WO2023287095A1 - 무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 장치 - Google Patents
무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 장치 Download PDFInfo
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Definitions
- the present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving channel state information in a wireless communication system.
- Mobile communication systems have been developed to provide voice services while ensuring user activity.
- the mobile communication system has expanded its scope to data services as well as voice.
- the explosive increase in traffic causes a shortage of resources and users demand higher-speed services, so a more advanced mobile communication system is required. there is.
- next-generation mobile communication system The requirements of the next-generation mobile communication system are to support explosive data traffic, drastic increase in transmission rate per user, significantly increased number of connected devices, very low end-to-end latency, and high energy efficiency.
- Dual Connectivity Massive MIMO (Massive Multiple Input Multiple Output), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Wideband Wideband) support, various technologies such as device networking (Device Networking) are being studied.
- Massive MIMO Massive Multiple Input Multiple Output
- NOMA Non-Orthogonal Multiple Access
- Super Wideband Wideband various technologies such as device networking (Device Networking) are being studied.
- a technical problem of the present disclosure is to provide a method and apparatus for transmitting and receiving channel state information in a wireless communication system.
- an additional technical problem of the present disclosure is to provide a method and apparatus for transmitting and receiving channel state information considering a channel state at a data scheduling time point in an evolved wireless communication system.
- an additional technical problem of the present disclosure is to provide a method and apparatus for transmitting and receiving information related to omission of channel state information in an evolved wireless communication system.
- a method for performing channel state information (CSI) reporting by a terminal in a wireless communication system includes: receiving, from a base station, configuration information related to the CSI reporting; Receiving, from the base station, control information based on the setting information; And based on the configuration information and the control information, performing the CSI reporting, based on the fact that data scheduling by the base station will be performed after the CSI reporting, the CSI reporting of the data scheduling It may be based on information about a channel state at a point in time.
- a method for receiving a channel state information (CSI) report by a base station in a wireless communication system includes: transmitting, to a terminal, configuration information related to the CSI report; Transmitting, to the terminal, control information based on the setting information; And receiving, from the terminal, the CSI report based on the configuration information and the control information, based on the fact that data scheduling by the base station will be performed after the CSI report, the CSI report is It may be based on information about a channel state at the time of data scheduling.
- FIG. 1 illustrates the structure of a wireless communication system to which the present disclosure may be applied.
- FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.
- FIG 3 illustrates a resource grid in a wireless communication system to which the present disclosure may be applied.
- FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure may be applied.
- FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure may be applied.
- FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission/reception method using them.
- FIG. 7 illustrates a multiple TRP transmission scheme in a wireless communication system to which the present disclosure can be applied.
- FIG. 8 is a diagram illustrating a downlink transmission/reception operation in a wireless communication system to which the present disclosure may be applied.
- FIG. 9 is a diagram illustrating an uplink transmission/reception operation in a wireless communication system to which the present disclosure may be applied.
- FIG. 11 illustrates a Feed-Forward Neural Network.
- FIG. 13 illustrates a convolutional neural network
- 16 is a diagram illustrating segmented AI inference.
- FIG. 17 illustrates the application of a functional framework in a wireless communication system.
- 20 is a diagram illustrating a signaling procedure between a base station and a terminal for a method for reporting channel state information according to an embodiment of the present disclosure.
- 21 is a diagram illustrating an operation of a terminal for a method for reporting channel state information according to an embodiment of the present disclosure.
- 22 is a diagram illustrating an operation of a base station for a method for reporting channel state information according to an embodiment of the present disclosure.
- FIG. 23 illustrates a block configuration diagram of a wireless communication device according to an embodiment of the present disclosure.
- first and second are used only for the purpose of distinguishing one component from another component and are not used to limit the components, unless otherwise specified. The order or importance among them is not limited. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment. can also be called
- the present disclosure describes a wireless communication network or wireless communication system, and operations performed in the wireless communication network control the network and transmit or receive signals in a device (for example, a base station) in charge of the wireless communication network. It can be done in the process of receiving (receive) or in the process of transmitting or receiving signals from a terminal coupled to the wireless network to or between terminals.
- a device for example, a base station
- transmitting or receiving a channel includes the meaning of transmitting or receiving information or a signal through a corresponding channel.
- transmitting a control channel means transmitting control information or a signal through the control channel.
- transmitting a data channel means transmitting data information or a signal through the data channel.
- downlink means communication from a base station to a terminal
- uplink means communication from a terminal to a base station.
- a transmitter may be part of a base station and a receiver may be part of a terminal.
- a transmitter may be a part of a terminal and a receiver may be a part of a base station.
- a base station may be expressed as a first communication device
- a terminal may be expressed as a second communication device.
- a base station includes a fixed station, a Node B, an evolved-NodeB (eNB), a Next Generation NodeB (gNB), a base transceiver system (BTS), an access point (AP), and a network (5G Network), AI (Artificial Intelligence) system/module, RSU (road side unit), robot, drone (UAV: Unmanned Aerial Vehicle), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.
- AI Artificial Intelligence
- RSU road side unit
- robot UAV: Unmanned Aerial Vehicle
- AR Algmented Reality
- VR Virtual Reality
- a terminal may be fixed or mobile, and a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an advanced mobile (AMS) Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, RSU (road side unit), It can be replaced with terms such as robot, AI (Artificial Intelligence) module, drone (UAV: Unmanned Aerial Vehicle), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.
- AI Artificial Intelligence
- drone UAV: Unmanned Aerial Vehicle
- AR Algmented Reality
- VR Virtual Reality
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented with radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA
- LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE.
- 3GPP NR New Radio or New Radio Access Technology
- 3GPP LTE/LTE-A/LTE-A pro is an evolved version of 3GPP LTE/LTE-A/LTE-A pro.
- LTE refers to technology after 3GPP Technical Specification (TS) 36.xxx Release 8.
- TS Technical Specification
- LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A
- LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro
- 3GPP NR refers to technology after TS 38.xxx Release 15.
- LTE/NR may be referred to as a 3GPP system.
- "xxx" means standard document detail number.
- LTE/NR may be collectively referred to as a 3GPP system.
- TS 36.211 Physical Channels and Modulation
- TS 36.212 Multiplexing and Channel Coding
- TS 36.213 Physical Layer Procedures
- TS 36.300 General Description
- TS 36.331 Radio Resource Control
- TS 38.211 Physical Channels and Modulation
- TS 38.212 Multiplexing and Channel Coding
- TS 38.213 Physical Layer Procedures for Control
- TS 38.214 Physical Layer Procedures for Data
- TS 38.300 General description of NR and New Generation-Radio Access Network (NG-RAN)
- TS 38.331 Radio Resource Control Protocol Specification
- channel state information - reference signal resource indicator channel state information - reference signal resource indicator
- channel state information - reference signal channel state information - reference signal
- Layer 1 reference signal received quality Layer 1 reference signal received quality
- orthogonal frequency division multiplexing orthogonal frequency division multiplexing (orthogonal frequency division multiplexing)
- radio resource control radio resource control
- Synchronization signal block including primary synchronization signal (PSS), secondary synchronization signal (SSS) and physical broadcast channel (PBCH)
- NR is an expression showing an example of 5G RAT.
- a new RAT system including NR uses an OFDM transmission scheme or a transmission scheme similar thereto.
- the new RAT system may follow OFDM parameters different from those of LTE.
- the new RAT system follows the numerology of the existing LTE/LTE-A as it is, but may support a larger system bandwidth (eg, 100 MHz).
- one cell may support a plurality of numerologies. That is, terminals operating with different numerologies can coexist in one cell.
- a numerology corresponds to one subcarrier spacing in the frequency domain.
- Different numerologies can be defined by scaling the reference subcarrier spacing by an integer N.
- FIG. 1 illustrates the structure of a wireless communication system to which the present disclosure may be applied.
- the NG-RAN is a NG-RA (NG-Radio Access) user plane (ie, a new AS (access stratum) sublayer / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC / PHY) and control plane (RRC) protocol termination to the UE.
- the gNBs are interconnected through an Xn interface.
- the gNB is also connected to a New Generation Core (NGC) through an NG interface. More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and to a User Plane Function (UPF) through an N3 interface.
- AMF Access and Mobility Management Function
- UPF User Plane Function
- FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.
- An NR system can support multiple numerologies.
- numerology may be defined by subcarrier spacing and Cyclic Prefix (CP) overhead.
- the multiple subcarrier spacing can be derived by scaling the basic (reference) subcarrier spacing by an integer N (or ⁇ ).
- N or ⁇
- the numerology used can be selected independently of the frequency band.
- various frame structures according to a plurality of numerologies may be supported.
- OFDM numerology and frame structure that can be considered in the NR system will be described.
- Multiple OFDM numerologies supported in the NR system can be defined as shown in Table 1 below.
- NR supports multiple numerologies (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, and when the SCS is 30 kHz/60 kHz, dense-urban, lower latency and a wider carrier bandwidth, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.
- SCS subcarrier spacing
- the NR frequency band is defined as two types of frequency ranges (FR1 and FR2).
- FR1 and FR2 may be configured as shown in Table 2 below.
- FR2 may mean millimeter wave (mmW).
- ⁇ f max 480 10 3 Hz
- N f 4096.
- T TA (N TA +N TA,offset )T c before the start of the corresponding downlink frame in the corresponding terminal.
- slots are numbered in increasing order of n s ⁇ ⁇ 0,..., N slot subframe, ⁇ -1 ⁇ within a subframe, and within a radio frame They are numbered in increasing order n s,f ⁇ ⁇ 0,..., N slot frame, ⁇ -1 ⁇ .
- One slot is composed of consecutive OFDM symbols of N symb slots , and N symb slots are determined according to CP.
- the start of slot n s ⁇ in a subframe is temporally aligned with the start of OFDM symbol n s ⁇ N symb slot in the same subframe. Not all terminals can simultaneously transmit and receive, which means that not all OFDM symbols in a downlink slot or uplink slot can be used.
- Table 3 shows the number of OFDM symbols per slot (N symb slot ), the number of slots per radio frame (N slot frame, ⁇ ), and the number of slots per subframe (N slot subframe, ⁇ ) in the general CP.
- Table 4 represents the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.
- one subframe may include 4 slots.
- a mini-slot may contain 2, 4 or 7 symbols, more or fewer symbols.
- an antenna port a resource grid, a resource element, a resource block, a carrier part, etc. can be considered Hereinafter, the physical resources that can be considered in the NR system will be described in detail.
- the antenna port is defined such that the channel on which a symbol on the antenna port is carried can be inferred from the channel on which other symbols on the same antenna port are carried. If the large-scale properties of the channel on which the symbols on one antenna port are carried can be inferred from the channel on which the symbols on the other antenna port are carried, then the two antenna ports are quasi co-located or QC/QCL (quasi co-located or quasi co-location).
- the wide range characteristic includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
- FIG 3 illustrates a resource grid in a wireless communication system to which the present disclosure may be applied.
- a resource grid is composed of N RB ⁇ N sc RB subcarriers in the frequency domain, and one subframe is composed of 14 2 ⁇ OFDM symbols.
- a transmitted signal is described by one or more resource grids consisting of N RB ⁇ N sc RB subcarriers and 2 ⁇ N symb ( ⁇ ) OFDM symbols.
- N RB ⁇ ⁇ N RB max, ⁇ The N RB max, ⁇ represents the maximum transmission bandwidth, which may vary not only between numerologies but also between uplink and downlink.
- one resource grid may be set for each ⁇ and antenna port p.
- Each element of the resource grid for ⁇ and antenna port p is referred to as a resource element and is uniquely identified by an index pair (k, l').
- l' 0,...,2 ⁇ N symb ( ⁇ ) -1 is a symbol in a subframe indicates the location of
- an index pair (k, l) is used.
- l 0,...,N symb ⁇ -1.
- the resource element (k,l') for ⁇ and antenna port p corresponds to a complex value a k,l' (p, ⁇ ) .
- indices p and ⁇ can be dropped, resulting in a complex value of a k,l' (p) or can be a k,l' .
- Point A serves as a common reference point of the resource block grid and is obtained as follows.
- OffsetToPointA for primary cell (PCell) downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping the SS/PBCH block used by the UE for initial cell selection. It is expressed in resource block units assuming a 15 kHz subcarrier spacing for FR1 and a 60 kHz subcarrier spacing for FR2.
- -absoluteFrequencyPointA represents the frequency-position of point A expressed as in ARFCN (absolute radio-frequency channel number).
- Common resource blocks are numbered upward from 0 in the frequency domain for the subcarrier spacing ⁇ .
- the center of subcarrier 0 of common resource block 0 for subcarrier spacing setting ⁇ coincides with 'point A'.
- the relationship between the common resource block number n CRB ⁇ and the resource elements (k, l) for the subcarrier spacing ⁇ is given by Equation 1 below.
- Physical resource blocks are numbered from 0 to N BWP,i size, ⁇ -1 within a bandwidth part (BWP), where i is the number of BWP.
- BWP bandwidth part
- Equation 2 The relationship between the physical resource block n PRB and the common resource block n CRB in BWP i is given by Equation 2 below.
- N BWP,i start, ⁇ is a common resource block where BWP starts relative to common resource block 0.
- Figure 4 illustrates a physical resource block in a wireless communication system to which the present disclosure may be applied.
- Figure 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.
- a slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 7 symbols, but in the case of an extended CP, one slot includes 6 symbols.
- a carrier includes a plurality of subcarriers in the frequency domain.
- a resource block (RB) is defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain.
- a bandwidth part (BWP) is defined as a plurality of contiguous (physical) resource blocks in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.).
- a carrier may include up to N (eg, 5) BWPs. Data communication is performed through an activated BWP, and only one BWP can be activated for one terminal.
- Each element in the resource grid is referred to as a resource element (RE), and one complex symbol may be mapped.
