WO2021033224A1 - 端末及び無線通信方法 - Google Patents
端末及び無線通信方法 Download PDFInfo
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- WO2021033224A1 WO2021033224A1 PCT/JP2019/032195 JP2019032195W WO2021033224A1 WO 2021033224 A1 WO2021033224 A1 WO 2021033224A1 JP 2019032195 W JP2019032195 W JP 2019032195W WO 2021033224 A1 WO2021033224 A1 WO 2021033224A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
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- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/0001—Arrangements for dividing the transmission path
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- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
Definitions
- the present disclosure relates to terminals and wireless communication methods 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).
- a successor system to LTE for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP Rel.15 or later, etc.) is also being considered.
- 5G 5th generation mobile communication system
- 5G + plus
- NR New Radio
- 3GPP Rel.15 or later, etc. is also being considered.
- the user terminal In the existing LTE system (for example, 3GPP Rel.8-14), the user terminal (UE: User Equipment) is based on the downlink control information (DCI: Downlink Control Information, DL assignment, etc.) from the base station. , Controls the reception of downlink shared channels (for example, PDSCH: Physical Downlink Shared Channel). Further, the user terminal controls transmission of an uplink shared channel (for example, PUSCH: Physical Uplink Shared Channel) based on DCI (also referred to as UL grant or the like).
- DCI Downlink Control Information
- DL assignment Downlink assignment
- DCI Downlink Control Information
- PDSCH Physical Downlink Shared Channel
- the user terminal controls transmission of an uplink shared channel (for example, PUSCH: Physical Uplink Shared Channel) based on DCI (also referred to as UL grant or the like).
- PTRS Phase Tracking Reference Signal
- PUSCH uplink shared channel
- a network for example, a base station
- NR supports a random access procedure.
- the response signal transmitted to the random access preamble includes a UL transmission instruction (for example, UL grant)
- the UE transmits the PUSCH based on the UL grant.
- a UL transmission instruction for example, UL grant
- one of the purposes of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately transmitting a phase tracking reference signal (PTRS).
- PTRS phase tracking reference signal
- the terminal includes a transmission unit that transmits an uplink shared channel and an RNTI (Radio Network Temporary) that is used for downlink control information that schedules the uplink shared channel when transmitting the uplink shared channel. It is characterized by having a control unit for determining whether or not to transmit a phase tracking reference signal (PTRS) based on the type of Identifier).
- RNTI Radio Network Temporary
- PTRS phase tracking reference signal
- the phase tracking reference signal (PTRS) can be appropriately transmitted.
- FIG. 1 is a diagram showing an example of a collision-type random access procedure.
- FIG. 2 is a diagram showing an example of a non-collision type random access procedure.
- FIG. 3 is a diagram showing an example of RAR notified by MAC CE.
- 4A and 4B are diagrams showing an example of PUSCH transmission control according to the first aspect.
- 5A and 5B are diagrams showing an example of PUSCH transmission control according to the second aspect.
- 6A and 6B are diagrams showing another example of PUSCH transmission control according to the third aspect.
- FIG. 7 is a diagram showing an example of an MCS table.
- FIG. 8 is a diagram showing an example of a two-step random access procedure.
- FIG. 9 is a diagram showing another example of the two-step random access procedure.
- FIG. 8 is a diagram showing an example of a collision-type random access procedure.
- FIG. 2 is a diagram showing an example of a non-collision type random access procedure.
- FIG. 10 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 11 is a diagram showing an example of the configuration of the base station according to the embodiment.
- FIG. 12 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- FIG. 13 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- Random access procedure Existing LTE systems (eg, LTE Rel. 8-13) support random access procedures for establishing UL synchronization. Random access procedures include collision-based random access (also referred to as Contention-Based Random Access (CBRA)) and non-collision-type random access (Non-CBRA, contention-free Random Access (CFRA)). Also called) and is included.
- CBRA Contention-Based Random Access
- CFRA contention-free Random Access
- a terminal In collision-type random access (CBRA), a terminal (hereinafter, also referred to as a user terminal or UE) has a plurality of preambles (random access preamble, random access channel (Physical Random Access Channel (PRACH)), RACH preamble defined in each cell. Etc.) to send a randomly selected preamble.
- the collision type random access is a UE-led random access procedure, and can be used, for example, at the time of initial access, at the time of starting or restarting UL transmission, and the like.
- Non-CBRA, CFRA non-collision type random access
- the base station assigns the preamble to the UE by the downlink (DL) control channel (PDCCH)), and the UE assigns the preamble assigned by the base station.
- DL downlink
- the non-collision type random access is a network-driven random access procedure, and can be used, for example, at the time of handover, at the time of starting or resuming DL transmission (at the time of starting or resuming transmission of DL retransmission instruction information in UL), or the like. ..
- FIG. 1 is a diagram showing an example of collision-type random access.
- the UE uses a random access channel (PRACH) by system information (for example, MIB (Mater Information Block) and / or SIB (System Information Block)) or higher layer signaling (for example, RRC (Radio Resource Control) signaling).
- PRACH random access channel
- MIB Mobile Information Block
- SIB System Information Block
- RRC Radio Resource Control
- PRACH configuration information indicating the configuration (PRACH configuration, RACH configuration) is received in advance.
- the PRACH configuration information includes, for example, a plurality of preambles (for example, preamble format) defined in each cell, time resources (for example, system frame number, subframe number) and frequency resources (for example, 6 resource blocks) used for PRACH transmission.
- PRB Physical Resource Block
- start position offset prach-FrequencyOffset
- the base station When the base station detects the preamble, it sends a random access response (RAR: Random Access Response) as a response (message 2). If the UE fails to receive the RAR within a predetermined period (RAR window) after transmitting the preamble, the transmission power of the PRACH is increased and the preamble is transmitted (retransmitted) again. Increasing the transmission power at the time of retransmission is also called power ramping.
- RAR Random Access Response
- the UE that received the RAR adjusts the transmission timing of the UL based on the timing advance (TA) included in the RAR, and establishes the synchronization of the UL.
- the UE transmits a control message of the upper layer (L2 / L3: Layer 2 / Layer 3) with the UL resource specified by the UL grant included in the RAR (message 3).
- the control message includes a UE identifier (UE-ID).
- the identifier of the UE may be, for example, C-RNTI (Cell-Radio Network Temporary Identifier) in the RRC connection state, or S-TMSI (System Architecture Evolution-Temporary Mobile Subscriber) in the idle state. It may be a UE-ID of a higher layer such as Identity).
