Terminal and wireless communication method

Abstract

One method of the terminal disclosed in the present invention comprises: a sending unit that sends an uplink shared channel; and a control unit that, when sending the uplink shared channel, determines whether to send a phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) ​​in downlink control information used to schedule the uplink shared channel.

Description

Technical Field

[0001] The present disclosure relates to a terminal and a wireless communication method in a next generation mobile communication system. Background Art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

[0003] Successor systems of LTE (for example, also referred to as fifth generation mobile communication system (5G), 5G+(plus), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] In the existing LTE system (e.g., 3GPP Rel.8-14), the user terminal (UE: User Equipment) controls the reception of the downlink shared channel (e.g., PDSCH: Physical Downlink Shared Channel) based on the downlink control information (also called DCI: Downlink Control Information, DL allocation, etc.) from the base station. In addition, the user terminal controls the transmission of the uplink shared channel (e.g., PUSCH: Physical Uplink Shared Channel) based on the DCI (also called UL grant, etc.).

[0005] Prior art literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), the transmission of a Phase Tracking Reference Signal (PTRS) in UL and DL is being studied. For example, when the UE transmits an uplink shared channel (e.g., PUSCH), the PTRS is controlled based on the settings from the network (e.g., base station).

[0009] In addition, in NR, a random access procedure is supported. In the random access procedure, when the response signal sent for the random access preamble contains an UL transmission indication (e.g., UL grant), the UE transmits PUSCH based on the UL grant. However, how to control the transmission of PTRS in this case has not been fully studied.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately transmitting a Phase Tracking Reference Signal (PTRS).

[0011] Means for solving problems

[0012] A terminal involved in one method of the present disclosure is characterized by comprising: a sending unit that sends an uplink shared channel; and a control unit that, when sending the uplink shared channel, determines whether to send a phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) ​​of downlink control information used to schedule the uplink shared channel.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, a phase tracking reference signal (PTRS) can be appropriately transmitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a diagram showing an example of a contention-based random access procedure.

[0016] Figure 2 This is a diagram showing an example of a non-contention random access procedure.

[0017] Figure 3 This is a diagram showing an example of RAR notified through MAC CE.

[0018] Figure 4A as well as Figure 4B This is a diagram showing an example of PUSCH transmission control according to the first example.

[0019] Figure 5A as well as Figure 5B This is a diagram showing an example of PUSCH transmission control according to the second example.

[0020] Fig. 6A as well as Figure 6B It is a diagram showing another example of PUSCH transmission control involved in the third method.

[0021] Figure 7 This is a diagram showing an example of an MCS table.

[0022] Figure 8 This is a diagram showing an example of a two-step random access procedure.

[0023] Fig. 9 This is a diagram showing another example of a two-step random access procedure.

[0024] Fig.10 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0025] Fig.11 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0026] Fig.12 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0027] Fig.13 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0028] <Random Access Procedure>

[0029] In the existing LTE system (for example, LTE Rel.8-13), a random access procedure for establishing UL synchronization is supported. The random access procedure includes contention-based random access (also known as contention-based random access (CBRA)) and non-contention-based random access (also known as non-CBRA, contention-free random access (CFRA)).

[0030] In contention-based random access (CBRA), a terminal (hereinafter also referred to as a user terminal or UE) sends a preamble randomly selected from a plurality of preambles (also referred to as random access preambles, random access channels (physical random access channels (PRACH)), RACH preambles, etc.) set for each cell. In addition, contention-based random access is a random access procedure led by the UE, and can be used, for example, at the time of initial access, the start or restart of UL transmission, etc.

[0031] On the other hand, in non-contention random access (Non-CBRA, CFRA), the base station allocates the preamble as a UE-specific preamble through the downlink (DL) control channel (PDCCH), and the UE sends the preamble allocated from the base station. Non-contention random access is a random access procedure led by the network, for example, it can be used at the time of handover, when DL transmission starts or restarts (when transmission in the UL of DL retransmission indication information is started or restarted), etc.

[0032] Figure 1 is a diagram showing an example of contention-based random access. Figure 1 In the present invention, the UE receives information (PRACH structure information) indicating the structure (PRACH configuration, RACH configuration) of the random access channel (PRACH) in advance through system information (e.g., MIB (Master Information Block) and / or SIB (System Information Block)) or higher-layer signaling (e.g., RRC (Radio Resource Control) signaling).

[0033] The PRACH structure information can, for example, represent multiple preamble codes set for each cell (for example, preamble code format), time resources used for PRACH transmission (for example, system frame number, subframe number), and frequency resources (for example, the offset (prach-FrequencyOffset) of the starting position of 6 resource blocks (physical resource blocks (PRB: Physical Resource Block))).

[0034] like Figure 1 As shown, when the UE migrates from the idle (RRC_IDLE) state to the RRC connected (RRC_CONNECTED) state (for example, at the time of initial access) or is in the RRC connected state but UL synchronization is not established (for example, when UL transmission is started or restarted), the UE randomly selects one of the multiple preamble codes represented by the PRACH structure information and sends the selected preamble code (message 1) through the PRACH.

[0035] When the base station detects the preamble, it sends a random access response (RAR) (message 2) as a response. After sending the preamble, if the UE fails to receive the RAR within a specific period (RAR window), it increases the transmission power of the PRACH and sends (retransmits) the preamble again. In addition, increasing the transmission power during retransmission is also called power ramping.

[0036] The UE that receives the RAR adjusts the UL transmission timing based on the timing advance (TA) contained in the RAR and establishes UL synchronization. In addition, the UE sends a high-level (L2 / L3: Layer 2 / Layer 3) control message (message 3) through the UL resources specified by the UL grant contained in the RAR. The control message includes the UE identifier (UE-ID). As for the UE identifier, for example, if it is in the RRC connected state, it can also be a C-RNTI (Cell-Radio Network Temporary Identifier), or, if it is in the idle state, it can also be a high-level UE-ID such as S-TMSI (System Architecture Evolution-Temporary Mobile Subscriber Identity).

[0037] The base station sends a conflict resolution message (message 4) according to the control message of the higher layer. The conflict resolution message is sent based on the UE identifier destination included in the above control message. The UE that successfully detects the conflict resolution message sends a positive response (ACK: Acknowledge) in HARQ (Hybrid Automatic Repeat reQuest) to the base station. As a result, the UE in the idle state migrates to the RRC connected state.

