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WO2017041590A1 - 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
WO2017041590A1
WO2017041590A1 PCT/CN2016/090777 CN2016090777W WO2017041590A1 WO 2017041590 A1 WO2017041590 A1 WO 2017041590A1 CN 2016090777 W CN2016090777 W CN 2016090777W WO 2017041590 A1 WO2017041590 A1 WO 2017041590A1
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WIPO (PCT)
Prior art keywords
ltf
additional
field
null data
packet
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Ceased
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PCT/CN2016/090777
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English (en)
Chinese (zh)
Inventor
于健
林梅露
杨讯
郭宇宸
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for transmitting channel state information.
  • MU-MIMO multi-user multiple input
  • MU-MIMO utilizes a spatial dimension to implement multiple user transmissions through multiple parallel channels.
  • 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.
  • MU-MIMO technology can be applied to a WLAN network, in order to simultaneously schedule multiple users to perform channel state information feedback, when the station (STA) capacity is limited.
  • An access point (AP, Access Point) can send a null packet declaration (NDPA, Null Data Packet Announcement), a null data packet (NDP, Null Data Packet), and a beamforming report polling frame (Beamforming Report Poll, BF Report Poll Therefore, the STA performs channel estimation according to the information carried by the NDPA and the high efficient long training filed (HE-LTF) carried by the NDP, and feeds back the channel state information to the AP within a long time range.
  • NDPA Null Data Packet Announcement
  • NDP Null Data Packet
  • Beamforming Report Poll Beamforming Report Poll, BF Report Poll
  • STAs are introduced in the 802.11ax standard, and some STAs cannot immediately provide feedback.
  • STAs have limited capabilities without supporting immediate feedback or limited resources allocated by APs.
  • STAs cannot immediately perform channel state information. Feedback, the AP may waste resources due to long waiting for receiving channel state information, thereby reducing channel state information transmission efficiency.
  • the embodiments of the present invention provide a method and apparatus for transmitting channel state information, which can improve transmission efficiency of channel state information.
  • an embodiment of the present invention provides a method for transmitting channel state information, including:
  • null data packet NDP Generating a null data packet NDP, the null data packet including a high efficiency long training sequence HE-LTF and a padding field, the padding field being used to allow the target station to have additional time to receive channel state information;
  • the null data packet is sent.
  • the padding field includes a packet extension field or an additional HE-LTF.
  • the length of the packet extension field or the number of additional HE-LTF symbols is determined by at least one of the following conditions: , HE-LTF mode, estimated spatial stream number.
  • the null data packet includes an indication field, where the indication field is located in an efficient signaling field of the null data packet In the SIG, the indication field is used to define packet extension field information or additional HE-LTF information.
  • the packet extension field information includes: a length of the packet extension field, or whether the packet extension field is greater than 16 us.
  • the additional HE-LTF information includes: the number of additional HE-LTF symbols, or whether there is an additional HE- LTF.
  • the additional HE-LTF in the null data packet is the same as the self-contained HE-LTF portion.
  • the additional HE-LTF in the null data packet is the same as the self-contained HE-LTF.
  • the method for indicating the packet extension field information and the additional HE-LTF information includes at least one of the following: - Extra bits in the SIG, reuse the modulation code set MCS in the HE-SIG, and reuse the packet extended PE field in the HE-SIG.
  • an embodiment of the present invention provides an apparatus for transmitting channel state information, including:
  • the baseband circuit generates a null data packet NDP, where the null data packet includes a high efficiency long training sequence HE-LTF and a padding field, where the padding field is used to allow the target station to have additional time to receive channel state information;
  • a radio frequency circuit for transmitting the null data packet.
  • the padding field includes a packet extension field or an additional HE-LTF.
  • the length of the packet extension field or the number of additional HE-LTF symbols is determined by at least one of the following conditions: , HE-LTF mode, estimated spatial stream number.
  • the null data packet includes an indication field, where the indication field is located in an efficient signaling field of the null data packet In the SIG, the indication field is used to define packet extension field information or additional HE-LTF information.
  • the packet extension field information includes: a length of the packet extension field, or whether the packet extension field is greater than 16 us.
  • the additional HE-LTF information includes: the number of additional HE-LTF symbols, or whether there is an additional HE-LTF.
  • the additional HE-LTF in the null data packet is the same as the self-contained HE-LTF portion.
  • the additional HE-LTF in the null data packet is the same as the self-contained HE-LTF.
