RU2794527C2 - Terminal and radio communication method - Google Patents

Abstract

FIELD: communications.

SUBSTANCE: to this end, the terminal comprises: a control module configured to determine a spatial reception parameter of a control channel based on QCL information about a synchronization signal or a reference signal; and a receiving module configured to receive a control channel based on said determined spatial receive parameter, wherein if beam failure recovery (BFR) is performed using a contention-based random access procedure, then the control module, as a QCL parameter for monitoring the downlink control channel in the search space, uses the QCL parameter associated with the synchronization signal block (SSB) found in the specified random access procedure with the possibility of collision to select the random access preamble.

EFFECT: effective configuration of the quasi co-location (QCL) parameter during the backup transition to the procedure of contention-based random access (CBRA).

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Description

The field of technology to which the invention belongs

The present invention relates to a terminal and a communication method in a radio communication system.

State of the art

For a new radio system (New Radio, NR, also referred to as "5G"), which is the successor of the Long Term Evolution (LTE) system, a technology has been developed (see, for example, Non-Patent Document 1) that can satisfy requirements such as high system capacity, high data rate, low latency, simultaneous connection of multiple terminals, low cost, energy efficiency.

The NR system uses a higher frequency band than the LTE system. Since the radio wave propagation loss increases in the high frequency band, increasing the received power by forming a narrow beam for radio signal transmission is studied to compensate for it (for example, see Non-Patent Document 2).

Prior Art Documents

[Non-Patent Documents]

Non-Patent Document 1: 3GPPTS 38.300 V15.3.0 (2018-09).

Non-Patent Document 2: 3GPPTS 38.211 V15.3.0 (2018-09).

Non-Patent Document 3: 3GPP TSG-RAN WG2 Meeting #105, R2-1901255, Athens, Greece, 25 Feb-01 Mar 2019.

Non-Patent Document 4: 3GPP TSG-RAN WG2 Meeting #105, R2-1901256, Athens, Greece, 25 Feb-01 Mar 2019.

Non-Patent Document 5: 3GPPTS 38.321 V15.3.0 (2018-09).

Disclosure of the essence of the invention

[Disadvantage eliminated by the invention]

Beam Failure Recovery (BFR) is performed by the terminal based on a Contention Free Random Access (CFRA) procedure. However, if the beamFailureRecoveryTimer expires during this operation, then the terminal proceeds to use the BFR fallback operation based on Contention-Based Random Access procedure (CBRA). When a terminal performs BFR using CBRA, the base station does not distinguish whether the terminal performs CBRA with a BFR purpose or another purpose. To address this shortcoming, it has been proposed to adopt separate Synchronization Signal Block (SSB) selection rules for CBRA for BFR and other purposes.

There is a need for a method for efficiently configuring a QCL parameter during fallback to CBRA.

[Fix]

According to an aspect of the present invention, a terminal is provided, comprising a control module configured to determine a spatial reception parameter of a control channel based on QCL information about a synchronization signal or a reference signal; and a receiving module configured to receive a control channel based on said determined spatial receive parameter, wherein if beam failure recovery (BFR) is performed using a collision-capable random access procedure, the control module, as a QCL parameter for monitoring the downlink control in the search space uses the QCL parameter associated with the synchronization signal block (SSB) found in the specified random access procedure with the possibility of conflict to select the random access preamble.

[Advantage of the invention]

According to an implementation of the present invention, a method for efficiently setting the QCL parameter is provided.

Brief description of the drawings

Fig. 1 is a diagram of a radio communication system according to an implementation of the present invention.

Fig. 2 is a diagram of an example in which a TCI state is configured according to an implementation of the present invention.

Fig. 3 is a block diagram of an example (1) of monitoring a control signal according to an implementation of the present invention.

Fig. 4 is a block diagram of an example (2) of monitoring a control signal according to an implementation of the present invention.

Fig. 5 is an example of a functional diagram of a base station according to an implementation of the present invention.

6 is an example of a functional diagram of a terminal according to an implementation of the present invention.

Fig. 7 shows an example of a hardware configuration of a base station and a terminal according to an implementation of the present invention.

[Implementation of the invention]

Next, with reference to the drawings, implementations of the present invention will be described. It should be appreciated that the implementations described below are examples, and the implementations to which the present invention is applicable are not limited to these implementations.

Known technology is used to operate the radio communication system according to embodiments of the present invention where required. Such known technology is, for example, LTE technology. However, this known technology is not limited to LTE technology. The term "1_TE" in this document should, unless otherwise indicated, be understood in a broad sense, including the advanced system of LTE (LTE-Advanced) and later systems (for example, NR or 5G).

In the implementations of the present invention described below, terms from the existing LTE are used, for example, “synchronization signal” (English Synchronization Signal, SS), “primary synchronization signal” (English Primary SS, PSS), “secondary synchronization signal” (English Secondary SS, SSS), "Physical Broadcast Channel" (Physical Broadcast Channel, RVSN) and "Physical Random Access Channel" (Physical Random Access Channel, PRACH). This is for convenience of description, but signals and functional modules like these may be referred to by other names. In NR, the above terms correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, and the like. However, even if a signal is used in NR, its designation does not always begin with "NR-".

In implementations of the present invention, the duplex method can be Time Division Duplex (TDD), Frequency Division Duplex (FDD), or any other method (for example, flexible duplex or t .P.).

In the following description, the method for transmitting signals using a transmission beam may be digital beamforming, in which a signal multiplied by a precoding vector (a signal precoded using a precoding vector) is transmitted, or it may be analog beamforming, in which a beam is formed with using an adjustable phase shifter in a radio frequency circuit (RF circuit). Similarly, the method of receiving a signal using a receive beam can be digital beamforming, in which the received signal is multiplied by a predetermined weight vector, or analog beamforming, implemented using an adjustable phase shifter in the RF circuit. The transmission and/or reception may also use hybrid beamforming, which combines digital beamforming and analog beamforming. Signal transmission using a transmission beam may be signal transmission using a particular antenna port. Similarly, receiving a signal using a receive beam may be receiving a signal using a particular antenna port. An antenna port refers to a logical antenna port or a physical antenna port defined by the 3GPP standard. The above-described precoding or beamforming may be referred to as precoding, spatial domain filtering, or the like.

Note that the method of forming the transmission beam and the reception beam by the above-described methods is not limited. For example, in a multi-antenna base station 10 or terminal 20, a method of changing the angle of each antenna may be used; a precoding vector method and an antenna angle method; method with switching antenna panels; a method of combining a plurality of antenna panels; other methods may be used. For example, a plurality of mutually distinct transmission paths may be used in the high frequency band. The use of a plurality of transmission paths is referred to as a multipath mode, and the use of a single transmission path is referred to as a single path mode.

