Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit which receives information on a channel occupancy time (COT) in a quasi-static channel access procedure; and a control unit which controls the initiative of the COT on the basis of the information on the COT. According to an aspect of the present disclosure, wireless communication in an NR-U system can be appropriately controlled.

Description

[Technical field]

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

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

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel. 15 or later) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., 5G, 5G+, New Radio (NR), 3GPP Rel. 16 and later), the use of unlicensed bands (which may also be called NR-Unlicensed (U) systems), similar to existing wireless communication systems (e.g., 3GPP Rel. 15 and earlier), is being considered.

[0006] In addition, in future wireless communication systems (e.g., 5G, 5G+, New Radio (NR), 3GPP Rel. 16 and later), the introduction of Downlink Control Information (DCI) formats (e.g., DCI formats 0_2, 1_2) for traffic types such as high-reliability and low-latency communications (e.g., Ultra-Reliable and Low-Latency Communications (URLLC)) is being considered.

[0007] However, in uplink communications for traffic types such as URLLC, there has been insufficient consideration of User Equipment (UE)-initiated Channel Occupancy Time (COT) for frame-based equipment (FBE).

[0008] Therefore, the present disclosure relates to a terminal and a wireless communication method capable of appropriately controlling wireless communication in an NR-U system. 、 base station and systems One of the aims is to provide. [Means for solving the problem]

[0009] A terminal according to an embodiment of the present disclosure includes a receiver that receives a Radio Resource Control information element (RRC IE) including first information indicating a period of a 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 controller that controls the initiative of the PCO based on the RRC IE. The period is any one of 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms. It is characterized by: Effect of the Invention

[0010] According to one aspect of the present disclosure, it is possible to appropriately control wireless communication in an NR-U system. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of base station-led COT in Rel.16. [Diagram 2] FIG. 2 is a diagram showing an example of UE-initiated COT. [Diagram 3] FIG. 3 is a diagram showing another example of UE-initiated COT. [Figure 4] FIG. 4 is a diagram showing another example of UE-initiated COT. [Diagram 5] FIG. 5 is a diagram showing another example of UE-initiated COT. [Figure 6] FIG. 6 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 9] FIG. 9 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

[0015] In the present disclosure, higher layer signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like.

[0016] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0017] The physical layer signaling may be, for example, Downlink Control Information (DCI).

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

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

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

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

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

[0023] Priority may be set for a signal (e.g., UCI such as HARQ-ACK, reference signal, etc.), a channel (PDSCH, PUSCH, etc.), a HARQ-ACK codebook, etc. Priority may 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 types of priority may be set. Information related to priority may be notified from the base station to the UE using at least one of higher layer signaling and DCI.

[0024] 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. When setting the priority for the PDSCH, the priority of the PDSCH may be read as the priority of the HARQ-ACK for the PDSCH.

[0025] The UE may control UL transmissions based on priority when different UL signals / UL channels collide, for example by performing high priority UL transmissions and not performing (e.g., dropping) low priority UL transmissions, or by changing (e.g., postponing or shifting) the transmission timing of low priority UL transmissions.

[0026] Different UL signals / UL channels collide when their time resources (or time and frequency resources) overlap, or when their transmission timings overlap.

[0027] When the priority is notified using DCI, the base station may notify or set to the UE using higher layer signaling whether or not a bit field (e.g., priority indicator) for notifying the priority is set in the DCI. In addition, when the bit field for notifying the priority is not included in the DCI, the UE may determine that the priority of the PDSCH (or the HARQ-ACK corresponding to the PDSCH) scheduled in the DCI is a specific priority (e.g., low).

[0028] (Unlicensed band) In unlicensed bands (e.g., the 2.4 GHz band, the 5 GHz band, the 6 GHz band, etc.), it is expected that multiple systems, such as Wi-Fi systems and systems that support Licensed-Assisted Access (LAA) (LAA systems), will coexist, and it is considered that collision avoidance and / or interference control of transmissions between these multiple systems will be necessary.

[0029] In LAA of existing LTE systems (e.g., Rel. 13), a data transmitting device listens to check whether or not other devices (e.g., base stations, user terminals, Wi-Fi devices, etc.) are transmitting data before transmitting data in an unlicensed band. This listening may be called Listen Before Talk (LBT), Clear Channel Assessment (CCA), carrier sense, channel sensing, sensing, channel access procedure, shared spectrum channel access procedure, energy detection (ED), etc.

