JPWO2019244223A1 - User terminal and wireless communication method - Google Patents

Abstract

The user terminal according to one aspect of the present disclosure has the same downlink control information in each of the receiving unit that receives the setting information related to the search space setting and the plurality of control resource sets (CORESET: COntrol REsource SET) based on the setting information. Has a control unit that controls the reception process of data based on the downlink control information, and the control unit transmits the decoding result of the data to the upper layer and in the upper layer. When duplicate packets are found, at least one of the duplicate packets is discarded. According to one aspect of the present disclosure, the PDCCH can be appropriately monitored even when the multi-TRP (Transmission / Reception Point) is used.

Description

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

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

Successor system of LTE (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 being considered.

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

In high frequency bands such as the millimeter wave band, blocking of radio waves is considered to be a serious problem. In future wireless communication systems (hereinafter, also simply referred to as NR), it is expected that a signal is transmitted using a plurality of transmission / reception points (TRPs) (multi-TRPs) as a solution to this problem. There is.

Further, in NR, the user terminal (UE: User Equipment) has a downlink control channel (for example, PDCCH (Physical Downlink Control Channel)) based on the set control resource set (CORESET) and search space. Is being considered to monitor.

However, if the PDCCH-related control method that has been studied so far is used, delay, UE load, and the like may become problems when supporting multi-TRP, and the communication throughput may decrease.

Therefore, one of the purposes of the present disclosure is to provide a user terminal and a wireless communication method capable of appropriately monitoring PDCCH even when using multi-TRP.

The user terminal according to one aspect of the present disclosure has the same downlink control information in each of the receiving unit that receives the setting information related to the search space setting and the plurality of control resource sets (CORESET: COntrol REsource SET) based on the setting information. Has a control unit that controls the reception process of data based on the downlink control information, and the control unit transmits the decoding result of the data to the upper layer and in the upper layer. When a duplicate packet is found, at least one of the duplicate packets is discarded.

According to one aspect of the present disclosure, the PDCCH can be appropriately monitored even when the multi-TRP is used.

FIG. 1 is a diagram showing an example of communication using a multi-TRP. FIG. 2 is a diagram showing an example of a TRP selection sequence when the network knows the best TRP for the UE. FIG. 3 is a diagram showing 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 showing an example of resource mapping of PDCCH candidates in the second embodiment. 6A and 6B are diagrams showing a search space set setting in the second embodiment and an example of a PDCCH candidate specified based on the setting. FIG. 7A-7C is a diagram showing another example of resource mapping of PDCCH candidates in the second embodiment. FIG. 8 is a diagram showing an example of resource mapping of PDCCH candidates in the third embodiment. FIG. 9 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 10 is a diagram showing an example of the overall configuration of the radio base station according to the embodiment. FIG. 11 is a diagram showing an example of the functional configuration of the radio base station according to the embodiment. FIG. 12 is a diagram showing an example of the overall configuration of the user terminal according to the embodiment. FIG. 13 is a diagram showing an example of the functional configuration of the user terminal according to the embodiment. FIG. 14 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the embodiment.

(CORESET)
In NR, a control resource set (CORESET: COntrol) is used to transmit a physical layer control signal (for example, downlink control information (DCI)) from a base station to a user terminal (UE: User Equipment). REsource SET) is used.

CORESET is an allocation candidate area of a control channel (for example, PDCCH (Physical Downlink Control Channel)). The CORESET may be configured to include a predetermined frequency domain resource and a time domain resource (eg, 1 or 2 OFDM symbols, etc.).

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

The CORESET setting may be notified by, for example, higher layer signaling, or may be represented by a predetermined RRC information element (which may be referred to as a "ControlResourceSet").

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

For MAC signaling, for example, a MAC control element (MAC CE (Control Element)), a MAC PDU (Protocol Data Unit), or the like may be used. The broadcast information may be, for example, a master information block (MIB: Master Information Block), a system information block (SIB: System Information Block), a minimum system information (RMSI: Remaining Minimum System Information), or the like.

A predetermined number (for example, 3 or less) of CORESET may be set for each bandwidth portion (BWP: Bandwidth Part) set in the UE in the serving cell.

Here, the BWP is a partial band set in a carrier (also referred to as a cell, a serving cell, a component carrier (CC: Component Carrier), etc.), and is also called a partial band or the like. The BWP may have a BWP for uplink (UL: Uplink) and a BWP for downlink (DL: Downlink) (DL BWP, downlink BWP). Each BWP to which the predetermined number of CORESETs is given may be a DL BWP.

