WO2024106429A1 - Terminal, procédé de communication sans fil et station de base - Google Patents
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Definitions
- This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- Non-Patent Document 1 LTE-Advanced (3GPP Rel. 10-14) was specified for the purpose of achieving higher capacity and greater sophistication over LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).
- LTE 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- NR future wireless communication systems
- beam management techniques are being introduced.
- NR it is being considered to form (or use) beams in at least one of the base station and the user terminal (user terminal, User Equipment (UE)).
- UE User Equipment
- multiple port reference signals e.g., demodulation reference signals (DMRS)
- DMRS demodulation reference signals
- one of the objectives of this disclosure is to provide a terminal, a wireless communication method, and a base station that use an appropriate number of DMRS ports.
- a terminal has a receiver that receives a first demodulation reference signal (DMRS) setting to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied, and receives a downlink control information format including an antenna port field, and a controller that determines a combination corresponding to a value of the antenna port field based on one of the following associations: a first association that associates multiple combinations of multiple ports including the port of the first DMRS and corresponding to multiple transmission/reception points with multiple values of the antenna port field, and a second association that associates multiple combinations of multiple ports including the port of the first DMRS and corresponding to one transmission/reception point with multiple values of the antenna port field.
- DMRS demodulation reference signal
- FD-OCC frequency domain orthogonal cover code
- an appropriate number of DMRS ports can be used.
- FIG. 1 shows an example of a DMRS port table for DMRS Type 1.
- FIG. 2 shows an example of a DMRS port table for DMRS Type 2.
- 3A and 3B show an example of a length-4 FD-OCC.
- FIG. 4 shows an example of a DMRS port table for DMRS extension type 1.
- FIG. 5 shows an example of a DMRS port table for DMRS extension type 2.
- FIG. 6 shows an example of category 3 of DMRS port combinations.
- FIG. 7 shows an example of category 1 of DMRS port combinations.
- FIG. 8 shows an example of category 2 of DMRS port combinations.
- FIG. 9 shows an example of a new antenna port table when using Rel. 18 DMRS ports.
- FIG. 10 shows an example of a DMRS port combination according to embodiment #1.
- FIG. 11 shows an example of a DMRS port combination according to embodiment #2.
- FIG. 12 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 13 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- FIG. 14 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- FIG. 15 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- FIG. 16 is a diagram illustrating an example of a vehicle according to an embodiment.
- Beam Management In NR, a beam management technique is introduced. For example, in NR, forming (or using) a beam in at least one of a base station and a UE is considered.
- Beam Forming Beam Forming (BF)
- BF Beam Forming
- BF is a technology that uses, for example, a massive element antenna to form a beam (antenna directivity) by controlling the amplitude/phase of the signal transmitted or received from each element (also called precoding).
- MIMO Multiple Input Multiple Output
- Beam sweeping may be performed on both the transmitting and receiving sides to select an appropriate pair from multiple patterns of candidate transmitting and receiving beam pairs.
- a pair of transmitting and receiving beams may be called a beam pair and may be identified as a beam pair candidate index.
- multiple levels of beam control such as a rough beam and a fine beam, may be performed.
- Digital BF and analog BF can be classified into digital BF and analog BF.
- Digital BF and analog BF may be called digital precoding and analog precoding, respectively.
- Digital BF is, for example, a method of performing precoding signal processing (on digital signals) on the baseband.
- parallel processing such as Inverse Fast Fourier Transform (IFFT), Digital to Analog Converter (DAC), and Radio Frequency (RF) is required for the number of antenna ports (or RF chains).
- IFFT Inverse Fast Fourier Transform
- DAC Digital to Analog Converter
- RF Radio Frequency
- beams can be formed at any timing, in a number that corresponds to the number of RF chains.
- Analog beamforming is, for example, a method that uses a phase shifter on the RF. Although analog beamforming cannot form multiple beams at the same timing, it can be easily configured and implemented at low cost because it only rotates the phase of the RF signal.
- TCI transmission configuration indication state
- the TCI state may represent that which applies to the downlink signal/channel.
- the equivalent of the TCI state which applies to the uplink signal/channel may be expressed as a spatial relation.
- TCI state is information about the Quasi-Co-Location (QCL) of signals/channels and may also be called spatial reception parameters, Spatial Relation Information (SRI), etc.
- TCI state may be configured in the UE on a per channel or per signal basis.
- QCL is an index that indicates the statistical properties of a signal/channel. For example, if a signal/channel has a QCL relationship with another signal/channel, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) is identical between these different signals/channels (i.e., it is QCL with respect to at least one of these).
- spatial parameters e.g., spatial Rx parameters
- the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL.
- the QCL (or at least one element of the QCL) in this disclosure may be interpreted as sQCL (spatial QCL).
- QCL types QCL types
- QCL types A to D may be provided, each of which has different parameters (or parameter sets) that can be assumed to be the same.
- the parameters (which may be called QCL parameters) are as follows: QCL Type A: Doppler shift, Doppler spread, mean delay and delay spread, QCL Type B: Doppler shift and Doppler spread, QCL Type C: Doppler shift and mean delay, QCL Type D: Spatial reception parameters.
- Types A to C may correspond to QCL information related to synchronization processing of at least one of time and frequency
- type D may correspond to QCL information related to beam control.
- the UE's assumption that a given Control Resource Set (CORESET), channel or reference signal is in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel or reference signal may be referred to as a QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- the UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI condition or QCL assumption of the signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information regarding the QCL between the target channel (or a reference signal (RS) for that channel) and another signal (e.g., another downlink reference signal (DL-RS)).
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or any combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- the MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc.
- the broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- the physical layer signaling may be, for example, Downlink Control Information (DCI).
- DCI Downlink Control Information
- the channel for which the TCI state is set (specified) may be, for example, at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)), the downlink control channel (Physical Downlink Control Channel (PDCCH)), the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and the uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- the RS (DL-RS) that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), and a sounding reference signal (SRS).
- the DL-RS may be a CSI-RS (also called a tracking reference signal (TRS)) used for tracking, or a reference signal (also called a QRS) used for QCL detection.
- TRS tracking reference signal
- QRS reference signal
- An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be referred to as an SS/PBCH block.
- the TCI state information element (RRC's "TCI-state IE") set by higher layer signaling may include one or more pieces of QCL information ("QCL-Info").
- the QCL information may include at least one of information on the DL-RS that is in a QCL relationship (DL-RS relationship information) and information indicating the QCL type (QCL type information).
- the DL-RS relationship information may include information such as the index of the DL-RS (e.g., SSB index, non-zero-power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource identifier), the index of the cell in which the RS is located, and the index of the Bandwidth Part (BWP) in which the RS is located.
- the index of the DL-RS e.g., SSB index, non-zero-power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource identifier
- NZP Non-Z
- Multi-TRP In NR, one or more transmission/reception points (TRPs) (multi-TRPs) are considered to perform DL transmission to a UE using one or more panels (multi-panels). It is also considered that a UE performs UL transmission to one or more TRPs.
- TRPs transmission/reception points
- multiple TRPs may correspond to the same cell identifier (Cell Identifier (ID)), different cell IDs, different TCI state positions/orders, different CORESET pools, or different SRS resource sets.
- the cell ID may be a physical cell ID (e.g., PCI) or a virtual cell ID.
- TRP1 transmits both control signals (PDCCH) and data signals (PDSCH) to the UE.
- PDCCH control signals
- PDSCH data signals
- single TRP mode may refer to the mode when multi-TRP (mode) is not set.
- the UE receives each PDSCH transmitted from the multi-TRP based on one downlink control information (Downlink Control Information (DCI)).
- DCI Downlink Control Information
- a first control signal may be transmitted from TRP1 and a second control signal (DCI) may be transmitted from TRP2.
- the UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.
- the DCI may be called a single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from multiple TRPs are scheduled using multiple DCIs, these multiple DCIs may be called multiple DCIs (M-DCI, multiple PDCCHs).
- Each TRP in a multi-TRP may transmit a different Transport Block (TB)/Code Word (CW)/different layer.
- TB Transport Block
- CW Code Word
- each TRP in a multi-TRP may transmit the same TB/CW/layer.
