Method and apparatus for transmitting and receiving sounding reference signal in full duplex communication

Abstract

The present embodiment provides a method for a user equipment (UE) to transmit a sounding reference signal (SRS) in full duplex communication, comprising: receiving at least one power control parameter set for determining a transmission power of the sounding reference signal from a base station; determining a transmission power of the sounding reference signal based on the at least one power control parameter set; and transmitting the sounding reference signal according to the determined transmission power, wherein the transmission power of the sounding reference signal is individually determined for a case where the symbol for transmitting the sounding reference signal is an SBFD (sub-band full duplex) symbol and a case where the symbol is a non-SBFD symbol, respectively.

Description

Technical Field

[0001] The present embodiment proposes a method and apparatus for sending and receiving a sounding reference signal in full-duplex communication in a next-generation wireless access network (referred to in this disclosure as "5G," "NR [New Radio]," "5G-Advanced," "6G," or later 3GPP wireless access network). Background Art

[0002] 3GPP continues to research and develop wireless communication technologies. As representative use cases of NR, eMBB (enhanced mobile broadband), mMTC (massive machine type communications) and URLLC (ultra-reliable low latency communications) are defined, and a more flexible frame structure design is required to meet the specific needs of each use case.

[0003] Therefore, methods for effectively meeting the specific requirements of each usage scenario with respect to data rates, latency, reliability, coverage, etc., have been continuously studied.

[0004] As part of this, a specific design is needed in the wireless network that enables efficient and optimal control of the transmission power of the sounding reference signal during the time interval in which full-duplex communication is applied. Summary of the invention

[0005] Technical issues

[0006] Embodiments of the present disclosure may provide a method and apparatus for sending and receiving a sounding reference signal in full-duplex communication.

[0007] Technical Solution

[0008] On the one hand, an embodiment of the present disclosure may provide a method for a user equipment (UE) to send a sounding reference signal (SRS) in full-duplex communication (FullDuplex), comprising: receiving at least one power control parameter set for determining the transmit power of the sounding reference signal from a base station; determining the transmit power of the sounding reference signal based on at least one power control parameter set; and sending the sounding reference signal according to the determined transmit power, wherein the transmit power of the sounding reference signal is determined separately for the case where the symbol used to send the sounding reference signal is a SBFD (sub-band full-duplex) symbol and the case where the symbol is a non-SBFD symbol.

[0009] On the other hand, an embodiment of the present disclosure may provide a method for a base station to receive a sounding reference signal (SRS) in full-duplex communication (Full Duplex), comprising: sending at least one power control parameter set for determining the transmit power of the sounding reference signal to a user equipment (UE); and receiving the sounding reference signal according to the transmit power of the sounding reference signal determined based on at least one power control parameter set, wherein the transmit power of the sounding reference signal is determined separately for the case where the symbol used to receive the sounding reference signal is a SBFD (sub-band full duplex) symbol and the case where the symbol is a non-SBFD symbol.

[0010] On the other hand, an embodiment of the present disclosure may provide a user equipment (UE) for sending a sounding reference signal (SRS) in full-duplex communication (Full Duplex), the UE including a sending unit, a receiving unit and a control unit for controlling the operation of the sending unit and the receiving unit, the control unit being configured to: receive at least one power control parameter set for determining the sending power of the sounding reference signal from a base station; determine the sending power of the sounding reference signal based on at least one power control parameter set; and send the sounding reference signal according to the determined sending power, wherein the sending power of the sounding reference signal is determined separately for the cases where the symbol used to send the sounding reference signal is a SBFD (sub-band full-duplex) symbol and a non-SBFD symbol.

[0011] On the other hand, an embodiment of the present disclosure may provide a base station for receiving a sounding reference signal (SRS) in full-duplex communication (FullDuplex), the base station comprising a transmitting unit, a receiving unit and a control unit for controlling the operation of the transmitting unit and the receiving unit, the control unit being configured to: send at least one power control parameter set for determining the transmit power of the sounding reference signal to a user equipment (UE); and receive the sounding reference signal according to the transmit power of the sounding reference signal determined based on at least one power control parameter set, wherein the transmit power of the sounding reference signal is determined separately for the case where the symbol used to receive the sounding reference signal is a SBFD (sub-band full-duplex) symbol and the case where it is a non-SBFD symbol.

[0012] Effects of the Invention

[0013] Through the embodiments of the present disclosure, a method and apparatus can be provided that can effectively adjust the transmission power of a sounding reference signal in a time slot or symbol applying full-duplex communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an NR wireless communication system to which this embodiment can be applied.

[0015] Figure 2This is a diagram for describing a frame structure in an NR system to which this embodiment can be applied.

[0016] Figure 3 This is a diagram for describing a resource grid supported by the wireless access technology to which this embodiment can be applied.

[0017] Figure 4 The figure is used to describe bandwidth slices supported by the wireless access technology to which this embodiment can be applied.

[0018] Figure 5 It is a schematic diagram of a synchronization signal block in a wireless access technology to which this embodiment can be applied.

[0019] Figure 6 This is a diagram for describing a random access procedure in a wireless access technology to which this embodiment can be applied.

[0020] Figure 7 It is a diagram used to describe CORESET.

[0021] Figure 8 is a diagram illustrating a process for a UE to transmit a sounding reference signal in full-duplex communication according to an embodiment.

[0022] Fig. 9 is a diagram illustrating a process for a base station to receive a sounding reference signal in full-duplex communication according to an embodiment.

[0023] Fig.10 and Fig.11 is a diagram for describing a TDD frame in which an uplink subband is set in a downlink timeslot according to an embodiment.

[0024] Fig.12 is a diagram showing a configuration of a UE according to another embodiment.

[0025] Fig.13 is a diagram showing a configuration of a base station according to another embodiment. DETAILED DESCRIPTION

[0026] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the schematic drawings. When adding reference numerals to the elements of each drawing, the same reference numerals are assigned to the same elements as much as possible, even if they are shown on different drawings. In addition, when describing the embodiments of the present disclosure, when the detailed description of the associated known configurations and functions may make the subject matter of the technical concept of the present disclosure unclear, the detailed description will be omitted. When using the expressions "including", "having", "consisting of...", etc. as mentioned in this specification, any other parts may be added unless the expression "only" is used. When an element is expressed in the singular, the element may cover the plural case unless there is a clear and special reference to the element.

[0027] In addition, when describing the elements of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used herein. These terms are not used to limit the nature, order, sequence or quantity of the corresponding elements, but are only used to distinguish the corresponding elements from other elements.

[0028] When describing the positional relationship between elements, if two or more elements are mentioned as being "connected," "coupled," or "accessed" to each other, it should be understood that the two or more elements may be directly "connected," "coupled," or "accessed" to each other, and the two or more elements may be "connected," "coupled," or "accessed" to each other with another element "interposed" therebetween. In this case, the other element may be included in at least one of the two or more elements that are "connected," "coupled," or "accessed" to each other.

[0029] In the description of the temporal relationship related to elements, operating methods or manufacturing methods, for example, when expressions such as "after", "subsequently", "next", "before", etc. are used to describe the time sequence or process sequence, discontinuous situations may also be included, unless "immediately" or "directly" is used otherwise.

[0030] In addition, the numerical values ​​for elements or information corresponding thereto (e.g., levels, etc.) mentioned in this specification may be interpreted as including error ranges caused by various factors (e.g., process factors, internal or external impacts, noise, etc.), even if not otherwise explicitly stated.

[0031] The wireless communication system in this specification refers to a system that uses wireless resources to provide a variety of communication services (such as voice services and data services). The wireless communication system may include UE, base station, core network, etc.

[0032] The embodiments of the present disclosure disclosed below can be applied to wireless communication systems using multiple wireless access technologies. For example, the embodiments can be applied to multiple wireless access technologies, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), non-orthogonal multiple access (NOMA), etc. In addition, wireless access technology can refer not only to specific access technology, but also to various generations of communication technologies established by various communication organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, ITU, etc. For example, CDMA can be implemented as wireless technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as wireless technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate for GSM Evolution (EDGE). OFDMA can be implemented into wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, Evolved UTRA (E-UTRA), etc. IEEE802.16m is an evolution of IEEE802.16e, which provides backward compatibility with systems based on IEEE802.16e. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using Evolved UMTS Terrestrial Radio Access (E-UTRA), using OFDMA for the downlink and SC-FDMA for the uplink. As described above, the embodiments of the present disclosure can be applied to wireless access technologies that have been launched or commercialized, and can also be applied to wireless access technologies that are being developed or will be developed in the future.

[0033] In addition, the UE used in this specification should be interpreted as indicating a broad meaning of a device including a wireless communication module that communicates with a base station in a wireless communication system, which includes not only user equipment (UE) in WCDMA, LTE, NR, HSPA, IMT-2020 (5G or New Radio), etc., but also mobile stations (MS), user terminals (UT), subscriber stations (SS), wireless devices, etc. in GSM. In addition, the UE may be a portable user device such as a smart phone, or in a V2X communication system, it may be a vehicle, a device including a wireless communication module in a vehicle, etc. In the case of a machine type communication (MTC) system, the UE may refer to an MTC terminal, an M2M terminal, or a URLLC terminal, etc., equipped with a communication module capable of performing machine type communication.

[0034] The base station or cell in this specification refers to the cut-off point for communicating with the UE through the network, covering various coverage areas such as Node-B, evolved Node-B (eNB), gNode-B (gNB), low power node (LPN), sector, site, various types of antennas, base transceiver system (BTS), access point, point (e.g., transmission point, reception point or transmission / reception point), relay node, megacell, macrocell, microcell, picocell, femtocell, remote radio head (RRH), radio unit (RU), small cell, etc. In addition, the cell can be used as a meaning including bandwidth slice (BWP) in the frequency domain. For example, the serving cell can refer to the activated BWP of the UE.

[0035] The various cells listed above are all equipped with a base station that controls at least one cell, and the base station can be understood in two meanings. The base station can be 1) a device itself for providing a megacell, macrocell, microcell, picocell, femtocell or small cell associated with a wireless area, or the base station can be 2) the wireless area itself. In the description of 1) above, the base station can be a device controlled by the same entity and providing a predetermined wireless area, or it can be all devices that interact with each other and coordinately configure the wireless area. For example, depending on the configuration method of the wireless area, the embodiments of the base station can be a point, a sending / receiving point, a sending point, a receiving point, etc. In the description 2) above, the base station may also refer to the wireless area itself for the UE or an adjacent base station to receive or send signals.

[0036] In this specification, a cell may refer to a coverage of a signal transmitted from a transmission / reception point, a component carrier having coverage of a signal transmitted from a transmission / reception point (or transmission point), or a transmission / reception point itself.

[0037] Uplink (UL) refers to the way data is sent from the UE to the base station, and downlink (DL) refers to the way data is sent from the base station to the UE. The downlink may represent the communication or communication path from multiple transmission / reception points to the UE, and the uplink may represent the communication or communication path from the UE to the multiple transmission / reception points. In the downlink, the transmitter may be part of the multiple transmission / reception points, and the receiver may be part of the UE. In addition, in the uplink, the transmitter may be part of the UE, and the receiver may be part of the multiple transmission / reception points.

[0038] Uplink and downlink send and receive control information through control channels such as Physical Downlink Control Channel (PDCCH) and Physical Uplink Control Channel (PUCCH), and send and receive data through configured data channels such as Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH). Hereinafter, the situation of sending and receiving signals through channels such as PUCCH, PUSCH, PDCCH, PDSCH, etc. may also be expressed as "sending and receiving PUCCH, PUSCH, PDCCH, PDSCH, etc.".