  • the method for indicating the packet extension field information and the additional HE-LTF information includes at least one of the following: - Extra bits in the SIG, reuse the modulation code set MCS in the HE-SIG, and reuse the packet extended PE field in the HE-SIG.
  • the embodiment of the present invention generates a null data packet NDP, where the null data packet includes an HE-LTF and a packet extension field for the target STA to perform channel estimation, or the null data packet is included for the target STA to perform.
  • the HE-LTF of the channel estimation and the additional HE-LTF can avoid the waste of resources caused by the partial feedback not supporting the immediate feedback, thereby improving the transmission efficiency of the channel state information.
  • FIG. 1 is a diagram of an application scenario of the present invention.
  • FIG. 3 is a schematic diagram of a null data packet structure in the first embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a null data packet structure in the first embodiment of the present invention.
  • FIG. 5 is a structural diagram of a physical device according to Embodiment 2 of the present invention.
  • the embodiment of the present invention can be applied to a wireless local area network (English: Wireless Local Area Network, WLAN for short).
  • the standard adopted by the WLAN is IEEE (English: Institute of Electrical and Electronics Engineers) 802.11 series.
  • the WLAN may include multiple basic service sets (English: Basic Service Set, BSS for short).
  • the network nodes in the basic service set are stations (English: Station, abbreviated as STA).
  • the site includes the access point class (abbreviation: AP). , English: Access Point) and non-access point class sites (English: None Access Point Station, referred to as: Non-AP STA).
  • Each basic service set may contain one AP and multiple Non-AP STAs associated with the AP.
  • Access point class sites also known as wireless access points or hotspots.
  • the AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the AP may be a terminal device or a network device with a WiFi (English: Wireless Fidelity) chip.
  • the AP may be a device supporting the 802.11ax system. Further, the AP may be a device supporting multiple WLAN technologies such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • Non-AP STA A non-access point class (English: None Access Point Station, referred to as Non-AP STA), which can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • Non-AP STA can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • mobile phone supporting WiFi communication function tablet computer supporting WiFi communication function, set-top box supporting WiFi communication function, smart TV supporting WiFi communication function, wisdom supporting WiFi communication function
  • Wearable devices in-vehicle communication devices that support WiFi communication, and computers that support WiFi communication.
  • the site can support the 802.11ax system.
  • the site supports multiple WLAN formats such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • Figure 1 is a system diagram of a typical WLAN deployment scenario, including an AP and three STAs, and the AP communicates with STA1, STA2, and STA3, respectively.
  • the AP can perform uplink and downlink transmission with different STAs on different time-frequency resources.
  • the AP can adopt different modes for uplink and downlink transmission, such as OFDMA single-user multiple-input multiple-output (SU-MIMO) mode, or OFDMA multi-user multiple input multiple output (Multi-User Multiple).
  • SU-MIMO OFDMA single-user multiple-input multiple-output
  • Multi-User Multiple OFDMA multi-user multiple input multiple output
  • MU-MIMO -Input Multiple-Output
  • the AP may simultaneously send a Physical Layer Protocol Data Unit (PPDU) to multiple sites or multiple site groups.
  • PPDU Physical Layer Protocol Data Unit
  • multiple sites may refer to sites in SU-MIMO mode
  • multiple site groups may refer to site groups in MU-MIMO mode.
  • the PPDU sent by the AP includes a Physical Layer Convergence Procedure (PLCP) header field and a data field, where the PLCP Header includes a legacy preamble (L-Preamble) and an efficient preamble.
  • the preamble portion includes a High Efficient Signaling A (HE-SIGA) portion and a High Efficient Signaling B (HE-SIGB) portion.
  • the PPDU may also include a Media Access Control (MAC) portion.
  • MAC Media Access Control
  • Embodiment 1 of the present invention provides a method for transmitting a channel status message, which may be applied to a station, such as the AP and STA1-STA3 in FIG. 1, which can support a next-generation WLAN standard, such as the 802.11ax system.
  • 2 is a flow chart of the method for transmitting a channel status message, and the specific steps are as follows:
  • Step 110 Generate a null data packet NDP, where the null data packet includes a high efficiency long training sequence HE-LTF and a padding field, where the padding field is used to allow the target station to have additional time to receive the message. Road status information.
  • Step 120 Send the null data packet.
  • PE Chonese: Packet Extension
  • the role of PE (Chinese: Packet Extension) in the data frame is to provide additional time for the site to process the data, so the length of the PE is related to the ability of the site to process data.
  • different sites may require PEs of different lengths; for the same site, different (BW, Nsts, MCS) combinations may require PEs of different lengths.