- Non-Coherent Joint Transmission is being considered as one form of multi-TRP transmission.
- TRP1 modulates and maps a first codeword, and transmits a first PDSCH using a first number of layers (e.g., two layers) and a first precoding by layer mapping.
- TRP2 modulates and maps a second codeword, and transmits a second PDSCH using a second number of layers (e.g., two layers) and a second precoding by layer mapping.
- multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains.
- the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with each other in at least one of the time and frequency resources.
- the first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).
- QCL type D e.g., QCL type D
- PDSCH transport block (TB) or codeword (CW) repetition across multi-TRP is supported. It is considered that repetition methods (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, 4) across multi-TRP in the frequency domain, layer (spatial) domain, or time domain are supported.
- URLLC schemes e.g., schemes 1, 2a, 2b, 3, 4
- multi-PDSCH from multi-TRP is space division multiplexed (SDM).
- SDM space division multiplexed
- FDM frequency division multiplexed
- RV redundancy version
- the RV may be the same or different for multi-TRP.
- multiple PDSCHs from multiple TRPs are time division multiplexed (TDM).
- TDM time division multiplexed
- multiple PDSCHs from multiple TRPs are transmitted in one slot.
- multiple PDSCHs from multiple TRPs are transmitted in different slots.
- Such a multi-TRP scenario allows for more flexible transmission control using channels with better quality.
- NCJT using multiple TRPs/panels may use higher ranks.
- both single DCI single PDCCH
- multiple DCI multiple PDCCH
- the maximum number of TRPs may be 2.
- TCI extension For single PDCCH design (mainly for ideal backhaul), TCI extension is being considered.
- Each TCI code point in the DCI may correspond to TCI state 1 or 2.
- the TCI field size may be the same as that of Rel. 15.
- one TCI state without CORESETPoolIndex (also called TRP Info) is set for one CORESET.
- a CORESET pool index is set for each CORESET.
- the MIMO technology has been used in frequency bands (or frequency bands) lower than 6 GHz so far, but it is being considered to apply the technology to frequency bands higher than 6 GHz in the future.
- Frequency bands lower than 7.125 GHz may be called Frequency Range (FR) 1, etc.
- Frequency bands higher than 7.125 GHz/24.250 GHz may be called FR2, FR2-1, FR2-2, millimeter wave (mmW), FR4, etc.
- the maximum number of MIMO layers is expected to be limited by the antenna size.
- orthogonal precoding or orthogonal beams, digital beams
- frequency utilization efficiency can be improved by simultaneously applying orthogonal precoding (or orthogonal beams, digital beams) to multiple UEs. If digital beams cannot be applied appropriately, interference between UEs will increase, leading to deterioration of communication quality (or reduction in cell capacity).
- orthogonal in this disclosure may be interpreted as quasi-orthogonal.
- a base station (which may also be read as a Transmission/Reception Point (TRP), panel, etc.) can only transmit one beam at a given time, the base station switches the beam to the UE to transmit and receive. If a base station can transmit multiple beams at a given time, the base station can simultaneously transmit and receive with multiple UEs using different beams.
- TRP Transmission/Reception Point
- the front-loaded DMRS is the first (first symbol or near first symbol) DMRS for faster demodulation.
- the additional DMRS can be configured by RRC for fast moving UEs or high modulation and coding scheme (MCS)/rank.
- MCS modulation and coding scheme
- the frequency location of the additional DMRS is the same as the front-loaded DMRS.
- DMRS mapping type A or B For the time domain, DMRS mapping type A or B is configured.
- DMRS position l_0 is counted by the symbol index in the slot.
- l_0 is configured by the parameter (dmrs-TypeA-Position) in the MIB or common serving cell configuration (ServingCellConfigCommon).
- DMRS position 0 (reference point l) means the first symbol of the slot or each frequency hop.
- DMRS mapping type B DMRS position l_0 is counted by the symbol index in the PDSCH/PUSCH. l_0 is always 0.
- DMRS position 0 (reference point l) means the first symbol of the PDSCH/PUSCH or each frequency hop.
- DMRS location is defined by a table in the specification and depends on the duration of PDSCH/PUSCH. The location of additional DMRS is fixed.
- DMRS setting type 1 or 2 is set for the frequency domain.
- DMRS setting type 1 maps a DMRS sequence to one subcarrier for every two subcarriers in the frequency domain, so up to two DMRSs can be FDMed.
- DMRS setting type 2 is applicable only to CP-OFDM.
- DMRS setting type 2 maps a DMRS sequence to two consecutive subcarriers for every six subcarriers in the frequency domain, so up to three DMRSs can be FDMed.
- Single symbol DMRS or double symbol DMRS is configured.
- Single-symbol DMRS is normally used (mandatory in Rel. 15).
- the number of additional DMRS is ⁇ 0,1,2,3 ⁇ .
- Single-symbol DMRS supports both frequency hopping enabled and disabled. If maxLength in the uplink DMRS configuration (DMRS-UplinkConfig) is not set, single-symbol DMRS is used.
- Double symbol DMRS is used for more DMRS ports (especially MU-MIMO).
- double symbol DMRS the number of additional DMRS (symbols) is ⁇ 0,1 ⁇ . Double symbol DMRS is supported when frequency hopping is disabled. If the maxLength in the uplink DMRS configuration (DMRS-UplinkConfig) is 2 (len2), whether it is single symbol DMRS or double symbol DMRS is determined by DCI or configured grant.
- the possible setting patterns for DMRS are the following combinations: DMRS setting type 1, DMRS mapping type A, single symbol DMRS DMRS setting type 1, DMRS mapping type A, double symbol DMRS DMRS setting type 1, DMRS mapping type B, single symbol DMRS DMRS setting type 1, DMRS mapping type B, double symbol DMRS DMRS setting type 2, DMRS mapping type A, single symbol DMRS DMRS setting type 2, DMRS mapping type A, double symbol DMRS DMRS setting type 2, DMRS mapping type B, single symbol DMRS DMRS setting type 2, DMRS mapping type B, double symbol DMRS mapping type 2, DMRS mapping type B, double symbol DMRS mapping type B, double symbol DMRS mapping type B, double symbol DMRS mapping type B, double symbol DMRS setting type 2, DMRS mapping type B, double symbol DMRS mapping type B, double symbol DMRS setting type 2, DMRS mapping type B, double symbol DMRS mapping type B, double symbol DMRS setting type 2, DMRS mapping
- DMRS code division multiplexing (CDM) group Multiple DMRS ports that are mapped to the same RE (time and frequency resource) are called a DMRS code division multiplexing (CDM) group.
- CDM DMRS code division multiplexing
- each DMRS CDM group two DMRS ports are multiplexed by an FD OCC of length 2. Between multiple DMRS CDM groups (two DMRS CDM groups), two DMRS ports are multiplexed by FDM.
- DMRS configuration type 1 and double symbol DMRS eight DMRS ports can be used.
- two DMRS ports are multiplexed by an FD OCC of length 2, and two DMRS ports are multiplexed by a TD OCC.
- two DMRS ports are multiplexed by FDM.
- each DMRS CDM group two DMRS ports are multiplexed by an FD OCC of length 2. Between multiple DMRS CDM groups (three DMRS CDM groups), three DMRS ports are multiplexed by FDM.
- each DMRS CDM group 12 DMRS ports can be used.
- two DMRS ports are multiplexed by an FD OCC of length 2, and two DMRS ports are multiplexed by a TD OCC.
- three DMRS ports are multiplexed by FDM.
- DMRS mapping type B is shown, but DMRS mapping type A is similar.
- DMRS ports 1000-1007 can be used for DMRS setting type 1
- DMRS ports 1000-1011 can be used for DMRS setting type 2.
- DMRS ports 0-7 can be used for DMRS setting type 1
- DMRS ports 0-11 can be used for DMRS setting type 2.
- DMRS demodulation reference signals
- CSI-RS CSI-RS
- a different DMRS port/CSI-RS port may be set for each layer.
- SU-MIMO Single User MIMO
- MU-MIMO Multi User MIMO
- a different DMRS port/CSI-RS port may be set for each layer within one UE and for each UE.
