User terminal and radiocommunication method

Abstract

To suppress system performance degradation, even when communication is performed using a downlink control channel configuration different from that of the existing LTE system, a user terminal includes: a receiving section configured to receive a downlink control channel in a control resource set; and a control section configured to control allocation determination by having ranges based on the number or maximum number of downlink control channel candidates for a specific aggregation level in the control resource set.

Description

1 / 46 USER TERMINAL AND RADIOCOMMUNICATION METHOD FIELD OF THE INVENTION

[001] The present invention relates to a user terminal and a method of radio communication in a next-generation mobile communication system. BACKGROUND OF THE INVENTION

[002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified to achieve a higher data rate, lower latency, or similar (see Non-patent Literature 1). In addition, Advanced LTE (LTE-A, LTE Rel. 10, 11 or 12) was specified to achieve a wider bandwidth and higher speed than LTE (LTE Rel. 8 or 9) and successor systems to LTE (such as Future Radio Access (FRA), Fifth Generation Mobile Communication System (5G), 5G+ (plus), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), and LTE Rel. 13, 14, 15 or subsequent versions) are also discussed.

[003] In existing LTE systems (such as LTE Rel. 8 to 13), downlink (DL) and / or uplink (UL) communication is performed using a 1 ms subframe (also known as a “transmission time interval (TTI)” or similar). This subframe is a unit of transmission time for a channel-encoded data packet and also serves as a unit of processing for scheduling, link adaptation, retransmission control (HARQ request: Hybrid Automatic Repeat) or similar.

[004] A base radio station controls the allocation (scheduling) of data to the user terminal and notifies the user terminal of the data scheduling using downlink control information. Petition 870200060015, dated 05 / 14 / 2020, page 64 / 177 2 / 46 (DCI). The user terminal performs reception processing (such as demodulation or decoding) by monitoring a downlink control channel (PDCCH: Downlink Physical Control Channel), where downlink control information is transmitted, and controls the reception of DL data and / or transmission of uplink data based on the received downlink control information.

[005] In the downlink control channel (PDCCH / EPDCCH (Enhanced Physical Downlink Control Channel)), transmission is controlled using an aggregation of one or a plurality of control channel elements (CCE) or enhanced control channel elements (ECCE). In addition, each control channel element consists of a plurality of resource element groups (REG) or enhanced resource element groups (EREG). The resource element group is also used when the control channel is mapped to the resource element (RE). [List of quotations] [Literature unrelated to patents]

[006] Non-patent literature 1: 3GPP TS 36,300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); General description; Stage 2 (Release 8)”, April 2010 SUMMARY OF THE INVENTION

[007] For future radio communication systems (such as LTE Rel. 14, 15 or subsequent versions, 5G and NR), it is envisioned that data scaling will be controlled using a different configuration than that existing in the LTE system (e.g., LTE Rel. 13 or earlier versions). Specifically, for future radio communication systems, it is necessary to support the flexible use of numerology and frequency and implement a Petition 870200060015, dated 05 / 14 / 2020, page 65 / 177 3 / 46 dynamic frame configuration. Numerology refers, for example, to a communication parameter (such as subcarrier spacing and bandwidth) applied to the transmission or reception of a given signal.

[008] For future radio communication systems, the use of a different configuration from that of the existing LTE system for the control channel and / or the data channel was studied. If the downlink control channel configuration of the existing LTE system is used in a different configuration from that of the existing LTE system, performance degradation, such as degradation of communication equality and / or reduction of the transfer rate, may unfortunately occur.

[009] In view of the problems mentioned above, it is an object of the present invention to provide a user terminal and a radio communication method capable of suppressing system performance degradation, even when communication is carried out through the application of a downlink control channel configuration different from that of the existing LTE system.

[010] According to one aspect of the present invention, a user terminal is provided including: a receiving section configured to receive a downlink control channel in a control resource set; and a control section configured to control the allocation determination having intervals based on a number or a maximum number of downlink control channel candidates for the downlink control channel candidates for a given aggregation level in the control resource set.

[011] According to the present invention, it is possible to suppress the degradation of system performance even when communication is Petition 870200060015, dated 05 / 14 / 2020, pp. 66 / 177 4 / 46 performed through an application of a downlink control channel configuration different from that of the existing LTE system. BRIEF DESCRIPTION OF THE DRAWINGS

[012] Figures 1A and 1B are diagrams that illustrate examples of downlink control channels in an existing LTE radio communication system and in a future radio communication system;

[013] Figures 2A and 2B are diagrams illustrating an example of the allocation of PDCCH candidates in a CORESET according to a first aspect of the invention;

[014] Figures 3A and 3B are diagrams that illustrate an example of the allocation of PDCCH candidates in CORESET according to a second aspect of the invention;

[015] Figure 4 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment of the invention;

[016] Figure 5 is a diagram illustrating an example of a complete configuration of a radio base station according to an embodiment of the invention;

[017] Figure 6 is a diagram illustrating an example of a functional configuration of the base radio station according to an embodiment of the invention;

[018] Figure 7 is a diagram illustrating an example of a complete configuration of a user terminal according to an embodiment of the invention;

[019] Figure 8 is a diagram illustrating an example of a functional configuration of the user terminal according to an embodiment of the invention; and

[020] Figure 9 is a diagram that illustrates an example of configurations. Petition 870200060015, dated 05 / 14 / 2020, pp. 67 / 177 5 / 46 of the base radio station and user terminal hardware according to one embodiment of the invention. DESCRIPTION OF THE MODALITIES

[021] In the existing LTE system, a base radio station transmits downlink control information (DCI) to a UE via a downlink control channel (such as a physical downlink control channel (PDCCH) and an enhanced PDCCH (EPDCCH)). “Transmitting downlink control information” can be read as “transmitting a downlink control channel”.

[022] DCIs can be scheduling information, for example, including at least one piece of information to designate a time / frequency resource to which the data should be scheduled, information to designate a transport block size, information to designate a data modulation scheme, information to designate a HARQ process identifier, information about RS demodulation, and the like. DCIs used to schedule DL data reception and / or reference DL signal measurement may also be referred to as “DL assignment” or “DL grant”, and DCIs used to schedule UL data transmission and / or probe (measurement) UL signal transmission may also be referred to as “UL grant”.

[023] DL assignment and / or UL grant may contain information about a resource, a sequence, and a transmission format of the channel used to transmit a UL control signal (UCI: Uplink Control Information) such as HARQ-ACK feedback for DL ​​data or channel status information (CSI). Furthermore, the DCIs used to scale the UL control signal (UCI: Uplink Control Information) may be defined separately from the DL assignment. Petition 870200060015, dated 05 / 14 / 2020, pp. 68 / 177 6 / 46 and UL grant. Where one of the following DCIs can be determined based on a value of a specific bit field s included in the DCIs, which of a plurality of data values ​​the DCI payload size has, or which of the feature regions the DCIs are detected from, assuming that each DCI is mapped to different feature regions beforehand.

[024] The UE is configured to monitor a given number of downlink control channel candidate sets. Here, monitoring refers to decoding each downlink control channel to a target DCI format in this set. Decoding is also known as blind decoding (BD) or blind detection. The downlink control channel candidate is also referred to as a BD candidate, (E)PDCCH candidate, or similar.

[025] The PDCCH candidate configured to be monitored is also known as the search space. The base radio station allocates DCIs to a given PDCCH candidate included in the search space. The UE performs blind decoding for one or more candidate resources in the search space and detects the DCIs for this UE. The search space can be configured by upper-layer signaling, common to users, or individual upper-layer signaling for the user. In addition, two or more search spaces can be configured using the same carrier for this user terminal.

[026] In existing LTE, a plurality of aggregation level (AL) types are defined for the search space to achieve link adaptation. The AL corresponds to the number of resource units included in the DCI (radio resources having a given duration and a given bandwidth, such as control channel elements (CCE) or enhanced control channel elements (ECCE)). The AL can also be called the aggregation level of Petition 870200060015, dated 05 / 14 / 2020, page 69 / 177 7 / 46 CCE”. Furthermore, the search space has a plurality of PDCCH candidates for a given AL.

