WO2019215895A1 - User terminal - Google Patents

Abstract

Provided is a user terminal of one embodiment of the present disclosure that is characterized in including: a receiving unit that receives downlink control information (DCI) for scheduling a downlink shared channel; and a control unit that determines pseudo-collocation for the downlink shared channel on the basis of the transmission configuration indication (TCI) state corresponding to the identifier (CORESET-ID) of the smallest control resource set (CORESET) in the latest slot if the time offset between reception of the DCI and the downlink shared channel is smaller than a prescribed threshold. According to one embodiment of the present disclosure, it is possible to receive a PDSCH on the basis of an appropriate QCL.

Description

User terminal

The present disclosure relates to a user terminal 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 data rate, low delay, etc. (Non-patent Document 1). In addition, LTE-A (LTE Advanced, LTE Rel. 10, 11, 12, 13) was specified for the purpose of further increasing the capacity and sophistication of LTE (LTE Rel. 8, 9).

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

In future wireless communication systems (hereinafter also simply referred to as NR), it is considered to perform communication using beam forming (BF). In order to improve communication quality using BF, at least one of signal transmission and reception is controlled in consideration of a pseudo-co-location (QCL) relationship (QCL relationship) between a plurality of signals. It is being considered.

Specifically, the user terminal (UE: User Equipment) has a QCL indicated by a value of a predetermined field in the DCI (for example, a field for transmission configuration indication (TCI: Transmission Configuration Indication or Transmission Configuration Indicator) (TCI field)). Based on the relationship (which may be called a TCI state or the like), it is considered to control reception of a downlink shared channel (for example, PDSCH) scheduled by the DCI.

In a specific case, it is considered to determine the TCI state of the PDSCH based on a control resource set (CORESET: Control Resource Set). However, there are cases where it is not clear what CORESET is used as the CORESET. If this is not clearly defined, there is a problem that the UE cannot perform PDSCH reception processing based on appropriate QCL and throughput is reduced.

Therefore, an object of the present disclosure is to provide a user terminal that can receive PDSCH based on appropriate QCL.

A user terminal according to an aspect of the present disclosure includes a reception unit that receives downlink control information (DCI: Downlink Control Information) for a downlink shared channel schedule, and a time offset between reception of the DCI and the downlink shared channel Is smaller than a predetermined threshold, based on the transmission configuration indication (TCI) state corresponding to the identifier (CORESET-ID) of the smallest control resource set (CORESET: Control REsource SET) in the latest slot, And a control unit that determines pseudo-collocation for the downlink shared channel.

According to one aspect of the present disclosure, PDSCH can be received based on appropriate QCL.

1A and 1B are diagrams illustrating an example of “minimum CORESET-ID in the latest slot” according to Embodiment 2.1. 2A and 2B are diagrams illustrating an example of “minimum CORESET-ID in the latest slot” in the embodiment 2.2. FIG. 3 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 4 is a diagram illustrating an example of an overall configuration of a radio base station according to an embodiment. FIG. 5 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment. FIG. 6 is a diagram illustrating an example of an overall configuration of a user terminal according to an embodiment. FIG. 7 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment. FIG. 8 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment.

(CORESET)
In NR, in order to transmit a physical layer control signal (for example, downlink control information (DCI)) from the base station to the UE, a control resource set (CORESET: CONtrol REsource SET) is used. .

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

The UE may receive CORESET setting information (which may be referred to as 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 terminal itself.

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

Here, the upper layer signaling may be, for example, 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), and minimum system information (RMSI: Remaining Minimum System Information).

CORESET may be set to a predetermined number (for example, 3 or less) for each bandwidth part (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)), and is also referred to as a partial band. The BWP may include a BWP for uplink (UL) (UL BWP, uplink BWP) and a BWP for downlink (DL: Downlink) (DL BWP, downlink BWP). Each BWP provided with the predetermined number of CORESETs 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 upper layer signaling (CORESET 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)),
A scramble ID of a demodulation reference signal (DMRS) for PDCCH,
CORESET time length indicated by the number of consecutive symbols (eg, time duration, CORESET-time-duration),
Frequency-domain resource allocation (for example, information (CORESET-freq-dom) indicating a predetermined number of resource blocks constituting the CORESET),
Mapping type (information indicating interleaving or non-interleaving) from a control channel element (CCE) to a resource element group (REG) in CORESET (for example, CORESET-CCE-to-REG-mapping) -type),
Information indicating the size of the group (REG bundle) including the predetermined number of REGs (number of REGs in the REG bundle) (for example, CORESET-REG-bundle-size),
Information indicating a cyclic shift (CS: Cyclic Shift, CS amount or CS index) for the interleaver of the REG bundle (for example, CORESET-shift-index),
-PDCCH transmission configuration notification (TCI: Transmission Configuration Indication) state (also referred to as QCL information (antenna port QCL) etc. of DMRS antenna port for PDCCH reception),
Indication of presence / absence of a TCI field in DCI (for example, DCI format 1_0 or DCI format 1_1) transmitted by PDCCH in CORESET # p (for example, TCI-PresentInDCI).

