User equipments, base stations and methods

Abstract

A user equipment (UE) is described. The UE may comprise processing circuitry configured to perform initial cell selection to find a first cell to camp on, and transmission circuitry configured to transmit a request of system information transmission prior to camp on the first cell.

Description

[DESCRIPTION][Title of Invention]USER EQUIPMENTS, BASE STATIONS AND METHODS[Technical Field]

[0001] The present invention relates to a user equipment, a base station and a method. [Background Art]

[0002] In the 3rd Generation Partnership Project (3GPP), a radio access method and a radio network for cellular mobile communications (hereinafter, referred to as Long Term Evolution, or Evolved Universal Terrestrial Radio Access) have been studied. In LTE (Long Term Evolution), a base station device is also referred to as an evolved NodeB (eNodeB), and a terminal device is also referred to as a User Equipment (UE). LTE is a cellular communication system in which multiple areas are deployed in a cellular structure, with each of the multiple areas being covered by a base station device. A single base station device may manage multiple cells. Evolved Universal Terrestrial Radio Access is also referred as E-UTRA.

[0003] In the 3 GPP, the next generation standard (New Radio: NR) has been studied in order to make a proposal to the Intemational-Mobile-Telecommunication-2020 (IMT- 2020) which is a standard for the next generation mobile communication system defined by the International Telecommunications Union (ITU). NR has been expected to satisfy a requirement considering three scenarios of enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC), in a single technology framework.

[0004] With the increase of traffic for 5G with its pervasive, network energy saving is getting one of the important techniques for environmental sustainability, to reduceenvironmental impact (greenhouse gas emissions), and for operational cost savings.Novel solutions to improve network energy savings need to be developed.[Brief Description of the Drawings]

[0005] Figure 1 is a conceptual diagram of a wireless communication system;

[0006] Figure 2 is an example showing the relationship between subcarrier-spacing configuration u, the number of OFDM symbols per slot Nslotsymb, and the CP configuration;

[0007] Figure 3 is a diagram showing an example of a method of configuring a resource grid;

[0008] Figure 4 is a diagram showing a configuration example of a resource grid 3001;

[0009] Figure 5 is a schematic block diagram showing a configuration example of the base station device;

[0010] Figure 6 is a schematic block diagram showing a configuration example of the terminal device;

[0011] Figure 7 is an example showing the higher layer parameters included in MIB,'

[0012] Figure 8 is a diagram showing a configuration example of an SS / PBCH block;

[0013] Figure 9 is a diagram showing an example of the monitoring occasion of the search-space-set;

[0014] Figure 10 is a diagram showing a diagram illustrating an example of a SIB1 request procedure between the terminal device 1 and the base station 3;

[0015] Figure 11 is an example of cell selection procedure; and

[0016] Figure 12 shows the states and state transitions and procedures in RRC_IDLE and RRC INACTIVE.[Description of Embodiments]

[0017] A user equipment (UE) is described. The UE may comprise processing circuitry configured to perform initial cell selection to find a first cell to camp on, and transmission circuitry configured to transmit a request of system information transmission prior to camp on the first cell.

[0018] The UE may also comprise the transmission circuitry configured to transmit the request for a second cell if the second cell is available for the request.

[0019] The UE may also comprise the transmission circuitry configured to transmit the request for a second cell if the second cell is available for the request and if reception power of the second cell is larger than a threshold.

[0020] A base station is described. The base station may comprise processing circuitry configured to make terminal device to perform initial cell selection to find a first cell to camp on, and reception circuitry configured to receive a request of system information transmission prior to camp on the first cell.

[0021] The base station may also comprise the reception circuitry configured to receive the request for a second cell if the second cell is available for the request.

[0022] A method performed by a user equipment is described. The method may comprise performing initial cell selection to find a first cell to camp on, and transmitting a request of system information transmission prior to camp on the first cell.

[0023] floor (CA) may be a floor function for real number CX. For example, floor (CX) may be a function that provides the largest integer within a range that does not exceed the real number CX. ceil (DX) may be a ceiling function to a real number DX. For example, ceil (DX) may be a function that provides the smallest integer within the range not less than the real number DX. mod (EX, FX) may be a function that provides theremainder obtained by dividing EXby FX. mod (EX, FX) may be a function that provides a value which corresponds to the remainder of dividing EX by FX. It is exp (GX) = eAGX. Here, e is Napier number. (HX)A(IX) indicates IX to the power of HX.

[0024] In a wireless communication system according to one aspect of the present embodiment, at least OFDM (Orthogonal Frequency Division Multiplex) is used. An OFDM symbol is a unit of time domain of the OFDM. The OFDM symbol includes at least one or more subcarriers. An OFDM symbol is converted to a time-continuous signal in baseband signal generation. In downlink, at least CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplex) is used. In uplink, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplex) is used. DFT-s-OFDM may be given by applying transform precoding to CP-OFDM. CP-OFDM is OFDM using CP (Cyclic Prefix).

[0025] The OFDM symbol may be a designation including a CP added to the OFDM symbol. That is, an OFDM symbol may be configured to include the OFDM symbol and a CP added to the OFDM symbol.

[0026] Figure 1 is a conceptual diagram of a wireless communication system. In Figure 1, the wireless communication system includes at least terminal device lA to 1C and a base station device 3 (BS 3: Base station 3). Hereinafter, the terminal devices lAto 1C are also referred to as a terminal device 1 (UE 1 : User Equipment 1).

[0027] A terminal device 1 is either in RRC_CONNECTED state or in RRC_INACTIVE state when an RRC (Radio Resource Control) connection has been established. If this is not the case, i.e. no RRC connection is established, the terminal device 1 is in RRC_IDLE state. When the terminal device 1 suspends the RRC connection, the terminal device 1 may be in RRC INACTI VE state.

[0028] A terminal device 1 in RRC IDLE state or a terminal device 1 in RRC__INACTIVE state may perform acquisition of system information (SI) and sending of SI request (if configured).

[0029] The BS 3 may be configured to include one or more transmission devices (or transmission points, transmission devices, reception devices, transmission points, reception points). When the BS 3 is configured by a plurality of transmission devices, each of the plurality of transmission devices may be arranged at a different position.

[0030] The BS 3 may provide one or more serving cells. A serving cell may be defined as a set of resources used for wireless communication. A serving cell is also referred to as a cell.

[0031] A serving cell may be configured to include at least one downlink component carrier (downlink carrier) and / or one uplink component carrier (uplink carrier). A serving cell may be configured to include at least two or more downlink component carriers and / or two or more uplink component carriers. A downlink component carrier and an uplink component carrier are also referred to as component carriers (carriers). The uplink component carrier can be used for sidelink communication.

[0032] For example, one resource grid may be provided for one component carrier. For example, one resource grid may be provided for one component carrier and a subcarrier-spacing configuration u. A subcarrier-spacing configuration u is also referred to as numerology. A resource grid includescsubcarriers. The resource gridstarts from a common resource block with index d- The common resource blockwith the index d is also referred to as a reference point of the resource grid. Theresource grid includes b OFDM symbols. The subscript x indicates thetransmission direction and indicates either downlink or uplink. One resource grid isprovided for an antenna port p, a subcarrier-spacing configuration u, and a transmission direction x. The resource grid may be applied to downlink, uplink and / or sidelink.

[0033] Resource grid is also referred to as carrier.

[0034] and N are given based at least on an RRC parameter (e.g.referred to as RRC parameter CarrierBandwidth). The RRC parameter is used to define one or more SCS (SubCarrier-Spacing) specific carriers. One resource grid corresponds to one SCS specific carrier. One component carrier may comprise one or more SCS specific carriers. The SCS specific carrier may be included in a system information block (SIB). For each SCS specific carrier, a subcarrier-spacing configuration u may be provided.

[0035] Figure 2 is an example showing the relationship between subcarrier-spacing configuration u, the number of OFDM symbols per slot Nslotsymb, and the CP configuration. In Figure 2A, for example, when the subcarrier-spacing configuration u is set to 2 and the CP configuration is set to normal CP (normal cyclic prefix),. Further, in Figure 2B, for example, when the subcarrier-spacing configuration u is set to 2 and the CP configuration is set to an extended CP (extended cyclic prefix), . The subcarrier-spacingconfiguration u may be applied to downlink, uplink and / or sidelink.

[0036] In the wireless communication system, a time unit Tcmay be used to represent the length of the time domain. The time unit. The constant k i

[0037] Transmission of signals in the downlink and / or transmission of signals in the uplink and / or transmission of signals in the sidelink may be organized into radio frames(system frames, frames) of length Tf. It is One radioframe is configured to include ten subframes. The subframe length is TThe number of OFDM symbols per subframe is N

[0038] For a subcarrier-spacing configuration u, the number of slots included in asubframe and indexes may be given. For example, slot index may be given inascending order with an integer value ranging from 0 to N in a subframe. Forsubcarrier-spacing configuration u, the number of slots included in a radio frame and indexes of slots included in the radio frame may be given. Also, the slot index f maybe given in ascending order with an integer value ranging from 0 to in theradio frame. Consecutive OFDM symbols may be included in one slot. It is.

[0039] Figure 3 is a diagram showing an example of a method of configuring a resource grid. The horizontal axis in Figure 3 indicates frequency domain. Figure 3 shows a configuration example of a resource grid of subcarrier-spacing configuration inthe component carrier 300 and a configuration example of a resource grid of subcarrierspacing configuration in a component carrier. One or more subcarrier-spacingconfiguration may be set for a component carrier. Although it is assumed in Figure 3 that1, various aspects of this embodiment are not limited to the condition of1.

[0040] The component carrier 300 is a band having a predetermined width in the frequency domain.

[0041] Point 3000 is an identifier for identifying a subcarrier. Point 3000 is also referred to as point A. The common resource block (CRB) set 3100 is a set of common resource blocks for the subcarrier-spacing configuration u\.

[0042] Among the common resource block-set 3100, the common resource block including the point 3000 (the block indicated by the upper right diagonal line in Figure 3) is also referred to as a reference point of the common resource block-set 3100. The reference point of the common resource block-set 3100 may be a common resource block with index 0 in the common resource block-set 3100.

[0043] The offset 3011 is an offset from the reference point of the common resource block-set 3100 to the reference point of the resource grid 3001. The offset 3011 is indicated by the number of common resource blocks which is relative to the subcarrierspacing configuration . The resource grid 3001 includes Ncommon resourceblocks starting from the reference point of the resource grid 3001.

[0044] The offset 3013 is an offset from the reference point of the resource grid 3001 to the reference pointof the BWP (Bandwidth Part) 3003 of the index z'l .

[0045] Common resource block-set 3200 is a set of common resource blocks with respect to subcarrier-spacing configuration U2.

[0046] A common resource block including the point 3000 (a block indicated by an upper left diagonal line in Figure 3) in the common resource block-set 3200 is also referred to as a reference point of the common resource block-set 3200. The reference point of the common resource block-set 3200 may be a common resource block with index 0 in the common resource block-set 3200.

[0047] The offset 3012 is an offset from the reference point of the common resource block-set 3200 to the reference point of the resource grid 3002. The offset 3012 isindicated by the number of common resource blocks for subcarrier-spacing configuration u = M2. The resource grid 3002 includes common resource blocks starting fromthe reference point of the resource grid 3002.

[0048] The offset 3014 is an offset from the reference point of the resource grid 3002 to the reference pointof the BWP 3004 with index z .

[0049] Figure 4 is a diagram showing a configuration example of a resource grid 3001. In the resource grid of Figure 4, the horizontal axis indicates OFDM symbol indexand the vertical axis indicates the subcarrier index ksc. The resource grid 3001 includes subcarriers, and includes OFDM symbols. A resourcespecified by the subcarrier index kscand the OFDM symbol index lsymin a resource grid is also referred to as a resource element (RE).

[0050] A resource block (RB) includes NRBSCconsecutive subcarriers. A resource block is a generic name of a common resource block, a physical resource block (PRB), and a virtual resource block (VRB). It is .

