WO2023287147A1 - 무선 통신 시스템에서 복조 참조 신호 송수신 방법 및 장치 - Google Patents
무선 통신 시스템에서 복조 참조 신호 송수신 방법 및 장치 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H—ELECTRICITY
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- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
- H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling
Definitions
- the present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving a demodulation reference signal (DM-RS) in a wireless communication system.
- DM-RS demodulation reference signal
- 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 a DM-RS.
- an additional technical problem of the present disclosure is to provide a method and apparatus for configuring a pattern in which a DM-RS is mapped in a frequency-time resource.
- a method of receiving a demodulation reference signal (DM-RS) in a wireless communication system includes: receiving configuration information related to a DM-RS from a base station; Receiving downlink control information (DCI) for scheduling a physical downlink control channel (PDSCH) from the base station; and receiving the PDSCH and a DM-RS for the PDSCH based on the DCI.
- DCI downlink control information
- the DM among the first DM-RS pattern and the second DM-RS pattern -The pattern of RS can be determined.
- a method for transmitting a demodulation reference signal (DM-RS) in a wireless communication system includes: transmitting configuration information related to a DM-RS to a terminal; Transmitting downlink control information (DCI) for scheduling a physical downlink control channel (PDSCH) to the terminal; and transmitting the PDSCH and a DM-RS for the PDSCH based on the DCI.
- DCI downlink control information
- the DM among the first DM-RS pattern and the second DM-RS pattern -The pattern of RS can be determined.
- lower overhead and more antenna ports can be supported compared to the existing DM-RS pattern.
- throughput for data transmission and reception can be improved by reducing DM-RS overhead and applying an optimized DM-RS pattern.
- 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 DM-RS configuration type in a wireless communication system to which the present disclosure may be applied.
- FIG 8 illustrates a DL DM-RS transmission and reception procedure in a wireless communication system to which the present disclosure can be applied.
- FIG 9 illustrates a CDM group according to an embodiment of the present disclosure.
- FIG. 10 illustrates a signaling procedure between a base station and a terminal for a DM-RS transmission and reception method according to an embodiment of the present disclosure.
- FIG. 11 illustrates an operation of a terminal for a DM-RS transmission/reception method according to an embodiment of the present disclosure.
- FIG. 12 illustrates an operation of a base station for a DM-RS transmission/reception method according to an embodiment of the present disclosure.
- FIG. 13 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 ⁇ may 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.
- the DM-RS is characterized in that it is transmitted only when necessary to enhance network energy efficiency and ensure forward compatibility.
- the time domain density of the DM-RS may vary depending on the speed or mobility of the UE. That is, the density of the DM-RS can be increased in the time domain to track the fast change of the radio channel in NR.
- DL means signal transmission (or communication) from a base station to a terminal.
- the UE When receiving a PDSCH scheduled by DCI format 1_0 or before receiving a PDSCH prior to any dedicated upper layer configuration among dmrs-AdditionalPosition, maxLength and dmrs-Type parameters, the UE i) PDSCH mapping type B PDSCH does not exist in any symbol carrying DM-RS except for PDSCH with an allocation duration of 2 symbols with ii) single of configuration type 1 on DM-RS port 1000 It is assumed that a symbol front-loaded DM-RS is transmitted and iii) all of the remaining orthogonal antenna ports are not related to PDSCH transmission to other terminals. additionally,
- the front-loaded DM-RS symbol is the 1st of the PDSCH allocation duration
- the UE assumes that one additional single symbol DM-RS exists in the 5th or 6th symbol. Otherwise, the UE assumes that no additional DM-RS symbol exists.
- the UE assumes that no additional DM-RS exists
- the UE assumes that no additional DM-RS exists, and the UE assumes that the PDSCH exists within a symbol carrying the DM-RS.
- the UE can be configured with the higher layer parameter dmrs-Type, and the configured DM-RS configuration type is used to receive the PDSCH.
- the UE may be set to the maximum number of front-loaded DM-RS symbols for the PDSCH by the upper layer parameter maxLength given by DMRS-DownlinkConfig.
- the UE may schedule the number of DM-RS ports by the antenna port index of DCI format 1_1.
- FIG. 7 illustrates a DM-RS configuration type in a wireless communication system to which the present disclosure may be applied.
- FIG. 7 represents DM-RS configuration type 1
- (b) of FIG. 7 represents DM-RS configuration type 2.
- the DM-RS configuration type of FIG. 7 is set by the dmrs-Type parameter in the DMRS-DownlinkConfig IE of Table 6.
- DM-RS configuration type 1 has a higher RS density in the frequency domain and supports up to 4 (8) ports for single (double)-symbol DM-RS.
- DM-RS configuration type 1 supports length 2 F-CDM and FDM for single-symbol DM-RS, and supports length 2 F/T-CDM and FDM for double-symbol DM-RS.
- DM-RS configuration type 2 supports more DM-RS antenna ports, and supports up to 6 (12) ports for single (double)-symbol DM-RS.
- Table 6 is a table showing an example of DMRS-DownlinkConfig IE used to configure downlink DM-RS for PDSCH.
- DMRS-DownlinkConfig SEQUENCE ⁇ dmrs-Type ENUMERATED ⁇ type2 ⁇ OPTIONAL, -- Need S dmrs-AdditionalPosition ENUMERATED ⁇ pos0, pos1, pos3 ⁇ OPTIONAL, -- Need S maxLength ENUMERATED ⁇ len2 ⁇ OPTIONAL, -- Need S scramblingID0 INTEGER (0..65535) OPTIONAL, -- Need S scramblingID1 INTEGER (0..65535) OPTIONAL, -- Need S phaseTrackingRS SetupRelease ⁇ PTRS-DownlinkConfig ⁇ OPTIONAL, -- Need M ... ⁇ --TAG-DMRS-DOWNLINKCONFIG-STOP -- ASN1STOP
- the dmrs-AdditionalPosition parameter indicates the position of an additional DM-RS in the DL, and when the corresponding parameter does not exist, the UE applies the pos2 value.
- the Dmrs-Type parameter indicates selection of a DM-RS type to be used for DL, and when the corresponding parameter does not exist, the UE uses DM-RS type 1.
- the Max-Length parameter represents the maximum number of OFDM symbols for DL front loaded DM-RS, and len1 corresponds to a value of 1.
- the PhaseTrackingRS parameter configures DL PTRS, and if the corresponding parameter does not exist or is revoked, the UE assumes that there is no DL PTRS.
- the terminal remains It can be assumed that all of the orthogonal antenna ports present are not associated with PDSCH transmission to other terminals.
- the UE selects the remaining orthogonal antenna ports It can be assumed that all of them are not associated with PDSCH transmission to other terminals.
- FIG 8 illustrates a DL DM-RS transmission and reception procedure in a wireless communication system to which the present disclosure can be applied.
- the base station transmits DM-RS configuration information to the terminal (S110).
- the DM-RS configuration information may refer to a DMRS-DownlinkConfig IE.
- the DMRS-DownlinkConfig IE may include a dmrs-Type parameter, a dmrs-AdditionalPosition parameter, a maxLength parameter, and a phaseTrackingRS parameter.
- the dmrs-Type parameter is a parameter for selecting a DM-RS type to be used for DL.
- DM-RS can be divided into two configuration types: (1) DM-RS configuration type 1 and (2) DM-RS configuration type 2.
- DM-RS configuration type 1 is a type having a higher RS density in the frequency domain
- DM-RS configuration type 2 is a type having more DM-RS antenna ports.
- the dmrs-AdditionalPosition parameter is a parameter indicating the position of an additional DM-RS in the DL.
- the first position of the front-loaded DM-RS is determined according to the PDSCH mapping type (type A or type B), and an additional DM-RS is provided to support high speed terminals. can be set.
- the front-loaded DM-RS occupies 1 or 2 consecutive OFDM symbols, and is indicated by RRC signaling and downlink control information (DCI).
- the maxLength parameter is a parameter representing the maximum number of OFDM symbols for DL front-loaded DM-RS.
- the phaseTrackingRS parameter is a parameter for setting DL PTRS.
- the base station generates a sequence used for DM-RS (S120).
- the sequence for the DM-RS is generated according to Equation 3 below.
- the pseudo-random sequence c(i) is defined in 3gpp TS 38.211 5.2.1. That is, c(i) may be a Gold sequence of length-31 using two m-sequences.
- a pseudo-random sequence generator is initialized by Equation 4 below.
- l is the number of OFDM symbols in a slot
- n s,f ⁇ is a slot number in a frame.
- PDSCH is DCI with CRC scrambled by C-RNTI, MCS-C-RNTI or CS-RNTI
- C-RNTI C-RNTI
- MCS-C-RNTI MCS-C-RNTI
- CS-RNTI CS-RNTI
- PDSCH uses DCI format 1_0 with CRC scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI If it is scheduled by PDCCH, it is given by upper layer parameter scramblingID0 in DMRS-DownlinkConfig IE.
- n_SCID N ID cell , otherwise, quantity n SCID ⁇ ⁇ 0,1 ⁇ is given by the DM-RS sequence initialization field in DCI associated with PDSCH transmission when DCI format 1_1 is used.
- the base station maps the generated sequence to a resource element (S130).
- the resource element may mean including at least one of time, frequency, antenna port, or code.
- the base station transmits the DM-RS to the terminal on the resource element (S140).
- the terminal receives the PDSCH using the received DM-RS.
- UL means signal transmission (or communication) from a terminal to a base station.
- the operation related to UL DM-RS is similar to the operation related to Salpin DL DM-RS, and names of parameters related to DL may be replaced with names of parameters related to UL.
- DMRS-DownlinkConfig IE can be replaced with DMRS-UplinkConfig IE
- PDSCH mapping type can be replaced with PUSCH mapping type
- PDSCH can be replaced with PUSCH.
- a base station can be replaced by a terminal
- a terminal can be replaced by a base station.
- Sequence generation for UL DM-RS may be defined differently depending on whether transform precoding is enabled.
- the DM-RS uses a PN sequence when CP-OFDM (cyclic prefix orthogonal frequency division multiplexing) is used (or when transform precoding is not enabled), and DFT-s-OFDM (Discrete Fourier Transform- spread-OFDM) is used (when transform precoding is enabled), a ZC sequence having a length of 30 or more is used.
- CP-OFDM cyclic prefix orthogonal frequency division multiplexing
- DFT-s-OFDM Discrete Fourier Transform- spread-OFDM
- Table 7 is a table showing an example of DMRS-UplinkConfig IE used to configure uplink DM-RS for PUSCH.
- DMRS-UplinkConfig SEQUENCE ⁇ dmrs-Type ENUMERATED ⁇ type2 ⁇ OPTIONAL, -- Need S dmrs-AdditionalPosition ENUMERATED ⁇ pos0, pos1, pos3 ⁇ OPTIONAL, -- Need S phaseTrackingRS SetupRelease ⁇ PTRS-UplinkConfig ⁇ OPTIONAL, -- Need M maxLength ENUMERATED ⁇ len2 ⁇ OPTIONAL, -- Need S transformPrecodingDisabled SEQUENCE ⁇ scramblingID0 INTEGER (0..65535) OPTIONAL, -- Need S scramblingID1 INTEGER (0..65535) OPTIONAL, -- Need S ...
