Information sending method, receiving method and device

Abstract

The present application discloses an information sending method, receiving method, and apparatus for enabling a terminal device to provide some new feedback information to a network device. The method comprises: the network device sends feedback information configuration information to the terminal device, wherein the feedback information configuration information instructs the terminal device to feedback the Doppler frequency deviation of the wireless channel, the time delay of the wireless channel, or the strength of the wireless time domain channel, etc.; the terminal device receives the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the time delay of the wireless channel, or the indication information of the strength of the wireless time domain channel, etc. from the terminal device. The method enables the network device to utilize the correlation or reciprocity between the uplink channel and the wireless channel, in combination with the Doppler frequency deviation of the wireless channel, the time delay of the wireless channel, or the strength of the wireless time domain channel, etc. to perform uplink channel estimation, thereby improving the technical problem in the prior art that the uplink channel estimation performance is limited by the maximum uplink pilot density.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 24, 2019, with application number PCT / CN2019 / 128088 and application name “A Method for Sending, Receiving and Apparatus for Information,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to an information sending method, receiving method and device. Background Art

[0004] When performing channel state information (CSI) measurement and data demodulation, the base station needs to estimate the current channel based on the uplink pilot, that is, perform uplink channel estimation.

[0005] The performance of uplink channel estimation is closely related to the uplink pilot transmission period and the time-frequency density of the uplink pilots. A higher time-frequency density of the uplink pilots results in better uplink channel estimation performance. However, a higher time-frequency density means higher pilot overhead. Since uplink transmission time slots are limited, a higher uplink pilot overhead can affect throughput and reduce uplink transmission performance. However, a lower time-frequency density can make it difficult to accurately estimate uplink channel information.

[0006] It can be seen that in the prior art, the terminal device only provides uplink pilots to the base station for uplink channel estimation, so that the uplink channel estimation performance is limited by the maximum uplink pilot density, and it is impossible to take into account both the uplink channel estimation performance and the uplink pilot overhead. Summary of the Invention

[0007] The present application provides an information sending method, a receiving method, and an apparatus for providing new feedback information to a network device to assist the network device in performing better uplink channel estimation.

[0008] In the first aspect, an embodiment of the present application provides an information receiving method, which can be applied to a network device, including: sending configuration information of feedback information to a terminal device, wherein the configuration information of the feedback information indicates that the terminal device feeds back one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel; and receiving one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel from the terminal device.

[0009] In an embodiment of the present application, a network device may send configuration information of feedback information to a terminal device to instruct the terminal device to feed back one or more of the Doppler frequency deviation of a wireless channel, the time delay of a wireless channel, or the strength of a wireless time domain channel. After receiving the configuration information of the feedback information, the terminal device may feed back one or more of the indication information of the Doppler frequency deviation of a wireless channel, the indication information of the time delay of a wireless channel, or the indication information of the strength of a wireless time domain channel to the network device. Compared with the prior art, the terminal device may provide one or more of the indication information of the Doppler frequency deviation, the indication information of the time delay of a wireless channel, or the indication information of the strength of a wireless time domain channel to the network device. In this way, the network device may utilize the correlation or reciprocity between the uplink channel and the wireless channel, and combine one or more of the indication information of the Doppler frequency deviation of a wireless channel, the indication information of the time delay of a wireless channel, or the indication information of the strength of a wireless time domain channel to perform uplink channel estimation, thereby improving the technical problem in the prior art that the uplink channel estimation performance is limited by the maximum uplink pilot density.

[0010] In one possible design, the network device may perform uplink channel estimation based on a pilot signal and one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel.

[0011] In this embodiment, the network device performs uplink channel estimation based on the pilot signal and in combination with one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel. This can improve the upper limit of the channel estimation performance under a given pilot density, or reduce the pilot overhead while ensuring a certain channel estimation performance. In addition, it can also well match dynamic channel estimation requirements to achieve the purpose of improving uplink coverage and uplink capacity.

[0012] In one possible design, the configuration information of the feedback information may be downlink CSI configuration information.

[0013] In this way, one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel or the indication information of the strength of the wireless time domain channel can be carried through the downlink CSI, without the need for additional signaling to carry the indication information separately, which can save system overhead.

[0014] In one possible design, the configuration information of the feedback information can also be carried in radio resource control RRC signaling or media access control MAC signaling.

[0015] In this way, the terminal device can be directly instructed to feed back one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel or the strength of the wireless time domain channel without changing the original signaling configuration.

[0016] In one possible design, the Doppler frequency deviation of the wireless channel may include: the Doppler frequency deviation of each path of the wireless channel, the maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the wireless channel, or the average Doppler frequency deviation of all paths of the wireless channel, etc. One or more items.

[0017] This embodiment provides multiple specific feedback forms of Doppler frequency offset, which can improve the flexibility of the solution.

[0018] In one possible design, the delay of the wireless channel may include: the delay of each path of the wireless channel, the maximum delay among the delays of all paths of the wireless channel or the average delay of all paths of the wireless channel, the delay of other paths of the wireless channel except the first path, or the delay of other paths of the wireless channel except the first path relative to the first path, etc., one or more of the following.

[0019] This embodiment provides multiple specific feedback forms of the wireless channel delay, which can improve the flexibility of the solution.

[0020] In one possible design, the strength of the wireless time domain channel may include: the strength of each path of the wireless channel, the square of the strength of each path of the wireless channel, the strength or the square of the strength of other paths of the wireless channel except the first path, or one or more of the strengths of other paths of the wireless channel except the first path relative to the first path.

[0021] This embodiment provides multiple specific feedback forms of the strength of the wireless time domain channel, which can improve the flexibility of the solution.

[0022] In one possible design, the configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information further instructs the terminal device to feed back the wireless channel delay and / or the strength of the wireless time domain channel of the channel measurement signal port included in the channel measurement signal resource. Accordingly, after sending the configuration information of the feedback information to the terminal device, the network device receives the wireless channel delay and / or the strength of the wireless time domain channel under all or part of the channel measurement signal ports fed back from the terminal device.

[0023] This embodiment provides a more specific feedback form of the wireless channel delay and the strength of the wireless time domain channel, which can improve the flexibility of the solution.

[0024] In one possible design, the channel measurement signal is a channel state information reference signal CSI-RS.

[0025] In one possible design, the configuration information for the feedback information may further indicate the number of paths of the wireless channel fed back by the terminal device. Accordingly, after sending the configuration information for the feedback information to the terminal device, the network device may further receive from the terminal device information indicating the number of paths of the wireless channel, the delay spread of the wireless channel, the Doppler spread of the wireless channel, and the angle of arrival and / or angle of departure of each path of the wireless channel.

[0026] In this implementation, the terminal device provides more feedback information that helps the network device perform uplink channel estimation, which can further improve the flexibility and accuracy of the network device in performing uplink channel estimation.

[0027] In one possible design, the network device performs uplink channel estimation based on the pilot signal and one or more of the Doppler frequency shift of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel. Specific methods include but are not limited to the following two:

[0028] Method 1: The network device first performs channel estimation based on the pilot signal to generate a first channel estimation result; then corrects the first channel estimation result based on the Doppler frequency offset of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel to obtain a second channel estimation result as the result of the uplink channel estimation.

[0029] Method 2: The network device first estimates the autocorrelation matrix R of the uplink channel H based on one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel. HH ; Then the autocorrelation matrix R of the uplink channel H HH Bring in the minimum mean square error MMSE algorithm to derive and solve the uplink channel H to obtain the estimated result H of the uplink channel H mmse .

[0030] This embodiment provides two methods for uplink channel estimation that combine pilot signals, the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, and the strength of the wireless time domain channel. Both methods can improve the upper limit of channel estimation performance under a given pilot density, or reduce pilot overhead while ensuring a certain channel estimation performance, thereby improving the flexibility of the solution.

[0031] In the second aspect, an embodiment of the present application provides an information sending method that can be applied to a terminal device, the method comprising: receiving configuration information of feedback information from a network device, the configuration information of the feedback information indicating that the terminal device feeds back one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel; and sending one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel to the network device.

[0032] In one possible design, the configuration information of the feedback information may be downlink CSI configuration information, and one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel may be carried through the downlink CSI.

[0033] In one possible design, the configuration information of the feedback information can be carried in radio resource control RRC signaling or media access control MAC signaling.

[0034] In one possible design, the Doppler frequency deviation of the wireless channel may include one or more of the Doppler frequency deviation of each path of the wireless channel, the maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the wireless channel; or the average Doppler frequency deviation of all paths of the wireless channel.

[0035] In one possible design, the delay of the wireless channel may include one or more of the delay of each path of the wireless channel, the maximum delay among the delays of all paths of the wireless channel, the average delay of all paths of the wireless channel, the delay of other paths in the wireless channel except the first path, or the delay of other paths of the wireless channel except the first path relative to the first path.

[0036] In one possible design, the configuration information of the feedback information also indicates the number of paths of the wireless channel fed back by the terminal device; after receiving the configuration information of the feedback information from the network device, the terminal device can also send indication information of the number of paths of the wireless channel to the network device.

[0037] In one possible design, the configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information further instructs the terminal device to feed back the wireless channel delay and / or the strength of the wireless time domain channel of the channel measurement signal port included in the channel measurement signal resource. After receiving the configuration information of the feedback information from the network device, the terminal device also sends the wireless channel delay and / or the strength of the wireless time domain channel of all or part of the channel measurement signal ports to the network device.

[0038] In one possible design, the channel measurement signal is a channel state information reference signal CSI-RS.

[0039] In the third aspect, an embodiment of the present application provides an information receiving device, which can be a network device or a device in a network device, and the device includes: a sending unit, used to send configuration information of feedback information to a terminal device, wherein the configuration information of the feedback information indicates that the terminal device feeds back one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel; and a receiving unit, used to receive one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel from the terminal device.

[0040] In one possible design, the configuration information of the feedback information may be downlink CSI configuration information, and one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel may be carried through the downlink CSI.

[0041] In one possible design, the configuration information of the feedback information can be carried in radio resource control RRC signaling or media access control MAC signaling.

[0042] In one possible design, the Doppler frequency deviation of the wireless channel may include one or more of the Doppler frequency deviation of each path of the wireless channel, the maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the wireless channel, or the average Doppler frequency deviation of all paths of the wireless channel.

