Terminal, wireless communication method and base station

Abstract

A terminal according to one aspect of the present disclosure has: a control unit that controls at least one operation from among transmission of downlink data and transmission of uplink data, in a state in which the terminal is idle or inactive; and a transceiver that performs the operation without having transmitted a random access preamble in the aforementioned state prior to the operation. According to one aspect of the present disclosure, it is possible to reduce electric power consumption / delay.

Description

[Technical field]

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. [Background technology]

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of achieving higher capacity and greater sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

[0004] In existing LTE systems (e.g., 3GPP Rel. 8-14), a user equipment (User Equipment (UE)) transmits uplink control information (Uplink Control Information (UCI)) using at least one of an UL data channel (e.g., a Physical Uplink Shared Channel (PUSCH)) and an UL control channel (e.g., a Physical Uplink Control Channel (PUCCH)). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0006] In future wireless communication systems (e.g., NR), reduction in power consumption / delay is being considered.

[0007] However, it is not clear how a terminal in idle / inactive mode operates to reduce power consumption / latency. If the operation of the idle / inactive mode is not clear, it may hinder the reduction of power consumption / latency.

[0008] Therefore, an object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that reduce power consumption / delay. [Means for solving the problem]

[0009] A terminal according to one embodiment of the present disclosure includes a control unit that controls at least one operation of receiving downlink data and transmitting uplink data in either an idle state or an inactive state, and a transceiver unit that performs the operation without transmitting a random access preamble in the state before the operation. When the control unit receives the downlink data, the control unit controls transmission of an uplink signal corresponding to an acknowledgement (ACK) for the downlink data, and the control unit uses a part or all of the specific resources to be set for transmitting the uplink data and uses a part or all of the specific resources for transmitting the uplink signal. . Effect of the Invention

[0010] According to one aspect of the present disclosure, power consumption / delay can be reduced. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of UL data transmission according to the first embodiment. [Diagram 2] FIG. 2 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Diagram 3] FIG. 3 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 4] FIG. 4 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Diagram 5] FIG. 5 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (traffic type / service) In future wireless communication systems (e.g., NR), traffic types (also referred to as services, service types, communication types, use cases, etc.) such as further advances in mobile broadband (e.g., enhanced Mobile Broadband (eMBB)), machine type communications that realize multiple simultaneous connections (e.g., massive Machine Type Communications (mMTC), Internet of Things (IoT)), and highly reliable and low latency communications (e.g., Ultra-Reliable and Low-Latency Communications (URLLC)) are expected. For example, URLLC requires smaller latency and higher reliability than eMBB.

[0013] Traffic types may be identified at the physical layer based on at least one of the following: ·Priority · Logical channels with different priorities Modulation and Coding Scheme (MCS) table (MCS index table) ·Channel Quality Indication (CQI) table DCI format Used to scramble (mask) the Cyclic Redundancy Check (CRC) bits included (added) in the DCI (DCI format) (Radio Network Temporary Identifier (RNTI: System Information-Radio Network Temporary Identifier)) RRC (Radio Resource Control) parameters A specific RNTI (e.g., RNTI for URLLC, MCS-C-RNTI, etc.) Search Space Fields in the DCI (e.g., newly added fields or reuse of existing fields, priority fields)

[0014] Specifically, the traffic type of the HARQ-ACK for the PDSCH may be determined based on at least one of the following: The MCS index table used to determine at least one of the modulation order, target code rate, and transport block size (TBS) of the PDSCH (e.g., whether to use MCS index table 3) The RNTI used for CRC scrambling of the DCI used for scheduling the PDSCH (e.g., whether CRC scrambling is performed using C-RNTI or MCS-C-RNTI)

[0015] The traffic type of the SR may also be determined based on a higher layer parameter used as an SR identifier (SR-ID), which may indicate whether the traffic type of the SR is eMBB or URLLC.

[0016] Furthermore, the traffic type of the CSI may be determined based on configuration information (CSIreportSetting) related to CSI reporting, a DCI type or a DCI transmission parameter used for a trigger, etc. The configuration information, DCI type, etc. may indicate whether the traffic type of the CSI is eMBB or URLLC. The configuration information may be an upper layer parameter.