[0039] For clarity, the following description will mainly focus on 3GPP LTE / LTE-A / NR (New Radio) communication systems, but the technical features of the present disclosure are not limited to these communication systems.

[0040] After studying 4G (Fourth Generation) communication technologies, 3GPP developed 5G (Fifth Generation) communication technologies to meet the requirements of ITU-R's next-generation radio access technologies. Specifically, 3GPP has developed LTE-Apro, which is an improvement of LTE-Advanced technology according to the requirements of ITU-R, and new NR communication technologies that are completely different from 4G communication technologies, as 5G communication technologies. Both LTE-Apro and NR refer to 5G communication technologies. Hereinafter, unless a specific communication technology is specified, 5G communication technologies will be mainly described around NR.

[0041] NR defines multiple operation scenarios in existing 4G LTE scenarios by further considering satellites, automobiles, new vertical fields, etc., to support enhanced mobile broadband (eMBB) scenarios, massive machine-type communication (mMTC) scenarios (where a high UE density is distributed over a wide area and requires low data rates and asynchronous access), and ultra-reliable low-latency (URLLC) scenarios (requiring high responsiveness and reliability and supporting high-speed mobility) in terms of services.

[0042] To meet such scenarios, NR discloses a wireless communication system that employs new waveform and frame structure technologies, low-latency technologies, ultra-high frequency band (mmWave) support technologies, and forward compatibility provision technologies. In particular, the NR system has made various technical changes in terms of flexibility to provide forward compatibility. The main technical features of NR will be described below with reference to the accompanying drawings.

[0043] <Overview of NR System>

[0044] Figure 1 is a schematic structural diagram of an NR wireless communication system to which this embodiment can be applied.

[0045] Reference Figure 1, the NR system is divided into a 5G core network (5GC) and an NG-RAN part. The NG-RAN includes gNBs and ng-eNBs that provide the user plane (SDAP / PDCP / RLC / MAC / PHY) and the control plane (RRC) protocol terminations for user equipment (UE). gNBs are connected to each other or to ng-eNBs via the Xn interface. gNBs and ng-eNBs are connected to the 5GC via the NG interface respectively. The 5GC can be configured to include an access and mobility management function (AMF) for managing the control plane (such as UE access and mobility control functions, etc.) and a user plane function (UPF) responsible for controlling user data. NR supports frequency bands below 6 GHz (FR1, frequency range 1) and frequency bands equal to or greater than 6 GHz (FR2, frequency range 2).

[0046] A gNB refers to a base station that provides the NR user plane and control plane protocol terminations for a UE, and an ng-eNB refers to a base station that provides the E-UTRA user plane and control plane protocol terminations for a UE. The base stations described in this specification should be understood to cover gNBs and ng-eNBs. However, if necessary, the base station can also be used to distinguish and refer to gNBs or ng-eNBs.

[0047] <NR Waveform, Parameter Set, and Frame Structure>

[0048] NR uses the CP-OFDM waveform with a cyclic prefix for downlink transmission and uses CP-OFDM or DFT-s-OFDM for uplink transmission. The OFDM technology has the following advantages: it is very easy to combine with the multiple-input multiple-output (MIMO) scheme and allows the use of a low-complexity receiver with high frequency efficiency.

[0049] In addition, since the above three scenarios in NR have different requirements for data rate, latency rate, coverage range, etc., respectively, it is necessary to efficiently meet the requirements of each scenario through the frequency bands that make up any NR system. For this purpose, a technique for effectively multiplexing radio resources based on multiple different numerologies has been proposed.

[0050] Specifically, the NR transmission parameter set is determined based on the subcarrier spacing and the cyclic prefix (CP), and as shown in Table 1 below, "μ" is used as the exponential value of 2, so that it changes exponentially based on 15 kHz.

[0051] [Table 1]

[0052] μ Subcarrier spacing Cyclic prefix Support for data Support for synchronization 0 15 conventional yes yes 1 30 conventional yes yes 2 60 General, Extended yes no 3 120 conventional yes yes 4 240 conventional no yes

[0053] As shown in Table 1 above, NR can have five parameter sets according to the subcarrier spacing. This is different from LTE, one of the 4G communication technologies, in which the subcarrier spacing is fixed to 15kHz. Specifically, in NR, the subcarrier spacing for data transmission is 15, 30, 60 or 120kHz, and the subcarrier spacing for synchronization signal transmission is 15, 30, 120 or 240kHz. In addition, the extended CP is only applied to the subcarrier spacing of 60kHz. A frame with a length of 10ms is defined in the frame structure in NR, which includes 10 subframes, each subframe having the same length of 1ms. A frame can be divided into half frames of 5ms, each half frame including 5 subframes. When the subcarrier spacing is 15kHz, a subframe includes 1 time slot, and each time slot includes 14 OFDM symbols. Figure 2 This is a diagram for describing a frame structure in an NR system to which this embodiment can be applied.

[0054] refer to Figure 2 , a time slot includes 14 OFDM symbols fixedly in the case of a conventional CP, but the length of the time slot in the time domain may vary according to the subcarrier spacing. For example, in the case of a parameter set with a subcarrier spacing of 15kHz, the time slot is configured to have a length of 1ms, which is the same as the length of a subframe. In contrast, in the case of a parameter set with a subcarrier spacing of 30kHz, a time slot includes 14 OFDM symbols, but a subframe may include two time slots, each of which has a length of 0.5ms. That is, a subframe and a frame may be defined using a fixed time length, and a time slot may be defined as the number of symbols so that its time length varies according to the subcarrier spacing.

[0055] In addition, NR defines the basic unit of scheduling as a time slot, and also introduces micro-time slots (or sub-time slots or non-time slot-based scheduling) to reduce the transmission delay of the wireless part. If a wide subcarrier spacing is used, the length of a time slot is shortened inversely proportional to it, thereby reducing the transmission delay in the wireless part. Micro-time slots (or sub-time slots) are designed to effectively support URLLC scenarios, and micro-time slots can be scheduled in units of 2, 4, or 7 symbols.

[0056] In addition, unlike LTE, NR defines uplink and downlink resource allocation in one slot at the symbol level. In order to reduce HARQ latency, a slot structure has been defined that enables HARQ ACK / NACK to be sent directly in the transmission slot. This slot structure is called a "self-contained structure" to describe it.

[0057] NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in 3GPP Rel-15. In addition, NR supports a common frame structure that constitutes an FDD or TDD frame through a combination of multiple slots. For example, NR supports a slot structure in which all symbols of a slot are configured for downlink, a slot structure in which all symbols are configured for uplink, and a slot structure in which downlink symbols and uplink symbols are mixed. In addition, NR supports data transmission that is scheduled and distributed to at least one slot. Therefore, the base station can use a Slot Format Indicator (SFI) to notify the UE whether the slot is a downlink slot, an uplink slot, or a flexible slot. The base station can notify the slot format by indicating the index of a table configured by UE-specific RRC signaling using the SFI. The base station can also dynamically indicate the slot format through Downlink Control Information (DCI), or statically or semi-statically indicate the slot format through RRC signaling.

[0058] <Physical Resources of NR>

[0059] Regarding the physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, bandwidth slices, etc. are considered.

[0060] An antenna port is defined such that the channel carrying the symbol on the antenna port can be inferred from another channel carrying another symbol on the same antenna port. If the large-scale properties of the channel carrying the symbol on one antenna port can be inferred from another channel carrying the symbol on another antenna port, the two antenna ports can be said to have a QC / QCL (Quasi Co-Located) relationship. The large-scale properties include at least one of delay spread, Doppler spread, frequency shift, average received power, and reception timing.

[0061] Figure 3 is a diagram for describing the resource grid supported by the radio access technology to which this embodiment can be applied.

[0062] Refer to Figure 3 , since NR supports multiple parameter sets in the same carrier, there can be one resource grid per parameter set. In addition, the resource grid can exist according to antenna ports, subcarrier spacing, or transmission direction.

[0063] A resource block includes 12 subcarriers and is defined only in the frequency domain. In addition, a resource element includes 1 OFDM symbol and 1 subcarrier. Therefore, as Figure 3 shown, the size of one resource block can vary according to the subcarrier spacing. In addition, "Point A" that serves as a common reference point for the resource block grid, as well as common resource blocks and virtual resource blocks, are defined in NR.

[0064] Figure 4 It is a diagram for describing the bandwidth sharding supported by the radio access technology to which this embodiment can be applied.

[0065] In NR, different from LTE where the carrier bandwidth is fixed at 20 MHz, the maximum carrier bandwidth is set to 50 MHz to 400 MHz according to the subcarrier spacing. Therefore, it is not assumed that all UEs use all these carrier bandwidths. Thus, in NR, as Figure 4 shown, bandwidth partials (BWPs) can be specified within the carrier bandwidth and used by the UE. In addition, a bandwidth partial is associated with a parameter set and consists of a subset of consecutive common resource blocks. The bandwidth partial can be dynamically activated over time. For a UE, up to four bandwidth partials can be configured for each of the uplink and downlink, such that the data is sent / received using the bandwidth partial activated at a given time.

[0066] In the case of paired spectrum, the uplink and downlink bandwidth partials are configured independently. In the case of unpaired spectrum, the uplink and downlink bandwidth partials are configured in pairs to share the center frequency, aiming to prevent unnecessary frequency re-tuning between downlink and uplink operations.

[0067] <NR Initial Access>

[0068] In NR, the UE performs a cell search process and a random access process to access the base station and communicate.

[0069] In the cell search process, the UE uses the synchronization signal block (SSB) sent by the base station to synchronize with the cell of the base station, obtain the physical layer cell ID, and obtain the system information.

[0070] Figure 5 It is a schematic diagram of the synchronization signal block in the radio access technology to which this embodiment can be applied.

[0071] Refer to Figure 5 , the SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) that respectively occupy one symbol and 127 subcarriers, and a physical broadcast channel (PBCH) that spans three OFDM symbols and 240 subcarriers.

[0072] The UE listens for the SSB in the time domain and frequency domain to receive the SSB.

[0073] SSB can be transmitted up to 64 times within 5ms. Multiple SSBs are transmitted on different transmission beams within 5ms, and the UE performs detection based on the assumption that SSB is transmitted every 20ms period based on one specific beam used for transmission. The number of beams available for SSB transmission within 5ms can increase as the frequency band increases. For example, up to 4 SSB beam transmissions can be performed on frequency bands below 3GHz, up to 8 different beams can be used to transmit SSB on frequency bands from 3 to 6GHz, and up to 64 different beams can be used to transmit SSB on frequency bands of 6GHz or higher.

[0074] One slot includes two SSBs. The starting symbol and the number of repetitions in the slot are determined as follows according to the subcarrier spacing.

[0075] In addition, unlike the existing SS of LTE, SSB is not sent at the center frequency of the carrier bandwidth. In other words, SSB can be sent even at the center of the non-system frequency band. When broadband operation is supported, multiple SSBs can be transmitted in the frequency domain. Accordingly, the UE monitors the SSB using a synchronization raster as a candidate frequency position for monitoring SSB. NR newly defines a carrier raster and a synchronization raster as center frequency position information about the channel used for initial access. The synchronization raster has a wider frequency interval than the carrier raster, and therefore can support the UE to perform fast SSB searches.