[0043] In one possible design, the delay of the wireless channel may include: the delay of each path of the wireless channel, the maximum delay among the delays of all paths of the wireless channel, the average delay of all paths of the wireless channel, the delay of other paths of the wireless channel except the first path, or the delay of other paths of the wireless channel except the first path relative to the first path, etc., one or more of the following.

[0044] In one possible design, the strength of the wireless time domain channel may include one or more of: the strength of each path of the wireless channel, the square of the strength of each path of the wireless channel, the strength or the square of the strength of other paths of the wireless channel except the first path, or the strength of other paths of the wireless channel except the first path relative to the first path.

[0045] In one possible design, the configuration information of the feedback information may also indicate the number of paths of the wireless channel fed back by the terminal device; the receiving unit may also be used to receive indication information of the number of paths of the wireless channel from the terminal device.

[0046] In one possible design, the configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information also indicates that the terminal device feeds back the wireless channel delay and / or the strength of the wireless time domain channel of the channel measurement signal port included in the channel measurement signal resource; the receiving unit is also used to: receive the wireless channel delay and / or the strength of the wireless time domain channel under all or part of the channel measurement signal ports fed back from the terminal device.

[0047] In one possible design, the channel measurement signal is a channel state information reference signal CSI-RS.

[0048] In one possible design, the device may also include: a processing unit for performing uplink channel estimation based on a pilot signal and one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel.

[0049] In one possible design, the processing unit is specifically used to: perform channel estimation based on the pilot signal to generate a first channel estimation result; correct the first channel estimation result based on one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel, to obtain a second channel estimation result as the result of the uplink channel estimation.

[0050] In one possible design, the processing unit is specifically configured to estimate the autocorrelation matrix R of the uplink channel H based on one or more of the Doppler frequency deviation of the wireless channel, the time delay of the wireless channel, or the strength of the wireless time domain channel. HH ; The autocorrelation matrix R of the uplink channel H HH Bring in the minimum mean square error MMSE algorithm to derive and solve the uplink channel H to obtain the estimated result H of the uplink channel H mmse .

[0051] In a fourth aspect, an embodiment of the present application provides an information sending device, which can be a terminal device or a device in a terminal device, and the device includes: a receiving unit for receiving configuration information of feedback information from a network device, wherein the configuration information of the feedback information indicates that the terminal device feeds back one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel; and a sending unit for sending one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel to the network device.

[0052] In one possible design, the configuration information of the feedback information may be downlink CSI configuration information, and one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel may be carried through the downlink CSI.

[0053] In one possible design, the configuration information of the feedback information can be carried in radio resource control RRC signaling or media access control MAC signaling.

[0054] In one possible design, the Doppler frequency deviation of the wireless channel may include one or more of the Doppler frequency deviation of each path of the wireless channel, the maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the wireless channel, or the average Doppler frequency deviation of all paths of the wireless channel.

[0055] In one possible design, the delay of the wireless channel may include one or more of the delay of each path of the wireless channel, the maximum delay among the delays of all paths of the wireless channel, the average delay of all paths of the wireless channel, the delay of other paths of the wireless channel except the first path, or the delay of other paths of the wireless channel except the first path relative to the first path.

[0056] In one possible design, the strength of the wireless time domain channel may include one or more of the strength of each path of the wireless channel, the square of the strength of each path of the wireless channel, the strength or the square of the strength of other paths of the wireless channel except the first path, or the strength of other paths of the wireless channel except the first path relative to the first path.

[0057] In one possible design, the configuration information of the feedback information may also indicate the number of paths of the wireless channel fed back by the terminal device; the sending unit may also be used to: send indication information of the number of paths of the wireless channel to the network device.

[0058] In one possible design, the configuration information of the feedback information may also indicate the number of paths of the wireless channel fed back by the terminal device; the sending unit may also be used to: send indication information of the number of paths of the wireless channel to the network device.

[0059] In one possible design, the configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information also indicates that the terminal device feeds back the wireless channel delay and / or the strength of the wireless time domain channel of the channel measurement signal port contained in the channel measurement signal resource; the sending unit is also used to: send the wireless channel delay and / or the strength of the wireless time domain channel of all or part of the channel measurement signal ports to the network device.

[0060] In one possible design, the channel measurement signal is a channel state information reference signal CSI-RS.

[0061] In a fifth aspect, an embodiment of the present application provides an information receiving device, which may be a network device or a device in a network device, and the device includes: a memory for storing a computer program; a processor for executing the computer program stored in the memory, so that the device performs the method described in the first aspect of the embodiment of the present application or any possible design of the first aspect.

[0062] In the sixth aspect, an embodiment of the present application provides an information receiving device, which can be a terminal device or a device in a terminal device, and the device includes: a memory for storing a computer program; a processor for executing the computer program stored in the memory, so that the device performs the method described in the second aspect of the embodiment of the present application or any possible design of the second aspect.

[0063] In a seventh aspect, an embodiment of the present application provides an information receiving device, which may be a network device or a device in a network device, and the device includes a processor and a transceiver. The processor is configured to support the device to perform the corresponding functions of the network device in the method described in the first aspect of the embodiment of the present application or any possible design of the first aspect. The transceiver is used to support communication between the network device and other devices (such as terminal devices). The transceiver may be an independent receiver, an independent transmitter, a transceiver with integrated transceiver functions, or an interface circuit.

[0064] In an eighth aspect, an embodiment of the present application provides an information sending device, which may be a terminal device or a device in a terminal device, and the device includes a processor and a transceiver. The processor is configured to support the device to perform the corresponding functions of the terminal device in the method described in the second aspect of the embodiment of the present application or any possible design of the second aspect. The transceiver is used to support communication between the terminal device and other devices (such as network devices). The transceiver may be an independent receiver, an independent transmitter, a transceiver with integrated transceiver functions, or an interface circuit.

[0065] In the ninth aspect, an embodiment of the present application provides a computer-readable storage medium, including a program or instruction, which, when run on a computer, executes the method described in the first aspect of the embodiment of the present application or any possible design of the first aspect.

[0066] In the tenth aspect, an embodiment of the present application provides a computer-readable storage medium, including a program or instruction, which, when run on a computer, executes the method described in the second aspect of the embodiment of the present application or any possible design of the second aspect.

[0067] In the eleventh aspect, an embodiment of the present application provides a chip, which is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method described in the first aspect of the embodiment of the present application or any possible design of the first aspect.

[0068] In the twelfth aspect, an embodiment of the present application provides a chip, which is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method described in the second aspect of the embodiment of the present application or any possible design of the second aspect.

[0069] In a thirteenth aspect, an embodiment of the present invention provides a wireless communication system, which includes the network equipment and terminal equipment involved in the above aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 Schematic diagram of the DMRS transmission process;

[0071] Figure 2 A schematic diagram of a network architecture of a communication system provided in an embodiment of the present application;

[0072] Figure 3 A flowchart of an information transmission method provided in an embodiment of the present application;

[0073] Figure 4 A flowchart of a data demodulation method provided in an embodiment of the present application;

[0074] Figure 5 A flow chart of a signal measurement method provided in an embodiment of the present application;

[0075] Figure 6 A schematic diagram of the structure of an information receiving device provided in an embodiment of the present application;

[0076] Figure 7 A schematic diagram of the structure of an information sending device provided in an embodiment of the present application;

[0077] Figure 8 A schematic structural diagram of another information receiving device provided in an embodiment of the present application;

[0078] Figure 9 A schematic diagram of the structure of another information sending device provided in an embodiment of the present application;

[0079] Figure 10A schematic structural diagram of another information receiving device provided in an embodiment of the present application;

[0080] Figure 11 A schematic structural diagram of another information sending device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0081] In wireless communication systems, communications can be categorized into different types based on the types of sending and receiving nodes. Typically, information sent from a network device to a terminal device is called downlink (DL) communication, while information sent from a terminal device to a network device is called uplink (UL) communication.

[0082] In downlink communications, when a base station, as a network device, allocates time-frequency resources to a terminal device, it needs to measure channel state information (CSI) to match changes in channel and interference information between the base station and the terminal device. This measurement primarily includes the rank indicator (RI), precoding matrix indicator (PMI), and channel quality indicator (CQI). During CSI measurement, the terminal device measures the current channel quality based on a reference signal (RS) sent by the base station and then feeds the measurement results back to the base station.

[0083] In the fourth generation (4G) wireless communication system, terminal devices can perform channel measurement through the cell-specific reference signal (CRS) and the channel state information reference signal (CSI-RS). In the fifth generation (5G) wireless communication system - the new radio access technology (NR) system, terminal devices can perform CSI measurement through the channel state information reference signal (CSI-RS). In addition, in NR, terminal devices can also measure channel state information through synchronization signals / broadcast channel resource blocks (SS / PBCH blocks, SSBs), tracking reference signals, etc., such as measuring channel multipath delay, delay spread, Doppler frequency deviation and other parameters.

[0084] In LTE and NR uplink transmission, a demodulation reference signal (DMRS) and a sounding reference signal (SRS) are defined. The SRS signal is used for CSI measurement, and the DMRS is used for physical uplink shared channel (PUSCH) data demodulation. When performing CSI measurement and data demodulation, it is necessary to first estimate the current channel based on the uplink pilot, that is, to perform channel estimation. For the sake of convenience, the uplink pilot can also be called the pilot. In the following description of this article, unless otherwise specified, the pilot refers to the uplink pilot.

[0085] In related technologies, the base station performs channel estimation based on the uplink pilot signal. Taking uplink DMRS transmission as an example, see Figure 1 , the DMRS transmission process includes:

[0086] S101. The base station configures the time-frequency position of the DMRS through RRC signaling, such as the number of symbols and symbol positions, frequency domain density, etc. For details, see the DMRS-UplinkConfig configuration information defined in the 3GPP TS 38.331 protocol.

[0087] S102. When the terminal device has data to transmit, the base station schedules the uplink data. Specifically, it may instruct the terminal device about PUSCH transmission information through a downlink control indicator (DCI), where the PUSCH transmission information may include the time-frequency resource position of the scheduled physical resource block (PRB), modulation coding index (MCS), bandwidth indication, number of antenna ports, etc. For details, please refer to DCI format 0_0 and DCI format 0-1 defined in the 3GPP TS 38.212 protocol.

[0088] S103. The terminal device sends uplink data and DMRS according to the DMRS configuration information and PUSCH scheduling information.

