KR20220103026A - Method and apparatus for transmitting uplink channel in a wirelss communication system - Google Patents

Abstract

The present disclosure relates to a communication technique for converging a 5G communication system with IoT technology to support a higher data transfer rate than a 4G system, and a system thereof. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security- and safety-related services, etc.) based on 5G communication technology and IoT-related technology. The present disclosure discloses a method for improving performance of simultaneous channel estimation for multiple repeated uplink transmissions and improving coverage of an uplink channel. A method for processing a control signal in a wireless communication system comprises the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing, to the base station.

Description

Method and apparatus for uplink channel transmission in a wireless communication system {METHOD AND APPARATUS FOR TRANSMITTING UPLINK CHANNEL IN A WIRELSS COMMUNICATION SYSTEM}

The present disclosure proposes a method in which a base station or a terminal transmits and receives an uplink channel in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, the 5G communication system or the pre-5G communication system is called a system after the 4G network (Beyond 4G Network) communication system or the LTE system after (Post LTE). The 5G communication system defined by 3GPP is called the New Radio (NR) system. In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the very high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna techniques have been discussed and applied to the NR system. In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network: cloud RAN), an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway. In addition, in the 5G system, the advanced coding modulation (ACM) methods FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), and advanced access technologies FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are being implemented by 5G communication technologies such as beamforming, MIMO, and array antenna. . The application of a cloud radio access network (cloud RAN) as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

With the recent development of 5G communication systems, the need for a method of repeatedly transmitting uplink in order to extend cell coverage in an ultra-high frequency (mmWave) band is emerging.

The present disclosure proposes a method and apparatus for increasing the performance of simultaneous channel estimation for repetitive uplink transmission and improving the coverage of an uplink channel in a wireless communication system.

The present invention for solving the above problems is a control signal processing method in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

According to an embodiment of the present disclosure, it is possible to increase the performance of simultaneous channel estimation for multiple uplink repeated transmission and improve the coverage of the uplink channel.

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which data or a control channel is transmitted in a 5G system.
2 is a diagram illustrating a slot structure considered in a 5G system.
3 is a diagram illustrating DMRS patterns (type1 and type2) used for communication between a base station and a terminal in a 5G system.
4 is a diagram illustrating an example of channel estimation using DMRS received in one PUSCH in a time band in a 5G system.
5 is a diagram illustrating an example of simultaneous channel estimation using DMRS received from a plurality of PUSCHs in a time band in a 5G system.
6 is a diagram illustrating an example of PUSCH repeated transmission type B in a 5G system.
7 is a diagram illustrating an example of PUSCH repeated transmission type B in a 5G system.
8 is a diagram illustrating a method of allocating resources to actual repetition consisting of one symbol when setting simultaneous channel estimation with PUSCH repetitive transmission type B. Referring to FIG.
9 is a diagram illustrating a DMRS mapping method to actual repetition consisting of one symbol when setting simultaneous channel estimation with PUSCH repetitive transmission type B. Referring to FIG.
FIG. 10 is a diagram illustrating a repeated PUSCH transmission and DMRS mapping method for actual repetition consisting of one symbol when setting simultaneous channel estimation with PUSCH repeated transmission type B. Referring to FIG.
11 is a flowchart illustrating an operation of a base station for setting resource allocation and DMRS mapping of repeated PUSCH transmission for simultaneous channel estimation.
12 is a flowchart illustrating an operation of a UE performing resource allocation and DMRS mapping of repeated PUSCH transmission for simultaneous channel estimation.
13 is a diagram illustrating a simultaneous channel estimation and DMRS mapping method when setting simultaneous channel estimation with PUSCH repetitive transmission type B. Referring to FIG.
14 is a diagram illustrating a simultaneous channel estimation and DMRS mapping method when setting simultaneous channel estimation with PUSCH repetitive transmission type B. Referring to FIG.
FIG. 15 is a diagram illustrating a DMRS mapping method when a UE is configured with PUSCH repeated transmission type B and simultaneous channel estimation from a base station.
16 is a diagram illustrating a DMRS mapping method of continuous or non-consecutive PUSCH repeated transmission when the UE receives the PUSCH repetitive transmission type B and simultaneous channel estimation from the base station.
17 is a flowchart illustrating an operation of a base station controlling simultaneous channel estimation configuration and DMRS mapping for repeated PUSCH transmission.
18 is a flowchart illustrating a DMRS mapping method of a UE in which simultaneous channel estimation for repeated PUSCH transmission is set.
19 is a flowchart illustrating an operation of a base station controlling AI-based simultaneous channel estimation and DMRS mapping.
20 is a flowchart illustrating an operation of a terminal controlling AI-based simultaneous channel estimation and DMRS mapping.
21 is a diagram illustrating a window setting method and a DMRS mapping method for performing AI-based simultaneous channel estimation during repeated PUSCH transmission in an FDD system.
22 is a diagram illustrating a window setting method and a DMRS mapping method for performing AI-based simultaneous channel estimation during repeated PUSCH transmission in a TDD system.
23 is a block diagram of a terminal according to an embodiment of the present disclosure.
24 is a block diagram of a base station according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Hereinafter, in describing the embodiments of the present disclosure, descriptions of technical contents that are well known in the technical field belonging to the present disclosure and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each figure, the same or corresponding elements are assigned the same reference numbers.

Advantages and features of the present disclosure, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments described below, but may be implemented in various different forms, and only the present embodiments allow the present disclosure to be complete, and those of ordinary skill in the art to which the present disclosure pertains. It is provided to fully inform the scope of the technical idea, and the present disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. In addition, in the description of the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

Hereinafter, the base station is a subject performing resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) is a wireless transmission path of a signal transmitted from a terminal to a flag station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, 5G mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in this, and the following 5G may be a concept including existing LTE, LTE-A and other similar services. have. In addition, the present disclosure may be applied to other communication systems through some modifications within a range that does not significantly depart from the scope of the present disclosure as judged by a person having skilled technical knowledge.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible for the instructions stored in the flowchart block(s) to produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in the blocks to occur out of order. For example, two blocks shown one after another may in fact be performed substantially simultaneously, or it is possible that the blocks are sometimes performed in the reverse order according to the corresponding function.

In this case, the term '~ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~ unit' refers to what roles carry out However, '-part' is not limited to software or hardware. '~unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, '~' denotes components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card. Also, in an embodiment, '~ unit' may include one or more processors.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Hereinafter, the method and apparatus proposed in the embodiment of the present disclosure describe the embodiment of the present disclosure as an example for improving PUSCH coverage, but are not limited to each embodiment and applied, all or part of one or more embodiments proposed in the disclosure It may be possible to use a combination of embodiments to set a frequency resource corresponding to another channel. Accordingly, the embodiments of the present disclosure may be applied through some modifications within a range that does not significantly deviate from the scope of the present disclosure as judged by a person having skilled technical knowledge.

In addition, in the description of the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

A wireless communication system, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE 802.16e, such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.

In the LTE system, which is a representative example of a broadband wireless communication system, in downlink (DL), OFDM (Orthogonal Frequency Division Multiplexing) is adopted, and in uplink (UL), SC-FDMA (Single Carrier Frequency Division Multiple Access) is used. method is being adopted. Uplink refers to a radio link in which a terminal (user equipment (UE) or mobile station (MS)) transmits data or control signals to a base station (eNode B (eNB) or base station (BS)), and downlink is a base station It refers to a radio link that transmits data or control signals to this terminal. In addition, in the above-described multiple access method, the data or control information of each user is divided by allocating and operating the time-frequency resources to which the data or control information for each user are usually carried so that the time-frequency resources do not overlap with each other, that is, orthogonality is established. make it possible

The 5G communication system, which is a communication system after LTE, must support services that simultaneously satisfy various requirements so that various requirements of users and service providers can be freely reflected. Services considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra reliability low latency communication (URLLC), etc. There is this.

eMBB aims to provide a higher data transfer rate than the data transfer rates supported by existing LTE, LTE-A or LTE-Pro. For example, in the 5G communication system, the eMBB should be able to provide a maximum data rate of 20 Gbps in the downlink and a maximum data rate of 10 Gbps in the uplink from the viewpoint of one base station. In addition, the 5G communication system must provide the maximum transmission speed and, at the same time, provide the increased user perceived data rate of the terminal. In order to satisfy such a requirement, it may be required to improve various transmission/reception technologies, including a more advanced multi-antenna (multi input multi output, MIMO) transmission technology. In addition, in the LTE system, a signal is transmitted using a transmission bandwidth of up to 20 MHz in the 2 GHz band, whereas the 5G communication system uses a frequency bandwidth wider than 20 MHz in a frequency band of 3 to 6 GHz or 6 GHz or higher, so the data transmission rate required by the 5G communication system can satisfy

At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC requires access support for large-scale terminals within a cell, improvement of coverage of terminals, improved battery life, and reduction of costs of terminals. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km ² ) within a cell. In addition, since a terminal supporting mMTC is highly likely to be located in a shaded area that a cell cannot cover, such as the basement of a building, due to the nature of the service, it requires wider coverage compared to other services provided by the 5G communication system. A terminal supporting mMTC must be composed of a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years is required.

Lastly, in the case of URLLC, it is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of a robot or machinery, industrial automation, unmaned aerial vehicle, remote health care, emergency situations A service used for an emergency alert, etc. may be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy the air interface latency of less than 0.5 milliseconds, and at the same time must satisfy the requirement of a packet error rate of 10 ^-5 or less. Therefore, for a service supporting URLLC, the 5G system must provide a smaller transmit time interval (TTI) than other services, and at the same time, allocate a wide resource in a frequency band to secure the reliability of the communication link.