In implementations of the present invention, "configuring a radio parameter" or the like. may be called presetting a predetermined value or setting a radio parameter to a value reported from the base station 10 or from the terminal 20.

Fig. 1 is a diagram of a radio communication system according to an implementation of the present invention. The radio communication system in the implementation of the present invention contains, as shown in Fig.1, a base station 10 and a terminal 20. In Fig.1, one base station 10 and one terminal 20 are shown. However, this is only an example, and each of these devices may be more than one .

The base station 10 is a communication device configured to form one or more cells and perform wireless communication with the terminal 20. The physical resource of the radio signal is given in the time domain and in the frequency domain; the resource in the time domain may be given by the number of symbols of the Orthogonal Frequency Division Multiplexing (OFDM) scheme, and in the frequency domain may be given by the number of subcarriers or the number of resource blocks. The base station 10 is configured to transmit to the terminal 20 a synchronization signal and system information. The synchronization signal is, for example, NR-PSS and NR-SSS. Part of the system information is transmitted, for example, in the NR-PBCH channel, which is also called broadcast information. The synchronization signal and broadcast information may be transmitted periodically as a synchronization signal block (SS/PBCH block) consisting of a predetermined number of OFDM symbols. For example, base station 10 is configured to transmit a downlink control or data signal to terminal 20 and to receive an uplink control or data signal from terminal 20. Base station 10 and terminal 20 are configured to transmit and receive signals using shaping. beam. For example, as shown in figure 1, the reference signal transmitted from the base station 10 contains a reference signal information about the state of the channel (English Channel State Information Reference Signal, CSI-RS), and the number of channels transmitted from the base station 10, includes a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH).

The terminal 20 is a communication device, such as a smartphone, a mobile phone, a tablet, a handheld terminal, or a communication module for machine-to-machine (M2M) communication, containing the radio communication functional module. Terminal 20 is configured to use a variety of communication services provided by the radio communication system by receiving control or data signals from base station 10 on the downlink and transmitting control or data signals to base station 10 on the uplink. For example, as shown in FIG. 1, the channels transmitted from terminal 20 include a Physical Uplink Control Channel (PUCCH) and a Physical Uplink Shared Channel (PUSCH).

In NR, an antenna port is defined such that a channel carrying a symbol on an antenna port can be determined from a channel carrying another symbol on the same antenna port. Two antenna ports are quasi co-located (QCL) when, for example, the characteristics of the radio wave propagation path (which include delay distribution, Doppler broadening, Doppler shift, average gain, average delay, spatial receive parameter, or t .p.) for one antenna port can be used to evaluate the characteristics of the radio wave path for another antenna port. More specifically, if two antenna ports are quasi-co-located, then the large-scale characteristics (delay distribution, Doppler spread, Doppler shift, average gain, average delay, receive spatial parameter, or the like) of the radio channels corresponding to the two antennas can be considered equivalent.

Several types of QCL are defined. Type A QCL refers to Doppler shift, Doppler broadening, average delay, and rate of change of delay. Type B QCL refers to Doppler shift and Doppler broadening. Type C QCL refers to Doppler shift and average delay. Type D QCL refers to the receive spatial parameter.

Here, for example, when a certain block B and a certain CSI-RS are associated with a D type QCL, the terminal 20, assuming that the indicated block SS and CSI-RS are transmitted from the base station 10 using the same downlink beam, may receive these SS and CSI-RS use the same receive beamforming. In the following description, when the type of QCL is not explicitly specified, QCL is understood to mean one or more of QCL type A, QCL type B, QCL type C, or QCL type D.

Fig. 2 is a diagram of an example in which a TCI state is configured according to an implementation of the present invention. NR defines the state of the Transmission Configuration Indicator (TCI). The TCI state indicates a QCL relationship for the downlink reference signal, and one or more TCI states are included in Radio Resource Control (RRC) layer signaling to configure a Control Resource Set (CORESET) set. The specified downlink reference signal is an SS block or a CSI-RS signal. More specifically, by using a plurality of control resources, one of the TCI states is applied and a downlink reference signal corresponding to that TCI state is determined.

In step S1, the base station 10 transmits a PDCCH-Config signal to the terminal 20 via RRC signaling. The PDCCH-Config contains terminal 20 related information on how to receive the PDCCH and may be transmitted to terminal 20 as broadcast information or other RRC layer signaling. The PDCCH-Config contains information defining a set of control resources and information defining a search space.

In step S2, the terminal 20 determines the control resource set, search space, and TCI state to be used based on the PDCCH-Config received in step S1. In the search space determined in step S2, the terminal 20 monitors control information.

If information indicating that the TCI state is reported by DCI has been included in the PDCCH-Config, then in step S3, the base station 10 may dynamically report the TCI state to the terminal 20 by means of DCI, which is Physical Level (PHY) signaling. . The terminal 20 then changes its TCI state to the reported TCI state (S4). Steps S3 and S4 may not be performed.

In step S5, the base station 10 and the terminal 20 perform a random access procedure. Terminal 20 monitors control information using the SS block or CSI-RS selected for PRACH transmission as the QCL base. Steps S1-S4 and step S5 may be performed in any order. Initially, both steps S1-S4 and step S5 may be performed.

Meanwhile, the search space for monitoring the control signal is associated with a plurality of control resources. The relationship between the search space and the plurality of control resources is reported to the terminal 20 by RRC signaling to set the search space. Terminal 20 monitors the control signal corresponding to the specified set of control resources in the specified search space. If a plurality of TCI states are configured by RRC signaling, then the TCI state may be dynamically changed by downstream control information (DCI).

One of the search spaces is the ra-Search Space used in the random access procedure, i.e. a set of Common Search Spaces (CSS) of type 1 for the PDCCH. When monitoring a PDCCH message Msg2 or Msg4 and the corresponding PDSCH in the type 1 CSS set for the PDCCH, the intended QCL for the PDCCH request-initiated random access with no possibility of collision is the QCL with the SS or CSI-RS that was used to receive the specified PDCCH request.

For PDCCH request-initiated random access other than non-collision random access, when monitoring the PDCCH message Msg2 or Msg4 and the corresponding PDSCH in the Type 1 CSS set, the PDCCH uses QCL with the SS block or CSI-RS signal selected by the terminal 20 for PRACH transmission.

Another search space is Searchspace#0 for receiving the remaining minimum system information (English Remaining Minimum System Information, RMSI), containing system information necessary for communication; other system information (English Other System Information, OSI); call; or the like. For Searchspace #0, the monitoring timeslots of the SSs transmitted from the base station 10 are set. Thus, in Searchspace #0, unlike other search spaces, the monitoring timeslot depends on the intended SS.

