Patent Application
20240137935
The present invention relates to a terminal apparatus, a base station apparatus, and a communication method.
This application claims priority to JP 2021-028481 filed on Feb. 25, 2021, the contents of which are incorporated herein by reference.
In the 3rd Generation Partnership Project (3GPP), a radio access method and a radio network for cellular mobile communications (hereinafter also referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio Access (EUTRA)”) have been studied. In LTE, a base station apparatus is also referred to as an evolved NodeB (eNodeB) and a terminal apparatus is also referred to as a User Equipment (UE). LTE is a cellular communication system in which multiple areas covered by base station apparatuses are arranged in a form of cells. A single base station apparatus may manage multiple serving cells.
The 3GPP has been studying a next generation standard (New Radio or NR) (NPL 1) to make a proposal for International Mobile Telecommunication (IMT)-2020, a standard for a next generation mobile communication system developed by the International Telecommunication Union (ITU). NR is to be satisfy requirements for three scenarios including enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) in a single technology framework.
In the 3GPP, extension of services supported by NR has been studied (NPL 2).
NPL 1: “New SID proposal: Study on New Radio Access Technology”, RP-160671, NTT docomo, 3GPP TSG RAN Meeting #71, Goteborg, Sweden, 7-10 March, 2016.
NPL 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
An aspect of the present invention provides a terminal apparatus that efficiently performs communication, a communication method used for the terminal apparatus, a base station apparatus that efficiently performs communication, and a communication method used for the base station apparatus.
(1) A first aspect of the present invention is a terminal apparatus and includes a reception circuitry that receives a PDCCH including a DCI format; and a transmission circuitry that transmits a PUCCH. The DCI format indicates transmission of the PUCCH. A first higher layer parameter NrofSlots indicating a first number of repetitions is configured for a PUCCH format corresponding to the transmission of the PUCCH and/or a second higher layer parameter RepetitionFactor-r17 indicating a second number of repetitions is configured for a PUCCH resource corresponding to the transmission of the PUCCH. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is not configured, the number of repetitions of the PUCCH is the first number of repetitions. In a case that the NrofSlots is not configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions.
(2) A second aspect of the present invention is a base station apparatus and includes a transmission circuitry that transmits a PDCCH including a DCI format; and a reception circuitry that receives a PUCCH. The DCI format indicates transmission of the PUCCH. A first higher layer parameter NrofSlots indicating a first number of repetitions is configured for a PUCCH format corresponding to the transmission of the PUCCH and/or a second higher layer parameter RepetitionFactor-r17 indicating a second number of repetitions is configured for a PUCCH resource corresponding to the transmission of the PUCCH. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is not configured, the number of repetitions of the PUCCH is the first number of repetitions. In a case that the NrofSlots is not configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions.
(3) A third aspect of the present invention is a communication method used for a terminal apparatus and includes the steps of receiving a PDCCH including a DCI format; and transmitting a PUCCH. The DCI format indicates transmission of the PUCCH. A first higher layer parameter NrofSlots indicating a first number of repetitions is configured for a PUCCH format corresponding to the transmission of the PUCCH and/or a second higher layer parameter RepetitionFactor-r17 indicating a second number of repetitions is configured for a PUCCH resource corresponding to the transmission of the PUCCH. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is not configured, the number of repetitions of the PUCCH is the first number of repetitions. In a case that the NrofSlots is not configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions.
(4) A fourth aspect of the present invention is a communication method used for a base station apparatus, is a communication method used for a base station apparatus, and includes the steps of transmitting a PDCCH including a DCI format; and receiving a PUCCH. The DCI format indicates transmission of the PUCCH. A first higher layer parameter NrofSlots indicating the first number of repetitions is configured for a PUCCH format corresponding to the transmission of the PUCCH and/or a second higher layer parameter RepetitionFactor-r17 indicating the second number of repetitions is configured for a PUCCH resource corresponding to the transmission of the PUCCH. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is not configured, the number of repetitions of the PUCCH is the first number of repetitions. In a case that the NrofSlots is not configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions.
According to an aspect of the present invention, the terminal apparatus can efficiently perform communication. The base station apparatus can efficiently perform communication.
An embodiment of the present invention will be described below.
floor(C) may be a floor function for a real number C. For example, floor(C) may be a function that outputs a maximum integer in a range of not exceeding the real number C. ceil(D) may be a ceiling function for a real number D. For example, ceil(D) may be a function that outputs a minimum integer in a range of not falling below the real number D. mod(E, F) may be a function that outputs a remainder obtained by dividing E by F. mod(E, F) may be a function that outputs a value corresponding to the remainder obtained by dividing E by F. exp(G)=e{circumflex over ( )}G. Here, e is a Napier's constant. H{circumflex over ( )}I represents H to the power of I. max(J, K) is a function that outputs a maximum value out of J and K. Here, in a case that J and K are equal, max(J, K) is a function that outputs J or K. min(L, M) is a function that outputs a maximum value out of L and M. Here, in a case that L and M are equal, min(L, M) is a function that outputs L or M. round(N) is a function that outputs an integer value of a value closest to N.
In the radio communication system according to an aspect of the present embodiment, at least Orthogonal Frequency Division Multiplex (OFDM) is used. The OFDM symbol is a time domain unit of the OFDM. The OFDM symbol includes at least one or multiple subcarriers. The OFDM symbol is converted into a time-continuous signal in baseband signal generation. In a downlink, at least Cyclic Prefix—Orthogonal Frequency Division Multiplex (CP-OFDM) is used. In an uplink, either CP-OFDM or Discrete FourierTransform—spread—Orthogonal Frequency Division Multiplex (DFT-s-OFDM) is used. DFT-s-OFDM may be given by applying Transform precoding to the CP-OFDM.
The OFDM symbol may be a term including a CP added to the OFDM symbol. That is, a certain OFDM symbol may include the certain OFDM symbol and the CP added to the certain OFDM symbol.
The base station apparatus 3 may include one or multiple transmission apparatuses (or transmission points, transmission and/or reception apparatuses, transmission and/or reception points). In a case that the base station apparatus 3 includes multiple transmission apparatuses, the multiple transmission apparatuses may be arranged at different positions.
The base station apparatus 3 may provide one or multiple serving cells. Each serving cell may be defined as a set of resources used for radio communication. The serving cell is also referred to as a cell.
The serving cell may include at least one downlink component carrier (downlink carrier) and/or one uplink component carrier (uplink carrier). The serving cell may include at least two or more downlink component carriers, and/or two or more uplink component carriers. The downlink component carrier and the uplink component carrier are also referred to as a component carrier (carrier).
For example, for one component carrier, one resource grid may be given. For one component carrier and a certain subcarrier spacing configuration μ, one resource grid may be given. Here, the subcarrier spacing configuration μ is also referred to as numerology. The resource grid includes Nsize, μgrid, xNRBsc subcarriers. The resource grid starts from a common resource block Nstart, μgrid, x. The common resource block Nstart, μgrid, x is also referred to as a reference point of the resource grid. The resource grid includes Nsubframe, μsymb OFDM symbols. x is a subscript indicating a transmission direction and indicates either of a downlink or an uplink. For a set of a certain antenna port p, a certain subcarrier spacing configuration μ, and a certain transmission direction x, one resource grid is given.
Nsize,μgrid, x and Nstart, μgrid, x are given based at least on a higher layer parameter (CarrierBandwidth). The higher layer parameter is also referred to as an SCS specific carrier. One resource grid corresponds to one SCS specific carrier. One component carrier may include one or multiple SCS specific carriers. The SCS specific carrier may be included in system information. For each of the SCS specific carriers, one subcarrier spacing configuration μ may be given.
The SubCarrier Spacing (SCS) Δf may be Δf=2μ·15 kHz. For example, the subcarrier spacing configuration μ may indicate one of 0, 1, 2, 3, or 4.
In the radio communication system according to an aspect of the present embodiment, time unit Tc may be used for expression of the length of the time domain. The time unit Tc is Tc=1/(Δfmax·Nf). Δfmax=480 kHz. Nf=4096. A constant κ is κ=Δfmax·Nf/(ΔfrefNf, ref)=64. Δfref is 15 kHz. Nf, ref is 2048.
Transmission of a signal in the downlink and/or transmission of a signal in the uplink may be organized into a radio frame (system frame, frame) having the length Tf. Tf=(ΔfmaxNf/100)·Ts=10 ms. “⋅” represents multiplication. The radio frame includes 10 subframes. The length Tsf of the subframe is (ΔfmaxNf/1000)·Ts=1 ms. The number of OFDM symbols per subframe is Nsubframe, μsymb=NslotsymbNsubframe, μslot.
For a certain subcarrier spacing configuration μ, the number and indices of slots included in the subframe may be given. For example, slot indices nμs may be given in ascending order in the subframe with integer values within a range of 0 to Nsubframe, μslot−1. For the subcarrier spacing configuration μ, the number and indices of slots included in the radio frame may be given. Slot indices nμs, f may be given in ascending order in the radio frame with integer values within a range of 0 to Nframe, μslot−1. Nslotsymb consecutive OFDM symbols may be included in one slot. Nslotsymb is 14.
The component carrier 300 is a band having a predetermined width in the frequency domain.
A Point 3000 is an identifier for identifying a certain subcarrier. The point 3000 is also referred to as a point A. A Common resource block (CRB) set 3100 is a set of common resource blocks for the subcarrier spacing configuration μ1.
In the common resource block set 3100, a common resource block (block hatched with lines rising diagonally up and to the right in
An offset 3011 is an offset from the reference point of the common resource block set 3100 to a reference point of a resource grid 3001. The offset 3011 is represented by the number of common resource blocks for the subcarrier spacing configuration μ1. The resource grid 3001 includes Nsize,μgrid1, x common resource blocks starting from the reference point of the resource grid 3001.
An offset 3013 is an offset from the reference point of the resource grid 3001 to a reference point (Nstart, μBWP, i1) of a BandWidth Part (BWP) 3003 having an index of i1.
A common resource block set 3200 is a set of common resource blocks for the subcarrier spacing configuration μ2.
In the common resource block set 3200, a common resource block (block hatched with lines rising diagonally up and to the left in
An offset 3012 is an offset from the reference point of the common resource block set 3200 to a reference point of a resource grid 3002. The offset 3012 is represented by the number of common resource blocks for the subcarrier spacing μ2. The resource grid 3002 includes Nsize,μgrid2, x common resource blocks starting from the reference point of the resource grid 3002.
An offset 3014 is an offset from the reference point of the resource grid 3002 to a reference point (Nstart, μBWP, i2) of a BWP 3004 having an index of i2.
The Resource Block (RB) includes NRBsc consecutive subcarriers. The resource block is a general term for a common resource block, a Physical Resource Block (PRB), and a Virtual Resource Block (VRB). Here, NRBsc is 12.
A resource block unit is a set of resources corresponding to one OFDM symbol in one resource block. That is, one resource block unit includes 12 resource elements corresponding to one OFDM symbol in one resource block.
The common resource blocks for a certain subcarrier spacing configuration μ are assigned indices in ascending order from 0 in the frequency domain in a certain common resource block set (indexing). The common resource block having an index of 0 for a certain subcarrier spacing configuration μ includes (or collides with, matches) the point 3000. An index nμCRB of the common resource block for a certain subcarrier spacing configuration μ satisfies a relationship of nμCRB=ceil(ksc/NRBsc). Here, a subcarrier with ksc=0 is a subcarrier having the same center frequency as the center frequency of a subcarrier corresponding to the point 3000.
Physical resource blocks for a certain subcarrier spacing configuration μ are assigned indices in ascending order from 0 in the frequency domain in a certain BWP. An index nμPRB of the physical resource block for a certain subcarrier spacing configuration μ satisfies a relationship of nμCRB=nμPRB+Nstart, μBWP, i. Here, Nstart, μBWP, i indicates a reference point of the BWP having an index of i.