- multiple-port DMRS can be supported using Frequency Division Multiplexing (FDM), Frequency Domain Orthogonal Cover Code (FD-OCC), Time Domain OCC (TD-OCC), etc., with up to eight ports for Type 1 DMRS (in other words, DMRS setting type 1) and up to 12 ports for Type 2 DMRS (in other words, DMRS setting type 2).
- FDM Frequency Division Multiplexing
- FD-OCC Frequency Domain Orthogonal Cover Code
- TD-OCC Time Domain OCC
- a comb-like transmission frequency pattern (comb-like resource set) is used for the FDM.
- Cyclic Shift (CS) is used for the FD-OCC.
- the TD-OCC can be applied only to double-symbol DMRS.
- the OCC disclosed herein may be interchangeably read as orthogonal code, orthogonalization, cyclic shift, etc.
- the DMRS type may also be referred to as the DMRS configuration type.
- DMRS that are resource-mapped in units of two consecutive (adjacent) symbols may be called double-symbol DMRS, and DMRS that are resource-mapped in units of one symbol may be called single-symbol DMRS.
- Each DMRS may be mapped to one or more symbols per slot depending on the length of the data channel.
- the DMRS mapped to the start of the data symbol may be called a front-loaded DMRS, and the DMRS additionally mapped to other positions may be called an additional DMRS.
- Comb and CS may be used for orthogonalization.
- up to four antenna ports (APs) may be supported by using two types of Comb and two types of CS (Comb2+2CS).
- Comb, CS and TD-OCC may be used for orthogonalization.
- up to eight APs may be supported using two types of Comb, two types of CS and TD-OCC ( ⁇ 1,1 ⁇ and ⁇ 1,-1 ⁇ ).
- FD-OCC may be used for orthogonalization.
- up to six APs may be supported by applying an orthogonal code (2-FD-OCC) to two adjacent resource elements (REs) in the frequency direction.
- FD-OCC and TD-OCC may be used for orthogonalization.
- up to 12 APs may be supported by applying an orthogonal code (2-FD-OCC) to two adjacent REs in the frequency direction and a TD-OCC ( ⁇ 1,1 ⁇ and ⁇ 1,-1 ⁇ ) to two adjacent REs in the time direction.
- 2-FD-OCC orthogonal code
- TD-OCC ⁇ 1,1 ⁇ and ⁇ 1,-1 ⁇
- a group of DMRS ports that are orthogonalized by the FD-OCC/TD-OCC as described above is also called a Code Division Multiplexing (CDM) group.
- CDM Code Division Multiplexing
- Different CDM groups are orthogonal because they are FDM-multiplexed.
- the orthogonality of the applied OCC may be lost due to channel fluctuations, etc.
- signals within the same CDM group are received with different reception powers, a near-far problem may occur and orthogonality may not be guaranteed.
- the DMRS mapped to a resource element (RE) may correspond to a sequence obtained by multiplying the DMRS sequence by a parameter (which may be called a sequence element, etc.) w f (k') of the FD-OCC and a parameter (which may be called a sequence element, etc.) w t (l') of the TD-OCC.
- By multiplying this FD-OCC in RE units it is possible to multiplex two-port DMRS using the same time and frequency resources (2 REs).
- By applying both the FD-OCC and TD-OCC it is possible to multiplex four-port DMRS using the same time and frequency resources (4 REs).
- the two Rel. 15 DMRS port tables for PDSCH mentioned above correspond to DMRS setting types 1 and 2, respectively.
- p indicates the antenna port number
- ⁇ indicates the parameter for shifting (offsetting) the frequency resource.
- FDM is applied to antenna ports 1000-1001 and antenna ports 1002-1003 (and also antenna ports 1004-1005 in the case of Type 2) by applying different values of ⁇ . Therefore, antenna ports 1000-1003 (or 1000-1005) corresponding to single-symbol DMRS are orthogonalized using FD-OCC and FDM.
- the antenna ports 1000-1007 (or 1000-1011) corresponding to double symbol DMRS are orthogonalized using FD-OCC, TD-OCC, and FDM.
- CP-OFDM For CP-OFDM only, the following are being considered: specifying a larger number of orthogonal DMRS ports for DL/UL MU-MIMO (without increasing DMRS overhead); common design between DL and UL DMRS; up to 24 orthogonal DMRS ports; doubling the maximum number of orthogonal DMRS ports for both single-symbol DMRS and double-symbol DMRS for each applicable DMRS configuration type.
- ⁇ Option 1> Introduction of a new OCC with a length greater than the existing OCC (e.g. 4 or 6).
- the items to be considered include the possibility of performance degradation when the delay spread is large, the possibility of scheduling restrictions, and backward compatibility.
- TD-OCC on non-contiguous multiple DMRS symbols (eg, TD-OCC on front-loaded/additional DMRS).
- considerations include possible performance degradation at high UE speeds, possible scheduling restrictions (e.g., how frequency hopping is applied), possible restrictions on DMRS configuration (e.g., limiting the number of additional DMRS), and backward compatibility.
- ⁇ Option 3> Increase the number of CDM groups (e.g. increase the number of combs/FDMs).
- issues to be considered include the possibility of performance degradation when the delay spread is large, and backward compatibility.
- ⁇ Option 4> Reuse symbols for additional DMRS to increase the number of orthogonal DMRS ports.
- considerations include the possibility of performance degradation at high UE speeds, the possibility of DMRS configuration restrictions (e.g., limiting the number of additional DMRSs), and backward compatibility.
- TD-OCC Use of TD-OCC on non-contiguous multiple DMRS symbols in combination with FD-OCC/FDM (reuse additional DMRS symbols to improve channel estimation performance).
- considerations include possible performance degradation at high UE speeds, possible scheduling restrictions (e.g., how frequency hopping is applied), possible restrictions on DMRS configuration (e.g., limiting the number of additional DMRS), and backward compatibility.
- the new FD-OCC for DMRS of PDSCH/PUSCH may follow at least one of the following options for DMRS extension type 1: ⁇ Option 1-1>> A new FD-OCC of length 6 is applied to 6 REs of DMRS in one PRB in one CDM group. ⁇ Option 1-2>> Within one CDM group, a new FD-OCC of length 4 is applied to 4 REs of DMRS within one PRB or across multiple consecutive PRBs.
- the new FD-OCC for DMRS of PDSCH/PUSCH is a new FD-OCC of length 4 that is applied to 4 REs of DMRS in one PRB in one CDM group for DMRS extension type 2.
- a new FD-OCC of length 6 may also be supported for DMRS extension type 2.
- existing FD-OCC#0 may be [+1 +1]
- existing FD-OCC#1 may be [+1 -1].
- the new FD-OCC may be any of the following OCCs:
- OCC1-2 Length-4 OCC based on cyclic shifts.
- OCC#0 and #1 the first and second halves of OCC#0 and #1 (OCCs corresponding to OCC indexes 0 and 1) of length 4 are the same as OCC#0 and #1 (OCCs corresponding to OCC indexes 0 and 1) of length 2.
- OCC FD-OCC/TD-OCC corresponding to OCC index i
- OCC#i OCC#i
- Some of the multiple series of the new FD-OCC may be associated with a Rel. 15 DMRS port index.
- the Rel. 15 DMRS port table for DMRS configuration type 1 and the Rel. 15 DMRS port table for DMRS configuration type 2 may be used.
- DMRS maximum length and maxLength may be interpreted interchangeably.
- the existing FD-OCC, the FD-OCC of length 2, the Rel. 15 FD-OCC, and wf (k') may be interchanged.
- the new FD-OCC, the FD-OCC longer than 2, the Rel. 18 FD-OCC, and wf (k') may be interchanged.
- the Rel. 18 DMRS Port Table may indicate the DMRS port (p is 0 or greater) corresponding to the new FD-OCC. At least some of the values of p in the Rel. 18 DMRS Port Table may overlap with the values of p in the Rel. 15 DMRS Port Table. If the UE is configured/instructed to use the new FD-OCC, the UE may use the Rel. 18 DMRS Port Table, and if the UE is not configured/instructed to use the new FD-OCC, the UE may use the Rel. 15 DMRS Port Table.