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

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

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

UE monitors CORESET based on search space setting. 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, “monitoring of CORESET”, “monitoring of search space (PDCCH candidate) associated with CORESET”, “monitoring of downlink control channel (eg, PDCCH)”, and “monitoring of downlink control information (DCI)” "May be interchanged with each other. “Monitor” may be read as “at least one of blind decoding and blind detection”.

(QCL)
In NR, the UE performs reception processing (for example, demapping, demodulation, decoding) on a channel (for example, PDCCH, PDSCH) based on information (QCL information) on pseudo-colocation (QCL: Quasi-Co-Location). Of at least one of the above is under consideration.

Here, QCL is an index indicating the statistical properties of the channel. For example, when one signal and another signal have a QCL relationship, a Doppler shift, a Doppler spread, an average delay, and a delay spread (delay) are set between these different signals. It may mean that at least one of (spread) and a spatial parameter (for example, a spatial reception parameter (Spatial Rx Parameter)) is the same (QCL is related to at least one of them).

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

A plurality of types (QCL types) of the QCL may be defined. For example, four QCL types AD with different parameters (or parameter sets) that can be assumed to be the same may be provided, which 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 of the transmission configuration instruction (TCI: Transmission Configuration Indication or Transmission Configuration Indicator) (TCI state (TCI-state)) may indicate (may include) QCL information. The TCI state is roughly classified into a TCI state for PDCCH and a TCI state for PDSCH.

The TCI state (and / or QCL information) includes, for example, a target channel (or a reference signal (RS: Reference Signal) for the channel) and another signal (for example, another downlink reference signal (DL-RS: For example, at least one of information related to QCL (DL-RS related information) and information indicating the above QCL type (QCL type information). May be included.

The DL-RS related information may include at least one of information indicating a DL-RS having a QCL relationship and information indicating a 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 indicates a QCL relationship with a channel (or a port for the channel) among RSs included in the RS set. At least one of a DL-RS having the DL-RS and a resource for the DL-RS may be indicated.

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

The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS: Primary Synchronization Signal) and a secondary synchronization signal (SSS: Secondary Synchronization Signal). The SSB may be a signal block including a synchronization signal and a broadcast channel, and may be referred to as an SS / PBCH block.

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

For example, for each CORESET, one or more (K) TCL states may be set by higher layer signaling. In addition, the UE may activate one or a plurality of TCI states for each CORESET using MAC CE.

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

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

The TCI field may be configured with a predetermined number of bits (for example, 3 bits). Whether or not the TCI field is included in the DCI may be controlled by information notified from the base station to the UE. The information may be information (TCI-PresentInDCI) indicating whether or not a TCI field exists in DCI (present or absent). The TCI-PresentInDCI may be set in the UE by, for example, higher layer signaling (RRC information element (IE: Information Element)).

For example, TCI-PresentInDCI is enabled (TCI-PresentInDCI) in predetermined upper layer control information (eg, “ControlResourceSet” IE for setting at least one of CORESET time resource and frequency resource). May be included. On the other hand, the fact that the TCI-PresentInDCI is disabled or not enabled may mean that the TCI-PresentInDCI is not included in the higher layer control information.

When TCI-PresentInDCI is not enabled (not enabled), the TCI field in DCI is 0 bit, and when TCI-PresentInDCI is enabled, the TCI field in DCI may be 3 bits. .

In addition, when the DCI includes a TCI field of x bits (for example, x = 3), the base station can use a maximum of 2 ^x (for example, 8 for x = 3) types of TCI states using higher layer signaling. The UE may be configured in advance. The value of the TCI field (TCI field value) in the DCI may indicate one of the TCI states set in advance by higher layer signaling.

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

UE may determine QCL of PDSCH (or DMSCH port of PDSCH) based on TCI state indicated by TCI field value in 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 DCI, and performs PDSCH reception processing (for example, decoding) , Demodulation, etc.) may be controlled. Thereby, the reception precision of PDSCH can be improved.

When the TCI-PresentInDCI for CORESET for scheduling the PDSCH is valid, the UE may assume that the TCI field is present (included) in the DL DCI of the PDCCH transmitted in the CORESET.

