WO2021088797A1

WO2021088797A1 - Network side device, terminal side device, communication method, communication apparatus and medium

Info

Publication number: WO2021088797A1
Application number: PCT/CN2020/126127
Authority: WO
Inventors: 刘文东; 王昭诚; 曹建飞
Original assignee: 索尼公司; 刘文东
Priority date: 2019-11-08
Filing date: 2020-11-03
Publication date: 2021-05-14
Also published as: CN114616765A; CN112787697A

Abstract

Provided are a network side device, a terminal side device, a communication method, a communication apparatus and a medium. The network side device comprises a processing circuit, and the processing circuit is configured to: send a plurality of pairs of polarized sending beams having different indication directions to a terminal side network, wherein each pair of polarized sending beams in the plurality of pairs of polarized sending beams comprises a first polarized sending beam and a second polarized sending beam that have the same indication direction, the first polarized sending beam has a first polarization direction, and the second polarized sending beam has a second polarization direction that differs from the first polarization direction; receive a feedback signal from the terminal side device, wherein the feedback signal comprises beam identification information and cross-polarization ratio information of polarized sending beams selected from among the plurality of pairs of polarized sending beams by the terminal side device; and determine, on the basis of the cross-polarization ratio information of the selected polarized sending beams, whether the selected polarized sending beams can be used for polarization multiplexing.

Description

Network side equipment, terminal side equipment, communication method, communication device and medium

Priority statement

This application claims the priority of a Chinese patent application filed on November 8, 2019, with application number 201911090031.X, and the title of the invention "network side equipment, terminal side equipment, communication method, communication device, and medium". The entire content of the application is approved The reference is incorporated into this article.

Technical field

The present disclosure relates to the field of wireless communication, and in particular, to network-side equipment, terminal-side equipment, communication methods, and media for wireless communication.

Background technique

Electromagnetic waves have different polarization modes, including linear polarization (as shown in Figure 1A) and elliptical polarization (as shown in Figure 1B). 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 (as shown in Figure 2). Elliptical polarization includes left-handed polarization and right-handed polarization. Circular polarization is a special case of elliptical polarization. The ±45° polarized Uniform Planar Array (UPA) as shown in Figure 2 can provide orthogonal polarization channels for polarization diversity or multiplexing. In fact, for signals of lower frequency bands (for example, sub-6GHz), due to abundant reflection and scattering, the polarization characteristics of electromagnetic waves will be changed during the propagation process, so the polarization characteristics are not significant at the receiving end. Therefore, the user terminal usually uses a vertically polarized antenna to receive the ±45° polarized signal sent by the base station. However, for higher frequency signals (for example, millimeter waves above 6GHz), since they are dominated by Line-of-Sight (LoS) signals, polarized signals experience less reflection and Scattering, the polarization characteristics of the signal at the receiving end are still relatively significant, and basically consistent with the transmitting end. Therefore, for high-frequency signals, users need to perform polarization matching with the base station to obtain the maximum beamforming gain. When the base station and the user use the same polarization mode, the beamforming gain is maximized. When the base station and the user adopt different polarization modes, the polarization mismatch will significantly reduce the beamforming gain received by the user. Therefore, in beam management, the introduction of polarization characteristics of different beams requires further research.

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

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

Currently in the Release 16 version of the 3GPP protocol, the beam selection scheme based on the signal-to-interference plus noise ratio (L1-SINR) of layer 1 is widely discussed to reduce the inter-beam interference that may be encountered in the data transmission phase of multi-user MIMO The larger case. Through additional configuration of channel state information reference signal (CSI-RS) resources dedicated to inter-beam interference measurement, in the case of multiple users, users measure and report the SINR of different beams, and the base station reports the SINR of different beams based on multiple users. Under the circumstances, beam configuration is performed to maximize system performance.

However, in the L1-SINR-based solution, additional CSI-RS overhead is required, and the system implementation is very complicated. In addition, this solution does not consider the polarization characteristics of different beams, so the degree of freedom of polarization cannot be effectively utilized.

Summary of the invention

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

According to an aspect of the present disclosure, there is provided a network-side device, including a processing circuit configured to send multiple pairs of polarization transmission beams with different indication directions to the terminal-side device, the multiple pairs of polarization transmission beams Each pair of polarized transmit beams in the 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 first polarization direction. The polarized transmission beam has a second polarization direction that is different from the first polarization direction; a feedback signal is received from the terminal-side device, and the feedback signal includes transmission by the terminal-side device from the multiple pairs of polarizations. The beam identification information and cross-polarization ratio information of the polarized transmission beam selected in the beam; based on the cross-polarization ratio information of the selected polarized transmission beam, it is determined whether the selected polarized transmission beam can be used for polarization multiplexing .

According to another aspect of the present disclosure, there is provided a terminal-side device including a processing circuit configured to receive multiple pairs of polarized transmission beams with different indication directions from the network-side device, and the multiple pairs of polarized transmission beams Each pair of polarization transmission beams in the polarization transmission beam includes a first polarization transmission beam and a second polarization transmission beam having the same indication direction, the first polarization transmission beam has a first polarization direction, and the first polarization transmission beam has a first polarization direction. The two-polarization transmission beam has a second polarization direction different from the first polarization direction; the polarization transmission beam is selected from the multiple pairs of polarization transmission beams; and the feedback signal is sent to the network side device, the The feedback signal includes the beam identification information and cross-polarization ratio information of the selected polarization transmission beam; and the network side device determines the selected polarization transmission beam based on the cross-polarization ratio information of the selected polarization transmission beam If it can be used for polarization multiplexing, a signal obtained by polarization multiplexing the selected polarization transmission beam is received from the network side device.

According to another aspect of the present disclosure, there is provided a communication method, including: transmitting a plurality of pairs of polarized transmission beams with different indication directions to a terminal side device, each pair of polarized transmission beams in the plurality of pairs of polarized transmission beams The beam includes a first polarization transmission beam and a second polarization transmission beam having the same indication direction, the first polarization transmission beam has a first polarization direction, and the second polarization transmission beam has the same direction as the first polarization transmission beam. A second polarization direction with a different polarization direction;

Receive a feedback signal from the terminal-side device, where the feedback signal includes the beam identification information and cross-polarization ratio information of the polarized transmission beam selected by the terminal-side device from the multiple pairs of polarized transmission beams; The cross-polarization ratio information of the selected polarization transmission beam determines whether the selected polarization transmission beam can be used for polarization multiplexing.

According to another aspect of the present disclosure, there is provided a communication method, including: receiving, from a network side device, multiple pairs of polarization transmission beams with different indication directions, each of the multiple pairs of polarization transmission beams being polarized transmission The beam includes a first polarization transmission beam and a second polarization transmission beam having the same indication direction, the first polarization transmission beam has a first polarization direction, and the second polarization transmission beam has the same direction as the first polarization transmission beam. A second polarization direction with a different polarization direction; select a polarization transmission beam from the multiple pairs of polarization transmission beams; send a feedback signal to the network side device, the feedback signal including the selected polarization transmission beam Beam identification information and cross-polarization ratio information; and when the network-side device determines that the selected polarized transmission beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarized transmission beam, Receiving a signal obtained by polarization multiplexing the selected polarization transmission beam from the network side device.

According to another aspect of the present disclosure, there is provided a network-side device including a processing circuit configured to receive uplink beam training signals from the terminal-side device using multiple pairs of polarized receiving beams with different indicating directions Each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam having the same indication direction, and the first polarized receiving beam has a first polarization. A polarization direction, the second polarization receiving beam has a second polarization direction different from the first polarization direction; a polarization receiving beam is selected from the polarization receiving beams in the plurality of pairs of polarization receiving beams, And use the polarization direction of the selected polarization receiving beam as the selected polarization direction; send multiple polarization transmission beams with different indication directions to the terminal-side device, and the multiple polarization transmission beams have the Selecting a polarization direction; receiving a feedback signal from the terminal-side device, the 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 determining The cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, and based on the cross polarization ratio of the selected polarization transmission beam, it is determined whether the selected polarization transmission beam can be used for polarization multiplexing. use.

According to another aspect of the present disclosure, there is provided a terminal-side device, including a processing circuit configured to send to the network-side device for selecting a pole from a plurality of pairs of polarized receiving beams with different indication directions. The uplink beam training signal of the polarized receiving beam, each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam having the same indication direction, and the first polarized receiving beam The polarized receiving beam has a first polarization direction, and the second polarized receiving beam has a second polarization direction that is different from the first polarization direction; receiving a plurality of different indication directions from the network side device Polarized transmission beams, the polarization directions of the multiple polarization transmission beams are the same as the polarization directions of the polarization reception beams selected by the network side device; and polarization transmission is selected from the multiple polarization transmission beams Beam; sending a feedback signal to the network-side device, the feedback signal including the beam identification information of the selected polarization transmission beam; and the network-side device based on the selected polarization indicated by the beam identification information If the cross polarization ratio of the transmission beam determines that the selected polarization transmission beam can be used for polarization multiplexing, polarization multiplexing is performed on the selected polarization transmission beam.

According to another aspect of the present disclosure, there is provided a communication method, including: receiving an uplink beam training signal from a terminal-side device using a plurality of pairs of polarized receiving beams with different indicating directions, wherein among the pairs of polarized receiving beams Each pair of polarization receiving beams includes a first polarization receiving beam and a second polarization receiving beam having the same indication direction, the first polarization receiving beam has a first polarization direction, and the second polarization receiving beam Having a second polarization direction different from the first polarization direction; selecting a polarization receiving beam from the polarization receiving beams in the plurality of pairs of polarization receiving beams, and setting the polarization of the selected polarization receiving beam The polarization direction is used as the selected polarization direction; multiple polarization transmission beams with different indication directions are sent to the terminal side device, and the multiple polarization transmission beams have the selected polarization direction; from the terminal side The device receives a feedback signal, the feedback signal including the beam identification information of the polarization transmission beam selected by the terminal-side device from the plurality of polarization transmission beams; and determining the selected one indicated by the beam identification information The cross-polarization ratio of the polarized transmission beam is polarized, and based on the cross-polarization ratio of the selected polarized transmission beam, it is determined whether the selected polarized transmission beam can be used for polarization multiplexing.

According to another aspect of the present disclosure, there is provided a communication method, including: sending an uplink beam training signal for selecting a polarized receiving beam from a plurality of pairs of polarized receiving beams having different indication directions to a network side device, the Each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam having the same indicating direction, the first polarized receiving beam having a first polarization direction, The second polarization receiving beam has a second polarization direction different from the first polarization direction; receiving multiple polarization transmission beams with different indication directions from the network side device, the multiple polarizations The polarization direction of the transmitting beam is the same as the polarization direction of the polarization receiving beam selected by the network side device; selecting a polarization transmitting beam from the plurality of polarization transmitting beams; sending a feedback signal to the network side device The feedback signal includes the beam identification information of the selected polarization transmission beam; and the network side device determines the selected polarization transmission beam based on the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information In the case where the polarization transmission beam can be used for polarization multiplexing, the polarization multiplexed signal is received from the network side device.

According to another aspect of the present disclosure, there is provided a non-transitory computer-readable storage medium having instructions stored thereon, which when executed by a processor causes the processor to execute the communication method of the present disclosure.

