WO2020031335A1

WO2020031335A1 - User terminal

Info

Publication number: WO2020031335A1
Application number: PCT/JP2018/029946
Authority: WO
Inventors: 真哉岡村; 浩樹原田; 一樹武田; 祐輝松村
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2020-02-13

Abstract

A user terminal according to one aspect of the present disclosure is characterized by comprising: a reception unit which receives information indicating a transmission configuration instruction (TCI) state of a downlink shared channel; and a control unit which when at least one symbol assigned to the downlink shared channel in a slot overlaps a search space in which the downlink control channel is monitored, controls reception processing for at least one among the downlink shared channel and the downlink control channel in the slot.

Description

User terminal

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

In a UMTS (Universal Mobile Telecommunications System) network, long term evolution (LTE: Long Term Evolution) has been specified for the purpose of higher data rates and lower delays (Non-Patent Document 1). Also, 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).

Succession 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 Rel. 14 or 15 or later) are also being studied.

In an existing LTE system (for example, LTE@Rel.8-14), a user terminal (UE: User @ Equipment) transmits downlink control information (DCI) transmitted via a downlink control channel (for example, PDCCH: Physical @ Downlink @ Control @ Channel). : Downlink Control Information, also referred to as DL assignment and the like, and controls the reception of a downlink shared channel (for example, PDSCH: Physical Downlink Shared Channel). Further, the user terminal controls transmission of an uplink shared channel (for example, PUSCH: Physical Uplink Shared Channel) based on DCI (also referred to as UL grant or the like).

では In a future wireless communication system (hereinafter, NR), communication using beamforming (BF) is being studied. For this reason, based on the state (TCI state) of the transmission configuration instruction (TCI: Transmission Configuration Indication or Transmission Configuration Indicator) of the channel, the user terminal performs reception processing (for example, reception, demapping, demodulation, and decoding) of the channel. (At least one).

Here, the TCI state is information on pseudo collocation (QCL: Quasi-Co-Location) of a channel or a signal, and is also called a spatial reception parameter or the like. The TCI state is specified to the user terminal for each channel or signal. The user terminal determines at least one of a transmission beam (Tx beam) and a reception beam (Rx beam) of each channel based on the TCI state specified for each channel.

In the NR, at least one symbol assigned to a downlink shared channel (for example, PDSCH) in a slot overlaps with a search space in which a downlink control channel (for example, PDCCH) is monitored. collide)). In this case, how to control the reception processing of the downlink shared channel and the downlink control channel having the same or different TCI status in the slot becomes a problem.

Accordingly, it is an object of the present disclosure to provide a user terminal capable of appropriately controlling reception processing in a slot where at least one symbol assigned to a downlink shared channel overlaps a search space.

A user terminal according to an aspect of the present disclosure includes a receiving unit that receives information indicating a transmission configuration instruction (TCI) state of a downlink shared channel, and at least one symbol allocated to the downlink shared channel in a slot is assigned to the downlink control channel. When the channel overlaps with the monitored search space, the control unit controls a reception process for at least one of the downlink shared channel and the downlink control channel in the slot.

According to an aspect of the present disclosure, it is possible to appropriately control reception processing in a slot where at least one symbol assigned to the downlink shared channel overlaps with the search space.

1A and 1B are diagrams illustrating an example of PDSCH and PDCCH reception control in NR. 2A and 2B are diagrams illustrating an example of the operation of the user terminal in the case where the number of PDSCH symbols> the number of symbols in the search space. FIG. 3 is a diagram illustrating another example of the operation of the user terminal when the number of symbols of the PDSCH> the number of symbols of the search space. 4A and 4B are diagrams illustrating an example of the operation of the user terminal in the case where the number of PDSCH symbols <the number of search space symbols. FIG. 5 is a diagram illustrating another example of the operation of the user terminal in the case where the number of PDSCH symbols> the number of symbols in the search space. FIG. 6 is a diagram illustrating an example of the operation of the user terminal when at least a part of the frequency domain resources allocated to the PDSCH does not overlap with the search space. FIG. 7 is a diagram illustrating an example of the operation of the user terminal when at least a part of the frequency domain resources allocated to the PDSCH overlaps with the search space. 8A and 8B are diagrams illustrating an example of a Tx beam and an Rx beam according to the second embodiment. 9A and 9B are diagrams illustrating an example of an operation of the user terminal when at least one symbol assigned to the PDSCH according to the second example overlaps with a search space. FIG. 10 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment. FIG. 11 is a diagram showing an example of the entire configuration of the base station according to the present embodiment. FIG. 12 is a diagram illustrating an example of a functional configuration of the base station according to the present embodiment. FIG. 13 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. FIG. 14 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. FIG. 15 is a diagram illustrating an example of a hardware configuration of the base station and the user terminal according to the present embodiment.

(TCI state)
In NR, a user terminal performs a reception process (for example, reception, demapping, demodulation, and decoding) on a channel based on a state (TCI state) of a channel transmission configuration instruction (TCI: Transmission Configuration Indication or Transmission Configuration Indicator). (At least one).

Here, the TCI state is information on pseudo collocation (QCL: Quasi-Co-Location) of a channel or a signal, and is also called a spatial reception parameter, spatial information (spatial @ info), or the like. The TCI state is specified to the user terminal for each channel or signal. The user terminal may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of each channel based on the TCI state specified for each channel.

ＱHere, QCL is an index indicating the statistical property of at least one of a channel and a signal (channel / signal). For example, when a plurality of channels / signals have a QCL relationship, a Doppler shift (doppler shift), a Doppler spread (doppler spread), an average delay (average delay), a delay spread ( It may mean that it can be assumed that at least one of delay @ spread, spatial parameter (Spatial @ parameter) (e.g., spatial receiving parameter (Spatial @ Rx @ Parameter)) is the same (QCL for at least one of these).

Note that the spatial reception parameter (spatial QCL) may correspond to an Rx beam (for example, a received analog beam) of the user terminal, and the Rx beam may be specified based on the spatial reception parameter.

A plurality of types (QCL types) may be defined 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 are described below.
QCL type A: Doppler shift, Doppler spread, average delay and delay spread,
・ QCL type B: Doppler shift and Doppler spread,
QCL type C: Doppler shift and average delay,
QCL type D: spatial reception parameters.

Information on the QCL (QCL information, QCL-Info) as described above may be specified for each channel. The QCL information for each channel may include (or indicate) at least one of the following information:
Information indicating the QCL type (QCL type information);
Information on a reference signal (RS: Reference Signal) having a QCL relationship with each channel (RS information);
Information indicating a carrier (cell) where the RS is located;
Information indicating a bandwidth part (BWP: Bandwidth Part) in which the RS is located;
Information indicating a spatial reception parameter (for example, Rx beam) of each channel.

The channels for which the TCI state is specified include a downlink shared channel (PDSCH: Physical Downlink Shared Channel), a downlink control channel (PDCCH: Physical Downlink Control Channel), an uplink shared channel (PUSCH: Physical Uplink Shared Channel), and an uplink control channel. (PUCCH: Physical Uplink Control Channel).

The RS having the QCL relationship with the channel may be, for example, a synchronization signal block (SSB: Synchronization Signal Block) or a channel state information reference signal (CSI-RS: Channel Satate Information-Reference Signal). The SSB is a signal block including at least one of a primary synchronization signal (PSS: Primary Synchronization Signal), a secondary synchronization signal (SSS: Secondary Synchronization Signal), and a broadcast channel (PBCH: Physical Broadcast Channel).

<TCI status for PDCCH>
The TDC state for the PDCCH may specify information about the PDCCH (or the demodulation reference signal (DMRS) of the PDCCH) and the RS related to the QCL (for example, the resource of the RS). The DMRS may be paraphrased as an antenna port of the DMRS (DMRS port) or a group of the DMRS ports (DMRS port group).

