WO2019211917A1 - User terminal and base station device - Google Patents

Abstract

The user terminal according to one aspect of the present disclosure comprises: a reception unit that receives setting information about a downlink control channel during a handover procedure and/or a cell adding procedure in dual connectivity or carrier aggregation; and a control unit that, on the basis of information about a search space set associated with each of reference signal resources included in the setting information, controls setting of each of search spaces in the search space set.

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

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

In an existing LTE system (for example, LTE Rel. 8-13), a radio base station (for example, eNB (eNode B)) has a physical layer control signal (for example, downlink control information (DCI: Downlink Control Information)). Is transmitted to a user terminal (UE: User Equipment) using a control channel (for example, PDCCH (Physical Downlink Control Channel)).

In a future radio communication system (for example, NR, 5G, 5G +, Rel. 15 or later), in a handover procedure, a user terminal performs SIB (System Information Block) 1 and OSI (Other in the handover destination cell (target cell). System Information), paging, and information on search space for random access (search space information) are assumed to be received. For example, the search space information may be included in setting information (PDCCH-ConfigCommon) of a downlink control channel (for example, PDCCH: Physical Downlink Control Channel) unique to the target cell.

However, as a result of the search space information not being set appropriately in PDCCH-ConfigCommon, there is a possibility that at least one search space for SIB1, OSI, paging, and random access in the handover destination cell (target cell) cannot be set appropriately.

Similar problems include the addition procedure of the primary secondary cell (PSCell: Primary Secondary Cell) in Dual Connectivity (DC) and the secondary cell (SCell: Secondary Cell) in DC or Carrier Aggregation (CA). At least one of the additional procedures can occur.

The present invention has been made in view of such a point, and a user terminal and a radio that can appropriately set a search space in at least one of a handover destination cell, a cell added by DC, and a cell added by CA One of the purposes is to provide a base station.

A user terminal according to an aspect of the present disclosure includes a receiving unit that receives setting information related to a downlink control channel during at least one of a handover procedure and a cell addition procedure in dual connectivity or carrier aggregation, and the setting information And a control unit that controls the setting of each search space in the search space set based on information about the search space set associated with each reference signal resource included.

According to one aspect of the present disclosure, a search space can be appropriately set in at least one of a handover destination cell, a cell added by DC, and a cell added by CA.

FIG. 1 is a conceptual diagram illustrating an example of PDCCH-ConfigCommon. FIG. 2 is a conceptual diagram illustrating an example of RACH-ConfigDedicated. FIG. 3 is a diagram illustrating an example of PDCCH-ConfigCommon according to the first aspect. FIG. 4 is a diagram illustrating an example of RACH-ConfigDedicated according to the second mode. FIG. 5 is a diagram illustrating an example of RACH-ConfigDedicated according to the second mode. FIG. 6 is a diagram illustrating an example of RACH-ConfigDedicated according to the second mode. FIG. 7 is a diagram illustrating an example of PDCCH-ConfigCommon according to the second aspect. FIG. 8 is a diagram showing an example of a schematic configuration of the radio communication system according to the present embodiment. FIG. 9 is a diagram illustrating an example of the overall configuration of the radio base station according to the present embodiment. FIG. 10 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. FIG. 11 is a diagram illustrating an example of the overall configuration of the user terminal according to the present embodiment. FIG. 12 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. FIG. 13 is a diagram illustrating an example of a hardware configuration of the radio base station and the user terminal according to the present embodiment.

In future wireless communication systems (for example, NR, 5G, 5G +, Rel. 15 or later), physical layer control signals (for example, downlink control information (DCI)) are transmitted to wireless base stations (for example, BS). (Base Station), transmission / reception point (TRP: Transmission / Reception Point), eNB (eNodeB), gNB (NR NodeB), etc.) to transmit to the user terminal, control resource set (CORESET : COntrol REsource SET) is being considered.

