Terminal device, base station device, and communication method

Abstract

To provide a terminal device that efficiently communicates with a serving cell consisting of multiple TRPs (Transmission Reception Points or Transmit / Receive Points).SOLUTION: A terminal device includes a radio resource control layer processing unit that sets a first time synchronization timer and a second time synchronization timer for one serving cell, and a medium access control layer processing unit. Based at least on receiving a first TA command, the medium access control layer processing unit starts or restarts the first time synchronization timer, and based at least on receiving a second TA command, starts or restarts the second time synchronization timer. When the first time synchronization timer or the second time synchronization timer expires, the medium access control layer processing unit flashes all HARQ buffers for one serving cell.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a terminal device, a base station device, and a communication method. [Background technology]

[0002] The radio access method and radio network for cellular mobile communications (hereinafter referred to as "Long Term Evolution (LTE)" or "EUTRA: Evolved Universal Terrestrial Radio Access") is being developed by the Third Generation Partnership Project (3GPP: 3 rd The LTE standard is being considered in the LTE Generation Partnership Project. In LTE, a base station device is also called eNodeB (evolved NodeB), and a terminal device is also called UE (User Equipment). LTE is a cellular communication system in which areas covered by base station devices are arranged in multiple cell shapes. A single base station device may manage multiple serving cells.

[0003] 3GPP is currently studying the next-generation standard (NR: New Radio) to propose it for IMT (International Mobile Telecommunication)-2020, a standard for next-generation mobile communication systems formulated by the International Telecommunication Union (ITU) (Non-Patent Document 1). NR is a standard that combines eMBB (enhanced Mobile Broadband) and It is required to meet requirements assuming three scenarios: mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication).

[0004] 3GPP is currently considering the expansion of services supported by NR (non- Patent document 2). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "New SID proposal: Study on New Radio Access Technology", RP-160671, NTT docomo, 3GPP TSG RAN Meeting #71, Goteborg, Sweden, 7th - 10th March, 2016. [Non-Patent Document 2] “Release 17 package for RAN”, RP-193216, RAN chairman, RAN1 chairman, RAN2 chairman, RAN3 chairman, 3GPP TSG RAN Meeting #86, Sitges, Spain, 9th ― 12th December, 2019 [Non-Patent Document 3] “Release 18 package summary”, RP-213469, RAN chairman, RAN1 chairman, RAN2 chairman, RAN3 chairman, 3GPP TSG RAN Meeting #94-e, 6th ― 17th December, 2021 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a terminal device that performs efficient communication, a communication method used in the terminal device, a base station device that performs efficient communication, and a communication method used in the base station device. [Means for solving the problem]

[0007] (1) A first aspect of the present invention is a terminal device comprising: a transmitter that transmits a first random access preamble in a first random access and transmits a second random access preamble in a second random access; and a receiver that receives a first TA command in the first random access and receives a second TA command in the second random access, wherein a first uplink timing is adjusted in one serving cell based on at least the first TA command, and a first uplink timing is adjusted in one serving cell based on at least the second TA command. Also, a second uplink timing is adjusted in the one serving cell based on the Then, based on certain information, one of the first uplink timing and the second uplink timing is used.

[0008] (2) Also, a second aspect of the present invention is a base station device comprising: a receiving unit that receives a first random access preamble in a first random access and receives a second random access preamble in a second random access; and a transmitting unit that transmits a first TA command in the first random access and transmits a second TA command in the second random access, wherein a first uplink timing is adjusted in one serving cell based on at least the first TA command, and the second TA command is A second uplink timing is determined in the one serving cell based at least on and based on certain information, one of the first uplink timing and the second uplink timing is used.

[0009] (3) Also, a third aspect of the present invention is a communication method used in a terminal device, comprising the steps of transmitting a first random access preamble in a first random access and transmitting a second random access preamble in a second random access, receiving a first TA command in the first random access and receiving a second TA command in the second random access, and a first uplink timing is adjusted in one serving cell based on at least the first TA command. A second uplink timing is determined based on at least the second TA command. and based on certain information, one of the first uplink timing and the second uplink timing is used.

[0010] (4) Also, a fourth aspect of the present invention is a communication method used in a base station device, comprising the steps of receiving a first random access preamble in a first random access and receiving a second random access preamble in a second random access, transmitting a first TA command in the first random access and transmitting a second TA command in the second random access, and wherein a first uplink timing is adjusted in one serving cell based on at least the first TA command. and determining a second uplink timing based at least on the second TA command. The timing is coordinated between two serving cells, and one of the first uplink timing and the second uplink timing is used based on certain information.

[0011] (5) A fifth aspect of the present invention is a terminal device, and a radio resource control layer processing unit configured to set a first time synchronization timer and a second time synchronization timer, and a medium access control layer processing unit, wherein, based at least on a first TA command being received, the medium access control layer processing unit starts or restarts the first time synchronization timer, based at least on a second TA command being received, the medium access control layer processing unit starts or restarts the second time synchronization timer, and when the first time synchronization timer or the second time synchronization timer expires, the medium access control layer processing unit clears all HARQ buffers for the one serving cell. Flash.

[0012] (6) Moreover, a sixth aspect of the present invention is a base station device, and a radio resource control layer processing unit that sets a first time synchronization timer and a second time synchronization timer to synchronize the first and second TA commands, and wherein the media access control layer processing unit starts or restarts the first time synchronization timer based at least on a first TA command being received, and the media access control layer processing unit starts or restarts the second time synchronization timer based at least on a second TA command being received; When the first time synchronization timer or the second time synchronization timer expires, the medium access control layer processing unit resets all HARQ buffers for the one serving cell. Flush the buffer.

[0013] (7) A seventh aspect of the present invention is a communication method for use in a terminal device, comprising: a radio resource control layer processing unit for controlling a first time synchronization timer for one serving cell; The method includes a first step of setting a second time synchronization timer and a second step in a media access control layer processing unit, wherein in the first step, based at least on receiving a first TA command, the media access control layer processing unit starts or restarts the first time synchronization timer, and in the first step, based at least on receiving a second TA command, the media access control layer processing unit starts or restarts the second time synchronization timer, and in the first step, if the first time synchronization timer or the second time synchronization timer expires, the media access control layer processing unit flushes all HARQ buffers for the one serving cell.

[0014] (8) Moreover, an eighth aspect of the present invention is a communication method used in a base station device, comprising: a radio resource control layer processing unit that controls a first time synchronization timer for one serving cell. and a second step in a media access control layer processing unit, wherein in the first step, based at least on receiving a first TA command, the media access control layer processing unit starts or restarts the first time synchronization timer, based at least on receiving a second TA command, in the first step, the media access control layer processing unit starts or restarts the second time synchronization timer, and in the first step, when the first time synchronization timer or the second time synchronization timer expires, the media access control layer processing unit flushes all HARQ buffers for the one serving cell. . Effect of the Invention

[0015] According to the present invention, the terminal device can perform communication efficiently, and the base station device can perform communication efficiently. [Brief description of the drawings]

[0016] [Figure 1] 1 is a conceptual diagram of a wireless communication system according to an embodiment of the present invention. [Diagram 2] 1 is an example showing a relationship between a subcarrier spacing setting μ, the number of OFDM symbols per slot Nslot symb, and a cyclic prefix (CP) setting according to an aspect of the present embodiment. [Diagram 3] FIG. 2 is a diagram illustrating an example of a method for configuring a resource grid according to an aspect of the present embodiment. [Figure 4] FIG. 3 is a diagram illustrating an example of the configuration of a resource grid 3001 according to an aspect of the present embodiment. [Diagram 5] 2 is a schematic block diagram illustrating a configuration example of a base station device 3 according to an aspect of the present embodiment. FIG. [Figure 6] 1 is a schematic block diagram showing an example of the configuration of a terminal device 1 according to an aspect of the present embodiment. [Figure 7] FIG. 2 is a diagram illustrating an example of the configuration of an SS / PBCH block according to one embodiment of the present invention. [Figure 8] A diagram showing an example of a monitoring opportunity for a search area set according to one aspect of this embodiment. [Figure 9] FIG. 2 is a diagram showing an example of two uplink channel transmissions in one serving cell according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described.

[0018] floor(C) may be a floor function for real number C. For example, floor(C) may be a function that outputs the largest integer that does not exceed real number C. ceil(D) may be a ceiling function for real number D. For example, ceil(D) may be a function that outputs the smallest integer that does not fall below real number D. mod(E,F) is a function that outputs the remainder when E is divided by F. mod(E,F) is a function that outputs the value corresponding to the remainder when E is divided by F. exp(G)=e^G, where e is Napier's constant. H^I is H to the Ith power. max(J,K) is a function that outputs the maximum value among J and K. Here, if J and K are equal, max(J,K) is a function that outputs J or K. min(L,M) is a function that outputs the maximum value among L and M. Here, if L and M are equal, min(L,M) is a function that outputs L or M. round(N) is a function that outputs the integer value closest to N. "·" indicates multiplication.

[0019] In the wireless communication system according to the embodiment, at least OFDM (Orthogonal Frequency Division Multiplex) is used. An OFDM symbol is a unit of time domain of OFDM. An OFDM symbol includes at least one or more subcarriers. The 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 Multiplex) is used. In the uplink, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform - spread - Orthogonal Frequency Division Multiplex) is used. DFT-s-OFDM may be obtained by applying transform precoding to CP-OFDM.

[0020] The OFDM symbol may be a name including a CP added to the OFDM symbol, that is, a certain OFDM symbol may be configured to include the certain OFDM symbol and a CP added to the certain OFDM symbol.

[0021] Fig. 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. In Fig. 1, the wireless communication system includes at least terminal devices 1A to 1C and a base station device 3 (BS#3: Base station#3). Hereinafter, the terminal devices 1A to 1C are also referred to as terminal device 1 (UE#1: User Equipment#1).

[0022] The base station device 3 may be configured to include one or more transmission devices (or transmission points, transmission / reception devices, transmission / reception points). When the base station device 3 is configured with multiple transmission devices, each of the multiple transmission devices may be located at a different position. For example, the base station device 3 is For example, the base station device 3 may be configured with a transmission / reception point 3a and a transmission device 3b. For example, the base station device 3 may be configured with a transmission / reception point 3a and a transmission / reception point 3b. It may be composed of:

[0023] The base station device 3 may provide one or more serving cells. The serving cell may be defined as a set of resources used for wireless communication. The serving cell may also be called a cell.

[0024] A serving cell may be configured to include one downlink component carrier (downlink carrier) and / or one uplink component carrier (uplink carrier). A serving cell may be configured to include two or more downlink component carriers and / or two or more uplink component carriers. Downlink component carriers and uplink component carriers are also collectively referred to as component carriers (carriers).

[0025] For example, one resource grid may be provided for each component carrier. Also, one resource grid may be provided for each set of one component carrier and a certain subcarrier spacing configuration μ, where the subcarrier spacing configuration μ is also referred to as numerology. For example, one resource grid may be provided for a set of an antenna port p, a certain subcarrier spacing configuration μ, and a certain transmission direction x.

[0026] The resource grid is size,μ grid,x N RB sc where The base grid is composed of common resource blocks N start,μ grid,x It starts from. Also, Resource Block N start,μ grid,x is also referred to as the reference point of the resource grid.

[0027] The resource grid is subframe,μ symb It contains OFDM symbols.

[0028] The subscript x, which is added to the resource grid related parameters, specifies the sending direction. For example, the subscript x indicates either the downlink or the uplink. It may also be used for

[0029] N size,μ grid,x is indicated by parameters provided by the RRC layer (e.g., N start,μ grid,x is the bandwidth setting indicated by parameters provided by the RRC layer (e.g., parameter OffsetToCarrier). The offset and band settings are the configuration of the SCS-specific carrier. This is the setting used for.

[0030] Subcarrier spacing (SCS) for a certain subcarrier spacing setting μ )Δf is Δf=2 μ 15 kHz. Here, the subcarrier spacing setting μ is 0 , 1, 2, 3, or 4.

[0031] FIG. 2 shows a subcarrier interval setting μ and the number of OFDM symbols per slot N according to one embodiment of the present invention. slot symb 2A is an example showing the relationship between the subcarrier interval setting μ and the CP setting of normal cyclic prefix (CP). slot symb =14, N frame,μ slot =40, N subframe, μ slot In FIG. 2B, for example, the subcarrier spacing setting μ is 2. If the CP setting is an extended cyclic prefix, N slot symb =12, N frame ,μ slot =40, N subframe,μ slot =4.

[0032] Time unit T c may be used to express a length in the time domain. c is T c =1 / (Δf max N f ) Δf max= 480kHz. f =409 6. The constant κ is κ=Δf max N f / (Δf ref N f,ref ) = 64. Δf ref is 1 It is 5kHz. f,ref is 2048.

[0033] The transmission of the signal in the downlink and / or the transmission of the signal in the uplink may be of length T f The radio frames (system frames, frames) may be organized into T f =(Δf max N f / 100)·T s = 10 ms. A radio frame is made up of 10 subframes. The length of a subframe is T sf =(Δf max N f / 1000)·T s = 1 ms. The number of OFDM symbols per subframe is N subframe,μ symb =N slot symb N subframe,μ slot It is.

[0034] In one carrier, there is a first set of one or more frames in the uplink and a second set of one or more frames in the downlink. The uplink frame for the transmission of TA Start from the front It will be done. TA is (N TA N TA,offset )T c may be also possible.

[0035] An OFDM symbol is a unit of time domain for one communication method. For example, an OFDM symbol may be a unit of time domain for CP-OFDM. Also, an OFDM symbol may be a unit of time domain for DFT-s-OFDM.

[0036] A slot may consist of multiple OFDM symbols. For example, N consecutive slot symb One slot may be composed of N OFDM symbols. For example, in the normal CP setting, slot symb In addition, in the setting of the extended CP, N slot symb =12.

[0037] For a given subcarrier spacing setting μ, the number and index of slots contained in a subframe may be given. For example, slot index n μ s ranges from 0 to N in the subframe. subframe,μ slot The subcharacters may be given in ascending order in the range -1 to +1. For the purpose of setting the rear interval μ, the number and index of slots included in the radio frame may be given. Also, the slot index n μ s,f ranges from 0 to N in the radio frame. frame,μ slot Integer values ​​in the range -1 through increasing order may be given.

[0038] 3 is a diagram showing an example of a method for configuring a resource grid according to an aspect of the present embodiment. The horizontal axis of FIG. 3 indicates the frequency domain. In FIG. 3, the subcarrier spacing μ 1 A configuration example of a resource grid of the above and a subcarrier spacing μ 2 In this way, one or more subcarrier spacings may be set for a certain component carrier. 1 =μ2 -1, but various aspects of the present embodiment 1 =μ 2 Not limited to the condition -1.

[0039] The component carrier 300 is a band having a predetermined width in the frequency domain.

[0040] The point 3000 is an identifier for identifying a certain subcarrier. The point 3000 is also called point A. The common resource block (CRB) set 3100 is a set of subcarrier spacing μ 1 is a set of common resource blocks for

[0041] In the common resource block set 3100, the common resource block including the point 3000 (a black block in the common resource block set 3100 in FIG. 3) is also called the reference point of the common resource block set 3100. The reference point of the common resource block set 3100 may be the common resource block with index 0 in the common resource block set 3100.

[0042] The offset 3011 is an offset from the reference point of the common resource block set 3100 to the reference point of the resource grid 3001. The offset 3011 is determined by the subcarrier spacing setting μ 1 The resource grid 3001 is represented by the number of common resource blocks for N size,μ grid1,x It contains common resource blocks.

[0043] The offset 3013 is the distance from the reference point of the resource grid 3001 to the reference point (N start,μ BWP,i1 )

[0044] The common resource block set 3200 is a set of subcarrier spacing μ 2 is a set of common resource blocks for

[0045] In the common resource block set 3200, the common resource block including the point 3000 (a black block in the common resource block set 3200 in FIG. 3 ) is also referred to as the reference point of the common resource block set 3200. The reference point of the common resource block set 3200 may be the common resource block with index 0 in the common resource block set 3200.

[0046] The offset 3012 is an offset from the reference point of the common resource block set 3200 to the reference point of the resource grid 3002. The offset 3012 is determined by the subcarrier spacing μ 2 The resource grid 3002 is represented by the number of common resource blocks relative to the N size,μ grid2,x It contains common resource blocks.

[0047] The offset 3014 is the distance from the reference point of the resource grid 3002 to the reference point of the BWP 3004 with index i2 (N start,μ BWP,i2 )

[0048] 4 is a diagram showing an example of the configuration of a resource grid 3001 according to one aspect of this embodiment. In the resource grid of FIG. 4, the horizontal axis represents the OFDM symbol index l sym and the vertical axis is the subcarrier index k sc The resource grid 3001 is size,μ grid1,x N RB sc It contains N subcarriers. subframe,μ symb Contains OFDM symbols. Within the grid, subcarrier index k sc and OFDM symbol index l sym The resource specified by is also called a resource element (RE).

[0049] A resource block (RB) is N RB sc Contains consecutive subcarriers Resource blocks are classified into common resource blocks, physical resource blocks (PRBs), and virtual resource blocks (VRBs). Here, N RB sc =12.