[0089] S104. The base station receives the PUSCH data and DMRS sent by the terminal device, and performs channel estimation based on the PUSCH data and DMRS. This process is mainly divided into two steps: first, the base station estimates the channel at the pilot location based on the pilot in the DMRS; second, based on the channel information at the pilot location, the channel information at the PUSCH data location is further estimated. In the first step, the least square (LS) method or the minimum mean square error (MMSE) method can be used for estimation. In the second step, linear interpolation or other more complex methods can be used for estimation. Please see the embodiment for the specific algorithm flow. It should be noted that LS estimation is simple to implement and its performance is usually lower than MMSE. However, MMSE requires knowledge of channel statistical information and prior information.

[0090] S105: The base station compensates the channel according to the estimated channel at the PUSCH data position, adopts an equalization algorithm such as LS or MMSE to obtain equalized data, and then performs operations such as constellation decomposition and decoding.

[0091] Based on the above description, it can be seen that the existing technology relies solely on pilot signals when performing uplink channel estimation. The performance of uplink channel estimation is closely related to the pilot transmission period and the pilot time-frequency density. In order to ensure uplink channel estimation performance, it is necessary to select an appropriate SRS and DMRS time-frequency density configuration. For example, in the time domain, DMRS can be configured with one symbol or up to four symbols, and in the frequency domain, it also supports configurations with a density of 4RE / PRB and a density of 6RE / PRB. However, a larger time-frequency density means higher pilot overhead. Therefore, in uplink channel estimation, it is necessary to consider the channel estimation performance and pilot overhead.

[0092] If the maximum time-frequency density is used, the pilot overhead will be very large. For example, when DMRS is configured with 4 symbols, its overhead is 28.6%. For TDD systems, the uplink transmission time slots are inherently small. For example, when the downlink to uplink time slot ratio is 4:1, the uplink pilot overhead will seriously affect the throughput. If a smaller time-frequency density is used, it is impossible to accurately obtain channel information, such as frequency offset and time offset. In addition, the existing uplink channel estimation relies solely on pilot estimation, and its performance is limited by the pilot density configured at the current moment. In general, the uplink channel estimation methods in the prior art have the following main disadvantages:

[0093] 1) When increasing pilot density to improve channel estimation performance, pilot overhead will increase significantly. When pilot density is maximized, system performance may be limited by channel estimation accuracy, making it impossible to correctly demodulate data.

[0094] 2) During estimation, there is a lack of prior information about the channel, such as delay, angle, Doppler frequency offset, etc. Therefore, even when the pilot density is maximized, it may not be possible to obtain accurate uplink channel estimation results.

[0095] 3) When the pilot is sent non-periodically, it is impossible to estimate the statistical information of the channel, such as delay spread, angle spread, Doppler spread, etc.

[0096] 4) The configuration of SRS and DMRS mainly depends on radio resource control (RRC) signaling. The delay of changing the configuration is relatively long, usually on the order of tens of milliseconds, which cannot meet the dynamic channel estimation requirements.

[0097] In order to solve one or more of the above technical problems, the embodiments of the present application provide an information sending method, receiving method and device. It can be applied to various wireless communication systems, such as: the fourth generation (4G), 4G system including LTE system, world-wide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system, such as NR, and future communication systems, such as 6G system. Of course, the technical solution of the embodiment of the present application can also be applied to other communication systems, as long as the communication system has uplink and downlink communication links. For example, Figure 2 A schematic diagram of the network architecture of a communication system provided in an embodiment of the present application. The communication system includes a network device and a terminal device, wherein the network device can send downlink data to the terminal device, the terminal device can receive downlink data sent by the network device, and the terminal device can send uplink data to the network device, and the network device can receive uplink data sent by the terminal device.

[0098] In an embodiment of the present application, configuration information of feedback information can be sent to a terminal device through a network device to instruct the terminal device to feedback one or more of the Doppler frequency deviation of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel; after receiving the configuration information of the feedback information, the terminal device sends one or more of the indication information of the Doppler frequency deviation of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel to the network device.

[0099] In this way, network devices can leverage the correlation or reciprocity between the wireless channel and the downlink channel, combined with one or more of the wireless channel's Doppler frequency offset, the wireless channel's delay, or the strength of the wireless time-domain channel, to perform uplink channel estimation. This approach, while providing a given pilot density, can improve the upper limit of channel estimation performance. Furthermore, while maintaining a certain level of channel estimation performance, it can reduce pilot overhead. Furthermore, it can effectively meet dynamic channel estimation requirements. This solution simultaneously balances uplink channel estimation performance and uplink pilot overhead. With minimal pilot overhead, network devices can obtain more accurate uplink CSI measurement information and improve data demodulation accuracy, thereby improving uplink coverage and capacity. In the embodiments of the present application, the wireless channel may specifically be a downlink channel. Of course, the embodiments of the present application are not limited to downlink channels. For ease of description, the following description primarily uses downlink channels as an example.

[0100] Below, in conjunction with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. In order to make the embodiments of the present application clearer, some of the contents and concepts related to the embodiments of the present application are introduced here in a unified manner.

[0101] 1) Terminal devices, also known as terminals, are user-side entities used to receive or transmit signals, sending uplink signals to network devices or receiving downlink signals from network devices. These devices provide voice and / or data connectivity to users, such as handheld devices with wireless connectivity or processing devices connected to wireless modems. These devices can communicate with the core network via the radio access network (RAN), exchanging voice and / or data with the RAN. The terminal device may include user equipment (UE), V2X terminal device, wireless terminal device, mobile terminal device, device-to-device communication (D2D) terminal device, machine-to-machine / machine-type communications (M2M / MTC) terminal device, Internet of Things (IoT) terminal device, subscriber unit (SU), subscriber station (SSS), mobile station (MSS), remote station (RSS), access point (AP), remote terminal (RSS), access terminal (ASD), user terminal (UE), user agent (UA), or user device, etc. For example, it may include a mobile phone (also called a "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, or computer-built-in mobile device, etc. Examples include personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), and other devices. Also included are limited devices, such as those with low power consumption, limited storage capacity, or limited computing power. Examples include information sensing devices such as barcode scanners, radio frequency identification (RFID), sensors, global positioning systems (GPS), and laser scanners.

[0102] As an example and not a limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices or smart wearable devices, etc., which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, etc., as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets, smart helmets, and smart jewelry for vital sign monitoring.

[0103] The various terminal devices introduced above, if located on a vehicle (eg, placed in or installed in a vehicle), can be considered as vehicle-mounted terminal devices, which are also called on-board units (OBUs).

[0104] 2) Network equipment, used to receive uplink signals from terminal devices or send downlink signals to terminal devices. Examples include access network (AN) equipment and radio access network (RAN) equipment. Access network equipment, such as base stations (e.g., access points), may refer to equipment in an access network that communicates with wireless terminal devices over the air interface through one or more cells. The base station may be used to convert received air frames into and from Internet Protocol (IP) packets, acting as a router between the terminal device and the rest of the access network, which may include an IP network. The network equipment may also coordinate attribute management of the air interface. For example, the network device may include an evolved base station (NodeB or eNB or e-NodeB, evolved Node B) in a long term evolution (LTE) system or long term evolution-advanced (LTE-A), or may also include a next generation node B (next generation node B, gNB) or a next generation evolved node B (next generation evolved node B, ng-eNB), en-gNB (enhanced next generation node B, gNB) in a fifth generation mobile communication technology (5G) new radio (NR) system: an enhanced next generation base station; it may also include a centralized unit (CU) and a distributed unit (DU) in a cloud radio access network (Cloud RAN) system, or may also include a relay device, which is not limited in the embodiments of the present application.

[0105] In an embodiment of the present application, the network device may further include a core network device, which includes, for example, a network device that processes and forwards user signaling and data. In a 4G system, a core network device is, for example, a mobility management entity (MME). MME is a key control node of the access network of the LTE system defined by the 3rd Generation Partnership Project (3GPP) protocol. It is responsible for the positioning and paging process of terminal devices in idle mode, including relaying. Simply put, MME is a core network device responsible for the signaling processing part. Alternatively, in a 5G system, the core network device includes, for example, an access management network element, a session management network element, or a user plane gateway and other core network devices. The user plane gateway can be a server with functions such as mobility management, routing, and forwarding of user plane data, and is generally located on the network side, such as a serving gateway (SGW) or a packet data network gateway (PGW) or a user plane function entity (UPF).

[0106] 3) Doppler shift: The wavelength of electromagnetic radiation changes due to the relative motion of network equipment and terminal equipment, resulting in the observed frequency when receiving the signal being different from the actual signal transmission frequency. The frequency deviation caused by this phenomenon is called Doppler shift.

[0107] 4) Time delay: the time difference between the electromagnetic wave from the transmitter to the receiver.

[0108] 5) Delay spread: A physical quantity that describes the multipath effect in the time domain, defined as the difference between the maximum transmission delay and the minimum transmission delay.

[0109] 6) Doppler spread: This refers to the frequency range where the Doppler spectrum is not equal to zero. Assuming the carrier frequency is fc and the maximum Doppler shift is fd, the frequency range of Doppler spread is from fc-fd to fc+fd.

[0110] 7) Angle of arrival: refers to the angle at which the electromagnetic wave reaches the receiving antenna.

[0111] 8) Departure angle: refers to the angle at which the electromagnetic wave leaves the transmitting antenna.

[0112] 9) In the embodiments of this application, the terms "system" and "network" are used interchangeably. The term "plurality" refers to two or more. The term "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0113] 10) Downlink time domain channel strength: The attenuation coefficient of each path in the multipath channel that the electromagnetic wave travels from the transmitter to the receiver.

[0114] Optionally, the strength of the downlink time domain channel is specifically the amplitude of the downlink time domain channel.

[0115] 11) Multipath Channel: Wireless signals are reflected, refracted, and diffracted by obstacles, causing the receiver to receive signals from different propagation paths. A wireless channel with multiple propagation paths is called a multipath channel, and a wireless channel with a single propagation path is called a single path of the wireless channel.

[0116] 12) The first path of the downlink channel: the path with the smallest delay among the multiple paths of electromagnetic waves from the transmitter to the receiver.

[0117] See also Figure 3 , which is a flowchart of an information transmission method provided in an embodiment of the present application. In the following, the method is mainly applied to Figure 1 The wireless communication system shown in FIG.

[0118] S301. The network device sends configuration information of feedback information to the terminal device, wherein the configuration information of the feedback information instructs the terminal device to feed back downlink channel information (or feedback information), wherein the downlink channel information includes one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel.

[0119] Optionally, the delay is an absolute delay.

[0120] Optionally, the delay is a relative delay.

