Terminal, wireless communication method, and base station

Abstract

A terminal according to an aspect of the present disclosure is characterized by including a reception unit that receives a downlink signal in which at least a part of parameters is limited in an initial access procedure, and a control unit that controls transmission of an uplink signal in which at least a part of parameters is limited in the initial access procedure. According to an aspect of the present disclosure, it is possible to reduce the payload size related to the setting of the initial access.

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), there is greater flexibility in setting designs / parameters to suit use cases / requirements, and channels associated with random access (initial access) can also be flexibly configured. Future wireless communication systems (e.g., 6G and beyond / Rel. 17 and beyond) envision even higher requirements, more diverse use cases, and more flexible designs.

[0010] On the other hand, depending on the requirements / use cases, there are situations where further improvements in characteristics can be expected by limiting / fixing the design / parameters to a certain extent. By fixing the design / process of the initial access, the payload size associated with the initial access settings can be reduced, communication connectivity at the regional (cell) level can be improved, the availability of Internet of Things (IoT) / functionally limited terminals can be enhanced, and ultra-wide coverage 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 capable of reducing the payload size associated with the initial access setup.

[0012] Methods for solving problems

[0013] One aspect of the present disclosure relates to a terminal comprising: a receiving unit that receives, during an initial access process, a downlink signal with at least a portion of its parameters defined; and a control unit that, during the initial access process, controls the transmission of an uplink signal with at least a portion of its parameters defined.

[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 other examples of the initial access process.

[0018] Figure 3 This is a diagram illustrating the first example of a flexible region and a fixed region.

[0019] Figure 4 This is a second example illustrating both flexible and fixed regions.

[0020] Figure 5 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment.

[0021] Figure 6 This is a diagram illustrating an example of the structure of a base station according to one embodiment.

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

[0023] Figure 8 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

[0024] (Initial access process)

[0025] 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)).

[0026] In Contention-Based Random Access (CBRA), the UE transmits a preamble randomly selected from multiple preambles given for 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 process, which can be used, for example, during initial access, at the start of UL transmission, or at the restart of the process.

[0027] On the other hand, in non-contention-based random access (Non-CBRA, CFRA), the network (e.g., the base station) allocates preambles in a UE-specific manner via the downlink (DL) control channel (Physical Downlink Control Channel (PDCCH)). The UE then transmits the preamble allocated from the network. Non-contention-based random access is a network-led random access process, which can be used, for example, during handover, at the start or restart of DL transmission (when DL begins or restarts with retransmission indication information in the UL), etc.

[0028] In NR, as a CBRA, there are 4-step CBRA procedures as specified in Rel.15 and 2-step CBRA procedures as specified in Rel.16. The former can also be referred to as 4-step RACH, etc., and the latter can also be referred to as 2-step RACH, etc.

[0029] 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).

[0030] 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.

[0031] 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).

[0032] 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.

[0033] The PRACH structure information may also include, for example, multiple Physical Cell IDs (PCIs) given for each cell, multiple preambles given for each cell (e.g., preamble format), time resources for PRACH transmission (e.g., system frame number, subframe number), and frequency resources (e.g., prach-FrequencyOffset representing the starting position of the six resource blocks (PRB: Physical Resource Block)).

[0034] The monitoring location of the PDCCH can also be notified through the PBCH, and the resources of the RMSI (RMSIPDSCH) can also be notified through the PDCCH. The resources used for the PRACH can also be notified through the RMSI.

[0035] 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.

[0036] If the base station detects the preamble, it sends a Random Access Response (RAR) (message 2) as its response. If, after the preamble is sent, RAR reception fails within a specific period (RAR window), the UE increases the PRACH transmission power and retransmits the preamble (retransmission or re-transmission). Furthermore, increasing the transmission power during retransmission is also known as power ramping.

