WO2022208792A1 - 端末、無線通信方法及び基地局 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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Definitions
- the present disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- LTE successor systems for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later
- 5G 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- UE user equipment
- UL data channels eg, Physical Uplink Shared Channel (PUSCH)
- PUSCH Physical Uplink Shared Channel
- UCI Physical Uplink Uplink control information
- NR In NR (5G), it is possible to more flexibly set designs/parameters according to use cases/requirements, and it is also possible to flexibly set channels related to random access (initial access). Even in future wireless communication systems (for example, 6G or later/Rel.17 or later), higher requirements and various use cases are assumed, and more flexible designs are conceivable.
- one of the purposes of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can reduce the payload size for setting initial access.
- a terminal includes, in an initial access procedure, a receiving unit that receives a downlink signal with at least some parameters limited, and an uplink with at least some parameters limited in the initial access procedure. and a control unit that controls transmission of the link signal.
- FIG. 1A and 1B are diagrams illustrating an example of an initial access procedure.
- FIG. 2 is a diagram showing another example of the initial access procedure.
- FIG. 3 is a diagram showing a first example of flexible regions and fixed regions.
- FIG. 4 is a diagram showing a second example of flexible regions and fixed regions.
- FIG. 5 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment.
- FIG. 6 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- FIG. 8 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the random access procedure for establishing uplink (UL) synchronization includes contention-based random access (also called Contention-Based Random Access (CBRA), etc.) and non-collision random access (Non-CBRA, contention-free random access (CFRA), etc.).
- contention-based random access also called Contention-Based Random Access (CBRA), etc.
- non-CBRA non-collision random access
- CFRA contention-free random access
- the UE In contention-based random access (CBRA), the UE is a preamble randomly selected from a plurality of preambles (random access preamble, physical random access channel (PRACH), RACH preamble, etc.) determined for each cell to send.
- Collision-based random access is also a UE-initiated random access procedure, which can be used, for example, at initial access, at the start or restart of UL transmission, and so on.
- Non-collision type random access (Non-CBRA, CFRA)
- the network eg, base station
- the UE sends a preamble assigned by the network.
- Non-collision random access is a network-initiated random access procedure, for example, at handover, when starting or restarting DL transmission (when starting or restarting transmission in UL of retransmission indication information for DL), etc. Can be used. .
- CBRA In NR, as CBRA, Rel. 15 and the four-step CBRA procedure specified in Rel. There is a two-step CBRA procedure specified in Recommendation X.16.
- the former may be called a 4-step RACH, the latter a 2-step RACH, and so on.
- FIG. 1 is a diagram showing an example of an initial access procedure.
- the UE uses at least one of system information (e.g., MIB (Mater Information Block) or SIB (System Information Block)) or higher layer signaling (e.g., RRC (Radio Resource Control) signaling) to use the random access channel (PRACH) information (PRACH configuration information) indicating the configuration of (PRACH configuration, RACH configuration) is received in advance.
- system information e.g., MIB (Mater Information Block) or SIB (System Information Block)
- RRC Radio Resource Control
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and other system information ( It may be Other System Information (OSI).
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- the UE first receives PRACH configuration information and Remaining Minimum System Information (RMSI) by Synchronization Signal Block (SSB).
- the SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be called an SS/PBCH block.
- the PRACH configuration information includes, for example, multiple physical cell IDs (Physical Cell ID (PCI)) defined for each cell, multiple preambles (for example, preamble format) defined for each cell, time resources used for PRACH transmission ( For example, it may include system frame number, subframe number) and frequency resources (for example, offset (prach-frequency offset) indicating the starting position of 6 resource blocks (PRB: Physical Resource Block)).
- PCI Physical Cell ID
- preambles for example, preamble format
- time resources used for PRACH transmission For example, it may include system frame number, subframe number) and frequency resources (for example, offset (prach-frequency offset) indicating the starting position of 6 resource blocks (PRB: Physical Resource Block)).
- PRB Physical Resource Block
- the PBCH may notify the monitoring position of the PDCCH, the PDCCH may notify the RMSI (RMSI PDSCH) resource, and the RMSI may notify the resource used for the PRACH.
- RMSI RMSI PDSCH
- the UE when the UE transitions from the idle (RRC_IDLE) state to the RRC connected (RRC_CONNECTED) state (eg, during initial access), the UE is in the RRC connected state but UL synchronization is not established (eg, , when UL transmission is started or restarted), etc., one of a plurality of preambles indicated by the PRACH configuration information is randomly selected, and the selected preamble is transmitted by PRACH (message 1).
