KR20240053032A - Method and device for operating a device related to beam switching in a wireless communication system - Google Patents

Abstract

A method of operating a device related to beam switching in a wireless communication system and a device using the method are provided. The method transmits terminal capability information indicating the time required for beam switching of the terminal to the base station, receives gap-related information from the base station, communicates with the base station through a first beam, and beam switching is performed. Receive beam switching timing information indicating the timing of occurrence from the base station, and communicate with the base station through a second beam after the timing of the beam switching, wherein beam switching from the first beam to the second beam is performed. A signal received from a symbol including a beam switching gap due to is restored based on the gap-related information.

Description

Method and device for operating a device related to beam switching in a wireless communication system

This specification relates to the operation of a device during beam switching in a wireless communication system.

Methods for forming a beam in a wireless communication system largely include digital beam forming and analog beam forming, and hybrid beam forming uses a combination/combination of the two. ) There is also a method.

Analog beam forming forms a beam through phase shift or switches a phase shifter to form a desired beam, but it takes some time to form the beam. When using analog beam forming or hybrid beam forming, when switching from the first beam to the second beam, the beam switching time may be required up to 100 ns in the worst case. Within the beam switching time, distortion of the signal to be transmitted occurs.

Used in a wireless communication system, one symbol can be divided into a cyclic prefix (CP) and a valid symbol interval in the time domain. In CP, the signal of the last section of the valid symbol section can be copied and inserted. In the symbols used in existing wireless communication systems, the time length of this CP is much longer than the beam switching time, so there was no major problem during beam switching.

However, in the future 6G communication system, research is underway on THz communication using terahertz (e.g., 0.03 TeraHert (=THz) to 0.34 THz), and since the impact of phase noise is greater at such high carrier frequencies, SCS ( subcarrier spacing is also expected to become larger (e.g., 1920, 3840 kHz). Then, the length of CP can be very short, about 36ns (SCS: 1920kHz), 18ns (SCS: 3840kHz), which can be shorter than the beam switching time (100ns in the worst case). Therefore, signal distortion due to beam switching may be a problem in the 6G communication system.

The object is to provide a method of operating a device related to beam switching in a wireless communication system and a device that uses the method.

In one aspect, a method of operating a terminal related to beam switching in a wireless communication system is provided. The method transmits terminal capability information indicating the time required for beam switching of the terminal to the base station, receives gap-related information from the base station, communicates with the base station through a first beam, and beam Receive beam switching timing information indicating when switching occurs from the base station, and communicate with the base station through a second beam after the beam switching occurs. A signal received from a symbol including a beam switching gap due to beam switching is restored based on the gap-related information.

In another aspect, a terminal provided includes a transceiver, at least one memory, and at least one processor operably coupled to the at least one memory and the transceiver, wherein the processor is configured to perform beam switching of the terminal. Transmits UE capability information indicating time to the base station, receives gap-related information from the base station, communicates with the base station through the first beam, and informs when beam switching occurs. Receives beam switching timing information from the base station, and communicates with the base station through a second beam after the beam switching occurs, with a beam switching gap due to beam switching from the first beam to the second beam. The signal received from the symbol including is characterized in that it is restored based on the gap-related information.

In another aspect, an apparatus provided includes at least one memory and at least one processor operably coupled to the at least one memory, wherein the processor informs the time required for beam switching of the terminal. A beam switching point that transmits UE capability information to the base station, receives gap-related information from the base station, communicates with the base station through a first beam, and informs when beam switching occurs. A symbol that receives information from the base station and, after the point at which the beam switching occurs, communicates with the base station through a second beam, and includes a beam switching gap due to beam switching from the first beam to the second beam. The signal received is characterized in that it is restored based on the gap-related information.

Provided in another aspect, at least one computer readable medium containing instructions based on execution by at least one processor, wherein the at least one The processor transmits UE capability information indicating the time required for beam switching of the terminal to the base station, receives gap-related information from the base station, and transmits UE capability information to the base station through the first beam. Communicates with, receives beam switching time information indicating when beam switching occurs from the base station, and after the time when beam switching occurs, communicates with the base station through a second beam, and communicates with the base station in the first beam. A signal received from a symbol including a beam switching gap due to beam switching to the second beam is restored based on the gap-related information.

In another aspect, a method of operating a base station related to beam switching in a wireless communication system is provided. The method receives UE capability information (UE capability information) that informs the time required for beam switching of the terminal, transmits gap-related information to the terminal, and transmits gap-related information to the terminal through the first beam. and transmit beam switching time information indicating when beam switching occurs to the terminal, and after the time when beam switching occurs, communicate with the terminal through a second beam, and transmit the beam switching time information indicating when beam switching occurs to the terminal. A signal transmitted in a symbol including a beam switching gap due to beam switching to the second beam is characterized in that it is generated to correspond to information provided by the gap-related information.

In another aspect, a base station provided includes a transceiver, at least one memory, and at least one processor operably coupled to the at least one memory and the transceiver, wherein the processor is configured to perform the processing required for beam switching of the terminal. Receive UE capability information indicating time from the terminal, transmit gap-related information to the terminal, communicate with the terminal through the first beam, and determine when beam switching occurs. Informing the beam switching time point information is transmitted to the terminal, and after the point when the beam switching occurs, communicates with the terminal through a second beam, and beam switching due to beam switching from the first beam to the second beam A signal transmitted from a symbol including a gap is characterized in that it is generated to correspond to information provided by the gap-related information.

Through the beam switching gap, the original signal can be restored without being affected by signal distortion caused by beam switching. Additionally, using symbol-level resources as a beam switching gap results in using resources that are not distorted by beam switching as a beam switching gap, resulting in resource waste. In this disclosure, the beam switching gap is designed more flexibly to increase resource efficiency. The effects that can be achieved through specific examples of the present specification are not limited to the effects listed above. For example, there may be various technical effects that a person having ordinary skill in the related art can understand or derive from this specification. Accordingly, the specific effects of the present specification are not limited to those explicitly described in the present specification, and may include various effects that can be understood or derived from the technical features of the present specification.

