Method and device for controlling transmitting power of radio frequency repeater

Abstract

According to one embodiment of the present disclosure, a method of a radio frequency repeater may comprise the steps of: determining one or more repeater power levels of the radio frequency repeater based on a communication configuration environment between the radio frequency repeater and a base station; reporting repeater power level information corresponding to the determined repeater power level to the base station; receiving an uplink transmit power parameter from the base station through high layer signaling; determining the uplink transmission power of the base station based on the repeater power level information and the transmission power parameter; and performing an uplink transmission using the determined uplink transmission power.

Description

Technical Field

[0001] The present disclosure relates to wireless communication technology, and more particularly, to a technology for controlling the transmission power of a wireless repeater in a wireless communication system. Background Art

[0002] In future mobile communications such as 5G New Radio (NR) and 6G, the introduction of network-controlled repeaters (NCRs) that can be controlled by base stations is being actively discussed to overcome the limitations of conventional radio frequency (RF) repeaters that simply amplify and forward received signals.

[0003] In addition to equipment for amplifying and forwarding received signals, the NCR may also include equipment for receiving control signals from the base station and transmitting responses back to the base station. Additional equipment in the NCR may include multiple power amplifiers (PAs) to support carrier aggregation (CA) or dual connectivity (DC) in different frequency bands, multiple transmit and receive point (multi-TRP) functionality, or various types of radio links between base stations, repeaters, and terminals, such as backhaul links, control links, and access links.

[0004] According to the current 5G NR standard, if the terminal has multiple PAs for some of the above purposes, a method is provided to determine the maximum transmit power P for each uplink cell. CMAX , the base station and the terminal can use this method to indicate or determine the uplink transmission power.

[0005] However, according to the current 5G NR standard, the maximum transmit power P for each uplink cell is determined CMAX The traditional method only considers the link between the base station and the terminal. Therefore, it is challenging to directly apply the traditional method that only considers the link between the base station and the terminal to various types of radio links (such as backhaul link, control link and access link) between the base station, relay and the terminal. Summary of the Invention

[0006] Technical issues

[0007] In order to solve the above needs, the present disclosure aims to provide a method for controlling a relay via a network, by providing a method for determining the maximum transmission power P in the uplink cell of the network-controlled relay. CMAX A method and apparatus for improving radio network performance.

[0008] Technical Solution

[0009] According to the present disclosure, a method for a wireless repeater to achieve the above-mentioned purpose may include: determining at least one repeater power level of the wireless repeater based on a communication configuration environment between the wireless repeater and a base station; reporting repeater power level information corresponding to the at least one determined repeater power level to the base station; receiving an uplink transmission power parameter from the base station through high-layer signaling; determining an uplink transmission power for the base station based on the repeater power level information and the uplink transmission power parameter; and performing uplink transmission using the determined uplink transmission power.

[0010] The communication configuration environment may be determined based on at least one of at least one repeater power class of the wireless repeater, a frequency band used by the wireless repeater, or a transmission bandwidth of the wireless repeater.

[0011] The at least one relay power level may include at least one of a first power level applied to the backhaul link or a second power level applied to uplink transmissions of the control link.

[0012] The first power level and the second power level may be reported to the base station simultaneously.

[0013] The method may further include: reporting at least one of the first power level or the second power level to the base station; and reporting a remaining unreported one of the first power level or the second power level to the base station.

[0014] The method may also include: when the uplink transmission power change condition is met, calculating a power reduction value based on the transmission power change situation; and in response to the power reduction value being less than a threshold based on the uplink transmission power parameter, updating the uplink transmission power using the power reduction value.

[0015] The method may further include dropping the uplink transmission in response to the power reduction value being equal to or greater than a threshold value based on the uplink transmit power parameter.

[0016] The change conditions may include at least one of the following situations: when the wireless repeater performs uplink transmission for different uplink cells based on dual connectivity (DC), when the wireless repeater performs different uplink transmissions based on carrier aggregation (CA) of different frequency bands, when the uplink transmission of the backhaul link and the uplink transmission of the control link are frequency division multiplexing (FDM), or when the uplink transmission of the backhaul link and the uplink transmission of the control link are spatial division multiplexing (SDM).

[0017] When the change condition is that the uplink transmission of the return link and the uplink transmission of the control link are FDM, the power reduction value can be calculated as the difference between the maximum available transmission power when the uplink transmission of the return link is performed alone and the maximum transmission power when the uplink transmission of the return link and the uplink transmission of the control link are performed simultaneously through frequency division multiplexing (FDM).

[0018] When the change condition is that the uplink transmission of the return link and the uplink transmission of the control link are SDM, the power reduction value can be calculated as the difference between the maximum available transmission power when the uplink transmission of the return link is performed alone and the maximum transmission power when the uplink transmission of the return link and the uplink transmission of the control link are performed simultaneously through spatial division multiplexing (SDM).

[0019] According to an exemplary embodiment of the present disclosure, a method for a wireless repeater may include: determining at least one repeater power level of the wireless repeater based on a communication configuration environment between the wireless repeater and a base station; reporting repeater power level information corresponding to the at least one determined repeater power level to the base station; receiving an uplink transmit power parameter from the base station through high-layer signaling; in response to a change condition of the uplink transmit power of a control link being met, calculating a power reduction value based on a transmit power change situation, the uplink transmit power of the control link being determined based on the uplink transmit power parameter; and in response to the power reduction value being less than a threshold value based on the uplink transmit power parameter, updating the uplink transmit power of the control link using the power reduction value.

[0020] The method may further include dropping uplink transmissions on the control link in response to the power reduction value being equal to or greater than a threshold value based on the uplink transmit power parameter.

[0021] The change conditions may include at least one of the following situations: when the wireless repeater performs uplink transmission of different uplink cells based on dual connectivity (DC), when the wireless repeater performs different uplink transmissions based on carrier aggregation (CA) of different frequency bands, when the uplink transmission of the backhaul link and the uplink transmission of the control link are frequency division multiplexing (FDM), or when the uplink transmission of the backhaul link and the uplink transmission of the control link are spatial division multiplexing (SDM).

[0022] When the change condition is that the uplink transmission of the return link and the uplink transmission of the control link are FDM, the power reduction value can be calculated as the difference between the maximum available transmission power when the uplink transmission of the return link is performed alone and the maximum transmission power when the uplink transmission of the return link and the uplink transmission of the control link are performed simultaneously through frequency division multiplexing (FDM).

[0023] When the change condition is that the uplink transmission of the return link and the uplink transmission of the control link are SDM, the power reduction value can be calculated as the difference between the maximum available transmission power when the uplink transmission of the return link is performed alone and the maximum transmission power when the uplink transmission of the return link and the uplink transmission of the control link are performed simultaneously through spatial division multiplexing (SDM).

[0024] According to an exemplary embodiment of the present disclosure, the wireless repeater may include a processor, and the processor may cause the wireless repeater to execute:

[0025] Based on the communication configuration environment between the wireless repeater and the base station, at least one repeater power level of the wireless repeater is determined; repeater power level information corresponding to the at least one determined repeater power level is reported to the base station; an uplink transmit power parameter is received from the base station through high-layer signaling; based on the repeater power level information and the uplink transmit power parameter, an uplink transmit power for the base station is determined; and uplink transmission is performed using the determined uplink transmit power.

[0026] The communication configuration environment can be determined based on at least one repeater power level of the wireless repeater, at least one of a frequency band used by the wireless repeater, or a transmission bandwidth of the wireless repeater, and the at least one repeater power level can include at least one of a first power level applied to a backhaul link or a second power level applied to uplink transmission of a control link.

[0027] The processor also enables the wireless repeater to:

[0028] The first power level and the second power level are reported to the base station simultaneously; or at least one of the first power level or the second power level is reported to the base station, and the remaining unreported one of the first power level or the second power level is reported to the base station.

[0029] The processor also enables the wireless repeater to:

[0030] When a change condition for uplink transmit power is met, a power reduction value is calculated based on the transmit power change; in response to the power reduction value being less than a threshold value based on an uplink transmit power parameter, the uplink transmit power is updated using the power reduction value; and in response to the power reduction value being equal to or greater than the threshold value based on the uplink transmit power parameter, the uplink transmission is discarded.

[0031] The change condition may include at least one of the following situations: when the wireless repeater performs uplink transmission for different uplink cells based on dual connectivity (DC), when the wireless repeater performs different uplink transmissions based on carrier aggregation (CA) in different frequency bands, when the uplink transmission of the backhaul link and the uplink transmission of the control link are frequency division multiplexing (FDM), or when the uplink transmission of the backhaul link and the uplink transmission of the control link are spatial division multiplexing (SDM).

[0032] Beneficial effects

[0033] Exemplary embodiments of the present disclosure provide methods for controlling and determining the uplink transmit power of a repeater. Thus, a wireless repeater according to the present disclosure can effectively amplify and forward both its own uplink transmission signals and signals from terminals. Consequently, by applying the methods and apparatus according to the present disclosure, the performance gain of wireless networks controlled by network-controlled repeaters can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a conceptual diagram illustrating an exemplary embodiment of a radio interface protocol structure in a communication system.

[0035] Figure 2 is a conceptual diagram illustrating an exemplary embodiment of time resources for transmitting a radio signal in a communication system.

[0036] Figure 3 is a conceptual diagram illustrating a time difference between a reception timing of an i-th downlink frame and a transmission timing of an i-th uplink frame in an example embodiment of a communication system.

[0037] Figure 4 is a conceptual diagram illustrating an exemplary embodiment of a time / frequency resource grid for a communication system.

[0038] Figure 5 is a conceptual diagram illustrating an exemplary embodiment of a synchronization signal and physical broadcast channel (SS / PBCH) block of a communication system.

[0039] Figure 6 is a sequence diagram illustrating an exemplary embodiment of a random access procedure in a communication system.

[0040] Figure 7 is a conceptual diagram illustrating a first exemplary embodiment of SSB-RO association according to RACH configuration in a communication system.

[0041] Figure 8 is a conceptual diagram illustrating a second exemplary embodiment of SSB-RO association according to RACH configuration in a communication system.

[0042] Figure 9 is a conceptual diagram illustrating an exemplary embodiment of a QCL information transmission process configured and indicated by a TCI state in a communication system.

[0043] Figure 10 is a conceptual diagram illustrating an exemplary embodiment of a TCI state activation / deactivation MAC CE in a communication system.

[0044] Figure 11 is a conceptual diagram illustrating an exemplary embodiment of a TCI status indication MAC CE in a communication system.

[0045] Figure 12 is a conceptual diagram illustrating a slot configuration according to a slot format in a communication system.

[0046] Figure 13 is a sequence diagram illustrating an exemplary embodiment of a UE capability reporting procedure in a communication system.

[0047] Figure 14a and Figure 14b is a conceptual diagram for describing a first exemplary embodiment of a user plane protocol stack structure and a control plane protocol stack structure in a communication system.

[0048] Figure 15 is a conceptual diagram showing an example of a network configuration implemented by the IAB function.

[0049] Figure 16 is a conceptual diagram illustrating deployment of commercial RF repeaters.

[0050] Figure 17 is a conceptual diagram illustrating protocol stacks of a control plane and a user plane of a wireless communication system including an RF repeater.

[0051] Figure 18 is a conceptual diagram illustrating a protocol stack of a control plane of an advanced relay according to an exemplary embodiment of the present disclosure.

[0052] Figure 19 This is a conceptual diagram used to describe cell-specific configuration, terminal-specific configuration, and indication information within a specific given time according to TDD configuration.

[0053] Figure 20 is a conceptual diagram used to describe the deployment of network control repeaters.

[0054] Figure 21 A conceptual diagram used to describe the amplifier structure in NCR and the RF chain configuration based on it.

[0055] Figure 22 is a conceptual diagram for describing an amplifier structure in NCR and another RF chain configuration based thereon.

[0056] Figure 23 is a conceptual diagram for describing an amplifier structure in NCR and another RF chain configuration based thereon.

[0057] Figure 24 is a conceptual diagram for describing an amplifier structure in NCR and another RF chain configuration based thereon.

[0058] Figure 25 is a flowchart for describing a case where a relay needs to adjust uplink transmission power in a specific cell during NR DC operation according to an exemplary embodiment of the present disclosure.

[0059] Figure 26 is a flowchart for describing a case where a relay needs to adjust uplink transmission power in a specific cell during EN DC or NE DC operation according to an exemplary embodiment of the present disclosure.

[0060] Figure 27 is a flowchart for describing a case where a relay needs to adjust specific uplink transmission power due to sharing of some PAs between backhaul link uplink transmission and control link uplink transmission according to an exemplary embodiment of the present disclosure.

[0061] Figure 28 is a flowchart for describing a case where a relay needs to adjust specific uplink transmission power when some PAs are shared between backhaul link uplink transmission and control link uplink transmission according to an exemplary embodiment of the present disclosure.

[0062] Figure 29 is a block diagram illustrating a base station according to an exemplary embodiment of the present disclosure.

[0063] Figure 30 is a block diagram illustrating a repeater according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0064] Although the present disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and will be described in detail herein. However, it should be understood that the present disclosure is not intended to be limited to the particular forms disclosed, but rather, the present disclosure is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure. Throughout the description of the figures, like numbers represent like elements.

[0065] It should be understood that although terms such as "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are merely used to distinguish elements from each other. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of this disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0066] In exemplary embodiments of the present disclosure, “at least one of A and B” may refer to “at least one of A or B” or “at least one of one or more combinations of A and B.” Furthermore, “one or more of A and B” may refer to “one or more of A or B” or “one or more of one or more combinations of A and B.”

[0067] In the present disclosure, “(re)transmit” may refer to “transmit”, “retransmit” or “transmit and retransmit”, “(re)configuration” may refer to “configuration”, “reconfiguration” or “configuration and reconfiguration”, “(re)connection” may refer to “connect”, “reconnect” or “connect and reconnect”, and “(re)access” may mean “access”, “reaccess” or “access and reaccess”.

[0068] It should be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. Conversely, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements. Other words used to describe the relationship between elements should be understood in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.).

[0069] The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an", and "the" also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprises", "comprising", "includes", and / or "comprising" when used herein represent the presence of the features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0070] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It should also be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless otherwise explicitly defined herein.

[0071] The preferred embodiments of the present disclosure will be described in more detail below in conjunction with the accompanying drawings. In describing the present disclosure, in order to facilitate overall understanding, the same elements in the drawings are denoted by the same reference numerals, and repeated descriptions of the same elements are omitted.

[0072] The following describes a communication network to which the exemplary embodiments of the present disclosure are applied. The communication network to which the exemplary embodiments of the present disclosure are applied is not limited to the following description; the exemplary embodiments of the present disclosure can be applied to various communication networks. Here, the term "communication network" can have the same meaning as a communication system. A communication network can refer to a wireless communication network, and a communication system can refer to a wireless communication system.

[0073] In the present disclosure, “configuration of an operation (e.g., a transmission operation)” may refer to sending “control information (e.g., information element, parameter) for the operation” and / or “information instructing to perform the operation” by signaling. “Information element (e.g., parameter) is configured” may refer to sending the corresponding information element by signaling. In the present disclosure, signaling may be at least one of the following: system information (SI) signaling (e.g., transmission of system information block (SIB) and / or master information block (MIB)), RRC signaling (e.g., transmission of RRC parameters and / or higher layer parameters), MAC control element (CE) signaling, or PHY signaling (e.g., transmission of downlink control information (DCI), uplink control information (UCI), and / or sidelink control information (SCI)).

[0074] Throughout this disclosure, a network may include, for example, wireless Internet (such as Wireless Fidelity (WiFi)), mobile Internet (such as Wireless Broadband Internet (WiBro) or Worldwide Interoperability for Microwave Access (WiMax)), 2G mobile communication networks (such as Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA)), 3G mobile communication networks (such as Wideband Code Division Multiple Access (WCDMA) or CDMA2000), 3.5G mobile communication networks (such as High Speed ​​Downlink Packet Access (HSDPA) or High Speed ​​Uplink Packet Access (HSUPA)), 4G mobile communication networks (such as Long Term Evolution (LTE) networks or LTE-Advanced networks), 5G mobile communication networks, beyond 5G (B5G) mobile communication networks (e.g., 6G mobile communication networks), and the like.

[0075] Throughout this disclosure, a terminal may refer to a mobile station, mobile terminal, user station, portable user station, user equipment, access terminal, etc., and may include all or part of the functions of a terminal, mobile station, mobile terminal, user station, mobile user station, user equipment, access terminal, etc.