The CORESET setting may mainly include information on PDCCH resource-related settings and RS-related settings. The following parameters may be given to the UE by higher layer signaling (COREET setting) for CORESET # p (for example, 0 ≦ p <3) set in each DL BWP. That is, the following parameters may be notified (set) to the UE for each CORESET:
-CORESET identifier (CORESET-ID (Identifier)),
-Scramble ID of the demodulation reference signal (DMRS) for PDCCH,
-The time length of CORESET (eg, time duration, CORESET-time-duration), which is indicated by the number of consecutive (consecutive) symbols.
-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 a control channel element (CCE: Control Channel Element) in CORESET to a resource element group (REG: Resource Element Group) (for example, CORESET-CCE-to-REG-mapping) -type),
Information indicating the size (number of REGs in the REG bundle) of the group (REG bundle) including a predetermined number of REGs (for example, CORESET-REG-bundle-size),
-Information (for example, CORESET-shift-index) indicating the cyclic shift (CS: Cyclic Shift, CS amount or CS index) for the interleaver of the REG bundle,
-Transmission setting notification (TCI: Transmission Configuration Indication) status for PDCCH (also referred to as QCL information (antenna port QCL) of the DMRS antenna port for PDCCH reception),
An indication of the presence or absence of a TCI field in a DCI (eg DCI format 1_0 or DCI format 1-11) transmitted by PDCCH within CORESET # p (eg, TCI-PresentInDCI).

In addition, "CORESET-ID # 0" may indicate CORESET (may be called initial CORESET, default CORESET, etc.) set by using MIB.

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

The search space setting may be notified to the UE by, for example, higher layer signaling (RRC signaling or the like), or may be represented by a predetermined RRC information element (may be referred to as “SearchSpace”).

The search space setting mainly includes information on PDCCH monitoring-related settings and decoding-related settings, and may include, for example, information on at least one of the following:
-Search space identifier (search space ID),
-CORESET identifier (CORESET-ID), to which the search space setting is related,
-Information indicating whether it is a common search space (C-SS: Common SS) or a UE-specific search space (UE-SS: UE-specific SS),
・ Number of PDCCH candidates for each aggregation level (AL),
・ Monitoring cycle,
・ Monitoring offset,
-Monitoring patterns in slots (eg 14-bit bitmap).

The UE monitors CORESET based on the search space settings. The UE can determine the correspondence between the CORESET and the search space based on the CORESET-ID included in the search space setting. One 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 with each other. Further, "monitor" may be read as "at least one of blind decoding and blind detection".

(QCL / TCI)
In the NR, the UE receives the reception process (for example, demapping, demodulation, decoding) of the channel (for example, PDCCH, PDSCH) based on the information (QCL information) about the pseudo collocation (QCL: Quasi-Co-Location) of the channel. At least one of) is being considered for control.

Here, the QCL is an index showing the statistical properties of the 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 (delay). It may also mean that it can be assumed that at least one of the spread and the Spatial parameter (eg, the Spatial Rx Parameter) is the same (QCL for at least one of these).

The spatial reception parameter may correspond to the reception beam of the UE (for example, the reception analog beam), or the beam may be specified based on the spatial QCL. The QCL in the present disclosure and at least one element of the QCL may be read as sQCL (spatial QCL).

A plurality of types (QCL types) may be specified for the QCL. For example, four QCL types AD with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters are shown below:
QCL Type A: Doppler shift, Doppler spread, average delay and delay spread,
・ QCL type B: Doppler shift and Doppler spread,
QCL type C: average delay and Doppler shift,
-QCL type D: Spatial reception parameter.

The state (TCI-state) of the transmission configuration indication (TCI: Transmission Configuration Indication or Transmission Configuration Indicator) may indicate (or include) QCL information.

The TCI state (and / or QCL information) is, for example, a target channel (or a reference signal (RS) for the channel) and another signal (for example, another downlink reference signal (DL-RS:)). It may be information about QCL with Downlink Reference Signal)), for example, at least one of information about DL-RS related to QCL (DL-RS related information) and information indicating the above QCL type (QCL type information). May include.

The DL-RS related information may include at least one of the information indicating the DL-RS having a QCL relationship and the information indicating the resource of the DL-RS. For example, when a plurality of reference signal sets (RS sets) are set in the UE, the DL-RS related information has a QCL relationship with a channel (or a port for the channel) among the RSs included in the RS set. At least one of the DL-RS possessed, the 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: Synchronaization Signal), a broadcast channel (PBCH: Physical Broadcast Channel), a synchronization signal block (SSB: Synchronization Signal Block), and a mobility reference signal (SSB: Synchronization Signal Block). At least one or an extension of MRS: Mobility RS), Channel Satate Information-Reference Signal (CSI-RS), Demodulation Reference Signal (DMRS), beam-specific signal, etc. , A signal configured by changing, for example, a signal configured by changing at least one of the density and the period).

