CN116800317A

CN116800317A - Method and apparatus for preventing erroneous PMI reporting in wireless communication system

Info

Publication number: CN116800317A
Application number: CN202310282463.0A
Authority: CN
Inventors: 吴眕宇; 尹泓植; 李俊镐
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2022-03-21
Filing date: 2023-03-21
Publication date: 2023-09-22

Abstract

A wireless communication device comprising: communication circuitry configured to receive a channel state information reference signal (CSI-RS); a processor including an angle of departure (AoD) monitoring circuit configured to extract an AoD value corresponding to a received CSI-RS, and an interference cancellation circuit configured to cancel a second AoD value of the AoD values corresponding to an interfering cell adjacent to the serving cell except for the first AoD value corresponding to the serving cell; and a memory storing a first AoD value corresponding to the serving cell and antenna array information of the serving cell.

Description

Method and apparatus for preventing erroneous PMI reporting in wireless communication system

Cross Reference to Related Applications

The present application is based on and claims the priority and rights of korean patent application No. 10-2022-0034940 filed on 3/21 of 2022 and korean patent application No. 10-2022-0104331 filed on 8/19 of 2022, the disclosures of which are incorporated herein by reference in their entireties.

Technical Field

The present disclosure describes a method and apparatus for transmitting a Precoding Matrix Indicator (PMI) report, and in some embodiments, a method and apparatus for preventing erroneous PMI reports in a wireless communication system.

Background

Since the commercialization of the 4 th generation (4G) communication system, the demand for wireless data services has increased. Accordingly, an improved generation 5 (5G) communication system or quasi-5G communication system, which is called a New Radio (NR) system in the 3GPP standard, is being developed.

Consider implementing a 5G communication system in an ultra-high frequency (mmWave) band (e.g., 28GHz band or 39GHz band) to achieve high data transmission rates. In some cases, techniques such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming, and massive antennas are used for 5G communication systems. Such a technique can be used to reduce the path loss of radio waves and increase the transmission distance of radio waves in the ultra-high frequency band.

Disclosure of Invention

The present disclosure describes a method and system for wireless communication. Embodiments of the present disclosure include an electronic device for monitoring an departure angle (AoD) of a serving cell. In some cases, the apparatus selects a Precoding Matrix Indicator (PMI) in addition to channel state information reference signals (CSI-RS) received through a different AoD than the monitored AoD.

According to an aspect of the present disclosure, there is provided a wireless communication device including a communication circuit, a processor, and a memory. The communication circuitry may be configured to receive CSI-RS. The processor includes an AoD monitoring circuit and an interference cancellation circuit. The AoD monitoring circuit is configured to extract an AoD value corresponding to the received CSI-RS. The interference cancellation circuit is configured to cancel a second AoD value corresponding to an interfering cell adjacent to the serving cell. The interference cancellation circuit may cancel a value other than the first AoD value corresponding to the serving cell among the AoD values. A memory in the wireless communication device stores a first AoD value corresponding to a serving cell and antenna array information for the serving cell.

According to another aspect of the present disclosure, a method of operating a wireless communication device is provided. The method includes receiving a CSI-RS, extracting an AoD value corresponding to the received CSI-RS, and classifying the AoD value into a first AoD value corresponding to a serving cell and a second AoD value corresponding to an interfering cell adjacent to the serving cell.

According to an aspect of the present disclosure, there is provided a wireless communication system including a serving cell configured to transmit a first CSI-RS and antenna array information, an interfering cell configured to transmit a second CSI-RS, and a wireless communication apparatus configured to receive the first CSI-RS and the second CSI-RS. The wireless communication device includes a communication circuit, a processor, and a memory. The communication circuitry is configured to receive a CSI-RS comprising a first CSI-RS and a second CSI-RS. The processor is configured to extract an AoD value corresponding to the received CSI-RS and classify the AoD value into a first AoD value corresponding to a serving cell and a second AoD value corresponding to an interfering cell. The memory stores a first AoD value corresponding to a serving cell and antenna array information of the serving cell.

According to an aspect of the present disclosure, there is provided a wireless communication system that receives a first CSI-RS from a serving cell and a second CSI-RS from an interfering cell. The processor calculates a first AoD value based on the first CSI-RS and calculates a second AoD value based on the second CSI-RS. In addition, the processor communicates with the serving cell based on the first AoD value and a determination that the second AoD value corresponds to the interfering cell.

Other features and aspects will be apparent from the following detailed description, the accompanying drawings, and the claims.

Drawings

Embodiments of the present disclosure may be understood from the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 illustrates a wireless communication system according to an embodiment;

fig. 2 is a block diagram of a base station according to some embodiments;

FIG. 3 is a block diagram of an electronic device according to some embodiments;

fig. 4A shows an example of a detailed configuration of the communication circuit of fig. 3;

fig. 4B illustrates an example of a detailed configuration of the communication circuit of fig. 3;

fig. 5 is a flow chart illustrating a method of operating a User Equipment (UE) in accordance with some embodiments;

fig. 6 illustrates a diagram of converting the result of channel state information reference signal (CSI-RS) channel estimation to the spatial domain, in accordance with some embodiments;

FIG. 7 is a flow chart illustrating a method of extracting an angle of departure (AoD) value, according to some embodiments;

FIG. 8 is a flow chart illustrating a method of determining performance of a handoff in accordance with some embodiments; and

fig. 9 is a block diagram of a wireless communication device according to some embodiments.

Detailed Description

The present disclosure relates to wireless communication systems. Embodiments of the present disclosure include an electronic device for monitoring an departure angle (AoD) of a serving cell. In some cases, the apparatus selects a Precoding Matrix Indicator (PMI) in addition to channel state information reference signals (CSI-RS) received through a different AoD than the monitored AoD.

Conventional electronic devices may enter the covered edge region of the serving cell. In this case, the legacy electronic device may receive the CSI-RS of the interfering cell and the CSI-RS of the serving cell. As a result, the electronic device may select a PMI directed to an interfering cell that adversely affects PMI information reported to the base station.