[0076] Here, a desktop computer, a laptop computer, a tablet computer, a wireless phone, a mobile phone, a smart phone, a smart watch, a smart glasses, an e-book reader, a portable multimedia player (PMP), a portable game console, a navigation device, a digital camera, a digital multimedia broadcasting (DMB) player, a digital recorder, a digital audio player, a digital image recorder, a digital picture player, a digital video recorder, a digital video player, etc. with communication capabilities can be used as a terminal.

[0077] Throughout this disclosure, a base station may refer to an access point, a radio access station, a Node B (NB), an evolved Node B (eNB), a base station transceiver, a mobile multi-hop relay (MMR)-BS, etc., and may include all or part of the functions of a base station, an access point, a radio access station, a NB, an eNB, a base station transceiver, an MMR-BS, etc.

[0078] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. In describing the present invention, in order to facilitate overall understanding, the same reference numerals are used for the same elements in the drawings, and repeated descriptions of the same elements are omitted.

[0079] Specifically, the present disclosure described below provides a method and apparatus for controlling the transmit power of a network controller repeater (NCR). The term "network repeater" is used for convenience of description. In actual applications, it can refer to various terms such as "intelligent repeater," "intelligent transponder," and "controllable repeater."

[0080] Figure 1 is a conceptual diagram illustrating an exemplary embodiment of a radio interface protocol structure in a communication system.

[0081] refer to Figure 1 , an exemplary embodiment of a radio interface protocol structure 100 of a communication system may be configured to include a radio resource control (RRC) layer 110 , a medium access control (MAC) layer 120 , a physical (PHY) layer 130 , and the like. Figure 1The exemplary embodiment of the radio interface protocol structure 100 shown in the figure may correspond to various exemplary embodiments of an interface, such as an interface between a terminal and a base station, an interface between an IAB node distributed unit (IAB-DU) and an IAB node mobile terminal (IAB-MT) in an integrated access backhaul (IAB) network, an interface between an IAB-DU and a lower-level node, an interface between an IAB-MT and an upper-level node, an interface between multiple terminals, and the like.

[0082] In the vicinity of the PHY layer 130, an RRC layer 110 and a MAC layer 120, etc., may be provided above the PHY layer 130. For example, the MAC layer 120 may be provided above the PHY layer 130. The RRC layer 110 may be provided above the MAC layer 120.

[0083] The MAC layer 120 may be connected to a higher layer (e.g., the RRC layer 110) through a logical channel 115. The PHY layer 130 may be connected to the higher MAC layer 120 through a transport channel 125. The PHY layer 130 may transmit control information or measurement information 150 to the RRC layer 110, and receive control information or measurement information 150 from the RRC layer 110.

[0084] The PHY layer 130 may be referred to as "Layer 1" or "L1." The MAC layer 120 may be referred to as "Layer 2" or "L2." The RRC layer 110 may be referred to as "Layer 3" or "L3." The RRC layer 110 and the MAC layer 120 may be collectively referred to as "higher layers."

[0085] In the present disclosure, "L1 signaling" refers to signaling such as downlink control information (DCI) transmitted on the physical downlink control channel (PDCCH), uplink control information (UCI) transmitted on the physical uplink control channel (PUCCH), and sidelink control information (SCI) transmitted on the physical sidelink control channel (PSCCH), which are channels of the physical layer 130. Similarly, in the present disclosure, "higher layer signaling" may include L2 signaling transmitted through the MAC control element (CE), L3 signaling transmitted through RRC signaling, etc.

[0086] Specifically, for the convenience of description, although in the present disclosure Figure 1 Information omitted in the L2 signaling but included in the interface (e.g., F1, NG interface, etc.) between base stations or between base station components such as a distributed unit (DU) and a central unit (CU) may also be collectively referred to as high-layer signaling together with L2 signaling or L3 signaling.

[0087] In a communication system that applies 5G communication technology, one or more numerical configurations in Table 1 can be used for various purposes, such as reducing inter-carrier interference (ICI) according to frequency band characteristics, reducing latency according to service characteristics, etc.

[0088] [Table 1]

[0089] μ <![CDATA[Δf=2 μ ·15[kHz]]]> cyclic prefix 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0090] Table 1 is merely an example for ease of description, and exemplary embodiments of numerical configurations used in a communication system are not limited thereto. Each numerical configuration μ may correspond to information about a subcarrier spacing (SCS) Δf and a cyclic prefix (CP). The terminal may identify the numerical configuration μ and CP value applied to a downlink bandwidth part (BWP) or uplink BWP based on higher-layer parameters such as subcarrierSpacing and cyclicPrefix.

[0091] Figure 2 is a conceptual diagram illustrating an exemplary embodiment of time resources for transmitting a radio signal in a communication system.

[0092] refer to Figure 2 The time resources for transmitting radio signals in the communication system 200 may include one or more The subframe 220 includes one or more The subframe 220 of the time slot contains 14 In this case, according to the numerical configuration, as and In the case of normal CP, the value according to the following Table 2 may be used, and in the case of extended CP, the value according to the following Table 3 may be used. OFDM symbols included in a time slot may be classified as "downlink", "flexible", or "uplink" through higher layer signaling or a combination of higher layer signaling and L1 signaling.

[0093] [Table 2]

[0094]

[0095]

[0096] [Table 3]

[0097]

[0098] In a 5G NR communication system, a frame 230 may have a length of 10 ms, and a subframe 220 may have a length of 1 ms. Each frame 230 may be divided into two half-frames of equal length. The first half-frame (i.e., half-frame 0) may consist of subframes #0 to #4, and the second half-frame (i.e., half-frame 1) may consist of subframes #5 to #9. A carrier may include a set of frames for uplink (i.e., uplink frames) and a set of frames for downlink (i.e., downlink frames).

[0099] Figure 3 is a conceptual diagram illustrating a time difference between a reception timing of an i-th downlink frame and a transmission timing of an i-th uplink frame in an example embodiment of a communication system.

[0100] refer to Figure 3 The time difference between the reception timing of the i-th downlink frame 300 and the transmission timing of the i-th uplink frame 310 can be referred to as T TA 320. Therefore, the terminal can receive the downlink frame #i 300 in advance by T TA The uplink frame #i 310 starts to be transmitted at the time T TA It can be called timing advance or timing adjustment TA. The base station can instruct the terminal to change T through high-level signaling or L1 signaling. TA The terminal can be configured to apply T TA , which is applied by defining it as T TA =(N TA +N TA,offset )T c In the case of 5G NR, T c Can be defined as Δf max It can be defined as Δf max =480kHz, N f It can be defined as N f =4096, N TA,offset It can be a value set by L3 signaling, N TA It can be T indicated by the following formula 1 according to L2 signaling A Value determines the value.

[0101] [Formula 1]

[0102]

[0103] Here, N TA,offset and N TA The description may be an example for a specific situation, and there may be various other options, but in order not to obscure the subject of the description, the present disclosure may not list all possible situations.

[0104] Figure 4 is a conceptual diagram illustrating an exemplary embodiment of a time / frequency resource grid for a communication system.

[0105] refer to Figure 4 , the time / frequency resource grid 400 of the communication system may have subcarriers and OFDM. A resource grid can be defined for each numerical configuration and each carrier. In this case, It can indicate the location of the common resource block (CRB) indicated by higher layer signaling. It can indicate the number of resource blocks (RBs) starting from the CRB, that is, the carrier bandwidth. and / or It may have a different value for each link direction (eg, uplink, downlink, or sidelink) or each numerical configuration μ. Here, if necessary, the numerical configuration μ may be referred to by other terms, such as an SCS configuration.

[0106] Each element in the resource grid for antenna port p and SCS configuration μ may be referred to as a resource element (RE) 420 and may be a p,μ In this case, k can be the frequency axis index and l can indicate the symbol position on the time axis. RE(k,l) p,μ Can correspond to the complex value used to transmit the physical channel or signal A RB 410 can be defined as a continuous subcarriers.

[0107] The 5G NR communication system introduces the concept of BWP to reduce the high implementation complexity and power consumption of terminals due to the expansion of carrier bandwidth compared to 3G / 4G communication systems. A BWP can be composed of consecutive CRBs. The starting RB position of the BWP is and the number of RBs that make up the BWP Formula 2 and Formula 3 can be satisfied.

[0108] [Formula 2]

[0109]

[0110] [Formula 3]

[0111]

[0112] A terminal can be configured with up to four downlink BWPs within a component carrier (CC), and only one downlink BWP can be activated at a time. The terminal cannot receive the Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Channel State Information Reference Signal (CSI-RS), etc. outside the activated BWP.

[0113] Each terminal can be configured with up to four uplink BWPs within a CC, and only one uplink BWP can be activated at a time. The terminal cannot transmit the Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), Sounding Reference Signal (SRS), etc. outside the activated BWP.

[0114] Figure 5 is a conceptual diagram illustrating an exemplary embodiment of a synchronization signal and physical broadcast channel (SS / PBCH) block of a communication system.

[0115] refer to Figure 5 , the SS / PBCH block 500 of the communication system can be configured with a primary synchronization signal (PSS) sent in the 127 subcarriers in the middle of the first OFDM symbol, a secondary synchronization signal (SSS) sent in the 127 subcarriers in the middle of the third OFDM symbol, and a physical broadcast channel (PBCH) sent in the second, third and fourth OFDM symbols. The PBCH occupying the largest bandwidth can be sent through 20 RBs (which can be 3.6MHz based on a 15kHz SCS). The base station transmits one SSB by applying the same beam. When the number of base station antennas increases or multiple beams need to be operated (such as applying one or more analog beams to support high frequencies), the base station can support multi-beam operation by transmitting multiple SSBs. Here, the term "beam" may have multiple expressions in actual applications, such as transmit precoding or spatial transmission (TX) filter. However, in order to avoid confusing the main purpose of this specification, "beam" will be used as a unified term below.

[0116] For example, a base station may transmit multiple SSBs 530, 540, 550, and 560 to represent multiple beams (e.g., beam #1, beam #2, beam #3, and beam #4). In this case, it is possible to transmit one or more SSBs in a time slot according to a predetermined pattern based on each numerical configuration. SSBs 530, 540, 550, and 560 to which different beams are applied may be bundled into a set by being included in an SS burst 520. When monitoring SSBs, a terminal may assume a half-frame window of 5 ms in length. An SS burst set 515 configured by higher-layer signaling within a half-frame may include one or more SS bursts 520. If the RRC configuration value is unknown or unavailable when performing initial access (IA), the terminal may assume that the period of the SS burst set 510 is 20 ms to receive or measure the SSBs. For example, the terminal may receive the SSBs with reference to SSB configuration information that is the same as or similar to that shown in Tables 4 and 5.

[0117] [Table 4]

[0118]

[0119] [Table 5]

[0120]

[0121]

[0122] Figure 6 is a sequence diagram illustrating an exemplary embodiment of a random access procedure in a communication system.

[0123] refer to Figure 6 In a random access procedure of the communication system 600, the terminal 615 may transmit a physical random access channel (PRACH) preamble, which may be referred to as "Msg1" (S620). The transmission of the PRACH preamble may determine a random access radio network temporary identifier (RA-RNTI). In this case, the RA-RNTI may be calculated using Formula 4.

[0124] [Formula 4]

[0125]

[0126] In formula 4, s id It can be the index of the first OFDM symbol of the corresponding PRACH opportunity (e.g. 0≤s id <14), t id It can be the index of the first time slot of the PRACH opportunity in the system frame (for example, 0≤t id <80), f idIt can be the index of the PRACH opportunity in the time domain (e.g. 0≤f id <8), and It can be a value according to the uplink carrier type used for preamble transmission (e.g., 0 for a normal uplink carrier, 1 for a supplementary uplink carrier).

[0127] In Equation 4, s id It can be the index of the first OFDM symbol of the corresponding PRACH opportunity (e.g. 0≤s id <14), t id It can be the index of the first time slot of the PRACH opportunity in the system frame (for example, 0≤t id <80), f id It can be the index of the PRACH opportunity in the time domain (e.g. 0≤f id <8), and It can be a value according to the uplink carrier type used for preamble transmission (e.g., 0 for a normal uplink carrier, 1 for a supplementary uplink carrier).

[0128] Before the terminal transmits the PRACH preamble, the terminal may obtain at least part of the following information by receiving system information from the base station on the PBCH or receiving RRC signaling from the base station.

[0129] -PRACH preamble format.

[0130] - Time / frequency resource information used for RACH transmission.

[0131] - Index into the logical root sequence list.

[0132] - Circular shift NCS.

[0133] - Collection type (unrestricted, restricted collection A, restricted collection B).

[0134] Reference again Figure 6As a second procedure, the base station may provide the terminal with a random access response (RAR), which may be referred to as "Msg2" (S630). Specifically, when the base station receives the PRACH preamble from the terminal in step S620, the base station may calculate the RA-RNTI based on Formula 4 and send DCI by scrambling using the RA-RNTI. The terminal may monitor the PDCCH scrambled with the RA-RNTI in the Type 1 PDCCH Common Search Space (CSS) within a period included in the RACH response window configured by the higher layer. The terminal may receive the PDCCH (or DCI sent from the base station via the PDCCH) and may decode the PDCCH (or DCI). If the terminal successfully decodes the PDCCH (or DCI), the terminal may decode the PDSCH containing the RAR sent from the base station in step S630. If the terminal successfully decodes the RAR, the terminal may identify whether the RA preamble identifier (RAPID) in the RAR matches the RAPID pre-assigned to the terminal.

[0135] As a third procedure, the terminal may transmit a PUSCH to the base station, which may be referred to as "Msg3" (S640). To this end, the terminal may determine whether to apply transform precoding to the transmission of the PUSCH (i.e., whether to apply discrete Fourier transform (DFT)-s-OFDM-based transmission or OFDM-based transmission) based on a higher-layer parameter (e.g., msg3-transformPrecoding). In addition, the terminal may determine the SCS used to transmit the PUSCH based on a higher-layer parameter (e.g., msg3-scs). In this case, the PUSCH of Msg3 may be transmitted through the serving cell to which the PRACH has been transmitted.

[0136] As a fourth procedure, the base station may send a contention resolution message to the terminal, which may be referred to as "Msg4" (S650). The terminal may start a timer to receive the contention resolution message and may monitor the PDCCH scrambled with the temporary cell RNTI (TC-RNTI) in the Type 1 PDCCH CSS until the timer expires. If the terminal successfully decodes the PDCCH, the terminal may decode the corresponding PDSCH containing the MAC CE and set the TC-RNTI to the cell RNTI (C-RNTI). After successfully decoding Msg4, the terminal may report a hybrid automatic repeat request (HARQ) positive acknowledgement (ACK) to the base station and may report to the base station whether the RACH procedure is successful (S660).

[0137] A RACH opportunity (RO) may refer to the time and frequency resources designated for receiving a RACH preamble, and a terminal may use the RO for PRACH transmission. As described above, in 5G NR, multiple SSBs may be associated with different beams to implement multi-beam operation, and the terminal may measure multiple SSBs and select the best SSB (i.e., best beam) based on one of various schemes, such as reference signal received power (RSRP), reference signal received quality (RSRQ), signal-to-noise ratio (SNR), signal-to-noise / interference ratio (SNIR), etc. The terminal may then determine the beam to be used for PRACH transmission (i.e., TX spatial filter) based on the beam used when receiving the best SSB (i.e., RX spatial filter). In this case, a relationship between the SSB and the RO may be established to allow the base station or network to know which SSB (i.e., beam) the terminal has selected. Through this relationship, the base station may learn the SSB (i.e., beam) selected by the terminal based on the RO at which the terminal transmits the PRACH. For example, the relationship between the SSB and the RO may be determined with reference to higher-level configurations identical or similar to those shown in Tables 6 and 7.

[0138] [Table 6]

[0139]

[0140] [Table 7]

[0141]

[0142] Figure 7 is a conceptual diagram illustrating a first exemplary embodiment of SSB-RO association according to RACH configuration in a communication system.

[0143] refer to Figure 7 In the SSB-RO mapping relationship according to the RACH configuration, in a specific frequency band, N SSBs 710-1 to 710-n having time resources separated from each other can be mapped one-to-one to ROs 720-1 to 720-n having time resources separated from each other. For example, if the higher layer parameter msg1-FDM is set to 1 (i.e., msg1-FDM=1) and the higher layer parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB is set to 1 (e.g., ssb-perRACH-OccasionAndCB-PreamblesPerSSB=1), then N different SSBs 710-1 to 710-n can be mapped one-to-one to N different ROs 720-1 to 720-n.

