WO2019193666A1

WO2019193666A1 - User terminal and wireless base station

Info

Publication number: WO2019193666A1
Application number: PCT/JP2018/014365
Authority: WO
Inventors: 一樹武田; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-04-04
Filing date: 2018-04-04
Publication date: 2019-10-10

Abstract

One embodiment of this user terminal comprises: a reception unit that receives downlink control information (DCI); and a control unit that, when information that indicates whether the DCI for at least one control resource set that is within a prescribed bandwidth includes a transmission configuration indication (TCI) field is validated, assumes that the DCI that is transmitted by all control resource sets that are within the prescribed bandwidth includes the TCI field.

Description

User terminal and radio base station

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

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rates and low delay (Non-patent Document 1).

Also, LTE-A (also referred to as LTE Advanced, LTE Rel. 10, 11 or 12) has been specified for the purpose of further widening and speeding up from LTE (also referred to as LTE Rel. 8 or 9), and LTE. Successor systems (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Rel. 13, 14 or (Also referred to as after 15).

In an existing LTE system (for example, LTE Rel. 8-13), a user terminal (UE: User Equipment) is based on downlink control information (DCI: Downlink Control Information, also called DL assignment) from a radio base station. Then, reception of a downlink shared channel (for example, PDSCH: Physical Downlink Shared Channel) is controlled. 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).

In future wireless communication systems (for example, NR, 5G, 5G +, or Rel. 15 or later), it is considered to perform communication using beam forming (BF). In order to improve communication quality using BF, at least one of signal transmission and reception is controlled in consideration of a pseudo-co-location (QCL) relationship (QCL relationship) between a plurality of signals. It is being considered.

Specifically, the user terminal transmits a QCL relationship (a TCI state (a TCI field)) indicated by a value of a predetermined field in the DCI (for example, a field for transmission configuration indication (TCI: Transmission Configuration Indicator or Transmission Configuration Indicator)). Control of reception of a downlink shared channel (for example, PDSCH) scheduled by the DCI based on the TCI state (also referred to as a TCI state). In addition, it is considered that information (for example, tci-PresentInDCI) indicating whether a TCI field exists in the DCI is notified to the user terminal.

However, whether or not the predetermined field exists in the DCI for each control resource set (CORESET: Control Resource Set) set in a predetermined bandwidth (for example, a bandwidth part (BWP: Bandwidth Part)) ( When information indicating present or absent (for example, tci-PresentInDCI) is notified, the processing load for DCI detection (blind decoding) in the user terminal may increase.

The present invention has been made in view of such a point, and even when it is controlled whether or not a predetermined field (for example, a TCI field) is present in DCI, the processing load related to detection of the DCI is reduced. An object is to provide a possible user terminal and a radio base station.

A user terminal according to an aspect of the present invention includes: a receiving unit that receives downlink control information (DCI); and the DCI sets a field for a transmission configuration instruction (TCI) for at least one control resource set within a predetermined bandwidth. And a control unit that controls reception of the DCI in all control resource sets within the predetermined bandwidth based on information indicating whether or not the information is included.

According to one aspect of the present invention, even when it is controlled whether or not a predetermined field (for example, a TCI field) exists in DCI, the processing load related to detection of the DCI can be reduced.

FIG. 1 is a diagram illustrating an example of DCI transmitted by PDCCH of each CORESET. FIG. 2 is a diagram showing an example of DCI transmitted by each CORESET PDCCH according to the first mode. FIG. 3 is a diagram illustrating an example of a TCI field value according to the first aspect. It is a figure which shows an example of schematic structure of the radio | wireless communications system which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the wireless base station which concerns on this Embodiment. It is a figure which shows an example of a function structure of the radio base station which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of a function structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of the hardware constitutions of the radio base station and user terminal which concern on this Embodiment.

(QCL for PDSCH)
In a future wireless communication system (for example, Rel. 15 to 5G, 5G +, NR, etc.), the user terminal performs information (QCL: Quasi-Co-Location) on the downlink shared channel (for example, PDSCH) Control of reception processing (for example, at least one of demapping, demodulation, and decoding) of the downlink shared channel is under consideration based on (information).