[0050] A resource block unit is a set of resources corresponding to one OFDM symbol in one resource block, i.e., one resource block unit includes 12 resource elements corresponding to one OFDM symbol in one resource block.

[0051] The common resource blocks for a given subcarrier spacing setting μ are indexed in a given common resource block set in the frequency domain starting from 0 in ascending order. The common resource block with index 0 for a given subcarrier spacing setting μ contains (or collides with, or coincides with) point 3000. The index n of the common resource block for a given subcarrier spacing setting μ μ CRB is n μ CRB =ceil(k sc / N RB sc ) relationship is satisfied. Here, k sc A subcarrier with a center frequency of 0 is a subcarrier having the same center frequency as the subcarrier corresponding to point 3000.

[0052] The physical resource block for a certain subcarrier spacing setting μ is given as follows for a certain BWP: The indexes are assigned in ascending order starting from 0 in the frequency domain. The index n of the physical resource block for a certain subcarrier spacing setting μ μ PRB is n μ CRB =n μ PRB +N start,μ BWP,i Here, N start,μ BWP,i denotes the reference point of the BWP with index i.

[0053] A BWP is defined as a subset of common resource blocks contained in a resource grid. The BWP is set at the reference point N of the BWP. start,μ BWP,i Starting with N size,μ BWP,i Common lithography The BWP configured for the downlink carrier is also called downlink BWP. The BWP configured for the uplink component carrier is also called uplink BWP.

[0054] An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. For example, the channel may correspond to a physical channel, and the symbol may correspond to an OFDM symbol, and the symbol may correspond to a resource block unit, and the symbol may correspond to a resource element.

[0055] When the large scale properties of a channel through which a symbol is transmitted at one antenna port can be estimated from the channel through which a symbol is transmitted at another antenna port, the two antenna ports are said to be Quasi Co-Located (QCL). Here, the large scale properties may include at least long-range properties of the channel. The large scale properties may include at least some or all of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters. The first antenna port and the second antenna port being QCL with respect to beam parameters may mean that a receiving beam assumed by the receiving side for the first antenna port is the same (or corresponds) as a receiving beam assumed by the receiving side for the second antenna port. The first antenna port and the second antenna port being QCLs in terms of beam parameters may mean that a transmission beam assumed by the receiving side for the first antenna port and a transmission beam assumed by the receiving side for the second antenna port are the same (or correspond to each other). The terminal device 1 may assume that the two antenna ports are QCLs if the large-scale characteristics of a channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at another antenna port. The two antenna ports being QCLs may mean that the two antenna ports are assumed to be QCLs.

[0056] Carrier aggregation is the process of aggregating multiple serving The carrier aggregation may be a communication using a cell. Also, the carrier aggregation may be a communication using a plurality of aggregated component carriers. Also, the carrier aggregation may be a communication using a plurality of aggregated downlink component carriers. Also, the carrier aggregation may be a communication using a plurality of aggregated uplink component carriers.

[0057] Fig. 5 is a schematic block diagram showing a configuration example of a base station device 3 according to one aspect of the present embodiment. As shown in Fig. 5, the base station device 3 includes at least a radio transmission / reception unit (physical layer processing unit) 30 and / or a part or all of a higher layer processing unit 34. The radio transmission / reception unit 30 includes at least an antenna unit 31, an RF (Radio Frequency) unit 32, and a part or all of a baseband unit 33. The higher layer processing unit 34 includes at least a medium access control layer processing unit 35 and a part or all of a radio resource control (RRC) layer processing unit 36.

[0058] The wireless transceiver 30 includes at least a wireless transmitter 30a and a part or whole of a wireless receiver 30b. The device configurations of the baseband units included in wireless transmitting unit 30a and the RF unit included in wireless receiving unit 30b may be the same or different. The device configurations of the RF unit included in wireless transmitting unit 30a and the RF unit included in wireless receiving unit 30b may be the same or different. The device configurations of the antenna unit included in wireless transmitting unit 30a and the antenna unit included in wireless receiving unit 30b may be the same or different.

[0059] For example, the wireless transmitting unit 30a may generate and transmit a baseband signal of a PDSCH. For example, the wireless transmitting unit 30a may generate and transmit a baseband signal of a PDCCH. For example, the wireless transmitting unit 30a may generate and transmit a baseband signal of a PBCH. For example, the wireless transmitting unit 30a may generate and transmit a baseband signal of a synchronization signal. For example, the wireless transmitting unit 30a may generate and transmit a baseband signal of a PDSCH DMRS. For example, the wireless transmitting unit 30a may generate and transmit a baseband signal of a PDCCH DMRS. For example, the wireless transmitting unit 30a may generate and transmit a baseband signal of a CSI-RS. For example, the wireless transmitting unit 30a may generate and transmit a baseband signal of a DL PTRS.

[0060] For example, the wireless receiving unit 30b may receive a PRACH. For example, the wireless receiving unit 30b may receive and demodulate a PUCCH. The wireless receiving unit 30b may receive and demodulate a PUSCH. For example, the wireless receiving unit 30b may receive a PUCCH DMRS. For example, the wireless receiving unit 30b may receive a PUSCH DMRS. For example, the wireless receiving unit 30b may receive a UL PTRS. For example, the wireless receiving unit 30b may receive an SRS.

[0061] The upper layer processing unit 34 outputs the downlink data (transport block) to the radio transceiver unit 30 (or the radio transmitter unit 30a). The upper layer processing unit 34 performs processing of a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and an RRC layer.

[0062] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs processing of the MAC layer. The processing of the MAC layer may be processing of a MAC entity.

[0063] The radio resource control layer processing unit 36 ​​included in the upper layer processing unit 34 performs processing for the RRC layer. The wired resource control layer processing unit 36 ​​processes various setting information / parameters (RRC parameters) of the terminal device 1. The radio resource control layer processing unit 36 ​​manages the RRC message received from the terminal device 1. Set the parameters based on the message.

[0064] The radio transceiver unit 30 (or the radio transmitter unit 30a) performs processes such as modulation and encoding. The radio transceiver 30 (or the radio transmitter 30a) modulates, encodes, and transmits downlink data. The radio transmission / reception unit 30 (or the radio transmission unit 30a) generates a physical signal by generating a baseband signal (converting it into a time-continuous signal) and transmits it to the terminal device 1. Alternatively, the signal may be arranged on a component carrier corresponding to the signal and transmitted to the terminal device 1.

[0065] The wireless transceiver unit 30 (or the wireless receiver unit 30b) performs processes such as demodulation and decoding. The wireless transceiver 30 (or the wireless receiver 30b) separates, demodulates, and The radio transmitting / receiving unit 30 (or the radio receiving unit 30b) may perform a channel access procedure prior to transmitting a physical signal.

[0066] The RF unit 32 converts (down-converts) the signal received via the antenna unit 31 into a baseband signal by quadrature demodulation, and removes unnecessary frequency components. The RF unit 32 outputs the processed analog signal to the baseband unit.

[0067] The baseband unit 33 receives the analog signal from the RF unit 32. The baseband unit 33 converts the converted digital signal into a The part equivalent to the CP (Cyclic Prefix) is removed from the cyclic signal, and the signal after removing the CP is A Fast Fourier Transform (FFT) is performed to extract the frequency domain signal.

[0068] The baseband unit 33 performs an inverse fast Fourier transform (IFFT) on the data to generate an OFDM symbol, adds a CP to the generated OFDM symbol, generates a baseband digital signal, and converts the baseband digital signal into an analog signal. The baseband unit 33 outputs the converted analog signal to the RF unit 32.

[0069] The RF unit 32 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 33, and up-converts the analog signal to a carrier frequency. The RF unit 32 converts the received signal into a digital signal and transmits it via the antenna unit 31. The RF unit 32 may also have a function of controlling transmission power. The RF unit 32 is also referred to as a transmission power control unit.

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

[0071] Each of the serving cells configured for the terminal device 1 is a PCell (Primary cell, An SpCell may be any one of a PCell and a PSCell (Primary Cell), a PSCell (Primary SCG cell), and a SCell (Secondary Cell). An SpCell may be one or both of a PCell and a PSCell.

[0072] The PCell is a serving cell included in a Master Cell Group (MCG). The PCell is a cell in which the terminal device 1 performs an initial connection establishment procedure or a connection re-establishment procedure. (cells where the treatment was performed).

[0073] A PSCell is a serving cell included in a Secondary Cell Group (SCG). , which is the serving cell to which random access is performed by terminal device 1.

[0074] The SCell may be included in either the MCG or the SCG.

[0075] The term "serving cell group" (cell group) refers to at least the MCG and the SCG. The serving cell group may include one or more serving cells (or component carriers). The one or more serving cells (or component carriers) included in the serving cell group may be operated by carrier aggregation.

[0076] One or more downlink BWPs may be configured for each serving cell (or downlink component carrier). One or more uplink BWPs are configured for each component carrier. This is also fine.

[0077] Of one or more downlink BWPs configured for a serving cell (or a downlink component carrier), one downlink BWP is set as an active downlink BWP. may be configured (or one downlink BWP may be activated). Of one or more uplink BWPs configured for a serving cell (or uplink component carrier), one uplink BWP is set as the active uplink BWP. (or one uplink BWP may be activated).

[0078] The PDSCH, the PDCCH, and the CSI-RS may be received in an active downlink BWP. The terminal device 1 may attempt to receive the PDSCH, the PDCCH, and the CSI-RS in an active downlink BWP. The PUCCH and the PUSCH are transmitted in an active uplink BWP. The terminal device 1 may transmit PUCCH and PUSCH in the active uplink BWP. The active downlink BWP and the active uplink BWP are also collectively referred to as active BWP.

[0079] PDSCH, PDCCH, and CSI-RS are transmitted in downlink BWPs other than the active downlink BWP ( The terminal device 1 may not receive the signal in the active downlink BWP. In a downlink BWP that is not an active downlink BWP, the reception of PDSCH, PDCCH, and CSI-RS is PUCCH and PUSCH are not active uplink BWPs and therefore do not need to attempt transmission. The terminal device 1 does not need to transmit the PUCCH and the PUSCH in an uplink BWP that is not an active uplink BWP. Inactive BWPs are collectively referred to as inactive BWPs.

[0080] A downlink BWP switch is a process of switching one active UE in a serving cell. Deactivate the downlink BWP and the in-band of the serving cell. This is a procedure to activate one of the active downlink BWPs. Downlink BWP switching may be controlled by a BWP field included in downlink control information. Downlink BWP switching may also be controlled based on higher layer parameters. good.

[0081] The uplink BWP switching is used to deactivate one active uplink BWP and activate any inactive uplink BWP other than the one active uplink BWP. The uplink BWP switching may be controlled by a BWP field included in the downlink control information. The uplink BWP switching may be controlled based on higher layer parameters.

[0082] Of one or more downlink BWPs configured for a serving cell, two or more The downlink BWP does not have to be set as the active downlink BWP. For a serving cell, one downlink BWP may be active at a given time.

[0083] Of one or more uplink BWPs configured for a serving cell, two or more An uplink BWP does not have to be set as an active uplink BWP. For a serving cell, one uplink BWP may be active at a given time.

[0084] Fig. 6 is a schematic block diagram showing a configuration example of a terminal device 1 according to one aspect of the present embodiment. As shown in Fig. 6, the terminal device 1 includes at least a radio transmission / reception unit (physical layer processing unit) 10 and one or all of an upper layer processing unit 14. The radio transmission / reception unit 10 includes at least an antenna unit 11, an RF unit 12, and some or all of a baseband unit 13. The upper layer processing unit 14 includes at least a medium access control layer processing unit 15 and some or all of a radio resource control layer processing unit 16.

[0085] The wireless transceiver 10 includes at least a wireless transmitter 10a and a part or whole of a wireless receiver 10b. The device configuration of the baseband unit 13 included in 10b may be the same or different. The RF unit 12 included in the wireless transmission unit 10a and the RF unit 12 included in the wireless reception unit 10b may have the same configuration or may have different configurations. The antenna unit 11 and the antenna unit 11 included in the wireless receiving unit 10b have the same device configuration. may be different.

[0086] For example, the radio transmission unit 10a may generate and transmit a baseband signal of a PRACH. For example, the radio transmission unit 10a may generate and transmit a baseband signal of a PUCCH. For example, the radio transmission unit 10a may generate and transmit a baseband signal of a PUSCH. For example, the radio transmission unit 10a may generate and transmit a baseband signal of a PUCCH DMRS. For example, the radio transmission unit 10a may generate and transmit a baseband signal of a PUSCH DMRS. For example, the radio transmission unit 10a may generate and transmit a baseband signal of a UL PTRS. For example, the radio transmission unit 10a may generate and transmit a baseband signal of a UL PTRS. The receiving unit 10a may generate and transmit a baseband signal of the SRS. Generating the signal may include generating an SRS sequence.

[0087] For example, the wireless receiving unit 10b may receive and demodulate a PDSCH. For example, the wireless receiving unit 10b may receive and demodulate a PDCCH. For example, the wireless receiving unit 10b may receive and demodulate a PBCH. For example, the wireless receiving unit 10b may receive a synchronization signal. For example, the wireless receiving unit 10b may receive a PDSCH DMRS. For example, the wireless receiving unit 10b may receive a PDCCH DMRS. For example, the wireless receiving unit 10b may receive a CSI-RS. For example, the wireless receiving unit 10b may receive a DL PTRS.

[0088] The upper layer processing unit 14 outputs the uplink data (transport block) to the radio transceiver unit 10 (or the radio transmitter unit 10a). The upper layer processing unit 14 performs processing of the MAC layer, the packet data integration protocol layer, the radio link control layer, and the RRC layer.

[0089] The medium access control layer processing unit 15 included in the upper layer processing unit 14 performs processing of the MAC layer.

[0090] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing of the RRC layer. The wired resource control layer processing unit 16 processes various setting information / parameters (RRC parameters) of the terminal device 1. The radio resource control layer processing unit 16 manages the RRC message received from the base station device 3. Set RRC parameters based on the message.

[0091] The radio transmission / reception unit 10 (or the radio transmission unit 10a) performs processes such as modulation and encoding. The radio transceiver 10 (or the radio transmitter 10a) modulates, encodes, and transmits uplink data. The radio transmission / reception unit 10 (or the radio transmission unit 10a) generates a physical signal by generating a baseband signal (converting it into a time-continuous signal) and transmits it to the base station device 3. Alternatively, the signal may be arranged in a certain BWP (active uplink BWP) and transmitted to the base station device 3.

[0092] The wireless transceiver unit 10 (or the wireless receiver unit 10b) performs processes such as demodulation and decoding. The radio transmission / reception unit 10 (or the radio reception unit 30b) may receive a physical signal in a certain BWP (active downlink BWP) of a certain serving cell. The wireless receiving unit 10b) separates, demodulates, and decodes the received physical signal, and outputs the decoded information as The upper layer processing unit 14 outputs the physical signal to the wireless transmission / reception unit 10 (wireless reception unit 10b). A channel access procedure may be performed prior to the

[0093] The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal by quadrature demodulation (down-converts) and removes unnecessary frequency components. The digital signal processing unit 12 outputs the processed analog signal to the baseband unit 13 .

[0094] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 extracts a cyclic prefix (CP) from the converted digital signal. The signal with the CP removed is then subjected to a fast Fourier transform (FFT). nsform) to extract the frequency domain signal.

[0095] The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the uplink data to generate an OFDM symbol, and adds a CP to the generated OFDM symbol. The baseband unit 13 generates a baseband digital signal and converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0096] The RF unit 12 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 13, and up-converts the analog signal to a carrier frequency. The RF unit 12 converts the received signal into a digital signal and transmits it via the antenna unit 11. The RF unit 12 may also have a function of controlling transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0097] The physical signals (signals) will be explained below.

[0098] The physical signal is a general term for the downlink physical channel, the downlink physical signal, the uplink physical channel, and the uplink physical channel. The physical channel is a general term for the downlink physical channel and the uplink physical channel. The physical signal is a general term for the downlink physical signal and the uplink physical signal.

[0099] The uplink physical channel may correspond to a set of resource elements that convey information generated in a higher layer. The uplink physical channel may be a physical channel used in an uplink component carrier. The uplink physical channel may be transmitted by a terminal device 1. The 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 some or all of the following uplink physical channels may be used. ·PUCCH (Physical Uplink Control CHannel) ·PUSCH (Physical Uplink Shared CHannel) ·PRACH(Physical Random Access CHannel)

[0100] The PUCCH is used to transmit uplink control information (UCI). The PUCCH may be used. The PUCCH may be transmitted to deliver (deliver, transmit, convey) uplink control information. The uplink control information may be mapped to the PUCCH. The terminal device 1 may transmit the PUCCH in which the uplink control information is mapped. The base station device 3 may receive the PUCCH in which the uplink control information is mapped.

[0101] Uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) is channel state information (CSI), schedule The SR includes at least a part or all of the Scheduling Request (SR) and Hybrid Automatic Repeat request ACKnowledgement (HARQ-ACK) information.