[0144] Figure 8 is a conceptual diagram illustrating a second exemplary embodiment of SSB-RO association according to RACH configuration in a communication system.

[0145] refer to Figure 8 In the SSB-RO mapping relationship according to the RACH configuration, in the first frequency band, SSBs 810-1, 810-3, 810-5, ..., and 810-(n-1) having time resources separated from each other can be mapped one-to-one to ROs 820-1, 820-3, 820-5, ..., and 820-(n-1) having time resources separated from each other. In addition, in the second frequency band, SSBs 810-2, 810-4, 810-6, ..., and 810-n having time resources separated from each other can be mapped one-to-one to ROs 820-2, 820-4, 820-6, ..., and 820-n having time resources separated from each other. For example, if the higher layer parameter msg1-FDM is set to 2 (i.e., msg1-FDM=2) and the higher layer parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB is set to 2 (e.g., ssb-perRACH-OccasionAndCB-PreamblesPerSSB=2), then the N different SSBs 810-1 to 810-n can be mapped one-to-one to N different ROs 820-1 to 820-n of frequency division multiplexing (FDM) in the frequency domain.

[0146] At the same time, the 5G NR communication system can support the DCI format shown in Table 8 based on Release 16.

[0147] [Table 8]

[0148]

[0149] DCI may contain downlink control information for one or more cells and may be associated with an RNTI. DCI may be encoded in the following order: 1) information element multiplexing, 2) cyclic redundancy check (CRC) addition, 3) channel coding, and 4) rate matching, and decoding may also be performed taking into account the above steps. In the above description, "a certain DCI is associated with an RNTI" may mean that the CRC check bits of the DCI are scrambled with the RNTI. Referring to Table 8, a certain DCI may contain scheduling information for one or more PUSCHs for a specific cell. For example, the CRC of DCI format 0_1 ​​may be scrambled with C-RNTI, configured scheduling RNTI (CS-RNTI), semi-persistent CSI RNTI (SP-CSI-RNTI), or modulation and coding scheme cell RNTI (MCS-C-RNTI). DCI format 0_1 ​​may contain at least one of the following information.

[0150] □ Identifier of DCI format (1 bit): an indicator indicating the UL DCI format, which is always set to 0 for DCI format 0_1.

[0151] □ Carrier indicator (0 or 3 bits): an indicator indicating the CC scheduled by the corresponding DCI.

[0152] □DFI flag (0 or 1 bit): Configuration Grant Downlink Feedback Information (CG-DFI) indicator.

[0153] If DCI format 0_1 ​​is used for CG-DFI indication (when the DFI flag is set to 1), at least one of the following fields may be used:

[0154] HARQ-ACK bitmap (16 bits), where the HARQ process index is mapped in the bitmap in ascending order from the MSB to the LSB of the bitmap. For each bit in the bitmap, a value of 1 indicates an ACK and a value of 0 indicates a NACK.

[0155] □ TPC command for scheduled PUSCH (2 bits).

[0156] □ All remaining bits in DCI format 0_1 ​​are set to zero.

[0157] If DCI format 0_1 ​​is not used for CG-DFI indication (when there is no DFI flag field or the DFI flag field is set to 0), at least one of the following fields may be used:

[0158] □UL / SUL indicator (0 or 1 bit): Supplementary UL indicator.

[0159] □ Bandwidth part indicator (0, 1 or 2 bits): An indicator indicating the BWP to be activated among the uplink BWPs configured for the terminal.

[0160] □Frequency domain resource allocation: indicator used to allocate frequency domain resources.

[0161] □Time domain resource allocation: indicator used to allocate time domain resources.

[0162] □Frequency hopping flag (0 or 1 bit): Frequency axis hopping indicator.

[0163] □ Modulation and coding scheme (5 bits).

[0164] □ New Data Indicator (NDI): An indicator indicating whether the allocated data is new data or retransmitted data.

[0165] □ Redundancy Version (RV): An indicator indicating the RV value when channel coding is applied to allocated data.

[0166] □HARQ process number (4 bits): an indicator indicating the HARQ process to be allocated to the scheduled data.

[0167] □ TPC command for scheduled PUSCH (2 bits): TPC indicator.

[0168] □SRS resource indicator: aperiodic SRS resource selection indicator.

[0169] □ Precoding information and number of layers: An indicator indicating the precoding and number of transmission layers to be used in PUSCH transmission.

[0170] □ Antenna Port: Indicator of the uplink antenna port to be used for PUSCH transmission.

[0171] □SRS request: an indicator indicating whether to transmit aperiodic SRS.

[0172] □ CSI request: an indicator indicating whether and how to report channel state information.

[0173] □ PTRS-DMRS association: An indicator showing the relationship between the uplink Phase Noise Tracking Reference Signal (PTRS) antenna port and the Demodulation Reference Signal (DMRS) antenna port.

[0174] □ DMRS sequence initialization: an indicator for DMRS sequence initialization value during OFDM-based uplink transmission.

[0175] □ UL-SCH indicator: an indicator indicating whether the uplink shared channel (UL-SCH) is included in the PUSCH (PUSCH that does not include UL-SCH needs to include CSI).

[0176] □Open-loop power control parameter setting indication: an indicator indicating a set of open-loop power control (OPLC) parameter settings.

[0177] □ Priority indicator: Uplink transmission priority indicator.

[0178] □Invalid symbol mode indicator: An indicator indicating whether the invalid symbol mode configured by the higher layer is applied.

[0179] As another example, the CRC of DCI format 1_1 may be scrambled with C-RNTI, CS-RNTI, or MCS-C-RNTI, and DCI format 1_1 may include at least one of the following information.

[0180] □ Identifier for DCI format (1 bit): an indicator indicating a DL DCI format, which is always set to 1 in the case of DCI format 1_1.

[0181] □ Carrier indicator (0 or 3 bits): an indicator indicating the CC scheduled by the corresponding DCI.

[0182] □ Bandwidth part indicator (0, 1 or 2 bits): An indicator indicating the BWP to be activated among the downlink BWPs configured for the terminal.

[0183] □Frequency domain resource allocation: indicator used to allocate frequency domain resources.

[0184] □Time domain resource allocation: indicator used to allocate time domain resources.

[0185] □PRB bundling size indicator: an indicator indicating the type (ie static or dynamic) and size of PRB bundling.

[0186] □Rate matching indicator: an indicator indicating the rate matching mode configured by the higher layer.

[0187] □ ZP CSI-RS trigger: an indicator for applying aperiodic zero power (ZP) CSI-RS.

[0188] □ 'Modulation and coding scheme', 'New data indicator' and 'Redundancy version' fields of transport block 1.

[0189] □ 'Modulation and coding scheme', 'New data indicator' and 'Redundancy version' fields of transport block 2.

[0190] □HARQ process number: an indicator indicating the HARQ process to be allocated to the scheduled data.

[0191] □ Downlink Allocation Index: DAI indicator used for HARQ-ACK codebook generation in TDD operation.

[0192] □ TPC command for scheduled PUCCH: Power control indicator for PUCCH transmission.

[0193] □ PUCCH resource indicator: An indicator indicating the PUCCH resource used to transmit HARQ-ACK information for an allocated PDSCH or a predetermined PDSCH set.

[0194] □PDSCH-to-HARQ_feedback timing indicator: an indicator indicating the time axis offset between the allocated PDSCH and PUCCH.

[0195] □ Antenna Port: An indicator indicating the antenna port to be used for PDSCH transmission / reception.

[0196] □ Transmission Configuration Indication: An indicator indicating transmission configuration information (TCI) to be used for PDSCH transmission and reception.

[0197] □SRS request: an indicator indicating whether to transmit aperiodic SRS.

[0198] □DMRS sequence initialization: an indicator of the DMRS sequence initialization value used for PDSCH transmission and reception.

[0199] □ Priority indicator: PDSCH reception priority indicator.

[0200] For another example, certain DCI formats can be used to deliver the same control information to one or more terminals. For example, the CRC of DCI format 2_3 can be scrambled using the transmit power control-sounding reference signal-RNTI (TPC-SRS-RNTI) and can include at least one of the following information.

[0201] □ Block number 1, block number 2, ..., block number B: indicators indicating a resource region to which DCI format 2_3 is applied. The start of a block is configured by a higher-layer parameter startingBitOfFormat2-3 or startingBitOfFormat2-3SUL-v1530.

[0202] -When the higher-layer parameter srs-TPC-PDCCH-Group is set to a type A terminal for uplink transmission without PUCCH and PUSCH, or for uplink transmission in which SRS power control does not depend on PUSCH power control, a block is configured by the higher layers and the following fields are defined for the block.

[0203] □ SRS request (0 or 2 bits): aperiodic SRS transmission indicator.

[0204] □ TPC command number 1, TPC command number 2, ..., TPC command number N: indicators indicating uplink power control to be applied to the UL carrier indicated by the higher layer parameter cc-IndexInOneCC-Set.

[0205] -When the higher-layer parameter srs-TPC-PDCCH-Group is set to type B and the terminal performs uplink transmission without PUCCH and PUSCH, or the SRS power control does not depend on the uplink transmission of PUSCH power control, one or more blocks can be configured by the higher layer and the following fields can be defined for each block.

[0206] □ SRS request (0 or 2 bits): aperiodic SRS transmission indicator.

[0207] □TPC command (2 bits).

[0208] For another example, certain DCI formats can be used to deliver the same control information to more than one terminal. For example, the CRC of DCI format 2_0 can be scrambled with the SFI-RNTI and can be used to notify information such as the slot format, channel occupancy time (COT) duration, available RB sets, and search space set group switching. Specifically, DCI format 2_0 may include at least one of the following information.

[0209] - If the high-level parameter slotFormatCombToAddModList is configured,

[0210] □Time slot format indicator 1, time slot format indicator 2, ..., time slot format indicator N.

[0211] - If the higher layer parameter availableRB-SetsToAddModList-r16 is configured,

[0212] □ Available RB set indicator 1, available RB set indicator 2, ..., available RB set indicator N1.

[0213] - If the higher layer parameter co-DurationsPerCellToAddModList-r16 is configured,

[0214] □COT duration indicator 1, COT duration indicator 2, ..., COT duration indicator N2.

[0215] - If the high-level parameter searchSpaceSwitchTriggerToAddModList-r16 is configured,

[0216] □Search space set group switching flag 1, search space set group switching flag 2, ..., search space set group switching flag M.

[0217] The size of DCI format 2_0 can be set by higher layers to one of the values ​​of up to 128 bits. For example, DCI format 2_5 can be used to notify the availability of soft type resources of the IAB node. The CRC of DCI format 2_5 can be scrambled using the availability indicator (AI)-RNTI and can contain the following information.

[0218] □Availability indicator 1, availability indicator, ..., availability indicator N.

[0219] The size of DCI format 2_5 can be set by higher layers to one of the values ​​less than or equal to 128 bits.

[0220] The terminal may receive configuration information of CORESET#0 and search space#0, which may be the same or similar to that shown in Table 9.

[0221] [Table 9]

[0222]

[0223] The terminal may refer to the following high-level configurations for cell-specific PDCCH monitoring, which are the same or similar to those shown in Tables 10 to 13.

[0224] [Table 10]

[0225]

[0226]

[0227] [Table 11]

[0228]

[0229] [Table 12]

[0230]

[0231]

[0232] [Table 13]

[0233]

[0234]

[0235] The terminal may refer to the following high-level configuration for UE-specific PDCCH monitoring, which is the same or similar to that shown in Table 14.

[0236] [Table 14]

[0237]

[0238] The presence of one antenna port may mean a situation in which a channel experienced by a symbol transmitted via the corresponding antenna port can be estimated or inferred from a channel experienced by another symbol transmitted via the same antenna port.

[0239] "Two different antenna ports are quasi-co-located (QCLed)" may refer to a situation where large-scale characteristics of a channel experienced by symbols transmitted through one antenna port can be estimated or inferred from the channel experienced by symbols transmitted through the other antenna port. The large-scale characteristics of the channel may refer to at least one of "delay spread," "Doppler spread," "Doppler shift," "average gain," "average delay," and "spatial Rx parameters."

[0240] When the time / frequency resources of a certain signal (e.g., a QCL target RS) are insufficient and the large-scale characteristics of the channel cannot be accurately measured using only the corresponding signal, information (i.e., QCL information) about another signal (e.g., a QCL reference RS with sufficient time / frequency resources) that has large-scale characteristics and can be multiplexed to receive the corresponding signal (i.e., the QCL target RS) can be provided to the terminal to improve the terminal's channel measurement performance. NR communication systems can support the following various QCL types.

[0241] -QCL-Type A: includes {Doppler shift, Doppler spread, average delay, delay spread}.

[0242] -QCL-Type B: includes {Doppler shift, Doppler spread}.

[0243] -QCL-Type C: includes {Doppler shift, average delay}.

[0244] -QCL-Type D: includes {spatial Rx parameters}.

[0245] Figure 9 is a conceptual diagram illustrating an exemplary embodiment of a QCL information transmission process configured and indicated by a TCI state in a communication system.

[0246] refer to Figure 9 In the process of sending QCL information through TCI state configuration and indication in the communication system 900, the base station can configure up to M TCI states to the terminal through high-layer (i.e., RRC) signaling (S930) based on the UE capability report and the maximum value defined in the technical specification (e.g., 4, 8, 64, or 128, depending on the frequency band). In this case, each TCI state configuration 910 can include information about the signal or channel (i.e., QCL reference 915), which provides large-scale channel characteristics for the signal or channel (i.e., QCL target 920) that references the TCI. A TCI state configuration 910 can include up to two references (i.e., qcl-Type 1 and qcl-Type 2), the first reference can be one of the following: QCL-Type A, QCL-Type B, and QCL-type C (i.e., qcl-type 1∈{QCL-type A, QCL-type B, QCL-type C}), and the second reference can be QCL-type D (if present) (i.e., qcl-type2=QCL-type D).

[0247] Allowing the base station to apply in real time all the TCIs configured by RRC signaling will greatly increase the implementation complexity of the terminal. The base station can send an activation message (S940) for certain TCIs configured by RRC signaling to the terminal via L2 signaling (such as MAC CE). The base station can activate up to N (<M) TCIs, and the terminal can receive dynamic indications only for the activated TCIs.

[0248] Thereafter, the base station can dynamically indicate some of the N activated TCIs to the terminal via L1 signaling (such as DCI) (S950). After receiving the L1 signaling, the terminal can apply the QCL information indicated by the corresponding TCI at a predetermined timing and can perform the receiving operation for the signal or channel.

[0249] According to the type of the QCL target RS, some steps can be omitted Figure 9 The TCI status indication steps including "RRC signaling (S930)", "MAC CE signaling (S940)", and "DCI signaling (S950)". For example, when the QCL target is PDSCH DMRS and one or more TCI states are configured by RRC signaling, the base station can use Figure 9 all the steps in to indicate the TCI status. However, when the QCL target is PDSCH DMRS and a single TCI state is configured by RRC signaling, the MAC CE signaling (S940) and DCI signaling (S950) can be omitted. Similarly, when the QCL target is PDCCH DMRS, the DCI signaling step S940 can be omitted. Specifically, the terminal can refer to the RRC signaling similar to or the same as that shown in Table 15 to obtain the configuration information of the TCI status and QCL information.

[0250] [Table 15]

[0251]

[0252]

[0253] The base station can instruct the terminal to activate or deactivate some of the TCI states configured by RRC signaling via MAC CE signaling, or can instruct the terminal to apply the TCI state indicated by the MAC CE to the QCL target RS. For example, the base station can use the following MAC CE signaling according to the type of the QCL target RS.

[0254] - TCI status activation / deactivation MAC CE for UE-specific PDSCH DMRS.

[0255] - TCI status indication MAC CE for UE-specific PDCCH DMRS.

[0256] -TCI state activation / deactivation MAC CE for enhanced UE-specific PDSCH DMRS.

[0257] Figure 10 is a conceptual diagram illustrating an exemplary embodiment of a TCI state activation / deactivation MAC CE in a communication system.