The three services of the 5G communication system (hereinafter interchangeable with the 5G system), i.e., eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. In this case, different transmission/reception techniques and transmission/reception parameters may be used between services to satisfy different requirements of each service.

Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the drawings.

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain of a 5G system.

(일례로 12)개의 연속된 RE들은 하나의 자원 블록(resource block, RB, 104)을 구성할 수 있다. 또한, 시간 영역에서

개의 연속된 OFDM 심볼들은 하나의 서브프레임(subframe, 110)을 구성할 수 있다. In FIG. 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. A basic unit of a resource in the time and frequency domain is a resource element (RE, 101), and one OFDM (Orthogonal Frequency Division Multiplexing) symbol (or DFT-s-OFDM (discrete Fourier transform spread OFDM) symbol) on the time axis. It can be defined as (102) and one subcarrier (subcarrier, 103) on the frequency axis. in the frequency domain

(For example, 12) consecutive REs may constitute one resource block (resource block, RB, 104). Also, in the time domain

The consecutive OFDM symbols may constitute one subframe (subframe, 110).

2 is a diagram illustrating a slot structure considered in a 5G system.

)=14). 1개의 서브프레임(201)은 하나 또는 다수 개의 슬롯(202, 203)으로 구성될 수 있으며, 1개의 서브프레임(201)당 슬롯(202, 203)의 개수는 부반송파 간격에 대한 설정 값인 μ(204, 205)에 따라 다를 수 있다. 2 shows an example of a structure of a frame 200 , a subframe 201 , and a slot 202 . One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus, one frame 200 may consist of a total of 10 subframes 201 . In addition, one slot (202, 203) may be defined as 14 OFDM symbols (that is, the number of symbols per slot (

)=14). One subframe 201 may consist of one or a plurality of slots 202 and 203, and the number of slots 202 and 203 per one subframe 201 is μ(204), which is a set value for the subcarrier spacing. , 205).

)가 달라질 수 있고, 이에 따라 1개의 프레임 당 슬롯 수(

)가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 하기의 표 1로 정의될 수 있다.In the example of FIG. 2 , the slot structure in the case of μ=0 (204) and μ=1 (205) is shown as the subcarrier spacing setting value. When μ = 0 (204), one subframe 201 may consist of one slot 202, and when μ = 1 (205), one subframe 201 may consist of two slots ( 203) can be configured. That is, according to the set value μ for the subcarrier interval, the number of slots per subframe (

) may vary, and accordingly, the number of slots per frame (

) may be different. According to each subcarrier spacing setting μ

and

may be defined in Table 1 below.

Next, a DeModulation Reference Signal (DMRS), which is one of the reference signals in the 5G system, will be described in detail.

The DMRS may consist of several DMRS ports, and each port maintains orthogonality so as not to cause interference with each other using Code Division Multiplexing (CDM) or Frequency Division Multiplexing (FDM). However, the term for DMRS may be expressed in other terms depending on the intention of the user and the purpose of using the reference signal. More specifically, the term DMRS is merely provided for specific examples in order to easily explain the technical content of the present disclosure and to help the understanding of the present disclosure, and is not intended to limit the scope of the present disclosure. That is, it is obvious to those of ordinary skill in the art to which the present disclosure pertains that it can be implemented even with a reference signal based on the technical idea of the present disclosure.

3 is a diagram illustrating DMRS patterns (type1 and type2) used for communication between a base station and a terminal in a 5G system.

In the 5G system, two DMRS patterns may be supported. Two DMRS patterns are specifically illustrated in FIG. 3 . Referring to FIG. 3 , 301 and 302 indicate DMRS type1, where 301 indicates 1 symbol pattern and 302 indicates 2 symbol pattern. DMRS type1 of 301 and 302 of FIG. 3 is a DMRS pattern having a comb 2 structure, and may be composed of two CDM groups, and different CDM groups may be FDMed.

In the 1 symbol pattern of 301 of FIG. 3, frequency CDM is applied to the same CDM group, so that two DMRS ports can be distinguished, and thus a total of four orthogonal DMRS ports can be configured. The DMRS port ID mapped to each CDM group is shown in 301 of FIG. 3 (in the case of downlink, the DMRS port ID is indicated by adding +1000 to the illustrated number). In the 2 symbol pattern of 302 of FIG. 3, time/frequency CDM is applied to the same CDM group, so that 4 DMRS ports can be distinguished, and thus a total of 8 orthogonal DMRS ports can be configured. The DMRS port ID mapped to each CDM group is shown in 302 of FIG. 3 (in the case of downlink, the DMRS port ID is indicated by adding +1000 to the number shown).

DMRS type2 of 303 and 304 of FIG. 3 is a DMRS pattern of a structure in which FD-OCC (Frequency Domain Orthogonal Cover Codes) is applied to an adjacent subcarrier in frequency, and may be composed of three CDM groups, and different CDM groups may be FDMed can

In the 1 symbol pattern of 303 of FIG. 3, frequency CDM is applied to the same CDM group, so that two DMRS ports can be distinguished, and thus a total of six orthogonal DMRS ports can be configured. DMRS port ID mapped to each CDM group is shown in 303 of FIG. 3 (in the case of downlink, DMRS port ID is indicated by adding +1000 to the number shown). In the 2 symbol pattern of 304 of FIG. 3 , time/frequency CDM is applied to the same CDM group to distinguish 4 DMRS ports, and thus a total of 12 orthogonal DMRS ports may be configured. DMRS port ID mapped to each CDM group is shown in 304 of FIG. 3 (in the case of downlink, DMRS port ID is indicated by adding +1000 to the number shown).

As described above, in the NR system, two different DMRS patterns ((301, 302) or (303, 304) in FIG. 3) may be configured, and whether the DMRS pattern is one symbol pattern (301, 303) or adjacent It can also be set whether it is a two symbol pattern (302, 304). In addition, in the NR system, not only a DMRS port number is scheduled, but also the number of CDM groups scheduled together for PDSCH rate matching may be set and signaled. In addition, in the case of CP-OFDM (Cyclic Prefix based Orthogonal Frequency Division Multiplex), both DMRS patterns described above in the DL and UL may be supported, and in the case of Discrete Fourier Transform Spread OFDM (DFT-S-OFDM), in the UL Among the described DMRS patterns, only DMRS type1 may be supported. In addition, additional DMRS may be supported to be configurable. The front-loaded DMRS refers to the first DMRS appearing in the front symbol in time, and the additional DMRS refers to the DMRS appearing in the symbol after the front-loaded DMRS. The number of additional DMRSs in the NR system can be set from a minimum of 0 to a maximum of 3. In addition, when an additional DMRS is configured, the same pattern as the front-loaded DMRS may be assumed. More specifically, information on whether the DMRS pattern type described above for the front-loaded DMRS is type1 or type2, information on whether the DMRS pattern is a one symbol pattern or an adjacent two symbol pattern, and information on the number of CDM groups used with the DMRS port is indicated, if additional DMRS is additionally configured, it may be assumed that the same DMRS information as the front-loaded DMRS is configured for the additional DMRS.

More specifically, the downlink DMRS configuration described above may be configured through RRC signaling as shown in Table 2 below.

In addition, the uplink DMRS configuration described above may be configured through RRC signaling as shown in Table 3 below.

4 is a diagram illustrating an example of channel estimation using DMRS received in one PUSCH in a time band in a 5G system.

In performing channel estimation for data decoding using the aforementioned DMRS, channel estimation may be performed in a PRG (Precoding Resource Block Group), which is a corresponding bundling unit, using PRB bundling linked to a system band in a frequency band. . In addition, in a time unit, it is assumed that precoding is the same only for DMRSs received in one PUSCH, and the channel is estimated.

5 is a diagram illustrating an example of joint channel estimation using DMRS received from a plurality of PUSCHs in a time band in a 5G system.

In the 5G system, a base station may decode data of a plurality of PUSCHs by simultaneously estimating channels using DMRSs received from a plurality of PUSCHs in a time band. In order to perform simultaneous channel estimation on the repeated PUSCH transmissions received by the base station, the UE has the constancy (or consistency) and phase continuity of PUSCH transmission power between repeated PUSCH transmissions for which simultaneous channel estimation is to be performed. may be maintained, and also, PUSCH repeated transmission may be configured through a beam having the same precoding. The base station performs upper layer signaling (eg, PUSCH-Config of RRC, PUSCH-TimeDomainResourceAllocation, etc.) and L1 signaling (eg, DCI format 0_0 and DCI format 0_1, etc.), it is possible to configure simultaneous channel estimation including constancy (or consistency) of PUSCH transmission power, continuity of phase, and beam configuration having the same precoding to the UE.

For example, a separate parameter for controlling simultaneous channel estimation (for example, pusch-numberofRepetitionsForJointCE, etc.) is included in PUSCH-Config or PUSCH-TimeDomainResourceAllocation, or by configuring a separate RRC message for setting simultaneous channel estimation The number of a plurality of PUSCHs for estimating channels or a resource allocation method may be configured at the same time. Alternatively, the number of a plurality of PUSCHs for estimating channels at the same time through DCI format 0_0 or DCI format 0_1 or the like or resource allocation for transmission of a plurality of PUSCHs may be dynamically controlled. Alternatively, simultaneous channel estimation may be configured through a combination of the above-described higher layer signaling and L1 signaling.

