KR102640345B1 - An wireless communication apparatus correcting for an offset with a base station and a method of operation thereof - Google Patents

Abstract

A method of operating a wireless communication device for correcting an offset with a base station according to the technical idea of the present disclosure includes the steps of changing from a first reception beam to a second reception beam within a Synchronization Signal Block (SSB) period, determining whether to perform an offset correction operation using a first target SSB received through a second reception beam; and determining to generate the first target SSB and a replacement offset based on the determination result, and performing the offset correction operation for the second received beam by selectively using any one of at least one first neighboring SSB received through the first receive beam.

Description

{An wireless communication apparatus correcting for an offset with a base station and a method of operation thereof}

The technical idea of the present disclosure is an invention related to a wireless communication device and a method of operating the same that corrects offset due to time synchronization error and carrier frequency difference with a base station.

The recent 5G communication system is a new radio access technology and aims to provide high-speed data services of several Gbps by using ultra-wideband with a bandwidth of 100 MHz or more compared to existing LTE and LTE-A. However, because it is difficult to secure an ultra-wideband frequency of 100MHz or more in the frequency band of hundreds of MHz or several GHz used in LTE and LTE-A, the 5G communication system uses a wide frequency band that exists in the frequency band of 6GHz or more to transmit signals. Methods of transmitting are being considered. Specifically, the 5G communication system is considering increasing the transmission rate using millimeter wave bands such as the 28GHz band or the 60GHz band. However, since the frequency band and the path loss of radio waves are proportional, the path loss of radio waves is large in such ultra-high frequencies, so the service area becomes small.

In the 5G communication system, in order to overcome this disadvantage of reduced service area, beamforming technology, which increases the reach of radio waves by generating a directional beam using multiple antennas, is gaining importance. Beamforming technology can be applied to each transmitting device (e.g., base station) and receiving device (e.g., terminal), and in addition to expanding the service area, it reduces interference caused by physical beam concentration in the target direction. It works.

In the 5G communication system, the direction of the transmission beam of the transmitter and the reception beam of the reception device must be synchronized to increase the effectiveness of beamforming technology, so technology to select the optimal transmission beam and reception beam is important.

The problem to be solved by the technical idea of the present disclosure is to provide a wireless communication device and a method of operating the same that can improve communication performance by continuously performing offset correction while selecting a reception beam that is optimally tuned to a predetermined base station in a wireless communication system. It's about doing it.

In order to achieve the above object, a method of operating a wireless communication device for correcting the offset with a base station according to the technical idea of the present disclosure is to transmit changing to a receiving beam, determining whether to perform an offset correction operation using the first target SSB received through the second receiving beam, and setting the first target SSB and an alternative offset based on the determination result. and performing the offset correction operation for the second received beam by selectively using any one of at least one first neighboring SSB, which is determined to generate and received through the first receive beam. .

A method of operating a wireless communication device that communicates with a base station through a best transmission/reception beam pair consisting of a first transmission beam and a first reception beam according to the technical idea of the present disclosure includes a plurality of second transmission beams other than the first transmission beam from the base station. Receiving a plurality of neighboring SSBs each transmitted through transmission beams through the first reception beam, changing the first reception beam to the second reception beam, and a target SSB transmitted through the first transmission beam. Receiving through the second reception beam and performing automatic frequency control or symbol timing control on the second reception beam by selectively using one of the target SSB and the neighboring SSBs.

A plurality of antennas that change the first reception beam into a second reception beam according to the technical idea of the present disclosure and receive an RF (Radio) signal from the base station, a local oscillator that generates an oscillation signal with a local oscillation frequency, A baseband signal including a target SSB received through the first reception beam and at least one neighboring SSB received through the second reception beam from an RF (Radio Frequency) signal and the oscillation signal received from the local oscillator. Determine whether to perform an automatic frequency control operation using an RF circuit that outputs and the target SSB, and selectively use any one of the target SSB and the at least one neighboring SSB based on the determination result to control the local and a processor that performs the automatic frequency control operation for the oscillation frequency.

A wireless communication device according to exemplary embodiments of the present disclosure operates an offset correction operation by selectively using any one of the target SSB and at least one neighboring SSB even when operating to update the best reception beam that is optimally tuned to the best transmission beam. There is an effect of improving communication performance by performing continuously.

The effects that can be obtained from 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 technical field to which the exemplary embodiments of the present disclosure belong from the following description. It can be clearly derived and understood by those who have it. That is, unintended effects resulting from implementing 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.

1 is a block diagram showing a wireless communication system according to an exemplary embodiment of the present disclosure.
Figure 2 is a diagram for explaining a synchronization signal including SSBs received from a base station.
Figure 3 is a block diagram showing a wireless communication device according to an exemplary embodiment of the present disclosure.
Figure 4 is a block diagram showing an automatic frequency controller according to an exemplary embodiment of the present disclosure.
FIG. 5 is a diagram illustrating the operation of the automatic frequency controller of FIG. 4 by way of example.
6A and 6B are diagrams for explaining a method of determining a neighboring SSB according to an exemplary embodiment of the present disclosure.
Figure 7 is a flowchart for explaining an operation method of an automatic frequency controller according to an exemplary embodiment of the present disclosure.
Figure 8 is a flowchart for explaining an operation method of an automatic frequency controller according to an exemplary embodiment of the present disclosure.
9A and 9B are flowcharts for explaining an operation method of an automatic frequency controller according to an exemplary embodiment of the present disclosure.
10A to 10C are diagrams for explaining a method of operating an automatic frequency controller according to an exemplary embodiment of the present disclosure.
Figure 11 is a block diagram showing a symbol timing recovery controller according to an exemplary embodiment of the present disclosure.
FIG. 12 is a diagram illustrating the operation of the symbol timing recovery controller of FIG. 11 by way of example.
13A and 13B are diagrams for explaining a method of operating a symbol timing recovery controller according to an exemplary embodiment of the present disclosure.
Figure 14 is a block diagram showing an electronic device according to an exemplary embodiment of the present disclosure.

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

FIG. 1 is a block diagram showing a wireless communication system 1 according to an exemplary embodiment of the present disclosure, and FIG. 2 is a diagram for explaining a synchronization signal including SSBs received from a base station.

As shown in FIG. 1, the wireless communication system 1 may include a base station 10 and a wireless communication device 100. For convenience of description, the wireless communication system 1 is shown in FIG. 1 as including only one base station 10, but this is only an exemplary embodiment, and the wireless communication system 1 may be implemented to include more base stations. And the technical idea of the present disclosure described below can also be applied to other base stations.