The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS: Primary Synchronaization Signal) and a secondary synchronization signal (SSS: Secondary Synchronaization Signal). The SSB may be a signal block including a synchronization signal and a broadcast channel, and may be called an SS / PBCH block or the like.

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

The UE may assume the same sQCL as the PBCH for the type 0 and type 1-PDCCH common search spaces. Further, the UE may determine the sQCL based on the upper layer signaling for the type 3-PDCCH common search space and the UE-specific search space.

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

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

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

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

Also, if the DCI contains an x-bit (eg, x = 3) TCI field, the base station can ^{perform up to 2 x} (eg, 8 if x = 3) TCI states using higher layer signaling. It may be configured in the UE in advance. The value of the TCI field in the DCI (TCI field value) may indicate one of the TCI states preset by higher layer signaling.

When more than 8 types of TCI states are set in the UE, MAC CE may be used to activate (designate) 8 or less types of TCI states. The value of the TCI field in the DCI may indicate one of the TCI states activated by MAC CE.

The UE may determine the QCL of the PDSCH (or DMRS port of the PDSCH) based on the TCI state indicated by the TCI field value in the DCI. For example, the UE assumes that the DMRS port (or DMRS port group) of the PDSCH of the serving cell is the DL-RS and QCL corresponding to the TCI state notified by the DCI, and receives the PDSCH (for example, decrypts). , Demodulation, etc.) may be controlled. Thereby, the reception accuracy of PDSCH can be improved.

(FR1 / FR2)
In the NR, the UE communicates (signal transmission / reception, 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 in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 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 the Sub-Carrier Spacing (SCS).

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

FR2 may be used only in the Time Division Duplex (TDD) band. FR2 may be called a mmW band because it corresponds to a millimeter wave (mmW: millimeter wave) having a wavelength of about 1 mm to 10 mm. The mmW band may be called EHF (Extremely High Frequency).

It should be noted that FR1 and FR2 of the present disclosure are read as a first frequency range and a second frequency range, which are more general expressions not limited to a specific frequency band, respectively. May be done.

(Multi TRP)
In high frequency bands such as the mmW band, blocking of radio waves is considered to be a serious problem, and it is possible to transmit signals using multiple transmission / reception points (TRPs) (multi-TRPs). It is expected as a solution to the problem.

FIG. 1 is a diagram showing an example of communication using a multi-TRP. In this example, two TRPs (TRP # 1 and # 2) can send a signal to the UE (eg, the two TRPs provide the serving cell of the UE). In the UE, even if the reception quality of the signal from one of the TRPs deteriorates, communication can be maintained if the reception quality of the signal from the other TRP is higher than a certain level.

However, considering the specific case of operating the multi-TRP, there are further matters to be considered. The items to be examined will be described below with reference to FIG. 2-4.

FIG. 2 is a diagram showing an example of a TRP selection sequence when the network knows the best TRP for the UE. At the first point in the illustration, it is assumed that the best TRP for the UE is TRP # 1.

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

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

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

In step S14, the network needed to change the TRP for the UE based on the L1-RSRP (eg, the L1-RSRP fell below a predetermined threshold, the L1-RSRP could not be received for a period of time. To understand that.

In step S15, the network (eg, TRP # 2) sends a MAC CE to the UE to activate the TCI state indicating that it is an RS and QCL from TRP # 2 for the one CORESET. To do.

In the example of FIG. 2, the multi-TRP can be controlled by using the TCI state setting function for CORESET, which has been studied so far in Rel-15 NR. However, the control of the TCI state of the PDCCH based on the RRC settings and MAC CE activation is very slow, and it is also necessary to schedule the PDSCH to transmit the MAC CE.

FIG. 3 is a diagram showing 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) sets two CORESETs for the UE. Here, one CORESET is a CORESET (CORESET # 1) having a TCI state indicating that it is an RS and a QCL from TRP # 1, and the other CORESET is an RS and a QCL from TRP # 2. It is a CORESET (CORESET # 2) having a TCI state indicating that.

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

In step S23, the UE reports L1-RSRP based on the activated TCI status. 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 two CORESETs based on different TCI state settings.

In step S24, the network knows that it has become necessary to change the TRP for the UE based on L1-RSRP.

In the example of FIG. 3-4, if a plurality of CORESETs corresponding to a plurality of TCI state settings are set in the UE, the network does not need to grasp the best TRP in advance. However, since the number of CORESETs for each DL BWP is limited to a predetermined number (for example, 3), the maximum number of multi-TRPs is also limited. In addition, the number of PDCCH candidates monitored by the UE increases by the set number of CORESETs, and the processing load of the UE increases.

As described above, when the PDCCH-related control method studied so far is used, delay, UE load, and the like become problems when supporting multi-TRP, and communication throughput may decrease.