Through the always-described configuration method, the UE may transmit a plurality of PUSCHs for simultaneous channel estimation. Referring to FIG. 5 as in FIG. 4, in the channel estimation for data decoding using the DMRS that satisfies the above conditions, in the frequency band, PRB bundling linked to the system band is used to determine the bundling unit, PRG (Precoding Resource Block). In the group), channel estimation may be performed. Additionally, the base station may simultaneously estimate the channel by using the DMRS received in one or more PUSCHs in a specific time unit. Through this, since channel estimation is possible based on multiple DMRSs of a plurality of PUSCHs in a time band, channel estimation performance may be improved. In particular, in order to improve coverage, even if data decoding performance is good, channel estimation performance may become a bottleneck, so the channel estimation performance may be very important.

Hereinafter, a method of allocating time domain resources for a data channel in a 5G communication system will be described. The base station provides a table for time domain resource allocation information for a downlink data channel (Physical Downlink Shared Channel; PDSCH) and an uplink data channel (Physical Uplink Shared Channel; PUSCH) to the terminal, and higher layer signaling (e.g. For example, RRC signaling) can be set.

The base station may set a table consisting of a maximum of maxNrofDL-Allocations = 16 entries for the PDSCH, and may set a table consisting of a maximum of maxNrofUL-Allocations = 16 entries for the PUSCH. In the time domain resource allocation information, for example, PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted by K0) or PDCCH-to-PUSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted by K2), the PDSCH or PUSCH is scheduled in the slot Information on the position and length of the start symbol, a mapping type of PDSCH or PUSCH, etc. may be included. For example, time domain resource allocation information for the PDSCH may be configured to the UE through an RRC signal as shown in Table 4 below.

Also, for example, time domain resource allocation information for PUSCH may be configured to the UE through an RRC signal as shown in Table 5 below.

The base station may transmit one of the entries of the table for the time domain resource allocation information to the terminal through L1 signaling (eg, downlink control information (DCI)) (eg, the 'time domain in DCI'). resource allocation' field). The UE may acquire time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

Hereinafter, transmission of an uplink data channel (Physical Uplink Shared Channel; PUSCH) in a 5G system will be described in detail. PUSCH transmission may be dynamically scheduled by a UL grant in DCI or may be operated by a configured grant Type 1 or Type 2. Dynamic scheduling for PUSCH transmission may be indicated, for example, in DCI format 0_0 or 0_1.

The Configured grant Type 1 PUSCH transmission does not receive the UL grant in DCI, but through the reception of configuredGrantConfig including the rrc-ConfiguredUplinkGrant of [Table 6] through higher signaling (semi-static) Can be configured. . Configured grant Type 2 PUSCH transmission may be semi-continuously scheduled by the UL grant in DCI after reception of configuredGrantConfig that does not include the rrc-ConfiguredUplinkGrant of [Table 6] through upper signaling. When PUSCH transmission is operated by a configured grant, parameters applied to PUSCH transmission are specific parameters provided by pusch-Config of [Table 7], which is higher signaling (eg, dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, scaling of UCI) -OnPUSCH, etc.) can be applied through configuredGrantConfig, which is the upper signaling of [Table 6]. For example, if the terminal is provided with the transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 6], the terminal can apply tp-pi2BPSK in the pusch-Config of [Table 7] for PUSCH transmission operated by the configured grant. .

Next, a PUSCH transmission method will be described. The DMRS antenna port for PUSCH transmission may be the same as the antenna port for SRS transmission. PUSCH transmission may follow a codebook-based transmission method and a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in pusch-Config of [Table 7], which is higher signaling, is 'codebook' or 'nonCodebook'. As described above, PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1, and may be semi-statically configured by a configured grant.

If the UE is instructed to schedule PUSCH transmission through DCI format 0_0, the UE has a minimum ID (lowest ID) within an uplink partial bandwidth (BWP) activated in the serving cell (UE). -specific, dedicated) Beam configuration for PUSCH transmission may be performed using the pucch-spatialRelationInfoID corresponding to the PUCCH resource. In this case, PUSCH transmission may be performed based on a single antenna port. The UE may not expect scheduling for PUSCH transmission through DCI format 0_0 within the BWP in which the PUCCH resource including the pucch-spatialRelationInfo is not configured. If the UE has not configured txConfig in pusch-Config of [Table 7], the UE may not expect to be scheduled in DCI format 0_1.

Next, codebook-based PUSCH transmission will be described. Codebook-based PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1, and may operate semi-statically by a configured grant. If it is dynamically scheduled by the codebook-based PUSCH DCI format 0_1 or is set semi-statically by a configured grant, the UE SRS Resource Indicator (SRI), TPMI (transmission precoding matrix indicator), and transmission rank (the number of PUSCH transport layers) ), a precoder for PUSCH transmission may be determined.

At this time, the SRI may be given through a field SRS resource indicator in DCI or may be configured through srs-ResourceIndicator, which is higher signaling. The UE may be configured with at least one SRS resource when transmitting the codebook-based PUSCH, for example, may be configured with up to two. When the UE is provided with an SRI through DCI, the SRS resource indicated by the corresponding SRI may mean an SRS resoucre corresponding to the SRI among SRS resources transmitted before the PDCCH including the corresponding SRI. In addition, TPMI and transmission rank may be given through fields precoding information and number of layers in DCI or may be set through higher signaling, precodingAndNumberOfLayers. The TPMI may be used to indicate a precoder applied to PUSCH transmission.

A precoder to be used for PUSCH transmission may be selected from an uplink codebook having the same number of antenna ports as the value of nrofSRS-Ports in SRS-Config, which is higher signaling. In the codebook-based PUSCH transmission, the UE may determine the codebook subset based on the TPMI and the codebookSubset in the higher signaling, pusch-Config. In this case, the codebookSubset in the higher signaling pusch-Config may be set to one of 'fullyAndPartialAndNonCoherent', 'partialAndNonCoherent', or 'nonCoherent' based on the UE capability reported by the UE to the base station.

If the UE reports 'partialAndNonCoherent' as UE capability, the UE may not expect that the value of codebookSubset, which is higher level signaling, is set to 'fullyAndPartialAndNonCoherent'. In addition, if the UE reports 'nonCoherent' as UE capability, the UE may not expect that the value of codebookSubset, which is higher signaling, is set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. When nrofSRS-Ports in SRS-ResourceSet, which is higher signaling, points to two SRS antenna ports, the UE may not expect that the value of codebookSubset, which is upper signaling, is set to 'partialAndNonCoherent'.

The terminal may receive one SRS resource set in which the value of usage in the upper signaling SRS-ResourceSet is set to 'codebook', and one SRS resource in the corresponding SRS resource set may be indicated through SRI. If several SRS resources are set in the SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the terminal sets the value of nrofSRS-Ports in the upper signaling SRS-Resource to the same value for all SRS resources It can be expected that this will be set.

The terminal transmits one or a plurality of SRS resources included in the SRS resource set in which the usage value is set as 'codebook' to the base station according to higher level signaling, and the base station selects one of the SRS resources transmitted by the terminal and selects the corresponding SRS By using the transmission beam information of the resource, it is possible to instruct the UE to perform PUSCH transmission. In this case, in codebook-based PUSCH transmission, SRI is used as information for selecting an index of one SRS resource and may be included in DCI. Additionally, the base station may transmit information indicating the TPMI and rank to be used by the terminal for PUSCH transmission in the DCI. The UE may perform PUSCH transmission by applying the TPMI indicated based on the transmission beam of the corresponding SRS resource and the precoder indicated by the rank by using the SRS resource indicated by the SRI.

Next, non-codebook-based PUSCH transmission will be described. Non-codebook-based PUSCH transmission may be dynamically scheduled through DCI format 0_0 or 0_1, or may operate semi-statically by a configured grant. When at least one SRS resource is set in the SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE can receive a non-codebook-based PUSCH transmission schedule through DCI format 0_1.

For the SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE may receive an NZP (non-zero power) CSI-RS resource associated with one SRS resource set. The UE may perform the calculation of the precoder for SRS transmission by measuring the NZP CSI-RS resource configured in association with the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource associated with the SRS resource set and the first symbol of aperiodic SRS transmission in the terminal is less than a specific symbol (eg, 42 symbols), the terminal is SRS Information on the precoder for transmission may not be expected to be updated.

When the value of resourceType in the upper signaling SRS-ResourceSet is set to 'aperiodic', the NZP CSI-RS associated with the SRS-ResourceSet may be indicated by the SRS request, which is a field in DCI format 0_1 or 1_1. At this time, if the NZP CSI-RS resource associated with the SRS-ResourceSet is an aperiodic NZP CSI resource, and the value of the field SRS request in DCI format 0_1 or 1_1 is not '00', the NZP CSI associated with the SRS-ResourceSet It may indicate that -RS exists. In this case, the DCI should not indicate cross carrier or cross BWP scheduling. In addition, if the value of the SRS request indicates the existence of the NZP CSI-RS, the corresponding NZP CSI-RS may be located in the slot in which the PDCCH including the SRS request field is transmitted. In this case, the TCI states set for the scheduled subcarrier may not be set to QCL-TypeD.

If a periodic or semi-persistent SRS resource set is configured, the NZP CSI-RS associated with the SRS resource set may be indicated through the associatedCSI-RS in the SRS-ResourceSet, which is higher signaling. For non-codebook-based transmission, the UE may not expect that spatialRelationInfo, which is upper signaling for SRS resource, and associatedCSI-RS in SRS-ResourceSet, which is higher signaling, are set together.

