阅读说明：本技术 用户终端以及无线通信方法 (User terminal and wireless communication method ) 是由 武田一树 永田聪 王理惠 于 2019-01-10 设计创作，主要内容包括：本公开的一方式的用户终端的特征在于,包括：控制单元,在被设定了从与第一子载波间隔(SubCarrier Spacing(SCS))对应的载波到与第二SCS对应的载波的跨载波调度的情况下,基于通过与所述第一SCS对应的载波而被调度的下行链路小区的数目,决定用于所述第一SCS的被监视的下行控制信道(物理下行链路控制信道(PDCCH：Physical Downlink Control Channel))候选的最大数以及不重叠的控制信道元素(Control Channel Element(CCE))的最大数；以及接收单元,基于所述PDCCH候选的最大数以及所述不重叠的CCE的最大数,在与所述第一SCS对应的载波中监视PDCCH候选。(A user terminal according to an aspect of the present disclosure is characterized by including: a Control unit configured to determine, when cross-carrier scheduling is set from a carrier corresponding to a first SubCarrier Spacing (SCS) to a carrier corresponding to a second SCS, a maximum number of monitored Downlink Control Channel (Physical Downlink Control Channel) candidates for the first SCS and a maximum number of non-overlapping Control Channel Elements (CCEs) based on the number of Downlink cells scheduled by the carrier corresponding to the first SCS; and a receiving unit that monitors the PDCCH candidates in a carrier corresponding to the first SCS based on the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs.)

1. A user terminal, comprising:

a Control unit configured to determine, when cross-carrier scheduling is set from a carrier corresponding to a first SCS (sub carrier spacing), which is a first subcarrier spacing, to a carrier corresponding to a second SCS, a maximum number of monitored Downlink Control Channel (PDCCH) candidates for the first SCS and a maximum number of non-overlapping Control Channel Elements (CCEs) based on the number of Downlink cells scheduled by the carrier corresponding to the first SCS; and

a receiving unit that monitors PDCCH candidates in a carrier corresponding to the first SCS based on the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs.

2. The user terminal of claim 1,

the control unit may consider μ as SCS of a scheduling cell and N as N in a calculation formula of the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs^DL，μ _cellsThe number of downlink cells scheduled from a carrier corresponding to the first SCS among the downlink cells assumed to be set.

3. A wireless communication method for a user terminal, comprising:

a step of determining, when cross-carrier scheduling is set from a carrier corresponding to a first SCS (sub carrier spacing) that is a first subcarrier interval to a carrier corresponding to a second SCS, a maximum number of monitored Downlink Control Channel (PDCCH) candidates for the first SCS and a maximum number of non-overlapping Control Channel Elements (CCEs) based on the number of Downlink cells scheduled by the carrier corresponding to the first SCS; and

monitoring PDCCH candidates in a carrier corresponding to the first SCS based on the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs.

Technical Field

The present disclosure relates to a user terminal and a wireless communication method in a next generation mobile communication system.

Background

In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like (non-patent document 1). In addition, LTE-Advanced (3GPP rel.10-14) is standardized for the purpose of further large capacity, Advanced, and the like of LTE (Third Generation Partnership Project (3GPP)) versions (Release (Rel.))8, 9).

Successor systems to LTE (e.g., also referred to as a 5th generation mobile communication system (5G)), 5G + (plus), New Radio (NR), 3GPP rel.15 and beyond) are also being studied.

Documents of the prior art

Non-patent document

Non-patent document 13 GPP TS 36.300 V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In NR, use of Cross-Carrier Scheduling (CCS) for Scheduling transmission or reception of other carriers by Downlink Control Information (DCI) received in a certain Carrier is being studied.

In NR, in order to suppress an increase in the processing load of the UE, the maximum number of Downlink Control Channel (Physical Downlink Control Channel (PDCCH)) candidates monitored in each slot of 1 serving cell, the maximum number of non-overlapping Control Channel Elements (CCEs), and the like are studied.

However, these numbers based on the current rel.15nr specification are not suitable for CCS applications that span different parameter sets. Therefore, in order to use CCS that spans different parameter sets, the downlink control channel cannot be appropriately monitored unless a more appropriate maximum number of calculation methods is explicitly specified, and there is a concern that the communication throughput may be reduced.

Therefore, an object of the present disclosure is to provide a user terminal and a wireless communication method capable of appropriately monitoring a downlink control channel even when cross-carrier scheduling spanning different parameter sets is introduced.

Means for solving the problems

A user terminal according to an aspect of the present disclosure is characterized by including: a Control unit configured to determine, when cross-carrier scheduling is set from a carrier corresponding to a first SubCarrier Spacing (SCS) to a carrier corresponding to a second SCS, a maximum number of monitored Downlink Control Channel (Physical Downlink Control Channel) candidates for the first SCS and a maximum number of non-overlapping Control Channel Elements (CCEs) based on the number of Downlink cells scheduled by the carrier corresponding to the first SCS; and a receiving unit that monitors the PDCCH candidates in a carrier corresponding to the first SCS based on the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs.

