Method and apparatus for transmitting and receiving using configuration authorization in wireless communication system

Abstract

The present disclosure relates to a 5th-Generation (5G) or 6th-Generation (6G) communication system for supporting higher data transmission rates. A method performed by a terminal in a wireless communication system is provided. The method includes receiving configuration information associated with a set of a plurality of downlink resources from a base station, the set being configured to occur periodically, monitoring the plurality of downlink resources of the set in a period for receiving downlink data, where the plurality of downlink resources are sequentially monitored, and transmitting the downlink data to the base station. And skipping monitoring of the remaining one or more downlink resources of the set in the period if downlink data is received in the downlink resources of the set in the period.

Description

Technical Field

[0001] The present disclosure relates to wireless communication systems. More particularly, the present disclosure relates to methods and apparatus for transmitting and receiving using configuration authorization in wireless communication systems. Background Art

[0002] The fifth generation (5G) mobile communication technology defines a wide frequency band, making high transmission rates and new services possible, and can be implemented not only in "less than 6 gigahertz (GHz)" frequency bands such as 3.5 GHz, but also in "above 6 GHz" frequency bands called millimeter waves (mmWave) including 28 GHz and 39 GHz. In addition, the implementation of the sixth generation (6G) mobile communication technology (referred to as a super 5G system) in the terahertz (THz) frequency band (e.g., 95 GHz to 3 THz frequency band) has been considered to achieve a transmission rate fifty times faster than that of the 5G mobile communication technology and an ultra-low latency one-tenth of that of the 5G mobile communication technology.

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet performance requirements related to enhanced mobile broadband (eMBB), ultra-reliable low latency communication (URLLC) and massive machine type communication (mMTC), there is ongoing standardization on the following items: beamforming and massive multiple-input multiple-output (MIMO) for mitigating radio wave path loss and increasing radio wave transmission distance in millimeter wave (mmWave), parameter sets supporting dynamic operations for efficient utilization of millimeter wave resources and time slot formats (such as operating multiple subcarrier spacings), initial access technology for supporting multi-beam transmission and broadband, definition and operation of bandwidth parts (BWP), new channel coding methods (such as low-density parity check (LDPC) codes for large-scale data transmission and polar codes for highly reliable transmission of control information), L2 preprocessing, and network slicing for providing dedicated networks dedicated to specific services.

[0004] Currently, in view of the services to be supported by 5G mobile communication technology, discussions are ongoing on improvements and performance enhancements of initial 5G mobile communication technology, and there is already physical layer standardization on technologies such as: Vehicle-to-Everything (V2X), for assisting driving determination of autonomous vehicles based on information about the location and status of the vehicle sent by the vehicle and for enhancing user convenience; New Radio Unlicensed (NR-U), designed to comply with various regulatory-related requirements of system operation in unlicensed bands; NR User Equipment (NR UE) power saving; Non-Terrestrial Network (NTN), which is UE satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable; and positioning.

[0005] In addition, there is ongoing standardization in the air interface architecture / protocol on technologies such as: Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, Integrated Access and Backhaul (IAB) for providing nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner, mobility enhancements including conditional switching and dual active protocol stack (DAPS) switching, and two-step RA channel (RACH) for simplifying the RA process. There is also ongoing standardization on 5G service-based architecture or service-based interface for combining network function virtualization (NFV) and software defined network (SDN) technologies and system architecture / service for mobile edge computing (MEC) for receiving services based on UE location.

[0006] With the commercialization of 5G mobile communication systems, the already exponentially growing number of connected devices will be connected to the communication network, and it is accordingly expected that enhanced functions and performance of the 5G mobile communication system and integrated operations of the connected devices will be necessary. To this end, new research related to extended reality (XR) is arranged to effectively support augmented reality (AR), virtual reality (VR), mixed reality (MR), etc., improve 5G performance and reduce complexity by utilizing artificial intelligence (AI) and machine learning (ML), AI service support, meta-service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a foundation for developing not only new waveforms for providing coverage in the terahertz band for 6G mobile communication technology, multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional spatial multiplexing technology using orbital angular momentum (OAM), and reconfigurable smart surfaces (RIS), but also full-duplex technology for improving the frequency efficiency of 6G mobile communication technology and improving system networks, AI-based communication technology for achieving system optimization by leveraging satellites and AI from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for achieving services at a complexity level that exceeds the limits of UE operating capabilities by utilizing ultra-high performance communication and computing resources.

[0008] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0009] Solution to the problem

[0010] The present disclosure relates to methods and apparatus for transmitting and receiving using configuration authorization in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0012] Figure 1 A set of downlink resources configured to occur periodically according to an embodiment of the present disclosure is shown;

[0013] Figure 2 A flowchart describing a method performed by a base station according to an embodiment of the present disclosure is shown;

[0014] Figure 3 A flowchart describing a method performed by a terminal according to an embodiment of the present disclosure is shown;

[0015] Figure 4 shows a downlink assignment configuration belonging to the same group according to an embodiment of the present disclosure;

[0016] Figure 5 A downlink resource set configured to appear periodically through a signal from a base station according to an embodiment of the present disclosure is shown;

[0017] Figure 6 illustrates packet arrival and timing of downlink resources related to transmission of packets according to an embodiment of the present disclosure;

[0018] Figure 7 An example of physical downlink control channel (PDCCH) monitoring in an inactive state prior to DL semi-persistent scheduling (SPS) resources according to an embodiment of the present disclosure is shown;

[0019] Figure 8 Another example of PDCCH monitoring in an inactive state before DL SPS resources according to an embodiment of the present disclosure is shown;

[0020] Fig. 9 An example of inactive PDCCH monitoring before and after DL SPS resources according to an embodiment of the present disclosure is shown;

[0021] Fig.10 An example of inactive PDCCH monitoring before and after DL SPS resources according to an embodiment of the present disclosure is shown;

[0022] Fig.11 An example of PDCCH monitoring in an inactive state according to an embodiment of the present disclosure is shown;

[0023] Fig.12 Another example of PDCCH monitoring in an inactive state according to an embodiment of the present disclosure is shown;

[0024] Fig.13 shows monitoring of the PDCCH during inactive time according to an embodiment of the present disclosure;

[0025] Fig.14 shows a set of uplink (UL) resources configured to occur periodically according to an embodiment of the present disclosure;

[0026] Fig.15 A flowchart describing a method performed by a terminal according to an embodiment of the present disclosure is shown;

[0027] Fig.16 A flowchart describing a method performed by a base station according to an embodiment of the present disclosure is shown;

[0028] Fig.17 An example of uplink assignment configuration belonging to the same group according to an embodiment of the present disclosure is shown;

[0029] Fig.18 An uplink resource set configured to appear periodically through a signal from a base station according to an embodiment of the present disclosure is shown;

[0030] Fig.19 is a diagram illustrating a UE 1900 according to an embodiment of the present disclosure; and

[0031] Fig. 20 is a diagram showing a base station 2000 according to an embodiment of the present disclosure.

[0032] Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. DETAILED DESCRIPTION

[0033] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these details are considered to be exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0034] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0035] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0036] Throughout the present disclosure, the expression "at least one of a, b or c" indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b and c, or variations thereof. Throughout the specification, a layer (or layer arrangement) may also be referred to as an entity. Hereinafter, the operating principle of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or configurations are not described in detail because they will obscure the present disclosure with unnecessary details. The terms used in the specification are defined in consideration of the functions used in the present disclosure and may change according to the intention or common methods of the user or operator. Therefore, the definition of the terms is understood based on the entire description of the present disclosure.

[0037] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or roughly shown. In addition, the size of each element does not completely correspond to the actual size of each element. In each of the accompanying drawings, the same reference numerals are used to mark the same or corresponding elements.