In the user terminal, one or more TCI states may be configured (configured) by higher layer signaling for each control resource set (CORESET: Control Resource Set). Further, when one or more TCI states are set per CORESET, a single TCI state may be activated by MAC (Medium Access Control) signaling.

Here, the upper layer signaling may be, for example, any one of RRC (Radio Resource Control) signaling, broadcast information, and the like, or a combination thereof. The broadcast information may be, for example, a master information block (MIB: Master Information Block), a system information block (SIB: System Information Block), minimum system information (RMSI: Remaining Minimum System Information), or the like. The MAC signaling may use, for example, a MAC control element (MAC @ CE (Control @ Element)), MAC @ PDU (Protocol @ Data @ Unit), or the like.

$ CORESET may be associated with a search space that includes one or more PDCCH candidates (PDCCH $ candidates). One or more search spaces per coreset may be associated. The user terminal may monitor the search space and detect the PDCCH (DCI).

The PDCCH candidate is a resource unit to which one PDCCH is mapped, and may be configured by, for example, a number of control channel elements (CCE: Control Channel Element) according to an aggregation level. The search space may include a number of PDCCH candidates according to the aggregation level.

In the present disclosure, “CORESET”, “search space (or search space set)”, “PDCCH candidate (or set of one or more PDCCH candidates (PDCCH candidate set))”, “downlink control channel (for example, PDCCH)” "And" Downlink control information (DCI) "may be read each other. “Monitoring” may be read as “at least one of blind decoding and blind detection”.

For example, the user terminal may control the process of receiving the PDCCH based on a TCI state corresponding to (or activated for) the CORESET. Specifically, the user terminal may perform the PDCCH reception process on the assumption that the user terminal is transmitted using the same Tx beam as the RS specified by the TCI state. Further, the user terminal may determine a spatial reception parameter (Rx beam) of the PDCCH based on the TCI state.

<TCI status for PDSCH>
The TCI state for PDSCH may specify information (for example, resources of the RS) on the RS that has a QCL relationship with the PDSCH (or the DMRS of the PDSCH). The DMRS may be paraphrased as a DMRS port or a DMRS port group.

The user terminal may be notified (configured) of M (M ≧ 1) TCI states (QCL information for M PDSCHs) for PDSCH by higher layer signaling. At least some of the M TCI states may be activated by MAC signaling. The value of a predetermined field (eg, TCI field) in the DCI that schedules the PDSCH may indicate one of the configured (or activated) TCI states.

The user terminal may control the PDSCH reception process based on the TCI status indicated by the predetermined field value in DCI. Specifically, the user terminal may perform the PDSCH receiving process on the assumption that the user terminal is transmitted using the same Tx beam as the RS specified by the TCI state. Further, the user terminal may determine a spatial reception parameter (Rx beam) of the PDSCH based on the TCI state.

FIGS. 1A and 1B are diagrams showing an example of PDSCH and PDCCH reception control in NR. As shown in FIG. 1A, a transmission / reception point (TRP: Transmission \ Reception \ Point) may form a plurality of transmission beams (for example, Tx beams # 1 to # 4). TRP may be paraphrased as eNodeB (eNB), gNodeB (gNB), base station, radio base station, transmission point, or the like.

For example, the Tx beams # 1 to # 4 in FIG. 1 may be digital beams. Digital beam is a method of performing precoding signal processing (on a digital signal) on baseband. In this case, parallel processing of inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform) / digital-analog conversion (DAC: Digital to Analog Converter) / RF (Radio Frequency) is required only for the number of antenna ports (RF chains). Become. On the other hand, at an arbitrary timing, beams can be formed in a number corresponding to the number of RF @ chain.

Also, as shown in FIG. 1A, the user terminal may form a plurality of Rx beams (for example, Rx beams # 1 and # 2). A user terminal may be paraphrased as User @ Equipment (UE), a terminal, an apparatus, a device, or the like.

For example, the Rx beams # 1 and # 2 in FIG. 1 may be analog beams. Analog beam is a method using a phase shifter on RF. In this case, since only the phase of the RF signal is rotated, the configuration can be easily realized at low cost. On the other hand, there is a problem that a plurality of beams cannot be formed at the same timing.

FIG. 1B shows an example of PDCCH and PDSCH reception control using the pair of Tx beam and Rx beam (also referred to as a beam pair, beam pair link (BPL: Beam Pair Link), etc.) shown in FIG. 1A.

For example, in FIG. 1B, both the PDCCH and the PDSCH are transmitted with Tx beam # 2. On the other hand, PDCCH is received using Rx beam # 1, and PDSCH is received using Rx beam # 2. Thus, it is assumed that the Rx beam differs between the PDCCH and the PDSCH. Note that the Rx beam, the TCI state, the spatial reception parameter, and the QCL information may be paraphrased mutually.

On the other hand, as shown in FIG. 1B, a case is assumed where simultaneous reception (simultaneous RX) of PDCCH and PDSCH with different Rx beams is set. For example, in FIG. 1B, some of the time domain resources (eg, symbols) assigned to the PDSCH by DCI overlap the search space. As described above, the PDCCH is mapped to one of the PDCCH candidates in the search space, and is detected by monitoring the search space.

However, when the Rx beam # 1 and the Rx beam # 2 are analog beams, PDSCH and PDCCH reception processes using different Rx beams (TCI states) # 1 and # 2 cannot be performed at the same timing. .

Therefore, when at least one symbol assigned to the PDSCH in the slot overlaps (collides with) the search space, how to control the reception processing of the PDSCH and the PDCCH having different TCI states in the slot is problematic. Becomes Another problem is how to control the reception processing of PDSCH and PDCCH having the same TCI state in the slot.

Therefore, the present inventors studied a method of appropriately controlling at least one reception process of the PDSCH and the PDCCH in a slot where at least one symbol assigned to the PDSCH overlaps (collides) with the search space, and considers a method of the present invention. Reached.

Hereinafter, the present embodiment will be described in detail with reference to the drawings. In the present embodiment, for example, the TCI state of the PDSCH is indicated by a predetermined field value in the DCI, and the TCI state of the PDCCH is associated with the CORRESET in which the PDCCH is arranged. I can't.

In addition, in the present embodiment, at least one cycle of the search space and the coreset, the frequency domain resource, the number of symbols, and the like may be configured in the user terminal by higher layer signaling. Further, in the present embodiment, “reception processing” may include at least one of reception, demapping, demodulation, and decoding.

(First aspect)
In the first mode, it is assumed that the user terminal uses an analog beam. In the first aspect, when at least one symbol assigned to the PDSCH in the slot overlaps with the search space, the user terminal controls a reception process for at least one of the PDSCH and the PDCCH in the slot.

<When the TCI state for PDCCH and the TCI state for PDSCH are different>
When the TCI state of the PDSCH is different from the TCI state of the PDCCH, the user terminal determines which of the PDSCH or the PDCCH in the slot where at least one symbol assigned to the PDSCH overlaps with the search space based on at least one of the following parameters: It may be determined whether to perform the receiving process.
(1) Type of search space (search space set)
(2) Search space identifier (search space ID)
(3) CORESET type (type or use)
(4) CORESET ID (CORESET ID)
(5) Radio Network Temporary Identifier (RNTI) type (kind)
(6) Number of symbols allocated to PDSCH and search space (time length, period)

Hereinafter, the operation of the user terminal based on the above parameters (1) to (6) in the slot where at least one symbol assigned to the PDSCH overlaps with the search space will be described in detail. The following user operation may be applied to the entire slot, or may be applied to a symbol (duplicate symbol) in which the PDSCH and the search space in the slot overlap.

(1) Type of search space The search space may include at least one of the following types.
・ Search space common to one or more user terminals (common search space (CSS))
-User terminal specific search space (UE specific search space (USS)).

The CSS may also include at least one of the following types:
Type 0-PDCCH CSS,
・ Type 0A-PDCCH CSS,
-Type 1-PDCCH CSS,
-Type 2-PDCCH CSS,
-Type 3-PDCCH CSS.