  • the length of the PE is related to the ability of the site to process the data.
  • the possible length of PE is 0us, 4us, 8us, 12us, 16us.
  • the data part is not included in the NDP, and the station uses NDP to calculate channel state information. Therefore, if a PE needs to be added after the NDP, the length of the NDP PE requires additional negotiation between the site and the access point, or is pre-defined by the system.
  • the padding field includes a packet extension field or an additional HE-LTF.
  • the null data packet further includes a self-contained HE-LTF, which is located after the HE-STF, and is used for channel estimation of the target station.
  • the self-contained HE-LTF is a spatial stream that needs to be estimated. The number corresponds to the HE-LTF symbol.
  • null data packet including the packet extension field is as shown in FIG. 3, and the structure of the null data packet including the additional HE-LTF is as shown in FIG. 4.
  • the length of the packet extension field or the number of additional HE-LTF symbols is determined by at least one of the following conditions: bandwidth, mode of the HE-LTF, and estimated number of spatial streams.
  • the pre-specification may be made only according to the number of spatial streams Nsts or HE-LTF symbols; or may be pre-specified according to the mode of the HE-LTF, ie 2x or 4x, where 2x HE-LTF refers to HE-LTF with 128 subcarriers, 4x HE-LTF refers to HE-LTF with 256 subcarriers, and the mode of LTF in the original 11ac is 1x, that is, contains 64 subcarriers;
  • the bandwidth BW is pre-specified; it can also be pre-specified according to any combination of multiple factors such as spatial stream, HE-LTF mode, and bandwidth.
  • the system may also directly pre-specify the addition of one or more PEs of different lengths after the NDP according to the relevant parameters.
  • An example is to pre-specify only according to the number of spatial streams Nsts, for example 4x or 2x HE-LTF for Nsts>n1, specifying a PE with x1 after NDP; for 4x or 2x HE-LTF for Nsts ⁇ n2, It is specified to add x2 PE after NDP; in particular, n1 may be 4, n2 may be 5, x1 may be 16us, and x2 may be 8us.
  • Another example is to pre-specify only according to the HE-LTF mode. For example, for 4x HE-LTF, it is specified to add x1 PE after NDP; for 2x HE-LTF, it is specified to add x2 PE after NDP; , x1 can be 16us, and x2 can be 8us.
  • Another example is to pre-specify according to the mode of HE-LTF and the number of spatial streams Nsts. For example, for 4x HE-LTF with Nsts>n1, PE with x1 added after NDP is specified; 4x HE- for Nsts ⁇ n2 LTF, which specifies the addition of x2 PE after NDP; for Nxs>n1 2x HE-LTF, add x3 PE after NDP; for Nsts ⁇ n2 2x HE-LTF, add x4 PE after NDP; in particular, N1 can be 4, n2 can be 5, x1 can be 16us, x2 can be 8us, x3 can be 8us, and x4 can be 4us.
  • Another example is to pre-specify according to the number of bandwidth BWs and spatial streams Nsts, for example 4x or 2x HE-LTF (BW>m1MHz, Nsts>n1), specifying the addition of x1 PE after NDP; for (BW 4x or 2x HE-LTF of ⁇ m2MHz, Nsts ⁇ n2), specifying the addition of x2 PE after NDP; for 4x or 2x HE-LTF of (BW>m1MHz, Nsts ⁇ n2), specifying the addition of x3 PE after NDP For 4x or 2x HE-LTF (BW ⁇ m2MHz, Nsts>n1), it is specified to add x4 PE after NDP;
  • no pre-specification is made according to any parameters. For example, it may be directly specified to add a length of x1 PE after NDP.
  • the site may report the capability of preparing the channel state information to the access point together with the capability of processing the data, or may specifically report its ability to prepare the channel state information.
  • Threshold_x1 and threshold_x2 are defined in the HE Capability field.
  • Threshold_x1 is used to determine when the maximum PE length is x1us
  • threshold_x2 is used to determine when the maximum is The PE length is x2us.
  • the largest PE refers to the length of the PE required under the maximum supported spatial stream.
  • 1 bit can be used to indicate each. Specifically, when the 1 bit is the first value, it indicates that the current threshold is not used, and when the 1 bit is the second value, it indicates that the current threshold is used.