- the Rel. 18 DMRS port table for DMRS extension type 1 may be the DMRS port table of FIG. 4.
- DMRS port table of FIG. 4.
- the same DMRS port index (DMRS ports 0 to 7) as the Rel. 15 DMRS ports may be used.
- DMRS ports with new FD-OCC#2 3, a different DMRS port index (DMRS ports 8 to 15) than the Rel. 15 DMRS ports may be used.
- the Rel. 18 DMRS port table for DMRS extension type 2 may be the DMRS port table of FIG. 5.
- the same DMRS port index (DMRS ports 0 to 11) as the Rel. 15 DMRS ports may be used for the DMRS ports with new FD-OCC #0, 1.
- a different DMRS port index (DMRS ports 12 to 23) than the Rel. 15 DMRS ports may be used for the DMRS ports with new FD-OCC #2, 3.
- MU-MIMO Scheduling Constraints For MU-MIMO, multiple DMRSs for multiple UEs are multiplexed. Multiple DMRSs may be CDMed using different OCCs within one CDM group, or FDMed using different subcarriers (Comb) between multiple CDM groups.
- CDM a problem occurs due to the difference in distance from the base station to multiple UEs (near-far problem). In a flat fading environment, no inter-symbol interference occurs, but in a frequency selective fading environment, inter-symbol interference occurs and quality deteriorates. In order to prevent this, MU-MIMO scheduling constraints (existing MU-MIMO scheduling constraints) are specified.
- DMRS configuration type 1 if a UE is scheduled with one codeword (CW) and assigned an antenna port mapping with indices ⁇ 2, 9, 10, 11, 30 ⁇ in the existing antenna port table for DMRS configuration type 1, or if the UE is scheduled with two CWs, the UE may assume that the remaining orthogonal antenna ports are not associated with transmitting PDSCH to another UE.
- CW codeword
- a new antenna port table is defined that is similar to the existing antenna port table.
- Method B The existing antenna port table is reused.
- the size of the antenna port field in the DCI is maintained.
- the existing antenna port table is reused.
- the size of the antenna port field in the DCI is maintained.
- a new table is introduced to indicate Rel. 18 DMRS ports, including 8/16 ports or 12/24 ports.
- the time domain resource allocation (TDRA) entry that is configured may include an indication of which DMRS ports are used for scheduling.
- Method D The existing antenna port table is reused. The size of the antenna port field in the DCI is maintained. A new table is introduced to indicate Rel. 18 DMRS ports with Rel. 18 DMRS port index. At least one DMRS port with Rel. 18 DMRS port index p may be included in each row.
- the DMRS port for PDSCH is determined by p+1000.
- Figure 7 shows an example of Category 1 for Extended Type 1 DMRS and rank 8.
- MU-MIMO is not possible for ranks greater than 4 (2CW). This means that the user capacity of MU-MIMO cannot be increased unless category 3 is allowed.
- the inventors therefore came up with the idea of indicating/determining the DMRS port combination.
- A/B and “at least one of A and B” may be interpreted as interchangeable. Also, in this disclosure, “A/B/C” may mean “at least one of A, B, and C.”
- Radio Resource Control RRC
- RRC parameters RRC parameters
- RRC messages higher layer parameters
- information elements IEs
- settings etc.
- MAC Control Element CE
- update commands activation/deactivation commands, etc.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or any combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- the MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc.
- the broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- the physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.
- DCI Downlink Control Information
- UCI Uplink Control Information
- index identifier
- indicator indicator
- resource ID etc.
- sequence list, set, group, cluster, subset, etc.
- DMRS port antenna port, port, port number, and port index may be interpreted as interchangeable.
- RB and PRB may be interpreted interchangeably.
- OCC#i and an OCC corresponding to OCC index i may be read as interchangeable.
- an existing FD-OCC, an FD-OCC of length 2, and wf (k') may be read as interchangeable.
- a new FD-OCC, an FD-OCC longer than 2, and wf (k') may be read as interchangeable.
- the existing ports may be ports 0 to 7 in DMRS extension type 1 and ports 0 to 11 in DMRS extension type 2.
- the new ports may be ports 8 to 15 in DMRS extension type 1 and ports 12 to 23 in DMRS extension type 2.
- DMRS port table DMRS port and parameter association may be interpreted as interchangeable.
- the parameters may include at least one of the CDM group, ⁇ , FD OCC, and TD OCC.
- the antenna port indication table, the antenna port table, and the association of antenna port field values and parameters may be interpreted as interchangeable.
- the parameters may include at least one of the number of DMRS CDM groups without data, the DMRS port (number/index), and the number of preceding DMRS symbols.
- TRP transmission point
- panel DMRS port group
- CORESET pool one of two TCI states associated with one code point in the TCI field
- the transmission/reception of a channel/signal using a single TRP may be interpreted as the TCI states (joint/separate/indicative TCI states) being equal in the transmission/reception of that channel/signal (e.g., NCJT/CJT/repeat), or the number of TCI states (joint/separate/indicative TCI states) being one in the transmission/reception of that channel/signal (e.g., NCJT/CJT/repeat).
- Transmission/reception of a channel/signal using a single TRP may be interpreted as the TCI states (joint/separate/indicated TCI states) being different in the transmission/reception of the channel/signal (e.g., NCJT/CJT/repeat), or the number of different TCI states (joint/separate/indicated TCI states) being multiple (e.g., two) in the transmission/reception of the channel/signal (e.g., NCJT/CJT/repeat).
- single TRP, single TRP system, single TRP transmission, and single PDSCH may be read as interchangeable.
- multi TRP, multi TRP system, multi TRP transmission, and multi PDSCH may be read as interchangeable.
- a single DCI, a single PDCCH, multiple TRP based on a single DCI, activating two TCI states on at least one TCI code point, mapping at least one code point of a TCI field to two TCI states, and setting a specific index (e.g., a TRP index, a CORESET pool index, or an index corresponding to a TRP) for a specific channel/CORESET may be interpreted as interchangeable.
- a single TRP, a channel/signal using a single TRP, a channel using one TCI state/spatial relationship, multi-TRP not being enabled by RRC/DCI, multiple TCI states/spatial relationships not being enabled by RRC/DCI, a CORESETPoolIndex value of 1 not being set for any CORESET, and no code point in the TCI field being mapped to two TCI states may be read as interchangeable.
- multi-TRP channel/signal using multi-TRP, channel using multiple TCI states/spatial relationships, multi-TRP enabled by RRC/DCI, multiple TCI states/spatial relationships enabled by RRC/DCI, and at least one of multi-TRP based on a single DCI and multi-TRP based on multiple DCI may be read as interchangeable.
- multi-TRP based on multi-DCI setting one CORESET pool index (CORESETPoolIndex) value for a CORESET
- multiple specific indexes e.g., TRP indexes, CORESET pool indexes, or indexes corresponding to TRPs
- TRP#2 (second TRP)
- single DCI sDCI
- single PDCCH multi-TRP system based on single DCI
- sDCI-based MTRP multi-TRP system based on single DCI
- activation of two TCI states on at least one TCI codepoint may be read as interchangeable.
- multi-DCI multi-PDCI
- multi-PDCCH multi-PDCCH
- multi-TRP system based on multi-DCI
- mDCI-based MTRP two CORESET pool indices
- beam instruction DCI, beam instruction MAC CE, and beam instruction DCI/MAC CE may be interpreted as interchangeable.
- an instruction regarding the instruction TCI state to the UE may be given using at least one of DCI and MAC CE.
- channel, signal, and channel/signal may be read as interchangeable.
- DL channel, DL signal, DL signal/channel, transmission/reception of DL signal/channel, DL reception, and DL transmission may be read as interchangeable.
- UL channel, UL signal, UL signal/channel, transmission/reception of UL signal/channel, UL reception, and UL transmission may be read as interchangeable.
- applying TCI state/QCL assumptions to each channel/signal/resource may mean applying TCI state/QCL assumptions to transmission and reception of each channel/signal/resource.
- the first TRP may correspond to the first TCI state (the first TCI state indicated).