- the base station sends a conflict resolution message in response to the control message of the upper layer (message 4).
- the conflict resolution message is transmitted based on the UE identifier included in the control message.
- the UE that succeeds in detecting the conflict resolution message transmits an acknowledgment (ACK: Acknowledge) in HARQ (Hybrid Automatic Repeat reQuest) to the base station.
- ACK Acknowledge
- HARQ Hybrid Automatic Repeat reQuest
- the UE that fails to detect the conflict resolution message determines that a conflict has occurred, reselects the preamble, and repeats the random access procedures of messages 1 to 4.
- the base station detects that the collision has been resolved by ACK from the UE, it transmits a UL grant to the UE.
- the UE starts UL data with the UL resources allocated by the UL Grant.
- FIG. 2 is a diagram showing an example of non-collision type random access.
- the base station first transmits a physical downlink control channel (PDCCH-order) instructing the UE to transmit PRACH (message 0).
- the UE transmits a random access preamble (PRACH) at the timing instructed by the PDCCH (message 1).
- PRACH random access preamble
- RAR random access response
- the UE completes the non-collision type random access process upon receiving the message 2. Similar to the collision type random access, when the reception of the message 2 fails, the transmission power of the PRACH is increased and the message 1 is transmitted again. When the UE receives the message 2, it may transmit UL data (for example, PUSCH) based on the UL transmission instruction (UL grant) included in the message 2.
- UL data for example, PUSCH
- UL grant UL transmission instruction
- the random access response may include information (for example, UL grant) instructing UL transmission (see FIG. 3).
- FIG. 3 shows an example of MAC control information (MAC RAR) corresponding to RAR.
- the UE transmits an uplink shared channel (PUSCH) based on a timing advance command, UL grant, etc. included in RAR.
- PUSCH uplink shared channel
- PUSCH corresponding to message 3 is transmitted based on the UL grant included in RAR.
- PUSCH is transmitted based on the UL grant included in RAR.
- the PUSCH may include power headroom, buffer status reports and the like.
- the base station transmits a phase tracking reference signal (PTRS) on the downlink.
- the base station may transmit the PTRS by mapping them continuously or discontinuously in the time direction, for example, in one subcarrier.
- the base station may transmit the PTRS during at least a portion of the downlink shared channel (PDSCH) transmission period (slots, symbols, etc.).
- PDSCH downlink shared channel
- the PTRS transmitted by the base station may be referred to as DL PTRS.
- the UE transmits a phase tracking reference signal (PTRS) on the uplink.
- PTRS phase tracking reference signal
- the UE may map and transmit the PTRS continuously or discontinuously in the time direction, for example, in one subcarrier.
- the UE may transmit the PTRS at least a part of the period (slot, symbol, etc.) for transmitting the uplink shared channel (PUSCH: Physical Uplink Shared Channel).
- PUSCH Physical Uplink Shared Channel
- the PTRS transmitted by the UE may be called UL PTRS.
- UL PTRS is simply referred to as PTRS.
- the UE may determine whether or not there is PTRS on the uplink (for example, whether or not PTRS is transmitted) based on the setting of the upper layer signaling (for example, PTRS-UplinkConfig).
- the UE may assume that PTRS exists in the resource block used for PUSCH transmission when higher layer signaling related to PTRS (for example, PTRS-UplinkConfig) is set.
- the base station may determine the phase noise based on the PTRS transmitted from the UE and correct the phase error of the received signal.
- the upper layer signaling may be, for example, any one of RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- MAC CE Control Element
- MAC PDU Protocol Data Unit
- the broadcast information includes, for example, a master information block (MIB: Master Information Block), a system information block (SIB: System Information Block), a minimum system information (RMSI: Remaining Minimum System Information), and other system information (OSI: Other). System Information) may be used.
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI Other system information
- the UE may control (for example, rate matching) so that the resource to which the PTRS is mapped is not applied to the PUSCH transmission.
- RNTI Radio Network Temporary Identifier
- RNTI is applied to a plurality of signals or channels (for example, PDSCH, PUSCH, PDCCH, etc.), the current regulations do not clearly specify which signal or channel the RTNI is applied to. ..
- a PUSCH scheduled by a UL grant (RAR UL grant) included in a response signal (RAR) corresponding to a random access preamble is scrambled by TC-RNTI in the case of CBRA and scrambled by C-RNTI in the case of CFRA. Will be done.
- the uplink shared channel is scheduled by the downlink control channel (or DCI)
- the RNTI applied to the downlink control channel is set differently.
- PTRS may not be transmitted properly.
- the RNTI applied to the PDCCH that schedules the PUSCH and the RNTI applied to the PUSCH are different, and in such a case, how to control the transmission of the PTRS becomes a problem.
- the present inventors pay attention to the fact that the signal or channel corresponding to the RNTI that controls the presence or absence of transmission of the PTRS is not clear, and clarify the signal or channel corresponding to the RNTI.
- the idea was to properly transmit or not transmit PTRS.
- the idea was to clearly specify whether or not PTRS is transmitted in PUSCH scheduled by RAR UL Grant.
- the signal or channel corresponding to RNTI is downlink control information (or DCI).
- the UL grant included in the RAR (RAR UL grant) is notified by MAC, so that a specific RNTI (for example, MCS-C-RNTI, C-RNTI, CS-RNTI, SP-CSI-RNTI) Is not CRC scrambled. Therefore, the PUSCH scheduled at the RAR UL grant basically does not include (does not exist) PTRS.
- the base station if the base station fails in the PUSCH reception process (for example, decoding) scheduled by the RAR UL grant, the base station triggers or instructs the PUSCH to be retransmitted. For example, in non-collision type random access, it is conceivable to schedule retransmission using CRC scrambled DCI with C-RNTI.
- PTRS is set by higher layer signaling (for example, PTRS-UplinkConfig)
- PTRS-UplinkConfig higher layer signaling
- the UE also transmits PTRS when transmitting PUSCH.
- the size of the transport block may not be kept the same in the PUSCH of the initial transmission and the PUSCH of the retransmission.
- the present inventors as another aspect of the present invention, how to transmit (or map) the PTRS in at least one of the initial transmission of the PUSCH to be transmitted based on the RAR UL ground and the retransmission of the PUSCH. We examined whether to control it, and came to one aspect of the present invention.