[0121] Optionally, the intensity is absolute intensity.

[0122] Optionally, the intensity is a relative intensity.

[0123] In some possible designs, the Doppler frequency deviation of the downlink channel may include one or more of the following items: (1) the Doppler frequency deviation of each path of the downlink channel; (2) the maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the downlink channel; (3) the average Doppler frequency deviation of all paths of the downlink channel.

[0124] In some possible designs, the delay of the downlink channel may include one or more of the following items: (1) the delay of each path of the downlink channel; (2) the maximum delay among the delays of all paths of the downlink channel; (3) the average delay of all paths of the downlink channel; (4) the delay of other paths except the first path; (5) the delay of other paths except the first path relative to the first path.

[0125] In one possible design, the strength of the downlink time domain channel may include one or more of the following items: (1) the strength of each path of the downlink channel; (2) the square of the strength of each path of the downlink channel; (3) the strength or the square of the strength of the other paths of the downlink channel except the first path; (4) the strength of the other paths of the downlink channel except the first path relative to the first path.

[0126] In some possible designs, the configuration information of the feedback information can not only instruct the terminal device to feedback one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel, but also instruct the terminal device to feedback other information related to the downlink channel. For example, it can also instruct the terminal device to feedback the number of downlink channel paths, the delay spread of the downlink channel, the Doppler spread of the downlink channel, the arrival angle and / or departure angle of each path of the downlink channel, the downlink channel delay of all or part of the downlink channel measurement signal ports and / or the strength of the downlink time domain channel, etc., which is feedback information that helps the network device to perform uplink channel estimation.

[0127] Optionally, the channel measurement signal is a CSI-RS.

[0128] S302. The terminal device receives the configuration information of the feedback information sent by the network device, and feeds back the downlink channel information to the network device, wherein the downlink channel information includes one or more of the indication information of the Doppler frequency deviation of the downlink channel, the indication information of the delay of the downlink channel, or the indication information of the strength of the downlink time domain channel.

[0129] It should be understood that before the terminal device sends one or more of the indication information of the Doppler frequency deviation of the downlink channel, the time delay of the downlink channel, or the strength of the downlink time domain channel, it needs to first obtain one or more of the Doppler frequency deviation of the downlink channel, the time delay of the downlink channel, or the strength of the downlink time domain channel. Therefore, before the terminal device feeds back one or more of the indication information of the Doppler frequency deviation of the downlink channel, the time delay of the downlink channel, or the strength of the downlink time domain channel, it can also send a reference signal to the terminal device so that the terminal device performs signal measurement based on the reference signal, and then obtains one or more of the Doppler frequency deviation of the downlink channel, the time delay of the downlink channel, or the strength of the downlink time domain channel.

[0130] In some possible designs, the reference signal may include a synchronization / broadcast channel resource block (SS / PBCH Block, SSB), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a cell reference signal (CRS), a tracking reference signal (TRS), etc., and the embodiments of the present application do not impose specific limitations.

[0131] In an embodiment of the present application, after receiving one or more of the indication information of the Doppler frequency deviation of the downlink channel, the indication information of the delay of the downlink channel, or the indication information of the strength of the downlink time domain channel, the network device can utilize the correlation or reciprocity between the uplink channel and the downlink channel to estimate the Doppler frequency deviation of the downlink channel as the Doppler frequency deviation of the uplink channel, estimate the delay of the downlink channel as the delay of the uplink channel, or estimate the strength of the downlink time domain channel multipath as the strength of the uplink channel multipath. Then, based on the uplink pilot, the uplink channel estimation is performed in combination with one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel. The upper limit of the channel estimation performance can be improved under a given pilot density, or the pilot overhead can be reduced while ensuring a certain channel estimation performance. This can solve the problems in the prior art where the uplink channel estimation performance is limited by the configured uplink pilot density and the pilot overhead is too large, thereby achieving the purpose of improving uplink coverage and capacity.

[0132] In some possible designs, one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel are used to perform uplink channel estimation.

[0133] In some possible designs, the terminal device can be configured to feedback one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel through the downlink CSI configuration information. That is, the configuration information of the feedback information can be included in the downlink CSI configuration information, and one or more of the indication information of the Doppler frequency deviation of the downlink channel, the indication information of the delay of the downlink channel, or the indication information of the strength of the downlink time domain channel is carried by the downlink CSI.

[0134] If the configuration information is downlink CSI configuration information, the configuration information of the feedback information is carried in radio resource control RRC signaling or media access control MAC signaling, that is, the downlink CSI configuration information is in the RRC signaling or media access control (MAC) signaling.

[0135] In other possible designs, the configuration information of the feedback information can also be other information, or one or more of the indication information of the Doppler frequency deviation of the downlink channel, the indication information of the time delay of the downlink channel, or the indication information of the strength of the downlink time domain channel can also be carried by other information. For example, it can also be carried by dedicated RRC signaling or MAC signaling (that is, the dedicated RRC signaling or MAC signaling only carries one or more configuration information for instructing the terminal device to feedback the Doppler frequency deviation of the downlink channel, the time delay of the downlink channel, or the strength of the downlink time domain channel). The embodiments of the present application are not specifically limited here.

[0136] In some possible designs, the indication information of the feedback information fed back by the terminal device may be a direct value, that is, the value directly indicates the feedback information that needs to be fed back by the terminal device, and may also be in the form of an index, which indirectly indicates the feedback information that needs to be fed back by the terminal device through the index. The embodiments of the present application do not impose specific restrictions on this. For example: the downlink channel information may carry the value of the Doppler frequency deviation of the downlink channel, the value of the time delay of the downlink channel, or the strength of the downlink time domain channel, etc., or the downlink channel information may carry an index value, which corresponds to the value of the Doppler frequency deviation of the downlink channel, the value of the time delay of the downlink channel, or the strength of the downlink time domain channel, etc. Of course, the above are just some examples. In specific implementations, the downlink channel information may also be other indication methods that carry one or more of the values ​​corresponding to the Doppler frequency deviation of the downlink channel, the value of the time delay of the downlink channel, or the strength of the downlink time domain channel.

[0137] Furthermore, when performing uplink channel estimation, the network device not only considers the uplink pilot but also combines the downlink channel information fed back by the terminal device (including one or more of Doppler frequency offset, downlink channel delay, or downlink time domain channel strength) to perform uplink channel estimation. Therefore, before performing uplink channel estimation, the network device sends an uplink pilot configuration to the terminal device. After receiving the uplink pilot configuration, the terminal device sends an uplink pilot based on the configuration. After receiving the uplink pilot, the network device combines the received downlink channel information to perform uplink channel estimation.

[0138] A possible uplink channel estimation method is: the network device first performs channel estimation based on the pilot signal to generate a first channel estimation result. The specific method can refer to the existing LS method or MMSE method for estimation; then, the network device corrects the first channel estimation result based on the downlink channel information (including one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel) to obtain a second channel estimation result, and outputs the second channel estimation result as the final estimation result.

[0139] Another possible uplink channel estimation method is: the network device first estimates the autocorrelation matrix R of the uplink channel H based on the downlink channel information (including one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel). HH ; Then the autocorrelation matrix R of the uplink channel H is HH Bring in the MMSE estimator to derive and solve the uplink channel H, and obtain the estimated result H of the uplink channel H mmse The specific implementation process of the above two methods will be introduced in detail with examples in the following text.

[0140] Several specific embodiments are given below to illustrate in detail the specific implementation of the configuration information and feedback information.

[0141] Example 1

[0142] (1) Feedback information configuration information

[0143] In order to enable the terminal device to measure CSI, the network device can configure the CSI-RS resource configuration information and CSI feedback information for CSI measurement through RRC. The RRC information elements (IE) involved include CSI measurement configuration information (CSI-MeasConfig), resource configuration of the reference signal for CSI measurement (CSI-ResourceConfig), CSI feedback configuration information (CSI-ReportConfig IE), etc. Among them, CSI-ReportConfigIE contains the CSI content that the terminal needs to feedback, such as CQI, PMI, RI, etc. In this embodiment, the configuration of the CSI-RS measurement may not be modified, but since new content needs to be fed back (such as the delay of the downlink channel, Doppler frequency deviation, the strength of the downlink time domain channel, etc.), a new indication can be added to the CSI-ReportConfig IE to indicate that new content needs to be fed back.

[0144] For example, configuration information of feedback information may be added to the CSI-ReportConfig IE, such as feedback channel delay enable configuration information (ReportChannelDelayEnable), feedback Doppler frequency offset enable configuration information (ReportDopplerFreqOffsetEnable), and feedback channel strength enable configuration information (ReportChannelAmplitudeEnable).

[0145] If the terminal is required to feedback channel delay information, set the value of "ReportChannelDelayEnable" to 1, such as "ReportChannelDelayEnable ENUMERATED{1}".

[0146] If the terminal is required to feedback the Doppler frequency shift, set the value of "ReportDopplerFreqOffsetEnable" to 1, for example, "ReportDopplerFreqOffsetEnable ENUMERATED{1}".

[0147] If the terminal is required to provide feedback on the time-domain multipath channel strength, set the value of "ReportChannelAmplitudeEnable" to 1, such as "ReportChannelDelayEnable ENUMERATED{1}".

[0148] If the values ​​of ReportChannelDelayEnable, ReportDopplerFreqOffsetEnable, and ReportChannelAmplitudeEnable are 0, or if ReportChannelDelayEnable, ReportDopplerFreqOffsetEnable, and ReportChannelAmplitudeEnable are not configured, the terminal device does not feedback information such as channel delay, Doppler frequency offset, and time domain channel strength by default.

[0149] Optionally, the feedback period configuration can comply with the configuration in the existing "CSI-ReportConfig", such as the period can be configured to 5ms, 10ms, 20ms, etc. In addition, a new field can be added to the CSI-ReportConfig parameter to separately indicate the period of channel information feedback, such as the new channel feedback period and offset (Channel-ReportPeriodicityAndOffset) field:

[0150]

[0151]

[0152] For example, when slots4 indicates that the period is configured as 4 slots, the time slot offset value fed back may be 0, 1, 2, or 3 slots.

[0153] Of course, in addition to periodic feedback, aperiodic feedback can also be configured in CSI-ReportConfig.

[0154] In addition, the configuration information may also configure the quantization bit length of the channel delay and Doppler frequency offset.