Effects of the invention

According to an aspect of the present disclosure, even when cross-carrier scheduling spanning different parameter sets is introduced, monitoring of a downlink control channel can be appropriately performed.

Drawings

Fig. 1A and 1B are diagrams showing an example of the number of BD times in CA by a conventional calculation method.

Fig. 2A and 2B are diagrams showing an example of the number of times of BD at the time of CA based on the calculation method in the embodiment of the present disclosure.

Fig. 3A and 3B are diagrams showing another example of the number of times of BD at the time of CA based on the calculation method in one embodiment of the present disclosure.

Fig. 4 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 5 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 6 is a diagram showing an example of the configuration of a user terminal according to an embodiment.

Fig. 7 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

In NR, use of Cross-Carrier Scheduling (CCS) for Scheduling transmission or reception of other carriers by Downlink Control Information (DCI) received in a certain Carrier is being studied.

The CCS from the first carrier to the second carrier may be applied to the UE settings using higher layer signaling. For example, higher layer signaling may be used to set a relationship between a Carrier Indication Field (CIF) included in DCI and a corresponding CCS (scheduled cell Carrier).

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

For example, the MAC signaling may use a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), and the like. For example, the broadcast Information may be a Master Information Block (MIB), a System Information Block (SIB), Minimum System Information (Remaining Minimum System Information (RMSI)), Other System Information (OSI)), or the like.

Further, in NR, it is required to apply a plurality of parameter sets to control communication. For example, in NR, it is assumed that a plurality of SubCarrier Spacing (SCS) is applied to transmission and reception based on a frequency band or the like. SCS used for NR includes 15kHz, 30kHz, 60kHz, 120kHz, 240kHz and the like. Needless to say, the applicable SCS is not limited thereto.

In addition, a parameter set (SCS) may be associated with a particular index μ. For example, μ ═ 0 may mean SCS 15kHz, μ ═ 1 may mean SCS 30kHz, μ ═ 2 may mean SCS 60kHz, and μ ═ 3 may mean SCS 120 kHz. These values are merely examples, and the values are not limited thereto.

In NR, in order to suppress an increase in processing load of the UE, etc., the maximum number of times of Decoding (e.g., Blind Decoding (BD)) performed by the UE per slot of 1 serving cell is being studied. The maximum number of BDs may be replaced with the maximum number of PDCCH candidates monitored by the UE, the upper limit of the number of BDs, or the like.

Also, for the same reason, the maximum number of non-overlapped Control Channel Elements (CCEs) per slot of 1 serving cell is being studied. The maximum number of CCEs may be replaced with an upper limit of the number of CCEs, or the like.

Maximum number of monitored PDCCH candidates M per slot of 1 serving cell^{max，slot，μ} _PDCCHMay be M^{max ，slot，0} _PDCCH44 (44 if SCS 15 kHz), M^{max，slot，1} _PDCCH36 (36 if SCS 30 kHz), M^{max ，slot，2} _PDCCH22 (if SCS 60kHz, 22), M^{max，slot，3} _PDCCH20 (20 if SCS 120 kHz). These values are merely examples, and the values are not limited thereto.

Maximum number of non-overlapping CCEs C per slot of 1 serving cell^{max，slot，μ} _PDCCHMay be C^{max ，slot，0} _PDCCH56 (if SCS 15kHz, 56), C^{max，slot，1} _PDCCH56 (56 if SCS 30 kHz), C^{max ，slot，2} _PDCCH48 (48 if SCS 60 kHz), C^{max，slot，3} _PDCCH32 (if SCS 120kHz, 32). These values are merely examples, and the values are not limited thereto.

In the non-CA (non-CA) case, the upper limit of the BD number and the upper limit of the CCE number for a Downlink Bandwidth Part (DL BWP) having SCS setting μ (for example, μ ═ 0 to 3) are respectively the above-described M^{max ，slot，μ} _PDCCHAnd C^{max，slot，μ} _PDCCH。

The UE may use the representation with monitoring for N^cap _cellsCapability information (higher layer parameter "PDCCH-binddetectionca") of the capability of PDCCH candidates of each downlink cell is reported to the base station. Here, N is^cap _cellsMay be an integer of 4 or more.

N with SCS setting mu when UE is set to DL BWP^DL，μ _cellsA downlink cell, and ∑³ _μ＝0(N^{DL ，μ} _cells) 4 or more or sigma³ _μ＝0(N^DL，μ _cells)≤N^cap _cellsIn the case of (3), the upper limit M of the number of BD used for each scheduled cell^{total ，slot，μ} _PDCCHAnd an upper limit C of the number of CCEs^{total，slot，μ} _PDCCHAre respectively M above^{max，slot，μ} _PDCCHAnd C^{max，slot，μ} _PDCCH。

In addition, N^DL，μ _cellsMay correspond to the number of configured downlink cells (which may also be referred to as Component Carriers (CCs)) including DL BWP with SCS configuration μ.