Fig. 3 is a block diagram of an example (1) of monitoring a control signal according to an implementation of the present invention. Terminal 20 monitors Msg2 or Msg4 of the PDCCH in the Type 1 CSS set for the PDCCH. If the configuration of the PDCCH Type 3 CSS set or the UE Specific Search Space (USS) set is not received by the terminal 20, then the PDCCH Type 1 CSS set can continue to be used. More specifically, a type 1 CSS set is used to monitor the PDCCH until the terminal 20 receives an RRC reconfiguration message containing a type 3 CSS set configuration for the PDCCH or a USS set.

The cases in which the PDCCH Type 3 CSS Set or USS Set configuration may not be received by the terminal 20 include at least one of the following cases: the PDCCH Type 3 CSS Set or USS Set configuration is not received from the base station 10 after establishment. RRC connections; and the configuration of the type 3 CSS set for the PDCCH or the USS set is not received from the base station 10 after the start of random access. In addition, in the case where the configuration of the type 3 CSS set for the PDCCH or the USS set is not received from the base station 10 after the start of random access, the term "random access" includes at least one of the following cases: random access other than random access without the potential for conflict triggered by the PDCCH request; and all types of random access. Further, "the situation in which the configuration of the type 3 CSS set for PDCCH or the USS set is not received from the base station 10" corresponds to any of the above cases.

The above-described operation in the terminal 20 will be described with reference to the flowchart in FIG. 3 corresponding to random access without the possibility of collision.

In step S10, the terminal 20 transmits a random access preamble. Then, the terminal 20 starts monitoring the random access response window in the CSS type 1 set for the PDCCH (S11). The random access response is Msg2. Then, the terminal 20 receives the random access response (S12) and terminates the random access procedure (S13).

In step S14, the terminal 20 starts monitoring the PDCCH on the type 1 CSS set for the PDCCH. Here, there is a case in which no QCL guess is specified for monitoring by the terminal 20 in the type 1 CSS set for the PDCCH.

Accordingly, until an RRC reconfiguration message containing a configuration of a PDCCH type 3 CSS set or a USS set is received, the SS block or CSI-RS signal selected by the terminal 20 can always be taken as a QCL for monitoring the PDCCH type 1 CSS set, or, the QCL that was used in the time slot of receiving the PDCCH request can be taken as the QCL for monitoring the type 1 CSS set for the PDCCH. In addition, until an RRC reconfiguration message containing a PDCCH type 3 CSS set or USS set configuration is received, the TCI state set for the corresponding CORESET may be ignored.

As yet another example, until the TCI state of the corresponding CORESET is set for terminal 20, the SS block or CSI-RS signal selected by terminal 20 can be taken as a QCL for monitoring the corresponding search space, or as a QCL the QCL that was in use at the time the PDCCH request was received can be taken to monitor the corresponding search space.

In all of the above examples, for non-collision random access triggered by a PDCCH request, the QCL is assumed to be associated with that PDCCH request, and for collision-capable random access or random access other than non-collision random access triggered by a PDCCH request, e.g. handover access, a QCL relationship with the SS block or CSI-RS signal selected by the terminal 20 is assumed. PDCCH to initiate retransmissions Msg3; PDCCH following Msg 4 and corresponding PDSCH; and so on.

In step S15, an RRC reconfiguration message is received containing a type 3 CSS set configuration for the PDCCH or a USS set (S15); then, PDCCH monitoring is started on the PDCCH type 3 CSS set or USS set (S16).

Fig. 4 is a block diagram of an example (2) of monitoring a control signal according to an implementation of the present invention. For the block diagram in FIG. 4 corresponding to random access with the possibility of collision, the difference in the operation of the terminal 20 shown in FIG. 3 is described. Steps S20-S22 in Fig. 4 are the same as steps S10-S12 in Fig. 3. In addition, steps S27-S29 in Fig. 4 are the same as steps S14-S16 in Fig. 3.

Steps S23-S26 in FIG. 4 are different from those in FIG. 3. In step S23, the terminal 20 transmits Msg3. Terminal 20 then starts monitoring Msg4 on the PDCCH Type 1 CSS (S24). Then, the terminal 20 receives Msg4 (S25) and terminates the random access procedure (S26).

It is indicated here that if, after terminal 20 selects SSB or CSI-RS, for example, in the case of random access with the possibility of collision or handover, the PDCCH that the terminal 20 should monitor in the set of type 1 CSS for the PDCCH or the corresponding PDSCH overlaps with another PDCCH, and if that other PDCCH is not in a Type D QCL relationship with the specified SSB or CSI-RS, then monitoring need not be performed. Said other PDCCH is, for example, a PDCCH monitored in a CSS set of type 0/0A/2/3 PDCCH or in a USS set.

More specifically, monitoring in the set of CSS type 1 for PDCCH is given priority. However, such a rule is not established for random access without the possibility of collision on the demand of the PDCCH.

Accordingly, for random access without the possibility of collision triggered by a PDCCH request, if the PDCCH to be monitored by the terminal 20 in the type 1 CSS set for the PDCCH or the corresponding PDSCH overlaps with another PDCCH, and if that other PDCCH is not in a type D QCL relationship with this PDCCH requirement, monitoring is not required. In other words, it can be specified that if the other PDCCH is not in a Type D QCL relationship with the specified PDCCH and the PDSCH to be monitored in the PDCCH Type 1 CSS set, then terminal 20 is not required to monitor the other PDCCH.

The following describes the configuration of the PDCCH request for random access without the possibility of collision.

The PDCCH request initiating RACH is scrambled by a cell specific radio network Temporary Identifier (C-RNTI) used in the cell and may be received in the USS or in the CSS. After the transmission of Msg1 (PRACH preamble) triggered by the PDCCH request, the PDCCH is monitored for reception after Msg2 only in Type 1 CSS for the PDCCH. Thus, the search space for receiving a PDCCH request may be different from the PDCCH Type 1 CSS used for receiving after Msg2. Accordingly, the CORESET for receiving the PDCCH request may be different from the CORESET used for receiving after Msg2. The reason for this is that CORESET is configured individually for each search space.

However, since the monitoring interval varies individually for each SS, proper monitoring in searchspace #0 based on the CSI-RS may not be possible. If CSI-RS is specified as a QCL for receiving a PDCCH request in random access without the possibility of collision, and if SSB is specified as a QCL for a CORESET associated with any search space in which important information is signaled, such as call, OSI, or RMSI , then call monitoring, OSI, RMSI, or the like. may not be possible as priority is given to monitoring multiple CSS Type 1 for the PDCCH.

Accordingly, it may be mandatory to designate the SS as a type D QCL as the TCI state configuration of the CORESET in which the PDCCH request is transmitted. Alternatively, terminal 20 may assume that SSB is specified as the type D QCL as the TCI state configuration of the CORESET in which the PDCCH request is transmitted. In addition, when a QCL other than a Type D QCL is specified, another reference signal, such as CSI-RS, may be specified.