[0038] By referring to the following detailed description of the embodiments and drawings of the present disclosure, the advantages and features of the present disclosure and the methods for realizing the same can be more easily understood. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to the embodiments set forth herein; on the contrary, these embodiments of the present disclosure are provided so that the present disclosure will be thorough and complete, and the concepts of the present disclosure will be fully conveyed to those of ordinary skill in the art. Therefore, the scope of the present disclosure is defined by the appended claims. Throughout the specification, the same reference numerals represent the same elements. It should be understood that the combination of the blocks in the flowchart or the flowchart can be executed by computer program instructions. Because these computer program instructions can be loaded into a processor of a general-purpose computer, a special-purpose computer, or another programmable data processing device, the instructions executed by the processor of the computer or another programmable data processing device create units for performing the functions described in the flowchart blocks.

[0039] The computer program instructions may be stored in a non-transitory computer-usable or computer-readable memory capable of instructing a computer or another programmable data processing apparatus to implement functions in a specific manner, and thus the instructions stored in the computer-usable or computer-readable memory may also be capable of producing an article of manufacture containing instruction units for performing the functions described in the flowchart blocks. The computer program instructions may also be loaded into a computer or another programmable data processing apparatus, and thus, when a series of operations are performed in the computer or another programmable data processing apparatus, the instructions for operating the computer or another programmable data processing apparatus by generating a computer-implemented process may provide operations for performing the functions described in the flowchart blocks.

[0040] In addition, each box may represent a module, segment or part of a code including one or more executable instructions for performing a specified logical function. It should also be noted that in some alternative implementations, the functions mentioned in the box may not appear in order. For example, two consecutive blocks are also executed simultaneously or in reverse order according to the functions corresponding thereto.

[0041] As used herein, the term "unit" represents a software element or a hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and performs a specific function. However, the term "unit" is not limited to software or hardware. A "unit" can be formed to be in an addressable storage medium, or can be formed to operate one or more processors. Therefore, for example, the term "unit" includes an element (e.g., a software element, an object-oriented software element, a class element, and a task element), a process, a function, an attribute, a procedure, a subroutine, a program code segment, a driver, a firmware, a microcode, a circuit, data, a database, a data structure, a table, an array, or a variable.

[0042] The functions provided by the elements and "units" can be combined into a smaller number of elements and "units", or can be separated into additional elements and "units". In addition, the elements and "units" can be implemented as one or more central processing units (CPUs) in a reproduction device or a secure multimedia card. In addition, in an embodiment of the present disclosure, a "unit" may include at least one processor. In the following description of the present disclosure, well-known functions or configurations are not described in detail because they will obscure the present disclosure with unnecessary details.

[0043] Hereinafter, for convenience of explanation, the present disclosure uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to the terms and names and may also be applied to systems complying with other standards.

[0044] In the present disclosure, for the convenience of explanation, the evolved Node B (eNB) may be used interchangeably with the next generation Node B (gNB). That is, the base station (BS) described by the eNB may represent the gNB. In the following description, the term "base station" refers to an entity for allocating resources to a user equipment (UE), and may be used interchangeably with at least one of a gNode B, an eNode B, a node B, a base station (BS), a radio access unit, a base station controller (BSC), or a node on a network. The term "terminal" may be used interchangeably with a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. However, the present disclosure is not limited to the foregoing examples. In particular, the present disclosure is applicable to the 3GPP New Radio (NR) (or fifth generation (5G)) mobile communication standard. In the following description, for the convenience of explanation, the term eNB may be used interchangeably with the term gNB. That is, a base station described as an eNB may also indicate a gNB. The term UE may also indicate a mobile phone, a NB-IoT device, a sensor, and other wireless communication devices.

[0045] The present disclosure relates to a wireless communication system, and more particularly to a method and system for discontinuous reception in a connected state.

[0046] In order to meet the demand for wireless data services that has increased since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved 5G or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also called "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (mmWave) bands (such as the 60GHz band) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (RANs) ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference elimination, etc. In 5G systems, hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coded modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0047] The Internet, a human-centered connected network in which humans generate and consume information, 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), which is a combination of IoT technology and big data processing technology through connection with cloud servers, has emerged. Since IoT implementation requires technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology", sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied recently. Such an IoT environment can provide smart Internet technology services that create new value for human life by collecting and analyzing data generated between connected things. Through the integration and combination between existing information technology (IT) and various industrial applications, IoT can be applied to various fields including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services.

[0048] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. The application of cloud radio access networks (RANs) as the above-mentioned big data processing technology can also be considered as an example of the fusion between 5G technology and IoT technology.

[0049] Carrier aggregation (CA) / multiple connections in the fifth generation wireless communication system: The fifth generation wireless communication system supports independent operation mode as well as dual connection (DC). In DC, multiple receive (Rx) / transmit (Tx) UEs can be configured to utilize resources provided by two different nodes (or NBs) connected via a non-ideal backhaul. One node acts as a master node (MN) and the other node acts as a secondary node (SN). The MN and the SN are connected via a network interface, and at least the MN is connected to the core network (CN). NR also supports multi-RAT dual connection (MR-DC) operation, whereby a UE in RRC_CONNECTED is configured to utilize radio resources provided by two different schedulers, which are located in two different nodes connected via a non-ideal backhaul and provide an evolved universal terrestrial radio access network (E-UTRA) (ie, if the node is an ng-eNB) or NR access (ie, if the node is a gNB). In NR, for a UE in RRC_CONNECTED that is not configured with CA / DC, there is only one serving cell including a primary cell. For a UE in RRC_CONNECTED configured with CA / DC, the term "serving cell" is used to refer to a set of cells including special cells and all secondary cells. In NR, the term master cell group (MCG) refers to a set of serving cells associated with a master node, including a PCell and optionally one or more SCells. In NR, the term secondary cell group (SCG) refers to a set of serving cells associated with a secondary node, including a PSCell and optionally one or more SCells. In NR, PCell (primary cell) refers to a serving cell in an MCG operating on a primary frequency, in which the UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure. In NR for a UE configured with CA, an Scell ​​is a cell that provides additional radio resources on top of a special cell. A primary SCG cell (PSCell) refers to a serving cell in an SCG, in which the UE performs random access when performing reconfiguration using a Sync procedure. For dual-connectivity operation, the term SpCell (i.e., special cell) refers to a PCell of an MCG or a PSCell of an SCG, otherwise the term special cell refers to a PCell.

[0050] Random access in the fifth generation wireless communication system: In the 5G wireless communication system, random access (RA) is supported. Random access (RA) is used to achieve uplink (UL) time synchronization. RA is used by non-synchronized UEs in the RRC connected state during initial access, handover, radio resource control (RRC) connection re-establishment process, scheduling request transmission, secondary cell group (SCG) addition / modification, beam failure recovery, and data or control information transmission in the UL. Several types of random access procedures are supported, such as contention-based random access, contention-free random access, and each of these can be a 2-step or 4-step random access.

[0051] BWP operation in the fifth generation wireless communication system: In the fifth generation wireless communication system, bandwidth adaptation (BA) is supported. With BA, the reception and transmission bandwidth of the UE does not need to be as large as the bandwidth of the cell and can be adjusted: the width can be commanded to change (for example, shrink during low activity periods to save power); the position can be moved in the frequency domain (for example, to increase scheduling flexibility); and the subcarrier spacing can be commanded to change (for example, to allow different services). A subset of the total cell bandwidth of a cell is called a bandwidth part (BWP). BA is implemented by configuring an RRC-connected UE with a BWP and informing the UE which of the configured BWPs is currently the active BWP. When BA is configured, the UE only has to monitor the PDCCH on one active BWP, that is, it does not have to monitor the PDCCH on the entire DL frequency of the serving cell. In the RRC connected state, the UE is configured with one or more DL and UL BWPs for each configured serving cell (i.e., PCell or SCell). For an activated serving cell, there is always one active UL and DL BWP at any point in time. BWP switching of the serving cell is used to activate an inactive BWP and deactivate an active BWP at one time. BWP switching is controlled by PDCCH indicating downlink assignment or uplink grant, bwp-InactivityTimer, RRC signaling, or the medium access control (MAC) entity itself when initiating a random access procedure. After adding a SpCell or activating an SCell, the DL BWP and UL BWP indicated by firstActiveDownlinkBWP-Id and firstActiveUplinkBWP-Id, respectively, are active without receiving a PDCCH indicating a downlink assignment or uplink grant. The active BWP of the serving cell is indicated by RRC or PDCCH. For unpaired spectrum, the DL BWP is paired with the UL BWP, and BWP switching is common for both UL and DL. After the BWP inactivity timer expires, the UE switches the active DL BWP to the default DL BWP or the initial DL BWP (if the default DL BWP is not configured).