The BWP is defined as a subset of common resource blocks included in the resource grid. The BWP includes Nsize,μBWP, i common resource blocks starting from the reference point Nstart, μBWP, i of the BWP. The BWP configured for the downlink carrier is also referred to as a downlink BWP. The BWP configured for the uplink component carrier is also referred to as an uplink BWP.
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. The symbol may correspond to an OFDM symbol. The symbol may also correspond to the resource block unit. The symbol may correspond to the resource element.
The fact that a large scale property of a channel over which a symbol on one antenna port is conveyed can be inferred from a channel over which a symbol on another antenna port is conveyed is referred to as the two antenna ports are Quasi Co-Located (QCL). The large scale property may include at least long term performance of a channel. The large scale property may include at least a part or all of delay spread, Doppler spread, Doppler shift, an average gain, an average delay, and a beam parameter (spatial Rx parameters). The fact that the first antenna port and the second antenna port are QCL with respect to a beam parameter may mean that a reception beam assumed by a receiver for the first antenna port and a reception beam assumed by the receiver for the second antenna port are the same. The fact that the first antenna port and the second antenna port are QCL with respect to a beam parameter may mean that a transmission beam assumed by a receiver for the first antenna port and a transmission beam assumed by the receiver for the second antenna port are the same. In a case that the large scale property of a channel over which a symbol on one antenna port is conveyed can be inferred from a channel over which a symbol on another antenna port is conveyed, the terminal apparatus 1 may assume that the two antenna ports are QCL. The fact that two antenna ports are QCL may mean that the two antenna ports are assumed to be QCL.
Carrier aggregation may mean that communication is performed by using multiple serving cells being aggregated. Carrier aggregation may mean that communication is performed by using multiple component carriers being aggregated. Carrier aggregation may mean that communication is performed by using multiple downlink component carriers being aggregated. Carrier aggregation may mean that communication is performed by using multiple uplink component carriers being aggregated.
The radio transmission and/or reception circuitry 30 includes at least a part or all of a radio transmission circuitry 30a and a radio reception circuitry 30b. Here, apparatus configurations of the baseband circuitry included in the radio transmission circuitry 30a and the baseband circuitry included in the radio reception circuitry 30b may be the same or different from each other. Apparatus configurations of the RF circuitry included in the radio transmission circuitry 30a and the RF circuitry included in the radio reception circuitry 30b may be the same or different from each other. Apparatus configurations of the antenna circuitry included in the radio transmission circuitry 30a and the antenna circuitry included in the radio reception circuitry 30b may be the same or different from each other.
For example, the radio transmission circuitry 30a may generate and transmit a baseband signal of the PDSCH. For example, the radio transmission circuitry 30a may generate and transmit a baseband signal of the PDCCH. For example, the radio transmission circuitry 30a may generate and transmit a baseband signal of the PBCH. For example, the radio transmission circuitry 30a may generate and transmit a baseband signal of a synchronization signal. For example, the radio transmission circuitry 30a may generate and transmit a baseband signal of the PDSCH DMRS. For example, the radio transmission circuitry 30a may generate and transmit a baseband signal of the PDCCH DMRS. For example, the radio transmission circuitry 30a may generate and transmit a baseband signal of the CSI-RS. For example, the radio transmission circuitry 30a may generate and transmit a baseband signal of the DL PTRS.
For example, the radio reception circuitry 30b may receive the PRACH. For example, the radio reception circuitry 30b may receive and demodulate the PUCCH. The radio reception circuitry 30b may receive and demodulate the PUSCH. For example, the radio reception circuitry 30b may receive the PUCCH DMRS. For example, the radio reception circuitry 30b may receive the PUSCH DMRS. For example, the radio reception circuitry 30b may receive the UL PTRS. For example, the radio reception circuitry 30b may receive the SRS.
The higher layer processing circuitry 34 outputs downlink data (a transport block) to the radio transmission and/or reception circuitry 30 (or the radio transmission circuitry 30a). The higher layer processing circuitry 34 performs processing operations of a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and an RRC layer.
The medium access control layer processing circuitry 35 included in the higher layer processing circuitry 34 performs processing of the MAC layer.
The radio resource control layer processing circuitry 36 included in the higher layer processing circuitry 34 performs processing of the RRC layer. The radio resource control layer processing circuitry 36 manages various pieces of configuration information/parameters (RRC parameters) of the terminal apparatus 1. The radio resource control layer processing circuitry 36 sets the RRC parameter based on an RRC message received from the terminal apparatus 1.
The radio transmission and/or reception circuitry 30 (or the radio transmission circuitry 30a) performs processing such as modulation and coding. The radio transmission and/or reception circuitry 30 (or the radio transmission circuitry 30a) generates a physical signal through modulation, coding, and baseband signal generation (conversion into the time-continuous signal) on the downlink data, and transmits the physical signal to the terminal apparatus 1. The radio transmission and/or reception circuitry 30 (or the radio transmission circuitry 30a) may map the physical signal to a certain component carrier and transmit the physical signal to the terminal apparatus 1.
The radio transmission and/or reception circuitry 30 (or the radio reception circuitry 30b) performs processing such as demodulation and decoding. The radio transmission and/or reception circuitry 30 (or the radio reception circuitry 30b) separates, demodulates, and decodes the received physical signal, and outputs the decoded information to the higher layer processing circuitry 34. The radio transmission and/or reception circuitry 30 (or the radio reception circuitry 30b) may perform a channel access procedure prior to transmission of the physical signal.
The RF circuitry 32 converts (down converts) a signal received via the antenna circuitry 31 into a baseband signal by means of quadrature demodulation and removes unnecessary frequency components. The RF circuitry 32 outputs a processed analog signal to the baseband circuitry.
The baseband circuitry 33 converts an analog signal input from the RF circuitry 32 into a digital signal. The baseband circuitry 33 removes a portion corresponding to a Cyclic Prefix (CP) from the converted digital signal, performs a Fast Fourier Transform (FFT) on the signal from which the CP has been removed, and extracts a signal in the frequency domain.
The baseband circuitry 33 performs 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 circuitry 33 outputs the converted analog signal to the RF circuitry 32.
The RF circuitry 32 removes an unnecessary frequency component from the analog signal input from the baseband circuitry 33 by using a low-pass filter, up converts the analog signal into a signal having a carrier frequency, and transmits the signal via the antenna circuitry 31. The RF circuitry 32 may have a function of controlling transmission power. The RF circuitry 32 is also referred to as a transmission power control circuitry.
For the terminal apparatus 1, one or multiple serving cells (or component carriers, downlink component carriers, uplink component carriers) may be configured.
Each of the serving cells configured for the terminal apparatus 1 may be one of a Primary cell (PCell), a Primary SCG cell (PSCell), or a Secondary Cell (SCell).
The PCell is a serving cell included in a Master Cell Group (MCG). The PCell is a cell in which an initial connection establishment procedure or a connection re-establishment procedure is performed (has been performed) by the terminal apparatus 1.
The PSCell is a serving cell included in a Secondary Cell Group (SCG). The PSCell is a serving cell in which random access is performed by the terminal apparatus 1 in a Reconfiguration with synchronization.
The SCell may be included in either of the MCG or the SCG.
A serving cell group (cell group) is a term at least including an MCG and an SCG. The serving cell group may include one or multiple serving cells (or component carriers). One or multiple serving cells (or component carriers) included in the serving cell group may be operated by means of carrier aggregation.
One or multiple downlink BWPs may be configured for each of the serving cells (or downlink component carriers). One or multiple uplink BWPs may be configured for each of the serving cells (or uplink component carriers).
Among one or multiple downlink BWPs configured for the serving cell (or the downlink component carrier), one downlink BWP may be configured as an active downlink BWP (or one downlink BWP may be activated). Among one or multiple uplink BWPs configured for the serving cell (or the uplink component carrier), one uplink BWP may be configured as an active uplink BWP (or one uplink BWP may be activated).
The PDSCH, the PDCCH, and the CSI-RS may be received in the active downlink BWP. The terminal apparatus 1 may receive the PDSCH, the PDCCH, and the CSI-RS in the active downlink BWP. The PUCCH and the PUSCH may be transmitted in the active uplink BWP. The terminal apparatus 1 may transmit the PUCCH and the PUSCH in the active uplink BWP. The active downlink BWP and the active uplink BWP are also referred to as an active BWP.
The PDSCH, the PDCCH, and the CSI-RS need not be received in downlink BWPs (inactive downlink BWPs) other than the active downlink BWP. The terminal apparatus 1 need not receive the PDSCH, the PDCCH, and the CSI-RS in the downlink BWP other than the active downlink BWP. The PUCCH and the PUSCH need not be transmitted in uplink BWPs (inactive uplink BWPs) other than the active uplink BWP. The terminal apparatus 1 need not transmit the PUCCH and the PUSCH in an uplink BWP other than the active uplink BWP. The inactive downlink BWP and the inactive uplink BWP are also referred to as an inactive BWP.
Downlink BWP switch is used for deactivating one active downlink BWP and activating any one of the inactive downlink BWPs other than the one active downlink BWP. The downlink BWP switch may be controlled by a BWP field included in downlink control information. The downlink BWP switch may be controlled based on a higher layer parameter.
Uplink BWP switch is used for deactivating one active uplink BWP and activating any one of the inactive uplink BWPs other than the one active uplink BWP. The uplink BWP switch may be controlled by a BWP field included in downlink control information. The uplink BWP switch may be controlled based on a higher layer parameter.
Among one or multiple downlink BWPs configured for the serving cell, two or more downlink BWPs need not be configured for the active downlink BWP. For the serving cell, at certain time, one downlink BWP may be active.
Among one or multiple uplink BWPs configured for the serving cell, two or more uplink BWPs need not be configured for the active uplink BWP. For the serving cell, at certain time, one uplink BWP may be active.
The radio transmission and/or reception circuitry 10 includes at least a part or all of a radio transmission circuitry 10a and a radio reception circuitry 10b. Here, apparatus configurations of the baseband circuitry 13 included in the radio transmission circuitry 10a and the baseband circuitry 13 included in the radio reception circuitry 10b may be the same or different from each other. Apparatus configurations of the RF circuitry 12 included in the radio transmission circuitry 10a and the RF circuitry 12 included in the radio reception circuitry 10b may be the same or different from each other. Apparatus configurations of the antenna circuitry 11 included in the radio transmission circuitry 10a and the antenna circuitry 11 included in the radio reception circuitry 10b may be the same or different from each other.
For example, the radio transmission circuitry 10a may generate and transmit a baseband signal of the PRACH. For example, the radio transmission circuitry 10a may generate and transmit a baseband signal of the PUCCH. The radio transmission circuitry 10a may generate and transmit a baseband signal of the PUSCH. For example, the radio transmission circuitry 10a may generate and transmit a baseband signal of the PUCCH DMRS. For example, the radio transmission circuitry 10a may generate and transmit a baseband signal of the PUSCH DMRS. For example, the radio transmission circuitry 10a may generate and transmit a baseband signal of the UL PTRS. For example, the radio transmission circuitry 10a may generate and transmit a baseband signal of the SRS.
For example, the radio reception circuitry 10b may receive and demodulate the PDSCH. For example, the radio reception circuitry 10b may receive and demodulate the PDCCH. For example, the radio reception circuitry 10b may receive and demodulate the PBCH. For example, the radio reception circuitry 10b may receive the synchronization signal. For example, the radio reception circuitry 10b may receive the PDSCH DMRS. For example, the radio reception circuitry 10b may receive the PDCCH DMRS. For example, the radio reception circuitry 10b may receive the CSI-RS. For example, the radio reception circuitry 10b may receive the DL PTRS.