- OPTIONAL -- Need R transformPrecodingEnabled SEQUENCE ⁇ nPUSCH-Identity INTEGER(0..1007) OPTIONAL, -- Need S sequenceGroupHopping ENUMERATED ⁇ disabled ⁇ OPTIONAL, -- Need S sequenceHopping ENUMERATED ⁇ enabled ⁇ OPTIONAL, -- Need S ... ⁇ OPTIONAL, -- Need R ... ⁇ --TAG-DMRS-UPLINKCONFIG-STOP -- ASN1STO
- the dmrs-AdditionalPosition parameter indicates the position of an additional DM-RS in the UL, and when the corresponding parameter does not exist, the UE applies the pos2 value.
- the Dmrs-Type parameter indicates selection of a DM-RS type to be used for UL, and when the corresponding parameter does not exist, the UE uses DM-RS type 1.
- the Max-Length parameter indicates the maximum number of OFDM symbols for the UL front loaded DM-RS, and len1 corresponds to a value of 1.
- the PhaseTrackingRS parameter configures UL PTRS.
- the tranformPrecodingdisabled parameter indicates DM-RS related parameters for Cyclic Prefix OFDM
- the transformPrecodingEnabled parameter indicates DM-RS related parameters for DFT-s-OFDM (Transform Precoding).
- the UE DM-RS At port 0, a single symbol front-loaded DM-RS of configuration type 1 is used.
- the remaining REs not used for DM-RS in the symbols are not used for any PUSCH transmission except for a PUSCH having an allocation duration of 2 or less OFDM symbols with disabled transform precoding. Additional DM-RS may be transmitted according to the scheduling type and PUSCH duration in consideration of whether frequency hopping is enabled.
- the UE assumes that dmrs-AdditionalPosition is equal to 'pos2' and up to two additional DM-RSs can be transmitted according to the duration of the PUSCH.
- the UE assumes that dmrs-AdditionalPosition is equal to 'pos1' and that up to one additional DM-RS can be transmitted according to the duration of the PUSCH.
- the UE configures the configuration type provided by the upper layer parameter dmrs-Type of configuredGrantConfig on DM-RS port 0.
- Use single symbol front-loaded DM-RS, and the remaining REs not used for DM-RS in the symbols have an allocation duration of 2 or less OFDM symbols with disabled transform precoding PUSCH It is not used for any PUSCH transmission except for, and an additional DM-RS having dmrs-AdditionalPosition from configuredGrantConfig can be transmitted based on the scheduling type and PUSCH duration in consideration of whether frequency hopping is enabled.
- the transmitted PUSCH is scheduled by DCI format 0_1 with a CRC scrambled by C-RNTI, CS-RNTI or MCS-RNTI or corresponds to a configured grant,
- the terminal can be configured as a higher layer parameter dmrs-Type in DMRS-UplinkConfig, and the configured DM-RS configuration type is used for PUSCH transmission.
- the UE may be set to the maximum number of front-loaded DM-RS symbols for the PUSCH by the upper layer parameter maxLength in DMRS-UplinkConfig.
- the UE transmitting the PUSCH is set as the upper layer parameter phaseTrackingRS in DMRS-UplinkConfig, the UE can assume that the following settings do not occur simultaneously for the transmitted PUSCH.
- DM-RS configuration type 1 and type 2 For DM-RS configuration type 1 and type 2, an arbitrary DM-RS port among 4-7 or 6-11 is scheduled for each UE, and PT-RS is transmitted from the UE.
- the UE For PUSCH scheduled by DCI format 0_1, by activation DCI format 0_1 with CRC scrambled by CS-RNTI or by configured grant type 1 configuration, the UE cannot use the DM-RS CDM group for data transmission. Assume no.
- AI Artificial intelligence
- ML Machine learning
- DL Deep learning
- methods for improving performance by applying AI/ML/DL algorithms are being studied in various fields such as natural language processing, voice recognition, and low-definition image recovery.
- wireless communication many studies are being conducted to provide superior performance compared to existing system performance by applying AI/ML/DL algorithms.
- research is being conducted on how to apply the AI / ML / DL algorithm to the channel estimation part, thereby reducing RS overhead and providing better performance at the same time.
- the frequency domain (FD: frequency domain) / time domain (TD: time domain) density is good.
- FD frequency domain
- TD time domain
- L1 (layer 1) signaling may mean DCI-based dynamic signaling between a base station and a terminal
- L2 (layer 2) signaling is an RRC / MAC control element (CE) between a base station and a terminal : This may mean higher layer signaling based on a control element.
- a DM-RS antenna port or a DM-RS port may be interpreted in the same meaning.
- a port number exemplified as a DM-RS antenna port or a DM-RS port corresponds to one example and the present disclosure is not construed as being limited thereto.
- a method for a terminal to report its preferred RS density eg, frequency / time density
- a method for the base station to set/instruct a specific RS pattern For example, based on AI / ML / DL implementation, a method for a terminal to report its preferred RS density (eg, frequency / time density) to a base station, and based on the reported value
- RS density eg, frequency / time density
- Embodiment #A1 Regarding PDSCH/PUSCH DM-RS, a plurality of sub-CDM groups may be defined in a single code division multiplexing (CDM) group.
- CDM code division multiplexing
- the CDM group may mean a group of antenna ports that share the same resource element (RE) to which DM-RSs are mapped without data.
- the number of CDM groups may be indicated by DCI (eg, antenna port field), and values 1, 2, and 3 of the number of dataless CDM groups are CDM groups ⁇ 0 ⁇ , ⁇ 0,1 ⁇ , ⁇ 0,1,2 ⁇ .
- the Sub-CDM group may be defined as a (minimum) unit of an RE group to which a frequency domain-orthogonal cover code (FD-OCC) is applied within a single CDM group.
- FD-OCC frequency domain-orthogonal cover code
- a sub-CDM group may be defined for each RE group to which FD-OCC is applied, grouping x RE groups to which FD-OCC is applied (x is a natural number of 2 or more), and A sub-CDM group may be defined.
- a plurality of sub-CDM groups may be defined, such as one or more within a single CDM group.
- the number of sub-CDM groups in a single CDM group may be predefined/determined or set/instructed by a base station (eg, L2/L1 signaling).
- a plurality of grouping methods with different numbers of Sub-CDM groups in a single CDM group may be defined.
- DM-RS REs may be grouped to define 2 Sub-CDM groups within a single CDM group, or DM-RS REs may be grouped to define 4 Sub-CDM groups.
- a Sub-CDM grouping index for each grouping method may be defined.
- the Sub-CDM grouping index may be set/instructed (eg, L2/L1 signaling) to the UE by the base station. This will be described in more detail with reference to FIG. 9 .
- a sub-CDM group may be defined to have a pattern that is repeated in specific PRB units (eg, 2 PRBs). For example, different Sub-CDM grouping indexes may be set/instructed for each specific PRB(s).
- FIG 9 illustrates a CDM group according to an embodiment of the present disclosure.
- FIG. 9(a) illustrates a CDM group when DM-RS configuration type 1 is configured for a DM-RS pattern in the frequency domain
- FIG. 9(b) illustrates DM-RS configuration for a DM-RS pattern in the frequency domain.
- a CDM group when type 2 is set is exemplified.
- mapping patterns ie, shaded boxes
- SCs subcarriers
- REs subcarriers
- the RS pattern ie, shaded boxes
- the RS pattern represents a subcarrier (or RE) to which the DM-RS is mapped (carrying the DM-RS).
- the sub-CDM grouping index (this name corresponds to one example, and other names can be used if the index can distinguish the CDM group) according to 0, 1, 2, 3 Illustrate CDM group.
- Sub-CDM grouping index 0 indicates a case where the number of sub-CDM groups is 0. That is, it represents a single CDM group.
- a plurality of DM-RS ports may be supported based on the CDM group. That is, DM-RSs of different antenna ports may be mapped to the same REs according to the RS pattern for the CDM group in a CDM manner. For example, DM-RSs of antenna ports p (p is a natural number) and p+1 may be mapped to the RS pattern for CDM group #0 using the CDM method.
- Sub-CDM grouping index 1 indicates a case where the number of sub-CDM groups is 2.
- a plurality of DM-RS ports may be supported based on the Sub-CDM group. That is, DM-RSs of different antenna ports may be mapped to the same REs according to an RS pattern for each sub-CDM group in a CDM manner. For example, DM-RSs of antenna ports p (p is a natural number) and p+1 may be mapped to the RS pattern for CDM sub-group #0 by the CDM method, and the RS pattern for CDM sub-group #1 DM-RSs of antenna ports p+2 and p+3 may be mapped in the CDM scheme. Also, for example, since the number of sub-CDM groups is 2, twice as many DM-RS antenna ports can be supported as compared to the case of sub-CDM grouping index 0.
- Sub-CDM grouping index 2 indicates a case where the number of sub-CDM groups is 3.
- a plurality of DM-RS ports may be supported based on the Sub-CDM group. That is, DM-RSs of different antenna ports may be mapped to the same REs according to an RS pattern for each sub-CDM group in a CDM manner.
- DM-RSs of antenna ports p (p is a natural number) and p+1 may be mapped to the RS pattern for CDM sub-group #0 by the CDM method, and the RS pattern for CDM sub-group #1 DM-RSs of antenna ports p + 2 and p + 3 can be mapped by CDM method, and DM-RSs of antenna ports p + 4 and p + 5 are CDM method in the RS pattern for CDM sub-group # 2 can be mapped to Also, for example, since the number of sub-CDM groups is 3, 3 times more DM-RS antenna ports can be supported than in the case of sub-CDM grouping index 0.
- Sub-CDM grouping index 3 indicates a case where the number of sub-CDM groups is 6.
- a plurality of DM-RS ports may be supported based on the Sub-CDM group. That is, DM-RSs of different antenna ports may be mapped to the same REs according to an RS pattern for each sub-CDM group in a CDM manner.
- DM-RSs of antenna ports p (p is a natural number) and p+1 may be mapped to the RS pattern for CDM sub-group #0 by the CDM method, and the RS pattern for CDM sub-group #1 DM-RSs of antenna ports p + 2 and p + 3 can be mapped by CDM method, and DM-RSs of antenna ports p + 4 and p + 5 are CDM method in the RS pattern for CDM sub-group # 2 , and the DM-RSs of antenna ports p + 6 and p + 7 can be mapped in the CDM method to the RS pattern for CDM sub-group # 3, and to the RS pattern for CDM sub-group # 4
- the DM-RSs of antenna ports p+8 and p+9 can be mapped in the CDM method, and the DM-RSs of antenna ports p+10 and p+11 are CDM in the RS pattern for CDM sub-group #5. can be mapped. Also, for example, since the number of
- the sub-CDM grouping index (this name corresponds to one example, and other names can be used if the index can distinguish the CDM group) CDM groups according to 0, 1, and 2 exemplify
- Sub-CDM grouping index 0 indicates a case where the number of sub-CDM groups is 0. That is, it represents a single CDM group.
- a plurality of DM-RS ports may be supported based on the CDM group. That is, DM-RSs of different antenna ports may be mapped to the same REs according to the RS pattern for the CDM group in a CDM manner. For example, DM-RSs of antenna ports p (p is a natural number) and p+1 may be mapped to the RS pattern for CDM group #0 using the CDM method.
- Sub-CDM grouping index 1 indicates a case where the number of sub-CDM groups is 2.
