :
  • the non-channel status information frame may be transmitted to the AP at the stage when the STA that is instructed to estimate the channel feeds back the channel state information.
  • the AP If the AP does not allocate resources for it and there is no resource unit available for uplink OFDMA contention, it can choose to stop receiving or even go to sleep during the expected frame transmission time.
  • Step 3 According to the NDP+Trigger frame synchronization, and after the fixed duration, the estimated channel state information is sent in the resource unit indicated by the Trigger by means of UL OFDMA.
  • the fixed duration in step 3 may be a Short Inter-Frame Space (SIFS) or other possible fixed time length.
  • SIFS Short Inter-Frame Space
  • the feedback indication information and the resource scheduling information are carried in the same data packet.
  • FIG. 3 is a schematic diagram showing an example of a frame structure of a frame used by the AP to send resource scheduling information and feedback indication information.
  • the resource scheduling information may be The mapping between the identifier of the STA (which may include the target STA and the target STA and the non-target STA) and each communication resource is recorded, wherein the identifier of one STA can uniquely indicate one STA.
  • the mapping between the target STA and the non-target STA may be added to the mapping relationship, for example, the mapping between the identifier of the target STA and the related parameters of the channel state information that needs to be fed back to the AP is added, for example, after the STA identifier field is added. Feedback indication information field.
  • the target STA may search for the communication resource corresponding to the identifier and the related parameter of the channel state information that needs to be fed back to the AP based on the mapping relationship, and the non-target STA may search for the communication resource corresponding to the identifier based on the mapping relationship.
  • Step 1 Send an NDPA+Trigger frame (an example of a frame carrying feedback indication information and resource scheduling information), indicating a resource unit allocated by one or more STAs in subsequent transmission by OFDMA; and also indicating STAs that need to estimate channels and each The STA estimates or feeds back parameters of the channel state information.
  • NDPA+Trigger frame an example of a frame carrying feedback indication information and resource scheduling information
  • Step 2 Send an NDP frame (an example of a frame carrying an efficient long training sequence) for estimating the channel state information of the STA indicated by the NDPA;
  • Step 3 Receive channel state information fed back by the STA on the resource unit corresponding to each STA.
  • the frame structure shown in FIG. 3 may be introduced on the basis of the resource scheduling information, that is, there is a common domain. (Common field), followed by the information field of each STA. Included in the Common field is an NDPA Included (NDPA Included) for indicating whether the NDPA+Trigger frame contains information of the feedback indication information; if the NDPA Included indicates that the information field of each subsequent STA includes the NDPA field, then This field is included in the information field of each STA.
  • the NDPA field includes a feedback type (Feedback Type) and a column indication (Nc Index), and includes other information related to channel estimation, such as subchannel channel state information corresponding to possible resource units.
  • the NDPA Included can be placed every The information field of each STA. In this case, NDPA Included only indicates whether the current STA contains NDPA.
  • Step 1 Receive an NDPA+Trigger frame, and according to the carried information, it is known whether it is used by the Trigger or whether there is a resource unit for uplink OFDMA contention transmission, and it is known whether it needs to perform channel estimation or feedback channel state information according to the subsequent NDP. .
  • Step 2 If it receives an NDP frame in the STA list that requires channel estimation indicated by the feedback indication information, estimating channel information according to the HE-LTF;
  • Step two If it is in the STA list indicated by the feedback indication information, but does not include the NDPAfield, the non-channel state information frame may be transmitted to the AP at the stage when the STA that is instructed to estimate the channel feeds back the channel state information:
  • Step 2 If it is not in the STA list indicated by the feedback indication information, it may choose to stop receiving, or even go to sleep state, within the expected frame transmission time.
  • Step 3 According to the NDP frame or the NDPA+Trigger frame synchronization, and the fixed duration of the NDP, the estimated channel state information is transmitted in the resource unit indicated by the NDPA+Trigger frame in the OFDMA manner.
  • the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence are carried in the same data packet.
  • FIG. 4 is a schematic diagram showing an example of a frame structure of a frame used by an AP to send feedback indication information, resource scheduling information, and a high-efficiency long training sequence.
  • the resource scheduling information may be a mapping relationship between an identifier of an STA (which may include a target STA and a target STA and a non-target STA) and each communication resource, where the identifier of one STA can be uniquely recorded. Indicates an STA.
