WO2023188349A1 - 端末、無線通信方法及び基地局 - Google Patents
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- H—ELECTRICITY
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Definitions
- the present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).
- LTE Long Term Evolution
- 5G 5th generation mobile communication system
- 5G+ plus
- NR New Radio
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- the problem is how to control UL transmission (for example, timing advance control, etc.). If UL transmission to each transmission/reception point is not appropriately controlled, the quality of communication using multiple transmission/reception points may deteriorate.
- the present disclosure has been made in view of this point, and provides a terminal, a wireless communication method, and a base station that can appropriately communicate even when communicating using multiple transmission points. This is one of the purposes.
- a terminal includes a receiving unit that receives information regarding a timing advance group corresponding to a plurality of transmission and reception points of a specific cell, and a reception unit that receives information about a timing advance group corresponding to a plurality of transmission and reception points of a specific cell, and a reception unit that receives information about a timing advance group that corresponds to a plurality of transmission and reception points in a specific cell. and a control unit that controls timing advance of each of the plurality of transmission and reception points based on a timing advance command corresponding to the transmission and reception point or a timing advance command corresponding to the plurality of transmission points.
- communication can be performed appropriately even when communication is performed using a plurality of transmission points.
- FIGS. 1A to 1D are diagrams showing an example of a multi-TRP.
- 2A and 2B are diagrams illustrating an example of inter-cell mobility.
- FIG. 3 is a diagram illustrating an example of a timing advance group (TAG) to which cells included in a cell group belong.
- FIG. 4 is a diagram illustrating an example of a MAC CE for timing advance commands.
- FIG. 5 is a diagram illustrating an example of a case where multiple TRPs corresponding to a serving cell belong to different TAGs.
- FIG. 6 is a diagram illustrating an example of TAG settings according to the first embodiment.
- 7A and 7B are diagrams showing other examples of TAG settings according to the first embodiment.
- FIG. 8 is a diagram illustrating an example of an operation after the time alignment timer expires according to the first embodiment.
- FIG. 9 is a diagram showing another example of the operation after the time alignment timer expires according to the first embodiment.
- FIGS. 10A and 10B are diagrams illustrating an example of operations after the time alignment timer expires according to the second embodiment.
- FIG. 11 is a diagram illustrating an example of TAG settings according to the third embodiment.
- FIG. 12 is a diagram illustrating an example of TAG settings according to the fourth embodiment.
- FIG. 13 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 14 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- FIG. 15 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- FIG. 16 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- FIG. 17 is a diagram illustrating an example of a vehicle according to an embodiment.
- the UE performs reception processing (e.g. reception, demapping, demodulation, Controlling at least one of decoding), transmission processing (eg, at least one of transmission, mapping, precoding, modulation, and encoding) is being considered.
- reception processing e.g. reception, demapping, demodulation, Controlling at least one of decoding
- transmission processing e.g, at least one of transmission, mapping, precoding, modulation, and encoding
- the TCI states may represent those that apply to downlink signals/channels. What corresponds to the TCI state applied to uplink signals/channels may be expressed as a spatial relation.
- the TCI state is information regarding quasi-co-location (QCL) of signals/channels, and may also be called spatial reception parameters, spatial relation information, etc.
- the TCI state may be set 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, when one signal/channel and another signal/channel have a QCL relationship, the Doppler shift, Doppler spread, and average delay are calculated between these different signals/channels. ), delay spread, and spatial parameters (e.g., spatial Rx parameters) can be assumed to be the same (QCL with respect to at least one of these). You may.
- the spatial reception parameters may correspond to the UE's reception beam (eg, reception analog beam), and the beam may be identified based on the spatial QCL.
- QCL or at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).
- QCL types A plurality of types (QCL types) may be defined for QCL.
- QCL types A-D may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may be referred to as QCL parameters) are shown below: ⁇ QCL type A (QCL-A): Doppler shift, Doppler spread, average delay and delay spread, ⁇ QCL type B (QCL-B): Doppler shift and Doppler spread, ⁇ QCL type C (QCL-C): Doppler shift and average delay, - QCL type D (QCL-D): Spatial reception parameters.
- 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, It may also be called a QCL assumption.
- QCL Control Resource Set
- the UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for the signal/channel based on the TCI state 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 a target channel (in other words, a reference signal (RS) for the channel) and another signal (for example, another RS). .
- the TCI state may be set (indicated) by upper layer signaling, physical layer signaling, or a combination thereof.
- the upper layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a 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), or the like.
- Broadcast information includes, for example, a master information block (MIB), a system information block (SIB), a minimum system information (RMSI), and other system information ( Other System Information (OSI)) may also be used.
- MIB master information block
- SIB system information block
- RMSI minimum system information
- OSI Other System Information
- the physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- target channel/RS target channel/reference signal
- reference RS reference reference signal
- source RS source RS
- Channels for which TCI states or spatial relationships are set are, for example, the Physical Downlink Shared Channel (PDSCH), the Physical Downlink Control Channel (PDCCH), and the Uplink Shared Channel (PDSCH).
- the channel may be at least one of a Physical Uplink Shared Channel (PUSCH) and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- the RS that has a QCL relationship with the channel is, for example, a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding Reference Signal (SRS)), tracking CSI-RS (also called Tracking Reference Signal (TRS)), QCL detection reference signal (also called QRS), demodulation reference signal (DeModulation Reference Signal (DMRS)), etc. It may be one.
- SSB synchronization signal block
- CSI-RS channel state information reference signal
- SRS Sounding Reference Signal
- TRS Tracking Reference Signal
- QRS QCL detection reference signal
- DMRS Demodulation reference signal
- the 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 RS of QCL type X in a TCI state may mean an RS that has a QCL type It's okay.
- Multi TRP In NR, it is considered that one or more transmission/reception points (TRPs) (multi-TRP) perform DL transmission to the UE using one or more panels (multi-panel). has been done. Further, it is being considered that the UE performs UL transmission for one or more TRPs.
- TRPs transmission/reception points
- multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or may correspond to different cell IDs.
- the cell ID may be a physical cell ID (for example, PCI) or a virtual cell ID.
- FIGS. 1A-1D are diagrams illustrating an example of a multi-TRP scenario. In these examples, we assume, but are not limited to, that each TRP is capable of transmitting four different beams.
- FIG. 1A shows an example of a case (which may be called single mode, single TRP, etc.) in which only one TRP (TRP1 in this example) among multiple TRPs transmits to the UE.
- TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.
- PDCH control signal
- PDSCH data signal
- FIG. 1B shows a case in which only one TRP (TRP1 in this example) among multiple TRPs transmits a control signal to the UE, and the multiple TRP transmits a data signal (this may be called single master mode).
- TRP1 TRP1 in this example
- DCI downlink control information
- FIG. 1C shows an example of a case (which may be called master-slave mode) in which each of the multi-TRPs transmits a part of the control signal to the UE, and the multi-TRP transmits the data signal.
- Part 1 of the control signal (DCI) may be transmitted in TRP1
- part 2 of the control signal (DCI) may be transmitted in TRP2.
- Part 2 of the control signal may depend on part 1.
- the UE receives each PDSCH transmitted from the multi-TRP based on these DCI parts.
- FIG. 1D shows an example of a case in which each of the multi-TRPs transmits a separate control signal to the UE, and the multi-TRP transmits a data signal (which may be referred to as multi-master mode).
- a first control signal (DCI) may be transmitted in TRP1
- a second control signal (DCI) may be transmitted in TRP2.
- the UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.
- the DCI is a single DCI (S-DCI, single PDCCH). Furthermore, when multiple PDSCHs from multiple TRPs as shown in Figure 1D are scheduled using multiple DCIs, these multiple DCIs are called multiple DCIs (M-DCIs, multiple PDCCHs). You may be
- Different transport blocks (TB)/code words (CW)/different layers may be transmitted from each TRP of the multi-TRP.
- the same TB/CW/layer may be transmitted from each TRP of a multi-TRP.
- Non-Coherent Joint Transmission is being considered as a form of multi-TRP transmission.
- TRP1 modulates and layer maps a first codeword to a first number of layers (eg, 2 layers) to transmit a first PDSCH with a first precoding.
- TRP2 also performs modulation mapping and layer mapping of the second codeword to a second number of layers (eg, 2 layers) and transmits the second PDSCH using a second precoding.
- multiple PDSCHs to be NCJTed may be defined as partially or completely overlapping in at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap in at least one of time and frequency resources.
- first PDSCH and second PDSCH may be assumed not to be in a quasi-co-location (QCL) relationship.
- Reception of multiple PDSCHs may also be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).
- PDSCH transport block (TB) or codeword (CW) repetition across multiple TRPs
- repetition schemes URLLC schemes, e.g. Schemes 1, 2a, 2b, 3, 4
- SDM space division multiplexed
- FDM frequency division multiplexed
- RV redundancy version
- the RVs may be the same or different for multiple TRPs.
- multiple PDSCHs from multiple TRPs are time division multiplexed (TDM).
- TDM time division multiplexed
- multiple PDSCHs from multiple TRPs are transmitted within one slot.
- multiple PDSCHs from multiple TRPs are transmitted in different slots.
- NCJTs using multiple TRPs/panels may use higher ranks.
- single DCI single PDCCH, e.g., Figure 1B
- multi-DCI multiple PDCCH, e.g. , FIG. 1D
- the maximum number of TRPs may be two for both single DCI and multi-DCI.
- TCI expansion is being considered.
- Each TCI code point within the DCI may correspond to one or two TCI states.
- the TCI field size is Rel. It may be the same as No. 15.
- TRPInfo TRP information
- a CORESET pool index is set for each CORESET.
- TRPs transmission/reception points
- MTRPs Multi-TRPs
- the UE receives channels/signals from multiple cells/TRPs in inter-cell mobility (eg, L1/L2 inter-cell mobility) (see FIGS. 2A, B).