The wireless communication device 100 can connect to the wireless communication system 1 by transmitting and receiving signals with the base station 10. The wireless communication system 1 to which the wireless communication device 100 is accessible may be referred to as RAT (Radio Access Technology), and non-limiting examples include a 5th generation wireless (5G) communication system and a Long Term Evolution (LTE) communication system. , it may be a wireless communication system using a cellular network such as an LTE-Advanced communication system, a CDMA (Code Division Multiple Access) communication system, a GSM (Global System for Mobile Communications) communication system, or a WLAN (Wireless Local Area Network). ) communication system or any other wireless communication system. Hereinafter, the wireless communication system 1 to which the wireless communication device 100 is connected will be described assuming that it is a 5G communication system. However, exemplary embodiments of the present disclosure are not limited thereto, and may also be applied to subsequent next-generation wireless communication systems. It is clear that the ideas of the present disclosure can be applied.

The wireless communication network of the wireless communication system 1 may support multiple wireless communication devices, including the wireless communication device 10, to communicate by sharing available network resources. For example, in wireless communication networks, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA) Access), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA, etc. can be transmitted through various multiple access methods.

The base station 10 may generally refer to a fixed station that communicates with the wireless communication device 100 and another base station, and provides data and control by communicating with the wireless communication device 100 and/or other base stations. Information can be exchanged. For example, the base station 10 includes Node B, evolved-Node B (eNB), Next generation Node B (gNB), Sector, Site, Base Transceiver System (BTS), and Access Pint (AP). , Relay Node, RRH (Remote Radio Head), RU (Radio Unit), cell, small cell, etc. In this specification, base station can be interpreted as a comprehensive meaning representing some area or function covered by a Base Station Controller (BSC) in CDMA, Node-B in WCDMA, eNB or sector (site) in LTE, etc. It can cover various coverage areas such as mega cells, macro cells, micro cells, pico cells, femto cells and relay nodes, RRH, RU, and small cell communication ranges.

The wireless communication device 100 is a user equipment (UE) that may be fixed or mobile and may refer to any device capable of transmitting and receiving data and/or control information by communicating with a base station. For example, the wireless communication device 100 includes a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscribe station (SS), a wireless device, a handheld device, and a terminal. It may be referred to as (Terminal), etc.

Referring to FIG. 1, the wireless communication device 100 is connected to the base station 10 through a wireless channel and can provide various communication services. The base station 10 can service all user traffic through a shared channel, and can perform scheduling by collecting status information such as buffer status, available transmission power status, and channel status of the wireless communication device 100. . The wireless communication system 1 can support beamforming technology using Orthogonal Frequency Division Multiplexing (OFDM) as a wireless access technology. In addition, the wireless communication system 1 uses an adaptive modulation & coding (AMC) method that determines the modulation scheme and channel coding rate according to the channel status of the wireless communication device 100. can support.

The wireless communication system 1 can transmit and receive signals using a wide frequency band existing in a frequency band of 6 GHz or higher. For example, in the wireless communication system 1, the data transmission rate can be increased by using a millimeter wave band such as the 28 GHz band or the 60 GHz band. At this time, because the millimeter wave band has a relatively large signal attenuation per distance, the wireless communication system 1 can support transmission and reception based on a directional beam generated using multiple antennas to secure coverage. The wireless communication system 1 may perform a beam sweeping operation for directional beam-based transmission and reception.

Beam sweeping is a process in which the wireless communication device 100 and the base station 10 sequentially or randomly sweep directional beams with a predetermined pattern to determine transmission beams and reception beams whose directional directions are synchronized with each other. . A transmission beam and a reception beam whose orientation directions are tuned to each other may be determined as a transmission and reception beam pair. At this time, the determined transmission beam and reception beam may be referred to as a best transmission beam and a best reception beam, respectively. The beam pattern may be the shape of the beam determined by the width of the beam and the direction of the beam. Hereinafter, as a result of the beam sweeping operation, the first reception beam (RX_B1) among the plurality of reception beams (RX_B1 to RX_Bp) of the wireless communication device 100 is the best reception beam, and the plurality of transmission beams (TX_B1 to TX_Bn) of the base station 10 ), it is assumed that the first transmission beam (TX_B1) is determined as the best transmission beam. Thereafter, the first reception beam (RX_B1) is used to select a new best reception beam according to the variable communication environment of the wireless communication device 100 (e.g., communication environment changes due to movement of the wireless communication device 100). By sweeping with different reception beams, a plurality of Synchronization Signal Blocks (SSBs) transmitted from the base station 10 through a plurality of transmission beams (TX_B1 to TX_Bn) can be periodically received.

Referring to FIGS. 1 and 2, the base station 10 transmits a signal including any one of the first to nth SSBs (SSB1 to SSBn) through a plurality of transmission beams (TX_B1 to TX_Bn), respectively, to the wireless communication device 100. ) can be sent to. For example, the base station 10 may transmit a signal including a first SSB (SSB1) to the wireless communication device 100 through a first transmission beam (TX_B1) and through a second transmission beam (TX_B2) A signal including the second SSB (SSB2) may be transmitted to the wireless communication device 100. In this way, the base station 10 can transmit various SSBs (SSB1 to SSBn) through the transmission beams (TX_B1 to TX_Bn) to the wireless communication device 100, and the wireless communication device 100 can transmit the SSBs ( Using SSB1~SSBn), an operation to update the best reception beam that is optimally tuned to the best transmission beam can be continuously performed.

As shown in FIG. 2, SSB may include Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and Physical Broadcast Channel (PBCH). As an example, SSB may include four symbols, and PSS, SSS, and PBCH may be located in locations corresponding to certain resource blocks (RBs) in the direction of the frequency axis. Additionally, one resource block (RB) may be composed of 12 consecutive subcarriers. As an example, the PSS corresponding to the first symbol may be transmitted to the wireless communication device 100 through 127 subcarriers.

As an example, two SSBs may be placed in one slot of a signal, and the wireless communication device 100 transmits an SSB burst set to the base station 10 during a predetermined SSB period. It can be received from. As an example, assuming that the wireless communication system 1 is NR with subcarrier spacing of 15 kHz applied, the wireless communication device 100 configures n SSBs (SSB1 to SSBn) during an SSB period. An SSB burst set containing can be received from the base station 10. At this time, the length of one slot may be 1ms and the SSB period may be 20ms. However, this is only an exemplary embodiment, and is not limited to this. The number of SSBs included in the SSB burst set, the SSB period, and the length of one slot are determined by subcarrier spacing. It may vary depending on the size, synchronization signal period set in the base station 10, etc.

The wireless communication device 100 may receive SSBs (SSB1 to SSBn) from the base station 10. Hereinafter, the SSB transmitted from the base station 10 through the best transmission beam will be defined as the target SSB. For example, when the best transmission beam is the first transmission beam (TX_B1), the target SSB may be the first SSB (SSB1).

The wireless communication device 100 according to an exemplary embodiment of the present disclosure corrects the offset caused by the carrier frequency difference or time synchronization error with the base station 10 during a sweeping operation to update the best reception beam. The movements for this purpose can be performed continuously. In one embodiment, the operation to correct the offset includes an automatic frequency control operation to correct the frequency offset between the base station 10 and the wireless communication device 100 and a symbol timing offset between the base station 10 and the wireless communication device 100. It may include a symbol timing recovery operation for correction, etc.

