Method and apparatus for transmitting uplink channels in a wireless communication system

Abstract

The disclosure relates to converging a 5G communication system for supporting a higher data rate beyond a 4G system with a technology for IoT, and can be applied to smart services based on 5G communication technology and IoT-related technology. The disclosure provides a method performed by a terminal in a communication system, including receiving, from a base station, configuration information for PUSCH repetition, identifying a configured time domain window for the PUSCH repetition based on the configuration information, and performing one or more repetitions of PUSCH transmission with the base station in the configured time domain window, wherein power consistency and phase continuity of the PUSCH transmission are maintained in the one or more repetitions, and wherein one or more TPC commands accumulated in the configured time domain window are applied after the configured time domain window.

Description

Technical Field

[0001] This disclosure generally relates to user equipment (UE) and base stations in wireless communication systems, and more specifically, to a method for a UE to transmit an uplink channel in a wireless communication system. Background Technology

[0002] To meet the increased demand for wireless data traffic since the deployment of fourth-generation (4G) communication systems, efforts have been made to develop improved fifth-generation (5G) or near-5G communication systems. Therefore, 5G or near-5G communication systems are also referred to as super-4G networks or post-Long Term Evolution (LTE) systems. 5G communication systems are considered to be implemented in higher frequency (millimeter (mm) wave) bands (e.g., the 60 GHz band) to achieve higher data rates. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies have been discussed in 5G communication systems. Furthermore, in 5G communication systems, improvements to the system network are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), and receiver interference cancellation. In 5G systems, hybrid frequency shift keying (FSK), quadrature amplitude modulation (QAM) (FQAM), and sliding window superposition coding (SWSC) have been developed as advanced coding and modulation (ACM), while filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) have been developed as advanced access technologies.

[0003] The internet is now evolving into the Internet of Things (IoT), in which distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE), combining IoT with big data processing technologies, has emerged through connectivity with cloud servers. Because IoT implementation requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have recently been studied. Such an IoT environment can provide intelligent internet technology services, creating new value for human life by collecting and analyzing data generated between connected objects. Through the convergence and integration of existing information technology (IT) and various industrial applications, IoT can be applied to a wide range of fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services. Summary of the Invention

[0004] Technical issues

[0005] However, there is a need in the art for a method and apparatus to overcome channel estimation failures and the resulting coverage problems when a base station configures physical uplink shared channel (PUSCH) repetition for a UE in a 5G system to increase PUSCH transmission coverage and the UE performs PUSCH transmission repetition.

[0006] Problem Solution

[0007] This disclosure addresses at least the aforementioned problems and / or disadvantages, and provides at least the following advantages.

[0008] Therefore, one aspect of this disclosure is to provide a method and apparatus for overcoming channel estimation defects when a base station configures PUSCH repetition for a UE in a 5G system to increase PUSCH transmission coverage and the UE performs PUSCH transmission repetition.

[0009] Another aspect of this disclosure is to provide a base station or UE that can repeatedly perform joint channel estimation for uplink channel transmission, thereby accurately performing channel estimation and achieving increased uplink channel coverage.

[0010] Another aspect of this disclosure is to provide a method for controlling the consistency of transmission power, phase continuity and beam configuration of repeated uplink channel transmissions, thereby performing joint channel estimation for repeated uplink channel transmissions.

[0011] According to one aspect of this disclosure, a method performed by a terminal in a communication system includes receiving configuration information for PUSCH repetition from a base station, identifying a time-domain window for configuring the PUSCH repetition based on the configuration information, and performing one or more repetitions of PUSCH transmission with the base station within the configured time-domain window, wherein power consistency and phase continuity of the PUSCH transmission are maintained in the one or more repetitions, and wherein one or more transmission power control (TPC) commands accumulated within the configured time-domain window are applied after the configured time-domain window.

[0012] According to another aspect of this disclosure, a method performed by a base station in a communication system includes: sending configuration information for PUSCH repetition to a terminal, and performing one or more repetitions of PUSCH reception of the terminal within a configured time-domain window, wherein the configured time-domain window is based on the configuration information, wherein power consistency and phase continuity of the PUSCH reception are maintained in the one or more repetitions, and wherein one or more TPC commands accumulated in the configured time-domain window are applied after the configured time-domain window.

[0013] According to another aspect of this disclosure, a terminal in a communication system includes a transceiver; and a controller coupled to the transceiver and configured to receive configuration information for PUSCH repetition from a base station, identify a time-domain window for configuring PUSCH repetition based on the configuration information, and perform one or more repetitions of PUSCH transmission with the base station within the configured time-domain window, wherein power consistency and phase continuity of the PUSCH transmission are maintained in the one or more repetitions, and wherein one or more TPC commands accumulated in the configured time-domain window are applied after the configured time-domain window.

[0014] According to another aspect of this disclosure, a base station in a communication system includes a transceiver and a controller, the controller being coupled to the transceiver and configured to send configuration information for PUSCH repetition to a terminal, and to perform one or more repetitions of PUSCH reception with the terminal within a configured time-domain window, wherein the configured time-domain window is based on the configuration information, wherein power consistency and phase continuity of the PUSCH reception are maintained in the one or more repetitions, and wherein one or more TPC commands accumulated in the configured time-domain window are applied after the configured time-domain window.

[0015] Beneficial effects of the invention

[0016] According to various embodiments of this disclosure, a base station or UE can repeatedly perform joint channel estimation for uplink channel transmissions, thereby accurately performing channel estimation and achieving increased uplink channel coverage.

[0017] According to various embodiments of this disclosure, a method for repeatedly controlling the constancy (or consistency) of transmission power, the continuity of phase, and beam configuration for uplink channel transmission can be provided, so that repeated joint channel estimation for uplink channel transmission can be performed accurately. Attached Figure Description

[0018] The above and other aspects, features and advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 The basic time-frequency structure of a wireless resource area is shown, in which data or control channels are transmitted in a 5G system to which this disclosure can be applied.

[0020] Figure 2 The time slot structure considered in a 5G system to which this disclosure can be applied is shown;

[0021] Figure 3The demodulation reference signal (DMRS) patterns (type 1 and type 2) for communication between a base station and a UE in a 5G system to which this disclosure is applicable are shown.

[0022] Figure 4 The present invention illustrates channel estimation in the time domain using DMRS received from a single PUSCH in a 5G system to which this disclosure is applicable;

[0023] Figure 5 This illustrates joint channel estimation in the time domain using DMRS received from multiple PUSCHs in a 5G system to which this disclosure is applicable;

[0024] Figure 6 PUSCH repetition type B is shown in a 5G system to which this disclosure can be applied;

[0025] Figure 7 A method for setting the PUSCH transmission power for joint channel estimation in the case of PUSCH repetition type B, according to an embodiment, is shown.

[0026] Figure 8 A method for setting the PUSCH transmission power using values ​​for joint channel estimation in the case of PUSCH repetition type B, according to an embodiment, is shown.

[0027] Figure 9 A method for setting the PUSCH transmission power using values ​​for joint channel estimation in the case of PUSCH repetition type B, according to an embodiment, is shown.

[0028] Figure 10 A method for setting the PUSCH transmission power for joint channel estimation is shown according to an embodiment when PUSCH repetition and frequency hopping are configured.

[0029] Figure 11 This illustrates discontinuous PUSCH repeating configured according to an embodiment;

[0030] Figure 12A A method for identifying phase continuity associated with discontinuous PUSCH repetitions, according to an embodiment, is illustrated.

[0031] Figure 12B An example location of the demodulation reference signal (DM-RS) according to an embodiment is shown;

[0032] Figure 13 A beam configuration based on a PUSCH repetition configuration that takes into account multiple transmit and receive points (TRPs) is shown according to an embodiment;

[0033] Figure 14A cyclic mapping method is shown according to an embodiment when repeating PUSCH transmissions that take into account multiple TRPs is performed, and a beam configuration method using variables for joint channel estimation is also shown.

[0034] Figure 15 A method for configuring frequency hopping when repeating PUSCH transmissions that take into account multiple TRPs is performed, according to an embodiment, is shown, as well as a beam configuration method using variables for joint channel estimation;

[0035] Figure 16 The operation of a base station for repeated joint channel estimation of PUSCH transmissions according to an embodiment is illustrated.

[0036] Figure 17 The operation of a UE configured with repeated joint channel estimation for PUSCH transmissions according to an embodiment is illustrated.

[0037] Figure 18 The structure of the UE according to an embodiment is shown; and

[0038] Figure 19 The structure of a base station according to an embodiment is shown. Detailed Implementation

[0039] In the following description of embodiments of the present disclosure, embodiments will be described in detail with reference to the accompanying drawings. In the following description of embodiments of the present disclosure, for the sake of clarity and brevity, descriptions related to techniques well known in the art and not directly related to the present disclosure will be omitted.

[0040] In the accompanying drawings, some elements may be enlarged, omitted, or shown schematically. The size of each element does not perfectly reflect its actual size. Identical or corresponding elements in the drawings have the same reference numerals.

[0041] The advantages and features of this disclosure will become clear from the embodiments described in detail below with reference to the accompanying drawings. However, this disclosure is not limited to the embodiments set forth below and can be implemented in various forms. The following embodiments are provided only to fully disclose this disclosure and to inform those skilled in the art of its scope, and this disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals denote the same or similar elements. The terminology described below is defined in consideration of the functionality in this disclosure and may vary depending on the user, the user's intent, or custom. Therefore, the definition of the terminology should be based on the entire contents of the specification.

[0042] In this document, a base station is an entity that allocates resources to a terminal and can be at least one of a gNode B, eNode B, Node B, base station (BS), radio access unit, base station controller, and node on a network. A terminal can include a UE, mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. "Downlink" (DL) refers to a radio link through which a base station transmits signals to a terminal, and "uplink" (UL) refers to a radio link through which a terminal transmits signals to a base station. Although the following description is exemplified for LTE or LTE-A systems, embodiments of this disclosure can also be applied to other communication systems with similar technical backgrounds or channel types. Examples of other communication systems may include fifth-generation mobile communication technologies (5G, New Radio, NR) developed in addition to LTE-A, and 5G can cover existing LTE, LTE-A, and other similar services. Furthermore, based on the determination of those skilled in the art, this disclosure can be applied to other communication systems with some modifications without explicitly departing from the scope of this disclosure.