- a plurality of DM-RS ports may be supported based on the Sub-CDM group. That is, DM-RSs of different antenna ports may be mapped to the same REs according to an RS pattern for each sub-CDM group in a CDM manner. For example, DM-RSs of antenna ports p (p is a natural number) and p+1 may be mapped to the RS pattern for CDM sub-group #0 by the CDM method, and the RS pattern for CDM sub-group #1 DM-RSs of antenna ports p+2 and p+3 may be mapped in the CDM scheme. Also, for example, since the number of sub-CDM groups is 2, twice as many DM-RS antenna ports can be supported as compared to the case of sub-CDM grouping index 0.
- Sub-CDM grouping index 2 indicates a case where the number of sub-CDM groups is 4.
- a plurality of DM-RS ports may be supported based on the Sub-CDM group. That is, DM-RSs of different antenna ports may be mapped to the same REs according to an RS pattern for each sub-CDM group in a CDM manner.
- DM-RSs of antenna ports p (p is a natural number) and p+1 may be mapped to the RS pattern for CDM sub-group #0 by the CDM method, and the RS pattern for CDM sub-group #1 DM-RSs of antenna ports p + 2 and p + 3 can be mapped by CDM method, and DM-RSs of antenna ports p + 4 and p + 5 are CDM method in the RS pattern for CDM sub-group # 2 , and the DM-RSs of antenna ports p+6 and p+7 can be mapped to the RS pattern for CDM sub-group #3 in the CDM manner.
- the number of sub-CDM groups is 4, 4 times more DM-RS antenna ports can be supported than in the case of sub-CDM grouping index 0.
- the UE may report the preferred number of sub-CDM groups among the number of sub-CDM groups within the CDM group to the base station.
- the index of the grouping method preferred by the UE among sub-CDM grouping indices may be reported to the base station.
- the location of the RE to which the RS preferred by the UE is mapped and/or information on the RE to which the RS is mapped may be reported to the base station.
- the subcarrier (or RE) index for the frequency domain set/instructed to the UE is 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, Information on 0, 2, 4, and 6 indicating subcarriers (or REs) preferred by the UE may be reported to the base station.
- the base station sets/instructs the number of sub-CDM groups (eg, sub-CDM grouping index) and/or sub-CDM group index in the CDM group to the terminal based on the report (report value) of the terminal. can do.
- the base station may semi-statically configure the terminal (eg, by RRC / MAC CE), and / or may dynamically indicate (eg, DCI due to).
- a CDM group that is different from a UE that does not support AL/ML/DL implementation Multiplexing is possible based on .
- Embodiment #A2 The 'original DM-RS pattern' defined in the current standard and the 'optimized DM-RS pattern' with lower RS overhead (eg For example, a specific DM-RS pattern among DM-RS patterns exemplified in embodiments #A1 and #A3) may be set/instructed to the UE. And/or rate matching of the sub-CDM group may be set/instructed to the UE.
- the 'original DM-RS pattern' and the 'optimized DM-RS pattern' correspond to one example, and the present disclosure is not limited thereto. That is, the base station may configure/instruct the terminal of a specific DM-RS pattern among the first DM-RS pattern with a relatively higher RS overhead and the second DM-RS pattern with a relatively lower RS overhead. And/or, the base station may set/instruct the terminal whether to rate match the sub-CDM group related to the second DM-RS pattern.
- the second DM-RS pattern For example, a DM-RS is transmitted based on an 'optimized DM-RS pattern'), and in sub-CDM group(s) other than the sub-CDM group(s) to which the DM-RS is transmitted (mapped) Data (eg, PDSCH/PUSCH) may be transmitted.
- the base station instructs the terminal to DM-RS port(s) related to multi-user (MU) transmission (eg, antenna port indication in DCI scheduling PDSCH / PUSCH)
- the second DM-RS pattern eg, sub-CDM group(s) other than the sub-CDM group(s) to which a DM-RS is transmitted based on 'optimized DM-RS pattern' and to which the DM-RS is transmitted (mapped)
- Data eg, PDSCH / PUSCH
- the base station indicates the DM-RS port(s) related to MU transmission to the terminal (eg, an antenna port indication in DCI scheduling PDSCH / PUSCH)
- the first DM-RS pattern eg, DM-RS may be transmitted based on 'original DM-RS pattern').
- the base station indicates the DM-RS port (s) related to SU transmission to the UE (eg, an antenna port indication in DCI scheduling PDSCH / PUSCH)
- the first DM-RS pattern eg For example, DM-RS may be transmitted based on 'original DM-RS pattern').
- data eg, PDSCH/PUSCH
- the base station sets/instructs the terminal to set/instruct the second DM-RS pattern (eg, 'optimized DM-RS pattern')
- data eg, PDSCH/PUSCH
- the number and / or index of sub-CDM groups set eg, by RRC, MAC CE
- instruction eg, by RRC, MAC CE
- data may not be transmitted.
- the DM-RS port (s) related to SU transmission and / or DM-RS port (s) related to MU transmission may be explicitly configured by the base station to the UE.
- DM-RS port(s) related to SU transmission and DM-RS port(s) related to MU transmission may be set for each UE.
- the UE may recognize that the remaining DM-RS ports are related to MU transmission.
- the remaining DM-RS ports may be recognized by the UE as related to SU transmission.
- the UE can implicitly recognize DM-RS port(s) related to SU transmission and/or DM-RS port(s) related to MU transmission. For example, if a specific condition is satisfied, the UE may recognize that the DM-RS port(s) indicated (ie, by PDSCH/PUSCH scheduling DCI) are related to SU transmission or MU transmission. .
- DM-RS port(s) related to SU transmission may correspond to DM-RS antenna port(s) for which SU transmission is guaranteed defined in the current standard as shown in Table 8 below.
- the UE recognizes that it is a DM-RS port (s) related to SU transmission, and The proposed methods of #A2 can be performed, and for other DM-RS antenna port(s), the proposed methods of Example 2 can be performed by recognizing that the other DM-RS port(s) are related to MU transmission.
- Table 8 illustrates the DM-RS antenna port(s) associated with SU transmission currently defined in TS 38.214.
- DM-RS configuration type 1 For DM-RS configuration type 1, - If the UE is scheduled with one codeword and antenna port mapping is assigned to the indexes of ⁇ 2, 9, 10, 11 or 30 ⁇ in Tables 9 and 11, or - If the UE is scheduled with one codeword and the index antenna port mapping of ⁇ 2, 9, 10, 11 or 12 ⁇ in Table 10, ⁇ 2, 9, 10, 11, 30 or 31 ⁇ in Table 12 is assigned, or - If the UE is scheduled with two codewords, The UE may assume that all remaining orthogonal antenna ports are not associated with PDSCH transmission to other UEs.
- DM-RS configuration type 2 For DM-RS configuration type 2, - If the UE is scheduled with one codeword and antenna port mapping is assigned to the indexes of ⁇ 2, 10 or 23 ⁇ in Tables 13 and 15, or - If the UE is scheduled with one codeword and the index antenna port mapping of ⁇ 2, 10, 23 or 24 ⁇ in Table 14 or ⁇ 2, 10, 23 or 58 ⁇ in Table 16 is assigned, or - If the UE is scheduled with two codewords, The UE may assume that all remaining orthogonal antenna ports are not associated with PDSCH transmission to other UEs.
- the second DM-RS pattern eg, 'optimized DMRS pattern'
- the second DM-RS pattern eg, 'optimized DMRS pattern'
- transmitting data eg, PDSCH/PUSCH
- the second DM-RS pattern (eg, 'optimized DMRS pattern') is applied in MU transmission
- rate matching/muting must be performed for DMRS that can be transmitted to other UEs, so throughput from the point of view of the corresponding UE
- RB group A consisting of N or more consecutive RBs among allocated / scheduled (allocated / scheduled) RBs to the UE and RB group B meaning / corresponding to other RBs, in RB group A
- the second DM-RS pattern eg, 'optimized DM-RS pattern'
- the first DM-RS pattern eg, 'original DM-RS pattern'
- the 'N' value in the above proposal may be set/instructed by the base station, and/or the terminal may feedback related information, and/or may be defined as a fixed value. If the N value is defined as a fixed value, the N value may be defined for each numerology such as subcarrier spacing.
- the frequency domain density of the sub-CDM group for the second DM-RS pattern ('optimized DM-RS pattern') can be set/defined. For example, as the value of N increases, since a large number of REs can be used for channel estimation even if the density of the DM-RS is low, as the value of N increases, the frequency domain density of the sub-CDM group may decrease.
- the second DM-RS pattern eg 'optimized DM-RS pattern'
- the first DM-RS pattern eg 'original DM-RS pattern'
- a second DM-RS pattern (eg, 'optimized DM-RS pattern') is applied to a specific frequency domain A
- a first DM-RS pattern (eg, 'optimized DM-RS pattern') is applied to the other frequency domain B.
- original DM-RS pattern') may be applied.
- the 'frequency domain' may be set/instructed by the base station, and/or the terminal may feed back related information, and/or may be defined as a fixed value. If the 'frequency domain' is defined as a fixed value, the 'frequency domain' may be defined for each numerology such as subcarrier spacing.
- the frequency domain density of the sub-CDM group for the second DM-RS pattern (eg, 'optimized DM-RS pattern') is defined based on the value M of the number of allocated/scheduled RBs.
- M the number of allocated/scheduled RBs.
- the sub group index for rate matching may be indicated through the DMRS field of DCI.
- the second DM-RS pattern (eg, 'optimized DM-RS pattern') and the first DM-RS pattern (eg, 'original DM-RS pattern') are based on the size of the allocated/scheduled RB scheduled for the UE.
- RS pattern' may be adaptively applied.
- the 'second DM-RS pattern (eg, 'optimized DM-RS pattern') may be applied, and less than or equal to M case 'and the first DM-RS pattern (eg, 'original DM-RS pattern') may be applied.
- the 'M' value may be set/instructed by the base station, and/or the terminal may feed back related information, and/or may be defined as a fixed value. If the 'M' value is defined as a fixed value, the 'M' value may be defined for each numerology such as subcarrier spacing.
- the frequency domain density of the sub-CDM group may be defined in the 'second DM-RS pattern (eg, 'optimized DM-RS pattern') based on the value M of the number of allocated/scheduled RBs. .
- the frequency domain density of the sub-CDM group can be reduced as the M value is large.
- the DM-RS pattern can be implicitly determined, so the UE's report can be omitted.
- Embodiment #A3 In relation to PDSCH/PUSCH DM-RS, a method for defining/configuring the number of symbols of front-loaded DM-RS and/or the number of symbols of additional DM-RS is proposed.
- the terminal may report the number of additional DM-RS symbols it prefers to the base station.
- the UE may report the preferred number of additional DM-RS symbols to the base station through the capabilities of the UE.
- the terminal may report the number of additional DM-RS symbols it prefers to the base station.
- the base station based on the report (eg, report value) of the terminal, the number of additional DM-RS symbols defined in the existing standard (ie, higher layer parameter dmrs-AdditionalPosition) (hereinafter, the first additional DM- Set the 'optimized additional DM-RS number' (hereinafter referred to as the second additional DM-RS symbol number) to the UE (for example, by RRC, MAC CE)/instruction (eg by DCI).