An operation in which the SS block is indicated, expected or required as a type D QCL for the configuration of the TCI state of the CORESET in which the PDCCH request is sent can only be used when a search space, such as for a call, OSI or RMSI, is associated with a searchspace #0. Alternatively, an operation in which the SS is specified, expected, or required as a type D QCL for configuring the TCI state of the CORESET in which the PDCCH request is sent can only be used when the TCI state configured for the CORESET with which the search space is associated eg for a call, OSI or RMSI, is the SS block. Alternatively, only when the search space, eg for call, OSI or RMSI, is associated with searchspace #0, and if the TCI state configured for the CORESET to which the search space is associated, eg for call, OSI or RMSI, is SS block, this SS block may be indicated, implied or required as a Type D QCL to configure the TCI state of the CORESET set in which the PDCCH request is sent,

Here, as a result of an operation for specifying, suggesting, or requesting an SS block as a type D QCL for configuring the TCI state of a CORESET in which a PDCCH request is transmitted, the SS block is used as a type D QCL for monitoring CSS type 1 for the PDCCH during the procedure random access. Accordingly, terminal 20 has the ability to simultaneously monitor another CSS, for example, for a call, OSI, or RMSI.

According to the above implementation, the terminal 20 during the random access procedure and after completion of the random access procedure can monitor the PDCCH search space based on an adequate QCL.

In other words, a terminal in a radio communication system can properly monitor a control signal transmitted from a base station.

Next, as an example in which the random access procedure is performed, an example of beam failure recovery (BFR) will be described. In NR, BFR is provided as a procedure for beam recovery when a failure occurs on a configured beam.

Beam failure recovery (BFR) is performed by terminal 20 based on a Collision Free Random Access (CFRA) procedure.

However, if the beamFailureRecoveryTimer expires during this procedure, then the terminal 20 proceeds to use the Collision Capable Random Access (CBRA) BFR fallback operation.

When terminal 20 performs BFR using CBRA, base station 10 may not be able to determine whether terminal 20 performs CBRA with a BFR purpose or another purpose.

To eliminate this shortcoming, it is proposed to make separate rules for selecting SSB for CBRA for the purpose of BFR and for other purposes.

More specifically, it is proposed to introduce a rule in CBRA to give priority to the choice of SSB depending on the purpose (condition) of initiating the CBRA.

(1) When CBRA is performed with a target other than BFR, the terminal 20 gives priority to the SSB that corresponds to the beam configured to receive the PDCCH and notifies the network that TCI configuration is not required.

(2) If CBRA is performed for BFR, then terminal 20 prioritizes an SSB other than the SSB corresponding to the beam configured to receive PDCCH and signals to the network that a new TCI configuration for BFR is needed.

The following remarks are made.

Note 1: The terminal 20 assumes that until a TCI activation is received or until the RRC changes the TCI state configuration, the beam indicated by the CFRA preamble to receive the PDCCH is used.

Note 2: After receiving Msg4, the terminal 20 performs a fallback to using the configuration for receiving the PDCCH that was active before the random access procedure. However, there is a BFR problem with this procedure, and later execution of this procedure may cause beam failures to be detected.

As stated above, it can be considered that the fallback to CBRA does not need to be based on the QCL that took place during the CFRA.

Accordingly, when BFR is performed using CBRA, terminal 20 can perform a fallback to CBRA without changing the configuration for receiving PDCCH that was active before the random access procedure, and terminal 20 can use the SSB found for random access preamble selection as QCL in CBRA. .

In the following, the substance of the foregoing is described in more detail.

With respect to the PRACH transmission with the possibility of collision in slot n, after the expiration of the beamFailureRecoveryTimer, terminal 20 monitors the PDCCH in the set of search spaces configured by ga-SearchSpace or searchSpaceZero, waiting for DCI with CRC scrambled using RA-RNTI starting from slot n+4 in the window configured by ra-ResponseWindow.

With regard to monitoring the PDCCH and receiving the corresponding PDSCH in the plurality of search spaces configured by ra-SearchSpace or searchSpaceZero, the terminal 20 uses a DM-RS antenna port k-alignment parameter which is the same as the DM-RS antenna port k-alignment parameter associated with by the SS/PBCH block selected by the terminal 20 to transmit the PRACH with the possibility of collision, until the terminal 20 receives any parameter transmitted by the upper layer among the activation of the TCI state or TCI-StatesPDCCH-ToAddlist and/or TCI-StatesPDCCH- To Release List.

Terminal 20, upon detecting a DCI format containing a CRC scrambled using RA-RNTI in the search space configured by ra-SearchSpace or searchSpaceZero, continues to monitor a candidate PDCCH in the search space configured by ra-SearchSpace or searchSpaceZero until will not accept a MAC CE with an activation command for TCI state or TCI-StatesPDCCH-ToAddlist and/or TCI-StatesPDCCH-ToRelease List.

Because the random access preamble for CBRA and SSB are related, when the detected SSB is used as the QCL, the base station 10 can also determine the QCL used by the terminal 20 based on the random access preamble transmitted from the base station 10. The QCL that took place during the CFRA can reduce the amount of change in the specifications and implementation of the terminal.

(Device configuration)

The following describes an example of the functional configuration of the base station 10 and the terminal 20 to perform the above-described processes and operations. The base station 10 and the terminal 20 contain functional elements for implementing the above-described implementations of the invention. However, both base station 10 and terminal 20 may contain only a portion of the functional elements of these implementations.

<Base Station 10>

Fig. 5 is an example of a functional diagram of a base station 10. The base station 10 shown in FIG. The functional configuration shown in Fig. 5 is just one example. Subject to the possibility of functioning according to the implementation of the present invention, the division into functional elements and the names of functional elements can be anything.

The transmission module 110 contains a functional element for generating a signal to be transmitted to the terminal 20 and for transmitting this signal by radio. The receiving module 120 includes a functional element for receiving various types of signals transmitted from the terminal 20 and for deriving, for example, upper layer information from the received signals. The transmission unit 110 includes a functional element for transmitting NR-PSS, NR-SSS, NR-PBCH, downlink/uplink control signals, or the like to the terminal 20.

The setting unit 130 is configured to store predetermined setting information and various types of setting information to be transmitted to the terminal 20 in the memory, and to read the setting information from the memory as needed. The contents of said setting information are, for example, control information for the terminal 20 and information related to random access.

As described in the implementations of the present invention, the control unit 140 performs an operation for generating control information to be transmitted to the terminal 20. The control unit 140 is configured to control the random access procedure performed with the terminal 20. A functional element in the control unit 140 related to signal transmission , may be contained in the transmission module 110, and a functional element in the control module 140 related to signal reception may be contained in the reception module 120.

<Terminal 20>

Fig. 6 is a diagram of an example of the functional configuration of the terminal 20. The terminal 20 shown in FIG. The functional configuration shown in FIG. 6 is just an example. Subject to the possibility of functioning according to the implementation of the present invention, the division into functional elements and the names of functional elements can be anything.