When a plurality of SRS resources are configured, the UE may determine a precoder to be applied to PUSCH transmission and a transmission rank based on the SRI indicated by the base station. In this case, the SRI may be indicated through a field SRS resource indicator in DCI or may be configured through srs-ResourceIndicator, which is higher level signaling. As with the above-described codebook-based PUSCH transmission, when the UE is provided with an SRI through DCI, the SRS resource indicated by the SRI is an SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH including the SRI. can mean The terminal can use one or a plurality of SRS resources for SRS transmission, and the maximum number of SRS resources and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol in one SRS resource set are determined by the UE capability reported by the terminal to the base station. can be decided. In this case, SRS resources simultaneously transmitted by the UE may occupy the same RB. The UE may configure one SRS port for each SRS resource. Only one SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook' can be set, and up to four SRS resources for non-codebook-based PUSCH transmission can be set.

The base station transmits one NZP CSI-RS associated with the SRS resource set to the terminal, and the terminal transmits one or a plurality of SRS resources in the corresponding SRS resource set based on the measurement result when receiving the corresponding NZP CSI-RS. You can calculate which precoder to use. When the terminal transmits one or a plurality of SRS resources in the SRS resource set in which usage is set to 'nonCodebook' to the base station, the calculated precoder is applied, and the base station applies one or more of the received one or a plurality of SRS resources SRS resource can be selected. In this case, in non-codebook-based PUSCH transmission, the SRI indicates an index capable of expressing one or a combination of a plurality of SRS resources, and the SRI may be included in the DCI. In this case, the number of SRS resources indicated by the SRI transmitted by the base station may be the number of transmission layers of the PUSCH, and the UE may transmit the PUSCH by applying a precoder applied to SRS resource transmission to each layer.

Next, PUSCH repeated transmission will be described. When the UE is scheduled for PUSCH transmission in DCI format 0_1 in the PDCCH including the CRC scrambled with C-RNTI, MCS-C-RNTI, or CS-RNTI, if the UE has set the upper layer signaling pusch-AggregationFactor, pusch- The same symbol allocation is applied in consecutive slots equal to the AggregationFactor, and PUSCH transmission may be limited to single rank transmission. For example, the UE should repeat the same transport block (TB) in consecutive slots as many as pusch-AggregationFactor, and apply the same symbol allocation to each slot. [Table 8] shows a redundancy version applied to repeated PUSCH transmission for each slot. If the UE is scheduled for repeated PUSCH transmission in DCI format 0_1 in a plurality of slots, at least among the slots in which PUSCH repeated transmission is performed according to information of higher layer signaling tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated If one symbol is indicated as a downlink symbol, the UE may not perform PUSCH transmission in a slot in which the corresponding symbol is located.

Hereinafter, repeated transmission of an uplink data channel (PUSCH) in a 5G system will be described in detail. In the 5G system, two types of repetitive transmission methods of the uplink data channel are supported: PUSCH repetitive transmission type A and PUSCH repetitive transmission type B. The UE may receive one of PUSCH repeated transmission types A or B configured by higher layer signaling.

PUSCH repeated transmission type A

- As described above, the start symbol and length of the uplink data channel are determined by the time domain resource allocation method in one slot, and the base station sets the number of repeated transmissions by higher layer signaling (eg, RRC signaling) or L1 signaling (eg, For example, it can be transmitted to the UE through DCI).

- The terminal may repeatedly transmit an uplink data channel having the same start symbol and length as the uplink data channel configured above in consecutive slots based on the number of repeated transmissions received from the base station. At this time, if at least one symbol among the symbols in the slot configured for the downlink by the base station to the terminal or the symbols in the slot for repetitive uplink data channel repeated transmission configured by the terminal is set to the downlink, the terminal performs the uplink in the corresponding slot. Link data channel transmission may be omitted. That is, although it is included in the number of repeated transmissions of the uplink data channel, it may not be transmitted.

PUSCH repeated transmission type B

- As described above, the start symbol and length of the uplink data channel are determined by the time domain resource allocation method in one slot, and the base station sets the number of repeated transmissions numberofrepetitions in upper signaling (eg, RRC signaling) or L1 signaling (eg For example, it can be transmitted to the UE through DCI).

에 의해 주어지고 상기 시작 슬롯에서 nominal repetition이 시작하는 심볼은

에 의해 주어질 수 있다. n번째 nominal repetition이 끝나는 슬롯은

에 의해 주어지고 상기 마지막 슬롯에서 nominal repetition이 끝나는 심볼은

에 의해 주어질 수 있다. 여기서 n=0,…, numberofrepetitions-1 이고, S는 설정 받은 상향링크 데이터 채널의 시작 심볼을 나타내고, L은 설정 받은 상향링크 데이터 채널의 심볼 길이를 나타낼 수 있다.

는 PUSCH 전송이 시작하는 슬롯을 나타내고

는 슬롯 당 심볼의 수를 나타낼 수 있다. - First, the nominal repetition of the uplink data channel may be determined as follows based on the start symbol and length of the uplink data channel set above. Here, nominal repetition may mean a resource of a symbol set by the base station for repeated PUSCH transmission, and the terminal may determine a resource usable for uplink in the set nominal repetition. in this case, The slot where the nth nominal repetition begins is

is given by and the symbol at which nominal repetition starts in the starting slot is

can be given by The slot where the nth nominal repetition ends is

The symbol given by and where the nominal repetition ends in the last slot is

can be given by where n=0,… , numberofrepetitions -1, S may represent a start symbol of a configured uplink data channel, and L may represent a symbol length of a configured uplink data channel.

denotes a slot in which PUSCH transmission starts

may represent the number of symbols per slot.

- The UE determines an invalid symbol for PUSCH repeated transmission type B. by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated A symbol configured for downlink may be determined as an invalid symbol for PUSCH repeated transmission type B. Additionally, an invalid symbol may be set based on a higher layer parameter (eg, InvalidSymbolPattern ). As an example, the upper layer parameter (eg, InvalidSymbolPattern ) may set an invalid symbol by providing a symbol-level bitmap spanning one slot or two slots. In this case, the 1 in the bitmap may indicate an invalid symbol. Additionally, the period and pattern of the bitmap may be set through a higher layer parameter (eg, periodicityAndPattern ). If a higher layer parameter (eg, InvalidSymbolPattern ) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1, the terminal applies an invalid symbol pattern. If it indicates 0, the terminal may not apply the invalid symbol pattern. Alternatively, if a higher layer parameter (eg, InvalidSymbolPattern ) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter is not set, the terminal may apply an invalid symbol pattern.

- After the invalid symbol is determined in each nominal repetition, the terminal may consider symbols other than the determined invalid symbol as valid symbols. If more than one valid symbol is included in each nominal repetition, the nominal repetition may contain one or more actual repetitions. Here, each actual repetition means a symbol actually used for PUSCH repeated transmission among the symbols set as the set nominal repetition, and may include a continuous set of valid symbols that can be used for PUSCH repeated transmission type B in one slot. have. The terminal may omit transmission of the actual repetition when the actual repetition with one symbol is set to valid except for the case where the symbol length L=1 of the configured uplink data channel. The redundancy version is applied according to the redundancy version pattern set for each nth actual repetition.

6 is a diagram illustrating an example of PUSCH repeated transmission type B in a 5G system.

When the terminal receives the start symbol S of the uplink data channel set to 10, the length L is set to 6, and the number of repeated transmissions is set to 3, nominal repetition may appear in two consecutive slots (601). In order to determine the invalid symbol, the terminal may determine the symbol set as the downlink symbol in each nominal repetition as the invalid symbol, and determine the symbols set to 1 in the invalid symbol pattern 602 as the invalid symbol. In each nominal repetition, when valid symbols other than invalid symbols consist of one or more consecutive symbols in one slot, the terminal may set actual repetition consisting of one or more consecutive symbols in the one slot ( 603).

Hereinafter, frequency hopping of an uplink data channel (Physical Uplink Shared Channel; PUSCH) in a 5G system will be described in detail.

In 5G, as a frequency hopping method of an uplink data channel, two methods are supported for each PUSCH repetition transmission type. First, the repeated PUSCH transmission type A may support intra-slot frequency hopping and inter-slot frequency hopping, and the PUSCH repetitive transmission type B may support inter-repetition frequency hopping and inter-slot frequency hopping.

The intra-slot frequency hopping method supported by the PUSCH repeated transmission type A is a method in which the terminal changes and transmits the allocated resources of the frequency domain by a set frequency offset in two hops within one slot. In intra-slot frequency hopping, the start RB of each hop can be expressed through Equation 1.

는 UL BWP안에서 시작 RB를 나타내고 주파수 자원 할당 방법으로부터 계산될 수 있다.

은 상위 계층 파라미터를 통해 두 개의 홉 사이에 주파수 오프셋을 나타난다. 첫 번째 홉의 심볼 수는

로 나타낼 수 있고, 두 번째 홉의 심볼 수는

으로 나타낼 수 있다.

은 한 슬롯 내에서의 PUSCH 전송의 길이로, OFDM 심볼 수로 나타낼 수 있다. In Equation 1, i = 0 and i = 1 represent the first hop and the second hop, respectively,

denotes the start RB in the UL BWP and can be calculated from the frequency resource allocation method.

indicates the frequency offset between the two hops through the upper layer parameter. The number of symbols in the first hop is

can be expressed as , and the number of symbols in the second hop is

can be expressed as

is the length of PUSCH transmission in one slot, and may be represented by the number of OFDM symbols.

슬롯 동안 시작 RB는 수학식 2를 통해 나타낼 수 있다.Next, the inter-slot frequency hopping method supported by the PUSCH repeated transmission types A and B is a method in which the UE changes the allocated resources of the frequency domain for each slot by a set frequency offset and transmits them. In inter-slot frequency hopping

The starting RB during the slot may be expressed through Equation (2).

