CN117242723A

CN117242723A - Method for transmitting channel state information report, user equipment, processing device, and storage medium, and method and base station for receiving channel state information report

Info

Publication number: CN117242723A
Application number: CN202280032881.8A
Authority: CN
Inventors: 裵德显; 梁锡喆; 朴海旭
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2021-05-10
Filing date: 2022-05-10
Publication date: 2023-12-15

Abstract

UE: receiving a radio resource control configuration associated with the CSI report; receiving trigger information for triggering reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting according to the radio resource configuration and the trigger information; and performing partial CSI reporting in which only a part of the CSI value set is calculated and the calculated CSI value is transmitted in the uplink resource, on the basis of which a time difference between the measurement resource and the uplink resource satisfies a predetermined condition.

Description

Method for transmitting channel state information report, user equipment, processing device, and storage medium, and method and base station for receiving channel state information report

Technical Field

The present disclosure relates to a wireless communication system.

Background

Various technologies such as machine-to-machine (M2M) communication, machine Type Communication (MTC), and various devices requiring high data throughput, for example, smart phones and tablet Personal Computers (PCs), have emerged and become popular. Thus, the data throughput required to be processed in cellular networks increases rapidly. To meet such a rapid increase in data throughput, a carrier aggregation technique or a cognitive radio technique for effectively employing more bands and a Multiple Input Multiple Output (MIMO) technique or a multiple Base Station (BS) cooperation technique for improving the data capacity transmitted on limited frequency resources have been developed.

As more and more communication devices require greater communication capacity, enhanced mobile broadband (eMBB) communication relative to conventional Radio Access Technologies (RATs) is required. In addition, large-scale machine type communication (mctc) for providing various services anytime and anywhere by connecting a plurality of devices and objects to each other is one of the main problems to be considered in next-generation communication.

Communication system designs that consider reliability and delay sensitive service/User Equipment (UE) are also being discussed. The introduction of next generation RATs is being discussed considering emmbb communication, mctc, ultra Reliable Low Latency Communication (URLLC), etc.

Disclosure of Invention

Technical problem

With the introduction of new radio communication technologies, the number of UEs to which a BS should provide services in a prescribed resource region is increasing, and the amount of data and control information transmitted/received by/from the BS to/from the UEs providing services is also increasing. Since the amount of resources available to the BS for communication with the UE is limited, a new method for the BS to efficiently receive/transmit uplink/downlink data and/or uplink/downlink control information using limited radio resources is required. In other words, due to the increase in the density of nodes and/or the density of UEs, a method of efficiently using high-density nodes or high-density UEs for communication is needed.

There is also a need for a method of efficiently supporting various services having different requirements in a wireless communication system.

For applications where performance is delay/delay sensitive, overcoming the delay or latency is an important challenge.

In order to support a new service (e.g., URLLC), a method of providing channel state information to a BS more quickly and with higher reliability is required.

The objects to be achieved with the present disclosure are not limited to those specifically described above, and other objects not described herein will be more clearly understood by those skilled in the art from the following detailed description.

Technical proposal

In one aspect of the present disclosure, a method of transmitting a Channel State Information (CSI) report by a User Equipment (UE) in a wireless communication system is provided. The method may include: receiving a radio resource control configuration related to CSI reporting; receiving trigger information that triggers reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the trigger information; and performing partial CSI reporting based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

In another aspect of the present disclosure, a UE configured to transmit CSI reports in a wireless communication system is provided. The UE may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations. The operations may include: receiving a radio resource control configuration related to CSI reporting; receiving trigger information that triggers reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the trigger information; and performing partial CSI reporting based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

In another aspect of the present disclosure, a processing device in a wireless communication system is provided. The processing device may include: at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations. The operations may include: receiving a radio resource control configuration related to CSI reporting; receiving trigger information that triggers reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the trigger information; and performing partial CSI reporting based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

In another aspect of the present disclosure, a computer-readable storage medium is provided. The storage medium may be configured to store at least one program code including instructions that, when executed, cause at least one processor to perform operations. The operations may include: receiving a radio resource control configuration related to CSI reporting; receiving trigger information that triggers reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the trigger information; and performing partial CSI reporting based on the time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

In another aspect of the present disclosure, a computer program stored in a computer readable storage medium is provided. The computer program may include at least one program code including instructions that when executed cause at least one processor to perform operations. The operations may include: receiving a radio resource control configuration related to a Channel State Information (CSI) report; receiving trigger information that triggers reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the trigger information; and performing partial CSI reporting based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

In another aspect of the present disclosure, a method of receiving a CSI report by a Base Station (BS) in a wireless communication system is provided. The method may include: transmitting a radio resource control configuration related to the CSI report to the UE; transmitting trigger information to the UE, the trigger information triggering reporting of a CSI value set configured by the radio resource control configuration; receiving trigger information that triggers reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the trigger information; and receiving a partial CSI report based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is received on the uplink resources.

In another aspect of the present disclosure, a BS configured to receive CSI reports in a wireless communication system is provided. The BS may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations. The operations may include: transmitting a radio resource control configuration related to the CSI report to the UE; transmitting trigger information to the UE, the trigger information triggering reporting of a CSI value set configured by the radio resource control configuration; receiving trigger information that triggers reporting of a CSI value set configured by a radio resource control configuration; determining measurement resources for CSI reporting and uplink resources for CSI reporting based on the radio resource configuration and the trigger information; and receiving a partial CSI report based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is received on the uplink resources.

In various aspects of the disclosure, the predetermined condition may include: the time difference is less than a CSI calculation time T1 predefined based on a complete CSI report in which the entire configured CSI value set is calculated, and is greater than a time T2 based on the end of measurement resources for the partial CSI report.

In each aspect of the disclosure, the operations may include performing or receiving a full CSI report based on the time difference being greater than T2, wherein the entire set of CSI values is calculated and the calculated set of CSI values is transmitted on the uplink resources.

In each aspect of the disclosure, the measurement resources may be no later than the uplink resources.

In each aspect of the disclosure, the radio resource control configuration may include a CSI configuration for partial CSI reporting.

In each aspect of the disclosure, with respect to the operation, performing the partial CSI report may include transmitting or receiving additional information regarding the partial CSI report on the uplink resource.

The above-described solutions are only a part of examples of the present disclosure, and various examples into which technical features of the present disclosure are incorporated may be derived and understood by those skilled in the art from the following detailed description.

Advantageous effects

According to some implementations of the present disclosure, wireless communication signals may be efficiently transmitted/received. Thus, the overall throughput of the wireless communication system may be improved.

According to some implementations of the present disclosure, various services having different requirements may be efficiently supported in a wireless communication system.

According to some implementations of the present disclosure, the delay/delay generated during radio communication between communication devices may be reduced.

According to some implementations of the present disclosure, channel State Information (CSI) processing time may be reduced.

According to some implementations of the present disclosure, CSI may be provided to a Base Station (BS) faster and with higher reliability.

According to some implementations of the disclosure, a User Equipment (UE) may use less information for CSI reporting, and thus, a BS may use less radio resources to achieve the same level of reliability, which may help to save overall uplink system resources.

Effects according to the present disclosure are not limited to those specifically described above, and other effects not described herein will be more clearly understood by those skilled in the art to which the present disclosure pertains from the following detailed description.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, illustrate examples of implementations of the disclosure and together with the detailed description serve to explain implementations of the disclosure:

Fig. 1 shows an example of a communication system 1 to which an implementation of the present disclosure is applied;

fig. 2 is a block diagram illustrating an example of a communication device capable of performing a method according to the present disclosure;

fig. 3 illustrates another example of a wireless device capable of performing an implementation of the present disclosure;

fig. 4 shows an example of a frame structure used in a 3 rd generation partnership project (3 GPP) based wireless communication system;

fig. 5 illustrates a resource grid of time slots;

fig. 6 illustrates an example of Physical Downlink Shared Channel (PDSCH) time domain resource assignment caused by a Physical Downlink Control Channel (PDCCH) and Physical Uplink Shared Channel (PUSCH) caused by the PDCCH;

fig. 7 illustrates an example of multiplexing Uplink Control Information (UCI) with PUSCH;

fig. 8 illustrates an operational flow of a UE in accordance with some implementations of the present disclosure;

fig. 9 illustrates an example of partial Channel State Information (CSI) reporting in accordance with some implementations of the disclosure;

fig. 10 illustrates another example of partial CSI reporting according to some implementations of the disclosure; and

fig. 11 illustrates an operational flow of a Base Station (BS) according to some implementations of the present disclosure.

Detailed description of the preferred embodiments

Hereinafter, an implementation according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description set forth below with reference to the appended drawings is intended to illustrate exemplary implementations of the present disclosure and is not intended to show the only implementations that can be implemented according to the present disclosure. The following detailed description includes specific details in order to provide a thorough understanding of the present disclosure. It will be apparent, however, to one skilled in the art that the present disclosure may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, focusing on important features of the structures and devices, so as not to obscure the concepts of the present disclosure. The same reference numbers will be used throughout this disclosure to refer to the same or like parts.

The techniques, apparatuses and systems described below may be applied to various wireless multiple access systems. For example, multiple-access systems may include Code Division Multiple Access (CDMA) systems, frequency Division Multiple Access (FDMA) systems, time Division Multiple Access (TDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, multiple carrier frequency division multiple access (MC-FDMA) systems, and so forth. CDMA may be implemented by a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA may be implemented by radio technologies such as global system for mobile communications (GSM), general Packet Radio Service (GPRS), enhanced data rates for GSM evolution (EDGE) (i.e., GERAN), and the like. OFDMA may be embodied by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), and the like. UTRA is part of Universal Mobile Telecommunications System (UMTS), and 3 rd generation partnership project (3 GPP) Long Term Evolution (LTE) is part of E-UMTS using E-UTRA. 3GPP LTE employs OFDMA on the Downlink (DL) and SC-FDMA on the Uplink (UL). LTE-advanced (LTE-a) is an evolved version of 3GPP LTE.

For descriptive convenience, a description will be given under the assumption that the present disclosure is applied to LTE and/or a New RAT (NR). However, technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to the 3GPP LTE/NR system, the mobile communication system is applicable to any other mobile communication system except for matters specific to the 3GPP LTE/NR system.

For terms and techniques not described in detail among terms and techniques used in the present disclosure, reference may be made to 3 GPP-based standard specifications (e.g., 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.300, 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.331, etc.).

In examples of the present disclosure described later, if a device "assumes" something, this may mean that the channel transmitting entity transmits the channel in compliance with the corresponding "assumption". This may also mean that the channel receiving entity receives or decodes the channel in a form conforming to the "hypothesis" in compliance with the "hypothesis" transmitting the channel.

In the present disclosure, a User Equipment (UE) may be fixed or mobile. Each of the various apparatuses that transmit and/or receive user data and/or control information through communication with a Base Station (BS) may be a UE. The term UE may be referred to as a terminal device, mobile Station (MS), mobile Terminal (MT), user Terminal (UT), subscriber Station (SS), wireless device, personal Digital Assistant (PDA), wireless modem, handheld device, etc. In the present disclosure, a BS refers to a fixed station that communicates with a UE and/or another BS and exchanges data and control information with the UE and the other BS. The term BS may be referred to as an Advanced Base Station (ABS), a Node B (NB), an evolved node B (eNB), a Base Transceiver System (BTS), an Access Point (AP), a Processing Server (PS), etc. Specifically, the BS of the Universal Terrestrial Radio Access (UTRAN) is referred to as NB, the BS of the evolved UTRAN (E-UTRAN) is referred to as eNB, and the BS of the new radio access technology network is referred to as gNB. Hereinafter, for convenience of description, regardless of the type or version of the communication technology, NB, eNB or gNB will be referred to as BS.

In the present disclosure, a node refers to a fixed point capable of transmitting/receiving radio signals to/from a UE by communicating with the UE. Regardless of its name, various types of BSs may act as nodes. For example, BS, NB, eNB, a pico cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, etc. may be a node. In addition, the node may not be a BS. For example, a Radio Remote Head (RRH) or a Radio Remote Unit (RRU) may be a node. Typically, the RRHs and RRUs have a lower power level than the BS. Since the RRH or RRU (hereinafter, RRH/RRU) is generally connected to the BS through a dedicated line such as an optical cable, the cooperative communication according to the RRH/RRU and the BS can be smoothly performed as compared with the cooperative communication according to the BS connected through a wireless link. At least one antenna is mounted per node. Antennas may refer to physical antenna ports or to virtual antennas or groups of antennas. Nodes may also be referred to as points.

In this disclosure, a cell refers to a particular geographic area in which one or more nodes provide communication services. Thus, in the present disclosure, communication with a particular cell may mean communication with a BS or node that provides communication services to the particular cell. The DL/UL signal of a specific cell refers to DL/UL signals from/to a BS or node providing communication service for the specific cell. The cell providing UL/DL communication services to the UE is specifically referred to as a serving cell. In addition, the channel state/quality of a specific cell refers to the channel state/quality of a channel or communication link generated between a BS or node providing a communication service to the specific cell and a UE. In a 3 GPP-based communication system, a UE may measure DL channel state from a particular node using cell-specific reference signal (CRS) transmitted on CRS resources and/or channel state information reference signal (CSI-RS) transmitted on CSI-RS resources allocated to the particular node by an antenna port of the particular node.

The 3 GPP-based communication system uses the concept of cells in order to manage radio resources and to distinguish cells related to radio resources from cells of a geographical area.

A "cell" of a geographical area may be understood as a coverage area where a node may use a carrier to provide a service, and a "cell" of radio resources is associated with a Bandwidth (BW) which is a frequency range configured by the carrier. Since DL coverage (the range over which a node can transmit a valid signal) and UL coverage (the range over which a node can receive a valid signal from a UE) depend on the carrier on which the signal is carried, the coverage of a node can also be associated with the coverage of a "cell" of the radio resource used by that node. Thus, the term "cell" may be used to indicate sometimes the service coverage of a node, to indicate radio resources at other times, or to indicate at other times the range reached by a signal using radio resources with an effective strength.

In the 3GPP communication standard, the concept of cells is used in order to manage radio resources. A "cell" associated with radio resources is defined by a combination of DL resources and UL resources, i.e., a combination of DL Component Carriers (CCs) and UL CCs. A cell may be configured by DL resources only or by a combination of DL and UL resources. If carrier aggregation is supported, a link between a carrier frequency of a DL resource (or DL CC) and a carrier frequency of a UL resource (or UL CC) may be indicated by system information. For example, the combination of DL resources and UL resources may be indicated by a system information block type 2 (SIB 2) linkage. In this case, the carrier frequency may be equal to or different from the center frequency of each cell or CC. When Carrier Aggregation (CA) is configured, the UE has only one Radio Resource Control (RRC) connection with the network. During RRC connection setup/re-establishment/handover, one serving cell provides non-access stratum (NAS) mobility information. During RRC connection re-establishment/handover, one serving cell provides security input. This cell is called a primary cell (Pcell). A Pcell refers to a cell operating on a primary frequency where a UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure. Depending on the UE capability, the secondary cell (Scell) may be configured to form a set of serving cells with the Pcell. Scell may be configured after RRC connection establishment is complete and used to provide additional radio resources in addition to resources of a specific cell (SpCell). The carrier corresponding to the Pcell on DL is called a downlink primary CC (DL PCC), and the carrier corresponding to the Pcell on UL is called an uplink primary CC (UL PCC). The carrier corresponding to Scell on DL is referred to as downlink secondary CC (DL SCC), and the carrier corresponding to Scell on UL is referred to as uplink secondary CC (UL SCC).