[0030] The transmitting device may be, for example, a base station (e.g., gNodeB (gNB) or may be called a network (NW)) in the downlink (DL) and a user equipment (UE) in the uplink (UL). Also, a receiving device that receives data from the transmitting device may be, for example, a user equipment in the DL and a base station (NW) in the UL.

[0031] In the LAA of the existing LTE system, the transmitting device starts data transmission a predetermined period (e.g., immediately after or during a backoff period) after it is detected in the LBT that no other devices are transmitting (idle state).

[0032] The use of unlicensed bands is also being considered for future wireless communication systems (e.g., 5G, 5G+, New Radio (NR), 3GPP Rel. 15 and later, etc.). An NR system that uses unlicensed bands may be called an NR-Unlicensed (U) system, an NR LAA system, etc.

[0033] Dual connectivity (DC) between licensed bands and unlicensed bands, and stand-alone (SA) of unlicensed bands may also be included in NR-U.

[0034] In order to coexist with other systems or other operators, nodes in NR-U (e.g., base stations, UEs) confirm that the channel is idle using LBT before starting transmission.

[0035] In NR-U, a base station (e.g., gNB) or a UE acquires a transmission opportunity (Transmission Opportunity (TxOP)) and transmits when the LBT result is idle. A base station or a UE does not transmit when the LBT result is busy (LBT-busy). The time of the transmission opportunity may be called a channel occupancy time (COT).

[0036] Note that LBT-idle may be interpreted as LBT success, and LBT-busy may be interpreted as LBT failure.

[0037] (FBE / LBE) In future wireless communication systems (e.g., NR after Rel. 16), it is considered that UE performs LBT based on multiple LBT types. As the mechanism of the LBT, frame-based equipment (FBE) or load-based equipment (LBE) may be used.

[0038] FBE may refer to an LBT mechanism that has a fixed frame period, performs sensing using some of the resources, transmits if the channel is available, and waits until the next sensing timing without transmitting if the channel is unavailable.

[0039] In NR after Rel.16, when a specific higher layer parameter (e.g., ChannelAccessMode-r16) is provided to the UE and the specific higher layer parameter satisfies a specific condition (e.g., ChannelAccessMode-r16=semistatic), the NW and the UE may perform LBT based on FBE. LBT based on FBE may be called semistatic LBT.

[0040] On the other hand, LBE may refer to an LBT mechanism in which, if a sensing result indicates that a channel is unavailable, the sensing period is extended and sensing is continued until the channel becomes available.

[0041] In NR Rel.16 and later, when a specific higher layer parameter (e.g., ChannelAccessMode-r16) is provided to the UE and the specific higher layer parameter satisfies a specific condition (e.g., ChannelAccessMode-r16=dynamic is set or ChannelAccessMode-r16 is not specified), the NW and the UE may perform LBT based on LBE.

[0042] The LBT based on the LBE may be called a dynamic LBT. The LBT based on the LBE may be distinguished by the type of the LBT. The type of the LBT may be called a channel access type, a channel access mode, a shared channel access type, etc.

[0043] In NR Rel. 16 and later, channel access types may be classified into any of Type 1, Type 2A, Type 2B, and Type 2C.

[0044] The names of the channel access types are not limited to these. For example, the names of the channel access types may be "channel access type X" where X is represented by any number, alphabet, or combination of numbers and alphabet, or may be other names.

[0045] Type 1 channel access may be a channel access with a variable transmission waiting time (contention window size (CWS)) with random back-off. Type 1 channel access may be a channel access type used in a coexistence environment with other unlicensed bands (e.g., Wi-fi).

[0046] In type 1 channel access, a terminal (including terminals in other wireless communication standards) / gNB may perform sensing during a specific period before transmitting a signal. The specific period may be composed of at least an extension period (which may be called a defer duration, e.g., 43 μs) and a sensing slot (e.g., 9 μs).

[0047] In type 1 channel access, a specific counter (timer) may be set for the terminal / gNB, and when the counter expires (counter value = 0), signal transmission may be permitted.

[0048] The counter may be decremented every time one sensing slot (e.g., 9 μs) elapses. The counter set in the terminal / gNB may be stopped during a specific period (the period during which the signal is transmitted) when a transmission of a signal by a terminal / gNB other than the terminal / gNB is detected (the LBT is busy). The counter may be restarted after the specific period (the period during which the signal is transmitted) has elapsed.

