Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes a reception unit that receives information related to a channel occupancy time (COT) in a semi-static channel access procedure, and a control unit that controls dominance of the COT based on the information related to the COT. According to one embodiment of the present disclosure, it is possible to appropriately control wireless communication in an NR-U system. According to one embodiment of the present disclosure, it is possible to appropriately control wireless communication in an NR-U system.

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 Art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized to achieve even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) has been standardized to further enhance the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).

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

[0004] Prior art literature

[0005] Non-patent literature

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

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., also known as 5G, 5G+, New Radio (NR), 3GPP Rel.16 and later), the use of unlicensed bands (also referred to as NR-Unlicensed (U) systems) is being studied, similar to existing wireless communication systems (e.g., before 3GPP Rel.15).

[0009] In addition, research is underway to introduce downlink control information (DCI) formats (e.g., DCI formats 0_2, 1_2) for services such as high-reliability and low-latency communications (e.g., Ultra-Reliable and Low-Latency Communications (URLLC)) in future wireless communication systems (e.g., also known as 5G, 5G+, New Radio (NR), 3GPP Rel.16 and later, etc.).

[0010] However, in uplink communications in services such as URLLC, there is insufficient research on the channel occupancy time (COT) for FBE (frame-based equipment) and UE-initiated user equipment (UE).

[0011] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control wireless communication in an NR-U system.

[0012] Means for solving problems

[0013] A terminal according to one embodiment of the present disclosure is characterized by comprising: a receiving unit for receiving information related to a channel occupancy time (COT) in a semi-static channel access process; and a control unit for controlling the dominance of the COT based on the information related to the COT.

[0014] Effects of the Invention

[0015] According to one embodiment of the present disclosure, wireless communications in the NR-U system can be appropriately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing an example of COT in Rel. 16, which is performed by a base station.

[0017] Figure 2This is a diagram showing an example of UE-led COT.

[0018] Figure 3 This is a diagram showing another example of UE-led COT.

[0019] Figure 4 This is a diagram showing another example of UE-led COT.

[0020] Figure 5 This is a diagram showing another example of UE-led COT.

[0021] Figure 6 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

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

[0023] Figure 8 This is a diagram showing an example of the configuration of a user terminal according to an embodiment.

[0024] Figure 9 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. DETAILED DESCRIPTION

[0025] (Service(Business Type))

[0026] Future wireless communication systems (e.g., NR) envision further improving mobile broadband (e.g., enhanced mobile broadband (eMBB)), machine-type communications that enable multiple simultaneous connections (e.g., massive machine-type communications (mMTC) and the Internet of Things (IoT)), and highly reliable and low-latency communications (e.g., ultra-reliable and low-latency communications (URLLC)). These types of services (also referred to as types, services, service types, communication types, use cases, and the like) are envisioned. For example, URLLC requires lower latency and higher reliability than eMBB.

[0027] The traffic type may also be identified in the physical layer based on at least one of the following.

[0028] Logical channels with different priorities

[0029] • Modulation and Coding Scheme (MCS) table (MCS index table)

[0030] • Channel Quality Indication (CQI) table

[0031] • DCI format

[0032] • Used in scrambling (masking) of cyclic redundancy check (CRC) bits included (appended) in the DCI (DCI format) (Radio Network Temporary Identifier (System Information-Radio Network Temporary Identifier (RNTI))

[0033] • RRC (Radio Resource Control) parameter

[0034] • Specific RNTI (e.g., RNTI for URLLC, MCS-C-RNTI, etc.)

[0035] • Search space

[0036] • Specific field within the DCI (e.g., newly added field or reuse of existing field)

[0037] Specifically, the service type for HARQ-ACK (or PUCCH) for the PDSCH can also be decided based on at least one of the following.

[0038] • MCS index table used in the decision of at least one of the modulation order, target code rate, transport block size (TBS) of the PDSCH (e.g., whether to use MCS index table 3)

[0039] • RNTI used in CRC scrambling of the DCI used for scheduling of the PDSCH (e.g., which one of C-RNTI or MCS-C-RNTI is CRC scrambled)

[0040] • Priority set through higher layer signaling

[0041] In the present disclosure, the high layer signaling can be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0042] The MAC signaling can be, for example, using a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), and the like. The broadcast information can be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), and the like.

[0043] The physical layer signaling can be, for example, downlink control information (Downlink Control Information (DCI)).

[0044] The traffic type can be associated with a communication requirement (a requirement of latency, error rate, and the like, a request condition), a data category (voice, data, and the like), and the like.

[0045] The difference between the requirement of URLLC and the requirement of eMBB can be that the latency of URLLC is smaller than that of eMBB, or that the requirement of URLLC includes a requirement of reliability.

[0046] For example, the requirement of user (U) plane latency of eMBB can include a downlink U plane latency of 4 ms and an uplink U plane latency of 4 ms. On the other hand, the requirement of U plane latency of URLLC can include a downlink U plane latency of 0.5 ms and an uplink U plane latency of 0.5 ms. Further, the requirement of reliability of URLLC can include an error rate of 32 bytes in a U plane latency of 1 ms of 10-5.

[0047] Furthermore, enhanced Ultra Reliable and Low Latency Communications (eURLLC) is being studied to improve the reliability of unicast data services. Hereinafter, URLLC and eURLLC will be referred to as URLLC when no distinction is made between them.

[0048] In NR versions after Rel. 16, studies are underway to assign multiple levels of priority (e.g., two levels) to specific signals or channels. For example, it is envisioned that different priorities will be assigned to each signal or channel corresponding to different service types (also known as services, service types, communication types, use cases, etc.), and communication control (e.g., transmission control in the event of a collision) will be performed. This will enable communication control by assigning different priorities to the same signal or channel, depending on the service type, etc.

[0049] Priority can also be set for signals (e.g., UCI such as HARQ-ACK, reference signals, etc.), channels (PDSCH, PUSCH, etc.), or HARQ-ACK codebooks. Priority can also be defined as a first priority (e.g., high) and a second priority (e.g., low) lower than the first priority. Alternatively, three or more priority levels can be set. Information related to priority can also be notified to the UE from the base station using at least one of higher layer signaling and DCI.

[0050] For example, the priority may be set for the HARQ-ACK for the dynamically scheduled PDSCH, the HARQ-ACK for the semi-persistent PDSCH (SPS PDSCH), and the HARQ-ACK for the SPS PDSCH release. Alternatively, the priority may be set for the HARQ-ACK codebook corresponding to these HARQ-ACKs. In addition, when setting the priority for the PDSCH, the priority of the PDSCH may be replaced with the priority of the HARQ-ACK for the PDSCH.