In Dual Connectivity (DC) operation, the term special cell (SpCell) refers to a Pcell of a primary cell group (MCG) or a Pcell of a primary secondary cell group (PSCell). SpCell supports PUCCH transmission and contention-based random access and is always enabled. The MCG is a set of serving cells associated with a master node (e.g., BS) and includes a SpCell (Pcell) and optionally one or more scells. For a UE configured with DC, the SCG is a subset of serving cells associated with the secondary node and includes PSCell and 0 or more scells. PSCell is the primary Scell of SCG. For UEs in rrc_connected state that are not configured with CA or DC, there is only one serving cell including only Pcell. For a UE in rrc_connected state, configured with CA or DC, the term serving cell refers to the set of cells including SpCell and all scells. In DC, two Medium Access Control (MAC) entities are configured for the UE, i.e., one MAC entity for the MCG and one MAC entity for the SCG.

For a UE configured with CA and not configured with DC, a Pcell PUCCH group (also referred to as a primary PUCCH group) including Pcell and 0 or more scells and a Scell PUCCH group (also referred to as a secondary PUCCH group) including only scells may be configured. For Scell, a Scell (hereinafter, PUCCH cell) on which PUCCH associated with a corresponding cell is transmitted may be configured. The Scell indicating the PUCCH Scell belongs to the Scell PUCCH group (i.e., the secondary PUCCH group), and PUCCH transmission of related Uplink Control Information (UCI) is performed on the PUCCH Scell. If no PUCCH Scell is indicated for the Scell or the cell indicated for PUCCH transmission of the Scell is a Pcell, the Scell belongs to a Pcell PUCCH group (i.e., a primary PUCCH group) and PUCCH transmission of the related UCI is performed on the Pcell. Hereinafter, if the UE is configured with an SCG and some implementations of the present disclosure related to PUCCH are applied to the SCG, the primary cell may refer to a PSCell of the SCG. If the UE is configured with a PUCCH Scell, and some implementations of the present disclosure related to PUCCH are applied to the secondary PUCCH group, the primary cell may refer to the PUCCH Scell of the secondary PUCCH group.

In a wireless communication system, a UE receives information from a BS on DL and the UE transmits information to the BS on UL. The information transmitted and/or received by the BS and the UE includes data and various control information, and there are various physical channels according to the type/purpose of the information transmitted and/or received by the UE and the BS.

The 3 GPP-based communication standard defines DL physical channels corresponding to resource elements carrying information originating from higher layers and DL physical signals corresponding to resource elements used by the physical layer but not carrying information originating from higher layers. For example, a Physical Downlink Shared Channel (PDSCH), a Physical Broadcast Channel (PBCH), a Physical Multicast Channel (PMCH), a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and the like are defined as DL physical channels, and a Reference Signal (RS) and a Synchronization Signal (SS) are defined as DL physical signals. The RS (also called pilot) represents a signal with a predefined special waveform known to both BS and UE. For example, demodulation reference signals (DMRS), channel state information RS (CSI-RS), and the like are defined as DL RS. The 3 GPP-based communication standard defines UL physical channels corresponding to resource elements carrying information originating from higher layers and UL physical signals corresponding to resource elements used by the physical layer but not carrying information originating from higher layers. For example, a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), and a Physical Random Access Channel (PRACH) are defined as UL physical channels, and DMRS for UL control/data signals, sounding Reference Signals (SRS) for UL channel measurement, and the like are defined.

In this disclosure, PDCCH refers to a set of time-frequency resources (e.g., resource Elements (REs)) that carry Downlink Control Information (DCI), and PDSCH refers to a set of time-frequency resources that carry DL data. PUCCH, PUSCH and PRACH refer to a set of time-frequency resources carrying UCI, a set of time-frequency resources carrying UL data, and a set of time-frequency resources carrying a random access signal, respectively. In the following description, "UE transmits/receives PUCCH/PUSCH/PRACH" is used as the same meaning that the UE transmits/receives UCI/UL data/random access signal on or through PUCCH/PUSCH/PRACH, respectively. In addition, "BS transmits/receives PBCH/PDCCH/PDSCH" is used as the same meaning that the BS transmits broadcast information/DCI/DL data on or through PBCH/PDCCH/PDSCH, respectively.

In the present disclosure, radio resources (e.g., time-frequency resources) scheduled or configured by a BS for a UE to transmit or receive PUCCH/PUSCH/PDSCH may be referred to as PUCCH/PUSCH/PDSCH resources.

Since the communication device receives a Synchronization Signal Block (SSB), DMRS, CSI-RS, PBCH, PDCCH, PDSCH, PUSCH, and/or PUCCH in the form of a radio signal on a cell, the communication device may not select and receive a radio signal including only a specific physical channel or a specific physical signal through a Radio Frequency (RF) receiver or may not select and receive a radio signal without a specific physical channel or a specific physical signal through an RF receiver. In practice, the communication device receives radio signals on a cell via an RF receiver, converts the radio signals as RF band signals to baseband signals, and then decodes physical signals and/or physical channels in the baseband signals using one or more processors. Thus, in some implementations of the present disclosure, receiving a physical signal and/or physical channel may mean that the communication device does not attempt to recover the physical signal and/or physical channel from the radio signal, e.g., does not attempt to decode the physical signal and/or physical channel, but that the non-communication device does not actually receive the radio signal including the corresponding physical signal and/or physical channel.

As more and more communication devices require greater communication capacity, eMBB communication with respect to the conventional Radio Access Technology (RAT) is required. In addition, large-scale MTC, which provides various services anytime and anywhere by connecting a plurality of devices and objects to each other, is one of the main problems to be considered in next-generation communication. In addition, communication system designs that consider reliability and delay sensitive services/UEs are also being discussed. Considering eMBB communication, large-scale MTC, ultra-reliable low latency communication (URLLC), etc., the introduction of next generation RATs is being discussed. Currently, in 3GPP, research on the next generation mobile communication system after EPC is underway. In the present disclosure, for convenience, the corresponding technology is referred to as a New RAT (NR) or a fifth generation (5G) RAT, and a system using NR or supporting NR is referred to as an NR system.

Fig. 1 shows an example of a communication system 1 to which an implementation of the present disclosure is applied. Referring to fig. 1, a communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. Here, a wireless device means a device that performs communication using a RAT (e.g., 5G NR or LTE (e.g., E-UTRA)) and may be referred to as a communication/radio/5G device. Wireless devices may include, but are not limited to, robots 100a, vehicles 100b-1 and 100b-2, augmented reality (XR) devices 100c, handheld devices 100d, home appliances 100e, internet of things (IoT) devices 100f, and Artificial Intelligence (AI) devices/servers 400. For example, the vehicle may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., an unmanned aerial vehicle). XR devices may include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices, and may be implemented in the form of head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, and the like. The handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may also be implemented as wireless devices, and a particular wireless apparatus may operate as a BS/network node with respect to another wireless device.

The wireless devices 100a to 100f may connect to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communications (e.g., vehicle-to-vehicle (V2V)/vehicle-to-anything (V2X) communications). The IoT devices (e.g., sensors) may perform direct communications with other IoT devices (e.g., sensors) or other wireless devices 100 a-100 f.

Wireless communication/connections 150a and 150b may be established between wireless devices 100 a-100 f and BS200, as well as between wireless devices 100 a-100 f. Here, wireless communications/connections such as UL/DL communications 150a and side link communications 150b (or device-to-device (D2D) communications) may be established over various RATs (e.g., 5G NR). The wireless device and BS/wireless device may transmit/receive radio signals to/from each other through wireless communication/connections 150a and 150b. To this end, at least a part of various configuration information configuration procedures for transmitting/receiving radio signals, various signal processing procedures (e.g., channel coding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocation procedures may be performed based on various proposals of the present disclosure.

Fig. 2 is a block diagram illustrating an example of a communication device capable of performing a method according to the present disclosure. Referring to fig. 2, the first wireless device 100 and the second wireless device 200 may transmit and/or receive radio signals through various RATs (e.g., LTE and NR). Here, { first wireless device 100 and second wireless device 200} may correspond to { wireless device 100x and BS200} and/or { wireless device 100x and wireless device 100x } of fig. 1.

The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and/or one or more antennas 108. The processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the functions, processes and/or methods described/suggested below. For example, the processor 102 may process the information within the memory 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver 106. The processor 102 may receive a radio signal including the second information/signal through the transceiver 106 and then store information obtained by processing the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may execute some or all of the processes controlled by the processor 102 or store software code including commands for performing the processes and/or methods described/suggested below. Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be coupled to the processor 102 and transmit and/or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a Radio Frequency (RF) unit. In this disclosure, a wireless device may represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and/or one or more antennas 208. The processor 202 may control the memory 204 and/or the transceiver 206 and may be configured to implement the functions, processes and/or methods described/suggested below. For example, the processor 202 may process the information within the memory 204 to generate a third information/signal and then transmit a radio signal including the third information/signal through the transceiver 206. The processor 202 may receive a radio signal including the fourth information/signal through the transceiver 206 and then store information obtained by processing the fourth information/signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may execute some or all of the processes controlled by the processor 202 or store software code including commands for executing the processes and/or methods described/presented below. Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and/or receive radio signals through one or more antennas 208. Each transceiver 206 can include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with RF unit. In this disclosure, a wireless device may represent a communication modem/circuit/chip.

Wireless communication techniques implemented in wireless devices 100 and 200 of the present disclosure may include narrowband internet of things for low power communications as well as LTE, NR, and 6G communications. For example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented by, but is not limited to, standards such as LTE Cat NB1 and/or LTE Cat NB 2. Additionally or alternatively, wireless communication techniques implemented in wireless devices XXX and YYY of the present disclosure may perform communication based on LTE-M techniques. For example, LTE-M technology may be an example of LPWAN technology, and may be referred to by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented by (but is not limited to) at least one of a variety of standards, such as: 1) LTE CAT 0, 2) LTE CAT M1, 3) LTE CAT M2, 4) LTE non-BL (non-bandwidth limited), 5) LTE-MTC, 6) LTE machine-type communications, and/or 7) LTE M. Additionally or alternatively, in view of low power communications, the wireless communication techniques implemented in wireless devices XXX and YYY of the present disclosure may include, but are not limited to, at least one of ZigBee, bluetooth, and Low Power Wide Area Network (LPWAN). For example, zigBee technology can create Personal Area Networks (PANs) related to small/low power digital communication based on various standards such as IEEE 802.15.4, and can be referred to by various names.

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as a Physical (PHY) layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Resource Control (RRC) layer, and a Service Data Adaptation Protocol (SDAP) layer). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the functions, procedures, proposals, and/or methods disclosed in the present disclosure. One or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the functions, processes, proposals, and/or methods disclosed in the present disclosure. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and/or methods disclosed in the present disclosure, and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and/or methods disclosed in the present disclosure.

One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The functions, processes, proposals and/or methods disclosed in the present disclosure may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes or functions. Firmware or software configured to perform the functions, processes, proposals and/or methods disclosed in the present disclosure may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 to be driven by the one or more processors 102 and 202. The functions, procedures, proposals and/or methods disclosed in the present disclosure may be implemented in the form of codes, commands and/or command sets using firmware or software.

One or more memories 104 and 204 may be coupled to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, commands, and/or instructions. One or more of the memories 104 and 204 may be configured by read-only memory (ROM), random-access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, a hard drive, registers, a cache memory, a computer-readable storage medium, and/or combinations thereof. The one or more memories 104 and 204 may be located internal and/or external to the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 by various techniques, such as a wired or wireless connection.

One or more transceivers 106 and 206 may transmit the user data, control information, and/or radio signals/channels referred to in the methods and/or operational flow diagrams of the present disclosure to one or more other devices. One or more transceivers 106 and 206 may receive the user data, control information, and/or radio signals/channels mentioned in the functions, processes, proposals, methods, and/or operational flowcharts disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. The one or more transceivers 106 and 206 may be configured to transmit and receive the user data, control information, and/or radio signals/channels referred to in the functions, processes, proposals, methods, and/or operational flowcharts disclosed in the present disclosure through the one or more antennas 108 and 208. In the present disclosure, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels, etc., from RF band signals to baseband signals for processing received user data, control information, radio signals/channels, etc., using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc., processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and/or filters.

Fig. 3 illustrates another example of a wireless device capable of performing implementations of the present disclosure. Referring to fig. 3, wireless devices 100 and 200 may correspond to wireless devices 100 and 200 of fig. 2 and may be configured by various elements, components, units/portions, and/or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 of fig. 2. For example, transceiver 114 may include one or more transceivers 106 and 206 and/or one or more antennas 108 and 208 of fig. 2. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on programs/codes/commands/information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless/wired interface.

The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit/battery, an input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented as, but is not limited to, a robot (100 a of fig. 1), a vehicle (100 b-1 and 100b-2 of fig. 1), an XR device (100 c of fig. 1), a handheld device (100 d of fig. 1), a home appliance (100 e of fig. 1), an IoT device (100 f of fig. 1), a digital broadcast UE, a holographic device, a public safety device, an MTC device, a medical device, a financial technology device (or a financial device), a security device, a climate/environment device, an AI server/device (400 of fig. 1), a BS (200 of fig. 1), a network node, and the like. Wireless devices may be used in mobile or stationary locations depending on the use/service.

In fig. 3, the various elements, components, units/portions and/or modules in wireless devices 100 and 200 may all be connected to each other through wired interfaces, or at least a portion thereof may be connected wirelessly through communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire, and the control unit 120 and the first unit (e.g., 130 and 140) may be connected wirelessly through the communication unit 110. The various elements, components, units/portions and/or modules within wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory 130 may be configured by Random Access Memory (RAM), dynamic RAM (DRAM), read Only Memory (ROM)), flash memory, volatile memory, non-volatile memory, and/or combinations thereof.

In the present disclosure, at least one memory (e.g., 104 or 204) may store instructions or programs that, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations in accordance with some embodiments or implementations of the present disclosure.

In the present disclosure, a computer-readable (non-transitory) storage medium may store at least one instruction or program, and the at least one instruction or program, when executed by at least one processor, may cause the at least one processor to perform operations according to some embodiments or implementations of the present disclosure.

In the present disclosure, a processing apparatus or device may include at least one processor and at least one computer memory operatively connected to the at least one processor. The at least one computer memory may store instructions or programs that, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations in accordance with some embodiments or implementations of the present disclosure.

In the present disclosure, a computer program may include program code stored on at least one computer-readable (non-volatile) storage medium and which, when executed, is configured to perform operations in accordance with or cause at least one processor to perform operations in accordance with some implementations of the present disclosure. The computer program may be provided in the form of a computer program product. The computer program product may include at least one computer-readable (non-volatile) storage medium.

The communication device of the present disclosure includes: at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations according to examples of the disclosure described later.

Fig. 4 shows an example of a frame structure used in a 3 GPP-based wireless communication system.

The frame structure of fig. 4 is merely exemplary, and the number of subframes, the number of slots, and the number of symbols in a frame may be variously changed. In an NR system, different sets of OFDM parameters (e.g., subcarrier spacing (SCS)) may be configured for a plurality of cells aggregated for one UE. Thus, the (absolute time) duration of a time resource comprising the same number of symbols (e.g. subframes, slots or Transmission Time Intervals (TTIs)) may be configured differently for the aggregated cells. Here, the symbols may include OFDM symbols (or cyclic prefix-OFDM (CP-OFDM) symbols) and SC-FDMA symbols (or discrete fourier transform-spread-OFDM (DFT-s-OFDM) symbols). In this disclosure, symbols, OFDM-based symbols, OFDM symbols, CP-OFDM symbols, and DFT-s-OFDM symbols are used interchangeably.