- the base station When the base station detects the preamble, it sends a random access response (RAR) as a response (message 2). If the UE fails to receive the RAR within a predetermined period (RAR window) after transmitting the preamble, it increases the transmission power of the PRACH and retransmits (retransmits or retransmits) the preamble. Note that increasing the transmission power at the time of retransmission is also called power ramping.
- RAR random access response
- the UE that receives the RAR adjusts the UL transmission timing based on the timing advance (TA) included in the RAR and establishes UL synchronization. Also, the UE transmits a control message of higher layers (L2/L3: Layer 2/Layer 3) using the UL resource specified by the UL grant included in the RAR (message 3).
- the control message includes the UE identifier (UE-ID).
- the identifier of the UE may be, for example, C-RNTI (Cell-Radio Network Temporary Identifier) in the RRC connected state, or S-TMSI (System Architecture Evolution-Temporary Mobile Subscriber in the idle state).
- UE-ID of a higher layer such as Identity).
- the base station transmits a collision resolution message according to the upper layer control message (message 4).
- the collision resolution message is transmitted based on the user terminal identifier included in the control message.
- a user terminal that successfully detects a collision resolution message transmits an acknowledgment (ACK: Acknowledge) in HARQ (Hybrid Automatic Repeat reQuest) to the network.
- ACK Acknowledge
- HARQ Hybrid Automatic Repeat reQuest
- a UE that fails to detect the collision resolution message determines that a collision has occurred, reselects the preamble, and repeats the random access procedure of messages 1 to 4.
- the radio base station detects that the collision has been resolved by ACK from the user terminal, it transmits a UL grant to the UE.
- the UE initiates UL data using the UL resources allocated by the UL grant.
- a UE can autonomously start a random access procedure when it wishes to transmit UL data. Also, after UL synchronization is established, UL data is transmitted using UL resources uniquely assigned to user terminals by UL grants, so highly reliable UL transmission is possible. Messages 1 to 4 of the initial access procedure may be called random access procedures.
- NR Rel. 16 considers performing a random access procedure using fewer than the existing four steps.
- An example is a random access procedure using two steps.
- a random access procedure using 2-step is also called a 2-step random access procedure, 2-step RACH, or 2-step RACH.
- a two-step RACH may consist of a first step of transmission from the UE to the network and a second step of transmission from the network to the UE (see Figure 1B).
- a first step at least one of a UL signal and a UL channel containing a preamble and a message may be transmitted from the UE to the network (base station).
- the preamble may be configured to play the same role as message 1 (PRACH) in existing random access procedures.
- the message may be configured to play a role similar to message 3 (PUSCH) in existing random access procedures.
- the preamble and message sent by the first step may be called message A (Msg.A) or the first message.
- a DL signal and a DL channel including response and contention-resolution may be transmitted from the network (base station) to the UE.
- the response may be structured to play a similar role as message 2 (Random Access Response (RAR) sent over PDSCH) in existing random access procedures.
- RAR Random Access Response
- Contention resolution may be configured to play a similar role as message 4 (PDSCH) in existing random access procedures.
- message B Msg.B
- FIG. 2 is a diagram showing another example of the initial access procedure.
- FIG. 2 shows the allocation of each channel/information in time/frequency resources. Since the flow of processing is the same as in FIG. 1A, detailed description is omitted. It is assumed that the upper and lower diagrams in FIG. 2 are connected at (A).
- the example of FIG. 2 shows receiving each signal/channel on one of the four beams. Blank blocks indicate blocks corresponding to other beams.
- the RMSI may be a PDSCH (RMSI PDSCH) that carries the RMSI.
- Message 2 may be a PDSCH carrying message 2 (message 2 PDSCH).
- Message 3 may be a PUSCH carrying message 3 (Message 3 PUSCH).
- Message 4 may be a PDSCH carrying message 4 (Message 4 PDSCH).
- PDSCH carrying RMSI/message 2/message 4 may be scheduled by PDCCH.
- NR In NR (5G), it is possible to more flexibly set designs/parameters according to use cases/requirements, and it is also possible to flexibly set channels related to random access (initial access). Even in future wireless communication systems (for example, 6G or later/Rel.17 or later), higher requirements and various use cases are assumed, and more flexible designs are conceivable.