[0258] refer to Figure 10 The first octet (Oct 1) in the TCI state activation / deactivation MAC CE for the UE-specific PDSCH DMRS may include a COREST pool ID field 1010, a serving cell ID field 1020, and a BWP ID field 1030. The second octet (Oct 2) to the Nth octet (Oct N) may include a Ti field 1040 indicating TCI state ID i. The specific meaning of each field may be as follows, and its size may vary.

[0259] - Serving cell ID: Serving cell ID to which MAC CE is applied.

[0260] -BWPID: BWP ID to which the MAC CE is applied, indicating the BWP associated with the BWP indication field in the DCI.

[0261] -Ti: Indicates that the TCI state ID is i. When this value is set to 0, it may indicate that the TCI state with TCI state ID i is deactivated; when this value is set to 1, it may indicate that the TCI state with TCI state ID i is activated. The TCI states activated by 1 can be sequentially mapped to the TCI indication field code points in the DCI.

[0262] -CORESET Pool ID: If DCI scheduling PDSCH is monitored in a CORESET that does not contain the higher-layer parameter coresetPoolIndex, this field can be ignored. If DCI scheduling PDSCH is monitored in a CORESET that contains the higher-layer parameter coresetPoolIndex, the Ti indication can only be applied if the value of the CORESET Pool ID matches the value of coresetPoolIndex of this CORESET.

[0263] Figure 11 is a conceptual diagram illustrating an exemplary embodiment of a TCI status indication MAC CE in a communication system.

[0264] refer to Figure 11The first octet (Oct 1) in the TCI state activation / deactivation MAC CE for the UE-specific PDSCH DMRS may include a serving cell ID field 1110 and a CORESET ID field 1120, and the second octet (Oct 2) may include a CORESET ID field 1130 and a TCI state ID field 1140. Its size may be variable.

[0265] - Serving cell ID: the serving cell ID to which the corresponding MAC CE is applied.

[0266] -CORESET ID: Indicates the CORESET to which the MAC CE is applied. If this value is set to 0, the CORESET configured by controlResourceSetZero can be CORESET#0.

[0267] -TCI State ID: indicates the TCI state ID indicated by the corresponding MAC CE.

[0268] The base station can configure spatial relationship information to the terminal through high-layer (e.g., RRC) signaling to indicate uplink beam information. The spatial relationship information can represent a signaling structure that is used to specify a spatial domain filter when sending and receiving a reference RS, and determine the spatial TX filter of the target RS in uplink transmission based on the corresponding spatial relationship. The spatial reference RS can be a downlink signal, such as SSB or CSI-RS, and can also be an uplink signal, such as SRS. If the reference RS is a downlink signal, the terminal can use the spatial RX filter value for receiving the reference RS as the spatial TX filter value for sending the target RS according to the spatial relationship. If the reference RS is an uplink signal, the terminal can use the spatial TX filter value for sending the reference RS as the spatial TX filter value for sending the target RS according to the spatial relationship.

[0269] The signaling structure for spatial relationship information may vary depending on the type of target RS. For example, when the target RS is an SRS, the base station may perform RRC configuration for each SRS resource based on the same or similar message as shown in Table 16.

[0270] [Table 16]

[0271]

[0272] For example, when the target RS is SRS, the base station may perform RRC configuration for each SRS resource, which may be the same as or similar to that shown in Table 17.

[0273] [Table 17]

[0274]

[0275] In a 5G NR communication system, a slot format may include downlink symbols, uplink symbols, and / or flexible symbols.

[0276] Figure 12 is a conceptual diagram illustrating a slot configuration according to a slot format in a communication system.

[0277] refer to Figure 12 In a slot configuration according to a slot format in a communication system, a downlink-dedicated slot 1200 may be a slot in which all symbols within the slot are configured only as downlink symbols 1215 according to the slot format. For another example, an uplink-dedicated slot 1205 may be a slot in which all symbols within the slot are configured only as uplink symbols 1220 according to the slot format. For another example, in a downlink / uplink mixed slot 1210, some symbols within the slot may be configured as downlink symbols 1225, while some symbols within the slot may be configured as uplink symbols 1235, according to the slot format. In this case, specific symbols within the mixed slot 1210, including both uplink and downlink symbols, may be configured or indicated as a guard period 1230 for uplink-downlink switching, and the terminal does not perform transmission / reception during the guard period 1230.

[0278] In a 5G NR communication system, a base station can configure the "time slot format" of one or more time slots of each serving cell to a terminal through the higher-layer parameter tdd-UL-DL-ConfigurationCommon. In this case, the higher-layer parameter tdd-UL-DL-ConfigurationCommon may include or reference at least one of the following information:

[0279] -Reference subcarrier spacing: Reference value configuration μ ref .

[0280] -Mode 1: First mode.

[0281] -Mode 2: Second mode.

[0282] Here, Mode 1 or Mode 2 may include at least one of the following configurations.

[0283] -Time slot configuration period (ie, dl-UL-TransmissionPeriodicity): the time slot configuration period P, expressed in milliseconds.

[0284] - Number of downlink dedicated time slots (i.e., nrofDownlinkSlots): The number of time slots consisting only of downlink symbols d slots .

[0285] -Number of downlink symbols (ie nrofDownlinkSymbols): number of downlink symbols d sym .

[0286] - Number of uplink dedicated time slots (i.e., nrofUplinkSlots): The number of time slots consisting only of uplink symbols u slots .

[0287] -Number of uplink symbols (i.e., nrofUplinkSymbols): Number of uplink symbols u sym .

[0288] The first mode of time slot configuration period P milliseconds may include time slots, and in this case, the numerical configuration can follow μ ref In addition, in S time slots, the first d slots The time slots may contain only downlink symbols, and then u slots The first d time slots may contain only uplink symbols. slots d after time slots sym symbols can be downlink symbols. slots u time slots ago sym The remaining symbols in the pattern that are not designated as downlink symbols or uplink symbols (i.e. symbols) can be flexible symbols.

[0289] If the second mode is configured and the time slot configuration period of the second mode is P2, the time slot configuration period P+P2 configured using the combination of the first mode and the second mode may include the first time slots and the second S2 = P2· In this case, the positions and numbers of downlink symbols, uplink symbols, and flexible symbols in the second mode can be configured based on the configuration information of the second mode, with reference to the description of the first mode. In addition, when configuring the second mode, the terminal can assume that P+P2 is a divisor of 20 milliseconds.

[0290] The base station may override the direction of the 'flexible symbol' among the symbols configured by the higher layer parameter tdd-UL-DL-ConfigurationCommon by using the higher layer parameter tdd-UL-DL-ConfigurationDedicated based on the following information.

[0291] -Slot configuration set (ie slotSpecificConfigurationsToAddModList): a collection of slot configurations.

[0292] -Slot index (ie slotIndex): the index of the slot contained in the slot configuration set.

[0293] -Symbol direction (i.e., symbols): the direction of the symbol indicated by the slot index (i.e., slotIndex). If all symbol directions are downlink (symbols=allDownlink), all symbols in the corresponding time slot are downlink symbols. If all symbol directions are uplink (symbols=allUplink), all symbols in the corresponding time slot are uplink symbols. If the symbol direction is explicit (symbols=explicit), nrofDownlinkSymbols can indicate the number of downlink symbols located in the first half of the corresponding time slot, and nrofUplinkSymbols can indicate the number of uplink symbols located in the second half of the corresponding time slot. If nrofDownlinkSymbols or nrofUplinkSymbols is omitted, the corresponding parameter can be regarded as indicating a value of 0. The remaining symbols in the time slot become flexible symbols.

[0294] In a 5G communication system, the base station can indicate the time slot format to the terminal based on L1 signaling. For example, when the terminal receives the high-layer parameter SlotFormatIndicator from the base station, the terminal can obtain the configuration information of the time slot format indication-RNTI (ie, SFI-RNTI). In addition, when the terminal receives the high-layer parameter dci-PayloadSize from the base station, the terminal can obtain the configuration information of the payload size of DCI format 2_0. In addition, the terminal can also additionally receive information about the PDCCH candidates, CCE aggregation level and search space set of the CORESET for monitoring DCI format 2_0 from the base station. Each time slot format indication (SFI) index field in DCI format 2_0 can indicate the time slot format of each time slot in the time slot set applied to DL BWP and UL BWP, starting from the time slot in which the terminal detects the corresponding DCI format 2_0. In this case, the size of the time slot set can be equal to or greater than the PDCCH monitoring period of DCI format 2_0. For example, when the slot set consists of N slots, DCI format 2_0 may include N SFI index fields, each of which may indicate a format value in the following Tables 18 to 20. In Tables 18 to 20, "D" may represent a downlink symbol, "U" may represent an uplink symbol, and "F" may represent a flexible symbol.

[0295] [Table 18]

[0296]

[0297]

[0298] [Table 19]

[0299]

[0300] [Table 20]

[0301]

[0302]

[0303] Figure 13 is a sequence diagram illustrating an exemplary embodiment of a UE capability reporting procedure in a communication system.

[0304] refer to Figure 13 In the UE capability reporting procedure, when the terminal is in RRC connection mode (i.e., RRC_CONNECTED state), the base station may send a UE capability report request signal to the terminal through a higher layer parameter UECapabilityEnquiry (S1300). In this case, the network may only refer to the UE capability report after the access stratum (AS) is securely activated, and may not retransmit or report the UE capability report before the AS security activation to the core network (CN). After receiving the UE capability report request signal, the terminal may compile the UE capability information according to a specific procedure and report it to the base station through a UE capability information signal (e.g., UECapabilityInformation) (S1310).

[0305] The specific procedure for compiling the UE capability information signal may include a procedure for generating at least one of a list of frequency bands or frequency band combinations (BCs) supported by the terminal (i.e., supportedBandCombinationList), feature set (FS) information related to feature sets supported by the terminal, or feature set combination (FSC) information related to feature set combinations supported by the terminal. For example, when a base station requests a UE capability report from a terminal to obtain information about frequency bands or frequency band combinations supported by the terminal, the terminal may report the frequency bands it supports for each radio access technology (RAT). To this end, the base station may set the RAT type in a UE RAT capability report request signal (e.g., UE-CapabilityRAT-Request) included in a UE RAT capability report request list signal (e.g., ue-CapabilityRAT-RequestList) as a higher layer message to one of "nr," "eutra-nr," "eutra," or "eutra-fdd." This may mean that the base station may request a UE capability report for one or more RATs or RAT combinations from the terminal, and in this case, the terminal may respond to each request for a list of supported frequency bands for multiple RATs or RAT combinations. For example, if the RAT type is set to "nr", the terminal may include a list of frequency bands or frequency band combinations to which NR-DC can be applied in the UE capability report. For another example, if the RAT type is set to "eutra-nr", the terminal may include a list of frequency bands or frequency band combinations applicable to multi-RATDC (MR-DC), such as EN-DC, NGEN-DC, NE-DC, etc., in the UE capability report. In addition, when the base station requests a UE capability report, the base station may provide the terminal with a list of frequency bands that the terminal determines whether to support through the high-level parameter freqBandListFilter. For the frequency bands included in the high-level parameter freqBandListFilter, the terminal may determine a candidate frequency band combination by considering "predetermined RAT types supported by each frequency band", "information about the RAT type requested by the base station", etc., and may include the candidate frequency band combination in the UE capability report.

[0306] Figure 14a and Figure 14b is a conceptual diagram for describing a first exemplary embodiment of a user plane protocol stack structure and a control plane protocol stack structure in a communication system.

[0307] refer to Figure 14a and Figure 14b, a radio interface protocol stack or a radio interface protocol stack structure 1400 and 1450 can be defined in the radio connection part between communication nodes. For example, the radio interface protocol stack can be divided into a physical layer, a data link layer, a network layer, etc., and these layers are vertically configured.

[0308] The radio interface protocol stack can be divided into a user plane protocol stack 1400 and a control plane protocol stack 1450. Here, the control plane can be a plane for transmitting control signals. The control signals can be called signaling signals. The user plane can be a plane for transmitting user data.

[0309] refer to Figure 14a , a communication system may include a terminal 1410 and a base station 1420. Terminal 1410 may be referred to as user equipment (UE). Base station 1420 may correspond to an eNB, gNB, etc. Terminal 1410 and base station 1420 may transmit / receive data signals to / from each other based on the user plane protocol stack structure 1400 shown in FIG14A .

[0310] In the user plane air interface protocol stack structure 1400 of the communication system, the terminal 1410 and the base station 1420 may include PHY layers 1411 and 1421, MAC layers 1412 and 1422, RLC layers 1413 and 1423 included in L1, packet data convergence protocol (PDCP) layers 1414 and 1424 included in L2, service data adaptation protocol (SDAP) layers 1415 and 1425 included in L3, and the like.

[0311] refer to Figure 14b , the communication system may include a terminal 1460 and a base station 1470. The terminal 1460 and the base station 1470 may be based on Figure 14b The control plane protocol stack structure 1450 shown performs mutual control signal transmission / reception.

[0312] In the control plane protocol stack structure 1450 of the communication system, the terminal 1460 and the base station 1470 may include PHY layers 1461 and 1471, MAC layers 1462 and 1472, RLC layers 1463 and 1473 included in L1, PDCP layers 1464 and 1474 included in L2, RRC layers 1465 and 1475 included in L3, and the like.

[0313] The communication system may also include an access and management mobility function (AMF) 1480. In the control plane protocol stack structure 1450, the terminal 1460 and the AMF 1480 may include non-access stratum (NAS) layers 1466 and 1486. ​​The base station 1470 may not include the NAS layer. In other words, in the control plane protocol stack structure 1450, the NAS layer of the base station 1470 may be transparent.

[0314] The following will describe Figure 14a and Figure 14b The main features of each layer.

[0315] In the SDAP layers 1415 and 1425, one SDAP entity may be configured for each protocol data unit (PDU) session, and two entities may be configured in the case of dual connectivity (DC). In addition, the SDAP layers 1415 and 1425 may provide quality of service (QoS) flows to the 5G core network (5GC) through the following elements:

[0316] - Improved QoS flow for data radio bearers.

[0317] -DL activates QoS Flow Identifier (QFI) for UL implementation.

[0318] The PDCP layers 1414 and 1424 of the user plane may provide radio bearers to the SDAP layers 1415 and 1425 through elements described below.

[0319] -Sequence number.

[0320] - Header compression and decompression.

[0321] -Transmission of user data.

[0322] - Reordering and duplicate detection.

[0323] -PDCP PDU routing.

[0324] -Retransmission of PDCP SDU.

[0325] -Encryption and decryption.

[0326] -PDCP SDU discarded.

[0327] -PDCP re-establishment and data recovery for RLC AM.

[0328] -Repetition of PDCP PDUs.

[0329] The PDCP layers 1464 and 1474 of the control plane may provide a radio bearer to the RRC layer through elements described below.

[0330] -Sequence number.

[0331] -Encryption, decryption and integrity protection.

[0332] -Transmission of control plane data.

[0333] -Duplicate detection.

[0334] -Repetition of PDCP PDUs.

[0335] The RRC layers 1765 and 1775 may perform the following operations.

[0336] - Broadcast of system information related to AS and NAS.

[0337] -Paging initiated by 5GC or NG-RAN.

[0338] - Establish, maintain, and release the RRC connection between the user equipment (UR) and the next generation radio access network (NG-RAN), including the addition, modification, and release of carrier aggregation (CA) between NR or E-UTRA, and the addition, modification, and release of dual connectivity (DC) between NR or E-UTRA.

[0339] - Security features including key management.

[0340] - Establishment, configuration, maintenance and release of Signalling Radio Bearers (SRBs) and Data Radio Bearers (DRBs).

[0341] - Mobility functions, including handover and context transfer; UE cell selection and reselection and control of cell selection and reselection; inter-RAT mobility.

[0342] -QoS management function.

[0343] -UE measurement reporting and reporting control.

[0344] - Detection and recovery of radio link failures.

[0345] -NAS message transmission from NAS to UE / from UE to NAS.

[0346] The MAC layers 1412, 1422, 1462, and 1472 may provide logical channels to the RLC layer through the following elements.

[0347] - Mapping between logical channels and transport channels.

[0348] -Multiplexing MAC SDUs belonging to one or different logical channels into a transport block (TB) delivered to the physical layer on a transport channel / demultiplexing MAC SDUs belonging to one or different logical channels from a transport block (TB) delivered from the physical layer on a transport channel.

[0349] -Dispatch information report.

[0350] - Error correction through HARQ.

