WO2024171390A1 - 端末、無線通信方法及び基地局 - Google Patents
端末、無線通信方法及び基地局 Download PDFInfo
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- WO2024171390A1 WO2024171390A1 PCT/JP2023/005539 JP2023005539W WO2024171390A1 WO 2024171390 A1 WO2024171390 A1 WO 2024171390A1 JP 2023005539 W JP2023005539 W JP 2023005539W WO 2024171390 A1 WO2024171390 A1 WO 2024171390A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
Definitions
- This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- Non-Patent Document 1 LTE-Advanced (3GPP Rel. 10-14) was specified for the purpose of achieving higher capacity and greater sophistication over LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).
- LTE 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- This disclosure has been made in consideration of these points, and one of its objectives is to provide a terminal, a wireless communication method, and a base station that are capable of appropriately controlling UL transmission even when UL transmission is possible to multiple candidate cells.
- a terminal is characterized in that it has a receiving unit that receives an indication of one candidate cell index or timing advance group (TAG) ID for physical random access channel (PRACH) transmission via a physical link downlink control channel (PDCCH) and receives a trigger of a method that does not use a random access procedure for one or more other candidate cells or TAGs, and a control unit that controls PRACH transmission to a candidate cell corresponding to the candidate cell index or TAG ID based on the indication.
- TAG timing advance group
- PRACH physical random access channel
- PDCCH physical link downlink control channel
- UL transmission can be appropriately controlled even when UL transmission is possible for multiple candidate cells.
- FIG. 1A is a diagram showing an example of UE movement in Rel. 17.
- Figure 1B is a diagram showing an example of UE movement in Rel. 18.
- FIG. 2 is a diagram showing an example of association between a serving cell and a candidate cell.
- 3A and 3B are diagrams showing a second and a third example of the candidate cell configuration option 2.
- FIG. 4 is a diagram showing a serving cell switch example 1.
- FIG. 5 is a diagram showing a serving cell switch example 2.
- FIG. 6 is a diagram showing a serving cell switch example 3.
- FIG. 7 is a diagram showing an example of a timing advance group (TAG) to which cells included in a cell group belong.
- Figure 8 shows an example of a MAC CE for a timing advance command.
- TAG timing advance group
- FIG. 9 shows an example of TAG configuration when TAG ID association with a candidate cell is supported.
- Figure 10 shows an overview of L1L2-triggered mobility (LTM).
- FIG. 11 illustrates a PDCCH ordered RACH with random access response (RAR) monitoring for a serving cell.
- FIG. 12 illustrates a PDCCH ordered RACH without random access response (RAR) monitoring for a candidate cell.
- FIG. 13 is a diagram showing DCI format 1_0 that is CRC scrambled by the C-RNTI.
- 14A and 14B are diagrams showing examples of DCI fields used to notify cell identification information.
- FIG. 15 is a diagram illustrating an example of cell configuration according to the first embodiment.
- FIG. 23 is a diagram showing an example of the process of aspect 1-3.
- FIG. 24 is a diagram showing the relationship between the number of PRACH transmissions set by the RRC and the number of DCI bits.
- 25A to 25C are diagrams showing examples of allocation of the number of PRACH transmissions to DCI fields.
- 26A to 26C are diagrams showing an example in which the number of PRACH transmissions is assigned to DCI fields in ascending/descending order.
- FIG. 27 is a diagram showing an example of a DCI field when the number of PRACH transmissions is set/indicated by higher layer signaling.
- FIG. 28 is a diagram showing the procedure of the RACH-less method.
- FIG. 29 is a diagram showing an overview of the RACH-less method.
- FIG. 30 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 31 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- FIG. 32 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- FIG. 33 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- FIG. 34 is a diagram illustrating an example of a vehicle according to an embodiment.
- TCI transmission configuration indication state
- the TCI state may represent that which applies to the downlink signal/channel.
- the equivalent of the TCI state which applies to the uplink signal/channel may be expressed as a spatial relation.
- TCI state is information about the Quasi-Co-Location (QCL) of signals/channels and may also be called spatial reception parameters, spatial relation information, etc. TCI state may be set in the UE on a per channel or per signal basis.
- QCL Quasi-Co-Location
- QCL is an index that indicates the statistical properties of a signal/channel. For example, if a signal/channel has a QCL relationship with another signal/channel, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) is identical between these different signals/channels (i.e., it is QCL with respect to at least one of these).
- spatial parameters e.g., spatial Rx parameters
- the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL.
- the QCL (or at least one element of the QCL) in this disclosure may be interpreted as sQCL (spatial QCL).
- QCL types QCL types
- QCL types A to D QCL types A to D
- the parameters (which may be called QCL parameters) are as follows: QCL Type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay; QCL Type D (QCL-D): Spatial reception parameters.
- QCL Type A QCL-A
- QCL-B Doppler shift and Doppler spread
- QCL type C QCL type C
- QCL Type D QCL Type D
- the UE's assumption that a Control Resource Set (CORESET), channel or reference signal is in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel or reference signal may be referred to as a QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- the UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI condition or QCL assumption of the signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information regarding the QCL between the target channel (in other words, the reference signal (RS) for that channel) and another signal (e.g., another RS).
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.
- target channel/RS target channel/reference signal
- reference RS reference signal
- the channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the following: a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), a QCL detection reference signal (also called a QRS), a demodulation reference signal (DMRS), etc.
- 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
- An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be referred to as an SS/PBCH block.
- An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel/signal (DMRS), and this RS may be called a QCL source of QCL type X in that TCI state.
- DMRS channel/signal
- the UE performs UL transmission to one or more cells/TRPs.
- the serving cell may be read as a TRP in the serving cell.
- Layer 1/layer 2 (L1/L2) and DCI/Medium Access Control Control Element (MAC CE) may be read as each other.
- MAC CE DCI/Medium Access Control Control Element
- a PCI different from the physical cell identity (PCI) of the current serving cell may be simply described as a "different PCI".
- a non-serving cell, a cell having a different PCI, and an additional cell may be read as each other.
- Scenario 1 corresponds to, for example, multi-TRP inter-cell mobility, but it may also be a scenario that does not correspond to multi-TRP inter-cell mobility.
- the UE receives from the serving cell the configuration necessary to use radio resources for data transmission and reception, including an SSB configuration for beam measurement of a TRP corresponding to a PCI different from that of the serving cell, and resources of the different PCI.
- the UE performs beam measurements of TRPs corresponding to different PCIs and reports the beam measurement results to the serving cell.
- the Transmission Configuration Indication (TCI) states associated with the TRPs corresponding to different PCIs are activated by L1/L2 signaling from the serving cell.
- the UE transmits and receives using UE-dedicated channels on TRPs corresponding to different PCIs.
- the UE must always cover the serving cell, including in the case of multi-TRP.
- the UE must use common channels (Broadcast Control Channel (BCCH), Paging Channel (PCH)) from the serving cell, as in the conventional system.
- BCCH Broadcast Control Channel
- PCH Paging Channel
- scenario 1 when the UE transmits and receives signals to and from an additional cell/TRP (a TRP corresponding to the PCI of the additional cell), the serving cell (the serving cell assumption in the UE) is not changed.
- the UE is configured with higher layer parameters related to the PCI of the non-serving cell from the serving cell. Scenario 1 may be applied, for example, in Rel. 17.
- Figure 1A shows an example of UE movement in Rel. 17.
- the UE moves from a cell with PCI #1 (serving cell) to a cell with PCI #3 (additional cell) (which overlaps with the serving cell).
- the serving cell cannot be switched by L1/L2.
- the additional cell is a cell with an additional PCI that is different from the PCI of the serving cell.
- the UE can receive/transmit UE-dedicated channels from the additional cell.
- the UE needs to be within the coverage of the serving cell to receive UE common channels (e.g., system information/paging/short messages).
- ⁇ Scenario 2> L1/L2 inter-cell mobility is applied.
- the serving cell can be changed using a function such as beam control without RRC reconfiguration.
- a function such as beam control without RRC reconfiguration.
- transmission and reception with an additional cell is possible without handover. Since a period in which data communication is not possible occurs due to the need for RRC reconnection for handover, data communication can be continued even when the serving cell is changed by applying L1/L2 inter-cell mobility that does not require handover.
- Scenario 2 may be applied in, for example, Rel. 18. In scenario 2, for example, the following procedure is performed.
- the UE receives SSB configuration of a cell (additional cell) with a different PCI from the serving cell for beam measurement/serving cell change.
- the UE performs beam measurements of cells using different PCIs and reports the measurement results to the serving cell.
- the UE may receive a configuration of a cell having a different PCI (serving cell configuration) by higher layer signaling (e.g., RRC). That is, a pre-configuration regarding a serving cell change may be performed. This configuration may be performed together with the configuration in (1) or separately.
- the TCI states of cells with different PCIs may be activated by L1/L2 signaling according to the change of serving cell. The activation of the TCI state and the change of serving cell may be performed separately.
- the UE changes the serving cell (assumed serving cell) and starts receiving/transmitting using a pre-configured UE-specific channel and TCI state.
- scenario 2 the serving cell (the assumed serving cell in the UE) is updated by L1/L2 signaling.
- Scenario 2 may be applied in Rel. 18.
- Figure 1B shows an example of UE movement in Rel. 18.
- the serving cell is switched by L1/L2.
- the UE can receive/transmit UE-dedicated/common channels to/from the new serving cell.
- the UE may move out of the coverage of the previous serving cell.
- FIG. 2 is a diagram showing an example of the association between a serving cell and a candidate cell.
- SpCell#0, SCell#1, or SCell#2 is assumed to be a serving cell.
- SpCell means a special cell (including a primary cell (PCell) and a primary secondary cell (PSCell)).
- SCell means a secondary cell.
- SpCell#0 is associated with candidate cell#0-1, candidate cell#0-2, and candidate cell#0-3.
- SCell#1 is associated with candidate cell#1-1.
- SCell#2 is associated with candidate cell#2-1, 2-2. In this way, one or more candidate cells (candidate serving cells) may be associated with a serving cell.
- the following options 1 and 2 can be considered for setting candidate cells (candidate cells).
- the information in ServingCellConfig may include information about multiple candidate cells, which need to share the same PDCCH/PDSCH/UL etc. configurations as the serving cell.
- mimoParam-r17 is added under ServingCellConfig, and PCI setting information is added.
- mimoParam-r17 may include additionalPCI-ToAddModList-r17, which is an information list of additional SSBs with a PCI different from the PCI of the serving cell. The same settings as the serving cell may be applied to candidate cells (additional cells, cells with additionalPCI), with the exception of some information.
- Multiple candidate cells may be associated with each serving cell by reusing the carrier aggregation (CA) configuration framework, with a complete configuration (e.g., ServingCellConfig) corresponding to each cell. That is, the candidate cells may not share configuration information with the serving cell and may have a separate configuration. The UE is provided with the complete configuration of each candidate cell, so that it can communicate properly with the candidate cells.
- CA carrier aggregation
- an SpCell can be configured for each cell group and multiple SCells can be added.
- a serving cell can be configured for each cell group for L1/L2 inter-cell mobility, and multiple candidate cells can be configured.
- the candidate cells can be activated/deactivated by the MAC CE.
- the candidate cells can be activated/deactivated by activating/deactivating the TCI information corresponding to the candidate cells by the MAC CE. This method is considered to be beneficial for reducing the complexity of UE operations.
- FIG. 3A is a diagram showing a first example of option 2 for candidate cell configuration.
- a common candidate cell pool for cell switching in the MCG/SCG is applied to the candidate cells.
- the candidate cells are treated as one pool (group) regardless of the frequency band.
- Figure 3B is a diagram showing a second example of option 2 for candidate cell configuration.
- multiple cell groups are configured, and cell group switching is possible by L1/L2 signaling.
- Candidate cells are configured for each cell group, and the configuration for each group includes the indices of the corresponding SpCell and SCell.
- Implicit or explicit signaling for serving cell change indication is described.
- a particular Control Resource Set (e.g., at least one of CORESET#0, CORESET of CH5 Type0-CSS, CORESET of CH6/CH7/CH8 CSS) is indicated (activated) by a MAC CE together with one or more TCI states associated with a cell of a PCI different from that of the serving cell (when, for a particular CORESET, one or more TCI states associated with a cell of a PCI different from that of the serving cell are indicated/activated by a MAC CE), the UE may determine to change the serving cell to another cell (cell x, a cell with a different PCI). That is, this activation may implicitly indicate changing the serving cell to another cell.
- CORESET Control Resource Set
- the UE may update beams of other CORESET IDs, other CORESETs using CH6/CH7/CH8, or other CORESETs using CSS to the same TCI state as the activated TCI state.
- the UE may determine to change the serving cell to another cell (cell x), i.e., the association may implicitly indicate the change of the serving cell to another cell.
- the NW base station
- the MAC CE activates the TCI state of a PDSCH associated with a cell with a different PCI, it must also include the TCI state related to another cell (e.g., the current serving cell or a cell with a second different PCI).