- the inventors conceived of a terminal that can reduce the payload size related to initial access settings.
- wireless communication method according to each embodiment may be applied independently, or may be applied in combination.
- the following example may be applied in combination with either the above-described four-step random access procedure or two-step random access procedure.
- A/B may be read as “at least one of A and B”.
- PDSCH, RMSI, RMSI PDSCH, message 2, message 2 PDSCH, message 4, message 4 PDSCH may be read interchangeably.
- PUSCH, message 3, message 3 PUSCH may be read interchangeably.
- RACH, PRACH, message 1, random access preamble, and RACH preamble may be read interchangeably.
- fixation, limitation, and definition may be read interchangeably.
- limited may mean limited to a particular value/parameter/range.
- Initial access, initial access procedure, random access, and random access procedure may be read interchangeably.
- defined may mean defined in a specification.
- designs, configurations, settings, parameters, values, and setting ranges may be read interchangeably.
- a flexible area is an area in which design/parameters related to an initial access procedure (eg, random access procedure) can be flexibly set/changed.
- a fixed region is defined as a limited/fixed/defined region of at least some design/parameters for initial access.
- An area in which conditions for setting/changing design/parameters related to initial access are stricter than the flexible area may be called a fixed area.
- the flexible region and the fixed region may each be divided into a region for uplink signals and a region for downlink signals.
- the UE may receive at least some parameter-limited downlink signals and control transmission of at least some parameter-limited uplink signals in the initial access procedure.
- FIG. 3 is a diagram showing a first example of flexible regions and fixed regions.
- the "synchronization channel/signal” of Figure 3 may be the SS/PBCH block (SSB) shown in Figures 1A and 1B.
- “Initial access” in FIG. 3 may refer to each process in FIGS. 1A, 1B, and 2 .
- Data may be PDSCH/PUSCH.
- the “control” may be PDCCH/PUCCH.
- the flexible region and the fixed region exist in different frequency regions.
- the flexible region is set in the high frequency region and the fixed region is set in the low frequency region, but the flexible region may be set in the low frequency region and the fixed region may be set in the high frequency region.
- the flexible area and the fixed area are used together for various communications (initial access, data/control).
- a UE may search for a synchronization signal in any region and perform initial access according to its own capabilities, communication environment, and so on.
- FIG. 4 is a diagram showing a second example of flexible regions and fixed regions. In FIG. 4, description of the same points as in FIG. 3 is omitted.
- a flexible area and a fixed area are assigned functions for each type of communication (initial access, data/control).
- initial access is always in the fixed domain and data/control transmission/reception is always in the flexible domain. It should be noted that initial access may always occur in the flexible region and data/control transmission/reception may always occur in the fixed region.
- 3 and 4 show examples in which the flexible region and the fixed region exist in different frequency domains, but the flexible region and the fixed region exist in different time domains or different spaces (same frequency domain). You may The flexible region and the fixed region may overlap at least partially. For example, a fixed area may be set as part of the flexible area.
- SCS Subcarrier Spacing
- TDD Time Division Duplex
- FR1 frequency range 1
- FR2 frequency range 1
- FR1 frequency range 1
- FR2 frequency range 1
- FR1 frequency range 1
- FR2 frequency range 1
- the frequencies of channel rasters that can be set may be limited.
- the interval between frequencies that can be set by the channel raster may be limited (widened).
- the UE may assume that the reception of SSB/RMSI after RRC connection is sent in the same region as the initial access. Alternatively, the UE may assume that the reception of SSB/RMSI after RRC connection is sent in a different region than the initial access. In this case, transmission conditions such as SSB may be notified/configured to the UE by higher layer signaling.
- the UE may use the same area as the initial access for the random access procedure after RRC connection.
- the UE may perform the random access procedure after the RRC connection using a region different from that for the initial access.
- conditions such as a random access procedure may be notified/configured to the UE by higher layer signaling.
- the SS/PBCH (SSB) transmission period may be limited to a specific period (eg, 20 msec).
- the period of SSB at the time of initial access may be limited to a specific value (eg, defined in specifications), and the transmission period of SSB after RRC connection may be flexibly set by higher layer signaling or the like.
- a synchronization raster (sync raster/synchronization signal (SS) raster), which is a frequency position searched at the time of initial access, may be limited to a specific frequency (frequency range).
