WO2022215390A1 - 端末、基地局及び通信方法 - Google Patents
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Definitions
- the present disclosure relates to terminals, base stations, and communication methods.
- 5th Generation mobile communication systems offer large capacity and ultra-high speed (eMBB: enhanced Mobile Broadband), massive Machine Type Communication (mMTC), and ultra-reliable low latency (URLLC: Ultra Reliable and Low Latency Communication), it can flexibly provide wireless communication according to a wide variety of needs.
- eMBB enhanced Mobile Broadband
- mMTC massive Machine Type Communication
- URLLC Ultra Reliable and Low Latency Communication
- the 3rd Generation Partnership Project (3GPP) an international standardization body, is working on the specification of New Radio (NR) as one of the 5G radio interfaces.
- NR New Radio
- 3GPP TS38.104 “NR Base Station (BS) radio transmission and reception (Release 15),” December 2020. RP-202928, “New WID on NR coverage enhancements,” China Telecom, December 2020. 3GPP TS38.211, “NR Physical channels and modulation (Release 16),” December 2020. 3GPP TS38.212, “NR Multiplexing and channel coding (Release 16),” December 2020. 3GPP TS38.213, “NR Physical layer procedures for control (Release 16),” December 2020. 3GPP TS38.214, “NR Physical layer procedures for data (Release 16),” December 2020. R1-2102241, "FL summary of TB processing over multi-slot PUSCH (SI 8.8.1.2),” Moderator (Nokia, Nokia Shanghai Bell), January 25th-February 5th, 2021.
- the resources of different channels may overlap.
- the control (or operation) when resources of different channels overlap is left for consideration.
- Non-limiting embodiments of the present disclosure contribute to providing terminals, base stations, and communication methods that perform appropriate control when resources of different channels overlap.
- a terminal when transmission resources allocated for transmission of an uplink shared channel using a plurality of slots and transmission resources of an uplink control channel overlap in time, the plurality of A second resource amount used for transmitting uplink control information based on the size of data transmitted in the uplink shared channel in a slot and/or the first resource amount of the uplink shared channel in the plurality of slots and a transmission circuit for multiplexing and transmitting the uplink control information and the data in the resource of the determined second resource amount.
- appropriate control can be achieved when resources of different channels overlap.
- Embodiment 1 A diagram showing an example of modification 2
- Embodiment 2 Diagram showing an example of Embodiment 2
- Flowchart showing an operation example of Method 2 of Embodiment 3 Diagram showing an operation example of Method 2 of Embodiment 3
- FR1 Frequency Range 1
- LTE Long Term Evolution
- 3G 3rd Generation mobile communication systems
- Radio Access Technology Radio Access Technology
- the terminal transmits and receives data according to the resource allocation indicated by the layer 1 control signal (for example, DCI: Downlink Control Information) on the downlink control channel (PDCCH: Physical Downlink Control Channel) from the base station.
- DCI Downlink Control Information
- PDCCH Physical Downlink Control Channel
- a terminal uses a response signal (ACK/NACK: Acknowledgment/Negative Acknowledgment) indicating success or failure of decoding for a downlink data channel (PDSCH: Physical Downlink Shared Channel) using an uplink control channel (PUCCH: Physical Uplink Control Channel).
- ACK/NACK Acknowledgment/Negative Acknowledgment
- PUCCH Physical Uplink Control Channel
- the terminal can use PUCCH to transmit downlink channel state information (CSI: Channel State Information) indicating the state of the downlink channel to the base station in addition to ACK/NACK.
- CSI Downlink Channel State Information
- ACK/NACK and CSI are also called uplink control information (UCI), for example.
- transmitting at least one of data and control information using PUCCH may be abbreviated as “transmitting PUCCH” or “transmitting PUCCH”.
- receiving at least one of data and control information using PUCCH may be abbreviated as “receiving PUCCH” or “receiving PUCCH”.
- Other channels may also be abbreviated for at least one operation of transmission and reception, similar to PUCCH.
- Control information included in DCI may include information on PUCCH resources.
- the information on PUCCH resources may include information on the timing of transmitting PUCCH after how many slots from the slot in which the terminal received PDSCH. This timing information may be referred to as K1 or PDSCH-to-HARQ_feedback timing indication.
- HARQ is an abbreviation for Hybrid Automatic Repeat reQuest.
- the terminal transmits an uplink data channel (PUSCH: Physical Uplink Shared Channel) according to resource allocation (eg, Grant) indicated by DCI on PDCCH from the base station (eg, non-patent literature 3-6).
- resource allocation eg, Grant
- Control information included in DCI may include, for example, information on time domain resources for transmitting PUSCH.
- the information on the time domain resource is information on the timing of how many slots after the terminal receives the PDCCH from which the PUSCH is transmitted (for example, information called K2), or the position of the first PUSCH symbol in the slot.
- information called K2 information on the timing of how many slots after the terminal receives the PDCCH from which the PUSCH is transmitted
- it may be information about at least one of the number of symbols for transmitting PUSCH.
- the data size or transport block size is based on the resource amount per slot and/or the first PUSCH in Repetition It is determined based on the amount of resources allocated for transmission.
- the resource amount may be represented by, for example, the number of symbols or the number of resource elements.
- TBS may be described as TB size.
- NR Rel.17 when PUSCH is transmitted using multiple slots, a method of determining TBS based on the resource amount of the number of slots used for PUSCH transmission, slot units, or the first time in Repetition A method of determining the TBS by multiplying the TBS calculated from the amount of resources allocated for PUSCH transmission by a scaling factor greater than 1 is being studied (see Non-Patent Document 7, for example). Note that the method of calculating the TBS from the amount of resources allocated for each slot or the initial PUSCH transmission in Repetition may be, for example, the method specified in NR Rel.15/16 as described above.
- transmission resources for PUCCH and transmission resources for PUSCH may temporally overlap (collide).
- a resource in which a transmission resource for PUCCH and a transmission resource for PUSCH temporally overlap may be referred to as a resource (or slot) in which PUCCH and PUSCH collide.
- FIG. 1 is a diagram showing an example in which single-slot PUCCH transmission and PUSCH transmission using multiple slots overlap in time.
- FIG. 2 is a diagram showing an example in which multiple single-slot PUCCH transmissions and multiple-slot PUSCH transmissions overlap in time.
- the terminal may multiplex the UCI and uplink data on the PUSCH and transmit (for example, see Non-Patent Documents 4 and 5).
- a single-slot PUCCH transmission may temporally overlap with some slots of PUSCH transmission using multiple slots (for example, Repetition).
- the terminal may multiplex and transmit UCI and uplink data on PUSCH, for example, in slots where PUCCH transmission and PUSCH transmission temporally overlap (see Non-Patent Document 5, for example).
- a plurality of single-slot PUCCH transmission is a part of the PUSCH transmission using multiple slots (eg, Repetition) slots (in the example of FIG. 2, slot #0 and slot #2) may overlap in time.
- the terminal may multiplex and transmit UCI and uplink data on PUSCH in each slot where PUCCH transmission and PUSCH transmission temporally overlap.
- K r representing the code block size is a value determined by the amount of resource per slot or the amount of resource allocated to the initial PUSCH transmission in Repetition.
- the amount of UCI resources in the slot where the PUCCH and PUSCH collide is determined using equation (1), and the UCI and uplink data are multiplexed on the PUSCH and transmitted.
- a method for determining TBS based on the resource amount of the number of slots used for PUSCH transmission, and in slot units or in Repetition A method of determining the TBS by multiplying the TBS calculated from the amount of resources allocated for the first PUSCH transmission by a scaling factor greater than 1 will be considered. Below, the method for determining these two TBSs may be described as "the TBS determination method for Rel.17.”
- PUSCH transmission is under consideration, in which the TB of the TBS calculated by the TBS determination method of Rel. 17 described above is transmitted in multiple slots.
- a PUSCH transmission that transmits this TB in multiple slots may be referred to as TBoMS (TB processing over multi-slot) PUSCH or TBoMS transmission.
- Transmission resources for TBoMS transmission (transmission resources for PUSCH) and transmission resources for PUCCH may overlap in time.
- the UCI transmission method in this case has room for consideration.
- the amount of resources allocated to UCI can be calculated using the UCI resource amount calculation method of NR Rel. 15/16.
- UCI resource amount calculation method eg, equation (1)
- the number of PUSCH OFDM symbols N symb, all PUSCH is the number of symbols used for TBoMS transmission, that is, included in multiple slots. It is conceivable to calculate the amount of resources allocated to UCI by replacing the code block size (or TBS) K r with the number of symbols to be allocated and replacing the code block size (or TBS) K r with the TBS calculated by the TBS determination method of Rel.
- the UCI resource amount calculated by performing these replacements there is a possibility that the UCI cannot be appropriately mapped to the slot where the PUCCH and PUSCH collide.
- UCI may be mapped to multiple slots.
- UCI before multiplexing with uplink data can be transmitted using a single-slot PUCCH, whereas UCI after multiplexing with uplink data is mapped to multiple slots.
- UCI decoding delay and/or decoding throughput may increase.
- the tendency of at least one of UCI decoding delay and decoding processing amount to increase becomes noticeable.
- the slot where PUCCH and PUSCH collide is the last slot in TBoMS transmission, and UCI after multiplexing with uplink data is mapped to multiple slots, PUSCH resources for multiplexing UCI are insufficient. I have something to do.
- An object of the present invention is to provide a terminal, a base station, and a communication method that can appropriately determine the resource amount of UCI to be multiplexed on PUSCH when it is larger than the TBS calculated from the resource amount allocated to the first PUSCH transmission in Repetition.
- the resource amount of UCI multiplexed on PUSCH may be determined in slot units or based on the resource amount allocated to the first PUSCH transmission in Repetition.
- the number of OFDM symbols which is a parameter used to determine the amount of UCI resources
- the code block size (or TBS) which is a parameter used to determine the amount of UCI resources
- TBS the code block size (or TBS) transmitted in TBoMS.
- a communication system includes, for example, at least one base station and at least one terminal.
- FIG. 3 is a block diagram showing a configuration example of part of the base station 100 according to one embodiment of the present disclosure
- FIG. 4 shows a configuration example of part of the terminal 200 according to one embodiment of this disclosure. It is a block diagram.
- the control unit 101 assigns transmission resources for transmission of an uplink shared channel (PUSCH) using a plurality of slots and transmission resources for an uplink control channel (PUCCH).
- PUSCH uplink shared channel
- PUCCH uplink control channel
- the size of data transmitted in PUSCH in multiple slots eg, code block size or TBS
- TBS code block size
- UCI control information
- Receiving section 108 receives the UCI in the determined second resource amount and the multiplexed data.
- the control section 205 controls, for example, the transmission resources allocated for transmission of the uplink shared channel (PUSCH) using a plurality of slots and the transmission resources of the uplink control channel (PUCCH).
- PUSCH uplink shared channel
- PUCCH uplink control channel
- Uplink control based on the size of data transmitted in PUSCH in multiple slots (for example, code block size or TBS) and/or the first resource amount of PUSCH in multiple slots when overlapping in time
- a second amount of resources to be used for transmitting information (UCI) is determined.
- the transmitting unit 209 multiplexes and transmits, for example, the UCI in the determined second resource amount and the data.
- FIG. 5 is a block diagram showing a configuration example of the base station 100. As shown in FIG. The configuration example of the base station 100 illustrated in FIG. 5 may be common throughout the present disclosure including other embodiments and modifications described later.
- the base station 100 includes, for example, a control unit 101, a higher control signal generation unit 102, a downlink control information generation unit 103, an encoding unit 104, a modulation unit 105, a signal allocation unit 106, and a transmission A portion 107 may be provided. Also, the base station 100 may include a receiving section 108, an extracting section 109, a demodulating section 110, and a decoding section 111, for example.
- the control section 101 determines at least one of PDSCH reception information, PUSCH transmission information, and PUCCH transmission information for the terminal 200 and outputs the determined information to the higher control signal generation section 102 .
- the information on PDSCH reception and information on PUSCH transmission for example, at least one of information on the TDRA (Time Domain Resource Allocation) table and information on the number of transmission slots (eg, presence or absence of TBoMS transmission) may be included.
- the information on PUCCH transmission may include, for example, at least one of information on the PUCCH resource set and information on K1.
- control unit 101 determines, for example, a coding/modulation scheme and radio resource allocation for downlink data signals or higher control signals and downlink signals for transmitting downlink control information.
- the determined information may be output to encoding section 104, modulation section 105 and signal allocation section 106, for example.
- the coding/modulation scheme and radio resource allocation information for the data signal or higher control signal may be output to downlink control information generating section 103, for example.
- control section 101 may, for example, determine PUCCH resources for terminal 200 to transmit PUCCH, and output the determined information to higher control signal generation section 102 or downlink control information generation section 103 . Also, the control unit 101 outputs the determined information to the extraction unit 109, the demodulation unit 110, and the decoding unit 111, for example.
- control unit 101 determines the coding/modulation scheme and radio resource allocation for the terminal 200 to transmit an uplink data signal, and transmits the determined information to the downlink control information generating unit 103, the extracting unit 109, and the demodulating unit. 110 and the decoding unit 111 . Also, the control unit 101 determines, for example, a TBS and outputs information about the determined TBS to the decoding unit 111 .
- control section 101 determines whether or not TBoMS transmission is applied in PUSCH transmission, and whether PUCCH resources for transmitting PUCCH (eg, UCI) and radio resources for transmitting uplink data overlap in time. You may judge whether or not If the resources overlap in time, the control unit 101 may specify, for example, the amount of UCI resources in PUSCH. The specified information may be output to the extraction section 109, the demodulation section 110, and the decoding section 111, for example. Note that "specify” may be read interchangeably with other terms such as “determination”, “calculation”, and “calculation”.
- the upper control signal generation section 102 generates an upper layer control signal (eg, bit string) using control information input from the control section 101, for example.
- the generated signal may be output to the encoding unit 104, for example.
- Downlink control information generating section 103 may generate DCI (for example, a bit string) using, for example, control information input from control section 101 and output the generated DCI to encoding section 104 . Note that control information may be transmitted to multiple terminals 200 .
- Coding section 104 encodes, for example, downlink data, a bit string obtained from higher control signal generating section 102, or DCI input from downlink control information generating section 103, and outputs the coded bit string to modulating section 105. do.
- Modulation section 105 modulates, for example, the encoded bit string received from encoding section 104 and outputs it to signal allocation section 106 .
- the signal allocation section 106 maps downlink data signals or control signals input as a symbol string from the modulation section 105 to radio resources instructed by the control section 101 . Also, the signal allocation unit 106 inputs, for example, signals mapped to radio resources to the transmission unit 107 .
- the transmission section 107 performs transmission waveform generation such as OFDM (Orthogonal Frequency Division Multiplexing) on the signal output from the signal allocation section 106 .
- transmission waveform generation such as OFDM (Orthogonal Frequency Division Multiplexing)
- OFDM Orthogonal Frequency Division Multiplexing
- transmitting section 107 may add CP to the signal after applying IFFT (Inverse Fast Fourier Transform).
- the transmitting unit 107 for example, the signal output from the signal allocation unit 106, digital-analog (D / A) conversion, such as up-conversion radio (for example, RF: Radio Frequency) processing, antenna A radio signal is transmitted to the terminal 200 via the terminal 200 .
- D / A digital-analog
- RF Radio Frequency
- the receiving unit 108 performs RF processing such as down-conversion and analog-digital (A/D) conversion on an uplink signal transmitted from the terminal 200 and received via an antenna.
- RF processing such as down-conversion and analog-digital (A/D) conversion
- receiving section 108 generates a frequency domain signal by applying FFT to the received signal and outputs it to extraction section 109 .
- Extraction section 109 extracts, for example, the radio resource portion in which PUSCH or PUCCH is transmitted from the received signal based on the information received from control section 101, and outputs the extracted PUSCH or PUCCH signal to demodulation section 110.
- Demodulation section 110 demodulates PUSCH or PUCCH, for example, based on information received from control section 101 , and outputs the demodulation result to decoding section 111 .
- Decoding section 111 for example, using the information received from control section 101 and the demodulation result obtained from demodulation section 110, performs error correction decoding of PUSCH or PUCCH, and decodes a received bit string (for example, UL data signal or UCI).
- the terminal 200 may include a receiver 201, an extractor 202, a demodulator 203, a decoder 204, and a controller 205, for example.
- Terminal 200 may also include encoding section 206, modulation section 207, signal allocation section 208, and transmission section 209, for example.
- the receiving unit 201 receives, for example, a data signal or a downlink control signal transmitted from the base station 100 via an antenna, performs RF processing such as down-conversion or A/D conversion on the received radio signal, and converts it into a base. Generate a band signal.
- the receiving section 201 may perform FFT processing on the received signal and transform the received signal into the frequency domain.
- the extracting unit 202 extracts, for example, the radio resource part containing the downlink control signal from the received signal received from the receiving unit 201 using information about the radio resource of the control signal input from the control unit 205, and extracts The demodulated signal is output to demodulation section 203 . Also, extraction section 202 extracts a radio resource portion containing the data signal using, for example, information about the radio resource of the data signal input from control section 205 , and outputs the extracted signal to demodulation section 203 .
