Network-side device, terminal-side device, communication method, communication apparatus, and medium

Abstract

The present disclosure provides a network-side device, a terminal-side device, a communication method, a communication apparatus, and a medium. The network-side device includes processing circuitry configured to: send, to a terminal-side device, multiple pairs of polarized transmission beams with different indicated directions, each of the multiple pairs of polarized transmission beams including a first polarized transmission beam and a second polarized transmission beam with the same indicated direction, the first polarized transmission beam having a first polarization direction, and the second polarized transmission beam having a second polarization direction different from the first polarization direction; receive, from the terminal-side device, a feedback signal including beam identification information and cross-polarization ratio information of a polarized transmission beam selected by the terminal-side device from the multiple pairs of polarized transmission beams; and determine, based on the cross-polarization ratio information of the selected polarized transmission beam, whether the selected polarized transmission beam can be used for polarization multiplexing.

Description

[0001] Priority Statement

[0002] This application claims priority to Chinese Patent Application No. 201911090031.X, filed on November 8, 2019, entitled “Network-side device, terminal-side device, communication method, communication apparatus and medium”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of wireless communication, and more specifically, to network-side devices, terminal-side devices, communication methods, and media for performing wireless communication. Background Technology

[0004] Electromagnetic waves have different polarization modes, including linear polarization (such as...). Figure 1A (as shown) and elliptic polarization (as shown) Figure 1B (As shown). Linear polarization includes, for example, vertical polarization and horizontal polarization. If the electric field direction is perpendicular to the ground, it is vertical polarization. If the electric field direction is horizontal to the ground, it is horizontal polarization. Similarly, linear polarization also includes ±45° polarization, which is widely used on the base station side (e.g., Figure 2 (As shown). Elliptic polarization includes left-handed and right-handed polarization. Circular polarization is a special case of elliptic polarization. For example... Figure 2 The ±45° polarized uniform planar array (UPA) shown can provide orthogonal polarization channels for polarization diversity or multiplexing. In fact, for lower frequency signals (e.g., sub-6GHz), the polarization characteristics of electromagnetic waves are altered during propagation due to abundant reflection and scattering, making the polarization characteristics insignificant at the receiver. Therefore, users typically use vertically polarized antennas to effectively receive ±45° polarized signals transmitted by the base station. However, for higher frequency signals (e.g., millimeter waves above 6GHz), since they are primarily line-of-sight (LoS) signals, the polarized signals experience less reflection and scattering during propagation, and the polarization characteristics of the received signal remain significant and largely consistent with those at the transmitter. Therefore, for high-frequency signals, users need to perform polarization matching with the base station to obtain maximum beamforming gain. Beamforming gain is maximized when the base station and user use the same polarization. When the base station and user use different polarizations, polarization mismatch will significantly reduce the beamforming gain received by the user. Therefore, the introduction of polarization characteristics for different beams in beam management requires further research.

[0005] In the existing layer 1 reference signal received power (L1-RSRP) based beam management, the base station performs downlink beam training by sending CSI-RS. The user measures the RSRP of different sending beams and feeds back the CRI and RSRP corresponding to the sending beam with the highest RSRP. The base station determines the downlink sending beam selected by the user based on the CRI fed back by the user and performs downlink data transmission.

[0006] The L1-RSRP based scheme is more suitable for point-to-point single user MIMO transmission. However, when performing multi-user MIMO system data transmission, there may be a large interference between adjacent sending beams or users in the same sending beam. Therefore, the base station usually directly schedules these users in different time-frequency resources to reduce the interference between users. When the users are densely distributed, this multi-user scheduling method will cause the number of served users in a single time-frequency resource to be small, and the total spectral efficiency of the system to be low.

[0007] At present, in the Release 16 version of the 3GPP protocol, the layer 1 signal and interference plus noise ratio (L1-SINR) based beam selection scheme is widely discussed to reduce the case that the beam interference is large in the data transmission stage of multi-user MIMO. By additionally configuring a channel state information reference signal (CSI-RS) resource dedicated for beam interference measurement, in the multi-user case, the user measures and reports the SINR of different beams, and the base station configures the beam according to the SINR of different beams reported by multiple users to maximize the system performance.

[0008] However, in the L1-SINR based scheme, additional CSI-RS overhead is required, and the system implementation is very complex. In addition, the polarization characteristics of different beams are not considered in this scheme, so the degree of freedom of polarization cannot be effectively utilized. SUMMARY

[0009] In order to effectively utilize the polarization characteristics of the beam, the present disclosure proposes a polarization based beam management scheme.

[0010] According to an aspect of the present disclosure, a network-side device is provided, comprising processing circuitry configured to: transmit, to a terminal-side device, a plurality of pairs of polarized transmission beams having different indicated directions, each of the plurality of pairs of polarized transmission beams comprising a first polarized transmission beam and a second polarized transmission beam having a same indicated direction, the first polarized transmission beam having a first polarization direction, the second polarized transmission beam having a second polarization direction different from the first polarization direction; receive, from the terminal-side device, a feedback signal comprising beam identification information and cross-polarization ratio information of a polarized transmission beam selected by the terminal-side device from the plurality of pairs of polarized transmission beams; and determine, based on the cross-polarization ratio information of the selected polarized transmission beam, whether the selected polarized transmission beam can be used for polarization multiplexing.

[0011] According to another aspect of the present disclosure, a terminal-side device is provided, comprising processing circuitry configured to: receive, from a network-side device, a plurality of pairs of polarized transmission beams having different indicated directions, each of the plurality of pairs of polarized transmission beams comprising a first polarized transmission beam and a second polarized transmission beam having a same indicated direction, the first polarized transmission beam having a first polarization direction, the second polarized transmission beam having a second polarization direction different from the first polarization direction; select a polarized transmission beam from the plurality of pairs of polarized transmission beams; transmit, to the network-side device, a feedback signal comprising beam identification information and cross-polarization ratio information of the selected polarized transmission beam; and receive, from the network-side device, a signal in which the selected polarized transmission beam is polarization multiplexed, in a case that the network-side device determines, based on the cross-polarization ratio information of the selected polarized transmission beam, that the selected polarized transmission beam can be used for polarization multiplexing.

[0012] According to another aspect of the present disclosure, a communication method is provided, comprising: transmitting, to a terminal-side device, a plurality of pairs of polarized transmission beams having different indicated directions, each of the plurality of pairs of polarized transmission beams comprising a first polarized transmission beam and a second polarized transmission beam having a same indicated direction, the first polarized transmission beam having a first polarization direction, the second polarized transmission beam having a second polarization direction different from the first polarization direction;

[0013] receiving, from the terminal-side device, a feedback signal comprising beam identification information and cross-polarization ratio information of a polarized transmission beam selected by the terminal-side device from the plurality of pairs of polarized transmission beams; and determining, based on the cross-polarization ratio information of the selected polarized transmission beam, whether the selected polarized transmission beam can be used for polarization multiplexing.

[0014] According to another aspect of the present disclosure, a communication method is provided, comprising: receiving, from a network-side device, a plurality of pairs of polarized transmission beams with different indicated directions, each of the plurality of pairs of polarized transmission beams including a first polarized transmission beam and a second polarized transmission beam with a same indicated direction, the first polarized transmission beam having a first polarization direction, the second polarized transmission beam having a second polarization direction different from the first polarization direction; selecting a polarized transmission beam from the plurality of pairs of polarized transmission beams; transmitting, to the network-side device, a feedback signal including beam identification information of the selected polarized transmission beam and cross-polarization ratio information of the selected polarized transmission beam; and receiving, from the network-side device, a signal that is polarized multiplexed on the selected polarized transmission beam, in a case that the network-side device determines, based on the cross-polarization ratio information of the selected polarized transmission beam, that the selected polarized transmission beam is capable of being used for polarized multiplexing.

[0015] According to another aspect of the present disclosure, a network-side device is provided, comprising processing circuitry configured to: receive, from a terminal-side device, an uplink beam training signal with a plurality of pairs of polarized reception beams with different indicated directions, each of the plurality of pairs of polarized reception beams including a first polarized reception beam and a second polarized reception beam with a same indicated direction, the first polarized reception beam having a first polarization direction, the second polarized reception beam having a second polarization direction different from the first polarization direction; select a polarized reception beam from the plurality of pairs of polarized reception beams and take a polarization direction of the selected polarized reception beam as a selected polarization direction; transmit, to the terminal-side device, a plurality of polarized transmission beams with different indicated directions, the plurality of polarized transmission beams having the selected polarization direction; receive, from the terminal-side device, a feedback signal including beam identification information of a polarized transmission beam selected by the terminal-side device from the plurality of polarized transmission beams; and determine a cross-polarization ratio of the selected polarized transmission beam indicated by the beam identification information and determine whether the selected polarized transmission beam is capable of being used for polarized multiplexing based on the cross-polarization ratio of the selected polarized transmission beam.

[0016] According to another aspect of this disclosure, a terminal-side device is provided, including processing circuitry configured to: send an uplink beam training signal to a network-side device for selecting a polarized receiving beam from a plurality of pairs of polarized receiving beams having different indication directions, each pair of polarized receiving beams including a first polarized receiving beam and a second polarized receiving beam having the same indication direction, the first polarized receiving beam having a first polarization direction, and the second polarized receiving beam having a second polarization direction different from the first polarization direction; and receive an uplink beam training signal from the network-side device for selecting a polarized receiving beam from a plurality of pairs of polarized receiving beams having different indication directions. Multiple polarized transmit beams with the same indicated direction, the polarization direction of the multiple polarized transmit beams being the same as the polarization direction of the polarized receive beam selected by the network-side device; selecting a polarized transmit beam from the multiple polarized transmit beams; sending a feedback signal to the network-side device, the feedback signal including beam identification information of the selected polarized transmit beam; and polarizing multiplexing the selected polarized transmit beam when the network-side device determines, based on the cross-polarization ratio of the selected polarized transmit beam indicated by the beam identification information, that the selected polarized transmit beam can be used for polarization multiplexing.

[0017] According to another aspect of this disclosure, a communication method is provided, comprising: receiving an uplink beam training signal from a terminal-side device using multiple pairs of polarized receiving beams with different indication directions, each pair of polarized receiving beams including a first polarized receiving beam and a second polarized receiving beam having the same indication direction, the first polarized receiving beam having a first polarization direction, and the second polarized receiving beam having a second polarization direction different from the first polarization direction; selecting a polarized receiving beam from the multiple pairs of polarized receiving beams, and transmitting the selected polarized receiving beam... The polarization direction of the beam is selected as the polarization direction; multiple polarized transmission beams with different indicated directions are transmitted to the terminal-side device, the multiple polarized transmission beams having the selected polarization direction; a feedback signal is received from the terminal-side device, the feedback signal including beam identification information of the polarized transmission beam selected by the terminal-side device from the multiple polarized transmission beams; and the cross-polarization ratio of the selected polarized transmission beam indicated by the beam identification information is determined, and whether the selected polarized transmission beam can be used for polarization multiplexing is determined based on the cross-polarization ratio of the selected polarized transmission beam.

[0018] According to another aspect of this disclosure, a communication method is provided, comprising: transmitting to a network-side device an uplink beam training signal for selecting a polarized receiving beam from a plurality of pairs of polarized receiving beams having different indication directions, each pair of polarized receiving beams including a first polarized receiving beam and a second polarized receiving beam having the same indication direction, the first polarized receiving beam having a first polarization direction, and the second polarized receiving beam having a second polarization direction different from the first polarization direction; and receiving from the network-side device a plurality of polarized receiving beams having different indication directions. The network device transmits a plurality of polarized transmit beams, the polarization direction of which is the same as the polarization direction of a polarized receive beam selected by the network-side device; selects a polarized transmit beam from the plurality of polarized transmit beams; sends a feedback signal to the network-side device, the feedback signal including beam identification information of the selected polarized transmit beam; and receives a polarized multiplexed signal from the network-side device if the network-side device determines, based on the cross-polarization ratio of the selected polarized transmit beam indicated by the beam identification information, that the selected polarized transmit beam can be used for polarization multiplexing.

[0019] According to another aspect of this disclosure, a non-transitory computer-readable storage medium is provided, on which instructions are stored, which, when executed by a processor, cause the processor to perform the communication method of this disclosure.

[0020] According to another aspect of this disclosure, a communication apparatus is provided, including components for performing various steps of the communication method of this disclosure.