The higher layer processing circuitry 14 outputs uplink data (a transport block) to the radio transmission and/or reception circuitry 10 (or the radio transmission circuitry 10a). The higher layer processing circuitry 14 performs processing operations of the MAC layer, a packet data convergence protocol layer, a radio link control layer, and the RRC layer.
The medium access control layer processing circuitry 15 included in the higher layer processing circuitry 14 performs processing of the MAC layer.
The radio resource control layer processing circuitry 16 included in the higher layer processing circuitry 14 performs processing of the RRC layer. The radio resource control layer processing circuitry 16 manages various pieces of configuration information/parameters (RRC parameters) of the terminal apparatus 1. The radio resource control layer processing circuitry 16 sets the RRC parameters based on an RRC message received from the base station apparatus 3.
The radio transmission and/or reception circuitry 10 (or the radio transmission circuitry 10a) performs processing such as modulation and coding. The radio transmission and/or reception circuitry 10 (or the radio transmission circuitry 10a) generates a physical signal through modulation, coding, and baseband signal generation (conversion into the time-continuous signal) on the uplink data and transmits the physical signal to the base station apparatus 3. The radio transmission and/or reception circuitry 10 (or the radio transmission circuitry 10a) may map the physical signal to a certain BWP (an active uplink BWP) and transmit the physical signal to the base station apparatus 3.
The radio transmission and/or reception circuitry 10 (or the radio reception circuitry 10b) performs processing such as demodulation and decoding. The radio transmission and/or reception circuitry 10 (or the radio reception circuitry 30b) may receive a physical signal in a certain BWP (active downlink BWP) of a certain serving cell. The radio transmission and/or reception circuitry 10 (or the radio reception circuitry 10b) separates, demodulates, and decodes the received physical signal and outputs the decoded information to the higher layer processing circuitry 14. The radio transmission and/or reception circuitry 10 (radio reception circuitry 10b) may perform the channel access procedure prior to the transmission of the physical signal.
The RF circuitry 12 converts (down converts) a signal received via the antenna circuitry 11 into a baseband signal by means of quadrature demodulation and removes unnecessary frequency components. The RF circuitry 12 outputs a processed analog signal to the baseband circuitry 13.
The baseband circuitry 13 converts the analog signal input from the RF circuitry 12 into a digital signal. The baseband circuitry 13 removes a portion corresponding to a Cyclic Prefix (CP) from the converted digital signal, performs a Fast Fourier Transform (FFT) on the signal from which the CP has been removed, and extracts a signal in the frequency domain.
The baseband circuitry 13 performs Inverse Fast Fourier Transform (IFFT) on the uplink 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 circuitry 13 outputs the converted analog signal to the RF circuitry 12.
The RF circuitry 12 removes unnecessary frequency components from the analog signal input from the baseband circuitry 13 through a low-pass filter, up converts the analog signal into a signal having a carrier frequency, and transmits the signal via the antenna circuitry 11. The RF circuitry 12 may have a function of controlling transmission power. The RF circuitry 12 is also referred to as a transmission power control circuitry.
The physical signal (signal) will be described below.
The physical signal is a general term for a downlink physical channel, a downlink physical signal, an uplink physical channel, and an uplink physical channel. The physical channel is a general term for a downlink physical channel and an uplink physical channel. The physical signal is a general term for a downlink physical signal and an uplink physical signal.
The uplink physical channel may correspond to a set of resource elements for carrying information that is generated in a higher layer. The uplink physical channel may be a physical channel used in the uplink component carrier. The uplink physical channel may be transmitted by the terminal apparatus 1. The uplink physical channel may be received by the base station apparatus 3. In the radio communication system according to an aspect of the present embodiment, at least a part or all of the following uplink physical channels may be used.
The PUCCH may be used to transmit Uplink Control Information (UCI). The PUCCH may be transmitted for conveying (delivering, transmitting) the uplink control information. The uplink control information may be mapped to the PUCCH. The terminal apparatus 1 may transmit the PUCCH to which the uplink control information is mapped. The base station apparatus 3 may receive the PUCCH to which the uplink control information is mapped.
The uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) includes at least a part or all of Channel State Information (CSI), a Scheduling Request (SR), and Hybrid Automatic Repeat request ACKnowledgement (HARQ-ACK) information.
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.
The HARQ-ACK information may include at least a HARQ-ACK corresponding to a Transport block (or TB, Medium Access Control Protocol Data Unit (MAC PDU), Downlink-Shared Channel (DL-SCH), Uplink-Shared Channel (UL-SCH), Physical Downlink Shared Channel (PDSCH), Physical Uplink Shared CHannel (PUSCH)). The HARQ-ACK may indicate an acknowledgement (ACK) or a negative-acknowledgement (NACK) corresponding to the transport block. The ACK may indicate that decoding of the transport block has been decoded successfully. The NACK may indicate that decoding of the transport block has not been decoded successfully. The HARQ-ACK information may include a HARQ-ACK codebook including one or multiple HARQ-ACK bits.
The fact that the HARQ-ACK information and the transport block correspond to each other may mean that the HARQ-ACK information and the PDSCH used for conveying the transport block correspond to each other.
The HARQ-ACK may indicate an ACK or a NACK corresponding to one Code Block Group (CBG) included in the transport block.
The scheduling request may be at least used for requesting a resource of the PUSCH (or the UL-SCH) for new transmission. The scheduling request bit may be used for indicating either of a positive SR or a negative SR. The scheduling request bit indicating the positive SR is also referred to as “the positive SR being transmitted”. The positive SR may indicate that a resource of the PUSCH (or the UL-SCH) for new transmission is requested by the terminal apparatus 1. The positive SR may indicate that a scheduling request is triggered by a higher layer. The positive SR may be transmitted in a case that the higher layer indicates transmission of the scheduling request. The scheduling request bit indicating the negative SR is also referred to as “the negative SR being transmitted”. The negative SR may indicate that a resource of the PUSCH (or the UL-SCH) for new transmission is not requested by the terminal apparatus 1. The negative SR may indicate that the scheduling request is not triggered by the higher layer. The negative SR may be transmitted in a case that transmission of a scheduling request is not indicated by the higher layer.
Channel state information may include at least a part or all of a Channel Quality Indicator (CQI), a Precoder Matrix Indicator (PMI), and a Rank Indicator (RI). The CQI is an indicator related to quality (for example, propagation strength) of a channel or quality of a physical channel, and the PMI is an indicator related to a precoder. The RI is an indicator related to a transmission rank (or the number of transmission layers).
The channel state information may be given based at least on reception of a physical signal (for example, a CSI-RS) at least used for channel measurement. The channel state information may be selected by the terminal apparatus 1 based at least on reception of the physical signal at least used for channel measurement. Channel measurement may include interference measurement.
The PUCCH may correspond to a PUCCH format. The PUCCH may be a set of resource elements used for conveying the PUCCH format. The PUCCH may include the PUCCH format.
The PUSCH may be used for transmitting a transport block and/or uplink control information. The PUSCH may be used for transmitting the transport block and/or the uplink control information corresponding to the UL-SCH. The PUSCH may be used for conveying the transport block and/or the uplink control information. The PUSCH may be used for conveying the transport block and/or the uplink control information corresponding to the UL-SCH. The transport block may be mapped to the PUSCH. The transport block corresponding to the UL-SCH may be mapped to the PUSCH. The uplink control information may be mapped to the PUSCH. The terminal apparatus 1 may transmit the PUSCH to which the transport block and/or the uplink control information is mapped. The base station apparatus 3 may receive the PUSCH to which the transport block and/or the uplink control information is mapped.
The PRACH may be used for transmitting a random access preamble. The PRACH may be used for conveying a random access preamble. A PRACH sequence xu, v(n) is defined by xu, v(n)=xu(mod(n+Cv, LRA)). xu may be a Zadoff Chu (ZC) sequence. xu is defined by xu=exp(−jπui(i+1)/LRA). j is an imaginary unit. π is ratio of the circumference of a circle to its diameter. Cv corresponds to a cyclic shift of the PRACH sequence. LRA corresponds to the length of the PRACH sequence. LRA is 839, or 139. i is an integer in the range from 0 to LRA−1. u is a sequence index for the PRACH sequence. The terminal apparatus 1 may transmit the PRACH. The base station apparatus 3 may receive the PRACH.
For a certain PRACH occasion, 64 random access preambles are defined. Each of the random access preambles is identified (determined, given) based at least on the cyclic shift C v of the PRACH sequence and the sequence index u for the PRACH sequence. Each of the 64 identified random access preambles may be assigned an index.
The uplink physical signal may correspond to a set of resource elements. The uplink physical signal need not carry information generated in a higher layer. The uplink physical signal may be a physical signal used in the uplink component carrier. The terminal apparatus 1 may transmit the uplink physical signal. The base station apparatus 3 may receive the uplink physical signal. In the radio communication system according to an aspect of the present embodiment, at least a part or all of the following uplink physical signals may be used.
The UL DMRS is a general term for a DMRS for the PUSCH and a DMRS for the PUCCH.
A set of antenna ports of the DMRS for the PUSCH (DMRS related to the PUSCH, DMRS included in the PUSCH, DMRS corresponding to the PUSCH) may be given based on a set of antenna ports for the PUSCH. In other words, the set of antenna ports of the DMRS for the PUSCH may be the same as a set of antenna ports of the PUSCH.
Transmission of the PUSCH and transmission of the DMRS for the PUSCH may be indicated (or may be scheduled) by one DCI format. The PUSCH and the DMRS for the PUSCH may be collectively referred to as a PUSCH. Transmission of the PUSCH may mean transmission of the PUSCH and the DMRS for the PUSCH.
The PUSCH may be inferred from the DMRS for the PUSCH. In other words, a channel (propagation path) of the PUSCH may be inferred from the DMRS for the PUSCH.
A set of antenna ports of the DMRS for the PUCCH (DMRS related to the PUCCH, DMRS included in the PUCCH, DMRS corresponding to the PUCCH) may be the same as a set of antenna ports of the PUCCH.
Transmission of the PUCCH and transmission of the DMRS for the PUCCH may be indicated (or may be triggered) by one DCI format. Resource element mapping of the PUCCH and/or resource element mapping of the DMRS for the PUCCH may be given by one PUCCH format. The PUCCH and the DMRS for the PUCCH may be collectively referred to as a PUCCH. Transmission of the PUCCH may mean transmission of the PUCCH and the DMRS for the PUCCH.
The PUCCH may be inferred from the DMRS for the PUCCH. In other words, a channel of the PUCCH may be inferred from the DMRS for the PUCCH.
The downlink physical channel may correspond to a set of resource elements for carrying information generated in a higher layer. The downlink physical channel may be a physical channel used in a downlink component carrier. The base station apparatus 3 may transmit the downlink physical channel. The terminal apparatus 1 may receive the downlink physical channel. In the radio communication system according to an aspect of the present embodiment, at least a part or all of the following downlink physical channels may be used.
The PBCH may be used for transmitting a Master Information Block (MIB) and/or physical layer control information. The PBCH may be transmitted for conveying (delivering, transmitting) the MIB and/or the physical layer control information. The BCH may be mapped to the PBCH. The terminal apparatus 1 may receive the PBCH to which the MIB and/or the physical layer control information is mapped. The base station apparatus 3 may transmit the PBCH to which the MIB and/or the physical layer control information is mapped. The physical layer control information is also referred to as a PBCH payload, or a PBCH payload related to timing. The MIB may include one or multiple higher layer parameters.
The physical layer control information includes 8 bits. The physical layer control information may include at least a part 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
The radio frame bit is used for indicating a radio frame in which the PBCH is transmitted (radio frame including a slot in which the PBCH is transmitted). The radio frame bit includes 4 bits. The radio frame bit may include 4 bits out of a 10-bit radio frame indicator. For example, the radio frame indicator may be at least used for identifying radio frames from index 0 to index 1023.