- the frequency of configurable synchronization rasters may be limited.
- the frequency range (frequency interval) in which synchronization rasters can be set may be limited (eg, widened).
- the slot SSB configuration (the number of slots for one SSB) may be limited. For example, it may always be 1SSB/1 slot or 1SSB/half slot (1/2 slot).
- the MIB parameter/setting range may be limited.
- the number of bits of the PDCCH configuration information for SIB1 (pdcch-ConfigSIB1) in the MIB may be reduced/omitted to reduce the payload of the PBCH. Bits obtained by reducing/omitting the number of bits of pdcch-ConfigSIB1 may be applied to notification of other information.
- the pdcch-ConfigSIB1 may be subject to the restrictions and information amount reduction described in the following PDCCH configuration restrictions.
- settings/parameters related to PDCCH may be limited compared to existing system PDCCH and PDCCH other than initial access (PDCCH after RRC connection).
- the number of PDCCH RBs (the number of PRBs), the number of symbols, and the offset between PDCCH and SSB may be limited.
- the number of PRBs of PDCCH is the first value (e.g., 48 PRB)
- the number of symbols is the second value (e.g., 2 symbols)
- the offset between PDCCH and SSB is the third value (e.g., 0 or 2) may be limited.
- the information amount of controlResourceSetZero (CORESET) in pdcch-ConfigSIB1 may be reduced (for example, reduced from 4 bits to 1 bit).
- a specification may define a table that indicates these limited settings.
- the parameter (O) corresponding to the first symbol of PDCCH may be limited (eg, 0).
- the number of search space sets per slot may be limited to a certain value (eg, 1).
- the index of the first symbol of PDCCH (First symbol index) may be limited (eg, 0).
- the amount of information in searchSpaceZero in pdcch-ConfigSIB1 may be reduced (eg, reduced from 4 bits to 1 bit).
- a specification may define a table that indicates these limited settings.
- the position/range of PDCCH resources may be uniquely defined.
- the setting contents of pdcch-ConfigSIB1 may be defined uniquely.
- the relative positions (number of slots/number of symbols/number of PRBs) between PDCCH and SSB or PSS/SSS may be defined.
- ⁇ PDSCH> In the initial access procedure, for the frequency / time resource of PDSCH (PDSCH corresponding to (carrying) RMSI / message 2 / message 4) set by DCI, parameters that can be set are other than the existing system PDSCH and initial access PDSCH (PDSCH after RRC connection).
- Frequency Domain Resource Assignment/Allocation may be limited.
- the PDSCH starting position (starting PRB) and the number of PRBs may be limited to specific values.
- a grouping of PRBs may be defined.
- a predetermined number of PRBs for example, 4 PRBs
- resource configuration may be performed on a group-by-group basis.
- DCI Time Domain Resource Assignment/Allocation may be limited.
- a parameter (dmrs-TypeA-Position) indicating the DM-RS position may be limited (eg, 2 or 3).
- the mapping type (PDSCH mapping type) may be limited (for example, Type A).
- a table for the limited PDSCH TDRA (eg, PDSCH time domain resource allocation) may be defined in the specification. This makes it possible to reduce the amount of information in the TDRA field of DCI.
- a new DCI (DCI format) with limited parameters/setting ranges may be defined.
- the new DCI may be a DCI subject to at least one of the PDSCH frequency/time resource limitations described above.
- the new DCI may be a DCI with a reduced payload size compared to DCI format 1_0 (DCI CRS-scrambled by SI-RNTI) that allocates (schedules) the PDSCH.
- the time/frequency resource (location/range of time/frequency resource) of PDSCH may be uniquely defined.
- FDRA/TDRA of DCI may be omitted.
- a new DCI format omitting FDRA/TDRA may be defined. For example, relative positions (number of slots/number of symbols/number of PRBs) between PDSCH and SSB/PDCCH corresponding to RMSI may be defined.
- frequency/time resource restrictions/limitations in DCI may be applied only to DCI corresponding to RMSI (for example, not applied to DCI corresponding to PDSCH in random access).
- frequency/time resource restrictions/limitations in DCI may also apply to DCI corresponding to RMSI and DCI corresponding to PDSCH (message 2/message 4) in random access.
- ⁇ RACH> In the initial access procedure, for frequency/time resources for RACH (PRACH) transmission, configurable parameters may be limited compared to RACH in existing systems and RACH other than initial access (RACH after RRC connection).