[0051] In the event of a conflict between different UL signals / UL channels, the UE may also control UL transmission based on priority. For example, the UE may control the UL transmission to be performed with a higher priority, while not performing (e.g., discarding) the UL transmission with a lower priority. Alternatively, the transmission timing of the UL transmission with a lower priority may be changed (e.g., postponed or shifted).

[0052] The conflict between different UL signals / UL channels may also be a case where time resources (or time resources and frequency resources) of different UL signals / UL channels overlap, or a case where transmission timings of different UL signals / UL channels overlap.

[0053] When the priority is notified using DCI, whether a bit field for notifying the priority is set for the DCI (e.g., a priority indicator) may be notified or set to the UE by the base station using higher layer signaling. In addition, when the DCI does not include a bit field for notifying the priority, the UE may also determine that the priority of the PDSCH (or the HARQ-ACK corresponding to the PDSCH) scheduled by the DCI is a specific priority (e.g., low).

[0054] (Unauthorized Zone)

[0055] In unlicensed bands (e.g., 2.4 GHz band, 5 GHz band, 6 GHz band, etc.), it is envisioned that multiple systems such as Wi-Fi systems and systems supporting Licensed-Assisted Access (LAA) (LAA systems) coexist, and therefore it is considered necessary to perform conflict avoidance and / or interference control for transmissions between these multiple systems.

[0056] In the LAA of the existing LTE system (e.g., Rel.13), the data sending device monitors the presence or absence of transmission by other devices (e.g., base stations, user terminals, Wi-Fi devices, etc.) before sending data in the unlicensed band. This monitoring can also be called Listen Before Talk (LBT), Clear Channel Assessment (CCA), carrier sensing, channel sensing, sensing, channel access procedure, shared spectrum channel access procedure, energy detection (ED), etc.

[0057] The transmitting device may be, for example, a base station (e.g., also referred to as a gNodeB (gNB) or a network (NW)) in the downlink (DL) or a user terminal (UE) in the uplink (UL). Furthermore, the receiving device that receives data from the transmitting device may be, for example, a user terminal in the DL or a base station (NW) in the UL.

[0058] In the existing LAA of the LTE system, the transmitting device starts transmitting data after a specific period (for example, immediately thereafter or during a backoff period) from when it detects that no other device is transmitting (idle state) in the LBT.

[0059] In future wireless communication systems (e.g., also known as 5G, 5G+, New Radio (NR), 3GPP Rel.15 and later), the use of unlicensed bands is also being studied. NR systems using unlicensed bands may also be referred to as NR-Unlicensed (U) systems, NR LAA systems, etc.

[0060] Dual Connectivity (DC) between the licensed band and the unlicensed band, Stand-Alone (SA) in the unlicensed band, etc. may also be included in NR-U.

[0061] In order to coexist with other systems or other operators, nodes in NR-U (e.g., base stations, UEs) start sending after confirming that the channel is idle through LBT.

[0062] In NR-U, when the LBT result is idle, the base station (e.g., gNB) or UE obtains a Transmission Opportunity (TxOP) and transmits. If the LBT result is busy (LBT-busy), the base station or UE does not transmit. The duration of the transmission opportunity is also called the Channel Occupancy Time (COT).

[0063] In addition, LBT-idle can be replaced by LBT success, and LBT-busy can be replaced by LBT failure.

[0064] (FBE / LBE)

[0065] In future wireless communication systems (e.g., NR after Rel. 16), research is underway to enable UEs to perform LBT based on multiple LBT types. This LBT mechanism can use either FBE (frame-based equipment) or LBE (load-based equipment).

[0066] FBE can also represent the following LBT mechanism, that is, it has a fixed frame period, uses part of its resources for sensing, and sends if the channel is available. If the channel is not available, it does not send but waits until the next sensing timing.

[0067] In NRs after Rel.16, when specific higher-layer parameters (e.g., ChannelAccessMode-r16) are provided to the UE and the specific higher-layer parameters meet specific conditions (e.g., ChannelAccessMode-r16=semistatic), the NW and UE can also perform LBT based on FBE. LBT based on FBE is also called semistatic LBT.

[0068] On the other hand, LBE may also refer to an LBT mechanism in which, when a result of sensing indicates that a channel is unusable, the sensing period is extended and sensing is continued until the channel becomes usable.

[0069] In NRs after Rel.16, when specific high-layer parameters (for example, ChannelAccessMode-r16) are provided to the UE and the specific high-layer parameters meet specific conditions (for example, set to ChannelAccessMode-r16=dynamic or ChannelAccessMode-r16 is not specified), the NW and the UE can also perform LBT based on LBE.

[0070] LBE-based LBT can also be called dynamic LBT. LBE-based LBT can also be distinguished by the type of LBT. The type of LBT can also be called channel access type, channel access mode, shared channel access type, etc.

[0071] In NRs after Rel.16, the channel access type can also be divided into any of Type 1, Type 2A, Type 2B, and Type 2C.

[0072] The names of the channel access types are not limited to these. For example, in "channel access type X", X can be represented by any number, letter, or combination of numbers and letters, or other names.

[0073] Type 1 channel access may also be channel access with a variable transmission wait time (contention window size (CWS)) accompanied by random back-off. Type 1 channel access may also be used in coexistence environments with other unlicensed bands (e.g., Wi-Fi).

[0074] In Type 1 channel access, a terminal (including terminals using other wireless communication standards) / gNB may also perform sensing during a specific period before transmitting a signal. This specific period may also consist of at least an extended period (also called a defer duration, e.g., 43 μs) and a sensing time slot (e.g., 9 μs).

[0075] In type 1 channel access, a specific counter (timer) may be set for the terminal / gNB, and the signal may be allowed to be sent when the counter expires (the counter value becomes 0).

[0076] This counter may be decremented every time a sensing slot (e.g., 9 μs) passes. This counter, set in a terminal / gNB, may be stopped for a specific period (the period during which the signal is being transmitted) upon detecting the transmission of a signal from a terminal / gNB other than the terminal / gNB (LBT busy). The counter may be restarted after the specific period (the period during which the signal is being transmitted) has passed.

[0077] When the value of the counter set for multiple terminals / gNBs becomes 0 at a certain moment and the signal transmissions of the multiple terminals / gNBs overlap, the CWS of the terminal can also be extended.