[0102] The channel state information is also referred to as a channel state information bit or a channel state information sequence. The scheduling request is also referred to as a scheduling request bit or a scheduling request sequence. The HARQ-ACK information is also referred to as a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0103] The HARQ-ACK information may include at least a HARQ-ACK corresponding to a transport block (TB). The HARQ-ACK may indicate an acknowledgement (ACK) or a negative-acknowledgement (NACK) corresponding to the transport block. The ACK may indicate that the decoding of the transport block has been successfully completed. The NACK may indicate that the decoding of the transport block has not been successfully completed. The HARQ-ACK information may include a HARQ-ACK codebook including one or more HARQ-ACK bits.

[0104] A transport block is a sequence of information bits delivered from higher layers. Here, the sequence of information bits is also called a bit sequence. Here, the transport block may be delivered via an UpLink-Shared CHannel (UL-SCH) in the transport layer.

[0105] In some cases, the HARQ-ACK for a transport block is referred to as the HARQ-ACK for a PDSCH. In this case, the HARQ-ACK for the PDSCH is sent via the transport Indicates the HARQ-ACK for the block.

[0106] The HARQ-ACK may indicate an ACK or NACK corresponding to one Code Block Group (CBG) included in the transport block.

[0107] A scheduling request is a request to retrieve the UL-SCH for a new transmission. The scheduling request bit may be used at least to request a UL-SCH for initial transmission by the terminal device 1. The scheduling request bit may be used to indicate either a positive SR or a negative SR. The scheduling request bit indicating a positive SR is also referred to as "a positive SR is conveyed." A positive SR indicates that the terminal device 1 is to transmit a UL-SCH for initial transmission. A positive SR may indicate that UL-SCH resources are requested for initial transmission. A positive SR may indicate that a scheduling request is triggered by a higher layer. A positive SR may be conveyed when a scheduling request is indicated by a higher layer. The scheduling request bit indicating a negative SR is also referred to as "a negative SR is transmitted". A negative SR may indicate that no UL-SCH resources are requested by the terminal device 1 for initial transmission. A positive SR may indicate that no scheduling request is triggered by higher layers. A negative SR may be conveyed when no scheduling request is indicated by higher layers.

[0108] The channel state information may include at least some or all of a Channel Quality Indicator (CQI), a Precoder Matrix Indicator (PMI), and a Rank Indicator (RI). The CQI is an index related to the quality of a propagation path (e.g., propagation strength) or the quality of a physical channel, and the PMI is an index related to a precoder. The RI is an index related to a transmission rank (or the number of transmission layers).

[0109] The channel state information is an indicator of the reception state of at least a physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel state information is The channel measurement may be determined by the terminal device 1 based on the reception conditions assumed by at least the physical signals used for the channel measurement. The channel measurement may include an interference measurement.

[0110] The PUCCH may correspond to a PUCCH format. The PUCCH may be a set of resource elements used to convey the PUCCH format. The PUCCH may include a PUCCH format. The PUCCH may be transmitted with a certain PUCCH format. The PUCCH format may be interpreted as a format of information. The PUCCH format may also be interpreted as a set of information set to a certain information format.

[0111] The PUSCH carries transport blocks and / or uplink control information. The transport block may be placed in the PUSCH. The transport block delivered by the UL-SCH may be arranged in the PUSCH. The uplink control information may be arranged in the PUSCH. Alternatively, the PUSCH may include either or both of the uplink control information and the uplink control information. The base station device 3 may receive a PUSCH in which one or both of a transport block and uplink control information are mapped.

[0112] The PRACH may be transmitted to convey a random access preamble. The base station device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. column x u,v (n) is x u,v (n)=x u (mod(n+C v ,L RA ) where x u is a ZC (Zadoff Chu) sequence. Also, x u x u =exp(-jπui(i+1) / L RA ) by may be defined as follows: j is the imaginary unit, and π is the ratio of the circumference of a circle to its circumference. v corresponds to the cyclic shift of the PRACH sequence. RA corresponds to the length of the PRACH sequence. RA is 839 or 139. Also, i ranges from 0 to L RA -1 and u is the sequence index for the PRACH sequence.

[0113] For each PRACH opportunity, 64 random access preambles are defined. The access preamble is the cyclic shift C of the PRACH sequence. v, and the sequence index u for the PRACH sequence. An index may be assigned to each of the bulls.

[0114] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal may not be used to transmit information generated in a higher layer. In addition, the uplink physical signal may be used to transmit information generated in a physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The terminal device 1 may transmit the uplink physical signal. The base station device 3 may receive the uplink physical signal. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following uplink physical signals may be used. ·UL DMRS(UpLink Demodulation Reference Signal) ·SRS(Sounding Reference Signal) ·UL PTRS(UpLink Phase Tracking Reference Signal)

[0115] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0116] A set of antenna ports of a DMRS for a PUSCH (a DMRS related to a PUSCH, a DMRS included in a PUSCH, a DMRS corresponding to a PUSCH) may be given based on a set of antenna ports for the PUSCH. For example, the set of antenna ports of a DMRS for a PUSCH may be the same as the set of antenna ports for the PUSCH.

[0117] The transmission of the PUSCH and the transmission of the DMRS for the PUSCH are indicated by one DCI format. The PUSCH and the DMRS for the PUSCH may be collectively referred to as a PUSCH. Transmitting the PUSCH may be transmitting the PUSCH and the DMRS for the PUSCH.

[0118] The propagation path of the PUSCH may be estimated from the DMRS for the PUSCH.

[0119] The set of antenna ports for DMRS for PUCCH (DMRS related to PUCCH, DMRS included in PUCCH, DMRS corresponding to PUCCH) may be the same as the set of antenna ports for PUCCH.

[0120] The transmission of the PUCCH and the transmission of the DMRS for the PUCCH are indicated by one DCI format. Mapping of PUCCH to resource elements (resource element mapping), and to the resource element of the DMRS for the PUCCH One or both of the mappings may be provided by one PUCCH format. The PUCCH and the DMRS for the PUCCH may be collectively referred to as a PUCCH. Transmitting a PUCCH may be transmitting a PUCCH and a DMRS for the PUCCH.

[0121] The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0122] The downlink physical channel may correspond to a set of resource elements that convey information generated in a higher layer. The downlink physical channel may be a physical channel used in a downlink component carrier. The base station device 3 may transmit the downlink physical channel. The terminal device 1 may receive the downlink physical channel. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical channels may be used. ·PBCH(Physical Broadcast Channel) ·PDCCH (Physical Downlink Control Channel) ·PDSCH(Physical Downlink Shared Channel)

[0123] The PBCH may be transmitted to convey one or both of a Master Information Block (MIB) and physical layer control information. Here, the physical layer control information is information generated in the physical layer. The MIB is a set of parameters arranged in a Broadcast Control CHannel (BCCH), which is a logical channel of the MAC layer. The BCCH is arranged in a BCH, which is a channel of the transport layer. The BCH may be arranged (mapped) in the PBCH. The terminal device 1 may receive the PBCH in which the MIB and one or both of the physical layer control information are arranged. The base station device 3 may transmit the PBCH in which the MIB and one or both of the physical layer control information are arranged.

[0124] For example, the physical layer control information may be configured with 8 bits. The physical layer control information may include at least some or all of the following 0A to 0D. 0A) Radio frame bit 0B) Half radio frame (half system frame, half frame) bit 0C) SS / PBCH block index bit 0D) Subcarrier offset bit

[0125] The radio frame bits are used to indicate the radio frame in which the PBCH is transmitted (the radio frame including the slot in which the PBCH is transmitted). The radio frame bits include 4 bits. The radio frame bits may be configured by 4 bits of a 10-bit radio frame indicator. For example, the radio frame indicator may be used at least to identify radio frames with index 0 to index 1023.

[0126] The half radio frame bit is used to indicate whether the PBCH is transmitted in the first five subframes or the last five subframes of a radio frame in which the PBCH is transmitted. Here, the half radio frame may be configured to include five subframes. Alternatively, the half radio frame may be configured to include the first five subframes of the ten subframes included in the radio frame. Alternatively, the half radio frame may be configured to include the last five subframes of the ten subframes included in the radio frame.

[0127] The SS / PBCH block index bits are used to indicate the SS / PBCH block index. The SS / PBCH block index bits include 3 bits. The SS / PBCH block index bits are 3 bits of the 6-bit SS / PBCH block index indicator. An SS / PBCH block index indicator may be used at least to identify SS / PBCH blocks from index 0 through index 63. An SS / PBCH block may be referred to as an SSB.

[0128] The subcarrier offset bit is used to indicate a subcarrier offset, which may be used to indicate the difference between the first subcarrier to which the PBCH is mapped and the first subcarrier to which the control resource set with index 0 is mapped.

[0129] The PDCCH may be transmitted to transmit Downlink Control Information (DCI). The DCI may be mapped to the PDCCH. The base station device 3 may receive the PDCCH in which the downlink control information is arranged. A PDCCH in which downlink control information is arranged may be transmitted.

[0130] The downlink control information may be transmitted with a DCI format. The DCI format may be interpreted as a format of the downlink control information. The DCI format may be It may also be interpreted as a set of downlink control information set in a certain downlink control information format.

[0131] DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format 1_1 are DCI formats. The downlink DCI format is a general term for format 0_0 and DCI format 0_1. The downlink DCI format is a general term for DCI format 1_0 and DCI format 1_1.

[0132] DCI format 0_0 is used at least for scheduling PUSCHs in a cell. DCI format 0_0 is used for some of the fields from 1A to 1E or It consists of at least all of the above. 1A) Identifier field for DCI formats 1B) Frequency domain resource assignment field 1C) Time domain resource assignment field 1D) Frequency hopping flag field 1E) MCS field (Modulation and Coding Scheme field)

[0133] The DCI format specific field is a DCI format that includes the DCI format specific field. The DCI format specification field may indicate whether the format is an uplink DCI format or a downlink DCI format. That is, the DCI format specification field may be included in each of the uplink DCI format and the downlink DCI format. Here, the DCI format specification field included in the DCI format 0_0 may indicate 0.

[0134] The frequency domain resource allocation field included in DCI format 0_0 may be used to indicate the allocation of frequency resources for the PUSCH.

[0135] The time domain resource allocation field included in DCI format 0_0 may be used to indicate the allocation of time resources for the PUSCH.

[0136] The frequency hopping flag field indicates whether frequency hopping is applied to the PUSCH. It may be used to indicate whether or not

[0137] The MCS field included in DCI format 0_0 specifies the modulation scheme for PUSCH, and , and the target coding rate for the transport block placed on the PUSCH. The size of a transport block (TBS) allocated to the PUSCH may be determined based on one or both of a target coding rate and a modulation scheme for the PUSCH.

[0138] DCI format 0_0 does not include fields used for CSI requests. It's not necessary.

[0139] DCI format 0_0 may not include a carrier indicator field. That is, the serving cell to which the uplink component carrier on which the PUSCH scheduled by the DCI format 0_0 is allocated belongs uses the DCI format 0_0. The cell is the same as the serving cell of the uplink component carrier on which the PDCCH including the The terminal device 1 may detect the DCI format 0_0 in a downlink component carrier of a serving cell, and may transmit a PUSCH scheduled in accordance with the DCI format 0_0 to an uplink component carrier of the serving cell. It may be recognized that the carrier may be placed in the carrier.

[0140] DCI format 0_0 may not include the BWP field. The DCI format 0_0 may be a DCI format for scheduling a PUSCH without changing an active uplink BWP. The terminal device 1 may recognize that the PUSCH is to be transmitted without switching the active uplink BWP based on detecting the DCI format 0_0 used for scheduling the PUSCH.

[0141] DCI format 0_1 ​​is used at least for scheduling PUSCHs in a cell. DCI format 0_1 ​​is used for some of fields 2A to 2H or It consists of at least all of the above. 2A) DCI format specific fields 2B) Frequency domain resource allocation field 2C) Uplink time domain resource allocation field 2D) Frequency hopping flag field 2E) MCS Field 2F) CSI request field 2G) BWP field 2H) Carrier indicator field

[0142] The DCI format specific field included in DCI format 0_1 ​​may indicate 0.

[0143] The frequency domain resource allocation field included in DCI format 0_1 ​​may be used to indicate the allocation of frequency resources for the PUSCH.

[0144] The time domain resource allocation field included in DCI format 0_1 ​​may be used to indicate the allocation of time resources for the PUSCH.

[0145] The MCS field included in DCI format 0_1 ​​specifies the modulation scheme for PUSCH, and and / or may at least be used to indicate some or all of the target coding rate.

[0146] The BWP field of DCI format 0_1 ​​is the The DCI format 0_1 ​​may be used to indicate an uplink BWP in which a PUSCH to be scheduled is arranged. That is, the DCI format 0_1 ​​may involve a change in an active uplink BWP. The terminal device 1 may recognize an uplink BWP in which a PUSCH is arranged based on detecting the DCI format 0_1 ​​used for scheduling a PUSCH.

[0147] DCI format 0_1, which does not include the BWP field, is used to change the active uplink BWP. The terminal device 1 may recognize that the PUSCH is to be transmitted without switching the active uplink BWP based on detecting the DCI format D0_1, which is the DCI format 0_1 ​​used for scheduling the PUSCH and does not include the BWP field.

[0148] DCI format 0_1 ​​includes the BWP field, but terminal device 1 does not include the DCI format If the terminal device 1 does not support the BWP switching function by 0_1, the BWP field may be ignored by the terminal device 1. In other words, a terminal device 1 that does not support the BWP switching function , DCI format 0_1 ​​used for PUSCH scheduling and BWP format Based on detecting the DCI format 0_1 ​​including the field, the terminal device 1 may recognize that it transmits the PUSCH without switching the active uplink BWP. If the terminal device 1 supports the BWP switching function, it may report that "the terminal device 1 supports the BWP switching function" in the RRC layer capability information reporting procedure.

[0149] The CSI request field is used to indicate the reporting of CSI.

[0150] If the DCI format 0_1 ​​includes a carrier indicator field, The rear indicator field is the uplink component carrier in which the PUSCH is placed. The DCI format 0_1 ​​may be used to indicate a carrier indicator. If the field is not included, the uplink component carrier on which the PUSCH is located is A PDCCH including DCI format 0_1 ​​used for scheduling the PUSCH is arranged. When the number of uplink component carriers configured in the terminal device 1 in a certain serving cell group is two or more (when uplink carrier aggregation is operated in a certain serving cell group), the scheduling of the PUSCH arranged in the certain serving cell group may be the same as the uplink component carrier. The carrier indicator field included in the DCI format 0_1 ​​used for The number of bits may be 1 bit or more (for example, 3 bits). When the number of uplink component carriers configured in the terminal device 1 in a certain serving cell group is 1 (when uplink carrier aggregation is not operated in a certain serving cell group), the scheduling of the PUSCH arranged in the certain serving cell group may be set to 1 bit or more (for example, 3 bits). Carrier indicator field included in DCI format 0_1 ​​used for may be 0 (or the carrier indicator field may not be included in DCI format 0_1 ​​used for scheduling the PUSCH arranged in the certain serving cell group).

[0151] DCI format 1_0 is used at least for scheduling of PDSCHs allocated to a certain cell. DCI format 1_0 includes at least some or all of 3A to 3F. It also includes the following: 3A) DCI format specific fields 3B) Frequency domain resource allocation field 3C) Time Domain Resource Allocation Field 3D) MCS field 3E) PDSCH_HARQ feedback timing indicator field 3F) PUCCH resource indicator field

[0152] The DCI format specific field included in DCI format 1_0 may indicate 1.

[0153] The frequency domain resource allocation field included in DCI format 1_0 may be used at least to indicate the allocation of frequency resources for the PDSCH.

[0154] The time domain resource allocation field included in DCI format 1_0 may be used at least to indicate the allocation of time resources for the PDSCH.

[0155] The MCS field included in DCI format 1_0 specifies the modulation scheme for PDSCH, and , and the target coding rate for the transport block placed in the PDSCH. The size of a transport block (TBS) allocated to the PDSCH may be determined based on one or both of a target coding rate and a modulation scheme for the PDSCH.

[0156] The PDSCH_HARQ feedback timing indication field specifies the offset from the slot containing the last OFDM symbol of the PDSCH to the slot containing the first OFDM symbol of the PUCCH. It may also be used to indicate

[0157] The PUCCH resource indication field may be a field indicating an index of one or more PUCCH resources included in a PUCCH resource set. A PUCCH resource set may include one or more PUCCH resources.

[0158] DCI format 1_0 may not include a carrier indicator field. That is, the downlink component carrier on which the PDSCH scheduled by the DCI format 1_0 is arranged may be the same as the downlink component carrier on which the PDCCH including the DCI format 1_0 is arranged. Based on detecting the DCI format 1_0 in a certain downlink component carrier, the terminal device 1 may detect the PDSCH scheduled by the DCI format 1_0 in the downlink component carrier. It may be recognized that the carrier may be placed in the carrier.