- PRACH radio access control
- At least one of the RACH start position (start PRB (msg1-FrequencyStart)) and the number of PRBs may be limited to a specific value.
- RACH grouping (RBG) may be defined. For example, with 4 PRBs as one group, resource setting may be performed on a group-by-group basis.
- n SFN is the number of system frames.
- nSFN mod x y (1)
- a table may be defined that shows the correspondence of each piece of limited information (PRACH configuration index, x, y, number of subframes/number of slots).
- a RACH opportunity may be defined uniquely.
- a parameter (msg1-FrequencyStart) indicating the start position (offset) of the PRACH (message 1) in the frequency domain and the setting contents of the PRACH configuration index (prach-ConfigurationIndex) may be defined uniquely.
- the preamble format may be notified separately.
- the location of the time resource/frequency resource of the RACH opportunity may be uniquely defined. For example, the relative positions (number of slots/number of symbols/number of PRBs) between RACH opportunities and SSB/PDCCH may be defined.
- PUSCH> In the initial access procedure, for the frequency / time resource of PUSCH (message 3 PUSCH) set by DCI, the configurable parameters are compared with PUSCH of the existing system and PUSCH other than initial access (PUSCH after RRC connection) may be limited.
- FDRA may be limited with respect to PUSCH frequency resources. For example, at least one of the PUSCH starting position (starting PRB) and the number of PRBs may be limited to a specific value. Or a grouping of PRBs (RBG) may be defined. For example, with 4 PRBs as one group, resource setting may be performed on a group-by-group basis. These restrictions can reduce the amount of information in the DCI FDRA field.
- the TDRA of DCI may be limited.
- the mapping type (PUSCH mapping type) may be limited (for example, Type A).
- the offset (K2) between DCI and PUSCH scheduled by DCI may be limited (eg, j).
- a table may be defined in the specification for the TDRA of the restricted PUSCH. As a result, the amount of information in RAR (TDRA field of DCI) can be reduced (for example, it can be reduced from 27 bits to 17 bits).
- the time/frequency resource (position/range of time/frequency resource) of PUSCH may be uniquely defined.
- FDRA/TDRA of DCI may be omitted.
- a new DCI format omitting FDRA/TDRA may be defined. For example, relative positions (number of slots/number of symbols/number of PRBs) between PUSCH and SSB/PRACH/RAR may be defined.
- wireless 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 radio communication methods according to the above embodiments of the present disclosure or a combination thereof.
- FIG. 5 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- RATs Radio Access Technologies
- MR-DC is 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 is 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.
- LTE 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 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB) )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB)
- gNB NR base stations
- a wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. You may prepare.
- a user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.
- the base stations 11 and 12 are collectively referred to as the base station 10 when not distinguished.
- the user terminal 20 may connect to at least one of the multiple base stations 10 .
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)).
- Macrocell C1 may be included in FR1, and 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
- a plurality of base stations 10 may be connected by wire (for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is an IAB Also called a node.
- IAB Integrated Access Backhaul
- relay station 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, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication schemes such as LTE, LTE-A, and 5G.
- a radio access scheme 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
- a radio access method may be called a waveform.
- other radio access schemes for example, other single-carrier transmission schemes and other multi-carrier transmission schemes
- the UL and DL radio access schemes may be used as the UL and DL radio access schemes.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (PUSCH) shared by each user terminal 20 an uplink control channel (PUCCH), a random access channel (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, higher layer control information, and the like may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) including scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CControl Resource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource searching for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates.
- a CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with certain search spaces based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- PUCCH channel state information
- acknowledgment information for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- SR scheduling request
- a random access preamble for connection establishment with a cell may be transmitted by the PRACH.
- downlink, uplink, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical" to the head.
- synchronization signals SS
- downlink reference signals DL-RS
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), Positioning Reference Signal (PRS)), Phase Tracking Reference Signal (PTRS)), etc.
- CRS cell-specific reference signal
- CSI-RS channel state information reference signal
- DMRS Demodulation reference signal
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- a signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called SS/PBCH block, SS Block (SSB), and so on.
- SS, SSB, etc. may also be referred to as reference signals.
- DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal).
- FIG. 6 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- the base station 10 comprises a control section 110 , a transmission/reception section 120 , a transmission/reception antenna 130 and a transmission line interface 140 .
