KR20230078476A - wireless communication apparatus for receiving data from multiple transmission and reception point and method of operation thereof - Google Patents

Abstract

According to the present invention, a wireless communication device for supporting communication with multiple transmission and reception points (TRPs) comprises: a radio frequency integrated circuit (RFIC) receiving a first reference signal from a first TRP and receiving a second reference signal from a second TRP; and a processor estimating channels of a plurality of subcarriers based on one or more of the first reference signal and the second reference signal. The processor is able to determine a beam forming parameter, in which the capacity of an effective channel between the first TRP and the second TRP and the wireless communication device has the maximum value, by using the estimated channels, and adjust a reception beam based on the determined beam forming parameter. The RFIC is able to receive a first physical downlink shared channel (PDSCH) from the first TRP through the adjusted reception beam, and receive a second PDSCH from the second TRP. Therefore, data can be efficiently received in wireless communication with multiple TRPs.

Description

Wireless communication apparatus for receiving data from multiple transmission and reception points and method of operation thereof

The technical idea of the present disclosure is an invention related to a wireless communication device that receives a physical downlink shared channel (PDSCH) from a plurality of transmission and reception points (TRPs).

Recent communication systems consider multiple-transmission and reception point (M-TRP) as one of the methods for obtaining spatial diversity between a base station and a terminal. Each of the multiple TRPs may transmit data and reference signals to the terminal, and a channel between each TRP and the terminal may be different from each other. The terminal may receive data and reference signals from multiple TRPs. Accordingly, there is a demand for a method in which a UE can more efficiently receive a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) using reference signals received from multiple TRPs.

An object to be solved by the technical spirit of the present disclosure is to provide a wireless communication apparatus and method of operating the same for receiving a physical downlink shared channel (PDSCH) from multiple transmission and reception points.

In order to achieve the above object, in a wireless communication device supporting communication with multiple transmission and reception points (TRPs) according to the technical idea of the present disclosure, a first reference signal is received from a first TRP. and a radio frequency integrated circuit (RFIC) receiving a second reference signal from a second TRP and a processor estimating channels of a plurality of subcarriers based on at least one of the first reference signal and the second reference signal. . The processor determines a beamforming parameter having a maximum capacity of an effective channel between the first and second TRPs and the wireless communication device using the estimated channels, and determines a reception beam based on the determined beamforming parameter. can be adjusted. The RFIC may receive a first physical downlink shared channel (PDSCH) from the first TRP and receive a second PDSCH from the second TRP through the adjusted Rx beam.

In the operating method of a wireless communication device receiving data from a first transmission and reception point (TRP) and a second TRP according to another aspect of the technical idea of the present disclosure, a first reference signal is received from the first TRP. and receiving a second reference signal from a second TRP, estimating channels of a plurality of subcarriers based on at least one of the first reference signal and the second reference signal, and using the estimated channels determining a beamforming parameter having a maximum capacity of an effective channel between the first and second TRPs and the wireless communication device, adjusting a reception beam based on the determined beamforming parameter, and adjusting the adjusted and receiving a first physical downlink shared channel (PDSCH) from the first TRP through a reception beam and receiving a second PDSCH from the second TRP.

In a wireless communication system according to another aspect of the technical idea of the present disclosure, a first transmission and reception point (TRP), a second TRP, and a wireless communication device are included. The first and second TRPs transmit first and second reference signals, respectively, to the wireless communication device, and the wireless communication device transmits first and second reference signals, respectively, from the first and second TRPs. signal can be received. The wireless communication device estimates channels of a plurality of subcarriers based on at least one of the first reference signal and the second reference signal, and communicates with the first and second TRPs using the estimated channels. A beamforming parameter having a maximum capacity of an effective channel between devices is determined, a reception beam is adjusted based on the determined beamforming parameter, and a first PDSCH (physical downlink shared channel) and receive a second PDSCH from the second TRP.

A wireless communication apparatus according to an exemplary embodiment of the present disclosure performs a reception beamforming operation in consideration of channels formed with multiple transmission and reception points (TRPs), thereby performing wireless communication with multiple TRPs. data can be received efficiently.

Effects obtainable in the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned are common knowledge in the art to which exemplary embodiments of the present disclosure belong from the following description. can be clearly derived and understood by those who have That is, unintended effects according to the implementation of the exemplary embodiments of the present disclosure may also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

1A and 1B illustrate a wireless communication system according to an exemplary embodiment of the present disclosure.
2 illustrates channel characteristics according to quasi-co-location (QCL) types.
3A and 3B illustrate transmission of a reference signal based on a single frame network (SFN) according to an exemplary embodiment of the present disclosure.
4a and 4b illustrate transmission of a reference signal based on a non-single frame network (SFN) according to an exemplary embodiment of the present disclosure.
5A to 5C illustrate PDSCH transmission of multiple TRPs according to exemplary embodiments of the present disclosure.
6 illustrates a method of operating a wireless communication device according to exemplary embodiments of the present disclosure.
7 illustrates an operating method of a wireless communication device according to exemplary embodiments of the present disclosure.
8 illustrates an operating method of a wireless communication device according to exemplary embodiments of the present disclosure.
9 illustrates a wireless communication device according to exemplary embodiments of the present disclosure.
10 is a block diagram illustrating an electronic device according to an exemplary embodiment of the present disclosure.

A base station communicates with a wireless communication device and is an entity that allocates communication network resources to the wireless communication device, and is a cell, a base station (BS), a NodeB (NB), an eNodB (eNB), and a next generation radio (NG RAN) access network), a radio access unit, a base station controller, a node on a network, a gNodeB (gNB), a transmission and reception point, a transmission point, and a remote radio head (RRH).

A wireless communication device is a subject that communicates with a base station or another wireless communication device, and includes a node, a user equipment (UE), a next generation UE (NG UE), a mobile station (MS), a mobile equipment (ME), It may be referred to as a device or a terminal.

In addition, wireless communication devices include smart phones, tablet PCs, mobile phones, video phones, e-book readers, desktop PCs, laptop PCs, netbook computers, PDAs, portable multimedia players (PMPs), MP3 players, medical devices, cameras, or wearables. It may include at least one of the devices. In addition, wireless communication devices include televisions, DVD (digital video disk) players, audio systems, refrigerators, air conditioners, vacuum cleaners, ovens, microwave ovens, washing machines, air purifiers, set-top boxes, home automation control panels, security control panels, and media boxes. (eg, Samsung HomeSyncTM, Apple TVTM, or Google TVTM), a game console (eg, XboxTM, PlayStationTM), an electronic dictionary, an electronic key, a camcorder, or an electronic picture frame. In addition, wireless communication devices are various medical devices (e.g., various portable medical measuring devices (glucose meter, heart rate monitor, blood pressure monitor, or body temperature monitor), magnetic resonance angiography (MRA), magnetic resonance imaging (MRI), computed CT (CT) tomography), camera, or sonar), navigation devices, global navigation satellite systems (GNSS), event data recorders (EDRs), flight data recorders (FDRs), automotive infotainment devices, marine electronic equipment (e.g. navigation systems for ships, gyrocompasses, etc.), avionics, security devices, head units for vehicles, industrial or home robots, drones, ATMs in financial institutions, point of sales (POS) in stores , or at least one of IoT devices (eg, light bulbs, various sensors, sprinkler devices, fire alarms, thermostats, street lights, toasters, exercise equipment, hot water tanks, heaters, boilers, etc.). In addition, the wireless communication device may include various types of multi-media systems capable of performing communication functions.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B illustrate a wireless communication system according to an exemplary embodiment of the present disclosure.

Specifically, FIG. 1A illustrates an example in which base stations transmit a physical downlink shared channel (PDSCH) to a wireless communication device based on single downlink control information (S-DCI). 1b illustrates an example in which base stations transmit a PDSCH to a wireless communication device based on multi-DCI (M-DCI).