The transmission module 210 is configured to generate a signal to be transmitted from the data to be transmitted and to transmit this signal by radio. The receiving module 220 is configured to receive various signals over the radio and to obtain higher layer signals from the received physical layer signals. The receiving unit 220 includes a function for receiving NR-PSS, NR-SSS, NR-PBCH, downlink/uplink/immediate control signals or the like transmitted from the base station 10. The transmit unit 210 is configured to transmit to another terminal 20 Physical Sidelink Control Channel (PSCCH), Physical Sidelink Shared Channel (PSSCH), Physical Sidelink Discovery Channel (PSDCH), Physical Direct Broadcast Channel (Physical Sidelink Broadcast Channel, PSBCH) or the like, and the receiving unit 220 is configured to receive a PSCCH, PSSCCH, PSDCH, PSBCH, or the like. from another terminal 20.

The setting unit 230 is configured to store various types of setting information received from the base station 10 or the terminal 20 by the receiving unit 220 in the memory, and to read the setting information from the memory as needed. The tuning unit 230 is also configured to store preset tuning information. The contents of said setting information are, for example, control information for the terminal 20 and information related to random access.

As described in the implementations of the present invention, the control unit 240 monitors the control signal based on the control information obtained from the base station 10. The control unit 240 is configured to control the random access procedure performed with the base station 10. A functional element in the control unit 240 related to to signal transmission may be contained in the transmission module 210, and a functional element in the control module 240 related to signal reception may be contained in the reception module 220.

(Hardware configuration)

The functional diagrams (FIG. 5 and FIG. 6) used to describe the above implementations represent blocks of functional elements. These functional blocks (components) are implemented by an arbitrary combination of at least one of the hardware and software. Here, the implementation method of each function block is not specifically limited. In other words, each functional block may be implemented using a single device that is combined physically and/or logically, or may be implemented by directly or indirectly connecting (for example, via wired communication or radio communication) two or more devices that are physically or logically separated, and the use of this set of devices. The functional block may be implemented by combining software with the above described single device or with the above described multiple devices.

The functional blocks include functional blocks capable of, but not limited to, judging, deciding, determining, calculating, calculating, processing, inferring, exploring, searching, checking, receiving, transmitting, outputting, accessing, disambiguating, selecting, selecting, fact-finding, comparing, guessing, assuming, assuming, broadcasting, notifying, reporting, communicating, forwarding, setting, reconfiguring, placing, displaying, assigning, and the like. For example, a functional unit (component) functioning for the purpose of transmission is called a transmission module or transmitter. In any case, as mentioned above, the implementation method is not specifically limited.

For example, base station 10, terminal 20, etc. in accordance with the implementation of the present invention can function as computers performing radio communications according to the present invention. Fig. 7 shows an example of a hardware configuration of a base station 10 and a terminal 20 according to the present invention. Base station 10 and terminal 20 may be physically configured as a computing device, including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

It should be noted that in the following description, the term "device" may be interpreted as a circuit, a module, or the like. The hardware configuration of base station 10 and terminal 20 may contain one or more of the devices shown in the figure, or may not contain some of the devices.

Each functional module of base station 10 and terminal 20 is implemented by downloading predetermined software (programs) to hardware, such as processor 1001 and storage device 1002, so that processor 1001 is able to perform calculations and control communications performed by the device. 1004 communication, and by at least one of reading and writing data to the storage device 1002 and the auxiliary storage device 1003.

Processor 1001, for example, may execute an operating system to control an entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface to a peripheral device, a control device, a computing device, a register, or the like. For example, the above-described control unit 140, control unit 240, and the like can be implemented by the processor 1001.

In addition, the processor 1001 is configured to read a program (program code), a program module, data, and so on. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002 and with the ability to perform various operations in accordance with the specified programs and data. As said program, a program is used that causes the computer to execute at least a portion of the operations described in the above implementation. For example, the control module 140 of the base station 10 may be implemented by a control program stored in the memory 1002 and executed by the processor 1001. In addition, the control section 240 of the terminal 20 may be implemented by, for example, a control program stored in the memory 1002 and executed processor 1001. Although various operations have been described above as being performed on a single processor 1001, these operations may be performed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more integrated circuit chips. Said program may be transmitted from the network via a communication line.

Memory 1002 is a computer-readable storage medium and may be formed from at least one of, for example, read only memory (ROM), read only memory (ROM), read only memory (EPROM), electrically erasable read only memory (EEPROM), RAM, storage device (RAM), etc. The storage device 1002 may be referred to as a register, cache, main memory (main storage), etc. The storage device 1002 is configured to store a program (program code), program module, etc., which can be executed to perform the radio communication method according to embodiments of the present invention.

The storage device 1003 is a computer-readable storage medium and can be formed, for example, from at least one of the number of optical disk, for example, a compact disk (English Compact Disc ROM, CD-ROM), hard disk, floppy disk , magneto-optical disk (for example, CD, Digital Multipurpose Disc, Blu-ray Disc (registered trademark)), smart card, flash memory (for example, card, removable storage, removable disk), floppy disk (registered trademark) brand), magnetic tape, etc. The auxiliary storage device 1003 may be referred to as an additional storage device. The above storage medium may be, for example, a database containing at least one of the storage device 1002 and the auxiliary storage device 1003, a server, or other suitable storage medium.

The communication device 1004 is a hardware (receiver and transmitter) for communicating between computers via at least one of a wired network and/or radio network, and is also called, for example, a network device, a network controller, a network card, a module communications, etc. The communication device 1004 may be configured to contain, for example, a high frequency switch, an antenna switch, a filter, a frequency synthesizer, and so on. for the purpose of implementing at least one of a Frequency Division Duplex (FDD) and a Time Division Duplex (TDD). For example, transmit/receive antenna, amplification module, transmit/receive module, transmission line interface, etc. may be implemented by the communications device 1004. In the transmit/receive module, the transmit module and the receive module may be implemented with physical or logical separation.

The input device 1005 is an input means (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) for receiving information from outside. The output device 1006 is an output means (eg, display, acoustic emitter, LED, etc.) for outputting information. The input device 1005 and the output device 1006 may be combined (eg, in a touch panel).

All devices, such as processor 1001 and memory 1002, are connected by bus 1007 to exchange information. Bus 1007 may be formed from the same bus or from different device buses.

Both base station 10 and terminal 20 may contain hardware such as a microprocessor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a programmable logic device (eng. . Programmable Logic Device, PLD), a programmable matrix of logical elements (English Field Programmable Gate Array, FPGA), etc., through which all functional blocks can be fully or partially implemented. For example, processor 1001 may be implemented using at least one of these hardware components.