는 multi-slot PUSCH 전송에서 현재 슬롯 번호,

는 UL BWP안에서 시작 RB를 나타내고 주파수 자원 할당 방법으로부터 계산될 수 있다.

은 상위 계층 파라미터를 통해 두 개의 홉 사이에 주파수 오프셋을 나타낼 수 있다.In Equation 2,

is the current slot number in multi-slot PUSCH transmission,

denotes the start RB in the UL BWP and can be calculated from the frequency resource allocation method.

may indicate a frequency offset between two hops through a higher layer parameter.

Next, the inter-repetition frequency hopping method supported by the PUSCH repetitive transmission type B is to transmit a resource allocated in the frequency domain for one or a plurality of actual repetitions within each nominal repetition by moving a set frequency offset. RBstart(n), which is the index of the start RB on the frequency domain for one or a plurality of actual repetitions within the nth nominal repetition, may follow Equation 3 below.

은 상위 계층 파라미터를 통해 두 개의 홉 사이에 RB 오프셋을 나타낼 수 있다.In Equation 6, n is the index of nominal repetition,

may indicate the RB offset between two hops through a higher layer parameter.

The present disclosure describes a resource allocation method and a DMRS mapping method when PUSCH repeated transmission configuration and joint channel estimation are configured in a 5G communication system. Simultaneous channel estimation for multiple PUSCH repeated transmission according to an embodiment of the present disclosure may be used to improve channel estimation performance and improve channel coverage.

According to an embodiment of the present disclosure, based on a repeatedly transmitted Physical Uplink Shared Channel (PUSCH), a method of operating a terminal for improving joint channel estimation performance for multiple PUSCH repeated transmissions is provided from a base station , receiving repetitive transmission configuration information and simultaneous channel estimation configuration information for repeatedly transmitting PUSCH; receiving, from the base station, PUSCH resource allocation configuration information and DMRS (DeModulation Reference Signal) configuration information for estimating a channel; To the base station, based on the configured resource allocation information and the configured DMRS configuration information, resource allocation according to the configured resource allocation and DMRS mapping method for repeated transmission of a PUSCH to be concurrent channel estimation, and repeating transmission while performing DMRS mapping. may include

According to an embodiment of the present disclosure, a method of operating a base station for improving joint channel estimation performance for repeated multi-PUSCH transmission based on a repeatedly transmitted PUSCH is provided for repeatedly transmitting a PUSCH to a UE. transmitting repetitive transmission configuration information and simultaneous channel estimation configuration information; transmitting, to the UE, PUSCH resource allocation configuration information and DMRS configuration information for estimating a channel; receiving, from the terminal, the PUSCH repeatedly transmitted based on the resource allocation configuration information and the DMRS configuration information; and simultaneous channel estimation for the received multiple PUSCH repeated transmissions.

According to the present disclosure, a resource allocation method and a DMRS mapping method when setting simultaneous channel estimation for repeated PUSCH transmission will be described through embodiments.

This embodiment provides a resource allocation method and a DMRS mapping method when setting simultaneous channel estimation for repeated PUSCH transmission in a 5G system. The resource allocation and DMRS mapping method according to an embodiment of the present disclosure may be applied to improve uplink coverage through precise channel estimation. Hereinafter, repeated PUSCH transmission has been described as an example in describing the overall embodiments of the present disclosure, but this is only for illustration and does not limit the scope of the present disclosure, and PUSCH/PUCCH through predefined/set or signaling between a base station and a terminal It goes without saying that the embodiment according to the present disclosure may be applied even in the case of repeated transmission. In addition, an arbitrary value defined/set in advance in a method for resource allocation and DMRS mapping applied to PUSCH repeated transmission in which simultaneous channel estimation is set, which will be described below through this specification, or set through signaling between a base station and a terminal, is a symbol/slot The length, the interval between PUSCH/PUCCH transmissions, the number of PUSCH/PUCCH transmissions, etc. may be set to one or a combination thereof.

<First embodiment>

A first embodiment of the present disclosure provides a resource allocation method for repeated PUSCH transmission in which simultaneous channel estimation for repeated PUSCH transmission is configured.

7 is a diagram illustrating an example of PUSCH repeated transmission type B in a 5G system.

When the terminal receives the start symbol S of the uplink data channel set to 10, the length L is set to 9, and the number of repeated transmissions is set to 2, nominal repetition may appear in two consecutive slots (701). In order to determine the invalid symbol, the terminal may determine the symbol set as the downlink symbol in each nominal repetition as the invalid symbol, and determine the symbols set to 1 in the invalid symbol pattern 702 as the invalid symbol. In each nominal repetition, when valid symbols, not invalid symbols, consist of one or more consecutive symbols in one slot, the terminal may set actual repetition consisting of one or more consecutive symbols in the one slot ( 703). The terminal may omit the actual repetition 704 composed of the one symbol. The present disclosure proposes a method of using the actual repetition 704 composed of the one omitted symbol as PUSCH repeated transmission and DMRS when setting simultaneous channel estimation. According to the method proposed in the present disclosure, it is possible to improve the coverage of a channel through an energy gain of a channel and a precise channel estimation.

[Method 1]

In method 1, when the UE receives the PUSCH repetition transmission type B and simultaneous channel estimation, a method of setting and transmitting the repeated PUSCH transmission in actual repetition consisting of one symbol is proposed.

8 is a diagram illustrating a method of allocating resources to actual repetition consisting of one symbol when setting simultaneous channel estimation with PUSCH repetitive transmission type B. Referring to FIG.

8 shows that when the terminal receives the start symbol S of the uplink data channel set to 10, the length L is set to 9, and the number of repeated transmissions is set to 2, nominal repetition may appear in two consecutive slots (801). ). In order to determine the invalid symbol, the terminal may determine the symbol set as the downlink symbol in each nominal repetition as the invalid symbol, and determine the symbols set to 1 in the invalid symbol pattern 802 as the invalid symbol. In each nominal repetition, valid symbols, not invalid symbols, may set actual repetition in one slot (803). When estimating the simultaneous channel in the actual repetition, the actual repetition having one symbol may be allocated and transmitted by resource allocation as the actual repetition 804 without omitting the actual repetition. At this time, the redundancy version may be mapped in consideration of each nth actual repetition to the actual repetition composed of one symbol ( 805 ). As another method, the actual repetition composed of one symbol may be mapped according to the redundancy version of the closest actual repetition in which the simultaneous channel estimation is made ( 806 ). If the actual repetition consisting of one symbol is used as the PUSCH repetition transmission through the method of the present invention, the channel coverage can be improved by obtaining an energy gain of the channel.

[Method 2]

Method 2 proposes a method for transmitting by setting DMRS mapping to actual repetition consisting of one symbol when the UE receives the PUSCH repetition transmission type B and simultaneous channel estimation set.

9 is a diagram illustrating a DMRS mapping method to actual repetition consisting of one symbol when setting simultaneous channel estimation with PUSCH repetitive transmission type B. Referring to FIG.

9 shows that when the terminal receives the start symbol S of the uplink data channel set to 10, the length L is set to 9, and the number of repeated transmissions is set to 2, nominal repetition may appear in two consecutive slots (901). ). In order to determine the invalid symbol, the terminal may determine the symbol set as the downlink symbol in each nominal repetition as the invalid symbol, and determine the symbols set to 1 in the invalid symbol pattern 902 as the invalid symbol. In each nominal repetition, valid symbols, not invalid symbols, may set the actual repetition in one slot (903). When estimating the simultaneous channel for the actual repetition, the DMRS may be mapped and transmitted without omitting the actual repetition having one symbol (904). When the actual repetition composed of one symbol is transmitted to the DMRS through the method of the present invention, the coverage of the channel can be improved by estimating a more precise channel.

[Method 3]

Method 3 proposes a method of transmitting by setting repeated PUSCH transmission and DMRS mapping to actual repetition consisting of one symbol when the UE receives the PUSCH repeated transmission type B and simultaneous channel estimation set.

FIG. 10 is a diagram illustrating a repeated PUSCH transmission and DMRS mapping method for actual repetition consisting of one symbol when setting simultaneous channel estimation with PUSCH repeated transmission type B. Referring to FIG.

10 shows that when the terminal receives the start symbol S of the uplink data channel set to 10, the length L is set to 9, and the number of repeated transmissions is set to 2, nominal repetition may appear in two consecutive slots (1001). ). In order to determine the invalid symbol, the terminal may determine the symbol set as the downlink symbol in each nominal repetition as the invalid symbol, and determine the symbols set to 1 in the invalid symbol pattern 1002 as the invalid symbol. In each nominal repetition, valid symbols, not invalid symbols, may set actual repetition in one slot (1003). When estimating the simultaneous channel for the actual repetition, the repeated PUSCH transmission and the DMRS may be mapped and transmitted without omitting the actual repetition having each one symbol (1004). If the actual repetition composed of one symbol is transmitted through PUSCH repetition transmission and DMRS through the method of the present invention, the channel coverage can be improved by estimating the energy gain of the channel and more precise channel.

<Second embodiment>

A second embodiment of the present disclosure provides a method for controlling simultaneous channel estimation for repeated PUSCH transmission.

11 is a flowchart illustrating an operation of a base station for setting resource allocation and DMRS mapping of repeated PUSCH transmission for simultaneous channel estimation, according to an embodiment of the present disclosure. This is for convenience of description, and according to settings and/or definitions on the system, all steps described below are not necessarily included, and some steps may be omitted.