- the demodulation section 203 demodulates the PDCCH or PDSCH, for example, based on the information received from the control section 205, and outputs the demodulation result to the decoding section 204.
- decoding section 204 for example, using the information received from control section 205 and the demodulation result obtained in demodulation section 203, performs error correction decoding of PDCCH or PDSCH, downlink received data, higher layer control information, or obtain downlink control information.
- the obtained higher layer control information and downlink control information may be output to control section 205, for example.
- the decoding unit 204 may generate an ACK/NACK signal from the decoding result of the downlink received data, for example.
- the control section 205 identifies (or determines) radio resources for PDSCH reception, PUSCH transmission and PUCCH transmission, for example, based on radio resource allocation information obtained from higher layer control signals and downlink control information. Control section 205 also outputs the determined information to signal allocation section 208 , extraction section 202 and demodulation section 203 , for example.
- control unit 205 determines whether or not TBoMS transmission is applied in PUSCH transmission, and/or whether PUCCH resources for transmitting PUCCH and radio resources for transmitting uplink data overlap in time. You can judge. If resources overlap in time, the control section 205 may specify the amount of UCI resources in PUSCH. The specified information may be output to encoding section 206, modulation section 207 and signal allocation section 208, for example.
- the encoding section 206 encodes the UCI or uplink data signal, for example, based on the information input from the control section 205, and outputs the encoded bit string to the modulation section 207.
- Modulation section 207 for example, modulates the encoded bit sequence received from encoding section 206 to generate a modulation symbol sequence, and outputs the modulation symbol sequence to signal allocation section 208 .
- the signal allocation section 208 maps the signal input from the modulation section 207 to the radio resource instructed by the control section 205 . Also, the signal allocation section 208 inputs the signal mapped to the radio resource to the transmission section 209, for example.
- the transmission section 209 performs transmission signal waveform generation such as OFDM on the signal input from the signal allocation section 208 .
- the transmitting unit 209 may add CP to the signal after IFFT, for example.
- a DFT section may be provided after modulation section 207 or before signal allocation section 208 .
- the transmitting unit 209 performs RF processing such as D/A conversion and up-conversion on the transmission signal, for example, and transmits the radio signal via an antenna.
- the number of OFDM symbols and code block size (or TBS), which are parameters used to determine the amount of UCI resources, are, for example, slot units or the amount of resources allocated for the first PUSCH transmission in Repetition. decision based on Note that the resource amount may be defined by, for example, symbols or the number of resource elements.
- TBS calculation method for PUSCH transmission (TBoMS transmission) using multiple slots A method of calculating TBS for TBoMS transmission will be described.
- the TBS transmitted in TBoMS may be calculated by any of the following methods. Note that “calculation” may be read interchangeably with other terms such as “derivation” and “determination”.
- TBS-Approach 1 TBS is determined based on the resource amount of the number of slots used for PUSCH transmission.
- the number of slots used for PUSCH transmission is an integer of 2 or more.
- the resource amount N RE of the number of slots used for PUSCH transmission may be calculated by the following equation (2). Note that N RE is the amount of resources represented by the number of resource elements.
- N' RE indicates the number of REs allocated in multiple slots used for PUSCH transmission.
- N′ RE may indicate the total number of REs in one resource block in each of N slots used for PUSCH transmission.
- N' RE may be calculated by Equation (3) below.
- the TB size N info may be calculated by the following formula (4) using the resource amount N RE of the number of slots used for PUSCH transmission calculated by formula (2).
- TBS-Approach 2 the TBS calculated in slot units or from the amount of resources allocated to the initial PUSCH transmission in Repetition is multiplied by a scaling factor greater than 1 to determine the TBS.
- the resource amount N RE allocated to the first PUSCH transmission in slot units or Repetition may be calculated by the following equation (5). Note that N RE is the amount of resources represented by the number of resource elements.
- the upper limit of the number of REs in a slot may be set to 156, for example, as in equation (2). Note that the upper limit is not limited to 156.
- N' RE may be calculated by, for example, Equation (6) below.
- the number of OFDM symbols assigned to the first PUSCH transmission in slot units or Repetition may be notified to terminal 200 by information on the symbol length of Time Domain Resource Allocation (TDRA). good.
- TDRA Time Domain Resource Allocation
- the TB size N info may be calculated, for example, by the following formula (7) using the resource amount N RE allocated to the first PUSCH transmission in slot units or repetitions calculated by formula (5).
- the TBS calculation method is not limited to the above-described method.
- the TBS transmitted by TBoMS is a value larger than the TBS calculated from the amount of resources allocated for each slot or the first PUSCH transmission in Repetition. I wish I had.
- a TB with a TB size determined by the method described above may be transmitted using multiple slots according to the following method.
- a Circular Buffer is used in retransmission control.
- a Circular Buffer is a memory that stores the encoder output.
- the Circular Buffer reads the encoder output of the number of bits corresponding to the allocated resource amount from a predetermined read start position (RV: Redundancy Version) in the Circular Buffer.
- RV Redundancy Version
- the encoder output of the number of bits corresponding to the resource amount of the number of slots used for PUSCH transmission may be read from a predetermined RV position and mapped to PUSCH resources over multiple slots.
- RM-Approach 2 for example, the encoder output of the number of bits according to the resource amount allocated to the first PUSCH transmission in slot units or Repetition is read from a predetermined RV position, and each slot or Repetition PUSCH resource can be mapped. Also, RV may be changed between slots or between repetitions.
- the amount of UCI resources to allocate on PUSCH may be determined, for example, in units of slots or based on the amount of resources to allocate to the initial PUSCH transmission in Repetition.
- the UCI resource amount may be represented by the number of resource elements, and the resource amount allocated to the first PUSCH transmission in slot units or Repetition may be represented by the number of symbols or the number of resource elements.
- the UCI resource amount may be calculated by Equation (8) below.
- Equation (8) for determining the amount of UCI resources in Embodiment 1 is obtained by replacing N symb, all PUSCH in Equation (1) with N symb, nominal PUSCH .
- N symb, all PUSCH in equation (1) represents the number of OFDM symbols of PUSCH in each slot
- N symb, nominal PUSCH in equation (8) is per slot or for the first PUSCH transmission in Repetition Represents the number of OFDM symbols to be allocated.
- the number of OFDM symbols N symb, nominal PUSCH , assigned to the first PUSCH transmission in slot units or Repetition may be notified to terminal 200 by information on the symbol length of TDRA.
- K r in Equation (1) is replaced with K r,nominal .
- K r,nominal represents the code block size (or TBS) of the r-th code block calculated in slot units or based on the amount of resources allocated to the first PUSCH transmission in Repetition.
- K 0,nominal may be calculated by the following equation (9) based on the N RE obtained using equations (5) and (6).
- FIG. 7 is a flowchart showing an operation example of terminal 200 according to the first embodiment.
- the terminal 200 determines whether or not the transmission resources for PUCCH transmission and PUSCH transmission temporally overlap (S11).
- terminal 200 transmits UCI using PUCCH of non-overlapping transmission resources (S12). Then, the flow of FIG. 7 ends.
- terminal 200 determines whether or not PUSCH transmission (TBoMS transmission) using multiple slots is applied (S13). .
- terminal 200 determines TBS by ⁇ TBS-Approach 1> or ⁇ TBS-Approach 2> described above (S14). .
- the terminal 200 determines the resource amount of UCI to be multiplexed on the PUSCH, and maps the UCI of the determined resource amount to the PUSCH resource (S15).
- the terminal 200 maps the uplink data rate-adjusted by ⁇ RM-Approach 1> or ⁇ RM-Approach 2> described above to PUSCH resources (S16).
- the terminal 200 multiplexes the UCI and uplink data on the PUSCH and transmits (S17). Then, the flow of FIG. 7 ends.
- terminal 200 determines TBS in slot units (S18).
- the terminal 200 determines the amount of UCI resources to be multiplexed on the PUSCH on a slot-by-slot basis, and maps the UCI of the determined resource amount to the PUSCH resources (S19).
- the terminal 200 maps uplink data to PUSCH resources on a slot-by-slot basis (S20).
- the terminal 200 multiplexes the UCI and uplink data on the PUSCH and transmits (S21). Then, the flow of FIG. 7 ends.
- the UCI resource amount of the UCI multiplexed on the PUSCH in each slot can be calculated from the parameter for each slot, so that it is possible to prevent the UCI from being mapped to multiple slots.
- Modification 1 In slots where PUCCH and PUSCH transmission resources temporally overlap, the method of determining the amount of UCI resources to allocate to PUSCH is not limited to the above example.
- the number of OFDM symbols assigned to the first PUSCH transmission in slot units or Repetition, the number of slots used for TBoMS transmission (that is, multiple slots) TBS determined based on the amount of resources, and TBoMS and the number of OFDM symbols over multiple slots used for transmission are used to determine the amount of UCI resources.
- the UCI resource amount may be calculated by the following equation (11).
- the number of OFDM symbols N symb,all PUSCH of PUSCH in Equation (11) may be replaced with the number of symbols used for TBoMS transmission (that is, the number of symbols included in multiple slots).
- the code block size (or TBS) Kr may be replaced with the TBS calculated by ⁇ TBS-Approach 1> or ⁇ TBS-Approach 2> above.
- the second element of the min function on the right side of equation (11) is a term representing the upper limit of the amount of resources allocated to UCI within PUSCH.
- N symb which is a parameter that configures the second element of the min function in Equation (11), is a slot unit or the number of OFDM symbols assigned to the first PUSCH transmission in Repetition is used. be done.
- equation (11) for example, the smaller of the first element and the second element is selected for the min function, so if the second element of the min function is the upper limit, the first element of the min function is Represents the amount of resources before reaching the upper limit.
- the upper limit of the amount of UCI resources (UCI resource amount) multiplexed on the PUSCH in each slot (for example, the second element of the min function in Equation (11)) is set as a parameter for each slot (for example, N symb, nominal PUSCH ), UCI can be prevented from being mapped to multiple slots.
- the number of PUSCH resource elements over multiple slots eg, N symb, all PUSCH in equation (11)
- the TBS of TBoMS eg, K r in equation (11)
- the first element of the min function in Equation (11) can be set, so it is possible to set the UCI resource amount based on the correct number of resource elements in multiple slots.
- this modification when the number of resource elements in each slot is different, and/or the number of resource elements assigned to the first PUSCH transmission in Repetition and the number of resource elements assigned to PUSCH transmissions other than the first time are different. effective when the number of resource elements in each slot is different, and/or the number of resource elements assigned to the first PUSCH transmission in Repetition and the number of resource elements assigned to PUSCH transmissions other than the first time are different. effective when
- Modification 2 the method of calculating the amount of UCI resources may be varied depending on which slot PUCCH collides with among a plurality of slots used for PUSCH transmission.
- FIGS. 8A and 8B are diagrams showing an example of modification 2.
- the first slot of TBoMS transmission (slot #0 in FIG. 8A) collides with PUCCH, and as shown in FIG.
- the calculation method of the UCI resource amount may be changed depending on the case where slot #1) and PUCCH collide.
- UCI resource determination method 1 (Scheme 1 in FIG. 8A), which will be described later, is applied, and the PUCCH collides with slots other than the first slot.
- UCI resource determination method 2 (Scheme 2 in FIG. 8B), which will be described later, may be applied.
- the number of PUSCH OFDM symbols N symb,all PUSCH in Equation (1) is replaced with the number of symbols used for TBoMS transmission (that is, the number of symbols included in multiple slots).
- the code block size (or TBS) K r in equation (1) is replaced with the value calculated by ⁇ TBS-Approach 1> or ⁇ TBS-Approach 2> described above.
- UCI resource determination method 2 may be the method of Embodiment 1 or Modification 1 described above.
- the UCI after being multiplexed on the PUSCH is mapped to multiple slots other than the first slot, so it is possible to prevent a shortage of PUSCH resources for multiplexing the UCI.
- the first slot even if the UCI after being multiplexed on the PUSCH is mapped to multiple slots, there is no shortage of PUSCH resources for UCI multiplexing.
- Modification 3 the calculation method of the UCI resource amount may be varied depending on which slot PUCCH collides with among multiple slots used for TBoMS transmission.
- the UCI resource amount may be calculated by the following equation (12).
- the number of OFDM symbols N symb,all PUSCH of PUSCH in Equation (12) may be replaced with the number of symbols used for TBoMS transmission (that is, the number of symbols included in multiple slots).
- Code block size (or TBS) Kr may be replaced with ⁇ TBS-Approach 1> or ⁇ TBS-Approach 2> described above.
- Equation (12) the second element of the min function on the right side of Equation (12) is a term representing the upper limit of the amount of resources allocated to UCI within PUSCH.
- N symb, remaining PUSCH which is a parameter that configures the second element of the min function on the right side of Equation (12), includes slots in which PUCCH collided among multiple slots used for TBoMS transmission, and The number of OFDM symbols contained in subsequent slots is used.
- TBS setting method (calculation method) is not limited to the example described above. Below is a supplementary explanation of how to set up TBS.
- the TB size may be configured based on the number of resources (eg, number of slots) of the TBoMS transmission.
- the TB size may be set based on the number of slots (eg, time intervals) used for one of the multiple slots of the TBoMS transmission.
- the TB size (e.g., number of information bits) is set based on the value (e.g., also called intermediate variable) "N info " calculated according to the following equation (13) ( TS38.214 V16.1.0 section 5.1.3 and 6.1.4).
- the TB size may be determined by further adjustment according to the value of N info , for example. For example, the larger the value of N info , the larger the TB size may be set.
- the TB size is set based on N info calculated according to the following equation (14). good.
- Equation (14) for example, the larger the number of N MSs , the larger the TB size is set. Therefore, for example, the greater the number of NMSs, the greater the number of information bits transmitted in each slot used for TBoMS transmission, thereby improving user throughput.
- TBoMS transmission can use more slots in the RTT (Round Trip Time) without increasing the number of HARQ processes.
- RTT Random Trip Time
- NTN Non-Terrestrial Network
- TBoMS transmission increases the TB size based on an increase in the number of slots used for data transmission, so the actual coding rate (eg, MCS) is set when no TBoMS transmission is performed. It can be set in the same way as the coding rate (eg MCS). Therefore, even in the case of TBoMS transmission, it is possible to suppress a decrease in spectral efficiency and to perform transmission at a necessary and sufficient error rate (for example, BLER: Block Error Rate).
- MCS Physical channels Coding rate
- N MS for example, which one of formula (13) and formula (14) is applied
- N MS is determined, for example, by an RRC (Radio Resource Control) message (or It may be separately notified to terminal 200 by RRC signaling, also called higher layer parameter), MAC CE (Control Element), or DCI.
- RRC Radio Resource Control
- MAC CE Control Element
- DCI Data Control
- Equation (14) a larger TB size can be set to improve throughput.
- a smaller TB size can be set to improve reliability (in other words, transmission at a low error rate). can.
- HARQ for example, setting "HARQ-feedback disable" for traffic that requires low delay is being considered. If HARQ retransmission is disabled, no HARQ retransmission is performed, so a more reliable (eg, lower error rate) transmission is expected.
- N MS may be applied in setting the TB size to .
- base station 100 and terminal 200 when retransmission control by HARQ is applied (for example, when "HARQ-feedback enable" is set), or data to which retransmission control by HARQ is applied (or HARQ process), the TB size may be determined based on N MS according to equation (14).
- N MS in TB size setting as shown in equation (13) is not applied, it is possible to improve reliability (for example, transmission at a low error rate).
- N MS (or a parameter for deriving the number of resources for TBoMS transmission) may be notified to terminal 200 by at least one of an RRC message and DCI, for example.
- RRC message for example, "pdsch-AggregationFactor” (message for downlink) specified in TS38.331 V16.1.0, “pusch-AggregationFactor” (message for uplink), or “repK” in “ConfigureGrantConfig” (parameters for uplink Configured grant) may be used, or other messages may be used.
- a plurality of candidates are notified (or configured) to terminal 200 by an RRC message, and one of the plurality of candidates is determined by DCI for each PDSCH or PUSCH assignment (for example, scheduling information).
- the terminal 200 may be notified.
- an RRC message that sets multiple candidates for example, "PDSCH-TimeDomainResourceAllocationList-r16" (downlink message) or "PUSCH-TimeDomainResourceAllocationList-r16" (uplink message) "repetitionNumber- r16" may be used, and other messages may be used.
- the notification mechanism of the existing standards can be reused, so the complexity of processing in the terminal 200 can be reduced.
- scheduling information is notified to terminal 200 by DCI at the time of initial transmission, and in consecutive slots, the same TB based on the scheduling information (for example, the same TB size data) may be transmitted. In other words, scheduling information may not be reported by DCI in each slot after the slot corresponding to the initial transmission of TBoMS transmission.
- the TB size may be set based on a scaling factor (or referred to as scaling factor).
- the TB size may be set based on a TB size scaling factor in multiple slots (eg, time intervals) used for TBoMS transmission.
- the TB size may be set based on N info calculated according to the following equation (15).