N configured at UE to include DL BWP with SCS configuration μ (e.g., μ 0 to 3)^DL，μ _cellsA downlink cell, and ∑³ _μ＝0(N^DL，μ _cells)>N^cap _cellsIn the case of DL BWP with SCS setting μ activation of scheduling cell (scheduling cell), it is not necessary to monitor ratio min (M) for each scheduled cell^{max，slot，μ} _PDCCH，M^{total，slot，μ} _PDCCH) A plurality of PDCCH candidates.

That is, in this case, the upper limit of the number of BDs per scheduled cell may be min (M)^{max，slot，μ} _PDCCH，M^{total，slot，μ} _PDCCH). In addition, the upper limit of the number of CCEs per scheduled cell may be min (C)^{max，slot，μ} _PDCCH，C^{total ，slot，μ} _PDCCH)。

[ number 1]

In this case, the amount of the solvent to be used,

fig. 1A and 1B are diagrams showing an example of the number of BD times in CA by a conventional calculation method. In this example, as shown in fig. 1A, the UE is configured with 2 DL cells (CC #0, #1) with SCS of 30kHz (μ 1) and 3 DL cells (CC #2, #3, #4) with SCS of 120kHz (μ 3). I.e. N^DL，1 _cells＝2、N^DL，3 _cells＝3。

CC #0, #2, and #4 perform self-carrier (same carrier) scheduling, respectively. CC #1 is CCs performed from CC # 0. CC #3 is CCs-directed from CC # 2.

FIG. 1B shows N with the UE^cap _cellsCorresponding BD count difference. Assuming M shown in formula 1^{max ，slot，μ} _PDCCHThe values are as described above. I.e. M^{max，slot，1} _PDCCH＝36、M^{max，slot，3} _PDCCH＝20。

In N^cap _cellsIn the case of 5, M^{total，slot，1} _PDCCH＝72、M^{total，slot，3} _PDCCH60. In N^cap _cellsIn the case of 4, M^{total，slot，1} _PDCCH＝57，M^{total，slot，3} _PDCCH＝48。

In the following examples, the upper limit of the number of CCEs can be described by replacing the upper limit of the number of BDs, and therefore, the explanation will not be repeated.

The description so far is based on the current Rel.15NR specification. However, in the conventional method for calculating the upper limit of the number of BDs/CCE, the number of BDs/CCE is obtained for each parameter set of the set DL cell, and therefore, the method is not suitable for use in CCS which spans different parameter sets. Therefore, in order to use CCS that spans different parameter sets, unless the upper limit of the more appropriate number of BDs/number of CCEs is clearly defined, PDCCH monitoring cannot be appropriately performed, and communication throughput may be reduced.

Therefore, the present applicant has conceived a method capable of determining an upper limit of an appropriate BD count/CCE count even when cross-carrier scheduling spanning different parameter sets is introduced.

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

In addition, the embodiments can be applied even in a case where cross-carrier scheduling spanning different parameter sets is not introduced (cross-carrier scheduling spanning the same parameter set is used).

(Wireless communication method)

In one embodiment, N in the existing calculation method is used^DL，μ _cellsThe definition of (1) is changed from the existing "number of configured downlink cells (CCs) including DL BWP having SCS-configured μ" to "number of configured downlink cells (CCs) of which scheduling cell has (includes) DL BWP having SCS-configured μ" (in other words, number of DL cells (scheduled cells) scheduled by any DL cell (scheduling cell) having SCS-configured μ ").

About M^{max，slot，μ} _PDCCH、M^{total，slot，μ} _PDCCH、C^{max，slot，μ} _PDCCH、C^{total，slot，μ} _PDCCHμ is calculated as a parameter set (SCS setting) of the scheduling cell. These equations may be identical in form to the equations already described. Thus, the upper limit of the BD count/CCE number can be determined for each parameter set of the scheduling cell.

Fig. 2A and 2B are diagrams showing an example of the number of times of BD at the time of CA based on the calculation method in the embodiment of the present disclosure. In this example, as in fig. 1A, the UE is configured with 2 DL cells (CC #0, #1) with SCS of 30kHz (μ 1) and 3 DL cells (CC #2, #3, #4) with SCS of 120kHz (μ 3).

On the other hand, CC #0 and #4 perform self-carrier (same carrier) scheduling, respectively. CCs is performed for CC #1, #2, and #4 from CC #0, respectively. That is, CC #2 and #3 are applied with cross-carrier scheduling across different parameter sets.

The upper limit of the number of BDs/the number of CCEs is determined by a conventional calculation method, which is similar to the result of fig. 1B, but this is not suitable.

On the other hand, according to the present embodiment, 4 cells (CC #0, #1, #2, and #3) scheduled by CC #0 correspond to the first group having SCS of 30 kHz. The 1 cell scheduled through CC #4 (CC #4) corresponds to the second group having SCS of 120 kHz.