(Conclusion on implementations)

As stated above, according to implementations of the present invention, a terminal is provided, comprising: a control module configured to determine a spatial reception parameter of a control channel based on QCL information about a synchronization signal or a reference signal; and a receiving module configured to receive a control channel based on said determined spatial receive parameter, wherein if beam failure recovery (BFR) is performed using a collision-capable random access procedure, the control module, as a QCL parameter for monitoring the downlink control in the search space uses the QCL parameter associated with the synchronization signal block (SSB) found in the specified random access procedure with the possibility of conflict to select the random access preamble.

According to the above configuration, since the CBRA random access preamble and SSB are associated, the base station, using the detected SSB as the QCL, can find the QCL used by the terminal from the transmitted random access preamble. Since the fallback to CBRA does not use the QCL that was used during CFRA, changes to the specifications and implementation of the terminal can be reduced.

After the beamFailureRecoveryTimer expires, the control module may use a random access procedure with the possibility of a collision.

After transmitting the random access preamble in slot n, the receiving module can monitor the downlink control channel in the search space starting from slot n+4.

The control module may use as the QCL parameter to monitor the downlink control channel the QCL parameter associated with the specified SSB until a signal is received by the receiving module to activate the state of the transmission configuration indicator (TCI).

In addition, according to an implementation of the present invention, a terminal-executable communication method is provided, comprising: determining a control channel reception spatial parameter based on QCL information with a synchronization signal or a reference signal; and a step of receiving a control channel based on said determined receive spatial parameter, wherein if beam failure recovery (BFR) is performed using a collision-capable random access procedure, said method comprises a step of, as the QCL parameter for monitoring the downlink control channel in the search space uses the QCL parameter associated with the synchronization signal block (SSB) found in the specified random access procedure with the possibility of conflict to select the random access preamble.

According to the above configuration, since the CBRA random access preamble and SSB are associated, the base station, using the detected SSB as the QCL, can find the QCL used by the terminal from the transmitted random access preamble. Since the fallback to CBRA does not use the QCL that was used during CFRA, changes to the specifications and implementation of the terminal can be reduced.

(Additional implementations)

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the implementations given, and the skilled person will appreciate the possibility of various changes, modifications, alternatives, substitutions, etc. In the description, in order to facilitate understanding of the present invention, specific numerical examples are used, however, unless otherwise indicated, these values are only examples and any suitable value can be used. The division into parts in the above description is not essential to the present invention, and the contents described in two or more parts can be used in combination according to need, and the contents described in one part can be applied to the contents described in other part (if there is no contradiction). The boundaries of functional modules or processing modules in functional diagrams do not necessarily correspond to the boundaries of physical components. An operation performed by a plurality of functional modules may be physically performed by a single component, and an operation performed by a single functional module may be physically performed by a plurality of components. In the processing operations described in the present implementation, the order of processing may be changed if no incompatibility occurs. For convenience in describing the process, base station 10 and terminal 20 are described using functional diagrams, however, the devices in these diagrams may be implemented in hardware, software, or a combination of these methods. The program executed by the processor contained in the base station 10 according to the implementations of the present invention, and the program executed by the processor contained in the terminal 20 according to the implementations of the present invention, may be stored in random access memory (RAM), in flash memory, in read-only memory ( ROM), in Read Only Memory (EPROM), in Electrically Erasable Read Only Memory (EEPROM), in a register, on a hard disk, on a removable disk, on a CD, in a database, on a server, or on any other suitable medium information.

The reporting of information is not limited to the aspects/implementations described in this disclosure and may be performed in other manner. For example, the communication of information can be performed by physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (for example, RRC layer signaling, Medium Access Control (MAC) level signaling, broadcast information (Master Information Block, MIB), system information block (SIB))), other signals or their combinations. The RRC layer signaling may be referred to as an RRC message, which may be, for example, an RRC connection establishment message, an RRC connection reconfiguration message, and so on.

Aspects/implementations described in this disclosure may apply to a system using at least one of LTE, LTE-Advanced (LTE-Advanced, LTE-A), SUPER 3G, IMT-Advanced, Fourth generation (4G), fifth generation (5G) mobile communication systems, Future Radio Access (FRA), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, ultra-broadband mobile communication systems ( Ultra Mobile Broadband, UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, short distance communication systems using broadband signals with extremely low spectral density (Ultra-Wide Band, UWB), Bluetooth (registered trademark), any other suitable system, and a next generation system enhanced from these systems. In addition, multiple systems can be combined for use (eg, LTE and/or LTE-A can be combined with 5G).

Sequence in processing procedures, sequences, flowcharts, etc. each aspect/implementation described in this disclosure is subject to change provided there is no conflict. For example, the methods described in this disclosure present the elements of the various steps in an exemplary order, and are not limited to the specific order presented.

Particular operations that are described in this disclosure as being performed by base station 10 may, in some cases, be performed by an older node. Obviously, in a network containing one or more network nodes, including base station 10, various operations performed to communicate with terminal 20 may be performed by at least one of base station 10 and a network node other than base station 10 (for example, it may be MME or S-GW, but the possible network node is not limited to these). The above example shows the case where there is one host other than the base station 10. However, this host other than the base station 10 may be a combination of many other hosts (eg, MME and S-GW).

The information or signals described in the present disclosure may be transmitted from an upper layer (or lower layer) to a lower layer (or higher layer). Information and signals can be transmitted and received through a plurality of network nodes.

Information received and transmitted, etc. may be stored in a specific location (eg, in memory), or may be stored distributed using control tables. Information received and transmitted, etc. may be overwritten, changed or added. Information transmitted, etc. can be removed. Information received, etc. can be transferred to another device.

The determination in the present disclosure may be made based on a value (0 or 1) expressed by a single bit, based on a Boolean value (true or false), or based on a comparison with a numeric value (eg, comparison with a predetermined value).

Software, whether called "program", "internal program", "middleware", "microcode", "hardware description language" or otherwise, should be understood in a broad sense, covering instructions, sets instructions, code, code segments, program code, programs, subroutines, program modules, applications, software applications, software packages, objects, executable files, executable threads, procedures, functions, etc.

Software, instructions, information, etc. can also be transmitted and received via the transmission medium. For example, when a program is transmitted from a website, server, or other remote source using at least one of the wired media (such as coaxial cable, fiber optic cable, twisted pair cable, digital subscriber line, and wireless media) (eg, infrared radiation, microwaves, or the like), at least one of these wired media and wireless media is included in the definition of the transmission medium.

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, code sequences (chips), etc., which may be referred to in this disclosure, may be represented by voltages, currents, electromagnetic waves, magnetic fields, or magnetic particles, optical fields or photons, or any combination of the above.

The terms described in this disclosure and necessary for the understanding of this disclosure may be replaced by terms having the same or similar meaning. For example, at least one of the channels and symbols may be a signal. A signal can also be a message. The elementary carrier may also be referred to as frequency carrier, cell, frequency carrier, and so on.