[0021] The scheme disclosed herein can effectively utilize the polarization characteristics of the beam and improve the spectral efficiency of the system through polarization multiplexing. Attached Figure Description

[0022] A better understanding of this disclosure can be obtained by considering the following detailed description of the embodiments in conjunction with the accompanying drawings. The same or similar reference numerals are used in the drawings to denote the same or similar parts. The accompanying drawings, together with the following detailed description, are incorporated in and form a part of this specification to illustrate embodiments of the disclosure and explain the principles and advantages of the disclosure.

[0023] Figure 1A and 1B This is a schematic diagram illustrating the linear and elliptical polarization of electromagnetic waves.

[0024] Figure 2 This is a schematic diagram showing a uniform planar array antenna with ±45° polarization.

[0025] Figure 3 This is a schematic diagram illustrating an example configuration of a communication system according to some embodiments of the present disclosure.

[0026] Figure 4 This is a flowchart illustrating the downlink beam training and feedback process according to an embodiment of the present invention.

[0027] Figure 5A and 5B This is a schematic diagram illustrating the transmission sequence of multiple pairs of polarized transmission beams according to embodiments of the present disclosure.

[0028] Figure 6 A communication method performed by a base station in a downlink beam training and feedback process according to an embodiment of the present disclosure is illustrated.

[0029] Figure 7 A communication method performed by a user equipment in a downlink beam training and feedback process according to an embodiment of the present disclosure is illustrated.

[0030] Figure 8 This is a flowchart illustrating the uplink and downlink polarization beam training and feedback process according to embodiments of the present disclosure.

[0031] Figure 9 This is a schematic diagram illustrating uplink polarized beam training according to an embodiment of the present disclosure.

[0032] Figure 10 This is a flowchart illustrating a polarization beam training and feedback process according to an embodiment of the present disclosure.

[0033] Figure 11 A communication method performed by a base station in a downlink beam training and feedback process according to an embodiment of the present disclosure is illustrated.

[0034] Figure 12 A communication method performed by a user equipment in a beam training and feedback process according to an embodiment of the present disclosure is illustrated.

[0035] Figure 13 This is a schematic diagram illustrating the configuration of a base station according to an embodiment of the present disclosure.

[0036] Figure 14 This is a schematic diagram illustrating the configuration of a user equipment according to an embodiment of the present disclosure.

[0037] Figure 15A , 15B Figures 1 and 15C are schematic diagrams illustrating downlink transmission using polarized transmit beams between a base station and two user equipment.

[0038] Figure 16A and 16B This is a schematic diagram illustrating a traditional multi-user scheduling scheme. Figure 16C and 16D This is a schematic diagram illustrating multi-user scheduling based on beam polarization characteristics according to an embodiment of the present disclosure.

[0039] Figure 17 The graph shows the simulation results of conventional multi-user scheduling and polarization beam-based multi-user scheduling according to embodiments of this disclosure.

[0040] Figure 18 This is a block diagram illustrating an example of a schematic configuration of a computing device to which the techniques of this disclosure can be applied.

[0041] Figure 19 This is a block diagram illustrating a first example of a schematic configuration of a gNB to which the technologies of this disclosure can be applied.

[0042] Figure 20 This is a block diagram illustrating a second example of a schematic configuration of a gNB to which the technologies of this disclosure can be applied.

[0043] Figure 21 This is a block diagram illustrating an example of a schematic configuration of a smartphone to which the technologies of this disclosure can be applied.

[0044] Figure 22 This is a block diagram illustrating an example of a schematic configuration of a car navigation device to which the technologies of this disclosure can be applied. Detailed Implementation

[0045] In the following description, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that in this specification and the drawings, the same reference numerals are used to denote structural elements having substantially the same function and structure, and repeated descriptions of these structural elements are omitted.

[0046] The description will proceed in the following order:

[0047] 1. System Overview

[0048] 2. Processing flow

[0049] 3. Application Examples

[0050] <1. System Overview>

[0051] This disclosure provides network-side devices and terminal-side devices capable of wirelessly communicating with each other. The network-side device can be implemented as a base station or a control entity of a base station, or a key component thereof. For example, the network-side device can be implemented as a processing chip in a base station or control entity, which can achieve wireless communication with the terminal-side device by controlling other components in the base station or control entity. The terminal-side device can be implemented as a user equipment (UE) or a key component thereof. For example, the terminal-side device can be implemented as a processing chip in a user equipment, which can achieve wireless communication with the network-side device by controlling other components in the user equipment. For simplicity, the following description of the communication system and communication flow of this disclosure will use a base station and a user equipment as examples.

[0052] First, a communication system of some embodiments of this disclosure will be briefly described. Figure 3 This is a schematic diagram illustrating an example configuration of a communication system 300 according to some embodiments of this disclosure. For example... Figure 3 As shown, the communication system 300 includes a base station 310 and user equipment 320A, 320B, and 320C. The base station 310 can wirelessly communicate with each of the user equipment 320A, 320B, and 320C. In this document, without needing to distinguish between user equipment 320A, 320B, and 320C, the reference numeral 320 is used to represent any one of the user equipment 320A, 320B, and 320C. It should be noted that... Figure 3 The number of user devices 320 shown is an example, and the number of user devices 320 is not limited to three; it can be any number.

[0053] Typically, base station 310 is configured with two antennas with different polarization directions: an antenna with a first polarization direction and an antenna with a second polarization direction. Base station 310 can transmit signals in the first polarization direction through the antenna with the first polarization direction and transmit signals in the second polarization direction through the antenna with the second polarization direction. In some embodiments of this disclosure, the first polarization direction and the second polarization direction can be as follows: Figure 2 The +45° and -45° polarization directions are shown. In other embodiments of this disclosure, the first and second polarization directions are horizontal and vertical polarization directions, respectively. In other embodiments of this disclosure, the first and second polarization directions are mutually perpendicular polarization directions.

[0054] Considering the strong directivity of antenna transmission and / or reception, base station 310 and / or user equipment 320 can apply beamforming to the transmitted and / or received signals to form transmit and / or receive beams. By confining the transmit and / or receive beams to a specific indication direction among multiple indication directions, the transmission and / or reception performance of the signal can be enhanced. Base station 310 and / or user equipment 320 can train and receive feedback from multiple transmit and / or receive beams with different indication directions to select the optimal transmit and / or receive beam.

[0055] When the base station 310 is configured with an antenna with a first polarization direction and an antenna with a second polarization direction, the base station 310 can transmit multiple pairs of transmission beams with different indication directions. Each pair of transmission beams includes a first polarization transmission beam and a second polarization transmission beam with the same indication direction. The first polarization transmission beam is transmitted by the antenna with the first polarization direction and has the first polarization direction. The second polarization transmission beam is transmitted by the antenna with the second polarization direction and has the second polarization direction.

[0056] Considering the antenna polarization characteristics at user equipment 320, even if the first polarized transmit beam and the second polarized transmit beam have the same transmit power at base station 310, their received power at user equipment 320 may differ. Specifically, regarding the antenna polarization characteristics at user equipment 320, when the polarization direction of the antenna is closer to the first polarization direction, the received power of the first polarized transmit beam at user equipment 320 will be higher than that of the second polarized transmit beam. Conversely, when the polarization direction of the antenna is closer to the second polarization direction, the received power of the first polarized transmit beam at user equipment 320 will be lower than that of the second polarized transmit beam.

[0057] The difference in received power between the first and second polarized transmit beams at the user equipment can be characterized by the cross-polarization ratio. A higher cross-polarization ratio indicates a greater difference in received power between the first and second polarized transmit beams at the user equipment 320. In this case, transmitting signals to the user equipment 320 using the polarized transmit beam with higher received power results in better communication quality, while transmitting signals to the user equipment 320 using the polarized transmit beam with lower received power leads to poorer communication quality. Therefore, the polarized transmit beam with lower received power can be used to transmit signals to other user equipments instead of the user equipment 320, as it causes less interference to the former. Thus, in this case, the first and second polarized transmit beams can be used for polarization multiplexing.

[0058] For example, if the receiving power of the first polarized transmit beam at the user equipment is high while the receiving power of the second polarized transmit beam at the user equipment 320 is low, the first polarized transmit beam can be used to transmit signals to the user equipment 320, while the second polarized transmit beam can be used to transmit signals to other user equipment.

[0059] <2. Processing Flow>

[0060] The following describes the communication process of downlink beam training and feedback between base station 310 and user equipment 320 to determine whether the polarization transmission beam of base station 310 can be used for polarization multiplexing. Figure 4 This is a flowchart illustrating a downlink beam training and feedback process 400 according to an embodiment of the present invention.

[0061] In step S402, base station 310 transmits downlink beam training signals using multiple pairs of polarized transmit beams with different indication directions. That is, base station 310 transmits multiple pairs of polarized transmit beams with different indication directions to user equipment 320, and user equipment 320 receives these beams from base station 310. Each pair of polarized transmit beams includes a first polarized transmit beam and a second polarized transmit beam with the same indication direction. The first polarized transmit beam has a first polarization direction. The second polarized transmit beam has a second polarization direction different from the first polarization direction.

[0062] When performing beam training, base station 310 can distinguish between the first polarization transmission beam and the second polarization transmission beam using different time-frequency resources. Based on the currently used time-frequency resources, user equipment 320 can identify the polarization transmission beam currently being trained. If base station 310 trains M pairs of polarization transmission beams, a total of 2M time-frequency resources are required.

[0063] In some embodiments, the downlink beam training signal transmitted via multiple pairs of polarized transmit beams can be a reference signal carried on different time-frequency resources. For example, the reference signal can be a Channel State Information Reference Signal (CSI-RS). The base station 310 can configure a pair of CSI-RS ports corresponding to different CSI-RS resources for the first and second polarized transmit beams in each pair of polarized transmit beams, and transmit the first and second polarized transmit beams via the pair of CSI-RS ports.

[0064] In other embodiments, the downlink beam training signal transmitted via multiple pairs of polarized transmit beams can be different synchronization signal blocks (SSBs).

[0065] User equipment 320 can determine the received power of the first polarized transmit beam and the second polarized transmit beam based on the received signal strength. For example, user equipment 320 can determine the received power of the first polarized transmit beam and the second polarized transmit beam based on the received CSI-RS or SSB signal strength.

[0066] Furthermore, multiple pairs of polarized transmission beams transmitted from base station 310 can be transmitted in different orders. Figure 5A and 5B This is a schematic diagram illustrating the transmission sequence of multiple pairs of polarized transmission beams according to embodiments of the present disclosure. Figure 5A and 5B In the diagram, the beam marked with the number 1 is the first polarization transmission beam, and the beam marked with the number 2 is the second polarization transmission beam.

[0067] exist Figure 5A In this process, base station 310 sequentially transmits each pair of polarized transmission beams from multiple pairs of polarized transmission beams. That is, base station 310 first transmits the first and second polarized transmission beams from one pair of polarized transmission beams, and then transmits the first and second polarized transmission beams from the next pair of polarized transmission beams.

[0068] In this scenario, depending on the number of radio frequency circuits configured for the antennas by the base station 310, the first and second polarized transmit beams of the same pair of polarized transmit beams can be transmitted simultaneously or sequentially. For example, when a pair of cross-polarized antennas are connected to a single radio frequency circuit, the first and second polarized transmit beams of the same pair of polarized transmit beams can be transmitted sequentially. Alternatively, for example, when a pair of cross-polarized antennas are connected to a pair of radio frequency circuits, the first and second polarized transmit beams of the same pair of polarized transmit beams can be transmitted simultaneously.

[0069] In this situation, since the transmission times of the first and second polarized transmit beams in the same pair of polarized transmit beams are the same or similar, the user equipment 320 can determine the cross-polarization ratio of the pair of polarized transmit beams in a timely manner. Furthermore, because the transmission times are the same or similar, the channel conditions experienced by the first and second polarized transmit beams in the same pair of polarized transmit beams are also the same or similar, so the user equipment 320 can determine the cross-polarization ratio of the pair of polarized transmit beams more accurately.

[0070] exist Figure 5B In this process, base station 310 sequentially transmits the first polarization transmit beam from multiple pairs of polarization transmit beams, and then sequentially transmits the second polarization transmit beam from multiple pairs of polarization transmit beams. That is, base station 310 first transmits all the first polarization transmit beams, and then transmits all the second polarization transmit beams.

[0071] Back Figure 4 In step S404, the user equipment 320 selects a polarization transmission beam from multiple pairs of polarization transmission beams. For example, the user equipment 320 can select the polarization transmission beam with the highest received power among the multiple pairs of polarization transmission beams.