[0043] Although the description of the methods and apparatus provided in the embodiments of this disclosure describes the embodiments of this disclosure as increasing the coverage area of ​​the PUSCH, this disclosure is not limited thereto and is applicable to methods for configuring frequency resources corresponding to additional channels using all or a combination of some of the embodiments provided in this disclosure. Therefore, those skilled in the art can modify the embodiments of this disclosure without departing from the scope of this disclosure.

[0044] Wireless communication systems have evolved to provide broadband wireless communication systems that offer high-speed and high-quality packet data services in addition to the voice-based services provided in the initial stages, such as 3GPP's High-Speed ​​Packet Access (HSPA), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced (LTE-A), LTE-pro, 3GPP2's High-Speed ​​Packet Data (HRPD), Ultra Mobile Broadband (UMB), and IEEE's 802.16e.

[0045] As a representative example of a broadband wireless communication system, the LTE system employs Orthogonal Frequency Division Multiplexing (OFDM) for the downlink and Single-Carrier Frequency Division Multiple Access (SC-FDMA) for the uplink. The uplink is the radio link through which a User Equipment (UE) or Mobile Station (MS) transmits data or control signals to a base station (eNode B (eNB) or Base Station (BS)). The downlink is the radio link through which the base station transmits data or control signals to the UE. In the multiple access schemes described above, the time-frequency resources used to transmit data or control information are allocated and operated in a manner that prevents resource overlap; that is, orthogonality is established between users to identify the data or control information of each user.

[0046] As a 5G communication system beyond LTE, it may need to support services that simultaneously meet various requirements, freely reflecting the diverse needs of users, service providers, and others. Services considered for 5G communication systems may include enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC).

[0047] eMBB aims to provide higher data transmission rates than those supported by conventional LTE, LTE-A, or LTE-pro. For example, in 5G communication systems, from the perspective of a single base station, eMBB needs to provide a peak data rate of up to 20Gbps in the downlink and up to 10Gbps in the uplink. Furthermore, 5G communication systems need to provide increased user-perceived data rates for the UE while delivering peak data rates. To meet these requirements, improved transmit or receive technologies incorporating advanced MIMO transmission techniques are needed. Additionally, conventional LTE uses a maximum transmission bandwidth of 20MHz in the 2GHz band. However, 5G communication systems use frequency bandwidths wider than 20MHz in the 3-6GHz band or in bands greater than or equal to 6GHz, thus meeting the data transmission speeds required by 5G communication systems.

[0048] Furthermore, 5G communication systems consider mMTC (modular machine-type communication) to support application services such as IoT. For example, mMTC requires support for a large number of UEs within a cell, increased UE coverage areas, improved battery life, and reduced UE costs to effectively deliver IoT. IoT provides communication capabilities by attaching to various sensors and devices, thus requiring support for a large number of UEs within a cell (e.g., 1,000,000 UEs / km²). Moreover, in terms of service characteristics, UEs supporting mMTC are likely to be located in shadow areas not covered by the cell (such as building basements) and may require wider coverage than other services offered by 5G communication systems. UEs supporting mMTC need to be manufactured as inexpensive UEs, and their batteries may not be replaced frequently. Therefore, long battery life, such as 10 to 15 years, may be required.

[0049] URLLC is a cellular-based mission-critical wireless communication service. Examples include remote control services for robots or machinery, industrial automation services, unmanned aerial vehicle services, remote healthcare services, and emergency alert services. Therefore, communication provided by URLLC may require very low latency and very high reliability. For example, services supporting URLLC need to meet an air interface latency of less than 0.5 milliseconds and a latency of less than or equal to 10... -5 The packet error rate. Therefore, for services supporting URLLC, 5G systems need to provide smaller transmission time intervals (TTIs) than other services, and in parallel, they need to allocate wide resources in the frequency band to ensure the reliability of the communication link.

[0050] The three services that can be used interchangeably with 5G systems—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. In this case, different transmission or reception schemes and parameters can be used between the services to meet their different requirements.

[0051] Figure 1 The basic time-frequency structure of a wireless resource area is shown, in which data or control channels are transmitted in a 5G system to which this disclosure is applicable.

[0052] exist Figure 1 In the diagram, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In both the time and frequency domains, the basic unit of a resource is a resource element (RE) 101, defined by an OFDM symbol (or Discrete Fourier Transform Extended OFDM (DFT-s-OFDM) symbol) 102 on the time axis and a subcarrier 103 on the frequency axis. In the frequency domain… A series of consecutive REs (e.g., 12 REs) can be a single resource block (RB) 104. Furthermore, in the time domain... A consecutive OFDM symbol can be a single subframe 110.

[0053] Figure 2 The time slot structure considered in a 5G system to which this disclosure can be applied is shown.

[0054] refer to Figure 2 , Figure 2 The structure of frame 200, subframe 201, and time slot 202 is shown. A single frame 200 can be defined as 10 milliseconds. A single subframe 201 can be defined as 1 millisecond. Therefore, a frame 200 can include a total of 10 subframes 201. Furthermore, single time slots 202 and 203 can be defined as 14 OFDM symbols (e.g., the number of symbols per time slot). A subframe 201 may include one or more time slots 202 and 203, and the number of time slots 202 and 203 in each subframe 201 may vary depending on μ204 and 205, which are settings for the subcarrier spacing.

[0055] Figure 2 The time slot structure is shown when the subcarrier spacing is set to μ = 0.204 and when the subcarrier spacing is set to μ = 1.205. When μ = 0.204, a single subframe 201 may include one time slot 202. When μ = 1.205, a single subframe 201 may include two time slots 203. The number of time slots per subframe depends on the subcarrier spacing setting value μ. They can be different. Therefore, the number of time slots per frame... They can also be different. Based on the subcarrier spacing setting value μ, and It can be defined as listed in Table 1 below.

[0056] Table 1

[0057]

[0058] The demodulation reference signal (DMRS), which is one of the reference signals in the 5G system, will then be described in detail.

[0059] A DMRS comprises multiple DMRS ports, and these ports maintain orthogonality to prevent interference when using code division multiplexing (CDM) or FDM. Depending on the user's intent and the purpose of using the reference signal, the term DMRS may be replaced by other terms. DMRS is an example used to describe the technical content of this disclosure and to aid in understanding it, but this disclosure is not limited thereto. That is, it will be clear to those skilled in the art to which this disclosure pertains that the embodiments are applicable to reference signals based on the technical spirit of this disclosure.

[0060] Figure 3 The diagrams (Type 1 and Type 2) for communication between a base station and a UE in a 5G system to which this disclosure is applicable are shown.

[0061] 5G systems can support two DMRS patterns. (Reference) Figure 3 Figures 301 and 302 correspond to DMRS Type 1. Figure 301 corresponds to a one-symbol pattern, while Figure 302 corresponds to a two-symbol pattern. DMRS Type 1 is a comb-type DMRS pattern that can include two CDM groups, and the different CDM groups can be frequency division multiplexing (FDM).

[0062] exist Figure 3 In a symbolic diagram of Figure 301, the frequency-based CDM is applied to the same CDM group, and two DMRS ports can be distinguished. Therefore, a total of four orthogonal DMRS ports can be configured. The DMRS port ID mapped to each CDM group is shown in Figure 301 (in the case of DL, the DMRS port ID is represented as the indicated number plus +1000). Figure 3 In the two symbolic patterns of Figure 302, the time / frequency CDM is applied to the same CDM group, and the four DMRS ports can be distinguished. Therefore, a total of 8 orthogonal DMRS ports can be configured. The DMRS port ID mapped to each CDM group is shown in Figure 302 (in the case of DL, the DMRS port ID is represented by the indicated number plus +1000).

[0063] The DMRS type 2 in Figures 303 and 304 is a DMRS pattern in which a frequency domain orthogonal cover code (FD-OCC) is applied to adjacent subcarriers on a frequency. It may include three CDM groups, and the different CDM groups may be frequency division multiplexing (FDM).

[0064] exist Figure 3In one symbolic diagram of Figure 303, the frequency-based CDM is applied to the same CDM group, and two DMRS ports can be distinguished. Therefore, a total of 6 orthogonal DMRS ports can be configured. The DMRS port ID mapped to each CDM group is shown in Figure 303 (in the case of DL, the DMRS port ID is represented as the indicated number plus +1000). In the two symbolic diagrams of Figure 304, the time / frequency-based CDM is applied to the same CDM group, and four DMRS ports can be distinguished. Therefore, a total of 12 orthogonal DMRS ports can be configured. The DMRS port ID mapped to each CDM group is shown in Figure 304 (in the case of DL, the DMRS port ID is represented as the indicated number plus +1000).

[0065] As described above, in a 5G system, two different DMRS patterns can be configured (illustrated as 301 and 302 or 303 and 304), and it can also be configured whether the DMRS pattern corresponds to one symbol pattern 301 and 303 or two adjacent symbol patterns 302 and 304. Furthermore, in a 5G system, DMRS port numbers can be scheduled, and the number of CDM groups scheduled together for Physical Downlink Shared Channel (PDSCH) rate matching can be configured and signaled. In the case of Cyclic Prefix-Based OFDM (CP-OFDM), both of the above DMRS patterns can be supported in both the downlink and uplink. In the case of Discrete Fourier Transform Extended OFDM (DFT-S-OFDM), only DMRS type 1 of the above DMRS patterns is supported in the uplink. Additionally, additional DMRS can be configured to appear in the first symbol in time, and these additional DMRS are referred to as DMRS following the front-loaded DMRS. In an NR system, the number of additional DMRSs can be set to a value ranging from a minimum limit of 0 to a maximum limit of 3. If additional DMRSs are configured, it is assumed that they may have the same pattern as the preceding DMRSs. More specifically, this is indicated when information is provided indicating whether the DMRS pattern type associated with the preceding DMRS corresponds to type 1 or type 2, whether the DMRS pattern corresponds to one symbol pattern or two adjacent symbol patterns, and information associated with the number of CDM groups and the number of DMRS ports used. If additional DMRSs are further configured, it is assumed that the additional DMRSs are configured with the same DMRS information as the preceding DMRSs.