[027] DCIs are attached with a cyclic redundancy check (CRC) bit. The CRC is masked (scrambled) by an individual identifier for the UE (such as the Cell Radio Network Temporary Identifier (C-RNTI)) or a system-common identifier. The UE can detect DCIs in which the CRC is scrambled with the C-RNTI corresponding to the host terminal and DCIs obtained in which the CRC is scrambled with the system-common identifier.

[028] The search space includes a common search space commonly configured for UEs and a UE-specific search space configured for each UE. In the existing LTE PDCCH UE-specific search space, the AL (= number of CCEs) is 1, 2, 4, or 8. The number of PDCCH candidates is defined as 6, 6, 2, and 2” for AL = 1, 2, 4, and 8’, respectively.

[029] In the existing LTE system, the downlink control channel (or downlink control information) is transmitted using the entire system bandwidth (see Figure 1A). For this reason, for each subframe, the UE was required to monitor the entire system bandwidth and receive the downlink control information (perform blind decoding), regardless of whether or not the DL data was allocated.

[030] In comparison, in future radiocommunication systems, since communication is not carried out using the entire system band of a given carrier at all times, it is conceived that communication is controlled by dynamically or semi-statically defining a given frequency region (also called a “frequency band”) based on a communication purpose, a communication environment and / or the like. By Petition 870200060015, dated 05 / 14 / 2020, pp. 70 / 177 8 / 46 For example, in future radiocommunication systems, it is conceived that the transmission of downlink control information is controlled by configuring a given frequency region without allocating downlink control information to a specific UE for the entire system band at all times (see Figure 1B).

[031] The control resource set (CORESET) is a frame (also known as a box, set, or block) of a time resource and / or a frequency resource that contains a resource to which downlink control information is mapped or NR-PDCCH. Furthermore, the CORESET can be defined based on a resource unit size. For example, a CORESET size can be set to an integer multiple of a specific resource unit size. Additionally, the CORESET can include contiguous or discontinuous resource units.

[032] A resource unit is a unit of the resource allocated to the NRPDCCH. The resource unit may include any one of a resource block (RB) (such as a physical resource block (PRB) and / or a virtual resource block (VRB)), a pair of PRBs, NR-CCEs, NR-REGs, or a group of NR-REGs.

[033] The CORESET can be configured within a bandwidth portion (BWP) that is at least a portion of the system bandwidth (carrier bandwidth) or the maximum bandwidth that can be received by the corresponding user terminal. The UE can control reception by monitoring downlink control information within a CORESET range. Using the CORESET, the UE does not need to monitor the entire system bandwidth all the time when processing downlink control information during reception. Therefore, power consumption can be saved. Petition 870200060015, dated 05 / 14 / 2020, pp. 71 / 177 9 / 46

[034] The UE may have configured CORESET using CORESET configuration information (setup) from the base radio station (via a network, eNB, GNB, or a transmit / receive point).

[035] The base radio station is required to map the PDCCH candidate to the interior of CORESET, and the UE is required to recognize an allocation of the PDCCH candidate.

[036] In NR, it was studied that a hash function to determine a position (feature such as starting the CCE index) of the PDCCH candidate is based on a hash function for the EPDCCH of LTE. Furthermore, it was studied that UE determines the set of search spaces using the next set of parameters. AL Set - Number of PDCCH candidates for each AL - Occasion for PDCCH monitoring for the set of search spaces

[037] However, a specific determination method for each candidate PDCCH position has not been determined. In this respect, the inventors achieved the present invention by studying the determination method for each candidate PDCCH position.

[038] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The radiocommunication methods according to each embodiment can be applied alone or in combination. First Aspect

[039] According to the first aspect, starting the CCE indices (also referred to as “minimum CCE index”) of a plurality of PDCCH candidates for a given AL are allocated at equal intervals in Petition 870200060015, dated 05 / 14 / 2020, page 72 / 177 10 / 46 CORESET. That is, for a given AL, distances (intervals) between the initial CCE indices of two neighboring PDCCH candidates are equal.

[040] In a given AL, the range of initial CCE indices of the PDCCH candidate changes according to the number of PDCCH candidates (Mx).

[041] For example, as illustrated in Figure 2A, if a total number of CCEs (Ncce) in CORESET is 100, and the number of PDCCH candidates (Mx) from CORESET for a given AL is 2, the initial CCE index range of the PDCCH candidate is obtained based on a formula “Mcce / Mx”, which is 50. Assuming that the initial CCE index of the first PDCCH candidate is n, the initial CCE index of the second PDCCH candidate is “(n + 50)mod100”.

[042] For example, as illustrated in Figure 2B, if the number of PDCCH candidates (Mx) from CORESET for a given AL is “4”, the range of the initial CCE index of the PDCCH candidate is obtained based on a formula N cce / Mx”, which is “25”. If the initial CCE index of the first PDCCH candidate is defined as n, the initial CCE indices of the second, third and fourth PDCCH candidates will be “(n + 25)mod100”, “(n + 50)mod100” and “(n + 75)mod100”, respectively.

[043] When the number of PDCCH candidates is m (= 0, 1, ..., Mx-1), the initial CCE index of the PDCCH candidate, m, can be expressed as “(n + Ncce / Hx xm)modNccE”. That is, the range of the initial CCE index of the PDCCH candidate is inversely proportional to the number of PDCCH candidates (Mx). In this method, for a given AL, a plurality of PDCCH candidates can be allocated in the CORESET with equal intervals. Furthermore, PDCCH candidates can be allocated throughout the CORESET independently of the number of PDCCH candidates.

[044] Next, a specific method for determining the allocation of the PDCCH candidate will be described. Petition 870200060015, dated 05 / 14 / 2020, pp. 73 / 177 11 / 46

[045] The base radio station notifies the CORESET configuration information (setup) to the UE, and the UE and the base radio station determine the PDCCH candidate position (initial CCE index) based on the CORESET configuration information.

[046] For each server cell, upper-layer signaling (such as RRC signaling) configures “P” CORESETs for the UE. The CORESET number is p (0 < p < P). The CORESET configuration information may include at least one of a CORESET initial symbol index, the number of continuous CORESET symbols, the RB set, mapping from the CCE to the REG, a REG packet size in the case of interleaving the mapping from the CCE to the REG, or a quasi-colocation of the antenna port.

[047] For the UE, the CORESET set can be configured via top-layer signaling to monitor PDCCH. Additionally, the UE can have configured the number of PDCCH candidates for each aggregation level (CCE aggregation level) L, the PDCCH monitoring periodicity kp[slot], the PDCCH monitoring offset op[slot] (0 < op <kP), e um padrão de monitoramento de PDCCH dentro de um slot (por exemplo, o símbolo inicial do CORESET dentro de um slot para o monitoramento de PDCCH) para cada CORESET no conjunto CORESET através da sinalização de camada superior para monitorar o PDCCH .

[048] Each CORESET includes a set of CCEs numbered from 0 to “Ncce, p, kp - 1”. Here, “Ncce, p, kp” can be the number of CCEs in CORESET p within the monitoring periodicity kp. The “NCCE, p, kp” can also be the NCCE described above.

[049] The specific EU search space of the PDCCH at aggregation level L can be defined by the PDCCH candidate set for the level of Petition 870200060015, dated 05 / 14 / 2020, pp. 74 / 177 12 / 46 aggregation L. The aggregation level L can be one of 1, 2, 4, 8, and so on.

[050] In CORESET p, the corresponding CCE (initial CCE index) for the PDCCH mnCI candidate of the search space for a server cell in the corresponding carrier indication field value can be given in Formula (1). The factor Yp, k” of Formula (1) can be given by Formula (2). [Formula 1]mncí 'NCCE,p,kp LM^ ^1*ρ,ηιαχ + nc / ) mod [ty WL]} + i Equation (1);p_1)modD Equation (2)

[051] Here, a relation Yp, -1 = nRNTI Φ 0” can be satisfied. For example, when kp = 0”, a relation Yp, kp-1 = nRNTI” can be satisfied. The values ​​can be Ao = 39827”, Ai = 39829”, D = 65537” ei = 0, ..., L-1”.