[0351] - Prioritize UEs through dynamic scheduling.

[0352] - Priority handling between logical channels of a UE through logical channel priorities.

[0353] -filling.

[0354] The PHY layers 1411 , 1421 , 1461 , and 1471 may provide transport channels to the MAC layers 1412 , 1422 , 1462 , and 1472 , and a detailed method thereof is replaced by the general description of the physical layer in the present disclosure.

[0355] 5G communication systems can provide technologies for improving wireless coverage and / or reducing network configuration costs. For example, 5G communication systems can provide integrated access and backhaul (IAB) technology, which provides wireless backhaul / fronthaul that can coexist with the radio access network and repeater technology that covers shadow areas at low cost.

[0356] In the 5G NR communication system, the IAB feature can be used to support flexible and dense wireless backhaul links for each cell without the need for wired network support. Figure 14a and Figure 14b The protocol structure can be appropriately changed and applied according to the situation when carrier aggregation (CA) or dual connectivity (DC) is applied.

[0357] Figure 15 is a conceptual diagram showing an example of a network configuration implemented by the IAB function.

[0358] refer to Figure 15 , showing IAB nodes 1511, 1512, 1521, 1531, and 1532, and terminal 1540. Each of IAB nodes 1511, 1512, 1521, 1531, and 1532 can be considered a transponder / repeater configured based on the fronthaul architecture. Each IAB node 1511, 1512, 1521, 1531, and 1532 can be configured with two elements: an IAB-distributed unit (DU) and an IAB-mobile terminal (MT). Depending on its deployment in the network, each of IAB nodes 1511, 1512, 1521, 1531, and 1532 can act as a parent node or a child node.

[0359] exist Figure 15In the embodiment, from the perspective of the network layer, the IAB node 1521 may belong to the IAB node layer 1520, the IAB nodes 1531 and 1532 may belong to the parent node layer 1530 of the IAB node layer 1520, and the IAB nodes 1511 and 1512 may belong to the child node layer 1510 of the IAB node layer 1520. The IAB-MT of the IAB node 1521 may communicate with the IAB-DUs of the IAB nodes 1531 and 1532 of the parent node layer 1530, and the IAB-DU of the IAB node 1521 may communicate with the IAB-MTs of the IAB nodes 1511 and 1512 of the child node layer 1510 and the terminal 1540. Therefore, the IAB nodes 1531 and 1532 of the child node layer 1510 and the terminal 1540 may recognize the IAB node 1521 as their cell (serving cell). This means that the IAB-DU of IAB node 1521, the IAB-MT of the lower node, and terminal 1540 are connected via NR Uu interfaces 1543 to 1545, which are air interfaces between the base station and the terminal. Similarly, the IAB-MT of IAB node 1521 can communicate with the parent node, and each of parent nodes 1531 and 1532 can recognize IAB node 1521 as a terminal. Therefore, this means that parent nodes 1531 and 1532 are connected to IAB node 1521 via NR Uu interfaces 1541 and 1542 (which are air interfaces).

[0360] IAB node 1521 can be classified as a regenerative relay type, which receives signals from at least one parent IAB node, fully decodes, re-encodes, and amplifies / transmits them. To this end, IAB node 1521 can have a protocol stack structure including L1 and L2 layers (in some cases, also including L3 or higher layers), and can support the control plane (CP) and user plane (UP) from upper-layer nodes (e.g., donor IAB node, parent IAB node) to terminal 1540. The advantage of this structure is that it enables IAB nodes to perform various operations similar to existing base stations and terminals. However, this structure also increases the implementation complexity and cost of IAB nodes and introduces various disadvantages, such as the delay required for retransmission.

[0361] In contrast to IAB, an RF repeater (eg, RF transponder, etc.) is a non-regenerative repeater that simply amplifies and retransmits all received signals.

[0362] Figure 16 is a conceptual diagram illustrating deployment of commercial radio frequency repeaters.

[0363] refer to Figure 16, shows the deployment of a base station 1610 and a commercial RF repeater for receiving wireless signals from the base station 1610. The base station 1610 is illustrated as a base station capable of forming a single beam 1641 for each sector through an antenna 1611. In this case, the base station 1610 may be a base station such as an eNB and / or a gNB.

[0364] Generally speaking, the main purpose of a commercial RF repeater is to cover indoor shadow areas. Therefore, the commercial RF repeater can receive signals from the base station 1610 through an outdoor external antenna 1621. The external antenna 1621 can be a directional antenna that can form a receiving beam 1651 in a specific direction. In addition, the commercial RF repeater can be composed of a repeater unit 1622 (the repeater unit amplifies and retransmits the signal received from the base station) and an indoor patch antenna 1623 (the indoor patch antenna transmits the amplified signal indoors). Figure 16 As shown, the external antenna 1621, the repeater unit 1622 and the internal patch antenna 1623 can be connected by wires. Figure 16 The external antenna 1621, the repeater unit 1622, and the internal patch antenna 1623 are shown as being connected by wires, but they may also be connected wirelessly. Therefore, the internal patch antenna 1623 can communicate wirelessly with the terminal 1630. In this case, the terminal 1630 may be as follows: Figure 16 The terminal is shown with a full beam, or it may be a terminal with a directional beam.

[0365] Commercial RF repeaters can generally operate in the FR1 frequency band, and in the corresponding frequency band, the base station 1610 (e.g., eNB (which is an LTE base station) and gNB (which is an NR base station)) can operate with one beam per cell or sector. In the case of a downlink (a link through which signals are sent from a base station to a terminal), the external antenna 1621 can be a receiving antenna for receiving signals from the base station, while the internal patch antenna 1623 can be a transmitting antenna for sending signals to the terminal 1630. On the other hand, in the case of an uplink (a link through which signals are sent from a terminal to a base station), the external antenna 1621 can be a transmitting antenna, while the internal patch antenna 1623 can be a receiving antenna.

[0366] The external antenna 1621, typically configured as a directional log-periodic dipole array, can be manually mounted to face the direction of the base station. The internal patch antenna 1623, which transmits the amplified / retransmitted signal, can be configured as a patch antenna with an effective coverage range of approximately 70 to 75 degrees, thereby enabling the terminal 1620 to operate indoors with a full beam (non-directional beam).

[0367] exist Figure 16In the illustrated case, the base station 1610 can identify the "base station beam," the "beam of the external antenna for the repeater," and the "beam of the internal patch antenna for the repeater" as one transmit beam (i.e., a single virtual Tx beam). Similarly, the base station 1610 can identify the "beam of the external antenna 1621 for the repeater," the "beam of the internal patch antenna 1623 for the repeater," and the "terminal beam" as one receive beam (i.e., a single virtual Rx beam).

[0368] Figure 17 is a conceptual diagram illustrating protocol stacks of a control plane and a user plane of a wireless communication system including an RF repeater.

[0369] The protocol stack of the RF repeater can have the same structure for both the control plane and the user plane. Figure 17 The structure shown.

[0370] refer to Figure 17 In each of the control plane and the user plane for the RF repeater, the base station may include an RF layer 1711, a PHY layer 1712, a MAC layer 1713, an RLC layer 1714, a PDCP layer 1715, and an RRC layer 1716, and the terminal may also include an RF layer 1731, a PHY layer 1732, a MAC layer 1733, an RLC layer 1734, a PDCP layer 1735, and an RRC layer 1736. Figure 17 The protocol stack shown in Figure 14a and Figure 14b The protocol stack is the same as that described in . Therefore, redundant description will be omitted. However, Figure 17 and Figure 14a and Figure 14b The difference is that both the base station and the terminal further include RF layers 1711 and 1731. The RF layers 1711 and 1731 may be a general configuration for transmitting and receiving RF signals in a wireless communication system such as a 3GPP system.

[0371] In addition, Figure 17 In the present invention, the protocol stack including the repeater from the PHY layer to the RRC layer is transparent, and from the perspective of the RF1721 layer, the wireless signal received by the repeater can be amplified and forwarded.

[0372] In the above Figure 16 and Figure 17 In the environment shown in Figure 1, the repeater simply repeats simple RF amplification and forwarding functions, reducing the implementation complexity and cost of the repeater. However, in this case, because the base station and network cannot explicitly or implicitly manage the repeater, there may be a disadvantage of not being able to explicitly manage the repeater's beam, enhance signal quality, or adjust interference.

[0373] Figure 16 and Figure 17 The performance of RF repeaters in a wireless network may be limited to time division duplex (TDD) bands (typically 3.5 GHz band or FR2 band) that require complex DL / UL switching or FR2 bands that require multi-beam operation.

[0374] In 5G NR systems, the base station can dynamically indicate the DL / UL direction for each time slot and / or symbol to the terminal or IAB node via L1 signaling, based on the time slot format configuration and / or indication. Furthermore, the base station can dynamically send beam / TCI / QCL instructions for each channel to the terminal or IAB node. On the other hand, the base station cannot send such instructions to the RF repeater. Since the RF repeater cannot decode the signals sent from the base station, even if the base station sends such an instruction, the RF repeater will not be able to recognize it.

[0375] In order to solve the above problems, an advanced repeater capable of decoding part or all of the signals transmitted from the base station may be considered.

[0376] Figure 18 is a conceptual diagram illustrating a protocol stack of a control plane of an advanced relay according to an exemplary embodiment of the present disclosure.

[0377] In reference Figure 18 Previously, advanced repeaters may be referred to as smart repeaters, advanced repeaters, enhanced repeaters, low-cost IAB nodes, and network-controlled repeaters (i.e., NWC repeaters or NCRs). In addition, advanced repeaters may refer to repeaters with various names that can perform the operations described in this disclosure.

[0378] refer to Figure 18 , only the control plane protocol stack of the advanced relay is shown. The user plane protocol stack of the advanced relay can adopt the same protocol stack as previously described. Figure 17 In other words, Figure 17 As shown, for the user plane of the advanced relay, the base station may include an RF layer 1711, a PHY layer 1712, a MAC layer 1713, an RLC layer 1714, a PDCP layer 1715, and an RRC layer 1716, and the terminal may also include an RF layer 1731, a PHY layer 1732, a MAC layer 1733, an RLC layer 1734, a PDCP layer 1735, and an RRC layer 1736. In addition, the user plane of the advanced relay may only have an RF layer 1721, as shown in FIG. Figure 17 Therefore, the protocol stack from the PHY layer to the RRC layer can be transparent in the protocol stack of the user plane of the advanced repeater, and from the perspective of the RF layer 1721, the received wireless signal can be amplified and forwarded.

[0379] The following will refer to Figure 18 To describe the control plane of the advanced relay. Figure 18 As shown in FIG. 1 , for the control plane of the advanced relay, the base station may include an RF layer 1811, a PHY layer 1812, a MAC layer 1813, an RLC layer 1814, a PDCP layer 1815, and an RRC layer 1816. The terminal may also include an RF layer 1831, a PHY layer 1832, a MAC layer 1833, an RLC layer 1834, a PDCP layer 1835, and an RRC layer 1836. Therefore, the base station and the terminal may adopt Figure 17 The user plane and Figure 18 The control plane shown performs signaling.

[0380] In addition, it can be seen that Figure 17 Different from the form shown, the control plane of the advanced repeater further has an RF layer 1821 and a PHY layer 1822. Therefore, the PHY layer 1822 of the advanced repeater can obtain management information of the repeater, such as beam and / or DL / UL configuration and time slot format, from the base station so that it can be controlled based on the management information.

[0381] The PHY layer 1822 may allow the base station to control various beams, beam combinations, or time slot formats within the link between the base station and the relay and the link between the relay and the terminal by using beam or time slot format management / indication information or a capability report of the relay (or the UE capability of the relay as a UE) to resolve the reference Figure 15 and Figure 16 Describe the problem.

[0382] Figure 18 The control plane protocol stack and user plane protocol stack of the advanced repeater shown are for a number of different repeater implementations and are not necessarily limited to Figure 18 In other words, it is worth noting that the required protocol stack can be extended according to the implementation of the repeater. For example, if the implementation of the repeater or the operation of the repeater relies on the signaling of some higher L2 / L3 layers, then in addition to Figure 18 In addition to the PHY layer 1822 in the repeater, the repeater may also include part or all of some higher L2 / L3 layers (such as the MAC layer). In order not to obscure the main purpose of the description, the present disclosure does not list all possible forms.

[0383] Figure 19 This is a conceptual diagram used to describe cell-specific configuration, terminal-specific configuration, and indication information within a specific given time according to TDD configuration.

[0384] refer to Figure 19, the cell-specific DL / UL configuration 1901 can configure the cell-specific downlink (D) time slot / symbol 1911, the cell-specific flexible (F) time slot / symbol 1912, and the cell-specific uplink (U) time slot / symbol 1913 as a time slot / symbol format within a given time period. In this case, the cell-specific DL / UL configuration 1901 can be configured using, for example, the higher-layer parameter tdd-UL-DL-ConfigurationCommon.

[0385] exist Figure 19 In the figure, D stands for 'downlink', F stands for 'flexible', and U stands for 'uplink'.

[0386] In addition, the cell-specific F slot / symbol 1912 may be determined in more detail by the terminal-specific (UE-specific) DL / UL configuration 1902. The UE-specific DL / UL configuration may be configured, for example, by the higher-layer parameter tdd-UL-DL-ConfigurationDedicated. Figure 19 , shows a case where a cell-specific F slot / symbol 1912 can be configured to a dedicated D slot / symbol 1921, a dedicated F slot / symbol 1922, and a dedicated U slot / symbol.

[0387] In this case, the time slot 1922 configured as the F time slot by both the cell-specific F configuration 1912 and the terminal-specific F configuration 1922 can be indicated by the DCI as a dynamic D time slot / symbol 1931 or a dynamic U time slot / symbol 1932. In this case, the DCI can be indicated by a time slot format indication (SFI) value indicated by, for example, DCI format 2_0.

[0388] Figure 19 The order of “D / F / U” and “D / F / U” shown in is merely an example for understanding the present disclosure and may be appropriately changed in actual application to adapt to the channel environment or operator's preference.

[0389] Figure 20 is a conceptual diagram used to describe the deployment of network control repeaters.

[0390] refer to Figure 20 , the base station 2010 can transmit RF signals to a network controlled repeater (NCR) and receive RF signals from the network controlled repeater (NCR) via the antenna 2011. In addition, the base station 2010 can also transmit RF signals to a terminal and receive RF signals from the terminal via the antenna 2011. The antenna 2011 of the base station 2010 can correspond to one or more antennas or antenna groups.

[0391] The NCR may include a repeater unit 2020, a first repeater antenna 2026, and a second repeater antenna 2027. The first repeater antenna 2026 and / or the second repeater antenna 2027 of the NCR may correspond to one or more antennas or antenna groups. Thus, the NCR 2020 may establish a wireless connection between the base station 2010 and the NCR 2020 via the first repeater antenna 2026. Here, the wireless connection may include a control link and / or a backhaul link via RF signals. Furthermore, the NCR 2020 may establish a wireless connection with the terminal 2030 via the second repeater antenna 2027.

[0392] The repeater unit 2020 may be composed of a repeater-mobile terminal (MT) 2021 and a repeater-amplify and forward (AF) 2022. The repeater 2020 may have other components in addition to the repeater-MT 2021 and the repeater-AF 2022, but not all of these components are described in this disclosure. The repeater-MT 2021 and the repeater-AF 2022 may be connected via an internal control interface 2023.

[0393] Based on the above configuration, the link between the base station 2010 and the MCR can be configured as a control link and a backhaul link. The control link transmits signals for the base station 2010 to control the NCR, and the backhaul link transmits signals for the base station 2010 to provide services to the terminal 2030. The wireless link between the NCR and the terminal 2030 can be collectively referred to as an access link. The repeater unit of the NCR is responsible for signal processing and includes a repeater-MT 2021 (which receives and processes control signals from the base station 2010) and a repeater-AF 2022 (which amplifies signals received from the base station 2010 and retransmits the amplified signals). The above configuration of the NCR is an example of a possible NCR configuration, and the NCR may include additional components or functions when actually implemented, and the NCR may be referred to by one of the various names described above, or by a name other than the various names described above.