[0072] In step S406, the user equipment 320 sends a feedback signal to the base station 310, and the base station 310 receives the feedback signal from the user equipment 320. The feedback signal includes beam identification information of the polarization transmission beam selected by the user equipment 320 and cross-polarization ratio information of the selected polarization transmission beam.

[0073] The beam identification information of the polarization transmit beam is used to identify the polarization transmit beam selected by the user equipment 320. When the base station 310 performs downlink beam training using CSI-RS, the user equipment 320 can feed back the CSI-RS Resource Indication (CRI) as beam identification information. When the base station 310 performs downlink beam training using SSB, the user equipment 320 can feed back the SSB index as beam identification information.

[0074] In some embodiments, the cross-polarization ratio information includes the cross-polarization ratio of the polarized transmit beams selected by the user equipment 320. Herein, the cross-polarization ratio of one polarized transmit beam in a pair of polarized transmit beams refers to the cross-polarization ratio of the entire pair. The cross-polarization ratio of a pair of polarized transmit beams can be determined according to the following formula 1:

[0075]

[0076] In Formula 1, Let m be the downlink cross-polarization ratio of a pair of polarized transmit beams. and These are the downlink channels between the antenna arrays of base station 310 in the first polarization direction and the antenna arrays in the second polarization direction, respectively, and user equipment 320. DL The downlink receiving beam used by user equipment 320 and These are the first and second polarized transmit beams in a pair of polarized transmit beams numbered m. It can be seen that the cross-polarization ratio... In reality, it is the ratio of the received power of the first polarized transmit beam to that of the second polarized transmit beam, or the difference between the RSRP of the first polarized transmit beam and the RSRP of the second polarized transmit beam. The larger the cross-polarization ratio of a pair of polarized transmit beams, the less interference there is between the different polarization directions of the pair of polarized transmit beams, and therefore the better the performance when performing polarization multiplexing.

[0077] In some embodiments, user equipment 320 may not directly feed back the cross-polarization ratio, but instead feed back information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam (e.g., RSRP) as cross-polarization ratio information to base station 310. The polarization transmit beam paired with the selected polarization transmit beam has an indication direction indicated by the beam identification information fed back by user equipment 320, and has a polarization direction that is different from the polarization direction indicated by the beam identification information fed back by user equipment 320, between a first polarization direction and a second polarization direction. Base station 310 can calculate the cross-polarization ratio of the selected polarization transmit beam based on the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam.

[0078] In step S408, base station 310 determines whether the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmit beam. For example, base station 310 can compare the cross-polarization ratio of the selected polarization transmit beam with a polarization threshold, and determine that the selected polarization transmit beam can be used for polarization multiplexing if the cross-polarization ratio of the selected polarization transmit beam is greater than or equal to the polarization threshold. In practice, the cross-polarization ratio of the LoS channel follows a Gaussian distribution with a mean of 9.7 dB and a standard deviation of 6.3 dB. Therefore, to ensure minimal inter-polarization interference, the polarization threshold can be set to 6 dB, meaning the target polarization signal power is four times the interfering polarization signal power.

[0079] In step S410, if the base station 310 determines that the selected polarization transmission beam can be used for polarization multiplexing, polarization multiplexing is performed on the selected polarization transmission beam. That is, the base station 310 sends a polarization-multiplexed signal to the user equipment 320, and the user equipment 320 receives the polarization-multiplexed signal from the base station 310.

[0080] Figure 6 A communication method 600, performed by a base station in a downlink beam training and feedback process according to an embodiment of the present disclosure, is illustrated. Figure 6As shown, in step S602, the base station transmits multiple pairs of polarized transmission beams with different indication directions to the user equipment. Each pair of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam with the same indication direction. The first polarized transmission beam has a first polarization direction. The second polarized transmission beam has a second polarization direction different from the first polarization direction. In step S604, the base station receives a feedback signal from the user equipment. This feedback signal includes beam identification information and cross-polarization ratio information of the polarized transmission beam selected by the user equipment from the multiple pairs of polarized transmission beams. In step S606, the base station determines whether the selected polarized transmission beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarized transmission beam. In step S608, if the selected polarized transmission beam can be used for polarization multiplexing, the base station performs polarization multiplexing on the selected polarized transmission beam.

[0081] Details of steps S602, S604, S606, and S608 have been previously referred to. Figure 4 A detailed description has been provided. For the sake of brevity, it will not be repeated here.

[0082] Figure 7 A communication method 770, performed by a user equipment in a downlink beam training and feedback process according to an embodiment of the present disclosure, is illustrated. Figure 7 As shown, in step S772, the user equipment receives from the base station multiple pairs of polarized transmit beams with different indication directions. Each pair of polarized transmit beams includes a first polarized transmit beam and a second polarized transmit beam with the same indication direction. The first polarized transmit beam has a first polarization direction. The second polarized transmit beam has a second polarization direction different from the first polarization direction. In step S774, the user equipment selects a polarized transmit beam from the multiple pairs of polarized transmit beams. In step S776, the user equipment sends a feedback signal to the base station. The feedback signal includes beam identification information and cross-polarization ratio information of the selected polarized transmit beam. In step S778, if the base station determines that the selected polarized transmit beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarized transmit beam, the user equipment receives from the base station a signal indicating that the selected polarized transmit beam has been polarized multiplexed.

[0083] Details of steps S772, S774, S776, and S778 have been previously referred to. Figure 4 A detailed description has been provided. For the sake of brevity, it will not be repeated here.

[0084] In the downlink beam training and feedback process described above, the base station directly trains the 2M polarization transmit beams, which can obtain the accurate cross-polarization ratio of each pair of polarization transmit beams. However, since the base station requires 2M time-frequency resources to transmit these 2M polarization transmit beams, the overhead of time-frequency resources is relatively large.

[0085] Generally, the downlink and uplink transmissions between the base station and user equipment (UE) have the same polarization characteristics; that is, downlink and uplink transmissions are polarization reciprocal. In other words, if an uplink signal of a certain polarity transmitted by the UE receives high power at the base station, then a downlink signal of the same polarity transmitted by the base station will typically also receive high power at the UE. Polarization reciprocity does not require channel reciprocity between the uplink and downlink channels. Compared to channel reciprocity, polarization reciprocity is a relatively weaker requirement for reciprocity between uplink and downlink channel characteristics. Therefore, both TDD and FDD systems possess polarization reciprocity.

[0086] The following describes a scheme for training uplink and downlink polarization beams based on polarization reciprocity to reduce the overhead of time and frequency resources. Figure 8 This is a flowchart illustrating an uplink and downlink polarized beam training and feedback process 880 according to an embodiment of the present disclosure.

[0087] In step S882, user equipment 320 transmits an uplink beam training signal to perform uplink polarization beam training. The uplink beam training signal can be a reference signal, such as a sounding reference signal (SRS). Base station 310 receives the uplink beam training signal from user equipment 320 through multiple pairs of polarization receiving beams with different indication directions. Each pair of polarization receiving beams includes a first polarization receiving beam and a second polarization receiving beam with the same indication direction. The first polarization receiving beam has a first polarization direction. The second polarization receiving beam has a second polarization direction different from the first polarization direction.

[0088] Base station 310 can receive uplink beam training signals in different sequences through multiple pairs of polarized receiving beams. Similar to the downlink beam training and feedback process 400, base station 310 can first receive uplink beam training signals sequentially through the first polarized receiving beam in the multiple pairs of polarized receiving beams, and then receive uplink beam training signals through the second polarized receiving beam in the multiple pairs of polarized receiving beams.

[0089] Alternatively, base station 310 can sequentially receive uplink beam training signals through each pair of polarized receiving beams in multiple pairs of polarized receiving beams. Figure 9 This is a schematic diagram illustrating uplink polarization receive beam training according to an embodiment of the present disclosure. Figure 9 In the diagram, the beam marked with the number 1 is the first polarization receiving beam, and the beam marked with the number 2 is the second polarization receiving beam. For example... Figure 9As shown, base station 310 receives uplink beam training signals from user equipment 320 sequentially through each pair of polarized receiving beams. That is, base station 310 first receives uplink beam training signals through the first and second polarized receiving beams in one pair of polarized receiving beams, and then receives uplink beam training signals through the first and second polarized receiving beams in the next pair of polarized receiving beams.

[0090] The first and second polarized receiving beams in the same pair of polarized receiving beams can be trained simultaneously or sequentially. Typically, at base station 310, antennas with different polarization directions are connected to different radio frequency circuits; therefore, base station 310 can train beams with two polarization directions simultaneously. In other words, base station 310 can simultaneously receive uplink beam training signals through the first and second polarized receiving beams in a pair of polarized receiving beams.

[0091] Back Figure 8 In step S884, the base station 310 selects a polarization receiving beam from multiple pairs of polarization receiving beams. For example, the base station 310 can select the polarization receiving beam with the highest receiving power among the multiple pairs of polarization receiving beams used.

[0092] Base station 310 can determine the polarization direction of the selected polarization receiving beam and use this polarization direction as the selected polarization direction for the polarization transmitting beam to be sent to user equipment 320 in the subsequent downlink polarization beam training and feedback process. This selected polarization direction is one of the first and second polarization directions. Because uplink and downlink transmissions are polarization reciprocal, the polarization direction of the polarization receiving beam with the highest received power at base station 310 will be closer to the antenna polarization direction of user equipment 320. Therefore, sending a signal with this polarization direction to user equipment 320 can achieve better communication quality.

[0093] In step S886, base station 310 transmits downlink beam training signals to user equipment 320 using multiple polarized transmit beams with different indication directions. That is, base station 310 transmits multiple polarized transmit beams with different indication directions to user equipment 320, and user equipment 320 receives these multiple polarized transmit beams with different indication directions from base station 310. These multiple polarized transmit beams have a selected polarization direction, that is, the polarization direction of the polarized receive beam selected by base station 310, and it is one of a first polarization direction and a second polarization direction.

[0094] In step S888, the user equipment 320 selects a polarization transmission beam from a plurality of polarization transmission beams. For example, the user equipment 320 may select the polarization transmission beam with the highest received power among the plurality of received polarization transmission beams.

[0095] In step S890, base station 310 receives a feedback signal from user equipment 320. This feedback signal includes beam identification information of the polarization transmit beam selected by user equipment 320. The beam identification information of the polarization transmit beam is used to identify the polarization transmit beam selected by user equipment 320. When base station 310 performs downlink beam training using CSI-RS, user equipment 320 can feed back CSI-RS Resource Indication (CRI) as beam identification information. When base station 310 performs downlink beam training using SSB, user equipment 320 can feed back SSB index as beam identification information.

[0096] In step S892, base station 310 determines the cross-polarization ratio of the selected polarization transmit beam indicated by the beam identification information fed back by user equipment 320. In this document, the cross-polarization ratio of one polarization receive beam in a pair of polarization receive beams refers to the cross-polarization ratio of the entire pair of polarization receive beams. There are at least two methods for determining the cross-polarization ratio. The first method is based on polarization reciprocity, using the cross-polarization ratio of the polarization receive beam selected by base station 310 as the cross-polarization ratio of the polarization transmit beam selected by user equipment 320. The second method involves transmitting a polarization transmit beam with a polarization direction not trained in step S886 from base station 310 and obtaining the precise cross-polarization ratio of the polarization transmit beam selected by user equipment 320 based on user feedback. The second method will be referred to later. Figure 10 This will be described in detail. We will first discuss the first method for determining the cross-polarization ratio.

[0097] In the first method of determining the cross-polarization ratio, the base station 310 can determine the cross-polarization ratio of the selected polarization receiving beam according to the following formula 2:

[0098]

[0099] In Formula 2, Let m be the uplink cross-polarization ratio of a pair of polarized receiving beams. and These represent the upper channel between the antenna arrays of base station 310 in the first polarization direction and the antenna arrays in the second polarization direction, respectively, and the user equipment 320. UL The uplink transmission beam used by user equipment 320 and These are the first and second polarized receiving beams in a pair of polarized receiving beams numbered m. It can be seen that the cross-polarization ratio... In reality, it is the ratio of the received power of the first polarized receiving beam to that of the second polarized receiving beam, or the difference between the RSRP of the first polarized receiving beam and the RSRP of the second polarized receiving beam.

[0100] In step S894, base station 310 determines whether the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmit beam. For example, base station 310 can compare the cross-polarization ratio of the selected polarization transmit beam with a polarization threshold, and determine that the selected polarization transmit beam can be used for polarization multiplexing if the cross-polarization ratio of the selected polarization transmit beam is greater than or equal to the polarization threshold. The cross-polarization ratio of the LoS channel follows a Gaussian distribution with a mean of 9.7 dB and a standard deviation of 6.3 dB. Therefore, to ensure minimal inter-polarization interference, the polarization threshold can be set to 6 dB, meaning the target polarization signal power is four times the interfering polarization signal power.