[0051] A resource block unit is a set of resources that corresponds to one OFDM symbol in one resource block. That is, one resource block unit includes 12 resource elements which corresponds to one OFDM symbol in one resource block.

[0052] Common resource blocks for a subcarrier-spacing configuration u are indexed in ascending order from 0 in the frequency domain in a common resource block-set. The common resource block with index 0 for the subcarrier-spacing configuration u includes (or collides with, matches) the point 3000. The index WHCRB of the common resource block with respect to the subcarrier-spacing configuration u satisfies the relationship ofceilThe subcarrier with fee = 0 is a subcarrier with the same center frequency as the center frequency of the subcarrier which corresponds to the point 3000.

[0053] Physical resource blocks for a subcarrier-spacing configuration u are indexed in ascending order from 0 in the frequency domain in a BWP. The index of thephysical resource block with respect to the subcarrier-spacing configuration u satisfies the relationship of «indicates the reference point of BWP with index i.

[0054] A BWP is defined as a subset of common resource blocks included in the resource grid. The BWP includes N common resource blocks starting from thereference points N, A BWP for the downlink component carrier is also referred to as a downlink BWP. A BWP for the uplink component carrier is also referred to as an uplink BWP. A BWP for the sidelink is also referred to as a sidelink BWP.

[0055] An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. For example, the channel may correspond to a physical channel. For example, the symbols may correspond to OFDM symbols. For example, the symbols may correspond to resource block units. For example, the symbols may correspond to resource elements.

[0056] Two antenna ports are said to be QCL (Quasi Co-Located) if the large-scale properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed. The large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters.

[0057] Carrier aggregation may be communication using a plurality of aggregated serving cells. Carrier aggregation may be communication using a plurality of aggregated component carriers. Carrier aggregation may be communication using a plurality ofaggregated downlink component carriers. Carrier aggregation may be communication using a plurality of aggregated uplink component carriers.

[0058] Figure 5 is a schematic block diagram showing a configuration example of the BS 3. As shown in Figure 5, the BS 3 includes at least a part or all of the wireless transmission / reception unit (physical layer processing unit) 30 and the higher-layer processing unit 34. The wireless transmission / reception unit 30 includes at least a part or all of the antenna unit 31, the RF unit 32 (Radio Frequency unit 32), and the baseband unit 33. The higher-layer processing unit 34 includes at least a part or all of the medium access control layer processing unit 35 and the radio resource control (RRC) layer processing unit 36.

[0059] The wireless transmission / reception unit 30 includes at least a part of or all of a wireless transmission unit 30a and a wireless reception unit 30b. The configuration of the baseband unit 33 included in the wireless transmission unit 30a and the configuration of the baseband unit 33 included in the wireless reception unit 30b may be the same or different. The configuration of the RF unit 32 included in the wireless transmission unit 30a and the configuration of the RF unit 32 included in the wireless reception unit 30b may be the same or different. The configuration of the antenna unit 31 included in the wireless transmission unit 30a and the configuration of the antenna unit 31 included in the wireless reception unit 30b may be the same or different.

[0060] The higher-layer processing unit 34 provides downlink data (a transport block) to the wireless transmission / reception unit 30 (or the wireless transmission unit 30a). The higher-layer processing unit 34 performs processing of a medium access control (MAC) layer, a packet data convergence protocol layer (PDCP layer), a radio link control layer (RLC layer) and / or an RRC layer.

[0061] The medium access control layer processing unit 35 included in the higher- layer processing unit 34 performs processing of the MAC layer.

[0062] The radio resource control layer processing unit 36 included in the higher- layer processing unit 34 performs the process of the RRC layer. The radio resource control layer processing unit 36 manages various configuration information / parameters (RRC parameters) of the terminal device 1. The radio resource control layer processing unit 36 configures an RRC parameter based on the RRC message received from the terminal device 1.

[0063] The wireless transmission / reception unit 30 (or the wireless transmission unit 30a) performs processing such as encoding and modulation. The wireless transmission / reception unit 30 (or the wireless transmission unit 30a) generates a physical signal by encoding and modulating the downlink data. The wireless transmission / reception unit 30 (or the wireless transmission unit 30a) converts OFDM symbols in the physical signal to a baseband signal by conversion to a time-continuous signal. The wireless transmission / reception unit 30 (or the wireless transmission unit 30a) transmits the baseband signal (or the physical signal) to the terminal device 1 via radio frequency. The wireless transmission / reception unit 30 (or the wireless transmission unit 30a) may arrange the baseband signal (or the physical signal) on a component carrier and transmit the baseband signal (or the physical signal) to the terminal device 1.

[0064] The wireless transmission / reception unit 30 (or the wireless reception unit 30b) performs processing such as demodulation and decoding. The wireless transmission / reception unit 30 (or the wireless reception unit 30b) separates, demodulates and decodes the received physical signal, and provides the decoded information to the higher-layer processing unit 34. The wireless transmission / reception unit 30 (or the wireless receptionunit 30b) may perform the channel access procedure prior to the transmission of the physical signal.

[0065] The wireless transmission / reception unit 30 may have a function to transmit one or more synchronization signal and physical broadcasting channel blocks (SSBs) to one or more terminal device 1. The wireless transmission / reception unit 30 may have a function to transmit a master information block (MIB) including a first parameter (e.g ssb-SubcarrierOffsef) and a second parameter (e.g. pdcch-ConflgSIBP) on physical broadcast channel (PBCH), where the first parameter indicates a terminal device 1 determines whether to transmit a preamble. The wireless transmission / reception unit 30 may have a function to monitor the preamble using configuration indicated by the second parameter in case that a variable (e.g.) determined based on the first parameter is a first value.

[0066] The RF unit 32 demodulates the physical signal received via the antenna unit 31 into a baseband signal (down convert), and / or removes extra frequency components. The RF unit 32 provides the processed analog signal to the baseband unit 33.

[0067] The baseband unit 33 converts an analog signal (signals on radio frequency) input from the RF unit 32 into a digital signal (a baseband signal). The baseband unit 33 separates a portion which corresponds to CP (Cyclic Prefix) from the digital signal. The baseband unit 33 performs Fast Fourier Transformation (FFT) on the digital signal from which the CP has been removed. The baseband unit 33 provides the physical signal in the frequency domain.

[0068] The baseband unit 33 performs Inverse Fast Fourier Transformation (IFFT) on downlink data to generate an OFDM symbol, adds a CP to the generated OFDMsymbol, generates a digital signal (baseband signal), and convert the digital signal into an analog signal. The baseband unit 33 provides the analog signal to the RF unit 32.

[0069] The RF unit 32 removes extra frequency components from the analog signal (signals on radio frequency) input from the baseband unit 33, up-converts the analog signal to a radio frequency, and transmits it via the antenna unit 31. The RF unit 32 may have a function of controlling transmission power. The RF unit 32 is also referred to as a transmission power control unit.

[0070] At least one or more serving cells (or one or more component carriers, one or more downlink component carriers, one or more uplink component carriers) may be configured for the terminal device 1.

[0071] Each of the serving cells set for the terminal device 1 may be any of PCell (Primary cell), PSCell (Primary SCG cell), and SCell (Secondary Cell).

[0072] A PCell is a serving cell included in an MCG (Master Cell Group). A PCell is a cell (implemented cell) which performs an initial connection establishment procedure or a connection re-establishment procedure by the terminal device 1.

[0073] A PSCell is a serving cell included in a SCG (Secondary Cell Group). A PSCell is a serving cell in which random-access is performed by the terminal device 1 in a reconfiguration procedure with synchronization (Reconfiguration with synchronization).

[0074] A SCell may be included in either an MCG or a SCG.

[0075] The serving cell group (cell group) is a designation including at least MCG and SCG. The serving cell group may include one or more serving cells (or one or more component carriers). One or more serving cells (or one or more component carriers) included in the serving cell group may be operated by carrier aggregation.

[0076] One or more downlink B WPs may be configured for each serving cell (or each downlink component carrier). One or more uplink BWPs may be configured for each serving cell (or each uplink component carrier).

[0077] Among the one or more downlink BWPs set for the serving cell (or the downlink component carrier), one downlink BWP may be set as an active downlink B WP (or one downlink BWP may be activated). Among the one or more uplink BWPs set for the serving cell (or the uplink component carrier), one uplink BWP may be set as an active uplink BWP (or one uplink BWP may be activated).

[0078] APDSCH, a PDCCH, a CSI-RS and other physical downlink channels / signals may be received in the active downlink BWP. The terminal device 1 may receive the PDSCH, the PDCCH, and the CSI-RS in the active downlink BWP. Additionally, in some case, the terminal device 1 may receive the CSI-RS or other physical downlink channels / signals (e.g., Positioning RS (PRS)) in the downlink BWP that is not active or in the cell that is not a serving cell. A PUCCH, a PUSCH, an SRS and other physical uplink channels / signals may be sent on the active uplink BWP. The terminal device 1 may transmit the PUCCH, the PUSCH, the SRS and other physical uplink channels / signals in the active uplink BWP. Additionally, in some case, the terminal device 1 may receive the SRS or other physical uplink channels / signals (e.g., SRS for Positioning) in the uplink BWP that is not active or in the cell that is not a serving cell. The active downlink BWP and the active uplink BWP are also referred to as active BWP.

[0079] Downlink BWP switching deactivates an active downlink BWP and activates one of inactive downlink BWPs which are other than the active downlink BWP. The downlink BWP switching may be controlled by a BWP field included in a downlinkcontrol information. The downlink BWP switching may be controlled based on higher- layer parameters.

[0080] Uplink BWP switching is used to deactivate an active uplink BWP and activate any inactive uplink BWP which is other than the active uplink BWP. Uplink BWP switching may be controlled by a BWP field included in a downlink control information. The uplink BWP switching may be controlled based on higher-layer parameters.

[0081] Among the one or more downlink BWPs set for the serving cell, two or more downlink BWPs may not be set as active downlink BWPs. For the serving cell, one downlink BWP may be active at a certain time.

[0082] Among the one or more uplink BWPs set for the serving cell, two or more uplink BWPs may not be set as active uplink BWPs. For the serving cell, one uplink BWP may be active at a certain time.

[0083] The aforementioned procedures for Uplink BWP may be applicable to Sidelink BWP.

[0084] Figure 6 is a schematic block diagram showing a configuration example of the terminal device 1. As shown in Figure 6, the terminal device 1 includes at least a part or all of the wireless transmission I reception unit (physical layer processing unit) 10 and the higher-layer processing unit 14. The wireless transmission I reception unit 10 includes at least a part or all of the antenna unit 11, the RF unit 12, and the baseband unit 13. The higher-layer processing unit 14 includes at least a part or all of the medium access control layer processing unit 15 and the radio resource control layer processing unit 16.

[0085] The wireless transmission / reception unit 10 includes at least a part of or all of a wireless transmission unit 10a and a wireless reception unit 10b. The configuration of the baseband unit 13 included in the wireless transmission unit 10a and theconfiguration of the baseband unit 13 included in the wireless reception unit 10b may be the same or different. The configuration of the RF unit 12 included in the wireless transmission unit 10a and the RF unit 12 included in the wireless reception unit 10b may be the same or different. The configuration of the antenna unit 11 included in the wireless transmission unit 10a and the configuration of the antenna unit 11 included in the wireless reception unit 10b may be the same or different.

[0086] The higher-layer processing unit 14 provides uplink or sidelink data (a transport block) to the wireless transmission / reception unit 10 (or the wireless transmission unit 10a). The higher-layer processing unit 14 performs processing of a MAC layer, a packet data integration protocol layer, a radio link control layer, and / or an RRC layer. The higher-layer processing unit 14 may also performs processing of a MAC layer, a packet data integration protocol layer, a radio link control layer, and / or an RRC layer for PC5.

[0087] The medium access control layer processing unit 15 included in the higher- layer processing unit 14 performs processing of the MAC layer.