Referring to fig. 4, in the NR system, UL transmission and DL transmission are organized into frames. Each frame has T _f ＝(△f _max *N _f /100)*T _c Time duration=10 ms and is divided into two half frames of 5ms each. The basic unit of time for NR is T _c ＝1/(△f _max *N _f ) Wherein Δf _max ＝480*10 ³ Hz and N _f =4096. For reference, the basic time unit of LTE is T _s ＝1/(△f _ref *N _f,ref ) Wherein Δf _ref ＝15*10 ₃ Hz and N _f,ref ＝2048。T _c And T _f With a constant k=t _c /T _f A relation of=64. Each half frame includes 5 subframes, and the duration T of a single subframe _sf 1ms. The subframe is further divided into slots, and the number of slots in the subframe depends on the subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on a cyclic prefix. In the normal CP, each slot includes 14 OFDM symbols, and in the extended CP, each slot includes 12 OFDM symbols. The parameter set depends on the exponentially scalable subcarrier spacing Δf=2 ^u *15kHz. The following table shows the number of OFDM symbols per slot (N ^slot _symb ) Number of slots per frame (N ^frame，u _slot ) And the number of slots per subframe (N ^subframe，u _slot )。

TABLE 1

u	N ^slot _symb	N ^frame，u _slot	N ^subframe，u _slot
				0	14	10	1
1	14	20	2
				2	14	40	4
3	14	80	8
				4	14	160	16

The following table shows the subcarrier spacing Δf=2 ^u *15kHz, the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe.

TABLE 2

u	N ^slot _symb	N ^frame，u _slot	N ^subframe，u _slot
				2	12	40	4

For subcarrier spacing configuration u, the slots may be indexed in ascending order within a subframe as follows: n is n ^u _s ∈{0，...，n ^subframe ^，u _slot -1}, and indexed in ascending order within the frame as follows: n is n ^u _s，f ∈{0，...，n ^frame，u _slot -1}。

Fig. 5 shows a resource grid of time slots. A slot includes a plurality of (e.g., 14 or 12) symbols in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, from a Common Resource Block (CRB) N indicated by higher layer signaling (e.g., RRC signaling) ^start，u _grid Start defining N ^size，u _grid，x *N ^RB _sc Sub-carriers and N ^subframe，u _symb Resource grid of OFDM symbols, where N ^size，u _grid，x Is the number of Resource Blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink. N (N) ^RB _sc Is the number of subcarriers per RB. In a 3GPP based wireless communication system, N ^RB _sc Typically 12. For a pair ofThere is one resource grid for a given antenna port p, subcarrier spacing configuration u and transmission link (DL or UL). The carrier bandwidth N of the subcarrier spacing configuration u is given to the UE by higher layer parameters (e.g., RRC parameters) ^size，u _grid . Each element in the resource grid for the antenna port p and the subcarrier spacing configuration u is referred to as a Resource Element (RE), and one complex symbol may be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing a symbol position relative to a reference point in the time domain. In the NR system, RBs are defined by 12 consecutive subcarriers in the frequency domain. In the NR system, RBs are classified into CRBs and Physical Resource Blocks (PRBs). For subcarrier spacing configuration u, the CRB is numbered from 0 upward in the frequency domain. The center of subcarrier 0 of CRB 0 of subcarrier spacing configuration u is equal to "point a" serving as a common reference point of the RB grid. PRBs for subcarrier spacing configuration u are defined in a bandwidth part (BWP) and range from 0 to N ^size,u _BWP,i -1 number, where i is the number of BWP. PRB n in BWP i _PRB And CRB n ^u _CRB The relation between is represented by n ^u _PRB ＝n ^u _CRB +N ^size,u _BWP,i Given, where N ^size _BWP,i Is the CRB where BWP starts with respect to CRB 0. BWP comprises a plurality of consecutive RBs in the frequency domain. For example, BWP may be a given parameter set u in BWP i on a given carrier _i A subset of defined contiguous CRBs. The carrier may include a maximum of N (e.g., 5) BWPs. The UE may be configured with one or more BWPs on a given component carrier. Data communication is performed through the enabled BWP, and only a predetermined number of BWP (e.g., one BWP) among the BWP configured for the UE on the component carrier may be active.

For each serving cell in the set of DL BWP or UL BWP, the network may configure at least the initial DL BWP and one (if the serving cell is configured with an uplink) or two (if a supplemental uplink is used) initial UL BWP. The network may configure additional UL and DL BWP. For each DL BWP or UL BWP, the following parameters may be provided to the UE for the serving cell: i) SCS (SCS); ii) CP; iii) From at N ^start _BWP＝ 275 under assumption indicationOffset RB _set And length L _RB CRB N provided as RRC parameter locationBandWidth of Resource Indicator Value (RIV) ^start _BWP ＝O _carrier +RB _start And the number N of contiguous RBs ^size _BWP ＝L _RB And a value O provided by RRC parameter offsettopcarrier for SCS _carrier The method comprises the steps of carrying out a first treatment on the surface of the Index in the set of DL BWP or UL BWP; a set of BWP common parameters; and a set of BWP-specific parameters.

Virtual Resource Blocks (VRBs) may be defined within BWP and from 0 to N ^size,u _BWP,i -1 index, wherein i denotes BWP number. VRBs may be mapped to PRBs according to a non-interleaved mapping. In some implementations, for non-interleaved VRB-to-PRB mapping, VRB n may be mapped to PRB n.

A UE configured with carrier aggregation may be configured to use one or more cells. If the UE is configured with multiple serving cells, the UE may be configured with one or more cell groups. The UE may also be configured with multiple cell groups associated with different BSs. Alternatively, the UE may be configured with multiple cell groups associated with a single BS. Each cell group of the UE includes one or more serving cells and includes a single PUCCH cell configuring PUCCH resources. The PUCCH cell may be Scell configured as a PUCCH cell among Pcell or scells of corresponding cell groups. Each serving cell of the UE belongs to one of the cell groups of the UE and does not belong to multiple cells.

The NR frequency band is defined as two types of frequency ranges, FR1 and FR2.FR2 is also known as millimeter wave (mmW). The following table shows the frequency range over which NR can operate.

TABLE 3

Frequency range assignment	Corresponding frequency range	Subcarrier spacing
			FR1	410MHz-7125MHz	15、30、60kHz
FR2	24250MHz-52600MHz	60、120、240kHz

Hereinafter, physical channels usable in the 3 GPP-based wireless communication system will be described in detail.

The PDCCH carries DCI. For example, the PDCCH (i.e., DCI) carries information on a transport format and resource allocation of a downlink shared channel (DL-SCH), information on resource allocation of an uplink shared channel (UL-SCH), paging information on a Paging Channel (PCH), system information on the DL-SCH, information on resource allocation of a control message (e.g., a Random Access Response (RAR) transmitted on a PDSCH) of a higher layer (hereinafter, higher layer) among protocol stacks of the UE/BS than a physical layer, transmission power control command, information on activation/deactivation of a Configuration Scheduling (CS), and the like. The DCI including information on resource allocation of the DL-SCH is referred to as PDSCH scheduling DCI, and the DCI including information on resource allocation of the UL-SCH is referred to as PUSCH scheduling DCI. The DCI includes a Cyclic Redundancy Check (CRC). The CRC is masked/scrambled with various identifiers, e.g., a Radio Network Temporary Identifier (RNTI), according to the owner and purpose of the PDCCH. For example, if the PDCCH is for a particular UE, the CRS is masked with a UE identifier (e.g., cell-RNTI (C-RNTI)). If the PDCCH is used for a paging message, the CRC is masked with a paging RNTI (P-RNTI). If the PDCCH is used for system information (e.g., a System Information Block (SIB)), the CRC is masked with a system information RNTI (SI-RNTI). If the PDCCH is used for a random access response, the CRC is masked with a random access-RNTI (RA-RNTI).

When a PDCCH on one serving cell schedules a PDSCH or PUSCH on another serving cell, it is referred to as cross-carrier scheduling. Cross-carrier scheduling with Carrier Indicator Field (CIF) may allow PDCCH on a serving cell to schedule resources on another serving cell. When PDSCH on a serving cell schedules PDSCH or PUSCH on the serving cell, it is referred to as self-carrier scheduling. When cross-carrier scheduling is used in a cell, the BS may provide information about the cell of the scheduling cell to the UE. For example, the BS may inform the UE whether the serving cell is scheduled by a PDCCH on another (scheduling) cell or by the serving cell. If the serving cell is scheduled by another (scheduling) cell, the BS may signal to the UE which cell signals DL assignment and UL grant of the serving cell. In the present disclosure, a cell carrying a PDCCH is referred to as a scheduling cell, and a cell in which transmission of a PUSCH or PDSCH is scheduled by DCI included in the PDCCH (i.e., a cell carrying a PUSCH or PDSCH scheduled by the PDCCH) is referred to as a scheduled cell.

PDSCH is a physical layer UL channel for UL data transmission. PDSCH carries DL data (e.g., DL-SCH transport blocks) and is subject to modulation such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64QAM, 256QAM, etc. The codeword is generated by encoding a Transport Block (TB). PDSCH may carry a maximum of two codewords. Scrambling and modulation mapping per codeword may be performed and modulation symbols generated from the respective codewords may be mapped to one or more layers. The respective layers are mapped to radio resources together with DMRS and generated as OFDM symbol signals. Then, the OFDM symbol signal is transmitted through the corresponding antenna port.

The PUCCH means a physical layer UL channel for Uplink Control Information (UCI) transmission. The PUCCH carries UCI. The UCI type transmitted on the PUCCH may include hybrid automatic repeat request acknowledgement (HARQ-ACK) information, scheduling Request (SR), and Channel State Information (CSI). UCI bits may include HARQ-ACK information bits, if any, SR information bits, if any, link Recovery Request (LRR) information bits, if any, and CSI bits, if any. In the present disclosure, the HARQ-ACK information bits may correspond to a HARQ-ACK codebook. In particular, a bit sequence in which HARQ-ACK information bits are arranged according to a predetermined rule is called a HARQ-ACK codebook.

-a Scheduling Request (SR): information for requesting UL-SCH resources.

-hybrid automatic repeat request (HARQ) -Acknowledgement (ACK): response to DL data packets (e.g., codewords) on PDSCH. The HARQ-ACK indicates whether the communication device successfully received the DL data packet. In response to a single codeword, a 1-bit HARQ-ACK may be transmitted. In response to the two codewords, a 2-bit HARQ-ACK may be transmitted. The HARQ-ACK response includes a positive ACK (abbreviated ACK), a Negative ACK (NACK), discontinuous Transmission (DTX), or NACK/DTX. Here, the term HARQ-ACK may be used interchangeably with HARQ ACK/NACK, or a/N.

-Channel State Information (CSI): feedback information about DL channels. The CSI may include Channel Quality Information (CQI), a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), a CSI-RS resource indicator (CRI), an SS/PBCH resource block indicator (SSBRI), and a layer indicator (L1). CSI may be classified into CSI part 1 and CSI part 2 according to UCI types included in CSI. For example, CRI, RI, and/or CQI of the first codeword may be included in CSI part 1, and LI, PMI, and/or CQI of the second codeword may be included in CSI part 2.

-Link Recovery Request (LRR):

in the present disclosure, PUCCH resources configured/indicated by the BS for/to the UE for HARQ-ACK, SR, and CSI transmission are referred to as HARQ-ACK PUCCH resources, SR PUCCH resources, and CSI PUCCH resources, respectively, for convenience.

The PUCCH format may be defined as follows according to UCI payload size and/or transmission length (e.g., the number of symbols included in the PUCCH resource). For PUCCH formats, reference may also be made to table 4.

(0) PUCCH format 0 (PF 0 or F0)

Supported UCI payload size: up to K bits (e.g., k=2)

-number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., x=2)

-a transmission structure: only UCI signals are included in PUCCH format 0 without DMRS. The UE transmits UCI status by selecting and transmitting one of a plurality of sequences. For example, the UE transmits a specific UCI to the BS by transmitting one of a plurality of sequences through PUCCH (PUCCH format 0). The UE transmits PUCCH (PUCCH format 0) in PUCCH resources for a corresponding SR configuration only when transmitting a positive SR.

The configuration of PUCCH format 0 includes the following parameters for the corresponding PUCCH resource: an index of the initial cyclic shift, a number of symbols for PUCCH transmission, and/or a first symbol for PUCCH transmission.

(1) PUCCH format 1 (PF 1 or F1)

Supported UCI payload size: up to K bits (e.g., k=2)

-number of OFDM symbols constituting a single PUCCH: y to Z symbols (e.g., y=4 and z=14)

-a transmission structure: DMRS and UCI are configured/mapped in TDM to different OFDM symbols. In other words, the DMRS is transmitted in a symbol in which a modulation symbol is not transmitted, and UCI is represented as a product between a specific sequence (e.g., orthogonal Cover Code (OCC)) and a modulation (e.g., QPSK) symbol. Code Division Multiplexing (CDM) is supported between multiple PUCCH resources (conforming to PUCCH format 1) (within the same RB) by applying Cyclic Shift (CS)/OCC to both UCI and DMRS. PUCCH format 1 carries UCI of at most 2 bits and spreads modulation symbols in the time domain by OCC (differently configured according to whether frequency hopping is performed).

The configuration of PUCCH format 1 includes the following parameters for the corresponding PUCCH resource: an index of an initial cyclic shift, a number of symbols for PUCCH transmission, a first symbol for PUCCH transmission, and/or an index of OCC.

(2) PUCCH format 2 (PF 2 or F2)

Supported UCI payload size: over K bits (e.g., k=2)

-number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., x=2)

-a transmission structure: DMRS and UCI are configured/mapped using Frequency Division Multiplexing (FDM) within the same symbol. The UE transmits UCI by applying IFFT to the encoded UCI bits without DFT. PUCCH format 2 carries UCI of a bit size larger than K bits, and the modulation symbols are subjected to FDM with DMRS for transmission. For example, DMRS is located in symbol indexes #1, #4, #7, and #10 within a given RB with a density of 1/3. A Pseudo Noise (PN) sequence is used for the DMRS sequence. Frequency hopping may be enabled for 2-symbol PUCCH format 2.

The configuration of PUCCH format 2 includes the following parameters for the corresponding PUCCH resource: the number of PRBs, the number of symbols used for PUCCH transmission, and/or the first symbol used for PUCCH transmission.

(3) PUCCH format 3 (PF 3 or F3)

Supported UCI payload size: over K bits (e.g., k=2)

-a transmission structure: DMRS and UCI are configured/mapped to different OFDM symbols in TDM. The UE transmits UCI by applying DFT to the encoded UCI bits. PUCCH format 3 does not support UE multiplexing for the same time-frequency resource (e.g., the same PRB).

The configuration of PUCCH format 3 includes the following parameters for the corresponding PUCCH resource: the number of PRBs, the number of symbols used for PUCCH transmission, and/or the first symbol used for PUCCH transmission.

(4) PUCCH format 4 (PF 4 or F4)

Supported UCI payload size: over K bits (e.g., k=2)

-a transmission structure: DMRS and UCI are configured/mapped to different OFDM symbols in TDM. PUCCH format 4 may be multiplexed into up to 4 UEs in the same PRB by applying OCC at the front end of DFT and CS (or Interleaved FDM (IFDM) mapping) to DMRS. In other words, the modulation symbols of UCI undergo TDM with DMRS for transmission.

The configuration of PUCCH format 4 includes the following parameters for the corresponding PUCCH resource: the number of symbols for PUCCH transmission, the length of the OCC, the index of the OCC, and the first symbol for PUCCH transmission.

The following table shows PUCCH formats. The PUCCH formats may be divided into short PUCCH formats (formats 0 and 2) and long PUCCH formats (formats 1, 3 and 4) according to PUCCH transmission lengths.