[0076] The UE can obtain the master information block (MIB) through the PBCH of the SSB. The master information block (MIB) includes the minimum information for the UE to receive the remaining system information (e.g., the remaining minimum system information (RMSI)) broadcast by the network. In addition, the PBCH may include information about the position of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (e.g., SIB1 parameter set information, information related to SIB1 CORESET, search space information, PDCCH-related parameter set information, etc.), offset information between common resource blocks and SSBs (the absolute position of SSBs within the carrier is transmitted through SIB1), etc. Among them, the SIB1 parameter set information is also applicable to a part of the messages used in the random access process for the UE to access the base station after completing the cell search process. For example, the parameter set information of SIB1 can be applied to at least one of messages 1 to 4 of the random access process.

[0077] The above-mentioned RMSI may be system information block 1 (SIB1). SIB1 is broadcast periodically (e.g., 160ms) in the cell. SIB1 includes information required for the UE to perform the initial random access procedure, and SIB1 is periodically transmitted through the PDSCH. In order to receive SIB1, the UE needs to receive parameter set information for SIB1 transmission and control resource set (CORESET) information for SIB1 scheduling through the PBCH. The UE uses the SI-RNTI in the CORESET to identify the configuration information for SIB1, and obtains SIB1 on the PDSCH according to the configuration information. The remaining SIBs except SIB1 may be transmitted periodically or at the request of the UE.

[0078] Figure 6 This is a diagram for describing a random access procedure in a wireless access technology to which this embodiment can be applied.

[0079] refer to Figure 6 , when the cell search is completed, the UE sends a random access preamble for random access to the base station. The random access preamble is transmitted through the PRACH. Specifically, the random access preamble is sent to the base station in a specific time slot that is repeated periodically through the PRACH composed of continuous radio resources. In general, when the UE initially accesses a cell, a contention-based random access procedure is performed, and when random access is performed for beam failure recovery (BFR), a non-contention-based random access procedure is performed.

[0080] The UE receives a random access response in response to the transmitted random access preamble. The random access response may include a random access preamble identifier (ID), uplink radio resources (UL grant), a temporary cell radio network temporary identifier (C-RNTI), and a time alignment command (TAC). Since a random access response may include random access response information for at least one UE, a random access preamble identifier may be included to indicate which UE the UL grant, temporary C-RNTI, and TAC included in the random access response are valid for. The random access preamble identifier may be an identifier for a random access preamble received by a base station. TAC may be included as information for the UE to adjust uplink synchronization. The random access response may be indicated by a random access identifier (i.e., a random access radio network temporary identifier (RA-RNTI)) on a PDCCH.

[0081] After receiving a valid random access response, the UE processes the information included in the random access response and performs a scheduled transmission to the base station. For example, the UE applies the TAC and stores the temporary C-RNTI. In addition, the UE uses the UL grant to send data stored in the UE's cache or newly generated data to the base station. In this case, it is necessary to include information that can identify the UE.

[0082] Finally, the UE receives a downlink message for contention resolution.

[0083] <NR CORESET>

[0084] In NR, the downlink control channel is transmitted in a control resource set (CORESET) with a length of 1 to 3 symbols, which transmits uplink and downlink configuration information, time slot format index (SFI), transmit power control (TPC) information, etc.

[0085] In this way, NR introduces the concept of CORESET to ensure the flexibility of the system. Control resource set (CORESET) refers to the time-frequency resources used for downlink control signals. The UE can use at least one search space in the CORESET time-frequency resources to decode candidate control channels. A CORESET-specific quasi-co-location (QCL) assumption is configured to notify the simulated beam direction related characteristics in addition to the delay spread, Doppler spread, Doppler shift and average delay that are characteristics assumed by the existing QCL.

[0086] Figure 7 It is a diagram describing CORESET.

[0087] refer to Figure 7 , CORESET can exist in multiple forms within the carrier bandwidth within a time slot. In the time domain, a CORESET can be composed of up to 3 OFDM symbols. In addition, a CORESET is defined in the frequency domain as a multiple of 6 resource blocks, but not exceeding the carrier bandwidth.

[0088] The first CORESET is indicated as part of the initial bandwidth slice through the MIB, so that additional configuration information and system information can be received from the network. After establishing a connection with the base station, the UE can receive and configure at least one CORESET information through RRC signaling.

[0089] Widerbandwidth operations

[0090] In the case of the existing LTE system, scalable bandwidth operation is supported for any LTC CC (component carrier). That is, according to the frequency deployment scenario, any LTE operator can configure a bandwidth from a minimum of 1.4MHz to a maximum of 20MHz when configuring one LTE CC, and ordinary LTE UE can support 20MHz bandwidth transmission and reception capabilities for one LTE CC.

[0091] However, in the case of NR, it is designed to be able to support NR UEs with different transmit and receive bandwidth capabilities through one wideband NR CC. Accordingly, one or more bandwidth slices (BWPs) consisting of subdivided bandwidths are configured for any NR CC to support flexible wider bandwidth operations by configuring and activating different bandwidth slices for each UE.

[0092] Specifically, in NR, it is defined as configuring one or more bandwidth slices through a service cell configured from the perspective of the UE, and the UE can activate one downlink bandwidth slice and one uplink bandwidth slice for transceiving uplink and downlink data. In addition, when multiple service cells are configured for the UE, that is, for a UE to which CA is applied, it is defined as activating one downlink bandwidth slice and / or uplink bandwidth slice for each service cell to use the radio resources of the corresponding service cell for transceiving uplink / downlink data.

[0093] Specifically, an initial bandwidth slice for an initial access procedure of a UE may be defined in any serving cell, and one or more UE-specific bandwidth slices may be configured for each UE through dedicated RRC signaling, and a default bandwidth slice for fallback operation may be defined for each UE.

[0094] Although it can be defined as activating multiple downlink and / or uplink bandwidth slices for use simultaneously in any serving cell according to the UE's capability and bandwidth slice configuration, it is defined in NR rel-15 that any UE activates only one downlink bandwidth slice and one uplink bandwidth slice for use at any time.

[0095] In this specification, frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals or various messages related to NR (New Radio) may be interpreted as the meaning used in the past or present, or multiple meanings used in the future.

[0096] Hereinafter, a method for transmitting and receiving a sounding reference signal (SRS) in full-duplex communication will be described in detail with reference to related drawings.

[0097] Figure 8 is a diagram illustrating a process 800 for a UE to send a sounding reference signal in full-duplex communication according to an embodiment.

[0098] Reference Figure 8 , the UE may receive at least one power control parameter set for determining the transmit power of a sounding reference signal from a base station (S810).

[0099] The UE may receive time division duplex (TDD) configuration information. TDD is a method of dividing a time interval radio resource into downlink time slots and uplink time slots for use, and the UE may receive TDD configuration information from a base station to determine the format of a symbol within a time slot. In this case, the TDD configuration information may include configuration information about the time slot format and configuration information for determining the format of a symbol within a time slot, and the information may be received through high-layer signaling or physical layer (L1) signaling.

[0100] That is, downlink symbols, uplink symbols, and flexible symbols with undetermined transmission directions of a specific period can be set through an RRC message for setting a corresponding UL-DL time slot. In addition, the UE can receive UE-specific RRC signaling, which is used to reallocate flexible symbols among the symbols set by cell-specific RRC signaling as uplink symbols, downlink symbols, or flexible symbols for each UE.

[0101] Alternatively, the UE may also receive an indication of a dynamic time slot format via a UE group common PDCCH. According to an example, the UE may dynamically receive an indication of a time slot format via DCI format 2_0.

[0102] In addition, the TDD configuration information may include a reference subcarrier spacing (reference SCS) that can be applied to the serving cell, mode 1, and mode 2 related information. At this time, the TDD configuration information may provide only mode 1, or may provide mode 1 and mode 2. In addition, the TDD configuration information may include time slot configuration cycle information for each mode. The UE may set a time slot type for each of the first number of time slots as indicated by mode 1, and when mode 2 is provided, the UE may set a time slot type for each of the second number of time slots as indicated by mode 2.

[0103] The UE can receive subband full-duplex (SBFD) subband configuration information. Full-duplex communication is a technology that allows the base station to use the same wireless resource for downlink transmission and uplink reception at the same time. The UE side can also perform downlink reception and uplink transmission at the same time. When the base station supports full-duplex communication based on subband non-overlapping, specific frequency resources within the same symbol in the TDD carrier are used for downlink transmission, while other frequency resources can be used for uplink reception. That is, within the TDD carrier, part of the frequency resources in any downlink time slot or downlink symbol can be configured for uplink transmission of the UE, or used as flexible symbols for downlink / uplink transition.

[0104] To this end, the UE may receive SBFD subband configuration information for full-duplex communication. That is, the UE may receive configuration information for configuring a downlink subband in an uplink time slot or configuring an uplink subband in a downlink time slot. The SBFD subband configuration information may include frequency domain related information and time domain related information for configuring an uplink subband or a downlink subband. Alternatively, the subband configuration information may include frequency domain related information and time domain related information for configuring a guard band. Here, the frequency resource information may include continuous resource block allocation information, and the time resource information may include continuous SBFD symbol allocation information.

[0105] For SBFD subband configuration, time resource information for uplink subband can be set based on reference subcarrier spacing (reference SCS) information and pattern setting information. In this case, time resource information can be set based on reference subcarrier spacing (SCS) included in TDD configuration information. That is, as described above, the reference subcarrier spacing (reference SCS) setting included in the TDD configuration information can be used as a reference SCS for setting time resources for configuring uplink subband.

[0106] In addition, the time resource information can be set based on the number of TDD modes and the period of the mode included in the TDD configuration information. That is, as described above, the settings for mode 1 and mode 2 included in the TDD configuration information can be used as mode setting information for setting time resources for configuring uplink subbands.

[0107] In this case, the SBFD symbol allocation information can be set using the SBFD symbols that are respectively continuous within the period of the TDD mode set to one or two. Each mode setting information may include period setting information, offset information, and duration information of the corresponding mode. At this time, the interval information can be set to the number of continuous SBFD symbols starting from the offset, or can be set to a combination of the number of continuous SBFD time slots and the number of continuous SBFD symbols. Alternatively, according to an example, the offset can be set to a cutoff point instead of a starting point. That is, the offset information corresponding to the cutoff point and the interval information starting from the cutoff point can also be set.

[0108] For SBFD subband configuration, the frequency resource setting information for the uplink subband can be set in units of common resource blocks (CRBs). In this case, the frequency resource setting for the uplink subband can be accompanied by the guard band setting or the downlink subband setting in the same symbol / time slot. That is, the frequency resource setting information for the uplink subband may include at least one of the frequency resource setting information for the guard band or the downlink subband accompanying in the SBFD time slot or SBFD symbol configuring the uplink subband. In this case, the time resource setting information for the guard band or the downlink subband can be set to follow the time resource setting information for the uplink subband.

[0109] According to an example, for SBFD subband configuration, the frequency resource information for the uplink subband may include setting information for one uplink subband and one or two guard bands based on CRB. At this time, when the uplink subband is located at the center of the frequency band, two guard bands may be configured above and below the uplink subband. On the contrary, when the uplink subband is located at the upper boundary of the frequency band, a guard band may be configured below the uplink subband. Alternatively, when the uplink subband is located at the lower boundary of the frequency band, a guard band may be configured above the uplink subband. Therefore, setting information for one or two guard bands may be included in the frequency resource information. In this case, the downlink subband may be configured across the guard band, and the downlink subband may be inferred based on the frequency resource information for the uplink subband and the guard band.