[0101] In step S896, if the base station 310 determines that the selected polarization transmission beam can be used for polarization multiplexing, polarization multiplexing is performed on the selected polarization transmission beam. That is, the base station 310 sends a polarization-multiplexed signal to the user equipment 320, and the user equipment 320 receives the polarization-multiplexed signal from the base station 310. The specific polarization multiplexing method has been described above and will not be repeated here.

[0102] The polarization beam training and feedback process 880 utilizes the polarization reciprocity between uplink and downlink transmissions. In step S886, only one polarization direction of the transmit beam is trained, while the other polarization direction is not trained. Therefore, the number of polarization transmit beams trained in step S886 is reduced, thereby lowering time-frequency resource overhead. However, since it uses the cross-polarization ratio of the receive beam as the cross-polarization ratio of the transmit beam, the estimation of this cross-polarization ratio may contain some errors, potentially leading to cross-polarization interference.

[0103] To obtain a more accurate cross-polarization ratio, base station 310 can adopt a second method for determining the cross-polarization ratio. That is, base station 310 transmits a polarization transmission beam in another polarization direction that was not trained in the downlink polarization beam training and feedback process 880 to obtain a more accurate cross-polarization ratio of the polarization transmission beam.

[0104] The following describes a scheme to obtain a more accurate cross-polarization ratio by training a polarization transmit beam in another polarization direction. Figure 10 This is a flowchart illustrating a polarization beam training and feedback process 1000 according to an embodiment of the present disclosure.

[0105] In step S1002, user equipment 320 transmits an uplink beam training signal to perform uplink polarization beam training, and base station 310 receives the uplink beam training signal from user equipment 320 through multiple pairs of polarization receiving beams with different indication directions. In step S1004, base station 310 selects a polarization receiving beam from the multiple pairs of polarization receiving beams and determines the polarization direction of the selected polarization receiving beam. In step S1006, base station 310 transmits a downlink beam training signal to user equipment 320 through multiple polarization transmitting beams with different indication directions, the polarization direction of these multiple polarization transmitting beams being the same as the polarization direction of the selected polarization receiving beam. In step S1008, user equipment 320 selects a polarization transmitting beam from the multiple polarization transmitting beams. In step S810, base station 310 receives a feedback signal from user equipment 320. The feedback signal includes beam identification information of the polarization transmitting beam selected by user equipment 320. Figure 10 The processing of steps S1002, S1004, S1006, S1008, and S1010 in the process is similar to... Figure 8 The processes in steps S882, S884, S886, S888 and S890 are the same, so their details will not be described here.

[0106] In step S1012, the base station 310 transmits a downlink beam training signal to the user equipment 320 via a polarization transmit beam paired with the selected polarization transmit beam. The polarization transmit beam paired with the selected polarization transmit beam has an indication direction indicated by the beam identification information fed back by the user equipment 320, and has a polarization direction that is different from the polarization direction indicated by the beam identification information fed back by the user equipment 320, which is a first polarization direction and a second polarization direction.

[0107] In step S1014, the user equipment 320 sends a feedback signal to the base station 310, and the base station 310 receives the feedback signal from the user equipment 320. The feedback signal includes cross-polarization ratio information of the selected polarization transmit beam.

[0108] In some embodiments, the cross-polarization ratio information includes the cross-polarization ratio of the selected polarization transmit beam determined by user equipment 320 according to Formula 1. In some embodiments, user equipment 320 may not directly feed back the cross-polarization ratio, but instead feed back information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam (e.g., RSRP) as cross-polarization ratio information to base station 310. Base station 310 may calculate the cross-polarization ratio of the selected polarization transmit beam based on the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam.

[0109] In step S1016, the base station 310 determines whether the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmit beam. For example, the base station 310 can compare the cross-polarization ratio of the selected polarization transmit beam with a polarization threshold, and if the cross-polarization ratio of the selected polarization transmit beam is greater than or equal to the polarization threshold, it determines that the selected polarization transmit beam can be used for polarization multiplexing.

[0110] In step S1018, if the base station 310 determines that the selected polarization transmission beam can be used for polarization multiplexing, polarization multiplexing is performed on the selected polarization transmission beam. That is, the base station 310 sends a polarization-multiplexed signal to the user equipment 320, and the user equipment 320 receives the polarization-multiplexed signal from the base station 310.

[0111] In the downlink polarization beam training and feedback process 1000, the user equipment 320 measures and feeds back the cross-polarization ratio information of the selected polarization transmit beam. Therefore, the base station 310 can obtain the accurate cross-polarization ratio of the selected polarization transmit beam, thereby avoiding cross-polarization interference.

[0112] Figure 11 A communication method 1100 performed by a base station in a downlink beam training and feedback process according to an embodiment of the present disclosure is shown.

[0113] like Figure 11 As shown, in step S1102, the base station receives uplink beam training signals from the user equipment using multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction. The second polarized receiving beam has a second polarization direction different from the first polarization direction.

[0114] In step S1104, the base station selects a polarization receiving beam from multiple pairs of polarization receiving beams and uses the polarization direction of the selected polarization receiving beam as the selected polarization direction.

[0115] In step S1106, the base station transmits multiple polarization transmission beams with different indicated directions to the user equipment. These multiple polarization transmission beams have selected polarization directions.

[0116] In step S1108, the base station receives a feedback signal from the user equipment. This feedback signal includes beam identification information of the polarization transmission beam selected by the user equipment from multiple polarization transmission beams.

[0117] In step S1110, the base station determines the cross-polarization ratio of the selected polarization transmit beam indicated by the beam identification information, and determines whether the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio of the selected polarization transmit beam. In step S1112, if the selected polarization transmit beam can be used for polarization multiplexing, the base station performs polarization multiplexing on the selected polarization transmit beam.

[0118] The details of steps S1102, S1104, S1106, S1108, S1110, and S1112 have been described previously. Figure 8 and 10 A detailed description has been provided. For the sake of brevity, it will not be repeated here.

[0119] Figure 12 A communication method 1200 performed by a user equipment in a beam training and feedback process according to an embodiment of the present disclosure is shown.

[0120] like Figure 12 As shown, in step S1202, the user equipment sends an uplink beam training signal to the base station for selecting a polarization receiving beam from multiple pairs of polarization receiving beams with different indication directions. Each pair of polarization receiving beams includes a first polarization receiving beam and a second polarization receiving beam with the same indication direction. The first polarization receiving beam has a first polarization direction. The second polarization receiving beam has a second polarization direction different from the first polarization direction.

[0121] In step S1204, the user equipment receives multiple polarized transmit beams with different indication directions from the base station. The polarization direction of these multiple polarized transmit beams is the same as the polarization direction of the polarized receive beam selected by the base station.

[0122] In step S1206, the user equipment selects a polarization transmission beam from multiple polarization transmission beams.

[0123] In step S1208, the user equipment sends a feedback signal to the base station. This feedback signal includes beam identification information of the selected polarization transmit beam.

[0124] In step S1210, if the base station determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio of the selected polarization transmit beam indicated by the beam identification information, polarization multiplexing is performed on the selected polarization transmit beam.

[0125] The details of steps S1202, S1204, S1206, S1208, and S1210 have been described previously. Figure 8 and 10 A detailed description has been provided. For the sake of brevity, it will not be repeated here.

[0126] Figure 13 This is a schematic diagram illustrating a base station configuration 1300 according to an embodiment of the present disclosure. Figure 13 As shown, the base station includes a beam transmission unit 1305, a beam measurement unit 1310, a beam selection unit 1315, and a polarization multiplexing unit 1320.

[0127] The beam transmission unit 1305 is used to transmit a polarized transmit beam. The beam measurement unit 1310 is used to measure the received power of the polarized receive beam. The beam selection unit 1315 is used to select a polarized receive beam. The polarization multiplexing unit 1320 is used to determine the cross-polarization ratio of the polarized transmit / receive beams, determine whether polarization multiplexing can be performed based on the cross-polarization ratio, and transmit the polarized multiplexed signal. The details of the operation of the beam transmission unit 1305, beam measurement unit 1310, beam selection unit 1315, and polarization multiplexing unit 1320 have been described in the previous beam training and feedback process and will not be repeated here.

[0128] Figure 14 This is a schematic diagram illustrating a configuration 1400 of a user equipment according to an embodiment of the present disclosure. Figure 14 As shown, the user equipment includes a transmitting unit 1405, a beam measurement unit 1410, a beam selection unit 1415, and a receiving unit 1420.

[0129] Transmitting unit 1405 is used to transmit uplink beam training signals. Beam measurement unit 1410 is used to measure the received power of the polarized transmit beam and determine the cross-polarization ratio of the polarized transmit beam. Beam selection unit 1415 is used to select the polarized transmit beam. Receiving unit 1420 is used to receive the polarized multiplexed signal. The details of the operation of transmitting unit 1405, beam measurement unit 1410, beam selection unit 1415, and receiving unit 1420 have been described in the previous beam training and feedback process and will not be repeated here.

[0130] The above describes an embodiment of determining whether a base station's polarization transmission beam can be used for polarization multiplexing through polarization beam training and feedback. Next, a specific polarization multiplexing method according to embodiments of this disclosure will be described.

[0131] In this paper, polarization multiplexing includes inter-user polarization multiplexing and intra-user polarization multiplexing. Inter-user polarization multiplexing refers to transmitting signals to two user equipments (UEs) using two polarization beams with different polarization directions. These two polarization beams have the same or adjacent direction of indication. Two users can be multiplexed within these two polarization beams through user scheduling. Intra-user polarization multiplexing refers to transmitting two signals to the same UE using two polarization beams with different polarization directions. These two polarization beams have the same direction of indication. In the case of intra-user polarization multiplexing, since the UE needs to receive signals from both polarization directions reliably, it needs to be equipped with a dual-polarized antenna.

[0132] When a user equipment (UE) is configured with a single-polarized antenna, the base station uses only a single polarized transmission beam to send downlink signals to the UE. Therefore, the base station can distinguish downlink signals sent to different UEs by the polarization direction or indication direction of the transmitted beam, such as... Figure 15A , 15B As shown in 15C.

[0133] Figure 15A , 15B Figures 1 and 15C are schematic diagrams illustrating downlink transmission using polarized transmit beams between a base station and two user equipment units. Figure 15A In this context, the polarization direction of the polarization transmission beam used by base station 210 to transmit downlink signals to user equipment 320A and 320B is the same, but the indication direction is different. Figure 15B In this configuration, the polarization direction and indication direction of the polarization transmission beam used by base station 210 to transmit downlink signals to user equipment 320A and 320B are different. Figure 15C In the process, the polarization direction of the polarization transmission beam used by base station 210 to send downlink signals to user equipment 320A and 320B is different, but the indication direction is the same.

[0134] It can be established using the following formula 3. Figure 15A , 15B The downlink multi-user MIMO transmission model using polarized transmit beams in the 15C. Let p represent the downlink channel matrix between the k-th user equipment and the base station, where p k =1,2 represent the polarization direction, and M and N are the number of antennas for the base station and user equipment, respectively. The downlink multi-user MIMO transmission model using polarized transmit beams is as follows:

[0135] For the receive beam vector of user equipment 320, The polarization direction is p k The transmitted beam vector, sk To send symbols, This is the AWGN vector. The second term... This represents interference between users.

[0136] exist Figure 15A middle, p k =p l Therefore, there is inter-user interference between user equipment 320A and 320B. This is inter-beam interference within polarization. Figure 15B middle, p k ≠p l Therefore, there is inter-user interference between user equipment 320A and 320B. This is inter-polarity beam interference. Figure 15C middle, p k ≠p l Therefore, there is inter-user interference between user equipment 320A and 320B. This is inter-polarization interference within the beam.

[0137] In traditional beam-based multi-user MIMO systems, only systems like... Figure 15A Inter-beam interference within the polarization is shown. In user-inter-polarization multiplexing according to embodiments of this disclosure, there exists such... Figure 15B Interpolarity-to-beam interference and such Figure 15C The image shows the interpolarization interference within the beam.

[0138] Typically, when the cross-polarization ratio of a pair of polarized transmit beams is large, the inter-polarization interference and intra-polarization interference generated by the corresponding beams are relatively small. According to some embodiments of this disclosure, multi-user scheduling can be performed based on beam polarization characteristics. For example, when UE 1 and UE 2 select polarized transmit beams with different polarization directions but adjacent or identical indication directions, if the cross-polarization ratios reported by UE 1 and UE 2 are both lower than the polarization threshold at the base station, the base station can pair UE 1 and UE 2 and allow them to be scheduled within the same time-frequency resources.