- RE resource element
- the NR system can support up to 400 MHz per component carrier (CC). If a terminal operating in such a wideband CC always operates with radio frequency (RF) chips for the entire CC turned on, battery consumption of the terminal may increase.
- a terminal operating in such a wideband CC always operates with radio frequency (RF) chips for the entire CC turned on, battery consumption of the terminal may increase.
- RF radio frequency
- different numerologies eg subcarrier spacing, etc.
- the capability for the maximum bandwidth may be different for each terminal.
- the base station may instruct the terminal to operate only in a part of the bandwidth rather than the entire bandwidth of the wideband CC, and the part of the bandwidth is defined as a bandwidth part (BWP) for convenience.
- BWP may be composed of consecutive RBs on the frequency axis and may correspond to one numerology (eg, subcarrier spacing, CP length, slot/mini-slot period).
- the base station may set multiple BWPs even within one CC configured for the terminal. For example, in a PDCCH monitoring slot, a BWP occupying a relatively small frequency domain may be set, and a PDSCH indicated by the PDCCH may be scheduled on a larger BWP. Alternatively, when UEs are concentrated in a specific BWP, some UEs may be set to other BWPs for load balancing. Alternatively, considering frequency domain inter-cell interference cancellation between neighboring cells, some of the spectrum among the entire bandwidth may be excluded and both BWPs may be configured even within the same slot. That is, the base station may configure at least one DL/UL BWP for a terminal associated with a wideband CC.
- the base station may activate at least one DL/UL BWP among the configured DL/UL BWP(s) at a specific time (by L1 signaling or MAC Control Element (CE) or RRC signaling).
- the base station may indicate switching to another configured DL / UL BWP (by L1 signaling or MAC CE or RRC signaling).
- a timer value expires based on a timer, it may be switched to a predetermined DL/UL BWP.
- the activated DL/UL BWP is defined as an active DL/UL BWP.
- the terminal In situations such as when the terminal is performing an initial access process or before an RRC connection is set up, it may not be possible to receive the configuration for DL / UL BWP, so in this situation, the terminal This assumed DL/UL BWP is defined as the first active DL/UL BWP.
- FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission/reception method using them.
- a terminal receives information from a base station through downlink, and the terminal transmits information to the base station through uplink.
- Information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist according to the type/use of the information transmitted and received by the base station and the terminal.
- the terminal When the terminal is turned on or newly enters a cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S601). To this end, the terminal synchronizes with the base station by receiving a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station, and obtains information such as a cell identifier (ID: Identifier). can Thereafter, the UE may acquire intra-cell broadcast information by receiving a Physical Broadcast Channel (PBCH) from the base station. Meanwhile, the terminal may check the downlink channel state by receiving a downlink reference signal (DL RS) in the initial cell search step.
- PSS primary synchronization signal
- SSS secondary synchronization signal
- ID cell identifier
- the UE may acquire intra-cell broadcast information by receiving a Physical Broadcast Channel (PBCH) from the base station.
- PBCH Physical Broadcast Channel
- the terminal may check the downlink channel state by receiving a downlink reference signal (DL RS) in the initial cell
- the UE After completing the initial cell search, the UE acquires more detailed system information by receiving a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH) according to information carried on the PDCCH. It can (S602).
- PDCCH Physical Downlink Control Channel
- PDSCH Physical Downlink Control Channel
- the terminal may perform a random access procedure (RACH) to the base station (steps S603 to S606).
- RACH random access procedure
- the terminal may transmit a specific sequence as a preamble through a physical random access channel (PRACH) (S603 and S605), and receive a response message to the preamble through a PDCCH and a corresponding PDSCH ( S604 and S606).
- PRACH physical random access channel
- a contention resolution procedure may be additionally performed.
- the UE receives PDCCH/PDSCH as a general uplink/downlink signal transmission procedure (S607) and Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel (PUCCH: Physical Uplink Control Channel) transmission (S608) may be performed.
- the terminal receives downlink control information (DCI) through the PDCCH.
- DCI downlink control information
- the DCI includes control information such as resource allocation information for a terminal, and has different formats depending on its purpose of use.
- the control information that the terminal transmits to the base station through the uplink or the terminal receives from the base station is a downlink / uplink ACK / NACK (Acknowledgement / Non-Acknowledgement) signal, CQI (Channel Quality Indicator), PMI (Precoding Matrix) Indicator), RI (Rank Indicator), etc.
- a terminal may transmit control information such as the above-described CQI/PMI/RI through PUSCH and/or PUCCH.
- Table 5 shows an example of a DCI format in the NR system.
- DCI format uses 0_0 Scheduling of PUSCH in one cell 0_1 Scheduling of one or multiple PUSCHs in one cell, or indication of cell group (CG) downlink feedback information to the UE 0_2 Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one DL cell 1_1 Scheduling of PDSCH in one cell 1_2 Scheduling of PDSCH in one cell
- DCI formats 0_0, 0_1, and 0_2 are resource information related to PUSCH scheduling (eg, UL/SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), transport block ( TB: Transport Block) related information (eg, MCS (Modulation Coding and Scheme), NDI (New Data Indicator), RV (Redundancy Version), etc.), HARQ (Hybrid - Automatic Repeat and request) related information (eg, , process number, downlink assignment index (DAI), PDSCH-HARQ feedback timing, etc.), multi-antenna related information (eg, DMRS sequence initialization information, antenna port, CSI request, etc.), power control information (eg, PUSCH power control, etc.), and control information included in each DCI format may be predefined.
- PUSCH scheduling eg, UL/SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.
- DCI format 0_0 is used for PUSCH scheduling in one cell.
- Information included in DCI format 0_0 is a cyclic redundancy check (CRC) by C-RNTI (Cell RNTI: Cell Radio Network Temporary Identifier), CS-RNTI (Configured Scheduling RNTI) or MCS-C-RNTI (Modulation Coding Scheme Cell RNTI) ) is scrambled and transmitted.
- CRC cyclic redundancy check
- C-RNTI Cell RNTI: Cell Radio Network Temporary Identifier
- CS-RNTI Configured Scheduling RNTI
- MCS-C-RNTI Modulation Coding Scheme Cell RNTI
- DCI format 0_1 is used to instruct the UE to schedule one or more PUSCHs in one cell or configured grant (CG: configure grant) downlink feedback information.
- Information included in DCI format 0_1 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI (Semi-Persistent CSI RNTI) or MCS-C-RNTI.
- DCI format 0_2 is used for PUSCH scheduling in one cell.
- Information included in DCI format 0_2 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI or MCS-C-RNTI.
- DCI formats 1_0, 1_1, and 1_2 are resource information related to PDSCH scheduling (eg, frequency resource allocation, time resource allocation, VRB (virtual resource block)-PRB (physical resource block) mapping, etc.), transport block (TB) related information (eg, MCS, NDI, RV, etc.), HARQ related information (eg, process number, DAI, PDSCH-HARQ feedback timing, etc.), multi-antenna related information (eg, antenna port , transmission configuration indicator (TCI), sounding reference signal (SRS) request, etc.), PUCCH-related information (eg, PUCCH power control, PUCCH resource indicator, etc.), and the control information included in each DCI format can be predefined.
- PDSCH scheduling eg, frequency resource allocation, time resource allocation, VRB (virtual resource block)-PRB (physical resource block) mapping, etc.
- transport block (TB) related information eg, MCS, NDI, RV, etc.
- HARQ related information
- DCI format 1_0 is used for PDSCH scheduling in one DL cell.
- Information included in DCI format 1_0 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI or MCS-C-RNTI.
- DCI format 1_1 is used for PDSCH scheduling in one cell.
- Information included in DCI format 1_1 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI or MCS-C-RNTI.
- DCI format 1_2 is used for PDSCH scheduling in one cell.
- Information included in DCI format 1_2 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI or MCS-C-RNTI.
- CoMP Coordinated Multi Point
- a plurality of base stations exchange channel information (eg, RI/CQI/PMI/layer indicator (LI)) received as feedback from a terminal (eg, It refers to a method of effectively controlling interference by cooperatively transmitting to a terminal by using or utilizing the X2 interface.
- CoMP includes joint transmission (JT), coordinated scheduling (CS), coordinated beamforming (CB), dynamic point selection (DPS), and dynamic point blocking ( DPB: Dynamic Point Blocking).
- the M-TRP transmission method in which M TRPs transmit data to one terminal is largely divided into i) eMBB M-TRP transmission, which is a method for increasing the transmission rate, and ii) URLLC M, which is a method for increasing the reception success rate and reducing latency. It can be classified as -TRP transmission.
- the M-TRP transmission method is i) multiple DCI (M-DCI) based M-TRP transmission in which each TRP transmits a different DCI and ii) S-DCI in which one TRP transmits DCI (single DCI) based M-TRP transmission.
- M-DCI multiple DCI
- S-DCI single DCI
- scheme 3/4 is under standardization discussion.
- scheme 4 means a method in which one TRP transmits a transport block (TB) in one slot, and has an effect of increasing the probability of data reception through the same TB received from multiple TRPs in multiple slots.
- Scheme 3 means a method in which one TRP transmits TB through several consecutive OFDM symbols (ie, symbol groups), and several TRPs within one slot transmit the same TB through different symbol groups. can be set to transmit.
- the UE transmits the PUSCH (or PUCCH) scheduled by the DCI received with different control resource sets (CORESETs) (or CORESETs belonging to different CORESET groups) to different TRPs. , or may be recognized as PDSCH (or PDCCH) of different TRPs.
- CORESETs control resource sets
- PDSCH or PDCCH
- a scheme for UL transmission eg, PUSCH/PUCCH
- UL transmission eg, PUSCH/PUCCH
- MTRP-URLLC may mean that the same transport block (TB) is transmitted using a different layer/time/frequency of the M-TRP.
- a UE configured for the MTRP-URLLC transmission method may be instructed by DCI of various TCI state(s), and it may be assumed that data received using the QCL RS of each TCI state are the same TB.
- MTRP-eMBB may mean that M-TRP transmits another TB using a different layer/time/frequency. It can be assumed that the UE configured for the MTRP-eMBB transmission method receives several TCI state(s) through DCI, and data received using the QCL RS of each TCI state is a different TB.
- the UE separately uses the RNTI set for MTRP-URLLC and the RNTI set for MTRP-eMBB, it is possible to determine/determine whether the corresponding M-TRP transmission is URLLC transmission or eMBB transmission. That is, if CRC masking of the DCI received by the UE is performed using the RNTI set for MTRP-URLLC, this corresponds to URLLC transmission, and CRC masking of DCI is performed using the RNTI set for MTRP-eMBB , this may correspond to eMBB transmission.
- the CORESET group identifier (group ID) described/mentioned in the present disclosure may mean an index/identification information (eg, ID) for distinguishing CORESETs for each TRP/panel.
- the CORESET group may be a group/union of CORESETs classified by an index/identification information (eg, ID)/the CORESET group ID for distinguishing CORESETs for each TRP/panel.
- the CORESET group ID may be specific index information defined in CORSET configuration.
- the CORESET group can be set/instructed/defined by an index defined in the CORESET configuration for each CORESET.
- the CORESET group ID may mean an index/identification information/indicator for classifying/identifying between CORESETs set/related to each TRP/panel.
- the CORESET group ID described/mentioned in the present disclosure may be expressed by being replaced with a specific index/specific identification information/specific indicator for distinguishing/identifying between CORESETs set/related to each TRP/panel.
- the CORESET group ID that is, a specific index/specific identification information/specific indicator for distinguishing/identifying between CORESETs set in/associated with each TRP/panel, is higher layer signaling (eg, RRC signaling)/second It may be set/instructed to the UE through layer signaling (L2 signaling, eg, MAC-CE)/first layer signaling (L1 signaling, eg, DCI).
- L2 signaling eg, MAC-CE
- L1 signaling eg, DCI
- PDCCH detection may be performed for each TRP/panel (ie, for each TRP/panel belonging to the same CORESET group) in units of a corresponding CORESET group.
- Uplink control information eg, CSI, HARQ-A / N (ACK / NACK), SR (for example, CSI, HARQ-A / N (ACK / NACK), SR (for each TRP / panel belonging to the same CORESET group) for each TRP / panel per CORESET group)) scheduling request
- uplink physical channel resources eg, PUCCH/PRACH/SRS resources
- a ControlResourceSet information element which is a higher layer parameter, is used to set a time/frequency control resource set (CORESET).
- the control resource set (CORESET) may be related to detection and reception of downlink control information.
- the ControlResourceSet IE is a CORESET related ID (eg, controlResourceSetID) / index of a CORESET pool for CORESET (eg, CORESETPoolIndex) / time / frequency resource setting of CORESET / TCI information related to CORESET, etc. can include
- the index of the CORESET pool (eg, CORESETPoolIndex) may be set to 0 or 1.
- the CORESET group may correspond to a CORESET pool
- the CORESET group ID may correspond to a CORESET pool index (eg, CORESETPoolIndex).
- Non-coherent joint transmission is a method in which multiple transmission points (TPs) transmit data to one terminal using the same time and frequency resources. Data is transmitted through different layers (ie, different DMRS ports).
- the TP delivers data scheduling information to the terminal receiving the NCJT through DCI.
- a method in which each TP participating in NCJT transfers scheduling information for data transmitted by itself to DCI is referred to as 'multi DCI based NCJT'. Since the N TPs participating in NCJT transmission transmit DL grant DCIs and PDSCHs to the UE, the UE receives N DCIs and N PDSCHs from the N TPs. Unlike this, a method in which one representative TP transfers scheduling information for data transmitted by itself and data transmitted by other TPs (ie, TPs participating in NCJT) to one DCI is referred to as 'single DCI based NCJT'. )'.
- N TPs transmit one PDSCH, but each TP transmits only some layers of multiple layers constituting one PDSCH. For example, when 4 layer data is transmitted, TP 1 may transmit layer 2 and TP 2 may transmit the remaining 2 layers to the UE.