Here, pseudo-collocation (QCL) is an index indicating the statistical properties of the channel. For example, when one signal and another signal have a QCL relationship, a Doppler shift, a Doppler spread, an average delay, and a delay spread (delay) are set between these different signals. spread) and a spatial parameter (for example, a spatial reception parameter (Spatial Rx Parameter)) can be assumed to be the same.

QCL may be provided with one or more types (QCL types) having different parameters that can be assumed to be the same. For example, four QCL types A to D having different parameters that can be assumed to be the same may be provided.

QCL type A: QCL that can be assumed to have the same Doppler shift, Doppler spread, average delay and delay spread
QCL type B: QCL that can be assumed to have the same Doppler shift and Doppler spread
QCL type C: QCL that can be assumed to have the same average delay and Doppler shift
QCL type D: QCL that can be assumed to have the same spatial reception parameters

The state of the transmission configuration instruction (TCI: Transmission Configuration Indication or Transmission Configuration Indicator) (TCI state (TCI-state)) may indicate information related to QSCH of PDSCH (also referred to as QCL information or QCL information for PDSCH). (May be included).

The PDCL QCL information is, for example, information related to the QCL between the PDSCH (DMRS port for the PDSCH) and a downlink reference signal (DL-RS: Downlink Reference Signal). Information (DL-RS related information) and information indicating the QCL type (QCL type information) may be included.

Here, the DMRS port is an antenna port for a demodulation reference signal (DMRS). The DMRS port may be a DMRS port group including a plurality of DMRS ports, and the DMRS port in this specification may be read as a DMRS port group.

The DL-RS related information may include at least one of information indicating a DL-RS having a QCL relationship and information indicating a resource of the DL-RS. For example, when a plurality of reference signal sets (RS sets) are set in the user terminal, the DL-RS related information includes the PDSCH (or the DMRS port for PDSCH) and the QCL among the reference signals included in the RS set. A predetermined DL-RS to be related and a resource for the DL-RS may be indicated.

Here, the DL-RS is a synchronization signal (SS: Synchronization Signal), a broadcast channel (PBCH: Physical Broadcast Channel), a synchronization signal block (SSB: Synchronization Signal Block), a mobility reference signal (MRS: Mobility RS), and a channel state. Information reference signal (CSI-RS: Channel Satate Information-Reference Signal), demodulation reference signal (DMRS: DeModulation Reference Signal), beam specific signal, etc., or these are expanded and / or modified. (For example, a signal configured by changing the density and / or the period).

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

As described above, each TCI state can indicate (can include) QCL information for PDSCH. To the user terminal, M (M ≧ 1) TCI states (Q pieces of QCL information for M PDSCHs) are notified (configured) from the radio base station by higher layer signaling (for example, RRC signaling). May be. The number M of TCI states set in the user terminal may be limited by at least one of the user terminal capability (UE capability) and the QCL type.

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

The TCI field may be configured with a predetermined number of bits (for example, 3 bits). Whether or not the TCI field is included in the DCI may be controlled by information notified from the radio base station to the user terminal. The information may be information (tci-PresentInDCI) indicating whether the TCI field is present in DCI (present or absent), or may be set in the user terminal by higher layer signaling.

For example, “tci-PresentInDCI is enabled” means that predetermined upper layer control information (for example, an information item “ControlResourceSet” for setting at least one of a time resource and a frequency resource of CORESET) is tci− PresentInDCI may be included. On the other hand, if the tci-PresentInDCI is disabled or not enabled, the higher layer control information may not include the tci-PresentInDCI.

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

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

When more than 8 types of TCI states are set in the user terminal, 8 or less types of TCI states may be activated (designated) by a MAC control element (MAC CE: Medium Access Control Control Element). The value of the TCI field in DCI may indicate one of the TCI states activated by the MAC CE.