  • mapping between the target STA and the non-target STA may be added to the mapping relationship, for example, the mapping between the identifier of the target STA and the related parameters of the channel state information that needs to be fed back to the AP is added, for example, after the STA identifier field is added.
  • Feedback indication information field Also, a field carrying an efficient long training sequence can be added to the frame.
  • the target STA may search for a communication resource corresponding to the identifier and a related parameter of the channel state information that needs to be fed back to the AP based on the mapping relationship, and the non-target STA may search for the communication resource corresponding to the identifier based on the mapping relationship, and the target The STA may obtain an efficient long training sequence from the frame, and perform channel estimation according to the efficient long training sequence to determine channel state information.
  • the feedback indication information and the resource scheduling information are specifically carried in the high-efficiency signaling HE-SIG-B field in the null data packet NDP frame, and the high-efficiency long training sequence is specifically carried in the high-efficiency long training sequence HE- in the same NDP frame. LTF field.
  • Step 1 Send an NDPA+Trigger+NDP frame (an example of a frame carrying feedback indication information, resource scheduling information, and a high-efficiency long training sequence), indicating a resource unit allocated by one or more STAs in subsequent ULOFDMA transmission; It is required to estimate the STA of the channel and the parameters of each STA to estimate or feed back the channel state information; and carry multiple LTFs for the STA to estimate the channel state information indicated by the NDPA.
  • NDPA+Trigger+NDP frame an example of a frame carrying feedback indication information, resource scheduling information, and a high-efficiency long training sequence
  • Step 2 Receive channel state information fed back by the STA on the resource unit corresponding to each STA.
  • the frame structure shown in FIG. 3 may be introduced on the basis of the resource scheduling information, that is, there is one Common field, followed by the information field of each STA.
  • the Common field contains a message indicating NDPA Included to indicate whether the frame contains feedback indication information; if NDPA Included indicates the information domain of each subsequent STA
  • the NDPA field is included, and then the information field of each STA thereafter includes the field.
  • the NDPA field includes a feedback type (Feedback Type) and a column indication (Nc Index), and includes other information related to channel estimation, such as subchannel channel state information corresponding to possible resource units.
  • the NDPA Included identifier may be placed in the information field of each STA. In this case, NDPA Included only indicates whether the current STA contains an NDPA field.
  • Step 1 Receive the NDPA+Trigger+NDP frame, and according to the carrying information in the HE-SIG-B, learn whether it is scheduled or whether there is a resource unit for the uplink OFDMA contention transmission, and know whether it needs to be based on the subsequent NDP. Channel estimation or feedback channel status information.
  • Step 2 If it is in the STA list that requires channel estimation indicated by the HE-SIG-B, estimate the channel information according to the HE-LTF;
  • Step 2 If it is in the STA list indicated by the HE-SIG-B, but does not include the NDPA field, the non-channel state information frame may be transmitted to the AP at the stage when the STA that is instructed to estimate the channel feeds back the channel state information:
  • Step 2 If you are not in the STA list indicated by HE-SIG-B, you can choose to stop receiving or even go to sleep during the expected frame transmission time.
  • Step 3 According to NDPA+Trigger+NDP frame synchronization, and in a fixed time duration thereafter, the estimated channel state information is transmitted in the resource unit indicated by the HE-SIG-B in a UL OFDMA manner.
  • the resource scheduling information is specifically carried in the HE-SIG-B field in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the HE-LTF field in the same NDP frame, and the feedback indication information is specifically carried on the A field in the same NDP frame that is located after the HE-LTF field.
  • FIG. 5 is a schematic diagram showing another example of a frame structure of a frame used by the AP to transmit feedback indication information, resource scheduling information, and feedback indication information.
  • the AP sends a Trigger+NDP frame, and the Trigger+NDP frame contains feedback indication information as its load.
  • the Trigger+NDP frame indicates a resource unit allocated by one or more STAs when subsequently transmitted by UL OFDMA; and carries multiple LTFs for STA estimation channel state information indicated by NDPA; load of NDPA of said Trigger+NDP frame Indicates the STA that needs to estimate the channel and each STA estimate A parameter that counts or feeds back channel state information.
