WO2024100924A1 - 端末、基地局、及び、通信方法 - Google Patents
端末、基地局、及び、通信方法 Download PDFInfo
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- WO2024100924A1 WO2024100924A1 PCT/JP2023/025372 JP2023025372W WO2024100924A1 WO 2024100924 A1 WO2024100924 A1 WO 2024100924A1 JP 2023025372 W JP2023025372 W JP 2023025372W WO 2024100924 A1 WO2024100924 A1 WO 2024100924A1
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- terminal
- pdsch
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- pusch
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
Definitions
- This disclosure relates to a terminal, a base station, and a communication method.
- a communication system known as the fifth generation mobile communication system (5G) is currently under consideration.
- the 3rd Generation Partnership Project (3GPP) an international standardization organization, is considering the advancement of the 5G communication system from the perspectives of both the advancement of the LTE/LTE-Advanced system and New Radio Access Technology (also known as New RAT or NR), a new method that is not necessarily backward compatible with the LTE/LTE-Advanced system (see, for example, Non-Patent Document 1).
- Non-limiting examples of the present disclosure contribute to providing a terminal, a base station, and a communication method that can appropriately set the uplink transmission timing in the terminal.
- a terminal includes a receiving circuit that receives a first signal and a transmitting circuit that transmits a second signal after receiving the first signal, and the transmission timing of the second signal varies depending on a parameter related to the resource size of the first signal.
- the uplink transmission timing in the terminal can be appropriately set.
- FIG. 1 shows an example of the operation of a base station and a terminal.
- Diagram of an example architecture for a 3GPP NR system Schematic diagram showing functional separation between NG-RAN and 5GC Sequence diagram of Radio Resource Control (RRC) connection setup/reconfiguration procedure
- RRC Radio Resource Control
- RRC Radio Resource Control
- eMBB enhanced Mobile BroadBand
- mMTC massive Machine Type Communications
- URLLC Ultra Reliable and Low Latency Communications
- a radio frame, a slot, and a symbol are each units of physical resources in the time domain.
- the length of one frame may be 10 milliseconds.
- one frame may be composed of multiple slots (for example, 10, 20, or other values).
- the number of slots constituting one frame may be variable depending on the slot length.
- one slot may be composed of multiple symbols (for example, 14 or 12).
- one symbol is the smallest physical resource unit in the time domain, and the symbol length may vary depending on the subcarrier spacing (SCS).
- SCS subcarrier spacing
- a subcarrier and a resource block are each units of physical resources in the frequency domain.
- one resource block may consist of 12 subcarriers.
- one subcarrier may be the smallest physical resource unit in the frequency domain.
- the subcarrier spacing is variable and may be, for example, 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, 960 kHz, or other values.
- eRedCap terminals aim to reduce manufacturing costs, for example, by limiting the characteristics (e.g., capabilities) they support.
- characteristics that eRedCap terminals may support include the following:
- the maximum number of physical resource blocks (PRBs) that can be received and processed per unit time (for example, the total frequency bandwidth occupied by each PRB) is about 5 MHz.
- PRBs physical resource blocks
- SCS subcarrier spacing
- the PRB number corresponding to the characteristics that the above eRedCap terminal can support will be referred to as the "PRB number equivalent to 5 MHz.”
- terminals that support Release 15/16/17 for example, also called Rel-15/16/17) and terminals that support Rel-18 but whose capabilities are greater than those of eRedCap terminals (or terminals whose capabilities are not restricted) are called “non-eRedCap terminals” or “non-eRedCap terminals” in comparison to eRedCap terminals.
- Non-eRedCap terminals terminals that support Release 15/16/17
- Rel-18 terminals that support Rel-18 but whose capabilities are greater than those of eRedCap terminals (or terminals whose capabilities are not restricted)
- Rel-17 RedCap terminals are also included in non-eRedCap terminals.
- both eRedCap and non-eRedCap devices may coexist.
- a base station also called a gNB, for example
- the number of PRBs in the allocated resources may be more than the "number of PRBs equivalent to 5 MHz.”
- a base station may allocate resources that exceed the characteristics that an eRedCap terminal can support.
- this situation may occur during the initial access (random access procedure) when allocating resources for a data channel (e.g., PDSCH: Physical Downlink Shared Channel) that the terminal uses to receive Message 2 (also called Random Access Response (RAR) or Msg 2) and a data channel (e.g., PUSCH: Physical Uplink Shared Channel) that the terminal uses to transmit Message 3 (also called Msg 3).
- a data channel e.g., PDSCH: Physical Downlink Shared Channel
- PUSCH Physical Uplink Shared Channel
- the timing at which the RAR reception process is completed in the eRedCap terminal may be slower than expected by the base station, and the RAR reception process may not be completed by the time resource (transmission timing) of the PUSCH to which Msg 3 is assigned.
- the eRedCap terminal may not be able to transmit Msg 3 before the RAR reception process is completed in the time resource (transmission timing) scheduled by RAR.
- a method may be used to set (or limit) the number of PRBs allocated to the PDSCH for RAR to less than the "number of PRBs equivalent to 5 MHz.”
- the base station will not allocate resources greater than the "number of PRBs equivalent to 5 MHz" as PDSCH resources for RAR. This prevents the timing of completion of the RAR reception process in the eRedCap terminal from being slower than expected by the base station, and the eRedCap terminal can properly transmit Msg 3 in the time resource (transmission timing) of the allocated PUSCH.
- the number of PRBs allocated to the PDSCH for RAR for non-eRedCap terminals is also set (or limited) to a number equal to or less than the "number of PRBs equivalent to 5 MHz", which may result in degraded reception performance for non-eRedCap terminals that are capable of allocating resources greater than the "number of PRBs equivalent to 5 MHz".
- the communication system includes a base station 100 and a terminal 200.
- the terminal 200 may be, for example, an eRedCap terminal or a non-eRedCap terminal.
- FIG. 1 is a block diagram showing an example of the configuration of a portion of a base station 100 according to this embodiment.
- a transmitting unit e.g., corresponding to a transmitting circuit
- a receiving unit e.g., corresponding to a receiving circuit
- receives a second signal e.g., a PUSCH for Msg 3 after transmitting the first signal.
- FIG. 2 is a block diagram showing an example of the configuration of a portion of a terminal 200 according to this embodiment.
- a receiving unit e.g., corresponding to a receiving circuit
- receives a first signal e.g., a PDSCH for RAR
- a transmitting unit e.g., a transmitting circuit
- transmits a second signal e.g., a PUSCH for Msg 3 after receiving the first signal.
- the transmission timing of the second signal varies depending on a parameter related to the resource size (e.g., number of PRBs, TB size, or TB scaling factor) of the first signal (e.g., PDSCH for RAR).
- Fig. 3 is a block diagram showing an example of the configuration of a base station 100 according to this embodiment.
- the base station 100 includes a control unit 101, a Downlink Control Information (DCI) generating unit 102, an RAR generating unit 103, an upper layer signal generating unit 104, an encoding and modulation unit 105, a signal mapping unit 106, a transmitting unit 107, an antenna 108, a receiving unit 109, a signal separating unit 110, and a demodulating and decoding unit 111.
- DCI Downlink Control Information
- At least one of the transmitting unit 107 and the antenna 108 shown in FIG. 3 may be included in the transmitting unit shown in FIG. 1.
- at least one of the antenna 108 and the receiving unit 109 shown in FIG. 3 may be included in the receiving unit shown in FIG. 1.
- the control unit 101 may, for example, determine the resources (e.g., including downlink resources and uplink resources) to be assigned to the terminal 200.
- control unit 101 may instruct the upper layer signal generating unit 104 to generate an upper layer signal (e.g., also called an upper layer parameter or upper layer signaling) based on information about the determined resources.
- control unit 101 may instruct the DCI generating unit 102 to generate control information (e.g., DCI) included in a downlink control channel (e.g., PDCCH) based on information about the determined resources.
- control unit 101 may instruct the RAR generating unit 103 to generate an RAR in a random access procedure based on information about the determined resources.