The base station may transmit time domain resource configuration information including at least one of a PUSCH start symbol, the number of symbols (length), the number of repeated transmissions, and a PUSCH mapping type through higher layer signaling or L1 signaling (1101). Also, the base station may transmit resource configuration information for simultaneous channel estimation through higher layer signaling or L1 signaling (1102). The base station transmits (1103) downlink symbol configuration information through higher layer signaling (eg, TDD configuration) or L1 signaling (eg, slot format indicator), and is invalid according to the invalid symbol pattern set through upper layer signaling or L1 signaling Symbol information may be transmitted 1104 . The base station determines a symbol that can be actually transmitted based on the determined invalid symbol in the PUSCH resource configuration of each of the configured time domains (1105), and repeats PUSCH transmission and DMRS through the configured resource configuration method for simultaneous channel estimation. It is possible to determine the actual PUSCH repeated transmission resource having one symbol allocated to (1106). Thereafter, from the terminal, the base station may perform actual PUSCH repeated reception and simultaneous channel estimation in a designated resource.

12 is a flowchart illustrating an operation of a terminal performing resource allocation and DMRS mapping of repeated PUSCH transmission for simultaneous channel estimation, according to an embodiment of the present disclosure. This is for convenience of description, and according to settings and/or definitions on the system, all steps described below are not necessarily included, and some steps may be omitted.

The UE may receive time domain resource configuration information including at least one of a start symbol of a PUSCH, the number of symbols (length) and the number of repeated transmissions, and a PUSCH mapping type through higher layer signaling or L1 signaling ( 1201 ). From the base station, the terminal may receive resource configuration information for simultaneous channel estimation through higher layer signaling or L1 signaling (1202). The terminal receives downlink symbol configuration information through upper layer signaling (eg TDD configuration) or L1 signaling (eg Slot format indicator) (1203), and invalid symbol information according to the invalid symbol pattern set through upper layer signaling or L1 signaling may receive 1104 . The UE determines (1105) a symbol that can be actually transmitted based on the determined invalid symbol in the PUSCH resource configuration of each of the configured time domains, and repeats PUSCH transmission and DMRS based on the configured resource configuration for simultaneous channel estimation. may be allocated 1206 to an actual PUSCH repeated transmission resource having one symbol. Thereafter, from the base station, the terminal may repeatedly transmit the actual PUSCH in the designated resource.

The base station may set the resource allocation and DMRS mapping method according to the method proposed in the present disclosure for PUSCH repeated transmission and simultaneous channel estimation to the terminal. In the present invention, for repeated PUSCH transmission and DMRS assignment to the actual repetition consisting of one symbol, it can be set through higher layer signaling and L1 signaling, and according to the Bitmap format and the occasion and count number of nominal repetition/actual repetition as an indication method can be directed. In an example of the present disclosure, the method of PUSCH repetition resource allocation set to higher layer signaling and L1 signaling is for illustration only and does not limit the scope of the present disclosure.

<Third embodiment>

A third embodiment of the present disclosure provides a configuration method for DMRS mapping when repeatedly transmitting PUSCH and configuring simultaneous channel estimation.

13 is a diagram illustrating an example of simultaneous channel estimation and DMRS mapping when setting simultaneous channel estimation with PUSCH repetitive transmission type B according to an embodiment of the present disclosure.

Referring to FIG. 13, when the terminal receives the start symbol S of the uplink data channel set to 12, the length L is set to 6, and the number of repeated transmissions is set to 3, Nominal repetition can appear in two consecutive slots. There is (1301). In order to determine the invalid symbol, the terminal may determine the symbol set as the downlink symbol in each nominal repetition as the invalid symbol, and determine the symbols set to 1 in the invalid symbol pattern 1302 as the invalid symbol. In each nominal repetition, valid symbols, not invalid symbols, may set actual repetition in one slot (1303). For each of the set actual repetitions #0 and #1, the DMRS may be mapped to the first symbol of actual repetition based on the length of the symbol of actual repetition. At this time, if simultaneous channel estimation is set for actual repetition #0 and #1, DMRS overhead 1304 may occur in the repeated transmission of PUSCH with simultaneous channel estimation.

14 is a diagram illustrating an example of simultaneous channel estimation and DMRS mapping when setting simultaneous channel estimation with PUSCH repetitive transmission type B according to another embodiment of the present disclosure.

Referring to FIG. 14 , when the terminal receives the start symbol S of the uplink data channel set to 10, the length L is set to 7, and the number of repeated transmissions is set to 3, Nominal repetition can appear in two consecutive slots. There is (1401). In order to determine the invalid symbol, the terminal may determine the symbol set as the downlink symbol in each nominal repetition as the invalid symbol, and determine the symbols set to 1 in the invalid symbol pattern 1402 as the invalid symbol. In each nominal repetition, valid symbols, not invalid symbols, may set actual repetition in one slot (1403). When dmrs-AdditionalPosition is set to pos1 through higher layer signaling, the set actual repetition #2 is based on the length of the symbol of actual repetition. DMRS is set in the first symbol of actual repetition, and additional DMRS is the fourth symbol of actual repetition. is mapped to and actual repetition #3 may be mapped to the first symbol of actual repetition DMRS. At this time, if simultaneous channel estimation is set for actual repetition #2 and #3, continuous DMRS mapping 1404 may occur in the repeated PUSCH transmission with simultaneous channel estimation.

Hereinafter, a DMRS mapping method proposed in the present disclosure will be described when repeatedly transmitting PUSCH and setting simultaneous channel estimation. Through the DMRS mapping method proposed in the present disclosure, it is possible to improve channel estimation and channel performance by solving the DMRS overhead and continuous DMRS mapping problem.

[Method 1]

From the base station, when the UE receives PUSCH repeated transmission and simultaneous channel estimation through higher layer signaling and L1 signaling, for DMRS mapping, dmrs-AdditionalPosition is fixed to pos0 for DMRS mapping, or by applying the following [Table 9] to DMRS can be mapped. In this case, one or two DMRS mappings may be made for each actual repetition. In the present invention, the base station controls the number of DMRSs of actual repetition, thereby reducing the overhead of the DMRS. Through this, the DMRS overhead can be improved without additional complicated algorithms in a good channel state.

[Method 2]

When the UE receives configuration of repeated PUSCH transmission and simultaneous channel estimation through higher layer signaling and L1 signaling from the base station, PUSCH repeated transmission for simultaneous channel estimation may be grouped based on the set arbitrary variable for simultaneous channel estimation. Thereafter, the UE may repeatedly transmit the PUSCH by performing DMRS mapping based on the PUSCH repeated transmission group performing simultaneous channel estimation.

FIG. 15 is a diagram illustrating a DMRS mapping method when a UE is configured with a PUSCH repeated transmission type B and simultaneous channel estimation from a base station.

15, when the terminal receives the start symbol S of the uplink data channel set to 12, the length L is set to 6, and the number of repeated transmissions is set to 5, nominal repetition can appear in three consecutive slots. There is (1501). In order to determine the invalid symbol, the terminal may determine the symbol set as the downlink symbol in each nominal repetition as the invalid symbol, and determine the symbols set to 1 in the invalid symbol pattern 1502 as the invalid symbol. In each nominal repetition, valid symbols, not invalid symbols, can set actual repetition in one slot. When the terminal receives dmrs-AdditionalPosition set to pos1 through higher layer signaling, DMRS mapping may be performed based on the symbol length of each actual repetition (1503).

When the terminal receives 3 as an arbitrary variable k for setting the simultaneous channel estimation from the base station, the actual repetition group for simultaneous channel estimation may be set so that the number of actual repetitions capable of simultaneous channel estimation does not exceed k=3 (1504) ). The actual repetitions #0 and #1 set above are set to the Joint CE #0 group, actual repetition #2, #3, and #4 are set to the Joint CE #1 group, and actual repetitions #5 and #6 are set to the Joint CE # It can be set in 2 groups. For DMRS mapping according to an embodiment of the present disclosure, the UE may apply DMRS mapping to each Joint CE #0, #1, #2 that is always set. In addition, when the sum of the lengths of symbols of repeated PUSCH transmission for grouped simultaneous channel estimation is greater than 14, the total number of symbols L may be divided by 14 and DMRS mapping may be repeatedly applied. When a repeated PUSCH transmission group for simultaneous channel estimation is configured with non-consecutive repeated PUSCH transmission, the UE performs DMRS mapping based on the sum of the symbol lengths of each continuous PUSCH repeated transmission.

FIG. 16 is a diagram illustrating a DMRS mapping method of continuous or non-consecutive PUSCH repeated transmission when the UE is configured with PUSCH repeated transmission type B and simultaneous channel estimation from the base station.

Referring to FIG. 16 , a DMRS mapping method is illustrated when the UE receives PUSCH repetition transmission type B and two consecutive actual repetitions #0 and #1 are transmitted due to the slot boundary. DMRS may be mapped to the first symbol of actual repetition in the above-described DMRS mapping method. In this case, if the simultaneous channel estimation is set, the DMRS mapping method proposed in the present disclosure may be applied to two actual repetitions. When the simultaneous channel estimation is set, DMRS mapping may be performed based on the sum of the number of symbols of two consecutive actual repetitions #0 and #1 (1601).

In addition, a DMRS mapping method is shown when the UE receives PUSCH repetition transmission type B and two non-continuous actual repetitions #0 and #1 are transmitted due to a slot boundary and an invalid symbol. DMRS may be mapped to the first symbol of actual repetition in the above-described DMRS mapping method. In this case, if the simultaneous channel estimation is set, the DMRS mapping method proposed in the present disclosure may be applied to two non-continuous actual repetitions. When the simultaneous channel estimation is set, DMRS mapping may be performed based on the sum 1602 of the number of two non-consecutive actual repetitions #0 and #1 symbols. Alternatively, DMRS mapping may be performed based on the sum 1603 of the number of two non-consecutive actual repetitions #0 and #1 symbols and the number of invalid symbols.

