Communication device, base station, and communication method

Abstract

A communication device (100) according to one embodiment comprises: a reception unit (112) that receives, from a base station, a radio resource control (RRC) message including information for setting one or a plurality of SSB periods for a synchronization signal / physical broadcast channel block (SSB); and a control unit (120) that monitors a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which is set a value corresponding to the one or plurality of SSB periods. On the basis of the number of SSB periods set by the information for setting the one or plurality of SSB periods, the control unit determines the number of bits in the field in which is set the value corresponding to the one or plurality of SSB periods.

Description

Communication device, base station, and communication method CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on and claims the benefit of priority from patent application serial number 2024-131067, filed August 7, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a communication device, a base station, and a communication method.

[0003] Network Energy Saving (NES) has been discussed in mobile communication systems that comply with the technical specifications of 3GPP (Third Generation Partnership Project), a standardization project for mobile communication systems. As one of the NES technologies, a technology for adaptively transmitting Synchronization Signal Blocks (SSBs) in the time domain (hereinafter referred to as SSB adaptation) has been studied (see, for example, Non-Patent Document 1).

[0004] In SSB adaptation, for example, the SSB transmission period can be dynamically changed, which allows the SSB transmission period to be changed at shorter intervals than when the SSB transmission period is changed by updating the system information block (SIB), thereby saving energy in the network.

[0005] "RP-234065" (Rel-19 WID Network Energy Saving)

[0006] A communication device according to a first aspect includes a receiver that receives, from a base station, a radio resource control (RRC) message including information for configuring one or more SSB periodicities for synchronization signals / physical broadcast channel blocks (SSBs), and a controller that monitors a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periodicities is set, and the controller determines the number of bits of the field in which the value corresponding to the one or more SSB periodicities is set based on the number of SSB periodicities set by the information for configuring the one or more SSB periodicities.

[0007] A base station according to a second aspect includes a transmitter configured to transmit, to a communication device, a radio resource control (RRC) message including information for configuring one or more SSB periodicities for synchronization signals / physical broadcast channel blocks (SSBs). The transmitter transmits a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periodicities is set. The number of bits in the field in which the value corresponding to the one or more SSB periodicities is set is based on the number of SSB periodicities configured by the information for configuring the one or more SSB periodicities.

[0008] A communication method according to a third aspect is a communication method executed by a communication device, the communication method comprising the steps of: receiving, from a base station, a radio resource control (RRC) message including information for configuring one or more SSB periodicities for synchronization signals / physical broadcast channel blocks (SSBs), monitoring a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periodicities is set, and determining a number of bits of the field in which a value corresponding to the one or more SSB periodicities is set based on the number of SSB periodicities configured by the information for configuring the one or more SSB periodicities.

[0009] Objects, features, advantages, etc. of the present disclosure will become clearer from the following detailed description with reference to the accompanying drawings. FIG. 1 is a diagram illustrating a configuration of a mobile communication system according to an embodiment. FIG. 2 is a diagram illustrating an example configuration of a protocol stack according to an embodiment. FIG. 3 is a diagram illustrating a configuration of a UE according to an embodiment. FIG. 4 is a diagram illustrating a configuration of a base station according to an embodiment. FIG. 5 is a sequence diagram illustrating a first operation example according to an embodiment. FIG. 6 is a diagram (part 1) illustrating the first operation example according to an embodiment. FIG. 7 is a diagram (part 2) illustrating the first operation example according to an embodiment. FIG. 8 is a flowchart illustrating the first operation example according to an embodiment. FIG. 9 is a sequence diagram illustrating a second operation example according to an embodiment. FIG. 10 is a sequence diagram illustrating a third operation example according to an embodiment.

[0010] A mobile communication system according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

[0011] When SSB is adaptively transmitted in the time domain, the operation of the communication device is not specified, and there is a concern that it may not be able to perform appropriate operation.

[0012] An object of the present disclosure is to provide a communication device, a base station, and a communication method that enable the communication device to perform appropriate operations when SSB is adaptively transmitted in the time domain.

[0013] (System Configuration) First, the configuration of a mobile communication system 1 according to this embodiment will be described with reference to Fig. 1. The mobile communication system 1 is, for example, a system that complies with the 3GPP Technical Specification (TS). In the following, the mobile communication system 1 will be described using as an example a 5th Generation System (5G system) of the 3GPP standard, i.e., a mobile communication system based on NR (NR (New Radio) radio access).

[0014] The mobile communication system 1 includes a network 10 and a user equipment (UE) 100 that communicates with the network 10. The network 10 includes a next generation radio access network (NG-RAN) 20, which is a 5G radio access network, and a 5G core network (5GC) 30, which is a 5G core network.

[0015] The UE 100 is a communication device that communicates via the base station 200. The UE 100 may be a device used by a user. The UE 100 may be a mobile device such as a mobile phone terminal such as a smartphone, a tablet terminal, a laptop PC, a communication module, or a communication card. The UE 100 may be a vehicle (e.g., a car, a train, etc.) or a device provided therein (e.g., a Vehicle UE). The UE 100 may be a transport vehicle other than a vehicle (e.g., a ship, an airplane, etc.) or a device provided therein (e.g., an Aerial UE). The UE 100 may be a sensor or a device provided therein. Note that the UE 100 may be referred to by other names such as a terminal, a terminal device, a mobile station, a mobile terminal, a mobile device, a mobile unit, a subscriber station, a subscriber terminal, a subscriber device, a subscriber unit, a wireless station, a wireless terminal, a wireless device, a wireless unit, a remote station, a remote terminal, a remote device, or a remote unit. Furthermore, the UE 100 is an example of a terminal, and the terminal may include factory equipment or the like.

[0016] The NG-RAN 20 includes multiple base stations 200. Each base station 200 manages at least one cell. One or more base stations 200 may correspond to one or more cells. A base station 200 may be replaced with a cell, or a cell may be replaced with a base station 200. A cell constitutes the smallest unit of a communication area. One cell belongs to one frequency (carrier frequency). The term "cell" may refer to wireless communication resources or to a communication target of the UE 100. Each base station 200 can perform wireless communication with the UE 100 located in its own cell. The base station 200 communicates with the UE 100 using a RAN protocol stack. Details of the protocol stack will be described later. Furthermore, the base station 200 is connected to other base stations 200 (which may be referred to as neighbor base stations) via an Xn interface. The base station 200 communicates with the neighbor base stations via the Xn interface. In addition, the base station 200 provides NR user plane and control plane protocol termination for the UE 100 and is connected to the 5GC 30 via an NG interface. Such an NR base station 200 is sometimes referred to as a gNodeB (gNB).

[0017] The 5GC 30 includes a core network device 300. The core network device 300 includes, for example, an AMF (Access and Mobility Management Function) and / or a UPF (User Plane Function). The AMF performs mobility management for the UE 100. The UPF provides functions specialized for U-plane processing. The AMF and the UPF are connected to the base station 200 via an NG interface.

[0018] (Configuration Example of Protocol Stack) Next, a configuration example of a protocol stack according to this embodiment will be described with reference to FIG.

[0019] The protocol of the wireless section between UE 100 and base station 200 includes a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, and a radio resource control (RRC) layer.

[0020] The PHY layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data and control information are transmitted between the PHY layer of the UE 100 and the PHY layer of the base station 200 via a physical channel.

[0021] The MAC layer performs data priority control, retransmission processing using Hybrid ARQ (HARQ), random access procedures, etc. Data and control information are transmitted between the MAC layer of UE 100 and the MAC layer of base station 200 via a transport channel. The MAC layer of base station 200 includes a scheduler. The scheduler determines the uplink and downlink transport format (transport block size, modulation and coding scheme (MCS)) and the resources to be allocated to UE 100.

[0022] The RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the PHY layer. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the base station 200 via logical channels.

[0023] The PDCP layer performs header compression / decompression and encryption / decryption.

[0024] A Service Data Adaptation Protocol (SDAP) layer may be provided as an upper layer above the PDCP layer. The SDAP layer maps IP flows, which are units for Quality of Service (QoS) control by the core network, to radio bearers, which are units for QoS control by an Access Stratum (AS).

[0025] The RRC layer controls logical channels, transport channels, and physical channels according to the establishment, re-establishment, and release of radio bearers. RRC signaling for various settings is transmitted between the RRC layer of the UE 100 and the RRC layer of the base station 200. When there is an RRC connection between the RRC layer of the UE 100 and the RRC layer of the base station 200, the UE 100 is in an RRC connected state. When there is no RRC connection between the RRC layer of the UE 100 and the RRC layer of the base station 200, the UE 100 is in an RRC idle state. When the RRC connection between the RRC layer of the UE 100 and the RRC layer of the base station 200 is suspended, the UE 100 is in an RRC inactive state.

[0026] The NAS layer, which is located above the RRC layer in the UE 100, performs session management and mobility management for the UE 100. NAS signaling is transmitted between the NAS layer of the UE 100 and the NAS layer of the core network device 300.

[0027] The UE 100 has an application layer and the like in addition to the radio interface protocol.

[0028] (Radio Frame Configuration) In a 5G system, downlink transmission and uplink transmission are configured within a radio frame having a duration of 10 ms. For example, a radio frame is represented by a system frame number (SFN) ranging from 0 to 1023. For example, a radio frame is configured with 10 subframes. For example, one subframe may be 1 ms. Furthermore, one subframe may be configured with one or more slots. For example, the number of symbols that make up one slot is 14 for a normal CP (Cyclic Prefix) and 12 for an extended CP. Furthermore, the number of slots that make up one subframe varies depending on the set subcarrier spacing. For example, for a normal CP, if the subcarrier spacing is set to 15 kHz, the number of slots per subframe is 1 (i.e., 14 symbols); if the subcarrier spacing is set to 30 kHz, the number of slots per subframe is 2 (i.e., 28 symbols); if the subcarrier spacing is set to 60 kHz, the number of slots per subframe is 4 (i.e., 56 symbols); and if the subcarrier spacing is set to 120 kHz, the number of slots per subframe is 8 (i.e., 112 symbols). Furthermore, if the subcarrier spacing is set to 60 kHz for an extended CP, the number of slots per subframe is 4 (i.e., 48 symbols). That is, the number of slots constituting one subframe is determined based on the subcarrier spacing set by the base station 200. Furthermore, the number of symbols constituting one subframe is determined based on the subcarrier spacing set by the base station 200. That is, the number of symbols constituting a 1 ms subframe is determined based on the subcarrier spacing set by the base station 200, and the length of each symbol (length in the time direction) changes.

[0029] (Anticipated Scenario) In a mobile communication system that complies with the technical specifications of 3GPP, a standardization project for mobile communication systems, Network Energy Saving (NES) is being discussed. As one of the NES technologies, a technology for adaptively transmitting Synchronization Signal Blocks (SSBs) in the time domain (hereinafter referred to as SSB adaptation) is being considered.

[0030] In SSB adaptation, for example, the SSB transmission period can be dynamically changed, which allows the SSB transmission period to be changed at shorter intervals than when the SSB transmission period is changed by updating the system information block (SIB), thereby saving energy in the network.