- inter-cell mobility eg, L1/L2 inter-cell mobility
- FIG. 2A shows an example of inter-cell mobility (for example, Single-TRP inter-cell mobility) including non-serving cells.
- the UE may be configured with one TRP (or single TRP) in each cell.
- the UE receives channels/signals from the base station/TRP of cell #1, which is the serving cell, and the base station/TRP of cell #3, which is not the serving cell (non-serving cell). It shows. For example, this corresponds to the case where the UE switches/switches from cell #1 to cell #3 (for example, fast cell switch).
- the serving cell TRP may be referred to as a primary TRP (eg, pTRP).
- the TRP of a non-serving cell may be referred to as an additional TRP (aTRP).
- port (for example, antenna port)/TRP selection may be performed dynamically. This may be done based on port (eg, antenna port)/TRP selection or TCI status indicated or updated by the DCI/MAC CE.
- port for example, antenna port
- TCI status indicated or updated by the DCI/MAC CE.
- different physical cell ID for example, PCI
- FIG. 2B shows an example of a multi-TRP scenario (for example, multi-TRP inter-cell mobility when using multi-TRP).
- the UE may be configured with multiple (eg, two) TRPs (or different CORESET pool indices) in each cell.
- TRP #1 corresponds to physical cell ID (PCI) #1
- TRP #2 corresponds to PCI #2.
- PCI physical cell ID
- the multi-TRPs may be connected by an ideal/non-ideal backhaul, and information, data, etc. may be exchanged.
- the same or different code words (CWs) and the same or different layers may be transmitted from each TRP of the multi-TRP.
- CWs code words
- CWs code words
- NCJT non-coherent joint transmission
- FIG. 2B a case is shown in which NCJT is performed between TPRs corresponding to different PCIs. Note that the same serving cell configuration may be applied/configured for TRP #1 and TRP #2.
- Multiple PDSCHs to be NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from TRP #1 and the second PDSCH from TRP #2 may overlap in at least one of time and frequency resources. The first PDSCH and the second PDSCH may be used to transmit the same TB, or may be used to transmit different TBs.
- first PDSCH and second PDSCH may be assumed not to be in a quasi-co-location (QCL) relationship.
- Reception of multiple PDSCHs may also be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode).
- DCI single DCI
- S-DCI single DCI
- PDCCH single PDCCH
- One DCI may be transmitted from one TRP of multiple TRPs.
- a configuration that uses one DCI in multi-TRP may be called single DCI-based multi-TRP (mTRP/MTRP).
- Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCH (multiple PDCCH)) (multimaster mode).
- M-DCI multiple DCI
- PDCCH multiple PDCCH
- a plurality of DCIs may be transmitted from multiple TRPs.
- a configuration that uses multiple DCIs in multi-TRP may be referred to as multi-DCI-based multi-TRP (mTRP/MTRP).
- CSI feedback may be called separate feedback, separate CSI feedback, or the like.
- "separate” may be mutually read as “independent.”
- TRPs Transmission Advance Group
- the distances between the UE and each TRP may be different.
- Multiple TRPs may be included in the same cell (eg, serving cell).
- a certain TRP may correspond to the serving cell, and other TRPs may correspond to the non-serving cells. In this case, it is also assumed that the distances between each TRP and the UE are different.
- the transmission timing of an UL (Uplink) channel and/or a UL signal (UL channel/signal) is adjusted by a timing advance (TA).
- TA timing advance
- the reception timing of UL channels/signals from different user terminals (UE) is adjusted on the radio base station (TRP: Transmission and Reception Point, gNB: gNodeB, etc.) side.
- the UE may control the timing of UL transmission by applying timing advances (multiple timing advances) to each timing advance group (TAG) set in advance.
- TAG timing advance group
- TAGs support timing advance groups classified by transmission timing.
- the UE may control the UL transmission timing in each TAG assuming that the same TA offset (or TA value) is applied for each TAG. That is, the TA offset may be set independently for each TAG.
- the UE When multiple timing advance is applied, the UE independently adjusts the transmission timing of cells belonging to each TAG, so that even when multiple cells are used, the radio base station receives uplink signal reception timing from the UE. can be matched.
- the TAG (for example, serving cells belonging to the same TAG) may be configured by upper layer parameters.
- the same timing advance value may be applied to serving cells belonging to the same TAG.
- a timing advance group including the MAC entity SpCell may be referred to as a primary timing advance group (PTAG), and other TAGs may be referred to as a secondary timing advance group (STAG).
- PTAG primary timing advance group
- STAG secondary timing advance group
- FIG. 3 shows a case where three TAGs are set for a cell group including SpCell and SCells #1 to #4.
- SpCell and SCell #1 belong to the first TAG (PTAG or TAG #0)
- SCell #2 and SCell #3 belong to the second TAG (TAG #1)
- SCell #4 belongs to the third TAG. This shows the case where it belongs to TAG (TAG #2).
- a timing advance command may be notified to the UE using a MAC control element (for example, MAC CE).
- the TA command is a command indicating an uplink channel transmission timing value, and is included in the MAC control element.
- the TA command is signaled from the radio base station to the UE at the MAC layer.
- the UE controls a predetermined timer (eg, TA timer) based on reception of the TA command.
- the MAC CE for timing advance commands may include a field for timing advance group index (for example, TAG ID) and a field for timing advance commands (see FIG. 4). .
- TAG-IDs are set for one or more TRPs corresponding to a certain cell (or CC).
- a case is also assumed in which different TRPs corresponding to a certain cell share a common TAG.
- a case in which the MAC CE for the TA command is applied to only one TRP, or a case in which the MAC CE for the TA command is applied to multiple TRPs is also assumed.
- UL transmission is controlled based on timing advance for the serving cell (or the TRP of the serving cell) and the non-serving cell (or the TRP of the non-serving cell).
- a time alignment timer (for example, timeAlignmentTimer) may be set for each TRP.
- the time alignment timer may control the time at which the MAC entity considers serving cells belonging to the associated TAG to be uplink time aligned.
- a time alignment timer may be set by the RRC to maintain (eg, maintenance) UL time alignment.
- a time alignment timer (e.g. timeAlignmentTimer) may be maintained for UL time alignment. Rel. At 17, a time alignment timer (eg, timeAlignmentTimer) corresponds to each TAG.
- a time alignment timer (eg, timeAlignmentTimer) corresponds to each TAG.
- the UE receives a MAC CE for a timing advance command (e.g., TAC MAC CE)
- the UE starts or restarts the time alignment timer respectively associated with the indicated timing advance group (e.g., TAG).
- the MAC entity If the MAC entity receives the TAC MAC CE and maintains a predetermined value (N TA ) with the indicated TAG, the MAC entity applies a timing advance command for the indicated TAG, or Start or restart the time alignment timer associated with the TAG.
- the predetermined value (N TA ) may be a timing advance between DL and UL.
- TAG timing advance group
- PTAG primary timing advance group
- STAG secondary timing advance group
- the following operations eg, predetermined PTAG operation/predetermined STAG operation
- predetermined PTAG operation/predetermined STAG operation may be performed.
- Predetermined PTAG operation If the time alignment timer is associated with PTAG, - Flush all HARQ buffers of all serving cells. - If configured, notify RRC to release PUCCH for all serving cells. - If set, notify RRC to release SRS. - Clear all set DL assignments and set UL assignments. - Clear the PUSCH resource for semi-persistent CSI reporting. ⁇ Let all time alignment timers expire while running. - Maintain NTA for all TAGs.
- Predetermined STAG operation When a time alignment timer is associated with a STAG, for all serving cells belonging to the TAG, - Flush all HARQ buffers. - If set, notify RRC to release PUCCH. - If set, notify RRC to release SRS. - Clear all set DL assignments and UL assignments. - Clear the PUSCH resource for semi-persistent CSI reporting. - Maintain the NTA of the TAG.
- TRP/TA control for each panel As described above, when communicating using multiple transmission/reception points (for example, TRPs)/panels, it is also assumed that timing advance is controlled for each TRP/panel.
- TA may be applied to each TRP (or instructions may be given in TRP/TA units). For example, at least one of the following options may be applied:
- a different TAG-ID may be set for each TRP, and a different TA command MAC CE may be set for each TRP.
- Each TAG may maintain a time alignment timer for UL time alignment.
- Different TRPs may share a TAG.
- the MAC CE for TA commands may be applied to only one TRP.
- the UE applies different TAs for other TRPs. For example, the UE may adjust the TA value for another TRP (for example, TRP #1) using a TA offset (TA_TRP_offset) based on the TA for TRP #0 (TA_TRP #0).
- TRP #1 TA offset
- TRP #0 TA_TRP #0
- only one time alignment timer may exist for UL time alignment of multiple TRPs. This may mean that the UL time alignment of multiple TRPs is maintained or lost simultaneously.
- the MAC CE for TA commands may be applied to multiple serving TRPs for the UE.
- the MAC CE for TA commands received on a TRP/CW/PDSCH/DMRS port group may be applied to the same TRP/CW/PDSCH/DMRS port group of the TAG.
- Each TRP/CW/PDSCH/DMRS port group of the TAG maintains a time alignment timer for UL time alignment.
- a case is assumed in which multiple (for example, two) TRPs of a serving cell belong to different TAGs. Rel. In No. 17, a TAG including SpCell of the MAC entity corresponds to a PTAG, and other TAGs correspond to a STAG. Furthermore, the operations when the time alignment timer expires are defined differently for PTAG and STAG.
- TRP#0 of SpCell and TRP#0 of SCell#1 belong to the same TAG group (TAG ID#0), and TRP#1 of SpCell and TRP#1 of SCell#1 belong to the same TAG group (TAG ID#0). #1) is shown.
- TAG corresponds to a PTAG or how to control the UE operation in each TAG when the time alignment timer expires.
- TAC MAC CE timing advance command MAC CE
- the UE applies the TAC MAC CE to only one TRP to adjust the timing advance (e.g., TA_0) of that TRP, and for other TRPs, uses an offset based on TA_0 to adjust the timing advance (e.g., TA_1). ) may be adjusted/controlled.