As described above, assuming that the best transmission beam as a result of the beam sweeping operation is the first transmission beam (TX_B1) and the best reception beam is the first reception beam (RX_B1), hereinafter, a wireless communication device according to an exemplary embodiment of the present disclosure Describe the operation of (100).

The wireless communication device 100 may change the first reception beam (RX_B1) to the second reception beam (RX_B2) at any time within a predetermined SSB period in order to update the best reception beam. ) It is possible to determine whether to perform an offset correction operation for the second reception beam (RX_B2) using the target SSB (SSB1) received through ). That is, the wireless communication device 100 performs an offset correction operation for the first reception beam (RX_B1) using SSBs received through the first reception beam (RX_B1) within a predetermined SSB period, and performs an offset correction operation on the second reception beam (RX_B1). When changed to the beam (RX_B2), it can be determined whether to subsequently perform an offset correction operation for the second reception beam (RX_B2) using the target SSB (SSB1) received through the second reception beam (RX_B2). . Hereinafter, an offset correction operation for a specific reception beam may be interpreted as an offset correction operation performed based on a signal received through a specific reception beam.

The wireless communication device 100 may perform an offset correction operation for the second reception beam (RX_B2) by selectively using one of the target SSB and at least one neighboring SSB based on the determination result. The neighboring SSB is used to perform an offset correction operation on behalf of the target SSB and may be an SSB received through the best reception beam (eg, the first reception beam (RX_B1)) before being swept. A detailed determination method regarding neighboring SSBs will be described later with reference to FIGS. 6A and 6B.

The wireless communication device 100 according to embodiments of the present disclosure follows the offset correction operation for the first reception beam (RX_B1) even when changing from the first reception beam (RX_B1) to the second reception beam (RX_B2). 2 The offset correction operation for the reception beam (RX_B2) can be performed continuously.

The wireless communication device 100 according to an exemplary embodiment generates (or measures) the reception quality for the target SSB (SSB1), compares the reception quality and the reference quality, and when the reception quality is higher than the reference quality, the target SSB ( An offset correction operation for the second reception beam (RX_B2) can be determined using SSB1). Meanwhile, the wireless communication device 100 may determine an offset correction operation for the second reception beam (RX_B2) using at least one neighboring SSB when the reception quality for the target SSB (SSB1) is less than the reference quality. That is, when the reception quality for the target SSB (SSB1) received through the changed second reception beam (RX_B2) is poor, the wireless communication device 100 uses at least one neighboring SSB instead of the target SSB (SSB1). An offset correction operation may be performed for the second reception beam (RX_B2). Additionally, the reception quality of the SSB may include at least one of the Reference Signal Received Power (RSRP) of the SSB and the Signal to Noise Ratio (SNR) of the SSB. However, this is only an exemplary embodiment and is not limited to this, and the wireless communication device 100 may generate the reception quality of the SSB based on various metrics that can indicate the reception quality.

The wireless communication device 100 according to an exemplary embodiment of the present disclosure selectively uses any one of the target SSB and at least one neighboring SSB even when operating to update the best reception beam that is optimally tuned to the best transmission beam. There is an effect of improving communication performance by continuously performing the offset correction operation.

Figure 3 is a block diagram showing a wireless communication device 100 according to an exemplary embodiment of the present disclosure.

Referring to FIG. 3, the wireless communication device 100 may include a plurality of antennas 110, a radio frequency (RF) circuit 120, a processor 130, a local oscillator 140, and a memory 150. there is. The processor 130 according to an exemplary embodiment of the present disclosure may include an automatic frequency controller 131, a symbol timing recovery controller 132, and a sampler 135. Although not shown, the processor 130 may further include other components, such as an analog-to-digital converter. Each of the components included in the wireless communication device 100 may be a hardware block including an analog circuit and/or a digital circuit, or may be a software block including a plurality of instructions executed by the processor 130, etc. In some embodiments, the automatic frequency controller 131 or the symbol timing recovery controller 132 may be implemented within a modem chip.

The wireless communication device 100 may receive a signal transmitted from a base station through a downlink channel. The characteristics of the downlink channel may change due to the conditions of the wireless communication device 100 and the base station and/or surrounding circumstances. That is, an offset in communication parameters may occur between the wireless communication device 100 and the base station due to a carrier frequency difference or time synchronization error. The wireless communication device 100 may perform an operation to correct this offset to improve communication performance.

The RF circuit 120 may receive an input signal (IN) transmitted from a base station through a plurality of antennas 110 and an oscillation signal (OS) from the local oscillator 140. The RF circuit 120 may output a baseband signal (BS) from the input signal (IN) and the oscillation signal (OS) to the processor 130. Here, the input signal IN may be an RF signal having a high center frequency due to a carrier wave, and the oscillation signal OS may have a local oscillation frequency corresponding to the carrier wave. For example, the RF circuit 120 may be implemented as an analog down-conversion mixer and may generate a baseband signal (BS) by down-converting the frequency of the input signal (IN). At this time, if the local oscillation frequency does not match the carrier frequency of the input signal (IN), frequency offset may occur.

When performing an operation to update the best reception beam, the automatic frequency controller 131 according to an exemplary embodiment determines the frequency offset between the base station 10 and the wireless communication device 100 to one of the target SSB and at least one neighboring SSB. You can compensate by selectively using one. In some embodiments, the target SSB and at least one neighboring SSB may be received in the same SSB period. Specifically, when the operation to update the best reception beam changes from the first reception beam to the second reception beam, the automatic frequency controller 131 selects one of the target SSB and at least one neighboring SSB to receive the second reception beam. A frequency offset for the input signal (IN) received through the beam can be generated (or estimated). The automatic frequency controller 131 may generate a frequency control signal (F_CTR) to match the local oscillation frequency of the oscillation signal (OS) with the carrier frequency of the input signal (IN) based on the generated frequency offset. A specific example of the automatic frequency controller 131 will be described later with reference to FIGS. 4 to 10C.

Additionally, if the symbol timing for data sampling in the base station does not match the symbol timing for data sampling in the wireless communication device 100, symbol timing offset may occur.

When performing an operation to update the best reception beam, the symbol timing recovery controller 132 according to an exemplary embodiment sets the symbol timing offset between the base station 10 and the wireless communication device 100 to the target SSB and at least one neighboring SSB. You can correct it by selectively using any one of them. Specifically, when the first reception beam is changed from the second reception beam as a result of the operation to update the best reception beam, the symbol timing recovery controller 132 selects one of the target SSB and at least one neighboring SSB to receive the second reception beam. A symbol timing offset for the input signal (IN) received through the reception beam may be generated (or estimated). The symbol timing recovery controller 132 generates a symbol timing recovery control signal (STR_CTR) in the sampler 133 based on the generated symbol timing offset to match the symbol timing of the base station and the symbol timing of the wireless communication device 100. You can. A specific example of the symbol timing recovery controller 132 will be described later with reference to FIGS. 12 to 13B.