- One or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 110 controls the base station 10 as a whole.
- the control unit 110 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (eg, resource allocation, mapping), and the like.
- the control unit 110 may control transmission/reception, measurement, etc. using the transmission/reception unit 120 , the transmission/reception antenna 130 and the transmission line interface 140 .
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer them to the transmission/reception unit 120 .
- the control unit 110 may perform call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.
- the transmitting/receiving section 120 may include a baseband section 121 , a radio frequency (RF) section 122 and a measuring section 123 .
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212 .
- the transmitting/receiving unit 120 is configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure. be able to.
- the transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of the transmission processing section 1211 and the RF section 122 .
- the receiving section may be composed of a reception processing section 1212 , an RF section 122 and a measurement section 123 .
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 120 may receive the above-described uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmission/reception unit 120 (transmission processing unit 1211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) on the bit string to be transmitted. Processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-to-analog conversion may be performed, and the baseband signal may be output.
- channel coding which may include error correction coding
- modulation modulation
- mapping mapping
- filtering filtering
- DFT discrete Fourier transform
- DFT discrete Fourier transform
- the transmitting/receiving unit 120 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 130. .
- the transmitting/receiving unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmission/reception unit 120 (reception processing unit 1212) performs analog-to-digital conversion, Fast Fourier transform (FFT) processing, and Inverse Discrete Fourier transform (IDFT) processing on the acquired baseband signal. )) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing. User data and the like may be acquired.
- FFT Fast Fourier transform
- IDFT Inverse Discrete Fourier transform
- the transmitting/receiving unit 120 may measure the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured.
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- RSSI Received Signal Strength Indicator
- channel information for example, CSI
- the transmission path interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and user data (user plane data) for the user terminal 20, control plane data, and the like. Data and the like may be obtained, transmitted, and the like.
- the transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission line interface 140.
- the transmitting/receiving unit 120 may transmit a downlink signal in which at least some parameters are limited in the initial access procedure.
- the downlink signal includes a synchronization signal block (SSB), a transmission period of the SSB, a synchronization raster of the SSB, a configuration of the SSB, and physical downlink control channel (PDCCH) setting information in a master information block of the SSB. , may be limited.
- the downlink signal may include a physical downlink shared channel (PDSCH), and parameters related to at least one of frequency resources and time resources of the PDSCH may be limited.
- PDSCH physical downlink shared channel
- the control unit 110 may control reception of uplink signals in which at least some parameters are limited in the initial access procedure.
- the uplink signal may include a random access channel (RACH) or a physical uplink shared channel (PUSCH), and the RACH or the PUSCH may be limited in parameters related to at least one of frequency resources and time resources.
- RACH random access channel
- PUSCH physical uplink shared channel
- FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- the user terminal 20 includes a control section 210 , a transmission/reception section 220 and a transmission/reception antenna 230 .
- 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 features of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 210 controls the user terminal 20 as a whole.
- the control unit 210 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission/reception, measurement, etc. using the transmission/reception unit 220 and the transmission/reception antenna 230 .
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission/reception unit 220 .
- the transmitting/receiving section 220 may include a baseband section 221 , an RF section 222 and a measurement section 223 .
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212 .
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure.
- the transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of a transmission processing section 2211 and an RF section 222 .
- the receiving section may include a reception processing section 2212 , an RF section 222 and a measurement section 223 .
- the transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 220 may transmit the above-described uplink channel, uplink reference signal, and the like.
- the transmitter/receiver 220 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing on a bit string to be transmitted. , precoding, digital-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.
- Transmitting/receiving unit 220 transmits the channel using the DFT-s-OFDM waveform when transform precoding is enabled for a certain channel (eg, PUSCH).
- the DFT process may be performed as the transmission process, or otherwise the DFT process may not be performed as the transmission process.
- the transmitting/receiving unit 220 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (error correction) on the acquired baseband signal. decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmitting/receiving section 220 may measure the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measuring unit 223 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like.
- the measurement result may be output to control section 210 .
- the transmitter and receiver of the user terminal 20 in the present disclosure may be configured by at least one of the transmitter/receiver 220 and the transmitter/receiver antenna 230 .
- the transmitting/receiving unit 220 may receive a downlink signal with at least some parameters limited in the initial access procedure.