Figure 1 illustrates the system structure of a next-generation radio access network (NG-RAN) to which NR is applied.
Figure 2 shows an example of a 5G usage scenario to which the technical features of this specification can be applied.
Figure 3 is a diagram showing an example of a communication structure that can be provided in a 6G system.
Figure 4 shows examples of allocating a gap during beam switching.
Figure 5 shows a method of mapping data in the frequency domain in the OFDM method and a signal after IFFT.
Figure 6 illustrates a data mapping method when the beam switching time exceeds the length of the symbol.
Figure 7 illustrates a restoration operation of the receiving end for comb type transmission.
Figure 8 is another example of the original operation of the receiving end for comb type transmission.
Figure 9 is another example of the original operation of the receiving end for comb type transmission.
Figure 10 shows an example of allocating a beam switching gap.
Figure 11 illustrates the restoration operation of the receiving end when the beam switching gap is allocated to the rear of the symbol.
Figure 12 illustrates a method of applying a beam switching gap in the DFT-s-OFDM method.
Figure 13 expresses the signal of DFT-s-OFDM considering the beam switching gap in the time domain.
Figure 14 illustrates beam switching operation for each terminal in a multiple access method using DFT-s-OFDM.
Figure 15 illustrates beam switching operation for each terminal in a multiple access method using DFT-s-OFDM.
Figure 16 illustrates operations of a base station and a terminal related to beam switching.
Figure 17 shows a method of operating a terminal related to beam switching in a wireless communication system.
Figure 18 illustrates slot settings considering the beam switching gap.
Figure 19 shows an example of dynamically changing the position of a long CP.
Figure 20 illustrates different operations of a base station and a terminal related to beam switching.
Figure 21 illustrates the communication system 1 applied herein.
22 illustrates a wireless device applicable to this specification.
Figure 23 shows another example of a wireless device that can be applied to this specification.
Figure 24 is a block diagram of an example of a processor of a terminal, according to an embodiment of the present specification.
Figure 25 illustrates operations related to beam switching from a base station perspective, according to an embodiment of the present specification.
Figure 26 is a block diagram of an example processor from a base station perspective, according to an embodiment of the present specification.

As used herein, “A or B” may mean “only A,” “only B,” or “both A and B.” In other words, as used herein, “A or B” may be interpreted as “A and/or B.” For example, as used herein, “A, B or C” refers to “only A,” “only B,” “only C,” or “any and all combinations of A, B, and C ( It can mean “any combination of A, B and C)”.

The slash (/) or comma used in this specification may mean “and/or.” For example, “A/B” can mean “A and/or B.” Accordingly, “A/B” can mean “only A,” “only B,” or “both A and B.” For example, “A, B, C” can mean “A, B, or C.”

As used herein, “at least one of A and B” may mean “only A,” “only B,” or “both A and B.” In addition, in this specification, the expression "at least one of A or B" or "at least one of A and/or B" means "at least one It can be interpreted the same as "at least one of A and B".

Additionally, as used herein, “at least one of A, B and C” means “only A”, “only B”, “only C”, or “A, B and C”. It can mean “any combination of A, B and C.” Also, “at least one of A, B or C” or “at least one of A, B and/or C” means It may mean “at least one of A, B and C.”

Additionally, parentheses used in this specification may mean “for example.” Specifically, when “control information (PDCCH)” is indicated, “PDCCH” may be proposed as an example of “control information.” In other words, “control information” in this specification is not limited to “PDCCH,” and “PDDCH” may be proposed as an example of “control information.” Additionally, even when “control information (i.e., PDCCH)” is indicated, “PDCCH” may be proposed as an example of “control information.”

Technical features described individually in one drawing in this specification may be implemented individually or simultaneously.

Hereinafter, a new radio access technology (new RAT, NR) will be described.

As more communication devices require greater communication capacity, there is a need for improved mobile broadband communication compared to existing radio access technology (RAT). Additionally, Massive Machine Type Communications (MTC), which provides various services anytime, anywhere by connecting multiple devices and objects, is also one of the major issues to be considered in next-generation communications. In addition, communication system design considering services/terminals sensitive to reliability and latency is being discussed. In this way, the introduction of next-generation wireless access technology considering expanded mobile broadband communication, massive MTC, URLLC (Ultra-Reliable and Low Latency Communication), etc. is being discussed, and in this specification, for convenience, the technology is used. is called new RAT or NR.

Figure 1 illustrates the system structure of a next-generation radio access network (NG-RAN) to which NR is applied.

Referring to FIG. 1, NG-RAN may include a gNB and/or eNB that provide user plane and control plane protocol termination to the UE. Figure 1 illustrates a case including only gNB. gNB and eNB are connected to each other through the Xn interface. gNB and eNB are connected through the 5G Core Network (5GC) and NG interface. More specifically, it is connected to the access and mobility management function (AMF) through the NG-C interface, and to the user plane function (UPF) through the NG-U interface.

Figure 2 shows an example of a 5G usage scenario to which the technical features of this specification can be applied. The 5G usage scenario shown in FIG. 2 is merely illustrative, and the technical features of this specification may also be applied to other 5G usage scenarios not shown in FIG. 2.

Referring to Figure 2, the three main requirement areas for 5G are (1) enhanced mobile broadband (eMBB) area, (2) massive machine type communication (mMTC) area, and ( 3) Includes ultra-reliable and low latency communications (URLLC) areas. Some use cases may require multiple areas for optimization, while others may focus on just one key performance indicator (KPI). 5G supports these diverse use cases in a flexible and reliable way.

Hereinafter, examples of next-generation communication (eg, 6G) that can be applied to embodiments of the present specification will be described.

<6G system general>

6G (wireless communications) systems require (i) very high data rates per device, (ii) very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) battery- The goals are to reduce the energy consumption of battery-free IoT devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be four aspects such as intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system can satisfy the requirements shown in Table 1 below. That is, Table 1 is a table showing an example of the requirements of a 6G system.

[Table 1]

The 6G system includes Enhanced mobile broadband (eMBB), Ultra-reliable low latency communications (URLLC), massive machine-type communication (mMTC), AI integrated communication, Tactile internet, High throughput, High network capacity, High energy efficiency, Low backhaul and It can have key factors such as access network congestion and enhanced data security.

Figure 3 is a diagram showing an example of a communication structure that can be provided in a 6G system.

The 6G system is expected to have simultaneous wireless communication connectivity that is 50 times higher than that of the 5G wireless communication system. URLLC, a key feature of 5G, will become an even more important technology in 6G communications by providing end-to-end delay of less than 1ms. The 6G system will have much better volumetric spectral efficiency, unlike the frequently used area spectral efficiency. 6G systems can provide ultra-long battery life and advanced battery technologies for energy harvesting, so mobile devices in 6G systems will not need to be separately charged. New network characteristics in 6G may include:

- Satellites integrated network: 6G is expected to be integrated with satellites to serve the global mobile constellation. Integration of terrestrial, satellite and aerial networks into one wireless communication system is very important for 6G.

- Connected intelligence: Unlike previous generations of wireless communication systems, 6G is revolutionary and will update the evolution of wireless from “connected things” to “connected intelligence.” AI will be used to control each step of the communication process (or signal, as described later). can be applied in each procedure of processing).

- Seamless integration wireless information and energy transfer: 6G wireless networks will deliver power to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transfer (WIET) will be integrated.

- Ubiquitous super 3D connectivity: Connectivity of drones and very low Earth orbit satellites to networks and core network functions will create super 3D connectivity in 6G ubiquitous.

In the above new network characteristics of 6G, some general requirements may be as follows.

- Small cell networks: The idea of small cell networks was introduced to improve received signal quality resulting in improved throughput, energy efficiency and spectral efficiency in cellular systems. As a result, small cell networks are an essential feature for 5G and Beyond 5G (5GB) communications systems. Therefore, the 6G communication system also adopts the characteristics of a small cell network.

