Terminal, wireless communication method, and base station

Abstract

A terminal according to an aspect of the present disclosure includes: a reception unit that, in an initial access procedure, does not receive at least one of a broadcast channel (PBCH), a physical downlink control channel (PDCCH), and a physical downlink shared channel (RMSI PDSCH) that carries system information, and receives other channels or signals; and a control unit that performs control in the initial access procedure based on the other channels or signals. According to an aspect of the present disclosure, the payload size related to the setting of the initial access can be reduced.

Description

Technical Field

[0001] This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems. Background Technology

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was standardized with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was standardized with the aim of further increasing capacity and improving the height of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] The development of successor systems to LTE is also underway (e.g., also known as the 5th generation mobile communication system (5G), 5G+, the 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.).

[0004] In existing LTE systems (e.g., 3GPP Rel.8-14), user equipment (UE) uses at least one of a UL data channel (e.g., Physical Uplink Shared Channel (PUSCH)) and a UL control channel (e.g., Physical Uplink Control Channel (PUCCH)) to transmit uplink control information (UCI).

[0005] Existing technical documents

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 36.300V8.12.0 "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

[0008] The problem that the invention aims to solve

[0009] In NR (5G), it is possible to more flexibly configure the design / parameters corresponding to use cases / requirements, and the channels associated with random access (initial access) can also be flexibly configured. In future wireless communication systems (e.g., 6G and beyond / Rel.17 and beyond), even higher requirements and multiple use cases are envisioned, and more flexible designs are considered.

[0010] On the other hand, depending on the requirements / use cases, sometimes by limiting / fixing the design / parameters to a certain extent, further improvements in characteristics can be expected. By fixing the design / process of the initial access, the payload size associated with the initial access settings can be reduced, the communication connectivity at the regional (cell) end can be improved, the availability of Internet of Things (IoT) / functionally limited terminals can be reduced, and ultra-long-distance communication can be achieved.

[0011] Therefore, one of the objectives of this disclosure is to provide a terminal, wireless communication method, and base station that can reduce the payload size associated with the initial access setup.

[0012] Methods for solving problems

[0013] The terminal involved in one aspect of this disclosure is characterized by having: a receiving unit that, during the initial access process, does not receive at least one of the Broadcast Channel (PBCH), Physical Downlink Control Channel (PDCCH), and Physical Downlink Shared Channel (RMSIPDSCH) carrying system information, but receives other channels or signals; and a control unit that performs control during the initial access process based on the aforementioned other channels or signals.

[0014] The effects of the invention

[0015] According to one aspect of this disclosure, it is possible to reduce the payload size associated with the initial access settings. Attached Figure Description

[0016] Figure 1A as well as Figure 1B This is a diagram illustrating an example of the initial access process.

[0017] Figure 2 This is a diagram illustrating another example of the initial access process.

[0018] Figure 3 This is a diagram illustrating an example where the initial access procedure of the PBCH is omitted.

[0019] Figure 4 This is a diagram illustrating an example of the initial access procedure with the PDCCH omitted.

[0020] Figure 5 This is a diagram illustrating an example of the initial access procedure with RMSIPDSCH omitted.

[0021] Figure 6 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment.

[0022] Figure 7 This is a diagram illustrating an example of the structure of a base station according to one embodiment.

[0023] Figure 8 This is a diagram illustrating an example of the structure of a user terminal according to one embodiment.

[0024] Figure 9 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. Detailed Implementation

[0025] (Initial access process)

[0026] During the initial access process, the random access process used to establish uplink (UL) synchronization 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)).

[0027] In Contention-Based Random Access (CBRA), the UE transmits a preamble randomly selected from multiple preambles determined in each cell (also known as random access preambles, random access channels (Physical Random Access Channel (PRACH)), RACH preambles, etc.). Furthermore, Contention-Based Random Access is a UE-led random access procedure, and can be used, for example, at the initial access, the start of UL transmission, or at the restart of the process.

[0028] On the other hand, in non-contention-based random access (Non-CBRA, CFRA), the network (e.g., the base station) specifically allocates a preamble to the UE via the downlink (DL) control channel (Physical Downlink Control Channel (PDCCH)), and the UE transmits the preamble allocated from the network. Non-contention-based random access is a network-led random access procedure, and can be used, for example, during handover, at the start or restart of DL transmission (at the start or restart of transmission in the UL with retransmission indication information), etc.

[0029] In NR, as CBRA, there are four-step CBRA procedures specified in Rel. 15 and two-step CBRA procedures specified in Rel. 16. The former can also be called a four-step RACH, and the latter can also be called a two-step RACH, etc.

[0030] Figure 1 is a diagram illustrating an example of the initial access procedure. First, the UE receives information (PRACH structure information) in advance, representing the structure of the random access channel (PRACH), through at least one system information (e.g., MIB (Mater Information Block) or SIB (System Information Block)) and higher-layer signaling (e.g., RRC (Radio Resource Control) signaling).

[0031] In this disclosure, higher-level signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc.

[0032] MAC signaling can also use MAC Control Element (MAC CE) or MAC Protocol Data Unit (PDU). Broadcast information can also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), or Other System Information (OSI).

[0033] exist Figure 1A In this example, the UE first receives PRACH structure information based on a Synchronization Signal Block (SSB) and minimal system information (Remaining Minimum System Information (RMSI)). An SSB is a signal block containing at least one Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and broadcast channel (Physical Broadcast Channel (PBCH)). An SSB can also be referred to as an SS / PBCH block.

