Method and apparatus for uplink transmission power control in a wireless cellular communication system

Abstract

A communication technology for converging IoT technology with a 5G communication system for supporting a high data transmission rate beyond that of a 4G system is disclosed, together with a system thereof. The disclosure can be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. Methods performed by a terminal and a system in a wireless communication system are disclosed.

Description

[0001] This case is a divisional application of the invention patent application filed on April 24, 2018, with application number 201880029299.X and invention title "Uplink Transmission Power Control Method and Device in Wireless Cellular Communication System". Technical Field

[0002] This disclosure relates to a method and apparatus for controlling the power of uplink transmission in a wireless cellular communication system. Background Technology

[0003] To meet the increasing demand for wireless data services since the commercialization of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are referred to as super-4G network communication systems or post-LTE systems.

[0004] To achieve high data transmission rates, 5G communication systems are being considered for implementation in millimeter-wave bands (e.g., the 60 GHz band). In 5G communication systems, technologies such as beamforming, massive MIMO (Multiple Input Multiple Output), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO are being discussed as means to mitigate propagation path loss and increase propagation distance in the millimeter-wave band.

[0005] In addition, 5G communication systems have developed technologies such as evolved small cells, advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, mobile networks, cooperative communication, coordinated multi-points (CoMP), and receive interference cancellation to improve the system network.

[0006] In addition, 5G systems have developed advanced coding modulation (ACM) schemes such as hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), as well as advanced access technologies such as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA).

[0007] Meanwhile, the internet has evolved from a human-centric network where humans generate and consume information to the Internet of Things (IoT), in which distributed components, such as objects, exchange and process information. The Internet of Everything (IoE) technology has emerged, in which big data processing technology is combined with IoT technology through connections to cloud servers, etc. To implement IoT, technological factors such as sensing technology, wired / wireless communication, network infrastructure, service interface technology, and security technology are required, and recently, technologies for connecting objects (such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC)) have been researched. In the IoT environment, by collecting and analyzing data generated from connected objects, intelligent Internet technology (IT) services can be provided to create new value for people's lives. IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars, connected cars, smart grids, healthcare, smart appliances, or high-tech medical services through the integration of traditional information technology (IT) and various industries.

[0008] Therefore, various attempts have been made to apply 5G communication to IoT networks. For example, 5G communication technologies such as sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) are implemented using beamforming, MIMO, and array antenna schemes. The application of cloud RAN as a big data processing technology may be an example of the convergence of 5G and IoT technologies.

[0009] Based on recent developments in Long-Term Evolution (LTE) and Advanced LTE, there is a need for a method and apparatus for controlling the power of uplink transmission in wireless cellular communication systems. Summary of the Invention

[0010] Technical issues

[0011] This disclosure provides a method and apparatus according to the method, by which a terminal controls the power of uplink transmissions within the terminal's maximum transmission power value in order to maintain uplink coverage when the transmission intervals of uplink transmissions (such as uplink data channels, uplink control, or uplink sounding reference signals) vary in units of OFDM symbols, or in order to meet reliability requirements in ultra-reliable services.

[0012] Problem Solution

[0013] According to one aspect of this disclosure, a terminal method includes: identifying the number of symbols to be used for uplink transmission; determining the transmission power for uplink transmission based on the number of symbols; and transmitting uplink signals to a base station in the symbols using the transmission power.

[0014] According to another aspect of this disclosure, the terminal includes: a transceiver configured to transmit and receive signals; and a controller configured to identify the number of symbols to be used for uplink transmission, determine the transmission power for uplink transmission based on the number of symbols, and transmit uplink signals to the base station in the symbols using the transmission power.

[0015] According to another aspect of this disclosure, a base station method includes: sending information related to uplink transmission power to a terminal; and receiving from the terminal an uplink signal transmitted with a transmission power determined based on the information, wherein the transmission power is determined based on the number of symbols in which the uplink signal is transmitted.

[0016] According to another aspect of this disclosure, the base station includes: a transceiver configured to transmit and receive signals; and a controller configured to transmit information related to uplink transmission power to a terminal; and to receive from the terminal an uplink signal transmitted with a transmission power determined based on the information, wherein the transmission power is determined based on the number of symbols in which the uplink signal is transmitted.

[0017] According to another aspect of this disclosure, a method performed by a terminal in a wireless communication system includes: receiving system information from a base station, the system information including information associated with an uplink subcarrier spacing, information associated with the number of physical uplink control channel (PUCCH) symbols, and information associated with uplink power control for the PUCCH; receiving, on a physical downlink control channel (PDCCH), a power control command for the PUCCH and physical resource block (PRB) information for the PUCCH from the base station; and transmitting the PUCCH to the base station on the PRB defined by the PRB information for the PUCCH, based on the uplink subcarrier spacing and the power identified based on the number of PUCCH symbols and the power control command for the PUCCH.

[0018] According to another aspect of this disclosure, a method performed by a base station in a wireless communication system includes: sending system information to a terminal, the system information including information associated with uplink subcarrier spacing, information associated with the number of physical uplink control channel (PUCCH) symbols, and information associated with uplink power control for PUCCH; sending a power control command for PUCCH and physical resource block (PRB) information for PUCCH to the terminal on a physical downlink control channel (PDCCH); and receiving PUCCH from the terminal on a PRB defined by the PRB information for PUCCH based on the uplink subcarrier spacing, the number of PUCCH symbols, and the power control command for PUCCH.

[0019] According to another aspect of this disclosure, a terminal in a wireless communication system includes: a transceiver configured to transmit or receive signals; and a controller configured to: receive system information from a base station, the system information including information associated with uplink subcarrier spacing, information associated with the number of physical uplink control channel (PUCCH) symbols, and information associated with uplink power control for PUCCH; receive power control commands for PUCCH and physical resource block (PRB) information for PUCCH from the base station on a physical downlink control channel (PDCCH); and identify power based on the uplink subcarrier spacing and the number of PUCCH symbols and the power control commands for PUCCH; and transmit PUCCH to the base station on the PRB defined by the PRB information for PUCCH.

[0020] According to another aspect of this disclosure, a base station in a wireless communication system includes: a transceiver configured to transmit or receive signals; and a controller configured to: transmit system information to a terminal, the system information including information associated with uplink subcarrier spacing, information associated with the number of physical uplink control channel (PUCCH) symbols, and information associated with uplink power control for PUCCH; transmit power control commands for PUCCH and physical resource block (PRB) information for PUCCH to the terminal on a physical downlink control channel (PDCCH); and receive PUCCH from the terminal on a PRB defined by the PRB information for PUCCH based on the uplink subcarrier spacing, the number of PUCCH symbols, and the power control commands for PUCCH.

[0021] Beneficial effects of the invention

[0022] According to this disclosure, when the transmission interval of uplink transmissions such as uplink data channels, uplink control channels, and uplink sounding reference signals varies in units of OFDM symbols, when uplink transmissions are performed in a service requiring ultra-reliability, or when a terminal transmits uplink data channels, uplink control channels, and uplink sounding reference signals, by means of the method according to this disclosure, the terminal can control the power of uplink transmissions within the terminal's maximum transmission power value, thereby maintaining uplink coverage and satisfying the reliability of uplink transmissions. Attached Figure Description

[0023] Figure 1 This illustrates the basic structure of the time-frequency region in an LTE system;

[0024] Figure 2 This illustrates an example where 5G services are reused within a single system;

[0025] Figure 3 An embodiment of a communication system applying the present disclosure is shown;

[0026] Figure 4 The operation of a terminal and a base station in a communication system using the proposed embodiments is illustrated;

[0027] Figure 5 This illustrates the transmission of the physical uplink control channel (PUCCH) in a 5G system.