[0155] One possible design is to define additional configuration information for indicating the quantization bit length of channel delay, Doppler frequency offset, and time domain channel strength in the CSI-ReportConfig IE. Another possible design is to additionally indicate the quantization bit length value of channel delay, Doppler frequency offset, and time domain channel strength in the channel delay feedback configuration parameter "ReportChannelDelayConfig", the Doppler frequency offset feedback configuration parameter "ReportDopplerFreqOffsetConfig", and the ReportChannelAmplitudeConfig. The "ReportChannelDelayConfig" parameter includes the required channel path number "ChannelDelayPathNumber", the number of quantization bits for the channel delay "ChannelDelayQuantizationBitLength", and the number of quantization bits for the differential channel delay "ChannelDelayDifferenceQuantizationBitLength". The "ReportDopplerFreqOffsetConfig" parameter includes the number of quantization bits for the positive part of the Doppler frequency offset "IntegerPartQuantizationBitLength" and the number of quantization bits for the fractional part of the Doppler frequency offset "IntegerPartQuantizationBitLength". For example:

[0156]

[0157] In addition, the network terminal can also configure the CSI-RS resource index for channel measurement and the number of CSI-RS ports that need to feedback downlink channel information to the terminal device, for example, using "ReportChannelRSconfig".

[0158] If the number of CSI-RS ports requiring feedback channels is not configured, the terminal device can selectively feedback the downlink channel delay or strength of all or part of the CSI-RS ports.

[0159] If the number of CSI-RS ports for which feedback channels are required is configured, the terminal feeds back the downlink channel delay or strength of each port according to the configured number of ports.

[0160] Among them, "Csi-rsResourceIndex" is the resource index number of CSI-RS, and the index value is 1, 2, ..., M1; "feedbackCsi-rsPortNumber" is the number of CSI-RS ports for which channel information feedback is required, and the value is 1, 2, ..., M2.

[0161]

[0162] It should be understood that parameters related to the number of quantization bits are optional configurations, and if not configured, the default values ​​can be used.

[0163] The meanings of the parameters n1, K, K1, L1, and L2 are shown in Tables 2-1 and 2-2 below.

[0164] Optionally, if the quantization method for feedback information is not configured, the terminal device may default to not providing feedback.

[0165] It should be noted that the reference signal for measuring channel information is not limited to CSI-RS; SSB, DMRS, and other signals may also be used. The newly added feedback content is not limited to being indicated by the CSI-ReportConfig IE; it can also be indicated through a new higher-layer signaling, achieving similar functionality. Regarding the configuration of feedback information, in addition to RRC signaling, MAC signaling and other methods may also be used. This description will not be repeated in the following description.

[0166] (2) Specific content of feedback information (i.e., downlink channel information)

[0167] The specific content of the feedback information is shown in Table 2. It is assumed that the multipath delay of the channel is within the range of the cyclic prefix (CP). Assume that the duration of the CP is Tcp = Nc*Tc, where Tc is the time interval of the sampling points in each orthogonal frequency division multiplexing (OFDM) symbol, and Nc represents the number of sampling points contained in the CP. The CP length and Tc are known to both the network device and the terminal device through configuration, and the same value is used in both the network device and the terminal device. When feedback is given, the delay can be sorted from small to large, that is, τ1<τ2<…<τ n .

[0168] For example, when the CP length is 144 sampling points, K can be 8 bits, the indicated Nn is an integer between 0 and 255, and the maximum path number n can be 6 or other larger values.

[0169] Table 2-1

[0170]

[0171]

[0172] It should be noted that the delay, Doppler frequency deviation, and intensity can be fed back separately, or only one or more of the delay, Doppler frequency deviation, or intensity can be fed back. The specific parameter to be fed back depends on the specific content of the configuration information. In addition, the values ​​of K and L can be configured through RRC signaling, or the default number of bits can be used, which is not limited here. In different implementations, differential quantization can also be used to reduce the number of bits fed back. When the delays of the multipaths of the channel are not much different, the feedback overhead can be reduced. As shown in Table 2-2 below, the values ​​of K, K1, and L can be configured through RRC signaling, or the default number of bits can be used. It should be noted that when the delay difference of each path is fed back, the delay of the first path may not be fed back.

[0173] Table 2-2

[0174]

[0175] In practical applications, the Doppler offset may vary because each path in the downlink channel has different angles of arrival and departure. When the Doppler offset for each path is unavailable, the average Doppler offset of all paths can be used as an approximation. Tables 2-1 and 2-2 only provide examples of feedback based on the average Doppler offset, which reduces feedback overhead. However, feedback based on the Doppler offset for each path is not excluded. Feedback information can also include parameters such as delay spread and Doppler spread.

[0176] In different implementations, the relative values ​​of the multipath strengths may also be fed back, as shown in Table 2-3 below. It should be noted that when the relative strength of each path is fed back, the strength of the first path may not be fed back.

[0177] Table 2-3

[0178]

[0179] When feedback is required for channel information for multiple CSI-RS ports, the terminal device also needs to feedback the channel information for the corresponding CSI-RS ports, including channel delay and / or strength. This is equivalent to feedback for each port set, including a set of channel delay and / or strength information from Table 2-1, Table 2-2, or Table 2-3. A port set includes at least one port; if it includes multiple ports, it indicates that the channels on these ports are identical or similar, and repeated feedback is not required.

[0180] The above describes the specific process of the terminal device feeding back downlink channel information to the network device. The following describes the specific process of the network device performing uplink estimation based on the downlink channel information after receiving the downlink channel information fed back by the terminal device according to the above solution.

[0181] (3) Channel estimation algorithm implementation

[0182] Assume that the received signal model in the frequency domain is:

[0183] Y=HX+N (1)

[0184] Where X is the pilot signal vector, H is the fading channel matrix, N is the noise vector, and Y is the received signal vector. Y, X, and N are known, and H needs to be estimated.

[0185] Common pilot-based channel estimation algorithms include LS, MMSE, and maximum likelihood estimation. LS and MMSE are used as examples below.

[0186] A. The LS estimation criterion must satisfy the following formula:

[0187]

[0188] Among them H LS It is an estimate of the channel H. Through mathematical derivation, we can get H LS =X -1 Y or H LS =(X H X) -1 X H The detailed derivation process will not be described here, and reference may be made to existing technologies.

[0189] B. The criterion for MMSE channel estimation is:

[0190]

[0191] Among them H mmse It is an estimate of the channel H, which can be obtained by mathematical derivation:

[0192] H mmse＝ R HH (R HH +(XX H ) -1 σ 2 ) -1 H LS (4)

[0193] Among them, R HH =E(HH H ), is the channel autocorrelation matrix, σ 2is the variance of the noise. The detailed derivation process is not described here in detail, and can be referred to the existing technology.

[0194] The method for the network device to perform uplink channel estimation based on downlink channel information is as follows:

[0195] Step 1: First, use formula (2) to obtain the LS estimate of the channel matrix, that is, H LS .

[0196] Step 2: Through Fourier transform, the channel H can be expressed in the time domain as:

[0197]

[0198] Among them, f DFT (·) is the Fourier transform function, α n is the coefficient of the nth path, τ n is the time delay of the nth path, and δ(·) is the impulse function.

[0199] Step 3: Based on the downlink channel delay, downlink channel Doppler frequency offset, and downlink time domain channel strength fed back by the terminal device, the channel estimate is corrected using the LS criterion in combination with formula (5) to obtain the actual channel H as follows:

[0200]

[0201] Where N is the number of paths and P is the total power of the multipath signal.

[0202] Of course, in step 1 above, the MMSE criterion can also be used to obtain the MMSE estimation of the channel matrix. Correspondingly, in step 3, the MMSE criterion can be used to correct the channel estimation, and the actual channel H can be obtained as follows:

[0203]

[0204] In the specific implementation, an optional method is to use the α obtained by formula (6) or formula (7) n The channel estimation value is corrected by averaging the multipath strength information fed back by the terminal device.

[0205] Another optional method is to add the multipath strength information fed back by the terminal device to the constraint conditions of formula (5) or (6) as prior information. For example, when the terminal feeds back the modulus or square value of the multipath strength, the constraint α can be n The magnitude or square of the intensity.

[0206] Step 4: After obtaining the channel of the uplink pilot position according to step 3, the channel of the data position can be obtained through linear interpolation, Wiener filtering and other methods, and the existing algorithm can be directly used.

[0207] It should be understood that in the above formulas (6) and (7), the Doppler frequency offset for the downlink channel is optional. Because when the terminal device is moving at a low speed or is not moving, the Doppler frequency offset can be roughly estimated in the uplink and has little impact on the result, so the terminal device does not need to feedback Doppler frequency offset information. When the terminal device is moving at a high speed, due to the large number of downlink reference signals and the periodic transmission of reference signals, the Doppler frequency offset can be estimated more accurately, for example, through a dedicated time-frequency tracking reference signal (TRS).

[0208] When estimating the uplink channel, the Doppler frequency offset can be directly used as feedback from the downlink, or it can be calculated by averaging or other filtering methods based on the uplink estimation results. Because the arrival and departure angles of each path vary, the Doppler frequency offset may vary. If the Doppler frequency offset for each path is unavailable, the average Doppler frequency offset of all paths can be used as an approximation. Tables 2-1 and 2-2 only provide examples of feedback using the average Doppler frequency offset, which reduces feedback overhead. However, feedback of the Doppler frequency offset for each path is not excluded.

[0209] In this embodiment, when performing uplink channel estimation, a pilot signal is first used to perform channel estimation to generate a first channel estimation result. The first channel estimation result is then corrected based on downlink channel information (including one or more of the Doppler frequency offset of the downlink channel, the time delay of the downlink channel, or the strength of the downlink time domain channel) to obtain a final channel estimation result. By performing channel estimation based on the uplink pilot and combining it with the prior information of the downlink channel fed back by the terminal device (such as one or more of the Doppler frequency offset of the downlink channel, the time delay of the downlink channel, or the strength of the downlink time domain channel), the upper limit of the channel estimation performance can be improved under a given pilot density, or the pilot overhead can be reduced while ensuring a certain channel estimation performance. This allows for both uplink channel estimation performance and uplink pilot overhead to be taken into account, thereby achieving the effect of improving uplink coverage and uplink capacity.

[0210] Example 2

[0211] In Example 1, the terminal device needs to feedback the delay information of each channel. Considering that when the number of downlink channel paths is relatively large, the feedback overhead will be relatively large. In this Example 2, a downlink channel information feedback method with low feedback overhead is provided.