- the control unit 101 also outputs (or instructs) information regarding downlink resources to the signal placement unit 106, and outputs (or instructs) information regarding uplink resources to the signal separation unit 110.
- the DCI generation unit 102 may generate DCI based on instructions from the control unit 101, and output the generated DCI to the signal placement unit 106, for example.
- the RAR generation unit 103 may generate an RAR based on instructions from the control unit 101, and output the generated RAR to the encoding/modulation unit 105, for example.
- the upper layer signal generating unit 104 may generate an upper layer signal such as system information based on instructions from the control unit 101, and output the generated upper layer signal to the coding and modulation unit 105.
- the coding and modulation unit 105 may, for example, perform error correction coding and modulation on the downlink data, the RAR input from the RAR generation unit 103, and the upper layer signal input from the upper layer signal generation unit 104, and output the modulated signal to the signal arrangement unit 106.
- the signal placement unit 106 may place at least one of the DCI input from the DCI generation unit 102 and the signal input from the coding and modulation unit 105 in resources, for example, based on information regarding downlink resources input from the control unit 101. For example, the signal placement unit 106 may place the signal input from the coding and modulation unit 105 in a PDSCH resource, and place the DCI in a downlink control channel (e.g., PDCCH: Physical Downlink Control Channel) resource. The signal placement unit 106 outputs the signal placed in each resource to the transmission unit 107.
- a downlink control channel e.g., PDCCH: Physical Downlink Control Channel
- the transmitter 107 performs wireless transmission processing, including frequency conversion (e.g., up-conversion) using a carrier wave, on the signal input from the signal placement unit 106, and outputs the signal after wireless transmission processing to the antenna 108.
- frequency conversion e.g., up-conversion
- the antenna 108 radiates a signal (e.g., a downlink signal) input from the transmitting unit 107 toward the terminal 200.
- the antenna 108 also receives an uplink signal transmitted from the terminal 200, for example, and outputs the signal to the receiving unit 109.
- the uplink signal may be, for example, a signal of a channel such as an uplink data channel (e.g., PUSCH), an uplink control channel (e.g., PUCCH: Physical Uplink Control Channel), or a random access channel (e.g., PRACH: Physical Random Access Channel).
- PUSCH uplink data channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- the receiving unit 109 performs radio reception processing, including frequency conversion (e.g., down-conversion), on the signal input from the antenna 108, and outputs the signal after radio reception processing to the signal separation unit 110.
- frequency conversion e.g., down-conversion
- the signal separation unit 110 extracts (or separates) signals on the PUCCH resource (e.g., UCI) and signals on the PRACH (e.g., preamble) from the signals input from the receiving unit 109, based on, for example, information on the uplink resource input from the control unit 101. Furthermore, the signal separation unit 110 outputs, for example, signals on the PUSCH resource from the signals input from the receiving unit 109 to the demodulation and decoding unit 111.
- the PUCCH resource e.g., UCI
- the PRACH e.g., preamble
- the demodulation and decoding unit 111 demodulates and decodes the signal input from the signal separation unit 110 and outputs uplink data.
- FIG. 4 is a block diagram showing an example of the configuration of terminal 200 according to this embodiment.
- the terminal 200 has an antenna 201, a receiving unit 202, a signal separating unit 203, a DCI detecting unit 204, a demodulating and decoding unit 205, a control unit 206, an encoding and modulating unit 207, a signal arrangement unit 208, and a transmitting unit 209.
- At least one of the antenna 201 and the receiving unit 202 shown in FIG. 4 may be included in the receiving unit shown in FIG. 2.
- at least one of the antenna 201 and the transmitting unit 209 shown in FIG. 4 may be included in the transmitting unit shown in FIG. 2.
- the antenna 201 receives, for example, a downlink signal (downlink channel) transmitted by the base station 100 and outputs it to the receiving unit 202.
- the antenna 201 also radiates, for example, an uplink signal (uplink channel) input from the transmitting unit 209 to the base station 100.
- the receiving unit 202 performs radio reception processing, including frequency conversion (e.g., down-conversion), on the signal input from the antenna 201, and outputs the signal after radio reception processing to the signal separation unit 203.
- frequency conversion e.g., down-conversion
- the signal separation unit 203 extracts (e.g., separates) signals on PDCCH resources from the signals input from the receiving unit 202, based on information on downlink resources input from the control unit 206, for example, and outputs the signals to the DCI detection unit 204. Furthermore, the signal separation unit 203 outputs signals on PDSCH resources from the signals input from the receiving unit 202 to the demodulation and decoding unit 205, based on instructions from the control unit 206, for example.
- the DCI detection unit 204 may detect DCI, for example, from a signal (for example, a signal on a PDCCH resource) input from the signal separation unit 203.
- the DCI detection unit 204 may output the detected DCI to the control unit 206, for example.
- the demodulation and decoding unit 205 demodulates and performs error correction decoding on a signal (for example, a signal on a PDSCH resource) input from the signal separation unit 203 to obtain at least one of downlink data, an upper layer signal such as system information, and an RAR.
- the demodulation and decoding unit 205 may, for example, output the upper layer signal and RAR obtained by decoding to the control unit 206.
- the demodulation and decoding unit 205 may also, for example, output the downlink data obtained by decoding.
- the control unit 206 may determine (or identify) downlink resources and uplink resources, for example, based on the DCI input from the DCI detection unit 204 and at least one of the higher layer signal (e.g., system information) and RAR input from the demodulation and decoding unit 205. For example, the control unit 206 may output (e.g., instruct) information regarding the identified downlink resources to the signal separation unit 203, and output (e.g., instruct) information regarding the identified uplink resources to the signal placement unit 208.
- the higher layer signal e.g., system information
- RAR input from the demodulation and decoding unit 205.
- the control unit 206 may output (e.g., instruct) information regarding the identified downlink resources to the signal separation unit 203, and output (e.g., instruct) information regarding the identified uplink resources to the signal placement unit 208.
- the encoding and modulation unit 207 may, for example, encode and modulate uplink data (e.g., Msg 3) and output the modulated signal to the signal arrangement unit 208.
- uplink data e.g., Msg 3
- the signal arrangement unit 208 may, for example, arrange the signal input from the coding and modulation unit 207 in a PUSCH resource, arrange the UCI in a PUCCH resource, and arrange the preamble in a PRACH resource based on information about the uplink resource input from the control unit 206.
- the signal arrangement unit 208 outputs the signal arranged in each resource to the transmission unit 209.
- the transmitter 209 performs wireless transmission processing, including frequency conversion (e.g., up-conversion), on the signal input from the signal placement unit 208, and outputs the signal after wireless transmission processing to the antenna 201.
- frequency conversion e.g., up-conversion
- a minimum time interval (e.g., "m') may be set between the PDSCH for RAR and the PUSCH for Msg 3 when the number of PRBs allocated to the PDSCH for RAR is greater than a threshold value (e.g., "the number of PRBs equivalent to 5 MHz").
- the interval between the time resource of the PDSCH for RAR and the time resource of the PUSCH for Msg 3 may be set to be greater than or equal to the minimum time interval m'.
- the terminal 200 may assume (or anticipate, assume) the transmission (or scheduling, setting) of Msg 3 (PUSCH) at an interval between the time resource of the PDSCH for RAR that is equal to or greater than the minimum time interval m'.
- the terminal 200 may not assume (or anticipate, assume) the transmission (or scheduling, setting) of Msg 3 (PUSCH) at an interval between the time resource of the PDSCH for RAR that is shorter than the minimum time interval m'.
- the terminal 200 can appropriately transmit Msg3 at a timing appropriate to the processing capabilities of the terminal 200.
- FIG. 5 is a flowchart showing an example of processing by a base station 100 (e.g., a gNB) and a terminal 200 (e.g., a UE).
- a base station 100 e.g., a gNB
- a terminal 200 e.g., a UE
- the base station 100 determines, for example, parameters related to the data size of the RAR.
- the parameters related to the data size of the RAR may include at least the number of PRBs assigned to the PDSCH that transmits the RAR.