Referring to FIGS. 1A and 1B , a wireless communication system may include a wireless communication device 10 and base stations 20a and 20b. In the present disclosure, a base station, a transmission and reception point (TRP), and a remote radio head (RRH) may be used interchangeably. For convenience of description, the wireless communication system is shown as including only two TRPs 20a and 20b, but this is only an exemplary embodiment, and is not limited thereto, and the wireless communication system may be implemented to include various numbers of base stations. can

The TRPs 20a and 20b may be connected to the wireless communication device 10 through a wireless channel to provide various communication services. The TRPs 20a and 20b may provide service through a shared channel for all user traffic, and provide status information such as the buffer status, available transmit power status, and channel status of the wireless communication device 10. can be aggregated and scheduled. A wireless communication system may support a beamforming technology using orthogonal frequency division multiplexing (OFDM) as a radio access technology. In addition, the wireless communication system may support an Adaptive Modulation & Coding (AMC) method for determining a modulation scheme and a channel coding rate according to the channel condition of the wireless communication device 10. there is.

In addition, the wireless communication system may transmit and receive signals using a wide frequency band existing in a frequency band of 6 GHz or higher. For example, in a wireless communication system, a data transmission rate may be increased by using a millimeter wave band such as a 28 GHz band or a 60 GHz band. At this time, since the millimeter wave band has a relatively large signal attenuation per distance, the wireless communication system can support transmission and reception based on a directional beam generated using multiple antennas to secure coverage. The wireless communication system may be a system supporting multiple input, multiple output (MIMO), and thus the TRPs 20a and 20b and the wireless communication device 10 may support beamforming technology. Beamforming technology can be divided into digital beamforming, analog beamforming, hybrid beamforming, etc. Hereinafter, the wireless communication system will describe the concept of the present technology centering on an embodiment supporting the hybrid beamforming technology, but the present technology It will be fully understood that it can be applied to other beamforming techniques as well.

Referring back to FIG. 1A , the first TRP 20a and the second TRP 20b may transmit different physical downlink shared channels (PDSCHs) to the wireless communication device 10 . Specifically, the first TRP 20a may transmit PDSCH1 to the wireless communication device 10, and the first TRP 20b may transmit PDSCH2 to the wireless communication device 10. That is, the second TRP 20a and the second TRP 20b may transmit different PDSCHs to the wireless communication device 10. The first TRP 20a may transmit downlink control information (DCI) to the wireless communication device 10 through a physical downlink control channel (PDCCH). PDSCH1 and PDSCH2 may be scheduled by the PDCCH transmitted by the first TRP 20a. That is, control signals for PDSCH1 and PDSCH2 may be transmitted by one first TRP 20a.

Referring to FIG. 1B, the first TRP 20a and the second TRP 20b may transmit different PDSCHs. For example, the base station 20a may transmit PDSCH1 and PDCCH1 for scheduling the PDSCH1 to the wireless communication device 10 . The second TRP 20b may transmit PDSCH2 and PDCCH2 for scheduling the PDSCH2 to the wireless communication device 10 . In the present disclosure, a situation in which multiple TRPs and a wireless communication device transmit and receive signals to each other may be referred to as Multi-TRP (M-TRP).

The present disclosure proposes a method for a wireless communication device to receive PDSCH1 transmitted from a first TRP 20a and PDSCH2 transmitted from a second TRP 20b in at least one of S-DCI and M-DCI. Specifically, the present disclosure proposes a method for a wireless communication device to design a hybrid beamformer based on reference signals connected to PDSCH1 and PDSCH2 in QCL-type-D, respectively.

2 illustrates channel characteristics according to quasi-co-location (QCL) types.

Referring to FIG. 2, channel characteristics of QCL-Type-A include Doppler shift, Doppler spread, average delay, and delay spread. Channel characteristics of QCL-Type-B include Doppler shift and Doppler spread. Channel characteristics of QCL-Type-C include Doppler shift and average delay. Channel characteristics of QCL-Type-D include Spatial Rx parameter. QCL-Type-D may mean that a wireless communication device shares a Spatial Rx parameter obtained from a source signal with a target signal. A source signal may be referred to as a source channel. A target signal may be referred to as a target channel.

The wireless communication device may design a hybrid beamforming matrix using a channel estimated from a reference signal having a QCL-Type-D relationship with a physical downlink control channel (PDCCH)/physical downlink shared channel (PDSCH). That is, in a QCL-Type-D situation, a wireless communication device can design a hybrid beamforming matrix using a channel estimated from a reference signal set as a source signal for PDCCH/PDSCH. Multiple TRPs may transmit PDCCH/PDSCH and QCL-Type-D reference signals to the wireless communication device.

Hereinafter, a transmission configuration indication (TCI) will be described. The base station may inform the terminal that a physical downlink shared channel (PDSCH) and a physical downlink control channel (PDCCH) are transmitted using the same beam as the reference signal to the terminal by signaling a TCI state. That is, the base station may inform that the PDSCH and the PDCCH are transmitted based on the same spatial filter as a specific reference signal. The TCI state may include information about a reference signal. For example, the TCI state may include information on at least one of a synchronization signal block (SSB) and a channel state information-reference signal (CSI-RS). The base station may inform the terminal which TCI the PDSCH and PDCCH are associated with through TCI status signaling. Hereinafter, examples in which the TRP transmits a reference signal will be described.

3A and 3B illustrate transmission of a reference signal based on a single frame network (SFN) according to an exemplary embodiment of the present disclosure.

SFN means that time and frequency resources of reference signals transmitted by different TRPs overlap. Referring to FIG. 3A , the first TRP 20a and the second TRP 20b may each transmit a channel state information-reference signal (CSI-RS) to a wireless communication device. The CSI-RS transmitted by the first TRP 20a and the CSI-RS transmitted by the second TRP 20b overlap in time and frequency resources. Accordingly, the wireless communication device cannot distinguish from which TRP the received CSI-RS is transmitted. Referring to FIG. 3B, the first TRP 20a and the second TRP 20b may each transmit a synchronization signal block (SSB) to the wireless communication device. The SSB transmitted by the first TRP 20a and the SSB transmitted by the second TRP 20b overlap in time and frequency resources. Accordingly, the wireless communication device cannot distinguish from which TRP the received SSB is transmitted.

PDSCH1 and PDSCH2 are allocated in multiple TCI states, and the wireless communication device binds a reference signal with TCI 0 and QCL-type-D from the first TRP 20a and TCI 1 and QCL-type-D from the second TRP 20b When receiving the reference signals tied to , and the above-described respective reference signals are the same, the wireless communication device may determine that the SFN reference signals are received from the first TRP 20a and the second TRP 20b.

The wireless communication device may receive information related to whether the reference signal is transmitted through the SFN from at least one of the first TRP 20a and the second TRP 20b, and based on this, determine whether the reference signals are transmitted through the SFN. .

In the SFN situation, the reference signals received by the wireless communication device from the first TRP 20a and the second TRP 20b may be expressed as in Equation 1 below.

는 무선 통신 장치가 수신한 신호를 지칭할 수 있다.

는 제1 TRP 및 제2 TPR 중 적어도 하나가 송신한 기준 신호를 지칭할 수 있다.

는 잡음 신호를 지칭할 수 있다.

는 제1 TRP(20a)와 무선 통신 장치간 채널을 지칭할 수 있다.

는 제2 TRP(20b)와 무선 통신 장치간 채널을 지칭할 수 있다.

는 프리코딩 행렬을 지칭할 수 있다. In Equation 1,

may refer to a signal received by the wireless communication device.

may refer to a reference signal transmitted by at least one of the first TRP and the second TPR.

may refer to a noise signal.

May refer to a channel between the first TRP 20a and the wireless communication device.

May refer to a channel between the second TRP 20b and the wireless communication device.

may refer to a precoding matrix.

4a and 4b illustrate transmission of a reference signal based on a non-single frame network (SFN) according to an exemplary embodiment of the present disclosure.