[0066] Specifically, the downlink DMRS configuration and uplink DMRS configuration described above can be configured via RRC signaling as shown in Tables 2 and 3 below.

[0067] Table 2

[0068]

[0069] Table 3

[0070]

[0071] Figure 4 Channel estimation using DMRS received from a single PUSCH in the time domain is illustrated in a 5G system to which this disclosure can be applied.

[0072] When performing channel estimation for decoded data using the aforementioned DMRS, channel estimation is performed within a Precoding Resource Block Group (PRG), which is a bundling unit, by using PRBs associated with the system frequency band in the frequency band. Furthermore, in the time unit, channel estimation can be performed by assuming that only DMRS received from a single PUSCH have the same precoding.

[0073] Figure 5 This paper illustrates joint channel estimation in the time domain using DMRS received from multiple PUSCHs in a 5G system to which this disclosure can be applied.

[0074] The base station can be configured to instruct the UE whether to use the same precoding. Therefore, the base station can use DMRS transmissions that use the same precoding to estimate the channel and improve channel estimation performance.

[0075] Furthermore, in order to perform joint channel estimation using the DMRS of multiple PUSCHs received from the UE, the base station can perform a configuration such that the UE maintains power consistency and phase continuity of the multiple PUSCH transmissions and transmits the multiple PUSCHs. In this disclosure, maintaining power consistency and phase continuity of PUSCH transmissions indicates that the multiple PUSCH transmissions used for joint channel estimation satisfy at least one or a combination of the following conditions. These conditions are merely examples, but this disclosure is not limited thereto. That is, the multiple PUSCH transmissions used for joint channel estimation can be configured to satisfy some of the following conditions, or some conditions can be modified or omitted.

[0076] 1. Multiple PUSCH transmissions used for joint channel estimation should have the same modulation order.

[0077] 2. Multiple PUSCH transmissions used for joint channel estimation should be assigned the same number of Restricted Blocks (RBs). For example, multiple PUSCH transmissions used for joint channel estimation should be assigned to the same frequency location and should have the same number of Restricted Blocks (or the same Restricted Block length). Alternatively, for example, inter-slot frequency hopping and intra-slot frequency hopping should not be applied to multiple PUSCH transmissions used for joint channel estimation.

[0078] 3. Multiple PUSCH transmissions used for joint channel estimation should have the same transmission power. This means that the power control parameters are identical. Furthermore, this indicates that the dynamic transmission power of PUSCH transmissions based on carrier aggregation (CA) configuration is not shared among the multiple PUSCH transmissions used for joint channel estimation.

[0079] 4. Multiple PUSCH transmissions used for joint channel estimation should have the same beam configuration. For example, beam switching should not be performed between multiple PUSCH transmissions used for joint channel estimation.

[0080] 5. Downlink and additional uplink transmissions or receptions should not be performed between multiple PUSCH transmissions used for joint channel estimation.

[0081] If at least one condition or a combination of conditions is not met, it is determined (or identified) that the power consistency and phase continuity of the PUSCH transmission have not been maintained.

[0082] Based on the above conditions, the UE can apply the same modulation order, the same number of RBs, the same frequency location, the same precoding, and the same beam to maintain power consistency and phase continuity of multiple PUSCHs configured by the base station. The UE can avoid performing downlink and additional uplink transmissions or receptions between multiple PUSCH transmissions used for joint channel estimation.

[0083] like Figure 4 As shown, in Figure 5 In the case of performing channel estimation for decoded data using DMRS, channel estimation is performed within a Precoding Resource Block Group (PRG), which is a bundling unit, by using PRBs associated with the system frequency band in the frequency band. Furthermore, within a time unit (time window), channel estimation can be performed by assuming that only DMRS received via one or more PUSCHs have the same precoding. As described above, channel estimation based on multiple DMRSs in the time domain is allowed, thus improving channel estimation performance. In particular, even with good data decoding performance, channel estimation performance can become a bottleneck. Therefore, channel estimation performance is considered crucial for increasing coverage area.

[0084] The following describes a method for allocating time-domain resources to data channels in a 5G communication system. The base station can configure tables associated with time-domain resource allocation information for the UE via higher-layer signaling (e.g., RRC signaling) and the PDSCH and PUSCH.

[0085] The base station can configure a table with up to 16 entries (maxNrofDL-Allocations = 16) associated with the PDSCH and a table with up to 16 entries (maxNrofUL-Allocations = 16) associated with the PUSCH. Time-domain resource allocation information may include PDCCH to PDSCH slot timing (corresponding to the time interval based on slot units between the time point of receiving the PDCCH and the time point of transmitting the PDSCH scheduled by the received PDCCH, and represented by K0) or PDCCH to PUSCH slot timing (corresponding to the time interval based on slot units between the time point of receiving the PDCCH and the time point of transmitting the PUSCH scheduled by the received PDCCH, and represented by K2), information associated with the length and start symbol position of the PDSCH or PUSCH scheduled in the slot, PDSCH or PUSCH mapping type, etc. For example, the information shown in the table below can be reported from the base station to the UE.

[0086] Table 4

[0087]

[0088] Table 5

[0089]

[0090] The base station can notify the UE of one of the entries in the table associated with the time-domain resource allocation information via L1 signaling (e.g., downlink control information (DCI)) (e.g., providing an indication using the 'time-domain resource allocation' field in the DCI). Based on the DCI received from the base station, the UE can obtain the time-domain resource allocation information associated with the PDSCH or PUSCH.

[0091] The following sections describe in detail the transmission of uplink data channels (Physical Uplink Shared Channel (PUSCH)) in a 5G system. PUSCH transmissions can be dynamically scheduled by uplink licenses in the DCI, or can be operated according to configured license type 1 or type 2. The dynamic scheduling indication associated with PUSCH transmissions can be executed based on DCI format 0_0 or 0_1.

[0092] Conversely, receiving uplink grants in the DCI allows for semi-static configuration of configuration grant type 1 PUSCH transports via higher signaling, by receiving the configuredGrantConfig (including rrc-ConfiguredUplinkGrant) from Table 6 below. After receiving the configuredGrantConfig (excluding rrc-ConfiguredUplinkGrant) from Table 6 via higher signaling, configuration grant type 2 PUSCH transports can be semi-continuously scheduled via uplink grants in the DCI. If a PUSCH transport operates via configuration grants, the parameters applied to the PUSCH transport can be applied via the higher signaling configuredGrantConfig from Table 6, instead of the dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH provided by the higher signaling pusch-Config from Table 7 below. If the UE receives the transformPrecoder in the higher signaling configuredGrantConfig in Table 6, the UE can apply tp-pi2BPSK in pusch-Config in Table 7 to the PUSCH transport that operates based on the configuration grant.

[0093] Table 6

[0094]

[0095] The DMRS antenna port used for PUSCH transmission can be the same as the antenna port used for SRS transmission. PUSCH transmission can be performed according to a codebook-based or non-codebook-based transmission method, depending on whether the value of txConfig in the higher signaling pusch-Config in Table 7 is codebook or non-Codebook. As mentioned above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1 and can be semi-statically configured via configuration permission. If the UE receives an indication associated with PUSCH transmission scheduling via DCI format 0_0, the UE uses pucch-spatialRelationInfoID to perform beam configuration for PUSCH transmission, which corresponds to the UE-specific PUCCH resource with the smallest ID in the uplink BWP activated in the serving cell. In this case, PUSCH transmission is performed based on a single antenna port. In a BWP without a configured PUCCH resource including pucch-spatialRelationInfo, the UE does not expect PUSCH transmission to be scheduled via DCI format 0_0. If the UE is not configured with txConfig in pusch-Config in Table 7, the UE may not expect to be scheduled via DCI format 0_1.

[0096] Table 7

[0097]

[0098] Codebook-based PUSCH transmissions can be dynamically scheduled via DCI format 0_0 or 0_1, and can be configured semi-statically with configuration permission. If codebook-based PUSCH transmissions are dynamically scheduled via DCI format 0_1 ​​or configured semi-statically with configuration permission, the UE can determine the precoder used for PUSCH transmissions based on the SRS resource indicator (SRI), the transport precoding matrix indicator (TPMI), and the transport rank (PUSCH transport layer number).

[0099] In this scenario, the SRI can be provided by the SRS resource indicator field in the DCI, or configured via higher signaling according to the srs-ResourceIndicator. In the case of codebook-based PUSCH transmission, the UE can be configured with at least one SRS resource and up to two SRS resources. If the UE receives an SRI via the DCI, the SRS resource indicated by the corresponding SRI can be the SRS resource corresponding to that SRI from the SRS resources pre-sent to the PDCCH including the corresponding SRI. Furthermore, the TPMI and transport rank can be provided by the precoding information and number of layers fields in the DCI, or configured via higher signaling according to precodingAndNumberOfLayers. The TPMI is used to indicate the precoder applied to the PUSCH transmission.

[0100] A precoder for PUSCH transmission can be selected from the uplink codebook, which has as many antenna ports as the value of nrofSRS-Ports in the SRS-Config via higher signaling. In codebook-based PUSCH transmission, the UE can determine a subset of the codebook based on TPMI and codebookSubset in the push-Config via higher signaling. Based on the UE capabilities reported to the base station, codebookSubset in the push-Config via higher signaling can be set to one of fullyAndPartialAndNonCoherent, partialAndNonCoherent, or nonCoherent. If the UE reports partialAndNonCoherent as a UE capability, the UE may not expect the value of codebookSubset via higher signaling to be set to fullyAndPartialAndNonCoherent. If the UE reports nonCoherent as a UE capability, the UE may not expect the value of codebookSubset via higher signaling to be set to fullyAndPartialAndNonCoherent or partialAndNonCoherent. If two SRS antenna ports are indicated in the nrofSRS-Ports of the SRS-ResourceSet via higher signaling, the UE may not expect the value of codebookSubset, which is the higher signaling, to be set to partialAndNonCoherent.