[0031] However, when SSB is adaptively transmitted in the time domain, the operation of UE 100 is not specified, and there is a concern that appropriate operation may not be performed. Therefore, in the following, an operation for enabling UE 100 to perform appropriate operation when SSB is adaptively transmitted in the time domain will be described.

[0032] Note that a synchronization signal block (SSB) may also be referred to as a synchronization signal (SS) / physical broadcast channel (PBCH) block (SS / PBCH block). An SSB may consist of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). An SSB consists of four OFDM symbols in the time domain and 240 consecutive subcarriers in the frequency domain. Each of the PSS and SSS occupies one OFDM symbol and 127 subcarriers. The PBCH spans three OFDM symbols and 240 subcarriers. The location (e.g., frequency domain location and / or time domain location) of the resource elements to which the SSBs are mapped may be specified by a specification. For example, as described below, the position of the resource element to which the SSB is mapped (e.g., the index of the candidate SSB that is the candidate for actually transmitting the SSB (e.g., the index of the first symbol of the candidate SSB)) may be specified based on the subcarrier spacing of the SSB.

[0033] For example, the SSB may be transmitted in an initial downlink bandwidth portion (BWP) of the cell. The SSB may also be transmitted in an activated downlink BWP (i.e., an active downlink BWP) of the cell. The UE 100 may receive the SSB to perform a cell search. For example, the cell search may be a procedure for the UE 100 to acquire time and / or frequency synchronization with the cell. The cell search may also be a procedure for the UE 100 to detect a physical cell identifier (PCI) of the cell.

[0034] Furthermore, the UE 100 may measure a radio signal based on the SSB. For example, the UE 100 may measure radio quality (e.g., received power (so-called SS-RSRP: SS reference signal received power) and / or received quality (so-called SS reference signal received quality: SS-RSRQ)) based on the SSB. The UE 100 may transmit the measurement result of the radio signal based on the SSB to the base station 200 as a measurement report. Furthermore, the UE 100 may perform beam failure detection based on the SSB. For example, the UE 100 may detect a beam failure based on the SSB set as a downlink reference signal resource for detecting a beam failure, and report the detection to the base station 200.

[0035] (Configuration of User Equipment) The configuration of the UE 100 according to the embodiment will be described with reference to Fig. 4. The UE 100 includes a communication unit 110 and a control unit 120.

[0036] The communication unit 110 performs wireless communication with the base station 200 by transmitting and receiving radio signals to and from the base station 200. The communication unit 110 has at least one transmission unit 111 and at least one reception unit 112. The transmission unit 111 and the reception unit 112 may be configured to include multiple antennas and RF (Radio Frequency) circuits. The antenna converts a signal into radio waves and radiates the radio waves into space. The antenna also receives radio waves in space and converts the radio waves into a signal. The RF circuit performs analog processing of the signal transmitted and received via the antenna. The RF circuit may include a high-frequency filter, an amplifier, a modulator, a low-pass filter, etc.

[0037] The control unit 120 performs various controls in the UE 100. The control unit 120 controls communication with the base station 200 via the communication unit 110. The operations of the UE 100 described above and below may be operations controlled by the control unit 120. The control unit 120 may include at least one processor capable of executing a program and a memory that stores the program. The processor may execute the program to perform the operations of the control unit 120. The control unit 120 may include a digital signal processor that performs digital processing of signals transmitted and received via the antenna and the RF circuit. The digital processing includes processing of a RAN protocol stack. The memory stores the program executed by the processor, parameters related to the program, and data related to the program. The memory may include at least one of read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), and flash memory. All or a portion of the memory may be contained within the processor.

[0038] (Configuration of Base Station) The configuration of the base station 200 according to this embodiment will be described with reference to Fig. 5. The base station 200 includes a communication unit 210, a network communication unit 220, and a control unit 230.

[0039] The communication unit 210 receives, for example, a radio signal from the UE 100 and transmits the radio signal to the UE 100. The communication unit 210 has at least one transmission unit 211 and at least one reception unit 212. The transmission unit 211 and the reception unit 212 may be configured to include an RF circuit. The RF circuit performs analog processing of signals transmitted and received via an antenna. The RF circuit may include a high-frequency filter, an amplifier, a modulator, a low-pass filter, etc.

[0040] The network communication unit 220 transmits and receives signals to and from the network. For example, the network communication unit 220 receives signals from adjacent base stations connected via an Xn interface, which is an interface between base stations, and transmits the signals to the adjacent base stations. The network communication unit 220 also receives signals from the core network device 300 connected via an NG interface, and transmits the signals to the core network device 300.

[0041] The control unit 230 performs various controls in the base station 200. The control unit 230 controls, for example, communication with the UE 100 via the communication unit 210. The control unit 230 also controls, for example, communication with a node (e.g., a neighboring base station, the core network device 300) via the network communication unit 220. The operations of the base station 200 described above and below may be controlled by the control unit 230. The control unit 230 may include at least one processor capable of executing a program and a memory that stores the program. The processor may execute the program to perform the operations of the control unit 230. The control unit 230 may include a digital signal processor that performs digital processing of signals transmitted and received via the antenna and the RF circuit. The digital processing includes processing of a RAN protocol stack. The memory stores programs executed by the processor, parameters related to the programs, and data related to the programs. All or a part of the memory may be included in the processor.

[0042] (First Operation Example) A first operation example will be described with reference to Fig. 5 to Fig. 8. Previously described explanations may be omitted.

[0043] The UE 100 may be in an RRC idle state or an RRC inactive state with a cell managed by the base station 200. The UE 100 may be in an RRC connected state with the cell. The cell may be a cell on which the UE 100 is camped, or may be a cell that the UE 100 has (re)selected. The cell may be a cell with which the UE 100 has established an RRC connection.

[0044] Note that, for UE 100, communication with base station 200 may be communication with a cell. Therefore, for UE 100, receiving information / messages, etc. from base station 200 may be receiving information / messages, etc. from a cell, and transmitting information / messages, etc. to base station 200 may be transmitting information / messages, etc. to a cell.

[0045] In this operation example, the cell communicating with the UE 100 is a cell that supports SSB adaptation, in which SSB is adaptively transmitted in the time domain. The cell may be a serving cell for the UE 100. The serving cell may be a primary cell (P-cell) and / or a secondary cell (S-cell). Note that SSB adaptation may only be applied to the NES cell. The NES cell may be, for example, a dedicated cell for Release 19 NES UEs to which Release 19 NES UEs are permitted to access.

[0046] Furthermore, the SSBs subject to SSB adaptation may be cell-defining SSBs (CD-SSBs) and / or non-cell-defining SSBs (NCD-SSBs). CD-SSBs are SSBs associated with Remaining Minimum System Information (RMSI). NCD-SSBs are SSBs not associated with RMSI. RMSI is a system information block type 1 (SIB1). SIB1 may specify the scheduling of other system information blocks. SIB1 may include information required for initial access.

[0047] Step S101: The transmitter 211 of the base station 200 may transmit an RRC message including predetermined information for identifying the reception timing of the SSB to the UE 100. The receiver 112 of the UE 100 may receive the RRC message from the base station 200 (cell). For example, the reception timing of the SSB (i.e., the transmission timing of the SSB) may be indicated by a subframe, a slot, and / or a symbol. That is, the reception timing of the SSB (i.e., the transmission timing of the SSB) may include the time domain position at which the SSB is received (or transmitted). As described below, in this embodiment, the reception (or transmission) of the SSB may correspond to the indication of a reception opportunity (or transmission opportunity) for the SSB. That is, the reception timing of the SSB (i.e., the transmission timing of the SSB) may include the reception timing of a candidate SSB (i.e., the transmission timing of a candidate SSB). Furthermore, as described below, the SSB (and / or candidate SSB) may be configured in a half frame (e.g., a half frame with an SSB). That is, the reception timing of the SSB (i.e., the transmission timing of the SSB) may include the reception timing (or the transmission timing) of the half frame (e.g., a half frame with an SSB).

[0048] The RRC message may be a System Information Block Type 1 (SIB1) (also referred to as an SIB1 message). SIB1 contains information relevant to evaluating whether a UE is authorized to access a cell and specifies the scheduling of other system information. The RRC message may also be an RRC Reconfiguration message, which is a command to modify an RRC connection, an RRC Resume message used to resume a suspended RRC connection, or an RRC Setup message used to establish a signaling radio bearer (e.g., SRB1). Here, SIB1 is also referred to as system information. System information may include SIB1 and system information block types other than SIB1.

[0049] The predetermined information may be included in information used to configure cell-specific parameters of a serving cell of a UE in SIB1 (hereinafter, serving cell configuration common SIB information (e.g., ServingCellConfigCommonSIB)). In addition, the predetermined information may be included in information used to configure cell-specific parameters of a serving cell of a UE (hereinafter, serving cell configuration common information (e.g., ServingCellConfigCommon)) or information used to configure (e.g., add or change) a serving cell for a UE (hereinafter, serving cell configuration information (e.g., ServingCellConfig)).

[0050] The predetermined information may include periodicity information (e.g., ssb-PeriodicityServingCell) for setting one or more periods as the SSB periodicity. The periodicity information may be, for example, information for providing the periodicity of half frames for receiving SSBs for the serving cell. The periodicity information may be, for example, capable of setting any one of 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, and 160 ms, or may be capable of setting a period longer than 160 ms. The periodicity information may indicate one or more SSB periods. Each of the multiple pieces of information constituting the periodicity information may indicate an SSB period.

[0051] The predetermined information may include information indicating the subcarrier spacing of SSB (hereinafter referred to as SSB subcarrier spacing (e.g., ssbSubcarrierSpacing)).

[0052] The predetermined information may include time position information (e.g., ssb-PositionsInBurst) for setting one or more time positions as positions in the time domain of the SSB. The time position information may indicate the time domain positions of SS blocks (SS-blocks) transmitted within an SS burst (SS-burst). Each of the multiple pieces of information constituting the time position information may indicate a time position. An SS burst may correspond to a half frame for receiving an SSB for the serving cell. As described above, for example, if a radio frame (i.e., one radio frame) has a duration of 10 ms, a half frame may correspond to 5 ms.

[0053] That is, based on the time position information, a position for transmitting (i.e., a position for receiving) an SSB in a half frame (i.e., a duration of 5 ms) may be indicated. For example, based on the time position information, a position at which an SSB is actually transmitted (i.e., a position at which an SSB is actually received) may be indicated. That is, at a time position set for transmitting an SSB (hereinafter also referred to as a candidate SSB or a candidate SSB index), a time position at which an SSB is actually transmitted may be indicated based on the time position information. Also, at a time position set for receiving an SSB (i.e., a candidate SSB or a candidate SSB index), a time position at which an SSB is actually received may be indicated based on the time position information. Here, a time position set for transmitting (or receiving) an SSB (i.e., a candidate SSB or a candidate SSB index) is also referred to as an SSB transmission opportunity (or reception opportunity).