Referring to FIG. 4A , the first TRP 20a and the second TRP 20b may each transmit a channel state information-reference signal (CSI-RS) to a wireless communication device. The CSI-RS transmitted by the first TRP 20a and the CSI-RS transmitted by the second TRP 20b are distinguished by at least one of time and frequency resources. Accordingly, the wireless communication device can distinguish from which TRP the received CSI-RS is transmitted. Referring to FIG. 4B, the first TRP 20a and the second TRP 20b may each transmit a synchronization signal block (SSB) to the wireless communication device. The SSB transmitted by the first TRP 20a and the SSB transmitted by the second TRP 20b are distinguished by at least one of time and frequency resources. Accordingly, the wireless communication device can distinguish from which TRP the received SSB is transmitted.

PDSCH1 and PDSCH2 are allocated in multiple TCI states, and the wireless communication device binds a reference signal with TCI 0 and QCL-type-D from the first TRP 20a and TCI 1 and QCL-type-D from the second TRP 20b When receiving a reference signal tied to , and the above-described respective reference signals are different, the wireless communication device may determine that non-SFN reference signals are received from the first TRP 20a and the second TRP 20b.

The wireless communication device receives information related to whether the reference signal is transmitted through the SFN from at least one of the first TRP 20a and the second TRP 20b, and determines whether the reference signals are transmitted through the non-SFN based on this information. can

In a non-SFN situation, the reference signal received by the wireless communication device from the first TRP and the second TRP may be expressed as in Equation 2 below.

는 무선 통신 장치가 제i TRP로부터 수신한 기준 신호를 지칭할 수 있다.

는 제i TPR가 송신한 기준 신호를 지칭할 수 있다.

는 잡음 신호를 지칭할 수 있다.

는 제i TRP와 무선 통신 장치간 채널을 지칭할 수 있다.

는 프리코딩 행렬을 지칭할 수 있다. In Equation 2,

may refer to a reference signal received by the wireless communication device from the i th TRP.

may refer to a reference signal transmitted by the i th TPR.

may refer to a noise signal.

May refer to a channel between the i th TRP and the wireless communication device.

may refer to a precoding matrix.

5A to 5C illustrate PDSCH transmission of multiple TRPs according to exemplary embodiments of the present disclosure.

Specifically, FIG. 5A illustrates an example in which a PDSCH is transmitted after being spatially division multiplexed (SDM) in the case of single-DCI (Single-DCI, S-DCI). (a) of FIG. 5B shows an example in which a PDSCH is transmitted by performing frequency division multiplexing (FDM) in the case of S-DCI. (b) of FIG. 5B shows an example in which a PDSCH is FDMed and transmitted in the case of multi-DCI (multi-DCI, M-DCI). (a) of FIG. 5C shows a case in which a time division multiplexing (TDM) PDSCH is transmitted in one slot. That is, (a) of FIG. 5C shows an example of intra-slot TDM. (b) of FIG. 5C shows a case in which TDM PDSCHs are transmitted in different slots. That is, (b) of FIG. 5C shows an example of inter-slot TDM. Hereinafter, each case will be described in detail.

Referring to FIG. 5A, a wireless communication device may receive an SDM PDSCH from each TRP. For example, the wireless communication device may receive a first layer from a first TRP 20a and receive a second layer from a second TRP 20b. The wireless communication device may simultaneously receive PDSCH1 and PDSCH2 from the first TRP 20a and the second TRP 20b, respectively.

Referring to S-DCI FDM of FIG. 5B, a wireless communication device may receive FDMed PDSCH based on S-DCI from each TRP. For example, the wireless communication device may receive PDSCH1 through a first resource block (RB) from a first TRP (20a), and receive PDSCH2 through a second resource block from a second TRP (20b) can do. The wireless communication device may simultaneously receive PDSCH1 and PDSCH2 from the first TRP 20a and the second TRP 20b, respectively.

Referring to the M-DCI FDM of FIG. 5B, the wireless communication device may receive the FDMed PDSCH based on the M-DCI from each TRP. For example, the wireless communication device may receive a first codeword (codeword, CW) from the first TRP 20a and may receive a second codeword from the second TPR 20b. The wireless communication device may simultaneously receive PDSCH1 and PDSCH2 from the first TRP 20a and the second TRP 20b, respectively.

Referring to Intra-slot TDM of FIG. 5C, a wireless communication device may receive a TDM PDSCH from each TRP in one slot. For example, the wireless communication device may receive PDSCH1 from the first TRP 20a and PDSCH2 from the second TRP 20b in one slot.

Referring to the inter-slot TDM of FIG. 5C, the wireless communication device may receive TDM PDSCH from each TRP in different slots. For example, the wireless communication device may receive PDSCH1 in slot n from the first TRP 20a and receive PDSCH2 in slot n+1 from the second TRP 20b.

In a multiple-TRP environment, a PDSCH signal received by a wireless communication device may be expressed as in Equation 3 below.

는 l 번째 OFDM(orhthogonal frequency division multiplexing) 심볼, k 번째 자원 요소(resource element, RE)에서, 각 RF(radio frequency) 체인(chain) 별로 수신된 신호를 벡터(vector)로 나타낸 것일 수 있다.

는 무선 통신 장치와 TRP 간의 PDSCH 채널을 지칭할 수 있다.

는 TRP가 송신하는 신호를 벡터로 나타낸 것일 수 있다.

는 무선 통신 장치의 하이브리드 빔포머를 지칭할 수 있다.

는 하이브리드 빔포머를 거친 잡음 벡터를 지칭할 수 있다. In Equation 3,

In the l-th orthogonal frequency division multiplexing (OFDM) symbol and the k-th resource element (RE), signals received for each radio frequency (RF) chain may be represented as vectors.

May refer to a PDSCH channel between the wireless communication device and the TRP.

may represent a signal transmitted by the TRP as a vector.

may refer to a hybrid beamformer of a wireless communication device.

may refer to a noise vector that has passed through the hybrid beamformer.

This disclosure proposes a hybrid beamforming design method and a metric for hybrid beamforming design. This disclosure describes channel capacity or spectral efficiency as an embodiment of a metric for hybrid beamforming design. The metric for hybrid beamforming design of the present disclosure is not limited to the above-described embodiment, and it is obvious that it can be extended to various metrics that can represent channel quality such as MMIB (mean mutual information per bit).

Given the hybrid beamforming matrix W, the capacity of the channel H[k] can be expressed as Equation 4 below.

는 하이브리드 빔포밍 행렬 W가 주어진 경우 채널 H[k]의 용량을 지칭할 수 있다.

는 아이덴티티 행렬을 지칭할 수 있다.

는 하이브리드 빔포밍 행렬의 허미션(Hermitian) 행렬을 지칭할 수 있다.

는 k번재 자원 요소에서의 채널을 지칭할 수 있다.In Equation 4,

may refer to the capacity of the channel H[k] given the hybrid beamforming matrix W.

may refer to an identity matrix.

may refer to a Hermitian matrix of a hybrid beamforming matrix.

May refer to a channel in the k-th resource element.

The hybrid beamforming matrix W may be expressed as in Equation 5 below.

In Equation 5, W may refer to a hybrid beamforming matrix. W _RF may refer to an analog matrix. W _BB- may indicate a baseband matrix.

Hereinafter, embodiments in which a wireless communication device receives a reference signal and a PDSCH from multiple TRPs will be described in detail.

1. A wireless communication device receives a PDSCH transmitted by time division multiplexing (TDM) based on S-DCI from one or more TRPs.

Hereinafter, the aforementioned first TRP 20a may correspond to TRP0, and the aforementioned second TRP 20b may correspond to TRP1. When the wireless communication device receives the TDM PDSCH from TRP0 and TRP1 based on S-DCI, the channel and transmission signal between the terminal and the TRP may be expressed as in Equation 6 below.

는 l 번째 심볼, k번째 자원 요소에서 무선 통신 장치와 TRP간 채널을 지칭할 수 있다.

는 TRP가 송신한 신호를 지칭할 수 있다.

는 무선 통신 장치와 TRP0간 채널을 지칭할 수 있다.

는 TRP0이 송신한 신호를 지칭할 수 있다.