- NCJP partially overlapped NCJP
- NCJT can be divided into a fully overlapped NCJT in which time-frequency resources transmitted by each TP completely overlap and a partially overlapped NCJT in which only some time-frequency resources are overlapped. That is, in the case of partially overlapped NCJT, both data of TP 1 and TP2 are transmitted in some time-frequency resources, and only data of one of TP 1 or TP 2 is transmitted in the remaining time-frequency resources.
- the following two methods can be considered as transmission/reception methods for improving reliability using transmission in multiple TRPs.
- FIG. 7 illustrates a multiple TRP transmission scheme in a wireless communication system to which the present disclosure can be applied.
- the layer group may mean one or a predetermined layer set composed of one or more layers.
- the amount of transmission resources increases due to the number of layers, and through this, there is an advantage that robust channel coding of a low code rate can be used for TB, and also, since the channels are different from multiple TRPs, diversity ), the reliability of the received signal can be expected to be improved based on the gain.
- FIG. 7(b) an example of transmitting different CWs through layer groups corresponding to different TRPs is shown.
- TBs corresponding to CW #1 and CW #2 in the figure are the same. That is, CW #1 and CW #2 mean that the same TB is converted into different CWs through channel coding or the like by different TRPs. Therefore, it can be regarded as an example of repeated transmission of the same TB.
- a code rate corresponding to TB may be higher than that of FIG. 7(a).
- the code rate can be adjusted by indicating different RV (redundancy version) values for the encoded bits generated from the same TB, or the modulation order of each CW can be adjusted. has the advantage of being
- the same TB is repeatedly transmitted through different layer groups, and as each layer group is transmitted by different TRP / panel, the terminal receives data can increase your odds.
- This is referred to as a Spatial Division Multiplexing (SDM) based M-TRP URLLC transmission scheme.
- SDM Spatial Division Multiplexing
- Layers belonging to different layer groups are transmitted through DMRS ports belonging to different DMRS CDM groups.
- FIG. 8 is a diagram illustrating a downlink transmission/reception operation in a wireless communication system to which the present disclosure may be applied.
- the base station schedules downlink transmission such as frequency/time resources, transport layer, downlink precoder, and MCS (S1401).
- the base station may determine a beam for PDSCH transmission to the terminal through the above-described operations.
- the UE receives DCI for downlink scheduling (ie, including PDSCH scheduling information) on the PDCCH from the base station (S1402).
- DCI for downlink scheduling ie, including PDSCH scheduling information
- DCI format 1_0, 1_1 or 1_2 may be used for downlink scheduling, and in particular, DCI format 1_1 includes the following information: DCI format identifier (Identifier for DCI formats), bandwidth part indicator, Frequency domain resource assignment, time domain resource assignment, PRB bundling size indicator, rate matching indicator, ZP CSI-RS trigger (ZP CSI -RS trigger), antenna port(s), transmission configuration indication (TCI), SRS request, demodulation reference signal (DMRS) sequence initialization (DMRS sequence initialization)
- the number of DMRS ports can be scheduled, and SU (Single-user) / MU (Multi-user) transmission scheduling is possible.
- the TCI field is composed of 3 bits, and the QCL for the DMRS is dynamically indicated by indicating up to 8 TCI states according to the TCI field value.
- the terminal receives downlink data from the base station on the PDSCH (S1403).
- the PDSCH is decoded according to an instruction by the corresponding DCI.
- the UE may set the DMRS configuration type by the upper layer parameter 'dmrs-Type', and the DMRS type is used to receive the PDSCH.
- the maximum number of front-loaded DMRA symbols for the PDSCH may be set by the upper layer parameter 'maxLength'.
- DMRS configuration type 1 if a single codeword is scheduled for a UE and an antenna port mapped with an index of ⁇ 2, 9, 10, 11, or 30 ⁇ is designated, or a single codeword is scheduled and ⁇ 2, If an antenna port mapped with an index of 9, 10, 11, or 12 ⁇ or ⁇ 2, 9, 10, 11, 30, or 31 ⁇ is specified, or if two codewords are scheduled for a UE, the UE selects all remaining orthogonal It is assumed that one antenna port is not associated with PDSCH transmission to another terminal.
- DMRS configuration type 2 if a single codeword is scheduled for the UE and an antenna port mapped with an index of ⁇ 2, 10, or 23 ⁇ is designated, or a single codeword is scheduled and ⁇ 2, 10, If an antenna port mapped with an index of 23 or 24 ⁇ or ⁇ 2, 10, 23, or 58 ⁇ is specified, or if two codewords are scheduled for a UE, the UE transmits all remaining orthogonal antenna ports to another UE. It is assumed that it is not associated with PDSCH transmission of
- the precoding granularity P' is a contiguous resource block in the frequency domain.
- P' may correspond to one of ⁇ 2, 4, broadband ⁇ .
- P' is determined as wideband, the UE does not expect to be scheduled with non-contiguous PRBs, and the UE can assume that the same precoding is applied to the allocated resource.
- the Precoding Resource Block Group (PRG) is divided into P' consecutive PRBs.
- the number of actually consecutive PRBs in each PRG may be one or more.
- the UE may assume that the same precoding is applied to consecutive downlink PRBs in the PRG.
- the UE In order for the UE to determine the modulation order, target code rate, and transport block size in the PDSCH, the UE first reads the 5-bit MCD field in the DCI, and modulates the modulation order and target code determine the rate. Then, the redundancy version field in the DCI is read, and the redundancy version is determined. And, the UE determines the transport block size using the number of layers and the total number of allocated PRBs before rate matching.
- FIG. 9 is a diagram illustrating an uplink transmission/reception operation in a wireless communication system to which the present disclosure may be applied.
- the base station schedules uplink transmission such as frequency/time resources, transport layers, uplink precoders, and MCS (S1501).
- the base station may determine a beam for the UE to transmit the PUSCH through the above-described operations.
- the terminal receives DCI for uplink scheduling (ie, including PUSCH scheduling information) from the base station on the PDCCH (S1502).
- DCI for uplink scheduling ie, including PUSCH scheduling information
- DCI format 0_0, 0_1 or 0_2 may be used for uplink scheduling, and in particular, DCI format 0_1 includes the following information: DCI format identifier (Identifier for DCI formats), UL/SUL (Supplementary uplink) indicator ( UL / SUL indicator), bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, frequency hopping flag, modulation and coding scheme (MCS: Modulation and coding scheme), SRS resource indicator (SRI), precoding information and number of layers, antenna port(s), SRS request (SRS request), DMRS sequence initialization, UL-SCH (Uplink Shared Channel) indicator (UL-SCH indicator)
- SRS resources set in the SRS resource set associated with the higher layer parameter 'usage' may be indicated by the SRS resource indicator field.
- 'spatialRelationInfo' can be set for each SRS resource, and its value can be one of ⁇ CRI, SSB, SRI ⁇ .
- the terminal transmits uplink data to the base station on the PUSCH (S1503).
- the corresponding PUSCH is transmitted according to an instruction by the corresponding DCI.
- codebook-based transmission For PUSCH transmission, two transmission schemes are supported: codebook-based transmission and non-codebook-based transmission:
- the terminal When the upper layer parameter 'txConfig' is set to 'codebook', the terminal is configured for codebook-based transmission. On the other hand, when the upper layer parameter 'txConfig' is set to 'nonCodebook', the terminal is configured for non-codebook based transmission. If the upper layer parameter 'txConfig' is not set, the terminal does not expect to be scheduled by DCI format 0_1. When PUSCH is scheduled by DCI format 0_0, PUSCH transmission is based on a single antenna port.
- PUSCH may be scheduled in DCI format 0_0, DCI format 0_1, DCI format 0_2, or semi-statically. If this PUSCH is scheduled by DCI format 0_1, the UE transmits the PUSCH based on SRI, TPMI (Transmit Precoding Matrix Indicator) and transmission rank from DCI, as given by the SRS resource indicator field and Precoding information and number of layers field Determine the precoder.
- TPMI Transmit Precoding Matrix Indicator
- TPMI Transmit Precoding Matrix Indicator
- transmission rank from DCI, as given by the SRS resource indicator field and Precoding information and number of layers field Determine the precoder.
- TPMI is used to indicate a precoder to be applied across antenna ports, and corresponds to an SRS resource selected by SRI when multiple SRS resources are configured.
- TPMI is used to indicate a precoder to be applied across antenna ports and corresponds to the single SRS resource.
- a transmission precoder is selected from an uplink codebook having the same number of antenna ports as the upper layer parameter 'nrofSRS-Ports'.
- the terminal is configured with at least one SRS resource.
- the SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS resource precedes the PDCCH carrying the SRI (i.e., slot n).
- PUSCH may be scheduled in DCI format 0_0, DCI format 0_1 or semi-statically.
- the UE can determine the PUSCH precoder and transmission rank based on the wideband SRI, where the SRI is given by the SRS resource indicator in the DCI or by the higher layer parameter 'srs-ResourceIndicator' given
- the UE uses one or multiple SRS resources for SRS transmission, where the number of SRS resources may be configured for simultaneous transmission within the same RB based on UE capabilities. Only one SRS port is configured for each SRS resource. Only one SRS resource can be set with the upper layer parameter 'usage' set to 'nonCodebook'.
- the maximum number of SRS resources that can be configured for non-codebook based uplink transmission is 4.
- the SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS transmission precedes the PDCCH carrying the SRI (i.e., slot n).
- channel state information-reference signal In a New Radio (NR) system, channel state information-reference signal (CSI-RS) is time and / or frequency tracking (time / frequency tracking), CSI calculation (computation), L1 (layer 1) - RSRP (reference signal received It is used for power computation and mobility.
- CSI computation is related to CSI acquisition
- L1-RSRP computation is related to beam management (BM).
- Channel state information refers to information that can indicate the quality of a radio channel (or also referred to as a link) formed between a terminal and an antenna port.
- a terminal eg, user equipment, UE transmits configuration information related to CSI to a base station (eg, general node) through RRC (radio resource control) signaling B, gNB).
- RRC radio resource control
- the CSI-related configuration information includes CSI-interference management (IM) resource-related information, CSI measurement configuration-related information, CSI resource configuration-related information, and CSI-RS resource-related information. Alternatively, at least one of information related to CSI report configuration may be included.
- IM CSI-interference management
- CSI-IM resource related information may include CSI-IM resource information, CSI-IM resource set information, and the like.
- a CSI-IM resource set is identified by a CSI-IM resource set ID (identifier), and one resource set includes at least one CSI-IM resource.
- Each CSI-IM resource is identified by a CSI-IM resource ID.
- CSI resource configuration related information can be expressed as CSI-ResourceConfig IE.
- CSI resource configuration related information defines a group including at least one of a non zero power (NZP) CSI-RS resource set, a CSI-IM resource set, and a CSI-SSB resource set. That is, the CSI resource configuration-related information includes a CSI-RS resource set list, and the CSI-RS resource set list includes at least one of an NZP CSI-RS resource set list, a CSI-IM resource set list, and a CSI-SSB resource set list. may contain one.
- a CSI-RS resource set is identified by a CSI-RS resource set ID, and one resource set includes at least one CSI-RS resource.
- Each CSI-RS resource is identified by a CSI-RS resource ID.
- parameters indicating the use of CSI-RS eg, 'repetition' parameter related to BM and 'trs-Info' parameter related to tracking.
- CSI report configuration-related information includes a report configuration type (reportConfigType) parameter representing time domain behavior and a reportQuantity parameter representing a CSI-related quantity for reporting.
- the time domain behavior may be periodic, aperiodic or semi-persistent.
- the UE measures CSI based on configuration information related to the CSI.
- the CSI measurement may include (1) a process of receiving a CSI-RS by a UE and (2) a process of calculating CSI through the received CSI-RS, which will be described in detail later.
- resource element (RE) mapping of CSI-RS resources is set in the time and frequency domains by higher layer parameter CSI-RS-ResourceMapping.
- the terminal reports the measured CSI to the base station.
- the terminal may omit the report.
- the terminal may report to the base station.
- the quantity is set to 'none', it is a case where an aperiodic TRS is triggered or repetition is set.
- the report of the terminal can be omitted only when repetition is set to 'ON'.
- the NR system supports more flexible and dynamic CSI measurement and reporting.
- the CSI measurement may include a procedure of receiving the CSI-RS and acquiring the CSI by computing the received CSI-RS.
- CM periodic/semi-persistent/periodic channel measurement
- IM interference measurement
- 4 port NZP CSI-RS RE pattern is used.
- the CSI-IM-based IMR of NR has a design similar to that of LTE's CSI-IM, and is set independently of ZP CSI-RS resources for PDSCH rate matching. And, in NZP CSI-RS based IMR, each port emulates an interference layer with (preferred channel and) precoded NZP CSI-RS. This is for intra-cell interference measurement for multi-user cases, and mainly targets MU interference.
- the base station transmits the precoded NZP CSI-RS to the terminal on each port of the configured NZP CSI-RS based IMR.
- the UE assumes a channel/interference layer for each port in the resource set and measures interference.
- a channel For a channel, if there is no PMI and RI feedback, multiple resources are set in a set, and the base station or network indicates a subset of NZP CSI-RS resources for channel / interference measurement through DCI.
- Each CSI resource setting 'CSI-ResourceConfig' includes configuration for S ⁇ 1 CSI resource set (given by higher layer parameter csi-RS-ResourceSetList).
- CSI resource setting corresponds to CSI-RS-resourcesetlist.
- S represents the number of configured CSI-RS resource sets.
- the configuration for the S ⁇ 1 CSI resource set is each CSI resource set including CSI-RS resources (consisting of NZP CSI-RS or CSI-IM) and the SS/PBCH block (SSB used for L1-RSRP computation) ) contains resources.
- Each CSI resource setting is located in a DL BWP (bandwidth part) identified by higher layer parameter bwp-id. And, all CSI resource settings linked to the CSI reporting setting have the same DL BWP.