[0088] The radio resource control layer processing unit 16 included in the higher- layer processing unit 14 performs the process of the RRC layer and / or the PC5 RRC (PC5-RRC) process. The radio resource control layer processing unit 16 manages various configuration information / parameters (RRC parameters and / or PC5 RRC (PC5-RRC) parameters) of the terminal device 1. The radio resource control layer processing unit 16 configures RRC parameters based on the RRC message received from the BS 3 and / or PC5 RRC parameters based on the PC5 RRC (PC5-RRC) message received from another terminal device 1.

[0089] The wireless transmission / reception unit 10 (or the wireless transmission unit 10a) performs processing such as encoding and modulation. The wireless transmission I reception unit 10 (or the wireless transmission unit 10a) generates a physical signal by encoding and modulating the uplink data and / or sidelink data. The wireless transmission / reception unit 10 (or the wireless transmission unit 10a) converts OFDM symbols in the physical signal to a baseband signal by conversion to a time-continuous signal. The wireless transmission / reception unit 10 (or the wireless transmission unit 10a) transmits the baseband signal (or the physical signal) to the BS 3 or to another terminal device 1 via radio frequency. The wireless transmission / reception unit 10 (or the wireless transmission unit 10a) may arrange the baseband signal (or the physical signal) on a BWP (active uplink BWP) and transmit the baseband signal (or the physical signal) to the BS 3.

[0090] The wireless transmission / reception unit 10 (or the wireless reception unit 10b) performs processing such as demodulation and decoding. The wireless transmission / reception unit 10 (or the wireless reception unit 10b) may receive a physical signal in a BWP (active downlink BWP) of a serving cell and / or in a Sidelink BWP. The wireless transmission / reception unit 10 (or the wireless reception unit 10b) separates, demodulates and decodes the received physical signal, and provides the decoded information to the higher-layer processing unit 14. The wireless transmission I reception unit 10 (or the wireless reception unit 10b) may perform the channel access procedure prior to the transmission of the physical signal.

[0091] The wireless transmission / reception unit 10 may have a function to receive, from a BS 3, one or more synchronization signal and physical broadcasting channel blocks (SSBs). The wireless transmission / reception unit 10 may have a function toreceive a first parameter (e.g ssb-SubcarrierOffset) and a second parameter (e.g. pdcch- ConfigSIBl'. controlResourceSetZero and / or searchSpaceZero) included in master information block (MIB). The wireless transmission / reception unit 10 may have a function to transmit the SIB 1 request signal using configuration of the SIB 1 request signal in case determining to send the SIB1 request signal. The wireless transmission / reception unit 10 may have a function to a preamble using configuration indicated by the second parameter in case determining to transmit the preamble.

[0092] The RF unit 12 demodulates the physical signal received via the antenna unit 11 into a baseband signal (down convert), and / or removes extra frequency components. The RF unit 12 provides the processed analog signal to the baseband unit 13.

[0093] The baseband unit 13 converts an analog signal (signals on radio frequency) input from the RF unit 12 into a digital signal (a baseband signal). The baseband unit 13 separates a portion which corresponds to CP from the digital signal, performs fast Fourier transformation on the digital signal from which the CP has been removed, and provides the physical signal in the frequency domain.

[0094] The baseband unit 13 performs inverse fast Fourier transformation on uplink data to generate an OFDM symbol, adds a CP to the generated OFDM symbol, generates a digital signal (baseband signal), and convert the digital signal into an analog signal. The baseband unit 13 provides the analog signal to the RF unit 12.

[0095] The RF unit 12 removes extra frequency components from the analog signal (signals on radio frequency) input from the baseband unit 13, up-converts the analog signal to a radio frequency, and transmits it via the antenna unit 11 The RF unit 12 may have a function of controlling transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0096] The higher-layer processing unit 14 may have a function to select an SSB from the one or more SSBs based on one or more reference signal received power (RSRP) thresholds. The higher-layer processing unit 14 may have a function to determine to transmit a preamble if a variable (e.g. fc_SSB) determined based on a first parameter (e.g ssb-SubcarrierOffsef) included in master information block (MIB). The higher-layer processing unit 14 may have a function to determine whether a control resource set (CORESET) for TypeO-PDCCH common search space (CSS) set is present or not based on the variable. The higher-layer processing unit 14 may have a function to determine a number of consecutive resource blocks for the CORESET based on the second parameter if the variable is a second value.

[0097] Hereinafter, physical signals (signals) will be described.

[0098] Physical signal is a generic term for downlink physical channels, downlink physical signals, uplink physical channels, uplink physical signals, sidelink physical channels, and sidelink physical signals. The physical channel is a generic term for downlink physical channels, uplink physical channels and sidelink physical channels.

[0099] An uplink physical channel may correspond to a set of resource elements that carry information originating from the higher-layer and / or uplink control information. The uplink physical channel may be a physical channel used in an uplink component carrier. The uplink physical channel may be transmitted by the terminal device 1. The uplink physical channel may be received by the BS 3. In the wireless communication system according to one aspect of the present embodiment, at least part or all of PUCCH (Physical Uplink Control CHannel), PUSCH (Physical Uplink Shared CHannel), and PRACH (Physical Random Access CHannel) may be used.

[0100] A PUCCH may be used to transmit uplink control information (UCI). The PUCCH may be sent to deliver (transmission, convey) uplink control information. The uplink control information may be mapped to (or arranged in) the PUCCH. The terminal device 1 may transmit PUCCH in which uplink control information is arranged. The BS 3 may receive the PUCCH in which the uplink control information is arranged.

[0101] Uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) includes at least part or all of channel state information (CSI), scheduling request (SR), and HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgem ent).

[0102] Channel state information is conveyed by using channel state information bits or a channel state information sequence. Scheduling request is also referred to as a scheduling request bit or a scheduling request sequence. HARQ-ACK information is also referred to as a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0103] HARQ-ACK information may include HARQ-ACK status which corresponds to a transport block (TB: Transport block, MAC PDU: Medium Access Control Protocol Data Unit, DL-SCH: Downlink-Shared Channel, UL-SCH: Uplink-Shared Channel, PDSCH: Physical Downlink Shared CHannel, PUSCH: Physical Uplink Shared CHannel). The HARQ-ACK status may indicate ACK (acknowledgement) or NACK (negative-acknowledgement) corresponding to the transport block. The ACK may indicate that the transport block has been successfully decoded. The NACK may indicate that the transport block has not been successfully decoded. The HARQ-ACK information may include a HARQ-ACK codebook that includes one or more HARQ-ACK status (or HARQ-ACK bits).

[0104] For example, the correspondence between the HARQ-ACK information and the transport block may mean that the HARQ-ACK information and the PDSCH used for transmission of the transport block correspond.

[0105] HARQ-ACK status may indicate ACK or NACK which correspond to one CBG (Code Block Group) included in the transport block.

[0106] The scheduling request may at least be used to request PUSCH (or UL-SCH) resources for new transmission. The scheduling request may be used to indicate either a positive SR or a negative SR. The fact that the scheduling request indicates a positive SR is also referred to as "a positive SR is sent". The positive SR may indicate that the PUSCH (or UL-SCH) resource for initial transmission is requested by the terminal device 1. A positive SR may indicate that a higher-layer is to trigger a scheduling request. The positive SR may be sent when the higher-layer instructs to send a scheduling request. The fact that the scheduling request bit indicates a negative SR is also referred to as "a negative SR is sent". A negative SR may indicate that the PUSCH (or UL-SCH) resource for initial transmission is not requested by the terminal device 1. A negative SR may indicate that the higher-layer does not trigger a scheduling request. A negative SR may be sent if the higher-layer is not instructed to send a scheduling request.

[0107] The channel state information may include at least part or all of a channel quality indicator (CQI), a precoder matrix indicator (PM1), and a rank indicator (RI). CQI is an indicator related to channel quality (e.g., propagation quality) or physical channel quality, and PMI is an indicator related to a precoder. RI is an indicator related to transmission rank (or the number of transmission layers).

[0108] Channel state information may be provided at least based on receiving one or more physical signals (e.g., one or more CSI-RSs) used at least for channel measurement.The channel state information may be selected by the terminal device 1 at least based on receiving one or more physical signals used for channel measurement. Channel measurements may include interference measurements.

[0109] A PUCCH may correspond to a PUCCH format. A PUCCH may be a set of resource elements used to convey a PUCCH format. A PUCCH may include a PUCCH format. A PUCCH format may include UCI.

[0110] A PUSCH may be used to transmit uplink data (a transport block) and / or uplink control information. A PUSCH may be used to transmit uplink data (a transport block) corresponding to a UL-SCH and / or uplink control information. A PUSCH may be used to convey uplink data (a transport block) and / or uplink control information. A PUSCH may be used to convey uplink data (a transport block) corresponding to a UL- SCH and / or uplink control information. Uplink data (a transport block) may be arranged in a PUSCH. Uplink data (a transport block) corresponding to UL-SCH may be arranged in a PUSCH. Uplink control information may be arranged to a PUSCH. The terminal device 1 may transmit a PUSCH in which uplink data (a transport block) and / or uplink control information is arranged. The BS 3 may receive a PUSCH in which uplink data (a transport block) and / or uplink control information is arranged.

[0111] A PRACH may be used to transmit a random-access preamble. The PRACH may be used to convey a random-access preamble. The sequenceof the PRACH is defined by ). The xumay be a ZC sequence (Zadoff-Chu sequence). The xumay be defined by ). The j is animaginary unit. The p is the circle ratio. The Cvcorresponds to cyclic shift of the PRACH. LRA corresponds to the length of the PRACH. The LRA may be 839 or 139 or another value. The i is an integer in the range of 0 to LRA-1. The u is a sequence index for thePRACH. A transmission of PRACH means a transmission of random-access preamble on PRACH. The terminal device 1 may transmit the PRACH. The BS 3 may receive the PRACH. Single PRACH transmission is a transmission of a random access preamble on a PRACH occasion. Multiple PRACH transmissions (can be called as PRACH repetition, preamble repetitions and / or Msgl repetition) is multiple transmissions of a random access preamble on multiple PRACH occasions within a PRACH attempt.

[0112] For a given PRACH opportunity, 64 random-access preambles are defined. The random-access preamble is specified (determined, given) at least based on the cyclic shift Cvof the PRACH and the sequence index u for the PRACH.

[0113] An uplink physical signal may correspond to a set of resource elements. The uplink physical signal may not carry information generated in the higher-layer. The uplink physical signal may be a physical signal used in the uplink component carrier. The terminal device 1 may transmit an uplink physical signal. The BS 3 may receive the uplink physical signal. In the radio communication system according to one aspect of the present embodiment, at least a part or all of UL DMRS (UpLink Demodulation Reference Signal), SRS (Sounding Reference Signal), UL PTRS (UpLink Phase Tracking Reference Signal) may be used.

[0114] UL DMRS is a generic name of a DMRS for a PUSCH and a DMRS for a PUCCH.

[0115] A set of antenna ports of a DMRS for a PUSCH (a DMRS associated with a PUSCH, a DMRS included in a PUSCH, a DMRS which corresponds to a PUSCH) may be given based on a set of antenna ports for the PUSCH. That is, the set of DMRS antenna ports for the PUSCH may be the same as the set of antenna ports for the PUSCH.

[0116] Transmission of a PUSCH and transmission of a DMRS for the PUSCH may be indicated (or scheduled) by one DCI format. The PUSCH and the DMRS for the PUSCH may be collectively referred to as a PUSCH. Transmission of the PUSCH may be transmission of the PUSCH and the DMRS for the PUSCH.

[0117] A PUSCH may be estimated from a DMRS for the PUSCH. That is, propagation path of the PUSCH may be estimated from the DMRS for the PUSCH.

[0118] A set of antenna ports of a DMRS for a PUCCH (a DMRS associated with a PUCCH, a DMRS included in a PUCCH, a DMRS which corresponds to a PUCCH) may be identical to a set of antenna ports for the PUCCH.