  • the STA can receive the Trigger+NDP frame according to the carrying information in the HE-SIG-B to know whether it is used by the Trigger or whether there is a resource unit for the uplink OFDMA contention transmission; if it is indicated by the HE-SIG-B,
  • One of the LTFs of the HE-LTF estimates the channel and reads the feedback indication information to know whether it needs to estimate or feed back the channel state information according to the entire HE-LTF channel: if the channel state information needs to be fed back, the channel is estimated according to the entire LTF.
  • the data may be transmitted in the resource unit allocated by the HE-SIG-B. Or other types of frames.
  • the STA may firstly calculate or feed back the channel state information according to all the HE-LTF channels, and then read the NDPA and determine whether it needs the feedback channel according to the NDPA. If yes, adjust the channel state information that needs to be fed back according to the indicated feedback parameter. And adjusting the adjusted channel state information after a fixed duration; if the NDPA does not need to feed back the channel state information by itself, the data or other types of frames may be transmitted in the resource unit allocated by the HE-SIG-B. If it is not indicated by HE-SIG-B, it can choose to stop receiving, or even go to sleep, within the expected frame transmission time.
  • the estimated channel state information is transmitted in the resource unit indicated by the HE-SIG-B according to the Trigger+NDP frame synchronization and in the UL OFDMA manner in the subsequent fixed duration.
  • the frame structure of the frame including the feedback indication information, the resource scheduling information, and the feedback indication information enumerated above is only an exemplary description, and the present invention is not limited thereto.
  • it may also be a frame structure as shown in FIG. 6.
  • the second LTF field (HE-LTF 2) carries a high efficiency long training sequence
  • the first LTF field (HE-LTF 1) carries a long training sequence for acquiring feedback indication information.
  • L-STF represents the traditional short training sequence field
  • L-LTF represents the traditional long training sequence field
  • L-SIG represents the traditional signaling field
  • HE-SIG-A represents the efficient signaling field A
  • HE-SIG- B denotes an efficient signaling field B
  • HE-STF denotes an efficient short training sequence field
  • HE-LTF denotes an efficient long training sequence field.
  • STA ID1 identifies the STA identification field corresponding to one STA.
  • the AP may send feedback indication information, resource scheduling information, and a high-efficiency long training sequence, so that at least the channel state information that needs to be fed back to the AP indicated by the feedback indication information can be And determining, by the two target STAs, the communication resource used when the channel state information is fed back according to the resource scheduling information, and performing channel estimation processing according to the high-efficiency long training sequence to determine channel state information that needs to be fed back to the AP, and
  • the time domain resources corresponding to the communication resources used by the target STAs are the same, and the frequency domain resource space resources corresponding to the communication resources used by the target STAs are different, so that each target STA can feed back the channel state to the AP in the same period. Therefore, the AP does not need to receive and obtain channel state information fed back by each target STA one by one. Therefore, the AP can reduce the transmission overhead of receiving channel state information fed back by each STA, improve transmission efficiency, and improve user experience.
  • FIG. 7 is a schematic flowchart of a method 200 for transmitting channel state information according to another embodiment of the present invention, which is described from the perspective of a STA. As shown in FIG. 7, the method 200 includes:
  • the station STA receives the access point AP, and sends the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence, where the feedback indication information is used to indicate at least two target stations STA that need to feed back channel state information to the AP, the resource scheduling information.
  • a communication resource used to indicate that each of the target STAs feeds back channel state information wherein the time domain resources corresponding to the communication resources used by each target STA are the same, and the frequency domain corresponding to the communication resources used by each target STA The resources are different, or the spatial resources corresponding to the communication resources used by the target STAs are different, and the high-efficiency long training sequence is used for channel estimation processing performed by each target STA for determining channel state information;
  • the STA belongs to the STA according to the feedback indication information, perform channel estimation according to the high-efficiency long training sequence to determine channel feedback information, and feed back the channel state information to the AP by using the communication resource according to the resource scheduling information. .
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each of the target STAs correspond to different time-frequency resource blocks in the same frame.
  • the resource scheduling information is further used to indicate a communication resource used by the at least one non-target STA to transmit uplink data to the AP, where the target STA and the time domain corresponding to the communication resource used by the non-target STA
  • the resources are the same, the frequency domain resources corresponding to the communication resources used by the target STA and the non-target STA are different, or the air resources corresponding to the communication resources used by the target STA and the non-target STA are different, and
  • the method also includes:
  • the uplink data is transmitted to the AP by using the communication resource according to the resource scheduling information.
