JP2023029395A - Terminal, wireless communication method, and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor a PDCCH properly even in a case where a multi-TRP is utilized.

SOLUTION: A terminal according to an aspect of the present disclosure has: a reception unit that receives information indicating the relation between a search space set of a first CORESET and a search space set of a second CORESET; and a control unit that monitors downlink control channel candidates in the search space set of the first CORESET and the search space set of the second CORESET. The control unit decodes the same downlink control information on the basis of a first PDCCH candidate monitored in the search space set of the first CORESET and a second PDCCH candidate monitored in the search space set of the second CORESET. The first CORESET and the second CORESET have different QCL information.

SELECTED DRAWING: Figure 8

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present disclosure relates to terminals, wireless communication methods, and systems in next-generation mobile communication systems.

In the UMTS (Universal Mobile Telecommunications System) network, long term evolution (LTE: Long Term Evolution) has been specified for the purpose of further high data rate, low delay, etc. (Non-Patent Document 1). In addition, LTE-A (LTE Advanced, LTE Rel. 10, 11, 12, 13) was specified for the purpose of further increasing the capacity and sophistication of LTE (LTE Rel. 8, 9).

LTE successor systems (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Also referred to as Rel.14 or 15 or later) is also under consideration.

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

Blocking of radio waves is considered to be a serious problem in high frequency bands such as millimeter wave bands. In a future wireless communication system (hereinafter simply referred to as NR), it is expected that a method of transmitting signals using a plurality of transmission/reception points (TRP: Transmission/Reception Points) (multi-TRP) will solve this problem. there is

Also, in NR, the user terminal (UE: User Equipment) is based on the set control resource set (CORESET: Control Resource Set) and search space, downlink control channel (for example, PDCCH (Physical Downlink Control Channel)) are being considered for monitoring.

However, when the PDCCH-related control methods that have been studied so far are used, delays, UE loads, and the like become problems when supporting multi-TRP, and communication throughput may decrease.

Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a system that can appropriately monitor PDCCH even when multi-TRP is used.

A terminal according to an aspect of the present disclosure includes a receiving unit that receives information indicating a relationship between a search space set of a first CORESET (COntrol REsource SET) and a search space set of a second CORESET; and a control unit that monitors downlink control channel (PDCCH: Physical Downlink Control Channel) candidates in the search space set of the search space set and the second CORESET, wherein the control unit monitors the first CORESET Decoding the same downlink control information (DCI: Downlink Control Information) based on the first PDCCH candidate monitored in the search space set of and the second PDCCH candidate monitored in the search space set of the second CORESET, The first CORESET and the second CORESET have different QCL (Quasi-Co-Location) information.

According to one aspect of the present disclosure, it is possible to appropriately monitor PDCCH even when multi-TRP is used.

FIG. 1 is a diagram showing an example of communication using multi-TRP. FIG. 2 shows an example of a TRP selection sequence when the network knows the best TRP for the UE. FIG. 3 shows an example of a TRP selection sequence when the network does not know the best TRP for the UE. FIG. 4 is a diagram showing an example of CORESET set in the example of FIG. FIG. 5 is a diagram illustrating an example of resource mapping of PDCCH candidates in the second embodiment. 6A and 6B are diagrams showing an example of search space set configuration and PDCCH candidates identified based on the configuration in the second embodiment. 7A-7C are diagrams illustrating another example of resource mapping of PDCCH candidates in the second embodiment. FIG. 8 is a diagram illustrating an example of resource mapping of PDCCH candidates in the third embodiment. FIG. 9 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment. FIG. 10 is a diagram showing an example of the overall configuration of a radio base station according to one embodiment. FIG. 11 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment; FIG. 12 is a diagram illustrating an example of the overall configuration of a user terminal according to one embodiment. FIG. 13 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment; FIG. 14 is a diagram illustrating an example of hardware configurations of a radio base station and a user terminal according to an embodiment.

(CORESET)
In NR, a control resource set (CORESET: COntrol REsource SET) is used.

CORESET is an allocation candidate region for a control channel (for example, PDCCH (Physical Downlink Control Channel)). A CORESET may consist of predetermined frequency domain resources and time domain resources (eg, 1 or 2 OFDM symbols, etc.).

The UE may receive CORESET configuration information (CORESET configuration, which may also be referred to as coreset-Config) from the base station. A UE can detect a physical layer control signal by monitoring the CORESET set in its own terminal.

The CORESET configuration may, for example, be signaled by higher layer signaling and may be represented in a predefined RRC information element (which may be called "ControlResourceSet").

Here, the higher layer signaling may be, for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof.

MAC signaling may use MAC Control Element (MAC CE (Control Element)), MAC PDU (Protocol Data Unit), etc., for example. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), or the like.

A predetermined number (eg, 3 or less) of CORESETs may be configured for each bandwidth part (BWP: Bandwidth Part) configured for the UE in the serving cell.

Here, the BWP is a partial band set within a carrier (also called a cell, serving cell, component carrier (CC: Component Carrier), etc.), and is also called a partial band. The BWP may have an uplink (UL) BWP (UL BWP, uplink BWP) and a downlink (DL) BWP (DL BWP, downlink BWP). Each BWP given the predetermined number of CORESETs may be a DL BWP.

The CORESET configuration may mainly include information on PDCCH resource related configuration and RS related configuration. The UE may be provided with the following parameters via higher layer signaling (CORESET configuration) for CORESET#p (eg, 0≦p<3) configured in each DL BWP. That is, the following parameters may be signaled (configured) to the UE for each CORESET:
CORESET identifier (CORESET-ID (Identifier)),
- Scrambling ID of demodulation reference signal (DMRS: DeModulation Reference Signal) for PDCCH,
the duration of the CORESET in number of consecutive symbols (e.g. time duration, CORESET-time-duration);
- Frequency-domain resource allocation (for example, information indicating a predetermined number of resource blocks constituting CORESET (CORESET-freq-dom)),
- Mapping type (information indicating interleaved or non-interleaved) from control channel element (CCE) in CORESET to resource element group (REG) (for example, CORESET-CCE-to-REG-mapping -type),
information indicating the size of a group (REG bundle) containing a predetermined number of REGs (the number of REGs in the REG bundle) (for example, CORESET-REG-bundle-size);
Information indicating the cyclic shift (CS: Cyclic Shift, CS amount or CS index) for the interleaver of the REG bundle (for example, CORESET-shift-index),
Transmission Configuration Indication (TCI) state for PDCCH (also referred to as QCL information (antenna port QCL) of DMRS antenna port for PDCCH reception),
• An indication of the presence or absence of the TCI field in the DCI (eg DCI format 1_0 or DCI format 1_1) sent over the PDCCH in CORESET#p (eg TCI-PresentInDCI).