The memory 150 may store data required when the automatic frequency controller 131 and the symbol timing recovery controller 132 perform operations according to example embodiments of the present disclosure.

FIG. 4 is a block diagram showing the automatic frequency controller 131 according to an exemplary embodiment of the present disclosure, and FIG. 5 is a diagram illustrating the operation of the automatic frequency controller 131 of FIG. 4 by way of example.

Referring to FIG. 4, the automatic frequency controller 131 may include a neighboring SSB determiner 131a and an alternative frequency offset generator 131b. The neighboring SSB determiner 131a may determine at least one neighboring SSB required to perform a frequency offset correction operation on behalf of the target SSB from a plurality of SSBs received within a predetermined SSB period. Specific examples of this will be described later with reference to FIGS. 6A and 6B.

The alternative frequency offset generator 131b may generate an alternative frequency offset using at least one neighboring SSB determined from the neighboring SSB determiner 131a. The automatic frequency controller 131 may perform an automatic frequency control operation based on the generated alternative frequency offset. A specific example of the alternative frequency offset generator 131b will be described later with reference to FIGS. 8 to 10C.

However, in FIG. 4, each operation is described separately into the neighboring SSB determiner 131a and the alternative frequency offset generator 131b, but this is for convenience of explanation, and the described operations are performed by the automatic frequency controller 131 of the present disclosure. It can be defined as the actions performed.

In Figure 5, the j-th SSB (SSB_j,m) is the target SSB, the i-th SSB (SSB_i,m) and the k-th SSB (SSB_k,m) are neighboring SSBs, the best received beam is the first received beam, and the sweeping The reception beam changed from the best reception beam through the reception beam is assumed to be the second reception beam. The right horizontal direction in FIG. 5 is unrelated to the passage of time. In addition, it is clear that the embodiment shown in FIG. 5 is merely illustrative and the present disclosure should not be construed as limited thereto.

Referring further to FIG. 5, the wireless communication device may receive a plurality of SSBs (SSB_x,m to SSB_y,m) in the mth (where m is an arbitrary integer) SSB period from the base station. Specifically, the wireless communication device may receive the x-th SSB (SSB_x,m) and the y-th SSB (SSB_y,m), which are neighboring SSBs, through a first reception beam, and the j-th SSB, which is a target SSB, through a second reception beam. SSB (SSB_j,m) can be received. The automatic frequency controller 131 may continuously perform automatic frequency control for the first reception beam based on the frequency offset generated using the target SSB received in the SSB cycle before the mth SSB cycle. However, as the first reception beam is changed to the second reception beam within the mth SSB period, it is appropriate for the target SSB (SSB_j,m) received through the second reception beam to be used for the first automatic frequency control (AFC1). It may be necessary to determine whether or not

Accordingly, the automatic frequency controller 131 according to an exemplary embodiment of the present disclosure is configured to operate the target SSB (SSB_j,m) when the first reception beam is changed to the second reception beam in order to update the best reception beam within the m SSB period. ) can be used to determine whether to perform the first automatic frequency control (AFC1) for the second reception beam. The automatic frequency controller 131 may generate the reception quality of the target SSB (SSB_j,m) and determine whether to perform the first automatic frequency control (AFC1) based on the generated reception quality. For example, the automatic frequency controller 131 may perform the first automatic frequency control (AFC1) using the target SSB (SSB_j,m) when the reception quality of the target SSB (SSB_j,m) is higher than the reference quality. . The automatic frequency controller 131 generates channel estimates using at least one of PSS, SSS, and PBCH of the target SSB (SSB_j,m), and generates differential correlation results by calculating differential correlation for the generated channel estimates. You can. Because the frequency offset affects all subcarriers approximately equally across the entire bandwidth, the automatic frequency controller 131 multiplies the complex conjugate of the channel estimate at the current time index with the channel estimate at the previous time index and , differential correlation can be calculated by accumulating the multiplication results. Additionally, the automatic frequency controller 131 may calculate a phase estimate from the calculated differential correlation result. Here, the phase estimate may refer to an estimate of the phase change, and the phase change may be proportional to the frequency offset between the carrier frequency and the local oscillation frequency. Specifically, the frequency offset (Δf) can be calculated based on Equation 1 below.

[Equation 1]

Ym[k] may be a frequency domain channel estimation result in a resource element corresponding to the index of the kth reference signal in the mth symbol. δT is the distance between two symbols (for example, when trying to find the product between the m=Lth symbol and the m=L+2th symbol, δT can be 2), and Ns can be the number of available reference signals. . N may be the FFT size, and CP may be the length of the cyclic prefix.

The automatic frequency controller 131 can generate a frequency offset using the target SSB (SSB_j,m) based on Equation 1, and can perform the first automatic frequency control (AFC1) based on the generated frequency offset. .

When the reception quality of the target SSB (SSB_j,m) is less than the reference quality, the automatic frequency controller 131 uses the i-th SSB (SSB_i,m) and the k-th SSB (SSB_k,m), which are neighboring SSBs, to set the second automatic frequency Control (AFC2) and third automatic frequency control (AFC3) can be performed. In some embodiments, the automatic frequency controller 131 selects one of the ith SSB (SSB_i,m) and the kth SSB (SSB_k,m) and performs automatic frequency control corresponding thereto using the selected neighboring SSB. can do. The automatic frequency controller 131 can generate an alternative frequency offset based on Equation 1 using neighboring SSBs (SSB_i,m, SSB_k_m). Thereafter, the automatic frequency controller 131 may perform automatic frequency control (AFC2, AFC3) based on the alternative frequency offset.

Specific embodiments of automatic frequency control (AFC2, AFC3) using neighboring SSBs (SSB_i,m, SSB_k,m) will be described later with reference to FIGS. 8 to 10C.

6A and 6B are diagrams for explaining a method of determining a neighboring SSB according to an exemplary embodiment of the present disclosure. Below, description is made with reference to FIG. 3 .

Referring to FIGS. 3 and 6A, the processor 130 processes SSBs (SSB1 to SSBn) received through at least one SSB cycle before the mth SSB cycle of FIG. 5 or a plurality of SSB cycles including the mth SSB cycle. ) can be generated for each reception beam (RX_B1 to RX_Bp). For example, the processor 130 may generate the SNR or RSRP of the nth SSB (SSBn) when the nth SSB (SSBn) is received through the first to pth reception beams (RX_B1 to RX_Bp), respectively. The nth table (TB_SSBn) may include information about the reception quality of the nth SSB (SSBn) for each reception beam (RX_B1 to RX_Bp). In this way, each of the first to n-1 tables (TB_SSB1 to TB_SSBn-1) may include information about the reception quality of the corresponding SSB (SSB1 to SSBn-1) for each reception beam (RX_B1 to RX_Bp). there is. The first to nth tables (TB_SSB1 to TB_SSBn) may be stored in the memory 150, and the processor 130 may access the memory 150 to refer to the first to nth tables (TB_SSB1 to TB_SSBn). .