The half radio frame bit is used for indicating, out of the radio frame in which the PBCH is transmitted, which of the first five subframes or the last five subframes is used for transmission of the PBCH. Here, the half radio frame may include five subframes. The half radio frame may include the first five subframes out of the 10 subframes included in the radio frame. The half radio frame may include the last five subframes out of the 10 subframes included in the radio frame.
The SS/PBCH block index bit is used for indicating an SS/PBCH block index. The SS/PBCH block index bit includes 3 bits. The SS/PBCH block index bit may include 3 bits out of a 6-bit SS/PBCH block index indicator. The SS/PBCH block index indicator may be at least used for identifying SS/PBCH blocks from index 0 to index 63.
The subcarrier offset bit is used for indicating a subcarrier offset. The subcarrier offset may be used for indicating a difference between the first subcarrier to which the PBCH is mapped and the first subcarrier to which the control resource set having an index of 0 is mapped.
The PDCCH may be used for transmitting Downlink Control Information (DCI). The PDCCH may be transmitted for conveying (delivering, transmitting) the downlink control information. The downlink control information may be mapped to the PDCCH. The terminal apparatus 1 may receive the PDCCH to which the downlink control information is mapped. The base station apparatus 3 may transmit the PDCCH to which the downlink control information is mapped.
The downlink control information may correspond to a DCI format. The downlink control information may be included in the DCI format. The downlink control information may be mapped to each field of the DCI format.
A DCI format 0_0, a DCI format 0_1, a DCI format 1_0, and a DCI format 1_1 are DCI formats including a set of fields different from each other. An uplink DCI format is a general term for the DCI format 0_0 and the DCI format 0_1. A downlink DCI format is a general term for the DCI format 1_0 and the DCI format 1_1.
The DCI format 0_0 is at least used for scheduling the PUSCH of a certain cell (or mapped to a certain cell). The DCI format 0_0 includes at least a part or all of fields listed from 1A to 1E.
1A) Identifier field for DCI formats
1B) Frequency domain resource assignmentfield
1C) Time domain resource assignment field
1D) Frequency hopping flag field
1E) Modulation and Coding Scheme (MCS) field
The identifier field for DCI formats may indicate whether the DCI format including the identifier field for DCI formats is an uplink DCI format or a downlink DCI format. The identifier field for DCI formats included in the DCI format 0_0 may indicate 0 (or may indicate that the DCI format 0_0 is an uplink DCI format).
The frequency domain resource assignment field included in the DCI format 0_0 may be at least used for indicating assignment of frequency resources for the PUSCH.
The time domain resource assignment field included in the DCI format 0_0 may be at least used for indicating assignment of time resources for the PUSCH.
The frequency hopping flag field may be at least used for indicating whether frequency hopping is applied to the PUSCH.
The MCS field included in the DCI format 0_0 may be at least used for indicating a part or all of a modulation scheme for the PUSCH and/or a target coding rate. The target coding rate may be a target coding rate for the transport block of the PUSCH. The Transport Block Size (TBS) of the PUSCH may be given based at least on a part or all of the target coding rate and the modulation scheme for the PUSCH.
The DCI format 0_0 need not include a field used for a CSI request. In other words, CSI need not be requested by using the DCI format 0_0.
The DCI format 0_0 need not include a carrier indicator field. In other words, the uplink component carrier to which the PUSCH scheduled by a DCI format 0_0 is mapped may be the same as the uplink component carrier to which the PDCCH including the DCI format 0_0 is mapped.
The DCI format 0_0 need not include the BWP field. In other words, the uplink BWP to which the PUSCH scheduled by a DCI format 0_0 is mapped may be the same as the uplink BWP to which the PDCCH including the DCI format 0_0 is mapped.
The DCI format 0_1 is at least used for scheduling of the PUSCH of a certain cell (mapped to a certain cell). The DCI format 0_1 includes at least a part or all of fields listed from 2A to 2H.
2A) Identifier field for DCI formats
2B) Frequency domain resource assignment field
2C) Uplink time domain resource assignment field
2D) Frequency hopping flag field
2E) MCS field
2F) CSI request field
2G) BWP field
2H) Carrier indicator field
The identifier field for DCI formats included in the DCI format 0_1 may indicate 0 (or may indicate that the DCI format 0_1 is an uplink DCI format).
The frequency domain resource assignment field included in the DCI format 0_1 may be at least used for indicating assignment of frequency resources for the PUSCH.
The time domain resource assignment field included in the DCI format 0_1 may be at least used for indicating assignment of time resources for the PUSCH.
The MCS field included in the DCI format 0_1 may be at least used for indicating a part or all of a modulation scheme for the PUSCH and/or a target coding rate.
In a case that the BWP field is included in the DCI format 0_1, the BWP field may be used for indicating an uplink BWP to which the PUSCH is mapped. In a case that the BWP field is not included in the DCI format 0_1, the uplink BWP to which the PUSCH is mapped may be the same as the uplink BWP to which the PDCCH including the DCI format 0_1 used for scheduling of the PUSCH is mapped. In a case that the number of uplink BWPs configured for the terminal apparatus 1 in a certain uplink component carrier is two or more, the number of bits of the BWP field included in the DCI format 0_1 used for scheduling of the PUSCH mapped to the certain uplink component carrier may be 1 bit or more. In a case that the number of uplink BWPs configured for the terminal apparatus 1 in a certain uplink component carrier is one, the number of bits of the BWP field included in the DCI format 0_1 used for scheduling of the PUSCH mapped to the certain uplink component carrier may be 0 bits (or the BWP field need not be included in the DCI format 0_1 used for scheduling of the PUSCH mapped to the certain uplink component carrier).
The CSI request field is at least used for indicating the report of the CSI.
In a case that the carrier indicator field is included in the DCI format 0_1, the carrier indicator field may be used for indicating the uplink component carrier to which the PUSCH is mapped. In a case that the carrier indicator field is not included in the DCI format 0_1, the uplink component carrier to which the PUSCH is mapped may be the same as the uplink component carrier to which the PDCCH including the DCI format 0_1 used for scheduling of the PUSCH is mapped. In a case that the number of uplink component carriers configured for the terminal apparatus 1 in a certain serving cell group is two or more (case that uplink carrier aggregation is operated in a certain serving cell group), the number of bits of the carrier indicator field included in the DCI format 0_1 used for scheduling of the PUSCH mapped to the certain serving cell group may be 1 bit or more (for example, 3 bits). In a case that the number of uplink component carriers configured for the terminal apparatus 1 in a certain serving cell group is one (case that uplink carrier aggregation is not operated in a certain serving cell group), the number of bits of the carrier indicator field included in the DCI format 0_1 used for scheduling of the PUSCH mapped to the certain serving cell group may be 0 bits (or the carrier indicator field need not be included in the DCI format 0_1 used for scheduling of the PUSCH mapped to the certain serving cell group).
The DCI format 1_0 is at least used for scheduling of the PDSCH of a certain cell (mapped to a certain cell). The DCI format 1_0 includes at least a part or all of 3A to 3F.
3A) Identifier field for DCI formats
3B) Frequency domain resource assignment field
3C) Time domain resource assignment field
3D) MCS field
3E) PDSCH to HARQ feedback timing indicator field
3F) PUCCH resource indicator field
The identifier field for DCI formats included in the DCI format 1_0 may indicate 1 (or may indicate that the DCI format 1_0 is a downlink DCI format).
The frequency domain resource assignment field included in the DCI format 1_0 may be at least used for indicating assignment of frequency resources for the PDSCH.
The time domain resource assignment field included in the DCI format 1_0 may be at least used for indicating assignment of time resources for the PDSCH.
The MCS field included in the DCI format 1_0 may be at least used for indicating a part or all of a modulation scheme for the PDSCH and/or a target coding rate. The target coding rate may be a target coding rate for the transport block of the PDSCH. The Transport Block Size (TBS) of the PDSCH may be given based at least on a part or all of the target coding rate and the modulation scheme for the PDSCH.
The PDSCH to HARQ feedback timing indicator field may be at least used for indicating an offset from the slot including the last OFDM symbol of the PDSCH to the slot including the first OFDM symbol of the PUCCH.
The PUCCH resource indicator field may be a field indicating an index of one of one or multiple PUCCH resources included in a PUCCH resource set. The PUCCH resource set may include one or multiple PUCCH resources.
The DCI format 1_0 need not include the carrier indicator field. In other words, the downlink component carrier to which the PDSCH scheduled by using a DCI format 1_0 is mapped may be the same as the downlink component carrier to which the PDCCH including the DCI format 1_0 is mapped.
The DCI format 1_0 need not include the BWP field. In other words, the downlink BWP to which the PDSCH scheduled by using a DCI format 1_0 is mapped may be the same as the downlink BWP to which the PDCCH including the DCI format 1_0 is mapped.
The DCI format 1_1 is at least used for scheduling the PDSCH of a certain cell (or mapped to a certain cell). The DCI format 1_1 includes at least a part or all of 4A to 4I.
4A) Identifier field for DCI formats
4B) Frequency domain resource assignment field
4C) Time domain resource assignment field
4E) MCS field
4F) PDSCH to HARQ feedback timing indicator field
4G) PUCCH resource indicator field
4H) BWP field
4I) Carrier indicator field
The identifier field for DCI formats included in the DCI format 1_1 may indicate 1 (or may indicate that the DCI format 1_1 is a downlink DCI format).
The frequency domain resource assignment field included in the DCI format 1_1 may be at least used for indicating assignment of frequency resources for the PDSCH.
The time domain resource assignment field included in the DCI format 1_1 may be at least used for indicating assignment of time resources for the PDSCH.
The MCS field included in the DCI format 1_1 may be at least used for indicating a part or all of the modulation scheme for the PDSCH and/or the target coding rate.
In a case that the PDSCH to HARQ feedback timing indicator field is included in the DCI format 1_1, the PDSCH to HARQ feedback timing indicator field may be at least used for indicating an offset from the slot including the last OFDM symbol of the PDSCH to the slot including the first OFDM symbol of the PUCCH. In a case that the PDSCH to HARQ feedback timing indicator field is not included in the DCI format 1_1, an offset from the slot including the last OFDM symbol of the PDSCH to the slot including the first OFDM symbol of the PUCCH may be identified by a higher layer parameter.
The PUCCH resource indicator field may be a field indicating an index of one of one or multiple PUCCH resources included in a PUCCH resource set.
In a case that the BWP field is included in the DCI format 1_1, the BWP field may be used for indicating the downlink BWP to which the PDSCH is mapped. In a case that the BWP field is not included in the DCI format 1_1, the downlink BWP to which the PDSCH is mapped may be the same as the downlink BWP to which the PDCCH including the DCI format 1_1 used for scheduling of the PDSCH is mapped. In a case that the number of downlink BWPs configured for the terminal apparatus 1 in a certain downlink component carrier is two or more, the number of bits of the BWP field included in the DCI format 1_1 used for scheduling of the PDSCH mapped to the certain downlink component carrier may be 1 bit or more. In a case that the number of downlink BWPs configured for the terminal apparatus 1 in a certain downlink component carrier is one, the number of bits of the BWP field included in the DCI format 1_1 used for scheduling of the PDSCH mapped to the certain downlink component carrier may be 0 bits (or the BWP field need not be included in the DCI format 1_1 used for scheduling of the PDSCH mapped to the certain downlink component carrier).