I.e. M^{total，slot，1} _PDCCHBased on N^DL，1 _cellsFound as 4. M^{total，slot，3} _PDCCHBased on N^DL，3 _cellsFound as 1.

As a result, in N^cap _cellsIn the case of 5, M^{total，slot，1} _PDCCH＝144，M^{total，slot，3} _PDCCH20. In N^cap _cellsIn the case of 4, M^{total，slot，1} _PDCCH＝115，M^{total，slot，3} _PDCCH＝16。

Fig. 3A and 3B are diagrams showing another example of the number of times of BD at the time of CA based on the calculation method in one embodiment of the present disclosure. In this example, as in fig. 1A, the UE is configured with 2 DL cells (CC #0, #1) with SCS of 30kHz (μ 1) and 3 DL cells (CC #2, #3, #4) with SCS of 120kHz (μ 3).

On the other hand, CC #0, #2, and #4 perform self-carrier (same carrier) scheduling, respectively. CC #1 is CCs-performed from CC # 2. CC #3 is CCs-performed from CC # 0. That is, CC #1 and #3 are applied with cross-carrier scheduling spanning different sets of parameters.

According to the present embodiment, 2 cells (CC #0 and #3) scheduled by CC #0 correspond to the first group having SCS of 30 kHz. The 3 cells (CC #1, #2, #4) scheduled by CC #2 or #4 correspond to the second group having SCS of 120 kHz.

I.e. M^{total，slot，1} _PDCCHBased on N^DL，1 _cellsFound as 2. M^{total，slot，3} _PDCCHBased on N^DL，3 _cellsFound as 3.

As a result, in N^cap _cellsIn the case of 5, M^{total，slot，1} _PDCCH＝72，M^{total，slot，3} _PDCCH60. In N^cap _cellsIn the case of 4, M^{total，slot，1} _PDCCH＝57，M^{total，slot，3} _PDCCH＝48。

As can be seen from the above-described embodiment, comparing fig. 2B and 3B, even if the SCS setting set for each cell is the same, the upper limit of the BD count/CCE count is appropriately calculated from the difference in the structure of the cross-carrier scheduling.

(Wireless communication System)

Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one of the wireless communication methods of the above embodiments of the present disclosure or a combination thereof.

Fig. 4 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), New wireless (5th Generation mobile communication system New Radio (5G NR)), and the like.

In addition, the wireless communication system 1 may support Dual connection (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs)). The MR-DC may include Dual Connectivity of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity) (EN-DC), NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Slave Node (SN). In NE-DC, the base station (gNB) of NR is MN, and the base station (eNB) of LTE (E-UTRA) is SN.

The wireless communication system 1 can support Dual connection between a plurality of base stations in the same RAT (for example, Dual connection between MN and base station gNB (NN-DC) in which both SN and MN are NR) (Dual Connectivity).

The wireless communication system 1 may have a base station 11 forming a macro cell C1 having a relatively wide coverage area, and base stations 12(12a to 12C) arranged within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and user terminal 20 are not limited to the illustrated embodiments. Hereinafter, the base stations 11 and 12 are collectively referred to as the base station 10 without distinguishing them.

The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs).

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(FR 2))). Macro cell C1 may be contained in FR1 and small cell C2 may be contained in FR 2. For example, FR1 may be a frequency band below 6GHz (sub-6GHz)), and FR2 may be a frequency band above 24GHz (above-24 GHz). The frequency bands, definitions, and the like of FR1 and FR2 are not limited thereto, and for example, FR1 may correspond to a frequency band higher than FR 2.

In each CC, the user terminal 20 can perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

The plurality of base stations 10 may be connected by wire (e.g., optical fiber based Common Public Radio Interface (CPRI)), X2 Interface, or the like) or wirelessly (e.g., NR communication). For example, in the case of using NR communication as a Backhaul between the base stations 11 and 12, the base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) may be referred to as an IAB node.

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

The user terminal 20 may be a terminal supporting at least one of communication systems such as LTE, LTE-a, and 5G.

In the wireless communication system 1, a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) can be used. For example, Cyclic Prefix Orthogonal Frequency Division multiplexing (CP-OFDM), Discrete Fourier Transform Spread Orthogonal Frequency Division multiplexing (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used for at least one of the downlink (downlink) (dl) and the uplink (ul)).

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

In the radio communication system 1, as the Downlink Channel, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH))), a Broadcast Channel (Physical Broadcast Channel (PBCH))), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH))) and the like that are Shared by the user terminals 20 can be used.

In the radio communication system 1, as the Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))), a Random Access Channel (Physical Random Access Channel (PRACH)), and the like, which are Shared by the user terminals 20, can be used.

User data, higher layer control Information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may be transmitted through the PUSCH. In addition, a Master Information Block (MIB)) may be transmitted through the PBCH.