[0054] That is, UE 100 may assume that an SSB will be transmitted (or received) during an SSB transmission opportunity (or reception opportunity). As described above, for example, an SSB transmission opportunity (or reception opportunity) may be determined based on the subcarrier spacing of the SSB. Also, UE 100 may assume that an SSB will actually be transmitted (i.e., received) during an SSB transmission opportunity (or reception opportunity). For example, the time domain position at which an SSB is actually transmitted (i.e., received) during an SSB transmission opportunity (or reception opportunity) may be determined based on time position information. In this embodiment, reception and transmission may be interchangeable.

[0055] In this embodiment, transmission (or reception) of an SSB may correspond to indication of an opportunity to transmit (or receive) the SSB. In other words, transmission (or reception) of an SSB may correspond to indication of an opportunity to transmit (or receive) the SSB without actually transmitting (or receiving) the SSB. In other words, transmission (or reception) of an SSB may correspond to indication of a candidate for transmitting (or receiving) the SSB (e.g., a candidate SSB or an index of the candidate SSB). For example, based on periodicity information, the period of the candidate for transmitting (or receiving) the SSB (i.e., the period of the opportunity to transmit (or receive) the SSB) may be indicated.

[0056] By configuring multiple SSB periods and / or multiple SSB time positions, SSBs may be transmitted in multiple transmission patterns (hereinafter referred to as SSB transmission patterns) as shown in FIG. 6 . For example, when a first SSB period among the multiple SSB periods is applied (or enabled), SSBs may be transmitted in a first SSB transmission pattern (hereinafter referred to as the first SSB transmission pattern). The first SSB transmission pattern may be a transmission pattern set by default. The first SSB transmission pattern may be set by, for example, SIB1. When a second SSB period among the multiple SSB periods is applied (or enabled), SSBs may be transmitted in a second SSB transmission pattern (hereinafter referred to as the second SSB transmission pattern). The second SSB transmission pattern may be a pattern different from the first SSB transmission pattern in the time domain. For example, the second SSB transmission pattern may be set by an RRC message (e.g., an RRC reconfiguration message). For example, as shown in FIG. 6 , in the first SSB transmission pattern, SSBs may be transmitted at a period of 20 ms or less (e.g., 10 ms), while in the second SSB transmission pattern, SSBs may be transmitted at a period of greater than 20 ms (e.g., 40 ms). That is, the SSB transmission pattern may include the SSB period and / or the time position of the SSB. The first SSB transmission pattern may also be set by an RRC message (e.g., an RRC reconfiguration message). For example, the first SSB transmission pattern may be determined based on the first periodicity information and / or the first time position information. The second SSB transmission pattern may also be determined based on the second periodicity information and / or the second time position information. That is, the first periodicity information and / or the first time position information, and the second periodicity information and / or the second time position information may be included in the RRC message. The second SSB transmission pattern may also be set by SIB1. That is, the first periodicity information and / or the first time position information, and the second periodicity information and / or the second time position information may be included in SIB1. Here, the time position information may be indicated commonly for the first SSB transmission pattern and the second SSB transmission pattern.For example, the period of the first SSB may be indicated based on first periodicity information, the period of the second SSB may be indicated based on second periodicity information, and the time position of the first SSB in the periodicity and the time position of the second SSB in the periodicity may be indicated based on one piece of time location information (e.g., first time location information). Furthermore, if the second time location information is included (i.e., exists) in SIB1 and / or an RRC message (e.g., an RRC reconfiguration message), the second time location information may be used to determine the SSB transmission pattern (i.e., the time location of the second SSB). Furthermore, if the second time location information is not included (i.e., does not exist) in SIB1 and / or an RRC message (e.g., an RRC reconfiguration message), the first time location information may be used to determine the SSB transmission pattern (i.e., the time location of the first SSB).

[0057] The predetermined information may include information indicating a timing at which one SSB period (e.g., a second SSB period) among a plurality of SSB periods (hereinafter referred to as SSB periods) is applied (or is effective). Similarly, the predetermined information may include information indicating a timing at which one time domain position among a plurality of time domain positions is applied (or is effective). The predetermined information may include information indicating a timing at which a plurality of SSB transmission patterns are switched.

[0058] The predetermined information may also include information for setting an SSB adaptation period (hereinafter referred to as SSB adaptation setting information). The SSB adaptation period may be defined by at least one of an active period and an inactive period. For example, the SSB adaptation period may be defined by at least one of an active period during which SSB is transmitted and an inactive period during which SSB is not transmitted. The SSB adaptation period may also be an SSB transmission pattern. The SSB transmission pattern may be referred to as a pattern corresponding to discontinuous transmission (DTX: Discontinuous Transmission) of SSB. For example, a periodic SSB adaptation period (e.g., an SSB transmission pattern) may be configured for each of one or more serving cells. Here, a maximum number of SSB transmission patterns configured for each of one or more serving cells may be specified. For example, it may be specified that up to two SSB transmission patterns may be configured for each of one or more serving cells.

[0059] For example, when a periodic SSB adaptation period is configured and activated, the UE 100 may assume that an SSB is transmitted. That is, when a periodic SSB adaptation period is configured and activated, the UE 100 may assume that a candidate SSB is activated (e.g., a period in which the candidate SSB is active (enabled) or a period in which the candidate SSB is transmitted). Also, when a periodic SSB adaptation period is configured and activated, the UE 100 may assume that a half frame with an SSB is activated (e.g., a period in which the half frame with an SSB is active (enabled) or a period in which the half frame with an SSB is transmitted). Also, when a periodic SSB adaptation period is configured and deactivated, the UE 100 may assume that an SSB is not transmitted. That is, when the periodic SSB adaptation period is configured and deactivated, the UE 100 may consider the candidate SSB to be deactivated (e.g., the candidate SSB is in an inactive period (disabled), or the candidate SSB is not transmitted). Also, when the periodic SSB adaptation period is configured and deactivated, the UE 100 may consider the half frame with SSB to be deactivated (e.g., the half frame with SSB is in an inactive period (disabled), or the half frame with SSB is not transmitted).

[0060] The active period may also be a period during which the UE 100 waits to receive an SSB (i.e., to receive a candidate SSB or a half frame including an SSB). The active period may also be a period during which the base station 200 transmits an SSB (i.e., to transmit a candidate SSB or a half frame including an SSB). The repetition of the active period and / or the inactive period may also be referred to as a cycle (hereinafter also referred to as a cycle (or period) of the SSB adaptation period). For example, the cycle may be used to define (i.e., set) the periodic repetition of active periods and the subsequent inactive periods. That is, the cycle may be a cycle of a period during which SSB adaptation is applied (i.e., an SSB adaptation period). The SSB adaptation setting information may include information indicating at least any of the following: - Cycle (or period) of the SSB adaptation period - Length of the SSB adaptation period - Starting position of the SSB adaptation period (e.g., subframe and / or slot offset) - Initial valid state of the SSB adaptation period - Cycle (or period) of the active and / or inactive periods - Length of the active and / or inactive periods - Starting position of the active and / or inactive periods (e.g., subframe and / or slot offset) - Initial valid state of the active and / or inactive periods

[0061] The initial valid state of the SSB adaptation period may indicate whether the SSB adaptation period is valid (state) or invalid (state) when the SSB adaptation period is set in response to reception of predetermined information (or SSB adaptation setting information). If the initial valid state of the SSB adaptation period indicates that the SSB adaptation period is valid, the control unit 120 may consider that the SSB adaptation period has started (is valid (i.e., is active)) by setting the SSB adaptation period. On the other hand, if the initial valid state of the SSB adaptation period indicates that the SSB adaptation period is invalid, the control unit 120 may consider that the SSB adaptation period has not started (is not valid, is invalid (i.e., is inactive)) even though the SSB adaptation period has been set. In this case, the control unit 120 may determine the start of the SSB adaptation period based on information indicating the start position of the SSB adaptation period.

[0062] For example, the cycle (or period) of the SSB adaptation period may be used to set the period during which SSB adaptation is applied. That is, the cycle (or period) of the SSB adaptation period may be used to set the period of the cycle during which SSB adaptation is applied. Furthermore, the length of the SSB adaptation period may be used to set the length of one period during which SSB adaptation is applied. For example, the length of the SSB adaptation period may be used to set the length of the cycle during which SSB adaptation is applied. Furthermore, the length of the SSB adaptation period may be indicated by a timer value. For example, when the SSB adaptation period starts (based on the start of the SSB adaptation period cycle), the control unit 120 may start a timer related to the length of the SSB adaptation period. Furthermore, the control unit 120 may end the SSB adaptation period when the timer set to the timer value related to the length of the SSB adaptation period expires. The start position of the SSB adaptation period may be used to set the subframe, slot, and / or symbol at which the SSB adaptation period cycle starts. The active period cycle (or period) may be used to set an active period in an SSB adaptation period (i.e., a cycle of an SSB adaptation period). Here, the active period cycle (or period) may be used to set an active period at the start of an SSB adaptation period cycle (i.e., a period from the start of an SSB adaptation period cycle). That is, the start of an SSB adaptation period may be an active period. Also, the inactive period cycle (or period) may be used to set an inactive period in an SSB adaptation period (i.e., a cycle of an SSB adaptation period). Here, the inactive period cycle (or period) may be used to set an inactive period at the start of an SSB adaptation period cycle (i.e., a period from the start of an SSB adaptation period cycle). That is, the start of an SSB adaptation period may be an inactive period. Also, the inactive period cycle (or period) may be used to set an inactive period at the end of an active period cycle (i.e., a period from the end of an active period cycle).That is, the inactive period may be a period following an active period. The length of the active period may also be used to set the length of the active period in an SSB adaptation period (i.e., an SSB adaptation period cycle). Here, the length of the active period may be used to set the length of the active period at the start of an SSB adaptation period cycle (i.e., the length from the start of the SSB adaptation period cycle). The length of the inactive period may also be used to set the length of the inactive period in an SSB adaptation period (i.e., an SSB adaptation period cycle). Here, the length of the inactive period may be used to set the length of the inactive period at the start of an SSB adaptation period cycle (i.e., the length from the start of the SSB adaptation period cycle). The length of the inactive period may also be used to set the length of the inactive period at the end of an active period cycle (i.e., the length from the end of the active period cycle). For example, the lengths of the active period and / or the inactive period may be indicated by subframes, slots, and / or symbols. The lengths of the active period and / or the inactive period may also be indicated by timer values. The control unit 120 may manage the length of the active period and / or the inactive period, similar to the SSB adaptation period. For example, when the SSB adaptation period starts (based on the start of a cycle of the SSB adaptation period), the control unit 120 may start a timer associated with the active period. Furthermore, the control unit 120 may terminate the active period based on the expiration of a timer set to a timer value associated with the active period. Furthermore, when the active period starts (based on the start of a cycle of the active period), the control unit 120 may start a timer associated with the active period. Furthermore, the control unit 120 may terminate the active period based on the expiration of a timer set to a timer value associated with the active period. Therefore, the timers for the SSB adaptation period, the active period, and / or the inactive period may be different timers.Here, a delay (delay information) may be set before the length of the active period (a timer associated with the active period) starts. That is, the control unit 120 may delay the start of the length of the active period (a timer associated with the active period) based on the delay (delay information). The start position of the active period may be used to set the subframe, slot, and / or symbol at which an active period cycle starts. The start position of the inactive period may be used to set the subframe, slot, and / or symbol at which an inactive period cycle starts. The initial valid state of the active period may be used to set whether the initial state of the active period is a valid state (i.e., active) or a invalid state (i.e., inactive) when an SSB adaptation period is set in response to reception of predetermined information (or SSB adaptation setting information).