Note that "CORESET-ID#0" may indicate a CORESET (which may be called an initial CORESET, a default CORESET, etc.) set using the MIB.

(search space)
The search area and search method for PDCCH candidates are defined as Search Space (SS). A UE may receive search space configuration information (which may be referred to as a search space configuration) from a base station. The search space configuration may be notified by higher layer signaling (such as RRC signaling), for example.

The search space configuration may be signaled to the UE, for example, by higher layer signaling (such as RRC signaling), and may be represented by a predefined RRC information element (which may be called "SearchSpace").

The search space configuration mainly includes information on PDCCH monitoring-related configuration and decoding-related configuration, and may include, for example, information on at least one of the following:
Identifier of the search space (search space ID),
the identifier of the CORESET to which the search space setting is associated (CORESET-ID);
Information indicating whether a common search space (C-SS: Common SS) or UE-specific search space (UE-SS: UE-specific SS),
- The number of PDCCH candidates for each aggregation level (AL),
・Monitoring cycle,
・monitoring offset,
• A monitoring pattern within the slot (eg a 14-bit bitmap).

The UE monitors CORESET based on search space settings. The UE can determine the correspondence relationship between the CORESET and the search space based on the CORESET-ID included in the search space setting. A CORESET may be associated with one or more search spaces.

In the present disclosure, "monitor of CORESET", "monitor of search space (PDCCH candidate) associated with CORESET", "monitor of downlink control channel (for example, PDCCH)" and "monitor of downlink control information (DCI) ” may be read interchangeably. Also, "monitor" may be read as "at least one of blind decoding and blind detection".

(QCL/TCI)
In NR, the UE is based on information (QCL information) on pseudo co-location (QCL: Quasi-Co-Location) of the channel (e.g., PDCCH, PDSCH), reception processing of the channel (e.g., demapping, demodulation, decoding (at least one of the

Here, QCL is an index indicating the statistical properties of a channel. For example, when one signal and another signal have a QCL relationship, between these different signals, Doppler shift, Doppler spread, average delay, delay spread spread), and at least one of the Spatial parameters (eg Spatial Rx Parameter) can be assumed to be the same (QCL for at least one of these).

Note that the spatial reception parameters may correspond to the UE's receive beam (eg, receive analog beam), and the beam may be specified based on the spatial QCL. QCL and at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).

A plurality of types (QCL types) may be defined for the QCL. For example, four QCL types AD may be provided with different parameters (or parameter sets) that can be assumed to be the same, the parameters being shown below:
QCL type A: Doppler shift, Doppler spread, mean delay and delay spread;
QCL type B: Doppler shift and Doppler spread,
QCL type C: mean delay and Doppler shift;
• QCL type D: Spatial reception parameters.

A transmission configuration indication (TCI) state (TCI-state) may indicate (or include) QCL information.

TCI state (and / or QCL information), for example, the channel of interest (or reference signal for the channel (RS: Reference Signal)) and another signal (for example, another downlink reference signal (DL-RS: Downlink Reference Signal)) may be information about QCL, for example, at least one of information about DL-RS (DL-RS related information) and information indicating the QCL type (QCL type information) may include

The DL-RS-related information may include at least one of information indicating a DL-RS that has a QCL relationship and information indicating resources of the DL-RS. For example, when multiple reference signal sets (RS sets) are configured in the UE, the DL-RS-related information includes the channel (or port for the channel) and QCL relationship among the RSs included in the RS set. At least one of a DL-RS that has a DL-RS, a resource for the DL-RS, and the like may be indicated.

Here, at least one of the RS and DL-RS for the channel is a synchronization signal (SS: Synchronization Signal), a broadcast channel (PBCH: Physical Broadcast Channel), a synchronization signal block (SSB: Synchronization Signal Block), a mobility reference signal ( MRS: Mobility RS), channel state information reference signal (CSI-RS: Channel Sate Information-Reference Signal), demodulation reference signal (DMRS: DeModulation Reference Signal), beam-specific signal, etc., or at least one of them, or an extension of these , or a signal configured by changing (for example, a signal configured by changing at least one of density and period).

The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). An SSB may be a signal block containing synchronization signals and broadcast channels, and may also be called an SS/PBCH block, or the like.

Information about the PDCCH (or DMRS antenna ports associated with the PDCCH) and QCL with a given DL-RS may be referred to as the TCI state for the PDCCH, and so on. Information about the PDSCH (or the DMRS antenna ports associated with the PDSCH) and the QCL with a given DL-RS may be referred to as the TCI state for the PDSCH, and so on.

The UE may assume the same sQCL as PBCH for Type 0 and Type 1 - PDCCH common search spaces. The UE may also determine the sQCL for Type 3-PDCCH common search spaces and UE-specific search spaces based on higher layer signaling.

The UE may determine the TCI state for PDCCH (CORESET) based on RRC signaling and MAC CE.

For example, one or more (K) TCI states may be configured by higher layer signaling for each CORESET for the UE. The UE may also activate one or more TCI states for each CORESET respectively using MAC CE.

The UE may be notified (configured) of M (M≧1) TCI states for PDSCH (QCL information for M PDSCHs) by higher layer signaling. Note that the number M of TCI states configured in the UE may be limited by at least one of UE capability and QCL type.

The DCI used for PDSCH scheduling may include a predetermined field (for example, it may be called a TCI field, a TCI field, a TCI state field, etc.) indicating a TCI state (QCL information for PDSCH). The DCI may be used for PDSCH scheduling of one cell, and may be called, for example, DL DCI, DL assignment, DCI format 1_0, DCI format 1_1, and the like.

Also, if the DCI includes a TCI field of x bits (e.g., x=3), the base station can detect up to 2 ^x (e.g., x=3, 8) types of TCI states using higher layer signaling. It may be pre-configured in the UE. The value of the TCI field in DCI (TCI field value) may indicate one of the TCI states preset by higher layer signaling.

If more than 8 TCI states are configured in the UE, MAC CE may be used to activate (specify) up to 8 TCI states. The value of the TCI field in DCI may indicate one of the TCI states activated by the MAC CE.

The UE may determine the QCL of PDSCH (or DMRS port of PDSCH) based on the TCI state indicated by the TCI field value in DCI. For example, the UE assumes that the PDSCH DMRS port (or DMRS port group) of the serving cell is the DL-RS and QCL corresponding to the TCI state indicated by the DCI, PDSCH reception processing (eg, decoding , demodulation, etc.). This makes it possible to improve the reception accuracy of the PDSCH.