[0034] The PRACH structure information may also include, for example, multiple Physical Cell IDs (PCIs) determined in each cell, multiple preambles determined in each cell (e.g., preamble format), time resources used in PRACH transmission (e.g., system frame number, subframe number), and frequency resources (e.g., the offset of the starting position of the six resource blocks (representing the Physical Resource Block (PRB)) (prach-FrequencyOffset)).

[0035] Alternatively, the monitoring location of the PDCCH can be notified via the PBCH, the resources of the RMSI (RMSIPDSCH) can be notified via the PDCCH, and the resources used in the PRACH can be notified via the RMSI.

[0036] like Figure 1AAs shown, when the UE transitions from the idle (RRC_IDLE) state to the RRC connected (RRC_CONNECTED) state (e.g., during initial access), or when it is in the RRC connected state but has not established UL synchronization (e.g., at the start or restart of UL transmission), it randomly selects one of the multiple preambles represented by the PRACH structure information and transmits the selected preamble (message 1) via PRACH.

[0037] If a preamble is detected, the base station sends a Random Access Response (RAR) as its reply (message 2). If the UE experiences RAR reception failure within a specific period (RAR window) after the preamble transmission, it increases the PRACH transmission power to retransmit (retransmit or resend) the preamble. This increase in transmission power during retransmission is also known as power ramping.

[0038] Upon receiving the RAR, the UE adjusts the UL transmission timing and establishes UL synchronization based on the timing advance (TA) included in the RAR. Furthermore, the UE transmits a higher-layer (L2 / L3) control message (Message 3) using the UL resources specified by the UL license included in the RAR. This control message contains the UE's identifier (UE-ID). This UE identifier can be, for example, a higher-layer UE-ID such as C-RNTI (Cell-Radio Network Temporary Identifier) ​​if in RRC connected state, or S-TMSI (System Architecture Evolution-Temporary Mobile Subscriber Identity) if in idle state.

[0039] The base station sends a contention resolution message (message 4) based on the control messages from higher layers. This contention resolution message is sent based on the identifier sent to the user terminal included in the aforementioned control message. Upon successful detection of the contention resolution message, the user terminal sends an acknowledgment (ACK) response in a HARQ (Hybrid Automatic Repeat reQuest) to the network. As a result, the idle UE transitions to the RRC connected state.

[0040] On the other hand, if the contention resolution fails to detect the message, the UE determines that a conflict has occurred, reselects the preamble, and repeatedly performs the random access procedure for messages 1 to 4. If the radio base station detects that the conflict has been resolved based on the ACK from the user terminal, it sends a UL grant to the UE. The UE then uses the UL resources allocated through the UL grant to begin UL data.

[0041] In the contention-based random access described above, the random access procedure can be initiated autonomously when the UE wishes to transmit UL data. Furthermore, after UL synchronization is established, UL data can be transmitted using UL resources specifically allocated to the user terminal through UL authorization, enabling highly reliable UL transmission. Messages 1-4 in the initial access procedure can also be referred to as the random access procedure.

[0042] However, NR Rel.16 is exploring random access procedures using fewer steps than the existing four steps. As an example, there is a random access procedure that utilizes two steps. A random access procedure utilizing two steps is also known as a two-step random access procedure, two-step RACH, or 2-step RACH.

[0043] A two-step RACH can also consist of a first step, where the UE transmits data to the network, and a second step, where the network transmits data to the UE (see reference). Figure 1B ).

[0044] For example, in the first step, at least one of the UL signal containing the preamble and the message, and the UL channel, can be transmitted from the UE to the network (base station). The preamble can also be a structure that functions the same as message 1 (PRACH) in the existing random access procedure. The message can also be a structure that functions the same as message 3 (PUSCH) in the existing random access procedure. Alternatively, the preamble and message transmitted in the first step can also be referred to as message A (Msg.A) or the first message.

[0045] Furthermore, in the second step, at least one of the DL signal containing the response and contention-resolution, as well as the DL channel, can be sent from the network (base station) to the UE. The response can also have the same structure as message 2 (the random access response (RAR) sent via PDSCH) in the existing random access procedure. Contention-resolution can also have the same structure as message 4 (PDSCH) in the existing random access procedure. Alternatively, the message sent in the second step can also be referred to as message B (Msg.B) or the second message.

[0046] Figure 2 This is a diagram illustrating another example of the initial access process. In Figure 2 The diagram illustrates the allocation of channels / information within time / frequency resources. The processing flow is as follows: Figure 1A The details are the same, so a detailed explanation is omitted. Figure 2 The upper and lower diagrams are connected by part (A). Figure 2 The example shows receiving each signal / channel through one of four beams. Blank blocks represent blocks corresponding to other beams.

[0047] RMSI can also be a PDSCH carrying RMSI (RMSIPDSCH). Message 2 can also be a PDSCH carrying message 2 (Message 2PDSCH). Message 3 can also be a PUSCH carrying message 3 (Message 3PUSCH). Message 4 can also be a PDSCH carrying message 4 (Message 4PDSCH). PDSCH carrying RMSI / Message 2 / Message 4 can also be scheduled via PDCCH.

[0048] (PBCH)

[0049] During initial access, the MIB (Master Information Block) within the MSI (Minimum System Information) read by the UE is transmitted via the PBCH. The remaining MSI is the RMSI (Remaining Minimum System Information), equivalent to SIB (System Information Block) 1 and SIB2 in LTE. Furthermore, the RMSI is scheduled via the PDCCH specified by the MIB (or via the PDCCH transmitted via the CORESET specified by the MIB).

[0050] For example, the MIB content (information elements) includes SystemFrameNumber, subCarrierSpacingCommon, Ssb-subcarrierOffset, Dmrs-TypeA-Position, pdcchConfigSIB1, cellBarred, intraFreqReselection, etc.