Accordingly, embodiments of the present disclosure include an electronic device configured to track and store an AoD value of a serving cell and extract the AoD value of a received CSI-RS. In some cases, when the AoD value of the received CSI-RS includes an AoD value that is not the stored AoD value, the electronic device removes an AoD value that does not correspond to the stored AoD value. The electronics remove the AoD values by treating them as CSI-RS of the interfering cell and calculate an effective channel for the serving cell. Accordingly, the influence of CSI-RS transmitted from the interfering cell may be removed, and PMI information optimized for the serving cell may be reported to the base station.

Embodiments of the present disclosure include a wireless communication device, wherein the wireless communication device includes a communication circuit, a processor, and a memory. The communication circuitry is configured to receive the CSI-RS. The processor further includes an angle of departure (AoD) monitoring circuit and an interference cancellation circuit. The AoD monitoring circuit is configured to extract an AoD value corresponding to the received CSI-RS, and the interference cancellation circuit is configured to cancel the second AoD value. In some cases, the second AoD value corresponds to an interfering cell adjacent to the serving cell in addition to the first AoD value corresponding to the serving cell in the AoD values. The memory stores a first AoD value corresponding to a serving cell and antenna array information of the serving cell. Accordingly, by removing the AoD value of the CSI-RS considered as the interfering cell, it is possible to remove the influence of the CSI-RS from the interfering cell and not select the PMI directed to the interfering cell, thereby producing an efficient wireless communication system.

According to an aspect of the present disclosure, there is provided a wireless communication system, wherein the wireless communication system receives a first CSI-RS from a serving cell and a second CSI-RS from an interfering cell. The processor calculates a first AoD value based on the first CSI-RS and calculates a second AoD value based on the second CSI-RS. In addition, the processor communicates with the serving cell based on the first AoD value and a determination that the second AoD value corresponds to the interfering cell.

The following detailed description is provided to assist the reader in obtaining a comprehensive understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example and is not limited to those set forth herein, but may be altered as will be apparent after an understanding of the disclosure of the application, except for operations that must occur in a specific order. The features described herein may be embodied in different forms and should not be construed as limited to the example embodiments described herein. Rather, the example embodiments described herein are provided merely to illustrate some of many possible ways to implement the methods, devices, and/or systems described herein, which will be apparent upon an understanding of the present disclosure.

The disclosure may be modified in numerous alternative forms, and thus specific embodiments will be illustrated in the drawings and described in detail. In this specification, when an element (or region, layer, section, etc.) is referred to as being "on," "connected to," or "coupled to" another element, it means that the element can be directly on/connected to/coupled to the other element or a third element can be disposed therebetween.

Like reference numerals may refer to like components throughout the specification and drawings. It should be noted that although the drawings are intended to illustrate actual relative dimensions of certain embodiments of the present disclosure, the present disclosure is not necessarily limited to the illustrated embodiments. The term "and/or" includes all combinations of one or more associated configurations that may be defined.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various components, these components are not necessarily limited by these terms. These terms are only used to distinguish one element from another element. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the scope of the inventive concept. Terms in the singular may include plural unless the context clearly indicates otherwise.

In addition, terms such as "below," "above," and "over" may be used to describe the relationship between components illustrated in the figures. These terms are used as relative concepts and are described with reference to the directions indicated in the drawings. It will be understood that the terms "comprises," "comprising," "includes" or "having," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

Embodiments of the present disclosure include operator services based on New Radio (NR) networks. For example, the operator service may be a wholesale operator service (WCS), in particular a 3GPP release. However, the present disclosure is not limited to NR networks, and may be applied to other wireless communication systems having similar technical backgrounds or channel configurations.

Hereinafter, a wireless communication system of an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings, in which an electronic device tracks and stores an AoD value of a serving cell and a received CSI-RS of an interfering cell to identify an effective channel for the serving cell.

Fig. 1 illustrates a wireless communication system according to some embodiments.

Referring to fig. 1, a wireless communication system may include a wireless communication device 120, a serving base station 110, and an interfering base station 130. Hereinafter, the wireless communication apparatus 120 may be referred to as a User Equipment (UE) 120, the serving base station 110 may be referred to as a serving cell 110, and the interfering base station 130 may be referred to as an interfering cell 130. Although the wireless communication system is shown to include the serving cell 110, the interfering cell 130, and one UE120 for convenience of description, the inventive concept is not limited thereto. According to some embodiments, a wireless communication system may include a plurality of base stations and a plurality of UEs.

A Base Station (BS) may be a station that communicates with a UE. Each base station may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to a coverage area of a base station and/or a coverage area depending on the context in which the term is used. In an NR system, the terms "cell" and NB, next generation NB (gNB), 5G NB, access Point (AP), BS, NR BS, or transmission-reception point (TRP) may be interchangeable. In some examples, the cells may not necessarily be stationary, and the geographic area of the cells may move according to the location of the mobile base station. In some examples, the base stations may be interconnected with each other and/or to one or more other base stations or network nodes (not shown) in the wireless network through various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.) using any suitable transmission network. The base station may provide wireless broadband access to user equipment within its coverage area.

A user equipment may be mobile and may refer to any device capable of communicating with a base station to send and receive data and/or control information. For example, a user equipment may be referred to as a terminal, a terminal device, a Mobile Station (MS), a Mobile Terminal (MT), a User Terminal (UT), a Subscriber Station (SS), a wireless device, a handheld device, and so on.

Serving cell 110 may be connected to UE 120 via a wireless channel and thus provide various communication services. The serving cell 110 may provide services regarding user traffic through a shared channel and may perform scheduling by collecting status information. In some examples, the status information may include a buffer status, an available transmit power status, and a channel status of UE 120. A wireless communication system may support beamforming techniques by using Orthogonal Frequency Division Multiplexing (OFDM) as a radio access technology. In addition, the wireless communication system can transmit and receive signals by using a wide frequency band existing in a frequency band of 6GHz or higher. For example, wireless communication systems may increase data transmission rates by using millimeter-wave frequency bands such as the 28GHz band or the 60GHz band. Wireless communication systems may support transmission and reception based on directional beams generated using multiple antennas to ensure coverage because the amplitude of signal attenuation according to distance is relatively large in the millimeter wave band.