- the parameters related to the data size of the RAR may include, for example, at least one of a transport block (TB) size set in the PDSCH for the RAR and a TB scaling factor used to determine the TB size set in the PDSCH for the RAR.
- TB transport block
- the base station 100 determines the PDSCH resource for RAR and the PUSCH resource for Msg 3 based on, for example, the parameter related to the data size of the RAR determined in S101 (for example, the number of PRBs).
- the minimum time interval (m') between the PDSCH and the PUSCH when the number of PRBs assigned to the PDSCH is greater than the "number of PRBs equivalent to 5 MHz" may be specified (or set or defined).
- the base station 100 may allocate resources for the PDSCH and PUSCH so that a minimum time interval (m') is secured as the interval between the timing (e.g., symbol, time, or time unit) at which the terminal 200 completes reception of a PDSCH having a PRB number greater than the "PRB number equivalent to 5 MHz" and the timing (e.g., symbol, time, or time unit) at which the terminal 200 starts transmitting a PUSCH (e.g., Msg 3).
- the terminal 200 may perform reception processing of the PDSCH (e.g., RAR) between the timing at which the terminal 200 completes reception of the PDSCH and the timing at which the terminal 200 starts transmitting the PUSCH.
- base station 100 may assign a PDSCH having a number of PRBs greater than "the number of PRBs equivalent to 5 MHz" to slot n, and assign a PUSCH to slot n+k'.
- the value of k' e.g., a length of k' slots
- Base station 100 may determine, for example, information regarding the value of k' as information regarding the PUSCH resource for Msg 3.
- the minimum time interval (m') may be set to a time interval between PDSCH and PUSCH taking into consideration the case where the number of PRBs allocated to the PDSCH is greater than the "number of PRBs equivalent to 5 MHz".
- the minimum time interval (m') may be set based on the receiving processing time (or receiving processing capability) of RAR in the eRedCap terminal when the number of PRBs allocated to the PDSCH for RAR is greater than the "number of PRBs equivalent to 5 MHz".
- the minimum time interval (m') may be set based on the upper limit of the number of PRBs allocated to the PDSCH for RAR.
- the minimum time interval (m') is not limited to being set based on the upper limit of the number of PRBs allocated to the PDSCH for RAR, and may be set based on any of the possible values for the number of PRBs allocated to RAR.
- the minimum time interval (m') may be set to the minimum time interval between the PDSCH and the PUSCH when the number of PRBs allocated to the PDSCH is equal to or less than 20 MHz.
- the number of PRBs used as a reference for setting the minimum time interval (m') is not limited to the number of PRBs equivalent to 20 MHz, and may be the number of PRBs equivalent to another frequency bandwidth.
- the minimum time interval (m') may be set to the minimum time interval between the PDSCH and the PUSCH when the number of PRBs allocated to the PDSCH is within a certain range (for example, a range greater than the number of PRBs equivalent to 5 MHz and less than or equal to the number of PRBs equivalent to 20 MHz).
- a certain range for example, a range greater than the number of PRBs equivalent to 5 MHz and less than or equal to the number of PRBs equivalent to 20 MHz.
- the range of the number of PRBs used as the basis for setting the minimum time interval (m') is not limited to the range of the number of PRBs equivalent to 5 MHz to 20 MHz, and may be the number of PRBs corresponding to another frequency bandwidth range.
- multiple setting value candidates are defined for the minimum time interval (m'), and one of the multiple setting value candidates may be set for the terminal 200, for example, depending on the number of PRBs allocated to the PDSCH.
- the base station 100 may transmit (for example, notify, set) information on the PDSCH resource for RAR determined in S102 to the terminal 200.
- the information on the PDSCH resource for RAR may be notified to the terminal 200 by, for example, a PDCCH (for example, DCI).
- the PDCCH may be scrambled using, for example, a Random Access - Radio Network Temporary Identifier (RA-RNTI).
- RA-RNTI Random Access - Radio Network Temporary Identifier
- the terminal 200 may receive information regarding PDSCH resources for RAR notified from the base station 100, for example, and identify the PDSCH resources for RAR based on the received information.
- Base station 100 transmits an RAR in the PDSCH resource notified in S103 to terminal 200.
- the RAR may include information on the PUSCH resource for Msg3 determined in S102 (for example, information on k').
- the terminal 200 receives the RAR, for example, in the PDSCH resource identified in S104.
- Terminal 200 performs, for example, reception processing of the RAR, and identifies the PUSCH resource for Msg.3 based on information included in the RAR.
- terminal 200 may assume that the resources of the PDSCH and PUSCH are set so that a minimum time interval (m') is secured as the interval between the timing (e.g., symbol or time) at which reception of a PDSCH having a PRB number greater than "the number of PRBs equivalent to 5 MHz" is completed and the timing (e.g., symbol or time) at which transmission of a PUSCH (e.g., Msg 3) is started.
- a minimum time interval e.g., Msg 3
- terminal 200 may assume that, when the number of PRBs allocated to the PDSCH placed in slot n is greater than the "number of PRBs equivalent to 5 MHz", the value of k' that makes the interval between the PDSCH and PUSCH equal to or greater than the minimum time interval m' is notified for slot n+k' in which the PUSCH resource is placed. Terminal 200 may assume, for example, that the length of k' slots (or the slot interval between the PDSCH and PUSCH) is greater than m'.
- the terminal 200 may determine the number of PRBs to be allocated to the PDSCH based on, for example, control information received in advance or control information received using the above-mentioned PDCCH.
- Terminal 200 transmits Msg 3 to base station 100, for example, using the PUSCH resource identified in S107.
- the base station 100 receives Msg 3, for example, on the PUSCH resource determined in S102.
- the base station 100 can allocate time resources for the PUSCH of Msg.3 to the PUSCH for Msg 3, taking into account the data size of the RAR (or the reception processing of the RAR in the eRedCap terminal). This allows the terminal 200 (e.g., the eRedCap terminal) to transmit Msg3 at an appropriate timing suited to the processing capacity of the eRedCap terminal, based on the allocation information included in the received RAR.
- the time resources of the PUSCH may be allocated based on an existing allocation method (e.g., a method that does not consider the minimum time interval (m') or k').
- the time resource interval between the PDSCH and the PUSCH may be set to an interval shorter than the minimum time interval (m').
- the interval between the PDSCH and the PUSCH for slot n+k to which the PUSCH is allocated may be set to be less than m'.
- the value of k e.g., the length of k slots
- the base station 100 may notify the terminal 200 of information regarding the value of k as information regarding the PUSCH resources for Msg 3.
- a minimum time interval (m) between the PDSCH and the PUSCH may be specified when the number of PRBs allocated to the PDSCH is equal to or less than the "number of PRBs equivalent to 5 MHz.”
- the minimum time interval (m) may be set to be smaller than the minimum time interval (m').
- the base station 100 may allocate resources for the PDSCH and PUSCH so that a minimum time interval (m) is secured as the interval between the timing (e.g., symbol or time) at which the terminal 200 completes reception of a PDSCH having a PRB number equal to or less than "a PRB number equivalent to 5 MHz" and the timing (e.g., symbol or time) at which the terminal 200 starts transmitting a PUSCH (e.g., Msg 3).
- a minimum time interval e.g., Msg 3
- terminal 200 may assume that the resources of the PDSCH and PUSCH are set so that a minimum time interval (m) is secured as the interval between the timing (e.g., symbol or time) at which reception of a PDSCH having a PRB number equal to or less than "the number of PRBs equivalent to 5 MHz" is completed and the timing (e.g., symbol or time) at which transmission of a PUSCH (e.g., Msg 3) is started.
- terminal 200 need not assume reception of a PDSCH and transmission of a PUSCH at an interval shorter than the minimum time interval (m).
- the PUSCH resource may be allocated to slot n+k.
- a value of k may be set such that the interval between the PDSCH and PUSCH is equal to or greater than m, and this value may be notified to terminal 200.
- the length of k slots may be set to be greater than m.
- the reception processing time in the terminal 200 e.g., an eRedCap terminal
- the terminal 200 can transmit Msg3 at an earlier timing compared to when the number of PRBs allocated to the PDSCH for RAR is greater than the "number of PRBs equivalent to 5 MHz.”