[0101] A UE can be configured with an SRS resource set for which the usage value in the SRS-ResourceSet via higher signaling is set to codebook, and an SRS resource in the corresponding SRS resource set can be indicated via SRI. If multiple SRS resources are configured in the SRS resource set (for which the usage value in the SRS-ResourceSet via higher signaling is set to codebook), the UE can expect the value of nrofSRS-Ports in the SRS-Resource via higher signaling to be set to be the same for all SRS resources.

[0102] The UE can send one or more SRS resources included in an SRS resource set (for which the value is set to codebook according to the purpose of higher signaling) to the base station. The base station can select one of the SRS resources sent from the UE and can provide an indication that the UE uses the transmission beam information of the corresponding SRS resource to send PUSCH transmissions. In this codebook-based PUSCH transmission, the SRI is used as an index for selecting SRS resources and can be included in the DCI. Additionally, the base station can include information in the DCI indicating the TPMI and rank to be used by the UE for PUSCH transmissions. By using the SRS resources indicated by the SRI, the UE can perform PUSCH transmissions by applying a precoder based on the transmission beam of the corresponding SRS resource and the indicated TPMI and rank.

[0103] Non-codebook-based PUSCH transmissions can be dynamically scheduled via DCI format 0_0 or 0_1, and can be configured to operate semi-statically. If at least one SRS resource is configured in an SRS resource (for which the usage value in the SRS-ResourceSet via higher signaling is set to nonCodebook), the UE can be scheduled for non-codebook-based PUSCH transmissions via DCI format 0_1.

[0104] For an SRS resource set whose usage value is set to nonCodebook via higher signaling in the SRS-ResourceSet, the UE can be configured with a connected non-zero power CSI-RS (NZP CSI-RS) resource. The UE can perform calculations associated with the precoder used for SRS transmissions by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the non-periodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the non-periodic SRS transmission from the UE is less than 42 symbols, the UE may not expect the information associated with the precoder used for SRS transmissions to be updated.

[0105] If the resourceType value in the SRS-ResourceSet via higher signaling is set to aperiodic, the connected NZP CSI-RS can be indicated by the SRS Request field in DCI format 0_1 ​​or 1_1. In this case, if the connected NZP CSI-RS resource is an aperiodic NZP CSI resource, this can indicate the existence of a connected NZP CSI-RS when the value of the SRS Request field in DCI format 0_1 ​​or 1_1 is not 00. In this case, the corresponding DCI may not need to indicate cross-carrier or cross-BWP scheduling. If the SRS Request value indicates the existence of an NZP CSI-RS, the NZP CSI-RS can reside in the time slot in which the PDCCH including the SRS Request field is transmitted. In this case, the TCI state configured for the scheduled subcarrier may not be set to QCL-TypeD.

[0106] If a periodic or semi-continuous SRS resource set is configured, the associated CSI-RS in the SRS-ResourceSet via high signaling can be indicated by the connected NZP CSI-RS. For non-codebook-based transmissions, the UE may not expect the spatialRelationInfo of the SRS resource via higher signaling and the associated CSI-RS in the SRS-ResourceSet via higher signaling to be configured together.

[0107] If multiple SRS resources are configured, the UE can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. In this case, the SRI can be indicated by the SRS resource indicator field in the DCI, or it can be configured according to the srs-ResourceIndicator via higher signaling. Similar to the codebook-based PUSCH transmission described above, if the UE receives an SRI via the DCI, the SRS resource indicated by the corresponding SRI can be the SRS resource corresponding to that SRI from the SRS resources pre-sent to the PDCCH including that corresponding SRI. The UE can use one or more SRS resources for SRS transmission. The maximum number of SRS resources that can be transmitted simultaneously in one symbol within an SRS resource set, and the maximum number of SRS resources, can be determined based on the UE capabilities reported by the UE to the base station. In this case, the SRS resources that the UE can transmit simultaneously can occupy the same RB. The UE can set one SRS port for each SRS resource. If the value in the SRS-ResourceSet via high signaling is set to a non-Codebook SRS resource set, only one SRS resource set can be configured. When SRS resources are used for non-codebook-based PUSCH transmissions, a total of 4 SRS resources can be configured.

[0108] The base station can send an NZP CSI-RS connected to the SRS resource set to the UE. Based on the measurements obtained upon receiving the corresponding NZPCSI-RS, the UE can calculate a precoder to be used for transmitting one or more SRS resources in the corresponding SRS resource set. The UE can apply the calculated precoder when sending one or more SRS resources from the SRS resource set (for which the usage is set to nonCodebook) to the base station, and the base station can select one or more SRS resources from the received SRS resources. In this case, in the case of nonCodebook-based PUSCH transmission, the SRI indication can express an index of one or more SRS resources or combinations thereof, and the SRI can be included in the DCI. In this case, the number of SRS resources indicated by the SRI sent by the base station can be the number of transport layers of the PUSCH. The UE can transmit the PUSCH by applying the precoder applied to each layer to the SRS resource transmission.

[0109] When a UE performs PUSCH transmissions via DCI format 0_1 ​​in a PDCCH that includes Cyclic Redundancy Check (CRC) scrambled with Cell Radio Network Temporary Identifier (C-RNTI), MCS-C-RNTI, or CS-RNTI, if the UE is configured with a pusch-AggregationFactor via higher-layer signaling, the same symbol allocation can be applied to consecutive time slots, the number of which is pusch-AggregationFactor, and the PUSCH transmission can be limited to single-rank transmission. For example, the UE may need to repeat the same transport block (TB) in consecutive time slots, the number of which is pusch-AggregationFactor, and the same symbol allocation needs to be applied to each time slot. Table 8 below indicates the redundant version of the repetition applied to the PUSCH transmission for each time slot. If the UE repeats PUSCH transmissions in multiple time slots via DCI format 0_1, and in the time slot where PUSCH repetition is performed according to the information of tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated via higher-layer signaling, at least one symbol is indicated as a downlink symbol, then the UE may not perform PUSCH transmissions in the time slot where the corresponding symbol is located.

[0110] Table 8

[0111]

[0112] In 5G systems, two types of uplink data channel transmission repetition methods are supported: PUSCH repetition type A and PUSCH repetition type B. A UE can be configured with either PUSCH repetition type A or PUSCH repetition type B via higher-layer signaling.

[0113] PUSCH Repeat Type A

[0114] As described above, the start symbol and length of the uplink data channel can be determined according to the method of allocating time-domain resources within a single time slot, and the base station can notify the UE of the number of repetitions transmitted via RRC signaling or L1 signaling (e.g., DCI).

[0115] Based on the number of repetitions of transmissions received from the base station, the UE can repeatedly transmit uplink data channels in consecutive time slots, with the start symbol and length of the uplink data channel being the same as those configured above. In this case, the UE can omit uplink data channel transmission in time slots configured as downlink by the base station for the UE, or when at least one symbol in the uplink data channel symbols configured for the UE is configured as downlink.

[0116] PUSCH repeat type B

[0117] As described above, the start symbol and length of the uplink data channel can be determined based on the method of allocating time-domain resources within a single time slot, and the base station can notify the UE of the number of repetitions via RRC signaling or L1 signaling (e.g., DCI).

[0118] First, based on the start symbol and length of the configured uplink data channel, the nominal repetition of the uplink data channel can be determined as follows. The nominal repetition indicates the symbol resources configured by the base station for PUSCH repetition, and the UE can determine the resources available for uplink use within the configured nominal repetition. In this case, the time slot at the start of the nth nominal repetition is determined by... The symbol for the nominal repetition to begin in the start time slot is given, and is determined by... The time slot at the end of the nth nominal repetition is given by... The symbol given, and the symbol indicating the end of the nominal repetition in the last time slot, is... Given: Here, n = 0, ..., numberofrepetitions-1, S represents the start symbol of the configured uplink data channel, and L represents the symbol length of the configured uplink data channel. K s This indicates the time slot at which the PUSCH transmission begins, and This indicates the number of symbols in each time slot.

[0119] The UE determines invalid symbols for PUSCH repetition type B. Symbols configured for downlink via tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated can be determined as invalid symbols for PUSCH repetition type B. Furthermore, invalid symbols can be set based on higher-layer parameters (e.g., InvalidSymbolPattern). For example, invalid symbols can be set by providing a symbol-level bitmap occupying a single or two time slots via a higher-layer parameter (e.g., InvalidSymbolPattern). A 1 in the bitmap can indicate an invalid symbol. Additionally, the period and pattern of the bitmap can be set via higher-layer parameters (e.g., periodicityAndPattern). If a higher-layer parameter (e.g., InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 parameter indicates 1, the UE applies the invalid symbol pattern. If this parameter indicates 0, the UE may not apply an invalid symbol pattern. If a higher-level parameter (e.g., InvalidSymbolPattern) is set and the InvalidSymbolPatternIndicator--ForDCIFormat0_1 or InvalidSymbolPatternIndicator--ForDCIFormat0_2 parameter is not set, the UE may apply an invalid symbol pattern.

[0120] The UE identifies invalid symbols in each nominal repetition and considers the remaining symbols after excluding the identified invalid symbols as valid symbols. If each nominal repetition includes one or more valid symbols, the nominal repetition may include one or more actual repetitions. Each actual repetition indicates the symbols actually used for PUSCH repetition among the symbols configured for the nominal repetition, and the set of consecutive valid symbols that can be used for PUSCH repetition type B can be included in a single time slot. Except when the symbol length of the configured uplink data channel is L=1, the UE may omit actual repetition transmission if an actual repetition with a single symbol is set to valid.

[0121] Figure 6 The PUSCH repeat type B in a 5G system applicable to this disclosure is shown.

[0122] refer to Figure 6When the UE is configured such that the start symbol S of the uplink data channel is set to 10, the length L is set to 6, and the number of transmission repetitions is set to 3, nominal repetition 601 appears in three consecutive time slots. To determine invalid symbols, the UE identifies the symbols configured as downlink symbols in each nominal repetition as invalid symbols, and can also identify symbols set to 1 in invalid symbol pattern 602 as invalid symbols. If one or more consecutive valid symbols, instead of invalid symbols, are configured in a single time slot in each nominal repetition, the UE can configure actual repetition 603 including one or more consecutive symbols in a single time slot.