Therefore, the present inventors have conceived a method of appropriately monitoring 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 methods according to each embodiment may be applied individually or in combination.

(Wireless communication method)
<First Embodiment>
In the first embodiment, the TCI state for PDCCH may be set with a finer particle size than the CORESET unit.

For example, the TCI state for PDCCH may be configurable for each search space setting (in search space setting units). The "search space setting", "search space set", "search space set setting", etc. of the present disclosure may be read as each other.

In the examination of the existing NR, the TCI state for PDCCH (CORESET) was set for each 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 in the RRC. ..

The TCI state for PDCCH may be configurable for each aggregation level (AL) for certain search space settings. For example, the TCI state for PDCCH may be set to a different TCI state at AL = 1, 2, 4, 8 or the like for a certain search space setting.

The TCI state for PDCCH may be set for each PDCCH candidate for a certain search space setting. For example, the TCI state for PDCCH may be set to a different TCI state for each index of PDCCH candidates for a certain search space setting.

In the first embodiment, the TCI state parameter may be included in the search space setting (SearchSpace information element of RRC). The UE includes a TCI state parameter in the search space setting, and the TCI state for the CORESET associated with the search space ID of the search space setting is determined based on the search space setting, not the CORESET setting information of the CORESET. (That is, the tci-States PDCCH in the ControlResourceSet may be ignored).

The search space setting (SearchSpace information element of RRC) may include at least one of the TCI state parameters for each AL and the TCI state parameters for each PDCCH candidate. The UE may determine the TCI state for PDCCH based on at least one of the AL unit and the PDCCH candidate unit based on the parameter.

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

<Second embodiment>
In the second embodiment, one PDCCH candidate may be capable of being 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 set more than one CORESET.

For example, the network may send PDCCH candidates according to the following methods:
(1) A part of a certain PDCCH candidate corresponding to CORESET # 1 (TCI state is related to TRP # 1) is transmitted by TRP # 1.
(2) A part of the PDCCH candidates corresponding to CORESET # 2 (the TCI state is related to 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 portion of (1) and the PDCCH candidate portion of (2) for soft combining. In the present disclosure, "soft composition" may be read as "synthesis", "decoding", "error correction" and the like.

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

If one PDCCH candidate or AL is mapped to more than one CORESET, the PDCCH candidate or AL may be separated into subsets related to different CORESETs.

6A and 6B are diagrams showing a search space set setting in the second embodiment and an example of a PDCCH candidate specified based on the setting. As shown in FIG. 6A, the UE may receive information on the search space set setting including a plurality of CORESET-IDs (IDs # 1 and # 2 in this example).

The UE may perform reception processing on the assumption that the PDCCH candidate in the search space corresponding to the search space set setting is transmitted over each of the CORESET IDs # 1 and # 2 as shown in FIG. 6B.

In the example of FIG. 6B, the frequency resource of the PDCCH over the plurality of CORESETs is the same over the plurality of CORESETs, but is not limited to this. For each portion of the PDCCH, different radio resources (eg, frequency and time resources) may be applied based on the corresponding CORESET settings.

FIG. 7A-7C is a diagram showing another example of resource mapping of PDCCH candidates in the second embodiment.

FIG. 7A shows an example in which the frequency resource of each CORESET included in one PDCCH candidate is a REG bundle unit. The UE is a resource whose unit is at least one such as CCE, CCE group, REG, REG bundle, PRB, etc., based on the CORESET setting specified by the CORESET ID. Amount) may be determined. When monitoring one PDCCH candidate over a plurality of CORESETs, the UE may determine the amount of resources of each CORESET portion based on the respective CORESET settings.

FIG. 7B shows an example in which both the time and frequency resources of each CORESET included in one PDCCH candidate are different. In this example, CORESET # 1 has one symbol length and CORESET # 2 has two symbol lengths. Further, the frequency resource of the CORESET # 1 portion of the PDCCH candidate is larger than that of the CORESET # 2 portion.

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

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

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

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

The UE does not have to soft-synthesize the repeatedly transmitted DCI, or may soft-synthesize it. Further, the UE does not have to soft-synthesize the data (PDSCH) scheduled by the repeatedly transmitted DCI, or may soft-synthesize the data (PDSCH). Hereinafter, the case where the UE does not softly synthesize the DCI (and the data corresponding to the DCI) repeatedly transmitted in different search space sets (the embodiment 3.1) and the case where the software synthesizes the DCI (the data corresponding to the DCI) (the embodiment 3.2). , Will be described respectively.

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

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

In addition, the UE transfers the decoded DCI or data (DL shared channel (DL-SCH)) to an upper layer (for example, MAC layer, PDCP (Packet Data Convergence Protocol) layer, RLC (Radio Link Control) layer, RRC layer, IP. (Internet Protocol) Transmit to at least one layer, etc.).