{Type 0-PDCCH} CSS is also called SS for SIB1, SS for RMSI (Remaining Minimum System Informatio), and the like. Type 0-PDCCH @ CSS is a cyclic redundancy check (CRC: Cyclic Redundancy @ Check) scrambled by a predetermined identifier (for example, SI-RNTI: System @ Information-Radio Network * Temporary @ Identifier). It may be a shared space (a search space for monitoring a DCI for scheduling a Physical Downlink Shared Channel).

Here, the CRC scrambling is to add (include) a CRC bit scrambled (masked) with a predetermined identifier to DCI.

Type 0A-PDCCH CSS is also called SS for OSI (Other System Information). The type 0A-PDCCH @ CSS may be a search space for DCI that is scrambled with a predetermined identifier (for example, SI-RNTI) (a search space for monitoring DCI that schedules PDSCH for transmitting OSI).

{Type 1—PDCCH} CSS is also called SS for random access (RA). Type 1—PDCCH @ CSS is a DCI for DCI that is CRC-scrambled with a predetermined identifier (for example, RA-RNTI (Random @ Access-RNTI), TC-RNTI (Temporary @ Cell-RNTI) or C-RNTI (Cell-RNTI)). The search space may be a search space (a DCI monitoring search space for scheduling a PDSCH for transmitting a message for an RA procedure (for example, a random access response (message 2) and a collision resolution message (message 4)).

{Type 2—PDCCH} CSS is also referred to as paging SS, paging SS, and the like. Type 2-PDCCH @ CSS is a search space for CRC scramble DCI with a predetermined identifier (for example, P-RNTI: Paging-RNTI) (a search space for monitoring DCI that schedules PDSCH for transmitting paging). Good.

Type 3—PDCCH @ CSS is transmission of a predetermined identifier (eg, INT-RNTI (Interruption @ RNTI) for indicating DL preemption, SFI-RNTI (Slot @ Format @ Indicator @ RNTI) for indicating slot format), and PUSCH (Physical @ Uplink @ Shared @ Channel). TPC-PUSCH-RNTI for power control (TPC: Transmit Power Control), TPC-PUCCH-RNTI for TPC of PUCCH (Physical Uplink Control Channel), TPC-SRS-RNTI for TPC of SRS (Sounding Reference Signal), The search space for CRC scramble DCI may be C-RNTI, CS-RNTI (Configured @ Scheduling @ RNTI) or SP-CSI-RNTI (Semi-Persistent-CSI-RNTI).

Further, the USS may be a search space for DCI to which a CRC bit scrambled by a predetermined identifier (for example, C-RNTI, CS-RNTI or SP-CSI-RNTI) is added (included). .

When at least one symbol assigned to the PDSCH in the slot overlaps with the search space, the user terminal performs either reception processing of the PDSCH or reception processing of the PDCCH in the search space based on the type of the search space. (Which one has priority) may be determined.

Here, the process of receiving the PDCCH in the search space may be either the process of monitoring the search space or the process of receiving the PDCCH detected by monitoring the search space.

For example, when the type of the search space is CSS, the user terminal may ignore the PDSCH and perform the process of receiving the PDCCH in the CSS. On the other hand, when the type of the search space is USS, the user terminal may perform the PDSCH receiving process ignoring the PDCCH.

Here, “ignore PDSCH” may mean not receiving / decoding PDSCH or ignoring DCI for scheduling PDSCH. Further, “ignoring the PDCCH” may mean not monitoring the search space in which the PDCCH is arranged, or not performing the PDCCH reception process.

Also, when the type of the search space is a specific CSS (for example, the above-mentioned type 2-PDCCH @ CSS (paging SS)), the user terminal may ignore the PDSCH and perform the PDCCH reception processing in the CSS. Good. On the other hand, when the type of the search space is USS, the user terminal may perform the PDSCH receiving process ignoring the PDCCH.

ＥＴ ETWS (Earthquake and Tsunami Warning System) such as Earthquake Early Warning is placed in Type 2-PDCCH CSS (Paging SS) and triggered by DCI (Paging DCI) CRC scrambled by P-RNTI. The user terminal confirms the update of the system information based on the paging DCI. For this reason, when at least one symbol assigned to the PDSCH overlaps with the paging SS, reception of the paging SS can be prioritized, and user terminals scheduled for the same timing of the PDSCH can also receive an emergency earthquake bulletin.

Note that a set of one or more search spaces (for example, a search space for each aggregation level) may be referred to as a search space set. The determination based on the search space type may be replaced with a search space set type determination.

(2) Search space ID
A search space ID is assigned to the search space. For example, search space # 0 whose search space ID is “0” may be used as the type 0-PDCCH CSS.

Therefore, when at least one symbol assigned to the PDSCH overlaps with the search space, the user terminal determines whether to perform the PDSCH reception process or the PDCCH reception process in the search space based on the search space ID of the search space. (Which is given priority) may be determined.

For example, when the search space ID is a specific value (for example, 0), the user terminal may ignore the PDSCH and perform the PDCCH reception process in the search space. On the other hand, when the search space ID is a value other than the specific value, the user terminal may ignore the PDCCH and perform the PDSCH receiving process.

(3) CORESET Type CORESET may include one or more types (uses, types) of CORESET. For example, CORESET # 0 may be set based on an index in the MIB, and a DCI for scheduling SIB1 may be arranged.

For this reason, when at least one symbol assigned to the PDSCH overlaps with the search space, the user terminal performs the PDSCH reception processing and the search space based on the type (type, use) of the CORRESET associated with the search space. May be determined as to which of the PDCCH reception processes to perform (which has priority).

For example, when the RESET is a specific RESET (for example, RESET # 0), the user terminal may ignore the PDSCH and perform the PDCCH reception process in the search space associated with the RESET. On the other hand, if the coreset is not a specific coreset, the user terminal may ignore the PDCCH and perform the PDSCH receiving process.

(4) CORESET ID
CORESET is given a CORESET ID. For example, the above-mentioned CORRESET # 0 is provided with a reset ID “0”.

For this reason, when at least one symbol assigned to the PDSCH overlaps with the search space, the user terminal performs the reception processing of the PDSCH and the reception of the PDCCH in the search space based on the coreset ID of the coreset associated with the search space. Which of the processes to perform (which has priority) may be determined.

{For example, when the CORSET @ ID is a specific value (for example, 0), the user terminal may ignore the PDSCH and perform the PDCCH reception process in the search space associated with the CORRESET. On the other hand, if the CORSET @ ID is a value other than the specific value, the user terminal may ignore the PDCCH and perform the PDSCH receiving process.

(5) RNTI type As described above, the RNTI includes SI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, and TPC-PUCCH-RNTI. , TPC-SRS-RNTI, C-RNTI, CS-RNTI, SP-CSI-RNTI and so on.

Therefore, when at least one symbol assigned to the PDSCH overlaps with the search space, the user terminal receives the PDSCH based on the type of RNTI in which the monitored DCI of the search space is CRC-scrambled. It may be determined which of the processing and the PDCCH reception processing in the search space is to be performed (which one has priority).

For example, when the RNTI is a specific RNTI (for example, P-RNTI, SI-RNTI, RA-RNTI, or the like), the user terminal may ignore the PDSCH and perform the PDCCH reception process in the search space. Good. On the other hand, if the CORSET @ ID is a value other than the specific value, the user terminal may ignore the PDCCH and perform the PDSCH receiving process.

(6) Number of Symbols Allocated to PDSCH and Search Space On the other hand, if at least one symbol allocated to the PDSCH in the slot overlaps with the search space, the user terminal determines that the symbol allocated to the PDSCH and the search space overlaps (overlapping symbol). Whether to perform the reception processing of the PDCCH or the PDSCH in the symbol) may be determined based on the PDSCH and the number of symbols in the search space.