[0212] (1) Channel information feedback configuration

[0213] Similar to Example 1, new feedback information configuration content can be added to the CSI-ReportConfig IE, defined as feedback channel delay configuration information (ReportChannelDelayConfig) and feedback Doppler frequency offset configuration information (ReportDopplerFreqOffsetConfig). The ReportChannelDelayConfig parameter includes the maximum channel delay (MaxChannelDelay), the average delay (MeanDelay), and the number of delay quantization bits (DealyQuantizationBitLength). It should be understood that DealyQuantizationBitLength is an optional configuration. If not configured, the default quantization length is used.

[0214] Different from Example 1, this embodiment takes into account the feedback overhead issue and can instruct the terminal device to only feedback the maximum delay in the multipath and the average delay of the multipath channel. The RRC layer configuration parameters can be as follows:

[0215]

[0216] The meanings of K3, L1, and L2 are shown in Table 2-4 below.

[0217] (2) The specific content of the feedback information (i.e., downlink channel information) is shown in Table 2-3:

[0218] Table 2-4

[0219]

[0220] The calculation methods for the multipath average delay mentioned in Table 2-4 include but are not limited to the following:

[0221] Method 1:

[0222]

[0223] Method 2:

[0224]

[0225] in, α n is the fading coefficient of the nth path of the channel.

[0226] Method 3:

[0227]

[0228] (3) Channel estimation algorithm implementation

[0229] In the first embodiment, the MMSE estimation algorithm is mentioned, and the estimated channel expression is:

[0230] H mmse =R HH (R HH +(XX H ) -1 σ 2 ) -1 H LS (11)

[0231] Among them, R HH =E(HH H ), is the channel autocorrelation matrix, σ 2 is the variance of the noise. Here, since H is unknown, it is not easy to obtain the autocorrelation matrix. In this embodiment, the following can be obtained by an approximate method:

[0232]

[0233] Where L is the maximum duration of multipath, τ mean is the average multipath delay, R HH The number of rows and columns are m, k, r respectively m,k R HH Every element in the matrix.

[0234] According to formula (12), the delay information fed back by the terminal device can be directly used to estimate R HH .

[0235] In addition, the purpose of the Doppler frequency offset fed back by the terminal device in this embodiment 2 is the same as that in embodiment 1 and will not be repeated here.

[0236] In this embodiment, when performing uplink channel estimation, the autocorrelation matrix of the uplink channel is estimated based on downlink channel information (including Doppler frequency offset and / or time delay). This autocorrelation matrix is ​​then directly introduced into the MMSE algorithm to derive and solve the uplink channel H, thereby obtaining an uplink channel estimation result. By performing channel estimation based on the uplink pilot and combining it with prior information of the downlink channel fed back by the terminal device (such as the downlink channel time delay and / or the downlink channel Doppler frequency offset), the upper limit of channel estimation performance can be increased at a given pilot density, or pilot overhead can be reduced while ensuring a certain channel estimation performance. This balances uplink channel estimation performance and uplink pilot overhead, thereby achieving the effect of improving uplink coverage and uplink capacity.

[0237] The above two embodiments introduce the specific method of the terminal device feeding back downlink channel information (such as the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel, etc.), and performing uplink channel estimation in combination with the uplink pilot and downlink channel information. Below, the specific implementation process of the above-mentioned information transmission and channel estimation scheme in the embodiment of the present application is introduced when applied to the PUSCH data demodulation scenario and the CSI measurement scenario respectively.

[0238] Example 3

[0239] See also Figure 4 , the embodiment of the present application also provides a data demodulation method. The detailed steps of the method are as follows:

[0240] S401: The network device configures the time-frequency position of the uplink pilot in the DMRS through RRC signaling, and configures CSI-RS resource configuration information and CSI feedback information for CSI measurement.

[0241] The network device configures the time-frequency position of the uplink pilot in the DMRS, including the number of uplink pilot symbols, symbol position, frequency domain density, etc. For details, see the DMRS-UplinkConfig configuration information defined in the 3GPP TS 38.331 protocol.

[0242] Among them, the CSI-RS resource configuration information configured by the network device for CSI measurement and the RRC information units involved in the CSI feedback information may include CSI-MeasConfig, CSI-ResourceConfig, CSI-ReportConfig IE, etc. The CSI-ReportConfig IE contains the CSI content that the terminal device needs to feedback, such as CQI, PMI, RI, etc. In the application embodiment, the configuration of the CSI-RS measurement may not be modified, but a new indication may be added to the CSI-ReportConfig IE to indicate that the terminal device needs to feedback new content (such as the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel, etc.). The specific implementation method of this part of the content can be found in the content of part (1) in the above-mentioned embodiment 1 or embodiment 2, which will not be repeated here.

[0243] S402: When the terminal device has data to transmit, the network device sends scheduling information of PUSCH data to the terminal device to schedule uplink data.

[0244] Specifically, DCI can be used to indicate to the terminal device information about PUSCH transmission, including the time-frequency resource location of the scheduled PRB, the modulation coding index (MCS), bandwidth indication, the number of antenna ports, etc. For details, please refer to DCI format 0_0 and DCI format 0-1 defined in the 3GPP TS 38.212 protocol.

[0245] S403: The network device sends a CSI-RS to the terminal device.

[0246] S404. The terminal device receives the CSI-RS sent by the network device, measures downlink channel information based on the CSI-RS, including one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel, and then feeds the measured downlink channel information back to the network device. The content of the downlink channel information fed back by the terminal device can be found in section (2) of the above-mentioned embodiment 1 or embodiment 2, and will not be repeated here.

[0247] S405. The terminal device sends PUSCH data and DMRS data according to the DMRS configuration information and the scheduling information of the PUSCH data.

[0248] S406. The network device receives the DMRS, PUSCH and downlink channel information sent by the terminal device, and then performs uplink channel estimation based on one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel or the strength of the downlink time domain channel in the pilot in the DMRS and the downlink channel information.

[0249] The specific countermeasures for the uplink channel estimation performed by the network device here can be found in part (3) of the above-mentioned embodiment 1 or embodiment 2, which will not be repeated here.

[0250] S407: The network device compensates the channel according to the estimated channel at the PUSCH data position, adopts an equalization algorithm such as LS or MMSE to obtain equalized data, and then performs operations such as constellation decomposition and decoding.

[0251] In this embodiment, when the network device performs PUSCH channel estimation, it combines the uplink pilot with a priori channel information fed back by the terminal device (such as the Doppler frequency offset of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel). This can improve the upper limit of channel estimation performance under a given pilot density, or reduce pilot overhead while ensuring a certain channel estimation performance. This can simultaneously balance uplink channel estimation performance and uplink pilot overhead. This improves the accuracy of data demodulation while minimizing pilot overhead, thereby achieving the goal of improving uplink coverage and uplink capacity.

[0252] Example 4

[0253] See also Figure 5 , the embodiment of the present application also provides a signal measurement method. The detailed steps of the method are as follows:

[0254] S501: The network device configures the time-frequency position of the SRS, CSI-RS resource configuration information for CSI measurement, and CSI feedback information through RRC signaling.

[0255] The network equipment configures the time-frequency location of the SRS, including the number of SRS pilot symbols, symbol location, and frequency domain location. For details, see the SRS-Config information element defined in the 3GPP TS 38.331 protocol.

[0256] In order to measure CSI, RRC also needs to configure CSI-RS resource configuration information and CSI feedback information for CSI measurement. The RRC information units involved may include CSI-MeasConfig, CSI-ResourceConfig, CSI-ReportConfig IE, etc. The CSI-ReportConfig IE contains the CSI content that the terminal device needs to feedback, such as CQI, PMI, RI, etc. In the implementation of this application, there is no need to modify the configuration of CSI-RS measurement, namely CSI-MeasConfig, CSI-ResourceConfig. However, since new content needs to be fed back (i.e. channel delay information, Doppler frequency offset, etc.), it is necessary to add a new indication to the CSI-ReportConfig IE. The specific implementation method of this part of the content can be found in the content of part (1) in the above-mentioned embodiment 1 or embodiment 2, which will not be repeated here.

[0257] S502: The network device sends a downlink reference signal for downlink channel measurement, such as SSB, CSI-RS, etc.

[0258] S503. The terminal device performs downlink channel measurement based on the reference signal for channel measurement sent by the network device and feeds back the measured downlink CSI information. When the present application is implemented, in addition to the need to feedback CQI, PMI, and RI, additional feedback is required on the downlink channel delay, the Doppler frequency deviation of the downlink channel, the strength of the downlink time domain channel, and other information. The specific feedback information can be carried by the physical uplink control channel (PUCCH) or the PUSCH channel. The specific feedback method of the downlink channel delay, the downlink channel Doppler frequency deviation, and the strength of the downlink time domain channel can be found in the above-mentioned embodiment 1 or embodiment 2, part (2), which will not be repeated here.

[0259] S504: The terminal device sends an SRS signal to the network device.

[0260] S505: The network device receives the SRS pilot signal sent by the terminal device and the downlink channel information fed back by the terminal device, performs channel estimation based on the SRS pilot signal and the downlink channel information, and estimates the channel position of the SRS.

[0261] S506: The network device performs uplink CSI measurement based on the SRS channel estimated in S505, including calculation of uplink CQI, PMI, RI, etc.

[0262] In this embodiment, when the network device performs SRS channel estimation, it performs channel estimation based on the uplink pilot and in combination with the prior information of the channel fed back by the terminal device (such as the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel). This can improve the upper limit of the channel estimation performance under a given pilot density, or reduce the pilot overhead while ensuring a certain channel estimation performance. It can take into account both the uplink channel estimation performance and the uplink pilot overhead at the same time, which is conducive to the accurate measurement of the uplink CSI.

[0263] It should be understood that the information transmission method and channel estimation method provided in the embodiments of the present application can be applied not only to PUSCH data demodulation scenarios and CSI measurement scenarios, but also to other scenarios requiring uplink channel estimation.

[0264] The above embodiments in the embodiments of the present application can be combined with each other to achieve different technical effects.

[0265] The following describes the device used to implement the above method in the embodiment of the present application in conjunction with the accompanying drawings. Therefore, the above content can be used in subsequent embodiments, and repeated content will not be repeated.