는 무선 통신 장치와 TRP1간 채널을 지칭할 수 있다.

는 TRP1이 송신한 신호를 지칭할 수 있다.In Equation 6,

May refer to a channel between the wireless communication device and the TRP in the l th symbol and k th resource element.

may refer to a signal transmitted by the TRP.

May refer to a channel between the wireless communication device and TRP0.

may refer to a signal transmitted by TRP0.

may refer to a channel between the wireless communication device and the TRP1.

may refer to a signal transmitted by TRP1.

When the wireless communication device receives the reference signal transmitted based on the SFN, the channel between the wireless communication device and TRP0 and the channel between the wireless communication device and TRP1 cannot be separated and observed.

A hybrid in which the wireless communication device maximizes the capacity of a channel estimated from the reference signal when the wireless communication device receives the PDSCH TDMed from TRP0 and TRP1 based on S-DCI and receives a reference signal based on SFN. By designing the beamformer, both the PDSCH from TRP0 and the PDSCH from TRP1 can be received robustly. In other words, the hybrid beamformer may be designed to maximize the capacity of an effective channel generated by applying the beamforming matrix of the hybrid beamformer to the estimated channel. In this case, the hybrid beamforming matrix designed by the wireless communication device may be expressed as Equation 7 below.

는 k번째 자원 요소에서 기준 신호가 지나는 채널을 지칭할 수 있다. N_RS는 기준 신호의 자원 요소의 개수를 지칭할 수 있다.In Equation 7,

may indicate a channel through which the reference signal passes in the k-th resource element. N _RS may refer to the number of resource elements of the reference signal.

When the wireless communication device receives a reference signal transmitted through non-SFN, a channel between the wireless communication device and TRP0 and a channel between the wireless communication device and TRP1 can be separated and observed using the received reference signal.

When the wireless communication device receives the TDMed PDSCHs from TRP0 and TRP1 based on S-DCI and receives a reference signal based on non-SFN, the wireless communication device can maximize the capacity of the reference signal channel transmitted from TRP0. A hybrid beamforming matrix capable of maximizing capacity of a reference signal channel transmitted from TRP1 and a hybrid beamforming matrix capable of maximizing the capacity of a reference signal channel transmitted from TRP1 may be designed. Each hybrid beamforming matrix may be applied according to a transmission configuration information (TCI) state of a corresponding OFDM symbol. In this case, the hybrid beamforming matrix designed by the wireless communication device may be expressed as Equation 8 below.

는 TRP0가 전송하는 기준 신호가 지나는 채널의 자원 요소의 개수를 지칭할 수 있다.

는 TRP1이 전송하는 기준 신호가 지나는 채널의 자원 요소의 개수를 지칭할 수 있다.

는 TRP0가 전송하는 기준 신호의 시작 심볼을 지칭할 수 있다.

는 TRP0가 전송하는 기준 신호의 마지막 심볼을 지칭할 수 있다. .

는 TRP1이 전송하는 기준 신호의 시작 심볼을 지칭할 수 있다.

는 TRP1이 전송하는 기준 신호의 마지막 심볼을 지칭할 수 있다.In Equation 8,

may refer to the number of resource elements of a channel through which a reference signal transmitted by TRP0 passes.

may refer to the number of resource elements of a channel through which a reference signal transmitted by TRP1 passes.

may indicate a start symbol of a reference signal transmitted by TRP0.

may refer to the last symbol of the reference signal transmitted by TRP0. .

may indicate a start symbol of a reference signal transmitted by TRP1.

may refer to the last symbol of the reference signal transmitted by TRP1.

2. The wireless communication device receives a PDSCH transmitted by frequency division multiplexing (FDM) based on S-DCI from one or more TRPs.

When the wireless communication device receives PDSCHs transmitted by FDM from TRP0 and TRP1 based on S-DCI, the channel and transmitted signal between the wireless communication device and the TRPs may be expressed as in Equation 9 below.

는 무선 통신 장치와 TRP들간 PDSCH가 지나는 채널을 지칭할 수 있다.

는 송신된 신호를 지칭할 수 있다.

는 TRP0과 무선 통신 장치간의 채널을 지칭할 수 있다.

는 TRP1과 무선 통신 장치간 PDSCH가 지나는 채널을 지칭할 수 있다. k는 k번째 자원 요소를 지칭할 수 있다. l은 l번째OFDM 심볼을 지칭할 수 있다.In Equation 9,

May refer to a channel through which the PDSCH between the wireless communication device and the TRPs passes.

may refer to a transmitted signal.

may refer to a channel between TRP0 and the wireless communication device.

May refer to a channel through which the PDSCH between the TRP1 and the wireless communication device passes. k may refer to a k-th resource element. l may refer to the lth OFDM symbol.

A wireless communication device can improve transmission and reception performance by designing a hybrid beamforming matrix that maximizes the capacity of a channel through which the PDSCH passes. When a wireless communication device receives PDSCHs from TRP0 and TRP1, a hybrid beamforming matrix that maximizes the capacity of a channel through which the PDSCH passes may be expressed as in Equation 10 below.

는 k 번째 자원 요소(resource element)에서 TRP0와 무선 통신 장치간의 PDSCH가 지나는 채널을 지칭할 수 있다.

는 k 번째 자원 요소에서 TRP1과 무선 통신 장치간의 PDSCH가 지나는 채널을 지칭할 수 있다.

는 무선 통신 장치와 TRP0 간 PDSCH가 지나는 자원 요소의 개수를 지칭할 수 있다.

는 무선 통신 장치와 TRP1 간 PDSCH가 지나는 자원 요소의 개수를 지칭할 수 있다.In Equation 10,

May refer to a channel through which the PDSCH between TRP0 and the wireless communication device passes in the k-th resource element.

May refer to a channel through which the PDSCH between TRP1 and the wireless communication device passes in the k-th resource element.

may refer to the number of resource elements through which the PDSCH between the wireless communication device and TRP0 passes.

may refer to the number of resource elements through which the PDSCH between the wireless communication device and the TRP1 passes.

When the wireless communication device receives a reference signal transmitted by SFN, the wireless communication device cannot separate and observe a channel between the wireless communication device and the TRP0 and a channel between the wireless communication device and the TRP1. When the frequency selectivity of the channel is not large, the hybrid beamforming matrix may be expressed as an approximation of Equation 11 below.

In addition, in this case, the channel through which the PDSCH passes and the channel through which the SFN-transmitted reference signal passes can be viewed as the same. If this is expressed as an equation, it can be expressed as in Equation 12 below.

When a wireless communication device receives FDMed PDSCHs from TRP0 and TRP1 based on S-DCI and receives a reference signal that is SFN and transmitted, the wireless communication device performs hybrid beamforming to maximize the channel capacity estimated from the reference signal. You can design a matrix. Accordingly, the wireless communication device can design a hybrid beamforming matrix considering both the channel between TRP0 and the wireless communication device and the channel between TRP1 and the wireless communication device. If this is expressed as an equation, it can be expressed as Equation 13 below.

는 k번째 자원 요소에서 기준 신호가 지나는 채널을 지칭할 수 있다. N_RS는 기준 신호의 자원 요소의 개수를 지칭할 수 있다.In Equation 13,

may indicate a channel through which the reference signal passes in the k-th resource element. N _RS may refer to the number of resource elements of the reference signal.

When the wireless communication device receives a reference signal that is transmitted as being non-SFN, the wireless communication device can separate and observe a channel between the wireless communication device and TRP0 and a channel between the wireless communication device and TRP1 using the received reference signal. .

When the wireless communication device receives PDSCHs FDMed from TRP0 and TRP1 based on S-DCI and receives a non-SFN reference signal transmitted, the capacity of the reference signal channel transmitted from TRP0 and the reference signal channel transmitted from TRP1 The sum of the capacities can be maximized. Accordingly, the wireless communication device can design a hybrid beamforming matrix considering both the channel between the wireless communication device and the TRP0 and the channel between the wireless communication device and the TRP1. If this is expressed as an equation, it can be expressed as in Equation 14 below.