Beamforming refers to a technique used in signal processing for directional signal transmission or reception. In some cases, beamforming may be performed by combining elements in an antenna array such that signals at a particular angle experience constructive interference while the remaining signals experience destructive interference. Beamforming may be performed on the transmit and receive sides to control the phase and relative amplitude of the signal at each transmitter. Thus, patterns of constructive and destructive interference are achieved in the wavefront, resulting in spatial selectivity.

The wireless communication system may be a system supporting Multiple Input Multiple Output (MIMO), and thus, serving cell 110 and UE 120 may support beamforming techniques. Beamforming techniques may be categorized as digital beamforming, analog beamforming, hybrid beamforming, and the like.

Referring to fig. 1, a serving cell 110 may transmit a first channel state information reference signal (CSI-RS) to a UE 120. For example, UE 120 may receive the CSI-RS and the CSI-RS may be a first CSI-RS from a first cell or serving cell 110. UE 120 may estimate a wireless channel between serving cell 110 and UE 120 by using CSI-RS. UE 120 may generate CSI feedback information including at least one of a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI) based on a result of the channel estimation. UE 120 may send a CSI report including CSI feedback information to serving cell 110.

In some cases, the communication device may perform channel estimation by generating CSI, which refers to information describing channel properties of the communication link. For example, CSI may be determined by analyzing a reference signal of a transmitter. In some cases, CSI may describe how a signal propagates from a transmitter to a receiver and may represent a combined effect of, for example, scattering, fading, and power attenuation. After generating CSI, this information can be used to adapt the transmission and reception process to the current channel conditions. This may lead to an increase in the rate and reliability of communications, especially in multi-antenna systems. In some cases, CSI is estimated at the receiver providing feedback to the transmitter (although reverse link estimation is also possible). In some cases, the transmitter and the receiver may have different CSI.

According to embodiments of the present disclosure, interfering cell 130 may transmit a second CSI-RS to UE 120. For example, UE 120 may receive the CSI-RS and the CSI-RS may be a second CSI-RS from a second cell or interfering cell 130. Here, the resources allocated to the transmission of the CSI-RS by the interfering cell 130 may be the same as the resources allocated to the transmission of the CSI-RS by the serving cell 110. For example, when the resources for transmitting the CSI-RS are insufficient, the pseudo random sequence may not work properly. Accordingly, since the pseudo random sequence does not work properly, an interference channel caused by the interfering cell 130 is not spatially whitened, and the UE 120 may recognize the interference channel, thereby receiving the second CSI-RS as an interference signal.

Fig. 2 is a block diagram of a serving base station according to some embodiments.

Referring to fig. 2, the serving base station may include a wireless communication circuit 210, a backhaul communication circuit 220, a memory 230, and a control circuit 240.

The wireless communication circuit 210 may perform functions for transmitting and receiving signals through a wireless channel. According to an embodiment, the wireless communication circuit 210 may perform a conversion function between a baseband signal and a bit string according to a physical layer specification of a system. For example, the wireless communication circuit 210 may generate complex symbols by encoding and modulating a transmission bit string during data transmission, and may recover a reception bit string by demodulating and decoding a baseband signal during data reception. In addition, the wireless communication circuit 210 may up-convert a baseband signal into a Radio Frequency (RF) band signal and then transmit the RF band signal through an antenna, or may down-convert an RF band signal received through an antenna into a baseband signal. Thus, the wireless communication circuit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and the like.

The wireless communication circuit 210 may transmit and receive signals. For example, the wireless communication circuit 210 may transmit synchronization signals, reference signals, system information, messages, control information, data, and the like. In addition, the wireless communication circuit 210 may perform beamforming. The wireless communication circuit 210 may apply beamforming weights to the signals to provide directionality to the signals intended to be transmitted and received. The wireless communication circuit 210 may repeat transmitting signals by changing the formed beam.

Backhaul communication circuit 220 provides an interface for performing communications with other nodes in the network. Accordingly, the backhaul communication circuit 220 may convert a bit string transmitted from the serving base station 110 to another node (e.g., another access node, another base station, an upper node, a core network, etc.) into a physical signal, and may convert a physical signal received from the other node into a bit string.

Memory 230 stores basic programs, applications, and data, such as configuration information, for operating serving base station 110. Memory 230 may include volatile memory, nonvolatile memory, or a combination of volatile and nonvolatile memory. For example, the memory 230 may store antenna array information corresponding to information on a panel structure, the number of operation panels, etc. of the interfering base station 130 adjacent to the serving base station 110.

Memory 230 refers to a memory device. Examples of memory devices include random access memory (RA M), read Only Memory (ROM), or hard disk. Examples of memory devices include solid state memory and hard drives. In some examples, memory 230 is used to store computer-readable, computer-executable software comprising instructions that, when executed, cause a processor to perform the various functions described herein. In some cases, memory 230 includes, among other things, a basic input/output system (BIOS) that controls basic hardware or software operations, such as interactions with peripheral components or devices. In some cases, the memory controller operates the memory cells. For example, the memory controller may include a row decoder, a column decoder, or both. In some cases, memory cells within a memory store information in the form of logical states.

The control circuit 240 controls the operation of the serving base station 110. For example, the control circuit 240 transmits and receives signals through the wireless communication circuit 210 or the backhaul communication circuit 220. In addition, the control circuit 240 writes data to the memory 230 and reads data from the memory 230. Accordingly, the control circuit 240 may include at least one processor.

The processor is a smart hardware device (e.g., a general purpose processing component, a Digital Signal Processor (DSP), a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a microcontroller, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor is configured to operate the memory array using the memory controller. In other cases, the memory controller is integrated into the processor. In some cases, the processor is configured to execute computer-readable instructions stored in the memory to perform various functions. In some embodiments, the processor includes dedicated components for modem processing, baseband processing, digital signal processing, or transmission processing.

Fig. 3 is a block diagram of UE 120 in accordance with some embodiments.

Referring to fig. 3, ue 120 may include communication circuitry 310, memory 320, and processor 330.

The communication circuit 310 performs a function for transmitting and receiving signals through a wireless channel. For example, the communication circuit 310 performs a conversion function between a baseband signal and a bit string according to a physical layer specification of the system. For example, the communication circuit 310 may generate complex symbols by encoding and modulating a transmit bit string during data transmission. In addition, the communication circuit 310 may recover the received bit string by demodulating and decoding the baseband signal during data reception.