[0078] Type 2A channel access may also be channel access without random backoff. In Type 2A channel access, the UE may also be set with a first period (e.g., a 25 μs period (also referred to as a sensing interval, gap, etc.)) including a sensing period, and perform sensing during this period. If LBT idle occurs during this sensing, the UE may also transmit a signal immediately after this period.

[0079] Type 2B channel access may also be channel access without random backoff. In Type 2B channel access, the UE may be set to a second period (e.g., a 16μs period) that includes the sensing period and perform sensing during that period. If LBT idle occurs during this sensing, the UE may also transmit a signal immediately after the period has passed.

[0080] Type 2C channel access can also be channel access in which sensing is not performed for a period set to the UE, which is shorter than the first period or the second period (e.g., 16 µs). The UE can also perform transmission of a signal for a certain period (e.g., a period of maximum 584 µs) after the period just elapses.

[0081] In order to control a period in which sensing is performed in each type of channel access, a cyclic prefix (CP) extension can also be set. The CP extension can also be indicated by a certain time corresponding to a CP extension index. In the case of T TA As a timing advance (Timing Advance), the certain time can be at least one of 25 µs, 16 + T TA µs, 25 + T TA µs.

[0082] The UE can also receive information related to an indication of the above-described channel access type and CP extension based on at least one of high layer signaling and physical layer signaling.

[0083] In LBT based on FBE before Rel. 16, a base station and a UE perform transmission / reception of uplink (UL) / downlink (DL) signals / channels using a gNB-iniciated COT. The gNB-iniciated COT can also be a COT as a result of sensing performed by a certain base station (NW).

[0084] Before Rel. 16, the gNB-iniciated COT can also be included in a fixed frame period (FFP). The FFP can also be referred to as a periodic channel occupancy (PCO). The start position of the FFP of each radio frame can also be aligned with the start position of a certain (e.g., having an even index) radio frame.

[0085] The period of the FFP can also be set / informed to the UE through high layer signaling. The high layer signaling can also be system information block 1 (SIB1) signaling / RRC signaling. A high layer parameter set / informed through the high layer signaling can also be SemiStaticChannelAccessConfig. The period can also be determined from, for example, 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, 10 ms.

[0086] Figure 1This diagram shows an example of a base station-led COT in Rel. 16. The base station (gNB) performs sensing during a specific period (also called a sensing slot) immediately before the start of the FFP. The FFP consists of the COT, a specific idle period during which no signal / channel transmission or reception is performed, and a period during which sensing is performed (sensing slot).

[0087] If LBT is successful, the gNB obtains a COT (gNB-led COT). This COT is included in the FFP (here, a 10ms period), and the start position of the COT is aligned with the start position of the FFP. The start position of the FFP is aligned with the start position of each radio frame (here, frame #0 and frame #1). The gNB transmits DL signals / channels and UL signals / channels within the obtained COT.

[0088] In addition, in a gNB-led COT, the gNB may also transmit DL signals / channels first. In other words, in a gNB-led COT, the UE may also receive DL signals / channels first.

[0089] However, in future wireless communication systems (e.g., NR after Rel. 17), research is underway to introduce UE-initiated COT for FBE in order to further advance highly reliable and low-latency communications (e.g., services such as URLLC). However, research on this UE-initiated COT is insufficient.

[0090] Specifically, there is insufficient research on the starting position and period (duration) of the FFP associated with UE-directed COT. Furthermore, there is insufficient research on the methods for setting / indicating UE-directed COT (e.g., whether the setting / indication is cell-specific or UE-specific, or is set / indicated for all UL signals / channels or for each UL signal / channel).

[0091] In the absence of such sufficient research, there are concerns about reduced throughput or deterioration in communication quality when using services such as URLLC in the NR-U system.

[0092] Therefore, the inventors of the present invention have come up with a method for constructing an FFP including a UE-led COT when using service types such as URLLC in an NR-U system.

[0093] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the various embodiments may be applied individually or in combination.

[0094] In the present disclosure, "A / B" can also be replaced with at least one of A and B, and "A / B / C" can also be replaced with at least one of A, B and C.

[0095] In this disclosure, the gNB-led COT may also be referred to as the first COT, the semi-static COT in the FBE, etc. Furthermore, in this disclosure, the FFP for the gNB-led COT may also be referred to as the FFP for the first COT, the FFP included in the first COT, the first FFP, the FFP for the semi-static COT in the FBE, etc.

[0096] In this disclosure, the UE-led COT may also be referred to as the second COT, the dynamic COT in the FBE, etc. In addition, in this disclosure, the FFP for the UE-led COT may also be referred to as the FFP for the second COT, the FFP included in the second COT, the second FFP, the FFP for the dynamic COT in the FBE, etc.

[0097] (Wireless Communication Method)

[0098] <First embodiment>

[0099] While the first embodiment describes the starting position and cycle (duration) of the second FFP, the starting position and cycle (duration) of the second FFP may be determined in accordance with at least one of the following embodiments 1-1 to 1-4.

[0100] [Implementation Method 1-1]

[0101] The starting position and period (duration) of the second FFP may also be determined based on the first FFP. For example, the starting position and period of the second FFP in a specific period (e.g., a specific frame) may be the same as the starting position and period of the first FFP in that specific period. In other words, the UE may also transmit and receive signals / channels in a COT included in a second FFP having the same starting position and period as the first FFP.

[0102] At this time, the starting position of the second FFP of each of N consecutive radio frames (for example, N=2) may also be aligned with the starting position of a specific radio frame (for example, with an even-numbered index).

[0103] Furthermore, information related to the second FFP period may be configured / notified to the UE via a higher-layer parameter (e.g., SemiStaticChannelAccessConfig) via higher-layer signaling (SIB1 signaling / RRC signaling). This period may be determined, for example, from 1ms, 2ms, 2.5ms, 4ms, 5ms, or 10ms, or may be expressed as an integer multiple of a specific period (e.g., a slot, a subslot, a symbol, or a subframe), or may be expressed as an arbitrary time period.

[0104] Alternatively, the UE may receive information related to the duration of the second FFP based on a specific field included in the DCI that schedules the transmission of the UL signal / channel in the second COT. This DCI may also be the DCI included in the first COT.

[0105] Furthermore, the UE may be notified of / set with a set (list) of information related to the second FFP period via higher layer signaling. Subsequently, the UE may select (determine) information related to the second FFP period applied in the second COT from this set based on a specific field included in the DCI that schedules the transmission of the UL signal / channel in the second COT. This DCI may also be the DCI included in the first COT.