In a case that the carrier indicator field is included in the DCI format 1_1, the carrier indicator field may be used for indicating the downlink component carrier to which the PDSCH is mapped. In a case that the carrier indicator field is not included in the DCI format 1_1, the downlink component carrier to which the PDSCH is mapped may be the same as the downlink component carrier to which the PDCCH including the DCI format 1_1 used for scheduling of the PDSCH is mapped. In a case that the number of downlink component carriers configured for the terminal apparatus 1 in a certain serving cell group is two or more (case that downlink carrier aggregation is operated in a certain serving cell group), the number of bits of the carrier indicator field included in the DCI format 1_1 used for scheduling of the PDSCH mapped to the certain serving cell group may be 1 bit or more (for example, 3 bits). In a case that the number of downlink component carriers configured for the terminal apparatus 1 in a certain serving cell group is one (case that downlink carrier aggregation is not operated in a certain serving cell group), the number of bits of the carrier indicator field included in the DCI format 1_1 used for scheduling of the PDSCH mapped to the certain serving cell group may be 0 bits (or the carrier indicator field need not be included in the DCI format 1_1 used for scheduling of the PDSCH mapped to the certain serving cell group).
The PDSCH may be used for transmitting the transport block. The PDSCH may be used for transmitting the transport block corresponding to the DL-SCH. The PDSCH may be used for conveying the transport block. The PDSCH may be used for conveying the transport block corresponding to the DL-SCH. The transport block may be mapped to the PDSCH. The transport block corresponding to the DL-SCH may be mapped to the PDSCH. The base station apparatus 3 may transmit the PDSCH. The terminal apparatus 1 may receive the PDSCH.
The downlink physical signal may correspond to a set of resource elements. The downlink physical signal need not carry information generated in a higher layer. The downlink physical signal may be a physical signal used in the downlink component carrier. The downlink physical signal may be transmitted by the base station apparatus 3. The downlink physical signal may be transmitted by the terminal apparatus 1. In the radio communication system according to an aspect of the present embodiment, at least a part or all of the following downlink physical signals may be used.
The synchronization signal may be at least used for the terminal apparatus 1 to establish synchronization of the frequency domain and/or the time domain in the downlink. The synchronization signal is a general term for the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS).
As illustrated in
The PSS, the SSS, the PBCH, and the antenna port of the DMRS for the PBCH may be the same.
The PBCH over which the symbol of the PBCH on a certain antenna port is conveyed may be inferred from the DMRS for the PBCH mapped to the slot to which the PBCH is mapped and for the PBCH included in the SS/PBCH block including the PBCH.
The DL DMRS is a general term for a DMRS for the PBCH, a DMRS for the PDSCH, and a DMRS for the PDCCH.
A set of antenna ports of the DMRS for the PDSCH (DMRS related to the PDSCH, DMRS included in the PDSCH, DMRS corresponding to the PDSCH) may be given based on a set of antenna ports for the PDSCH. In other words, the set of antenna ports of the DMRS for the PDSCH may be the same as the set of antenna ports for the PDSCH.
Transmission of the PDSCH and transmission of the DMRS for the PDSCH may be indicated (or may be scheduled) by one DCI format. The PDSCH and the DMRS for the PDSCH may be collectively referred to as a PDSCH. Transmission of the PDSCH may be transmission of the PDSCH and the DMRS for the PDSCH.
The PDSCH may be inferred from the DMRS for the PDSCH. In other words, a channel of the PDSCH may be inferred from the DMRS for the PDSCH. In a case that a set of resource elements in which the symbol of a certain PDSCH is conveyed and a set of resource elements in which the symbol of the DMRS for the certain PDSCH is conveyed are included in the same Precoding Resource Group (PRG), the PDSCH over which the symbol of the PDSCH on a certain antenna port is conveyed may be inferred from the DMRS for the PDSCH.
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.
The PDCCH may be inferred from the DMRS for the PDCCH. In other words, a channel of the PDCCH may be inferred from the DMRS for the PDCCH. In a case that the same precoder is (assumed to be) applied to a set of resource elements in which the symbol of a certain PDCCH is conveyed and a set of resource elements in which the symbol of the DMRS for the certain PDCCH is conveyed, the PDCCH over which the symbol of the PDCCH on a certain antenna port is conveyed may be inferred from the DMRS for the PDCCH.
A Broadcast CHannel (BCH), an Uplink-Shared CHannel (UL-SCH), and a Downlink-Shared CHannel (DL-SCH) are transport channels. A channel used in the MAC layer is referred to as a transport channel. A unit of the transport channel used in the MAC layer is also referred to as a transport block (TB) or a MAC Protocol Data Unit (PDU). Control of the Hybrid Automatic Repeat reQuest (HARD) is performed for each transport block in the MAC layer. The transport block is a unit of data that the MAC layer delivers to the physical layer. In the physical layer, the transport block is mapped to a codeword, and modulation processing is performed for each codeword.
For each serving cell, one UL-SCH and one DL-SCH may be given. The BCH may be given to the PCell. The BCH need not be given to the PSCell and the SCell.
A Broadcast Control CHannel (BCCH), a Common Control CHannel (CCCH), and a Dedicated Control CHannel (DCCH) are logical channels. For example, the BCCH is a channel of the RRC layer used for transmitting the MIB or system information. The Common Control CHannel (CCCH) may be used for transmitting a common RRC message in multiple terminal apparatuses 1. Here, the CCCH may be, for example, used for the terminal apparatus 1 that is not in a state of RRC connection. The Dedicated Control CHannel (DCCH) may be at least used for transmitting an RRC message dedicated to the terminal apparatus 1. Here, the DCCH may be, for example, used for the terminal apparatus 1 that is in a state of RRC connection.
The RRC message includes one or multiple RRC parameters (information elements). For example, the RRC message may include the MIB. The RRC message may include the system information. The RRC message may include a message corresponding to the CCCH. The RRC message may include a message corresponding to the DCCH. The RRC message including a message corresponding to the DCCH is also referred to as a dedicated RRC message.
The BCCH in the logical channel may be mapped to the BCH or the DL-SCH in the transport channel. The CCCH in the logical channel may be mapped to the DL-SCH or the UL-SCH in the transport channel. The DCCH in the logical channel may be mapped to the DL-SCH or the UL-SCH in the transport channel.
The UL-SCH in the transport channel may be mapped to the PUSCH in the physical channel. The DL-SCH in the transport channel may be mapped to the PDSCH in the physical channel. The BCH in the transport channel may be mapped to the PBCH in the physical channel.
The higher layer parameter is a parameter included in the RRC message or a Medium Access Control Control Element (MAC CE). In other words, the higher layer parameter is a general term for the MIB, the system information, a message corresponding to the CCCH, a message corresponding to the DCCH, and parameters included in the MAC CE. The parameters included in the MAC CE are transmitted by a MAC Control Element (CE) command.
Procedures performed by the terminal apparatus 1 include at least a part or all of the following 5A to 5C.
5A) Cell search
5B) Random access
5C) Data communication
The cell search is a procedure used for the terminal apparatus 1 synchronizing with a certain cell related to the time domain and the frequency domain and detecting a physical cell identity (physical cell ID). In other words, by means of the cell search, the terminal apparatus 1 may perform synchronization with a certain cell in the time domain and the frequency domain and detect a physical cell ID.
A sequence of the PSS is given based at least on the physical cell ID. A sequence of the SSS is given based at least on the physical cell ID.
An SS/PBCH block candidate indicates a resource allowed to (possible to, scheduled to, configured to, defined to, having a possibility to) transmit the SS/PBCH block.
A set of SS/PBCH block candidates in a certain half radio frame is also referred to as an SS burst set. The SS burst set is also referred to as a transmission window, an SS transmission window, or a Discovery Reference Signal transmission window (DRS transmission window). The SS burst set is a general term including at least a first SS burst set and a second SS burst set.
The base station apparatus 3 transmits SS/PBCH blocks with one or multiple indices in a prescribed periodicity. The terminal apparatus 1 may detect at least one SS/PBCH block out of the SS/PBCH blocks with one or multiple indices and attempt decoding of the PBCH included in the at least one SS/PBCH block.
The random access is a procedure including at least a part or all of a message 1, a message 2, a message 3, and a message 4.
The message 1 is a procedure in which the PRACH is transmitted by the terminal apparatus 1. The terminal apparatus 1 transmits the PRACH in one PRACH occasion selected out of one or multiple PRACH occasions based at least on the index of the SS/PBCH block candidate detected based on the cell search. Each of the PRACH occasions is defined based at least on resources in the time domain and the frequency domain.
The terminal apparatus 1 transmits one random access preamble selected out of the PRACH occasions corresponding to the indices of the SS/PBCH block candidates in which the SS/PBCH block is detected.
The message 2 is a procedure for attempting to detect a DCI format 1_0 with a Cyclic Redundancy Check (CRC) scrambled with a Random Access—Radio Network Temporary Identifier (RA-RNTI) by the terminal apparatus 1. The terminal apparatus 1 attempts detection of the PDCCH including the DCI format in a control resource set given based on the MIB, which is included in the PBCH included in the SS/PBCH block detected based on cell search, and in resources indicated based on a configuration of a search space set. The message 2 is also referred to as a random access response.
The message 3 is a procedure for transmitting the PUSCH scheduled by using a random access response grant included in a DCI format 1_0 detected through the procedure of the message 2. Here, the random access response grant is indicated by the MAC CE included in the PDSCH scheduled by using the DCI format 1_0.
The PUSCH scheduled based on the random access response grant is either a message 3 PUSCH or a PUSCH. The message 3 PUSCH includes a contention resolution identifier (contention resolution ID) MAC CE. The contention resolution ID MAC CE includes a contention resolution ID.
Retransmission of the message 3 PUSCH is scheduled by using a DCI format 0_0 with a CRC scrambled based on a Temporary Cell—Radio Network Temporary Identifier (TC-RNTI).
The message 4 is a procedure for attempting to detect a DCI format 1_0 with a CRC scrambled based on either of a Cell—Radio Network Temporary Identifier (C-RNTI) or a TC-RNTI. The terminal apparatus 1 receives a PDSCH scheduled based on the DCI format 1_0. The PDSCH may include a contention resolution ID.
Data communication is a general term for downlink communication and uplink communication.
In the data communication, the terminal apparatus 1 attempts detection of the PDCCH (monitors the PDCCH, supervises the PDCCH) in a control resource set and resources identified based on a search space set.
The control resource set is a set of resources including a certain number of resource blocks and a certain number of OFDM symbols. In the frequency domain, the control resource set may include continuous resources (non-interleaved mapping) or may include distributed resources (interleaver mapping).
A set of resource blocks constituting the control resource set may be indicated by the higher layer parameter. The number of OFDM symbols constituting the control resource set may be indicated by the higher layer parameter.
The terminal apparatus 1 attempts detection of the PDCCH in a search space set. Here, an attempt to detect the PDCCH in the search space set may be an attempt to detect a candidate of the PDCCH in the search space set, may be an attempt to detect a DCI format in the search space set, may be an attempt to detect the PDCCH in the control resource set, may be an attempt to detect a candidate of the PDCCH in the control resource set, or may be an attempt to detect a DCI format in the control resource set.
The search space set is defined as a set of candidates of the PDCCH. The search space set may be a Common Search Space (CSS) set or may be a UE-specific Search Space (USS) set. The terminal apparatus 1 attempts detection of candidates of the PDCCH 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 PDCCH search space set (UE-specific search space set).
The Type 0 PDCCH common search space set may be used as a common search space set having an index of 0. The Type 0 PDCCH common search space set may be a common search space set having an index of 0.
The CSS set is a general term for the Type 0 PDCCH common search space set, the Type 0a PDCCH common search space set, the Type 1 PDCCH common search space set, the Type 2 PDCCH common search space set, and the Type 3 PDCCH common search space set. The USS set is also referred to as a UE-specific PDCCH search space set.
A certain search space set is related to (included in, corresponds to) a certain control resource set. The index of the control resource set related to the search space set may be indicated by the higher layer parameter.