- Ultra-dense heterogeneous network: Ultra-dense heterogeneous networks will be another important characteristic of the 6G communication system. Multi-tier networks comprised of heterogeneous networks improve overall QoS and reduce costs.

- High-capacity backhaul: Backhaul connections are characterized by high-capacity backhaul networks to support high-capacity traffic. High-speed fiber and free-space optics (FSO) systems may be possible solutions to this problem.

- Radar technology integrated with mobile technology: High-precision localization (or location-based services) through communication is one of the functions of the 6G wireless communication system. Therefore, radar systems will be integrated with 6G networks.

- Softwarization and virtualization: Softwarization and virtualization are two important features that are fundamental to the design process in 5GB networks to ensure flexibility, reconfigurability, and programmability. Additionally, billions of devices may be shared on a shared physical infrastructure.

The present disclosure relates to a method/procedure and an apparatus for allocating a gap during beam switching of a base station and a terminal in a communication system to alleviate signal degradation caused by beam switching.

Depending on the beam forming method, there are digital beam forming and analog beam forming, and a hybrid beam forming method that uses a mixture of the two exists.

The analog beam forming method forms a beam through phase shift or switches a phase shifter to form a desired beam, but it takes some time to form the beam. When using analog beam forming or hybrid beam forming, if the beam is switched in a different direction, the beam switching time may require up to 100 ns in the worst case.

Figure 4 shows examples of allocating a gap during beam switching.

Referring to (a) of FIG. 4, base station BS#0 may use the first beam in the DL/UL#0 resource and then use the second beam in the DL/UL#1 resource. In this way, when beam switching is performed from the first beam to the second beam, a beam switching gap may be allocated between the DL/UL#0 resource and the DL/UL#1 resource (or between the DL/UL#0 resource and the DL /UL#1 Some resources in at least one of the resources may be allocated to the beam switching gap).

Referring to (b) of FIG. 4, terminal UE#0 may use the first beam in the DL/UL#0 resource and then use the second beam in the DL/UL#1 resource. In this way, when beam switching is performed from the first beam to the second beam, a beam switching gap may be allocated between the DL/UL#0 resource and the DL/UL#1 resource (or between the DL/UL#0 resource and the DL /UL#1 Some resources in at least one of the resources may be allocated to the beam switching gap).

Large path-loss may occur in the mmWave band of the 5G NR communication system. A beam forming method can be used as one of the essential functions to compensate for this, and the need for a beam switching gap requirement when beam switching occurs in beam forming was discussed. The existing communication system adopts and uses the waveform of the CP-OFDM/CP-DFT-s-OFDM method, and the existing CP (Cyclic Prefix) length (CP) is used without guard time for beam switching time ( length alone was sufficient to cover the problem, so no degradation in performance occurred. Therefore, system design for beam switching gap is not introduced in existing standards.

The table below shows the CP length of each SCS (Sub Carrier Spacing) in the existing 5G NR communication system.

[Table 2]

As shown in the table above, even if the beam switching time required 100ns in the worst case, it was very short compared to the CP length, so the CP length alone was sufficient to cover it.

Meanwhile, in the 3GPP standard, the use of a high carrier frequency with a wider bandwidth is being considered to achieve higher transmission rates of communication systems. At such high carrier frequencies (eg, carrier frequencies above 52.6 GHz), the effect of phase noise due to RF interference increases. Larger SCSs (e.g., 480, 960 kHz) are being considered to compensate for this effect.

In the future 6G communication system, research is underway on THz communication using 0.34 THz at 0.03 TeraHert (=THz), and the SCS will also be larger because the impact of phase noise is greater at these higher carrier frequencies (e.g., 1920, 3840 kHz).

The table below illustrates the SCS and corresponding CP lengths that can be used in 6G.

[Table 3]

Increasing the SCS means that the symbol length in the time domain decreases. Therefore, as the SCS increases, the CP length decreases, and the beam switching time may be similar to or longer than the CP length. In this case, a separate beam switching gap must be considered because performance deterioration occurs.

The simplest way to solve the beam switching gap is to leave the symbol corresponding to the beam switching gap (e.g., OFDM symbol) empty between symbols in the time domain where the beam changes when beam switching occurs, which is simple from a scheduling perspective. It can be solved.

However, it cannot be assumed that the beam switching gap necessarily occurs on an OFDM symbol basis. Accordingly, spectral efficiency may decrease as even resources that are not distorted due to beam switching time are discarded in the beam switching gap. Additionally, with the development of future RF technology, the beam switching time may become less than 100 ns at most. Taking these points into consideration, it will be necessary to form a beam switching gap more flexibly rather than a beam switching gap in OFDM symbol units.

Hereinafter, the symbols/abbreviations/terms used in this specification are as follows.

CP: Cyclic Prefix, DFT-s-OFDM: Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing, DL: Downlink, ICI: Inter Carrier Interference, OFDM: Orthogonal Frequency Division Multiplexing, RE: Resource Element, RB: Resource Block, SCS : Sub Carrier Spacing, THz: TeraHertz, UL: UpLink.

In this disclosure, as a method to solve the beam switching gap, we describe a method that can be applied to each of OFDM and DFT-s-OFDM, which are waveforms applied to the 5G NR communication system, and a method that can encompass both waveforms. do.

First, a method for applying a beam switching gap in an OFDM method using an OFDM waveform is described.

Figure 5 shows a method of mapping data in the frequency domain in the OFDM method and a signal after IFFT.

Referring to FIG. 5, in the case of the OFDM method, the transmitter maps data to a sub-carrier in the frequency domain and transmits the signal through IFFT (Inverse fast Fourier transform).

Figure 5(a) shows a signal obtained by mapping data to localized REs in the frequency domain and performing IFFT. That is, data is mapped to consecutive REs and IFFT is performed.

Figures 5 (b) and (c) show signals obtained by mapping data to comb type REs and performing IFFT without allocating REs in a localized manner in the frequency domain. In this case, the signal appears as a signal repeated at different periods in the time domain according to the interval assigned to the RE in the frequency domain. For example, as shown in (b) of FIG. 5, data is mapped to one RE for every 2 REs (zeros are inserted into another RE for every 2 REs) and IFFT is performed, within 1 OFDM symbol in the time domain. A signal repeated twice appears. As shown in (c) of Figure 5, data is mapped to one RE for every 3 REs (zeros are inserted into the other two REs for every 3 REs) and IFFT is performed, within 1 OFDM symbol in the time domain. A signal repeated three times appears. That is, signals with different periods can be generated within one OFDM symbol according to the RE pattern (bit type) to which data is mapped.

These characteristics can be utilized for beam switching gap allocation and data recovery. For example, the comb type according to the beam switching gap capabilities of the base station and the terminal, the location for allocating the beam switching gap within the symbol, etc., are predetermined through at least one of an RRC message, MAC CE (control element), and DCI (downlink control information). and the base station can allocate resources to the comb type at the time beam switching occurs. Alternatively, in the case of UL where the terminal becomes a transmitter and performs beam switching, the terminal can allocate resources to the comb type.