According to another aspect of the present disclosure, there is provided a communication device including components for performing each step of the communication method of the present disclosure.

The solution of the present disclosure can effectively utilize the polarization characteristics of the beam, and improve the spectrum efficiency of the system through polarization multiplexing.

Description of the drawings

A better understanding of the present disclosure can be obtained when the following detailed description of the embodiments is considered in conjunction with the accompanying drawings. The same or similar reference numerals are used in the various drawings to denote the same or similar components. The drawings, together with the following detailed description, are included in the specification and form a part of the specification, and are used to illustrate embodiments of the present disclosure and explain the principles and advantages of the present disclosure.

1A and 1B are schematic diagrams showing linear polarization and elliptical polarization of electromagnetic waves.

Fig. 2 is a schematic diagram showing a uniform planar array antenna with ±45° polarization.

FIG. 3 is a schematic diagram showing an example of the configuration of a communication system of some embodiments of the present disclosure.

Fig. 4 is a flowchart showing a downlink beam training and feedback process according to an embodiment of the present invention.

5A and 5B are schematic diagrams showing the transmission order of multiple pairs of polarized transmission beams according to an embodiment of the present disclosure.

Fig. 6 shows a communication method executed by a base station in a downlink beam training and feedback process according to an embodiment of the present disclosure.

Fig. 7 shows a communication method executed by a user equipment in a downlink beam training and feedback process according to an embodiment of the present disclosure.

FIG. 8 is a flowchart showing the uplink and downlink polarization beam training and feedback procedures according to an embodiment of the present disclosure.

FIG. 9 is a schematic diagram illustrating uplink polarization beam training according to an embodiment of the present disclosure.

Fig. 10 is a flowchart showing a polarization beam training and feedback process according to an embodiment of the present disclosure.

Fig. 11 shows a communication method executed by a base station in a downlink beam training and feedback process according to an embodiment of the present disclosure.

Fig. 12 shows a communication method executed by a user equipment in a beam training and feedback process according to an embodiment of the present disclosure.

FIG. 13 is a schematic diagram showing the configuration of a base station according to an embodiment of the present disclosure.

FIG. 14 is a schematic diagram showing the configuration of a user equipment according to an embodiment of the present disclosure.

15A, 15B, and 15C are schematic diagrams showing the use of polarized transmission beams for downlink transmission between a base station and two user equipments.

16A and 16B are schematic diagrams showing a conventional multi-user scheduling scheme, and FIGS. 16C and 16D are schematic diagrams showing multi-user scheduling based on beam polarization characteristics according to an embodiment of the present disclosure.

FIG. 17 is a graph showing simulation results of conventional multi-user scheduling and polarized beam-based multi-user scheduling according to an embodiment of the present disclosure.

FIG. 18 is a block diagram showing an example of a schematic configuration of a computing device to which the technology of the present disclosure can be applied.

FIG. 19 is a block diagram showing a first example of a schematic configuration of a gNB to which the technology of the present disclosure can be applied.

FIG. 20 is a block diagram showing a second example of a schematic configuration of a gNB to which the technology of the present disclosure can be applied.

FIG. 21 is a block diagram showing an example of a schematic configuration of a smart phone to which the technology of the present disclosure can be applied.

FIG. 22 is a block diagram showing an example of a schematic configuration of a car navigation device to which the technology of the present disclosure can be applied.

Detailed ways

Hereinafter, 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.

The description will be made in the following order:

1. System Overview

2. Processing flow

3. Application examples

<1. System Overview>

The present disclosure provides a network side device and a terminal side device that can perform wireless communication with each other. The network side device may be implemented as a base station or a control entity of the base station, or a key component thereof. For example, the network-side device may be implemented as a processing chip in a base station or a control entity, and the processing chip may implement wireless communication with the terminal-side device by controlling the base station or other components in the control entity. The terminal-side device may be implemented as a user equipment (UE) or a key component thereof. For example, the terminal-side device may be implemented as a processing chip in the user equipment, and the processing chip may realize wireless communication with the network-side device by controlling other components in the user equipment. For the sake of brevity, when describing the communication system and communication process of the present disclosure below, the base station and the user equipment will be used as examples for description.

First, the communication system of some embodiments of the present disclosure will be briefly described. FIG. 3 is a schematic diagram showing an example of the configuration of the communication system 300 of some embodiments of the present disclosure. As shown in FIG. 3, the communication system 300 includes a base station 310 and

user equipment

320A, 320B, and 320C. The base station 310 may perform wireless communication with each of the

user equipment

320A, 320B, and 320C. In this article, in the case where there is no need to distinguish the

user equipment

320A, 320B, and 320C, the reference numeral 320 is used to denote any one of the

user equipment

320A, 320B, and 320C. It should be noted that the number of user equipment 320 shown in FIG. 3 is an example, and the number of user equipment 320 is not limited to three, and may be any number.

Generally, the base station 310 will be configured with two antennas with different polarization directions, that is, an antenna with a first polarization direction and an antenna with a second polarization direction. The base station 310 can transmit a signal in the first polarization direction through an antenna in the first polarization direction, and can transmit a signal in the second polarization direction through an antenna in the second polarization direction. In some embodiments of the present disclosure, the first polarization direction and the second polarization direction may be +45 degree polarization direction and -45 degree polarization direction as shown in FIG. 2. In other embodiments of the present disclosure, the first polarization direction and the second polarization direction are the horizontal polarization direction and the vertical polarization direction. In other embodiments of the present disclosure, the first polarization direction and the second polarization direction are polarization directions perpendicular to each other.

Considering the strong directivity of antenna transmission and/or reception, the base station 310 and/or the user equipment 320 may apply beamforming to the transmission signal and/or the reception signal to form a transmission beam and/or a reception beam. By restricting the transmission beam and/or the reception beam to a specific indication direction among a plurality of indication directions, signal transmission and/or reception performance can be enhanced. The base station 310 and/or the user equipment 320 may perform training and feedback on multiple transmit beams and/or receive beams with different indication directions, and select the optimal transmit beam and/or receive beam from them.

In the case where the base station 310 is configured with an antenna in the first polarization direction and an antenna in the 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 having the same indication direction. The first polarization transmission beam is transmitted by the antenna of the first polarization direction and has the first polarization direction. The second polarization transmission beam is transmitted by the antenna of the second polarization direction and has the second polarization direction.

Taking into account the polarization characteristics of the antenna at the user equipment 320, even if the transmit power of the first polarization transmit beam and the second polarization transmit beam at the base station 310 are the same, the received power at the user equipment 320 may be different. The polarization characteristics of the antenna at the user equipment 320, specifically, in the case where the polarization direction of the antenna of the user equipment 320 is closer to the first polarization direction, the received power of the first polarization transmit beam at the user equipment May be higher than the received power of the second polarization transmit beam at the user equipment 320. When the polarization direction of the antenna of the user equipment 320 is closer to the second polarization direction, the received power of the first polarization transmission beam at the user equipment 320 will be lower than that of the second polarization transmission beam at the user equipment 320. Receive power.

The difference in received power at the user equipment between the first polarization transmission beam and the second polarization transmission beam may be characterized by a cross polarization ratio. The higher the cross-polarization ratio, the greater the difference between the received power of the first polarization transmission beam and the second polarization transmission beam at the user equipment 320. In this case, using a polarized transmission beam with higher received power to send a signal to the user equipment 320 can obtain better communication quality, while using a polarized transmission beam with lower received power to send a signal to the user equipment 320 will not Lead to poor communication quality. Therefore, the polarized transmission beam with lower received power may not be used to transmit signals to the user equipment 320, but may be used to transmit signals to other user equipment because it causes little interference to the former. Therefore, in this case, the first polarization transmission beam and the second polarization transmission beam can be used for polarization multiplexing.

For example, in the case where the received power of the first polarization transmission beam at the user equipment is large and the reception power of the second polarization transmission beam at the user equipment 320 is small, the first polarization transmission beam may be used to transmit to the user equipment 320 Signal, and use the second polarization transmit beam to transmit signals to other user equipment.

<2. Processing flow>

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

In step S402, the base station 310 transmits a downlink beam training signal through multiple pairs of polarized transmission beams with different indication directions. That is, the base station 310 sends multiple pairs of polarization transmission beams with different indication directions to the user equipment 320, and the user equipment 320 receives multiple pairs of polarization transmission beams with different indication directions from the base station 310. Each pair of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam having the same indication direction. The first polarization transmission beam has a first polarization direction. The second polarization transmission beam has a second polarization direction different from the first polarization direction.

When performing beam training, the base station 310 may distinguish the first polarization transmission beam and the second polarization transmission beam through different time-frequency resources. Based on the currently used time-frequency resources, the user equipment 320 can identify the polarized transmission beam currently undergoing training. In the case where the base station 310 trains the M-pair polarization transmission beam, a total of 2M time-frequency resources are required.

In some embodiments, the downlink beam training signals sent through multiple pairs of polarized sending beams may be reference signals carried on different time-frequency resources. For example, the reference signal may be a channel state information reference signal (CSI-RS). The base station 310 may configure a pair of CSI-RS ports corresponding to different CSI-RS resources for the first polarization transmission beam and the second polarization transmission beam in each pair of polarization transmission beams, and transmit via the pair of CSI-RS ports. The first polarization transmission beam and the second polarization transmission beam.

In other embodiments, the downlink beam training signals sent by multiple pairs of polarized transmission beams may be different synchronization signal blocks (SSB).

The user equipment 320 may determine the reception power of the first polarization transmission beam and the reception power of the second polarization transmission beam based on the received signal strength. For example, the user equipment 320 may determine the reception power of the first polarization transmission beam and the reception power of the second polarization transmission beam based on the received CSI-RS or SSB signal strength.

In addition, the multiple pairs of polarized transmission beams transmitted from the base station 310 may be transmitted in different orders. 5A and 5B are schematic diagrams showing the transmission order of multiple pairs of polarized transmission beams according to an embodiment of the present disclosure. In FIGS. 5A and 5B, 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.

In FIG. 5A, the base station 310 sequentially transmits each pair of polarized transmission beams in a plurality of pairs of polarized transmission beams. That is, the base station 310 first transmits the first polarization transmission beam and the second polarization transmission beam in a pair of polarization transmission beams, and then transmits the first polarization transmission beam and the second polarization transmission beam in the next pair of polarization transmission beams. Polarized transmit beam.

In this case, according to the number of radio frequency circuits configured by the base station 310 for the antenna, the first polarized transmission beam and the second polarized transmission beam of the same pair of polarized transmission beams may be transmitted simultaneously or successively. For example, in a case where a pair of cross-polarized antennas are connected to a single radio frequency circuit, the first polarization transmission beam and the second polarization transmission beam of the same pair of polarization transmission beams are successively transmitted. Or, for example, in a case where a pair of cross-polarized antennas are connected to a pair of radio frequency circuits, the first polarization transmission beam and the second polarization transmission beam of the same pair of polarization transmission beams are simultaneously transmitted.

In this case, since the transmission time of the first polarization transmission beam and the second polarization transmission beam in the same pair of polarization transmission beams are the same or similar, the user equipment 320 can determine the pair of polarization transmission beams in time. Cross polarization ratio. In addition, since the transmission time is the same or similar, the channel conditions experienced by the first polarization transmission beam and the second polarization transmission beam in the same pair of polarization transmission beams are also the same or similar, so the user equipment 320 can more accurately determine the channel conditions. The cross-polarization ratio of the polarized transmit beam.