When a duplicated (or the same content) packet (which may be read as data, control information, etc.) is found in the upper layer, the UE discards at least one of the duplicated packets. (Discard) may be used. This packet is at least one of an IP packet, an RLC service data unit (SDU), an RLC protocol data unit (PDU), a PDCP SDU, a PDCP PDU, a MAC SDU, a MAC PDU, and the like. May be good. Note that "discard" may be read as "ignore", "drop", or the like.

[Embodiment 3.2]
The UE may set information indicating that a PDCCH candidate in one search space set is associated with a PDCCH candidate in another search space set by higher layer signaling. The information may be, for example, information indicating that a PDCCH candidate in a certain search space set and a PDCCH candidate in another search space set are softly synthesized.

The UE may determine the number of blind decodings of the PDCCH candidate based on soft synthesis. For example, the UE may count the number of blind decodings of PDCCH candidates based on the number of PDCCH candidates after soft synthesis (the number of DCIs whose contents may differ from the total PDCCH (DCI)). Even if the UE has two PDCCH candidates before soft synthesis, when applying soft synthesis to these PDCCH candidates, the UE may assume that the number of blind decodings for these PDCCH candidates is 1. Good.

Further, the UE may count the number of blind decodings of PDCCH candidates based on the number of PDCCH candidates before software synthesis (the number of all PDCCH (DCIs) (DCIs having the same contents are also counted in duplicate)). .. If there are two PDCCH candidates before soft synthesis, the UE may assume that the number of blind decodings for these PDCCH candidates is 2, even when soft synthesis is applied to these PDCCH candidates. Good.

The method of counting the number of blind decodings may be applied to other embodiments.

According to the third embodiment described above, if at least one of the repeatedly transmitted DCIs is successfully decoded, the PDSCH of each TRP may be decoded, and TRP diversity can be preferably realized.

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

For example, the UE may monitor (decode) a PDCCH candidate across multiple CORESETs that are shown to have DL RSs and QCLs with the same TCI state of TRP # 1.

Further, when at least one of the above-described embodiments is used, the UE uses one PDCCH using signals transmitted from different sTRPs by a plurality of radio resources in which communication using the multi-TRP is set. It may be assumed that decoding of the candidate is set.

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

FIG. 9 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) that integrates a plurality of fundamental frequency blocks (component carriers) with the system bandwidth (for example, 20 MHz) of the LTE system 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), and 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these may be called.

The radio communication system 1 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. , Is equipped. Further, a user terminal 20 is arranged in the macro cell C1 and each small cell C2. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 at the same time by using CA or DC. Further, the user terminal 20 may apply CA or DC using a plurality of cells (CC).

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

Further, the user terminal 20 can perform communication in each cell using Time Division Duplex (TDD) and / or Frequency Division Duplex (FDD). Further, in each cell (carrier), a single numerology may be applied, or a plurality of different numerologies may be applied.

The numerology may be a communication parameter applied to the transmission and / or reception of a signal and / or channel, eg, subcarrier spacing, bandwidth, symbol length, cyclic prefix length, subframe length. , TTI length, number of symbols per TTI, radio frame configuration, specific filtering process performed by the transmitter / receiver in the frequency domain, specific windowing process performed by the transmitter / receiver in the time domain, and the like. For example, if the subcarrier spacing of the constituent OFDM symbols is different and / or the number of OFDM symbols is different for a certain physical channel, it may be said that the numerology is different.

The radio base station 11 and the radio base station 12 (or between the two radio base stations 12) are connected by wire (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or by radio. May be done.

The radio base station 11 and each radio base station 12 are each connected to the host station device 30, and are connected to the core network 40 via the host station device 30. The host station device 30 includes, but is not limited to, an access gateway device, a wireless network controller (RNC), a mobility management entity (MME), and the like. Further, each radio base station 12 may be connected to the host station apparatus 30 via the radio base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. Further, the radio base station 12 is a radio base station having local coverage, and is 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), and transmission / reception. It may be called a point or the like. Hereinafter, when the radio base stations 11 and 12 are not distinguished, they are collectively referred to as the radio base station 10.

Each user terminal 20 is a terminal corresponding to various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

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

OFDMA is a multi-carrier transmission system in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), data is mapped to each subcarrier, and communication is performed. SC-FDMA is a single carrier transmission that reduces interference between terminals by dividing the system bandwidth into a band composed of one or a continuous resource block for each terminal and using different bands for a plurality of terminals. It is a method. The uplink and downlink wireless access methods are not limited to these combinations, and other wireless access methods may be used.