[052] If a carrier indication field for a service cell in which PDCCH is monitored is set to UE, na” can be a carrier indication field value. Otherwise, na” can be zero.

[053] Ncce, p, kp” may be the number of CCEs in CORESET p at the PDCCH kp monitoring period.

[054] The mnCI (PDCCH candidate number)” is 0,..., M(L)p, nci -1”. Here, M(L)p, nci” is the number of PDCCH candidates configured to be monitored by the UE for the aggregation level L for a server cell corresponding to na”. That is, M(L)p, na” can be M x”.

[055] The nRNTI” may be a temporary radio network ID (RNTI) value (such as an individual identifier for the UE).

[056] OM(L)p, max” can be Mx”. That is, M(L)p, max” can be the number of PDCCH candidates for aggregation level L. Furthermore, M(L)p, max” Petition 870200060015, dated 05 / 14 / 2020, pp. 75 / 177 13 / 46 could also be “M(L)p, nci”.

[057] The “M(L)p, max” can be configured by top-layer signaling (such as “RRC signaling”). The “M(L)p, max” can be defined based on the specification in association with a parameter such as the aggregation level L.

[058] Each UE and base radio station can determine the positions of each PDCCH candidate using Formula (1). In this operation, it is possible to recognize the positions of each of the PDCCH candidates and allocate a plurality of PDCCH candidates at equal intervals. In this operation, since it is not necessary to notify the positions of each PDCCH candidate (initial CCE index), it is possible to suppress a header to notify the positions of the PDCCH candidates. Furthermore, since the PDCCH candidates can be mapped to resources sufficiently separate from all others, it is possible to improve the effect of selective frequency scheduling.

[059] If “M(L)p, max” is equal to “M(L)p, nci”, it is possible to suppress the notification header by suppressing the number of parameters to be notified.

[060] Since the initial CCE index range of the PDCCH candidate is based on the number of PDCCH candidates, it is possible to allocate PDCCH candidates uniformly in CORESET. In this allocation, it is possible to uniformize a possibility of blocking for a plurality of UEs (an event in which it is difficult to assign the PDCCH candidate to the UE). Second Aspect

[061] In the second aspect, a total number of PDCCH candidates (maximum number) for a given AL is fixed for a given value My in the CORESET. The initial CCE indices of a plurality of PDCCH candidates for a given AL have equal intervals in the CORESET. That is, the distances (intervals) of the initial CCE index between two neighboring PDCCH candidates for Petition 870200060015, dated 05 / 14 / 2020, pp. 76 / 177 14 / 46 a given AL are equal.

[062] The ranges of the initial CCE indices of PDCCH candidates for a given AL are determined based on the maximum number My of PDCCH candidates and are equal, regardless of the number of PDCCH candidates Mx.

[063] For example, as illustrated in Figure 3A, assuming that a total number of CCEs (Ncce) in the CORESET is 100, the maximum number of PDCCH candidates (My) in the CORESET for a given AL is 4 and the number of PDCCH candidates (Mx) in the CORESET for a given AL is 2, the range of the initial CCE index of the PDCCH candidate can be obtained from a formula Ncce / My”, which becomes 25. If the initial CCE index of the first PDCCH candidate is n, the initial CCE index of the second PDCCH candidate will be (n + 25)mod100.

[064] For example, as illustrated in Figure 3B, assuming that the number of PDCCH candidates (Mx) in CORESET for a given AL is 4, the range of the initial CCE index of the PDCCH candidate can be obtained from a formula Ncce / My, which happens to be 25. If the initial CCE index of the first PDCCH candidate is n, the initial CCE indices of the second, third and fourth PDCCH candidates become (n + 25)mod100, (n + 50)mod100 and (n + 75)mod100, respectively.

[065] Assuming that the number of PDCCH candidates is m (= 0, 1, ..., Mx - 1), the initial CCE index of the PDCCH candidate m can be expressed as (n + Ncce / My xm)modNccE. ​​That is, the range of the initial CCE index of the PDCCH candidate is inversely proportional to the maximum number of PDCCH candidates (My) without depending on the number of PDCCH candidates Mx. In this method, it is possible to allocate a plurality of PDCCH candidates in the CORESET to a given AL in equal intervals. Furthermore, if the number of Petition 870200060015, dated 05 / 14 / 2020, pp. 77 / 177 15 / 46 PDCCH candidates is the maximum number; it is possible to allocate PDCCH candidates throughout the CORESET.

[066] Next, a specific method for determining the allocation of PDCCH candidates will be described.

[067] The initial CCE index (CCE) corresponding to the PDCCH mNCI candidate of the search space for the CORESET pea server cell nCI can be given by Formula (1) as described above. However, according to the second aspect, the analysis of “M(L)p, max” in Formula (1) is different from the first aspect.

[068] “M(L)p, max” can be “My” as described above. That is, “M(L)p, max” can be the maximum number of PDCCH candidates for the aggregation level L. For example, “M(L)p, max” can be the maximum number of PDCCH candidates of all values ​​in the configured or DCI formats configured for the aggregation level L of CORESET p.

[069] The “M(L)p, max” can be defined depending on the specification or can be given by the information system (such as minimum remaining system information (RMSI)).

[070] Each of the UE and the base radio station can determine the positions of each PDCCH candidate using Formula (1). In this operation, it is possible to recognize the positions of each PDCCH candidate and allocate a plurality of PDCCH candidates at equal intervals. In this operation, since it is not necessary to notify the positions of each PDCCH candidate (initial CCE index), it is possible to suppress the header to notify the positions of the PDCCH candidates. Furthermore, since it is possible to fix the positions of PDCCH candidates, regardless of the number of PDCCH candidates actually configured, it is possible to communicate the terminal processing without depending on the configuration of the number of PDCCH candidates. Therefore, it is Petition 870200060015, dated 05 / 14 / 2020, pp. 78 / 177 16 / 46 It is possible to reduce the size of the processing circuit.

[071] Since “M(L)p, max” is defined by the specification or is reported by system information (such as broadcast information), it is not necessary to individually report “M(L)p, max” to the UE. Thus, it is possible to omit the header for the report. (Radio Communication System)

[072] A configuration of a radio communication system according to an embodiment of the invention will now be described. This radio communication system is implemented using any of the radio communication methods according to each embodiment of the invention, or a combination thereof.

[073] Figure 4 is a diagram illustrating an example of a schematic configuration of the radiocommunication system according to an embodiment of the invention. In radiocommunication system 1, carrier aggregation (CA) and / or dual connectivity (DC) is applicable, wherein a plurality of fundamental frequency blocks (component carriers) are integrated using a system bandwidth (e.g., 20 MHz) of the LTE system as a unit.

[074] Note that radiocommunication system 1 may be called 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), or similar, or may also be referred to as a system that implements these technologies.

[075] The radio communication system 1 has a base radio station 11 that forms a macro cell C1 having a relatively wide coverage and Petition 870200060015, dated 05 / 14 / 2020, pp. 79 / 177 17 / 46 base radio stations 12 (12a to 12c) arranged in macro cell C1 to form a small cell C2 having a narrower coverage than macro cell C1. In addition, user terminal 20 is arranged in macro cell C1 and in each small cell C2. The arrangement, number, and similar aspects of each cell and user terminal 20 are not limited to those illustrated in the drawings.

[076] User terminal 20 is connectable to both base radio stations 11 and 12. It is assumed that user terminal 20 is used in macro cell C1 and small cell C2 at the same time using AC or DC technology. In addition, user terminal 20 can apply AC or DC technology using a plurality of DC cells (e.g., five or fewer DCs or six or more DCs).

[077] Between user terminal 20 and base radio station 11, communication can be carried out using a narrow-bandwidth carrier (also referred to as an existing carrier or a legacy carrier) at a relatively low frequency band (e.g., 2 GHz). Meanwhile, between user terminal 20 and base radio station 12, a wide-bandwidth carrier can be used at a relatively higher frequency band (such as 3.5 GHz or 5 GHz), a carrier similar to that used for communication with base radio station 11 can also be used. Note that the frequency band configuration used by each base radio station is not limited to it.