는 무선 통신 장치가 TRP0로부터 수신하는 PDSCH의 자원요소 개수를 지칭할 수 있다.

는 무선 통신 장치가 TRP0로부터 수신하는 기준 신호의 자원요소 개수를 지칭할 수 있다.

는 기준 신호가 무선 통신 장치와 TRP0 사이에서 지나는 채널을 지칭할 수 있다. In Equation 14,

may refer to the number of resource elements of the PDSCH received by the wireless communication device from TRP0.

may refer to the number of resource elements of a reference signal received by the wireless communication device from TRP0.

may refer to a channel through which the reference signal passes between the wireless communication device and TRP0.

는 무선 통신 장치가 TRP1로부터 수신하는 PDSCH의 자원요소 개수를 지칭할 수 있다.

는 무선 통신 장치가 TRP1로부터 수신하는 기준 신호의 자원요소 개수를 지칭할 수 있다.

는 기준 신호가 무선 통신 장치와 TRP1 사이에서 지나는 채널을 지칭할 수 있다.

may refer to the number of resource elements of the PDSCH received by the wireless communication device from TRP1.

may refer to the number of resource elements of the reference signal received by the wireless communication device from TRP1.

may refer to a channel through which the reference signal passes between the wireless communication device and the TRP1.

3. The wireless communication device receives a PDSCH transmitted by spatial division multiplexing (SDM) based on S-DCI from one or more TRPs.

When the wireless communication device receives PDSCHs transmitted through SDM from TRP0 and TRP1 based on S-DCI, the channel and transmitted signal between the wireless communication device and the TRPs may be expressed as in Equation 15 below.

A wireless communication device can improve transmission and reception performance by designing a hybrid beamforming matrix that maximizes the capacity of a channel through which the PDSCH passes. The hybrid beamforming matrix can be expressed as Equation 16 below.

A wireless communication device can improve transmission and reception performance by designing a hybrid beamforming matrix that maximizes the capacity of a channel through which the PDSCH passes.

When a wireless communication device receives a reference signal transmitted through SFN, it can be considered that the channel through which the SDM PDSCH passes and the channel through which the SFN reference signal passes are the same. If this is expressed as an equation, it can be expressed as Equation 17 below.

When a wireless communication device receives SDMed PDSCHs from TRP0 and TRP1 based on S-DCI and receives a reference signal that is SFN and transmitted, the wireless communication device performs hybrid beamforming to maximize the channel capacity estimated from the reference signal. You can design a matrix. Accordingly, the wireless communication device can design a hybrid beamforming matrix considering both the channel between the wireless communication device and the TRP0 and the channel between the wireless communication device and the TRP1. In this case, the hybrid beamforming matrix may be expressed as in Equation 18 below.

는 k번째 자원 요소에서 기준 신호가 지나는 채널을 지칭할 수 있다. N_RS는 기준 신호의 자원 요소의 개수를 지칭할 수 있다.In Equation 18,

may indicate a channel through which the reference signal passes in the k-th resource element. N _RS may refer to the number of resource elements of the reference signal.

When the wireless communication device receives a non-SFN transmitted reference signal, a channel between the wireless communication device and the TRP0 and a channel between the wireless communication device and the TRP1 can be separated and observed using the reference signals.

TRP may transmit a reference signal using one antenna port. For example, TRP may transmit a synchronization signal block (SSB). That is, the reference signal may be transmitted based on a single port. When the reference signal is transmitted based on a single port, the channel through which the SDM transmitted PDSCH passes can be expressed as in Equation 19 below.

는 재구성된 채널을 지칭할 수 있다. 재구성된 채널의의 1 번째 열은 TRP0으로부터 수신되는 기준 신호에 기초하여 구성될 수 있다. 예를 들어, 재구성된 채널의 1 번째 열은 TRP0으로부터 수신되는 싱글 포트에 기초한 기준 신호가 지나는 채널로 구성될 수 있다. 재구성된 채널의 2 번째 열은 TRP1로부터 수신되는 기준 신호로 구성될 수 있다. 예를 들어, 재구성된 채널의 2 번째 열은 TRP1로부터 수신되는 싱글 포트에 기초한 기준 신호가 지나는 채널로 구성될 수 있다. 상술한 실시 예와 같이 TRP가 두개인 경우로 제한되지 않으며, TRP 개수는 확장될 수 있다.

은 무선 통신 장치의 수신 안테나 개수를 지칭할 수 있다.In Equation 19,

may refer to a reconstructed channel. The first column of the reconstructed channel may be configured based on the reference signal received from TRP0. For example, the first column of the reconstructed channels may consist of a channel through which a reference signal based on a single port received from TRP0 passes. The second column of the reconstructed channel may consist of a reference signal received from TRP1. For example, the second column of the reconstructed channels may consist of a channel through which a reference signal based on a single port received from TRP1 passes. As in the above-described embodiment, it is not limited to the case of two TRPs, and the number of TRPs may be extended.

may refer to the number of reception antennas of the wireless communication device.

When the wireless communication device receives PDSCHs SDMed from TRP0 and TRP1 based on S-DCI and receives a reference signal transmitted as being non-SFN, the wireless communication device transmits the channel of the reference signal transmitted from TRP0 and TRP1 The channels of the reference signals are combined as shown in Equation 19, and the capacity of the combined channels can be maximized. Accordingly, the wireless communication device can design a hybrid beamforming matrix considering both the channel between the wireless communication device and TRP0 and the channel between the wireless communication device and TRP1. The hybrid beamforming matrix can be expressed as Equation 20 below.

는 상술한 수학식 19의 재구성된 채널을 지칭할 수 있다. In Equation 20,

may refer to the reconstructed channel of Equation 19 described above.

TRP may transmit a reference signal using one or more antenna ports. For example, the TRP may transmit a channel state information-reference signal (CSI-RS). That is, the reference signal may be transmitted based on multi ports. When the reference signal is transmitted based on multi-ports equal to the number of layers, the wireless communication device may design a hybrid beamforming matrix as follows.

When the wireless communication device receives PDSCHs transmitted through SDM based on S-DCI from TRP0 and TRP1 and receives a reference signal transmitted through non-SFN, the capacity of the reference signal channel transmitted from TRP0 and transmitted from TRP1 The sum of capacities of reference signal channels can be maximized. Accordingly, the wireless communication device can design a hybrid beamforming matrix considering both the channel between the wireless communication device and TRP0 and the channel between the wireless communication device and TRP1. The hybrid beamforming matrix may be expressed as in Equation 21 below.

은 TRP0가 전송하는 기준 신호 자원 요소의 개수를 지칭할 수 있다.

은 TRP1이 전송하는 기준 신호 자원 요소의 개수를 지칭할 수 있다.

는 TRP0가 전송하는 기준 신호가 지나는 채널을 지칭할 수 있다.

는 TRP1이 전송하는 기준 신호가 지나는 채널을 지칭할 수 있다.In Equation 21,

may refer to the number of reference signal resource elements transmitted by TRP0.

may refer to the number of reference signal resource elements transmitted by TRP1.

may refer to a channel through which a reference signal transmitted by TRP0 passes.

may refer to a channel through which a reference signal transmitted by TRP1 passes.

4. The wireless communication device receives PDSCH transmitted through TDM based on M-DCI from one or more TRPs.

When the wireless communication device receives the PDSCH transmitted through TDM from TRP0 and TRP1 based on M-DCI, the channel and transmitted signal between the wireless communication device and the TRPs may be expressed as in Equation 22 below.

Hereinafter, Equations 22 to 28 can be clearly understood by the above-described equations.

When the wireless communication device receives the reference signal transmitted by SFN, the channel between the wireless communication device and the TRP0 and the channel between the wireless communication device and the TRP1 cannot be separated and observed.