[0123] In 5G systems, for each PUSCH repetition type, two frequency hopping methods for the uplink data channel can be supported. PUSCH repetition type A supports intra-slot frequency hopping and inter-slot frequency hopping. PUSCH repetition type B supports inter-repetition frequency hopping and inter-slot frequency hopping.

[0124] The intra-slot frequency hopping method supported in PUSCH repetition type A can be that the UE changes the frequency offset between two transitions of the resource allocated in the frequency domain in a single time slot and sends that resource.

[0125] In intra-slot frequency hopping, the starting RB of each transition can be represented by equation (1), as shown below.

[0126]

[0127] In equation (1), i = 0 and i = 1 represent the first jump and the second jump, respectively. This represents the starting RB in the uplink BWP and is calculated according to the frequency resource allocation method. This represents the frequency shift between two transitions and is indicated by higher-level parameters. The number of symbols in the first transition can be expressed as... And the number of symbols in the second jump can be represented as It is the length of the PUSCH transmission in a single time slot, and can be expressed as the number of OFDM symbols.

[0128] Subsequently, the inter-slot frequency hopping method supported in PUSCH repetition types A and B is a method in which the UE changes the set frequency offset for each time slot's allocated resources in the frequency domain and transmits those resources. In inter-slot frequency hopping, The start of RB in a time slot can be represented by equation (2), as shown below.

[0129]

[0130] In equation (2), This indicates the current slot number in a multi-slot PUSCH transmission, and This indicates the starting RB in the uplink and is calculated according to the frequency resource allocation method. This represents the frequency offset between two transitions and is indicated by higher-level parameters.

[0131] Subsequently, the inter-repetition frequency hopping method supported in PUSCH repetition type B is a method of shifting the frequency offset of the resources allocated in the frequency domain for one or more actual repetitions in each nominal repetition and performing the transmission. The RB serves as the index of the starting RB for one or more actual repetitions in the nth nominal repetition. start (n) can be given by equation (3) below.

[0132]

[0133] In equation (3), n represents the index of the nominal repetition, and This represents the RB offset between two transitions and is indicated by higher-level parameters.

[0134] The PUSCH transmission power can be determined by equation (4), as shown below.

[0135]

[0136] In equation (4), P CMAX，f，c (i) represents the maximum transmission power set for the UE at the carrier f of the serving cell c at the PUSCH transmission point i. It is a reference transmission power setting for the active uplink bandwidth portion (BWP) b of the carrier f of the serving cell c, and may vary depending on the transmission type j (i.e., whether the PUSCH transmission corresponds to message 3PUSCH for random access, whether the PUSCH is a configuration licensed PUSCH, or whether the PUSCH is a scheduled PUSCH). This indicates the magnitude of the frequency to which PUSCH is assigned. α b，f，c (j) represents the compensation rate for the uplink BWPb of carrier f in serving cell c, which can be set by a higher signal and can vary depending on j. PL b，f，c (q d ) is an estimate of the downlink path loss of the uplink BWP b of carrier f of serving cell c, and can be measured using a reference signal measured via the active downlink bandwidth. The reference signal can be an SS / PBCH block or CSI-RS. The downlink path loss can be calculated according to equation (3) as described above. Alternatively, PL b，f，c (q dΔ is the downlink path loss value, which is calculated by the UE according to equation (3). Depending on whether higher signaling is configured, the UE can calculate the path loss based on reference signaling resources associated with the CSI-RS or SS / PBCH block. As a reference signaling resource, a reference signaling resource set can be selected from various reference signaling resource sets via higher signaling or L1 signaling, and the UE can calculate the path loss based on that reference signaling resource. TF，b，f，c (i) is the value determined by the MCS value of the PUSCH at the PUSCH transmission point i of the uplink BWPb of carrier f in serving cell c. b，f，c (i, l) is the adaptive power control value, and the power value can be dynamically controlled based on the Transmit Power Control Command (TPC command). The TPC command is classified into cumulative mode and absolute mode, and can be determined as one of the two modes via higher signaling. In cumulative mode, the currently determined adaptive power control value is accumulated to the value indicated by the TPC command, which can be increased or decreased based on the TPC command, and can have f b，f，c (i, l) = f b，f，c (i-i0,l)+∑δ PUSCH，b，f，c It is provided in the form of a relationship. δ PUSCH，b，f，c This is the value indicated by the TPC command. In absolute mode, the value can be determined via the TPC command, independent of the currently determined power control adaptive value, and has f b，f，c (i, l) = δ PUSCH，b，f，c The relationship. Below Figure 9 The value indicated by the TPC command is shown.

[0137] Table 9

[0138]

[0139] In this scenario, TPC commands can be sent to the UE via either the UE-specific DCI or the group common DCI. Therefore, the base station can dynamically control the UE's transmission power via TPC commands.

[0140] The following describes a method for configuring joint channel estimation when PUSCH repetition is configured in a 5G communication system applying the present disclosure.

[0141] When performing repetition of PUSCH transmissions, joint channel estimation can be used to improve channel estimation performance and increase channel coverage. To effectively perform joint channel estimation on repetitions of PUSCH transmissions received by the base station, the UE may need to maintain phase continuity and consistency of PUSCH transmission power between repetitions of the PUSCH transmissions for which joint channel estimation is to be performed. Furthermore, the repetition of PUSCH transmissions needs to be performed via the same beam.

[0142] For joint channel estimation when performing PUSCH repetition in a 5G system to which this disclosure is applicable, a method for controlling PUSCH repetition is provided. For example, methods for controlling the PUSCH transmission power used for joint channel estimation, methods for determining phase continuity in PUSCH repetition, and methods for setting beams can be provided. The base station can perform joint channel estimation on optimized PUSCH repetition to obtain accurate channel estimation results. Therefore, uplink coverage area can be increased. Although PUSCH repetition is described herein as an example, this disclosure is not limited thereto. That is, this disclosure is applicable even when PUSCH repetition is predefined / configured, or when PUSCH / PUCCH is transmitted via signaling repetition between the base station and the UE. Furthermore, in the method for controlling the repetition of PUSCH transmission for joint channel estimation, the predefined / configured value or the value configured via signaling between the base station and the UE can be set to one or a combination of symbol / slot length, the gap between PUSCH / PUCCH transmissions, the number of PUSCH / PUCCH transmissions, a time-domain window (milliseconds) in the time domain, etc. Furthermore, the values ​​set for PUSCH transmission power consistency and phase continuity can be defined / configured based on the subcarrier spacing.

[0143] First Embodiment

[0144] The first embodiment of this disclosure can provide a method and apparatus for jointly estimating the repetition of PUSCH transmissions and controlling the PUSCH transmission power.

[0145] However, embodiments of this disclosure can be applied to PUSCH repetition type A, PDSCH, and physical side link shared channel (PSSCH).

[0146] Figure 7 A method for setting the PUSCH transmission power for joint channel estimation in the case of PUSCH repetition type B, according to an embodiment, is shown.

[0147] refer to Figure 7 This illustrates the change in PUSCH transmission power according to TPC commands 703 and 704 when PUSCH repetition is configured and PUSCH is transmitted via actual repetition 702 based on slot boundaries and nominal repetition 701. The PUSCH transmission power is set via higher-layer signaling or L1 signaling, and f b，f，c (i, l) = f b，f，c (i-i0,l)+∑δ PUSCH，b，f，c It is applied as a TPC command for each nominal repetition. n ·δ PUSCH，b，f，cThis is the value indicated by the TPC command. Therefore, for three different patterns that are actually repeated, the UE can use different PUSCH transmission powers to perform transmissions. In this case, if the base station performs joint channel estimation for consecutive repetitions of PUSCH transmissions, the consistency of PUSCH transmission power cannot be maintained, and the channel estimation performance may degrade. Hereinafter, this disclosure provides a method for controlling the consistency of transmission power for repetitions of PUSCH transmissions used for joint channel estimation, and one method may be determined as one or a combination of at least one of the following methods.

[0148] Method 1

[0149] If the base station configures a joint channel estimation for repetitions of PUSCH transmissions for the UE via higher-layer signaling or L1 signaling, the UE can maintain (or set or determine) the same transmission power for all repetitions of the PUSCH transmission. For example, if the configuration is performed such that numberofrepetitions = n via higher-layer signaling or L1 signaling, the UE can maintain P... PUSCH (i n-1 ,j,q d ,l)=P PUSCH (i0, j, q) d ,l), as the power of repetition in PUSCH transmission. In this case, the base station and UE may not need to perform additional and complex operations, and the base station can perform joint channel estimation for the repetition of PUSCH transmission.

[0150] Method 2

[0151] The base station can perform scheduling by distinguishing between a set of UEs used for joint channel estimation and UEs used for regular operations. For example, a UE can obtain δ from a set of common DCIs that includes CRCs scrambled with TPC-PUSCH-RNTI (or TPC-PUCCH-RNTI, TPC-SRS-RNTI) for setting up joint channel estimation. PUSCH，b，f，c =0.

[0152] Method 3

[0153] Method 3 provides a method for controlling PUSCH transmission power by using variables for joint channel estimation set via higher-layer signaling or L1 signaling to address the repetition of PUSCH transmissions.

[0154] Figure 8 A method for setting the PUSCH transmission power using values ​​for joint channel estimation in the case of PUSCH repetition type B, according to an embodiment, is shown.

[0155] Specifically, Figure 8 This diagram illustrates a method for controlling the power of PUSCH repetitions when PUSCH repetition type B is configured and the maximum number of actual repetitions, which is the range for joint channel estimation of repetitions for PUSCH transmissions, is set to 3 via higher-layer signaling and L1 signaling. If the configuration is performed such that the maximum number of actual repetitions = 3802, the base station can perform joint channel estimation for actual repetitions #0, #1, and #2, and then for actual repetitions #3, #4, and #5. In this case, P is set for actual repetitions #0, #1, and #2 based on the actual repetition unit for which joint channel estimation is to be performed. PUSCH (i0, j, q) d ,l), and set P for actual repetition of #3, #4, #5 PUSCH (i1, j, q) d This allows control over the PUSCH transmission power. If the actual number of repetitions is... Then you can use TPC command 803 to perform the configuration, making and In this case, the UE can be configured via higher-layer signaling and L1 signaling. To perform joint channel estimation.