- first to fifth aspects may be used alone, or at least two may be applied in combination.
- the presence / absence of PTRS transmission and the presence / absence of PTRS may be read as each other.
- the presence / absence of PTRS transmission at the time of PUSCH transmission instructed to be transmitted by the RAR UL grant in the non-collision type (CFRA) random access procedure is given as an example, but the present invention is not limited to this. It may be applied to the PTRS at the time of PUSCH transmission in which transmission is instructed by the RAR UL grant in the collision type (CBRA) random access procedure. Alternatively, it may be applied to PTRS at the time of initial transmission and retransmission of a PUSCH (for example, a set grant-based PUSCH) other than the random access procedure.
- a PUSCH for example, a set grant-based PUSCH
- retransmission may refer only to the first transmission to be retransmitted after the first transmission, or to multiple retransmissions (multiple retransmissions of the first retransmission transition). May be good.
- the RNTI for determining the presence / absence of transmission of the PTRS is an RNTI applied to a specific signal or channel (or an RNTI used for scrambling a specific signal or channel) will be described.
- a case where the specific signal or channel is a downlink shared channel (or DCI) (case 1) and a case where the specific signal or channel is an uplink shared channel (case 2) will be described.
- the RNTI applied to the PDCCH may be the RNTI applied to the CRC scrambling of the PDCCH.
- the RNTI applied to the PUSCH may be an RNTI applied to the scrambling of the PUSCH.
- RNTI applied to PUSCH may be used for mapping RS such as PTRS and generating a series.
- ⁇ Case 1> When transmitting the PUSCH scheduled by the CRC scrambled PDCCH (or DCI) in a specific RNTI, the PTRS may be transmitted (or mapped).
- the specific RNTI may be, for example, MCS-C-RNTI, C-RNTI, CS-RNTI, SP-CSI-RNTI.
- the UE assumes that PTRS exists in the resource block used for the PUSCH transmission and performs transmission processing (for example, mapping). It may be controlled (see FIG. 4A).
- the DCI may be in the DCI format corresponding to the UL grant (eg, at least one of the DCI formats 0_0 and 0_1).
- the UE assumes that the resource block used for the PUSCH transmission does not have the PTRS and performs transmission processing (for example,). Mapping etc.) may be controlled.
- the DL signal or channel for example, PDCCH
- the PTRS may be controlled not to be transmitted. That is, the UE may control not to transmit the PTRS regardless of the RNTI type applied to the PUSCH scramble scheduled in the RAR UL grant.
- PTRS may be absent in the PUSCH scheduled in the RAR UL grant without explicitly defining the corresponding signal or channel for RNTI (see FIG. 4B).
- the UE can control not to transmit the PTRS regardless of the RNTI used for the PUSCH (for example, the first transmission) scheduled in the RAR UL grant.
- UE operation can be simplified.
- the PTRS When transmitting the PUSCH scrambled by a specific RNTI, the PTRS may be transmitted (or mapped).
- the specific RNTI may be, for example, MCS-C-RNTI, C-RNTI, CS-RNTI, SP-CSI-RNTI.
- the UE may control the transmission process (for example, mapping) assuming that the PTRS exists in the resource block used for the PUSCH transmission.
- the UE can transmit the PTRS when transmitting the PUSCH that is not scheduled by the PDCCH.
- a configuration grant-based PUSCH is scrambled on CS-RNTI but not scheduled on PDCCH.
- Case 2 it is possible to transmit PTRS when transmitting a setting grant-based PUSCH (for example, a PUSCH scrambled by CS-RNTI) that is not scheduled by PDCCH.
- type 1 and type 2 are specified in the setting grant-based PUSCH, it may be applied to one type or both types.
- Case 2 when Case 2 is applied, in the non-collision type random access (CFRA), the PUSCH scheduled by the RAR UL grant is scheduled by the C-RNTI, so that the existence of the PTRS may be allowed or supported in the PUSCH transmission. Good.
- CBRA collision type random access
- the PUSCH scheduled by the RAR UL grant is scheduled by the TC-RNTI, the presence of the PTRS may not be allowed or supported in the PUSCH transmission.
- PTRS may not be present in the PUSCH scheduled by the RAR UL grant. That is, for PUSCH scheduled by RAR UL grant, it may be controlled not to transmit PTRS regardless of the applied RNTI type.
- CFRA non-collision random access
- CBRA collision random access
- the presence or absence of PTRS in the PUSCH is determined by the initial transmission of the PUSCH and the retransmission of the PUSCH. It is controlled so that it is common to.
- an uplink shared channel for example, PUSCH
- a random access response for example, RAR
- the UE when the UE transmits (or maps) the PTRS to the PUSCH of the initial transmission, it also transmits the PTRS to the PUSCH of the re-transmission (see FIG. 5A). On the other hand, when the UE does not transmit (or map) the PTRS to the PUSCH of the initial transmission, the UE may control not to transmit the PTRS to the PUSCH of the retransmission (see FIG. 5B).
- the UE may control the transmission of PTRS in PUSCH by using at least one of the following options 1-1 to 1-3.
- the UE controls not to transmit (or map) the PTRS in the initial transmission of the PUSCH and not to transmit the PTRS in the retransmission of the PUSCH (see FIG. 5A).
- the UE may control not to transmit the PTRS by ignoring the setting of the upper layer signaling.
- the UE controls to transmit (or map) the PTRS in the initial transmission of the PUSCH and transmit the PTRS in the retransmission of the PUSCH (see FIG. 5A).
- Option 1-2 may be applied when PTRS is set by higher layer signaling (for example, UE-specific parameters). If PTRS is not set by higher layer signaling, option 1-1 may be applied.
- higher layer signaling for example, UE-specific parameters
- option 1-2 may be applied even when PTRS is not set by upper layer signaling.
- the UE may transmit the PTRS regardless of whether or not the upper layer signaling is set.
- the PTRS corresponding to the initial transmission and the PTRS corresponding to the retransmission may be set by separate upper layer signaling.
- option 1-2 may be applied regardless of whether or not the PTRS corresponding to the retransmission is set (for example, even if the PTRS is not set). ..
- the base station can determine the phase noise based on the PTRS transmitted from the UE in both the initial transmission and the retransmission, and can appropriately correct the phase error of the received signal.
- the UE may control to transmit (or map) the PTRS in the initial transmission and retransmission of the PUSCH regardless of whether or not the PTRS is set by the upper layer signaling (UE-specific parameter).