  • both bits are the first value, it means that PE is not required for 2x or 4x HE-LTF, or the maximum PE required is smaller than x1us and x2us. If the two bits are all the second value, the maximum PE length is x1us for the 2x HE-LTF; the maximum PE length is x2us for the 4x HE-LTF; the first bit corresponding to the threshold_x2 is the first The value corresponding to the 1 bit of the threshold_x1 is the second value, indicating that the maximum PE length is x1us regardless of the 2x or 4x HE-LTF; if the 1 bit corresponding to the threshold_x2 is the second value, the 1 bit corresponding to the threshold_x1 is the first The value indicates that the maximum PE length is x2us regardless of the 2x or 4x HE-LTF.
  • two bits can be used for indication, and two bits correspond to four values. Specifically, when the 2 bits are the first value, the PE can reach the current threshold in the 2x HE-LTF mode and the 4x HE-LTF mode; when the 2 bits are the second value, the 4x HE-LTF mode is indicated. , PE can reach the current threshold; when these 2 bits are the third value, it means empty or invalid. For example, if both 2 bits are the third value, it means that PE is not required for 2x or 4x HE-LTF, or only PE smaller than x1us and x2us is needed.
  • the maximum PE length is x2us in the 4x HE-LTF mode, and is not required in the 2x HE-LTF mode. PE, or, the largest PE required is smaller than x1us and x2us. If the 2 bits corresponding to the threshold_x2 are the third value and the 2 bits corresponding to the threshold_x1 are the first value, the maximum PE length is x1us in the 2x and 4x HE-LTF modes.
  • Another example is that the site locally defines multiple HE-LTF thresholds based on its capabilities.
  • the first row indicates the possible length of the PE, which may be x1 to x5 as listed in the table, or may be any one or some of the five values.
  • the first column represents the HE-LTF mode, including 2x and 4x HE-LTF.
  • the contents of the table indicate the number of HE-LTF symbols. Taking n3 as an example, if NDP transmits 2x HE-LTF, when the number of HE-LTF symbols is greater than (greater than or equal to) n3 and less than or equal to (less than) n4, it is necessary to add x3us PE to the site. Since NDP may be sent to a group of sites, the longest PE in all sites is required as the PE that the current NDP needs to add.
  • a PE of up to 16 us may not be sufficient to provide sufficient time for the station to prepare channel state information. Therefore, it is possible to specifically design a PE larger than 16 us for NDP, such as 32 us, 48 us, and the like.
  • the site can define multiple HE-LTF thresholds according to its own capabilities, as shown below:
  • the null data packet includes an indication field, where the indication field is located in an efficient signaling field HE-SIG of the null data packet, where the indication field is used to define packet extension field information or additional HE-LTF information. .
  • the packet extension field information includes: a length of the packet extension field, or whether the packet extension field is greater than 16 us.
  • the method for indicating the packet extension field information and the additional HE-LTF information includes at least one of the following: an extra bit in the HE-SIG, reusing the modulation coding set MCS in the HE-SIG, and reusing the HE-
  • the packet in the SIG extends the PE domain.
  • the following mainly introduces the indication method of the packet extension field information.
  • the packet extension field information in the HE-SIG is used to inform the station PE length.
  • a 1 bit is included in the HE-SIG to indicate whether the current frame contains a PE greater than 16 us; if so, the PE domain or the MCS field in the HE-SIG is reused to indicate the length of the current PE.
  • the two unused combinations can be used to indicate that the current frame contains a PE greater than 16 us.
  • the two unused combinations may also represent specific PE lengths, respectively, such that one of the unused combinations represents a 32us PE; the other unused combination represents a 48us PE.
  • the additional HE-LTF information includes: the number of additional HE-LTF symbols, or whether there is an additional HE-LTF.
  • the indication of additional HE-LTF information can be determined through negotiation between sites or by standards.
  • the P matrix of the HE-LTF in the null data packet is selected according to the sum of the additional HE-LTF and the self-contained HE-LTF.
  • the additional HE-LTF in the null data packet is the same as the self-contained HE-LTF part, or the additional HE-LTF in the null data packet is all the same as the own HE-LTF.
  • the method for indicating the packet extension field information and the additional HE-LTF information includes at least one of the following: an extra bit in the HE-SIG, reusing the modulation coding set MCS in the HE-SIG, and reusing the HE-
  • the packet in the SIG extends the PE domain.
  • the following mainly introduces the indication method of additional HE-LTF information.
  • the additional HE-LTF information in the HE-SIG to inform the site if there is any additional HE-LTF, or the number of additional HE-LTF symbols.
  • the number of additional HE-LTF symbols in the NDP is n1, and the number of HE-LTF symbols in the NDP itself is n2, so the total number of HE-LTF symbols in the NDP is n1+n2.