[0110] According to another example, for SBFD subband configuration, the frequency resource information for the uplink subband may include setting information for one uplink subband and one or two downlink subbands based on CRB. At this time, when the uplink subband is located at the center of the frequency band, two downlink subbands can be configured above and below the uplink subband. On the contrary, when the uplink subband is located at the upper boundary of the frequency band, a downlink subband can be configured below the uplink subband. Alternatively, when the uplink subband is located at the lower boundary of the frequency band, a downlink subband can be configured above the uplink subband. Therefore, setting information for one or two downlink subbands can be included in the frequency resource information. In this case, a guard band can be configured between the uplink subband and the downlink subband, and the guard band can be inferred based on the frequency resource information for the uplink subband and the downlink subband.

[0111] According to an example, the SBFD subband configuration information may be received through cell-specific high-layer signaling. That is, the UE may receive the SBFD subband configuration information from the base station through cell-specific RRC signaling. The UE may receive the TDD configuration information and the SBFD subband configuration information to configure the format of each time slot.

[0112] When the UE receives configuration information for a sounding reference signal from the base station, the UE may determine the transmit power to transmit the sounding reference signal according to the configuration information. To this end, the UE may use at least one power control parameter set received from the base station.

[0113] When a sounding reference signal is transmitted according to configuration information for the sounding reference signal through a time slot (i) in an activated uplink bandwidth slice (b) of a carrier (f) of a serving cell (c) to which the UE is connected, the transmission power of the sounding reference signal may be determined according to the following mathematical formula 1. The power control parameter set may include a parameter or a parameter set for each of the parameters constituting mathematical formula 1.

[0114] [Mathematical formula 1]

[0115]

[0116] [dBm]

[0117] here, It is the maximum transmission power value parameter configured on the corresponding frequency carrier for sending the sounding reference signal. In addition, is the target received power parameter at the base station, is a parameter for partial path-loss compensation, both of which are parameters related to open-loop power control. According to an example, the maximum transmit power value parameter and the open-loop power control related parameter can be received through high-layer signaling such as RRC signaling. Alternatively, the parameter can be calculated based on other parameters received through high-layer signaling.

[0118] In addition, h b，f，c (i, l) = f b，f，c (i, l), and f b，f，c (i, l) is a PUSCH transmission power adjustment parameter, which is a parameter related to closed-loop power control that is adjusted according to a TPC command (transmission power control command) value instructed by the base station.

[0119] In addition, M SRS，b，f，c (i) is based on a power adjustment parameter depending on bandwidth of configuration information for a sounding reference signal.

[0120] In this case, the above parameters can be configured differently according to the case where the type of symbol used to send the sounding reference signal is an SBFD symbol and the case where the symbol is a non-SBFD symbol. Therefore, the power control parameter set may include parameters or parameter sets for the case involving SBFD symbols and the case involving non-SBFD symbols, respectively.

[0121] Refer again Figure 8 , the UE may determine a transmit power of a sounding reference signal based on at least one power control parameter set (S820), and transmit the sounding reference signal according to the determined transmit power (S830).

[0122] The transmission power of the sounding reference signal may be determined separately for the case where the symbol used to transmit the sounding reference signal is an SBFD symbol and the case where the symbol used to transmit the sounding reference signal is a non-SBFD symbol. That is, the UE may determine the transmission power used to transmit the sounding reference signal differently according to the type of symbol allocated for transmitting the sounding reference signal. To this end, the UE may determine the transmission power by selecting a parameter depending on the type of symbol to be used to transmit the sounding reference signal from among the parameters for the case involving the SBFD symbol and the parameters for the case involving the non-SBFD symbol included in the power control parameter set.

[0123] According to an example, the transmission power of the sounding reference signal may be determined based on the maximum SRS transmission power parameters separately configured for the case involving the SBFD symbol and the case involving the non-SBFD symbol. That is, the maximum SRS transmission power parameter may be separately configured for each type of symbol used to transmit the sounding reference signal and included in one power control parameter set.

[0124] Therefore, when sending a sounding reference signal in a non-SBFD symbol, the UE can determine the transmit power by applying the maximum transmit power value parameter corresponding to the non-SBFD symbol. When sending a sounding reference signal in a SBFD symbol, the UE can determine the transmit power by applying the maximum transmit power value parameter corresponding to the SBFD symbol.

[0125] According to another example, the transmission power of the sounding reference signal may be determined based on at least one open-loop power control parameter separately configured for a case involving an SBFD symbol and a case involving a non-SBFD symbol. That is, at least one open-loop power control parameter may be separately configured for each type of symbol used to transmit the sounding reference signal and included in one power control parameter set.

[0126] As described above, the open loop power control parameters may include target received power parameters at the base station. In addition, the open loop power control parameters may include parameters for partial path loss compensation, which are obtained by adjusting the downlink path loss measured by a specific downlink reference signal by a specific ratio value.

[0127] Therefore, when the sounding reference signal is transmitted in a non-SBFD symbol, the UE can determine the transmission power by applying the open-loop power control parameters corresponding to the non-SBFD symbol. When the sounding reference signal is transmitted in the SBFD symbol, the UE can determine the transmission power by applying at least one of the open-loop power control parameters corresponding to the SBFD symbol. That is, at least one of the target received power parameter configured for the SBFD symbol and the specific ratio value can be applied.

[0128] In addition, the transmission power of the sounding reference signal can be determined based on the path loss measurement values ​​of the reference signals separately configured for the case involving SBFD symbols and the case involving non-SBFD symbols. That is, the reference signal as the object of measuring the path loss can be configured differently according to the type of symbol.

[0129] In this case, the reference signal may be received through a symbol of the same type as the symbol used to transmit the sounding reference signal. For example, when the CSI-RS is used as a reference signal, if the symbol used to transmit the sounding reference signal is a non-SBFD symbol, the UE may measure the path loss only for the CSI-RS received through the non-SBFD symbol. If the symbol used to transmit the sounding reference signal is a SBFD symbol, the UE may measure the path loss only for the CSI-RS received through the SBFD symbol.

[0130] According to another example, the transmission power of the sounding reference signal may be determined based on closed-loop power control commands separately indicated for a case involving an SBFD symbol and a case involving a non-SBFD symbol. That is, at least one closed-loop power control command may be configured for each type of symbol used to transmit the sounding reference signal and included in one power control parameter set.

[0131] In this case, the closed-loop power control command may be indicated by a TPC command (transmit power control command) configured separately for a case involving an SBFD symbol and a case involving a non-SBFD symbol, or may be indicated by a TPC command including symbol type indication information. For example, the parameters determined by the TPC command may be used to determine the closed-loop power control related parameters of Mathematical Formula 1.

[0132] According to another example, the transmission power of the sounding reference signal can be determined based on the power offset value configured for the case involving SBFD symbols. That is, the power offset value can be configured when the symbol type used to transmit the sounding reference signal is a SBFD symbol and included in a power control parameter set.

[0133] Therefore, when the sounding reference signal is transmitted in a non-SBFD symbol, the UE can determine the transmit power without further applying the power offset value.When the sounding reference signal is transmitted in a SBFD symbol, the UE can determine the transmit power by applying the power offset value corresponding to the SBFD symbol.

[0134] For example, when a sounding reference signal is sent in an SBFD symbol, the UE may add or subtract a power offset value in Math 1. Alternatively, when a sounding reference signal is sent in an SBFD symbol, the UE may multiply the power offset value in Math 1. Alternatively, when a sounding reference signal is sent in an SBFD symbol, the UE may apply the power offset value to at least one of the parameters constituting Math 1. In this case, the power offset value may also be configured separately for each parameter constituting Math 1.

[0135] Hereinabove, examples in which each parameter constituting Mathematical Formula 1 is differently applied according to the type of symbol have been described, and these examples may be applied independently, or two or more examples may be applied in combination.

[0136] Thus, a method and apparatus capable of effectively adjusting the transmission power of a sounding reference signal in a time slot or symbol to which full-duplex communication is applied can be provided.

[0137] Fig. 9 FIG. 9 is a diagram showing a process 900 for a base station to receive a sounding reference signal in full-duplex communication according to an embodiment. Figure 8 The contents described in the foregoing description are omitted to avoid repeated description, and in this case, as long as they do not conflict with the technical concept of the present invention, the omitted contents can also be applied to the base station in a substantially identical manner.

[0138] Reference Fig. 9 , the base station may send at least one power control parameter set for determining the transmit power of a sounding reference signal to the UE (S910).

[0139] The base station may send time division duplex (TDD) configuration information. TDD is a method of dividing time interval radio resources into downlink time slots and uplink time slots for use, and the base station may send TDD configuration information for determining the format of symbols in the time slot to the UE. In this case, the TDD configuration information may include configuration information about the time slot format and configuration information for determining the format of symbols in the time slot, and the information may be sent through high-layer signaling or physical layer (L1) signaling.

[0140] That is, downlink symbols, uplink symbols, and flexible symbols with undetermined transmission directions of a specific period can be set through an RRC message for setting a corresponding UL-DL time slot. In addition, the base station can send UE-specific RRC signaling, which is used to reallocate flexible symbols among the symbols set by cell-specific RRC signaling as uplink symbols, downlink symbols, or flexible symbols for each UE.

[0141] Alternatively, the base station may also indicate the dynamic time slot format through a UE group common PDCCH. According to an example, the base station may dynamically indicate the time slot format through DCI format 2_0.

[0142] In addition, the TDD configuration information may include a reference subcarrier spacing (reference SCS) that can be applied to the serving cell, mode 1, and mode 2 related information. At this time, the TDD configuration information may provide only mode 1, or may provide mode 1 and mode 2. In addition, the TDD configuration information may include time slot configuration cycle information for each mode. The UE may set a time slot type for each of the first number of time slots as indicated by mode 1, and when mode 2 is provided, the UE may set a time slot type for each of the second number of time slots as indicated by mode 2.

[0143] The base station can send sub-band full-duplex (SBFD) sub-band configuration information. Full-duplex communication is a technology that allows the base station to use the same wireless resource for downlink transmission and uplink reception at the same time. The UE side can also perform downlink reception and uplink transmission at the same time. When the base station supports full-duplex communication based on non-overlapping sub-bands, specific frequency resources within the same symbol in the TDD carrier are used for downlink transmission, while other frequency resources can be used for uplink reception. That is, within the TDD carrier, part of the frequency resources in any downlink time slot or downlink symbol can be configured for uplink transmission of the UE, or used as flexible symbols for downlink / uplink transition.

[0144] To this end, the base station may send SBFD subband configuration information for full-duplex communication. That is, the base station may send configuration information for configuring a downlink subband in an uplink time slot or configuring an uplink subband in a downlink time slot. The SBFD subband configuration information may include frequency domain and time domain related information for configuring an uplink subband or a downlink subband. Alternatively, the subband configuration information may include frequency domain and time domain related information for configuring a guard band. Here, the frequency resource information may include continuous resource block allocation information, and the time resource information may include continuous SBFD symbol allocation information.

[0145] For SBFD subband configuration, time resource information for the uplink subband may be set based on reference subcarrier spacing (reference SCS) information and mode setting information. In this case, the time resource information may be set based on the reference subcarrier spacing (SCS) included in the TDD configuration information. That is, as described above, the reference subcarrier spacing (reference SCS) setting included in the TDD configuration information may be used as a reference SCS for setting the time resource for configuring the uplink subband.

[0146] In addition, the time resource information can be set based on the number of TDD modes and the period of the mode included in the TDD configuration information. That is, as described above, the settings of mode 1 and mode 2 included in the TDD configuration information can be used as mode setting information for setting time resources for configuring uplink subbands.

[0147] In this case, the SBFD symbol allocation information can be set using the SBFD symbols that are respectively continuous within the period of the TDD mode set to one or two. Each mode setting information may include period setting information, offset information, and interval information of the corresponding mode. At this time, the interval information can be set to the number of continuous SBFD symbols starting from the offset, or can be set to a combination of the number of continuous SBFD time slots and the number of continuous SBFD symbols. Alternatively, according to an example, the offset can be set to a cutoff point instead of a starting point. That is, the offset information corresponding to the cutoff point and the interval information starting from the cutoff point can also be set.