- the report eg, report value
- the first additional DM- Set the 'optimized additional DM-RS number' hereinafter referred to as the second additional DM-RS symbol number
- the second additional DM-RS symbol number (eg, 'optimized additional DM-RS number') is used to set the existing number of additional DM-RS symbols (ie, the first additional DM-RS symbol number). It may be set (eg, by RRC, MAC CE) / instructed (eg, by DCI) to the terminal using a higher layer parameter (ie, higher layer parameter dmrs-AdditionalPosition) and a different upper layer parameter. . And/or, the second number of additional DM-RS symbols (eg, 'optimized additional DM-RS number') may be defined as a predetermined value fixed between the base station and the terminal.
- the terminal determines the number of the second additional DM-RS symbols (eg, , 'optimized additional DM-RS number'), and when the base station indicates the DM-RS port (s) related to MU transmission to the terminal, the terminal determines the number of the first additional DM-RS symbols (ie, the existing 'Number of additional DM-RS').
- the number of symbols of the front-loaded DM-RS may be defined/configured to be 1.
- TD-OCC time domain-orthogonal cover code
- Setting/instructing front-loaded DM-RS with 2 symbols can be considered to increase the number of MU-pairing UEs based on multiple DM-RS ports.
- the DM-RS port(s) related to SU transmission is indicated to a specific UE, since the UE is not included in the MU-pairing UE, the DM-RS pattern is optimized to lower the RS overhead to increase the throughput from the point of view of the UE. can improve
- Proposal#A3-5 The UE specifies the number of additional DM-RS symbols (eg, the number of first additional DM-RS symbols, the number of second additional DM-RS symbols) and/or DM-RS to the base station.
- TD/FD density eg, number of sub-CDM groups
- time information associated with a specific DM-RS pattern eg, the first DM-RS pattern and the second DM-RS pattern
- the 'time information' is the number of specific additional DM-RSs, and/or specific TD/FD density of DM-RSs, and/or duration information to which a specific DM-RS pattern can be applied (eg, For example, the number of slots, the number of symbols, an absolute time unit, etc.), and/or a start/end point.
- the base station / terminal can predict the optimal DM-RS pattern according to the mobility of the terminal based on the AI / ML / DL algorithm and use the optimal pattern during the corresponding time interval.
- the number of symbols of front-loaded DM-RS and the number of symbols of additional DM-RS are set by parameters that have the same effect on DM-RS patterns that can be set to maxLength and dmrs-AdditionalPosition in the current standard, respectively. It can be.
- Embodiment #A4 By defining a sub-port group in a CDM group, whether to transmit/use an interference port can be set/instructed.
- a plurality of sub-port groups within a single CDM group may be defined/configured.
- a sub-port group consisting of two ports can be defined.
- DM-RS configuration type 1 Config-Type1
- ports 0,1,4,5 can be included in a single CDM group, and ports ⁇ 0,1 ⁇ (or ⁇ 0,4 ⁇ ) It is defined/set as sub-port group #0, and ⁇ 4,5 ⁇ (or ⁇ 1,5 ⁇ ) ports can be defined/set as sub-port group #1, respectively.
- the base station may set/instruct the terminal the sub-port group including the interference port.
- the 'interference port' may mean a port used to transmit data to another terminal.
- the number and/or index of the sub-port group may be set/instructed to the terminal.
- Method(s) in the above-described embodiments #A1/A2/A3/A4 may be applied independently, and/or one or more embodiments (or methods) may be applied in combination.
- 'optimized DM-RS pattern' means a DM-RS pattern in which RS density is adaptively adjusted. can do.
- the 'sub-CDM group' is one of the names / methods referred to to adaptively control the RS density. This is an example and does not limit the methods proposed in this disclosure.
- it may be referred to as time/frequency offset, time/frequency density, and the like. For example, in FIG.
- the frequency density is 3 (ie, 3 DM-RS RE groups exist per 1 RB based on 2 RE units) or 6 (ie, there are 6 DM-RS REs per 1 RB based on 1 RE unit).
- the frequency density is 2 (ie, there are 2 DM-RS RE groups per 1 RB based on 2 RE units) or 4 (ie, , there are 4 DM-RS REs per 1 RB based on 1 RE unit).
- the frequency offset may correspond to 8 subcarriers (or REs).
- a process of reporting related information by the terminal to the base station is included, but the reporting of the terminal is omitted and the base station A method of defining to perform the proposed method alone may also be applied. For example, it is possible to determine whether or not to apply the proposed method based on the information obtained by the base station using information that the base station can acquire by itself, such as uplink reciprocity, without a special report from the terminal. there is. And, based on this, 'optimized DM-RS pattern' can be applied and related information can be set/instructed to the terminal. In this case, it may have a feature that the proposed method can be applied mainly to the AI / ML / DL algorithm of the base station.
- FIG. 10 illustrates a signaling procedure between a base station and a terminal for a DM-RS transmission and reception method according to an embodiment of the present disclosure.
- a UE user equipment
- a signaling procedure between a base station BS
- the example of FIG. 10 is for convenience of description and does not limit the scope of the present disclosure. Some step(s) illustrated in FIG. 10 may be omitted depending on circumstances and/or settings.
- the base station and the terminal in FIG. 10 are just one example, and may be implemented as a device illustrated in FIG. 13 below.
- the processor 102/202 of FIG. 13 may control transmission/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.
- TRPs may be classified according to information (eg, index, ID) on the CORESET group (or CORESET pool). For example, when one UE is configured to transmit/receive with multiple TRPs (or cells), this may mean that multiple CORESET groups (or CORESET pools) are configured for one UE. Configuration of such a CORESET group (or CORESET pool) may be performed through higher layer signaling (eg, RRC signaling, etc.).
- 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.
- the terminal receives configuration information related to the DM-RS from the base station (S1001). That is, the base station transmits configuration information related to the DM-RS to the terminal.
- the DM-RS-related setting information is based on the previously proposed method (eg, any one of embodiments #A1, A2, A3, and A4 and detailed embodiments thereof, or a combination of one or more (specific) embodiments). It may include information for setting the based operation.
- the DM-RS related configuration information is any one or both of downlink DM-RS configuration information (eg, DMRS-DownlinkConfig IE) and uplink DM-RS configuration information (eg, DMRS-UplinkConfig IE) may correspond to
- the DM-RS related configuration information may include a DM-RS configuration type (eg, configuration type 1 or 2), additional DM-RS location, maximum length, scrambling ID, and the like.
- a DM-RS configuration type eg, configuration type 1 or 2
- additional DM-RS location e.g., maximum length, scrambling ID, and the like.
- the DM-RS related configuration information is information for defining/configuring a Sub-CDM group (eg, the number of REs in a Sub-CDM group (RE group), within a CDM group).
- a Sub-CDM group eg, the number of REs in a Sub-CDM group (RE group), within a CDM group.
- the number of sub-CDM groups when a sub-CDM group is repeated in a specific PRB unit, the number of specific PRBs, setting information for a plurality of grouping methods with different numbers of sub-CDMs, the sub-CDM grouping index, etc.) can do.
- the DM-RS related configuration information may include information for configuring a DM-RS pattern.
- the DM-RS-related setting information includes i) information for configuring a first DM-RS pattern (eg, legacy DM-RS) and ii) a frequency domain (and/or Alternatively, information for setting a second DMRS pattern having a smaller density in the time domain) may be included.
- the DM-RS-related setting information is information necessary for determining which pattern to apply among the first DM-RS pattern and the second DM-RS pattern (eg, DM-RS port(s) related to MU transmission) , DM-RS port(s) related to SU transmission, number of consecutive scheduled/allocated RBs, DM-RS pattern applied for each frequency domain, size of scheduled/allocated RBs, etc.).
- the first DM-RS pattern may correspond to a pattern mapped/transmitted in an existing CDM group
- the second DM-RS pattern may correspond to a pattern mapped/transmitted in a Sub-CDM group within an existing single CDM group. It may correspond to a transmitted pattern.
- the DM-RS related configuration information may include information on the number of front-loaded DM-RS symbols, the number of additional DM-RS symbols, and the like. .
- the DM-RS related setting information may include information for defining/configuring a sub-port group, information on an interference port, and the like.
- the terminal receives downlink control information (DCI) for scheduling the PDSCH or PUSCH from the base station (S1002). That is, the base station transmits downlink control information (DCI) for scheduling PDSCH or PUSCH to the terminal.
- DCI downlink control information
- DCI may be transmitted through PDCCH.
- the DCI may include time/frequency resource information allocated/scheduled for transmission of the PDSCH or PUSCH, and information on one or more antenna ports.
- One or more antenna ports for PDSCH or PUSCH transmission may be equally applied for DM-RS transmission.
- DCI is a Sub-RS for transmission and reception of PDSCH or PUSCH scheduled by DCI. It may also include a CDM grouping index.
- the terminal receives the PDSCH and the DM-RS for the PDSCH from the base station based on the DCI, or transmits the PUSCH and the DM-RS for the PUSCH to the base station based on the DCI (S1003). That is, the base station transmits the PDSCH and the DM-RS for the PDSCH to the terminal based on the DCI, or receives the PUSCH and the DM-RS for the PUSCH from the terminal based on the DCI.
- the DM-RS may be transmitted and received in a predetermined pattern based on information previously set in DM-RS-related configuration information (or information additionally indicated by DCI) within the PDCSH/PUSCH transmission and reception area.
- the first DM-RS pattern and Among the second DM-RS patterns may be determined. For example, when the one or more antenna ports indicated by the DCI are associated with SU transmission, the DM-RS pattern may be determined as the first DM-RS pattern. As another example, when the one or more antenna ports indicated by the DCI are related to MU transmission, the DM-RS pattern may be determined as the second DM-RS pattern.
- specific antenna port(s) may be predefined as related to SU transmission (eg, specified in the standard), and other than predefined antenna port(s) may be considered related to MU transmission.
- the first DM-RS pattern eg, legacy DM-RS
- the second DM-RS pattern correspond to patterns having different densities in the frequency domain (and/or time domain). do.
- the second DM-RS pattern has less density in the frequency domain (and/or time domain) than the first DM-RS pattern.
- the second DM-RS pattern is based on a specific sub-CDM group among a plurality of sub-CDM groups defined in a single code division multiplexing (CDM) group for the first DM-RS pattern.
- CDM code division multiplexing
- a DM-RS can be mapped to REs belonging to a single CDM group
- a DM-RS is defined within the single CDM group.
- the plurality of sub-CDM groups may be defined as a unit to which a frequency domain-orthogonal cover code (FD-OCC) is applied within the single CDM group. That is, one unit to which FD-OCC is applied may correspond to one sub-CDM group.
- FD-OCC frequency domain-orthogonal cover code
- a plurality of grouping schemes having different numbers of sub-CDM groups are defined within the single CDM group, and the second DM-RS pattern is set/instructed as one of the plurality of grouping schemes. (e.g., by sub-CDM grouping index).
- the plurality of sub-CDM groups may be repeated in a specific physical resource block (PRB) unit (eg, two PRBs) in the frequency domain.
- PRB physical resource block
- the sub- The PDSCH or the PUSCH may be transmitted to one or more sub-CDM groups other than the CDM group.
- the sub- The PDSCH or the PUSCH may not be transmitted to one or more sub-CDM groups other than the CDM group.
- the terminal transmits information on i) intervals to which the first DM-RS pattern or the second DM-RS pattern can be applied and/or ii) information on start and end points to the base station. can report to In addition, the UE reports the number of specific additional DM-RSs and/or the density (eg, the number of sub-CDM groups) of supportable (or preferred) DM-RSs in the time/frequency domain to the base station. can do.