- the timing of transmitting the PUSCH may be dynamically set (or switched or changed) depending on the number of PRBs allocated to the PDSCH.
- the time resource interval between the PDSCH for RAR and the PUSCH for Msg 3 may differ depending on the number of PRBs allocated to the PDSCH.
- the terminal 200 may transmit the PUSCH in slot n+k, and when the number of PRBs allocated to the PDSCH placed in slot n is greater than the "number of PRBs equivalent to 5 MHz", the terminal 200 may transmit the PUSCH in slot n+k'.
- the terminal 200 can appropriately transmit Msg 3 at a timing according to the data size of the RAR (e.g., the number of PRBs).
- the minimum time interval (m) may be set to a time interval between the PDSCH and the PUSCH that takes into consideration the case where the number of PRBs allocated to the PDSCH is equal to or less than "the number of PRBs equivalent to 5 MHz.”
- the minimum time interval (m) may be set to the minimum time interval between the PDSCH and the PUSCH when the number of PRBs allocated to the PDSCH is equal to or less than 5 MHz.
- multiple setting value candidates are defined for the minimum time interval (m), and one of the multiple setting value candidates may be set for the terminal 200 depending on the number of PRBs allocated to the PDSCH, for example.
- the above describes an example of the operation of the base station 100 and the terminal 200.
- base station 100 transmits a PDSCH for RAR, and receives a PUSCH for Msg 3 after transmitting the PDSCH for RAR.
- terminal 200 receives a PDSCH for RAR, and transmits a PUSCH for Msg 3 after receiving the PDSCH for RAR.
- the transmission timing of the PUSCH for Msg 3 differs depending on a parameter related to the resource size of the PDSCH for RAR (e.g., the number of PRBs).
- the eRedCap terminal can transmit Msg 3 at an appropriate timing according to the processing capability of the eRedCap terminal (e.g., the receiving processing capability of RAR) depending on, for example, the data size of the PDSCH for RAR. Therefore, according to this embodiment, the transmission timing of the uplink in the terminal 200 can be appropriately set.
- the processing capability of the eRedCap terminal e.g., the receiving processing capability of RAR
- the transmission timing of the uplink in the terminal 200 can be appropriately set.
- PRB number equivalent to 5 MHz is used as the reference PRB number for determining the transmission timing of the PUSCH, but this is not limited to this and other PRB numbers may also be used.
- the base station 100 and the terminal 200 according to the present embodiment may be similar to those in the first embodiment.
- a minimum time interval (e.g., "m') may be set between the PDSCH for RAR and the PUSCH for Msg 3 when the TB size of the PDSCH for RAR is greater than a threshold value.
- the interval between the time resource of the PDSCH for RAR and the time resource of the PUSCH for Msg 3 may be set to be equal to or greater than the minimum time interval m'.
- the base station 100 may determine the time resource of the PUSCH for Msg 3 so that the interval with the time resource of the PDSCH for RAR is equal to or greater than the minimum time interval m'.
- the terminal 200 may assume (or anticipate, assume) the transmission (or scheduling, setting) of Msg 3 (PUSCH) at an interval between the time resource of the PDSCH for RAR that is equal to or greater than the minimum time interval m'.
- the terminal 200 may not assume (or anticipate, assume) the transmission (or scheduling, setting) of Msg 3 (PUSCH) at an interval between the time resource of the PDSCH for RAR that is shorter than the minimum time interval m'.
- the terminal 200 can appropriately transmit Msg3 at a timing appropriate to the processing capabilities of the terminal 200.
- An example of the processing of the base station 100 (e.g., gNB) and the terminal 200 (e.g., UE) in this embodiment may be similar to the example of the processing in embodiment 1 shown in FIG. 5.
- the base station 100 determines, for example, parameters related to the data size of the RAR.
- the parameters related to the data size of the RAR may include at least the TB size of the PDSCH for the RAR.
- the parameters related to the data size of the RAR may include, for example, at least one of the number of PRBs allocated to the PDSCH for the RAR and the TB scaling factor used to determine the TB size set in the PDSCH for the RAR.
- the base station 100 determines the PDSCH resource for RAR and the PUSCH resource for Msg 3 based on, for example, the parameter related to the data size of the RAR determined in S101 (for example, TB size).
- a minimum time interval (m') between the PDSCH and the PUSCH when the TB size of the PDSCH is greater than a threshold may be specified (or set or defined).
- the threshold for the PDSCH TB size may be, for example, 1000 bits, or may be another value.
- the threshold may be specified in a standard, may be set in advance in the terminal 200, or may be notified (or set) from the base station 100 to the terminal 200.
- the base station 100 may allocate resources for the PDSCH and PUSCH so that a minimum time interval (m') is secured as the interval between the timing (e.g., symbol, time, or time unit) at which the terminal 200 completes reception of a PDSCH having a TB size larger than a threshold and the timing (e.g., symbol, time, or time unit) at which the terminal 200 starts transmitting a PUSCH (e.g., Msg 3).
- the terminal 200 may perform reception processing of the PDSCH (e.g., RAR) between the timing at which the terminal 200 completes reception of the PDSCH and the timing at which the terminal 200 starts transmitting the PUSCH.
- base station 100 may assign a PDSCH having a TB size larger than a threshold to slot n, and a PUSCH to slot n+k'.
- the value of K' e.g., the length of k' slots
- Base station 100 may determine, for example, information regarding the value of k' as information regarding the PUSCH resource for Msg 3.
- the minimum time interval (m') may be set to a time interval between PDSCH and PUSCH that takes into account the case where the TB size of the PDSCH is larger than a threshold.
- the minimum time interval (m') may be set based on the reception processing time (or reception processing capability) of RAR in an eRedCap terminal when the TB size of the PDSCH for RAR is larger than a threshold.
- the minimum time interval (m') may be set based on the upper limit of the TB size of the PDSCH for RAR.
- the minimum time interval (m') is not limited to being set based on the upper limit of the TB size of the PDSCH for RAR, and may be set based on any of the possible values of the TB size.
- the minimum time interval (m') may be set to the minimum time interval between the PDSCH and the PUSCH when the TB size of the PDSCH is equal to or smaller than a specified value (e.g., 4000 bits).
- a specified value e.g. 4000 bits.
- the TB size value that is the basis for setting the minimum time interval (m') is not limited to 4000 bits and may be another size.
- the minimum time interval (m') may be set to the minimum time interval between the PDSCH and the PUSCH when the TB size of the PDSCH is in a certain range (for example, a range of more than 1000 bits and less than or equal to 4000 bits).
- a certain range for example, a range of more than 1000 bits and less than or equal to 4000 bits.
- the range of TB sizes that is the basis for setting the minimum time interval (m') is not limited to the range of 1000 bits to 4000 bits, and may be other TB size ranges.
- multiple setting value candidates may be specified for the minimum time interval (m'), and one of the multiple setting value candidates may be set for the terminal 200 depending on, for example, the TB size of the PDSCH.
- the base station 100 may transmit (for example, notify, set) information on the PDSCH resource for RAR determined in S102 to the terminal 200.
- the information on the PDSCH resource for RAR may be notified to the terminal 200 by, for example, a PDCCH (for example, DCI).
- the PDCCH may be scrambled using, for example, the RA-RNTI.
- the terminal 200 may receive information regarding PDSCH resources for RAR notified from the base station 100, for example, and identify the PDSCH resources for RAR based on the received information.
- Base station 100 transmits an RAR in the PDSCH resource notified in S103 to terminal 200.
- the RAR may include information on the PUSCH resource for Msg3 determined in S102 (for example, information on k').
- the terminal 200 receives the RAR, for example, in the PDSCH resource identified in S104.
- Terminal 200 performs, for example, reception processing of the RAR, and identifies the PUSCH resource for Msg.3 based on information included in the RAR.
- the terminal 200 may assume that the resources of the PDSCH and PUSCH are set so that a minimum time interval (m') is secured as the interval between the timing (e.g., symbol or time) at which reception of a PDSCH having a TB size larger than the threshold is completed and the timing (e.g., symbol or time) at which transmission of a PUSCH (e.g., Msg 3) is started.