[0063] The SSB adaptive setting information may be information for setting one or more SSB transmission patterns. The one or more SSB transmission patterns set by the SSB adaptive setting information may be valid (i.e., active) only during the SSB adaptation period. When the SSB adaptation period is disabled (i.e., inactive), SSB may not be transmitted using the SSB transmission pattern. Alternatively, when the SSB adaptation period is disabled (i.e., inactive), SSB may be transmitted using a default SSB transmission pattern. As described above, for example, a first SSB transmission pattern and / or a second SSB transmission pattern may be set as the one or more SSB transmission patterns. Furthermore, the information for setting the first SSB transmission pattern may include first periodicity information and / or first time position information. Furthermore, the information for setting the second SSB transmission pattern may include second periodicity information and / or second time position information.

[0064] As shown in FIG. 7A , the SSB adaptation period may be defined (or configured) by an active period and an inactive period. For example, SSB may be transmitted during an active period and not during an inactive period. The timing of SSB transmission may be the same as when the SSB adaptation period is valid, or may be based on SSB adaptation setting information that is applied only to the SSB adaptation period. Note that, as shown in FIG. 7A , the SSB adaptation period may be periodically repeated. For example, the control unit 120 may determine that an active period is occurring when a timer associated with the active period is running. That is, the control unit 120 may determine that an SSB is to be transmitted when a timer associated with the active period is running. Furthermore, the control unit 120 may determine that an inactive period is occurring when a timer associated with the active period is not running (or when a timer associated with the inactive period is running). That is, the control unit 120 may determine that an SSB is not to be transmitted when a timer associated with the active period is not running (or when a timer associated with the inactive period is running).

[0065] 7B, the SSB adaptation period may be defined (or configured) only by the active period. For example, when the SSB adaptation period is not in effect (i.e., not valid), SSB may be transmitted using the first SSB transmission pattern. On the other hand, when the SSB adaptation period is in effect (i.e., valid), SSB may be transmitted using the second SSB transmission pattern.

[0066] 7C, the SSB adaptation period may be defined (or configured) solely by the inactive period. For example, if the SSB adaptation period is not in effect (i.e., not valid), SSB may be transmitted. On the other hand, if the SSB adaptation period is in effect (i.e., valid), SSB may not be transmitted.

[0067] The predetermined information may include information related to cell DTX (Discontinuous Transmission). For example, the predetermined information may include configuration information used to set cell DTX (Discontinuous Transmission) / DRX (Discontinuous Reception) related parameters (hereinafter, cell DTX / DRX configuration information (e.g., CellDTX-DRX-Config)). At least any of the information set as cell DTX parameters included in the configuration information may be used as information for setting SSB adaptation.

[0068] The cell DTX parameters may include, for example, at least one of the following information: information regarding the cell DTX cycle (e.g., cellDTX-DRX-CycleStartOffset) as information indicating the cycle or period of the SSB adaptation period; information regarding the cell DTX start offset (e.g., cellDTX-DRX-CycleStartOffset) and / or information regarding the cell DTX slot offset (e.g., cellDTX-DRX-SlotOffset) as information indicating the start position of the SSB adaptation period; and a timer value regarding cell DTX (e.g., cellDTX-DRX-onDurationTimer) as information indicating the length of the SSB adaptation period and / or active period. Furthermore, the cell DTX parameters may include information indicating whether the cell DTX is one in which SSB adaptation is performed, such as DTX only (e.g., dtx), DRX only (e.g., drx), DTX and DRX (e.g., dtx drx) in which SSB adaptation is not performed, DTX only (e.g., ssb-dtx), or DTX and DRX (e.g., ssb-dtxdrx) in which SSB adaptation is performed. This information indicates the type of cell DTX configuration (e.g., cellDTX-DRX-ConfigType). That is, common information (parameters) may be set for the SSB adaptation period and the cell DTX period. Here, some information (parameters) may be set independently for the SSB adaptation period and the cell DTX period, and other information (parameters) may be set in common.

[0069] Step S102: The control unit 120 of the UE 100 may identify the reception timing of the SSB based on predetermined information. The control unit 120 may identify the reception timing of the SSB based on, for example, periodicity information. The control unit 120 may identify the period of the SSB based on the periodicity information. The control unit 120 may identify the reception timing of the SSB based on information indicating the subcarrier spacing of the SSB. Also, as described above, the control unit 120 may determine the starting symbol position of the candidate SSB within the half frame (e.g., the index of the first symbol of the candidate SSB) based on, for example, the information indicating the subcarrier spacing of the SSB. The control unit 120 may identify the reception timing of the SSB based on time position information. The control unit 120 may identify, for example, the position of the SSB in the time domain (SSB burst). The control unit 120 may identify the reception timing of the SSB based on at least one of the period of the SSB, the starting symbol position of the candidate SSB, and the time position of the SSB.

[0070] The control unit 120 may determine the SSB reception timing based on information about the cell DTX included in the predetermined information. The control unit 120 may determine the cycle or period of the SSB adaptation period based on, for example, cell DTX parameters (e.g., information about the cell DTX cycle). The control unit 120 may determine the start position of the SSB adaptation period based on information about the cell DTX start offset and / or information about the cell DTX slot offset. The control unit 120 may determine the length of the SSB adaptation period and / or the active period based on a timer value related to the cell DTX (e.g., cellDTX-DRX-onDurationTimer). Furthermore, the control unit 120 may determine whether the cell DTX parameters are used to determine the SSB reception timing based on information indicating the setting type related to the cell DTX.

[0071] The control unit 120 may identify one or more SSB transmission patterns based on predetermined information. The control unit 120 may identify SSB reception timings based on the identified SSB transmission patterns. Note that the SSB transmission pattern may be the SSB reception pattern in the UE 100. Therefore, the control unit 120 may regard the transmission pattern as the reception pattern.

[0072] The control unit 120 may identify the SSB adaptation period based on predetermined information. As shown in FIG. 7A , the control unit 120 may determine that an SSB reception timing exists during an active period in the SSB adaptation period, and may determine that an SSB reception timing does not exist during an inactive period in the SSB adaptation period. Alternatively, the control unit 120 may determine that an SSB reception timing exists during the SSB adaptation period, i.e., an active period, as shown in FIG. 7B . Alternatively, the control unit 120 may determine that an SSB reception timing does not exist during the SSB adaptation period, i.e., an inactive period, as shown in FIG. 7C . Outside the SSB adaptation period, the control unit 120 may determine the SSB reception timing according to, for example, a default SSB transmission pattern.

[0073] Note that multiple SSB transmission patterns may be switched during an SSB adaptation period (e.g., an active period of the SSB adaptation period). Therefore, the control unit 120 may identify multiple SSB transmission patterns during (the active period of) the SSB adaptation period. On the other hand, outside the SSB adaptation period, the control unit 120 may identify SSB reception timing according to a single SSB transmission pattern (e.g., a default SSB transmission pattern). That is, multiple SSB transmission patterns may be set for one active period of the SSB adaptation period. The control unit 120 may control SSB reception by switching between multiple SSB transmission patterns set for one active period (e.g., two SSB transmission patterns set for one serving cell).

[0074] The control unit 120 may specify a period during which the SSB is not transmitted (hereinafter, referred to as a non-transmission period). The control unit 120 may specify the non-transmission period based on predetermined information. The specified non-transmission period may be set in the UE 100. Therefore, the control unit 120 may perform control so that the non-transmission period is set based on the predetermined information.

[0075] Here, when multiple transmission patterns are set based on predetermined information, the non-transmission period may be a period during which SSBs are not transmitted using an applied transmission pattern (e.g., the second SSB transmission pattern in FIG. 6 ) but includes a period during which SSBs are transmitted using a non-applied transmission pattern (e.g., the first SSB transmission pattern in FIG. 6 ). The non-transmission period may be the entire period during which SSBs are not transmitted using the applied transmission pattern. For example, the non-transmission period may be the period from after an SSB transmission timing using the applied transmission pattern to before the next SSB transmission timing. Alternatively, the non-transmission period may be only the period during which SSBs are not transmitted using the second SSB transmission pattern that overlaps with a period during which SSBs are transmitted using the first SSB transmission pattern. Note that the first SSB transmission pattern may be a default SSB transmission pattern (e.g., an existing SSB transmission pattern set in SIB1).

[0076] Furthermore, as shown in Figures 7A and 7C, when an SSB adaptation period is set, the non-transmission period may be the entire inactive period. Furthermore, the non-transmission period may be a period during the inactive period that overlaps with a timing when SSB is transmitted outside the SSB adaptation period (e.g., the "no SSB transmission" (dotted line portion) in Figures 7A and 7C). Alternatively, the non-transmission period may be a period during the active period that includes a timing (period) when SSB is transmitted outside the SSB adaptation period, as shown in Figure 7B. The non-transmission period may be a period during the active period from after an SSB transmission timing to before the next SSB transmission timing. Furthermore, the non-transmission period may be a period during the active period that overlaps with a timing when SSB is transmitted outside the SSB adaptation period.

[0077] In this manner, the control unit 120 may identify periods during which SSB is not transmitted (i.e., non-transmission periods) during the SSB adaptation period. The control unit 120 may identify active periods as periods during which SSB is transmitted and inactive periods as non-transmission periods.

[0078] The control unit 120 may also assume that SSB will be transmitted during the active period. The control unit 120 may also assume that SSB will not be transmitted during the inactive period. The control unit 120 may also assume that SSB will be transmitted during the active period based on predetermined information (e.g., periodicity information and / or time position information). The control unit 120 may also assume that SSB will be transmitted during the active period in an SSB transmission pattern based on the predetermined information.

[0079] Step S103: The control unit 230 of the base station 200 may control SSB transmission. The transmission unit 211 of the base station 200 may periodically transmit the SSB.

[0080] The receiving unit 112 of the UE 100 may receive the SSB from the cell. The control unit 120 of the UE 100 may control the SSB reception based on predetermined information. The control unit 120 may control the SSB reception based on the reception timing of the SSB identified in step S102. For example, the control unit 120 may perform at least one of a cell search procedure, radio signal measurement, and beam obstruction detection based on the SSB. That is, the control unit 120 may perform at least one of a cell search procedure, radio signal measurement, and beam obstruction detection according to the SSB received based on the SSB adaptive setting information. Furthermore, when the SSB adaptive setting information is set, the control unit 120 may perform at least one of a cell search procedure, radio signal measurement, and beam obstruction detection according to the SSB received during the active period. Furthermore, the control unit 120 may not execute (may skip) at least one of the cell search procedure, the radio signal measurement, and the beam obstruction detection based on the SSB adaptive setting information. When the SSB adaptive setting information is set, the control unit 120 may not execute (may skip) at least one of the cell search procedure, the radio signal measurement, and the beam obstruction detection during the inactive period.