[0028] Figure 6The diagram illustrates uplink transmissions in a 5G system, including PUCCH, sounding reference signal (SRS), and physical uplink shared channel (PUSCH) transmissions.

[0029] Figure 7 The process of a base station and a terminal according to embodiments of the present disclosure is illustrated;

[0030] Figure 8 A base station apparatus according to the present disclosure is shown; and

[0031] Figure 9 A terminal device according to this disclosure is shown. Detailed Implementation

[0032] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description of the present disclosure, detailed descriptions of known functions or configurations incorporated herein will be omitted where such inclusion might make the subject matter of the disclosure considerably unclear. The terminology described below is defined in consideration of the functions in the present disclosure and may vary depending on the user, the user's intent, or habits. Therefore, the definitions of the terminology should be made based on the entirety of this specification.

[0033] The advantages and features of this disclosure, as well as the ways in which they are implemented, will become apparent from the embodiments described in detail below with reference to the accompanying drawings. However, this disclosure is not limited to the embodiments set forth below, but can be implemented in a variety of different forms. The following embodiments are provided only to fully disclose this disclosure and to inform those skilled in the art of its scope, and this disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals denote the same or similar elements.

[0034] Here it will be understood that each block in the flowchart illustration, and combinations of blocks in the flowchart illustration, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable storage medium, which can instruct the computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-usable or computer-readable storage medium produce an article of writing including instruction means for implementing the functions specified in one or more flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus, thereby producing a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowchart blocks.

[0035] Furthermore, each block in the flowchart can represent a module, segment, or section of code, which includes one or more operable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions marked in the blocks may occur out of order. For example, depending on the functions involved, two blocks shown consecutively may actually run substantially simultaneously, or these blocks may sometimes run in reverse order.

[0036] As used herein, "cell" refers to a software or hardware element that performs a predetermined function, such as a Field Programmable Gate Array (FPGA) or Application Specific Integrated Circuit (ASIC). However, "cell" is not always limited to software or hardware. A "cell" can be configured to reside in addressable memory or run one or more processors. Therefore, a "cell" includes, for example, software elements, object-oriented software elements, class elements or task elements, procedures, functions, attributes, programs, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. Elements and functions provided by a "cell" can be combined into a smaller number of element "cells" or divided into a larger number of element "cells." Furthermore, elements and "cells" can be implemented to reproduce one or more CPUs within a device or secure multimedia card.

[0037] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description of the present disclosure, detailed descriptions of known functions or configurations incorporated herein will be omitted where such inclusion might make the subject matter of the disclosure considerably unclear. The terminology described below is defined in consideration of the functions in the present disclosure and may vary depending on the user, the user's intent, or habits. Therefore, the definitions of the terminology should be made based on the entirety of this specification.

[0038] Furthermore, the detailed description of the embodiments of this disclosure is primarily based on a wireless communication system (which is based on OFDM, particularly the 3GPP EUTRA standard). However, the subject matter of this disclosure can be applied, with slight modifications, to other communication systems with similar technical backgrounds and channel configurations without departing from the scope of this disclosure, as can be determined by those skilled in the art.

[0039] Meanwhile, in order to implement this in mobile communication systems, the coexistence of new 5G communication (also referred to in this disclosure as "new radio (NR) communication") and traditional LTE communication in the same spectrum is being studied.

[0040] This disclosure relates to wireless communication systems, and more specifically, to a method and apparatus in which a terminal capable of transmitting and receiving data in at least one of different communication systems existing at one or more carrier frequencies transmits data to each of the communication systems and receives data from each of the communication systems.

[0041] Mobile communication systems are typically developed to provide voice services while ensuring user mobility. However, mobile communication systems have gradually expanded their service scope from voice to data services. In recent years, mobile communication systems have evolved to the point where they can provide high-speed data services. However, due to the lack of resources in current mobile communication systems and user demands for even higher speeds, further improvements to mobile communication systems are needed.

[0042] To meet this demand, the 3rd-generation partnership project (3GPP) has advanced the standardization of Long-Term Evolution (LTE) as one of the next-generation mobile communication systems under development. LTE technology is designed to implement high-speed packet communication with a maximum transmission rate of 100 Mbps. Several approaches are being discussed for this purpose, including methods to reduce the number of nodes on the communication channel by simplifying the network architecture and methods to place the wireless protocol as close as possible to the wireless channel.

[0043] When decoding fails during the initial transmission, the LTE system employs a hybrid automatic repeat request (HARQ) scheme at the physical layer to retransmit the corresponding data. In HARQ, when the receiver fails to decode the data accurately, it sends a negative acknowledgment (NACK) to notify the transmitter of the decoding failure, allowing the transmitter to retransmit the corresponding data at the physical layer. The receiver combines the retransmitted data with the data that failed to decode, thereby improving data reception performance. Furthermore, when the receiver successfully decodes the data, it sends an acknowledgment (ACK) to report successful decoding, allowing the transmitter to send new data.

[0044] Figure 1 The basic structure of the time-frequency region is shown. The time-frequency region is the radio resource area for transmitting data or control channels in the downlink of an LTE system.

[0045] exist Figure 1 In the diagram, the horizontal axis represents the time region, and the vertical axis represents the frequency region. Within the time region, the smallest unit of transmission is an OFDM symbol. A time slot of 10⁶ consists of N... symb A radio frame 105 consists of 102 OFDM symbols, and a subframe 105 consists of two time slots. The length of a time slot is 0.5 milliseconds, and the length of a subframe is 1.0 millisecond. A radio frame 114 is a time region unit consisting of 10 subframes. The smallest transmission unit in the frequency region is a subcarrier, and the total system transmission bandwidth is N. BW It consists of 104 subcarriers.

[0046] In the time-frequency region, the basic resource unit is a resource element (RE) 112, and the RE is represented by an OFDM symbol index and a subcarrier index. A resource block (RB) (or physical resource block (PRB)) 108 is formed by N in the time region. symb A continuous OFDM symbol 102 and N in the frequency region RB A series of consecutive subcarriers 110 define an RB 108. Therefore, an RB 108 is defined by N. symb x N RB It consists of 112 REs. Typically, the smallest unit of data transmission is an RB. In LTE systems, typically N... symb =7 and N RB =12. N BW and N RBThe data rate is proportional to the bandwidth of the system's transmission frequency band. The data rate increases proportionally to the number of RBs scheduled for the terminal. The LTE system defines and operates six transmission bandwidths. In the case of an FDD system where downlink and uplink are divided according to frequency, the downlink and uplink transmission bandwidths can be different from each other. Channel bandwidth refers to the radio-frequency (RF) bandwidth corresponding to the system transmission bandwidth. [Table 1] shows the relationship between the system transmission bandwidth and channel bandwidth defined in the LTE system. For example, if the LTE system has a 10MHz channel bandwidth, the transmission bandwidth consists of 50 RBs.

[0047] [Table 1]

[0048]

[0049] Downlink control information is transmitted within N initial OFDM symbols in a subframe. Typically, N = {1, 2, 3}. Therefore, the value of N for each subframe can be varied based on the amount of control information to be transmitted in the current subframe. The control information may include a control channel transmission interval indicator, scheduling information associated with downlink or uplink data, HARQ ACK / NACK signals, etc., where the control channel transmission interval indicator indicates the number of OFDM symbols through which control information will be transmitted.

[0050] In LTE systems, scheduling information associated with downlink or uplink data can be transmitted from the base station to the terminal via downlink control information (DCI). Uplink (UL) is the radio link through which the terminal transmits data or control signals to the base station, and downlink (DL) is the radio link through which the base station transmits data or control signals to the terminal. DCI is defined in various formats. The DCI format can be determined and applied in operation based on whether the scheduling information is used for uplink data (UL license) or downlink data (DL license), whether the DCI is a compact DCI with smaller control information, whether spatial multiplexing using multiple antennas is applied, and whether the DCI is used for power control, etc. For example, DCI format 1 corresponding to scheduling control information (DL license) for downlink data can be configured to include at least the following control information.

