WO2020039483A1

WO2020039483A1 - User terminal

Info

Publication number: WO2020039483A1
Application number: PCT/JP2018/030670
Authority: WO
Inventors: 一樹武田; 高橋　秀明; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-08-20
Filing date: 2018-08-20
Publication date: 2020-02-27

Abstract

This user terminal according to one embodiment of the present disclosure is characterized by comprising: a reception unit that receives setting information about cross carrier scheduling; and a control unit that determines the number of downlink control channel candidates for each aggregation level, on the basis of an identifier of a search space in the setting information, and that controls monitoring of downlink control information, on the basis of the number of the downlink control channel candidates.

Description

User terminal

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

In a UMTS (Universal Mobile Telecommunications System) network, long term evolution (LTE: Long Term Evolution) has been specified for the purpose of higher data rates and lower delays (Non-Patent Document 1). Also, LTE-A (LTE Advanced, LTE @ Rel. 10, 11, 12, 13) has been specified for the purpose of further increasing the capacity and sophistication of LTE (LTE @ Rel. 8, 9).

Succession system of LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Rel. 14 or 15 or later) are also being studied.

In an existing LTE system (for example, LTE@Rel.8-14), a radio base station (for example, eNB (eNode @ B)) transmits a control signal of a physical layer (for example, downlink control information (DCI: Downlink @ Control @ Information)). Is transmitted to a user terminal (UE: User @ Equipment) using a downlink control channel (for example, PDCCH (Physical @ Downlink @ Control @ Channel)).

In a future wireless communication system (hereinafter, referred to as NR), it is considered to determine a set of search spaces (search space set) for each aggregation level, and monitor (blind decode) the search space set to detect DCI. ing. In addition, the search space set corresponds to the number (the number of times of blind decoding) of one or more candidates (candidates) (PDCCH candidates) of downlink control channels (for example, PDCCH) for each aggregation level configured (configured) in the user terminal. It is also considered to be determined based on this.

However, in the case of scheduling between different carriers (cross carrier scheduling), how to configure (configure) the number of PDCCH candidates for each aggregation level in which DCI to be cross-carrier scheduled is arranged in the user terminal is sufficient. Not considered.

If the number of PDCCH candidates for each aggregation level is not appropriately set in cross carrier carrier scheduling, as a result of not being able to appropriately determine a search space set based on the number of PDCCH candidates, DCI for cross carrier scheduling is appropriately monitored. May not be able to do so.

The present invention has been made in view of the above, and an object of the present invention is to provide a user terminal capable of appropriately controlling monitoring of DCI subjected to cross carrier scheduling.

A user terminal according to an aspect of the present disclosure, a receiving unit that receives setting information regarding cross carrier scheduling, and determines the number of downlink control channel candidates for each aggregation level based on an identifier of a search space in the setting information, A control unit that controls monitoring of downlink control information based on the number of the downlink control channel candidates.

According to an aspect of the present disclosure, it is possible to appropriately control monitoring of DCI subjected to cross carrier scheduling.

FIG. 1 is a diagram showing an example of search space setting information in PDCCH setting information. FIG. 2 is a diagram showing an example of the setting of the search space ID in the cross carrier scheduling setting information according to the first example. 3A and 3B are diagrams illustrating an example of the cross carrier scheduling setting information according to the first example. 4A and 4B are diagrams illustrating another example of the cross carrier scheduling setting information according to the first example. FIG. 5 is a diagram showing an example of the setting of the search space ID in the cross carrier scheduling setting information according to the second example. 6A and 6B are diagrams illustrating examples of the cross carrier scheduling setting information according to the second example. 7A and 7B are diagrams illustrating another example of the cross carrier scheduling setting information according to the second example. FIG. 8 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment. FIG. 9 is a diagram showing an example of the overall configuration of the radio base station according to the present embodiment. FIG. 10 is a diagram showing 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.

(Search space)
In NR, a user terminal (UE: User Equipment) monitors (blind decodes) a set of one or more search spaces (SS) (search space set) to detect DCI. The search space set is configured to include a set of one or more candidates (PDCCH candidates) of a downlink control channel (for example, PDCCH: Physical Downlink Control Channel). In this specification, “search space set” and “search space” may be interchanged with each other.