- scaling coefficient setting methods include a method of semi-static setting (or notification) to terminal 200 using an RRC message, and a method of dynamic setting (or notification) to terminal 200 using DCI.
- a value of 1 or more may be set for the scaling factor.
- the scaling factor may be, for example, an integer value or a decimal value. If the scaling factor is set to a fractional value, a ceiling or floor operation may be performed in equation (3).
- the scaling factor may be semi-statically notified to terminal 200 by an RRC message.
- RRC message that sets the scaling factor 'PDSCH-TimeDomainResourceAllocationList' or 'PUSCH-TimeDomainResourceAllocationList' may be used, 'PDSCH-Config' or 'PUSCH-Config' may be used, and other messages may be used.
- a scaling factor may be applied in TB sizing when TBoMS transmission is performed (eg, application of Equation (15)).
- no scaling factor may be applied in TB sizing (eg, applying equation (13)).
- the base station 100 and the terminal 200 may, for example, determine the TB size based on the scaling factor when TBoMS transmission is applied, and may not be based on the scaling factor when TBoMS transmission is not applied.
- terminal 200 may be notified of information indicating whether or not to apply a scaling factor in setting the TB size. Information indicating whether to apply the scaling factor may be notified to terminal 200 by DCI for each data scheduling, for example.
- the scaling factor may be set individually for each HARQ process, for example.
- a scaling factor is applied to a HARQ process in which TBoMS transmission is performed, and a scaling factor is not applied to a HARQ process in which TBoMS transmission is not performed. good.
- the scaling factor may be notified to terminal 200 by DCI that notifies data scheduling information.
- a plurality of scaling factor candidates may be set in terminal 200 by an RRC message, and any one of the plurality of scaling factor candidates may be notified to terminal 200 by DCI for each data scheduling.
- the scaling factor may be included in information (eg, time domain resource allocation pattern) regarding time domain resource allocation (eg, Time Domain Resource Allocation (TDRA)).
- TDRA information may be represented, for example, in a tabular format (eg, a TDRA table).
- scaling factors may be defined in the TDRA table.
- multiple candidates for TDRA information are set in terminal 200 by an RRC message (eg, PDSCH-TimeDomainResourceAllocationList-r16 or PUSCH-TimeDomainResourceAllocationList-r16), and DCI allocates any one of the multiple candidates.
- a pattern (including a scaling factor) may be notified to terminal 200 .
- the scaling factor may be included in information including a scaling factor (eg, a value of 1 or less) for paging or random access processing (eg, Random Access Channel (RACH) response).
- Information including scaling for paging or random access processing may be represented by a table, for example.
- the scaling factors may be defined in a table containing scaling factors for paging or random access processing.
- paging e.g., P-RNTI (Paging-Radio Network Temporary ID)
- random access processing e.g., RA-
- a table may be defined that includes scaling factors (eg, values of 1 or less) for TBoMS transmissions (eg, values of 1 or greater) in addition to scaling factors (eg, values of 1 or greater) for Random Access-RNTI (RNTI).
- scaling factors e.g, values of 1 or less
- TBoMS transmissions eg, values of 1 or greater
- scaling factors eg, values of 1 or greater
- RNTI Random Access-RNTI
- multiple candidates for the scaling factor are configured in terminal 200 by an RRC message, and any one scaling factor among the multiple candidates is notified to terminal 200 by DCI (eg, TB scaling field). good.
- DCI eg, TB scaling field
- the scaling factor can be notified in the notification mechanism of the existing standard, so the complexity of the processing in the terminal 200 can be reduced.
- configuration method 2 for example, by expanding the TB size based on the scaling factor in multiple slots used for TBoMS transmission, more slots in the RTT can be used without increasing the number of HARQ processes. can. For example, in environments such as NTN environments where the RTT is extremely long compared to the slot length, user throughput can be improved by expanding the TB size based on the scaling factor without increasing the number of HARQ processes.
- the actual coding rate (eg, MCS) can be controlled, for example, based on the scaling factor. Therefore, even when performing TBoMS transmission, by controlling the scaling factor (or coding rate or MCS), it is possible to suppress the decrease in spectral efficiency (Spectral efficiency), and transmission at a necessary and sufficient error rate (for example, BLER) is possible.
- a scaling factor can be set for terminal 200 independently of the number of slots for TBoMS transmission. Therefore, for example, even if the number of slots for TBoMS transmission is not explicitly notified to terminal 200, base station 100 and terminal 200 use the scaling factor to determine the TB size based on the number of times of transmission of the same TB or the number of slots. can be set.
- the larger the value set for the scaling factor the larger the amount of data to be transmitted and the lower the transmission reliability.
- the smaller the value set for the scaling factor the smaller the amount of transmission data and the higher the transmission reliability.
- Setting method 1 and setting method 2 may be combined.
- the TB size may be set based on both N MS and scaling factor N scaling .
- N MS may be multiplied by a scaling factor N scaling for Equation (13).
- base station 100 and terminal 200 determine the TB size based on N MS or scaling factor N scaling .
- the number of HARQ processes specified in Rel.15/16 e.g., maximum 16
- the number of information bits that can be transmitted within the RTT can be increased by extending the TB size in each HARQ process based on the number of slots used for TBoMS transmission, thereby improving user throughput.
- the increase in the number of HARQ processes can be suppressed by improving the user throughput by expanding the TB size. Therefore, for example, it is possible to suppress an increase in the required HARQ buffer amount in the base station 100 or the terminal 200, and to suppress the occurrence of new rules such as the method of notifying the number of processes, so that the complexity of the terminal 200, the base station 100 and the wireless communication system can be reduced. It can suppress the increase in sexuality.
- the TB size may be determined based on the number of slots N MS or the scaling factor N scaling after increasing the number of HARQ processes to some extent (for example, up to 32). In this case, since N MS or scaling factor N scaling for transmitting a sufficient number of information bits within the RTT can be suppressed to some extent, the TB size does not become too large.
- the upper limit value of the scaling factor for setting the TB size may be set to, for example, the number of RTT (slot)/HARQ processes, or may be set to the number of slots for TBoMS transmission that can be set.
- the applicability of N MS or N scaling to the TB size setting may be notified to terminal 200 by System Information Block (SIB) for each cell.
- SIB System Information Block
- the applicability of N MS or N scaling to TB size setting may be set and notified for each terminal 200 according to the capability of terminal 200 (for example, UE capability), for example.
- terminal 200 notifies base station 100 of whether or not N MS or N scaling is applicable or the upper limit of applicable N MS or N scaling , and base station 100 applies N MS or N scaling based on the notification from terminal 200. May be set.
- the TB size calculated by applying N MS or N scaling may be set within a range that does not exceed the upper limit of the TB size supported by terminal 200 .
- the TB size is set based on, for example, "N info " represented by formula (13) described in TS38.214 V16.1.0 section 5.1.3 (PDSCH) and 6.1.4 (PUSCH) may be
- N info represented by formula (13) described in TS38.214 V16.1.0 section 5.1.3 (PDSCH) and 6.1.4 (PUSCH) may be
- the value of N info is determined based on the number of slots used for PDSCH or PUSCH transmission.
- N RE the number of REs used for data transmission
- the N info calculation formula e.g., formula (13)
- slots used for PUSCH transmission in other words, transmission signal or reception signal
- a number-based value may be calculated.
- N RE may be represented by the following equation (16).
- N'RE indicates the number of REs in one resource block (Resource Block (RB) or Physical Resource Block (PRB)) in a slot used for data transmission
- n PRB is data indicates the number of resource blocks allocated to
- the upper limit of the number of REs in a slot used for calculating the TB size is set to 156 so that the TB size does not exceed the data rate supported by the terminal 200 . Note that the upper limit is not limited to 156.
- N RE may be calculated according to the following equation (17).
- N' RE denotes the number of REs allocated in multiple slots used for data (eg, PDSCH or PUSCH) transmission.
- N′ RE may indicate the total number of REs in one resource block in each of N slots used for data transmission.
- N slot indicates the number of slots used for data (eg, PDSCH or PUSCH) transmission.
- N' RE may be calculated according to the following equation (18).
- the No oh PRB may be notified to terminal 200 by, for example, "PDSCH-ServingCellConfig" for PDSCH and "PUSCH-ServingCellConfig" for PUSCH.
- the overhead coefficient N oh PRB may be a coefficient for considering overhead of a signal different from DMRS, and is defined as ⁇ 0, 6, 12, or 18 ⁇ in Rel.15/16 NR, for example.
- the overhead factor No oh PRB may be extended by adding a value for multi-slot transmission or by multiplying the factor.
- the number of slots N slot used for data transmission may be applied as a coefficient, and in this case N′ RE may be calculated according to the following equation (19).
- N'RE may be calculated according to the following equation (20).
- N DMRS PRB indicates the number of DMRS resource elements in a resource block per slot allocated for PDSCH or PUSCH transmission. Equation (20) allows the N DMRS PRB and No oh PRB defined in Rel. 15/16 NR to be applied even in multi-slot transmission, for example, so that processing in terminal 200 can be simplified. .
- N DMRS PRB indicates the number of DMRS resource elements per resource block in a slot section (N slot section) allocated for PDSCH or PUSCH transmission. Therefore, for example, even if the number of DMRS is set for each slot (for example, different for each slot), it is possible to represent the exact number of DMRS resource elements, and more accurately resource elements used for data transmission. number (ie, N' RE ) can be calculated.
- the total number of REs used for data transmission in each of a plurality of slots N′ RE is used to calculate the TB size. You can set the size.
- the total value N' RE of the number of REs in multiple slots is used to calculate the TB size. It is possible.
- the TB size is set extremely large depending on the value taken by N′ RE . can be suppressed.
- N RE may be calculated according to the following equation (21).
- N′ RE denotes the number of REs in one resource block per slot of multiple slots used for data (eg, PDSCH or PUSCH) transmission.
- N slot indicates the number of slots used for data (eg, PDSCH or PUSCH) transmission.
- Calculation method B may assume, for example, that the number of REs per resource block is the same in each of multiple slots used for data transmission.
- N′ RE has a slot with a smaller number of REs (eg, the smallest number).
- the number of REs in a particular slot such as the first slot (eg, also called the first slot) or the last slot, may be applied.
- a value based on the average number of REs in each of multiple slots may be applied to N′ RE .
- Calculation method B uses the number of REs in one slot to calculate the TB size, so compared to calculation method A, for example, it is possible to calculate the TB size more simply.
- N RE may be calculated according to the following equation (22) instead of equation (21).
- the calculation method of N REs is not limited to these.
- the upper limit of the number of REs in one slot may be different from 156.
- the upper limit of the number of resource elements is set to 156 in a specific slot (eg, the first slot), and the upper limit of the number of resource elements is set to 168 in other slots (eg, the second slot and later).
- the min operation in the N RE calculation formula may be replaced with min(156+12 ⁇ 14 ⁇ (N slot - 1), N' RE ).
- the upper limit of the number of resource elements can be appropriately set when overhead such as DMRS is mapped to the first symbol and not mapped to other symbols.
- the base station 100 and terminal 200 for example, set the TB size according to the number of slots used for data (eg, PDSCH or PUSCH) transmission.
- base station 100 and terminal 200 determine the TB size based on information related to the amount of resources (eg, number of slots) used for data (eg, transmission signals). For example, the greater the number of slots used for data transmission, the greater the number of information bits transmitted in each slot used for data transmission.
- the amount of data that can be transmitted in one HARQ process can be increased, so throughput can be improved even with a specified (for example, limited) number of HARQ processes.
- the TB size is set according to the number of slots used for data (eg, PDSCH or PUSCH) transmission. Therefore, for example, the number of information bits transmitted (for example, the amount of data) also increases as the number of slots increases. Throughput can be improved while suppressing degradation. This makes it possible to transmit data while suppressing a decrease in PSD, so that, for example, it is possible to expand the coverage area where a certain data rate can be achieved.
- data allocation can be notified to terminal 200 by one DCI for a plurality of slots, so control overhead can be reduced.
- consumption of HARQ processes in other words, increase in the number of HARQ processes used
- terminals can be simplified by reducing the number of HARQ processes.
- TBoMS transmission data transmission/reception processing such as encoding or modulation is performed for each slot individually.
- data transmission/reception processing such as encoding or modulation is performed for each slot individually.
- a specific slot (eg, the leading slot) may be mapped with a DMRS, and the remaining slots may not be mapped with a DMRS.
- This DMRS mapping allows base station 100 and terminal 200 to transmit more data. Therefore, even when DMRS mapping is individually set for each slot (for example, when different for each slot), the TB size can be set appropriately.
- the number of slots used for data (eg, PDSCH or PUSCH) transmission may be rephrased, for example, as "the number of slots that constitute a unit of TB processing".
- a plurality of slots used for data (eg, PDSCH or PUSCH) transmission may be temporally consecutive slots or non-consecutive slots.
- frequency resources eg, resource blocks
- frequency resources to which data is allocated in each of a plurality of slots may be individually configured (eg, different resources).
- the number of slots for TBoMS transmission may be set as the number of slots N slot .
- the number of slots N slot may correspond to the number of slots for TBoMS transmission.
- the TB size may be determined based on information about at least one of the number of slots for TBoMS transmission of data, a scaling factor, and the number of slots (e.g., number of time intervals) used to transmit data. .
- the calculated N info may be further multiplied by a scaling factor. For example, when N info is multiplied by a scaling factor smaller than 1, data transmission with lower MCS (or Spectral Efficiency) becomes possible and the coverage area can be expanded.
- the shorter the slot length the more the control information (for example, PDCCH) decoding trial frequency (or the number of times) is set once (or the number of times) for a plurality of slots instead of for each slot in order to reduce the amount of processing or power consumption of the terminal. Or it can be reduced to a frequency (or number of times) such as less than the number of slots).
- PDCCH Physical Downlink Control Channel
- the scaling factor may be notified (or configured) to terminal 200 by an RRC message “SPS-Config” for semi-persistent scheduling.
- the scaling factor may be notified (or configured) to terminal 200 by an RRC message “configuredGrantConfig” for Configured uplink grant.
- ACK/NACK is also called, for example, HARQ-ACK or HARQ-Feedback information.
- Repetition is also called, for example, slot aggregation, slot bundling, TTI aggregation, or TTI bundling.
- the number of repetitions in the above may be replaced with the number of slots N slot used for data transmission (PDSCH or PUSCH).
- the number of repetitions may correspond to the number of slots N slot .
- each embodiment described above describes transmission of uplink data (eg, PUSCH)
- an embodiment of the present disclosure is applied to both downlink data (eg, PDSCH) and uplink data. Alternatively, it may be applied to one and not applied to the other.
- a plurality of slots in TBoMS transmission are described as 0-th to n-th slots (n is an integer equal to or greater than 2) in the time direction.
- a slot in TBoMS transmission may be abbreviated as a TBoMS transmission slot.
- the TBoMS transmission slots before the nth slot may be, for example, the 0th to n-1th slots.
- ⁇ Option 1> For example, when PUCCH collides in the n-th slot of TBoMS transmission and it has already been determined that UCI is multiplexed in at least one of the TBoMS transmission slots before the n-th slot , the UCI is dropped without being multiplexed in the n-th slot.
- some UCIs may be low-priority UCIs.
- the low priority UCI may be CSI.
- UCI may include CSI part 2 or CSI part 1 and CSI part 2.
- two element candidates ⁇ , ⁇ ext ⁇ and ⁇ , ⁇ ext ⁇ may be set for the parameters ⁇ and ⁇ , respectively. Then, when it is determined that PUCCH collides in the n-th slot of TBoMS transmission and UCI is not multiplexed in TBoMS transmission slots before the n-th slot, ⁇ and ⁇ are used to determine the amount of UCI resources. may be calculated. On the other hand, when it is determined that PUCCH collides in the n-th slot of TBoMS transmission and UCI is multiplexed in TBoMS transmission slots before the n-th slot, ⁇ ext and ⁇ ext are used. , the UCI resource amount may be calculated.
- ⁇ and ⁇ may be parameters used for calculating the amount of UCI resources used in NR Rel.15/16.
- both the parameter ⁇ and the parameter ⁇ are set according to whether or not the UCI is multiplexed. and the other may be set regardless of whether the UCI is multiplexed or not.
- the number of candidate elements for the parameters ⁇ and ⁇ is not limited to two, and three or more candidate elements may be set. In this case, different elements may be used depending on the number of slots in which the UCI is multiplexed in the TBoMS transmission slots before the nth slot. For example, three element candidates ⁇ , ⁇ ext1 , ⁇ ext2 ⁇ and ⁇ , ⁇ ext1 , ⁇ ext2 ⁇ may be set for ⁇ and ⁇ , respectively.
- 9A and 9B are diagrams showing an example of the second embodiment.
- 9A and 9B show slots for TBoMS transmission (“TBoMS PUSCH” in FIGS. 9A and 9B) and slots for PUCCH. Note that the horizontal axes in FIGS. 9A and 9B represent time axes.