When the TCI-PresentInDCI for CORESET for scheduling the PDSCH is invalid or when the PDSCH is scheduled according to the DCI format 1_0, in determining the antenna port QCL of the PDSCH, the TCI state for the PDSCH is It may be assumed that it is identical to the TCI state applied to CORESET used for PDCCH transmission. The antenna port (port) in the present disclosure may be read as an antenna port group (port group).

By the way, when the time offset between the reception of DL DCI and the reception of PDSCH corresponding to the DCI is equal to or greater than a predetermined threshold (may be called Threshold-Sched-Offset, etc.), the UE It may be assumed that the RS in the RS set for the QCL type parameter given by the indicated TCI state and the antenna port of one or more DMRS port groups of the PDSCH of the serving cell are QCL. The predetermined threshold may be based on UE capability, for example, based on a delay for PDCCH decoding and beam switching. The information on the predetermined threshold may be set from the base station using higher layer signaling, or may be transmitted from the UE to the base station.

In addition, when TCI-PresentInDCI is both valid and invalid, if the time offset between the reception of DL DCI and the PDSCH corresponding to the DCI is less than the predetermined threshold, the UE Based on the TCI state used for PDCCH QCL notification corresponding to the minimum CORESET-ID (ID for CORESET identification) in the latest (latest) slot where one or more CORESET is set, The antenna port of one or more DMRS port groups of the serving cell PDSCH is QCL (eg, the DL-RS and QCL based on the TCI state activated for the CORESET corresponding to the minimum CORESET-ID. ) May be assumed It is being considered.

However, as described above, since the time position of CORESET is specified by the search space, it is not clear what CORESET corresponds to the “minimum CORESET-ID in the latest slot” in the examination. If this is not clearly defined, the UE cannot perform PDSCH reception processing based on appropriate QCL, which may reduce throughput.

Therefore, the present inventors appropriately grasp the “minimum CORESET-ID in the latest slot” and determine the PDSCH even if the time offset between the DL DCI and the PDSCH scheduled by the DCI is smaller than a predetermined threshold. The idea was to decrypt (receive).

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

Note that “minimum CORESET-ID” in the present disclosure may be read as “minimum CORESET-ID corresponding to CORESET”.

(Wireless communication method)
<First Embodiment>
In the first embodiment, the UE uses the “minimum CORESET-ID in the latest slot” to be used when the above time offset is less than the predetermined threshold, the monitoring period set by the search space setting, and Regardless of one or both of the monitoring offsets, it may be assumed (or interpreted) that the CORESET-ID is the minimum CORESET-ID set by higher layer signaling. “Set by search space” may be read as “set by search space”, “set by search space”, or the like.

That is, in the first embodiment, “minimum CORESET-ID in the latest slot” may be replaced with “minimum CORESET-ID set in the latest slot”.

The UE may assume that the minimum CORESET-ID among all the set CORESETs is the “minimum CORESET-ID” regardless of whether DCI is detected in the CORESET (implementation) Form 1.1). Alternatively, the UE may assume the minimum CORESET-ID of the CORESETs from which DCI is detected as the “minimum CORESET-ID” (Embodiment 1.2). Note that “detection” may be read as “reception”.

For example, when the UE is set with two CORESETs, CORESET-ID # 0 and # 1, the “minimum CORESET-ID” is CORESET-ID # 0 in Embodiment 1.1.

On the other hand, the “minimum CORESET-ID” is CORESET-ID # 0 if the UE has detected DCI even once in the CORESET with CORESET-ID # 0 in the embodiment 1.2. Otherwise, if the DCI has been detected even once in the CORESET with the CORESET-ID # 1, it is the CORESET-ID # 1. Otherwise, the CORESET-ID # 0 or the CORESET-ID. It may be # 1, or it may be assumed that “does not exist”.

It should be noted that “CORESET-ID # 0” may indicate CORESET (may be called initial CORESET, default CORESET, etc.) set using MIB.

The “minimum CORESET-ID” in the first embodiment may be an ID corresponding to a CORESET that is not associated with a search space (just set) or excludes such an ID. ID may be sufficient.

According to the first embodiment described above, the UE can appropriately determine the “minimum CORESET-ID in the latest slot”.

<Second Embodiment>
In the second embodiment, the UE uses the minimum CORESET of the CORESETs to monitor the “minimum CORESET-ID in the latest slot” to be used when the above-described time offset is less than the predetermined threshold. -It may be assumed (or interpreted) as an ID. In the second embodiment, the “latest slot” may be determined based on one or both of the monitoring period and the monitoring offset set by the search space setting.

That is, in the second embodiment, “minimum CORESET-ID in the latest slot” is “minimum CORESET-ID to be monitored in the latest slot” and “CORESET-ID set in the latest slot. , “Minimum CORESET-ID to be monitored”.