- the UE may determine to change the serving cell to another cell (cell x), i.e., the association may implicitly indicate the serving cell change to another cell.
- Option 2-1 An example of a serving cell change instruction will be described below. Note that activation/deactivation of a non-serving cell, change of a serving cell, and transmission/reception with another cell (non-serving cell) having a physical cell ID different from the physical cell ID of the serving cell may be read as interchangeable.
- the UE may receive a new MAC CE including at least one of the fields (information) indicating the following (1) to (3) corresponding to the non-serving cell, which is used for activating/deactivating the non-serving cell.
- the UE may decide to change the serving cell to another cell (non-serving cell).
- the UE may also control transmission and reception of DL signals/UL signals with the non-serving cell based on the information.
- the non-serving cell may be one or multiple. In the example shown below, a MAC CE including multiple fields indicating multiple non-serving cell indexes is applied.
- CSI resource configuration ID (CSI-ResourceConfigId) (when CSI-ResourceConfigId corresponds to one or more non-serving cells).
- CSI-ResourceConfigId (when CSI-ResourceConfigId corresponds to one or more non-serving cells).
- 3-5 A bitmap indicating the activation/deactivation of each non-serving cell.
- the size (number of bits) of the bitmap may be the same as the number of non-serving cells configured on this CC. For example, when activating the second non-serving cell among three non-serving cells, "010" is set.
- At least one of the pieces of information included in the MAC CE may be included in the DCI. Or, at least one of the serving cells activated by the MAC CE may be indicated by the DCI.
- the MAC CE/DCI may include a field indicating the TCI status/SSB/CSI-RS from a cell with a different PCI so that the UE can recognize the DL beam to be monitored on the target cell (the serving cell after the change).
- the UE may create and transmit a beam report (CSI report) using the TCI status/SSB/CSI-RS.
- the UE may receive a MAC CE in which a new 1-bit field "C" is added to the existing MAC CE.
- the field indicates whether to change the serving cell.
- the UE may receive the MAC CE and determine whether to change the serving cell to another cell based on the field.
- a field indicating the serving cell index/PCI/other ID (such as the new ID in Option 2-1 described above) and a field indicating the TCI state/SSB/CSI-RS of the target cell (the serving cell after the change) may be included in the MAC CE.
- the UE can appropriately change the serving cell.
- [Serving Cell Switch Example 1] 4 is a diagram showing a serving cell switch example 1.
- the candidate cell #0-2 becomes the new serving cell SpCell#0.
- the serving cell SCell#2 of the MCG/SCG when the serving cell is instructed to be changed to the candidate cell #2-1 by L1/L2 signaling, the candidate cell #2-1 becomes the new serving cell SCell#2.
- the RRC/MAC CE can configure a global candidate cell ID (cell #0,...,5) for each cell group, band, FR, and UE.
- the UE may be instructed to switch serving cells by the global candidate cell ID.
- Figure 5 shows a serving cell switch example 2. Similar to Figure 3A, a pool of multiple candidate cells can be configured, and the serving cell can be switched to any (activated) candidate cell in the pool by L1/L2 signaling.
- the configured candidate cell can be either an SpCell or an SCell based on L1/L2 signaling.
- the UE may receive an instruction to change the serving cell (from cell #2-1 to candidate cell #4) via MAC CE/DCI. Then, the indicated candidate cell #4 becomes the SpCell of the new cell group.
- the RRC/MAC CE can set a global candidate cell ID (cell #0-1, #0-1, ..., 2-2) for each cell group, band, FR, and UE.
- the UE may be instructed to switch the serving cell by the global candidate cell ID.
- FIG. 6 shows serving cell switch example 3.
- the UE receives an instruction to change the serving cell (from cell #2-0 to cell #2-1) via MAC CE/DCI.
- the indicated cell #2-1 then becomes the SpCell of the new cell group.
- the cells (cell #0-0, cell #1-0) in the same cell group as the indicated cell #2-1 become Scell #1 and Scell #2. In other words, the serving cell group is switched.
- the distance between the UE and each TRP may be different.
- the multiple TRPs may be included in the same cell (e.g., a serving cell).
- one TRP among the multiple TRPs may correspond to a serving cell and the other TRPs may correspond to a non-serving cell. In this case, it is also assumed that the distance between each TRP and the UE may be different.
- the transmission timing of UL (Uplink) channels and/or UL signals (UL channels/signals) is adjusted by the Timing Advance (TA).
- TA Timing Advance
- the reception timing of UL channels/signals from different user terminals is adjusted by the radio base station (TRP: Transmission and Reception Point, also known as gNB: gNodeB, etc.).
- the UE may control the timing of UL transmission by applying a timing advance (multiple timing advances) for each pre-configured timing advance group (TAG: Timing Advance Group).
- TAG Timing Advance Group
- Timing Advance Groups classified by transmission timing are supported.
- the UE may control the UL transmission timing for each TAG, assuming that the same TA offset (or TA value) is applied to each TAG.
- the TA offset may be set independently for each TAG.
- the UE can independently adjust the transmission timing of cells belonging to each TAG, allowing the radio base station to align the timing of receiving uplink signals from the UE even when multiple cells are used.
- TAGs may be configured by higher layer parameters.
- the same timing advance value may be applied to serving cells (e.g., serving cells for which UL is configured) belonging to the same TAG.
- a timing advance group including the SpCell of a MAC entity may be called a Primary Timing Advance Group (PTAG), and other TAGs may be called Secondary Timing Advance Groups (STAGs).
- PTAG Primary Timing Advance Group
- STAGs Secondary Timing Advance Groups
- FIG. 7 shows a case where three TAGs are configured for a cell group including SpCell and SCell#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 (TAG#2).
- the timing advance command may be notified to the UE using a MAC control element (e.g., MAC CE).
- the TA command is a command indicating the transmission timing value of the uplink channel 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 (e.g., TA timer) based on the reception of the TA command.
- the MAC CE for the timing advance command may include a field for a timing advance group index (e.g. TAG ID) and a field for the timing advance command (see FIG. 8).
- TAG ID field is used to indicate the TAG ID of the addressed TAG.
- the timing advance command field may indicate an index value T A (0, 1, 2...63) that is used to control the amount of timing adjustment the MAC entity must apply.
- Parameters corresponding to each TAG ID may be set by higher layer parameters. For example, parameters such as a time alignment timer (e.g., timeAlignmentTimer) corresponding to each TAG ID may be set. Alternatively, the TAG ID for each serving cell may be set by higher layer parameters (e.g., tag-ID included in ServingCellConfig). After being set by higher layer parameters, the TAG ID/parameters may be updated by the MAC CE.
- time alignment timer e.g., timeAlignmentTimer
- the TAG ID for each serving cell may be set by higher layer parameters (e.g., tag-ID included in ServingCellConfig).
- a time alignment timer may be maintained for UL time alignment.
- the time alignment timer may be configured/associated per TAG.
- the UE receives a MAC CE for a timing advance command (e.g., TAC MAC CE), it starts/restarts the time alignment timer associated with the indicated timing advance group (e.g., TAG), respectively.
- the MAC entity receives the TAC MAC CE and applies a timing advance command for the indicated TAG or starts or restarts a time alignment timer associated with the indicated TAG if a predefined value (N TA ) is maintained between the indicated TAG, which may be the timing advance between DL and UL.
- N TA a predefined value
- Rel. 17 supports the application of a specific PTAG operation when a timing advance timer corresponding to a PTAG expires, and the application of a specific STAG operation when a timing advance timer corresponding to a STAG expires.
- the following operations e.g., a specified PTAG operation/a specified STAG operation
- the following operations e.g., a specified PTAG operation/a specified STAG operation
- Predetermined PTAG Operation If a time alignment timer is associated with the PTAG, Flush all HARQ buffers of all serving cells. - If configured, inform RRC to release PUCCH for all serving cells. - If set, notify RRC to release SRS. Clear all configured DL allocations and configured UL allocations. Clear the PUSCH resources for semi-persistent CSI reporting. - Allow all time alignment timers to expire while running. - Maintain NTAs for all TAGs.
- Predetermined STAG Actions If a time alignment timer is associated with a STAG, then for all serving cells belonging to that STAG: Flush all HARQ buffers. - If configured, notify RRC to release PUCCH. - If set, notify RRC to release SRS. Clear all configured DL and UL allocations. Clear the PUSCH resources for semi-persistent CSI reporting. - Maintain the NTA of the TAG.
- UL transmission will be controlled based on timing advance for a serving cell (or a TRP of a serving cell) and a non-serving cell/additional cell (or a TRP of a non-serving cell/additional cell).
- TAGs or TAG-IDs
- different TAGs will be set for one or more TRPs (e.g., multiple TRPs having different PCIs) corresponding to a certain cell (or CC).
- TRPs corresponding to a certain cell will share a common TAG.
- FIG. 9 shows an example of TAG settings for multiple cells (or TRPs) with different PCIs.
- a maximum of M PCIs (e.g., serving cell + candidate cells associated with the serving cell) can be configured for each CC, and it is assumed that the configuration of a maximum of N TAGs (e.g., N ⁇ M) is supported for the maximum M PCIs. In this case, one or more PCIs may be associated with one TAG.
- one or more PCIs may be associated with one TAG for up to S serving cells in a cell group (or for up to S serving cells).
- up to T TAGs may be configured considering one PCI for each CC (Case 1). That is, up to T ⁇ N TAGs may be configured for up to M ⁇ S cells. Alternatively, up to U TAGs may be configured for up to M ⁇ S cells (Case 2).
- FIG. 10 is a diagram showing an overview of L1L2-triggered mobility (LTM).
- LTM and L1/L2 inter-cell mobility may be interchangeable.
- the UE receives candidate configurations for candidate cells from the NW during UE reconfiguration.
- the UE reconfiguration includes T RRC and T proccesing1/T proccesing2 .
- T RRC e.g., up to 10 ms
- T proccesing1/T proccesing2 e.g., up to 20 ms for the same FR and up to 40 ms for different FRs
- This may include L2/3 reconfiguration, RF retuning, baseband retuning, security updates if necessary, etc.
- T search (e.g. 0 ms if cell is known, max 60 ms if cell is unknown) is the time required to search for the target cell.
- T ⁇ is the time for fine tracking and acquisition of all timing information.
- T margin (e.g. max 2 ms) is the time for post processing of SSB and CSI-RS.
- the L1 measurement includes T meas (SMTC period (eg, 20 ms)), which is the measured delay from the appearance of the target to the cell switch command.
- T meas SMTC period (eg, 20 ms)
- T IU e.g., max. 15 ms
- T RAR e.g., max. 4 ms
- T cmd e.g., max. 5 ms
- L1/L2 commands HARQ and paging
- T first-data after T cmd is the time when the UE performs the first DL reception/UL transmission on the indicated beam of the target cell after the RAR.
- FIG. 11 illustrates a PDCCH ordered RACH with random access response (RAR) monitoring for a serving cell.
- RAR random access response
- the source cell and the source cell group may be interchangeable.
- the candidate cell and the candidate cell group may be interchangeable.
- the source cell sends a candidate cell setting to the UE. Then, the source cell sends a RACH instruction (PDCCH order) to the UE using a PDCCH (including, for example, DCI format 1_0). Note that in this instruction, one candidate cell is specified because parallel RAR is complicated. Then, the UE sends a PRACH in the RACH procedure to the candidate cell to acquire the TAG/TA.
- a RACH instruction PDCCH order
- PDCCH including, for example, DCI format 1_0
- the source cell then sends an RAR (TA indication) to the UE.
- RAR TA indication
- the RAR is monitored in the SpCell (only in the Distributed Unit (DU)).
- the UE may then transmit and receive in the current serving cell. TA adjustment is then performed in the source cell.
- the source cell then sends a cell switch command to the UE.
- TA information can be moved from the source cell to the target cell.
- UL synchronization of all candidate cells may not be completed.
- the UE performs the first UL transmission using the initial TA.
- Figure 12 shows a PDCCH ordered RACH without random access response (RAR) monitoring for a candidate cell. Only the differences between Figure 12 and Figure 11 will be described.
- multiple candidate cells may be indicated in the RACH indication by the PDCCH (PDCCH order).
- the UE may transmit a PRACH in the RACH procedure to the candidate cell to obtain multiple TAGs/TAs.
- the source cell then transmits a TA indication in the cell switch command without transmitting an RAR.
- Figure 13 shows DCI format 1_0 that is CRC scrambled by the C-RNTI.
- the frequency domain resource assignment may be used, for example, for RACH (PDCCH order) according to the instruction of the PDCCH.
- the random access preamble index may be used for Contention based Random Access (CBRA).
- the reserved bits are 12 bits when operating in a cell with spectrum shared channel access, and 10 bits otherwise.
- PDCCH order An example of UE operation when a network (e.g., a base station) transmits a PDCCH order requesting a PRACH transmission will be described.
- the UE may determine the cell to which the PDCCH order (or the PRACH that transmits by the PDCCH order) corresponds based on a predefined parameter used for the PDCCH of the PDCCH order.
- the predefined parameter may be, for example, the TCI state.