- the UCI is multiplexed in the 0th slot before the 2nd slot. Therefore, in the second slot, the method of dropping UCI without multiplexing (for example, option 1), or in the second slot, using ⁇ ext and ⁇ ext , the UCI of the UCI resource amount calculated (eg option 3) may be applied.
- FIG. 10 is a flowchart showing an operation example of terminal 200 according to the second embodiment.
- the flow shown in FIG. 10 is a flow showing operations for determining whether or not to multiplex UCI in the n-th slot (n-th slot), or calculating the resource amount of multiplexed UCI.
- the terminal 200 determines whether or not the transmission resources for PUCCH transmission and PUSCH transmission temporally overlap in the n-th slot (S61).
- terminal 200 transmits UCI using PUCCH of non-overlapping transmission resources (S62). Then, the flow of FIG. 10 ends.
- terminal 200 determines whether UCI is multiplexed in slots before the n-th slot (determined to be multiplexed). or not) is determined (S63).
- terminal 200 drops part or all of the UCI (applies Option 1 or Option 2), or ⁇ ext and ⁇ ext to calculate the UCI resource amount (apply Option 3) (S64). Then, the flow of FIG. 10 ends.
- terminal 200 multiplexes UCI (applies Option 1 or Option 2), or uses ⁇ and ⁇ to Calculate the UCI resource amount (apply Option 3) (S65). Then, the flow of FIG. 10 ends.
- the amount of UCI resources in a certain TBoMS transmission slot (for example, the second slot in FIGS. 9A and 9B) and the availability of UCI multiplexing are determined by the TBoMS transmission slot. It can be determined by considering the multiplexing situation of UCI in earlier TBoMS transmission slots (eg, 0th and 1st slots in FIGS. 9A and 9B). Therefore, in TBoMS transmission, it is possible to suppress deterioration of PUSCH transmission quality by increasing the number of slots in which UCI is multiplexed.
- the Option to be applied may be changed according to the number of slots used for TBoMS transmission. For example, if the number of slots used for TBoMS transmission is relatively small (e.g. 2 slots), Option 3 is applied, and if the number of slots used for TBoMS transmission is relatively large (e.g. 4 slots to 8 slots), Option 1 may apply.
- Option 1 when the degree of coverage expansion is high and the number of slots used for TBoMS transmission is large, and by not increasing the number of slots in which UCI is multiplexed, it is possible to prevent PUSCH transmission quality from deteriorating.
- the elements of parameter ⁇ and/or parameter ⁇ applied in Option 3 may be varied depending on the number of slots used for TBoMS transmission. For example, a case will be described in which two elements ⁇ , ⁇ ext ⁇ and ⁇ , ⁇ ext ⁇ are set for the parameter ⁇ or the parameter ⁇ . In this case, even if the number of slots used for TBoMS transmission is relatively small (for example, 2 slots) and it is determined that the UCI is multiplexed in the TBoMS transmission slots before the n-th slot, ⁇ and/or ⁇ may be used to calculate the UCI resource amount.
- ⁇ ext and/or ⁇ ext may be used to calculate the UCI resource amount.
- the degree of coverage extension is high and a large number of slots are required for TBoMS transmission, deterioration of PUSCH transmission quality can be prevented by using parameters that minimize UCI multiplexing.
- the elements of parameter ⁇ and/or parameter ⁇ applied in Option 3 may be changed.
- ⁇ and/or ⁇ for example, used in NR Rel. existing UCI resource amount calculation parameters
- the UCI resource amount may be calculated using ⁇ ext and/or ⁇ ext . .
- the number of slots in which UCI can be multiplexed may be defined by specifications (standards) or may be set by RRC or the like. If the number of slots in which UCI can be multiplexed is N (N is an integer equal to or greater than 1), and it is determined that UCI is multiplexed in N slots within the TBoMS transmission slots before the n-th slot , the UCI may be dropped without being multiplexed in the n-th slot.
- Embodiments 1 and 2 above have described cases in which UCI and uplink data are multiplexed on PUSCH when transmission resources for PUCCH and PUSCH overlap in terms of time in uplink transmission by terminal 200 .
- the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated by the second DCI after receiving the first DCI that allocates the PUSCH is transmitted and timed with the PUSCH allocated by the first DCI. There is a constraint that it is not allowed to allocate resources that overlap physically.
- Fig. 11 is a diagram explaining the restrictions of UCI (Uplink Control Information) on PUSCH in NR Rel.15/16. For example, as shown in the upper part of FIG. 11 , after the first DCI that allocates PUSCH to slot #3 is received in slot #0, and then the second DCI that allocates PDSCH is received in slot #1, Resources for transmitting ACK/NACK are not assigned to resources that temporally overlap with the transmission of PUSCH (slot #3).
- UCI Uplink Control Information
- the UE sends ACK/NACK for the PDSCH assigned by the second DCI after receiving the first DCI that assigns PUSCH to the PUSCH assigned by the first DCI. Multiple transmission is not supported.
- the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated by the second DCI after receiving the first DCI that allocates PUSCH is the first DCI, for example, as shown in the lower part of FIG. resource (eg, slot #4) that does not temporally overlap with the PUSCH transmission (eg, slot #3) allocated by .
- PUSCH transmission slots may occupy uplink slots.
- the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated by the second DCI after receiving the first DCI that allocates the PUSCH is used as the transmission of the PUSCH allocated by the first DCI. 12, terminal 200 does not transmit ACK/NACK for PDSCH until TBoMS transmission is completed. ACK/NACK, the downlink delay over which the data transmission is controlled may increase.
- control information included in DCI that allocates PDSCH can include, for example, information (K1 or PDSCH-to-HARQ_feedback timing indication) regarding the timing of transmitting PUCCH after how many slots from the slot in which PDSCH was received.
- K1 or PDSCH-to-HARQ_feedback timing indication regarding the timing of transmitting PUCCH after how many slots from the slot in which PDSCH was received.
- the range of K1 values that can be reported is limited. Therefore, if there are restrictions such as those described above, blocking of PDSCH allocation occurs due to disallowance of PUCCH allocation, and downlink frequency utilization efficiency may decrease.
- the above-mentioned "PUCCH for transmitting ACK / NACK for PDSCH allocated by the second DCI after receiving the first DCI that allocates PUSCH It is desirable to remove the restriction that resources are not allowed to be allocated to resources that overlap in time with the PUSCH transmission allocated by the first DCI.
- the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated by the second DCI after receiving the first DCI that allocates the PUSCH overlaps temporally with the transmission of the PUSCH allocated by the first DCI. Allows allocation to resources.
- PUSCH coverage performance may be degraded because part of the PUSCH resource is punctured to transmit ACK/NACK for the PDSCH allocated by the second DCI.
- the terminal 200 when the terminal 200 performs TBoMS transmission of PUSCH, a method of improving frequency utilization efficiency of downlink transmission, reducing delay, and reducing degradation of PUSCH coverage performance is shown. .
- the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated by the second DCI after receiving the first DCI that allocates the PUSCH overlaps temporally with the transmission of the PUSCH allocated by the first DCI. Allows allocation to resources. Then, for example, whether the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated by the second DCI after receiving the first DCI temporally overlaps with the transmission of the PUSCH allocated by the first DCI At least one of the ACK/NACK transmission method, the number of ACK/NACK transmission bits, and the PUSCH repetition transmission resource is controlled depending on whether or not.
- the PUCCH resource for transmitting ACK/NACK for PDSCH allocated by the second DCI after receiving the first DCI that allocates PUSCH is It is allowed to allocate resources that temporally overlap with the PUSCH transmission allocated by the first DCI.
- ACK/NACK for the PDSCH allocated by the second DCI is transmitted by puncturing part of the PUSCH resource allocated by the first DCI.
- the number of bits of ACK/NACK for the PDSCH allocated by the second DCI that can be transmitted by puncturing part of the PUSCH resource allocated by the first DCI is limited to X bits. If the number of ACK/NACK bits for the PDSCH allocated by the second DCI exceeds X bits, ACK/NACK bundling (ACK/NACK bit compression) is applied to reduce the actual number of ACK/NACK bits to be transmitted. After reducing it to X bits or less, a part of the PUSCH resource allocated by the first DCI is punctured and transmitted.
- the value of X may be determined based on the number of slots used for PUSCH transmission, or may be determined from parameters set in other terminals.
- FIG. 13 is a flow chart showing an operation example of method 1 of the third embodiment. As shown in FIG. 13 , for example, after receiving the first DCI for allocating PUSCH from the base station 100 (after S101), the terminal 200 determines whether TBoMS transmission is applied (S102).
- terminal 200 receives the first DCI that allocates PUSCH, and then uses the second DCI to allocate PUCCH resources for transmitting ACK/NACK for PDSCH. is not allowed to be assigned to resources that temporally overlap with the PUSCH transmission assigned by the first DCI (S108). For example, terminal 200 may transmit PUCCH on resources that do not temporally overlap with transmission of PUSCH by operations equivalent to operations supported in NR Rel.15/16.
- the terminal 200 When TBoMS transmission is applied (S102; Yes), the terminal 200, for example, receives the first DCI that allocates PUSCH, and uses the second DCI to transmit ACK/NACK for the PDSCH allocated by the PUCCH resource. are allowed to be allocated to resources that temporally overlap with the PUSCH transmission allocated by the first DCI (S103).
- the PUCCH allocated by the second DCI and the PUSCH transmission resource allocated by the first DCI are temporally It is determined whether or not they overlap (S105).
- terminal 200 punctures part of the PUSCH resources allocated by the first DCI, and allocates the punctured resources by the second DCI, for example.
- ACK/NACK for the received PDSCH may be transmitted (S106).
- terminal 200 uses (or reassigns) part of the PUSCH resources allocated by the first DCI as PUCCH resources, and ACKs the PDSCH allocated by the second DCI. /NACK may be sent.
- puncturing may be performed, for example, by avoiding resources to which reference signals (for example, demodulation reference signals (DMRS)) are mapped in PUSCH.
- DMRS demodulation reference signals
- the number of bits of ACK/NACK (for the PDSCH allocated by the second DCI) that can be transmitted by puncturing a part of the PUSCH resource allocated by the first DCI is, for example, a threshold (for example, X bits ) may be limited to:
- terminal 200 applies ACK/NACK bundling (eg, compression of ACK/NACK bits). By doing so, the number of ACK/NACK bits actually transmitted may be suppressed to X (bits) or less.
- terminal 200 may puncture part of the PUSCH resources allocated by the first DCI according to the number of ACK/NACK bits, which is X bits or less, and transmit ACK/NACK.
- X is a positive integer value greater than zero.
- the value of X may be determined, for example, based on the required PUSCH coverage performance.
- a non-limiting example of implicitly determining the value of X may be determining the value of X based on the number of repetitions of PUSCH, or other information or parameters set in terminal 200. may be determined based on
- the terminal 200 uses the second DCI.
- ACK/NACK for the PDSCH assigned by the second DCI may be transmitted on the PUCCH assigned by the second DCI (S107).
- FIG. 14 is a diagram showing an operation example of Method 1. As illustrated in FIG. 14, the first DCI in slot #0 allocates slot #3 as the timing for transmitting PUSCH. Terminal 200 performs TBoMS transmission in slots #3, #4, #7, and #8.
- a “slot” is an example of a unit of time resource, and may be a unit of other names.
- the PDSCH is allocated by the second DCI in slot #1, and the PUCCH resource for transmitting ACK/NACK for the PDSCH is allocated to slot #3.
- ACK/NACK for the PDSCH allocated by the second DCI is transmitted by puncturing part of the PUSCH resource.
- the number of ACK/NACK bits to be transmitted is X bits or less.
- ACK/NACK for PDSCH allocated by the second DCI after receiving the first DCI that allocates PUSCH is transmitted.
- PUCCH resources are allowed to be allocated to resources that overlap in time with the PUSCH transmission allocated by the first DCI. Therefore, it is possible to improve the frequency utilization efficiency of downlink transmission and reduce the delay.
- FIG. 15 is a flowchart showing an operation example of terminal 200 to which method 2 is applied.
- the processes of S101 to S105, S107 and S108 excluding S106a may be the same as the processes illustrated in FIG.
- method 2 as in method 1, when TBoMS transmission is applied to terminal 200, ACK/NACK for PDSCH allocated by the second DCI after receiving the first DCI that allocates PUSCH is performed. It is allowed to allocate PUCCH resources for transmission to resources that temporally overlap with the transmission of PUSCH allocated by the first DCI.
- ACK/NACK for PDSCH allocated by the second DCI has a higher priority than PUSCH allocated by the first DCI. send and treat. For example, slots in which PUCCH and PUSCH transmission resources temporally overlap may be set as unavailable slots for PUSCH transmission.
- terminal 200 transmits ACK/NACK on PUCCH resources allocated by the second DCI, and postpones TBoMS transmission of PUSCH allocated by the first DCI, for example, backward in time. ) (S106a).
- FIG. 16 is a diagram showing an operation example of Method 2.
- the first DCI in slot #0 allocates slot #3 as the timing for transmitting PUSCH.
- a PDSCH is allocated by the second DCI in slot #1, and a PUCCH resource for transmitting ACK/NACK for the PDSCH is allocated to slot #3.
- ACK/NACK is treated as a higher priority transmission than PUSCH, and slot #3 is an unavailable slot for PUSCH transmission (unavailable slot). Therefore, in slot #3, terminal 200 transmits ACK/NACK, which has a higher priority than PUSCH, using PUCCH resources.
- terminal 200 transmits PUSCH in slots #4, #7, #8, and #9, which are uplink slots that can be used for TBoMS transmission.
- ACK/NACK for PDSCH allocated by the second DCI after receiving the first DCI that allocates PUSCH is transmitted.
- PUCCH resources are allowed to be allocated to resources that overlap in time with the PUSCH transmission allocated by the first DCI. Therefore, it is possible to improve the frequency utilization efficiency of downlink transmission and reduce the delay.
- a slot in which PUCCH and PUSCH transmission resources temporally overlap is set as an unavailable slot for PUSCH transmission.
- terminal 200 can perform PUSCH transmission (TBoMS transmission) without being affected by puncturing of PUSCH resources due to ACK/NACK, and thus can avoid or suppress degradation of PUSCH coverage performance.
- FIG. 17 is a flowchart showing an operation example of terminal 200 to which method 3 is applied.
- the processes of S101 to S105, S107 and S108 excluding S106b may be the same as the processes illustrated in FIG.
- method 3 as in methods 1 and 2, when TBoMS transmission is applied to terminal 200, ACK/ It is allowed to allocate PUCCH resources for transmitting NACKs to resources that temporally overlap with the transmission of PUSCH allocated by the first DCI.
- the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated by the second DCI temporally overlaps with the transmission of the PUSCH allocated by the first DCI, allocation by the second DCI
- the HARQ process of the received PDSCH may be set to Disable (S106b).
- the terminal 200 transmits the second DCI. Do not send ACK/NACK for the PDSCH assigned by
- FIG. 18 is a diagram showing an operation example of Method 3.
- the first DCI in slot #0 allocates slot #3 as the timing for transmitting PUSCH.
- Terminal 200 performs TBoMS transmission in slots #3, #4, #7, and #8.
- a PDSCH is allocated by the second DCI in slot #1, and a PUCCH resource for transmitting ACK/NACK for the PDSCH is allocated to slot #3.
- the HARQ process for the PDSCH assigned by the second DCI in slot #1 is disabled, and terminal 200 does not transmit ACK/NACK in slot #3.
- method 3 similarly to methods 1 and 2, when the terminal 200 performs TBoMS transmission, PDSCH assigned by the second DCI after receiving the first DCI that assigns PUSCH It is allowed to allocate PUCCH resources for transmitting ACK/NACKs to resources that temporally overlap with the transmission of PUSCH allocated by the first DCI. Therefore, it is possible to improve the frequency utilization efficiency of downlink transmission and reduce the delay.
- terminal 200 can perform PUSCH transmission (TBoMS transmission) without being affected by PUSCH resource puncturing due to ACK/NACK. Therefore, deterioration of PUSCH coverage performance can be avoided or suppressed.
- PDSCH allocation (in other words, scheduling) can be performed without waiting for reception of HARQ-ACK feedback from the terminal 200, so the degree of freedom in scheduling can be improved.
- the PDSCH reliability is set appropriately, for example, PDSCH that disables the HARQ process increases the reliability of the initial transmission and transmits it (for example, by adjusting the Modulation and Coding Scheme, MCS and the amount of allocated resources). Degradation of retransmission efficiency can be reduced by applying the processing to
- the number of bits according to the resource amount of the number of slots (integer of 2 or more) used for PUSCH transmission from a predetermined RV position Read and map to PUSCH resources spanning multiple slots.
- the PUSCH coverage may be improved by using a TBoMS transmission unit consisting of a plurality of slots as one TBoMS transmission unit and repeating transmission of one TBoMS transmission unit (repetition).
- one resource (slot) for TBoMS transmission may be regarded as one TBoMS transmission unit.
- each slot of four TBoMS transmissions may be considered one TBoMS transmission unit.
- Embodiment 3 is changed. may apply.
- different embodiments may be applied depending on which slot in TBoMS transmission the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated in the first DCI collides with.