[0051] - Resource Allocation Type 0 / 1 Flag: Indicates whether the resource allocation type is Type 0 or Type 1. Type 0 uses a bitmap scheme and allocates resources in units of resource block groups (RBGs). In LTE systems, the basic scheduling unit is a resource block (RB) represented by time and frequency region resources, and an RBG consists of multiple RBs and is used as the basic scheduling unit in the Type 0 scheme. Type 1 allows the allocation of predetermined RBs within an RBG.

[0052] - Resource Block Allocation: Indicates the Resource Blocks (RBs) allocated for data transmission. The resources indicated are determined based on system bandwidth and resource allocation scheme.

[0053] - Modulation and coding scheme (MCS): Indicates the modulation scheme used for data transmission and the size of the transport block, which is the data to be sent.

[0054] -HARQ procedure number: The procedure number indicating the HARQ.

[0055] - New data indicator: Indicates HARQ initial transmission or HARQ retransmission.

[0056] - Redundant version: Indicates a redundant version of HARQ.

[0057] - Transmit power control (TPC) commands for the Physical Uplink Control Channel (PUCCH): Indicates the transmission power control commands used for the PUCCH as an uplink control channel.

[0058] Through channel coding and modulation processes, DCI is transmitted via the physical downlink control channel (PDCCH) or the enhanced PDCCH (EPCCH), which serves as the downlink physical control channel.

[0059] Generally, DCI is channel-coded independently for each terminal and then configured and transmitted as an independent PDCCH. In the time zone, the PDCCH is mapped and transmitted during the control channel transmission interval. The frequency zone mapping location of the PDCCH is determined by the identifier (ID) of each terminal and propagated throughout the system transmission band.

[0060] Downlink data is transmitted via the Physical Downlink Shared Channel (PDSCH), which serves as the physical downlink data channel. The PDSCH is transmitted after the control channel transmission interval, and detailed mapping locations in the frequency region and scheduling information such as modulation schemes are indicated by the DCI transmitted via the PDCCH.

[0061] Through the 5-bit MCS included in the control information within the DCI, the base station can report the modulation scheme applied to the PDSCH to be sent to the terminal and the size of the data to be transmitted (transport block size, TBS). The TBS corresponds to the size before the channel coding for error correction is applied to the data (TB) to be transmitted by the BS.

[0062] The modulation schemes supported by the LTE system include Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (16QAM), and 64QAM. The modulation order (Qm) corresponds to 2, 4, and 6, respectively. That is, in QPSK modulation, 2 bits are transmitted per symbol; in 16QAM modulation, 4 bits are transmitted per symbol; and in 64QAM modulation, 6 bits are transmitted per symbol.

[0063] Unlike LTE Rel-8, 3GPP LTE Rel-10 employs bandwidth extension technology to support a greater volume of data transmission. Compared to LTE Rel-8 terminals that transmit data within a single frequency band, a technique called bandwidth extension or carrier aggregation (CA) can expand the frequency band, thus increasing the amount of data that can be transmitted through the extended band. Each frequency band is called a component carrier (CC), and an LTE Rel-8 terminal is defined as having one component carrier for each of the downlink and uplink. Furthermore, a group of uplink component carriers connected to the downlink component carriers via SIB-2 is called a cell. The SIB-2 connection between the downlink and uplink component carriers is transmitted via system signals or higher-level signals. A UE supporting CA can receive downlink data and transmit uplink data through multiple serving cells.

[0064] In LTE Rel-10, when a base station has difficulty transmitting the Physical Downlink Control Channel (PDCCH) to a specific terminal in a specific serving cell, the base station can transmit the PDCCH in another serving cell and configure the carrier indicator field (CIF) to indicate whether the corresponding PDCCH is the Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH) of the other serving cell. The CIF can be configured in terminals that support CA. By adding 3 bits to the PDCCH in a specific serving cell, the CIF is determined to indicate the other serving cell, and it is included only when cross-carrier scheduling is performed; if the CIF is not included, cross-carrier scheduling is not performed. When the CIF is included in the Downlink Allocation Information (DL Allocation), the CIF is defined as indicating the serving cell to which it transmits the PDSCH scheduled by the DL Allocation. When the CIF is included in the Uplink Resource Allocation Information (UL Grant), the CIF is defined as indicating the serving cell to which it transmits the PUSCH scheduled by the UL Grant.

[0065] As described above, Carrier Aggregation (CA) is defined as a bandwidth extension technology in LTE-10, allowing multiple serving cells to be configured in a terminal. The UE periodically or non-periodically transmits channel information for multiple serving cells to the base station for data scheduling. The base station schedules and transmits data for each carrier, and the terminal transmits A / N feedback for the data transmitted on each carrier. LTE Rel-10 is designed to transmit a maximum of 21 bits of A / N feedback and is designed to transmit A / N feedback and discard channel information when the transmission of A / N feedback and the transmission of channel information overlap in a subframe. LTE Rel-11 is designed to multiplex the A / N feedback and channel information of a cell, and transmits a maximum of 22 bits of A / N feedback and channel information for a cell in the PUCCH Format 3 transmission resources via PUCCH Format 3.

[0066] LTE-13 assumes a scenario with a maximum of 32 serving cells, and a concept has been designed to extend the number of serving cells to a maximum of 32 serving cells using both licensed and unlicensed frequency bands. Furthermore, considering limitations on the number of licensed frequency bands, such as LTE frequencies known as Licensed Assisted Access (LAA), LTE Rel-13 provides LTE service in unlicensed frequency bands such as 5 GHz. LTE carrier aggregation technology is applied to LAA to support LTE cells in licensed frequency bands as P cells and LAA cells in unlicensed frequency bands as S cells. Therefore, as in LTE, feedback generated in LAA cells corresponding to SCells should only be transmitted in PCells, and LAA cells are free to apply downlink and uplink subframes. Unless specifically mentioned in this specification, "LTE" refers to all technologies evolved from LTE, including LTE-A and LAA.

[0067] At the same time, as a post-LTE communication system, the fifth-generation wireless cellular communication system (hereinafter referred to as "5G" or "NR" in the specification) should freely reflect the various needs of users and service providers, and thus should support services that meet various needs.

[0068] Therefore, 5G can meet the requirements of a maximum terminal transmission rate of 20Gbps, a maximum terminal speed of 500km / h, a maximum latency of 0.5 milliseconds, and a terminal access density of 1,000,000 UEs / km. 2 The requirements for 5G services define various 5G services, such as enhanced mobile broadband communication (hereinafter referred to as eMBB), massive machine-type communication (hereinafter referred to as mMTC), and ultra-reliable and low-latency communication (hereinafter referred to as URLLC).

[0069] For example, to provide eMBB in 5G, from the perspective of a base station, a maximum transmission speed corresponding to 20Gbps for a terminal can be provided in the downlink, and a maximum transmission speed corresponding to 10Gbps for a terminal can be provided in the uplink. Furthermore, the average transmission rate actually experienced by the terminal should be increased. To meet these requirements, transmission / reception technologies need to be improved, including further improvements to multiple-input multiple-output (MIMO) transmission technologies.

[0070] Furthermore, to support applications such as the Internet of Things (IoT), mMTC is considered in 5G. mMTC needs to support the access of a large number of terminals within a cell, improve terminal coverage, extend effective battery life, and reduce terminal costs to effectively support IoT. IoT connects various sensors and devices to provide communication functions and therefore should support a large number of terminals within a cell (e.g., 1,000,000 terminals / km). 2 Furthermore, in mMTC, terminals are likely to be located in shadowed areas, such as building basements, or areas not covered by cell coverage due to the nature of the service. Therefore, mMTC requires wider coverage than eMBB. mMTC is also highly likely to be configured with inexpensive terminals, and frequent battery replacements are difficult, thus requiring longer battery life.