[0081] Here, SSB adaptation (e.g., SSB adaptation setting information) may only affect any of the cell search procedure, radio signal measurement, and beam interference detection. In other words, SSB adaptation (e.g., SSB adaptation setting information) may not affect any of the cell search procedure, radio signal measurement, and beam interference detection. For example, the control unit 120 may apply SSB adaptation (e.g., SSB adaptation setting information) only to any of the cell search procedure, radio signal measurement, and beam interference detection. Furthermore, the control unit 120 may not apply SSB adaptation (e.g., SSB adaptation setting information) to any of the cell search procedure, radio signal measurement, and beam interference detection. For example, the control unit 120 may always perform the cell search procedure based on the first SSB transmission pattern without applying SSB adaptation (e.g., SSB adaptation setting information). Alternatively, the control unit 120 may always measure the radio signal based on the first SSB transmission pattern without applying SSB adaptation (e.g., SSB adaptation setting information). Alternatively, the control unit 120 may always detect beam obstructions based on the first SSB transmission pattern without applying SSB adaptation (e.g., SSB adaptation setting information).

[0082] In this operation example, the description will be given assuming that transmitter 211 of base station 200 periodically transmits SSBs in the first SSB transmission pattern, and controller 120 of UE 100 periodically receives SSBs in the first SSB transmission pattern (or the first SSB reception pattern).

[0083] Step S104: The control unit 120 of the base station 200 may control SSB transmission, similar to step S103. The control unit 120 of the base station 200 may periodically transmit SSB using a transmission pattern different from that of step S102. The receiving unit 112 of the UE 100 may receive SSB from the cell, similar to step S103. The control unit 120 of the UE 100 may control SSB reception based on predetermined information.

[0084] In this operation example, the description will proceed assuming that the transmitter 211 of the base station 200 periodically transmits SSBs in the second SSB transmission pattern, and the controller 120 of the UE 100 periodically receives SSBs in the second SSB transmission pattern (or the second SSB reception pattern).

[0085] The control unit 120 of the UE 100 may execute the process of step S105 when uplink transmission (i.e., data or control information to be transmitted in the uplink) occurs. On the other hand, when uplink transmission does not occur, the operation of step S104 may be continued. Here, the data to be transmitted in the uplink may include an uplink shared channel (UL-SCH). The UL-SCH may be mapped to a physical uplink shared channel (PUSCH). In addition, the control information to be transmitted in the uplink is also referred to as uplink control information (UCI). The UCI may be mapped to a Physical Uplink Control Channel (PUCCH). Furthermore, the uplink transmission may include transmission of a Sounding Reference Signal (SRS). Here, the uplink transmission may not include transmission of a Physical Random Access Channel (PRACH). That is, the uplink transmission may include transmission on a PUSCH, transmission on a PUCCH, and / or transmission of an SRS. Furthermore, the uplink transmission may include uplink transmissions other than transmission on a PRACH. The uplink transmission may include transmission on a PRACH.

[0086] Step S105: The control unit 120 of the UE 100 may perform a determination of uplink transmission. Specifically, the control unit 120 may determine whether or not to perform uplink transmission. The control unit 120 may perform this determination when the UE 100 is operating with a single carrier in an unpaired spectrum. The control unit 120 may perform this determination when TDD is configured for the UE 100. The control unit 120 may perform the determination according to, for example, the process shown in FIG. 8.

[0087] Step S151: The control unit 120 may determine whether the timing of uplink transmission overlaps with the SSB reception timing. If the timing of uplink transmission overlaps with the SSB reception timing, the control unit 120 may execute the process of step S152. On the other hand, if the timing of uplink transmission does not overlap with the SSB reception timing, the control unit 120 may execute the process of step S154. Here, the timing of uplink transmission overlapping with the SSB reception timing may include the subframe, slot, and / or symbol in which uplink transmission is performed overlapping with the subframe, slot, and / or symbol in which SSB reception is performed. That is, in this embodiment, the timing overlapping may include the overlapping of positions in the time domain (e.g., resources in the time domain) partially or entirely. That is, the timing overlapping may include the overlapping of subframes, slots, and / or symbols partially or entirely.

[0088] The control unit 120 may determine that the timing of the uplink transmission overlaps with the SSB reception timing when, for example, the timing of the uplink transmission overlaps with at least one of the symbol sets of the slot designated for SSB reception based on the predetermined information. On the other hand, the control unit 120 may determine that the timing of the uplink transmission does not overlap with the SSB reception timing when, for example, the timing of the uplink transmission overlaps with any of the symbol sets designated for SSB reception based on the predetermined information.

[0089] Here, as described above, the uplink transmission may be transmission on any of the PUSCH, PUCCH, and PRACH, or may be transmission of an SRS.

[0090] If the control unit 120 has identified a non-transmission period, it may execute the process of step S152. Alternatively, the control unit 120 may execute the process of step S152 after identifying a non-transmission period. Alternatively, if the control unit 120 has not identified a non-transmission period, it may execute the process of step S153. If the SSB reception timing is a non-transmission period (e.g., it is considered to be a non-transmission period), the control unit 120 may execute the process of step S153.

[0091] Step S152: The control unit 120 may determine whether the timing of the uplink transmission overlaps with the non-transmission period. If the timing of the uplink transmission overlaps with the non-transmission period, the control unit 120 may execute the process of step S153. If the timing of the uplink transmission does not overlap with the non-transmission period, the control unit 120 may execute the process of step S154.

[0092] Step S153: The control unit 120 may perform control to perform uplink transmission. Therefore, for example, even if a set of symbols of a slot indicated to the UE 100 for receiving an SSB by the ssb-PositionsInBurst in SIB1 or the ssb-PositionsInBurst in ServingCellConfigCommon overlaps with a slot of uplink transmission, the control unit 120 may perform uplink transmission as long as the slot of uplink transmission is within a non-transmission period.

[0093] Step S154: The control unit 120 may control not to perform uplink transmission. The transmitter 111 may not perform uplink transmission. Therefore, the control unit 120 may control not to perform uplink transmission when the timing of uplink transmission to a cell overlaps with the timing of SSB reception, except during the non-transmission period. The control unit 120 may also suspend (or cancel or skip) uplink transmission. For example, the control unit 120 may control whether to perform uplink transmission based on SSB adaptive setting information. For example, when the SSB adaptive setting information is configured, the control unit 120 may perform control to determine whether the timing of uplink transmission and the timing of SSB reception overlap during the active period. Furthermore, when the SSB adaptive setting information is configured, the control unit 120 may not perform control to determine whether the timing of uplink transmission and the timing of SSB reception overlap during the inactive period. For example, when the SSB adaptive setting information is set, the control unit 120 may perform control to always execute uplink transmission during the inactive period. When the SSB adaptive setting information is set, the control unit 120 may perform control to always execute uplink transmission during the period excluding the active period.

[0094] For example, when the uplink transmission is a PUSCH transmission, a PUCCH transmission, and / or a PRACH transmission, the control unit 120 may not perform the uplink transmission in the slot indicated to the UE 100 for receiving the SSB. The control unit 120 may perform the uplink transmission in another slot.

[0095] For example, when the uplink transmission is an SRS transmission, the control unit 120 may not perform the uplink transmission in the set of symbols of the slot indicated to the UE 100 for reception of the SSB. The control unit 120 may perform the SRS transmission as the uplink transmission in other symbols.

[0096] In addition, the control unit 120 may execute the process of step S154 when the UE 100 operates with a single carrier in an unpaired spectrum. In addition, the control unit 120 may execute the process of step S154 when TDD is configured in the UE 100. In addition, the control unit 120 may perform control to receive the SSB at the reception timing of the SSB.

[0097] Step S106: The transmitter 111 may perform uplink transmission. Thereafter, the control unit 120 may determine, based on predetermined information, that the SSB is to be transmitted in the first SSB transmission pattern, for example.

[0098] Step S107: corresponds to step S103.

[0099] As described above, the transmitter 211 of the base station 200 may receive, from a cell that supports SSB adaptation, predetermined information for specifying the reception timing of SSB for the UE 100. The receiver 112 of the UE 100 may receive, from a cell that supports SSB adaptation, predetermined information for specifying the reception timing of SSB. The controller 120 may specify a period during which SSB is not transmitted based on the predetermined information. The predetermined information may be used to specify a period during which SSB is transmitted in the UE 100. This enables the network 10 to allow the UE 100 to ascertain a period during which SSB, which is normally transmitted periodically, is not transmitted. As a result, when SSB is adaptively transmitted in the time domain, the operation of the UE 100 becomes clear, and the UE 100 can perform appropriate operation.

[0100] Furthermore, the control unit 120 of the UE 100 may perform control so as not to perform uplink transmission when the timing of uplink transmission to a cell overlaps with the timing of receiving an SSB, except for a non-transmission period in which the SSB is not transmitted. As a result, the UE 100 can perform operations similar to those of the existing mobile communication system 1 when the timing of uplink transmission overlaps with the timing of receiving an SSB, except for a non-transmission period.

[0101] The predetermined information may include at least one of period information for setting a plurality of periods as the period of the SSB and time position information for setting a plurality of time positions as the position of the SSB in the time domain. This allows the UE 100 to grasp the period and / or the time position of the SSB adaptively transmitted in the time domain based on the information.

[0102] Furthermore, the predetermined information may include information for setting an SSB adaptation period defined by at least one of an active period during which SSB is transmitted and an inactive period during which SSB is not transmitted. The control unit 120 may specify a period during which SSB is not transmitted in the SSB adaptation period. This allows the control unit 120 to specify a non-transmission period during the SSB adaptation period when the SSB adaptation period is set, thereby clarifying the operation of the UE 100 and enabling the UE 100 to perform appropriate operation when SSB is adaptively transmitted in the time domain.

[0103] Furthermore, the control unit 120 may specify the active period as a period during which the SSB is transmitted and the inactive period as a period during which the SSB is not transmitted, thereby clarifying the operation of the UE 100 and enabling the UE 100 to perform appropriate operation when the SSB is adaptively transmitted in the time domain.

[0104] (Second Operation Example) A second operation example will be described with reference to Fig. 9. Previous descriptions may be omitted. In this operation example, a case will be described in which downlink control information (DCI) includes predetermined information. Note that DCI may be referred to as (i.e., may be replaced with) a DCI format.

[0105] Step S201: As in the first operation example, the transmitter 211 of the base station 200 may transmit an RRC message including predetermined information for identifying the reception timing of the SSB to the UE 100. The receiver 112 of the UE 100 may receive the RRC message from the base station 200 (cell).