[0119] Transmission of a PUCCH and transmission of a DMRS for the PUCCH may be indicated (or triggered) by one DCI format. The arrangement of the PUCCH in resource elements (resource element mapping) and / or the arrangement of the DMRS in resource elements for the PUCCH may be provided at least by one PUCCH format. The PUCCH and the DMRS for the PUCCH may be collectively referred to as PUCCH. Transmission of the PUCCH may be transmission of the PUCCH and the DMRS for the PUCCH.

[0120] A PUCCH may be estimated from a DMRS for the PUCCH. That is, propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0121] A downlink physical channel may correspond to a set of resource elements that carry information originating from the higher-layer and / or downlink control information. The downlink physical channel may be a physical channel used in the downlink component carrier. The BS 3 may transmit the downlink physical channel. The terminal device 1 may receive the downlink physical channel. In the wireless communication system according to one aspect of the present embodiment, at least a partor all of PBCH (Physical Broadcast Channel), PDCCH (Physical Downlink Control Channel), and PDSCH (Physical Downlink Shared Channel) may be used.

[0122] The downlink physical channels including PBCH and PDSCH may be used to provide system information (SI) to one or more terminal devices 1.

[0123] SI is divided into the MIB (Master Information Block) and a number of SIBs (System Information Block(s)).

[0124] The MIB may be always transmitted on the BCH with a periodicity of 80 ms and repetitions made within 80 ms and it includes parameters that are needed to acquire SIB 1 from the cell. The first transmission of the MIB may be scheduled in subframes and repetitions are scheduled according to the period of SSB.

[0125] The gNB may consume a lot of network energy because of SIB 1 broadcast. The SIB 1 may be transmitted on-demand in order to save power on the gNB (network). This procedure can be called as On-demand SIB1. For example, if the on-demand SIB1 is configured, the gNB may stop to broadcast the SIB1 to reduce energy consumption. Then, when UE requests the SIB1 to the network while the SIB1 is not broadcasted, the network may start to broadcast the SIB1. On-demand SIB1 is more effective for network energy saving when there are less communications within the cell (i.e. low load).

[0126] The SIB1 may be transmitted on the DL-SCH with a periodicity of 160 ms and variable transmission repetition periodicity within 160 ms. The default transmission repetition periodicity of SIB1 is 20 ms but the actual transmission repetition periodicity may be up to network implementation. SIB1 repetition transmission period maybe 20 ms. SIB1 transmission repetition period may be the same as the SSB period. SIB1 includes information regarding the availability and scheduling (e.g. mapping of SIBs to SI message, periodicity, Si-window size) of other SIBs with an indication whether one or more SIBsare only provided on-demand and, in that case, the configuration needed by the terminal device 1 to perform the SI request. SIB1 may be cell-specific SIB.

[0127] SIB1 may be provided on-demand. The terminal device 1 may perform SIB1 request procedure if the SIB1 request is triggered. A channel / signal used to perform SIB1 request may be called as uplink wake-up signal (UL-WUS), UE wake-up signal (UE- WUS) or SIB1 request signal. The SIB1 request procedure may comprise transmitting a random access preamble on PRACH using a certain configuration (e.g. use of the dedicated random access preamble for SIB1 request and / or a dedicated random access resource for SIB1 request). Alternatively, the SIB1 request procedure may comprise receiving a PDCCH scheduling a PDSCH containing a system information carrying configuration of the UL-WUS, UE-WUS or SIB1 request signal, and transmitting a random access preamble on PRACH using a certain configuration.

[0128] SSB which is transmitted while the SIB1 is dormant for on-demand SIB1 may be called as SSB which is associated with SIB1 dormancy. In contrast, SSB which is transmitted while the SIB1 is transmitted may be balled as SSB which is associated with SIB1 transmission. Time / frequency domain resource allocation of the SSB which is associated with SIB1 dormancy may be same as SSB mentioned above as shown in Figure 8. The UE interpretation of contents in the PBCH (MIB or PBCH payload) in the SSB which is associated with SIB1 dormancy may be different from that of SSB which is associated with SIB1 transmission.

[0129] SIBs other than SIB1 and posSIBs are carried in Systeminformation (SI) messages, which are transmitted on the DL-SCH. Only SIBs or posSIBs having the same periodicity can be mapped to the same SI message. SIBs and posSIBs are mapped to different SI messages, i.e. an SI message contains either only SIBs or only posSIBs. EachSI message is transmitted within periodically occurring time domain windows (referred to as Si-windows with same length for all SI messages). Each SI message is associated with an Sl-window and the Sl-windows of different SI messages do not overlap. That is, within one Sl-window only the corresponding SI message is transmitted. An SI message may be repeated with the same content a number of times within the Sl-window. Any SIB or posSIB except SIB1 can be configured to be cell specific or area specific, using an indication in SIB1. The cell specific SIB is applicable only within a cell that provides the SIB while the area specific SIB is applicable within an area referred to as SI area, which consists of one or several cells and is identified by systemlnformationArealD.

[0130] The mapping of SIBs to SI messages is configured in higher layer parameter schedulinglnfoList and higher layer parameter scheduling!nfoList2, while the mapping of posSIBs to SI messages is configured in higher layer parameter posSchedulinglnfoList and higher layer parameter scheduling!nfoList2. Each SIB and each posSIB is mapped to a single SI message.

[0131] For a terminal device 1 in RRC_CONNECTED state, the network can provide system information through dedicated signalling for the terminal device 1 using the RRCReconfiguration message.

[0132] For PSCell and SCells, the network provides the required SI by dedicated signalling, i.e. within an RRCReconfiguration message. Nevertheless, the terminal device 1 shall acquire MIB of the PSCell to get SFN timing of the SCG (which may be different from MCG). Upon change of relevant SI for SCell, the network releases and adds the concerned SCell. For PSCell, the required SI can only be changed with Reconfiguration with Sync.

[0133] The PBCH may be used to transmit a MIB and / or physical layer control information. The physical layer control information is a kind of downlink control information. The PBCH may be sent to deliver the MIB and / or the physical layer control information. A BCH may be mapped (or corresponding) to the PBCH. The terminal device 1 may receive the PBCH. The BS 3 may transmit the PBCH. The physical layer control information is also referred to as a PBCH payload and a PBCH payload related to timing. The MIB may include one or more higher-layer parameters.

[0134] Figure 7 is an example showing the higher layer parameters included in MIB which is a higher layer parameter for MIB and the higher layer parameters included in PDCCH-ConflgSIBl which is an IE for pdcch-ConfigSIBl included in MIB.

[0135] The higher layer parameter MIB may include parameter systemFrameNumber, parameter subCarrier SpacingCommon, parameter ssb-SubcarrierOffset, parameter dmrs- TypeA-Position, parameter pdcch-ConflgSIBl , parameter cellBarred, intraFreqReselection and spare bit.

[0136] systemFrameNumber indicates the 6 most significant bits (MSB) of the 10-bit System Frame Number (SFN). The 4 LSB of the SFN are conveyed in the PBCH transport block as part of channel coding (i.e. outside the MIB encoding).

[0137] subCarrier SpacingCommon indicates subcarrier spacing for SIB1, Msg.2 / 4 and MsgB for initial access, paging and broadcast Si-messages. If the terminal device 1 acquires this MIB on an FR1 carrier frequency, the value scs!5or60 corresponds to 15 kHz and the value scs30orl20 corresponds to 30 kHz. If the terminal device 1 acquires this MIB on an FR2 carrier frequency, the value scs!5or60 corresponds to 60 kHz and the value scs30or!20 corresponds to 120 kHz. For operation with shared spectrum channel access in FR1 and for operation in FR2-2, the subcarrier spacing for SIB1, Msg.2 / 4 andMsgB for initial access, paging and broadcast Si-messages is same as that for the corresponding S SB. For operation with shared spectrum channel access, this field instead is used for deriving the QCL relation between SS / PBCH blocks.

[0138] ssb-SubcarrierOffset corresponds to A , which is the frequency domainoffset between SSB and the overall resource block grid in number of subcarriers. The_ may be determined based on the ssb-SubcarrierOffset in the acquired MIB. For operation with shared spectrum channel access in FR1 , this field may correspond to / cSSB, and & may be obtained fromThe 4 least significant bits of may be givenby the ssb-SubcarrierOffset and the most significant bit of kSSBmay be given by the one specific bit of PBCH payload. If ; otherwise,. The LSB of this field may be used also for deriving the QCL relation between SS / PBCH blocks. This field may indicate that this cell does not provide SIB1 and that there is hence no CORESET#0 configured in MIB. In this case, the field pdcch- ConfigSIBl may indicate the frequency positions where the UE may (not) find a SS / PBCH with a control resource set and search space for SIB 1 or configuration of uplink wakeup signal to request the base station 3 to transmit SS / PBCH block with a control resource set and search space for SIB1 (or SS / PBCH block which is associated with SIB1 broadcasting) and SIB1.

[0139] dmrs-TypeA-Position indicates position of (first) DM-RS for downlink and uplink.

[0140] pdcch-ConfigSIBl determines a common ControlResourceSet (CORESET), a common search space and necessary PDCCH parameters. If the field ssb- SubcarrierOffset indicates that SIB1 is absent, the field pdcch-ConfigSIBl indicates the frequency positions where the UE may find SS / PBCH block with SIB1, the frequencyrange where the network does not provide SS / PBCH block with SIB1 or the configuration of SIB1 request signal (can be referred as uplink wakeup signal:UL-WUS).

[0141] cellBarred indicates whether the cell is barred. Value barred means that the cell is barred.

[0142] The value barred may mean that the cell is barred or SIB1 is not transmitted in the cell. If the SIB1 is not transmitted in the cell, terminal device 1 capable to request SIB 1 may interpret this value as the SIB 1 is not being transmitted and may trigger request of the SIB1. The terminal device 1 which is not capable to request SIB1 may interpret that the cell is barred.

[0143] The value that does not indicate barred or indicates notBarred may basically mean that the cell is not barred. If cellBarred does not indicate barred or indicates notBarred and a parameter of MIB (e.g. at least k_SSB derived by ssb-SubcarrierOffsef) indicates that request of the SIB1 is available (or SIB1 is not transmitted), the terminal device 1 that is capable of NES SIB1 request may interpret that SIB1 is able to be requested to the cell, and the terminal device 1 that is not capable of NES SIB1 request may consider the cell as barred.

[0144] intraFreqReselection controls cell selection / reselection to intra-frequency cells when the highest ranked cell is barred, or treated as barred by the UE.

[0145] The IE PDCCH-ConfigSIBl is used to configure CORESET#0 and search space#0. The PDCCH-ConfigSIBl includes parameter controlResourceSetZero and parameter searchSpaceZero .

[0146] controlResourceSetZero may be used to determine a common ControlResourceSet (CORESET) with ID #0 (can be referred as CORESET#0). The CORESET#0 is a control resource set for at least SIB1 scheduling, can be configuredeither via MIB or via dedicated RRC signalling. The CORESET 0 is a special type of CORESET which carries PDCCH / DCI for SIB1.

[0147] searchSpaceZero may be used to determines a common search space with ID #0.

[0148] Physical layer control information includes 8 bits. The physical layer control information may include at least part or all of OAto 0D. The 0A is radio frame information. The OB is half radio frame information (half system frame information). The 0C is SS / PBCEI block index information. The 0D is subcarrier offset information.

[0149] The radio frame information is used to indicate a radio frame in which the PBCH is transmitted (a radio frame including a slot in which the PBCH is transmitted). The radio frame information is represented by 4 bits. The radio frame information may be represented by 4 bits of a radio frame indicator. The radio frame indicator may include 10 bits. For example, the radio frame indicator may at least be used to identify a radio frame from index 0 to index 1023.