[0159] DCI format 1_0 may not include the BWP field. The DCI format 1_0 may be a DCI format for scheduling the PDSCH without changing the active downlink BWP. The terminal device 1 may recognize that the PDSCH is to be received without switching the active downlink BWP based on detecting the DCI format 1_0 used for scheduling the PDSCH.

[0160] DCI format 1_1 is used at least for scheduling PDSCHs allocated to a certain cell. DCI format 1_1 includes at least some or all of 4A to 4I. It also includes the following: 4A) DCI format specific fields 4B) Frequency domain resource allocation field 4C) Time Domain Resource Allocation Field 4E) MCS Field 4F) PDSCH_HARQ feedback timing indication field 4G) PUCCH resource indication field 4H) BWP Field 4I) Career Indicator Field

[0161] The DCI format specific field included in DCI format 1_1 may indicate 1.

[0162] The frequency domain resource allocation field included in DCI format 1_1 may be used at least to indicate the allocation of frequency resources for the PDSCH.

[0163] The time domain resource allocation field included in DCI format 1_1 may be used at least to indicate the allocation of time resources for the PDSCH.

[0164] The MCS field included in DCI format 1_1 specifies the modulation scheme for PDSCH, and , may be used to indicate at least one or both of the target coding rates.

[0165] If DCI format 1_1 includes a PDSCH_HARQ feedback timing indication field, the PDSCH_HARQ feedback timing indication field may be used at least to indicate an offset from a slot including the last OFDM symbol of the PDSCH to a slot including the first OFDM symbol of the PUCCH. If DCI format 1_1 does not include a PDSCH_HARQ feedback timing indication field, the offset from a slot including the last OFDM symbol of the PDSCH to a slot including the first OFDM symbol of the PUCCH may be specified by a higher layer parameter.

[0166] The PUCCH resource indication field may be a field indicating an index of one or more PUCCH resources included in a PUCCH resource set.

[0167] The BWP field of DCI format 1_1 is the The DCI format 1_1 may be used to indicate the downlink BWP in which the PUSCH to be scheduled is arranged. That is, the DCI format 1_1 may involve a change in the active downlink BWP. The terminal device 1 may recognize the downlink BWP in which the PUSCH is arranged based on detecting the DCI format 1_1 used for scheduling the PDSCH.

[0168] DCI format 1_1, which does not include the BWP field, is used to change the active downlink BWP. The terminal device 1 may recognize that the PDSCH is to be received without switching the active downlink BWP based on detecting the DCI format 1_1 that is used for scheduling the PDSCH and does not include the BWP field.

[0169] DCI format 1_1 includes the BWP field, but terminal device 1 does not include the DCI format If the terminal device 1 does not support the BWP switching function by 1_1, the BWP field may be ignored by the terminal device 1. In other words, the terminal device 1 that does not support the BWP switching function , DCI format 1_1 used for PDSCH scheduling and BWP format Based on detecting the DCI format 1_1 including the field, the terminal device 1 may recognize that it will receive the PDSCH without switching the active downlink BWP. If the terminal device 1 supports the BWP switching function, it may report that "the terminal device 1 supports the BWP switching function" in the RRC layer capability information reporting procedure.

[0170] If DCI format 1_1 includes a carrier indicator field, The rear indicator field is the downlink component carrier on which the PDSCH is located. DCI Format 1_1 may be used to indicate a carrier indicator. If the field is not included, the downlink component carrier on which the PDSCH is arranged is A PDCCH including DCI format 1_1 used for scheduling the PDSCH is arranged. When the number of downlink component carriers configured in the terminal device 1 in a certain serving cell group is two or more (when downlink carrier aggregation is operated in a certain serving cell group), the scheduling of the PDSCH arranged in the certain serving cell group may be the same as the downlink component carrier configured in the certain serving cell group. The carrier indicator field included in the DCI format 1_1 used for The number of bits may be 1 bit or more (for example, 3 bits). When the number of downlink component carriers configured in the terminal device 1 in a certain serving cell group is 1 (when downlink carrier aggregation is not operated in a certain serving cell group), the scheduling of the PDSCH arranged in the certain serving cell group may be Carrier indicator field included in DCI format 1_1 used for may be 0 (or the carrier indicator field may not be included in DCI format 1_1 used for scheduling the PDSCH allocated to the certain serving cell group).

[0171] The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block delivered by the DL-SCH. The PDSCH may be used to transmit a transport block. The transport block may be arranged in the PDSCH. A transport block corresponding to the DL-SCH may be arranged in the PDSCH. The base station device 3 may transmit the PDSCH. The terminal device 1 may receive the PDSCH.

[0172] The downlink physical signal may correspond to a set of resource elements. The downlink physical signal may not carry information generated in a higher layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The downlink physical signal may be transmitted by a base station device 3. The 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 some or all of the following downlink physical signals may be used. ·Synchronization signal (SS) ·DL DMRS(DownLink DeModulation Reference Signal) ·CSI-RS(Channel State Information-Reference Signal) ·DL PTRS(DownLink Phase Tracking Reference Signal)

[0173] The synchronization signal may be used by the terminal device 1 to synchronize one or both of the frequency domain and the time domain of the downlink. The synchronization signal is a general term for a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0174] FIG. 7 is a diagram showing an example of the configuration of an SS / PBCH block according to one embodiment of the present invention. In FIG. 7, the horizontal axis is the time axis (OFDM symbol index l sym ), where the vertical axis represents the frequency domain. Block 700 represents a set of resource elements for a PSS. Block 720 shows a set of resource elements for SSS. The blocks (blocks 710, 711, 712, and 713) indicate a set of resource elements for the PBCH and a DMRS for the PBCH (DMRS associated with the PBCH, DMRS included in the PBCH, and DMRS corresponding to the PBCH).

[0175] As shown in FIG. 7, the SS / PBCH block includes a PSS, an SSS, and a PBCH. The SS / PBCH block includes four consecutive OFDM symbols. The SS / PBCH block includes 240 subcarriers. The PSS is the 57th to 183rd subcarriers in the first OFDM symbol. The SSS is placed in subcarriers 57 to 183 in the third OFDM symbol. The PBCH is allocated to the 1st subcarrier of the 1st OFDM symbol. The 1st to 56th subcarriers of the 1st OFDM symbol may be set to zero. The 184th to 240th subcarriers of the 1st OFDM symbol may be set to zero. The 49th to 56th subcarriers of the 3rd OFDM symbol may be set to zero. The 184th to 192nd subcarriers of the 3rd OFDM symbol may be set to zero. The PBCH is allocated to the 1st to 240th subcarriers of the 2nd OFDM symbol, and to subcarriers in which the DMRS for the PBCH is not allocated. The PBCH is allocated to the 1st to 48th subcarriers of the 3rd OFDM symbol, and to subcarriers in which the DMRS for the PBCH is not allocated. The PBCH is allocated to the 193rd to 240th subcarriers of the 3rd OFDM symbol, and to subcarriers in which the DMRS for the PBCH is not allocated. The PBCH is allocated to the 1st to 240th subcarriers of the 4th OFDM symbol, which are subcarriers in which the DMRS for the PBCH is not allocated.

[0176] The antenna ports for the PSS, SSS, PBCH, and DMRS for the PBCH may be the same.

[0177] The PBCH on which a PBCH symbol is transmitted at a certain antenna port may be estimated by the DMRS for the PBCH that is placed in the slot to which the PBCH is mapped and is included in the SS / PBCH block to which the PBCH is included.

[0178] DL DMRS is a general term for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0179] A set of antenna ports of DMRS for PDSCH (DMRS related to PDSCH, DMRS included in PDSCH, DMRS corresponding to PDSCH) may be given based on the set of antenna ports for the PDSCH, i.e., the set of antenna ports of DMRS for PDSCH may be the same as the set of antenna ports for the PDSCH.

[0180] The transmission of the PDSCH and the transmission of the DMRS for the PDSCH are indicated by one DCI format. The PDSCH and the DMRS for the PDSCH may be collectively referred to as a PDSCH. Transmitting a PDSCH may be transmitting a PDSCH and a DMRS for the PDSCH.

[0181] The propagation path of a PDSCH may be estimated from the DMRS for that PDSCH. A set of resource elements on which a DMRS symbol is transmitted and the symbol of the DMRS for the PDSCH are transmitted. In a case where a set of resource elements on which a symbol of a PDSCH is transmitted is included in the same precoding resource group (PRG), the PDSCH on which a symbol of the PDSCH is transmitted in a certain antenna port may be estimated by the DMRS for the PDSCH.

[0182] The antenna port of the DMRS for the PDCCH (DMRS related to the PDCCH, DMRS included in the PDCCH, DMRS corresponding to the PDCCH) may be the same as the antenna port for the PDCCH.

[0183] The PDCCH may be estimated from the DMRS for the PDCCH. That is, the propagation path of the PDCCH may be estimated from the DMRS for the PDCCH. a set of resource elements and a resource on which symbols of a DMRS for the PDCCH are transmitted If the same precoder is applied (is assumed to be applied, is assumed to be applied) in a set of elements, the symbols of the PDCCH at a certain antenna port are transmitted. The PDCCH to be transmitted may be estimated by the DMRS for the PDCCH.

[0184] BCH (Broadcast CHannel), UL-SCH (Uplink-Shared CHannel), and DL-SCH (D Ownlink-Shared CHannel (Ownlink-Shared CHannel) is a transport channel. A transport channel specifies the relationship between a physical layer channel and a MAC layer channel (also called a logical channel). do.

[0185] The BCH of the transport layer is mapped to the PBCH of the physical layer. The transport blocks on the BCH are delivered to the PBCH of the physical layer. The UL-SCH of the transport layer is mapped to the PUSCH of the physical layer, i.e., the transport block carried by the UL-SCH of the transport layer is delivered to the PUSCH of the physical layer. Also, the DL-SCH of the transport layer is mapped to the PDSCH of the physical layer, i.e., the transport block carried by the DL-SCH of the transport layer is delivered to the PDSCH of the physical layer.

[0186] For each serving cell, one UL-SCH and one DL-SCH may be provided. The BCH may be provided for the PCell. The BCH does not have to be provided for the PSCell or SCell.

[0187] In the MAC layer, hybrid automatic repeat reQuest (HARQ) control is performed for each transport block.

[0188] The BCCH (Broadcast Control CHannel), the CCCH (Common Control CHannel), and the DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH is a channel of the RRC layer used for transmitting MIB or system information. The CCCH (Common Control CHannel) may be used for transmitting an RRC message common to a plurality of terminal devices 1. Here, the CCCH may be used, for example, for a terminal device 1 that is not RRC-connected. The DCCH (Dedicated Control CHannel) may be used at least for transmitting an RRC message dedicated to the terminal device 1. Here, the DCCH may be used, for example, for a terminal device 1 that is RRC-connected.

[0189] For example, system information (SI) may be composed of an MIB and several SIBs (System Information blocks). Also, system information may be divided into Minimum SI and Other SI. Minimum SI may include basic information required for initial access. Furthermore, Minimum SI may include information for acquiring Other SI. Minimum SI may be composed of an MIB and SIB1. Other SI may include all SIBs that are not broadcast in Minimum SI. These SIBs may be broadcast or transmitted in DL-SCH.

[0190] SIB1 may define the scheduling of Other SI. SIB1 may include information required for initial access. SIB1 may be referred to as Remaining Minimum SI (RMSI). SIB1 may be periodically left on DL-SCH. SIB1 is used in the RRC_CONNECTED state. The UEs may be transmitted in a dedicated manner on the DL-SCH to some UEs in the DL-SCH.

[0191] The upper layer parameters common to a plurality of terminal devices 1 are also referred to as common upper layer parameters. Here, the common upper layer parameters may be defined as parameters specific to a serving cell. Here, the parameters specific to a serving cell are parameters common to terminal devices (e.g., terminal devices 1-A, B, C) in which the serving cell is set. It may also be a data.

[0192] For example, the common higher layer parameters may be included in the RRC messages delivered on the BCCH. For example, the common upper layer parameters may be included in an RRC message delivered on the DCCH. .

[0193] Among the upper layer parameters, the upper layer parameters different from the common upper layer parameters are These are also called dedicated higher layer parameters. Here, the dedicated higher layer parameters can provide dedicated RRC parameters to the terminal device 1-A in which the serving cell is set. In other words, the dedicated RRC parameters are higher layer parameters that can provide unique settings for each of the terminal devices 1-A, 1-B, and 1-C.

[0194] The BCCH of the logical channel is mapped to the BCH or DL-SCH of the transport layer. For example, a transport block including MIB information is delivered to the BCH of the transport layer. A transport block including system information other than MIB is delivered to the DL-SCH of the transport layer. A CCCH is mapped to the DL-SCH or UL-SCH. That is, a transport block mapped to a CCCH is delivered to the DL-SCH or UL-SCH. A DCCH is mapped to the DL-SCH or UL-SCH. That is, a transport block mapped to a DCCH is delivered to the DL-SCH or UL-SCH.

[0195] The RRC message includes one or more parameters managed in the RRC layer. Here, the parameters managed in the RRC layer are also referred to as RRC parameters. For example, the RRC message may include an MIB. The RRC message may also include system information. The RRC message may also include a message corresponding to a CCCH. The RRC message may also include a message corresponding to a DCCH. The RRC message including a message corresponding to a DCCH is also referred to as an individual RRC message.

[0196] The upper layer parameters are RRC parameters or parameters included in MAC CE (Medium Access Control Control Element). In other words, the upper layer parameters are a collective term for MIB, system information, messages corresponding to CCCH, messages corresponding to DCCH, and parameters included in MAC CE. The parameters included in MAC CE are transmitted by MAC CE (Control Element) commands.

[0197] The procedure performed by the terminal device 1 includes at least some or all of the following steps 5A to 5C. 5A) Cell search 5B) Random access 5C) Data communication

[0198] The cell search is a procedure used by the terminal device 1 to synchronize with a certain cell in terms of the time domain and the frequency domain and detect a physical cell identity. That is, the terminal device 1 may perform the cell search to synchronize with a certain cell in terms of the time domain and the frequency domain and detect a physical cell ID.

[0199] The sequence of the PSS is based at least on the physical cell ID. The sequence of the SSS is based at least on the physical cell ID.

[0200] The SS / PBCH block candidates indicate resources on which transmission of the SS / PBCH block is permitted (possible, reserved, configured, defined, possible).

[0201] The set of SS / PBCH block candidates in a half radio frame is also called the SS burst set. The SS burst set is a set of candidates for the transmission window. The SS burst set is also called the Discovery Reference Signal transmission window (DRS transmission window), or the Discovery Reference Signal transmission window (DRS transmission window). The SS burst set is a general term that includes at least the first SS burst set and the second SS burst set.

[0202] The base station device 3 transmits SS / PBCH blocks of one or more indexes at a predetermined period. The terminal device 1 may detect at least one of the SS / PBCH blocks of the one or more indexes, and attempt to decode the PBCH included in the SS / PBCH block.

[0203] Random access is a procedure that includes at least some or all of message 1, message 2, message 3, and message 4.

[0204] Message 1 is a procedure in which the PRACH is transmitted by the terminal device 1. The terminal device 1 transmit a PRACH in one PRACH opportunity selected from one or more PRACH opportunities based at least on an index of a SS / PBCH block candidate detected based on a cell search; Each PRACH opportunity is defined based on at least time and frequency domain resources. can be.

[0205] The terminal device 1 transmits one random access preamble selected from the PRACH opportunities corresponding to the index of the SS / PBCH block candidate in which the SS / PBCH block is detected. .

[0206] Message 2 is a procedure for the terminal device 1 to attempt to detect DCI format 1_0 accompanied by a CRC (Cyclic Redundancy Check) scrambled with an RA-RNTI (Random Access - Radio Network Temporary Identifier). The terminal device 1 detects a control resource set based on an MIB included in a PBCH included in an SS / PBCH block detected based on a cell search. The DCI format is displayed in the resource indicated based on the setting of the search area set. Message 2 is also called the random access response. It is called.

[0207] Message 3 is contained in DCI format 1_0 detected by the Message 2 procedure. The PUSCH transmission scheduled by the random access response grant is Here, the random access response grant The MAC CE included in the PDSCH scheduled by the DCI format 1_0 indicates the MAC CE.

[0208] The PUSCH scheduled based on the random access response grant is The message 3 PUSCH contains a contention resolution identifier (MAC CE). The contention resolution identifier (MAC CE) is used to identify the contention. Contains the resolution ID.

[0209] Message 3 PUSCH retransmissions are scheduled with DCI format 0_0 with CRC scrambled based on TC-RNTI (Temporary Cell - Radio Network Temporary Identifier).

[0210] Message 4 is a procedure for attempting to detect DCI format 1_0 with a CRC scrambled based on either a C-RNTI (Cell-Radio Network Temporary Identifier) ​​or a TC-RNTI. The terminal device 1 performs scheduling based on the DCI format 1_0. The PDSCH may include a collision resolution ID.

[0211] Data communication is a general term for downlink communication and uplink communication.

[0212] In data communication, the terminal device 1 attempts to detect the PDCCH in resources specified based on the control resource set and the search space set (monitors the PDCCH, detects the PDCCH, monitor).