[0106] Figure 2 This is a diagram showing an example of UE-led COT. Figure 2 In the example, the first FFP (FFP for gNB-led COT) is included in frame #0 and frame #1, and the second FFP (FFP for UE-led COT) is included in frame #2 and frame #3. Figure 2 The first FFP in frame #0 and frame #1 is Figure 1 The gNB can obtain the first COT even in frame #2 and frame #3, and the first FFP in frame #2 and frame #3 can be the same as the first FFP in frame #0 and frame #1.

[0107] exist Figure 2 In the example shown, the period (duration) of the first FFP is set to 10 ms. Figure 2 The cycle (duration) of the second FFP is also set to 10ms.

[0108] The UE performs channel sensing during a specific period immediately before frame #2 and during a specific period immediately before frame #3. If this sensing is successful, the UE may immediately transmit and receive signals / channels. The UE may also perform channel sensing after a specific idle period has elapsed following the transmission and reception of the signals / channels.

[0109] In addition, in the present disclosure, in a UE-led COT, the UE may first transmit an UL signal / channel. For example, UL may be configured (or scheduled for UL transmission) in the first symbol of the UE-led COT.

[0110] In addition, in the present disclosure, whether the UE leads the COT can also be determined by the UE for the transmission of UL signals / channels that depend on the UE's internal state (for example, at least one of CG-PUSCH, SR, and PRACH). Regarding the transmission of channels other than these UL signals / channels, the UE can also lead the COT based on settings / instructions from the base station.

[0111] In the diagrams illustrating the COT configuration of the present disclosure, the lengths and configurations of the FFP, COT, radio frames, and periods used for signal / channel transmission and reception are merely examples and are not limiting. For example, the number of frames for which the first COT is set and the number of frames for which the second COT is set may be the same or different.

[0112] According to embodiment 1-1, no new settings or structures are required for the UE, and implementation for the UE can be simplified.

[0113] [Implementation 1-2]

[0114] The starting position of the second FFP may also be determined based on the first FFP. For example, the starting position of the second FFP may be the same as the starting position of the first FFP. In other words, the UE may also transmit and receive signals / channels in the COT included in the second FFP having the same starting position as the first FFP.

[0115] At this time, the starting position of the second FFP of each of N consecutive radio frames (for example, N=2) may also be aligned with the starting position of a specific radio frame (for example, with an even-numbered index).

[0116] In this case, information related to the duration of the second FFP may be set / notified to the UE using parameters other than specific higher-layer parameters (e.g., parameters other than SemiStaticChannelAccessConfig) based on higher-layer signaling (SIB1 signaling / RRC signaling). This duration may be determined, for example, from 1ms, 2ms, 2.5ms, 4ms, 5ms, or 10ms, or may be expressed as an integer multiple of a specific period (e.g., a slot, a subslot, a symbol, or a subframe), or may be expressed as an arbitrary time. This duration may also be a value different from the duration of the first FFP set using specific higher-layer parameters (e.g., SemiStaticChannelAccessConfig).

[0117] Figure 3 are diagrams illustrating other examples of UE-led COT. In Figure 3 In the example of FIG. 10, a first FFP (FFP for gNB-led COT) is included in frame #0 and frame #1, and a second FFP (FFP for UE-led COT) is included in frame #2 and frame #3. With respect to the first FFP in Figure 3 Figure 2

[0118] In the example illustrated in FIG. 11, the UE sets the period (duration) of the second FFP to 5 ms through a specific higher layer parameter. The UE performs sensing of the channel in a specific period just before the start of each FFP included in frame #2 and frame #3. In a case where the sensing is successfully performed, the UE can also perform transmission / reception of signals / channels immediately thereafter. The UE can also perform sensing of the channel after performing transmission / reception of the signals / channels, after a lapse of a specific idle period. Figure 3

[0119] According to Embodiment 1-2, transmission / reception of UL signals / channels with higher flexibility can be performed, and higher reliability of communication can be ensured.

[0120] [Embodiment 1-3]

[0121] The period (duration) of the second FFP can also be decided based on the first FFP. For example, the period (duration) of the second FFP can be the same as the period of the first FFP. In other words, the UE can perform transmission / reception of signals / channels in a COT included in the second FFP having the same period as the first FFP.

[0122] At this time, the start position of the second FFP of each of N (for example, N = 2) consecutive radio frames can also be misaligned with the start position of a specific (for example, having an even index) radio frame.

[0123] At this time, information related to the start position of the second FFP can also be set / informed to the UE through a specific higher layer parameter based on higher layer signaling (SIB1 signaling / RRC signaling). The specific higher layer parameter can also be information indicating a time (offset) from a specific reference point (for example, the start position of a certain radio frame) to the start position of the second FFP. The offset can be decided from, for example, values of 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, etc., can be represented by an integer multiple of a specific period (for example, a slot, a sub-slot, a symbol, a subframe), or can be represented by an arbitrary time.

[0124] ​​​In addition, the UE may also receive information related to the starting position of the second FFP based on a specific field included in the DCI that schedules the transmission of the UL signal / channel in the second COT. The DCI may also be the DCI included in the first COT.

[0125] In addition, the UE may be notified of / set via higher layer signaling a set (list) of information related to the starting position of the second FFP. Subsequently, the UE may select (determine) information related to the starting position of the second FFP applied in the second COT from this set based on a specific field included in the DCI that schedules the transmission of the UL signal / channel in the second COT. This DCI may also be the DCI included in the first COT.

[0126] Embodiments 1-3 can also be applied when the gNB fails LBT in the FFP included in a radio frame. That is, the UE can determine whether to obtain the second COT based on the success / failure of LBT by the gNB. Furthermore, Embodiments 1-3 can also be applied regardless of the success / failure of LBT by the gNB.

[0127] The UE may also implicitly determine that gNB-based LBT has failed. For example, if the UE does not receive a DL signal / channel from the gNB in ​​a certain frame, it may determine that gNB-based LBT has failed. If the UE makes such a determination, the UE may also control the acquisition of a second COT after a specific period (offset) from the start of the certain frame.

[0128] The gNB can also implicitly determine that UE-based LBT has failed. For example, if the gNB does not receive a UE signal / channel from the UE during the second COT of a frame, the gNB can determine that UE-based LBT has failed. If the gNB makes this determination, the gNB can also control the gNB to obtain the first COT at the beginning of the frame following the frame.

[0129] Figure 4 FIG is a diagram showing another example of UE-led COT. Figure 4 In the example, the first FFP (FFP for gNB-led COT) is included in frame #0, and the second FFP (FFP for UE-led COT) is included in frames #1, #2, and #3. Figure 4 The first FFP in Figure 2 same.