[0150] The half radio frame information is used to indicate whether the PBCH is transmitted in first five subframes or in second five subframes among radio frames in which the PBCH is transmitted. Here, the half radio frame may be configured to include five subframes. The half radio frame may be configured by five subframes of the first half of ten subframes included in the radio frame. The half radio frame may be configured by five subframes in the second half of ten subframes included in the radio frame.

[0151] The SS / PBCH block index information is used to indicate an SS / PBCH block index. The SS / PBCH block index information may be represented by 3 bits. The SS / PBCH block index information may consist of 3 bits of an SS / PBCH block index indicator. The SS / PBCH block index indicator may include 6 bits. The SS / PBCH blockindex indicator may at least be used to identify an SS / PBCH block from index 0 to index 63 (or from index 0 to index 3, from index 0 to index 7, from index 0 to index 9, from index 0 to index 19, etc.).

[0152] The subcarrier offset information is used to indicate subcarrier offset. The subcarrier offset information may be used to indicate the difference between the first subcarrier in which the PBCH is arranged ank the first subcarrier in which the control resource set with index 0 is arranged.

[0153] One or more parameter(s) (e.g. ssb-SubcarrierOffset, pdcch-ConfigSIBl and cell Barred) contained in MIB may indicate that the SIB1 request is available (or SIB1 is not being transmitted). When the parameter(s) indicate that the SIB1 request is available, the cell providing the parameter(s) may be considered as the SIB1 request is available.

[0154] The ssb-SubcarrierOffset may indicate that the SIB1 request is available (or SIB1 is not being transmitted) if thederived by the ssb-SubcarrierOffset is set to a certain value. For example, the ssb-SubcarrierOffset indicate that the SIB 1 request is available (or SIB1 is not being transmitted) if the derived by the ssb-SubcarrierOffset is set to 30 for FR1 or if theis set to 14 for FR 2.

[0155] Alternatively, the ssb-SubcarrierOffset may indicate that the SIB1 request is available (or SIB1 is not being transmitted) if theB derived by the ssb- SubcarrierOffset is set to one value in a certain value range. For example, the ssb- SubcarrierOffset indicate that the SIB1 request is available (or SIB1 is not being transmitted) if at least the fc_SSB derived by the ssb-SubcarrierOffset is set to 31 or one value from 24 to 29 for FR1 or if the is set to 15 or one value from 12 to 13.

[0156] The one or more PBCH payload bit(s) may indicate that the SIB1 request is available (or SIB1 is not being transmitted).

[0157] The UE may trigger to request SIB1 if at least one of following condition is matched or combination of following condition is matched:- the parameter of acquired MIB (e.g. ssb-SubcarrierOffsef) indicates that the SIB1 request is available or indicates that the SIB 1 is not being transmitted- the one or more PBCH payload bit(s) indicates that the SIB1 request is available or indicates that the SIB1 is not being transmitted- cellBarred indicates that the cell is barred or not barred.- the UE is unable to acquire the SIB1- the UE capable of Network Energy Saving (NES) SIB1 request (i.e. capable to request to acquire the SIB1)- during the on-demand SIB 1 procedure

[0158] A PDCCH may be used to transmit downlink control information (DCI). A PDCCH may be transmitted to deliver downlink control information. Downlink control information may be mapped to a PDCCH. The terminal device 1 may receive a PDCCH in which downlink control information is arranged. The BS 3 may transmit the PDCCH in which the downlink control information is arranged.

[0159] Downlink control information may correspond to a DCI format. Downlink control information may be included in a DCI format. Downlink control information may be arranged in each field of a DCI format.

[0160] DCI format is a generic name for DCI format 0_0, DCI format 0_l, DCI format l_0, and DCI format 1_1. Uplink DCI format is a generic name of the DCI format 0_0 and the DCI format 0_l . Downlink DCI format is a generic name of the DCI format l_0 and the DCI format 1_1.

[0161] Radio Network Temporary Identifier (RNTI) is used to differentiate / identify a connected terminal device 1 (UE) in the cell, a specific radio channel, a group of terminal devices 1 in case of paging, a group of terminal devices 1 for which power control is issued by the base station 3, system information transmitted for all the terminal devices 1 by base station 3 (gNB). RNTI is a 16-bit identifier and its value depends on type of RNTI including SI-RNTI, P-RNTI, RA-RNTI, TC-RNTI, C-RNTI, MCS-C- RNTI, CS-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, TPC-SRS-RNTI, INT- RNTI, SFI-RNTI and SP-CSI-RNTI.

[0162] A PDSCH may be used to transmit one or more transport blocks. A PDSCH may be used to transmit one or more transport blocks which corresponds to a DL-SCH. A PDSCH may be used to convey one or more transport blocks. A PDSCH may be used to convey one or more transport blocks which corresponds to a DL-SCH. One or more transport blocks may be arranged in a PDSCH. One or more transport blocks which corresponds to a DL-SCH may be arranged in a PDSCH. The BS 3 may transmit a PDSCH. The terminal device 1 may receive the PDSCH.

[0163] Downlink physical signals may correspond to a set of resource elements. The downlink physical signals may not carry the information generated in the higher-layer. The downlink physical signals may be physical signals used in the downlink component carrier. A downlink physical signal may be transmitted by the BS 3. The downlink physical signal may be transmitted by the terminal device 1. In the wireless communication system according to one aspect of the present embodiment, at least a part or all of an SS (Synchronization signal), DL DMRS (DownLink DeModulation Reference Signal), CSI-RS (Channel State Information-Reference Signal), and DL PTRS (DownLink Phase Tracking Reference Signal) may be used.

[0164] The synchronization signal may be used at least for the terminal device 1 to synchronize in the frequency domain and / or time domain for downlink. The synchronization signal is a generic name of PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

[0165] Figure 8 is a diagram showing a configuration example of an SS / PBCFI block. In Figure 8, the horizontal axis indicates time domain (OFDM symbol index lsym), and the vertical axis indicates frequency domain. The shaded blocks indicate a set of resource elements for a PSS. The blocks of grid lines indicate a set of resource elements for an SSS. Also, the blocks in the horizontal line indicate a set of resource elements for a PBCH and a set of resource elements for a DMRS for the PBCH (DMRS related to the PBCH, DMRS included in the PBCH, DMRS which corresponds to the PBCH).

[0166] As shown in Figure 8, the SS / PBCH block includes a PSS, an SSS, and a PBCH. The SS / PBCH block includes 4 consecutive OFDM symbols. The SS / PBCH block includes 240 subcarriers. The PSS is allocated to the 57th to 183rd subcarriers in the first OFDM symbol. The SSS is allocated to the 57th to 183rd subcarriers in the third OFDM symbol. The first to 56th subcarriers of the first OFDM symbol may be set to zero. The 184th to 240th subcarriers of the first OFDM symbol may be set to zero. The 49th to 56th subcarriers of the third OFDM symbol may be set to zero. The 184th to 192nd subcarriers of the third OFDM symbol may be set to zero. In the first to 240th subcarriers of the second OFDM symbol, the PBCH is allocated to subcarriers in which the DMRS for the PBCH is not allocated. In the first to 48th subcarriers of the third OFDM symbol, the PBCH is allocated to subcarriers in which the DMRS for the PBCH is not allocated. In the 193rd to 240th subcarriers of the third OFDM symbol, the PBCH is allocated to subcarriers in which the DMRS for the PBCH is not allocated. In the first to 240thsubcarriers of the 4th OFDM symbol, the PBCH is allocated to subcarriers in which the DMRS for the PBCH is not allocated.

[0167] The antenna ports of a PSS, an SSS, a PBCH, and a DMRS for the PBCH in an SS / PBCH block may be identical.

[0168] A PBCH may be estimated from a DMRS for the PBCH. For the DM-RS for the PBCH, the channel over which a symbol for the PBCH on an antenna port is conveyed can be inferred from the channel over which another symbol for the DM-RS on the antenna port is conveyed only if the two symbols are within a SS / PBCH block transmitted within the same slot, and with the same SS / PBCH block index.

[0169] DL DMRS is a generic name of DMRS for a PBCH, DMRS for a PDSCH, and DMRS for a PDCCH.

[0170] A set of antenna ports for a DMRS for a PDSCH (a DMRS associated with a PDSCH, a DMRS included in a PDSCH, a DMRS which corresponds to a PDSCH) may be given based on the set of antenna ports for the PDSCH. The set of antenna ports for the DMRS for the PDSCH may be the same as the set of antenna ports for the PDSCH.

[0171] Transmission of a PDSCH and transmission of a DMRS for the PDSCH may be indicated (or scheduled) by one DCI format. The PDSCH and the DMRS for the PDSCH may be collectively referred to as PDSCH. Transmitting a PDSCH may be transmitting a PDSCH and a DMRS for the PDSCH.

[0172] A PDSCH may be estimated from a DMRS for the PDSCH. For a DM-RS associated with a PDSCH, the channel over which a symbol for the PDSCH on one antenna port is conveyed can be inferred from the channel over which another symbol for the DM-RS on the antenna port is conveyed only if the two symbols are within the sameresource as the scheduled PDSCH, in the same slot, and in the same PRG (Precoding Resource Group).

[0173] Antenna ports for a DMRS for a PDCCH (a DMRS associated with a PDCCH, a DMRS included in a PDCCH, a DMRS which corresponds to a PDCCH) may be the same as an antenna port for the PDCCH.

[0174] A PDCCH may be estimated from a DMRS for the PDCCH. For a DM-RS associated with a PDCCH, the channel over which a symbol for the PDCCH on one antenna port is conveyed can be inferred from the channel over which another symbol for the DM-RS on the same antenna port is conveyed only if the two symbols are within resources for which the UE may assume the same precoding being used (i.e. within resources in a REG bundle).

[0175] ABCH (Broadcast CHannel), a UL-SCH (Uplink-Shared CHannel) and a DL- SCH (Downlink-Shared CHannel) are transport channels. A channel used in the MAC layer is called a transport channel. A unit of transport channel used in the MAC layer is also called transport block (TB) or MAC PDU (Protocol Data Unit). In the MAC layer, control of HARQ (Hybrid Automatic Repeat request) is performed for each transport block. The transport block is a unit of data delivered by the MAC layer to the physical layer. In the physical layer, transport blocks are mapped to codewords and modulation processing is performed for each codeword.

[0176] One UL-SCH and one DL-SCH may be provided for each serving cell. BCH may be given to PCell. BCH may not be given to PSCell and SCell.

[0177] A BCCH (Broadcast Control CHannel), a CCCH (Common Control CHannel), and a DCCH (Dedicated Control CHannel) are logical channels. The BCCH is a channel of the RRC layer used to deliver MIB or system information. The CCCH may be used totransmit a common RRC message in a plurality of terminal devices 1. The CCCH may be used for the terminal device 1 which is not connected by RRC. The DCCH may be used at least to transmit a dedicated RRC message to the terminal device 1. The DCCH may be used for the terminal device 1 that is in RRC-connected mode.

[0178] The RRC message includes one or more RRC parameters (information elements, higher layer parameters). For example, the RRC message may include a MIB. For example, the RRC message may include system information (SIB: System Information Block, MIB). SIB is a generic name for various type of SIBs (e.g., SIB1, SIB2). For example, the RRC message may include a message which corresponds to a CCCH. For example, the RRC message may include a message which corresponds to a DCCH. RRC message is a general term for common RRC message and dedicated RRC message.

[0179] The BCCH in the logical channel may be mapped to the BCH or the DL-SCH in the transport channel. The CCCH in the logical channel may be mapped to the DL- SCH or the UL-SCH in the transport channel. The DCCH in the logical channel may be mapped to the DL-SCH or the UL-SCH in the transport channel.

[0180] The UL-SCH in the transport channel may be mapped to a PUSCH in the physical channel. The DL-SCH in the transport channel may be mapped to a PDSCH in the physical channel. The BCH in the transport channel may be mapped to a PBCH in the physical channel.