[0071] Finally, URLLC is a cellular-based wireless communication for a specific purpose, corresponding to services for remote control of robots or machine equipment, industrial automation, unmanned aerial vehicles, remote health control, and emergency notification, and therefore should provide ultra-low latency and ultra-reliable communication. For example, URLLC should meet a maximum latency of less than 0.5 milliseconds and also requires a latency of equal to or less than 10⁻⁶ milliseconds. 5 The packet error rate. Therefore, URLLC should provide a shorter transmission time interval (TTI) than 5G services (such as eMBB), and in addition, a design is needed to allocate wide resources in the frequency band.

[0072] It is being considered that services used in fifth-generation wireless cellular communication systems should be provided as a single framework. That is, in order to effectively manage and control resources, it is preferable to perform control and transmission such that services are integrated into a single system, rather than operating services independently.

[0073] Figure 2 An example of a service that 5G is considering being delivered through a system is shown.

[0074] exist Figure 2 In 5G, the frequency-time resources 201 used may include a frequency axis 202 and a time axis 203. Figure 2An example is shown where 5G operates eMBB 205, mMTC 206, and URLLC 207 within a single framework. Additionally, as another service considered for implementation in 5G, an enhanced mobile broadcast / multicast service (eMBMS) 208 for providing cellular-based broadcast services can be considered. The services under consideration for 5G (such as eMBB 205, mMTC 206, URLLC 207, and eMBMS 208) can be multiplexed via time-division multiplexing (TDM) or frequency-division multiplexing (FDM) within a single system frequency bandwidth operated by 5G, and spatial multiplexing can also be considered. In the case of eMBB 205, it is preferable to occupy and transmit as much frequency bandwidth as possible within a given time period to provide increased data transmission rates. Therefore, it is preferred that the service of eMBB 205 is time-division multiplexed with another service within the system transmission bandwidth 201, but it is also preferred that the service of eMBB 205 is frequency-division multiplexed with other services within the system transmission bandwidth according to the needs of other services.

[0075] Unlike other services, mMTC 206 requires increased transmission intervals to ensure wider coverage, and this coverage can be ensured by repeatedly sending the same packets within the transmission interval. To simultaneously reduce terminal complexity and terminal cost, the transmission bandwidth in which the terminal can perform reception is limited. Considering the above requirements, mMTC 206 is best frequency-division multiplexed with other services within the transmission system bandwidth 201.

[0076] Preferably, URLLC 207 has a shorter Transmission Time Interval (TTI) compared to other services to meet the ultra-low latency requirements of the service. Furthermore, to meet ultra-reliability requirements, a low coding rate is needed, therefore it preferably occupies a wide frequency bandwidth. When considering the requirements of URLLC 207, it is best to time-division multiplex URLLC 207 with other services within the 5G transmission system bandwidth 201.

[0077] The aforementioned services can have different transmit / receive schemes and transmit / receive parameters to meet service requirements. For example, depending on the service requirements, the service can have different parameter sets (numerology). Parameter sets include the cyclic prefix (CP) length, subcarrier spacing, OFDM symbol length, and transmission time interval (TTI) for communication systems based on Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA). In the example where the service has different parameter sets, eMBMS 208 can have a longer CP than other services. Because eMBMS transmits higher broadcast-based traffic, the same data can be transmitted in all cells. In this case, if the signal received by multiple cells reaches the CP length, the terminal can receive and decode all signals, thus obtaining single-frequency network (SFN) diversity gain. Therefore, even terminals located at cell boundaries can receive broadcast information without any coverage limitations. However, if the CP length is relatively longer than other services, there is a waste due to CP overhead in order to support eMBMS in 5G, and therefore a longer OFDM symbol is required than in the case of other services, which results in a narrower subcarrier spacing compared to other services.

[0078] Furthermore, as an example of services using different parameter sets in 5G, shorter OFDM symbols may be required because a shorter TTI is needed compared to other services, and in the case of URLLC, a wider subcarrier spacing may be required.

[0079] Furthermore, even if services and technologies intended for 5G Phase 2 or beyond are reused on 5G operating frequencies in the future, 5G Phase 2 or beyond technologies and services must still be provided to ensure backward compatibility with previous 5G technologies. This requirement is known as "forward compatibility," and technologies that meet forward compatibility requirements should be considered when initially designing 5G. In the initial LTE standardization steps, forward compatibility considerations were insufficient, and therefore, providing new services within the LTE framework may have been limited. For example, in the case of enhanced machine-type communication (eMTC) applied to LTE release-13, terminals can communicate at only 1.4MHz, regardless of the system bandwidth provided by the serving cell, in order to reduce terminal cost by reducing terminal complexity. However, since eMTC-enabled terminals cannot receive the Physical Downlink Control Channel (PDCCH) transmitted across the entire bandwidth of the legacy system, there is a limitation that signals cannot be received within the time interval of PDCCH transmission. Therefore, 5G communication systems should be designed to coexist effectively with services considered after the 5G communication system is implemented. For forward compatibility with 5G communication systems, resources should be freely allocated and transmitted so that services considered for the future can be freely transmitted within the time-frequency resource zones supported by the 5G communication system. To support forward compatibility in 5G communication systems, 5G terminals should be able to receive instructions on the allocation of reserved resources via at least higher-layer signals.

[0080] A TTI can be defined as a time slot, and in 5G it can consist of either 14 or 7 OFDM symbols. Therefore, with a subcarrier spacing of 15 kHz, a time slot can have a length of 1 millisecond or 0.5 milliseconds. Furthermore, a TTI can be defined as a mini-slot or sub-slot for emergency transmissions and transmissions in unlicensed frequency bands of 5G, and a mini-slot can have OFDM symbols ranging from 1 to (the number of OFDM symbols in that time slot) - 1. If the length of a time slot corresponds to 14 OFDM symbols, the length of a mini-slot can be determined to be one of 1 to 13 OFDM symbols. Alternatively, a TTI can be defined solely by a time slot, rather than defining the terms "time slot" or "mini-slot" separately. Therefore, a time slot can be configured differently for each terminal, and a time slot can have OFDM symbols ranging from 1 to "the number of OFDM symbols in that time slot". The length of a time slot or hour slot can be defined according to a standard, and can be transmitted and received by the terminal via higher-level signals or system information. A time slot or hour slot can be defined with various transmission formats and can be classified into the following formats.

[0081] - DL slot only or full DL slot: Includes only the downlink portion and only supports downlink transmission.

[0082] - A DL-centric time slot: includes a downlink portion, a GP portion, and an uplink portion, and has a greater number of OFDM symbols in the downlink portion than in the uplink portion.

[0083] - UL-centric time slots: include downlink, GP, and uplink portions, with fewer OFDM symbols in the downlink portion than in the uplink portion.

[0084] - UL timeslot only or full UL timeslot: Only includes the uplink portion and only supports uplink transmission.

[0085] The above description only distinguishes time slot formats, but hourly slots can also be classified in the same way. That is, hourly slots can be classified as DL-only hourly slots, DL-centered hourly slots, UL-centered hourly slots, and UL-only hourly slots.