- the PRACH requested by the PDCCH order may correspond to the non-serving cell.
- the UE may control the PRACH transmission based on the PRACH setting of the non-serving cell.
- the UE may then determine the TA of the non-serving cell based on a DL transmission (e.g., RAR) that is fed back for the PRACH transmission.
- a DL transmission e.g., RAR
- the PRACH requested by the PDCCH order may correspond to the serving cell.
- the UE may control the PRACH transmission based on the PRACH configuration of the serving cell.
- the UE may then determine the TA of the serving cell based on the DL transmission (e.g., RAR) fed back for the PRACH transmission.
- the UE may determine the cell to which the PDCCH order (or the PRACH that transmits by the PDCCH order) corresponds based on the DCI (or CORESET) used in the PDCCH order.
- the DCI used in the PDCCH order may include identification information of the cell to which the PRACH corresponds (e.g., cell index/cell type (e.g., serving cell/non-serving cell)) and notify the UE.
- identification information of the cell to which the PRACH corresponds e.g., cell index/cell type (e.g., serving cell/non-serving cell)
- X reserved bits of the DCI may be used to notify the cell to explicitly indicate the serving cell/non-serving cell to which the PRACH corresponds.
- the reserved bits may be reserved bits included in DCI format 1_0 in the existing system (e.g., Rel. 15/16).
- the bit size of X may be set/determined/determined based on the number of non-serving cells configured. For example, if one non-serving cell is configured, X may be 1 bit (see FIG. 14A). In this case, '0' may indicate a serving cell and '1' may indicate a non-serving cell.
- the field used to notify the cell identification information may be the most significant bit (MSB) or the least significant bit (LSB) of the reserved bits.
- X may be two bits (see FIG. 14B).
- Re-indexed non-serving cell indices may be applied to indicate the non-serving cells.
- the association between cell indices and bit values (or code points) may be defined in the specification or may be set by higher layer signaling, etc.
- code points '0' or '00' may indicate the serving cell, and the remaining bits may be associated with the index order (e.g., ascending/descending) of the configured non-serving cells.
- the size of X may be fixed and the number of bits may not change regardless of the number of non-serving cells configured.
- the unused bits/fields may be configured as reserved bits.
- the random access preamble index (eg, ra-PreambleIndex) is a predefined value (eg, 0-63)
- a portion of the preamble may be configured/activated by the RRC/MAC CE to be associated with a non-serving cell.
- the serving cell/non-serving cell information may be indicated by a predetermined field of a predetermined DCI format (e.g., DCI format 1_0).
- the predetermined field may be, for example, a random access preamble index field (e.g., a Random Access Preamble index field).
- the preamble setting related to the non-serving cell may be configured to be applied only to PRACH transmission based on the PDCCH order (or may be configured not to be applied to collision-type PRACH transmission).
- the UE may control the PRACH transmission to have the indicated preamble according to the RACH settings of the non-serving cell.
- the UE may adjust the TA of one or more indicated cells after the PRACH based on the PDCCH order.
- Information regarding the TA may be received in a response signal (e.g., RAR) to the PRACH transmission.
- RAR response signal
- the following UE capabilities may be configured. Note that the following UE capabilities may be interpreted as parameters (e.g., higher layer parameters) configured in the UE from a network (e.g., a base station).
- UE capability information regarding whether or not to support a PDCCH order for a PRACH of a non-serving cell may be defined.
- UE capability information regarding the number of non-serving cells that support a PRACH based on a PDCCH order may be defined.
- UE capability information may be defined regarding whether or not to support CORESET via PDCCH order (e.g., CORESET related to the TCI state of non-serving cells).
- UE capability information regarding whether or not to support SSB of non-serving cell based PRACH or CSI-RS of non-serving cell based PRACH may be defined.
- UE capability information may be defined regarding whether or not an extension of a specific DCI format (e.g., DCI format 1_0) used for a PDCCH order of a non-serving cell is supported.
- UE capability information regarding the number of non-serving cells that support a PRACH based on a PDCCH order may be defined.
- UE capability information regarding whether or not the association of non-serving cells with a random access preamble index (e.g., ra-PreambleIndex) is supported may be defined.
- UE capability information regarding the number of non-serving cells associated with a random access preamble index (e.g., ra-PreambleIndex) (e.g., the number that the UE can support) may be defined.
- one cell index can be specified.
- RACH Radio Access Management Function
- candidate cells for example, the L1 beam measurement result is the same for multiple cells
- TAG IDs are different between them
- the inventors therefore came up with a wireless communication method that can appropriately control UL transmission even when UL transmission is possible to multiple candidate cells.
- A/B and “at least one of A and B” may be interpreted as interchangeable. Also, in this disclosure, “A/B/C” may mean “at least one of A, B, and C.”
- Radio Resource Control RRC
- RRC parameters RRC parameters
- RRC messages higher layer parameters, fields, information elements (IEs), settings, etc.
- IEs information elements
- CE Medium Access Control
- update commands activation/deactivation commands, etc.
- the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocols (e.g., NR Positioning Protocol A (NRPPa)/LTE Positioning Protocol (LPP)) messages), or a combination of these.
- RRC Radio Resource Control
- MAC Medium Access Control
- LPP LTE Positioning Protocol
- the MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc.
- the broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- the physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.
- DCI Downlink Control Information
- UCI Uplink Control Information
- cell group serving cell group, master cell group (MCG), and secondary cell group (SCG) may be interchangeable.
- L1/L2, L1/L2 signaling, and DCI/MAC CE may be interchangeable.
- a serving cell may be replaced with a cell that transmits a PDSCH.
- a candidate cell may refer to a cell that is a candidate to become a serving cell through L1/L2 inter-cell mobility.
- cell, PCI, serving cell, source serving cell, source cell, CC, BWP, BWP in CC, and band may be interchangeable.
- cell, PCI, cell with additional PCI, additional cell, other cell, non-serving cell, cell with different PCI, candidate cell, candidate serving cell, cell with PCI different from the PCI of the current serving cell, another serving cell, and target cell may be interchangeable.
- switch, change, and update may be interchangeable.
- Serving cell may be interchangeable with serving cell before switch or serving cell after switch.
- the source cell and the source cell group may be read as interchangeable.
- the candidate cell, the candidate cell group, the TA, and the TAG may be read as interchangeable.
- the candidate cell index and the TAG ID may be read as interchangeable.
- the TAG and the TAG ID may be read as interchangeable.
- the number of candidate cells, the number of candidate cell indexes, and the number of PRACH transmissions may be read as interchangeable.
- the frequency range (FR) is exemplified by FR1 and FR2, but is not limited to these.
- FR1/FR2 may be read as FR3/FR4.
- FR1 and FR2 may be read as interchangeable.
- the UE may receive an indication of one or more candidate cell indexes for PRACH transmission by PDCCH (DCI), and transmit PRACH to one or more candidate cells corresponding to the candidate cell indexes based on the indication.
- the RACH procedure is started by indicating RACH by PDCCH.
- the candidate cell index and TAG ID may be read as mutually interchangeable.
- aspect 1-1 a case will be described in which the UE is instructed to transmit PRACH once by a PDCCH order or a MAC CE, or is configured to transmit PRACH once by an RRC, or is predefined to transmit PRACH once by a specification.
- the UE transmits PRACH to only one candidate cell.
- the UE transmits PRACH to only one candidate cell.
- multiple candidate cells may receive the PRACH depending on the implementation of the network.
- the RACH occasion (RO) settings of those candidate cells may be the same.
- aspect 1-2 a case will be described in which the UE is instructed by a PDCCH order or a MAC CE to transmit a PRACH with a number of times greater than 1, or is configured by the RRC with a number of times greater than 1 as the number of times of PRACH transmission, or is predefined by a specification with a number of times greater than 1.
- the UE may transmit a PRACH to one candidate cell.
- RAR monitoring is not indicated by a PDCCH order or MAC CE, or configured by RRC, or not predefined (UE does not receive RAR), at least one of options 1 to 3 below applies.
- the UE transmits the PRACH to only one candidate cell.
- the reserved bits may be used for the other bits. This does not change the total number of bits in the DCI format. For example, if N candidate cells or TAGs are configured by the RRC, the log 2 N reserved bits are used for the index of the other candidate cell or TAG. If the UE transmits the PRACH to only one candidate cell, the other bits may all be set to 0.
- multiple candidate cell indices or TAG IDs for PRACH transmission may be indicated/configured by higher layer signaling/physical layer signaling.
- the field for configuring/indicating the cells may be extended.
- Options 1 to 3 may be used interchangeably between FR1 and FR2, or may be used in common.
- PRACH transmission for another candidate cell or TAG may be triggered by MAC CE or RRC.
- This embodiment may be applied only when RAR monitoring is indicated by a PDCCH order or MAC CE, configured by RRC, or predefined in the specification. If RAR is configured, PRACH may be transmitted to only one candidate cell.
- This embodiment may be applied to only non-contention random access (Contention Free Random Access (CFRA)), only contention based random access (Contention based Random Access (CBRA)), or both CFRA and CBRA. Which to apply may be specified in the specifications, may be set/indicated by higher layer signaling/physical layer signaling, or may be reported as UE capability information.
- CFRA Contention Free Random Access
- CBRA contention based Random Access
- Example 1 A specific example of the correspondence between the DCI field and the candidate cell index in options 2-1 and 2-2 will be described.
- the number of bits of the DCI may be changed according to the number of candidate cells/TAGs set/instructed by the RRC/MAC CE.
- the candidate cell index and the TAG ID may be interchangeable.
- the DCI in each specific example may be a DCI included in a PDCCH (PDCCH order) that indicates a PRACH.
- FIG. 15 is a diagram showing an example of cell configuration in the first embodiment.
- #0 to #7 in FIG. 15 indicate candidate cell indexes. Furthermore, each candidate cell is defined in one MAC entity. #0, #1, and #2 indicate serving cells. Cell #0 is an SpCell, and cells #1 and #2 are SCells. #3 to #6 indicate candidate cells.
- FIG. 16 is a diagram showing the relationship between the number of candidate cells/TAGs set by RRC and the number of DCI bits. As shown in FIG. 16, different numbers of DCI bits are used depending on the number of candidate cells/TAGs set by RRC.
- FIG. 17A is a diagram showing an example of the allocation of candidate cell indexes to the DCI field when the number of candidate cells/TAGs is 8.
- the number of DCI bits is 3.
- the DCI field is "000", it may indicate that there are no multiple candidate cells for TA acquisition (there is only one).
- Figure 17B is a diagram showing an example of the allocation of candidate cell indexes to the DCI field when the number of candidate cells/TAGs is 4.
- the number of DCI bits is 2.
- the DCI field is "00", it may indicate that there are no multiple candidate cells for TA acquisition (there is only one).
- FIG. 17C is a diagram showing an example of the allocation of candidate cell indexes to the DCI field when the number of candidate cells/TAGs is two.
- the number of DCI bits is one.
- the DCI field is "0", it may indicate that there are no multiple candidate cells for TA acquisition (there is only one).
- the UE can obtain indications of all candidate cell indexes/TAG IDs via DCI.
- Example 2 Another example of the correspondence between DCI fields and candidate cell indexes in Options 2-1 and 2-2 will be described.
- N candidate cells or TAGs are configured by the RRC and the number of DCI bits is less than log 2 N, any of the following Examples 1 to 3 may be applied.
- Example 1 The indexes or TAG IDs of the candidate cells are assigned to the DCI field in ascending or descending order of index.
- FIG. 18A is a diagram showing an example in which candidate cell indexes are assigned to DCI fields in ascending order of index.
- the candidate cell indexes are assigned to DCI fields in the order of 1, 2, and 3.
- FIG. 18B is a diagram showing an example in which candidate cell indexes are assigned to DCI fields in descending order of index.
- the candidate cell indexes are assigned to DCI fields in the order of 7, 6, and 5.
- Example 2 The UE receives a parameter corresponding to the candidate cell index or TAG ID through higher layer signaling (eg, MAC CE or RRC), and the parameter is assigned to a DCI field.
- higher layer signaling eg, MAC CE or RRC
- Figure 19 is a diagram showing an example of a DCI field when a parameter corresponding to a candidate cell index or TAG ID is set/indicated by higher layer signaling.
- one of Parameter#0 to 3 is assigned to the DCI field.
- Parameter#0 is assigned one of the candidate cell indexes ⁇ 1, 2, ... 7 ⁇
- Parameter#1 is assigned one of the candidate cell indexes ⁇ 1, 2, ... 5 ⁇
- Parameter#2 is assigned one of the candidate cell indexes ⁇ 6, 7 ⁇ .
- Example 3 One or more candidate cell indices or TAG IDs, or parameters corresponding thereto, are predefined in a specification or indicated/configured by higher layer signaling (e.g., RRC or MAC CE), and one or more candidate cell indices or TAG IDs, or parameters corresponding thereto, are indicated in the DCI.
- higher layer signaling e.g., RRC or MAC CE
- Figure 20 is a diagram showing an example in which multiple candidate cell indexes are indicated by DCI.