The search space set includes a search space set (common search space set (CSS: Common \ Search \ Space) set) used for monitoring (cell-specific) DCI common to one or more user terminals and a DCI specific to the user terminal. A search space set (user-specific search space (USS) set) used for monitoring may be included.

各 Each PDCCH candidate in the search space set is composed of a predetermined number of resource units according to the aggregation level. The predetermined resource unit may be a control channel element (CCE: Control @ Channel @ Element), a CCE group including one or more CCEs, or the like. Each CCE may include one or more resource elements (RE: Resource @ Element), one or more resource element groups (REG: Resource @ Element @ Group), one or more REG bundles (REG groups), and the like. Note that the REG may include one or more REs, and the REG bundle may include one or more REGs.

For example, when the aggregation level is 1, 2, 4, 8, or 16, each PDCCH candidate may be configured with 1, 2, 4, 8, or 16 consecutive resource units (for example, CCEs). .

{Also, a control resource set (CORESET: Control \ REsource \ SET) may be associated with the search space (or search space set). The coreset may be configured to include a predetermined frequency domain resource (for example, a predetermined number of resource blocks (physical resource blocks (PRB: Physical Resource Block))) and a time domain resource (for example, a predetermined number of symbols).

A search space set associated with CORESETp may be defined using CCEs corresponding to one or more PDCCH candidates in the search space set. For example, for example, the search space set s may be configured by a CCE having an index (index number, index value) represented by Expression 1 below.

In Formula ^{_{1, Yp, n μ s,}} f is a predetermined parameter, for example, in the CSS set 0, the USS sets, radio network temporary identifier (RNTI: Radio Network Temporary Identifier) to be determined on the basis of Is also good. N _{CCE, p} is the number of CCEs in CORESETp.

n _CI is the value of the carrier identification (CI) field when configuration information (also referred to as cross carrier scheduling configuration information, CrossCarrierSchedulingConfig, etc.) related to cross carrier scheduling is configured (configured). On the other hand, when the cross carrier scheduling setting information is not set (in the case of scheduling within the same carrier) or in the case of a CSS set, the value is 0.

Note that the cross-carrier scheduling setting information may be notified from the base station to the UE by, for example, higher layer signaling. Here, the upper layer signaling includes, for example, RRC (Radio Resource Control) signaling, broadcast information (Master Information Block (MIB: Master Information Block), system information block (SIB: System Information Block), etc.), MAC (Medium Access Control) ) Signaling (e.g., MAC Control Element (MAC \ CE)), other signals, or a combination thereof.

_{ms, nCI} is 0,... _{, Mp, s, nCI} ^(L) -1. M _{p, s,} ^{NCI (L)} _is a serving cell corresponding to the _{n CI} and the search space set s the aggregation level L (cell, carrier, component carrier (CC)) UE of PDCCH candidates to be set so as to monitor Is a number.

M _{p, s, max} ^(L) is M _{p, s, 0} ^(L) for the CSS set, and for the USS set, all n _CIs set for the aggregation level of the search space set s in CORESETp. _{May be the} largest M _{p, s, nCI} ^(L) .

As described above, the number M _{p, s, nCI} ^(L) of PDCCH candidates for each aggregation level L of the serving cell corresponding to n _CI is set in the UE. The UE monitors the DCI for the search space set determined based on the number _{Mp, s, nCI} ^(L) of the PDCCH candidates.

In the case of scheduling within the same carrier, the number of PDCCH candidates for each aggregation level of the cell (scheduling @ cell) performing the scheduling may be included in the setting information (search space setting information, SearchSpace) related to the search space set. The search space configuration information may be included in configuration information on PDCCH (PDCCH configuration information, PDCCH-Config). At least one of the search space configuration information and the PDCCH configuration information may be notified to the UE by higher layer signaling.

FIG. 1 is a diagram showing an example of search space setting information in PDCCH setting information. As shown in FIG. 1, the PDCCH configuration information (PDCCH-Config) may include a list (search space list, SearchSpaceToAddModList) of a predetermined number (for example, up to 10) of search space configuration information (SearchSpace). Good.