(FR1/FR2)
In NR, the UE communicates using at least one frequency band (carrier frequency) of the first frequency band (FR1: Frequency Range 1) and the second frequency band (FR2: Frequency Range 2) measurement, etc.) is being considered.

For example, FR1 may be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz).

FR1 may be defined as a frequency range in which at least one of 15, 30 and 60 kHz is used as Sub-Carrier Spacing (SCS).

FR2 may be defined as the frequency range in which at least one of 60 and 120 kHz is used as SCS. Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a higher frequency band than FR2.

FR2 may be used only for Time Division Duplex (TDD) bands. FR2 corresponds to millimeter waves (mmW) with a wavelength of about 1 mm to 10 mm, so it may be called the mmW band. The mmW band may be called EHF (Extremely High Frequency).

Note that FR1 and FR2 in the present disclosure are replaced with first frequency range and second frequency range, which are more general expressions that are not limited to specific frequency bands, respectively. may be

(Multi-TRP)
Radio wave blocking is considered to be a serious problem in high-frequency bands such as the mmW band, and transmitting signals using multiple transmission/reception points (TRP) (multi-TRP) is considered to be a serious problem. It is expected as a solution to the problem.

FIG. 1 is a diagram showing an example of communication using multi-TRP. In this example, two TRPs (TRP #1 and #2) can transmit signals to the UE (eg, the two TRPs are serving the UE's serving cell). Even if the reception quality of the signal from one of the TRPs deteriorates in the UE, if the reception quality of the signal from the other TRP is above a certain level, communication can be maintained.

However, when considering the specific case of operating multi-TRP, there are further considerations. These considerations will be described below with reference to Figures 2-4.

FIG. 2 shows an example of a TRP selection sequence when the network knows the best TRP for the UE. At the first instant shown, the best TRP for the UE is assumed to be TRP#1.

In step S11, the network (eg, TRP#1) configures one CORESET for the UE with a TCI state indicating that it is the RS and QCL from TRP#1.

In step S12, the network (for example, TRP#1) transmits MAC CE for activating the TCI state of CORESET set in step S11 to the UE.

In step S13, the UE reports L1-RSRP based on the activated TCI state. L1-RSRP may be reported periodically, for example.

In step S14, the network needs to change the TRP for the UE based on the L1-RSRP (for example, L1-RSRP is below a predetermined threshold, L1-RSRP cannot be received for a certain period of time). ).

In step S15, the network (for example, TRP#2) transmits to the UE a MAC CE for activating the TCI state indicating that it is the RS and QCL from TRP#2 for the one CORESET. do.

In the example of FIG. 2, the function of setting TCI state for CORESET, previously considered in Rel-15 NR, can be used to control multi-TRP. However, control of the TCI state of PDCCH based on RRC configuration and MAC CE activation is very slow, and it is also necessary to schedule PDSCH for transmitting MAC CE.

FIG. 3 shows an example of a TRP selection sequence when the network does not know the best TRP for the UE.

In step S21, the network (eg, at least one of TRP #1 and #2) configures two CORESETs for the UE. where one CORESET is the CORESET (CORESET#1) with the TCI state indicating that it is the RS and QCL from TRP#1, and the other CORESET is the RS and QCL from TRP#2. A CORESET (CORESET#2) with a TCI state indicating that

In step S22, the network sends to the UE one or more MAC CEs for activating the TCI states of the two CORESETs set in step S21.

In step S23, the UE reports L1-RSRP based on the activated TCI state. L1-RSRP may be reported periodically, for example.

FIG. 4 is a diagram showing an example of CORESET set in the example of FIG. As shown in FIG. 4, for example, CORESET#1 may be located at the 0th symbol (first symbol) of the slot and CORESET#2 may be located at the 1st symbol of the slot. The UE monitors the PDCCH over the two CORESETs based on different TCI state settings.

At step S24, the network recognizes that the UE needs to change the TRP based on the L1-RSRP.

In the example of Figures 3-4, if the UE is configured with multiple CORESETs corresponding to multiple TCI state settings, the network does not need to know the best TRP in advance. However, since the number of CORESETs per DL BWP is limited to a predetermined number (eg, 3), the maximum number of multi-TRPs will also be limited. In addition, the number of PDCCH candidates monitored by the UE also increases by the number of set CORESETs, increasing the processing load on the UE.

As described above, if the PDCCH-related control methods that have been studied so far are used, delays, UE loads, and the like become problems when supporting multi-TRP, and communication throughput may decrease.

Therefore, the present inventors came up with a method of appropriately monitoring the PDCCH even when using multi-TRP.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication method according to each embodiment may be applied independently, or may be applied in combination.

(Wireless communication method)
<First embodiment>
In the first embodiment, the TCI state for PDCCH may be configured with finer granularity than per CORESET.

For example, the TCI state for PDCCH may be configurable per search space configuration (per search space configuration). Note that "search space setting", "search space set", "search space set setting", etc. in the present disclosure may be read interchangeably.

In existing NR studies, the TCI state for PDCCH (CORESET) was configured per CORESET. For example, the UE determines the TCI state that can be activated in the CORESET unit based on the TCI state parameter (tci-StatesPDCCH) included in the CORESET setting information (RRC ControlResourceSet information element) set by RRC. .

The TCI state for PDCCH may be configurable per aggregation level (AL) for a given search space configuration. For example, different TCI states for PDCCH may be configured with AL=1, 2, 4, 8, etc. for a certain search space configuration.

The TCI state for PDCCH may be configurable for each PDCCH candidate for a given search space configuration. For example, a different TCI state for PDCCH may be configured for each PDCCH candidate index for a certain search space configuration.

In a first embodiment, the search space configuration (RRC SearchSpace information element) may include the TCI state parameters. The UE includes a TCI state parameter in the search space configuration, and the TCI state for the CORESET associated with the search space ID for that search space configuration is determined based on the search space configuration, not the CORESET configuration information for that CORESET. (ie the tci-StatesPDCCH in ControlResourceSet may be ignored).

At least one of a per AL TCI state parameter and a per PDCCH candidate TCI state parameter may be included in the search space configuration (RRC SearchSpace information element). Based on this parameter, the UE may determine the TCI state for the PDCCH based on at least one of the AL unit and the PDCCH candidate unit.

According to the first embodiment described above, the TCI state for PDCCH can be set more flexibly.

<Second embodiment>
In a second embodiment, one PDCCH candidate may be able to be mapped across multiple CORESETs. In a second embodiment, the UE may be configured with one search space (search space set) associated with more than one CORESET. Each PDCCH candidate or each AL may be mapped to any one or more of the above configured CORESETs.