- candidate cell indexes 1 and 7 are assigned to DCI bit "01”
- candidate cell indexes 2 and 6 are assigned to DCI bit "10”
- candidate cell indexes 3 and 5 are assigned to DCI bit "11”.
- the candidate cell indexes in Figure 20 are a combination of the examples in Figures 18A and 18B, but the combinations are not limited to this example.
- parameters #0 and #2 may be assigned to DCI bit "01"
- parameters #1 and #0 may be assigned to DCI bit "10”
- parameters #2 and #1 may be assigned to DCI bit "11”. It is assumed that candidate cell indexes are specified/set in advance for parameters #0 to #2 by higher layer signaling, as in the example of FIG. 19.
- DCI field "00" in Figures 18 to 20 may indicate that there are no multiple cells that are candidates for TA acquisition (there is only one), similar to Figures 17A to 17C.
- two candidate cell indexes are assigned to one DCI field, but two candidate cell indexes may also be assigned to one DCI field.
- the UE can obtain an indication of the required candidate cell index/TAG ID from the DCI even if the number of DCI bits is small. This allows the number of DCI bits to be reduced.
- Example 3 As specific examples of option 3 of aspect 1-2, the following examples of options 3-1 and 3-2 will be described.
- one candidate cell index may be predefined and another candidate cell index may be indicated or configured by higher layer signaling (e.g., RRC or MAC CE).
- FIG. 21 shows an example of Option 3-1.
- one DCI field indicates one of candidate cell indexes #0 to #7 and one of parameters #0 to #7. Parameters #0 to #7 are assigned different candidate cell indexes in advance by higher layer signaling.
- the bit size of the DCI is determined by the list configured by the higher layer signaling.
- FIG. 22 shows an example of Option 3-2.
- one of Parameter #0 to #7 is indicated in one DCI field.
- One or more candidate cell indices are assigned to Parameter #0 to #7 by higher layer signaling.
- the UE can obtain indications of multiple candidate cell indexes/TAG IDs from one DCI field. This makes it possible to suppress an increase in the number of DCI bits even when there are a large number of candidate cells transmitting PRACH.
- the number of PRACH transmissions may be indicated by the PDCCH.
- the number of DCI bits corresponds to the number of PRACH transmissions, and the number of PRACH transmissions is M, a log 2 M-bit DCI field may be used.
- the number of DCI bits may be changed according to the number of PRACH transmissions set/instructed by the RRC/MAC CE.
- the number of PRACH transmissions may be the same as the number of candidate cells. That is, the UE may transmit one PRACH for one candidate cell. The UE may determine the number of candidate cells based on the indicated number of PRACH transmissions.
- FIG. 23 is a diagram showing an example of processing in aspect 1-3.
- the source cell/cell group transmits a PRACH instruction to the UE via the PDCCH. Then, in response to this instruction, the UE transmits a PRACH to the candidate cell/cell group.
- FIG. 24 is a diagram showing the relationship between the number of PRACH transmissions set by the RRC and the number of DCI bits. As shown in FIG. 24, different numbers of DCI bits are used depending on the number of PRACH transmissions set by the RRC.
- FIG. 25A is a diagram showing an example of allocation of the number of PRACH transmissions to the DCI field when the maximum number of PRACH transmissions is 8.
- the number of DCI bits is 3.
- FIG. 25B is a diagram showing an example of allocation of the number of PRACH transmissions to the DCI field when the maximum number of PRACH transmissions is 4.
- the number of DCI bits is 2.
- FIG. 25C is a diagram showing an example of allocation of the number of PRACH transmissions to the DCI field when the maximum number of PRACH transmissions is 2.
- the number of DCI bits is 1.
- the UE can obtain an indication of the number of PRACH transmissions in all cases through DCI.
- the DCI fields are assigned in ascending or descending order of the number of PRACH transmissions.
- FIG. 26A is a diagram showing an example in which the number of PRACH transmissions is assigned to the DCI field in ascending order.
- the number of PRACH transmissions is assigned to the DCI field in the order of 1, 2, 3, and 4.
- Figure 26B is a diagram showing a first example in which the number of PRACH transmissions is assigned to the DCI field in descending order.
- the number of PRACH transmissions is assigned to the DCI field in the order of 1, M, M-1, M-2.
- DCI bit "00" is assigned 1 time, and other DCI bits are assigned in descending order of the number of PRACH transmissions.
- FIG. 26C is a diagram showing a second example in which the number of PRACH transmissions is assigned to the DCI field in descending order.
- the number of PRACH transmissions is assigned to the DCI field in the order of M, M-1, M-2, and M-3.
- the number of PRACH transmissions is set/instructed by higher layer signaling (RRC or MAC CE), and a parameter corresponding to the number of PRACH transmissions is associated with the DCI field.
- RRC higher layer signaling
- a parameter corresponding to the number of PRACH transmissions is associated with the DCI field.
- FIG. 27 is a diagram showing an example of a DCI field when the number of PRACH transmissions is set/instructed by higher layer signaling.
- 1 and Parameter#0-2 are assigned to each DCI field.
- Parameter#0 is assigned one of the candidate cell indices ⁇ 2, 3,...M ⁇
- Parameter#1 is assigned one of the candidate cell indices ⁇ 2, 3,...M-3 ⁇
- Parameter#2 is assigned one of the candidate cell indices ⁇ M-2, M-1, M ⁇ .
- DCI bits "00" may also be assigned a parameter set/instructed by higher layer signaling.
- the UE can obtain an indication of the number of PRACH transmissions from the DCI even if the number of DCI bits is small. This makes it possible to reduce the number of DCI bits.
- the candidate cell index or TAG ID may be indicated by the MAC CE or configured by the RRC.
- the maximum value of the candidate cell index or TAG ID may be X.
- the UE may receive the setting/indication of X by higher layer signaling/physical layer signaling, or may be transmitted as UE capability information.
- the candidate cell index or TAG ID may correspond to an SpCell.
- candidate cell indexes or TAG IDs other than 0 may be assigned in ascending or descending order of frequency.
- a RACH-less method is triggered for multiple TAGs or candidate cells indicated by the DCI.
- the RACH-less method means that no random access procedure is used, and will be described in detail later.
- the UE may receive an indication of one candidate cell index or timing advance group (TAG) ID for PRACH transmission, and transmit PRACH to the one candidate cell.
- TAG timing advance group
- another candidate cell or TAG means a candidate cell, TAG having an index/ID other than the one candidate cell index or timing advance group (TAG) ID.
- the DCI of this embodiment may be included in the above-mentioned PDCCH order.
- Option 1 The UE transmits the PRACH only for one candidate cell and the RACH-less method is not triggered for other candidate cells or TAGs.
- Option 2 The UE transmits a PRACH to one candidate cell, and a RACH-less method is triggered for another candidate cell or TAG. In this case, at least one of the following options 2-1 to 2-3 is applied.
- ⁇ Option 2-1>> A RACH-less method for one candidate cell or TAG is triggered. Another candidate cell or TAG is indicated by one of the following options 2-1-1 to 2-1-3.
- Another candidate cell or TAG is indicated by another bit in the DCI other than the one candidate cell or TAG ID bit. If N candidate cells or TAGs are configured by RRC, the reserved bits of log 2 N (R bits) are used for the index of another candidate cell or TAG. If the RACH-less method is not triggered, the reserved bits of log 2 N are all set to 0. This does not change the total number of bits in the DCI format.
- the DCI indicates another candidate cell or TAG.
- the UE receives the configuration of another candidate cell or TAG by RRC.
- the RACH-less method for multiple candidate cells or TAGs among the candidate cells or TAGs configured in the RRC may be triggered by the DCI/MAC CE (or may receive a trigger by the DCI/MAC CE).
- the UE receives another candidate cell or TAG configuration by RRC.
- the RACH-less method for all candidate cells or TAGs configured by RRC may be triggered.
- the following option 2-3-1 or option 2-3-2 may be applied.
- the UE receives a DCI/MAC CE that includes a flag for triggering the RACH-less method, which may be a reserved bit (R), for example, where 0 means no trigger and 1 means trigger.
- R reserved bit
- the UE receives a DCI/MAC CE that includes a new field indicating a flag for triggering the RACH-less method, in which case the total number of bits in the DCI/MAC CE increases.
- the flag may be, for example, 0 for no trigger and 1 for trigger.
- the RACH-less method for a candidate cell or TAG other than the candidate cell indicated by the PDCCH order may be triggered by the MAC CE or RRC.
- the processing of this embodiment may be applied to only CFRA, only CBRA, or both CFRA and CBRA. Whether CFRA or CBRA is to be applied may be specified in the specifications, or may be set/instructed to the UE by higher layer signaling/physical layer signaling. In addition, whether CFRA or CBRA is to be applied may be transmitted as capability information of the UE.
- the cell configuration of this embodiment may be the same as the cell configuration of FIG. 15, for example.
- any of the examples of FIG. 16 to FIG. 20 may be applied.
- the RACH-less method is a mechanism that does not trigger a random access procedure by the NW or UE for TA acquisition.
- the RACH-based method e.g., RACH indicated by PDCCH, RACH triggered by UE
- the RACH-less method may be configured/instructed to the UE by the RRC or MAC CE, or may be configured by the UE.
- Figure 28 shows the procedure of the RACH-less method.
- the UE receives a candidate cell configuration from the source cell/cell group using an RRC message.
- DL synchronization is performed between the UE, the source cell/cell group, and the candidate cell/cell group.
- the UE performs L1 measurements and transmits them to the source cell/cell group and the candidate cell/cell group.
- the UE or the source cell/cell group triggers TA acquisition for the candidate cell.
- the UE performs TA measurement for the candidate cell and reports it to at least one of the source cell/cell group and the candidate cell/cell group.
- the TA of the candidate cell is updated and notified to the UE from the source cell/cell group.
- Figure 29 shows an overview of the RACH-less method. As shown in Figure 29, the following steps are performed in order: UE reconfiguration, DL synchronization, UL synchronization, cell switch, and UL synchronization. TA acquisition is performed during UL synchronization.
- the NW can instruct the UE on the number of PRACH transmissions/candidate cells.
- the NW can instruct the UE on the number of PRACH transmissions/candidate cells.
- how the UE determines the resources/occasions for each PRACH is described.
- the PRACH resources/opportunities for the serving cell may be as per existing specifications.
- the PRACH resources/opportunities for other (candidate cells) may be instructed/configured to the UE by higher layer signaling, may be determined by a predefined rule based on the PRACH resources/opportunities of the serving cell, or may be derived by the UE based on an offset instructed/configured from higher layer signaling.
- PRACH resources/opportunities may be indicated to the UE by the DCI in a manner similar to aspects 1-3. For example, if each candidate cell has a different RACH opportunity configuration, the UE may receive an indication of one or more RACH opportunities by the DCI. If one preamble index is actually capable of functioning, the UE may receive one or more preamble indexes by the DCI. It may also receive one or more SSB indexes if required for FR2.
- each field of the DCI and the cell ID may be predefined by the specifications or may be set by higher layer signaling so that the UE can correctly understand the indicated PRACH resources of each cell. If it is predefined that the DCI has one indication field for a particular indication, this indication may apply to all indicated cell IDs. For example, if there is only one preamble index indication field, this may mean that this preamble index is used for the PRACH of each indicated cell.
- the processing of this embodiment may be applied to only CFRA, only CBRA, or both CFRA and CBRA. Whether CFRA or CBRA is to be applied may be specified in the specifications, or may be set/instructed to the UE by higher layer signaling/physical layer signaling. In addition, whether CFRA or CBRA is to be applied may be transmitted as capability information of the UE.
- any information may be notified to the UE (from a network (NW) (e.g., a base station (BS))) (in other words, any information is received from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.
- NW network
- BS base station
- the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader that is not specified in existing standards.
- LCID Logical Channel ID
- the notification When the notification is made by a DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.
- RNTI Radio Network Temporary Identifier
- CRC Cyclic Redundancy Check
- notification of any information to the UE in the above-mentioned embodiments may be performed periodically, semi-persistently, or aperiodically.
- notification of any information from the UE (to the NW) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.
- physical layer signaling e.g., UCI
- higher layer signaling e.g., RRC signaling, MAC CE
- a specific signal/channel e.g., PUCCH, PUSCH, PRACH, reference signal
- the MAC CE may be identified by including a new LCID in the MAC subheader that is not specified in existing standards.
- the notification may be transmitted using PUCCH or PUSCH.
- notification of any information from the UE may be performed periodically, semi-persistently, or aperiodically.
- At least one of the above-mentioned embodiments may be applied when a specific condition is satisfied, which may be specified in a standard or may be notified to a UE/BS using higher layer signaling/physical layer signaling.
- At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.
- the particular UE capability may indicate at least one of the following: - Supporting specific processing/operations/control/information for at least one of the above embodiments. - Maximum number of candidate cell indices, TAG IDs. Supports RACH-less methods.
- the above-mentioned specific UE capabilities may be capabilities that are applied across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination of a cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities per Feature Set (FS) or Feature Set Per Component-carrier (FSPC).