[0052] RRC states in fifth generation wireless communication systems: In fifth generation wireless communication systems, RRC can be in one of the following states: RRC_IDLE, RRC_INACTIVE and RRC_CONNECTED. When an RRC connection has been established, the UE is in the RRC_CONNECTED state or the RRC_INACTIVE state. If this is not the case, i.e., no RRC connection has been established, the UE is in the RRC_IDLE state. The RRC state can be further characterized as follows:

[0053] In RRC_IDLE, UE-specific discontinuous reception (DRX) can be configured by upper layers. The UE monitors short messages sent with the Paging Radio Network Temporary Identifier (P-RNTI) on the Downlink Control Information (DCI); monitors the paging channel for CN paging using the 5G-S-Temporary Mobile Subscriber Identity (5G-S-TMSI); performs neighbor cell measurements and cell (re)selection; obtains system information and can send SI requests (if configured); performs available measurements and logging of location and time for UEs configured for logged measurements.

[0054] In RRC_INACTIVE, UE-specific DRX can be configured by upper layers or the RRC layer; the UE stores the UE inactive access stratum (AS) context; the RAN-based notification area is configured by the RRC layer. The UE monitors short messages sent with P-RNTI on DCI; monitors the paging channel for CN paging using 5G-S-TMSI and RAN paging using full I-RNTI; performs neighbor cell measurements and cell (re)selection; performs RAN-based notification area updates periodically and when moving outside the configured RAN-based notification area; obtains system information and can send SI requests (if configured); performs available measurements and logging of location and time for UEs configured with logged measurements.

[0055] In RRC_CONNECTED, the UE stores the AS context and transmission of unicast data to / from the UE occurs. The UE monitors the short message sent with the P-RNTI on the DCI (if configured); monitors the control channel associated with the shared data channel to determine whether data is scheduled for it; provides channel quality and feedback information; performs neighbor cell measurements and measurement reports; and obtains system information.

[0056] PDCCH in the fifth generation wireless communication system: In the fifth generation wireless communication system, the physical downlink control channel (PDCCH) is used to schedule DL transmission on PDSCH and UL transmission on PUSCH, wherein the downlink control information (DCI) on the PDCCH includes: downlink assignments containing at least modulation and coding format, resource allocation and hybrid ARQ information related to DL-SCH; uplink scheduling authorization containing at least modulation and coding format, resource allocation and hybrid ARQ information related to UL-SCH. In addition to scheduling, PDCCH can be used for: activation and deactivation of configured PUSCH transmissions with configuration authorization; activation and deactivation of PDSCH semi-persistent transmissions; notifying one or more UEs of the time slot format; notifying one or more UEs of PRBs and orthogonal frequency division multiplexing (OFDM) symbols, where the UE can assume that no transmission is intended for the UE; transmission of TPC commands for PUCCH and PUSCH; transmission of one or more TPC commands for SRS transmission through one or more UEs; switching the active bandwidth portion of the UE; initiating a random access procedure. The UE monitors the PDCCH candidate set in the configured monitoring opportunities in one or more configured control resource sets (CORESETs) according to the corresponding search space configuration. A CORESET consists of a set of PRBs with a duration of 1 to 3 OFDM symbols. Resource unit resource element groups (REGs) control channel elements (CCEs) are defined within a CORESET, where each CCE consists of a set of REGs. A control channel is formed by the aggregation of CCEs. Different code rates for the control channel are achieved by aggregating different numbers of CCEs. Interleaved and non-interleaved CCE to REG mapping are supported in a CORESET. Polarization coding is used for PDCCH. Each resource element group carrying a PDCCH carries its own demodulation reference signal (DMRS). Quadrature phase shift keying (QPSK) modulation is used for PDCCH.

[0057] In the fifth generation wireless communication system, for each configured BWP of the serving cell, a search space configuration list is signaled by the GNB, where each search configuration is uniquely identified by a search space identifier. The search space identifier is unique among the BWPs of the serving cell. For each configured BWP, the gNB explicitly signals the identifier of the search space configuration to be used for a specific purpose (such as paging reception, SI reception, random access response reception). In NR, the search space configuration includes parameters Monitoring-periodicity-PDCCH-slot, Monitoring-offset-PDCCH-slot, Monitoring-symbols-PDCCH-within-slot and duration. The UE uses the parameters PDCCH monitoring periodicity (Monitoring-periodicity-PDCCH-slot), PDCCH monitoring offset (Monitoring-offset-PDCCH-slot) and PDCCH monitoring mode (Monitoring-symbols-PDCCH-within-slot) to determine the PDCCH monitoring timing within the timeslot. The PDCCH monitoring opportunity exists in time slots 'x' to x+duration, where the time slot with number 'x' in the radio frame with number 'y' satisfies the following equation:

[0058] (y*(number of slots in a radio frame)+x-Monitoring-offset-PDCCH-slot)mod(Monitoring-periodicity-PDCCH-slot)=0;

[0059] The starting symbol of the PDCCH monitoring opportunity in each time slot with a PDCCH monitoring opportunity is given by Monitoring-symbols-PDCCH-within-slot. The length of the PDCCH monitoring opportunity (in symbols) is given in the corset associated with the search space. The search space configuration includes an identifier of the coreset configuration associated with it. For each configured BWP of the serving cell, a list of coreset configurations is signaled by the GNB, where each coreset configuration is uniquely identified by a coreset identifier. The coreset identifier is unique among the BWPs of the serving cell. Note that each radio frame has a duration of 10ms. Radio frames are identified by radio frame numbers or system frame numbers. Each radio frame includes several time slots, where the number of time slots in a radio frame and the duration of the time slots depend on the subcarrier spacing. The number of time slots in a radio frame and the duration of the time slots depend on the radio frames of each supported SCS predefined in NR. Each coreset configuration is associated with a list of transmission configuration indicator (TCI) states. Each TCI state configures a DL RS ID (synchronization signal block (SSB) or channel state information reference signal (CSI RS)). The gNB signals a list of TCI states corresponding to the coreset configuration via RRC signaling. One of the TCI states in the TCI state list is activated by the gNB and indicated to the UE. The TCI state indicates the DL TX beam that the gNB uses to transmit PDCCH in the PDCCH monitoring opportunity of the search space (the DL TX beam is quasi-co-located (QCLed) with the SSB / CSI RS of the TCI state).

[0060] Downlink Scheduling in the Fifth Generation Wireless Communication System: In the downlink, the gNB can dynamically allocate resources to the UE via the Cell Radio Network Temporary Identifier (C-RNTI) on the PDCCH. The UE always monitors the PDCCH to find possible assignments when its downlink reception is enabled (an activity managed by DRX when configured). When CA is configured, the same C-RNTI applies to all serving cells.

[0061] The gNB may preempt an ongoing PDSCH transmission of one UE with a latency critical transmission to another UE. The gNB may configure the UE to monitor for interrupted transmission indications using the INT-RNTI on the PDCCH. If a UE receives an interrupted transmission indication, the UE may assume that the resource elements included in the indication carry no information useful to the UE, even if some of these resource elements have been scheduled for the UE.