- the second TRP may correspond to the second TCI state (the second TCI state indicated).
- the nth TRP may correspond to the nth TCI state (the nth TCI state indicated).
- the first CORESET pool index value (e.g., 0), the first TRP index value (e.g., 1), and the first TCI state (first DL/UL (joint/separate) TCI state) may correspond to each other.
- the second CORESET pool index value (e.g., 1), the second TRP index value (e.g., 2), and the second TCI state (second DL/UL (joint/separate) TCI state) may correspond to each other.
- the terms "the Rel. 18 DMRS port is set” and “the DMRS extension type 1/2 is set” may be interpreted as interchangeable.
- the antenna port field value, the number of DMRS CDM groups without data, and the DMRS port are merely examples, and other values may be specified.
- DMRS port combinations in the existing antenna port table may be reused.
- only DMRS ports among DMRS ports 0 to 7 may be indicated for DMRS extension type 1
- only DMRS ports among DMRS ports 0 to 11 may be indicated for DMRS extension type 2.
- up to three or four DMRS ports in the same CDM group may be indicated, as in the example of Figure 9. For example, ports #0, #1, #8, and #9 may be indicated for DMRS extension type 1.
- the application of multiple TCI states in transmission and reception using multiple TRPs is mainly described in terms of a method targeting two TRPs (i.e., when at least one of N and M is 2), but the number of TRPs may be three or more (multiple), and each embodiment may be applied to correspond to the number of TRPs. In other words, at least one of N and M may be a number greater than 2.
- Each embodiment may be applied to the DMRS of the PDSCH or the DMRS of the PUSCH.
- the PUSCH DMRS port index may be represented as p, and the PDSCH DMRS port index may be represented as p+1000.
- Each embodiment may be applied to single-symbol DMRS or double-symbol DMRS.
- Each of the following embodiments may be applied to DMRS setting type 1 or DMRS setting type 2.
- Each embodiment may be applied to DMRS extension type 1 or DMRS extension type 2.
- the MU-MIMO scheduling constraint and the free (remaining) orthogonal DMRS ports not being used by another UE may be interpreted as interchangeable.
- This embodiment relates to MU-MIMO scheduling constraints for Rel.18 DMRS ports.
- the UE may adhere to at least one of the following constraints:
- Constraint 1 Existing MU-MIMO scheduling constraints apply, which means that many DMRS ports cannot be used by other UEs, e.g., for ranks greater than 4, 2CW, if category 1/2 DMRS port combinations are used, the free ports cannot be used by other UEs.
- Constraint 2 The MU-MIMO scheduling constraints are updated.
- the UE may comply with at least one of the following constraints: --Constraint 2-1 No existing MU-MIMO scheduling constraints: There may be no MU-MIMO scheduling constraints for Rel. 18 DMRS ports. --Constraint 2-2 Some new MU-MIMO scheduling constraints are introduced. --Constraint 2-3 There is no MU-MIMO scheduling constraint across different CDM groups, and a new MU-MIMO scheduling constraint within one CDM group is introduced.
- the MU-MIMO scheduling constraint in constraint 1 may be such that, in the example of FIG. 10, when a DMRS port combination using two CDM groups #0 and #1 is indicated in extended type 2, a DMRS port in another CDM group #2 cannot be applied to another UE.
- the MU-MIMO scheduling constraint in constraint 2-3 may be such that, in the example of FIG. 10, when a DMRS port combination using two CDM groups #0 and #1 is indicated in extended type 2, a DMRS port in another CDM group #2 may be assigned to another UE.
- the UE can be instructed on the appropriate DMRS port combination for Rel. 18 DMRS.
- Category 3 DMRS port combinations reduce DMRS overhead and improve UE throughput by not using double symbol DMRS.
- a category 3 DMRS port combination may be specified.
- a UE may be assigned a DMRS port corresponding to TD-OCC index #0, and another UE may be assigned a DMRS port corresponding to TD-OCC index #1.
- MU-MIMO is possible, and system capacity can be improved.
- the UE can be instructed on the appropriate DMRS port combination for Rel. 18 DMRS.
- This embodiment relates to a DMRS port for multiple TRPs.
- the UE may refer to different antenna port tables (DMRS port combinations, DMRS port tables) when multi-TRP is configured and when multi-TRP is not configured (single-TRP is configured). Different antenna port tables may only have some different entries.
- DMRS port combinations for rank 3 or 4 when multi-TRP is not configured may include only DMRS port combinations of category 3.
- DMRS port combinations for extension type 1 may include at least one DMRS port combination of ⁇ 0,1,8 ⁇ , ⁇ 0,1,8,9 ⁇ , ⁇ 2,3,10 ⁇ , and ⁇ 2,3,10,11 ⁇ .
- DMRS port combinations for extension type 2 may include at least one DMRS port combination of ⁇ 0,1,12 ⁇ , ⁇ 0,1,12,13 ⁇ , ⁇ 2,3,14 ⁇ , and ⁇ 2,3,14,15 ⁇ .
- DMRS port combinations for rank 3 or 4 when multi-TRP is not configured may include at least one of DMRS port combinations of category 1 and DMRS port combinations of category 2. In this case, there may be restrictions on at least one of the DMRS port combinations of category 1 and category 2.
- the DMRS port combination for rank 3 or 4 may be only DMRS port combination of category 3.
- the DMRS port combination for rank 3 or 4 may be only DMRS port combination across multiple CDM groups, or may include DMRS port combination across multiple CDM groups.
- the DMRS port combination for extended type 1 may include at least one DMRS port combination of ⁇ 0,1,2 ⁇ and ⁇ 0,1,2,3 ⁇ .
- the DMRS port combination for rank 3 or 4 may be only DMRS port combination across multiple CDM groups of category 3, or may include DMRS port combination across multiple CDM groups of category 3.
- the antenna port table for PDSCH may differ depending on whether a multi-TRP is configured.
- the antenna port table for PUSCH may differ depending on whether a multi-TRP is installed, or both the antenna port table for PDSCH and the antenna port table for PUSCH may differ.
- the number of rows (entries, antenna port field values) in the antenna port table and the size of the antenna port field may differ depending on whether or not multi-TRP is configured. For example, the number of rows in the antenna port table/number of bits in the antenna port field when multi-TRP is configured may be greater than the number of rows in the antenna port table/number of bits in the antenna port field when multi-TRP is not configured.
- This DMRS port combination is not multiplexed to another UE and FD-OCC is not actually used (FD-OCC[0 0 0 0] is applied), so it is effective for single-TRP as well, since it can prevent performance degradation even with strong frequency selectivity.
- the UE can be instructed on the appropriate DMRS port combination for Rel. 18 DMRS for multi-TRP/single-TRP.
- any information may be notified to the UE (from a network (NW) (e.g., a base station (BS))) (in other words, any information is received from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.
- NW network
- BS base station
- the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader that is not specified in existing standards.
- LCID Logical Channel ID
- the notification When the notification is made by a DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.
- RNTI Radio Network Temporary Identifier
- CRC Cyclic Redundancy Check
- notification of any information to the UE in the above-mentioned embodiments may be performed periodically, semi-persistently, or aperiodically.
- notification of any information from the UE (to the NW) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.
- physical layer signaling e.g., UCI
- higher layer signaling e.g., RRC signaling, MAC CE
- a specific signal/channel e.g., PUCCH, PUSCH, PRACH, reference signal
- the MAC CE may be identified by including a new LCID in the MAC subheader that is not specified in existing standards.
- the notification may be transmitted using PUCCH or PUSCH.
- notification of any information from the UE may be performed periodically, semi-persistently, or aperiodically.
- At least one of the above-mentioned embodiments may be applied when a specific condition is satisfied, which may be specified in a standard or may be notified to a UE/BS using higher layer signaling/physical layer signaling.
- At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.
- the specific UE capabilities may indicate at least one of the following: - Supporting specific processing/operations/control/information for at least one of the above embodiments. Supporting a greater number of DMRS ports for PDSCH/PUSCH than in existing specifications. - Support a greater number of DMRS ports than existing specifications by using TD-OCC/FD-OCC/FDM for DMRS of PDSCH/PUSCH. Supports FD OCC of length 4/6.