Figure 6 illustrates a data mapping method when the beam switching time exceeds the length of the symbol.

The OFDM symbol length varies depending on the SCS, and depending on the SCS, the beam switching time may exceed the length of the OFDM symbol. For example, the beam switching time may correspond to 1 OFDM symbol + 1/2 OFDM symbol. In this case, as shown in FIG. 6, the entire first OFDM symbol 601 and the first 1/2 OFDM symbol of the second OFDM symbol 602 can be used as the beam switching gap. At this time, in the second OFDM symbol 602, only the last 1/2 OFDM symbol in the time domain can be used for data transmission, and the transmitting end maps data to the first RE for every 2 REs in the frequency domain. , resources can be allocated (data mapping) by inserting zero into the second RE for every two REs. By this method, data can be mapped and transmitted to resources that are lacking due to the beam switching gap.

Figure 7 illustrates a restoration operation of the receiving end for comb type transmission.

Depending on the beam switching gap capabilities of the base station and the terminal, the transmitting end can configure the beam switching gap and inform the terminal of the receiving operation method before beam switching occurs. For example, if the base station informs the terminal in advance of the comb type and the timing of beam switching, the receiving end (terminal) can restore the signal as shown in FIG. 7.

Specifically, when the transmitting end allocates resources (maps data) to one RE (eg, the first RE) for every two REs, the same signal is repeated twice within the OFDM symbol. When the beam switching gap is placed at the beginning of the symbol, the receiving end removes the first of the two repeated signals because distortion occurred due to the beam switching gap. Afterwards, the receiving end can restore the signal in the frequency domain by copying and pasting the contents of the second signal (701) and then performing FFT. In this way, the signal can be restored at the receiving end even from other comb types. However, when restoring a signal using the method shown in FIG. 7, the method of mapping the data at the transmitting end must be taken into account.

Figure 8 is another example of the original operation of the receiving end for comb type transmission.

For example, when the transmitter allocates resources (maps data) to one RE for every two REs, data may be mapped to the second RE rather than the first RE among the two REs. That is, in 1 RB, data can be mapped to one RE for every 2 REs starting from 1 instead of 0 based on the RE index.

In this case, it is not a structure where the signal is simply repeated twice, but the size is the same for each sample between the first and second repeated signals, but the phase is shifted by 180 degrees. In this case, the phase shift must be compensated for when copying and pasting the second signal. When restoring a comb-type signal using the copy and paste method, the RE mapping structure of the transmitting end must be taken into account.

Meanwhile, the signal may be restored at the receiving end using a method different from that in FIGS. 7 and 8.

Figure 9 is another example of the original operation of the receiving end for comb type transmission.

As shown in Figure 9, when the first signal (901) whose signal is distorted due to beam switching among the repeated signals (901 and 902) is removed and FFT (fast Fourier transform) is performed on the second repeated signal (902), in the frequency domain The signal can be restored. Because repeated signals are removed in the time domain, the power is normalized. Additionally, when a distorted signal is removed by beam switching in the time domain and an FFT is taken with the existing FFT size/interval using the second signal, the empty space nulled in the resource block at the transmitting end in the frequency domain is It disappears and the mapped RS is restored sequentially.

Figure 10 shows an example of allocating a beam switching gap.

The beam switching gap may not only be assigned/placed at the beginning of the symbol as shown in FIG. 5 described above, but may also be assigned/placed at the end (back) of the symbol as shown in FIG. 10.

Figure 11 illustrates the restoration operation of the receiving end when the beam switching gap is allocated to the rear of the symbol.

Referring to FIG. 11, the receiving end removes the rear part 112 of the symbol distorted by beam switching, copies and pastes the intact signal 111 in front of the symbol (113), and then performs FFT to restore the signal. . The operations of FIGS. 8 and 9 described above are restoration operations when the beam switching gap comes to the front part (start part) of the symbol, and when the beam switching gap comes to the back part, the signal can be restored in the same way as in FIG. 11. You can.

Next, a method for applying the beam switching gap in the DFT-s-OFDM method is explained.

Figure 12 illustrates a method of applying a beam switching gap in the DFT-s-OFDM method.

As shown in Figure 12, in the case of DFT-s-OFDM, before applying the DFT (discrete Fourier transform) spread, zero insertion is performed for a length corresponding to the gap according to the beam switching gap capabilities of the base station and the terminal. This is taken and applied at the point when beam switching occurs.

FIG. 12 shows an example of applying the beam switching gap through zero insertion when the beam switching gap is allocated to the beginning of the symbol and to the rear part of the symbol.

Similar to the OFDM method, in this method, the size and location of zero insertion in the resource allocation part must be notified to the receiving end in advance through an RRC message or DCI in order to restore the signal. Since the beam switching gap is not a changing value, if information about zero insertion allocation has already been provided, there is no need to provide this information every time beam switching occurs, and only the point in time when beam switching occurs is required.

Figure 13 expresses the signal of DFT-s-OFDM considering the beam switching gap in the time domain.

Referring to (a) of FIG. 13, when the beam switching gap 131 according to the beam switching time is shorter than the length of one symbol, zero is inserted into part of the symbol.

Referring to (b) of FIG. 13, when the beam switching gap 132 according to the beam switching time exceeds the length of one symbol 133, the symbol 133 is left blank and the next symbol ( 134), zero insertion can be performed.

Figure 14 illustrates beam switching operation for each terminal in a multiple access method using DFT-s-OFDM.

If DFT-s-OFDM is used as a multiple access method in the downlink, as shown in FIG. 14, among several terminals (e.g., UE#0, UE#1), the terminal where beam switching occurs (e.g., UE#0) Only zero insertion can be performed, and through this, spectral efficiency can be increased. If beam switching occurs during transmission and reception between terminal UE#0 and the base station, a zero insertion operation can be performed only for UE#0.

Figure 15 illustrates beam switching operation for each terminal in a multiple access method using DFT-s-OFDM.

Referring to FIG. 15, the length of the beam switching gap may use different values or the same value depending on the capabilities of the subject (eg, base station or terminal) where beam switching occurs. For example, the beam switching gap of the cell (base station) is longer than that of the terminal (case 1), the beam switching gap of the cell (base station) is shorter than the beam switching gap of the terminal (case 2), or the beam switching gap of the cell (base station) is longer than that of the terminal (case 1). The beam switching gap of the (base station) may be the same as the beam switching gap of the terminal (Case 3).

If the beam switching gap is predetermined according to system requirements, the determined value can be assigned. Afterwards, when a beam switching event occurs in the downlink between the terminal and the base station, a beam switching gap is configured at that time, and the base station can inform the terminal of the beam switching time.