[0062] In addition, with semi-persistent scheduling (SPS), the gNB can allocate downlink resources for initial hybrid automatic repeat request (HARQ) transmissions to the UE: RRC defines the periodicity of the configured downlink assignments, and the PDCCH addressed to the configured scheduling radio network temporary identifier (CS-RNTI) can signal and activate the configured downlink assignments, or deactivate the configured downlink assignments; that is, the PDCCH addressed to the CS-RNTI indicates that the downlink assignments can be implicitly reused according to the periodicity defined by RRC until deactivated. Retransmissions are explicitly scheduled on the PDCCH when needed.

[0063] If dynamically allocated downlink reception overlaps in time, the dynamically allocated downlink reception overrides the configured downlink assignment in the same serving cell. Otherwise, downlink reception according to the configured downlink assignment is assumed (if activated). For a given BWP of a serving cell, a UE may be configured with up to 8 active configured downlink assignments. When more than one is configured:

[0064] - The network decides which of these configured downlink assignments are active at a time (including all of them); and

[0065] - Each configured downlink assignment is activated individually using a DCI command, and deactivation of configured downlink assignments is done using a DCI command, which may deactivate a single configured downlink assignment or jointly deactivate multiple configured downlink assignments.

[0066] Uplink Scheduling in the Fifth Generation Wireless Communication System: In the uplink, the gNB can dynamically allocate resources to the UE via the C-RNTI on the PDCCH. The UE always monitors the PDCCH to find possible grants for uplink transmission when its downlink reception is enabled (an activity managed by DRX when configured). When CA is configured, the same C-RNTI applies to all serving cells.

[0067] The gNB may cancel a PUSCH transmission, or a repetition of a PUSCH transmission, or an SRS transmission of a UE for another UE with a latency critical transmission. The gNB may configure the UE to monitor for a cancelled transmission indication using the CI-RNTI on the PDCCH. If the UE receives a cancelled transmission indication, the UE shall cancel the PUSCH transmission or the SRS transmission overlapping the resources indicated by the cancellation from the earliest symbol overlapping the resources. Additionally, with the configured grant, the gNB may allocate uplink resources for the initial HARQ transmission and HARQ retransmissions to the UE. Two types of configured uplink grants are defined:

[0068] - For Type 1, RRC directly provides the configured uplink grant (including periodicity).

[0069] -For type 2, RRC defines the periodicity of the configured uplink grant, and the PDCCH addressed to the CS-RNTI can signal and activate the configured uplink grant, or deactivate it; that is, the PDCCH addressed to the CS-RNTI indicates that the uplink grant can be implicitly reused according to the periodicity defined by RRC until deactivation.

[0070] If the UE is not configured with enhanced intra-UE overlapping resource priority, the dynamically allocated uplink transmissions overwrite the configured uplink grants in the same serving cell (if they overlap in time). Otherwise, uplink transmissions according to the configured uplink grants are assumed (if activated).

[0071] If the UE is configured with enhanced intra-UE overlapping resource prioritization, in case a configured uplink grant transmission overlaps in time with a dynamically allocated uplink transmission or with another configured uplink grant transmission in the same serving cell, the UE prioritizes the transmission based on a comparison between the highest priority of the logical channels that have data to be transmitted and are multiplexed or can be multiplexed in the MAC protocol data unit (PDU) associated with the overlapping resources. Similarly, in case a configured uplink grant transmission or a dynamically allocated uplink transmission overlaps in time with a scheduling request transmission, the UE prioritizes the transmission based on a comparison between the priority of the logical channel that triggered the scheduling request and the highest priority of the logical channels that have data to be transmitted and are multiplexed or can be multiplexed in the MAC PDU associated with the overlapping resources. In case a MAC PDU associated with the de-prioritized transmission has been generated, the UE keeps it stored to allow the gNB to schedule a retransmission. The UE may also be configured by the gNB to transmit the stored MAC PDU as a new transmission using subsequent resources configured by the same configured uplink grant when no explicit retransmission grant is provided by the gNB.

[0072] Retransmissions other than repetitions are explicitly assigned via the PDCCH or via configuration of a retransmission timer.

[0073] For a given BWP of a serving cell, a UE may be configured with up to 12 active configured uplink grants. When more than one is configured, the network decides which of these configured uplink grants is active at a time (including all uplink grants). Each configured uplink grant may be type 1 or type 2. For type 2, activation and deactivation of configured uplink grants are independent between serving cells. When more than one type 2 configured grant is configured, each configured grant is activated individually using a DCI command, and deactivation of a type 2 configured grant is accomplished using a DCI command, which may deactivate a single configured grant configuration or jointly deactivate multiple configured grant configurations.

[0074] When SUL is configured, the network shall ensure that an uplink grant of an active configuration on SUL does not overlap in time with an uplink grant of another active configuration on other UL configurations.

[0075] For both dynamic grants and configured grants, for a transport block, two or more repetitions may be in one slot, or across slot boundaries in consecutive available slots, with each repetition being in one slot. For both dynamic grants and configured grant type 2, the number of repetitions may also be indicated dynamically in L1 signaling. The dynamically indicated number of repetitions shall override the RRC configured number of repetitions, if both are present.

[0076] Extended Reality (XR) is a term used for different types of reality and refers to all combined real and virtual environments and human-computer interactions generated by computer technology and wearable devices. It includes the following representative forms and areas interpolated between them: Augmented Reality (AR); Mixed Reality (MR); Virtual Reality (VR). In the case of applications / services such as XR, the DL packet arrival of XR may not be aligned with the configured downlink assignment due to jitter. Downlink assignments configured with short periodicity can reduce the impact due to jitter, but it increases the power consumption of the UE because the UE tries to receive and decode TBs in each configured downlink assignment.

[0077] Therefore, an enhanced sending and receiving method using configuration authorization is needed.

[0078] Figure 1 A set of downlink resources configured to occur periodically according to an embodiment of the present disclosure is shown.

[0079] refer to Figure 1 A set of "N" downlink resources (or PDSCH resources or configured downlink grants) is configured to occur periodically (with a periodicity P), where N is an integer > 1, such as Figure 1As shown. Out of each "N" configured downlink resource set, only one is used for downlink transmission of a transport block (TB) on PDSCH. Each downlink resource (or PDSCH resource or configured downlink grant) is basically a set of PRBs spanning one or more OFDM symbols for sending a transport block by the gNB.

[0080] Depending on the packet arrival time, the network (i.e. gNB) uses one of these “N” configured downlink resources (or PDSCH resources or configured downlink grants) to send a TB in the downlink. Figure 1 In the present embodiment, if a packet arrives before the configured DL resource 1 (or early enough to prepare the TB), the gNB can use the configured DL resource 1 to send the TB in the downlink; and if a packet arrives between the configured DL resources 1 and 2, the gNB can use the configured DL resource 2 (if the packet arrives sufficiently before DL resource 2 to prepare the TB). Figure 2 is an example of operation at the gNB.

[0081] Figure 2 A flow chart describing a method performed by a base station according to an embodiment of the present disclosure is shown.

[0082] refer to Figure 2 In operation 201, the base station may configure a downlink resource set, wherein the downlink resource set appears periodically.

[0083] In operation 203, the base station may select one downlink resource in a downlink resource set in a period for transmitting a TB in a downlink based on packet arrival.

[0084] In operation 205, the base station may skip transmission in downlink resources in the set except for the selected downlink resources.

[0085] Figure 3 A flowchart describing a method performed by a terminal according to an embodiment of the present disclosure is shown.

[0086] refer to Figure 3 In operation 301, a terminal may receive a downlink resource set from a base station, where the downlink resource set appears periodically.

[0087] In operation 303, the terminal may monitor downlink resources for receiving DL TBs in each period.