The communication circuit 310 may up-convert the baseband signal into an RF band signal and then transmit the RF band signal through an antenna, or may down-convert the RF band signal received through the antenna into a baseband signal. For example, the communication circuit 310 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. The communication circuit 310 may perform beamforming. The communication circuit 310 may apply beamforming weights to the signals to provide directionality to the signals intended to be transmitted and received.

An antenna finger may include a single antenna or a wireless device with more than one antenna. For example, an antenna may be capable of transmitting or receiving multiple wireless transmissions concurrently. In some cases, the wireless communication device may include an antenna array.

The communication circuit 310 may transmit and receive signals. The communication circuit 310 may receive a downlink signal. The downlink signals may include synchronization signals, reference signals, system information, configuration messages, control information, downlink data, and the like. For example, UE 120 may receive CSI-RS from serving cell 110. Further, the communication circuit 310 may transmit an uplink signal. The uplink signal may include a random access related signal, a reference signal (e.g., a Sounding Reference Signal (SRS) or DM-RS), uplink data, etc. For example, UE 120 may send a CSI report to serving cell 110. The CSI report may include CSI feedback information. The CSI feedback information may include at least one of RI, PMI, and CQI based on channel estimation performed based on CSI-RS received by UE 120 from serving cell 110.

Memory 320 may store basic routines, applications, and data, such as configuration information, for operating UE 120. Memory 320 may include volatile memory, nonvolatile memory, or a combination of volatile and nonvolatile memory. In addition, the memory 320 may provide stored data upon request from the processor 330.

The processor 330 may control the overall operation of the UE. For example, the processor 330 may send and receive signals through the communication circuit 310. In addition, the processor 330 may write data to the memory 320 and read data from the memory 320. For example, the processor 330 may store AoD information of CSI-RS received from the serving cell 110 in the memory 320. As another example, the processor 330 may store antenna array information of the interfering cell 130 received from the serving cell 110 through at least one of RRC signaling, a Medium Access Control (MAC) Control Element (CE), and a Downlink Control Indicator (DCI). Accordingly, memory 320 may include or be part of at least one processor or microprocessor. When memory 320 is part of a processor, communication circuit 310 and part of processor 330 may be collectively referred to as a Communication Processor (CP).

According to an embodiment of the present disclosure, the processor 330 may further include an AoD monitoring circuit 331. The AoD monitoring circuit 331 may perform channel estimation on the CSI-RS received by the UE 120, and may extract a main AoD component in the received CSI-RS by performing correlation analysis on the estimated channel. For example, the processor 330 may have received antenna array information for the serving cell 110 from the serving cell 110 and may store the antenna array information in the memory 320. The antenna array information of the serving cell 110 may be transmitted to the UE 120 through one of RRC signaling, MAC CE, and DCI. The processor 330 may generate an array response vector for the serving cell 110 based on the antenna array information for the serving cell 110.

According to an embodiment, the processor 330 may extract the AoD value of the serving cell 110 by performing a correlation analysis on the channel estimated for the CSI-RS and the array response vector of the serving cell 110. As another example, the processor 330 may have received antenna array information for the interfering cell 130 from the serving cell 110 and may store the antenna array information in the memory 320. The antenna array information of the serving cell 110 may be transmitted to the UE 120 through one of RRC signaling, MAC CE, and DCI. The processor 330 may generate an array response vector for the interfering cell 130 based on the antenna array information for the interfering cell 130. Processor 330 may extract the AoD value of interfering cell 130 by performing a correlation analysis on the channel estimated for CSI-RS and the array response vector of interfering cell 130.

For example, RRC or radio resource control signaling may be used as a communication link between two stations in mobile or wireless communications. In some cases, the link may include a physical layer and a data link layer of an open system model for the connection. RRC signaling may refer to a layer 3 (network layer) protocol between a user equipment and a base station. The RRC signaling includes a connection setup function and a release function for configuring a user and a control plane according to a network state. Furthermore, the channel may be used for initial access to the network when the UE switches from a Radio Resource Control (RRC) connected idle mode to an active mode, or when switching in an RRC connected mode. The channel may be used for Downlink (DL) and/or Uplink (UL) data arrival when the UE is in RRC idle or RRC inactive mode, and when reestablishing a connection with the network.

According to an embodiment, the processor 330 may also include an interference cancellation circuit 333. The interference cancellation circuit 333 may identify an AoD value that is not the first AoD value corresponding to the serving cell 110. The interference cancellation circuit 333 may estimate the remaining AoD values (i.e., in addition to the first AoD value) as a second AoD value corresponding to the CSI-RS received from the interfering cell 130. The processor 330 may set PMI candidates based on the first AoD value corresponding to the serving cell 110. For example, the processor 330 may generate PMI candidates such that PMIs corresponding to a second AoD value among the PMI candidates are excluded, wherein the second AoD value corresponds to the interfering cell 130. Thus, the UE 120 is prevented from selecting PMI of the interfering cell 130 in advance.

According to an embodiment, the processor 330 may also include a switch determination circuit 335. The handover decision circuit 335 may calculate a first channel capacity for the channel of the serving cell 110 based on the first AoD value for the serving cell 110. Further, the handover decision circuit 335 may calculate a second channel capacity for the channel of the interfering cell 130 based on the second AoD value for the interfering cell 130. Next, in response to detecting that the magnitude of the first channel capacity is less than the magnitude of the second channel capacity, the handover decision circuit 335 may send a handover request to the serving cell 110.

According to an embodiment, the memory 320 may include an AoD storage circuit 321.AoD storage 321 may store the AoD value of CSI-RS received by UE 120. For example, the memory 320 may tag the first AoD value of the serving cell 110 continuously monitored by the AoD monitoring circuit with the serving cell 110. Further, the memory 320 may tag remaining AoD values other than the first AoD value among the AoD values with the interfering cell 130, and may store the first AoD value and the remaining AoD value separately from each other.