- the downlink signal includes a synchronization signal block (SSB), a transmission period of the SSB, a synchronization raster of the SSB, a configuration of the SSB, and physical downlink control channel (PDCCH) setting information in a master information block of the SSB. , may be limited.
- the downlink signal may include a physical downlink shared channel (PDSCH), and parameters related to at least one of frequency resources and time resources of the PDSCH may be limited.
- PDSCH physical downlink shared channel
- the control unit 210 may control transmission of uplink signals in which at least some parameters are limited in the initial access procedure.
- the uplink signal may include a random access channel (RACH) or a physical uplink shared channel (PUSCH), and the RACH or the PUSCH may be limited in parameters related to at least one of frequency resources and time resources.
- RACH random access channel
- PUSCH physical uplink shared channel
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- function includes judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deem , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (component) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 8 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
- processor 1001 may be implemented by one or more chips.
- predetermined software program
- the processor 1001 performs calculations, communication via the communication device 1004 and at least one of reading and writing data in the memory 1002 and the storage 1003 .
- the processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- FIG. 10 FIG. 10
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly implemented.
- the memory 1002 is a computer-readable recording medium, such as Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least any other suitable storage medium. may be configured by one.
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also
- 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 a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD), for example. may be configured to include
- the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may also be called a pilot, a pilot signal, etc., depending on the applicable standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may consist of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) that make up a radio frame may be called a subframe.
- a subframe may consist of one or more slots in the time domain.
- a subframe may be of a fixed length of time (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration , a particular filtering process performed by the transceiver in the frequency domain, a particular windowing process performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
- a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
- the short TTI e.g., shortened TTI, etc.
- a TTI having the above TTI length may be read instead.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve.
- the number of subcarriers included in an RB may be determined based on neumerology.
- an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long.
- One TTI, one subframe, etc. may each be configured with one or more resource blocks.
- One or more RBs are Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB Also called a pair.
- PRB Physical Resource Block
- SCG Sub-Carrier Group
- REG Resource Element Group
- PRB pair RB Also called a pair.
- a resource block may be composed of one or more resource elements (Resource Element (RE)).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a bandwidth part) represents a subset of contiguous common resource blocks (RBs) for a numerology on a carrier.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP for UL
- BWP for DL DL BWP
- One or multiple 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, symbols, etc. described above are merely examples.
- the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- information, signals, etc. can 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 and output through multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.
- Uplink Control Information (UCI) Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
- RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of predetermined information is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of
- the determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) , a server, or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.
- a “network” may refer to devices (eg, base stations) included in a network.
- precoding "precoding weight”", “Quasi-Co-Location (QCL)", “Transmission Configuration Indication state (TCI state)", “spatial “spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, “antenna port”, “antenna port group”, “layer”, “number of layers”, Terms such as ⁇ rank'', ⁇ resource'', ⁇ resource set'', ⁇ resource group'', ⁇ beam'', ⁇ beam width'', ⁇ beam angle'', ⁇ antenna'', ⁇ antenna element'', and ⁇ panel'' are interchangeable. can be used as intended.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells.
- the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is assigned to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head (RRH))) may also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)). Head (RRH)
- RRH Head
- the terms "cell” or “sector” refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.
- MS Mobile Station
- UE User Equipment
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- the user terminal 20 may have the functions of the base station 10 described above.
- words such as "uplink” and “downlink” may be replaced with words corresponding to communication between terminals (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be read as sidelink channels.
- user terminals in the present disclosure may be read as base stations.
- the base station 10 may have the functions of the user terminal 20 described above.
- operations that are assumed to be performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Clearly, this can be done by a Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, an integer or a decimal number)
- Future Radio Access FAA
- RAT New - Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi®
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, or other suitable wireless It may be applied to systems using communication methods, next-generation systems extended based on these, and the like. Also, multiple systems may be applied to systems using communication methods, next-generation systems extended based on these, and the like
- determining includes judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry ( For example, looking up in a table, database, or another data structure), ascertaining, etc. may be considered to be “determining.”
- determining (deciding) includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.
- determining is considered to be “determining” resolving, selecting, choosing, establishing, comparing, etc. good too. That is, “determining (determining)” may be regarded as “determining (determining)” some action.