[0051] SystemFrameNumber indicates the high 6 bits of the system frame number (SFN). subCarrierSpacingCommon indicates the subcarrier spacing (SCS, parameter set) used for RMSI reception. Ssb-subcarrierOffset indicates the PRB (Physical Resource Block) grid offset used for RMSI reception. Dmrs-TypeA-Position indicates the symbol position of the DMRS used for PDSCH (whether it's the third or fourth symbol in the time slot). pdcchConfigSIB1 (also known as RMSI-PDCCH-Config) indicates the PDCCH (or the parameter set of the CORESET (Control Resource Set) or RMSI CORESET) used for RMSI reception (PDCCH parameter set). cellBarred indicates whether the cell is (Barred / NotBarred) and cannot be camped. intraFreqReselection indicates whether there are (allowed / not allowed) campable cells within the same frequency (carrier bandwidth).

[0052] However, in NR (5G), it is possible to more flexibly configure the design / parameters to correspond to use cases / requirements, and the channels associated with random access (initial access) can also be flexibly configured. In future wireless communication systems (e.g., 6G and beyond / Rel.17 and beyond), even higher requirements and multiple use cases are envisioned, requiring more flexible designs.

[0053] On the other hand, depending on the requirements / use cases, sometimes by limiting / fixing the design / parameters to a certain extent, further improvements in characteristics can be expected. By fixing the design / process of the initial access, the payload size associated with the initial access settings can be reduced, the communication connectivity at the regional (cell) end can be improved, the availability of IoT / functionally limited terminals can be enhanced, and ultra-wide coverage extension and ultra-long-distance communication can be achieved.

[0054] Therefore, the inventors of this invention conceived of a terminal capable of reducing the payload size associated with the initial access settings.

[0055] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods involved in each embodiment can be applied individually or in combination. For example, any one of the above-described four-step random access process, two-step random access process, and the following examples can also be applied in combination.

[0056] Additionally, in this disclosure, “A / B” can also be replaced with “at least one of A and B”.

[0057] In this disclosure, PDSCH, RMSI, RMSIPDSCH, message 2, message 2PDSCH, message 4, and message 4PDSCH can be interchanged. PUSCH, message 3, and message 3PUSCH can also be interchanged. RACH, PRACH, message 1, random access preamble, and RACH preamble can also be interchanged.

[0058] In this disclosure, the terms "fixed," "limited," and "specified" are interchangeable. "Limited" can also mean limited to a specific value / parameter / range. "Initial access," "initial access procedure," "random access," and "random access procedure" are also interchangeable. Furthermore, "specified" can also mean specified by a standard. In this disclosure, "design," "structure," "setting," "parameter," "value," and "setting range" are also interchangeable. Omitting A can also indicate omitting a portion of A. Omitting A can also indicate that the UE does not receive A.

[0059] (Wireless communication method)

[0060] <The omission of PBCH>

[0061] The UE may also choose not to receive the PBCH, but instead use other channels / signals to receive at least a portion of the information received using the previous PBCH (e.g., information within the MIB content mentioned above) (see reference). Figure 3 In addition, the UE can also receive the PBCH, but omit at least a portion of the information transmitted via the PBCH.

[0062] The UE can also use PSS / SSS to receive information received using the existing PBCH. For example, the UE can also use PSS / SSS to receive cell-related information (cellBarred, intraFreqReselection), and SSB indexes. By increasing the number of signal sequences / symbols in the PSS / SSS, information received using the existing PBCH can also be included. A third (tertiary) SS can also be configured, containing information received via the PBCH.

[0063] Even when the PBCH is omitted, a structure that removes the PBCH from the existing system's SS / PBCH block can be used. Alternatively, a structure that removes the PBCH from the existing system's SS / PBCH block, and alters the positional relationship of the PSS and SSS, the allocation of the frequency domain, and the allocation of the time domain, can also be used. Alternatively, the PSS / SSS configuration can be determined differently from the existing system's SS / PBCH block.

[0064] When a portion of the PBCH is omitted, a structure can also be applied by removing a portion of the PBCH from the existing system's SS / PBCH block. For example, it could be a structure that omits one symbol from a PBCH that is included in a 2-symbol PBCH block. The omitted PBCH symbol can be either the PBCH with the first symbol configured in the time direction or the PBCH with the second symbol configured.

[0065] By restricting or uniquely specifying the settings of RMSI / PDCCH (e.g., monitoring location, resources), information related to RMSI / PDCCH / CORESET included in PBCH can also be omitted. For example, it can be specified that PDCCH / CORESET is transmitted / set in the same time slot as SSB. The relative relationship between the starting RB / RB number (starting symbol / number of symbols) of RMSI / PDCCH / CORESET and SSB or PSS / SSS can also be specified. Through these specifications, PBCH information can be omitted.

[0066] The UE can also receive information received via the existing PBCH (e.g., System Frame Number) via RMSI. The UE can also receive information received via the existing PBCH, for example, within configuration information (RACH-ConfigCommon, rach-ConfigGeneric) related to the RACH transmitted via RRC.

[0067] <Omission of PDCCH>

[0068] The UE may also choose not to receive the PDCCH, but instead use other channels / signals to receive at least a portion of the information received using the previous PDCCH (see reference). Figure 4 The PDCCH can also be at least one of the PDCCHs used in the scheduling of RMSI PDSCH, the PDCCHs used in the scheduling of message 2, and the PDCCHs used in the scheduling of message 4. The information can also be, for example, information related to the scheduling of the PDSCH (Time Domain Resource Assignment / Allocation (TDRA)), Frequency Domain Resource Assignment / Allocation (FDRA) of the DCI, etc.). Alternatively, the UE can also receive the PDCCH, but omit at least a portion of the information transmitted via the PDCCH. The PDCCH can also be replaced with CORESET or DCI.