[0037] Upon receiving the RAR, the UE adjusts the UL transmission timing based on the timing advance (TA) included in the RAR to establish UL synchronization. Furthermore, the UE transmits a higher-layer (L2 / L3) control message (Message 3) using the UL resources specified in 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 C-RNTI (Cell-Radio Network Temporary Identifier) ​​in an RRC connected state, or a higher-layer UE-ID such as an S-TMSI (System Architecture Evolution-Temporary Mobile Subscriber Identity) in an idle state.

[0038] 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 user terminal identifier target contained in the aforementioned control messages. If the contention resolution message is successfully detected, the user terminal sends a positive response (ACK: Acknowledge) to the network in a HARQ (Hybrid Automatic Repeat Request). As a result, the idle UE transitions to the RRC connected state.

[0039] On the other hand, if a UE fails to detect the contention resolution message, it determines that a contention has occurred and reselects a preamble, repeatedly performing the random access procedure for messages 1 to 4. If the radio base station detects that the contention 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.

[0040] In contention-based random access as described above, the UE can autonomously initiate the random access procedure if it desires UL data transmission. Furthermore, after UL synchronization is established, UL data is transmitted using UL resources allocated in a manner specific to the user terminal through UL permission, thus enabling highly reliable UL transmission. Messages 1 to 4 in the initial access procedure can also be referred to as the random access procedure.

[0041] In NR Rel.16, research is underway on random access procedures using fewer steps than the existing four steps. As an example, a two-step random access procedure exists. This two-step random access procedure can also be referred to as a two-step random access procedure, a two-step RACH, or a 2-step RACH.

[0042] 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 ).

[0043] For example, in the first step, at least one of the UL signal containing the preamble and the message, as well as the UL channel, can be transmitted from the UE to the network (base station). The preamble can also be a structure that achieves the same function as message 1 (PRACH) in the existing random access procedure. The message can also be a structure that achieves the same function as message 3 (PUSCH) in the existing random access procedure. Alternatively, the preamble and message transmitted through the first step can also be referred to as message A (Msg.A) or the first message.

[0044] 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 a structure that achieves the same function as message 2 (Random Access Response (RAR) sent via PDSCH) in the existing random access procedure. Contention-resolution can also have a structure that achieves the same function 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.

[0045] Figure 2 These are diagrams illustrating other examples of the initial access process. In Figure 2 In this context, it represents the allocation of channels / information within time / frequency resources. The processing flow is similar to... Figure 1A Since they are the same, detailed explanations are omitted. Let's assume... Figure 2 The upper and lower images are connected by section (A). Figure 2 In the example, it indicates that each signal / channel is received by one of the four beams. Blank blocks represent blocks corresponding to other beams.

[0046] 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.

[0047] In NR (5G), there is greater flexibility in setting designs / parameters to suit use cases / requirements, and channels associated with random access (initial access) can also be flexibly configured. Future wireless communication systems (e.g., 6G and beyond / Rel. 17 and beyond) envision even higher requirements, more diverse use cases, and more flexible designs.

[0048] On the other hand, depending on the requirements / use cases, there are situations where further improvements in characteristics can be expected through a certain degree of design / parameter limitation / fixation. By fixing the design / process of the initial access, the payload size associated with the initial access settings can be reduced, communication continuity at the regional (cell) level can be improved, the availability of IoT / functionally limited terminals can be enhanced, and ultra-coverage enhancement and ultra-long-distance communication can be achieved.

[0049] Therefore, the inventors of this invention conceived of a terminal capable of reducing the payload size associated with the initial access settings.

[0050] 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, the following examples can also be combined with any of the four-step random access process or the two-step random access process described above.

[0051] Additionally, in this disclosure, “A / B” can also be replaced with “at least one of A and B”.

[0052] 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.

[0053] 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 in a standard. In this disclosure, "design," "structure," "setting," "parameter," "value," and "setting range" are also interchangeable.