If the beam switching gap is different depending on the subject (base station or terminal) where beam switching occurs, as in the case 1 or case 2 described above, when informing when beam switching occurs, the subject (base station or terminal) where beam switching occurs can also be informed. . At the point when beam switching occurs, the terminal can restore the received signal as described above, avoiding signals distorted by beam switching. When beam switching occurs in the uplink, the terminal can configure the beam switching gap in the above manner. When the base station controls beam switching, the base station can inform the terminal of the beam switching time through DCI. When the terminal performs beam switching on its own, it can transmit/inform the base station of the beam switching time through UCI, similar to the operation of the base station in the downlink.

Figure 16 illustrates operations of a base station and a terminal related to beam switching.

Referring to FIG. 16, the terminal (eg, terminal #0) may report UE capability information to the base station (S1610). For example, the terminal can inform the base station of the time required for its beam switching. However, this is only an example, and the terminal may inform the time required for its beam switching through a message other than terminal capability information.

Although not shown in FIG. 16, the terminal may receive a message (let's call this UECapabilityEnquiry) inquiring about the terminal's capabilities from the base station and report the terminal capability information in response.

Terminal capability information may be information used to convey the wireless access function of the terminal. The terminal may include only the response to the content requested by the base station in the terminal capability information, or it may include the response to the content requested by the base station and other content in the terminal capability information.

The following table is an example of terminal capability information.

[Table 4]

In the table above, 'beamswitchingtime' may be information related to the time required for beam switching of the terminal.

The base station determines the beam switching gap for subcarrier spacing (SCS) (S1620). The base station may determine the beam switching gap by considering the terminal capability information. Alternatively, the base station may determine the beam switching gap independently of the terminal capability information.

The base station transmits gap-related information for the base station and the terminal to the terminal (S1630). Gap-related information may be information related to the beam switching gap. The gap-related information serves to provide information that allows the receiving end to restore a signal received from a symbol including a beam switching gap due to beam switching from the first beam to the second beam. For example, in the case of OFDM, the comb type can be determined and informed, and in the case of DFT-s-OFDM, the zero insertion length can be informed. The receiving end can determine the size and location of the beam switching gap in the OFDM symbol through gap-related information, and can restore the signal received from the symbol including the beam switching gap without distortion based on the comb type, zero insertion length, etc. there is.

The base station and the terminal can transmit (receive) data using the first beam (S1640).

Afterwards, the occurrence of a beam switching event may be scheduled (S1650).

In this case, the base station can set comb type/zero insertion for beam switching (S1660) and inform the terminal of the beam switching time through beam switching time information (S1670). Comb type/zero insertion settings can be performed corresponding to the gap-related information. The terminal can determine the beam switching time through beam switching time information.

The terminal can identify the comb type/zero insertion after the beam switching point and restore the signal (S1680). The comb type/zero insertion can be identified based on the gap related information. The terminal restores a signal received from a symbol including a beam switching gap due to beam switching from the first beam to the second beam based on the gap-related information.

The terminal can then perform communication between the base station and the terminal using the changed beam, that is, the second beam (S1690).

Figure 17 shows a method of operating a terminal related to beam switching in a wireless communication system.

Referring to FIG. 17, the terminal transmits UE capability information indicating the time required for its beam switching to the base station (S1710). As described above, a message (UECapabilityEnquiry) inquiring about the capabilities of the terminal may be received from the base station, and the terminal capability information may be reported in response.

The terminal receives gap-related information from the base station (S1720). For example, when the OFDM method is used in the wireless communication system, the gap-related information is included in the signal received in the symbol including the beam switching gap due to beam switching from the first beam to the second beam. The data may contain information indicating the Resource Element (RE) pattern to which the data is mapped in the frequency domain. When the DFT-s-OFDM method is used in the wireless communication system, the above-described zero insertion length can be reported.

The terminal communicates with the base station through the first beam (S1730).

The terminal receives beam switching time information indicating when beam switching occurs from the base station (S1740).

After the beam switching occurs, the terminal communicates with the base station through the second beam (S1750). At this time, a signal received from a symbol including a beam switching gap due to beam switching from the first beam to the second beam can be restored based on the gap-related information.

For example, as described in FIG. 7, in a symbol including a beam switching gap due to beam switching from the first beam to the second beam, the base station uses one RE for every two REs (e.g., the first RE). If resources are allocated (data mapped) to , this RE pattern can be informed to the terminal through gap-related information. For example, gap-related information may indicate an index indicating one RE pattern among a plurality of predetermined RE patterns. When placing a beam switching gap at the beginning of a symbol, the terminal removes the first of the two signals repeated in the symbol because distortion occurred due to the beam switching gap, and copies and pastes the contents of the second signal. Then, the signal in the frequency domain can be restored by performing FFT.

Alternatively, as described in FIG. 8, in a symbol including a beam switching gap due to beam switching from the first beam to the second beam, the base station allocates resources to one RE for every two REs (mapping data ), data may be mapped to the second RE rather than the first RE in every two REs. That is, in 1 RB, data can be mapped to one RE for every 2 REs starting from 1 instead of 0 based on the RE index. In this case, rather than simply repeating the signal twice within the symbol, the size is the same for each sample between the first and second signals within the symbol, but the phase is shifted by 180 degrees. Therefore, when copying and pasting the second signal, the phase shift must be compensated for.

Alternatively, a signal received from a symbol including a beam switching gap due to beam switching from the first beam to the second beam may be restored using the method described in FIG. 9 or FIG. 11.

When the Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) method is used in the wireless communication system, the gap-related information is the signal (i.e., the signal from the first beam to the second beam). It may include information indicating the zero insertion size for a signal received from a symbol including a beam switching gap due to beam switching. The terminal can identify zero data within a symbol based on the information indicating the zero insertion size, and thus can restore the signal to its original state.

Through the beam switching gap, the original signal can be restored without being affected by signal distortion caused by beam switching. Additionally, using symbol-level resources as a beam switching gap results in using resources that are not distorted by beam switching as a beam switching gap, resulting in resource waste. In this disclosure, the beam switching gap is designed more flexibly to increase resource efficiency. The effects that can be achieved through specific examples of the present specification are not limited to the effects listed above. For example, there may be various technical effects that a person having ordinary skill in the related art can understand or derive from this specification. Accordingly, the specific effects of the present specification are not limited to those explicitly described in the present specification, and may include various effects that can be understood or derived from the technical features of the present specification.

When the OFDM method or the DFT-s-OFDM method is used in the wireless communication system, the gap-related information may include information indicating a slot setting index to be used according to the size of the beam switching gap. The terminal can identify which symbol in the slot contains the long CP based on the slot configuration index and operate accordingly.

Hereinafter, a dynamic CP design that can be applied to a waveform using CP will be described.

Figure 18 illustrates slot settings considering the beam switching gap.

Referring to FIG. 18, the length of the normal CP (180) of the existing slot format is reduced, and a separate long CP (181) for beam switching is included. Slots can be configured.

When a set of various slots is configured and beam switching occurs, the base station can inform the terminal of the slot setting index to be used according to the terminal's capabilities through an RRC message or DCI.