- the terminal 200 may not assume reception of a PDSCH and transmission of a PUSCH at an interval shorter than the minimum time interval (m').
- terminal 200 may assume that, when the TB size of the PDSCH placed in slot n is greater than a threshold, the value of k' that makes the interval between the PDSCH and the PUSCH equal to or greater than the minimum time interval m' for slot n+k' in which the PUSCH resource is placed is notified. Terminal 200 may assume, for example, that the length of k' slots (or the slot interval between the PDSCH and the PUSCH) is greater than m'.
- the terminal 200 may determine the TB size of the PDSCH based on, for example, control information received in advance or control information received using the above-mentioned PDCCH.
- Terminal 200 transmits Msg 3 to base station 100 in the PUSCH resource identified in S107, for example.
- the base station 100 receives Msg 3, for example, in the PUSCH resource determined in S102.
- the base station 100 can allocate time resources of the PUSCH for Msg 3 to the PUSCH for Msg 3, taking into account the data size of the RAR (or the reception processing of the RAR in the eRedCap terminal). This allows the terminal 200 (e.g., the eRedCap terminal) to transmit Msg 3 at an appropriate timing suited to the processing capacity of the eRedCap terminal, based on the allocation information included in the received RAR.
- the time resources of the PUSCH may be allocated based on an existing allocation method (e.g., a method that does not consider the minimum time interval (m') or k').
- the time resource interval between the PDSCH and the PUSCH may be set to an interval shorter than the minimum time interval (m').
- the interval between the PDSCH and the PUSCH for slot n+k to which the PUSCH is assigned may be set to be less than m'.
- the value of k e.g., the length of k slots
- the base station 100 may notify the terminal 200 of information regarding the value of k as information regarding the PUSCH resource for Msg 3.
- a minimum time interval (m) between the PDSCH and the PUSCH when the TB size of the PDSCH is equal to or smaller than a threshold may be specified.
- the minimum time interval (m) may be set to be smaller than the minimum time interval (m').
- the base station 100 may allocate resources for the PDSCH and PUSCH so that a minimum time interval (m) is secured as the interval between the timing (e.g., symbol or time) at which the terminal 200 completes reception of a PDSCH having a TB size equal to or less than a threshold, and the timing (e.g., symbol or time) at which the terminal 200 starts transmitting a PUSCH (e.g., Msg 3).
- a minimum time interval e.g., Msg 3
- terminal 200 may assume that the resources of the PDSCH and PUSCH are set so that a minimum time interval (m) is secured as the interval between the timing (e.g., symbol or time) at which reception of a PDSCH having a TB size equal to or less than a threshold is completed and the timing (e.g., symbol or time) at which transmission of a PUSCH (e.g., Msg 3) is started.
- terminal 200 may not assume reception of a PDSCH and transmission of a PUSCH at an interval shorter than the minimum time interval (m).
- the PUSCH resource may be allocated to slot n+k.
- a value of k may be set so that the interval between the PDSCH and the PUSCH is equal to or larger than m, and this value may be notified to terminal 200.
- the length of k slots may be set to be greater than m.
- the terminal 200 e.g., an eRedCap terminal
- the terminal 200 can transmit Msg3 at an earlier timing compared to when the TB size of the PDSCH for RAR is larger than the threshold.
- the timing of transmitting the PUSCH may be dynamically set (or switched or changed) according to the TB size of the PDSCH.
- the time resource interval between the PDSCH for RAR and the PUSCH for Msg 3 may differ according to the TB size of the PDSCH.
- terminal 200 may transmit a PUSCH in slot n+k when the TB size of the PDSCH placed in slot n is equal to or smaller than a threshold, and transmit a PUSCH in slot n+k' when the TB size of the PDSCH placed in slot n is greater than the threshold.
- terminal 200 can appropriately transmit Msg 3 at a timing according to the data size of the RAR (e.g., the TB size).
- the minimum time interval (m) may be set to a time interval between the PDSCH and the PUSCH that takes into consideration the case where the TB size of the PDSCH is equal to or smaller than a threshold.
- the minimum time interval (m) may be set to the minimum time interval between the PDSCH and the PUSCH when the TB size of the PDSCH is equal to or smaller than 1000 bits.
- multiple setting value candidates are defined for the minimum time interval (m), and one of the multiple setting value candidates may be set for the terminal 200, for example, depending on the TB size set for the PDSCH.
- the above describes an example of the operation of the base station 100 and the terminal 200.
- base station 100 transmits a PDSCH for RAR, and receives a PUSCH for Msg 3 after transmitting the PDSCH for RAR.
- terminal 200 receives a PDSCH for RAR, and transmits a PUSCH for Msg 3 after receiving the PDSCH for RAR.
- the transmission timing of the PUSCH for Msg 3 differs depending on a parameter related to the resource size of the PDSCH for RAR (e.g., TB size).
- the eRedCap terminal can transmit Msg 3 at an appropriate timing according to the processing capability of the eRedCap terminal (e.g., the receiving processing capability of RAR) depending on, for example, the data size of the PDSCH for RAR. Therefore, according to this embodiment, the transmission timing of the uplink in the terminal 200 can be appropriately set.
- the processing capability of the eRedCap terminal e.g., the receiving processing capability of RAR
- the transmission timing of the uplink in the terminal 200 can be appropriately set.
- the TB size (e.g., threshold) that is the basis for determining the transmission timing of the PUSCH may be determined according to the characteristics or capabilities of the eRedCap terminal.
- the base station 100 and the terminal 200 according to the present embodiment may be similar to those in the first embodiment.
- the TB scaling factor (or scaling factor) used to calculate (or determine) the TB size of the PDSCH for RAR is used as a parameter related to the RAR data size.
- a minimum time interval (e.g., "m'") may be set between the PDSCH for RAR and the PUSCH for Msg 3 when the TB scaling factor of the PDSCH for RAR is greater than a threshold.
- the interval between the time resource of the PDSCH for RAR and the time resource of the PUSCH for Msg 3 may be set to be greater than or equal to the minimum time interval m'.
- the base station 100 may determine the time resource of the PUSCH for Msg 3 so that the interval with the time resource of the PDSCH for RAR is greater than or equal to the minimum time interval m'.
- the terminal 200 may assume (or anticipate, assume) the transmission (or scheduling, setting) of Msg 3 (PUSCH) at an interval between the time resource of the PDSCH for RAR that is equal to or greater than the minimum time interval m'.
- the terminal 200 may not assume (or anticipate, assume) the transmission (or scheduling, setting) of Msg 3 (PUSCH) at an interval between the time resource of the PDSCH for RAR that is shorter than the minimum time interval m'.
- the terminal 200 can appropriately transmit Msg3 at a timing appropriate to the processing capabilities of the terminal 200.
- An example of the processing of the base station 100 (e.g., gNB) and the terminal 200 (e.g., UE) in this embodiment may be similar to the example of the processing in embodiment 1 shown in FIG. 5.
- the base station 100 determines, for example, parameters related to the data size of the RAR.
- the parameters related to the data size of the RAR may include at least a TB scaling factor used to determine a TB size set in the PDSCH for the RAR.
- the parameters related to the data size of the RAR may include, for example, at least one of the number of PRBs assigned to the PDSCH for the RAR and the TB size set in the PDSCH for the RAR.
- the base station 100 determines the PDSCH resource for RAR and the PUSCH resource for Msg 3 based on, for example, the parameter related to the data size of the RAR determined in S101 (for example, the TB scaling factor).
- a minimum time interval (m') between PDSCH and PUSCH when the TB scaling factor of the PDSCH is greater than a threshold may be specified (or set, defined).
- the threshold for the PDSCH TB scaling factor may be, for example, 0.5 or another value.
- the threshold may be specified in a standard, may be set in advance in the terminal 200, or may be notified (or set) from the base station 100 to the terminal 200.