- connection refers to any connection or coupling, direct or indirect, between two or more elements. and can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- radio frequency domain when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
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Abstract
Description
初期アクセス手順において、上りリンク(UL)同期を確立するためのランダムアクセス手順には、衝突型ランダムアクセス(Contention-Based Random Access(CBRA)等ともいう)と非衝突型ランダムアクセス(Non-CBRA、コンテンションフリーランダムアクセス(Contention-Free Random Access(CFRA))等ともいう)とが含まれる。
本開示において、柔軟な領域は、初期アクセス手順(例えば、ランダムアクセス手順)に関するデザイン/パラメータを柔軟に設定/変更可能な領域であるとする。また固定領域は、初期アクセスに関する少なくとも一部のデザイン/パラメータの限定/固定/規定された領域であるとする。なお、初期アクセスに関するデザイン/パラメータを設定/変更する条件が、上記柔軟な領域よりも厳しい領域を固定領域と呼んでもよい。柔軟な領域及び固定領域は、それぞれ、上りリンク信号用の領域と下りリンク信号用の領域とに分かれていてもよい。
初期アクセス手順において、SS/PBCH(SSB)の送信周期が、特定の周期(例えば、20msec)に限定されてもよい。例えば、初期アクセス時のSSBの周期が特定の値に限定(例えば、仕様で定義)され、RRC接続後のSSBの送信周期は上位レイヤシグナリング等により値が柔軟に設定されてもよい。
初期アクセス手順において、PDCCHに関する設定/パラメータが、既存システムのPDCCHや初期アクセス以外のPDCCH(RRC接続後のPDCCH)と比較して限定されてもよい。
初期アクセス手順において、DCIにより設定されるPDSCH(RMSI/メッセージ2/メッセージ4に対応する(これらを運ぶ)PDSCH)の周波数/時間リソースについて、設定可能なパラメータが、既存システムのPDSCHや初期アクセス以外のPDSCH(RRC接続後のPDSCH)と比較して限定されてもよい。
初期アクセス手順において、RACH(PRACH)送信の周波数/時間リソースについて、設定可能なパラメータが、既存システムのRACHや初期アクセス以外のRACH(RRC接続後のRACH)と比較して限定されてもよい。
nSFN mod x=y (1)
また、サブフレーム数/スロット数が限定されてもよい(例えば、サブフレーム数=3、スロット数=7)。これらの限定により、PRACHの設定インデックス(prach-ConfigurationIndex)の情報量を削減(8ビットから4ビットに削減)してもよい。限定された各情報(PRACHの設定インデックス、x、y、サブフレーム数/スロット数)の対応を示すテーブルが規定されてもよい。
初期アクセス手順において、DCIにより設定されるPUSCH(メッセージ3 PUSCH)の周波数/時間リソースについて、設定可能なパラメータが、既存システムのPUSCHや初期アクセス以外のPUSCH(RRC接続後のPUSCH)と比較して限定されてもよい。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図6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7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)
- 初期アクセス手順において、少なくとも一部のパラメータが限定された下りリンク信号を受信する受信部と、
前記初期アクセス手順において、少なくとも一部のパラメータが限定された上りリンク信号の送信を制御する制御部と、
を有する端末。 - 前記下りリンク信号は、同期信号ブロック(SSB)を含み、前記SSBの送信周期、前記SSBの同期ラスタ、前記SSBの構成、前記SSBのマスタ情報ブロック内の物理下りリンク制御チャネル(PDCCH)設定情報、の少なくとも一つが限定される、
請求項1に記載の端末。 - 前記下りリンク信号は、物理下りリンク共有チャネル(PDSCH)を含み、前記PDSCHの周波数リソース及び時間リソースの少なくとも一つに関するパラメータが限定される、
請求項1又は2に記載の端末。 - 前記上りリンク信号は、ランダムアクセスチャネル(RACH)又は物理上りリンク共有チャネル(PUSCH)を含み、前記RACH又は前記PUSCHの、周波数リソース及び時間リソースの少なくとも一つに関するパラメータが限定される、
請求項1から3のいずれかに記載の端末。 - 初期アクセス手順において、少なくとも一部のパラメータが限定された下りリンク信号を受信する工程と、
前記初期アクセス手順において、少なくとも一部のパラメータが限定された上りリンク信号の送信を制御する工程と、
を有する端末の無線通信方法。 - 初期アクセス手順において、少なくとも一部のパラメータが限定された下りリンク信号を送信する送信部と、
前記初期アクセス手順において、少なくとも一部のパラメータが限定された上りリンク信号の受信を制御する制御部と、
を有する基地局。
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