The UE may assume that a monitoring period is set for each search space. The monitoring period may be set using an arbitrary time unit (for example, slot, subframe, symbol, millisecond, etc.).

The UE may assume the minimum CORESET-ID among all the set CORESETs as the “minimum CORESET-ID” regardless of whether or not DCI is detected in the CORESET (implementation) Form 2.1). Alternatively, the UE may assume the minimum CORESET-ID of the CORESETs from which DCI is detected as the “minimum CORESET-ID” (embodiment 2.2).

In Embodiment 2.2, the “latest slot” may be the “latest slot in which DCI is detected”. In the embodiment 2.2, “minimum CORESET-ID in the latest slot” is “minimum CORESET-ID in which the DCI is detected in the latest slot in which DCI is detected” and “latest CORESET-ID in which DCI is detected. Of the CORESET-ID set in the slot of “the minimum CORESET-ID in which the DCI is detected” or the like.

1A and 1B are diagrams illustrating an example of “minimum CORESET-ID in the latest slot” according to Embodiment 2.1. In this example, one slot is included in one subframe (= 1 ms), and CORESET (CORESET # 1) corresponding to CORESET-ID # 1 is set in association with the search space of monitoring period = 5 slots. -CORESET (CORESET # 2) corresponding to ID # 2 is set in association with a search space of monitoring cycle = 1 slot.

UE monitors CORESET # 1 in slots # 0 and # 5. The UE monitors CORESET # 2 in slots # 0 to # 9.

FIG. 1A corresponds to a case scheduled to receive PDSCH in slot # 8. When viewed from the slot of the PDSCH, CORESET # 1 and # 2 in slot # 8 correspond to the latest monitored CORESET. In this case, the UE may determine that the “minimum CORESET-ID in the latest slot” in the determination of the QCL (or TCI) regarding the PDSCH is CORESET-ID # 2.

The UE may make the above determination regardless of whether or not DCI is detected in CORESET # 2 in slot # 8. The DCI that schedules the PDSCH in slot # 8 may be detected in slot # 8 or may be detected in an earlier slot.

FIG. 1B corresponds to a case scheduled to receive PDSCH in slot # 5. When viewed from the slot of the PDSCH, CORESET # 1 in slot # 5 corresponds to the latest monitored CORESET. In this case, the UE may determine that the “minimum CORESET-ID in the latest slot” in the QCL (or TCI) determination regarding the PDSCH is CORESET-ID # 1.

The UE may make the above determination regardless of whether or not DCI is detected in CORESET # 1 in slot # 5. The DCI that schedules the PDSCH in slot # 5 may be detected in slot # 5 or may be detected in an earlier slot.

2A and 2B are diagrams illustrating an example of “minimum CORESET-ID in the latest slot” in the embodiment 2.2. In this example, the same CORESET and search space configuration as in FIGS. 1A and 1B is assumed.

In FIG. 2A, the UE detects DCI in CORESET # 1 in slot # 5 and detects DCI in CORESET # 2 in slots # 2, # 5, and # 6. In FIG. 2B, the UE detects DCI in CORESET # 1 in slot # 5 and detects DCI in CORESET # 2 in slots # 2 and # 5.

FIG. 2A corresponds to a case scheduled to receive PDSCH in slot # 8. When viewed from the slot of the PDSCH, CORESET # 2 in slot # 6 corresponds to the latest CORESET in which DCI is detected. In this case, the UE may determine that the “minimum CORESET-ID in the latest slot” in the determination of the QCL (or TCI) regarding the PDSCH is CORESET-ID # 2.

FIG. 2B also corresponds to a case scheduled to receive PDSCH in slot # 8. When viewed from the slot of the PDSCH, CORESET # 1 and # 2 in slot # 5 correspond to the latest CORESET in which DCI is detected. In this case, the UE may determine that the “minimum CORESET-ID in the latest slot” in the QCL (or TCI) determination regarding the PDSCH is CORESET-ID # 1.

In the example of FIG. 2B, if DCI is detected only in CORESET # 2 in slot # 5, the above “minimum CORESET-ID in the latest slot” is determined to be CORESET-ID # 2. Good.

According to the second embodiment described above, the UE can appropriately determine the “minimum CORESET-ID in the latest slot”.

<Modification>
Although the “latest slot” in the above-described embodiments (first and second embodiments) has been described assuming that it is the same slot (or includes the same slot) as the PDSCH, the present invention is not limited to this. For example, it may be assumed that the “latest slot” is not the same slot as PDSCH (or does not include the same slot). The latest slot that is not the same slot as the PDSCH may be assumed to be a slot that is at least a predetermined number of slots (for example, one slot) before the slot that receives the PDSCH.