- the first embodiment may be applied in the case of collision with the leading slot of TBoMS
- the second embodiment may be applied in the case of collision with slots other than the leading slot of TBoMS.
- the third embodiment may be applied, and when the collision occurs with a slot other than the leading slot of the TBoMS, the second embodiment may be applied.
- the method to apply depends on whether it has already been determined that the UCI is multiplexed in TBoMS transmission slots before the nth slot can be different. For example, when PUCCH collides in the n-th slot of TBoMS transmission, if UCI has already been multiplexed in TBoMS transmission slots before the n-th slot, method 2 or If Method 3 is applied and UCI is not multiplexed in TBoMS transmission slots before the n-th slot, Method 1 may be applied.
- the amount of UCI multiplexing resources in TBoMS transmission or whether UCI multiplexing is possible can be determined in consideration of the situation of UCI multiplexing in forward slots, deterioration of PUSCH transmission quality due to an increase in the number of UCI multiplexing slots can be suppressed in TBoMS transmission. be able to.
- Modification 1 of Embodiment 3 when TBoMS transmission is applied to terminal 200, ACK/NACK for PDSCH allocated by the second DCI after receiving the first DCI that allocates PUSCH. are allocated to resources that overlap in time with the PUSCH transmissions allocated by the first DCI.
- the second DCI ACK skipping may be applied to HARQ processes on the assigned PDSCH.
- terminal 200 When ACK skipping is applied to the HARQ process, terminal 200 does not transmit ACK/NACK for PDSCH if the decoding result for PDSCH is ACK. Since the probability that the PDSCH decoding result is ACK tends to be higher than the probability that it is NACK, skipping ACK transmission can reduce the overhead of PUCCH and reduce the processing load of terminal 200, for example.
- This modification may be understood to be the same as applying Method 3 when the decoding result for the PDSCH assigned by the second DCI is ACK.
- Method 1 or method 2 may be applied.
- Modification 2 In methods 1, 2, and 3 described above, when TBoMS transmission of PUSCH is applied to terminal 200, ACK/ It is allowed to allocate PUCCH resources for transmitting NACK to resources that temporally overlap with the transmission of PUSCH allocated by the first DCI.
- the slots in which PUCCH and PUSCH transmission resources temporally overlap may be any slot among the TBoMS transmissions allocated by the first DCI.
- the slot in which PUCCH and PUSCH transmission resources temporally overlap may be the head slot of TBoMS transmission as illustrated in FIGS. good too.
- methods 1, 2, and 3 are applied according to which slot in TBoMS transmission the PUCCH resource for transmitting ACK/NACK for the PDSCH allocated by the first DCI overlaps (or collides with). can be different.
- Method 1 when the PUCCH resource for transmitting ACK/NACK collides with the first slot (MS#0) of TBoMS transmission as shown in FIG. 19, Method 1 may be applied, as shown in FIG. Method 2 may be applied in the case of collision with a slot (for example, MS#1) different from the leading slot of TBoMS transmission.
- a slot for example, MS#1
- Method 3 if the PUCCH resource for transmitting ACK/NACK collides with the leading slot of TBoMS transmission, Method 3 is applied, and the PUCCH resource for transmitting ACK/NACK is different from the leading slot of TBoMS transmission. Method 2 may be applied if there is a collision with a different slot.
- priority can be set for uplink transmission such as PUSCH or ACK/NACK.
- the number of priority levels is 2, uplink transmission with priority index 0 is low priority, and uplink transmission with priority index 1 is high priority. be.
- the method to be applied among methods 1, 2, and 3 may be changed depending on the priority of ACK/NACK or the priority of PUSCH, or both.
- FIG. 21 is a diagram showing an example of case classification based on ACK/NACK priority and PUSCH priority. For example, Case 1 or Case 4 (ACK/NACK and PUSCH have the same priority), Method 1, Case 2 (PUSCH has higher priority than ACK/NACK), Method 3, Case 3 ( If ACK/NACK has higher priority than PUSCH, Method 2 may be applied.
- Method 2 or 3 may be applied to Case 1 or Case 4.
- Method 2 when ACK/NACK has a high priority, Method 2 can be applied to transmit ACK/NACK with priority, and PUSCH can be postponed to compensate for PUSCH coverage. Also, if the PUSCH has a high priority, method 3 can be applied to transmit the PUSCH on the resources allocated by the DCI, thereby compensating for coverage and delay. In this way, appropriate uplink transmission can be realized based on the priority of ACK/NACK or PUSCH.
- Modification 4 When PUCCHs collide in the n-th slot of TBoMS transmission, different methods may be applied depending on whether UCI is already multiplexed in TBoMS transmission slots before the n-th slot. good. For example, if PUCCH collides in the n-th slot of TBoMS transmission and it is already determined that UCI is multiplexed in TBoMS transmission slots before the n-th slot, in the n-th slot, Method 2 or Method 3 may be applied. For example, if it is determined that PUCCH collides in the nth slot of TBoMS transmission and UCI is not multiplexed in TBoMS transmission slots before the nth slot, Method 1 may be applied.
- the amount of UCI multiplexing resources in TBoMS transmission or whether UCI multiplexing is possible can be determined in consideration of the situation of UCI multiplexing in slots preceding the slot in which PUCCH and PUSCH collide, in TBoMS transmission, slots for UCI multiplexing can be determined. It is possible to suppress deterioration of PUSCH transmission quality due to the increase.
- the above-described method or modification may be applied. Also, the method to be applied may be changed according to the number of repetitions of PUSCH.
- the method to be applied or the modified example may differ depending on the number of ACK/NACK bits. Also, for example, depending on whether the number of ACK/NACK bits is less than or equal to a threshold (for example, X bits as described above), or whether or not the number of ACK/NACK bits can be compressed to less than or equal to the threshold, the method or modification to be applied Different examples may be used.
- a threshold for example, X bits as described above
- the number of ACK/NACK bits may be, for example, the number of ACK/NACK bits for the PDSCH allocated by the second DCI, or the ACK/NACK for the PDSCH allocated by the second DCI and the first DCI. It may be the total number of bits including ACK/NACK for PDSCH allocated by DCI before reception.
- the latter example is useful in cases where ACK/NACKs for PDSCHs allocated by a plurality of DCIs are multiplexed into UCI and transmitted on PUCCH. can be avoided or suppressed.
- the number of ACK/NACK bits may be the number of bits before ACK/NACK bundling or the number of bits after ACK/NACK bundling.
- the slots in which PUCCH and PUSCH transmission resources temporally overlap may be any slot among the TBoMS transmissions allocated by the first DCI.
- the slot in which PUCCH and PUSCH transmission resources temporally overlap may be the head slot of TBoMS transmission, or may be a slot different from the head slot.
- any of Embodiments 1, 2 and 3 can be applied. Different embodiments may be used.
- Embodiment 1 when the PUCCH resource for transmitting ACK/NACK collides with the leading slot, Embodiment 1 may be applied. Form 2 may be applied.
- Embodiment 3 when the PUCCH resource for transmitting ACK/NACK collides with the leading slot of TBoMS transmission, Embodiment 3 is applied, and the PUCCH resource for transmitting ACK/NACK collides with the leading slot of TBoMS transmission.
- Embodiment 2 may be applied in the case of collision with a different slot.
- Determination of available uplink slots for PUSCH transmission may depend on RRC signaling.
- RRC signaling may include TDD uplink/downlink slot format indication (eg, semi-static slot format indicator (SFI)) and the like.
- SFI semi-static slot format indicator
- Determination of available uplink slots for PUSCH transmission may depend, for example, on RRC signaling and signaling by DCI to allocate resources for TBoMS transmission.
- the RRC signaling may include TDD uplink/downlink slot format notification (eg, semi-static SFI).
- DCI that allocates resources for TBoMS transmission may directly (or explicitly) signal unavailable slots for PUSCH transmission, or invalid uplink slots/symbols signaled by RRC signaling. You may specify whether (invalid UL slot/symbol) is invalid or valid.
- the determination of available uplink slots for PUSCH transmission may depend on eg RRC signaling, DCI to allocate resources for TBoMS transmission and dynamic SFI signaling.
- the RRC signaling may include TDD uplink/downlink slot format notification (eg, semi-static SFI).
- DCI that allocates resources for TBoMS transmission may directly (or explicitly) signal unavailable slots for PUSCH transmission, or invalid uplink slots/symbols signaled by RRC signaling. You may specify whether (invalid UL slot/symbol) is invalid or valid.
- the dynamic SFI may include, for example, TDD uplink/downlink slot format notification (dynamic SFI) notified by the Group-common PDCCH.
- the relationship between the method of determining uplink slots that can be used for PUSCH transmission and each method in Embodiment 3 is, for example, as follows.
- Method 1 may be applied to any of determination method 1, determination method 2, and determination method 3.
- Method 2 is preferably applied in conjunction with determination method 3. The reason is that, for example, a second DCI after receiving a first DCI that allocates PUSCH can be processed as a notification similar to Dynamic SFI of determination method 3. However, Method 2 may be applied to other determination methods.
- Method 3 may be applied to any of determination method 1, determination method 2, and determination method 3.
- the above-described embodiment or modification may be applied only to specific TBoMS transmission. Also, the embodiment or the modified example to be applied may be varied depending on the TBoMS transmission method.
- the PUCCH transmission unit is not limited to a slot.
- the PUCCH transmission unit may be the subslot unit introduced in NR Rel.16.
- the number of symbols included in a subslot is smaller than that of a slot. For example, if the number of symbols included in a slot is 14 (or 12), the number of symbols included in a subslot may be 2 or 7 (or 6).
- application of the embodiment or modification may be controlled (for example, enabled or disabled) depending on whether the PUCCH transmission unit is a slot or a sub-slot. Also, different embodiments or modifications may be applied depending on whether the unit of PUCCH transmission is a slot or a sub-slot.
- terminal 200 may receive a plurality of DCIs that allocate PUCCHs to resources that temporally overlap with transmission of PUSCHs allocated by the first DCI.
- the last DCI received by the terminal 200 among the multiple DCIs may be replaced (or read) with the second DCI, and the above embodiment or modification may be applied.
- PUCCH that transmits ACK/NACK has been described as an example of transmission in a single slot, but PUCCH may be transmitted using multiple slots. For example, repetition may be applied to PUCCH as well.
- terminal 200 punctures part of the PUSCH resource and transmits ACK/NACK as in Embodiment 1. good.
- terminal 200 may transmit ACK/NACK using PUCCH in slots in which PUCCH resources and PUSCH resources do not collide (for example, slot #9 shown in FIG. 19).
- the number of ACK/NACK bits to be transmitted may be the same between TBoMS transmission slots, or may be different between TBoMS transmission slots.
- the former regardless of whether or not the PUCCH resource and the PUSCH resource collide, apply the X-bit limit of Method 1 of Embodiment 3 (or apply ACK/NACK bundling ) is mentioned.
- X-bit restrictions are applied (or ACK/NACK bundling is applied) in the same manner as in Method 1 of Embodiment 3, and PUCCH For example, X-bit restrictions are not applied (or ACK/NACK bundling is not applied) in slots where resource and PUSCH resource do not collide.
- terminal 200 transmits ACK/NACK for PDSCH in an uplink slot after TBoMS transmission is completed.
- the control information included in the DCI that allocates PDSCH can include timing information (K1 or PDSCH-to-HARQ_feedback timing indication) indicating how many slots after the slot in which PDSCH is received to transmit PUCCH.
- timing range regarding the timing that can be notified (or instructed) to the terminal 200 by the control information
- the timing that can be notified is limited. Expanding the range is considered.
- TBoMS transmission of PUSCH is applied to terminal 200, and the PUCCH resource for transmitting ACK/NACK for PDSCH allocated in the second DCI after receiving the first DCI that allocates PUSCH is selected as the second DCI. If it is not allowed to assign resources that overlap in time with PUSCH transmissions assigned with a DCI of 1, the determination (eg, calculation) of K1 may not include slots for TBoMS transmissions.
- FIG. 24 shows an example in which the PDSCH is allocated by the second DCI in slot #1, and the PUCCH resource for transmitting ACK/NACK for the PDSCH is allocated to slot #9.
- the K1 determination method described above may be applied depending on the TBoMS transmission method, or applied depending on whether the unit of PUCCH transmission is a slot or a sub-slot, or depending on the priority of ACK/NACK. may be Also, the K1 determination method described above may be applied in combination with the above-described embodiment or modification.
- the capability information includes an information element (IE) that individually indicates whether or not the terminal 200 supports at least one of the functions, operations, or processes shown in each of the above-described embodiments, modifications, and supplements. may contain.
- the capability information includes an information element indicating whether or not the terminal 200 supports a combination of two or more of the functions, operations, or processes shown in each of the above-described embodiments, modifications, and supplements. may contain.
- base station 100 may determine (or determine or assume) functions, operations, or processes supported (or not supported) by terminal 200 as the source of capability information. The base station 100 may perform operation, processing, or control according to the determination result based on the capability information. For example, based on the capability information received from terminal 200, base station 100 assigns at least one of downlink resources such as PDCCH or PDSCH and uplink resources such as PUCCH or PUSCH (in other words, scheduling ) may be controlled.
- downlink resources such as PDCCH or PDSCH
- uplink resources such as PUCCH or PUSCH (in other words, scheduling ) may be controlled.
- the terminal 200 does not support some of the functions, operations, or processes shown in each of the above-described embodiments, modifications, and supplements, and the terminal 200 does not support such functions, operations, or Alternatively, it may be read that the processing is restricted. For example, base station 100 may be notified of information or requests regarding such restrictions.
- Information about the capabilities or limitations of terminal 200 may be defined, for example, in a standard, or may be implicitly associated with information known in base station 100 or information transmitted to base station 100 . may be notified.
- ACK/NACK may be called HARQ-ACK or HARQ-Feedback information, for example.
- Repetition may also be called slot aggregation, slot bundling, TTI aggregation, or TTI bundling, for example.
- the present disclosure may be applied to communication between terminals such as sidelink communication, for example.
- the downlink control channel, downlink data channel, uplink control channel, and uplink data channel are not limited to PDCCH, PDSCH, PUCCH, and PUSCH, respectively, and control channels with other names. It's okay.
- RRC signaling is assumed for higher layer signaling, but it may be replaced with Medium Access Control (MAC) signaling and DCI notification, which is physical layer signaling.
- MAC Medium Access Control
- the downlink control signal (information) related to the present disclosure may be a signal (information) transmitted by PDCCH of the physical layer, a signal (information) transmitted by MAC CE (Control Element) or RRC of the higher layer ) can be used. Also, the downlink control signal may be a signal (information) defined in advance.
- the uplink control signal (information) related to the present disclosure may be a signal (information) transmitted by PUCCH of the physical layer, or may be a signal (information) transmitted by MAC CE or RRC of the higher layer. Also, the uplink control signal may be a signal (information) defined in advance. Also, the uplink control signal may be replaced with UCI (uplink control information), 1st stage SCI (sidelink control information), and 2nd stage SCI.
- the base station includes TRP (Transmission Reception Point), cluster head, access point, RRH (Remote Radio Head), eNodeB (eNB), gNodeB (gNB), BS (Base Station), BTS (Base Transceiver Station) , parent device, gateway, or the like.
- TRP Transmission Reception Point
- eNB eNodeB
- gNodeB gNB
- BTS Base Transceiver Station
- parent device gateway, or the like.
- one terminal may perform an operation corresponding to a base station.
- a base station may be a relay device that relays communication between an upper node and a terminal.
- the base station may be a roadside device.
- the present disclosure may be applied to any of uplink, downlink, and sidelink.
- the present disclosure to uplink PUSCH, PUCCH, PRACH, downlink PDSCH, PDCCH, PBCH, sidelink PSSCH (Physical Sidelink Shared Channel), PSCCH (Physical Sidelink Control Channel), PSBCH (Physical Sidelink Broadcast Channel) may apply.
- PDCCH, PDSCH, PUSCH, and PUCCH are examples of downlink control channels, downlink data channels, uplink data channels, and uplink control channels.
- PSCCH and PSSCH are examples of sidelink control channels and sidelink data channels.
- PBCH and PSBCH are broadcast channels, and PRACH is an example of a random access channel.
- the present disclosure may apply to both data channels and control channels.
- the channels of the present disclosure may be replaced with data channels PDSCH, PUSCH, and PSSCH, and control channels PDCCH, PUCCH, PBCH, PSCCH, and PSBCH.
- the reference signal is a signal known to both the base station and the terminal, and is also called RS (Reference Signal) or pilot signal.
- Reference signals are DMRS, CSI-RS (Channel State Information - Reference Signal), TRS (Tracking Reference Signal), PTRS (Phase Tracking Reference Signal), CRS (Cell-specific Reference Signal), SRS (Sounding Reference Signal). or
- the unit of time resources is not limited to one or a combination of slots and symbols, for example, frames, superframes, subframes, slots, time slots, subslots, minislots or symbols, OFDM Division Multiplexing) symbols, SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbols, or other time resource units.
- the number of symbols included in one slot is not limited to the number of symbols exemplified in the above embodiment, and may be another number of symbols.