[0130] exist Figure 4In the illustrated example, the UE is set / informed of the offset of the starting position of the second FFP (5 ms here) by a specific higher layer parameter (information related to the starting position of the second FFP). The UE obtains the second COT 0.5 ms after the starting position of frame #1. The period of the second FFP is applied to the period of the first FFP (10 ms here). The UE performs sensing of the channel in a specific period just before the start of the second COT. In the case where the sensing is successfully performed, the UE can also perform transmission / reception of signals / channels immediately thereafter. The UE can also perform sensing of the channel after the transmission / reception of the signals / channels, through a specific idle period.

[0131] In Figure 4 In the illustrated example, the period (duration) of the second FFP can also be the same as the period (duration) of the first FFP. Information related to the duration of the second FFP can also be set / informed to the UE by a higher layer parameter (for example, SemiStaticChannelAccessConfig) based on higher layer signaling (SIB1 signaling / RRC signaling). The duration can be determined from 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, 10 ms, for example, can be represented by an integer multiple of a specific duration (for example, slot, sub-slot, symbol, subframe), and can also be represented by an arbitrary time.

[0132] According to Embodiment 1-3, communication restart can be performed more quickly after UE / gNB-based LBT failure.

[0133] [Embodiment 1-4]

[0134] The starting position and the period (duration) of the second FFP can also be determined independently of the first FFP. For example, the starting position and the period of the second FFP can also be different from the starting position and the period of the first FFP. In other words, the UE can also perform transmission / reception of signals / channels in a COT contained in the second FFP having a different starting position and period from the first FFP.

[0135] At this time, the starting position of the second FFP of each of N (for example, N = 2) consecutive radio frames can also be misaligned (for example, have an even index) with the starting position of a specific radio frame.

[0136] At this time, information related to the start position of the second FFP can also be set / informed to the UE through a specific higher layer parameter based on higher layer signaling (SIB1 signaling / RRC signaling). The specific higher layer parameter can also be information indicating an offset from the start position of a certain radio frame. The offset can be determined from, for example, 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, or the like, can be expressed by an integer multiple of a specific period (e.g., slot, sub-slot, symbol, subframe), or can be expressed by an arbitrary time.

[0137] In addition, the UE can also receive information related to the start position of the second FFP based on a specific field included in DCI scheduling transmission of an UL signal / channel in the second COT. The DCI can also be DCI included in the first COT.

[0138] In addition, the UE can also be informed / set of a set (list) of information related to the start position of the second FFP through higher layer signaling. Next, the UE can also select (determine) information related to the start position of the second FFP applied in the second COT from the set based on a specific field included in DCI scheduling transmission of an UL signal / channel in the second COT. The DCI can also be DCI included in the first COT.

[0139] At this time, information related to the period of the second FFP can also be set / informed to the UE through a parameter other than a specific higher layer parameter based on higher layer signaling (SIB1 signaling / RRC signaling) (e.g., a parameter other than SemiStaticChannelAccessConfig). The period can be determined from, for example, 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, 10 ms, can be expressed by an integer multiple of a specific period (e.g., slot, sub-slot, symbol, subframe), or can be expressed by an arbitrary time. The period can also be a value different from the period of the first FFP set through a specific higher layer parameter (e.g., SemiStaticChannelAccessConfig).

[0140] In addition, the UE can also receive information related to the period of the second FFP based on a specific field included in DCI scheduling transmission of an UL signal / channel in the second COT. The DCI can also be DCI included in the first COT.

[0141] Further, the UE can also be notified / set, by higher layer signaling, a set (list) of information related to the duration of the second FFP. Next, the UE can also select (determine), from the set, the information related to the duration of the second FFP applied in the second COT, based on a specific field contained in the DCI scheduling the transmission of the UL signal / channel in the second COT. The DCI can also be the DCI contained in the first COT.

[0142] The information related to the starting position of the second FFP and the information related to the duration of the second FFP can also be contained in the same higher layer parameter information element. Further, the information related to the starting position of the second FFP and the information related to the duration of the second FFP can also be contained in different higher layer parameter information elements. The UE can also implicitly determine at least one of the information related to the starting position of the second FFP and the information related to the duration of the second FFP from other parameters.

[0143] Embodiment 1-4 can also be applied in the FFP contained in a certain radio frame when the gNB fails in LBT, the same as Embodiment 1-3. That is, the UE can also determine whether to obtain the second COT according to the success / failure of the gNB-based LBT. Further, Embodiment 1-3 can also be applied regardless of the success / failure of the gNB-based LBT.

[0144] The UE can also implicitly determine the failure of the gNB-based LBT. For example, the gNB-based LBT can be determined as failed in the case that the UE does not receive the DL signal / channel from the gNB in a certain frame. In the case that the UE determines like this, the UE can also control to obtain the second COT after a certain duration (offset) from the starting position of the certain frame.

[0145] The gNB can also implicitly determine the failure of the UE-based LBT. For example, the UE-based LBT can be determined as failed in the case that the gNB does not receive the UE signal / channel from the UE in the second COT in a certain frame. In the case that the gNB determines like this, the gNB can also control to obtain the first COT in the starting position of the next frame of the certain frame.

[0146] Figure 5 is a diagram showing another example of UE-led COT. In Figure 5 In the example of, the first FFP (FFP for gNB-led COT) is contained in frame #0, and the second FFP (FFP for UE-led COT) is contained in frame #1. Regarding the first FFP in, the same as applies. Figure 5 Figure 2

[0147] ​​exist Figure 5 In the example shown, the UE is set / notified of the offset of the starting position of the second FFP (here 0.5ms) through a specific high-level parameter (information related to the starting position of the second FFP). In addition, the UE is set / notified of the period (period, here 2.5ms) of the second FFP through a specific high-level parameter (information related to the period of the second FFP), and the UE obtains the second COT 0.5ms after the starting position of frame #1. The UE performs channel sensing in a specific period immediately before the start of the second COT. If the sensing is successfully performed, the UE may also perform signal / channel transmission and reception immediately thereafter. The UE may also perform channel sensing after a specific idle period after performing the signal / channel transmission and reception.

[0148] According to embodiments 1-4, UL signals / channels can be sent and received with greater flexibility, higher communication reliability can be ensured, and communication can be resumed more quickly after a UE / gNB-based LBT failure.

[0149] As described above, according to the first embodiment, it is possible to configure an appropriate UE-led COT.

[0150] <Second embodiment>

[0151] In the second embodiment, a method for applying the second COT to UL signals / channels is described. The UE may also use the second COT when transmitting UL signals / channels in accordance with at least one of the following embodiments 2-1 and 2-2. The second COT may also be applied using any of the methods described in the first embodiment.