[0148] For SBFD subband configuration, the frequency resource setting information for the uplink subband can be set in units of common resource blocks (CRBs). In this case, the frequency resource setting for the uplink subband can be accompanied by the guard band setting or the downlink subband setting in the same symbol / time slot. That is, the frequency resource setting information for the uplink subband may include at least one of the frequency resource setting information for the guard band or the downlink subband accompanying in the SBFD time slot or SBFD symbol configuring the uplink subband. In this case, the time resource setting information for the guard band or the downlink subband can be set to follow the time resource setting information for the uplink subband.

[0149] According to an example, for SBFD subband configuration, the frequency resource information for the uplink subband may include setting information for one uplink subband and one or two guard bands based on CRB. At this time, when the uplink subband is located at the center of the frequency band, two guard bands may be configured above and below the uplink subband. On the contrary, when the uplink subband is located at the upper boundary of the frequency band, a guard band may be configured below the uplink subband. Alternatively, when the uplink subband is located at the lower boundary of the frequency band, a guard band may be configured above the uplink subband. Therefore, configuration information for one or two guard bands may be included in the frequency resource information. In this case, the downlink subband may be configured across the guard band, and the downlink subband may be inferred based on the frequency resource information for the uplink subband and the guard band.

[0150] According to another example, for SBFD subband configuration, the frequency resource information for the uplink subband may include setting information for one uplink subband and one or two downlink subbands based on CRB. At this time, when the uplink subband is located at the center of the frequency band, two downlink subbands can be configured above and below the uplink subband. On the contrary, when the uplink subband is located at the upper boundary of the frequency band, a downlink subband can be configured below the uplink subband. Alternatively, when the uplink subband is located at the lower boundary of the frequency band, a downlink subband can be configured above the uplink subband. Therefore, setting information for one or two downlink subbands can be included in the frequency resource information. In this case, a guard band can be configured between the uplink subband and the downlink subband, and the guard band can be inferred based on the frequency resource information for the uplink subband and the downlink subband.

[0151] According to an example, the SBFD subband configuration information may be sent through cell-specific high-layer signaling. That is, the base station may send the SBFD subband configuration information to the UE through cell-specific RRC signaling. The UE may receive the TDD configuration information and the SBFD subband configuration information to configure the format of each time slot.

[0152] When the base station sends configuration information for a sounding reference signal to the UE, the UE may determine the transmit power to send the sounding reference signal according to the configuration information. To this end, the base station may send at least one power control parameter set for the UE to determine the transmit power.

[0153] When a sounding reference signal is transmitted according to the configuration information for the sounding reference signal in a time slot (i) in an activated uplink bandwidth slice (b) of a carrier (f) of a serving cell (c) to which the UE is connected, the transmission power of the sounding reference signal may be determined according to the aforementioned mathematical formula 1. The power control parameter set may include a parameter or a parameter set for each of the parameters constituting mathematical formula 1. The description related to mathematical formula 1 is as shown in reference Figure 8 The above will be omitted here.

[0154] The above parameters may be configured differently depending on whether the type of symbol used to transmit the sounding reference signal is an SBFD symbol or a non-SBFD symbol. Therefore, the power control parameter set may include parameters or parameter sets for the case involving SBFD symbols and the case involving non-SBFD symbols, respectively.

[0155] Refer again Fig. 9 The base station may receive the sounding reference signal according to the transmission power of the sounding reference signal determined based on at least one power control parameter set (S920).

[0156] For the case where the symbol used to send the sounding reference signal is an SBFD symbol and the case where the symbol used to send the sounding reference signal is a non-SBFD symbol, the transmission power of the sounding reference signal can be determined separately. That is, the UE can determine the transmission power for sending the sounding reference signal differently according to the type of symbol allocated for sending the sounding reference signal. To this end, the UE can determine the transmission power by selecting a parameter depending on the type of symbol to be used to send the sounding reference signal from among the parameters for the case involving the SBFD symbol and the parameters for the case involving the non-SBFD symbol included in the power control parameter set.

[0157] According to an example, the transmission power of the sounding reference signal may be determined based on the maximum SRS transmission power parameters separately configured for the case involving the SBFD symbol and the case involving the non-SBFD symbol. That is, the base station may separately configure the maximum SRS transmission power parameter for each type of symbol used to transmit the sounding reference signal, and include it in one power control parameter set for transmission.

[0158] Therefore, when sending a sounding reference signal in a non-SBFD symbol, the UE can determine the transmit power by applying the maximum transmit power value parameter corresponding to the non-SBFD symbol. When sending a sounding reference signal in a SBFD symbol, the UE can determine the transmit power by applying the maximum transmit power value parameter corresponding to the SBFD symbol.

[0159] According to another example, the transmission power of the sounding reference signal may be determined based on at least one open-loop power control parameter separately configured for a case involving an SBFD symbol and a case involving a non-SBFD symbol. That is, the base station may separately configure at least one open-loop power control parameter for each type of symbol used to transmit the sounding reference signal, and include it in a power control parameter set for transmission.

[0160] As described above, the open loop power control parameters may include target received power parameters at the base station. In addition, the open loop power control parameters may include parameters for partial path loss compensation, which are obtained by adjusting the downlink path loss measured by a specific downlink reference signal by a specific ratio value.

[0161] Therefore, when the sounding reference signal is transmitted in a non-SBFD symbol, the UE can determine the transmission power by applying the open-loop power control parameters corresponding to the non-SBFD symbol. When the sounding reference signal is transmitted in the SBFD symbol, the UE can determine the transmission power by applying at least one of the open-loop power control parameters corresponding to the SBFD symbol. That is, at least one of the target received power parameter configured for the SBFD symbol and the specific ratio value can be applied.

[0162] In addition, the transmission power of the sounding reference signal can be determined based on the path loss measurement values ​​of the reference signals separately configured for the case involving SBFD symbols and the case involving non-SBFD symbols. That is, the reference signal as the object of measuring the path loss can be configured differently according to the type of symbol.

[0163] In this case, the reference signal may be transmitted through the same type of symbol as the symbol used to receive the sounding reference signal. For example, when the CSI-RS is used as a reference signal, if the symbol used to transmit the sounding reference signal is a non-SBFD symbol, the UE may measure the path loss only for the CSI-RS received through the non-SBFD symbol. If the symbol used to transmit the sounding reference signal is a SBFD symbol, the UE may measure the path loss only for the CSI-RS received through the SBFD symbol.

[0164] According to another example, the transmission power of the sounding reference signal may be determined based on closed-loop power control commands separately indicated for a case involving an SBFD symbol and a case involving a non-SBFD symbol. That is, the base station may configure at least one closed-loop power control command for each type of symbol used to transmit the sounding reference signal, and include it in a power control parameter set for transmission.

[0165] In this case, the closed-loop power control command may be indicated by a TPC command (transmit power control command) configured separately for a case involving an SBFD symbol and a case involving a non-SBFD symbol, or may be indicated by a TPC command including symbol type indication information. For example, the parameters determined by the TPC command may be used to determine the closed-loop power control related parameters of Mathematical Formula 1.

[0166] According to another example, the transmission power of the sounding reference signal can be determined based on the power offset value configured for the case involving SBFD symbols. That is, the base station can configure the power offset value when the symbol type used to send the sounding reference signal is a SBFD symbol, and include it in a power control parameter set for transmission.

[0167] Therefore, when the sounding reference signal is transmitted in a non-SBFD symbol, the UE can determine the transmit power without further applying the power offset value.When the sounding reference signal is transmitted in a SBFD symbol, the UE can determine the transmit power by applying the power offset value corresponding to the SBFD symbol.

[0168] For example, when a sounding reference signal is sent in an SBFD symbol, the UE may add or subtract a power offset value in Math 1. Alternatively, when a sounding reference signal is sent in an SBFD symbol, the UE may multiply the power offset value in Math 1. Alternatively, when a sounding reference signal is sent in an SBFD symbol, the UE may apply the power offset value to at least one of the parameters constituting Math 1. In this case, the power offset value may also be configured separately for each parameter constituting Math 1.

[0169] Hereinabove, examples in which each parameter constituting Mathematical Formula 1 is differently applied according to the type of symbol have been described, and these examples may be applied independently, or two or more examples may be applied in combination.

[0170] Thus, a method and apparatus capable of effectively adjusting the transmission power of a sounding reference signal in a time slot or symbol to which full-duplex communication is applied can be provided.

[0171] Hereinafter, with reference to relevant drawings, various embodiments related to a method for transmitting and receiving a sounding reference signal (SRS) in full-duplex communication will be described in detail.

[0172] The present disclosure proposes an uplink transmission power control method for supporting full-duplex communication in a wireless mobile communication system. Specifically, a method for controlling the transmission power of a sounding reference signal (ie, SRS) is proposed.

[0173] TDD (Time Division Duplex) is a duplex mode widely used in commercial NR (New Radio), i.e. 5G mobile communication systems. In TDD, time interval wireless resources are divided into downlink time slots and uplink time slots for use. Usually, the allocation ratio of downlink time slots is higher than that of uplink time slots according to the distribution ratio of uplink traffic and downlink traffic. However, this limitation of uplink time slots has a negative impact on coverage and latency. Full-duplex communication can be used as a technology to solve this problem.

[0174] Full-duplex communication is specifically a technology in which the gNB (i.e., base station) performs DL transmission and UL reception simultaneously on the same wireless resource. The UE side can also perform DL reception and UL transmission simultaneously. That is, both the base station and the UE can support full-duplex. However, unlike the base station, which is structurally easy to cancel self-interference, in the case of the UE, the DL reception performance is easily affected by the self-interference of the UL transmission signal. Therefore, it is usually considered that the base station operates as full-duplex communication and the UE operates as half-duplex communication. In addition, in order to reduce the impact of self-interference on the base station side, it can be preliminarily considered to adopt a sub-band non-overlapping full-duplex communication (in this disclosure, it can also be referred to as SBFD or sub-band full-duplex) mode when performing DL transmission and UL reception at the same time, in which transmission and reception are performed on different frequency resources respectively, instead of using the same resources between DL / UL.

[0175] Right now, Fig.10 and Fig.11 An example of configuring DL time slots and UL time slots at a ratio of 4:1 in any NR frequency band is shown. However, some symbols of the last DL time slot may be special time slots including flexible symbols for DL / UL conversion. In this way, when a time division duplex (TDD) configuration is implemented, an uplink subband (UL subband) supporting UL transmission of a UE may be set in some (or all) of the corresponding DL time slots. When a UL subband is set in any DL time slot, as shown in FIG. Fig.10 The UL subband is set at the center of the frequency band as shown, or as Fig.11 In this case, a guard band may be set between the UL subband and the downlink subband (DL subband) in the time slot.

[0176] In the present disclosure, when any base station / network supports sub-band non-overlapping full-duplex, a method for setting BWP accordingly and the base station and UE to transmit and receive uplink and downlink wireless signals (DM-RS, CSI-RS, SRS, PSS / SSS, etc.) and wireless channels (such as PDCCH / PDSCH and PUSCH / PUCCH, etc.) accordingly is proposed. However, the content described in the present disclosure can be applied to various other full-duplex application scenarios in a substantially identical manner. For example, a full-duplex application scenario may include full-duplex operation in an unpaired spectrum and full-duplex operation in a downlink (DL) band or uplink (UL) band of a paired spectrum. In addition, as described above, the content of the present disclosure can also be applied substantially identically to a scenario in which sub-band non-overlapping full-duplex or pure full-duplex (i.e., DL transmission and UL reception are performed simultaneously on the same frequency resource) is supported only on the base station side, and half-duplex operation is performed on the UE. In addition, even when both the base station and the UE support sub-band non-overlapping full-duplex or pure full-duplex, the content of the present disclosure can also be applied substantially identically.