  • the P matrix of the HE-LTF in the null data packet is selected according to the sum of the additional HE-LTF and the actual HE-LTF n1+n2; in another way, n1 is copied in the n2 HE-LTFs.
  • HE-LTF acts as an additional HE-LTF.
  • the channel estimation can be performed only by the number of HE-LTF symbols that are self-contained.
  • additional HE-LTF can be used simultaneously to improve the channel estimation accuracy. Sex.
  • NDP may be sent to a group of sites, the number of additional HE-LTF symbols that need to be the most in all sites is taken as the number of additional HE-LTF symbols that need to be added by the current NDP.
  • the first method of indicating the number of additional HE-LTF symbols is to include an indication bit in the HE-SIG (HE-SIG-A or HE-SIG-B or both) indicating the current The number of additional HE-LTF symbols.
  • the receiving end After the receiving end reads the field of the number of additional HE-LTF symbols in the HE-SIG, the number of total HE-LTF symbols included in the current frame can be known, and the end position of the current frame can be known.
  • the number of HE-LTF symbols that are themselves included is determined by the number of spatial streams indicated by Nsts in HE-SIGA.
  • the indication bit indicates whether the current frame contains an additional HE-LTF, or indicates whether the current frame is an NDP.
  • the method of notification may be to reuse some of the fields in the HE-SIG, such as a PE domain, an MCS domain, and the like. It is also possible to simultaneously indicate whether the current frame contains an additional HE-LTF by reusing the partial field in the HE-SIG, or indicate whether the current frame is NDP, and the number of additional HE-LTF symbols.
  • the two unused combinations can be used to indicate that the current frame contains an additional HE-LTF. , or the current frame is NDP.
  • the two unused combinations can also be separately Indicates that the number of additional HE-LTF symbols is m1 and m2 (access point and site pre-agreed). Or, it is indicated by only one unused combination that the current frame contains an additional HE-LTF, or the current frame is NDP, and then the MCS field is reused to indicate the number of additional HE-LTF symbols.
  • the receiving end After the receiving end reads the HE-SIG of the above structure, it knows that the current frame is a special frame (including an additional HE-LTF, or the current frame is NDP) through the reused field or an additional indication. Then, through the reused domain, the number of additional HE-LTF symbols included in the current frame is known. Combined with the number of HE-LTF symbols, the number of total HE-LTF symbols included in the current frame can be known, and thus the current number can be known. The end position of the frame. The number of HE-LTF symbols is determined by the spatial stream indicated by Nsts in HE-SIGA.
  • the second method of indicating the number of additional HE-LTF symbols is to add an extra 1 bit in the Nsts field of HE-SIGA to indicate the situation of more spatial streams.
  • the current Nsts contains only 3 bits, supporting the indication to a maximum of 8 spatial streams.
  • the 4-bit Nsts can indicate up to 16 spatial streams.
  • the spatial stream corresponds to the number of HE-LTF symbols
  • the expanded Nsts field corresponds to the sum of the number of HE-LTF symbols and the number of additional HE-LTF symbols.
  • additional bits may be added to the HE-SIG, or partial fields of the HE-SIG, such as the PE domain and the MCS domain, may be reused to carry the number of additional HE-LTF symbols.
  • NDP different numbers of different HE-LTF symbols (access point and site pre-agreed) are agreed for different numbers of HE-LTF symbols, for example, the number of HE-LTF symbols is 4, There are 2 additional HE-LTF symbols in the convention; if there are 8 HE-LTF symbols, there are 4 additional HE-LTFs.
  • partial fields of the HE-SIG such as the PE domain and the MCS domain, may also be reused to carry an indication of the number of spatial streams or their own HE-LTF symbols.
  • the receiving end After the receiving end reads the HE-SIGA of the above structure, it can learn that the current NDP is obtained by calculating the OFDM symbol of the data part, and then indicate the number of additional HE-LTF symbols by the indication of the reused domain or the predetermined number of additional HE-LTF symbols. Subtract the extra HE-LTF from the number of HE-LTF symbols The number of symbols can be obtained by the number of HE-LTF symbols. The indication from Nsts can know the current total number of HE-LTF symbols, and thus the end position of the current frame.
  • the embodiment of the present invention generates a null data packet NDP, where the null data packet includes an HE-LTF and a packet extension field for the target STA to perform channel estimation, or the null data packet is included for the target STA to perform.