[078] Between base radio stations 11 and 12 (or between two base radio stations 12), a wired connection (such as fiber optics based on common public radio interface (CPRI) or X2 interface) or wireless connection can be established.

[079] Each of the base radio stations 11 and 12 is connected to a layer 30 upper station device, and is connected to a core network 40 via the layer 30 upper station device. Note that the device of Petition 870200060015, dated 05 / 14 / 2020, p. 80 / 177 18 / 46 upper station 30 may include, for example, an access door device, a radio network controller (RNC), a mobility management entity (MME) or similar, but not limited to them. Furthermore, each base radio station 12 may be connected to the upper station 30 device via base radio station 11.

[080] Note that base radio station 11 is a base radio station having relatively wide coverage, and may also be referred to as “macro base station”, “integrated node”, “eNB (eNodeB)”, “transmit / receive point”, or similar. In addition, base radio station 12 is a base radio station having local coverage, and may also be referred to as “small base station”, “micro base station”, “pico base station”, “femto base station”, “Domestic eNodeB (HeNB)”, “remote radio head (RRH)”, “transmit / receive point”, or similar. Unless distinguished separately, base radio stations 11 and 12 will be collectively referred to as “base radio station 10”.

[081] Each user terminal 20 is a terminal that conforms to various types of communication such as LTE or LTE-A, and may also include a fixed communication terminal (fixed station) as well as a mobile communication terminal (mobile station).

[082] As with the radio access scheme of radio communication system 1, orthogonal frequency division multiple access (OFDMA) is applied to the downlink and single carrier frequency division multiple access (SC-FDMA) and / or OFDMA is applied to the uplink.

[083] OFDMA is a multi-carrier transmission scheme for achieving communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and data bands. Petition 870200060015, dated 05 / 14 / 2020, p. 81 / 177 19 / 46 mapping for each subcarrier. SC-FDMA is a single-carrier transmission scheme to reduce interference between terminals by dividing, per terminal, the system bandwidth into bands formed with one or more contiguous resource blocks and allowing a plurality of terminals to use different bands. Note that uplink and downlink radio access schemes are not limited to such a combination, and other radio access schemes may also be used.

[084] As the downlink channel of the radiocommunication system 1, a shared downlink channel (PDSCH: Physical Downlink Shared Channel) that is used by each user terminal 20 in a shared manner, a broadcast channel (PBCH: Physical Broadcast Channel) and an L1 / L2 downlink control channel, or similar, are employed. The PDSCH is used for transmitting user data, upper layer control information, a system information block (SIB), and the like. In addition, the PBCH is used to transmit a master information block (MIB).

[085] The L1 / L2 downlink control channel includes a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid ARQ indicator channel (PHICH) or similar. The PDCCH is used to transmit downlink control information (DCI), including PDSCH and / or PUSCH scheduling information, or similar.

[086] Note that DCIs can be used to report scheduling information. For example, DCIs used to schedule the reception of DL data can also be referred to as “DL assignment”, and DCIs used to schedule the transmission of UL data can also be Petition 870200060015, dated 05 / 14 / 2020, page 82 / 177 20 / 46 referred to as UL concession”.

[087] PCFICH is used to transmit the number of OFDM symbols used in PDCCH. PHICH is used to transmit Hybrid Automatic Repeat Request (HARQ) transmission acknowledgment information to PUSCH (e.g., also known as “retransmission control information”, “HARQ-ACK”, “ACK / NACK” or similar). EPDCCH is frequency division multiplexed with a downlink shared data channel (PDSCH) and is used to transmit DCI or similar, similar to PDCCH.

[088] As the uplink channel of the radiocommunication system 1, a shared uplink channel (PUSCH: Physical Uplink Shared Channel) that is used by each user terminal 20 in a shared manner, an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel), or similar, is employed. The PUSCH is used to transmit user data, upper-layer control information, and the like. In addition, the PUCCH is used to transmit radio quality information (CQI: Channel Quality Indicator), transmission acknowledgment information, scheduling request (SR), and the like from the downlink. The PRACH is used to transmit a random access preamble to establish the connection with a cell.

[089] As the downlink reference signal of the radiocommunication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS) or similar are transmitted. In addition, as the link reference signal Petition 870200060015, dated 05 / 14 / 2020, page 83 / 177 21 / 46 uplink of radio communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS) or similar is transmitted. Note that DMRS may also be referred to as a “UE-specific reference signal”. Furthermore, the transmitted reference signals are not limited to these. Radio Base Station

[090] Figure 5 is a diagram illustrating a complete configuration of the base radio station according to an embodiment of the invention. The base radio station 10 includes a plurality of transmit / receive antennas 101, an amplification section 102, a transmit / receive section 103, a baseband signal processing section 104, a call processing section 105, and a transmission path interface 106. Note that one or more transmit / receive antennas 101, one or more amplifier sections 102, and one or more transmit / receive sections 103 may be provided.

[091] User data transmitted on the downlink from base radio station 10 to user terminal 20 is entered from the upstation device 30 to the baseband signal processing section 104 via the communication path interface 106.

[092] In the baseband signal processing section 104, user data undergoes transmission processing, such as packet data convergence protocol layer (PDCP) processing, user data splitting / combining, radio link control (RLC) layer transmission processing, such as RLC retransmission control, medium access control (MAC) retransmission control (such as HARQ transmission processing), scheduling, transport format selection, channel encoding, Petition 870200060015, dated 05 / 14 / 2020, page 84 / 177 22 / 46 Inverse Fast Fourier Transform (IFFT) processing and pre-coding processing, and a resulting signal is transmitted to the transmit / receive section 103. In addition, the downlink control signal is also subjected to transmission processing, such as channel coding and inverse Fast Fourier Transform, and a resulting signal is also transmitted to the transmit / receive section 103.

[093] The transmission / reception section 103 converts the baseband signal pre-encoded by each antenna and generates from the baseband signal processing section 104 a radio frequency band and transmits the radio frequency band. The radio frequency signal subjected to frequency conversion in the transmission / reception section 103 is amplified by the amplification section 102 and is transmitted from the transmission / reception antenna 101. The transmission / reception section 103 may include a transmitter / receiver, a transmission / reception circuit, or a transmission / reception apparatus, as explained based on common knowledge in the technical field to which the present invention relates. Note that the transmission / reception section 103 may include an integrated transmission / reception section or may separately include a transmission section and a reception section.

[094] Meanwhile, for the uplink signal, a radio frequency signal received by the transmit / receive antenna 101 is amplified by the amplification section 102. The transmit / receive section 103 receives the uplink signal amplified by the amplification section 102. The transmit / receive section 103 frequency converts the received signal into a baseband signal and transmits the baseband signal to the baseband signal processing section 104.

[095] The baseband signal processing section 104 performs the Petition 870200060015, dated 05 / 14 / 2020, page 85 / 177 23 / 46 Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction decoding, MAC retransmission control reception processing, and RLC layer and PDCP layer reception processing for user data included in the incoming uplink signal and transmits the resulting signal to the higher station device 30 via the communication path interface 106. The call processing section 105 performs call processing (such as call setting and release) for a communication channel, base radio station state management 10, radio resource management, and the like.

[096] The communication path interface 106 transmits or receives signals to / from the higher station device 30 through a given interface. In addition, the communication path interface 106 can transmit or receive signals (backhaul signaling) to / from other base radio stations 10 through an inter-base station interface (such as fiber optic or X2 interface compatible with Common Public Radio Interface (CPRI)).

[097] The transmit / receive section 103 can transmit a downlink control channel (such as PDCCH) via the control resource set.

[098] Figure 6 is a diagram illustrating an example of a functional configuration of the base radio station according to an embodiment of the invention. Note that, although the functional blocks of characteristic parts of this embodiment are mainly illustrated in this example, the base radio station 10 may include other functional blocks necessary for radio communication.