- the UE may transmit a PTRS by applying a predetermined value (for example, a default value) as a parameter of the PTRS configuration.
- the parameter of the PTRS configuration may be at least one of time density (time Density) and frequency density (frequency Density).
- the UE may apply the parameters of the predetermined PTRS configuration only when the PTRS is not set by the upper layer signaling, or may apply the parameters of the predetermined PTRS configuration even when the PTRS is set by the upper layer signaling. May be applied.
- the UE determines whether to include PTRS in retransmission based on whether PTRS is set by upper layer signaling and whether PTRS is included in the initial transmission (or the previous retransmission) regardless of the RNTI type. You may.
- the presence or absence of PTRS in the PUSCH is determined separately for the initial transmission of the PUSCH and the retransmission of the PUSCH (for example, differently). )Control.
- the UE independently controls the transmission (or mapping) of the PTRS in the PUSCH transmission of the initial transmission and the transmission of the PTRS in the PUSCH transmission of the re-transmission.
- the UE may control the transmission of PTRS in PUSCH by using at least one of the following options 2-1 to 2-4.
- the UE controls not to transmit (or map) the PTRS in the initial transmission of the PUSCH.
- the UE may control the transmission of the PTRS by higher layer signaling regardless of whether the PTRS is set or not.
- the presence / absence of PTRS transmission may be controlled based on the presence / absence of PTRS setting by higher layer signaling. For example, when PTRS is set by higher layer signaling, control is performed so that PTRS is transmitted in the retransmission of PUSCH (see FIG. 6A).
- the UE may control to transmit the PTRS in the retransmission of the PUSCH even when the PTRS is not set by the upper layer signaling.
- the UE may transmit the PTRS by ignoring the non-setting of the PTRS by the upper layer signaling.
- the phase noise correction can be appropriately performed by using the PTRS in the retransmission PUSCH. This can be expected to reduce the error rate of the retransmission PUSCH.
- the UE may control whether or not PTRS is transmitted based on whether or not PTRS is set by higher layer signaling in the initial transmission of PUSCH. For example, when PTRS is set by higher layer signaling, it is controlled to transmit PTRS in the retransmission of PUSCH.
- the UE may control not to transmit the PTRS regardless of whether or not the upper layer signaling is set.
- the data coding rate is reduced from that of the initial transmission and the retransmission of the PUSCH is performed.
- the error rate can be reduced.
- the resource used by the retransmission PUSCH can be made smaller than that of the initial transmission, and the frequency utilization efficiency of the retransmission PUSCH can be expected to be improved.
- the UE may separately control whether or not the PTRS is transmitted in the initial transmission of the PUSCH and whether or not the PTRS is transmitted in the retransmission of the PUSCH, regardless of whether or not the PTRS is set by the upper layer signaling (UE-specific parameter).
- the UE may control to transmit the PTRS in the initial transmission of the PUSCH and not to transmit the PTRS in the retransmission of the PUSCH regardless of whether or not the PTRS is set by the upper layer signaling (UE-specific parameter).
- the upper layer signaling UE-specific parameter
- a predetermined value (for example, a default value) may be applied to the parameter of the PTRS configuration applied to the transmission of the PTRS in the initial transmission of the PUSCH.
- the parameters of the PTRS configuration applied to the PTRS transmission the method shown in option 1-3 above may be applied.
- the UE may separately control whether or not the PTRS is transmitted in the initial transmission of the PUSCH and whether or not the PTRS is transmitted in the retransmission of the PUSCH, regardless of whether or not the PTRS is set by the upper layer signaling (UE-specific parameter).
- the UE may control not to transmit the PTRS in the initial transmission of the PUSCH but to transmit the PTRS in the retransmission of the PUSCH regardless of whether or not the PTRS is set by the upper layer signaling (UE-specific parameter).
- the upper layer signaling UE-specific parameter
- a predetermined value (for example, a default value) may be applied to the parameter of the PTRS configuration applied to the transmission of the PTRS in the retransmission of the PUSCH.
- the parameters of the PTRS configuration applied to the PTRS transmission the method shown in option 1-3 above may be applied.
- the phase noise correction effect and the error rate reduction by inserting the PTRS can be appropriately controlled in each of the initial transmission and the retransmission. As a result, it is possible to more flexibly and appropriately control the improvement of network utilization efficiency and the improvement of communication quality.
- the UE when transmitting the uplink shared channel based on the random access response, the UE autonomously determines the presence or absence of the PTRS in at least one of the initial transmission of the PUSCH and the retransmission of the PUSCH (UE implementation). ).
- the UE may control the transmission of PTRS in PUSCH by using at least one of the following options 3-1 to 3-5.
- the UE controls not to transmit (or map) the PTRS in the initial transmission of the PUSCH.
- the UE may control the transmission of the PTRS by higher layer signaling regardless of whether the PTRS is set or not.
- the UE may autonomously determine whether or not to transmit the PTRS in the retransmission of the PUSCH.
- the UE may control whether or not PTRS is transmitted based on whether or not PTRS is set by higher layer signaling in the initial transmission of PUSCH. For example, when PTRS is set by higher layer signaling, control is performed so that PTRS is transmitted at the first transmission of PUSCH.
- the UE may autonomously determine whether or not to transmit the PTRS in the retransmission of the PUSCH (UE implementation).
- the UE may autonomously determine whether or not the PTRS is transmitted in the initial transmission of the PUSCH.
- the UE controls so that the PTRS transmission (or mapping) is not performed in the PUSCH retransmission.
- the UE may control the transmission of the PTRS by higher layer signaling regardless of whether the PTRS is set or not.
- the UE may autonomously determine whether or not the PTRS is transmitted in the initial transmission of the PUSCH.
- the UE may control the presence / absence of PTRS transmission based on the presence / absence of PTRS setting by higher layer signaling in the PUSCH retransmission. For example, when PTRS is set by higher layer signaling, it is controlled to transmit PTRS in the retransmission of PUSCH.
- the UE may autonomously determine whether or not to transmit the PTRS in the initial transmission of the PUSCH and the retransmission of the PUSCH.
- the transport block size (TBS) applied in the initial transmission and retransmission of PUSCH will be described.
- the fifth aspect is suitably applicable when the transmission of the PTRS is applied to only one of the initial transmission and the retransmission (for example, the third aspect).
- the configuration to which the fifth aspect is applicable is not limited to this.