[0181] A higher-layer parameter is a parameter included in an RRC message or a MAC CE (Medium Access Control Control Element). The higher-layer parameter is a generic name of information included in a MIB, system information, a message which corresponds to CCCH, a message which corresponds to DCCH, and a MAC CE. A higher-layer parameter may be referred to as an RRC parameter or an RRC configuration if the higher-layer parameter is the parameter included in the RRC message.

[0182] A higher-layer parameter may be a cell-specific parameter or a UE-specific parameter. A cell-specific parameter is a parameter including a common configuration in a cell. A UE-specific parameter is a parameter including a configuration that may be configured differently for each UE.

[0183] The BS 3 may indicate change of cell-specific parameters by reconfiguration with random-access. The UE may change cell-specific parameters before triggering random-access. The BS 3 may indicate change of UE-specific parameters by reconfiguration with or without random-access. The UE may change UE-specific parameters before or after random-access.

[0184] The procedure performed by the terminal device 1 includes at least a part or all of the following 5Ato 5C. The 5A is cell search. The 5B is random-access. The 5C is data communication.

[0185] The cell search is a procedure used by the terminal device 1 to synchronize with a cell in the time domain and / or the frequency domain and to detect a physical cell identity. The terminal device 1 may detect the physical cell ID by performing synchronization of time domain and / or frequency domain with a cell by the cell search. The cell search is based on the primary synchronization signal (PSS), secondary synchronization signal (SSS), and PBCH DMRS, located on the synchronization raster.

[0186] A sequence of a PSS is given based at least on a physical cell ID. A sequence of an SSS is given based at least on the physical cell ID.

[0187] An SS / PBCH block candidate indicates a resource for which transmission of the SS / PBCH block may exist. An SS / PBCH block may be transmitted at a resourceindicated as the SS / PBCH block candidate. The BS 3 may transmit an SS / PBCH block at an SS / PBCH block candidate. The terminal device 1 may receive (detect) the SS / PBCH block at the SS / PBCH block candidate.

[0188] A set of SS / PBCH block candidates in a half radio frame is also referred to as an SS-burst-set. The SS-burst-set is also referred to as a transmission window, a SS transmission window, or a DRS transmission window (Discovery Reference Signal transmission window). The SS-burst-set is a generic name that includes at least a first SS- burst-set and a second SS-burst-set.

[0189] The BS 3 transmits SS / PBCH blocks of one or more indexes at a predetermined cycle. The terminal device 1 may detect an SS / PBCH block of at least one of the SS / PBCH blocks of the one or more indexes. The terminal device 1 may attempt to decode the PBCH included in the SS / PBCH block.

[0190] The terminal device 1 assumes that reception occasions of a PBCH, PSS, and SSS are in consecutive symbols, and form a SS / PBCH block. The terminal device 1 assumes that SSS, PBCH DM-RS, and PBCH data have same EPRE. The terminal device 1 may assume that the ratio of PSS EPRE to SSS EPRE in a SS / PBCH block is either OdB or 3dB. If the terminal device 1 has not been provided dedicated higher layer parameters, the terminal device 1 may assume that the ratio of PDCCH DMRS EPRE to SSS EPRE is within -8 dB and 8 dB when the terminal device 1 monitors PDCCHs for a DCI format l_0 with CRC scrambled by SI-RNTI, P-RNTI, or RA-RNTI, or for a DCI format 2_7, or for a DCI format 4_0.

[0191] For a half frame with SS / PBCH blocks, the first symbol indexes for candidate SS / PBCH blocks are determined according to the SCS of SS / PBCH blocks.

[0192] The terminal device 1 can be provided per serving cell by ssb- periodicityServingCell a periodicity of the half frames for reception of the SS / PBCH blocks for the serving cell. If the terminal device 1 is not configured a periodicity of the half frames for receptions of the SS / PBCH blocks, the terminal device 1 assumes a periodicity of a half frame. The terminal device 1 assumes that the periodicity is same for all SS / PBCH blocks in the serving cell.

[0193] For initial cell selection, the terminal device 1 may assume that half frames with SS / PBCH blocks occur with a periodicity of 2 frames.

[0194] The Master Information Block (MIB) on PBCH provides the terminal device1 with parameters (e.g. CORESET#0 configuration) for monitoring of PDCCH for scheduling PDSCH that carries System Information Block 1 (SIB1). PBCH may also indicate that there is no associated SIB1 , in which case the UE may be pointed to another frequency from where to search for an SSB that is associated with a SIB1 as well as a frequency range where the UE may assume no SSB associated with SIB1 is present. The indicated frequency range is confined within a contiguous spectrum allocation of the same operator in which SSB is detected. PBCH may also indicate that associated SIB is absent (there is no associated SIB1 on that time), in which case the terminal device 1 may be provided the configuration for SIB1 request (uplink wakeup signal: UL-WUS) by MIB information or by other information.

[0195] The random-access is a procedure including at least a part or all of message 1 , message 2, message 3, and message 4.

[0196] The message 1 (Msgl, Msg 1) is a procedure (or transmitted signal / channel itself for the procedure) in which the terminal device 1 transmits one or plurality of PRACH. The terminal device 1 transmits one PRACH (one random access preamble) inNNa PRACH occasion (RACH occasion, RO) selected from among one or more ROs based on at least the index of the SS / PBCH block candidate detected based on the cell search. The terminal device 1 may transmit a plurality of PRACHs using a plurality of ROs (can be referred as RO group) selected from among one or more ROs based on at least the index of the SS / PBCH block candidate detected based on the cell search. The RO is a resource in time and frequency domain to transmit a random access preamble.

[0197] When one or a plurality of ROs are configured by higher layer, the terminal device 1 and / or the BS3 assume that a part or all of the one or a plurality of ROs are assumed to be valid ROs with following conditions.

[0198] For paired spectrum (i.e. FDD), or supplementary uplink band, all ROs are assumed to be valid RO.

[0199] For unpaired spectrum, (1) if the terminal device 1 is not provided higher layer parameter tdd-UL-DL-ConfigurationCommon, a RO in a PRACH slot is assumed to be valid RO if it does not precede a SS / PBCH block in the PRACH slot and starts at least Ngapsymbols after a last SS / PBCH block reception symbol, where Ngapis predetermined; (2) if a UE is provided the tdd-UL-DL-ConfigurationCommon, a RO in a PRACH slot is assumed to be valid RO if it is within UL symbols, or if it does not precede a SS / PBCH block in the PRACH slot and starts at least Ngapsymbols after a last downlink symbol and at least Ngapsymbols after a last SS / PBCH block symbol.

[0200] The message 2 (Msg2, Msg 2) is a procedure (or transmitted signal / channel itself for the procedure) in which the terminal device 1 attempts to detect a DCI format l_0 with CRC (Cyclic Redundancy Check) scrambled by an RA-RNTI (Random Access- Radio Network Temporary Identifier). The terminal device 1 may attempt to monitor RA response(s) during the time window called as RAR window. The terminal device 1 mayatempt to detect the DCI format l_0 in a search-space-set while the RAR window is running.

[0201] The message 3 (Msg3, Msg 3) is a procedure (or transmited signal / channel itself for the procedure) for transmitting a PUSCH scheduled by a random-access response grant included in the DCI format l_0 detected in the message 2 procedure. The random-access response grant is indicated by the MAC CE included in the PDSCH scheduled by the DCI format l_0.

[0202] The PUSCH scheduled based on the random-access response grant is either a message 3 PUSCH or a PUSCH. The message 3 PUSCH contains a contention resolution identifier MAC CE. The contention resolution ID MAC CE includes a contention resolution ID.

[0203] Retransmission of the message 3 PUSCH is scheduled by DCI format 0_0 with CRC scrambled by a TC-RNTI (Temporary Cell-Radio Network Temporary Identifier).

[0204] The message 4 (Msg4, Msg 4) is a procedure (or transmited signal / channel itself for the procedure) that attempts to detect a DCI format 1 0 with CRC scrambled by either a C-RNTI (Cell-Radio Network Temporary Identifier) or a TC-RNTI. The terminal device 1 receives a PDSCH scheduled based on the DCI format l_0. The PDSCH may include a collision resolution ID.

[0205] Data communication is a generic term for downlink communication and uplink communication.

[0206] In data communication, the terminal device 1 attempts to detect a PDCCH (atempts to monitor a PDCCH, monitors a PDCCH) in a resource identified at least based on one or all of a control resource set (CORESET) and a search-space-set. It’s also calledas “the terminal device 1 attempts to detect a PDCCH in a control resource set”, “the terminal device 1 attempts to detect a PDCCH in a search-space-set”, “the terminal device 1 attempts to detect a PDCCH candidate in a control resource set”, “the terminal device 1 attempts to detect a PDCCH candidate in a search-space-set”, “the terminal device 1 attempts to detect a DCI format in a control resource set”, or “the terminal device 1 attempts to detect a DCI format in a search-space-set”. Monitoring a PDCCH may be equivalent as monitoring a DCI format in the PDCCH.

[0207] The control resource set (CORESET) is a set of resources configured by the number of resource blocks and a predetermined number of OFDM symbols in a slot. A CORESET consists of a set of PRBs with a time duration of 1 to 3 OFDM symbols. The resource units Resource Element Groups (REGs) and Control Channel Elements (CCEs) are defined within a CORESET with each CCE consisting a set of REGs. Control channels are formed by aggregation of CCE. Different code rates for the control channels are realized by aggregating different number of CCE. Interleaved and non-interleaved CCE-to-REG mapping are supported in a CORESET. The terminal device 1 monitors a set of PDCCH candidates in the configured monitoring occasions in one or more configured CORESETs according to the corresponding search space configurations.

[0208] The set of resources for the control resource set may be indicated by higher- layer parameters. The number of OFDM symbols included in the control resource set may be indicated by higher-layer parameters.

[0209] A PDCCH may be also called as a PDCCH candidate.

[0210] A search-space-set is defined as a set of PDCCH candidates. A search-space- set may be a Common Search Space (CSS) set or a UE-specific Search Space (USS) set.

[0211] The CSS set is a generic name of a type-0 PDCCH CSS set, a type-Oa PDCCH CSS set, a type-1 PDCCH CSS set, a type-2 PDCCH CSS set, and a type-3 PDCCH CSS set. The USS set may be also called as UE-specific PDCCH search-space-set.

[0212] The type-0 PDCCH CSS may be used as a common search-space-set (CSS set) with index 0. The type-0 PDCCH CSS set may be a common search-space-set with index 0. The type-0 PDCCH Common Search Space is a subset of PDCCH Search Space that is dedicated to transmit the PDCCH for SI message (SIB). The type-0 PDCCH CSS set may be a common search-space-set to transmit the PDCCH scheduling SIB1.

[0213] A search-space-set is associated with (included in, corresponding to) a control resource set. The index of the control resource set associated with the search-space-set may be indicated by higher-layer parameters.

[0214] For a search-space-set, a part or all of 6A to 6C may be indicated at least by higher-layer parameters. The 6A is PDCCH monitoring period. The 6B is PDCCH monitoring pattern within a slot. The 6C is PDCCH monitoring offset.

[0215] A monitoring occasion of a search-space-set may correspond to one or more OFDM symbols in which the first OFDM symbol of the control resource set associated with the search-space-set is allocated. A monitoring occasion of a search-space-set may correspond to resources identified by the first OFDM symbol of the control resource set associated with the search-space-set. A monitoring occasion of a search-space-set is given based at least on a part or all of PDCCH monitoring periodicity, PDCCH monitoring pattern within a slot, and PDCCH monitoring offset.

[0216] Figure 9 is a diagram showing an example of the monitoring occasion of the search-space-set. In Figure 9, the search-space-set 91 and the search-space-set 92 are setsin the primary cell 301 , the search-space-set 93 is a set in the secondary cell 302, and the search-space-set 94 is a set in the secondary cell 303.

[0217] In Figure 9, the block indicated by the grid line indicates the search-space-set 91, the block indicated by the upper right diagonal line indicates the search-space-set 92, the block indicated by the upper left diagonal line indicates the search-space-set 93, and the block indicated by the horizontal line indicates the search-space-set 94.