- the above-mentioned specific UE capabilities may be capabilities that are applied across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination of a cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities per Feature Set (FS) or Feature Set Per Component-carrier (FSPC).
- FR1 Frequency Range 1
- FR2 FR2, FR3, FR4, FR5, FR2-1, FR2-2
- SCS subcarrier Spacing
- FS Feature Set
- FSPC Feature Set Per Component-carrier
- the specific UE capabilities may be capabilities that are applied across all duplexing methods (commonly regardless of the duplexing method), or may be capabilities for each duplexing method (e.g., Time Division Duplex (TDD) and Frequency Division Duplex (FDD)).
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the above-mentioned embodiments may be applied when the UE configures/activates/triggers specific information related to the above-mentioned embodiments (or performs the operations of the above-mentioned embodiments) by higher layer signaling/physical layer signaling.
- the specific information may be information indicating that the functions of each embodiment are enabled, any RRC parameters for a specific release (e.g., Rel. 18/19), etc.
- the UE may, for example, apply Rel. 15/16 operations.
- a receiver that receives a first demodulation reference signal (DMRS) configuration to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied and receives a downlink control information format including an antenna port field;
- a terminal having a control unit that determines a combination corresponding to a value of the antenna port field based on an association between multiple combinations of multiple ports including a port of the first DMRS and multiple values of the antenna port field.
- DMRS demodulation reference signal
- FD-OCC frequency domain orthogonal cover code
- a receiver that receives a first demodulation reference signal (DMRS) configuration to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied and receives a downlink control information format including an antenna port field;
- a terminal having a control unit that determines a combination corresponding to a value of the antenna port field based on one of the following associations: a first association that associates multiple combinations of multiple ports including a port of the first DMRS and corresponding to multiple transmission/reception points with multiple values of the antenna port field; and a second association that associates multiple combinations of multiple ports including a port of the first DMRS and corresponding to one transmission/reception point with multiple values of the antenna port field.
- DMRS demodulation reference signal
- FD-OCC frequency domain orthogonal cover code
- [Appendix 2] The terminal according to claim 1, wherein the control unit uses the first association when the multiple transmission and reception points are set, and uses the second association when the multiple transmission and reception points are not set.
- [Appendix 3] The terminal described in Supplementary Note 1 or Supplementary Note 2, wherein at least one of the first association and the second association includes a combination of three or four ports including a port of the first DMRS and a port of a second DMRS to which an FD-OCC of length 2 is applied.
- [Appendix 4] 4 4. The terminal of any of claims 1 to 3, wherein the first association includes a combination of multiple ports across multiple code division multiplexing (CDM) groups.
- CDM code division multiplexing
- Wired communication system A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below.
- communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these.
- FIG. 12 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 (which may simply be referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) specified by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.
- LTE Long Term Evolution
- 3GPP Third Generation Partnership Project
- 5G NR 5th generation mobile communication system New Radio
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.
- E-UTRA Evolved Universal Terrestrial Radio Access
- EN-DC E-UTRA-NR Dual Connectivity
- NE-DC NR-E-UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN).
- the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (e.g., dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).
- dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).
- gNBs NR base stations
- N-DC Dual Connectivity
- the wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged within the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1.
- a user terminal 20 may be located within at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.
- the user terminal 20 may be connected to at least one of the multiple base stations 10.
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- Macro cell C1 may be included in FR1
- small cell C2 may be included in FR2.
- FR1 may be a frequency band below 6 GHz (sub-6 GHz)
- FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.
- the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication).
- wire e.g., optical fiber conforming to the Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication e.g., NR communication
- base station 11 which corresponds to the upper station
- IAB Integrated Access Backhaul
- base station 12 which corresponds to a relay station
- the base station 10 may be connected to the core network 30 directly or via another base station 10.
- the core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the core network 30 may include network functions (Network Functions (NF)) such as, for example, a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM).
- NF Network Functions
- UPF User Plane Function
- AMF Access and Mobility management Function
- SMF Session Management Function
- UDM Unified Data Management
- AF Application Function
- DN Data Network
- LMF Location Management Function
- OAM Operation, Administration and Maintenance
- the user terminal 20 may be a terminal that supports at least one of the communication methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the radio access method may also be called a waveform.
- other radio access methods e.g., other single-carrier transmission methods, other multi-carrier transmission methods
- a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- SIB System Information Block
- PDSCH User data, upper layer control information, System Information Block (SIB), etc.
- SIB System Information Block
- PUSCH User data, upper layer control information, etc.
- MIB Master Information Block
- PBCH Physical Broadcast Channel
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.
- DCI Downlink Control Information
- the DCI for scheduling the PDSCH may be called a DL assignment or DL DCI
- the DCI for scheduling the PUSCH may be called a UL grant or UL DCI.
- the PDSCH may be interpreted as DL data
- the PUSCH may be interpreted as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space may be used to detect the PDCCH.
- the CORESET corresponds to the resources to search for DCI.
- the search space corresponds to the search region and search method of PDCCH candidates.
- One CORESET may be associated with one or multiple search spaces. The UE may monitor the CORESET associated with a search space based on the search space configuration.
- a search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that the terms “search space,” “search space set,” “search space setting,” “search space set setting,” “CORESET,” “CORESET setting,” etc. in this disclosure may be read as interchangeable.
- the PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and a scheduling request (SR).
- UCI uplink control information
- CSI channel state information
- HARQ-ACK Hybrid Automatic Repeat reQuest ACKnowledgement
- ACK/NACK ACK/NACK
- SR scheduling request
- the PRACH may transmit a random access preamble for establishing a connection with a cell.
- downlink, uplink, etc. may be expressed without adding "link.”
- various channels may be expressed without adding "Physical” to the beginning.
- a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted.
- a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- a signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for PBCH) may be called an SS/PBCH block, an SS Block (SSB), etc.
- the SS, SSB, etc. may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS uplink reference signal
- DMRS may also be called a user equipment-specific reference signal (UE-specific Reference Signal).
- the base station 13 is a diagram showing an example of a configuration of a base station according to an embodiment.
- the base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks of the characteristic parts of this embodiment, and the base station 10 may also be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be configured from a controller, a control circuit, etc., which are described based on a common understanding in the technical field to which this disclosure pertains.
- the control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc.
- the control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc.
- the control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120.
- the control unit 110 may perform call processing of communication channels (setting, release, etc.), status management of the base station 10, management of radio resources, etc.
- the transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transceiver unit 120 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.
- the transceiver unit 120 may be configured as an integrated transceiver unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.
- the transmitting/receiving antenna 130 can be configured as an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.
- the transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.
- the transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transceiver 120 may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc., on data and control information obtained from the control unit 110, and generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transceiver 120 may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- channel coding which may include error correction coding
- DFT Discrete Fourier Transform
- IFFT Inverse Fast Fourier Transform
- the transceiver unit 120 may perform modulation, filtering, amplification, etc., on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.
- the transceiver unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.
- the transceiver 120 may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.
- reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.
- FFT Fast Fourier Transform
- IDFT Inverse Discrete Fourier Transform
- the transceiver 120 may perform measurements on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal.
- the measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc.
- RSRP Reference Signal Received Power
- RSSI Received Signal Strength Indicator
- the measurement results may be output to the control unit 110.
- the transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes providing NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.
- devices included in the core network 30 e.g., network nodes providing NF
- other base stations 10, etc. may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.
- the transmitter and receiver of the base station 10 in this disclosure may be configured with at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission path interface 140.
- the transceiver 120 may transmit a configuration of a first demodulation reference signal (DMRS) to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied, and may transmit a downlink control information format including an antenna port field.
- the control unit 110 may determine a combination corresponding to a value of the antenna port field based on an association between multiple combinations of multiple ports including the port of the first DMRS and multiple values of the antenna port field.
- the transceiver unit 120 may transmit a setting of a first demodulation reference signal (DMRS) to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied, and may transmit a downlink control information format including an antenna port field.