[0017] In addition, the traffic type of the PUSCH may be determined based on at least one of the following: The MCS index table used to determine at least one of the modulation order, target coding rate, and TBS of the PUSCH (e.g., whether to use MCS index table 3) The RNTI used for CRC scrambling of the DCI used for scheduling the PUSCH (e.g., whether CRC scrambling is performed using C-RNTI or MCS-C-RNTI)

[0018] The traffic type may be associated with communication requirements (requirements such as delay, error rate, etc.), data type (voice, data, etc.), and the like.

[0019] The difference between the requirements of URLLC and eMBB may be that the latency of URLLC is smaller than that of eMBB, or that the requirements of URLLC include a reliability requirement.

[0020] For example, the eMBB user (U) plane delay requirement may include a downlink U-plane delay of 4 ms and an uplink U-plane delay of 4 ms. Meanwhile, the URLLC U-plane delay requirement may include a downlink U-plane delay of 0.5 ms and an uplink U-plane delay of 0.5 ms. Furthermore, the URLLC reliability requirement may include a 32-byte error rate of 10-5 at a U-plane delay of 1 ms.

[0021] In addition, enhanced Ultra Reliable and Low Latency Communications (eURLLC) is being studied to improve the reliability of traffic, mainly for unicast data. In the following, when there is no need to distinguish between URLLC and eURLLC, they will simply be referred to as URLLC.

[0022] In NR Rel.16 and later, it is being considered to set multiple levels (e.g., two levels) of priority for a specific signal or channel. For example, it is expected that different priorities will be set for signals or channels corresponding to different traffic types (also called services, service types, communication types, use cases, etc.) to control communications (e.g., transmission control in the event of a collision). This makes it possible to control communications by setting different priorities for the same signal or channel depending on the service type, etc.

[0023] The priority of URLLC may be higher than the priority of eMBB. The priority may be set to "high" (high priority, 1) for URLLC and "low" (low priority, 0) for eMBB.

[0024] The reduced functionality of the UE may be defined as a UE category / capability for Internet of Things (IoT). The UE category / capability may be, for example, enhanced machine type communication (eMTC) in LTE, narrow band (NB)-IoT, or reduced capability (RedCap) in NR. Use cases of such a UE may be an industry wireless sensor NW (IWSN), a video surveillance system, a wearable device, etc.

[0025] (UE state) In future wireless communication systems (hereinafter also referred to as NR), it is expected that terminals (also referred to as user terminals, user equipment (UE), devices, etc.) will have multiple states according to traffic activity.

[0026] For example, an NR UE may have three states in the Radio Resource Control (RRC) layer: an idle state, an inactive state, and a connected state, which are also referred to as UE states, RRC states, etc.

[0027] Here, the idle state is a state in which an RRC connection between a UE and a base station is not established, and is also called an RRC idle state (RRC_IDLE state), RRC idle (RRC_IDLE), etc. In order for a UE in the idle state to transition to a connected state in which data transfer is possible, a reconfiguration of the RRC connection is required.

[0028] The inactive state is a state in which an RRC connection between the UE and the base station is established but data transmission is not possible, and is also called the RRC_INACTIVE state or RRC_INACTIVE. Since an RRC connection is established for a UE in the inactive state, it can transition to the connected state earlier than in the idle state. Therefore, the delay time until data transmission begins is shorter than for a UE in the idle state.

[0029] The connected state is a state in which an RRC connection between the UE and the base station is established and data transmission is possible, and is also called an RRC_CONNECTED state, RRC_CONNECTED, etc. A UE in the connected state monitors a downlink control channel (e.g., a Physical Downlink Control Channel (PDCCH)) to determine whether data is scheduled, and therefore consumes more power than a UE in an idle state or an inactive state.