Referring further to FIG. 6B, the automatic frequency controller 131 refers to the first to nth tables (TB_SSB1 to TB_SSBn) of FIG. 6A to determine the hth received through the best reception beam (where h is any random number smaller than n). A reception quality of integer) can be obtained (S100). For example, when the best received beam is the first received beam (RX_B1), the automatic frequency controller 131 refers to the hth table (TB_SSBh) and selects the hth SSB (SSBh) corresponding to the first received beam (RX_B1). A reception quality of . The automatic frequency controller 131 can determine whether the obtained reception quality is equal to or higher than the standard quality (S110). The reference quality is set to determine neighboring SSBs and can be set in various ways. As an example, the reference quality may be set based on the reception quality of the target SSB received through the best reception beam.

When step S110 is 'Yes', the automatic frequency controller 131 may determine the hth SSB as the neighboring SSB (S120). If step S110 is 'No', or following step S120, the automatic frequency controller 131 may determine whether 'h' is 'n' (S130). When step S130 is 'No', 'h' may be counted up (S140) and step S100 may be followed. When step S130 is 'Yes', the automatic frequency controller 131 may perform automatic frequency control selectively using at least one neighboring SSB.

Figure 7 is a flowchart for explaining an operation method of an automatic frequency controller according to an exemplary embodiment of the present disclosure. Below, description is made with reference to FIG. 3 .

Referring to FIGS. 3 and 7 , the automatic frequency controller 131 may change the best reception beam formed on the antennas 110 to a reception beam with a different pattern (S200). For example, the automatic frequency controller 131 may change the first reception beam, which is the best reception beam formed in the antennas 110, to the second reception beam in order to update the best reception beam. At this time, the automatic frequency controller 131 may determine whether to perform automatic frequency control for the second reception beam using the target SSB received through the second reception beam (S210). In an exemplary embodiment, the automatic frequency controller 131 may perform the determination operation based on whether the reception quality of the target SSB received through the second reception beam is equal to or higher than the reference quality. The reference quality is set to determine whether to perform automatic frequency control using the target SSB and can be set in various ways.

In an exemplary embodiment, the reference quality may be set based on the reception quality of at least one neighboring SSB in the same SSB cycle in which the target SSB was received and the reception quality of the target SSB received in at least one different SSB cycle. Referring further to FIG. 5 for specific description, the reference quality is the reception quality of neighboring SSBs (SSB_i,m, SSB_k,m) in the mth SSB cycle in which the target SSB (SSB_j,m) is received and the mth SSB cycle. It may be set based on the reception quality of the target SSB received in at least one previous SSB cycle (eg, the m-1th SSB cycle). However, this is only an exemplary embodiment and is not limited to this, and the reference quality is varied to determine whether the error in the frequency offset generated using the target SSB received with the changed reception beam is within an acceptable range. It can be set based on metrics.

When step S210 is 'Yes', that is, when the reception quality of the target SSB is higher than the reference quality, the automatic frequency controller 131 can perform automatic frequency control using the target SSB (S220). When step S210 is 'No', that is, when the reception quality of the target SSB is less than the reference quality, the automatic frequency controller 131 may perform automatic frequency control using at least one neighboring SSB (S230).

Figure 8 is a flowchart for explaining an operation method of an automatic frequency controller according to an exemplary embodiment of the present disclosure. Below, description is made with reference to FIG. 3 .

Referring to FIGS. 3 and 8, after step S210 of FIG. 7, when it is determined to perform automatic frequency control using at least one neighboring SSB, the automatic frequency controller 131 receives the reception signal corresponding to the at least one neighboring SSB. Quality can be obtained (S231). As an example, the automatic frequency controller 131 may generate the reception quality of at least one neighboring SSB received through the best reception beam. The automatic frequency controller 131 may determine automatic frequency control suitability for at least one neighboring SSB (S233). That is, the automatic frequency controller 131 can determine whether automatic frequency control can be performed using at least one neighboring SSB. In an exemplary embodiment, the automatic frequency controller 131 may determine whether the reception quality of at least one neighboring SSB is above the standard quality. The reference quality is set to determine automatic frequency control suitability for at least one neighboring SSB and can be set in various ways. In an exemplary embodiment, the reference quality may be set based on reception qualities of at least one neighboring SSB received through a best reception beam in different SSB cycles.

When step S233 is 'Yes', that is, when the reception quality of at least one neighboring SSB is equal to or higher than the reference quality, the automatic frequency controller 131 generates (or estimates) an alternative frequency offset using the at least one neighboring SSB. Automatic frequency control can be performed based on these (S235). When step S237 is 'No', that is, when the reception quality of at least one neighboring SSB is below the reference quality, the automatic frequency controller 131 may skip automatic frequency control for the reception beam changed from the best reception beam ( S237).

9A and 9B are flowcharts for explaining an operation method of an automatic frequency controller according to an exemplary embodiment of the present disclosure. Below, description is made with reference to FIG. 3 .

Referring to FIGS. 3 and 9A, when there are a plurality of neighboring SSBs, after step S233 of FIG. 8, the automatic frequency controller 131 may select an SSB used for automatic frequency control among the neighboring SSBs (S235_1a). In an exemplary embodiment, the automatic frequency controller 131 may select a neighboring SSB with the best reception quality among neighboring SSBs. The automatic frequency controller 131 may perform automatic frequency control based on an alternative frequency offset corresponding to the selected SSB (S235_2a).

Referring further to FIG. 9B, when there are a plurality of neighboring SSBs, after step S233 of FIG. 8, the automatic frequency controller 131 may calculate the average of alternative frequency offsets corresponding to the neighboring SSBs (S235_1b). The automatic frequency controller 131 may perform automatic frequency control based on the calculated alternative frequency offset average (S235_2b).

10A to 10C are diagrams for explaining a method of operating an automatic frequency controller according to an exemplary embodiment of the present disclosure. Below, description is made with reference to FIG. 3 .