[099] The baseband signal processing section 104, at least, Petition 870200060015, dated 05 / 14 / 2020, page 86 / 177 24 / 46 includes a control (scheduler) section 301, a transmission signal generation section 302, a mapping section 303, a reception signal processing section 304, and a measurement section 305. Note that some or all of these components may not be included in the baseband signal processing section 104, provided they are included in the base radio station 10.

[100] The control section (scheduler) 301 controls the base radio station 10 as a whole. The control section 301 may include a controller, a control circuit, or a control apparatus, as explained based on common knowledge in the technical field to which the present invention pertains.

[101] Control section 301 controls, for example, signal generation using transmission signal generation section 302, signal allocation using mapping section 303 and the like. In addition, control section 301 controls signal reception processing from reception signal processing section 304, signal measurement using measurement section 305 and the like.

[102] Control section 301 controls the scheduling (such as resource allocation) of system information, a downlink data signal (such as a signal transmitted via PDSCH) and a downlink control signal (such as a signal transmitted via PDCCH and / or EPDCCH or transmission acknowledgment information). Furthermore, control section 301 controls the 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 the uplink data signal or the like. Additionally, control section 301 controls the scheduling of a synchronization signal (such as PSS / SSS (Primary Synchronization Signal / Secondary Synchronization Signal)), the Petition 870200060015, dated 05 / 14 / 2020, page 87 / 177 25 / 46 downlink reference signal (such as CRS, CSI-RS and DMRS) and similar.

[103] Control section 301 controls the scheduling of an uplink data signal (such as a signal transmitted via PUSCH), an uplink control signal (such as a signal transmitted via PUCCH and / or PUSCH or transmission acknowledgment information), a random access preamble (such as a signal transmitted via PRACH), an uplink reference signal and the like.

[104] The transmission signal generation section 302 generates a downlink signal (such as a downlink control signal, a downlink data signal, and a downlink reference signal) based on an instruction from the control section 301 and sends the downlink signal to the mapping section 303. The transmission signal generation section 302 may include a signal generator, a signal generation circuit, or a signal generation apparatus, as explained based on common knowledge in the technical field to which the present invention relates.

[105] The transmission signal generation section 302 generates DL assignment to notify downlink data allocation information and / or UL grant to notify uplink data allocation information, for example, based on an instruction from the control section 301. Both DL assignment and UL grant are compatible with DCIs in DCI format. In addition, the downlink data signal is subjected to encoding and modulation processing, depending on a coding rate, a modulation scheme and the like determined based on channel state information (CSI) or similar from each user terminal 20. Petition 870200060015, dated 05 / 14 / 2020, page 88 / 177 26 / 46

[106] The mapping section 303 maps a downlink signal generated by the transmission signal generation section 302 to a given radio resource based on an instruction from the control section 301 and transmits it to the transmission / reception section 103. The mapping section 303 may include a mapper, a mapping circuit, or a mapping apparatus, as explained based on common knowledge in the technical field to which the present invention relates.

[107] The received signal processing section 304 performs reception processing (such as demapping, demodulation and decoding) for the reception signal input of the transmission / reception section 103. Here, the reception signal includes an uplink signal (such as an uplink control signal, an uplink data signal and an uplink reference signal) transmitted from the user terminal 20. The received signal processing section 304 may include a signal processor, a signal processing circuit or a signal processing apparatus, as explained based on common knowledge in the technical field to which the present invention relates.

[108] The received signal processing section 304 transmits the information decoded through the reception processing to the control section 301. For example, when the PUCCH including the HARQ-ACK is received, the HARQ-ACK is transmitted to the control section 301. In addition, the received signal processing section 304 transmits the received signal and / or the signal subjected to reception processing to the measurement section 305.

[109] Measurement section 305 performs the measurement for the received signal. Measurement section 305 may include a meter, a measurement circuit, or a measuring device, as explained based on common knowledge. Petition 870200060015, dated 05 / 14 / 2020, page 89 / 177 27 / 46 in the technical field to which the present invention relates.

[110] For example, measurement section 305 can perform radio resource management (RRM) measurement, channel status information (CSI) measurement, or similar measurements based on the received signal. Measurement section 305 can measure received power (such as received reference signal power (RSRP)), received quality (such as received reference signal quality (RSRQ) and signal-to-noise ratio (SINR)), signal strength (such as received signal strength indicator (RSSI)), transmission path information (such as CSI), or similar measurements. The measurement result can be sent to control section 301.

[111] Control section 301 can determine the allocation by having a range based on the number or maximum number of downlink control channel candidates for downlink control channel candidates (such as PDCCH candidates) for a specific aggregation level in the control feature set. User terminal

[112] Figure 7 is a diagram illustrating an example of a complete user terminal configuration according to an embodiment of the invention. The user terminal 20 includes a plurality of transmit / receive antennas 201, an amplification section 202, a transmit / receive section 203, a baseband signal processing section 204 and an application section 205. Note that one or more transmit / receive antennas 201, one or more amplification sections 202 and one or more transmit / receive sections 203 may be provided.

[113] A radio frequency signal received through the transmit / receive antenna 201 is amplified by the amplification section 202. The transmit / receive section 203 receives the amplified downlink signal. Petition 870200060015, dated 05 / 14 / 2020, pp. 90 / 177 28 / 46 by amplification section 202. The transmission / reception section 203 converts the frequency of the received signal into a baseband signal and transmits the baseband signal to the baseband signal processing section 204. The transmission / reception section 203 may include a transmitter / receiver, a transmission / reception circuit, or a transmission / reception apparatus, as explained based on common knowledge in the technical field to which the present invention relates. Note that the transmission / reception section 203 may include an integrated transmission / reception section or may separately include a transmission section and a reception section.

[114] The baseband signal processing section 204 performs reception processing, such as FFT processing, error correction decoding, retransmission control for the incoming baseband signal or similar. Downlink user data is transmitted to application section 205. Application section 205 performs processing for layers higher than the physical layer and the MAC layer, and similar. In addition, from the downlink data, broadcast information can be transmitted to application section 205.

[115] Meanwhile, uplink user data is introduced from application section 205 to baseband signal processing section 204. Baseband signal processing section 204 performs relay control transmission processing (such as HARQ transmission processing), channel coding, pre-coding, discrete Fourier transform (DFT) processing, IFFT processing or similar and transmits the resulting signal to transmit / receive section 203. Transmit / receive section 203 converts the baseband signal output from baseband signal processing section 204 into a radio frequency band and transmits the radio frequency signal. The Petition 870200060015, dated 05 / 14 / 2020, page 91 / 177 29 / 46 radio frequency signal converted by the transmit / receive section 203 is amplified by the amplification section 202 and is transmitted from the transmit / receive antenna 201.

[116] The transmit / receive section 203 can receive a downlink control channel (such as PDCCH) for the control resource set.

[117] Figure 8 is a diagram illustrating an example of a functional configuration of the user terminal according to an embodiment of the invention. Note that although the functional blocks of the characteristic parts according to this embodiment are mainly illustrated, the user terminal 20 may include other functional blocks necessary for radio communication.

[118] The baseband signal processing section 204 of the user terminal 20 includes at least one control section 401, one transmission signal generation section 402, one mapping section 403, one received signal processing section 404 and one measurement section 405. Note that some or all of these components may not be included in the baseband signal processing section 204, provided they are included in the user terminal 20.

[119] Control section 401 controls the user terminal 20 as a whole. Control section 401 may include a controller, a control circuit or a control apparatus, as explained based on common knowledge in the technical field to which the present invention relates.

[120] Control section 401 controls, for example, signal generation using transmission signal generation section 402, signal allocation using mapping section 403 and the like. In addition, control section 401 controls reception processing from received signal processing section 404, signal measurement using measurement section 405 and the like. Petition 870200060015, dated 05 / 14 / 2020, page 92 / 177 30 / 46

[121] Control section 401 acquires the downlink control signal and the downlink data signal transmitted from base radio station 10 from the received signal processing section 404. Control section 401 controls the generation of the uplink control signal and / or the uplink data signal based on a result of determining whether or not retransmission control is required for the downlink control signal and / or the downlink data signal, or similar.