[0030] (paging) In LTE, system information change notification using paging information (Paging message) is supported for user terminals in the RRC connected state (RRC_CONNECTED) and user terminals in the RRC idle state (RRC_IDLE). System information change notification using paging information (Paging message) is also supported in NR. In NR, system information change notification using paging information (Paging message) can be performed for user terminals in the RRC connected state (RRC_CONNECTED), user terminals in the RRC idle state (RRC_IDLE), and user terminals in the RRC inactive state (RRC_INACTIVE).

[0031] In NR, a UE in an RRC idle state or an RRC inactive state (RRC_INACTIVE) performs discontinuous reception (DRX) at a predetermined period in order to reduce power consumption. The UE monitors one paging occasion (PO) per DRX cycle.

[0032] Here, a PO is a set of monitoring occasions (monitoring periods, PDCCH monitoring opportunities) of a downlink control channel (e.g., PDCCH). A PO may be configured with one or more time domain resource units (e.g., one or more slots, one or more subframes, one or more symbols).

[0033] In the PO, downlink control information (DCI) (DCI for paging, paging DCI, DCI format 1_0) for scheduling a downlink shared channel (e.g., PDSCH) for transmitting a paging message is transmitted. The paging DCI may have Cyclic Redundancy Check (CRC) bits scrambled with a predetermined Paging-Radio Network Temporary Identifier (P-RNTI). When a user terminal detects downlink control information in which the CRC is scrambled with the P-RNTI, the user terminal can determine that the downlink control information is paging DCI for scheduling a PDSCH for transmitting a paging message.

[0034] A Paging Frame (PF) is a radio frame that may contain one or more POs. A PF may also be the starting point of a PO. Each radio frame may be identified by a System Frame Number (SFN).

[0035] In the RRC connected state (RRC_CONNECTED), if a UE is provided with a common search space (paging search space) for monitoring paging, the UE monitors the paging DCI at least in one PO during a system information change period.

[0036] The UE receives an indication of at least one of a system information change and a Public Warning System (PWS) notification based on the short message transmitted by the paging DCI.

[0037] System information may include Earthquake and Tsunami Warning System (ETWS), Commercial Mobile Alert Service (CMAS), Extended Access Barring (EAB), etc.

[0038] In LTE, SIB10 (System Information Block Type 10) includes a primary notification (short notification) of ETWS, and SIB11 (System Information Block Type 11) includes a secondary notification (detailed information) of ETWS.

[0039] In the NR, SIB6 contains the main notification of the ETWS and SIB7 contains the secondary notification of the ETWS.

[0040] (problem) For future wireless communication systems (for example, Beyond 5G and 6G), further improvements in communication performance and diversification of use cases are being considered.

[0041] In existing NR, when a terminal in idle mode (e.g., UE) transmits / receives data, it needs to transition to connected mode by performing a random access procedure, etc., to transmit / receive data, which results in high power consumption / delay.

[0042] Therefore, the present inventors came up with the idea of ​​a method for transmitting / receiving data from an idle / inactive mode.

[0043] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0044] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, frequency carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read as interchangeable. In the present disclosure, index, ID, indicator, resource ID may be read as interchangeable. In the present disclosure, support, control, can be controlled, operate, can operate may be read as interchangeable.

[0045] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read as interchangeable.

[0046] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), and RRC messages may be read as interchangeable.

[0047] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0048] (Wireless communication method) <First embodiment> The terminal may transmit UL data (PUSCH) without a specific procedure (without performing a specific procedure) in a state equivalent to the idle / inactive mode. The specific procedure may be a random access procedure or may be transmission of a random access preamble (PRACH). In a state equivalent to the idle / inactive mode, the terminal may not need to perform a specific procedure before transmitting UL data (PUSCH).

[0049] The terminal may transmit UL data before transmitting the random access preamble in a state corresponding to the idle / inactive mode. The specific procedure may transmit UL data before transmitting the random access preamble within the random access procedure.

[0050] The terminal may determine whether to transmit UL data without a specific procedure based on a specific parameter, which may be at least one of DL synchronization deviation (time, measured value of DL synchronization deviation), UL synchronization deviation (time / degree, estimated value of UL synchronization deviation), moving distance of the terminal, measurement result, elapsed time, and terminal type / capability.