[0177] The uplink-downlink (UL-DL) time slot setting defined in NR is defined to be completed on a cell-by-cell basis through cell-specific RRC signaling. That is, the pattern of DL symbols, UL symbols, and flexible symbols of a specific period is set through the RRC message "tdd-UL-DL-ConfigurationCommon" for the corresponding UL-DL time slot configuration. In addition, through the UE-specific RRC signaling "tdd-UL-DL-ConfigurationDedicated", only the flexible symbols set by "tdd-UL-DL-ConfigurationCommon" are reallocated as UL symbols, DL symbols, or flexible symbols for each UE. Alternatively, a method for indicating a dynamic time slot format through a UE group common PDCCH is also defined. To this end, NR also supports a method for indicating a dynamic time slot format through DCI format 2_0.

[0178] According to the above-mentioned time slot configuration method, any symbol can be set or indicated as one of DL, UL or Flexible. Fig.10It is an example of setting any time slot format to DDDSU through the existing time slot configuration. D represents a downlink time slot and all OFDM symbols constituting the time slot are set to DL. U represents an uplink time slot and all OFDM symbols constituting the time slot are set to UL. S represents a special time slot, that is, a time slot containing flexible symbols for DL / UL conversion. Typically, in the case of a normal CP, a total of 14 symbols of a special time slot can consist of 12 DL and 2 flexible symbols. Alternatively, it can consist of 10 DL symbols, 2 flexible symbols, and 2 UL symbols. That is, within any TDD carrier, a symbol is set or indicated as only one of DL, UL or flexible.

[0179] However, when Fig.10 and Fig.11 When a UL subband is configured in any DL time slot, DL transmission or UL transmission can occur simultaneously in the corresponding symbol according to the frequency resource. Thus, in the present disclosure, a DL time slot or symbol including a UL subband, or a UL time slot or symbol including a DL subband is referred to as a subband full duplex (SBFD) time slot or SBFD symbol.

[0180] In addition, in the present disclosure, a time slot consisting only of SBFD symbols is referred to as a SBFD time slot, and a time slot consisting only of symbols based on an existing symbol setting (i.e., a time slot consisting only of symbols excluding a UL subband, a DL subband, and a guard band) is referred to as a non-SBFD time slot. Alternatively, a time slot including at least one SBFD symbol may also be referred to as a SBFD time slot.

[0181] Next, when the UE transmits the SRS in a SBFD slot or a SBFD symbol, a method for controlling SRS transmission power in the UE is proposed.

[0182] When any base station supports subband non-overlapping full-duplex, SRS transmission can be performed through the corresponding UL subband in the SBFD symbol or SBFD time slot configured with the UL subband as described above. That is, SRS transmission resources through the SBFD symbol or SBFD time slot including the UL subband can be set for any UE supporting SBFD operation in any cell / base station / network and the corresponding SRS transmission can be indicated. SRS transmission through the SBFD symbol can include periodic SRS transmission based on periodic SRS transmission resource configuration and aperiodic SRS transmission based on SRS transmission indication through DCI after aperiodic SRS transmission resources are configured.

[0183] In this way, the base station can configure / indicate the SRS transmission of the UE through the UL subband of the SBFD symbol. At this time, the uplink and downlink wireless channel environment between the UE and the base station in the SBFD symbol may be different from the uplink and downlink wireless channel environment between the UE and the base station in the existing non-SBFD symbol. Specifically, in the SBFD symbol, since downlink transmission and uplink reception can occur simultaneously at the base station, the transceiver antenna and the RF module of the base station need to be divided into transmission and reception for operation. In addition, additional wireless signal interference may occur in the SBFD symbol, such as self-interference or cross-link interference. Therefore, the uplink wireless channel state from any UE to the base station may also differ between the SBFD symbol and the non-SBFD symbol.

[0184] Taking this into consideration, the present disclosure proposes to define an SRS transmission power adjustment formula through SBFD symbols in any UE independently from the SRS transmission power adjustment formula through existing non-SBFD symbols. That is, if a UL subband (or DL ​​subband) for SBFD operation is configured for any SBFD-aware UE supporting SBFD in any cell / carrier, when the UE transmits SRS in the cell / carrier, a separate SRS transmission power adjustment formula can be applied to set the SRS transmission power between the SRS transmission in the non-SBFD symbols and the SRS transmission in the SBFD symbols. That is, the SRS transmission power adjustment formula through SBFD symbols is defined independently of the SRS transmission power adjustment formula through existing UL symbols. Therefore, when the UE performs any SRS transmission through non-SBFD symbols, it determines the SRS transmission power based on the following existing SRS transmission power adjustment formula. In addition, when any SRS transmission is performed through SBFD symbols, it determines the SRS transmission power based on the new SRS transmission power adjustment formula.

[0185] According to the existing NR SRS transmission power control method, when any UE transmits SRS configured according to any SRS-ResourceSet (resource set) through the time slot (i) in the activated UL BWP (b) of the carrier (f) of any serving cell (c), the corresponding SRS transmission power is determined based on the following mathematical formula 2.

[0186] [Mathematical formula 2]

[0187]

[0188] In the above formula, the first row It is the maximum transmission power value defined for SRS transmission on the corresponding frequency carrier.

[0189] In the above formula, the transmission power adjustment formula in the second row is respectively composed of parameters related to open-loop power control, parameters related to closed-loop power control, and parameters related to SRS transmission resource allocation (ie, SRS transmission bandwidth).

[0190] Refers to the target received power of the base station. can be regarded as a parameter for partial path loss compensation and can be regarded as a parameter that will be used with a specific downlink reference signal q d The downlink path loss value obtained by reference measurement is divided into a certain ratio of α Adjust the obtained value. These two parameters can be regarded as parameters related to open-loop power control.

[0191] On the other hand, h b，f，c (i, l) = f b，f，c (i, l), where f b，f，c (i, l) is a PUSCH transmission power adjustment state value, which can be regarded as a closed-loop power control parameter adjusted according to the TPC command (transmission power control command) value indicated by the base station.

[0192] In addition, MSRS b，f，c (i) is the power adjustment value based on the SRS bandwidth.

[0193] Example 1

[0194] The maximum transmit power value for SRS transmission in SBFD symbols can be defined and set separately That is, for any UE, it is possible to use the above-mentioned SBFD symbols in any carrier independently. The value is defined for the SBFD symbol Therefore, for any SRS transmission, if the SRS transmission is an SRS transmission through a non-SBFD symbol as in the existing one, the UE may use the SRS for the existing non-SBFD symbol The value is applied to the above SRS transmission power adjustment formula to determine the SRS transmission power, and if any SRS transmission is an SRS transmission through a new SBFD symbol, an additional SRS transmission power adjustment for the SBFD symbol can be applied.

[0195] Example 2

[0196] A separate open-loop power control parameter or parameter set for SRS transmission via SBFD symbols may be defined and set separately by the base station. That is, the base station may define the above-mentioned parameters set corresponding to any SRS-ResourceSet or SRS-ResourceSetID. and / or Further set up a separate SRS transmission in SFBD symbol and / or

[0197] For example, when setting the parameters for open-loop power control for SRS transmission, the base station may simultaneously set the existing and / or and separate open-loop power control parameters for SBFD symbols and / or That is, any UE can be allocated by the base station by being independent of the existing and / or Value for SBFD symbol and / or Therefore, any UE may apply a separate open-loop power control and / or path loss compensation parameter or parameter set when performing any SRS transmission via SBFD symbols. and / or

[0198] Alternatively, for the downlink reference signal used for path loss measurement for the above-mentioned path loss compensation, it can be defined that the path loss is measured based on separate reference signals in SBFD symbols and non-SBFD symbols. For example, as a reference signal used to derive the corresponding path loss measurement value PL b，f，c (q d ), a reference signal for use in non-SBFD symbols and a reference signal for use in SBFD symbols may be defined separately. For example, when it is set to measure path loss based on CSI-RS for any UE, for the above PL for adjusting the SRS transmit power through non-SBFD symbols b，f，c (q d ) value, it can be defined as measuring the corresponding path loss value only for the CSI-RS transmitted through non-SBFD symbols. On the other hand, for the above-mentioned PL for adjusting the SRS transmission power through SBFD symbols b，f，c (q d ) value can be defined as measuring the corresponding path loss value only for the CSI-RS sent through the SBFD symbol.

[0199] Example 3

[0200] In the components constituting the formula corresponding to the second row of the above-mentioned transmission power adjustment formula, closed-loop power control related processes can be defined separately for SBFD symbols and non-SBFD symbols. That is, when any UE sets the SBFD operation, it can be defined that the UE further performs a power adjustment process based on the TPC command for SRS transmission through the SBFD symbol, which is independent of the power adjustment process based on the TPC command for SRS transmission through the existing non-SBFD symbol. That is, the base station distinguishes the h used to determine the SRS transmission power adjustment in the existing non-SBFD symbol. b，f，c (i, l) = f b，f，c (i, l) and h for determining the SRS transmit power adjustment in the SBFD symbol b，f，c (i, l) = f b，f，c The TPC commands of (i, l) are respectively indicated to the UE. That is, the DCI format containing the TPC command for any SRS transmission can include an information field for distinguishing whether the TPC command is a TPC command for adjusting the SRS transmission power in the existing non-SBFD symbol or a TPC command for adjusting the SRS transmission power in the SBFD symbol, or a separate DCI format for the TPC command in the SBFD symbol can be defined and configured so that the UE monitors it.

[0201] For example, when the SRS TPC command is indicated by DCI format 2_2 or DCI format 2_3, which is a UE group common DCI format for an existing TPC command, an information field for indicating whether the corresponding TPC command is used for SRS transmission in a non-SBFD symbol or for SRS transmission in a SBFD symbol may be further included in the DCI format. As another method, a new DCI format 2_x1 or 2_x2 may be further defined to indicate a TPC command for SRS transmission in a new SBFD symbol independently of the existing DCI format 2_2 or 2_3 for indicating a TPC command for an existing non-SBFD symbol, and the UE may be configured to monitor it.

[0202] In addition, as shown below, the SRS transmit power adjustment table (Table 3) based on the TPC command in the SBFD symbol can be defined independently of the SRS transmit power adjustment table (Table 2) based on the TPC command in the existing non-SBFD symbol, so that the SRS transmit power adjustment value based on the TPC command field setting value applies different values ​​to the non-SBFD symbol and the SBFD symbol. The following Table 2 is a mapping table based on the TPC field for ordinary symbols (non-SBFD symbols), and Table 3 is a mapping table based on a separate TPC field for SBFD symbols. X1, Y1, Z1, W1 and X2, Y2, Z2, W2 in Table 3 can be any number and can be composed of numbers different from the corresponding numbers in Table 2.