  • the communication resources used by the target STA and the non-target STA correspond to the same frame.
  • the communication resources used by the target STA and the non-target STA correspond to the same Different time-frequency resource blocks in the frame.
  • the efficient long training sequence and the resource scheduling information are carried in the same data packet.
  • the data packet carries an indication identifier, where the indication identifier is used to indicate that the high-efficiency long training sequence is carried in the data packet.
  • the feedback indication information and the resource scheduling information are carried in the same data packet.
  • the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence are carried in the same data packet.
  • the feedback indication information and the resource scheduling information are specifically carried in the high-efficiency signaling field HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the high-efficiency long training sequence in the same NDP frame.
  • Field HE-LTF Field HE-LTF.
  • the resource scheduling information is specifically carried in the HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the HE-LTF in the same NDP frame, and the feedback indication information is specifically carried in the same NDP.
  • the operation of the AP in the method 200 is similar to the action of the AP in the method 100, and the action of the STA in the method 200 is similar to the action of the STA in the method 200.
  • the action of the STA in the method 200 is similar to the action of the STA in the method 200.
  • detailed description thereof is omitted.
  • the AP may send feedback indication information, resource scheduling information, and a high-efficiency long training sequence, so that at least the channel state information that needs to be fed back to the AP indicated by the feedback indication information can be
  • Two target STAs determine a communication resource used when feeding back channel state information according to the resource scheduling information, and can perform channel estimation processing according to the high-efficiency long training sequence to determine channel state information that needs to be fed back to the AP, and by making each target
  • the time domain resources corresponding to the communication resources used by the STAs are the same, and the frequency domain resource space resources corresponding to the communication resources used by the target STAs are different, so that each target STA can feed back channel state information to the AP in the same period. Therefore, the AP does not need to receive and obtain channel state information fed back by each target STA one by one, thereby reducing the transmission overhead of the AP receiving the channel state information fed back by each STA, improving transmission efficiency, and improving user experience.
  • FIGS. 1 through 7 a method of transmitting channel state information according to an embodiment of the present invention is described in detail with reference to FIGS. 1 through 7.
  • FIGS. 8 and 9 an apparatus for transmitting channel state information according to an embodiment of the present invention will be described in detail with reference to FIGS. 8 and 9.
  • FIG. 8 shows a schematic block diagram of an apparatus 300 for transmitting channel state information in accordance with an embodiment of the present invention. As shown in FIG. 8, the apparatus 300 includes:
  • the sending unit 310 is configured to send feedback indication information, resource scheduling information, and a high-efficiency long training sequence, where the feedback indication information is used to indicate at least two target station STAs that need to feed back channel state information to the AP, where the resource scheduling information is used to indicate a communication resource used by each of the target STAs to feed back channel state information, wherein the time domain resources corresponding to the communication resources used by the target STAs are the same, and the frequency domain resources corresponding to the communication resources used by the target STAs are different. Or the spatial resource corresponding to the communication resource used by each target STA is different, and the high-efficiency long training sequence is used for channel estimation processing performed by each target STA for determining channel state information;
  • the receiving unit 320 is configured to receive, by using the communication resource, channel state information that is fed back by each target STA.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each of the target STAs correspond to different time-frequency resource blocks in the same frame.
  • the resource scheduling information is further used to indicate a communication resource used by the at least one non-target STA to transmit uplink data to the AP, where the target STA and the time domain corresponding to the communication resource used by the non-target STA
  • the resources are the same, and the frequency domain resources corresponding to the communication resources used by the target STA and the non-target STA are different, or the spatial resources corresponding to the communication resources used by the target STA and the non-target STA are different.
  • the communication resources used by the target STA and the non-target STA correspond to the same frame.
  • the communication resources used by the target STA and the non-target STA correspond to different time-frequency resource blocks in the same frame.
  • the efficient long training sequence and the resource scheduling information are carried in the same data packet.
  • the data packet carries an indication identifier, where the indication identifier is used to indicate that the high-efficiency long training sequence is carried in the data packet.
  • the feedback indication information and the resource scheduling information are carried in the same data packet.
  • the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence are carried in the same data packet.
  • the feedback indication information and the resource scheduling information are specifically carried in the high-efficiency signaling field HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the high-efficiency long training sequence in the same NDP frame.