- the base station 100 may allocate resources for the PDSCH and PUSCH so that a minimum time interval (m') is secured as the interval between the timing (e.g., symbol, time, or time unit) at which the terminal 200 completes reception of a PDSCH with a TB scaling factor greater than a threshold value and the timing (e.g., symbol, time, or time unit) at which the terminal 200 starts transmitting a PUSCH (e.g., Msg 3).
- the terminal 200 may perform reception processing of the PDSCH (e.g., RAR) between the timing at which the terminal 200 completes reception of the PDSCH and the timing at which the terminal 200 starts transmitting the PUSCH.
- base station 100 may assign a PDSCH with a TB scaling factor larger than a threshold to slot n, and assign a PUSCH to slot n+k'.
- the value of K' e.g., the length of k' slots
- Base station 100 may determine, for example, information regarding the value of k' as information regarding the PUSCH resource for Msg 3.
- the minimum time interval (m') may be set to a time interval between PDSCH and PUSCH taking into consideration the case where the TB scaling factor set in the PDSCH is greater than a threshold value.
- the minimum time interval (m') may be set based on the receiving processing time (or receiving processing capability) of RAR in an eRedCap terminal when the TB scaling factor set in the PDSCH for RAR is greater than a threshold value.
- the minimum time interval (m') may be set based on the upper limit value of the TB scaling factor set in the PDSCH for RAR. Note that the minimum time interval (m') is not limited to being set based on the upper limit value of the TB scaling factor set in the PDSCH for RAR, and may be set based on any of the possible values of the TB scaling factor.
- the minimum time interval (m') may be set to the minimum time interval between the PDSCH and the PUSCH when the TB scaling factor of the PDSCH is equal to or less than a specified value (e.g., 1).
- a specified value e.g. 1
- the value of the TB scaling factor that is the basis for setting the minimum time interval (m') is not limited to 1 and may be another value.
- the minimum time interval (m') may be set to the minimum time interval between the PDSCH and the PUSCH when the TB scaling factor of the PDSCH is in a certain range (for example, a range greater than 0.5 and less than or equal to 1).
- the range of the TB scaling factor that is the basis for setting the minimum time interval (m') is not limited to the range of 0.5 to 1, and may be other TB scaling factor ranges.
- multiple setting value candidates may be specified for the minimum time interval (m'), and one of the multiple setting value candidates may be set for the terminal 200 depending on, for example, the TB scaling factor of the PDSCH.
- the base station 100 may transmit (for example, notify, set) information on the PDSCH resource for RAR determined in S102 to the terminal 200.
- the information on the PDSCH resource for RAR may be notified to the terminal 200 by, for example, a PDCCH (for example, DCI).
- the PDCCH may be scrambled using, for example, the RA-RNTI.
- the terminal 200 may receive information regarding PDSCH resources for RAR notified from the base station 100, for example, and identify the PDSCH resources for RAR based on the received information.
- Base station 100 transmits an RAR in the PDSCH resource notified in S103 to terminal 200.
- the RAR may include information on the PUSCH resource for Msg3 determined in S102 (for example, information on k').
- the terminal 200 receives the RAR, for example, in the PDSCH resource identified in S104.
- Terminal 200 performs, for example, reception processing of the RAR, and identifies the PUSCH resource for Msg.3 based on information included in the RAR.
- the terminal 200 may assume that the PDSCH and PUSCH resources are set so that a minimum time interval (m') is secured as the interval between the timing (e.g., symbol or time) at which the terminal 200 completes reception of a PDSCH with a TB scaling factor set greater than the threshold and the timing (e.g., symbol or time) at which the terminal 200 starts transmitting a PUSCH (e.g., Msg 3).
- a minimum time interval e.g., Msg 3
- the terminal 200 receives a PDSCH with a TB scaling factor set greater than the threshold, the terminal 200 does not need to assume reception of a PDSCH and transmission of a PUSCH at an interval shorter than the minimum time interval (m').
- terminal 200 may assume that, when the TB scaling factor of the PDSCH placed in slot n is greater than a threshold, the value of k' that makes the interval between the PDSCH and PUSCH greater than or equal to the minimum time interval m' for slot n+k' in which the PUSCH resource is placed is notified. Terminal 200 may assume, for example, that the length of k' slots (or the slot interval between the PDSCH and PUSCH) is greater than m'.
- the terminal 200 may determine the TB scaling factor of the PDSCH based on, for example, control information received in advance or control information received using the above-mentioned PDCCH.
- Terminal 200 transmits Msg 3 to base station 100 in the PUSCH resource identified in S107, for example.
- the base station 100 receives Msg 3, for example, in the PUSCH resource determined in S102.
- the base station 100 can allocate time resources of the PUSCH for Msg 3 to the PUSCH for Msg 3, taking into account the data size of the RAR (or the reception processing of the RAR in the eRedCap terminal). This allows the terminal 200 (e.g., an eRedCap terminal) to transmit Msg 3 at an appropriate timing suited to the processing capacity of the eRedCap terminal, based on the allocation information contained in the received RAR.
- the time resources of the PUSCH may be allocated based on an existing allocation method (e.g., a method that does not consider the minimum time interval (m') or k').
- the time resource interval between the PDSCH and the PUSCH may be set to an interval shorter than the minimum time interval (m').
- the interval between the PDSCH and the PUSCH for slot n+k to which the PUSCH is assigned may be set to be less than m'.
- the value of k e.g., the length of k slots
- the base station 100 may, for example, notify the terminal 200 of information regarding the value of k as information regarding the PUSCH resources for Msg 3.
- a minimum time interval (m) between the PDSCH and the PUSCH may be specified when the TB scaling factor of the PDSCH is equal to or less than a threshold.
- the minimum time interval (m) may be set to be smaller than the minimum time interval (m').
- the base station 100 may allocate resources for the PDSCH and PUSCH so that a minimum time interval (m) is secured as the interval between the timing (e.g., symbol or time) at which the terminal 200 completes reception of a PDSCH for which a TB scaling factor equal to or less than a threshold is set, and the timing (e.g., symbol or time) at which the terminal 200 starts transmitting a PUSCH (e.g., Msg 3).
- a minimum time interval e.g., Msg 3
- terminal 200 may assume that the PDSCH and PUSCH resources are set so that a minimum time interval (m) is secured as the interval between the timing (e.g., symbol or time) at which reception of a PDSCH with a TB scaling factor set below a threshold is completed and the timing (e.g., symbol or time) at which transmission of a PUSCH (e.g., Msg 3) is started.
- a minimum time interval (m) is secured as the interval between the timing (e.g., symbol or time) at which reception of a PDSCH with a TB scaling factor set below a threshold is completed and the timing (e.g., symbol or time) at which transmission of a PUSCH (e.g., Msg 3) is started.
- terminal 200 may not need to assume reception of a PDSCH and transmission of a PUSCH at an interval shorter than the minimum time interval (m).
- the PUSCH resource may be allocated to slot n+k.
- a value of k may be set such that the interval between the PDSCH and the PUSCH is equal to or greater than m, and this value may be notified to terminal 200.
- the length of k slots may be set to be greater than m.
- the terminal 200 e.g., an eRedCap terminal
- the terminal 200 can transmit Msg3 at an earlier timing compared to when the TB scaling factor of the PDSCH for RAR is greater than the threshold.
- the timing of transmitting the PUSCH may be dynamically set (or switched or changed) depending on the TB scaling factor of the PDSCH.
- the time resource interval between the PDSCH for RAR and the PUSCH for Msg 3 may differ depending on the TB scaling factor of the PDSCH.
- the terminal 200 may transmit a PUSCH in slot n+k when the TB scaling factor of the PDSCH placed in slot n is equal to or less than a threshold, and transmit a PUSCH in slot n+k' when the TB size of the PDSCH placed in slot n is greater than a threshold.
- the terminal 200 can appropriately transmit Msg 3 at a timing according to the data size of the RAR (e.g., the TB scaling factor).
- the minimum time interval (m) may be set to a time interval between the PDSCH and the PUSCH that takes into consideration the case where the TB scaling factor set in the PDSCH is equal to or less than a threshold.
- the minimum time interval (m) may be set to the minimum time interval between the PDSCH and the PUSCH when the TB scaling factor of the PDSCH is equal to or less than 0.5.