[0051] <<Aspect 1-1>> The specific parameter may be DL synchronization deviation. The terminal may determine whether to transmit UL data without a specific procedure based on the DL synchronization deviation.

[0052] When the DL synchronization is large, there is a risk that the terminal cannot receive the DL signal, that the interference received by the DL signal or that caused by the DL signal becomes large, and that the demodulation performance is degraded.

[0053] The terminal may receive a specific DL signal and detect DL synchronization loss based on the specific DL signal. The specific DL signal may be a reference signal, a synchronization signal, an SS / PBCH block, etc.

[0054] The terminal may estimate the degree of UL synchronization deviation based on the DL synchronization deviation. The terminal may determine whether to transmit UL data without a specific procedure based on the estimated degree of UL synchronization deviation.

[0055] The terminal may determine whether to transmit UL data without a specific procedure based on DL synchronization deviation from a specific point in time (opportunity, timing, trigger). The specific point in time may be at least one of the following points in time 1 to 3. [Time 1] Last UL transmission [Point 2] The point at which the synchronization status can no longer be maintained (for example, in connected mode) [Point 3] Other points / actions / state transitions

[0056] The magnitude (threshold) of DL synchronization deviation that allows UL data (PUSCH) to be transmitted without a specific procedure may be notified / configured or may be specified in the specification. The threshold may be a CP length. If the magnitude of DL synchronization deviation is equal to or less than the threshold, in a state equivalent to an idle / inactive mode, the terminal may transmit UL data (PUSCH) without a specific procedure.

[0057] In the example of Fig. 1, after an operation at a specific time point (S10), the terminal transitions to an idle / inactive mode (S20). Thereafter, when UL data is generated in the terminal (S30), the terminal determines whether or not the magnitude of DL synchronization deviation from the specific time point is equal to or smaller than a threshold (S40). If the magnitude of DL synchronization deviation is equal to or smaller than the threshold (S40: Y), the terminal transmits UL data (PUSCH) without transmitting a random access preamble (S50). If the magnitude of DL synchronization deviation is not equal to or smaller than the threshold (S40: N), the terminal transmits a random access preamble, establishes UL synchronization, and then transmits UL data (PUSCH) (S60).

[0058] In this PUSCH transmission, the terminal may use the timing advance (TA) that it holds.

[0059] In the present disclosure, the TA held by the terminal may be a TA notified by higher layer signaling before transition to the idle / inactive mode. The higher layer signaling may be a random access response (RAR) or a MAC CE.

[0060] <<Aspect 1-2>> The specific parameter may be a moving distance / measurement result / elapsed time of the terminal. The terminal may determine whether to transmit UL data without a specific procedure based on the moving distance / measurement result / elapsed time.

[0061] The terminal may receive a specific DL signal and calculate a measurement result based on the specific DL signal. The specific DL signal may be a reference signal, a synchronization signal, an SS / PBCH block, etc.

[0062] The terminal may determine whether to transmit UL data without a specific procedure based on a moving distance / measurement result / elapsed time from a specific point in time (opportunity, timing). The specific point in time may be at least one of the following points in time 1 to 3. [Time 1] Last UL transmission [Point 2] The point at which the synchronization status can no longer be maintained (for example, in connected mode) [Point 3] Other points / actions / state transitions

[0063] The size (threshold) of a specific parameter that allows UL data (PUSCH) to be transmitted without a specific procedure may be notified / configured or may be specified in a specification. The threshold may be a CP length. If the size of the specific parameter is equal to or less than the threshold, the terminal may transmit UL data (PUSCH) without a specific procedure in a state equivalent to an idle / inactive mode.

[0064] The terminal may measure / detect / calculate its own moving distance. The terminal may have a sensor / positioning device (global positioning system (GPS)) for measuring its own position / moving distance, or the terminal or a base station may perform positioning of the terminal based on transmission / reception of signals. The terminal may calculate the moving distance based on this positioning result.

[0065] The measurement result may be at least one of signal strength, quality, RSRP, RSRQ, and SINR. The terminal may calculate the measurement result by receiving a DL signal.

[0066] The elapsed time may be represented by a timer, the length of which may be announced / set or specified in the specification.