Each search space setting information (SearchSpace) monitors an identifier (search space ID, SearchSpaceID) of a search space (or search space set), an identifier of a RESET associated with the search space (CORESET @ ID, controlResourceSetId), and the search space. It may include information indicating at least one of information indicating a cycle and an offset (monitoringSlotPeriodicityAndOffset), a period of the search space, the number of symbols in a slot (monitoringSymbolWithinSlot), and the number of PDCCH candidates (nofCandidates) for each aggregation level in the search space. .

However, when cross-carrier scheduling is set, how to configure (configure) the number of PDCCH candidates for each aggregation level in which DCI to be cross-carrier scheduled is arranged has not been sufficiently studied. If the number of the PDCCH candidates is not appropriately set, the search space set cannot be appropriately determined based on the number of the PDCCH candidates, and as a result, it may not be possible to properly monitor the DCI subjected to cross carrier scheduling.

Therefore, the present inventors include the information (search space ID) indicating the number of PDCCH candidates for each aggregation level in the cross carrier scheduling configuration information (CrossCarrierSchedulingConfig) to appropriately monitor the DCI for cross carrier scheduling. With the idea of controllability, the present invention has been achieved.

Specifically, the UE receives the cross-carrier scheduling setting information, determines PDCCH candidates (the number of downlink control channel candidates) for each aggregation level based on the search space ID in the cross-carrier scheduling information, and The monitoring of the downlink control information is controlled based on the number of candidates.

Hereinafter, the present embodiment will be described in detail with reference to the drawings. In the following, the cross carrier scheduling setting information is assumed to be CrossCarrierSchedulingConfig in ServingCellConfig, but this is merely an example, and any information may be used as long as the setting information is related to cross carrier scheduling.

(First aspect)
In the first aspect, the UE determines a PDCCH candidate for each aggregation level based on the search space ID of the “scheduling cell” set in the cross carrier scheduling setting information, and performs downlink based on the number of the PDCCH candidates. Controls monitoring of control information.

Here, the scheduling cell (scheduling @ cell) refers to a case where a shared channel (for example, PDSCH or PUSCH) of the second cell is scheduled (cross-carrier scheduling) by DCI transmitted in the first cell. This is the first cell that performs scheduling of the shared channel of the second cell. In addition, a scheduled cell (scheduled @ cell) is a second cell in which the shared channel is scheduled in the above case.

FIG. 2 is a diagram showing an example of the setting of the search space ID in the cross carrier scheduling setting information according to the first example. In FIG. 2, it is assumed that cross-carrier scheduling from cell #A (first cell, scheduling cell) to cell #B or #C (second cell, scheduled cell) is performed.

As shown in FIG. 2, the UE receives a search space list (SearchSpaceToAddModList) of one or more search space setting information (SearchSpace) set in each of cells #A to #C. The search space list may be provided for each partial band (BWP: Bandwidth @ Part) in each cell.

Here, the BWP is a partial band in a carrier (also referred to as a serving cell, a cell, a component carrier (CC: Component @ Carrier), etc.). The BWP may include a BWP for DL (DL @ BWP) and a BWP for UL (UL @ BWP).

For example, in FIG. 2, the search space list for cell #A includes search spaces # 1 and # 2 for own cell (own @ cell) and search spaces # 3 and # 4 for other cells (other @ cell). It may be. As shown in FIG. 2, the search space for the other cell may be a search space for each cell on which cross-carrier scheduling is performed from cell #A. For example, search spaces # 3 and # 4 may be search spaces for cells #B and #C for which cross carrier scheduling is performed from cell #A, respectively.

The search space lists for cells #B and #C may include search spaces # 1 and # 2 for the own cell (cells #B and #C), respectively. The configuration information (ServingcellConfig) of cells #B and #C configured in the UE may include cross-carrier scheduling configuration information (CrossCarrierSchedulingConfig) of cells #B and #C, respectively.

A search space ID indicating a search space in the search space list for cell #A may be set in a predetermined information item (IE: Information @ Element) in the cross carrier scheduling setting information. The predetermined information item may be called, for example, SchedulingCellSearchSpace, a search space ID of a scheduling cell, or the like.