- FR1 Frequency Range 1
- FR2 FR2, FR3, FR4, FR5, FR2-1, FR2-2
- SCS subcarrier Spacing
- FS Feature Set
- FSPC Feature Set Per Component-carrier
- the specific UE capabilities may be capabilities that are applied across all duplexing methods (commonly regardless of the duplexing method), or may be capabilities for each duplexing method (e.g., Time Division Duplex (TDD) and Frequency Division Duplex (FDD)).
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- At least one of the above-mentioned embodiments may be applied when the UE configures/activates/triggers specific information related to the above-mentioned embodiments (or performs the operations of the above-mentioned embodiments) by higher layer signaling/physical layer signaling.
- the specific information may be any RRC parameters for a specific release (e.g., Rel. 18/19), etc.
- the UE may, for example, apply Rel. 15/16 operations.
- [Appendix 1] a receiver for receiving, via a physical link downlink control channel (PDCCH), an indication of one or more candidate cell indices or timing advance group (TAG) IDs for a physical random access channel (PRACH) transmission; A control unit that controls PRACH transmission to a candidate cell corresponding to the candidate cell index or the TAG ID based on the instruction; A terminal having the above configuration.
- PDCCH physical link downlink control channel
- TAG timing advance group
- PRACH physical random access channel
- a terminal having the above configuration.
- DCI downlink control information
- the receiving unit receives a parameter corresponding to the candidate cell index or the TAG ID by higher layer signaling, 3.
- a specific field in downlink control information (DCI) in the PDCCH indicates the parameter.
- DCI downlink control information
- DCI downlink control information
- Wired communication system A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below.
- communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these.
- FIG. 30 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 (which may simply be referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) specified by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.
- LTE Long Term Evolution
- 3GPP Third Generation Partnership Project
- 5G NR 5th generation mobile communication system New Radio
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.
- E-UTRA Evolved Universal Terrestrial Radio Access
- EN-DC E-UTRA-NR Dual Connectivity
- NE-DC NR-E-UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN).
- the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (e.g., dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).
- dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).
- gNBs NR base stations
- N-DC Dual Connectivity
- the wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged within the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1.
- a user terminal 20 may be located within at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.
- the user terminal 20 may be connected to at least one of the multiple base stations 10.
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- Macro cell C1 may be included in FR1
- small cell C2 may be included in FR2.
- FR1 may be a frequency band below 6 GHz (sub-6 GHz)
- FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.
- the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication).
- wire e.g., optical fiber conforming to the Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication e.g., NR communication
- base station 11 which corresponds to the upper station
- IAB Integrated Access Backhaul
- base station 12 which corresponds to a relay station
- the base station 10 may be connected to the core network 30 directly or via another base station 10.
- the core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the core network 30 may include network functions (Network Functions (NF)) such as, for example, a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM).
- NF Network Functions
- UPF User Plane Function
- AMF Access and Mobility management Function
- SMF Session Management Function
- UDM Unified Data Management
- AF Application Function
- DN Data Network
- LMF Location Management Function
- OAM Operation, Administration and Maintenance
- the user terminal 20 may be a terminal that supports at least one of the communication methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the radio access method may also be called a waveform.
- other radio access methods e.g., other single-carrier transmission methods, other multi-carrier transmission methods
- a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- SIB System Information Block
- PDSCH User data, upper layer control information, System Information Block (SIB), etc.
- SIB System Information Block
- PUSCH User data, upper layer control information, etc.
- MIB Master Information Block
- PBCH Physical Broadcast Channel
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.
- DCI Downlink Control Information
- the DCI for scheduling the PDSCH may be called a DL assignment or DL DCI
- the DCI for scheduling the PUSCH may be called a UL grant or UL DCI.
- the PDSCH may be interpreted as DL data
- the PUSCH may be interpreted as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space may be used to detect the PDCCH.
- the CORESET corresponds to the resources to search for DCI.
- the search space corresponds to the search region and search method of PDCCH candidates.
- One CORESET may be associated with one or multiple search spaces. The UE may monitor the CORESET associated with a search space based on the search space configuration.
- a search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that the terms “search space,” “search space set,” “search space setting,” “search space set setting,” “CORESET,” “CORESET setting,” etc. in this disclosure may be read as interchangeable.
- the PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and a scheduling request (SR).
- UCI uplink control information
- CSI channel state information
- HARQ-ACK Hybrid Automatic Repeat reQuest ACKnowledgement
- ACK/NACK ACK/NACK
- SR scheduling request
- the PRACH may transmit a random access preamble for establishing a connection with a cell.
- downlink, uplink, etc. may be expressed without adding "link.”
- various channels may be expressed without adding "Physical” to the beginning.
- a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted.
- a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- a signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for PBCH) may be called an SS/PBCH block, an SS Block (SSB), etc.
- the SS, SSB, etc. may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS uplink reference signal
- DMRS may also be called a user equipment-specific reference signal (UE-specific Reference Signal).
- the base station 31 is a diagram showing an example of a configuration of a base station according to an embodiment.
- the base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks of the characteristic parts of this embodiment, and the base station 10 may also be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be configured from a controller, a control circuit, etc., which are described based on a common understanding in the technical field to which this disclosure pertains.
- the control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc.
- the control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc.
- the control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120.
- the control unit 110 may perform call processing of communication channels (setting, release, etc.), status management of the base station 10, management of radio resources, etc.
- the transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transceiver unit 120 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.
- the transceiver unit 120 may be configured as an integrated transceiver unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.
- the transmitting/receiving antenna 130 can be configured as an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.
- the transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.
- the transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transceiver 120 may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc., on data and control information obtained from the control unit 110, and generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transceiver 120 may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- channel coding which may include error correction coding
- DFT Discrete Fourier Transform
- IFFT Inverse Fast Fourier Transform
- the transceiver unit 120 may perform modulation, filtering, amplification, etc., on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.
- the transceiver unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.
- the transceiver 120 may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.
- reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.
- FFT Fast Fourier Transform
- IDFT Inverse Discrete Fourier Transform
- filtering demapping
- demodulation which may include error correction decoding
- MAC layer processing which may include error correction decoding
- the transceiver 120 may perform measurements on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal.
- the measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc.
- RSRP Reference Signal Received Power
- RSSI Received Signal Strength Indicator
- the measurement results may be output to the control unit 110.
- the transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes providing NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.
- devices included in the core network 30 e.g., network nodes providing NF
- other base stations 10, etc. may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.
- the transmitter and receiver of the base station 10 in this disclosure may be configured with at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission path interface 140.
- the transceiver 120 may transmit an indication of one or more candidate cell indices or timing advance group (TAG) IDs for a physical random access channel (PRACH) transmission via the physical link downlink control channel (PDCCH).
- TAG timing advance group
- the control unit 110 may control the reception of a PRACH for a candidate cell corresponding to the candidate cell index or the TAG ID transmitted based on the instruction.
- the transceiver 120 may transmit, via the physical link downlink control channel (PDCCH), an indication of one candidate cell index or timing advance group (TAG) ID for a physical random access channel (PRACH) transmission, and may transmit a trigger for a method that does not use a random access procedure for one or more other candidate cells or TAGs.
- PDCCH physical link downlink control channel
- TAG timing advance group
- PRACH physical random access channel
- the control unit 110 may control the reception of a PRACH for a candidate cell corresponding to the candidate cell index or the TAG ID transmitted based on the instruction.
- the user terminal 20 includes a control unit 210, a transmitting/receiving unit 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 the functional blocks of the characteristic parts of this embodiment, and the user terminal 20 may also be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be configured from a controller, a control circuit, etc., which are described based on a common understanding in the technical field to which this disclosure pertains.
- the control unit 210 may control signal generation, mapping, etc.
- the control unit 210 may control transmission and reception using the transceiver unit 220 and the transceiver antenna 230, measurement, etc.
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.
- the transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transceiver unit 220 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.
- the transceiver unit 220 may be configured as an integrated transceiver unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the reception unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.
- the transmitting/receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.
- the transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.
- the transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transceiver 220 may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data and control information acquired from the controller 210, and generate a bit string to be transmitted.
- RLC layer processing e.g., RLC retransmission control
- MAC layer processing e.g., HARQ retransmission control
- the transceiver 220 may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- Whether or not to apply DFT processing may be based on the settings of transform precoding.
- the transceiver unit 220 transmission processing unit 2211
- the transceiver unit 220 may perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, it is not necessary to perform DFT processing as the above-mentioned transmission processing.
- the transceiver unit 220 may perform modulation, filtering, amplification, etc., on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.
- the transceiver unit 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.
- the transceiver 220 may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.
- reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.
- the transceiver 220 may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal.
- the measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc.
- the measurement results may be output to the control unit 210.
- the measurement unit 223 may derive channel measurements for CSI calculation based on channel measurement resources.
- the channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources.
- the measurement unit 223 may derive interference measurements for CSI calculation based on interference measurement resources.
- the interference measurement resources may be at least one of NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, etc.
- CSI-IM may be called CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS.
- CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be read as interchangeable.
- the transmitting unit and receiving unit of the user terminal 20 in this disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.
- the transceiver 220 may receive an indication of one or more candidate cell indices or timing advance group (TAG) IDs for a physical random access channel (PRACH) transmission via a physical link downlink control channel (PDCCH).
- TAG timing advance group
- the control unit 210 may control PRACH transmission to the candidate cell corresponding to the candidate cell index or the TAG ID based on the instruction.
- a specific field in the downlink control information (DCI) in the PDCCH may indicate multiple candidate cell indexes or multiple TAG IDs.
- the transceiver 220 may receive parameters corresponding to the candidate cell index or the TAG ID by higher layer signaling.
- a specific field in the downlink control information (DCI) in the PDCCH may indicate the parameters.
- a specific field in the downlink control information (DCI) in the PDCCH may indicate the number of times the PRACH is transmitted.
- the transceiver 220 may receive an indication of one candidate cell index or timing advance group (TAG) ID for a physical random access channel (PRACH) transmission via a physical link downlink control channel (PDCCH), and may receive a trigger for a method that does not use a random access procedure for one or more other candidate cells or TAGs.
- TAG timing advance group
- PRACH physical random access channel
- PDCCH physical link downlink control channel
- the control unit 210 may control PRACH transmission to the candidate cell corresponding to the candidate cell index or the TAG ID based on the instruction.
- the other candidate cell or TAG may be indicated in a bit other than the bit of the one candidate cell index or TAG ID.
- the transceiver unit 220 may receive the setting of the other candidate cell or TAG via Radio Resource Control (RRC), and may receive a trigger for a method that does not use the random access procedure for multiple candidate cells or TAGs among the candidate cells or TAGs set in the RRC via downlink control information (DCI) or medium access control element (MAC CE).
- RRC Radio Resource Control
- DCI downlink control information
- MAC CE medium access control element
- the transceiver unit 220 may receive the configuration of the other candidate cell or TAG via Radio Resource Control (RRC), and trigger a method that does not use the random access procedure for all candidate cells or TAGs configured by the RRC.
- RRC Radio Resource Control
- each functional block may be realized using one device that is physically or logically coupled, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (for example, using wires, wirelessly, etc.).
- the functional blocks may be realized by combining the one device or the multiple devices with software.
- the functions include, but are not limited to, judgement, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment.
- a functional block (component) that performs the transmission function may be called a transmitting unit, a transmitter, and the like. In either case, as mentioned above, there are no particular limitations on the method of realization.
- a base station, a user terminal, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 33 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment.
- the above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.
- the terms apparatus, circuit, device, section, unit, etc. may be interpreted as interchangeable.
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figures, or may be configured to exclude some of the devices.
- processor 1001 may be implemented by one or more chips.
- the functions of the base station 10 and the user terminal 20 are realized, for example, by loading specific software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communications via the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.
- the processor 1001 for example, runs an operating system to control the entire computer.
- the processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, etc.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- etc. may be realized by the processor 1001.
- the processor 1001 also reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- the programs used are those that cause a computer to execute at least some of the operations described in the above embodiments.
- the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks.
- Memory 1002 is a computer-readable recording medium and may be composed of at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.
- ROM Read Only Memory
- EPROM Erasable Programmable ROM
- EEPROM Electrically EPROM
- RAM Random Access Memory
- Memory 1002 may also be called a register, cache, main memory, etc.
- Memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.
- Storage 1003 is a computer-readable recording medium and may be composed of at least one of a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium.
- Storage 1003 may also be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.
- the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the above-mentioned transmitting/receiving unit 120 (220), transmitting/receiving antenna 130 (230), etc. may be realized by the communication device 1004.
- the transmitting/receiving unit 120 (220) may be implemented as a transmitting unit 120a (220a) and a receiving unit 120b (220b) that are physically or logically separated.
- the input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside.
- the output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside.
- the input device 1005 and the output device 1006 may be integrated into one structure (e.g., a touch panel).
- each device such as the processor 1001 and memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between each device.
- the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using the hardware.