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

The predetermined resource unit includes, for example, a control channel element (CCE: Control Channel Element), a CCE group including one or more CCEs, and a resource element group (REG: Resource Element) including one or more resource elements (RE: Resource Element). Group), one or more REG bundles (REG group), and at least one physical resource block (PRB).

The user terminal monitors (blind decoding) DCI mapped to a predetermined resource unit in CORESET (or search space in CORESET), and detects DCI for the user terminal.

By the way, in the future wireless communication system, during at least one of the handover procedure and the cell addition procedure in dual connectivity (DC) or carrier aggregation (CA), the user terminal sets configuration information on PDCCH specific to the cell. (Also referred to as PDCCH-ConfigCommon, common PDCCH information, etc.).

Here, PDCCH-ConfigCommon is added at the handover destination cell (target cell, primary cell (PCell: Primary Cell)), primary secondary cell (PSCell: Primary Secondary Cell) added by DC, and DC or CA. Configuration information related to PDCCH specific to at least one secondary cell (SCell: Secondary Cell).

FIG. 1 is a conceptual diagram showing an example of PDCCH-ConfigCommon. As shown in FIG. 1, PDCCH-ConfigCommon includes a predetermined number (for example, a maximum of 2) of CORESET information (also referred to as commonControlResourcesSets, commonCoReSets, common CORESET information, etc.), and a predetermined number (for example, a maximum of 4) search spaces. Information (also referred to as commonSearchSpaces, commonSearchSpaces, common search space information, etc.).

Further, the PDCCH-ConfigCommon may include information on the following search spaces (for example, search space identifier (ID, searchSpaceID)).
Information related to search space for SCI (search space for SIB1) for scheduling PDSCH that transmits SIB1 (System Information Block 1) (also called search space information for searchSpaceSIB1, rmsi-SearchSpace, SIB1, etc.)
Information related to DCI monitoring search space (search space for OSI) that schedules PDSCH for transmitting OSI (Other System Information) (also referred to as searchSpaceOtherSystemInformation, OSI search space information, etc.)
Information related to DCI monitoring search space (search space for paging) for scheduling PDSCH for transmitting paging (also called pagingSearchSpace, search space information for paging, etc.)
Search space for monitoring DCI for scheduling PDSCH for transmitting random access (RA) procedure messages (for example, random access response (message 2), collision resolution message (message 4)) (search space for RA) Information (also called ra-SearchSpace, RA search space information, etc.)

As shown in FIG. 1, the user terminal is based on the search space information (for example, search space ID) for SIB1, OSI, paging, and RA (for example, ID of the search space), information on time position (for example, PDCCH (DCI)). You may specify the period and offset (monitoringSlotPeriodicityAndOffset) of the slot which monitors PDCCH, and the symbol position (monitoringSymbolsWithinSlot) in a slot.

Moreover, in the said future radio | wireless communications system, RA procedure (for example, at least one of a target cell, PSCell, SCell) from a network (for example, radio base station (gNB: gNodeB)) with respect to a user terminal ( For example, one or more random access preambles (RA preamble, random access channel, PRACH (Physical Random Access Channel)) used in non-collision type random access (CFRA: contention free random access) procedure may be set.

This is based on the design philosophy that one or more RA preamble resources should be allocated to each user terminal because the user terminal does not know which beam is used to transmit the RA preamble in a multi-beam environment. is there.

The user terminal may receive setting information (RACH-ConfigDedicated, RACH individual information) related to the RA preamble allocated individually.

FIG. 2 is a conceptual diagram showing an example of RACH-ConfigDedicated. As shown in FIG. 2, RACH-ConfigDedicated is information related to reference signal resources associated with information (for example, an identifier (ID, ra-PreambleIndex) of RA preamble) related to each RA preamble allocated to the user terminal for CFRA. (Cfra-Resources) may be included.

The reference signal resource may be, for example, at least one of a synchronization signal block (SSB: Synchronization Signal Block) and a channel state information reference signal (CSI-RS: Channel State Information-Reference Signal).