When the wireless communication device receives the PDSCH transmitted by TDM from TRP0 and TRP1 based on M-DCI and receives a reference signal transmitted based on SFN, the wireless communication device maximizes the capacity of the channel estimated from the reference signal A hybrid beamforming matrix can be designed. Accordingly, the wireless communication device can design a hybrid beamforming matrix capable of robustly receiving both the channel between the wireless communication device and the TRP0 and the channel between the wireless communication device and the TRP1. For example, the hybrid beamformer may be designed to maximize the capacity of an effective channel generated by applying a beamforming matrix of the hybrid beamformer to the estimated channel. The hybrid beamforming matrix can be expressed as Equation 23 below.

When the wireless communication device receives reference signals transmitted from TRP0 and TRP1 based on non-SFN, the channel between the wireless communication device and TRP0 and the channel between the wireless communication device and TRP1 can be separated and observed using the reference signal. .

Maximizing the capacity of the reference signal channel transmitted from TRP0 when the wireless communication device receives PDSCH transmitted by TDM based on M-DCI from TRP0 and TRP1 and receives a reference signal transmitted based on non-SFN A hybrid beamforming matrix that maximizes the hybrid beamforming matrix and the capacity of the reference signal channel transmitted from TRP1 can be designed. Each hybrid beamforming matrix may be applied according to the TCI state of the OFDM symbol. The hybrid beamforming matrix may be expressed as in Equation 24 below.

5. The wireless communication device receives PDSCHs transmitted by FDM based on M-DCI from TRP0 and TRP1.

When the wireless communication device receives the PDSCH transmitted by FDM from TRP0 and TRP1 based on M-DCI, the channel and transmitted signal between the wireless communication device and the TRPs may be expressed as in Equation 25 below.

A wireless communication device can improve transmission and reception performance by designing a hybrid beamforming matrix that maximizes the capacity of a channel through which the PDSCH passes.

When the wireless communication device receives the reference signals transmitted based on the SFN, the channel between the wireless communication device and the TRP0 and the channel between the wireless communication device and the TRP1 cannot be separated and observed. When the frequency selectivity of the channel is not large, the number of resource elements of the PDSCH received by the wireless communication device from TRP0 and TRP1 is similar, or the channels between TRP0 and TRP1 are fully overlapped, the hybrid beamforming matrix Approximation can be expressed as Equation 26 below.

When the wireless communication device receives a PDSCH transmitted by FDM based on M-DCI from TRP0 and TRP1 and receives a reference signal transmitted by SFN, the wireless communication device maximizes the capacity of the channel estimated from the reference signal. Forming matrices can be designed. Accordingly, the wireless communication device may design a hybrid beamforming matrix considering both the channel between the wireless communication device and TRP0 and the channel between the wireless communication device and TRP1. The hybrid beamforming matrix may be expressed as Equation 27 below.

When receiving a reference signal transmitted based on non-SFN, the wireless communication device may separately observe a channel between the wireless communication device and the TRP0 and a channel between the wireless communication device and the TRP1 using the reference signal.

When the wireless communication device receives the PDSCH transmitted by FDM from TRP0 and TRP1 based on M-DCI and receives the reference signal transmitted by non-SFN, the wireless communication device determines the capacity of the reference signal channel transmitted from TRP0 and The sum of the capacities of the reference signal channels transmitted from TRP1 can be maximized. Accordingly, the wireless communication device may design a hybrid beamforming matrix considering both the channel between the wireless communication device and TRP0 and the channel between the wireless communication device and TRP1. The hybrid beamforming matrix can be expressed as Equation 28 below.

6 illustrates a method of operating a wireless communication device according to exemplary embodiments of the present disclosure. Hereinafter, an embodiment of an operating procedure of the wireless communication device described above in the present disclosure will be described.

In step S601, the wireless communication device may receive a first reference signal and a second reference signal from the first TRP and the second TRP, respectively. Specifically, the wireless communication device may receive a first reference signal from a first TRP and receive a second reference signal from a second TRP. The first reference signal and the second reference signal may be transmitted after being SFN.

In step S603, the wireless communication device may determine a beamforming parameter based on at least one of the first reference signal and the second reference signal. Specifically, the wireless communication device may estimate channels of a plurality of subcarriers based on at least one of the first reference signal and the second reference signal. In addition, the wireless communication device may determine a beamforming parameter having a maximum value of an effective channel capacity between the first and second TRPs and the wireless communication device using the estimated channels. An effective channel may refer to a channel through which a signal is transmitted and received based on an estimated channel and a beamforming matrix. For example, an effective channel may be expressed as a product of an actual channel (H) and a beamforming matrix (W). The beamforming parameter may include at least one of an offset value of a phase shifter included in a radio frequency integrated circuit (RFIC) and an amplitude value of a power amplifier. In addition, the beamforming parameters may include parameters related to a baseband beamforming matrix.

In step S605, the wireless communication device may receive the PDSCH based on the determined beamforming parameter. Specifically, the wireless communication device may adjust a reception beam based on the determined beamforming parameter, and receive a first PDSCH from a first TRP and a second PDSCH from a second TRP through the adjusted reception beam. . The first PDSCH and the first reference signal may have a QCL-type-D relationship. The second PDSCH and the second reference signal may have a QCL-type-D relationship. The reference signal may include at least one of a synchronization signal block (SSB), a channel state information-reference signal (CSI-RS), and a tracking reference signal (TRS), and is not limited to the above-described embodiment.

7 illustrates an operating method of a wireless communication device according to exemplary embodiments of the present disclosure. Hereinafter, an embodiment of an operating procedure for a case in which the wireless communication device described above in the present disclosure receives a reference signal transmitted by SFN from multiple TRPs and receives a PDSCH based on S-DCI will be described.

In step S701, the wireless communication device may receive reference signals transmitted through the same time and frequency resources from the first TRP and the second TRP.

In step S703, the wireless communication device may determine a beamforming parameter based on the received reference signals. For example, the wireless communication device may estimate channels of the plurality of subcarriers based on any one of the first reference signal and the second reference signal. The wireless communication device may determine the beamforming parameter having the maximum capacity of an effective channel using the estimated channels.

In step S705, the wireless communication device may receive the PDSCH based on the beamforming parameters. For example, the wireless communication device may adjust a reception beam based on the determined beamforming parameter, and receive a first PDSCH from a first TRP and a second PDSCH from a second TRP through the adjusted reception beam. For example, the first PDSCH and the second PDSCH may be transmitted through TDM. As another example, the first PDSCH and the second PDSCH may be FDMed and transmitted. As another example, the first PDSCH and the second PDSCH may be transmitted through SDM. Specifically, the wireless communication device may receive the first PDSCH from the first TRP through a first layer and receive the second PDSCH from the second TRP through a second layer.

8 illustrates an operating method of a wireless communication device according to exemplary embodiments of the present disclosure. Hereinafter, an embodiment of an operating procedure for a case in which the wireless communication device described above in the present disclosure receives a non-SFN reference signal transmitted from multiple TRPs and receives a PDSCH based on S-DCI will be described.

In step S801, the wireless communication device may receive a first reference signal and a second reference signal having different at least one of time and frequency resources from the first TRP and the second TRP, respectively.

In step S803, the wireless communication device may determine a beamforming parameter based on the received first reference signal and second reference signal. In step S805, the wireless communication device may receive the PDSCH based on the beamforming parameter.

For example, the wireless communication device may receive PDSCH transmitted through TDM from the first TRP and the second TRP. Specifically, the wireless communication device determines a first reception beamforming parameter that maximizes the capacity of an effective channel between the first TRP and the wireless communication device based on the first reference signal, and based on the second reference signal, the second A second reception beamforming parameter maximizing the capacity of an effective channel between the TRP and the wireless communication device may be determined. The wireless communication device adjusts a reception beam based on the determined first reception beamforming parameter and the second reception beamforming parameter, and transmits the first PDSCH through TDM from the first TRP and the second TRP based on the adjusted reception beam. And a second PDSCH may be received. As a specific example, the wireless communication device adjusts the reception beam based on the first reception beamforming parameter in a first symbol period in which the first PDSCH from the first TRP is received, and the first reception beam from the second TRP is received. In a second symbol interval in which 2 PDSCHs are received, the Rx beam may be adjusted based on the second Rx beamforming parameter.