[0106] The predetermined information may or may not include the same information as in the first operation example. The predetermined information may include information different from that in the first operation example. The predetermined information may include at least one of the following information. Details of each piece of information will be described later. Information for setting whether a field related to SSB adaptation is present in the DCI Information indicating the starting position of the field related to SSB adaptation Information indicating the size of the DCI (or DCI format) Information for setting a specific Radio Network Temporary Identifier (RNTI) for a DCI including the predetermined information Information for monitoring a DCI including the predetermined information

[0107] The control unit 120 may determine whether a field related to SSB adaptation is present in the DCI received from the cell based on information for setting whether the field is present in the DCI. The information may indicate whether the serving cell has enabled SSB adaptation based on the DCI. For example, if the information indicates that the field is present in the DCI (or if the serving cell has enabled SSB adaptation based on the DCI), the control unit 120 may perform reception processing for the DCI including the predetermined information. On the other hand, if the information indicates that the field is not present in the DCI (or if the serving cell has not enabled SSB adaptation based on the DCI), the control unit 120 may not perform the processing of steps S203 and S204. In this case, the control unit 120 may perform reception processing for the SSB based on predetermined information (hereinafter, sometimes referred to as first predetermined information) included in the RRC message. Here, the information for setting whether the field related to SSB adaptation is present in the DCI may be SSB adaptation setting information. That is, when at least one piece of information included in the above-described SSB adaptation setting information is set, the control unit 120 may determine that the DCI (or the DCI format) includes a field related to SSB adaptation (i.e., a field related to SSB adaptation is present). Here, information for determining the number of bits of the field related to SSB adaptation may be transmitted. For example, the information for determining the number of bits of the field related to SSB adaptation may be SSB adaptation setting information. Furthermore, the information for determining the number of bits of the field related to SSB adaptation may be information for setting one or more SSB transmission patterns. The control unit 120 may determine the number of bits of the field related to SSB adaptation based on the number of pieces of information for setting SSB transmission patterns. For example, when information for setting a first SSB transmission pattern (e.g., first periodicity information and / or first time position information) is set, the control unit 120 may determine the number of bits of the field related to SSB adaptation to be 1 bit (or 0 bit).Furthermore, when information for setting a first SSB transmission pattern (e.g., first periodic information and / or first time position information) and information for setting a second SSB transmission pattern (e.g., second periodic information and / or second time position information) are set, the control unit 120 may determine the number of bits in the field related to SSB adaptation as 2 bits (or 1 bit). Here, the number of bits in the field related to SSB adaptation may always be 1 bit.

[0108] Step S202: As in the first operation example, the control unit 120 of the UE 100 may identify the reception timing of the SSB based on predetermined information. Furthermore, the control unit 120 may receive DCI based on information included in the predetermined information in step S201. Details will be described later. The DCI may be DCI format 2_9 or a new DCI format. DCI format 2_9 may be used to activate or deactivate the cell DTX setting and / or the cell DRX setting. That is, DCI format 2_9 may be used to activate or deactivate the cell DTX setting and / or the cell DRX setting for one or more serving cells. For example, a cell DTX / DRX indication indicating activation and / or deactivation of cell DTX (cell DTX setting) may be included in DCI format 2_9 with a cyclic redundancy check (CRC and / or CRC parity bit) scrambled by the cell DTRX-RNTI. Furthermore, a primary cell NES mode indication for one or more UEs 100 may be included in DCI format 2_9 with a CRC scrambled by the cell DTRX-RNTI. Here, the cell DTX / DRX indication may be used to indicate activation and / or deactivation of cell DRX (cell DRX setting). That is, if DCI format 2_9 includes a field related to SSB adaptation (if a field related to SSB adaptation exists), the field related to SSB adaptation may be included in DCI format 2_9 together with the information. For example, one DCI format 2_9 may be used to control the setting of cell DTX and / or the setting of cell DRX, as well as the control of SSB adaptation (i.e., the setting of the SSB adaptation period).

[0109] Step S203: The transmitting unit 211 of the base station 200 may transmit DCI including the specified information to the UE 100. The receiving unit 112 of the UE 100 may receive the DCI including the specified information from the cell. The control unit 120 may perform a reception process for the DCI based on the specified information received in step S201. Furthermore, the transmitting unit 211 of the base station 200 may transmit an RRC message (e.g., SIB1 and / or an RRC reconfiguration message) including the specified information to the UE 100. The receiving unit 112 of the UE 100 may receive the RRC message (e.g., SIB1 and / or an RRC reconfiguration message) including the specified information from the cell.

[0110] The control unit 120 may monitor DCI based on information for monitoring DCI, which includes predetermined information. The control unit 120 may monitor DCI in a search space (or search space set) indicated by the information. Here, the information for monitoring DCI (hereinafter, DCI monitoring information) may be information for setting for a downlink bandwidth portion (BWP) of a cell (i.e., for each downlink BWP). For example, the search space (or search space set) indicated by the DCI monitoring information may be set for each downlink BWP. The control unit 120 may monitor DCI based on information corresponding to the downlink BWP to be monitored among one or more pieces of DCI monitoring information. Note that information other than the DCI monitoring information included in the predetermined information may be set for the serving cell (i.e., for each serving cell). For example, the transmitter 211 of the base station 200 may transmit to the UE 100 an RRC message (e.g., SIB1 and / or an RRC reconfiguration message) including information for configuring a search space for monitoring the DCI (or the DCI format). The control unit 120 of the UE 100 may monitor the DCI (or the DCI format) based on the search space configured based on the information for configuring the search space. Here, the information for configuring the search space may be configured for each of one or more downlink BWPs. Here, the DCI (or the DCI format) may be a DCI (or a DCI format) that includes at least a field related to SSB adaptation. That is, a search space may be configured for the DCI (or the DCI format) that includes at least a field related to SSB adaptation.

[0111] A specific RNTI may be added to the DCI (and / or the PDCCH). A cyclic redundancy check (CRC and / or CRC parity bit) scrambled by the specific RNTI may be added to the DCI (and / or the PDCCH). In this case, the control unit 120 may monitor the DCI based on information for setting the specific RNTI. For example, the control unit 120 may monitor the PDCCH (DCI) with a CRC scrambled by the specific RNTI set based on the information. If the control unit 120 successfully decodes the PDCCH with a CRC scrambled by the specific RNTI, the control unit 120 may determine that the DCI including the specified information has been received. On the other hand, if the control unit 120 fails to decode the PDCCH with a CRC scrambled by the specific RNTI, the control unit 120 may determine that the DCI including the specified information has not been received.

[0112] The control unit 120 may identify the predetermined information included in the DCI (hereinafter, sometimes referred to as second predetermined information) based on the information included in the first predetermined information.

[0113] The control unit 120 may identify the size of the DCI or the DCI format based on the information indicating the size of the DCI or the DCI format. The control unit 120 may decode the PDCCH based on the size. The control unit 120 may identify and read the position of each field in the DCI, for example, a field related to SSB adaptation, based on the size of the DCI.

[0114] The control unit 120 may identify the start position of the field related to SSB adaptation in the DCI based on the information indicating the start position of the field. Here, the start position may be, for example, the position of one or more blocks configured for the UE. The one or more blocks may be associated with the serving cell. The control unit 120 may identify the start position of the field including the second predetermined information based on the first predetermined information.

[0115] The field related to SSB adaptation may include a field indicating whether SSB adaptation is enabled (hereinafter, referred to as an SSB adaptation indication field). This field or the information (value) set in this field may be predetermined information. Therefore, the control unit 120 may identify the start position of the SSB adaptation indication field based on the information indicating the start position of the field related to SSB adaptation.

[0116] The control unit 120 may determine that SSB adaptation is enabled when a value (e.g., "1") corresponding to enabled (e.g., "enable" or "active") is set in the SSB adaptation indication field. On the other hand, the control unit 120 may determine that SSB adaptation is enabled when a value (e.g., "1") corresponding to enabled (e.g., "enable" or "active") is set. On the other hand, the control unit 120 may determine that SSB adaptation is disabled when a value (e.g., "0") corresponding to disabled (e.g., "disable" or "inactive") is set in the SSB adaptation indication field. For example, a value of "1" for a bit in the SSB adaptation indication field may indicate that the SSB adaptation period (i.e., the cycle of the SSB adaptation period) is enabled (i.e., activated). That is, the control unit 120 may start the SSB adaptation period (i.e., the cycle of the SSB adaptation period) based on the value of "1" set in the SSB adaptation indication field. The control unit 120 may also start an SSB transmission pattern based on a value of "1" set in the SSB adaptation indication field. A value of "0" for a bit in the SSB adaptation indication field may indicate that the SSB adaptation period (i.e., the cycle of SSB adaptation periods) is disabled (i.e., deactivated). That is, the control unit 120 may end an SSB adaptation period (i.e., the cycle of SSB adaptation periods) based on a value of "0" set in the SSB adaptation indication field. The control unit 120 may also end an SSB transmission pattern based on a value of "0" set in the SSB adaptation indication field.

[0117] Also, for example, a value of "1" for a bit in the SSB adaptation indication field may indicate activation of an active period (i.e., a cycle of active periods). That is, the control unit 120 may start an active period (i.e., a cycle of active periods) based on a value of "1" set in the SSB adaptation indication field. Also, the control unit 120 may start an SSB transmission pattern in an active period based on a value of "1" set in the SSB adaptation indication field. Also, a value of "0" for a bit in the SSB adaptation indication field may indicate deactivation of an active period (i.e., a cycle of active periods). That is, the control unit 120 may end an active period (i.e., a cycle of active periods) based on a value of "0" set in the SSB adaptation indication field. Also, the control unit 120 may end an SSB transmission pattern in an active period based on a value of "0" set in the SSB adaptation indication field. Also, a value of "0" for a bit in the SSB adaptation indication field may indicate activation of an inactive period (i.e., a cycle of inactive periods). That is, the control unit 120 may start an inactive period (i.e., a cycle of inactive periods) based on the value of "0" set in the SSB adaptation indication field. Also, the control unit 120 may determine that SSB will not be transmitted during the inactive period based on the value of "0" set in the SSB adaptation indication field.

[0118] The SSB adaptation field may include information (values) corresponding to the predetermined information (or at least some of the information included therein) described in the first operation example. For example, the DCI may include a field in which a value indicating one or more SSB periods and / or one or more SSB time positions is set. For example, when "0" is set in this field, the value may indicate the period (or period information) and / or the time position (or time position information) of the first SSB. When "1" is set in this field, the value may indicate the period (or period information) of the second SSB and / or the time position of the second SSB. A table corresponding to the field values ​​may be predefined. The control unit 120 stores this table and may consider that the SSB period and / or the SSB time position corresponding to the field value has been set. For example, the value for a bit in the SSB adaptation indication field may correspond to one piece of period information (and / or one piece of time position information) among one or more pieces of period information (and / or one piece of time position information). The control unit 120 may determine the period (and / or time position) of the SSB in the active period based on the values ​​for the bits of the SSB adaptation indication field.