The SSB is a signal block including a synchronization signal (SS) and a broadcast channel (also referred to as a broadcast signal, PBCH, NR-PBCH, etc.), and may be called an SS / PBCH block, an SSB resource, or the like.

As shown in FIG. 2, RACH-ConfigDedicated is information on SSB resources (also referred to as ssb-ResourceList, CFRA-SSB-Resource, SSB resource information, etc.) or a predetermined number for each RA preamble identifier (ra-PreambleIndex). Information on CSI-RS resources (also referred to as csirs-ResourceList, CFRA-CSIRS-Resource, CSI-RS resource information, etc.).

As described above, based on RACH-ConfigDedicated, the user terminal has one or more reference signal resources (for example, SSB resources or one or more CSI-corresponding to one or more RA preambles allocated to the user terminal). RS resource) is set.

On the other hand, search space information (for example, search space ID) for SIB1, OSI, paging and RA in PDCCH-ConfigCommon can set only a single search space for each of SIB1, OSI, paging and RA. .

Therefore, regardless of the reference signal resources (for example, SSB resources or CSI-RS resources) associated with the RA preamble (beam), a single set for each of SIB1, OSI, paging and RA. Only search spaces can be used. As a result, when each search space is set using searchSpaceSIB1, searchSpaceOSI, pagingsearchSpace, and ra-searchSpace in PDCCH-ConfigCommon illustrated in FIG. 1, the PDSCH that transmits each of SIB1, OSI, paging, and RA is scheduled. There is a possibility that the user terminal cannot properly perform DCI monitoring.

In addition, when a search space corresponding to a reference signal resource (for example, an SSB resource or a CSI-RS resource) selected by the user terminal is set after a handover and a PSCell and an SCell are added, the overhead may increase. There is.

Therefore, the present inventors relate to reference signal resources (for example, SSB resources or CSI resources) associated with the RA preamble allocated to the user terminal in RACH-ConfigDedicated, for SIB1, OSI, paging and RA. The idea is to appropriately monitor DCI in the search space by setting at least one search space in the user terminal.

Specifically, information related to a search space for at least one of SIB1, OSI, paging, and RA is included in PDCCH-ConfigCommon in association with a reference signal resource (for example, an SSB resource or a CSI resource). Inspired (first aspect). In addition, RACH-ConfigDedicated was conceived to include information related to a search space for at least one of SIB1, OSI, paging and RA in association with a reference signal resource (for example, an SSB resource or a CSI resource). Second embodiment).

Hereinafter, the present embodiment will be described in detail with reference to the drawings.

(First aspect)
In the first aspect, information on a search space set associated with a reference signal resource (for example, an SSB resource or a CSI resource) is included in PDCCH-ConfigCommon.

Here, the search space set is a set of one or more search spaces. For example, at least one of a search space for SIB1, a search space for OSI, a search space for paging, and a search space for RA. May be included.

FIG. 3 is a diagram illustrating an example of PDCCH-ConfigCommon according to the first aspect. As shown in FIG. 3, PDCCH-ConfigCommon includes information on search space sets (also referred to as referenceSignalSpecificSearchSpaces or RS-specific search space information) associated with reference signal resources (for example, SSB resources or CSI-RS resources). May be included.

For example, referenceSignalSpecificSearchSpaces is information related to a search space (search space set) associated with an SSB resource (also referred to as a searchSpaceSSB, a searchSpaceSSB list (searchSpaceSSB-List)), or a search space associated with a CSI-RS resource (search Information on space sets (also referred to as searchSpaceCSI-RS, searchSpaceCSI-RS list (searchSpaceCSI-RS-List), etc.) may be included.