A long CP may be applied to the first symbol of the slot where beam switching occurs, but the position of the long CP may be dynamically changed so that beam switching can occur freely within the slot. If the receiving end is notified only when beam switching occurs, the receiving end can know that a long CP has been applied at that point, so the received signal can be properly restored.

Figure 19 shows an example of dynamically changing the position of a long CP.

Referring to FIG. 19, a long CP 191 may be applied to the fourth symbol of the slot. Here, the fourth symbol is only an example and is not limited thereto.

Figure 20 illustrates different operations of a base station and a terminal related to beam switching.

Referring to FIG. 20, the terminal (eg, terminal #0) may report UE capability information to the base station (S2010). For example, the terminal can inform the base station of the time required for its beam switching through terminal capability information. However, this is only an example, and the terminal may inform the time required for its beam switching through a message other than terminal capability information.

As described above, the terminal may receive a message (UECapabilityEnquiry) from the base station inquiring about the terminal's capabilities and report the terminal capability information in response.

Terminal capability information may be information used to convey the wireless access function of the terminal. The terminal may include only the response to the content requested by the base station in the terminal capability information, or it may include the response to the content requested by the base station and other content in the terminal capability information.

The base station determines the beam switching gap for subcarrier spacing (SCS) (S2020) and transmits a slot setting index for beam switching to the terminal (S2030). The base station may determine the slot configuration index by considering the terminal capability information.

The base station and the terminal can transmit (receive) data using the first beam (S2040).

Afterwards, the occurrence of a beam switching event may be scheduled (S2050).

In this case, the base station sets slot settings for beam switching (S2060) and transmits beam switching timing information to the terminal (S2070). The terminal can know the beam switching time through the beam switching time information.

The terminal can identify the slot setting after beam switching through the slot setting index described above and restore the signal using this (S2080).

Afterwards, the base station and the terminal can perform communication using the changed beam, that is, the second beam (S2090).

The operation of FIG. 20 can be said to be a procedure in which dynamic CP is applied to solve the time delay problem due to beam switching. The operation of FIG. 20 is similar to the operation of FIG. 16, but the difference is that, instead of the comb type/zero insertion setting for beam switching and gap-related information related thereto, the slot setting for beam switching and the slot setting index related thereto (defined slot It provides an index of one of the settings sets.

In FIGS. 16 and 20, beam switching timing information may be transmitted through an RRC message, MAC CE, or DCI.

The present disclosure seeks to solve the beam switching gap problem occurring in beyond 5G and 6G communication systems using analog beam forming or hybrid beam forming. In the case of the existing communication system, the time taken for beam switching was shorter than the CP length, so communication performance problems did not occur. Therefore, in the existing communication system, a separate system design for the beam switching gap was not included.

Meanwhile, in the THz communication system being considered in the mmWave band of 5G or 6G, the length of CP becomes very short when the SCS becomes large as in the development of conventional communication technology to reduce the impact of phase noise. Therefore, when beam switching occurs in analog beam forming or hybrid beam forming, the CP cannot cover the time required to form a new beam, ultimately distorting the signal.

Therefore, this disclosure addresses the phenomenon of signal distortion due to beam switching that occurs in future Beyond 5G and THz communication systems by allocating resources to the comb type in the frequency domain of OFDM and zero insertion in the time domain of DFT-s-OFDM. And finally, a technique for allocating slot settings using dynamic CP allows the beam switching gap to be flexibly allocated in units smaller than a symbol, thereby solving the problem of the above phenomenon. The method described in this disclosure can solve the problem of signal distortion due to beam switching while maintaining spectral efficiency as much as possible.

Figure 21 illustrates the communication system 1 applied herein.

Referring to FIG. 21, the communication system 1 applied herein includes a wireless device, a base station, and a network. Here, a wireless device refers to a device that performs communication using wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication/wireless/5G device. Although not limited thereto, wireless devices include robots (100a), vehicles (100b-1, 100b-2), XR (eXtended Reality) devices (100c), hand-held devices (100d), and home appliances (100e). ), IoT (Internet of Thing) device (100f), and AI device/server (400). For example, vehicles may include vehicles equipped with wireless communication functions, autonomous vehicles, vehicles capable of inter-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone). XR devices include AR (Augmented Reality)/VR (Virtual Reality)/MR (Mixed Reality) devices, HMD (Head-Mounted Device), HUD (Head-Up Display) installed in vehicles, televisions, smartphones, It can be implemented in the form of computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Portable devices may include smartphones, smart pads, wearable devices (e.g., smartwatches, smart glasses), and computers (e.g., laptops, etc.). Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a base station and network may also be implemented as wireless devices, and a specific wireless device 200a may operate as a base station/network node for other wireless devices.

Here, the wireless communication technology implemented in the wireless device of this specification may include Narrowband Internet of Things for low-power communication as well as LTE, NR, and 6G. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology and may be implemented in standards such as LTE Cat NB1 and/or LTE Cat NB2, and is limited to the above-mentioned names. no. Additionally or alternatively, the wireless communication technology implemented in the wireless device of the present specification may perform communication based on LTE-M technology. At this time, as an example, LTE-M technology may be an example of LPWAN technology, and may be called various names such as enhanced Machine Type Communication (eMTC). For example, LTE-M technologies include 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine. It can be implemented in at least one of various standards such as Type Communication, and/or 7) LTE M, and is not limited to the above-mentioned names. Additionally or alternatively, the wireless communication technology implemented in the wireless device of the present specification may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low-power communication. It is possible, and is not limited to the above-mentioned names. As an example, ZigBee technology can create personal area networks (PAN) related to small/low-power digital communications based on various standards such as IEEE 802.15.4, and can be called by various names.

Wireless devices 100a to 100f may be connected to the network 300 through the base station 200. AI (Artificial Intelligence) technology may be applied to wireless devices (100a to 100f), and the wireless devices (100a to 100f) may be connected to the AI server 400 through the network 300. The network 300 may be configured using a 3G network, 4G (eg, LTE) network, or 5G (eg, NR) network. Wireless devices 100a to 100f may communicate with each other through the base station 200/network 300, but may also communicate directly (e.g. sidelink communication) without going through the base station/network. For example, vehicles 100b-1 and 100b-2 may communicate directly (e.g. V2V (Vehicle to Vehicle)/V2X (Vehicle to everything) communication). Additionally, an IoT device (eg, sensor) may communicate directly with another IoT device (eg, sensor) or another wireless device (100a to 100f).

Wireless communication/connection (150a, 150b, 150c) may be established between the wireless devices (100a to 100f)/base station (200) and the base station (200)/base station (200). Here, wireless communication/connection includes various wireless connections such as uplink/downlink communication (150a), sidelink communication (150b) (or D2D communication), and inter-base station communication (150c) (e.g. relay, IAB (Integrated Access Backhaul)). This can be achieved through technology (e.g., 5G NR) through wireless communication/connection (150a, 150b, 150c), where a wireless device and a base station/wireless device, and a base station and a base station can transmit/receive wireless signals to each other. For example, the wireless communication/connection 150a, 150b, and 150c can transmit/receive signals through various physical channels, based on the various proposals of the present specification. At least some of various configuration information setting processes, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation processes, etc. may be performed.