For a certain search space set, a part or all of 6A to 6C may be indicated by at least the higher layer parameter.
6A) PDCCH monitoring periodicity
6B) PDCCH monitoring pattern within a slot
6C) PDCCH monitoring offset
The monitoring occasion of a certain search space set may correspond to the OFDM symbol to which the first OFDM symbol of a control resource set related to the certain search space set is mapped. The monitoring occasion of a certain search space set may correspond to a resource of a control resource set starting from the first OFDM symbol of the control resource set related to the certain search space set. The monitoring occasion of the search space set is given based at least on a part or all of the monitoring periodicity of the PDCCH, the monitoring pattern of the PDCCH in a slot, and the monitoring offset of the PDCCH.
In
The monitoring periodicity of the search space set 91 is set to one slot, the monitoring offset of the search space set 91 is set to zero slots, and the monitoring pattern of the search space set 91 is set to [1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0]. In other words, the monitoring occasions for the search space set 91 corresponds to the first OFDM symbol (OFDM symbol #0) and the eighth OFDM symbol (OFDM symbol #7) in each of the slots.
The monitoring periodicity of the search space set 92 is set to two slots, the monitoring offset of the search space set 92 is set to zero slots, and the monitoring pattern of the search space set 92 is set to [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]. In other words, the monitoring occasion for the search space set 92 corresponds to the first OFDM symbol (OFDM symbol #0) in each of the even-numbered slots.
The monitoring periodicity of the search space set 93 is set to two slots, the monitoring offset of the search space set 93 is set to zero slots, and the monitoring pattern of the search space set 93 is set to [0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0]. In other words, the monitoring occasion for the search space set 93 corresponds to the eighth OFDM symbol (OFDM symbol #7) in each of the even-numbered slots.
The monitoring periodicity of the search space set 94 is set to two slots, the monitoring offset of the search space set 94 is set to one slot, and the monitoring pattern of the search space set 94 is set to [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]. In other words, the monitoring occasion for the search space set 94 corresponds to the first OFDM symbol (OFDM symbol #0) in each of the odd-numbered slots.
The Type 0 PDCCH common search space set may be at least used for the DCI format with a Cyclic Redundancy Check (CRC) sequence scrambled with a System Information-Radio Network Temporary Identifier (SI-RNTI).
The Type 0a PDCCH common search space set may be at least used for the DCI format with a Cyclic Redundancy Check (CRC) sequence scrambled with a System Information-Radio Network Temporary Identifier (SI-RNTI).
The Type 1 PDCCH common search space set may be at least used for the DCI format with a CRC sequence scrambled with a Random Access-Radio Network Temporary Identifier (RA-RNTI) and/or a CRC sequence scrambled with a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI).
The Type 2 PDCCH common search space set may be used for the DCI format with a CRC sequence scrambled with a Paging—Radio Network Temporary Identifier (P-RNTI).
The Type 3 PDCCH common search space set may be used for the DCI format with a CRC sequence scrambled with a Cell-Radio Network Temporary Identifier (C-RNTI).
The UE-specific PDCCH search space set may be at least used for the DCI format with a CRC sequence scrambled with a C-RNTI.
In the downlink communication, the terminal apparatus 1 detects a downlink DCI format. The detected downlink DCI format is at least used for resource assignment of the PDSCH. The detected downlink DCI format is also referred to as a downlink assignment. The terminal apparatus 1 attempts reception of the PDSCH. Based on the PUCCH resource indicated based on the detected downlink DCI format, the HARQ-ACK corresponding to the PDSCH (HARQ-ACK corresponding to the transport block included in the PDSCH) is reported to the base station apparatus 3.
In the uplink communication, the terminal apparatus 1 detects an uplink DCI format. The detected DCI format is at least used for resource assignment of the PUSCH. The detected uplink DCI format is also referred to as an uplink grant. The terminal apparatus 1 performs transmission of the PUSCH.
In configured grant, the uplink grant for scheduling the PUSCH is configured for each transmission periodicity of the PUSCH. A part or all of pieces of information indicated by an uplink DCI format in a case that the PUSCH is scheduled by the uplink DCI format may be indicated by the uplink grant configured in a case of the configured grant.
The terminal apparatus 1 may be given one or multiple PUCCH resources by the higher layer. In the terminal apparatus 1, one or multiple PUCCH resources may be assigned to one PUCCH transmission. The PUCCH resource may be determined based at least on a part or all of elements P1 to P5. That is, a part or all of the elements P1 to P5 may be configured for the PUCCH resource. In addition, a part or all of the elements P1 to P5 may be configured for each PUCCH resource. For example, an n-th set may be configured for an n-th PUCCH resource. The n-th set may be a part or all of the elements P1 to P5. The n may be an integer of 1 or more. The fact that a certain higher layer parameter is configured for the PUCCH resource may be that the PUCCH resource includes the certain higher layer parameter or that the certain higher layer parameter characterizes the PUCCH resource.
P1) Index of PUCCH format
P2) Index of first OFDM symbol of PUCCH
P3) Number of OFDM symbols of PUCCH
P4) Index of first resource block of PUCCH
P5) Number of resource blocks MPUCCHRB of PUCCH
The PUCCH resource may be indicated based at least on the PUCCH resource indicator field in the DCI format indicating a certain PUCCH transmission. The certain PUCCH transmission may correspond to the PUCCH resource. Furthermore, the fact that the PUCCH resource is indicated by the PUCCH resource indicator field in the DCI format may be that the PUCCH transmission corresponding to the PUCCH resource is indicated by the DCI format. The fact that a certain PUCCH transmission corresponds to the PUCCH resource may be that at least a resource used for the certain PUCCH transmission is given. For example, the resource may be time. The resource may be a frequency or a frequency band.
In the terminal apparatus 1, one PUCCH resource set may be configured by a higher layer parameter pucch-ResourceCommon. The one PUCCH resource set may include 16 PUCCH resources.
In the terminal apparatus 1, a maximum of four PUCCH resource sets may be configured by a higher layer parameter pucch-ResourceSet. Each of the PUCCH resource sets may include one or multiple PUCCH resources. Each of the PUCCH resource sets may be associated with a PUCCH resource set index. The PUCCH resource set index may be given by a higher layer parameter pucch-ResourceSetId. Each of the PUCCH resource sets may be associated with a maximum UCI information bit. The maximum UCI information bit may be configured for each of the PUCCH resource sets by a higher layer parameter maxPayloadSize. In a case that the terminal apparatus 1 transmits the UCI by using the PUCCH resource in a certain PUCCH resource set, the information bit of the UCI need not exceed the maximum UCI information bit configured in the certain PUCCH resource set.
The index of the PUCCH format may indicate any value from PUCCH format 0 to PUCCH format 4. The index of the PUCCH format may be indicated by a higher layer parameter format. For example, in a case that the format is format 0 (or PUCCH-format 0), the PUCCH may correspond to PUCCH format 0. In a case that the format is format 1 (or PUCCH-format 1), the PUCCH may correspond to PUCCH format 1. In a case that the format is format 2 (or PUCCH-format 2), the PUCCH may correspond to PUCCH format 2. In a case that the format is format 3 (or PUCCH-format 3), the PUCCH may correspond to PUCCH format 3. In a case that the format is format 4 (or PUCCH-format 4), the PUCCH may correspond to PUCCH format 4.
For example, the fact that a certain PUCCH corresponds to a certain PUCCH format may be that the certain PUCCH includes the certain PUCCH format. Furthermore, the fact that a certain PUCCH corresponds to a certain PUCCH format may be that the certain PUCCH is generated based on the certain PUCCH format. Here, the PUCCH format may include at least a part or all of a scrambling method of the PUCCH, a modulation scheme configuration of the PUCCH, a time domain resource configuration of the PUCCH, a frequency domain configuration of the PUCCH, and a DMRS configuration for the PUCCH. The fact that a certain higher layer parameter is configured for the PUCCH format may be that the PUCCH format includes the certain higher layer parameter or that the certain higher layer parameter characterizes the PUCCH format. In addition, the fact that a certain higher layer parameter is configured for each of the PUCCH formats may be that an n-th certain higher layer parameter is configured for an n-th PUCCH format. The n may be an integer of 1 or more.
The index of the first OFDM symbol of the PUCCH may be the index of the first OFDM symbol to which the PUCCH is mapped. The index of the first OFDM symbol of the PUCCH may be determined by a higher layer parameter startingSymbolIndex corresponding to the PUCCH format selected by the PUCCH format index.
The number of OFDM symbols of the PUCCH may be the number of OFDM symbols to which the PUCCH is mapped. The number of OFDM symbols of the PUCCH may be determined by a higher layer parameter nrofsymbols corresponding to the PUCCH format selected by the PUCCH format index.
The number of resource blocks MPUCCHRB of the PUCCH may be the maximum number of resource blocks to which the PUCCH is mapped. The number of resource blocks MPUCCHRB of the PUCCH may be determined by a higher layer parameter nrolfPRBs corresponding to the PUCCH format selected by the PUCCH format index.
The number of resource blocks MPUCCHRB, min of the PUCCH may be the number of resource blocks to which the PUCCH is mapped. The number of resource blocks MPUCCHRB, min of the PUCCH may be equal to the number of resource blocks MPUCCHRB of the PUCCH or may be less than the number of resource blocks MPUCCHRB of the PUCCH.
The number of resource blocks MPUCCHRB, min of the PUCCH may be determined based at least on Relationship 1 and/or Relationship 2 in a case that the PUCCH format for the PUCCH is the PUCCH format 2 or the PUCCH format 3 and the PUCCH includes at least one or both of the HARQ-ACK and the SR. The number of PUCCH resource blocks MPUCCHRB, mm may be determined in accordance with at least both Relationship 1 and Relationship 2 based at least on that the number of PUCCH resource blocks MPUCCHRB is greater than 1.
N
UCI
≤M
RB,min
PUCCH
·N
SC,ctrl
RB
·N
symb-UCI
PUCCH
·Q
m
·r [Math. 1]
N
UCI>(MRB,minPUCCH−1)·NSC,ctrlRB·Nsymb-UCIPUCCH·Qm·r [Math. 2]
NUCI may correspond to the number of uplink control information bits.
NRBSC, ctrl may be determined based on the number of subcarriers NRBSC per resource block. NRBSC, ctrl for the PUCCH format 2 may be given by NRBSC, ctrl−4 or (NRBSC, ctrl−4)/NPUCCH, 2SF. NRBSC, ctrl for the PUCCH format 3 may be given by NRBSC, ctrl or NRBSC, ctrl/NPUCCH, 3SF. NPUCCH, 2SF may be a value used for Spreading for PUCCH 2, and NPUCCH, 3SF may be a value used for Block-wise Spreading for PUCCH 3.
NPUCCHsymb-UCI may correspond to the number of OFDM symbols to which the PUCCH is mapped. NPUCCHsymb-UCI for the PUCCH format 2 may be given by nrofSymbols in a higher layer parameter PUCCH-format 2. NPUCCHsymb-UCI for the PUCCH format 3 may be a value obtained by subtracting the number of OFDM symbols used in DMRS transmission for the PUCCH format 3 from a value given by nrofSymbols in a higher layer parameter PUCCH-format 3. NPUCCHsymb-UCI for the PUCCH format 4 may be a value obtained by subtracting the number of OFDM symbols used in DMRS transmission for the PUCCH format 4 from a value given by nrofSymbols in a higher layer parameter PUCCH-format 4.
Qm may correspond to a Modulation Order of the PUCCH.
r may correspond to a maximum coding rate (or simply referred to as a coding rate) of the PUCCH. r may be determined by a higher layer parameter maxCodeRate for the PUCCH format 2, 3, or 4. The maxCodeRate may be configured for each of the PUCCH formats.