- the base station may configure an optimal DM-RS pattern for the terminal based on the information reported from the terminal.
- FIG. 11 illustrates an operation of a terminal for a DM-RS transmission/reception method according to an embodiment of the present disclosure.
- FIG. 11 illustrates an operation of a terminal based on the previously proposed method (eg, any one of embodiments #A1, A2, A3, and A4 and detailed embodiments thereof, or a combination of one or more (detailed) embodiments) do.
- the example of FIG. 11 is for convenience of description and does not limit the scope of the present disclosure. Some step(s) illustrated in FIG. 11 may be omitted depending on circumstances and/or settings.
- the terminal in FIG. 11 is only one example, and may be implemented as a device illustrated in FIG. 13 below.
- the processor 102/202 of FIG. 13 uses the transceiver 106/206 to perform channel/signal/data/information, etc. (eg, RRC signaling, MAC CE, UL/DL scheduling).
- DCI, SS / PBCH block, CSI-RS, SRS, DM-RS, PDCCH, PDSCH, PUSCH, PUCCH, etc. can be controlled to transmit and receive, and transmitted or received channels / signals / data / information, etc. 104/204).
- the terminal receives configuration information related to the DM-RS from the base station (S1101).
- the DM-RS-related setting information is based on the previously proposed method (eg, any one of embodiments #A1, A2, A3, and A4 and detailed embodiments thereof, or a combination of one or more (specific) embodiments). It may include information for setting the based operation.
- the DM-RS related configuration information is any one or both of downlink DM-RS configuration information (eg, DMRS-DownlinkConfig IE) and uplink DM-RS configuration information (eg, DMRS-UplinkConfig IE) may correspond to
- the DM-RS related configuration information may include a DM-RS configuration type (eg, configuration type 1 or 2), additional DM-RS location, maximum length, scrambling ID, and the like.
- a DM-RS configuration type eg, configuration type 1 or 2
- additional DM-RS location e.g., maximum length, scrambling ID, and the like.
- the DM-RS related configuration information is information for defining/configuring a Sub-CDM group (eg, the number of REs in a Sub-CDM group (RE group), within a CDM group).
- a Sub-CDM group eg, the number of REs in a Sub-CDM group (RE group), within a CDM group.
- the number of sub-CDM groups when a sub-CDM group is repeated in a specific PRB unit, the number of specific PRBs, setting information for a plurality of grouping methods with different numbers of sub-CDMs, the sub-CDM grouping index, etc.) can do.
- the DM-RS related configuration information may include information for configuring a DM-RS pattern.
- the DM-RS-related setting information includes i) information for configuring a first DM-RS pattern (eg, legacy DM-RS) and ii) a frequency domain (and/or Alternatively, information for setting a second DMRS pattern having a smaller density in the time domain) may be included.
- the DM-RS-related setting information is information necessary for determining which pattern to apply among the first DM-RS pattern and the second DM-RS pattern (eg, DM-RS port(s) related to MU transmission) , DM-RS port(s) related to SU transmission, number of consecutive scheduled/allocated RBs, DM-RS pattern applied for each frequency domain, size of scheduled/allocated RBs, etc.).
- the first DM-RS pattern may correspond to a pattern mapped/transmitted in an existing CDM group
- the second DM-RS pattern may correspond to a pattern mapped/transmitted in a Sub-CDM group within an existing single CDM group. It may correspond to a transmitted pattern.
- the DM-RS related configuration information may include information on the number of front-loaded DM-RS symbols, the number of additional DM-RS symbols, and the like. .
- the DM-RS related setting information may include information for defining/configuring a sub-port group, information on an interference port, and the like.
- the terminal receives downlink control information (DCI) for scheduling the PDSCH or PUSCH from the base station (S1102).
- DCI downlink control information
- DCI may be transmitted through PDCCH.
- the DCI may include time/frequency resource information allocated/scheduled for transmission of the PDSCH or PUSCH, and information on one or more antenna ports.
- One or more antenna ports for PDSCH or PUSCH transmission may be equally applied for DM-RS transmission.
- DCI is a Sub-RS for transmission and reception of PDSCH or PUSCH scheduled by DCI. It may also include a CDM grouping index.
- the terminal receives the PDSCH and the DM-RS for the PDSCH from the base station based on the DCI, or transmits the PUSCH and the DM-RS for the PUSCH to the base station based on the DCI (S1103).
- the DM-RS may be transmitted and received in a predetermined pattern based on DM-RS-related configuration information (or information additionally indicated by DCI) within the PDCSH/PUSCH transmission and reception area.
- the first DM-RS pattern and Among the second DM-RS patterns may be determined. For example, when the one or more antenna ports indicated by the DCI are associated with SU transmission, the DM-RS pattern may be determined as the first DM-RS pattern. As another example, when the one or more antenna ports indicated by the DCI are related to MU transmission, the DM-RS pattern may be determined as the second DM-RS pattern.
- specific antenna port(s) may be predefined as related to SU transmission (eg, specified in the standard), and other than predefined antenna port(s) may be considered related to MU transmission.
- the first DM-RS pattern eg, legacy DM-RS
- the second DM-RS pattern correspond to patterns having different densities in the frequency domain (and/or time domain). do.
- the second DM-RS pattern has less density in the frequency domain (and/or time domain) than the first DM-RS pattern.
- the second DM-RS pattern is based on a specific sub-CDM group among a plurality of sub-CDM groups defined in a single code division multiplexing (CDM) group for the first DM-RS pattern.
- CDM code division multiplexing
- a DM-RS can be mapped to REs belonging to a single CDM group
- a DM-RS is defined within the single CDM group.
- the plurality of sub-CDM groups may be defined as a unit to which a frequency domain-orthogonal cover code (FD-OCC) is applied within the single CDM group. That is, one unit to which FD-OCC is applied may correspond to one sub-CDM group.
- FD-OCC frequency domain-orthogonal cover code
- a plurality of grouping schemes having different numbers of sub-CDM groups are defined within the single CDM group, and the second DM-RS pattern is set/instructed as one of the plurality of grouping schemes. (e.g., by sub-CDM grouping index).
- the plurality of sub-CDM groups may be repeated in a specific physical resource block (PRB) unit (eg, two PRBs) in the frequency domain.
- PRB physical resource block
- the sub- The PDSCH or the PUSCH may be transmitted to one or more sub-CDM groups other than the CDM group.
- the sub- The PDSCH or the PUSCH may not be transmitted to one or more sub-CDM groups other than the CDM group.
- the terminal reports information on i) intervals to which the first DM-RS pattern or the second DM-RS pattern can be applied and / or ii) information on start and end points to the base station can do.
- the UE may also report the number of specific additional DM-RSs and/or the density (eg, the number of sub-CDM groups) of supportable (or preferred) DM-RSs in the time/frequency domain to the base station. there is.
- FIG. 12 illustrates an operation of a base station for a DM-RS transmission/reception method according to an embodiment of the present disclosure.
- FIG. 12 illustrates an operation of a terminal based on the method proposed above (eg, any one of embodiments #A1, A2, A3, and A4 and detailed embodiments thereof, or a combination of one or more (detailed) embodiments) do.
- the example of FIG. 12 is for convenience of explanation and does not limit the scope of the present disclosure. Some step(s) illustrated in FIG. 12 may be omitted depending on circumstances and/or settings.
- the base station in FIG. 12 is only one example, and may be implemented as a device illustrated in FIG. 13 below.
- the processor 102/202 of FIG. 13 uses the transceiver 106/206 to perform channel/signal/data/information, etc. (eg, RRC signaling, MAC CE, UL/DL scheduling).
- DCI, SS / PBCH block, CSI-RS, SRS, DM-RS, PDCCH, PDSCH, PUSCH, PUCCH, etc. can be controlled to transmit and receive, and transmitted or received channels / signals / data / information, etc. 104/204).
- the base station transmits configuration information related to DM-RS to the terminal (S1201).
- the DM-RS-related setting information is based on the previously proposed method (eg, any one of embodiments #A1, A2, A3, and A4 and detailed embodiments thereof, or a combination of one or more (specific) embodiments). It may include information for setting the based operation.
- the DM-RS related configuration information is any one or both of downlink DM-RS configuration information (eg, DMRS-DownlinkConfig IE) and uplink DM-RS configuration information (eg, DMRS-UplinkConfig IE) may correspond to
- the DM-RS related configuration information may include a DM-RS configuration type (eg, configuration type 1 or 2), additional DM-RS location, maximum length, scrambling ID, and the like.
- a DM-RS configuration type eg, configuration type 1 or 2
- additional DM-RS location e.g., maximum length, scrambling ID, and the like.
- the DM-RS related configuration information is information for defining/configuring a Sub-CDM group (eg, the number of REs in a Sub-CDM group (RE group), within a CDM group).
- a Sub-CDM group eg, the number of REs in a Sub-CDM group (RE group), within a CDM group.
- the number of sub-CDM groups when a sub-CDM group is repeated in a specific PRB unit, the number of specific PRBs, setting information for a plurality of grouping methods with different numbers of sub-CDMs, the sub-CDM grouping index, etc.) can do.
- the DM-RS related configuration information may include information for configuring a DM-RS pattern.
- the DM-RS-related setting information includes i) information for configuring a first DM-RS pattern (eg, legacy DM-RS) and ii) a frequency domain (and/or Alternatively, information for setting a second DMRS pattern having a smaller density in the time domain) may be included.
- the DM-RS-related setting information is information necessary for determining which pattern to apply among the first DM-RS pattern and the second DM-RS pattern (eg, DM-RS port(s) related to MU transmission) , DM-RS port(s) related to SU transmission, number of consecutive scheduled/allocated RBs, DM-RS pattern applied for each frequency domain, size of scheduled/allocated RBs, etc.).
- the first DM-RS pattern may correspond to a pattern mapped/transmitted in an existing CDM group
- the second DM-RS pattern may correspond to a pattern mapped/transmitted in a Sub-CDM group within an existing single CDM group. It may correspond to a transmitted pattern.
- the DM-RS related configuration information may include information on the number of front-loaded DM-RS symbols, the number of additional DM-RS symbols, and the like. .
- the DM-RS related setting information may include information for defining/configuring a sub-port group, information on an interference port, and the like.
- the base station transmits downlink control information (DCI) for scheduling PDSCH or PUSCH to the terminal (S1202).
- DCI downlink control information
- DCI may be transmitted through PDCCH.
- the DCI may include time/frequency resource information allocated/scheduled for transmission of the PDSCH or PUSCH, and information on one or more antenna ports.
- One or more antenna ports for PDSCH or PUSCH transmission may be equally applied for DM-RS transmission.
- DCI is a Sub-RS for transmission and reception of PDSCH or PUSCH scheduled by DCI. It may also include a CDM grouping index.
- the base station transmits the PDSCH and the DM-RS for the PDSCH to the terminal based on the DCI, or receives the PUSCH and the DM-RS for the PUSCH from the terminal based on the DCI (S1203).
- the DM-RS may be transmitted and received in a predetermined pattern based on DM-RS-related configuration information (or information additionally indicated by DCI) within the PDCSH/PUSCH transmission and reception area.