Referring to FIGS. 10A and 10B, the frequency offset between the transmission frequency (freq_TX) (or carrier frequency) of the base station and the local oscillation frequency of the wireless communication device 100 may be different for each SSB. As an example, in the m-1th SSB cycle before the mth SSB cycle of FIG. 5, the wireless communication device 100 receives the target SSB (SSB_j,m) from the base station through the best reception beam (e.g., the first reception beam). -1) and neighboring SSBs (SSB_i,m-1, SSB_k,m-1), and the frequency offset (Δfreq_SSBj, generated (or estimated) using the target SSB (SSB_j,m-1). m-1) are different from the frequency offsets (Δfreq_SSBi,m-1, Δfreq_SSBk,m-1) generated (or estimated) using neighboring SSBs (SSB_i,m-1, SSB_k,m-1). can do. For example, the frequency offset (Δfreq_SSBj,m-1) generated (or estimated) using the target SSB (SSB_j,m-1) and the ith SSB (SSB_i,m-1) are generated (or, There may be an i-th offset difference (diff_freq_i) between the estimated) frequency offsets (Δfreq_SSBi,m-1), and the frequency offset (Δfreq_SSBj, generated (or estimated) using the target SSB (SSB_j,m-1). m-1) and the k-th offset difference (diff_freq_k) may exist between the frequency offset (Δfreq_SSBk,m-1) generated (or estimated) using the k-th SSB (SSB_k,m-1).

The automatic frequency controller 131 uses the frequency offsets (Δfreq_SSBj,m-1, Δfreq_SSBi,m-1, Δfreq_SSBk,m-1) generated while performing the first to third automatic frequency control (AFC1 to AFC3). Offset differences (diff_freq_i, diff_freq_k) can be generated.

The automatic frequency controller 131 according to an exemplary embodiment uses the frequency offset generated (or estimated) using the target SSB received through the best reception beam in a predetermined SSB cycle and the neighboring SSBs received through the best reception beam. Offset differences for each of the generated (or estimated) frequency offsets can be generated. The automatic frequency controller 131 may reflect the generated offset differences in future automatic frequency control using at least one of the neighboring SSBs. Specifically, when the automatic frequency controller 131 generates (or estimates) alternative frequency offsets using the neighboring SSBs (SSB_i,m, SSB_k,m) received in the mth SSB cycle of FIG. 5, the ith Offset difference (diff_freq_i) and kth offset difference (diff_freq_k) can be applied.

Referring further to FIG. 10C, after step S233 of FIG. 8, the automatic frequency controller 131 may generate offset differences corresponding to neighboring SSBs (S235_1c). As an example, the automatic frequency controller 131 may generate offset differences from frequency offsets generated (or estimated) using the target SSB and neighboring SSBs received through the best reception beam in a predetermined SSB cycle. The automatic frequency controller 131 may generate an alternative frequency offset by applying the generated offset differences to the frequency offsets corresponding to neighboring SSBs (S235_2c). Specifically, the automatic frequency controller 131 can apply offset differences based on Equation 2 as follows:

[Equation 2]

where

According to some embodiments, each If the quality of is not known, a simple arithmetic average can be calculated as shown in Equation 3 below.

[Equation 3]

When there are multiple neighboring SSBs (SSB_x), the automatic frequency controller 131 sets a frequency offset (Δf _{SSB_j, m-1} ), the frequency offset (Δf _{SSB _ x,m -1} ) corresponding to the neighboring SSB (SSB_x,m-1), and the frequency offset (Δf _SSB ) corresponding to the neighboring SSB (SSB_x,m) in the mth SSB period. _{_ x,m} ), an alternative frequency offset (Δf _Alternate ) can be generated by calculating based on Equation 2 or Equation 3. The automatic frequency controller 131 may perform automatic frequency control based on the application result (eg, alternative frequency offset (Δf _Alternate )) (S235_3c).

FIG. 11 is a block diagram showing the symbol timing recovery controller 132 according to an exemplary embodiment of the present disclosure, and FIG. 12 is a diagram illustrating the operation of the symbol timing recovery controller 132 of FIG. 11 by way of example.

Referring to FIG. 11, the symbol timing recovery controller 132 may include a neighboring SSB determiner 132a and a replacement symbol timing offset generator 132b. The neighboring SSB determiner 132a may determine at least one neighboring SSB required to perform a symbol timing offset recovery operation on behalf of the target SSB from a plurality of SSBs received within a predetermined SSB period. Since the operation of the neighboring SSB determiner 132a can be applied to the embodiments of the neighboring SSB determiner 131a of FIG. 4 (FIGS. 6A and 6B), detailed details will be omitted.

The alternative symbol timing offset generator 132b may generate an alternative symbol timing offset using at least one neighboring SSB determined from the neighboring SSB determiner 132a. The symbol timing recovery controller 132 may perform a symbol timing recovery operation based on the generated replacement symbol timing offset. The exemplary embodiments of the above-described automatic frequency controller 131 (FIGS. 7 to 9B) may be applied to the symbol timing recovery controller 132 in the same or similar manner. That is, the same and similar to the automatic frequency controller 131 according to the above-described embodiments, the symbol timing recovery controller 132 operates when the best reception beam is changed from the best reception beam to another reception beam as a result of the operation to update the best reception beam. A symbol timing recovery operation for the changed reception beam can be performed by selecting one of the target SSB and at least one neighboring SSB received in the SSB cycle corresponding to .

In Figure 12, the j-th SSB (SSB_j,m) is the target SSB, the i-th SSB (SSB_i,m) and the k-th SSB (SSB_k,m) are neighboring SSBs, the best received beam is the first received beam, and the sweeping The reception beam changed from the best reception beam through the reception beam is assumed to be the second reception beam. The right horizontal direction in FIG. 12 is unrelated to the passage of time. Additionally, it is clear that the embodiment shown in FIG. 12 is merely illustrative and the present disclosure should not be construed as limited thereto.

Referring further to FIG. 12, the wireless communication device may receive a plurality of SSBs (SSB_x,m to SSB_y,m) in the mth (where m is an arbitrary integer) SSB period from the base station. Specifically, the wireless communication device may receive the x-th SSB (SSB_x,m) and the y-th SSB (SSB_y,m), which are neighboring SSBs, through a first reception beam, and the j-th SSB, which is a target SSB, through a second reception beam. SSB (SSB_j,m) can be received. The symbol timing recovery controller 132 may continuously perform a symbol timing recovery operation for the first received beam based on the symbol timing offset generated using the target SSB received in the SSB period before the mth SSB period. However, as the first reception beam is changed to the second reception beam within the mth SSB period, it is appropriate for the target SSB (SSB_j,m) received through the second reception beam to be used for first symbol timing recovery (STR1). It may be necessary to determine whether or not

Accordingly, the symbol timing recovery controller 132 according to an exemplary embodiment of the present disclosure is configured to operate the target SSB (SSB_j, m) can be used to determine whether to perform first symbol timing recovery (STR1) for the second reception beam. The symbol timing recovery controller 132 may generate the reception quality of the target SSB (SSB_j,m) and determine whether to perform the first symbol timing recovery (STR1) based on the generated reception quality. For example, the symbol timing recovery controller 132 may perform the first symbol timing recovery (STR1) using the target SSB (SSB_j,m) when the reception quality of the target SSB (SSB_j,m) is higher than the reference quality. there is. The symbol timing recovery controller 132 may generate a symbol timing offset using the target SSB (SSB_j,m), and may perform first symbol timing recovery (STR1) based on the generated symbol timing offset.