[0156] Therefore, the same transmission power can be maintained between actual repetitions for joint channel estimation, and closed-loop power control (CLPC) based on TPC commands can be applied to each actual repetition unit to which joint channel estimation is to be performed. In this case, the same redundancy version, precoding, modulation order, PRB, etc., can be set based on the actual repetition set to which joint channel estimation is to be performed (e.g., (#0, #1, #2) or (#3, #4, #5)).

[0157] Figure 9 A method for setting the PUSCH transmission power using values ​​for joint channel estimation in the case of PUSCH repetition type B, according to an embodiment, is shown.

[0158] Specifically, Figure 9 A method for controlling the PUSCH transmission power used for joint channel estimation is shown when the gap between PUSCH repetition type B and actual repetition is configured via higher-layer signaling and L1 signaling.

[0159] If the gap between actual repetitions 901, configured by higher-layer signaling and L1 signaling, is greater than threshold 902, the UE can perform transmission by setting different PUSCH transmission powers. In this case, when TPC command 903 is configured, if the gap between PUSCHs is ≥ threshold, then... If the gap between PUSCHs is less than the threshold, then fb，f，c (i, l) = f b，f，c (i0, l).

[0160] Therefore, the same transmission power can be maintained between actual repetitions for joint channel estimation, and CLPC based on TPC commands can be applied to each actual repetition unit for which joint channel estimation has been performed, based on the determined gap. In this case, the same redundant version, precoding, modulation order, PRB, etc., can be set for the actual repetition set for which joint channel estimation has been performed.

[0161] Furthermore, based on information configured by the base station, the UE can apply the same precoding, modulation order, PRB, etc., to the actual repetition set for which joint channel estimation is to be performed. Additionally, the UE can apply the same redundant version to multiple PUSCH transmissions for which joint channel estimation will be performed for symbol-based decoding (I / Q combination). Alternatively, the UE can map / assign the same redundant version to / assigned to multiple PUSCH transmissions for which joint channel estimation will be performed for bit-based decoding (log-likelihood ratio (LLR) combination), or can perform mapping / assignment based on a redundant version index configured by the base station. Furthermore, the base station can perform configuration to maintain phase continuity using the same modulation order and frequency position. Additionally, based on information configured by the base station, the UE can omit or limit additional uplink and downlink transmissions in PUSCH transmissions for which joint channel estimation has been performed.

[0162] In the above description, the variables configured for joint channel estimation via higher-layer signaling and L1 signaling are merely examples, and this disclosure is not limited thereto. For example, at least one of the symbol / slot length and the number of nominal / actual repetitions can be configured as variables via higher-layer signaling and L1 signaling. Furthermore, this can be applied by using one of them or a combination thereof. In this method, the base station can adjust the variables configured for joint channel estimation by taking into account the channel state used for channel estimation and the capacity of the memory. Therefore, joint channel estimation for optimized PUSCH repetitions is allowed, thus accurate channel estimation can be performed, and channel coverage can be increased.

[0163] Furthermore, the values ​​for PUSCH transmission power consistency and phase continuity settings can be defined / set based on the subcarrier spacing. For example, if the time-domain window satisfying PUSCH transmission power consistency and phase continuity is set to 2 milliseconds and the subcarrier spacing is set to 15 kHz, then the value used for joint channel estimation can be determined / set to a maximum (Max) number of time slots = 2 (e.g., in the value used for joint channel estimation, the maximum number of time slots can be determined / set to 2). In this case, joint channel estimation can be performed for two time slots. Alternatively, if the time-domain window is set to 2 milliseconds and the subcarrier spacing is set to 30 kHz, then the value used for joint channel estimation can be determined / set to a maximum number of time slots = 4 (e.g., in the value used for joint channel estimation, the maximum number of time slots can be determined / set to 4). In this case, joint channel estimation can be performed for four time slots. In the same manner as above, the values ​​for PUSCH transmission power consistency and phase continuity settings can be defined / set based on the subcarrier spacing.

[0164] Method 4

[0165] Method 4 provides a method for controlling the transmission power of repeated PUSCH transmissions used for joint channel estimation when PUSCH repetition and frequency hopping are configured.

[0166] Figure 10 A method for setting the PUSCH transmission power for joint channel estimation is illustrated according to an embodiment when PUSCH repetition and frequency hopping are configured.

[0167] refer to Figure 10 If PUSCH repetition and frequency hopping are configured via higher-layer signaling and L1 signaling, the UE can perform time-frequency mapping for the first frequency hopping 1001 and the second frequency hopping 1002 to use the configured frequency hopping RB. offset 1003 Perform joint channel estimation. In this case, the UE can set P for the first frequency hopping 1001 using the received TPC command 1004. PUSCH (i0, j, q) d ,l) and set P for the second frequency hopping 1002 PUSCH (i1, j, q) d The UE can perform PUSCH transmission by using a frequency hopping method (l). In this case, the UE can repeat the PUSCH transmission based on the PUSCH transmission power set according to the frequency hopping configuration. Therefore, the base station can accurately perform joint channel estimation for the repetition of PUSCH transmission, obtain frequency diversity, and increase channel coverage.

[0168] exist Figure 10In this method, the same transmission power can be maintained between actual repetitions for joint channel estimation, and CLPC based on TPC commands can be applied to each actual repetition unit determined based on frequency hopping and to which joint channel estimation is to be performed. In this case, the same redundant version, precoding, modulation order, PRB, etc., can be set for the actual repetition set to which joint channel estimation is to be performed.

[0169] Furthermore, based on information configured by the base station, the UE can apply the same precoding, modulation order, PRB, etc., to the actual repetition set for which joint channel estimation is to be performed. The UE can apply the same redundant version to multiple PUSCH transmissions, for which joint channel estimation will be performed for symbol-based decoding (I / Q combination). Alternatively, the UE can map / assign the same redundant version to / assigned to multiple PUSCH transmissions, for which joint channel estimation will be performed for bit-based decoding (LLR combination), or can perform mapping / assignment based on a redundant version index configured by the base station. The base station can perform configuration to maintain phase continuity using the same modulation order and the same frequency location. Based on information configured by the base station, the UE can omit or limit additional uplink and downlink transmissions in the PUSCH transmissions for which joint channel estimation is to be performed.

[0170] Second Embodiment

[0171] A second embodiment of this disclosure provides a method for identifying phase continuity in repetitions of PUSCH transmissions for joint channel estimation of repetitions of PUSCH transmissions, and a method for controlling phase continuity in repetitions of PUSCH transmissions.

[0172] Figure 11 A discontinuous PUSCH repeating configuration according to an embodiment is shown.

[0173] refer to Figure 11 If PUSCH repetition type A 1101 and PUSCH repetition types B 1102 and 1103 are configured, PUSCH repetitions can be scheduled discontinuously. In this case, to determine whether joint channel estimation is allowed for PUSCH repetitions, it is necessary to identify the phase continuity of the discontinuously scheduled PUSCH repetitions. This embodiment provides a method for determining phase continuity using the interval L1 between scheduled discontinuous PUSCH repetitions.

[0174] Method 1

[0175] Method 1 is a method by which the base station determines phase continuity by comparing the interval between scheduled discontinuous PUSCH repetitions with the interval between DMRS of consecutive PUSCH repetitions.

[0176] Figure 12A A method for identifying phase continuity associated with discontinuous PUSCH repetitions, according to an embodiment, is illustrated.

[0177] refer to Figure 12A If PUSCH repetition type B is configured, the interval L1 between discontinuously scheduled PUSCH repetitions and the maximum interval L2 between consecutively scheduled PUSCH repetitions (DMRS) can be configured. In this case, since two invalid symbols are configured, L1=3 and L2=3 can be configured for actual repetition 1201. If L1≤L2, the base station can determine that actual repetitions #1 and #2 have phase continuity and can perform joint channel estimation. Since three invalid symbols are configured, L1=4 and L2=3 can be configured for actual repetition 1202. In this case, if L1>L2, the base station can determine that actual repetitions #1 and #2 do not have phase continuity and can not perform joint channel estimation.

[0178] Method 2

[0179] Method 2 is a method by which the base station determines phase continuity by comparing the interval between scheduled discontinuous PUSCH repetitions and the location where the DMRS is mapped.

[0180] Here, if PUSCH repeat type B is configured via higher-layer signaling, and... Figure 12B If pos1 is set to dmrs-AdditionnalPosition, then the interval between discontinuous PUSCH repetitions and the interval based on... Figure 12B The DMRS mapping position of the value of pos1 (marked by dashed line 1210) configured via higher-layer signaling determines the phase continuity of PUSCH repetitions. For example, if the interval between discontinuous PUSCH repetitions is greater than the set value of pos1, the base station can determine that the discontinuous PUSCH repetitions do not have phase continuity and can not perform joint channel estimation. Alternatively, if the interval between discontinuous PUSCH repetitions is less than or equal to the set value of pos1, the base station can determine that the discontinuous PUSCH repetitions have phase continuity and can perform joint channel estimation.

[0181] Therefore, the base station determines whether discontinuous PUSCH repetitions have phase continuity, and if phase continuity is identified, it performs joint channel estimation on the repetitions of PUSCH transmissions. Thus, accurate channel estimation can be performed, and channel coverage can be increased.

[0182] In the second embodiment, methods 1 and 2 for determining phase continuity for joint channel estimation can be satisfied based on the following conditions. The base station can predetermine whether to apply the same modulation order, beam information, or precoding to the PUSCH transmission over which joint channel estimation is to be performed, and can additionally determine phase continuity by considering downlink and uplink transmissions in the PUSCH transmission over which joint channel estimation is to be performed. Furthermore, based on information configured by the base station, for the PUSCH transmission over which joint channel estimation is to be performed, the UE can apply the same modulation order, beam configuration, transmission power, frequency position, or the same number of RBs to the portion over which joint channel estimation is to be performed. Additionally, the UE can omit or limit downlink transmissions and additional uplink transmissions in the portion over which joint channel estimation is performed.

[0183] Third Embodiment

[0184] A third embodiment of this disclosure can provide a method for configuring beams for repeated joint channel estimation of PUSCH transmissions.