[0218] In Figure 9, the PDCCH monitoring periodicity for the search-space-set 91 is set to 1 slot, the PDCCH monitoring offset for the search-space-set 91 is set to 0 slot, and the PDCCH monitoring pattern for the search-space-set 91 is [1 , 0, 0, 0, 0, 0, 0, 1 , 0, 0, 0, 0, 0, 0], That is, the monitoring occasion of the search-space-set 91 corresponds to the first OFDM symbol (OFDM symbol # 0) and the eighth OFDM symbol (OFDM symbol # 7) in each of the slots.

[0219] In Figure 9, the PDCCH monitoring periodicity for the search-space-set 92 is set to 2 slots, the PDCCH monitoring offset for the search-space-set 92 is set to 0 slots, and the PDCCH monitoring pattern for the search-space-set 92 is [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]. That is, the monitoring occasion of the search-space-set 92 corresponds to the leading OFDM symbol (OFDM symbol # 0) in each of the even slots.

[0220] In Figure 9, the PDCCH monitoring periodicity for the search-space-set 93 is set to 2 slots, the PDCCH monitoring offset for the search-space-set 93 is set to 0 slots, and the PDCCH monitoring pattern for the search-space-set 93 is [0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0]. That is, the monitoring occasion of the search-space-set 93 corresponds to the eighth OFDM symbol (OFDM symbol # 8) in each of the even slots.

[0221] In Figure 9, the PDCCH monitoring periodicity for the search-space-set 94 is set to 2 slots, the PDCCH monitoring offset for the search-space-set 94 is set to 1 slot,and the PDCCH monitoring pattern for the search-space-set 94 is [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], That is, the monitoring occasion of the search-space-set 94 corresponds to the leading OFDM symbol (OFDM symbol # 0) in each of the odd slots.

[0222] The type-0 PDCCH CSS set may be at least used for a DCI format with a cyclic redundancy check (CRC) sequence scrambled by an SI-RNTI (System Information-Radio Network Temporary Identifier).

[0223] SI-RNTI is used for broadcast of system information. It is a common RNTI meaning that, it is not allocated to any UE explicitly and common to all UEs in the cell. SI-RNTI is of 16-bit in length and its value may be fixed to 65535 (OxFFFF). A single SI- RNTI is used to address all SI messages. Broadcast of System Information uses BCCH logical channel which is then mapped to DL-SCH transport channel which intern mapped to PDSCH physical channel. The terminal devices 1 should know the scheduling information for PDSCH which is carrying System Information. The required scheduling information is contained in DCI (Downlink Control Information) whose CRC is scrambled by SI-RNTI. The terminal device 1 starts decoding PDCCH scrambled with SI-RNTI at the start of SI Window (for the concerned SI message) until the end of the SI window, or until the SI message was received excluding the following subframes.

[0224] The type-Oa PDCCH CSS set may be used at least for a DCI format with a cyclic redundancy check sequence scrambled by an SI-RNTI.

[0225] The type-1 PDCCH CSS set may be used at least for a DCI format with a CRC sequence scrambled by an RA-RNTI (Random Access-Radio Network Temporary Identifier) or a CRC sequence scrambled by a TC-RNTI (Temporary Cell-Radio Network Temporary Identifier).

[0226] TC-RNTI is used during Random Access procedure, the base station 3’s MAC generates Random Access Response (RAR) as a response to the Random Access Preamble transmitted by the terminal device 1. The MAC RAR contains TC-RNTI. During contention based random access procedure, the terminal device 1 stores received TC-RNTI (received in RAR) and uses it during random access procedure. The terminal device 1 shall discard the TC-RNTI value received in RAR during non-contention based random access procedure. The terminal device 1 shall use TC-RNTI for scrambling of msg3 (PUSCH corresponding to RAR grant) and its retransmissions. During contention based RA procedure, the terminal device 1 monitors PDCCH scrambled with TC-RNTI. The TC-RNTI is promoted to C-RNTI for a terminal device 1 which detects RA success and does not already have a C-RNTI.

[0227] The type-2 PDCCH CSS set may be used for a DCI format with a CRC sequence scrambled by P-RNTI (Paging-Radio Network Temporary Identifier).

[0228] P-RNTI is used by the terminal devices 1 for the reception of paging. It is common RNTI meaning that it is not allocated to any terminal device 1 explicitly. P- RNTI is of 16-bit in length and its value may be fixed to 65534 (OxFFFE). Paging message is carried by PCCH logical channel which is mapped to PCH transport channel. The PCH transport channel is mapped to PDSCH physical channel. The base station 3 scrambles PDCCH’s CRC with P-RNTI for transmission of PDSCH that carries paging information DCI Formats which carries scheduling information for paging.

[0229] The type-3 PDCCH CSS set may be used for a DCI format with a CRC sequence scrambled by a C-RNTI (Cell-Radio Network Temporary Identifier).

[0230] C-RNTI is a unique identification used for identifying RRC Connection and scheduling which is dedicated to a particular terminal device 1. The base station 3 assignsdifferent C-RNTI values to different terminal devices 1. The base station 3 uses C-RNTI to allocate a terminal device 1 with uplink grants, downlink assignments, etc. C-RNTI is used by base station 3 to differentiate uplink transmissions (e.g. PUSCH, PUCCH) of a terminal device 1 from others.

[0231] The UE-specific search-space-set (USS set) may be used at least for a DCI format with a CRC sequence scrambled by a C-RNTI.

[0232] In downlink communication, the terminal device 1 may detect a downlink DCI format. The detected downlink DCI format is at least used for resource assignment for a PDSCH. The detected downlink DCI format is also referred to as downlink assignment. The terminal device 1 attempts to receive the PDSCH. Based on a PUCCH resource indicated based on the detected downlink DCI format, an HARQ-ACK corresponding to the PDSCH (HARQ-ACK corresponding to a transport block included in the PDSCH) may be reported to the BS 3.

[0233] In uplink communication, the terminal device 1 may detect an uplink DCI format. The detected uplink DCI format is at least used for resource assignment for a PUSCH. The detected uplink DCI format is also referred to as uplink grant. The terminal device 1 transmits the PUSCH.

[0234] PUSCH transmi ssion(s) can be dynamically scheduled by an UL grant in a DCI, or the transmission can correspond to a configured grant Type 1 or Type 2. The configured grant Type 1 PUSCH transmission is semi-statically configured to operate upon the reception of higher layer parameter of configuredGrantConfig including rrc- ConfiguredUplinkGrant without the detection of an UL grant in a DCI. The configured grant Type 2 PUSCH transmission is semi-persistently scheduled by an UL grant in a valid activation DCI according to those procedure(s) after the reception of higher layerparameter configuredGrantConfig not including rrc-ConfiguredUplinkGrant. If configuredGrantConfigToAddModList is configured, more than one configured grant configuration of configured grant Type 1 and / or configured grant Type 2 may be active at the same time on an active BWP of a serving cell.

[0235] A Public Land Mobile Network (PLMN) is a network established and operated by an Administration or RPOA for the specific purpose of providing land mobile communication services to the public. It provides communication possibilities for mobile users. For communications between mobile and fixed users, interworking with a fixed network is necessary. A PLMN may provide service in one, or a combination, of frequency bands. As a rule, a PLMN is limited by the borders of a country. Depending on national regulations there may be more than one PLMN per country. A relationship exists between each subscriber and his home PLMN (HPLMN). If communications are handled over another PLMN, this PLMN is referred to as the visited PLMN (VPLMN).

[0236] A user equipment (UE) is described. The UE may comprise processing circuitry configured to perform initial cell selection to find a first cell to camp on, and transmission circuitry configured to transmit a request of system information transmission prior to camp on the first cell.

[0237] The UE may also comprise the transmission circuitry configured to transmit the request for a second cell if the second cell is available for the request.

[0238] The UE may also comprise the transmission circuitry configured to transmit the request for a second cell if the second cell is available for the request and if reception power of the second cell is larger than a threshold.

[0239] A base station is described. The base station may comprise processing circuitry configured to make terminal device to perform initial cell selection to find a firstcell to camp on, and reception circuitry configured to receive a request of system information transmission prior to camp on the first cell.

[0240] The base station may also comprise the reception circuitry configured to receive the request for a second cell if the second cell is available for the request.

[0241] A method performed by a user equipment is described. The method may comprise performing initial cell selection to find a first cell to camp on, and transmitting a request of system information transmission prior to camp on the first cell.

[0242] The reception circuitry comprised in the UE may be the Wireless transmission / reception unit 10 in Figure 6. The processing circuitry comprised in the UE may be the Higher-layer processing unit 14 in Figure 6. The transmission circuitry comprised in the UE may be the Wireless transmission / reception unit 10 in Figure 6.

[0243] The transmission circuitry comprised in the base station may be the Wireless transmission I reception unit 30 in Figure 5. The processing circuitry comprised in the base station may be the Higher-layer processing unit 34 in Figure 5. The reception circuitry comprised in the UE may be the Wireless transmission / reception unit 30 in Figure 5.

[0244] Hereinafter, cell categories are described.

[0245] An acceptable cell is described. The acceptable cell may be a cell on which the UE may camp to obtain limited service (originate emergency calls and receive ETWS and CMAS notifications). Such a cell shall fulfil the following requirements, which is the minimum set of requirements to initiate an emergency call and to receive ETWS and CMAS notification in an NR network:- The cell is not barred;- The cell selection criteria are fulfilled.

[0246] A suitable cell is described. A cell may be considered as suitable cell if the following conditions are fulfilled:- The cell is part of either the selected PLMN (Public Land Mobile Network) or the registered PLMN or PLMN of the Equivalent PLMN list, and for that PLMN either:- The PLMN-ID of that PLMN is broadcast by the cell with no associated CAG-IDs and CAG-only indication in the UE for that PLMN is absent or false;- Allowed CAG list in the UE for that PLMN includes a CAG-ID broadcast by the cell for that PLMN;- The cell selection criteria are fulfilled.According to the latest information provided by NAS:- The cell is not barred;- The cell is part of at least one TA that is not part of the list of "Forbidden Tracking Areas for Roaming", which belongs to a PLMN that fulfils the first bullet above.

[0247] A barred cell is described. A cell may be barred if it is so indicated in the system information.

[0248] Definition of camped on a cell is described. When UE camped on a cell, UE may have completed the cell selection / reselection process and have chosen a cell. The UE may monitor system information and (in most cases) paging information.

[0249] Definition of camped on any cell is described. UE may be in idle mode and may have completed the cell selection / reselection process and may have chosen a cell irrespective of PLMN identity.

[0250] Cell selection process is described as shown in figure 11. The terminal device 1 may initiate cell selection procedure. The terminal device 1 may transmit a request of system information transmission for the base station during scanning all RF channels.Alternatively, the terminal device 1 may transmit a request of system information transmission for the base station after scanning all RF channels (i.e. transmit the request if suitable cell is not found for all RFs without the request). The terminal device 1 may acquire the requested system information that includes information to find the suitable cell for the terminal device 1. The terminal device 1 may determine the suitable cell. The terminal device 1 may camp on this cell.

[0251] Cell selection process is described. Figure 12 shows the states and state transitions and procedures in RRC_IDLE and RRC_INACTIVE. Cell selection may be performed by one of the following two procedures:

[0252] a) Initial cell selection 1201 (no prior knowledge of which RF channels are NR frequencies):1. The UE may scan all RF channels in the NR bands according to its capabilities to find a suitable cell. The UE may request system information transmission for gNB during the scanning all RF channels.2. On each frequency, the UE may need only search for the strongest cell, except for operation with shared spectrum channel access where the UE may search for the next strongest cell(s).3. Once a suitable cell is found, this cell may be selected, (i.e. The UE may camp on this cell)

[0253] b) Cell selection by leveraging stored information 1202:1 . This procedure may require stored information of frequencies and optionally also information on cell parameters from previously received measurement control information elements or from previously detected cells.2. Once the UE has found a suitable cell, the UE may select it.3. If no suitable cell is found, the initial cell selection procedure in a) may be started.