- the present disclosure may be applied to both licensed bands and unlicensed bands.
- the present disclosure may be applied to any of communication between base stations and terminals (Uu link communication), communication between terminals (Sidelink communication), and V2X (Vehicle to Everything) communication.
- the channels of the present disclosure may be replaced with PSCCH, PSSCH, PSFCH (Physical Sidelink Feedback Channel), PSBCH, PDCCH, PUCCH, PDSCH, PUSCH, and PBCH.
- the present disclosure may be applied to both terrestrial networks and non-terrestrial networks (NTN: Non-Terrestrial Network) using satellites and advanced pseudolites (HAPS).
- NTN Non-Terrestrial Network
- HAPS advanced pseudolites
- the present disclosure may also be applied to terrestrial networks with large transmission delays compared to symbol lengths and slot lengths, such as networks with large cell sizes and ultra-wideband transmission networks.
- An antenna port refers to a logical antenna (antenna group) composed of one or more physical antennas.
- the antenna port does not always refer to one physical antenna, but may refer to an array antenna or the like composed of a plurality of antennas.
- how many physical antennas constitute an antenna port is not specified, but is specified as the minimum unit in which a terminal can transmit a reference signal.
- an antenna port may be defined as the minimum unit for multiplying weights of precoding vectors.
- 5G fifth generation cellular technology
- NR new radio access technologies
- the system architecture as a whole is assumed to be NG-RAN (Next Generation-Radio Access Network) with gNB.
- the gNB provides UE-side termination of NG radio access user plane (SDAP/PDCP/RLC/MAC/PHY) and control plane (RRC) protocols.
- SDAP/PDCP/RLC/MAC/PHY NG radio access user plane
- RRC control plane
- the gNB also connects to the Next Generation Core (NGC) via the Next Generation (NG) interface, and more specifically, the Access and Mobility Management Function (AMF) via the NG-C interface (e.g., a specific core entity that performs AMF) , and is also connected to a UPF (User Plane Function) (eg, a specific core entity that performs UPF) by an NG-U interface.
- NNC Next Generation Core
- AMF Access and Mobility Management Function
- UPF User Plane Function
- the NG-RAN architecture is shown in Figure 25 (see, eg, 3GPP TS 38.300 v15.6.0, section 4).
- the NR user plane protocol stack (e.g., 3GPP TS 38.300, see section 4.4.1) consists of a network-side terminated PDCP (Packet Data Convergence Protocol (see TS 38.300, section 6.4)) sublayer at the gNB, It includes the RLC (Radio Link Control (see TS 38.300 clause 6.3)) sublayer and the MAC (Medium Access Control (see TS 38.300 clause 6.2)) sublayer. Also, a new Access Stratum (AS) sublayer (Service Data Adaptation Protocol (SDAP)) has been introduced on top of PDCP (see, for example, 3GPP TS 38.300, Section 6.5).
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- SDAP Service Data Adaptation Protocol
- a control plane protocol stack is defined for NR (see, eg, TS 38.300, section 4.4.2).
- An overview of layer 2 functions is given in clause 6 of TS 38.300.
- the functions of the PDCP sublayer, RLC sublayer and MAC sublayer are listed in TS 38.300 clauses 6.4, 6.3 and 6.2 respectively.
- the functions of the RRC layer are listed in clause 7 of TS 38.300.
- the Medium-Access-Control layer handles logical channel multiplexing and scheduling and scheduling-related functions, including handling various neurology.
- the physical layer is responsible for encoding, PHY HARQ processing, modulation, multi-antenna processing, and mapping of signals to appropriate physical time-frequency resources.
- the physical layer also handles the mapping of transport channels to physical channels.
- the physical layer provides services to the MAC layer in the form of transport channels.
- a physical channel corresponds to a set of time-frequency resources used for transmission of a particular transport channel, and each transport channel is mapped to a corresponding physical channel.
- physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel) as uplink physical channels, and PDSCH (Physical Downlink Shared Channel) as downlink physical channels.
- PDCCH Physical Downlink Control Channel
- PBCH Physical Broadcast Channel
- NR use cases/deployment scenarios include enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), massive machine type communications (mMTC) with diverse requirements in terms of data rate, latency and coverage can be included.
- eMBB is expected to support peak data rates (20 Gbps in the downlink and 10 Gbps in the uplink) and user-experienced data rates on the order of three times the data rates provided by IMT-Advanced.
- URLLC more stringent requirements are imposed for ultra-low latency (0.5 ms each for UL and DL for user plane latency) and high reliability (1-10-5 within 1 ms).
- mMTC preferably has high connection density (1,000,000 devices/km2 in urban environments), wide coverage in hostile environments, and extremely long battery life (15 years) for low cost devices. can be sought.
- the OFDM numerology (e.g., subcarrier spacing, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval) suitable for one use case may be used for other use cases. May not be valid.
- low-latency services preferably require shorter symbol lengths (and thus larger subcarrier spacings) and/or fewer symbols per scheduling interval (also called TTI) than mMTC services.
- TTI time-to-live
- Subcarrier spacing may optionally be optimized to maintain similar CP overhead.
- the value of subcarrier spacing supported by NR may be one or more.
- resource element may be used to mean the smallest resource unit consisting of one subcarrier for the length of one OFDM/SC-FDMA symbol.
- resource grids of subcarriers and OFDM symbols are defined for uplink and downlink, respectively.
- Each element of the resource grid is called a resource element and is identified based on a frequency index in the frequency domain and a symbol position in the time domain (see 3GPP TS 38.211 v15.6.0).
- FIG. 26 shows functional separation between NG-RAN and 5GC.
- Logical nodes in NG-RAN are gNBs or ng-eNBs.
- 5GC has logical nodes AMF, UPF and SMF.
- gNBs and ng-eNBs host the following main functions: - Radio Bearer Control, Radio Admission Control, Connection Mobility Control, dynamic allocation of resources to UEs in both uplink and downlink (scheduling), etc. Functions of Radio Resource Management; - IP header compression, encryption and integrity protection of data; - AMF selection at UE attach when routing to an AMF cannot be determined from information provided by the UE; - routing of user plane data towards UPF; - routing of control plane information towards AMF; - setting up and tearing down connections; - scheduling and sending paging messages; - scheduling and transmission of system broadcast information (originating from AMF or Operation, Admission, Maintenance (OAM)); - configuration of measurements and measurement reports for mobility and scheduling; - transport level packet marking in the uplink; - session management; - support for network slicing; - QoS flow management and mapping to data radio bearers; - Support for UEs in RRC_INACTIVE state; - the ability to deliver NAS messages; - sharing
- the Access and Mobility Management Function hosts the following main functions: - Ability to terminate Non-Access Stratum (NAS) signaling; - security of NAS signaling; - Access Stratum (AS) security controls; - Core Network (CN) inter-node signaling for mobility across 3GPP access networks; - Reachability to UEs in idle mode (including control and execution of paging retransmissions); - management of the registration area; - support for intra-system and inter-system mobility; - access authentication; - access authorization, including checking roaming rights; - mobility management control (subscription and policy); - support for network slicing; - Selection of the Session Management Function (SMF).
- NAS Non-Access Stratum
- AS Access Stratum
- CN Core Network
- the User Plane Function hosts the following main functions: - Anchor points for intra-RAT mobility/inter-RAT mobility (if applicable); - External PDU (Protocol Data Unit) session points for interconnection with data networks; - packet routing and forwarding; – Policy rule enforcement for packet inspection and user plane parts; - reporting of traffic usage; - uplink classifiers to support routing of traffic flows to data networks; - Branching Points to support multi-homed PDU sessions; - QoS processing for the user plane (e.g. packet filtering, gating, UL/DL rate enforcement; - verification of uplink traffic (mapping of SDF to QoS flows); - Downlink packet buffering and downlink data notification trigger function.
- Anchor points for intra-RAT mobility/inter-RAT mobility if applicable
- External PDU Protocol Data Unit
- – Policy rule enforcement for packet inspection and user plane parts for interconnection with data networks
- - uplink classifiers to support routing of traffic flows to data networks
- branching Points to support multi-homed PDU sessions
- Session Management Function hosts the following main functions: - session management; - allocation and management of IP addresses for UEs; - UPF selection and control; - the ability to configure traffic steering in the User Plane Function (UPF) to route traffic to the proper destination; - policy enforcement and QoS in the control part; - Notification of downlink data.
- UPF User Plane Function
- Figure 27 shows some interactions between UE, gNB and AMF (5GC entity) when UE transitions from RRC_IDLE to RRC_CONNECTED for NAS part (see TS 38.300 v15.6.0).
- RRC is a higher layer signaling (protocol) used for UE and gNB configuration.
- the AMF prepares the UE context data (which includes, for example, the PDU session context, security keys, UE Radio Capabilities, UE Security Capabilities, etc.) and the initial context Send to gNB with INITIAL CONTEXT SETUP REQUEST.
- the gNB then activates AS security together with the UE. This is done by the gNB sending a SecurityModeCommand message to the UE and the UE responding to the gNB with a SecurityModeComplete message.
- the gNB sends an RRCReconfiguration message to the UE, and the gNB receives the RRCReconfigurationComplete from the UE to reconfigure for setting up Signaling Radio Bearer 2 (SRB2) and Data Radio Bearer (DRB) .
- SRB2 Signaling Radio Bearer 2
- DRB Data Radio Bearer
- the step for RRCReconfiguration is omitted as SRB2 and DRB are not set up.
- the gNB notifies the AMF that the setup procedure is complete with an INITIAL CONTEXT SETUP RESPONSE.
- the present disclosure provides control circuitry for operationally establishing a Next Generation (NG) connection with a gNodeB and an operationally NG connection so that signaling radio bearers between the gNodeB and User Equipment (UE) are set up.
- a 5th Generation Core (5GC) entity eg, AMF, SMF, etc.
- AMF Next Generation
- SMF User Equipment
- the gNodeB sends Radio Resource Control (RRC) signaling including a Resource Allocation Configuration Information Element (IE) to the UE via the signaling radio bearer.
- RRC Radio Resource Control
- IE Resource Allocation Configuration Information Element
- the UE then performs uplink transmission or downlink reception based on the resource allocation configuration.
- Figure 28 shows some of the use cases for 5G NR.
- the 3rd generation partnership project new radio (3GPP NR) considers three use cases envisioned by IMT-2020 to support a wide variety of services and applications.
- the first stage of specifications for high-capacity, high-speed communications (eMBB: enhanced mobile-broadband) has been completed.
- Current and future work includes expanding eMBB support, as well as ultra-reliable and low-latency communications (URLLC) and Massively Connected Machine Type Communications (mMTC). Standardization for massive machine-type communications is included
- Figure 28 shows some examples of envisioned usage scenarios for IMT beyond 2020 (see eg ITU-RM.2083 Figure 2).
- URLLC use cases have strict performance requirements such as throughput, latency (delay), and availability.
- URLLLC use cases are envisioned as one of the elemental technologies to realize these future applications such as wireless control of industrial production processes or manufacturing processes, telemedicine surgery, automation of power transmission and distribution in smart grids, and traffic safety. ing.
- URLLLC ultra-reliability is supported by identifying technologies that meet the requirements set by TR 38.913.
- an important requirement includes a target user plane latency of 0.5 ms for UL (uplink) and 0.5 ms for DL (downlink).
- the general URLLC requirement for one-time packet transmission is a block error rate (BLER) of 1E-5 for a packet size of 32 bytes with a user plane latency of 1 ms.
- BLER block error rate
- NRURLC the technical enhancements targeted by NRURLC aim to improve latency and improve reliability.
- Technical enhancements for latency improvement include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplink, slot-level repetition in data channels, and downlink pre-emption.
- Preemption means that a transmission with already allocated resources is stopped and the already allocated resources are used for other transmissions with lower latency/higher priority requirements requested later. Transmissions that have already been authorized are therefore superseded by later transmissions. Preemption is applicable regardless of the concrete service type. For example, a transmission of service type A (URLLC) may be replaced by a transmission of service type B (eg eMBB).
- Technology enhancements for increased reliability include a dedicated CQI/MCS table for a target BLER of 1E-5.
- mMTC massive machine type communication
- NR URLLC NR URLLC
- the stringent requirements are: high reliability (reliability up to 10-6 level), high availability, packet size up to 256 bytes, time synchronization up to several microseconds (depending on the use case, the value 1 ⁇ s or a few ⁇ s depending on the frequency range and latency as low as 0.5 ms to 1 ms (eg, 0.5 ms latency in the targeted user plane).
- NRURLC NR Ultra User Downlink Control Channel
- enhancements for compact DCI PDCCH repetition, and increased PDCCH monitoring.
- enhancement of UCI Uplink Control Information
- enhancement of enhanced HARQ Hybrid Automatic Repeat Request
- minislot refers to a Transmission Time Interval (TTI) containing fewer symbols than a slot (a slot comprises 14 symbols).
- TTI Transmission Time Interval
- the 5G QoS (Quality of Service) model is based on QoS flows, and includes QoS flows that require a guaranteed flow bit rate (GBR: Guaranteed Bit Rate QoS flows), and guaranteed flow bit rates. support any QoS flows that do not exist (non-GBR QoS flows). Therefore, at the NAS level, a QoS flow is the finest granularity of QoS partitioning in a PDU session.
- a QoS flow is identified within a PDU session by a QoS Flow ID (QFI) carried in an encapsulation header over the NG-U interface.
- QFI QoS Flow ID
- 5GC For each UE, 5GC establishes one or more PDU sessions. For each UE, in line with the PDU session, NG-RAN establishes at least one Data Radio Bearers (DRB), eg, as shown above with reference to FIG. Also, additional DRBs for QoS flows for that PDU session can be configured later (up to NG-RAN when to configure). NG-RAN maps packets belonging to different PDU sessions to different DRBs. NAS level packet filters in UE and 5GC associate UL and DL packets with QoS flows, while AS level mapping rules in UE and NG-RAN associate UL and DL QoS flows with DRB.
- DRB Data Radio Bearers
- FIG. 29 shows the non-roaming reference architecture of 5G NR (see TS 23.501 v16.1.0, section 4.23).
- An Application Function eg, an external application server hosting 5G services, illustrated in FIG. 28
- NEF Network Exposure Function
- PCF Policy Control Function
- Application Functions that are considered operator-trusted, based on their deployment by the operator, can interact directly with the associated Network Function.
- Application Functions that are not authorized by the operator to directly access the Network Function communicate with the associated Network Function using the open framework to the outside world via the NEF.
- Figure 29 shows further functional units of the 5G architecture: Network Slice Selection Function (NSSF), Network Repository Function (NRF), Unified Data Management (UDM), Authentication Server Function (AUSF), Access and Mobility Management Function (AMF) , Session Management Function (SMF), and Data Network (DN, eg, service by operator, Internet access, or service by third party). All or part of the core network functions and application services may be deployed and operated in a cloud computing environment.
- NSF Network Slice Selection Function
- NRF Network Repository Function
- UDM Unified Data Management
- AUSF Authentication Server Function
- AMF Access and Mobility Management Function
- SMSF Session Management Function
- DN Data Network
- QoS requirements for at least one of URLLC, eMMB and mMTC services are set during operation to establish a PDU session including radio bearers between a gNodeB and a UE according to the QoS requirements.
- the functions of the 5GC e.g., NEF, AMF, SMF, PCF, UPF, etc.
- a control circuit that, in operation, serves using the established PDU session;
- An application server eg AF of 5G architecture
- ... unit used in this disclosure refers to a “... circuit,” “... device,” “... unit,” or “... module.” The notation may be replaced with each other.
- Each functional block used in the description of the above embodiments is partially or wholly realized as an LSI, which is an integrated circuit, and each process described in the above embodiments is partially or wholly implemented as It may be controlled by one LSI or a combination of LSIs.
- An LSI may be composed of individual chips, or may be composed of one chip so as to include some or all of the functional blocks.
- the LSI may have data inputs and outputs.
- LSIs are also called ICs, system LSIs, super LSIs, and ultra LSIs depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and may be realized with a dedicated circuit, a general-purpose processor, or a dedicated processor. Further, an FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connections and settings of the circuit cells inside the LSI may be used.
- FPGA Field Programmable Gate Array
- reconfigurable processor that can reconfigure the connections and settings of the circuit cells inside the LSI may be used.
- the present disclosure may be implemented as digital or analog processing.
- a communication device may include a radio transceiver and processing/control circuitry.
- a wireless transceiver may include a receiver section and a transmitter section, or functions thereof.
- a wireless transceiver (transmitter, receiver) may include an RF (Radio Frequency) module and one or more antennas.
- RF modules may include amplifiers, RF modulators/demodulators, or the like.
- Non-limiting examples of communication devices include telephones (mobile phones, smart phones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital still/video cameras, etc.).
- digital players digital audio/video players, etc.
- wearable devices wearable cameras, smartwatches, tracking devices, etc.
- game consoles digital book readers
- telehealth and telemedicine (remote health care/medicine prescription) devices vehicles or mobile vehicles with communication capabilities (automobiles, planes, ships, etc.), and combinations of the various devices described above.