- the control unit 110 may determine a combination corresponding to a value of the antenna port field based on one of a first association that associates multiple combinations of multiple ports including a port of the first DMRS and corresponding to multiple transmission/reception points with multiple values of the antenna port field, and a second association that associates multiple combinations of multiple ports including a port of the first DMRS and corresponding to one transmission/reception point with multiple values of the antenna port field.
- the user terminal 14 is a diagram showing an example of the configuration of a user terminal according to an embodiment.
- the user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the control unit 210, the transceiver unit 220, and the transceiver antenna 230 may each include one or more.
- this example mainly shows the functional blocks of the characteristic parts of this embodiment, and the user terminal 20 may also be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be configured from a controller, a control circuit, etc., which are described based on a common understanding in the technical field to which this disclosure pertains.
- the control unit 210 may control signal generation, mapping, etc.
- the control unit 210 may control transmission and reception using the transceiver unit 220 and the transceiver antenna 230, measurement, etc.
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.
- the transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transceiver unit 220 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.
- the transceiver unit 220 may be configured as an integrated transceiver unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the reception unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.
- the transmitting/receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.
- the transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.
- the transceiver 220 may form at least one of the transmit beam and receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transceiver 220 may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data and control information acquired from the controller 210, and generate a bit string to be transmitted.
- RLC layer processing e.g., RLC retransmission control
- MAC layer processing e.g., HARQ retransmission control
- the transceiver 220 may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- Whether or not to apply DFT processing may be based on the settings of transform precoding.
- the transceiver unit 220 transmission processing unit 2211
- the transceiver unit 220 may perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, it is not necessary to perform DFT processing as the above-mentioned transmission processing.
- the transceiver unit 220 may perform modulation, filtering, amplification, etc., on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.
- the transceiver unit 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.
- the transceiver 220 may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.
- reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.
- the transceiver 220 may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal.
- the measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc.
- the measurement results may be output to the control unit 210.
- the transmitting unit and receiving unit of the user terminal 20 in this disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.
- the transceiver 220 may receive a first demodulation reference signal (DMRS) configuration to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied, and may receive a downlink control information format including an antenna port field.
- the control unit 210 may determine a combination corresponding to the value of the antenna port field based on an association between multiple combinations of multiple ports including the port of the first DMRS and multiple values of the antenna port field.
- the restriction on association of the port of the second DMRS to which the FD-OCC of length 2 is applied to the first DMRS with another terminal may not be applied.
- a different constraint may be applied to the first DMRS than the constraint on the association of the port of the second DMRS to which the FD-OCC of length 2 is applied with another terminal.
- the combination may include a port of the first DMRS and a port of a second DMRS to which an FD-OCC of length 2 is applied.
- the transceiver unit 220 may receive a setting of a first demodulation reference signal (DMRS) to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied, and may receive a downlink control information format including an antenna port field.
- the control unit 210 may determine a combination corresponding to a value of the antenna port field based on one of a first association that associates multiple combinations of multiple ports including a port of the first DMRS and corresponding to multiple transmission/reception points with multiple values of the antenna port field, and a second association that associates multiple combinations of multiple ports including a port of the first DMRS and corresponding to one transmission/reception point with multiple values of the antenna port field.
- the control unit 210 may use the first association when the multiple transmission/reception points are set, and may use the second association when the multiple transmission/reception points are not set.
- At least one of the first association and the second association may include a combination of three or four ports including a port of the first DMRS and a port of a second DMRS to which an FD-OCC of length 2 is applied.
- the first association may include a combination of multiple ports across multiple code division multiplexing (CDM) groups.
- CDM code division multiplexing
- each functional block may be realized using one device that is physically or logically coupled, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (for example, using wires, wirelessly, etc.).
- the functional blocks may be realized by combining the one device or the multiple devices with software.
- the functions include, but are not limited to, judgement, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment.
- a functional block (component) that performs the transmission function may be called a transmitting unit, a transmitter, and the like. In either case, as mentioned above, there are no particular limitations on the method of realization.
- a base station, a user terminal, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 15 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment.
- the above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.
- the terms apparatus, circuit, device, section, unit, etc. may be interpreted as interchangeable.
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figures, or may be configured to exclude some of the devices.
- processor 1001 may be implemented by one or more chips.
- the functions of the base station 10 and the user terminal 20 are realized, for example, by loading specific software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communications via the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.
- the processor 1001 for example, runs an operating system to control the entire computer.
- the processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, etc.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- etc. may be realized by the processor 1001.
- the processor 1001 also reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- the programs used are those that cause a computer to execute at least some of the operations described in the above embodiments.
- the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks.
- Memory 1002 is a computer-readable recording medium and may be composed of at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.
- ROM Read Only Memory
- EPROM Erasable Programmable ROM
- EEPROM Electrically EPROM
- RAM Random Access Memory
- Memory 1002 may also be called a register, cache, main memory, etc.
- Memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.
- Storage 1003 is a computer-readable recording medium and may be composed of at least one of a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium.
- Storage 1003 may also be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.
- the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the above-mentioned transmitting/receiving unit 120 (220), transmitting/receiving antenna 130 (230), etc. may be realized by the communication device 1004.
- the transmitting/receiving unit 120 (220) may be implemented as a transmitting unit 120a (220a) and a receiving unit 120b (220b) that are physically or logically separated.
- the input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside.
- the output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside.
- the input device 1005 and the output device 1006 may be integrated into one structure (e.g., a touch panel).
- each device such as the processor 1001 and memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between each device.
- the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using the hardware.
- the processor 1001 may be implemented using at least one of these pieces of hardware.
- a channel, a symbol, and a signal may be read as mutually interchangeable.
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may be composed of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting a radio frame may be called a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.
- the numerology may be a communication parameter that is applied to at least one of the transmission and reception of a signal or channel.
- the numerology may indicate, for example, at least one of the following: SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame configuration, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.
- SCS SubCarrier Spacing
- TTI Transmission Time Interval
- radio frame configuration a specific filtering process performed by the transceiver in the frequency domain
- a specific windowing process performed by the transceiver in the time domain etc.
- a slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.).
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a time unit based on numerology.
- a slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A.
- a PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.
- a radio frame, a subframe, a slot, a minislot, and a symbol all represent time units when transmitting a signal.
- a different name may be used for a radio frame, a subframe, a slot, a minislot, and a symbol, respectively.
- the time units such as a frame, a subframe, a slot, a minislot, and a symbol in this disclosure may be read as interchangeable.
- one subframe may be called a TTI
- multiple consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI.
- at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms.
- the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.
- TTI refers to, for example, the smallest time unit for scheduling in wireless communication.
- a base station schedules each user terminal by allocating radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units.
- radio resources such as frequency bandwidth and transmission power that can be used by each user terminal
- the TTI may be a transmission time unit for a channel-coded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc.
- the time interval e.g., the number of symbols
- the time interval in which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum time unit of scheduling.
- the number of slots (minislots) that constitute the minimum time unit of scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
- a TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.
- a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms
- a short TTI e.g., a shortened TTI, etc.
- TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
- the number of subcarriers included in an RB may be the same regardless of numerology, and may be, for example, 12.
- the number of subcarriers included in an RB may be determined based on numerology.
- an RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI in length.
- One TTI, one subframe, etc. may each be composed of one or more resource blocks.
- one or more RBs may be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.
- PRB Physical RB
- SCG sub-carrier Group
- REG resource element group
- PRB pair an RB pair, etc.
- a resource block may be composed of one or more resource elements (REs).
- REs resource elements
- one RE may be a radio resource area of one subcarrier and one symbol.
- a Bandwidth Part which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by an index of the RB relative to a common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within the BWP.
- the BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be configured for a UE within one carrier.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, and symbols are merely examples.
- the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.
- the information, parameters, etc. described in this disclosure may be represented using absolute values, may be represented using relative values from a predetermined value, or may be represented using other corresponding information.
- a radio resource may be indicated by a predetermined index.
- the names used for parameters and the like in this disclosure are not limiting in any respect. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure.
- the various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any respect.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies.
- the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.
- information, signals, etc. may be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input/output via multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input/output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.