TABLE 4

PUCCH resources may be determined according to UCI type (e.g., a/N, SR or CSI). PUCCH resources for UCI transmission may be determined based on UCI (payload) size. For example, the BS may configure a plurality of PUCCH resource sets for the UE, and the UE may select a specific PUCCH resource set corresponding to a specific range according to a range (e.g., UCI bit number) of UCI (payload) size. For example, the UE may select one of the following PUCCH resource sets according to the UCI bit number NUCI.

PUCCH resource set #0 if UCI number of bits= <2

PUCCH resource set #1 if 2< uci bit number= < N1

...

-PUCCH resource set # (K-1), if NK-2< uci bit number= < NK-1

Here, K represents the number of PUCCH resource sets (K > 1), and Ni represents the maximum UCI bit number supported by PUCCH resource set #i. For example, PUCCH resource set #1 may include resources of PUCCH formats 0 to 1, and the other PUCCH resource sets may include resources of PUCCH formats 2 to 4 (see table 4).

The configuration of each PUCCH resource includes a PUCCH resource index, a starting PRB index, and a configuration of one of PUCCH formats 0 to 4. The BS configures a code rate for multiplexing HARQ-ACK, SR and CSI report within PUCCH transmission using PUCCH format 2, PUCCH format 3 or PUCCH format 4 to the UE through higher layer parameter maxCodeRate. The higher layer parameter maxCodeRate is used to determine how to feedback UCI on PUCCH resources of PUCCH formats 2, 3 or 4.

If the UCI type is SR and CSI, PUCCH resources to be used for UCI transmission in the PUCCH resource set may be configured for the UE through higher layer signaling (e.g., RRC signaling). If the UCI type is HARQ-ACK of a semi-persistent scheduling (SPS) PDSCH, PUCCH resources in the PUCCH resource set to be used for UCI transmission may be configured for the UE through higher layer signaling (e.g., RRC signaling). On the other hand, if the UCI type is HARQ-ACK for PDSCH scheduled by DCI, PUCCH resources to be used for UCI transmission in the PUCCH resource set may be scheduled by DCI.

In the case of DCI-based PUCCH resource scheduling, the BS may transmit DCI to the UE on the PDCCH and indicate PUCCH resources to be used for UCI transmission in a specific PUCCH resource set through an ACK/NACK resource indicator (ARI) in the DCI. The ARI may be used to indicate PUCCH resources for ACK/NACK transmission and is also referred to as a PUCCH Resource Indicator (PRI). Here, DCI may be used for PDSCH scheduling and UCI may include HARQ-ACK for PDSCH. The BS may configure a PUCCH resource set including a greater number of PUCCH resources than the ARI can represent for the UE through (UE-specific) higher layer (e.g., RRC) signaling. The ARI may indicate PUCCH resource subsets of the PUCCH resource set, and which PUCCH resource of the indicated PUCCH resource subsets to use may be determined according to an implicit rule based on transmission resource information (e.g. starting CCE index of PDCCH) on the PDCCH.

For UL-SCH data transmission, the UE should include UL resources available to the UE, and for DL-SCH data reception, the UE should include DL resources available to the UE. The BS assigns UL resources and DL resources to the UE through resource allocation. The resource allocations may include Time Domain Resource Allocation (TDRA) and Frequency Domain Resource Allocation (FDRA). In this disclosure, UL resource allocation is also referred to as UL grant, and DL resource allocation is referred to as DL assignment. UL grants are received dynamically by the UE on PDCCH or in RAR, or semi-permanently configured by BS for the UE through RRC signaling. The DL assignment is received dynamically by the UE on the PDCCH or semi-permanently configured for the UE by the BS through RRC signaling.

On the UL, the BS may dynamically allocate UL resources to the UE through a PDCCH addressed to a cell radio network temporary identifier (C-RNTI). The UE monitors the PDCCH to find possible UL grants for UL transmissions. The BS may allocate UL resources to the UE using the configuration grant. Two types of configuration permissions, type 1 and type 2, may be used. In type 1, the BS directly provides the configured UL grant (including periodicity) through RRC signaling. In type 2, the BS may configure the periodicity of RRC configuration UL grants through RRC signaling, and signal, enable, or disable the configured UL grants through PDCCH addressed to the configuration scheduling RNTI (CS-RNTI). For example, in type 2, the PDCCH addressed to the CS-RNTI indicates that the corresponding UL grant may be implicitly reused according to the periodicity configured through RRC signaling until deactivated.

On DL, the BS may dynamically allocate DL resources to the UE through a PDCCH addressed to the C-RNTI. The UE monitors the PDCCH to find possible DL grants. The BS may allocate DL resources to the UE using SPS. The BS may configure the periodicity of the configured DL assignment through RRC signaling and signal, enable, or disable the configured DL assignment through PDCCH addressed to the CS-RNTI. For example, the PDCCH addressed to the CS-RNTI indicates that the corresponding DL assignment can be implicitly reused according to the periodicity configured through RRC signaling until deactivated.

Hereinafter, resource allocation through the PDCCH and resource allocation through the RRC will be described in more detail.

* Resource allocation by PDCCH: dynamic licensing/assignment

The PDCCH may be used to schedule DL transmissions on PDSCH and UL transmissions on PUSCH. The DCI on the PDCCH for scheduling DL transmissions may include DL resource assignments including at least modulation and coding formats (e.g., modulation and Coding Scheme (MCS)) index IMCS, resource allocation, and HARQ information associated with the DL-SCH. The DCI on the PDCCH for scheduling UL transmission may include UL scheduling grant including at least modulation and coding format, resource allocation, and HARQ information associated with the UL-SCH. The HARQ information about the DL-SCH or UL-SCH may include a new information indicator (NDI), a Transport Block Size (TBS), a Redundancy Version (RV), and a HARQ process ID (i.e., HARQ process number). The size and purpose of DCI carried by one PDCCH differ according to DCI formats. For example, DCI format 0_0, DCI format 0_1, or DCI format 0_2 may be used to schedule PUSCH, and DCI format 1_0, DCI format 1_1, or DCI format 1_2 may be used to schedule PDSCH. Specifically, DCI format 0_2 and DCI format 1_2 may be used to schedule a transmission having higher transmission reliability and lower delay requirements than the transmission reliability and delay requirements guaranteed by DCI format 0_0, DCI format 0_1, DCI format 1_0, or DCI format 1_1. Some implementations of the present disclosure may be applied to UL data transmission based on DCL format 0_2. Some implementations of the present disclosure may be applied to DL data reception based on DCI format 1_2.

Fig. 7 shows an example of PDSCH TDRA caused by PDCCH and an example of PUSCH TDRA caused by PDCCH.

The DCI carried by the PDCCH to schedule the PDSCH or PUSCH includes a TDRA field. The TDRA field provides a value m of a row index m+1 for an allocation table of PDSCH or PUSCH. The predefined default PDSCH time domain allocation is applied as an allocation table of PDSCH, or the BS is applied as an allocation table of PDSCH through PDSCH TDRA table configured by RRC signal PDSCH-timedomainalllocation list. The predefined default PUSCH time domain allocation is applied as an allocation table of PUSCH, or the BS applies as an allocation table of PUSCH through PUSCH TDRA table configured by RRC signal PUSCH-timedomainalllocation list. The PDSCH TDRA table to be applied and/or the PUSCH TDRA table to be applied may be determined according to fixed/predefined rules (e.g. with reference to 3gpp TS 38.214).

In PDSCH time domain resource configuration, each index row defines DL assignments and PDSCH slot offsets K ₀ The starting and length indicator values SLIV (or starting position (e.g., starting symbol index S) and allocation length (e.g., number of symbols L)) of PDSCH in a direct slot), and PDSCH mapping type. In PUSCH time domain resource configuration, each index row defines UL grant and PUSCH slot offset K ₂ A starting position (e.g., starting symbol index S) and an allocation length (e.g., number of symbols L) of PUSCH in a slot, and a PUSCH mapping type. K of PDSCH ₀ And PUSCH K ₂ The difference between the slot with PDCCH and the slot with PDSCH or PUSCH corresponding to PDCCH is indicated. The SLIV represents a joint indicator with respect to a start symbol S of the start of a slot having the PDSCH or PUSCH and the number L of consecutive symbols counted from the symbol S. The PDSCH/PUSCH mapping type has two mapping types: map type a and map type B. In PDSCH/PUSCH mapping type a, demodulation reference signals (DMRS) are mapped to PDSCH/PUSCH resources based on the beginning of a slot. One or two symbols among symbols of PDSCH/PUSCH resources may be used as DMRS symbols according to other DMRS parameters. For example, in PDSCH/PUSCH mapping type a, the DMRS is located on the third symbol (symbol # 2) or the fourth symbol (symbol # 3) in the slot according to RRC signaling. In PDSCH/PUSCH mapping type B, DMRS is mapped based on the first OFDM symbol of PDSCH/PUSCH resources. Depending on other DMRS parameters, one or two symbols from the first symbol of PDSCH/PUSCH resources may be used as DMRS symbols. For example, in PDSCH/PUSCH mapping type B, the DMRS is located on the first symbol allocated for PDSCH/PUSCH. In the present disclosure, PDSCH/PUSCH mapping type May be referred to as a mapping type or DMRS mapping type. For example, in the present disclosure, PUSCH mapping type a may be referred to as mapping type a or DMRS mapping type a, and PUSCH mapping type B may be referred to as mapping type B or DMRS mapping type B.

The scheduling DCI includes an FDRA field providing assignment information about RBs for a PDSCH or PUSCH. For example, the FDRA field provides information about a cell for PDSCH or PUSCH transmission to the UE, information about BWP for PDSCH or PUSCH transmission, and/or information about RBs for PDSCH or PUSCH transmission.

* Resource allocation by RRC

As described above, there are two types of transmissions without dynamic permissions: configuration license type 1 and configuration license type 2. In configuration grant type 1, UL grant is provided by RRC and stored as configuration UL grant. In configuration grant type 2, UL grants are provided by the PDCCH and stored or cleared as configuration UL grants based on L1 signaling indicating configuration UL grant enablement or disablement. Type 1 and type 2 may be configured by RRC per serving cell and per BWP. Multiple configurations may be active simultaneously on different serving cells.

When configuration grant type 1 is configured, the following parameters may be provided to the UE through RRC signaling:

-CS-RNTI corresponding to CS-RNTI for retransmission;

periodicity corresponding to the periodicity of configuration license type 1;

-timeDomainOffset indicating a resource offset in the time domain relative to a System Frame Number (SFN) =0;

-a timedomainalillocation value m providing a row index m+1 pointing to the allocation table, indicating a combination of start symbol S, length L and PUSCH mapping type;

-frequency domain allocation; and

-mcsAndTBS providing an IMCS indicating modulation order, target code rate and transport block size.

When configuration grant type 1 is configured for the serving cell through RRC, the UE stores the UL grant provided by RRC as the indicated configuration UL grant for the serving cell and initializes or reinitializes the configuration UL grant to start with a symbol according to timeDomainOffset and S (derived from SLIV) and repeat with periodicity. After configuring the UL grant for configuration grant type 1, the UE may consider the UL grant to repeat with each symbol association satisfying the following equation: [ (SFN numberOfSlotsPerFrame (numberOfSymbolsPerSlot) + (number of slots in frame x number of symbols per slot) +number of symbols in slots ] = (timeDomainOffset x number of symbols per slot+s+n x periodic) module (1024 x number of symbols per frame x number of symbols per slot), where number of symbols per frame and number of consecutive OFDM symbols per slot are indicated for all N > =0, respectively (see tables 1 and 2).

For configuration grant type 2, the bs may provide the following parameters to the UE through RRC signaling:

-CS-RNTI corresponding to CS-RNTI for enabling, disabling and retransmitting; and

periodicity providing periodicity of configuration license type 2.

The actual UL grant is provided to the UE through PDCCH (addressed to CS-RNTI). After configuring the UL grant for configuration grant type 2, the UE may consider the UL grant to repeat with each symbol association satisfying the following equation: [ (SFN x number ofslotsperframe x number ofsymbol perslot) + (number of slots in frame x number of symbols in slot) +]＝[(SFN _{Start time} *numberOfSlotsPerFrame*numberOfSymbolsPerSlot+slot _{Start time} *numberOfSymbolsPerSlot+symbol _{Start time} )+N*periodicity]Modulo (1024 x numberOfSlotsPerframe x numberOfSymbsPerslot) for all N>=0, wherein SFN _{Start time} 、slot _{Start time} And symbol _{Start time} SFN, slot and symbol, respectively, representing the first transmission opportunity of PUSCH after configuration grant can be (re) initialized, number ofslotsperframe and number ofsymbolsperslot indicate the number of consecutive slots per frame and the number of consecutive OFDM symbols per slot, respectively (refer to tables 1 and 2).

In some scenarios, the UE may be further provided by the BS with parameters HARQ-ProcID-Offset and/or parameters HARQ-ProcID-Offset2 for deriving the HARQ process ID configuring the UL grant. The HARQ-ProcID-Offset is an Offset of the HARQ process configuring the grant for the shared spectrum channel access operation, and the HARQ-ProcID-Offset2 is an Offset of the HARQ process configuring the grant. In the present disclosure, cg-retransmission timer is the duration after transmission (retransmission) based on configuration grant, where the UE should not autonomously perform retransmission based on HARQ process of transmission (retransmission). Cg-retransmission timer may be provided to the UE by the BS when configuring retransmissions for configuring UL grants. For configuration grants that do not configure neither HARQ-ProcID-Offset nor cg-retransmission timer, the HARQ process ID associated with the first symbol of the UL transmission may be derived from: HARQ process id= [ floor (current_symbol/periodicity) ] module nrofHARQ-Processes. For a configured UL grant with HARQ-ProcID-Offset2, the HARQ process ID associated with the first symbol of the UL transmission may be derived from: HARQ process id= [ current_symbol/periodicity) ] module nrofHARQ-process+harq-ProcID-Offset 2, wherein current_symbol= (SFN x number of slots in number of slots of number symbols per slot + frame, and number of slots per frame and number of consecutive OFDM symbols per slot, respectively. For a configuration UL grant with cg-retransmission timer, the UE may select a HARQ process ID from among HARQ process IDs available for configuration grant configuration.

On DL, semi-persistent scheduling (SPS) may be provided to the UE through RRC signaling from the BS per serving cell and per BWP. For DL SPS, DL assignments are provided to the UE over PDCCH and stored or cleared based on L1 signaling indicating SPS activation or deactivation. When configuring SPS, the BS may provide the UE with the following parameters through RRC signaling (e.g., SPS configuration) for configuring semi-persistent transmission:

-CS-RNTI corresponding to CS-RNTI for enabling, disabling and retransmitting;

-nrofHARQ-Processes, providing the number of HARQ Processes for SPS;

-periodicity providing periodicity of configuration DL assignments for SPS;

n1PUCCH-AN, HARQ resources of PUCCH for SPS are provided (the network configures HARQ resources to either format 0 or format 1, and the actual PUCCH resources are configured by PUCCH-config and referenced by its ID in n1 PUCCH-AN).

Multiple DL SPS configurations may be configured within the BWP of the serving cell. After configuring DL assignments for SPS, the UE may consider that the nth DL assignment occurs in sequence in a slot satisfying the following equation: (numberOfSlotsPerFrame SFN + number of slots in frame) = [ (numberOfSlotsPerFrame SFN) _{Start time} +slot _{Start time} )+N*periodicity*numberOfSlotsPerFrame/10]Modulo (1024 x numberOfSlotsPerframe), where SFN _{Start time} And slot _{Start time} The SFN and slot, respectively, representing the first transmission of PDSCH after configuration DL assignment is (re) initialized, the numberOfSlotsPerFrame and numberOfSymbolsPerSlot indicate the number of consecutive slots per frame and the number of consecutive OFDM symbols per slot, respectively (refer to tables 1 and 2).