- the processor 1001 may be implemented using at least one of these pieces of hardware.
- a channel, a symbol, and a signal may be read as mutually interchangeable.
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may be composed of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting a radio frame may be called a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.
- the numerology may be a communication parameter that is applied to at least one of the transmission and reception of a signal or channel.
- the numerology may indicate, for example, at least one of the following: SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame configuration, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.
- SCS SubCarrier Spacing
- TTI Transmission Time Interval
- radio frame configuration a specific filtering process performed by the transceiver in the frequency domain
- a specific windowing process performed by the transceiver in the time domain etc.
- a slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.).
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a time unit based on numerology.
- a slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A.
- a PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.
- a radio frame, a subframe, a slot, a minislot, and a symbol all represent time units when transmitting a signal.
- a different name may be used for a radio frame, a subframe, a slot, a minislot, and a symbol, respectively.
- the time units such as a frame, a subframe, a slot, a minislot, and a symbol in this disclosure may be read as interchangeable.
- one subframe may be called a TTI
- multiple consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI.
- at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms.
- the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.
- TTI refers to, for example, the smallest time unit for scheduling in wireless communication.
- a base station schedules each user terminal by allocating radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units.
- radio resources such as frequency bandwidth and transmission power that can be used by each user terminal
- the TTI may be a transmission time unit for a channel-coded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc.
- the time interval e.g., the number of symbols
- the time interval in which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum time unit of scheduling.
- the number of slots (minislots) that constitute the minimum time unit of scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
- a TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.
- a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms
- a short TTI e.g., a shortened TTI, etc.
- TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
- the number of subcarriers included in an RB may be the same regardless of numerology, and may be, for example, 12.
- the number of subcarriers included in an RB may be determined based on numerology.
- an RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI in length.
- One TTI, one subframe, etc. may each be composed of one or more resource blocks.
- one or more RBs may be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.
- PRB Physical RB
- SCG sub-carrier Group
- REG resource element group
- PRB pair an RB pair, etc.
- a resource block may be composed of one or more resource elements (REs).
- REs resource elements
- one RE may be a radio resource area of one subcarrier and one symbol.
- a Bandwidth Part which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by an index of the RB relative to a common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within the BWP.
- the BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be configured for a UE within one carrier.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, and symbols are merely examples.
- the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.
- the information, parameters, etc. described in this disclosure may be represented using absolute values, may be represented using relative values from a predetermined value, or may be represented using other corresponding information.
- a radio resource may be indicated by a predetermined index.
- the names used for parameters and the like in this disclosure are not limiting in any respect. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure.
- the various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any respect.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies.
- the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.
- information, signals, etc. may be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input/output via multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input/output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.
- a specific location e.g., memory
- Input/output information, signals, etc. may be overwritten, updated, or added to.
- Output information, signals, etc. may be deleted.
- Input information, signals, etc. may be transmitted to another device.
- the notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods.
- the notification of information in this disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals, or a combination of these.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc.
- the RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.
- the MAC signaling may be notified, for example, using a MAC Control Element (CE).
- CE MAC Control Element
- notification of specified information is not limited to explicit notification, but may be done implicitly (e.g., by not notifying the specified information or by notifying other information).
- the determination may be based on a value represented by a single bit (0 or 1), a Boolean value represented by true or false, or a comparison of numerical values (e.g., with a predetermined value).
- Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
- Software, instructions, information, etc. may also be transmitted and received via a transmission medium.
- a transmission medium For example, if the software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave, etc.), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.
- wired technologies such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)
- wireless technologies such as infrared, microwave, etc.
- Network may refer to the devices included in the network (e.g., base stations).
- the antenna port may be interchangeably read as an antenna port for any signal/channel (e.g., a demodulation reference signal (DMRS) port).
- the resource may be interchangeably read as a resource for any signal/channel (e.g., a reference signal resource, an SRS resource, etc.).
- the resource may include time/frequency/code/space/power resources.
- the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.
- the above groups may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, etc.
- CDM Code Division Multiplexing
- RS Reference Signal
- CORESET Control Resource Set
- beam SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable.
- SRI SRS Resource Indicator
- CORESET CORESET pool
- PDSCH PUSCH
- codeword CW
- TB transport block
- RS etc.
- TCI state downlink TCI state
- DL TCI state downlink TCI state
- UL TCI state uplink TCI state
- unified TCI state common TCI state
- joint TCI state etc.
- QCL QCL
- QCL assumptions QCL relationship
- QCL type information QCL property/properties
- specific QCL type e.g., Type A, Type D
- specific QCL type e.g., Type A, Type D
- index identifier
- indicator indication, resource ID, etc.
- sequence list, set, group, cluster, subset, etc.
- TCI state ID may be interchangeable.
- TCI state ID may be interchangeable as “set of spatial relationship information (TCI state)", “one or more pieces of spatial relationship information”, etc.
- TCI state and TCI may be interchangeable.
- Spatial relationship information and spatial relationship may be interchangeable.
- Base Station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.
- a base station can accommodate one or more (e.g., three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))).
- RRH Remote Radio Head
- the term "cell” or “sector” refers to a part or the entire coverage area of at least one of the base station and base station subsystems that provide communication services in this coverage.
- a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control/operate based on the information.
- MS Mobile Station
- UE User Equipment
- a mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc.
- at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.
- the moving body in question refers to an object that can move, and the moving speed is arbitrary, and of course includes the case where the moving body is stationary.
- the moving body in question includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and objects mounted on these.
- the moving body in question may also be a moving body that moves autonomously based on an operating command.
- the moving object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned).
- a vehicle e.g., a car, an airplane, etc.
- an unmanned moving object e.g., a drone, an autonomous vehicle, etc.
- a robot manned or unmanned
- at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- FIG. 34 is a diagram showing an example of a vehicle according to an embodiment.
- the vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.
- various sensors including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58
- an information service unit 59 including a communication module 60.
- the drive unit 41 is composed of at least one of an engine, a motor, and a hybrid of an engine and a motor, for example.
- the steering unit 42 includes at least a steering wheel (also called a handlebar), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.
- the electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., an Input/Output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle.
- the electronic control unit 49 may also be called an Electronic Control Unit (ECU).
- ECU Electronic Control Unit
- Signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the motor current, a rotation speed signal of the front wheels 46/rear wheels 47 acquired by a rotation speed sensor 51, an air pressure signal of the front wheels 46/rear wheels 47 acquired by an air pressure sensor 52, a vehicle speed signal acquired by a vehicle speed sensor 53, an acceleration signal acquired by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 acquired by a brake pedal sensor 56, an operation signal of the shift lever 45 acquired by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 58.
- the information service unit 59 is composed of various devices, such as a car navigation system, audio system, speakers, displays, televisions, and radios, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices.
- the information service unit 59 uses information acquired from external devices via the communication module 60, etc., to provide various information/services (e.g., multimedia information/multimedia services) to the occupants of the vehicle 40.
- various information/services e.g., multimedia information/multimedia services
- the information service unit 59 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that perform output to the outside.
- input devices e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.
- output devices e.g., a display, a speaker, an LED lamp, a touch panel, etc.
- the driving assistance system unit 64 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving load, such as a millimeter wave radar, a Light Detection and Ranging (LiDAR), a camera, a positioning locator (e.g., a Global Navigation Satellite System (GNSS)), map information (e.g., a High Definition (HD) map, an Autonomous Vehicle (AV) map, etc.), a gyro system (e.g., an Inertial Measurement Unit (IMU), an Inertial Navigation System (INS), etc.), an Artificial Intelligence (AI) chip, and an AI processor, and one or more ECUs that control these devices.
- the driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize a driving assistance function or an autonomous driving function.
- the communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63.
- the communication module 60 transmits and receives data (information) via the communication port 63 between the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 that are provided on the vehicle 40.
- the communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication.
- the communication module 60 may be located either inside or outside the electronic control unit 49.
- the external device may be, for example, the above-mentioned base station 10 or user terminal 20.
- the communication module 60 may also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it may function as at least one of the base station 10 and user terminal 20).
- the communication module 60 may transmit at least one of the signals from the various sensors 50-58 described above input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication.
- the electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input.
- the PUSCH transmitted by the communication module 60 may include information based on the above input.
- the communication module 60 receives various information (traffic information, signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle.
- the information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 60).
- the communication module 60 also stores various information received from external devices in memory 62 that can be used by the microprocessor 61. Based on the information stored in memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided on the vehicle 40.
- the base station in the present disclosure may be read as a user terminal.
- each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- the user terminal 20 may be configured to have the functions of the base station 10 described above.
- terms such as "uplink” and "downlink” may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink").
- the uplink channel, downlink channel, etc. may be read as the sidelink channel.
- the user terminal in this disclosure may be interpreted as a base station.
- the base station 10 may be configured to have the functions of the user terminal 20 described above.
- operations that are described as being performed by a base station may in some cases be performed by its upper node.
- a network that includes one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) or a Serving-Gateway (S-GW)), or a combination of these.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in this disclosure may be used alone, in combination, or switched between depending on the implementation.
- the processing procedures, sequences, flow charts, etc. of each aspect/embodiment described in this disclosure may be rearranged as long as there is no inconsistency.
- the methods described in this disclosure present elements of various steps using an exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4th generation mobile communication system 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG x is, for example, an integer or decimal
- Future Radio Access FX
- GSM Global System for Mobile communications
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX (registered trademark)
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth (registered trademark), and other appropriate wireless communication methods, as well as next-generation systems that are expanded, modified,
- the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using designations such as “first,” “second,” etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “determining” may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking in a table, database, or other data structure), ascertaining, etc.
- Determining may also be considered to mean “determining” receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.
- judgment (decision) may be considered to mean “judging (deciding)” resolving, selecting, choosing, establishing, comparing, etc.
- judgment (decision) may be considered to mean “judging (deciding)” some kind of action.
- judgment (decision) may be interpreted interchangeably with the actions described above.
- expect may be read as “be expected”.
- "expect(s)" ("" may be expressed, for example, as a that clause, a to infinitive, etc.) may be read as “be expected".
- "does not expect" may be read as "be not expected".
- "An apparatus A is not expected" may be read as "An apparatus B other than apparatus A does not expect" (for example, if apparatus A is a UE, apparatus B may be a base station).
- the "maximum transmit power" referred to in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.
- connection and “coupled,” or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected” may be read as "accessed.”
- a and B are different may mean “A and B are different from each other.”
- the term may also mean “A and B are each different from C.”
- Terms such as “separate” and “combined” may also be interpreted in the same way as “different.”
- timing, time, duration, time instance, any time unit e.g., slot, subslot, symbol, subframe
- period occasion, resource, etc.