In the PUCCH format 1, 3, or 4, the number of slots NrepeatPUCCH may be configured for repetition of the PUCCH transmission. NrepeatPUCCH may be determined by a higher layer parameter NrofSlots for the PUCCH format. That is, the NrofSlots may be a higher layer parameter indicating the number of repetitions for the PUCCH format corresponding to the PUCCH transmission. In addition, the NrofSlots may be configured for each of the PUCCH formats. A value of the NrofSlots may be any of 2, 4, and 8. For example, in a case that the value of the NrofSlots is 2, NrepeatPUCCH may be 2. In a case that the NrofSlots is not configured for the PUCCH format, NrepeatPUCCH may be 1.
Based at least on the fact that NrepeatPUCCH is greater than 1, the terminal apparatus 1 may repeat the PUCCH transmission including the UCI in NrepeatPUCCH slots. The PUCCH transmissions in the NrepeatPUCCH slots may have the same number of OFDM symbols and may have the same first OFDM symbol index as each other. The number of OFDM symbols may be given by the higher layer parameter nrofSymbols corresponding to the PUCCH format selected by the PUCCH format index. The index of the first OFDM symbol may be given by the higher layer parameter startingSymbolIndex corresponding to the PUCCH format selected by the PUCCH format index. The NrepeatPUCCH PUCCH slots may or may not be continuous.
A PUCCH corresponding to PUCCH format 1, 3, or 4 may be configured to perform frequency hopping between different slots based at least on repetition of transmission of the PUCCH in NrepeatPUCCH slots. The frequency hopping may be performed on a per slot basis, the PUCCH may be transmitted based on a first PRB in an even-numbered slot, and the PUCCH may be transmitted based on a second PRB in an odd-numbered slot. The first PRB may be given by a higher layer parameter StartingPRB and the second PRB may be given by a higher layer parameter SecondHopPRB. With the slot designated for the first transmission of the PUCCH as zeroth slot, each subsequent slot until the PUCCH is transmitted in NrepeatPUCCH slots may be counted regardless of whether the terminal apparatus 1 transmits the PUCCH.
The terminal apparatus 1 need not expect that the frequency hopping is performed for the PUCCH transmission in a certain slot based at least on that the PUCCH transmission including the UCI is repeated in NrepeatPUCCH slots and that the frequency hopping is configured to be performed between different slots for the PUCCH transmission.
The frequency hopping from the first PRB provided by the higher layer parameter StartingPRB to the second PRB provided by the higher layer parameter SecondHopPRB may be the same in each slot based at least on that the PUCCH transmission including the UCI is repeated in NrepeatPUCCH slots, that the frequency hopping is not configured to be performed between different slots for the PUCCH transmission, and that the frequency hopping is configured to be performed within a slot for the PUCCH transmission.
The PUCCH 921 in the slot 932 may be a repetition of the PUCCH 920 in the slot 931. The DCI format in the PDCCH 910 may indicate transmission of the PUCCH 920 in the slot 931. In a case that the DCI format includes the PDSCH to HARQ feedback timing indicator field, a slot identified by the PDSCH to HARQ feedback timing indicator field may be the slot 931. The slot 931 and the slot 932 may be a part or all of NrepeatPUCCH slots. The slot 931 may be continuous with the slot 932. The slot 931 need not be continuous with the slot 932.
The number of repetitions for the PUCCH format corresponding to the PUCCH 920 may be indicated by the NrofSlots. That is, in a case that the NrofSlots is configured in the PUCCH format corresponding to the PUCCH 920, the number of repetitions of the PUCCH 920 may be a value indicated by the NrofSlots. A value of NrepeatPUCCH may be a value indicated by the NrofSlots. In a case that NrepeatPUCCH is 2, the repetition of the PUCCH 920 may be only the PUCCH 921. Furthermore, in a case that NrepeatPUCCH is 2, the repetition of the PUCCH may be the PUCCH 920 and the PUCCH 921.
The NrofSlots may be able to configure NRP1 types of numbers of repetitions. For example, in a case that NRP1 is 3, the value of the NrofSlots may be any one of 2, 4, and 8. That is, in a case that the NrofSlots is configured and NRP1 is 3, NrepeatPUCCH may be any one of 2, 4, and 8.
The DCI format in the PDCCH 910 may indicate the transmission of the PUCCH 920 and may not indicate transmission of the PUCCH 921. The terminal apparatus 1 may transmit the PUCCH 921 based on the number of repetitions for the PUCCH format corresponding to the PUCCH 920.
The PUCCH resource corresponding to the PUCCH 920 may be the same as the PUCCH resource corresponding to the PUCCH 921. In the terminal apparatus 1, the PUCCH resource corresponding to the PUCCH 920 may be indicated by the PDCCH 910. That is, the PUCCH resource indicator field in the DCI format included in the PDCCH 910 may indicate the PUCCH resource corresponding to the PUCCH 920.
The fact that the respective PUCCH resources corresponding to the PUCCH 920 and the PUCCH 921 are the same may be that the respective PUCCH formats corresponding to the PUCCH 920 and the PUCCH 921 are the same. The fact that the respective PUCCH resources corresponding to the PUCCH 920 and the PUCCH 921 are the same may be that indices of the respective PUCCH formats corresponding to the PUCCH 920 and the PUCCH 921 are the same.
The fact that the respective PUCCH formats corresponding to the PUCCH 920 and the PUCCH 921 are the same may be that one or multiple higher layer parameters configured for the respective PUCCH formats corresponding to the PUCCH 920 and the PUCCH 921 are the same.
The number of repetitions for the PUCCH 920 may be indicated based on the DCI format in the PDCCH 910. For example, the number of the repetitions may be indicated by a DCI field of the DCI format. The DCI field may be applied to the PUCCH transmission indicated by the DCI format. The DCI field may be referred to as a PUCCH-RepetitionFactor field.
The number of repetitions for the PUCCH 920 may be indicated based on the DCI format in the PDCCH 910. For example, the number of the repetitions may be configured for the PUCCH resource, and the PUCCH resource may be indicated by the PUCCH resource indicator field of the DCI format. The PUCCH resource may correspond to the PUCCH 920. That is, the number of repetitions may be configured for the PUCCH resource corresponding to the PUCCH 920 by a certain higher layer parameter. The certain higher layer parameter may be one element included in the PUCCH resource. The certain higher layer parameter may be referred to as RepetitionFactor-r17.
The terminal apparatus 1 may be given a configuration of two numbers of repetitions as a configuration of the PUCCH transmission. For example, a configuration of a first number of repetitions may be given for the PUCCH format corresponding to the PUCCH transmission and a configuration of a second number of repetitions may be given for the PUCCH transmission.
Thus, in order to determine the number of repetitions to be applied to a certain PUCCH transmission, one number of repetitions needs to be determined based on the configuration of the first number of repetitions and the configuration of the second number of repetitions. For example, procedure 1 and procedure 2 for determining one number of repetitions based on the configuration of two numbers of repetitions may be used to solve the above problem.
In the procedure 1, the RepetitionFactor-r17 may be able to configure NRP2 types of numbers of repetitions. For example, the RepetitionFactor-r17 may be configured by a higher layer. For example, in a case that NRP2 is 3, a value of the RepetitionFactor-r17 may be any one of 2, 4, and 8. For example, in a case that NRP2 is 4, the value of the RepetitionFactor-r17 may be any one of 1, 2, 4, and 8. For example, in a case that NRP2 is 5, the value of the RepetitionFactor-r17 may be any one of 1, 2, 4, 5, and 8. For example, in a case that NRP2 is 4, the value of the RepetitionFactor-r17 may be configurable to any one of A2, B2, C2, and D2. A2 may be an integer configured by the higher layer. B2 may be an integer configured by the higher layer. C2 may be an integer configured by the higher layer. D2 may be an integer configured by the higher layer. NRP2 may be different from NRP1.
In the procedure 1, the RepetitionFactor-r17 may be configured for each PUCCH resource. For example, in a case that a certain PUCCH resource set includes Nset PUCCH resources, the RepetitionFactor-r17 may be configured for each of the Nset PUCCH resources. For example, an n-th RepetitionFactor-r17 may be configured for an n-th PUCCH resource. The n may be an integer from 1 to Nset. Furthermore, in a case that a certain PUCCH resource set includes Nset PUCCH resources, the RepetitionFactor-r17 may be configured for each of the Nset, part PUCCH resources among the Nset PUCCH resources. For example, an npart-th RepetitionFactor-r17 may be configured for an npart-th PUCCH resource. The npart may be an integer from 1 to Nset, part. Nset may be 8, 16, or 32. Nset, part may be equal to Nset or less than Nset.
In the procedure 1, the value of the RepetitionFactor-r17 may be different from a value of the NrofSlots. That is, the RepetitionFactor-r17 may be configured independently of the NrofSlots. The NrofSlots may be configured independently of the RepetitionFactor-r17. For example, the RepetitionFactor-r17 configured for the PUCCH resource corresponding to the PUCCH 920 may be configured independently of the PUCCH format corresponding to the PUCCH 920. That is, in a case that the PUCCH format corresponding to the PUCCH 920 is 2, the RepetitonFactor-r17 may be configured for the PUCCH resource corresponding to the PUCCH 920.
The number of repetitions for the PUCCH resource corresponding to the PUCCH 920 may be indicated by the RepetitionFactor-r17. That is, in a case that the RepetitionFactor-r17 is configured for each PUCCH resource, the number of repetitions of the PUCCH 920 may be a value indicated by the RepetitionFactor-r17 configured for the PUCCH resource corresponding to the PUCCH 920. The value of NrepeatPUCCH may be a value indicated by the RepetitionFactor-r17. In a case that NrepeatPUCCH is 2, the repetition of the PUCCH 920 may be only the PUCCH 921. Furthermore, in a case that NrepeatPUCCH is 2, the repetition of the PUCCH may be the PUCCH 920 and the PUCCH 921.
In the procedure 1, the NrofSlots may be configured for the PUCCH format corresponding to the PUCCH 920, and the RepetitionFactor-r17 may be configured for the PUCCH resource corresponding to the PUCCH 920. The terminal apparatus 1 may determine one number of repetitions based on the NrofSlots and the RepetitionFactor-r17. The one number of repetitions may be the number of transmissions of the PUCCH including the PUCCH 920. The one number of repetitions may be the number of slots in which the PUCCH including the slot 931 is transmitted. The one number of repetitions may be determined to be NrepeatPUCCH.
In the procedure 1, prioritization may be done between the NrofSlots and the RepetitionFactor-r17. For example, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the RepetitionFactor-r17 is configured for the PUCCH resource corresponding to the PUCCH 920, the RepetitionFactor-r17 may have a higher priority than the NrofSlots. Furthermore, for example, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the RepetitionFactor-r17 is configured for the PUCCH resource corresponding to the PUCCH 920, one number of repetitions for the PUCCH 920 may be the value of the RepetitionFactor-r17.
In the procedure 1, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the RepetitionFactor-r17 is configured for the PUCCH resource corresponding to the PUCCH 920, the terminal apparatus 1 may ignore a configuration of the NrofSlots. Furthermore, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the RepetitionFactor-r17 is configured for the PUCCH resource corresponding to the PUCCH 920, NrepeatPUCCH may be the value of the RepetitionFactor-r17.
In the procedure 1, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the RepetitionFactor-r17 is not configured for the PUCCH resource corresponding to the PUCCH 920, one number of repetitions for the PUCCH 920 may be the value of the NrofSlots. Furthermore, in a case that the NrofSlots is not configured for the PUCCH format corresponding to the PUCCH 920 and the RepetitionFactor-r17 is configured for the PUCCH resource corresponding to the PUCCH 920, one number of repetitions for the PUCCH 920 may be the value of the RepetitionFactor-r17. Furthermore, in a case that the NrofSlots is not configured for the PUCCH format corresponding to the PUCCH 920 and the RepetitionFactor-r17 is not configured for the PUCCH resource corresponding to the PUCCH 920, one number of repetitions for the PUCCH 920 may be 1.