[0067] In this PUSCH transmission, the terminal may use the TA that it holds.

[0068] <<Aspect 1-3>> The cyclic prefix (CP) / guard period (GP) for the PUSCH may be variable. The CP / GP for the PUSCH may be signaled / configured or specified. A special (dedicated) CP / GP for PUSCH transmission without specific procedures (idle / inactive mode) may be signaled / configured or specified. The CP may indicate the period immediately before the PUSCH (first symbol of the PUSCH). The GP may indicate the period immediately after the PUSCH (last symbol of the PUSCH) or the period between PUSCH occasions.

[0069] For example, the CP / GP for a PUSCH transmission without a specific procedure (in idle / inactive mode) may be longer than the CP / GP for a PUSCH transmission with a specific procedure (in connected mode). By using a long CP / GP for a PUSCH transmission without a specific procedure, errors / interference in the PUSCH transmission can be prevented.

[0070] The TA used for this PUSCH transmission may be 0 or a value held by the terminal. Alternatively, the TA used for this PUSCH transmission may be a value obtained by correcting the TA value held by the terminal or 0 based on a specific parameter (such as DL synchronization deviation). The TA here may be a value to which an offset related to the TA has been added, or a value to which no offset related to the TA has been added. The offset related to the TA may be an offset notified by higher layer signaling before transition to the idle / inactive mode. The higher layer signaling may be N_TA-Offset applied to all UL transmissions other than this PUSCH transmission in the serving cell. The offset may be defined for the duplex mode and frequency range of the serving cell.

[0071] The terminal may determine whether to transmit UL data without a specific procedure based on a specific parameter.

[0072] The terminal may determine the length of the CP / GP based on a specific parameter from a specific point in time (opportunity, timing). The specific parameter may be at least one of DL synchronization offset (time), UL synchronization offset, a moving distance of the terminal, a measurement result, an elapsed time, and a cell radius. The specific point in time may be at least one of the following points 1 to 3. [Time 1] Last UL transmission [Point 2] The point at which the synchronization status can no longer be maintained (for example, in connected mode) [Point 3] Other points / actions / state transitions

[0073] The relationship between the specific parameter and the length of the CP / GP may be specified or may be signaled / set in the specification, for example, the relationship may be such that the larger the size of the specific parameter, the longer the length of the CP / GP.

[0074] A CP / GP assuming a maximum propagation delay may be signaled / configured or may be specified in a specification. The maximum propagation delay may be based on a cell radius. The cell radius may be the size of a cell in which the terminal is located. For example, the length of the CP / GP for a PUSCH without a specific procedure may be the same as the length of the CP / GP for a preamble. The length of the CP / GP for a preamble may be based on a maximum propagation delay. The length of the CP / GP for a preamble (e.g., N_CP^RA) may be associated with a preamble format / PRACH configuration. The length of the CP / GP corresponding to the configured preamble format / PRACH configuration may be determined.

[0075] <<Aspect 1-4>> The specific parameter may be a type / capability of the terminal. The terminal may determine whether to transmit UL data without a specific procedure based on the type / capability of the terminal. The type / capability of the terminal may be determined based on at least one of a UE class (e.g., power class), a UE capability, a UE category, a service, a traffic type, and a priority.

[0076] If the terminal has a specific type / capability, the terminal may transmit UL data without a specific procedure. The specific type / capability may be at least one of a fixed UE, an IoT-related terminal, a sensor-related terminal, a terminal with a lower transmission power compared to other types of terminals, a RedCap terminal, and an MTC. A fixed UE may be a terminal whose location is expected to be fixed.

[0077] Aspects 1-5 Two or more of the aspects 1-1 to 1-4 may be combined.

[0078] According to this embodiment, a terminal in idle / inactive mode can properly transmit UL data without any specific procedures.

[0079] <Second embodiment> The terminal may receive DL data without a specific procedure in a state corresponding to an idle / inactive mode. The terminal may not need to perform a specific procedure before receiving DL data in a state corresponding to an idle / inactive mode. The specific procedure may be a random access procedure or may be transmission of a random access preamble (PRACH).