The user terminal determines the QCL of the PDSCH (or the DMRS port of the PDSCH) based on the TCI state indicated by the TCI field value in the DCI. For example, the user terminal assumes that the DMRS port (or DMRS port group) of the PDSCH of the serving cell is a DL-RS and a QCL corresponding to the TCI state notified by DCI (for example, decoding) Processing and / or demodulation processing, etc.). Thereby, the reception precision of PDSCH can be improved.

(CORESET)
For each bandwidth part (BWP: Bandwidth Part) set by the user terminal in the serving cell, a predetermined number (for example, 3 or less) of control resource sets (CORESET: Control Resource Set) may be given to the user terminal.

Here, the BWP is a partial band set in a carrier (also referred to as a cell, a serving cell, a component carrier (CC)), and is also referred to as a partial band. The BWP may include a BWP for uplink (UL) (UL BWP, uplink BWP) and a BWP for downlink (DL: Downlink) (DL BWP, downlink BWP). Each BWP provided with the predetermined number of CORESETs may be a DL BWP.

CORESET is a resource region to which a downlink control channel (PDCCH: Physical Downlink Control Channel) can be allocated, and may include a predetermined frequency domain resource and a time domain resource (for example, 1 or 2 OFDM symbols). One or more search spaces may be provided in the CORESET. Here, the provision of a search space in CORESET indicates that control is performed based on the CORESET when setting a resource area for the search space.

The user terminal detects DCI for the user terminal by monitoring (blind decoding) the DCI transmitted via the PDCCH in the CORESET (or the search space in the CORESET).

For example, the following parameters may be given to the user terminal by higher layer signaling for CORESET # p (for example, 0 ≦ p <3) set in each DL BWP. That is, the following parameters may be notified (set) to the user terminal for each CORESET.
-Information indicating the CORESET index (for example, CORESET-ID)
Information indicating an initialization value of a scrambling sequence of a demodulation reference signal (DMRS) of PDCCH (for example, PDCCH-DMRS-Scrambling-ID)
・ Consecutive number of symbols constituting CORESET (for example, CORESET-time-duration)
Information (for example, CORESET-freq-dom) indicating a predetermined number of resource blocks (physical resource block (PRB)) constituting the CORESET
Information indicating a mapping type (for example, interleaved or non-interleaved) from a control channel element (CCE) to a resource element group (REG) in CORESET (for example, CORESET-CCE-to-REG) -mapping-type)
Information indicating the size of the group (REG bundle) including the predetermined number of REGs (number of REGs in the REG bundle) (for example, CORESET-REG-bundle-size)
Information indicating a cyclic shift (CS: Cyclic Shift, CS amount or CS index) for the interleaver of the REG bundle (for example, CORESET-shift-index)
・ QCL information of DMRS antenna port for PDCCH reception (also called antenna port pseudo-collocation etc.)
Indication of presence / absence (presence or absence) of TCI field in DCI (for example, DCI format 1_0 or DCI format 1_1) transmitted by PDCCH in CORESET # p (for example, TCI-PresentInDCI)

As described above, for each CORESET of each DL BWP, information (for example, tci-PresentInDCI) indicating whether the TCI field is present (present) or not present (absent) is set in the user terminal. In this case, the processing load for DCI detection (blind decoding) at the user terminal may increase.

FIG. 1 is a diagram illustrating an example of DCI transmitted by each CORESET PDCCH. FIG. 1 shows the case where two CORESET # 0 and # 1 are set in the user terminal in DL BWP, but the number of CORESETs set in the user terminal is not limited to two, but one or three or more It may be.

In FIG. 1, the DCI format 1_1 is shown as an example of the DCI, but is not limited thereto. In FIG. 1, tci-PresentInDCI is validated for CORESET # 0 and tci-PresentInDCI is invalidated for CORESET # 1, but this is only an example and is not limited thereto.

For example, as shown in FIG. 1, when tci-PresentInDCI is enabled for CORESET # 0, DCI format 1_1 transmitted by PDCCH in CORESET # 0 includes a TCI field. On the other hand, when tci-PresentInDCI is not validated for CORESET # 1, DCI format 1_1 transmitted by PDCCH in CORESET # 0 does not include a TCI field.