[0054] (Wireless communication method)

[0055] In this disclosure, a flexible area is defined as an area where the design / parameters related to the initial access procedure (e.g., random access procedure) can be flexibly set / changed. Furthermore, a fixed area is defined as an area where at least a portion of the design / parameters related to the initial access is limited / fixed / specified. Alternatively, an area where the conditions for setting / changing the design / parameters related to the initial access are more stringent than those of the flexible area described above can also be referred to as a fixed area. Each of the flexible and fixed areas can also be divided into an area for uplink signaling and an area for downlink signaling.

[0056] That is, the UE can also receive downlink signals with at least some of the parameters defined during the initial access process, and control the transmission of uplink signals with at least some of the parameters defined.

[0057] Figure 3 This is a diagram illustrating the first example of flexible and fixed regions. Figure 3 The "synchronization channel / signal" can also be in Figure 1A , 1B The SS / PBCH block (SSB) shown. Figure 3 "Initial access" can also mean Figure 1A , Figure 1B , Figure 2 Each process within the system. "Data" can also be PDSCH / PUSCH. "Control" can also be PDCCH / PUCCH.

[0058] exist Figure 3 In this context, flexible and fixed regions exist in different frequency domains. Figure 3In this context, a flexible region can be set in the high frequency domain, while a fixed region can be set in the low frequency domain; alternatively, a flexible region can be set in the low frequency domain, while a fixed region can be set in the high frequency domain. Figure 3 In this system, flexible and fixed areas are combined for various communications (initial access, data / control). The UE can also probe for synchronization signals in any area to perform initial access based on its own capabilities and communication environment.

[0059] Figure 4 This is a second example illustrating both flexible and fixed regions. Figure 4 In China, for the sake of Figure 3 Identical points are omitted from the description. Figure 4 In this system, flexible and fixed zones are functionally distributed according to each of the various communication types (initial access, data / control). Figure 4 In this configuration, initial access is always performed within a fixed area, while data / control transmission and reception are always performed within a flexible area. Alternatively, initial access can always be performed within a flexible area, while data / control transmission and reception can always be performed within a fixed area.

[0060] exist Figure 3 as well as Figure 4 The text indicates an example where the flexible region and the fixed region exist in different frequency domains, but the flexible region and the fixed region can also exist in different time domains or different spaces (within the same frequency domain). The flexible region and the fixed region can also overlap at least partially. For example, the fixed region could be set within a portion of the flexible region.

[0061] Within a fixed area, design parameters and channels related to initial access can also be defined. For example, subcarrier spacing (SCS) and time division duplex (TDD) modes can be defined based on frequency (e.g., whether it is frequency range 1 (FR1) or FR2). Within a fixed area, the frequencies of the channel raster that can be set can also be defined. Alternatively, the interval between the frequencies that the channel raster can be set can be defined (widened).

[0062] The UE can also assume that the reception of SSB / RMSI after RRC connection is transmitted through the same area as the initial access. Alternatively, the UE can assume that the reception of SSB / RMSI after RRC connection is transmitted through a different area than the initial access. In this case, the transmission conditions of SSB, etc., can also be notified / set to the UE through higher-layer signaling.

[0063] For the random access procedure after an RRC connection, the UE can use the same area as the initial access area. Alternatively, the UE can use a different area than the initial access area for the random access procedure after an RRC connection. In this case, the conditions for the random access procedure, etc., can also be notified / set to the UE via higher-layer signaling.

[0064] The following section explains the limitations of the SS / PBCH, PDCCH, PDSCH, RACH, and PUSCH transmitted and received during the initial access process within a fixed area. These examples can also be combined.

[0065] <SS / PBCH>

[0066] During the initial access process, the transmission period of SS / PBCH (SSB) can also be limited to a specific period (e.g., 20ms). For example, the SSB period during initial access can also be limited (e.g., defined in the specification) to a specific value. Regarding the transmission period of SSB after RRC connection, its value can also be flexibly set through higher-layer signaling, etc.