[0119] The SSB adaptation field may include information corresponding to an SSB transmission pattern and / or SSB adaptation setting information. The DCI may include a field in which a value indicating one or more SSB transmission patterns and / or one or more SSB adaptation setting information is set. For example, when the field is set to "0," a first SSB transmission pattern and / or first SSB adaptation setting information may be indicated. When the field is set to "1," a second SSB transmission pattern and / or second SSB adaptation setting information may be indicated. A table corresponding to the field values ​​may be predefined. The control unit 120 stores the table and may consider that the SSB transmission pattern and / or SSB adaptation setting information corresponding to the field value is set. For example, a value corresponding to a bit in the SSB adaptation indication field may correspond to one transmission pattern among one or more SSB transmission patterns. The control unit 120 may determine the SSB transmission pattern during the active period based on the value corresponding to the bit in the SSB adaptation indication field.

[0120] Step S204: The control unit 120 of the UE 100 may specify the reception timing of the SSB based on the second predetermined information (and the first predetermined information). The control unit 120 may specify the reception timing of the SSB, similar to step S102.

[0121] Steps S205 to S209 correspond to steps S103 to S107.

[0122] Note that, after specifying the SSB reception timing based on the predetermined information included in the RRC message, if the control unit 120 of the UE 100 receives DCI including the predetermined information (i.e., second predetermined information), the control unit 120 may execute the SSB reception process at the SSB reception timing specified based on the second predetermined information. Therefore, the control unit 120 may prioritize the predetermined information included in the DCI over the predetermined information included in the RRC message. This enables the predetermined information to be dynamically sent from the base station 200 to the UE 100, thereby enabling flexible control of SSB adaptation.

[0123] As described above, the receiver 112 of the UE 100 may receive, from the cell, downlink control information (DCI) including information indicating whether the SSB adaptation period is enabled. This allows the network 10 to dynamically control whether the SSB adaptation period is enabled, thereby enabling flexible control of SSB adaptation.

[0124] Furthermore, the receiver 112 may receive DCI including predetermined information from the cell, which allows the base station 200 to dynamically send the predetermined information to the UE 100, thereby enabling flexible control of SSB adaptation.

[0125] The receiver 112 may also receive information from the cell for setting a search space for monitoring downlink control information including predetermined information in the downlink bandwidth portion of the cell. This allows for setting for each downlink BWP, thereby enabling adaptive transmission of SSBs in the time domain for each downlink BWP. This allows for energy savings in the network 10.

[0126] (Third Operation Example) A third operation example will be described with reference to Fig. 10. Previous descriptions may be omitted. In this operation example, a case will be described in which, like the first operation example, multiple SSB transmission patterns are set by an RRC message, and the multiple transmission patterns can be switched by DCI.

[0127] Step S301: Corresponds to steps S101 and S201.

[0128] The transmitting unit 211 of the base station 200 may transmit to the UE 100 via an RRC message predetermined information including at least one of period information for setting multiple periods as the period of the SSB and time position information for setting multiple time positions as the position of the SSB in the time domain.

[0129] Steps S302 and S303: correspond to steps S102 and S103.

[0130] The control unit 230 of the UE 100 may specify the SSB reception timing based on predetermined information so as to receive the SSB at any one of a plurality of periods and / or at any one of a plurality of time positions.

[0131] Steps S304 and S305: correspond to steps S203 and S204.

[0132] The control unit 230 of the base station 200 may include, as the predetermined information, at least one of information indicating one of a plurality of periodicities and information indicating one of a plurality of time positions of the SSBs in the DCI (DCI format). The transmission unit 211 of the base station 200 may transmit the DCI including the predetermined information to the UE 100. The reception unit 112 of the UE 100 may receive the DCI including the predetermined information from the cell.

[0133] Here, when the predetermined information includes information indicating one of a plurality of periods, the DCI may include a field with a number of bits corresponding to the number of the plurality of periods. When the predetermined information includes information indicating one of a plurality of time positions, the DCI may include a field with a number of bits corresponding to the number of the plurality of time positions. For example, the control unit 230 of the base station 200 may set a predetermined value (e.g., "1") in a field corresponding to a period among the plurality of periods to which the UE 100 should apply, and may set a value other than the predetermined value (e.g., "0") in fields corresponding to the other periods. The control unit 230 may perform similar control with respect to the time positions.

[0134] The control unit 120 of the UE 100 may specify at least one of the SSB period and the position of the SSB in the time domain based on the DCI. The control unit 120 may, for example, determine the number of bits of information indicating one of the multiple periodicities according to the number of multiple periodicities set by the periodicity information included in the RRC message. The control unit 120 may specify at which SSB period the SSB is transmitted based on values ​​of fields corresponding to each of the multiple periodicities (e.g., predetermined values ​​indicating the periodicity to be applied by the UE 100). The control unit 120 may perform similar control with respect to the time position. Similarly, the control unit 120 may specify which SSB transmission pattern to apply among multiple SSB transmission patterns, which SSB adaptive setting information to apply among multiple SSB adaptive setting information, etc., based on predetermined information included in the DCI.

[0135] In this way, the control unit 120 may specify the reception timing of the SSB based on the value set in the field of the DCI. Specifically, the control unit 120 may specify information to be applied to the UE 100 based on predetermined information included in the DCI, and specify the reception timing of the SSB. As a result, the SSB transmission pattern may be switched by the DCI including the predetermined information. For example, as shown in FIG. 10 , the base station 200 may transmit SSB in a cell using a first SSB transmission pattern set by an RRC message, and then, after transmitting the DCI, transmit SSB using a second SSB transmission pattern set (specified) by the DCI.

[0136] Note that the DCI may be DCI format 2_9, as in the second operation example, or may be a new DCI format. DCI format 2_9 may be a DCI format used to activate or deactivate cell DTX and / or DRX settings of one or more serving cells and / or to provide an NES mode indication to the UE. Therefore, the cell DTX / DRX indication and the NES mode indication may be specified in the DCI field including the predetermined information.

[0137] Steps S306 to S308: correspond to steps S206 to S208.

[0138] As described above, the receiver of UE 100 may receive downlink control information from a cell, the downlink control information including at least one of information indicating one of a plurality of periods and information indicating one of a plurality of time positions. The controller 120 may specify at least one of the SSB period and the position of the SSB in the time domain by the DCI. This allows the SSB period and the SSB time domain to be controlled more dynamically than RRC, enabling more flexible control of SSB adaptation.

[0139] Furthermore, when the predetermined information includes information indicating a period, the DCI may include a field with a number of bits corresponding to the number of multiple periods. When the predetermined information includes information indicating a time position, the DCI may include a field with a number of bits corresponding to the number of multiple time positions. This eliminates the need to explicitly indicate the number of bits of the field included in the DCI, making it possible to reduce the amount of information.

[0140] (Other Embodiments) In the above-described second and third operation examples, DCI has been described as an example, but MAC CE may also be used. Therefore, the above-described DCI may be replaced with MAC CE. MAC CE can include more information than DCI, which allows for more flexible control of SSB adaptation.

[0141] In each of the above-described operation examples, "transmission" of SSB may be replaced with "reception" of SSB in the UE 100. For example, a transmission pattern of SSB may be replaced with a reception pattern of SSB. Furthermore, "active" and "enable" may be replaced with each other, and "inactive" and "disable" may be replaced with each other.

[0142] In the above-described embodiment, an NR-based mobile communication system has been described as an example of the mobile communication system 1. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a system compliant with the TS of either LTE or another generation system (e.g., 6th generation) of the 3GPP standard. The base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol termination toward the UE 100 in LTE. The mobile communication system 1 may be a system compliant with the TS of a standard other than the 3GPP standard. The base station 200 may be an IAB (Integrated Access and Backhaul) donor or an IAB node.

[0143] In the above-described embodiment, an NR-based mobile communication system has been described as an example of the mobile communication system 1. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a system conforming to the TS of either LTE or another generation system (e.g., 6th generation) of the 3GPP standard. The base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol termination for the UE 100 in LTE. The mobile communication system 1 may be a system conforming to the TS of a standard other than the 3GPP standard.

[0144] The steps in the operations of the above-described embodiments do not necessarily have to be executed in chronological order according to the order depicted in the flow diagrams or sequence diagrams. For example, the steps in the operations may be executed in an order different from that depicted in the flow diagrams or sequence diagrams, or may be executed in parallel. Some of the steps in the operations may be deleted, or additional steps may be added to the process. Furthermore, the above-described operational flows are not limited to being executed independently, but may be executed by combining two or more operational flows. For example, some steps of one operational flow may be added to another operational flow, or some steps of one operational flow may be replaced with some steps of another operational flow.

[0145] A program may be provided that causes a computer to execute each process performed by the UE 100 or the base station 200. The program may be recorded on a computer-readable medium. Using the computer-readable medium, the program can be installed on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM. Furthermore, circuits that execute each process performed by the UE 100 or the base station 200 may be integrated, and at least a part of the UE 100 or the base station 200 may be configured as a semiconductor integrated circuit (chip set, SoC).

[0146] In the above-described embodiments, "transmit" may mean performing processing at least one layer in a protocol stack used for transmission, or may mean physically transmitting a signal wirelessly or via a wire. Alternatively, "transmit" may mean a combination of performing processing at least one layer and physically transmitting a signal wirelessly or via a wire. Similarly, "receive" may mean performing processing at least one layer in a protocol stack used for reception, or may mean physically receiving a signal wirelessly or via a wire. Alternatively, "receive" may mean a combination of processing at least one layer and physically receiving a signal wirelessly or via a wire.

[0147] The above describes the embodiments in detail with reference to the drawings, but the specific configuration is not limited to that described above, and various design changes can be made within the scope that does not deviate from the gist of the invention.