[0152] [Implementation Method 2-1]

[0153] The UE may also set the second COT in common for a plurality of (eg, all) UL signals / channels and transmit the UL signals / channels.

[0154] The multiple UL signals / channels may also be at least one of PUCCH / PUSCH / PRACH / SRS configured by higher layer parameters, PUCCH / PUSCH / PRACH / SRS triggered / scheduled by DCI, and PUSCH scheduled by RAR UL grant.

[0155] At this time, information related to the starting position of the second FFP (COT) and information related to the period of the second FFP (COT) may also be notified / set to the UE through higher layer signaling (eg, SIB1 signaling / RRC signaling).

[0156] According to Embodiment 2-1, the UE-dominant COT can be commonly set for multiple UL signals / channels, and an increase in signaling overhead can be suppressed.

[0157] [Embodiment 2-2]

[0158] The UE can also independently set a second COT for each UL signal / channel, and perform transmission of the UL signal / channel.

[0159] The UL signal / channel can also be at least one of PUCCH, PUSCH, PRACH, and SRS, which is set by a higher layer parameter. At this time, at least one of information related to a start position of the second FFP (COT) and information related to a period of the second FFP (COT) can also be notified / set to the UE through higher layer signaling (e.g., SIB1 signaling / RRC signaling).

[0160] Further, the multiple UL signals / channels can also be at least one of PUCCH, PUSCH, PRACH, and SRS, which is triggered / scheduled by DCI. At this time, at least one of a set of information related to a start position of the second FFP (COT) and a set of information related to a period of the second FFP (COT) can also be notified / set to the UE through higher layer signaling (e.g., SIB1 signaling / RRC signaling), and the UE can also determine a value of the start position / period based on a value of a specific field included in the triggering / scheduling DCI.

[0161] Further, PUSCH scheduled by a RAR UL grant can also be included in the multiple UL signals / channels. At this time, at least one of a set of information related to a start position of the second FFP (COT) and a set of information related to a period of the second FFP (COT) can also be notified / set to the UE through higher layer signaling (e.g., SIB1 signaling / RRC signaling), and the UE can also determine a value of the start position / period based on a value of a specific field included in the RAR UL grant.

[0162] According to Embodiment 2-2, a second COT can be determined for each UL signal / channel, and more flexible communication can be performed.

[0163] [Third Embodiment]

[0164] In the third embodiment, a method of applying a second COT for multiple UEs included in a certain serving cell is described. The UE can also follow at least one of Embodiments 3-1 and 3-2 shown below, and use the second COT at the time of transmission of an UL signal / channel. As for the use of the second COT, any of the methods shown in the first embodiment can also be used.

[0165] [Embodiment 3-1]

[0166] The UE can also set the second COT commonly for a plurality of (e.g., all) UEs included in a certain serving cell, and perform transmission of the UL signal / channel. In other words, the UE can also assume that the information related to the second FFP (COT) is notified commonly for a plurality of UEs in the serving cell.

[0167] At this time, the information related to the second FFP (COT) set to the UE (e.g., at least one of the information related to the start position of the second FFP (COT) and the information related to the period of the second FFP (COT)) can also be notified to the UE through higher layer signaling (e.g., SIB1 signaling / RRC signaling).

[0168] Further, the information related to the second FFP (COT) set to the UE can also be indicated to the UE through physical layer signaling (e.g., group-common PDCCH).

[0169] According to Embodiment 3-1, it is possible to set the UE-dominant COT commonly for a plurality of UEs included in a serving cell, and it is possible to suppress an increase in the overhead of signaling.

[0170] [Embodiment 3-2]

[0171] The UE can also set the second COT independently for each UE included in a certain serving cell, and perform transmission of the UL signal / channel. In other words, the UE can also assume that the information related to the second FFP (COT) is notified independently for each UE in the serving cell.

[0172] At this time, the information related to the second FFP (COT) set to the UE (e.g., at least one of the information related to the start position of the second FFP (COT) and the information related to the period of the second FFP (COT)) can also be notified / set / indicated to the UE through higher layer signaling (e.g., RRC signaling) and physical layer signaling (e.g., DCI).

[0173] According to Embodiment 3-2, it is possible to determine the second COT for each UE included in a serving cell, and it is possible to perform more flexible communication.

[0174] (Wireless communication system)

[0175] Hereinafter, a structure of a wireless communication system to which an embodiment of the present disclosure relates will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0176] Figure 6 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), or the like.

[0177] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0178] 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.

[0179] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0180] The wireless communication system 1 may also include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are deployed within the macrocell C1 and form small cells C2 that are narrower than the macrocell C1. User terminals 20 may also be located within at least one of the cells. The configuration and number of cells and user terminals 20 are not limited to those shown in the figure. Hereinafter, when not distinguishing between base stations 11 and 12, they are collectively referred to as base stations 10.

[0181] 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 (CCs) and dual connectivity (DC).

[0182] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0183] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0184] Multiple base stations (e.g., RRHs) 10 may be connected via a wired connection (e.g., an optical fiber based on a Common Public Radio Interface (CPRI) or an X2 interface) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11, which is equivalent to the upper station, may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which is equivalent to a relay station (relay), may also be referred to as an IAB node.

[0185] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0186] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0187] In the wireless communication system 1, a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), or single carrier frequency division multiple access (SC-FDMA) may be used.

[0188] The radio access scheme may also be referred to as a waveform. In addition, 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.

[0189] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0190] In addition, as uplink channels, the wireless communication system 1 can also use 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.

[0191] User data, higher-layer control information, and system information blocks (SIBs) are transmitted via the PDSCH. User data, higher-layer control information, and the like can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0192] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0193] In addition, the DCI that schedules the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0194] In PDCCH detection, a control resource set (CORESET) and a search space can also be used. A CORESET corresponds to the resources for searching for DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space settings.

[0195] One search space can also correspond to PDCCH candidates equivalent to one or a plurality of aggregation levels. One or a plurality of search spaces can also be referred to as a search space set. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", and the like of the present disclosure can also be replaced with each other.

[0196] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (for example, also referred to as Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK), ACK / NACK, and the like), and a scheduling request (Scheduling Request (SR)) can also be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through the PRACH.

[0197] In addition, in the present disclosure, "downlink", "uplink", and the like can also be described without "link". Furthermore, it can also be described without "Physical" at the beginning of various channels.

[0198] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like can also be transmitted. As the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like can also be transmitted in the wireless communication system 1.