[0213] A control resource set is a set of resources consisting of a certain number of resource blocks and a certain number of OFDM symbols. In the frequency domain, the control resource set may consist of continuous resources (non-interleaved mapping) or distributed resources. (interleaver mapping).

[0214] A set of resource blocks constituting the control resource set may be indicated by a higher layer parameter. The number of OFDM symbols constituting the control resource set may be indicated by a higher layer parameter.

[0215] A CORESET pool index may be provided for one or more Control Resource Sets (CORESETs). For example, the CORESET pool index may be provided by a higher layer parameter. For example, if not provided by the higher layer parameter, the CORESET pool index may be 0. The value of the CORESET pool index may be 0 or 1. The CORESET pool index may be referred to as an index of a CORESET resource pool. For example, in one active downlink BWP of one serving cell, the CORESET pool index may be provided. For example, a CORESET pool index of value 0 may be provided for the first plurality of CORESETs.

[0216] The terminal device 1 performs a first procedure for reporting HARQ-ACK information related to first CORESETs. The terminal device 1 may apply a second procedure for reporting HARQ-ACK information related to the first and second CORESETs. The terminal device 1 may apply the first procedure and the second procedure separately. The first CORESETs and the second CORESETs may be CORESETs in an active downlink BWP of one serving cell. A CORESET pool index of value 0 may be provided for the first CORESETs. A CORESET pool index of value 1 may be provided for the second CORESETs. The first CORESETs may be a first one or more CORESETs. The second CORESETs may be a second one or more CORESETs.

[0217] The TCI state (Transmission Configuration Indication state) is in the DCI format. The configuration of one or more TCI states (or a list of configurations) may be provided by a higher layer parameter for decoding the PDSCH. The device 1 may decode the PDSCH according to the decoded PDCCH. The parameter is used to set the QCL relationship between the downlink reference signal and the first antenna port. The QCL relationship may include a QCL-related parameter. For example, the first antenna port may be a DMRS port of the PDSCH (an antenna port associated with DMRS). The first antenna port may be a DMRS port of the PDCCH. The first antenna port may be a CSI-RS port of the CSI-RS resource. The QCL relationship may be set by a higher layer parameter. For example, the QCL relationship may be set by a higher layer parameter qcl-Type1 for the first downlink reference signal. For example, the QCL relationship may be set by a higher layer parameter qcl-Type2 for the second downlink reference signal. For example, the QCL relationship between the first antenna port and the second antenna port may indicate that the first antenna port and the second antenna port are QCL. The downlink reference signal may be a CSI-RS or an SS / PBCH block.

[0218] The CORESET pool index of the first CORESET may be different from the CORESET pool index of the second CORESET. The inclusion of two different values ​​of the CORESET pool index in different CORESETs may be configured by higher layer parameters. The first antenna port associated with one CORESET pool index of one serving cell may be assumed to be a first reference signal and a QCL.

[0219] The terminal device 1 attempts to detect the PDCCH in the search space set. Attempting to detect a PDCCH in the search space set may be attempting to detect a PDCCH candidate in the search space set, or attempting to detect a DCI format in the search space set. Alternatively, detection of the PDCCH may be attempted in the control resource set. Alternatively, the control resource set may be used to detect PDCCH candidates. , it may be to attempt to detect the DCI format in the control resource set.

[0220] The search space set is defined as a set of PDCCH candidates. The search space set may be a Common Search Space (CSS) set or a UE-specific Search Space (USS) set. The terminal device 1 attempts to detect PDCCH candidates in a part or all of a Type 0 PDCCH common search space set, a Type 0a PDCCH common search space set, a Type 1 PDCCH common search space set, a Type 2 PDCCH common search space set, a Type 3 PDCCH common search space set, and / or a UE-specific search space set.

[0221] The Type 0 PDCCH common search space set is used as the common search space set with index 0. The type 0 PDCCH common search space set may include the common search space with index 0. It may be a set.

[0222] The CSS set is a collective term for a type 0 PDCCH common search space set, a type 0a PDCCH common search space set, a type 1 PDCCH common search space set, a type 2 PDCCH common search space set, and a type 3 PDCCH common search space set. The USS set is also called a UE dedicated PDCCH search space set.

[0223] A search space set is associated with (contains, 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.

[0224] For a given search area set, some or all of 6A to 6C may be indicated by at least higher layer parameters. 6A) PDCCH monitoring periodicity 6B) PDCCH monitoring pattern within a slot 6C) PDCCH monitoring offset

[0225] A monitoring occasion for a certain search area set is defined as a monitoring occasion for the certain search area set. The monitoring opportunity for a search space set may correspond to an OFDM symbol in which a first OFDM symbol of an associated control resource set is located. The monitoring opportunity for a search space set may correspond to a resource of a control resource set starting from a first OFDM symbol of the control resource set associated with the search space set. The monitoring opportunity for the search space set is given based on at least some or all of a PDCCH monitoring interval, a PDCCH monitoring pattern in a slot, and a PDCCH monitoring offset.

[0226] 8 is a diagram showing an example of a monitoring opportunity of the search area set according to one aspect of the present embodiment. In FIG. 8, a search area set 91 and a search area set 92 are set in a primary cell 301, a search area set 93 is set in a secondary cell 302, and a search area set 94 is set in a secondary cell 303.

[0227] In FIG. 8, the white blocks in the primary cell 301 indicate the search area set 91, the black blocks in the primary cell 301 indicate the search area set 92, The blocks in secondary cell 302 represent search area set 93 and the blocks in secondary cell 303 represent search area set 94 .

[0228] The monitoring interval of the search area set 91 is set to 1 slot, and the monitoring The offset is set to 0 slot, and the monitoring pattern of the search area set 91 is [1,0 ,0,0,0,0,0,1,0,0,0,0,0,0,0]. The monitoring opportunities for search region set 91 correspond to the first OFDM symbol (OFDM symbol #0) and the eighth OFDM symbol (OFDM symbol #7) in each of the slots.

[0229] The monitoring interval of the search area set 92 is set to 2 slots, the monitoring offset of the search area set 92 is set to 0 slots, and the monitoring pattern of the search area set 92 is [1,0 ,0,0,0,0,0,0,0,0,0,0,0,0,0,0]. The monitoring opportunity for search region set 92 corresponds to the first OFDM symbol (OFDM symbol #0) in each of the even slots.

[0230] The monitoring interval of the search area set 93 is set to 2 slots, the monitoring offset of the search area set 93 is set to 0 slots, and the monitoring pattern of the search area set 93 is [0,0 ,0,0,0,0,0,1,0,0,0,0,0,0,0]. The monitoring opportunity for search region set 93 corresponds to the eighth OFDM symbol (OFDM symbol #7) in each of the even slots.

[0231] The monitoring interval of the search area set 94 is set to 2 slots, the monitoring offset of the search area set 94 is set to 1 slot, and the monitoring pattern of the search area set 94 is [1,0 ,0,0,0,0,0,0,0,0,0,0,0,0,0,0]. The monitoring opportunity for search region set 94 corresponds to the first OFDM symbol (OFDM symbol #0) in each odd slot.

[0232] The Type 0 PDCCH common search space set may be used at least for DCI formats with a Cyclic Redundancy Check (CRC) sequence scrambled by a System Information-Radio Network Temporary Identifier (SI-RNTI).

[0233] The Type 0a PDCCH common search space set is the SI-RNTI (System Information-Radio Network Interference CRC (Cyclic Redundancy Check) scrambled by a Temporary Identifier It may be used at least for DCI formats involving sequences.

[0234] The Type 1 PDCCH common search space set may be used at least for DCI formats with a CRC sequence scrambled by a Random Access-Radio Network Temporary Identifier (RA-RNTI) and / or a CRC sequence scrambled by a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI).

[0235] A Type 2 PDCCH common search space set may be used for DCI formats with a CRC sequence scrambled by a Paging-Radio Network Temporary Identifier (P-RNTI).

[0236] A Type 3 PDCCH common search space set may be used for a DCI format with a CRC sequence scrambled by a Cell-Radio Network Temporary Identifier (C-RNTI).

[0237] The UE dedicated PDCCH search space set may be used at least for DCI formats with CRC sequences scrambled by the C-RNTI.

[0238] In downlink communication, the terminal device 1 detects the downlink DCI format. The detected downlink DCI format is used at least for resource allocation of the PDSCH. The detected downlink DCI format is also called a downlink assignment. The terminal device 1 attempts to receive the PDSCH. Based on the PUCCH resource indicated based on the detected downlink DCI format, the terminal device 1 reports a HARQ-ACK corresponding to the PDSCH (a HARQ-ACK corresponding to a transport block included in the PDSCH) to the base station device 3.

[0239] In the uplink communication, the terminal device 1 detects the uplink DCI format. The detected DCI format is used at least for PUSCH resource allocation. The detected uplink DCI format is also called an uplink grant. The terminal device 1 transmits the PUSCH.

[0240] In the configured grant, PUSCH is scheduled. An uplink grant for scheduling is set for each transmission period of the PUSCH. When the PUSCH is scheduled by the uplink DCI format, some or all of the information indicated by the uplink DCI format may be indicated by the uplink grant set in the case of the set scheduling.

[0241] The UL slot may be a slot consisting of UL symbols. The special slot may be a slot consisting of UL symbols, flexible symbols, and DL symbols. The DL slot may be a slot consisting of DL symbols.

[0242] The UL symbol may be an OFDM symbol configured or indicated for the uplink in time division duplex. The UL symbol may be an OFDM symbol configured or indicated for the PUSCH, PUCCH, PRACH, or SRS. The UL symbol may be provided by the higher layer parameter tdd-UL-DL-ConfigurationCommon. The UL symbol may be provided by the higher layer parameter tdd-UL-DL-ConfigurationDedicated. The UL slots may be provided by the higher layer parameter tdd-UL-DL-ConfigurationCommon. The UL slots may be provided by the higher layer parameter tdd-UL-DL-ConfigurationDedicated. It may be provided by

[0243] The DL symbol may be an OFDM symbol configured or indicated for downlink in time division duplex. The DL symbol may be an OFDM symbol configured or indicated for PDSCH or PDCCH. The DL symbol may be provided by the higher layer parameter tdd-UL-DL-ConfigurationCommon. The DL symbol may be provided by the higher layer parameter tdd-UL-DL-ConfigurationDedicated. The DL slot may be provided by the higher layer parameter tdd-UL-DL-ConfigurationCommon. The DL slot may be provided by the higher layer parameter tdd-UL-DL-ConfigurationDedicated.

[0244] The flexible symbol may be an OFDM symbol that is not set or indicated as a UL symbol or DL ​​symbol among the OFDM symbols in a certain period. The certain period may be a period given by the higher layer parameter dl-UL-TransmissionPeriodicity. The flexible symbols may be for PDSCH, PDCCH, PUSCH, PUCCH, or PRACH. It may be an OFDM symbol that is set or indicated.

[0245] The upper layer parameter tdd-UL-DL-ConfigurationCommon may be a parameter for setting a UL slot, a DL slot, or a special slot for each of one or more slots. The upper layer parameter tdd-UL-DL-ConfigurationDedicated may be a parameter for setting a UL symbol, a DL symbol, or a flexible symbol for each of the one or more slots. The tdd-UL-DL-ConfigurationCommon may be a common upper layer parameter. The tdd-UL-DL-ConfigurationDedicated may be a dedicated upper layer parameter.

[0246] Multiple TRPs (Transmission Reception Points, or Transmit / Receive Points) are used. In the single-DCI mode, the terminal device 1 may be scheduled by the same DCI for two TRPs. The base station device 3 may be configured with a plurality of TRPs (Multi-TRP). The terminal device 1 may be scheduled by two TRPs in one serving cell. In the Multi-TRP, one of the operation modes of single-DCI and multi-DCI may be used. In the Multi-TRP, uplink control may be completed in the MAC layer and the physical layer. In the Multi-TRP, downlink control may be completed in the MAC layer and the physical layer. In the Single-DCI mode, the terminal device 1 may be scheduled by the same DCI for two TRPs. In the Multi-DCI mode, the terminal device 1 may be scheduled by an independent DCI from each TRP. In the Multi-DCI mode, each TRP in the Multi-TRP may be identified by TRP information. That is, one TRP in the Multi-TRP may be identified by one TRP information. The TRP information may be used to select one TRP. In addition, an index of a CORESET resource pool may be associated with one control resource set (CORESET: Control Resource Set). The terminal device 1 may transmit a PUSCH based on an index of a CORESET resource pool. The TRP information may be a CORESET pool index. The TRP information may be associated with an index of a CORESET resource pool. For example, a first CORESET pool index may be associated with a first TRP, and a second CORESET pool index may be associated with a second TRP. The TRP information may be associated with a pool (or a pool index) of a TCI state. The first one or more TCI states may be associated with a pool index of the first TCI state. The second one or more TCI states may be associated with a pool index of the second TCI state.

[0247] The value of the TA offset (Timing advance offset) may be provided by higher layer parameters. A timing advance (TA) may be determined based at least on a TA offset. One TA offset may be provided in one serving cell. Two TA offsets may be provided in one serving cell. If no higher layer parameters are provided, the terminal device 1 may determine a value of the TA offset. The terminal device 1 may determine two TA offset values ​​in one serving cell. The value of the TA offset may be N. TA,offset The higher layer parameter may be n-TimingAdvanceOffset. Determining the TA may be adjusting the uplink timing.

[0248] When two uplink carriers are configured in one serving cell, one TA access point is used. The TA offset value may be applied to two uplink carriers. When two Transmission Reception Points (TRPs) are configured in one serving cell, one TA offset value may be applied to two uplink carriers. The value may be applied to two TRPs. If two TRPs are configured in one serving cell, If so, two TA offset values ​​may be applied to each TRP.

[0249] The terminal device 1 may adjust the uplink timing. For example, the terminal device 1 may adjust the uplink timing in response to receiving a TA command (Timing advance command). For example, in response to receiving one TA command (Timing advance command) for one TAG (Timing advance group), the terminal device 1 may adjust the uplink timing for PUSCH / SRS / PUCCH transmission in all serving cells in one TAG. For example, in response to receiving one TA command for one TAG, the terminal device 1 may adjust the uplink timing for PUSCH / SRS / PUCCH transmission in one or more serving cells belonging to one TAG. For example, the terminal device 1 may adjust the uplink timing for N TA,offet The uplink timing may be adjusted based on the value of N TA,offset N may be the same for all serving cells in one TAG. TA,offset may not be the same for all serving cells in one TAG. TA,offset The value of and one or both of the TA commands The uplink timing may be adjusted based on the The uplink timing may be the same for all serving cells in the TAG. The first uplink timing may not be the same for all serving cells in one TAG. For example, the first uplink timing may be the same for a first portion of serving cells in one TAG. For example, the second uplink timing may be the same as that of the serving TAG. The first and second parts of the serving cells in one TAG may be the same. All serving cells in one TAG may be divided into the first and second parts. It may be link timing.

[0250] The terminal device 1 may determine the uplink timing based on at least some or all of the TA command, the TA offset, and the TRP information. , a first uplink timing and a second uplink timing may be determined. For example, the TRP (Transmission Reception Point) information may be information for identifying one TRP among one or more TRPs. For example, the TRP information may be an index for identifying one TRP. For example, one TRP may be determined based on the TRP information. For example, the TRP information may be information for identifying one or more TRPs. The TRP information may be provided by an upper layer parameter. The TRP information may be included in a random access response. The TRP information may be included in a DCI format.

[0251] Based on a timing adjustment indication for one TAG from the MCG The first uplink timing may be determined based on the timing adjustment instruction for one TAG from the SCG. The second uplink timing may be determined based on the timing adjustment instruction for one TAG from the SCG.

[0252] The TA command may be changed based on the subcarrier spacing. For example, in the subcarrier spacing setting μ, one TA command for one TAG is changed based on the uplink timing change. For example, the uplink timing may be changed to 16*64*T c / 2 μ "*" may be a multiplication operator.

[0253] The TA (Timing advance) of the random access preamble may be 0.

[0254] The TA command may be included in a random access response. The TA command may be sent as a MAC CE command. For example, the TA command may be an Absolute timing advance command MAC CE. The TA command T in the case of a random access response or an Absolute timing advance command MAC CE A For one TAG, N TA You may specify a value for T. A may be an integer between 0 and 3846. For example, N TA is T A *16*64 / 2 μ N TA may relate to the subcarrier spacing of a certain uplink transmission. For example, the certain uplink transmission may be an uplink transmission from the terminal device 1. For example, the certain uplink transmission may be the first uplink transmission after receiving a random access response. For example, the certain uplink transmission may be the first uplink transmission after receiving an absolute timing advance command MAC CE. T A may be an index value. The uplink transmission may be an uplink channel transmission.

[0255] TA Command T A For one TAG, the current N TA You may also specify a value adjustment. For example, the TA command T A is N TA,old From N TA,new N TA,new is N TA,old +(T A -31)*16*64 / 2 μ For example, T A may be an integer between 0 and 63.