[0067] The synchronization raster (synchronization signal (SS) raster) that becomes the frequency location searched during initial access can also be limited to a specific frequency (frequency range). For example, the frequency of the synchronization raster that can be set can also be limited. The frequency range (frequency interval) of the synchronization raster that can be set can also be limited (e.g., widened).

[0068] The SSB structure of a time slot (the number of time slots per SSB) can also be limited. For example, it can always be one SSB / one time slot, or it can be one SSB / half a time slot (1 / 2 time slot).

[0069] The parameters / setting range of the MIB can also be limited. For example, the number of bits in the SIB1 PDCCH setting information (pdcch-ConfigSIB1) within the MIB can be reduced / omitted, and the payload of the PBCH can also be reduced. The bits obtained by reducing / omitting the number of bits in pdcch-ConfigSIB1 can also be used for notifications of other information. Regarding pdcch-ConfigSIB1, the limitations and information reduction described in the following PDCCH-related settings restrictions can also be applied.

[0070] <PDCCH>

[0071] During the initial access process, the settings / parameters related to the PDCCH can also be limited by comparing with the PDCCH of the existing system and the PDCCH outside the initial access (PDCCH after RRC connection).

[0072] For example, at least one of the following can be limited: the number of RBs (PRBs) of the PDCCH, the number of symbols, and the offset between the PDCCH and SSB. For instance, the number of PRBs of the PDCCH can be limited to a first value (e.g., 48 PRBs), the number of symbols can be limited to a second value (e.g., two symbols), and the offset between the PDCCH and SSB can be limited to a third value (e.g., 0 or 2). The amount of information in the controlResourceSetZero (CORESET) within pdcch-ConfigSIB1 can also be reduced based on these limitations (e.g., from 4 bits to 1 bit). Tables representing these limited settings can also be specified in the specification.

[0073] The parameter (0) corresponding to the initial symbol of the PDCCH can also be limited (e.g., 0). The number of search space sets per slot can also be limited to a specific value (e.g., 1). The index of the initial symbol of the PDCCH (the index of the first symbol) can also be limited (e.g., 0). Based on these limitations, the amount of information in searchSpaceZero within pdcch-ConfigSIB1 can also be reduced (e.g., from 4 bits to 1 bit). Tables representing these limited settings can also be specified in the specification.

[0074] The location / range of PDCCH resources (time / frequency) can also be uniquely specified. For example, the settings of pdcch-ConfigSIB1 can also be uniquely specified. For example, the relative position (number of time slots / number of symbols / number of PRBs) between PDCCH and SSB or PSS / SSS can also be specified.

[0075] <PDSCH>

[0076] During the initial access process, the frequency / time resources of the PDSCH (the PDSCH corresponding to RMSI / Message 2 / Message 4 that is set via DCI) can also be limited by comparing the settable parameters with the existing PDSCH and the PDSCH outside the initial access (the PDSCH after RRC connection).

[0077] Regarding frequency resources for PDSCH, frequency domain resource assignment / allocation (FDRA) can also be defined. For example, the starting position of the PDSCH (starting PRB) and the number of PRBs can be defined to specific values. Alternatively, the grouping of PRBs (RBG) can also be specified. For example, a specific number of PRBs (e.g., 4 PRBs) can be set as one group, and resources can be allocated on a group basis. These limitations can reduce the amount of information in the FDRA field of the DCI.

[0078] Regarding the time resources of PDSCH, the Time Domain Resource Assignment / Allocation (TDRA) of DCI can also be defined. For example, the parameter indicating the position of DM-RS (dmrs-TypeA-Position) can also be defined (e.g., 2 or 3). Furthermore, the mapping type (PDSCH mapping type) can also be defined (e.g., Type A). The parameter (S) indicating the starting position of PDSCH (starting PRB) and the parameter (L) indicating the number of consecutive symbols in PDSCH can also be defined (e.g., S=2, L=12). Tables related to the defined TDRA of PDSCH (e.g., PDSCH time domain resource allocation) can also be specified in the specification. This reduces the amount of information in the TDRA field of DCI.