As a result, in FIG. 1, the size of the same DCI format 1_1 may be different between CORESET # 0 and # 1 set in the user terminal. For example, in the case of a 3-bit TCI field, the size of DCI format 1_1 of CORESET # 0 may be 3 bits larger than the size of DCI format 1_1 of CORESET # 1.

In the future wireless communication system, in order to suppress the processing load for blind decoding in the user terminal, the DCI monitored by the user terminal in one slot is a predetermined type (for example, four types or five types). Etc.) is assumed to be limited to the size (number of bits). Also, DCI to which a cyclic redundancy check (CRC) that is scrambled (masked) by a user-specific identifier (for example, C-RNTI: Cell-Radio Network Temporary Identifier) is added is a predetermined type per slot. It is assumed that the size is limited to (for example, three types or four types).

On the other hand, as shown in FIG. 1, when different sizes are assumed for each CORESET for the same DCI format, the processing load for DCI detection (blind decoding) in the user terminal may increase.

Therefore, the present inventors, based on information (for example, tci-PresentInDCI) indicating whether or not a TCI field exists in DCI for at least one CORESET in DL BWP, all CORESETs in the DL BWP. Inspired to control the reception of DCI in

Hereinafter, the present embodiment will be described in detail with reference to the drawings. In the following, a single downlink BWP is assumed as the predetermined bandwidth, but the present invention is not limited to this. The present embodiment may be applied to DCI reception control in CORESET set in one or more DL BWPs, for example. In the following, it is assumed that information indicating whether DCI includes a TCI field is “tci-PresentInDCI”, but the name of the information is not limited to this.

(First aspect)
In the first aspect, the user terminal enables tci-PresentInDCI (information indicating whether DCI includes a TCI field) for at least one CORESET within a predetermined bandwidth (for example, DL BWP). Suppose that the DCI transmitted in all CORESET within the predetermined bandwidth includes a TCI field. The DCI transmitted by all CORESET within the predetermined bandwidth may be, for example, the DCI format 1_1.

Specifically, the user terminal may control the reception of the PDSCH scheduled by the DCI based on the TCI field value in the DCI transmitted in the CORESET in which tci-PresentInDCI is enabled.

In addition, the TCI field value in the DCI transmitted in the CORESET in which tci-PresentInDCI is not validated may be a predetermined value (for example, “0” or “1”).

Also, the user terminal may receive tci-PresentInDCI for each CORESET in which tci-PresentInDCI is validated. For CORESET in which tci-PresentInDCI is not validated (invalidated), tci-PresentInDCI may not be received. Further, the user terminal may receive tci-PresentInDCI by higher layer signaling.

Here, the upper layer signaling may be, for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof. The broadcast information is, for example, at least one of a master information block (MIB: Master Information Block), a system information block (SIB: System Information Block), an RMSI (Remaining Minimum System Information), and an OSI (Other System Information). Also good.

FIG. 2 is a diagram illustrating an example of DCI transmitted by each CORESET PDCCH according to the first mode. In FIG. 2, the difference from FIG. 1 will be mainly described.

In FIG. 2, tci-PresentInDCI is validated for at least one CORESET (here, CORESET # 0) set in DL BWP. For this reason, the user terminal assumes that DCI transmitted in all CORESET (here, CORESET # 0 and # 1) set in the DL BWP includes a TCI field.

Specifically, as shown in FIG. 2, when tci-PresentInDCI is enabled for CORESET # 0, DCI format 1_1 transmitted by PDCCH in CORESET # 0 may include a TCI field.

Also, tci-PresentInDCI is not activated for CORESET # 1, but tci-PresentInDCI of CORESET # 0 is validated, so that DCI format 1_1 transmitted by PDCCH in CORESET # 1 includes a TCI field. Good.