Specifically, when the number of PDSCH symbols in the slot is larger than the number of symbols in the search space, the user terminal may perform PDCCH reception processing ignoring PDSCH in the duplicated symbols. On the other hand, when the number of symbols of the PDSCH in the slot is smaller than the number of symbols of the search space, the user terminal may ignore the PDCCH and perform the PDSCH receiving process on the duplicated symbol.

(6-1) Case where the number of PDSCH symbols <the number of symbols in the search space FIGS. 2A and 2B are diagrams illustrating an example of the operation of the user terminal in the case where the number of PDSCH symbols> the number of symbols in the search space. 2A and 2B, as described in FIG. 1B, at least one symbol allocated to the PDSCH overlaps with the search space. In the following, description will be made focusing on differences from FIG. 1B.

As shown in FIG. 2A, in the same slot, when the number of symbols allocated to the PDSCH is larger than the number of symbols in the search space, the user terminal performs PDCCH reception processing on symbols overlapping the PDSCH and the search space. Is also good.

In FIG. 2A, the user terminal may perform PDSCH reception processing on a symbol (non-overlapping symbol) in which the allocation of the PDSCH and the search space do not overlap, assuming that the PDSCH is punctured by the overlapping symbol. .

2B, similarly to FIG. 2A, the user terminal may perform the PDCCH reception process on the duplicated symbol. On the other hand, in FIG. 2B, the user terminal may perform PDSCH reception processing on the non-overlapping symbol, assuming that PDSCH is rate-matched on the non-overlapping symbol instead of puncturing the PDSCH with the overlapping symbol. Good.

In FIGS. 2A and 2B, the user terminal may perform the receiving process of either the PDSCH or the PDCCH and ignore the other in the slot where the PDSCH and the search space are assigned in the same slot. In this case, which of the PDSCH and the PDSCH reception processing is to be performed can be determined using at least one of the above parameters (1) to (5).

FIG. 3 is a diagram illustrating another example of the operation of the user terminal in the case where the number of PDSCH symbols> the number of symbols in the search space. In FIG. 3, a PDCCH detected by monitoring the search space in a symbol overlapping the search space with the PDSCH in a certain slot is received / decoded.

As shown in FIG. 3, at least one predetermined number of symbols before and after the search space among the non-overlapping symbols may be used as an Rx beam switching period. The user terminal may ignore the PDSCH in the predetermined number of symbols. Further, when there is a remaining non-overlapping symbol assigned to the PDSCH in the certain slot, the user terminal may perform the PDSCH receiving process with the remaining non-overlapping symbol.

The predetermined number of symbols for the Rx beam switching period may be determined in advance in specifications or may depend on the implementation of the user terminal. For example, in FIG. 3, an Rx beam switching period is provided for every two symbols before and after the search space, but the present invention is not limited to this.

(6-2) Number of symbols of PDSCH <number of symbols of search space FIGS. 4A and 4B are diagrams illustrating an example of the operation of the user terminal in the case where the number of symbols of PDSCH <the number of symbols of search space. 4A and 4B differ from FIGS. 2A and 2B in that the number of PDSCH symbols is smaller than the number of symbols in the search space. In the following, description will be made focusing on differences from FIGS. 2A and 2B.

ＡAs shown in FIG. 4A, when the number of symbols allocated to the PDSCH in the same slot is smaller than the number of symbols in the search space, the user terminal may perform the PDSCH receiving process on the overlapping symbols.

4A, the user terminal may perform the PDCCH reception process in the search space in the non-overlapping symbol, assuming that the PDCCH is punctured by the overlapping symbol.

4B, similarly to FIG. 4A, the user terminal may perform the PDSCH receiving process on the duplicated symbol. On the other hand, in FIG. 4B, the user terminal may perform the PDCCH reception processing on the non-overlapping symbol on the assumption that the PDCCH is rate-matched on the non-overlapping symbol instead of puncturing the PDCCH on the overlapping symbol. Good.

4A and 4B, the user terminal may perform one of the PDSCH and PDCCH reception processes in a slot where the PDSCH and search space allocations overlap, and ignore the other. In this case, whether to receive (ignore) the PDSCH or the PDSCH can be determined using at least one of the above parameters (1) to (5).

FIG. 5 is a diagram showing another example of the operation of the user terminal when the number of PDSCH symbols> the number of search space symbols. In FIG. 5, the PDSCH receiving process is performed on the symbols overlapping the PDSCH and the search space in the slot.

As shown in FIG. 5, at least one predetermined number of symbols before and after the symbol allocated to the PDSCH among the non-overlapping symbols may be used as an Rx beam switching period. The user terminal may ignore the PDCCH in the predetermined number of symbols. Further, when there is a remaining non-overlapping symbol to be allocated to the search space in the slot, the user terminal may perform a PDCCH reception process using the remaining non-overlapping symbol.

The predetermined number of symbols for the Rx beam switching period may be determined in advance in specifications or may depend on the implementation of the user terminal. For example, in FIG. 5, it is assumed that the Rx beam switching period is provided two symbols before and after the PDSCH allocation symbol, but the present invention is not limited to this.

In FIG. 5, the user terminal cannot receive / decode the PDCCH because there is no remaining non-overlapping symbol allocated to the search space in the certain slot.

Therefore, the user terminal may control the Rx beam switching period based on the number of symbols allocated to the search space in the certain slot. For example, in the case shown in FIG. 5, by shortening or eliminating the switching period of the Rx beam, the user terminal may perform the PDCCH reception process using the non-overlapping symbol allocated to the search space.

<When the TDC state for PDCCH is the same as the TCI state for PDSCH>
When the TCI state of the PDSCH is the same as the TCI state of the PDCCH, the user terminal may control at least one reception process of the PDSCH and the PDCCH in a slot where at least one symbol assigned to the PDSCH overlaps with the search space. Good.

≫When frequency domain resources do not overlap≫
When at least part of the frequency domain resources allocated to the PDSCH does not overlap with the search space, the user terminal may perform reception processing of both the PDSCH and the PDCCH in the search space in the slot (including the overlapping symbol). .

The frequency domain resource may be, for example, a physical resource block (PRB: Physical Resource Block) (resource block), a resource block group including one or more PRBs (RBG: Resource Resource Block Group), or one or more subcarriers. Good.

ユーザ In addition, the user terminal may determine (select) a channel or a search space in which reception processing is preferentially performed in the slot (including the duplicate symbol) based on a predetermined criterion. For example, the predetermined criterion is a bandwidth (the number of PRBs or the number of RBGs) allocated to at least one of the PDSCH and the search space, a channel estimation number, a subcarrier interval (SCS: Subcarrier Spacing), a search space type or ID, It may be at least one of a coreset type or ID and an aggregation level.

FIG. 6 is a diagram illustrating an example of the operation of the user terminal when at least a part of the frequency domain resources allocated to the PDSCH does not overlap with the search space. Although FIG. 6 illustrates an example in which the number of symbols of the PDSCH is larger than the number of symbols of the search space, the present invention is not limited to this.

As shown in FIG. 6, when at least one symbol assigned to the PDSCH overlaps with the search space, but at least a part of the frequency domain resources assigned to the PDSCH does not overlap with the search space, the user terminal performs the same TCI state. Based on the (spatial reception parameter), reception processing of both PDSCH and PDCCH may be performed. For example, in FIG. 6, the user terminal may perform the receiving process of the PDSCH and the PDCCH with the symbol overlapping the PDSCH and the search space, and may perform the receiving process of the PDSCH with the non-overlapping symbol.

In addition, in FIG. 6, the user terminal may determine (select) a channel or a search space in which reception processing is preferentially performed in the slot (including overlapping symbols) based on a predetermined priority.

The predetermined priority may be set to one of the following, for example, when the number of estimated channels is 20:
CSS PDCCH> USS PDCCH> PDSCH,
PDSCH> PDCCH of CSS> PDCCH of USS.

The predetermined priority may be determined based on the aggregation level. For example, if the aggregation level is greater than (greater than or equal to) a predetermined value, priority may be given to PDSCH reception processing, and if the aggregation level is equal to or less than (less than) a predetermined value, priority may be given to PDCCH reception processing. Alternatively, the opposite control may be performed.

≫When frequency domain resources overlap≫
When at least a part of the frequency domain resource allocated to the PDSCH overlaps with the search space, the user terminal performs the reception process of one of the PDSCH and the PDCCH in the search space in the frequency domain resource where the PDSCH and the search space overlap. May go.

In this case, whether to perform the PDSCH or PDSCH reception processing in the overlapping frequency domain resources may be determined using at least one of the parameters (1) to (6), or May be determined according to the priority order.

FIG. 7 is a diagram illustrating an example of an operation of the user terminal when at least a part of the frequency domain resources allocated to the PDSCH overlaps with the search space. Although FIG. 7 illustrates an example in which the number of PDSCH symbols is larger than the number of symbols in the search space, the present invention is not limited to this.

As shown in FIG. 7, when at least one symbol assigned to the PDSCH overlaps with the search space and at least a part of the frequency domain resources assigned to the PDSCH overlap with the search space, the user terminal performs , Based on the same TCI state (spatial reception parameter), at least one reception process of PDSCH and PDCCH may be performed.

For example, in FIG. 7, the user terminal may perform reception processing of either the PDSCH or the PDCCH in the overlapping frequency domain resources among the overlapping symbols of the PDSCH and the search space, and may ignore the other. On the other hand, in the non-overlapping frequency domain resources of the overlapping symbols, the reception processing of the channel (here, PDCCH) allocated to the non-overlapping frequency domain resources may be performed.

In FIG. 7, in the non-overlapping symbols of the PDSCH and the search space, the user terminal may or may not perform the PDSCH reception processing.

As shown in FIG. 7, when the frequency domain resources of the PDSCH and the search space overlap in the overlapping symbol, the user terminal operation in the overlapping frequency domain resources may be complicated. Therefore, the base station may allocate frequency domain resources to the PDSCH such that the search space and the frequency domain resources of the PDSCH do not overlap (for example, as shown in FIG. 6) in the duplicated symbols.

{Also, the base station may control the mapping of the PDCCH to the PDCCH candidate composed of the frequency domain resources that do not overlap with the PDSCH in the overlapping symbol according to a predetermined priority. Specifically, the predetermined priority may be determined based on at least one of the above parameters (1) to (6).

For example, the base station may map at least one of CSS and USS to a PDCCH candidate configured with a frequency domain resource that does not collide with PDSCH, or may map only a specific CSS.

As described above, in the first example, in a case where the user terminal uses an analog beam and at least one symbol assigned to the PDSCH in the slot overlaps with the search space, the user terminal transmits the PDSCH and the PDCCH in the slot. At least one of the receiving processes can be appropriately controlled.

(Second aspect)
In the second aspect, it is assumed that the user terminal supports a digital beam or a multi-panel.

FIGS. 8A and 8B are diagrams illustrating an example of a Tx beam and an Rx beam according to the second embodiment. FIG. 8A is different from FIG. 1A in that Rx beams # 1 and # 2 of the user terminal are digital beams. If the user terminal supports digital beams, multiple Rx beams can be formed at the same timing.

FIG. 8B shows an example of a multi-panel. In multi-panel transmission, a plurality of Rx beams can be formed at the same timing.

In the second aspect, the user terminal determines the PDSCH and the search space in the duplicate symbol based on the capability information (UE @ capability) of the user terminal regardless of whether the TDC state for the PDCCH is different from the TCI state for the PDSCH. May control at least one PDCCH reception process.

{Specifically, the user terminal may notify the base station of capability information indicating whether or not the user terminal has the capability to perform the reception processing of the PDCCH and the PDSCH in different TCI states at the same timing. If the user terminal has the capability, the user terminal may control at least one reception process of the PDSCH in the duplicate symbol and the PDCCH in the search space regardless of whether the TCI state for the PDCCH and the TCI state for the PDSCH are different. Good.

On the other hand, if the user terminal does not have the capability, the user terminal determines whether or not the TSCH state for the PDCCH and the TCI state for the PDSCH are different from each other in the PDSCH and the search space in the duplicate symbol, as in the first aspect. At least one reception process of the PDCCH may be controlled.

FIGS. 9A and 9B are diagrams showing an example of the operation of the user terminal when at least one symbol assigned to the PDSCH according to the second example overlaps with the search space. 9A and 9B illustrate an example in which the number of symbols of the PDSCH is larger than the number of symbols of the search space, but the present invention is not limited to this.

FIG. 9A shows a case where at least a part of the frequency domain resources allocated to the PDSCH does not overlap with the search space. On the other hand, FIG. 9B shows a case where at least a part of the frequency domain resources allocated to the PDSCH overlaps with the search space.

As described in the first example (for example, FIGS. 6 and 7), when the Rx beam of the user terminal is an analog beam, the TDC state of the PDCCH (Rx beam, spatial reception parameter) and the TCI state of the PDSCH (Rx beam , Spatial reception parameters), it is possible to receive / decode both the PDSCH in the duplicated symbol and the PDCCH in the search space.

On the other hand, when the user terminal supports digital beam or multi-panel, as shown in FIGS. 9A and 9B, the TDC state of the PDCCH (Rx beam, spatial reception parameter) and the TCI state of the PDSCH (Rx beam, spatial reception parameter) Are different, it is possible to receive / decode both the PDSCH in the duplicated symbol and the PDCCH in the search space as in the case where the TDC state of the PDCCH and the TCI state of the PDSCH are the same.

In the case illustrated in FIG. 9A, the user terminal determines whether the TCI state for the PDCCH and the TCI state for the PDSCH of the first mode are different regardless of whether the TCI state for the PDCCH is different from the TCI state for the PDSCH. In the case where they are the same>, the same control as in the case where {frequency domain resources do not overlap} (for example, FIG. 6) can be performed.

Also, in the case shown in FIG. 9B, the user terminal determines whether the <PDCCH TCI state and the PDSCH TCI state of the first aspect are <PDCCH TCI state and PDSCH TCI state, regardless of whether the PDCCH TCI state and the PDSCH TCI state are different. The same control can be performed as in the case of “the case where they are the same” {the case where the frequency domain resources overlap} (for example, FIG. 7).

When the base station receives the capability information indicating that it has the capability to perform the reception processing of the PDCCH and the PDSCH in different TCI states at the same timing, as illustrated in FIG. 9A, the overlapping symbol does not overlap with the search space. In this way, frequency domain resources for PDSCH may be allocated. This can prevent the user terminal operation in the frequency domain resource where the search space overlaps with the PDSCH in FIG. 9B from becoming complicated.

As described above, in the second example, when the user terminal uses a digital beam or a multi-panel and at least one symbol assigned to the PDSCH in the slot overlaps with the search space, the user terminal uses the PDSCH in the slot. And reception processing for at least one of the PDCCHs.

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

FIG. 10 is a diagram showing an example of a schematic configuration of the wireless communication system according to the present embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a unit of a system bandwidth (for example, 20 MHz) of an LTE system 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), and 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system for realizing these.

The wireless communication system 1 includes a base station 11 forming a macro cell C1 having relatively wide coverage, and a base station 12 (12a to 12c) arranged in the macro cell C1 and forming a small cell C2 smaller than the macro cell C1. Have. Further, user terminals 20 are arranged in the macro cell C1 and each small cell C2. The arrangement, number, and the like of each cell and the user terminals 20 are not limited to the modes shown in the figure.

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

Communication between the user terminal 20 and the 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, between the user terminal 20 and the base station 12, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, or the like) and a wide bandwidth may be used, or between the user terminal 20 and the base station 11. The same carrier as described above may be used. Note that the configuration of the frequency band used by each base station is not limited to this.

The user terminal 20 can perform communication using time division duplex (TDD: Time Division Duplex) and / or frequency division duplex (FDD: Frequency Division Duplex) in each cell. In each cell (carrier), a single numerology may be applied, or a plurality of different numerologies 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 processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, and the like. For example, for a certain physical channel, if the subcarrier intervals of the constituent OFDM symbols are different and / or if the number of OFDM symbols is different, the numerology may be referred to as different.

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

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

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

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

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

OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), and data is mapped to each subcarrier for communication. SC-FDMA divides a system bandwidth into bands each composed of one or a continuous resource block for each terminal, and a single carrier transmission that reduces interference between terminals by using different bands for a plurality of 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, as a downlink channel, a downlink shared channel (PDSCH: Physical Downlink Shared Channel), a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel and the like shared by each user terminal 20 are used. Used. The PDSCH transmits user data, upper layer control information, SIB (System @ Information @ Block), and the like. Also, MIB (Master \ Information \ Block) is transmitted by PBCH.

Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced 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 scheduling information of PDSCH and / or PUSCH is transmitted by PDCCH.

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

PCFICH transmits the number of OFDM symbols used for PDCCH. The PHICH transmits HARQ (Hybrid Automatic Repeat Repeat request) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) for the PUSCH. The EPDCCH is frequency-division multiplexed with a PDSCH (Downlink Shared Data Channel) and used for transmission of DCI and the like like the PDCCH.

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

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, a position determination reference signal (PRS: Positioning Reference Signal), and the like are transmitted. In the wireless communication system 1, a reference signal for measurement (SRS: Sounding Reference Signal), a reference signal for demodulation (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 transmitted reference signal is not limited to these.

<Base station>
FIG. 11 is a diagram showing an example of the entire configuration of the base station according to the present embodiment. The base station 10 includes a plurality of transmitting / receiving antennas 101, an amplifier unit 102, a transmitting / receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmitting / receiving antenna 101, the amplifier unit 102, and the transmitting / receiving unit 103 may be configured to include at least one each.

ユーザ User data transmitted from the 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, regarding user data, processing of a PDCP (Packet Data Convergence Protocol) layer, division / combination of user data, transmission processing of an RLC layer such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access) Control) Transmission / reception control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, etc., and transmission / reception processing are performed. 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 section 103 converts the baseband signal pre-coded and output from the baseband signal processing section 104 for each antenna into a radio frequency band, and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmitting / receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting / receiving antenna 101. The 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. Note that the transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.

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

The baseband signal processing unit 104 performs fast Fourier transform (FFT: Fast Fourier Transform), inverse discrete Fourier transform (IDFT), and error correction on user data included in the input uplink signal. Decoding, reception processing of MAC retransmission control, reception processing of the RLC layer and PDCP layer are performed, and the data is transferred to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, etc.) of a communication channel, state management of the base station 10, management of radio resources, and the like.

(4) The transmission path interface 106 transmits and receives signals to and from the higher-level station device 30 via a predetermined interface. The transmission line interface 106 transmits and receives signals (backhaul signaling) to and from another base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). Is also good.

Note that the transmitting and receiving unit 103 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit includes 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. May be. Further, the transmitting / receiving antenna 101 may be constituted by, for example, an array antenna.

FIG. 12 is a diagram showing an example of a functional configuration of the base station according to the present embodiment. In this example, functional blocks of characteristic portions in the present embodiment are mainly shown, and it may be assumed that 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. Note that these configurations need only be included in base station 10, and some or all of the configurations need not be included in baseband signal processing section 104.

The control unit (scheduler) 301 controls the entire base station 10. The control unit 301 can be configured from 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 assignment in the mapping unit 303, and the like. Further, the control unit 301 controls a signal reception process in the reception signal processing unit 304, a signal measurement in the measurement unit 305, and the like.

The control unit 301 performs scheduling (for example, resource transmission) of system information, a downlink data signal (for example, a signal transmitted on the PDSCH), and a downlink control signal (for example, a signal transmitted on the PDCCH and / or the EPDCCH; acknowledgment information and the like). Allocation). Further, control section 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 required for an uplink data signal.

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

The control unit 301 includes an uplink data signal (for example, a signal transmitted on the PUSCH), an uplink control signal (for example, a signal transmitted on the PUCCH and / or PUSCH, acknowledgment information, etc.), a random access preamble (for example, a PRACH). (Transmission signal), scheduling of uplink reference signals and the like.

The control unit 301 controls to form a transmission beam and / or a reception beam using digital BF (for example, precoding) in the baseband signal processing unit 104 and / or analog BF (for example, phase rotation) in the transmission / reception unit 103. 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. These propagation path information may be acquired from the reception signal processing unit 304 and / or the measurement unit 305.

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

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

Mapping section 303 maps the downlink signal generated by transmission signal generation section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs the result to transmission / reception section 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.

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

(4) 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 control section 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 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, or the like based on the received signal. Measuring section 305 receives 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)), channel information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 301.

The transmitting / receiving section 103 may transmit a downlink shared channel (for example, PDSCH) and a downlink control channel (for example, PDCCH) (downlink control information).

Further, the transmission / reception unit 103 is applied to information on at least one TCI state of the downlink shared channel and the downlink control channel (for example, configuration (configuration) information of the TCI state, information indicating the TCI state to be activated, PDCCH or PDSCH). Or at least one of the information indicating the TCI state of the TCI.

Also, when at least one symbol allocated to the downlink shared channel in a slot overlaps with a search space in which the downlink control channel is monitored, the control unit 301 allocates a frequency domain resource to the downlink shared channel in the overlapping symbol. May be controlled. For example, as illustrated in FIG. 6 or 9A, the control unit 301 may allocate a frequency domain resource that does not overlap with the search space to the downlink shared channel.

<User terminal>
FIG. 13 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. The user terminal 20 includes a plurality of transmitting / receiving antennas 201, an amplifier unit 202, a transmitting / receiving unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transmitting / receiving antenna 201, the amplifier unit 202, and the transmitting / receiving unit 203 may be configured to include at least one each.

(4) The radio frequency signal received by the transmitting / receiving 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 transmitting / receiving section 203 converts the frequency of the received signal into a baseband signal and outputs the baseband signal to the baseband signal processing section 204. The transmission / reception unit 203 can be configured from 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. Note that the transmission / reception unit 203 may be configured as an integrated 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, reception processing for retransmission control, 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, of the downlink data, broadcast information 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 processor 204 performs retransmission control transmission processing (eg, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like, and performs transmission / reception processing. Transferred to 203.

(4) 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 radio frequency band. The radio frequency signal frequency-converted by the transmitting / receiving section 203 is amplified by the amplifier section 202 and transmitted from the transmitting / receiving antenna 201.

Note that the transmission / reception unit 203 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit includes 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. May be. Further, the transmitting / receiving antenna 201 may be constituted by, for example, an array antenna.

FIG. 14 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment. Note that, in this example, functional blocks of characteristic portions 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 of 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 need only be included in the user terminal 20, and some or all of the configurations need 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 from 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 assignment in the mapping unit 403, and the like. Further, the control unit 401 controls a signal reception process in the reception signal processing unit 404, a 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 base station 10 from the reception signal processing unit 404. The control unit 401 controls generation of an uplink control signal and / or an uplink data signal based on a result of determining whether or not retransmission control is required for a downlink control signal and / or a downlink data signal.

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

When the control unit 401 acquires various information notified from the base station 10 from the reception signal processing unit 404, the control unit 401 may update parameters used for control based on the information.

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

(4) The transmission signal generation unit 402 generates an uplink control signal related to acknowledgment information, channel state information (CSI), and the like based on an instruction from the control unit 401, for example. Further, transmission signal generating section 402 generates an uplink data signal based on an instruction from control section 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 base station 10 includes a UL grant.

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

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

(4) 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 measures the received signal. For example, the measurement unit 405 may perform the same frequency measurement and / or the different frequency measurement on one or both of the first carrier and the second carrier. When the serving cell is included in the first carrier, measurement section 405 may perform different frequency measurement on the second carrier based on the measurement instruction acquired from received signal processing section 404. 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), and channel information (for example, CSI). The measurement result may be output to the control unit 401.

The transmitting / receiving section 203 may receive a downlink shared channel (for example, PDSCH) and a downlink control channel (for example, PDCCH) (downlink control information).

The transmission / reception unit 203 is applied to information on at least one TCI state of the downlink shared channel and the downlink control channel (for example, configuration (configuration) information of the TCI state, information indicating the TCI state to be activated, PDCCH or PDSCH). Or at least one of the information indicating the TCI state of the TCI.

When at least one symbol assigned to the downlink shared channel in a slot overlaps with a search space in which the downlink control channel is monitored, at least one of the downlink shared channel and the downlink control channel in the slot. You may control the receiving process about one.

When the TCI status of the downlink shared channel is different from the TCI status of the downlink control channel, the control unit 401 determines a type and an identifier of the search space, a type and an identifier of a control resource set associated with the search space, and a radio network temporary identifier. (RNTI), at least one of the downlink shared channel and the downlink control channel in the slot or in a symbol in which the downlink shared channel and the downlink control channel overlap in the slot. May be determined (first mode).

When the TCI state of the downlink shared channel is different from the TCI state of the downlink control channel, the control unit 401 determines whether the TCI state of the downlink shared channel is in the slot or in the slot based on the number of symbols of the downlink shared channel and the number of symbols of the search space. It may be determined whether to perform reception processing of the downlink shared channel or the downlink control channel in a symbol where the downlink shared channel and the downlink control channel overlap (FIGS. 2A, 2B, 4A, and 4B).

If the TCI state of the downlink shared channel is different from the TCI state of the downlink control channel, the control unit 401 may control the Rx beam switching period (FIGS. 3 and 5).

The control unit 401, when the TCI state of the downlink shared channel is the same as the TCI state of the downlink control channel, and when the frequency domain resources allocated to the downlink shared channel do not overlap with the search space, the downlink shared channel and the Reception processing may be performed on both the downlink shared channel and the downlink control channel in symbols where downlink control channels overlap (FIG. 6).

When the frequency domain resource allocated to the downlink shared channel does not overlap with the search space, the control unit 401 regardless of whether the TCI state of the downlink shared channel is the same as the TCI state of the downlink control channel, In a symbol in which the downlink shared channel and the downlink control channel overlap, reception processing may be performed on both the downlink shared channel and the downlink control channel (FIG. 9A).

The control unit 401, according to a priority determined based on at least one of the subcarrier interval, the number of estimated channels, the number of resource block groups, the type of search space, and the aggregation level, The receiving process of the downlink control channel may be controlled.

The control unit 401 determines that the TCI state of the downlink shared channel is the same as the TCI state of the downlink control channel, and that at least one symbol assigned to the downlink shared channel in a slot is a search space in which the downlink control channel is monitored. If they overlap, the reception process of either the downlink shared channel or the downlink control channel in the frequency domain resource where the downlink shared channel and the search space overlap may be controlled (FIG. 7).

When at least one symbol allocated to the downlink shared channel in a slot overlaps with a search space in which the downlink control channel is monitored, the control unit 401 sets the TCI state of the downlink shared channel to the TCI state of the downlink control channel. Regardless of whether they are the same or not, the reception processing of either the downlink shared channel or the downlink control channel in a frequency domain resource where the downlink shared channel and the search space overlap may be controlled (see FIG. 9B).

The control unit 401 may control the reception process of the downlink shared channel by ignoring the downlink control channel in the overlapping frequency domain resources (FIGS. 7 and 9B). The control unit 401 may control reception processing of the downlink control channel in at least one of frequency domain resources and symbols in which the downlink shared channel and the search space do not overlap.

The control unit 401 may control the reception process of the downlink control channel by ignoring the downlink shared channel in the overlapping frequency domain resources (FIGS. 7 and 9B). The control unit 401 may control reception processing of the downlink shared channel in at least one of frequency domain resources and symbols in which the downlink shared channel and the search space do not overlap.

The control unit 401 may stop the reception processing of the downlink shared channel in at least one of frequency domain resources and symbols in which the downlink shared channel and the search space do not overlap.

<Hardware configuration>
Note that the block diagram used in the description of the above embodiment shows a block of a functional unit. These functional blocks (configuration units) are realized by an arbitrary combination of at least one of hardware and software. In addition, a method of implementing each functional block is not particularly limited. That is, each functional block may be realized using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated). , Wired, wireless, etc.), and may be implemented using these multiple devices.

For example, the base station, the user terminal, and the like according to the present embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method according to the present disclosure. FIG. 15 is a diagram illustrating an example of a hardware configuration of the base station and the user terminal according to the present embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices illustrated in the drawing, or may be configured to exclude some of the devices.

For example, although only one processor 1001 is illustrated, there may be multiple processors. Further, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or by using another method. Note that the processor 1001 may be implemented by one or more chips.

The functions of the base station 10 and the user terminal 20 are performed, for example, by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002 so that the processor 1001 performs an arithmetic operation and communicates via the communication device 1004. And 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: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the above-described baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001.

The processor 1001 reads out 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 operation described in the above embodiment is used. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and other functional blocks may be implemented similarly.

The memory 1002 is a computer-readable recording medium, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), and other appropriate storage media. It may be constituted 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 implement the wireless communication method according to the present embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc) ROM, etc.), a digital versatile disc, At least one of a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (eg, a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. May be configured. The storage 1003 may be called 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, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). May be configured. 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 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, and the like) that receives an external input. The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, and the like). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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.

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

(Modification)
Note that terms described in the present disclosure and 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). 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, a pilot signal, or the like according to an applied standard. A component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, or the like.

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

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

The slot may be configured by 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 numerology.

Slots may include multiple mini-slots. Each minislot may be constituted by one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. A minislot may be made up of a smaller number of symbols than slots. A PDSCH (or PUSCH) transmitted in time units larger than minislots 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 frames, subframes, slots, minislots, and symbols 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. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be interchanged with each other.

For example, one subframe may be called a transmission time interval (TTI: Transmission @ Time @ Interval), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot is called a TTI. You may. 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 to 13 symbols), or a period longer than 1 ms. It may be. Note that the unit representing the TTI may be called a slot, a minislot, or the like instead of a subframe.

Here, the TTI refers to, for example, a minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) to each user terminal in TTI units. Note that 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 and link adaptation. Note that when a TTI is given, a time section (for example, the number of symbols) in which a transport block, a code block, a codeword, and the like are actually mapped may be shorter than the TTI.

If one slot or one minislot is called a TTI, one or more TTIs (ie, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (mini-slot number) 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. A TTI shorter than the normal TTI may be called 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 (for example, a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (for example, a shortened TTI, etc.) may be replaced with a TTI shorter than the long TTI and 1 ms The TTI having the above-described TTI length may be replaced with the TTI.

A resource block (RB: Resource Block) 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. The number of subcarriers included in the RB may be the same irrespective of the numerology, and may be, for example, 12. The number of subcarriers included in the RB may be determined based on numerology.

Ｒ Also, the RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, and the like may each be configured by one or a plurality of resource blocks.

Note that one or more RBs include a physical resource block (PRB: Physical @ RB), a subcarrier 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.

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

A bandwidth part (BWP: Bandwidth @ Part) (which may be referred to as a partial bandwidth or the like) may also represent a subset of consecutive common RBs (common @ resource @ blocks) for a certain numerology in a certain carrier. Good. Here, the common RB may be specified by an index of the RB based on the common reference point of the carrier. A PRB may be defined by a BWP and numbered within the BWP.

$ BWP may include a BWP for UL (UL @ BWP) and a BWP for DL (DL @ BWP). For a UE, one or more BWPs may be configured in one carrier.

少なくとも At least one of the configured BWPs may be active, and the UE may not have to assume transmitting and receiving a given channel / signal outside the active BWP. Note that “cell”, “carrier”, and the like in the present disclosure may be replaced with “BWP”.

The structures of the above-described radio frame, subframe, slot, minislot, symbol, and the like are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, included in an RB The configuration of the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic @ Prefix) length, and the like can be variously changed.

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

名称 Names used for parameters and the like in the present disclosure are not limited in any respect. Further, the formulas and the like using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so the various names assigned to these various channels and information elements Is not a limiting name in any way.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., that can be referred to throughout the above description are not limited to voltages, currents, electromagnetic waves, magnetic or magnetic particles, optical or photons, or any of these. May be represented by a combination of

情報 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, etc. may be input / output via a plurality of network nodes.

(4) Information and signals input and output may be stored in a specific place (for example, a memory) or may be managed using a management table. Information and signals that are input and output can be overwritten, updated, or added. The output information, signal, and the like may be deleted. The input information, signal, and the like may be transmitted to another device.

Notification of information is not limited to the aspect / embodiment described in the present disclosure, and may be performed using another method. For example, the information is notified by physical layer signaling (for example, downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, It may be implemented by broadcast information (master information block (MIB: Master Information Block), system information block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

Note that the physical layer signaling may be called 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. Also, the MAC signaling may be notified using, for example, a MAC control element (MAC @ CE (Control @ Element)).

Further, the notification of the predetermined information (for example, the notification of “X”) is not limited to an explicit notification, and is implicit (for example, by not performing the notification of the predetermined information or by another information). May be performed).

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

Software, regardless of whether it is called software, firmware, middleware, microcode, a hardware description language, or any other name, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

ソフトウェア Also, software, instructions, information, and the like may be transmitted and received via a transmission medium. For example, if 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.), the website, When transmitted from a server or other remote source, at least one of these wired and / or wireless technologies is included within the definition of a transmission medium.

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

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

In the present disclosure, “base station (BS: Base @ Station)”, “wireless base station”, “fixed station (fixed @ station)”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “gNodeB (gNB)” "Access point (access @ point)", "transmission point (TP: Transmission @ Point)", "reception point (RP: Reception @ Point)", "transmission / reception point (TRP: Transmission / Reception @ Point)", "panel", "cell" , "Sector", "cell group", "carrier", "component carrier" and the like may be used interchangeably. A base station may also be referred to as a macro cell, a small cell, a femto cell, a pico cell, or the like.

A base station can accommodate one or more (eg, three) cells. If 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: 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 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. .

A mobile station is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal. , Handset, user agent, mobile client, client or some other suitable terminology.

少なくとも At least one of the base station and the mobile station may be called a transmitting device, a receiving 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 unit, the mobile unit itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, or the like), may be an unmanned moving object (for example, a drone, an autonomous vehicle), or may be a robot (maned 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.

基地 Also, the base station in the present disclosure may be replaced with a user terminal. For example, communication between a base station and a user terminal is replaced with 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 configuration may be such that the user terminal 20 has the function of the base station 10 described above. Further, 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 replaced with a side channel.

Similarly, a user terminal in the present disclosure may be replaced by a base station. In this case, a configuration in which the base station 10 has the function of the user terminal 20 described above may be adopted.

In the present disclosure, the operation performed by the base station may be performed by an upper node (upper node) in some cases. In a network including one or more network nodes having a base station (network @ nodes), various operations performed for communication with a terminal include a base station, one or more network nodes other than the base station (eg, Obviously, it can be performed by MME (Mobility Management Entity), S-GW (Serving-Gateway) or the like, but not limited thereto, or a combination thereof.

各 Each aspect / embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching with execution. In addition, the order of the processing procedure, sequence, flowchart, and the like of each aspect / embodiment described in the present disclosure may be changed as long as there is no inconsistency. For example, for the methods described in this disclosure, elements of various steps are presented in an exemplary order, and are not limited to the specific order presented.

Each aspect / embodiment described in the present disclosure is applicable to 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, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802. 20, UWB (Ultra-WideBand), Bluetooth (registered trademark) , A system using other appropriate wireless communication methods, and a next-generation system extended based on these methods. Further, a plurality of systems may be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

記載 The term “based on” as used in the present disclosure does not mean “based on” unless otherwise indicated. In other words, the phrase "based on" means both "based only on" and "based at least on."

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

用語 The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "judgment (decision)" means judgment (judging), calculation (computing), processing (processing), deriving (deriving), investing (investigating), searching (looking up) (for example, a table, Searching in a database or another data structure), ascertaining, etc., may be regarded as "deciding".

Also, “determining” includes receiving (eg, receiving information), transmitting (eg, transmitting information), input (input), output (output), and access ( accessing) (e.g., accessing data in a memory) or the like.

Also, “judgment (decision)” is regarded as “judgment (decision)” of resolving, selecting, selecting, establishing, comparing, and the like. Is also good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of any operation.

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

The “maximum transmission power” described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal maximum transmission power (the nominal UE maximum transmit power), or may refer to the rated maximum transmission power (the rated UE maximum transmit power).

As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements. And may include the presence of one or more intermediate elements between two elements "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 this disclosure, where two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, the 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) regions, and the like.

において In the present disclosure, the term “A and B are different” may mean that “A and B are different from each other”. The term may mean that “A and B are different from C”. Terms such as "separate", "coupled" and the like may be interpreted similarly to "different".

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

において In the present disclosure, where articles are added by translation, for example, a, an, and the in English, the present disclosure may include that the nouns following these articles are plural.

Although the invention according to the present disclosure has been described in detail above, it is obvious 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 embodied 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 intended for illustrative purposes and does not bring any restrictive meaning to the invention according to the present disclosure.

Claims

A receiving unit that receives information indicating a transmission configuration instruction (TCI) state of the downlink shared channel;
Receiving at least one of the downlink shared channel and the downlink control channel in the slot if at least one symbol assigned to the downlink shared channel in a slot overlaps a search space in which the downlink control channel is monitored. A control unit for controlling processing;
A user terminal comprising:
The control unit, when the TCI state of the downlink shared channel is different from the TCI state of the downlink control channel, a type and an identifier of the search space, a type and an identifier of a control resource set associated with the search space, a radio network temporary identifier (RNTI), at least one of the downlink shared channel and the downlink control channel in the slot or in a symbol in which the downlink shared channel and the downlink control channel overlap in the slot. The user terminal according to claim 1, wherein it is determined whether or not to perform.
The control unit, when the TCI state of the downlink shared channel is different from the TCI state of the downlink control channel, based on the number of symbols of the downlink shared channel and the number of symbols of the search space, in the slot or in the slot The symbol according to claim 1 or 2, wherein it is determined whether to perform reception processing of the downlink shared channel or the downlink control channel in a symbol where the downlink shared channel and the downlink control channel overlap. User terminal.
The control unit, when the TCI state of the downlink shared channel is the same as the TCI state of the downlink control channel, and when the frequency domain resources allocated to the downlink shared channel do not overlap with the search space, the downlink shared channel and the 4. The user terminal according to claim 1, wherein reception processing is performed on both the downlink shared channel and the downlink control channel in a symbol in which a downlink control channel overlaps. 5.
When the control unit does not overlap the frequency space resources and the search space allocated to the downlink shared channel, regardless of whether the TCI state of the downlink shared channel is the same as the TCI state of the downlink control channel, The user terminal according to claim 1, wherein reception processing is performed on both the downlink shared channel and the downlink control channel in a symbol where the downlink shared channel and the downlink control channel overlap.
The control unit, the subcarrier interval, the number of estimated channels, the number of resource block groups, the type of search space, according to the priority determined based on at least one of the aggregation level, the downlink shared channel in the overlapping symbols, The user terminal according to claim 4, wherein the user terminal controls reception processing of the downlink control channel.