- the time domain behavior of the CSI-RS resource within the CSI resource setting included in the CSI-ResourceConfig IE is indicated by the higher layer parameter resourceType and can be set to aperiodic, periodic or semi-persistent.
- the number of configured CSI-RS resource sets (S) is limited to '1'.
- the configured periodicity and slot offset are given in the numerology of the associated DL BWP, as given by bwp-id.
- the same time domain behavior is configured for the CSI-ResourceConfig.
- the same time domain behavior is configured for the CSI-ResourceConfig.
- CM channel measurement
- IM interference measurement
- channel measurement resource may be NZP CSI-RS for CSI acquisition
- interference measurement resource may be CSI-IM and NZP CSI-RS for IM.
- CSI-IM (or ZP CSI-RS for IM) is mainly used for inter-cell interference measurement.
- NZP CSI-RS for IM is mainly used for intra-cell interference measurement from multi-user.
- the UE may assume that CSI-RS resource(s) for channel measurement and CSI-IM / NZP CSI-RS resource(s) for interference measurement configured for one CSI reporting are 'QCL-TypeD' for each resource. .
- resource setting can mean resource set list.
- each trigger state set using the higher layer parameter CSI-AperiodicTriggerState, is associated with one or more CSI-ReportConfigs where each CSI-ReportConfig is linked to a periodic, semi-persistent or aperiodic resource setting.
- One reporting setting can be linked to up to three resource settings.
- the resource setting (given by the higher layer parameter resourcesForChannelMeasurement) is for channel measurement for L1-RSRP computation.
- the first resource setting (given by higher layer parameter resourcesForChannelMeasurement) is for channel measurement
- the second resource setting (given by csi-IM-ResourcesForInterference or nzp-CSI-RS -ResourcesForInterference)
- the setting is for interference measurement performed on CSI-IM or NZP CSI-RS.
- the first resource setting (given by resourcesForChannelMeasurement) is for channel measurement
- the second resource setting (given by csi-IM-ResourcesForInterference) is for CSI-IM based interference measurement
- the third resource setting (given by nzp-CSI-RS-ResourcesForInterference) is for NZP CSI-RS based interference measurement.
- each CSI-ReportConfig is linked to a periodic or semi-persistent resource setting.
- the resource setting is for channel measurement for L1-RSRP computation.
- the first resource setting (given by resourcesForChannelMeasurement) is for channel measurement
- the second resource setting (given by higher layer parameter csi-IM-ResourcesForInterference) is performed on CSI-IM It is used for interference measurement.
- each CSI-RS resource for channel measurement is associated with the CSI-IM resource by resource in the order of CSI-RS resources and CSI-IM resources in a corresponding resource set. .
- the number of CSI-RS resources for channel measurement is equal to the number of CSI-IM resources.
- the UE when interference measurement is performed in NZP CSI-RS, the UE does not expect to be set to one or more NZP CSI-RS resources in a related resource set within resource setting for channel measurement.
- a UE for which the higher layer parameter nzp-CSI-RS-ResourcesForInterference is set does not expect 18 or more NZP CSI-RS ports to be set in the NZP CSI-RS resource set.
- the UE assumes the following.
- Each NZP CSI-RS port configured for interference measurement corresponds to an interference transport layer.
- NZP CSI-RS resource for channel measurement NZP CSI-RS resource for interference measurement
- CSI-IM resource for interference measurement Another interference signal on the RE (s) of the NZP CSI-RS resource for channel measurement, NZP CSI-RS resource for interference measurement or CSI-IM resource for interference measurement.
- the time and frequency resources available to the UE are controlled by the base station.
- Channel state information includes channel quality indicator (CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), SS/PBCH block resource indicator (SSBRI), layer It may include at least one of indicator (LI), rank indicator (RI), or L1-RSRP.
- CQI channel quality indicator
- PMI precoding matrix indicator
- CRI CSI-RS resource indicator
- SSBRI SS/PBCH block resource indicator
- LI indicator
- RI rank indicator
- L1-RSRP L1-RSRP
- the UE N ⁇ 1 CSI-ReportConfig reporting setting M ⁇ 1 CSI-ReportConfig resource setting, and a list of one or two trigger states (aperiodicTriggerStateList and semiPersistentOnPUSCH -provided by TriggerStateList) is set by higher layers.
- Each trigger state in the aperiodicTriggerStateList includes an associated CSI-ReportConfigs list indicating channel and optionally resource set IDs for interference.
- each trigger state contains one associated CSI-ReportConfig.
- time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic.
- Periodic CSI reporting is performed on short PUCCH and long PUCCH.
- Periodicity and slot offset of Periodic CSI reporting can be set to RRC, refer to CSI-ReportConfig IE.
- SP sin-periodic CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH.
- SP CSI on PUSCH periodicity of SP CSI reporting is set to RRC, but slot offset is not set to RRC, and SP CSI reporting is activated/deactivated by DCI (format 0_1).
- DCI format 0_1
- SP-CSI C-RNTI SP-CSI C-RNTI
- the initial CSI reporting timing follows the PUSCH time domain allocation value indicated in DCI, and the subsequent CSI reporting timing follows the period set by RRC.
- DCI format 0_1 includes a CSI request field and can activate/deactivate a specific configured SP-CSI trigger state.
- SP CSI reporting has the same or similar activation/deactivation as the mechanism with data transmission on SPS PUSCH.
- aperiodic CSI reporting is performed on PUSCH and is triggered by DCI.
- information related to the trigger of aperiodic CSI reporting may be delivered/instructed/configured through MAC-CE.
- AP CSI-RS timing is set by RRC, and timing for AP CSI reporting is dynamically controlled by DCI.
- NR For NR, the method of dividing and reporting CSI in multiple reporting instances applied to PUCCH-based CSI reporting in LTE (eg, transmission in the order of RI, WB PMI / CQI, and SB PMI / CQI) is not applied. Instead, NR restricts setting a specific CSI report in short/long PUCCH, and CSI omission rule is defined. And, in relation to AP CSI reporting timing, PUSCH symbol/slot location is dynamically indicated by DCI. And, candidate slot offsets are set by RRC. For CSI reporting, slot offset (Y) is set for each reporting setting. For UL-SCH, slot offset K2 is set separately.
- Two CSI latency classes are defined in terms of CSI computation complexity.
- low latency CSI it is WB CSI including up to 4 ports Type-I codebook or up to 4-ports non-PMI feedback CSI.
- High latency CSI refers to CSI other than low latency CSI.
- Z, Z' is defined in units of OFDM symbols.
- Z represents the minimum CSI processing time from receiving the Aperiodic CSI triggering DCI to performing CSI reporting.
- Z' represents the minimum CSI processing time from receiving the CSI-RS for channel/interference to performing CSI reporting.
- the UE reports the number of CSIs that can be simultaneously calculated.
- node(s) and terminal(s) constituting a wireless communication network are becoming intelligent/advanced.
- various networks according to various environmental parameters (eg, distribution/location of base stations, distribution/location/material of buildings/furniture, location/moving direction/speed of terminals, climate information, etc.) /base station determination parameter values (eg, transmit/receive power of each base station, transmit power of each terminal, precoder/beam of base station/terminal, time/frequency resource allocation for each terminal, duplex method of each base station, etc. ) is expected to be quickly optimized and derived/applied.
- many standardization organizations eg, 3GPP, O-RAN
- 3GPP 3GPP, O-RAN
- AI Artificial Intelligence
- AI corresponds to any automation in which a machine can substitute for a job to be performed by a person.
- Machine learning refers to a technology in which a machine learns patterns for decision-making from data on its own without explicitly programming rules.
- Deep learning is an artificial neural network-based model, which can be performed by a machine at once from unstructured data to feature extraction and judgment.
- the algorithm relies on multi-layer networks of interconnected nodes for feature extraction and transformation inspired by biological neural systems, or neural networks.
- Common deep learning network architectures include deep neural networks (DNNs), recurrent neural networks (RNNs), and convolutional neural networks (CNNs).
- AI may be referred to as artificial intelligence based on deep learning in a narrow sense, but is not limited thereto in the present disclosure. That is, in the present disclosure, AI (or referred to as AI/ML) may collectively refer to automation technologies applied to intelligent machines (eg, UE, RAN, network node, etc.) capable of performing tasks like humans.
- intelligent machines eg, UE, RAN, network node, etc.
- AI (or AI/ML) can be classified according to various criteria as follows:
- Offline learning follows a sequential process of database collection, learning, and prediction. That is, collection and learning can be performed offline, and completed programs can be installed in the field and used for prediction work. In offline learning, the system does not learn incrementally, learning is performed using all available collected data and applied to the system without further learning. If learning on new data is required, learning may be started again using the entire new data.
- centralized learning when training data collected from a plurality of different nodes is reported to a centralized node, all data resources/storage/learning (e.g., supervised learning) (supervised learning, unsupervised learning, reinforcement learning, etc.) are performed on one centralized node.
- supervised learning supervised learning, unsupervised learning, reinforcement learning, etc.
- Federated learning is built on data where collective models exist across disparate data owners. Instead of ingesting data into models, AI/ML models are imported as data sources, allowing local nodes/individual devices to collect data and train their own copy of the model, eliminating the need to report the source data to a central node. In federated learning, parameters/weights of an AI/ML model can be sent back to a centralized node to support general model training. Federated learning has advantages in terms of increased computational speed and information security. That is, the process of uploading personal data to the central server is unnecessary, and leakage and abuse of personal information can be prevented.
- Distributed learning refers to the concept that the machine learning process is scaled and distributed across a cluster of nodes. Training models are split and shared across multiple nodes working concurrently to speed up model training.
- Supervised learning is a machine learning task that aims to learn mapping features from inputs to outputs given a labeled data set.
- the input data is called training data and has known labels or outcomes.
- Examples of supervised learning include:
- KNN k-Nearest Neighbor
- SVM Support Vector Machines
- Supervised learning can be further grouped into regression and classification problems, where classification is predicting labels and regression is predicting quantities.
- Unsupervised learning is a machine learning task that aims to learn features that describe hidden structures in unlabeled data. Input data is unlabeled and has no known consequences.
- Some examples of unsupervised learning include K-means clustering, principal component analysis (PCA), nonlinear independent component analysis (ICA), and long-short-term memory (LSTM). .
- RL reinforcement learning
- An agent aims to optimize a long-term goal by interacting with the environment based on a trial-and-error process, which is goal-oriented learning based on interaction with the environment.
- An example of the RL algorithm is as follows.
- SARSA State-Action-Reward-State-Action
- reinforcement learning can be grouped into model-based reinforcement learning and model-free reinforcement learning as follows.
- Model-based reinforcement learning Refers to a RL algorithm that uses a predictive model. The transition probabilities between the states are obtained using a model of the various dynamic states of the environment and these states leading to rewards.
- Model-free reinforcement learning refers to RL algorithms based on values or policies that achieve maximum future rewards. Multi-agent environments/states are less computationally complex and do not require an exact representation of the environment.
- RL algorithms can also be classified into value-based RL versus policy-based RL, policy-based RL versus non-policy RL, and the like.
- FIG. 11 illustrates a Feed-Forward Neural Network.
- a feed-forward neural network is composed of an input layer, a hidden layer, and an output layer.
- FFNN In FFNN, information is transmitted only from the input layer to the output layer, and passes through the hidden layer if there is one.
- a recurrent neural network is a type of artificial neural network in which hidden nodes are connected with directed edges to form a directed cycle. It is a model suitable for processing data that appears sequentially, such as voice and text.
- A denotes a neural network
- x t denotes an input value
- h t denotes an output value.
- h t may mean a state value indicating a current state based on time
- h t-1 may indicate a previous state value.
- LSTM Long Short-Term Memory
- RNN Random-Term Memory
- FIG. 13 illustrates a convolutional neural network
- a convolutional neural network (CNN) is used for two purposes: reducing model complexity and extracting good features by applying a convolution operation commonly used in the field of image processing or image processing.
- Kernel or filter Means a unit/structure that applies weights to inputs in a specific range/unit.
- the kernel (or filter) can be changed by learning.
- Feature map It means the result of applying the kernel to the input.
- Several feature maps can be extracted to induce robustness to distortion, change, etc.
- - Pooling Refers to an operation (for example, max pooling, average pooling) to reduce the size of a feature map by downsampling the feature map.
- Auto encoder receives a feature vector x(x 1 , x 2 , x 3 , ...), and the same or similar vector x'(x' 1 , x' 2 , x' 3 , ... ) means a neural network that outputs ' .
- Auto encoder has the same characteristics of input node and output node. Since auto encoder reconstructs the input, the output can be referred to as reconstruction. Also, auto encoder is a kind of unsupervised learning.
- the loss function of the auto encoder illustrated in FIG. 14 is calculated based on the difference between the input and the output, and based on this, the degree of loss of the input is determined and the auto encoder performs an optimization process to minimize the loss. do.
- Data collection Data collected from network nodes, management entities or UEs as a basis for AI model training, data analysis and inference
- AI Model A data driven algorithm applying AI technology that generates a set of outputs including predictive information and/or decision parameters based on a set of inputs.
- a data collection function 10 collects input data and processes input data to a model training function 20 and a model inference function 30. It is a function that provides data.
- Examples of input data may include measurements from UEs or other network entities, actor feedback, and AI model output.
- the data collection function 10 performs data preparation based on input data and provides processed input data through data preparation.
- the data collection function 10 does not perform specific data preparation (eg, data pre-processing and cleaning, forming and transformation) for each AI algorithm, , data preparation common to AI algorithms can be performed.
- the Model Training function (10) provides training data (11) to the Model Training function (20), and inference data (12) to the Model Inference function (30).
- Training Data) (11) is data required as an input for the AI Model Training function (20).
- Inference Data (12) is data required as an input for the AI Model Inference function (30).
- the data collection function 10 may be performed by a single entity (eg, UE, RAN node, network node, etc.) or may be performed by a plurality of entities.