[122] When several pieces of information reported from base radio station 10 are acquired from the received signal processing section 404, the control section 401 can update a parameter used in the control based on this information.

[123] The transmission signal generation section 402 generates an uplink signal (such as an uplink control signal, an uplink data signal, and an uplink reference signal) based on an instruction from the control section 401 and transmits the uplink signal to the mapping section 403. The transmission signal generation section 402 may include a signal generator, a signal generation circuit, or a signal generation apparatus, as explained based on common knowledge in the technical field to which the present invention relates.

[124] The 402 transmission signal generation section generates the uplink control signal in relation to transmission acknowledgment information, channel status information (CSI) or similar, for example, based on an instruction from the 401 control section. In addition, the 402 transmission signal generation section generates the uplink data signal based on an instruction from the 401 control section. By Petition 870200060015, dated 05 / 14 / 2020, page 93 / 177 31 / 46 example, the transmission signal generation section 402 is instructed to generate the uplink data signal from the control section 401 when the downlink control signal notified from base radio station 10 includes the UL grant.

[125] Mapping section 403 maps the uplink signal generated by the transmission signal generation section 402 to a radio resource based on the instruction from control section 401 and sends it to transmission / reception section 203. Mapping section 403 may include a mapper, a mapping circuit, or a mapping apparatus, as explained based on common knowledge in the technical field to which the present invention relates.

[126] The received signal processing section 404 performs reception processing (such as demapping, demodulation, and decoding) for the received signal input from the transmit / receive section 203. Here, the received signal includes a downlink signal (such as a downlink control signal, a downlink data signal, and a downlink reference signal) transmitted from the base radio station 10. The received signal processing section 404 may include a signal processor, a signal processing circuit, or a signal processing apparatus, as explained based on common knowledge in the technical field to which the present invention relates. Furthermore, the received signal processing section 404 may be configured as a reception section according to the present invention.

[127] The received signal processing section 404 transmits the information decoded through the reception processing to the control section 401. The received signal processing section 404 transmits, by Petition 870200060015, dated 05 / 14 / 2020, page 94 / 177 32 / 46 example, broadcast information, system information, RRC, DCI or similar signaling to control section 401. In addition, the received signal processing section 404 transmits the received signal and / or the signal subjected to reception processing to the measurement section 405.

[128] Measurement section 405 performs the measurement for the received signal. Measurement section 405 may include a meter, a measurement circuit, or a measuring apparatus, as explained based on common knowledge in the technical field to which the present invention relates.

[129] For example, measurement section 405 can perform RRM measurement, CSI measurement or similar based on the received signal. Measurement section 405 can measure received power (such as RSRP), received quality (such as RSRQ and SINR), signal strength (such as RSSI), transmission path information (such as CSI) or similar. The measurement result can be sent to control section 401.

[130] Control section 401 can determine the allocation by having a range based on the number or maximum number of downlink control channel candidates for downlink control channel candidates (such as PDCCH candidates) for a specific aggregation level in the control resource set.

[131] The interval may be inversely proportional to the number of candidates for the downlink control channel. Furthermore, the number of candidates for the downlink control channel may be given by upper-layer signaling (such as RRC signaling) (first mode).

[132] The interval may be inversely proportional to the maximum number of candidates for the downlink control channel. Furthermore, the maximum number of candidates for the downlink control channel Petition 870200060015, dated 05 / 14 / 2020, page 95 / 177 33 / 46 can be defined based on the specification or system information (such as RMSI) (second modality). Hardware Configuration

[133] Note that the block diagrams used in the description of the embodiments mentioned above illustrate blocks in the function unit. These functional blocks (components) are implemented by combining bitwise hardware and / or software. Furthermore, the method of implementation of each functional block is not particularly limited. That is, each functional block can be implemented using a single device combined physically and / or logically or using a plurality of devices, connecting directly and / or indirectly two or more physically and / or logically separate devices (for example, in a wired and / or wireless manner).

[134] For example, the base radio station and the user terminal according to an embodiment of the present invention may function as a computer that performs the processing of the radio communication method of the present invention. Figure 9 is a diagram illustrating examples of hardware configurations of the base radio station and the user terminal according to an embodiment of the present invention. The aforementioned base radio station 10 and user terminal 20 may physically include a computer apparatus with a processor 1001, a memory 1002, a storage 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007 or similar.

[135] Note that in the following description, the word apparatus may be replaced by circuit, device, unit or similar. The hardware configurations of base radio station 10 and user terminal 20 may include one or a plurality of apparatus illustrated in the drawings or Petition 870200060015, dated 05 / 14 / 2020, pp. 96 / 177 34 / 46 may not include some of the devices.

[136] For example, although only one 1001 processor is illustrated, a plurality of processors may also be provided. Furthermore, processing may be performed by a single processor or may be performed by one or more processors simultaneously, sequentially, or using other methods. Note that the 1001 processor may be embedded in one or more chips.

[137] Each function of the base radio station 10 and the user terminal 20 is implemented by reading software (program) data into the processor hardware 1001, memory 1002 or similar, performing the operation using the processor 1001 and controlling communication through the communication device 1004 and reading and / or writing data from memory 1002 and storage 1003.

[138] For example, processor 1001 controls the computer as a whole, operating an operating system. Processor 1001 may also include a central processing unit (CPU) having an interface with a peripheral device, a control device, an operating device, a register and the like. For example, the baseband signal processing section mentioned 104 (204), the call processing section 105 or the like may be implemented by processor 1001.

[139] Processor 1001 reads programs (program codes), software modules, data or similar from storage 1003 and / or communication device 1004 into memory 1002 and uses them as a basis for performing various processing operations. The program causes a computer to perform at least some of the operations described in the aforementioned modes. For example, the control section 401 of the user terminal 20 can be implemented by a control program. Petition 870200060015, dated 05 / 14 / 2020, pp. 97 / 177 35 / 46 stored in memory 1002 and operated on processor 1001, or it can be implemented by other functional blocks in a similar way.

[140] Memory 1002 is a computer-readable recoding medium and, for example, may include at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically e-EPROM (EEPROM), a random access memory (RAM) or other suitable storage medium. Memory 1002 may also be referred to as a register, “cache”, “main memory (main storage device)” or the like. Memory 1002 may store programs (program codes), software modules and the like to implement the radio communication method according to an embodiment of the invention.

[141] Storage 1003 is a computer-readable recording medium and may include at least one of a floppy disk, a floppy disk (trademark), a magnetic optical disc (such as a compact disc ROM (CD-ROM), a general-purpose digital disc and a Blu-ray disc (trademark)), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick and a key drive), a magnetic stripe, a database, a server or other suitable storage media. Storage 1003 may also be referred to as an auxiliary storage device.

[142] The 1004 communication device is a hardware (transmission / reception device) for enabling communication between computers via wired and / or wireless networks and may also be referred to as a network device, network controller, network card, communication module or similar. The 1004 communication device may also include a high-frequency switch, a duplexer, a filter, a frequency synthesizer or Petition 870200060015, dated 05 / 14 / 2020, pp. 98 / 177 36 / 46 similar, in order to implement, for example, frequency division duplexing (FDD) and / or time division duplexing (TDD). For example, the transmit / receive antenna 101 (or 201), the amplification section 102 (or 202), the transmit / receive section 103 (or 203), the communication path interface 106 and the like described above can be implemented by the communication apparatus 1004.

[143] Input device 1005 is an input device that receives an input from outside (such as a keyboard, a mouse, a microphone, a switch, a button, and a sensor). Output device 1006 is an output device (such as a display, a loudspeaker, and a light-emitting diode lamp) for emitting information to the outside. Note that input device 1005 and output device 1006 can be integrated with each other (for example, a touch panel).

[144] Various devices, such as processor 1001 and memory 1002, are connected via a bus 1007 for information communication. Bus 1007 may include a single bus, or different buses may be used for each device.