[0069] [Information related to RMSIPDSCH]

[0070] For example, the UE can also use the PBCH to receive information related to the frequency / time resources of the RMSIPDSCH (RMSI) (see reference). Figure 4 (1)). For example, information related to the monitoring of PDCCH can be removed from PBCH, or alternatively, configuration information related to RMSIPDSCH (TDRA / FDRA / Modulation and Coding Scheme (MCS)) can be included in PBCH.

[0071] For example, it can be specified that the RMSI is transmitted in the same time slot as the SSB. The allocation / setting conditions for the RMSIPDSCH can also be specified. The allocation / setting conditions for the RMSIPDSCH can be, for example, at least one of the following: the number of symbols in the PDSCH, the starting RB, and the number of RBs. Furthermore, the allocation / setting conditions for the RMSIPDSCH can also be the relative relationship between the RMSIPDSCH and the SSB.

[0072] [Information related to message 2PDSCH / message 4PDSCH]

[0073] The UE can also use RMSI (RMSIPDSCH) to receive monitoring information (related to frequency / time resources) from message 2PDSCH / message 4PDSCH (hereinafter referred to as message 2 / 4) (see reference). Figure 4 (2)). For example, the UE can also monitor the corresponding PDSCH within the window after receiving RACH / message 3.

[0074] Resources for messages 2 / 4 can also be restricted. For example, resources for messages 2 / 4 can be set (restricted) after a specific time slot following the transmission time slot of RACH / message 3. To reduce the information content of message 2, information related to the scheduling of message 3 (e.g., TDRA / FDRA) can also be restricted / limited. UE discrimination can also be performed using the RA-RNTI / TC-RNTI used in the CRC scrambling of messages 2 / 4.

[0075] Information related to message 2 / 4 included in the PDCCH can be omitted by restricting or uniquely specifying the settings of message 2 / 4 (e.g., monitoring location, resources). Allocation / setting conditions for message 2 / 4 can also be specified. These conditions can be, for example, at least one of the following: the number of time slots / symbols, the starting RB, or the number of RBs. Furthermore, the allocation / setting conditions for message 2 / 4 can also be the relative relationship between message 2 / 4 and the SSB. Through these specifications, information in the PDCCH can be omitted.

[0076] [other]

[0077] Alternatively, a dedicated signal / channel can be specified for notifying at least one of the information related to RMSI and message 2 / 4. Since the payload size of message 2 / 4 is determined to some extent, it can also be configured and channel generated in a manner similar to that of the Physical Sidelink Control Channel (PSCCH).

[0078] <Omission of RMSIPDSCH>

[0079] The UE may also choose not to receive the RMSIPDSCH (PDSCH carrying the RMSI) and instead use other channels / signals to receive at least a portion of the information received using the previous RMSIPDSCH (see reference). Figure 5 Alternatively, the UE may receive RMSIPDSCH, but omit at least a portion of the information transmitted via RMSI PDSCH. In the case of omitting RMSIPDSCH, the PDCCH that schedules RMSIPDSCH may also be omitted.

[0080] [PBCH-based notifications]

[0081] The UE can also use the PBCH to receive information related to RACH (PRACH) transmission (such as resource information). In this case, the RACH settings can be restricted / limited to reduce the amount of information transmitted via the PBCH.

[0082] Regarding frequency resources for RACH, the starting position of RACH (starting PRB (msg1-FrequencyStart)) and at least one of the number of PRBs can also be specified to specific values. Alternatively, the RACH grouping (RBG) can also be specified. For example, a specific number of PRBs (e.g., 4 PRBs) can be grouped together, and resources can be configured on a group basis.

[0083] Regarding the time resources for RACH, for example, the period of RACH occasions can also be limited (e.g., in equation (1), x = 16, y = 1). SFN It is the system frame rate.

[0084] n SFN mod x=y (1)

[0085] In addition, the number of subframes / time slots can also be limited (e.g., number of subframes = 3, number of time slots = 7).

[0086] [Notification based on PDCCH]

[0087] The UE can also use the PDCCH to receive information related to RACH transmission (such as resource information). That is, the PDCCH can also be used for notifications and scheduling related to RACH transmission. In order to reduce the amount of information in the PDCCH (DCI), similar to the case of notification based on the PBCH mentioned above, the frequency / time resources of the RACH can also be limited.

[0088] Alternatively, a new DCI format can be specified that includes settings related to RACH transmission, such as the prach-ConfigurationIndex, and information related to RACH transmission can be communicated using this new DCI format.

[0089] [RACH's restrictions / regulations]

[0090] By restricting or uniquely specifying the RACH settings (e.g., monitoring location, resources), information related to the RACH included in the RMSIPDSCH can also be omitted. The relative positions (slots / symbols / PRBs) of the RACH and SSB / PDCCH can also be specified.

[0091] [other]

[0092] To accommodate the addition of settings such as RMSI accompanying terminal feature expansion, the PBCH / DCI can also be extended. For example, the reserved bits (R) of the expanded size can be set as the payload of the PBCH / PDCCH. Furthermore, PBCH resources can also be extended. For example, the extended terminal can decode the resources of the extended PBCH symbols / RBs. When using PDCCH to notify information omitted from RMSIPDSCH, a new DCI format can be specified along with the terminal's feature expansion, and this information can be notified through this DCI format.

[0093] The communication control omitting PBCH / PDCCH / RMSI during the initial access can also be excluded from application after RRC connection. For example, communication control omitting PBCH / PDCCH / RMSI can be applied during initial access, but not after RRC connection. Alternatively, communication control omitting PBCH / PDCCH / RMSI can be applied after RRC connection in the same manner as during initial access. Whether to apply communication control omitting PBCH / PDCCH / RMSI after RRC connection can also be configured for the UE via higher-layer signaling.