- the first DM-RS pattern and Among the second DM-RS patterns may be determined. For example, when the one or more antenna ports indicated by the DCI are associated with SU transmission, the DM-RS pattern may be determined as the first DM-RS pattern. As another example, when the one or more antenna ports indicated by the DCI are related to MU transmission, the DM-RS pattern may be determined as the second DM-RS pattern.
- specific antenna port(s) may be predefined as related to SU transmission (eg, specified in the standard), and other than predefined antenna port(s) may be considered related to MU transmission.
- the first DM-RS pattern eg, legacy DM-RS
- the second DM-RS pattern correspond to patterns having different densities in the frequency domain (and/or time domain). do.
- the second DM-RS pattern has less density in the frequency domain (and/or time domain) than the first DM-RS pattern.
- the second DM-RS pattern is based on a specific sub-CDM group among a plurality of sub-CDM groups defined in a single code division multiplexing (CDM) group for the first DM-RS pattern.
- CDM code division multiplexing
- a DM-RS can be mapped to REs belonging to a single CDM group
- a DM-RS is defined within the single CDM group.
- the plurality of sub-CDM groups may be defined as a unit to which a frequency domain-orthogonal cover code (FD-OCC) is applied within the single CDM group. That is, one unit to which FD-OCC is applied may correspond to one sub-CDM group.
- FD-OCC frequency domain-orthogonal cover code
- a plurality of grouping schemes having different numbers of sub-CDM groups are defined within the single CDM group, and the second DM-RS pattern is set/instructed as one of the plurality of grouping schemes. (e.g., by sub-CDM grouping index).
- the plurality of sub-CDM groups may be repeated in a specific physical resource block (PRB) unit (eg, two PRBs) in the frequency domain.
- PRB physical resource block
- the sub- The PDSCH or the PUSCH may be transmitted to one or more sub-CDM groups other than the CDM group.
- the sub- The PDSCH or the PUSCH may not be transmitted to one or more sub-CDM groups other than the CDM group.
- the base station receives information about i) intervals to which the first DM-RS pattern or the second DM-RS pattern can be applied from the terminal and / or ii) information about start and end points can do.
- the base station may receive the number of specific additional DM-RSs and/or the density (eg, the number of sub-CDM groups) of supportable (or preferred) DM-RSs in the time/frequency domain from the terminal. there is.
- the base station may set an optimal DM-RS pattern for the corresponding terminal based on (or considering) information received from the terminal.
- FIG. 13 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 |
-- ASN1START -- TAG-DMRS-DOWNLINKCONFIG-START DMRS-DownlinkConfig ::= SEQUENCE { dmrs-Type ENUMERATED {type2} OPTIONAL, -- Need S dmrs-AdditionalPosition ENUMERATED {pos0, pos1, pos3} OPTIONAL, -- Need S maxLength ENUMERATED {len2} OPTIONAL, -- Need S scramblingID0 INTEGER (0..65535) OPTIONAL, -- Need S scramblingID1 INTEGER (0..65535) OPTIONAL, -- Need S phaseTrackingRS SetupRelease { PTRS-DownlinkConfig } OPTIONAL, -- Need M ... } -- TAG-DMRS-DOWNLINKCONFIG-STOP -- ASN1STOP |
-- ASN1START -- TAG-DMRS-UPLINKCONFIG-START DMRS-UplinkConfig ::= SEQUENCE { dmrs-Type ENUMERATED {type2} OPTIONAL, -- Need S dmrs-AdditionalPosition ENUMERATED {pos0, pos1, pos3} OPTIONAL, -- Need S phaseTrackingRS SetupRelease { PTRS-UplinkConfig } OPTIONAL, -- Need M maxLength ENUMERATED {len2} OPTIONAL, -- Need S transformPrecodingDisabled SEQUENCE { scramblingID0 INTEGER (0..65535) OPTIONAL, -- Need S scramblingID1 INTEGER (0..65535) OPTIONAL, -- Need S ... } OPTIONAL, -- Need R transformPrecodingEnabled SEQUENCE { nPUSCH-Identity INTEGER(0..1007) OPTIONAL, -- Need S sequenceGroupHopping ENUMERATED {disabled} OPTIONAL, -- Need S sequenceHopping ENUMERATED {enabled} OPTIONAL, -- Need S ... } OPTIONAL, -- Need R ... } -- TAG-DMRS-UPLINKCONFIG-STOP -- ASN1STO |
DM-RS 설정 타입 1에 대해서, - UE가 하나의 코드워드(codeword)로 스케줄링되고 표 9 및 표 11 내 {2, 9, 10, 11 또는 30}의 인덱스들로 안테나 포트 매핑이 할당(assign)되면, 또는 - UE가 하나의 codeword로 스케줄링되고 표 10 내 {2, 9, 10, 11 또는 12}, 표 12 내 {2, 9, 10, 11, 30 또는 31}의 인덱스 안테나 포트 매핑이 assign되면, 또는 - UE가 2개의 codeword로 스케줄링되면, UE는 모든 나머지 직교 안테나 포트들은 다른 UE로의 PDSCH 전송과 연관되지 않는다고 가정할 수 있다. DM-RS 설정 타입 2에 대해서, - UE가 하나의 코드워드(codeword)로 스케줄링되고 표 13 및 표 15 내 {2, 10 또는 23}의 인덱스들로 안테나 포트 매핑이 할당(assign)되면, 또는 - UE가 하나의 codeword로 스케줄링되고 표 14 내 {2, 10, 23 또는 24}, 표 16 내 {2, 10, 23 또는 58}의 인덱스 안테나 포트 매핑이 assign되면, 또는 - UE가 2개의 codeword로 스케줄링되면, UE는 모든 나머지 직교 안테나 포트들은 다른 UE로의 PDSCH 전송과 연관되지 않는다고 가정할 수 있다. |
하나의 Codeword: Codeword 0 이네이블(enabled), Codeword 1 디스에이블(disabled) |
||
값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) |
0 | 1 | 0 |
1 | 1 | 1 |
2 | 1 | 0,1 |
3 | 2 | 0 |
4 | 2 | 1 |
5 | 2 | 2 |
6 | 2 | 3 |
7 | 2 | 0,1 |
8 | 2 | 2,3 |
9 | 2 | 0-2 |
10 | 2 | 0-3 |
11 | 2 | 0,2 |
12-15 | Reserved | Reserved |
하나의 Codeword: Codeword 0 enabled, Codeword 1 disabled |
||
값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) |
0 | 1 | 0 |
1 | 1 | 1 |
2 | 1 | 0,1 |
3 | 2 | 0 |
4 | 2 | 1 |
5 | 2 | 2 |
6 | 2 | 3 |
7 | 2 | 0,1 |
8 | 2 | 2,3 |
9 | 2 | 0-2 |
10 | 2 | 0-3 |
11 | 2 | 0,2 |
12 | 2 | 0,2,3 |
13-15 | Reserved | Reserved |
하나의 Codeword: Codeword 0 enabled, Codeword 1 disabled |
두개의 Codewords: Codeword 0 enabled, Codeword 1 enabled |
||||||
값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | front-load 심볼들의 개수 | 값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | front-load 심볼들의 개수 |
0 | 1 | 0 | 1 | 0 | 2 | 0-4 | 2 |
1 | 1 | 1 | 1 | 1 | 2 | 0,1,2,3,4,6 | 2 |
2 | 1 | 0,1 | 1 | 2 | 2 | 0,1,2,3,4,5,6 | 2 |
3 | 2 | 0 | 1 | 3 | 2 | 0,1,2,3,4,5,6,7 | 2 |
4 | 2 | 1 | 1 | 4-31 | reserved | reserved | reserved |
5 | 2 | 2 | 1 | ||||
6 | 2 | 3 | 1 | ||||
7 | 2 | 0,1 | 1 | ||||
8 | 2 | 2,3 | 1 | ||||
9 | 2 | 0-2 | 1 | ||||
10 | 2 | 0-3 | 1 | ||||
11 | 2 | 0,2 | 1 | ||||
12 | 2 | 0 | 2 | ||||
13 | 2 | 1 | 2 | ||||
14 | 2 | 2 | 2 | ||||
15 | 2 | 3 | 2 | ||||
16 | 2 | 4 | 2 | ||||
17 | 2 | 5 | 2 | ||||
18 | 2 | 6 | 2 | ||||
19 | 2 | 7 | 2 | ||||
20 | 2 | 0,1 | 2 | ||||
21 | 2 | 2,3 | 2 | ||||
22 | 2 | 4,5 | 2 | ||||
23 | 2 | 6,7 | 2 | ||||
24 | 2 | 0,4 | 2 | ||||
25 | 2 | 2,6 | 2 | ||||
26 | 2 | 0,1,4 | 2 | ||||
27 | 2 | 2,3,6 | 2 | ||||
28 | 2 | 0,1,4,5 | 2 | ||||
29 | 2 | 2,3,6,7 | 2 | ||||
30 | 2 | 0,2,4,6 | 2 | ||||
31 | Reserved | Reserved | Reserved |
하나의 Codeword: Codeword 0 enabled, Codeword 1 disabled |
두개의 Codewords: Codeword 0 enabled, Codeword 1 enabled |
||||||
값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | front-load 심볼들의 개수 | 값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | front-load 심볼들의 개수 |
0 | 1 | 0 | 1 | 0 | 2 | 0-4 | 2 |