[0049] If the counter values ​​set in multiple terminals / gNBs at a certain moment become 0 and the signal transmissions of the multiple terminals / gNBs overlap, the CWS of the terminals may be extended.

[0050] Type 2A channel access may be channel access without random backoff. In type 2A channel access, a first period including a period during which sensing is performed (for example, a period of 25 μs (which may be called a sensing interval, gap, etc.)) is set for the UE, and the UE may perform sensing during the period. If the UE is in LBT idle during the sensing, the UE may transmit a signal immediately after the period has elapsed.

[0051] The type 2B channel access may be a channel access without random backoff. In the type 2B channel access, a second period (e.g., a period of 16 μs) including a period during which sensing is performed is set for the UE, and the UE may perform sensing during the period. If the UE is in LBT idle during the sensing, the UE may transmit a signal immediately after the period has elapsed.

[0052] The type 2C channel access may be a channel access in which a period equal to or less than the first period or the second period (e.g., 16 μs) is set for the UE, but sensing is not performed during the period. The UE may transmit a signal during a predetermined period (e.g., a maximum period of 584 μs) immediately after the period.

[0053] A cyclic prefix (CP) extension may be configured to control the period during which sensing is performed for each type of channel access. The CP extension may be indicated at a specific time, which corresponds to a CP extension index. The specific time is T TA When the timing advance is 25μs, 16+T TA μs, 25+T TA It may be at least one of μs.

[0054] The UE may receive information regarding the channel access type and the indication of the CP extension based on at least one of higher layer signaling and physical layer signaling.

[0055] In LBT based on FBE before Rel.16, the base station and UE transmit and receive uplink (UL) / downlink (DL) signals / channels using base station-initiated (gNB-initiated) COT. The base station-initiated COT may be a COT obtained as a result of sensing by a base station (NW).

[0056] Prior to Rel. 16, the base station initiated COT may be contained within a Fixed Frame Period (FFP), which may also be called Periodic Channel Occupancy (PCO). The start of the FFP for every two consecutive radio frames may be aligned with the start of a particular (e.g., even-indexed) radio frame.

[0057] The period of the FFP may be set / informed to the UE by higher layer signaling. The higher layer signaling may be System Information Block 1 (SIB1) signaling / RRC signaling. The higher layer parameter set / informed by the higher layer signaling may be SemiStaticChannelAccessConfig. The period may be determined from, for example, 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms.

[0058] FIG. 1 is a diagram showing an example of base station-led COT in Rel. 16. The base station (gNB) performs sensing in a specific period (which may be called a sensing slot, for example) 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).

[0059] If the sensing result is a success in the LBT, the gNB acquires a COT (gNB-initiated COT). The COT is included in the FFP (here, a period of 10 ms), and the start position of the COT aligns with the start position of the FFP. The start position of the FFP aligns with the start positions of each radio frame (here, frame #0 and frame #1). The gNB transmits DL signals / channels and UL signals / channels in the acquired COT.

[0060] In addition, in gNB-initiated COT, the gNB may transmit DL signals / channels first. In other words, in gNB-initiated COT, the UE may receive DL signals / channels first.

[0061] Incidentally, in future wireless communication systems (e.g., NR after Rel. 17), in order to further advance highly reliable and low latency communications (e.g., traffic types such as URLLC), the introduction of UE-initiated COT for FBE is being considered. However, there has been insufficient consideration of the UE-initiated COT.

[0062] Specifically, the start position and cycle (period) of the FFP for UE-driven COT have not been sufficiently considered, and the method of setting / instructing UE-driven COT (e.g., cell-specific or UE-specific setting / instruction, common to all UL signals / channels, or setting / instruction for each UL signal / channel) has not been sufficiently considered.

[0063] If such considerations are not sufficient, there is a risk of reduced throughput or degradation of communication quality when operating traffic types such as URLLC in an NR-U system.

[0064] Therefore, the inventors have come up with a method for configuring an FFP including a UE-initiated COT when operating a traffic type such as URLLC in an NR-U system.

[0065] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0066] In the present disclosure, “A / B” may be interpreted as at least one of A and B, and “A / B / C” may be interpreted as at least one of A, B, and C.

[0067] In this disclosure, the gNB-initiated COT may be referred to as the first COT, the quasi-static COT in FBE, etc. Also, in this disclosure, the FFP for the gNB-initiated COT may be referred to as the FFP for the first COT, the FFP included in the first COT, the first FFP, the FFP for the quasi-static COT in FBE, etc.