- a PUSCH modulation method for example, a modulation and coding scheme
- a predetermined field for example, a modulation and coding scheme (MCS) field
- MCS modulation and coding scheme
- the UE uses a table (MCS table) that associates the MCS index, the modulation order (Modulation order), and the TBS index, and uses the modulation order / code corresponding to the MCS index indicated by the MCS field in the DCI. It is being considered to determine the conversion rate for PUSCH.
- MCS table a table that associates the MCS index, the modulation order (Modulation order), and the TBS index. It is being considered to determine the conversion rate for PUSCH.
- each modulation order is a value corresponding to each modulation method.
- the modulation orders of QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and 256QAM are 2, 4, 6, and 8, respectively.
- FIG. 7 is a diagram showing an example of an MCS table.
- the values in the MCS table shown in FIG. 7 are merely examples, and are not limited thereto. Also, some items (eg, spectral efficiency) associated with the MCS index ( IMCS ) may be omitted or other items may be added.
- FIG. 7 shows an example of a table to be applied when transform precoding is enabled and the above MCS table information does not indicate 256QAM.
- a table applied when transform precoding is disabled and a table applied when transform precoding is enabled and the MCS table information indicates 256QAM may be defined separately. ..
- the UE may use the table of FIG. 7 to determine the modulation order / code rate corresponding to the MCS index (IMCS) in the DCI. For example, in FIG. 7, if the UE still satisfies certain conditions (eg, BPSK support), the modulation order q corresponding to the particular MCS index (eg 0, 1) is 1 (BPSK). May be good. If the above specific condition is not satisfied, the modulation order q may be 2 (QPSK).
- certain conditions eg, BPSK support
- the modulation order q corresponding to the particular MCS index eg 0, 1
- the modulation order q may be 2 (QPSK).
- the UE determines the modulation method to be applied to PUSCH (initial transmission or retransmission) based on the MCS index included in the UL grant.
- the MCS index 28-31 corresponds to the reserved bit.
- the reserved bit is used to notify the transport block size (TBS) applied to the PUSCH.
- Apply TBS That is, when any of the MCS indexes 28-31 is specified by the MCS field, the UE controls so that the TBS of the initial transmission and the retransmission are the same.
- the predetermined MCS index is at least one of the MCS indexes 28-31 corresponding to the reserved bits), but the value of the predetermined MCS index is not limited to this.
- PTRS is included in only one of the initial transmission and retransmission of PUSCH. Even so, the TBS of each transmission can be the same.
- the NR is considering performing a random access procedure using fewer steps than the existing four steps.
- Random access procedures using two steps are also referred to as two-step random access procedures, two-step RACH, or 2-step RACH.
- the first-fifth aspect may be applied in a two-step RACH.
- the two-step RACH may be composed of a first step of transmitting from the UE to the base station and a second step of transmitting from the base station to the UE.
- the preamble may be configured to play a role similar to Message 1 (PRACH) in an existing random access procedure.
- the message may be configured to play a role similar to Message 3 (PUSCH) in the existing random access procedure.
- the preamble and the message transmitted in the first step may be referred to as message A (Msg.A) or the first message.
- the second step at least one of the DL signal and the DL channel (hereinafter, also referred to as DL signal / DL channel) including the response and the contention-resolution is transmitted from the base station to the UE.
- the response may be configured to play a role similar to message 2 (random access response (RAR) transmitted by PDSCH) in the existing random access procedure.
- RAR random access response
- the conflict resolution may be configured to play a role similar to Message 4 (PDSCH) in an existing random access procedure.
- the message transmitted in the second step may be referred to as a message B (Msg.B) or a second message.
- the message (corresponding to the existing message 3) in the first step is transmitted using the uplink shared channel (for example, PUSCH) (see FIG. 9).
- the uplink shared channel for example, PUSCH
- at least one of the first aspect to the fifth aspect may be applied to the initial transmission and retransmission of the PUSCH included in the message A.
- wireless communication system Wireless communication system
- communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.
- FIG. 10 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..
- the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technology (RAT) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E).
- -UTRA Dual Connectivity (NE-DC) may be included.
- the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the NR base station (gNB) is MN
- the LTE (E-UTRA) base station (eNB) is SN.
- the wireless communication system 1 has dual connectivity between a plurality of base stations in 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.
- a plurality of base stations in the same RAT for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )
- NR-NR Dual Connectivity NR-DC
- gNB NR base stations
- the wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. You may prepare.
- the user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.
- the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.
- the user terminal 20 may be connected to at least one of the plurality of base stations 10.
- the user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).
- CA Carrier Aggregation
- DC dual connectivity
- CC Component Carrier
- 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)).
- the macro cell C1 may be included in FR1 and the small cell C2 may be included in FR2.
- FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 24 GHz (above-24 GHz).
- the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.
- the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between 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 a relay station (relay) is IAB. It may be called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal that supports at least one of 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
- DL Downlink
- UL Uplink
- 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 wireless access method may be called a waveform.
- another wireless access system for example, another single carrier transmission system, another multi-carrier transmission system
- the UL and DL wireless access systems may be used as the UL and DL wireless access systems.
- downlink shared channels Physical Downlink Shared Channel (PDSCH)
- broadcast channels Physical Broadcast Channel (PBCH)
- downlink control channels Physical Downlink Control
- Channel PDCCH
- the uplink shared channel Physical Uplink Shared Channel (PUSCH)
- the uplink control channel Physical Uplink Control Channel (PUCCH)
- the random access channel shared by each user terminal 20 are used.
- Physical Random Access Channel (PRACH) Physical Random Access Channel or the like may be used.
- PDSCH User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH.
- User data, upper layer control information, and the like may be transmitted by the PUSCH.
- MIB Master Information Block
- PBCH Master Information Block
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of 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.
- the PDSCH may be read as DL data
- the PUSCH may be read as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used for detecting PDCCH.
- CORESET corresponds to a resource that searches for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates).
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space 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.
- the "search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. of the present disclosure may be read as each other.
- channel state information (Channel State Information (CSI)
- delivery confirmation information for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.
- scheduling request (Scheduling Request ( Uplink Control Information (UCI) including at least one of SR))
- the PRACH may transmit a random access preamble to establish a connection with the cell.
- downlinks, uplinks, etc. may be expressed without “links”. Further, it may be expressed without adding "Physical" at the beginning of various channels.
- a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation).
- CRS Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- DeModulation Demodulation reference signal
- Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like.