[0394] Repeater-MT 2021 and Repeater-AF 2022 can be connected to a wireless link with base station 2010 via NCR's first repeater antenna 2026. In this case, Repeater-MT 2021 can receive repeater control information 2040 via first repeater antenna 2026 and instruct Repeater-AF 2022 on a corresponding repeater control or operation procedure via internal control interface 2023. According to the instructed repeater control or operation procedure, Repeater-AF 2022 can amplify a signal from base station 2010 received via first repeater antenna 2026 and transmit the amplified signal to terminal 2030 via second repeater antenna 2027 (i.e., downlink relay). Alternatively, Repeater-AF 2022 can amplify a signal from terminal 2030 received via second repeater antenna 2027 and transmit the amplified signal to base station 2010 via first repeater antenna 2026 (i.e., uplink relay).

[0395] above Figures 16 to 18 The various repeater implementations / configurations can be categorized as follows based on the method or level at which the repeater receives, measures, or interprets base station signals.

[0396] ●Repeater Type 1: The first type of repeater can be defined as a repeater without a signal processing unit to decode or re-encode the signal of the base station. In this case, the repeater can determine the DL / UL direction or beam direction based on the characteristics of the wireless signal received from the base station or terminal. To this end, the repeater may need to monitor to determine the characteristics of the wireless signal received from the base station or terminal in a certain time / frequency resource. Here, the characteristics of the wireless signal received from the base station or terminal may include reception strength, reception time period, degree of change of reception strength (i.e., envelope detection), etc. In addition, the DL / UL direction may refer to the time slot format, and the beam direction may refer to TCI to QCL.

[0397] ●Repeater Type 2: The second type of repeater can be defined as a repeater having a signal processing unit capable of receiving cell-specific system information broadcast from a base station. For example, the broadcast cell-specific system information may refer to DL / UL mode information pre-configured when the repeater is installed, or DL / UL mode information configured through the application layer. For another example, the broadcast cell-specific system information may be time slot format information (i.e., D / F / U information) configured by the high-layer parameter tdd-UL-DL-ConfigurationCommon. In this case, the corresponding type of repeater can be assumed to use only the information corresponding to tdd-UL-DL-ConfigurationCommon in the above-mentioned configuration information for time slot format indication, and can be assumed to be unable to use the configuration information tdd-UL-DL-ConfigurationDedicated indicating the terminal-specific time slot format. In addition, in this case, the repeater may only be able to identify static or semi-static DL / UL directions, and may not be able to determine the DL / UL direction of resources configured as 'F' through tdd-UL-DL-ConfigurationCommon. Here, resources configured as “flexible” may refer to resources for which DU / UL direction may be specifically configured for its UE through tdd-UL-DL-ConfigurationDedicated, or may be dynamically indicated through L1 signaling (such as DCI format 2_0).

[0398] ●Relay Type 3: The third type of relay may be defined as a relay having a signal processing unit capable of receiving all control information transmitted by a base station. That is, the third type of relay may refer to a relay capable of identifying the above-mentioned slot format indication procedure and its application by using not only the cell-specific configuration information tdd-UL-DL-ConfigurationCommon but also the UE-specific configuration information tdd-UL-DL-ConfigurationDedicated and L1 signaling (e.g., DCI format 2_0 or other DCI formats including a slot format indicator (SFI)).

[0399] The repeater can have various internal structures, depending on the number and configuration of amplification units including one or more power amplifiers, RF amplifiers and / or amplifier groups.

[0400] Figure 21 A conceptual diagram used to describe the amplifier structure in NCR and the RF chain configuration based on it.

[0401] refer to Figure 21, shows the configuration of a repeater that amplifies signals transmitted / received between a base station 2110 and a terminal 2120. The repeater may include a first antenna 2130, a second antenna 2150, and an RF chain 2140. The first antenna 2130 and the second antenna 2150 may have the same configuration and may be a composite antenna. The first antenna 2130 may include an antenna array 2131 and a radio distribution network (RDN) 2132 for receiving or transmitting signals from or to the base station 2110, while the second antenna 2150 may include an antenna array 2151 and an RDN 2152 for receiving or transmitting signals from or to the terminal 2120. Each of the RDNs 2132 and 2152 included in the first antenna 2130 and the second antenna 2150 may distribute signals to be transmitted or received to the RF chain 2140.

[0402] The RF chain 2140 may include a first amplifier 2141 for amplifying a signal of a transmit (DL) path and a second amplifier 2142 for amplifying a signal of a receive (UL) path. In other words, the RF chain 2140 may include separate amplifiers 2141 and 2142 for the respective paths. The repeater may connect the repeater antenna group to the transmit path and / or receive path according to the uplink / downlink direction determined (indicated or detected) at a certain point in time.

[0403] Figure 22 is a conceptual diagram for describing an amplifier structure in NCR and another RF chain configuration based thereon.

[0404] refer to Figure 22 , shows a configuration of a repeater that amplifies signals transmitted / received between a base station 2210 and a terminal 2220. The repeater may include a first antenna 2230, a second antenna 2250, and an RF chain 2240. The first antenna 2230 and the second antenna 2250 may have the same configuration as previously described. Figure 21 Therefore, repeated descriptions about the configurations of the first antenna 2230 and the second antenna 2250 will be omitted.

[0405] Compare Figure 21 and Figure 22 , there are differences in RF chain 2240. It can be seen that Figure 22 The RF chain 2240 shown in FIG uses a common amplifier. In the case of the transmit (DL) path, the signal received by the first antenna 2230 can be amplified by the amplifier 2241 and output through the second antenna 2250, as shown in FIG. Figure 21On the other hand, in the case of a reception (UL) path, the signal received by the second antenna 2250 can be input to the same amplifier 2241 used in the transmission path, and the signal amplified by the amplifier 2241 can be transmitted through the first antenna 2230. Therefore, the repeater can control the repeater antenna group to be connected to the transmission path or the reception path according to the uplink / downlink direction determined (indicated or detected) at a specific time point.

[0406] Figure 23 is a conceptual diagram for describing an amplifier structure in NCR and another RF chain configuration based thereon.

[0407] refer to Figure 23 , shows a configuration of a repeater that amplifies signals transmitted / received between a base station 2310 and a terminal 2320. The repeater may include a first antenna 2330, a second antenna 2350, and an RF chain 2340. The first antenna 2330 and the second antenna 2350 may have the same configuration as previously described. Figure 21 Therefore, redundant descriptions about the configurations of the first antenna 2330 and the second antenna 2350 will be omitted.

[0408] Compare Figure 21 and Figure 23 , there are differences in RF chain 2240. It can be seen that Figure 23 The RF chain 2340 shown in FIG uses one amplifier. As can be seen, Figure 23 The repeater shown in Figure 1 has only one amplifier for the receive (UL) path and no transmit (DL) path. Considering that in many cases, the bottleneck in the wireless link is the limited uplink coverage caused by the limited transmit power of the terminal, this can be a structure that can reduce the implementation and installation costs of the repeater and suppress the downlink interference caused by the repeater.

[0409] The repeater types described above are only examples to help understanding and can be appropriately expanded or modified in actual applications.

[0410] For example, relay type 2 can be further subdivided into additional subtypes. For example, a particular relay might be restricted to receiving only the PBCH, and thus only the MIB. Alternatively, it might be able to receive some or all SIBs, or even additionally receive a portion of the RRC configuration. Various applications are possible in this context. Here, the term "portion of the RRC configuration" can refer to, for example, a cell-specific RRC configuration.

[0411] In addition, the repeater can be limited to Figures 21 to 23Instead of the configuration scheme depicted in FIG, various other configuration schemes may also be used. For example, it may be configured with multiple amplifier pairs in the downlink (DL) path and / or the uplink (UL) path, using one configuration scheme or a combination of multiple configuration schemes.

[0412] according to Figures 21 to 23 In similar configurations, the NCR may need to transmit two different uplink signals. For example, the different uplink signals may include the uplink signal of the relay-MT and / or a signal obtained by amplifying the uplink signal of the terminal received via antenna group #2. In this case, the transmit power of each uplink signal can be determined based on the 5G NR according to the following formula 5.

[0413] [Formula 5]

[0414]

[0415] In formula 5, i can represent the transmission occasion, l can represent the closed-loop power control adjustment state, P CMAX (i) can represent the maximum transmit power of the terminal, P0(i) can represent the nominal UE transmit power, 2 μ It can represent the subcarrier spacing, M RB may denote the number of RBs allocated for uplink transmission, α(i) may denote the fractional power control coefficient, PL may denote the measured path loss, Δ(i) may denote the offset according to the modulation and coding scheme, and f(i,l) may denote the closed-loop power control value.

[0416] In Formula 5, the types and definitions of the components may vary depending on the type of channel and / or signal transmitted during transmission, but detailed information is omitted to avoid obscuring the key points of the description. Here, the type of channel and / or signal may be, for example, PUSCH, PUCCH, SRS, PRACH, etc. For example, P CMAX (i) can be expressed as P CMAX,f,c , which is the maximum power of carrier f that can be used to serve cell c.

[0417] Formula 5 indicates that if the instantaneous transmit power determined at a certain transmission moment is higher than the maximum transmit power value, the transmit power at that transmission moment can be set to the maximum transmit power value. Here, the value of the instantaneous transmit power can be determined based on terminal implementation and / or individual base station configuration.

[0418] Different uplink signals sent by the repeater, such as 'Signal #1: uplink signal of the repeater-MT sent via the control link' and / or 'Signal #2: a signal obtained by amplifying the uplink signal of the terminal received at antenna group #2, which is sent via the backhaul link', can be sent according to the following multiplexing conditions.

[0419] ●Time Division Multiplexing (TDM) mode: A situation where signal #1 and signal #2 are sent using different time resources.

[0420] ● Frequency Division Multiplexing (FDM) mode: Signal #1 and Signal #2 are transmitted using the same or partially overlapping time resources but different frequency resources.

[0421] ● Spatial Division Multiplexing (SDM) mode: Signal #1 and Signal #2 use the same or partially overlapping time and frequency resources, but are transmitted using different spatial resources (such as beams and / or antenna domain resources).

[0422] Figure 24 is a conceptual diagram for describing an amplifier structure in NCR and another RF chain configuration based thereon.

[0423] refer to Figure 24 , shows a configuration of a repeater that amplifies signals transmitted / received between a base station 2410 and a terminal 2420. The repeater may include a first antenna 2430, a second antenna 2450, and an RF chain 2440. The first antenna 2430 and the second antenna 2450 may have the same configuration as previously described. Figure 21 Therefore, redundant descriptions regarding the configurations of the first antenna 2430 and the second antenna 2450 will be omitted.

[0424] Figure 24 The RF chain 2440 shown in the figure may include N amplifiers 2441, ..., and 2442 in the transmit (DL) path and M amplifiers 2443, ..., and 2444 in the receive (UL) path. Here, N and M are natural numbers, and N and M can be different values ​​or the same value. When there are multiple power amplifiers (PAs) 2441, 2442, 2443, and 2444 on the transmit path and the receive path, the repeater can support carrier aggregation (CA) and / or dual connectivity (DC) of different frequency bands, support multiple TRP functions, and / or support various types of radio links between the base station, the terminal, and the repeater, such as a backhaul link, a control link, an access link, etc.

[0425] Figure 24The example illustrates a case where some of the multiple PAs 2441, ..., and 2444 are used exclusively for downlink (ie, from the base station to the terminal), and the remaining PAs are used exclusively for uplink (ie, from the terminal to the base station). Figure 22 As described above, some specific PAs can be configured for uplink / downlink use.

[0426] The different frequency bands supported by the respective PAs 2443 and 2444 for uplink transmission may mean different frequency ranges, different cell groups (CGs), or different uplink cells (i.e., cells, uplink cells, uplink component carriers, UL CCs, CCs). The different TRPs supported by the respective PAs 2443 and 2444 for uplink transmission may mean different reception (transmission) points, or uplink channels / signals associated with different spatial relationships, uplink TCIs, or joint TCIs. Here, the uplink channels and / or signals may be, for example, PUCCH, PUSCH, SRS, RACH, etc.

[0427] The different backhaul links and control links supported by the respective PAs 2443 and 2444 for uplink transmission may represent uplink channels / signals (e.g., PUCCH, PUSCH, SRS, RACH, etc.) or channels / signals transmitted to the base station through the passband of the backhaul link of the repeater. The repeater may select at least one transmit path (TX path) or at least one receive path (RX path) to be connected to the repeater antenna according to one of the following exemplary embodiments of the present disclosure.

[0428] As an example, a specific relay may include a first PA for uplink transmission in a first uplink cell of a first cell group and a second PA for uplink transmission in a second uplink cell of a second cell group.

[0429] For another example, in a specific relay, the PA used for uplink transmission in a first uplink cell of a first cell group and the PA used for uplink transmission in a second uplink cell of a second cell group can be the same PA. In other words, a single uplink PA can be used, or the same uplink PA can be shared by multiple uplink cells.

[0430] As another example, a specific relay may include a first PA for uplink transmission in a first uplink cell for a control link and a second PA for uplink transmission in a second uplink cell (or passband) for a backhaul link.

[0431] As another example, in a certain relay, the PA used for uplink transmission in a first uplink cell for the control link and the PA used for uplink transmission in a second uplink cell (or passband) for the backhaul link can be the same PA. In other words, a single uplink PA can be used, or the same uplink PA can be shared by both the control link and the backhaul link.

[0432] Considering that the maximum value of the uplink transmission power in the above formula 5 is P CMAX (i) is determined for each uplink cell, and P for the uplink cell can be inferred CMAX (i) The various relay uplink PA configurations described above may be determined differently based on the configuration actually applied to the relay. For example, the configuration actually applied to the relay among the various relay uplink PA configurations may be determined based on the number of PAs assigned to each uplink cell or the number of uplink cells that each PA needs to support.

[0433] In the exemplary embodiments described below, a method for controlling and determining the uplink transmission power of a repeater will be described through specific examples, considering various repeater uplink PA configurations.

[0434] Furthermore, when the transmission power of the repeater is controlled by a value other than the absolute value of the transmission power (eg, a relative value such as a value for controlling the repeater gain of the received signal), the methods provided in the following exemplary embodiments can be similarly applied.

[0435] In addition, the problem that the transmit power control, allocation, or distribution of the relay may become ambiguous due to the above-mentioned multiplexing mode may also similarly arise in other operating modes. For example, such operating modes may include modes based on DL / UL direction (or DFU configuration / indication), modes based on beam direction or antenna classification, etc. In the following, in order not to obscure the key points of the description, a detailed description of all possible operating modes will be omitted, but the methods of the following exemplary embodiments can be similarly applied.

[0436] In addition, in the following exemplary embodiments, for the convenience of description, some operations of the relay-MT will be described, but in actual applications, they can be understood as operations of the terminal (UE or UT).

[0437] [First exemplary embodiment] Method for determining repeater power level

[0438] The first exemplary embodiment of the present disclosure provides a method for determining a power level of a relay. The relay may determine the power level according to one of the methods in the exemplary embodiment, and based on this, the relay may determine the maximum transmit power P that may be used for an uplink cell (e.g., within an uplink CC, a separately defined specific uplink frequency resource (e.g., an uplink passband), or a combination thereof). CMAX (i) The determined power level may be used to determine the instantaneous transmit power using Equation 5 described above or a similar method.

[0439] The terminal can determine or set the maximum uplink transmit power P CMAX (i), and P CMAX (i) may need to be within the range of Equation 6 below.

[0440] [Formula 6]

[0441] P Powerclass -f(MPR,AMPR,AMPR)≤P CMAX (i)≤EIRP max

[0442] In Formula 6, P Powerclass The minimum peak effective isotropic radiated power (EIRP) may be expressed according to a pre-agreed terminal power level, as shown in the example of Table 21 below. max The maximum EIRP according to the power level of the terminal can be expressed as shown in the example of Table 21 below. f(MPR, AMPR, PMPR) can represent a function using maximum output power reduction (MPR), MPR with additional requirements (AMPR), and power management maximum power reduction (PMPR). f(MPR, AMPR, PMPR) can have various variations. As an example of such variations, the following formula 7 or a modified form thereof can be used.

[0443] [Formula 7]

[0444] f(MPR,AMPR,PMPR)=max(max(MPR,AMPR),PMPR)+Tolerance

[0445] In formulas 6 and 7, the values ​​of MPR, A-MPR, P-MPR, and tolerance can be defined differently for different environments such as the power level, frequency band, and transmission bandwidth of the terminal. These environments will be referred to as communication configuration environments. In other words, different MPR, A-MPR, P-MPR, and tolerance values ​​can be applied according to the power level declared and / or reported by the terminal (or repeater). In order not to obscure the key points of the description of the present disclosure, detailed MPR, A-MPR, P-MPR, and tolerance values ​​are not provided in this disclosure.