As another example, the wireless communication device may receive the PDSCH transmitted through FDM from the first TRP and the second TRP. The wireless communication device determines a first value to which a weight corresponding to the number of resource elements of the first PDSCH is applied to the capacity of an effective channel between the first TRP and the wireless communication device, and an effective value between the second TRP and the wireless communication device. The beamforming parameter may be determined such that a third value obtained by adding a second value to which a weight corresponding to the number of resource elements of the second PDSCH is applied to the capacity of the channel is the maximum value. The wireless communication device may adjust the reception beam based on the determined beamforming parameter. The wireless communication device may receive the first PDSCH and the second PDSCH that are FDMed and transmitted through the adjusted reception beam.

As another example, the wireless communication device may receive PDSCH transmitted through SDM from the first TRP and the second TRP. When the first reference signal and the second reference signal are transmitted through one antenna port, the wireless communication device maximizes the capacity of an effective channel for the first layer based on the first reference signal and transmits the second reference signal to the second reference signal. Based on this, it is possible to determine the beamforming parameter maximizing the capacity of an effective channel for the second layer. The wireless communication device adjusts a reception beam based on the determined beamforming parameter, receives the first PDSCH through the first layer from the first TRP based on the adjusted reception beam, and receives the first PDSCH from the second TRP. The second PDSCH may be received through layer 2. That is, the wireless communication device may receive the first PDSCH and the second PDSCH transmitted through SDM.

As another example, the wireless communication device may receive PDSCH transmitted through SDM from the first TRP and the second TRP. When each of the first reference signal and the second reference signal is transmitted through a plurality of antenna ports, the wireless communication device determines the capacity of an effective channel for a first layer including one or more layers and the first reference signal based on the first reference signal. The beamforming parameter having the maximum value of the sum of capacities of effective channels for a second layer including one or more layers may be determined based on 2 reference signals. The wireless communication device may determine the beamforming parameter that maximizes the sum of the average of the effective channel capacities between the first TRP and the wireless communication device and the average of the effective channel capacities between the second TRP and the wireless communication device. there is. The wireless communication device adjusts the reception beam based on the determined beamforming parameter, receives the first PDSCH through the first layer from the first TRP based on the adjusted reception beam, and receives the first PDSCH from the second TRP. The second PDSCH may be received through the second layer. Here, the number of the first layer and the number of antenna ports of the first reference signal may be the same, and the number of the second layer and the number of antenna ports of the second reference signal may be the same.

9 illustrates a wireless communication device according to an exemplary embodiment of the present disclosure.

Referring to FIG. 9 , a wireless communication device 30 may include one or more processors 310 and one or more RFICs 320 . The processor 310 may control the RFIC 320 and may be configured to implement the operation method and operation flowcharts of the wireless communication device 30 of the present disclosure. The wireless communication device 30 may include a plurality of antennas, and the RFIC 320 may transmit and receive radio signals through one or more antennas. At least some of the plurality of antennas may correspond to transmit antennas. The transmitting antenna may transmit a radio signal to an external device (eg, another user equipment (UE) or a base station (BS)) other than the wireless communication device 30 . At least some of the remaining antennas may correspond to receiving antennas. A receiving antenna may receive a radio signal from the external device. The wireless communication device 30 may receive the PDSCH from multiple TRPs.

For example, the RFIC 320 may receive a first reference signal from a first transmission point (TRP) and receive a second reference signal from a second TRP. The processor 310 may estimate channels of a plurality of subcarriers based on at least one of the first reference signal and the second reference signal. The processor 310 may determine a beamforming parameter having a maximum capacity of an effective channel between the first and second TRPs and the wireless communication device using the estimated channels, and based on the determined beamforming parameter The receiving beam can be adjusted. The RFIC 320 may receive a first PDSCH from a first TRP and a second PDSCH from a second TRP through the adjusted Rx beam.

10 is a block diagram illustrating an electronic device 1000 according to an exemplary embodiment of the present disclosure. Referring to FIG. 10 , an electronic device 1000 includes a memory 1010, a processor unit 1020, an input/output control unit 1040, a display unit 1050, an input device 1060, and a communication processing unit 1090. can include Here, a plurality of memories 1010 may exist. Here's a look at each component:

The memory 1010 may include a program storage unit 1011 for storing a program for controlling the operation of an electronic device and a data storage unit 1012 for storing data generated during program execution. The data storage unit 1012 may store data necessary for the operation of the application program 1013 and the beamforming processing program 1014 . The program storage unit 1011 may include an application program 1013 and a beamforming processing program 1014 . Here, the program included in the program storage unit 1011 may be expressed as an instruction set as a set of instructions.

The application program 1013 includes an application program that operates in an electronic device. That is, the application program 1013 may include instructions of an application driven by the processor 1022 . The beamforming processing program 1014 may determine a beamforming parameter such that the capacity of an effective channel between the TRP and the wireless communication device has a maximum value according to embodiments of the present disclosure.

The peripheral device interface 1023 may control the connection between the I/O peripheral device of the base station and the processor 1022 and the memory interface 1021 . The processor 1022 controls the base station to provide a corresponding service using at least one software program. In this case, the processor 1022 may execute at least one program stored in the memory 1010 to provide a service corresponding to the corresponding program.

The input/output control unit 1040 may provide an interface between an input/output device such as the display unit 1050 and the input device 1060 and the peripheral device interface 1023 . The display unit 1050 displays status information, input text, a moving picture, a still picture, and the like. For example, the display unit 1050 may display application program information driven by the processor 1022 .

The input device 1060 may provide input data generated by selection of an electronic device to the processor unit 1020 through the input/output controller 1040 . In this case, the input device 1060 may include a keypad including at least one hardware button and a touch pad that detects touch information. For example, the input device 1060 may provide touch information, such as a touch detected through a touch pad, a touch movement, or a touch release, to the processor 1022 through the input/output control unit 1040 . The electronic device 1000 may include a communication processing unit 1090 that performs communication functions for voice communication and data communication.

As above, exemplary embodiments have been disclosed in the drawings and specifications. Although the embodiments have been described using specific terms in this specification, they are only used for the purpose of explaining the technical idea of the present disclosure, and are not used to limit the scope of the present disclosure described in the claims. . Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical scope of protection of the present disclosure should be determined by the technical spirit of the appended claims.

Claims (20)