- TA_1 may be obtained, for example, by TA_0+offset.
- the offset may be instructed from the base station to the UE using RRC/MAC CE/DCI.
- the question is whether to support a time alignment timer for each TRP, or whether to start/restart the timer based on an offset instruction.
- TAC timing advance command MAC CE
- the problem is how to control the UE operation for each TRP when the time alignment timer expires.
- the question is whether multiple TRPs from multiple cells can share the same TA command/same time alignment timer, or if they can, the TAG settings.
- the present inventors focused on analyzes 1 to 4 when using multiple TRPs/panels, and controlled timing advance for at least one of analyzes 1 to 4 (for example, timing advance adjustment/TAG setting/timing
- the present embodiment was conceived by considering the following: (operation based on the advanced timer, etc.).
- A/B may mean “at least one of A and B", or may be read as A and B, A or B.
- A/B/C may mean “at least one of A, B, and C,” or may be read as A, B, and C, A, B, or C. good.
- cell serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read interchangeably.
- index, ID, indicator, and resource ID may be interchanged.
- support may be used interchangeably.
- the upper layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- RRC, RRC signaling, RRC parameters, upper layer, upper layer parameters, RRC information elements (IEs), and RRC messages may be read interchangeably.
- the MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), or the like.
- Broadcast information includes, for example, a master information block (MIB), a system information block (SIB), a minimum system information (RMSI), and other system information ( Other System Information (OSI)) may also be used.
- MIB master information block
- SIB system information block
- RMSI minimum system information
- OSI Other System Information
- the assumed QCL type A RS, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be read interchangeably. good.
- QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type good may be read interchangeably.
- a panel an Uplink (UL) transmitting entity, a TRP, a spatial relationship, a control resource set (COreSET), a PDSCH, a codeword, a base station, an antenna port of a certain signal (e.g., a demodulation reference signal (DeModulation Reference Signal (DMRS) port), antenna port group for a certain signal (e.g. DMRS port group), group for multiplexing (e.g. Code Division Multiplexing (CDM)) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), and layer (MIMO layer, transmission layer, spatial layer) may be read interchangeably.
- a certain signal e.g., a demodulation reference signal (DeModulation Reference Signal (DMRS) port
- DMRS port group e.g. DMRS port group
- group for multiplexing e.g. Code Division Multiplexing (CDM)
- reference signal group e.g. Code Division Multiple
- the panel identifier (ID) and the panel may be read interchangeably.
- TRP ID, TRP related ID, CORESET pool index, position of one TCI state of two TCI states corresponding to one code point of a field in DCI (ordinal, first TCI state or second TCI state) ) and TRP may be read interchangeably.
- a panel, UE panel, RS port group, DMRS port group, SRS port group, RS resource group, DMRS resource group, SRS resource group, beam group, TCI state group, spatial relationship group, SRS resource indicator (SRI) Group, antenna port group, antenna group, and CORESET group may be read interchangeably.
- a panel may be associated with at least one of a panel ID, UL TCI status, UL beam, DL beam, DL RS resource, and spatial relationship information.
- multiple TRPs multiple TRP systems, multiple TRP transmissions, multiple PDSCHs, channels using multiple TRPs, channels using multiple TCI state/spatial relationships, multiple TRPs enabled by RRC/DCI, multiple The fact that the TCI state/space relationship is enabled by RRC/DCI, and at least one of multi-TRP based on single DCI and multi-TRP based on multi-DCI may be read interchangeably.
- multiple TRPs based on multiple DCIs and a CORESET pool index (CORESETPoolIndex) value of 1 being set for a CORESET may be read interchangeably.
- multiple TRPs based on a single DCI, at least one code point of a TCI field being mapped to two TCI states may be read interchangeably.
- CORESETPoolIndex CORESET Pool Index
- signaling configuration may be read interchangeably.
- At least one of information regarding the TRP corresponding to the serving cell and information regarding the TAG corresponding to each TRP may be set/notified from the base station to the UE.
- the base station may set at least one of information regarding the TRP included in the serving cell and information regarding the TAG corresponding to each TRP to the UE using RRC parameters.
- the base station may use the MAC CE to set at least one of information regarding the TRP included in the serving cell and information regarding the TAG corresponding to each TRP to the UE.
- the base station may set information regarding the TRPs included in the serving cell using RRC parameters, and notify the UE of information regarding the TAG corresponding to each TRP using MAC CE.
- the UE controls the UL transmission timing (for example, adjusts the timing advance) corresponding to each TRP in consideration of the TAG to which the plurality of TRPs corresponding to the serving cell belong.
- the UE may control timing advances based on time alignment timers corresponding to each TRP.
- the UE determines the number of timing advance timers that expire at the same time/type of TAG (PTAG or STAG) for which the timing advance timer expires/timing advance.
- the operation after the timing advance timer expires may be determined/controlled based on the type of cell included in the TAG for which the timer expires (for example, whether SpCell is included or not).
- first embodiment timing advance control in a case where multiple (for example, two) TRPs of a serving cell belong to different TAGs will be described. Note that the first embodiment may be suitably applied to the configuration shown in Analysis 1 above. Of course, the cases to which the first embodiment is applied are not limited to this.
- the time alignment timer may be set/maintained for each TAG.
- two TRPs eg, TRP#0 and TRP#1
- may correspond to different CORESET pool indexes eg, ⁇ 0, 1 ⁇ ).
- TAG for example, PTAG/STAG or TAG ID
- the predetermined conditions include cell type/cell index (for example, SPCell or SCell), TRP index (for example, TRP#0 or TRP#1), and cell type/cell index and TRP index. It may be a combination of at least one of the following.
- At least one of the following options 1-1 to 1-4 may be applied as the setting of the TAG to which multiple TRPs of each serving cell belong.
- a TAG including the TRP of a specific cell may be defined/configured as a PTAG.
- a TAG including TRP#0 of SpCell of the MAC entity may be defined/set as a PTAG.
- the UE may apply certain actions for the PTAG if the time alignment timer for the TAG expires.
- the operation for a predetermined PTAG is, for example, Rel.
- the operation may be applied when the time alignment timer for PTAG defined in No. 17 expires.
- the operation is not limited to this, and the predetermined PTAG operation may be, for example, Rel.
- the operation may be applied when a time alignment timer for a PTAG defined in 18 or later has expired.
- the TAG including TRP#1 of SpCell of the MAC entity may also be defined/set as PTAG (see FIG. 6).
- the UE may apply certain actions for the PTAG if the time alignment timer for the TAG expires.
- a TAG that does not include the TRP of SpCell may be defined/set as a STAG.
- a TAG containing a specific TRP of a specific cell may be defined/configured as a PTAG. Further, a TAG including a TRP other than a specific TRP of a specific cell may be defined/set as a STAG.
- a TAG that includes a TRP of a specific index (for example, TRP #0) of SpCell of a MAC entity may be defined/set as a PTAG.
- the UE may apply certain actions for the PTAG if the time alignment timer for the TAG expires.
- a TAG that includes a TRP (for example, TRP #1) with an index other than the specific index of SpCell of the MAC entity may be defined/set as a STAG (see FIG. 7A).
- the UE may apply certain STAG operations when the time alignment timer for the TAG expires.
- the predetermined STAG operation may be, for example, Rel.
- the operation may be applied when the time alignment timer for STAG defined in No. 17 expires.
- the predetermined STAG operation may be, for example, Rel.
- the operation may be applied when the time alignment timer for STAG defined in 18 or later expires.
- the TAG including TRP#0 of SpCell is defined/set as PTAG
- the TAG including TRP#1 of SpCell is defined/set as STAG
- the present invention is not limited to this.
- the TAG including TRP#0 of a specific cell may be defined/set as STAG
- the TAG including TRP#1 may be defined/set as PTAG (see FIG. 7B).
- a single PTAG or the definition/configuration of a single PTAG may be supported for a certain cell group (for example, MCG/SCG). Further, a TAG that does not include a specific TRP of SpCell may be defined/set as a STAG.
- TAG of SpCell includes which TRP is referred to as PTAG.
- information regarding TRP corresponding to PTAG may be set/notified from the base station to the UE using RRC/MAC CE or the like.
- a restriction may be added that only one of the TRPs can be set as a PTAG.
- the UE may apply PTAG operations (for example, a predetermined PTAG operation after the time alignment timer expires). Otherwise, the UE may apply STAG actions (eg, predetermined STAG actions after the time alignment timer expires).
- PTAG operations for example, a predetermined PTAG operation after the time alignment timer expires.
- STAG actions eg, predetermined STAG actions after the time alignment timer expires.
- TAG may be set from the base station to the UE.
- information regarding a TAG corresponding to a PTAG may be set/notified from a base station to a UE using RRC/MAC CE or the like.
- a restriction may be added that the number of TAGs that can be set as PTAG in each cell group (for example, MCG/SCG) is less than or equal to a predetermined number (for example, only one).
- the number of TAGs that can be set as PTAGs does not need to be limited.
- a plurality of TAGs (for example, two) may be configurable as a PTAG.
- a new operation may be defined/applied as an operation after expiration of the time alignment timer corresponding to each TAG.
- FIG. 8 shows a case where time alignment timers are set separately for TAG #0 including TRP #0 of SpCell and SCell #1, and TAG #1 including TRP #1 of SpCell and SCell #2. ing.
- the UE determines the number of timing advance timers expiring at the same time, the type of TAG for which the timing advance timer expires (PTAG or STAG), the type of cells included in the TAG for which the timing advance timer expires (e.g. SpCell included).
- the operation after the timing advance timer expires may be determined/controlled based on at least one of the following.
- a predetermined PTAG operation may be applied only when both the time alignment timer corresponding to TAG #0 and the time alignment timer corresponding to TAG #1 expire.
- the UE may control to apply a predetermined PTAG operation to both TAG #0 and TAG #1.