[0446] [Table 21]

[0447]

[0448] In 5G NR, Rel-17 RF repeaters support three repeater power classes: wide area (WA), medium range (MR), and local area (LA). The uplink or downlink rated passband output power Pr for each power class can be determined according to Table 22 and Table 23 below. ated,p,AC .

[0449] [Table 22]

[0450]

[0451] [Table 23]

[0452]

[0453] In the case of Rel-17 RF repeaters in 5G NR, the uplink rated total radiated power (TRP) P for each power class WA or LA can be determined according to Table 24 below: rated,p,TRP and rated EIRPP rated,p,EIRP .

[0454] [Table 24]

[0455]

[0456] In the present disclosure described below, the examples of Tables 22 to 24 above and their modifications will be collectively referred to as 'maximum transmit power limit' according to technical specifications (or requirements).

[0457] The manufacturer of the repeater may report or declare information about the characteristics of the repeater to the network or mobile communication service provider through higher layer signaling or through separate operations, administration, and maintenance (OAM) signaling.

[0458] For example, the reported and / or declared information about the characteristics of the repeater may include a rated output power for a particular frequency resource unit. For example, the particular frequency resource unit may be configured as a passband, a passband group, a band, a band group, a cell, a cell group, a CC, a CC group, a BWP, a BWP group, etc.

[0459] As another example, the reported and / or declared information about the characteristics of the repeater may include a rated EIRP or a rated TRP for a particular spatial resource unit. For example, a particular spatial resource unit may be configured as an antenna, an antenna group, an antenna panel, an antenna panel group, a beam, a beam group, etc.

[0460] As another example, the reported and / or declared information about the characteristics of the repeater may include a rated EIRP or a rated TRP for a specific repeater operating mode. For example, the specific repeater operating mode may be a mode in which the backhaul link and the control link are TDM, a mode in which the backhaul link and the control link are FDM, a mode in which the backhaul link and the control link are SDM, etc.

[0461] The reported and / or declared information about the repeater characteristics may also include a combination of frequency / spatial resource units and repeater operation mode.

[0462] For example, the repeater may separately report and / or declare 'a first rated EIRP and / or rated TRP based on the first repeater beam in a mode where the backhaul link and the control link are TDM', 'a second rated EIRP and / or rated TRP based on the first repeater beam in a mode where the backhaul link and the control link are FDM', 'a third rated EIRP and / or rated TRP based on the second repeater beam in a mode where the backhaul link and the control link are TDM', and 'a fourth rated EIRP and / or rated TRP based on the second repeater beam in a mode where the backhaul link and the control link are FDM'.

[0463] The second to fourth rated EIRP and / or rated TRP for the FDM mode may not be reported / declared directly, but may be calculated from the first to third rated EIRP and / or rated TRP for the TDM mode by using the transmit power adjustment / correction value reported / declared by the repeater, configured / indicated by the base station, or pre-agreed between the two.

[0464] In the following disclosure, a method for determining the above-mentioned repeater power level (including the repeater power level for the backhaul link and all or part of the repeater-MT power level for the backhaul link or control link) is provided, taking into account various repeater implementation possibilities and repeater deployment environments.

[0465] • Method 1-1: A repeater may report or declare one or more power levels simultaneously.

[0466] For example, a first power class of the one or more power classes may be applied to the backhaul link, and a second power class of the one or more power classes may be applied to uplink transmissions on the control link, the uplink transmissions being sent by the relay-MT.

[0467] For another example, when the repeater is declared as a WA class that amplifies and forwards data signals for the backhaul link of the terminal, the first power class may follow the rated TRP and rated EIRP of the WA class defined in the above Table 24, while when the repeater is declared as a FWA UE that supports high transmit power for the control link that transmits control information for the repeater, the second power class may follow the minimum peak EIRP and maximum EIRP according to the first row of the above Table 21.

[0468] For another example, when the repeater is declared as an LA level for amplifying and forwarding data signals for the backhaul link of the terminal, the first power level may follow the rated TRP and rated EIRP of the LA level defined in the above Table 24, while when the repeater is declared as a handheld or RedCap UE that supports low transmit power for a control link that transmits control information for the repeater, the second power level may follow the minimum peak EIRP and maximum EIRP according to the third row or seventh row of the above Table 21.

[0469] As another example, a repeater may report or declare a power level for each operating mode of the repeater.

[0470] For example, when the repeater is declared to support high-transmit-power FWA UEs (assuming the backhaul and control links are TDM), the first power level may follow the minimum peak EIRP and maximum EIRP according to the first row of Table 21 above, while when the repeater is declared to support low-transmit-power handheld or RedCap UEs (assuming the backhaul and control links are TDM), the second power level may follow the minimum peak EIRP and maximum EIRP according to the third or seventh row of Table 21 above. In this case, the MPR, A-MPR, and P-MPR values ​​may also vary depending on whether the backhaul and control links are TDM, FDM, or SDM, which helps further improve the efficiency of transmit power control for each repeater operating mode.

[0471] Method 1-2: The repeater may report and / or declare a power level and additionally report a power control adjustment / correction value for that power level. The power adjustment / correction value may be committed to only apply to a specific repeater operating mode (e.g., when the backhaul link and control link are FDM or SDM) and not to apply to other operating modes (e.g., when the backhaul link and control link are TDM). Alternatively, whether the power adjustment / correction value applies may be configured via higher layer parameters or may be indicated via physical layer signaling.

[0472] For example, a relay-MT may report and / or declare a relay-MT power class of 1 (i.e., an FWA UE) and report and / or declare a power adjustment / correction value of X (e.g., -3 dB) for the FDM case of the backhaul link and control link. In this case, when the relay operates in a specific operating mode, the base station and the relay may determine the actual minimum peak EIRP and maximum EIRP by adding the power adjustment / correction value (e.g., -3 dB) to the minimum peak EIRP and maximum EIRP in the first row of Table 21 above. Here, operating in a specific mode may be, for example, a case where the backhaul link and control link are FDM and uplink transmissions occur simultaneously. In the above description, the power adjustment / correction value is assumed to be a single value, but this is for ease of description. In actual applications, one or more adjustment / correction values ​​may be reported / declared depending on the type of value to be adjusted. Here, the adjustment / correction values ​​may be determined, for example, as an adjustment / correction value X1 for the minimum peak EIRP and an adjustment / correction value X2 for the maximum EIRP.

[0473] In the above example, in addition to the power adjustment / correction value reported / declared by the terminal (repeater-MT), there may also be a separate adjustment / correction value configured / indicated by the base station based on this. In this case, the terminal (repeater-MT) can apply the adjustment / correction value configured / indicated by the base station when adjusting / correcting the power for a specific repeater operating mode. In other words, the power adjustment / correction value reported / declared by the terminal may not be applicable.

[0474] ● Methods 1-3: MPR, A-MPR, P-MPR, tolerance relaxation. The repeater may report or declare a power level and separately report or declare at least one of the MPR, A-MPR, P-MPR, and tolerance value for the power level. The MPR, A-MPR, P-MPR, and tolerance value may apply only to a specific repeater operating mode and may be promised not to apply to other operating modes, or may be configured or indicated not to apply to other operating modes through higher layer parameters or physical layer signaling. For example, a specific repeater operating mode may be a case where the backhaul link and the control link are TDM, FDM, or SDM, while other operating modes may include a case where the backhaul link and the control link are TDM.

[0475] For example, for each repeater operation mode, MPR, A-MPR, P-MPR and tolerance values ​​can be reported / declared as multiple pairs to support various repeater operation modes. Here, the repeater operation mode can be, for example, the case where the backhaul link and the control link are TDM, FDM and / or SDM.

[0476] Similarly, if the relay-MT reports / declares the terminal (relay-MT) power level 1 (i.e., FWA UE), the base station and relay may be allowed to apply smaller MPR, A-MPR, P-MPR, and tolerance values ​​than those of the terminal. For example, this may occur when the distance between the relay and the user is longer than the distance between a typical terminal and the user, and the user has a lower absorption rate of radio waves transmitted by the relay.

[0477] ●Method 1-4: The repeater may report / declare at least one of the rated output power, rated EIRP or rated TRP for a specific frequency / space resource unit or a specific repeater operation mode to the network or mobile communication service operator through higher layer signaling or separate OAM signaling, and the repeater-MT power level may be determined based on part or all of the reported / declared values.

[0478] For example, the repeater may declare to the network or operator via OAM signaling the rated EIRP value for the repeater beam A. The repeater and the base station may then use the declared rated EIRP value as the P of the repeater-MT. Powerclass The P of the repeater-MT can be derived from the above formula 6: CMAX (i).

[0479] As another example, the repeater may declare to the network or operator, through OAM signaling, a nominal EIRP value and a transmit power adjustment / correction value for repeater beam B. The repeater and the base station may then use the value obtained by adding the transmit power adjustment / correction value to the declared nominal EIRP value (or a value adjusted to take into account the transmit power adjustment / correction value) as the P value of the repeater-MT. Powerclass The P of the repeater MT can be derived from the above formula 6: CMAX (i).

[0480] [Second exemplary embodiment] Method for determining transmission power based on repeater PA structure

[0481] The present disclosure described below provides a method for determining the maximum transmit power of a repeater in consideration of various repeater implementation possibilities and repeater deployment environments.

[0482] The repeater PA structure can vary depending on whether PA per cell group is used to support CA and / or DC, whether PA per link is used to support backhaul link and control link, and whether PA per beam is used to support multiple beams simultaneously.

[0483] Figure 25 is a flowchart for describing a case where a relay needs to adjust uplink transmission power in a specific cell during NR DC operation according to an exemplary embodiment of the present disclosure.

[0484] Figure 25 The figure shows the case where the uplink transmission power is adjusted when the repeater operates under the NR DC scheme. Here, the NR DC scheme may mean that both cell groups operate with the 5G NR scheme. In addition, adjusting the uplink transmission power in a specific cell may mean that the uplink transmission power in a specific cell needs to be adjusted due to reasons such as sharing some PAs between different cell groups. In other words, Figure 25 This may correspond to a case where maximum transmission power limit information including a repeater power level is determined based on the above-described first exemplary embodiment and power adjustment is subsequently required.

[0485] refer to Figure 25 , a relay-MT operating in the NR DC scheme may calculate a power reduction amount for uplink transmission in an SCell when performing uplink transmission in two different uplink cells ( S2500 ).

[0486] The repeater may compare a threshold value with the power reduction amount calculated in step S2500 (S2510). In this case, the threshold value may be a preset value. For example, the threshold value may be a value set by a higher-layer parameter xScale. As a result of the comparison in step S2510, if the power reduction amount calculated in step S2500 is less than the threshold value, the repeater may proceed to step S2520. As a result of the comparison in step S2510, if the power reduction amount calculated in step S2500 is not less than the threshold value, in other words, if the power reduction amount calculated in step S2500 is greater than or equal to the threshold value, the repeater may proceed to step S2530.

[0487] When proceeding to step S2520 , the relay may determine that the corresponding uplink transmission is valid, and may perform uplink transmission of the SCell by applying the power reduction amount calculated in step S2500 .

[0488] On the other hand, when proceeding to step S2530, the relay may determine that the corresponding uplink transmission is invalid due to excessive power reduction, and may not perform uplink transmission for the SCell. In other words, the relay may discard the uplink transmission for the SCell.

[0489] Figure 26 A flowchart for describing a case where a relay needs to adjust uplink transmission power in a specific cell during EN DC or NE DC operation according to an exemplary embodiment of the present disclosure.

[0490] Figure 26The case where the repeater operates in EN DC or NE DC scheme is shown. In this case, one of the two cell groups can operate in LTE scheme and the other can operate in 5G NR scheme. In addition, as mentioned above Figure 25 As described in , adjusting the uplink transmission power in a specific cell may mean that the uplink transmission power in the specific cell needs to be adjusted due to reasons such as sharing some PAs between different cell groups. In other words, Figure 26 This may correspond to a case where maximum transmission power limit information including a repeater power level is determined based on the above-described first exemplary embodiment, and power adjustment is subsequently required.

[0491] refer to Figure 26 , a relay-MT operating in the EN DC or NE DC scheme may calculate a power reduction amount for uplink transmission in the NR cell when performing uplink transmission in two different uplink cells ( S2600 ).

[0492] The repeater may compare a threshold value with the power reduction amount calculated in step S2600 (S2610). In this case, the threshold value may be a preset value. For example, the threshold value may be a value set by a higher-layer parameter xScale. As a result of the comparison in step S2610, if the power reduction amount calculated in step S2600 is less than the threshold value, the repeater may proceed to step S2620. As a result of the comparison in step S2610, if the power reduction amount calculated in step S2600 is not less than the threshold value, in other words, if the power reduction amount calculated in step S2600 is greater than or equal to the threshold value, the repeater may proceed to step S2630.

[0493] When proceeding to step S2620, the relay may determine that the corresponding uplink transmission is valid, and may perform uplink transmission for the NR cell by applying the power reduction amount calculated in step S2600.

[0494] On the other hand, when proceeding to step S2630, the relay may determine that the corresponding uplink transmission is invalid due to excessive power reduction, and will not perform uplink transmission for the NR cell. In other words, the relay may discard the uplink transmission of the NR cell.

[0495] Figure 27 is a flowchart for describing a situation in which a relay needs to adjust specific uplink transmission power due to sharing of some PAs between backhaul link uplink transmission and control link uplink transmission according to an exemplary embodiment of the present disclosure.

[0496] Figure 27The figure shows a case where the repeater needs to adjust the transmit power of some PAs due to sharing between the backhaul link uplink transmission and the control link uplink transmission. As mentioned above, the repeater may need to perform power reduction on the uplink of the control link (or backhaul link) for various reasons. The operation of the repeater will refer to Figure 27 In other words, Figure 27 It can also correspond to a case where maximum transmission power limit information including a repeater power level is determined based on the above-described first exemplary embodiment, and power adjustment is subsequently required.

[0497] refer to Figure 27 , the relay may calculate the power reduction amount for uplink transmission of the control link (or backhaul link) (S2700). In step S2700, the power reduction amount for uplink transmission of the control link (or backhaul link) may be due to the following: Figure 25 and / or the CA or DC operation shown in the examples of 26, or because there are two different uplink transmissions according to FDM and / or SDM operations for backhaul link uplink transmission and control link uplink transmission.

[0498] If the power reduction is caused by FDM and / or SDM operation for both the backhaul link uplink transmission and the control link uplink transmission, the power reduction amount for the control link uplink transmission may be the difference between A1 and B1. Here, A1 may be the maximum available transmit power value when performing control link uplink transmission alone (i.e., when the backhaul link and the control link are TDM). B1 may be the maximum (or instantaneous) available transmit power value for the control link when FDM and / or SDM operation is performed for both the backhaul link uplink transmission and the control link uplink transmission.

[0499] If the power reduction is caused by FDM and / or SDM operation for both the backhaul link uplink transmission and the control link uplink transmission, the power reduction amount for the backhaul link uplink transmission may be the difference between A2 and B2. Here, A2 may be the maximum available transmit power value when performing backhaul link uplink transmission alone (i.e., when the backhaul link and the control link are TDM). B2 may be the maximum (or instantaneous) available transmit power value for the backhaul link when FDM and / or SDM operation is performed for both the backhaul link uplink transmission and the control link uplink transmission.

[0500] If the reason for the power reduction is CA / DC operation, the same Figure 25 and Figure 26 The power reduction is calculated in the same manner as described in .

[0501] When proceeding to step S2720, that is, if the required power reduction amount calculated in step S2700 is less than the threshold, the relay can determine that the corresponding uplink transmission is valid. Therefore, the relay can perform control link (or backhaul link) uplink transmission by applying power reduction (S2720).

[0502] On the other hand, when proceeding to step S2700, that is, if the required power reduction amount calculated in step S2700 is equal to or greater than the threshold, the relay may determine that the corresponding uplink transmission is invalid due to excessive power reduction, and may not perform the corresponding control link (or backhaul link) uplink transmission. In other words, the relay may discard the corresponding control link (or backhaul link) uplink transmission.

[0503] The relay may determine that uplink transmission (or downlink reception) of the backhaul link controlled by the control link that dropped the uplink transmission in step S2730 is also invalid, and may also drop uplink transmission (or downlink reception) of the backhaul link.