[0086] The transmission interval (or transmission start symbol and transmission end symbol) of uplink transmission can vary depending on the format of the time slot or smaller time slots. Even with reserved resources configured in a time slot, the transmission interval of uplink transmission may change. Furthermore, the coexistence of an uplink control channel with a short transmission interval (hereinafter referred to as short PUCCH in this disclosure) for minimizing transmission delay and an uplink control channel with a long transmission interval for achieving sufficient cell coverage (hereinafter referred to as long PUCCH in this disclosure) in one or more time slots should be considered, as well as the multiplexing of uplink control channels in one or more time slots, such as the transmission of uplink probe signals (similar to SRS). Therefore, when the transmission interval of uplink transmission (such as uplink data channels, uplink control channels, or uplink probe reference signals) varies in units of OFDM symbols, a method is needed to control the power of uplink transmission within the maximum transmission power value of the terminal in order to maintain uplink coverage. In order to meet the reliability requirements of uplink transmission in services that require ultra-reliability, a method is needed to control the power of uplink transmission within the maximum transmission power value of the terminal.

[0087] This disclosure provides a method that, taking into account the number or reliability of OFDM symbols, controls the uplink transmission power within the maximum transmission power value of the terminal in order to maintain uplink coverage and meet the reliability of uplink transmission in time slots or hour slots of the base station and the terminal.

[0088] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Here, it is noted that in the drawings, the same reference numerals denote the same structural elements. Furthermore, detailed descriptions of known functions and configurations that may obscure the subject matter of the present disclosure will be omitted.

[0089] Furthermore, although the following detailed description of embodiments of this disclosure is directed to LTE and 5G systems, those skilled in the art will understand that the main points of this disclosure can also be applied, with minor modifications, to any other communication system with a similar technical background and channel format without substantially departing from the scope of this disclosure.

[0090] The following text describes a 5G system for sending and receiving data in a 5G cell.

[0091] Figure 3 An embodiment of a communication system applying the present disclosure is illustrated. The accompanying drawings show a form in which a 5G system operates, and the solutions proposed in this disclosure can be applied to… Figure 3 The system.

[0092] refer to Figure 3 This illustrates a scenario where a 5G cell 302 is operated by a base station 301 in the network. Terminal 303 is a 5G-capable terminal with a 5G transmit / receive module. Terminal 303 acquires synchronization by transmitting a synchronization signal in the 5G cell 302, receives system information, and then transmits and receives data from base station 301 via the 5G cell 302. In this case, there are no restrictions on the duplexing method for the 5G cell 302. If the 5G cell is a P-cell, uplink control transmissions are performed via the 5G cell 302. In a 5G system, a 5G cell can have multiple serving cells, and a total of 32 serving cells can be supported. It is assumed that BS 301 includes a 5G transmit / receive module (system) in the network and is capable of managing and operating the 5G system in real time.

[0093] Then, refer to Figure 4 This describes the process of base station 301 configuring 5G resources and sending data to and receiving data from 5G-enabled terminal 303 using the resources available for 5G.

[0094] In step 411, base station 301 sends synchronization, system information, and higher-level configuration information for 5G to 5G-enabled terminal 303. Regarding 5G synchronization signals, separate synchronization signals can be sent for eMBB, mMTC, and URCLC using different parameter sets, and a common synchronization signal can be sent using a single parameter set through specific 5G resources. Regarding system information, common system information can be sent using a single parameter set through specific 5G resources, and separate system information can be sent for eMBB, mMTC, and URCLC using different parameter sets. The system information and higher-level configuration information may include configuration information indicating whether data transmission and reception are performed using time slots or hourly slots, the number of OFDM symbols in the time slot or hourly slot, and their parameter sets. Furthermore, when configuring downlink common control channel reception in the UE, the system information and higher-level configuration information may include configuration information related to downlink common control channel reception. When the terminal controls the uplink transmission power, configuration information related to power control may be included.

[0095] In step 412, base station 301 sends data for 5G services to 5G-enabled terminal 303 through 5G resources, and receives data for 5G services from 5G-enabled terminal 303.

[0096] When sending data to and receiving data from a terminal, the base station can send downlink control channels required for scheduling data and insert commands required by the terminal to control uplink transmission into the downlink control channels.

[0097] Subsequently, the process of the 5G-enabled terminal 303 receiving 5G resources from the base station 301 and sending and receiving data through the 5G resources will be described.

[0098] In step 421, the 5G-enabled terminal 303 obtains synchronization from the 5G synchronization signal sent by the base station 301 and receives system information and higher configuration information sent by the base station 301. Regarding the 5G synchronization signal, separate synchronization signals can be sent for eMBB, mMTC, and URCLC using different parameter sets, and a common synchronization signal can be sent using a single parameter set through specific 5G resources. Regarding system information, common system information can be sent using a single parameter set through specific 5G resources, and separate system information can be sent for eMBB, mMTC, and URLLC using different parameter sets. The system information and higher configuration information may include configuration information indicating whether data transmission and reception are performed using time slots or hourly slots, the number of OFDM symbols in the time slot or hourly slot, and their parameter sets. Furthermore, if downlink common control channel reception is configured in the terminal, the system information and higher configuration information may include configuration information related to downlink common control channel reception. When the terminal controls the uplink transmission power, configuration information related to power control may be included.

[0099] In step 422, the 5G-enabled terminal 303 sends data for 5G services to and receives data for 5G services from the base station 301 via 5G resources. When sending data to and receiving data from the base station, the terminal can receive a downlink control channel including data scheduling information, attempt to decode it, and insert the commands required for the terminal to control uplink power into the downlink control channel.

[0100] Figure 5 This illustrates PUCCH transmission in a 5G system.

[0101] Figure 5 The multiplexing of long and short PUCCHs in the frequency region (FDM 500) and the time region (TDM 501) are illustrated. (Reference) Figure 5 Long PUCCH and short PUCCH are transmitted through various OFDM symbols in a single time slot. First, referencing... Figure 5The diagram describes the structure of time slots in which long and short PUCCHs are multiplexed. Reference numerals 520 and 521 indicate time slots centered on the UL, where the uplink is primarily used in time slots that serve as the basic transmission unit of 5G (various names such as "subframe" or "transmission time interval (TTI)" may be used, but "time slot" as the basic transmission unit is used in this disclosure). In a UL-centered time slot, most OFDM symbols are used for the uplink, and all OFDM symbols can be used for uplink transmission, or leading OFDM symbols can be used for downlink transmission. If both downlink and uplink exist in a single time slot, transmission gaps may exist between them. Figure 5 In a time slot, the first OFDM symbol can be used for downlink transmission, such as downlink control channel transmission 502, and the symbol from the third OFDM symbol can be used for uplink transmission. The second OFDM symbol is used for the transmission gap. In uplink transmission, uplink data channel transmission and uplink control channel transmission can be performed.

[0102] The long PUCCH 503 will then be described. The long transmission interval control channel is used to increase cell coverage and can therefore be transmitted using a DFT-S-OFDM scheme used for short carrier transmission instead of OFDM transmission. Therefore, only consecutive subcarriers should be transmitted at this time, and the long transmission interval uplink control channel is configured at the separated positions indicated by reference numerals 508 and 509 to achieve frequency diversity. In the time region, the number of OFDM symbols supporting long PUCCH transmission is 4 to 14. The separation distance 505 in the frequency region should be less than the bandwidth supported by the terminal, and transmission is performed using PRB-1 at the beginning of the time slot, as shown by reference numeral 508, and using PRB-2 at the end of the time slot, as shown by reference numeral 509. A PRB is a Physical Resource Block, which can be the smallest transmission unit in the frequency region and can be defined by 12 subcarriers. Therefore, the frequency distance between PRB-1 and PRB-2 should be less than the maximum bandwidth supported by the terminal, and the maximum bandwidth supported by the terminal can be equal to or less than the system-supported bandwidth 506. Frequency resources PRB-1 and PRB-2 can be configured in the terminal via higher-layer signals, and frequency resources can be mapped to bit fields via higher-layer signals. The frequency resources to be used can be indicated to the terminal via bit fields included in the downlink control channel. Each of the control channels transmitted at the beginning of time slot 508 and at the end of time slot 509 can include uplink control information (UCI) 510 and a terminal reference signal 511, and it is assumed that these two signals are transmitted in a time-division manner with different OFDM symbols.