- TAG#0 and TAG#1 are PTAG
- a predetermined operation for PTAG is applied
- one of TAG#0 and TAG#1 is PTAG and the other is STAG
- a predetermined operation for PTAG is applied.
- Operations for PTAG may be applied
- predetermined operations for STAG may be applied for STAG.
- a predetermined STAG operation may be applied to the TAG for which the time alignment timer has expired. For example, if the time alignment timer corresponding to TAG #0 (e.g. PTAG) has expired and the time alignment timer corresponding to TAG #1 (e.g. STAG) is running, then TAG #0 (e.g. PTAG) Predetermined STAG operations may be applied.
- TAG #0 e.g. PTAG
- Predetermined STAG operations may be applied.
- the behavior for a given STAG regardless of the TAG type (PTAG or STAG). may be applied.
- the time alignment timer for a predetermined TAG may not apply to a given serving cell (eg, SpCell).
- the TRP whose time alignment timer has expired may be considered asynchronous.
- a random access operation eg, RACH procedure
- RACH procedure may be initiated for synchronization.
- a configuration may also be adopted in which a predetermined TAG (PTAG/STAG) operation is not applied to a specific cell (for example, SpCell).
- a predetermined TAG (PTAG/STAG) operation is not applied to a specific cell (for example, SpCell).
- a specific cell for example, SpCell.
- the predetermined STAG operation is applied to SCell #1.
- the predetermined STAG operation is applied to SCell #2, and the time alignment timer corresponding to TAG #0 is running. It does not have to be applied.
- the time alignment timer may be set based on whether the TAG for which the time alignment timer expired contains a particular cell (e.g., SpCell). Operations regarding the TAG may be controlled.
- a particular cell e.g., SpCell
- predetermined PTAG operations may be applied.
- predetermined STAG operations may be applied.
- the predetermined TAG (PTAG/STAG) operation is applied. You don't have to.
- the TRP whose time alignment timer has expired is considered asynchronous, and a random access operation (eg, RACH procedure) may be initiated for synchronization.
- a predetermined STAG operation is applied to SCell #2. , may not be applied to SCell #1.
- the first embodiment may be applied in L1/L2 inter-cell operation (for example, L1/L2 inter-cell operation).
- the first embodiment may be applied to case).
- TRP may be replaced with "PCI” and applied.
- the M PCIs of the serving cell may belong to different TAGs. In this case, the following options 1-1' to 1-4' may be applied. M may be 2 or a value larger than 2.
- a TAG including the PCI of SpCell of the MAC entity may be defined/configured as a PTAG.
- the UE may apply certain actions for the PTAG if the time alignment timer for the TAG expires. This may mean that there are multiple PTAGs in a cell group (eg, MCG/SCG).
- a TAG including the PCI of SpCell of the MAC entity may be defined/configured as a PTAG.
- the UE may apply certain actions for the PTAG if the time alignment timer for the TAG expires.
- a TAG that includes other PCIs (for example, additional PCIs) of the SpCell of the MAC entity may be defined/configured as a STAG.
- the UE may apply a predetermined operation for the STAG when the time alignment timer for the STAG expires.
- PTAG The TAG including which PCI of SpCell is referred to as PTAG may be set.
- a restriction may be added that only one PCI (or a maximum of N PCIs) can be configured as a PTAG.
- the UE may apply PTAG operations (for example, a predetermined PTAG operation after the time alignment timer expires). Otherwise, the UE may apply STAG actions (eg, predetermined STAG actions after the time alignment timer expires).
- PTAG operations for example, a predetermined PTAG operation after the time alignment timer expires.
- STAG actions eg, predetermined STAG actions after the time alignment timer expires.
- Which TAG to refer to as PTAG may be set from the base station to the UE.
- a restriction may be added that the number of TAGs that can be set as PTAG in each cell group (for example, MCG/SCG) is less than or equal to a predetermined number (for example, only one or at most N).
- the number of TAGs that can be set as PTAGs does not need to be limited. Multiple (eg, two or any number) TAGs may be configurable as a PTAG.
- New operations may be defined/applied as operations on TAGs (eg, PTAG/STAG) related to time alignment timers.
- the UE may apply the predetermined PTAG actions only when all time alignment timers have expired.
- a predetermined STAG operation may be applied to the TAG for which the time alignment timer has expired.
- the time alignment timer for a predetermined TAG may not be applied to the serving cell (eg, SPCell).
- the PCI whose time alignment timer has expired is considered asynchronous, and a random access operation (eg, RACH procedure) may be initiated for synchronization.
- RACH procedure eg, RACH procedure
- ⁇ Second embodiment> timing advance control will be described when a plurality of (for example, two) TRPs of a serving cell belong to the same TAG. Note that the second embodiment may be suitably applied to the configuration shown in Analysis 2 above. Of course, the cases to which the second embodiment is applied are not limited to this.
- the MAC CE for TA commands may be indicated/applied to only one TRP.
- the TA command MAC CE may be instructed/applied to TRP#0.
- the timing advance applied to TRP#0 may be referred to as TA_0.
- the UE may adjust the timing advance using an offset based on TA_0.
- the timing advance applied to TRP #1 may be referred to as TA_1.
- TA_1 TA_0+offset.
- information regarding the offset may be notified from the base station to the UE.
- the timing advance timer may be set/applied to each TRP in common, or may be set/applied separately.
- the UE may apply at least one of the following options 2-1 to 2-2 to adjust/control the timing advance.
- Two TRPs may share one time alignment timer (see Figure 10A).
- the UE may not affect the time alignment timer (Alt. 2-1-1). For example, even if the UE receives information regarding the offset while the time alignment timer is running, the UE may continue to apply the time alignment timer (without resetting it) and may not reflect the content of the offset. In this case, the time alignment timer may expire and the offset may be reflected in the time alignment timer applied thereafter.
- the UE may control the time alignment timer to start/restart/reset (Alt. 2-1-2 ). In this case, it becomes possible to flexibly change the timing advance for TRP #1.
- a predetermined PTAG operation may be applied.
- a first time alignment timer may be applied/maintained for the TPR (eg, TRP #0) whose TA is adjusted by the MAC CE for TA commands.
- the first time alignment timer may be, for example, a time alignment timer supported by existing systems (eg, Rel.17/Rel.16).
- a second time alignment timer may be applied/maintained to the TRP (for example, TRP #1) whose TA is adjusted by the offset (see FIG. 10B).
- the second time alignment timer may be a new timer.
- the UE may control the new timer to be disclosed/restarted/reset. If the new timer expires, the TRP (eg, TRP #1) may be considered asynchronous. In this case, the UE may control to start a random access operation (eg, RACH procedure) for synchronization.
- a random access operation eg, RACH procedure
- the second embodiment may be applied in L1/L2 inter-cell operation (for example, L1/L2 inter-cell operation).
- the second embodiment may be applied to the case).
- TRP becomes “PCI”
- 2TRP/PCI becomes “multiple (for example, 2 or more) PCI”
- TRP#0 becomes “serving PCI”.
- “, and "TRP#1” may be read and applied as "other PCI/additional PCI", respectively.
- ⁇ Third embodiment> when multiple (for example, two) TRPs of a serving cell belong to the same TAG and the TA command MAC CE instructs TAC for each TRP (or TAC for each TRP), the timing advance is Control will be explained. Note that the third embodiment may be suitably applied to the configuration shown in Analysis 3 above. Of course, the cases to which the third embodiment is applied are not limited to this.
- TAC MAC CE instructs each TRP TAC (for example, instructs TAC for each TRP). ) may be done.
- Each TRP may maintain a separate time alignment timer (see FIG. 11).
- the UE determines the number of timing advance timers expiring at the same time, the type of TAG for which the timing advance timer expires (PTAG or STAG), the type of cells included in the TAG for which the timing advance timer expires (e.g. SpCell included).
- the operation after the timing advance timer expires may be determined/controlled based on at least one of the following.
- the UE when both of the two time alignment timers expire, the UE performs an operation for a predetermined TAG (for example, a predetermined PTAG/predetermined STAG operation) for TAG#0. operation) may be applied.
- a predetermined TAG for example, a predetermined PTAG/predetermined STAG operation
- the UE may apply at least one of the following options 3-1 to 3-2.
- the UE may control to apply a predetermined TAG operation (for example, a predetermined PTAG operation) to a TAG (for example, TAG #0) that includes a TRP whose time alignment timer has expired. good.
- a predetermined TAG operation for example, a predetermined PTAG operation
- TAG #0 a TAG that includes a TRP whose time alignment timer has expired.
- a predetermined PTAG operation may be applied to the TAG. That is, when the time alignment timer of at least one TRP included in a TAG expires, a predetermined PTAG operation may be applied to the TAG (or multiple TRPs included in the TAG). Note that option 3-1 may be applied when the time alignment timer of a specific TRP among the TRPs included in the TAG expires.
- the UE may control not to apply a predetermined TAG operation (for example, a predetermined PTAG operation) to a TAG (for example, TAG #0) that includes a TRP whose time alignment timer has expired. good. In other words, if at least one TRP included in the TAG is running, the predetermined PTAG operation may not be performed.
- a predetermined TAG operation for example, a predetermined PTAG operation
- the UE may control the UE not to perform the predetermined PTAG operation.
- the UE may control the UE not to perform the predetermined PTAG operation.
- TRPs whose time alignment timers have expired are considered to be asynchronous (or unsynchronized), and a RACH operation may be initiated to synchronize the TRPs.
- TAG is a PTAG (case 3-1B) and the case where the TAG is a STAG (case 3-2B).
- all TRPs sharing the same time alignment timer may be considered asynchronous if the time alignment timer expires.
- the third embodiment may be applied in L1/L2 inter-cell operation (for example, L1/L2 inter-cell operation).
- M physical cell IDs
- M 2 in multi-TRP inter-cell operation using multi-DCI.
- the third embodiment may be applied to the case).