In the wireless communication system 1, as downlink channels, downlink shared channels (PDSCH: Physical Downlink Shared Channel), broadcast channels (PBCH: Physical Broadcast Channel), downlink L1 / L2 control channels, etc. shared by each user terminal 20 are used. Used. User data, upper layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. In addition, 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) including scheduling information of PDSCH and / or PUSCH is transmitted by PDCCH.

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

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

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

In the wireless communication system 1, the downlink reference signal includes a cell-specific reference signal (CRS), a channel state information-reference signal (CSI-RS), and a demodulation reference signal (DMRS:). DeModulation Reference Signal), Positioning Reference Signal (PRS), etc. are transmitted. Further, in the wireless communication system 1, a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), and the like are transmitted as uplink reference signals. The DMRS may be called a user terminal specific reference signal (UE-specific reference signal). Further, the reference signal to be transmitted is not limited to these.

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

The user data transmitted from the radio base station 10 to the user terminal 20 by the downlink is input from the host station apparatus 30 to the baseband signal processing unit 104 via the transmission line interface 106.

The baseband signal processing unit 104 processes user data in the PDCP (Packet Data Convergence Protocol) layer, divides / combines user data, performs RLC layer transmission processing such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access). Control) Transmission processing such as retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, etc. is performed in the transmission / reception unit. Transferred to 103. Further, the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

The transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 into a radio frequency band and transmits the signal. The radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101. The transmitter / receiver 103 may consist of a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical fields according to the present disclosure. The transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.

On the other hand, as for the uplink signal, the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmission / reception unit 103 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

The baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing, and error correction for the user data included in the input uplink signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed, and the data is transferred to the host station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, etc.) of the communication channel, status 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 host station apparatus 30 via a predetermined interface. Further, the transmission line interface 106 transmits / receives a signal (backhaul signaling) to / from another radio base station 10 via an inter-base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). You may.

The transmission / reception unit 103 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit is composed of an analog beamforming circuit (for example, a phase shifter, a phase shift circuit) or an analog beamforming device (for example, a phase shifter) described based on common recognition in the technical field according to the present invention. You may. Further, the transmission / reception antenna 101 may be configured by, for example, an array antenna.

FIG. 11 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment of the present disclosure. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the radio base station 10 also has other functional blocks necessary for wireless communication.

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

The control unit (scheduler) 301 controls the entire radio base station 10. The control unit 301 can be composed of a controller, a control circuit, or a control device described based on the common recognition in the technical field according to the present disclosure.

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

The control unit 301 schedules system information, downlink data signals (for example, signals transmitted by PDSCH), downlink control signals (for example, signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resources). Allocation) is controlled. Further, the control unit 301 controls the generation of the downlink control signal, the downlink data signal, and the like based on the result of determining the necessity of the retransmission control for the uplink data signal.

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

The control unit 301 uses an uplink data signal (for example, a signal transmitted by PUSCH), an uplink control signal (for example, a signal transmitted by PUCCH and / or PUSCH, delivery confirmation information, etc.), and a random access preamble (for example, PRACH). Controls scheduling of transmitted signals), uplink reference signals, etc.

The control unit 301 uses the digital BF (for example, precoding) in the baseband signal processing unit 104 and / or the analog BF (for example, phase rotation) in the transmission / reception unit 103 to form a transmission beam and / or a reception beam. May be done. The control unit 301 may perform control to form a beam based on the downlink propagation path information, the uplink propagation path information, and the like. These propagation path information may be acquired from the received signal processing unit 304 and / or the measuring unit 305.

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

The transmission signal generation unit 302 generates, for example, a DL assignment for notifying the downlink data allocation information and / or a UL grant for notifying the uplink data allocation information based on an instruction from the control unit 301. Both DL assignments and UL grants are DCI and follow the DCI format. Further, the downlink data signal is coded and modulated according to a coding rate, a modulation method, and the like determined based on channel state information (CSI) from each user terminal 20 and the like.

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

The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 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 composed of a signal processor, a signal processing circuit, or a signal processing device described based on the common recognition in the technical field according to the present disclosure.

The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, HARQ-ACK is output to the control unit 301. Further, the reception signal processing unit 304 outputs the reception signal and / or the signal after the reception processing to the measurement unit 305.

The measuring unit 305 performs measurement on the received signal. The measuring unit 305 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common recognition in the technical field according to the present disclosure.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, or the like based on the received signal. The measuring unit 305 has received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)). , Signal strength (for example, RSSI (Received Signal Strength Indicator)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 301.

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

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

The radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202. The transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception unit 203 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing unit 204. The transmitter / receiver 203 may consist of a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical fields according to the present disclosure. The transmission / reception unit 203 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.