The lower layer control information may be transmitted through the PDCCH. For example, the lower layer Control Information may include Downlink Control Information (DCI)) including scheduling Information of at least one of the PDSCH and the PUSCH.

In addition, DCI scheduling PDSCH may be referred to as DL allocation, DL DCI, etc., and DCI scheduling PUSCH may be referred to as UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data and PUSCH may be replaced with UL data.

In the detection of the PDCCH, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (search space) may be utilized. CORESET corresponds to searching for DCI resources. The search space corresponds to a search region and a search method of PDCCH candidates (PDCCH candidates). 1 CORESET may be associated with 1 or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.

The 1 search space may correspond to PDCCH candidates corresponding to 1 or more aggregation levels (aggregation levels). The 1 or more search spaces may be referred to as a search space set. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may be interchanged with one another.

Uplink Control Information (UCI)) including at least one of Channel State Information (CSI), delivery ACKnowledgement Information (e.g., HARQ-ACK, which may also be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, etc.), and a Scheduling ReQuest (SR)) may be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell may be transmitted through the PRACH.

In addition, in the present disclosure, a downlink, an uplink, and the like may be represented without labeling "link". Note that the beginning of each channel may be indicated without being marked with "Physical (Physical)".

In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like can be transmitted. In the wireless communication system 1, 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), and the like may be transmitted as the DL-RS.

For example, the Synchronization Signal may be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal Block including SS (PSS, SSs) and PBCH (and DMRS for PBCH) may be referred to as an SS/PBCH Block, SS Block (ssblock (SSB)), and the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

In addition, in the wireless communication system 1, as an Uplink Reference Signal (UL-RS), a measurement Reference Signal (Sounding Reference Signal (SRS))), a demodulation Reference Signal (DMRS), and the like may be transmitted. In addition, the DMRS may be referred to as a user terminal-specific Reference Signal (UE-specific Reference Signal).

(base station)

Fig. 5 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 transmission/reception unit 120, a transmission/reception antenna 130, and a transmission line interface (transmission line interface) 140. The control unit 110, the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission line interface 140 may be provided in 1 or more number, respectively.

In this example, the functional blocks mainly representing the characteristic parts in the present embodiment are described, but it is also conceivable that the base station 10 further includes other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs overall control of the base station 10. The control unit 110 can be constituted by a controller, a control circuit, and the like explained based on common knowledge in the technical field of the present disclosure.

The control unit 110 may control generation of signals, scheduling (e.g., resource allocation, mapping), and the like. The control unit 110 can control transmission and reception, measurement, and the like using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may generate data, control information, sequence (sequence), and the like, which are transmitted as signals, and forward to the transmission and reception unit 120. The control unit 110 can perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

The transceiver 120 may include a baseband (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 transmission/reception unit 120 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

The transmitting/receiving antenna 130 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.

The transmitting and receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission/reception unit 120 may receive the uplink channel, the uplink reference signal, and the like described above.

Transmit/receive section 120 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

The transmission/reception unit 120 (transmission processing unit 1211) may perform processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (e.g., RLC retransmission Control), processing of a Medium Access Control (MAC) layer (e.g., HARQ retransmission Control), and the like on Data, Control information, and the like acquired from the Control unit 110, for example, and generate a bit string to be transmitted.

Transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-analog conversion on a bit string to be transmitted, and output a baseband signal.

The transmission/reception unit 120(RF unit 122) may perform modulation, filter processing, amplification, and the like on the baseband signal to a radio frequency band, and transmit the signal of the radio frequency band via the transmission/reception antenna 130.

On the other hand, the transmission/reception unit 120(RF unit 122) may amplify, filter, demodulate a baseband signal, and the like, a signal of a radio frequency band received by the transmission/reception antenna 130.

Transmission/reception section 120 (reception processing section 1212) may apply reception processing such as analog-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, processing of the RLC layer, and processing of the PDCP layer to the acquired baseband signal, and acquire user data.

The transmit receive unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, and the like based on the received signal. The measurement unit 123 may measure a reception Power (e.g., Reference Signal Received Power (RSRP)), a reception Quality (e.g., Reference Signal Received Quality (RSRQ)), a Signal-to-Interference plus Noise Ratio (SINR)), a Signal-to-Noise Ratio (SNR)), a Signal Strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), and the like. The measurement result may also be output to the control unit 110.

The transmission path interface 140 can transmit and receive (backhaul signaling) signals to and from devices included in the core network 30, other base stations 10, and the like, and can acquire and transmit user data (user plane data) and control plane data and the like for the user terminal 20.

In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.

In addition, the control unit 110 may perform control of setting the cross-carrier scheduling of the user terminal 20 from the carrier(s) corresponding to the first SCS to the carrier(s) corresponding to the second SCS. In this case, the control unit 110 may control the PDCCH transmitted to the user terminal 20 in consideration of the maximum number of monitored PDCCH candidates for the first SCS, which is decided based on the number of downlink cells scheduled through the carrier corresponding to the first SCS, and the maximum number of non-overlapping CCEs.