- multiple setting value candidates are defined for the minimum time interval (m), and one of the multiple setting value candidates may be set for the terminal 200 depending on the TB scaling factor set in the PDSCH, for example.
- the above describes an example of the operation of the base station 100 and the terminal 200.
- base station 100 transmits a PDSCH for RAR, and receives a PUSCH for Msg 3 after transmitting the PDSCH for RAR.
- terminal 200 receives a PDSCH for RAR, and transmits a PUSCH for Msg 3 after receiving the PDSCH for RAR.
- the transmission timing of the PUSCH for Msg 3 differs depending on a parameter related to the resource size of the PDSCH for RAR (e.g., TB scaling factor).
- the eRedCap terminal can transmit Msg 3 at an appropriate timing according to the processing capability of the eRedCap terminal (e.g., the receiving processing capability of RAR) depending on, for example, the data size of the PDSCH for RAR. Therefore, according to this embodiment, the transmission timing of the uplink in the terminal 200 can be appropriately set.
- the processing capability of the eRedCap terminal e.g., the receiving processing capability of RAR
- the transmission timing of the uplink in the terminal 200 can be appropriately set.
- the TB scaling factor (e.g., a threshold value) that is the basis for determining the timing of transmitting the PUSCH may be determined according to the characteristics or capabilities of the eRedCap terminal.
- the base station 100 may apply the above-mentioned operation based on the data size of the RAR when the base station 100 permits a connection from an eRedCap terminal in the cell of the base station 100.
- the transmission timing setting of the PUSCH for Msg 3 according to the parameters related to the data size of the RAR may be applied when the cell permits access from an eRedCap terminal (for example, a terminal with limited capability). That is, when the base station 100 prohibits a connection from an eRedCap terminal in the cell of the base station 100, the base station 100 may not apply the transmission timing setting of the PUSCH for Msg 3 according to the parameters related to the data size of the RAR.
- the transmission timing setting of the PUSCH for Msg 3 according to the parameters related to the data size of the RAR described above may be applied to the PDSCH and PUSCH assigned to a terminal 200 that the base station 100 considers (recognizes) to be an eRedCap terminal.
- the transmission timing setting of the PUSCH for Msg 3 according to the parameters related to the data size of the RAR described above may not be applied to the PDSCH and PUSCH assigned to a terminal 200 that the base station 100 does not consider to be an eRedCap terminal.
- Whether or not a terminal 200 is considered by the base station 100 to be an eRedCap terminal can be determined, for example, based on whether or not the terminal 200 has already reported its capability to the base station 100 by a capability report or early indication (e.g., a PRACH transmitted under specific conditions, or an Msg 3 containing specific information).
- a capability report or early indication e.g., a PRACH transmitted under specific conditions, or an Msg 3 containing specific information.
- the values of parameters related to RAR data size may be set (scheduled) to values smaller than a threshold, and may not be set to values equal to or greater than the threshold.
- the RAR data size is more easily set to a size that corresponds to the processing capabilities of the eRedCap terminal, so the RAR processing time can be shortened even on an eRedCap terminal, and the timing of transmitting the PUSCH for Msg3 can be advanced.
- parameters related to data size In the above-mentioned embodiments, the number of PRBs, the TB size, and the TB scaling factor are described as examples of parameters related to data size, but the parameters related to data size may be other parameters different from these.
- the parameters related to data size may be the modulation multi-level number, the code rate, the number of resource elements (RE), the number of transmission layers, or the amount of overhead of a control signal or a reference signal.
- PRB Physical Resource Block
- CRB Common Resource Block
- the number of PRBs corresponding to the characteristics that the eRedCap terminal can support has been described as "a number of PRBs equivalent to 5 MHz," but the frequency bandwidth is not limited to 5 MHz and may be other bandwidths. Also, for the "number of PRBs equivalent to 5 MHz,” the maximum number of PRBs when the SCS is 30 kHz is described as 11, and the maximum number of PRBs when the SCS is 15 kHz is described as 25, but the maximum number of PRBs corresponding to the "number of PRBs equivalent to 5 MHz" in each SCS is not limited to these values and may be other values. Also, the SCS is not limited to 15 kHz and 30 kHz, and may be other values.
- TB size and TB scaling factor values are merely examples, and other values may be used.
- the PRBs in the PDSCH may be arranged contiguously in frequency or non-contiguously in frequency.
- a combination of a PDSCH for RAR and a PUSCH for Msg3 has been described, but the downlink channel is not limited to the PDSCH for RAR and may be another downlink channel or signal, and the uplink channel is not limited to the PUSCH for Msg 3 and may be another uplink channel or signal. Also, the combination of the downlink channel and the uplink channel may be another combination.
- each of the above embodiments may be applied to the following combinations of channels or signals: PDSCH and PRACH for RAR (for example, PRACH may be a signal transmitted when reception of PDSCH fails)
- PDSCH and PUCCH for example, PUCCH may be a channel used to transmit ACK/NACK for PDSCH
- PUSCH for example, PUSCH may be a channel assigned by PDCCH
- SRS Sounding Reference Signal
- a minimum time interval (m') between a PDSCH and a PUCCH may be set when the sum of parameter values related to the data size (e.g., number of PRBs, TB size, or TB scaling factor) of multiple (e.g., two) PDSCHs (e.g., a unicast PDSCH and a broadcast PDSCH, or two broadcast PDSCHs) assigned to terminal 200 at the same time (e.g., symbol or slot) is greater than a threshold.
- the two PDSCHs and PUCCHs may be assigned such that the time interval between the two PDSCHs and PUCCHs is greater than m'.
- a combination of a downlink channel (e.g., PDSCH) and an uplink channel (e.g., PUSCH) is described, but this is not limited thereto, and may be, for example, a combination of an uplink channel and a downlink channel, or a combination including a sidelink channel.
- the values of the parameters (e.g., k, k', m, or m') used in each of the above embodiments may be predefined in a standard, or may be notified to the terminal 200 by a control signal or the like. Also, the values of the parameters (e.g., k, k', m, or m') may be different depending on the processing capability (e.g., 1 or 2), or may be uniquely determined regardless of the processing capability.
- PDSCH or PUSCH resources are allocated by PDCCH, but this is not limiting, and for example, resources may be set by a higher layer signal.
- the above embodiment may be applied to, for example, an "eRedCap terminal", a RedCap terminal, or a non-eRedCap terminal, or may be applied to other types of terminals.
- the characteristic (e.g., characteristic, attribute, or capability) of an eRedCap terminal is that the maximum frequency allocation size (e.g., frequency bandwidth or number of PRBs) supported is below a threshold value.
- the eRedCap terminal may be, for example, a terminal having at least one of the following characteristics.
- an uplink channel such as PRACH and PUSCH, or an uplink signal such as a Sounding Reference Signal (SRS) may be used for the above notification (report).
- SRS Sounding Reference Signal
- uplink channels such as PRACH and PUSCH, or uplink signals such as UCI or SRS may be used for the above report.
- a threshold e.g., 5 MHz or less.
- - A terminal capable of transmitting and receiving signals in a frequency band below a threshold e.g. Frequency Range 1 (FR1) or band below 6 GHz).
- FR1 Frequency Range 1
- - A terminal whose processing time is greater than the threshold.
- a terminal whose available transport block size (TBS) is below a threshold.
- a terminal whose available transmission rank number (e.g., number of MIMO transmission layers) is below a threshold.
- - A terminal whose available modulation order is below a threshold.
- HARQ Hybrid Automatic Repeat reQuest
- the parameters corresponding to the eRedCap terminal may include, for example, a parameter such as a Subscriber Profile ID for RAT/Frequency Priority (SPID).
- SPID Subscriber Profile ID for RAT/Frequency Priority
- non-eRedCap terminal or “non-eRedCap terminal” may refer to, for example, a terminal that supports Rel-15/16/17 (e.g., a terminal that does not support Rel-18), or a terminal that supports Rel-18 but does not have the above characteristics.