- Training Data (11) and Inference Data (12) from a plurality of entities may be provided to the Model Training function (20) and the Model Inference function (30), respectively.
- the Model Training function 20 is a function that performs AI model training, validation, and testing that can generate model performance metrics as part of an AI model testing procedure.
- the Model Training function (20) is also responsible for data preparation (eg, data pre-processing and cleaning, forming and transformation) based on the Training Data (11) provided by the Data Collection function (10), if necessary.
- Model Deployment/Update (13) is used to initially deploy the trained, verified, and tested AI model to the Model Inference function (30) or to provide an updated model to the Model Inference function (30). do.
- the Model Inference function 30 is a function that provides an AI model inference output 16 (eg, prediction or decision).
- the Model Inference function 30 may provide Model Performance Feedback 14 to the Model Training function 20, if applicable.
- the Model Inference function (30) is also responsible for data preparation (eg, data pre-processing and cleaning, forming and transformation) based on the Inference Data (12) provided by the Data Collection function (10), if necessary.
- the output (Output) 16 refers to the inference output of the AI model generated by the Model Inference function 30, and detailed information of the inference output may vary depending on the use case.
- Model Performance Feedback (14) can be used to monitor the performance of the AI model, if available, and this feedback can also be omitted.
- the Actor function 40 is a function that receives an output 16 from the Model Inference function 30 and triggers or performs a corresponding task/action.
- the actor function 40 may trigger actions/actions for other entities (eg, one or more UEs, one or more RAN nodes, one or more network nodes, etc.) or itself.
- Feedback (15) can be used to derive training data (11), inference data (12), or to monitor the performance of the AI model and its effect on the network.
- the definition of training/validation/test in a data set used in AI/ML can be classified as follows.
- - Validation data Data set for verifying a model that has already been trained. That is, it usually means a data set used to prevent over-fitting of the training data set.
- Test data Data set for final evaluation. This data is data irrelevant to learning.
- the training data and validation data can be divided and used in a ratio of 8:2 or 7:3 within the entire training set, and if the test is included, 6:2:2 ( training: validation: test) can be divided and used.
- the cooperation level can be defined as follows, and modification due to the combination of a plurality of levels below or separation of any one level is possible.
- Cat 1 Entails inter-node support to improve each node's AI/ML algorithm. This applies when the UE receives assistance from the gNB (for training, adaptation, etc.) and vice versa. No exchange of models between network nodes is required at this level.
- a RAN node eg, a base station, a TRP, a central unit (CU) of a base station, etc.
- a network node eg, an operation administration maintenance (OAM) of a network operator, or a UE.
- OAM operation administration maintenance
- the function illustrated in FIG. 15 may be implemented in cooperation with two or more entities among a RAN, a network node, an OAM of a network operator, or a UE.
- one entity may perform some of the functions of FIG. 15 and another entity may perform the remaining functions.
- transmission / provision of data / information between each function is omitted. It can be.
- the Model Training function 20 and the Model Inference function 30 are performed by the same entity, the delivery/provision of the Model Deployment/Update 13 and the Model Performance Feedback 14 may be omitted.
- any one of the functions illustrated in FIG. 15 may be performed in collaboration with two or more entities among a RAN, a network node, an OAM of a network operator, or a UE. This may be referred to as a split AI operation.
- 16 is a diagram illustrating segmented AI inference.
- Model Inference function among split AI operations, is cooperatively performed by an end device such as a UE and a network AI/ML endpoint.
- each of the Model Training function, Actor, and Data Collection function is split into multiple parts according to the current task and environment, and can be performed by cooperation of multiple entities.
- a computation-intensive and energy-intensive part may be performed at a network endpoint, while a privacy-sensitive part and a delay-sensitive part may be performed at an end device.
- the end device may execute a job/model from the input data to a specific part/layer and then transmit intermediated data to the network endpoint.
- a network endpoint executes the remaining parts/layers and provides inference outputs to one or more devices performing the action/task.
- FIG. 17 illustrates the application of a functional framework in a wireless communication system.
- the AI Model Training function is performed by a network node (eg, a core network node, an OAM of a network operator, etc.), and an AI Model Inference function is performed by a RAN node (eg, a base station, a TRP, a CU of a base station, etc.) ) exemplifies the case performed by a network node (eg, a core network node, an OAM of a network operator, etc.), and an AI Model Inference function is performed by a RAN node (eg, a base station, a TRP, a CU of a base station, etc.) ) exemplifies the case performed by a network node (eg, a core network node, an OAM of a network operator, etc.), and an AI Model Inference function is performed by a RAN node (eg, a base station, a TRP, a CU of a base station, etc.) ) exemplifies the case performed by
- Step 1 RAN node 1 and RAN node 2 transmit input data (ie, training data) for AI Model Training to the network node.
- RAN node 1 and RAN node 2 transmit data collected from the UE (eg, measurement of the UE related to RSRP, RSRQ, SINR of the serving cell and the neighboring cell, location of the UE, speed, etc.) together to the network node.
- data collected from the UE eg, measurement of the UE related to RSRP, RSRQ, SINR of the serving cell and the neighboring cell, location of the UE, speed, etc.
- Step 2 The network node trains the AI Model using the received training data.
- Step 3 The network node distributes/updates the AI Model to RAN node 1 and/or RAN node 2.
- RAN node 1 (and/or RAN node 2) may continue to perform model training based on the received AI Model.
- Step 4 RAN node 1 receives input data (ie, inference data) for AI Model Inference from the UE and RAN node 2.
- input data ie, inference data
- Step 5 RAN node 1 performs AI Model Inference using the received inference data to generate output data (eg, prediction or decision).
- Step 6 If applicable, RAN node 1 may send model performance feedback to the network node.
- Step 7 RAN node 1, RAN node 2, and UE (or 'RAN node 1 and UE', or 'RAN node 1 and RAN node 2') perform an action based on the output data. For example, in the case of a load balancing operation, the UE may move from RAN node 1 to RAN node 2.
- Step 8 RAN node 1 and RAN node 2 transmit feedback information to the network node.
- RAN node eg, a base station, a TRP, a CU of a base station, etc.
- Step 1 The UE and RAN node 2 transmit input data (ie, training data) for AI Model Training to RAN node 1.
- input data ie, training data
- Step 2 RAN node 1 trains the AI model using the received training data.
- Step 3 RAN node 1 receives input data (ie, inference data) for AI Model Inference from the UE and RAN node 2.
- input data ie, inference data
- Step 4 RAN node 1 performs AI Model Inference using the received inference data to generate output data (eg, prediction or decision).
- Step 5 RAN node 1, RAN node 2, and UE (or 'RAN node 1 and UE', or 'RAN node 1 and RAN node 2') perform an action based on the output data. For example, in the case of a load balancing operation, the UE may move from RAN node 1 to RAN node 2.
- Step 6 RAN node 2 sends feedback information to RAN node 1.
- FIG. 19 illustrates a case in which the AI Model Training function is performed by a RAN node (eg, a base station, a TRP, a CU of a base station, etc.) and an AI Model Inference function is performed by a UE.
- a RAN node eg, a base station, a TRP, a CU of a base station, etc.
- an AI Model Inference function is performed by a UE.
- Step 1 The UE transmits input data (ie, training data) for AI Model Training to the RAN node.
- the RAN node may collect data from various UEs and/or from other RAN nodes (e.g., RSRP, RSRQ, measurement of the UE related to the serving cell and neighboring cell, SINR, UE location, speed, etc.) there is.
- Step 2 The RAN node trains the AI Model using the received training data.
- Step 3 The RAN node distributes/updates the AI Model to the UE.
- the UE may continue to perform model training based on the received AI Model.
- Step 4 Receives input data (ie, inference data) for AI Model Inference from the UE and the RAN node (and/or from other UEs).
- Step 5 The UE generates output data (eg, prediction or decision) by performing AI Model Inference using the received inference data.
- output data eg, prediction or decision
- Step 6 If applicable, the UE may send model performance feedback to the RAN node.
- Step 7 The UE and the RAN node perform an action based on the output data.
- Step 8 The UE sends feedback information to the RAN node.
- nodes and terminals constituting a wireless communication network are becoming intelligent/advanced.
- Network/base station decision parameter values can be quickly optimized and derived/applied. For example, transmission/reception power of each base station, transmission power of each terminal, precoder/beam of base station/terminal, time/frequency resource allocation for each terminal, A duplex scheme of each base station can be quickly optimized.
- the network can quickly control/adjust interference for each terminal according to environmental parameters that change in real time.
- the network may receive more sophisticated (and/or concise) CSI measurement and result reports from the terminal, or other RS (eg base station) : SRS, etc.) may predict channel information between the base station and the terminal.
- RS eg base station
- SRS SRS
- channel estimation and precoder/beam determination methods of a base station can be largely divided into open loop methods and closed loop methods.
- the base station does not acquire channel information from the terminal, and the base station transparently uses a diversity scheme such as CDD (cyclic delay diversity) series or precoder cycling to the terminal.
- CDD cyclic delay diversity
- the terminal measures the channel based on CSI-RS, etc., reports the measured result to the base station, and typically, an explicit feedback reporting method and an implicit feedback method feedback) reporting method is considered.
- the explicit feedback reporting method means that the terminal feeds back the channel matrix itself
- the implicit feedback reporting method refers to channel characteristics such as CQI (channel quality indicator), PMI (precoding matrix indicator), RI It is a method of expressing/calculating with (rank indicator) and reporting to the base station.
- type I CSI feedback related to single user (SU)-MIMO and type II CSI feedback related to multi user (MU)-MIMO are supported.
- the type I CSI feedback is based on a codebook based on DFT vector selection considering the spatial domain, and the payload and / or overhead associated with it may be small.
- type II CSI feedback is based on a codebook capable of performing more sophisticated channel reporting by linear combining DFT vectors in the spatial domain, and the payload and/or overhead associated with this can be very large.
- the payload in order to reduce the payload for the above-described type II CSI feedback, a feedback method considering not only the spatial domain but also the frequency domain has been introduced. Specifically, in performing channel reporting for each unit (eg subband) in the frequency domain, the payload can be reduced by reflecting the correlation characteristics of channels in the frequency domain as a DFT vector in the frequency domain and reporting the channel.
- the input for the AI exemplified below may correspond to the Training Data and / or Inference Data, and the output for the AI may correspond to the output of Model Inference.
- -Input for AI Location/distribution of terminals in the network/base station, requested traffic, information related to location movement (e.g., terminals moving along a certain route such as trains, location change) Fixed type terminal with little probability), uplink reception channel/RS (eg PUCCH, PUSCH, SRS, UL-DMRS, etc.)
- location movement e.g., terminals moving along a certain route such as trains, location change
- Fixed type terminal with little probability Uplink reception channel/RS (eg PUCCH, PUSCH, SRS, UL-DMRS, etc.)
- the network/base station allocates short-term/mid-term time/frequency/space resources to the terminals based on the prediction value and capability information of each terminal (e.g., whether or not the interference cancellation reception function is possessed), An interference control/adjustment method, and/or a precoder/beamformer may be determined.
- - Input for AI network/base station: Location/distribution of terminals in the network/base station, requested traffic, information related to location movement (e.g., terminals moving along a certain route such as trains, locations with little probability of change) fixed terminal, etc.), feedback information received from the terminal
- -Input for AI terminal: channel information estimated by the terminal in the past, channel information estimated from the RS transmitted by the base station (eg SSB, CSI-RS, DM-RS, PT-RS, TRS, etc.) and the base station Transmission information of the transmitted base station (e.g., number of antenna/panel ports, power information, QCL, etc.)
- the network/base station may predict current and/or future channel information of the terminal based on the predicted value, information on capability values of each terminal (eg, whether or not an interference cancellation reception function is possessed), and information reported from the terminal.
- the network/base station uses the predicted channel information to determine a short/mid-term time/frequency/space resource allocation scheme, an interference control/steering scheme, and/or a precoder/beamformer. can decide
- a base station and a terminal may configure input and output based on an auto encoder.
- the autoencoder is a neural network that receives a feature vector x and outputs the same or similar vector x'.
- An auto-encoder has meaning when the number of hidden nodes (h) is smaller than the number of input layers, and can be used for image compression, classification, and regression.
- SAE separse auto encoder
- DAE Dense auto encoder
- CAE Contractive auto encoder
- DAE is a method of finding an original pattern without noise after adding noise
- CAE uses a method of making the derivative of an encoder function small.
- the present disclosure when AI/ML as described above is introduced into a wireless communication system, methods for effective operation of a terminal and/or a base station are described. Specifically, the present disclosure proposes methods for performing efficient channel state information reporting (CSI reporting) according to AI/ML-based settings/instructions.
- CSI reporting channel state information reporting
- 20 is a diagram illustrating a signaling procedure between a base station and a terminal for a method for reporting channel state information according to an embodiment of the present disclosure.
- FIG. 20 is for convenience of description and does not limit the scope of the present disclosure. Some step(s) illustrated in FIG. 20 may be omitted depending on circumstances and/or settings.
- the base station and the terminal in FIG. 20 are just one example, and may be implemented as a device illustrated in FIG. 23 below.
- the processor 102/202 of FIG. 23 may control transmission and reception of channels/signals/data/information using the transceiver 106/206, and may transmit or receive channels/signals/information. It can also be controlled to store data/information or the like in the memory 104/204.
- a base station may mean a generic term for an object that transmits/receives data with a terminal.
- the base station may be a concept including one or more transmission points (TPs), one or more transmission and reception points (TRPs), and the like.
- the TP and/or the TRP may include a panel of a base station, a transmission and reception unit, and the like.
- TRP refers to a panel, an antenna array, a cell (eg, macro cell / small cell / pico cell, etc.), It may be replaced with expressions such as TP (transmission point), base station (base station, gNB, etc.) and applied.
- a base station may be interpreted as one TRP.
- the base station may include a plurality of TRPs, or may be one cell including a plurality of TRPs.