Whether the referenceSignalSpecificSearchSpaces include searchSpaceSSB or earchSpaceCSI-RS may be determined based on reference signal resources associated with the RA preamble. For example, when the SSB resource is associated with the RA preamble in RACH-ConfigDedicated, the referenceSignalSpecificSearchSpaces may include searchSpaceSSB. On the other hand, when the SSB resource is associated with the RA preamble in RACH-ConfigDedicated, the referenceSignalSpecificSearchSpaces may include searchSpaceCSI-RS. Note that referenceSignalSpecificSearchSpaces may include both searchSpaceSSB and earchSpaceCSI-RS.

As described above, a reference signal resource (for example, an SSB resource or a CSI-RS resource) may be associated with a search space set set by referenceSignalSpecificSearchSpaces. Further, the reference signal resource may be associated with an RA preamble allocated to the user terminal in RACH-ConfigDedicated.

Each searchSpaceSSB in referenceSignalSpecificSearchSpaces includes at least information related to an SSB resource (for example, an identifier of an SSB resource (SSB-Index)) and information related to a search space set associated with the SSB resource (search space set information, searchSpaceSet). One may be included.

Each searchSpace CSI-RS in referenceSignalSpecificSearchSpaces includes information on CSI-RS resources (for example, CSI-RS resource identifier (CSI-RS-Index)) and information on search space sets associated with the CSI-RS resources. (Search space set information, searchSpaceSet) may be included.

The search space set information (searchSpaceSet) includes the search space information for SIB1 (searchSpaceSIB1, rmsi-SearchSpace), the search space information for OSI (searchSpaceOtherSystemInformation), the search space information for paging (pagingSearchSpace), and the search for RA. It may include at least one of space information (ra-SearchSpace).

As shown in FIG. 3, the search space information for SIB1, OSI, paging, and RA may each include a search space identifier (SearchSpaceId). The user terminal, based on the SearchSpaceId, information on the time position of the search space (or the time position of monitoring the PDCCH (DCI)) (for example, the period and offset (monitoringSlotPeriodicityAndOffset) of the slot for monitoring the PDCCH, The symbol position (monitoringSymbolsWithinSlot) may be specified.

The user terminal may receive the PDCCH-ConfigCommon during at least one of the handover procedure and the cell addition procedure in dual connectivity or carrier aggregation. Based on the referenceSignalSpecificSearchSpaces included in the PDCCH-ConfigCommon, the user terminal searches each search space in the search space set associated with the SSB resource or CSI-RS resource (for example, for SIB1, for OSI, for paging, for RA) At least one of the at least one search space) may be set.

Further, the user terminal uses the RA preamble assigned to the user terminal in RACH-ConfigDedicated, and uses the RA preamble assigned to the user terminal, the random access procedure in at least one of the target cell in the handover procedure, PSCell added in DC, DC or CA in CA May start.

Note that a reference signal resource (for example, an SSB resource or a CSI-RS resource) associated with the search space set described above may be associated with an RA preamble used in non-collision type random access (CFRA). That is, the referenceSignalSpecificSearchSpaces may be information related to a search space set associated with a reference signal resource in the case of CFRA.

If the CFRA fails, the user terminal may try random access (contention based random access (CBRA)) using a collision type RA preamble (contention RA preamble).

For the CBRA procedure, a single search space set (e.g., search space for SIB, search space for OSI, regardless of reference signal resources (e.g., SSB resources) (common to all reference signal resources), At least one of a search space for paging and a search space for RA may be set.

As shown in FIG. 3, PDCCH-ConfigCommon may include information (searchSpaceAnySSB, search space information for CBRA) related to a search space set applied to any reference signal resource for CBRA (for example, SSB resource). . The searchSpaceAnySSB includes the search space information for SIB1 (searchSpaceSIB1, rmsi-SearchSpace), search space information for OSI (searchSpaceOtherSystemInformation), search space information for paging (pagingSearchSpace), and search space information for RA (ra-SearchSpace). May be included.

In the first aspect, since information related to a search space set associated with a reference signal resource (for example, an SSB resource or a CSI resource) is included in PDCCH-ConfigCommon, each search space in the search space set DCI can be monitored appropriately.