When the reception quality of the target SSB (SSB_j,m) is less than the reference quality, the symbol timing recovery controller 132 uses the i-th SSB (SSB_i,m) and the k-th SSB (SSB_k,m), which are neighboring SSBs, to create a second symbol. Timing recovery (STR2) and third symbol timing recovery (STR3) can be performed. In some embodiments, the symbol timing recovery controller 132 selects one of the ith SSB (SSB_i,m) and the kth SSB (SSB_k,m) and performs symbol timing recovery corresponding thereto using the selected neighboring SSB. It can be done.

13A and 13B are diagrams for explaining a method of operating a symbol timing recovery controller according to an exemplary embodiment of the present disclosure. Below, description is made with reference to FIG. 3 .

Referring to FIGS. 13A and 13B, the symbol timing offset between the transmission symbol timing (timing_TX) of the base station and the symbol timing of the wireless communication device 100 may be different for each SSB. As an example, in the m-1th SSB cycle before the mth SSB cycle of FIG. 5, the wireless communication device 100 receives the target SSB (SSB_j,m) from the base station through the best reception beam (e.g., the first reception beam). -1) and neighboring SSBs (SSB_i,m-1, SSB_k,m-1), and the symbol timing offset (Δtiming_SSBj) generated (or estimated) using the target SSB (SSB_j,m-1). ,m-1) is the symbol timing offsets (Δtiming_SSBi,m-1, Δtiming_SSBk,m-1) generated (or estimated) using neighboring SSBs (SSB_i,m-1, SSB_k,m-1) Each may be different. For example, the symbol timing offset (Δtiming_SSBj,m-1) generated (or estimated) using the target SSB (SSB_j,m-1) and the ith SSB (SSB_i,m-1) are generated (or , there may be an i-th offset difference (diff_timing_i) between the estimated) symbol timing offsets (Δtiming_SSBi,m-1), and the symbol timing offset generated (or estimated) using the target SSB (SSB_j,m-1). There may be a kth offset difference (diff_timing_k) between (Δtiming_SSBj,m-1) and the symbol timing offset (Δtiming_SSBk,m-1) generated (or estimated) using the kth SSB (SSB_k,m-1). there is.

The symbol timing recovery controller 132 may generate offset differences (diff_timing_i, diff_timing_k) using the generated symbol timing offsets (Δtiming_SSBj,m-1, Δtiming_SSBi,m-1, Δtiming_SSBk,m-1).

The symbol timing recovery controller 132 according to an exemplary embodiment generates (or estimates) a symbol timing offset using the target SSB received through the best reception beam in a predetermined SSB cycle and the neighbor received through the best reception beam. Offset differences between symbol timing offsets generated (or estimated) using SSBs can be generated. The symbol timing recovery controller 132 may reflect the generated offset differences in future symbol timing recovery using at least one of the neighboring SSBs. Specifically, the symbol timing recovery controller 132 generates (or estimates) alternative symbol timing recovery controllers using the neighboring SSBs (SSB_i,m, SSB_k,m) received in the mth SSB cycle of FIG. 5. , the ith offset difference (diff_freq_i) and the kth offset difference (diff_freq_k) can be applied.

Specifically, the symbol timing recovery controller 132 may apply offset differences based on Equation 3 as follows:

[Equation 4]

where

In some embodiments each If the quality of is not known, a simple arithmetic average can be calculated as shown in Equation 5 below.

[Equation 5]

When there are a plurality of neighboring SSBs (SSB_x), the symbol timing recovery controller 132 sets the symbol timing offset (Δt) corresponding to the target SSB (SSB_j,m-1) in the m-1th SSB cycle (or any SSB cycle). _{SSB _ j,m -1} ), symbol timing offset (Δt _{SSB _x,m-1 ) corresponding to the neighboring SSB (SSB_x,m-1} ), and symbol corresponding to the neighboring SSB (SSB_x,m) in the mth SSB cycle An alternative symbol timing offset (Δt _Alternate ) can be generated by calculating the timing offset (Δt _{SSB_x,m} ) based on Equation 4 or Equation 5. The symbol timing recovery controller 132 may perform symbol timing recovery based on the application result (eg, alternative symbol timing offset (Δt _Alternate )).

FIG. 14 is a block diagram showing an electronic device 1000 according to an exemplary embodiment of the present disclosure.

Referring to FIG. 14, the 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. It can be included. Here, there may be a plurality of memories 1010. A look at each component is as follows.

The memory 1010 may include a program storage unit 1011 that stores a program for controlling the operation of the electronic device and a data storage unit 1012 that stores data generated during program execution. The data storage unit 1012 may store data necessary for the operation of the application program 1013 and the reception beam selection program 1014. The program storage unit 1011 may include an application program 1013 and an AFC/STR 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 on the electronic device. That is, the application program 1013 may include instructions for an application driven by the processor 1022. As a result of the operation to update the best reception beam according to embodiments of the present disclosure, when the AFC/STR program 1014 changes from the best reception beam to another reception beam, the AFC/STR program 1014 provides at least the target SSB received in the SSB cycle corresponding to the changed time point and Automatic frequency control or symbol timing recovery for a changed receive beam can be performed by selecting any one of one neighboring SSB.

The peripheral device interface 1023 can control the connection between the input/output peripheral devices of the base station, the processor 1022, and the memory interface 1021. The processor 1022 controls the base station to provide the corresponding service using at least one software program. At this time, the processor 1022 may execute at least one program stored in the memory 1010 and provide a service corresponding to the 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, moving pictures, and still pictures. 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 selecting an electronic device to the processor unit 1020 through the input/output control unit 1040. At this time, the input device 1060 may include a keypad including at least one hardware button and a touchpad that senses touch information. For example, the input device 1060 may provide touch information such as touch, touch movement, and touch release detected through the touch pad 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. The communication processing unit 1090 may include at least one phased array, and the AFC/STR program 1014 controls the communication processing unit 1090 when performing a best reception beam update operation according to embodiments of the present disclosure. You can.

As above, exemplary embodiments are disclosed in the drawings and specifications. In this specification, embodiments have been described using specific terms, but this is only used for the purpose of explaining the technical idea of the present disclosure and is not used to limit the meaning or scope of the present disclosure as set forth in the patent claims. . Therefore, those skilled in the art will understand that various modifications and other equivalent embodiments are possible. Therefore, the true technical protection scope of the present disclosure should be determined by the technical spirit of the attached patent claims.