Through the invention of the present disclosure, it is possible to improve the overhead of DMRS and continuous DMRS mapping by grouping repeated PUSCH transmissions for simultaneous channel estimation and applying the DMRS mapping method according to an embodiment of the present disclosure. In an example of the present disclosure, the PUSCH repetitive transmission grouping method and the DMRS mapping method set for simultaneous channel estimation with higher layer signaling and L1 signaling are for illustration only and do not limit the scope of the present disclosure, and for simultaneous channel estimation The set grouping method and arbitrary variable may be set to a bitmap, a length of a symbol/slot, and the number of nominal repetition/actual repetition. In addition, the methods described above may be applied as one or a combination thereof.

<Fourth embodiment>

A fourth embodiment of the present disclosure provides a method for mapping DMRSs when repeatedly transmitting PUSCH and configuring simultaneous channel estimation.

17 is a flowchart illustrating an operation of a base station for controlling simultaneous channel estimation configuration and DMRS mapping for actual PUSCH repeated transmission, according to an embodiment of the present disclosure. This is for convenience of description, and according to settings and/or definitions on the system, all steps described below are not necessarily included, and some steps may be omitted.

The base station may transmit PUSCH repeated transmission and simultaneous channel estimation configuration information through higher layer signaling or L1 signaling (1701). Thereafter, the base station may transmit downlink symbol configuration information and invalid symbol information according to an invalid symbol pattern through higher layer signaling (eg, TDD configuration) or L1 signaling (eg, slot format indicator) (1702). In addition, in the PUSCH resource of the set time domain, the PUSCH to be actually transmitted is divided based on the slot boundary and nominal repetitive transmission configuration (1703), and the actual PUSCH repeated transmission to perform simultaneous channel estimation based on the configured simultaneous channel estimation configuration information. A group may be determined (1704). The base station may determine the DMRS mapping position based on the actual PUSCH repetition transmission group for performing the set simultaneous channel estimation ( 1705 ), and receive the actual PUSCH repetition for simultaneous channel estimation in a designated resource ( 1706 ). Thereafter, the base station may perform simultaneous channel estimation on the received actual PUSCH repeated transmission based on the received simultaneous channel estimation configuration information ( 1707 ).

18 is a flowchart for describing a DMRS mapping method of a UE in which simultaneous channel estimation for repeated PUSCH transmission is set, according to an embodiment of the present disclosure. This is for convenience of description, and according to settings and/or definitions on the system, all steps described below are not necessarily included, and some steps may be omitted.

The UE may receive repeated PUSCH transmission and simultaneous channel estimation configuration information through higher layer signaling or L1 signaling (1801). Thereafter, the UE may receive downlink symbol configuration information and invalid symbol information according to an invalid symbol pattern through higher layer signaling (eg, TDD configuration) or L1 signaling (eg, slot format indicator) (1802). In addition, the UE distinguishes (1803) the PUSCH to be actually transmitted based on the slot boundary and nominal repetitive transmission configuration in the PUSCH resource of the configured time domain, and the actual PUSCH to perform simultaneous channel estimation based on the configured simultaneous channel estimation configuration information. After determining the repetitive transmission group (1804), the DMRS may be mapped based on the actual PUSCH repetitive transmission group for which the set simultaneous channel estimation is to be performed (1805). Thereafter, repeated actual PUSCH transmission for simultaneous channel estimation may be performed on a designated resource ( 1806 ).

The base station may be determined by using one of the following methods or combinations thereof for the above-described PUSCH repetitive transmission grouping and arbitrary variable setting for DMRS mapping for simultaneous channel estimation.

[Method 1]

The base station can operate by setting at least one of the number of slots, the number of nominal repetitions, the number of actual repetitions, and the number of available symbols as an arbitrary control variable for PUSCH repeated transmission grouping and DMRS mapping for simultaneous channel estimation. have. In this case, repeated PUSCH transmissions estimated at the same time channel may be divided into one PUSCH repetition transmission group through the set arbitrary variable, and DMRS mapping may be performed based on the PUSCH repetition transmission group. In this case, the PUSCH repeated transmission group may be applied on the same occasion.

[Method 2]

In order to perform PUSCH repetitive transmission grouping and DMRS mapping for simultaneous channel estimation, the base station may control PUSCH repetitive transmission grouping and DMRS mapping for simultaneous channel estimation through bitmap with higher layer signaling and L1 signaling. In this case, the UE may set and transmit the same PUSCH occasion for the PUSCH repeated transmission group in which the simultaneous channel estimation is performed.

The base station may control PUSCH repetitive transmission grouping and DMRS mapping for simultaneous channel estimation by utilizing the control method for simultaneous channel estimation. In addition, the base station may control the simultaneous channel estimation using one or combinations of the methods described above.

<Fifth embodiment>

A fifth embodiment of the present disclosure provides a channel estimation method based on artificial intelligence (AI)/machine learning (ML).

Currently, in performing communication between a terminal and a base station in a B5G/6G communication system, a signal is transmitted and received using an artificial neural network as a method for solving a problem of a non-linear communication system and an overhead of wireless communication signaling. method is being studied. Through the method of the present disclosure, a method for reducing the overhead of an uplink reference signal of a terminal is proposed. Hereinafter, an embodiment of the present disclosure will be described as an example for reducing the overhead of DMRS when the method and apparatus proposed in the embodiment of the present disclosure transmit PUSCH over multiple slots, but it is not limited to each embodiment and is not applied in the disclosure. It may also be possible to utilize all or a combination of some or all of the proposed one or more embodiments in a resource setting method corresponding to another channel. In addition, in order to reduce the overhead of other reference signals, the method proposed in the present disclosure may be applied.

19 is a flowchart illustrating an operation of a base station for controlling AI-based simultaneous channel estimation and DMRS mapping, according to an embodiment of the present disclosure.

The base station may receive capability and/or requesting information of the terminal for supporting AI/ML through higher layer signaling or L1 signaling (1901). Whether to apply AI-based channel estimation and setting information may be determined based on the received information of the terminal (1902). In this case, the configuration information may include information on a duration for estimating a channel of an adjacent PUSCH through a DMRS transmitted in one PUSCH through the AI model. For example, if the duration is set to 6 slots or 6 repetitions, the terminal transmits DMRS through one random PUSCH when transmitting type A PUSCH repetition #0 to #5 within the duration and transmits the remaining five DMRS less PUSCHs. Thus, it is possible to improve the overhead of DMRS within the duration. In this case, the base station may decode the DMRS less PUSCH using the DMRS received in one PUSCH transmission. Additionally, the AI-based channel estimation configuration information may include information indicating whether AI-based channel estimation is applied to non-consecutive PUSCH transmission. For example, if a feature indicator or field (eg, 'Enabling-NonconsecutiveAI-CE') is enabled through higher layer signaling and L1 signaling, a non-contiguous physical slot within the duration set for the AI-based channel estimation For PUSCH transmission transmitted through , AI-based channel estimation may be performed. Thereafter, the base station may transmit the determined AI-based channel estimation configuration information through higher layer signaling and L1 signaling (1903). Thereafter, the base station may determine a window (or duration) for applying the AI-based channel estimation based on the set configuration information (1904). In this case, in the case of window (or duration), semi-static RRC configurations (eg, tdd-UL-DL-ConfigurationCommon, tdd-UL-DL-ConfigurationDedicated, ssb-PositionsInBurst, etc.) and It may be configured based on an available slot determined through time domain resource allocation (TDRA) configured for PUSCH transmission. In addition, in the case of Rel-15/16 PUSCH transmission, it may be configured in consideration of continuous physical slots. Thereafter, the base station may determine a location for mapping the DMRS within the determined window (1905). The base station may apply the method of the third embodiment or the fourth embodiment as a method for mapping the DMRS within the determined window. In addition, PUSCH including DMRS and DMRS less PUSCH can be selectively configured. In this case, as a setting method, it can be set in various ways through a predefined method, a bitmap method, and a PUSCH number setting to include DMRS in the window. Thereafter, the base station may receive a PUSCH including a DMRS and a DMRS less PUSCH based on the determined information (1906). The base station can estimate the channel of DMRS less PUSCH using the AI model using the received DMRS and decode all PUSCHs (1907).

20 is a flowchart illustrating an operation of a terminal controlling AI-based simultaneous channel estimation and DMRS mapping, according to an embodiment of the present disclosure.

The UE may transmit capability and/or requesting information of the UE for supporting AI/ML through higher layer signaling or L1 signaling (2001). Thereafter, the terminal may receive AI-based channel estimation configuration information through higher layer signaling and L1 signaling from the base station (2002). Thereafter, the terminal may determine a window (or duration) for applying the AI-based channel estimation based on the received configuration information (2003). In this case, in the case of window (or duration), semi-static RRC configurations (eg, tdd-UL-DL-ConfigurationCommon, tdd-UL-DL-ConfigurationDedicated, ssb-PositionsInBurst, etc.) and It may be configured based on an available slot determined through TDRA configured for PUSCH transmission. In addition, in the case of Rel-15/16 PUSCH transmission, it may be configured in consideration of continuous physical slots. Thereafter, the base station may determine a location for mapping the DMRS within the determined window (2004). The UE may apply the method of the third embodiment or the fourth embodiment as a method for mapping the DMRS within the determined window. In addition, PUSCH including DMRS and DMRS less PUSCH can be selectively configured. In this case, the PUSCH unit setting method may be variously set through a predefined method, a bitmap method, and setting a PUSCH number to include DMRS in the window. Finally, the UE may transmit a PUSCH including a DMRS and a DMRS less PUSCH based on the determined information (2005).