[0103] Short PUCCH 518 will then be described. Short PUCCHs can be transmitted via both DL-centered and UL-centered time slots, and are typically transmitted via the last symbol or subsequent OFDM symbols of a time slot (e.g., the last OFDM symbol, the penultimate OFDM symbol, or the last two OFDM symbols). Of course, short PUCCHs can be transmitted at random locations within a time slot. Short PUCCHs can be transmitted using one or more OFDM symbols. Figure 5 In this configuration, the short PUCCH is transmitted in the last symbol 518 of the time slot. From a frequency perspective, radio resources for the short PUCCH can be allocated in units of PRBs, and multiple consecutive PRBs can be allocated, or multiple PRBs separated from each other in the frequency band can be allocated. The allocated PRBs should be included in a frequency band equal to or less than the frequency band 507 supported by the terminal. Multiple PRBs as allocated frequency resources can be configured in the terminal through higher-layer signals, the frequency resources can be mapped to bit fields through higher-layer signals, and the frequency resources to be used can be indicated to the terminal through bit fields included in the downlink control channel. The uplink control information 530 and the demodulation reference signal 531 should be multiplexed within a PRB in the frequency band, and can be transmitted in the following ways: every two symbols to a subcarrier, as shown by reference numeral 512; every three symbols to a subcarrier, as shown by reference numeral 513; or every four symbols to a subcarrier, as shown by reference numeral 514.

[0104] Already referenced Figure 5 Examples of performing PUCCH transmissions in various OFDM symbols are described.

[0105] Next, we will refer to Figure 6 Examples of PUSCH and SRS or PUCCH transmissions are described in various OFDM symbols.

[0106] exist Figure 6 In the attached figure, reference numeral 601 indicates a downlink control channel, which can be a terminal common control channel or a terminal specific control channel. The terminal common control channel includes information that can be commonly indicated to (multiple) terminals, such as information regarding the construction of time slots or hour slots. The terminal specific control channel includes terminal-specific information, such as data transmission frequency location information used for uplink data scheduling.

[0107] exist Figure 6 In the figure, reference numeral 602 indicates the uplink data channel, and the data channel includes uplink data and RS required for the transmission of uplink data.

[0108] exist Figure 6 In the figure, reference numeral 603 indicates the uplink control channel, and the control channel includes uplink control information and RS required for the transmission and reception of uplink control information.

[0109] exist Figure 6 In the figure, reference numeral 604 indicates the time and frequency region in which downlink transmission can be performed in a time slot.

[0110] exist Figure 6 In the figure, reference numeral 605 indicates the time and frequency region in which uplink transmission can be performed in a time slot.

[0111] exist Figure 6 In the figure, reference numeral 606 indicates the time and frequency region required for an RF change from downlink to uplink in a time slot.

[0112] exist Figure 6 In the figure, reference numeral 607 indicates the uplink probe reference signal.

[0113] First, within a UL-centered time slot 611 of a time slot interval 608, the transmitted OFDM symbols within the uplink data can vary in units of OFDM symbols based on the start and end OFDM symbols (or interval length) of the uplink data. Figure 6 The time and frequency regions for transmitting downlink control channel 601, uplink data channel 602, and uplink sounding reference signal 607 are shown in time slot 611 centered on UL. Uplink data channel 602 can begin transmission in uplink area 605, and the base station should notify the terminal of the time slot and OFDM symbols for transmitting uplink sounding reference signals in uplink area 605 to avoid transmission conflicts with the sounding reference signals 607 of other terminals. As a result, the OFDM symbol interval for uplink data 602 transmission can be limited to a few OFDM symbols within uplink area 605.

[0114] Next, the variation of the transmitted OFDM symbols within the uplink data within a single UL-only time slot 621 of time slot interval 608 will be described. This is illustrated in... Figure 6The uplink data channel 602 and uplink control channel 603 are transmitted only in UL time slot 621, specifying their time and frequency ranges. Uplink data channel 602 can be transmitted starting from the first OFDM symbol of uplink area 605 and is unaware of the time and frequency ranges of other terminals' uplink control channels 603. Therefore, to avoid conflicts between the time and frequency ranges of uplink control channel 603 and other terminals, the base station should notify the terminal of the OFDM symbols within uplink area 605 in a time slot where the terminal can transmit uplink data channel 602.

[0115] like Figure 6 As described, the number of OFDM symbols transmitted for the uplink data channel, uplink control channel, and uplink sounding reference signal can vary due to the time and frequency regions of the PUSCH, PUCCH, and SRS of the transmitting terminal.

[0116] For reference Figure 5 and Figure 6 If the uplink transmission interval varies in units of OFDM symbols, a method for controlling the uplink transmission power based on the number of transmitted OFDM symbols will be described. Additionally, a method for controlling the uplink transmission power to meet the reliability requirements of uplink transmissions for ultra-reliable services such as URLLC will be described.

[0117] First, the control of uplink transmission power in NR as proposed in this disclosure is described. Specifically, each of the power control methods for PUCCH, PUSCH, and SRS is described based on [Equation 1], [Equation 2], and [Equation 3]. Hereinafter, the control of PUCCH transmission power is primarily described; however, embodiments of this disclosure can be applied to the transmission power of PUSCH or SRS without any limitation.

[0118] In an NR system, the terminal transmits PUCCH, PUSCH, and SRS by controlling the uplink transmission power. The terminal can control the transmission power of the uplink control information of PUCCH to the value calculated using [Equation 1] below.

[0119] [Equation 1]

[0120] P PUCCH (i)=min{P CMAX,c (i), q1(i)}[dBm]

[0121] in,

[0122] q1(i)=P O_PUCCH +PL c +h(nCQI n HARQ ,n SR )+10log 10 (M PUCCH,c (i))+Δ F_PUCCH (F)+Δ TxD (F′)+g(i)

[0123] The terminal can control the transmission power of the uplink data information of PUSCH to the value calculated using the following [Equation 2].

[0124] [Equation 2]

[0125] P PUSCH,c (i)=min{P CMAX,c (i), q2(i)}[dBm

[0126] in,

[0127] q2(i)=P O_PUSCH，c (j)+α C (j)*PL C +10log 10 (M PUSCH，c (i))+Δ TF,c (i)+f c (i)

[0128] The terminal can control the transmission power of the SRS uplink probe reference signal to the value calculated using [Equation 3] below.