In FIG. 5B, the base station 310 sequentially transmits the first polarization transmission beam of the multiple pairs of polarization transmission beams, and then sequentially transmits the second polarization transmission beam of the multiple pairs of polarization transmission beams. That is, the base station 310 first transmits all the first polarization transmission beams, and then transmits all the second polarization transmission beams.

Returning to FIG. 4, in step S404, the user equipment 320 selects a polarized transmission beam from a plurality of pairs of polarized transmission beams. For example, the user equipment 320 may select the polarized transmission beam with the highest received power among the received pairs of polarized transmission beams.

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 the beam identification information of the polarized transmission beam selected by the user equipment 320 and includes the cross-polarization ratio information of the selected polarized transmission beam.

The beam identification information of the polarized transmission beam is used to identify the polarized transmission beam selected by the user equipment 320. In the case where the base station 310 uses CSI-RS for downlink beam training, the user equipment 320 may feed back a CSI-RS resource indicator (CRI) as beam identification information. In the case where the base station 310 uses the SSB to perform downlink beam training, the user equipment 320 may feed back the SSB index as the beam identification information.

In some embodiments, the cross-polarization ratio information includes the cross-polarization ratio of the polarized transmission beam selected by the user equipment 320. In this article, the cross polarization ratio of a certain polarization transmission beam in a pair of polarization transmission beams refers to the cross polarization ratio of the pair of polarization transmission beams. The cross-polarization ratio of a pair of polarized transmit beams can be determined according to the following formula 1:

In formula 1,

Is the downlink cross-polarization ratio of a pair of polarized transmit beams numbered m,

with

Respectively are the downlink channels between the antenna array in the first polarization direction and the antenna array in the second polarization direction of the base station 310 and the user equipment 320, w _DL is the downlink receiving beam used by the user equipment 320,

with

They are respectively the first polarization transmission beam and the second polarization transmission beam in a pair of polarization transmission beams numbered m. It can be seen that the cross polarization ratio

In fact, it is the ratio of the received power of the first polarization transmission beam to the second polarization transmission beam, or the difference between the RSRP of the first polarization transmission beam and the RSRP of the second polarization transmission beam. The larger the cross-polarization ratio of a pair of polarized transmission beams is, the smaller the interference between different polarization directions of the pair of polarized transmission beams is, and therefore the better the performance during polarization multiplexing.

In some embodiments, the user equipment 320 may not directly feed back the cross-polarization ratio, but will indicate the received power of the selected polarization transmission beam and the received power of the polarization transmission beam paired with the selected polarization transmission. Information (for example, RSRP) is fed back to the base station 310 as cross polarization ratio information. The polarized transmission beam paired with the selected polarized transmission beam has the indicated direction of the polarized transmission beam indicated by the beam identification information fed back by the user equipment 320, and has the first polarization direction and the second polarization direction. The polarization direction of the polarization transmission beam indicated by the beam identification information fed back by the user equipment 320 is different. The base station 310 may calculate the cross polarization ratio of the selected polarization transmission beam based on the reception power of the selected polarization transmission beam and the reception power of the polarization transmission beam paired with the selected polarization transmission.

In step S408, the base station 310 determines whether the selected polarization transmission beam can be used for polarization multiplexing based on the cross polarization ratio information of the selected polarization transmission beam. For example, the base station 310 may compare the cross-polarization ratio of the selected polarized transmission beam with the polarization threshold, and determine the selected polarized transmission beam if the cross-polarization ratio of the selected polarized transmission beam is greater than or equal to the polarization threshold. The polarized transmit beam can be used for polarization multiplexing. In practice, the cross-polarization ratio of the LoS channel obeys a Gaussian distribution with a mean value of 9.7dB and a standard deviation of 6.3dB. Therefore, in order to ensure small inter-polarization interference, the polarization threshold can be set to 6dB, that is, the power of the target polarization signal is 4 times the power of the interference polarization signal.

In step S410, in a case where the base station 310 determines that the selected polarized transmission beam can be used for polarization multiplexing, polarization multiplexing is performed on the selected polarized transmission beam. That is, the base station 310 transmits the polarization multiplexed signal to the user equipment 320, and the user equipment 320 receives the polarization multiplexed signal from the base station 310.

Fig. 6 shows a communication method 600 executed by a base station in a downlink beam training and feedback process according to an embodiment of the present disclosure. As shown in FIG. 6, in step S602, the base station sends multiple pairs of polarized transmission beams with different indication directions to the user equipment. Each pair of polarization transmission beams in the plurality of pairs of polarization transmission beams includes a first polarization transmission beam and a second polarization transmission beam having the same indication direction. The first polarization transmission beam has a first polarization direction. The second polarization 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. The feedback signal includes beam identification information and cross-polarization ratio information of the polarization transmission beam selected by the user equipment from the multiple pairs of polarization 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, in the case that the selected polarization transmission beam can be used for polarization multiplexing, the base station performs polarization multiplexing on the selected polarization transmission beam.

The details of steps S602, S604, S606, and S608 have been described in detail above with reference to FIG. 4. For the sake of brevity, the description will not be repeated here.

Fig. 7 shows a communication method 770 executed by a user equipment in a downlink beam training and feedback process according to an embodiment of the present disclosure. As shown in Fig. 7, in step S772, the user equipment receives multiple pairs of polarized transmission beams with different indication directions from the base station. Each pair of polarization transmission beams in the plurality of pairs of polarization transmission beams includes a first polarization transmission beam and a second polarization transmission beam having the same indication direction. The first polarization transmission beam has a first polarization direction. The second polarization transmission beam has a second polarization direction different from the first polarization direction. In step S774, the user equipment selects a polarized transmission beam from a plurality of pairs of polarized transmission 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 transmission beam. In step S778, in the case where the base station determines that the selected polarized transmission beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarized transmission beam, a response to the selected polarized transmission beam is received from the base station. Polarization multiplexed signal.

The details of steps S772, S774, S776, and S778 have been described in detail above with reference to FIG. 4. For the sake of brevity, the description will not be repeated here.

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

Generally speaking, the downlink transmission between the base station and the user equipment has the same polarization characteristics as the uplink transmission, that is, the downlink transmission and the uplink transmission have polarization reciprocity. That is, if the uplink signal of a certain polarity sent by the user equipment has a high received power at the base station, the downlink signal of that polarity sent by the base station usually has a higher received power at the user equipment. Polarized reciprocity does not require channel reciprocity between the uplink channel and the downlink channel. Compared with channel reciprocity, polarization reciprocity is a relatively weak reciprocity requirement for uplink and downlink channel characteristics. Therefore, both TDD and FDD systems have polarization reciprocity.

The following describes a scheme for performing uplink and downlink polarization beam training based on polarization reciprocity to reduce the overhead of time-frequency resources. FIG. 8 is a flowchart showing the uplink and downlink polarization beam training and feedback process 880 according to an embodiment of the present disclosure.

In step S882, the user equipment 320 sends an uplink beam training signal to perform uplink polarization beam training. The uplink beam training signal may be a reference signal, such as a sounding reference signal (SRS). The base station 310 receives the uplink beam training signal from the user equipment 320 through 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 having 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.

The base station 310 may receive the uplink beam training signal through multiple pairs of polarized receiving beams in different orders. Similar to the downlink beam training and feedback process 400, the base station 310 can first receive the uplink beam training signal through the first polarization receiving beam of the multiple pairs of polarization receiving beams, and then receiving the second polarization of the multiple pairs of polarization receiving beams. The receiving beam receives the uplink beam training signal.

Alternatively, the base station 310 may sequentially receive the uplink beam training signal through each pair of polarized receiving beams in a plurality of pairs of polarized receiving beams. FIG. 9 is a schematic diagram illustrating uplink polarization receiving beam training according to an embodiment of the present disclosure. In FIG. 9, 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. As shown in FIG. 9, the base station 310 sequentially receives the uplink beam training signal from the user equipment 320 through each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams. In other words, the base station 310 first receives the uplink beam training signal through the first polarization reception beam and the second polarization reception beam in a pair of polarization reception beams, and then passes the first polarization reception beam in the next pair of polarization reception beams. The receiving beam and the second polarization receiving beam receive the uplink beam training signal.

The first polarized receiving beam and the second polarized receiving beam of the same pair of polarized receiving beams may be trained simultaneously or sequentially. Generally, at the base station 310, antennas with different polarization directions are connected to different radio frequency circuits, so the base station 310 can train beams in two polarization directions at the same time. That is, the base station 310 may simultaneously receive the uplink beam training signal through the first polarized receiving beam and the second polarized receiving beam of a pair of polarized receiving beams.

Returning to FIG. 8, in step S884, the base station 310 selects a polarized receiving beam from a plurality of pairs of polarized receiving beams. For example, the base station 310 may select the polarized receiving beam with the highest received power among the multiple pairs of polarized receiving beams used.

The base station 310 may determine the polarization direction of the selected polarization receiving beam, and use the polarization direction as the selected polarization direction of the polarization transmission beam to be sent to the user equipment 320 in the subsequent downlink polarization beam training and feedback process. Orientation. The selected polarization direction is one of the first polarization direction and the second polarization direction. Since the uplink transmission and the downlink transmission have polarization reciprocity, the polarization direction of the polarized receiving beam with the highest received power at the base station 310 will be closer to the polarization direction of the antenna of the user equipment 320. Therefore, if the signal in the polarization direction is sent to the user equipment 320, better communication quality can be obtained.

In step S886, the base station 310 transmits a downlink beam training signal to the user equipment 320 through multiple polarization transmission beams with different indication directions. That is, the base station 310 sends multiple polarization transmission beams with different indication directions to the user equipment 320, and the user equipment 320 receives multiple polarization transmission beams with different indication directions from the base station 310. The multiple polarized transmit beams have a selected polarization direction, that is, the polarization direction of the polarized receive beam selected by the base station 310, and is one of the first polarization direction and the second polarization direction.

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

In step S890, the base station 310 receives the feedback signal from the user equipment 320. The feedback signal includes the beam identification information of the polarized transmission beam selected by the user equipment 320. The beam identification information of the polarized transmission beam is used to identify the polarized transmission beam selected by the user equipment 320. In the case where the base station 310 uses CSI-RS for downlink beam training, the user equipment 320 may feed back a CSI-RS resource indicator (CRI) as beam identification information. In the case where the base station 310 uses the SSB to perform downlink beam training, the user equipment 320 may feed back the SSB index as the beam identification information.

In step S892, the base station 310 determines the cross-polarization ratio of the selected polarized transmission beam indicated by the beam identification information fed back by the user equipment 320. In this article, the cross-polarization ratio of a certain polarized receiving beam in a pair of polarized receiving beams refers to the cross-polarization ratio of the pair of polarized receiving beams. Here, there are at least two ways to determine the cross-polarization ratio. The first method for determining the cross-polarization ratio is based on polarization reciprocity, and the cross-polarization ratio of the polarized receiving beam selected by the base station 310 is used as the cross-polarization ratio of the polarized transmitting beam selected by the user equipment 320. The second method for determining the cross-polarization ratio is to transmit the polarization transmission beam of the polarization direction not trained in step S886 from the base station 310, and obtain the accurate cross-polarization of the polarization transmission beam selected by the user equipment 320 based on user feedback. Ratio. The second method for determining the cross-polarization ratio will be described later with reference to FIG. 10. The first method of determining the cross-polarization ratio is discussed here.

In the first method for determining the cross-polarization ratio, the base station 310 may determine the cross-polarization ratio of the selected polarized receive beam according to the following formula 2:

In formula 2,

Is the uplink cross-polarization ratio of a pair of polarized receive beams numbered m,

with

Are respectively the upper channel between the antenna array in the first polarization direction and the antenna array in the second polarization direction of the base station 310 and the user equipment 320, w _UL is the uplink transmission beam used by the user equipment 320,

with

They are the first polarized receiving beam and the second polarized receiving beam in a pair of polarized receiving beams numbered m. It can be seen that the cross polarization ratio

In fact, it is the ratio of the received power of the first polarization receiving beam to the second polarization receiving beam, or the difference between the RSRP of the first polarization receiving beam and the RSRP of the second polarization receiving beam.

In step S894, the base station 310 determines whether the selected polarization transmission beam can be used for polarization multiplexing based on the cross polarization ratio information of the selected polarization transmission beam. For example, the base station 310 may compare the cross-polarization ratio of the selected polarized transmission beam with the polarization threshold, and determine the selected polarized transmission beam if the cross-polarization ratio of the selected polarized transmission beam is greater than or equal to the polarization threshold. The polarized transmit beam can be used for polarization multiplexing. The cross-polarization ratio of the LoS channel obeys a Gaussian distribution with an average of 9.7dB and a standard deviation of 6.3dB. Therefore, in order to ensure small inter-polarization interference, the polarization threshold can be set to 6dB, that is, the power of the target polarization signal is 4 times the power of the interference polarization signal.

In step S896, in the case where the base station 310 determines that the selected polarized transmission beam can be used for polarization multiplexing, polarization multiplexing is performed on the selected polarized transmission beam. That is, the base station 310 sends the 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 mode has been described above, and the description will not be repeated here.

The polarization beam training and feedback process 880 utilizes the polarization reciprocity of uplink transmission and downlink transmission. In step S886, only the polarization transmission beam in one polarization direction is trained, but the polarization transmission beam in the other polarization direction is not trained. Therefore, the number of polarized transmission beams trained in step S886 is reduced, thereby reducing the overhead of time-frequency resources. However, since it uses the cross-polarization ratio of the polarized receiving beam as the cross-polarization ratio of the polarized transmitting beam, there may be some errors in the estimation of the cross-polarization ratio, which may cause cross-polarization interference.

In order to obtain a more accurate cross-polarization ratio, the base station 310 may adopt the second method for determining the cross-polarization ratio. That is to say, the base station 310 sends a polarization transmission beam in another polarization direction that is 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.

The following describes a scheme for obtaining a more accurate cross-polarization ratio by training a polarized transmission beam in another polarization direction. FIG. 10 is a flowchart showing a polarization beam training and feedback process 1000 according to an embodiment of the present disclosure.

In step S1002, the user equipment 320 sends an uplink beam training signal to perform uplink polarization beam training, and the base station 310 receives the uplink beam training signal from the user equipment 320 through multiple pairs of polarization receiving beams with different indication directions. In step S1004, the base station 310 selects a polarized receiving beam from a plurality of pairs of polarized receiving beams, and determines the polarization direction of the selected polarized receiving beam. In step S1006, the base station 310 sends a downlink beam training signal to the user equipment 320 through multiple polarization transmission beams with different indication directions. The polarization direction of the multiple polarization transmission beams is the same as the polarization of the selected polarization reception beam. The same direction. In step S1008, the user equipment 320 selects a polarized transmission beam from a plurality of polarized transmission beams. In step S810, the base station 310 receives a feedback signal from the user equipment 320. The feedback signal includes the beam identification information of the polarized transmission beam selected by the user equipment 320. The processing of steps S1002, S1004, S1006, S1008, and S1010 in FIG. 10 is the same as the processing of steps S882, S884, S886, S888, and S890 in FIG. 8, so the details will not be described here.

In step S1012, the base station 310 transmits a downlink beam training signal to the user equipment 320 through the polarization transmission beam paired with the selected polarization transmission beam. The polarized transmission beam paired with the selected polarized transmission beam has the indicated direction of the polarized transmission beam indicated by the beam identification information fed back by the user equipment 320, and has the first polarization direction and the second polarization direction. The polarization direction of the polarization transmission beam indicated by the beam identification information fed back by the user equipment 320 is different.

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 the cross-polarization ratio information of the selected polarized transmission beam.

In some embodiments, the cross-polarization ratio information includes the cross-polarization ratio of the selected polarization transmission beam determined by the user equipment 320 according to Formula 1. In some embodiments, the user equipment 320 may not directly feed back the cross-polarization ratio, but will indicate the received power of the selected polarization transmission beam and the received power of the polarization transmission beam paired with the selected polarization transmission. Information (for example, RSRP) is fed back to the base station 310 as cross polarization ratio information. The base station 310 may calculate the cross polarization ratio of the selected polarization transmission beam based on the reception power of the selected polarization transmission beam and the reception power of the polarization transmission beam paired with the selected polarization transmission.

In step S1016, the base station 310 determines whether the selected polarization transmission beam can be used for polarization multiplexing based on the cross polarization ratio information of the selected polarization transmission beam. For example, the base station 310 may compare the cross-polarization ratio of the selected polarized transmission beam with the polarization threshold, and determine the selected polarized transmission beam if the cross-polarization ratio of the selected polarized transmission beam is greater than or equal to the polarization threshold. The polarized transmit beam can be used for polarization multiplexing.

In step S1018, in the case where the base station 310 determines that the selected polarized transmission beam can be used for polarization multiplexing, polarization multiplexing is performed on the selected polarized transmission beam. That is, the base station 310 sends the polarization multiplexed signal to the user equipment 320, and the user equipment 320 receives the polarization multiplexed signal from the base station 310.

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 transmission beam, so the base station 310 can obtain the accurate cross polarization ratio of the selected polarization transmission beam. In order to avoid cross-polarization interference.

FIG. 11 shows a communication method 1100 executed by a base station in a downlink beam training and feedback process according to an embodiment of the present disclosure.

As shown in FIG. 11, in step S1102, the base station uses multiple pairs of polarized receiving beams with different indication directions to receive the uplink beam training signal from the user equipment. Each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam having 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.

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

In step S1106, the base station sends multiple polarization transmission beams with different indication directions to the user equipment. The multiple polarized transmit beams have selected polarization directions.

In step S1108, the base station receives a feedback signal from the user equipment. The feedback signal includes beam identification information of a polarized transmission beam selected by the user equipment from a plurality of polarized transmission beams.

In step S1110, the base station determines the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, and determines whether the selected polarization transmission beam can be used based on the cross polarization ratio of the selected polarization transmission beam. For polarization multiplexing. In step S1112, in the case that the selected polarization transmission beam can be used for polarization multiplexing, the base station performs polarization multiplexing on the selected polarization transmission beam.

The details of the operations of steps S1102, S1104, S1106, S1108, S1110, and S1112 have been described in detail above with reference to FIGS. 8 and 10. For the sake of brevity, the description will not be repeated here.

FIG. 12 shows a communication method 1200 executed by a user equipment in a beam training and feedback process according to an embodiment of the present disclosure.

As shown in FIG. 12, in step S1202, the user equipment sends to the base station an uplink beam training signal for selecting a polarized receiving beam from a plurality of pairs of polarized receiving beams with different indication directions. Each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams includes a first polarized receiving beam and a second polarized receiving beam having 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.

In step S1204, the user equipment receives multiple polarization transmission beams with different indication directions from the base station. The polarization directions of the multiple polarized transmit beams are the same as the polarization directions of the polarized receive beams selected by the base station.

In step S1206, the user equipment selects a polarized transmission beam from a plurality of polarized transmission beams.

In step S1208, the user equipment sends a feedback signal to the base station. The feedback signal includes the beam identification information of the selected polarized transmission beam.

In step S1210, in the case where the base station determines that the selected polarization transmission beam can be used for polarization multiplexing based on the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, the selected polarization transmission beam can be used for polarization multiplexing. Transmit beams for polarization multiplexing.

The details of the operations of steps S1202, S1204, S1206, S1208, and S1210 have been described in detail above with reference to FIGS. 8 and 10. For the sake of brevity, the description will not be repeated here.

FIG. 13 is a schematic diagram showing a configuration 1300 of a base station according to an embodiment of the present disclosure. As shown in FIG. 13, the base station includes a beam sending unit 1305, a beam measuring unit 1310, a beam selecting unit 1315, and a polarization multiplexing unit 1320.

The beam sending unit 1305 is used to send a polarized transmission beam. The beam measuring unit 1310 is used to measure the received power of the polarized receiving beam. The beam selection unit 1315 is used to select a polarized receiving beam. The polarization multiplexing unit 1320 is used to determine the cross polarization ratio of the polarization transmission/reception beam, determine whether polarization multiplexing is possible based on the cross polarization ratio, and transmit polarization multiplexed signals. The details of the operations of the beam sending unit 1305, the beam measuring unit 1310, the beam selection unit 1315, and the polarization multiplexing unit 1320 have been described in the previous beam training and feedback procedures, and will not be repeated here.

FIG. 14 is a schematic diagram showing a configuration 1400 of a user equipment according to an embodiment of the present disclosure. As shown in FIG. 14, the user equipment includes a sending unit 1405, a beam measuring unit 1410, a beam selecting unit 1415, and a receiving unit 1420.

The sending unit 1405 is used to send an uplink beam training signal. The beam measuring unit 1410 is used to measure the received power of the polarized transmission beam and determine the cross-polarization ratio of the polarized transmission beam. The beam selection unit 1415 is used to select a polarized transmission beam. The receiving unit 1420 is used for receiving polarization multiplexed signals. The details of the operations of the transmitting unit 1405, the beam measuring unit 1410, the beam selecting unit 1415, and the receiving unit 1420 have been described in the previous beam training and feedback procedures, and will not be repeated here.

The above describes the embodiment in which the polarization beam training and feedback are used to determine whether the polarization transmission beam of the base station can be used for polarization multiplexing. Next, a specific polarization multiplexing manner according to an embodiment of the present disclosure will be described.

In this article, polarization multiplexing includes inter-user polarization multiplexing and intra-user polarization multiplexing. Inter-user polarization multiplexing refers to using two polarization transmission beams with different polarization directions to respectively send signals to two user equipments, and the indication directions of the two polarization transmission beams with different polarization directions are the same or adjacent. The two users can be multiplexed in the two polarization transmission beams with different polarization directions through user scheduling. Intra-user polarization multiplexing refers to using two polarized transmit beams with different polarization directions to send two signals to the same user equipment respectively, and the indicated directions of the two polarized transmit beams with different polarization directions are the same. In the case of intra-user polarization multiplexing, since the user equipment needs to receive signals in two different polarization directions well, the user equipment needs to be equipped with dual-polarized antennas.

In the case where the user equipment is configured with a single-polarization antenna, the base station only uses a polarization transmission beam of a single polarization direction when sending a downlink signal to the user equipment. Therefore, the base station can distinguish the downlink signals sent to different user equipments by polarizing the direction of polarization of the transmitting beam or indicating the direction, as shown in Figs. 15A, 15B, and 15C.

15A, 15B, and 15C are schematic diagrams showing the use of polarized transmission beams for downlink transmission between a base station and two user equipments. In FIG. 15A, the polarization directions of the polarization transmission beams used by the base station 210 to transmit downlink signals to the

user equipment

320A and 320B are the same but the indication directions are different. In FIG. 15B, the polarization direction and the indication direction of the polarization transmission beam used by the base station 210 to transmit downlink signals to the

user equipment

320A and 320B are different. In FIG. 15C, the polarization directions of the polarization transmission beams used by the base station 210 to transmit downlink signals to the

user equipment

320A and 320B are different but the indication directions are the same.

The following formula 3 can be used to establish the downlink multi-user MIMO transmission model in FIGS. 15A, 15B, and 15C using polarized transmission beams. use

Represents the downlink channel matrix between the k-th user equipment and the base station, where p _k =1, 2 represents the polarization direction, and M and N are the number of antennas of the base station and the user equipment, respectively. The downlink multi-user MIMO transmission model using polarized beams is:

Is the receive beam vector of the user equipment 320,

Is the transmit beam vector with the polarization direction p _k _{, sk} is the transmit symbol,

Is the AWGN vector. second section

Represents interference between users.

In Figure 15A,

p _k = p _l , so the inter-user interference between

user equipment

320A and 320B

Inter-beam interference within polarization. In Figure 15B,

p _k ≠p _l , so the inter-user interference between

user equipment

320A and 320B

Inter-polarization inter-beam interference. In Figure 15C,

p _k ≠p _l , so the inter-user interference between

user equipment

320A and 320B

Inter-polarization interference within the beam.

In the traditional beam-based multi-user MIMO system, there is only intra-polarization inter-beam interference as shown in FIG. 15A. In the inter-user polarization multiplexing according to the embodiment of the present disclosure, there are inter-polarization inter-beam interference as shown in FIG. 15B and intra-beam inter-polarization interference as shown in FIG. 15C.

Generally, when the cross polarization of a pair of polarized transmission beams is relatively large, the inter-polarization inter-beam interference and intra-beam inter-polarization interference generated by the corresponding beams are small. According to some embodiments of the present disclosure, multi-user scheduling may be performed based on the polarization characteristics of the beam. For example, when UE1 and UE2 select the polarization transmission beams with different polarization directions but adjacent or same indication directions, if the cross-polarization ratios fed back by UE1 and UE2 are both lower than the polarization threshold at the base station, Then the base station can pair UE 1 with UE 2 and allow them to be scheduled in the same time-frequency resource.

16A and 16B are schematic diagrams showing a conventional multi-user scheduling scheme. In FIG. 16A, 4 UEs

select transmission 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, and UE 2 and UE 4 are scheduled in time-frequency resource 2. In FIG. 16B, UE 1 and UE 2 select transmission beam 1, and UE 2 and UE 4 select transmission beam 3. To avoid strong interference in the same beam, UE 1 and UE 3 are scheduled in time-frequency resource 1, and UE 2 and UE 4 are scheduled in time-frequency resource 2.

16C and 16D are schematic diagrams 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 transmission beams exceeds the polarization threshold, two UEs can be multiplexed in the same time-frequency resource with different polarization directions but adjacent indication directions (as shown in Figure 16C) ) Or within the polarized transmit beam with the same indication direction (as shown in Figure 16D). Since the cross polarization is relatively high, the inter-polarization inter-beam interference and intra-beam inter-polarization interference caused by polarization multiplexing are small, which can reduce the time-frequency resource overhead and significantly improve the spectrum efficiency of the system.

The above describes the scheme of performing polarization multiplexing between users through multi-user scheduling when the user equipment is configured with a single-polarized antenna. The following will describe sending two data streams to a single user through intra-user polarization multiplexing when the user equipment is configured with dual-polarized antennas.

In the case that the user equipment is configured with an orthogonal polarized antenna array, the signal received by the antenna array with the user side polarization j (j=1, 2) can be expressed as:

y _j = w _j H _jj f _j s _j + w _j H _j′j f _j′ s _j′ + w _j n _j (Equation 4).

Is the receive beam vector of the antenna array with polarization j,

Is the channel matrix between the base station antenna array with polarization j′ and the user antenna array with polarization j,

Is the transmit beam vector of the base station antenna array with polarization j. The second term w _j H _j′j f _j′ s _j′ represents the interference of the transmitted signal of polarization j′ to the received signal of polarization j.

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

According to some embodiments of the present disclosure, the average cross-polarization ratio, that is, (XPR ₁ +XPR ₂ )/2, can be measured on the user side, and fed back to the base station. Alternatively, the base station may calculate the average cross-polarization ratio based on the cross-polarization ratio information fed back by the user equipment. The base station can determine whether the user can perform intra-user polarization multiplexing transmission based on the average cross polarization ratio. 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.

In addition, according to some embodiments of the present disclosure, the cross-polarization ratio can be dynamically monitored and updated. Generally, due to changes in the wireless communication environment or user rotation, the cross-polarization ratio changes dynamically. Therefore, periodic or aperiodic 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.

In some embodiments of the present disclosure, the base station periodically transmits the selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam according to the cross-polarization ratio monitoring period to monitor the selected polarization. Transmit the cross-polarization ratio of the beam. For example, the base station periodically transmits the downlink beam training signal dedicated to the cross-polarization ratio monitoring through the downlink polarization transmission beam in use and the polarization transmission beam paired therewith according to the cross-polarization ratio monitoring period. The user equipment measures the selected polarization transmission beam and the polarization transmission beam paired with it, 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).

In some embodiments of the present disclosure, when the user equipment detects an event that triggers the change of the cross-polarization ratio, it sends a cross-polarization ratio monitoring request to the base station through uplink control information (UCI). After obtaining the cross polarization ratio monitoring request, the base station transmits the selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam to monitor the cross polarization ratio of the selected polarization transmission beam.

FIG. 17 is a graph showing simulation results of conventional multi-user scheduling and polarized beam-based multi-user scheduling according to an embodiment of the present disclosure. In FIG. 17, the traditional solution corresponds to the multi-user scheduling solution of FIG. 10B, and the solution of the present invention corresponds to the polarization beam-based multi-user scheduling solution of FIG. 16D. As shown in Figure 17, the solution of the present invention can significantly improve the spectrum efficiency of the system.

<3. Application example>

The technology of the present disclosure can be applied to various products. For example, both the base station and the user equipment can be implemented as various types of computing devices.

In addition, the base station can be implemented as any type of evolved Node B (eNB), gNB, or TRP (Transmit Receive Point), such as macro eNB/gNB and small eNB/gNB. The small eNB/gNB may be an eNB/gNB covering a cell smaller than a macro cell, such as a pico eNB/gNB, a micro eNB/gNB, and a home (femto) eNB/gNB. Instead, the base station may be implemented as any other type of base station, such as NodeB and base transceiver station (BTS). The base station may include: a main body (also referred to as a base station device) configured to control wireless communication; and one or more remote radio heads (RRH) arranged in a different place from the main body. In addition, various types of terminals to be described below can all operate as base stations by temporarily or semi-persistently performing base station functions.

In addition, the user equipment can be implemented as a mobile terminal (such as a smart phone, a tablet personal computer (PC), a notebook PC, a portable game terminal, a portable/dongle type mobile router, and a digital camera) or a vehicle-mounted terminal (such as a car navigation device) ). The user equipment may also be implemented as a terminal (also referred to as a machine type communication (MTC) terminal) that performs machine-to-machine (M2M) communication. In addition, the user equipment may be a wireless communication module (such as an integrated circuit module including a single chip) installed on each of the aforementioned terminals.

[3-1. Application examples of computing equipment]

FIG. 18 is a block diagram showing an example of a schematic configuration of a computing device 700 to which the technology of the present 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.

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 a storage medium, such as a semiconductor memory and a hard disk.

The network interface 704 is a wired communication interface for connecting the server 700 to the wired communication network 705. The wired communication network 705 may be a core network such as an evolved packet core network (EPC) or a packet data network (PDN) such as the Internet.

The bus 706 connects the processor 701, the memory 702, the storage device 703, and the network interface 704 to each other. The bus 706 may include two or more buses (such as a high-speed bus and a low-speed bus) each having a different speed.

[3-2. Application examples of base stations]

(First application example)

FIG. 19 is a block diagram showing a first example of a schematic configuration of a gNB to which the technology of the present 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 may be connected to each other via an RF cable.

Each of the antennas 810 includes a single or multiple antenna elements (such as multiple antenna elements included in a multiple input multiple output (MIMO) antenna), and is used for the base station device 820 to transmit and receive wireless signals. As shown in FIG. 19, the gNB 800 may include multiple antennas 810. For example, multiple antennas 810 may be compatible with multiple frequency bands used by gNB 800. Although FIG. 19 shows an example in which the gNB 800 includes multiple antennas 810, the gNB 800 may also include a single antenna 810.

The base station device 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.

The controller 821 may be, for example, a CPU or a DSP, and operates various functions of a higher layer of the base station device 820. For example, the controller 821 generates a data packet based on the data in the signal processed by the wireless communication interface 825, and transmits the generated packet via the network interface 823. The controller 821 may bundle data from a plurality of baseband processors to generate a bundled packet, and transfer the generated bundled packet. The controller 821 may have a logic function to perform control such as radio resource control, radio bearer control, mobility management, admission control, and scheduling. This control can be performed in conjunction with nearby gNB 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 a terminal list, transmission power data, and scheduling data).

The network interface 823 is a communication interface for connecting the base station device 820 to the core network 824. The controller 821 may communicate with the core network node or another gNB via the network interface 823. In this case, the gNB 800 and the core network node or other gNB can be connected to each other through logical interfaces (such as the S1 interface and the X2 interface). The network interface 823 may also be a wired communication interface or a wireless communication interface for a wireless backhaul line. If the network interface 823 is a wireless communication interface, the network interface 823 can use a higher frequency band for wireless communication than the frequency band used by the wireless communication interface 825.

The wireless communication interface 825 supports any cellular communication scheme, such as Long Term Evolution (LTE) and LTE-Advanced, and provides a wireless connection to a terminal located in a cell of the gNB 800 via an antenna 810. The wireless communication interface 825 may generally include, for example, a baseband (BB) processor 826 and an RF circuit 827. The BB processor 826 can perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and perform layers (such as L1, medium access control (MAC), radio link control (RLC), and packet data convergence protocol ( PDCP)) various types of signal processing. Instead of the controller 821, the BB processor 826 may have a part or all of the above-mentioned logical functions. The BB processor 826 may be a memory storing a communication control program, or a module including a processor and related circuits configured to execute the program. The update program can change the function of the BB processor 826. The module may be a card or a blade inserted into the slot of the base station device 820. Alternatively, the module can also 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 transmit and receive wireless signals via the antenna 810.

As shown in FIG. 19, the wireless communication interface 825 may include a plurality of BB processors 826. For example, multiple BB processors 826 may be compatible with multiple frequency bands used by gNB 800. As shown in FIG. 19, the wireless communication interface 825 may include a plurality of RF circuits 827. For example, multiple RF circuits 827 may be compatible with multiple antenna elements. Although FIG. 19 shows an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 may also include a single BB processor 826 or a single RF circuit 827.

(Second application example)

FIG. 20 is a block diagram showing a second example of a schematic configuration of a gNB to which the technology of the present disclosure can be applied. The gNB 830 includes one or more antennas 840, base station equipment 850, and RRH 860. The RRH 860 and each antenna 840 may be connected to each other via an RF cable. The base station device 850 and the RRH 860 may be connected to each other via a high-speed line such as an optical fiber cable.

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

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, the memory 852, and the network interface 853 are the same as the controller 821, the memory 822, and the network interface 823 described with reference to FIG. 19.

The wireless communication interface 855 supports any cellular communication scheme (such as LTE and LTE-Advanced), and provides wireless communication to a terminal located in a sector corresponding to the RRH 860 via the RRH 860 and the antenna 840. The wireless communication interface 855 may generally include, for example, a BB processor 856. The BB processor 856 is the same as the BB processor 826 described with reference to FIG. 19 except that the BB processor 856 is connected to the RF circuit 864 of the RRH 860 via the connection interface 857. As shown in FIG. 20, the wireless communication interface 855 may include a plurality of BB processors 856. For example, multiple BB processors 856 may be compatible with multiple frequency bands used by gNB 830. Although FIG. 20 shows an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may also include a single BB processor 856.

The connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH 860. The connection interface 857 may also be a communication module used to connect the base station device 850 (wireless communication interface 855) to the communication in the above-mentioned high-speed line of the RRH 860.

The RRH 860 includes a connection interface 861 and a wireless communication interface 863.

The connection interface 861 is an interface for connecting the RRH 860 (wireless communication interface 863) to the base station device 850. The connection interface 861 may also be a communication module used for communication in the above-mentioned high-speed line.

The wireless communication interface 863 transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 may generally include, for example, an RF circuit 864. The RF circuit 864 may include, for example, a mixer, a filter, and an amplifier, and transmit and receive wireless signals via the antenna 840. As shown in FIG. 20, the wireless communication interface 863 may include a plurality of RF circuits 864. For example, multiple RF circuits 864 can support multiple antenna elements. Although FIG. 20 shows an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may also include a single RF circuit 864.

[3-3. Application examples of terminal equipment]

(First application example)

FIG. 21 is a block diagram showing an example of a schematic configuration of a smart phone 900 to which the technology of the present 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 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 An antenna switch 915, one or more antennas 916, a bus 917, a battery 918, and an auxiliary controller 919.

The processor 901 may be, for example, a CPU or a system on a chip (SoC), and controls the functions of the application layer and other layers 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 may include a storage medium such as a semiconductor memory and a hard disk. The external connection interface 904 is an interface for connecting an external device such as a memory card and a universal serial bus (USB) device to the smartphone 900.

The imaging device 906 includes an image sensor such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), and generates a captured image. The sensor 907 may include a group of sensors, such as a measurement sensor, a gyroscope sensor, a geomagnetic sensor, and an acceleration sensor. The microphone 908 converts the sound input to the smart phone 900 into an audio signal. The input device 909 includes, for example, a touch sensor, a keypad, a keyboard, a button, or a switch configured to detect a touch on the screen of the display device 910, and receives an operation 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 an output image of the smartphone 900. The speaker 911 converts the audio signal output from the smartphone 900 into sound.

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 may generally include, for example, a BB processor 913 and an RF circuit 914. The BB processor 913 may perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and perform various types of signal processing for wireless communication. Meanwhile, the RF circuit 914 may include, for example, a mixer, a filter, and an amplifier, and transmit and receive wireless signals via the antenna 916. The wireless communication interface 912 may be a chip module on which the BB processor 913 and the RF circuit 914 are integrated. As shown in FIG. 21, the wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914. Although FIG. 21 shows an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914, the wireless communication interface 912 may also include a single BB processor 913 or a single RF circuit 914.

In addition, in addition to the cellular communication scheme, the wireless communication interface 912 may support another type of wireless communication scheme, such as a short-range wireless communication scheme, a near field communication scheme, and a wireless local area network (LAN) scheme. In this case, the wireless communication interface 912 may include a BB processor 913 and an RF circuit 914 for each wireless communication scheme.

Each of the antenna switches 915 switches the connection destination of the antenna 916 among a plurality of circuits included in the wireless communication interface 912 (for example, circuits for different wireless communication schemes).

Each of the antennas 916 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna), and is used for the wireless communication interface 912 to transmit and receive wireless signals. As shown in FIG. 21, the smart phone 900 may include a plurality of antennas 916. Although FIG. 21 shows an example in which the smart phone 900 includes a plurality of antennas 916, the smart phone 900 may also include a single antenna 916.

In addition, the smart phone 900 may include an antenna 916 for each wireless communication scheme. In this case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.

The bus 917 connects the processor 901, the memory 902, the storage device 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other. connection. The battery 918 supplies power to each block of the smartphone 900 shown in FIG. 21 via a feeder line, and the feeder line is partially shown as a dashed line in the figure. The auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode, for example.

(Second application example)

FIG. 24 is a block diagram showing an example of a schematic configuration of a car navigation device 920 to which the technology of the present 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, wireless The communication interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.

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

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

The content player 927 reproduces content stored in a storage medium (such as CD and DVD), which is inserted into the storage medium interface 928. The input device 929 includes, for example, a touch sensor, a button, or a switch configured to detect a touch on the screen of the display device 930, and receives an operation or information input from the user. The display device 930 includes a screen such as an LCD or OLED display, and displays an image of a navigation function or reproduced content. The speaker 931 outputs the sound of the navigation function or the reproduced content.

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 may generally include, for example, a BB processor 934 and an RF circuit 935. The BB processor 934 may perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and perform various types of signal processing for wireless communication. Meanwhile, the RF circuit 935 may include, for example, a mixer, a filter, and an amplifier, and transmit and receive wireless signals via the antenna 937. The wireless communication interface 933 may also be a chip module on which the BB processor 934 and the RF circuit 935 are integrated. As shown in FIG. 24, the wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935. Although FIG. 24 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 may also include a single BB processor 934 or a single RF circuit 935.

In addition, in addition to the cellular communication scheme, the wireless communication interface 933 may support another type of wireless communication scheme, such as a short-range wireless communication scheme, a near field communication scheme, and a wireless LAN scheme. In this case, the wireless communication interface 933 may include a BB processor 934 and an RF circuit 935 for each wireless communication scheme.

Each of the antenna switches 936 switches the connection destination of the antenna 937 among a plurality of circuits included in the wireless communication interface 933, such as circuits for different wireless communication schemes.

Each of the antennas 937 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna), and is used for the wireless communication interface 933 to transmit and receive wireless signals. As shown in FIG. 24, the car navigation device 920 may include a plurality of antennas 937. Although FIG. 24 shows an example in which the car navigation device 920 includes a plurality of antennas 937, the car navigation device 920 may also include a single antenna 937.

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

The battery 938 supplies power to each block of the car navigation device 920 shown in FIG. 24 via a feeder line, and the feeder line is partially shown as a dashed line in the figure. The battery 938 accumulates electric power supplied from the vehicle.

The technology of the present disclosure may also be implemented as an in-vehicle system (or vehicle) 940 including one or more blocks in 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 failure information), and outputs the generated data to the in-vehicle network 941.

The various illustrative blocks and components described in conjunction with the present disclosure can be used as general-purpose processors, digital signal processors (DSP), ASICs, FPGAs or other programmable logic devices, discrete gates designed to perform the functions described herein. Or transistor logic, discrete hardware components, or any combination of them to implement or execute. A general-purpose processor may be a microprocessor, but in the alternative, 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 combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with DSP cores, and/or any other such configuration.

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 codes on the non-transitory computer-readable medium. Other examples and implementations are within the scope and spirit of the present disclosure and appended claims. For example, in view of the nature of software, the above-mentioned functions can be executed using software, hardware, firmware, hard-wired, or any combination of these executed by a processor. The features that realize the function can also be physically placed at various locations, including being distributed so that parts of the function are realized at different physical locations.

In addition, the disclosure of components contained in other components or separated from other components should be considered as exemplary, because a variety of other architectures can potentially be implemented to achieve the same function, including the incorporation of all, most, and And/or some of the elements are part of one or more single structures or separate structures.

The non-transitory computer-readable medium can be any available non-transitory medium that can be accessed by a general-purpose computer or a special-purpose computer. By way of example and not limitation, non-transitory computer readable media can include RAM, ROM, EEPROM, flash memory, CD-ROM, DVD or other optical disk storage, magnetic disk storage or other magnetic storage devices, or can be used to Carrying or storing the 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.

The previous description of the present disclosure is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure are obvious to those skilled in the art, and the general principles defined herein can be applied to other modifications without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but corresponds to the widest scope consistent with the disclosed principles and new features.

The embodiments of the present disclosure also include:

1. A network side device, comprising a processing circuit configured to:

Send multiple pairs of polarized transmission beams with different indication directions to the terminal-side device, where each pair of polarized transmission beams in the multiple pairs of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam having the same indication direction A polarization transmission beam, the first polarization transmission beam has a first polarization direction, and the second polarization transmission beam has a second polarization direction different from the first polarization direction;

Receiving a feedback signal from the terminal-side device, the feedback signal including beam identification information and cross-polarization ratio information of the polarized transmission beam selected by the terminal-side device from the multiple pairs of polarized transmission beams;

Based on the cross-polarization ratio information of the selected polarized transmission beam, it is determined whether the selected polarized transmission beam can be used for polarization multiplexing.

2. The network-side device according to item 1, wherein determining whether the selected polarized transmission beam can be used for polarization multiplexing includes: comparing the cross-polarization ratio of the selected polarized transmission beam with a polarization threshold, And when the cross polarization ratio of the selected polarized transmission beam is greater than or equal to the polarization threshold, it is determined that the selected polarized transmission beam can be used for polarization multiplexing.

3. The network side device according to item 1, wherein the first polarization transmission beam and the second polarization transmission 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.

4. The network side device according to item 1, wherein the cross-polarization ratio information includes the cross-polarization ratio.

5. The network-side device according to item 1, wherein the cross-polarization ratio information includes indicating the reception power of the selected polarization transmission beam and the reception of the polarization transmission beam paired with the selected polarization transmission beam Power information, and the processing circuit is configured to determine the selected pole by calculating the ratio of the received power of the selected polarized transmit beam to the received power of the polarized transmit beam paired with the selected polarized transmit beam Transmit the cross-polarization ratio of the beam.

6. The network side device according to item 1, wherein the received power of the selected polarized transmission beam at the terminal side device is higher than that of other polarized transmission beams in the plurality of pairs of polarized transmission beams. The received power at the terminal-side device.

7. The network side device according to item 1, wherein the multiple pairs of polarized transmission beams are transmitted in the following manner:

Transmit each pair of polarized transmit beams in the plurality of pairs of polarized transmit beams in sequence; or

Transmit the first polarization transmission beam with the first polarization direction among the pairs of polarization transmission beams, and then transmit the transmission beam with the second polarization direction among the pairs of polarization transmission beams The second polarization transmission beam.