[0185] Figure 13 A beam configuration based on a PUSCH repetition configuration that takes into account multiple transmit and receive points (TRPs) is shown according to an embodiment.

[0186] refer to Figure 13 When PUSCH repetition considering multiple TRPs is configured, cyclic mapping 1301 and sequential mapping 1302 can be configured via higher-layer signaling and L1 signaling. If joint channel estimation for repetition of PUSCH transmissions is configured via higher-layer signaling and L1 signaling, the same beam must be configured for the repetition of PUSCH transmissions for which joint channel estimation is to be performed. That is, joint channel estimation is only allowed if PUSCHs are repetitively transmitted via the same beam.

[0187] In the following embodiments, an example is provided to provide a method for repeatedly performing joint channel estimation for PUSCH transmissions that take into account multiple TRPs.

[0188] Method 1

[0189] Method 1 is a method for performing joint channel estimation on the repetition of PUSCH transmissions only when the order mapping method is configured for the repetition of PUSCH transmissions considering multiple TRPs.

[0190] In this scenario, the base station can perform joint channel estimation on repeated PUSCH transmissions that consider multiple TRPs without performing additional operations, thereby improving channel estimation performance and increasing channel coverage.

[0191] Method 2

[0192] Method 2 is a method for configuring beams for repeated PUSCH transmissions when a cyclic mapping method is configured for repeated PUSCH transmissions considering multiple TRPs and variables for joint channel estimation are configured.

[0193] Figure 14 A beam configuration method using variables and cyclic mapping for joint channel estimation is illustrated according to an embodiment when repeating PUSCH transmissions that take into account multiple TRPs is performed.

[0194] refer to Figure 14 If a UE is configured with PUSCH repetitions that consider multiple TRPs and joint channel estimation is configured, beam mapping can be performed using the variables configured for the joint channel estimation. For example, if for a UE, the variables used for joint channel estimation are configured with two actual repetitions 1401 via higher-layer signaling and L1 signaling, the UE can treat these two actual repetitions as a single actual repetition set, configure the same beam for this actual repetition set, and perform cyclic beam mapping based on this actual repetition set. Alternatively, when the variables used for joint channel estimation are configured with a threshold 1402 for the interval between repetitions of PUSCH transmissions via higher-layer signaling and L1 signaling, if the interval between repetitions of PUSCH transmissions is greater than the threshold, the UE can configure different beams for each repetition of PUSCH transmissions, and perform cyclic beam mapping based on this. In the above description, the variables configured for joint channel estimation via higher-layer signaling and L1 signaling are merely examples, and this disclosure is not limited thereto. For example, at least one of the symbol / slot length and the number of nominal / actual repetitions can be configured as variables via higher-layer signaling and L1 signaling. Furthermore, this can be applied using one of them or a combination thereof. The UE can perform beam mapping by considering multiple TRPs and joint channel estimation, thus enabling accurate channel estimation and achieving macro-diversity gain.

[0195] Method 3

[0196] Method 3 provides a method for mapping beams that take into account PUSCH repetitions of multiple TRPs, and a method for performing joint channel estimation on the PUSCH when frequency hopping is configured.

[0197] Figure 15 A method for configuring frequency hopping when repeating PUSCH transmissions that take into account multiple TRPs is performed, according to an embodiment, is shown, as well as a beam configuration method using variables for joint channel estimation.

[0198] refer to Figure 15When a PUSCH transmission considering multiple TRPs is performed, frequency hopping is applied to each beam to obtain frequency diversity for each TRP, and the beam can be mapped based on variables 1501 configured via higher-layer signaling and L1 signaling for joint channel estimation. The following equation (5) is used for frequency mapping for each TRP.

[0199]

[0200] like Figure 15 As shown, frequency hopping can be applied to SRI#0 and SRI#1 respectively. In the above description, the variables configured for joint channel estimation via higher-layer signaling and L1 signaling are merely examples, and this disclosure is not limited thereto. For example, at least one of the symbol / slot length and the number of nominal repetitions / actual repetitions can be configured as variables via higher-layer signaling and L1 signaling. Furthermore, the above methods can be applied by using one of them or a combination thereof. The UE can perform frequency beam mapping by considering multiple TRPs and joint channel estimation, thus enabling accurate channel estimation and obtaining macro-diversity gain and frequency diversity gain.

[0201] Fourth embodiment

[0202] The fourth embodiment of this disclosure can provide a method for controlling the repetition of PUSCH transmissions through joint channel estimation.

[0203] Figure 16 The operation of a base station for repeated joint channel estimation of PUSCH transmissions according to an embodiment is illustrated.

[0204] In step 1601, the base station may transmit at least one of the following via higher-layer signaling or L1 signaling: information associated with PUSCH repetition, information associated with frequency hopping, and configuration information associated with joint channel estimation (e.g., joint channel estimation enable / disable information, the number of PUSCH repetitions allowed for joint channel estimation, etc.). Subsequently, in step 1602, the base station may transmit downlink symbol configuration information and invalid symbol information based on an invalid symbol pattern via higher-layer signaling (TDD configuration) or L1 signaling (slot format indicator). In step 1603, the base station may determine the PUSCH to be actually transmitted based on the nominal repetition configuration and the slot boundaries of the configured PUSCH resources in the time domain, and in step 1604, it may determine the transmission power consistency and phase continuity of the actual repetitions of the PUSCH transmissions for which joint channel estimation is to be performed based on the configuration information associated with joint channel estimation. The base station may configure the same beam for the actual repetitions of the PUSCH transmissions for which joint channel estimation is to be performed, and frequency hopping may be configured based on a frequency hopping interval pattern. Therefore, in step 1605, the PUSCH resources in which the UE will actually perform transmissions can be identified. In step 1606, the base station can repeatedly receive actual PUSCHs in the PUSCH resources where transmissions have actually been performed. Subsequently, in step 1607, based on configuration information associated with joint channel estimation, the base station can repeatedly perform joint channel estimation on the actually received PUSCHs.

[0205] Figure 16 Some of steps 1601 to 1607 can be omitted or can be executed in parallel. Figure 16 The order of the steps executed in the process can be changed.

[0206] Figure 17 The operation of a UE configured with repeated joint channel estimation for PUSCH transmissions according to an embodiment is illustrated.

[0207] In step 1701, the UE may receive at least one of the following via higher-layer signaling or L1 signaling: information associated with PUSCH repetition, information associated with frequency hopping, and configuration information associated with joint channel estimation (e.g., joint channel estimation enable / disable information, the number of repetitions of PUSCH transmissions for which joint channel estimation is allowed). Subsequently, in step 1702, the UE may receive downlink symbol configuration information and invalid symbol information based on invalid symbol patterns via higher-layer signaling (TDD configuration) or L1 signaling (slot format indicator). Furthermore, in step 1703, the UE may determine the PUSCH to be actually transmitted based on the nominal repetition configuration and the slot boundaries of the configured PUSCH resources in the time domain, and may determine the actual repetition of the PUSCH for which joint channel estimation is to be performed based on the configured configuration information associated with joint channel estimation. In step 1704, the transmission power of the actual repetition of the PUSCH transmission for which joint channel estimation is to be performed can be determined (or identified). In this scenario, the UE can use the same PUSCH transmission power to perform actual repetition of the PUSCH transmissions for which joint channel estimation is to be performed. Furthermore, in step 1705, the UE can configure the same beam for the actual repetition of the PUSCH transmissions for which joint channel estimation is to be performed, and can configure frequency hopping based on the frequency hopping interval pattern. Subsequently, in step 1706, within the PUSCH resources for which actual transmissions are to be performed, the UE can repeatedly transmit the actual PUSCHs used for joint channel estimation.

[0208] Figure 17 Some of steps 1701 to 1706 can be omitted or can be performed in parallel. Figure 17 The order of the steps executed in the process can be changed.

[0209] The base station may need to send configuration information to the UE for repeated joint channel estimation of PUSCH transmissions. In this case, considering the base station's capability for joint channel estimation, the base station may indicate the configuration information associated with the joint channel estimation to the UE. The method by which the base station configures the joint channel estimation can be determined using one or a combination of the following methods.

[0210] Method 1

[0211] To perform joint channel estimation on repeated PUSCH transmissions, the base station can operate by setting time slots, nominal repetitions, actual repetitions, and the number of available symbols as variables. In this case, the UE can use the set variables to determine the repetition of PUSCH transmissions for which joint channel estimation is to be performed as a single PUSCH repetition set. Therefore, the UE can set the same PUSCH transmission power, beam, frequency hopping, and PUSCH timing relative to the PUSCH repetition set for which joint channel estimation is to be performed, and can perform the transmission.

[0212] Method 2

[0213] For joint channel estimation of repeated PUSCH transmissions, the base station can set a threshold for the interval between discontinuous PUSCH repetitions and perform joint channel estimation. In this case, if the interval between discontinuous PUSCH repetitions is identified as less than the set threshold, the UE can perform PUSCH transmission repetition based on the joint channel estimation configuration information. In this case, the UE can set the same PUSCH transmission power, beam, frequency hopping, and PUSCH timing for the discontinuous PUSCH repetitions for which joint channel estimation is to be performed, and can perform transmission. Unlike the above, if the interval between discontinuous PUSCH repetitions is greater than the set threshold, the base station can determine that joint channel estimation for discontinuous PUSCH repetitions is not allowed.

[0214] Method 3

[0215] To perform frequency hopping and joint channel estimation for repeated PUSCH transmissions, the base station can allocate time-frequency resources to the UE via a bitmap. In this case, the bitmap can set the frequency hopping positions for actual or nominal repetitions. Furthermore, joint channel estimation can be performed for continuous / discontinuous PUSCH repetitions with phase continuity. The UE can set the same PUSCH transmission power, beam, frequency hopping, and PUSCH timing for the set of PUSCH repetitions for which joint channel estimation is to be performed, and can then perform the transmission.

[0216] The base station can configure repeated joint channel estimation for PUSCH transmissions using methods that control joint channel estimation. Furthermore, the base station can use one or a combination of the methods described to control joint channel estimation.

[0217] Figure 18 The structure of the UE according to an embodiment is shown.