[145] Base radio station 10 and user terminal 20 may include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field-programmable gate array (FPGA). In addition, the hardware may be used to implement some or all of the functional blocks. For example, processor 1001 may be embedded with at least one of these hardware units. Modifications

[146] Note that the technical terminology discussed here and / or technical terminology necessary for understanding this report Petition 870200060015, dated 05 / 14 / 2020, page 99 / 177 37 / 46 descriptive terms may be replaced by other technical terminologies with equal or similar meanings. For example, channels and / or symbols may be replaced by signals (signaling). Furthermore, signals may be replaced by messages. Additionally, the reference signal may be abbreviated to RS and may also be referred to as pilot, pilot signal, or similar, depending on the standard applied. Furthermore, the component carrier (CC) may also be referred to as cell, frequency carrier, frequency carrier, or similar.

[147] The radio frame may include one or more periods (frames) in the time domain. The one or a plurality of periods (frames) of the radio frame may also be called a subframe. In addition, the subframe may include one or more slots in the time domain. Furthermore, the subframe may have a fixed time period (e.g., 1 ms), regardless of numerology.

[148] The slot may include one or more symbols (such as orthogonal frequency division multiplexing (OFDM) symbols or single-carrier frequency division multiple access (SC-FDMA) symbols) in the time domain. In addition, the slot may be a unit of time based on numerology. Furthermore, the slot may include a plurality of mini-slots. Each mini-slot may include one or more symbols in the time domain. In addition, the mini-slot may also be called a sub-slot.

[149] Every radio frame, subframe, slot, mini-slot, and symbol represents a unit of time for signal transmission. Each of the radio frames, subframe, slot, mini-slot, and symbol may be called by different names. For example, a subframe may be referred to as a transmission time interval (TTI), or a plurality of continuous subframes may be called a TTI. In addition, a slot or a mini-slot may Petition 870200060015, dated 05 / 14 / 2020, pp. 100 / 177 38 / 46 can be called TTI. That is, the subframe and / or TTI can be a subframe (1 ms) in existing LTE, it can be smaller than 1 ms (e.g., 1 to 13 symbols) or it can be larger than 1 ms. Note that the TTI unit may also be called a slot, mini slot, or similar, instead of subframe.

[150] Here, TTI refers to a minimum time unit for scheduling in radiocommunication. For example, in the LTE system, scheduling is performed so that the base radio station allocates radio resources (such as frequency bandwidth and available transmission power to each user terminal) to each user terminal on a TTI basis. The definition of TTI is not limited to this.

[151] The TTI can be a time unit for transmitting channel-encoded data packets (transport blocks), code blocks and / or code words, or it can be a unit for scheduling, link adaptation or similar processing. Note that when the TTI is provided, a time interval (e.g., the number of symbols) during which transport blocks, code blocks and / or code words are mapped may in practice be shorter than the TTI.

[152] Note that when a slot or a mini slot is referred to as “TTI”, one or more TTIs (i.e., one or more slots or one or more mini slots) can be the minimum time unit of the scheduling. In addition, the number of slots (mini slots) included in the minimum time unit of the scheduling can also be controlled.

[153] The TTI with a time period of 1 ms” may also be referred to as typical TTI (TTI of LTE Rel. 8 to 12), normal TTI”, long TTI”, typical subframe”, normal subframe”, long subframe” or something similar. The TTI shorter than the typical TTI may also be called reduced TTI”, short TTI”, partial TTI”, fractional TTI”, reduced subframe”, Petition 870200060015, dated 05 / 14 / 2020, pp. 101 / 177 39 / 46 “short subframe”, “mini slot”, “sub-slot” or something similar.

[154] Note that the long TTI (like the typical TTI or subframe) may also be called “TTI with a duration greater than 1 ms”, and the short TTI (like the reduced TTI) may also be called “TTI having a TTI length less than that of the long TTI and with a length of 1 ms or more”.

[155] A resource block (RB) is a unit of resource allocation in the time domain and frequency domain and may include one or more continuous subcarriers in the frequency domain. In addition, the RB may include one or more symbols in the time domain and may be a slot, a mini slot, a subframe, or a TTI length. A TTI and a subframe may include one or more resource blocks. The one or plurality of RBs may also be referred to as “physical resource block (PRB)”, “subcarrier group (SCG)”, “resource element group (REG)”, “PRB pair”, “RB pair”, or similar.

[156] The feature block may include one or a plurality of feature elements (REs). For example, an ER may include a radio feature region for a subcarrier and a symbol.

[157] The radio frame, subframe, slot, mini slot, symbol and similar structures described above are merely given by way of example. For example, the number of subframes included in a radio frame, the number of slots included in a subframe or radio frame, the number of mini slots included in a slot, the number of symbols and RBs included in a slot or mini slot, the number of subcarriers included in an RB, the number of symbols in a TTI, a symbol length, a cyclic prefix (CP) length and similar can change in various ways.

[158] The information, parameters or similar discussed here may be Petition 870200060015, dated 05 / 14 / 2020, pp. 102 / 177 40 / 46 expressed as absolute values ​​or as relative values ​​in relation to a given value, or they can be expressed as other corresponding information. For example, the radio feature can be indicated by a specific index.

[159] The names used for the parameters contained herein should not be interpreted in a limiting sense. For example, as all the various channels (such as the uplink physical control channel (PUCCH) and the downlink physical control channel (PDCCH)) and information factors can be identified using appropriate names, various names assigned to various channels and information factors should not be interpreted in a limiting sense at any point.

[160] The information, signals or similar discussed herein may be expressed as any of several different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips or similar described throughout the above description may be expressed as voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[161] Information, signals or similar may be transmitted from the upper layer to the lower layer and / or from the lower layer to the upper layer. Information, signals or similar may be received / sent through a plurality of network nodes.

[162] Input / output information, signals, or similar items can be stored in a specific location (such as memory) or managed using a management table. Input / output information, signals, or similar items can be overwritten, updated, or added. Information, signals, or similar items that have been emitted can be deleted. As Petition 870200060015, dated 05 / 14 / 2020, pp. 103 / 177 41 / 46 Input information, signals or similar may be transmitted to other devices.

[163] Information notification may be performed using other methods without limiting the aspects / modalities described in this document. For example, information notification may be performed using physical layer signaling (such as downlink control information (DCI) and uplink control information (UCI)), upper layer signaling (such as radio resource control (RRC) signaling), broadcast information (such as master information block (MIB) and system information block (SIB)), medium access control (MAC) signaling), other signals, or any combination thereof.

[164] Note that physical layer signaling may also be referred to as L1 / L2 control information (Layer 1 / Layer 2) (L1 / L2 control signal)”, L1 control information (L1 control signal)” or similar. In addition, RRC signaling may also be referred to as RRC message”, for example, RRC connection definition message”, RRC connection reconfiguration message” or similar. Furthermore, MAC signaling may be notified, for example, using a MAC control element (MAC CE).

[165] Notification of certain information (e.g., notification of X”) can be carried out implicitly (e.g., without performing notification of the information provided or notifying other information) without limiting explicit notification.

[166] The determination can be performed using a value expressed in a bit (0” or 1”), it can be performed using a Boolean value expressed in true” or false”, or it can be performed by comparing numerical values ​​(for example, comparison with a given value). Petition 870200060015, dated 05 / 14 / 2020, pp. 104 / 177 42 / 46

[167] It is natural to interpret “software” broadly to include an instruction, a set of instructions, a code, a code segment, a program code, a program, a subprogram, a software module, an application, a software application, a software package, a routine, a subroutine, an object, an executable file, an execution queue, a procedure, a function and the like, regardless of whether the software is referred to as software, firmware, middleware, microcode, hardware description language or other names.

[168] Software, instructions, information or similar may be transmitted or received through a transmission medium. For example, when software is transmitted from a website, server or other remote source in a wired manner (such as a coaxial cable, a fiber optic cable, a twisted pair and a digital subscriber line (DSL)) and / or in a wireless manner (such as infrared and microwave), these wired and wireless technologies are also incorporated into the definition of the transmission medium.

[169] The words system and network, as used here, are interchangeable.