[0068] In this disclosure, the UE-initiated COT may be referred to as a second COT, a dynamic COT in FBE, etc. Also, in this disclosure, the FFP for the UE-initiated COT may be referred to as an FFP for the second COT, an FFP included in the second COT, a second FFP, an FFP for the dynamic COT in FBE, etc.

[0069] (Wireless communication method) <First embodiment> In the first embodiment, the start position and cycle (period) of the second FFP will be described. The start position and cycle (period) of the second FFP may be determined according to at least one of the following embodiments 1-1 to 1-4.

[0070] [Embodiment 1-1] The start position and period (duration) of the second FFP may be determined based on the first FFP. For example, the start position and period of the second FFP in a specific period (e.g., a specific frame) may be the same as the start position and period of the first FFP in the specific period. In other words, the UE may transmit and receive signals / channels in a COT included in the second FFP that has the same start position and period as the first FFP.

[0071] In this case, the starting position of the second FFP for every N (eg, N=2) consecutive radio frames may be aligned with the starting position of a specific (eg, having an even index) radio frame.

[0072] Also, information regarding the duration of the second FFP may be configured / notified to the UE by higher layer parameters (e.g., SemiStaticChannelAccessConfig) through higher layer signaling (SIB1 signaling / RRC signaling). The duration may be determined from among 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms, or may be expressed as an integer multiple of a specific period (e.g., slot, subslot, symbol, subframe), or may be expressed as an arbitrary time.

[0073] The UE may also receive information regarding the duration of the second FFP based on a specific field included in the DCI scheduling the transmission of the UL signal / channel in the second COT, which may be the DCI included in the first COT.

[0074] The UE may also be notified / configured with a set (list) of information on the duration of the second FFP by higher layer signaling. The UE may then select (determine) information on the duration of the second FFP to be applied to the second COT from the set 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 be the DCI included in the first COT.

[0075] FIG. 2 is a diagram showing an example of UE-initiated COT. In the example of FIG. 2, a first FFP (FFP for gNB-initiated COT) is included in frame #0 and frame #1, and a second FFP (FFP for UE-initiated COT) is included in frame #2 and frame #3. The first FFP in frame #0 and frame #1 of FIG. 2 is the same as that in FIG. 1. The gNB may also acquire the first COT in frame #2 and frame #3, and the first FFP in frame #2 and frame #3 may be the same as the first FFP in frame #0 and frame #1.

[0076] In the example shown in Fig. 2, the cycle (period) of the first FFP is set to 10 ms. The cycle (period) of the second FFP in Fig. 2 is also set to 10 ms.

[0077] The UE performs channel sensing in a specific period immediately before frame #2 and in a specific period immediately before frame #3. If the sensing is successful, the UE may transmit / receive signals / channels immediately thereafter. After transmitting / receiving the signals / channels, the UE may perform channel sensing after a specific idle period.

[0078] In the present disclosure, in the UE-initiated COT, the UE may transmit a UL signal / channel first. For example, the UE may set the UL (or schedule the UL transmission) to the first symbol of the UE-initiated COT.

[0079] In the present disclosure, whether the UE takes the lead in COT may be determined for transmission of UL signals / channels (e.g., at least one of CG-PUSCH, SR, and PRACH) that depend on the internal status of the UE. For transmission of channels other than the UL signals / channels, the UE may take the lead in COT based on the setting / instruction by the base station.

[0080] In the diagram showing the configuration of the COT of the present disclosure, the lengths and arrangements of the FFP, COT, radio frames, and periods used for transmitting and receiving signals / channels are merely examples and are not limited to these. For example, the number of frames in which the first COT is set and the number of frames in which the second COT is set may be the same or different.

[0081] According to embodiment 1-1, no new settings / configurations need to be added to the UE, and implementation in the UE can be simplified.

[0082] [Embodiment 1-2] The start position of the second FFP may be determined based on the first FFP. For example, the start position of the second FFP may be the same as the start position of the first FFP. In other words, the UE may transmit and receive signals / channels in the COT included in the second FFP that has the same start position as the first FFP.

[0083] In this case, the starting position of the second FFP for every N consecutive radio frames (eg, N=2) may be aligned with the starting position of a specific radio frame (eg, having an even index).