Meanwhile, NR supports multiple numerologies (or subcarrier spacing (SCS)) to support various 5G services. For example, if SCS is 15kHz, it supports wide area in traditional cellular bands, and if SCS is 30kHz/60kHz, it supports dense-urban, lower latency. and a wider carrier bandwidth, and when SCS is 60kHz or higher, it supports a bandwidth greater than 24.25GHz to overcome phase noise.

The NR frequency band can be defined as two types of frequency ranges (FR1, FR2). The values of the frequency range may be changed. For example, the frequency ranges of the two types (FR1, FR2) may be as shown in Table 8 below. For convenience of explanation, among the frequency ranges used in the NR system, FR1 may mean "sub 6GHz range", and FR2 may mean "above 6GHz range" and may be called millimeter wave (mmW). .

[Table 5]

As mentioned above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a band of 410 MHz to 7125 MHz as shown in Table 9 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included within FR1 may include an unlicensed band. Unlicensed bands can be used for a variety of purposes, for example, for communications for vehicles (e.g., autonomous driving).

[Table 6]

Below, examples of wireless devices to which this specification applies will be described.

22 illustrates a wireless device applicable to this specification.

Referring to FIG. 22, the first wireless device 100 and the second wireless device 200 can transmit and receive wireless signals through various wireless access technologies (eg, LTE, NR). Here, {first wireless device 100, second wireless device 200} refers to {wireless device 100x, base station 200} and/or {wireless device 100x, wireless device 100x) in FIG. 21. } can be responded to.

The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and/or one or more antennas 108. Processor 102 controls memory 104 and/or transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information/signal and then transmit a wireless signal including the first information/signal through the transceiver 106. Additionally, the processor 102 may receive a wireless signal including the second information/signal through the transceiver 106 and then store information obtained from signal processing of the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, memory 104 may perform some or all of the processes controlled by processor 102 or instructions for performing the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. Software code containing them can be stored. Here, the processor 102 and memory 104 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). Transceiver 106 may be coupled to processor 102 and may transmit and/or receive wireless signals via one or more antennas 108. Transceiver 106 may include a transmitter and/or receiver. The transceiver 106 can be used interchangeably with an RF (Radio Frequency) unit. In this specification, a wireless device may mean a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and/or one or more antennas 208. Processor 202 controls memory 204 and/or transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. For example, the processor 202 may process the information in the memory 204 to generate third information/signal and then transmit a wireless signal including the third information/signal through the transceiver 206. Additionally, the processor 202 may receive a wireless signal including the fourth information/signal through the transceiver 206 and then store information obtained from signal processing of the fourth information/signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, memory 204 may perform some or all of the processes controlled by processor 202 or instructions for performing the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. Software code containing them can be stored. Here, the processor 202 and memory 204 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). Transceiver 206 may be coupled to processor 202 and may transmit and/or receive wireless signals via one or more antennas 208. Transceiver 206 may include a transmitter and/or receiver. Transceiver 206 may be used interchangeably with an RF unit. In this specification, a wireless device may mean a communication modem/circuit/chip.

Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and/or operational flow charts disclosed herein. can be created. One or more processors 102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. One or more processors 102, 202 generate signals (e.g., baseband signals) containing PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and/or methods disclosed herein. , can be provided to one or more transceivers (106, 206). One or more processors 102, 202 may receive signals (e.g., baseband signals) from one or more transceivers 106, 206, and the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. Depending on the device, PDU, SDU, message, control information, data or information can be obtained.

One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) May be included in one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document may be included in one or more processors (102, 202) or stored in one or more memories (104, 204). It may be driven by the above processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and/or sets of instructions.

One or more memories 104, 204 may be connected to one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, codes, instructions, and/or instructions. One or more memories 104, 204 may consist of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof. One or more memories 104, 204 may be located internal to and/or external to one or more processors 102, 202. Additionally, one or more memories 104, 204 may be connected to one or more processors 102, 202 through various technologies, such as wired or wireless connections.

One or more transceivers 106, 206 may transmit user data, control information, wireless signals/channels, etc. mentioned in the methods and/or operation flowcharts of this document to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals/channels, etc. referred to in the descriptions, functions, procedures, suggestions, methods and/or operational flow charts, etc. disclosed herein from one or more other devices. there is. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may transmit and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers (106, 206) may be connected to one or more antennas (108, 208), and one or more transceivers (106, 206) may be connected to the description and functions disclosed in this document through one or more antennas (108, 208). , may be set to transmit and receive user data, control information, wireless signals/channels, etc. mentioned in procedures, proposals, methods and/or operation flow charts, etc. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (eg, antenna ports). One or more transceivers (106, 206) process the received user data, control information, wireless signals/channels, etc. using one or more processors (102, 202), and convert the received wireless signals/channels, etc. from the RF band signal. It can be converted to a baseband signal. One or more transceivers (106, 206) may convert user data, control information, wireless signals/channels, etc. processed using one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers 106, 206 may comprise (analog) oscillators and/or filters.

Figure 23 shows another example of a wireless device that can be applied to this specification.

According to FIG. 23, the wireless device may include at least one processor (102, 202), at least one memory (104, 204), at least one transceiver (106, 206), and one or more antennas (108, 208). there is.

As a difference between the example of the wireless device previously described in FIG. 22 and the example of the wireless device in FIG. 23, the processors 102 and 202 and the memories 104 and 204 are separated in FIG. 22, but in the example of FIG. 23, the processor The point is that memories (104, 204) are included in (102, 202).

Here, specific descriptions of the processors 102 and 202, memories 104 and 204, transceivers 106 and 206, and one or more antennas 108 and 208 are as described above, so to avoid unnecessary repetition of description, Repeated descriptions should be omitted.

Figure 24 is a block diagram of an example of a processor of a terminal, according to an embodiment of the present specification.

Referring to FIG. 24, the processor 1600 may include a terminal capability information generator 1610, a signal restoration unit 1620, and a signal generator 1630. The terminal capability information generator 1610 may generate terminal capability information that informs the time required for beam switching of the terminal.

The signal restoration unit 1620 can restore the received signal to the original signal. In particular, a signal received from a symbol including a beam switching gap due to beam switching can be restored based on the above-described gap-related information. When the OFDM method is used in a wireless communication system, the gap-related information may include information indicating a resource element pattern in which data included in the signal is mapped in the frequency domain. When the DFT-s-OFDM method is used in a wireless communication system, the gap-related information can inform the size of zero insertion for the signal. When the OFDM method or the DFT-s-OFDM method is used in a wireless communication system, the gap-related information may include information indicating a slot setting index to be used according to the size of the beam switching gap.