[0256] If the terminal equipment has one or more active uplink BWPs, the TA command ( The subcarrier spacing of one or more active uplink BWPs is also related to the maximum subcarrier spacing of one or more active uplink BWPs. The TA command may be a TA command in one TAG including uplink BWPs in two uplink carriers of one serving cell. For example, N for one uplink BWP with interval TA,new may be rounded to fit the timing advance granularity for one uplink BWP with initial subcarrier spacing. Rounding a value may involve rounding off a value. For example, N TA,new may be rounded.

[0257] N by positive value TA The adjustment is for uplink transmission for one TAG (Timing advance group). It may indicate advancing of timing (uplink timing). TA The adjustment may indicate a delaying of uplink transmission timing for one TAG.

[0258] If one TA command is received in the first slot n, the uplink transmission timing adjustment may be applied from the beginning of the second slot. The first slot n may be an uplink slot. The uplink slot may be a slot in the uplink frame. The second slot may be the slot corresponding to n+k+1+2. μ *K offset Even though That is, the second slot is the first slot n to k+1+2. μ *K offset It may be a slot after a slot. offset may be provided by higher layer parameters. k is ceil(Nsubframe,μ slot ·(N T,1 +N T,2 +N TA,max +0.5) / T sf ) may be used. T,1 Units may be in milliseconds. T,1 is N 1 The duration of a symbol in milliseconds. N 1 The symbols may correspond to a PDSCH processing time. T,2 is N 2 It may be the duration of a symbol in milliseconds. 2 The symbol may correspond to a PUSCH preparation time. TA,max N may be the maximum timing advance value in milliseconds. TA,max N may be the maximum TA value that can be provided by the 12-bit TA command field. subframe,μ slot T may be the number of slots in one subframe. sf may be 1 millisecond. sf may be the duration of a subframe. offset is K cell,offset -K UE,offset It may be. cell,offset may be provided by higher layer parameters. UE,offset is one may be provided by the MAC CE command. cell,offset may be 0. UE,offset may be 0. N 1 and N 2 One or both of the above may be determined in relation to a minimum subcarrier spacing (SCS). The minimum subcarrier spacing is set It may be the minimum subcarrier spacing among all the subcarrier spacings of all the downlink BWPs and all the configured uplink BWPs. When μ=0, N 1 may be 14. Slots n and N subframe,μ slot may be determined relative to the minimum subcarrier spacing. TA,max may be determined relative to the minimum subcarrier spacing. Slot n may be the last slot of one or more slots that overlap with the slots of the PDSCH reception. For the PDSCH reception, T TA = 0. One TA command is received on the PDSCH. A PDSCH may be received that includes one TA command. The PDSCH may provide one TA command.

[0259] When the terminal device 1 changes the active uplink BWP, the terminal device 1 may determine a TA command (TA command value) based on the subcarrier spacing of the changed active uplink BWP. For example, when the terminal device 1 changes the active uplink BWP between the time of receiving the TA command and the time of applying the adjustment for the uplink transmission timing, the terminal device 1 may determine a new The TA command may be determined based on the subcarrier spacing of the active uplink BWP. After applying the adjustment for the uplink transmission timing, the active uplink BWP is changed. When the absolute timing advance command value is changed, the terminal 1 uses the same absolute timing advance command value. ng advance command MAC CE) may be assumed. The first absolute timing advance command value before the change may be the same as the second absolute timing advance command value after the active uplink BWP change.

[0260] When the downlink timing is changed and the downlink timing is not corrected, the terminal device 1 TA When the downlink timing is changed and the downlink timing is partially corrected by the uplink timing adjustment without the TA command, the terminal device 1 may change N TA The uplink timing adjustment may be that the uplink timing is determined or changed.

[0261] If one TA command overlaps two adjacent slots, the latter slot may be reduced.

[0262] A TAG (Timing advance group) may be a group of one or more serving cells. The serving cell or cells may be configured by the RRC. A serving cell may use one TA value. One or more serving cells may use one TA value. A timing reference cell may be used. A Primary TAG (PTAG) may be a TAG that includes an SpCell. A Secondary TAG (STAG) may be a TAG that does not include an SpCell. One or more serving cells may use two TA values.

[0263] A subTAG may be a group of one or more serving cells. A subTAG may be a group of serving cells using the same TA (TA value). For example, a subTAG may be associated with one TRP information. For example, a subTAG may be associated with one TRP. A serving cell associated with a subTAG may not be associated with a TAG. For example, a subTAG may be configured for one serving cell. For example, a serving cell associated with a subTAG may be associated with a TAG. A subTAG may be a group of one or more TRPs. A subTAG may be a group of TRPs using the same TA (TA value). For example, a subTAG may be associated with one serving cell.

[0264] The RRC layer may configure one or more higher layer parameters for maintenance of uplink time alignment. For example, the RRC layer may configure a time alignment timer. For example, the time alignment timer may be configured by a higher layer parameter timeAlignmentTimer. The time alignment timer may control a first time. The first time may be a time at which the MAC entity considers that multiple serving cells belong to the associated TAG. For example, the time alignment timer may be a time for uplink time alignment. That is, the time alignment timer being operational may mean that time synchronization is performed. That is, the time synchronization may mean that uplink timing is determined (or adjusted). That is, the TA may perform time synchronization.

[0265] The RRC layer may configure one or more higher layer parameters for maintaining uplink time synchronization. For example, the RRC layer may configure time synchronization timers. At least one of the multiple time synchronization timers may be associated with the subTAG. At least one of the synchronization timers may be associated with a TAG.

[0266] The time synchronization timer may correspond to one subTAG. For example, the time synchronization timer may be the time at which the MAC entity considers one or more serving cells to belong to the subTAG. For example, a time synchronization timer may control the time that a MAC entity considers one or more TRPs to belong to a subTAG.

[0267] The MAC entity may perform some or all of the first through fourth steps. stomach.

[0268] In the first process, a TA command MAC CE (Timing advance command MAC CE) is received, and then N TA is held in the indicated TAG, the MAC entity shall In the first process, a TA command MAC CE (Timing advance command MAC CE) is received and N TA If the TA command is held in the indicated TAG, the MAC entity may start or restart a time synchronization timer associated with the indicated TA command. The time synchronization timer may be a timeAlignmentTimer.

[0269] The second process is when the TA command is a random access response ( The second process may be a process when the TA command is received. The second process may be a process in a serving cell belonging to one TAG (or subTAG). The second process may be a process in an SpCell. In the second process, if a random access preamble is not selected from preambles in CBRA (Contention-based random access), the MAC entity selects a random access preamble for one TAG (or subTAG). A TA command may be applied to the TAG to initiate or restart a time synchronization timer associated with one TAG (or subTAG). The TA command may be received by a random access response.

[0270] In the second process, when a time synchronization timer associated with a TAG (or subTAG) is not running, the MAC entity may apply a TA command for a TAG (or subTAG) and may start the time synchronization timer. Furthermore, if contention resolution is not completed successfully, the MAC entity may stop the time synchronization timer.

[0271] In the second process, if a random access preamble is selected from the preambles in the CBRA and if a time synchronization timer associated with a TAG (or subTAG) is running, the MAC entity may ignore a received TA command.

[0272] In a third process, if an Absolute Timing Advance Command is received for a Message A (MSGA) transmission containing a C-RNTI MAC CE, the MAC entity may apply the absolute TA command for the PTAG and may start or restart a time synchronization timer associated with the PTAG.

[0273] The fourth operation may be an operation when the time synchronization timer expires. In the fourth operation, if the time synchronization timer is associated with the PTAG (or subTAG associated with the first TRP), the MAC entity may perform some or all of the first to seventh suboperations. The first suboperation may be to flush all HARQ buffers for all serving cells. The second suboperation may be to inform the RRC to release PUCCH for all serving cells. The third suboperation may be to inform the RRC to release SRS for all serving cells. The fourth suboperation may be to clear the configured downlink assignments and the configured uplink grants. The fifth suboperation may be to clear PUSCH resources for semi-persistent CSI reporting. The sixth suboperation may be to consider all time synchronization timers as expired. The seventh suboperation may be to clear N for all TAGs (or subTAGs). TA That is, if the time synchronization timer is not running, the MAC entity may maintain N TAIn the fourth process, if the time synchronization timer is associated with the STAG (or the subTAG associated with the second TRP), the MAC entity may perform some or all of the eighth to thirteenth suboperations. The eighth suboperation may be to flush all HARQ buffers for serving cells belonging to this TAG (or this subTAG). The ninth suboperation may be to inform the RRC to release PUCCH for serving cells belonging to this TAG (or this subTAG). The tenth suboperation may be to inform the RRC to release SRS for serving cells belonging to this TAG (or this subTAG). The eleventh suboperation may be to clear configured downlink assignments and configured uplink grants for serving cells belonging to this TAG (or this subTAG). A twelfth sub-operation may be to clear PUSCH resources for semi-static CSI reporting for serving cells belonging to this TAG (or this subTAG). A thirteenth sub-operation may be to clear N PUSCH resources for semi-static CSI reporting for serving cells belonging to this TAG (or this subTAG). TA It may also be to maintain.

[0274] The HARQ buffer may store MAC PDUs for transmission. A HARQ process may be associated with one HARQ process. One HARQ process may correspond to one HARQ process ID. Flushing a HARQ buffer may result in the HARQ buffer becoming empty. When a HARQ entity requests a new transmission for a transport block, the HARQ process may store the MAC PDU in the associated HARQ buffer.

[0275] Maximum uplink transmission timing difference If the MAC entity stops uplink transmission for the SCell because The identity may consider the time synchronization timer to expire upon stopping. The time synchronization timer may be a time synchronization timer associated with the SCell.

[0276] If the time synchronization timer expires, the MAC entity shall not perform any uplink transmission. If the time synchronization timer is not running, the MAC entity The uplink transmission may not include a random access preamble transmission. The uplink transmission may not include a message A transmission. This uplink transmission may be an uplink transmission in one serving cell. The uplink transmission may be an uplink transmission in one TRP. The time synchronization timer may be a time synchronization timer associated with a TAG to which one serving cell belongs. The time synchronization timer may be a time synchronization timer associated with a subTAG to which one serving cell belongs. The time synchronization timer may be a time synchronization timer associated with a subTAG to which one TRP belongs.

[0277] If the time synchronization timer associated with one subTAG expires, the MAC entity The entity performs uplink transmission for one or more TRPs included in the one subTAG. The uplink transmission may not include a random access preamble transmission and / or a message A transmission. For example, the time synchronization timer associated with one TRP may include a random access preamble transmission and / or a message A transmission. If the metric expires, the MAC entity shall not transmit uplink for that TRP. It is not necessary to execute it.

[0278] If the time synchronization timer associated with the PTAG is not running, the MAC entity In the serving cell, the MAC entity does not need to perform uplink transmission. This uplink transmission may not include a random access preamble transmission in the SpCell. This uplink transmission may not include a message A transmission in the SpCell.

[0279] A MAC PDU (Protocol Data Unit) is a byte-aligned bit string. g). A MAC PDU may be a transport block. For example, a MAC PDU may consist of one or more MAC subPDUs. Each MAC subPDU may be a MAC subheading. Each MAC subPDU may consist of one MAC subheader and one MAC SDU (Service Data Unit). Each MAC subPDU may be composed of one MAC subheader and one MAC Control Element (CE). Each MAC subPDU may be composed of one MAC header and padding. A MAC SDU may be data from a higher layer. A MAC SDU may be data to a higher layer.

[0280] The TA command may be a MAC CE. Also, the TA command may be included in a MAC CE. For example, the TA command may be included in a TA command MAC CE. The TA command MAC CE may be composed of a TAG ID and a TA command. The TAG ID may indicate one TAG and / or one subTAG. A TAG including a SpCell may correspond to TAG ID 0. The TAG ID may be indicated by 2 bits. The TAG ID may indicate one subTAG. The TAG ID may indicate one TRP. The TA command may be composed of a TAG ID and a TA command. The TAG ID may indicate one TAG and / or one subTAG. A TAG including a SpCell may correspond to TAG ID 0. The TAG ID may be indicated by 2 bits. The TAG ID may indicate one subTAG. The TAG ID may indicate one TRP. A T A can be an integer between 0 and 63. A may be used to control the amount of timing adjustment. The timing adjustment may be applied by the MAC entity. The TA command may be indicated by 6 bits. The TA command MAC CE may be identified by a MAC subheader with a certain LCID (Logical channel ID). The certain LCID may be the LCID corresponding to index 61.

[0281] The TA command may be included in an absolute Timing advance command MAC CE. The absolute Timing advance command MAC CE may consist of a reserved bit and a TA command. The TA command may be included in an absolute Timing advance command MAC CE. A T A may be used to control the amount of timing adjustment. The TA command may be indicated by 12 bits. The reserved bits may be 4 bits. The reserved bits may be set to value 0. The absolute TA command MAC CE may consist of at least a TAG ID. The TAG ID may indicate one subTAG. The TAG ID may indicate one TRP. The absolute TA command MAC CE may consist of at least a TAG ID. The TAG ID may indicate one TRP. , may be identified by a MAC subheader with an eLCID. The corresponding eLCID may be the eLCID in the address space 316.

[0282] The TA command may be included in the random access response. For example, the TA command may be included in the MAC payload of the random access response. For example, the TA command may be included in the MAC payload of the random access response. A T A may be used to control the amount of timing adjustment. The size of the TA command field may be 12 bits. The random access response may be composed of a TA command, an uplink grant, and a Temporary C-RNTI. The uplink grant may indicate resources used in the uplink. The uplink grant field may be 27 bits. The Temporary C-RNTI may indicate a temporary ID used by the MAC entity during random access. The Temporary C-RNTI field may be 16 bits. The random access response may be a MAC RAR. For example, the random access response may be a fallbackRAR. The TA command may be included in a message B (MSGB). For example, the TA command may be included in the MAC payload of the message B. The TA command may be included in a successRAR. The random access response may also include TRP information. For example, a TA corresponding to one TRP identified by the TRP information may be indicated by the TA command included in the random access response. As the TRP information, the random access response may include an index of a CORSET resource pool.

[0283] Also, multiple TA commands may be specified in one random access response. For example, when sending two TA commands in one random access response, the first TA command and the second TA command may indicate the TA commands for each TRP. In this case, the first TA command and the second TA command may be indicated by separate fields included in the random access response. is indicated by a single field in the random access response, and the value of the field A first TA command and a second TA command corresponding to (bit string, index) may be associated with each other (joint coding). Also, the second TA command may be defined as a difference of the first TA command.

[0284] Random access (or the random access procedure) is initiated by the MAC entity. The random access may be initiated by a PDCCH order (or PDCCH). The random access may be initiated by RRC. The random access in the SCell may be initiated by a PDCCH order. The random access may also be triggered by the MAC entity. The random access may be initiated by a PDCCH order. The random access may be triggered by the RRC.

[0285] For example, the random access may be triggered by an event. For example, an event may be an initial access from an RRC_IDLE state. For example, an event may be an RRC connection re-establishment procedure. For example, an event may be arrival of uplink or downlink data in an RRC_CONNECTED state when the uplink synchronization state is 'non-synchronised'. For example, an event may be arrival of uplink data in an RRC_CONNECTED state when there are no PUCCH resources. For example, an event may be a failure of a scheduling request. For example, an event may be a request by RRC in response to a handover. For example, an event may be an RRC connection resume. For example, an event may be establishing time alignment. For example, an event may be establishing time alignment for a STAG. For example, an event may be establishing time alignment for a TRP. For example, an event may be requesting Other SI. For example, an event may be a beam failure recovery. For example, an event may be the acquisition of a TA.

[0286] The random access (random access type) may be a 4-step-random access (4-step-random access type). The 2-step random access type may be a 2-step random access type. The random access may support Contention-based random access (CBRA). That is, the random access may be CBRA. The random access may support Contention-free random access (CFRA). That is, the random access may be CFRA. For example, the random access may be a 4-step random access type of CBRA. For example, the random access may be a 4-step random access type of CFRA. For example, the random access may be a 2-step random access type of CBRA. For example, the random access may be a 2-step random access type of CFRA.

[0287] In the four-step random access type CBRA, terminal device 1 sends message 1 (random In a two-step random access type of CBRA, the terminal device 1 may transmit message A (random access preamble), receive message 2 (random access response), transmit message 3, and receive message 4 (contention resolution). In a four-step random access type of CFRA, the terminal device 1 may receive an allocation of a random access preamble, transmit a random access preamble, and receive a random access response. In a two-step random access type of CFRA, the terminal device 1 may receive an allocation of a random access preamble and a PUSCH, transmit a random access preamble and a PUSCH, and receive a random access response.

[0288] If the CFRA resource is not configured, the RSRP (Reference signal received power) is used to select between the 2-step random access type and the 4-step random access type. A threshold may be used. 4 Step-Random Access Type CFRA Resource When the random access is set, the terminal device 1 uses the 4-step random access type random access When a CFRA resource of a two-step-random access type is configured, the terminal device 1 may perform a random access of a two-step-random access type. stomach.