1 | 1 | 1 | 1 | 1 | 2 | 0,1,2,3,4,6 | 2 |
2 | 1 | 0,1 | 1 | 2 | 2 | 0,1,2,3,4,5,6 | 2 |
3 | 2 | 0 | 1 | 3 | 2 | 0,1,2,3,4,5,6,7 | 2 |
4 | 2 | 1 | 1 | 4-31 | reserved | reserved | reserved |
5 | 2 | 2 | 1 | ||||
6 | 2 | 3 | 1 | ||||
7 | 2 | 0,1 | 1 | ||||
8 | 2 | 2,3 | 1 | ||||
9 | 2 | 0-2 | 1 | ||||
10 | 2 | 0-3 | 1 | ||||
11 | 2 | 0,2 | 1 | ||||
12 | 2 | 0 | 2 | ||||
13 | 2 | 1 | 2 | ||||
14 | 2 | 2 | 2 | ||||
15 | 2 | 3 | 2 | ||||
16 | 2 | 4 | 2 | ||||
17 | 2 | 5 | 2 | ||||
18 | 2 | 6 | 2 | ||||
19 | 2 | 7 | 2 | ||||
20 | 2 | 0,1 | 2 | ||||
21 | 2 | 2,3 | 2 | ||||
22 | 2 | 4,5 | 2 | ||||
23 | 2 | 6,7 | 2 | ||||
24 | 2 | 0,4 | 2 | ||||
25 | 2 | 2,6 | 2 | ||||
26 | 2 | 0,1,4 | 2 | ||||
27 | 2 | 2,3,6 | 2 | ||||
28 | 2 | 0,1,4,5 | 2 | ||||
29 | 2 | 2,3,6,7 | 2 | ||||
30 | 2 | 0,2,4,6 | 2 | ||||
31 | 2 | 0,2,3 | 1 |
하나의 Codeword: Codeword 0 enabled, Codeword 1 disabled |
두개의 Codewords: Codeword 0 enabled, Codeword 1 enabled |
||||
값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | 값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) |
0 | 1 | 0 | 0 | 3 | 0-4 |
1 | 1 | 1 | 1 | 3 | 0-5 |
2 | 1 | 0,1 | 2-31 | reserved | reserved |
3 | 2 | 0 | |||
4 | 2 | 1 | |||
5 | 2 | 2 | |||
6 | 2 | 3 | |||
7 | 2 | 0,1 | |||
8 | 2 | 2,3 | |||
9 | 2 | 0-2 | |||
10 | 2 | 0-3 | |||
11 | 3 | 0 | |||
12 | 3 | 1 | |||
13 | 3 | 2 | |||
14 | 3 | 3 | |||
15 | 3 | 4 | |||
16 | 3 | 5 | |||
17 | 3 | 0,1 | |||
18 | 3 | 2,3 | |||
19 | 3 | 4,5 | |||
20 | 3 | 0-2 | |||
21 | 3 | 3-5 | |||
22 | 3 | 0-3 | |||
23 | 2 | 0,2 | |||
24-31 | Reserved | Reserved |
하나의 Codeword: Codeword 0 enabled, Codeword 1 disabled |
두개의 Codewords: Codeword 0 enabled, Codeword 1 enabled |
||||
값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | 값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) |
0 | 1 | 0 | 0 | 3 | 0-4 |
1 | 1 | 1 | 1 | 3 | 0-5 |
2 | 1 | 0,1 | 2-31 | reserved | reserved |
3 | 2 | 0 | |||
4 | 2 | 1 | |||
5 | 2 | 2 | |||
6 | 2 | 3 | |||
7 | 2 | 0,1 | |||
8 | 2 | 2,3 | |||
9 | 2 | 0-2 | |||
10 | 2 | 0-3 | |||
11 | 3 | 0 | |||
12 | 3 | 1 | |||
13 | 3 | 2 | |||
14 | 3 | 3 | |||
15 | 3 | 4 | |||
16 | 3 | 5 | |||
17 | 3 | 0,1 | |||
18 | 3 | 2,3 | |||
19 | 3 | 4,5 | |||
20 | 3 | 0-2 | |||
21 | 3 | 3-5 | |||
22 | 3 | 0-3 | |||
23 | 2 | 0,2 | |||
24 | 2 | 0,2,3 | |||
25-31 | Reserved | Reserved |
하나의 Codeword: Codeword 0 enabled, Codeword 1 disabled |
두개의 Codewords: Codeword 0 enabled, Codeword 1 enabled |
||||||
값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | front-load 심볼들의 개수 | 값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | front-load 심볼들의 개수 |
0 | 1 | 0 | 1 | 0 | 3 | 0-4 | 1 |
1 | 1 | 1 | 1 | 1 | 3 | 0-5 | 1 |
2 | 1 | 0,1 | 1 | 2 | 2 | 0,1,2,3,6 | 2 |
3 | 2 | 0 | 1 | 3 | 2 | 0,1,2,3,6,8 | 2 |
4 | 2 | 1 | 1 | 4 | 2 | 0,1,2,3,6,7,8 | 2 |
5 | 2 | 2 | 1 | 5 | 2 | 0,1,2,3,6,7,8,9 | 2 |
6 | 2 | 3 | 1 | 6-63 | Reserved | Reserved | Reserved |
7 | 2 | 0,1 | 1 | ||||
8 | 2 | 2,3 | 1 | ||||
9 | 2 | 0-2 | 1 | ||||
10 | 2 | 0-3 | 1 | ||||
11 | 3 | 0 | 1 | ||||
12 | 3 | 1 | 1 | ||||
13 | 3 | 2 | 1 | ||||
14 | 3 | 3 | 1 | ||||
15 | 3 | 4 | 1 | ||||
16 | 3 | 5 | 1 | ||||
17 | 3 | 0,1 | 1 | ||||
18 | 3 | 2,3 | 1 | ||||
19 | 3 | 4,5 | 1 | ||||
20 | 3 | 0-2 | 1 | ||||
21 | 3 | 3-5 | 1 | ||||
22 | 3 | 0-3 | 1 | ||||
23 | 2 | 0,2 | 1 | ||||
24 | 3 | 0 | 2 | ||||
25 | 3 | 1 | 2 | ||||
26 | 3 | 2 | 2 | ||||
27 | 3 | 3 | 2 | ||||
28 | 3 | 4 | 2 | ||||
29 | 3 | 5 | 2 | ||||
30 | 3 | 6 | 2 | ||||
31 | 3 | 7 | 2 | ||||
32 | 3 | 8 | 2 | ||||
33 | 3 | 9 | 2 | ||||
34 | 3 | 10 | 2 | ||||
35 | 3 | 11 | 2 | ||||
36 | 3 | 0,1 | 2 | ||||
37 | 3 | 2,3 | 2 | ||||
38 | 3 | 4,5 | 2 | ||||
39 | 3 | 6,7 | 2 | ||||
40 | 3 | 8,9 | 2 | ||||
41 | 3 | 10,11 | 2 | ||||
42 | 3 | 0,1,6 | 2 | ||||
43 | 3 | 2,3,8 | 2 | ||||
44 | 3 | 4,5,10 | 2 | ||||
45 | 3 | 0,1,6,7 | 2 | ||||
46 | 3 | 2,3,8,9 | 2 | ||||
47 | 3 | 4,5,10,11 | 2 | ||||
48 | 1 | 0 | 2 | ||||
49 | 1 | 1 | 2 | ||||
50 | 1 | 6 | 2 | ||||
51 | 1 | 7 | 2 | ||||
52 | 1 | 0,1 | 2 | ||||
53 | 1 | 6,7 | 2 | ||||
54 | 2 | 0,1 | 2 | ||||
55 | 2 | 2,3 | 2 | ||||
56 | 2 | 6,7 | 2 | ||||
57 | 2 | 8,9 | 2 | ||||
58-63 | Reserved | Reserved | Reserved |
하나의 Codeword: Codeword 0 enabled, Codeword 1 disabled |
두개의 Codewords: Codeword 0 enabled, Codeword 1 enabled |
||||||
값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | front-load 심볼들의 개수 | 값 | 데이터 없는 DMRS CDM 그룹(들)의 개수 | DMRS 포트(들) | front-load 심볼들의 개수 |
0 | 1 | 0 | 1 | 0 | 3 | 0-4 | 1 |
1 | 1 | 1 | 1 | 1 | 3 | 0-5 | 1 |
2 | 1 | 0,1 | 1 | 2 | 2 | 0,1,2,3,6 | 2 |
3 | 2 | 0 | 1 | 3 | 2 | 0,1,2,3,6,8 | 2 |
4 | 2 | 1 | 1 | 4 | 2 | 0,1,2,3,6,7,8 | 2 |
5 | 2 | 2 | 1 | 5 | 2 | 0,1,2,3,6,7,8,9 | 2 |
6 | 2 | 3 | 1 | 6-63 | Reserved | Reserved | Reserved |
7 | 2 | 0,1 | 1 | ||||
8 | 2 | 2,3 | 1 | ||||
9 | 2 | 0-2 | 1 | ||||
10 | 2 | 0-3 | 1 | ||||
11 | 3 | 0 | 1 | ||||
12 | 3 | 1 | 1 | ||||
13 | 3 | 2 | 1 | ||||
14 | 3 | 3 | 1 | ||||
15 | 3 | 4 | 1 | ||||
16 | 3 | 5 | 1 | ||||
17 | 3 | 0,1 | 1 | ||||
18 | 3 | 2,3 | 1 | ||||
19 | 3 | 4,5 | 1 | ||||
20 | 3 | 0-2 | 1 | ||||
21 | 3 | 3-5 | 1 | ||||
22 | 3 | 0-3 | 1 | ||||
23 | 2 | 0,2 | 1 | ||||
24 | 3 | 0 | 2 | ||||
25 | 3 | 1 | 2 | ||||
26 | 3 | 2 | 2 | ||||
27 | 3 | 3 | 2 | ||||
28 | 3 | 4 | 2 | ||||
29 | 3 | 5 | 2 | ||||
30 | 3 | 6 | 2 | ||||
31 | 3 | 7 | 2 | ||||
32 | 3 | 8 | 2 | ||||
33 | 3 | 9 | 2 | ||||
34 | 3 | 10 | 2 | ||||
35 | 3 | 11 | 2 | ||||
36 | 3 | 0,1 | 2 | ||||
37 | 3 | 2,3 | 2 | ||||
38 | 3 | 4,5 | 2 | ||||
39 | 3 | 6,7 | 2 | ||||
40 | 3 | 8,9 | 2 | ||||
41 | 3 | 10,11 | 2 | ||||
42 | 3 | 0,1,6 | 2 | ||||
43 | 3 | 2,3,8 | 2 | ||||
44 | 3 | 4,5,10 | 2 | ||||
45 | 3 | 0,1,6,7 | 2 | ||||
46 | 3 | 2,3,8,9 | 2 | ||||
47 | 3 | 4,5,10,11 | 2 | ||||
48 | 1 | 0 | 2 | ||||
49 | 1 | 1 | 2 | ||||
50 | 1 | 6 | 2 | ||||
51 | 1 | 7 | 2 | ||||
52 | 1 | 0,1 | 2 | ||||
53 | 1 | 6,7 | 2 | ||||
54 | 2 | 0,1 | 2 | ||||
55 | 2 | 2,3 | 2 | ||||
56 | 2 | 6,7 | 2 | ||||
57 | 2 | 8,9 | 2 | ||||
58 | 2 | 0,2,3 | 1 | ||||
59-63 | Reserved | Reserved | Reserved |
Claims (16)
- 무선 통신 시스템에서 복조 참조 신호(DM-RS: demodulation reference signal)을 수신하는 방법에 있어서, 단말에 의해 수행되는 상기 방법은:기지국으로부터 DM-RS와 관련된 설정 정보를 수신하는 단계;상기 기지국으로부터 PDSCH(Physical downlink control channel)을 스케줄링하기 위한 하향링크 제어 정보(DCI: downlink control information)을 수신하는 단계; 및상기 DCI에 기반하여, 상기 PDSCH 및 상기 PDSCH를 위한 DM-RS를 수신하는 단계를 포함하고,상기 설정 정보에 의해, i) 제1 DM-RS 패턴 및 ii) 상기 제1 DM-RS 패턴 보다 주파수 영역에서 보다 적은 밀도(density)를 가지는 제2 DMRS 패턴이 설정되고,상기 DCI에 의해 지시되는 하나 이상의 안테나 포트가 단일-사용자(SU: single user) 전송 또는 다중 사용자(MU: multi user) 전송과 관련되는지에 기반하여, 상기 제1 DM-RS 패턴 및 상기 제2 DM-RS 패턴 중에서 상기 DM-RS의 패턴이 결정되는, 방법.
- 제1항에 있어서,상기 DCI에 의해 지시되는 상기 하나 이상의 안테나 포트가 SU 전송과 관련됨에 기반하여, 상기 DM-RS의 패턴은 상기 제1 DM-RS 패턴으로 결정되는, 방법.
- 제1항에 있어서,상기 DCI에 의해 지시되는 상기 하나 이상의 안테나 포트가 MU 전송과 관련됨에 기반하여, 상기 DM-RS의 패턴은 상기 제2 DM-RS 패턴으로 결정되는, 방법.
- 제1항에 있어서,특정한 하나 이상의 안테나 포트는 상기 SU 전송과 관련된다고 미리 정의되고,상기 특정한 하나 이상의 안테나 포트들 이외 나머지 안테나 포트들은 상기 MU 전송과 관련되는, 방법.