- step S2010 the base station may perform an AI model operation before providing CSI reporting-related setting information to the terminal (or before providing CSI reporting-related control information differently from the drawing).
- the operation of step S2010 is performed by a network node other than the base station, and the base station may receive the performed result.
- a base station or network node may generate an output using an AI model from one or more inputs (ie, inference data) by performing a model inference function among the AI functions illustrated in FIG. 15 above.
- a base station or network node may perform multiple functions including a model inference function.
- the base station or network node may generate an output from one or more inputs based on the auto encoder illustrated in FIG. 14 above.
- a base station or a network node may provide location/distribution of terminals, requested traffic, information related to location movement (e.g., a terminal moving along a certain route such as a train, a stationary terminal with little probability of location change) etc.), uplink reception channel/RS (e.g. PUCCH, PUSCH, SRS, UL-DMRS, etc.), and feedback information from the terminal are received as input values, and based on this, the output value (terminals Short/mid-term time/frequency/space resource allocation scheme, interference control/steering scheme, and/or precoder/beamformer, etc.)
- RS e.g. PUCCH, PUSCH, SRS, UL-DMRS, etc.
- an output value output by a base station or a network node or information derived (or processed) from an output value may correspond to setting information and/or control information described later. That is, the base station and the network node may derive an output value suitable for the situation through learning based on information about the changing environment and provide it to the terminal as setting information and/or control information.
- one or more procedures illustrated in FIG. 17 or 18 may be performed together prior to step S2010.
- the terminal derives the output value by performing the Model Inference function, one or more procedures illustrated in FIG. 19 may be performed together prior to step S2010.
- the base station may transmit configuration information related to CSI reporting to the terminal.
- the configuration information includes the aforementioned CSI-related operation, CSI-related resource setting (eg, resource setting, resource setting setting, CSI-RS resource setting, etc.), CSI report (eg, CSI reportQuantity, etc.) and/or CSI omission, etc. It may contain setting information for
- the configuration information includes configuration information for an uplink channel associated with CSI reporting (eg, PUSCH/PUCCH format information, payload information, etc.), a report target related to CSI reporting (eg, PMI, RI, CQI , CRI, etc.), information on a resource region to perform CSI measurement (eg, CSI measurement band (band (/ subband), etc.), reference signal information related to CSI calculation, etc.).
- CSI reporting eg, PUSCH/PUCCH format information, payload information, etc.
- a report target related to CSI reporting eg, PMI, RI, CQI , CRI, etc.
- information on a resource region to perform CSI measurement eg, CSI measurement band (band (/ subband), etc.
- reference signal information related to CSI calculation e.g, etc.
- the above configuration information may be transmitted and received through higher layer signaling (eg, RRC signaling, etc.).
- higher layer signaling eg, RRC signaling, etc.
- the base station may transmit control information related to CSI reporting to the terminal.
- the control information related to CSI reporting may be control information based on the setting information in step S2020.
- the corresponding control information may include control/instruction information for the aforementioned CSI-related operation, CSI-related resource configuration, CSI reporting, and/or CSI omission.
- control information may include payload indication information for at least one of PUCCH and PPUSCH carrying CSI reporting.
- the payload indication information may be configured in association with the format of the corresponding PUCCH.
- control information may include information indicating a rank value at any one of the CSI reporting time and data scheduling time point.
- the CSI reporting may be performed based on the rank value there is.
- the control information in step S2020 includes information on a plurality of reporting subjects (eg, PMI, CQI, RI, etc.) related to CSI reporting
- the control information is at least one reporting subject among the plurality of reporting subjects may include information indicating
- the corresponding CSI report may be determined/calculated based on the at least one report subject.
- the corresponding CSI report may include a differential value for the remaining reporting objects except for the at least one reporting object.
- the control information may include information indicating at least one specific frequency domain resource among the one or more frequency domain resources.
- the at least one specific frequency domain resource may be associated with frequency domain resource allocation according to data scheduling following the corresponding CSI report. That is, the corresponding CSI reporting may be set to be performed based on information predicting resource allocation in subsequent data scheduling.
- control information may include an adjustment value for the at least one parameter.
- control information may be transmitted and received through dynamic signaling (eg, MAC-CE, DCI, etc.).
- dynamic signaling eg, MAC-CE, DCI, etc.
- the terminal may perform an AI model operation before reporting CSI to the base station (or before receiving configuration information/control information related to CSI reporting differently from the drawing).
- the terminal may generate an output using an AI model from one or more inputs (ie, inference data) by performing a model inference function among the AI functions previously illustrated in FIG. 15 .
- the terminal may perform multiple functions including a model inference function.
- the base station or network node may generate an output from one or more inputs based on the auto encoder illustrated in FIG. 14 above.
- the terminal transmits channel information estimated from the channel information estimated by the terminal in the past, RS received from the base station (eg, SSB, CSI-RS, DM-RS, PT-RS, TRS, etc.) and transmission received from the base station Information (e.g., the number of antenna/panel ports, power information, QCL, etc.) is set as an input value, and based on this, an AI model is used to set the output value (e.g., (simplified) current and/or future channel estimation information, etc.) ) can be created.
- RS received from the base station eg, SSB, CSI-RS, DM-RS, PT-RS, TRS, etc.
- the base station Information e.g., the number of antenna/panel ports, power information, QCL, etc.
- an AI model is used to set the output value (e.g., (simplified) current and/or future channel estimation information, etc.) ) can be created.
- the output value output by the terminal or information derived (or processed) from the output value may correspond to information for CSI calculation and/or CSI reporting described later. That is, the base station and the network node may derive an output value suitable for the situation through learning based on information about the changing environment and report it to the base station in the form of CSI.
- one or more procedures illustrated in FIG. 17 or 18 may be performed together prior to step S2040.
- the base station derives the output value by performing the Model Inference function, one or more procedures illustrated in FIG. 19 may be performed together prior to step S2040.
- the terminal may perform CSI reporting to the base station. That is, the terminal may transmit the CSI calculated based on the above-described configuration information and/or control information to the base station.
- the CSI reporting in step S2050 may be based on information about a channel state at the time of the data scheduling, based on the fact that data scheduling by the base station will be performed after the corresponding CSI reporting.
- the CSI report in step S2050 may be based on prediction information about the channel state at the time of data scheduling (step S2060) by the base station after the corresponding CSI report.
- the corresponding CSI report is further based on information on the transmission scheme (eg, precoding scheme, resource allocation information, etc.) at the time of data scheduling by the base station after the corresponding CSI report (step S2060).
- the transmission scheme eg, precoding scheme, resource allocation information, etc.
- the information at the time of data scheduling by the base station after reporting the corresponding CSI is an output calculated based on one or more inputs by using an AI model by the base station and / or terminal can be a value
- This embodiment relates to a method of performing CSI reporting based on prediction information at a data scheduling time point after the corresponding CSI reporting in performing a CSI reporting procedure between a base station and a terminal.
- the base station predicts channel information at the time of data scheduling of the terminal and/or transmits the data scheduling method (eg SU/MU-MIMO). , diversity scheme, beamformer/precoder determination, etc.), CSI reporting may be supported.
- the data scheduling method eg SU/MU-MIMO.
- This embodiment may include some or all of the following examples.
- a base station sets / instructs a parameter and / or parameter set related to a payload of CSI to be reported by a terminal It's about the room.
- the base station may indicate a PUCCH carrying CSI reported by the terminal and/or an indicator indicating a payload of the PUSCH.
- the base station may determine a container size for the PUCCH and/or PUSCH associated with the corresponding indicator, and set/instruct the terminal for the determined container size.
- the container size may correspond to the payload size.
- the terminal may calculate the optimal CSI suitable for the set/instructed payload and report the CSI to the base station through PUCCH and/or PUSCH.
- the corresponding indicator may be set/instructed through a format indicator in association with a specific PUCCH format and/or PUSCH format.
- the base station can set a UCI payload (ie, CSI payload) optimized for CSI reporting of the terminal, and the terminal performs additional operations such as CSI omission or CSI drop. It has the advantage of being able to perform CSI reporting without
- the base station explicitly or implicitly transmits rank information at the time of scheduling data and / or reporting CSI for the terminal You can instruct the terminal with For example, corresponding rank information may be dynamically indicated based on dynamic signaling (eg, MAC-CE, DCI, etc.).
- dynamic signaling eg, MAC-CE, DCI, etc.
- the terminal can omit the calculation of the rank when calculating the CSI, and through this, there is an effect of reducing the complexity of CSI reporting.
- CSI reporting may be performed using a 1 part encoding method instead of a 2 parts encoding method.
- the terminal may report some or all of CQI, PMI, LI, and CRI to the base station.
- the CSI reporting target (eg, CSI reporting-quantity), which is set semi-static through higher layer signaling (eg, RRC signaling), is better than when using an AI Model. It can be operated flexibly.
- the base station may set/instruct a CSI reporting target in a dynamic manner in order to efficiently operate the CSI reporting target.
- a new CSI reporting target setting (e.g., dynamic reporting-config) that can be (dynamically) changed differently from the existing method is newly defined, and the base station dynamically sets the parameter (s) in the information element (IE) in the setting. It can be set to set/instruct/change/update by signaling (eg MAC-CE, DCI, etc.).
- a method of using a linkage between a previous CSI reporting object (hereinafter referred to as quantity A) and a subsequent CSI reporting object (hereinafter referred to as quantity B) may be considered.
- the base station predicts that there is little change in PMI through AI Model, etc., for the same CSI report configuration (eg, the same CSI reportConfig ID)
- the UE may assume the PMI of quantity A as it is and calculate/report RI/CQI or CQI only of quantity B.
- the terminal may report a differential value for the corresponding PMI in quantity B.
- the quantity B reported by the UE may be RI/differential PMI/CQI.
- the terminal performs prediction based on the AI Model to provide information on whether to maintain a specific CSI parameter until a specific CSI parameter is maintained and/or a subsequent CSI reporting instance (CSI reporting instance). It can also be set to report along with CSI.
- the UE may perform CSI reporting by omitting the corresponding CSI parameter at the subsequent CSI reporting time.
- the corresponding CSI parameter may be Part 1 CSI or part of PMI (eg, W1 only or WB CSI (PMI)) (included in Part 2 CSI).
- the payload designation (related) parameter may be limited to and applied to a specific CSI (eg, PMI).
- the CSI included in the payload includes AI / ML related coefficients to be updated for AL Model operation of the terminal and / or the base station in addition to implicit CSI such as existing CQI, PMI, RI, LI, and CRI )(s) and/or AI/ML related parameter value(s) may be included.
- the base station based on the information predicted through the AI model, sets a frequency resource region (eg, band, subband, etc.) to be measured and / or reported by the terminal /It's about how to instruct.
- a frequency resource region eg, band, subband, etc.
- a subband (or band) to be reported by a UE is semi-statically configured by a base station through higher layer signaling (eg, RRC signaling). (reporting setting).
- the subband to be reported by the terminal and the subband to which the terminal receives data scheduling from the base station may be different.
- the subband for data scheduling of the UE may vary according to a transmission method (eg, a precoder method, SU/MU, etc.) supported by the eNB.
- the base station may dynamically set/instruct the terminal of information on the frequency resource region (ie, reporting subband or reporting band) to be reported by the terminal, and through this, the CSI reporting payload may be reduced.
- the frequency resource region ie, reporting subband or reporting band
- the PDSCH on which data is actually scheduled is also the same as the frequency domain set by the reporting subband (or reporting band) set by the base station, or scheduling for the PDSCH can be set within the corresponding frequency domain.
- the terminal may be configured not to expect that the PDSCH is scheduled outside the corresponding frequency domain.
- reporting is turned on based on a bitmap of reporting subbands (or reporting bands) set by higher layer signaling (eg, RRC signaling).
- RRC signaling e.g. RRC signaling
- a method in which the terminal reports information in a bitmap form as much as the number of bits (reporting on) through MAC-CE or DCI may be considered.
- a reporting on bit may mean a bit in which a subband in reportFreqConfiguration of RRC signaling is set to 1.
- a method in which a specific bitmap pattern(s) is defined and the base station instructs the terminal of the corresponding pattern may be considered.
- a scheme in which the base station indicates only the best/preferred number of subbands and the terminal measures and reports CSI corresponding to the number of subbands may also be considered.
- reporting on all subbands ie, Full CSI reporting method
- the proposed dynamically setting/instructing specific subband(s) are reported. It is possible to operate by setting so that setting information (eg, CSI-RS resource set, CSI reportConfig, report set, etc.) associated with a method of performing (dynamic subband reporting method) is distinguished.
- setting information eg, CSI-RS resource set, CSI reportConfig, report set, etc.
- Embodiment 1-3 relates to a scheme in which a base station configures/instructs information about a CSI reporting, estimation, and/or prediction time point of a terminal to a terminal.
- the base station may set/instruct the terminal whether the CSI information to be reported by the terminal is based on the data scheduling time point or the CSI reporting time point determined by CSI-RS triggering.
- the base station sets/designates a specific time window, and the base station transmits information about the CSI determined/calculated by the terminal through filtering (eg, average) within the set/designated time window. It is also possible to set/instruct the terminal to report. In this case, a start point (ie, a measurement start point) for the corresponding time window may be set/instructed, and a time duration or end point may be set/instructed.
- a start point ie, a measurement start point
- a time duration or end point may be set/instructed.
- Embodiments 1-4 relate to a method of dynamically setting/instructing parameter(s) related to a reference resource for accurate CSI calculation/prediction based on an AI Model.
- a reference resource is defined for CSI calculation of a terminal, and information to be assumed when calculating CSI from the reference resource may be as shown in Table 6 below.
- 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 configured as for the PDSCH reception - The bandwidth as configured for the corresponding CQI report.
- the reference resource uses the CP length and subcarrier spacing configured for PDSCH reception - No resource elements used by primary or secondary synchronization signals or PBCH. - Redundancy Version 0.
