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CN-122027101-A - Communication method and communication device

CN122027101ACN 122027101 ACN122027101 ACN 122027101ACN-122027101-A

Abstract

The present application relates to the field of communications, and in particular, to a communication method and a communication device. With the application of high frequency bands such as 6GHz, the requirement of wireless communication on beam directivity is further increased, which requires the base station to generate a beam using a weighting coefficient with higher accuracy. In the carrier aggregation scenario, the downlink receiving capability of the terminal is generally greater than the uplink transmitting capability, and the base station wants to acquire the weighting coefficients of a plurality of downlink channels according to the channel reciprocity principle, so that the terminal needs to send SRS on a plurality of uplink carriers in turn, which leads to cycle elongation of the SRS, generates a channel aging phenomenon, and affects the measurement accuracy of the downlink channels. In the application, the base station determines a feature space substrate with higher accuracy based on the SRS on a single carrier, and then determines the precoding matrix of a plurality of carriers by using the feature space substrate, and the terminal does not need to send SRS on the plurality of carriers, so that the measurement accuracy of the downlink channel can be improved while the downlink channel is comprehensively measured.

Inventors

  • HUANG XIUXUAN
  • DING MENGYING
  • PENG JINLIN

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (13)

  1. 1. A method of communication, comprising: Receiving a first uplink signal on a first carrier; Determining a characteristic space substrate of the first carrier according to the first uplink signal; Determining a target coefficient matrix, wherein the target coefficient matrix is a projected coefficient matrix of a channel matrix of a downlink channel of a target carrier on a characteristic space of the target carrier, and the target carrier is a second carrier or the first carrier; And determining a precoding matrix of the target carrier according to the characteristic space substrate of the first carrier and the target coefficient matrix.
  2. 2. The method of claim 1, wherein the determining the precoding matrix for the target carrier based on the eigenspace basis for the first carrier and the target coefficient matrix comprises: According to Determining a channel matrix of the target carrier, wherein H n is the channel matrix of the target carrier, V CC1 is a feature space base of the first carrier, W f_CCn is the target coefficient matrix, and x represents matrix multiplication operation; and determining a precoding matrix of the target carrier according to the channel matrix of the target carrier.
  3. 3. The method according to claim 1 or 2, wherein said determining a matrix of target coefficients comprises: receiving an index of the target coefficient matrix on a Channel State Information (CSI) resource; and determining the target coefficient matrix according to the index.
  4. 4. A method according to any one of claim 1 to 3, wherein, The first carrier and the second carrier are continuous carriers, or the difference value between the frequency point of the first carrier and the frequency point of the second carrier is smaller than or equal to a first threshold value.
  5. 5. The method according to any one of claims 1 to 4, further comprising: and transmitting a target downlink signal on the target carrier, wherein the target downlink signal is used for determining the target coefficient matrix by the terminal.
  6. 6. A method of communication, comprising: Transmitting a first uplink signal on a first carrier, wherein the first uplink signal is used for determining a characteristic space substrate of the first carrier; receiving a target downlink signal on a target carrier, wherein the target carrier is a second carrier or the first carrier; Determining a channel matrix of the target carrier according to the target downlink signal; determining a target coefficient matrix according to the channel matrix of the target carrier and the feature space substrate of the first carrier, wherein the target coefficient matrix is a projected coefficient matrix of the channel matrix of the target carrier on the feature space of the target carrier; And sending first uplink control information, wherein the first uplink control information indicates the target coefficient matrix.
  7. 7. The method of claim 6, wherein said determining a target coefficient matrix from a channel matrix of said target carrier and a eigenspace basis of said first carrier comprises: According to And determining the target coefficient matrix, wherein W f_CCn is the target coefficient matrix, V CC1 is a feature space substrate of the first carrier, H n is a channel matrix of the target carrier, H represents a conjugate transpose symbol, and x represents matrix multiplication operation.
  8. 8. The method according to claim 6 or 7, characterized in that the method further comprises: and receiving a first downlink signaling, wherein the first downlink signaling indicates a feature space substrate of the first carrier.
  9. 9. The method according to claim 6 or 7, characterized in that the method further comprises: And determining a characteristic space substrate of the first carrier according to the downlink signal of the first carrier.
  10. 10. The method according to any one of claims 6 to 9, wherein, The first carrier and the second carrier are continuous carriers, or the difference value between the frequency point of the first carrier and the frequency point of the second carrier is smaller than or equal to a first threshold value.
  11. 11. A communication device, comprising: A processor for implementing the method of any one of claims 1 to 5 or the method of any one of claims 6 to 10 by logic circuitry or executing code instructions; And the interface circuit is used for receiving signals from other devices and transmitting the signals to the processor or sending the signals from the processor to the other devices.
  12. 12. A computer readable storage medium storing a computer program or instructions which, when executed by a communication device, performs the method of any one of claims 1 to 5 or performs the method of any one of claims 6 to 10.
  13. 13. A computer program product comprising a computer program or instructions which, when executed by a communication device, performs the method of any one of claims 1 to 5 or performs the method of any one of claims 6 to 10.