In the present disclosure, the terms "system" and "network" are used interchangeably.

The information, parameters, and the like described in the present disclosure may also be expressed using absolute values, relative values with respect to predetermined values, or using separate relevant information. For example, the radio resources may be indicated by an index.

The names used for the parameters described above are not limiting in any way. In addition, the mathematical expressions that use these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (eg, PUCCH, PDCCH, or the like) and information elements may be referred to by any suitable names, the various names given to these various channels and information elements are not limiting in any respect.

In this disclosure, the terms "base station", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transfer point", "receiving point", "transmitting/receiving point", "cell", "sector", "cell group", "carrier", "elementary carrier", etc. can be used interchangeably. The base station may be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc., for example.

The base station may serve one or more (eg, three) cells. When a base station serves many cells, the entire coverage area of that base station can be divided into many smaller areas, in each of which communication services can be provided by a subsystem of the base station (for example, a small indoor base station or a remote radio unit (English Remote Radio Head). , RRH)). 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 providing communication services in that coverage area.

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", and the like can be used interchangeably.

A person skilled in the art may refer to a mobile station as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, and some other suitable terms.

At least one of a base station and a mobile station may be referred to as a transmitter, receiver, communication device, and so on. At least one of the base station and the mobile station may be a device mounted on the mobile unit, the mobile unit itself, and so on. The specified moving object can be a vehicle (for example, a car, an airplane, etc.), a moving object, the movement of which is carried out without a pilot on board (for example, a drone, an automated vehicle, etc.) or a robot (controlled by human type or unmanned type). At least one of the base station and the mobile station includes a device that does not necessarily move during communication operations. For example, at least one of the base station and mobile station may be an Internet of Things (IoT) device, such as a sensor.

Further, the base station in the present invention can be interpreted as a user terminal. For example, various aspects/implementations of the present invention may, instead of a configuration in which communication is between a base station and a user terminal, be applied to a configuration in which communication is between a plurality of user terminals 20 (which may be referred to as device-to-device communication). Device, D2D), communication between a vehicle and a wide range of objects (English V2X, Vehicle-to-Everything), etc.). In this case, the configuration may be such that the functional element described above as contained in the base station 10 is contained in the user terminal 20. The terms "uplink" and "downlink" can also be replaced by terms corresponding to the direct communication between the terminals (for example, the expression "relating to a direct connection"). For example, "uplink", "downlink", etc. can be replaced by "immediate channel".

Likewise, in the present disclosure, "user terminal" may be replaced by "base station". In this case, the configuration may be such that the functional element described above as contained in the user terminal may be contained in the base station.

The content of the terms "determine (determination)" and "decide (decision)" used in this disclosure may include various types of operations. For example, the terms "definition" and "decision" may include the concept of what is determined or by decision the result of a judgment, calculation, calculation, processing, inference, research, search (for example, search in a table, database or other structure). data) or statements. In addition, the terms "determining" and "decision" may include, for example, the belief that is determined or by decision the result of receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, or access ( e.g. accessing data in memory). In addition, the terms "definition" and "decision" may include the idea that one determines or by decision the result of disambiguation, selection, selection, fact finding, or comparison is made. More specifically, the terms "determination" and "decision" may include the belief that it is determined or decided to perform some operation. “Determining (making a decision)” can be interpreted as “believing”, “expecting”, “considering”, etc.

The term "connected" or "connected" or any variant thereof means any direct or indirect connection or connection between two or more elements, including the presence of one or more intermediate elements between two elements that are "connected" or "connected" to each other. . The relationship or connection between these elements may be physical, logical, or a combination of both. For example, the term "connection" can be replaced with "access". In the present disclosure, two elements may be considered to be "connected" or "coupled" together using at least one of one or more conductors, cables, and printed electrical connections, and, as a few non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency range, in the microwave range and in the light range (both visible and invisible).

The Reference Signal may be abbreviated as RS or, depending on the applicable standards, may be referred to as a pilot signal.

In this disclosure, the expression "based on" does not mean "only based on", unless otherwise indicated. In other words, the expression "on the basis of" means both "on the basis of" and "at least on the basis of".

Any reference to elements using designations such as "first" or "second" in this disclosure does not generally limit the number or order of those elements. Such designations may be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, the mention of the first and second elements does not imply that only two elements can be used, or that the first element must in any way precede the second element.

The term "means" in the configuration of each of the devices described above may be replaced by the term "part", "circuit", "device", etc.

When terms such as "include", "comprising" and variations thereof are used in the present disclosure, these terms are to be understood in the sense of including, similar to the meaning of the term "comprising". The conjunction "or" in this disclosure is not to be understood as meaning an exclusive disjunction.

A radio frame may be formed from one or more frames in the time domain. In the time domain, each of said one or more frames may be referred to as a subframe. Further, a subframe in the time domain may be formed from one or more slots. The subframe may have a fixed time duration (eg, 1 ms) independent of numerology.

Numerology may refer to a communication parameter applied to at least one of the transmission and reception of a signal or channel. The numerology can represent, for example, at least one of SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processing performed by the transceiver in the frequency domain, and specific windowing performed by the transceiver in the time domain, and so on.

A slot in the time domain may be formed from one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols), Single Carrier Frequency Division symbols Multiple Access, SC-FDMA), etc.). The slot can be a temporary element depending on numerology.

A slot may contain a plurality of mini-slots. In the time domain, each mini-slot may be formed by one or more symbols. A mini-slot may also be referred to as a sub-slot. A mini-slot can be formed with fewer symbols than a slot. PDSCH (or PUSCH) transmission in a tile larger than a mini-slot may be referred to as PDSCH Mapping Type A (PUSCH). PDSCH (or PUSCH) transmission using a mini-slot may be referred to as PDSCH Map Type B (PUSCH).

The radio frame, subframe, slot, mini-slot, and symbol are temporary elements for signal transmission. The radio frame, subframe, slot, mini-slot, and symbol may be referred to by other appropriate names.

For example, one subframe may be referred to as a transmission time interval; a plurality of consecutive subframes may be referred to as a transmission time interval; one slot or one mini-slot may be referred to as a transmission timeslot. Thus, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, may be a period shorter than 1 ms (eg, 1 to 13 symbols), or a period longer than 1 ms. Note that an element representing a TTI may not be referred to as a subframe, but as a slot, mini-slot, and so on.

Here TTI denotes, for example, the smallest time element for scheduling in radio communication. For example, in an LTE system, a base station performs scheduling for each terminal 20 to allocate radio resources (eg, bandwidth, transmit power, etc. allowed to be used in each terminal 20) using TTI as an element. The definition of TTI intervals is not limited to this.