As described above, in FIG. 2, when tci-PresentInDCI is enabled for at least one CORESET (here, CORESET # 0) set in the DL BWP, not only the DCI transmitted by the CORESET # 0. , DCI transmitted in CORESET # 1 in which tci-PresentInDCI is not validated also includes a TCI field. For this reason, since the size of the same DCI format becomes equal between CORESET in DL BWP, the processing load of the detection of the said DCI format in a user terminal can be reduced.

FIG. 3 is a diagram illustrating an example of a TCI field value according to the first aspect. As shown in FIG. 3, DCI transmitted in CORESET (for example, CORESET # 0 in FIG. 2) in which tci-PresentInDCI is validated is a TCI field value indicating the above-mentioned TCI state (QCL information for PDSCH). May be included.

On the other hand, the TCI field value of DCI transmitted in CORESET (for example, CORESET # 1 in FIG. 2) in which tci-PresentInDCI is not validated is a predetermined value (for example, “000” or “001”). May be.

When the predetermined value is the same as the value indicating the predetermined TCI state in FIG. 3 (for example, when the predetermined value is “000”, the user terminal indicates TCI state # 0), Whether or not the TCI field value in the DCI is a dummy may be determined depending on whether or not tci-PresentInDCI is CORESET that is valid.

Specifically, the user terminal determines the PDSCH scheduled by the DCI based on the TCI field value of the DCI transmitted in the CORESET (for example, CORESET # 0 in FIG. 2) with tci-PresentInDCI enabled. The TCI state may be determined, and PDSCH reception may be controlled based on the TCI state.

On the other hand, the user terminal may ignore the TCI field value of DCI transmitted in CORESET (for example, CORESET # 1 in FIG. 2) where tci-PresentInDCI is not activated.

As described above, in the first aspect, even when it is controlled whether or not the TCI field is present in the DCI, the DCI sizes can be made equal, so that the processing load related to the detection of the DCI at the user terminal Can be reduced.

(Other aspects)
In the first aspect described above, the case of using for demodulation of PDSCH based on the TCI state will be described, but the present embodiment is not limited to this. The present embodiment can be applied to reception processing of other signals, other channels, or other information (for example, DCI (DCI format 0_0, DCI format 0_1) or other DCI for scheduling an uplink shared channel). .

Also, the QCL may be read as QCL (spatially quasi co-located) in space.

(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 at least one combination of the plurality of aspects.

FIG. 4 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment. In the radio communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do.

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

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

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 at the same time using CA or DC. Moreover, the user terminal 20 may apply CA or DC using a plurality of cells (CC) (for example, 5 or less CCs, 6 or more CCs).

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

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

Numerology may be a communication parameter applied to transmission and / or reception of a certain signal and / or channel, for example, subcarrier interval, bandwidth, symbol length, cyclic prefix length, subframe length. , TTI length, number of symbols per TTI, radio frame configuration, filtering process, windowing process, and the like.

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

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

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

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

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

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

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

The downlink L1 / L2 control channel is a downlink control channel (PDCCH (Physical Downlink Control Channel) and / or EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel). Including at least one of Downlink control information (DCI: Downlink Control Information) including PDSCH and / or PUSCH scheduling information is transmitted by the PDCCH.

Note that scheduling information may be notified by DCI. For example, DCI that schedules DL data reception may be called DL assignment, DCI format 1_0, and DCI format 1_1. DCI that schedules UL data transmission is UL grant, DCI format 0_0, and DCI format 0_1. May be called.

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

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

<Wireless base station>
FIG. 5 is a diagram illustrating an example of the overall configuration of the radio base station according to the present embodiment. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.

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

In the baseband signal processing unit 104, with respect to user data, PDCP (Packet Data Convergence Protocol) layer processing, user data division / combination, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access) Control) Retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing are performed and the transmission / reception unit 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

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

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

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

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

The transmission / reception unit 103 may further include an analog beam forming unit that performs analog beam forming. The analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. can do. In addition, the transmission / reception antenna 101 can be configured by an array antenna, for example. Further, the transmission / reception unit 103 is configured to be able to apply single BF and multi-BF.