[0203] [Table 2]

[0204] TPC Command Field <![CDATA[Accumulated δ PUSCH，b，f，c or δ SRS，b，f，c [dB]]]> <![CDATA[Absolute δ PUSCH，b，f，c or δ SRS，b，f，c [dB]]]> 0 -1 -4 1 0 -1 2 1 1 3 3 4

[0205] [Table 3]

[0206] TPC Command Field <![CDATA[Accumulated δ PUSCH，b，f，c or δ SRS，b，f，c[dB] > <![CDATA[Absolute δ PUSCH，b，f，c or δ SRS，b，f，c [dB]]]> 0 X1 X2 1 Y1 Y2 2 Z1 Z2 3 W1 W2

[0207] Example 4

[0208] A separate power offset for SRS transmission in SBFD symbols may be defined and defined to be included in the SRS transmission power adjustment formula. For example, a power offset value Δ for SRS transmission power in SBFD symbols compared to SRS transmission power adjustment in non-SBFD symbols may be defined as SBFD , and is defined as including it in the above SRS transmit power adjustment formula. For example, the SRS transmit power adjustment formula in the SBFD symbol can include the power offset value Δ in a plus (or minus) manner as shown in Mathematical Formula 3. SBFD , or as shown in Mathematical Formula 4, including the power offset value Δ by multiplying by a specific ratio SBFD .

[0209] [Mathematical formula 3]

[0210]

[0211] [Formula 4]

[0212]

[0213] Alternatively, Δ may be included by adding (or subtracting) or multiplying by a specific ratio for only certain of the two inputs to the min function. SBFD For example, the transmission power adjustment formula corresponding to the second row of the above formula may include Δ in a manner of adding (or subtracting) or multiplying by a specific ratio. SBFDThe power offset value Δ of the SRS transmission power in the SBFD symbol compared with the SRS transmission power adjustment in the non-SBFD symbol SBFD It may be set by the base station through UE-specific or cell-specific higher layer signaling, or may be defined as an arbitrary fixed value.

[0214] All of the above examples are described based on symbols or time slots on the time axis, but the contents can be basically the same applied to various time resource units such as subframes and frames.

[0215] Regarding the above-described embodiments, the scope of the invention according to the present disclosure includes not only each embodiment independently but also all examples consisting of combinations of the embodiments.

[0216] Hereinafter, a method capable of performing reference will be described with reference to the accompanying drawings. Figures 1 to 11 Configurations of some or all of the UEs and base stations in the described embodiments. The foregoing description may be omitted to avoid repeated description, and in this case, the omitted content may be substantially the same as applied to the following description as long as it does not conflict with the technical concept of the present invention.

[0217] Fig.12 is a diagram showing a configuration of a UE 1200 according to still another embodiment.

[0218] Reference Fig.12 According to yet another embodiment, a UE 1200 includes a transmitting unit 1220, a receiving unit 1230, and a control unit 1210 for controlling operations of the transmitting unit and the receiving unit.

[0219] The control unit 1210 controls the overall operation of the UE 1200 according to the method for transmitting and receiving a sounding reference signal in full-duplex communication required to perform the aforementioned present invention.

[0220] The control unit 1210 may receive information related to the configuration of SBFD symbols or time slots from the base station and configure the time slot format accordingly. Figure 8 Description has been made, so further description will be omitted here.

[0221] The control unit 1210 may receive at least one power control parameter set for determining the transmit power of the sounding reference signal from the base station. When the control unit 1210 receives configuration information for the sounding reference signal from the base station, the control unit 1210 may determine the transmit power to transmit the sounding reference signal according to the configuration information. To this end, the control unit 1210 may use at least one power control parameter set received from the base station.

[0222] When a sounding reference signal is transmitted according to the configuration information for the sounding reference signal in a time slot (i) in an activated uplink bandwidth slice (b) of a carrier (f) of a serving cell (c) to which the UE is connected, the transmission power of the sounding reference signal may be determined according to the aforementioned mathematical formula 1. The power control parameter set may include a parameter or a parameter set for each of the parameters constituting mathematical formula 1. The description related to mathematical formula 1 is as shown in reference Figure 8 The above will be omitted here.

[0223] The above parameters may be configured differently depending on whether the type of symbol used to transmit the sounding reference signal is an SBFD symbol or a non-SBFD symbol. Therefore, the power control parameter set may include parameters or parameter sets for the case involving SBFD symbols and the case involving non-SBFD symbols, respectively.

[0224] The control unit 1210 may determine the transmit power of the sounding reference signal based on at least one power control parameter set, and transmit the sounding reference signal according to the determined transmit power.

[0225] For the case where the symbol used to send the sounding reference signal is an SBFD symbol and the case where the symbol used to send the sounding reference signal is a non-SBFD symbol, the transmission power of the sounding reference signal can be determined separately. That is, the control unit 1210 can determine the transmission power for sending the sounding reference signal differently according to the type of symbol allocated for sending the sounding reference signal. To this end, the control unit 1210 can determine the transmission power by selecting a parameter depending on the type of symbol to be used to send the sounding reference signal from among the parameters for the case involving the SBFD symbol and the parameters for the case involving the non-SBFD symbol included in the power control parameter set.

[0226] According to an example, the transmission power of the sounding reference signal may be determined based on the maximum SRS transmission power parameters separately configured for the case involving the SBFD symbol and the case involving the non-SBFD symbol. That is, the maximum SRS transmission power parameter may be separately configured for each type of symbol used to transmit the sounding reference signal and included in one power control parameter set.

[0227] Therefore, when the sounding reference signal is transmitted in a non-SBFD symbol, the control unit 1210 can determine the transmit power by applying the maximum transmit power value parameter corresponding to the non-SBFD symbol. When the sounding reference signal is transmitted in a SBFD symbol, the control unit 1210 can determine the transmit power by applying the maximum transmit power value parameter corresponding to the SBFD symbol.

[0228] According to another example, the transmission power of the sounding reference signal may be determined based on at least one open-loop power control parameter separately configured for a case involving an SBFD symbol and a case involving a non-SBFD symbol. That is, at least one open-loop power control parameter may be separately configured for each type of symbol used to transmit the sounding reference signal and included in one power control parameter set.

[0229] As described above, the open loop power control parameters may include target received power parameters at the base station. In addition, the open loop power control parameters may include parameters for partial path loss compensation, which are obtained by adjusting the downlink path loss measured by a specific downlink reference signal by a specific ratio value.

[0230] Therefore, when the sounding reference signal is transmitted in a non-SBFD symbol, the control unit 1210 can determine the transmission power by applying the open-loop power control parameter corresponding to the non-SBFD symbol. When the sounding reference signal is transmitted in the SBFD symbol, the control unit 1210 can determine the transmission power by applying at least one of the open-loop power control parameters corresponding to the SBFD symbol. That is, at least one of the target received power parameter configured for the SBFD symbol and the specific ratio value can be applied.

[0231] In addition, the transmission power of the sounding reference signal can be determined based on the path loss measurement values ​​of the reference signals separately configured for the case involving SBFD symbols and the case involving non-SBFD symbols. That is, the reference signal as the object of measuring the path loss can be configured differently according to the type of symbol.

[0232] In this case, the reference signal may be received through a symbol of the same type as the symbol used to transmit the sounding reference signal. For example, when the CSI-RS is used as a reference signal, if the symbol used to transmit the sounding reference signal is a non-SBFD symbol, the control unit 1210 may measure the path loss only for the CSI-RS received through the non-SBFD symbol. If the symbol used to transmit the sounding reference signal is a SBFD symbol, the control unit 1210 may measure the path loss only for the CSI-RS received through the SBFD symbol.

[0233] According to another example, the transmission power of the sounding reference signal may be determined based on closed-loop power control commands separately indicated for a case involving an SBFD symbol and a case involving a non-SBFD symbol. That is, at least one closed-loop power control command may be configured for each type of symbol used to transmit the sounding reference signal and included in one power control parameter set.

[0234] In this case, the closed-loop power control command may be indicated by a TPC command (transmit power control command) configured separately for a case involving an SBFD symbol and a case involving a non-SBFD symbol, or may be indicated by a TPC command including symbol type indication information. For example, the parameters determined by the TPC command may be used to determine the closed-loop power control related parameters of Mathematical Formula 1.

[0235] According to another example, the transmission power of the sounding reference signal can be determined based on the power offset value configured for the case involving SBFD symbols. That is, the power offset value can be configured when the symbol type used to transmit the sounding reference signal is a SBFD symbol and included in a power control parameter set.

[0236] Therefore, when transmitting the sounding reference signal in a non-SBFD symbol, the control unit 1210 can determine the transmit power without further applying the power offset value. When transmitting the sounding reference signal in a SBFD symbol, the control unit 1210 can determine the transmit power by applying the power offset value corresponding to the SBFD symbol.

[0237] For example, when the sounding reference signal is transmitted in the SBFD symbol, the control unit 1210 may add or subtract the power offset value in Math 1. Alternatively, when the sounding reference signal is transmitted in the SBFD symbol, the control unit 1210 may multiply the power offset value in Math 1. Alternatively, when the sounding reference signal is transmitted in the SBFD symbol, the control unit 1210 may apply the power offset value to at least one of the parameters constituting Math 1. In this case, the power offset value may also be configured separately for each parameter constituting Math 1.

[0238] Hereinabove, examples in which each parameter constituting Mathematical Formula 1 is differently applied according to the type of symbol have been described, and these examples may be applied independently, or two or more examples may be applied in combination.

[0239] Thus, a method and apparatus capable of effectively adjusting the transmission power of a sounding reference signal in a time slot or symbol to which full-duplex communication is applied can be provided.

[0240] Fig.13 is a diagram showing a structure of a base station 1300 according to still another embodiment.

[0241] Reference Fig.13 According to yet another embodiment, a base station 1300 includes a transmitting unit 1320, a receiving unit 1330, and a control unit 1310 for controlling operations of the transmitting unit and the receiving unit.

[0242] The control unit 1310 controls the overall operation of the base station 1300 according to the method for transmitting and receiving a sounding reference signal in full-duplex communication required for performing the aforementioned present invention. The transmitting unit 1320 transmits downlink control information, data, and messages to the UE through the corresponding channel. The receiving unit 1330 receives uplink control information, data, messages, etc. from the UE through the corresponding channel.

[0243] The control unit 1310 may send information related to the configuration of the SBFD symbol or time slot to the UE. In this case, the UE may use the corresponding information to configure the time slot format. Fig. 9 Description has been made, so further description will be omitted here.

[0244] The control unit 1310 may send at least one power control parameter set for determining the transmit power of the sounding reference signal to the UE. When the control unit 1310 sends configuration information for the sounding reference signal to the UE, the UE may determine the transmit power to send the sounding reference signal according to the configuration information. To this end, the control unit 1310 may send at least one power control parameter set for the UE to determine the transmit power.

[0245] When a sounding reference signal is transmitted according to the configuration information for the sounding reference signal in a time slot (i) in an activated uplink bandwidth slice (b) of a carrier (f) of a serving cell (c) to which the UE is connected, the transmission power of the sounding reference signal may be determined according to the aforementioned mathematical formula 1. The power control parameter set may include a parameter or a parameter set for each of the parameters constituting mathematical formula 1. The description related to mathematical formula 1 is as shown in reference Figure 8 The above will be omitted here.

[0246] The above parameters may be configured differently depending on whether the type of symbol used to transmit the sounding reference signal is an SBFD symbol or a non-SBFD symbol. Therefore, the power control parameter set may include parameters or parameter sets for the case involving SBFD symbols and the case involving non-SBFD symbols, respectively.

[0247] The control unit 1310 may receive the sounding reference signal according to the transmission power of the sounding reference signal determined based on at least one power control parameter set.

[0248] The transmission power of the sounding reference signal may be determined separately for the case where the symbol used to transmit the sounding reference signal is an SBFD symbol and the case where the symbol used to transmit the sounding reference signal is a non-SBFD symbol. That is, the UE may determine the transmission power used to transmit the sounding reference signal differently according to the type of symbol allocated for transmitting the sounding reference signal. To this end, the UE may determine the transmission power by selecting a parameter depending on the type of symbol to be used to transmit the sounding reference signal from among the parameters for the case involving the SBFD symbol and the parameters for the case involving the non-SBFD symbol included in the power control parameter set.