- TRP becomes “PCI”
- 2TRP/PCI becomes “multiple (for example, 2 or more) PCIs”
- TRP#0 becomes “serving PCI”
- TRP#1 may be read and applied as "other PCI/additional PCI” respectively.
- ⁇ Fourth embodiment> timing advance control will be described when a plurality of (for example, two) TRPs of a serving cell belong to the same TAG and a TA command MAC CE instructs TAC for each TRP.
- the fourth embodiment may be suitably applied to the configuration shown in Analysis 4 above. Of course, the cases to which the fourth embodiment is applied are not limited to this.
- the TAC MAC CE may instruct the TAC for each TRP.
- Each TRP may each maintain a time alignment timer.
- TRPs from multiple cells may be supported to share the same TA command/same time alignment timer.
- a sub-TAG eg, sub-TAG
- One or more sub-TAGs may be included in one TAG.
- TRPs belonging to the same sub-TAG may share the same TA command/same time alignment timer.
- the TAG to which the sub-TAG is set may be limited to a specific type of TAG (for example, PTAG).
- the TAG to which the sub-TAG is set may be set regardless of the type of TAG (both PTAG and STAG).
- the UE may apply at least one of the following options 4-1 to 4-2.
- the TRP belonging to the sub-TAG may be determined.
- TRP #0 of all serving cells within the same TAG may share the same TA command/same time alignment timer, and the TRP #0 may belong to the same sub-TAG.
- TRP #1 of all serving cells within the same TAG may share the same TA command/same time alignment timer, and the TRP #1 may belong to the same sub-TAG (see FIG. 12).
- FIG. 12 may be a default setting.
- the serving cell shares the same TA command/same time alignment timer as the specific TRP (e.g. TRP#0) and It may be configured to belong to the same TAG as the TRP (for example, TRP #0).
- the serving cell may share the same TA command/same time alignment timer for which TRP may be configured, and may belong to a TAG for which sub-TAGs may be configured.
- the third embodiment may be applied in L1/L2 inter-cell operation (for example, L1/L2 inter-cell operation).
- a case where up to M physical cell IDs e.g., PCI
- the fourth embodiment may be applied to case).
- TRP becomes “PCI”
- 2TRP/PCI becomes “multiple (for example, 2 or more) PCIs”
- TRP#0 becomes “serving PCI”
- TRP#1 is set to “Other PCI/Additional PCI”
- M-TRP not set is set to “Multiple PCIs are not set (or inter-cell operation is not set)”
- M-TRP is not set may be read and applied as "Only one PCI is configured.”
- the following UE capabilities may be set.
- the following UE capabilities may be read as parameters (eg, upper layer parameters) that are set in the UE from the network (eg, base station).
- UE capability information regarding whether to support different TAs for the two TRPs of the serving cell may be defined.
- UE capability information regarding the maximum number of different TAs supported in all serving cells may be defined.
- the first to fourth embodiments may be configured to be applied to a UE that supports/reports at least one of the above-mentioned UE capabilities.
- the first to fourth embodiments may be configured to be applied to a UE configured from a network.
- wireless communication system The 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-described embodiments of the present disclosure or a combination thereof.
- FIG. 13 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC has dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)).
- RATs Radio Access Technologies
- MR-DC has dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)).
- 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 (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the NR base station (gNB) is the MN
- the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) where both the MN and SN are NR base stations (gNB)). )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) where both the MN and SN are NR base stations (gNB)).
- the wireless communication system 1 includes a base station 11 that forms a macro cell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are located within the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. You may prepare.
- User terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.
- the user terminal 20 may be connected to at least one of the plurality of base stations 10.
- the user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of 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 FR1 may correspond to a higher frequency band than FR2, for example.
- 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 plurality of base stations 10 may be connected by wire (for example, optical fiber, X2 interface, etc. compliant with Common Public Radio Interface (CPRI)) or wirelessly (for example, NR communication).
- wire for example, optical fiber, X2 interface, etc. compliant with Common Public Radio Interface (CPRI)
- NR communication for example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is an upper station, is an Integrated Access Backhaul (IAB) donor, and base station 12, which is a relay station, is an IAB donor. May also be called a node.
- IAB Integrated Access Backhaul
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication systems such as LTE, LTE-A, and 5G.
- an orthogonal frequency division multiplexing (OFDM)-based wireless access method 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
- a wireless access method may also be called a waveform.
- other wireless access methods for example, other single carrier transmission methods, other multicarrier transmission methods
- the UL and DL radio access methods may be used as the UL and DL radio access methods.
- the downlink channels include a physical downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (physical broadcast channel (PBCH)), and a downlink control channel (physical downlink control). Channel (PDCCH)) or the like may be used.
- PDSCH physical downlink shared channel
- PBCH physical broadcast channel
- PDCCH downlink control channel
- uplink channels include a physical uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH), and a random access channel. (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH physical uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, upper layer control information, etc. may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted via the PBCH.
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) that includes scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CONtrol REsource SET (CORESET)) and a search space may be used to detect the PDCCH.
- CORESET corresponds to a resource for searching DCI.
- the search space corresponds to a search area and a search method for PDCCH candidates (PDCCH candidates).
- PDCCH candidates PDCCH candidates
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.
- One 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 “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- the PUCCH allows channel state information (CSI), delivery confirmation information (for example, may be called Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and scheduling request ( Uplink Control Information (UCI) including at least one of SR)) may be transmitted.
- CSI channel state information
- delivery confirmation information for example, may be called Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- UCI Uplink Control Information including at least one of SR
- a random access preamble for establishing a connection with a cell may be transmitted by PRACH.
- downlinks, uplinks, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical” at the beginning.
- a synchronization signal (SS), a downlink reference signal (DL-RS), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DeModulation).
- Reference Signal (DMRS)), Positioning Reference Signal (PRS), 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS/PBCH block, SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.
- DMRS Downlink Reference Signal
- UL-RS uplink reference signals
- SRS Sounding Reference Signal
- DMRS demodulation reference signals
- UE-specific reference signal user terminal-specific reference signal
- FIG. 14 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- the base station 10 includes a control section 110, a transmitting/receiving section 120, a transmitting/receiving antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided.
- this example mainly shows functional blocks that are characteristic of the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit 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 will be explained based on common recognition in the technical field related to the present disclosure.
- the control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), and the like.
- the control unit 110 may control transmission and reception, measurement, etc. using the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.
- the control unit 110 may generate data, control information, a sequence, etc. to be transmitted as a signal, and may transfer the generated data to the transmitting/receiving unit 120.
- the control unit 110 may perform communication channel call processing (setting, release, etc.), status management of the base station 10, radio resource management, and the like.
- the transmitting/receiving section 120 may include a baseband section 121, a radio frequency (RF) section 122, and a measuring section 123.
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212.
- the transmitter/receiver unit 120 includes a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter/receiver circuit, etc., which are explained based on common understanding in the technical field related to the present disclosure. be able to.
- the transmitting/receiving section 120 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.
- the transmitting section may include a transmitting processing section 1211 and an RF section 122.
- the reception section may include a reception processing section 1212, an RF section 122, and a measurement section 123.
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitter/receiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transmitter/receiver 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of a transmitting beam and a receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transmitting/receiving unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmitting/receiving unit 120 performs channel encoding (which may include error correction encoding), modulation, mapping, filter processing, and discrete Fourier transform (DFT) on the bit string to be transmitted.
- a baseband signal may be output by performing transmission processing such as processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion.
- IFFT Inverse Fast Fourier Transform
- the transmitting/receiving unit 120 may perform modulation, filter processing, amplification, etc. on the baseband signal in a radio frequency band, and may transmit the signal in the radio frequency band via the transmitting/receiving antenna 130. .
- the transmitting/receiving section 120 may perform amplification, filter processing, demodulation into a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmitting/receiving unit 120 (reception processing unit 1212) performs analog-to-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) processing (if necessary), applying reception processing such as filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing, User data etc. may also be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmitting/receiving unit 120 may perform measurements regarding the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR) )) , signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), etc. may be measured.
- the measurement results may be output to the control unit 110.
- the transmission path interface 140 transmits and receives signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and transmits and receives user data (user plane data) for the user terminal 20, control plane It is also possible to acquire and transmit data.
- the transmitting unit and receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.
- the transmitting/receiving unit 120 may transmit information regarding timing advance groups corresponding to multiple transmitting/receiving points of a specific cell (for example, SpCell). If timing advance groups corresponding to a plurality of transmission and reception points can be set separately, the control unit 110 may control reception based on the timing advance for each transmission and reception point. Further, the control unit 110 may determine the timing advance group to be the primary timing advance group based on at least one of the cell type and the transmission/reception point index belonging to each timing advance.
- a specific cell for example, SpCell
- the transmitting/receiving unit 120 may transmit information regarding timing advance groups corresponding to multiple transmitting/receiving points of a specific cell (for example, SpCell).
- a specific cell for example, SpCell
- the control unit 110 instructs a timing advance command corresponding to only one transmission/reception point or a timing advance command corresponding to a plurality of transmission points, and The timing advance may be controlled respectively.
- FIG. 15 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- the user terminal 20 includes a control section 210, a transmitting/receiving section 220, and a transmitting/receiving antenna 230. Note that one or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.
- this example mainly shows functional blocks that are characteristic of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit 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 will be explained based on common recognition in the technical field related to the present disclosure.
- the control unit 210 may control signal generation, mapping, etc.
- the control unit 210 may control transmission and reception using the transmitting/receiving unit 220 and the transmitting/receiving antenna 230, measurement, and the like.
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as a signal, and may transfer the generated data to the transmitting/receiving unit 220.
- the transmitting/receiving section 220 may include a baseband section 221, an RF section 222, and a measuring section 223.
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212.
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field related to the present disclosure.
- the transmitting/receiving section 220 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.
- the transmitting section may include a transmitting processing section 2211 and an RF section 222.
- the reception section may include a reception processing section 2212, an RF section 222, and a measurement section 223.