- SS, SSB and the like 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
- UE-specific Reference Signal UE-specific Reference Signal
- FIG. 11 is a diagram showing an example of the configuration of the base station according to the embodiment.
- the base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140.
- the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.
- the functional blocks of the feature portion in the present embodiment are mainly shown, 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 part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like.
- the control unit 110 may control transmission / reception, measurement, and the like 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, and the like, and transfer the data to the transmission / reception unit 120.
- the control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.
- the transmission / reception 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 transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on common recognition in the technical fields 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 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 receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.
- the transmitting / receiving antenna 130 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 120 processes, for example, the Packet Data Convergence Protocol (PDCP) layer and the Radio Link Control (RLC) layer for data, control information, etc. acquired from the control unit 110 (for example,).
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 120 performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted.
- the base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog transform, and other transmission processing.
- IFFT inverse fast Fourier transform
- the transmission / reception unit 120 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..
- the transmission / reception unit 120 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.
- the transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmission / reception unit 120 may perform measurement on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal.
- the measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)).
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- Signal strength for example, Received Signal Strength Indicator (RSSI)
- propagation path information for example, CSI
- the measurement result may be output to the control unit 110.
- the transmission line interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, and the like, and provides user data (user plane data) and control plane for the user terminal 20. Data or the like may be acquired or transmitted.
- the transmitter and receiver of the base station 10 in the present disclosure may be composed of at least one of the transmitter / receiver 120, the transmitter / receiver antenna 130, and the transmission line interface 140.
- the transmission / reception unit 120 may receive the uplink shared channel.
- the transmission / reception unit 120 may transmit control information (for example, PDCCH-order) instructing the transmission of the random access preamble. Further, the transmission / reception unit 120 may transmit a response signal corresponding to the random access preamble. Further, the transmission / reception unit 120 may transmit information regarding the PTRS setting (for example, upper layer signaling).
- the control unit 110 determines the presence or absence of the phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) used for the downlink control information for scheduling the uplink shared channel. You may judge. Further, when receiving the uplink shared channel, the control unit 110 may determine whether or not there is a phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) used for the uplink shared channel. Good.
- RNTI Radio Network Temporary Identifier
- the control unit 110 may control reception on the assumption that the presence / absence of transmission of the phase tracking reference signal (PTRS) in the initial transmission and the presence / absence of transmission of PTRS in retransmission are set in common. Alternatively, the control unit 110 controls reception on the assumption that the presence / absence of transmission of the phase tracking reference signal (PTRS) in the initial transmission and the presence / absence of transmission of PTRS in retransmission are set independently (for example, differently). May be good.
- PTRS phase tracking reference signal
- control unit 110 may specify in the downlink control information so that the same transport block size is applied to the initial transmission and the retransmission of the PUSCH.
- FIG. 12 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- the user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230.
- the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.
- this example mainly shows the functional blocks of the feature portion in 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 part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be composed of a controller, a control circuit, and the like described based on the 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, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230.
- the control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.
- the transmission / reception unit 220 may include a baseband unit 221 and 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 transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the 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 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 receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.
- the transmitting / receiving antenna 230 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , 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, control information, etc. acquired from the control unit 210.
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output the baseband signal.
- Whether or not to apply the DFT process may be based on the transform precoding setting.
- the transmission / reception unit 220 transmission processing unit 2211 described above for transmitting a channel (for example, PUSCH) using the DFT-s-OFDM waveform when the transform precoding is enabled.
- the DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.
- the transmission / reception unit 220 may perform modulation, filtering, amplification, etc. to the radio frequency band on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..
- the transmission / reception unit 220 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.
- the transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmission / reception unit 220 may perform measurement on the received signal.
- the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal.
- the measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like.
- the measurement result may be output to the control unit 210.
- the transmitter and receiver of the user terminal 20 in the present disclosure may be composed of at least one of the transmitter / receiver 220 and the transmitter / receiver antenna 230.
- the transmission / reception unit 220 may transmit an uplink shared channel.
- the transmission / reception unit 220 may receive control information (for example, PDCCH-order) instructing the transmission of the random access preamble.
- the transmission / reception unit 120 may transmit a random access preamble.
- the transmission / reception unit 120 may receive a response signal corresponding to the random access preamble.
- the transmission / reception unit 120 may receive information regarding the setting of the PTRS (for example, higher layer signaling).
- the control unit 210 When transmitting an uplink shared channel, the control unit 210 transmits or does not transmit a phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) used for downlink control information that schedules the uplink shared channel. May be determined. Alternatively, when transmitting the uplink shared channel, the control unit 210 determines whether or not to transmit the phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) used for the uplink shared channel. May be good. Further, the control unit 210 may control not to transmit the PTRS when transmitting the uplink shared channel based on the UL transmission instruction included in the response signal corresponding to the random access preamble.
- RNTI Radio Network Temporary Identifier
- the control unit 210 controls so that the presence / absence of transmission of the phase tracking reference signal (PTRS) in the initial transmission and the presence / absence of transmission of PTRS in retransmission are common. May be good. Further, even when the control unit 210 receives the information regarding the PTRS setting, the control unit 210 may control whether or not the PTRS is transmitted in the initial transmission and the retransmission regardless of the information.
- PTRS phase tracking reference signal
- the control unit 210 may separately control whether or not the phase tracking reference signal (PTRS) is transmitted in the initial transmission and whether or not the PTRS is transmitted in the retransmission. Good. Further, even when the control unit 210 receives the information regarding the PTRS setting, the control unit 210 does not transmit the PTRS in one of the initial transmission and the retransmission and does not transmit the PTRS in the other regardless of the information. You may control it.
- PTRS phase tracking reference signal
- the control unit 210 applies the same transport block size as the initial transmission to perform retransmission. You may.
- each functional block is realized by using one physically or logically connected device, or directly or indirectly (for example, two or more physically or logically separated devices). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (constituent unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the method of realizing each of them is not particularly limited.
- the base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 13 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- the base station 10 and the 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 the devices shown in the figure, or may be configured not to include some of the devices.
- processor 1001 may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors.
- the processor 1001 may be mounted by one or more chips.
- the processor 1001 For each function of the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
- predetermined software program
- the processor 1001 operates, for example, an operating system to control 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 unit, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission / reception unit 120 220
- the like may be realized by the processor 1001.
- the processor 1001 reads a program (program code), a software module, 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.