(user terminal)

Fig. 6 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 transmission/reception unit 220, and a transmission/reception antenna 230. The control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided with 1 or more antennas, respectively.

In this example, the functional blocks mainly representing the characteristic parts in the present embodiment are described, but it is also conceivable that the user terminal 20 further includes other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured by a controller, a control circuit, and the like explained based on common knowledge in the technical field of the present disclosure.

The control unit 210 may control generation of signals, mapping, and the like. The control unit 210 can control transmission and reception, measurement, and the like using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may generate data, control information, sequences, and the like transmitted as signals and forward to the transmitting and receiving unit 220.

The transceiver 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 and receiving unit 220 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting and receiving circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

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

The transmission/reception antenna 230 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.

The transmission and reception unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmitting and receiving unit 220 may transmit the uplink channel, the uplink reference signal, and the like described above.

Transmit/receive section 220 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

Transmission/reception section 220 (transmission processing section 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), and the like on data, control information, and the like acquired from control section 210, for example, and generate a bit string to be transmitted.

Transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (as necessary), IFFT processing, precoding, and digital-to-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

In addition, whether or not the DFT processing is applied may be based on the setting of transform precoding. When transform precoding is effective (enabled) for a certain channel (e.g., PUSCH), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, or may not perform DFT processing as the transmission processing otherwise.

The transmission/reception unit 220(RF unit 222) may perform modulation, filter processing, amplification, and the like on the baseband signal to a radio frequency band, and transmit the signal of the radio frequency band via the transmission/reception antenna 230.

On the other hand, the transmission/reception unit 220(RF unit 222) may amplify, filter, demodulate a baseband signal, and the like, a signal of a radio frequency band received by the transmission/reception antenna 230.

The transmitting/receiving unit 220 (receiving processing unit 2212) may apply receiving processes such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, acquire user data, and the like.

The transmit receive unit 220 (measurement unit 223) may perform measurements related to the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, and the like based on the received signal. 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), and the like. The measurement result may be output to the control unit 210.

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

In addition, in case cross-carrier scheduling is set from the carrier(s) corresponding to the first SCS to the carrier(s) corresponding to the second SCS, the control unit 210 may decide the maximum number of monitored PDCCH candidates for the first SCS and the maximum number of non-overlapping CCEs based on the number of downlink cells scheduled through the carrier corresponding to the first SCS.

The transmission/reception unit 220 may monitor (decode, etc.) PDCCH candidates in a carrier corresponding to the first SCS based on the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs.

In the calculation formula (e.g., formula 1 and formula 2) of the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs, control section 210 may regard μ as SCS of the scheduling cell and consider N as N^DL，^μ _cellsThe number of downlink cells considered to be among the configured downlink cells for which the scheduling cell includes the configured DL BWP having the first SCS (may be referred to as the number of downlink cells scheduled from the cell including the configured DL BWP having the first SCS instead, and may be referred to as the number of downlink cells scheduled from 1 or more carriers corresponding to the first SCS instead).

(hardware construction)

The block diagrams used in the description of the above embodiments represent blocks in functional units. These functional blocks (constituent units) are realized by any combination of at least one of hardware and software. Note that the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by using 1 device physically or logically combined, or by directly or indirectly (for example, by using a wired or wireless connection) connecting 2 or more devices physically or logically separated and using these plural devices. The functional blocks may be implemented by combining software in the above-described 1 device or a plurality of devices.

Here, the functions include, but are not limited to, judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, belief, broadcast (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (configuring), reconfiguration (reconfiguration), allocation (allocation), and the like. For example, a functional block (a constituent unit) that functions transmission may be referred to as a transmission unit (transmitter), a transmitter (transmitter), or the like. As described above, the implementation method is not particularly limited in each case.

For example, a base station, a user terminal, or the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 7 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 described above 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, and the like.

In addition, in the present disclosure, terms of devices, circuits, apparatuses, sections (sections), units, and the like can be interchanged with one another. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the illustrated devices, or may be configured to include no part of the devices.

For example, only one processor 1001 is shown, but there may be multiple processors. The processing may be executed by one processor, or the processing may be executed by 2 or more processors simultaneously, sequentially, or by another method. In addition, the processor 1001 may be implemented by more than one chip.

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

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110(210), the transmitting and receiving unit 120(220), and the like may be implemented by the processor 1001.

The processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with the read program. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 110(210) may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and may be similarly implemented with respect to other functional blocks.

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

The storage 1003 is a computer-readable recording medium and may be configured of at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, an optical magnetic disk (for example, a compact Disc (CD-rom), etc.), a digital versatile Disc, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (for example, a card, a stick, or a key drive), a magnetic stripe, a database, a server, or another suitable storage medium. The storage 1003 may be referred to as a secondary storage device.