  • Field HE-LTF Field HE-LTF.
  • the resource scheduling information is specifically carried in the HE-SIG-B in the null data packet NDP frame.
  • the high-efficiency long training sequence is specifically carried in the HE-LTF in the same NDP frame, and the feedback indication information is specifically carried in a field in the same NDP frame after the HE-LTF.
  • the apparatus 300 for transmitting channel state information may correspond to an AP in the method of the embodiment of the present invention, and each unit in the apparatus 300 for transmitting channel state information, that is, a module and the above other operations and/or functions respectively In order to implement the corresponding process of the method 100 in FIG. 1, for brevity, details are not described herein again.
  • the apparatus for transmitting channel state information by causing the AP to send the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence, so that the feedback indication information indicates that at least the channel state information needs to be fed back to the AP.
  • Two target STAs determine a communication resource used when feeding back channel state information according to the resource scheduling information, and can perform channel estimation processing according to the high-efficiency long training sequence to determine channel state information that needs to be fed back to the AP, and by making each target
  • the time domain resources corresponding to the communication resources used by the STAs are the same, and the frequency domain resource space resources corresponding to the communication resources used by the target STAs are different, so that each target STA can feed back channel state information to the AP in the same period. Therefore, the AP does not need to receive and obtain channel state information fed back by each target STA one by one, thereby reducing the transmission overhead of the AP receiving the channel state information fed back by each STA, improving transmission efficiency, and improving user experience.
  • FIG. 9 shows a schematic block diagram of an apparatus 400 for transmitting channel state information in accordance with an embodiment of the present invention. As shown in FIG. 9, the apparatus 400 includes:
  • the receiving unit 410 is configured to receive, by the access point AP, the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence, where the feedback indication information is used to indicate at least two target stations STA that need to feed back channel state information to the AP, the resource
  • the scheduling information is used to indicate the communication resources used by each of the target STAs to feed back the channel state information, where the time domain resources corresponding to the communication resources used by the target STAs are the same, and the communication resources used by the target STAs are corresponding.
  • the frequency domain resources are different, or the spatial resources corresponding to the communication resources used by the target STAs are different, and the high-efficiency long training sequence is used for channel estimation processing performed by each target STA for determining channel state information;
  • the processing unit 420 is configured to perform channel estimation according to the high-efficiency long training sequence to determine channel feedback information, and control the sending unit 430 to pass the communication resource according to the resource scheduling information, if it is determined according to the feedback indication information that belongs to the station STA.
  • the channel state information is fed back to the AP.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each of the target STAs correspond to different ones in the same frame.
  • Time-frequency resource block is
  • the resource scheduling information is further used to indicate a communication resource used by the at least one non-target STA to transmit uplink data to the AP, where the target STA and the time domain corresponding to the communication resource used by the non-target STA
  • the resources are the same, the frequency domain resources corresponding to the communication resources used by the target STA and the non-target STA are different, or the air resources corresponding to the communication resources used by the target STA and the non-target STA are different, and
  • the processing unit is further configured to, if it is determined to belong to the non-target STA according to the feedback indication information, control, according to the resource scheduling information, the sending unit to transmit uplink data to the AP by using the communication resource.
  • the communication resources used by the target STA and the non-target STA correspond to the same frame.
  • the communication resources used by the target STA and the non-target STA correspond to different time-frequency resource blocks in the same frame.
  • the efficient long training sequence and the resource scheduling information are carried in the same data packet.
  • the data packet carries an indication identifier, where the indication identifier is used to indicate that the high-efficiency long training sequence is carried in the data packet.
  • the feedback indication information and the resource scheduling information are carried in the same data packet.
  • the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence are carried in the same data packet.
  • the feedback indication information and the resource scheduling information are specifically carried in the high-efficiency signaling field HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the high-efficiency long training sequence in the same NDP frame.
  • Field HE-LTF Field HE-LTF.
  • the resource scheduling information is specifically carried in the HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the HE-LTF in the same NDP frame, and the feedback indication information is specifically carried in the same NDP.
  • the apparatus 400 for transmitting channel state information may correspond to a STA in the method of the embodiment of the present invention, and each unit in the apparatus 400 for transmitting channel state information, that is, a module and the above other operations and/or functions respectively In order to implement the corresponding process of the method 200 in FIG. 7, for brevity, details are not described herein again.