The DCI used for the determination of the CORESET-ID in the embodiments 1.2 and 2.2 may be a DCI that satisfies at least one of the following:
(1) Arbitrary DCI,
(2) DCI transmitted in a specific search space (eg C-SS or UE-SS),
(3) DCI according to a specific DCI format (eg, DCI format 1_0 or 1_1).

According to (1), since the CORESET in which DCI is detected has at least a certain reception quality, the PDSCH QCL is judged based on the CORESET to determine the PDSCH decoding (reception) performance to some extent. It is expected to be secured. Further, according to (1), the QCL can be determined based on the latest channel environment as much as possible.

According to (2), since CORESET in which DCI transmitted by C-SS is detected can assume QCL with a typical signal and channel (for example, SS / PBCH block) in a certain serving cell, It is expected that the PDSCH decoding (reception) performance can be secured to some extent by determining the PDSCH QCL based on the PDSCH QCL.

Further, according to (2), the CORESET in which DCI transmitted by the UE-SS is detected is transmitted to the PDCCH transmitted to the UE (for example, transmitted using a beam optimal for the UE). Therefore, it is expected that the decoding (reception) performance of the PDSCH can be secured to some extent by determining the QCL of the PDSCH based on the CORESET.

According to (3), for example, CORESET in which DCI (DL assignment) for scheduling PDSCH is detected corresponds to PDCCH transmitted in the same manner as the PDSCH (for example, transmitted using the same beam). Since it is assumed, it is expected that the decoding (reception) performance of the PDSCH can be secured to some extent by determining the QCL of the PDSCH based on the CORESET.

The “minimum CORESET-ID” in the above embodiment may be determined from an ID excluding a specific CORESET-ID (eg, CORESET-ID # 0).

Also, the “minimum CORESET-ID” in the above embodiment may be read as “maximum CORESET-ID”, “CORESET-ID that satisfies a specific condition”, or the like.

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

FIG. 3 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. In the radio communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do.

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

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. It is equipped with. Moreover, the user terminal 20 is arrange | positioned at the macrocell C1 and each small cell C2. The arrangement, the number, and the like of each cell and 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 using CA or DC. Moreover, the user terminal 20 may apply CA or DC using a plurality of cells (CC).

Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (also referred to as an existing carrier or a legacy carrier). 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 radio base station 12, or The same carrier 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 using time division duplex (TDD) and / or frequency division duplex (FDD) in each cell. In each cell (carrier), a single neurology may be applied, or a plurality of different neurology may be applied.

Numerology may be a communication parameter applied to transmission and / or reception of a certain signal and / or channel, for example, subcarrier interval, bandwidth, symbol length, cyclic prefix length, subframe length. , TTI length, number of symbols per TTI, radio frame configuration, specific filtering process performed by the transceiver in the frequency domain, specific windowing process performed by the transceiver in the time domain, and the like. For example, for a certain physical channel, when the subcarrier intervals of the constituting OFDM symbols are different and / or when the number of OFDM symbols is different, it may be referred to as having different neumerities.

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

The radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30. The upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto. Each radio base station 12 may be connected to the higher 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. The radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point. Hereinafter, when the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.

Each user terminal 20 is a terminal that supports various communication schemes 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 radio communication system 1, as a radio access method, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink. Frequency Division Multiple Access) and / or OFDMA is applied.

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

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

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

Note that DCI for scheduling DL data reception may be referred to as DL assignment, and DCI for scheduling UL data transmission may be referred to as 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 the PUSCH. EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.

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

In the wireless communication system 1, as downlink reference signals, 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. 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 referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.

(Radio base station)
FIG. 4 is a diagram illustrating an example of an overall configuration of a radio base station according to an 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 path interface 106. Note that the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.

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

In the baseband signal processing unit 104, with respect to user data, PDCP (Packet Data Convergence Protocol) layer processing, user data division / combination, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access) Control) Retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing are performed and the transmission / reception unit 103. 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 to a radio frequency band and transmits the converted 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 transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present disclosure. In addition, the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.

On the other hand, for the upstream 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 converts the frequency of 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: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106. The call processor 105 performs communication channel call processing (setting, release, etc.), status management of the radio base station 10, radio resource management, and the like.

The transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface. The transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.

The transmission / reception unit 103 may further include an analog beam forming unit that performs analog beam forming. The analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. May be. Further, the transmission / reception antenna 101 may be constituted by, for example, an array antenna.

FIG. 5 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present disclosure. In addition, in this example, the functional block of the characteristic part in this embodiment is mainly shown, and it may be assumed that the wireless 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. These configurations may be included in the radio base station 10, and a part 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 configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present disclosure.

The control unit 301 controls, for example, signal generation in the transmission signal generation unit 302, signal allocation in the mapping unit 303, and the like. The control unit 301 also controls signal reception processing in the reception signal processing unit 304, signal measurement 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, resource Control). In addition, the control unit 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is necessary for the uplink data signal.

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

The control unit 301 includes 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.), a random access preamble (for example, by PRACH). (Sending signal), scheduling of uplink reference signals and the like are controlled.

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 performed. The control unit 301 may perform control to form a beam based on downlink propagation path information, uplink propagation path information, and the like. Such propagation path information may be acquired from the reception signal processing unit 304 and / or the measurement 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 it to the mapping unit 303. The transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generation unit 302 generates, for example, a DL assignment for notifying downlink data allocation information and / or a UL grant for notifying uplink data allocation information based on an instruction from the control unit 301. The DL assignment and UL grant are both DCI and follow the DCI format. In addition, the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel State Information) from each user terminal 20.

The mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103. The mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on 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 reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure.

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

The measurement unit 305 performs measurement on the received signal. The measurement unit 305 can be configured from a measurement device, a measurement circuit, or a measurement device described based on 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, and the like based on the received signal. The measurement unit 305 includes received power (for example, RSRP (Reference Signal Received Power)), received 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.

In addition, the transmission / reception unit 103 may transmit downlink control information (DCI) (DL assignment or the like) for scheduling a downlink shared channel (for example, PDSCH).

(User terminal)
FIG. 6 is a diagram illustrating an example of an overall configuration of a user terminal according to an 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. Note that the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.

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 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204. The transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present disclosure. The transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from 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. Also, broadcast information of downlink data may be transferred to the application unit 205.

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

Note that the transmission / reception unit 203 may further include an analog beam forming unit that performs analog beam forming. The analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. May be. Further, the transmission / reception antenna 201 may be constituted by, for example, an array antenna.

FIG. 7 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment. In addition, in this example, the functional block of the characteristic part in this embodiment is 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. Note 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 configured by a controller, a control circuit, or a control device described based on 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. The control unit 401 also controls signal reception processing in the reception signal processing unit 404, 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 uses 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 to form a transmission beam and / or a reception beam. May be performed. The control unit 401 may perform control to form a beam based on downlink propagation path information, uplink propagation path information, and the like. The propagation path information may be acquired from the reception signal processing unit 404 and / or the measurement unit 405.

In addition, when the control unit 401 obtains various types of information notified from the radio base station 10 from the reception signal processing unit 404, the control unit 401 may update 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 configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generation unit 402 generates an uplink control signal related to delivery confirmation information, channel state information (CSI), and the like based on an instruction from the control unit 401, for example. In addition, 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 UL grant is included in the downlink control signal notified from the radio base station 10.

The mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal to the transmission / reception unit 203. The mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on 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 reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure. Further, the reception signal processing unit 404 can constitute 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. In addition, the reception signal processing unit 404 outputs the reception signal and / or the signal after reception processing to the measurement unit 405.

The measurement unit 405 performs measurement on the received signal. For example, the measurement unit 405 may perform the same frequency measurement and / or the different frequency measurement for one or both of the first carrier and the second carrier. The measurement unit 405 may perform different frequency measurement on the second carrier based on the measurement instruction acquired from the reception signal processing unit 404 when the first carrier includes a serving cell. The measurement unit 405 can be configured from a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present disclosure.

For example, the measurement unit 405 may perform RRM measurement, CSI measurement, and the like based on the received signal. The measurement unit 405 may measure reception 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.

Note that the transmission / reception unit 203 may receive downlink control information (DCI) (DL assignment or the like) for a downlink shared channel (for example, PDSCH) schedule.

When the time offset between the DL assignment and the PDSCH reception scheduled by the DL assignment is smaller than a predetermined threshold (Threshold-Sched-Offset), the control unit 401 sets the minimum CORESET-ID in the latest slot. Based on the corresponding TCI state, the QCL related to the PDSCH (for example, the QCL of the DMRS for PDSCH) may be determined.

The control unit 401 sets the minimum CORESET-ID in the latest slot to higher layer signaling (for example, one or more “ControlResourceSet”, regardless of the monitoring period set by the search space setting (for example, one or more “SearchSpace” IE)). It may be determined that the CORESET-ID is the smallest of the CORESETs set by “IE).

The control unit 401 may determine that the minimum CORESET-ID in the latest slot is the minimum CORESET-ID monitored in the latest slot.

The control unit 401 may determine that the minimum CORESET-ID in the latest slot is the minimum CORESET-ID in which the arbitrary DCI is detected in the latest slot in which the arbitrary DCI is detected.

The control unit 401 sets the minimum CORESET-ID in the latest slot to the minimum CORESET in which the DCI transmitted in the specific search space is detected in the latest slot in which the DCI transmitted in the specific search space is detected. -It may be determined to be an ID.

The control unit 401 determines that the minimum CORESET-ID in the latest slot is the minimum CORESET-ID in which the DCI conforming to the specific DCI format is detected in the latest slot where the DCI conforming to the specific DCI format is detected. May be.

(Hardware configuration)
In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one device physically or logically coupled, or two or more devices physically or logically separated may be directly or indirectly (for example, (Using wired, wireless, etc.) and may be implemented using these multiple devices.

For example, a wireless base station, a user terminal, and the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 8 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment. The wireless 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 term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.

For example, although only one processor 1001 is illustrated, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

Each function in the radio base station 10 and the user terminal 20 is calculated by causing the processor 1001 to perform calculations by reading predetermined software (programs) on hardware such as the processor 1001 and the memory 1002, for example, via the communication device 1004. This is realized by controlling communication or controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

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

In addition, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes 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 embodiments 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 similarly for other functional blocks.

The memory 1002 is a computer-readable recording medium such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one. The memory 1002 may be called 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, and the like that can be executed to perform the wireless communication method according to an embodiment of the present disclosure.

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

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

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

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

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

(Modification)
Note that 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 meaning. For example, at least one of the channel and the symbol may be a signal (signaling). The signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard. Moreover, a component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, etc.

The radio frame may be configured by one or a plurality of periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe. Further, a subframe may be composed of one or more slots in the time domain. The subframe may have a fixed length of time (eg, 1 ms) that does not depend on numerology.

Here, the neurology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. For example, subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame configuration, transceiver in frequency domain It may indicate at least one of a specific filtering process to be performed and a specific windowing process to be performed by the transceiver in the time domain.

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

The slot may include a plurality of mini slots. Each minislot may be configured with one or more symbols in the time domain. The minislot may also be called a subslot. A mini-slot may be composed of fewer symbols than slots. PDSCH (or PUSCH) transmitted in units of time larger than a minislot may be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be referred to as a PDSCH (PUSCH) mapping type B.

Radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may have different names corresponding to each other, or may be read as one another.

For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot is called a TTI. May be. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. It may be. Note that a unit representing TTI may be called a slot, a minislot, or the like instead of a subframe.

Here, TTI means, for example, a minimum time unit for scheduling in wireless communication. For example, in the LTE system, a radio base station performs scheduling for assigning radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. 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, a time interval (for example, the number of symbols) in which a transport block, a code block, a code word, and the like are actually mapped may be shorter than the TTI.

When one slot or one minislot is referred to as a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum scheduling unit. Further, the number of slots (the 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 called 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, or the like. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.

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

A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain.

Also, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.

One or more RBs include physical resource blocks (PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. May be called.

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

Note that the structure of the above-described radio frame, subframe, slot, minislot, symbol, etc. is merely an example. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in the slot, the number of symbols and RBs included in the slot or minislot, and 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 variously changed.

Further, information, parameters, and the like described in the present disclosure may be expressed using absolute values, may be expressed using relative values from predetermined values, or may be expressed using other corresponding information. May be represented. For example, the radio resource may be indicated by a predetermined index.

The names used for parameters and the like in this disclosure are not limited names in any way. Further, mathematical formulas and the like that use these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so various names assigned to these various channels and information elements. Is not a restrictive name in any respect.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, commands, 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 May be represented by a combination of

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

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

The notification of information is not limited to the aspect / embodiment described in the present disclosure, and may be performed using other methods. For example, information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

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

In addition, notification of predetermined information (for example, notification of “being X”) is not limited to explicit notification, but implicitly (for example, by not performing notification of the predetermined information or other information) May be performed).

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

Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, code, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

Also, software, instructions, information, etc. may be transmitted / received via a transmission medium. For example, the software uses websites using 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 a transmission medium.

The terms “system” and “network” as used in this disclosure may be used interchangeably.

In the present disclosure, “base station (BS)”, “radio base station”, “fixed station”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “ "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", Terms such as “carrier”, “component carrier”, “BWP (Bandwidth Part)” may be used interchangeably. A base station may also be called terms such as a macro cell, a small cell, a femto cell, and a pico cell.