[0080] The terminal may receive DL data before transmitting the random access preamble in a state corresponding to the idle / inactive mode. The specific procedure may receive DL data before transmitting the random access preamble in the random access procedure.

[0081] <<Aspect 2-1>> Base station (area) that transmits DL data

[0082] A specific ID that can uniquely identify a terminal (UE) may be set for each base station (area) that transmits DL data. The terminal may be able to recognize the specific ID when receiving DL data or when receiving scheduling information for DL ​​data. For example, the specific ID may be included in the DL data or the scheduling information for DL ​​data. Scrambling based on the specific ID may be performed on the DL data or the scheduling information for DL ​​data.

[0083] The specific ID that can uniquely identify a terminal (UE) in units of base stations (areas) that transmit DL data may be based on an ID possessed by the terminal. The terminal may be able to recognize the specific ID when receiving DL data or when receiving scheduling information for DL ​​data. For example, the specific ID may be included in the DL data or the scheduling information for DL ​​data. Scrambling based on the specific ID may be performed on the DL data or the scheduling information for DL ​​data.

[0084] [Aspect 2-1-1] One or more base stations in the range where the terminal is expected to be located (for example, all base stations, ranges where the terminal is expected to be located) may transmit DL data. The range (area) of a base station that transmits DL data to a certain terminal may be the same (equivalent) as the range (area) of a base station that transmits paging to the terminal. DL data may have a size limited to a certain size or less, or may be broadcast data.

[0085] [Aspect 2-1-2] The terminal may notify / report / send information / signals about its location / location to the network (NW). The NW may determine the base station to transmit DL data based on the information. The base station may transmit the DL data.

[0086] [[Aspect 2-1-2-1]] When the information about the location / position of the terminal is changed, the terminal may notify / report the information about the change to the base station. The information about the location / position of the terminal may indicate the cell (serving cell) in which the terminal is located (existing), etc.

[0087] [[Aspect 2-1-2-2]] The terminal may (implicitly) report information about its location / location by transmitting a specific UL signal. The specific UL signal may be a reference signal or a preamble. The terminal may periodically transmit the specific UL signal. The NW may determine a base station to transmit DL data to based on reception of the specific UL signal.

[0088] [Aspect 2-1-3] The terminal may determine one or more base stations based on the result of its positioning, and may receive DL data from the one or more base stations.

[0089] "Aspect 2-2" ACK for DL ​​data

[0090] [Aspect 2-2-1] The terminal may transmit a specific preamble as an ACK for DL ​​data. The specific preamble may be associated with a UE ID (a UE-specific ID) or may be associated with a specific ID of aspect 2-1. The UE ID may be a UE ID or a radio network temporary identifier (RNTI) (e.g., C-RNTI). In transmitting the specific preamble, UL synchronization may not be established and TA may not be used. When the NW receives the specific preamble, the NW may regard the preamble as an ACK.

[0091] [Aspect 2-2-2] The terminal may transmit a specific UL signal as an ACK for DL ​​data. The length of the CP / GP in the specific UL signal may be a special value. TA may not be applied to the specific UL signal. The specific UL signal may be a reference signal or a PUCCH. The specific UL signal may be associated with a UE ID. The UE ID may be a UE ID or an RNTI (e.g., C-RNTI).

[0092] [Aspect 2-2-3] The terminal may apply at least one of the aspects 1-1 to 1-5 in the first embodiment to the ACK for the DL data. The terminal may transmit the ACK instead of the UL data in the first embodiment. The UL data in the first embodiment may mean the ACK.

[0093] According to this embodiment, a terminal in idle / inactive mode can receive DL data without any specific procedure.

[0094] <Third embodiment> The first and second embodiments may be combined.

[0095] A transmission resource (common resource, specific resource) common to the PUSCH in the first embodiment and the ACK in the second embodiment may be notified / configured or may be defined in the specifications.