[0289] Message 1 may be configured with one preamble in the PRACH. After transmitting message 1, the terminal device 1 may transmit one response (random access response) within a set window. In CFRA, a dedicated preamble is assigned. In the CFRA, in response to receiving the random access response, the terminal device 1 In the CBRA, in response to receiving the random access response, the terminal device 1 may transmit a message 3. For example, the terminal device 1 may transmit the message 3 in response to the reception of the random access response. Message 3 may be sent using the random access response grant. In CBRA, the terminal device 1 may monitor message 4 (contention resolution). If contention resolution after transmission is not successful, terminal device 1 may transmit message 1.

[0290] Message A may include one preamble in PRACH. Message A may also include a payload in PUSCH. After transmitting message A, the terminal device 1 may monitor one response within a set window. In CFRA, a dedicated preamble and PUSCH resource for transmitting message A may be allocated. In CFRA, in response to receiving one response, the terminal device 1 may terminate the random access. In CBRA, if contention resolution is successful, the terminal device 1 may terminate the random access. If a fallback indication is received in message B, the terminal device 1 may transmit message 3 based on the fallback indication and monitor contention resolution. If contention resolution after transmitting message 3 is not successful, the terminal device 1 may transmit message A. If the random access of the 2-step-random access type is not completed, the terminal device 1 may be configured to switch to the 4-step-random access type CBRA.

[0291] In the MAC entity, only one random access may be in progress at the same time. If the first random access is in progress and the second random access is triggered, the terminal device 1 may continue with the first random access. If in progress and if a second random access is triggered, the terminal device 1 may initiate the second random access.

[0292] For random access, RRC may request some or all of the first through eighth higher layer parameters. A first set of PRACH occasions for message 1 (random access preamble) transmission may be configured by a first higher layer parameter. The first set may be used for message A PRACH. A second set of PRACH occasions for random access preamble transmission for message A may be configured by a second higher layer parameter. The PRACH opportunity may be set by a meter. The PRACH opportunity may be referred to as an RA opportunity. The PRACH opportunity may be referred to as a RACH opportunity (RACH occasion).

[0293] The power of the random access preamble may be set by a third higher layer parameter. For example, the power of the initial random access preamble may be set by a third higher layer parameter. It may be set by a parameter.

[0294] The RSRP threshold may be set by a fourth higher layer parameter. For example, the RSRP threshold may be an RSRP threshold for SS / PBCH block selection or CSI-RS selection. For example, the RSRP threshold may be an RSRP threshold for selection between two uplink carriers. The two uplink carriers may be a normal uplink (NUL) and a supplementary uplink (SUL).

[0295] The maximum number of transmissions of message 1 and / or message A may be set by a fifth higher layer parameter. One or both of message 1 and message A may change transmission power for each transmission. For example, the power of one or both of message 1 and message A may be changed based on the sixth higher layer parameter. The sixth higher layer parameter may be a power ramping factor.

[0296] The random access preamble may be configured by the seventh higher layer parameter. For example, an index of the random access preamble used in the PRACH opportunity may be configured by the seventh higher layer parameter. The seventh higher layer parameter may indicate any value from 0 to 63.

[0297] The number of SS / PBCH blocks mapped to each PRACH opportunity may be defined by an eighth higher layer parameter. The number of ambles may be defined by an eighth higher layer parameter. The CBRA random access preamble may be a Contention-based Random Access Preamble. The transmission of message 1 and / or message A is performed by group A or group B. For example, the terminal device 1 may transmit a message A using the random access preamble group A. For example, the terminal device 1 may transmit a message A using the random access preamble group B. may be executed.

[0298] Random access (random access procedure) is initiated in one serving cell When the MAC entity receives the message 3, the MAC entity may flush the message 3 buffer, may flush the message A buffer, and may select a carrier for performing random access. The RDMA may determine a random access type, and may perform a Random Access Resource selection procedure.

[0299] The MAC entity allocates power for each random access type based on a counter. The MAC entity may calculate the RA-RNTI associated with the PRACH opportunity on which the random access preamble is transmitted. The MAC entity may determine the selected PRACH opportunity. The PRACH may be used to indicate to the physical layer that a random access preamble should be transmitted. The RA-RNTI associated with the opportunity is the index of the first OFDM symbol of the PRACH opportunity and one system The PRACH opportunity index may be calculated based on some or all of the following: the index of the first slot of the PRACH opportunity in the system frame, the index of the PRACH opportunity in the frequency domain, and the uplink carrier on which the random access preamble is transmitted.

[0300] The MAC entity shall determine the first window count from the end of the random access preamble transmission. The random access preamble may be a Contention-free Random Access Preamble (CFRA Random Access Preamble). The random access preamble may be a Contention-based Random Access Preamble (CBRA Random Access Preamble). The MAC entity may monitor the PDCCH for a random access response. For example, the MAC entity may monitor the PDCCH while the first window is running. The PDCCH may be a PDCCH in the SpCell. An indication of reception of the PDCCH may be received from the physical layer. The PDCCH transmission may be addressed to the C-RNTI. If the CFRA random access preamble is transmitted by the MAC entity, the MAC entity may consider the random access to be successfully completed.

[0301] A valid downlink assignment may be received on a PDCCH corresponding to the RA-RNTI. The received transport block may be decoded. The random access response may include a MAC subPDU. The MAC subPDU may be accompanied by a random access preamble ID. Based at least on the random access response including the MAC subPDU, the MAC entity determines that reception of the random access response was successful. It may be regarded as such.

[0302] The MAC entity MAY consider receipt of the Random Access Response successful. Based at least on the deemed successful receipt of the random access response, the MAC entity may consider the random access to have been successfully completed and may indicate the receipt of an acknowledgement to upper layers and may apply the received TA command. For example, the MAC entity may process the value of the received UL grant. For example, the MAC entity may indicate the received UL grant to the physical layer.

[0303] If the random access response is considered to be received successfully, and one service is When a random access preamble is transmitted in the receiving cell, the MAC entity The TA command may be processed for one serving cell. The reception of the random access response is considered successful and the random access command is processed for one serving cell. Based at least on the dumb access preamble being transmitted, A random access resource may apply a TA command for one serving cell. Based at least on the response being considered successful, the MAC entity shall For example, if a MAC PDU contains a TA command (e.g. For example, if the MAC PDU includes an absolute TA command MAC CE, the MAC entity may process the TA command. For example, the MAC PDU may be included in a transport block. For example, one or more MAC SDUs may be multiplexed into the transport block. For example, one or more MAC SDUs may be demultiplexed from the transport block.

[0304] Before the start of random access (physical random access procedure), the physical layer may receive a set of SS / PBCH block indexes from the upper layer and may provide a set of RSRP measurements to the upper layer. Before the start of random access, the physical layer may instruct the upper layer to perform type 1-random access. Before the start of random access, the physical layer may instruct the upper layer to perform type 2-random access. The type 1-random access may be a 4-step-random access type of random access. The type 2-random access may be a 2-step-random access type of random access. Before the start of random access, the physical layer may receive one or more parameters from the upper layer. The one or more parameters may include a configuration of PRACH transmission parameters. The PRACH transmission parameters may be a PRACH preamble format, a time resource, or a frequency resource for PRACH transmission. The one or more parameters may include a parameter for determining a root sequence. The one or more parameters may include a parameter for determining a cyclic shift in a PRACH preamble sequence (a sequence of a random access preamble). The one or more parameters may include TRP information, for example, one random access preamble may be associated with one TRP.

[0305] Random access is achieved by at least transmitting message 1 and message 2 on the PRACH. The random access may include a transmission of message 1 on the PRACH, a transmission of message 2, a PUSCH scheduled by a random access response uplink grant, and a PDSCH for contention resolution. The message 1 may be a random access preamble. The message 2 may be a random access response message (random access response). For example, the message 2 may be a random access response accompanied by a PDCCH / PDSCH. The random access procedure may be referred to as random access.

[0306] The random access may include at least the transmission of a message A and the reception of a message B. The random access may include the transmission of a message A, the reception of a message B, the transmission of a PUSCH scheduled by a random access response grant, and contention resolution. The message A may include a PDSCH for the random access program in the PRACH. The message B may be a preamble and a PUSCH. The message B may be a random access response. For example, the message B may be a random access response with a PDCCH / PDSCH. The random access response grant may be a fallback random access response grant.

[0307] If random access is initiated by a PDCCH order, the PRACH transmission (random access The TRP (pre-preamble transmission) may have the same subcarrier spacing as the PRACH transmission initiated by the higher layer. If two uplink carriers are configured in one serving cell and the terminal device 1 detects a PDCCH order, the terminal device 1 may use the value of the UL / SUL indication field from the detected PDCCH order to determine one uplink carrier for the PRACH transmission. If N TRPs are configured in one serving cell, If so, and if the terminal device 1 detects a PDCCH order, the terminal device 1 may determine one TRP for PRACH transmission by using one field (or field number) of the detected PDCCH order. field value) may be used.

[0308] The random access may be triggered by a higher layer or a PDCCH order in response to a request for a PRACH transmission. The configuration by the higher layer for the PRACH transmission may include some or all of the following: a configuration for the PRACH transmission, a preamble index (index of the random access preamble), a preamble SCS (subcarrier spacing of the random access preamble), a RA-RNTI, a PRACH resource, and TRP information.

[0309] The random access preamble may be a contention-based preamble. The dumb access preamble may be a contention-free preamble. The number of contention-based preambles per opportunity and per SS / PBCH block index may be configured by higher layer parameters. The PRACH opportunity may be enabled. For example, Based at least on the OFDM symbols configured for time division duplex, the PRACH opportunity is It may be effective.

[0310] Terminal device 1 decodes DCI format 1_0 with CRC scrambled with RA-RNTI For example, in response to a PRACH transmission, the terminal device 1 may attempt to decode DCI format 1_0 with CRC scrambled with RA-RNTI within a certain window. A certain window may be opened based on at least the first OFDM symbol of the CORESET. It may be started.

[0311] Terminal device 1 detects DCI format 1_0 with scrambled CRC in RA-RNTI. and, based at least on the terminal device 1 receiving the transport block, The terminal device 1 may pass the transport block to a higher layer. A PRACH transmission may be received on the PDSCH within a window. Higher layers may parse a transport block corresponding to a Random access preamble identity (RAPID) associated with the PRACH transmission. To identify RAPID in a response (random access response message), The upper layer may indicate an uplink grant (random access response grant) to the physical layer. The random access response may be a random access response of a transport block. The random access response grant may be a random access response uplink grant.

[0312] Terminal device 1 transmits DCI format 1_0 with CRC scrambled by RA-RNTI. If the PDSCH transport block is not detected within the window, or If the PRACH is not received within 10 seconds, the higher layer may instruct the physical layer to transmit the PRACH. If the higher layers do not identify a RAPID associated with the PRACH transmission, the higher layers shall decide not to transmit the PRACH. For example, the terminal device 1 may indicate to the physical layer that the last OFDM symbol of the window The terminal device 1 may be expected to transmit the PRACH within a predetermined time from the last OFDM symbol of the PDSCH reception. Also, the terminal device 1 may be expected to transmit the PRACH within a predetermined time from the last OFDM symbol of the PDSCH reception. Transmitting the PRACH means transmitting a random access preamble. This is also possible.

[0313] The PDCCH order may trigger a contention-free random access procedure (CFRA). For example, the PDCCH order may trigger a CFRA in one SpCell. The reader may initiate a PRACH transmission. If a PDCCH with DCI format 1_0 with CRC scrambled by the RA-RNTI is attempted to detect in response to a PRACH transmission from a DMRS antenna, the PDCCH with DCI format 1_0 and the PDCCH with DCI format 1_0 are not transmitted from the same DMRS antenna. It may be assumed that the QCL characteristics of the port may be large-scale characteristics of the channel.

[0314] A random access response grant may consist of one or more fields. For example, one or more fields may include a frequency hopping flag field. For example, the one or more fields may include a frequency domain resource allocation field (or a PUSCH frequency resource allocation field). The number of fields may include a time domain resource allocation field (or a PUSCH time resource allocation field). For example, the one or more fields may include a transmission power control (TPC) command field. For example, the one or more fields may include a CSI request field. For example, the one or more fields may include a field with TRP information.

[0315] In order to improve the degree of freedom of terminal positioning, reduce interference, and expand coverage, the terminal device 1 is The problem is to determine uplink timing for each of the multiple transmission and reception points. For example, the means 1 may be used to solve this problem.

[0316] Means 1 according to one aspect of this embodiment will be described below.

[0317] The terminal device 1 transmits a first random access preamble in the first random access. The terminal device 1 may transmit the first random access The terminal device 1 may receive a second access response in the second random access. The terminal device 1 may transmit the second random access preamble. For example, when the first random access is initiated (triggered), the terminal device 1 may receive a first random access response. When the second random access is initiated (triggered), the terminal device 1 may transmit a second random access pattern and may receive a first random access response. A preamble may be transmitted and a second random access response may be received.

[0318] The terminal device 1 may transmit a first random access preamble based at least on the first TRP information. For example, the first random access preamble may be The terminal device 1 may receive a first random access response including the first TRP information. The terminal device 1 may transmit a second random access preamble based at least on the second TRP information. For example, the second random access preamble may correspond to the second TRP. The terminal device 1 may receive a second random access response including the second TRP information. For example, the first higher layer parameter may indicate that the first random access preamble is to be transmitted to the first TRP. For example, the second random access preamble is transmitted to the second TRP. The first higher layer parameter and the second higher layer parameter may be the same.

[0319] The random access response may include a TA command. For example, the first random access response may include a first TA command. For example, the second random access response may include a second TA command. The first TA command may be different from the second TA command. That is, the first TA command may be independent of the second TA command. The terminal device 1 may receive the first TA command. The terminal device 1 may receive the second TA command.

[0320] A first TA may be determined based on a first TA command. That is, a first uplink timing may be determined based on a first TA command. The first uplink timing may be the uplink timing between the terminal device 1 and the first TRP. A second TA may be determined based on a second TA command. That is, a second uplink timing may be determined based on a second TA command. The second uplink timing may be the uplink timing between the terminal device 1 and the second TRP. The uplink timing may be a TA.

[0321] The first TRP and the second TRP may be different TRPs. The first TRP and the second TRP may be higher-ranking TRPs. The first TRP and the second TRP may be determined by a higher layer parameter. If the higher layer parameter is not set, the second TRP is not present. It may be assumed that the first TRP is identified by a first ID (or index). The second TRP may be identified by a second ID (or index). The first ID and the second ID may be configured by a higher layer parameter. The first ID and the second ID may be included in a DCI format. The first ID and the second ID may be configured as a random access request. may be included in the PONSE.

[0322] The base station device 3 may be configured with a first TRP and a second TRP. For example, the base station device 3 may have two transmission / reception points (base station device 3a and base station device 3b). The first TRP may be the transmission / reception point of the base station device 3a. The second TRP may be the transmission / reception point of the base station device 3b. The base station device 3a may have the functions of the base station device 3, and may be independent of the base station device 3b. The base station device 3b may have the functions of the base station device 3, and may be independent of the base station device 3a. For example, the base station device 3a does not need to be synchronized with the base station device 3b. The TRP information may be used to select one of the base station device 3a and the base station device 3b.

[0323] The first TA command and the second TA command may apply to one serving cell. For example, the first TA command and the second TA command are applied simultaneously to one serving cell. For example, the first TA command and the second TA command may be sent to one serving cell. For example, the first TA command and the second TA command may be received in one server. For example, the first TA command and the second TA command may be TA commands for one TAG. For example, the first TA command and the second TA command may be TA commands for one time synchronization timer. That is, That is, the first TA command and the second TA command are one time-synchronized timer associated with one TAG. It may be a TA command for the

[0324] The first TA and the second TA may be applied to one serving cell. For example, the first TA The first TA and the second TA may be received in one serving cell. The second TA may be a TA for one serving cell. A first TA and a second TA may be used in one serving cell. The first TA may not be updated (changed) based on the second TA command. The second TA may not be updated (changed) based on the first TA command.

[0325] The first uplink timing and the second uplink timing are for one serving cell. For example, the first uplink timing and the second uplink timing may be received in one serving cell. The first uplink timing and the second uplink timing are the uplink timing for one serving cell. That is, the terminal device 1 may use the first uplink timing and the second uplink timing in one serving cell. The first uplink timing may not be updated (changed) based on the second TA command. The second uplink timing may not be updated (changed) based on the first TA command.

[0326] The terminal device 1 switches between the first uplink timing and the second uplink timing. For example, for one uplink transmission in one serving cell, the terminal device 1 may use one of the first uplink timing and the second uplink timing. For example, the terminal device 1 may correspond one of the first uplink timing and the second uplink timing to one uplink transmission based on the TRP information. The first uplink timing and the second uplink timing are determined based on the subTAG. For example, the terminal device 1 may correspond to one uplink transmission. For example, the terminal device 1 may correspond one of the first uplink timing and the second uplink timing to one uplink transmission based on an instruction from a layer (e.g., a MAC layer). For example, the terminal device 1 may select one of the first uplink timing and the second uplink timing. For example, the terminal device 1 may correspond one of the first uplink timing and the second uplink timing to one uplink transmission based on certain information. The information may be either TRP information or subTAG. The terminal device 1 may receive certain information or a parameter including certain information. Parameters containing certain information may be in either higher layer parameter or DCI format. It's fine.