In some scenarios, the UE may be further provided by the BS with a parameter HARQ-ProcID-Offset for deriving the HARQ process ID configuring the DL assignment. The HARQ-ProcID-Offset is the Offset of the HARQ process of the SPS. For a configuration DL assignment without HARQ-ProcID-Offset, the HARQ process ID associated with the slot from which the DL transmission starts may be determined from: HARQ process id= [ floor (current_slot 10/(numberofslot perframe)) ] module nrofHARQ-Processes, wherein current_slot= [ (SFN x number slot perframe) +slot number in the frame ], and numberofslot perframe represents the number of consecutive slots per frame. For a configuration DL assignment with HARQ-ProcID-Offset, the HARQ process ID associated with the slot from which the DL transmission starts can be determined from: HARQ process id= [ floor (current_slot/periodicity) ] module nrofHARQ-process+harq-ProcID-Offset, where current_slot= [ (SFN x number slot perframe) +number of slots in frame ], and number slot perframe represents the number of consecutive slots per frame.

If the CRC of the corresponding DCI format is scrambled with a CS-RNTI provided by an RRC parameter CS-RNTI and a new data indicator field of an enabled transport block is set to 0, the UE verifies the DL SPS assignment PDCCH or the configuration UL grant type 2PDCCH for scheduling enablement or scheduling release. If all fields of the DCI format are set according to tables 5 and 6, verification of the DCI format is achieved. Table 5 shows an example of a special field for DL SPS and UL grant type 2 scheduling enable PDCCH verification, and table 6 shows an example of a special field for DL SPS and UL grant type 2 scheduling release PDCCH verification.

TABLE 5

TABLE 6

	DCI Format 0_0	DCI Format 1_0
			HARQ process number	All set to "0"	All set to "0"
Redundancy version	Set to "00"	Set to "00"
			Modulation and coding scheme	All set to "1"	All set to "1"
Resource block assignment	All set to "1"	All set to "1"

The actual DL assignment and UL grant for DL SPS or UL grant type 2 and the corresponding MCS are provided by a resource assignment field (e.g., a TDRA field providing a TDRA value m, an FDRA field providing a frequency resource block assignment, and/or an MCS field) in the DCI format carried by the corresponding DL SPS or UL grant type 2 scheduling enable PDCCH. If authentication is achieved, the UE treats the information in the DCI format as a valid enablement or valid release of DL SPS or configuration UL grant type 2.

In the present disclosure, a DL SPS-based PDSCH may be referred to as an SPS PDSCH, and a UL Configuration Grant (CG) -based PUSCH may be referred to as a CG PUSCH. The PDSCH dynamically scheduled by DCI carried on PDCCH may be referred to as a Dynamic Grant (DG) PDSCH, and the PUSCH dynamically scheduled by DCI carried on PDCCH may be referred to as a DG PUSCH.

Fig. 7 illustrates an example of multiplexing UCI with PUSCH. The UCI may be transmitted through PUSCH when PUCCH resources overlap with PUSCH resources in a slot and simultaneous PUCCH-PUSCH transmission is not configured, as shown therein. The transmission of UCI on PUSCH is referred to as UCI piggybacking or PUSCH piggybacking. In particular, fig. 7 illustrates the case where HARQ-ACK and CSI are carried on PUSCH resources.

The time and frequency resources that the UE may use to report CSI are controlled by the BS. In 3GPP based systems, CSI may consist of the following indicators/reports: channel Quality Indicator (CQI), precoding Matrix Indicator (PMI), CSI-RS resource indicator (CRI), SS/PBCH block resource indicator (SSBRI), layer Indicator (LI), rank Indicator (RI), layer 1 reference signal received power (L1-RSRP), or layer 1 signal-to-interference-and-noise ratio (L1-SINR).

For CQI, PMI, CRI, SSBRI, LI, RI, L-RSRP, L1-SINR, the UE is configured by higher layer (e.g., RRC) signaling with N > =1 CSI-ReportConfig report settings, M > =1 CSI-ResourceConfig resource settings, and one or two trigger state lists (given by higher layer parameters CSI-apreriodic TriggerStateList and CSI-semipersistent on pusch-TriggerStateList). Each trigger state in the CSI-apeeriodicttriggerstatelist contains a list of associated CSI-ReportConfig indicating the resource set IDs for the channel and optionally for interference. Each trigger state in CSI-semipersistent on pusch-TriggerStateList contains an associated CSI-ReportConfig.

Each report setup CSI-ReportConfig is associated with a single downlink BWP (higher layer parameter BWP-Id indication provided by the BS) given in the associated CSI-ResourceConfig for channel measurements and contains parameters for one CSI reporting band: codebook configuration (including codebook subset restriction), time-domain behavior, frequency granularity for CQI and PMI, measurement restriction configuration, and the number of CSI correlations to be reported by the UE (e.g., LI, L1-RSRP, L1-SINR, CRI, and SSBRI).

There are three types of reports: periodic CSI (P-CSI) reporting, semi-persistent CSI (SP-CSI) reporting, and aperiodic CSI (a-CSI) reporting. The UE performs CSI reporting based on RRC configuration for CSI reporting by the BS. Reporting configurations for CSI may be aperiodic (using PUSCH), periodic (using PUCCH), or semi-persistent (using PUCCH and DCI-activated PUSCH). The above time domain behavior is indicated by the higher layer parameter reportConfigType in CSI-ReportConfig provided by the BS, which may be set as follows: "apidic", "semipersistent OnPUCCH", "semipersistent OnPUSCH" or "periodic".

The higher layer parameter reportquality in CSI-ReportConfig indicates the number of CSI correlations, L1-RSRP correlations, or L1-SINR correlations to report.

Each CSI resource setting CSI-ResourceConfig contains a configuration of a list of S > =1 CSI resource sets (given by the higher layer parameters CSI-RS-resourcesitsist), where the list consists of references to one or both of the NZP CSI-RS resource set and the SS/PBCH block set, or the list consists of references to the CSI-IM resource set. Each CSI resource setting is located in a DL BWP identified by a higher layer parameter BWP-id, and all CSI resource settings linked to a CSI report setting have the same DL BWP. The time domain behavior of CSI-RS resources within a CSI resource setting is indicated by a higher layer parameter resourceType and may be set to aperiodic, periodic, or semi-persistent. The following is one or more CSI resource settings configured for channel and interference measurements by higher layer signaling: CSI-IM resources for interference measurement, NZP CSI-RS resources for channel measurement.

In a wireless communication system, a BS configures RS resources (e.g., CSI-RS resources, SSB resources, etc.) for CSI reporting to a UE. The UE performs measurements on RSs received on the configured RS resources based on the configuration or trigger of the BS and periodically or aperiodically performs CSI reporting based on the measurements.

Aperiodic CSI reports carried on PUSCH support wideband and subband frequency granularity. Aperiodic CSI reports carried on PUSCH support type I, type II, and enhanced type IICSI. Type I CSI feedback is supported for CSI reporting on PUSCH. Type I wideband and subband CSI is supported for CSI reporting on PUSCH. Type IICSI is supported for CSI reporting on PUSCH. For type I, type II, and enhanced type IICSI feedback on PUSCH, CSI reporting may include two parts. Portion 1 has a fixed payload size and is used to identify the number of information bits in portion 2. Part 1 is sent in its entirety before part 2.

For type I CSI feedback, part 1 contains RI (if reported), CRI (if reported), CQI (if reported) of the first codeword. Part 2 contains the PMI (if reported) and contains the CQI of the second codeword (if reported) when RI (if reported) is greater than 4.

>For type IICSI feedback, part 1 contains an indication of RI (if reported), CQI, and the number of non-zero wideband amplitude coefficients per layer for type IICSI. The field of part 1, RI (if reported), CQI, and an indication of the number of non-zero wideband amplitude coefficients per layer, is encoded separately. Part 2 contains PMI of type I CSI. i.e _1,4,l 、i _2,1,l (if reported) and i _2,2,l The elements of (report) are reported in ascending order of their index, i=0, 1,..2L-1, where the element of the lowest index maps to the most significant bit and the element of the highest index maps to the least significant bit. Part 1 and part 2 are encoded separately.

For enhanced type IICSI feedback, part 1 contains an indication of the total number of cross-layer non-zero amplitude coefficients for RI, CQI, and enhanced type IICSI. The fields of part 1, RI, CQI and an indication of the total number of cross-layer non-zero amplitude coefficients, are encoded separately. Part 2 contains PMI of enhanced type IICSI. Part 1 and part 2 are encoded separately.

The UE may be semi-statically configured by higher layers to perform periodic CSI reporting on the PUCCH. The UE may be configured by a higher layer for a plurality of periodic CSI reports corresponding to a plurality of higher layer configured CSI report settings, wherein the associated CSI resource settings are configured by the higher layer. Periodic CSI reports on PUCCH formats 2, 3, 4 support type I CSI with wideband granularity. The semi-persistent CSI report on PUCCH supports type I CSI. The semi-persistent CSI report on PUCCH format 2 supports type I CSI with wideband frequency granularity. The semi-persistent CSI report on PUCCH format 3 or 4 supports type I CSI and type IICSI part 1 with wideband and subband frequency granularity. When PUCCH carries type I CSI with wideband frequency granularity, the CSI payloads carried by PUCCH format 2 and PUCCH format 3 or 4 are the same and are the same regardless of RI (if reported), CRI (if reported). For type I CSI subband reporting on PUCCH formats 3 or 4, the payload is split into two parts. The first part contains RI (if reported), CRI (if reported), CQI for the first codeword. The second part contains PMI and CQI for the second codeword when RI > 4.

The UE calculates CSI parameters to be reported based on the configuration or trigger of the BS by assuming the following dependency between CSI parameters:

-calculating LI on condition of the reported CQI, PMI, RI and CRI;

-calculating CQI on the condition of reported PMI, RI and CRI;

-calculating PMI on condition of reported RI and CRI;

-calculating RI on condition of reported CRI.

In order to perform CSI reporting configured or instructed to the UE, the UE needs to receive an RS for CSI reporting and perform CSI calculation based on the RS. Thus, if the UE determines all CSI values to be included in CSI reports associated with PUSCH or PUCCH transmission according to its CSI report configuration and then performs CSI reporting through PUSCH or PUCCH transmission, a time delay including CSI calculation time occurs there. However, a long time delay in CSI reporting means that a lot of time is required to ensure accuracy of CSI and MCS. This is not only unsuitable for traffic that is delay sensitive, difficult to predict traffic characteristics and sporadic, such as URLLC, but also unsuitable for bursty transmissions that are performed in a short time. The reason for this is that the accuracy of CSI and MCS is very important for enhancing URLLC reliability. Therefore, there is a need for a method capable of not only reducing a delay time experienced by a UE by reducing a processing time of the UE but also performing CSI reporting with high accuracy.

In some implementations, it may be considered to reduce the amount of information that needs to be processed by sending only a portion of the CSI that the UE conventionally reports (e.g., NR Rel-16). In some implementations, the UE may perform the partial CSI reporting under predetermined conditions, i.e., the UE may transmit only partial CSI to the BS under predetermined conditions. However, if the BS has difficulty in knowing whether a predetermined condition is satisfied at the UE, the BS may not predict the total bit size of UCI to be transmitted by the UE, and thus, the BS may encounter difficulty in decoding UCI received from the UE.

Hereinafter, the present disclosure not only solves the problem that may occur when a UE transmits only a portion of CSI (e.g., CQI) to reduce CSI processing time required by the UE, but also provides a solution thereof. For example, the present disclosure describes some implementations of the condition that the UE is able to send only partial CSI and the additional information that the UE needs to provide for successful reception of CSI by the BS.

In the present disclosure, partial CSI report may refer to an operation of transmitting or updating only at least some of two or more CSI transmitted by a UE according to a conventional CSI report. For example, the partial CSI report may mean that the UE does not transmit wideband/subband CQI, RI, and PMI in CSI, but only wideband/subband CQI. Alternatively, the partial CSI report may mean that the UE performs CSI reporting by updating only CQI but using the same value as that previously transmitted for the remaining information. In some implementations, since the UE does not perform the processing necessary to generate the information, the information omitted due to the partial CSI report may not be derived or the information omitted due to the partial CSI report may be discarded from transmission after performing the processing necessary to derive the omitted information. In some implementations of the present disclosure, if the information omitted due to the partial CSI report is not derived by the UE but needs to derive/generate other information that needs to be transmitted, the UE may perform the derivation/generation of the other information that is required based on the previously derived or transmitted information or the most recently derived or transmitted information. In some implementations of the disclosure, the particular information on which the partial CSI report is based (e.g., information used to derive values to be transmitted in the partial CSI report) may be limited to information associated with the same CSI configuration as that of the partial CSI report. In other words, the UE may derive/generate information required for the partial CSI report based on previously derived or transmitted information or recently derived or transmitted information under the same CSI configuration as that for the partial CSI report.

In some scenarios (e.g., NR Rel-16), when a UE loads UCI payload on UL resources determined (for UL multiplexing) from among given PUCCH resources, the UE may not load the entire generated CSI on UL resources due to the limitation of the amount of information that the determined UL resources can accommodate. In this case, the UE performs CSI omission to omit some generated CSI based on CSI part 1, based on CSI part 2, or based on subbands for CSI part 2, if necessary.

While CSI omission aims at including as much information as possible in limited UL resources, partial CSI reporting according to some implementations of the present disclosure aims at reducing processing time by reducing the information that the UE needs to generate. Thus, unlike CSI omission in which some of the generated CSI is excluded from the UCI payload based on CSI part 1, CSI part 2, or CSI part 2 based on subbands, partial CSI omission according to some implementations of the present disclosure includes only the part that generates CQI/RI/PMI to be included in the CSI report. In the case of CSI omission, if the condition according to some implementations of the present disclosure is satisfied, a CSI configuration may be provided to the UE to enable the UE to generate only some values to be included in the CSI report. In addition, even at the time of CSI reporting, the UE needs to be able to determine whether to semi-statically exclude partial CSI before UCI multiplexing. Considering that the purpose of partial CSI reporting is to reduce the amount of information and thus reduce the processing time required for CSI generation, it is necessary to determine whether to perform partial CSI reporting before CSI generation. CSI reporting may be an example of complete CSI reporting, as for CSI reporting, the UE generates CSI values that the UE is configured/instructed to report.

UE side:

fig. 8 illustrates an operational flow of a UE in accordance with some implementations of the present disclosure.

The UE may be configured with higher layer parameters required for CSI transmission. The UE may perform partial CSI reporting only when conditions according to some implementations of the present disclosure are satisfied. In some implementations of the present disclosure, the following UE operations may be considered.

The UE may receive one or more RRC configurations for CSI transmission from the BS (S801). The RRC configuration may be received separately for each CSI configuration.

The UE may receive DCI transmitted by the BS (S803). The UE may transmit CSI on PUCCH/PUSCH resources indicated by the DCI or PUSCH/PUCCH resources determined based on configured PUCCH resources (through higher layer signaling from the BS). In this case, some implementations of the present disclosure may be used to select a corresponding PUCCH resource.

To transmit CSI, the UE may also perform partial CSI reporting according to some implementations of the present disclosure (S805). In other words, the UE may optionally update CQI, RI, and PMI information. For example, to determine whether to perform partial CSI reporting, the UE may consider a time domain position of a last measurement resource to be used for CSI reporting.