[0084] At this time, information on the period of the second FFP may be configured / notified to the UE by a parameter (e.g., a parameter other than SemiStaticChannelAccessConfig) other than a specific upper layer parameter by upper layer signaling (SIB1 signaling / RRC signaling). The period may be determined from among 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms, or may be expressed as an integer multiple of a specific period (e.g., a slot, a subslot, a symbol, a subframe), or may be expressed as an arbitrary time. The period may be a value different from the period of the first FFP, which is configured by a specific upper layer parameter (e.g., SemiStaticChannelAccessConfig).

[0085] FIG. 3 is a diagram showing another example of UE-initiated COT. In the example of FIG. 3, a first FFP (FFP for gNB-initiated COT) is included in frame #0 and frame #1, and a second FFP (FFP for UE-initiated COT) is included in frame #2 and frame #3. The first FFP in FIG. 3 is the same as that in FIG. 2.

[0086] In the example shown in FIG. 3, the UE is set to a period (duration) of the second FFP to 5 ms by a specific higher layer parameter. The UE performs channel sensing in a specific period immediately before the start of each FFP included in frame #2 and frame #3. If the sensing is successful, the UE may transmit / receive a signal / channel immediately thereafter. After transmitting / receiving the signal / channel, the UE may perform channel sensing after a specific idle period.

[0087] According to embodiment 1-2, more flexible transmission and reception of UL signals / channels becomes possible, and higher communication reliability can be ensured.

[0088] [Embodiment 1-3] The period (duration) of the second FFP may be determined based on the first FFP. For example, the period (duration) of the second FFP may be the same as the period of the first FFP. In other words, the UE may transmit and receive signals / channels in a COT included in the second FFP, which has the same period as the first FFP.

[0089] In this case, the starting position of the second FFP for each of N consecutive radio frames (eg, N=2) may not be aligned with the starting position of a specific radio frame (eg, having an even index).

[0090] At this time, information regarding the start position of the second FFP may be configured / notified to the UE by a specific higher layer parameter by higher layer signaling (SIB1 signaling / RRC signaling). The specific higher layer parameter may be information indicating a time (offset) from a specific reference point (e.g., the start position of a certain radio frame) to the start position of the second FFP. The offset may be determined from a value such as 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, etc., or may be expressed as an integer multiple of a specific period (e.g., slot, subslot, symbol, subframe), or may be expressed as an arbitrary time.

[0091] The UE may also receive information regarding the starting position of the second FFP based on a specific field included in the DCI scheduling the transmission of the UL signal / channel in the second COT, which may be the DCI included in the first COT.

[0092] The UE may also be notified / configured with a set (list) of information on the starting position of the second FFP by higher layer signaling. The UE may then select (determine) information on the starting position of the second FFP to be applied to the second COT from the set 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 be the DCI included in the first COT.

[0093] The first to third embodiments may be applied when the gNB fails the LBT in the FFP included in a certain radio frame. That is, the UE may determine whether to acquire the second COT based on the success / failure of the LBT by the gNB. Also, the first to third embodiments may be applied regardless of the success / failure of the LBT by the gNB.

[0094] The UE may implicitly determine that the LBT by the gNB has failed. For example, if the UE does not receive a DL signal / channel from the gNB in ​​a certain frame, the UE may determine that the LBT by the gNB has failed. When the UE determines in this way, the UE may control to acquire a second COT after a certain period (offset) from the start position of the certain frame.

[0095] The gNB may implicitly determine that the LBT by the UE has failed. For example, if the gNB does not receive a UE signal / channel from the UE in the second COT in a certain frame, the gNB may determine that the LBT by the UE has failed. When the gNB determines in this way, the gNB may control to acquire the first COT at the start position of the next frame of the certain frame.

[0096] FIG. 4 is a diagram showing another example of UE-initiated COT. In the example of FIG. 4, a first FFP (FFP for gNB-initiated COT) is included in frame #0, and a second FFP (FFP for UE-initiated COT) is included in frames 1, 2, and 3. The first FFP in FIG. 4 is the same as that in FIG. 2.

[0097] In the example shown in FIG. 4, the UE is configured / informed of an offset (5 ms here) of the start position of the second FFP by a specific higher layer parameter (information on the start position of the second FFP). The UE acquires the second COT 0.5 ms after the start position of frame #1. The period of the second FFP is the same as that of the first FFP (10 ms here). The UE performs channel sensing in a specific period immediately before the start of the second COT. If the sensing is successful, the UE may transmit / receive a signal / channel immediately thereafter. After transmitting / receiving the signal / channel, the UE may perform channel sensing after a specific idle period.