[0139] Figure 16A and 16B This is a schematic diagram illustrating a traditional multi-user scheduling scheme. Figure 16A In this scenario, four UEs select to transmit beams 1, 2, 3, and 4, respectively. To avoid strong interference between adjacent beams, UE 1 and UE 3 are scheduled in time-frequency resource 1, while UE 2 and UE 4 are scheduled in time-frequency resource 2. Figure 16BIn this scenario, UE 1 and UE 2 select to transmit beam 1, while UE 2 and UE 4 select to transmit beam 3. To avoid strong interference within the same beam, UE 1 and UE 3 are scheduled in time-frequency resource 1, while UE 2 and UE 4 are scheduled in time-frequency resource 2.

[0140] Figure 16C and 16D This is a schematic diagram illustrating multi-user scheduling based on beam polarization characteristics according to an embodiment of the present disclosure. When the cross-polarization ratio of a pair of polarized transmit beams exceeds a polarization threshold, two UEs can be multiplexed in the same time-frequency resources with different polarization directions but adjacent indication directions (e.g., ...). Figure 16C (as shown) or the same indicating direction (e.g. Figure 16D The polarization transmitted within the beam shown is relatively high. Due to the high cross-polarization ratio, the inter-polarization and inter-beam interference caused by polarization multiplexing are relatively small, thereby reducing time-frequency resource overhead and significantly improving the system's spectral efficiency.

[0141] The above describes a scheme for inter-user polarization multiplexing via multi-user scheduling when the user equipment is configured with a single-polarized antenna. The following describes a scheme for transmitting two data streams to a single user via intra-user polarization multiplexing when the user equipment is configured with a dual-polarized antenna.

[0142] When the user equipment is configured with orthogonally polarized antenna arrays, the signal received by the antenna array polarized j (j = 1, 2) on the user side can be expressed as:

[0143] y j =w j H jj f j s j +w j H j′j f j′ s j′ +w j n j (Formula 4).

[0144] Let be the received beam vector of the antenna array with polarization j. Let be the channel matrix between the base station antenna array with polarization j′ and the user antenna array with polarization j. Let w be the transmitted beam vector of a base station antenna array with polarization j. The second term w j H j′j f j′ s j′ This represents the interference of the transmitted signal of polarization j′ on the received signal of polarization j.

[0145] For a single user, the cross-polarization ratio of polarization direction j can be defined as:

[0146]

[0147] According to some embodiments of this disclosure, the average cross-polarization ratio, i.e., (xPR1+xPR2) / 2, can be measured at the user side and fed back to the base station. Alternatively, the base station can calculate the average cross-polarization ratio based on the cross-polarization ratio information fed back by the user equipment. Based on the average cross-polarization ratio, the base station can determine whether the user can perform intra-user polarization multiplexing transmission. When the average cross-polarization ratio is greater than the polarization threshold, it indicates that the interference between different polarizations is small, and the user can perform intra-user polarization multiplexing transmission.

[0148] Furthermore, according to some embodiments of this disclosure, the cross-polarization ratio can be dynamically monitored and updated. Typically, the cross-polarization ratio changes dynamically due to variations in the wireless communication environment or user rotation. Therefore, periodic or non-periodic cross-polarization ratio monitoring and updating are required to ensure that the base station can obtain the real-time cross-polarization ratio of the link.

[0149] In some embodiments of this disclosure, the base station periodically transmits a selected polarization transmit beam and a polarization transmit beam paired with the selected polarization transmit beam according to a cross-polarization ratio monitoring period to monitor the cross-polarization ratio of the selected polarization transmit beam. For example, the base station periodically transmits a downlink beam training signal dedicated to cross-polarization ratio monitoring using the downlink polarization transmit beam in use and its paired polarization transmit beam according to the cross-polarization ratio monitoring period. The user equipment measures the selected polarization transmit beam and its paired polarization transmit beam and feeds back the cross-polarization ratio information to the base station. The cross-polarization ratio monitoring period can be configured by the base station for the user equipment, and its configuration format can be notified to the user in the downlink control information (DCI).

[0150] In some embodiments of this disclosure, when a user equipment detects an event that triggers a change in cross-polarization ratio, it sends a cross-polarization ratio monitoring request to a base station via uplink control information (UCI). After receiving the cross-polarization ratio monitoring request, the base station sends the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam to monitor the cross-polarization ratio of the selected polarization transmit beam.

[0151] Figure 17 This is a graph showing the simulation results of conventional multi-user scheduling and polarization-beam-based multi-user scheduling according to embodiments of this disclosure. Figure 17 In China, the traditional scheme corresponds to Figure 16B The multi-user scheduling scheme of this invention corresponds to... Figure 16D A multi-user scheduling scheme based on polarization beams. For example... Figure 17 As shown, the solution of the present invention can significantly improve the spectral efficiency of the system.

[0152] <3. Application Examples>

[0153] The technology disclosed herein can be applied to a variety of products. For example, base stations and user equipment can both be implemented as various types of computing devices.

[0154] Furthermore, base stations can be implemented as any type of evolved NodeB (eNB), gNB, or TRP (Transmit Receive Point), such as macro eNB / gNB and small eNB / gNB. Small eNB / gNBs can be eNB / gNBs covering cells smaller than macro cells, such as pico eNB / gNBs, micro eNB / gNBs, and femtocell eNB / gNBs. Alternatively, base stations can be implemented as any other type of base station, such as NodeBs and Base Transceiver Stations (BTSs). A base station may include: a subject configured to control wireless communication (also called base station equipment); and one or more remote radio heads (RRHs) located in a different location from the subject. Additionally, the various types of terminals described below can operate as base stations by temporarily or semi-persistently performing base station functions.

[0155] Furthermore, the user equipment can be implemented as a mobile terminal (such as a smartphone, tablet PC, laptop PC, portable gaming terminal, portable / dongle-type mobile router, and digital camera device) or an in-vehicle terminal (such as a car navigation device). The user equipment can also be implemented as a terminal performing machine-to-machine (M2M) communication (also known as a machine-type communication (MTC) terminal). Additionally, the user equipment can be a wireless communication module (such as an integrated circuit module comprising a single chip) installed on each of the aforementioned terminals.

[0156] [3-1. Examples of the application of computing devices]

[0157] Figure 18 This is a block diagram illustrating an example of a schematic configuration of a computing device 700 to which the techniques of this disclosure can be applied. The computing device 700 includes a processor 701, a memory 702, a storage device 703, a network interface 704, and a bus 706.

[0158] The processor 701 may be, for example, a central processing unit (CPU) or a digital signal processor (DSP), and controls the functions of the server 700. The memory 702 includes random access memory (RAM) and read-only memory (ROM), and stores data and programs executed by the processor 701. The storage device 703 may include storage media such as semiconductor memory and hard disks.

[0159] Network interface 704 is a wired communication interface used to connect server 700 to wired communication network 705. Wired communication network 705 can be a core network such as an evolved packet core network (EPC) or a packet data network (PDN) such as the Internet.

[0160] Bus 706 connects processor 701, memory 702, storage device 703, and network interface 704 to each other. Bus 706 may include two or more buses (such as a high-speed bus and a low-speed bus) each with different speeds.

[0161] [3-2. Application Examples of Base Stations]

[0162] (First application example)

[0163] Figure 19 This is a block diagram illustrating a first example of a schematic configuration of a gNB to which the technologies of this disclosure can be applied. The gNB 800 includes one or more antennas 810 and a base station device 820. The base station device 820 and each antenna 810 can be connected to each other via RF cables.

[0164] Each of the antennas 810 includes one or more antenna elements (such as multiple antenna elements included in a multiple-input multiple-output (MIMO) antenna) and is used by the base station equipment 820 to transmit and receive wireless signals. Figure 19 As shown, the gNB 800 may include multiple antennas 810. For example, the multiple antennas 810 may be compatible with multiple frequency bands used by the gNB 800. Although Figure 19 An example is shown in which gNB 800 includes multiple antennas 810, but gNB 800 may also include a single antenna 810.

[0165] The base station equipment 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.

[0166] The controller 821 can be, for example, a CPU or a DSP, and operates various higher-level functions of the base station equipment 820. For example, the controller 821 generates data packets based on data in signals processed by the wireless communication interface 825, and transmits the generated packets via the network interface 823. The controller 821 can bundle data from multiple baseband processors to generate bundled packets and transmit the generated bundled packets. The controller 821 may have logical functions that perform controls such as radio resource control, radio bearer control, mobility management, admission control, and scheduling. This control can be performed in conjunction with nearby gNBs or core network nodes. The memory 822 includes RAM and ROM, and stores programs executed by the controller 821 and various types of control data (such as terminal lists, transmission power data, and scheduling data).

[0167] Network interface 823 is a communication interface used to connect base station equipment 820 to core network 824. Controller 821 can communicate with core network nodes or other gNBs via network interface 823. In this case, gNB 800 and core network nodes or other gNBs can be connected to each other via logical interfaces (such as S1 and X2 interfaces). Network interface 823 can also be a wired communication interface or a wireless communication interface for wireless backhaul. If network interface 823 is a wireless communication interface, it can use a higher frequency band for wireless communication compared to the frequency band used by wireless communication interface 825.

[0168] The wireless communication interface 825 supports any cellular communication scheme (such as LTE and LTE-Advanced) and provides wireless connectivity to terminals located in the cell of gNB 800 via antenna 810. The wireless communication interface 825 typically includes, for example, a baseband (BB) processor 826 and RF circuitry 827. The BB processor 826 can perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various types of signal processing at layers such as L1, Media Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol (PDCP). Instead of controller 821, the BB processor 826 may have some or all of the above-described logical functions. The BB processor 826 may be a memory storing communication control programs, or a module including a processor and associated circuitry configured to execute programs. Updates can change the functionality of the BB processor 826. The module may be a card or blade inserted into a slot in base station equipment 820. Alternatively, the module may be a chip mounted on a card or blade. Meanwhile, the RF circuit 827 may include, for example, a mixer, a filter, and an amplifier, and transmits and receives wireless signals via the antenna 810.

[0169] like Figure 19As shown, the wireless communication interface 825 may include multiple BB processors 826. For example, the multiple BB processors 826 may be compatible with multiple frequency bands used by the gNB 800. Figure 19 As shown, the wireless communication interface 825 may include multiple RF circuits 827. For example, the multiple RF circuits 827 may be compatible with multiple antenna elements. Although Figure 19 An example is shown in which the wireless communication interface 825 includes multiple BB processors 826 and multiple RF circuits 827, but the wireless communication interface 825 may also include a single BB processor 826 or a single RF circuit 827.

[0170] (Second application example)

[0171] Figure 20 This is a block diagram illustrating a second example of a schematic configuration of a gNB to which the technologies of this disclosure can be applied. The gNB 830 includes one or more antennas 840, a base station device 850, and an RRH 860. The RRH 860 and each antenna 840 can be connected to each other via RF cables. The base station device 850 and the RRH 860 can be connected to each other via high-speed lines such as fiber optic cables.

[0172] Each of the antennas 840 includes one or more antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used by the RRH 860 to transmit and receive wireless signals. Figure 20 As shown, the gNB 830 may include multiple antennas 840. For example, the multiple antennas 840 may be compatible with multiple frequency bands used by the gNB 830. Although Figure 20 An example is shown in which gNB 830 includes multiple antennas 840, but gNB 830 may also include a single antenna 840.

[0173] The base station equipment 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, memory 852, and network interface 853 are connected to a reference... Figure 19 The controller 821, memory 822, and network interface 823 described are the same.

[0174] The wireless communication interface 855 supports any cellular communication scheme (such as LTE and LTE-Advanced) and provides wireless communication to terminals located in the sector corresponding to the RRH 860 via the RRH 860 and antenna 840. The wireless communication interface 855 may typically include, for example, a BB processor 856. In addition to the BB processor 856 being connected to the RF circuitry 864 of the RRH 860 via a connection interface 857, the BB processor 856 is connected to the reference... Figure 19 The described BB processor 826 is the same. Figure 20As shown, the wireless communication interface 855 may include multiple BB processors 856. For example, the multiple BB processors 856 may be compatible with multiple frequency bands used by the gNB 830. Although Figure 20 An example is shown in which the wireless communication interface 855 includes multiple BB processors 856, but the wireless communication interface 855 may also include a single BB processor 856.