  • the apparatus for transmitting channel state information can enable the AP to send feedback indication information, resource scheduling information, and a high-efficiency long training sequence, so that the feedback indication information can be indicated.
  • At least two target STAs that need to feed back channel state information to the AP determine communication resources used when feeding back channel state information according to the resource scheduling information, and can perform channel estimation processing according to the high-efficiency long training sequence to determine that feedback needs to be provided to the AP.
  • Channel state information and by making the time domain resources corresponding to the communication resources used by the target STAs the same, and making the frequency domain resource space resources corresponding to the communication resources used by the target STAs different, each target can be made The STA feeds back the channel state information to the AP in the same period.
  • the AP does not need to receive and obtain the channel state information fed back by the target STAs one by one. Therefore, the AP can reduce the transmission overhead of the channel state information fed back by the STAs, improve the transmission efficiency, and improve the performance. user experience.
  • FIG. 10 shows a schematic block diagram of an apparatus 500 for transmitting channel state information in accordance with an embodiment of the present invention.
  • the device 500 includes:
  • processor 520 connected to the bus
  • transceiver 540 connected to the bus
  • the processor by using the bus, invokes a program stored in the memory, for controlling the transceiver to send feedback indication information, resource scheduling information, and a high-efficiency long training sequence, where the feedback indication information is used to indicate that the AP needs to be fed back.
  • the resource scheduling information is used to indicate a communication resource used by each of the target STAs to feed back channel state information, where the time domain resources corresponding to the communication resources used by each target STA are used.
  • the frequency domain resources corresponding to the communication resources used by the target STAs are different, or the spatial resources corresponding to the communication resources used by the target STAs are different, and the high-efficiency long training sequence is used by each target STA.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each of the target STAs correspond to different time-frequency resource blocks in the same frame.
  • the resource scheduling information is further used to indicate a communication resource used by at least one non-target STA to transmit uplink data to the AP, where the target STA and the non-target STA use
  • the time domain resources corresponding to the communication resources are the same, and the frequency domain resources corresponding to the communication resources used by the target STA and the non-target STA are different, or the communication resources used by the target STA and the non-target STA are corresponding.
  • Airspace resources are different.
  • the communication resources used by the target STA and the non-target STA correspond to the same frame.
  • the communication resources used by the target STA and the non-target STA correspond to different time-frequency resource blocks in the same frame.
  • the efficient long training sequence and the resource scheduling information are carried in the same data packet.
  • the data packet carries an indication identifier, where the indication identifier is used to indicate that the high-efficiency long training sequence is carried in the data packet.
  • the feedback indication information and the resource scheduling information are carried in the same data packet.
  • the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence are carried in the same data packet.
  • the feedback indication information and the resource scheduling information are specifically carried in the high-efficiency signaling field HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the high-efficiency long training sequence in the same NDP frame.
  • Field HE-LTF Field HE-LTF.
  • the resource scheduling information is specifically carried in the HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the HE-LTF in the same NDP frame, and the feedback indication information is specifically carried in the same NDP.
  • the processor can also be referred to as a CPU.
  • the memory can include read only memory and random access memory and provides instructions and data to the processor. A portion of the memory may also include non-volatile line random access memory (NVRAM).
  • device 500 may be embedded or may itself be an AP, and may also include a carrier that houses the transmit circuitry and the receive circuitry to allow for data transmission and reception between device 500 and a remote location. The transmit and receive circuits can be coupled to the antenna.
  • the various components of device 500 are coupled together by a bus, wherein the bus includes a power bus, a control bus, and a status signal bus in addition to the data bus. However, for the sake of clarity, various buses are labeled as buses in the figure.
  • the decoder in a specific different product may be integrated with the processing unit.
  • the processor may implement or perform the steps and logic blocks disclosed in the method embodiments of the present invention.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor, decoder or the like.
  • the steps of the method disclosed in connection with the embodiments of the present invention may be directly embodied as hardware.
  • the processor execution is complete or is performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the processor may be a central processing unit (“CPU"), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and dedicated processors. Integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory can include read only memory and random access memory and provides instructions and data to the processor.
  • a portion of the memory may also include a non-volatile random access memory.
  • the memory can also store information of the device type.