[0096] A part or all of the common resources may be used as a PUSCH transmission resource in UL data transmission. A part or all of the common resources may be used as an ACK transmission resource in ACK transmission based on DL data reception. The ACK may be according to the second embodiment, or may be any of a preamble, a PUCCH, and an RS. Among the common resources, the PUSCH transmission resource and the ACK transmission resource may be different.

[0097] The common resources may be configured as UE-specific resources or as cell-specific resources.

[0098] If the terminal attempts to transmit the PUSCH and the ACK at the same time (the PUSCH and the ACK collide), the terminal may follow at least one of the following transmission methods 1 and 2.

[0099] [Transmission method 1] The terminal may transmit a PUSCH and include information equivalent to an ACK in the PUSCH.

[0100] [Transmission method 2] The priority of PUSCH transmission and ACK transmission may be defined in the specifications or may be signaled / configured.

[0101] Regarding the amount of time / frequency resources used for actual transmission within the common resources, the amount of resources for PUSCH and the amount of resources for ACK may be different.

[0102] According to this embodiment, it is not necessary to separately notify / configure resources for PUSCH transmission without a specific procedure and resources for ACK transmission without a specific procedure, so that notification overhead can be reduced.

[0103] <Other embodiments> A higher layer parameter (RRC IE) / UE capability corresponding to the function (feature) in each of the above embodiments may be defined. The UE capability may indicate that the function is supported.

[0104] A UE in which a higher layer parameter corresponding to the function (enabling the function) is configured may perform the function. It may be specified that "a UE in which a higher layer parameter corresponding to the function is not configured shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0105] A UE that reports a UE capability indicating that it supports the function may perform the function. It may be specified that "a UE that does not report a UE capability indicating that it supports the function shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0106] If the UE reports a UE capability indicating that the UE supports the function and a corresponding higher layer parameter is configured, the UE may perform the function. It may also be specified that "if the UE does not report a UE capability indicating that the UE supports the function or if a corresponding higher layer parameter is not configured, the UE shall not perform the function (e.g., in accordance with Rel.15 / 16)."

[0107] The UE capability may indicate whether the UE supports the feature.

[0108] The UE capability may indicate whether the UE supports transmitting UL data without a specific procedure. The UE capability may indicate whether the UE supports receiving DL data without a specific procedure. The UE capability may indicate whether the UE supports transmitting an ACK for DL ​​data without a specific procedure.

[0109] The UE capability may indicate whether a feature is supported per frequency range (FR) / band / duplex mode.

[0110] The higher layer parameters / UE capabilities allow the UE to achieve the above functions while maintaining compatibility with existing specifications.

[0111] In the present disclosure, X mode, RRC_X, and X state may be interchangeable. Here, X may be at least one of idle, inactive, and connected. In the present disclosure, idle / inactive mode, a state equivalent to idle / inactive mode, and a state other than connected mode may be interchangeable.

[0112] In the present disclosure, the terms terminal, UE, node, and device may be interchangeable.

[0113] In the present disclosure, the terms "serving cell", "camp on" and "registered" may be interchangeable. In the present disclosure, the terms "serving cell", "serving cell" and "coverage" may be interchangeable.

[0114] In the present disclosure, the terms preamble, random access preamble, PRACH preamble, preamble index, root sequence, cyclic shift, RACH occasion, and RACH resource may be interchangeable.

[0115] (Wireless communication systems) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0116] 2 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by Third Generation Partnership Project (3GPP).

[0117] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may 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)), and the like.

[0118] 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.

[0119] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0120] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0121] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0122] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0123] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0124] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0125] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0126] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0127] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0128] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0129] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0130] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0131] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0132] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0133] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0134] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0135] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0136] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0137] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0138] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0139] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0140] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0141] (base station) 3 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0142] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0143] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0144] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0145] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0146] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0147] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0148] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0149] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0150] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0151] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0152] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0153] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0154] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0155] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may 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 may be output to the control unit 110.

[0156] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0157] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0158] The transceiver 120 may receive signals (eg, measurement results, determination results, destination ID, source ID) for determining a plurality of terminals (eg, a UE group) that share uplink data.

[0159] Based on the signal, the control unit 110 may control (e.g., configure, instruct, schedule) a first terminal of the plurality of terminals to either receive the uplink data from a second terminal of the plurality of terminals or transmit the uplink data to the second terminal.