(Second aspect)
In the second mode, search space information for SIB1, OSI, paging, and RA is included in RACH-ConfigDedicated in association with reference signal resources (for example, SSB resources or CSI resources).

FIG. 4-6 is a diagram illustrating an example of RACH-ConfigDedicated according to the second mode. As shown in FIG. 4, RACH-ConfigDedicated includes information (CFRA-Resources, reference signal resource information) regarding reference signal resources for CFRA (for example, SSB resources or CSI-RS resources). Also good.

For example, CFRA-Resources includes information on SSB resources (ssb-Resource, ssb-Resource list (ssb-ResourceList)) or CSI-RS resources (csirs-Resource, csirs-Resource list (csirs- ResourceList)) may be included.

As shown in FIG. 5, each ssb-Resource included in CFRA-Resources includes an SSB resource (SSB) index (SSB-Index), an RA preamble index (ra-PreambileIndex), and SIB1 search space information ( searchSpaceSIB1, rmsi-SearchSpace), OSI search space information (searchSpaceOtherSystemInformation), paging search space information (pagingSearchSpace), and RA search space information (ra-SearchSpace). These search space information may be associated with the SSB identified by the SSB-Index.

As shown in FIG. 6, each csirs-Resource included in CFRA-Resources includes a CSI-RS resource index (CSI-RS-Index), an RA preamble index (ra-PreambileIndex), and SIB1 search space information. (SearchSpaceSIB1, rmsi-SearchSpace), search space information for OSI (searchSpaceOtherSystemInformation), search space information for paging (pagingSearchSpace), and search space information for RA (ra-SearchSpace) may be included. Such search space information may be associated with the CSI-RS resource identified by the CSI-RS-Index.

As described above, in the second mode, information on the search space for SIB1, OSI, paging, and RA may be included as the resource information for reference signals for CFRA. On the other hand, as described above, in CBRA, a single search space may be used regardless of reference signal resources.

Therefore, also in the second mode, as shown in FIG. 7, the PDCCH-ConfigCommon may include the search space information for CBRA (searchSpaceAnySSB). The searchSpaceAnySSB includes the search space information for SIB1 (searchSpaceSIB1, rmsi-SearchSpace), search space information for OSI (searchSpaceOtherSystemInformation), search space information for paging (pagingSearchSpace), and search space information for RA (ra-SearchSpace). May be included.

In the second aspect, since information related to a search space associated with a reference signal resource (for example, an SSB resource or a CSI resource) is included in PDCCH-ConfigCommon, DCI is appropriately monitored in each search space. be able to.

(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 one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

FIG. 8 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), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these.

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

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

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

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

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

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

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

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

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

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

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

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

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

Note that scheduling information may be notified by DCI. For example, DCI for scheduling DL data reception may be referred to as DL assignment, and DCI for scheduling UL data transmission may be referred to as UL grant.

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

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

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

<Wireless base station>
FIG. 9 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) processing, 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 transmit downlink control information (for example, DCI) using a control resource set (CORESET: CORN RESOURCE SET) associated with a specific search space.

Further, the transmission / reception unit 103 may transmit configuration information (PDCCH-ConfigCommon) regarding the downlink control channel in at least one of the handover procedure, the secondary cell addition procedure, and the primary secondary cell addition procedure. Moreover, the transmission / reception part 103 may transmit the setting information (RACH-ConfigDedicated) regarding RACH.

FIG. 10 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 wireless base station 10 also has other functional blocks necessary for wireless communication.

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

The control unit (scheduler) 301 controls the entire radio base station 10. The control unit 301 can be 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 on PDSCH), downlink control signals (for example, signals transmitted on PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resources Control). In addition, the control unit 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is necessary for the uplink data signal.

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

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

The control unit 301 may perform control to transmit DCI using CORESET. The control unit 301 may perform control to generate and transmit DCI using a specific DCI format and an RNTI corresponding to the format in a specific search space.