  • the bus system may include a power bus, a control bus, and a status signal bus in addition to the data bus.
  • a power bus may include a power bus, a control bus, and a status signal bus in addition to the data bus.
  • the various buses are labeled as bus systems in the figure.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.
  • the apparatus 500 for transmitting channel state information may correspond to an AP in the method of the embodiment of the present invention, and each unit in the apparatus 500 for transmitting channel state information, that is, a module and the above other operations and/or functions respectively In order to implement the corresponding process of the method 100 in FIG. 1, for brevity, details are not described herein again.
  • the device for transmitting channel state information by causing the AP to send the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence, can enable the feedback indication information to feed back at least the channel state information to the AP.
  • Two target STAs determine a communication resource used when feeding back channel state information according to the resource scheduling information, and can perform channel estimation processing according to the high-efficiency long training sequence to determine channel state information that needs to be fed back to the AP, and by making each target
  • the time domain resources corresponding to the communication resources used by the STAs are the same, and the frequency domain resource space resources corresponding to the communication resources used by the target STAs are different, and the target STAs can be made in the same
  • the channel state information is fed back to the AP in a period of time. Therefore, the AP does not need to receive and obtain the channel state information fed back by each target STA one by one, thereby reducing the transmission overhead of the AP receiving the channel state information fed back by each STA, improving the transmission efficiency, and improving the user experience. .
  • FIG. 11 shows a schematic block diagram of an apparatus 600 for transmitting channel state information in accordance with an embodiment of the present invention. As shown in FIG. 11, the device 600 includes:
  • processor 620 connected to the bus
  • transceiver 640 connected to the bus
  • the processor by using the bus, invokes a program stored in the memory, for controlling the transceiver to receive the access point AP to send feedback indication information, resource scheduling information, and a high-efficiency long training sequence, where the feedback indication information is used to indicate At least two target station STAs that need to feed back channel state information to the AP, the resource scheduling information is used to indicate communication resources used when each of the target STAs feeds back channel state information, where the communication resources used by each target STA are used.
  • the corresponding time domain resources are the same, the frequency domain resources corresponding to the communication resources used by the target STAs are different, or the airspace resources corresponding to the communication resources used by the target STAs are different, and the high-efficiency long training sequence is used for each of the Channel estimation processing performed by the target STA for determining channel state information;
  • the transceiver to feed back to the AP according to the resource scheduling information.
  • the channel status information if, according to the feedback indication information, determining that the STA belongs to the station, performing channel estimation according to the high-efficiency long training sequence to determine channel feedback information, and controlling, by the communication resource, the transceiver to feed back to the AP according to the resource scheduling information.
  • the communication resources used by each of the target STAs correspond to the same frame.
  • the communication resources used by each of the target STAs correspond to different time-frequency resource blocks in the same frame.
  • the resource scheduling information is further used to indicate a communication resource used by the at least one non-target STA to transmit uplink data to the AP, where the target STA and the time domain corresponding to the communication resource used by the non-target STA
  • the resources are the same, the frequency domain resources corresponding to the communication resources used by the target STA and the non-target STA are different, or the air resources corresponding to the communication resources used by the target STA and the non-target STA are different, and
  • the processor is further configured to control, according to the resource scheduling information, the transceiver to transmit uplink data to the AP according to the resource scheduling information according to the feedback indication information.
  • the communication resources used by the target STA and the non-target STA correspond to the same frame.
  • the communication resources used by the target STA and the non-target STA correspond to different time-frequency resource blocks in the same frame.
  • the efficient long training sequence and the resource scheduling information are carried in the same data packet.
  • the data packet carries an indication identifier, where the indication identifier is used to indicate that the high-efficiency long training sequence is carried in the data packet.
  • the feedback indication information and the resource scheduling information are carried in the same data packet.
  • the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence are carried in the same data packet.
  • the feedback indication information and the resource scheduling information are specifically carried in the high-efficiency signaling field HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the high-efficiency long training sequence in the same NDP frame.
  • Field HE-LTF Field HE-LTF.
  • the resource scheduling information is specifically carried in the HE-SIG-B in the null data packet NDP frame, where the high-efficiency long training sequence is specifically carried in the HE-LTF in the same NDP frame, and the feedback indication information is specifically carried in the same NDP.
  • the processor can also be referred to as a CPU.