[0249] According to an example, the transmission power of the sounding reference signal may be determined based on the maximum SRS transmission power parameters separately configured for the case involving the SBFD symbol and the case involving the non-SBFD symbol. That is, the control unit 1310 may configure the maximum SRS transmission power parameter for each type of symbol used to transmit the sounding reference signal, and include it in one power control parameter set for transmission.

[0250] Therefore, when sending a sounding reference signal in a non-SBFD symbol, the UE can determine the transmit power by applying the maximum transmit power value parameter corresponding to the non-SBFD symbol. When sending a sounding reference signal in a SBFD symbol, the UE can determine the transmit power by applying the maximum transmit power value parameter corresponding to the SBFD symbol.

[0251] According to another example, the transmission power of the sounding reference signal may be determined based on at least one open-loop power control parameter separately configured for a case involving an SBFD symbol and a case involving a non-SBFD symbol. That is, the control unit 1310 may configure at least one open-loop power control parameter for each type of symbol used to transmit the sounding reference signal, and include it in a power control parameter set for transmission.

[0252] As described above, the open loop power control parameters may include target received power parameters at the base station. In addition, the open loop power control parameters may include parameters for partial path loss compensation, which are obtained by adjusting the downlink path loss measured by a specific downlink reference signal by a specific ratio value.

[0253] Therefore, when the sounding reference signal is transmitted in a non-SBFD symbol, the UE can determine the transmission power by applying the open-loop power control parameters corresponding to the non-SBFD symbol. When the sounding reference signal is transmitted in the SBFD symbol, the UE can determine the transmission power by applying at least one of the open-loop power control parameters corresponding to the SBFD symbol. That is, at least one of the target received power parameter configured for the SBFD symbol and the specific ratio value can be applied.

[0254] In addition, the transmission power of the sounding reference signal can be determined based on the path loss measurement values ​​of the reference signals separately configured for the case involving SBFD symbols and the case involving non-SBFD symbols. That is, the reference signal as the object of measuring the path loss can be configured differently according to the type of symbol.

[0255] In this case, the reference signal may be transmitted through the same type of symbol as the symbol used to receive the sounding reference signal. For example, when the CSI-RS is used as a reference signal, if the symbol used to transmit the sounding reference signal is a non-SBFD symbol, the UE may measure the path loss only for the CSI-RS received through the non-SBFD symbol. If the symbol used to transmit the sounding reference signal is a SBFD symbol, the UE may measure the path loss only for the CSI-RS received through the SBFD symbol.

[0256] According to another example, the transmission power of the sounding reference signal may be determined based on the closed-loop power control commands separately indicated for the case involving the SBFD symbol and the case involving the non-SBFD symbol. That is, the control unit 1310 may configure at least one closed-loop power control command for each type of symbol used to transmit the sounding reference signal, and include it in a power control parameter set for transmission.

[0257] In this case, the closed-loop power control command may be indicated by a TPC command (transmit power control command) configured separately for a case involving an SBFD symbol and a case involving a non-SBFD symbol, or may be indicated by a TPC command including symbol type indication information. For example, the parameters determined by the TPC command may be used to determine the closed-loop power control related parameters of Mathematical Formula 1.

[0258] According to another example, the transmission power of the sounding reference signal can be determined based on the power offset value configured for the case involving SBFD symbols. That is, the control unit 1310 can configure the power offset value when the symbol type used to transmit the sounding reference signal is a SBFD symbol, and include it in a power control parameter set for transmission.

[0259] Therefore, when the sounding reference signal is transmitted in a non-SBFD symbol, the UE can determine the transmit power without further applying the power offset value.When the sounding reference signal is transmitted in a SBFD symbol, the UE can determine the transmit power by applying the power offset value corresponding to the SBFD symbol.

[0260] For example, when a sounding reference signal is sent in an SBFD symbol, the UE may add or subtract a power offset value in Math 1. Alternatively, when a sounding reference signal is sent in an SBFD symbol, the UE may multiply the power offset value in Math 1. Alternatively, when a sounding reference signal is sent in an SBFD symbol, the UE may apply the power offset value to at least one of the parameters constituting Math 1. In this case, the power offset value may also be configured separately for each parameter constituting Math 1.

[0261] Hereinabove, examples in which each parameter constituting Mathematical Formula 1 is differently applied according to the type of symbol have been described, and these examples may be applied independently, or two or more examples may be applied in combination.

[0262] Thus, a method and apparatus capable of effectively adjusting the transmission power of a sounding reference signal in a time slot or symbol to which full-duplex communication is applied can be provided.

[0263] The above embodiments may be supported by standard documents disclosed in at least one of the wireless access systems such as IEEE802, 3GPP and 3GPP2. That is, the steps, configurations and parts not described in the present embodiment may be supported by the above standard documents to clarify the technical concept of the present disclosure. In addition, all terms disclosed herein may be interpreted by the above public standard documents.

[0264] The above-mentioned embodiment can be implemented by various means. For example, the present embodiment can be implemented as hardware, firmware, software or a combination thereof.

[0265] In the case of hardware implementation, the method according to this embodiment can be implemented as an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microcontroller or a microprocessor, etc.

[0266] In the case of implementation by firmware or software, the method according to the present embodiment can be implemented in the form of a device, process or function for performing the above-mentioned functions or operations. The software code can be stored in a memory unit and can be driven by a processor. The memory unit can be arranged inside or outside the processor and can exchange data with the processor by any of various well-known means.

[0267] In addition, the terms "system", "processor", "controller", "component", "module", "interface", "model", "unit", etc. can generally refer to computer-related physical hardware, a combination of hardware and software, software, or running software. For example, the above-mentioned components can be, but are not limited to, processes driven by a processor, processors, controllers, control processors, entities, execution threads, programs, and / or computers. For example, an application running in a controller or processor and the controller or processor can both be components. One or more components can be provided in a process and / or execution thread, and these components can be located in a single device (e.g., a system, a computing device, etc.), or can be distributed on two or more devices.

[0268] The above embodiments of the present disclosure are described only for exemplary purposes, and those skilled in the art will appreciate that various modifications and variations may be made thereto without departing from the scope and spirit of the present disclosure. In addition, the embodiments of the present disclosure are not intended to limit but to illustrate the technical concept of the present disclosure, and therefore the scope of the technical concept of the present disclosure is not limited to these embodiments. The scope of the present disclosure should be interpreted based on the attached claims, so that all technical concepts included in the scope equivalent thereto belong to the present disclosure.

Claims

1. A method for a user equipment to send a sounding reference signal (SRS) in full duplex communication, comprising: receiving, from a base station, at least one set of power control parameters for determining a transmit power of a sounding reference signal; determining a transmit power of the sounding reference signal based on the at least one power control parameter set; as well as sending the sounding reference signal according to the determined transmit power, The transmission power of the sounding reference signal is determined separately for the case where the symbol used to send the sounding reference signal is a SBFD (Sub-Band Full Duplex) symbol and the case where the symbol is a non-SBFD symbol. 2 . The method according to claim 1 , wherein the transmit power of the sounding reference signal is determined based on maximum SRS transmit power parameters configured separately for a case involving the SBFD symbol and a case involving the non-SBFD symbol, respectively. 3 . The method according to claim 1 , wherein the transmit power of the sounding reference signal is determined based on at least one open-loop power control parameter configured separately for a case involving the SBFD symbol and a case involving the non-SBFD symbol. 4 . The method according to claim 1 , wherein the transmission power of the sounding reference signal is determined based on path loss measurement values ​​of reference signals separately configured for a case involving the SBFD symbol and a case involving the non-SBFD symbol. The method according to claim 4 , wherein the reference signal is received by a symbol of the same type as a symbol used to transmit the sounding reference signal. 6 . The method according to claim 1 , wherein the transmission power of the sounding reference signal is determined based on closed-loop power control commands separately indicated for a case involving the SBFD symbol and a case involving the non-SBFD symbol, respectively.

7. The method according to claim 6, wherein the closed-loop power control command is indicated by a TPC command (transmit power control command) configured separately for the case involving the SBFD symbol and the case involving the non-SBFD symbol, or is indicated by a TPC command including symbol type indication information.

8. The method according to claim 1, wherein the transmission power of the sounding reference signal is determined based on a power offset value configured for a case involving the SBFD symbol.

9. A method for a base station to receive a sounding reference signal (SRS) in full duplex communication, comprising: Sending at least one power control parameter set for determining a transmit power of a sounding reference signal to a user equipment; as well as receiving the sounding reference signal according to the transmit power of the sounding reference signal determined based on the at least one power control parameter set, The transmission power of the sounding reference signal is determined separately for a case where the symbol used to receive the sounding reference signal is a SBFD (Sub-Band Full Duplex) symbol and a case where the symbol is a non-SBFD symbol. 10 . The method according to claim 9 , wherein the transmission power of the sounding reference signal is determined based on a maximum SRS transmission power parameter configured separately for a case involving the SBFD symbol and a case involving the non-SBFD symbol. 11 . The method according to claim 9 , wherein the transmission power of the sounding reference signal is determined based on at least one open-loop power control parameter configured separately for a case involving the SBFD symbol and a case involving the non-SBFD symbol. 12 . The method according to claim 9 , wherein the transmission power of the sounding reference signal is determined based on path loss measurement values ​​of reference signals separately configured for a case involving the SBFD symbol and a case involving the non-SBFD symbol.

13. The method of claim 12, wherein the reference signal is transmitted by a symbol of the same type as a symbol used to receive the sounding reference signal.

14. The method according to claim 9, wherein the transmission power of the sounding reference signal is determined based on closed-loop power control commands separately indicated for a case involving the SBFD symbol and a case involving the non-SBFD symbol.

15. The method according to claim 14, wherein the closed-loop power control command is indicated by a TPC command (transmit power control command) configured separately for the case involving the SBFD symbol and the case involving the non-SBFD symbol, or the closed-loop power control command is indicated by a TPC command including symbol type indication information.

16. The method according to claim 9, wherein the transmission power of the sounding reference signal is determined based on a power offset value configured for a case involving the SBFD symbol.

17. A user equipment, configured to send a sounding reference signal (SRS) in full duplex communication, the user equipment comprising: Sending unit; Receiving unit; as well as A control unit for controlling the operations of the transmitting unit and the receiving unit, the control unit being configured to: receiving, from a base station, at least one set of power control parameters for determining a transmit power of a sounding reference signal; determining a transmit power of the sounding reference signal based on the at least one power control parameter set; and sending the sounding reference signal according to the determined transmit power, The transmission power of the sounding reference signal is determined separately for the cases where the symbol used to send the sounding reference signal is a SBFD (Sub-Band Full Duplex) symbol and a non-SBFD symbol.

18. The user equipment according to claim 17, wherein the transmission power of the sounding reference signal is determined based on maximum SRS transmission power parameters configured separately for a case involving the SBFD symbol and a case involving the non-SBFD symbol, respectively.

19. The user equipment according to claim 17, wherein the transmission power of the sounding reference signal is determined based on at least one open-loop power control parameter separately configured for a case involving the SBFD symbol and a case involving the non-SBFD symbol.

20. The user equipment according to claim 17, wherein the transmission power of the sounding reference signal is determined based on path loss measurement values ​​of reference signals separately configured for a case involving the SBFD symbol and a case involving the non-SBFD symbol.

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