- the transmitting/receiving antenna 230 can be configured from an antenna, such as an array antenna, as described based on common recognition in the technical field related to the present disclosure.
- the transmitter/receiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transmitter/receiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 220 may form at least one of a transmitting beam and a receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (e.g. RLC retransmission control), MAC layer processing (e.g. , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing e.g. RLC retransmission control
- MAC layer processing e.g. , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel encoding (which may include error correction encoding), modulation, mapping, filter processing, DFT processing (as necessary), and IFFT processing on the bit string to be transmitted. , precoding, digital-to-analog conversion, etc., and output a baseband signal.
- DFT processing may be based on the settings of transform precoding.
- the transmitting/receiving unit 220 transmits the above processing in order to transmit the channel using the DFT-s-OFDM waveform.
- DFT processing may be performed as the transmission processing, or if not, DFT processing may not be performed as the transmission processing.
- the transmitting/receiving unit 220 may perform modulation, filter processing, amplification, etc. on the baseband signal in a radio frequency band, and may transmit the signal in the radio frequency band via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filter processing, demodulation into a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, and decoding (error correction) on the acquired baseband signal. (which may include decoding), MAC layer processing, RLC layer processing, and PDCP layer processing may be applied to obtain user data and the like.
- the transmitting/receiving unit 220 may perform measurements regarding the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measurement unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like.
- the measurement results may be output to the control unit 210.
- the transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.
- the transmitting/receiving unit 220 may receive information regarding timing advance groups corresponding to multiple transmitting/receiving points of a specific cell. If timing advance groups corresponding to a plurality of transmission/reception points can be set separately, the control unit 210 may control timing advance for each transmission/reception point. Further, the control unit 210 may determine the timing advance group to be the primary timing advance group based on at least one of the cell type and transmission/reception point index belonging to each timing advance.
- the control unit 210 may determine that the timing advance group that includes the transmission/reception point of a specific cell is the primary timing advance group. Alternatively, the control unit 210 may determine that a timing advance group that includes a transmission/reception point having a specific index of a specific cell is a primary timing advance group. Furthermore, the control unit 210 controls to change the operation of the timing advance timer after expiration based on the number of timing advance timers that expire at the same time among the plurality of timing advance timers corresponding to the plurality of transmission/reception points, respectively. It's okay.
- the transmitting/receiving unit 220 may receive information regarding timing advance groups corresponding to multiple transmitting/receiving points of a specific cell.
- the control unit 210 controls the transmission/reception points of the multiple transmission/reception points based on a timing advance command corresponding to only one transmission/reception point or a timing advance command corresponding to multiple transmission points.
- the timing advances may be controlled individually.
- the control unit 210 may share and apply one time alignment timer to multiple TRPs.
- the control unit 210 determines the timing based on the number of timing advance timers that expire simultaneously among the plurality of timing advance timers corresponding to the plurality of transmission/reception points. Control may be provided to change the operation after the advance timer expires.
- one or more sub-timing advance groups are set within the timing advance command, and the transmission/reception points included in the same sub-timing advance group have the same timing advance command and the same timing.
- Advanced timers may also be applied.
- each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices.
- the functional block may be realized by combining software with the one device or the plurality of devices.
- functions include judgment, decision, judgement, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and consideration. , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (configuration unit) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 16 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- the base station 10 and user terminal 20 described above 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 hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.
- processor 1001 may be implemented using one or more chips.
- Each function in the base station 10 and the user terminal 20 is performed by, for example, loading predetermined software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations and communicates via the communication device 1004. This is achieved by controlling at least one of reading and writing data in the memory 1002 and storage 1003.
- predetermined software program
- the processor 1001 operates an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) that includes interfaces with peripheral devices, a control device, an arithmetic unit, registers, and the like.
- CPU central processing unit
- the above-mentioned control unit 110 (210), transmitting/receiving unit 120 (220), etc. may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with these.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and other functional blocks may also be realized in the same way.
- the memory 1002 is a computer-readable recording medium, and includes at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. It may be composed of one. Memory 1002 may be called a register, cache, main memory, or the like.
- the memory 1002 can store executable programs (program codes), software modules, and the like to implement a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM), etc.), a digital versatile disk, removable disk, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. It may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM), etc.), a digital versatile disk, removable disk, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. It may be configured by Storage 1003 may also be called an auxiliary storage device.
- the communication device 1004 is hardware (transmission/reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc., for example.
- the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be configured to include.
- FDD frequency division duplex
- TDD time division duplex
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the 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 for each device.
- the base station 10 and user terminal 20 also include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured to include hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- channel, symbol and signal may be interchanged.
- the signal may be a message.
- the reference signal may also be abbreviated as RS, and may be called a pilot, pilot signal, etc. depending on the applicable standard.
- a component carrier CC may 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 (eg, 1 ms) that does not depend on numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, and 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 be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Furthermore, a slot may be a time unit based on numerology.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may include multiple mini-slots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot.
- PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (PUSCH) mapping type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI.
- at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be.
- the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.
- TTI refers to, for example, the minimum time unit for scheduling in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- the TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.
- one slot or one minislot is called a TTI
- one or more TTIs may be the minimum time unit for scheduling.
- the number of slots (minislot number) that constitutes the minimum time unit of the 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.
- TTI TTI in 3GPP Rel. 8-12
- normal TTI long TTI
- normal subframe normal subframe
- long subframe slot
- TTI that is shorter than the normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.
- long TTI for example, normal TTI, subframe, etc.
- short TTI for example, short TTI, etc. It may also be read as a TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more continuous subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in an RB may be the same regardless of the numerology, and may be 12, for example.
- 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 have a length of one slot, one minislot, one subframe, or one TTI.
- One TTI, one subframe, etc. may each be composed of one or more resource blocks.
- one or more RBs include a physical resource block (Physical RB (PRB)), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, and an RB. They may also be called pairs.
- PRB Physical RB
- SCG sub-carrier group
- REG resource element group
- PRB pair an RB. They may also be called pairs.
- a resource block may be configured by one or more resource elements (REs).
- REs resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- Bandwidth Part (also called partial bandwidth, etc.) refers to a subset of consecutive common resource blocks (RB) for a certain numerology in a certain carrier.
- the common RB may be specified by an RB index based on a common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be configured within one carrier for a UE.
- 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 of the active BWP.
- “cell”, “carrier”, etc. in the present disclosure may be replaced with "BWP”.
- the structures of the radio frame, subframe, slot, minislot, symbol, etc. described above 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 symbols included in an RB The number of subcarriers, the number of symbols within a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
- radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of
- information, signals, etc. may be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layer.
- Information, signals, etc. may be input and output via multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Information, signals, etc. that are input and output can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.
- 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 physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper 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 thereof It may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper 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 thereof It may be carried out by
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc.
- RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of prescribed information is not limited to explicit notification, but may be made implicitly (for example, by not notifying the prescribed information or by providing other information) (by notification).
- the determination may be made by a value expressed by 1 bit (0 or 1), or by a boolean value expressed by true or false. , may be performed by numerical comparison (for example, comparison with a predetermined value).
- Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.
- software, instructions, information, etc. may be sent and received via a transmission medium.
- a transmission medium such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wired technology such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wireless technology such as infrared, microwave, etc.
- Network may refer to devices (eg, base stations) included in the network.
- precoding "precoding weight”
- QCL quadsi-co-location
- TCI state "Transmission Configuration Indication state
- space space
- spatial relation "spatial domain filter”
- transmission power "phase rotation”
- antenna port "antenna port group”
- layer "number of layers”
- Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, and “panel” are interchangeable.
- Base Station BS
- Wireless base station Wireless base station
- Fixed station NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- cell “sector,” “cell group,” “carrier,” “component carrier,” and the like
- a base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.
- a base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is connected to a base station subsystem (e.g., an indoor small base station (Remote Radio Communication services can also be provided by the Head (RRH)).
- a base station subsystem e.g., an indoor small base station (Remote Radio Communication services can also be provided by the Head (RRH)
- RRH Remote Radio Communication services
- the term “cell” or “sector” refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.
- MS Mobile Station
- UE User Equipment
- a mobile station is 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 a base station and a mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc.
- a transmitting device may be called a transmitting device, a receiving device, a wireless communication device, etc.
- the base station and the mobile station may be a device mounted on a moving object, the moving object itself, or the like.
- the moving body refers to a movable object, and the moving speed is arbitrary, and naturally includes cases where the moving body is stopped.
- the mobile objects include, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, and ships (ships and other watercraft). , including, but not limited to, airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and items mounted thereon.
- the mobile object may be a mobile object that autonomously travels based on a travel command.
- the moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ).
- a vehicle for example, a car, an airplane, etc.
- an unmanned moving object for example, a drone, a self-driving car, etc.
- a robot manned or unmanned.
- at least one of the base station and the mobile station includes 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. 17 is a diagram illustrating 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 (current sensor 50, (including 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 section 59, and a communication module 60. Be prepared.
- the drive unit 41 is composed of, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor.
- the steering unit 42 includes at least a steering wheel (also referred to as a steering wheel), 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 includes a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input/output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49.
- the electronic control section 49 may be called an electronic control unit (ECU).
- the signals from the various sensors 50 to 58 include a current signal from the current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheel 46/rear wheel 47 obtained by the rotation speed sensor 51, and a signal obtained by the air pressure sensor 52.
- air pressure signals of the front wheels 46/rear wheels 47 a vehicle speed signal acquired by the vehicle speed sensor 53, an acceleration signal acquired by the acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by the accelerator pedal sensor 55, and a brake pedal sensor.
- 56 a shift lever 45 operation signal obtained by the shift lever sensor 57, and an object detection sensor 58 for detecting obstacles, vehicles, pedestrians, etc. There are signals etc.