[0199] For example, a synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SSs (PSS, SSS) and PBCHs (and DMRS for PBCHs) may also be referred to as an SS / PBCH block or an SS block (SSB). Furthermore, SSs and SSBs may also be referred to as reference signals.

[0200] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0201] (Base Station)

[0202] Figure 7 This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, more than one of each of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission path interface 140 may be provided.

[0203] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0204] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0205] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. It may also control transmission and reception, measurement, etc., using the transmission and reception unit 120, the transmission and reception antennas 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting up, releasing, etc.) of communication channels, manage the status of the base station 10, manage radio resources, etc.

[0206] The transceiver 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 transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0207] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0208] The transmitting and receiving antenna 130 can be formed of an antenna described based on common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0209] The transmitting and receiving unit 120 may also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the aforementioned uplink channel, uplink reference signal, etc.

[0210] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmit beam and a receive beam.

[0211] The sending and receiving unit 120 (sending processing unit 1211) can also perform processing on the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (for example, RLC retransmission control), the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0212] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0213] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0214] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 130 .

[0215] The transmitting and receiving unit 120 (receiving processing unit 1212) can also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0216] The transmitting and receiving unit 120 (measuring unit 123) may also perform measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may 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 may also be output to the control unit 110.

[0217] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0218] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0219] The transmitting and receiving unit 120 may also transmit information related to the channel occupancy time (COT) during the semi-static channel access process. The control unit 110 may also control reception of the uplink channel in the COT based on the information related to the COT (first embodiment).

[0220] (User Terminal)

[0221] Figure 8 This figure shows an example of the configuration 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. Furthermore, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0222] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0223] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0224] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission, reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission and reception unit 220.

[0225] The transceiver 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 transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0226] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit or may be composed of a transmitting unit and a receiving unit. The transmitting unit may also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0227] The transmitting and receiving antenna 230 can be formed of an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0228] The transmitting and receiving unit 220 may also receive the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the aforementioned uplink channel, uplink reference signal, etc.

[0229] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0230] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0231] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0232] In addition, whether or not to apply DFT processing may also be based on the transform precoding setting. For a certain channel (e.g., PUSCH), if transform precoding is valid (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing without performing DFT processing.

[0233] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0234] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 230 .

[0235] The transmitting and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing 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 the obtained baseband signal to obtain user data, etc.

[0236] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to received signals. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signals. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0237] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0238] The transmitting and receiving unit 220 may also receive information related to the channel occupancy time (COT) during the semi-static channel access process. The control unit 210 may also control the dominance of the COT based on the information related to the COT (first embodiment).

[0239] The information related to the COT may be at least one of information related to a start position of a periodic channel occupation (PCO) including the COT and information related to a period of the PCO including the COT (first embodiment).

[0240] The control unit 210 may also control the dominance of the COT in common for a plurality of uplink (UL) channels, or may also control the dominance of the COT independently for each UL channel (second embodiment).

[0241] The control unit 210 may also be configured to commonly notify a plurality of terminals within a serving cell of the information related to the COT, or to independently notify each terminal within a serving cell of the information related to the COT (third embodiment).

[0242] (Hardware Structure)

[0243] In addition, the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wired, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0244] Here, in the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that realizes a transmission function can also be referred to as a transmitting unit, a transmitter, or the like. Any one of these is as described above, and the implementation method is not particularly limited.

[0245] For example, the base station, the user terminal, and the like in one embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 9 is a diagram illustrating an example of a 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 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0246] In addition, in the present disclosure, the terms of device, circuit, apparatus, section, unit, and the like can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device illustrated in the diagram, or can be configured not to include a part of the devices.

[0247] For example, the processor 1001 is illustrated as one, but there can be a plurality of processors. Furthermore, the processing can be performed by one processor, or can be performed by two or more processors simultaneously, sequentially, or with other methods. In addition, the processor 1001 can be realized by one or more chips.

[0248] Regarding each function in the base station 10 and the user terminal 20, at least one of the operation and the control of the communication via the communication device 1004, or the readout and the writing of the data in the memory 1002 and the storage 1003, is realized by the processor 1001 by reading a specific software (program) into the hardware such as the processor 1001 and the memory 1002.

[0249] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, at least a portion of the control unit 110 (210) and the transmitting and receiving unit 120 (220) described above may also be implemented by the processor 1001.

[0250] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and performs various processes based on them. As a program, a program that causes a 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 by the processor 1001, and the other functional blocks can also be implemented similarly.

[0251] The memory 1002 may also be a computer-readable recording medium, for example, comprised 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 medium. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of the present disclosure.

[0252] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, or a key drive), a magnetic stripe, a database, a server, or other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0253] The communication device 1004 is hardware (a transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. To implement at least one of frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the aforementioned transmitting and receiving unit 120 (220), transmitting and receiving antenna 130 (230), and the like may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be implemented by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0254] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, light emitting diode (LED) lamp, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).

[0255] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0256] Furthermore, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and may use such hardware to implement part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0257] (Variation)

[0258] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, or may be referred to as a pilot, pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0259] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) that constitute 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) that is independent of the parameter set (numerology).

[0260] Here, the parameter set may also be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filter processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, and the like.

[0261] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0262] A time slot may also contain multiple mini-slots. Each mini-slot may also consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

[0263] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units used for signal transmission. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective equivalents. Furthermore, the terms frame, subframe, time slot, mini-time slot, and symbol may be used interchangeably in this disclosure.

[0264] For example, a subframe can be called a TTI, multiple consecutive subframes can be called a TTI, and a slot or a mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Furthermore, the unit representing a TTI can be called a slot, a mini-slot, or the like, rather than a subframe.

[0265] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each user terminal by allocating radio resources (such as the frequency bandwidth and transmit power available to each user terminal) in TTI units. The definition of TTI is not limited to this.

[0266] The TTI may also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and may also be a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

[0267] In addition, when a time slot or a mini-time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) that constitute the minimum time unit for scheduling can also be controlled.

[0268] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a subslot, a time slot, etc.

[0269] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be replaced by TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be replaced by TTI with a TTI length smaller than long TTI and greater than 1ms.

[0270] A resource block (RB) is a unit of resource allocation in the time domain and the frequency domain, and can include one or more contiguous subcarriers in the frequency domain. The number of subcarriers included in an RB can also be the same regardless of numerologies, for example, 12. The number of subcarriers included in an RB can also be determined based on numerologies.

[0271] In addition, an RB can include one or more symbols in the time domain, and can be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be composed of one or more resource blocks, respectively.