[0129] [Equation 3]

[0130] P SRS，c (i)=min{P CMAX，c (i), q3(i)}[dBm]

[0131] in,

[0132] q3(i)=P SRS_OFFSET，c +(m)+10log 10 (M SRS，c )+P O_PUSCH,c (j)+α c (j)*PL c +f c (i)

[0133] In [Equation 1], i represents the index of the time slot, and P CMAX,c (i) represents the maximum transmission power of the terminal in a time slot, P O_PUCCH This represents the sum of the initial terminal-related values ​​and the initial cell-related values ​​configured by the base station, as well as PL. cThis represents the value used to compensate for path loss between the base station and the terminal. Furthermore, in [Equation 1], h(n) CQI ,n HARQ ,n SR ) and Δ F_PUCCH (F) indicates the format of the uplink control information, namely the PUCCH format and the factor configured according to the amount of uplink control information. Δ F_PUCCH (F) is indicated to the terminal by the base station via higher-layer signaling and is configured as a value from a set of multiple integer values ​​according to each format of the uplink control information. Furthermore, h(n) CQI ,n HARQ ,n SR ) and Δ F_PUCCH (F) are complementary to each other, and if set to h(n) CQI ,n HARQ ,n SR If the transmission power of h(n) is too high or too low, then h(n) will be affected. CQI ,n HARQ ,n SR ) can be derived from Δ F_PUCCH (F) Compensation. At this point, based on the PUCCH format requiring the minimum power value, Δ F_PUCCH (F) Set the relative power value required for another PUCCH format. That is, if we assume that PUCCH format A, PUCCH format B, and PUCCH format C are defined for long PUCCH formats in NR, then first determine the absolute power value of PUCCH format A as 0dB, and then allocate the relative power value required according to the format of another uplink control information or the number and type of uplink control information. If the signal-to-noise ratio (SNR) required to obtain a 1% error probability when using PUCCH format A is -6dB, and the SNR required to obtain a 1% error probability when using PUCCH format B is 1dB, then for PUCCH format A, Δ F_PUCCH (F) Set to 0dB, and for PUCCH format B, Δ F_PUCCH (F) Set to 7dB. At this point, the raw value of -6dB required to obtain a 1% error probability in PUCCH format A is reflected in P. O_PUCCH middle.

[0134] h(n CQI ,n HARQ ,n SR The equation for controlling power is based on the number of input bits, according to the format of the uplink control information (i.e., each of the various PUCCH formats in the NR system).

[0135] M PUCCH,c(i)It is an equation that reflects the amount of transmission frequency resources set for PUCCH transmission.

[0136] G(i) is the power value of slot i when the value (δ) is applied, where the value (δ) is sent to be dynamically changed by the PDCCH that can be sent in each slot, and g(i) of slot i can be configured by accumulating the δ value in g(i-1), which is g(i) of the previous slot, or by ignoring the value of the previous slot and only applying the value indicated by the corresponding slot.

[0137] The q1(i) used to control the power transmission of short or long PUCCH can be configured by summing at least one of the above equations, and q1(i) is an equation that should take into account the uplink power of the PUCCH.

[0138] In [Equation 2], i represents the index of the time slot, and P CMAX,c (i) represents the maximum transmission power of the terminal in a time slot, P O_PUCCH,c (j) represents the sum of the initial terminal-related values ​​and the initial cell-related values ​​configured by the base station, and α c (j)*PL c This represents the value used to compensate for path loss between the base station and the terminal. M PUSCH,c (i) will include the amount of transmission frequency resources scheduled for PUSCH transmission. ΔTF,c(i) will include the modulation scheme and the coding rate of the MCS, and f c (i) is the power value of slot i when the value (δ) is applied, where the value (δ) is transmitted to be dynamically changed by the PDCCH transmitted in each slot. The f of slot i c (i) can be achieved by accumulating f c Configured by the δ value in (i-1), f c (i-1) is the f of the previous time slot. c (i), or it can be configured as an absolute value by ignoring the value of the previous time slot and applying only the value indicated by the corresponding time slot.

[0139] In [Equation 3], i represents the index of the time slot, and P CMAX,c (i) represents the maximum transmission power of the terminal in a time slot, P SRS_OFFSET,c and P O_PUCCH,c (j) represents the sum of the initial terminal-related values ​​and the initial cell-related values ​​configured by the base station, and α c (j)*PL c This represents the value used to compensate for path loss between the base station and the terminal. M SRS,c This will include the amount of transmission frequency resources set up for SRS transmission. c(i) is the power value of slot i when the value (δ) is applied, where the value (δ) is transmitted to be dynamically changed by the PDCCH transmitted in each slot, and the f of slot i c (i) can be achieved by accumulating f c Configured by the δ value in (i-1), f c (i-1) is the f of the previous time slot. c (i), or it can be configured as an absolute value by ignoring the value of the previous time slot and applying only the value indicated by the corresponding time slot.

[0140] Next, a method for controlling power based on the number of transmitted symbols of PUCCH, PUSCH, and SRS will be described. In a first embodiment, h(n) is taken as input by the number of transmitted symbols. symbol The equations are added to q1(i), q2(i), and q3(i) to control power based on the number of transmitted symbols for PUCCH, PUSCH, and SRS. This is done in order to control power based on h(n). symbol The power value can be determined not only by equations but also by a table based on the number of OFDM symbols transmitted by PUCCH, PUSCH, and SRS.

[0141] In the second embodiment, coefficients w1, w2, and w3 corresponding to linear values ​​obtained through the transformation of q1(i), q2(i), and q3(i) are multiplied according to the number of transmitted symbols, so as to control the power according to the number of transmitted symbols of PUCCH, PUSCH, and SRS in q1(i), q2(i), and q3(i).

[0142] If we assume that the power values ​​of the PUCCH, PUSCH, and SRS transmissions in all OFDM symbols within a time slot are q1(i), q2(i), and q3(i), respectively, then the power value in one OFDM symbol can be obtained by dividing q1(i), q2(i), and q3(i) by the number of all OFDM symbols. Tables 2 and 3 show available examples of the first and second embodiments, respectively. In this case, there is the advantage of minimizing the variation in transmit power within a time slot.

[0143] [Table 2]

[0144]

[0145]

[0146] [Table 3]

[0147] n_symbol w 1 A'(＝1 / 14) 2 B' 3 C' ... ... 14 D'(＝1)

[0148] On the other hand, in order to maintain uplink coverage based on the transmission power in a time slot, a method can be considered to increase the transmission power to maintain the transmission power in a time slot (even in the transmission of PUCCH, PUSCH, and SRS in one or two OFDM symbols). Available examples of the first and second embodiments are shown in [Table 4] and [Table 5], respectively.

[0149] [Table 4]

[0150] n_symbol h(n_symbol) 1 <![CDATA[A(=P CMAX )]]> 2 B 3 C ... ... 14 D(＝0)

[0151] [Table 5]

[0152] n_symbol w 1 A'(＝1) 2 B' 3 C' ... ... 14 D'(＝1 / 14)

[0153] In the third embodiment, different values ​​corresponding to TPC commands can be applied to δ based on the number of OFDM symbols transmitted for PUCCH, PUSCH, and SRS. Instead of δ, the set of numbers of OFDM symbols transmitted for PUCCH is applied using k*δ, obtained by multiplying δ by a coefficient k. For example, different values ​​of k can be applied to 7. <n symbol ≤14 and 1 <n symbol ≤7. Alternatively, different TPC commands can be applied based on the number of OFDM symbols transmitted via PUCCH, as shown in [Table 6]. For example, set A can be applied to 7. <n symbol ≤14, and set B can be applied to 1 <n symbol ≤7.

[0154] [Table 6]

[0155]

[0156] Subsequently, a method for controlling power when performing PUCCH transmissions for ultra-reliable services (such as URLLC) as required by the terminal is described. The terminal can know the scheduling of URLLC data from the DCI size of the downlink control channel that schedules the downlink data signals received by it, the setting of a specific field, or the individual RNTI of the URLLC. Alternatively, the terminal can know the scheduling of URLLC data from the configuration of higher-layer signals of the URLLC or the configuration of the transmission mode of the URLLC. Therefore, the terminal can know that an uplink control channel for downlink data scheduled by the downlink control channel is being transmitted. Alternatively, the terminal can know that URLLC uplink data transmission should be performed by mapping the terminal's higher packet IP or port number or mapping a specific logical channel ID. Alternatively, if the terminal is scheduled or configured to perform uplink transmissions in a specific uplink resource, the terminal can determine that the uplink is for URLLC. In a fourth embodiment, the terminal adds a field for applying a power value based on a power boost to a table that defines a TPC command and δ, where δ is the power value to be applied. If a field is added for situations requiring a power boost, as shown in [Table 7], and the base station indicates the application of this field, then the field can be applied if the terminal receives the indication for this field. The power increase value for the power boost can be configured by a higher-layer signal, or it can be defined according to the standard as shown in the table below.