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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。
以上のように、UEが、1つ又は複数のセル/TRPに対してUL送信を行うことが検討されている。この場合の手順として、以下のシナリオ1又はシナリオ2が考えられる。なお、本開示において、サービングセルは、サービングセル内のTRPに読み替えられてもよい。layer1/layer2(L1/L2)、DCI/Medium Access Control Control Element(MAC CE)は、互いに読み替えられてもよい。本開示において、現在のサービングセルの物理セルID(Physical Cell Identity(PCI))とは異なるPCIを、単に「異なるPCI」と記載することがある。非サービングセル、異なるPCIを有するセル、追加セルは、互いに読み替えられてもよい。
シナリオ1は、例えば、マルチTRPのセル間モビリティに対応するが、マルチTRPのセル間モビリティに対応しないシナリオであっても構わない。
(2)UEは、異なるPCIに対応するTRPのビーム測定を実行し、ビーム測定結果をサービングセルに報告する。
(3)上記の報告に基づいて、異なるPCIに対応するTRPに関連付けられた送信設定指示(Transmission Configuration Indication(TCI))状態が、サービングセルからのL1/L2シグナリングによって、アクティブ化される。
(4)UEは、異なるPCIに対応するTRP上のUE個別(dedicated)チャネルを使用して送受信する。
(5)UEは、マルチTRPの場合も含めて、常にサービングセルをカバーしている必要がある。UEは、従来システムと同様に、サービングセルからの共通チャネル(ブロードキャスト制御チャネル(BCCH:Broadcast Control Channel)、ページングチャネル(PCH:Paging Channel))などを使用する必要がある。
シナリオ2では、L1/L2セル間モビリティを適用する。L1/L2セル間モビリティでは、RRC再設定せずに、ビーム制御などの機能を用いてサービングセル変更が可能である。言い換えると、ハンドオーバーせずに、追加セルとの送受信が可能である。ハンドオーバーのためにはRRC再接続が必要になるなど、データ通信不可期間が生じるので、ハンドオーバー不要なL1/L2セル間モビリティを適用することにより、サービングセル変更の際にもデータ通信を継続することができる。シナリオ2は、例えば、Rel.18において適用されてもよい。シナリオ2では、例えば、以下の手順が行われる。
(2)UEは、異なるPCIを使用したセルのビーム測定を実行し、測定結果をサービングセルに報告する。
(3)UEは、異なるPCIを持つセルの設定(サービングセル設定)を、上位レイヤシグナリング(例えばRRC)によって受信してもよい。つまり、サービングセル変更に関する事前設定が行われてもよい。この設定は、(1)における設定とともに行われてもよいし、別々に行われてもよい。
(4)上記の報告に基づいて、異なるPCIを持つセルのTCI状態は、サービングセルの変更に従ってL1/L2シグナリングによってアクティブ化されてもよい。TCI状態のアクティブ化及びサービングセルの変更は、別々に行われてもよい。
(5)UEは、サービングセル(サービングセルの想定)を変更し、予め設定されたUE個別のチャネルとTCI状態を使用して受信/送信を開始する。
図2は、サービングセルと候補セルの関連づけの例を示す図である。SpCell#0、SCell#1、又はSCell#2は、サービングセルであるとする。なお、SpCellは、スペシャルセル(プライマリセル(PCell)及びプライマリセカンダリセル(PSCell)を含む)を意味する。SCellは、セカンダリセルを意味する。SpCell#0は、候補セル#0-1、候補セル#0-2、候補セル#0-3に関連づけられる。SCell#1は、候補セル#1-1に関連づけられる。SCell#2は、候補セル#2-1、2-2に関連づけられる。このように、サービングセルには1以上の候補セル(候補サービングセル)が関連付けられてもよい。
Rel.17のセル間モビリティのように、ServingCellConfigにおける情報が、複数の候補セルに関する情報を含んでもよい。この場合、複数の候補セルがサービングセルと同じPDCCH/PDSCH/UL等の設定を共有する必要がある。
複数の候補セルは、各セルに対応する完全な設定(例えば、ServingCellConfig)が適用され、キャリアアグリゲーション(CA)設定フレームワークを再利用して各サービングセルに関連付けられてもよい。つまり、候補セルは、サービングセルと設定情報を共有せず、別の設定が適用されてもよい。UEは、各候補セルの完全な設定が提供されるので、候補セルと適切な通信を行うことができる。
サービングセル変更指示のための暗黙的な(Implicit)又は明示的な(explicit)シグナリングについて、説明する。
態様1では、サービングセル変更指示のための暗黙的なシグナリングについて、説明する。
特定の制御リソースセット(Control Resource Set(CORESET))(例えば、CORESET#0、CH5 Type0-CSSのCORESET、CH6/CH7/CH8 CSSのCORESETの少なくとも1つ)が、サービングセルのPCIと異なるPCIのセルに関連付けられた1つ以上のTCI状態とともにMAC CEにより指示(アクティブ化)される場合(特定のCORESETに対し、サービングセルのPCIと異なるPCIのセルに関連付けられた1つ以上のTCI状態が、MAC CEによって指示/アクティブ化される場合)に、UEは、サービングセルを他のセル(セルx、異なるPCIを持つセル)に変更すると判断してもよい。つまり、このアクティブ化が、サービングセルを他のセルに変更することを暗黙的に示していてもよい。
MAC CEがPDSCHのTCI状態をアクティブ化/非アクティブ化するとき、MAC CEによってアクティブ化された全ての当該TCI状態が、サービングセルのPCIと異なるPCIを持つ同じセルxに関連付けられている場合に、UEは、サービングセルを他のセル(セルx)に変更すると判断してもよい。つまり、この関連付けが、サービングセルを他のセルへ変更することを暗黙的に示していてもよい。
MAC CEが統一TCI状態(例えばRel.17の統一TCIフレームワークに対応する)をアクティブ化/非アクティブ化し、アクティブ化された全ての統一TCI状態が、異なるPCIを持つ同じセルxに関連付けられている場合に、UEは、サービングセルを他のセル(セルx)に変更すると判断してもよい。つまり、この関連付けが、サービングセルを他のセルへ変更することを暗黙的に示していてもよい。
態様2では、サービングセル変更指示のための明示的な(explicit)シグナリングについて、説明する。態様2は、例えば上述のシナリオ2が適用される。
以下、サービングセル変更指示の例を説明する。なお、非サービングセルのアクティブ化/非アクティブ化、サービングセルの変更、サービングセルの物理セルIDとは異なる物理セルIDを持つ他のセル(非サービングセル)と送信/受信することは互いに読み替えられてもよい。
(2)BWP ID。
(3)アクティベーションに用いる非サービングセルID。非サービングセルIDは、非サービングセルに対応する(非サービングセルを識別可能な)任意の情報に置き換えられてもよい。
(3-1)PCI(直接用いられるPCI)。例えば、10ビットが使用される。
(3-2)非サービングセルの再作成インデックス(新しいID)。新しいIDは、PCIの一部に関連づけられ、UEが利用する(利用可能な)サービングセル及び非サービングセルにのみ設定されてもよい。新しいIDは、PCIよりもビット数を削減することができる。
(3-3)CSI報告設定ID(CSI-ReportConfigId)(CSI-ReportConfigが1つ又は複数の非サービングセルに対応する場合)。
(3-4)CSIリソース設定ID(CSI-ResourceConfigId)(CSI-ResourceConfigIdが1つ又は複数の非サービングセルに対応する場合)。
(3-5)各非サービングセルのアクティブ化/非アクティブ化を示すビットマップ。ビットマップのサイズ(ビット数)は、このCC上で設定された非サービングセルの数と同じであってもよい。例えば、3つの非サービングセルのうち、2番目の非サービングセルをアクティブ化する場合、「010」が設定される。
UEは、既存のMAC CEに新しい1ビットのフィールド「C」を追加したMAC CEを受信してもよい。当該フィールドは、サービングセルの変更を行うかどうかを示す。UEは、当該MAC CEを受信し、当該フィールドに基づいて、サービングセルを他のセルに変更するかを判断してもよい。
オプション2-2におけるMAC CEに対して、さらに、サービングセルインデックス/PCI/その他のID(上述のオプション2-1の新しいIDなど)を示すフィールド、ターゲットセル(変更後のサービングセル)のTCI状態/SSB/CSI-RSのフィールドを、MAC CEに含めてもよい。
図4は、サービングセルスイッチ例1を示す図である。例えば、MCG/SCGのサービングセルSpCell#0において、L1/L2シグナリングにより、候補セル#0-2にサービングセルを変更することが指示された場合、候補セル#0-2が新たなサービングセルSpCell#0となる。また、例えば、MCG/SCGのサービングセルSCell#2において、L1/L2シグナリングにより、候補セル#2-1にサービングセルを変更することが指示された場合、候補セル#2-1が新たなサービングセルSCell#2となる。
RRC/MAC CEは、セルグループ、バンド、FR、UEごとにグローバル候補セルID(cell#0,...,5)を設定することができる。UEは、サービングセルのスイッチを、当該グローバル候補セルIDにより指示されてもよい。
RRC/MAC CEは、セルグループ、バンド、FR、UEごとにグローバル候補セルID(cell#0-1、#0-1,...,2-2)を設定することができる。UEは、サービングセルの切り替えを、当該グローバル候補セルIDにより指示されてもよい。
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。
図10は、L1L2-triggered mobility(LTM)の概要を示す図である。LTM、L1/L2セル間モビリティは、互いに読み替えられてもよい。UEは、UE再構成(UE reconfiguration)の際に、NWから候補セルに関する設定(candidate configurations)を受信する。UE再構成は、TRRC、Tproccesing1/Tproccesing2を含む。TRRC(例えば、最大10ms)は、候補セルの設定(candidate configurations)を運ぶRRC再構成(RRC Reconfiguration)のための処理時間である。Tproccesing1/Tproccesing2(例えば、同じFR用では最大20ms、異なるFR用には最大40ms)は、セル切り替えコマンドの前と後の、それぞれUE処理のための時間である。これには、L2/3再構成、RF再チューニング、ベースバンド再チューニング、必要な場合はセキュリティ更新などが含まれる場合がある。
ネットワーク(例えば、基地局)がPRACH送信を要求するPDCCHオーダーを送信する場合のUE動作の一例について説明する。
UEは、PDCCHオーダーのPDCCHに利用される所定のパラメータに基づいて当該PDCCHオーダー(又は、PDCCHオーダーにより送信を行うPRACH)が対応するセルを判断してもよい。所定のパラメータは、例えば、TCI状態であってもよい。
UEは、PDCCHオーダーに利用されるDCI(又は、CORESET)に基づいて当該PDCCHオーダー(又は、PDCCHオーダーにより送信を行うPRACH)が対応するセルを判断してもよい。
ランダムアクセスのプリアンブルインデックス(例えば、ra-PreambleIndex)が所定値(例えば、0~63)の場合、プリアンブルの一部は、非サービングセルに関連するようにRRC/MAC CEにより設定/アクティブ化されてもよい。
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。
上述のように、将来の無線通信システム(例えば、Rel.16/5Gより後の無線通信システム)では、非サービングセル(例えば候補セル)を含む複数セル間モビリティ、又は複数の送受信ポイント(例えば、マルチTRP)を利用したセル間モビリティに基づいて通信を制御することが想定される。しかし、複数の候補セルに対してUL送信が可能である場合、UL送信の制御(例えば、タイミングアドバンスの制御等)をどのように行うかが問題となる。複数の候補セルに対するUL送信が適切に制御されない場合、複数の送受信ポイントを利用した通信の品質が劣化するおそれがある。
<第1の実施形態>
TAを測定すべきTAGが複数存在する場合、DCIで指示された複数のTAGまたは候補セルに対してPRACHを送信する。本開示では、上述の(PDCCHオーダー)の方法に基づいて、UEは、PDCCH(DCI)により、PRACH送信のための1つまたは複数の候補セルインデックスの指示を受信し、その指示に基づいて、当該候補セルインデックスに対応する1つまたは複数の候補セルに対してPRACHを送信してもよい。また、本実施形態の少なくとも1つでは、PDCCHによりRACHが指示されることにより、RACH手順が開始される。本開示において、候補セルインデックス、TAG IDは、互いに読み替えられてもよい。
態様1-1では、UEが、PRACH送信回数として、PDCCHオーダー、またはMAC CEによって「1回」を指示され、またはRRCによって「1回」を設定され、または仕様によって「1回」を予め定義されているケースについて説明する。
態様1-2では、UEが、PRACH送信回数として、PDCCHオーダー、またはMAC CEによって1より大きい回数を指示され、またはRRCによって1より大きい回数を設定され、または仕様によって1より大きい回数を予め定義されているケースについて説明する。
UEは、FR1において、1つの候補セルのみに対してPRACHを送信する。
UEは、FR2において、DCIの特定のビットに基づいて、1つの候補セルに対してPRACHを送信する。また、1以上の別の候補セルまたは1以上のTAGに対応するPRACH送信が、DCIの別のビット(例えば、追加の1以上のセル/TAG IDを示す新しいビット)により指示されてもよい。
上記別のビットには、予約ビット(Rビット)が利用されてもよい。これにより、DCIフォーマットの総ビット数は変更されない。例えば、RRCによりN個の候補セルまたはTAGが設定された場合、log2N個の予約ビットは、別の候補セルまたはTAGのインデックスに使用される。UEが1つの候補セルに対してのみPRACHを送信する場合、上記別のビットには全て0が設定されてもよい。
上記別のビットのために、DCIに新しいフィールドが追加されてもよい。
FR2において、複数のPRACH送信用候補セルインデックスまたはTAG IDは、上位レイヤシグナリング/物理レイヤシグナリングにより指示/設定されてもよい。セルの設定/指示のためのフィールドは、拡張されてもよい。
オプション2-1、2-2における、DCIフィールドと候補セルインデックスとの対応について、具体例を説明する。DCIのビット数は、RRC/MAC CEにより設定/指示された候補セル/TAGの数に応じて変更されてもよい。本開示において、候補セルインデックス、TAG IDは、互いに読み替えられてもよい。各具体例におけるDCIは、PRACHを指示するPDCCH(PDCCHオーダー)に含まれるDCIであってもよい。
オプション2-1、2-2における、DCIフィールドと候補セルインデックスとの対応について、別の例を説明する。RRCによりN個の候補セルまたはTAGが設定され、DCIのビット数がlog2Nより少ない場合、次の例1~例3のいずれかが適用されてもよい。