[0094] (Wireless Communication System)

[0095] The structure of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of this disclosure.

[0096] Figure 6 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment. The wireless communication system 1 can also be a system that uses Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) as standardized by the Third Generation Partnership Project (3GPP).

[0097] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0098] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0099] Wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (e.g., MN and SN are dual connectivity of NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0100] The wireless communication system 1 may also include a base station 11 forming a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a-12c) configured within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the arrangement shown in the figure. Hereinafter, without distinguishing between base stations 11 and 12, they will be collectively referred to as base station 10.

[0101] User terminal 20 may also connect to at least one of multiple base stations 10. User terminal 20 may also utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0102] Each CC can 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)). Macro cell C1 can also be included in FR1, and small cell C2 can also be included in FR2. For example, FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and FR2 can also be a frequency band above 24 GHz (above-24 GHz). Furthermore, the frequency bands and definitions of FR1 and FR2 are not limited to these; for example, FR1 can also be equivalent to a frequency band higher than FR2.

[0103] In addition, user terminal 20 can also use at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) to communicate in each CC.

[0104] Multiple base stations 10 can also be connected via wired (e.g., fiber optic cable based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, base station 11, which is equivalent to a host station, can also be referred to as an Integrated Access Backhaul (IAB) donor, and base station 12, which is equivalent to a relay station, can also be referred to as an IAB node.

[0105] Base station 10 may also be connected to core network 30 via other base stations 10 or directly. Core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0106] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0107] In wireless communication system 1, wireless access methods based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the downlink (DL) and uplink (UL) links, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA) can also be used.

[0108] The wireless access method can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used in the wireless access methods of UL and DL.

[0109] As a downlink channel, the wireless communication system 1 can also use downlink shared channels (Physical Downlink Shared Channel (PDSCH)), broadcast channels (Physical Broadcast Channel (PBCH)), downlink control channels (Physical Downlink Control Channel (PDCCH)) and so on, which are shared by each user terminal 20.

[0110] In addition, as uplink channels, the wireless communication system 1 may also use uplink shared channels (Physical Uplink Shared Channel (PUSCH)), uplink control channels (Physical Uplink Control Channel (PUCCH)), random access channels (Physical Random Access Channel (PRACH)) and so on, which are shared by each user terminal 20.

[0111] User data, high-level control information, and System Information Blocks (SIBs) are transmitted via the PDSCH. User data and high-level control information can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0112] Lower-layer control information can also be transmitted via PDCCH. Lower-layer control information may include, for example, downlink control information (DCI), which includes scheduling information for at least one of PDSCH and PUSCH.

[0113] Additionally, the DCI that schedules PDSCH can also be called DL allocation, DL DCI, etc., and the DCI that schedules PUSCH can also be called UL authorization, UL DCI, etc. Furthermore, PDSCH can also be replaced with DL data, and PUSCH can also be replaced with UL data.

[0114] In PDCCH detection, a Control Resource Set (CORESET) and a search space can be utilized. A CORESET corresponds to the resources used to search for DCIs. 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 CORESETs associated with a specific search space based on search space settings.

[0115] A search space can also correspond to one or more PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", and "CORESET setting" used in this disclosure can be used interchangeably.

[0116] Uplink control information (UCI) including at least one of Channel State Information (CSI), delivery confirmation information (such as Hybrid Automatic Repeat reQuest ACK knowledgement (HARQ-ACK), ACK / NACK, etc.), and Scheduling Request (SR) can also be transmitted via PUCCH. Random access preambles used for establishing a connection with the cell can also be transmitted via PRACH.

[0117] Furthermore, in this disclosure, downlink, uplink, etc., may be described without the word "link". Additionally, various channels may be described without the word "physical".

[0118] In wireless communication system 1, synchronization signals (SS) and downlink reference signals (DL-RS) can also be transmitted. As DL-RS, wireless communication system 1 can also transmit cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), phase tracking reference signals (PTRS), etc.

[0119] Synchronization signals can be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be called an SS / PBCH block, SS block (SSB), etc. Furthermore, SS, SSB, etc., can also be called reference signals.

[0120] Furthermore, in the wireless communication system 1, the uplink reference signal (UL-RS) can also transmit measurement reference signals (sounding reference signals (SRS)) and demodulation reference signals (DMRS). Additionally, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific reference signal).

[0121] (Base station)

[0122] Figure 7This diagram illustrates an example of the structure of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmit / receive unit 120, a transmit / receive antenna 130, and a transmission path interface (transmission line interface) 140. Alternatively, the control unit 110, the transmit / receive unit 120, the transmit / receive antenna 130, and the transmission path interface 140 may each be provided in more than one manner.

[0123] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it can also be envisioned that the base station 10 also possesses other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0124] The control unit 110 performs overall control of the base station 10. The control unit 110 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0125] The control unit 110 can also control signal generation and scheduling (e.g., resource allocation, mapping). The control unit 110 can also control transmission, reception, and measurement using the transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140. The control unit 110 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmit / receive unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of the communication channel, status management of the base station 10, and management of wireless resources.

[0126] The transmitting / receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting / receiving unit 120 can be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0127] The transmitting and receiving unit 120 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 1211 and an RF unit 122. The receiving unit can also be composed of a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0128] The transmitting and receiving antenna 130 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0129] The transmitting / receiving unit 120 can also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 can also receive the aforementioned uplink channel, uplink reference signal, etc.