[0079] A new DCI (DCI format) with defined parameters / setting ranges can also be specified. This new DCI can also be a DCI with at least one limitation related to the frequency / time resources of the PDSCH described above. This new DCI can also be a DCI with a reduced payload size compared to the DCI format 1_0 for allocating (scheduling) PDSCH (a DCI scrambled by CRS via SI-RNTI).

[0080] The time / frequency resources (location / range of time / frequency resources) of PDSCH (RMSI / Message 2 / Message 4 PDSCH) can also be uniquely specified. In this case, the FDRA / TDRA of DCI can also be omitted. Furthermore, a new DCI format with the FDRA / TDRA omitted can also be specified. For example, the relative positions (number of slots / number of symbols / number of PRBs) of PDSCH and SSB / PDCCH corresponding to RMSI can also be specified.

[0081] Additionally, the frequency / time resource restrictions / limitations in the DCI can also be applied only to the DCI corresponding to the RMSI (e.g., not to the DCI corresponding to the PDSCH in random access). Alternatively, the frequency / time resource restrictions / limitations in the DCI can also be applied to the DCI corresponding to the RMSI and the DCI corresponding to the PDSCH (message 2 / message 4) in random access.

[0082] <RACH>

[0083] During the initial access process, the frequency / time resources for RACH (PRACH) transmission can be limited by comparing the RACH of the existing system with the RACH of the initial access process (RACH after RRC connection).

[0084] 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, four PRBs can be set as one group, and resources can be allocated on a group basis.

[0085] Regarding the time resources for RACH, for example, the period of RACH opportunity (occasion) can also be limited (e.g., in equation (1), x = 16, y = 1). SFN It is the system frame rate.

[0086] n SFN mod x=y(1)

[0087] Furthermore, the number of subframes / slots can also be limited (e.g., number of subframes = 3, number of slots = 7). These limitations can also be used to reduce the amount of information in the PRACH configuration index (from 8 bits to 4 bits). A table representing the corresponding information for each of the limited pieces of information (PRACH configuration index, x, y, number of subframes / slots) can also be specified.

[0088] The RACH opportunity can also be uniquely specified. The parameters representing the start position (offset) of PRACH (message 1) in the frequency domain (msg1-FrequencyStart) and the configuration index of PRACH (prach-ConfigurationIndex) can also be uniquely specified. In this case, the preamble format can also be notified separately. The location of the time / frequency resources for the RACH opportunity can also be uniquely specified. For example, the relative position (number of slots / number of symbols / number of PRBs) between the RACH opportunity and SSB / PDCCH can also be specified.

[0089] <PUSCH>

[0090] During the initial access process, the frequency / time resources of the PUSCH (Message 3 PUSCH) set by DCI can also be limited by comparing with the existing system's PUSCH and the PUSCH outside the initial access (PUSCH after RRC connection).

[0091] Regarding frequency resources for PUSCH, FDRA can also be defined. For example, the starting position of the PUSCH (starting PRB) and at least one of the PRB numbers can be defined to specific values. Alternatively, the PRB grouping (RBG) can also be specified. For example, four PRBs can be grouped together and resources can be allocated on a group basis. These limitations can reduce the amount of information in the DCI's FDRA field.

[0092] Regarding the time resources of the PUSCH, the TDRA of the DCI can also be defined. For example, the mapping type (PUSCH mapping type) can also be defined (e.g., Type A). The offset (K2) between the DCI and the PUSCH scheduled via the DCI can also be defined (e.g., j). j is a parameter corresponding to the subcarrier spacing. Alternatively, it can be in μ PUSCH When j = 0 or 1 (subcarrier spacing = 15 or 30 kHz), j = 1 is set, in μ PUSCH With a subcarrier spacing of 60kHz and a subcarrier interval of 2, j=2 is set, and in μ PUSCH When the subcarrier spacing is 120kHz, j=3 is set.