For example, in FIG. 2, the search space ID # 3 in the search space list of the cell #A is specified in the SchedulingCellSearchSpace in the cross carrier scheduling setting information of the cell #B. On the other hand, in the SchedulingCellSearchSpace in the cross carrier scheduling setting information of the cell #C, the search space ID # 4 in the search space list of the cell #A is specified.

The UE acquires the number of PDCCH candidates (nrofCandidates in FIG. 1) for each aggregation level in the search space setting information indicated by the search space ID, and indicates the search space ID based on the number of PDCCH candidates. CCEs constituting a search space (set) may be determined. For example, the CCE configuring the search space may be determined based on Equation 1 above, and the monitoring of DCI for performing cross-carrier scheduling from cell #A to cell #B or #C may be controlled.

FIGS. 3A and 3B are diagrams showing an example of the cross carrier scheduling setting information according to the first example. The names of the IEs shown in FIGS. 3A and 3B are merely examples, and are not limited to those shown. As shown in FIGS. 3A and 3B, the cross carrier scheduling configuration information (CrossCarrierSchedulingConfig) includes either information relating to scheduling of the own cell (own) or information relating to scheduling by another cell (cross carrier scheduling) (other). You may.

As the information (other) related to scheduling by another cell, for example, at least one of a cell identifier (cell index, scheduling cell ID, schedulingCellId) for signaling DCI, and a carrier identification field value (cif-InSchedulingCell) indicating the cell is used. May be included.

Note that the DCI may be, for example, DCI (DL assignment, DCI format 1_0 or 1_1) for scheduling PDSCH, DCI (UL grant, DCI format 0_0 or 0_1) for scheduling PUSCH, or the like.

As shown in FIG. 3A, when the information (other) related to scheduling by another cell is included in the cross carrier scheduling configuration information (CrossCarrierSchedulingConfig), the search space ID (schedulingCellSearchSpace) of the other cell (scheduling cell) is set to the cross carrier scheduling configuration. It may be included in the information. When the cross carrier scheduling setting information includes information (own) related to the scheduling of the own cell, the search space ID need not be included.

For example, in the case shown in FIG. 2, the search space ID (schedulingCellSearchSpace) in the cross carrier scheduling setting information of the cell #B or #C is replaced with the search space ID (for example, the search space # 3) in the search space list of the cell #A. Alternatively, # 4) may be set.

Alternatively, as shown in FIG. 3B, when information (other) related to scheduling by another cell is included in the cross carrier scheduling setting information, a search space ID list (schedulingCellSearchSpaceList) for each BWP is included in the cross carrier scheduling setting information. It may be. The list may include identifiers of the BWP (BWP @ ID, bwp-Id) and search space IDs (schedulingCellSearchSpace) corresponding to the BWP for the number of BWPs installed in the other cells.

4A and 4B are diagrams showing other examples of the cross carrier scheduling setting information according to the first example. Note that the names of the IEs shown in FIGS. 4A and 4B are merely examples, and are not limited to those shown. 4A and 4B, the description will focus on differences from FIGS. 3A and 3B.

In FIG. 4A, the search space ID (schedulingCellSearchSpace) of another cell (scheduling cell) together with at least one of the above schedulingCellId and cif-InSchedulingCell as information (other) related to scheduling by another cell in cross carrier scheduling configuration information (CrossCarrierSchedulingConfig). 3A is included.

Similarly, in FIG. 4B, a list (schedulingCellSearchSpaceList) of search space IDs for each BWP of the other cell (scheduling cell) is included as information (other) regarding scheduling by another cell in the cross carrier scheduling configuration information (CrossCarrierSchedulingConfig). 3B differs from FIG. 3B.

As described above, according to the first aspect, since the search space ID of the “scheduling cell” is included in the cross carrier scheduling configuration information, the UE determines the PDCCH candidate for each aggregation level based on the search space ID. The number can be determined, and based on the number of the PDCCH candidates, monitoring of DCI to be cross-carrier scheduled can be appropriately controlled.

(Second aspect)
In the second example, the UE determines PDCCH candidates for each aggregation level based on the search space ID of “scheduled cells” set in the cross carrier scheduling setting information, and performs downlink based on the number of PDCCH candidates. Controls monitoring of control information. In the second embodiment, the description will focus on the differences from the first embodiment.