Claims (20)

In a method of operating a wireless communication device to correct an offset with a base station,
Changing from a first reception beam to a second reception beam within a Synchronization Signal Block (SSB) period;
determining whether to perform an offset correction operation using the first target SSB received through the second reception beam; and
The second target SSB is determined to generate a replacement offset based on the determination result, and selectively uses one of at least one first neighboring SSB received through the first reception beam. A method of operating a wireless communication device comprising performing the offset correction operation for a received beam. According to paragraph 1,
The offset correction operation includes at least one of an automatic frequency control operation and a symbol timing recovery operation,
The alternative offset includes at least one of an alternative frequency offset and an alternative symbol timing offset. According to paragraph 1,
The first reception beam is a best reception beam selected for wireless communication between the base station and the wireless communication device as a result of a beam sweeping operation,
The first target SSB is a method of operating a wireless communication device, characterized in that it corresponds to the best transmission beam of the base station determined as a pair of the first reception beams as a result of the beam sweeping operation. According to paragraph 1,
Receiving a plurality of SSBs other than the first target SSB received through the first reception beam within the SSB period;
generating reception qualities for the plurality of SSBs;
comparing the reception qualities with a reference quality; and
A method of operating a wireless communication device, further comprising determining at least one SSB having reception quality equal to or higher than the reference quality among the plurality of SSBs as the first neighboring SSB. According to paragraph 1,
The step of determining whether to perform an offset correction operation using the first target SSB includes:
generating reception quality for the first target SSB;
Comparing the reception quality with a reference quality; and
A method of operating a wireless communication device, further comprising determining the offset correction operation using the first target SSB when the reception quality is equal to or higher than the reference quality. According to clause 5,
The above standard quality is,
A method of operating a wireless communication device, characterized in that set based on the reception quality of the at least one first neighboring SSB received in the SSB cycle and the reception quality of the second target SSB received in at least one other SSB cycle. According to paragraph 1,
When the offset correction operation using the first target SSB is determined based on the determination result,
The step of performing the offset correction operation is,
Generating a first offset using the first target SSB; and
A method of operating a wireless communication device, further comprising performing the offset correction operation based on the first offset. According to paragraph 1,
When determining the offset correction operation using the at least one first neighboring SSB based on the determination result,
The step of performing the offset correction operation is,
generating the replacement offset using the at least one first neighboring SSB; and
A method of operating a wireless communication device, further comprising performing the offset correction operation based on the alternative offset. According to clause 8,
The step of generating the replacement offset is,
generating a second offset using the at least one first neighboring SSB; and
Further comprising generating the replacement offset based on the second offset and an offset difference between a second target SSB and at least one second neighboring SSB, each received through the first receive beam in at least one different SSB period. A method of operating a wireless communication device, characterized in that. According to paragraph 1,
When determining the offset correction operation using the at least one first neighboring SSB based on the determination result,
The step of performing the offset correction operation is,
generating reception quality for the at least one first neighboring SSB;
Comparing the reception quality with a reference quality; and
A method of operating a wireless communication device, further comprising skipping the offset correction operation using the first neighboring SSB for the SSB period when the reception quality is less than the reference quality. According to paragraph 1,
The step of performing the offset correction operation is,
Even when changing from the first reception beam to the second reception beam, the offset correction operation for the second reception beam is continuously performed following the offset correction operation for the first reception beam. Method of operation of a wireless communication device. A method of operating a wireless communication device that communicates with a base station through a best transmission/reception beam pair consisting of a first transmission beam and a first reception beam,
Receiving a plurality of neighboring SSBs, each transmitted from the base station through a plurality of second transmission beams other than the first transmission beam, through the first reception beam;
changing the first reception beam to a second reception beam;
Receiving a target SSB transmitted through the first transmission beam through the second reception beam; and
A method of operating a wireless communication device comprising performing automatic frequency control or symbol timing control for the second reception beam by selectively using one of the target SSB and the neighboring SSBs. According to clause 12,
A method of operating a wireless communication device, characterized in that the target SSB and the neighboring SSBs are received in the same SSB cycle. According to clause 12,
The step of performing automatic frequency control or symbol timing control for the second received beam includes:
Comparing reception quality for the target SSB and reference quality; and
When the reception quality for the target SSB is less than the reference quality, performing automatic frequency control or symbol timing control for the second reception beam using the neighboring SSBs. How it works. According to clause 14,
Performing automatic frequency control or symbol timing control for the second received beam using the neighboring SSBs includes:
selecting a neighboring SSB with the greatest reception quality among the neighboring SSBs;
generating an alternative frequency offset or an alternative symbol timing offset using the selected neighboring SSB; and
A method of operating a wireless communication device, further comprising performing the automatic frequency control or the symbol timing control based on the alternative frequency offset or the alternative symbol timing offset. According to clause 14,
Performing automatic frequency control or symbol timing control for the second received beam using the neighboring SSBs includes:
generating alternative frequency offsets or alternative symbol timing offsets using the neighboring SSBs;
calculating an average of the alternative frequency offsets or the alternative symbol timing offsets; and
A method of operating a wireless communication device, further comprising performing the automatic frequency control or the symbol timing control based on the calculated average. According to clause 14,
Further comprising generating a frequency offset difference or symbol timing offset difference between the target SSB and the neighboring SSBs using a plurality of SSBs received from the base station in a predetermined SSB period,
Performing automatic frequency control or symbol timing control for the second received beam using the neighboring SSBs includes:
generating at least one frequency offset or symbol timing offset using the neighboring SSBs; and
generating a replacement frequency offset or a replacement symbol timing offset based on the generated frequency offset or the generated symbol timing offset and the frequency offset difference or the symbol timing offset difference; and
A method of operating a wireless communication device, further comprising performing the automatic frequency control or the symbol timing control based on the alternative frequency offset or the alternative symbol timing offset. A plurality of antennas that change the first reception beam into a second reception beam and receive a radio frequency (RF) signal from the base station;
a local oscillator that generates an oscillation signal having a local oscillation frequency;
Outputting a baseband signal including a target SSB received through the first reception beam and at least one neighboring SSB received through the second reception beam from the RF signal and the oscillation signal received from the local oscillator. RF circuit; and
Determine whether to perform an automatic frequency control operation using the target SSB, and selectively use any one of the target SSB and the at least one neighboring SSB based on the determination result to determine the local oscillation frequency. A wireless communications device including a processor that performs automatic frequency control operations. According to clause 18,
The wireless communication device,
Further comprising a sampler that samples the baseband signal and outputs sampling data,
The processor,
Determine whether to perform a symbol timing recovery operation using the target SSB, and selectively use any one of the target SSB and the at least one neighboring SSB based on the determination result to recover the symbol timing for the sampler. A wireless communication device that includes a processor that performs operations. According to clause 19,
The processor,
Even at the time of changing from the first reception beam to the second reception beam, the automatic frequency control operation or the symbol timing recovery operation for the first reception beam is followed by the automatic frequency control operation or the symbol timing recovery operation for the second reception beam. A wireless communication device characterized in that it continuously performs a timing recovery operation.

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