- Communication equipment is not limited to portable or movable equipment, but any type of equipment, device or system that is non-portable or fixed, e.g. smart home devices (household appliances, lighting equipment, smart meters or measuring instruments, control panels, etc.), vending machines, and any other "Things" that can exist on the IoT (Internet of Things) network.
- smart home devices household appliances, lighting equipment, smart meters or measuring instruments, control panels, etc.
- vending machines and any other "Things” that can exist on the IoT (Internet of Things) network.
- Communication includes data communication by cellular system, wireless LAN system, communication satellite system, etc., as well as data communication by a combination of these.
- Communication apparatus also includes devices such as controllers and sensors that are connected or coupled to communication devices that perform the communication functions described in this disclosure. Examples include controllers and sensors that generate control and data signals used by communication devices to perform the communication functions of the communication device.
- Communication equipment also includes infrastructure equipment, such as base stations, access points, and any other equipment, device, or system that communicates with or controls the various equipment, not limited to those listed above. .
- a terminal when transmission resources allocated for transmission of an uplink shared channel using a plurality of slots and transmission resources of an uplink control channel overlap in time, the plurality of A second resource amount used for transmitting uplink control information based on the size of data transmitted in the uplink shared channel in a slot and/or the first resource amount of the uplink shared channel in the plurality of slots and a transmission circuit for multiplexing and transmitting the uplink control information and the data in the resource of the determined second resource amount.
- the size is larger than the amount of resources in units of slots or the amount of resources allocated to the initial transmission when repeating transmission of the uplink shared channel.
- the first resource amount is a value different from the number of symbols included in the plurality of slots.
- the size is greater than the amount of resources for each slot or the amount of resources allocated for the initial transmission when repeatedly transmitting the uplink shared channel, and the first amount of resources is , is a value different from the number of symbols included in the plurality of slots.
- control circuit determines the second resource amount based on the data size, the first resource amount, and the third resource amount of the uplink shared channel in the plurality of slots. decide.
- the size of the data is the code block size or transport block size of the data.
- control circuit determines which of the plurality of slots is a slot in which the transmission resource of the uplink shared channel and the transmission resource of the uplink control channel overlap in time. to determine the second resource amount.
- a control circuit that determines the amount of resources used for transmitting the uplink control information in units of slots based on whether or not the uplink control information is multiplexed in the above, and multiplexes the uplink control information and data in the resources of the determined resource amount. and a transmission circuit for transmitting the data.
- control circuit determines whether to zero the amount of resources used for transmitting the uplink control information.
- control circuit determines whether to zero the amount of resources used for transmitting the uplink control information.
- control circuit is configured to control whether the leading slot of the plurality of slots is the overlapping slot or the slot other than the leading slot of the plurality of slots is the overlapping slot. , the amount of resources used for transmitting the uplink control information is varied.
- a terminal receives second downlink control information for allocating downlink shared channel resources after receiving first downlink control information for allocating uplink shared channel resources. and a circuit for transmitting the uplink shared channel based on whether or not the resource of the uplink shared channel temporally overlaps with the resource of the uplink control channel transmitted in response to the reception of the downlink shared channel. and a control circuit for controlling, wherein the uplink shared channel resource spans a plurality of slots, and controlling the transmission of the uplink shared channel is the number of bits of a signal to be transmitted in the uplink shared channel resource. setting resources of the uplink shared channel to unavailable; and controlling HARQ processes for the downlink shared channel.
- the control circuit punctures part of the uplink shared channel resources to obtain the number of bits. below a threshold.
- the signal is an ACK/NACK signal for reception of the downlink shared channel
- the control circuit controls the ACK/NACK signal if the number of bits of the ACK/NACK signal exceeds the threshold.
- the number of bits of the ACK/NACK signal is compressed below the threshold by bundling.
- control circuit prioritizes transmission of the signal using the uplink control channel over transmission of the uplink shared channel, and overlap in time as resources that cannot be used for transmission of the uplink shared channel.
- control circuit disables the HARQ process for the downlink shared channel when the resources of the uplink control channel and the resources of the uplink shared channel overlap in time. do.
- a base station when a transmission resource allocated for transmission of an uplink shared channel using a plurality of slots and a transmission resource for an uplink control channel overlap in terms of time, the plurality of A second resource used for transmitting uplink control information based on the size of data transmitted in the uplink shared channel in the slots and/or the first resource amount of the uplink shared channel in the plurality of slots a control circuit for determining an amount; and a receiving circuit for receiving the uplink control information and the multiplexed data in the resource of the determined second resource amount.
- a communication method enables a terminal to perform , based on the size of data transmitted in the uplink shared channel in the plurality of slots and/or the first resource amount of the uplink shared channel in the plurality of slots, used for transmitting uplink control information
- a second resource amount is determined, and the uplink control information and the data are multiplexed and transmitted in the resource of the determined second resource amount.
- An embodiment of the present disclosure is useful for wireless communication systems.
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Abstract
Description
NR Rel.15/16(Release 15及び/又は16)では、データサイズまたはトランスポートブロックサイズ(TBS: Transport Block Size)は、スロット単位のリソース量に基づいて、及び/又は、Repetitionにおける初回のPUSCH送信に割り当てられるリソース量に基づいて、決定される。なお、リソース量は、例えば、シンボル数又はリソースエレメント数によって表されてよい。また、TBSは、TBサイズと記載される場合がある。
端末の上りリンク送信においては、PUCCHに対する送信リソースとPUSCHに対する送信リソースとが時間的に重なる(衝突する)ことがある。以下では、PUCCHに対する送信リソースとPUSCHに対する送信リソースとが時間的に重なるリソースは、PUCCHとPUSCHとが衝突したリソース(または、スロット)と称される場合がある。
UCI(例えば、ACK/NACK)がPUSCHに多重して送信される場合、PUSCH内でUCIに割り当てられるリソース量(リソースエレメント数)は、式(1)により算出されてよい(例えば、非特許文献4を参照)。
本開示の各実施の形態に係る通信システムは、例えば、少なくとも1つの基地局と、少なくとも1つの端末と、を備える。
[基地局の構成]
図5は、基地局100の構成例を示すブロック図である。図5に例示した基地局100の構成例は、後述する他の実施の形態および変形例を含む本開示の全体を通じて共通であってよい。
次に、図6を参照して、端末200の構成例について説明する。図6に示すように、端末200は、例えば、受信部201、抽出部202、復調部203、復号部204、及び、制御部205を備えてよい。また、端末200は、例えば、符号化部206、変調部207、信号割当部208、及び、送信部209を備えてよい。
TBoMS送信に対するTBSの算出方法について説明する。TBoMSにおいて送信されるTBSは、以下の何れかの方法によって算出されてよい。なお、「算出」は、「導出」、「決定」といった他の用語に相互に読み替えられてもよい。
TBS-Approach 1では、PUSCH送信に使用されるスロット数のリソース量に基づいてTBSを決定する。なお、TBoMSの場合、PUSCH送信に使用されるスロット数は、2以上の整数である。例えば、PUSCH送信に使用されるスロット数のリソース量NREは、以下の式(2)により算出されてもよい。なお、NREは、リソースエレメント数によって表されるリソース量である。
TBS-Approach 2では、スロット単位、または、Repetitionにおける初回のPUSCH送信に割り当てられるリソース量から算出したTBSに、1より大きいスケーリング係数を乗算してTBSを決定する。例えば、スロット単位、または、Repetitionにおける初回のPUSCH送信に割り当てられるリソース量NREは、以下の式(5)により算出されてもよい。なお、NREは、リソースエレメント数によって表されるリソース量である。
上述した方法により決定されたTBサイズを有するTBは、以下の方法により複数スロットを用いて送信されてよい。
NRでは、例えば、再送制御において、Circular Bufferが用いられる。Circular Bufferは、符号器出力を格納したメモリである。Circular Bufferは、割当リソース量に応じたビット数の符号器出力をCircular Bufferにおいて所定の読み出し開始位置(RV: Redundancy Version)から読み出す。RM-Approach 1では、例えば、PUSCH送信に使用されるスロット数のリソース量に応じたビット数の符号器出力を所定のRV位置から読み出し、複数スロットにわたるPUSCHリソースにマッピングしてよい。
RM-Approach 2では、例えば、スロット単位、または、Repetitionにおける初回のPUSCH送信に割り当てられるリソース量に応じたビット数の符号器出力を所定のRV位置から読み出し、スロットのそれぞれまたはRepetitionのPUSCHリソースにマッピングしてよい。また、スロット間、または、Repetition間においてRVが変更されてもよい。
PUCCHとPUSCHとの送信リソースが時間的に重なるスロットにおいて、PUSCH上に割り当てるUCIリソース量は、例えば、スロット単位、または、Repetitionにおける初回のPUSCH送信に割り当てられるリソース量に基づいて決定されてよい。例えば、UCIリソース量は、リソースエレメント数によって表され、スロット単位、または、Repetitionにおける初回のPUSCH送信に割り当てられるリソース量は、シンボル数またはリソースエレメント数によって表されてよい。
PUCCHとPUSCHとの送信リソースが時間的に重なるスロットにおいて、PUSCH上に割り当てるUCIリソース量の決定方法は、上記の例に限定されない。以下、変形例1では、スロット単位、またはRepetitionにおける初回のPUSCH送信に割り当てられるOFDMシンボル数と、TBoMS送信に使用されるスロット数(つまり複数スロット)のリソース量に基づいて決定したTBSと、TBoMS送信に使用される複数スロットにわたるOFDMシンボル数と、を用いて、UCIリソース量が決定される。
本変形例2では、PUSCHの送信に使用される複数スロットの内、PUCCHがどのスロットと衝突するかによって、UCIリソース量の算出方法を異ならせてもよい。
本変形例3では、TBoMS送信に使用される複数スロットの内、PUCCHがどのスロットと衝突するかによって、UCIリソース量の算出方法を異ならせてもよい。
なお、TBSの設定方法(算出方法)については上述した例に限定されない。以下では、TBSの設定方法について補足する。
設定方法1では、例えば、TBサイズは、TBoMS送信のリソースの数(例えば、スロットの数)に基づいて設定されてよい。換言すると、TBサイズは、TBoMS送信の複数のスロットの一つに使用されるスロット(例えば、時間区間)の数に基づいて設定されてよい。
設定方法2では、例えば、TBサイズは、スケーリング係数(又は、scaling factorと呼ぶ)に基づいて設定されてよい。換言すると、TBサイズは、TBoMS送信に使用される複数のスロット(例えば、時間区間)におけるTBサイズのスケーリング係数に基づいて設定されてよい。
TBサイズの別の方法の例について説明する。
NRでは、図2に示したように、PUSCH repetitionの送信に使用される複数スロットの内、1つ以上のスロットにおいて、PUCCHが衝突する場合、PUCCHとPUSCHとが衝突する1以上のスロットにおいて、UCIと上りリンクデータとをPUSCHに多重して送信できる。
例えば、TBoMS送信の第n番目のスロットにおいてPUCCHが衝突し、第n番目のスロットより前のTBoMS送信スロットの何れか少なくとも1つにおいて、すでに、UCIが多重されることが決定されている場合は、第n番目のスロットにおいては、UCIを多重せずに、ドロップする。
TBoMS送信の第n番目のスロットにおいてPUCCHが衝突し、第n番目のスロットより前のTBoMS送信スロットにおいて、すでにUCIが多重されることが決定されている場合は、第n番目のスロットにおいては、一部のUCIを多重せず、ドロップする。
式(1)、(8)、(11)、(12)におけるUCIの符号化率を制御するパラメータβ、及び、UCIリソース量の上限を制御するパラメータαのいずれか一方、もしくは両方をTBoMS送信へ拡張してよい。
なお、上述したOption 1~Option 3の中で、TBoMS送信に用いるスロット数によって、適用するOptionを異ならせてもよい。例えば、TBoMS送信に用いるスロット数が相対的に少ない(例えば2スロット)場合は、Option 3が適用され、TBoMS送信に用いるスロット数が相対的に多い(例えば、4スロットから8スロット)場合は、Option 1が適用されてもよい。カバレッジ拡張度が高くTBoMS送信に用いるスロット数が多い場合にOption 1を適用し、UCIを多重するスロットの数を増加させないことで、PUSCHの伝送品質の劣化を防ぐことができる。
上記の実施の形態1、2では、端末200の上りリンク送信において、PUCCHおよびPUSCHに対する送信リソースが時間的に重なる場合に、UCIと上りリンクデータとをPUSCHに多重するケースについて説明した。NR Rel.15では、PUSCHを割り当てる第1のDCIを受信した後の第2のDCIによって割り当てられたPDSCHに対するACK/NACKを送信するPUCCHリソースを、第1のDCIによって割り当てたPUSCHの送信と時間的に重なるリソースに割り当てることが許されない、という制約がある。
本実施の形態3における方法1を説明する。
本実施の形態3における方法2を説明する。
本実施の形態3における方法3を説明する。
実施の形態3の本変形例1では、端末200に対してTBoMS送信が適用されている場合、PUSCHを割り当てる第1のDCIを受信した後の第2のDCIによって割り当てられたPDSCHに対するACK/NACKを送信するPUCCHリソースを、第1のDCIによって割り当てられたPUSCHの送信と時間的に重なるリソースへ割り当てることを許容する。