[0088] In operation 305, if the UE detects a downlink transmission / reception TB in one downlink resource among the set of "N" downlink resources, the UE does not monitor the remaining downlink resources in the set. For example, if the UE detects a downlink transmission / reception TB in the configured DL resource 1, the UE may skip monitoring the remaining configured DL resources 2 to N in the set in period P. Figure 3 is an example of operation at the UE.

[0089] These "N" configured downlink resources may be time division multiplexed. One or more of these resources may be present in a timeslot. The total duration of these N configured downlink resources may span one or more timeslots. The gaps between these N configured downlink resources may be in units of timeslots / symbols. The gaps may also be zero. The gaps between each of these N configured downlink resources may be the same or may be different. The gaps may be signaled by the gNB in ​​a dedicated signaling message (e.g., an RRC reconfiguration message) or in a DCI. In an embodiment, instead of gaps, a repetition interval may be configured to indicate these N configured downlink resources. The frequency domain resources (PRBs) occupied by each of these N configured downlink resources may be the same or different. The gNB signals the time (slot / symbol / subframe / frame, etc.) and frequency locations (PRBs, e.g. starting PRB index, ending PRB index / number of PRBs) of these N configured downlink resources in a dedicated signaling message (e.g. RRC reconfiguration message) or DCI (PDCCH addressed to C-RNTI or CS-RNTI or another UE-specific RNTI). The gNB signals the periodicity in a dedicated signaling message (e.g. RRC reconfiguration message).

[0090] Figure 4 A downlink allocation configuration belonging to the same group according to an embodiment of the present disclosure is shown.

[0091] refer to Figure 4 , in order to configure a set of "N" downlink resources that appear periodically, the network (i.e. gNB) can signal multiple downlink assignment configurations. Each downlink assignment configuration includes a periodicity and indicates the time (time slot / symbol / subframe / frame, etc.) and frequency resources (PRB) of one downlink resource that appears periodically with the indicated periodicity. The gNB indicates which of these multiple downlink assignment configurations belongs to the same group. This can be done by including a group or set index in the configuration. The periodicity indicated in each downlink assignment configuration belonging to the same group can be the same. If "N" downlink assignment configurations belong to the same group, the set of "N" downlink resources includes one downlink resource from each of these configurations. Figure 4An example of 3 downlink assignment configurations belonging to the same group is shown in FIG.

[0092] In an alternative embodiment, in order to configure a set of "N" downlink resources that appear periodically, the network (i.e., gNB) may signal multiple downlink assignment configurations. Each downlink assignment configuration includes a periodicity. The gNB indicates which of these multiple downlink assignment configurations belongs to the same group. This can be done by including a group or set index in the configuration. The periodicity indicated in each downlink assignment configuration belonging to the same group may be the same. The PDCCH addressed to another RNTI or CS_RNTI for activation indicates the time (time slot / symbol / subframe / frame, etc.) and frequency resources (PRBs) of the downlink resources that appear periodically with the periodicity indicated by the RRC for the downlink assignment configuration. If the "N" downlink assignment configurations belong to the same group, the set of "N" downlink resources includes one downlink resource corresponding to each of these configurations.

[0093] In an alternative embodiment, to configure a set of "N" downlink resources that occur periodically, the network (i.e., gNB) may signal a downlink assignment configuration. The downlink assignment configuration includes a periodicity. The downlink assignment configuration is associated with a set of N downlink resources that occur periodically with the indicated periodicity. The downlink assignment configuration includes the time (slot / symbol / subframe / frame, etc.) and frequency resources (PRBs) for each of the N downlink resources.

[0094] In an alternative embodiment, to configure a set of "N" downlink resources that occur periodically, the network (i.e., gNB) may signal a downlink assignment configuration. The downlink assignment configuration includes a periodicity. The downlink assignment configuration is associated with a set of N downlink resources that occur periodically with the indicated periodicity. The PDCCH addressed to another RNTI or CS_RNTI for activation indicates the time (time slot / symbol / subframe / frame, etc.) and frequency resources (PRBs) of the "N" downlink resources corresponding to the downlink assignment configuration. These N downlink resources occur periodically with the periodicity indicated by the RRC.

[0095] Figure 5 A downlink resource set configured to appear periodically through a signal from a base station according to an embodiment of the present disclosure is shown.

[0096] In an alternative embodiment, to configure a set of "N" downlink resources that occur periodically, the network may signal the set of "N" downlink resources.

[0097] -timeReferenceSFN: SFN used to determine the offset of resources in the time domain.

[0098] -timeDomainOffset: resource offset relative to SFN = timeReferenceSFN in the time domain;

[0099] -timeDomainAllocation: Allocation of downlink grants configured in the time domain, which contains startSymbolAndLength

[0100] -periodicity: periodicity

[0101] The first DL resource in the set of "N" DL resources occurs in a time slot that starts at an offset timeDomainOffset from timeReferenceSFN, and thereafter the first DL resource in the set of "N" DL resources occurs with a periodicity given by periodicity, such as Figure 5 As shown. The other time slots containing the remaining DL resources can be indicated by the signaling parameter interval / gap between the time slots including the DL resources. In each time slot with DL resources, the DL resources appear in at least one symbol indicated by startSymbolAndLength or startSymbol, and the total number of symbols of the resources is given by the length in startSymbolAndLength. In an alternative embodiment, instead of timeDomainOffset and timeReferenceSFN, the starting SFN can be indicated. The first DL resource of the first set of "N" DL resources appears in a radio frame given by the start frame and in a time slot indicated by the starting time slot number, and then the first DL resource of another set of "N" DL resources appears with a periodicity given by periodicity.

[0102] Figure 6 Packet arrival and timing of downlink resources related to transmission of packets according to an embodiment of the present disclosure are shown.

[0103] refer to Figure 6 , in case of downlink semi-persistent scheduling, the network can use PDCCH to change the activated DL assignment / resource location. However, when the UE is not in active time, the UE can receive DL TB in the assigned DL assignment / resource and does not monitor PDCCH. Therefore, if the timing of packet arrival is not aligned with the DL SPS resource, there will be a delay in sending the packet, such as Figure 6 shown.

[0104] In order to handle jitter, in an embodiment of the present disclosure, it is proposed that when the UE is not in active time, the UE may monitor the PDCCH in one or more PDCCH monitoring opportunities before and / or after the activated DL assignment / resource. The PDCCH may assign a dynamic grant or be used to change the DL assignment / resource timing in the case where a DL packet arrives earlier or later than the DL assignment / resource timing. The gNB may signal the UE in a dedicated signaling message (e.g., an RRC reconfiguration message) the search space configuration (or a search space in a search space configuration list for this purpose) for this PDCCH monitoring in inactive time. In an embodiment, the search space configuration for this PDCCH monitoring in inactive time may be the search space configuration that the UE uses to receive the PDCCH for the DL assignment / resource in the active state. Note that in an embodiment, the search space configuration is per BWP, and the UE applies the configuration of the active DL BWP.

[0105] Figure 7 An example of PDCCH monitoring in an inactive state before DL SPS resources according to an embodiment of the present disclosure is shown.

[0106] refer to Figure 7 , the UE may monitor the PDCCH monitoring opportunities occurring in the duration before the DL SPS resource. The duration may be signaled by the gNB (e.g., in a dedicated signaling message such as an RRC reconfiguration message). If the DL SPS resource starts in slot X and the duration is 5 slots, the UE may monitor the PDCCH monitoring opportunities occurring in slots X-5 to X-1. The location of the PDCCH monitoring opportunity within the duration is determined based on the search space configuration used for that PDCCH monitoring.

[0107] Figure 8 Another example of PDCCH monitoring in an inactive state before DL SPS resources according to an embodiment of the present disclosure is shown.