- the ratio of PDSCH EPRE to CSI-RS EPRE Assume no REs allocated for NZP CSI-RS and ZP CSI-RS.
- the base station may set/reconfigure the number of symbols of a control channel and/or the number of DM-RSs to be assumed at the time of data scheduling of the terminal through MAC-CE or DCI, and the terminal may Assuming the set/reset value, CSI can be calculated and reported.
- the specific parameter may include BWP identity (ID), CSI-RS ID, CSI report ID, panel ID, and the like.
- This embodiment relates to a signaling method for efficiently performing CSI omission for the corresponding CSI in performing a CSI reporting procedure between a base station and a terminal.
- This embodiment may include some or all of the following examples.
- Embodiment 2-1 relates to a scheme in which a base station indicates a CSI omission rate to be applied to CSI omission in a terminal.
- the base station may indicate information on a CSI omission rate that the UE should apply to CSI omission, and the UE calculates and applies CSI to satisfy the indicated CSI omission rate and reports the CSI information to the eNB.
- the above-described CSI omission rate may be defined as ⁇ number of actual feedback bits/number of bits required for full CSI reporting according to set information ⁇ .
- the corresponding CSI omission rate may be set/defined to be applied only to PMI.
- the above-described CSI omission rate may be used as a substitute for information on how much CSI should be compressed (ie, CSI compression rate).
- the above-described CSI omission/compression ratio may be set/defined as an input-to-output ratio of an encoder or a length of an output vector when using an auto encoder related to an AI Model. In this case, it may be assumed that the encoder is the terminal side.
- the aforementioned CSI omission/compression ratio may be set/instructed for each rank or rank group. This is because the required payload is different for each rank (or rank group) reported by the UE.
- the aforementioned CSI omission/compression ratio may be set/instructed/applied for each layer or layer group.
- the terminal may set and report priorities for each layer or layer group, or the base station may set priorities for each layer or layer group to the terminal. For example, a layer with a high priority may be set to have a low CSI skip/compression ratio. Based on the corresponding priority, the terminal can report more accurate channel information to the base station.
- Embodiment 2-2 relates to a method for reporting a CSI omission rate applied to CSI omission by a UE by including it in a CSI report.
- the terminal calculates/omits/compresses CSI to be suitable for the feedback resource (eg, PUSCH, PUCCH) set by the base station, and reports information on the corresponding CSI omission/compression ratio to the base station together with the CSI.
- the corresponding information may be included in Part 1 CSI and reported, which is to remove ambiguity about the payload of Part 2 CSI.
- the granularity of the CSI omission/compression ratio may be information set by the base station, promised or defined in advance, or additionally reported by the terminal.
- the above-described CSI omission/compression ratio may be set/defined as an input-to-output ratio of an encoder or a length of an output vector when using an auto encoder related to an AI Model. In this case, it may be assumed that the encoder is the terminal side.
- the terminal calculates and / or compresses to be suitable for the feedback resource (eg, PUSCH, PUCCH, etc.) set by the base station, and performs optimal codebook parameterization.
- the calculation and/or compression may be based on the AI Model described above.
- the codebook parameter of the type II codebook may be set/determined by higher layer signaling (eg, RRC signaling) or may be information fixed according to standards.
- the codebook parameters include the number of SD basis information, FD basis information and/or time domain (TD) basis information (eg, 1D/2D DFT vector), oversampling factor, type of basis information, amplitude/ It may include the granularity of combining coefficients of the phase, the maximum number of combining coefficients, and the like.
- Corresponding codebook parameters may be set to layer common. However, in some cases, some or all of the corresponding codebook parameters may be layer (or rank) specific.
- the terminal derives the optimal size (eg, bitwidth) and / or parameter value for the above-described codebook parameter based on the AI Model (of the terminal), and reports / feeds the derived information to the base station.
- the optimal size eg, bitwidth
- the codebook parameters eg, bitwidth, number of coefficients, granularity size, etc.
- the terminal 1) reports RI and / or CQI (first), 2) reports parameterization information for PMI, and 3) reports PMI, LI and / or CQI (second).
- the terminal 1) reports RI and / or CQI (first), 2) reports parameterization information for LI and / or CQI (second) and / or PMI, and 3) reports PMI It can be configured to perform 3-step CSI reporting.
- the parameterization information for the PMI in the second step may include information about the size of some or all of the codebook parameters in the above example (eg, bitwidth, number of coefficients, granularity size, etc.).
- Parameterization information for PMI may be information commonly applied to layers or may be information applied for each layer (or layer group) or rank.
- indication information eg, indicator
- indicating whether the CSI calculated by the terminal is based on the AI Model may also be included in the CSI and reported.
- the above-described examples may be applied in a situation where (only) the terminal is equipped with AI Model-based processing capability.
- it may be applied to a situation in which AI model-related training is performed in the base station/network, and the base station/network performs model transfer to the terminal so that the terminal is set to perform only inference. there is.
- Embodiments 1 and 2 may be applied and/or implemented alone or as a combination of the two embodiments.
- the present disclosure proposes a resource control and CSI-related signaling method suitable for such an environment.
- 21 is a diagram illustrating an operation of a terminal for a method for reporting channel state information according to an embodiment of the present disclosure.
- FIG. 21 illustrates an operation of a terminal based on the previously proposed methods (eg, any one of Embodiment 1 and Embodiment 2 and detailed embodiments thereof, or a combination of one or more (specific) embodiments).
- the example of FIG. 21 is for convenience of description and does not limit the scope of the present disclosure. Some step(s) illustrated in FIG. 21 may be omitted depending on circumstances and/or settings.
- the terminal in FIG. 21 is only one example, and may be implemented as a device illustrated in FIG. 23 below.
- the processor 102/202 of FIG. 23 may control transmission and reception of channels/signals/data/information using the transceiver 106/206, and may transmit or receive channels/signals/information. It can also be controlled to store data/information or the like in the memory 104/204.
- FIG. 21 may be processed by one or more processors 102 and 202 of FIG. 23 , and the operation of FIG. 21 may be performed to drive at least one processor (eg, 102 and 202) It may be stored in a memory (eg, one or more memories 104 and 204 of FIG. 23 ) in the form of a command/program (eg, instruction or executable code).
- a command/program eg, instruction or executable code
- step S2110 the terminal receives configuration information related to CSI reporting from the base station.
- the setting information may correspond to the setting information described in the above-described Embodiment 1 and/or Embodiment 2 (eg, setting information by higher layer signaling). That is, the setting information may include parameter(s) for applying the proposed method (eg, Embodiment 1 and/or Embodiment 2).
- the corresponding setting information may correspond to the CSI reporting-related setting information described in FIG. 20, and detailed descriptions of overlapping contents are omitted.
- step S2120 the terminal receives control information related to CSI reporting from the base station.
- control information may correspond to the setting information described in the above-described embodiment 1 and/or embodiment 2 (eg, control/instruction information by dynamic signaling). That is, the control information may include parameter(s) for applying the proposed method (eg, Embodiment 1 and/or Embodiment 2).
- the corresponding control information may correspond to the CSI reporting-related control information described with reference to FIG. 20, and a detailed description of overlapping content will be omitted.
- step S2130 the terminal performs CSI reporting to the base station based on the above-described configuration information and control information.
- CSI reporting may mean reporting CSI calculated/measured/predicted based on parameter(s) for applying the proposed method (eg, embodiment 1 and/or embodiment 2) to the base station.
- the corresponding CSI report may correspond to the CSI report described in FIG. 20, and detailed descriptions of overlapping contents are omitted.
- 22 is a diagram illustrating an operation of a base station for a method for reporting channel state information according to an embodiment of the present disclosure.
- FIG. 22 illustrates an operation of a base station based on the previously proposed methods (eg, any one of Embodiment 1 and Embodiment 2 and detailed embodiments thereof, or a combination of one or more (detailed) embodiments).
- the example of FIG. 22 is for convenience of description and does not limit the scope of the present disclosure. Some step(s) illustrated in FIG. 22 may be omitted depending on circumstances and/or settings.
- the base station in FIG. 22 is only one example, and may be implemented as a device illustrated in FIG. 23 below.
- the processor 102/202 of FIG. 23 may control transmission and reception of channels/signals/data/information using the transceiver 106/206, and may transmit or receive channels/signals/information. It can also be controlled to store data/information or the like in the memory 104/204.
- FIG. 22 may be processed by one or more processors 102 and 202 of FIG. 23, and the operation of FIG. 22 may be performed to drive at least one processor (eg, 102 and 202) of FIG. It may be stored in a memory (eg, one or more memories 104 and 204 of FIG. 23 ) in the form of a command/program (eg, instruction or executable code).
- a command/program eg, instruction or executable code
- step S2210 the base station transmits configuration information related to CSI reporting to the terminal.
- the setting information may correspond to the setting information described in the above-described Embodiment 1 and/or Embodiment 2 (eg, setting information by higher layer signaling). That is, the setting information may include parameter(s) for applying the proposed method (eg, Embodiment 1 and/or Embodiment 2).
- the corresponding setting information may correspond to the CSI reporting-related setting information described in FIG. 20, and detailed descriptions of overlapping contents are omitted.
- step S2220 the base station transmits control information related to CSI reporting to the terminal.
- control information may correspond to the setting information described in the above-described embodiment 1 and/or embodiment 2 (eg, control/instruction information by dynamic signaling). That is, the control information may include parameter(s) for applying the proposed method (eg, Embodiment 1 and/or Embodiment 2).
- the corresponding control information may correspond to the CSI reporting-related control information described with reference to FIG. 20, and a detailed description of overlapping content will be omitted.
- step S2230 the base station receives a CSI report based on the above-described configuration information and control information from the terminal.
- the CSI report may mean a calculated/measured/predicted CSI report based on parameter(s) for applying the proposed method (eg, embodiment 1 and/or embodiment 2).
- the corresponding CSI report may correspond to the CSI report described in FIG. 20, and detailed descriptions of overlapping contents are omitted.
- FIG. 23 illustrates a block configuration diagram of a wireless communication device according to an embodiment of the present disclosure.
- the first wireless device 100 and the second wireless device 200 may transmit and receive radio signals through various radio access technologies (eg, LTE and NR).
- various radio access technologies eg, LTE and NR.
- the first wireless device 100 includes one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and/or one or more antennas 108.
- the processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or flowcharts of operations set forth in this disclosure.
- the processor 102 may process information in the memory 104 to generate first information/signal, and transmit a radio signal including the first information/signal 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 from signal processing of 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 .
- memory 104 may perform some or all of the processes controlled by processor 102, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed in this disclosure. It may store software codes including them.
- the processor 102 and memory 104 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR).
- the transceiver 106 may be coupled to the processor 102 and may transmit and/or receive wireless signals via one or more antennas 108 .
- the transceiver 106 may include a transmitter and/or a receiver.
- the transceiver 106 may be used interchangeably with a radio frequency (RF) unit.
- a wireless device may mean a communication modem/circuit/chip.
- the second wireless device 200 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and/or one or more antennas 208.
- the processor 202 controls the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or flowcharts of operations set forth in this disclosure.
- the processor 202 may process information in the memory 204 to generate third information/signal, and 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 store information obtained from signal processing of 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 .
- memory 204 may perform some or all of the processes controlled by processor 202, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed in this disclosure. It may store software codes including them.
- the processor 202 and memory 204 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR).
- the transceiver 206 may be coupled to the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208 .
- the transceiver 206 may include a transmitter and/or a receiver.
- the transceiver 206 may be used interchangeably with an RF unit.
- a wireless device may mean a communication modem/circuit/chip.
- one or more protocol layers may be implemented by one or more processors 102, 202.
- one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP).
- One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) in accordance with the descriptions, functions, procedures, proposals, methods and/or operational flow charts disclosed herein.
- PDUs Protocol Data Units
- SDUs Service Data Units
- processors 102, 202 may generate messages, control information, data or information in accordance with the descriptions, functions, procedures, proposals, methods and/or operational flow diagrams set forth in this disclosure.
- One or more processors 102, 202 may process PDUs, SDUs, messages, control information, data or signals containing information (e.g., baseband signals) according to the functions, procedures, proposals and/or methods disclosed herein. generated and provided to one or more transceivers (106, 206).
- One or more processors 102, 202 may receive signals (e.g., baseband signals) from one or more transceivers 106, 206, the descriptions, functions, procedures, suggestions, methods and/or described in this disclosure.
- PDUs, SDUs, messages, control information, data or information may be acquired according to the operational flowcharts.
- One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor or microcomputer.
- One or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs Field Programmable Gate Arrays
- the descriptions, functions, procedures, proposals, methods and/or operational flow charts disclosed in this disclosure may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like.
- Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed in this disclosure may be included in one or more processors (102, 202) or stored in one or more memories (104, 204). It can be driven by the above processors 102 and 202.
- the descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed in this disclosure may be implemented using firmware or software in the form of codes, instructions and/or sets of instructions.
- One or more memories 104, 204 may be coupled with one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, codes, instructions and/or instructions.
- One or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof.
- One or more memories 104, 204 may be located internally and/or external to one or more processors 102, 202. Additionally, one or more memories 104, 204 may be coupled to one or more processors 102, 202 through various technologies, such as wired or wireless connections.
- One or more transceivers 106, 206 may transmit user data, control information, radio signals/channels, etc., as referred to in the methods and/or operational flow charts of this disclosure, to one or more other devices.
- the one or more transceivers 106, 206 may receive user data, control information, radio signals/channels, etc. referred to in the descriptions, functions, procedures, proposals, methods and/or operational flow charts, etc. disclosed in this disclosure from one or more other devices. there is.
- one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive wireless signals.
- one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or radio signals to one or more other devices. Additionally, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or radio signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled with one or more antennas 108, 208, and one or more transceivers 106, 206 may be connected to one or more antennas 108, 208, as described herein. , procedures, proposals, methods and / or operation flowcharts, etc. can be set to transmit and receive user data, control information, radio signals / channels, etc.