[0254] A first base station which is not transmitting SIB1 may indicate that the SIB1 request is available in order to have its own cell found as suitable cell by UE. If the UE is indicated that the request of SIB1 is available, the UE may transmit a request of the SIB1 transmission for the cell. Then, the UE may receive the SIB1 and the UE may determine the cell as suitable cell and the UE may camp on the cell.

[0255] Alternatively, a second base station which is transmitting SIB1 may indicate that the SIB1 request is available in order to have the cell of the first base station found as suitable cell by UE.

[0256] Alternatively, if the UE is indicated that the request of SIB 1 is available by the cell, the UE may transmit a request of the SIB1 transmission for the cell.

[0257] Alternatively, if the UE is indicated that the request of SIB1 is available by the cell, the UE may transmit a request of the SIB1 transmission for the other cell.

[0258] Alternatively, if the reception power of the cell is larger than a threshold, the UE may transmit a request of the SIB1 transmission for the cell.

[0259] Alternatively, if the reception power of the cell is larger than a threshold, the UE may transmit a request of the SIB1 transmission for the other cell. The threshold may be provided by MIB, PBCH payload, system information, or pre-determined table.

[0260] During initial cell selection procedure, prior to camp on the cell, UE capable to request the SIB1 may request the SIB1 if the cell indicates that the SIB1 request is available.

[0261] Cell selection criterion which is used to determine acceptable cell and suitable cell is described.

[0262] The cell selection criterion S is fulfilled when:Srxlev>0 AND Squal > 0 where:Srxlev = Qrxlevmeas - (Qrxlevmin + Qrxlevminoffset )- Pcompensation - Qoffsettemp Squal = Qqualmeas - (Qqualmin + Qqualminoffset) - Qoffsettemp where:- Srxlev is cell selection RX level value (dB)- Squal is cell selection quality value (dB)- Qoffsettemp is offset temporarily applied to a cell (dB)- Qrxlevmeas is measured cell RX level value (RSRP)- Qqualmeas is measured cell quality value (RSRQ)- Qrxlevmin is minimum required RX level in the cell (dBm).- Qqualmin is minimum required quality level in the cell (dB).- Qrxlevminoffset is offset to the signalled Qrxlevmin taken into account in the Srxlev evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN.- Qqualminoffset is offset to the signalled Qqualmin taken into account in the Squal evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN.- Pcompensation is, for FR1, if the UE supports the additionalPmax in the NR-NS- PmaxList, if present, in SIB 1 , SIB2 and SIB4: max(PEMAXl -PPowerClass, 0) - (min(PEMAX2, PPowerClass) - min(PEMAXl, PPowerClass)) (dB); else:max(PEMAXl -PPowerClass, 0) (dB).- P EMAXI , PEMAX2 is Maximum TX power level of a UE may use when transmiting on the uplink in the cell (dBm) defined. If UE supports SUL frequency for this cell, PEMAX1 and PEMAX2 are obtained from the p-Max for SUL in SIB1 and NR-NS- PmaxList for SUL respectively in SIB1, SIB2 and SIB4, else PEMAX1 and PEMAX2 are obtained from the p-Max and NR-NS-PmaxList respectively in SIB1, SIB2 and SIB4 for normal UL.- PpowerClass is maximum RF output power of the UE (dBm) according to the UE power class.

[0263] Hereinafter, procedure of acquisition of MIB and SIB is described. In this embodiment, the number written before the sentence of the procedure represents the level of the if statement. For example, procedure or action may be written as following: 1> if condition 1 is true,2> the UE perform A.2> if condition 2 is true,3> the UE perform B.2> else,3> the UE perform C.1> the UE perform D.In this example procedure, if condition 1 is true and condition 2 is true, then, the UE perform A, B, and D. If condition 1 is true and condition 2 is false, then, the UE perform A, C, and D. If condition 1 is false, then, the UE perform D.

[0264] T311 is a timer which may start upon initiating the RRC connection reestablishment procedure. The T311 may stop upon selection of a suitable NR cell, or uponselection of a suitable L2 U2N Relay UE, or a cell using another RAT. When the T311 expires, the UE enter RRC JDLE.

[0265] Procedure of acquisition of MIB and SIB1 is described.1> The UE may apply the specified BCCH configuration.1> If the UE is in RRCJDLE or in RRCJNACTIVE, or1> if the UE is in RRC_CONNECTED while T311 is running,2> the UE may acquire the MIB.2> if the UE is unable to acquire the MIB,3> perform the actions of essential system information missing.2> else (i.e. if the UE is able to acquire the MIB),3> the UE may perform the actions upon reception of the MIB.1> if the UE is in RRCJDLE or in RRCJNACTIVE, or1> if the UE is in RRC_CONNECTED while T311 is running,2> if ssb-SubcarrierOffset indicates SIB1 is transmitted in the cell and if SIB1 acquisition is required for the UE,3> the UE may acquire the SIB1.3> if the UE is unable to acquire the SIB1,4> the UE may perform the actions of essential system information missing.3> else (i.e. if the UE is able to acquire the SIB 1),4> perform the actions upon reception of the SIB1.

[0266] Actions upon reception of the MIB is described.1> The UE may store the acquired MIB.1> if the UE is in RRCJDLE or in RRCJNACTIVE, or if the UE is inRRC J2ONNECTED while T311 is running2> if the access is not for NTN or the UE is not capable of NTN or the UE is not capable of NES cell DTX / DRX, and2> if the access is not for ATG or the UE is not capable of ATG, and2> if the cellBarred in the acquired MIB is set to barred,3> if the UE is an (e)RedCap UE and ssb-SubcarrierOffset indicates SIB1 is transmitted in the cell,4> the UE may acquire the SIB1.3> the UE may consider the cell as barred.3> the UE may perform cell re-selection to other cells on the same frequency as the barred cell.2> else:3> the UE may apply the received systemFrameNumber, pdcch-ConfigSIBl, subCarrierSpacingCommon, ssb-SubcarrierOffset and dmrs-TypeA-Position.

[0267] Actions when essential system information missing is described.1> if in RRC IDLE or in RRC INACTIVE or in RRC_CONNECTED while T311 is running,2> if the UE is unable to acquire the MIB,3> the UE may consider the cell as barred.3> the UE may perform barring as if intraFreqReselection, or intraFreqReselectionRedCap for RedCap UEs, or intraFreqReselection-eRedCap for eRedCap UEs, is set to allowed',2> else if the UE is unable to acquire the SIB1,3> the UE may consider the cell as barred.3> if the UE is a RedCap UE:4> the UE may perform barring as if intraFreqReselectionRedCap is set to allowed.'3> else if the UE is an eRedCap UE:4> the UE may perform barring as if IntraFreqReselection-eRedCap is set to allowed,' 3> else:4> the UE may perform cell re-selection to other cells on the same frequency as the barred cell.

[0268] Each of a program running on the BS 3 and the terminal device 1 according to an aspect of the present invention may be a program that controls a Central Processing Unit (CPU) and the like, such that the program causes a computer to operate in such a manner as to realize the functions of the above -described embodiment according to the present invention. The information handled in these devices is transitorily stored in a Random-Access-Memory (RAM) while being processed. Thereafter, the information is stored in various types of Read-Only-Memory (ROM) such as a Flash ROM and a Hard- Disk-Drive (HDD), and when necessary, is read by the CPU to be modified or rewritten.

[0269] Note that the terminal device 1 and the BS 3 according to the above-described embodiment may be partially achieved by a computer. In this case, this configuration may be realized by recording a program for realizing such control functions on a computer- readable recording medium and causing a computer system to read the program recorded on the recording medium for execution.

[0270] Note that it is assumed that the "computer system" mentioned here refers to a computer system built into the terminal device 1 or the BS 3, and the computer system includes an OS and hardware components such as a peripheral device. Furthermore, the "computer-readable recording medium" refers to a portable medium such as a flexibledisk, a magneto -optical disk, a ROM, a CD-ROM, and the like, and a storage device built into the computer system such as a hard disk.

[0271] Moreover, the "computer-readable recording medium" may include a medium that dynamically retains a program for a short period of time, such as a communication line that is used to transmit the program over a network such as the Internet or over a communication line such as a telephone line, and may also include a medium that retains a program for a fixed period of time, such as a volatile memory within the computer system for functioning as a server or a client in such a case. Furthermore, the program may be configured to realize some of the functions described above, and also may be configured to be capable of realizing the functions described above in combination with a program already recorded in the computer system.

[0272] Furthermore, the BS 3 according to the above-described embodiment may be achieved as an aggregation (an device group) including multiple devices. Each of the devices configuring such an device group may include some or all of the functions or the functional blocks of the BS 3 according to the above-described embodiment. The device group may include each general function or each functional block of the BS 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the BS 3 as the aggregation.

[0273] Furthermore, the BS 3 according to the above-described embodiment may serve as an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and / or NG- RAN (Next Gen RAN, NR-RAN). Furthermore, the BS 3 according to the abovedescribed embodiment may have some or all of the functions of a node higher than an eNodeB or the gNB.

[0274] Furthermore, some or all portions of each of the terminal device 1 and the BS 3 according to the above-described embodiment may be typically achieved as an LSI which is an integrated circuit or may be achieved as a chip set. The functional blocks of each of the terminal device 1 and the BS 3 may be individually achieved as a chip, or some or all of the functional blocks may be integrated into a chip. Furthermore, a circuit integration technique is not limited to the LSI, and may be realized with a dedicated circuit or a general-purpose processor. Furthermore, in a case that with advances in semiconductor technology, a circuit integration technology with which an LSI is replaced appears, it is also possible to use an integrated circuit based on the technology.

[0275] Furthermore, according to the above-described embodiment, the terminal device has been described as an example of a communication device, but the present invention is not limited to such a terminal device, and is applicable to a terminal device or a communication device of a fixed-type or a stationary-type electronic device installed indoors or outdoors, for example, such as an Audio-Video (AV) device, a kitchen device, a cleaning or washing machine, an air-conditioning device, office equipment, a vending machine, and other household devices.

[0276] Furthermore, according to the above-described embodiment, the words / parameters described by Italic may be RRC parameter, higher layer parameter, PC5-RRC parameter and / or preconfigured parameter.

[0277] The embodiments of the present invention have been described in detail above referring to the drawings, but the specific configuration is not limited to the embodiments and includes, for example, an amendment to a design that falls within the scope that does not depart from the gist of the present invention. Furthermore, various modifications are possible within the scope of one aspect of the present invention defined by claims, andembodiments that are made by suitably combining technical means disclosed according to the different embodiments are also included in the technical scope of the present invention. Furthermore, a configuration in which constituent elements, described in the respective embodiments and having mutually the same effects, are substituted for one another is also included in the technical scope of the present invention.

Claims

[CLAIMS]1. A user equipment (UE), comprising: processing circuitry configured to perform initial cell selection to find a first cell to camp on; and transmission circuitry configured to transmit a request of system information transmission prior to camp on the first cell.

2. The UE according to the claim 1, wherein the transmission circuitry is configured to transmit the request for a second cell if the second cell is available for the request.

3. The UE according to the claim 1, wherein the transmission circuitry is configured to transmit the request for a second cell if the second cell is available for the request and if reception power of the second cell is larger than a threshold.

4. A base station, comprising: processing circuitry configured to make terminal device to perform initial cell selection to find a first cell to camp on; and reception circuitry configured to receive a request of system information transmission prior to camp on the first cell.

5. The base station according to the claim 4, whereinthe reception circuitry is configured to receive the request for a second cell if the second cell is available for the request.

6. A method performed by a user equipment, comprising: performing initial cell selection to find a first cell to camp on; and transmitting a request of system information transmission prior to camp on the first cell.

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