[0108] refer to Figure 8 , the UE may monitor PDCCH monitoring opportunities occurring in the duration before the DL SPS resource and also during the slots of the DL SPS resource. The duration may be signaled by the gNB (e.g., in a dedicated signaling message such as an RRC reconfiguration message). If the DL SPS resource starts in slot X and the duration is 5 slots, the UE may monitor PDCCH monitoring opportunities occurring in slots X-5 to X-1 and slot X. The location of the PDCCH monitoring opportunity within the duration is determined based on the search space configuration used for that PDCCH monitoring.

[0109] Fig. 9An example of PDCCH monitoring in an inactive state before and after DL SPS resources according to an embodiment of the present disclosure is shown.

[0110] refer to Fig. 9 , the UE may monitor PDCCH monitoring opportunities occurring in the duration before and after the DL SPS resource. The duration may be signaled by the gNB (e.g., in a dedicated signaling message such as an RRC reconfiguration message). If the DL SPS resource starts in slot X and the duration is 5 slots, the UE may monitor PDCCH monitoring opportunities occurring in slots X-5 to X-1 and X+1 to X+5. The value of the duration may be different before and after the DL SPS resource. The location of the PDCCH monitoring opportunity within the duration is determined based on the search space configuration used for that PDCCH monitoring.

[0111] Fig.10 An example of PDCCH monitoring in an inactive state before and after DL SPS resources according to an embodiment of the present disclosure is shown.

[0112] refer to Fig.10 , the UE may monitor PDCCH monitoring opportunities occurring in the duration before and after the DL SPS resource and during the DL SPS resource. The duration may be signaled by the gNB (e.g., in a dedicated signaling message such as an RRC reconfiguration message). If the DL SPS resource starts in slot X and the duration is 5 slots, the UE may monitor PDCCH monitoring opportunities occurring in slots X-5 to X-1, X, and X+1 to X+5. The value of the duration may be different before and after the DL SPS resource. The location of the PDCCH monitoring opportunity within the duration is determined based on the search space configuration used for that PDCCH monitoring.

[0113] Fig.11 An example of PDCCH monitoring in an inactive state according to an embodiment of the present disclosure is shown.

[0114] refer to Fig.11 , the UE may monitor PDCCH monitoring opportunities occurring in a duration starting at one or more offsets before the DL SPS resource. The duration and offset may be signaled by the gNB (e.g., in a dedicated signaling message such as an RRC reconfiguration message). The location of the PDCCH monitoring opportunity within the duration is determined based on the search space configuration used for that PDCCH monitoring.

[0115] Fig.12 Another example of PDCCH monitoring in an inactive state according to an embodiment of the present disclosure is shown.

[0116] refer to Fig.12 , the UE may monitor PDCCH monitoring opportunities occurring in a duration starting at "offset + duration" before the DL SPS resource. The duration and offset may be signaled by the gNB (e.g., in a dedicated signaling message such as an RRC reconfiguration message). The location of the PDCCH monitoring opportunity within the duration is determined based on the search space configuration used for that PDCCH monitoring.

[0117] Fig.13 Monitoring of the PDCCH during inactive time according to an embodiment of the present disclosure is shown.

[0118] refer to Fig.13 , in order to handle jitter, in an embodiment of the present disclosure, it is proposed that when the UE is not in active time, the UE may monitor the PDCCH in one or more PDCCH monitoring opportunities configured by the search space configuration for PDCCH monitoring in inactive time, such as Fig.13 As shown. This PDCCH can be used to change the DL assignment / resource timing, or to assign a dynamic grant in case a DL packet arrives earlier or later than the DL assignment / resource timing. The gNB may signal the search space configuration (or a search space in a search space configuration list for this purpose) to the UE for this PDCCH monitoring in inactive time in a dedicated signaling message (e.g., an RRC reconfiguration message). Note that in an embodiment, the search space configuration is per BWP, and the UE applies the configuration of the active DL BWP.

[0119] Fig.14 A set of uplink resources configured to occur periodically according to an embodiment of the present disclosure is shown.

[0120] refer to Fig.14 A set of "N" uplink resources (PUSCH resources or configured UL grants) is configured to occur periodically (with a periodicity P), where N is an integer ≥ 1, such as Fig.14 As shown. Among each set of "N" configured uplink resources (PUSCH resources or configured UL grants), only one is used for uplink transmission. Each uplink resource is basically a set of PRBs spanning one or more OFDM symbols for sending transport blocks by the UE.

[0121] Depending on the packet arrival time, the UE uses one of these "N" configured uplink resources to send a TB in the uplink. Fig.14In the embodiment, if the packet arrives before the configured UL resource 1 (or early enough to prepare the TB), the UE can use the configured UL resource 1 to send the TB in the uplink; if the packet arrives between the configured UL resources 1 and 2, the UE can use the configured UL resource 2 (if the packet arrives before UL resource 2 enough to prepare the TB). Fig.15 is an example of operation at the UE.

[0122] Fig.15 A flowchart describing a method performed by a terminal according to an embodiment of the present disclosure is shown.

[0123] refer to Fig.15 In operation 1501, the terminal may receive an uplink resource set from a base station, where the uplink resource set appears periodically.

[0124] In operation 1503, the terminal may select one of the uplink resources in the period based on the packet arrival for transmitting the TB in the uplink.

[0125] In operation 1505, the terminal may skip transmission in uplink resources other than the selected uplink resources.

[0126] Fig.16 A flow chart describing a method performed by a base station according to an embodiment of the present disclosure is shown.

[0127] refer to Fig.16 In operation 1601, the base station may configure an uplink resource set, wherein the uplink resource set appears periodically.

[0128] In operation 1603, the base station may monitor uplink resources for receiving UL TBs every period.

[0129] At operation 1605, if the gNB detects an uplink transmission received TB in one uplink resource among the set of "N" uplink resources, the gNB does not monitor the remaining uplink resources in the set. For example, if the gNB detects an uplink transmission / received TB in the configured UL resource 1, it skips monitoring the remaining configured UL resources 2 to N of the set in period P. Fig.16 is an example of operation at the gNB.

[0130] These "N" configured uplink resources may be time division multiplexed. One or more of these resources may be present in a timeslot. The total duration of these N configured uplink resources may span one or more timeslots. The gaps between these N configured uplink resources may be in units of timeslots / symbols. The gaps may also be zero. The gaps between each of these N configured uplink resources may be the same or may be different. The gNB may signal the gaps in a dedicated signaling message (e.g., an RRC reconfiguration message) or in a DCI. In an embodiment, instead of gaps, a repetition interval may be configured to indicate these N configured uplink resources. The frequency domain resources (PRBs) occupied by each of these N configured uplink resources may be the same or different. The time (slot / symbol / subframe / frame etc.) and frequency locations (PRBs, e.g. starting PRB index, ending PRB index / number of PRBs) of these N configured uplink resources are signaled by the gNB in ​​a dedicated signaling message (e.g. RRC reconfiguration message) or in DCI (PDCCH addressed to C-RNTI or CS-RNTI or another UE specific RNTI). The gNB signals the periodicity in a dedicated signaling message (e.g. RRC reconfiguration message).

[0131] Fig.17 An example of uplink assignment configuration belonging to the same group according to an embodiment of the present disclosure is shown.

[0132] refer to Fig.17 In order to configure a set of "N" uplink resources that appear periodically, the network (i.e. gNB) can signal multiple uplink assignment configurations. Each uplink assignment configuration includes a periodicity and indicates the time (time slot / symbol / subframe / frame, etc.) and frequency resources (PRB) of an uplink resource that appears periodically with the indicated periodicity. The gNB indicates which of these multiple uplink assignment configurations belongs to the same group. This can be done by including a group or set index in the configuration. The periodicity indicated in each uplink assignment configuration belonging to the same group can be the same. If "N" uplink assignment configurations belong to the same group, the set of "N" uplink resources includes one uplink resource from each of these configurations. Fig.17 An example of 3 uplink assignment configurations belonging to the same group is shown in .