- one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports).
- One or more transceivers (106, 206) convert the received radio signals/channels from RF band signals in order to process the received user data, control information, radio signals/channels, etc. using one or more processors (102, 202). It can be converted into a baseband signal.
- One or more transceivers 106 and 206 may convert user data, control information, and radio signals/channels processed by one or more processors 102 and 202 from baseband signals to RF band signals.
- one or more of the transceivers 106, 206 may include (analog) oscillators and/or filters.
- the scope of the present disclosure is software or machine-executable instructions (eg, operating systems, applications, firmware, programs, etc.) that cause operations in accordance with the methods of various embodiments to be executed on a device or computer, and such software or It includes a non-transitory computer-readable medium in which instructions and the like are stored and executable on a device or computer. Instructions that may be used to program a processing system that performs the features described in this disclosure may be stored on/in a storage medium or computer-readable storage medium and may be viewed using a computer program product that includes such storage medium. Features described in the disclosure may be implemented.
- the storage medium may include, but is not limited to, high speed random access memory such as DRAM, SRAM, DDR RAM or other random access solid state memory devices, one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or It may include non-volatile memory, such as other non-volatile solid state storage devices.
- the memory optionally includes one or more storage devices located remotely from the processor(s).
- the memory, or alternatively, the non-volatile memory device(s) within the memory includes non-transitory computer readable storage media.
- Features described in this disclosure may be stored on any one of the machine readable media to control hardware of a processing system and to allow the processing system to interact with other mechanisms that utilize results according to embodiments of the present disclosure. It may be integrated into software and/or firmware.
- Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments/containers.
- the wireless communication technology implemented in the wireless devices 100 and 200 of the present disclosure may include Narrowband Internet of Things for low power communication as well as LTE, NR, and 6G.
- NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. not.
- the wireless communication technology implemented in the wireless device (XXX, YYY) of the present disclosure may perform communication based on LTE-M technology.
- LTE-M technology may be an example of LPWAN technology, and may be called various names such as eMTC (enhanced machine type communication).
- LTE-M technologies are 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 Communication, and/or 7) It may be implemented in at least one of various standards such as LTE M, and is not limited to the above-mentioned names.
- the wireless communication technology implemented in the wireless device (XXX, YYY) of the present disclosure includes at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low power communication. It may include any one, and is not limited to the above-mentioned names.
- ZigBee technology can generate personal area networks (PANs) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and can be called various names.
- PANs personal area networks
- the method proposed in the present disclosure has been described focusing on examples applied to 3GPP LTE/LTE-A and 5G systems, but can be applied to various wireless communication systems other than 3GPP LTE/LTE-A and 5G systems.
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Abstract
Description
μ | Δf=2μ·15 [kHz] | CP |
0 | 15 | 일반(Normal) |
1 | 30 | 일반 |
2 | 60 | 일반, 확장(Extended) |
3 | 120 | 일반 |
4 | 240 | 일반 |
주파수 범위 지정(Frequency Range designation) | 해당 주파수 범위(Corresponding frequency range) | 서브캐리어 간격(Subcarrier Spacing) |
FR1 | 410MHz - 7125MHz | 15, 30, 60kHz |
FR2 | 24250MHz - 52600MHz | 60, 120, 240kHz |
μ | Nsymb slot | Nslot frame,μ | Nslot subframe,μ |
0 | 14 | 10 | 1 |
1 | 14 | 20 | 2 |
2 | 14 | 40 | 4 |
3 | 14 | 80 | 8 |
4 | 14 | 160 | 16 |
μ | Nsymb slot | Nslot frame,μ | Nslot subframe,μ |
2 | 12 | 40 | 4 |
DCI 포맷 | 활용 |
0_0 | 하나의 셀 내 PUSCH의 스케줄링 |
0_1 | 하나의 셀 내 하나 또는 다중 PUSCH의 스케줄링, 또는 UE에게 셀 그룹(CG: cell group) 하향링크 피드백 정보의 지시 |
0_2 | 하나의 셀 내 PUSCH의 스케줄링 |
1_0 | 하나의 DL 셀 내 PDSCH의 스케줄링 |
1_1 | 하나의 셀 내 PDSCH의 스케줄링 |
1_2 | 하나의 셀 내 PDSCH의 스케줄링 |
- 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 configured as for the PDSCH reception - The bandwidth as configured for the corresponding CQI report. - The reference resource uses the CP length and subcarrier spacing configured for PDSCH reception - No resource elements used by primary or secondary synchronization signals or PBCH. - Redundancy Version 0. - The ratio of PDSCH EPRE to CSI-RS EPRE - Assume no REs allocated for NZP CSI-RS and ZP CSI-RS. - Assume the same number of front-loaded DM-RS symbols as the maximum front-loaded symbols configured by the higher layer parameter maxLength in DMRS-DownlinkConfig. - Assume the same number of additional DM-RS symbols as the additional symbols configured by the higher layer parameter dmrs-AdditionalPosition. - Assume the PDSCH symbols are not containing DM-RS. - Assume PRB bundling size of 2 PRBs |
Claims (17)
- 무선 통신 시스템에서 단말에 의해서 채널 상태 정보(channel state information, CSI) 보고를 수행하는 방법에 있어서, 상기 방법은:기지국으로부터, 상기 CSI 보고와 관련된 설정 정보를 수신하는 단계;상기 기지국으로부터, 상기 설정 정보에 기반하는 제어 정보를 수신하는 단계; 및상기 설정 정보 및 상기 제어 정보에 기반하여, 상기 CSI 보고를 수행하는 단계를 포함하되,상기 CSI 보고 이후에 상기 기지국에 의한 데이터 스케줄링이 수행될 것임에 기반하여, 상기 CSI 보고는 상기 데이터 스케줄링의 시점에서의 채널 상태에 대한 정보에 기반하는, 방법.
- 제 1항에 있어서,상기 설정 정보 또는 상기 제어 정보 중 적어도 하나는, 상기 CSI 보고를 나르는(carrying) 물리 상향링크 제어 채널(physical uplink control channel, PUCCH) 또는 물리 상향링크 공유 채널(physical uplink shared channel, PUSCH) 중 적어도 하나에 대한 페이로드 지시 정보(payload indication information)를 포함하는, 방법.
- 제 2항에 있어서,상기 페이로드 지시 정보가 PUCCH에 대한 것임에 기반하여, 상기 페이로드 지시 정보는 상기 PUCCH의 포맷(format)과 연관되어 설정되는, 방법.
- 제 2항에 있어서,상기 페이로드 지시 정보에 기반하여, 상기 CSI 보고에 대한 코드북 파라미터는 인공 지능(Artificial Intelligence) 모델을 이용하여 결정되는, 방법.
- 제 1항에 있어서,상기 제어 정보는, 상기 CSI 보고의 시점 또는 상기 데이터 스케줄링의 시점 중 어느 하나에서의 랭크(rank) 값을 나타내는 정보를 포함하며,상기 CSI 보고는 상기 랭크 값에 기반하여 수행되는, 방법.
- 제 1항에 있어서,상기 설정 정보는, 상기 CSI 보고와 관련된 다수의 보고 대상들에 대한 정보를 포함하고,상기 제어 정보는, 상기 다수의 보고 대상들 중 적어도 하나의 보고 대상을 나타내는 정보를 포함하며,상기 CSI 보고는, 상기 적어도 하나의 보고 대상에 기반하는, 방법.
- 제 6항에 있어서,상기 CSI 보고는, 상기 다수의 보고 대상들 중 상기 적어도 하나의 보고 대상을 제외한 나머지 보고 대상에 대한 차이 값(differential value)에 더 기반하는, 방법.
- 제 1항에 있어서,상기 설정 정보는, 상기 CSI 보고를 위한 하나 이상의 주파수 영역 자원들을 나타내는 정보를 포함하고,상기 제어 정보는, 상기 하나 이상의 주파수 영역 자원들 중 적어도 하나의 특정 주파수 영역 자원을 나타내는 정보를 포함하며,상기 적어도 하나의 특정 주파수 영역 자원은, 상기 데이터 스케줄링에 따른 주파수 영역 자원 할당과 연관되는, 방법.
- 제 1항에 있어서,상기 설정 정보는, 상기 CSI 보고를 위한 참조 자원(reference resource)과 관련된 적어도 하나의 파라미터를 포함하고,상기 제어 정보는, 상기 적어도 하나의 파라미터에 대한 조정 값을 포함하는, 방법.
- 제 1항에 있어서,상기 CSI 보고는, 상기 데이터 스케줄링 시점에서의 전송 방식(transmission scheme)에 대한 정보에 더 기반하며,상기 전송 방식에 대한 정보는, 프리코딩 방식(precoding scheme) 또는 자원 할당 정보 중 적어도 하나를 포함하는, 방법.
- 제 1항에 있어서,상기 설정 정보는, 상위 계층 시그널링(higher layer signaling)을 통해 수신되고,상기 제어 정보는, 동적 시그널링(dynamic signaling)을 통해 수신되는, 방법.
- 제 1항에 있어서,상기 설정 정보, 상기 제어 정보, 또는 상기 데이터 스케줄링의 시점에서의 채널 상태에 대한 정보 중 적어도 하나는, 상기 기지국 또는 상기 단말에 의해 인공 지능(Artificial Intelligence) 모델을 이용하여 하나 이상의 입력에 기반하여 계산된 출력 값인, 방법.
- 무선 통신 시스템에서 채널 상태 정보(channel state information, CSI) 보고를 수행하는 단말에 있어서, 상기 단말은:하나 이상의 송수신기; 및상기 하나 이상의 송수신기와 연결된 하나 이상의 프로세서를 포함하고,상기 하나 이상의 프로세서는:기지국으로부터, 상기 CSI 보고와 관련된 설정 정보를 수신하고;상기 기지국으로부터, 상기 설정 정보에 기반하는 제어 정보를 수신하고; 및상기 설정 정보 및 상기 제어 정보에 기반하여, 상기 CSI 보고를 수행하도록 설정되고,상기 CSI 보고 이후에 상기 기지국에 의한 데이터 스케줄링이 수행될 것임에 기반하여, 상기 CSI 보고는 상기 데이터 스케줄링의 시점에서의 채널 상태에 대한 정보에 기반하는, 단말.
- 무선 통신 시스템에서 기지국에 의해서 채널 상태 정보(channel state information, CSI) 보고를 수신하는 방법에 있어서, 상기 방법은:단말로, 상기 CSI 보고와 관련된 설정 정보를 전송하는 단계;상기 단말로, 상기 설정 정보에 기반하는 제어 정보를 전송하는 단계; 및상기 단말로부터, 상기 설정 정보 및 상기 제어 정보에 기반하는 상기 CSI 보고를 수신하는 단계를 포함하되,상기 CSI 보고 이후에 상기 기지국에 의한 데이터 스케줄링이 수행될 것임에 기반하여, 상기 CSI 보고는 상기 데이터 스케줄링의 시점에서의 채널 상태에 대한 정보에 기반하는, 방법.
- 무선 통신 시스템에서 채널 상태 정보(channel state information, CSI) 보고를 수신하는 기지국에 있어서, 상기 기지국은:하나 이상의 송수신기; 및상기 하나 이상의 송수신기와 연결된 하나 이상의 프로세서를 포함하고,상기 하나 이상의 프로세서는:단말로, 상기 CSI 보고와 관련된 설정 정보를 전송하고;상기 단말로, 상기 설정 정보에 기반하는 제어 정보를 전송하고; 및상기 단말로부터, 상기 설정 정보 및 상기 제어 정보에 기반하는 상기 CSI 보고를 수신하도록 설정되고,상기 CSI 보고 이후에 상기 기지국에 의한 데이터 스케줄링이 수행될 것임에 기반하여, 상기 CSI 보고는 상기 데이터 스케줄링의 시점에서의 채널 상태에 대한 정보에 기반하는, 기지국.
- 무선 통신 시스템에서 채널 상태 정보(channel state information, CSI) 보고를 수행하기 위해 단말을 제어하도록 설정되는 프로세싱 장치에 있어서, 상기 프로세싱 장치는:하나 이상의 프로세서; 및상기 하나 이상의 프로세서에 동작 가능하게 연결되고, 상기 하나 이상의 프로세서에 의해 실행됨에 기반하여, 동작들을 수행하는 명령들을 저장하는 하나 이상의 컴퓨터 메모리를 포함하며,상기 동작들은:기지국으로부터, 상기 CSI 보고와 관련된 설정 정보를 수신하는 동작;상기 기지국으로부터, 상기 설정 정보에 기반하는 제어 정보를 수신하는 동작; 및상기 설정 정보 및 상기 제어 정보에 기반하여, 상기 CSI 보고를 수행하는 동작을 포함하되,상기 CSI 보고 이후에 상기 기지국에 의한 데이터 스케줄링이 수행될 것임에 기반하여, 상기 CSI 보고는 상기 데이터 스케줄링의 시점에서의 채널 상태에 대한 정보에 기반하는, 프로세싱 장치.
- 하나 이상의 명령을 저장하는 하나 이상의 비-일시적(non-transitory) 컴퓨터 판독가능 매체로서,상기 하나 이상의 명령은 하나 이상의 프로세서에 의해서 실행되어, 무선 통신 시스템에서 채널 상태 정보(channel state information, CSI) 보고를 수행하는 장치가:기지국으로부터, 상기 CSI 보고와 관련된 설정 정보를 수신하고;상기 기지국으로부터, 상기 설정 정보에 기반하는 제어 정보를 수신하고; 및상기 설정 정보 및 상기 제어 정보에 기반하여, 상기 CSI 보고를 수행하도록 제어하고,상기 CSI 보고 이후에 상기 기지국에 의한 데이터 스케줄링이 수행될 것임에 기반하여, 상기 CSI 보고는 상기 데이터 스케줄링의 시점에서의 채널 상태에 대한 정보에 기반하는, 컴퓨터 판독가능 매체.
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