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

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

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

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

The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when PUCCH including HARQ-ACK is received, 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. 11 is a diagram illustrating 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. Note that the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.

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

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

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

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

The transmission / reception unit 203 may monitor a control resource set (CORESET: Control REsource SET) using a specific search space determined by the control unit 401 described later.

Further, the transmission / reception unit 203 may receive configuration information (PDCCH-ConfigCommon) related to the downlink control channel in at least one of the handover procedure, the secondary cell addition procedure, and the primary secondary cell addition procedure. Moreover, the transmission / reception part 103 may receive the setting information (RACH-ConfigDedicated) regarding RACH.

FIG. 12 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 other functional blocks necessary for wireless communication.

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

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

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

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

The control unit 401 controls the setting of each search space in the search space set based on the information on the search space set associated with each reference signal resource included in the setting information (PDCCH-ConfigCommon) on the downlink control channel. It may also be possible (first aspect).

The control unit 401 controls the setting of each search space in the search space set based on information on the search space set associated with each reference signal resource included in the RACH-ConfigDedicated configuration information (RACH-ConfigDedicated). It is also possible (second aspect).

The resource for each reference signal may be associated with a preamble allocated to the user terminal for a non-collision type random access procedure.

Each of the reference signal resources may be at least one of a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) resource.

The configuration information (PDCCH-ConfigCommon) related to the downlink control channel may include information related to a single search space common to all reference signal resources for the collision type random access procedure.

The search space set may include at least one of a search space for SIB (System Information Block) 1, a search space for OSI (Other System Information), a search space for paging, and a search space for random access. .

In addition, when the control unit 401 obtains various types of information notified from the radio base station 10 from the reception signal processing unit 404, the control unit 401 may update parameters used for control based on the information.

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

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

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

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

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

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

<Hardware configuration>
In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of 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 wireless base station, the user terminal, and the like in the present embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 13 is a diagram illustrating an example of a 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 above embodiments is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized similarly for other functional blocks.

The memory 1002 is a computer-readable recording medium such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to 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 for assigning radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. The definition of TTI is not limited to this.

The TTI may be a transmission time unit 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. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks. One or more RBs include physical resource blocks (PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. May be called.

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

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

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 / embodiment described in this specification, 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. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration 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, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and 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 / embodiment of the present disclosure 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). 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 / embodiment described in this specification may be used alone, may be used in combination, or may be switched according to execution. Further, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in 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 / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced 4G (4th generation mobile) communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802 .20, UWB (Ultra-WideBand), Bluetooth (registered trademark) ), A system using another appropriate wireless communication method, and / or a next generation system extended based on these methods.

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

Claims (6)

1. A receiver that receives configuration information regarding a downlink control channel during at least one of a handover procedure and a cell addition procedure in dual connectivity or carrier aggregation;
   A control unit that controls the setting of each search space in the search space set based on information related to the search space set associated with each reference signal resource included in the setting information;
   A user terminal comprising:
2. The user terminal according to claim 1, wherein each reference signal resource is associated with a preamble assigned to the user terminal for a non-collision type random access procedure.
3. The user terminal according to claim 1 or 2, wherein each reference signal resource is either a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) resource.
4. The user according to any one of claims 1 to 3, wherein the setting information includes information on a single search space common to all reference signal resources for a collision type random access procedure. Terminal.
5. The search space set includes at least one of a search space for SIB (System Information Block) 1, a search space for OSI (Other System Information), a search space for paging, and a search space for random access. The user terminal according to any one of claims 1 to 4, characterized in that:
6. A transmitter that transmits configuration information regarding a downlink control channel during at least one of a handover procedure and a cell addition procedure in dual connectivity or carrier aggregation;
   A control unit that controls the setting of each search space in the search space set based on information related to the search space set associated with each reference signal resource included in the setting information;
   A radio base station comprising:

Images