The baseband signal processing unit 204 performs FFT processing, error correction / decoding, retransmission control reception processing, and the like on the input baseband signal. The 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. Further, among the downlink data, the broadcast information may also be transferred to the application unit 205.

On the other hand, the uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like, and is performed in the transmission / reception unit. Transferred to 203.

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

The transmission / reception unit 203 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit is composed of an analog beamforming circuit (for example, a phase shifter, a phase shift circuit) or an analog beamforming device (for example, a phase shifter) described based on common recognition in the technical field according to the present invention. You may. Further, the transmission / reception antenna 201 may be configured by, for example, an array antenna.

FIG. 13 is a diagram showing an example of the functional configuration of the user terminal according to the embodiment. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

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

The control unit 401 controls the entire user terminal 20. The control unit 401 can be composed of a controller, a control circuit, or a control device described based on the common recognition in the technical field according to the present disclosure.

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

The control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the radio base station 10 from the reception signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on the result of determining the necessity of retransmission control for the downlink control signal and / or the downlink data signal.

The control unit 401 controls to form a transmission beam and / or a reception beam by using the digital BF (for example, precoding) in the baseband signal processing unit 204 and / or the analog BF (for example, phase rotation) in the transmission / reception unit 203. May be done. The control unit 401 may perform control to form a beam based on the downlink propagation path information, the uplink propagation path information, and the like. These propagation path information may be acquired from the received signal processing unit 404 and / or the measuring unit 405.

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

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

The transmission signal generation unit 402 generates an uplink control signal regarding delivery confirmation information, channel state information (CSI), and the like, for example, based on an instruction from the control unit 401. Further, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the downlink control signal notified from the radio base station 10 includes a UL grant.

Based on the instruction from the control unit 401, the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to the radio resource and outputs it to the transmission / reception unit 203. The mapping unit 403 can be composed of a mapper, a mapping circuit, or a mapping device described based on the common recognition in the technical field according to the present disclosure.

The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 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 composed of a signal processor, a signal processing circuit, or a signal processing device described based on the common recognition in the technical field according to the present disclosure. Further, the reception signal processing unit 404 can form a reception unit according to the present disclosure.

The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. Further, the reception signal processing unit 404 outputs the reception signal and / or the signal after the reception processing to the measurement unit 405.

The measuring unit 405 performs measurement on the received signal. For example, the measuring unit 405 may perform the same frequency measurement and / or the different frequency measurement with respect to one or both of the first carrier and the second carrier. When the serving cell is included in the first carrier, the measuring unit 405 may perform the different frequency measurement in the second carrier based on the measurement instruction acquired from the received signal processing unit 404. The measuring unit 405 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common recognition in the technical field according to the present disclosure.

For example, the measuring unit 405 may perform RRM measurement, CSI measurement, or the like based on the received signal. The measuring unit 405 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 401.

The transmission / reception unit 203 may receive downlink control information (DCI) (DL assignment, etc.) for scheduling a downlink shared channel (for example, PDSCH). The transmission / reception unit 203 may receive setting information related to the search space setting (for example, SearchSpace information element), setting information related to CORESET (for example, ControlResourceSet information element), and the like from the radio base station 10.

The control unit 401 is a PDCCH (Physical Downlink Control Channel) candidate included in a certain control resource set (CORESET: COntrol REsource SET) based on the above setting information (at least one of the setting information related to the search space setting and the setting information related to CORESET). Alternatively, the state (TCI-state) of the transmission configuration indicator (TCI) for each aggregation level may be determined (may be called identification, judgment, etc.).

Based on the above setting information, the control unit 401 may assume that one PDCCH candidate is mapped (may be expressed as being mapped, assigned, transmitted, etc.) across a plurality of CORESETs.

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

The control unit 401 may determine that PDCCH candidates in a plurality of search spaces are soft-synthesized based on the above setting information. For example, the control unit 401 sets a PDCCH candidate of the first search space set corresponding to a part of the plurality of CORESETs (for example, the first CORESET) based on the above setting information, and another PDCCH candidate of the plurality of CORESETs. Software synthesis may be performed with PDCCH candidates of the second search space set corresponding to a part (for example, the second CORESET).

The DCIs transmitted by these PDCCH candidates may be the same DCI or different parts of one DCI. The first CORESET and the second CORESET may be set as separate CORESETs (by different CORESET settings), or may be set as a part of the same one CORESET (by one CORESET setting). Good.

The control unit 401 may count the number of blind decodings of the PDCCH candidate in consideration of the software synthesis applied to the plurality of CORESETs. For example, when soft synthesis is applied to two PDCCHs (DCIs) transmitted by two CORESETs, the control unit 401 may count the number of decodings as one or two.

The control unit 401 may control the reception process of data (PDSCH) based on DCI. Further, the control unit 401 transmits the decoding result of DCI or data to the upper layer, and when a duplicate packet (DCI or data) is found in the higher layer, discards at least one of the duplicate packets. You may.