The base station can accommodate one or a plurality of (for example, three) cells (also called sectors). When the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH: Remote Radio Head)) can also provide communication services. The terms “cell” or “sector” refer to part or all of the coverage area of at least one of a base station and a base station subsystem that provides 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 station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal , Handset, user agent, mobile client, client or some other suitable term.

At least one of the base station and the mobile station may be referred to as a transmission device, a reception device, or the like. Note that 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 unattended moving body (for example, a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation.

Further, the radio base station in the present disclosure may be replaced with a user terminal. For example, communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc. may be called)) For each configuration, each aspect / embodiment of the present disclosure may be applied. In this case, the user terminal 20 may have a function that the wireless base station 10 has. 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, etc. may be read as a side channel.

Similarly, the user terminal in the present disclosure may be replaced with a radio base station. In this case, the wireless base station 10 may have a function that the user terminal 20 has.

In the present disclosure, the operation performed by the base station may be performed by the 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 may include a base station and one or more network nodes other than the base station (for example, It is obvious that this can be done by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited thereto) or a combination thereof.

Each aspect / embodiment described in the present disclosure may be used alone, may be used in combination, or may be switched according to execution. Further, the order of the processing procedures, sequences, flowcharts, and the like 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 this disclosure present elements of the various steps using an exemplary order and are not limited to the specific 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 trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802. 20, UWB (Ultra-WideBand), Bluetooth (registered trademark) The present invention may be applied to a system using other appropriate wireless communication methods, a next-generation system extended based on these, and the like. A plurality of systems may be combined and applied (for example, a combination of LTE or LTE-A and 5G).

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

Any reference to elements using designations such as “first”, “second”, etc. as used in this disclosure does not generally limit the amount or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some way.

The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determination (decision)” includes judgment, calculation, calculation, processing, derivation, investigating, looking up (eg, table, (Searching in a database or another data structure), ascertaining, etc. may be considered to be “determining”.

In addition, “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be "determining".

Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.

Also, “judgment (decision)” may be read as “assuming”, “expecting”, “considering”, and the like.

As used in this disclosure, the terms “connected”, “coupled”, or any variation thereof, is any direct or indirect connection or coupling between two or more elements. And may include the presence of one or more intermediate elements between two elements “connected” or “coupled” to each other. The coupling 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., as well as some non-limiting and non-inclusive examples, radio frequency domain, microwave It can be considered to be “connected” or “coupled” to each other using electromagnetic energy having a wavelength in the region, light (both visible and invisible) region, and the like.

In the present disclosure, the term “A and B are different” may mean “A and B are different from each other”. Terms such as “leave” and “coupled” may be interpreted in a similar manner.

In this disclosure, where “include”, “including” and variations thereof are used, these terms are inclusive, as are the terms “comprising”. Is intended. Further, the term “or” as used in this disclosure is not intended to be an exclusive OR.

In the present disclosure, for example, when articles are added by translation such as a, an, and the in English, the present disclosure may include plural nouns that follow these articles.

Although the invention according to the present disclosure has been described in detail above, it is obvious for 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 modifications and changes without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not give any restrictive meaning to the invention according to the present disclosure.

Claims (6)

1. A receiving unit that receives downlink control information (DCI) for scheduling of the downlink shared channel;
   When the time offset between reception of the DCI and the downlink shared channel is smaller than a predetermined threshold, the transmission configuration corresponding to the identifier (CORESET-ID) of the minimum control resource set (CORESET: Control REsource SET) in the latest slot And a control unit that determines pseudo-collocation related to the downlink shared channel based on an instruction (TCI: Transmission Configuration Indication) state.
2. The control unit determines that the minimum CORESET-ID in the latest slot is the minimum CORESET-ID among the CORESETs set by higher layer signaling regardless of the monitoring period set by the search space setting. The user terminal according to claim 1, wherein the user terminal is determined.
3. The user terminal according to claim 1, wherein the control unit determines that the minimum CORESET-ID in the latest slot is the minimum CORESET-ID monitored in the latest slot.
4. The control unit determines that the smallest CORESET-ID in the latest slot is the smallest CORESET-ID in which the arbitrary DCI is detected in the latest slot in which the arbitrary DCI is detected. The user terminal according to claim 1.
5. The control unit sets the minimum CORESET-ID in the latest slot to the minimum CORESET in which the DCI transmitted in the specific search space is detected in the latest slot in which the DCI transmitted in the specific search space is detected. The user terminal according to claim 1, wherein the user terminal is determined to be an ID.
6. The control unit determines that the minimum CORESET-ID in the latest slot is the minimum CORESET-ID in which the DCI conforming to the specific DCI format is detected in the latest slot where the DCI conforming to the specific DCI format is detected. The user terminal according to claim 1, wherein:
   

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