According to an embodiment, the memory 320 may further include an antenna array information storage circuit 323. The antenna array information storage circuit 323 may store antenna array information of the serving cell 110 obtained through RRC signaling exchange with the serving cell 110. Further, the antenna array information storage circuit 323 may obtain the antenna array information of the interfering cell 130 from the serving cell 110 and store the antenna array information of the interfering cell 130. When the processor 330 performs correlation analysis on the channel estimation result, the antenna array information storage circuit 323 may provide the pre-stored antenna array information of the serving cell 110 to the processor 330. Further, when the processor 330 determines whether to perform a handover, the antenna array information storage circuit 323 may provide antenna array information of the interfering cell 130 and antenna array information of the serving cell 110.

Fig. 4A shows an example of a detailed configuration of the communication circuit 310 in fig. 3.

Referring to fig. 4A, the communication circuit 310 includes a coding and modulation unit 410, a digital beamforming unit 420, first through nth transmission paths 430-1 through 430-N, and an analog beamforming unit 440.

The encoding and modulation unit 410 performs channel encoding. In some cases, at least one of a Low Density Parity Check (LDPC) code, a convolutional code, and a polar code may be used for channel coding. The encoding and modulation unit 410 generates modulation symbols by performing constellation mapping (modulation symbol). Constellation mapping may refer to a representation of symbols modulated by a digital modulation scheme such as quadrature amplitude modulation or phase shift keying. The mapping provides the signal as a two-dimensional xy-plane scatter plot in the complex plane. The angle of the point is measured counterclockwise from the horizontal axis and represents the phase shift of the carrier from the reference phase. The distance of a point from the origin represents a measure of the amplitude or power of the signal.

The digital beamforming unit 420 performs beamforming on digital signals (e.g., modulation symbols). Digital beamforming unit 420 multiplies the modulation symbols by beamforming weights. Here, the beamforming weights are used to change the amplitude and phase of the signal, and may be referred to as a "precoding matrix", "precoder", or the like. The digital beam forming unit 420 outputs the digital beam formed modulation symbols to the first through nth transmission paths 430-1 through 430-N, respectively. The modulation symbols may be multiplexed according to the MIMO transmission scheme, or the same modulation symbols may be provided to the first through nth transmission paths 430-1 through 430-N, respectively.

The first through nth transmission paths 430-1 through 430-N convert the digital beamformed digital signals into analog signals, respectively. Accordingly, each of the first through nth transmission paths 430-1 through 430-N may include an Inverse Fast Fourier Transform (IFFT) operation unit, a Cyclic Prefix (CP) insertion unit, a DAC, and an up-converter. The CP inserting unit is used for the OFDM scheme, and may be omitted when another physical layer scheme (e.g., a filter bank multi-carrier (FBMC) scheme) is applied. That is, the first through nth transmission paths 430-1 through 430-N, respectively, provide independent signal processing procedures for a large number of streams generated through digital beamforming. However, depending on the implementation, some components of the first through nth transmission paths 430-1 through 430-N may be used.

The analog beamforming unit 440 performs beamforming on the analog signal. The analog beamforming unit 440 multiplies the analog signal by beamforming weights. Thus, the beamforming weights are used to change the amplitude and phase of the signal.

Fig. 4B illustrates an example of a detailed configuration of the communication circuit 310 in fig. 3.

As shown in fig. 4B, the communication circuit 310 may include a decoding and demodulation unit 450, a digital beamforming unit 460, first through nth reception paths 470-1 through 470-N, and an analog beamforming unit 480.

The decoding and demodulation unit 450 may perform channel decoding. At least one of the LDPC code, the convolutional code, and the polar code may be used for channel decoding.

According to some embodiments, the digital beamforming unit 460 and the analog beamforming unit 480 may correspond to the digital beamforming unit 420 and the analog beamforming unit 440, respectively, as described with reference to fig. 4A. Accordingly, a detailed description of the digital beamforming unit 460 and the analog beamforming unit 480 is omitted herein for brevity.

The first through nth reception paths 470-1 through 470-N respectively convert analog signals subjected to analog beamforming into digital signals. To this end, each of the first through nth reception paths 470-1 through 470-N may include a Fast Fourier Transform (FFT) operation unit, an ADC, a CP removal unit, a serial-to-parallel converter, and a down converter. Each of the first through nth receive paths 470-1 through 470-N may down-convert the received signal to a baseband frequency, generate a serial time-domain baseband signal through CP removal, convert the serial time-domain baseband signal to a parallel time-domain baseband signal, generate N parallel frequency-domain signals through performing an FFT algorithm, and convert the N parallel frequency-domain signals to a sequence of modulated data symbols. The first through nth receive paths 470-1 through 470-N may each provide independent signal processing procedures for a large number of streams generated through analog beamforming. However, depending on the implementation, some components of the first through nth receive paths 470-1 through 470-N may be used.

Fig. 5 is a flow chart illustrating a method of operating UE 120 in accordance with some embodiments.

Referring to fig. 5, in operation S510, the UE 120 may receive CSI-RS and perform channel estimation on the received CSI-RS. As described with reference to fig. 1, the serving cell 110 may transmit a first CSI-RS and the interfering cell 130 may transmit a second CSI-RS. The first CSI-RS and the second CSI-RS may be transmitted based on the same time and frequency resources. Thus, UE 120 may not identify the second CSI-RS as an interfering signal. The CSI-RS received in operation S510 may include a first CSI-RS and a second CSI-RS transmitted by the serving cell 110 and the interfering cell 130, respectively. Next, UE 120 may perform channel estimation on the CSI-RS.

According to an embodiment of the present disclosure, the UE 120 may pre-store the AoD value of the serving cell 110 at a point of time when the CSI-RS of operation S510 is received. For example, in operation S510, the second CSI-RS of the interfering cell 130 may be received at a point of time when the UE 120 has moved to an edge region of the coverage of the serving cell 110. Accordingly, before the UE 120 moves to an edge region of the coverage of the serving cell 110, the UE 120 may receive CSI-RS from the serving cell 110, obtain AoD information of the serving cell 110, and store the extracted AoD value in a memory. In operation S510, it is assumed that the estimated channel may be represented by equation 1 in the nth period at the time point of receiving the CSI-RS from each of the serving cell 110 and the interfering cell 130.

[ equation 1]

In equation 1, H _g，n (θ) is equal to AoDθAn associated channel gain matrix.