  • the HE-LTF of the channel estimation and the additional HE-LTF can avoid the waste of resources caused by the partial feedback not supporting the immediate feedback, thereby improving the transmission efficiency of the channel state information.
  • FIG. 5 is a schematic block diagram of an apparatus for transmitting a channel state message in a wireless local area network according to Embodiment 2 of the present invention.
  • the data transmission device is, for example, a site or a dedicated circuit or chip that implements related functions.
  • the site 1000 includes a processor 1010, a memory 1020, a baseband circuit 1030, a radio frequency circuit 1040, and an antenna 1050.
  • the means for transmitting the trigger frame may be the AP or STA1-STA3 shown in FIG. 1.
  • the processor 1010 controls the operation of the site 1000.
  • the memory 1020 can include read only memory and random access memory and provides instructions and data to the processor 1010, which can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic. Device. A portion of memory 1020 may also include non-volatile line random access memory (NVRAM).
  • the baseband circuit 1030 is used to synthesize the baseband signal to be transmitted or to decode the received baseband signal.
  • the radio frequency circuit 1040 is for modulating a low frequency baseband signal to a high frequency carrier signal, and a high frequency carrier signal is transmitted through the antenna 1050.
  • the radio frequency circuit is also used to demodulate the high frequency signal received by the antenna 1050 into a low frequency carrier signal.
  • the various components of station 1000 are coupled together by a bus 1060, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 1060 in the figure. It should be noted that the above description of the site structure can be applied to the subsequent embodiments.
  • the baseband circuit 1030 generates a null data packet NDP, where the null data packet includes a high efficiency long training sequence HE-LTF and a padding field, and the padding field is used to allow the target station to have extra time.
  • the RF circuit 1040 is configured to send the null data packet.
  • the padding field includes a packet extension field or an additional HE-LTF.
  • the length of the packet extension field or the number of additional HE-LTF symbols is determined by at least one of the following conditions: bandwidth, mode of the HE-LTF, and estimated number of spatial streams.
  • the length of the packet extension field or the number of additional HE-LTF symbols may be determined by negotiation between sites, or may be defined by a standard.
  • the null data packet includes an indication field, where the indication field is located in an efficient signaling field HE-SIG of the null data packet, where the indication field is used to define packet extension field information and additional HE-LTF information. .
  • the packet extension field information includes: a length of the packet extension field, or whether the packet extension field is greater than 16 us.
  • the additional HE-LTF information includes: the number of additional HE-LTF symbols, or whether there is an additional HE-LTF.
  • the P matrix of the HE-LTF in the null data packet is selected according to the sum of the additional HE-LTF and the self-contained HE-LTF.
  • the additional HE-LTF in the null data packet is the same as the self-contained HE-LTF portion.
  • the additional HE-LTF in the null data packet is all the same as the own HE-LTF.
  • the method for indicating the packet extension field information and the additional HE-LTF information includes at least one of the following: an extra bit in the HE-SIG, reusing the modulation coding set MCS in the HE-SIG, and reusing the HE-
  • the packet in the SIG extends the PE domain.
  • Embodiments of the present invention generate an empty data packet NDP, where the null data packet is included for Let the target STA perform the HE-LTF and the packet extension field of the channel estimation, or the null data packet includes the HE-LTF and the additional HE-LTF for the target STA to perform channel estimation, so as to avoid partial sites not supporting The waste of resources caused by immediate feedback can improve the transmission efficiency of channel state information.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the technical solution of the present invention which is essential or contributes to the prior art, can be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • a hard disk or optical disk, etc. includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

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

Abstract

La présente invention concerne un procédé et un dispositif permettant de transmettre des informations d'état de canal, le procédé consistant à : générer un paquet de données vides (NDP), ledit paquet de données vides disposant d'un long champ d'entraînement à haute efficacité (HE-LTF) et d'un champ d'expansion de paquet permettant d'amener une STA cible à effectuer une estimation de canal, ou ledit paquet de données vides disposant d'un HE-LTF et d'un HE-LTF supplémentaire permettant d'amener la STA cible à effectuer une estimation de canal. L'application du procédé et du dispositif ci-dessus peut éviter le gaspillage de ressources provoqué lorsqu'une partie des stations ne prennent pas en charge une rétroaction instantanée, ce qui permet d'améliorer l'efficacité de transmission des informations d'état de canal.
PCT/CN2016/090777 2015-09-10 2016-07-20 Procédé et dispositif de transmission d'informations d'état de canal Ceased WO2017041590A1 (fr)

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