The TTI may be a transmission time element, such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing element for scheduling, link adaptation, and so on. It should be appreciated that when a TTI is provided, the time interval (eg, number of symbols) for which a transport block, code block, or codeword is actually mapped may be shorter than that TTI.

Note that when a TTI is referred to as one slot or one mini-slot, the minimum time element for scheduling may be one or more TTIs (ie, one or more slots or one or more mini-slots). In addition, the number of slots (number of mini-slots) constituting this minimum scheduling time element can be controllable.

A TTI with a time duration of 1 ms may be referred to as a regular TTI (TTI in LTE Release 8-12), a normal TTI, a long TTI, a regular subframe, a normal subframe, a long subframe, a slot, and so on. A TTI that is shorter than a normal TTI may be referred to as a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini-slot, subslot, slot, and so on.

Note that a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI with a time duration greater than 1 ms, and a short TTI (e.g., shortened TTI) may be replaced by a TTI with a duration shorter than the long TTI. TTI and greater than 1 ms.

A resource block (RB) is a resource allocation element in the time domain and in the frequency domain, and in the frequency domain, it may contain one subcarrier or a plurality of subcarriers in succession. The number of subcarriers contained in a resource block may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers in a resource block may be determined based on the numerology.

In addition, in the time domain, a resource block may contain one or more symbols and may be one slot, one mini-slot, one subframe, or one TTI in length. Both one TTI and one subframe may be formed from one or more resource blocks.

It should be noted that one or more resource blocks can be called a physical resource block (English Physical RB, PRB), a sub-carrier group (English Sub-Carrier Group), a group of resource elements (English Resource Element Group, REG), a PRB pair, a pair of resource blocks, etc.

In addition, a resource block can be formed from one or more resource elements (English Resource Element, RE). One resource element may be, for example, a radio resource region of one subcarrier and one symbol.

The Bandwidth Part (BWP) (which may also be referred to as a partial band, etc.) may be a subset of consecutive uninterrupted common resource blocks (common RBs) on a specific carrier, given for a specific numerology. Here, if a common carrier position is used as the reference, the common RB may be indicated by the RB index. PR B can be defined in the BWP and numbered there.

The BWP may comprise an uplink BWP (UL BWP) and a downlink BWP (DL BWP). One or more BWPs may be configured for a UE within a single carrier.

At least one of the configured BWPs may be active, and the UE may assume that the predetermined signal/channel is not transmitted outside of the active BWP. It should be noted that "cell", "carrier", etc. in this disclosure may be replaced by "BWP".

The above configurations of radio frame, subframe, slot, mini-slot, and symbol are just examples. For example, the following configuration items may vary in various ways: the number of subframes contained in a radio frame; the number of slots per subframe or radio frame; the number of mini-slots contained in the slot; the number of symbols and resource blocks contained in the slot or mini-slot; the number of subcarriers contained in the resource block; number of characters, character length, length of the cyclic prefix (eng. Cyclic Prefix, CP), etc. at TTI.

In the present disclosure, when, for example, an article is added to a noun as a result of translation, for example, "a", "an" and "the" in English, it is understood that the noun following this article can also be understood in the plural .

In the present disclosure, the expression "A and B are different" may mean "A and B are different from each other." Note that this expression can also mean "both A and B are different from C". Terms such as "separate", "connected", etc. can also be interpreted similarly.

Aspects/implementations described in this disclosure may be used alone, in combination, or vary from implementation to implementation. Reporting predetermined information (eg, reporting X) is not limited to being done explicitly, and may also be done implicitly (eg, not reporting predetermined information).

In the present disclosure, Type D QCL is an example of QCL information. The SS or CSI-RS block is an example of a synchronization signal or a reference signal. The PDCCH request is an example of specifying a control channel. The CSS type 1 set for the PDCCH is an example of the first search space. The 0/0A/2/3 CSS set for PDCCH and the USS set are examples of the second search space. The set of CSS type 0 for PDCCH or Searchspace #0 are examples of the third search space.

Although the present invention has been described in detail above, it should be apparent to those skilled in the art that the present invention is not limited to the implementations presented in this disclosure. The present invention may be embodied with changes and modifications without departing from the spirit and scope of the present invention as defined by the claims. Accordingly, the description of the present invention is for illustrative purposes only and is not intended to be limiting to the present invention.

This international patent application is based on Japanese Patent Application No. 2019-032848, filed February 26, 2019. Priority benefits are claimed by said application, and all of its contents are incorporated herein by reference.

List of reference designations

10 base station

110 transmission module

120 receiving module

130 tuning module

140 control module

20 terminal

210 transmission module

220 receiving module

230 tuning module

240 control module

1001 processors

1002 storage device

1003 auxiliary storage device

1004 communication device

1005 input device

1006 output device.

Claims (18)

1. Terminal containing: a control module, configured to determine a downlink control channel reception spatial parameter based on QCL information about the synchronization signal or the reference signal; And a receiving module configured to receive a downlink control channel based on said determined spatial receive parameter, wherein the control module is configured, upon expiration of the beamFailureRecoveryTimer timer and if beam failure recovery (BFR) is performed using a random access procedure with the possibility of conflict, to use the QCL parameter associated with the synchronization signal block (SSB) found in said random access procedure with the possibility of contention to select the random access preamble, as a QCL parameter for monitoring the downlink control channel in the search space. 2. The terminal of claim 1, wherein the receiving module is configured, after transmitting the random access preamble in slot N, to monitor the downlink control channel in the search space starting from slot n+4. 3. The terminal of claim 1, wherein the control module is configured to use as the QCL parameter to monitor the downlink control channel the QCL parameter associated with the specified SSB until a signal is received by the receiving module to activate the state of the transmission configuration indicator (TCI). 4. Communication method for the terminal, including: on the basis of the kvasocombination (QCL) information about the synchronization signal or the reference signal, a spatial reception parameter of the downlink control channel is determined; And based on said specific receive spatial parameter, a control channel is received, when the beamFailureRecoveryTimer expires and if beam failure recovery (BFR) is performed using a random access procedure with the possibility of collision, then this method includes the step of using the QCL parameter associated with with a synchronization signal block (SSB) found in the specified random access procedure with the possibility of a collision for selecting a random access preamble. 5. A radio communication system, comprising: base station; And terminal, where the base station contains a transmission module configured to transmit a downlink control channel, and wherein the terminal comprises a control module, configured to determine a downlink control channel reception spatial parameter based on QCL information about the synchronization signal or the reference signal; And a receiving module configured to receive a downlink control channel based on said determined spatial receive parameter, wherein the control module is configured, upon expiration of the beamFailureRecoveryTimer timer and if beam failure recovery (BFR) is performed using a random access procedure with the possibility of conflict, to use the QCL parameter associated with the synchronization signal block (SSB) found in said random access procedure with the possibility of contention to select the random access preamble, as a QCL parameter for monitoring the downlink control channel in the search space.

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