[0130] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0131] The transmitting and receiving unit 120 (transmitting processing unit 1211) may, for example, perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer (e.g., RLC retransmission control), and Medium Access Control (MAC) layer (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0132] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output the baseband signal.

[0133] The transmitting and receiving unit 120 (RF unit 122) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 130.

[0134] On the other hand, the transmitting and receiving unit 120 (RF unit 122) can also amplify, filter, and demodulate the signals of the wireless frequency band received through the transmitting and receiving antenna 130 into the baseband signal.

[0135] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including 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 acquire user data, etc.

[0136] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc., based on the received signal. The measurement unit 123 can also measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 110.

[0137] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30 and other base stations 10, and can also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0138] In addition, the transmitting unit and receiving unit of the base station 10 in this disclosure may also be composed of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0139] Alternatively, during the initial access process, the transmitting and receiving unit 120 may not transmit at least one of the broadcast channel (PBCH), physical downlink control channel (PDCCH), or physical downlink shared channel (RMSIPDSCH) carrying system information, but may instead transmit other channels or signals.

[0140] The control unit 110 may also perform control during the initial access process based on the other channels or signals mentioned above.

[0141] (User terminal)

[0142] Figure 8 This diagram illustrates an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Alternatively, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be included.

[0143] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it is also conceivable that the user terminal 20 may also have other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0144] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the technical field to which this disclosure pertains.

[0145] The control unit 210 can also control signal generation, mapping, etc. The control unit 210 can also control transmission, reception, measurement, etc., using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmission / reception unit 220.

[0146] The transmitting / receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting / receiving unit 220 may be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0147] The transmitting and receiving unit 220 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit can also be composed of a receiving processing unit 2212, an RF unit 222, and a measurement unit 223.

[0148] The transmitting and receiving antenna 230 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0149] The transmitting / receiving unit 220 can also receive the downlink channel, synchronization signal, downlink reference signal, etc., mentioned above. The transmitting / receiving unit 220 can also transmit the uplink channel, uplink reference signal, etc., mentioned above.

[0150] The transmitting and receiving unit 220 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0151] The transmitting and receiving unit 220 (transmitting processing unit 2211) may, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 210, and generate the bit string to be transmitted.

[0152] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may 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 transmitted, and output the baseband signal.

[0153] Furthermore, the application of DFT processing can be based on the transform precoding settings. For a specific channel (e.g., PUSCH), if transform precoding is enabled, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above for transmitting the channel using the DFT-s-OFDM waveform. Otherwise, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above without performing DFT processing.

[0154] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 230.

[0155] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also amplify, filter, and demodulate the baseband signal for the wireless frequency band signal received by the transmitting and receiving antenna 230.

[0156] The transmitting and receiving unit 220 (receiving and processing unit 2212) can also perform receiving and processing on the acquired baseband signal, such as 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 acquire user data.

[0157] The transmitting / receiving unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc., based on the received signal. The measurement unit 223 can 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 can also be output to the control unit 210.

[0158] Alternatively, the transmitting and receiving units of the user terminal 20 in this disclosure may also be composed of at least one transmitting / receiving unit 220 and transmitting / receiving antenna 230.

[0159] Alternatively, during the initial access process, the transmitting and receiving unit 220 may not receive at least one of the broadcast channel (PBCH), physical downlink control channel (PDCCH), or physical downlink shared channel (RMSIPDSCH) carrying system information, but may instead receive other channels or signals.

[0160] The transmitting and receiving unit 220 may also, during the initial access process, not receive the PBCH, but receive other channels or signals containing at least one of the cell-related information, synchronization signal block (SSB) index, and system frame number.

[0161] The sending and receiving unit 220 may also, during the initial access process, not receive the PDCCH, but use the PBCH to receive resource-related information of the RMSIPDSCH, and use the RMSIPDSCH to receive resource-related information of message 2PDSCH and message 4PDSCH.

[0162] The transmitting and receiving unit 220 may also choose not to receive the RMSIPDSCH, but instead use the PBCH or the PDCCH to receive information related to the transmission of the Random Access Channel (RACH).

[0163] The control unit 210 can also perform control during the initial access process based on the other channels or signals mentioned above.

[0164] (Hardware Structure)

[0165] Furthermore, the block diagrams used in the description of the above embodiments illustrate functional units. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Moreover, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a single device that is physically or logically combined, or it can be implemented by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. A functional block can also be implemented by combining the aforementioned single device or multiple devices with software.

[0166] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, regard as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that implements the sending function can also be called a transmitting unit, transmitter, etc. As described above, the implementation method is not particularly limited.

[0167] For example, in one embodiment of this disclosure, the base station, user terminal, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 9 This diagram illustrates an example of the hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0168] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured not to include any of the apparatuses.

[0169] For example, only one processor 1001 is shown, but there can be multiple processors. Furthermore, processing can be performed by one processor, or simultaneously, sequentially, or by two or more processors using other methods. Additionally, processor 1001 can be implemented using more than one chip.

[0170] The functions of the base station 10 and the user terminal 20 are implemented, for example, by reading specific software (programs) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 can perform calculations and control communication via the communication device 1004, or control at least one of reading out and writing data in the memory 1002 and the storage device 1003.

[0171] The processor 1001, for example, enables the operating system to operate and control the computer as a whole. The processor 1001 may also be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic devices, registers, etc. For example, at least a portion of the control unit 110 (210), the transmit / receive unit 120 (220), etc., described above may also be implemented by the processor 1001.

[0172] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a portion of the operations described in the above embodiments can be 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; similar implementations can be made for other functional blocks.

[0173] The memory 1002 may also be a computer-readable recording medium, such as being composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 is capable of storing executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of this disclosure.