候補セルのインデックスまたはTAG IDは、インデックスの小さい順または大きい順に、DCIフィールドに割り当てられる。
UEは、候補セルインデックスまたはTAG IDに対応するパラメータを、上位レイヤシグナリング(例えばMAC CEまたRRC)により受信し、そのパラメータが、DCIフィールドに割り当てられる。
1つまたは複数の候補セルインデックスもしくはTAG ID、またはそれらに対応するパラメータが、予め仕様で定義されるか、または上位レイヤシグナリング(例えばRRCまたはMAC CE)により指示/設定される。そして、DCIにおいて、1つまたは複数の候補セルインデックスもしくはTAG ID、または、それらに対応するパラメータが指示される。
態様1-2のオプション3の具体例として、以下のオプション3-1および3-2の例を説明する。
RRCによりN個の候補セルまたはTAGが設定され、DCIのビット数がlog2Nのとき、1つの候補セルインデックスが予め定義され、別の候補セルインデックスが上位レイヤシグナリング(例えばRRCまたはMAC CE)により指示または設定されてもよい。
各DCIコードポイントに対して、上位レイヤシグナリング(例えばRRCまたはMAC CE)により1つまたは複数の候補セルインデックスが予め設定され、1つのDCIフィールドにおいて、上位レイヤシグナリングの設定に対応するパラメータが指示される。DCIのビットサイズは、上位レイヤシグナリングにより設定されるリストにより決定される。
PRACHの送信回数はPDCCHにより指示されてもよい。DCIのビット数とPRACH送信回数とが対応し、PRACH送信回数がMである場合、log2MビットのDCIフィールドが使用されてもよい。DCIのビット数は、RRC/MAC CEにより設定/指示されたPRACH送信回数に応じて変更されてもよい。PRACH送信回数は、候補セル数と同じであってもよい。つまり、UEは、1つの候補セルに対して1つのPRACHを送信してもよい。UEは、指示されたPRACH送信回数に基づいて、候補セル数を決定してもよい。
PRACH送信数に関するバリエーションについて説明する。UEは、上位レイヤシグナリング(例えばRRCまたはMAC CE)により、M回のPRACH送信が設定/指示され、DCIのビット数がlog2Mビットより少ない場合、次のオプション1または2が適用されてもよい。
PRACH送信回数が小さい順、または大きい順に、DCIフィールドに割り当てられる。
PRACH送信回数は、上位レイヤシグナリング(RRCまたはMAC CE)から設定/指示され、PRACH送信数に対応するパラメータがDCIフィールドに対応づけられる。
候補セルインデックスまたはTAG IDは、MAC CEから指示されるか、またはRRCによって設定されてもよい。候補セルインデックスまたはTAG IDの最大値はXであってもよい。UEは、上位レイヤシグナリング/物理レイヤシグナリングによりXの設定/指示を受信してもよいし、りUE能力情報として送信されてもよい。
TAを測定すべきTAGが複数存在する場合、DCIで指示された複数のTAGまたは候補セルに対するRACHレス方法がトリガされる。RACHレス方法は、ランダムアクセス手順を用いないことを意味し、詳細は後述する。本実施形態では、上述の(PDCCHオーダー)の方法に基づいて、UEは、PRACH送信のための1つの候補セルインデックスまたはタイミングアドバンスグループ(TAG) IDの指示を受信し、当該1つの候補セルに対してPRACHを送信してもよい。以下、「別の候補セルまたはTAG」は、当該1つの候補セルインデックスまたはタイミングアドバンスグループ(TAG) IDとは別のインデックス/IDを有する、候補セル、TAGを意味する。本実施形態のDCIは、上述のPDCCHオーダーに含まれていてもよい。
《オプション1》
UEは、1つの候補セルに対してのみPRACHを送信し、別の候補セルまたはTAGに対してはRACHレス方法はトリガされない。
UEは、1つの候補セルに対してPRACHを送信し、別の候補セルまたはTAGに対するRACHレス方法はトリガされる。この場合、次のオプション2-1~2-3の少なくとも1つが適用される。
1つの候補セルまたはTAGに対するRACHレス方法がトリガされる。別の候補セルまたはTAGは、次のオプション2-1-1~2-1-3のいずれかの方法により指示される。
別の候補セルまたはTAGは、DCIにおける上記1つの候補セルまたはTAG IDビットとは別のビットによって指示される。RRCによりN個の候補セルまたはTAGが設定された場合、log2Nの予約ビット(Rビット)が別の候補セルまたはTAGのインデックスに使用される。RACHレス方法がトリガされない場合は、log2Nの予約ビットには全て0が設定される。これにより、DCIフォーマットの総ビット数は変更されない。
別の候補セルまたはTAGのために、オプション2-1-1とは別のフィールドが追加される。DCIフォーマットの総ビット数は増加する。
第1の実施形態のオプション3の方法により、DCIが別の候補セルまたはTAGを指示する。
UEは、別の候補セル又はTAGの設定を、RRCにより受信する。RRCにおいて設定された候補セル又はTAGのうち、複数の候補セル又はTAGに対するRACHレス方法が、DCI/MAC CEによってトリガされてもよい(DCI/MAC CEによってトリガを受信してもよい)。
UEは、別の候補セル又はTAGの設定を、RRCにより受信する。RRCによって設定された全ての候補セルまたはTAGに対するRACHレス方法が、トリガされてもよい。この場合、次のオプション2-3-1またはオプション2-3-2が適用されてもよい。
UEは、RACHレス方法をトリガするためのフラグを含むDCI/MAC CEを受信する。当該フラグには、予約ビット(R)が使用されてもよい。当該フラグは、例えば、0がトリガなしを意味し、1がトリガありを意味してもよい。
UEは、RACHレス方法をトリガするためのフラグを示す新しいフィールドを含むDCI/MAC CEを受信する。この場合、DCI/MAC CEの総ビット数が増加する。当該フラグは、例えば、0がトリガなしを意味し、1がトリガありを意味してもよい。
RACHレス方法は、TA取得(TA acquisition)のためにNWまたはUEによるランダムアクセス手順のトリガーを行わないメカニズムである。一方、RACHベースの方法(例えば、PDCCHにより指示されるRACH、UEによりトリガされるRACH)は、NWまたはUEによるトリガによって、TA取得のためにランダムアクセス手順が実行されるメカニズムである。RACHレス方法は、RRCまたはMAC CEによりUEに設定/指示されてもよいし、UEによって設定されてもよい。
第1の実施形態では、NWは、PRACH送信数/候補セル数をUEに指示できる。本実施形態では、複数のPRACH送信を指示/設定した場合、UEは各PRACHのリソース/機会(occasion)をどのように決定するかについて説明する。
[UEへの情報の通知]
上述の実施形態における(ネットワーク(Network(NW))(例えば、基地局(Base Station(BS)))から)UEへの任意の情報の通知(言い換えると、UEにおけるBSからの任意の情報の受信)は、物理レイヤシグナリング(例えば、DCI)、上位レイヤシグナリング(例えば、RRCシグナリング、MAC CE)、特定の信号/チャネル(例えば、PDCCH、PDSCH、参照信号)、又はこれらの組み合わせを用いて行われてもよい。
上述の実施形態におけるUEから(NWへ)の任意の情報の通知(言い換えると、UEにおけるBSへの任意の情報の送信/報告)は、物理レイヤシグナリング(例えば、UCI)、上位レイヤシグナリング(例えば、RRCシグナリング、MAC CE)、特定の信号/チャネル(例えば、PUCCH、PUSCH、PRACH、参照信号)、又はこれらの組み合わせを用いて行われてもよい。
上述の実施形態の少なくとも1つは、特定の条件を満たす場合に適用されてもよい。当該特定の条件は、規格において規定されてもよいし、上位レイヤシグナリング/物理レイヤシグナリングを用いてUE/BSに通知されてもよい。
・上記実施形態の少なくとも1つについての特定の処理/動作/制御/情報をサポートすること。
・候補セルインデックス、TAG IDの最大数。
・RACHレス方法をサポートすること。
本開示の一実施形態に関して、以下の発明を付記する。
[付記1]
物理リンク下り制御チャネル(PDCCH)により、物理ランダムアクセスチャネル(PRACH)送信のための1つまたは複数の、候補セルインデックスまたはタイミングアドバンスグループ(TAG) IDの指示を受信する受信部と、
前記指示に基づいて、前記候補セルインデックスまたは前記TAG IDに対応する候補セルに対する、PRACH送信を制御する制御部と、
を有する端末。
[付記2]
前記PDCCHにおける下り制御情報(DCI)における特定のフィールドは、複数の前記候補セルインデックスまたは複数の前記TAG IDを指示する
付記1に記載の端末。
[付記3]
前記受信部は、前記候補セルインデックスまたは前記TAG IDに対応するパラメータを、上位レイヤシグナリングにより受信し、
前記PDCCHにおける下り制御情報(DCI)における特定のフィールドは、前記パラメータを指示する
付記1又は付記2に記載の端末。
[付記4]
前記PDCCHにおける下り制御情報(DCI)における特定のフィールドは、前記PRACH送信の回数を指示する
付記1から付記3のいずれかに記載の端末。
(付記)
本開示の一実施形態に関して、以下の発明を付記する。
[付記1]
物理リンク下り制御チャネル(PDCCH)により、物理ランダムアクセスチャネル(PRACH)送信のための1つの候補セルインデックスまたはタイミングアドバンスグループ(TAG) IDの指示を受信し、1または複数の別の候補セルまたはTAGに対する、ランダムアクセス手順を用いない方法のトリガを受信する受信部と、
前記指示に基づいて、前記候補セルインデックスまたは前記TAG IDに対応する候補セルに対する、PRACH送信を制御する制御部と、
を有する端末。
[付記2]
前記PDCCHにおける下り制御情報(DCI)において、前記1つの別の候補セルまたはTAGは、前記1つの候補セルインデックスまたはTAG IDのビットとは別のビットにおいて指示される
付記1に記載の端末。
[付記3]
前記受信部は、前記別の候補セルまたはTAGの設定を、Radio Resource Control(RRC)により受信し、前記RRCにおいて設定された候補セル又はTAGのうち、複数の候補セル又はTAGに対する前記ランダムアクセス手順を用いない方法のトリガを、下り制御情報(DCI)またはMedium Access Control Control Element(MAC CE)によって受信する
付記1又は付記2に記載の端末。
[付記4]
前記受信部は、前記別の候補セルまたはTAGの設定を、Radio Resource Control(RRC)により受信し、前記RRCによって設定された全ての候補セルまたはTAGに対する、前記ランダムアクセス手順を用いない方法がトリガされる
付記1から付記3のいずれかに記載の端末。
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31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32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)
- 物理リンク下り制御チャネル(PDCCH)により、物理ランダムアクセスチャネル(PRACH)送信のための1つの候補セルインデックスまたはタイミングアドバンスグループ(TAG) IDの指示を受信し、1または複数の別の候補セルまたはTAGに対する、ランダムアクセス手順を用いない方法のトリガを受信する受信部と、
前記指示に基づいて、前記候補セルインデックスまたは前記TAG IDに対応する候補セルに対する、PRACH送信を制御する制御部と、
を有する端末。 - 前記PDCCHにおける下り制御情報(DCI)において、前記1つの別の候補セルまたはTAGは、前記1つの候補セルインデックスまたはTAG IDのビットとは別のビットにおいて指示される
請求項1に記載の端末。 - 前記受信部は、前記別の候補セルまたはTAGの設定を、Radio Resource Control(RRC)により受信し、前記RRCにおいて設定された候補セル又はTAGのうち、複数の候補セル又はTAGに対する前記ランダムアクセス手順を用いない方法のトリガを、下り制御情報(DCI)またはMedium Access Control Control Element(MAC CE)によって受信する
請求項1に記載の端末。 - 前記受信部は、前記別の候補セルまたはTAGの設定を、Radio Resource Control(RRC)により受信し、前記RRCによって設定された全ての候補セルまたはTAGに対する、前記ランダムアクセス手順を用いない方法がトリガされる
請求項1に記載の端末。 - 物理リンク下り制御チャネル(PDCCH)により、物理ランダムアクセスチャネル(PRACH)送信のための1つの候補セルインデックスまたはタイミングアドバンスグループ(TAG) IDの指示を受信し、1または複数の別の候補セルまたはTAGに対する、ランダムアクセス手順を用いない方法のトリガを受信する工程と、
前記指示に基づいて、前記候補セルインデックスまたは前記TAG IDに対応する候補セルに対する、PRACH送信を制御する工程と、
を有する端末の無線通信方法。 - 物理リンク下り制御チャネル(PDCCH)により、物理ランダムアクセスチャネル(PRACH)送信のための1つの候補セルインデックスまたはタイミングアドバンスグループ(TAG) IDの指示を送信し、1または複数の別の候補セルまたはTAGに対する、ランダムアクセス手順を用いない方法のトリガを送信する送信部と、
前記指示に基づいて送信された、前記候補セルインデックスまたは前記TAG IDに対応する候補セルに対する、PRACHの受信を制御する制御部と、
を有する基地局。
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Non-Patent Citations (4)
| Title |
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| MIN ZHU, CATT: "Discussion on timing advance management to reduce latency", 3GPP DRAFT; R1-2211181; TYPE DISCUSSION; NR_MOB_ENH2-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052221746 * |
| See also references of EP4668909A1 * |
| SHINYA KUMAGAI, NTT DOCOMO, INC.: "Timing advance enhancement for inter-cell mobility", 3GPP DRAFT; R1-2212005; TYPE DISCUSSION; NR_MOB_ENH2-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052222569 * |
| SHINYA KUMAGAI, NTT DOCOMO, INC.: "Timing advance enhancement for inter-cell mobility", 3GPP DRAFT; R1-2301515; TYPE DISCUSSION; NR_MOB_ENH2-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Athens, GR; 20230227 - 20230303, 17 February 2023 (2023-02-17), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052248647 * |
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