[0038] On the other hand, the UE that fails to detect the conflict resolution message determines that a conflict has occurred, reselects a preamble, and repeats the random access process from message 1 to 4. When the base station detects that the conflict has been resolved through an ACK from the UE, the base station sends a UL grant to the UE. The UE uses the UL resources allocated by the UL grant to start UL data.

[0039] Figure 2 1 is a diagram showing an example of non-contention random access. In the case of non-contention random access, first, the base station transmits a physical downlink control channel (PDCCH-order) for indicating the transmission of PRACH to the UE (message 0). The UE transmits a random access preamble (PRACH) at the timing indicated by the PDCCH (message 1). When the random access preamble is detected, the base station transmits a random access response (RAR) as its response information (message 2).

[0040] The UE completes the non-contention random access process by receiving Message 2. As with the contention random access, if the reception of Message 2 fails, the transmission power of the PRACH is increased and Message 1 is transmitted again. When receiving Message 2, the UE may also transmit UL data (e.g., PUSCH) based on the UL transmission indication (UL grant) included in Message 2.

[0041] In the contention-based random access procedure and the non-contention-based random access procedure, the random access response (RAR) may also include information for indicating UL transmission (e.g., UL grant) (see Figure 3 ). Figure 3 An example of MAC control information (MAC RAR) corresponding to RAR is shown. UE transmits an uplink shared channel (PUSCH) based on the timing advance command, UL grant, etc. included in the RAR.

[0042] In the contention-based random access procedure, a PUSCH equivalent to message 3 is transmitted based on the UL grant included in the RAR. In the non-contention-based random access procedure, a PUSCH is transmitted based on the UL grant included in the RAR. The PUSCH may also include power headroom, buffer status report, etc.

[0043] <ptrs>

[0044] In NR, the base station (e.g., gNB) transmits a phase tracking reference signal (PTRS) via the downlink. For example, the base station may also map the PTRS continuously or discontinuously in the time direction on one subcarrier and transmit it. The base station may also transmit the PTRS during at least a portion of the period (time slot, symbol, etc.) during which the downlink shared channel (PDSCH) is transmitted. The PTRS transmitted by the base station may also be referred to as the DL PTRS.

[0045] In addition, the UE transmits a phase tracking reference signal (PTRS) via an uplink. For example, the UE may also map the PTRS continuously or discontinuously in the time direction on one subcarrier and transmit it. The UE may also transmit the PTRS during at least a portion of the period (time slot, code element, etc.) during which the uplink shared channel (Physical Uplink Shared Channel (PUSCH)) is transmitted. The PTRS transmitted by the UE may also be referred to as UL PTRS. Hereinafter, UL PTRS is referred to as PTRS.

[0046] The UE may also determine whether there is PTRS in the uplink (e.g., whether PTRS is transmitted) based on the setting of the higher-layer signaling (e.g., PTRS-UplinkConfig). When the higher-layer signaling related to PTRS (e.g., PTRS-UplinkConfig) is set, the UE may also assume that PTRS exists in the resource block used for PUSCH transmission. The base station may also determine the phase noise based on the PTRS sent from the UE and correct the phase error of the received signal.

[0047] Here, the high-layer signaling may be, for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or any one of them, or a combination thereof.

[0048] MAC signaling may also utilize, for example, MAC control elements (MAC CE (Control Element)), MAC PDU (Protocol Data Unit), etc. Broadcast information may also include, for example, master information blocks (MIB: Master Information Block), system information blocks (SIB: System Information Block), minimum system information (RMSI: Remaining Minimum System Information), other system information (OSI: Other System Information), etc.

[0049] When PTRS is transmitted while PUSCH is transmitted, the UE may also control so that resources to which PTRS are mapped are not used for PUSCH transmission (for example, rate matching).

[0050] In addition, in the existing system (e.g., the current Rel.15), even when the high-level signaling related to PTRS (e.g., PTRS-UplinkConfig) is set, the transmission of PTRS is controlled based on the type or category of the applied RNTI (Radio Network Temporary Identifier). For example, the presence of PTRS in PUSCH is permitted or supported when the RNTI is MCS-C-RNTI, C-RNTI, CS-RNTI, SP-CSI-RNTI.

[0051] However, although RNTI is applied to multiple signals or channels (for example, PDSCH, PUSCH, PDCCH, etc.), the current regulations do not clearly specify to which signal or channel the RNTI is applied.

[0052] For example, in the case of CBRA, the PUSCH scheduled by the UL grant (RAR UL grant) included in the response signal (RAR) corresponding to the random access preamble is scrambled by the TC-RNTI, and in the case of CFRA, it is scrambled by the C-RNTI. Alternatively, in the case of an uplink shared channel scheduled by a downlink control channel (or DCI), the RNTI applied to the downlink control channel is set to be different.

[0053] In this way, when the signal or channel corresponding to the RNTI used to determine whether the PTRS is transmitted is unclear, there is a concern that the PTRS cannot be properly transmitted. For example, it is also assumed that the RNTI applied in the PDCCH for scheduling the PUSCH is different from the RNTI applied in the PUSCH. In this case, how to control the transmission of the PTRS becomes a problem.

[0054] Therefore, as one aspect of the present invention, the inventors of the present invention focused on the fact that the signal or channel corresponding to the RNTI that controls whether or not to send the PTRS is unclear, and thought of making the signal or channel corresponding to the RNTI clear so as to appropriately control whether or not to send the PTRS. Alternatively, the inventors thought of clearly defining whether or not to send the PTRS in the PUSCH scheduled by the RAR UL grant.

[0055] In addition, consider the case where the signal or channel corresponding to the RNTI is downlink control information (or DCI). In this case, the UL grant (RAR UL grant) included in the RAR is notified by MAC, and therefore is not CRC-scrambled by a specific RNTI (e.g., MCS-C-RNTI, C-RNTI, CS-RNTI, SP-CSI-RNTI). Therefore, the PUSCH scheduled by the RAR UL grant basically does not include (does not exist) PTRS.

[0056] On the other hand, when the base station fails to receive (e.g., decode) the PUSCH scheduled by the RAR UL grant, the base station triggers or instructs the retransmission of the PUSCH. For example, in non-contention random access, it is also considered to schedule the retransmission using the DCI scrambled by the CRC using the C-RNTI.

[0057] In this case, if PTRS is configured by higher layer signaling (e.g., PTRS-UplinkConfig), it is assumed that PTRS exists in the retransmission of PUSCH (e.g., UE also transmits PTRS when transmitting PUSCH). If PTRS does not exist in the initial transmission of PUSCH, there is a concern that the size of the transport block cannot be kept the same in the initial transmission of PUSCH and the retransmission of PUSCH.

[0058] As another embodiment of the present invention, the inventors of the present invention studied how to control the transmission (or mapping) of PTRS in at least one of the initial transmission of PUSCH transmitted based on RAR UL grant and the retransmission of the PUSCH, and arrived at one embodiment of the present invention.

[0059] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, the following first to fifth modes can be applied separately, or at least two modes can be combined and applied. In the following description, the presence or absence of PTRS transmission and the presence or absence of PTRS can also be replaced with each other.

[0060] In addition, in the following description, the transmission of PTRS during PUSCH transmission indicated by RAR UL grant in a non-contention type (CFRA) random access process is described as an example, but it is not limited to this. It can also be applied to PTRS during PUSCH transmission indicated by RAR UL grant in a contention type (CBRA) random access process. Alternatively, it can also be applied to PTRS during the initial transmission and retransmission of PUSCH (for example, PUSCH based on the set grant) other than the random access process.

[0061] In this specification, retransmission (or retransmission) may refer to only the first retransmission after the initial transmission, or may refer to multiple retransmissions (multiple retransmissions after the first retransmission).

[0062] (First method)

[0063] In the first method, the case where the RNTI used to determine whether the PTRS is sent is an RNTI applied to a specific signal or channel (or an RNTI used for scrambling a specific signal or channel) is described. In the following description, the case where the specific signal or channel is a downlink shared channel (or DCI) (case 1) and the case where the specific signal or channel is an uplink shared channel (case 2) are described.

[0064] In addition, in the following description, the RNTI applied to the PDCCH may also be the RNTI applied to the CRC scrambling of the PDCCH. In addition, the RNTI applied to the PUSCH may also be the RNTI applied to the scrambling of the PUSCH. In addition, the RNTI applied to the PUSCH may also be used for mapping or sequence generation of RS such as PTRS.

[0065] <Scenario 1>

[0066] It is also possible to configure a structure in which PTRS is transmitted (or mapped) when a PUSCH is scheduled by using a PDCCH (or DCI) that is CRC-scrambled using a specific RNTI. The specific RNTI may be, for example, MCS-C-RNTI, C-RNTI, CS-RNTI, or SP-CSI-RNTI.

[0067] For example, when the PDCCH (or DCI) for scheduling the PUSCH is CRC-scrambled by a specific RNTI, the UE may also assume that the PTRS exists in the resource block used for PUSCH transmission and control the transmission processing (for example, mapping, etc.) (refer to Figure 4A ). The DCI may be a DCI format equivalent to the UL grant (for example, at least one of DCI formats 0_0 and 0_1).

[0068] On the other hand, when the PDCCH (or DCI) scheduling the PUSCH is CRC-scrambled via a PDCCH other than a specific RNTI, the UE may control the transmission process (e.g., mapping, etc.) assuming that there is no PTRS in the resource blocks used for PUSCH transmission.

[0069] For example, even if the RNTI used for scrambling the PUSCH is a specific RNTI, when the DL signal or channel (e.g., PDCCH) that indicates (e.g., schedules) the transmission of the PUSCH is not scrambled by the specific RNTI, the UE may control not to transmit the PTRS. That is, the UE may control not to transmit the PTRS regardless of the RNTI type used in the scrambling of the PUSCH scheduled by the RAR UL grant.

[0070] In this way, by clearly defining the signal or channel corresponding to the RNTI used to determine whether to transmit the PTRS, it is possible to appropriately control the transmission of the PTRS accompanying the PUSCH, and to simplify the UE operation.

[0071] [change]

[0072] Alternatively, a structure may be set such that a signal or channel corresponding to RNTI is not clearly defined and PTRS does not exist in the PUSCH scheduled by RARUL grant (refer to Figure 4B ). Thus, the UE can control not to transmit the PTRS regardless of the RNTI used in the PUSCH (for example, the initial transmission) scheduled by the RAR UL grant. As a result, the UE operation can be simplified.

[0073] <Scenario 2>

[0074] It is also possible to set a structure in which PTRS is transmitted (or mapped) when a PUSCH scrambled by a specific RNTI is transmitted. The specific RNTI may be, for example, MCS-C-RNTI, C-RNTI, CS-RNTI, or SP-CSI-RNTI.

[0075] For example, when the PUSCH is CRC-scrambled using a specific RNTI, the UE may assume that a PTRS exists in a resource block used for PUSCH transmission and control transmission processing (for example, mapping, etc.).

[0076] In this case, the UE can transmit PTRS while sending a PUSCH that is not scheduled through the PDCCH. For example, a PUSCH based on a setting permission is scrambled by the CS-RNTI, but is not scheduled through the PDCCH. In the case of application scenario 2, PTRS can be transmitted while sending a PUSCH based on a setting permission that is not scheduled through the PDCCH (for example, a PUSCH scrambled by the CS-RNTI). Type 1 and Type 2 are specified in the PUSCH based on the setting permission, but it can be applied to either type or both types.

[0077] In addition, in the case of application scenario 2, in non-contention random access (CFRA), the PUSCH scheduled by the RAR UL grant is scheduled by the C-RNTI, so the existence of PTRS can also be permitted or supported in PUSCH transmission. On the other hand, in contention random access (CBRA), the PUSCH scheduled by the RAR UL grant is scheduled by the TC-RNTI, so it can also be set to a structure that does not permit or support the existence of PTRS in PUSCH transmission.

[0078] [change]

[0079] Alternatively, in scenario 2, a configuration may be adopted in which PTRS does not exist in the PUSCH scheduled by the RAR UL grant. That is, control may be performed so that PTRS is not transmitted for the PUSCH scheduled by the RAR UL grant regardless of the applied RNTI type.

[0080] This makes it possible to configure a configuration in which the presence of PTRS is not permitted or supported in PUSCH transmission scheduled by RAR UL grant in both non-contention random access (CFRA) and contention random access (CBRA). As a result, the operations of UE and base station can be common regardless of the type of random access.

[0081] (Second method)

[0082] In the second method, when an uplink shared channel (eg, PUSCH) is transmitted based on a random access response (eg, RAR), control is performed so that the presence or absence of a PTRS in the PUSCH is shared between initial transmission of the PUSCH and retransmission of the PUSCH.

[0083] That is, when PTRS is transmitted (or mapped) to the PUSCH for initial transmission, the UE also transmits PTRS to the PUSCH for retransmission (refer to Figure 5A On the other hand, when the PTRS is not transmitted (or mapped) for the initially transmitted PUSCH, the UE may also control the PTRS not to be transmitted for the retransmitted PUSCH (refer to Figure 5B ).

[0084] For example, the UE may also control the transmission of the PTRS in the PUSCH using at least one of the following options 1-1 to 1-3.

[0085] <Option 1-1>

[0086] The UE performs control so that the PTRS is not transmitted (or mapped) in the initial transmission of the PUSCH and the PTRS is not transmitted in the retransmission of the PUSCH (refer to Figure 5A ). When PTRS is configured through high-layer signaling, the UE may also perform control so as to ignore the configuration of the high-layer signaling and not send PTRS.

[0087] By transmitting the PTRS in the initial transmission and the retransmission of the PUSCH, it is easy to control the transport block size (TBS) of the initial transmission and the retransmission to the same size.

[0088] <Option 1-2>

[0089] The UE performs control so that the PTRS is transmitted (or mapped) in the initial transmission of the PUSCH and the PTRS is transmitted in the retransmission of the PUSCH (refer to Figure 5A ).

[0090] Option 1-2 may also be applied to a case where PTRS is configured by higher layer signaling (eg, UE-specific parameters). Option 1-1 may also be applied to a case where PTRS is not configured by higher layer signaling.

[0091] Alternatively, even when PTRS is not configured by higher layer signaling, Option 1-2 may be applied. In this case, the UE may send PTRS regardless of whether or not higher layer signaling is configured.

[0092] Alternatively, the PTRS corresponding to the initial transmission and the PTRS corresponding to the retransmission may be separately set by different high-layer signaling. In this case, when the PTRS corresponding to the initial transmission is set, option 1-2 may be applied regardless of whether the PTRS corresponding to the retransmission is set (for example, even when the PTRS is not set).

[0093] By sending PTRS in the initial transmission and retransmission of PUSCH, it is easy to control the transmission block size of the initial transmission and retransmission to the same size. In addition, the base station determines the phase noise based on the PTRS sent from the UE in both the initial transmission and the retransmission, and can properly correct the phase error of the received signal.

[0094] <Options 1-3>

[0095] The UE may perform control so as to perform transmission (or mapping) of the PTRS in initial transmission and retransmission of the PUSCH regardless of the presence or absence of the PTRS configuration based on higher layer signaling (UE-specific parameters).

[0096] In this case, as a parameter of the PTRS structure, the UE may also apply a specific value (eg, a default value) to transmit the PTRS. The parameter of the PTRS structure may also be at least one of time density and frequency density.

[0097] For example, when a high-level parameter (timeDensity) related to time density is not notified, or when a field for time density (timeDensity) does not exist, the UE may also apply a specific time density (e.g., L_PT-RS=1). Alternatively, when a high-level parameter (frequencyDensity) related to frequency density is not notified, or when a field for frequency density (frequencyDensity) does not exist, the UE may also apply a predetermined frequency density (e.g., K_PT-RS=2).

[0098] The UE may apply parameters of a predetermined PTRS structure only when the PTRS is not configured through higher-layer signaling, or may apply parameters of a specific PTRS structure even when the PTRS is configured through higher-layer signaling.

[0099] In this way, by controlling the transmission of PTRS in initial transmission and retransmission of PUSCH regardless of the presence or absence of PTRS configuration based on higher layer parameters, it is possible to appropriately control the transmission of PTRS in PUSCH scheduled by RAR UL grant.

[0100] <Changes>

[0101] The UE may determine whether to include the PTRS in the retransmission based on whether the PTRS is included in the initial transmission (or the previous retransmission), regardless of whether the PTRS is configured based on higher layer signaling or the RNTI type.

[0102] (Third Method)

[0103] In the third example, when an uplink shared channel is transmitted based on a random access response, the presence or absence of a PTRS in the PUSCH is controlled separately (for example, differently) in initial transmission of the PUSCH and retransmission of the PUSCH.

[0104] That is, 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 retransmission.

[0105] For example, the UE may also control the transmission of the PTRS in the PUSCH using at least one of the following options 2-1 to 2-4.

[0106] <Option 2-1>

[0107] The UE performs control so as not to transmit (or map) the PTRS in the initial transmission of the PUSCH. The UE may also perform control so as not to transmit the PTRS regardless of whether or not the PTRS is configured by higher layer signaling.

[0108] On the other hand, the transmission of PTRS can also be controlled in the retransmission of PUSCH according to the presence or absence of PTRS configuration based on high-level signaling. For example, when PTRS is configured by high-level signaling, control is performed so that PTRS is transmitted in the retransmission of PUSCH (refer to Fig. 6A ).

[0109] Alternatively, the UE may control to transmit the PTRS in the retransmission of the PUSCH even when the PTRS is not configured by the higher layer signaling. In this case, the UE may ignore the non-configuration of the PTRS by the higher layer signaling and transmit the PTRS.

[0110] In this way, by setting a configuration in which PTRS is not transmitted in the initial transmission of PUSCH but is transmitted in the retransmission of PUSCH, phase noise correction can be appropriately performed using PTRS in the retransmission of PUSCH. This can be expected to reduce the error rate of the retransmission of PUSCH.

[0111] <Option 2-2>

[0112] The UE may control whether or not to transmit the PTRS in the initial transmission of the PUSCH according to whether or not the PTRS is configured by higher layer signaling. For example, the UE may control to transmit the PTRS in the retransmission of the PUSCH when the PTRS is configured by higher layer signaling.

[0113] On the other hand, control may be performed so that the PTRS is not transmitted in the retransmission of the PUSCH regardless of whether the PTRS is set by the higher layer signaling (see Figure 6B ). For example, when PTRS is configured through high-layer signaling, the UE may perform control so as to ignore the configuration of the high-layer signaling and not send PTRS.

[0114] In this way, by setting a structure in which PTRS is transmitted in the initial transmission of PUSCH and PTRS is not transmitted in the retransmission of PUSCH, the error rate of the retransmission PUSCH can be reduced when the coding rate of the data is lowered than that of the initial transmission and then retransmitted. On the other hand, when the coding rate of the data is made the same as that of the initial transmission for retransmission, the resources used for the retransmission of PUSCH can be reduced compared with the initial transmission, and it can be expected that the frequency utilization efficiency of the retransmission of PUSCH can be improved.

[0115] <Option 2-3>

[0116] The UE may control the presence or absence of PTRS transmission in the initial transmission of the PUSCH and the presence or absence of PTRS transmission in the retransmission of the PUSCH, regardless of the presence or absence of PTRS configuration based on higher layer signaling (UE-specific parameters).

[0117] For example, the UE may perform control so as to transmit the PTRS in the initial transmission of the PUSCH and not transmit the PTRS in the retransmission of the PUSCH, regardless of the presence or absence of the PTRS configuration based on the higher layer signaling (UE-specific parameters).

[0118] The parameters of the PTRS structure applied in the PTRS transmission in the initial transmission of the PUSCH may also apply specific values ​​(eg, default values). The parameters of the PTRS structure applied in the PTRS transmission may also apply the methods shown in the above options 1-3.

[0119] <Options 2-4>

[0120] The UE may control the presence or absence of PTRS transmission in the initial transmission of the PUSCH and the presence or absence of PTRS transmission in the retransmission of the PUSCH, regardless of the presence or absence of PTRS configuration based on higher layer signaling (UE-specific parameters).

[0121] For example, the UE may perform control so as 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 the presence or absence of the PTRS configuration based on the higher layer signaling (UE-specific parameters).

[0122] The parameters of the PTRS structure applied in the PTRS transmission in the retransmission of the PUSCH may also apply specific values ​​(eg, default values). The parameters of the PTRS structure applied in the PTRS transmission may also apply the methods shown in the above options 1-3.

[0123] In this way, by controlling the presence or absence of PTRS transmission in the initial transmission and retransmission of PUSCH independently of the presence or absence of PTRS setting based on the high-layer parameters, the phase noise correction effect and error rate reduction effect brought about by inserting PTRS and the data coding rate reduction effect or PUSCH resource reduction effect brought about by not inserting PTRS can be appropriately controlled in the initial transmission and retransmission. As a result, it is possible to more flexibly and appropriately control the improvement of network utilization efficiency and communication quality.

[0124] (Fourth Method)

[0125] In the fourth example, when uplink shared channel transmission is performed based on a random access response, the UE autonomously determines (UE implements) the presence or absence of PTRS in at least one of initial transmission of PUSCH and retransmission of PUSCH.

[0126] For example, the UE may also control the transmission of the PTRS in the PUSCH using at least one of the following options 3-1 to 3-5.

[0127] <Option 3-1>

[0128] The UE performs control so as not to transmit (or map) the PTRS in the initial transmission of the PUSCH. The UE may also perform control so as not to transmit the PTRS regardless of whether or not the PTRS is configured by higher layer signaling.

[0129] On the other hand, the UE may autonomously decide whether to transmit the PTRS during the retransmission of the PUSCH.

[0130] <Option 3-2>

[0131] The UE may control whether to transmit the PTRS in the initial transmission of the PUSCH according to whether the PTRS is configured by the higher layer signaling. For example, when the PTRS is configured by the higher layer signaling, the UE controls to transmit the PTRS in the initial transmission of the PUSCH.

[0132] On the other hand, the UE may autonomously decide (UE implementation) whether to transmit PTRS during PUSCH retransmission.

[0133] <Option 3-3>

[0134] The UE may autonomously decide whether to transmit the PTRS during the initial transmission of the PUSCH.

[0135] On the other hand, the UE performs control so as not to transmit (or map) the PTRS in the retransmission of the PUSCH. The UE may perform control so as not to transmit the PTRS regardless of the presence or absence of the PTRS configuration by the higher layer signaling.

[0136] <Options 3-4>

[0137] The UE may autonomously decide whether to transmit the PTRS during the initial transmission of the PUSCH.

[0138] On the other hand, the UE may control the transmission of PTRS in PUSCH retransmission according to whether PTRS is configured by higher layer signaling. For example, when PTRS is configured by higher layer signaling, control is performed to transmit PTRS in PUSCH retransmission.

[0139] <Options 3-5>

[0140] The UE may autonomously determine whether to transmit the PTRS during initial transmission of the PUSCH and retransmission of the PUSCH.

[0141] In this way, by setting a configuration in which the UE autonomously determines whether to transmit the PTRS, PUSCH transmission based on the RAR UL grant can be appropriately performed even when there is no PTRS setting instruction from the base station.

[0142] (Fifth Method)

[0143] In the fifth embodiment, a transport block size (TBS) applied in the initial transmission and retransmission of PUSCH is described. The fifth embodiment can be preferably applied to a case where the transmission of PTRS is applied only to one of the initial transmission and retransmission (for example, the third embodiment). Of course, the structure applicable to the fifth embodiment is not limited to this.

[0144] In NR, based on a specific field (e.g., modulation and coding scheme (MCS) field) contained in downlink control information (e.g., UL grant), at least one of the modulation scheme (or modulation order) and coding rate of the PUSCH scheduled by the DCI is controlled.

[0145] Specifically, the study investigated the use of a table (MCS table) that associates an MCS index, a modulation order, and a TBS index by the UE to determine the modulation order / coding rate corresponding to the MCS index indicated by the MCS field in the DCI for use with the PUSCH.

[0146] Here, each modulation order is a value corresponding to each modulation method. For example, the modulation orders of QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and 256QAM are 2, 4, 6, and 8, respectively.

[0147] Figure 7 is a diagram showing an example of an MCS table. Figure 7 The values ​​of the MCS table shown are merely examples and are not limited thereto. MCS )Some items associated with it (for example, spectral efficiency) can be omitted or other items can be added.

[0148] Figure 7 An example of a table applied when conversion precoding is enabled and the MCS table information does not indicate 256QAM is shown. In addition, a table applied when conversion precoding is disabled and a table applied when conversion precoding is enabled and the MCS table information indicates 256QAM may be separately defined.

[0149] UE can also use Figure 7 The table determines the MCS index (I MCS ) corresponding to the modulation number / coding rate. For example, Figure 7 In addition, when the UE meets the predetermined conditions (for example, support for BPSK), the modulation order q corresponding to a specific MCS index (for example, 0, 1) may also be 1 (BPSK). When the above-mentioned predetermined conditions are not met, the modulation order q may also be 2 (QPSK).

[0150] In this way, the UE determines the modulation scheme to be applied to the PUSCH (initial transmission or retransmission) based on the MCS index included in the UL grant.

[0151] exist Figure 7 In the table, MCS indexes 28 to 31 correspond to reserved bits. In the fifth method, the reserved bits are used to notify the transport block size (TBS) used in the PUSCH.

[0152] For example, when the MCS field included in the DCI (e.g., UL grant) for indicating the retransmission of the PUSCH indicates a predetermined MCS index, the UE applies the TBS applied in the initial transmission (or the previous retransmission) to the retransmission of the PUSCH. That is, when any one 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.

[0153] Here, it is assumed that the predetermined MCS index is at least one of the MCS indices 28 to 31 corresponding to the reserved bit, but the value of the predetermined MCS index is not limited thereto.

[0154] In this way, by specifying the TBS using bits in a predetermined field included in downlink control information (eg, UL grant) for indicating retransmission, the TBSs of the respective transmissions can be made the same even when only one of the initial transmission and the retransmission of the PUSCH includes the PTRS.

[0155] (change)

[0156] In NR, a random access procedure using fewer steps than the existing 4 steps is studied. As an example, there is a random access procedure using 2 steps. The random access procedure using 2 steps is also called a 2-step random access procedure, 2-step RACH or 2-step RACH. The above-mentioned first method to the fifth method can also be applied to 2-step RACH.

[0157] exist Figure 8 An example of a two-step RACH is shown. The two-step RACH may be composed of a first step in which a UE sends a signal to a base station and a second step in which a base station sends a signal to a UE.

[0158] For example, in the first step, at least one of a UL signal and a UL channel (hereinafter, also referred to as UL signal / UL channel) including a preamble and a message may be sent from the UE to the base station. The preamble may also be a structure that plays the same role as message 1 (PRACH) in the existing random access process. The message may also be a structure that plays the same role as message 3 (PUSCH) in the existing random access process. In addition, the preamble and the message sent in the first step may also be referred to as message A (Msg.A) or the first message.

[0159] In addition, in the second step, at least one of a DL signal and a DL channel (hereinafter, also referred to as a DL signal / DL channel) including a response and contention-resolution may be sent from the base station to the UE. The response may also be a structure that plays the same role as message 2 (random access response (RAR) sent via PDSCH) in the existing random access process. Contention resolution may also be a structure that plays the same role as message 4 (PDSCH) in the existing random access process. In addition, the message sent in the second step may also be referred to as message B (Msg.B) or a second message.

[0160] In the 2-step RACH, for example, it is assumed that the message in the first step (equivalent to the existing message 3) is sent using an uplink shared channel (e.g., PUSCH) (refer to Fig. 9 ). In this case, at least one of the first to fifth methods described above may be applied to the initial transmission and retransmission of the PUSCH included in message A.

[0161] (Wireless Communication System)

[0162] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0163] Fig.10 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), or the like.

[0164] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0165] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0166] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both the MN and the SN are NR base stations (gNB)).

[0167] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the illustrated method. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0168] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0169] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may be equivalent to a frequency band higher than FR2.

[0170] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0171] Multiple base stations 10 can also be connected by wire (for example, optical fiber, X2 interface, etc. in accordance with Common Public Radio Interface (CPRI)) or wireless (for example, NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station can also be called an Integrated Access Backhaul (IAB) host, and the base station 12 equivalent to a relay station (relay) can also be called an IAB node.

[0172] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0173] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0174] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0175] The radio access scheme may also be referred to as a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0176] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0177] In addition, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like can also be used in the wireless communication system 1.

[0178] User data, high-layer control information, system information block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, master information block (MIB) can also be transmitted through PBCH.

[0179] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may also include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0180] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0181] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0182] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0183] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0184] In addition, in the present disclosure, downlink, uplink, etc. may be expressed without adding "link". In addition, various channels may be expressed without adding "Physical" at the beginning.

[0185] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted.

[0186] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS Block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0187] In addition, in the wireless communication system 1, as an uplink reference signal (UL-RS), a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may also be transmitted. In addition, DMRS may also be called a user terminal specific reference signal (UE-specific ReferenceSignal).

[0188] (Base Station)

[0189] Fig.11 1 is a diagram showing an example of a configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission line interface 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission line interface 140 may each be provided with more than one.

[0190] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also possible to assume that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0191] 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 that are described based on common knowledge in the technical field to which the present disclosure relates.

[0192] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission, reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0193] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0194] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0195] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0196] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0197] The transmitting and receiving unit 120 may also form at least one of a transmitting beam and a receiving beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0198] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0199] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0200] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0201] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0202] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0203] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurement, channel state information (CSI) measurement, etc. based on the received signal. The measuring unit 123 may also measure the received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement result may also be output to the control unit 110.

[0204] The transmission path interface 140 may also send and receive signals (backhaul signaling) between devices included in the core network 30 and other base stations 10 , and obtain and transmit user data (user plane data) and control plane data for the user terminal 20 .

[0205] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0206] In addition, the transmitting and receiving unit 120 may also receive an uplink shared channel. The transmitting and receiving unit 120 may also send control information (e.g., PDCCH-order) for instructing the transmission of a random access preamble. In addition, the transmitting and receiving unit 120 may also send a response signal corresponding to the random access preamble. In addition, the transmitting and receiving unit 120 may also send information related to the setting of PTRS (e.g., high-layer signaling).

[0207] When receiving an uplink shared channel, the control unit 110 may also determine the presence or absence of a phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) ​​in the downlink control information used to schedule the uplink shared channel. In addition, when receiving an uplink shared channel, the control unit 110 may also determine the presence or absence of a phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) ​​used for the uplink shared channel.

[0208] The control unit 110 may also assume that the presence or absence of the transmission of the phase tracking reference signal (PTRS) in the initial transmission and the presence or absence of the transmission of the PTRS in the retransmission are set to be common to control the reception. Alternatively, the control unit 110 may also assume that the presence or absence of the transmission of the phase tracking reference signal (PTRS) in the initial transmission and the presence or absence of the transmission of the PTRS in the retransmission are set independently (for example, differently) to control the reception.

[0209] In addition, the control unit 110 may also specify through downlink control information so that the same transport block size is applied in the initial transmission and retransmission of the PUSCH.

[0210] (User Terminal)

[0211] Fig.12 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided in one or more pieces.

[0212] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the user terminal 20 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0213] 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 that are described based on common knowledge in the technical field to which the present disclosure relates.

[0214] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission, reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 220.

[0215] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are explained based on the common knowledge in the technical field involved in the present disclosure.

[0216] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0217] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0218] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0219] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0220] The sending and receiving unit 220 (sending processing unit 2211) may also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 210, to generate a bit string to be sent.

[0221] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0222] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transmitting and receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and when it is not the above-mentioned case, DFT processing is not performed as the above-mentioned transmission processing.

[0223] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0224] On the other hand, the transmitting and receiving unit 220 (RF unit 222) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230.

[0225] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0226] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0227] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0228] In addition, the transmitting and receiving unit 220 may also transmit an uplink shared channel. The transmitting and receiving unit 220 may also receive control information (e.g., PDCCH-order) for instructing the transmission of a random access preamble. In addition, the transmitting and receiving unit 120 may also transmit a random access preamble. In addition, the transmitting and receiving unit 120 may also receive a response signal corresponding to the random access preamble. In addition, the transmitting and receiving unit 120 may also receive information related to the setting of the PTRS (e.g., high-layer signaling).

[0229] When transmitting an uplink shared channel, the control unit 210 may also determine whether to transmit a phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) ​​in the downlink control information used to schedule the uplink shared channel. Alternatively, when transmitting an uplink shared channel, the control unit 210 may also determine whether to transmit a phase tracking reference signal (PTRS) based on the type of RNTI (Radio Network Temporary Identifier) ​​used for the uplink shared channel. In addition, the control unit 210 may also control not to transmit a PTRS when transmitting an uplink shared channel based on a UL transmission indication included in a response signal corresponding to a random access preamble.

[0230] The control unit 210 may also control whether or not a phase tracking reference signal (PTRS) is transmitted in the initial transmission and whether or not a PTRS is transmitted in the retransmission when the uplink shared channel is transmitted based on the response signal. In addition, even when the control unit 210 receives information related to the setting of the PTRS, it may control whether or not the PTRS is transmitted in the initial transmission and the retransmission regardless of the information.

[0231] Alternatively, when the uplink shared channel is transmitted based on the response signal, the control unit 210 may also control whether or not a phase tracking reference signal (PTRS) is transmitted in the initial transmission and whether or not the PTRS is transmitted in the retransmission. In addition, the control unit 210 may also control so that even when information related to the setting of the PTRS is received, the PTRS is transmitted in one of the initial transmission and the retransmission regardless of the information, and the PTRS is not transmitted in the other.

[0232] When the modulation and coding scheme index included in the downlink control information for scheduling the retransmission of the uplink shared channel is a specific value, the control unit 210 may also perform the retransmission using the same transport block size as that for the initial transmission.

[0233] (Hardware Structure)

[0234] In addition, the block diagram used for the description of the above-mentioned embodiment represents a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, using wired, wireless, etc.) connected and implemented using these multiple devices. The functional block can also be implemented by combining software for the above-mentioned one device or the above-mentioned multiple devices.

[0235] Here, the functions include judging, determining, judging, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that performs a sending function may also be referred to as a transmitting unit, a transmitter, etc. As described above, the implementation method is not particularly limited.

[0236] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.13 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0237] In addition, in the present disclosure, the words such as device, circuit, equipment, section, unit, etc. can be used interchangeably. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or can be configured to exclude some of the devices.

[0238] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or using other methods. In addition, the processor 1001 may also be implemented by one or more chips.

[0239] The various functions in the base station 10 and the user terminal 20 are achieved, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations, controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0240] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, etc. For example, at least a portion of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0241] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes according to them. As the program, a program that causes the computer to execute at least a part of the operations described in the above-mentioned embodiments is used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be achieved for other functional blocks.

[0242] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically EPROM (EEPROM), a random access memory (RAM), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0243] The storage 1003 is a computer-readable recording medium, and may be composed of at least one of a flexible disk, a floppy (registered trademark) disk, an optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0244] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also realize the physical or logical separation of the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0245] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0246] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or different buses between the devices.

[0247] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0248] (Variation Example)

[0249] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, or may be referred to as a pilot, a pilot signal, etc., depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0250] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Furthermore, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0251] Here, a parameter set (numerology) may also be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. For example, a parameter set (numerology) may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame structure, specific filtering processing performed by a transmitter and receiver in the frequency domain, and specific windowing processing performed by a transmitter and receiver in the time domain.

[0252] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0253] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be called a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0254] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by other names corresponding to them. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0255] For example, one subframe may be referred to as a TTI, multiple consecutive subframes may be referred to as a TTI, and one time slot or one mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may also be referred to as a time slot, a mini time slot, etc., instead of a subframe.

[0256] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0257] TTI can be a transmission time unit for data packets (transport blocks), code blocks, code words, etc. after channel coding, and can also be a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (for example, the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can also be shorter than the TTI.

[0258] In addition, when one time slot or one mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (the number of mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0259] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0260] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0261] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set (numerology), for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set (numerology).

[0262] In addition, in the time domain, an RB may include one or more symbols, and may be of the length of one slot, one mini slot, one subframe, or one TTI. One TTI, one subframe, etc. may also be composed of one or more resource blocks.

[0263] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0264] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0265] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a numerology in a carrier. Here, common RBs may also be identified by the index of the RB based on the common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0266] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0267] At least one of the set BWPs may also be activated, and the UE may not assume that a specific signal / channel is sent or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0268] In addition, the structures of the radio frame, subframe, time slot, mini-time slot and symbol mentioned above are only examples. For example, the number of subframes included in the radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in the time slot, the number of symbols and RBs included in the time slot or mini-time slot, the number of subcarriers included in the RB, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, etc. can be changed in various ways.

[0269] In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0270] The names used for parameters, etc. in this disclosure are not limiting in any way. Furthermore, the formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, so the various names assigned to these various channels and information elements are not limiting in any way.

[0271] Information, signals, etc. described in this disclosure may also be represented using one of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0272] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0273] The input and output information, signals, etc. can be saved in a specific location (e.g., a memory) or managed using a management table. The input and output information, signals, etc. can be overwritten, updated, or recorded. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0274] The notification of information is not limited to the method / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (downlink control information: Downlink Control Information (DCI)), uplink control information (uplink control information: Uplink Control Information (UCI))), high-level signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast information (Master Information Block (MIB)), System Information Block (System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0275] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection setup (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0276] In addition, notification of specific information (for example, notification of "it is X") is not limited to explicit notification, and may also be performed implicitly (for example, by not notifying the specific information or by notifying other information).

[0277] The determination can be made by a value represented by 1 bit (0 or 1), by a true or false value (Boolean value) represented by true (true) or false (false), or by comparison of numerical values ​​(for example, comparison with a specific value).

[0278] Whether software is referred to as software, firmware, middleware, microcode, hardware description language, or by other names, it shall be interpreted broadly to mean instructions, instruction sets, codes, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, procedures, functions, or the like.

[0279] In addition, software, instructions, information, etc. may also be sent and received via transmission media. For example, when the software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, optical cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0280] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also mean a device (eg, a base station) included in the network.

[0281] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0282] In the present disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP))", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. Base stations are sometimes also referred to as macro cells, small cells, micro-micro cells, and pico cells.

[0283] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0284] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0285] A mobile station is also sometimes called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client or some other appropriate terminology.

[0286] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving car, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) machine such as a sensor.

[0287] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, the user terminal 20 may also be configured to have the functions of the above-mentioned base station 10. In addition, the language such as "uplink" and "downlink" may also be replaced by the language corresponding to the communication between terminals (for example, "side"). For example, the uplink channel, the downlink channel, etc. may also be replaced by the side channel.

[0288] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0289] In the present disclosure, operations performed by a base station may also be performed by its upper node depending on the situation. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by a base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME)), a Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0290] Each method / implementation method described in this disclosure may be used alone, in combination, or switched during execution. In addition, the processing procedures, timings, flow charts, etc. of each method / implementation method described in this disclosure may be swapped in order as long as there is no contradiction. For example, for the method described in this disclosure, various elements of the steps are presented in an illustrative order, and are not limited to the specific order presented.

[0291] The various modes and embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on them. In addition, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G, etc.) may also be applied.

[0292] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise explicitly stated. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0293] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and second element does not mean that only two elements can be used or that the first element must precede the second element in some form.

[0294] The term "determining" as used in this disclosure sometimes includes a variety of operations. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, searching (looking up, searching, inquiry) (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0295] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0296] In addition, "judgment (decision)" can also be regarded as resolving, selecting, choosing, establishing, comparing, etc. "Judgment (decision)". In other words, "judgment (decision)" can also be regarded as certain operations as "judgment (decision)".

[0297] In addition, "judge (decide)" can also be replaced by "assuming (assuming)," "expecting (expecting)", "considering (considering)" and so on.

[0298] The terms "connected", "coupled", or any variation thereof used in this disclosure mean any direct or indirect connection or combination between two or more elements, and may include the situation where one or more intermediate elements exist between the two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may also be physical, logical, or a combination thereof. For example, "connected" may also be replaced by "connected".

[0299] In the present disclosure, in the case of connecting two elements, it is possible to consider using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the wireless frequency domain, microwave domain, light (visible light and invisible light) domain, etc., the two elements are "connected" or "combined" with each other.

[0300] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0301] When the terms "include", "including", and variations thereof are used in the present disclosure, these terms, like the term "comprising", mean inclusive. Furthermore, the term "or" used in the present disclosure does not mean exclusive or.

[0302] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include that the noun following the article is in a plural form.

[0303] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the purpose and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and has no restrictive meaning on the invention involved in the present disclosure.< / ptrs>

Claims

1. A terminal having: A receiving unit, receiving a random access response (RAR) corresponding to the random access preamble; a sending unit, configured to send an uplink shared channel based on an uplink (UL) sending indication included in the RAR; as well as a control unit configured to control not to transmit a phase tracking reference signal (PTRS) in transmission of the uplink shared channel in contention-based random access, and to control not to transmit the PTRS in retransmission of the uplink shared channel when CRC scrambling is performed on the uplink shared channel using the TC-RNTI, The retransmission of the uplink shared channel is the retransmission of control information after receiving the RAR. The control unit controls not to transmit the PTRS in the transmission of the uplink shared channel scheduled by the UL grant (RARUL grant) included in the RAR in the non-contention random access, The control unit supports transmission of the PTRS in retransmission of the uplink shared channel scheduled using the DCI scrambled by the CRC using the C-RNTI in non-contention random access.

2. The terminal according to claim 1, wherein: When the uplink shared channel is transmitted based on the setting grant, the control unit performs control to transmit the PTRS.

3. A wireless communication method, which is a wireless communication method of a terminal, comprising: The step of receiving a random access response (RAR) corresponding to the random access preamble; The step of transmitting an uplink shared channel based on an uplink (UL) transmission indication included in the RAR; and controlling not to transmit a phase tracking reference signal (PTRS) in transmission of the uplink shared channel in contention-based random access, and controlling not to transmit the PTRS in retransmission of the uplink shared channel when CRC scrambling is performed on the uplink shared channel using the TC-RNTI, in, The retransmission of the uplink shared channel is a retransmission of control information after receiving the RAR, In non-contention random access, PTRS is not transmitted in the transmission of the uplink shared channel scheduled by the UL grant (RAR UL grant) included in the RAR. In non-contention random access, transmission of PTRS is supported in retransmission of the uplink shared channel scheduled using DCI scrambled by CRC using C-RNTI.

4. A base station, comprising: a sending unit, sending a random access response (RAR) corresponding to the random access preamble; and a receiving unit, receiving an uplink shared channel transmitted based on an uplink (UL) transmission instruction included in the RAR, The receiving unit does not receive a phase tracking reference signal (PTRS) in transmission of an uplink shared channel and in retransmission of an uplink shared channel when CRC scrambling is performed by TC-RNTI with respect to the uplink shared channel in contention-based random access, The retransmission of the uplink shared channel is the retransmission of control information after the terminal receives the RAR. The receiving unit does not receive the PTRS in receiving the uplink shared channel scheduled by the UL grant (RAR UL grant) included in the RAR in non-contention random access, The receiving unit supports reception of PTRS in retransmission of the uplink shared channel scheduled using DCI scrambled by CRC using C-RNTI in non-contention random access.

5. A system comprising the terminal described in claim 1 and the base station described in claim 4.

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