[0098] In the example shown in Fig. 4, the period (duration) of the second FFP may be the same as the period (duration) of the first FFP. Information on the period of the second FFP may be configured / notified to the UE by a higher layer parameter (e.g., SemiStaticChannelAccessConfig) by higher layer signaling (SIB1 signaling / RRC signaling). The period may be determined from among, for example, 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms, or may be expressed as an integer multiple of a specific period (e.g., slot, subslot, symbol, subframe), or may be expressed as an arbitrary time.

[0099] According to embodiments 1-3, it becomes possible to resume communication more quickly after LBT failure by UE / gNB.

[0100] [Embodiment 1-4] The start position and period (duration) of the second FFP may be determined independently of the first FFP. For example, the start position and period of the second FFP may be different from the start position and period of the first FFP. In other words, the UE may transmit and receive signals / channels in a COT included in the second FFP, which has a start position and period different from the first FFP.

[0101] In this case, the starting position of the second FFP for each of N consecutive radio frames (eg, N=2) may not be aligned with the starting position of a specific radio frame (eg, having an even index).

[0102] At this time, information regarding the start position of the second FFP may be configured / notified to the UE by a specific higher layer parameter by higher layer signaling (SIB1 signaling / RRC signaling). The specific higher layer parameter may be information indicating an offset from the start position of a certain radio frame. The offset may be determined from a value such as 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, etc., or may be expressed as an integer multiple of a specific period (e.g., slot, subslot, symbol, subframe), or may be expressed as an arbitrary time.

[0103] The UE may also receive information regarding the starting position of the second FFP based on a specific field included in the DCI scheduling the transmission of the UL signal / channel in the second COT, which may be the DCI included in the first COT.

[0104] The UE may also be notified / configured with a set (list) of information on the starting position of the second FFP by higher layer signaling. The UE may then select (determine) information on the starting position of the second FFP to be applied to the second COT from the set 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 be the DCI included in the first COT.

[0105] At this time, information on the period of the second FFP may be configured / notified to the UE by a parameter (e.g., a parameter other than SemiStaticChannelAccessConfig) other than a specific upper layer parameter by upper layer signaling (SIB1 signaling / RRC signaling). The period may be determined from among 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms, or may be expressed as an integer multiple of a specific period (e.g., a slot, a subslot, a symbol, a subframe), or may be expressed as an arbitrary time. The period may be a value different from the period of the first FFP, which is configured by a specific upper layer parameter (e.g., SemiStaticChannelAccessConfig).

[0106] The UE may also receive information regarding the duration of the second FFP based on a specific field included in the DCI scheduling the transmission of the UL signal / channel in the second COT, which may be the DCI included in the first COT.

[0107] The UE may also be notified / configured with a set (list) of information on the duration of the second FFP by higher layer signaling. The UE may then select (determine) information on the duration of the second FFP to be applied to the second COT from the set 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 be the DCI included in the first COT.

[0108] The information on the start position of the second FFP and the information on the duration of the second FFP may be included in the same higher layer parameter information element. Also, the information on the start position of the second FFP and the information on the duration of the second FFP may be included in different higher layer parameter information elements. The UE may implicitly determine at least one of the information on the start position of the second FFP and the information on the duration of the second FFP from another parameter.

[0109] As in the case of the first to third embodiments, the first to fourth embodiments may be applied when the gNB fails the LBT in the FFP included in a certain radio frame. That is, the UE may determine whether to acquire the second COT based on the success / failure of the LBT by the gNB. Also, the first to third embodiments may be applied regardless of the success / failure of the LBT by the gNB.

[0110] The UE may implicitly determine that the LBT by the gNB has failed. For example, if the UE does not receive a DL signal / channel from the gNB in ​​a certain frame, the UE may determine that the LBT by the gNB has failed. When the UE determines in this way, the UE may control to acquire a second COT after a certain period (offset) from the start position of the certain frame.

[0111] The gNB may implicitly determine that the LBT by the UE has failed. For example, if the gNB does not receive a UE signal / channel from the UE in the second COT in a certain frame, the gNB may determine that the LBT by the UE has failed. When the gNB determines in this way, the gNB may control to acquire the first COT at the start position of the next frame of the certain frame.

[0112] FIG. 5 is a diagram showing another example of UE-initiated COT. In the example of FIG. 5, a first FFP (FFP for gNB-initiated COT) is included in frame #0, and a second FFP (FFP for UE-initiated COT) is included in frame #1. The first FFP in FIG. 5 is the same as that in FIG. 2.