[0133] In an alternative embodiment, in order to configure a set of "N" uplink resources that appear periodically, the network (i.e., gNB) may signal multiple uplink assignment configurations. Each uplink assignment configuration includes a periodicity. The gNB indicates which of these multiple uplink assignment configurations belongs to the same group. This can be done by including a group or set index in the configuration. The periodicity indicated in each uplink assignment configuration belonging to the same group may be the same. The PDCCH addressed to the CS_RNTI or another RNTI used for activation indicates the time (time slot / symbol / subframe / frame, etc.) and frequency resources (PRBs) of the uplink resources that appear periodically with the periodicity indicated by the RRC for the uplink assignment configuration. If "N" uplink assignment configurations belong to the same group, the set of "N" uplink resources includes one uplink resource corresponding to each of these configurations.

[0134] In an alternative embodiment, to configure a set of "N" uplink resources that occur periodically, the network (i.e., gNB) may signal an uplink assignment configuration. The uplink assignment configuration includes a periodicity. The uplink assignment configuration is associated with a set of N uplink resources that occur periodically with the indicated periodicity. The uplink assignment configuration includes the time (slot / symbol / subframe / frame, etc.) and frequency resources (PRBs) for each of the N uplink resources.

[0135] In an alternative embodiment, to configure a set of "N" uplink resources that occur periodically, the network (i.e., gNB) may signal an uplink assignment configuration. The uplink assignment configuration includes a periodicity. The uplink assignment configuration is associated with a set of N uplink resources that occur periodically with the indicated periodicity. The PDCCH addressed to the CS_RNTI or another RNTI for activation indicates the time (time slot / symbol / subframe / frame, etc.) and frequency resources (PRBs) of the "N" uplink resources corresponding to the uplink assignment configuration. These N uplink resources occur periodically with a periodicity indicated by the RRC.

[0136] Fig.18 An uplink resource set configured to appear periodically through a signal from a base station according to an embodiment of the present disclosure is shown.

[0137] refer to Fig.18 In an alternative embodiment, to configure a set of "N" uplink resources that occur periodically, the network may signal the following:

[0138] -timeReferenceSFN: SFN used to determine the offset of resources in the time domain.

[0139] -timeDomainOffset: resource offset relative to SFN = timeReferenceSFN in the time domain;

[0140] -timeDomainAllocation: Allocation of uplink grants configured in the time domain, which contains startSymbolAndLength

[0141] -periodicity: periodicity

[0142] The first UL resource in the set of "N" UL resources occurs in a time slot that starts at an offset timeDomainOffset from timeReferenceSFN, and thereafter the first UL resource in the set of "N" UL resources occurs with a periodicity given by periodicity, such as Fig.18 As shown. The other time slots containing the remaining UL resources can be indicated by the signaling parameter interval / gap between the time slots including the UL resources. In each time slot with UL resources, the UL resources appear in symbols indicated by startSymbolAndLength or startSymbol, and the total number of symbols of the resources is given by the length in startSymbolAndLength. In an alternative embodiment, instead of timeDomainOffset and timeReferenceSFN, the starting SFN can be indicated. The first UL resource in the first set of "N" UL resources appears in a radio frame given by the start frame and in a time slot indicated by the starting time slot number, and then the first UL resource in another set of "N" UL resources appears with a periodicity given by periodicity.

[0143] In an embodiment, it may be indicated in RRC signaling whether these "N" configured uplink resources in the set are used for repetition (ie, the UE sends the same TB in all these uplink resources) or only one of these resources is used for transmission (as described above).

[0144] In case of UL CG, UL CG repetition signaling can be used to handle UL traffic jitter. Legacy CG repetition was originally introduced to improve reliability by repeating PUSCH transmission. The gNB configures repeated UL grants in consecutive slots with the same symbol allocation in each slot.

[0145] Repetition can also be used to reduce latency. For example, when a UL packet arrives slightly later than the first UL grant timing, the subsequent repeated CG UL grant can be used to send the UL packet without waiting for another CG grant periodicity. In this way, when UL traffic arrives slightly later due to jitter, the repetition can be used to reduce latency. However, some enhancements are needed to use it for XR traffic jitter handling.

[0146] First, the traditional CG repetition should be located in consecutive time slots, and the maximum possible length of the repetition window is 8 time slots with a maximum repetition level of 8, which seems too inflexible to handle various jitter distributions. Therefore, it is proposed to introduce a more flexible configuration of repeated CG for jitter handling. For example, CG repetitions with intervals of multiple time slots can be configured. Secondly, with traditional CG repetition, the UE should retransmit the same packet even when the repetition is not used for reliability improvement but for delay reduction. Therefore, we propose to apply CG skipping when CG repetition is used to handle XR service jitter (in all grants except one grant in the bundle of grants allocated for repetition), which can prevent the UE from wasting energy.

[0147] In an embodiment, the gNB may signal two new fields in configuredGrantConfiguration (i.e., CG repetition interval and a 1-bit indicator to allow single transmission for jitter handling) for CG type 1. If these new fields are indicated, the UE uses a CG from the CG set for each CG grant period.

[0148] According to an embodiment of the present disclosure, a method performed by a terminal in a wireless communication system is provided. The method may include: receiving configuration information associated with a set of multiple downlink resources from a base station, the set being configured to appear periodically; monitoring multiple downlink resources of the set in a period for receiving downlink data, wherein the multiple downlink resources are monitored sequentially; and skipping monitoring of the remaining one or more downlink resources of the set in the period when downlink data is received in the downlink resources of the set in the period.

[0149] In an embodiment, the downlink resource is selected from a set of multiple downlink resources based on packet arrival.

[0150] In an embodiment, the configuration information includes a plurality of downlink assignment configurations respectively corresponding to a plurality of downlink resources.

[0151] In an embodiment, each of the plurality of downlink assignment configurations indicates periodicity, time domain resource information, and frequency domain resource information.

[0152] In an embodiment, the configuration information further comprises information indicating which downlink assignment configuration of the plurality of downlink assignment configurations corresponds to the same set.

[0153] In an embodiment, the configuration information includes a parameter indicating a reference system frame number (SFN), a parameter indicating an offset relative to the reference SFN, a parameter associated with time domain allocation, and a parameter indicating periodicity.

[0154] In an embodiment, the first downlink resource of the set occurs in a time slot starting at an offset from a reference SFN.

[0155] In an embodiment, the parameter associated with the time domain allocation indicates at least one symbol occupied by the first downlink resource in a time slot.

[0156] In an embodiment, the configuration information further includes a parameter indicating a spacing or gap between the first downlink resource and the second downlink resource in the set.

[0157] According to an embodiment of the present disclosure, a method performed by a base station in a wireless communication system is provided. The method may include: determining a downlink resource from a set of multiple downlink resources based on packet arrival, wherein the remaining one or more downlink resources of the set are not configured for sending downlink data; sending configuration information associated with a set of multiple downlink resources to a terminal, wherein the set is configured to appear periodically; and sending downlink data to the terminal in the determined downlink resource.

[0158] In an embodiment, the plurality of downlink resources are monitored sequentially.

[0159] In an embodiment, the configuration information includes a plurality of downlink assignment configurations respectively corresponding to a plurality of downlink resources.

[0160] In an embodiment, each of the plurality of downlink assignment configurations indicates periodicity, time domain resource information, and frequency domain resource information.

[0161] According to an embodiment of the present disclosure, a terminal in a wireless communication system is provided. The terminal may include: receiving configuration information associated with a set of multiple downlink resources from a base station via a transceiver, the set being configured to appear periodically; monitoring multiple downlink resources of the set in a period for receiving downlink data, wherein the multiple downlink resources are monitored sequentially; and skipping monitoring of the remaining one or more downlink resources of the set in the period when downlink data is received in the downlink resources of the set in the period.

[0162] According to an embodiment of the present disclosure, a base station in a wireless communication system is provided. The base station may include: a transceiver; and at least one processor coupled to the transceiver and configured to: determine a downlink resource from a set of multiple downlink resources based on packet arrival, wherein the remaining one or more downlink resources of the set are not configured for sending downlink data; send configuration information associated with a set of multiple downlink resources to a terminal via the transceiver, wherein the set is configured to appear periodically; and send downlink data to the terminal in the determined downlink resource via the transceiver.

[0163] Fig.19 is a diagram illustrating a UE 1900 according to an embodiment of the present disclosure.

[0164] refer to Fig.19 UE 1900 may include a processor 1910, a transceiver 1920, and a memory 1930. However, not all of the components shown are required. UE 1900 may include a processor 1910, a transceiver 1920, and a memory 1930. Fig.19 Furthermore, according to another embodiment, the processor 1910, the transceiver 1920, and the memory 1930 may be implemented as a single chip.

[0165] The aforementioned components will now be described in detail.

[0166] The processor 1910 may include one or more processors or other processing devices that control the proposed functions, processes and / or methods. The operations of the UE 1900 may be implemented by the processor 1910.

[0167] The transceiver 1920 may be connected to the processor 1910 and transmit and / or receive a signal. In addition, the transceiver 1920 may receive a signal through a wireless channel and output the signal to the processor 1910. The transceiver 1920 may transmit a signal output from the processor 1910 through a wireless channel.

[0168] The memory 1930 may store control information or data included in a signal obtained by the UE 1900. The memory 1930 may be connected to the processor 1910 and store at least one instruction or protocol or parameter for the proposed function, process and / or method. The memory 1930 may include a read-only memory (ROM) and / or a random access memory (RAM) and / or a hard disk and / or a compact disk read-only memory (CD-ROM) and / or a digital versatile disk (DVD) and / or other storage devices.

[0169] Fig. 20 is a diagram showing a base station 2000 according to an embodiment of the present disclosure.

[0170] refer to Fig. 20, the base station 2000 may include a processor 2010, a transceiver 2020, and a memory 2030. However, all the components shown are not required. The base station 2000 may be composed of Fig. 20 The components shown in the figure may be implemented with more or fewer components. In addition, according to another embodiment, the processor 2010, the transceiver 2020, and the memory 2030 may be implemented as a single chip. The aforementioned components will now be described in detail.

[0171] The processor 2010 may include one or more processors or other processing devices that control the proposed functions, processes and / or methods. The operations of the base station 900 may be implemented by the processor 2010.

[0172] The transceiver 2020 may be connected to the processor 2010 and transmit and / or receive signals. The signal may include control information and data. In addition, the transceiver 2020 may receive a signal through a wireless channel and output the signal to the processor 2010. The transceiver 2020 may transmit a signal output from the processor 2010 through a wireless channel.

[0173] The memory 2030 may store control information or data included in the signal obtained by the base station 2000. The memory 2030 may be connected to the processor 2010 and store at least one instruction or protocol or parameter for the proposed function, process and / or method. The memory 2030 may include a read-only memory (ROM) and / or a random access memory (RAM) and / or a hard disk and / or a CD-ROM and / or a DVD and / or other storage devices.

[0174] The methods according to various embodiments of the present disclosure described in the claims or the specification of the present disclosure may be implemented in hardware, software, or a combination of hardware and software.

[0175] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executed by one or more processors in an electronic device. One or more programs may include instructions for causing the electronic device to perform the methods of various embodiments of the present disclosure described in the claims or specification of the present disclosure.

[0176] The program (software module, software) may be stored in a random access memory (RAM), a non-volatile memory including flash memory, a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disk storage device, a compact disk-ROM (CD-ROM), a digital versatile disk (DVD) or other type of optical storage device and / or a magnetic tape cassette. Alternatively, the program may be stored in a memory including a combination of some or all of them. There may be multiple memories.

[0177] The program may also be stored in an attachable storage device that may be accessed via a communication network including the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof. The storage device may be connected to the apparatus for performing the various embodiments of the present disclosure via an external port. In addition, a separate storage device in the communication network may be connected to the apparatus for performing the various embodiments of the present disclosure.

[0178] In various embodiments of the present disclosure, components are represented in singular or plural form. However, it should be understood that singular or plural representation is appropriately selected according to the situation presented for ease of explanation, and the present disclosure is not limited to the singular or plural form of components. In addition, components expressed in plural form may also imply singular form, and vice versa.

[0179] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, configuration information associated with a set of a plurality of downlink resources, the set being configured to occur periodically; monitoring the plurality of downlink resources of the set in a period for receiving downlink data, the plurality of downlink resources being monitored sequentially; as well as In case downlink data is received in the downlink resources of the set in the period, monitoring of the remaining one or more downlink resources of the set in the period is skipped.

2. The method according to claim 1, wherein: A downlink resource is selected from among the plurality of downlink resources in the set based on packet arrival.

3. The method according to claim 1, wherein: The configuration information includes a plurality of downlink assignment configurations respectively corresponding to the plurality of downlink resources.

4. The method according to claim 3, wherein: Each of the plurality of downlink assignment configurations indicates periodicity, time domain resource information, and frequency domain resource information.

5. The method according to claim 3, wherein: The configuration information also includes information indicating which downlink assignment configuration of the plurality of downlink assignment configurations corresponds to the same set.

6. The method according to claim 1, wherein: The configuration information includes a parameter indicating a reference system frame number (SFN), a parameter indicating an offset relative to the reference SFN, a parameter associated with time domain allocation, and a parameter indicating periodicity.

7. The method according to claim 6, wherein: The first downlink resource of the set occurs in a time slot starting at an offset from a reference SFN.

8. The method according to claim 7, wherein: The parameter associated with the time domain allocation indicates at least one symbol occupied by the first downlink resource in the time slot.

9. The method according to claim 7, wherein: The configuration information also includes a parameter indicating a spacing or gap between the first downlink resource and the second downlink resource in the set.

10. A method performed by a base station in a wireless communication system, the method comprising: determining, based on the packet arrival, a downlink resource from a set of a plurality of downlink resources, remaining one or more downlink resources of the set not being configured for sending downlink data; Sending configuration information associated with a set of the plurality of downlink resources to a terminal, the set being configured to occur periodically; as well as Downlink data is sent to the terminal in the determined downlink resource.

11. The method according to claim 10, wherein: The plurality of downlink resources are monitored sequentially.

12. The method according to claim 10, wherein: The configuration information includes a plurality of downlink assignment configurations respectively corresponding to the plurality of downlink resources.

13. The method according to claim 12, wherein: Each of the plurality of downlink assignment configurations indicates periodicity, time domain resource information, and frequency domain resource information.

14. A terminal in a wireless communication system, the terminal comprising: Transceiver; and at least one processor coupled to the transceiver, Wherein, the at least one processor is configured to: receiving, via a transceiver, from a base station configuration information associated with a set of a plurality of downlink resources, the set being configured to occur periodically, monitoring the plurality of downlink resources of the set in a period for receiving downlink data, wherein the plurality of downlink resources are monitored sequentially, and In case downlink data is received in the downlink resources of the set in the period, monitoring of the remaining one or more downlink resources of the set in the period is skipped.

15. A base station in a wireless communication system, the base station comprising: Transceiver; and at least one processor coupled to the transceiver, Wherein, the at least one processor is configured to: determining a downlink resource from a set of a plurality of downlink resources based on the packet arrival, remaining one or more downlink resources of the set not being configured for transmitting downlink data, sending, via a transceiver, configuration information associated with a set of the plurality of downlink resources to a terminal, wherein the set is configured to occur periodically, and Downlink data is sent to the terminal via the transceiver in the determined downlink resources.

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