For example, the network may transmit PDCCH candidates according to the following method:
(1) a portion of a PDCCH candidate corresponding to CORESET#1 (TCI state is associated with TRP#1) is transmitted by TRP#1;
(2) Part of the above PDCCH candidates corresponding to CORESET#2 (TCI state is associated with TRP#2) is transmitted by TRP#2.

Upon receiving the entire PDCCH candidate, the UE may decode the PDCCH candidate. Here, the UE may use the PDCCH candidate part of (1) and the PDCCH candidate part of (2) above for soft combining. In addition, in the present disclosure, “soft synthesis” may be read as “synthesis”, “decoding”, “error correction”, or the like.

FIG. 5 is a diagram illustrating an example of resource mapping of PDCCH candidates in the second embodiment. This example is almost similar to FIG. 4, except that one PDCCH candidate (dashed line in the figure) is mapped (associated) across CORESET #1 and #2.

If one PDCCH candidate or AL is mapped to multiples of more than one CORESET, that PDCCH candidate or AL may be separated into subsets associated with different CORESETs.

6A and 6B are diagrams showing an example of search space set configuration and PDCCH candidates identified based on the configuration in the second embodiment. The UE may receive search space set configuration information including multiple CORESET-IDs (ID #1 and #2 in this example), as shown in FIG. 6A.

The UE may assume that the PDCCH candidates in the search space corresponding to the search space set configuration are transmitted over CORESET IDs #1 and #2 as shown in FIG. 6B, and perform reception processing.

In addition, in the example of FIG. 6B, the frequency resources of the PDCCH over the multiple CORESETs are the same over the multiple CORESETs, but the present invention is not limited to this. Different radio resources (eg frequency and time resources) may be applied for each part of the PDCCH based on the corresponding CORESET settings.

7A-7C are diagrams illustrating another example of resource mapping of PDCCH candidates in the second embodiment.

FIG. 7A shows an example in which frequency resources of each CORESET included in one PDCCH candidate are in units of REG bundles. Based on the configuration of the CORESET specified by the CORESET ID, the UE determines the amount of resources corresponding to the PDCCH candidates in the CORESET (for example, resources in units of at least one of CCEs, CCE groups, REGs, REG bundles, PRBs, etc.). amount) may be determined. When the UE monitors one PDCCH candidate across multiple CORESETs, it may determine the resource amount for each CORESET portion based on each CORESET configuration.

FIG. 7B shows an example where both the time and frequency resources of each CORESET included in one PDCCH candidate are different. In this example, CORESET#1 is one symbol long and CORESET#2 is two symbols long. Also, the frequency resource of the CORESET#1 part of the PDCCH candidate is larger than that of the CORESET#2 part.

FIG. 7C shows an example of different mapping types (interleaved or non-interleaved) of CORESETs included in one PDCCH candidate. In this example, CORESET#1 is an interleaved mapping and CORESET#2 is a non-interleaved mapping.

According to the second embodiment described above, by configuring PDCCH candidates over a plurality of CORESETs, resource mapping of PDCCH candidates can be made flexible, and TRP diversity can be suitably realized.

<Third Embodiment>
In a third embodiment, it may be possible for one DCI to be sent repeatedly over multiple CORESETs. Here, repeated transmissions of PDCCH (DCI) may be performed over multiple search space sets each associated with a different CORESET with different TCI state settings.

FIG. 8 is a diagram illustrating an example of resource mapping of PDCCH candidates in the third embodiment. In this example, one PDCCH candidate (dashed line in the figure) is mapped to each of CORESET #1 and #2. Here, the DCI transmitted in each PDCCH candidate is the same DCI. That is, one DCI is repeatedly transmitted using these multiple PDCCH candidates.

The UE may or may not soft-combine the repeatedly transmitted DCI. Also, the UE may or may not soft-combine data (PDSCH) scheduled by DCI that is repeatedly transmitted. Hereinafter, the case where the UE does not soft combine the DCI (and the data corresponding to the DCI) repeatedly transmitted in separate search space sets (Embodiment 3.1) and the case where soft combining is performed (Embodiment 3.2) , respectively.

[Embodiment 3.1]
If the UE does not soft-combine DCI (and data corresponding to that DCI) that are repeatedly transmitted in different search space sets, the UE may assume that different DCIs schedule different data.

The UE may detect more than one DL DCI per slot and may decode more than one PDSCH per slot.

In addition, the UE is a decoded DCI or data (DL shared channel (DL-SCH)) higher layers (eg, MAC layer, PDCP (Packet Data Convergence Protocol) layer, RLC (Radio Link Control) layer, RRC layer, IP (Internet Protocol) layer, etc.).

UE, if a duplicate (or the same content) packet (data, control information, etc.) is found in the upper layer, discard at least one of the duplicate packets (discard). The packet is at least one of IP packet, RLC Service Data Unit (SDU), RLC Protocol Data Unit (PDU), PDCP SDU, PDCP PDU, MAC SDU, MAC PDU, etc. good too. Note that "discard" may be read as "ignore", "drop", or the like.

[Embodiment 3.2]
The UE may be configured with higher layer signaling information indicating that PDCCH candidates in one search space set are related to PDCCH candidates in another search space set. The information may be, for example, information indicating soft combining of PDCCH candidates in one search space set and PDCCH candidates in another search space set.

The UE may determine the number of blind decodings of the PDCCH candidates based on soft combining. For example, the UE may count the number of times of blind decoding of PDCCH candidates based on the number of PDCCH candidates after soft-combining (the number of DCIs whose content can be different among all PDCCHs (DCIs)). Even if there are two PDCCH candidates before soft combining, the UE assumes that the number of blind decodings for these PDCCH candidates is 1 when applying soft combining to these PDCCH candidates. good.

In addition, the UE may count the number of times of blind decoding of PDCCH candidates based on the number of PDCCH candidates before soft combining (the number of all PDCCH (DCI) (DCIs with the same content are counted in duplicate)). . If there are two PDCCH candidates before soft combining, the UE assumes that the number of blind decodings for these PDCCH candidates is 2 even if soft combining is applied to these PDCCH candidates. good.

Note that these methods of counting the number of times of blind decoding may be applied to other embodiments.

According to the third embodiment described above, there is a possibility that the PDSCH of each TRP can be decoded if at least one DCI that is repeatedly transmitted is successfully decoded, and TRP diversity can be suitably realized.

<Modification>
Although each of the above-described embodiments has been described assuming multi-TRP, it may also be applied when UE communicates using one TRP (single TRP).

For example, the UE may monitor (decode) one PDCCH candidate across multiple CORESETs indicated to be DL RS and QCL with the same TCI state TRP#1.

In addition, when at least one of the above-described embodiments is used, the UE uses signals transmitted from different sTRPs on a plurality of radio resources for which communication using multi-TRP is set, and uses one PDCCH It may be assumed that the candidate is set to be decoded, and so on.

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

FIG. 9 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment. In the radio communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) that integrates a plurality of basic frequency blocks (component carriers) with the system bandwidth of the LTE system (e.g., 20 MHz) as one unit is applied. can do.

The wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that implements these.

A radio communication system 1 includes a radio base station 11 forming a macro cell C1 with a relatively wide coverage, and a radio base station 12 (12a-12c) arranged in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. , is equipped with User terminals 20 are arranged in the macro cell C1 and each small cell C2. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.

A user terminal 20 can be connected to both the radio base station 11 and the radio base station 12 . The user terminal 20 is assumed to use the macrocell C1 and the small cell C2 simultaneously using CA or DC. Also, the user terminal 20 may apply CA or DC using a plurality of cells (CCs).

Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier with a relatively low frequency band (eg, 2 GHz) and a narrow bandwidth (also called an existing carrier, legacy carrier, etc.). On the other hand, between the user terminal 20 and the radio base station 12, a carrier with a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used. The same carrier may be used as during Note that the configuration of the frequency band used by each radio base station is not limited to this.

Also, the user terminal 20 can perform communication using time division duplex (TDD) and/or frequency division duplex (FDD) in each cell. Also, in each cell (carrier), a single neumerology may be applied, or a plurality of different neumerologies may be applied.

A numerology may be a communication parameter that applies to the transmission and/or reception of a certain signal and/or channel, e.g. subcarrier spacing, bandwidth, symbol length, cyclic prefix length, subframe length , TTI length, number of symbols per TTI, radio frame structure, certain filtering operations performed by the transceiver in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like. For example, if a physical channel has different subcarrier spacing and/or different numbers of OFDM symbols, it may be said to have different numerologies.

The wireless base station 11 and wireless base station 12 (or two wireless base stations 12) are connected by wire (for example, an optical fiber conforming to CPRI (Common Public Radio Interface), X2 interface, etc.) or wirelessly. may be

The radio base station 11 and each radio base station 12 are each connected to a higher station apparatus 30 and connected to a core network 40 via the higher station apparatus 30 . Note that the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), etc., but is not limited thereto. Also, each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11 .

Note that the radio base station 11 is a radio base station having relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission/reception point, or the like. Also, the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), a transmission/reception Also called a point. Hereinafter, the radio base stations 11 and 12 are collectively referred to as the radio base station 10 when not distinguished.

Each user terminal 20 is a terminal compatible with various communication systems such as LTE and LTE-A, and may include not only mobile communication terminals (mobile stations) but also fixed communication terminals (fixed stations).

In the radio communication system 1, as a radio access scheme, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier frequency division multiple access (SC-FDMA) is applied to the uplink. Frequency Division Multiple Access) and/or OFDMA are applied.

OFDMA is a multi-carrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier for communication. SC-FDMA divides the system bandwidth into bands composed of one or continuous resource blocks for each terminal, and multiple terminals use different bands to reduce interference between terminals Single carrier transmission method. Note that the uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.

In the radio communication system 1, downlink channels include a downlink shared channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1/L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by the PDSCH. Moreover, MIB (Master Information Block) is transmitted by PBCH.

The downlink L1/L2 control channel includes PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like. Downlink control information (DCI: Downlink Control Information) including PDSCH and/or PUSCH scheduling information and the like are transmitted by the PDCCH.

Note that a DCI that schedules DL data reception may be called a DL assignment, and a DCI that schedules UL data transmission may be called a UL grant.

PCFICH carries the number of OFDM symbols used for PDCCH. The PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK/NACK, etc.) for PUSCH. EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like like PDCCH.

In the radio communication system 1, as uplink channels, an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used. User data, higher layer control information, etc. are transmitted by PUSCH. Also, the PUCCH transmits downlink radio quality information (CQI: Channel Quality Indicator), acknowledgment information, scheduling request (SR: Scheduling Request), and the like. A random access preamble for connection establishment with a cell is transmitted by PRACH.

In the radio communication system 1, as downlink reference signals, cell-specific reference signals (CRS), channel state information-reference signals (CSI-RS), demodulation reference signals (DMRS: DeModulation Reference Signal), Positioning Reference Signal (PRS), etc. are transmitted. In addition, in the radio communication system 1, measurement reference signals (SRS: Sounding Reference Signals), demodulation reference signals (DMRS), etc. are transmitted as uplink reference signals. Note that DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal). Also, the reference signals to be transmitted are not limited to these.

(radio base station)
FIG. 10 is a diagram showing an example of the overall configuration of a radio base station according to one embodiment. The radio base station 10 includes a plurality of transmitting/receiving antennas 101 , an amplifier section 102 , a transmitting/receiving section 103 , a baseband signal processing section 104 , a call processing section 105 and a transmission line interface 106 . Note that the transmitting/receiving antenna 101, the amplifier section 102, and the transmitting/receiving section 103 may be configured to include one or more.

User data transmitted from the radio base station 10 to the user terminal 20 on the downlink is input from the higher station apparatus 30 to the baseband signal processing section 104 via the transmission line interface 106 .

In the baseband signal processing unit 104, regarding user data, PDCP (Packet Data Convergence Protocol) layer processing, user data division / combination, RLC (Radio Link Control) RLC layer transmission processing such as retransmission control, MAC (Medium Access Control) transmission processing such as retransmission control (e.g., HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, etc. 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and transferred to the transmission/reception section 103 .

Transmitting/receiving section 103 converts the baseband signal output from baseband signal processing section 104 after precoding for each antenna into a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmitting/receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting/receiving antenna 101 . The transmitting/receiving unit 103 can be configured from a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common recognition in the technical field according to the present disclosure. The transmitting/receiving section 103 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.

On the other hand, as for the uplink signal, the radio frequency signal received by the transmitting/receiving antenna 101 is amplified by the amplifier section 102 . The transmitting/receiving section 103 receives the upstream signal amplified by the amplifier section 102 . Transmitting/receiving section 103 frequency-converts the received signal into a baseband signal and outputs the baseband signal to baseband signal processing section 104 .

The baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on the user data contained in the input uplink signal. Decoding, reception processing for MAC retransmission control, and reception processing for the RLC layer and PDCP layer are performed, and transferred to the upper station apparatus 30 via the transmission line interface 106 . The call processing unit 105 performs call processing (setup, release, etc.) of communication channels, state management of the radio base station 10, management of radio resources, and the like.

The transmission line interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface. In addition, the transmission line interface 106 transmits and receives signals (backhaul signaling) to and from other radio base stations 10 via an interface between base stations (for example, an optical fiber conforming to CPRI (Common Public Radio Interface), an X2 interface). may

Note that the transmitting/receiving unit 103 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit consists of an analog beamforming circuit (e.g., phase shifter, phase shift circuit) or an analog beamforming device (e.g., phase shifter) described based on common recognition in the technical field of the present invention. You may Also, the transmitting/receiving antenna 101 may be configured by an array antenna, for example.

FIG. 11 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present disclosure; Note that this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the wireless base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing section 104 includes at least a control section (scheduler) 301 , a transmission signal generation section 302 , a mapping section 303 , a reception signal processing section 304 and a measurement section 305 . Note that these configurations need only be included in the radio base station 10, and some or all of the configurations need not be included in the baseband signal processing section 104. FIG.

A control unit (scheduler) 301 controls the entire radio base station 10 . The control unit 301 can be configured from a controller, a control circuit, or a control device that will be described based on common recognition in the technical field related to the present disclosure.

The control section 301 controls, for example, signal generation in the transmission signal generation section 302 and signal allocation in the mapping section 303 . Further, the control section 301 controls signal reception processing in the reception signal processing section 304, signal measurement in the measurement section 305, and the like.

Control section 301, system information, downlink data signals (eg, signals transmitted by PDSCH), downlink control signals (eg, signals transmitted by PDCCH and / or EPDCCH, acknowledgment information, etc.) scheduling (eg, resources allocation). Also, the control section 301 controls the generation of the downlink control signal, the downlink data signal, etc., based on the result of determining whether or not retransmission control is required for the uplink data signal.

The control section 301 controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal)/SSS (Secondary Synchronization Signal)), downlink reference signals (for example, CRS, CSI-RS, DMRS), and the like.

The control unit 301 includes uplink data signals (eg, signals transmitted by PUSCH), uplink control signals (eg, signals transmitted by PUCCH and/or PUSCH, acknowledgment information, etc.), random access preambles (eg, PRACH signals to be transmitted), uplink reference signals, and so on.

The control unit 301 uses digital BF (e.g., precoding) in the baseband signal processing unit 104 and/or analog BF (e.g., phase rotation) in the transmission/reception unit 103 to form a transmission beam and/or a reception beam. may be performed. The control unit 301 may control beam formation based on downlink channel information, uplink channel information, and the like. These channel information may be acquired from the received signal processing section 304 and/or the measuring section 305 .

Transmission signal generation section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from control section 301 and outputs it to mapping section 303 . The transmission signal generation unit 302 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generating section 302 generates, for example, based on an instruction from the control section 301, a DL assignment that notifies downlink data allocation information and/or a UL grant that notifies uplink data allocation information. Both DL assignments and UL grants are DCI and follow the DCI format. Also, the downlink data signal is subjected to coding processing and modulation processing according to the coding rate, modulation scheme, etc. determined based on channel state information (CSI) from each user terminal 20 and the like.

Based on an instruction from control section 301 , mapping section 303 maps the downlink signal generated by transmission signal generation section 302 to a predetermined radio resource, and outputs the result to transmission/reception section 103 . The mapping unit 303 can be configured from a mapper, a mapping circuit, or a mapping device described based on common understanding in the technical field related to the present disclosure.

Received signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the received signal input from transmitting/receiving section 103 . Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20 . The received signal processing unit 304 can be configured from a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure.

Received signal processing section 304 outputs the information decoded by the reception processing to control section 301 . For example, when receiving PUCCH including HARQ-ACK, it outputs HARQ-ACK to control section 301 . In addition, received signal processing section 304 outputs the received signal and/or the signal after receiving processing to measuring section 305 .

A measurement unit 305 performs measurements on the received signal. The measurement unit 305 can be configured from a measuring instrument, a measuring circuit, or a measuring device described based on common understanding in the technical field related to the present disclosure.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, etc. based on the received signal. Measurement section 305 measures received power (eg, RSRP (Reference Signal Received Power)), received quality (eg, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured. A measurement result may be output to the control unit 301 .

Note that the transmitting/receiving section 103 may transmit downlink control information (DCI) (DL assignment, etc.) for scheduling a downlink shared channel (for example, PDSCH) using the PDCCH. The transmitting/receiving unit 103 may transmit setting information regarding search space setting (for example, SearchSpace information element), setting information regarding CORESET (for example, ControlResourceSet information element), and the like to the user terminal 20 .

(user terminal)
FIG. 12 is a diagram illustrating an example of the overall configuration of a user terminal according to one embodiment. The user terminal 20 includes a plurality of transmitting/receiving antennas 201 , an amplifier section 202 , a transmitting/receiving section 203 , a baseband signal processing section 204 and an application section 205 . Note that the transmission/reception antenna 201, the amplifier section 202, and the transmission/reception section 203 may be configured to include one or more.

A radio frequency signal received by the transmitting/receiving antenna 201 is amplified by the amplifier section 202 . The transmitting/receiving section 203 receives the downstream signal amplified by the amplifier section 202 . Transmitting/receiving section 203 frequency-converts the received signal into a baseband signal and outputs the baseband signal to baseband signal processing section 204 . The transmitting/receiving unit 203 can be configured from a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common recognition in the technical field according to the present disclosure. The transmitting/receiving section 203 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.

The baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing for retransmission control, and the like on the input baseband signal. Downlink user data is transferred to the application unit 205 . The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. In addition, among downlink data, broadcast information may also be transferred to the application unit 205 .

On the other hand, uplink user data is input from the application section 205 to the baseband signal processing section 204 . In the baseband signal processing unit 204, transmission processing for retransmission control (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, etc. are performed. 203.

The transmitting/receiving unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits the radio frequency band signal. The radio frequency signal frequency-converted by the transmitting/receiving section 203 is amplified by the amplifier section 202 and transmitted from the transmitting/receiving antenna 201 .

Note that the transmitting/receiving unit 203 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit consists of an analog beamforming circuit (e.g., phase shifter, phase shift circuit) or an analog beamforming device (e.g., phase shifter) described based on common recognition in the technical field of the present invention. You may Also, the transmitting/receiving antenna 201 may be configured by, for example, an array antenna.

FIG. 13 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment; Note that this example mainly shows the functional blocks of the characteristic portions of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing section 204 of the user terminal 20 includes at least a control section 401 , a transmission signal generation section 402 , a mapping section 403 , a reception signal processing section 404 and a measurement section 405 . Note that these configurations need only be included in the user terminal 20 , and some or all of the configurations may not be included in the baseband signal processing section 204 .

The control unit 401 controls the user terminal 20 as a whole. The control unit 401 can be configured from a controller, a control circuit, or a control device that will be described based on common understanding in the technical field related to the present disclosure.

The control section 401 controls, for example, signal generation in the transmission signal generation section 402 and signal allocation in the mapping section 403 . Further, the control section 401 controls signal reception processing in the reception signal processing section 404, signal measurement in the measurement section 405, and the like.

The control section 401 acquires the downlink control signal and the downlink data signal transmitted from the radio base station 10 from the received signal processing section 404 . The control section 401 controls the generation of the uplink control signal and/or the uplink data signal based on the result of determining whether retransmission control is necessary for the downlink control signal and/or the downlink data signal.

The control unit 401 uses digital BF (e.g., precoding) in the baseband signal processing unit 204 and/or analog BF (e.g., phase rotation) in the transmission/reception unit 203 to form a transmission beam and/or a reception beam. may be performed. The control unit 401 may control beam formation based on downlink channel information, uplink channel information, and the like. These channel information may be obtained from the received signal processing section 404 and/or the measuring section 405 .

Further, when various information notified from the radio base station 10 is acquired from the reception signal processing unit 404, the control unit 401 may update the parameters used for control based on the information.

Transmission signal generation section 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from control section 401 and outputs it to mapping section 403 . The transmission signal generation unit 402 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generating section 402 generates an uplink control signal related to acknowledgment information, channel state information (CSI), etc. based on an instruction from the control section 401, for example. Also, transmission signal generation section 402 generates an uplink data signal based on an instruction from control section 401 . For example, the transmission signal generator 402 is instructed by the controller 401 to generate an uplink data signal when the downlink control signal notified from the radio base station 10 includes the UL grant.

Mapping section 403 maps the uplink signal generated by transmission signal generation section 402 to radio resources based on an instruction from control section 401 , and outputs the result to transmission/reception section 203 . The mapping unit 403 can be configured from a mapper, a mapping circuit, or a mapping device described based on common understanding in the technical field related to the present disclosure.

Received signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the received signal input from transmitting/receiving section 203 . Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10 . The received signal processing unit 404 can be configured from a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure. Also, the received signal processing unit 404 can configure a receiving unit according to the present disclosure.

Received signal processing section 404 outputs the information decoded by the reception processing to control section 401 . Received signal processing section 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, etc. to control section 401 . In addition, received signal processing section 404 outputs the received signal and/or the signal after receiving processing to measuring section 405 .

A measurement unit 405 performs measurements on the received signal. For example, the measuring section 405 may perform same-frequency measurement and/or different-frequency measurement for one or both of the first carrier and the second carrier. When the serving cell is included in the first carrier, the measurement section 405 may perform inter-frequency measurement on the second carrier based on the measurement instruction acquired from the received signal processing section 404 . The measuring unit 405 can be configured from a measuring instrument, a measuring circuit, or a measuring device described based on common understanding in the technical field related to the present disclosure.

For example, measurement section 405 may perform RRM measurement, CSI measurement, etc. based on the received signal. Measurement section 405 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like. A measurement result may be output to the control unit 401 .

Note that the transmitting/receiving section 203 may receive downlink control information (DCI) (DL assignment, etc.) for scheduling a downlink shared channel (for example, PDSCH). The transmitting/receiving unit 203 may receive setting information (for example, SearchSpace information element) regarding search space setting, setting information (for example, ControlResourceSet information element) regarding CORESET, and the like from the radio base station 10 .

Based on the setting information (at least one of setting information about search space setting and setting information about CORESET), control section 401 selects PDCCH (Physical Downlink Control Channel) candidates included in a certain control resource set (CORESET: COntrol REsource SET). Alternatively, the state (TCI-state) of a transmission configuration indicator (TCI) for each aggregation level may be determined (also referred to as identification, determination, or the like).

Control unit 401 may assume that one PDCCH candidate is mapped (which may be expressed as mapped, assigned, transmitted, etc.) across multiple CORESETs based on the configuration information.

Based on the setting information, the control section 401 may assume that the same downlink control information (DCI) is transmitted in each of a plurality of CORESETs.

Control section 401 may determine to soft-combine PDCCH candidates of a plurality of search spaces based on the configuration information. For example, based on the setting information, the control unit 401 selects the PDCCH candidate of the first search space set corresponding to a part of the plurality of CORESETs (for example, the first CORESET) from another of the plurality of CORESETs. A portion (eg, the second CORESET) may be soft-combined with corresponding PDCCH candidates of the second search space set.

The DCIs sent on these PDCCH candidates may be the same DCI or different parts of one DCI. Note that the first CORESET and the second CORESET may be set as separate CORESETs (by separate CORESET settings), or may be set as part of the same one CORESET (by one CORESET setting). good.

The control unit 401 may count the number of times of blind decoding of PDCCH candidates considering soft combining applied to multiple CORESETs. For example, when soft combining is applied to two PDCCHs (DCI) transmitted in two CORESETs, control section 401 may count the number of times of decoding as one or two.

The control unit 401 may control reception processing of data (PDSCH) based on DCI. In addition, the control unit 401 transmits the decoding result of DCI or data to the upper layer, and when duplicate packets (DCI or data) are found in the upper layer, at least one of the duplicate packets is discarded. You may

Note that the "plurality of CORESETs" may be different CORESETs corresponding to different TCI states. Each TCI state may correspond to a separate TRP.

(Hardware configuration)
It should be noted that the block diagrams used in the description of the above embodiments show blocks in units of functions. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.

For example, a radio base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the radio communication method of the present disclosure. FIG. 14 is a diagram illustrating an example of hardware configurations of a radio base station and a user terminal according to an embodiment. The radio 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. good.

Note that in the following description, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the radio base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Also, processing may be performed by one processor, or processing may be performed by two or more processors concurrently, serially, or otherwise. Note that processor 1001 may be implemented by one or more chips.

Each function in the radio base station 10 and the user terminal 20 is performed by the processor 1001 by loading predetermined software (program) onto hardware such as the processor 1001 and the memory 1002, and the processing is performed via the communication device 1004. It is realized by controlling communication and controlling at least one of reading and writing data in the memory 1002 and the storage 1003 .

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the above-described baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001. FIG.

The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

The memory 1002 is a computer-readable recording medium, such as ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), and at least other suitable storage media. may be configured by one. The memory 1002 may also be called a register, cache, main memory (main storage device), or the like. The memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). may consist of For example, the transmitting/receiving antenna 101 (201), the amplifier section 102 (202), the transmitting/receiving section 103 (203), the transmission line interface 106, and the like described above may be realized by the communication device 1004.

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

Devices such as the processor 1001 and the memory 1002 are 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 devices.