[0113] In the example shown in FIG. 5, the UE is configured / informed of an offset (here, 0.5 ms) of the start position of the second FFP by a specific higher layer parameter (information on the start position of the second FFP). Also, the UE is configured / informed of a period (period, here, 2.5 ms) of the second FFP by a specific higher layer parameter (information on the period of the second FFP). The UE acquires the second COT 0.5 ms after the start 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 successful, the UE may transmit / receive a signal / channel immediately thereafter. The UE may perform channel sensing after a specific idle period after transmitting / receiving the signal / channel.

[0114] According to embodiments 1 to 4, more flexible transmission and reception of UL signals / channels becomes possible, making it possible to ensure higher communication reliability, and making it possible to resume communication more quickly after LBT failure by UE / gNB.

[0115] As described above, according to the first embodiment, an appropriate UE-initiated COT can be configured.

[0116] <Second embodiment> In the second embodiment, a method of applying the second COT to the UL signal / channel will be described. The UE may use the second COT when transmitting the UL signal / channel according to at least one of the following embodiments 2-1 and 2-2. The operation of the second COT may be any of the methods shown in the first embodiment.

[0117] [Embodiment 2-1] The UE may set a second COT commonly to multiple (eg, all) UL signals / channels and transmit the UL signals / channels.

[0118] The multiple UL signals / channels may 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.

[0119] At this time, information regarding the start position of the second FFP (COT) and information regarding the periodicity of the second FFP (COT) may be notified / configured to the UE by higher layer signaling (eg, SIB1 signaling / RRC signaling).

[0120] According to embodiment 2-1, a UE-initiated COT can be set commonly for multiple UL signals / channels, and an increase in signaling overhead can be suppressed.

[0121] [Embodiment 2-2] The UE may set a second COT independently for each UL signal / channel and transmit the UL signal / channel.

[0122] The UL signal / channel may be at least one of PUCCH, PUSCH, PRACH, and SRS, which are set by higher layer parameters. In this case, at least one of information on the start position of the second FFP (COT) and information on the period of the second FFP (COT) may be notified / set to the UE by higher layer signaling (e.g., SIB1 signaling / RRC signaling).

[0123] The multiple UL signals / channels may be at least one of PUCCH, PUSCH, PRACH, and SRS triggered / scheduled by DCI. In this case, at least one of a set of information on the start position of the second FFP (COT) and a set of information on the periodicity of the second FFP (COT) is notified / configured to the UE by higher layer signaling (e.g., SIB1 signaling / RRC signaling), and the UE may determine the value of the start position / periodicity based on the value of a specific field included in the trigger / schedule DCI.

[0124] The multiple UL signals / channels may include a PUSCH scheduled by an RAR UL grant. At this time, at least one of a set of information on the start position of the second FFP (COT) and a set of information on the period of the second FFP (COT) is notified / configured to the UE by higher layer signaling (e.g., SIB1 signaling / RRC signaling), and the UE may determine the value of the start position / period based on the value of a specific field included in the RAR UL grant.

[0125] According to embodiment 2-2, the second COT can be determined for each UL signal / channel, enabling more flexible communication.

[0126] <Third embodiment> In the third embodiment, a method of applying the second COT to a plurality of UEs included in a serving cell will be described. The UE may use the second COT when transmitting a UL signal / channel according to at least one of the following embodiments 3-1 and 3-2. The operation of the second COT may be any of the methods shown in the first embodiment.

[0127] [Embodiment 3-1] The UE may set the second COT in common to a plurality of (e.g., all) UEs included in a certain serving cell and transmit a UL signal / channel. In other words, the UE may assume that information on the second FFP (COT) is notified in common to a plurality of UEs in the serving cell.

[0128] At this time, information regarding the second FFP (COT) set for the UE (e.g., at least one of information regarding the starting position of the second FFP (COT) and information regarding the periodicity of the second FFP (COT)) may be notified to the UE by higher layer signaling (e.g., SIB1 signaling / RRC signaling).

[0129] Furthermore, information regarding the second FFP (COT) configured for the UE may be indicated to the UE by physical layer signaling (for example, a group-common PDCCH).

[0130] According to embodiment 3-1, a UE-initiated COT can be set commonly for multiple UEs included in a serving cell, and an increase in signaling overhead can be suppressed.

[0131] [Embodiment 3-2] The UE may set the second COT for each UE included in a serving cell and transmit the UL signal / channel. In other words, the UE may assume that information on the second FFP (COT) is notified for each UE in the serving cell.