[0148] (Supplementary Notes) The following additional notes relate to features of the above-described embodiments: (Supplementary Note 1) A communications device comprising: a receiver that receives, from a base station, a radio resource control (RRC) message including information for setting one or more SSB periodicities for synchronization signals / physical broadcast channel blocks (SSBs); and a controller that monitors a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periodicities is set, wherein the controller determines the number of bits of the field in which the value corresponding to the one or more SSB periodicities is set based on the number of SSB periodicities set by the information for setting the one or more SSB periodicities. (Supplementary Note 2) The communications device according to Supplementary Note 1, wherein, when one SSB period is set by the information for setting the one or more SSB periodicities, the number of bits in the field to which a value corresponding to the one or more SSB periodicities is set is 1 bit, and when two SSB periodicities are set by the information for setting the one or more SSB periodicities, the number of bits in the field to which a value corresponding to the one or more SSB periodicities is set is 2 bits. (Supplementary Note 3) The communications device according to Supplementary Note 1 or 2, wherein the receiver receives an RRC message from the base station, the RRC message including information for setting a Radio Network Temporary Identifier (RNTI), and the controller monitors the PDCCH for the DCI format with a CRC scrambled by the RNTI. (Supplementary Note 4) The communication device according to any one of Supplementary Notes 1 to 3, wherein the receiving unit receives from the base station an RRC message including information for setting a start position of a block including the field to which a value corresponding to the one or more SSB periods is set, and the control unit determines a position of the field to which the value corresponding to the one or more SSB periods is set in the DCI format based on the information for setting the start position of the block.(Supplementary Note 5) The communication device according to any one of Supplements 1 to 4, wherein the receiver receives from the base station an RRC message including information for setting the size of the DCI format, and the controller determines the size of the DCI format based on the information for setting the size of the DCI format. (Supplementary Note 6) The communication device according to any one of Supplements 1 to 5, wherein the receiver receives from the base station an RRC message including information indicating time domain positions at which the SSBs are transmitted for the one or more SSB periodicities, and the controller determines time domain positions at which the SSBs are transmitted in each of the one or more SSB periodicities based on the information indicating the time domain positions at which the SSBs are transmitted. (Supplementary Note 7) The communication device according to any one of Supplements 1 to 6, wherein the receiver receives the SSBs from the base station in a secondary cell using an SSB periodicity corresponding to the value set in the field, and the SSBs are non-cell-defining SSBs. (Supplementary Note 8) A base station comprising: a transmitter that transmits, to a communication device, a radio resource control (RRC) message including information for setting one or more SSB periodicities for a synchronization signal / physical broadcast channel block (SSB), wherein the transmitter transmits a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periodicities is set, and wherein the number of bits of the field in which the value corresponding to the one or more SSB periodicities is set is based on the number of SSB periodicities set by the information for setting the one or more SSB periodicities. (Supplementary Note 9) A base station according to Supplementary Note 8, wherein, when one SSB period is set by the information for setting the one or more SSB periodicities, the number of bits of the field in which the value corresponding to the one or more SSB periodicities is set is 1 bit, and when two SSB periodicities are set by the information for setting the one or more SSB periodicities, the number of bits of the field in which the value corresponding to the one or more SSB periodicities is set is 2 bits.(Supplementary Note 10) The base station according to Supplementary Note 8 or 9, wherein the transmitter transmits to the communication device an RRC message including information for setting a Radio Network Temporary Identifier (RNTI), and the transmitter transmits the PDCCH for the DCI format accompanied by a CRC scrambled by the RNTI. (Supplementary Note 11) The base station according to any one of Supplements 8 to 10, wherein the transmitter transmits to the communication device an RRC message including information for setting a start position of a block including the field to which a value corresponding to the one or more SSB periodicities is set, and the position of the field in the DCI format to which the value corresponding to the one or more SSB periodicities is set is a position based on the information for setting the start position of the block. (Supplementary Note 12) The base station according to any one of Supplementary Notes 8 to 11, wherein the transmitter transmits to the communication device an RRC message including information for setting a size of the DCI format, and the size of the DCI format is a size based on the information for setting the size of the DCI format. (Supplementary Note 13) The base station according to any one of Supplementary Notes 8 to 12, wherein the transmitter transmits to the communication device an RRC message including information indicating time domain positions at which the SSBs are transmitted for the one or more SSB periodicities, and the time domain positions at which the SSBs are transmitted in each of the one or more SSB periodicities are positions based on the information indicating the time domain positions at which the SSBs are transmitted. (Supplementary Note 14) The base station according to any one of Supplementary Notes 8 to 13, wherein the transmitter transmits the SSBs to the communication device in a secondary cell using an SSB periodicity corresponding to the value set in the field, and the SSBs are non-cell-defining SSBs.(Supplementary Note 15) A communication method executed by a communication device, comprising: receiving from a base station a radio resource control (RRC) message including information for setting one or more SSB periodicities for synchronization signals / physical broadcast channel blocks (SSBs); monitoring a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periodicities is set; and determining the number of bits of the field in which a value corresponding to the one or more SSB periodicities is set based on the number of SSB periodicities set by the information for setting the one or more SSB periodicities.

[0149] (Supplementary Note 16) A communication device comprising: a receiving unit that receives predetermined information for identifying a reception timing of a synchronization signal block (SSB) from a cell that supports SSB adaptation in which the SSB is adaptively transmitted in the time domain; and a control unit that identifies a period in which the SSB is not transmitted based on the predetermined information.

[0150] (Supplementary Note 17) The communication device according to Supplementary Note 16, wherein the control unit controls not to perform the uplink transmission when a timing of uplink transmission to the cell overlaps with a timing of receiving the SSB, except for a period in which the SSB is not transmitted.

[0151] (Supplementary Note 18) The communication device according to Supplementary Note 16 or 17, wherein the predetermined information includes at least one of period information for setting a plurality of periods as the period of the SSB, and time position information for setting a plurality of time positions as positions in a time domain of the SSB.

[0152] (Supplementary Note 19) The communication device according to Supplementary Note 18, wherein the receiving unit receives downlink control information from the cell, the downlink control information including at least one of information indicating one of the plurality of periods and information indicating one of the plurality of time positions, and the control unit identifies at least one of the period of the SSB and a position of the SSB in the time domain using the downlink control information.

[0153] (Supplementary Note 20) The communication device according to Supplementary Note 19, wherein the downlink control information includes a field with a number of bits corresponding to the number of the plurality of periods when the predetermined information includes information indicating the period, and the downlink control information includes a field with a number of bits corresponding to the number of the plurality of time positions when the predetermined information includes information indicating the time positions.

[0154] (Supplementary Note 21) The communication device according to any one of Supplementary Notes 16 to 20, wherein the predetermined information includes information for setting an SSB adaptation period defined by at least one of an active period during which the SSB is transmitted and an inactive period during which the SSB is not transmitted, and the control unit specifies a period during which the SSB is not transmitted in the SSB adaptation period.

[0155] (Supplementary Note 22) The communication device according to Supplementary Note 21, wherein the control unit specifies the active period as a period during which the SSB is transmitted, and specifies the inactive period as a period during which the SSB is not transmitted.

[0156] (Supplementary Note 23) The communication device according to Supplementary Note 21 or 22, wherein the receiving unit receives, from the cell, downlink control information (DCI) including information indicating whether the SSB adaptation period is valid.

[0157] (Supplementary Note 24) The communication device according to any one of Supplementary Notes 16 to 23, wherein the receiving unit receives downlink control information including the predetermined information from the cell.

[0158] (Supplementary Note 25) The communication device according to Supplementary Note 24, wherein the receiving unit receives, from the cell, information for setting a search space for monitoring the downlink control information including the predetermined information with respect to a downlink bandwidth portion of the cell.

[0159] (Supplementary Note 26) A base station comprising: a transmitter that transmits, from a cell that supports SSB adaptation in which SSBs are adaptively transmitted in the time domain, to a communication device, predetermined information for identifying a reception timing of the SSB, wherein the predetermined information is used by the communication device to identify a period during which the SSB is not transmitted.

[0160] (Supplementary Note 27) A communication method executed by a communication device, comprising: a step of receiving predetermined information for identifying a reception timing of a synchronization signal block (SSB) from a cell supporting SSB adaptation in which the SSB is adaptively transmitted in the time domain; and a step of identifying a period in which the SSB is not transmitted based on the predetermined information.

Claims

1. A communications device comprising: a receiver that receives from a base station a radio resource control (RRC) message including information for setting one or more SSB periods for a synchronization signal / physical broadcast channel block (SSB); and a controller that monitors a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periods is set, wherein the controller determines the number of bits of the field in which the value corresponding to the one or more SSB periods is set based on the number of SSB periods set by the information for setting the one or more SSB periods.

2. A communication device according to claim 1, wherein when one SSB period is set by the information for setting one or more SSB periods, the number of bits in the field in which a value corresponding to the one or more SSB periods is set is 1 bit, and when two SSB periods are set by the information for setting one or more SSB periods, the number of bits in the field in which a value corresponding to the one or more SSB periods is set is 2 bits.

3. The communication device according to claim 1 or 2, wherein the receiver receives an RRC message from the base station, the RRC message including information for setting a radio network temporary identifier (RNTI), and the controller monitors the PDCCH for the DCI format with a CRC scrambled by the RNTI.

4. A communication device as described in claim 1 or 2, wherein the receiving unit receives from the base station an RRC message including information for setting the start position of a block including the field in which a value corresponding to the one or more SSB periods is set, and the control unit determines the position of the field in the DCI format in which the value corresponding to the one or more SSB periods is set based on the information for setting the start position of the block.

5. A communication device as described in claim 1 or 2, wherein the receiving unit receives an RRC message from the base station including information for setting the size of the DCI format, and the control unit determines the size of the DCI format based on the information for setting the size of the DCI format.

6. A communication device as described in claim 1 or 2, wherein the receiving unit receives an RRC message from the base station including information indicating the time domain position at which the SSB is transmitted for the one or more SSB periods, and the control unit determines the time domain position at which the SSB is transmitted for each of the one or more SSB periods based on the information indicating the time domain position at which the SSB is transmitted.

7. A communication device according to claim 1 or 2, wherein the receiving unit receives the SSB from the base station in a secondary cell using an SSB period corresponding to the value set in the field, and the SSB is a non-cell-defining SSB.

8. A base station comprising: a transmitter that transmits a radio resource control (RRC) message including information for setting one or more SSB periods for a synchronization signal / physical broadcast channel block (SSB) to a communication device; wherein the transmitter transmits a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periods is set; and the number of bits of the field in which the value corresponding to the one or more SSB periods is set is a number of bits based on the number of SSB periods set by the information for setting the one or more SSB periods.

9. The base station according to claim 8, wherein, when one SSB period is set by the information for setting one or more SSB periods, the number of bits in the field in which a value corresponding to the one or more SSB periods is set is 1 bit, and when two SSB periods are set by the information for setting one or more SSB periods, the number of bits in the field in which a value corresponding to the one or more SSB periods is set is 2 bits.

10. The base station according to claim 8 or 9, wherein the transmitter transmits an RRC message to the communication device, the RRC message including information for setting a radio network temporary identifier (RNTI), and the transmitter transmits the PDCCH for the DCI format with a CRC scrambled by the RNTI.

11. The base station according to claim 8 or 9, wherein the transmitting unit transmits to the communication device an RRC message including information for setting the start position of a block including the field in which a value corresponding to the one or more SSB periods is set, and the position of the field in the DCI format in which a value corresponding to the one or more SSB periods is set is a position based on the information for setting the start position of the block.

12. The base station according to claim 8 or 9, wherein the transmitting unit transmits to the communication device an RRC message including information for setting the size of the DCI format, and the size of the DCI format is a size based on the information for setting the size of the DCI format.

13. A base station as described in claim 8 or 9, wherein the transmitting unit transmits to the communication device an RRC message including information indicating the time domain position at which the SSB is transmitted for the one or more SSB periods, and the time domain position at which the SSB is transmitted in each of the one or more SSB periods is a position based on the information indicating the time domain position at which the SSB is transmitted.

14. The base station according to claim 8 or 9, wherein the transmitter transmits the SSB to the communication device in a secondary cell using an SSB period corresponding to the value set in the field, and the SSB is a non-cell-defining SSB.

15. A communication method executed by a communication device, comprising: receiving a radio resource control (RRC) message from a base station, the radio resource control (RRC) message including information for setting one or more SSB periods for a synchronization signal / physical broadcast channel block (SSB); monitoring a physical downlink control channel (PDCCH) for a downlink control information (DCI) format including a field in which a value corresponding to the one or more SSB periods is set; and determining the number of bits of the field in which a value corresponding to the one or more SSB periods is set based on the number of SSB periods set by the information for setting the one or more SSB periods.

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