- 제1항에 있어서,상기 제2 DM-RS 패턴은 상기 제1 DM-RS 패턴에 대한 단일의 CDM(code division multiplexing) 그룹 내 정의된 복수의 서브-CDM 그룹들 중에서 특정 서브-CDM 그룹에 기반하여 설정되는, 방법.
- 제5항에 있어서,상기 DCI에 의해 지시되는 상기 하나 이상의 안테나 포트가 SU 전송과 관련되고 상기 DM-RS의 패턴은 상기 제2 DM-RS 패턴으로 결정됨에 기반하여,상기 DM-RS가 전송되는 서브-CDM 그룹 이외의 하나 이상의 서브-CDM 그룹에는 상기 PDSCH가 전송되는, 방법.
- 제5항에 있어서,상기 DCI에 의해 지시되는 상기 하나 이상의 안테나 포트가 MU 전송과 관련되고 상기 DM-RS의 패턴은 상기 제2 DM-RS 패턴으로 결정됨에 기반하여,상기 DM-RS가 전송되는 서브-CDM 그룹 이외의 하나 이상의 서브-CDM 그룹에는 상기 PDSCH가 전송되지 않는, 방법.
- 제5항에 있어서,상기 복수의 서브-CDM 그룹들은 상기 단일의 CDM 그룹 내에서 주파수 도메인-직교 커버 코드(FD-OCC: frequency domain-orthogonal cover code)가 적용되는 단위로 정의되는, 방법.
- 제5항에 있어서,상기 단일의 CDM 그룹 내에서 서브-CDM 그룹들의 개수가 서로 다른 복수의 복수의 그룹핑 방식이 정의되고,상기 제2 DM-RS 패턴은 상기 복수의 그룹핑 방식 중 하나로 설정되는, 방법.
- 제5항에 있어서,상기 복수의 서브-CDM 그룹들은 주파수 영역에서 특정 물리 자원 블록(PRB: physical resource block) 단위로 반복되는, 방법.
- 제1항에 있어서,상기 제1 DM-RS 패턴 또는 상기 제2 DM-RS 패턴을 적용할 수 있는 i) 구간에 대한 정보 및/또는 ii) 시작과 종료 지점에 대한 정보를 상기 기지국에게 보고하는 단계를 더 포함하는, 방법.
- 무선 통신 시스템에서 복조 참조 신호(DM-RS: demodulation reference signal)을 수신하는 단말에 있어서, 상기 단말은:무선 신호를 송수신하기 위한 적어도 하나의 송수신부(transceiver); 및상기 적어도 하나의 송수신부를 제어하는 적어도 하나의 프로세서를 포함하고,상기 적어도 하나의 프로세서는:기지국으로부터 DM-RS와 관련된 설정 정보를 수신하고;상기 기지국으로부터 PDSCH(Physical downlink control channel)을 스케줄링하기 위한 하향링크 제어 정보(DCI: downlink control information)을 수신하고; 및상기 DCI에 기반하여, 상기 PDSCH 및 상기 PDSCH를 위한 DM-RS를 수신하도록 설정되고,상기 설정 정보에 의해, i) 제1 DM-RS 패턴 및 ii) 상기 제1 DM-RS 패턴 보다 주파수 영역에서 보다 적은 밀도(density)를 가지는 제2 DMRS 패턴이 설정되고,상기 DCI에 의해 지시되는 하나 이상의 안테나 포트가 단일-사용자(SU: single user) 전송 또는 다중 사용자(MU: multi user) 전송과 관련되는지에 기반하여, 상기 제1 DM-RS 패턴 및 상기 제2 DM-RS 패턴 중에서 상기 DM-RS의 패턴이 결정되는, 단말.
- 적어도 하나의 명령을 저장하는 하나 이상의 비-일시적(non-transitory) 컴퓨터 판독가능 매체로서,상기 적어도 하나의 명령은 적어도 하나의 프로세서에 의해서 실행되어, 복조 참조 신호(DM-RS: demodulation reference signal)을 수신하는 장치가:기지국으로부터 DM-RS와 관련된 설정 정보를 수신하고;상기 기지국으로부터 PDSCH(Physical downlink control channel)을 스케줄링하기 위한 하향링크 제어 정보(DCI: downlink control information)을 수신하고; 및상기 DCI에 기반하여, 상기 PDSCH 및 상기 PDSCH를 위한 DM-RS를 수신하도록 제어하고,상기 설정 정보에 의해, i) 제1 DM-RS 패턴 및 ii) 상기 제1 DM-RS 패턴 보다 주파수 영역에서 보다 적은 밀도(density)를 가지는 제2 DMRS 패턴이 설정되고,상기 DCI에 의해 지시되는 하나 이상의 안테나 포트가 단일-사용자(SU: single user) 전송 또는 다중 사용자(MU: multi user) 전송과 관련되는지에 기반하여, 상기 제1 DM-RS 패턴 및 상기 제2 DM-RS 패턴 중에서 상기 DM-RS의 패턴이 결정되는, 컴퓨터 판독가능 매체.
- 무선 통신 시스템에서 복조 참조 신호(DM-RS: demodulation reference signal)을 수신하기 위해 단말을 제어하도록 설정되는 프로세싱 장치에 있어서, 상기 프로세싱 장치는:적어도 하나의 프로세서; 및상기 적어도 하나의 프로세서에 동작 가능하게 연결되고, 상기 적어도 하나의 프로세서에 의해 실행됨에 기반하여, 동작들을 수행하는 지시(instruction)들을 저장하는 적어도 하나의 컴퓨터 메모리를 포함하며,상기 동작들은:기지국으로부터 DM-RS와 관련된 설정 정보를 수신하는 단계;상기 기지국으로부터 PDSCH(Physical downlink control channel)을 스케줄링하기 위한 하향링크 제어 정보(DCI: downlink control information)을 수신하는 단계; 및상기 DCI에 기반하여, 상기 PDSCH 및 상기 PDSCH를 위한 DM-RS를 수신하는 단계를 포함하고,상기 설정 정보에 의해, i) 제1 DM-RS 패턴 및 ii) 상기 제1 DM-RS 패턴 보다 주파수 영역에서 보다 적은 밀도(density)를 가지는 제2 DMRS 패턴이 설정되고,상기 DCI에 의해 지시되는 하나 이상의 안테나 포트가 단일-사용자(SU: single user) 전송 또는 다중 사용자(MU: multi user) 전송과 관련되는지에 기반하여, 상기 제1 DM-RS 패턴 및 상기 제2 DM-RS 패턴 중에서 상기 DM-RS의 패턴이 결정되는, 프로세싱 장치.
- 무선 통신 시스템에서 복조 참조 신호(DM-RS: demodulation reference signal)을 전송하는 방법에 있어서, 기지국에 의해 수행되는 상기 방법은:단말에게 DM-RS와 관련된 설정 정보를 전송하는 단계;상기 단말에게 PDSCH(Physical downlink control channel)을 스케줄링하기 위한 하향링크 제어 정보(DCI: downlink control information)을 전송하는 단계; 및상기 DCI에 기반하여, 상기 PDSCH 및 상기 PDSCH를 위한 DM-RS를 전송하는 단계를 포함하고,상기 설정 정보에 의해, i) 제1 DM-RS 패턴 및 ii) 상기 제1 DM-RS 패턴 보다 주파수 영역에서 보다 적은 밀도(density)를 가지는 제2 DMRS 패턴이 설정되고,상기 DCI에 의해 지시되는 하나 이상의 안테나 포트가 단일-사용자(SU: single user) 전송 또는 다중 사용자(MU: multi user) 전송과 관련되는지에 기반하여, 상기 제1 DM-RS 패턴 및 상기 제2 DM-RS 패턴 중에서 상기 DM-RS의 패턴이 결정되는, 방법.
- 무선 통신 시스템에서 복조 참조 신호(DM-RS: demodulation reference signal)을 전송하는 기지국에 있어서, 상기 기지국은:무선 신호를 송수신하기 위한 적어도 하나의 송수신부(transceiver); 및상기 적어도 하나의 송수신부를 제어하는 적어도 하나의 프로세서를 포함하고,상기 적어도 하나의 프로세서는:단말에게 DM-RS와 관련된 설정 정보를 전송하고;상기 단말에게 PDSCH(Physical downlink control channel)을 스케줄링하기 위한 하향링크 제어 정보(DCI: downlink control information)을 전송하고; 및상기 DCI에 기반하여, 상기 PDSCH 및 상기 PDSCH를 위한 DM-RS를 전송하도록 설정되고,상기 설정 정보에 의해, i) 제1 DM-RS 패턴 및 ii) 상기 제1 DM-RS 패턴 보다 주파수 영역에서 보다 적은 밀도(density)를 가지는 제2 DMRS 패턴이 설정되고,상기 DCI에 의해 지시되는 하나 이상의 안테나 포트가 단일-사용자(SU: single user) 전송 또는 다중 사용자(MU: multi user) 전송과 관련되는지에 기반하여, 상기 제1 DM-RS 패턴 및 상기 제2 DM-RS 패턴 중에서 상기 DM-RS의 패턴이 결정되는, 기지국.
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KR20180004849A (ko) * | 2013-03-13 | 2018-01-12 | 후아웨이 테크놀러지 컴퍼니 리미티드 | 파일럿 신호를 결정하는 시스템 및 방법 |
KR20190059976A (ko) * | 2016-10-11 | 2019-05-31 | 텔레호낙티에볼라게트 엘엠 에릭슨(피유비엘) | 복조 참조 신호들의 밀도를 적응시키기 위한 방법들 |
JP2020010072A (ja) * | 2016-11-02 | 2020-01-16 | シャープ株式会社 | 基地局装置、端末装置および通信方法 |
JP2021502777A (ja) * | 2017-11-13 | 2021-01-28 | 日本電気株式会社 | 端末、ネットワーク装置、及び方法 |
WO2021018209A1 (zh) * | 2019-07-30 | 2021-02-04 | 华为技术有限公司 | 一种dmrs端口指示方法及装置 |
-
2022
- 2022-07-12 EP EP22842409.9A patent/EP4373023A1/en active Pending
- 2022-07-12 WO PCT/KR2022/010085 patent/WO2023287147A1/ko active Application Filing
- 2022-07-12 KR KR1020247000913A patent/KR20240022554A/ko unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180004849A (ko) * | 2013-03-13 | 2018-01-12 | 후아웨이 테크놀러지 컴퍼니 리미티드 | 파일럿 신호를 결정하는 시스템 및 방법 |
KR20190059976A (ko) * | 2016-10-11 | 2019-05-31 | 텔레호낙티에볼라게트 엘엠 에릭슨(피유비엘) | 복조 참조 신호들의 밀도를 적응시키기 위한 방법들 |
JP2020010072A (ja) * | 2016-11-02 | 2020-01-16 | シャープ株式会社 | 基地局装置、端末装置および通信方法 |
JP2021502777A (ja) * | 2017-11-13 | 2021-01-28 | 日本電気株式会社 | 端末、ネットワーク装置、及び方法 |
WO2021018209A1 (zh) * | 2019-07-30 | 2021-02-04 | 华为技术有限公司 | 一种dmrs端口指示方法及装置 |
Also Published As
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EP4373023A1 (en) | 2024-05-22 |
KR20240022554A (ko) | 2024-02-20 |
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