FIG. 5 is a diagram showing an example of the setting of the search space ID in the cross carrier scheduling setting information according to the second example. In FIG. 5, it is assumed that cross carrier scheduling from cell #A (first cell, scheduling cell) to cell #B or #C (second cell, scheduled cell) is performed.

ＵＥAs shown in FIG. 5, the UE receives one or more search space setting information (SearchSpace) search space list (SearchSpaceToAddModList) set in each of cells #A to #C. The search space list may be provided for each BWP in each cell.

For example, in FIG. 5, the search space list for cell #A may include search spaces # 1 and # 2 for own cell (own @ cell). On the other hand, the search space list for cell #B may include search space # 1 for the own cell (cell #B) and search space # 2 for other cells. The search space list for cell #C may include search spaces # 1 and # 2 for the own cell (cell #C) and search space # 3 for another cell.

サーチ As shown in FIG. 5, the search space for the other cell may be a search space for each cell in which cross carrier scheduling is performed. For example, search space # 2 in the search space list of cell #B may be a search space for cell #A for performing cross-carrier scheduling on cell #B. Further, search space # 2 in the search space list of cell #C may be a search space for cell #A for performing cross-carrier scheduling on cell #C.

Also, the setting information (ServingcellConfig) of the cells #B and #C set (configured) in the UE may include the cross-carrier scheduling setting information (CrossCarrierSchedulingConfig) of the cells #B and #C, respectively.

The search space ID indicating the search space in the search space list for the cell #B or #C may be set in the predetermined IE in the cross carrier scheduling setting information. The predetermined IE may be called, for example, a ScheduledCellSearchSpace, a scheduled cell search space ID, or the like.

For example, in FIG. 5, the search space ID # 2 in the search space list of the cell #B is specified in the ScheduledCellSearchSpace in the cross-carrier scheduling setting information of the cell #B. On the other hand, the search space ID # 3 in the search space list of the cell #B is specified in the ScheduledCellSearchSpace in the cross carrier scheduling setting information of the cell #C.

The UE obtains the number of PDCCH candidates (nrofCandidates in FIG. 1) for each aggregation level in the search space setting information indicated by the search space ID, and performs the search indicated by the search space ID based on the number of PDCCH candidates. CCEs constituting a space (set) may be determined. For example, CCEs constituting the search space may be determined based on Equation 1 above, and monitoring of DCI for performing cross-carrier scheduling from cell #A to cell #B may be controlled.

The number of search spaces that can be set in each cell is limited to a predetermined number (for example, 10). For this reason, as shown in FIG. 2, when the search space ID (for example, # 3, # 4 in FIG. 2) in the search space list of the scheduling cell (cell #A) is specified in the cross carrier scheduling setting information When the number of other cells scheduled by the scheduling cell (for example, cells #B and #C in FIG. 2) increases, the number of search spaces that can be set in the scheduling cell itself (cell #A) decreases. As a result, in FIG. 2, there is a possibility that the UE cannot properly monitor DCI in the scheduling cell (cell #A).

On the other hand, as shown in FIG. 5, when the search space IDs (here, # 2 and # 3) in the search space list of the scheduled cells (cells #B and #C) are specified in the cross carrier scheduling setting information, The search space for the scheduling cell (cell #A) is included in the search space list of each scheduled cell (for example, cells #B and #C). For this reason, even if the number of other cells scheduled by the scheduling cell increases, it is possible to prevent a decrease in search space that can be set in the scheduling cell itself.

FIGS. 6A and 6B are diagrams showing an example of the cross carrier scheduling setting information according to the second example. The names of the IEs shown in FIGS. 6A and 6B are merely examples, and are not limited to those shown. As shown in FIGS. 6A and 6B, the cross carrier scheduling configuration information (CrossCarrierSchedulingConfig) includes either information relating to scheduling of the own cell (own) or information relating to scheduling by other cells (cross carrier scheduling) (other). You may.

As shown in FIG. 6A, when the cross carrier scheduling configuration information (CrossCarrierSchedulingConfig) includes information (other) related to scheduling by another cell, the search space ID (scheduledCellSearchSpace) of the own cell (scheduled cell) is used as the cross carrier scheduling configuration. It may be included in the information. When the cross carrier scheduling setting information includes information (own) related to the scheduling of the own cell, the search space ID need not be included.