The transmission / reception unit 103 may transmit a signal using a transmission beam or may receive a signal using a reception beam. The transmission / reception unit 103 may transmit and / or receive a signal using a predetermined beam determined by the control unit 301.

Further, the transceiver 103 transmits a downlink (DL) signal (including at least one of a DL data signal (downlink shared channel), a DL control signal (downlink control channel), and a DL reference signal) to the user terminal 20. Then, an uplink (UL) signal (including at least one of a UL data signal, a UL control signal, and a UL reference signal) is received from the user terminal 20.

Moreover, the transmission / reception part 103 transmits DCI with respect to the user terminal 20 using a downlink control channel. Further, the transmission / reception unit 103 may transmit information (for example, tci-PresentInDCI) indicating whether or not the DCI includes a TCI field.

FIG. 6 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. In addition, in this example, the functional block of the characteristic part in this Embodiment is mainly shown, and it may be assumed that the radio base station 10 also has another functional block required for radio | wireless communication.

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

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

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

The control unit 301 schedules system information, downlink data signals (for example, signals transmitted by PDSCH), downlink control signals (for example, signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resource Control). In addition, the control unit 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is necessary for the uplink data signal.

The control unit 301 controls scheduling such as a synchronization signal (for example, PSS / SSS) and a downlink reference signal (for example, CRS, CSI-RS, DMRS).

The control unit 301 uses the digital BF (for example, precoding) by the baseband signal processing unit 104 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 103 to form a transmission beam and / or a reception beam. May be performed.

Also, the control unit 301 may control the relationship of pseudo collocation (QCL) among a plurality of signals, and may control at least one of setting, generation, and transmission of information (TCI state) related to QCL.

In addition, the control unit 301 controls at least one of generation and transmission of DCI. Specifically, the control unit 301 includes information (for example, tci-PresentInDCI) indicating whether DCI includes a TCI field (field for TCI) for at least one control resource set set within a predetermined bandwidth. ) Is controlled, the generation of DCI in all control resource sets within the predetermined bandwidth is controlled.

Specifically, the control unit 301 activates information indicating whether the DCI includes a TCI field for at least one control resource set within the predetermined bandwidth (for example, tci-PresentInDCI). The TCI field may be included in the DCI transmitted in all control resource sets within the predetermined bandwidth.

In addition, the control unit 301 controls the TCI state of the downlink shared channel scheduled by the DCI in the TCI field in the DCI transmitted in the control resource set in which the information (for example, tci-PresentInDCI) is enabled. A value indicating (QCL information) may be set.

Also, the control unit 301 may set a predetermined value in the TCI field in the DCI transmitted in a control resource set in which the information (for example, tci-PresentInDCI) is not validated.

Further, the control unit 301 may control transmission of information (for example, tci-PresentInDCI) indicating whether or not the DCI includes a TCI field. The control unit 301 may control transmission of the information for each control resource set in which the information (for example, tci-PresentInDCI) is validated. The control unit 301 may control transmission of the information by higher layer signaling.

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

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

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

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

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

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

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

<User terminal>
FIG. 7 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 transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. The transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may be configured to include one or more.

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

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

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

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

Note that the transmission / reception unit 203 may further include an analog beam forming unit that performs analog beam forming. The analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. can do. Further, the transmission / reception antenna 201 can be configured by, for example, an array antenna. The transmission / reception unit 203 is configured to be able to apply single BF and multi-BF.

The transmission / reception unit 203 may transmit a signal using a transmission beam, or may receive a signal using a reception beam. The transmission / reception unit 203 may transmit and / or receive a signal using a predetermined beam determined by the control unit 401.

The transceiver 203 receives a downlink (DL) signal (including at least one of a DL data signal (downlink shared channel), a DL control signal (downlink control channel), and a DL reference signal) from the radio base station 10, An uplink (UL) signal (including at least one of a UL data signal, a UL control signal, and a UL reference signal) is transmitted to the radio base station 10.