  • the memory can include read only memory and random access memory and provides instructions and data to the processor. A portion of the memory may also include non-volatile line random access memory (NVRAM).
  • device 600 may be embedded or may itself be a STA, and may also include a carrier that houses the transmit circuitry and the receive circuitry to allow for data transmission and reception between device 600 and a remote location.
  • the transmit and receive circuits can be coupled to the antenna.
  • the various components of device 600 are coupled together by a bus, wherein the bus includes a power bus, a control bus, and a status signal bus in addition to the data bus. However, for the sake of clarity, various buses are labeled as buses in the figure.
  • the decoder in a specific different product may be integrated with the processing unit.
  • the processor may implement or perform the steps and logic blocks disclosed in the method embodiments of the present invention.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor, decoder or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the processor may be a central processing unit (Central) Processing Unit (referred to as "CPU"), which can also be other general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices. , discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory can include read only memory and random access memory and provides instructions and data to the processor.
  • a portion of the memory may also include a non-volatile random access memory.
  • the memory can also store information of the device type.
  • the bus system may include a power bus, a control bus, and a status signal bus in addition to the data bus.
  • a power bus may include a power bus, a control bus, and a status signal bus in addition to the data bus.
  • the various buses are labeled as bus systems in the figure.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.
  • the apparatus 600 for transmitting channel state information may correspond to a STA in the method of the embodiment of the present invention, and each unit in the apparatus 600 for transmitting channel state information, that is, a module and the above other operations and/or functions respectively In order to implement the corresponding process of the method 200 in FIG. 7, for brevity, details are not described herein again.
  • the device for transmitting channel state information by causing the AP to send the feedback indication information, the resource scheduling information, and the high-efficiency long training sequence, can enable the feedback indication information to feed back at least the channel state information to the AP.
  • Two target STAs determine a communication resource used when feeding back channel state information according to the resource scheduling information, and can perform channel estimation processing according to the high-efficiency long training sequence to determine channel state information that needs to be fed back to the AP, and by making each target
  • the time domain resources corresponding to the communication resources used by the STAs are the same, and the frequency domain resource space resources corresponding to the communication resources used by the target STAs are different, so that each target STA can feed back channel state information to the AP in the same period. Therefore, the AP does not need to receive and obtain channel state information fed back by each target STA one by one, thereby reducing the transmission overhead of the AP receiving the channel state information fed back by each STA, improving transmission efficiency, and improving user experience.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including Several instructions are used to make a computer device (which can be a personal computer, a server, Or a network device or the like) performing all or part of the steps of the method of the various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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

Abstract

L'invention concerne un procédé et un dispositif de transmission d'informations d'état de canal pour réduire les surdébits de transmission pour un point d'accès (AP) recevant des informations d'état de canal renvoyées par chaque station (STA), et améliorer l'efficacité de transmission et l'expérience d'utilisateur. Le procédé consiste : à transmettre, par l'AP, des informations d'instruction de rétroaction, des informations de planification de ressource et une séquence de champs d'apprentissage longs de haute efficacité (HE-LTF) ; et à recevoir, par l'intermédiaire de ressources de communication, les informations d'état de canal renvoyées par chaque STA cible. Les informations d'instruction de rétroaction sont utilisées pour donner une instruction à au moins deux STA cibles ayant besoin de renvoyer les informations d'état de canal à l'AP. Les informations de planification de ressource sont utilisées pour ordonner les ressources de communication utilisées lorsque chaque STA cible renvoie les informations d'état de canal, des ressources de domaine temporel correspondant aux ressources de communication utilisées par chaque STA cible étant les mêmes, des ressources de domaine fréquentiel correspondant aux ressources de communication utilisées par chaque STA cible étant différentes, ou des ressources de domaine spatial correspondant aux ressources de communication utilisées par chaque STA cible étant différentes. La séquence HE-LTF est utilisée pour réaliser un traitement d'estimation de canal pour la détermination des informations d'état de canal réalisée par chaque STA cible.
PCT/CN2015/095619 2015-03-04 2015-11-26 Procédé et dispositif de transmission d'informations d'état de canal WO2016138778A1 (fr)

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JP7248708B2 (ja) * 2018-08-23 2023-03-29 オッポ広東移動通信有限公司 フィードバック情報の伝送方法、装置及び通信デバイス

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