- the information service department 59 includes various devices such as car navigation systems, audio systems, speakers, displays, televisions, and radios that provide (output) various information such as driving information, traffic information, and entertainment information, and these devices. It consists of one or more ECUs that control the The information service unit 59 provides various information/services (for example, multimedia information/multimedia services) to the occupants of the vehicle 40 using information acquired from an external device via the communication module 60 or the like.
- various information/services for example, multimedia information/multimedia services
- the information service unit 59 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, and an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).
- an input device for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.
- an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).
- the driving support system unit 64 includes millimeter wave radar, Light Detection and Ranging (LiDAR), a camera, a positioning locator (for example, Global Navigation Satellite System (GNSS), etc.), and map information (for example, High Definition (HD)). maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., inertial measurement units (IMUs), inertial navigation systems (INS), etc.), artificial intelligence ( Artificial Intelligence (AI) chips, AI processors, and other devices that provide functions to prevent accidents and reduce the driver's driving burden, as well as one or more devices that control these devices. It consists of an ECU. Further, the driving support system section 64 transmits and receives various information via the communication module 60, and realizes a driving support function or an automatic driving function.
- LiDAR Light Detection and Ranging
- GNSS Global Navigation Satellite System
- HD High Definition
- maps for example, autonomous vehicle (AV) maps, etc.
- gyro systems e.g.,
- 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 communicates via the communication port 63 with 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, which are included in the vehicle 40.
- Data (information) is transmitted and received between the axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58.
- 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 external devices. For example, various information is transmitted and received with an 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 base station 10, user terminal 20, etc. described above.
- the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (it may function as at least one of the base station 10 and the user terminal 20).
- the communication module 60 receives signals from the various sensors 50 to 58 described above that are input to the electronic control unit 49, information obtained based on the signals, and input from the outside (user) obtained via the information service unit 59. At least one of the information based on the information may be transmitted to an external device via wireless communication.
- the electronic control unit 49, various sensors 50-58, information service unit 59, etc. may be called an input unit that receives 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, inter-vehicle information, etc.) transmitted from an external device, and displays it on the information service section 59 provided in the vehicle.
- the information service unit 59 is an output unit that outputs information (for example, outputs information to devices such as a display and a speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 60). may be called.
- the communication module 60 also stores various information received from external devices into a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 controls the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, and left and right rear wheels provided in the vehicle 40. 47, axle 48, various sensors 50-58, etc. may be controlled.
- the base station in the present disclosure may be replaced by a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- each aspect/embodiment of the present disclosure may be applied.
- the user terminal 20 may have the functions that the base station 10 described above has.
- words such as "uplink” and “downlink” may be replaced with words corresponding to inter-terminal communication (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be replaced with sidelink channels.
- the user terminal in the present disclosure may be replaced with a base station.
- the base station 10 may have the functions that the user terminal 20 described above has.
- the operations performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (e.g. It is clear that this can be performed by a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc. (though not limited thereto), or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- Each aspect/embodiment described in this disclosure may be used alone, in combination, or may be switched and used in accordance with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps 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
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG x is an integer or decimal number, for example
- Future Radio Access FAA
- RAT New-Radio Access Technology
- NR New Radio
- NX New Radio Access
- FX Future Generation Radio Access
- G Global System for Mobile Communications
- CDMA2000 Ultra Mobile Broadband
- UMB Ultra Mobile Broadband
- IEEE 802 .11 Wi-Fi (registered trademark)
- IEEE 802.16 WiMAX (registered trademark)
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth (registered trademark), and other appropriate wireless communication methods.
- the present invention may be applied to systems to be used, next-generation systems expanded, modified, created, or defined based on these
- the phrase “based on” does not mean “based solely on” unless explicitly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using the designations "first,” “second,” etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, 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 any way.
- determining may encompass a wide variety of actions. For example, “judgment” can mean judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry ( For example, searching in a table, database, or other data structure), ascertaining, etc. may be considered to be “determining.”
- judgment (decision) includes receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), access ( may be considered to be “determining”, such as accessing data in memory (eg, accessing data in memory).
- judgment is considered to mean “judging” resolving, selecting, choosing, establishing, comparing, etc. Good too.
- judgment (decision) may be considered to be “judgment (decision)” of some action.
- connection refers to any connection or coupling, direct or indirect, between two or more elements.
- the coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connection” may be replaced with "access.”
- microwave when two elements are connected, they may be connected using one or more electrical wires, cables, printed electrical connections, etc., as well as in the radio frequency domain, microwave can be considered to be “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the light (both visible and invisible) range.
- a and B are different may mean “A and B are different from each other.” Note that the term may also mean that "A and B are each different from C”. Terms such as “separate” and “coupled” may also be interpreted similarly to “different.”