[0157] [Table 7]

[0158] TPC command field in DCI δ[dB] 0 -1 1 0 2 1 3 "Power Boost"

[0159] Figure 7 The process of a base station and a terminal according to an embodiment of the present disclosure is illustrated.

[0160] First, the base station process will be described.

[0161] In step 711, the base station sends uplink power control configuration information to the terminal. If PUCCH, PUSCH, and SRS are transmitted at various OFDM symbol intervals or to meet reliability requirements, the uplink power control configuration information includes information that needs to be configured for power control via higher-layer signals and can be transmitted to the terminal via higher-layer signals.

[0162] In step 712, according to this disclosure, the base station sends an uplink power control command to the terminal. If as in Figure 6 In the embodiments described, if PUCCH, PUSCH, and SRS are transmitted at various OFDM symbol intervals or to meet reliability requirements, then the uplink power control command includes the information required to control the power and is transmitted to the terminal via the downlink control channel.

[0163] In step 713, the base station receives from the terminal the uplink channel or uplink signal that was configured or indicated in step 711 or 712 to control the uplink power.

[0164] The terminal procedure will be described next.

[0165] In step 721, the terminal receives uplink power control configuration information from the base station. If PUCCH, PUSCH, and SRS are transmitted at various OFDM symbol intervals or to meet reliability requirements, the uplink power control configuration information includes information that needs to be configured for power control via higher-layer signals and can be received from the base station via higher-layer signals.

[0166] In step 722, according to this disclosure, the terminal receives an uplink power control command from the base station. If as in Figure 6 In the embodiments described, PUCCH, PUSCH, and SRS are transmitted at various OFDM symbol intervals or to meet reliability requirements. In such cases, the uplink power control command includes the information required to control the power and is received from the base station via the downlink control channel.

[0167] In step 723, the terminal sends to the base station the uplink channel or uplink signal that was configured or instructed in step 711 or 712 to control the uplink power.

[0168] Next, Figure 8 A base station apparatus according to this disclosure is shown.

[0169] According to this disclosure Figure 7 The base station process shown and the present disclosure Figure 6 The uplink power control method shown includes a controller 801 that controls and configures the transmission resources required for uplink power control, a 5G control information sending device 805 and a 5G data sending / receiving device 807 that executes transmission to the terminal, a scheduler 803 that schedules 5G data, and a 5G data sending / receiving device 807 that sends 5G data to the 5G terminal and receives 5G data from the 5G terminal.

[0170] Next, Figure 9 A terminal device according to this disclosure is shown.

[0171] According to this disclosure Figure 7 The terminal procedure shown and the present disclosure Figure 6The uplink power control method shown in the diagram involves the controller 901 receiving information and power control commands required for configuring uplink power control from the base station via the 5G control information receiving device 905 and the 5G data transmitting / receiving device 906. The controller 901 controls the power used to transmit 5G data scheduled at resource locations received in the uplink via the 5G data transmitting / receiving device 906 and performs transmission / reception with the 5G base station.

[0172] The embodiments disclosed in the specification and accompanying drawings are merely for ease of description and to aid in a thorough understanding of this disclosure, and are not intended to limit the scope of this disclosure. Therefore, it should be understood that all modifications and alterations, or forms of modifications and alterations, derived from the technical concepts of this disclosure other than those disclosed herein fall within the scope of this disclosure.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: The system information received from the base station includes information associated with the uplink subcarrier spacing, information associated with the number of physical uplink control channel (PUCCH) symbols, and information associated with uplink power control for PUCCH. The power control command for the PUCCH and the physical resource block (PRB) information for the PUCCH are received from the base station on the physical downlink control channel (PDCCH). as well as Based on the uplink subcarrier spacing and the power identified by the number of PUCCH symbols and the power control command for PUCCH, PUCCH is transmitted to the base station on the PRB defined by the PRB information for PUCCH.

2. The method according to claim 1, wherein, The power is identified by a function of parameters relating to information about uplink power control of the PUCCH, parameters relating to the number of PUCCH symbols, and parameters relating to power control commands used for the PUCCH.

3. The method according to claim 1, wherein, The terminal is configured with PRB information for PUCCH received by PDCCH via higher-layer signaling.

4. The method according to claim 1, wherein, The system information also includes information associated with the PDCCH, and Among them, PDCCH is associated with the common control channel.

5. A method performed by a base station in a wireless communication system, the method comprising: System information is sent to the terminal, including information associated with the uplink subcarrier spacing, information associated with the number of physical uplink control channel (PUCCH) symbols, and information associated with uplink power control for PUCCH. The power control command for PUCCH and the physical resource block (PRB) information for PUCCH are sent to the terminal on the physical downlink control channel (PDCCH). as well as Based on the uplink subcarrier spacing, the number of PUCCH symbols, and the power control command for PUCCH, the terminal receives PUCCH on the PRB defined by the PRB information for PUCCH.

6. The method according to claim 5, wherein, The power of the PUCCH depends on parameters related to the uplink power control of the PUCCH, parameters related to the number of PUCCH symbols, and a function related to the parameters of the power control commands used for the PUCCH.

7. The method according to claim 5, wherein, Configure the terminal with PRB information sent by PDCCH for PUCCH via higher-layer signaling. The system information also includes information associated with the PDCCH, and Among them, PDCCH is associated with the common control channel.

8. A terminal in a wireless communication system, the terminal comprising: A transceiver, which is configured to send or receive signals; and The controller is configured as follows: System information is received from the base station, including information associated with uplink subcarrier spacing, information associated with the number of Physical Uplink Control Channel (PUCCH) symbols, and information associated with uplink power control used for PUCCH. On the Physical Downlink Control Channel (PDCCH), power control commands for the PUCCH and Physical Resource Block (PRB) information for the PUCCH are received from the base station. Based on the uplink subcarrier spacing and the power identified by the number of PUCCH symbols and the power control command for PUCCH, PUCCH is transmitted to the base station on the PRB defined by the PRB information for PUCCH.

9. The terminal according to claim 8, wherein, The power is identified by a function of parameters relating to information about uplink power control for PUCCH, parameters relating to the number of PUCCH symbols, and parameters relating to power control commands for PUCCH.

10. The terminal according to claim 8, wherein, The terminal is configured with PRB information for PUCCH received by PDCCH via higher-layer signaling.

11. The terminal according to claim 8, wherein, The system information also includes information associated with the PDCCH, and Among them, PDCCH is associated with the common control channel.

12. A base station in a wireless communication system, the base station comprising: A transceiver, which is configured to send or receive signals; as well as The controller is configured as follows: System information is sent to the terminal, including information associated with the uplink subcarrier spacing, information associated with the number of Physical Uplink Control Channel (PUCCH) symbols, and information associated with uplink power control used for PUCCH. On the Physical Downlink Control Channel (PDCCH), power control commands for the PUCCH and Physical Resource Block (PRB) information for the PUCCH are sent to the terminal. Based on the uplink subcarrier spacing, the number of PUCCH symbols, and the power control command for PUCCH, the terminal receives PUCCH on the PRB defined by the PRB information for PUCCH.

13. The base station according to claim 12, wherein, The power of the PUCCH depends on a function of parameters related to information associated with uplink power control for the PUCCH, a parameter regarding the number of PUCCH symbols, and a parameter regarding the power control commands for the PUCCH.

14. The base station according to claim 12, wherein, The terminal is configured with PRB information sent by PDCCH for PUCCH via higher-layer signaling.

15. The base station according to claim 12, wherein, The system information also includes information associated with the PDCCH, and Among them, PDCCH is associated with the common control channel.

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