[0266] See Figure 6 , is a schematic diagram of the structure of an information receiving device provided in an embodiment of the present application. The device may be the network device or a device in the network device in the above embodiment, and the device includes:

[0267] A sending unit 601 is configured to send configuration information of feedback information to a terminal device, where the configuration information of the feedback information instructs the terminal device to feed back one or more of the Doppler frequency shift of a downlink channel, the delay of the downlink channel, or the strength of a downlink time domain channel;

[0268] The receiving unit 602 is configured to receive one or more of the following: indication information of the Doppler frequency shift of the downlink channel, indication information of the delay of the downlink channel, or indication information of the strength of the downlink time domain channel from the terminal device.

[0269] In one possible design, the configuration information of the feedback information may be downlink CSI configuration information, and one or more of the indication information of the Doppler frequency deviation of the downlink channel, the indication information of the delay of the downlink channel, or the indication information of the strength of the downlink time domain channel may be carried by the downlink CSI.

[0270] In one possible design, the configuration information of the feedback information can be carried in radio resource control RRC signaling or media access control MAC signaling.

[0271] In one possible design, the Doppler frequency deviation of the downlink channel may include one or more of the Doppler frequency deviation of each path of the downlink channel, the maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the downlink channel, or the average Doppler frequency deviation of all paths of the downlink channel.

[0272] In one possible design, the delay of the downlink channel may include: the delay of each path of the downlink channel, the maximum delay among the delays of all paths of the downlink channel, the average delay of all paths of the downlink channel, the delay of other paths of the wireless channel except the first path, or the delay of other paths of the wireless channel except the first path relative to the first path, etc. One or more of the following.

[0273] In one possible design, the strength of the downlink time domain channel may include one or more of: the strength of each path of the downlink channel, the square of the strength of each path of the downlink channel, the strength or the square of the strength of other paths of the wireless channel except the first path, or the strength of other paths of the wireless channel except the first path relative to the first path.

[0274] In one possible design, the configuration information of the feedback information may further indicate the number of paths of the downlink channel fed back by the terminal device; the receiving unit 602 may further be used to receive indication information of the number of paths of the downlink channel from the terminal device.

[0275] In one possible design, the configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information further instructs the terminal device to feedback the wireless channel delay and / or downlink time domain channel strength of the channel measurement signal port included in the channel measurement signal resource;

[0276] The receiving unit 602 is further configured to receive wireless channel delays and / or downlink time domain channel strengths under all or part of the channel measurement signal ports fed back from the terminal device.

[0277] In one possible design, the channel measurement signal is a channel state information reference signal CSI-RS.

[0278] In one possible design, the device may also include: a processing unit 603, used to perform uplink channel estimation based on the pilot signal and one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel or the strength of the downlink time domain channel.

[0279] In one possible design, the processing unit 603 is specifically used to: perform channel estimation based on the pilot signal to generate a first channel estimation result; correct the first channel estimation result based on one or more of the Doppler frequency deviation of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel, and obtain a second channel estimation result as the result of the uplink channel estimation.

[0280] In one possible design, the processing unit 603 is specifically configured to estimate the autocorrelation matrix R of the uplink channel H based on one or more of the Doppler frequency deviation of the downlink channel, the time delay of the downlink channel, or the strength of the downlink time domain channel. HH ; The autocorrelation matrix R of the uplink channel H HH Bring in the minimum mean square error MMSE algorithm to derive and solve the uplink channel H to obtain the estimated result H of the uplink channel H mmse .

[0281] Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0282] See Figure 7 , is a schematic diagram of the structure of an information sending device provided in an embodiment of the present application. The device may be the terminal device or a device in the terminal device in the above embodiment, and the device includes:

[0283] A receiving unit 701 is configured to receive configuration information of feedback information from a network device, wherein the configuration information of the feedback information instructs the terminal device to feedback one or more of the Doppler frequency shift of the downlink channel, the delay of the downlink channel, or the strength of the downlink time domain channel;

[0284] The sending unit 702 is configured to send one or more of indication information of the Doppler frequency shift of the downlink channel, indication information of the time delay of the downlink channel, or indication information of the strength of the downlink time domain channel to the network device.

[0285] In one possible design, the configuration information of the feedback information may be downlink CSI configuration information, and one or more of the indication information of the Doppler frequency deviation of the downlink channel, the indication information of the delay of the downlink channel, or the indication information of the strength of the downlink time domain channel may be carried by the downlink CSI.

[0286] In one possible design, the configuration information of the feedback information can be carried in radio resource control RRC signaling or media access control MAC signaling.

[0287] In one possible design, the Doppler frequency deviation of the downlink channel may include one or more of the Doppler frequency deviation of each path of the downlink channel, the maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the downlink channel, or the average Doppler frequency deviation of all paths of the downlink channel.

[0288] In one possible design, the delay of the downlink channel may include one or more of the delay of each path of the downlink channel, the maximum delay among the delays of all paths of the downlink channel, the average delay of all paths of the downlink channel, the delay of other paths of the wireless channel except the first path, or the delay of other paths of the wireless channel except the first path relative to the first path.

[0289] In one possible design, the strength of the downlink time domain channel may include one or more of: the strength of each path of the downlink channel, the square of the strength of each path of the downlink channel, the strength or the square of the strength of other paths of the wireless channel except the first path, or the strength of other paths of the wireless channel except the first path relative to the first path.

[0290] In one possible design, the configuration information of the feedback information may further indicate the number of paths of the downlink channel fed back by the terminal device; the sending unit 702 may further be used to send indication information of the number of paths of the downlink channel to the network device.

[0291] In one possible design, the configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information further instructs the terminal device to feedback the wireless channel delay and / or downlink time domain channel strength of the channel measurement signal port included in the channel measurement signal resource;

[0292] The sending unit 702 is further configured to send the wireless channel delay and / or downlink time domain channel strength of all or part of the channel measurement signal ports to the network device.

[0293] In one possible design, the channel measurement signal is a channel state information reference signal CSI-RS.

[0294] Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0295] See Figure 8, is a schematic diagram of the structure of another information receiving device provided in an embodiment of the present application. The device may be the network device or a device in the network device in the above embodiment, and the device includes:

[0296] Memory 801, used for storing computer programs;

[0297] The processor 802 is configured to execute the computer program stored in the memory 801 so that the apparatus executes the method executed by the network device in the above-mentioned method embodiment of the present application.

[0298] The processor involved in the embodiments of the present application can be implemented by a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD) or other integrated chips. In different embodiments, the processor may include one or more processors, for example, one or more central processing units (CPUs), which may be integrated into a chip or may be the chip itself.

[0299] The memory involved in the embodiments of the present application can be implemented by random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or portable read-only memory (Compact Disc Read-Only Memory, CD-ROM).

[0300] In one possible approach, the processor and memory may be connected to each other via a bus; the bus may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0301] See Figure 9 , is a schematic diagram of the structure of another information sending device provided in an embodiment of the present application. The device may be the terminal device or a device in the terminal device in the above embodiment, and the device includes:

[0302] Memory 901, used for storing computer programs;

[0303] The processor 902 is used to execute the computer program stored in the memory 901, so that the apparatus performs the method performed by the terminal device in the above-mentioned method embodiment of the present application.

[0304] See also Figure 10 , is a structural diagram of another information receiving device provided in an embodiment of the present application. The device may be a network device or a device in a network device in the above embodiment, and the device includes a processor 1001 and a transceiver 1002.

[0305] The processor 1001 is configured to support the apparatus in performing the corresponding functions of the network device in the above-mentioned method embodiment of the present application. The transceiver 1002 is used to support communication between the network device and other devices (such as terminal devices). The transceiver 1002 can be an independent receiver, an independent transmitter, a transceiver with integrated transceiver functions, or an interface circuit.

[0306] See also Figure 11 , is a structural diagram of another information sending device provided in an embodiment of the present application. The device may be a terminal device or a device in a terminal device in the above embodiment, and the device includes a processor 1101 and a transceiver 1102.

[0307] The processor 1101 is configured to support the apparatus in performing the corresponding functions of the terminal device in the above-mentioned method embodiment of the present application. The transceiver 1102 is used to support communication between the terminal device and other devices (such as network devices). The transceiver 1102 can be an independent receiver, an independent transmitter, a transceiver with integrated transceiver functions, or an interface circuit.

[0308] Based on the same technical concept, an embodiment of the present application also provides a computer-readable storage medium, including a program or instruction. When the program or instruction is run on a computer, the method in the embodiment of the present application is executed.

[0309] Based on the same technical concept, an embodiment of the present application also provides a computer-readable storage medium, including a program or instruction. When the program or instruction is run on a computer, the method in the embodiment of the present application is executed.

[0310] Based on the same technical concept, an embodiment of the present application further provides a chip, which is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method in the embodiment of the present application.

[0311] Based on the same technical concept, an embodiment of the present application further provides a chip, which is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method in the embodiment of the present application.

[0312] Based on the same technical concept, an embodiment of the present application also provides a wireless communication system, which includes the network device and terminal device involved in the embodiment of the present application.

[0313] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0314] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0315] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0316] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0317] Obviously, those skilled in the art may make various modifications and variations to this application without departing from the scope of protection of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for receiving information, characterized in that: include: Sending feedback information configuration information to the terminal device, where the feedback information configuration information instructs the terminal device to feed back one or more of the Doppler frequency shift of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel; Receiving one or more of indication information of Doppler frequency shift of a wireless channel, indication information of a time delay of a wireless channel, or indication information of strength of a wireless time domain channel from the terminal device; The Doppler frequency deviation of the wireless channel includes the Doppler frequency deviation of at least one path of the wireless channel, the time delay of the wireless channel includes the time delay of at least one path of the wireless channel, and the strength of the wireless time domain channel includes the strength of at least one path of the wireless channel; The configuration information of the feedback information further indicates the path number of the wireless channel fed back by the terminal device.

2. The method according to claim 1, wherein The configuration information of the feedback information is CSI configuration information, and one or more of the indication information of the Doppler frequency shift of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel is carried by downlink CSI.

3. The method according to claim 2, wherein The configuration information of the feedback information is carried in radio resource control RRC signaling or media access control MAC signaling.

4. The method according to claim 1, wherein The Doppler frequency deviation of the wireless channel includes: The Doppler frequency deviation of each path of the wireless channel; or The maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the wireless channel; or The average Doppler frequency deviation of all paths of the wireless channel.

5. The method according to claim 1, wherein The time delay of the wireless channel includes: The delay of each path of the wireless channel; or The maximum delay among the delays of all paths of the wireless channel; or The average delay of all paths of the wireless channel; or The delay of other paths of the wireless channel except the first path; or The time delays of the other paths of the wireless channel except the first path relative to the first path.