[0175] Connection interface 857 is an interface for connecting base station device 850 (wireless communication interface 855) to RRH 860. Connection interface 857 can also be a communication module for connecting base station device 850 (wireless communication interface 855) to the aforementioned high-speed line of RRH 860.

[0176] The RRH 860 includes a connectivity interface 861 and a wireless communication interface 863.

[0177] Connection interface 861 is an interface for connecting RRH 860 (wireless communication interface 863) to base station equipment 850. Connection interface 861 can also be a communication module for communication in the aforementioned high-speed line.

[0178] The wireless communication interface 863 transmits and receives wireless signals via antenna 840. The wireless communication interface 863 typically includes, for example, RF circuitry 864. RF circuitry 864 may include, for example, a mixer, a filter, and an amplifier, and transmits and receives wireless signals via antenna 840. Figure 20 As shown, the wireless communication interface 863 may include multiple RF circuits 864. For example, the multiple RF circuits 864 may support multiple antenna elements. Although Figure 20 An example is shown in which the wireless communication interface 863 includes multiple RF circuits 864, but the wireless communication interface 863 may also include a single RF circuit 864.

[0179] [3-3. Application Examples of Terminal Devices]

[0180] (First application example)

[0181] Figure 21 This is a block diagram illustrating an example of a schematic configuration of a smartphone 900 to which the technologies of this disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage device 903, an external connection interface 904, a camera device 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, one or more antenna switches 915, one or more antennas 916, a bus 917, a battery 918, and an auxiliary controller 919.

[0182] The processor 901 can be, for example, a CPU or a system-on-a-chip (SoC), and controls the application layer and other functions of the smartphone 900. The memory 902 includes RAM and ROM, and stores data and programs executed by the processor 901. The storage device 903 can include storage media such as semiconductor memory and hard disks. The external connectivity interface 904 is an interface for connecting external devices, such as memory cards and Universal Serial Bus (USB) devices, to the smartphone 900.

[0183] The camera device 906 includes an image sensor (such as a charge-coupled device (CCD) and complementary metal-oxide-semiconductor (CMOS)) and generates captured images. The sensor 907 may include a set of sensors, such as a measurement sensor, a gyroscope sensor, a magnetometer sensor, and an accelerometer sensor. The microphone 908 converts sound input to the smartphone 900 into an audio signal. The input device 909 includes, for example, a touch sensor, keypad, keyboard, buttons, or switches configured to detect touches on the screen of the display device 910 and receives operations or information input from the user. The display device 910 includes a screen (such as a liquid crystal display (LCD) and an organic light-emitting diode (OLED) display) and displays the output image of the smartphone 900. The speaker 911 converts the audio signal output from the smartphone 900 into sound.

[0184] The wireless communication interface 912 supports any cellular communication scheme (such as LTE and LTE-Advanced) and performs wireless communication. The wireless communication interface 912 typically includes, for example, a BB processor 913 and RF circuitry 914. The BB processor 913 can perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various types of signal processing for wireless communication. Meanwhile, the RF circuitry 914 can include, for example, a mixer, filters, and amplifiers, and transmits and receives wireless signals via an antenna 916. The wireless communication interface 912 can be a single chip module on which the BB processor 913 and RF circuitry 914 are integrated. Figure 21 As shown, the wireless communication interface 912 may include multiple BB processors 913 and multiple RF circuits 914. Although Figure 21 An example is shown in which the wireless communication interface 912 includes multiple BB processors 913 and multiple RF circuits 914, but the wireless communication interface 912 may also include a single BB processor 913 or a single RF circuit 914.

[0185] In addition to cellular communication schemes, the wireless communication interface 912 can support other types of wireless communication schemes, such as short-range wireless communication schemes, near-field communication schemes, and wireless local area network (LAN) schemes. In this case, the wireless communication interface 912 may include a BB processor 913 and RF circuitry 914 for each wireless communication scheme.

[0186] Each of the antenna switches 915 switches the connection destination of the antenna 916 among multiple circuits (e.g., circuits for different wireless communication schemes) included in the wireless communication interface 912.

[0187] Each of the antennas 916 includes one or more antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used by the wireless communication interface 912 to transmit and receive wireless signals. Figure 21 As shown, the smartphone 900 may include multiple antennas 916. Although Figure 21 An example is shown in which the smartphone 900 includes multiple antennas 916, but the smartphone 900 may also include a single antenna 916.

[0188] Furthermore, the smartphone 900 may include an antenna 916 for each wireless communication scheme. In this case, the antenna switch 915 can be omitted from the configuration of the smartphone 900.

[0189] Bus 917 connects processor 901, memory 902, storage device 903, external connection interface 904, camera device 906, sensor 907, microphone 908, input device 909, display device 910, speaker 911, wireless communication interface 912, and auxiliary controller 919 to each other. Battery 918 supplies power to... Figure 21 The various blocks of the smartphone 900 shown are powered, and the feeders are partially shown as dashed lines in the figure. The auxiliary controller 919 operates the minimum necessary functions of the smartphone 900, for example, in sleep mode.

[0190] (Second application example)

[0191] Figure 22 This is a block diagram illustrating an example of a schematic configuration of a car navigation device 920 to which the technology of this disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a Global Positioning System (GPS) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, a wireless communication interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.

[0192] The processor 921 can be, for example, a CPU or a SoC, and controls the navigation functions and other functions of the car navigation device 920. The memory 922 includes RAM and ROM, and stores data and programs executed by the processor 921.

[0193] GPS module 924 uses GPS signals received from GPS satellites to measure the location (such as latitude, longitude, and altitude) of car navigation device 920. Sensor 925 may include a set of sensors, such as a gyroscope sensor, a geomagnetic sensor, and an air pressure sensor. Data interface 926 is connected to, for example, an in-vehicle network 941 via a terminal not shown, and acquires data generated by the vehicle (such as vehicle speed data).

[0194] Content player 927 reproduces content stored on storage media (such as CDs and DVDs), which is inserted into storage media interface 928. Input device 929 includes, for example, a touch sensor, button, or switch configured to detect touch on the screen of display device 930, and receives operations or information input from the user. Display device 930 includes a screen such as an LCD or OLED display and displays images or reproduced content for navigation functions. Speaker 931 outputs sound for navigation functions or reproduced content.

[0195] The wireless communication interface 933 supports any cellular communication scheme (such as LTE and LTE-Advanced) and performs wireless communication. The wireless communication interface 933 typically includes, for example, a BB processor 934 and RF circuitry 935. The BB processor 934 can perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various types of signal processing for wireless communication. Meanwhile, the RF circuitry 935 can include, for example, a mixer, filters, and amplifiers, and transmits and receives wireless signals via an antenna 937. The wireless communication interface 933 can also be a chip module on which the BB processor 934 and RF circuitry 935 are integrated. Figure 22 As shown, the wireless communication interface 933 may include multiple BB processors 934 and multiple RF circuits 935. Although Figure 22 An example is shown in which the wireless communication interface 933 includes multiple BB processors 934 and multiple RF circuits 935, but the wireless communication interface 933 may also include a single BB processor 934 or a single RF circuit 935.

[0196] In addition to cellular communication schemes, the wireless communication interface 933 can support other types of wireless communication schemes, such as short-range wireless communication schemes, near-field communication schemes, and wireless LAN schemes. In this case, for each wireless communication scheme, the wireless communication interface 933 may include a BB processor 934 and an RF circuit 935.

[0197] Each of the antenna switches 936 switches the connection destination of the antenna 937 among multiple circuits (such as circuits for different wireless communication schemes) included in the wireless communication interface 933.

[0198] Each of the antennas 937 includes one or more antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used by the wireless communication interface 933 to transmit and receive wireless signals. Figure 22 As shown, the car navigation device 920 may include multiple antennas 937. Although Figure 22 An example is shown in which the car navigation device 920 includes multiple antennas 937, but the car navigation device 920 may also include a single antenna 937.

[0199] Furthermore, the car navigation device 920 may include an antenna 937 for each wireless communication scheme. In this case, the antenna switch 936 can be omitted from the configuration of the car navigation device 920.

[0200] Battery 938 via feeder to Figure 22 The various blocks of the car navigation device 920 shown are powered, and the feeders are partially shown as dashed lines in the figure. Battery 938 accumulates the power supplied from the vehicle.

[0201] The technology disclosed herein can also be implemented as an in-vehicle system (or vehicle) 940 comprising one or more of the following blocks: a car navigation device 920, an in-vehicle network 941, and a vehicle module 942. The vehicle module 942 generates vehicle data (such as vehicle speed, engine speed, and fault information) and outputs the generated data to the in-vehicle network 941.

[0202] The various illustrative blocks and components described in this disclosure can be implemented or executed using a general-purpose processor, digital signal processor (DSP), ASIC, FPGA, or other programmable logic device designed to perform the functions described herein, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, microcontroller, and / or state machine. The processor may also be implemented as a combination of computing devices, such as a DSP with a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, and / or any other combination of such configurations.

[0203] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on a non-transitory computer-readable medium or transmitted as one or more instructions or code on a non-transitory computer-readable medium. Other examples and implementations are within the scope and spirit of this disclosure and the appended claims. For example, given the nature of software, the functions described above can be performed using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions can also be physically located in various places, including being distributed such that portions of the functions are implemented in different physical locations.

[0204] Furthermore, disclosures of components included within or separate from other components should be considered exemplary, as a variety of other architectures can potentially be implemented to achieve the same functionality, including incorporating all, most, and / or some of the elements as part of one or more single or separate structures.

[0205] A nontransitory computer-readable medium can be any available nontransitory medium that can be accessed by a general-purpose computer or a special-purpose computer. For example, and not limited to, a nontransitory computer-readable medium can include RAM, ROM, EEPROM, flash memory, CD-ROM, DVD or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code components in the form of instructions or data structures, and any other medium that can be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor.

[0206] The preceding description of this disclosure is provided to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but corresponds to the widest scope consistent with the disclosed principles and novel features.

[0207] Embodiments of this disclosure also include:

[0208] 1. A network-side device, comprising processing circuitry, the processing circuitry being configured to:

[0209] Multiple pairs of polarized transmission beams with different indication directions are sent to the terminal-side device. Each pair of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam with the same indication direction. The first polarized transmission beam has a first polarization direction, and the second polarized transmission beam has a second polarization direction different from the first polarization direction.

[0210] The terminal-side device receives a feedback signal, which includes beam identification information and cross-polarization ratio information of the polarization transmission beam selected by the terminal-side device from the plurality of polarization transmission beams.

[0211] Based on the cross-polarization ratio information of the selected polarization transmit beam, it is determined whether the selected polarization transmit beam can be used for polarization multiplexing.

[0212] 2. The network-side device as described in Project 1, wherein determining whether the selected polarization transmit beam can be used for polarization multiplexing includes: comparing the cross-polarization ratio of the selected polarization transmit beam with a polarization threshold, and determining that the selected polarization transmit beam can be used for polarization multiplexing if the cross-polarization ratio of the selected polarization transmit beam is greater than or equal to the polarization threshold.

[0213] 3. The network-side device as described in Project 1, wherein the first polarized transmit beam and the second polarized transmit beam carry reference signals on different time-frequency resources, and the reference signals are used to determine the first received power of the first polarized transmit beam and the second received power of the second polarized transmit beam.

[0214] 4. The network-side device as described in Project 1, wherein the cross-polarization ratio information includes the cross-polarization ratio.

[0215] 5. The network-side device as described in Item 1, wherein the cross-polarization ratio information includes information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam, and the processing circuit is configured to determine the cross-polarization ratio of the selected polarization transmit beam by calculating the ratio of the received power of the selected polarization transmit beam to the received power of the polarization transmit beam paired with the selected polarization transmit beam.

[0216] 6. The network-side device as described in Project 1, wherein the received power of the selected polarized transmit beam at the terminal-side device is higher than the received power of the other polarized transmit beams among the plurality of pairs of polarized transmit beams at the terminal-side device.

[0217] 7. The network-side device as described in Project 1, wherein the plurality of polarized transmission beams are transmitted in the following manner:

[0218] Each pair of polarized transmission beams is transmitted sequentially; or

[0219] The first polarized transmit beam with the first polarization direction is transmitted from the plurality of polarized transmit beams, and then the second polarized transmit beam with the second polarization direction is transmitted from the plurality of polarized transmit beams.