Also, the transmission / reception unit 203 receives DCI for the user terminal 20 using the downlink control channel. Further, the transmission / reception unit 203 may receive information (for example, tci-PresentInDCI) indicating whether or not the DCI includes a TCI field.

FIG. 8 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. In addition, in this example, the functional block of the characteristic part in this Embodiment is mainly shown, and it may be assumed that the user terminal 20 also has another functional block required for radio | wireless communication.

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

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

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

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

The control unit 401 uses the digital BF (for example, precoding) by the baseband signal processing unit 204 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 203 to form a transmission beam and / or a reception beam. May be performed.

Also, the control unit 401 controls processing related to DCI reception (for example, at least one of detection, blind decoding, demodulation, and decoding). Specifically, the control unit 401 includes information (for example, tci-PresentInDCI) indicating whether or not the DCI includes a TCI field (a TCI field) for at least one control resource set set within a predetermined bandwidth. ) Is controlled, reception of DCI is controlled in all control resource sets within the predetermined bandwidth.

Specifically, the control unit 401 activates information indicating whether the DCI includes a TCI field for at least one control resource set within the predetermined bandwidth (for example, tci-PresentInDCI). It may be assumed that the DCI transmitted in all control resource sets within the predetermined bandwidth includes a field for the TCI.

In addition, the control unit 401 is configured to perform downlink shared channel scheduling by the DCI based on the TCI field value in the DCI transmitted in the control resource set in which the information (for example, tci-PresentInDCI) is enabled. May be controlled.

Note that a predetermined value may be set in the TCI field in the DCI transmitted in the control resource set in which the information (for example, tci-PresentInDCI) is not validated.

Further, the control unit 401 may control reception of information (for example, tci-PresentInDCI) indicating whether or not the DCI includes a TCI field. The control unit 401 may control reception of the information for each control resource set in which the information (for example, tci-PresentInDCI) is validated. The control unit 401 may control transmission of the information by higher layer signaling.

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

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

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

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

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

The measurement unit 405 performs measurement on the received signal. The measurement unit 405 can be configured from a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present disclosure.

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

<Hardware configuration>
In addition, the block diagram used for description of this Embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one device physically and / or logically coupled, or directly and / or two or more devices physically and / or logically separated. Alternatively, it may be realized indirectly by connecting (for example, using wired and / or wireless) and using these plural devices.

For example, the radio base station, the user terminal, and the like in this embodiment may function as a computer that performs the processing of each aspect of this embodiment. FIG. 9 is a diagram illustrating an example of the hardware configuration of the radio base station and the user terminal according to the present embodiment. The wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.

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

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

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

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

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

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

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize frequency division duplex (FDD) and / or time division duplex (TDD). It 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 described above may be realized by the communication device 1004.

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

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

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

(Modification)
Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal (signaling). The signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard. Moreover, a component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, etc.

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

Furthermore, 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 the numerology. The slot may include a plurality of mini slots. Each minislot may be configured with one or more symbols in the time domain. The minislot may also be called a subslot.

Radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting signals. Different names may be used for the radio frame, subframe, slot, minislot, and symbol. For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot is called a TTI. May be. That is, the subframe and / or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. There may be. Note that a unit representing TTI may be called a slot, a minislot, or the like instead of a subframe.

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

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

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

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe. A TTI shorter than a 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, or a subslot.

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

A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Also, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks. One or more RBs include physical resource block (PRB), sub-carrier group (SCG), resource element group (REG), PRB pair, RB pair, etc. May be called.

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

Note that the structure of the above-described radio frame, subframe, slot, minislot, symbol, etc. is merely an example. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in the slot, the number of symbols and RBs included in the slot or minislot, and included in the RB The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.

In addition, the information, parameters, and the like described in this specification may be expressed using absolute values, may be expressed using relative values from a predetermined value, or other corresponding information may be used. May be represented. For example, the radio resource may be indicated by a predetermined index.

In this specification, names used for parameters and the like are not limited names in any way. For example, 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 channels and information elements assigned to them. The name is not limited in any way.