In addition, ao D extracted from CSI-RS received from the serving cell 110 during the N-1 th period may be provided as in equation 2.

[ equation 2]

In operation S520, the UE 120 may classify the AoD values of the interfering cell 130 and the serving cell 110 by using the AoD information of the serving cell 110. For example, the AoD extracted for the nth CSI-RS may be represented using equation 3.

[ equation 3]

UE 120 may identify the added AoD value in the nth period based on equations 2 and 3 and classify the added AoD value based on equation 4.

[ equation 4]

For example, UE 120 may identify that the added AoD value for CSI-RS received in the nth period is not based on the first CSI-RS of serving cell 110 that has been continuously monitored. In some examples, UE 120 may identify that the added AoD value for the CSI-RS is based on a second CSI-RS of interfering cell 130 received in an edge region of coverage.

In operation S530, the UE 120 may remove an AoD component of the interfering cell 130 from the channel estimation result. The channel estimation result may be separated according to equation 5 to remove interference effects due to AoD of the interfering cell 130.

[ equation 5]

In the equation 5 of the present invention,is the array response vector for the serving cell 110 associated with AoDθ, +.>Is the array response vector of the interfering cell 130 associated with aodθ. In addition, equation 5 may be based on the case where UE 120 may generate an array response vector of interfering cell 130 by receiving antenna array information of interfering cell 130 from serving cell 110. When UE 120 does not receive antenna array information of interfering cell 130, the channel estimation result may be separated according to equations 6 and 7.

[ equation 6]

[ equation 7]

Since UE 120 stores antenna array information of serving cell 110, an effective channel of serving cell 110 may be obtained by generating an array response vector of serving cell 110 and performing channel estimation on AoD of serving cell 110 according to equation 6. In addition, according to equation 7, the effective interference channel of the interfering cell 130 may be obtained by subtracting the effective channel of the serving cell 110 obtained through equation 6 from the channel estimation result calculated in operation S510.

In operation S540, the UE 120 may determine RI and CQI for CSI feedback information based on an effective channel, and may select PMI based on a plurality of PMI candidates from which the AoD component of the interfering cell 130 is excluded. UE 120 may determine RI and CQI suitable for the estimated effective channel based on the first CSI-RS received from serving cell 110. In addition, the UE 120 may select a PMI suitable for the effective channel according to equation 8.

[ equation 8]

In equation 8, P may refer to an alternative PMI candidate. That is, the UE 120 may use PMI vectors other than those in the AoD direction as the interfering cell 130The remaining PMI vectors other than these are set as candidates.

In accordance with an embodiment of the present disclosure, in operation S550, the UE 120 may transmit a CSI report including at least the RI, CQI, and PMI determined with reference to operation S540. UE 120 may send a CSI report to serving cell 110.

Fig. 6 illustrates a graph in which the result of CSI-RS channel estimation is converted to the spatial domain, according to some embodiments.

Referring to fig. 6, the ue 120 may perform CSI-RS based channel estimation throughout the first to third periods. Each of the first period and the second period may correspond to a period in which the CSI-RS is not received from the interfering cell 130. The third period may be a period in which the UE 120 has moved sufficiently to an edge region of the coverage of the serving cell 110 to receive the second CSI-RS from the interfering cell 130.

Referring to the first period, at a first AoD value θ ₁ The received power measured at the second AoD value θ is higher than the received power measured at the second AoD value θ ₂ And a third AoD value θ ₃ At the measured received power. That is, at the second and third AoD values (θ ₂ And theta ₃ ) The measured received power is lower than the first AoD value theta ₁ At the measured received power. Referring to the second period, when the received power is at the first AoD value θ ₁ To a third AoD value of θ ₃ When measured as equal, the first AoD value theta of the first period ₁ To a third AoD value of θ ₃ A first AoD value θ in a second period of time ₁ To a third AoD value of θ ₃ Received power measured at each of (a)The size has been reduced. That is, UE 120 is moving from the center region to the edge region of coverage of serving cell 110.

With further reference to the third period, the received power is at the first AoD value θ ₁ Is measured as low (i.e., lower than the first AoD value θ in the first period and the second period ₁ Received power at) and at a second AoD value θ ₂ And a third AoD value θ ₃ Where is not received. Further, at a fourth AoD value θ ₄ Where the received power is measured. UE 120 may identify a fourth AoD value θ ₄ Is an AoD value in the direction of the interfering cell 130 because of the fourth AoD value θ ₄ Is the first AoD value θ that has been obtained for the serving cell 110 ₁ To a third AoD value of θ ₃ Different AoD values.

Fig. 7 is a flow chart illustrating a method of extracting AoD values according to some embodiments.

Referring to fig. 7, in operation S710, the UE 120 may obtain antenna array information of the serving cell 110. The antenna array information may include information about a panel structure, the number of operation panels, etc. of the serving cell 110. For example, in response to completing the RRC connection to serving cell 110, UE 120 may obtain antenna array information for serving cell 110.

According to an embodiment, UE 120 may also receive antenna array information of interfering cell 130 from serving cell 110 through RRC signaling based on table 1.

TABLE 1

/>

Each of the "codebook configffortterfacecell" and "codebookConfigForI nterferenceCell-r16" in table 1 may be in table 2.

TABLE 2

/>

In operation S720, the UE 120 may generate an array response vector based on the antenna array information of the serving cell 110. UE 120 may generate an array response vector for the corresponding AoD value in advance.

In operation S730, the UE 120 may perform correlation analysis on the plurality of array response vectors generated for the respective AoD values and the channel estimation result obtained in operation S510 (as described with reference to fig. 5). UE 120 may repeatedly determine a correlation between the channel estimation result and each of the plurality of array response vectors by performing a correlation analysis.

In operation S740, the UE 120 may obtain an AoD value for the CSI-RS by performing decomposition to the AoD domain. For example, as a result of repeatedly performing the correlation analysis on a plurality of AoD values, the UE 120 may recognize that the serving cell 110 is located in a direction indicated by the AoD value having a high correlation. As described with reference to fig. 6, the received CSI-RS has been domain converted into an AoD value on the X-axis according to the magnitude of the received power on the Y-axis. According to the present invention, UE 120 may be further based on PMI base space. The PMI base configures a PMI codebook. UE 120 may receive codebook information from a serving cell through Radio Resource Control (RRC) signaling. UE 120 may generate a base included in a Precoding Matrix Indicator (PMI) codebook based on the codebook information. UE 120 may perform a correlation analysis between the result of the channel estimation for the received CSI-RS and the generated base, and may determine the base having the highest correlation as the PMI base for the serving cell based on the correlation analysis.

Accordingly, a wireless communication system is provided that receives a first CSI-RS from a serving cell and a second CSI-RS from an interfering cell. The processor calculates a first AoD value based on the first CSI-RS and calculates a second AoD value based on the second CSI-RS. The processor determines that the second AoD value corresponds to an interfering cell. In addition, the processor communicates with the serving cell based on the first AoD value and a determination that the second AoD value corresponds to the interfering cell.

Fig. 8 is a flow chart illustrating a method of determining whether to perform a handoff in accordance with some embodiments.

Referring to fig. 8, in operation S810, a first AoD value of the serving cell 110 and a second AoD value of the interfering cell 130 may be classified. For example, UE 120 may store the AoD value monitored for serving cell 110 in memory. UE 120 may be obtained from the current CSI-RS forWherein +.about.of AoD values other than pre-stored are determined>As a second AoD value of the interfering cell.

In operation S820, the UE 120 may calculate a first channel capacity of an effective channel according to the first AoD value. The first channel capacity may be calculated according to equation 9.

[ equation 9]

/>

In equation 9, p _serv Is a PMI vector for a first AoD value corresponding to the serving cell 110, I is an identity matrix, snr is a signal to noise ratio, and H _serv [n]May refer to an effective channel between UE 120 and serving cell 110.

In operation S830, the UE 120 may calculate a second channel capacity of the interference channel according to the second AoD value. The second channel capacity may be calculated according to equation 10.

[ equation 10]

In equation 10, p _itf Is a PMI vector for a second AoD value corresponding to the serving cell 110, I is an identity matrix, snr is a signal to noise ratio, and H _itf [n]May refer to an interfering channel between UE 120 and interfering cell 130.

In operation S840, in response to detecting that the second channel capacity is greater in size than the first channel capacity, the UE 120 may request handover from the serving cell 110. For example, when the second channel capacity is greater than the first channel capacity, although UE 120 maintains the RRC connection to serving cell 110, UE 120 may be closer to interfering cell 130 and may have a better channel state with respect to interfering cell 130. Thus, UE 120 may request serving cell 110 to perform a handover to interfering cell 130.

A method of operating a wireless communication device comprising: receiving a first channel state information reference signal (CSI-RS) from a serving cell and a second CSI-RS from an interfering cell; calculating a first departure angle (AoD) value based on the first CSI-RS and calculating a second AoD value based on the second CSI-RS; determining that the second AoD value corresponds to an interfering cell; and communicate with the serving cell based on the first AoD value and the determination that the second AoD value corresponds to the interfering cell.

According to an aspect of the disclosure, the method further comprises: an angle of departure (AoD) value is calculated based on the estimated channel and antenna array information.

According to an aspect of the disclosure, the method further comprises: the AoD values are classified into a first AoD value corresponding to a serving cell and a second AoD value corresponding to an interfering cell adjacent to the serving cell.

According to an aspect of the disclosure, the CSI-RS based channel estimation is performed based on a first period to a third period, wherein the first period and the second period correspond to no CSI-RS being received from an interfering cell, and the third period corresponds to a second CSI-RS being received from an interfering cell.

According to an aspect of the disclosure, the method further comprises: the received power is measured at a first AoD value, a second AoD value, and a third AoD value in the first period and the second period.

According to an aspect of the disclosure, the method further comprises: the received power is measured at a fourth AoD value during the third period.

Referring to fig. 9, the wireless communication device 1000 may include a modem (not shown) and a Radio Frequency Integrated Circuit (RFIC) 1060. The modem may include an Application Specific Integrated Circuit (ASIC) 1010, a special instruction set processor (ASIP) 1030, memory 1050, a main processor 1070, and a main memory 1090. The description of the wireless communication apparatus 1000 of fig. 9 may correspond to the description of the UE 120 of fig. 1 and is omitted herein for brevity.

The RFIC 1060 may be connected to the antenna Ant, and thus receive signals from the outside of the wireless communication apparatus 1000 or transmit signals to the outside of the wireless communication apparatus 1000 by using a wireless communication network. ASIP 1030, which is an integrated circuit customized for a particular purpose, may support a specific instruction set for a particular application and execute instructions included in the instruction set. Memory 1050 may be in communication with ASIP and may store, as non-transitory storage, a plurality of instructions executed by ASIP. For example, memory 1050 may include any type of memory accessible by ASIP, such as Random Access Memory (RAM), read Only Memory (ROM), magnetic tape, magnetic disk, optical disk, volatile memory, non-volatile memory, and combinations thereof, as non-limiting examples.

The main processor 1070 can control the wireless communication device 1000 by executing a plurality of instructions. For example, the main processor 1070 may control the ASIC 1010 and ASIP 1030 and may process data received through a wireless communication network or process input from a user to the wireless communication device 1000. For example, the primary processor 1070 may track an AoD value of a serving cell and, in response to the received AoD value of the CSI-RS including an AoD value different from the tracked AoD value, may determine RI, CQI, and PMI by calculating an effective channel while excluding the different AoD value.

The main memory 1090 may be in communication with the main processor 1070 and may store a plurality of instructions for execution by the main processor as a non-transitory storage device. For example, the main memory 1090 may include any type of memory accessible by the main processor 1070, such as RAM, RO M, magnetic tape, magnetic disk, optical disk, volatile memory, non-volatile memory, and combinations thereof, as non-limiting examples.

While the present inventive concept has been particularly shown and described with reference to embodiments thereof, it will be understood that various changes in form and details may be made therein without departing from the spirit and scope of the appended claims.