[0093] The parameter (S) indicating the start position of the PUSCH (start PRB) and the parameter (L) indicating the number of consecutive symbols in the PUSCH can also be limited (e.g., S = 2, L = 12). A table related to the TDRA of the limited PUSCH can also be specified in the specification. This allows for the reduction of the information content of the RAR (the TDRA field of the DCI) (e.g., from 27 bits to 17 bits).

[0094] The time / frequency resources (location / range of time / frequency resources) of PUSCH (message 3PUSCH) can also be uniquely specified. In this case, the FDRA / TDRA of DCI can also be omitted. Furthermore, a new DCI format with FDRA / TDRA omitted can also be specified. For example, the relative positions (number of slots / number of symbols / number of PRBs) of PUSCH and SSB / PRACH / RAR can also be specified.

[0095] Based on the examples described above, the payload size associated with the initial access settings can be reduced, thereby improving communication connectivity at the regional (cell) level, the availability of IoT / functionally limited terminals, and enabling enhanced coverage and ultra-long-distance communication.

[0096] (Wireless Communication System)

[0097] The structure of a wireless communication system according to one embodiment of this disclosure will now be described. 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.

[0098] Figure 5 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).

[0099] 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.

[0100] 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.

[0101] 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))).

[0102] 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.

[0103] 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).

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0109] 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.

[0110] 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.

[0111] In the wireless communication system 1, the downlink channel can also be a shared downlink channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), or a downlink control channel (Physical Downlink Control Channel (PDCCH)) shared by each user terminal 20.

[0112] In addition, in the wireless communication system 1, the uplink channel can also be an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), or a random access channel (Physical Random Access Channel (PRACH)) shared by each user terminal 20.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] Furthermore, in this disclosure, downlink, uplink, etc., may be described without the word "link". Additionally, various channels may be described without the word "physical".

[0120] 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.

[0121] 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.

[0122] 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).

[0123] (Base station)

[0124] Figure 6This 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] Additionally, during the initial access process, the transmitting / receiving unit 120 may also transmit at least a portion of downlink signals with defined parameters. The downlink signals may also include a Synchronization Signal Block (SSB), and at least one of the following may be defined: the transmission period of the SSB, the synchronization grid of the SSB, the structure of the SSB, and the Physical Downlink Control Channel (PDCCH) setting information within the main information block of the SSB. The downlink signals may also include a Physical Downlink Shared Channel (PDSCH), and at least one parameter related to the frequency resources and time resources of the PDSCH may be defined.

[0142] The control unit 110 may also control the reception of uplink signals with at least a subset of parameters defined during the initial access process. The uplink signals may also include a Random Access Channel (RACH) or a Physical Uplink Shared Channel (PUSCH), and parameters related to at least one of the frequency and time resources of the RACH or PUSCH may also be defined.

[0143] (User terminal)

[0144] Figure 7 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.

[0145] 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.

[0146] 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 art to which this disclosure pertains.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] Additionally, during the initial access process, the transmitting / receiving unit 220 may also receive at least a portion of downlink signals with defined parameters. The downlink signals may also include a Synchronization Signal Block (SSB), and at least one of the following may be defined: the SSB transmission period, the SSB synchronization grid, the SSB structure, and the Physical Downlink Control Channel (PDCCH) setting information within the SSB's main information block. The downlink signals may also include a Physical Downlink Shared Channel (PDSCH), and parameters related to at least one of the frequency and time resources of the PDSCH may also be defined.

[0162] During the initial access process, the control unit 210 can also control the transmission of uplink signals with at least a portion of parameters defined. The uplink signals may also include a Random Access Channel (RACH) or a Physical Uplink Shared Channel (PUSCH), and parameters related to at least one of the frequency and time resources of the RACH or PUSCH may also be defined.