- a program program code
- the control unit 110 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.
- the memory 1002 is a computer-readable recording medium, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EPROM), a Random Access Memory (RAM), or any other suitable storage medium. It may be composed of one.
- the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, and is, for example, a flexible disc, a floppy (registered trademark) disc, an optical magnetic disc (for example, a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disc, etc.). At least one of Blu-ray® disks, removable disks, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. May be configured by.
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). It may be configured to include.
- the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an 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.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
- the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the wireless frame may be composed of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe.
- the subframe may be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
- the numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration.
- SCS subcarrier Spacing
- TTI Transmission Time Interval
- a specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
- the slot may be composed of one or more symbols in the time domain (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.).
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may be a time unit based on numerology.
- the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be called a sub slot. A minislot may consist of a smaller number of symbols than the slot.
- a PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as a PDSCH (PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.
- the wireless frame, subframe, slot, mini slot and symbol all represent the time unit when transmitting a signal.
- the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
- the time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.
- one subframe may be called TTI
- a plurality of consecutive subframes may be called TTI
- one slot or one minislot may be called 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. It may be.
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
- the definition of TTI is not limited to this.
- the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (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 referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
- TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
- the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- One or more RBs are 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, and an RB. It may be called a pair or the like.
- Physical RB Physical RB (PRB)
- SCG sub-carrier Group
- REG resource element group
- the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)).
- RE Resource Element
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth Part (which may also be called partial bandwidth) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good.
- the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be set in one carrier for the UE.
- At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini slots, and symbols are merely examples.
- the number of subframes contained in a wireless frame the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB.
- the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, radio resources may be indicated by a given index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may be voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers.
- Information, signals, etc. may be input / output via a plurality of network nodes.
- the input / output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.
- the notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method.
- the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (master information block (MIB), system information block (SIB), etc.), medium access control (MAC) signaling), other signals or combinations thereof May be carried out by.
- 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 referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like.
- the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.
- MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).
- CE MAC Control Element
- the notification of predetermined information is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).
- the determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).
- Software is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name.
- Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted to mean.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- a transmission medium For example, a website where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- Network may mean a device (eg, a base station) included in the network.
- precoding "precoding weight”
- QCL Quality of Co-Co-Location
- TCI state Transmission Configuration Indication state
- space "Spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, "antenna port”, “antenna port group”, “layer”, “number of layers”
- Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, "antenna”, “antenna element", “panel” are compatible.
- base station BS
- wireless base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission point (Transmission Point (TP))
- Reception point Reception Point
- TRP Transmission / Reception Point
- Panel , "Cell”, “sector”, “cell group”, “carrier”, “component carrier” and the like
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (for example, three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)).
- Communication services can also be provided by Head (RRH))).
- RRH Head
- the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.
- MS mobile station
- UE user equipment
- terminal terminal
- 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. , Handset, user agent, mobile client, 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 the mobile body, the mobile body itself, or the like.
- the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- 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
- the base station in the present disclosure may be read by the user terminal.
- communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the user terminal 20 may have the function of the base station 10 described above.