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

(Hardware configuration)
The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices.

For example, the wireless base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 14 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the 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.

In the following description, the word "device" can be read as a circuit, a device, a 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 the devices shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors. The processor 1001 may be mounted by one or more chips.

For each function of the radio base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an calculation and the communication device 1004 is used. It is realized by controlling communication and controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

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

Further, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.

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

The storage 1003 is a computer-readable recording medium, and is, for example, a flexible disc, a floppy (registered trademark) disc, an optical magnetic disc (for example, a compact disc (CD-ROM (Compact Disc ROM), etc.)), a digital versatile disc, At least one of Blu-ray® disks, removable disks, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of. The storage 1003 may be referred to as an auxiliary storage device.

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

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an 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. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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

Further, the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Modification example)
The terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot (Pilot), a pilot signal, or the like depending on the applied standard. Further, the component carrier (CC: Component Carrier) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

The radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.

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

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

Radio frames, subframes, slots, mini-slots and symbols all represent time units when transmitting signals. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each. The time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.

For example, one subframe may be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may be referred to as a TTI, and one slot or one minislot may be referred to as a TTI. You 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. It may be. The unit representing TTI may be called a slot, a 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, the radio base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

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

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

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, and the like. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

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

The RB may also include one or more symbols in the time domain and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (RE: Resource Element). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. Good. Here, the common RB may be specified by the index of the RB with respect to 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 more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as a wireless frame, a subframe, a slot, a mini slot, and a symbol are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.

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

The names used for parameters and the like in the present disclosure are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly 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 limited name in any way.

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

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

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

The notification of information is not limited to the embodiments / embodiments described in the present disclosure, and may be performed by other methods. For example, information notification includes physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, etc.). It may be carried out 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 be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRCConnectionSetup message, an RRCConnectionReconfiguration message, or the like. Further, MAC signaling may be notified using, for example, a MAC control element (MAC CE (Control Element)).

In addition, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).

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

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

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

The terms "system" and "network" used in this disclosure 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" can be used interchangeably.

In the present disclosure, "Base Station (BS)", "Wireless 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" and the like can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by Remote Radio Head)). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" 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. , Handset, user agent, mobile client, client or some other suitable term.

At least one of a base station and a mobile station may be referred to as a transmitting device, a receiving device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.

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

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

In the present disclosure, the operation performed by the base station may be performed by its upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal are performed by one or more network nodes other than the base station and the base station (for example, the base station). It is clear that 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, in combination, or switched with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

Each aspect / embodiment described in the present disclosure 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), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered Trademarks) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), LTE 802. 20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other systems using appropriate wireless communication methods, next-generation systems extended based on these, and the like may be applied. In addition, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference to elements using designations such as "first", "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

The term "determining" as used in the present disclosure may include a wide variety of actions. For example, "judgment" means judging, calculating, computing, processing, deriving, investigating, looking up (eg, table, table, etc.). It may be considered to be "judgment (decision)" of searching in a database or another data structure, ascertaining, and the like.

In addition, "judgment (decision)" includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as "judgment (decision)" such as "accessing" (for example, accessing data in memory).

In addition, "judgment (decision)" is regarded as "judgment (decision)" of solving, selecting, selecting, establishing, comparing, and the like. May be good. That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

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

The terms "connected", "coupled", or any variation thereof, as used herein, are any direct or indirect connection or connection between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are "connected" or "joined" to each other. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access".

In the present disclosure, when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-comprehensive examples, the radio frequency domain, microwaves. It can be considered to be "connected" or "coupled" to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, 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 mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

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

In the present disclosure, if articles are added by translation, for example 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 is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as an amended or modified mode 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 purposes of illustration and does not bring any limiting meaning to the invention according to the present disclosure.

Claims (2)

A receiver that receives setting information related to search space settings,
Based on the setting information, it is assumed that the same downlink control information is transmitted in each of a plurality of control resource sets (CORESET: COntrol REsource SET), and a control unit that controls data reception processing based on the downlink control information. Have,
The control unit transmits the decoding result of the data to an upper layer, and when a duplicate packet is found in the upper layer, the user terminal is characterized in that at least one of the duplicate packets is discarded. .. Steps to receive configuration information about search space settings and
Based on the setting information, assuming that the same downlink control information is transmitted in each of a plurality of control resource sets (CORESET: COntrol REsource SET), a step of controlling data reception processing based on the downlink control information, and a step of controlling data reception processing.
Wireless communication comprising: transmitting the decoding result of the data to an upper layer, and discarding at least one of the duplicate packets when a duplicate packet is found in the upper layer. Method.

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