User equipment, base station and method

Abstract

A user equipment (UE) is described. The UE may include receiving circuitry configured to receive system information including RACH configuration information, where the RACH configuration information includes a set of parameters including parameters specifying the number of PRACH repetitions; and a control circuit configured to apply the set of parameters when performing the random access.

Description

Technical Field

[0001] The present invention relates to 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 (hereinafter referred to as Long Term Evolution or Evolved Universal Terrestrial Radio Access) for cellular mobile communications have been studied. In LTE (Long Term Evolution), a base station device is also referred to as an evolved node B (eNode B), 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, wherein each of the multiple areas is covered by a base station device. A single base station device can manage multiple cells. Evolved Universal Terrestrial Radio Access is also referred to as E-UTRA.

[0003] In 3GPP, the next generation standard (New Radio: NR) has been studied in order to propose to the International Mobile Telecommunications 2020 (IMT-2020), the standard for the next generation mobile communication system defined by the International Telecommunication Union (ITU). NR is expected to meet the requirements of three scenarios, namely enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low latency communication (URLLC), in a single technology framework.

[0004] For 5G user equipment (UE), initial random access plays an important role in meeting the latency requirement. However, for some cell-edge UEs, latency may occur due to poor connectivity during the random access process. To extend the coverage of 5G services, techniques for UEs with enhanced coverage are studied. For UEs with enhanced coverage, the physical random access channel (PRACH) resources should be carefully designed for UEs with different path loss values. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 is a conceptual diagram of a wireless communication system; Figure 2 is a graph showing the subcarrier spacing configuration u, the number of OFDM symbols per time slot N slot symb An example of the relationship with the CP configuration; Figure 3 is a diagram showing an example of a method of configuring a resource grid; Figure 4 is a diagram showing a configuration example of a resource grid 3001; Figure 5 is a schematic block diagram showing a configuration example of a base station device; Figure 6 is a schematic block diagram showing a configuration example of a terminal device; Figure 7 is a diagram showing a configuration example of an SS / PBCH block; Figure 8 is a diagram showing an example of monitoring opportunities for a search space set; Fig. 9 is a diagram showing an example of a random access procedure according to an embodiment of the present invention; Fig.10 is a diagram showing an example of allocation of SSB indexes to PRACH opportunities according to the present embodiment; Fig.11 is a diagram showing an example of PRACH repetition using multiple PRACH opportunities; Fig.12 is an example of a higher layer parameter for identifying a set of PRACH preambles and PRACH opportunities that may be used for PRACH repetitions; Fig.13 is an example of a high-level parameter that associates a set of preambles with a feature combination; Fig.14 An example of a method for a terminal device 1 is shown; Fig.15 An example of a method for base station device 3 is shown. DETAILED DESCRIPTION

[0006] The present invention describes a user equipment (UE). The UE may include a transmitting circuit configured as a receiving circuit configured to receive system information including random access channel (RACH) configuration information, wherein the RACH configuration information includes a parameter set specifying a preamble partition associated with a physical random access channel (PRACH) with repetitions and a RACH opportunity, wherein the parameter set includes a first parameter specifying a starting preamble of the preamble partition, a second parameter specifying how many consecutive preambles are associated with the preamble partition, and a third parameter specifying the number of PRACH repetitions, and a control circuit configured to apply the parameter set when performing random access.

[0007] The present invention describes a base station. The base station includes a control circuit configured to set RACH configuration information including a parameter set specifying a preamble partition and a random access channel (RACH) opportunity associated with a physical random access channel (PRACH) with repetition as system information, wherein the parameter set includes a first parameter specifying a starting preamble of the preamble partition, a second parameter specifying how many consecutive preambles are associated with the preamble partition, and a third parameter specifying the number of PRACH repetitions, and a transmitting circuit configured to transmit the system information to a terminal device.

[0008] The present invention describes a method for a base station. The method may include setting random access channel (RACK) configuration information including a parameter set specifying a preamble partition and a RACH opportunity associated with a physical random access channel (PRACH) with repetition as system information, wherein the parameter set includes a first parameter specifying a first preamble associated with the preamble partition, a second parameter specifying how many consecutive preambles are associated with the preamble partition, and a third parameter specifying the number of PRACH repetitions, and transmitting the system information to a terminal device.

[0009] floor(CX) may be a floor function of a real number CX. For example, floor(CX) may be a function that provides a maximum integer within a range not exceeding the real number CX. ceil(DX) may be a ceiling function of a real number DX. For example, ceil(DX) may be a function that provides a minimum integer within a range not less than the real number DX. mod(EX,FX) may be a function that provides a remainder obtained by dividing EX by FX. mod(EX,Fx) may be a function that provides a value corresponding to the remainder of dividing EX by FX. It is exp(GX)=e^GX. Here, e is Napier's constant. (HX)^(IX) indicates that IX is a power of HX.

[0010] In a wireless communication system according to one aspect of the present embodiment, at least OFDM (Orthogonal Frequency Division Multiplexing) is used. OFDM symbol is the time domain unit of OFDM. OFDM symbol includes at least one or more subcarriers. OFDM symbol is converted into a time-continuous signal in baseband signal generation. In the downlink, at least CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing) is used. In the uplink, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing) is used. DFT-s-OFDM can be given by applying transform precoding to CP-OFDM. CP-OFDM is OFDM using CP (Cyclic Prefix).

[0011] The OFDM symbol may be a name including the CP added to the OFDM symbol. That is, the OFDM symbol may be configured to include the OFDM symbol and the CP added to the OFDM symbol.

[0012] Figure 1 is a conceptual diagram of a wireless communication system. Figure 1 In the wireless communication system, at least terminal devices 1A to 1C and a base station device 3 (BS#3: Base Station #3) are included. Hereinafter, the terminal devices 1A to 1C are also referred to as terminal device 1 (UE#1: User Equipment #1).

[0013] The base station device 3 may be configured to include one or more transmitting devices (or transmitting points, transmitting devices, receiving devices, transmitting points, receiving points). When the base station device 3 is configured by multiple transmitting devices, each of the multiple transmitting devices may be arranged at a different position.

[0014] The base station device 3 may provide one or more service cells. A service cell may be defined as a group of resources used for wireless communication. A service cell is also referred to as a cell.

[0015] The serving cell may be configured to include at least one downlink component carrier (DLC) and / or one uplink component carrier (ULC). The serving cell may be configured to include at least two or more downlink component carriers and / or two or more uplink component carriers. Downlink component carriers and uplink component carriers are also referred to as component carriers (CARRIERS). An uplink component carrier may be used for sidelink communication.

[0016] 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 subcarrier spacing configuration u. Subcarrier spacing configuration u is also referred to as a parameter. Resource grid N size,u grid,x N RB sc The resource grid is composed of a number of subcarriers with index N start,u grid The public resource block with index N start,u grid The common resource block is also called the reference point of the resource grid. The resource grid includes N subframe,u symb OFDM symbols. The subscript x indicates the transmission direction and indicates downlink or uplink. A resource grid is provided for antenna port p, subcarrier spacing configuration u, and transmission direction x. The resource grid can be applied to downlink, uplink, and / or sidelink.

[0017] A resource grid is also called a carrier.

[0018] N is given based on at least an RRC parameter (e.g., called RRC parameter CarrierBandwidth) size,u gnd,x and N start,u grid . The RRC parameters are used to define one or more SCS (subcarrier spacing) specific carriers. One resource grid corresponds to one SCS specific carrier. One component carrier may include 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.

[0019] Figure 2 is a graph showing the subcarrier spacing configuration u, the number of OFDM symbols per time slot N slot symb An example of the relationship between and CP configuration. Figure 2 In A, for example, when the subcarrier spacing configuration u is set to 2 and the CP configuration is set to normal CP (normal cyclic prefix), N slot symb =14, N frame,u slot =40, N subframe,u slot =4. In addition, Figure 2 In B, for example, when the subcarrier spacing configuration u is set to 2 and the CP configuration is set to extended CP (extended cyclic prefix), N slot symb =12, N frame ,u slot =40, N subframe,u slot = 4. The subcarrier spacing configuration u may be applied to downlink, uplink and / or sidelink.

[0020] In wireless communication systems, the time unit T c Can be used to represent the length of the time domain. Time unit T c T c =1 / (df max *N f ). It is df max =480kHz. It is N f =4096. The constant k is k=df max *N f / (df ref N f,ref )=64. df ref 15kHz. f,ref is 2048.

[0021] The signal transmission in the downlink and / or the signal transmission in the uplink and / or the signal transmission in the sidelink may be organized into a group with a length of T f The radio frame (system frame, frame) of T f =(df max N f / 100)*T s =10ms. A radio frame is configured to include ten subframes. The subframe length is T sf =(df max Nf / 1000)T s =1ms. The number of OFDM symbols per subframe is N subframe,usymb =N slot symb N subframe,u slot .

[0022] For subcarrier spacing configuration u, the number and index of time slots included in the subframe may be given. For example, time slot index n u s Can be given in ascending order in the subframe, with values ​​from 0 to N subframe,u slot An integer value in the range of -1. For subcarrier spacing configuration u, the number of slots included in the radio frame and the index of the slots included in the radio frame may be given. In addition, the slot index n u s,f Can be given in ascending order in a radio frame, with values ​​from 0 to N frame,u slot Integer value in the range -1. Continuous N slot symb OFDM symbols can be included in one time slot. slot symb =14.

[0023] Figure 3 is a diagram showing an example of a method of configuring a resource grid. Figure 3 The horizontal axis in indicates the frequency domain. Figure 3 An example of a configuration of a resource grid with a subcarrier spacing configuration u=u1 in a component carrier 300 and an example of a configuration of a resource grid with a subcarrier spacing configuration u=u2 in a component carrier are shown. One or more subcarrier spacing configurations may be set for a component carrier. Figure 3 It is assumed that u1=u2-1, but various aspects of the embodiment are not limited to the condition u1=u2-1.

[0024] Component carrier 300 is a frequency band having a predetermined width in the frequency domain.

[0025] Point 3000 is an identifier for identifying a subcarrier. Point 3000 is also referred to as point A. Common resource block (CRB) set 3100 is a set of common resource blocks for subcarrier spacing configuration u1.

[0026] In the common resource block set 3100, the point 3000 (composed of Figure 3 The common resource block of the common resource block set 3100 (indicated by the upper right slash in FIG. 1 ) 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 an index of 0 in the common resource block set 3100.

[0027] Offset 3011 is an offset from the reference point of common resource block set 3100 to the reference point of resource grid 3001. Offset 3011 is indicated by the number of common resource blocks relative to subcarrier spacing configuration u1. Resource grid 3001 includes N starting from the reference point of resource grid 3001. size,u grid1,x A common resource block.

[0028] The offset 3013 is the reference point from the resource grid 3001 to the reference point of the BWP (Bandwidth Part) 3003 indexed as i1 (N start u BWP,i1 ) offset.

[0029] The common resource block set 3200 is a common resource block set with respect to the subcarrier spacing configuration u2.

[0030] The points 3000 in the common resource block set 3200 (consisting of Figure 3 The common resource block of the common resource block set 3200 (the block indicated by the upper left slash in FIG. 1 ) is also referred to as a reference point of the common resource block set 3200. The reference point of the common resource block set 3200 may be a common resource block with an index of 0 in the common resource block set 3200.

[0031] Offset 3012 is an offset from the reference point of common resource block set 3200 to the reference point of resource grid 3002. Offset 3012 is indicated by the number of common resource blocks for subcarrier spacing configuration u=U2. Resource grid 3002 includes N starting from the reference point of resource grid 3002. size,u grid2,x A common resource block.

[0032] Offset 3014 is the reference point from resource grid 3002 to the reference point of BWP 3004 with index i2 (N start ,u BWP,i2 ) offset.

[0033] Figure 4 3001 is a diagram showing a configuration example of the resource grid 3001. Figure 4 In the resource grid, the horizontal axis indicates the OFDM symbol index l sym , and the vertical axis indicates the subcarrier index k sc The resource grid 3001 includes N size,u grid1 ,xN RB sc subcarriers, and includes N subframes,u symb OFDM symbols. The subcarrier index k in the resource grid sc and OFDM symbol index l symA specified resource is also called a resource element (RE).

[0034] Resource blocks (RBs) include N RB sc A resource block is a generic name for common resource blocks, physical resource blocks (PRBs), and virtual resource blocks (VRBs). RB sc =12.

[0035] A resource block unit is a group of resources corresponding to one OFDM symbol in one resource block. That is, one resource block unit includes 12 resource elements corresponding to one OFDM symbol in one resource block.

[0036] The common resource blocks for subcarrier spacing configuration u are indexed in ascending order in the frequency domain starting from 0 in the common resource block set. The common resource block with index 0 for subcarrier spacing configuration u includes point 3000 (or conflicts with, matches with). The index n of the common resource block relative to subcarrier spacing configuration u is u CRB Satisfy n u CRB =ceil(k SC / N RB SC The subcarrier with ksc=0 is a subcarrier with the same center frequency as the center frequency of the subcarrier corresponding to point 3000.

[0037] The physical resource blocks for subcarrier spacing configuration u are indexed in the BWP in the frequency domain in ascending order starting from 0. The index n of the physical resource block relative to the subcarrier spacing configuration u is u PRB Satisfy n u CRB =n u PRB +N start，u BWP,i Relationship. start ,u BWP,i Indicates the reference point of the BWP with index L.

[0038] A BWP is defined as a subset of common resource blocks included in a resource grid. A BWP includes start u BWP,i Starting N size,u BWP,i The BWP of a downlink component carrier is also called a downlink BWP. The BWP of an uplink component carrier is also called an uplink BWP. The BWP of a sidelink is also called a sidelink BWP.

[0039] An antenna port is defined such that the channel on which a symbol on the antenna port is transmitted can be inferred from the channel on which another symbol on the same antenna port is transmitted. For example, a channel may correspond to a physical channel. For example, a symbol may correspond to an OFDM symbol. For example, a symbol may correspond to a resource block unit. For example, a symbol may correspond to a resource element.

[0040] If large-scale properties of the channel transmitted by symbols on one antenna port can be inferred from the channel transmitted by symbols on another antenna port, then the two antenna ports are said to be QCL (quasi co-located). The large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters.

[0041] Carrier aggregation can be used to communicate using multiple aggregated serving cells. Carrier aggregation can be communication using multiple aggregated link component carriers. Carrier aggregation can be communication using multiple aggregated downlink component carriers. Carrier aggregation can be communication using multiple aggregated uplink component carriers.

[0042] Figure 5 is a schematic block diagram showing a configuration example of the base station device 3. Figure 5 As shown, the base station device 3 includes at least part or all of a wireless transmission / reception unit (physical layer processing unit) 30 and a high-level processing unit 34. The wireless transmission / reception unit 30 includes at least part or all of an antenna unit 31, an RF unit 32 (radio frequency unit 32) and a baseband unit 33. The high-level processing unit 34 includes at least part or all of a medium access control layer processing unit 35 and a radio resource control (RRC) layer processing unit 36.

[0043] The wireless transmitting / receiving unit 30 includes at least part or all of a wireless transmitting unit 30a and a wireless receiving unit 30b. The configuration of the baseband unit 33 included in the wireless transmitting unit 30a and the configuration of the baseband unit 33 included in the wireless receiving unit 30b may be the same or different. The configuration of the RF unit 32 included in the wireless transmitting unit 30a and the configuration of the RF unit 32 included in the wireless receiving unit 30b may be the same or different. The configuration of the antenna unit 31 included in the wireless transmitting unit 30a and the configuration of the antenna unit 31 included in the wireless receiving unit 30b may be the same or different.

[0044] The high-level processing unit 34 provides downlink data (transmission block) to the wireless transmission / reception unit 30 (or the wireless transmission unit 30a). The high-level processing unit 34 performs processing of the medium access control (MAC) layer, the packet data convergence protocol layer (PDCP layer), the radio link control layer (RLC layer) and / or the RRC layer.

[0045] The medium access control layer processing unit 35 included in the higher layer processing unit 34 performs processing of the MAC layer.

[0046] The radio resource control layer processing unit 36 ​​included in the higher layer processing unit 34 performs processing 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 the RRC parameters based on the RRC message received from the terminal device 1.

[0047] 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 the OFDM symbols in the physical signal into a time-continuous signal and thus converts it into a baseband 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) can arrange the baseband signal (or the physical signal) on the component carrier and transmit the baseband signal (or the physical signal) to the terminal device 1.

[0048] The wireless transmission / reception unit 30 (or the wireless reception unit 30b) performs processing such as demodulation and decoding. The wireless transmission / reception unit 30 (or the wireless reception unit 30b) separates, demodulates and decodes the received physical signal, and provides the decoded information to the high-level processing unit 34. The wireless transmission / reception unit 30 (or the wireless reception unit 30b) may perform a channel access process before the transmission of the physical signal.

[0049] The RF unit 32 demodulates the physical signal received via the antenna unit 31 into a baseband signal (down-converts) and / or removes an extra frequency component. The RF unit 32 provides the baseband unit 33 with the processed analog signal.

[0050] The baseband unit 33 converts the analog signal (signal on radio frequency) input from the RF unit 32 into a digital signal (baseband signal). The baseband unit 33 separates a portion corresponding to a CP (cyclic prefix) from the digital signal. The baseband unit 33 performs a fast Fourier transform (FFT) on the digital signal from which the CP has been removed. The baseband unit 33 provides a physical signal in the frequency domain.

[0051] The baseband unit 33 performs inverse fast Fourier transform (IFFT) on the downlink data to generate OFDM symbols, adds CP to the generated OFDM symbols, generates a digital signal (baseband signal), and converts the digital signal into an analog signal. The baseband unit 33 provides the analog signal to the RF unit 32.

[0052] The RF unit 32 removes an extra frequency component from the analog signal (signal on the radio frequency) input from the baseband unit 33, up-converts the analog signal to the radio frequency, and transmits the signal via the antenna unit 31. The RF unit 32 may have a function of controlling the transmission power. The RF unit 32 is also called a transmission power control unit.

[0053] 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 .

[0054] Each serving cell in the serving cell group for the terminal device 1 may be any one of a PCell (primary cell), a PSCell (primary SCG cell), and a SCell (secondary cell).

[0055] The PCell is a serving cell included in the MCG (Master Cell Group). The PCell is a cell (implementation cell) in which the terminal device 1 performs an initial connection establishment procedure or a connection reestablishment procedure.

[0056] The PSCell is a serving cell included in an SCG (Secondary Cell Group). The PSCell is a serving cell to which the terminal device 1 performs random access in a reconfiguration procedure with synchronization (Reconfiguration with Synchronization).

[0057] SCell can be included in either MCG or SCG.

[0058] A serving cell group (cell group) is a name including at least MCG and SCG. A 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 a serving cell group may be operated through carrier aggregation.

[0059] 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).

[0060] In one or more downlink BWP sets for a serving cell (or downlink component carrier), one downlink BWP may be set as an active downlink BWP (or one downlink BWP may be activated). In one or more uplink BWP sets for a serving cell (or uplink component carrier), one uplink BWP may be set as an active uplink BWP (or one uplink BWP may be activated).

[0061] PDSCH, PDCCH, CSI-RS and other physical downlink channels / signals may be received in an active downlink BWP. Terminal device 1 may receive PDSCH, PDCCH and CSI-RS in an active downlink BWP. In addition, in some cases, terminal device 1 may receive CSI-RS or other physical downlink channels / signals (e.g., positioning RS (PRS)) in an inactive downlink BWP or in a cell that is not a serving cell. PUCCH, PUSCH, SRS and other physical uplink channels / signals may be transmitted on an active uplink BWP. Terminal device 1 may transmit PUCCH, PUSCH, SRS and other physical uplink channels / signals in an active uplink BWP. In addition, in some cases, terminal device 1 may receive SRS or other physical uplink channels / signals (e.g., SRS for positioning) in an inactive uplink BWP or in a cell that is not a serving cell. Active downlink BWP and active uplink BWP are also referred to as active BWP.

[0062] Downlink BWP switching deactivates an active downlink BWP and activates one of the inactive downlink BWPs other than the active downlink BWP. Downlink BWP switching may be controlled by a BWP field included in downlink control information. Downlink BWP switching may be controlled based on higher layer parameters.

[0063] Uplink BWP switching is used to deactivate an active uplink BWP and activate any inactive uplink BWP except the active uplink BWP. Uplink BWP switching may be controlled by a BWP field included in the downlink control information. Uplink BWP switching may be controlled based on higher layer parameters.

[0064] In the one or more downlink BWP sets 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 specific time.

[0065] In the one or more uplink BWP sets 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 specific time.

[0066] The above process for uplink BWP is applicable to sidelink BWP.

[0067] Figure 6 1 is a schematic block diagram showing a configuration example of a terminal device 1 (including a target UE 4 and an anchor UE 5 described later). Figure 6 As shown, the terminal device 1 includes at least part or all of a wireless transmission / reception unit (physical layer processing unit) 10 and a high-level processing unit 14. The wireless transmission / reception unit 10 includes at least part or all of an antenna unit 11, an RF unit 12, and a baseband unit 13. The high-level processing unit 14 includes at least part or all of a medium access control layer processing unit 15 and a radio resource control layer processing unit 16.

[0068] The wireless transmitting / receiving unit 10 includes at least part or all of a wireless transmitting unit 10a and a wireless receiving unit 10b. The configuration of the baseband unit 13 included in the wireless transmitting unit 10a and the configuration of the baseband unit 13 included in the wireless receiving unit 10b may be the same or different. The configuration of the RF unit 12 included in the wireless transmitting unit 10a and the configuration of the RF unit 12 included in the wireless receiving unit 10b may be the same or different. The configuration of the antenna unit 11 included in the wireless transmitting unit 10a and the configuration of the antenna unit 11 included in the wireless receiving unit 10b may be the same or different.

[0069] The high-level processing unit 14 provides uplink or sidelink data (transmission block) to the wireless transmit / receive unit 10 (or the wireless transmit unit 10a). The high-level processing unit 14 performs processing of the MAC layer, the packet data integration protocol layer, the radio link control layer and / or the RRC layer. The high-level processing unit 14 can also perform processing of the MAC layer, the packet data integration protocol layer, the radio link control layer and / or the RRC layer for PC5.

[0070] The medium access control layer processing unit 15 included in the higher layer processing unit 14 performs processing of the MAC layer.

[0071] The radio resource control layer processing unit 16 included in the high-level processing unit 14 performs RRC layer processing and / or PC5 RRC (PC5-RRC) processing. 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 the RRC parameters based on the RRC message received from the base station device 3, and / or configures the PC5 RRC parameters based on the PC5RRC (PC5-RRC) message received from other terminal devices.

[0072] 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 uplink data and / or sidelink data. The wireless transmission / reception unit 10 (or the wireless transmission unit 10a) converts the OFDM symbol in the physical signal into a time-continuous signal and thus converts it into a baseband signal. The wireless transmission / reception unit 10 (or the wireless transmission unit 10a) transmits the baseband signal (or the physical signal) to the base station device 3 or another terminal device via radio frequency. The wireless transmission / reception unit 10 (or the wireless transmission unit 10a) can arrange the baseband signal (or the physical signal) on the BWP (active uplink BWP) and transmit the baseband signal (or the physical signal) to the base station device 3.

[0073] The wireless transmission / reception unit 10 (or wireless reception unit 10b) performs processing such as demodulation and decoding. The wireless transmission / reception unit 10 (or wireless reception unit 10b) may receive a physical signal in a BWP (active downlink BWP) and / or a side link BWP of a serving cell. The wireless transmission / reception unit 10 (or wireless reception unit 10b) separates, demodulates, and decodes the received physical signal, and provides decoded information to a high-level processing unit 14. The wireless transmission / reception unit 10 (or wireless reception unit 10b) may perform a channel access procedure before transmission of a physical signal.

[0074] The RF unit 12 demodulates the physical signal received via the antenna unit 11 into a baseband signal (down-converts) and / or removes an extra frequency component. The RF unit 12 provides the baseband unit 13 with the processed analog signal.

[0075] The baseband unit 13 converts an analog signal (signal on a radio frequency) input from the RF unit 12 into a digital signal (baseband signal). The baseband unit 13 separates a portion corresponding to the CP from the digital signal, performs a fast Fourier transform on the digital signal from which the CP has been removed, and provides a physical signal in the frequency domain.

[0076] The baseband unit 13 performs inverse fast Fourier transform on the uplink data to generate OFDM symbols, adds CP to the generated OFDM symbols, generates a digital signal (baseband signal), and converts the digital signal into an analog signal. The baseband unit 13 provides the analog signal to the RF unit 12.

[0077] The RF unit 12 removes an extra frequency component from the analog signal (signal on a radio frequency) input from the baseband unit 13, up-converts the analog signal to a radio frequency, and transmits the signal 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.

[0078] Hereinafter, a physical signal (signal) will be described.

[0079] Physical signal is a general term used for downlink physical channel, downlink physical signal, uplink physical channel, uplink physical signal, sidelink physical channel and sidelink physical signal. Physical channel is a general term used for downlink physical channel, uplink physical channel and sidelink physical channel.

[0080] An uplink physical channel may correspond to a group of resource elements that carry information and / or uplink control information originating from a higher layer. An uplink physical channel may be a physical channel used in an uplink component carrier. An uplink physical channel may be transmitted by a terminal device 1. An uplink physical channel may be received by a base station device 3. In a 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.

[0081] PUCCH can be used to transmit uplink control information (UCI). PUCCH can be sent to deliver (transmit, transmit) uplink control information. Uplink control information can be mapped to PUCCH (or arranged in PUCCH). Terminal device 1 can transmit PUCCH in which uplink control information is arranged. Base station device 3 can receive PUCCH in which uplink control information is arranged.

[0082] The 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).

[0083] The channel state information is transmitted by using a channel state information bit or a channel state information sequence. The scheduling request is also called a scheduling request bit or a scheduling request sequence. The HARQ-ACK information is also called a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0084] The HARQ-ACK information may include a HARQ-ACK state corresponding 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 state may indicate an ACK (acknowledgement) or NACK (negative acknowledgement) corresponding to the transport block. ACK may indicate that the transport block has been successfully decoded. NACK may indicate that the transport block has not been successfully decoded. The HARQ-ACK information may include a HARQ-ACK codebook, which includes one or more HARQ-ACK states (or HARQ-ACK bits).

[0085] For example, the correspondence between the HARQ-ACK information and the transport block may mean that the HARQ-ACK information corresponds to the PDSCH used for transmission of the transport block.

[0086] The HARQ-ACK status may indicate ACK or NACK corresponding to one CBG (Code Block Group) included in a transport block.

[0087] The scheduling request may be used at least to request PUSCH (or UL-SCH) resources for new transmission. The scheduling request may be used to indicate a positive SR or a negative SR. The fact that the scheduling request indicates a positive SR is also referred to as "sending a positive SR". A positive SR may indicate that the terminal device 1 is requesting PUSCH (or UL-SCH) resources for initial transmission. A positive SR may indicate that a higher layer will trigger a scheduling request. A positive SR may be sent when a higher layer commands sending a scheduling request. The fact that the scheduling request bit indicates a negative SR is also referred to as "sending a negative SR". A negative SR may indicate that the terminal device 1 is not requesting PUSCH (or UL-SCH) resources for initial transmission. A negative SR may indicate A negative SR may be sent if the upper layer does not command the sending of a scheduling request.

[0088] 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 channel quality, and PMI is an indicator related to a precoder. RI is an indicator related to a transmission level (or the number of transmission layers).

[0089] The channel state information may be provided based at least on the reception of one or more physical signals (e.g., one or more CSI-RS) at least for channel measurement. The terminal device 1 may select the channel state information based at least on the reception of one or more physical signals for channel measurement. The channel measurement may include interference measurement.

[0090] The PUCCH may correspond to a PUCCH format. The PUCCH may be a set of resource elements used to transmit the PUCCH format. The PUCCH may include a PUCCH format. The PUCCH format may include UCI.

[0091] PUSCH can be used to transmit uplink data (transport block) and / or uplink control information. PUSCH can be used to transmit uplink data (transport block) and / or uplink control information corresponding to UL-SCH. PUSCH can be used to transmit uplink data (transport block) and / or uplink control information. PUSCH can be used to transmit uplink data (transport block) and / or uplink control information corresponding to UL-SCH. Uplink data (transport block) may be arranged in PUSCH. Uplink data (transport block) corresponding to UL-SCH may be arranged in PUSCH. Uplink control information may be arranged to PUSCH. Terminal device 1 may transmit PUSCH in which uplink data (transport block) and / or uplink control information are arranged. Base station device 3 may receive PUSCH in which uplink data (transport block) and / or uplink control information are arranged.

[0092] PRACH can be used to transmit a random access preamble. PRACH can be used to transmit a random access preamble. The sequence x of PRACH u,v (n) by x u,v (n) = x u (mod(n+C v ,L RA ))Definition. u It can be a ZC sequence (Zadoff-Chu sequence). u Can be obtained by x u =exp(-jpui(i+1) / L RA ) definition. j is an imaginary unit. p is the circulation ratio. C v Corresponds to the cyclic shift of PRACH. RA Corresponds to the length of PRACH. RA It can be 839 or 139 or another value. i is between 0 and L RA An integer in the range of -1. u is a sequence index of PRACH. Terminal device 1 can transmit PRACH. Base station device 3 can receive PRACH.

[0093] For a given PRACH opportunity, 64 random access preambles are defined. At least based on the cyclic shift C of the PRACH v and the PRACH sequence index u to specify (determine, give) the random access preamble code.

[0094] An uplink physical signal may correspond to a group of resource elements. An uplink physical signal may not carry information generated in a higher layer. An uplink physical signal may be a physical signal used in an uplink component carrier. Terminal device 1 may transmit an uplink physical signal. Base station device 3 may receive an uplink physical signal. In a radio communication system according to one aspect of the present embodiment, at least part or all of UL DMRS (uplink demodulation reference signal), SRS (sounding reference signal), and UL PTRS (uplink phase tracking reference signal) may be used.

[0095] UL DMRS is a common name for DMRS for PUSCH and DMRS for PUCCH.

[0096] A set of antenna ports for DMRS for PUSCH (DMRS associated with PUSCH, DMRS included in PUSCH, DMRS corresponding to PUSCH) may be given based on a set of antenna ports for PUSCH. That is, a set of DMRS antenna ports for PUSCH may be the same as a set of antenna ports for PUSCH.

[0097] The transmission of the PUSCH and the transmission of the 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 the PUSCH. The transmission of the PUSCH may be the transmission of the PUSCH and the DMRS for the PUSCH.

[0098] The PUSCH can be estimated from the DMRS used for the PUSCH. That is, the propagation path of the PUSCH can be estimated from the DMRS used for the PUSCH.

[0099] A set of antenna ports for a DMRS of a PUCCH (DMRS associated with a PUCCH, DMRS included in a PUCCH, DMRS corresponding to a PUCCH) may be the same as a set of antenna ports of the PUCCH.

[0100] The transmission of PUCCH and the transmission of DMRS for PUCCH may be indicated (or triggered) by a DCI format. The arrangement of PUCCH in resource elements (resource element mapping) and / or the arrangement of DMRS for PUCCH in resource elements may be provided by at least one PUCCH format. PUCCH and DMRS for PUCCH may be collectively referred to as PUCCH. The transmission of PUCCH may be the transmission of PUCCH and DMRS for PUCCH.

[0101] The PUCCH can be estimated from the DMRS used for the PUCCH. That is, the propagation path of the PUCCH can be estimated from the DMRS used for the PUCCH.

[0102] A downlink physical channel may correspond to a group of resource elements that carry information from a higher layer and / or downlink control information. A downlink physical channel may be a physical channel used in a downlink component carrier. The base station device 3 may transmit a downlink physical channel. The terminal device 1 may receive a downlink physical channel. In a wireless communication system according to one aspect of the present embodiment, at least part or all of a PBCH (Physical Broadcast Channel), a PDCCH (Physical Downlink Control Channel), and a PDSCH (Physical Downlink Shared Channel) may be used.

[0103] PBCH can be used to transmit MIB (Master Information Block) and / or physical layer control information. Physical layer control information is a type of downlink control information. PBCH can be sent to deliver MIB and / or physical layer control information. BCH can be mapped (or corresponded) to PBCH. Terminal device 1 can receive PBCH. Base station device 3 can transmit PBCH. Physical layer control information is also called PBCH payload and timing-related PBCH payload. MIB may include one or more high-level parameters.

[0104] The physical layer control information includes 8 bits. The physical layer control information may include at least part or all of 0A to 0D. 0A is radio frame information. 0B is half radio frame information (half system frame information). 0C is SS / PBCH block index information. 0D is subcarrier offset information.

[0105] The radio frame information is used to indicate the radio frame in which the PBCH is transmitted (including the radio frame of the time 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 be used to identify at least radio frames from index 0 to index 1023.

[0106] The half radio frame information is used to indicate whether the PBCH is transmitted in the first five subframes or in the last five subframes in the radio frame 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 the first half of the five subframes in the ten subframes included in the radio frame. The half radio frame may be configured by the last half of the five subframes in the ten subframes included in the radio frame.

[0107] The SS / PBCH block index information is used to indicate the SS / PBCH block index. The SS / PBCH block index information may be represented by 3 bits. The SS / PBCH block index information may be composed of 3 bits of the SS / PBCH block index indicator. The SS / PBCH block index indicator may include 6 bits. The SS / PBCH block index indicator may be used to identify at least SS / PBCH blocks from index 0 to index 63 (or from index 0 to index 3, from index 0 to index 7, from index 0 to index 9, from index 0 to index 19, etc.).

[0108] The subcarrier offset information is used to indicate the 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.

[0109] The PDCCH may be used to transmit downlink control information (DCI). The PDCCH may be transmitted to deliver downlink control information. The downlink control information may be mapped to the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is arranged. The base station device 3 may transmit the PDCCH in which the downlink control information is arranged.

[0110] The downlink control information may correspond to a DCI format. The downlink control information may be included in the DCI format. The downlink control information may be arranged in each field of the DCI format.

[0111] DCI format is a generic name for DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format 1_1. Uplink DCI format is a generic name for DCI format 0_0 and DCI format 0_1. Downlink DCI format is a generic name for DCI format 1_0 and DCI format 1_1.

[0112] PDSCH can be used to transmit one or more transport blocks. PDSCH can be used to transmit one or more transport blocks corresponding to DL-SCH. PDSCH can be used to transmit one or more transport blocks. PDSCH can be used to transmit one or more transport blocks corresponding to DL-SCH. One or more transport blocks can be arranged in PDSCH. One or more transport blocks corresponding to DL-SCH can be arranged in PDSCH. Base station device 3 can transmit PDSCH. Terminal device 1 can receive PDSCH.

[0113] A downlink physical signal may correspond to a group of resource elements. A downlink physical signal may not carry information generated in a higher layer. A downlink physical signal may be a physical signal used in a downlink component carrier. A downlink physical signal may be transmitted by a base station device 3. A downlink physical signal may be transmitted by a terminal device 1. In a wireless communication system according to one aspect of the present embodiment, at least part or all of SS (synchronization signal), DL DMRS (downlink demodulation reference signal), CSI-RS (channel state information reference signal) and DL PTRS (downlink phase tracking reference signal) may be used.

[0114] The synchronization signal may be used at least for the terminal device 1 to synchronize in the frequency domain and / or time domain for the downlink. The synchronization signal is a common name for PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

[0115] Figure 7 is a diagram showing a configuration example of an SS / PBCH block. Figure 7 In the figure, the horizontal axis indicates the time domain (OFDM symbol index l sym ), and the vertical axis indicates the frequency domain. The oblique line block indicates a group of resource elements of the PSS. The grid line block indicates a group of resource elements of the SSS. In addition, the block in the horizontal line indicates a group of resource elements of the PBCH and a group of resource elements of the DMRS for the PBCH (DMRS related to the PBCH, DMRS included in the PBCH, corresponding to the DMRS of the PBCH).

[0116] like Figure 7As shown, the SS / PBCH block includes PSS, SSS and PBCH. The SS / PBCH block includes 4 consecutive OFDM symbols. The SS / PBCH block includes 240 subcarriers. PSS is allocated the 57th to 183rd subcarriers of the first OFDM symbol. SSS is allocated the 57th to 183rd subcarriers of the third OFDM symbol. The first subcarrier to the 56th subcarrier of the first OFDM symbol may be set to zero. The 184th to the 240th subcarrier of the first OFDM symbol may be set to zero. The 49th to the 56th subcarrier of the third OFDM symbol may be set to zero. The 184th to the 192nd subcarrier of the third OFDM symbol may be set to zero. In the first to the 240th subcarrier of the second OFDM symbol, the PBCH is allocated subcarriers that are not allocated to the DMRS for the PBCH. In the first to the 48th subcarrier of the third OFDM symbol, the PBCH is allocated subcarriers that are not allocated to the DMRS for the PBCH. In the 193rd to 240th subcarriers of the third OFDM symbol, the PBCH is allocated subcarriers not allocated to the DMRS for the PBCH. In the 1st to 240th subcarriers of the 4th OFDM symbol, the PBCH is allocated subcarriers not allocated to the DMRS for the PBCH.

[0117] The antenna ports of PSS, SSS, PBCH, and DMRS for PBCH in the SS / PBCH block may be the same.

[0118] The PBCH can be estimated from the DMRS for PBCH. For the DM-RS for PBCH, the channel on which a symbol for PBCH on an antenna port is transmitted can be inferred from the channel on which another symbol for DM-RS on an antenna port is transmitted only when the two symbols are within the SS / PBCH block transmitted in the same slot and have the same SS / PBCH block index.

[0119] DL DMRS is a common name for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0120] A set of antenna ports for DMRS of PDSCH (DMRS associated with PDSCH, DMRS included in PDSCH, DMRS corresponding to PDSCH) may be given based on a set of antenna ports of PDSCH. A set of antenna ports for DMRS of PDSCH may be the same as a set of antenna ports of PDSCH.

[0121] Transmission of the PDSCH and transmission of the 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 the PDSCH. Transmitting the PDSCH may be transmitting the PDSCH and the DMRS for the PDSCH.

[0122] The PDSCH can be estimated from the DMRS for the PDSCH. For the DM-RS associated with the PDSCH, the channel on which a symbol for the PDSCH on one antenna port is transmitted can be inferred from the channel on which another symbol for the DM-RS on the antenna port is transmitted only if both symbols are within the same resources as the scheduled PDSCH, in the same time slot, and in the same PRG (precoding resource group).

[0123] An antenna port for a DMRS of a PDCCH (a DMRS associated with a PDCCH, a DMRS included in a PDCCH, a DMRS corresponding to a PDCCH) may be the same as an antenna port of the PDCCH.

[0124] The PDCCH can be estimated from the DMRS for the PDCCH. For the DM-RS associated with the PDCCH, the channel on which a symbol for the PDCCH on one antenna port is transmitted can be inferred from the channel on which another symbol for the DM-RS on the same antenna port is transmitted only if the two symbols are within resources that the UE can assume that they use the same precoding (i.e., within resources in a REG packet).

[0125] BCH (Broadcast Channel), UL-SCH (Uplink Shared Channel) and DL-SCH (Downlink Shared Channel) are transport channels. The channels used in the MAC layer are called transport channels. The unit of the transport channel used in the MAC layer is also called a transport block (TB) or a MAC PDU (Protocol Data Unit). In the MAC layer, HARQ (Hybrid Automatic Repeat Request) control is performed for each transport block. A transport block is a unit of data delivered by the MAC layer to the physical layer. In the physical layer, a transport block is mapped to a codeword, and a modulation process is performed on each codeword.

[0126] One UL-SCH and one DL-SCH may be provided for each serving cell. BCH may be provided for PCell. BCH may not be provided for PSCell and SCell.

[0127] BCCH (Broadcast Control Channel), CCCH (Common Control Channel) and DCCH (Dedicated Control Channel) are logical channels. BCCH is a channel used by the RRC layer to deliver MIB or system information. CCCH can be used to transmit common RRC messages in multiple terminal devices 1. CCCH can be used for terminal devices 1 that are not connected by RRC. DCCH can be used at least to transmit dedicated RRC messages to terminal devices 1. DCCH can be used for terminal devices 1 in RRC connected mode.

[0128] The RRC message includes one or more RRC parameters (information elements, high-layer parameters). For example, the RRC message may include a MIB. For example, the RRC message may include system information (SIB: system information block, MIB). SIB is a common name for various types of SIBs (e.g., SIB1, SIB2). For example, the RRC message may include a message corresponding to the CCCH. For example, the RRC message may include a message corresponding to the DCCH. The RRC message is a general term for a public RRC message and a dedicated RRC message.

[0129] The BCCH in a logical channel can be mapped to the BCH or DL-SCH in a transport channel. The CCCH in a logical channel can be mapped to the DL-SCH or UL-SCH in a transport channel. The DCCH in a logical channel can be mapped to the DL-SCH or UL-SCH in a transport channel.

[0130] The UL-SCH in the transport channel can be mapped to the PUSCH in the physical channel. The DL-SCH in the transport channel can be mapped to the PDSCH in the physical channel. The BCH in the transport channel can be mapped to the PBCH in the physical channel.

[0131] A high-layer parameter is a parameter included in an RRC message or a MAC CE (Medium Access Control Element). A high-layer parameter is a general name for information included in MIB, system information, a message corresponding to CCCH, a message corresponding to DCCH, and MAC CE. If a high-layer parameter is a parameter included in an RRC message, the high-layer parameter may be referred to as an RRC parameter or an RRC configuration.

[0132] The high-level parameters may be cell-specific parameters or UE-specific parameters. Cell-specific parameters are parameters that include common configurations in a cell. UE-specific parameters are parameters that include configurations that may be configured differently for each UE.

[0133] The base station device may indicate a change of a cell-specific parameter by reconfiguration with random access. The UE may change the cell-specific parameter before triggering the random access. The base station device may indicate a change of a UE-specific parameter by reconfiguration with or without random access. The UE may change the UE-specific parameter before or after the random access.

[0134] The process performed by the terminal device 1 includes at least part or all of the following 5A to 5C. 5A is a cell search. 5B is a random access. 5C is a data communication.

[0135] Cell search is a process used by terminal device 1 to synchronize with a cell in the time domain and / or frequency domain and detect a physical cell identity. Terminal device 1 can detect a physical cell ID by performing time domain and / or frequency domain synchronization with a cell through cell search.

[0136] The sequence of the PSS is given based on at least the physical cell ID. The sequence of the SSS is given based on at least the physical cell ID.

[0137] The SS / PBCH block candidate indicates a resource where there may be a transmission of an SS / PBCH block. The SS / PBCH block may be transmitted at the resource indicated as the SS / PBCH block candidate. The base station device 3 may transmit the SS / PBCH block at the SS / PBCH block candidate. The terminal device 1 may receive (detect) the SS / PBCH block at the SS / PBCH block candidate.

[0138] A set of SS / PBCH block candidates in a half radio frame is also referred to as an SS burst set. An SS burst set is also referred to as a transmission window, an SS transmission window, or a DRS transmission window (Discovery Reference Signal Transmission Window). An SS burst set is a general name including at least a first SS burst set and a second SS burst set.

[0139] The base station device 3 transmits one or more indexed SS / PBCH blocks at a predetermined period. The terminal device 1 can detect at least one SS / PBCH block of the one or more indexed SS / PBCH blocks. The terminal device 1 can attempt to decode the PBCH included in the SS / PBCH block.

[0140] Random access is a procedure including at least part or all of message 1, message 2, message 3, and message 4.

[0141] Message 1 (Msgl, Msg 1) is a process in which terminal device 1 transmits PRACH. Terminal device 1 transmits PRACH in a PRACH opportunity (RACH opportunity, RO) selected from one or more PRACH opportunities based at least on the index of the SS / PBCH block candidate detected according to the cell search.

[0142] Message 2 (Msg2, Msg 2) is a process in which the terminal device 1 attempts to detect DCI format 1_0 having CRC (Cyclic Redundancy Check) scrambled by RA-RNTI (Random Access-Radio Network Temporary Identifier). The terminal device 1 may attempt to detect DCI format 1_0 in the search space set.

[0143] Message 3 (Msg3, Msg 3) is a process for transmitting a PUSCH scheduled by a random access response grant included in a DCI format 1_0 detected in the process of Message 2. The random access response grant is indicated by a MAC CE, which is included in a PDSCH scheduled by a DCI format 1_0.

[0144] The PUSCH scheduled based on the random access response grant is message 3PUSCH or PUSCH. Message 3PUSCH contains a contention resolution identifier MAC CE. Contention resolution ID MAC CE includes a contention resolution ID.

[0145] Retransmission of message 3 PUSCH is scheduled by DCI format 0 0 with CRC scrambled by TC-RNTI (Temporary Cell-Radio Network Temporary Identifier).

[0146] Message 4 (Msg4, Msg 4) is a process of attempting to detect DCI format 1_0 with CRC scrambled by C-RNTI (Cell-Radio Network Temporary Identifier) ​​or TC-RNTI. Terminal device 1 receives PDSCH scheduled based on DCI format 1_0. PDSCH may include a conflict resolution ID.

[0147] Data communication is a general term used for downlink communication and uplink communication.

[0148] In data communication, terminal device 1 attempts to detect PDCCH in resources identified at least based on one or all of a control resource set and a search space set (attempts to monitor PDCCH, monitors PDCCH). This is also referred to as "terminal device 1 attempts to detect PDCCH in the control resource set", "terminal device 1 attempts to detect PDCCH in the search space set", "terminal device 1 attempts to detect PDCCH candidates in the control resource set", "terminal device 1 attempts to detect PDCCH candidates in the search space set", "terminal device 1 attempts to detect DCI format in the control resource set", or "terminal device 1 attempts to detect DCI format in the search space set". Monitoring PDCCH may be equivalent to monitoring the DCI format in PDCCH.

[0149] The control resource set is a resource set configured by a plurality of resource blocks in a time slot and a predetermined number of OFDM symbols.

[0150] The resource set used for the control resource set may be indicated by a higher layer parameter. The number of OFDM symbols included in the control resource set may be indicated by a higher layer parameter.

[0151] PDCCH may also be referred to as a PDCCH candidate.

[0152] A search space set may be defined as a group of PDCCH candidates. A search space set may be a common search space (CSS) set or a UE-specific search space (USS) set.

[0153] The CSS set is a generic name for a PDCCH common search space set of type 0, a PDCCH common search space set of type 0a, a PDCCH common search space set of type 1, a PDCCH common search space set of type 2, and a PDCCH common search space set of type 3. The USS set may also be referred to as a UE-specific PDCCH search space set.

[0154] The type-0 PDCCH common search space set may be used as a common search space set with an index of 0. The type-0 PDCCH common search space set may be a common search space set with an index of 0.

[0155] The search space set is associated with (included in, corresponds to) a control resource set. The index of the control resource set associated with the search space set may be indicated by a higher layer parameter.

[0156] For the search space set, part or all of 6A to 6C may be indicated by at least a high-level parameter. 6A is the PDCCH monitoring period. 6B is the PDCCH monitoring pattern within the time slot. 6C is the PDCCH monitoring offset.

[0157] The monitoring opportunity of the search space set may correspond to one or more OFDM symbols to which the first OFDM symbol of the control resource set associated with the search space set is allocated. The monitoring opportunity of the search space set may correspond to a resource identified by the first OFDM symbol of the control resource set associated with the search space set. The monitoring opportunity of the search space set is given based on at least part or all of the PDCCH monitoring periodicity, the PDCCH monitoring pattern within the time slot, and the PDCCH monitoring offset.

[0158] Figure 8 is a diagram showing an example of monitoring opportunities for a search space set. Figure 8 , search space set 91 and search space set 92 are sets in the primary cell 301 , search space set 93 is a set in the secondary cell 302 , and search space set 94 is a set in the secondary cell 303 .

[0159] exist Figure 8 , blocks indicated by grid lines indicate search space set 91, blocks indicated by upper right slanted lines indicate search space set 92, blocks indicated by upper left slanted lines indicate search space set 93, and blocks indicated by horizontal lines indicate search space set 94.

[0160] exist Figure 8, the PDCCH monitoring periodicity of search space set 91 is set to 1 time slot, the PDCCH monitoring offset of search space set 91 is set to 0 time slot, and the PDCCH monitoring pattern of search space set 91 is [1,0,0,0,0,0,0,1,0,0,0,0,0,0,0]. That is, the monitoring timing of search space set 91 corresponds to the first OFDM symbol (OFDM symbol #0) and the eighth OFDM symbol (OFDM symbol #7) in each time slot.

[0161] exist Figure 8 , the PDCCH monitoring periodicity of search space set 92 is set to 2 time slots, the PDCCH monitoring offset of search space set 92 is set to 0 time slots, and the PDCCH monitoring pattern of search space set 92 is [1,0,0,0,0,0,0,0,0,0,0,0,0,0]. That is, the monitoring timing of search space set 92 corresponds to the first OFDM symbol (OFDM symbol #0) in each even time slot in the even time slots.

[0162] exist Figure 8 , the PDCCH monitoring periodicity of search space set 93 is set to 2 time slots, the PDCCH monitoring offset of search space set 93 is set to 0 time slot, and the PDCCH monitoring mode of search space set 93 is [0,0,0,0,0,0,0,1,0,0,0,0,0,0,0]. That is, the monitoring timing of search space set 93 corresponds to the eighth OFDM symbol (OFDM symbol #8) in each even time slot.

[0163] exist Figure 8 , the PDCCH monitoring periodicity of search space set 94 is set to 2 time slots, the PDCCH monitoring offset of search space set 94 is set to 1 time slot, and the PDCCH monitoring pattern of search space set 94 is [1,0,0,0,0,0,0,0,0,0,0,0,0,0]. That is, the monitoring timing of search space set 94 corresponds to the leading OFDM symbol (OFDM symbol #0) in each odd time slot in odd time slots.

[0164] The type-0 PDCCH common search space set may be used at least for a DCI format having a cyclic redundancy check (CRC) sequence scrambled by SI-RNTI (System Information-Radio Network Temporary Identifier).

[0165] The Oa-type PDCCH common search space set may be used at least for a DCI format having a cyclic redundancy check sequence scrambled by SI-RNTI.

[0166] The type-1 PDCCH common search space set may be used for at least a DCI format having a CRC sequence scrambled by RA-RNTI (Random Access-Radio Network Temporary Identifier) ​​or a CRC sequence scrambled by TC-RNTI (Temporary Cell-Radio Network Temporary Identifier).

[0167] Type-2 PDCCH common search space set may be used for DCI formats with a CRC sequence scrambled by P-RNTI (Paging-Radio Network Temporary Identifier).

[0168] A type-3 PDCCH common search space set is available for DCI formats with a CRC sequence scrambled by a C-RNTI (Cell-Radio Network Temporary Identifier).

[0169] The UE-specific search space set may be used at least for DCI formats with a CRC sequence scrambled by the C-RNTI.

[0170] In downlink communication, terminal device 1 can detect the downlink DCI format. The detected downlink DCI format is used at least for resource allocation of PDSCH. The detected downlink DCI format is also called downlink allocation. Terminal device 1 attempts to receive PDSCH. Based on the PUCCH resources indicated according to the detected downlink DCI format, the HARQ-ACK corresponding to the PDSCH (corresponding to the HARQ-ACK of the transport block included in the PDSCH) can be reported to the base station device 3.

[0171] In uplink communication, the terminal device 1 can detect the uplink DCI format. The detected uplink DCI format is used at least for resource allocation of PUSCH. The detected uplink DCI format is also called uplink grant. The terminal device 1 transmits PUSCH.

[0172] PUSCH transmissions may be dynamically scheduled by an UL grant in the DCI, or the transmission may correspond to a grant configured for class 1 or class 2. Granted PUSCH transmissions configured for class 1 are semi-statically configured to operate upon receipt of a higher layer parameter configuredGrantConfig including an rrc-ConfiguredUplinkGrant, without detecting an UL grant in the DCI. Granted PUSCH transmissions configured for class 2 are semi-persistently scheduled by effectively activating an UL grant in the DCI according to these procedures, after receipt of a higher layer parameter configuredGrantConfig not including an rrc-ConfiguredUplinkGrant. If configuredGrantConfigToAddModList is configured, more than one configured grant configuration with a grant configured for class 1 and / or a grant configured for class 2 may be active on the active BWP of the serving cell at the same time.

[0173] Fig. 9 is a diagram showing an example of a random access procedure of the terminal device 1 according to the present embodiment.

[0174] In 901, the terminal device 1 transmits a random access preamble to the base station device (BS) 3 via the PRACH. The transmitted random access preamble may be referred to as message 1 (Msg1, Msg 1). The transmission of the random access preamble will also be referred to as PRACH transmission. The random access preamble is configured to notify BS 3 of information using one of a plurality of sequences. For example, 64 sequences (the number of random access preamble indexes is in the range of 1 to 64) are prepared. In the case where 64 sequences are prepared, 6 bits of information (which may be ra-PreambleIndex or preamble index) can be indicated to BS3. The information may be indicated as a random access preamble identifier (Random Access Preamble Identifier, RAPID).

[0175] In the case of a contention-based random access procedure, the index of the random access preamble is randomly selected by the terminal device 1 itself. In the contention-based random access procedure, the terminal device 1 selects an SS / PBCH block having an SS / PBCH block RSRP exceeding a configured threshold, and performs the selection of a preamble group. In the case where the relationship between the SS / PBCH block and the random access preamble has been configured, the terminal device 1 randomly selects ra-PreambleIndex from one or more random access preambles associated with the selected SS / PBCH block and the selected preamble group, and sets the selected ra-PreambleIndex as the preamble index (PREAMBLE_INDEX). In addition, for example, the selected SS / PBCH block and the selected preamble group can be divided into two subgroups based on the transmission size of Msg3. The terminal device 1 may randomly select a preamble code index from a subgroup corresponding to a small transmission size of Msg3 903 when the transmission size of Msg3 903 is small, or may randomly select a preamble code index from a subgroup corresponding to a large transmission size of Msg3 903 when the transmission size of Msg3 903 is large. In general, an index is selected when the message size is small when the characteristics of the transmission path are poor (or the distance between the terminal device 1 and the BS 3 is long), and an index is selected when the message size is large when the characteristics of the transmission path are good (or the distance between the terminal device 1 and the BS 3 is short).

[0176] In the case of a non-contention-based random access procedure, the index of the random access preamble is selected based on the information received by the terminal device 1 from the BS 3. At this time, the information received by the terminal device 1 from the BS 3 may also be included in the PDCCH. In the case where the values ​​of the bits of the information received from the BS 3 are all 0, the terminal device 1 performs a contention-based random access procedure, and the terminal device 1 selects the index of the random access preamble by itself.

[0177] Next, BS 3, which has received Msgl 901, generates a RAR message including an uplink grant (random access response grant, RAR UL grant) for indicating transmission to terminal device 1, and transmits a random access response including the generated RAR message to terminal device 1 in DL-SCH in 902. In other words, BS 3 transmits a random access response including a RAR message corresponding to the random access preamble transmitted in 901 in the PDSCH in the primary cell. The PDSCH corresponds to the PDCCH including the RA-RNTI. The RA-RNTI is calculated by RA-RNTI=1+s_id+14xt_id+14x80xf_id+14x80x8xul_carrier_id. Here, value. t_id is the index of the first time slot of the PRACH in the system frame and is a value from 0 to 79. f_id is the index of the PRACH in the frequency domain and is a value from 0 to 7. ul_carrier_id is the uplink carrier used for Msg1 transmission. The ul_carrier_id of the NUL carrier is 0, and the ul_carrier_id of the SUL carrier is 1.

[0178] The random access response may be referred to as message 2 (Msg2, Msg 2) 902. In addition, BS 3 includes a random access preamble identifier corresponding to the received random access preamble and a RAR message (MAC RAR) corresponding to the identifier in Msg2. BS 3 calculates the deviation of the transmission timing between the terminal device 1 and BS 3 based on the received random access preamble, and includes the transmission timing adjustment information (timing advance (TA) command) used to adjust the deviation in the RAR message. The RAR message includes at least a random access response authorization field mapped to an uplink grant, a temporary C-RNTI field to which a temporary cell radio network temporary identifier (C-RNTI) is mapped, and a timing advance (TA) command. The terminal device 1 adjusts the timing of the PUSCH transmission based on the TA command. The timing of the PUSCH transmission can be adjusted for each cell group. BS 3 includes a random access preamble identifier corresponding to the received random access preamble in Msg2 902.

[0179] In order to respond to the PRACH transmission, the terminal device 1 detects (monitors) the DCI format 1_0 to which the CRC parity bits scrambled with the corresponding RA-RNTI are added during the time period of the random access response window. The time period (window size) of the random access response window is provided by the high-level parameter ra-ResponseWindow. The window size is the number of time slots based on the subcarrier spacing of the class 1 PDCCH common search space.

[0180] In the case where the terminal device 1 detects a DCI format 1_0 to which a CRC scrambled with RA-RNTI is added and a PDSCH including a DL-SCH transport block within the time period of the window, the terminal device 1 passes the transport block to the upper layer. The upper layer analyzes the transport block for the random access preamble identifier (RAPID) associated with the PRACH transmission. In the case where the upper layer identifies the RAPID included in the RAR message of the DL-SCH transport block, the upper layer indicates the uplink grant for the physical layer. This identification means that the RAPID included in the received random access response is the same as the RAPID corresponding to the transmitted random access preamble. The uplink grant is called a random access response uplink grant (RARUL grant) in the physical layer. In other words, the terminal device 1 can specify the RAR message (MAC RAR) dedicated to the terminal device itself from BS 3 by monitoring the random access response (contained in Msg2 902) corresponding to the random access preamble identifier.

[0181] In the case where the terminal device 1 does not detect the DCI format 1_0 with the CRC encrypted with RA-RNTI added within the window time period, or (ii) the terminal device 1 does not properly receive the DL-SCH transport block in the PDSCH within the window time period, or (iii) the higher layer does not identify the RAPID related to the PRACH transmission, the higher layer provides an indication to the physical layer to transmit the PRACH.

[0182] In a case where a random access preamble identifier corresponding to the transmitted random access preamble is included in the received random access response, and the random access preamble has been selected based on the information received by the terminal device 1 from the BS 3, the terminal device 1 considers that the non-contention-based random access procedure has been successfully completed, and transmits the PUSCH based on the uplink grant included in the random access response.

[0183] In the case where a random access preamble identifier corresponding to the transmitted random access preamble is included in the received random access response and the terminal device 1 has selected the random access preamble itself, TC-RNTI is set to the value of the TC-RNTI field included in the received random access response, and random access Msg3 903 is transmitted in PUSCH based on the uplink grant included in the random access response. The PUSCH corresponding to the uplink grant included in the random access response is transmitted in the serving cell in which the corresponding preamble has been transmitted in the PRACH.

[0184] Fig. 9The random access procedure described in is considered as a 4-step random access type, which requires two round trip transmissions between the terminal device 1 and the BS 3. In order to further reduce the delay of the random access procedure, a 2-step random access may be considered.

[0185] For the 2-step random access type, the preamble (Msg1) and scheduled PUSCH transmission (Msg3) defined in the 4-step type are combined into a single message MsgA. The RAR (Msg2) and contention resolution message (Msg4) are combined into a single message MsgB.

[0186] The MsgA PRACH preamble is separate from the 4-step random access preamble, but can be transmitted in the same PRACH opportunity (RO) as the preamble of the 4-step random access type or in a separate RO. PUSCH transmissions are organized into PUSCH opportunities (POs) spanning multiple symbols and PRBs, with optional guard periods and guard bands between consecutive POs. Each PO consists of multiple DMRS ports and DMRS sequences, and each DMRS port / DMRS sequence pair is called a PUSCH resource unit (PRU). The 2-step random access type supports at least one-to-one and many-to-one mapping between preambles and PRUs.

[0187] Fig.10 is a diagram showing an example of allocation of SSB indexes to PRACH opportunities according to an embodiment of the present invention. Fig.10 An example is shown in which there are two PRACH slots in a certain time period, two PRACH opportunities (RO) in the time direction and two PRACH opportunities (RO) in the frequency direction in one PRACH slot, and there are SSB indexes from 0 to 11. Two SSB indexes are mapped to one PRACH opportunity, the SSB indexes are mapped according to the aforementioned rules (1) to (4), and the SSB indexes are mapped again from the seventh PRACH opportunity starting from SSB index 0.

[0188] In the case where the SSB index is mapped to each PRACH opportunity, but all SSB indexes (all SS / PBCH blocks transmitted by BS 3) are not mapped even when all PRACH opportunities in the PRACH configuration period specified by prach-ConfigIndex are used, the SSB index may be mapped within multiple PRACH configuration periods. However, the total number of SS / PBCH blocks transmitted by BS 3 may be indicated by a high-level parameter. The period in which the PRACH configuration period is repeated a predetermined number of times so that all SSB indexes are mapped at least once will be referred to as an association period. Due to the number of times the PRACH configuration period of the configuration association period is repeated, the minimum value that satisfies the conditions as described above in a predefined set of multiple values ​​may be used. A predefined set of multiple values ​​may be defined for each PRACH configuration period. However, in the case where all SSB indexes are mapped to PRACH opportunities in the association period and the number of remaining PRACH opportunities is greater than the number of SS / PBCH blocks, the SSB index may be mapped again. However, in the case where all SSB indexes are mapped to PRACH opportunities in the association period and the number of remaining PRACH opportunities is less than the number of SS / PBCH blocks, the SSB index cannot be mapped to the remaining PRACH opportunities. The period in which the PRACH opportunities are allocated to all SSB indexes at once will be referred to as the SSB index allocation period. When SSB-perRACH-Occasion is equal to or greater than 1, each SSB index in the SSB index is mapped to a PRACH opportunity in one SSB index allocation period. When SSB-perRACH-Occasion is a value less than 1, each SSB index is mapped to 1 / SSB-perRACH-Occasion PRACH opportunities in one SSB index allocation period. The terminal device 1 may specify the association period based on the PRACH configuration period indicated by the PRACH configuration index and the number of SS / PBCH blocks specified by the high-level parameters provided by the high-level (high-level signal).

[0189] Each random access preamble group of one or more random access preamble groups included in the random access configuration information may be associated with each reference signal (e.g., SS / PBCH block, CSI-RS, or downlink transmit beam). The terminal device 1 may select a random access preamble group based on the received reference signal (e.g., SS / PBCH block, CSI-RS, or downlink transmit beam).

[0190] However, the random access preamble group associated with each SS / PBCH block may be specified by one or more parameters notified from a higher layer. The one parameter or one of the multiple parameters may be an index (e.g., a starting index) of one or more available preambles. The one parameter or the one of the multiple parameters may be the number of preambles available for contention-based random access for each SS / PBCH block. The one parameter or the one of the multiple parameters may be the sum of the number of preambles available for contention-based random access for each SS / PBCH block and the number of preambles available for non-contention-based random access. The one parameter or the one of the multiple parameters may be the number of SS / PBCH blocks associated with one PRACH opportunity.

[0191] However, the terminal device 1 may receive one or more downlink signals (each of which is transmitted using a downlink transmit beam), receive random access configuration information associated with one of the downlink signals, and perform a random access procedure based on the received random access configuration information. The terminal device 1 may receive one or more SS / PBCH blocks in an SS burst set, receive random access configuration information associated with one of the SS / PBCH blocks, and perform a random access procedure based on the received random access configuration information. The terminal device 1 may receive one or more CRI-RSs, receive random access configuration information associated with one of the CRI-RSs, and perform a random access procedure based on the received random access configuration information. The random access configuration information may be included in the system information transmitted by BS 3 to the terminal device 1.

[0192] The one or more random access configuration information may include a random access channel configuration (RACH-Config) and / or a physical random access channel configuration (PRACH-Config).

[0193] Parameters related to random access for each reference signal may be included in the random access channel configuration.

[0194] Parameters related to a physical random access channel for each reference signal, such as an index of a PRACH configuration, a PRACH opportunity, etc., may be included in the physical random access channel configuration.

[0195] One piece of random access configuration information may indicate parameters related to random access corresponding to one reference signal, and multiple pieces of random access configuration information may indicate parameters related to multiple random accesses corresponding to multiple reference signals.

[0196] One piece of random access configuration information may indicate parameters related to physical random access corresponding to one reference signal, and may indicate parameters related to multiple random accesses corresponding to multiple reference signals.

[0197] Random access configuration information corresponding to the reference signal (random access channel configuration corresponding to the reference signal, physical random access channel configuration corresponding to the reference signal) may be selected in response to selection of the corresponding reference signal.

[0198] However, the terminal device 1 may receive one or more random access configuration information from the BS 3 that transmits the random access preamble and / or a BS 3 different from the transmit-receive point 4 and / or the transmit-receive point 4. For example, the terminal device 1 may transmit the random access preamble to the second BS 3 based on at least one random access configuration information received from the first BS 3.

[0199] However, BS 3 can determine the downlink transmission beam to be applied when transmitting a downlink signal to terminal device 1 by receiving a random access preamble transmitted by terminal device 1. Terminal device 1 can transmit the random access preamble using a PRACH opportunity indicated by random access configuration information associated with a specific downlink transmission beam. BS3 can determine the downlink transmission beam to be applied when transmitting a downlink signal to terminal device 1 based on the random access preamble received from terminal device 1 and / or the PRACH opportunity at which the random access preamble is received.

[0200] BS 3 transmits RRC parameters including one or more pieces of random access configuration information (which may include random access resources) to terminal device 1 as an RRC message.

[0201] The terminal device 1 may select one or more available random access preambles and / or one or more available PRACH opportunities for a random access procedure based on properties of a transmission path with the BS 3 .

[0202] The terminal device 1 may select one or more random access preambles and / or one or more PRACH opportunities for a random access process based on properties of a transmission path (e.g., which may be RSRP) measured by a reference signal (e.g., SS / PBCH block and / or CSI-RS) received from the BS 3.

[0203] For uplink coverage enhancement, PRACH is one of the bottleneck channels. If the same uplink transmit beam is used for repetition, multiple PRACH transmissions before the RAR window can provide a clear joint decoding gain.

[0204] Fig.11is a diagram showing an example of PRACH repetition using multiple PRACH opportunities. Fig.11 In the example, 4 FDMedPRACH opportunities (ROs) are allocated 4 time resources with 2 PRACH slots, and there are 16 ROs in total. Each RO is associated with one of SSB0-SSB3. When terminal device 1 transmits PRACH associated with SSB1 4 times repeatedly, PRACH with a PRACH format using a preamble is allocated to RO 1101, RO 1102, RO 1103, RO 1104 for transmission 4 times.

[0205] The multiple PRACH opportunities and / or PRACH preambles available for PRACH repetition may be specified by higher layer parameters included in the RACH configuration information.

[0206] Fig.12 is an example of a PrachRepetitionPreambles for a higher layer parameter for identifying a set of PRACH preambles and PRACH opportunities that can be used for PRACH repetition. PrachRepetitionPreambles may include numberOfRepetitionForPrachRepetition, startPreambleForPrachRepetition, numberOfPreamblesPerSSB-ForPrachRepetition, and ssb-SharedRO-MaskIndexForPrachRepetition. If necessary, other parameters may be included in PrachRepetitionPreambles.

[0207] numberOfRepetitionForPrachRepetition is a parameter that determines how many ROs are used for PRACH repetition.

[0208] roIntervalForPrachRepetition is a parameter that defines the interval of ROs used for PRACH repetition. When multiple ROs are associated to an SSB, roIntervalForPrachRepetition indicates the interval of ROs used for PRACH repetition within the multiple ROs. When roIntervalForPrachRepetition is 1, all ROs associated with the SSB can be used for PRACH repetition.

[0209] startPreambleForPrachRepetition is a parameter that defines the first preamble associated with a PRACH repetition. If N<1, the first preamble in each PRACH opportunity is the preamble with the same index indicated by this field. If N≥1, in each PRACH opportunity, N preamble blocks associated with a PRACH repetition are defined, each preamble block having a starting index n*N ^ total_preamble / N+startPreambleForPrachRepetition, where N refers to the number of SSB block indices associated with one PRACH opportunity with reference to ssb-perRACH-OccasionAndCB-PreamblesPerSSB, n refers to the SSB block index, and N ^ total_preamble is provided by totalNumberOfRA-Preambles.

[0210] startRoForPrachRepetition is a parameter that defines a first RO associated with PRACH repetition among ROs associated to the SSB.

[0211] numberOfPreamblesPerSSB-ForPrachRepetition is a parameter that determines how many consecutive preambles are associated to the PRACH repetition starting from the starting preamble of each SSB.

[0212] ssb-SharedRO-MaskIndexForPrachRepetition is a parameter indicating a subset of ROs in which preambles are allocated for PRACH repetition. If this parameter is configured in PrachRepetitionPreambles included in RACH-ConfigCommonTwoStepRA, this parameter indicates a subset of ROs configured in this RACH-ConfigCommonTwoStepRA. This parameter is configured when there is more than one RO per SSB. If this field does not exist, all ROs configured in RACH-ConfigCommon or RACH-ConfigCommonTwoStepRA containing PrachRepetitionPreambles are shared.

[0213] Based on the parameters included in PrachRepetitionPreambles, the terminal device 1 determines / identifies the RO and / or preamble partition (ie, preamble set) for PRACH repetition.

[0214] As another example of a higher layer parameter in the RACK configuration information for specifying a plurality of PRACH opportunities and / or PRACH preambles that may be used for PRACH repetition, a parameter for PRACH repetition may be included in a higher layer parameter FeatureCombinationPreambles.

[0215] Fig.13 is an example of FeatureCombinationPreambles that associates a set of preambles with a feature combination. FeatureCombinationPreambles may include featureCombination, startPreambleForThisPartition, numberOfPreamblesPerSSB-ForThisPartition, ssb-SharedRO-MaskIndex, startPreambleForPrachRepetition, numberOfRepetitionForPrachRepetition, roIntervalForPrachRepetition, startRoForPrachRepetition, numberOfPreamblesPerSSB-ForPrachRepetition, and ssb-SharedRO-MaskIndexForPrachRepetition.

[0216] featureCombination is a parameter indicating which feature combination is associated with the preamble indicated by this parameter. If any feature within featureCombination is not supported by the UE or has an unknown value, the terminal device 1 ignores the RACH resources defined by this FeatureCombinationPreambles.

[0217] If msg3-Repetitions is present in featureCombination, this parameter indicates that the signaling of msg3 repetitions is part of this feature combination.

[0218] If prach-Repetitions is present in featureCombination, this parameter indicates that the signaling of PRACH repetitions is part of this feature combination.

[0219] startPreambleForThisPartition is a parameter that defines the first preamble associated with the feature combination.

[0220] numberOfPreamblesPerSSB-ForThisPartition is a parameter that determines how many consecutive preambles are associated to the signature combination starting from the starting preamble of each SSB.

[0221] ssb-SharedRO-MaskIndex is a parameter indicating a subset of ROs in which preambles are allocated for this feature combination.

[0222] When a feature combination is associated with PRACH repetitions, startPreambleForPrachRepetition, numberOfRepetitionForPrachRepetition, roIntervalForPrachRepetition, startRoForPrachRepetition, numberOfPreamblesPerSSB-ForPrachRepetition, and ssb-SharedRO-MaskIndexForPrachRepetition may be provided in FeatureCombinationPreambles. These parameters are the same functions as those in PrachRepetitionPreambles.

[0223] When FeatureCombinationPreambles is associated with both Msg3 repetition and PRACH repetition, this parameter specifies the subset of preambles used for PRACH repetition within the preamble partition. For example, a parameter indicating the boundary of the PRACH preamble index is provided in FeatureCombinationPreambles, which specifies whether the preamble can be used for both PRACH repetition and Msg3 repetition cases or only for Msg3 repetition cases.

[0224] Fig.14 An example of a method for a terminal device 1 is shown. The method may include receiving system information including random access channel (RACH) configuration information, the RACH configuration information including a parameter set specifying a preamble partition and a RACH opportunity associated with a PRACH repetition (step 1001). The parameter set may include a first parameter defining a first preamble associated with a PRACH repetition, a second parameter defining how many consecutive preambles are associated with a PRACH repetition, and a third parameter defining the number of RACE opportunities for a PRACH repetition. The method may also include applying the parameter set when performing a PRACH repetition (step S1002).

[0225] Fig.15An example of a method for a base station device 3 is shown. The method may include setting random access channel (RACE) configuration information including a parameter set specifying a preamble partition and RACH opportunity associated to a physical random access channel (PRACH) repetition as system information (step 2001). The method may also include transmitting the system information to a terminal device 1 (step S2002).

[0226] Each of the programs running on the base station device and the terminal device according to aspects of the present invention can be a program for controlling a central processing unit (CPU) or the like, so that the program causes the computer to operate in a manner that realizes the functions according to the above-mentioned embodiments of the present invention. The information processed in these devices is temporarily stored in a random access memory (RAM) while being processed. Thereafter, the information is stored in various types of read-only memories (ROMs) such as flash ROMs and hard disk drives (HDDs), and is read by the CPU to be modified or rewritten when necessary.

[0227] Note that the terminal device 1 and the base station device 3 according to the above-described embodiment may be partially implemented by a computer. In this case, the configuration may be implemented by recording a program for implementing 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.

[0228] Note that it is assumed that the "computer system" mentioned here refers to a computer system built into the terminal device 1 or the base station device 3, and the computer system includes an OS and hardware components such as peripheral devices. In addition, "computer-readable recording medium" refers to portable media such as floppy disks, magneto-optical disks, ROMs, CD-ROMs, etc., and storage devices such as hard disks built into the computer system.

[0229] In addition, the "computer-readable recording medium" may include a medium that dynamically retains the program for a short period of time, such as a communication line for transmitting the program through a network (such as the Internet) or through a communication line (such as a telephone line), and may also include a medium that retains the program for a fixed period of time, such as a volatile memory within a computer system, in which case the computer system operates as a server or client. In addition, the program may be configured to implement some of the above functions, and may also be configured to be able to implement the above functions in combination with a program already recorded in the computer system.

[0230] In addition, the base station device 3 according to the above embodiment can be implemented as an aggregation (device group) including multiple devices. Each device configuring such a device group may include some or all functions or functional blocks of the base station device 3 according to the above embodiment. The device group may include each common function or each functional block of the base station device 3. In addition, the terminal device 1 according to the above embodiment can also communicate with the base station device as an aggregation.

[0231] In addition, the base station device 3 according to the above embodiment can be used as an evolved universal terrestrial radio access network (E-UTRAN) and / or NG-RAN (next generation RAN, NR-RAN). In addition, the base station device 3 according to the above embodiment may have some or all functions of a node higher than an eNodeB or a gNB.

[0232] In addition, some or all of the parts of each of the terminal device 1 and the base station device 3 according to the above-mentioned embodiment can be generally implemented as an LSI (which is an integrated circuit) or can be implemented as a chipset. The functional blocks of each of the terminal device 1 and the base station device 3 can be implemented as a chip alone, or some or all of the functional blocks can be integrated into the chip. In addition, the circuit integration technology is not limited to LSI, and can be implemented using a dedicated circuit or a general-purpose processor. In addition, in the case where a circuit integration technology that replaces LSI appears with the advancement of semiconductor technology, an integrated circuit based on the technology can also be used.

[0233] In addition, according to the above-mentioned embodiments, the terminal device has been described as an example of a communication device, but the present invention is not limited to such terminal devices and is applicable to terminal devices or communication devices of fixed or stationary electronic devices installed indoors or outdoors, such as audio and video (AV) equipment, kitchen equipment, cleaning machines or washing machines, air conditioning equipment, office equipment, vending machines and other household equipment.

[0234] In addition, according to the above embodiments, the words / parameters described in italics may be RRC parameters, higher layer parameters, PC5-RRC parameters and / or preconfigured parameters.

[0235] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the specific configuration is not limited to these embodiments and includes, for example, modifications to the design that fall within the scope of the gist of the present invention. In addition, within the scope of one aspect of the present invention defined by the claims, various modifications are possible, and embodiments obtained by appropriately combining the technical means disclosed according to different embodiments are also included in the technical scope of the present invention. In addition, configurations in which constituent elements described in the corresponding embodiments and having the same effects as each other are replaced with each other are also included in the technical scope of the present invention.

Claims

1. A user equipment (UE), the UE comprising: A receiving circuit configured to receive system information including random access channel (RACH) configuration information, wherein The RACH configuration information includes a set of parameters specifying preamble partitioning and RACH opportunities associated with a physical random access channel (PRACH) with repetition, wherein The parameter set includes a first parameter specifying a starting preamble of the preamble partition, a second parameter specifying how many consecutive preambles are associated to the preamble partition, and a third parameter specifying the number of PRACH repetitions; and a control circuit configured to apply the parameter set when performing random access.

2. The UE according to claim 1: wherein The parameter set also includes a fourth parameter indicating a subset of RACH occasions in which preambles are allocated for the PRACH with repetitions.

3. The UE according to claim 1: The parameter set also includes a fifth parameter indicating a time interval for a RACH occasion with the repeated PRACH.

4. A base station, comprising: a control circuit configured to set, as system information, random access channel (RACK) configuration information including a set of parameters specifying a preamble partition and a RACH opportunity associated to a physical random access channel (PRACH) with repetitions, wherein the set of parameters includes a first parameter specifying a starting preamble of the preamble partition, a second parameter specifying how many consecutive preambles are associated to the preamble partition, and a third parameter specifying the number of PRACH repetitions; and a transmitting circuit configured to transmit the system information to a terminal device.

5. The base station according to claim 4: The parameter set also includes a fourth parameter indicating a subset of RACH occasions in which preambles are allocated for the PRACH with repetitions.

6. The base station according to claim 4: The parameter set also includes a fifth parameter indicating a time interval for a RACH occasion with the repeated PRACH.

7. A method for a base station, the method comprising: RACH configuration information including a parameter set specifying a preamble partition and a random access channel (RACH) opportunity associated with a physical random access channel (PRACH) with repetition is set as system information, wherein The parameter set includes a first parameter specifying the first preamble associated to the preamble partition, a second parameter specifying how many consecutive preambles are associated to the preamble partition, and a third parameter specifying the number of PRACH repetitions; as well as The system information is transmitted to a terminal device.

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