- words such as "up” and “down” may be read as words corresponding to inter-terminal communication (for example, "side").
- the uplink, downlink, and the like may be read as side channels.
- the user terminal in the present disclosure may be read as a base station.
- the base station 10 may have the functions of the user terminal 20 described above.
- the operation performed by the base station may be performed by its upper node (upper node) in some cases.
- various operations performed for communication with a terminal are performed by the base station and one or more network nodes other than the base station (for example,).
- Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.
- each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution.
- the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction.
- the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- Future Radio Access FAA
- New-Radio Access Technology RAT
- NR New Radio
- NX New radio access
- Future generation radio access FX
- GSM Global System for Mobile communications
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi (registered trademark)
- IEEE 802.16 WiMAX (registered trademark)
- a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).
- references to elements using designations such as “first”, “second”, etc. as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.
- determining used in this disclosure may include a wide variety of actions.
- judgment (decision) means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment”.
- judgment (decision) means receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access (for example). It may be regarded as “judgment (decision)" of "accessing” (for example, accessing data in memory).
- judgment (decision) is regarded as “judgment (decision)” such as solving, selecting, selecting, establishing, and comparing. May be good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of some action.
- connection are any direct or indirect connection or connection between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are “connected” or “joined” to each other.
- the connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- the radio frequency domain microwaves. It can be considered to be “connected” or “coupled” to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, and the like.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
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Abstract
Description
既存のLTEシステム(例えば、LTE Rel.8-13)では、UL同期を確立するためのランダムアクセス手順がサポートされている。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。
NRにおいて、基地局(例えば、gNB)は、下りリンクで位相追従参照信号(PTRS:Phase Tracking Reference Signal)を送信する。基地局は、PTRSを、例えば1サブキャリアにおいて時間方向に連続又は非連続にマッピングして送信してもよい。基地局は、PTRSを、下り共有チャネル(PDSCH)を送信する期間(スロット、シンボルなど)の少なくとも一部において送信してもよい。基地局が送信するPTRSは、DL PTRSと呼ばれてもよい。
第1の態様では、PTRSの送信有無を判断するRNTIが特定の信号又はチャネルに適用されるRNTI(又は、特定の信号又はチャネルのスクランブルに利用されるRNTI)である場合について説明する。以下の説明では、特定の信号又はチャネルが下り共有チャネル(又は、DCI)である場合(ケース1)と、特定の信号又はチャネルが上り共有チャネルである場合(ケース2)について説明する。
特定のRNTIでCRCスクランブルされたPDCCH(又は、DCI)でスケジュールされたPUSCHを送信する場合、PTRSが送信(又は、マッピング)される構成としてもよい。特定のRNTIは、例えば、MCS-C-RNTI、C-RNTI、CS-RNTI、SP-CSI-RNTIであってもよい。
あるいは、RNTIが対応する信号又はチャネルを明確に定義せずに、RAR ULグラントでスケジュールされるPUSCHにPTRSが存在しない構成としてもよい(図4B参照)。これにより、UEは、RAR ULグラントでスケジュールされるPUSCH(例えば、初回送信)に利用するRNTIに関わらずPTRSを送信しないように制御することができる。その結果、UE動作を簡略化することができる。
特定のRNTIでスクランブルされたPUSCHを送信する場合、PTRSが送信(又は、マッピング)される構成としてもよい。特定のRNTIは、例えば、MCS-C-RNTI、C-RNTI、CS-RNTI、SP-CSI-RNTIであってもよい。
あるいは、ケース2において、RAR ULグラントでスケジュールされるPUSCHにPTRSが存在しない構成としてもよい。つまり、RAR ULグラントでスケジュールされるPUSCHについては、適用されるRNTIタイプに関わらずPTRSを送信しないように制御してもよい。
第2の態様では、ランダムアクセスレスポンス(例えば、RAR)に基づいて上り共有チャネル(例えば、PUSCH)の送信を行う場合に、当該PUSCHにおけるPTRSの存在有無を、PUSCHの初回送信とPUSCHの再送信に対して共通となるように制御する。
UEは、PUSCHの初回送信においてPTRSの送信(又は、マッピング)を行わず、PUSCHの再送信においてPTRSの送信を行わないように制御する(図5A参照)。上位レイヤシグナリングによりPTRSが設定されている場合、UEは、当該上位レイヤシグナリングの設定を無視してPTRSの送信を行わないように制御してもよい。
UEは、PUSCHの初回送信においてPTRSの送信(又は、マッピング)を行い、PUSCHの再送信においてPTRSの送信を行うように制御する(図5A参照)。
UEは、上位レイヤシグナリング(UE固有パラメータ)によるPTRSの設定有無に関わらず、PUSCHの初回送信及び再送信においてPTRSの送信(又は、マッピング)を行うように制御してもよい。
UEは、上位レイヤシグナリングによるPTRSの設定有無、RNTIタイプに関わらず、初回送信(又は、一つ前の再送)にPTRSが含まれるかに基づいて、再送にPTRSを含めるか否かを決定してもよい。
第3の態様では、ランダムアクセスレスポンスに基づいて上り共有チャネルの送信を行う場合に、当該PUSCHにおけるPTRSの存在有無を、PUSCHの初回送信とPUSCHの再送信に対して別々に(例えば、異なって)制御する。
UEは、PUSCHの初回送信においてPTRSの送信(又は、マッピング)を行わないように制御する。UEは、上位レイヤシグナリングによりPTRSが設定有無に関わらず、PTRSの送信を行わないように制御してもよい。
UEは、PUSCHの初回送信において上位レイヤシグナリングによるPTRSの設定有無に基づいてPTRSの送信有無を制御してもよい。例えば、上位レイヤシグナリングによりPTRSが設定されている場合、PUSCHの再送信においてPTRSの送信を行うように制御する。
UEは、上位レイヤシグナリング(UE固有パラメータ)によるPTRSの設定有無に関わらず、PUSCHの初回送信におけるPTRSの送信有無と、PUSCHの再送信におけるPTRSの送信有無をそれぞれ別々に制御してもよい。
UEは、上位レイヤシグナリング(UE固有パラメータ)によるPTRSの設定有無に関わらず、PUSCHの初回送信におけるPTRSの送信有無と、PUSCHの再送信におけるPTRSの送信有無をそれぞれ別々に制御してもよい。
第4の態様では、ランダムアクセスレスポンスに基づいて上り共有チャネルの送信を行う場合に、PUSCHの初回送信及びPUSCHの再送信の少なくとも一方におけるPTRSの存在有無をUEが自律的に決定する(UE implementation)。
UEは、PUSCHの初回送信においてPTRSの送信(又は、マッピング)を行わないように制御する。UEは、上位レイヤシグナリングによりPTRSが設定有無に関わらず、PTRSの送信を行わないように制御してもよい。
UEは、PUSCHの初回送信において上位レイヤシグナリングによるPTRSの設定有無に基づいてPTRSの送信有無を制御してもよい。例えば、上位レイヤシグナリングによりPTRSが設定されている場合、PUSCHの初回送信においてPTRSの送信を行うように制御する。
UEは、PUSCHの初回送信においてPTRSの送信有無を自律的に決定してもよい。
UEは、PUSCHの初回送信においてPTRSの送信有無を自律的に決定してもよい。
UEは、PUSCHの初回送信及びPUSCHの再送信においてPTRSの送信有無を自律的に決定してもよい。
第5の態様では、PUSCHの初回送信と再送信で適用するトランスポートブロックサイズ(TBS)について説明する。第5の態様は、PTRSの送信が初回送信と再送信のうち一方のみに適用される場合(例えば、第3の態様)に好適に適用できる。もちろん、第5の態様が適用可能な構成はこれに限られない。
NRでは、既存の4ステップより少ないステップを利用してランダムアクセス手順を行うことが検討されている。一例として、2ステップを利用したランダムアクセス手順がある。2ステップを利用したランダムアクセス手順は、2ステップランダムアクセス手順、2ステップRACH、又は2-step RACHとも呼ばれる。上記第1の態様-第5の態様は、2ステップRACHにおいて適用してもよい。
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11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12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 (5)
- 上り共有チャネルを送信する送信部と、
前記上り共有チャネルの送信を行う場合に、前記上り共有チャネルをスケジュールする下り制御情報に利用されるRNTI(Radio Network Temporary Identifier)のタイプに基づいて位相追従参照信号(PTRS)の送信有無を決定する制御部と、を有することを特徴とする端末。 - 上り共有チャネルを送信する送信部と、
前記上り共有チャネルの送信を行う場合に、前記上り共有チャネルに利用されるRNTI(Radio Network Temporary Identifier)のタイプに基づいて位相追従参照信号(PTRS)の送信有無を決定する制御部と、を有することを特徴とする端末。 - 前記制御部は、ランダムアクセスプリアンブルに対応する応答信号に含まれるUL送信指示に基づいて上り共有チャネルを送信する場合に、前記PTRSの送信は行わないように制御することを特徴とする請求項1又は請求項2に記載の端末。
- 上り共有チャネルを送信する工程と、
前記上り共有チャネルの送信を行う場合に、前記上り共有チャネルをスケジュールする下り制御情報に利用されるRNTI(Radio Network Temporary Identifier)のタイプに基づいて位相追従参照信号(PTRS)の送信有無を決定する工程と、を有することを特徴とする無線通信方法。 - 上り共有チャネルを送信する工程と、
前記上り共有チャネルの送信を行う場合に、前記上り共有チャネルに利用されるRNTI(Radio Network Temporary Identifier)のタイプに基づいて位相追従参照信号(PTRS)の送信有無を決定する工程と、を有することを特徴とする無線通信方法。
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