[0218] refer to Figure 18UE 1800 may include a transceiver 1801, a controller (processor) 1802, and a memory 1803. The transceiver 1801, controller 1802, and memory 1803 of UE 1800 can operate according to an efficient channel and signal transmission or reception method in a 5G communication system corresponding to the above embodiments. The components of UE 1800 are not limited to the examples described above, and UE 1800 may include more or fewer components than those described. Furthermore, the transceiver 1801, controller 1802, and memory 1803 may be implemented as a single chip.

[0219] Transceiver 1801 may include a transmitter and a receiver. Transceiver 1801 can perform signal transmission or reception with a base station. Signals may include control information and data. For this purpose, transceiver 1801 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that amplifies the received signal with low noise and down-converts the frequency of the signal, etc. Furthermore, transceiver 1801 can receive signals via a wireless channel and output them to controller 1802, and can also transmit signals output from controller 1802 via a wireless channel.

[0220] Controller 1802 can control a series of processes in the operation of UE 1800. For example, considering a method of estimating the channel by simultaneously using DMRS transmitted from multiple PUSCHs, controller 1802 can execute a method of changing the position of the OFDM symbol of the DMRS. For this purpose, controller 1802 may include at least one processor. For example, controller 1802 may include a communication processor (CP) that performs communication control, and a higher-level application processor (AP) that controls applications, etc.

[0221] The memory 1803 may store control information or data, such as information related to channel estimation using DMRS transmitted from PUSCH included in the signal obtained from the UE 1800, and may have areas for storing data required by the control controller 1802, data generated when the controller 1802 performs control, etc.

[0222] Figure 19 The structure of a base station according to an embodiment is shown.

[0223] refer to Figure 19The base station 1900 may include a transceiver 1901, a controller (processor) 1902, and a memory 1903. The transceiver 1901, controller 1902, and memory 1903 of the base station 1900 can operate according to an efficient channel and signal transmission or reception method in a 5G communication system corresponding to the above embodiments. The components of the base station 1900 are not limited to the examples described above, and the base station 1900 may include more or fewer components than those described. Furthermore, the transceiver 1901, controller 1902, and memory 1903 may be implemented as a single chip.

[0224] Transceiver 1901 may include a transmitter and a receiver. Transceiver 1901 can perform signal transmission or reception with the UE. Signals may include control information and data. For this purpose, transceiver 1901 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that amplifies the received signal with low noise and down-converts the frequency of the signal, etc. Furthermore, transceiver 1901 can receive signals via a wireless channel, output them to controller 1902, and transmit signals output from controller 1902 via a wireless channel.

[0225] Controller 1902 can control a series of processes for operating base station 1900. For example, considering a method of estimating the channel using DMRS transmitted from PUSCH, controller 1902 can execute a method of changing the position of the OFDM symbol of the DMRS. For this purpose, controller 1902 may include at least one processor. For example, controller 1902 may include a CP that performs communication control and a higher-level AP that controls applications such as applications.

[0226] The memory 1903 may store control information or data, such as information related to channel estimation using DMRS transmitted from PUSCH determined by the base station 1900, or control information or data received from the UE, and may have areas for storing data required by the control controller 1902 and data generated when the controller 1902 performs control.

[0227] In this document, it should be understood that each block of the flowchart illustration, and combinations of blocks in the flowchart illustration, can be implemented by a computer program instruction provided to a processor of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus to generate a machine tool, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create components for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable storage medium that can instruct the computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-usable or computer-readable storage medium produce an article of manufacture including instruction components that implement the functions specified in one or more flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus, thereby producing a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowchart blocks.

[0228] Each box in a flowchart can represent a module, code segment, or code section, which includes one or more executable instructions for implementing a specified logical function(s). It should also be noted that in some alternative implementations, the functions mentioned in the boxes may occur out of order. For example, two boxes shown consecutively may actually execute substantially simultaneously, or these boxes may sometimes execute in reverse order, depending on the functions involved.

[0229] As used herein, a unit refers to a software or hardware element that performs a predetermined function, such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). However, a unit does not always have the meaning of being limited to software or hardware. A unit can be configured to be stored in addressable storage media or to execute one or more processors. Therefore, a unit includes software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a unit can be combined into a smaller number of elements or units, or divided into a larger number of elements or units. Furthermore, elements and units can be implemented as replicas of one or more CPUs within a device or secure multimedia card. A unit in an embodiment may include one or more processors.

[0230] Although this disclosure has been described with reference to various embodiments, various changes may be made without departing from the spirit and scope of this disclosure, which is not limited by the specific implementation and embodiments, but by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment (UE) in a communication system, the method comprising: The configuration of repeated Physical Uplink Shared Channel (PUSCH) received via higher-layer signaling; Receive downlink control information (DCI) including the time-domain resource allocation (TDRA) field on the physical downlink control channel (PDCCH); Based on the configuration and TDRA fields, identify multiple time resources used for PUSCH repetition; Identify whether predefined conditions are met; and If predefined conditions are met, PUSCH repetitions are sent on the plurality of time resources while maintaining power consistency for PUSCH repetitions. The predefined conditions include a first predefined condition, which corresponds to the gap between two PUSCH transmissions in a PUSCH repeat being less than a gap threshold.

2. The method according to claim 1, wherein, The predefined conditions include a second predefined condition, which corresponds to the fact that frequency hopping is not configured for PUSCH repetition.

3. The method according to claim 1, wherein, The predefined conditions include a third predefined condition, which corresponds to different uplink beams not being configured for two consecutive PUSCH transmissions in a PUSCH repetition, and Each of the different uplink beams is associated with a sounding reference signal (SRS) resource.

4. The method according to claim 1, wherein, If at least one of the predefined conditions is not met, power consistency of at least two PUSCH transmissions in a cross-PUSCH repeat is not maintained.

5. The method according to claim 1, wherein, With the power consistency of PUSCH repetition maintained, the phase continuity of PUSCH repetition is also maintained.

6. The method according to claim 1, wherein, PUSCH repeat is configured as either PUSCH repeat type A or PUSCH repeat type B.

7. A user equipment (UE) in a communication system, the UE comprising: transceiver; and The processor, coupled to the transceiver, is configured to: The configuration of repeated Physical Uplink Shared Channel (PUSCH) received via higher-layer signaling; Receive downlink control information (DCI) including the time-domain resource allocation (TDRA) field on the physical downlink control channel (PDCCH); Based on the configuration and TDRA fields, identify multiple time resources used for PUSCH repetition; Identify whether predefined conditions are met; and If predefined conditions are met, PUSCH repetitions are sent on the plurality of time resources while maintaining power consistency for PUSCH repetitions. The predefined conditions include a first predefined condition, which corresponds to the gap between two PUSCH transmissions in a PUSCH repeat being less than a gap threshold.

8. The UE according to claim 7, wherein, The predefined conditions include a second predefined condition, which corresponds to the fact that frequency hopping is not configured for PUSCH repetition.

9. The UE according to claim 7, wherein, The predefined conditions include a third predefined condition, which corresponds to different uplink beams not being configured for two consecutive PUSCH transmissions in a PUSCH repetition, and Each of the different uplink beams is associated with a sounding reference signal (SRS) resource.

10. The UE according to claim 7, wherein, If at least one of the predefined conditions is not met, power consistency of at least two PUSCH transmissions in a cross-PUSCH repeat is not maintained.

11. The UE according to claim 7, wherein, With the power consistency of PUSCH repetition maintained, the phase continuity of PUSCH repetition is also maintained.

12. The UE according to claim 7, wherein, PUSCH repeat is configured as either PUSCH repeat type A or PUSCH repeat type B.

13. A method performed by a base station in a communication system, the method comprising: The configuration of the Physical Uplink Shared Channel (PUSCH) is repeated via higher-layer signaling; Downlink control information (DCI), including the Time Domain Resource Allocation (TDRA) field, is transmitted on the Physical Downlink Control Channel (PDCCH); and Receive PUSCH repetitions on multiple time resources; The multiple time resources mentioned herein are associated with the configuration and TDRA fields. Specifically, if predefined conditions are met, PUSCH repetition is accepted while the power consistency of PUSCH repetition is maintained. The predefined conditions include a first predefined condition, which corresponds to the gap between two PUSCH transmissions in a PUSCH repeat being less than a gap threshold.

14. The method according to claim 13, wherein, The predefined conditions include a second predefined condition, which corresponds to the fact that frequency hopping is not configured for PUSCH repetition.

15. The method according to claim 13, wherein, The predefined conditions include a third predefined condition, which corresponds to different uplink beams not being configured for two consecutive PUSCH transmissions in a PUSCH repetition, and Each of the different uplink beams is associated with a sounding reference signal (SRS) resource.

16. The method according to claim 13, wherein, If at least one of the predefined conditions is not met, power consistency of at least two PUSCH transmissions in a cross-PUSCH repeat is not maintained.

17. A base station in a communication system, the base station comprising: transceiver; and The processor, coupled to the transceiver, is configured to: The configuration of the Physical Uplink Shared Channel (PUSCH) is repeated via higher-layer signaling; Downlink control information (DCI), including the Time Domain Resource Allocation (TDRA) field, is transmitted on the Physical Downlink Control Channel (PDCCH); and Receive PUSCH repetitions on multiple time resources; The multiple time resources mentioned herein are associated with the configuration and TDRA fields. Specifically, if predefined conditions are met, PUSCH repetition is accepted while the power consistency of PUSCH repetition is maintained. The predefined conditions include a first predefined condition, which corresponds to the gap between two PUSCH transmissions in a PUSCH repeat being less than a gap threshold.

18. The base station according to claim 17, wherein, The predefined conditions include a second predefined condition, which corresponds to the fact that frequency hopping is not configured for PUSCH repetition.

19. The base station according to claim 17, wherein, The predefined conditions include a third predefined condition, which corresponds to different uplink beams not being configured for two consecutive PUSCH transmissions in a PUSCH repetition, and Each of the different uplink beams is associated with a sounding reference signal (SRS) resource.

20. The base station according to claim 17, wherein, If at least one of the predefined conditions is not met, power consistency of at least two PUSCH transmissions in a cross-PUSCH repeat is not maintained.

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