- a specific location e.g., memory
- Input/output information, signals, etc. may be overwritten, updated, or added to.
- Output information, signals, etc. may be deleted.
- Input information, signals, etc. may be transmitted to another device.
- the notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods.
- the notification of information in this disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals, or a combination of these.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc.
- the RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.
- the MAC signaling may be notified, for example, using a MAC Control Element (CE).
- CE MAC Control Element
- notification of specified information is not limited to explicit notification, but may be implicit (e.g., by not notifying the specified information or by notifying other information).
- the determination may be based on a value represented by a single bit (0 or 1), a Boolean value represented by true or false, or a comparison of numerical values (e.g., with a predetermined value).
- Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
- Software, instructions, information, etc. may also be transmitted and received via a transmission medium.
- a transmission medium For example, if the software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave, etc.), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.
- wired technologies such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)
- wireless technologies such as infrared, microwave, etc.
- Network may refer to the devices included in the network (e.g., base stations).
- precoding "precoder,” “weight (precoding weight),” “Quasi-Co-Location (QCL),” “Transmission Configuration Indication state (TCI state),” "spatial relation,” “spatial domain filter,” “transmit power,” “phase rotation,” “antenna port,” “antenna port group,” “layer,” “number of layers,” “rank,” “resource,” “resource set,” “resource group,” “beam,” “beam width,” “beam angle,” “antenna,” “antenna element,” and “panel” may be used interchangeably.
- Base Station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.
- a base station can accommodate one or more (e.g., three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))).
- RRH Remote Radio Head
- the term "cell” or “sector” refers to a part or the entire coverage area of at least one of the base station and base station subsystems that provide communication services in this coverage.
- a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control/operate based on the information.
- MS Mobile Station
- UE User Equipment
- a mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc.
- at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.
- the moving body in question refers to an object that can move, and the moving speed is arbitrary, and of course includes the case where the moving body is stationary.
- the moving body in question includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and objects mounted on these.
- the moving body in question may also be a moving body that moves autonomously based on an operating command.
- the moving object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned).
- a vehicle e.g., a car, an airplane, etc.
- an unmanned moving object e.g., a drone, an autonomous vehicle, etc.
- a robot manned or unmanned
- at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- FIG. 16 is a diagram showing an example of a vehicle according to an embodiment.
- the vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.
- various sensors including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58
- an information service unit 59 including a communication module 60.
- the drive unit 41 is composed of at least one of an engine, a motor, and a hybrid of an engine and a motor, for example.
- the steering unit 42 includes at least a steering wheel (also called a handlebar), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.
- the electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., an Input/Output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle.
- the electronic control unit 49 may also be called an Electronic Control Unit (ECU).
- ECU Electronic Control Unit
- Signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the motor current, a rotation speed signal of the front wheels 46/rear wheels 47 acquired by a rotation speed sensor 51, an air pressure signal of the front wheels 46/rear wheels 47 acquired by an air pressure sensor 52, a vehicle speed signal acquired by a vehicle speed sensor 53, an acceleration signal acquired by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 acquired by a brake pedal sensor 56, an operation signal of the shift lever 45 acquired by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 58.
- the information service unit 59 is composed of various devices, such as a car navigation system, audio system, speakers, displays, televisions, and radios, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices.
- the information service unit 59 uses information acquired from external devices via the communication module 60, etc., to provide various information/services (e.g., multimedia information/multimedia services) to the occupants of the vehicle 40.
- various information/services e.g., multimedia information/multimedia services
- the information service unit 59 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that perform output to the outside.
- input devices e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.
- output devices e.g., a display, a speaker, an LED lamp, a touch panel, etc.
- the driving assistance system unit 64 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving load, such as a millimeter wave radar, a Light Detection and Ranging (LiDAR), a camera, a positioning locator (e.g., a Global Navigation Satellite System (GNSS)), map information (e.g., a High Definition (HD) map, an Autonomous Vehicle (AV) map, etc.), a gyro system (e.g., an Inertial Measurement Unit (IMU), an Inertial Navigation System (INS), etc.), an Artificial Intelligence (AI) chip, and an AI processor, and one or more ECUs that control these devices.
- the driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize a driving assistance function or an autonomous driving function.
- the communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63.
- the communication module 60 transmits and receives data (information) via the communication port 63 between the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 that are provided on the vehicle 40.
- the communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication.
- the communication module 60 may be located either inside or outside the electronic control unit 49.
- the external device may be, for example, the above-mentioned base station 10 or user terminal 20.
- the communication module 60 may also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it may function as at least one of the base station 10 and user terminal 20).
- the communication module 60 may transmit at least one of the signals from the various sensors 50-58 described above input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication.
- the electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input.
- the PUSCH transmitted by the communication module 60 may include information based on the above input.
- the communication module 60 receives various information (traffic information, signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle.
- the information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 60).
- the communication module 60 also stores various information received from external devices in memory 62 that can be used by the microprocessor 61. Based on the information stored in memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided on the vehicle 40.
- the base station in the present disclosure may be read as a user terminal.
- each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- the user terminal 20 may be configured to have the functions of the base station 10 described above.
- terms such as "uplink” and "downlink” may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink").
- the uplink channel, downlink channel, etc. may be read as the sidelink channel.
- the user terminal in this disclosure may be interpreted as a base station.
- the base station 10 may be configured to have the functions of the user terminal 20 described above.
- operations that are described as being performed by a base station may in some cases be performed by its upper node.
- a network that includes one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) or a Serving-Gateway (S-GW)), or a combination of these.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in this disclosure may be used alone, in combination, or switched between depending on the implementation.
- the processing procedures, sequences, flow charts, etc. of each aspect/embodiment described in this disclosure may be rearranged as long as there is no inconsistency.
- the methods described in this disclosure present elements of various steps using an exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4th generation mobile communication system 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG x is, for example, an integer or decimal
- Future Radio Access FX
- GSM Global System for Mobile communications
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX (registered trademark)
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth (registered trademark), and other appropriate wireless communication methods, as well as next-generation systems that are expanded, modified,
- the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using designations such as “first,” “second,” etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “determining” may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking in a table, database, or other data structure), ascertaining, etc.
- Determining may also be considered to mean “determining” receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.
- “Judgment” may also be considered to mean “deciding” to resolve, select, choose, establish, compare, etc.
- judgment may also be considered to mean “deciding” to take some kind of action.
- the "maximum transmit power" referred to in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.
- connection and “coupled,” or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected” may be read as "accessed.”
- a and B are different may mean “A and B are different from each other.”
- the term may also mean “A and B are each different from C.”
- Terms such as “separate” and “combined” may also be interpreted in the same way as “different.”
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Abstract
Selon un aspect de la présente divulgation, un terminal comprend : une unité de réception qui reçoit un réglage d'un premier signal de référence de démodulation (DMRS) auquel est appliqué un code de couverture orthogonal dans le domaine fréquentiel (FD-OCC) qui est plus long que 2 et qui reçoit un format d'informations de commande de liaison descendante contenant un champ de port d'antenne ; et une unité de commande qui détermine une combinaison correspondant à la valeur du champ de port d'antenne sur la base d'une association parmi une première association qui associe de multiples combinaisons de multiples ports contenant un port destiné au premier DMRS et correspondant à de multiples points d'émission/réception avec de multiples valeurs du champ de port d'antenne et une seconde association qui associe de multiples combinaisons de multiples ports contenant le port destiné au premier DMRS et correspondant à un point d'émission/réception avec de multiples valeurs du champ de port d'antenne.
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Non-Patent Citations (2)
Title |
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MIHAI ENESCU, NOKIA, NOKIA SHANGHAI BELL: "Rel-18 UL and DL DMRS Enhancements", 3GPP DRAFT; R1-2212170; TYPE DISCUSSION; NR_MIMO_EVO_DL_UL-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052222733 * |
SHINYA KUMAGAI, NTT DOCOMO, INC.: "Discussion on DMRS enhancements", 3GPP DRAFT; R1-2211972; TYPE DISCUSSION; NR_MIMO_EVO_DL_UL-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052222536 * |
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