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 referred to as a network device, a network controller, a network card, a communication module, or the like, for example. Communication apparatus 1004 may be configured to include, for example, a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, in order to realize at least one of Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD). For example, the transmitting/receiving unit 120(220), the transmitting/receiving antenna 130(230), and the like described above can be realized by the communication device 1004. The sending and receiving unit 120(220) may be physically or logically separated by the sending unit 120a (220a) and the receiving unit 120b (220 b).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 may be connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

The base station 10 and the user terminal 20 may be configured by 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), or the like, and a part or all of the functional blocks may be implemented by using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware.

(modification example)

In addition, terms described in the present disclosure and terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may be substituted for one another. Further, the signal may be a message. The reference signal (reference signal) may be simply referred to as RS, and may also be referred to as Pilot (Pilot), Pilot signal, or the like according to an applied standard. Further, Component Carriers (CCs) may also be referred to as cells, frequency carriers, Carrier frequencies, and the like.

A radio frame may be composed of one or more periods (frames) in the time domain. The one or more individual periods (frames) constituting a radio frame may be referred to as subframes. Further, a subframe may be composed of one or more slots in the time domain. The subframe may be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

Here, the parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may indicate, for example, at least one of 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 the transceiver in a frequency domain, a specific windowing process performed by the transceiver in a Time domain, and the like.

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

The time slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. PDSCH (or PUSCH) transmitted in a time unit larger than a mini slot may be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, the subframe, the slot, the mini-slot, and the symbol may use other names respectively corresponding thereto. In addition, time units such as frames, subframes, slots, mini-slots, symbols, etc. in the present disclosure may be interchanged with one another.

For example, one subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and one slot or one mini-slot may be referred to as a TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. In addition, a unit indicating TTI may be referred to as a slot, a mini slot, etc., instead of a subframe.

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

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is provided, a time interval (e.g., number of symbols) to which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

When one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Further, the number of slots (mini-slots) constituting the minimum time unit of the schedule can be controlled.

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

Additionally, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced by a TTI having a time length of more than 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced by a TTI having a TTI length that is less than the TTI length of the long TTI and greater than 1 ms.

A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include one or more continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may be decided based on the parameter set.

In addition, an RB may include one or more symbols in a time domain, and may also have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, and the like may be respectively composed of one or more resource blocks.

One or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, and the like.

Further, 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.

A Bandwidth Part (BWP) (which may be referred to as a partial Bandwidth, etc.) may represent a subset of consecutive common RBs (common resource blocks) for a certain set of parameters in a certain carrier. Here, the common RB may be determined by an index of an RB with reference to a common reference point of the carrier. PRBs may be defined by, and numbered within, a certain BWP.

In BWP, UL BWP (BWP for UL) and DL BWP (BWP for DL) may be included. One or more BWPs may be set within one carrier for a UE.

At least one of the provisioned BWPs may be active and the UE may not be supposed to transmit and receive a specific signal/channel outside the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may be replaced with "BWP".

The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the structure of the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously modified.

In addition, information, parameters, and the like described in the present disclosure may be expressed by absolute values, may be expressed by relative values with respect to specific values, and may be expressed by other corresponding information. For example, the radio resource may also be indicated by a specific index.

The names used in this disclosure for parameters and the like are not limiting names in all aspects. Further, the formulas and the like using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, the various names assigned to these various channels and information elements are not limitative names in all aspects.

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

Further, information, signals, and the like may be output from at least one of the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

The information, signals, and the like that are input/output may be stored in a specific place (for example, a memory) or may be managed using a management table. The information, signals, and the like to be input and output may be overwritten, updated, or additionally written. The outputted information, signal, etc. may be deleted. The inputted information, signal, etc. may be transmitted to other devices.

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

In addition, physical Layer signaling may be referred to as Layer 1/Layer 2(L1/L2)) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup (RRC Connection Setup) message, an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message, or the like. Further, the MAC signaling may be notified using a MAC Control Element (CE), for example.

Note that the notification of the specific information (for example, the notification of "X") is not limited to the explicit notification, and may be performed implicitly (for example, by not performing the notification of the specific information or by performing the notification of other information).

The determination may be performed based on a value (0 or 1) represented by 1 bit, a true or false value (boolean value) represented by true (true) or false (false), or a comparison of values (for example, a comparison with a specific value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, is to be broadly interpreted to mean commands, command sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Further, software, commands, information, and the like may be transmitted or received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of transmission medium.

The terms "system" and "network" as used in this disclosure may be used interchangeably. "network" may mean a device (e.g., a base station) included in a network.

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

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station (fixed Station)", "NodeB", "enb (enodeb)", "gnb (gtnodeb)", "access Point (access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" may be used interchangeably. A base station is sometimes also referred to by the terms macrocell, smallcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., 3) cells. In the case where a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also provide a communication service through a base station subsystem (e.g., an indoor small base station (Remote Radio Head (RRH))) — the term "cell" or "sector" refers to a part or the entire coverage area of at least one of the base station and the base station subsystem that performs a communication service in the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", "terminal" and the like may be used interchangeably.