6. The method according to claim 1, wherein The strength of the wireless time domain channel includes: The strength of each path of the wireless channel; or The square of the strength of each path of the wireless channel; or The strength or the square of the strength of the other paths of the wireless channel except the first path; or The strength of the other paths of the wireless channel except the first path relative to the first path.

7. The method according to claim 1, wherein After sending the configuration information of the feedback information to the terminal device, it also includes: Receive indication information of the path number of the wireless channel of the terminal device.

8. The method according to claim 2, wherein The configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information further instructs the terminal device to feed back the wireless channel delay and / or the strength of the wireless time domain channel of the channel measurement signal port included in the channel measurement signal resource; After sending the configuration information of the feedback information to the terminal device, it also includes: Receive the wireless channel delay and / or wireless time domain channel strength under all or part of the channel measurement signal ports fed back from the terminal device.

9. The method according to claim 8, wherein The channel measurement signal is a channel state information reference signal CSI-RS.

10. The method according to any one of claims 1 to 9, wherein Also includes: Uplink channel estimation is performed based on the pilot signal and one or more of the Doppler frequency offset of the wireless channel, the time delay of the wireless channel, or the strength of the wireless time domain channel.

11. The method according to any one of claims 1 to 9, wherein: The wireless channel is a downlink channel.

12. A method for sending information, characterized in that: include: Receiving configuration information of feedback information from a network device, wherein the configuration information of the feedback information instructs the terminal device to feed back one or more of a Doppler frequency shift of a wireless channel, a time delay of a wireless channel, or a strength of a wireless time domain channel; Sending one or more of indication information of Doppler frequency shift of a wireless channel, indication information of delay of a wireless channel, or indication information of strength of a wireless time domain channel to the network device; The Doppler frequency deviation of the wireless channel includes the Doppler frequency deviation of at least one path of the wireless channel, the time delay of the wireless channel includes the time delay of at least one path of the wireless channel, and the strength of the wireless time domain channel includes the strength of at least one path of the wireless channel; The configuration information of the feedback information further indicates the path number of the wireless channel fed back by the terminal device.

13. The method according to claim 12, wherein: The configuration information of the feedback information is downlink CSI configuration information, and one or more of the indication information of the Doppler frequency shift of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel is carried by the downlink CSI.

14. The method according to claim 13, wherein The configuration information of the feedback information is carried in radio resource control RRC signaling or media access control MAC signaling.

15. The method according to claim 12, wherein The Doppler frequency deviation of the wireless channel includes: The Doppler frequency deviation of each path of the wireless channel; or The maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the wireless channel; or The average Doppler frequency deviation of all paths of the wireless channel.

16. The method according to claim 12, wherein The time delay of the wireless channel includes: The delay of each path of the wireless channel; or The maximum delay among the delays of all paths of the wireless channel; or The average delay of all paths of the wireless channel; or The delay of other paths of the wireless channel except the first path; or The time delays of the other paths of the wireless channel except the first path relative to the first path.

17. The method according to claim 12, wherein The strength of the wireless time domain channel includes: The strength of each path of the wireless channel; or The square of the strength of each path of the wireless channel; or The strength or the square of the strength of the other paths of the wireless channel except the first path; or The strength of the other paths of the wireless channel except the first path relative to the first path.

18. The method according to claim 12, wherein After receiving the configuration information of the feedback information from the network device, the following is also included: Sending indication information of the number of paths of the wireless channel to the network device.

19. The method according to claim 13, wherein The configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information further instructs the terminal device to feed back the wireless channel delay and / or the strength of the wireless time domain channel of the channel measurement signal port included in the channel measurement signal resource; After receiving the configuration information of the feedback information from the network device, the following is also included: Sending the wireless channel delay and / or wireless time domain channel strength of all or part of the channel measurement signal ports to the network device.

20. The method according to claim 19, wherein The channel measurement signal is a channel state information reference signal CSI-RS.

21. The method according to any one of claims 12 to 20, wherein: The wireless channel is a downlink channel.

22. An information receiving device, characterized in that: include: a sending unit, configured to send configuration information of feedback information to a terminal device, wherein the configuration information of the feedback information instructs the terminal device to feed back one or more of the Doppler frequency shift of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel; a receiving unit, configured to receive one or more of indication information of Doppler frequency shift of a wireless channel, indication information of time delay of a wireless channel, or indication information of strength of a wireless time domain channel from the terminal device; The Doppler frequency deviation of the wireless channel includes the Doppler frequency deviation of at least one path of the wireless channel, the time delay of the wireless channel includes the time delay of at least one path of the wireless channel, and the strength of the wireless time domain channel includes the strength of at least one path of the wireless channel.

23. The device according to claim 22, wherein The configuration information of the feedback information is downlink CSI configuration information, and one or more of the indication information of the Doppler frequency shift of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel is carried by the downlink CSI.

24. The device according to claim 23, wherein The configuration information of the feedback information is carried in radio resource control RRC signaling or media access control MAC signaling.

25. The device according to claim 22, wherein The Doppler frequency deviation of the wireless channel includes: The Doppler frequency deviation of each path of the wireless channel; or The maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the wireless channel; or The average Doppler frequency deviation of all paths of the wireless channel.

26. The device according to claim 22, wherein The time delay of the wireless channel includes: The delay of each path of the wireless channel; or The maximum delay among the delays of all paths of the wireless channel; or The average delay of all paths of the wireless channel; or The delay of other paths of the wireless channel except the first path; or The time delays of the other paths of the wireless channel except the first path relative to the first path.

27. The device according to claim 22, wherein The strength of the wireless time domain channel includes: The strength of each path of the wireless channel; or The square of the strength of each path of the wireless channel; or The strength or the square of the strength of the other paths of the wireless channel except the first path; or The strength of the other paths of the wireless channel except the first path relative to the first path.

28. The device according to claim 22, wherein The receiving unit is further configured to receive indication information of the number of paths of the wireless channel of the terminal device from the terminal device.

29. The device according to claim 23, wherein The configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information further instructs the terminal device to feed back the wireless channel delay and / or the strength of the wireless time domain channel of the channel measurement signal port included in the channel measurement signal resource; The receiving unit is further configured to receive wireless channel delays and / or wireless time domain channel strengths at all or part of the channel measurement signal ports fed back from the terminal device.

30. The device according to claim 29, wherein The channel measurement signal is a channel state information reference signal CSI-RS.

31. The device according to any one of claims 22 to 30, characterized in that The device further comprises: The processing unit is configured to perform uplink channel estimation based on the pilot signal and one or more of the Doppler frequency shift of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel.

32. The device according to any one of claims 22 to 30, characterized in that The wireless channel is a downlink channel.

33. An information sending device, characterized in that: include: a receiving unit, configured to receive configuration information of feedback information from a network device, wherein the configuration information of the feedback information instructs the terminal device to feedback one or more of the Doppler frequency shift of the wireless channel, the delay of the wireless channel, or the strength of the wireless time domain channel; a sending unit, configured to send one or more of indication information of the Doppler frequency shift of the wireless channel, indication information of the delay of the wireless channel, or indication information of the strength of the wireless time domain channel to the network device; The Doppler frequency deviation of the wireless channel includes the Doppler frequency deviation of at least one path of the wireless channel, the time delay of the wireless channel includes the time delay of at least one path of the wireless channel, and the strength of the wireless time domain channel includes the strength of at least one path of the wireless channel.

34. The device according to claim 33, wherein The configuration information of the feedback information is downlink CSI configuration information, and one or more of the indication information of the Doppler frequency shift of the wireless channel, the indication information of the delay of the wireless channel, or the indication information of the strength of the wireless time domain channel is carried by the downlink CSI.

35. The device according to claim 34, wherein The configuration information of the feedback information is carried in radio resource control RRC signaling or media access control MAC signaling.

36. The device according to claim 33, wherein The Doppler frequency deviation of the wireless channel includes: The Doppler frequency deviation of each path of the wireless channel; or The maximum Doppler frequency deviation among the Doppler frequency deviations of all paths of the wireless channel; or The average Doppler frequency deviation of all paths of the wireless channel.

37. The device according to claim 33, wherein The time delay of the wireless channel includes: The delay of each path of the wireless channel; or The maximum delay among the delays of all paths of the wireless channel; or The average delay of all paths of the wireless channel; or The delay of other paths of the wireless channel except the first path; or The time delays of the other paths of the wireless channel except the first path relative to the first path.

38. The device according to claim 33, wherein The strength of the wireless time domain channel includes: The strength of each path of the wireless channel; or The square of the strength of each path of the wireless channel; or The strength or the square of the strength of the other paths of the wireless channel except the first path; or The strength of the other paths of the wireless channel except the first path relative to the first path.

39. The device according to claim 33, wherein The sending unit is further configured to send indication information of the number of paths of the wireless channel to the network device.

40. The device according to claim 34, wherein The configuration information of the feedback information includes channel measurement signal resource indication information, and the configuration information of the feedback information further instructs the terminal device to feed back the wireless channel delay and / or the strength of the wireless time domain channel of the channel measurement signal port included in the channel measurement signal resource; The sending unit is further configured to send the wireless channel delays and / or wireless time domain channel strengths of all or part of the channel measurement signal ports to the network device.

41. The device according to claim 40, wherein The channel measurement signal is a channel state information reference signal CSI-RS.

42. The device according to any one of claims 33 to 41, characterized in that The wireless channel is a downlink channel.

43. An information receiving device, characterized in that: include: Memory for storing computer programs; A processor, configured to execute the computer program stored in the memory, so that the apparatus performs the method according to any one of claims 1 to 11.

44. An information receiving device, characterized in that: include: memory for storing computer programs; A processor, configured to execute the computer program stored in the memory, so that the apparatus performs the method according to any one of claims 12 to 21.

45. A computer-readable storage medium, characterized in that The method comprises a program or an instruction, and when the program or the instruction is run on a computer, the method according to any one of claims 1 to 11 is executed.

46. ​​A computer-readable storage medium, characterized in that The method comprises a program or an instruction, and when the program or the instruction is run on a computer, the method according to any one of claims 12 to 21 is executed.

47. A chip, characterized in that: The chip is coupled to the memory and is used to read and execute program instructions stored in the memory to implement the method according to any one of claims 1 to 11.

48. A chip, characterized in that The chip is coupled to the memory and is used to read and execute program instructions stored in the memory to implement the method according to any one of claims 12 to 21.

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