For example, in the case shown in FIG. 5, the search space ID (scheduledCellSearchSpace) in the cross-carrier scheduling setting information of cell #B or #C is replaced with the search space ID (for example, search) in the search space list of cell #B or #C. Space # 2 or # 3) may be set.

Alternatively, as shown in FIG. 6B, when the cross-carrier scheduling setting information includes information (other) related to scheduling from another cell, a list (scheduledCellSearchSpaceList) of search space IDs for each BWP of the own cell (scheduled cell) is included. It may be included in the cross carrier scheduling setting information. The list may include as many BWP identifiers (BWP @ ID, bwp-Id) and search space IDs (scheduledCellSearchSpace) as the number of BWPs installed in the own cell.

FIGS. 7A and 7B are diagrams showing other examples of the cross carrier scheduling setting information according to the second example. The names of the IEs shown in FIGS. 7A and 7B are merely examples, and are not limited to those shown. 7A and 7B will be described focusing on differences from FIGS. 6A and 6B.

In FIG. 7A, the search space ID (scheduledCellSearchSpace) of the own cell (scheduled cell) together with at least one of the schedulingCellId and cif-InSchedulingCell as information (other) related to scheduling by another cell in the cross carrier scheduling configuration information (CrossCarrierSchedulingConfig). 6A is different from FIG.

Similarly, in FIG. 7B, a list (scheduledCellSearchSpaceList) of search space IDs for each BWP of the own cell (scheduled cell) is included as information (other) related to scheduling by another cell in cross carrier scheduling configuration information (CrossCarrierSchedulingConfig). 6B.

As described above, according to the second aspect, since the search space ID of “scheduled cell” is included in the cross carrier scheduling configuration information, the UE determines the PDCCH candidate for each aggregation level based on the search space ID. The number can be determined, and the DCI monitoring can be appropriately controlled based on the number of the PDCCH candidates.

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

FIG. 8 is a diagram showing an example of a schematic configuration of the wireless communication system according to the present embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of component carriers (carriers or cells) are integrated can be applied.

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

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

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

Also, the wireless communication system 1 may support dual connectivity between a plurality of RATs (Radio Access Technology) (multi-RAT dual connectivity (MR-DC: Multi-RAT Dual Connectivity)). The MR-DC has dual connectivity (LTE and NR) in which an LTE (E-UTRA) base station (eNB) becomes a master node (MN) and an NR base station (gNB) becomes a secondary node (SN). EN-DC: E-UTRA-NR {Dual} Connectivity, NR base station (gNB) becomes MN, and LTE (E-UTRA) base station (eNB) becomes SN. Dual connectivity (NR and LTE) NE-DC: NR-E-UTRA {Dual} Connectivity) may be included.

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

The user terminal 20 can perform communication using time division duplex (TDD: Time Division Duplex) and / or frequency division duplex (FDD: Frequency Division Duplex) in each cell. In each cell (carrier), a single numerology may be applied, or a plurality of different numerologies may be applied.

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

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

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

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

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

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

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

In the wireless communication system 1, as the downlink channel, a downlink shared channel (PDSCH: Physical Downlink Shared Channel), a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like shared by each user terminal 20 are used. Used. The PDSCH transmits user data, upper layer control information, SIB (System @ Information @ Block), and the like. Also, MIB (Master \ Information \ Block) is transmitted by PBCH.

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

スケジューリング The scheduling information may be notified by DCI. For example, a DCI that schedules DL data reception may be called a DL assignment, and a DCI that schedules UL data transmission may be called an UL grant.

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

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

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

<Base station>
FIG. 9 is a diagram showing an example of the overall configuration of the base station according to the present embodiment. The base station 10 includes a plurality of transmitting / receiving antennas 101, an amplifier unit 102, a transmitting / receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmitting / receiving antenna 101, the amplifier unit 102, and the transmitting / receiving unit 103 may be configured to include at least one each.