The last measurement resource refers to a resource used by the UE for CSI reporting, which may be represented by CSI reference resources. In some implementations of the present disclosure, the measurement resources may be CSI-RS resources. For example, the measurement resources may be non-zero power (NZP) CSI-RS resources and/or CSI interference measurement (CSI-IM) resources, where the UE performs channel measurements and/or interference measurements to calculate CQI values. Alternatively, in some implementations of the present disclosure, the measurement resources may be CSI reference resources defined in section 5.2.2.5 of 3gpp TS 38.214. For example, according to 3GPP TS 38.214 Rel-16, the CSI reference resources for the serving cell are defined as follows:

In the frequency domain, CSI reference resources are defined by a set of downlink physical resource blocks corresponding to the band associated with the derived CSI.

>In the time domain, a single downlink time slot n-n _{CSI_ref} CSI reference resources for CSI reporting in uplink slot n' are defined,

>>where n=floor { n' (2^u _DL /2^u _UL )}+floor{(n ^CA _{slot,offset,UL} /2^u _offset,UL )-(n ^CA _{slot,offset,DL} /2^u _offset,DL ) And u _DL And u _UL Subcarrier spacing configuration for DL and UL, respectively, and n is determined by ca-SlotOffset configured by higher layers for cells transmitting uplink and downlink ^CA _slot,offset And u _offset ，

Wherein for periodic and semi-persistent CSI reporting

>>>If a single CSI-RS/SSB resource is configured for channel measurement, n _{CSI_ref} Is greater than or equal to 4 x 2 u _DL Such that it corresponds to a valid downlink time slot, or

>>>If multiple CSI-RS/SSB resources are configured for channel measurement, n _{CSI_ref} Is greater than or equal to 5 x 2 u _DL Such that it corresponds to a valid downlink time slot.

>>Wherein, for aperiodic CSI reporting, if the UE is indicated by the DCI to report CSI in the same slot as the CSI request, n _{CSI_ref} So that the reference resource is in the same valid downlink time slot as the corresponding CSI request, otherwise n _{CSI_ref} Is greater than or equal to floor (Z'/N) ^slot _symb ) Such that time slots n-n _{CSI_ref} Corresponds to a valid downlink time slot, where Z' corresponds to a delay requirement (see table 7 or table 8).

When periodic or semi-persistent CSI-RS/CSI-IM or SSB is used for channel/interference measurement, it is not desirable for the UE to measure channel/interference on CSI-RS/CSI-IM/SSB, the last OFDM symbol of CSI-RS/CSI-IM/SSB is received until Z' symbols before the transmission time of the first OFDM symbol of the aperiodic CSI report.

Table 7 shows CSI calculation delay requirement 1, and table 8 shows CSI calculation delay requirement 2. For example, according to 3GPP TS 38.214Rel-16, Z' and u are defined as z=max _{m＝0,...,M-1} (Z (m)) and Z' =max _{m＝0,...,M-1} (Z '(M)), where M is the number of updated CSI reports, (Z (M), Z' (M)) corresponds to the mth updated CSI report and is defined as (Z) of table 7 according to a predefined condition ₁ ，Z ₁ '), table 8 (Z) ₁ ，Z ₁ '), table 8 (Z) ₃ ，Z ₃ ') or (Z) of Table 8 ₂ ，Z2')。

TABLE 7

TABLE 8

U of tables 7 and 8 corresponds to min (u _PDCCH ,u _CSI-RS ,u _UL ) Wherein u is _PDCCH A subcarrier spacing corresponding to a PDCCH using which DCI is transmitted, and u _UL A subcarrier spacing corresponding to a PUSCH using which CSI reports are transmitted, and u _CSI-RS Corresponds to a minimum subcarrier spacing of the aperiodic CSI-RS triggered by the DCI. In Table 8, X _u Is based on UE reporting capability beamReportTiming, KB ₁ Is based on the capability of the UE reporting, beamSwitchTiming (see 3gpp TS 38.306).

A slot in the serving cell may be considered a valid downlink slot if it includes at least one higher layer configured downlink or flexible symbol and it does not fall within a measurement gap configured for the UE. If there is no valid downlink slot in the serving cell for CSI reference resources corresponding to CSI reporting settings, CSI reporting is omitted for the serving cell in uplink slot n'.

After CSI reporting (reconfiguration), serving cell activation, BWP change or SP-CSI activation, the UE reports CSI reports only after receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and/or CSI-IM occasions for interference measurement no later than the CSI reference resources, otherwise the reports are discarded.

For example, the UE derives the highest CQI index for each CQI value reported in uplink slot n that satisfies the following condition: a single PDSCH transport block having a combination of modulation scheme corresponding to CQI index, target code rate, and transport block size and occupying a set of downlink physical resource blocks called CSI reference resources can be received in a manner not exceeding the transport block error probability. According to higher layer parameter values provided by the BS: the UE derives channel measurements for calculating CSI values reported in uplink slot n based only on NZP CSI-RS associated with CSI resource settings that are no later than CSI reference resources; the UE derives channel measurements for calculating CSI reported in uplink slot n based only on the latest, no later than the occasions of the NZP CSI-RS associated with CSI resource settings for the CSI reference resources; the UE derives interference measurements for calculating CSI values reported in uplink time slot n based only on CSI-IM and/or NZP CSI-RS associated with CSI resource settings that are no later than interference measurements of CSI reference resources; alternatively, the UE derives an interference measurement for calculating CSI values reported in uplink time slot n based on the timing of the CSI-IM and/or NZP CSI-RS for the most recent, no later than CSI reference resource, interference measurement related to CSI resource setting (defined in [4, ts 38.211 ]).

In some implementations, if configured to report CQI indices, in CSI reference resources, the UE assumes some conditions for deriving CQI indices, and if also configured to report PMI and RI, the UE assumes some conditions for deriving PMI and RI. For example, the UE assumes the following: the first 2 OFDM symbols are occupied by control signaling; the number of PDSCH and DM-RS symbols is equal to 12; the same bandwidth part subcarrier spacing for PDSCH reception configuration; bandwidth configured for the corresponding CQI report; the reference resource uses a CP length and a subcarrier spacing configured for PDSCH reception; the primary or secondary synchronization signal or PBCH does not use resource elements; redundancy version 0, etc.

In some scenarios, CSI reporting is triggered by RRC and/or DCI and is related to CSI reporting configuration. The CSI report configuration indicates PUCCH resources and CSI-RS resource configurations to be used for CSI reporting, and the UE determines CSI reference resources to be used for triggered CSI reporting. The above procedure may be considered as a basic procedure to find the closest CSI-RS/CSI-IM/SSB that satisfies the processing time (denoted as Z or Z') required for CSI reporting. In some implementations of the disclosure, shorter CSI processing times may be assumed when the UE considers CSI reference resources to determine whether to perform partial CSI reporting. For example, the CSI processing time required for partial CSI reporting, denoted as Z, may be considered _pCSI . In this case, Z is smaller than Z or Z _pCSI May be predefined, determined by capability signaling of the UE, or determined by higher layer signaling or L1 signaling from the BS. In some implementations of the disclosure, if the CSI reference resource satisfies Z _pCSI (wherein Z _pCSI <Z and Z _pCSI <Z'), the UE performs partial CSI reporting based on the CSI reference resource. If the CSI reference resource satisfies not only Z but also Z or Z', the UE may perform conventional full CSI reporting based on the CSI reference resource.

For Z _pCSI The CSI reference resource may be selected in consideration of the following method.

For periodic and semi-persistent CSI reporting

>>In some implementations of the present disclosure, the number of slots (denoted as n) used in determining CSI reference resources defined in section 5.2.2.5 of 3gpp TS 38.214 is considered _{CSI_ref} )，n _{CSI_ref} Is greater than or equal to X2^u _DL Such that the resource corresponds to a valid DL symbol. In some implementations, X may be an integer less than 5, such as 1, 2, or 3. In some implementations, X may be greater than floor (Z _pCSI /N ^slot _symb )。

>>Alternatively, in some implementations of the present disclosure, the representation n used in determining CSI reference resources defined in section 5.2.2.5 of 3gpp TS 38.214 is considered _{CSI_ref} N, the number of time slots of (a) n _{CSI_ref} Is greater than or equal to floor (Z _pCSI /N ^slot _symb ) Such that the resource corresponds to a valid DL symbol.

Aperiodic CSI reporting for CSI request in time slot n

>>In some implementations of the present disclosure, consider the representation n used in determining CSI reference resources defined in section 5.2.2.5 of 3gpp TS 38.214 _{CSI_ref} If the UE is instructed to report CSI in the same slot as the slot in which the CSI request is received by DCI, n _{CSI_ref} To ensure that the reference resource is located in the same valid DL slot as the corresponding CSI request. Otherwise, n _{CSI_ref} Is greater than or equal to floor (Z _pCSI /N ^slot _symb ) Such that the time slot (n-n _{CSI_ref} ) Is a valid DL slot. In this case, DL slot n is defined by UL slot n', as described in section 5.2.2.5 of 3gpp TS 38.214.

>If periodic or semi-persistent CSI-RS/CSI-IM or SSB is used for channel/interference measurement, then the undesirable UE measures channel/interference on the CSI-RS/CSI-IM/SSB, where the last OFDM symbol is received until Z before the transmission time of the first OFDM symbol of the aperiodic CSI report _pCSI The symbols.

According to some implementations of the present disclosure, when a UE transmits CSI, the UE may optionally include the CQI, RI, and PMI in the CSI report as part of the total CSI the UE is configured and/or instructed to report.

The following UE operations may be further considered in some implementations of the present disclosure.

< implementation A1> conditional partial CSI reporting

When the UE is capable of performing partial CSI reporting and the UE is configured with CSI configuration allowing partial CSI reporting, the UE may perform partial CSI reporting only under predetermined conditions. For example, at least one of the following conditions may be considered:

l1 signaling (e.g., DCI) triggering the corresponding CSI configuration includes an indicator indicating a partial CSI report.

The RI and/or PMI values in the previously reported CSI values remain within a certain threshold range T K times in succession (in other words, the difference between any two values selected from the K values reported previously is within T). In this case, each of K and T may have a predefined value or a value configured or indicated by higher layer parameters or L1 signaling from the BS. The previously reported CSI value may be a value associated with a particular CSI configuration. For example, the specific CSI configuration may be a CSI configuration for partial CSI reporting or a CSI configuration related thereto.

Figure 9 illustrates an example of partial CSI reporting according to some implementations of the present disclosure. The partial CSI reporting may be performed based on a time interval between PUSCH/PUCCH resources on which CSI is to be reported and measurement resources to be used for CSI reporting. For example, referring to fig. 9, partial CSI reporting may be performed when a time interval from the end of the last symbol of a measurement resource to be used to the start of the first symbol of a PUSCH/PUCCH resource on which CSI is to be reported is less than a prescribed time interval T1 and greater than or equal to a prescribed time interval T2, where T1> T2.

>>Time interval T1 may represent a conventionally required CSI processing time. For example, the time interval T1 may be a predefined processing time to ensure the time required to calculate the full set of CSI values configured to be included in the triggered CSI report. For example, the time interval T1 may refer to the symbol length Z or Z' or CSI calculation time T obtained from the symbol length Z or Z _proc,CSI Or T' _proc,CSI As defined in section 5.4 of 3gpp TS 38.214. For example, referring to section 5.4 of 3GPP TS 38.214Rel-16, when a CSI request field on DCI triggers a CSI report on PUSCH, the UE should provide a valid CSI report for the n-th triggered report if: if the first uplink symbol carrying the corresponding CSI report including the effect of timing advance is not earlier than symbol Z _ref Initially, and if the bearer includes a timing handleThe first uplink symbol of the nth CSI report of the previous impact is not earlier than the symbol DCI Z' _ref (n) starting, wherein Z _ref Defined as the next uplink symbol, its CP starts at T after the end of the last symbol of PDCCH triggering CSI reporting _proc,CSI ＝(Z)*(2048+144)*κ*2 ^-u *T _c +T _switch And wherein Z' _ref (n) is defined as the next uplink symbol whose CP starts at T 'after the end of the last symbol of the following latest time' _proc,CSI ＝(Z')*(2048+144)*κ*2 ^-u *T _c : when aperiodic CSI-RS is used for channel measurement of the nth triggered CSI report, aperiodic CSI-RS resources for channel measurement, aperiodic CSI-IM for interference measurement, and aperiodic NZP CSI-RS for interference measurement, and wherein only Z in table 7 is applied ₁ Only when T is applied _switch . As described above, Z, Z' and u can be defined as follows: z=max _{m＝0,...,M-1} (Z (m)) and Z' =max _{m＝0,...,M-1} (Z' (m)). Here, M represents the number of updated CSI reports, (Z (M), Z' (M)) corresponds to the mth updated CSI report and is defined as (Z) in table 7 according to a predetermined condition ₁ ，Z ₁ '), table 8 (Z) ₁ ，Z ₁ '), table 8 (Z) ₃ ，Z ₃ ') or (Z) in Table 8 ₂ ，Z ₂ ')。

The > time interval T2 may represent the CSI processing time required for partial CSI reporting in terms of measurement resources. T2 may be a predefined value, a value determined by capability signaling of the UE, or a value determined by higher layer signaling or L1 signaling from the BS.

Figure 10 illustrates another example of partial CSI reporting according to some implementations of the present disclosure. The UE may perform partial CSI reporting based on a time interval between PUSCH/PUCCH resources on which CSI is to be reported and reception of DCI triggering CSI reporting. For example, referring to fig. 10, partial CSI reporting may be performed when a time interval from a last symbol of a PDCCH on which DCI triggering CSI reporting is received to a first symbol of a PUSCH/PUCCH resource on which CSI is to be reported ends is less than a prescribed time interval T2 and greater than or equal to a prescribed time interval T4, where T3> T4.

>>Time interval T3 may represent a conventionally required CSI processing time. For example, time interval T3 may be a predefined processing time to ensure the time required to calculate the full set of CSI values configured to be included in the triggered CSI report. For example, time interval T3 may refer to CSI calculation time defined in section 5.4 of 3gpp TS 38.214 (e.g., T _proc,CSI Or T' _proc,CSI )。

The > time interval T4 may represent CSI processing time required for partial CSI reporting with respect to DCI reception. T4 may be a predefined value, a value determined by capability signaling of the UE, or a value determined by higher layer signaling or L1 signaling from the BS.

In the case where the condition is not satisfied: for example, referring to fig. 9, when a time interval from the end of the last symbol of a measurement resource to be used to the start of the first symbol of a PUSCH/PUCCH resource on which CSI is to be reported is greater than or equal to a prescribed time interval T1; or, for example, referring to fig. 10, when a time interval from the end of the last symbol of the PDCCH on which DCI triggering CSI reporting is received to the start of the first symbol of PUSCH/PUCCH resources on which CSI is to be reported is greater than or equal to a prescribed time interval T3, the UE may perform conventional CSI reporting including all information based on CSI configuration allowing partial CSI reporting.

In other cases where the condition is not satisfied: for example, referring to fig. 9, when a time interval from the end of the last symbol of a measurement resource to be used to the start of the first symbol of a PUSCH/PUCCH resource on which CSI is to be reported is less than a prescribed time interval T2, the UE may perform conventional CSI reporting including all information based on CSI configuration allowing partial CSI reporting. To this end, the UE may determine a measurement resource whose time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is greater than a prescribed time interval T1 as a new measurement resource for the corresponding CSI report.

< implementation A1-1> CSI indicator for partial CSI reporting

When the UE transmits the partial CSI by performing the partial CSI report according to a predetermined condition as described in embodiment A1/B1, the UE may arbitrarily perform the partial CSI report or the full CSI report according to circumstances. That is, when the UE performs partial CSI reporting according to a predetermined condition and when it is determined whether the condition is satisfied based on information derived by the UE, the BS may not predict whether the UE will perform partial CSI reporting or complete CSI reporting. In addition, when the BS does not know the total bit size of UL transmissions performed by the UE, the BS may have difficulty in performing decoding on the corresponding UL transmissions. Thus, the UE may need to indicate to the BS whether the UL transmission is a partial CSI report or a full CSI report. To indicate whether to perform partial CSI reporting, at least one of the following methods may be used.

* The UE may perform encoding of bit information of a predefined length representing a total bit length of the CSI report separately from the CSI report, and then append the bit information of the predefined length to the CSI report.

* The UE may perform encoding on 1-bit information indicating whether to perform partial CSI reporting separately and then append the 1-bit information to the CSI report.

* The UE may use different CRC masks for the partial CSI report and the full CSI report. In this case, the value configured to the UE by each CSI configuration may be used as information for the CRC mask.

* The UE may use different scrambling sequences for the partial CSI report and the full CSI report. In this case, the value configured to the UE by each CSI configuration may be used as information for deriving the scrambling sequence.

* The UE may use different PUCCH resources for the partial CSI report and the full CSI report. For this, PUCCH resources to be used for partial CSI reporting may be additionally configured in CSI configuration provided to the UE.

* The UE may perform reporting by including partial CSI reports in part 2 of the related art type I and type II CSI. According to 3gpp TS 38.214, for CSI feedback on PUSCH, e.g. type I CSI, type IICSI and enhanced type IICSI, the CSI report consists of two parts. Portion 1 has a fixed payload size and is used to identify the number of information bits in portion 2. The entire content of part 1 is sent before part 2. In other words, the UE may include the partial CSI report in part 2 and indicate whether the partial CSI is contained through part 1. Thus, the BS can estimate the bit length of the part 2 by receiving and decoding the part 1 of a fixed bit length, and successfully receive the partial CSI report. For the above operation, information indicating whether to perform partial CSI reporting may be included in part 1 of CSI.

* The UE may perform CSI reporting by adding partial CSI reporting to conventional type I and type IICSI as an additional part 3. According to 3gpp TS 38.214, for CSI feedback on PUSCH, e.g. type I CSI, type IICSI and enhanced type IICSI, the CSI report consists of two parts. Portion 1 has a fixed payload size and is used to identify the number of information bits in portion 2. The entire content of part 1 is sent before part 2. If the UE includes a partial CSI report in the new part 3 and indicates whether the partial CSI is included through part 1, the UE may inform whether the partial CSI report is included, not only without any change to the existing partial 2CSI, but also without ambiguity in bit size. Thus, the BS can estimate the bit length of the part 2 by receiving and decoding the part 1 of a fixed bit length, and successfully receive the partial CSI report. For the above operation, information indicating whether to perform partial CSI reporting may be included in part 1 of CSI. The corresponding information may be encoded separately from other values in CSI part 1. In addition, the CSI part 3 newly added in the above operation may be encoded separately from other CSI parts.

* The UE may include a portion of the partial CSI in part 1 of the conventional types I and IICSI and include the remaining portion of the partial CSI in the second portion thereof. In this case, the partial CSI included in the part 1 may be always transmitted whenever the corresponding CSI report is transmitted, regardless of whether a predetermined condition is satisfied. Alternatively, the partial CSI included in the part 1 may always be zero-padded as much as the size of the bit to be transmitted, and then transmitted. The partial CSI included in the part 2 may be transmitted according to whether a predetermined condition is satisfied. In this case, the CSI included in the part 1 may consist of information on a specific subband (such as a subband having an even or odd index). Therefore, even if the BS fails to receive the partial 2CSI due to ambiguity, the BS can receive the CSI on all radio resources through the part 1.

< implementation A2> hierarchical CSI configuration for partial CSI reporting

The UE may receive two or more CSI configurations from the BS to perform the partial CSI reporting. In this case, among CSI configurations, one or more CSI configurations X may be used for partial CSI reporting, and one or more other CSI configurations Y may be used for general CSI reporting. Each CSI configuration configured for the partial CSI report may be associated with one or more CSI configurations Y. For example, CSI configuration X may be configured to have one or more CSI configurations Y as a reference CSI configuration. Alternatively, for one CSI configuration Y, a parent-child relationship may be established, with Y as the parent and X as the child.

When at least one of the conditions shown in implementation A1/B1 is satisfied for CSI configuration Y, the UE may consider that partial CSI reporting is triggered for CSI configuration X associated with CSI configuration Y. Thus, the UE may perform partial CSI reporting. For example, the partial CSI report may be triggered based on another CSI configuration associated with the partial CSI configuration X. Thus, partial CSI reporting may be performed. Such triggering may be performed based on CSI reported through other CSI configurations.

< implementation A3> PUCCH resource selection for partial CSI reporting

In some scenario-based systems (e.g., NR Rel-16 based systems), a UE may determine a PUCCH to transmit based on the size of all UCI bits to be included in the PUCCH for PUCCH transmission and a PUCCH resource set indicating or configured for the corresponding PUCCH transmission. If multiple PUCCH transmissions overlap in time, the PUCCH to be used may be determined based on the size of all UCI bits to be transmitted in the overlapping PUCCH and the type of UCI (e.g., SR, HARQ-ACK, CSI, etc.).

The BS needs to know the exact size of all UCI bits sent by the UE to predict PUCCH transmission from the UE. However, when some implementations of the present disclosure are applied or when the UE autonomously performs partial CSI reporting, the total UCI bit size may vary depending on whether partial CSI reporting is performed or not. This may lead to ambiguity between UE and BS. To solve this problem, at least one of the following methods may be used to ensure that the UE and the BS determine the same PUCCH resource.

When selecting PUCCH resources, the UE and the BS may employ a specific value of UCI size of the partial CSI report. The specific value may be determined whether or not the partial CSI report is actually performed.

The specific value may be a predefined value, a value configured by higher layer signaling from the BS, or a value indicated by L1 signaling. For example, the specific value may be a value determined based on a parameter in a CSI configuration associated with the partial CSI report, or corresponds to a maximum length of CSI bits that can be transmitted based on the corresponding CSI configuration.

If the specific value is less than the actual bit length of CSI required for transmission, the UE may omit part of CSI so that the CSI bit length becomes less than or equal to the specific value. To achieve this, a specific value may be set as an upper limit of the CSI bit length that can be included in the UCI multiplexing process. Such a procedure may be performed for each component of the CSI, and in this case, the specific value may be an upper limit of a bit size of a portion including the partial CSI report.

If the partial CSI report is transmitted only when a predetermined condition is satisfied, the UE and the BS may assume that the partial CSI report is always transmitted on the configured resources and then select PUCCH resources for CSI reporting.

< implementation A4> extended CQI bit range

When the UE reports CQI information as part of CSI, a larger bit size may be allocated for CQI reporting to enhance the accuracy of the CQI information. In particular, when the UE reports the CQI value of each sub-band, it may be considered to use a 3-bit differential CQI table or a 4-bit CQI table instead of using a 2-bit differential CQI table. For partial CQI reporting, this operation may be beneficial because CQI information is extended and transmitted instead of RI/PMI. Further, this operation can improve accuracy of CQI information even when partial CQI reporting is not performed. For example, a 3-bit differential CQI table shown in table 9 may be employed. Alternatively, one of the 4-bit CQI tables shown in tables 10 to 13 may be used.

TABLE 9

Sub-band differential CQI value	Offset level
		0	0
1	1
		2	2
3	3
		4	≥4
5	-1
		6	-2
7	≤-3

Table 10

TABLE 11

Table 12

TABLE 13

Higher layer parameters cqi-Table in CSI-ReportConfig provided by BS configure Table1 corresponding to Table 10, table2 corresponding to Table 11, table3 corresponding to Table 12, or Table4 corresponding to Table 13.

However, if a 3-bit differential CQI table or a 4-bit CQI table is always used for all subbands, CSI overhead may increase. To solve this problem, at least one of the following methods can be considered.

* Method 1: the Most Significant Bit (MSB) of the bit sequence including the part 1CSI or the sub-band CQI therein may contain a bit length for all or part of the sub-band CQI. The UE may extend the per-subband CQI to a bit length to be used for CQI and report the subband CQI as part 2CSI. The UE is allowed to transmit the extended CQI information only when the UE needs to transmit the extended CQI information. For example, the UE may report CSI by: including one bit indicating a bit length to be used for the sub-band CQI in the part 1CSI (e.g., "0" =legacy and "1" =extended to three bits), and including the sub-band CQI to which the extended CQI bit range is applied in the part 2CSI. Upon receiving the CSI, the BS may interpret the subband CQI to be reported in the partial 2CSI.

Additionally, in some implementations of the disclosure, subband CSI reporting with an applied extended CQI bit range as compared to other CSI reportsThe notification may be assigned a higher priority. For example, when the priority of CSI reports is determined as follows, the value of y or k may be determined according to whether the extended CQI bit range is applied: CSI reporting and Pri _iCSI (y,k,c,s)＝2*N _cells *M _s *y+N _cells *M _s *k+M _s * The priority value of c+s is associated, wherein:

for aperiodic CSI reports to be carried on PUSCH, y=0, for semi-persistent CSI reports to be carried on PUSCH, y=1, for semi-persistent CSI reports to be carried on PUCCH, y=2, for periodic CSI reports to be carried on PUCCH, y=3;

for CSI reports carrying L1-RSRP or L1-SINR, k=0, and for CSI reports not carrying L1-RSRP or L1-SINR, k=1;

>c is the serving cell index, and N _cells Is the value of the higher layer parameter maxNrofServingCells provided by the BS; and

>s is reportConfigID, M _s Is the value of the higher layer parameter maxNrofCSI-ReportConfigurations provided by the BS.

Pri for the first CSI report if compared to the second CSI report _iCSI The association value of (y, k, c, s) is lower, the first CSI report may be said to have priority over the second CSI report.

As an example, when an extended CQI bit range is applied, k may be determined as follows: k=0 or k= -1.

As another example, when the extended CQI bit range is applied, a value obtained by subtracting 0.5 or 1 from the determined value of k may be used. If the value of k is less than 0 due to the above operation, k=0 may be used.

As another example, when the extended CQI bit range is applied, a value obtained by subtracting 0.5 or 1 from the determined y value may be used. If the value of y is less than 0 due to the above operation, y=0 may be used.

BS side:

the above-described implementation of the present disclosure will be explained again from the perspective of the BS. Fig. 11 illustrates an operational flow of a BS according to some implementations of the present disclosure.

The BS may configure higher layer parameters required for CSI transmission to the UE. Only when the condition according to some implementations of the present disclosure is satisfied, the BS may expect a partial CSI report by the UE and receive the CSI report from the UE and perform decoding thereon. Alternatively, the BS may identify whether the UE performs the partial CSI report or the full CSI report by performing blind decoding of the partial CSI report or based on an indicator included in the CSI transmission. The BS may then receive the CSI report from the UE and perform decoding thereon. In some implementations of the present disclosure, the following BS operations may be considered.

The BS may transmit one or more RRC configurations for CSI reception to the UE (S1101). The RRC configuration may be sent separately for each CSI configuration.

The BS may trigger CSI reporting to the UE (S1103). The BS may receive the triggered CSI report on the PUCCH resource or PUSCH resource.

According to some implementations of the present disclosure, when CSI is received, the BS may assume that the UE will optionally update CQI, RI, and PMI information. In other words, according to some implementations of the present disclosure, the BS may receive a partial CSI report reporting based on the partial CSI from the UE (S1105). For example, to determine whether the UE performs partial CSI reporting, the BS may assume that the UE will consider the time domain location of the last measurement resource to be used for CSI reporting.

The following BS operations may be further considered in some implementations of the present disclosure.

< implementation B1> conditional partial CSI reporting

When the UE is capable of performing partial CSI reporting and the UE is configured with CSI configuration allowing partial CSI reporting, the BS may assume that the UE will perform partial CSI reporting only under predetermined conditions. For example, at least one of the following conditions may be considered:

l1 signaling (e.g., DCI) triggering a corresponding CSI configuration includes an indicator indicating a partial CSI report.

The partial CSI reporting may be performed based on a time interval between PUSCH/PUCCH resources on which CSI is to be reported and measurement resources to be used for CSI reporting. For example, referring to fig. 9, when a time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is less than a prescribed time interval T1 and greater than or equal to a prescribed time interval T2, partial CSI reporting may be performed, where T1> T2.

>>Time interval T1 may represent a conventionally required CSI processing time. For example, the time interval T1 may be a predefined processing time to ensure the time required to calculate the full set of CSI values configured to be included in the triggered CSI report. For example, the time interval T1 may refer to the symbol length Z or Z' or CSI calculation time T obtained from the symbol length Z or Z _proc,CSI Or T' _proc,CSI As defined in section 5.4 of 3gpp TS 38.214. For example, referring to section 5.4 of 3GPP TS 38.214Rel-16, when a CSI request field on DCI triggers a CSI report on PUSCH, the UE should provide a valid CSI report for the n-th triggered report if: if the first uplink symbol for carrying the corresponding CSI report including the effect of timing advance is not earlier than symbol Z _ref Initially, and if the first uplink symbol for carrying the nth CSI report including the influence of the timing advance is not earlier than the symbol DCI Z' _ref (n) starting, wherein Z _ref Defined as the next uplink symbol, its CP starts at T after the end of the last symbol of PDCCH triggering CSI reporting _proc,CSI ＝(Z)*(2048+144)*κ*2 ^-u *T _c +T _switch And wherein Z' _ref (n) is defined as the next uplink symbol whose CP is the most recent at the following timeAfter the end of the post symbol, start at T' _proc,CSI ＝(Z')*(2048+144)*κ*2 ^-u *T _c : when aperiodic CSI-RS is used for channel measurement of the nth triggered CSI report, aperiodic CSI-RS resources for channel measurement, aperiodic CSI-IM for interference measurement, and aperiodic NZP CSI-RS for measurement, and wherein only Z in table 7 is applied ₁ Only when T is applied _switch . As described above, Z, Z' and u can be defined as follows: z=max _{m＝0,...,M-1} (Z (m)) and Z' =max _{m＝0,...,M-1} (Z' (m)). Here, M represents the number of updated CSI reports, (Z (M), Z' (M)) corresponds to the mth updated CSI report and is defined as (Z) in table 7 according to a predetermined condition ₁ ，Z ₁ '), table 8 (Z) ₁ ，Z ₁ '), table 8 (Z) ₃ ，Z ₃ ') or (Z) in Table 8 ₂ ，Z ₂ ')。

The UE may perform partial CSI reporting based on a time interval between PUSCH/PUCCH resources on which CSI is to be reported and reception of DCI triggering CSI reporting. For example, referring to fig. 10, partial CSI reporting may be performed when a time interval from a last symbol of a PDCCH on which DCI triggering CSI reporting is received to a first symbol of a PUSCH/PUCCH resource on which CSI is to be reported ends is less than a prescribed time interval T2 and greater than or equal to a prescribed time interval T4, where T3> T4.

In the case where the condition is not satisfied: for example, referring to fig. 9, the time interval T1 is when a time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is greater than or equal to a prescribed time interval; or, for example, referring to fig. 10, when a time interval from the end of the last symbol of the PDCCH on which DCI triggering CSI reporting is received to the start of the first symbol of PUSCH/PUCCH resources on which CSI is to be reported is greater than or equal to a prescribed time interval T3, the BS may assume that the UE will perform conventional CSI reporting including all information based on CSI configuration allowing partial CSI reporting.

In other cases where the condition is not satisfied: for example, referring to fig. 9, when a time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is less than a prescribed time interval T2, the BS may assume that the UE will perform conventional CSI reporting including all information based on CSI configuration allowing partial CSI reporting. For this, the BS may assume that the UE will determine a measurement resource whose time interval from the end of the last symbol of the measurement resource to be used to the start of the first symbol of the PUSCH/PUCCH resource on which CSI is to be reported is greater than a prescribed time interval T1 as a new measurement resource of the corresponding CSI report.

< implementation B1-1> CSI indicator for partial CSI reporting

When the UE transmits the partial CSI by performing the partial CSI report according to a predetermined condition as described in embodiment A1/B1, the UE may arbitrarily perform the partial CSI report or the full CSI report according to circumstances. That is, when the UE performs partial CSI reporting according to a predetermined condition and when it is determined whether the condition is satisfied based on information derived by the UE, the BS may not predict whether the UE will perform partial CSI reporting or complete CSI reporting. In addition, when the BS does not know the total bit size of UL transmissions performed by the UE, the BS may have difficulty in performing decoding on the corresponding UL transmissions. Thus, the UE may need to indicate to the BS whether the UL transmission is a partial CSI report or a full CSI report. To indicate whether to perform partial CSI reporting, at least one of the following methods may be used. In addition, the BS may receive CSI reports from the UE by assuming the following method.

* The BS may assume that the UE encodes bit information of a predefined length representing the total bit length of the CSI report separately from the CSI report, and then appends the bit information of the predefined length to the CSI report.

* The BS may assume that the UE will separately encode 1-bit information indicating whether to perform partial CSI reporting, and then append the 1-bit information to the CSI reporting.

* The BS may assume that the UE will use different CRC masks for partial CSI reporting and full CSI reporting. In this case, the value configured to the UE by each CSI configuration may be used as information for the CRC mask.

* The BS may assume that the UE will use different scrambling sequences for partial CSI reporting and full CSI reporting. In this case, the value configured to the UE by each CSI configuration may be used as information for deriving the scrambling sequence.

* The BS may assume that the UE will use different PUCCH resources for partial CSI reporting and full CSI reporting. For this, PUCCH resources to be used for partial CSI reporting may be additionally configured in CSI configuration provided to the UE.

* The BS may assume that the UE will perform reporting by including partial CSI reports in part 2 of the prior art type I and type IICSI. According to 3gpp TS 38.214, for CSI feedback on PUSCH, e.g. type I CSI, type IICSI and enhanced type IICSI, the CSI report consists of two parts. Portion 1 has a fixed payload size and is used to identify the number of information bits in portion 2. The entire content of part 1 is sent before part 2. In other words, the BS may assume that the UE will include the partial CSI report in part 2. And indicates whether partial CSI is included through part 1. Thus, the BS can estimate the bit length of the part 2 by receiving and decoding the part 1 of a fixed bit length, and successfully receive the partial CSI report. For the above operation, information indicating whether to perform partial CSI reporting may be included in part 1 of CSI.

* The BS may assume that the UE will perform CSI reporting by adding partial CSI reporting to conventional type I and type IICSI as additional part 3. According to 3gpp TS 38.214, for CSI feedback on PUSCH, e.g. type I CSI, type IICSI and enhanced type IICSI, the CSI report consists of two parts. Portion 1 has a fixed payload size and is used to identify the number of information bits in portion 2. The entire content of part 1 is sent before part 2. If the UE includes a partial CSI report in the new part 3 and indicates whether the partial CSI is included through part 1, the UE may inform whether the partial CSI report is included, not only without any change to the existing partial 2CSI, but also without ambiguity in bit size. Thus, the BS can estimate the bit length of the part 2 by receiving and decoding the part 1 of a fixed bit length, and successfully receive the partial CSI report. For the above operation, information indicating whether to perform partial CSI reporting may be included in part 1 of CSI. The corresponding information may be encoded separately from other values in part 1 of CSI. In addition, the CSI part 3 newly added in the above operation may be encoded separately from other CSI parts.

* The BS may assume that the UE will include a portion of the partial CSI in part 1 of the conventional types I and IICSI and the rest of the partial CSI in part 2 thereof. In this case, the partial CSI included in the part 1 may be always transmitted whenever the corresponding CSI report is transmitted, regardless of whether a predetermined condition is satisfied. Alternatively, the partial CSI included in the part 1 may always be zero-padded as much as the size of the bit to be transmitted, and then transmitted. The partial CSI included in the part 2 may be transmitted according to whether a predetermined condition is satisfied. In this case, the CSI included in the part 1 may consist of information on a specific subband (such as a subband having an even or odd index). Therefore, even if the BS fails to receive the partial 2CSI due to ambiguity, the BS can receive CSI on all radio resources through the part 1.

< implementation B2> hierarchical CSI configuration for partial CSI reporting

The BS may provide the UE with two or more CSI configurations to enable the UE to perform partial CSI reporting. In this case, among CSI configurations, one or more CSI configurations X may be used for partial CSI reporting, and one or more other CSI configurations Y may be used for general CSI reporting. Each CSI configuration configured for the partial CSI report may be associated with one or more CSI configurations Y. For example, CSI configuration X may be configured to have one or more CSI configurations Y as a reference CSI configuration. Alternatively, for one CSI configuration Y, a parent-child relationship may be established, with Y as the parent and X as the child.

When at least one of the conditions shown in implementation A1/B1 is satisfied for CSI configuration Y, the BS may assume that the UE will consider to trigger partial CSI reporting for CSI configuration X associated with CSI configuration Y. Thus, the BS may assume that the UE will perform partial CSI reporting. For example, the BS may assume that the partial CSI report is to be triggered to the UE based on another CSI configuration associated with the partial CSI configuration X. Thus, the BS may assume that the UE will perform partial CSI reporting. Such triggering may be performed based on CSI reported through other CSI configurations.

< implementation B3> PUCCH resource selection for partial CSI reporting

In some scenario-based systems (e.g., NR Rel-16 based systems), a UE may determine a PUCCH to use based on the size of all UCI bits to be included in the PUCCH for PUCCH transmission and a set of PUCCH resources indicated or configured for the corresponding PUCCH transmission. If multiple PUCCH transmissions overlap in time, the PUCCH to be used may be determined based on the size of all UCI bits to be transmitted in the overlapping PUCCH and the type of UCI (e.g., SR, HARQ-ACK, CSI, etc.).

When selecting PUCCH resources, the UE and the BS may assume a specific value of UCI size of the partial CSI report. The specific value may be determined whether or not the partial CSI report is actually performed.

If the partial CSI report is transmitted only when a predetermined condition is satisfied, the UE and the BS may assume that the partial CSI report is always transmitted on the configured resources, and then select PUCCH resources for CSI reporting.

< implementation B4> extended CQI bit range

However, if a 3-bit differential CQI table or a 4-bit CQI table is always used for all subbands, CSI overhead may increase. To solve this problem, at least one of the following methods may be considered.

* Method 1: the MSB of the bit sequence including the part 1CSI or the sub-band CQI may contain the bit length of all or part of the sub-band CQI. The BS may assume that the UE expands the per-subband CQI to a bit length to be used for the CQI and reports the subband CQI as partial 2CSI. The UE is allowed to transmit the extended CQI information only when the UE needs to transmit the extended CQI information. For example, the BS may assume that the UE is to report CSI by: one bit indicating a bit length to be used for the sub-band CQI (e.g., "0" =conventional and "1" =extended to three bits) is included in the part 1CSI, and the sub-band CQI to which the extended CQI bit range is applied is included in the part 2CSI. Upon receiving the CSI, the BS may interpret the subband CQI to be reported in the partial 2CSI.

In addition, in some implementations of the present disclosure, subband CSI reports to which the extended CQI bit range is applied may be assigned a higher priority than other CSI reports. For example, when the priority of CSI reports is determined as follows, the value of y or k may be determined according to whether the extended CQI bit range is applied: CSI reporting and Pri _iCSI (y,k,c,s)＝2*N _cells *M _s *y+N _cells *M _s *k+M _s * The priority value of c+s is associated, wherein:

>c is the serving cell index, N _cells Values of higher layer parameters maxNrofServingCells provided for BS; and

>s is reportConfigID, M _s The value of the higher layer parameter maxNrofCSI-ReportConfigurations provided for the BS.

Pri for the first CSI report if compared to the second CSI report _iCSI The association value of (y, k, c, s) is lower, the first CSI report may be said to have a higher priority than the second CSI report.

In some implementations of the disclosure, the UE and BS may configure higher layer parameters (e.g., parameters of CSI-ReportConfig, parameters of CSI-ResourceConfig, etc.) required for CSI reporting. If the condition for triggering the partial CSI report is satisfied according to some implementations of the present disclosure, the UE re-uses separately configured PUCCH resources or PUCCH resources for conventional CSI reporting (e.g., existing PUCCH resources configured for conventional CSI reporting) in order to perform the partial CSI report. The BS may expect the UE to perform partial CSI reporting only when the conditions according to some implementations of the present disclosure are satisfied. The BS may then receive the CSI report from the UE and perform decoding thereon. Alternatively, in some implementations of the present disclosure, the BS may identify the partial CSI report performed by the UE by performing blind decoding of the partial CSI report or based on an indicator included in the CSI transmission. The BS may then receive and decode the partial CSI report.

According to some implementations of the present disclosure, the UE may transmit CSI that does not contain certain content (e.g., certain CSI parameters), thereby reducing CSI processing time of the UE. Accordingly, the UE can reduce a delay time required to report the overall channel state and report to the BS CSI with high accuracy. Considering that the UE uses less information for CSI reporting, the BS may use less radio resources to achieve the same level of reliability, which may help to save overall UL system resources.

The UE may perform operations associated with transmission of CSI reports according to some implementations of the disclosure. The UE may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The processing device for the UE may include: at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer-readable (non-transitory) storage medium may store at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer program or computer program product may include instructions stored on at least one computer-readable (non-volatile) storage medium and which, when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure. In a UE, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, operations may include: receiving an RRC configuration related to CSI reporting; receiving trigger information, which triggers reporting of CSI value sets configured by RRC configuration; determining measurement resources for CSI reporting and UL resources for CSI reporting based on the radio resource configuration and the trigger information; and performing partial CSI reporting based on the time difference between the measurement resources and the UL resources satisfying a predetermined condition, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the UL resources.

In some implementations, the predetermined condition may include a time difference that is less than a CSI calculation time T1 predefined based on a complete CSI report in which the entire configured CSI value set is calculated, and greater than a time T2 based on an end of measurement resources for the partial CSI report.

In some implementations, the operations may include performing a full CSI report based on the time difference being greater than T2, wherein the entire set of CSI values is calculated and the calculated set of CSI values is transmitted on UL resources.

In some implementations, the measurement resources may be no later than the UL resources.

In some implementations, the RRC configuration may include a CSI configuration for partial CSI reporting.

In some implementations, with respect to operation, performing the partial CSI report may include transmitting additional information regarding the partial CSI report on the uplink resource.

The BS may perform operations regarding reception of CSI reports according to some implementations of the present disclosure. The BS may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The processing means for the BS may include: at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer-readable (non-transitory) storage medium may store at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer program or computer program product may include instructions stored on at least one computer-readable (non-volatile) storage medium and which, when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure. In a BS, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, operations may include: transmitting an RRC configuration related to the CSI report to the UE; transmitting trigger information to the UE, the trigger information triggering reporting of the CSI value set configured by the RRC configuration; receiving trigger information triggering reporting of a CSI value set configured by RRC configuration; determining measurement resources for CSI reporting and UL resources for CSI reporting based on the radio resource configuration and the trigger information; and receiving a partial CSI report based on a time difference between the measurement resources and the UL resources satisfying a predetermined condition, wherein only a portion of the CSI value set is received on the UL resources.

In some implementations, the operations may include receiving a full CSI report based on a time difference greater than T2, wherein the entire CSI value set is calculated and the calculated CSI value set is received on UL resources.

In some implementations, with respect to operation, performing the partial CSI report may include receiving additional information regarding the partial CSI report on UL resources.

Examples of the disclosure as described above have been presented to enable one of ordinary skill in the art to make and practice the disclosure. Although the present disclosure has been described with reference to examples, various modifications and changes may be made by those skilled in the art in the examples of the present disclosure. Thus, the present disclosure is not intended to be limited to the examples set forth herein but is to be accorded the widest scope consistent with the principles and features disclosed herein.

INDUSTRIAL APPLICABILITY

Implementations of the present disclosure may be used in a BS, a UE, or other device in a wireless communication system.

Claims

1. A method of transmitting a Channel State Information (CSI) report by a User Equipment (UE) in a wireless communication system, the method comprising:

receiving a radio resource control configuration related to CSI reporting;

receiving trigger information that triggers reporting of a CSI value set configured by the radio resource control configuration;

determining measurement resources for the CSI report and uplink resources for the CSI report based on the radio resource configuration and the trigger information; and

based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, partial CSI reporting is performed, wherein only a portion of the CSI value set is calculated and the calculated CSI value is transmitted on the uplink resources.

2. The method of claim 1, wherein the predetermined condition comprises:

the time difference is less than a CSI calculation time T1 predefined based on a complete CSI report in which the entire configured CSI value set is calculated, and is greater than a time T2 based on the end of measurement resources for the partial CSI report.

3. The method according to claim 2, comprising: based on the time difference being greater than T2, the full CSI report is performed, wherein the entire set of CSI values is calculated and the calculated set of CSI values is transmitted on the uplink resources.

4. The method of claim 1, wherein the measurement resources are no later than the uplink resources.

5. The method of claim 1, wherein the radio resource control configuration comprises a CSI configuration for the partial CSI report.

6. The method of claim 1, wherein performing the partial CSI report comprises: additional information about the partial CSI report is transmitted on the uplink resources.

7. A User Equipment (UE) configured to transmit Channel State Information (CSI) reports in a wireless communication system, the UE comprising:

at least one transceiver;

at least one processor; and

at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:

Receiving a radio resource control configuration related to CSI reporting;

8. A processing apparatus in a wireless communication system, the processing apparatus comprising:

at least one processor; and

receiving a radio resource control configuration related to a Channel State Information (CSI) report;

9. A computer-readable storage medium configured to store at least one program code, the at least one program code comprising instructions that, when executed, cause at least one processor to perform operations comprising:

determining measurement resources for CSI reporting and uplink resources for the CSI reporting based on the radio resource configuration and the trigger information; and

10. A method of receiving Channel State Information (CSI) reports by a Base Station (BS) in a wireless communication system, the method comprising:

transmitting a radio resource control configuration related to CSI reporting to a User Equipment (UE);

transmitting trigger information to the UE, the trigger information triggering reporting of a CSI value set configured by the radio resource control configuration;

receiving the trigger information, the trigger information triggering reporting of the CSI value set configured by the radio resource control configuration;

a partial CSI report is received based on a time difference between the measurement resources and the uplink resources satisfying a predetermined condition, wherein only a portion of the CSI value set is received on the uplink resources.

11. The method of claim 10, wherein the predetermined condition comprises:

12. The method of claim 11, comprising:

based on the time difference being greater than T2, the full CSI report is received, wherein the entire set of CSI values is calculated and the calculated set of CSI values is received on the uplink resources.

13. The method of claim 10, wherein the measurement resources are no later than the uplink resources.

14. The method of claim 10, wherein the radio resource control configuration comprises a CSI configuration for the partial CSI report.

15. The method of claim 10, wherein receiving the partial CSI report comprises: additional information regarding the partial CSI report is received on the uplink resource.

16. A Base Station (BS) configured to receive Channel State Information (CSI) reports in a wireless communication system, the BS comprising:

at least one transceiver;

at least one processor; and

receiving trigger information that triggers reporting of the set of CSI values configured by the radio resource control configuration;