[0132] At this time, information regarding the second FFP (COT) set for the UE (e.g., at least one of information regarding the starting position of the second FFP (COT) and information regarding the periodicity of the second FFP (COT)) may be notified / configured / instructed to the UE by higher layer signaling (e.g., RRC signaling) and physical layer signaling (e.g., DCI).

[0133] According to embodiment 3-2, the second COT can be determined for each UE included in the serving cell, enabling more flexible communication.

[0134] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0135] 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0136] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0137] 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.

[0138] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0139] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0140] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0141] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0142] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0143] A plurality of base stations (e.g., RRH) 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and base station 12 corresponding to a relay station (relay) may be called an IAB node.

[0144] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0145] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0146] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0147] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0148] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0149] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0150] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0151] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0152] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0153] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0154] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0155] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0156] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0157] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0158] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0159] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0160] (base station) 7 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0161] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0162] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0163] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0164] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0165] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0166] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0167] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0168] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0169] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0170] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0171] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0172] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0173] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0174] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0175] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0176] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0177] The transceiver 120 may transmit information about a channel occupation time (COT) in a semi-static channel access procedure. The controller 110 may control reception of an uplink channel in the COT initiated based on the information about the COT (first embodiment).

[0178] (User terminal) 8 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0179] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0180] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0181] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0182] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0183] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0184] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0185] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0186] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0187] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0188] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0189] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0190] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0191] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0192] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0193] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0194] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0195] The transceiver 220 may receive information about a channel occupation time (COT) in a semi-static channel access procedure. The controller 210 may control the initiative of the COT based on the information about the COT (first embodiment).

[0196] The information about the COT may be at least one of information about a start position of a periodic channel occupation (PCO) including the COT and information about a period of the PCO including the COT (first embodiment).

[0197] The control unit 210 may control the initiative of the COT in common for a plurality of uplink (UL) channels or independently for each UL channel (second embodiment).

[0198] The control unit 210 may assume that the information on the COT is notified commonly to a plurality of terminals in a serving cell, or independently to each terminal in the serving cell (third embodiment).

[0199] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0200] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0201] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0202] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0203] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0204] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0205] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0206] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0207] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0208] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0209] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0210] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0211] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0212] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0213] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0214] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0215] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0216] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0217] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0218] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0219] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0220] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0221] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0222] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0223] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0224] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0225] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0226] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0227] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0228] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0229] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0230] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0231] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0232] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0233] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0234] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0235] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0236] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0237] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0238] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0239] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0240] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0241] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0242] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0243] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0244] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0245] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0246] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0247] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0248] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0249] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0250] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0251] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0252] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0253] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0254] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0255] Each aspect / embodiment described in the present disclosure may be applied to a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication method, or a next-generation system extended based on these. In addition, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

[0256] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0257] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0258] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0259] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0260] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0261] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0262] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0263] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0264] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0265] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0266] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0267] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiving unit for receiving a Radio Resource Control information element (RRC IE) including first information indicating a periodic channel occupancy (PCO) period and second information indicating an offset from a start position of a specific radio frame to a start position of the PCO; A control unit that controls the initiative of the PCO based on the RRC IE, A terminal in which the period is any one of 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms.

2. The terminal of claim 1 , wherein the particular radio frame is a radio frame having an even index.

3. The terminal according to claim 1 , wherein the terminal-initiated PCO and the base station-initiated PCO are configured independently.

4. receiving a Radio Resource Control information element (RRC IE) including first information indicating a periodic channel occupancy (PCO) period and second information indicating an offset from a start of a particular radio frame to a start of the PCO; and controlling the initiative of the PCO based on the RRC IE; A wireless communication method for a terminal, wherein the period is any one of 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms.

5. a transmitter for transmitting a Radio Resource Control information element (RRC IE) including first information indicating a period of a 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; A control unit that determines that the PCO is initiated by a terminal based on the RRC IE, A base station, wherein the period is any one of 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms.

6. A system having a terminal and a base station, The terminal includes: a receiving unit for receiving a Radio Resource Control information element (RRC IE) including first information indicating a periodic channel occupancy (PCO) period and second information indicating an offset from a start position of a specific radio frame to a start position of the PCO; A control unit that controls the initiative of the PCO based on the RRC IE, The period is any one of 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms; The base station, A system comprising a transmitter for transmitting the RRC IE.

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