In the procedure 1, one number of repetitions determined based on the NrofSlots and the RepetitionFactor-r17 may be NrepeatPUCCH. In a case that the one number of repetitions is determined for the PUCCH 920 and the PUCCH 921 is the repetition of the PUCCH 920, the slot 930 and the slot 931 may be a part or all of NrepeatPUCCH slots.
In the procedure 2, the DCI format included in the PDCCH 910 may include the PUCCH-RepetitionFactor field for indicating the number of repetitions of the PUCCH 920. The PUCCH-RepetitionFactor field may be able to indicate NRP3 types of numbers of repetitions. For example, in a case that NRP3 is 3, a value of the PUCCH-RepetitionFactor field may be any one of 2, 4, and 8. For example, in a case that NRP3 is 4, the value of the PUCCH-RepetitionFactor field may be any one of 1, 2, 4, and 8. For example, in a case that NRP3 is 4, the value of the PUCCH-RepetitionFactor field may be configurable to any one of A3, B3, C3, and D3. A3 may be an integer configured by the higher layer. B3 may be an integer configured by the higher layer. C3 may be an integer configured by the higher layer. D3 may be an integer configured by the higher layer. NRP3 may be different from NRP1. The number of bits of the PUCCH-RepetitionFactor field may be log2(NRP3). For example, in a case that NRP3 is 4, the number of the bits may be 2. For example, in a case that NRP3 is 8, the number of the bits may be 3.
In the procedure 2, the number of repetitions corresponding to the PUCCH 920 may be indicated by the PUCCH-RepetitionFactor field. The number of repetitions of the PUCCH 920 may be the value of the PUCCH-RepetitionFactor field. The value of the PUCCH-RepetitionFactor field may be different from the value of the NrofSlots. The value of NrepeatPUCCH may be the value of the PUCCH-RepetitionFactor field. In a case that NrepeatPUCCH is 2, the repetition of the PUCCH 920 may be only the PUCCH 921. Furthermore, in a case that NrepeatPUCCH is 2, the repetition of the PUCCH may be the PUCCH 920 and the PUCCH 921.
In the procedure 2, the NrofSlots may be configured for the PUCCH format corresponding to the PUCCH 920, and the DCI format in the PDCCH 910 may include the PUCCH-RepetitionFactor field. The terminal apparatus 1 may determine one number of repetitions based on the NrofSlots and the PUCCH-RepetitionFactor field. The one number of repetitions may be the number of transmissions of the PUCCH including the PUCCH 920. The one number of repetitions may be the number of slots in which the PUCCH including the slot 931 is transmitted. The one number of repetitions may be determined to be NrepeatPUCCH.
In the procedure 2, prioritization may be done between the NrofSlots and the PUCCH-RepetitionFactor field. For example, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and monitoring of the DCI format including the PUCCH-RepetitionFactor field is configured, the PUCCH-RepetitionFactor field may have a higher priority than the NrofSlots. Furthermore, for example, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the DCI format in the PDCCH 910 includes the PUCCH-RepetitionFactor field, one number of repetitions for the PUCCH 920 may be the value of the PUCCH-RepetitionFactor field.
In the procedure 2, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the DCI format of the PDCCH 910 indicating the transmission of the PUCCH 920 includes the PUCCH-RepetitionFactor field, the terminal apparatus 1 may ignore the configuration of the NrofSlots. Furthermore, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the DCI format of the PDCCH 910 indicating the transmission of the PUCCH 920 includes the PUCCH-RepetitionFactor field, NrepeatPUCCH may be the value of the PUCCH-RepetitionFactor field.
In the procedure 2, in a case that the NrofSlots is configured for the PUCCH format corresponding to the PUCCH 920 and the DCI format in the PDCCH 910 does not include the PUCCH-RepetitionFactor field, one number of repetitions for the PUCCH 920 may be the value of the NrofSlots. Furthermore, in a case that the NrofSlots is not configured for the PUCCH format corresponding to the PUCCH 920 and the DCI format in the PDCCH 910 includes the PUCCH-RepetitionFactor field, one number of repetitions for the PUCCH 920 may be the value of the PUCCH-RepetitionFactor field. Furthermore, in a case that the NrofSlots is not configured for the PUCCH format corresponding to the PUCCH 920 and the DCI format in the PDCCH 910 does not include the PUCCH-RepetitionFactor field, one number of repetitions for the PUCCH 920 may be 1.
In the procedure 2, one number of repetitions determined based on the NrofSlots and the PUCCH-RepetitionFactor field may be NrepeatPUCCH. In a case that the one number of repetitions is determined for the PUCCH 920 and the PUCCH 921 is the repetition of the PUCCH 920, the slot 930 and the slot 931 may be a part or all of NrepeatPUCCH slots.
Various aspects of apparatuses according to an aspect of the present embodiment will be described below.
(1) In order to accomplish the object described above, an aspect of the present invention is contrived to provide the following means. That is, a first aspect of the present invention is a terminal apparatus and includes a reception circuitry that receives a PDCCH including a DCI format; and a transmission circuitry that transmits a PUCCH. The DCI format indicates transmission of the PUCCH. The reception circuitry receives a first higher layer parameter NrofSlots indicating a first number of repetitions for a PUCCH format corresponding to the transmission of the PUCCH and/or a second higher layer parameter RepetitionFactor-r17 indicating a second number of repetitions for a PUCCH resource corresponding to the transmission of the PUCCH. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is not configured, the number of repetitions of the PUCCH is the first number of repetitions. In a case that the NrofSlots is not configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions.
(2) A second aspect of the present invention is a terminal apparatus and includes a reception circuitry that receives a PDCCH including a DCI format; and a transmission circuitry that transmits a PUCCH. The DCI format indicates transmission of the PUCCH. The reception circuitry receives a first higher layer parameter NrofSlots indicating a first number of repetitions for a PUCCH format corresponding to the transmission of the PUCCH. In a case that the DCI format includes a certain DCI field, the number of repetitions of the PUCCH is a second number of repetitions. In a case that the DCI format does not include the certain DCI field, the number of repetitions of the PUCCH is the first number of repetitions. The certain DCI field indicates the second number of repetitions.
(3) A third aspect of the present invention is a base station apparatus and includes a transmission circuitry that transmits a PDCCH including a DCI format; and a reception circuitry that receives a PUCCH. The DCI format indicates transmission of the PUCCH. The transmission circuitry transmits a first higher layer parameter NrofSlots indicating a first number of repetitions for a PUCCH format corresponding to the transmission the PUCCH and/or a second higher layer parameter RepetitionFactor-r17 indicating a second number of repetitions for a PUCCH resource corresponding to the transmission of the PUCCH. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions. In a case that the NrofSlots is configured and the RepetitionFactor-r17 is not configured, the number of repetitions of the PUCCH is the first number of repetitions. In a case that the NrofSlots is not configured and the RepetitionFactor-r17 is configured, the number of repetitions of the PUCCH is the second number of repetitions.
(4) A fourth aspect of the present invention is a base station apparatus and includes a transmission circuitry that transmits a PDCCH including a DCI format; and a reception circuitry that receives a PUCCH. The DCI format indicates transmission of the PUCCH. The transmission circuitry transmits a first higher layer parameter NrofSlots indicating a first number of repetitions for a PUCCH format corresponding to the transmission of the PUCCH. In a case that the DCI format includes a certain DCI field, the number of repetitions of the PUCCH is a second number of repetitions. In a case that the DCI format does not include the certain DCI field, the number of repetitions of the PUCCH is the first number of repetitions. The certain DCI field indicates the second number of repetitions.
A program running on the base station apparatus 3 and the terminal apparatus 1 according to an aspect of the present invention may be a program (a program that causes a computer to function) that controls a Central Processing Unit (CPU) and the like so as to implement the functions of the above-described embodiment according to an aspect of the present invention. The information handled in these apparatuses is temporarily loaded into a Random Access Memory (RAM) while being processed, is then stored in a Hard Disk Drive (HDD) and various types of Read Only Memory (ROM) such as a Flash ROM, and is read, modified, and written by the CPU, as necessary.
Note that the terminal apparatus 1 and the base station apparatus 3 according to the above-described embodiment may be partially implemented by a computer. In that case, this configuration may be implemented by recording a program for implementing such control functions on a computer-readable recording medium and causing a computer system to read the program recorded on the recording medium for execution.
Note that it is assumed that the “computer system” mentioned here refers to a computer system built into the terminal apparatus 1 or the base station apparatus 3, and the computer system includes an OS and hardware components such as peripheral devices. A “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage apparatus such as a hard disk built into the computer system.
Moreover, the “computer-readable recording medium” may include a medium that dynamically stores a program for a short period of time, such as a communication line in a case that the program is transmitted over a network such as the Internet or over a communication line such as a telephone line, and may also include a medium that stores the program for a certain period of time, such as a volatile memory included in the computer system functioning as a server or a client in such a case. The above-described program may be one for implementing a part of the above-described functions, and also may be one capable of implementing the above-described functions in combination with a program already recorded in a computer system.
Furthermore, the base station apparatus 3 according to the aforementioned embodiment may be implemented as an aggregation (apparatus group) including multiple apparatuses. Each of the apparatuses included in such an apparatus group may include a part or all of each function or each functional block of the base station apparatus 3 according to the aforementioned embodiment. As the apparatus group, it is only necessary to have all of functions or functional blocks of the base station apparatus 3. Moreover, the terminal apparatus 1 according to the aforementioned embodiment can also communicate with the base station apparatus as the aggregation.
Also, the base station apparatus 3 according to the aforementioned embodiment may be an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and/or a NextGen RAN (NG-RAN or NR RAN). Moreover, the base station apparatus 3 according to the aforementioned embodiment may have a part or all of the functions of a higher node for an eNodeB and/or a gNB.
Also, a part or all portions of each of the terminal apparatus 1 and the base station apparatus 3 according to the aforementioned embodiment may be implemented as an LSI, which is typically an integrated circuit, or may be implemented as a chip set. The functional blocks of each of the terminal apparatus 1 and the base station apparatus 3 may be individually implemented as a chip, or a part or all of the functional blocks may be integrated into a chip. Furthermore, a circuit integration technique is not limited to the LSI and may be implemented with a dedicated circuit or a general-purpose processor. Moreover, in a case that a circuit integration technology that substitutes an LSI appears with the advance of the semiconductor technology, it is also possible to use an integrated circuit based on the technology.
In addition, although the aforementioned embodiments have described the terminal apparatus as an example of a communication apparatus, the present invention is not limited to such a terminal apparatus, and is also applicable to a terminal apparatus or a communication apparatus that is a stationary type or a non-movable type electronic apparatus installed indoors or outdoors, for example, such as an AV device, a kitchen device, a cleaning or washing machine, an air-conditioning device, office equipment, a vending machine, and other household appliances.
Although, the embodiments of the present invention have been described in detail above referring to the drawings, the specific configuration is not limited to the embodiments and includes, for example, design changes within the scope that does not depart from the gist of the present invention. For an aspect of the present invention, various modifications are possible within the scope of the claims, and embodiments that are made by suitably combining technical means disclosed according to the different embodiments are also included in the technical scope of the present invention. A configuration in which elements described in the respective embodiments and having mutually the similar effects, are substituted for one another is also included.
An aspect of the present invention can be utilized, for example, in a communication system, communication equipment (for example, a cellular phone apparatus, a base station apparatus, a wireless LAN apparatus, or a sensor device), an integrated circuit (for example, a communication chip), or a program.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-028481 | Feb 2021 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2022/007190 | 2/22/2022 | WO |