[0174] Storage device 1003 may also be a computer-readable recording medium, such as comprising at least one of a flexible disc, floppy disk, optical disk (e.g., compact disc ROM, CD-ROM), digital multifunction disk, Blu-ray disc, removable disk, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. Storage device 1003 may also be referred to as an auxiliary storage device.

[0175] The communication device 1004 is hardware (transmitting and receiving device) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. To implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmit / receive unit 120 (220) and transmit / receive antenna 130 (230) may also be implemented by the communication device 1004. The transmit / receive unit 120 (220) may also be implemented by physically or logically separating the transmit unit 120a (220a) and the receive unit 120b (220b).

[0176] Input device 1005 is an input device that receives input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, light-emitting diode (LED) lamp, etc.). Alternatively, input device 1005 and output device 1006 can also be an integrated structure (e.g., touch panel).

[0177] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 can be configured as a single bus or as different buses between the devices.

[0178] Furthermore, the base station 10 and the user terminal 20 can 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), or a field-programmable gate array (FPGA), and can be used to implement some or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0179] (Modified Example)

[0180] Furthermore, the terms described in this disclosure, as well as those necessary for understanding this disclosure, may be replaced with terms that have the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Additionally, a signal may also be a message. A reference signal may also be abbreviated as RS, and may be referred to as pilot, pilot signal, etc., depending on the applied standard. Furthermore, a component carrier (CC) may also be referred to as cell, frequency carrier, carrier frequency, etc.

[0181] A radio frame can also be composed of one or more periods (frames) in the time domain. Each of these periods (frames) that constitutes a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0182] Here, the parameter set can also be communication parameters applied in at least one of the transmission and reception of a signal or channel. For example, the parameter set can also represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0183] In the time domain, a time slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). Furthermore, a time slot can also be a time unit based on a set of parameters.

[0184] A time slot can also contain multiple mini-time slots. Each mini-time slot can also consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-time slot can also be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-time slots can also be called PDSCH (PUSCH) mapping type B.

[0185] 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 can also use their respective other names. Furthermore, the time units such as frames, subframes, time slots, mini-time slots, and symbols used in this disclosure can be used interchangeably.

[0186] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, a time slot or a mini-time slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe in existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but a time slot, mini-time slot, etc.

[0187] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules radio resources (frequency bandwidth, transmit power, etc., available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0188] TTI can also be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., and can also be a unit of processing such as scheduling and link adaptation. In addition, when a TTI is given, the actual time interval (e.g., the number of symbols) mapped to transmission blocks, code blocks, codewords, etc. can be shorter than the TTI.

[0189] Additionally, where a time slot or a mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can also serve as the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit of the schedule can also be controlled.

[0190] A TTI with a duration of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini time slot, sub-time slot, time slot, etc.

[0191] In addition, long TTIs (e.g., normal TTIs, subframes, etc.) can be replaced with TTIs with a duration of more than 1 ms, and short TTIs (e.g., shortened TTIs, etc.) can be replaced with TTIs with a duration of less than long TTIs but more than 1 ms.

[0192] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can also contain one or more consecutive subcarriers. The number of subcarriers in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers in an RB can also be determined based on the parameter set.

[0193] Furthermore, an RB can contain one or more symbols in the time domain, and can also be a time slot, a mini-time slot, a subframe, or the length of a TTI. A TTI, a subframe, etc., can also be composed of one or more resource blocks.

[0194] In addition, one or more RBs can also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0195] Furthermore, a resource block can also consist of one or more resource elements (REs). For example, an RE can also be a radio resource area consisting of a subcarrier and a symbol.

[0196] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a certain carrier. Here, common RBs can also be determined by the index of RBs based on the common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0197] A BWP can also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs can also be set within a single carrier.

[0198] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Furthermore, terms such as "cell" and "carrier" in this disclosure can be replaced with "BWP".

[0199] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0200] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0201] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical expressions, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0202] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0203] Furthermore, information, signals, etc., can be output in at least one of the following directions: from higher level (upper layer) to lower level (lower layer), and from lower layer to higher level. Information, signals, etc., can also be input and output via multiple network nodes.

[0204] Input and output information, signals, etc., can be stored in a specific location (e.g., memory) or managed using management tables. Input and output information, signals, etc., can be overwritten, updated, or appended. Output information, signals, etc., can also be deleted. Input information, signals, etc., can also be sent to other devices.

[0205] The notification of information is not limited to the methods / implementations described in this disclosure, and may also be carried out by other methods. For example, the notification of information in this disclosure may also be implemented by physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI), etc.), higher layer signaling (e.g., radio resource control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB) etc.), medium access control (MAC) signaling), other signals, or combinations thereof.

[0206] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. Furthermore, RRC signaling can also be referred to as RRC messages, such as RRC connection setup messages, RRC connection reconfiguration messages, etc. Additionally, MAC signaling can also be notified using, for example, the MAC control element (CE).

[0207] Furthermore, notification of specific information (e.g., a notification that “is X”) is not limited to explicit notification, but can also be implicit (e.g., by not providing that specific information, or by providing other information).

[0208] The determination can be made by a value represented by a single bit (0 or 1), by a true or false value (boolean), or by a numerical comparison (e.g., a comparison with a specific value).

[0209] Whether software is called software, firmware, middleware, microcode, hardware description language, or any other name, it should be broadly interpreted to refer to instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0210] Furthermore, software, instructions, and information can also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0211] The terms “system” and “network” as used in this disclosure are used interchangeably. “Network” may also mean devices included in a network (e.g., base stations).

[0212] In this disclosure, the terms "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "transmission configuration indication state (TCI state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beamwidth", "beam angle", "antenna", "antenna element", and "panel" are used interchangeably.

[0213] In this disclosure, the terms "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" are used interchangeably. There are also instances where the terms macro cell, small cell, femtocell, and picocell are used to refer to a base station.

[0214] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0215] In this disclosure, the terms “Mobile Station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” are used interchangeably.

[0216] There are also instances where mobile stations are referred to as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, clients, or several other appropriate terms.

[0217] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. This mobile body can be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0218] Furthermore, the base station in this disclosure can also be replaced by a user terminal. For example, various methods / implementations of this disclosure can be applied to structures where communication between the base station and the user terminal is replaced by communication between multiple user terminals (e.g., also referred to as device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, it can also be configured such that the user terminal 20 has the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to inter-terminal communication (e.g., "sidelink"). For example, uplink channel, downlink channel, etc., can also be replaced with sidelink channel.

[0219] Similarly, the user terminal in this disclosure can also be replaced by a base station. In this case, it can also be configured such that the base station 10 has the functions of the user terminal 20 described above.

[0220] In this disclosure, operations are assumed to be performed by the base station, and sometimes, depending on the circumstances, by its upper node. Clearly, in a network containing one or more network nodes having a base station, various operations for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or combinations thereof.

[0221] The various methods / implementations described in this disclosure can be used individually or in combination, and can be switched as needed during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of the various methods / implementations described in this disclosure can be rearranged as long as they do not contradict each other. For example, with respect to the methods described in this disclosure, the illustrated order is used to indicate various steps, but the order in which they are indicated is not limited.

[0222] The various methods / implementations described in this disclosure can 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), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), 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 This includes 802.11 (Wi-Fi, registered trademark), IEEE 802.16 (WiMAX, registered trademark), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (registered trademark), systems utilizing other suitable wireless communication methods, and next-generation systems derived from them. Furthermore, multiple systems can be combined (e.g., LTE or LTE-A, combinations with 5G, etc.) for application.

[0223] As used in this disclosure, the term "based on" does not mean "based on only" unless otherwise specified. In other words, the term "based on" means both "based on only" and "based on at least".

[0224] The term "determining" as used in this disclosure can encompass a wide variety of operations. For example, "determining" can also refer to judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), and ascertaining.

[0225] In addition, "judgment (decision)" can also refer to receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, accessing (e.g., accessing data in memory), etc., as situations where "judgment (decision)" is performed.

[0226] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, or comparing are considered as making a "judgment (decision)". In other words, "judgment (decision)" can also refer to certain actions as situations where a "judgment (decision)" is made.

[0227] In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0228] As used in this disclosure, the terms "connected," "coupled," or any variations thereof, refer to all direct or indirect connections or combinations between two or more elements, and can include cases where there is one or more intermediate elements between two mutually "connected" or "coupled" elements. The connections or combinations between elements can be physical, logical, or a combination thereof. For example, "connected" can also be replaced with "access."

[0229] In this disclosure, when two elements are connected, it is possible to use more than one wire, cable, printed electrical connection, etc., and to use electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region as several non-limiting and non-inclusive examples, so that they are "connected" or "combined" with each other.

[0230] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other." Additionally, the term can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0231] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," mean inclusive. Furthermore, the term "or" as used in this disclosure does not mean XOR.

[0232] In this disclosure, for example, in cases where articles are added through translation, such as a, an, and the in English, the disclosure may also include cases where the noun following these articles is in a plural form.

[0233] The invention disclosed herein has been described in detail above. However, it will be apparent to those skilled in the art that the invention is not limited to the embodiments described herein. The invention can be implemented with modifications and variations without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description in this disclosure is for illustrative purposes only and is not intended to limit the invention in any way.

Claims

1. A terminal, comprising: The receiving unit, during the initial access process, does not receive at least one of the Broadcast Channel PBCH, Physical Downlink Control Channel PDCCH, or Physical Downlink Shared Channel RMSI PDSCH carrying system information, but instead uses other channels or signals to receive at least a portion of the information received using the PBCH, the PDCCH, or the RMSI PDSCH; and The control unit performs control during the initial access process based on the aforementioned other channels or signals. The receiving unit does not receive the PBCH during the initial access process, but receives the primary synchronization signal PSS / secondary synchronization signal SSS containing cell-related information and the synchronization signal block SSB index, and the RMSIPDSCH containing the system frame number.

2. A wireless communication method for a terminal, comprising: During the initial access process, the step of not receiving at least one of the Broadcast Channel PBCH, Physical Downlink Control Channel PDCCH, or Physical Downlink Shared Channel RMSI PDSCH carrying system information, but instead using other channels or signals to receive at least a portion of the information received using the PBCH, the PDCCH, or the RMSI PDSCH; and The control steps in the initial access process are based on the other channels or signals mentioned above. During the initial access process, the PBCH is not received; instead, the primary synchronization signal PSS / secondary synchronization signal SSS containing cell-related information and the synchronization signal block SSB index, and the RMSI PDSCH containing the system frame number are received.

3. A base station, comprising: The transmitting unit, during the initial access process, does not transmit at least one of the Broadcast Channel PBCH, Physical Downlink Control Channel PDCCH, or Physical Downlink Shared Channel RMSI PDSCH carrying system information, but instead uses other channels or signals to transmit at least a portion of the information transmitted using the PBCH, the PDCCH, or the RMSI PDSCH; and The control unit performs control during the initial access process based on the aforementioned other channels or signals. The transmitting unit does not transmit the PBCH during the initial access process, but transmits the primary synchronization signal PSS / secondary synchronization signal SSS containing cell-related information and the synchronization signal block SSB index, and the RMSIPDSCH containing the system frame number.

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