A mobile station is also sometimes called a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand-held device (hand set), user agent, mobile client, or several other appropriate terms.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving body may be a vehicle (e.g., an automobile, an airplane, etc.), an unmanned moving body (e.g., an unmanned aerial vehicle, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station further includes a device that does not necessarily move during a 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.

In addition, the base station in the present disclosure may be replaced with a user terminal. For example, the embodiments and modes of the present disclosure may be applied to a configuration in which communication between a plurality of user terminals for communication between a base station and the user terminals is replaced by what may be referred to as Device-to-Device (D2D), Vehicle-to-Vehicle (V2X), or the like. In this case, the functions of the base station 10 described above may be provided by the user terminal 20. Further, languages such as "upstream" and "downstream" may be replaced with languages corresponding to inter-terminal communication (e.g., "side"). For example, the uplink channel, the downlink channel, etc. may be replaced with the sidestream channel.

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

In the present disclosure, it is assumed that the operation performed by the base station is sometimes performed by its upper node (upper node) depending on the case. It should be understood that in a network including one or more network nodes (network nodes) having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

The aspects and embodiments described in the present disclosure may be used alone, or in combination, or may be switched with execution. Note that the order of processing procedures, sequences, flowcharts, and the like of the respective modes/embodiments described in the present disclosure may be changed as long as they are not contradictory. For example, elements of the various steps are presented in the order illustrated with respect to the method described in the present disclosure, and are not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may be applied to Long Term Evolution (LTE), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER3G, IMT-Advanced, fourth generation Mobile communication System (4G)), fifth generation Mobile communication System (5G)), Future Radio Access (FRA)), New Radio Access Technology (New-Radio Access Technology (RAT)), New Radio (New Radio trademark (NR)), New Radio Access (NX)), next generation Radio Access (Future Radio Access), FX), Global Broadband communication System (Global System for Mobile communication (GSM), Mobile Broadband Mobile Communication (CDMA) (2000 Mobile registration)), and Mobile Broadband communication System (GSM-Mobile Communication (CDMA) registration), etc.) IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, Ultra-wideband (uwb), Bluetooth (registered trademark), a system using another appropriate wireless communication method, a next generation system expanded based on them, and the like. Furthermore, multiple systems may also be applied in combination (e.g., LTE or a combination of LTE-a and 5G, etc.).

The term "based on" used in the present disclosure does not mean "based only" unless otherwise specified. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to the use of the terms "first," "second," etc. in this disclosure does not comprehensively define the amount or sequence of such elements. These designations may be used in this disclosure as a convenient method of distinguishing between more than 2 elements. Thus, reference to first and second elements does not imply that only 2 elements may be used or that the first element must somehow override the second element.

The term "determining" used in the present disclosure sometimes includes various operations. For example, "determination (determination)" may be regarded as a case where "determination (determination)" is performed on determination (rounding), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) (for example, search in a table, a database, or another data structure), confirmation (authenticating), and the like.

The term "determination (decision)" may be regarded as a case of "determining (deciding)" on reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like.

The "determination (decision)" may be regarded as a case where the "determination (decision)" is performed for solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like. That is, "judgment (decision)" may also include a case where some operations are regarded as "judgment (decision)".

The "determination (decision)" may be replaced with "assumption", "expectation", "assumption", and the like.

The terms "connected" and "coupled" or all variations thereof used in the present disclosure mean that 2 or more elements are directly or indirectly connected or coupled to each other, and can include a case where 1 or more intermediate elements are present between 2 elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connect" may also be replaced with "access".

In the present disclosure, when 2 elements are connected, it can be considered that they are "connected" or "coupled" to each other using 1 or more wires, cables, printed electrical connections, and the like, and that they are "connected" or "coupled" to each other using electromagnetic energy having a wavelength in a radio frequency domain, a microwave domain, a light (both visible and invisible) domain, and the like, as a few non-limiting and non-inclusive examples.

In the present disclosure, the term "a and B are different" may mean "a and B are different from each other". In addition, the term may mean "a and B are different from C, respectively". The terms "separate", "combine", and the like are also to be construed as "different".

Where the terms "comprising", "including" and variations thereof are used in this disclosure, these terms are intended to be inclusive in the same way as the term "comprising". Further, the term "or" as used in this disclosure does not mean exclusive or.

In the present disclosure, for example, in the case where articles are added by translation as in a, an, and the in english, the present disclosure may include the case where names succeeding after the articles are plural.

Although the invention of the present disclosure has been described in detail, it will be apparent to those skilled in the art that the invention of the present disclosure is not limited to the embodiments described in the present disclosure. The disclosed invention can be implemented as modifications and variations without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not have any limiting meaning on the invention of the present disclosure.