[0327] The terminal device 1 may transmit, in one serving cell, a first uplink channel corresponding to a first uplink timing and a second uplink channel corresponding to a second uplink timing. The first uplink channel and the second uplink channel may be the same. For example, the first uplink channel transmission and the second uplink channel transmission may be the same. That is, the terminal device 1 may simultaneously transmit one uplink corresponding to the first uplink timing and the second uplink timing in one serving cell.

[0328] The first random access is CBRA and the second random access is CFRA. For example, the second random access may be triggered by a PDCCH order. One of the first random access and the second random access may be a CFRA. One of the first random access and the second random access may be initiated by a PDCCH order. For example, if the second random access is a CFRA, the second random access response may correspond to the first TRP. If so, the second random access preamble corresponds to a second TRP and the second random access preamble corresponds to a second TRP. The access response may correspond to a first TRP, i.e., the CFRA establishes a second TA. In other words, the CSS set may not be set for the second TRP.

[0329] The first random access may be a first CBRA and the second random access may be a second CBRA. The first random access and the second random access may not be performed simultaneously. For example, the first random access may be performed at the first SS / PBCH block index. The second random access may be based on some or all of the first SS / PBCH block index, the first SS / PBCH block, and the first SS / PBCH candidate. The second random access may be based on some or all of the second SS / PBCH block index, the second SS / PBCH block, and the second SS / PBCH candidate.

[0330] The first random access preamble may be transmitted to the first TRP. A dumb access preamble may be transmitted to the second TRP. For example, The access preamble is transmitted to the first TRP, as indicated by higher layer parameters. For example, a second random access preamble may be transmitted to a second TRP. This may be indicated by higher layer parameters.

[0331] One or both of the first TA and the first uplink timing may be determined based at least on the first TA offset and the first TA command. One or both of the second TA and the second uplink timing may be determined based at least on the second TA offset and the second TA command. The first TA offset and the second TA offset may be the same. For example, the first TA offset and the second TA offset may be set by one higher layer parameter. For example, if one higher layer parameter is not provided, the terminal device 1 may determine the first TA offset and the second TA offset as one value.

[0332] The first TA command may control the amount of a first timing adjustment (first uplink timing adjustment). The second TA command may control the amount of a second timing adjustment (second uplink timing adjustment). That is, the first TA command may control the amount of the first T A Instruct The second TA command may be A The first T A and the second T A may be different.

[0333] In response to receiving the first TA command, the terminal device 1 receives a first TA command for a first uplink transmission. In response to receiving the second TA command, the terminal device 1 may adjust (determine) the second uplink timing for the second uplink transmission. The uplink may be a PUSCH, a PUCCH, or an SRS. The first uplink may be transmitted in one serving cell, and the second uplink may be transmitted in the one serving cell.

[0334] Hereinafter, the medium access control layer processing unit 35 and the radio resource control layer processing unit 36 ​​in the means 1 will be described. The process will be explained.

[0335] The RRC layer sets a first time alignment timer and a second time alignment timer. For example, the RRC layer may set a first time synchronization time for one serving cell. The MAC entity may configure a first time synchronization timer and a second time synchronization timer. For example, the first time synchronization timer may be configured by a first upper layer parameter. For example, the second time synchronization timer may be configured by a second upper layer parameter. The first upper layer parameter and the second upper layer parameter may not be the upper layer parameter timeAlignmentTimer. The first time synchronization timer may control a first time. The first time may be a time at which the MAC entity considers that at least the first TRP belongs to the first subTAG. The second time synchronization timer may control a second time. The second time may be a time at which the MAC entity considers that at least the second TRP belongs to the second subTAG.

[0336] A first time synchronization timer may be started or restarted based at least on the first TA command. The first time synchronization timer may be associated with the first TRP. The synchronization timer may be associated with the first subTAG. The first subTAG may identify a first TRP from one or more TRPs. The first subTAG may include the first TRP. For example, the first subTAG may include one or more TRPs corresponding to the first TA. The first time synchronization timer may be associated with the first TAG. That is, the first time synchronization timer may be associated with the first subTAG and the first TAG. The third time synchronization timer may be associated with the first TAG.

[0337] A second time synchronization timer may be started or restarted based at least on the second TA command. The second time synchronization timer may be associated with a second TRP. The synchronization timer may be associated with a second subTAG. The second subTAG may identify a second TRP from the one or more TRPs. The second subTAG may include a second TRP. For example, the second subTAG may include one or more TRPs corresponding to a second TA. The second time synchronization timer may be associated with a second TAG. That is, the second time synchronization timer may be associated with the second subTAG and the second TAG. The first TAG and the second TAG may be the same. That is, the third time synchronization timer may be associated with the first TAG. For example, the first subTAG and the second subTAG may correspond to one serving cell.

[0338] The first time synchronization timer may be different from the second time synchronization timer. That is, the first time synchronization timer may be independent of the second time synchronization timer. For example, a first upper layer parameter that sets the first time synchronization timer may be independent of a second upper layer parameter that sets the second time synchronization timer. The MAC entity may The synchronization timer and the second time synchronization timer may be managed in parallel.

[0339] The second TA command may be included in a TA command MAC CE or an absolute TA command MAC CE. For example, the TA command MAC CE or the absolute TA command MAC CE may be included in a second TRP and , or the second subTAG. That is, the TA command MAC CE may include a field for identifying the TA command, the TAG ID, an ID for the second subTAG, and the second TRP. The absolute TA command may consist of the TRP information for and part or all of the MAC. The CE sends a TA command, a TAG ID, an ID for the second subTAG, and TRP information for the second TRP. The second TA may be determined based at least on the first TA and the second TA command.

[0340] A TA command MAC CE including a first TA command is received, and the first N TA If a TA command MAC CE is received that includes the first TA command and the first N TA is held in the first subTAG, the MAC entity may start or restart a first time synchronization timer associated with the first TA command.

[0341] A TA command MAC CE including a second TA command is received, and a second N TA is the first subTA If the second TA command is held in G, the MAC entity may apply the second TA command. If a TA command MAC CE containing the second TA command is received and the second N TA is held in the second subTAG If so, the MAC entity shall start a second time synchronization timer associated with the second TA command. The MAC entity may manage some or all of the first time synchronization timer, the second time synchronization timer, and the third time synchronization timer.

[0342] When the first time synchronization timer is not running, the MAC entity may apply a first TA command and start the first time synchronization timer. In addition, if contention resolution in the first random access is not completed successfully, If so, the MAC entity may stop the first time synchronization timer. When the synchronization timer is not running, the MAC entity may apply a second TA command and start a second time synchronization timer. Furthermore, if the contention resolution in the second random access is not completed successfully, the MAC entity may apply a second TA command and start a second time synchronization timer. The time synchronization timer may be stopped. The first time synchronization timer and the second time synchronization timer may be running simultaneously.

[0343] If the first random access preamble is selected from the preambles in the CBRA and the first time synchronization timer is running, the MAC entity may ignore the first TA command. If the second random access preamble is selected from the preambles in the CBRA and the second time synchronization timer is running, the MAC entity may ignore the second TA command.

[0344] The first time synchronization timer and the second time synchronization timer correspond to one serving cell. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may flush all HARQ buffers for one serving cell. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may notify the RRC to release the PUCCH for one serving cell. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may notify the RRC to release the SRS for one serving cell. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may clear the configured downlink assignment and the configured uplink grant. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may clear the PUSCH resources for semi-persistent CSI reporting. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may consider all time synchronization timers corresponding to one serving cell to have expired. If the first time synchronization timer expires, the MAC entity may consider the first N TA If the second time synchronization timer expires, the MAC entity may maintain a second N TA may be maintained.

[0345] If the first time synchronization timer is not running (expired), the MAC entity At the second time, the first uplink transmission may not be performed for at least the first TRP. If the inter-synchronization timer is not running (expired), the MAC entity shall The second uplink transmission may not be performed for the second TRP even if the first uplink transmission The first uplink transmission and the second uplink transmission are the random access preamble transmission and the message A transmission. You do not have to include either or both.

[0346] If at least the first random access response is successfully received, the MAC error An entity may process a first TA command for one serving cell. The first random access response is considered to be received successfully and one sub and based at least on the first random access preamble being transmitted for the serving cell, the MAC entity determines one or more of the one serving cell and the first TRP. The first TA command may be applied for both.

[0347] FIG. 9 will now be described.

[0348] In FIG. 9, the first TRP may be TRP3a (or base station device 3a). The second TRP may be TRP3b (or base station device 3b). The first TA command may be a TA command 900. The second TA command may be a TA command 901. The first uplink transmission may be an uplink transmission 910. The second uplink transmission may be an uplink transmission 911. One or both of the first TA and the first uplink timing may be uplink timing 920. One or both of the second TA and the second uplink timing may be uplink timing 921. One serving cell may be a serving cell 920.

[0349] FIG. 9 illustrates two uplink channels in one serving cell according to one aspect of the present embodiment. 9 is a diagram showing an example of a channel transmission. The terminal device 1 may perform uplink transmission 910 or uplink transmission 911 in a serving cell 930. In response to receiving a TA command 900, the terminal device 1 may adjust uplink timing 920 for transmitting the uplink transmission 910. In response to receiving a TA command 901, the terminal device 1 may adjust uplink timing 921 for the uplink transmission 911.

[0350] The terminal device 1 may receive a TA command 900 from the TRP 3a. The terminal device 1 may receive a TA command 901 from the TRP 3a or from the TRP 3b. For example, the terminal device 1 may receive a TA command 901 from the TRP 3a or from the TRP 3b. The TRP sends a random access preamble and a second random access preamble containing the TA command 901 from TRP 3a. The terminal device 1 may receive a random access response including a TA command 901 from the TRP 3b. In this case, the random access corresponding to the second random access preamble and the second random access response may be CFRA. In addition, the terminal device 1 may transmit a second random access preamble to the TRP 3b and receive a random access response including a TA command 901 from the TRP 3b. In this case, the random access corresponding to the second random access preamble and the second random access response may be CFRA or CBRA.

[0351] The first time synchronization timer and the second time synchronization timer are configured for the serving cell 920. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may flush all HARQ buffers for the serving cell 920. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may notify the RRC to release the PUCCH for the serving cell 920. If the first time synchronization timer or the second time synchronization timer expires, the MAC entity may notify the RRC to release the SRS for the serving cell 920.

[0352] Various aspects of the device according to one aspect of this embodiment will be described below.

[0353] (1) In order to achieve the above object, the aspects of the present invention take the following measures. That is, a first aspect of the present invention is a terminal device, comprising: a transmitter that transmits a first random access preamble in a first random access and transmits a second random access preamble in a second random access; and a receiver that receives a first TA command in the first random access and receives a second TA command in the second random access, and transmits a first uplink link based on at least the first TA command. The timing of the second TA command is adjusted in one serving cell. Also, a second uplink timing is adjusted in the one serving cell based on the and based on certain information, one of the first uplink timing and the second uplink timing is used. Also, the first random access may be CBRA, and the second random access may be CFRA. Also, the certain information may be either TRP information or subTAG, and the receiving unit may receive the certain information or a parameter including the certain information.

[0354] (2) A second aspect of the present invention is a base station device comprising: a receiving unit that receives a first random access preamble in a first random access and a second random access preamble in a second random access; and a transmitting unit that transmits a first TA command in the first random access and a second TA command in the second random access, wherein a first uplink timing is adjusted in one serving cell based on at least the first TA command, and a second uplink timing is adjusted in one serving cell based on at least the second TA command. Based on at least one of the above, a second uplink timing is adjusted in the one serving cell. and based on certain information, one of the first uplink timing and the second uplink timing is used.

[0355] (3) A third aspect of the present invention is a terminal device, and a radio resource control layer processing unit configured to set a first time synchronization timer and a second time synchronization timer, and a medium access control layer processing unit, wherein, based at least on a first TA command being received, the medium access control layer processing unit starts or restarts the first time synchronization timer, based at least on a second TA command being received, the medium access control layer processing unit starts or restarts the second time synchronization timer, and when the first time synchronization timer or the second time synchronization timer expires, the medium access control layer processing unit clears all HARQ buffers for the one serving cell. Flash.

[0356] (4) A fourth aspect of the present invention is a base station device, The wireless LAN base station includes a radio resource control layer processing unit that sets one time synchronization timer and a second time synchronization timer, and a medium access control layer processing unit, wherein, based at least on a first TA command being received, the medium access control layer processing unit starts or restarts the first time synchronization timer, and based at least on a second TA command being received, the medium access control layer processing unit starts or restarts the second time synchronization timer, and when the first time synchronization timer or the second time synchronization timer expires, the medium access control layer processing unit flushes all HARQ buffers for the one serving cell.

[0357] The programs operating in the base station device 3 and terminal device 1 according to the present invention may be programs (programs that make a computer function) that control a CPU (Central Processing Unit) or the like so as to realize the functions of the above-mentioned embodiments according to the present invention. Information handled by these devices is temporarily stored in a RAM (Random Access Memory) during processing. The data is then stored in various ROMs such as Flash ROM (Read Only Memory) or HDD (Hard Disk Drive), and is read, modified, and written by the CPU as necessary.

[0358] In addition, a part of the terminal device 1 and the base station device 3 in the above-mentioned embodiment may be realized by a computer. In that case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed to realize the control function.

[0359] The "computer system" here refers to a computer system built into the terminal device 1 or base station device 3, and includes hardware such as an OS and peripheral devices. Also, the "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into the computer system.

[0360] Furthermore, the term "computer-readable recording medium" may include a medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and a medium that stores a program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or client in such a case. The above program may be one that realizes part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0361] Furthermore, the base station device 3 in the above-described embodiment can also be realized as an aggregate (device group) consisting of a plurality of devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 according to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as an aggregate.

[0362] In addition, the base station device 3 in the above-mentioned embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). In addition, the base station device 3 in the above-mentioned embodiment may have a part or all of the functions of an upper node for an eNodeB and / or a gNB.

[0363] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiment may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chip set. Each functional block of the terminal device 1 and the base station device 3 may be individually integrated into a chip, or may be integrated into a chip in part or in whole. The integrated circuit method is not limited to LSI, but may be a dedicated circuit, It may also be realized by a general-purpose processor. Also, with the advancement of semiconductor technology, it may be possible to use a centralized processor that replaces LSI. When a technology for integrated circuitry emerges, it is also possible to use integrated circuits based on that technology.

[0364] In addition, in the above-described embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this and can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices installed indoors or outdoors, for example, AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0365] Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the gist of the present invention are also included. Furthermore, the present invention can be modified in various ways within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, configurations in which elements described in the above embodiments are replaced with elements that have the same effect are also included. [Explanation of symbols]

[0366] 1(1A, 1B, 1C) Terminal equipment 3 Base station equipment 10, 30 Radio transmitter / receiver 10a, 30a Wireless transmitter 10b, 30b Wireless receiver 11, 31 Antenna section 12, 32 RF section 13, 33 Baseband section 14, 34 Upper layer processing unit 15, 35 Media access control layer processing unit 16, 36 Radio resource control layer processing unit 91, 92, 93, 94 Search area set 300 Component Carriers 301 Primary Cell 302, 303 Secondary Cell A set of resource elements for 700 PSS 710, 711, 712, 713 Set of resource elements for PBCH and DMRS for PBCH 720 Set of Resource Elements for SSS 3000 points 3001, 3002 Resource Grid 3003, 3004 BWP 3011, 3012, 3013, 3014 offset 3100, 3200 common resource block set 900, 901 TA Command 910, 911 Uplink transmission 920, 921 Uplink Timing 930 Serving Cell

Claims

1. Configure a first time synchronization timer and a second time synchronization timer for one serving cell. A radio resource control layer processing unit for determining A medium access control layer processing unit, Based at least on the first TA command being received, the media access control layer processing unit starts or restarts the first time synchronization timer; Based at least on the second TA command being received, the media access control layer processing unit starts or restarts the second time synchronization timer; When the first time synchronization timer or the second time synchronization timer expires, the medium access control layer processing unit Flush the buffer Terminal device.

2. Configure a first time synchronization timer and a second time synchronization timer for one serving cell. A radio resource control layer processing unit for determining A medium access control layer processing unit, Based at least on the first TA command being received, the media access control layer processing unit starts or restarts the first time synchronization timer; Based at least on the second TA command being received, the media access control layer processing unit starts or restarts the second time synchronization timer; When the first time synchronization timer or the second time synchronization timer expires, the medium access control layer processing unit Flush the buffer Base station equipment.

3. A communication method used in a terminal device, In a radio resource control layer processing unit, a first time synchronization timer is set for one serving cell. a first step of configuring a timer and a second time-synchronized timer; a second step in a medium access control layer processing unit, In the first step, based at least on receiving a first TA command, the media access control layer processing unit starts or restarts the first time synchronization timer; In the first step, based at least on receiving a second TA command, the media access control layer processing unit starts or restarts the second time synchronization timer; In the first step, when the first time synchronization timer or the second time synchronization timer expires, the medium access control layer processing unit Flush all HARQ buffers for the Communication methods.

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