8. The network-side device according to item 1, wherein the processing circuit passes the selected polarization transmission beams in the same time-frequency resource in the case of determining that the selected polarization transmission beam can be used for polarization multiplexing. The polarized transmission beam and the polarized transmission beam paired with the selected polarized transmission beam send data signals to the terminal-side device and another terminal-side device, or respectively pass the selected polarization in the same time-frequency resource The transmission beam and the polarized transmission beam having an indication direction adjacent to the selected polarized transmission beam transmits a data signal to the terminal-side device and the other terminal-side device.

9. The network side device according to item 1, wherein the processing circuit is configured to:

When it is determined that the selected polarization transmission beam can be used for polarization multiplexing, the selected polarization transmission beam and the polarization transmission paired with the selected polarization transmission beam are respectively used in the same time-frequency resource The beam sends the first signal and the second signal to the terminal side device.

10. The network side device according to item 1, wherein the processing circuit is configured to:

The selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam are periodically transmitted according to the cross polarization ratio monitoring period to monitor the cross polarization ratio of the selected polarization transmission beam.

11. The network side device according to item 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 according to item 1, wherein the processing circuit is further configured to:

When receiving the cross-polarization ratio monitoring request from the terminal-side device, transmit the selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam to monitor the selected polarization transmission The cross-polarization ratio of the beam.

13. The network-side device according to item 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 network-side device's polarization direction. -45 degree antenna polarization direction.

14. A terminal-side device, comprising a processing circuit configured to:

A plurality of pairs of polarized transmission beams with different indication directions are received from the network side device, and each pair of polarized transmission beams in the plurality of pairs of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam having the same indication direction. A polarization transmission beam, the first polarization transmission beam has a first polarization direction, and the second polarization transmission beam has a second polarization direction different from the first polarization direction;

Selecting a polarized transmission beam from the plurality of pairs of polarized transmission beams;

Sending a feedback signal to the network side device, where the feedback signal includes the beam identification information and the cross-polarization ratio information of the selected polarization transmission beam; and

In the case that the network-side device determines that the selected polarization transmission beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmission beam, the network-side device receives the pair of selected polarization transmission beams. Polarized transmission beams are polarized multiplexed signals.

15. The terminal-side device according to item 14, wherein the first polarization transmission beam and the second polarization transmission beam carry reference signals on different time-frequency resources, and the terminal-side device is based on the The reference signal determines the first received power of the first polarized transmit beam and the second received power of the second polarized transmit beam.

16. The terminal-side device according to item 14, wherein the cross-polarization ratio information of the selected polarized transmission beam includes at least one of the following:

The cross-polarization ratio of the selected polarized transmit beam; or

Information indicating the reception power of the selected polarization transmission beam and the reception power of the polarization transmission beam paired with the selected polarization transmission beam.

17. The terminal-side device according to item 14, wherein the received power of the selected polarization transmission beam at the terminal-side device is higher than that of other polarization transmission beams in the plurality of pairs of polarization transmission beams. The received power at the terminal-side device.

18. The terminal-side device according to item 14, wherein the multiple pairs of polarized transmission beams are received in the following manner:

Sequentially receive each pair of polarized transmission beams in the plurality of pairs of polarized transmission beams; or

Receive the first polarization transmission beam with the first polarization direction among the pairs of polarization transmission beams, and then receive the transmission beam with the second polarization direction among the pairs of polarization transmission beams The second polarization transmission beam.

19. A method of communication, including:

Receiving a feedback signal from the terminal-side device, where the feedback signal includes beam identification information and cross-polarization ratio information of the polarized transmission beam selected by the terminal-side device from the multiple pairs of polarized transmission beams;

20. A method of communication, including:

21. A network side device, comprising a processing circuit configured to:

A plurality of pairs of polarized receiving beams with different indicating directions are used to receive the uplink beam training signal from the terminal-side device, and each pair of polarized receiving beams of the plurality of pairs of polarized receiving beams includes the first polarization with the same indicating direction. A receiving beam and a second polarization receiving beam, the first polarization receiving beam having a first polarization direction, and the second polarization receiving beam having a second polarization direction different from the first polarization direction;

Selecting a polarized receiving beam from the polarized receiving beams in the plurality of pairs of polarized receiving beams, and using the polarization direction of the selected polarized receiving beam as the selected polarization direction;

Sending a plurality of polarized transmission beams with different indication directions to the terminal-side device, the plurality of polarized transmission beams having the selected polarization direction;

Receiving a feedback signal from the terminal-side device, the 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 the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, and determine whether the selected polarization transmission beam can be used for polarization based on the cross polarization ratio of the selected polarization transmission beam Reuse.

22. The network-side device according to item 21, wherein determining whether the selected polarized transmission beam can be used for polarization multiplexing includes: comparing the cross-polarization ratio of the selected polarized transmission beam with a polarization threshold, And when the cross polarization ratio of the selected polarized transmission beam is greater than or equal to the polarization threshold, it is determined that the selected polarized transmission beam can be used for polarization multiplexing.

23. The network-side device according to item 21, wherein determining the cross-polarization ratio of the selected polarized transmission beam includes:

Determining the cross-polarization ratio of the selected polarized receiving beam, and using the cross-polarization ratio of the selected polarized receiving beam as the cross-polarization ratio of the selected polarized transmitting beam,

Wherein, determining the cross-polarization ratio of the selected polarized receiving beam includes: determining the ratio of the received power of the selected polarized receiving beam to the received power of the polarized receiving beam paired with the selected polarized receiving beam .

24. The network-side device according to item 21, wherein determining the cross-polarization ratio of the selected polarized transmission beam includes:

Sending a polarized transmission beam paired with the selected polarized transmission beam to the terminal-side device;

The cross-polarization ratio information of the selected polarized transmission beam is received from the terminal-side device.

25. The network side device according to item 24, wherein the cross-polarization ratio information includes the cross-polarization ratio.

26. The network-side device according to item 24, wherein the cross-polarization ratio information includes indicating the reception power of the selected polarization transmission beam and the reception of the polarization transmission beam paired with the selected polarization transmission beam Power information, and the processing circuit is further configured to determine the selected polarization transmission beam by calculating the ratio of the received power of the selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam Polarize the cross-polarization ratio of the transmit beam.

27. The network-side device according to item 21, wherein the received power of the selected polarized receiving beam at the network-side device is higher than that of other polarized receiving beams in the plurality of pairs of polarized receiving beams. The received power at the network side device.

28. The network-side device according to item 21, wherein the received power of the selected polarization transmission beam at the terminal-side device is higher than that of other polarization transmission beams in the plurality of polarization transmission beams. The received power at the terminal-side device.

29. A terminal-side device, comprising a processing circuit configured to:

Send to the network side device an uplink beam training signal for selecting a polarized receiving beam from a plurality of pairs of polarized receiving beams with different indication directions, each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams includes The first polarization receiving beam and the second polarization receiving beam having the same indication direction, the first polarization receiving beam having a first polarization direction, and the second polarization receiving beam having the same direction as the first polarization direction. Different second polarization direction;

Receiving, from the network side device, multiple polarized transmission beams with different indication directions, where the polarization directions of the multiple polarization transmission beams are the same as the polarization directions of the polarization reception beams selected by the network side device;

Selecting a polarized transmission beam from the plurality of polarized transmission beams;

Sending a feedback signal to the network side device, where the feedback signal includes the beam identification information of the selected polarized transmission beam; and

In the case that the network-side device determines that the selected polarization transmission beam can be used for polarization multiplexing based on the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, the network The side device receives the polarization multiplexed signal.

30. The terminal-side device described in item 29 is configured as:

Receiving, from the network side device, a polarized transmission beam paired with the selected polarized transmission beam;

The cross-polarization ratio information of the selected polarization transmission beam is determined based on the selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam.

31. The terminal-side device according to item 30, wherein the cross-polarization ratio information of the selected polarized transmission beam includes at least one of the following:

The cross-polarization ratio of the selected polarized transmit beam; or

32. The terminal-side device according to item 29, wherein the received power of the selected polarization transmission beam at the terminal-side device is higher than that of other polarization transmission beams in the plurality of polarization transmission beams. The received power at the terminal-side device.

33. A method of communication, including:

34. A method of communication, including:

In the case that the network-side device determines that the selected polarization transmission beam can be used for polarization multiplexing based on the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, the selected polarization transmission beam can be used for polarization multiplexing. Polarized transmit beams are used for polarization multiplexing.

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

36. A communication device comprising components for executing each step of the communication method described in any one of items 19, 20, 33, and 34.

Claims

A network side device includes a processing circuit configured to:

Send multiple pairs of polarized transmission beams with different indication directions to the terminal-side device, where each pair of polarized transmission beams in the multiple pairs of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam having the same indication direction A polarization transmission beam, the first polarization transmission beam has a first polarization direction, and the second polarization transmission beam has a second polarization direction different from the first polarization direction;

Receiving a feedback signal from the terminal-side device, where the feedback signal includes beam identification information and cross-polarization ratio information of the polarized transmission beam selected by the terminal-side device from the multiple pairs of polarized transmission beams;

Based on the cross-polarization ratio information of the selected polarized transmission beam, it is determined whether the selected polarized transmission beam can be used for polarization multiplexing.
The network-side device according to claim 1, wherein determining whether the selected polarized transmission beam can be used for polarization multiplexing comprises: comparing the cross-polarization ratio of the selected polarized transmission beam with a polarization threshold, and In a case where the cross polarization ratio of the selected polarized transmission beam is greater than or equal to the polarization threshold, it is determined that the selected polarized transmission beam can be used for polarization multiplexing.
The network side device according to claim 1, wherein the first polarization transmission beam and the second polarization transmission beam carry reference signals on different time-frequency resources, and the reference signals are used to determine the The first received power of the first polarized transmit beam and the second received power of the second polarized transmit beam.
The network side device according to claim 1, wherein the cross-polarization ratio information includes a cross-polarization ratio.
The network side device according to claim 1, wherein the cross-polarization ratio information includes indicating the received power of the selected polarized transmission beam and the received power of the polarized transmission beam paired with the selected polarized transmission beam The processing circuit is configured to determine the selected polarization by calculating the ratio of the received power of the selected polarized transmission beam to the received power of the polarized transmission beam paired with the selected polarized transmission beam The cross polarization ratio of the transmit beam.
The network side device according to claim 1, wherein the received power of the selected polarized transmission beam at the terminal side device is higher than that of other polarized transmission beams in the plurality of pairs of polarized transmission beams. The received power at the terminal-side device.
The network side device according to claim 1, wherein the multiple pairs of polarized transmission beams are transmitted in the following manner:

Transmit each pair of polarized transmit beams in the plurality of pairs of polarized transmit beams in sequence; or

Transmit the first polarization transmission beam with the first polarization direction among the pairs of polarization transmission beams, and then transmit the first polarization transmission beam with the second polarization direction among the pairs of polarization transmission beams The second polarization transmit beam.
The network-side device according to claim 1, wherein the processing circuit, in the case of determining that the selected polarized transmission beam can be used for polarization multiplexing, respectively passes the selected polarities in the same time-frequency resource. The polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam send data signals to the terminal-side device and another terminal-side device, or transmit data signals through the selected polarization in the same time-frequency resource. The beam and the polarized transmission beam having an indication direction adjacent to the selected polarized transmission beam transmits a data signal to the terminal-side device and the other terminal-side device.
The network side device according to claim 1, wherein the processing circuit is configured to:

When it is determined that the selected polarization transmission beam can be used for polarization multiplexing, the selected polarization transmission beam and the polarization transmission paired with the selected polarization transmission beam are respectively used in the same time-frequency resource The beam sends the first signal and the second signal to the terminal side device.
The network side device according to claim 1, wherein the processing circuit is configured to:

The selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam are periodically transmitted according to the cross polarization ratio monitoring period to monitor the cross polarization ratio of the selected polarization transmission beam.
The network side device according to 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.
The network side device according to claim 1, wherein the processing circuit is further configured to:

When receiving the cross-polarization ratio monitoring request from the terminal-side device, transmit the selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam to monitor the selected polarization transmission The cross-polarization ratio of the beam.
The network side device according to 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 − 45 degree antenna polarization direction.
A terminal-side device includes a processing circuit configured to:

A plurality of pairs of polarized transmission beams with different indication directions are received from the network-side device, and each pair of polarized transmission beams in the plurality of pairs of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam having the same indication direction. A polarization transmission beam, the first polarization transmission beam has a first polarization direction, and the second polarization transmission beam has a second polarization direction different from the first polarization direction;

Selecting a polarized transmission beam from the plurality of pairs of polarized transmission beams;

Sending a feedback signal to the network side device, where the feedback signal includes the beam identification information and the cross-polarization ratio information of the selected polarization transmission beam; and

In the case that the network-side device determines that the selected polarization transmission beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmission beam, the network-side device receives the pair of selected polarization transmission beams. Polarized transmission beams are polarized multiplexed signals.
The terminal-side device according to claim 14, wherein the first polarization transmission beam and the second polarization transmission beam carry reference signals on different time-frequency resources, and the terminal-side device is based on the reference signal. The signal determines the first received power of the first polarized transmit beam and the second received power of the second polarized transmit beam.
The terminal-side device according to claim 14, wherein the cross-polarization ratio information of the selected polarized transmission beam includes at least one of the following:

The cross-polarization ratio of the selected polarized transmit beam; or

Information indicating the reception power of the selected polarization transmission beam and the reception power of the polarization transmission beam paired with the selected polarization transmission beam.
The terminal-side device according to claim 14, wherein the received power of the selected polarization transmission beam at the terminal-side device is higher than that of other polarization transmission beams in the plurality of pairs of polarization transmission beams. The received power at the terminal-side device.
The terminal-side device according to claim 14, wherein the multiple pairs of polarized transmission beams are received in the following manner:

Sequentially receive each pair of polarized transmission beams in the plurality of pairs of polarized transmission beams; or

Receive the first polarization transmission beam with the first polarization direction among the pairs of polarization transmission beams, and then receive the transmission beam with the second polarization direction among the pairs of polarization transmission beams The second polarization transmission beam.
A communication method including:

Send multiple pairs of polarized transmission beams with different indication directions to the terminal-side device, where each pair of polarized transmission beams in the multiple pairs of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam having the same indication direction A polarization transmission beam, the first polarization transmission beam has a first polarization direction, and the second polarization transmission beam has a second polarization direction different from the first polarization direction;

Receiving a feedback signal from the terminal-side device, where the feedback signal includes beam identification information and cross-polarization ratio information of the polarized transmission beam selected by the terminal-side device from the multiple pairs of polarized transmission beams;

Based on the cross-polarization ratio information of the selected polarized transmission beam, it is determined whether the selected polarized transmission beam can be used for polarization multiplexing.
A communication method including:

A plurality of pairs of polarized transmission beams with different indication directions are received from the network side device, and each pair of polarized transmission beams in the plurality of pairs of polarized transmission beams includes a first polarized transmission beam and a second polarized transmission beam having the same indication direction. A polarization transmission beam, the first polarization transmission beam has a first polarization direction, and the second polarization transmission beam has a second polarization direction different from the first polarization direction;

Selecting a polarized transmission beam from the plurality of pairs of polarized transmission beams;

Sending a feedback signal to the network side device, where the feedback signal includes the beam identification information and the cross-polarization ratio information of the selected polarization transmission beam; and

In the case that the network-side device determines that the selected polarization transmission beam can be used for polarization multiplexing based on the cross-polarization ratio information of the selected polarization transmission beam, the network-side device receives the pair of selected polarization transmission beams. Polarized transmission beams are polarized multiplexed signals.
A network side device includes a processing circuit configured to:

A plurality of pairs of polarized receiving beams with different indicating directions are used to receive the uplink beam training signal from the terminal-side device, and each pair of polarized receiving beams of the plurality of pairs of polarized receiving beams includes the first polarization with the same indicating direction. A receiving beam and a second polarization receiving beam, the first polarization receiving beam having a first polarization direction, and the second polarization receiving beam having a second polarization direction different from the first polarization direction;

Selecting a polarized receiving beam from the polarized receiving beams in the plurality of pairs of polarized receiving beams, and using the polarization direction of the selected polarized receiving beam as the selected polarization direction;

Sending a plurality of polarized transmission beams with different indication directions to the terminal-side device, the plurality of polarized transmission beams having the selected polarization direction;

Receiving a feedback signal from the terminal-side device, the 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 the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, and determine whether the selected polarization transmission beam can be used for polarization based on the cross polarization ratio of the selected polarization transmission beam Reuse.
The network side device according to claim 21, wherein determining whether the selected polarized transmission beam can be used for polarization multiplexing comprises: comparing the cross-polarization ratio of the selected polarized transmission beam with a polarization threshold, and In a case where the cross polarization ratio of the selected polarized transmission beam is greater than or equal to the polarization threshold, it is determined that the selected polarized transmission beam can be used for polarization multiplexing.
The network side device according to claim 21, wherein determining the cross polarization ratio of the selected polarization transmission beam comprises:

Determining the cross-polarization ratio of the selected polarized receiving beam, and using the cross-polarization ratio of the selected polarized receiving beam as the cross-polarization ratio of the selected polarized transmitting beam,

Wherein, determining the cross-polarization ratio of the selected polarized receiving beam includes: determining the ratio of the received power of the selected polarized receiving beam to the received power of the polarized receiving beam paired with the selected polarized receiving beam .
The network side device according to claim 21, wherein determining the cross polarization ratio of the selected polarization transmission beam comprises:

Sending a polarized transmission beam paired with the selected polarized transmission beam to the terminal-side device;

The cross-polarization ratio information of the selected polarized transmission beam is received from the terminal-side device.
The network side device according to claim 24, wherein the cross-polarization ratio information includes the cross-polarization ratio.
The network side device according to claim 24, wherein the cross-polarization ratio information includes indicating the received power of the selected polarized transmission beam and the received power of the polarized transmission beam paired with the selected polarized transmission beam The processing circuit is further configured to determine the selected polarization by calculating the ratio of the received power of the selected polarization transmission beam to the polarization transmission beam paired with the selected polarization transmission beam Reduce the cross-polarization ratio of the transmit beam.
The network side device according to claim 21, wherein the received power of the selected polarized receiving beam at the network side device is higher than that of other polarized receiving beams in the plurality of pairs of polarized receiving beams. The received power at the network side device.
21. The network-side device according to claim 21, wherein the received power of the selected polarization transmission beam at the terminal-side device is higher than that of other polarization transmission beams in the plurality of polarization transmission beams. The received power at the terminal-side device.
A terminal-side device includes a processing circuit configured to:

Send to the network-side device an uplink beam training signal for selecting a polarized receiving beam from a plurality of pairs of polarized receiving beams with different indication directions, and each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams includes The first polarization receiving beam and the second polarization receiving beam having the same indication direction, the first polarization receiving beam having a first polarization direction, and the second polarization receiving beam having the same direction as the first polarization direction. Different second polarization direction;

Receiving, from the network side device, multiple polarized transmission beams with different indication directions, where the polarization directions of the multiple polarization transmission beams are the same as the polarization directions of the polarization reception beams selected by the network side device;

Selecting a polarized transmission beam from the plurality of polarized transmission beams;

Sending a feedback signal to the network side device, where the feedback signal includes the beam identification information of the selected polarized transmission beam; and

In the case that the network-side device determines that the selected polarization transmission beam can be used for polarization multiplexing based on the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, the network The side device receives the polarization multiplexed signal.
The terminal-side device according to claim 29, configured to:

Receiving, from the network side device, a polarized transmission beam paired with the selected polarized transmission beam;

The cross-polarization ratio information of the selected polarization transmission beam is determined based on the selected polarization transmission beam and the polarization transmission beam paired with the selected polarization transmission beam.
The terminal-side device according to claim 30, wherein the cross-polarization ratio information of the selected polarized transmission beam includes at least one of the following:

The cross-polarization ratio of the selected polarized transmit beam; or

Information indicating the reception power of the selected polarization transmission beam and the reception power of the polarization transmission beam paired with the selected polarization transmission beam.
The terminal-side device according to claim 29, wherein the received power of the selected polarization transmission beam at the terminal-side device is higher than that of other polarization transmission beams in the plurality of polarization transmission beams. The received power at the terminal-side device.
A communication method including:

A plurality of pairs of polarized receiving beams with different indicating directions are used to receive the uplink beam training signal from the terminal-side device, and each pair of polarized receiving beams of the plurality of pairs of polarized receiving beams includes the first polarization with the same indicating direction. A receiving beam and a second polarization receiving beam, the first polarization receiving beam having a first polarization direction, and the second polarization receiving beam having a second polarization direction different from the first polarization direction;

Selecting a polarized receiving beam from the polarized receiving beams in the plurality of pairs of polarized receiving beams, and using the polarization direction of the selected polarized receiving beam as the selected polarization direction;

Sending a plurality of polarized transmission beams with different indication directions to the terminal-side device, the plurality of polarized transmission beams having the selected polarization direction;

Receiving a feedback signal from the terminal-side device, the 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 the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, and determine whether the selected polarization transmission beam can be used for polarization based on the cross polarization ratio of the selected polarization transmission beam Reuse.
A communication method including:

Send to the network-side device an uplink beam training signal for selecting a polarized receiving beam from a plurality of pairs of polarized receiving beams with different indication directions, and each pair of polarized receiving beams in the plurality of pairs of polarized receiving beams includes The first polarization receiving beam and the second polarization receiving beam having the same indication direction, the first polarization receiving beam having a first polarization direction, and the second polarization receiving beam having the same direction as the first polarization direction. Different second polarization direction;

Receiving, from the network side device, multiple polarized transmission beams with different indication directions, where the polarization directions of the multiple polarization transmission beams are the same as the polarization directions of the polarization reception beams selected by the network side device;

Selecting a polarized transmission beam from the plurality of polarized transmission beams;

Sending a feedback signal to the network side device, where the feedback signal includes the beam identification information of the selected polarized transmission beam; and

In the case that the network-side device determines that the selected polarization transmission beam can be used for polarization multiplexing based on the cross polarization ratio of the selected polarization transmission beam indicated by the beam identification information, the selected polarization transmission beam can be used for polarization multiplexing. Polarized transmit beams are used for polarization multiplexing.
A non-transitory computer-readable storage medium having instructions stored thereon, which when executed by a processor causes the processor to execute the communication method according to any one of claims 19, 20, 33, and 34.
A communication device, comprising components for executing each step of the communication method described in any one of claims 19, 20, 33, and 34.