The signal generator 1630 may generate data, control information, etc. to be communicated with another device, for example, a base station.

Additionally, the processor 1600 may be configured to perform an initial access operation with a base station. Additionally, the processor 1600 can control the transceiver to communicate with the base station.

Figure 25 shows operations related to beam switching from a base station perspective, according to an embodiment of the present specification.

Referring to FIG. 25, although not separately shown, the base station may perform an initial access operation with the terminal.

The base station may receive terminal capability information from the terminal indicating the time required for beam switching of the terminal (S2510).

The base station transmits gap-related information to the terminal (S2520) and communicates with the terminal through the first beam (S2530). Gap-related information may be generated based on the terminal capability information, or may be generated independently.

The base station transmits beam switching timing information indicating when beam switching occurs to the terminal (S2540), and communicates with the terminal through a second beam after the beam switching occurs (S2550). At this time, a signal transmitted in a symbol including a beam switching gap due to beam switching from the first beam to the second beam is generated to correspond to what the gap-related information indicates. That is, the signal is generated so that it can be restored at the receiving end based on the gap-related information.

Figure 26 is a block diagram of an example processor from a base station perspective, according to an embodiment of the present specification.

Referring to FIG. 26 , the processor 1700 may include a gap-related information generator 1710, a beam switching time information generator 1720, a signal restorer 1730, and a signal generator 1740. The gap-related information generator 1710 generates the above-described gap-related information, and the beam switching time information generator 1720 generates the above-described beam switching time information. The signal restoration unit 1730 restores the signal received from the terminal. The signal generator 1740 generates a signal to be transmitted to the terminal. In particular, a signal transmitted in a symbol including a beam switching gap due to beam switching from the first beam to the second beam is generated to correspond to what the gap-related information indicates.

Here, although not separately shown, the processor 1700 may be configured to perform an initial access operation with the terminal.

At least one computer readable medium (CRM) containing instructions based on execution by at least one processor, wherein the at least one processor includes: Transmits terminal capability information indicating the time required for beam switching to the base station, receives gap-related information from the base station, communicates with the base station through the first beam, and when beam switching occurs. Receive beam switching timing information indicating from the base station, and after the beam switching occurs, communicate with the base station through a second beam, wherein the beam due to beam switching from the first beam to the second beam A signal received from a symbol including a switching gap may be restored based on the gap-related information.

The claims set forth herein may be combined in various ways. For example, the technical features of the method claims of this specification may be combined to implement a device, and the technical features of the device claims of this specification may be combined to implement a method. Additionally, the technical features of the method claims of this specification and the technical features of the device claims may be combined to implement a device, and the technical features of the method claims of this specification and technical features of the device claims may be combined to implement a method.

Claims (12)

In a method of operating a terminal related to beam switching in a wireless communication system,
Transmitting UE capability information indicating the time required for beam switching of the UE to the base station;
receive gap-related information from the base station;
communicate with the base station via a first beam;
Receiving beam switching timing information indicating when beam switching occurs from the base station;
After the beam switching occurs, communicate with the base station through a second beam,
A method wherein a signal received from a symbol including a beam switching gap due to beam switching from the first beam to the second beam is restored based on the gap-related information. The method of claim 1, wherein when an Orthogonal Frequency Division Multiplexing (OFDM) method is used in the wireless communication system, the gap-related information includes a resource element pattern into which data included in the signal is mapped in the frequency domain. A method characterized by including informing information. The method of claim 1, wherein when a Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) method is used in the wireless communication system, the gap-related information includes a zero insertion size for the signal. A method characterized by informing. The method of claim 1, wherein when the OFDM method or the DFT-s-OFDM method is used in the wireless communication system, the gap-related information includes information indicating a slot setting index to be used according to the size of the beam switching gap. A method characterized by: The terminal is,
transceiver;
at least one memory; and
At least one processor operably coupled to the at least one memory and the transceiver, the processor comprising:
Transmit UE capability information indicating the time required for beam switching of the terminal to the base station, receive gap-related information from the base station, and communicate with the base station through the first beam. , Receive beam switching time information indicating when beam switching occurs from the base station, and communicate with the base station through a second beam after the time when beam switching occurs,
A terminal, characterized in that a signal received from a symbol including a beam switching gap due to beam switching from the first beam to the second beam is restored based on the gap-related information. The method of claim 5, wherein when an Orthogonal Frequency Division Multiplexing (OFDM) method is used in the wireless communication system, the gap-related information includes a resource element pattern to which data included in the signal is mapped in the frequency domain. A terminal characterized by including informing information. The method of claim 5, wherein when a Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) method is used in the wireless communication system, the gap-related information includes a zero insertion size for the signal. A terminal characterized in that it informs. The method of claim 5, wherein when the OFDM method or the DFT-s-OFDM method is used in the wireless communication system, the gap-related information includes information indicating a slot setting index to be used according to the size of the beam switching gap. A terminal characterized by: The device is,
at least one memory; and
At least one processor operably coupled to the at least one memory, the processor comprising:
Transmit UE capability information indicating the time required for beam switching of the terminal to the base station, receive gap-related information from the base station, and communicate with the base station through the first beam. , Receive beam switching time information indicating when beam switching occurs from the base station, and communicate with the base station through a second beam after the time when beam switching occurs,
A device characterized in that a signal received from a symbol including a beam switching gap due to beam switching from the first beam to the second beam is restored based on the gap-related information. At least one computer readable medium containing instructions based on execution by at least one processor, wherein the at least one processor comprises:
Transmit UE capability information indicating the time required for beam switching of the terminal to the base station, receive gap-related information from the base station, and communicate with the base station through the first beam. , Receive beam switching time information indicating when beam switching occurs from the base station, and communicate with the base station through a second beam after the time when beam switching occurs,
A recording medium, wherein a signal received from a symbol including a beam switching gap due to beam switching from the first beam to the second beam is restored based on the gap-related information. In a method of operating a base station related to beam switching in a wireless communication system,
Receiving UE capability information from the terminal indicating the time required for beam switching of the terminal;
Transmitting gap-related information to the terminal;
communicate with the terminal through a first beam;
Transmitting beam switching timing information indicating when beam switching occurs to the terminal;
After the beam switching occurs, communicate with the terminal through a second beam,
A method characterized in that a signal transmitted in a symbol including a beam switching gap due to beam switching from the first beam to the second beam is generated to correspond to information provided by the gap-related information. The base station is,
transceiver;
at least one memory; and
At least one processor operably coupled to the at least one memory and the transceiver, the processor comprising:
Receiving UE capability information from the terminal indicating the time required for beam switching of the terminal;
Transmitting gap-related information to the terminal;
communicate with the terminal through a first beam;
Transmitting beam switching timing information indicating when beam switching occurs to the terminal;
After the beam switching occurs, communicate with the terminal through a second beam,
A base station characterized in that a signal transmitted in a symbol including a beam switching gap resulting from beam switching from the first beam to the second beam is generated to correspond to information provided by the gap-related information.

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