In addition, the radio base station 10 and the user terminal 20 are microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

(Modification)
The terms explained in this disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, the channel and/or symbols may be signaling. A signal may also be a message. The reference signal may be abbreviated as RS (Reference Signal), or may be called a pilot, a pilot signal, etc. according to the applicable standard. A component carrier (CC: Component Carrier) may also be called a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may consist of one or more periods (frames) in the time domain. Each of the one or more periods (frames) that make up a radio frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may be a fixed time length (eg, 1 ms) independent of numerology.

Here, a numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, transmission and reception specific filtering operations performed by the receiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, and/or the like.

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

A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.

Radio frames, subframes, slots, minislots and symbols all represent units of time in which signals are transmitted. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.

For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or minislot may be called a TTI. may That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.

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

The TTI may be a transmission time unit of channel-encoded data packets (transport blocks), code blocks, codewords, or the like, or may be a processing unit of scheduling, link adaptation, or the like. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a duration of 1 ms may also be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, and so on. A TTI that is shorter than a regular TTI may also 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, and so on.

Note that the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms, and the short TTI (e.g., shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms A TTI having the above TTI length may be read instead.

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 (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve. The number of subcarriers included in an RB may be determined based on neumerology.

Also, an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long. One TTI, one subframe, etc. may each be configured with one or more resource blocks.

Note that one or more RBs are physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, and the like. may be called.

Also, a resource block may be composed of one or more resource elements (RE: Resource Element). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A Bandwidth Part (BWP) (which may also be called a Bandwidth Part) may represent a subset of contiguous common resource blocks (RBs) for a neuron on a carrier. good. Here, the common RB may be identified by an RB index based on the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

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

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 "cell", "carrier", etc. in the present disclosure may be read as "BWP".

It should be noted that the above structures such as radio frames, subframes, slots, minislots and symbols are only examples. For example, the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, etc. can be varied.

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

The names used for parameters and the like in this disclosure are not limiting names in any way. Further, the formulas and the like using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements is not a definitive designation in any way.

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

Also, information, signals, etc. may be output from higher layers to lower layers and/or from lower layers to higher layers. Information, signals, etc. may be input and output through multiple network nodes.

Input/output information, signals, and the like may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.

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

The physical layer signaling may also be called L1/L2 (Layer 1/Layer 2) control information (L1/L2 control signal), L1 control information (L1 control signal), or the like. The RRC signaling may also be called an RRC message, such as an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. Also, MAC signaling may be notified using, for example, a MAC control element (MAC CE (Control Element)).

In addition, notification of predetermined information (for example, notification of “being X”) is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of

The determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Software, instructions, information, etc. may also be sent and received over a transmission medium. For example, the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create websites, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

As used in this disclosure, the terms "system" and "network" may be used interchangeably.

In the present disclosure, "precoding", "precoder", "weight (precoding weight)", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", " Terms such as "number of layers", "rank", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. may be used interchangeably.

In the present disclosure, "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " 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 macrocell, small cell, femtocell, picocell, and the like.

A base station may serve one or more (eg, three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH: Communications services may also be provided by a Remote Radio Head). The terms "cell" or "sector" refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.

In this disclosure, terms such as “Mobile Station (MS),” “user terminal,” “User Equipment (UE),” “terminal,” etc. may be used interchangeably. .

Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.

At least one of a base station and a mobile station may also be called a transmitter, a receiver, and so on. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like. The mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.

Also, the radio base station in the present disclosure may be read as a user terminal. For example, communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) Each aspect/embodiment of the present disclosure may be applied to such a configuration. In this case, the user terminal 20 may have the functions of the radio base station 10 described above. Also, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be read as side channels.

Similarly, user terminals in the present disclosure may be read as radio base stations. In this case, the radio base station 10 may have the functions of the user terminal 20 described above.

In this disclosure, operations described as being performed by a base station may also be performed by its upper node in some cases. In a network that includes one or more network nodes with a base station, various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Obviously, it can be performed by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc. (but not limited to these) or a combination thereof.

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching according to execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.

Each aspect/embodiment described in the present disclosure is LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered Trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (Registered Trademark)), IEEE 802.16 (WiMAX (Registered Trademark)), IEEE 802.16 (Registered Trademark). 20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate wireless communication methods, and extended next-generation systems based on these. Also, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

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

Any reference to elements using the "first," "second," etc. designations 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, references to first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" includes judging, calculating, computing, processing, deriving, investigating, looking up (e.g., a table, searching in a database or another data structure), ascertaining, etc. may be considered to be "determining".

Also, "determining (deciding)" includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.

Also, "determining" is considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. good too. That is, "determining (determining)" may be regarded as "determining (determining)" some action.

Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", or the like.

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

In this disclosure, when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.

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 that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

Where "include," "including," and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising." is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

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

Although the invention according to the present disclosure has been described in detail above, it will be apparent to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in this disclosure. The invention according to the present disclosure can be implemented as modifications and changes without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not impose any limitation on the invention according to the present disclosure.

Claims (4)

a receiver that receives information indicating the relationship between the search space set of the first CORESET (COntrol REsource SET) and the search space set of the second CORESET;
A control unit that monitors a downlink control channel (PDCCH: Physical Downlink Control Channel) candidate in the search space set of the first CORESET and the search space set of the second CORESET,
The control unit uses the same downlink control information ( DCI: Decode Downlink Control Information),
A terminal having QCL (Quasi-Co-Location) information different from the first CORESET and the second CORESET. The control unit decodes the first PDCCH candidate, decodes the second PDCCH candidate, and decodes based on the first PDCCH candidate and the second PDCCH candidate to decode the DCI. , are counted as the number of times of decoding. receiving information indicating a relationship between a first CORESET (COntrol REsource SET) search space set and a second CORESET search space set;
monitoring physical downlink control channel (PDCCH) candidates in the first CORESET search space set and the second CORESET search space set;
The monitoring step includes the same downlink control information based on the first PDCCH candidate monitored in the first CORESET search space set and the second PDCCH candidate monitored in the second CORESET search space set. (DCI: Downlink Control Information) is decoded,
A wireless communication method in a terminal having QCL (Quasi-Co-Location) information different from the first CORESET and the second CORESET. A system comprising a terminal and a base station,
The terminal is
a receiver that receives information indicating the relationship between the search space set of the first CORESET (COntrol REsource SET) and the search space set of the second CORESET;
A control unit that monitors a downlink control channel (PDCCH: Physical Downlink Control Channel) candidate in the search space set of the first CORESET and the search space set of the second CORESET,
The control unit uses the same downlink control information ( DCI: Decode Downlink Control Information),
Having different QCL (Quasi-Co-Location) information from the first CORESET and the second CORESET,
The system, wherein the base station has a transmission unit that transmits the information and the downlink control information.

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