[0504] Thus, the relay can simultaneously ensure control link and backhaul link transmission efficiency / performance in the cell not performing power reduction among the cell performing power reduction and the cell not performing power reduction.

[0505] Figure 28 is a flowchart for describing a case where a relay needs to adjust specific uplink transmission power when some PAs are shared between backhaul link uplink transmission and control link uplink transmission according to an exemplary embodiment of the present disclosure.

[0506] and Figure 27 similar, Figure 28 The figure shows a situation where the repeater needs to adjust the transmit power of some PAs due to sharing between the backhaul link uplink transmission and the control link uplink transmission. As mentioned above, the repeater may need to perform power reduction on the uplink of the control link (or backhaul link) for various reasons. The operation of the repeater will refer to Figure 28 In other words, Figure 28 It can also correspond to a case where maximum transmission power limit information including a repeater power level is determined based on the above-described first exemplary embodiment, and power adjustment is subsequently required.

[0507] refer to Figure 28 , the relay may calculate the power reduction amount for uplink transmission of the control link (or backhaul link) (S2800). The power reduction for uplink transmission of the control link (or backhaul link) in step S2800 may be due to the following: Figure 25and / or the CA or DC operation shown in the examples of 26, or may be due to two different uplink transmissions according to FDM and / or SDM operation for the backhaul link uplink transmission and the control link uplink transmission.

[0508] If the power reduction is due to FDM and / or SDM operation for both the backhaul link uplink transmission and the control link uplink transmission, the power reduction amount for the control link uplink transmission may be the difference between A3 and B3. Here, A3 may be the maximum available transmit power value when performing control link uplink transmission alone (i.e., when the backhaul link and the control link are TDM). B3 may be the maximum (or instantaneous) available transmit power value for the control link uplink when FDM and / or SDM operation is performed for both the backhaul link uplink transmission and the control link uplink transmission.

[0509] If the power reduction is due to FDM and / or SDM operation for both the backhaul uplink transmission and the control uplink transmission, the power reduction amount for the backhaul uplink transmission may be the difference between A4 and B4. Here, A4 may be the maximum available transmit power value when performing backhaul uplink transmission alone (i.e., when the backhaul link and the control link are TDM). B4 may be the maximum (or instantaneous) available transmit power value for the backhaul uplink when FDM and / or SDM operation is performed for both the backhaul uplink transmission and the control link uplink transmission.

[0510] If the reason for the power reduction is CA / DC operation, the same Figure 25 and Figure 26 The power reduction is calculated in the same manner as described in .

[0511] When proceeding to step S2820, that is, if the required power reduction amount calculated in step S2800 is less than the threshold, the relay can determine that the corresponding uplink transmission is valid. Therefore, the relay can perform control link (or backhaul link) uplink transmission by applying the power reduction amount (S2820).

[0512] On the other hand, when proceeding to step S2830, that is, if the required power reduction amount calculated in step S2800 is equal to or greater than the threshold, the relay may determine that the corresponding uplink transmission is invalid due to excessive power reduction, and may not perform the corresponding control link (or backhaul link) uplink transmission. In other words, the relay may discard the corresponding control link (or backhaul link) uplink transmission.

[0513] The repeater may then check whether the backhaul link beam controlled by the transmission that was not performed (discarded) on the control link is the default beam. As a result of the check in step S2840, if the backhaul link controlled by the control link uses the default beam for uplink transmission, the repeater may proceed to step S2850. On the other hand, as a result of the check in step S2840, if the backhaul link controlled by the control link does not use the default beam for uplink transmission, the repeater may proceed to step S2860.

[0514] When proceeding to step S2850, that is, if the default beam is used for uplink transmission on the backhaul link, the default beam may be the beam associated with the PUCCH resource referenced by the lowest PUCCH resource identifier (PRI) whose transmission was discarded within the control link. Here, the beam associated with the PUCCH resource referenced by the lowest PRI may be indicated by one of PUCCH spatial relationship information, UL TCI, or joint TCI. If the transmission of the default beam is discarded as described above, the definition of the default beam may become ambiguous from the perspective of the base station. Therefore, in this case, the relay may discard the uplink transmission on the backhaul link after the discarded PUCCH beam.

[0515] In other words, if the backhaul link does not use the default beam, the beam used by the relay for backhaul link uplink transmission follows the separately indicated beam information, so from the perspective of the base station, the definition of the backhaul link uplink beam is not ambiguous. Therefore, in step S2860, the relay can perform uplink transmission on the backhaul link.

[0516] In the above Figures 26 to 28 In the description above, "xScale" is used as a single high-level parameter in all cases. However, this is for convenience of description only. In actual applications, separate independent parameters such as "xScale", "xScale2", and "xScale3" may be defined for each case to determine whether to apply the power reduction method for each case.

[0517] In actual implementation of a repeater, the aforementioned exemplary embodiments need not be mutually exclusive, and combinations of the various exemplary embodiments may be considered. For example, the repeater may determine the repeater power level using method 1-1 of the first exemplary embodiment while simultaneously performing transmit power reduction based on the second exemplary embodiment. Furthermore, the repeater may report to the base station which functions of the exemplary embodiments have or have not been implemented. Based on this, the base station may instruct the repeater which operation to perform via L1 signaling or higher layer signaling. Various other applications are also possible, but are omitted to avoid obscuring the main point of the explanation.

[0518] In addition, it should be noted that the above Figures 26 to 28 The operations of the repeater described in can be understood as the operations in the terminal as described above.

[0519] Figure 29 is a block diagram illustrating a base station according to an exemplary embodiment of the present disclosure.

[0520] refer to Figure 29 The base station may include a base station processing unit 2900, a base station transmitting unit 2905 and a base station receiving unit 2910. Figure 29 The components are shown as exemplary embodiments, and the base station may further include additional components according to exemplary embodiments of the present disclosure or intentions of telecommunication service operators.

[0521] For example, despite Figure 29 Although not shown, the base station may also include a memory. Furthermore, the base station may also include a wired / wireless interface for connecting to external devices. Furthermore, the base station may also include an interface that allows an operator to identify the operation of the base station. In addition to the above forms, the base station may also include additional components according to the needs of the telecommunications service operator or manufacturer.

[0522] The base station processing unit 2900 can perform determination and processing for the overall operation of the base station according to the exemplary embodiments of the present disclosure described above. For example, the base station processing unit 2900 can determine the operating mode or control the transmission of information related to the determined operating mode to the terminal through high-layer signaling or physical layer signaling. In addition, if the base station processing unit 2900 has an additional memory, the base station processing unit 2900 can control the storage of information in the memory. The base station processing unit 2900 can control the receiving operation of the base station receiving unit 2910 and the transmitting operation of the base station transmitting unit 2905. Specifically, the base station processing unit 2900 can determine which method to use in the methods of the first and second exemplary embodiments described in the present disclosure and indicate the determined method to the relay.

[0523] The base station transmitting unit 2905 may transmit data received from the base station processing unit 2900 in a downlink under the control of the base station processing unit 2900. The base station receiving unit 2910 may receive an uplink channel / signal under the control of the base station processing unit 2900 and provide it to the base station processing unit 2900.

[0524] Figure 30 is a block diagram illustrating a repeater according to an exemplary embodiment of the present disclosure.

[0525] refer to Figure 30 , the repeater may include a repeater processing unit 3000 , a repeater sending unit 3005 and a repeater receiving unit 3010 . Figure 30The components are shown as exemplary embodiments, and the repeater may further include additional components according to exemplary embodiments of the present disclosure or intentions of telecommunication service operators.

[0526] For example, although Figure 30 Although not shown in the figure, the repeater may further include a memory. In addition, the repeater may further include a wired / wireless interface for connecting to an external device.

[0527] The repeater processing unit 3000 can determine and process the overall operation of the repeater according to the exemplary embodiments of the present disclosure described above. For example, the repeater processing unit 3000 can determine and process the overall operation of the repeater according to the exemplary embodiments of the present disclosure, store various information and their programs, or control the repeater transmitting unit 3005 and the repeater receiving unit 3010 to appropriately transmit / receive signals. In addition, if the repeater processing unit 3000 also includes a memory, the repeater processing unit 3000 can control the storage of information in the memory.

[0528] The repeater transmitting unit 3005 may transmit data received from the repeater processing unit 3000 in uplink under the control of the repeater processing unit 3000. The repeater receiving unit 3010 may receive a downlink channel / signal under the control of the repeater processing unit 3000 and provide it to the repeater processing unit 3000.

[0529] The operation of the method according to the exemplary embodiments of the present disclosure can be implemented as a computer-readable program or code in a computer-readable recording medium. The computer-readable recording medium may include various recording devices for storing data that can be read by a computer system. In addition, the computer-readable recording medium can store and execute programs or codes, which can be distributed among computer systems connected via a network and read by computers in a distributed manner.

[0530] The computer readable recording medium may include a hardware device specifically for storing and executing program commands, such as ROM, RAM or flash memory. The program commands may include not only machine language codes generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter.

[0531] Although certain aspects of the present disclosure have been described in the context of a device, these aspects may be indicative of a corresponding description according to a method, and a block or device may correspond to a step or feature of a step of the method. Similarly, aspects described in the context of a method may be represented as features of a corresponding block or item or a corresponding device. Some or all of the steps of the method may be performed by (or using) a hardware device (such as a microprocessor, a programmable computer, or an electronic circuit). In some embodiments, one or more of the most important steps of the method may be performed by such a device.

[0532] In some exemplary embodiments, a programmable logic device (such as a field programmable gate array) can be used to perform some or all of the functions of the methods described herein. In some exemplary embodiments, the field programmable gate array can operate together with a microprocessor to perform one of the methods described herein. Typically, these methods are preferably performed by specific hardware devices.

[0533] The description of the present disclosure is merely illustrative in nature, and therefore, variations that do not depart from the essence of the present disclosure should fall within the scope of the present disclosure. Such variations should not be considered as departing from the spirit and scope of the present disclosure. Therefore, it should be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope defined by the appended claims.

Claims

1. A method for a wireless repeater, comprising: determining at least one repeater power level of the wireless repeater based on a communication configuration environment between the wireless repeater and a base station; reporting, to the base station, relay power level information corresponding to the determined at least one relay power level; receiving an uplink transmit power parameter from the base station through higher layer signaling; determining an uplink transmit power of the base station based on the repeater power level information and the uplink transmit power parameter; as well as Uplink transmission is performed using the determined uplink transmit power.

2. The method according to claim 1, wherein The communication configuration environment is determined based on at least one of the at least one repeater power class of the wireless repeater, a frequency band used by the wireless repeater, or a transmission bandwidth of the wireless repeater.

3. The method according to claim 1, wherein The at least one relay power level includes at least one of a first power level applied to a backhaul link or a second power level applied to uplink transmissions of a control link.

4. The method according to claim 3, wherein The first power level and the second power level are reported to the base station simultaneously.

5. The method according to claim 3, further comprising: reporting at least one of the first power level or the second power level to the base station; as well as The remaining unreported one of the first power level or the second power level is reported to the base station.

6. The method according to claim 1, further comprising: When the uplink transmit power change condition is met, calculating a power reduction value based on the transmit power change condition; as well as In response to the power reduction value being less than a threshold value based on the uplink transmit power parameter, the uplink transmit power is updated using the power reduction value.

7. The method according to claim 6, further comprising: In response to the power reduction value being equal to or greater than a threshold based on the uplink transmit power parameter, the uplink transmission is dropped.

8. The method according to claim 6, wherein: The change condition includes at least one of the following situations: when the wireless repeater performs uplink transmission of different uplink cells based on dual connection, when the wireless repeater performs different uplink transmission based on carrier aggregation of different frequency bands, when the uplink transmission of the backhaul link and the uplink transmission of the control link are frequency division multiplexing, or when the uplink transmission of the backhaul link and the uplink transmission of the control link are space division multiplexing.

9. The method according to claim 8, wherein When the change condition is a case where the uplink transmission of the return link and the uplink transmission of the control link are frequency division multiplexed, the power reduction value is calculated as the difference between the maximum available transmission power when the uplink transmission of the return link is performed alone and the maximum transmission power when the uplink transmission of the return link and the uplink transmission of the control link are performed simultaneously through frequency division multiplexing.

10. The method according to claim 8, wherein When the change condition is a situation where the uplink transmission of the return link and the uplink transmission of the control link are spatial division multiplexing, the power reduction value is calculated as the difference between the maximum available transmission power when the uplink transmission of the return link is performed alone and the maximum transmission power when the uplink transmission of the return link and the uplink transmission of the control link are performed simultaneously through spatial division multiplexing.

11. A method of a wireless repeater, comprising: determining at least one repeater power level of the wireless repeater based on a communication configuration environment between the wireless repeater and a base station; reporting, to the base station, relay power level information corresponding to the determined at least one relay power level; receiving an uplink transmit power parameter from the base station through higher layer signaling; In response to a change condition of uplink transmit power of a control link being satisfied, calculating a power reduction value based on a transmit power change condition, the uplink transmit power of the control link being determined based on the uplink transmit power parameter; as well as In response to the power reduction value being less than a threshold value based on the uplink transmit power parameter, updating the uplink transmit power of the control link using the power reduction value.

12. The method according to claim 11, further comprising: In response to the power reduction value being equal to or greater than a threshold value based on the uplink transmit power parameter, uplink transmissions on the control link are dropped.

13. The method according to claim 11, wherein The change condition includes at least one of the following situations: when the wireless repeater performs uplink transmission of different uplink cells based on dual connection, when the wireless repeater performs different uplink transmission based on carrier aggregation of different frequency bands, when the uplink transmission of the backhaul link and the uplink transmission of the control link are frequency division multiplexing, or when the uplink transmission of the backhaul link and the uplink transmission of the control link are space division multiplexing.

14. The method according to claim 13, wherein: When the change condition is a case where the uplink transmission of the return link and the uplink transmission of the control link are frequency division multiplexed, the power reduction value is calculated as the difference between the maximum available transmission power when the uplink transmission of the return link is performed alone and the maximum transmission power when the uplink transmission of the return link and the uplink transmission of the control link are performed simultaneously through frequency division multiplexing.

15. The method according to claim 13, wherein: When the change condition is a situation where the uplink transmission of the return link and the uplink transmission of the control link are spatial division multiplexing, the power reduction value is calculated as the difference between the maximum available transmission power when the uplink transmission of the return link is performed alone and the maximum transmission power when the uplink transmission of the return link and the uplink transmission of the control link are performed simultaneously through spatial division multiplexing.

16. A wireless repeater comprising a processor, wherein: The processor causes the wireless repeater to execute: determining at least one repeater power level of the wireless repeater based on a communication configuration environment between the wireless repeater and a base station; reporting, to the base station, relay power level information corresponding to the determined at least one relay power level; receiving an uplink transmit power parameter from the base station through higher layer signaling; determining an uplink transmit power for the base station based on the repeater power level information and the uplink transmit power parameter; as well as Uplink transmission is performed using the determined uplink transmit power.

17. The wireless repeater according to claim 16, wherein: The communication configuration environment is determined based on at least one of the at least one repeater power level of the wireless repeater, a frequency band used by the wireless repeater, or a transmission bandwidth of the wireless repeater, and the at least one repeater power level includes at least one of a first power level applied to a backhaul link or a second power level applied to uplink transmission of a control link.

18. The wireless repeater according to claim 17, wherein: The processor further causes the wireless repeater to: reporting the first power level and the second power level to the base station simultaneously; or At least one of the first power level or the second power level is reported to the base station, and a remaining unreported one of the first power level or the second power level is reported to the base station.

19. The wireless repeater according to claim 16, wherein: The processor further causes the wireless repeater to: When the uplink transmit power change condition is met, calculating a power reduction value based on the transmit power change condition; In response to the power reduction value being less than a threshold value based on the uplink transmit power parameter, updating the uplink transmit power using the power reduction value; as well as In response to the power reduction value being equal to or greater than a threshold value based on the uplink transmit power parameter, the uplink transmission is dropped.

20. The wireless repeater according to claim 19, wherein: The change condition includes at least one of the following situations: when the wireless repeater performs uplink transmission of different uplink cells based on dual connection, when the wireless repeater performs different uplink transmission based on carrier aggregation in different frequency bands, when the uplink transmission of the backhaul link and the uplink transmission of the control link are frequency division multiplexing, or when the uplink transmission of the backhaul link and the uplink transmission of the control link are space division multiplexing.

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