[0220] 8. The network-side device as described in Project 1, wherein, when the processing circuit determines that the selected polarization transmit beam can be used for polarization multiplexing, it transmits data signals to the terminal-side device and another terminal-side device respectively through the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam in the same time-frequency resources, or transmits data signals to the terminal-side device and the other terminal-side device respectively through the selected polarization transmit beam and the polarization transmit beam having an adjacent indication direction to the selected polarization transmit beam in the same time-frequency resources.

[0221] 9. The network-side device as described in Project 1, wherein the processing circuit is configured as follows:

[0222] If it is determined that the selected polarization transmit beam can be used for polarization multiplexing, the first signal and the second signal are transmitted to the terminal-side device in the same time-frequency resources through the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam, respectively.

[0223] 10. The network-side device as described in Project 1, wherein the processing circuit is configured to:

[0224] The selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam are periodically transmitted according to the cross-polarization ratio monitoring period to monitor the cross-polarization ratio of the selected polarization transmit beam.

[0225] 11. The network-side device as described in item 10, wherein the processing circuit is further configured to:

[0226] The cross-polarization ratio monitoring period is set, and the cross-polarization ratio monitoring period is sent to the terminal-side device.

[0227] 12. The network-side device as described in Project 1, wherein the processing circuit is further configured to:

[0228] Upon receiving a cross-polarization ratio monitoring request from the terminal-side device, the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam are transmitted to monitor the cross-polarization ratio of the selected polarization transmit beam.

[0229] 13. The network-side device as described in Project 1, wherein the first polarization direction is the +45-degree antenna polarization direction of the network-side device, and the second polarization direction is the -45-degree antenna polarization direction of the network-side device.

[0230] 14. A terminal-side device, comprising a processing circuit, the processing circuit being configured to:

[0231] Receive multiple pairs of polarized transmit beams with different indication directions from network-side devices. Each pair of polarized transmit beams includes a first polarized transmit beam and a second polarized transmit beam with the same indication direction. The first polarized transmit beam has a first polarization direction, and the second polarized transmit beam has a second polarization direction different from the first polarization direction.

[0232] Select a polarization transmission beam from the plurality of polarization transmission beams;

[0233] Sending a feedback signal to the network-side device, the feedback signal including beam identification information and cross-polarization ratio information of the selected polarization transmit beam; and

[0234] When the network-side device determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmit beam, it receives from the network-side device a signal that has polarization multiplexed the selected polarization transmit beam.

[0235] 15. The terminal-side device as described in Item 14, wherein the first polarized transmit beam and the second polarized transmit beam carry reference signals on different time-frequency resources, and the terminal-side device determines a first received power of the first polarized transmit beam and a second received power of the second polarized transmit beam based on the reference signals.

[0236] 16. The terminal-side device as described in Item 14, wherein the cross-polarization ratio information of the selected polarization transmit beam includes at least one of the following:

[0237] The cross-polarization ratio of the selected polarization transmit beam; or

[0238] Information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam.

[0239] 17. The terminal-side device as described in item 14, wherein the received power of the selected polarized transmit beam at the terminal-side device is higher than the received power of the other polarized transmit beams among the plurality of pairs of polarized transmit beams at the terminal-side device.

[0240] 18. The terminal-side device as described in Item 14, wherein the plurality of polarized transmission beams are received in the following manner:

[0241] Sequentially receive each pair of polarized transmission beams from the plurality of polarized transmission beams; or

[0242] The system receives the first polarized transmit beam with the first polarization direction from among the multiple pairs of polarized transmit beams, and then receives the second polarized transmit beam with the second polarization direction from among the multiple pairs of polarized transmit beams.

[0243] 19. A communication method, comprising:

[0244] Multiple pairs of polarized transmission beams with different indication directions are sent to the terminal-side device. Each pair of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam with the same indication direction. The first polarized transmission beam has a first polarization direction, and the second polarized transmission beam has a second polarization direction different from the first polarization direction.

[0245] The terminal-side device receives a feedback signal, which includes beam identification information and cross-polarization ratio information of the polarization transmission beam selected by the terminal-side device from the plurality of polarization transmission beams.

[0246] Based on the cross-polarization ratio information of the selected polarization transmit beam, it is determined whether the selected polarization transmit beam can be used for polarization multiplexing.

[0247] 20. A communication method, comprising:

[0248] Receive multiple pairs of polarized transmit beams with different indication directions from network-side devices. Each pair of polarized transmit beams includes a first polarized transmit beam and a second polarized transmit beam with the same indication direction. The first polarized transmit beam has a first polarization direction, and the second polarized transmit beam has a second polarization direction different from the first polarization direction.

[0249] Select a polarization transmission beam from the plurality of polarization transmission beams;

[0250] Sending a feedback signal to the network-side device, the feedback signal including beam identification information and cross-polarization ratio information of the selected polarization transmit beam; and

[0251] When the network-side device determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmit beam, it receives from the network-side device a signal that has polarization multiplexed the selected polarization transmit beam.

[0252] 21. A network-side device, comprising processing circuitry, the processing circuitry being configured to:

[0253] The uplink beam training signal from the terminal device is received by multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction different from the first polarization direction.

[0254] Select a polarization receiving beam from the multiple pairs of polarization receiving beams, and use the polarization direction of the selected polarization receiving beam as the selected polarization direction.

[0255] Multiple polarized transmission beams with different indicated directions are transmitted to the terminal-side device, the multiple polarized transmission beams having the selected polarization direction;

[0256] The terminal-side device receives a feedback signal, the feedback signal including beam identification information of the polarization transmission beam selected by the terminal-side device from the plurality of polarization transmission beams; and

[0257] The cross-polarization ratio of the selected polarization transmit beam, as indicated by the beam identification information, is determined, and whether the selected polarization transmit beam can be used for polarization multiplexing is determined based on the cross-polarization ratio of the selected polarization transmit beam.

[0258] 22. The network-side device as described in item 21, wherein determining whether the selected polarization transmit beam can be used for polarization multiplexing includes: comparing the cross-polarization ratio of the selected polarization transmit beam with a polarization threshold, and determining that the selected polarization transmit beam can be used for polarization multiplexing if the cross-polarization ratio of the selected polarization transmit beam is greater than or equal to the polarization threshold.

[0259] 23. The network-side device as described in item 21, wherein determining the cross-polarization ratio of the selected polarization transmit beam includes:

[0260] The cross-polarization ratio of the selected polarization receiving beam is determined, and the cross-polarization ratio of the selected polarization receiving beam is used as the cross-polarization ratio of the selected polarization transmitting beam.

[0261] Determining the cross-polarization ratio of the selected polarization receiving beam includes: determining the ratio of the received power of the selected polarization receiving beam to the received power of the polarization receiving beam paired with the selected polarization receiving beam.

[0262] 24. The network-side device as described in item 21, wherein determining the cross-polarization ratio of the selected polarization transmit beam includes:

[0263] Send a polarization transmission beam that is paired with the selected polarization transmission beam to the terminal-side device;

[0264] Receive cross-polarization ratio information of the selected polarization transmit beam from the terminal side device.

[0265] 25. The network-side device as described in item 24, wherein the cross-polarization ratio information includes the cross-polarization ratio.

[0266] 26. The network-side device as described in item 24, wherein the cross-polarization ratio information includes information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam, and the processing circuitry is further configured to determine the cross-polarization ratio of the selected polarization transmit beam by calculating the ratio of the received power of the selected polarization transmit beam to the received power of the polarization transmit beam paired with the selected polarization transmit beam.

[0267] 27. The network-side device as described in item 21, wherein the received power of the selected polarized receiving beam at the network-side device is higher than the received power of the other polarized receiving beams among the plurality of pairs of polarized receiving beams at the network-side device.

[0268] 28. The network-side device as described in item 21, wherein the received power of the selected polarized transmit beam at the terminal-side device is higher than the received power of the other polarized transmit beams among the plurality of polarized transmit beams at the terminal-side device.

[0269] 29. A terminal-side device, comprising processing circuitry, the processing circuitry being configured to:

[0270] Uplink beam training signals are sent to network-side devices for selecting polarized receiving beams from multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction different from the first polarization direction.

[0271] The network-side device receives multiple polarized transmit beams with different indication directions, the polarization direction of the multiple polarized transmit beams being the same as the polarization direction of the polarized receive beam selected by the network-side device.

[0272] Select a polarization transmission beam from the plurality of polarization transmission beams;

[0273] Sending a feedback signal to the network-side device, the feedback signal including beam identification information of the selected polarization transmit beam; and

[0274] When the network-side device determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio of the selected polarization transmit beam indicated by the beam identification information, it receives the polarization-multiplexed signal from the network-side device.

[0275] 30. The terminal-side device as described in Item 29 is configured as follows:

[0276] Receives a polarization transmit beam paired with the selected polarization transmit beam from the network-side device;

[0277] The cross-polarization ratio information of the selected polarization transmit beam is determined based on the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam.

[0278] 31. The terminal-side device as described in item 30, wherein the cross-polarization ratio information of the selected polarization transmit beam includes at least one of the following:

[0279] The cross-polarization ratio of the selected polarization transmit beam; or

[0280] Information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam.

[0281] 32. The terminal-side device as described in item 29, wherein the received power of the selected polarized transmit beam at the terminal-side device is higher than the received power of the other polarized transmit beams among the plurality of polarized transmit beams at the terminal-side device.

[0282] 33. A communication method, comprising:

[0283] The uplink beam training signal from the terminal device is received by multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction different from the first polarization direction.

[0284] Select a polarization receiving beam from the multiple pairs of polarization receiving beams, and use the polarization direction of the selected polarization receiving beam as the selected polarization direction.

[0285] Multiple polarized transmission beams with different indicated directions are transmitted to the terminal-side device, the multiple polarized transmission beams having the selected polarization direction;

[0286] The terminal-side device receives a feedback signal, the feedback signal including beam identification information of the polarization transmission beam selected by the terminal-side device from the plurality of polarization transmission beams; and

[0287] The cross-polarization ratio of the selected polarization transmit beam, as indicated by the beam identification information, is determined, and whether the selected polarization transmit beam can be used for polarization multiplexing is determined based on the cross-polarization ratio of the selected polarization transmit beam.

[0288] 34. A communication method, comprising:

[0289] Uplink beam training signals are sent to network-side devices for selecting polarized receiving beams from multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction different from the first polarization direction.

[0290] The network-side device receives multiple polarized transmit beams with different indication directions, the polarization direction of the multiple polarized transmit beams being the same as the polarization direction of the polarized receive beam selected by the network-side device.

[0291] Select a polarization transmission beam from the plurality of polarization transmission beams;

[0292] Sending a feedback signal to the network-side device, the feedback signal including beam identification information of the selected polarization transmit beam; and

[0293] When the network-side device determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio of the selected polarization transmit beam indicated by the beam identification information, it performs polarization multiplexing on the selected polarization transmit beam.

[0294] 35. A non-transitory computer-readable storage medium having instructions stored thereon, which, when executed by a processor, cause the processor to perform the communication method described in any one of items 19, 20, 33, and 34.

[0295] 36. A communication apparatus comprising components for performing the steps of the communication method described in any one of items 19, 20, 33, and 34.

Claims

1. A network-side device, comprising processing circuitry, the processing circuitry being configured to: Multiple pairs of polarized transmission beams with different indication directions are sent to the terminal-side device. Each pair of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam with the same indication direction. The first polarized transmission beam has a first polarization direction, and the second polarized transmission beam has a second polarization direction different from the first polarization direction. The terminal-side device receives a feedback signal, which includes beam identification information and cross-polarization ratio information of the polarization transmit beam selected by the terminal-side device from the plurality of pairs of polarization transmit beams. The cross-polarization ratio information is used to characterize the difference in received power for the first polarization transmit beam and the second polarization transmit beam at the terminal-side device. Based on the cross-polarization ratio information of the selected polarization transmit beam, it is determined whether the selected polarization transmit beam can be used for polarization multiplexing.

2. The network-side device as described in claim 1, wherein, Determining whether a selected polarization transmit beam can be used for polarization multiplexing includes: comparing the cross-polarization ratio of the selected polarization transmit beam with a polarization threshold, and determining that the selected polarization transmit beam can be used for polarization multiplexing if the cross-polarization ratio of the selected polarization transmit beam is greater than or equal to the polarization threshold.

3. The network-side device as described in claim 1, wherein, The first polarized transmit beam and the second polarized transmit beam carry reference signals on different time-frequency resources. The reference signals are used to determine the first received power of the first polarized transmit beam and the second received power of the second polarized transmit beam.

4. The network-side device as described in claim 1, wherein, The cross-polarization ratio information includes the cross-polarization ratio.