The processes discussed above are intended to be illustrative and not limiting. Those of skill in the art will appreciate that the steps of the processes discussed herein may be omitted, modified, combined, and/or rearranged, and that any additional steps may be performed without departing from the scope of the invention. More generally, the above disclosure is intended to be illustrative and not limiting. Only the appended claims are intended to set forth the metes and bounds of the invention. Furthermore, it is to be noted that features and limitations described in any one embodiment may be applied to any other embodiment herein, and that flowcharts or examples relating to one embodiment may be combined with any other embodiment in a suitable manner, done in a different order, or done in parallel. Furthermore, the systems and methods described herein may be performed in real time. It should also be noted that the above-described systems and/or methods may be applied to or used in accordance with other systems and/or methods.

Claims

1. A wireless communications apparatus, comprising:

a communication circuit configured to receive a channel state information reference signal CSI-RS;

a processor comprising an exit angle AoD monitoring circuit and an interference cancellation circuit, wherein:

the AoD monitoring circuit is configured to extract an AoD value corresponding to the received CSI-RS, and

the interference cancellation circuit is configured to cancel a second one of the AoD values corresponding to an interfering cell adjacent to the serving cell in addition to the first one corresponding to the serving cell; and

and a memory storing a first AoD value corresponding to the serving cell and antenna array information of the serving cell.

2. The wireless communication device of claim 1, wherein,

the antenna array information of the serving cell is obtained based on at least one of radio resource control RRC signaling, medium access control MAC control element CE, and downlink control information DCI.

3. The wireless communication device of claim 1, wherein,

the processor is configured to:

estimating an effective channel based on a first AoD value corresponding to a serving cell; and

a rank indicator RI and a channel quality indicator CQI are determined based on the estimated effective channel.

4. The wireless communication device of claim 1, wherein,

The processor is configured to:

generating precoding matrix indicator, PMI, candidates based on remaining AoD values other than a second AoD value corresponding to an interfering cell among the AoD values corresponding to the CSI-RS; and

one PMI is selected based on the generated PMI candidates.

5. The wireless communication device of claim 1, wherein,

the processor further includes a switch determination circuit configured to:

calculating a first channel capacity of the effective channel, wherein the first channel capacity of the effective channel is estimated based on a first AoD value corresponding to the serving cell;

calculating a second channel capacity of the interfering channel, wherein the second channel capacity of the interfering channel is estimated based on a second AoD value corresponding to the interfering cell; and

and transmitting a handover request to the serving cell in response to the second channel capacity being greater than the first channel capacity.

6. The wireless communication device of claim 1, wherein,

the processor is configured to:

generating a plurality of array response vectors respectively corresponding to the plurality of AoD values based on antenna array information of the serving cell;

performing a correlation analysis between a result of channel estimation for the received CSI-RS and the plurality of array response vectors;

Determining an AoD value having a highest correlation based on the correlation analysis; and

and selecting the AoD value with the highest correlation degree as the AoD value of the service cell.

7. The wireless communication device of claim 1, wherein,

the processor is configured to:

receiving codebook information from a serving cell through radio resource control, RRC, signaling;

generating a base included in a Precoding Matrix Indicator (PMI) codebook based on the codebook information;

performing a correlation analysis between a result of channel estimation for the received CSI-RS and the generated base; and

and determining a base with the highest correlation degree as a PMI base of the serving cell based on the correlation analysis.

8. A method of operating a wireless communication device, the method comprising:

receiving a channel state information reference signal (CSI-RS);

extracting an AoD value of an departure angle corresponding to the received CSI-RS; and

the AoD values are classified into a first AoD value corresponding to a serving cell and a second AoD value corresponding to an interfering cell adjacent to the serving cell.

9. The method of claim 8, further comprising:

receiving antenna array information of a serving cell from the serving cell,

wherein the antenna array information of the serving cell is obtained based on at least one of radio resource control, RRC, signaling, medium access control, MAC, control element, CE, and downlink control information, DCI.

10. The method of claim 8, further comprising:

estimating an effective channel based on a first AoD value corresponding to a serving cell;

determining a rank indicator RI and a channel quality indicator CQI based on the estimated effective channel; and

and sending a CSI report comprising the RI and the CQI to a serving cell.

11. The method of claim 8, further comprising:

generating precoding matrix indicator, PMI, candidates based on remaining AoD values other than a second AoD value among the AoD values corresponding to the CSI-RS;

selecting one PMI based on the generated PMI candidate; and

and transmitting a CSI report including the selected PMI to the serving cell.

12. The method of claim 8, further comprising:

calculating a first channel capacity of the effective channel, wherein the first channel capacity is estimated based on a first AoD value corresponding to the serving cell;

calculating a second channel capacity of the interfering channel, wherein the second channel capacity is estimated based on a second AoD value corresponding to the interfering cell; and

13. The method of claim 8, wherein,

the step of extracting the AoD value corresponding to the received CSI-RS includes:

14. The method of claim 8, further comprising:

generating a base of a Precoding Matrix Indicator (PMI) codebook based on the codebook information;

the base with the highest correlation is determined as the PMI base of the serving cell based on the correlation analysis.

15. A wireless communication system, comprising:

a serving cell configured to transmit a first channel state information reference signal CSI-RS and antenna array information;

an interfering cell configured to transmit a second CSI-RS; and

a wireless communication apparatus configured to receive a first CSI-RS and a second CSI-RS, wherein the wireless communication apparatus comprises:

Communication circuitry configured to receive a CSI-RS comprising a first CSI-RS and a second CSI-RS;

a processor configured to extract an AoD value corresponding to the received CSI-RS and classify the AoD value into a first AoD value corresponding to a serving cell and a second AoD value corresponding to an interfering cell; and

16. The wireless communication system of claim 15, wherein,

the wireless communication device is further configured to:

17. The wireless communication system of claim 15, wherein,

the wireless communication device is further configured to:

one PMI is selected based on the generated PMI candidates.

18. The wireless communication system of claim 15, wherein,

the wireless communication device is further configured to:

19. The wireless communication system of claim 17, wherein,

the processor is further configured to:

performing a correlation analysis between a result of channel estimation for the received CSI-RS and the plurality of array response vectors; and

and determining the AoD value with the highest correlation degree as the AoD value of the serving cell based on the correlation analysis.

20. The wireless communication system of claim 15, wherein,

the antenna array information is transmitted to the wireless communication device based on at least one of radio resource control, RRC, signaling, medium access control, MAC, control element, CE, and downlink control information, DCI.