Description

Communication method and communication device Technical Field The present application relates to the field of communications, and in particular, to a communication method and a communication device. Background In the fifth generation (5 th generation mobile communication technology, 5G) mobile communication system, large-scale multiple-input multiple-output (M-MIMO) has been significantly improved in terms of coverage, capacity, and interference resistance. Beamforming is one of the important characteristics of M-MIMO, and its function is to weight radio frequency signals to form a narrowband beam directed to a terminal. The more the number of antennas, the narrower the generated beam, resulting in better interference rejection and higher space division multiplexing gain. In the beamforming process, if the weighting coefficient of each array element can be properly controlled according to the channel condition, the signal strength can be enhanced in the desired direction while the interference to the undesired direction can be reduced. Thus, the exact weighting coefficients are key factors for the beamforming to function. For the time division duplex scenario, one method for obtaining the weighting coefficient of the downlink channel is that the base station receives a Sounding REFERENCE SIGNAL (SRS) sent by the terminal through the uplink channel, and calculates a precoding matrix (i.e. a weighting coefficient matrix or a weight matrix) of the corresponding downlink channel according to the channel reciprocity principle, so as to determine the weighting coefficient of the downlink channel. In the carrier aggregation scenario, the downlink receiving capability of the terminal is generally greater than the uplink transmitting capability, for example, the terminal may receive signals from three downlink carriers at the same time, but only transmit signals in one uplink carrier at the same time, so that the base station cannot determine the channel information of a part of the downlink carriers in time through the SRS on the corresponding uplink carrier according to the channel reciprocity principle, which may result in insufficient measurement of the downlink channels when determining the precoding matrix based on the SRS. Therefore, the 5G mobile communication system supports SRS carrier switching, that is, the terminal can switch from the working carrier to other carriers to send SRS, and return to the working carrier to send data and signaling after the SRS is sent. The method can solve the problem that the measurement of the downlink channel is not comprehensive to a certain extent, however, the terminal needs to send SRS on a plurality of uplink carriers in turn, so that the period of the SRS is prolonged, the aging phenomenon of the channel is generated, and the measurement accuracy of the downlink channel is affected. Disclosure of Invention Embodiments of the present application provide a communication method, a communication apparatus, a communication system, a computer-readable storage medium, and a computer program product capable of improving measurement accuracy of a downlink channel while comprehensively measuring the downlink channel. In a first aspect, embodiments of the present application provide a communication method that may be performed by a network device (e.g., a base station) or a chip applied to the network device, and will be described below by taking the base station as an example. The method comprises the steps of receiving a first uplink signal on a first carrier, determining a characteristic space substrate of the first carrier according to the first uplink signal, determining a target coefficient matrix, wherein the target coefficient matrix is a projected coefficient matrix of a channel matrix (or channel information) of a downlink channel of the target carrier on a characteristic space of the target carrier, the target carrier is a second carrier or the first carrier, determining a precoding matrix of the target carrier according to the characteristic space substrate of the first carrier and the target coefficient matrix, or determining the channel matrix of the target carrier according to the characteristic space substrate of the first carrier and the target coefficient matrix. The base station may estimate a channel matrix from the first uplink signal and determine a eigenspace basis for the first carrier from the channel matrix. Since the channel matrix estimated based on the first uplink signal is not quantized and compressed, the base station determines a feature space base (i.e., a feature space base of the first carrier) from the first uplink signal with higher accuracy than a feature space base determined based on the downlink signal (e.g., a channel state information reference signal). For multiple carriers (for example, the first carrier and the second carrier) with similar frequency domain positions, the feature space bases of different carriers are approximately t