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Abstract
Description
NRでは、送信設定指示状態(Transmission Configuration Indication state(TCI状態))に基づいて、信号及びチャネルの少なくとも一方(信号/チャネルと表現する)のUEにおける受信処理(例えば、受信、デマッピング、復調、復号の少なくとも1つ)、送信処理(例えば、送信、マッピング、プリコーディング、変調、符号化の少なくとも1つ)を制御することが検討されている。
・QCLタイプA(QCL-A):ドップラーシフト、ドップラースプレッド、平均遅延及び遅延スプレッド、
・QCLタイプB(QCL-B):ドップラーシフト及びドップラースプレッド、
・QCLタイプC(QCL-C):ドップラーシフト及び平均遅延、
・QCLタイプD(QCL-D):空間受信パラメータ。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP)が、1つ又は複数のパネル(マルチパネル)を用いて、UEに対してDL送信を行うことが検討されている。また、UEが、1つ又は複数のTRPに対してUL送信を行うことが検討されている。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP(Multi-TRP(MTRP)))が、UEに対してDL送信を行うことが検討されている。また、UEが、1つ又は複数のTRPに対してUL送信を行うことが検討されている。
複数のTRPを利用する場合にはUEと各TRP間との距離がそれぞれ異なるケースも生じる。複数のTRPは、同じセル(例えば、サービングセル)に含まれてもよい。あるいは、複数のTRPのうち、あるTRPがサービングセルに相当し、他のTRPが非サービングセルに相当してもよい。この場合、各TRPとUE間の距離が異なることも想定される。
タイムアライメントタイマがPTAGと関連づけられている場合、
・全てのサービングセルの全てのHARQバッファをフラッシュする。
・もし設定されている場合、全てのサービングセルに対してPUCCHをリリースするようにRRCに通知する。
・もし設定されている場合、SRSをリリースするようにRRCに通知する。
・設定されたDL割当てと設定されたUL割当てを全てクリアする。
・セミパーシステントCSI報告用のPUSCHリソースをクリアする。
・ランニング中のタイムアライメントタイマを全て満了させる。
・全てのTAGのNTAを維持する。
タイムアライメントタイマがSTAGと関連づけられている場合、当該TAGに属する全てのサービングセルに対して、
・全てのHARQバッファをフラッシュする。
・もし設定されている場合、PUCCHをリリースするようにRRCに通知する。
・もし設定されている場合、SRSをリリースするようにRRCに通知する。
・設定されたDLの割当てとULの割当てを全てクリアする。
・セミパーシステントCSI報告用のPUSCHリソースをクリアする。
・当該TAGのNTAを維持する。
上述したように、複数の送受信ポイント(例えば、TRP)/パネルを利用して通信を行う場合、TRP毎/パネル毎にタイミングアドバンスを制御することも想定される。
TRP毎に異なるTAG-IDを設定し、TRP毎に異なるTAコマンド用MAC CEを設定してもよい。各TAGは、ULタイムアライメント用にタイムアライメントタイマーを維持してもよい。
異なるTRPがTAGを共有してもよい。TAコマンド用MAC CEは1つのTRPにのみ適用されてもよい。UEは、他のTRPに対して異なるTAを適用する。例えば、UEは、TRP#0用のTA(TA_TRP#0)に基づいて、TAオフセット(TA_TRP_offset)により他のTRP(例えば、TRP#1)用のTA値を調整してもよい。
TAGを1つにしてもよい。TAコマンド用MAC CEは、UEに対する複数のサービングTRPに適用されてもよい。
TAGを1つにしてもよい。TRP/CW/PDSCH/DMRSポートグループで受信したTAコマンド用MAC CEは、TAGの同じTRP/CW/PDSCH/DMRSポートグループに適用されてもよい。TAGの各TRP/CW/PDSCH/DMRSポートグループは、ULタイムアライメント用のタイムアライメントタイマーを維持する。
サービングセルの複数(例えば、2つ)のTRPが異なるTAGに属する場合を想定する。Rel.17では、MACエンティティのSpCellを含むTAGはPTAGに相当し、それ以外のTAGはSTAGに相当する。また、PTAGとSTAGでタイムアライメントタイマーが満了(expire)した場合の動作が異なって定義される。
サービングセルの複数(例えば、2つ)のTRPが同じTAGに属し、タイミングアドバンスコマンド用MAC CE(TAC MAC CE)が1つのTRPのみに適用/指示される場合を想定する。例えば、UEは、TAC MAC CEを1つのTRPのみに適用して当該TRPのタイミングアドバンス(例えば、TA_0)を調整し、他のTRPついては、TA_0に基づくオフセットを利用してタイミングアドバンス(例えば、TA_1)を調整/制御してもよい。TA_1は、例えば、TA_0+オフセットで得られてもよい。オフセットは、RRC/MAC CE/DCIを利用して基地局からUEに指示されてもよい。
サービングセルの複数(例えば、2つ)のTRPが同じTAGに属し、タイミングアドバンスコマンド用MAC CE(TAC MAC CE)によりTRP毎にTACが指示される場合を想定する。この場合、各TRPは、それぞれタイムアライメントタイマーを維持する。
サービングセルの複数(例えば、2つ)のTRPが同じTAGに属し、タイミングアドバンスコマンド用MAC CE(TAC MAC CE)によりTRP毎にTACが指示される場合を想定する。この場合、各TRPは、それぞれタイムアライメントタイマーを維持する。
サービングセルに対応するTRPに関する情報、及び各TRPに対応するTAGに関する情報の少なくとも一つが基地局からUEに設定/通知されてもよい。
第1の実施形態では、サービングセルの複数(例えば、2つ)のTRPが異なるTAGに属する場合のタイミングアドバンスの制御について説明する。なお、第1の実施形態は、上記分析1で示した構成に対して好適に適用されてもよい。もちろん、第1の実施形態が適用されるケースはこれに限られない。
特定のセルのTRPを含むTAGがPTAGと定義/設定されてもよい。
特定のセルの特定のTRPを含むTAGがPTAGと定義/設定されてもよい。また、特定のセルの特定のTRP以外のTRPを含むTAGがSTAGと定義/設定されてもよい。
SpCellのどのTRPを含むTAGがPTAGとして参照されるかが設定されてもよい。例えば、PTAGに対応するTRPに関する情報がRRC/MAC CE等を利用して基地局からUEに設定/通知されてもよい。
あるいは、どのTAGをPTAGと参照するかが基地局からUEに設定されてもよい。例えば、PTAGに対応するTAGに関する情報がRRC/MAC CE等を利用して基地局からUEに設定/通知されてもよい。
SpCellに対応する複数のTRPが異なるTAGに属する場合、各TAGに対応するタイムアライメントタイマー満了後の動作として新規の動作が定義/適用されてもよい。
SpCellの2つのTRPをそれぞれ含む2つのTAGについて2つのタイムアライメントタイマーがそれぞれ設定/適用される場合を想定する(図8参照)。図8では、SpCellのTRP#0とSCell#1を含むTAG#0と、SpCellのTRP#1とSCell#2を含むTAG#1と、にそれぞれタイムアライメントタイマーが別々に設定される場合を示している。
SCellに対して、当該SCellの2つのTRPをそれぞれ含む2つのTAGについて2つのタイムアライメントタイマーがそれぞれ設定/適用される場合を想定する(図9参照)。図9では、SCell#1のTRP#0とSpCellを含むTAG#0と、SCell#1のTRP#1とSCell#2を含むTAG#1と、にそれぞれタイムアライメントタイマーが別々に設定される場合を示している。
L1/L2セル間オペレーション(例えば、L1/L2 inter-cell operation)において、第1の実施形態が適用されてもよい。
MACエンティティのSpCellのPCIを含むTAGがPTAGと定義/設定されてもよい。UEは、当該TAGのタイムアライメントタイマーが満了した場合、所定のPTAG用の動作を適用してもよい。これは、セルグループ(例えば、MCG/SCG)に複数のPTAGが存在することを意味してもよい。
MACエンティティのSpCellのPCIを含むTAGがPTAGと定義/設定されてもよい。UEは、当該TAGのタイムアライメントタイマーが満了した場合、所定のPTAG用の動作を適用してもよい。
SpCellのどのPCIを含むTAGがPTAGとして参照されるかが設定されてもよい。
タイムアライメントタイマーに関連するTAG(例えば、PTAG/STAG)に関する動作として新規の動作が定義/適用されてもよい。
SpCellに対して、当該SpCellの複数のPCIをそれぞれ含む複数のTAGについて複数のタイムアライメントタイマーがそれぞれ設定/適用される場合を想定する。
第2の実施形態では、サービングセルの複数(例えば、2つ)のTRPが同じTAGに属する場合のタイミングアドバンスの制御について説明する。なお、第2の実施形態は、上記分析2で示した構成に対して好適に適用されてもよい。もちろん、第2の実施形態が適用されるケースはこれに限られない。
2つのTRPは、1つのタイムアライメントタイマーを共有してもよい(図10A参照)。UEは、オフセットの指示(又は、オフセットに関する情報)を受信した場合、タイムアライメントタイマーに影響を与えなくてもよい(Alt.2-1―1)。例えば、UEは、タイムアライメントタイマーがランニング中にオフセットに関する情報を受信しても、当該タイムアライメントタイマーを継続して適用し(再セットせず)、オフセットの内容を反映しなくてもよい。この場合、タイムアライメントタイマーが満了し、その後に適用するタイムアライメントタイマーにオフセットが反映されてもよい。
TAコマンド用MAC CEによりTAが調整されるTPR(例えば、TRP#0)に対して、第1のタイムアライメントタイマーが適用/維持されてもよい。第1のタイムアライメントタイマーは、例えば、既存システム(例えば、Rel.17/Rel.16)でサポートされるタイムアライメントタイマーであってもよい。
L1/L2セル間オペレーション(例えば、L1/L2 inter-cell operation)において、第2の実施形態が適用されてもよい。
第3の実施形態では、サービングセルの複数(例えば、2つ)のTRPが同じTAGに属し、TAコマンド用MAC CEがTRP毎にTAC(又は、TRP毎のTAC)を指示する場合のタイミングアドバンスの制御について説明する。なお、第3の実施形態は、上記分析3で示した構成に対して好適に適用されてもよい。もちろん、第3の実施形態が適用されるケースはこれに限られない。
UEは、タイムアライメントタイマーが満了したTRPが含まれるTAG(例えば、TAG#0)に対して、所定のTAG用の動作(例えば、所定のPTAG用の動作)を適用するように制御してもよい。
UEは、タイムアライメントタイマーが満了したTRPが含まれるTAG(例えば、TAG#0)に対して、所定のTAG用の動作(例えば、所定のPTAG用の動作)を適用しないように制御してもよい。言い換えると、TAGに含まれる少なくとも一つのTRPがランニング中である場合、所定のPTAG用動作を行わなくてもよい。
複数のケースに応じて異なるオプションが適用されてもよい。
L1/L2セル間オペレーション(例えば、L1/L2 inter-cell operation)において、第3の実施形態が適用されてもよい。
第4の実施形態では、サービングセルの複数(例えば、2つ)のTRPが同じTAGに属し、TAコマンド用MAC CEがTRP毎にTACを指示する場合のタイミングアドバンスの制御について説明する。なお、第4の実施形態は、上記分析4で示した構成に対して好適に適用されてもよい。もちろん、第4の実施形態が適用されるケースはこれに限られない。
どのTRPが同じTAコマンド/同じタイムアライメントタイマーを共有するかについて、RRC/MAC CEを利用して基地局からUEに設定されてもよい。また、どのTRPがどのサブTAGに属するかについて、RRC/MAC CEを利用して基地局からUEに設定されてもよい。
L1/L2セル間オペレーション(例えば、L1/L2 inter-cell operation)において、第3の実施形態が適用されてもよい。
上記第1の実施形態~第4の実施形態において、以下のUE能力(UE capability)が設定されてもよい。なお、以下のUE能力は、ネットワーク(例えば、基地局)からUEに設定するパラメータ(例えば、上位レイヤパラメータ)と読み替えられてもよい。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図14は、一実施形態に係る基地局の構成の一例を示す図である。基地局10は、制御部110、送受信部120、送受信アンテナ130及び伝送路インターフェース(transmission line interface)140を備えている。なお、制御部110、送受信部120及び送受信アンテナ130及び伝送路インターフェース140は、それぞれ1つ以上が備えられてもよい。
図15は、一実施形態に係るユーザ端末の構成の一例を示す図である。ユーザ端末20は、制御部210、送受信部220及び送受信アンテナ230を備えている。なお、制御部210、送受信部220及び送受信アンテナ230は、それぞれ1つ以上が備えられてもよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
なお、本開示において説明した用語及び本開示の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル、シンボル及び信号(シグナル又はシグナリング)は、互いに読み替えられてもよい。また、信号はメッセージであってもよい。参照信号(reference signal)は、RSと略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(Component Carrier(CC))は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- 特定のセルの複数の送受信ポイントに対応するタイミングアドバンスグループに関する情報を受信する受信部と、
前記複数の送受信ポイントが同じタイミングアドバンスグループに属する場合、1つのみの送受信ポイントに対応するタイミングアドバンスコマンド又は複数の送信ポイントに対応するタイミングアドバンスコマンドに基づいて、前記複数の送受信ポイントのタイミングアドバンスをそれぞれ制御する制御部と、を有する端末。 - 前記制御部は、前記複数のTRPに対して1つのタイムアライメントタイマーを共有して適用する請求項1に記載の端末。
- 前記複数の送受信ポイント毎にタイミングアドバンスコマンドがそれぞれ指示される場合、前記制御部は、前記複数の送受信ポイントにそれぞれ対応する複数のタイミングアドバンスタイマーのうち、同時に満了するタイミングアドバンスタイマーの数に基づいて、前記タイミングアドバンスタイマーの満了後の動作を変更する請求項1又は請求項2のいずれかに記載の端末。
- 前記複数の送受信ポイント毎にタイミングアドバンスコマンドがそれぞれ指示される場合、前記タイミングアドバンスコマンド内に1以上のサブタイミングアドバンスグループが設定され、同じサブタイミングアドバンスグループに含まれる送受信ポイントは同じタイミングアドバンスコマンド及び同じタイミングアライメントタイマが適用される請求項1から請求項3のいずれかに記載の端末。
- 特定のセルの複数の送受信ポイントに対応するタイミングアドバンスグループに関する情報を受信する工程と、
前記複数の送受信ポイントが同じタイミングアドバンスグループに属する場合、1つのみの送受信ポイントに対応するタイミングアドバンスコマンド又は複数の送信ポイントに対応するタイミングアドバンスコマンドに基づいて、前記複数の送受信ポイントに対するタイミングアドバンスをそれぞれ制御する工程と、を有する端末の無線通信方法。 - 特定のセルの複数の送受信ポイントに対応するタイミングアドバンスグループに関する情報を送信する送信部と、
前記複数の送受信ポイントが同じタイミングアドバンスグループに属する場合、1つのみの送受信ポイントに対応するタイミングアドバンスコマンド又は複数の送信ポイントに対応するタイミングアドバンスコマンドを指示し、前記複数の送受信ポイントのタイミングアドバンスをそれぞれ制御する制御部と、を有する基地局。
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