A wireless communication device supporting communication with multiple transmission and reception points (TRPs),
A radio frequency integrated circuit (RFIC) for receiving a first reference signal from a first TRP and receiving a second reference signal from a second TRP; and
A processor for estimating channels of a plurality of subcarriers based on at least one of the first reference signal and the second reference signal;
The processor determines a beamforming parameter having a maximum capacity of an effective channel between the first and second TRPs and the wireless communication device using the estimated channels, and determines a reception beam based on the determined beamforming parameter. adjust the
Wherein the RFIC receives a first physical downlink shared channel (PDSCH) from the first TRP through the adjusted receive beam and receives a second PDSCH from the second TRP. According to claim 1,
The beamforming parameter includes at least one of an offset value of a phase shifter included in the RFIC and an amplitude value of a power amplifier. According to claim 1,
When the first reference signal and the second reference signal are received through the same time and frequency resources, the processor determines the channel of the plurality of subcarriers based on any one of the first reference signal and the second reference signal. , and determining the beamforming parameter having the maximum capacity of an effective channel using the estimated channels;
The processor adjusts the reception beam based on the determined beamforming parameter, and the first PDSCH and the second PDSCH are time division multiplexed (TDM). According to claim 3,
Wherein the processor determines a beamforming parameter having a maximum value of a sum of capacities of effective channels of resource elements of the received reference signal. According to claim 1,
When the first reference signal and the second reference signal are received through resources in which at least one of time and frequency is different, the processor determines the validity of the first TRP and the wireless communication device based on the first reference signal. Determining a first reception beamforming parameter maximizing a capacity of a channel, and determining a second reception beamforming parameter maximizing a capacity of an effective channel between the second TRP and the wireless communication device based on the second reference signal and
The processor adjusts the RX beam based on the determined first RX beamforming parameter and second RX beamforming parameter,
The wireless communication device, characterized in that the first PDSCH and the second PDSCH are TDM
According to claim 1,
When the first reference signal and the second reference signal are received through the same time and frequency resources, the processor selects channels of a plurality of subcarriers based on either one of the first reference signal and the second reference signal. estimating, and determining a beamforming parameter having a maximum capacity of an effective channel using the estimated channel,
The processor adjusts the reception beam based on the determined beamforming parameter,
The wireless communication device, characterized in that the first PDSCH and the second PDSCH are frequency division multiplexed (FDM). According to claim 1,
When the first reference signal and the second reference signal are received through resources in which at least one of time and frequency is different, the processor sets the first PDSCH to the capacity of an effective channel between the first TRP and the wireless communication device. A first value to which a weight corresponding to the number of resource elements of is applied and a second value to which a weight corresponding to the number of resource elements of the second PDSCH is applied to the capacity of an effective channel between the second TRP and the wireless communication device Determining the beamforming parameter such that the summed third value is a maximum value;
The processor adjusts the reception beam based on the determined beamforming parameter,
The wireless communication device, characterized in that the first PDSCH and the second PDSCH are frequency division multiplexed (FDM). According to claim 1,
When the first reference signal and the second reference signal are received through the same time and frequency resources, the processor determines the channel of the plurality of subcarriers based on any one of the first reference signal and the second reference signal. , and determining the beamforming parameter having the maximum capacity of an effective channel using the estimated channel;
The processor adjusts the Rx beam based on the determined beamforming parameter, the RFIC receives the first PDSCH through a first layer from the first TRP based on the adjusted Rx beam, and the second A wireless communication device characterized in that for receiving the second PDSCH from the TRP through a second layer. According to claim 1,
When the first reference signal and the second reference signal are received through resources different in at least one of time and frequency and the first reference signal and the second reference signal are transmitted through one antenna port, the processor Determines the beamforming parameter that maximizes the capacity of an effective channel for a first layer based on the first reference signal and maximizes the capacity of an effective channel for a second layer based on the second reference signal,
The processor adjusts the reception beam based on the determined beamforming parameter, and the RFIC receives the first PDSCH through the first layer from the first TRP based on the adjusted reception beam. 2 The wireless communication device, characterized in that for receiving the second PDSCH from the TRP through the second layer. According to claim 1,
When the first reference signal and the second reference signal are received through resources different in at least one of time and frequency, and each of the first reference signal and the second reference signal is transmitted through a plurality of antenna ports, the The processor determines the capacity of an effective channel for a first layer including one or more layers based on the first reference signal and the capacity of an effective channel for a second layer including one or more layers based on the second reference signal. Determine the beamforming parameters whose sum has a maximum value;
Adjust the Rx beam based on the determined beamforming parameter, and the RFIC receives the first PDSCH through the first layer from the first TRP based on the adjusted Rx beam, and receives the first PDSCH from the second TRP. Receiving the second PDSCH through the second layer;
The number of layers of the first layer and the number of antenna ports of the first reference signal are the same, and the number of layers of the second layer and the number of antenna ports of the second reference signal are the same. A method of operating a wireless communication device that receives data from a first transmission and reception point (TRP) and a second TRP,
Receiving a first reference signal from a first TRP and receiving a second reference signal from a second TRP;
estimating channels of a plurality of subcarriers based on at least one of the first reference signal and the second reference signal;
determining a beamforming parameter having a maximum capacity of an effective channel between the first and second TRPs and the wireless communication device using the estimated channels;
adjusting a reception beam based on the determined beamforming parameter; and
Receiving a first PDSCH (physical downlink shared channel) from the first TRP through the adjusted reception beam, and receiving a second PDSCH from the second TRP; including, a method of operating a wireless communication device. According to claim 11,
The beamforming parameter includes at least one of an offset value of a phase shifter included in the RFIC and an amplitude value of a power amplifier. According to claim 11,
Estimating the channels of the plurality of subcarriers,
When the first reference signal and the second reference signal are received through the same time and frequency resources, the processor determines the channel of the plurality of subcarriers based on any one of the first reference signal and the second reference signal. estimate them,
The method of operating a wireless communication device, characterized in that the first PDSCH and the second PDSCH are time division multiplexed (TDM). According to claim 13,
Determining the beamforming parameters,
A method of operating a wireless communication device, characterized in that a sum of effective channel capacities of resource elements of a received reference signal determines a beamforming parameter having a maximum value. According to claim 11,
When the first reference signal and the second reference signal are received through resources in which at least one of time and frequency is different, the processor determines the validity of the first TRP and the wireless communication device based on the first reference signal. Determining a first reception beamforming parameter maximizing a capacity of a channel, and determining a second reception beamforming parameter maximizing a capacity of an effective channel between the second TRP and the wireless communication device based on the second reference signal and
The processor adjusts the Rx beam based on the first Rx beamforming parameter in a first symbol period in which the first PDSCH from the first TRP is received, and the second PDSCH from the second TRP is A method of operating a wireless communication device, characterized in that for adjusting the reception beam based on the second reception beamforming parameter in a received second symbol period. According to claim 11,
Estimating the channels of the plurality of subcarriers,
When the first reference signal and the second reference signal are received through the same time and frequency resources, the processor selects channels of a plurality of subcarriers based on either one of the first reference signal and the second reference signal. estimate,
The method of operating a wireless communication device, characterized in that the first PDSCH and the second PDSCH are frequency division multiplexed (FDM). According to claim 11,
Determining the beamforming parameters,
When the first reference signal and the second reference signal are received through resources different in at least one of time and frequency, the processor determines the effective channel capacity between the first TRP and the wireless communication device of the first PDSCH. A first value to which a weight corresponding to the number of resource elements is applied and a second value to which a weight corresponding to the number of resource elements of the second PDSCH is applied to the capacity of an effective channel between the second TRP and the wireless communication device are added Determining the beamforming parameter such that the third value obtained is the maximum value;
The method of operating a wireless communication device, characterized in that the first PDSCH and the second PDSCH are frequency division multiplexed (FDM). According to claim 11,
The step of estimating the plurality of subcarriers,
When the first reference signal and the second reference signal are received through the same time and frequency resources, the processor determines the channel of the plurality of subcarriers based on any one of the first reference signal and the second reference signal. estimate them,
Receiving the first PDSCH and the second PDSCH,
Based on the adjusted reception beam, the first PDSCH is received from the first TRP through a first layer, and the second PDSCH is received from the second TRP through a second layer. how it works. According to claim 11,
Determining the beamforming parameters,
When the first reference signal and the second reference signal are received through resources different in at least one of time and frequency and the first reference signal and the second reference signal are transmitted through one antenna port, the processor Determines the beamforming parameter that maximizes the channel capacity for the first layer based on the first reference signal and maximizes the channel capacity for the second layer based on the second reference signal,
Receiving the first PDSCH and the second PDSCH,
Based on the adjusted reception beam, the first PDSCH is received from the first TRP through the first layer, and the second PDSCH is received from the second TRP through the second layer. A method of operating a communication device. In a wireless communication system supporting communication of multiple transmission and reception points (TRPs) and a wireless communication device,
a first TRP;
a second TRP; and
Including; wireless communication device;
The first and second TRPs transmit first and second reference signals, respectively, to the wireless communication device, and the wireless communication device transmits first and second reference signals, respectively, from the first and second TRPs. receive a signal;
The wireless communication device estimates channels of a plurality of subcarriers based on at least one of the first reference signal and the second reference signal, and communicates with the first and second TRPs using the estimated channels. A beamforming parameter having a maximum capacity of an effective channel between devices is determined, a reception beam is adjusted based on the determined beamforming parameter, and a first PDSCH (physical downlink shared channel) and receive a second PDSCH from the second TRP.

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