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

Also, information, signals, etc. can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer. Information, signals, and the like may be input / output via a plurality of network nodes.

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

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

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

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

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

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

Also, software, instructions, information, etc. may be transmitted / received via a transmission medium. For example, software can use websites, servers using wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) , Or other remote sources, these wired and / or wireless technologies are included within the definition of transmission media.

The terms “system” and “network” used in this specification are used interchangeably.

In this specification, “base station (BS)”, “radio base station”, “eNB”, “gNB”, “cell”, “sector”, “cell group”, “carrier” and “component” The term “carrier” may be used interchangeably. A base station may also be called in terms such as a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmission point, a reception point, a femtocell, and a small cell.

The base station can accommodate one or a plurality of (for example, three) cells (also called sectors). 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, an indoor small base station (RRH: Remote Radio Head)) can also provide communication services. The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage.

In this specification, the terms “mobile station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” may be used interchangeably. .

A mobile station is defined by those skilled in the art as 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 It may also be called terminal, remote terminal, handset, user agent, mobile client, client or some other suitable terminology.

Also, the radio base station in this specification may be read by the user terminal. For example, each aspect of the present disclosure / this embodiment may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device). Good. In this case, the user terminal 20 may have a function that the wireless base station 10 has. In addition, words such as “up” and “down” may be read as “side”. For example, the uplink channel may be read as a side channel.

Similarly, a user terminal in this specification may be read by a radio base station. In this case, the wireless base station 10 may have a function that the user terminal 20 has.

In this specification, the operation performed by the base station may be performed by the upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal may include a base station and one or more network nodes other than the base station (for example, It is obvious that this can be done by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited thereto) or a combination thereof.

Each aspect / this embodiment described in this specification may be used alone, in combination, or may be switched according to execution. Further, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / this embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

Each aspect described in this specification / this embodiment includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system, 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access) ), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registration) (Trademark), systems using other appropriate wireless communication methods, and / or next-generation systems extended based on them may be applied.

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

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

As used herein, the term “determining” may encompass a wide variety of actions. For example, “determination” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data). It may be considered to “judge” (search in structure), ascertaining, etc. In addition, “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be "determining". Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.

As used herein, the terms “connected”, “coupled”, or any variation thereof, is any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “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”.

As used herein, when two elements are connected, using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples, the radio frequency domain Can be considered “connected” or “coupled” to each other, such as with electromagnetic energy having wavelengths in the microwave and / or light (both visible and invisible) regions.

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

Where the term “including”, “comprising”, and variations thereof are used in this specification or the claims, these terms are inclusive, as are the terms “comprising”. Intended to be Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the present embodiment described in this specification. The present invention can be implemented as modifications and changes without departing from the spirit and scope of the present invention determined based on the description of the scope of claims. Accordingly, the description herein is for illustrative purposes and does not give any limiting meaning to the present invention.

Claims

A receiving unit for receiving downlink control information (DCI);
When information indicating whether the DCI includes a field for transmission configuration indication (TCI) is enabled for at least one control resource set within a predetermined bandwidth, all controls within the predetermined bandwidth A controller that assumes that the DCI transmitted in the resource set includes a field for the TCI;
A user terminal comprising:
The control unit controls reception of a downlink shared channel scheduled by the DCI based on a field value for the TCI in the DCI transmitted in a control resource set in which the information is validated. The user terminal according to claim 1, wherein:
The user terminal according to claim 1 or 2, wherein a field value for the TCI in the DCI transmitted in a control resource set in which the information is not validated is a predetermined value. .
4. The user terminal according to claim 1, wherein the receiving unit receives the information for each control resource set for which the information is validated.
The user terminal according to claim 4, wherein the receiving unit receives the information by higher layer signaling.
A transmission unit for transmitting downlink control information (DCI);
When information indicating whether the DCI includes a field for transmission configuration indication (TCI) is enabled for at least one control resource set within a predetermined bandwidth, all the controls within the predetermined bandwidth A control unit including a field for the TCI in the DCI transmitted by the resource set;
A radio base station comprising: