User equipments, base stations and methods

Abstract

A user equipment (UE) is described. The UE comprises processing circuitry to receive a first parameter which indicates a first periodicity of first SS / PBCH block and a second parameter which indicates a second periodicity of second SS / PBCH block, and reception circuitry configured to receive PDSCH on PRB(s), wherein the UE assumes that a PRB containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block.

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 SS / PBCH block transmission for 15 kHz SCS with carrier frequencies larger than 3 GHz;

[0014] Figure 10 is a diagram showing an example of the monitoring occasion of the search-space-set;

[0015] Figure 11 is a diagram showing an example of adaptation of SSB periodicity;

[0016] Figure 12 is a diagram showing an example of adaptation of actual SSB transmissions in a half frame;

[0017] Figure 13 is an example of a method for a terminal device 1;

[0018] Figure 14 is an example of a method for a base station 3;

[0019] Figure 15 is another example of a method for a terminal device 1;

[0020] Figure 16 is another example of a method for a base station 3.[Description of Embodiments]

[0021] A user equipment (UE) is described. The UE may comprise reception circuitry configured to receive a first parameter which indicates a first periodicity of first SS / PBCH block and configured to receive a second parameter which indicates a second periodicity of second SS / PBCH block. The UE may comprise reception circuitry configured to receive a PDSCH on physical resource block(s). The UE may assumes that a physical resource block containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block.

[0022] The processing circuitry may be configured to monitor one of the first SS / PBCH block and the second SS / PBCH block.

[0023] The first periodicity may be shorter than the second periodicity.

[0024] The first parameter and the second parameter may be associated with a same physical cell ID (PCI).

[0025] The first parameter and the second parameter may be associated with a same TCI.

[0026] A same parameter may applies to the first SS / PBCH block and the second SS / PBCH block.

[0027] A base station is described. The base station may comprise processing circuitry configured to transmit a first parameter which indicates a first periodicity of first SS / PBCH block, and configured to transmit a second parameter which indicates a secondperiodicity of second SS / PBCH block. The base station may comprise transmission circuitry configured to transmit a PDSCH on physical resource block(s). The base station may assumes that a physical resource block containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block.

[0028] The first periodicity may be shorter than the second periodicity.

[0029] The first parameter and the second parameter may be associated with a samePCI.

[0030] The first parameter and the second parameter may be associated with a same TCI.

[0031] A same parameter may applies to the first SS / PBCH block and the second SS / PBCH block.

[0032] A method performed by a user equipment (UE) is described. The method may comprise receiving a first parameter which indicates a first periodicity of first SS / PBCH block and receiving a second parameter which indicates a second periodicity of second SS / PBCH block. The method may comprise receiving a PDSCH on physical resource block(s). In the method, the UE may assume that a physical resource block containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block.

[0033] A user equipment (UE) is described. The UE may comprise processing circuitry configured to receive a first parameter which indicates a first periodicity of first SS / PBCH block and a second parameter which indicates a second periodicity of second SS / PBCH block. The UE may comprise reception circuitry configured to perform measurement. The measurement may be performed for a transmitted SS / PBCH block.

[0034] The UE may comprise determination circuitry configured to determine the transmitted SS / PBCH block.

[0035] The transmitted SS / PBCH block may be one of the first SS / PBCH block and the second SS / PBCH block.

[0036] The receiving circuitry may be configured to receive an indication indicating the transmitted SS / PBCH block.

[0037] The indication may be received on PDCCH.

[0038] The first parameter and the second parameter may be associated with a same physical cell ID (PCI).

[0039] The first parameter and the second parameter may be associated with a same TCI.

[0040] A same parameter may applies to the first SS / PBCH block and the second SS / PBCH block.

[0041] A base station is described. The base station may comprise processing circuitry configured to transmit a first parameter which indicates a first periodicity of first SS / PBCH block and a second parameter which indicates a second periodicity of second SS / PBCH block. The base station may comprise transmission circuitry configured to transmit an indication indicating a one of the first SS / PBCH block and the second SS / PBCH block to perform a measurement.

[0042] A method performed by a user equipment (UE) is described. The method may comprise receiving a first parameter which indicates a first periodicity of first SS / PBCH block and receiving a second parameter which indicates a second periodicity of second SS / PBCH block. The method may comprise performing measurement for a transmittedSS / PBCH block.

[0043] floor (CX) 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 the remainder 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) = e GX. Here, e is Napier number. (HX)A(IX) indicates IX to the power of HX.

[0044] 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).

[0045] 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.

[0046] 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).

[0047] 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_INACTIVE state,

[0048] 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).

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 referredto as numerology. A resource grid includes NSIZCi"grid. ^N^sc subcarriers. The resource grid starts from a common resource block with index Nstart’ “grid. The common resource block with the index Nstart>"grid is also referred to as a reference point of the resource grid. The resource grid includes Nsubframe’ ”symb OFDM symbols. The subscript x indicates the transmission direction and indicates either downlink or uplink. One resource grid is provided 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.

[0053] Resource grid is also referred to as carrier.

[0054] Nslze’ "grid,^ and Nstart> "gnd 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.

[0055] 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), Ns!otsymb = 14, Nframe’ “slot = 40, Nsubframe’ "siot = 4. 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), Nslotsymb = 12, N&ame> "slot = 40, Nsubframe’ "slot = 4. The subcarrier-spacing configuration u may be applied to downlink, uplink and / or sidelink.

[0056] In the wireless communication system, a time unit Tcmay be used to represent the length of the time domain. The time unit Tcis Tc= 1 / (dfmax * Nf). It is dfmax = 480 kHz. It is Nf = 4096. The constant k is k = dfmax * Nf / (dfrefNf,ref) = 64. dfref is 15 kHz. Nf, ref is 2048.

[0057] 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 Tf = (dfmax Nf / 100) * Ts= 10 ms. One radio frame is configured to include ten subframes. The subframe length is TSf= (dfmaxNf / 1000) Ts= 1 ms. The number of OFDM symbols per subframe is Nsubframe>wsymb= Nsl0tSymbNSubframe>Wslot-

[0058] For a subcarrier-spacing configuration u, the number of slots included in a subframe and indexes may be given. For example, slot index nHsmay be given in ascending order with an integer value ranging from 0 to Nsubfi'ame’"siot -1 in a subframe. For subcarrier-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 n“s, f may be given in ascending order with an integer value ranging from 0 to Nframe’usiot -1 in the radio frame. Consecutive NslotSymb OFDM symbols may be included in one slot. It is Nslotsymb = 14.

[0059] 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 u = u\ in the component carrier 300 and a configuration example of a resource grid of subcarrierspacing configuration u = ui in a component carrier. One or more subcarrier-spacing configuration may be set for a component carrier. Although it is assumed in Figure 3 thatu\ = «2-l, various aspects of this embodiment are not limited to the condition of MI = uz- 1.

[0060] The component carrier 300 is a band having a predetermined width in the frequency domain.

[0061] 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 MI .

[0062] 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.

[0063] 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 MI. The resource grid 3001 includes Nsize,“gridi^ common resource blocks starting from the reference point of the resource grid 3001.

[0064] The offset 3013 is an offset from the reference point of the resource grid 3001 to the reference point (Nstart’uBWP,zi) of the BWP (Bandwidth Part) 3003 of the index zl .

[0065] Common resource block-set 3200 is a set of common resource blocks with respect to subcarrier-spacing configuration U2.

[0066] 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 referencepoint of the common resource block-set 3200 may be a common resource block with index 0 in the common resource block-set 3200.

[0067] 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 is indicated by the number of common resource blocks for subcarrier-spacing configuration u = U2. The resource grid 3002 includes Ns’ze,“grid2^ common resource blocks starting from the reference point of the resource grid 3002.

[0068] The offset 3014 is an offset from the reference point of the resource grid 3002 to the reference point (Nstart’lhwp, / 2) of the BWP 3004 with index h.

[0069] 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 index Zsym, and the vertical axis indicates the subcarrier index ksc. The resource grid 3001 includes Nslze’ugridi .xN^sc subcarriers, and includes Nsubframes’usymbOFDM symbols. A resource specified by the subcarrier index kscand the OFDM symbol index Zsymin a resource grid is also referred to as a resource element (RE).

[0070] 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 N^sc = 12.

[0071] 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.

[0072] 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 A'CRB of the common resource block with respect to the subcarrier-spacing configuration u satisfies the relationship of A'CRB = ceil (ksc / NRBSC). The 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.

[0073] 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 M“PRB of the physical resource block with respect to the subcarrier-spacing configuration u satisfies the relationship of «"CRB = «"PRB + N^^BWER The NstarUBWP,i indicates the reference point of BWP with index i.

[0074] A BWP is defined as a subset of common resource blocks included in the resource grid. The BWP includes Nsize>"BWPJ common resource blocks starting from the reference points Nstart’“BWP, / . 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.

[0075] 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.

[0076] 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.

[0077] 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 of aggregated downlink component carriers. Carrier aggregation may be communication using a plurality of aggregated uplink component carriers.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] The medium access control layer processing unit 35 included in the higher- layer processing unit 34 performs processing of the MAC layer.

[0082] 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.

[0083] 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.

[0084] The wireless transmission / reception unit 30 (or the wireless reception unit 30b) performs processing such as demodulation and decoding. The wireless transmission I 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 I reception unit 30 (or the wireless reception unit 30b) may perform the channel access procedure prior to the transmission of the physical signal,

[0085] 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) on physical broadcast channel (PBCH). The wireless transmission / reception unit 30 may have a function to transmit a first parameter which indicates a first periodicity of first SS / PBCH block, and a second parameter which indicates a second periodicity of second SS / PBCH block. The wireless transmission / reception unit 30 may have a function to transmit a PDSCH on physical resource block(s).

[0086] 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.

[0087] 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 fromwhich the CP has been removed. The baseband unit 33 provides the physical signal in the frequency domain.

[0088] The baseband unit 33 performs Inverse Fast Fourier Transformation (IFFT) on downlink 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 33 provides the analog signal to the RF unit 32.

[0089] 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.

[0090] 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.

[0091] 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).

[0092] 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.

[0093] 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)

[0094] A SCell may be included in either an MCG or a SCG.

[0095] 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.

[0096] One or more downlink BWPs 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).

[0097] 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 BWP (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).

[0098] 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.

[0099] 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 downlink control information. The downlink BWP switching may be controlled based on higher- layer parameters.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] The aforementioned procedures for Uplink BWP may be applicable to Sidelink BWP.

[0104] 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 / reception unit (physical layer processing unit) 10 and the higher-layer processing unit 14. The wireless transmission / 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.

[0105] The wireless transmission I 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 the configuration 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.

[0106] 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.

[0107] The medium access control layer processing unit 15 included in the higher- layer processing unit 14 performs processing of the MAC layer.

[0108] 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 / orPC5 RRC parameters based on the PC5 RRC (PC5-RRC) message received from another terminal device 1.

[0109] The wireless transmission / reception unit 10 (or the wireless transmission unit 10a) performs processing such as encoding and modulation. The wireless transmission / 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 I 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 B WP (active uplink BWP) and transmit the baseband signal (or the physical signal) to the BS 3.

[0110] 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 / reception unit 10 (or the wireless reception unit 10b) may perform the channel access procedure prior to the transmission of the physical signal.

[0111] The wireless transmission I 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 to receive a master information block (MIB). The wireless transmission / reception unit 10 may have a function to receive a first parameter which indicates a first periodicity of first SS / PBCH block, and a second parameter which indicates a second periodicity of second SS / PBCH block. The wireless transmission I reception unit 10 may have a function to receive a PDSCH on physical resource block(s). The wireless transmission / reception unit 10 may have a function to monitor one of the first SS / PBCH block and the second SS / PBCH block. The wireless transmission I reception unit 10 may have a function to perform measurement for a transmitted SS / PBCH block. The wireless transmission / reception unit 10 may have a function to receive an indication indicating the transmitted SS / PBCH block.

[0112] 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.[0U3] 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.[0H4] 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, generatesa 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.

[0115] 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.

[0116] 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 receive a first parameter which indicates a first periodicity of first SS / PBCH block, and a second parameter which indicates a second periodicity of second SS / PBCH block. The higher- layer processing unit 14 may have a function to monitor one of the first SS / PBCH block and the second SS / PBCH block. The higher-layer processing unit 14 may have a function to determine the transmitted SS / PBCH block.

[0117] Hereinafter, physical signals (signals) will be described.

[0118] 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.

[0119] 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. Theuplink 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.

[0120] 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.

[0121] 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 ACKnowledgement).

[0122] 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.

[0123] 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 indicatethat 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).

[0124] 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.

[0125] HARQ-ACK status may indicate ACK or NACK which correspond to one CBG (Code Block Group) included in the transport block.

[0126] 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.

[0127] The channel state information may include at least part or all of a channel quality indicator (CQI), a precoder matrix indicator (PMI), and a rank indicator (RI). CQI is an indicator related to channel quality (e.g., propagation quality) or physical channelquality, and PMI is an indicator related to a precoder. RI is an indicator related to transmission rank (or the number of transmission layers).

[0128] 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.

[0129] 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.

[0130] 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.

[0131] A PRACH may be used to transmit a random-access preamble. The PRACH may be used to convey a random-access preamble. The sequence xu,v(n) of the PRACH is defined by xu, v (n) = xu(mod (n + Cv, LRA)). The Xu may be a ZC sequence (Zadoff-Chu sequence). The xumay be defined by xu= exp (-jpui (i + 1) / LRA). The j is an imaginary 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 the PRACH. 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.

[0132] 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.

[0133] 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), ULPTRS (UpLink Phase Tracking Reference Signal) may be used.

[0134] UL DMRS is a generic name of a DMRS for a PUSCH and a DMRS for a PUCCH.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] A downlink physical channel may correspond to a set of resource elements that carry information originating from the higher-layer and / or downlink controlinformation. 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 part or all of PBCH (Physical Broadcast Channel), PDCCH (Physical Downlink Control Channel), and PDSCH (Physical Downlink Shared Channel) may be used.

[0142] The downlink physical channels including PBCH and PDSCH may be used to provide system information (SI) to one or more terminal devices 1.

[0143] SI is divided into the MIB (Master Information Block) and a number of SIBs (System Information Block(s)).

[0144] The MIB is 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 SIB1 from the cell. The first transmission of the MIB is scheduled in subframes and repetitions are scheduled according to the period of SSB.

[0145] 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. SIB 1 repetition transmission period may be 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 SIBs are 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.

[0146] SIB1 may be provided on-demand. The terminal device 1 may perform SIB1 request if the SIB1 is not provided for corresponding SS / PBCH block (SSB). A channel / signal used to perform SIB1 request may be called as uplink wakeup signal (UL- WUS). The SIB1 request may be performed by 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).

[0147] 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. Each SI 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 Si-window and the Si-windows of different SI messages do not overlap. That is, within one Si-window only the corresponding SI message is transmitted. An SI message may be repeated with the same content a number of times within the Si-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.

[0148] The mapping of SIBs to SI messages is configured in higher layer parameter schedulinglnfoList and higher layer parameter schedulingInfoList2, while the mapping of posSIBs to SI messages is configured in higher layer parameter posSchedulinglnfoList and higher layer parameter schedulinglnfoList!. Each SIB and each posSIB is mapped to a single SI message.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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-ConfigSIBl which is an IE for pdcch-ConfigSIB 1 included in MIB.

[0153] The higher layer parameter MIB includes parameter systemFrameNumber , parameter subCarrierSpacingCommon, parameter ssb-SubcarrierOffset, parameter dmrs- TypeA-Po sition, parameter pdcch-ConfigSIB 1, parameter cellBarred, intraFreqReselection and spare bit.

[0154] 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).

[0155] subCarrierSpacingCommon 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 scs30orl20 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 and MsgB for initial access, paging and broadcast Si-messages is same as that for the corresponding SSB. For operation with shared spectrum channel access, this field instead is used for deriving the QCL relation between SS / PBCH blocks.

[0156] ssb-SubcarrierOffset corresponds to fc_SSB, which is the frequency domain offset between SSB and the overall resource block grid in number of subcarriers. The fc_SSB is determined based on the ssb-SubcarrierOffset in the acquired MIB. For operation with shared spectrum channel access in FR1, this field corresponds to / cSSB, and lc_SSB is obtained from kSSB. The 4 least significant bits of ZcSSBare given by the ssb-SubcarrierOffset and the most significant bit of / cSSBis given by the PBCH payload. If fcssB — 24, £_SSB = kSSB; otherwise, Q SSB = 2 |kSSB / 2] . The LSB of this field is 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 forSIB1 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 SIB 1 (or SS / PBCH block which is associated with SIB1).

[0157] dmrs-TypeA-Position indicates position of (first) DM-RS for downlink and uplink.

[0158] pdcch-ConfigSIBl determines a common ControlResourceSet (CORESET), a common search space and necessary PDCCH parameters. If the field ssb- SubcarrierOffset indicates that SIB 1 is absent, the field pdcch-ConfigSIBl indicates the frequency positions where the UE may find SS / PBCH block with SIB1, the frequency range 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).

[0159] cellBarred indicates if the cell is barred. Value barred means that the cell is barred.

[0160] intraFreqReselection controls cell selection / reselection to intra-frequency cells when the highest ranked cell is barred, or treated as barred by the UE.

[0161] The IE PDCCH-ConflgSIBl is used to configure CORESET&0 and search space#0. The PDCCH-ConfigSIBl includes parameter controlResourceSetZero and parameter searchSpaceZero.

[0162] 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 configured either via MIB or via dedicated RRC signalling. The CORESET 0 is a special type of CORESET which carries PDCCH / DCI for SIB 1.

[0163] searchSpaceZero may be used to determines a common search space with ID #0.

[0164] Physical layer control information includes 8 bits. The physical layer control information may include at least part or all of 0A to 0D. The 0A is radio frame information. The OB is half radio frame information (half system frame information). The 0C is SS / PBCH block index information. The 0D is subcarrier offset information.

[0165] 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.

[0166] 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.

[0167] 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 block index indicator may at least be used to identify an SS / PBCH block from index 0 to index63 (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.).

[0168] 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 and the first subcarrier in which the control resource set with index 0 is arranged.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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), DLDMRS (DownLink DeModulation Reference Signal), CSI-RS (Channel State Information-Reference Signal), and DL PTRS (DownLink Phase Tracking Reference Signal) may be used.

[0175] 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).

[0176] Figure 8 is a diagram showing a configuration example of an SS / PBCH block. In Figure 8, the horizontal axis indicates time domain (OFDM symbol index lsym), and thevertical 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).

[0177] 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 240th subcarriers of the 4th OFDM symbol, the PBCH is allocated to subcarriers in which the DMRS for the PBCH is not allocated.

[0178] The antenna ports of a PSS, an SSS, a PBCH, and a DMRS for the PBCH in an SS / PBCH block may be identical.

[0179] 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 conveyedcan 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.

[0180] DL DMRS is a generic name of DMRS for a PBCH, DMRS for a PDSCH, and DMRS for a PDCCH.

[0181] 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.

[0182] 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.

[0183] 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 same resource as the scheduled PDSCH, in the same slot, and in the same PRG (Precoding Resource Group).

[0184] 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.

[0185] 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 oneantenna 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).

[0186] A BCH (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.

[0187] 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.

[0188] ABCCH (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 to transmit 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.

[0189] 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: SystemInformation 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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 (PCI). 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.

[0197] A sequence of a PSS is given based at least on a physical cell ID (PCI). A sequence of an SSS is given based at least on the physical cell ID (PCI). PSS has 3 values 0,1 and 2 and created using m-sequence. SSS has 336 values 0 to 335 and generated using product of 2 m-sequences. PCI values will vary from 0 to 1007.

[0198] The PCI is used to distinguish cells on the radio. The PCIs of SS / PBCH blocks transmitted in different frequency locations do not have to be unique, i.e. different SS / PBCH blocks in the frequency domain can have different PCIs. However, when an SS / PBCH block is associated with an RMSI, the SS / PBCH block is referred to as a Cell- Defining SSB (CD-SSB). A PCell is always associated to a CD-SSB located on the synchronization raster.

[0199] When an SS / PBCH block is not associated with an RMSI, the SS / PBCH block is referred to as a non-Cell Defining SSB (NCD-SSB), which can be used to perform radio link monitoring (RLM), beam failure detection (BFD), and radio resource management (RRM) measurements and measurements for RA resource selection inside the active DL BWP when the active BWP does not contain the CD-SSB. The terminal device 1 may be configured with multiple SSBs provided that each BWP is configured with at most one SSB (CD-SSB or NCD-SSB).

[0200] 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 resource indicated 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.

[0201] 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.

[0202] 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 as follows, where index 0 corresponds to the first symbol of the first slot in a half-frame.

[0203] (Case A) - if the SCS of SS / PBCH blocks is 15 kHz, the first symbols of the candidate SS / PBCH blocks have indexes of {2,8}+14n.- For operation without shared spectrum channel access:- For carrier frequencies smaller than or equal to 3 GHz, n=0,l.- For carrier frequencies within FR1 larger than 3 GHz, n=0,l,2,3.- For operation with shared spectrum channel access, n=0,l,2,3,4.

[0204] (Case B) - if the SCS of SS / PBCH blocks is 30 kHz, the first symbols of the candidate SS / PBCH blocks have indexes {4,8,16,20}+28n. For carrier frequencies smaller than or equal to 3 GHz, n=0. For carrier frequencies within FR1 larger than 3 GHz, n=0,l .

[0205] (Case C) - if the SCS of SS / PBCH blocks is 30 kHz, the first symbols of the candidate SS / PBCH blocks have indexes {2,8}+14n.- For operation without shared spectrum channel access- For paired spectrum operation- For carrier frequencies smaller than or equal to 3 GHz, n=0,l. For carrier frequencies within FR1 larger than 3 GHz, n=0,l,2,3.- For unpaired spectrum operation- For carrier frequencies smaller than 1.88 GHz, n=0,l . For carrier frequencies within FR1 equal to or larger than 1.88 GHz, n=0,l,2,3.- For operation with shared spectrum channel access, n=0, 1,2, 3, 4, 5, 6, 7, 8, 9.

[0206] (Case D) - if the SCS of SS / PBCH blocks is 120 kHz, the first symbols of the candidate SS / PBCH blocks have indexes {4,8,16,20}+28n. For carrier frequencies within FR2, n=0, 1,2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.

[0207] (Case E) - if the SCS of SS / PBCH blocks is 240 kHz, the first symbols of the candidate SS / PBCH blocks have indexes {8,12,16,20,32,36,40,44}+56n. For carrier frequencies within FR2-1, n=0,l,2,3,5,6,7,8.

[0208] (Case F) - if the SCS of SS / PBCH blocks is 480 kHz SCS, the first symbols of the candidate SS / PBCH blocks have indexes {2,9}+14 n. For carrier frequencieswithin FR2-2, n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31.

[0209] (Case G) - if the SCS of SS / PBCH blocks is 960 kHz, the first symbols of the candidate SS / PBCH blocks have indexes {2,9}+14 • n. For carrier frequencies within FR2-2, n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31.

[0210] From the above cases, if the SCS of SS / PBCH blocks is not provided by RRC parameter {ssbSubcarrierSpacing), the applicable cases for a cell depend on a respective frequency band. A same case applies for all SS / PBCH blocks on the cell.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] Figure 9 is a diagram showing an example of SS / PBCH block transmission for 15 kHz SCS with carrier frequencies larger than 3 GHz. In this case, there are 8 SSB candidate positions in a half frame, and the half frame with SS / PBCH blocks is repeated every SSB periodicity (e.g. 20ms). The base station 3 transmits SS / PBCH blocks on one or more SSB candidate positions. The candidate positions where the base station 3 use for SSB transmission are indicated to the terminal device 1 by higher layer parameter (ssb-PositionsInBursf) . The ssb-PositionsInBurst indicates the time domain positions of the transmitted SS-blocks in a half frame with SS / PBCH blocks as bitmap. The first / leftmost bit corresponds to SS / PBCH block index 0 (SSB candidate position 1 in Figure 9), the second bit corresponds to SS / PBCH block index 1 (SSB candidate position 2 in Figure 9), and so on. Value 0 in the bitmap indicates that the corresponding SS / PBCH block is not transmitted while value 1 indicates that the corresponding SS / PBCH block is transmitted. The periodicity where the base station 3 use for SSB transmission are indicated to the terminal device 1 by higher layer parameter (ssb-PeriodicityServingCell). The ssb-PeriodicityServingCell indicates the SSB periodicity in ms for the rate matching purpose. If the field for ssb-PeriodicityServingCell is absent, the terminal device 1 applies the value 5ms.

[0216] For initial cell selection, the terminal device 1 may assume that half frames with SS / PBCH blocks occur with a periodicity of 2 frames.

[0217] 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 SIB 1 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.

[0218] The random-access is a procedure including at least a part or all of message 1, message 2, message 3, and message 4.

[0219] 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) in one 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.

[0220] 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.

[0221] For paired spectrum (i.e. FDD), or supplementary uplink band, all ROs are assumed to be valid RO.

[0222] 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 / Vgapsymbols after a last SS / PBCH block reception symbol, where 7Vgapis predetermined; (2) if a UE is provided the tdd-UL-DL-ConflgurationCommon, 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 A / gapsymbols after a last downlink symbol and at least Agapsymbols after a last SS / PBCH block symbol.

[0223] 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 may attempt to detect the DCI format l_0 in a search-space-set while the RAR window is running.

[0224] The message 3 (Msg3, Msg 3) is a procedure (or transmitted 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. Therandom-access response grant is indicated by the MAC CE included in the PDSCH scheduled by the DCI format l_0.

[0225] 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.

[0226] 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).

[0227] The message 4 (Msg4, Msg 4) is a procedure (or transmitted signal / channel itself for the procedure) that attempts to detect a DCI format l_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.

[0228] Data communication is a generic term for downlink communication and uplink communication.

[0229] In data communication, the terminal device 1 attempts to detect a PDCCH (attempts 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 called as “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 1attempts to detect a DCI format in a search-space-set”. Monitoring a PDCCH may be equivalent as monitoring a DCI format in the PDCCH.

[0230] 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.

[0231] 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.

[0232] A PDCCH may be also called as a PDCCH candidate.

[0233] A search-space-set is defined as a set of PDCCFI candidates. A search-space- set may be a Common Search Space (CSS) set or a UE-specific Search Space (USS) set.

[0234] The CSS set is a generic name of a type-0 PDCCH CSS set, a type-Oa PDCCHCSS 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.

[0235] 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 Spacethat 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 SIB 1.

[0236] 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.

[0237] 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.

[0238] 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.

[0239] Figure 10 is a diagram showing an example of the monitoring occasion of the search-space-set. In Figure 10, the search-space-set 91 and the search-space-set 92 are sets in 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.

[0240] In Figure 10, 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.

[0241] In Figure 10, 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.

[0242] In Figure 10, 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.

[0243] In Figure 10, 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.

[0244] In Figure 10, 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.

[0245] 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).

[0246] 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.

[0247] 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.

[0248] 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).

[0249] 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 ofmsg3 (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.

[0250] 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).

[0251] 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.

[0252] 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).

[0253] 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 assigns different 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] PUSCH transmission(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 layer parameter configuredGrantConfig not including rrc-ConflguredUplinkGrant. 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.

[0258] To suppress the energy consumption for SS / PBCH block (SSB) transmission on the base station 3, the base station 3 may perform adaptation of SSB transmission.

[0259] For the adaptation of SSB transmission, the base station 3 may change / switch / reconfigure the periodicity of SSB transmission. Figure 11 is a diagram showing an example of adaptation of SSB periodicity. In Figure 11, the base station 3 transmits SS / PBCH blocks with a first periodicity (40ms), firstly. After changing SSB periodicity, the base station 3 transmits SS / PBCH blocks with a second periodicity (20ms). In this way, by changing the periodicity within the same cell, SS / PBCH block can be transmitted as frequently as necessary. For example, if there is no terminal device 1 within a cell, the base station 3 use long periodicity for SS / PBCH block transmission to save its transmission power. Then, when the traffic in the cell increase with the number of terminal device 1, the base station 3 use short periodicity to support synchronization and measurement in the terminal device 1 side.

[0260] The base station 3 may transmit a first parameter (ssb- periodicityServingCel.il} which indicates a first periodicity of first SS / PBCH block and a second parameter (ssb-periodicityServingCell2} which indicates a second periodicity of second SS / PBCH block. The first periodicity and the second periodicity may be configured for a same PCI. The first periodicity and the second periodicity may be configured for a same TCI (same TCI state). The terminal device 1 may receive the ssb- periodicityServingCelll and the ssb-periodicityServingCell2 as higher layer parameter. The terminal device 1 may monitor one of the SS / PBCH block based on ssb- periodicityServingCelll and the SS / PBCH block based on the ssb- periodicityServingCell2. The terminal device 1 may also receive an indication indicating which of the ssb-periodicityServingCelll and the ssb-periodicityServingCell2 is applied for the SS / PBCH transmission. The indication may be included in a DCI format transmitted on PDCCH. The indication may be 1 bit which indicates one of the ssb-periodicityServingCelll and the ssb-periodicityServingCell2. The indication may be multiple bits which indicates one of the candidate SSB periodicity values. The candidate SSB periodicity values may include 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, 320ms, 640ms and 1280ms. The indication may be transmitted as higher layer parameter. Alternatively, the terminal device 1 may determine / change / switch the SSB periodicity based on a rule without receiving the indication. The terminal device 1 may transmit a request signal to request to change / switch / reconfigure the SSB periodicity to the base station 3. The base station 3 may change / switch / reconfigure the SSB periodicity upon the reception of the request signal.

[0261] The base station 3 may transmit a first parameter (ssb- periodicityServingCelll') which indicates a first SSB periodicity of first SS / PBCH block and may transmit aperiodicity indication indicating second SSB periodicity. The terminal device 1 applying the first SSB periodicity of SS / PBCH block may change / switch / reconfigure the SSB periodicity to the second SSB periodicity upon reception of the periodicity indication. The periodicity indication may be included in a DCI format transmitted on PDCCH. The periodicity indication may be transmitted as higher layer parameter.

[0262] The terminal device 1 may perform reception of PDSCH considering the SSB periodicity.

[0263] The terminal device 1 may perform measurement for the cell considering the SSB periodicity.

[0264] For the adaptation of SSB transmission, the base station 3 may change / switch / reconfigure a set of actual SSB transmissions in a half radio frame (e.g. SS -burst-set). Figure 12 is a diagram showing an example of adaptation of actual SSBtransmissions in a half frame. In Figure 12, the base station 3 transmits SS / PBCH blocks with ssb-PositionsInBurstl (11101100), firstly. After changing actual SSB transmissions in a half frame, the base station 3 transmits SS / PBCH blocks with ssb-PositionsInBurst2 (11000000). In this way, by changing the number of transmitted SSBs (can be number of DL Tx beams) within a half frame, SS / PBCH block can be transmitted as necessary.

[0265] The base station 3 may transmit a third parameter (ssb-PositionsInBurstl} which indicates a first time domain positions of first SS / PBCH block in a half frame with the first SS / PBCH block and a second parameter (ssb-PositionsInBurst2) which indicates a second time domain positions of second SS / PBCH block in a half frame with the second SS / PBCH block. The first time domain positions and the second time domain positions may be configured for a same PCI. The first time domain positions and the second time domain positions may be configured for a same TCI (same TCI state). The terminal device 1 may receive the ssb-PositionsInBurstl and the ssb-Positions!nBurst2 as higher layer parameter. The terminal device 1 may also receive an indication indicating which of the ssb-PositionsInBurstl and the ssb-Positions!nBurst2 is applied for the SS / PBCH transmission. The indication may be included in a DCI format transmitted on PDCCH. The indication may be transmitted as higher layer parameter. Alternatively, the terminal device 1 may determine / change / switch the actual SSB transmissions in a half radio frame based on a predetermined rule. The terminal device 1 may transmit a request signal to request to change / switch / reconfigure the actual SSB transmissions in a half radio frame to the base station 3. The base station 3 may change / switch / reconfigure the actual SSB transmissions in a half radio frame upon the reception of the request signal.

[0266] The terminal device 1 may perform reception of PDSCH considering the time domain positions of SS / PBCH block in a half frame.

[0267] The terminal device 1 may perform measurement for the cell considering the time domain positions of SS / PBCH block in a half frame.

[0268] For the adaptation of SSB transmission, the base station 3 may change / switch / reconfigure both of SSB periodicity and a set of actual SSB transmissions in a half radio frame as mentioned above.

[0269] The terminal device 1 may transmit a signal / channel which can be called as SSB modification request (or can be called as uplink wake up signal (UL-WUS)) to require the base station 3 to change / switch / reconfigure the SSB transmission. If the base station 3 receives the SSB modification request transmitted by the terminal device 1, the base station 3 may change / switch / reconfigure the SSB transmission.

[0270] In the SSB modification request procedure, the terminal device 1 transmit SSB modification request signal. The SSB modification request signal may be referred as uplink wake up signal (UL-WUS). The SSB modification request signal may be a preamble. The SSB modification request signal may be a preamble for the SSB modification request. The SSB modification request signal may be the random access preamble. The triggering of the SSB modification request procedure may be the triggering of the random access procedure.

[0271] After transmitting the SSB modification request signal, the terminal device 1 may monitor an acknowledgement for the SSB modification request signal. The acknowledgement for the SSB modification request signal may be Msg2 (or random access response). If the acknowledgement for SSB modification request signal is received, the terminal device 1 may apply the SSB modification for the SSB reception.

[0272] The SSB modification request signal may be transmitted as a preamble (SSB modification request preamble). The SSB modification request preambles may be a kindof Gold sequence. The SSB modification request preambles may be a kind of Zadoff-Chu sequence. The set of SSB modification request preambles x_{u,v}(n) may be generated according to x_{u,v}(ri) = x_u (tn + C_v) mod Z_{seq}) x u (z) = eA{- / *pi*w*z7(z+l) / Z_{seq}}, z = 0, 1, Z_{seq}-1 where L_{seq} is the length of sequence used for the SSB modification request signal, u is an index of root sequence and C _v is a value of cyclic shift to generate different SSB modification request preambles. The Z_{seq] for the SSB modification request preambles may be predefined or may be configured by a signalling (e.g. MIB or SIBO). The Z_{seq} may be 839 or 139. The u for the SSB modification request preambles may be predefined or may be configured by a signalling (e.g. MIB or SIBO). The C_v for the SSB modification request preambles may be predefined or may be configured by a signalling (e.g. MIB or SIBO).

[0273] There may be 64 SSB modification request preambles defined in each resource for SSB modification request signal, enumerated in increasing order of first increasing cyclic shift C_v of a logical root sequence, and then in increasing order of the logical root sequence index.

[0274] The SSB modification request signal is transmitted using configuration of the SSB modification request signal.

[0275] The configuration of the SSB modification request signal may include time location information of the resource for SSB modification request signal (e.g. resource for a preamble), frequency location information of the resource for SSB modification request signal, subcarrier spacing information for the SSB modification request signal (e.g. subcarrier spacing information for a preamble), preamble index information for theSSB modification request signal (e.g. for a preamble) and / or root sequence information for the SSB modification request signal (e.g. for a preamble).

[0276] A part of the configuration of the SSB modification request signal may be predetermined. For example, the SSB modification request signal may be transmitted on predetermined time / frequency resource. For example, the resource for the SSB modification request signal may be a fixed time / frequency location corresponding to the resource of SS / PBCH block with PBCH for the acquired MIB.

[0277] When the terminal device 1 detects PDSCH scheduled by PDCCH, the terminal device may determine the frequency resources and the time resources for the PDSCH based on the scheduling information in a DCI transmitted on PDCCH.

[0278] When the terminal device 1 is scheduled to receive PDSCH by a DCI, the Time domain resource assignment field value m for the scheduled PDSCH on the serving cell provides a row index m + 1 to a resource allocation table. The indexed row defines the slot offset KO, the start and length indicator SLIV, or directly the start symbol S and the allocation length L, and the PDSCH mapping type to be assumed in the PDSCH reception.

[0279] The terminal device 1 determines PDSCH resource mapping for its detection considering SS / PBCH block transmission.

[0280] When receiving the PDSCH scheduled with SI-RNTI and the system information indicator in DCI is set to 0, the terminal device 1 assumes that no SS / PBCH block is transmitted in resource elements (REs) used by the terminal device 1 for a reception of the PDSCH.

[0281] When receiving the PDSCH scheduled with SI-RNTI and the system information indicator in DCI is set to 1, RA-RNTI, MSGB-RNTI, P-RNTI or TC-RNTI,and when only one parameter which indicates a set of actual SSB transmissions in a half radio frame (ssb-PositionsInBurst) is configured, the terminal device 1 assumes SS / PBCH block transmission according to ssb-PositionsInBurst. When only one parameter which indicates a set of actual SSB transmissions in a half radio frame (ssb- PositionslnBursf) is configured and if the PDSCH resource allocation overlaps with physical resource blocks (PRBs) containing SS / PBCH block transmission resources, the terminal device 1 may assume that the PRBs containing SS / PBCH block transmission resources are not available for PDSCH in the OFDM symbols where SS / PBCH block is transmitted.

[0282] When receiving the PDSCH scheduled with SI-RNTI and the system information indicator in DCI is set to 1, RA-RNTI, MSGB-RNTI, P-RNTI or TC-RNTI, and when multiple sets of actual SSB transmissions in a half radio frame (e.g. ssb- PositionsInBurstl and ssb-Positions!nBurst2)' are configured, the terminal device 1 assumes SS / PBCH block transmission according to one of the multiple sets. When multiple sets of actual SSB transmissions in a half radio frame (e.g. ssb-PositionsInBurst 1 and ssb-Positions!nBurst2)' are configured and if the PDSCH resource allocation overlaps with physical resource blocks (PRBs) containing SS / PBCH block transmission resources, the terminal device 1 may assume that the PRBs containing SS / PBCH block transmission resources are not available for PDSCH in the OFDM symbols for one of the multiple sets of actual SSB transmissions. The OFDM symbols for one of the multiple sets of actual SSB transmissions may be the OFDM symbols for SS / PBCH block transmission with ssb-PositionsInBurstl . The OFDM symbols for one of the multiple sets of actual SSB transmissions may be the OFDM symbols for SS / PBCH block transmission with ssb- PositionsInBurst2. The OFDM symbols for one of the multiple sets of actual SSBtransmissions may be the OFDM symbols for SS / PBCH block transmission with indicated one of the multiple sets. The OFDM symbols for one of the multiple sets of actual SSB transmissions may be the OFDM symbols for SS / PBCH block transmission with ssb-PositionsInBurst (i.e. not configured one for the multiple sets but configured one for a single set). The OFDM symbols for one of the multiple sets of actual SSB transmissions may be the OFDM symbols for SS / PBCH block transmission with one which is with the largest number of SS / PBCH blocks within a half frame among the multiple sets.

[0283] When receiving the PDSCH scheduled with SI-RNTI and the system information indicator in DCI is set to 1, RA-RNTI, MSGB-RNTI, P-RNTI or TC-RNTI, and when multiple SSB periodicity values (e.g, ssb-periodicityServingCelll and ssb- periodicityServingCell2) are configured, the terminal device 1 assumes SS / PBCH block transmission according to one of the multiple SSB periodicity values. When multiple SSB periodicity values (e.g. ssb-periodicityServingCelll and ssb-periodicityServingCell2) are configured and if the PDSCH resource allocation overlaps with physical resource blocks (PRBs) containing SS / PBCH block transmission resources, the terminal device 1 may assume that the PRBs containing SS / PBCH block transmission resources are not available for PDSCH in the OFDM symbols for one of the multiple periodicity values. The OFDM symbols for one of the multiple periodicity values may be the OFDM symbols for SS / PBCH block transmission with the SSB periodicity configured by ssb- periodicityServingCelll . The OFDM symbols for one of the multiple periodicity values may be the OFDM symbols for SS / PBCH block transmission with the SSB periodicity configured by ssb-periodicityServingCell2. The OFDM symbols for one of the multiple periodicity values may be the OFDM symbols for SS / PBCH block transmission withindicated one of the multiple periodicity values. The OFDM symbols for one of the multiple periodicity values may be the OFDM symbols for SS / PBCH block transmission with ssb-periodicityServingCell (i.e. not configured one for the multiple periodicity values but configured one for a single periodicity value). The OFDM symbols for one of the multiple periodicity values may be the OFDM symbols for SS / PBCH block transmission with one which is with the shortest periodicity value among the multiple periodicity values.

[0284] When the terminal device 1 assumes that the PRBs containing SS / PBCH block transmission resources are not available for PDSCH in the OFDM symbols, the terminal device 1 performs rate matching for the received PDSCH with the PRBs except for the PRBs which are not available for the PDSCH. In other words, the terminal device 1 may attempt the detection of PDSCH without the PRBs which are not available.

[0285] The terminal device 1 may expect a configuration provided by ssb- Positions InBurst in ServingCellConfigCommon to be same as a configuration provided by ssb-PositionsInBurst in SIB1.

[0286] When receiving PDSCH scheduled by PDCCH with CRC scrambled by C- RNTI, MCS-C-RNTI, CS-RNTI, G-RNTI, G-CS-RNTI, MCCH-RNTI, multicast- MCCH-RNTI or PDSCHs with SPS, the REs corresponding to the configured or dynamically indicated resources are not available for PDSCH. The terminal device 1 may assume SS / PBCH block transmission according to ssb-PositionsInBurst if the PDSCH resource allocation overlaps with PRBs containing SS / PBCH block transmission resources. The terminal device 1 may assume that the PRBs containing SS / PBCH block transmission resources are not available for PDSCH in the OFDM symbols where SS / PBCH block associated with the same physical cell ID (PCI) is transmitted.

[0287] For operation with shared spectrum channel access, SS / PBCH block transmission according to ssb-PositionsInBurst represents all of the candidate SS / PBCH blocks corresponding to SS / PBCH block indices provided by ssb-PositionsInBurst .

[0288] In case that the base station 3 configures a first parameter which indicates a first periodicity of first SS / PBCH block (e.g. ssb-periodicityServingCelll') and a second parameter which indicates a second periodicity of second SS / PBCH block (e.g. ssb- periodicityServingCell2) for a cell (with a PCI), the terminal device 1 may assume that a physical resource block containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block.

[0289] The first periodicity of first SS / PBCH block configured by the first parameter may be always shorter than the second periodicity of the second SS / PBCH block configured by the second parameter.

[0290] The first parameter for the first periodicity of first SS / PBCH block and the second parameter for the second periodicity of second SS / PBCH block are associated with same cell and / or same PCI.

[0291] The first parameter for the first periodicity of first SS / PBCH block and the second parameter for the second periodicity of second SS / PBCH block are associated with same transmission configuration indicator (TCI) (can be same TCI state).

[0292] TCI state is used to establish the Quasi co-location (QCL) connection between the target reference signal (RS) and the source RS. Two antenna ports are quasi co-located if 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. TCI states are configured for PDCCH or a PDSCH in order to convey the QCL indication for the respective RS.

[0293] TCI state change and corresponding beam switch could be initiated via MAC CE or DCI. When TCI for PDSCH is indicated by DCI, the TCI state or beam switch can be configured via DCI. DCI based TCI state switch is applicable to PDSCH. When PDSCH follows the TCI state of PDCCH, for a beam switch the TCI state of PDCCH must first be initiated via MAC CE. Hence, for PDCCH MAC CE based TCI state switch would be applicable.

[0294] For inter-cell multi-TRP operation, for multi-DCI PDSCH transmission, one or more TCI states can be associated with SSB with a PCI different from the serving cell PCI. The activated TCI states can be associated with at most one PCI different from the serving cell PCI at a time.

[0295] For the first SS / PBCH block and for the second SS / PBCH block, same parameter can be applied. For example, for the first SS / PBCH block and for the second SS / PBCH block, same ssb-PositionsInBurst may be applied.

[0296] The terminal device 1 may perform measurement of a cell by measuring received power of SS / PBCH block. SS reference signal received power (SS-RSRP) is defined as the linear average over the power contributions (in [W]) of the resource elements that carry SSS of the SS / PBCH block. The measurement time resource(s) for SS-RSRP are confined within SS / PBCH Block Measurement Time Configuration (SMTC) window duration. If SS-RSRP is used for Ll-RSRP as configured by reporting configurations, the measurement time resources(s) restriction by SMTC window duration is not applicable. The SS-RSRP shall be measured only among the reference signals corresponding to SS / PBCH blocks with the same SS / PBCH block index and the same PCI.

[0297] Measurements to be performed by the terminal device 1 for connected mode mobility are classified in at least four measurement types:- Intra- frequency NR measurements;- Inter-frequency NR measurements;- Inter-RAT measurements for E-UTRA;- Inter-RAT measurements for UTRA.

[0298] For each measurement type one or several measurement objects can be defined (a measurement object defines e.g. the carrier frequency to be monitored).

[0299] For each measurement object one or several reporting configurations can be defined (a reporting configuration defines the reporting criteria). Three reporting criteria are used: event triggered reporting, periodic reporting and event triggered periodic reporting.

[0300] The association between a measurement object and a reporting configuration is created by a measurement identity (a measurement identity links together one measurement object and one reporting configuration of the same RAT). By using several measurement identities (one for each measurement object, reporting configuration pair) it is then possible to:- Associate several reporting configurations to one measurement object and;- Associate one reporting configuration to several measurement objects.

[0301] The measurements identity is used as well when reporting results of the measurements.

[0302] Measurement quantities are considered separately for each RAT.

[0303] Measurement commands are used by NG-RAN to order the terminal device 1 to start, modify or stop measurements.

[0304] In RRC CONNECTTsD. the terminal device 1 measures multiple beams (at least one) of a cell and the measurements results (power values) are averaged to derive the cell quality. In doing so, the terminal device 1 is configured to consider a subset of the detected beams. Filtering takes place at two different levels: at the physical layer to derive beam quality and then at RRC level to derive cell quality from multiple beams. Cell quality from beam measurements is derived in the same way for the serving cell(s) and for the non-serving cell(s). Measurement reports may contain the measurement results of the X best beams if the terminal device 1 is configured to do so by the base station 3.

[0305] Measurement reports are characterized by the following:- Measurement reports include the measurement identity of the associated measurement configuration that triggered the reporting;- Cell and beam measurement quantities to be included in measurement reports are configured by the network;- The number of non-serving cells to be reported can be limited through configuration by the network;- Cells belonging to an exclude-list configured by the network are not used in event evaluation and reporting, and conversely when an allow-list is configured by the network, only the cells belonging to the allow-list are used in event evaluation and reporting;- Beam measurements to be included in measurement reports are configured by the network (beam identifier only, measurement result and beam identifier, or no beam reporting).

[0306] SSB based intra-frequency measurement: a measurement is defined as an SS / PBCH block based intra-frequency measurement provided the center frequency of theSS / PBCH block of the serving cell and the center frequency of the SS / PBCH block of the neighbour cell are the same, and the subcarrier spacing of the two SS / PBCH blocks is also the same.

[0307] SSB based inter-frequency measurement: a measurement is defined as an SS / PBCH block based inter-frequency measurement provided the center frequency of the SS / PBCH block of the serving cell and the center frequency of the SS / PBCH block of the neighbour cell are different, or the subcarrier spacing of the two SS / PBCH block is different.

[0308] For SSB based measurements, one measurement object corresponds to one SSB and the terminal device 1 considers different SS / PBCH blocks as different cells.

[0309] If the terminal device 1 is configured to perform serving cell measurements based on an NCD-SSB configured in its active BWP, this NCD-SSB is considered as the SS / PBCH block of the serving cell in the definition of intra-frequency and inter-frequency measurements as above.

[0310] When only one parameter which indicates a set of actual SSB transmissions in a half radio frame (ssb-PositionsInBurst) is configured, the terminal device 1 may perform a measurement of SS / PBCH block according to ssb-PositionsInBurst.

[0311] When multiple sets of actual SSB transmissions in a half radio frame (e.g. ssb- PositionsInBurstl and ssb-PositionsInBurst2} are configured, the terminal device 1 may perform a measurement of SS / PBCH block according to one of the multiple sets. The measurement may be performed using SS / PBCH block transmission with ssb- PositionsInBurstl . The measurement may be performed using SS / PBCH block transmission with Ssb-PositionsInBurst2. The measurement may be performed using SS / PBCH block transmission with indicated one of the multiple sets. The measurementmay be performed using SS / PBCH block transmission with ssb-PositionslnBurst (i.e. not configured one for the multiple sets but configured one for a single set). The measurement may be performed using SS / PBCH block transmission with one which is the largest number of SS / PBCH blocks within a half frame among the multiple sets.

[0312] When multiple SSB periodicity values (e.g. ssb-periodicityServingCelll and ssb-periodicityServingCell2) are configured, the terminal device 1 may perform a measurement of SS / PBCH block according to one of the multiple SSB periodicity values. The multiple SSB periodicity values may be configured for the measurement. The multiple SSB periodicity values may be separately configured with multiple SSB periodicity values for the rate matching purpose. The measurement may be performed using SS / PBCH block transmission with the SSB periodicity configured by ssb- periodicityServingCelll . The measurement may be performed using SS / PBCH block transmission with the SSB periodicity configured by ssb-periodicityServingCell2. The measurement may be performed using SS / PBCH block transmission with indicated one of the multiple periodicity values. The measurement may be performed using SS / PBCH block transmission with ssb-periodicityServingCell (i.e. not configured one for the multiple periodicity values but configured one for a single periodicity value). The measurement may be performed using SS / PBCH block transmission with one which is with the shortest periodicity value among the multiple periodicity values.

[0313] Figure 13 shows an example of a method for a terminal device 1. The method comprise receiving a first parameter (can be ssb-periodicityServingCelll') which indicates a first periodicity of first SS / PBCH block and a second parameter (can be ssb- periodicityServingCellZ) which indicates a second periodicity of second SS / PBCH block (Step 1001). The method comprise receiving a PDSCH on physical resource block(s)(PRB(s)) (Step 1002). The terminal device 1 may assume that a physical resource block (PRB) containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block. The terminal device 1 may monitor one of the first SS / PBCH block and the second SS / PBCH block. The first periodicity may be shorter than the second periodicity. The first parameter and the second parameter may be associated with a same PCI. The first parameter and the second parameter may be associated with a same TCI. A same parameter {ssb-PositionsInBursf) may apply to the first SS / PBCH block and the second SS / PBCH block.

[0314] Figure 14 shows an example of a method for a BS 3. The method comprise transmitting a first parameter (can be ssb-periodicityServingCelll} which indicates a first periodicity of first SS / PBCH block and a second parameter (can be ssb- periodicityServingCell2} which indicates a second periodicity of second SS / PBCH block (Step 2001). The method comprise transmitting a PDSCH on physical resource block(s) (PRB(s)). The base station 3 may assume that a physical resource block (PRB) containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block. The first periodicity may be shorter than the second periodicity. The first parameter and the second parameter may be associated with a same PCI. The first parameter and the second parameter may be associated with a same TCI. A same parameter (ssb-PositionsInBursf) may apply to the first SS / PBCH block and the second SS / PBCH block.

[0315] Figure 15 shows another example of a method for a terminal device 1. The method comprise receiving a first parameter (can be ssb-periodicityServingCelll} which indicates a first periodicity of first SS / PBCH block and a second parameter (can be ssb~ periodicityServingCell2') which indicates a second periodicity of second SS / PBCH block(Step 1001). The method comprise receiving a PDSCH on physical resource block(s) (PRB(s)) (Step 1002). The terminal device 1 may assume that a physical resource block (PRB) containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block. The terminal device 1 may monitor one of the first SS / PBCH block and the second SS / PBCH block. The first periodicity may be shorter than the second periodicity. The first parameter and the second parameter may be associated with a same PCI. The first parameter and the second parameter may be associated with a same TCI. A same parameter (ssb-PositionsInBurst) may apply to the first SS / PBCH block and the second SS / PBCH block.

[0316] Figure 16 shows another example of a method for a BS 3. The method comprise transmitting a first parameter (can be ssb-periodicityServingCelll) which indicates a first periodicity of first SS / PBCH block and a second parameter (can be ssb- periodicityServingCell2) which indicates a second periodicity of second SS / PBCH block (Step 2001). The method comprise transmitting a PDSCH on physical resource block(s) (PRB(s)). The base station 3 may assume that a physical resource block (PRB) containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block. The first periodicity may be shorter than the second periodicity. The first parameter and the second parameter may be associated with a same PCI. The first parameter and the second parameter may be associated with a same TCI. A same parameter (ssb-PositionsInBurst') may apply to the first SS / PBCH block and the second SS / PBCH block.

[0317] 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 amanner 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.

[0318] 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.

[0319] 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 flexible disk, 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.

[0320] 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 beconfigured to be capable of realizing the functions described above in combination with a program already recorded in the computer system.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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, and embodiments 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 receive a first parameter which indicates a first periodicity of first SS / PBCH block, and configured to receive a second parameter which indicates a second periodicity of second SS / PBCH block; and reception circuitry configured to receive a PDSCH on physical resource block(s), wherein the UE assumes that a physical resource block containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block.

2. The UE according to the claim 1 : wherein the processing circuitry is configured to monitor one of the first SS / PBCH block and the second SS / PBCH block.

3. The UE according to the claim 1 : wherein the first periodicity is shorter than the second periodicity.

4. The UE according to the claim 1 : wherein the first parameter and the second parameter are associated with a same PCI.

5. The UE according to the claim 1 : wherein the first parameter and the second parameter are associated with a same TCI.

6. The UE according to the claim 1 : wherein a same parameter applies to the first SS / PBCH block and the second SS / PBCH block.

7. A base station, comprising: processing circuitry configured to transmit a first parameter which indicates a first periodicity of first SS / PBCH block, configured to transmit a second parameter which indicates a second periodicity of second SS / PBCH block, and transmission circuitry configured to transmit a PDSCH on physical resource block(s), wherein the base station assumes that a physical resource block containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block.

8. The base station according to the claim 7: wherein the first periodicity is shorter than the second periodicity.

9. The base station according to the claim 7: wherein the first parameter and the second parameter are associated with a same PCI.

0. A method performed by a user equipment (UE), the method comprising: receiving a first parameter which indicates a first periodicity of first SS / PBCH block, receiving a second parameter which indicates a second periodicity of secondSS / PBCH block, and receiving a PDSCH on physical resource block(s), wherein the UE assumes that a physical resource block containing resources for the first SS / PBCH block is not available for the PDSCH in OFDM symbol(s) which is for the first SS / PBCH block.

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