[0160] The control unit 110 may control at least one of the operations of transmitting downlink data and receiving uplink data for a terminal having either an idle state or an inactive state.

[0161] The transceiver 120 may perform the operation without receiving a random access preamble from the terminal having the state prior to the operation.

[0162] (User terminal) 4 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0163] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0164] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0165] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0166] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0167] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0168] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0169] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0170] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0171] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0172] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0173] In addition, whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0174] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0175] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0176] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0177] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0178] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0179] The control unit 210 may control at least one of the operations of receiving downlink data and transmitting uplink data in either the idle or inactive state.

[0180] The transceiver unit 220 may perform the operation without transmitting a random access preamble in the state prior to the operation.

[0181] The control unit 210 may determine whether to transmit the random access preamble before transmitting the uplink data in the state based on at least one parameter of a synchronization deviation time of a downlink signal, a moving distance of the terminal, a measurement result by the terminal, an elapsed time, a type of the terminal, and a capability of the terminal.

[0182] When the control unit 210 receives the downlink data, the control unit 210 may control transmission of an uplink signal corresponding to an acknowledgement (ACK) for the downlink data.

[0183] Specific resources may be set. The control unit 210 may use a part or all of the specific resources for transmitting the uplink data, and may use a part or all of the specific resources for transmitting the uplink signal.

[0184] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0185] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0186] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 5 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0187] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0188] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0189] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0190] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0191] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0192] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0193] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0194] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0195] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0196] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0197] Furthermore, the base station 10 and the user terminal 20 may 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), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0198] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0199] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0200] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0201] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0202] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0203] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0204] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0205] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0206] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0207] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0208] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0209] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0210] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0211] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0212] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0213] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0214] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0215] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0216] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0217] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0218] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0219] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0220] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0221] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0222] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0223] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0224] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0225] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0226] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0227] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0228] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0229] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0230] In this disclosure, terms such as "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," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0231] In this disclosure, terms such as "Base Station (BS)", "radio 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", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0232] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0233] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0234] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0235] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0236] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be read as a sidelink channel.

[0237] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0238] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0239] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0240] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including 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 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0241] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0242] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0243] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0244] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0245] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0246] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0247] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0248] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0249] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0250] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0251] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0252] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0253] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. a control unit that controls at least one of an operation of receiving downlink data and an operation of transmitting uplink data in either an idle state or an inactive state; a transceiver unit that performs the operation without transmitting a random access preamble in the state before the operation, When the control unit receives the downlink data, the control unit controls transmission of an uplink signal corresponding to an acknowledgement (ACK) for the downlink data; The control unit uses a part or all of the set specific resources for transmitting the uplink data, and uses a part or all of the set specific resources for transmitting the uplink signal.

2. 2. The terminal according to claim 1, wherein the control unit determines whether to transmit the random access preamble before transmitting the uplink data in the state based on at least one parameter of a synchronization deviation time of a downlink signal, a moving distance of the terminal, a result of measurement by the terminal, an elapsed time, a type of the terminal, and a capability of the terminal.

3. controlling at least one of an operation of receiving downlink data and transmitting uplink data in either an idle state or an inactive state; performing said operation without transmitting a random access preamble in said state prior to said operation; When the downlink data is received, controlling transmission of an uplink signal corresponding to an acknowledgement (ACK) for the downlink data; using a part or all of the specific resources to be set for transmitting the uplink data; using a part or all of the specific resources for transmitting the uplink signal; A wireless communication method for a terminal comprising:

4. A control unit that controls at least one of an operation of transmitting downlink data and receiving uplink data for a terminal having either an idle state or an inactive state; A transceiver unit that performs the operation without receiving a random access preamble from the terminal having the state before the operation, When the control unit transmits the downlink data, the control unit controls reception of an uplink signal corresponding to an acknowledgement (ACK) for the downlink data; The control unit uses a part or all of specific resources set in the terminal for receiving the uplink data, and uses a part or all of the specific resources for receiving the uplink signal.

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