[0272] In addition, one or more RBs can also be referred to as a physical RB (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0273] In addition, a resource block can also be composed of one or more resource elements (REs). For example, one RE can also be a wireless resource area of one subcarrier and one symbol.

[0274] A bandwidth part (BWP) (may also be referred to as a partial bandwidth, etc.) can also indicate a subset of contiguous common RBs (common resource blocks) for a certain numerology in a certain carrier. Here, the common RBs can be determined by the index of the RBs with respect to the common reference point of the carrier. A PRB can also be defined in a certain BWP and additionally numbered within the BWP.

[0275] A UL BWP (BWP for UL) and a DL BWP (BWP for DL) can also be included in a BWP. For a UE, one or more BWP can also be configured within one carrier.

[0276] At least one of the configured BWP can also be activated, and the UE can not be assumed to transmit and receive a specific signal / channel outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure can also be replaced with "BWP".

[0277] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0278] Furthermore, the information and parameters described in this disclosure may be expressed as absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may be indicated by specific indexes.

[0279] The names used for parameters, etc. in this disclosure are not intended to be limiting in any respect. Furthermore, the mathematical formulas for 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 names, and therefore, the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0280] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0281] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0282] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or appended. Output information, signals, etc. may also be deleted. Input information, signals, etc. may also be sent to other devices.

[0283] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-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 a combination thereof.

[0284] In addition, physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. In addition, MAC signaling may also be notified using, for example, a MAC Control Element (CE).

[0285] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0286] The determination can be made by a value represented by a bit (0 or 1), a true or false value (Boolean value) represented by true (true) or false (false), or by comparison of numerical values ​​(for example, comparison with a specific value).

[0287] Software, regardless of the term by which it is known, should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0288] Also, software, instructions, information, etc. can be transmitted as encoded signals using a transmission medium via a communication link over a communication network and / or a bus. For example, when the software is transmitted from a website, server, or other remote source using at least one of wired technology (coaxial cables, fiber optic cables, twisted pair cables, Digital Subscriber Line (DSL), or others) and / or wireless technology (infrared, microwave, radio frequency, etc.), at least one of these technologies is included within the definition of transmission medium.

[0289] The terms “system” and “network” used in the present disclosure can be used interchangeably. “Network” can also mean a device (e.g., a base station) included in the network.

[0290] In the present disclosure, the terms “precoding”, “precoder”, “weight (precoding weight)”, “Quasi-Co-Location (QCL)”, “Transmission Configuration Indication state (TCI state)”, “spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, “antenna port”, “antenna port group”, “layer”, “number of layers”, “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel”, etc. can be used interchangeably.

[0291] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP))", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. In some cases, a base station may be referred to as a macro cell, small cell, femto cell, or pico cell.

[0292] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entire coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within that coverage area.

[0293] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (UE)”, and “terminal” can be used interchangeably.

[0294] 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, hand set, user agent, mobile client, client, or several other appropriate terms.

[0295] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Furthermore, at least one of the base station and the mobile station may also be a device mounted on a mobile object, a mobile object itself, etc. The mobile object may be a means of transportation (e.g., a vehicle, an aircraft, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0296] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by communication between multiple user terminals (for example, which may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0297] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0298] In the present disclosure, operations are assumed to be performed by a base station, and sometimes, depending on the circumstances, by its upper node. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME)), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0299] The various methods / implementations described in this disclosure may be used individually or in combination, and may be switched between them during execution. Furthermore, the processing procedures, sequences, flow charts, and the like of the various methods / implementations described in this disclosure may be reversed as long as they do not conflict. For example, the methods described in this disclosure use an illustrative order to present elements of various steps, but are not limited to the specific order presented.

[0300] The various modes and embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.18 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (WiMAX (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (WiMAX (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined for application (for example, LTE or LTE-A, combined with 5G, etc.).

[0301] The phrase “based on” used in this disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0302] Any reference to an element or steps in a claim that is comprised of more than one step, or refers to a function of said element or step, is not to be construed as an implicit disclosure of each and every possible sub-combination of said element or step unless explicitly stated otherwise.

[0303] As used in this disclosure, the term "determining" encompasses a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, looking up (such as looking up in a table, a database or another data structure), ascertaining and the like.

[0304] As used in this disclosure, "determining" also encompasses receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory) and the like.

[0305] As used in this disclosure, "determining" also encompasses resolving, selecting, choosing, establishing and the like.

[0306] As used in this disclosure, "determining" can also be construed as "assuming," "expecting," "considering," and the like.

[0307] 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 the two elements being "connected" or "coupled." The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be replaced by "access."

[0308] In the present disclosure, when two elements are connected, it is possible to consider them being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0309] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other." Alternatively, the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may also be interpreted in the same way as "different."

[0310] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," have an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0311] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include a case where the noun following the article is in a plural form.

[0312] While the inventions disclosed herein have been described in detail above, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The inventions disclosed herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the descriptions in this disclosure are for illustrative purposes only and are not intended to limit the inventions disclosed herein in any way.

Claims

1. A terminal comprising: a receiving unit, receiving a radio resource control information element (RRC IE) including first information indicating a period of periodic channel occupation (PCO) and second information indicating an offset from a start position of a specific radio frame to a start position of the PCO; and The control unit controls the leading of the PCO based on the RRC IE.

2. The terminal according to claim 1, wherein: The specific radio frame is a radio frame having an even-numbered index.

3. The terminal according to claim 1, wherein: The terminal-led PCO and the base station-led PCO are set independently.

4. A wireless communication method, which is a wireless communication method of a terminal, comprising: The step of receiving a radio resource control information element (RRC IE) including first information indicating a period of periodic channel occupation (PCO) and second information indicating an offset from a start position of a specific radio frame to a start position of the PCO; and Based on the RRC IE, the leading step of the PCO is controlled.

5. A base station comprising: a transmitting unit configured to transmit a radio resource control information element (RRC IE) including first information indicating a period of periodic channel occupation (PCO) and second information indicating an offset from a start position of a specific radio frame to a start position of the PCO; and The control unit determines that the PCO is controlled by the terminal based on the RRCIE.

6. A system having a terminal and a base station, The terminal has: a receiving unit, receiving a radio resource control information element (RRC IE) including first information indicating a period of periodic channel occupation (PCO) and second information indicating an offset from a start position of a specific radio frame to a start position of the PCO; and A control unit controls the leading of the PCO based on the RRC IE, The base station has: A sending unit, wherein the sending unit sends the RRC IE.

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