[170] Here, the words base station (BS), base radio station, eNB, gNB, cell, sector, cell group, carrier and component carrier may be interchangeable. In some cases, the base station is also called fixed station, NodeB, eNodeB (eNB), access point, transmit point, receive point, femto cell, small cell or something similar.

[171] A base station can accommodate one or more (for example, three) cells (also called sectors). If the base station accommodates a plurality of cells, the entire coverage area of ​​the base station can be segmented into multiple smaller areas and the respective smaller areas can Petition 870200060015, dated 05 / 14 / 2020, pp. 105 / 177 43 / 46 provide communication services with a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The word cell or sector refers to a part or all of the base station's coverage area and / or the base station subsystem that provides communication services within that coverage.

[172] Here, the terms mobile station (MS), user terminal, user equipment (UE), and terminal may be interchangeable. The base station may also be referred to as fixed station, NodeB, eNodeB (eNB), access point, transmit point, receive point, femto cell, small cell, and the like.

[173] In some cases, the mobile station may be referred to by those skilled in the art as subscriber station, mobile unit, subscriber unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, subscriber mobile station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client or any other appropriate terminology.

[174] The base radio station here may also be referred to as the user terminal. For example, the aspects / modalities mentioned above may be applied to a case where communication between the base radio station and the user terminal is replaced by communication between a plurality of user terminals (D2D: Device to Device). In this case, the aforementioned functions provided in base radio station 10 may be included in the configuration of user terminal 20. Furthermore, the terms uplink and downlink may also be referred to as side links. For example, the uplink channel may also be referred to as the side channel. Petition 870200060015, dated 05 / 14 / 2020, pp. 106 / 177 44 / 46

[175] Similarly, the “user terminal” in this document may also be referred to as “base radio station”. In this case, the functions mentioned above provided in user terminal 20 may be included in base radio station 10.

[176] The operations performed by the base station as described herein may be performed by its superior node in some cases. In a network that includes one or a plurality of network nodes with base stations, it is apparent that various operations performed to communicate with a terminal may be performed by a base station, one or more network nodes that are different from the base station (such as “mobility management entity (MME)” or “server gateway (S-GW)”, but not limited to these), or a combination thereof.

[177] Each of the aspects / modalities described in this document can be used alone, in combination, or interchangeably after execution. Furthermore, the processing procedures, sequences, flowcharts, and similar aspects / modalities described in this document can be executed in different orders, provided that consistency can be ensured. For example, the method described here presents elements from various steps in an exemplary order, without being limited to a specific order.

[178] Each of the aspects / modalities described here is applicable to systems based on 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 Broadband Mobile), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX). Petition 870200060015, dated 05 / 14 / 2020, pp. 107 / 177 45 / 46 (registered trademark)), IEEE 802.20, UWB (Ultra Wideband) or Bluetooth (registered trademark), a system based on any other suitable radiocommunication method and / or an enhanced next-generation system based on them.

[179] The phrase “based on ~” (or “based on ~”), as used here, does not mean “only based on”, unless otherwise specified. In other words, the phrase “based on” means both “only based on” and “at least based on”.

[180] Any reference to elements using terminology such as “first”, “second”, and so forth, as used herein, does not limit the quantity or order of such elements in general. Such terminology may be used herein in ways convenient for distinguishing between two or more elements. Therefore, reference to the first and second elements does not mean that only those two elements are used, or that the first element must precede the second element in any way.

[181] In some cases, the word “determine or decide (determine)”, as used here, may include several types of operations. For example, “determine or decide” may be considered “determine or decide” in calculation, computation, processing, derivation, investigation, research (such as searching a table, database, or other data structure), or verification. Furthermore, “determine or decide” may be considered as “determine or decide” in reception (such as receiving information), transmission (such as transmitting information), input, output, access (such as accessing data in memory), or similar. In addition, “determine or decide” may be considered as “determine or decide” in resolution, selection, choice, establishment, comparison, or similar. That is, “determine or decide” may be considered as “determine or decide” some operation. Petition 870200060015, dated 05 / 14 / 2020, pp. 108 / 177 46 / 46

[182] The word “connected or coupled” or any variation thereof, as used herein, means all possible direct or indirect connections or couplings between two or more elements and may include the existence of one or more intermediate elements between two mutually “connected” or “coupled” elements. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, the word “connection” may be replaced by “access”.

[183] ​​As used in this document, two elements may be considered mutually “connected” or “coupled” using one or more electrical wires, cables and / or printed electrical interconnects and as various non-limiting and non-comprehensive examples, using electromagnetic energy with a wavelength of a radio frequency domain, a microwave domain and / or an optical domain (visible and invisible), or similar.

[184] As used here, the phrase “A and B are different” can mean “A and B are different from each other”. This interpretation can also apply to the words “separate”, “combined” and similar words.

[185] In the event that the word “including”, “comprising” or any variation thereof is used in this descriptive report or claims, such word shall be “inclusive”, as in the word “have”. Furthermore, the word “or”, as used in this descriptive report or claims, is not intended to mean “OR exclusive”.

[186] Although the present invention has been described in detail above, it is evident to those skilled in the art that the invention is not limited to the embodiments described herein. Various modifications and alterations may be possible without departing from the spirit and scope of the present invention as defined in the claims. Therefore, the description is given for illustrative purposes only and is not intended in any way to limit the present invention. Petition 870200060015, dated 05 / 14 / 2020, pp. 109 / 177

Claims

1 / 3 CLAIMS 1. Terminal (20) configured to be operable in the mobile communication system, in accordance with the 3GPP standard, characterized in that it comprises: a control section (401) that determines control resource element indices, CCE, for a plurality of physical downlink control channel candidates, PDCCH, for aggregation level L of a search space for a server cell corresponding to carrier indicator field value, CIF, n of CIF values ​​configured for aggregation level L;and a receiving section (203) that monitors the plurality of PDCCH candidates within a control resource set, CORESET, where the CCE indices are given by the following formula: L · {Y + ^-] + ri) mod [-]} + i, Ll-mJ j LlJj m corresponds to one among the plurality of PDCCH candidates, M is the maximum number of PDCCH candidates for the CIF values, N is the number of CCEs in the CORESET, Y is based on the temporary radio network ID value, RNTI, ei = 0, ..., L-1.; 2. Terminal (20), according to claim 1, characterized in that the search space is specific to terminal (20).

3. Radio communication method for a terminal (20) configured to be operable in the mobile communication system, according to the 3GPP standard, characterized in that it comprises: determining control resource element indices, CCE, for a plurality of physical downlink control channel candidates, PDCCH, for aggregation level L of a search space for a cell Petition 870240099582, of 11 / 22 / 2024, p.14 / 16 2 / 3 server corresponding to carrier indicator field value, CIF, n of CIF values ​​configured for aggregation level L; and monitor the plurality of PDCCH candidates within a control resource set, CORESET, where the CCE indices are given by the following formula: L · ÍY + í^-^1 + rí) mod í-1} + i, 1 Ll-mJ 7 LlJj m corresponds to one among the plurality of PDCCH candidates, M is the maximum number of PDCCH candidates for the CIF values, N is the number of CCEs in the CORESET, Y is based on the temporary radio network ID value, RNTI, ei = 0, ..., L-1.

4. Base station (10) configured to be operable in the mobile communication system, according to the 3GPP standard, characterized in that it comprises: a control section (301) that determines control resource element indices, CCE, for a plurality of physical downlink control channel candidates, PDCCH, for aggregation level L of a search space for a server cell corresponding to carrier indicator field value, CIF, n of CIF values ​​configured for aggregation level L; and a transmission section (103) that transmits PDCCH from the plurality of PDCCH candidates within a control resource set, CORESET, wherein the CCE indices are given by the following formula: L · {Y + mW .LM. + rí) mod ^} + i , m corresponds to one among the plurality of PDCCH candidates, M is the maximum number of PDCCH candidates for the CIF values, N is the number of CCEs in CORESET, Petition 870240099582, dated 11 / 22 / 2024, page.15 / 16 3 / 3 Y is based on the temporary radio network ID value, RNTI, ei = 0, ..., L-1. Petition 870240099582, dated 11 / 22 / 2024, page 16 / 16.

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