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

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

(4) The transmission / reception unit 103 converts the baseband signal precoded and output from the baseband signal processing unit 104 for each antenna into a radio frequency band, and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmitting / receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting / receiving antenna 101. The transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present disclosure. Note that the transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.

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

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

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

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

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

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

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

The control unit 301 performs scheduling (for example, resource transmission) of system information, a downlink data signal (for example, a signal transmitted on the PDSCH), and a downlink control signal (for example, a signal transmitted on the PDCCH and / or the EPDCCH; acknowledgment information and the like). Quota). Further, control section 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is required for an uplink data signal.

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

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

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

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

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

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

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

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

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

The transmitting / receiving section 103 transmits setting information on at least one of the cell group, the cell, the BWP, the RESET, the search space, and the cross carrier scheduling. Further, the transmitting / receiving section 103 transmits DCI.

The control unit 301 may control at least one setting of a cell group, a cell, BWP, CORESET, a search space, and cross carrier scheduling, and may control transmission of at least one of these setting information.

The control unit 301 determines the number of downlink control channel candidates for each aggregation level based on the search space identifier in the setting information regarding cross carrier scheduling, and performs mapping of downlink control information based on the number of downlink control channel candidates. It may be controlled.

Here, when cross carrier scheduling is performed from the first cell to the second cell, the search space identifier may indicate a search space set for the first cell (first mode). ).

場合 When cross-carrier scheduling is performed from the first cell to the second cell, the identifier of the search space may indicate a search space set for the second cell (second aspect).

The identifier of the search space may be set for each bandwidth portion of the first cell or the second cell (for example, FIGS. 3B, 4B, 6B, and 7B).

The search space identifier may be included in parallel with the scheduling information by another cell when the setting information includes information on scheduling by another cell (for example, FIGS. 3A, 3B, 6A, and 6B).

The identifier of the search space may be included in information on scheduling by another cell in the configuration information (for example, FIGS. 4A, 4B, 7A, and 7B).

<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 transmitting / receiving antennas 201, an amplifier unit 202, a transmitting / receiving unit 203, a baseband signal processing unit 204, and an application unit 205. The transmitting / receiving antenna 201, the amplifier unit 202, and the transmitting / receiving unit 203 may be configured to include at least one each.

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

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

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

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

FIG. 12 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment. Note that, in this example, functional blocks of characteristic portions in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

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

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

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

The control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the base station 10 from the reception signal processing unit 404. The control unit 401 controls generation of an uplink control signal and / or an uplink data signal based on a result of determining whether or not retransmission control is required for a downlink control signal and / or a downlink data signal.

The control unit 401 transmits a predetermined identifier (for example, C-RNTI, CS-RNTI, SI-RNTI, P-RNTI, RA-RNTI, TC-RNTI, INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC -PUCCH-RNTI, TPC-SRS-RNTI, SP-CSI-RNTI).

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

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

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

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

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

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

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

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

(4) The transmission / reception unit 203 transmits setting information on at least one of a cell group, a cell, BWP, CORESET, a search space, and cross carrier scheduling. Further, the transmitting / receiving section 203 transmits DCI.

The control unit 401 may control at least one setting of cell group, cell, BWP, CORESET, search space, and cross carrier scheduling, and may control transmission of at least one of these setting information.

The control unit 401 determines the number of downlink control channel candidates for each aggregation level based on the search space identifier in the setting information related to cross carrier scheduling, and performs mapping of the downlink control information based on the number of downlink control channel candidates. It may be controlled.

The search space identifier may be included in information on scheduling by another cell in the configuration information (for example, FIGS. 4A, 4B, 7A, and 7B).
<Hardware configuration>
Note that the block diagram used in the description of the above-described embodiment shows blocks in functional units. These functional blocks (components) are realized by an arbitrary combination of at least one of hardware and software. In addition, a method of implementing each functional block is not particularly limited. That is, each functional block may be realized using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated from each other). , Wired, wireless, etc.), and may be implemented using these multiple devices. The functional block may be realized by combining one device or the plurality of devices with software.

Here, the functions include judgment, determination, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (configuration unit) that causes transmission to function may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like. In any case, as described above, the realization method is not particularly limited.

For example, a base station, a user terminal, and the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method according to the present disclosure. FIG. 13 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to one embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .

In the present disclosure, the terms such as “apparatus”, “circuit”, “device”, “section”, and “unit” can be read interchangeably. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices illustrated in the drawing, or may be configured to exclude some of the devices.

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

The functions of the base station 10 and the user terminal 20 are performed, for example, by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002 so that the processor 1001 performs an arithmetic operation and communicates via the communication device 1004. And controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

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

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

The memory 1002 is a computer-readable recording medium, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), and other appropriate storage media. It may be constituted by one. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to execute the wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc) ROM, etc.), a digital versatile disc, At least one of a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (eg, a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. May be configured. The storage 1003 may be called an auxiliary storage device.

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

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

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

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

(Modification)
Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meaning. For example, channels, symbols and signals (signals or signaling) may be read interchangeably. Also, the signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like according to an applied standard. A component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, or the like.

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

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

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

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

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

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

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

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

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

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

Note that a long TTI (for example, a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (for example, a shortened TTI, etc.) may be replaced with a TTI shorter than the long TTI and 1 ms. The TTI having the above-described TTI length may be replaced with the TTI.

A resource block (RB: Resource Block) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same irrespective of the numerology, and may be, for example, 12. The number of subcarriers included in the RB may be determined based on numerology.

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

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

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

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

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

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

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

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

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

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

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

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

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

Note that the physical layer signaling may be called L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like. Also, the MAC signaling may be notified using, for example, a MAC control element (MAC @ CE (Control @ Element)).

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

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

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

ソフトウェア Also, software, instructions, information, and the like may be transmitted and received via a transmission medium. For example, if the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), the website, When transmitted from a server or other remote source, at least one of these wired and / or wireless technologies is included within the definition of a transmission medium.

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

In the present disclosure, “precoding”, “precoder”, “weight (precoding weight)”, “quasi-co-location (QCL)”, “TCI state (Transmission Configuration Indication state)”, “spatial relation” (Spatial relation), "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", " Terms such as "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel" are interchangeable Can be used for

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

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

In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user equipment” (UE), and “terminal” may be used interchangeably. .

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

少なくとも At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like. Note that at least one of the base station and the mobile station may be a device mounted on the mobile unit, the mobile unit itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, or the like), may be an unmanned moving object (for example, a drone, an autonomous vehicle), or may be a robot (maned or unmanned). ). Note that at least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

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

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

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

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

Each aspect / embodiment described in the present disclosure is applicable to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system, 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802 .20, UWB (Ultra-WideBand), Bluetooth (registered trademark) ), A system using other appropriate wireless communication methods, a next-generation system extended based on these, and the like. Further, a plurality of systems may be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

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

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

用語 The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, “judgment (decision)” means judging, calculating, computing, processing, deriving, investigating, searching (upping, searching, inquiry) ( For example, a search in a table, database, or another data structure), ascertaining, etc., may be regarded as "deciding".

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

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

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

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

As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements. And may include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”.

In this disclosure, where two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, the radio frequency domain, microwave It can be considered to be "connected" or "coupled" to each other using electromagnetic energy having a wavelength in the region, light (both visible and invisible) regions, and the like.

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

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

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

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

Claims

A receiving unit that receives setting information related to cross carrier scheduling,
A control unit that determines the number of downlink control channel candidates for each aggregation level based on the identifier of the search space in the configuration information, and controls monitoring of downlink control information based on the number of the downlink control channel candidates.
A user terminal comprising:
The method according to claim 1, wherein when cross-carrier scheduling is performed from a first cell to a second cell, the search space identifier indicates a search space set for the first cell. User terminal.
The method according to claim 1, wherein, when cross-carrier scheduling is performed from a first cell to a second cell, the search space identifier indicates a search space set for the second cell. User terminal.
4. The user terminal according to claim 2, wherein the identifier of the search space is set for each bandwidth portion of the first cell or the second cell. 5.
5. The search space identifier according to claim 1, wherein when the configuration information includes information on scheduling by another cell, the search space identifier is included in parallel with the scheduling information by another cell. 6. User terminal as described.
5. The user terminal according to claim 1, wherein the search space identifier is included in information related to scheduling by another cell in the configuration information. 6.