[0163] (Hardware Structure)

[0164] 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.

[0165] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, choosing, establishing, 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.

[0166] 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 8 This is a diagram illustrating 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] Storage device 1003 may also be a computer-readable recording medium, such as comprising at least one of the following: flexible disc, floppy disk, optical disk (e.g., compact disc ROM, CD-ROM, etc.), digital multifunction disk, Blu-ray disc, removable disk, hard disk, 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.

[0174] 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).

[0175] 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).

[0176] 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.

[0177] 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.

[0178] (Modified Example)

[0179] 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.

[0180] 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).

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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".

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] Input and output information, signals, etc., can be stored in a specific location (e.g., memory) or managed using a management table. 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.

[0204] 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.

[0205] 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).

[0206] 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).

[0207] 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).

[0208] 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.

[0209] 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.

[0210] 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).

[0211] 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.

[0212] 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.

[0213] 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.

[0214] In this disclosure, the terms “Mobile Station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” are used interchangeably.

[0215] 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.

[0216] 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.

[0217] 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 a structure where the 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.

[0218] 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.

[0219] In this disclosure, actions purported to be performed by the base station are sometimes also performed by its upper node, depending on the circumstances. Clearly, in a network containing one or more network nodes having a base station, various operations performed 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.

[0220] 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.

[0221] 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.

[0222] 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".

[0223] The term "determining" as used in this disclosure can encompass a wide variety of actions. 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.

[0224] 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.

[0225] 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.

[0226] In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0227] 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."

[0228] 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.

[0229] 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."

[0230] 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.

[0231] 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.

[0232] 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, receives downlink signals with at least a portion of their parameters defined; and The control unit, during the initial access process, controls the transmission of uplink signals for which at least a portion of the parameters are defined. The uplink signal includes a random access channel (RACH) or a physical uplink shared channel (PUSCH), parameters related to at least one of the frequency and time resources of the RACH during the initial access process, which are defined by comparison with a RACH outside the initial access process, or parameters related to at least one of the frequency and time resources of the PUSCH during the initial access process, which are defined by comparison with a PUSCH outside the initial access process.

2. The terminal as described in claim 1, wherein, The downlink signal includes a synchronization signal block (SSB), and at least one of the following is defined: the transmission period of the SSB, the synchronization grid of the SSB, the structure of the SSB, and the physical downlink control channel (PDCCH) setting information within the main information block of the SSB.

3. The terminal as described in claim 1 or 2, wherein, The downlink signal includes a Physical Downlink Shared Channel (PDSCH), and at least one parameter associated with the frequency and time resources of the PDSCH is defined.

4. A wireless communication method for a terminal, comprising: During the initial access process, the step of receiving downlink signals with at least some parameters defined; and During the initial access process, the step of controlling the transmission of uplink signals with at least a portion of parameters defined is... The uplink signal includes a random access channel (RACH) or a physical uplink shared channel (PUSCH), parameters related to at least one of the frequency and time resources of the RACH during the initial access process, which are defined by comparison with a RACH outside the initial access process, or parameters related to at least one of the frequency and time resources of the PUSCH during the initial access process, which are defined by comparison with a PUSCH outside the initial access process.

5. A base station, comprising: The transmitting unit, during the initial access process, transmits downlink signals with at least a portion of its parameters defined; and The control unit, during the initial access process, controls the reception of uplink signals for which at least a portion of the parameters are defined. The uplink signal includes a random access channel (RACH) or a physical uplink shared channel (PUSCH), parameters related to at least one of the frequency and time resources of the RACH during the initial access process, which are defined by comparison with a RACH outside the initial access process, or parameters related to at least one of the frequency and time resources of the PUSCH during the initial access process, which are defined by comparison with a PUSCH outside the initial access process.

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