5. The network-side device as described in claim 1, wherein, The cross-polarization ratio information includes information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam, and the processing circuit is configured to determine the cross-polarization ratio of the selected polarization transmit beam by calculating the ratio of the received power of the selected polarization transmit beam to the received power of the polarization transmit beam paired with the selected polarization transmit beam.

6. The network-side device as described in claim 1, wherein, The selected polarization transmit beam has a higher received power at the terminal-side device than the other polarization transmit beams in the plurality of polarization transmit beam pairs at the terminal-side device.

7. The network-side device as described in claim 1, wherein, The multiple pairs of polarized transmission beams are transmitted in the following manner: Each pair of polarized transmission beams is transmitted sequentially; or The first polarized transmit beam with the first polarization direction is transmitted from the plurality of polarized transmit beams, and then the second polarized transmit beam with the second polarization direction is transmitted from the plurality of polarized transmit beams.

8. The network-side device as described in claim 1, wherein, When the processing circuit determines that the selected polarization transmit beam can be used for polarization multiplexing, it transmits data signals to the terminal-side device and another terminal-side device respectively through the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam in the same time-frequency resources; or it transmits data signals to the terminal-side device and the other terminal-side device respectively through the selected polarization transmit beam and the polarization transmit beam having an adjacent indication direction to the selected polarization transmit beam in the same time-frequency resources.

9. The network-side device as claimed in claim 1, wherein the processing circuit is configured to: If it is determined that the selected polarization transmit beam can be used for polarization multiplexing, the first signal and the second signal are transmitted to the terminal-side device in the same time-frequency resources through the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam, respectively.

10. The network-side device as claimed in claim 1, wherein, The processing circuit is configured as follows: The selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam are periodically transmitted according to the cross-polarization ratio monitoring period to monitor the cross-polarization ratio of the selected polarization transmit beam.

11. The network-side device as claimed in claim 10, wherein, The processing circuit is further configured to: The cross-polarization ratio monitoring period is set, and the cross-polarization ratio monitoring period is sent to the terminal-side device.

12. The network-side device as claimed in claim 1, wherein, The processing circuit is further configured to: Upon receiving a cross-polarization ratio monitoring request from the terminal-side device, the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam are transmitted to monitor the cross-polarization ratio of the selected polarization transmit beam.

13. The network-side device as described in claim 1, wherein, The first polarization direction is the +45-degree antenna polarization direction of the network-side device, and the second polarization direction is the -45-degree antenna polarization direction of the network-side device.

14. A terminal-side device, comprising a processing circuit, the processing circuit being configured to: Receive multiple pairs of polarized transmit beams with different indication directions from network-side devices. Each pair of polarized transmit beams includes a first polarized transmit beam and a second polarized transmit beam with the same indication direction. The first polarized transmit beam has a first polarization direction, and the second polarized transmit beam has a second polarization direction different from the first polarization direction. Select a polarization transmission beam from the plurality of polarization transmission beams; Send a feedback signal to the network-side device. The feedback signal includes beam identification information and cross-polarization ratio information of the selected polarization transmit beam, wherein the cross-polarization ratio information is used to characterize the difference in received power at the terminal-side device for the first polarization transmit beam and the second polarization transmit beam. as well as When the network-side device determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmit beam, it receives from the network-side device a signal that has polarization multiplexed the selected polarization transmit beam.

15. The terminal-side device as described in claim 14, wherein, The first polarized transmit beam and the second polarized transmit beam carry reference signals on different time-frequency resources. The terminal-side device determines the first received power of the first polarized transmit beam and the second received power of the second polarized transmit beam based on the reference signals.

16. The terminal-side device as described in claim 14, wherein, The cross-polarization ratio information of the selected polarization transmit beam includes at least one of the following: The cross-polarization ratio of the selected polarization transmit beam; or Information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam.

17. The terminal-side device as described in claim 14, wherein, The selected polarization transmit beam has a higher received power at the terminal-side device than the other polarization transmit beams in the plurality of polarization transmit beam pairs at the terminal-side device.

18. The terminal-side device as described in claim 14, wherein, The multiple pairs of polarized transmission beams are received in the following manner: Sequentially receive each pair of polarized transmission beams from the plurality of polarized transmission beams; or The system receives the first polarized transmit beam with the first polarization direction from among the multiple pairs of polarized transmit beams, and then receives the second polarized transmit beam with the second polarization direction from among the multiple pairs of polarized transmit beams.

19. A communication method, comprising: Multiple pairs of polarized transmission beams with different indication directions are sent to the terminal-side device. Each pair of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam with the same indication direction. The first polarized transmission beam has a first polarization direction, and the second polarized transmission beam has a second polarization direction different from the first polarization direction. The terminal-side device receives a feedback signal, which includes beam identification information and cross-polarization ratio information of the polarization transmit beam selected by the terminal-side device from the plurality of pairs of polarization transmit beams. The cross-polarization ratio information is used to characterize the difference in received power for the first polarization transmit beam and the second polarization transmit beam at the terminal-side device. Based on the cross-polarization ratio information of the selected polarization transmit beam, it is determined whether the selected polarization transmit beam can be used for polarization multiplexing.

20. A communication method, comprising: Receive multiple pairs of polarized transmit beams with different indication directions from network-side devices. Each pair of polarized transmit beams includes a first polarized transmit beam and a second polarized transmit beam with the same indication direction. The first polarized transmit beam has a first polarization direction, and the second polarized transmit beam has a second polarization direction different from the first polarization direction. Select a polarization transmission beam from the plurality of polarization transmission beams; Send a feedback signal to the network-side device. The feedback signal includes beam identification information and cross-polarization ratio information of the selected polarization transmit beam, wherein the cross-polarization ratio information is used to characterize the difference in received power at the terminal-side device for the first polarization transmit beam and the second polarization transmit beam. as well as When the network-side device determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmit beam, it receives from the network-side device a signal that has polarization multiplexed the selected polarization transmit beam.

21. A network-side device, comprising processing circuitry, the processing circuitry being configured to: The uplink beam training signal from the terminal device is received by multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction different from the first polarization direction. Select a polarization receiving beam from the multiple pairs of polarization receiving beams, and use the polarization direction of the selected polarization receiving beam as the selected polarization direction. Multiple polarized transmission beams with different indicated directions are transmitted to the terminal-side device, the multiple polarized transmission beams having the selected polarization direction; The terminal-side device receives a feedback signal, which includes beam identification information of the polarization transmission beam selected by the terminal-side device from the plurality of polarization transmission beams. as well as The cross-polarization ratio of the selected polarization transmit beam, indicated by the beam identification information, is determined, and whether the selected polarization transmit beam can be used for polarization multiplexing is determined based on the cross-polarization ratio of the selected polarization transmit beam, wherein the cross-polarization ratio is used to characterize the difference in received power for the first polarization transmit beam and the second polarization transmit beam at the terminal-side device.

22. The network-side device as claimed in claim 21, wherein, Determining whether a selected polarization transmit beam can be used for polarization multiplexing includes: comparing the cross-polarization ratio of the selected polarization transmit beam with a polarization threshold, and determining that the selected polarization transmit beam can be used for polarization multiplexing if the cross-polarization ratio of the selected polarization transmit beam is greater than or equal to the polarization threshold.

23. The network-side device as described in claim 21, wherein, Determining the cross-polarization ratio of the selected polarization transmit beam includes: The cross-polarization ratio of the selected polarization receiving beam is determined, and the cross-polarization ratio of the selected polarization receiving beam is used as the cross-polarization ratio of the selected polarization transmitting beam. Determining the cross-polarization ratio of the selected polarization receiving beam includes: determining the ratio of the received power of the selected polarization receiving beam to the received power of the polarization receiving beam paired with the selected polarization receiving beam.

24. The network-side device as claimed in claim 21, wherein, Determining the cross-polarization ratio of the selected polarization transmit beam includes: Send a polarization transmission beam that is paired with the selected polarization transmission beam to the terminal-side device; Receive cross-polarization ratio information of the selected polarization transmit beam from the terminal side device.

25. The network-side device as described in claim 24, wherein, The cross-polarization ratio information includes the cross-polarization ratio.

26. The network-side device as described in claim 24, wherein, The cross-polarization ratio information includes information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam, and the processing circuit is further configured to determine the cross-polarization ratio of the selected polarization transmit beam by calculating the ratio of the received power of the selected polarization transmit beam to the received power of the polarization transmit beam paired with the selected polarization transmit beam.

27. The network-side device as claimed in claim 21, wherein, The selected polarization receiving beam has a higher receiving power at the network-side device than the other polarization receiving beams in the plurality of polarization receiving beam pairs at the network-side device.

28. The network-side device as claimed in claim 21, wherein, The selected polarization transmit beam has a higher received power at the terminal-side device than the other polarization transmit beams among the plurality of polarization transmit beams at the terminal-side device.

29. A terminal-side device, comprising processing circuitry, the processing circuitry being configured to: Uplink beam training signals are sent to network-side devices for selecting polarized receiving beams from multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction different from the first polarization direction. The network-side device receives multiple polarized transmit beams with different indication directions, the polarization direction of the multiple polarized transmit beams being the same as the polarization direction of the polarized receive beam selected by the network-side device. Select a polarization transmission beam from the plurality of polarization transmission beams; Send a feedback signal to the network-side device, the feedback signal including beam identification information of the selected polarization transmission beam; as well as When the network-side device determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio of the selected polarization transmit beam indicated by the beam identification information, it receives a polarization-multiplexed signal from the network-side device, wherein the cross-polarization ratio is used to characterize the difference in received power for the first polarization transmit beam and the second polarization transmit beam at the terminal-side device.

30. The terminal-side device as described in claim 29, configured to: Receives a polarization transmit beam paired with the selected polarization transmit beam from the network-side device; The cross-polarization ratio information of the selected polarization transmit beam is determined based on the selected polarization transmit beam and the polarization transmit beam paired with the selected polarization transmit beam.

31. The terminal-side device as described in claim 30, wherein, The cross-polarization ratio information of the selected polarization transmit beam includes at least one of the following: The cross-polarization ratio of the selected polarization transmit beam; or Information indicating the received power of the selected polarization transmit beam and the received power of the polarization transmit beam paired with the selected polarization transmit beam.

32. The terminal-side device as described in claim 29, wherein, The selected polarization transmit beam has a higher received power at the terminal-side device than the other polarization transmit beams among the plurality of polarization transmit beams at the terminal-side device.

33. A communication method, comprising: The uplink beam training signal from the terminal device is received by multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction different from the first polarization direction. Select a polarization receiving beam from the multiple pairs of polarization receiving beams, and use the polarization direction of the selected polarization receiving beam as the selected polarization direction. Multiple polarized transmission beams with different indicated directions are transmitted to the terminal-side device, the multiple polarized transmission beams having the selected polarization direction; The terminal-side device receives a feedback signal, which includes beam identification information of the polarization transmission beam selected by the terminal-side device from the plurality of polarization transmission beams. as well as The cross-polarization ratio of the selected polarization transmit beam, indicated by the beam identification information, is determined, and whether the selected polarization transmit beam can be used for polarization multiplexing is determined based on the cross-polarization ratio of the selected polarization transmit beam, wherein the cross-polarization ratio is used to characterize the difference in received power for the first polarization transmit beam and the second polarization transmit beam at the terminal-side device.

34. A communication method, comprising: Uplink beam training signals are sent to network-side devices for selecting polarized receiving beams from multiple pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam with the same indication direction. The first polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction different from the first polarization direction. The network-side device receives multiple polarized transmit beams with different indication directions, the polarization direction of the multiple polarized transmit beams being the same as the polarization direction of the polarized receive beam selected by the network-side device. Select a polarization transmission beam from the plurality of polarization transmission beams; Send a feedback signal to the network-side device, the feedback signal including beam identification information of the selected polarization transmission beam; as well as When the network-side device determines that the selected polarization transmit beam can be used for polarization multiplexing based on the cross-polarization ratio of the selected polarization transmit beam indicated by the beam identification information, polarization multiplexing is performed on the selected polarization transmit beam, wherein the cross-polarization ratio is used to characterize the difference in received power at the terminal-side device for the first polarization transmit beam and the second polarization transmit beam.

35. A non-transitory computer-readable storage medium having instructions stored thereon, the instructions, when executed by a processor, causing the processor to perform the communication method according to any one of claims 19, 20, 33, and 34.

36. A communication apparatus comprising components for performing the steps of the communication method according to any one of claims 19, 20, 33, and 34.

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