上述した方法1、2および3では、端末200に対してPUSCHのTBoMS送信が適用されている場合、PUSCHを割り当てる第1のDCIを受信した後の第2のDCIによって割り当てられたPDSCHに対するACK/NACKを送信するPUCCHリソースを、第1のDCIによって割り当てられたPUSCHの送信と時間的に重なるリソースへ割り当てることを許容した。
NR Rel.16では、PUSCHあるいはACK/NACKといった上りリンク送信に対して優先度を設定できる。例えば、NR Rel.16では優先度レベル数は2であり、優先度インデックス0が設定された上りリンク送信は低優先度であり、優先度インデックス1が設定された上りリンク送信は高優先度である。
TBoMS送信の第n番目のスロットにおいて、PUCCHが衝突した場合、第n番目のスロットより前のTBoMS送信スロットにおいて、すでにUCIが多重されているか否かに応じて、適用する方法を異ならせてもよい。例えば、TBoMS送信の第n番目のスロットにおいてPUCCHが衝突し、第n番目のスロットより前のTBoMS送信スロットにおいてすでにUCIが多重されると決定されていた場合は、第n番目のスロットにおいては、方法2または方法3を適用してよい。例えば、TBoMS送信の第n番目のスロットにおいてPUCCHが衝突し、第n番目のスロットより前のTBoMS送信スロットにおいてUCIが多重されないと決定されている場合は、方法1が適用されてもよい。
本実施の形態3では、端末200に対してPUSCHのTBoMS送信が適用されている場合、PUSCHを割り当てる第1のDCIを受信した後の第2のDCIによって割り当てられたPDSCHに対するACK/NACKを送信するPUCCHリソースを、第1のDCIによって割り当てられたPUSCHの送信と時間的に重なるリソースへ割り当てることを許容して、上述した方法および変形例の何れかを適用した。
上述した実施の形態1、2および3では、端末200に対してPUSCHのTBoMS送信が適用されている場合、PUSCHを割り当てる第1のDCIを受信した後の第2のDCIによって割り当てられたPDSCHに対するACK/NACKを送信するPUCCHリソースを、第1のDCIによって割り当てられたPUSCHの送信と時間的に重なるリソースへ割り当てることを許容した。
TBoMS送信では、スロット数をPUSCH送信に使用可能な上りリンクスロットに基づいてカウントするが、PUSCH送信に使用可能な上りリンクスロットの決定には、以下に示す何れかの決定方法が適用されてもよい。
PUSCH送信に使用可能な上りリンクスロットの決定は、RRCシグナリングに依存してよい。例えば、RRCシグナリングには、TDDの上りリンク/下りリンクスロットフォーマット通知(例えば、semi-static slot format indicator(SFI))などが含まれてよい。
PUSCH送信に使用可能な上りリンクスロットの決定は、例えば、RRCシグナリングおよびTBoMS送信のリソースを割り当てるDCIによる通知に依存してよい。例えば、RRCシグナリングには、TDDの上りリンク/下りリンクスロットフォーマット通知(例えば、semi-static SFI)などが含まれてよい。TBoMS送信のリソースを割り当てるDCIでは、PUSCH送信に使用不可能なスロット(unavailable slot)を直接に(あるいは明示的に)通知してもよいし、RRCシグナリングによって通知された無効な上りリンクスロット/シンボル(invalid UL slot/symbol)を無効とするか有効とするかを指示してもよい。
PUSCH送信に使用可能な上りリンクスロットの決定は、例えば、RRCシグナリング、TBoMS送信のリソースを割り当てるDCIおよび動的なSFIによる通知に依存してよい。例えば、RRCシグナリングには、TDDの上りリンク/下りリンクスロットフォーマット通知(例えば、semi-static SFI)などが含まれてよい。TBoMS送信のリソースを割り当てるDCIでは、PUSCH送信に使用不可能なスロット(unavailable slot)を直接に(あるいは明示的に)通知してもよいし、RRCシグナリングによって通知された無効な上りリンクスロット/シンボル(invalid UL slot/symbol)を無効とするか有効とするかを指示してもよい。動的なSFIには、例えば、Group-common PDCCHによって通知されるTDDの上りリンク/下りリンクスロットフォーマット通知(dynamic SFI)などが含まれてよい。
上述した実施の形態あるいは変形例では、PUSCHのTBoMS送信への適用を例に説明を行ったが、本開示はこれに限定されない。例えば、本開示は、PUSCH repetitionに適用されてよい。例えば、PUSCH repetition方法には、PUSCH repetition Type A enhancementが適用されてもよいし、PUSCH repetition Type Bが適用されてもよい。
上述した実施の形態あるいは変形例では、スロット単位のPUCCH送信への適用例について説明したが、PUCCHの送信単位はスロットに限られない。例えば、PUCCHの送信単位は、NR Rel.16において導入されたサブスロット単位であってもよい。サブスロット単位のPUCCH送信では、サブスロットに含まれるシンボル数がスロットよりも少ない。例えば、スロットに含まれるシンボル数が14(または12)である場合、サブスロットに含まれるシンボル数は2あるいは7(または6)であってもよい。
上述した実施の形態3または変形例では、PUSCHを割り当てる第1のDCIを受信した後の第2のDCIが1つの場合の例について説明した。ここで、例えば図22に示すように、第1のDCIによって割り当てられたPUSCHの送信と時間的に重なるリソースへPUCCHを割り当てるDCIを、端末200は複数受信してもよい。この場合、例えば、端末200が複数のDCIのうち最後に受信したDCIを第2のDCIに置き換えて(あるいは読み替えて)、上述した実施の形態または変形例を適用してもよい。
上述した実施の形態または変形例では、ACK/NACKを送信するPUCCHについて、単一スロットでの送信を例に説明したが、複数スロットを用いてPUCCHが送信されてもよい。例えば、PUCCHについてもRepetitionが適用されてもよい。
上述した実施の形態または変形例では、ACK/NACKの送信を例に説明したが、本開示はACK/NACKに限らず、その他のUCIに適用されてもよい。例えば、NR Rel.17では、下りリンクPDSCHを割り当てるDCIによってAperiodic CSIのPUCCH送信をトリガすることが検討される。第2のDCIによって割り当てられるPUCCHを用いて送信されるUCIを、ACK/NACKからAperiodic CSIに置き換えてもよい。
本実施の形態3では、端末200に対してPUSCHのTBoMS送信が適用されている場合、PUSCHを割り当てる第1のDCIを受信した後の第2のDCIによって割り当てられたPDSCHに対するACK/NACKを送信するPUCCHリソースを、第1のDCIによって割り当てられたPUSCHの送信と時間的に重なるリソースへ割り当てることを許容した。
上述した各実施の形態、各変形例、及び、各補足に示した機能、動作又は処理を端末200がサポートするか否かを示す情報が、例えば、端末200の能力(capability)情報あるいは能力パラメータとして、端末200から基地局100へ送信(あるいは通知)されてもよい。
本開示において、本開示に関連する下り制御信号(情報)は、物理層のPDCCHで送信される信号(情報)でもよく、上位レイヤのMAC CE(Control Element)又はRRCで送信される信号(情報)でもよい。また、下り制御信号は、予め規定されている信号(情報)としてもよい。
本開示において、基地局は、TRP(Transmission Reception Point)、クラスタヘッド、アクセスポイント、RRH(Remote Radio Head)、eNodeB (eNB)、gNodeB(gNB)、BS(Base Station)、BTS(Base Transceiver Station)、親機、ゲートウェイ等でもよい。また、サイドリンク通信においては、1つの端末が基地局に相当する動作を行ってもよい。基地局は、上位ノードと端末の通信を中継する中継装置であってもよい。また、基地局は、路側器であってもよい。
本開示は、上りリンク、下りリンク、サイドリンクのいずれに適用してもよい。例えば、本開示を上りリンクのPUSCH、PUCCH、PRACH、下りリンクのPDSCH、PDCCH、PBCH、サイドリンクのPSSCH(Physical Sidelink Shared Channel)、PSCCH(Physical Sidelink Control Channel)、PSBCH(Physical Sidelink Broadcast Channel)に適用してもよい。
本開示は、データチャネル及び制御チャネルのいずれに適用してもよい。例えば、本開示のチャネルをデータチャネルのPDSCH、PUSCH、PSSCH、制御チャネルのPDCCH、PUCCH、PBCH、PSCCH、PSBCHに置き換えてもよい。
本開示において、参照信号は、基地局及び端末の双方で既知の信号であり、RS (Reference Signal)又はパイロット信号と呼ばれることもある。参照信号は、DMRS、CSI-RS(Channel State Information - Reference Signal)、TRS(Tracking Reference Signal)、PTRS(Phase Tracking Reference Signal)、CRS(Cell-specific Reference Signal), SRS(Sounding Reference Signal)のいずれかであってもよい。
本開示において、時間リソースの単位は、スロット及びシンボルの1つ又は組み合わせに限らず、例えば、フレーム、スーパーフレーム、サブフレーム、スロット、タイムスロット、サブスロット、ミニスロット又は、シンボル、OFDM(Orthogonal Frequency Division Multiplexing)シンボル、SC-FDMA(Single Carrier - Frequency Division Multiple Access)シンボルといった時間リソース単位でもよく、他の時間リソース単位でもよい。また、1スロットに含まれるシンボル数は、上述した実施の形態において例示したシンボル数に限定されず、他のシンボル数でもよい。
本開示は、ライセンスバンド、アンライセンスバンドのいずれに適用してもよい。
本開示は、基地局と端末との間の通信(Uuリンク通信)、端末と端末との間の通信(Sidelink通信)、V2X(Vehicle to Everything)の通信のいずれに適用してもよい。例えば、本開示のチャネルをPSCCH、PSSCH、PSFCH(Physical Sidelink Feedback Channel)、PSBCH、PDCCH、PUCCH、PDSCH、PUSCH、PBCHに置き換えてもよい。
アンテナポートは、1本または複数の物理アンテナから構成される論理的なアンテナ(アンテナグループ)を指す。すなわち、アンテナポートは必ずしも1本の物理アンテナを指すとは限らず、複数のアンテナから構成されるアレイアンテナ等を指すことがある。例えば、アンテナポートが何本の物理アンテナから構成されるかは規定されず、端末が参照信号(Reference signal)を送信できる最小単位として規定される。また、アンテナポートはプリコーディングベクトル(Precoding vector)の重み付けを乗算する最小単位として規定されることもある。
3GPPは、100GHzまでの周波数範囲で動作する新無線アクセス技術(NR)の開発を含む第5世代携帯電話技術(単に「5G」ともいう)の次のリリースに向けて作業を続けている。5G規格の初版は2017年の終わりに完成しており、これにより、5G NRの規格に準拠した端末(例えば、スマートフォン)の試作および商用展開に移ることが可能である。
図26は、NG-RANと5GCとの間の機能分離を示す。NG-RANの論理ノードは、gNBまたはng-eNBである。5GCは、論理ノードAMF、UPF、およびSMFを有する。
- 無線ベアラ制御(Radio Bearer Control)、無線アドミッション制御(Radio Admission Control)、接続モビリティ制御(Connection Mobility Control)、上りリンクおよび下りリンクの両方におけるリソースのUEへの動的割当(スケジューリング)等の無線リソース管理(Radio Resource Management)の機能;
- データのIPヘッダ圧縮、暗号化、および完全性保護;
- UEが提供する情報からAMFへのルーティングを決定することができない場合のUEのアタッチ時のAMFの選択;
- UPFに向けたユーザプレーンデータのルーティング;
- AMFに向けた制御プレーン情報のルーティング;
- 接続のセットアップおよび解除;
- ページングメッセージのスケジューリングおよび送信;
- システム報知情報(AMFまたは運用管理保守機能(OAM:Operation、 Admission、 Maintenance)が発信源)のスケジューリングおよび送信;
- モビリティおよびスケジューリングのための測定および測定報告の設定;
- 上りリンクにおけるトランスポートレベルのパケットマーキング;
- セッション管理;
- ネットワークスライシングのサポート;
- QoSフローの管理およびデータ無線ベアラに対するマッピング;
- RRC_INACTIVE状態のUEのサポート;
- NASメッセージの配信機能;
- 無線アクセスネットワークの共有;
- デュアルコネクティビティ;
- NRとE-UTRAとの緊密な連携。
- Non-Access Stratum(NAS)シグナリングを終端させる機能;
- NASシグナリングのセキュリティ;
- Access Stratum(AS)のセキュリティ制御;
- 3GPPのアクセスネットワーク間でのモビリティのためのコアネットワーク(CN:Core Network)ノード間シグナリング;
- アイドルモードのUEへの到達可能性(ページングの再送信の制御および実行を含む);
- 登録エリアの管理;
- システム内モビリティおよびシステム間モビリティのサポート;
- アクセス認証;
- ローミング権限のチェックを含むアクセス承認;
- モビリティ管理制御(加入およびポリシー);
- ネットワークスライシングのサポート;
- Session Management Function(SMF)の選択。
- intra-RATモビリティ/inter-RATモビリティ(適用可能な場合)のためのアンカーポイント;
- データネットワークとの相互接続のための外部PDU(Protocol Data Unit)セッションポイント;
- パケットのルーティングおよび転送;
- パケット検査およびユーザプレーン部分のポリシールールの強制(Policy rule enforcement);
- トラフィック使用量の報告;
- データネットワークへのトラフィックフローのルーティングをサポートするための上りリンククラス分類(uplink classifier);
- マルチホームPDUセッション(multi-homed PDU session)をサポートするための分岐点(Branching Point);
- ユーザプレーンに対するQoS処理(例えば、パケットフィルタリング、ゲーティング(gating)、UL/DLレート制御(UL/DL rate enforcement);
- 上りリンクトラフィックの検証(SDFのQoSフローに対するマッピング);
- 下りリンクパケットのバッファリングおよび下りリンクデータ通知のトリガ機能。
- セッション管理;
- UEに対するIPアドレスの割当および管理;
- UPFの選択および制御;
- 適切な宛先にトラフィックをルーティングするためのUser Plane Function(UPF)におけるトラフィックステアリング(traffic steering)の設定機能;
- 制御部分のポリシーの強制およびQoS;
- 下りリンクデータの通知。
図27は、NAS部分の、UEがRRC_IDLEからRRC_CONNECTEDに移行する際のUE、gNB、およびAMF(5GCエンティティ)の間のやり取りのいくつかを示す(TS 38.300 v15.6.0参照)。
図28は、5G NRのためのユースケースのいくつかを示す。3rd generation partnership project new radio(3GPP NR)では、多種多様なサービスおよびアプリケーションをサポートすることがIMT-2020によって構想されていた3つのユースケースが検討されている。大容量・高速通信(eMBB:enhanced mobile-broadband)のための第一段階の仕様の策定が終了している。現在および将来の作業には、eMBBのサポートを拡充していくことに加えて、高信頼・超低遅延通信(URLLC:ultra-reliable and low-latency communications)および多数同時接続マシンタイプ通信(mMTC:massive machine-type communicationsのための標準化が含まれる。図28は、2020年以降のIMTの構想上の利用シナリオのいくつかの例を示す(例えばITU-R M.2083 図2参照)。
5GのQoS(Quality of Service)モデルは、QoSフローに基づいており、保証されたフロービットレートが求められるQoSフロー(GBR:Guaranteed Bit Rate QoSフロー)、および、保証されたフロービットレートが求められないQoSフロー(非GBR QoSフロー)をいずれもサポートする。したがって、NASレベルでは、QoSフローは、PDUセッションにおける最も微細な粒度のQoSの区分である。QoSフローは、NG-Uインタフェースを介してカプセル化ヘッダ(encapsulation header)において搬送されるQoSフローID(QFI:QoS Flow ID)によってPDUセッション内で特定される。
101,205 制御部
102 上位制御信号生成部
103 下りリンク制御情報生成部
104,206 符号化部
105,207 変調部
106,208 信号割当部
107,209 送信部
108,201 受信部
109,202 抽出部
110,203 復調部
111,204 復号部
200 端末
Claims (13)
- 複数のスロットを用いた上りリンク共有チャネルの送信に割り当てられた送信リソースと、上りリンク制御チャネルの送信リソースとが時間的に重なる場合に、前記複数のスロットにおける前記上りリンク共有チャネルにおいて送信されるデータのサイズ、及び/又は、前記複数のスロットにおける前記上りリンク共有チャネルの第1リソース量に基づいて、上りリンク制御情報の送信に用いる第2リソース量を決定する制御回路と、
決定した第2リソース量のリソースにおける前記上りリンク制御情報と前記データとを多重して送信する送信回路と、
を備える端末。 - 前記サイズは、前記スロット単位のリソース量、または、前記上りリンク共有チャネルの繰り返し送信を行う場合の初回送信に割り当てられるリソース量よりも大きい、
請求項1に記載の端末。 - 前記第1リソース量は、前記複数のスロットに含まれるシンボル数と異なる値である、
請求項1に記載の端末。 - 前記サイズは、前記スロット単位のリソース量、または、前記上りリンク共有チャネルの繰り返し送信を行う場合の初回送信に割り当てられるリソース量よりも大きく、
前記第1リソース量は、前記複数のスロットに含まれるシンボル数と異なる値である、
請求項1に記載の端末。 - 前記制御回路は、前記データのサイズと、前記第1リソース量と、前記複数のスロットにおける前記上りリンク共有チャネルの第3リソース量に基づいて前記第2リソース量を決定する、
請求項4に記載の端末。 - 前記データのサイズは、前記データのコードブロックサイズまたはトランスポートブロックサイズである、
請求項1に記載の端末。 - 前記制御回路は、前記上りリンク共有チャネルの送信リソースと前記上りリンク制御チャネルの送信リソースとが時間的に重なるスロットが、前記複数のスロットの何れであるかに基づいて、前記第2リソース量を決定する、
請求項1に記載の端末。 - 複数のスロットにおける上りリンク共有チャネルの送信リソースと、上りリンク制御チャネルの送信リソースとが時間的に重なる場合に、重なるスロットよりも時間的に前のスロットにおける上りリンク制御情報の多重の有無に基づいて、上りリンク制御情報の送信に用いるリソース量をスロット単位で決定する制御回路と、
決定したリソース量のリソースにおいて前記上りリンク制御情報とデータとを多重して送信する送信回路と、を備える端末。 - 前記制御回路は、前記上りリンク制御情報の送信に用いるリソース量をゼロにするか否かを決定する、
請求項8に記載の端末。 - 前記制御回路は、前記上りリンク制御情報の送信に用いるリソース量をゼロにするか否かを決定する、
請求項8に記載の端末。 - 前記制御回路は、前記複数のスロットにおける先頭のスロットが、前記重なるスロットである場合と、前記複数のスロットにおける先頭以外のスロットが、前記重なるスロットである場合とで、前記上りリンク制御情報の送信に用いるリソース量を異ならせる、
請求項8に記載の端末。 - 複数のスロットを用いた上りリンク共有チャネルの送信に割り当てられた送信リソースと、上りリンク制御チャネルの送信リソースとが時間的に重なる場合に、前記複数のスロットにおける前記上りリンク共有チャネルにおいて送信されるデータのサイズ、及び/又は、前記複数のスロットにおける前記上りリンク共有チャネルの第1リソース量に基づいて、上りリンク制御情報の送信に用いる第2リソース量を決定する制御回路と、
決定した第2リソース量のリソースにおける前記上りリンク制御情報と、多重された前記データとを受信する受信回路と、
を備える基地局。 - 端末は、
複数のスロットを用いた上りリンク共有チャネルの送信に割り当てられた送信リソースと、上りリンク制御チャネルの送信リソースとが時間的に重なる場合に、前記複数のスロットにおける前記上りリンク共有チャネルにおいて送信されるデータのサイズ、及び/又は、前記複数のスロットにおける前記上りリンク共有チャネルの第1リソース量に基づいて、上りリンク制御情報の送信に用いる第2リソース量を決定し、
決定した第2リソース量のリソースにおける前記上りリンク制御情報と前記データとを多重して送信する、
通信方法。
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Non-Patent Citations (11)
Title |
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3GPP TS 38.211 |
3GPP TS 38.300 |
3GPP TS38.104 |
3GPP TS38.211 |
3GPP TS38.212 |
3GPP TS38.213 |
3GPP TS38.214 |
LG ELECTRONICS: "Discussion on Intra-UE multiplexing/prioritization", 3GPP DRAFT; R1-2100883, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 19 January 2021 (2021-01-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051971235 * |
MODERATOR (APPLE INC.): "Summary of email discussion [104-e-NR-L1enh-URLLC-03] on PUSCH enhancements for NR eURLLC", 3GPP DRAFT; R1-2102106, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 8 February 2021 (2021-02-08), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051977696 * |
NEC: "Discussion on TB processing over multi-slot PUSCH", 3GPP DRAFT; R1-2100943, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 19 January 2021 (2021-01-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051971282 * |
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