Based on the flowchart of the base station and the terminal, the base station and the terminal provide AI-based channel estimation, and can solve the DMRS overhead problem caused by DMRS less PUSCH transmission. Through this, the coverage of the uplink can be improved, and it can be used more effectively in a communication system of a very high frequency (mmWave) band.

21 is a diagram illustrating a window setting method and a DMRS mapping method for performing AI-based simultaneous channel estimation during repeated PUSCH transmission in an FDD system.

Referring to FIG. 21, the UE performs an actual AI-based channel estimation in consideration of a window setting method 2101 based on configuration information 2102 for AI-based channel estimation from a base station and a PUSCH actually transmitted during repeated PUSCH transmission. A window setting method 2103 is provided. The UE may receive AI-based channel estimation configuration information with window = 6 slots or repetitions, Non-consecutive = 'disabled' or 'off' through upper layer signaling and L1 signaling (2102). The terminal uses time domain windows (TDWs) for AI-based channel estimation based on the received AI-based channel estimation configuration information (eg, AI based TDW#1, AI based TDW#2, AI based TDW#3) may be determined for repeated PUSCH transmission. In this case, the UE may map the DMRS to the AI based TDW using the DMRS pattern set through higher layer signaling and L1 signaling. The set DMRS pattern may be set through various methods such as Density, the interval between DMRSs, the total number of DMRSs, a sequence-based method, a bitmap method, or a Predefined method (eg, half of AI based TDW) or a combination thereof. can Thereafter, it is possible to determine the AI based actual duration according to the events 2104 that makes AI based channel estimation impossible in the AI based TDW. The above-described event may mean a case in which a condition for AI-based channel estimation between PUSCHs cannot be maintained due to higher layer signaling and L1 signaling. When an event occurs, the UE may re-perform or stop AI-based channel estimation according to whether the UE's capability or timeline is satisfied. If the UE can perform AI-based channel estimation again after the event, the UE may be configured with one or more AI based actual durations in the AI based TDW. More specifically, referring to FIG. 21 , if Event 2104 occurs in AI based TDW#1 in the terminal and the terminal can perform AI-based channel estimation again after the event, the terminal is in AI based TDW#1 AI based actual duration#1-1 and AI based actual duration#1-2 can be determined. In this case, the DMRS mapping method previously applied in AI based TDW#1 may be applied to each AI based actual durations (2103).

22 is a diagram illustrating a window setting method and a DMRS mapping method for performing AI-based simultaneous channel estimation during repeated PUSCH transmission in a TDD system.

Referring to FIG. 22, the UE performs an actual AI-based channel estimation in consideration of a window setting method 2201 based on configuration information 2202 for AI-based channel estimation from a base station and a PUSCH actually transmitted during repeated PUSCH transmission. A window setting method 2203 is provided. The UE may receive AI-based channel estimation configuration information with window = 7 slots or repetitions, Non-consecutive = 'disabled' or 'off' through higher layer signaling and L1 signaling (2202). According to the received AI-based channel estimation configuration information and available slot-based counting, the UE receives TDWs for AI-based channel estimation in consideration of a physical slot or an available slot (eg, AI based TDW#1, AI based TDW# 2) may be determined for repeated PUSCH transmission. More specifically, as shown in FIG. 22 , when the length of the AI based window is set to 7 slots and available slot based counting is set, the terminal receives AI based TDW#1 for 7 slots from the first available slot S#0. , and then a second AI based TDW#2 can be determined for 7 slots from available slot S#2. In this case, the UE may map the DMRS to the AI based TDW using the DMRS pattern set through higher layer signaling and L1 signaling. The set DMRS pattern includes various methods such as Density, an interval between DMRSs, the total number of DMRSs, a sequence-based method, a bitmap method, or a Predefined method (eg, half of the number of available slots in AI based TDW), or a combination thereof. can be set through Thereafter, the AI based actual duration according to the events 2204 that makes AI based channel estimation impossible in the AI based TDW may be determined. The above-described event may mean a case in which a condition for AI-based channel estimation between PUSCHs cannot be maintained due to higher layer signaling and L1 signaling. When an event occurs, the UE may re-perform or stop AI-based channel estimation according to whether the UE's capability or timeline is satisfied. If the UE can perform AI-based channel estimation again after the event, the UE may be configured with one or more AI based actual durations in the AI based TDW. More specifically, referring to FIG. 22 , if event 2204 occurs in AI based TDW#1 in the terminal and the terminal can perform AI-based channel estimation again after the event, the terminal is in AI based TDW#1 AI based actual duration#1-1 and AI based actual duration#1-2 can be determined. In this case, the DMRS mapping method previously applied in AI based TDW#1 may be applied to each AI based actual durations (2203).

Through the method of the present disclosure, a setting-based window for AI-based channel estimation in an FDD or TDD system and an actual duration to which an actual channel estimation is applied may be determined. Through this, it is possible to improve the uplink coverage by solving the DMRS overhead problem through DMRS less PUSCH transmission in the section where AI-based channel estimation is performed.

Meanwhile, between the embodiments and methods described above in the present disclosure, each configuration or step may be selectively combined/combined and applied.

23 is a block diagram of a terminal according to an embodiment of the present disclosure.

Referring to FIG. 23 , the terminal 2300 may include a transceiver 2301 , a control unit (processor) 2302 , and a storage unit (memory) 2303 . According to an efficient channel and signal transmission/reception method in the 5G communication system corresponding to the above-described embodiment, the transmission/reception unit 2301, the control unit 2302, and the storage unit 2303 of the terminal 2300 may operate. However, components of the terminal 2300 according to an embodiment are not limited to the above-described example. According to another embodiment, the terminal 2300 may include more or fewer components than the aforementioned components. In addition, in a specific case, the transceiver 2301 , the control unit 2302 , and the storage unit 2303 may be implemented in the form of a single chip.

According to another embodiment, the transceiver 2301 may include a transmitter and a receiver. The transceiver 2301 may transmit/receive a signal to/from the base station. The signal may include control information and data. To this end, the transceiver 2301 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts a received signal. In addition, the transceiver 2301 may receive a signal through a wireless channel, output it to the controller 2302 , and transmit the signal output from the controller 2302 through a wireless channel.

The controller 2302 may control a series of processes in which the terminal 2300 may operate according to the above-described embodiment of the present disclosure. For example, the controller 2302 may perform a method of changing an OFDM symbol position of a DMRS in consideration of a method of estimating a channel using DMRSs transmitted in a plurality of PUSCHs simultaneously according to an embodiment of the present disclosure. To this end, the controller 2302 may include at least one processor. For example, the controller 2302 may include a communication processor (CP) that controls for communication and an application processor (AP) that controls an upper layer such as an application program.

The storage unit 2303 may store control information or data such as information related to channel estimation using DMRSs transmitted in a PUSCH included in a signal obtained from the terminal 2300, and data required for control of the controller 2302 and The controller 2302 may have an area for storing data generated during control.

24 is a block diagram of a base station according to an embodiment of the present disclosure.

Referring to FIG. 24 , the base station 2400 may include a transceiver 2401 , a control unit (processor) 2402 , and a storage unit (memory) 2403 . According to an efficient channel and signal transmission/reception method in the 5G communication system corresponding to the above-described embodiment, the transmission/reception unit 2401, the control unit 2402, and the storage unit 2403 of the base station 2400 may operate. However, components of the base station 2400 according to an embodiment are not limited to the above-described example. According to another embodiment, the base station 2400 may include more or fewer components than the above-described components. In addition, in a specific case, the transceiver 2401 , the controller 2402 , and the storage unit 2403 may be implemented in the form of a single chip.

The transceiver 2401 may include a transmitter and a receiver according to another embodiment. The transceiver 2401 may transmit/receive a signal to/from the terminal. The signal may include control information and data. To this end, the transceiver 2401 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts a received signal. In addition, the transceiver 2401 may receive a signal through a wireless channel, output it to the controller 2402 , and transmit the signal output from the controller 2402 through a wireless channel.

The controller 2402 may control a series of processes so that the base station 2400 can operate according to the above-described embodiment of the present disclosure. For example, the controller 2402 may perform a method of changing an OFDM symbol position of a DMRS in consideration of a method of estimating a channel using DMRSs transmitted in a PUSCH according to an embodiment of the present disclosure. To this end, the controller 2402 may include at least one processor. For example, the controller 2402 may include a communication processor (CP) that controls for communication and an application processor (AP) that controls an upper layer such as an application program.

The storage unit 2403 may store control information such as information related to channel estimation, data, or control information and data received from the terminal, using DMRSs transmitted in the PUSCH determined by the base station 2400, and It may have an area for storing data required for control and data generated during control by the controller 2402 .

On the other hand, the embodiments disclosed in the present specification and drawings are merely presented as specific examples to easily explain the technical content of the present disclosure and help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is apparent to those of ordinary skill in the art to which the present disclosure pertains that other modifications are possible based on the technical spirit of the present disclosure. In addition, each of the above embodiments may be operated in combination with each other as needed.

Claims (1)

A control signal processing method in a wireless communication system, comprising:
Receiving a first control signal transmitted from the base station;
processing the received first control signal; and
and transmitting a second control signal generated based on the processing to the base station.

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