- (supplement) Information indicating whether terminal 200 supports the functions, operations or processes described in the above-mentioned embodiments may be transmitted (or notified) from terminal 200 to base station 100, for example, as capability information or capability parameters of terminal 200.
- the capability information may include information elements (IEs) that individually indicate whether the terminal 200 supports at least one of the functions, operations, or processes shown in the above-described embodiments.
- the capability information may include information elements that indicate whether the terminal 200 supports a combination of any two or more of the functions, operations, or processes shown in each of the above-described embodiments, each of the modified examples, and each of the supplementary notes.
- the base station 100 may, for example, determine (or decide or assume) the functions, operations, or processing that the terminal 200 that transmitted the capability information supports (or does not support). The base station 100 may perform operations, processing, or control according to the results of the determination based on the capability information. For example, the base station 100 may control the uplink resources to be assigned to the terminal based on the capability information received from the terminal 200.
- the terminal 200 does not support some of the functions, operations, or processes described in the above-described embodiment may be interpreted as the fact that such some of the functions, operations, or processes are restricted in the terminal 200. For example, information or requests regarding such restrictions may be notified to the base station 100.
- the information regarding the capabilities or limitations of the terminal 200 may be defined in a standard, for example, or may be implicitly notified to the base station 100 in association with information already known at the base station 100 or information transmitted to the base station 100.
- a downlink control signal (or downlink control information) related to an embodiment of the present disclosure may be, for example, a signal (or information) transmitted in a Physical Downlink Control Channel (PDCCH) in a physical layer, or a signal (or information) transmitted in a Medium Access Control Control Element (MAC CE) or Radio Resource Control (RRC) in a higher layer.
- the signal (or information) is not limited to being notified by a downlink control signal, and may be predefined in a specification (or standard), or may be preconfigured in a base station and a terminal.
- the PDCCH may also be transmitted, for example, in either the Common Search Space (CSS) or the UE Specific Search Space (USS).
- CSS Common Search Space
- USS UE Specific Search Space
- the base station may be a Transmission Reception Point (TRP), a cluster head, an access point, a Remote Radio Head (RRH), an eNodeB (eNB), a gNodeB (gNB), a Base Station (BS), a Base Transceiver Station (BTS), a parent device, a gateway, or the like.
- TRP Transmission Reception Point
- RRH Remote Radio Head
- eNB eNodeB
- gNB gNodeB
- BS Base Station
- BTS Base Transceiver Station
- a terminal may play the role of a base station.
- a relay device that relays communication between an upper node and a terminal may be used.
- a roadside unit may be used.
- An embodiment of the present disclosure may be applied to, for example, any of an uplink, a downlink, and a sidelink.
- an embodiment of the present disclosure may be applied to a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH) in the uplink, a Physical Downlink Shared Channel (PDSCH), a PDCCH, a Physical Broadcast Channel (PBCH) in the downlink, or a Physical Sidelink Shared Channel (PSSCH), a Physical Sidelink Control Channel (PSCCH), or a Physical Sidelink Broadcast Channel (PSBCH) in the sidelink.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Broadcast Channel
- PBCH Physical Broadcast Channel
- PSSCH Physical Sidelink Shared Channel
- PSCCH Physical Sidelink Control Channel
- PSBCH Physical Sidelink Broadcast Channel
- PDCCH, PDSCH, PUSCH, and PUCCH are examples of a downlink control channel, a downlink data channel, an uplink data channel, and an uplink control channel, respectively.
- PSCCH and PSSCH are examples of a sidelink control channel and a sidelink data channel.
- PBCH and PSBCH are examples of a broadcast channel, and PRACH is an example of a random access channel.
- An embodiment of the present disclosure may be applied to, for example, any of a data channel and a control channel.
- the channel in an embodiment of the present disclosure may be replaced with any of the data channels PDSCH, PUSCH, and PSSCH, or the control channels PDCCH, PUCCH, PBCH, PSCCH, and PSBCH.
- the reference signal is, for example, a signal known by both the base station and the terminal, and may be referred to as a Reference Signal (RS) or a pilot signal.
- the reference signal may be any of a Demodulation Reference Signal (DMRS), a Channel State Information - Reference Signal (CSI-RS), a Tracking Reference Signal (TRS), a Phase Tracking Reference Signal (PTRS), a Cell-specific Reference Signal (CRS), or a Sounding Reference Signal (SRS).
- DMRS Demodulation Reference Signal
- 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
- the unit of time resource is not limited to one or a combination of slots and symbols, but may be, for example, a time resource unit such as a frame, a superframe, a subframe, a slot, a time slot, a subslot, a minislot, a symbol, an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier - Frequency Division Multiplexing (SC-FDMA) symbol, or another time resource unit.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier - Frequency Division Multiplexing
- 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.
- An embodiment of the present disclosure may be applied to both licensed and unlicensed spectrums (unlicensed spectrum, shared spectrum).
- a channel access procedure (Listen Before Talk (LBT), carrier sense, Channel Clear Assessment (CCA)) may be performed before each signal transmission.
- LBT List Before Talk
- CCA Channel Clear Assessment
- An embodiment of the present disclosure may be applied to any of communication between a base station and a terminal (Uu link communication), communication between terminals (Sidelink communication), and communication of Vehicle to Everything (V2X).
- the PDCCH in an embodiment of the present disclosure may be replaced with a PSCCH, the PUSCH/PDSCH with a PSSCH, the PUCCH with a Physical Sidelink Feedback Channel (PSFCH), and the PBCH with a PSBCH.
- an embodiment of the present disclosure may be applied to either a terrestrial network or a non-terrestrial network (NTN: Non-Terrestrial Network) using a satellite or a High Altitude Pseudo Satellite (HAPS: High Altitude Pseudo Satellite).
- NTN Non-Terrestrial Network
- HAPS High Altitude Pseudo Satellite
- an embodiment of the present disclosure may be applied to a terrestrial network in which the transmission delay is large compared to the symbol length or slot length, such as a network with a large cell size or an ultra-wideband transmission network.
- an antenna port refers to a logical antenna (antenna group) consisting of one or more physical antennas.
- an antenna port does not necessarily refer to one physical antenna, but may refer to an array antenna consisting of multiple antennas.
- an antenna port may be defined as the minimum unit by which a terminal station can transmit a reference signal, without specifying how many physical antennas the antenna port is composed of.
- an antenna port may be defined as the minimum unit by which a weighting of a precoding vector is multiplied.
- 5G fifth generation of mobile phone technology
- NR radio access technology
- the system architecture as a whole assumes an NG-RAN (Next Generation - Radio Access Network) comprising gNBs.
- the gNBs provide the UE-side termination of the NG radio access user plane (SDAP/PDCP/RLC/MAC/PHY) and control plane (RRC) protocols.
- the gNBs are connected to each other via an Xn interface.
- the gNBs are also connected to the Next Generation Core (NGC) via a Next Generation (NG) interface, more specifically to the Access and Mobility Management Function (AMF) (e.g., a specific core entity performing AMF) via an NG-C interface, and to the User Plane Function (UPF) (e.g., a specific core entity performing UPF) via an NG-U interface.
- the NG-RAN architecture is shown in Figure 6 (see, for example, 3GPP TS 38.300 v15.6.0, section 4).
- the NR user plane protocol stack includes the PDCP (Packet Data Convergence Protocol (see, for example, TS 38.300, section 6.4)) sublayer, the RLC (Radio Link Control (see, for example, TS 38.300, section 6.3)) sublayer, and the MAC (Medium Access Control (see, for example, TS 38.300, section 6.2)) sublayer, which are terminated on the network side at the gNB.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- SDAP Service Data Adaptation Protocol
- a control plane protocol stack is also defined for NR (see, for example, 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 clauses 6.4, 6.3, and 6.2 of TS 38.300, respectively.
- the functions of the RRC layer are listed in clause 7 of TS 38.300.
- the Medium-Access-Control layer handles multiplexing of logical channels and scheduling and scheduling-related functions, including handling various numerologies.
- the physical layer is responsible for coding, 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 the transmission of a particular transport channel, and each transport channel is mapped to a corresponding physical channel.
- the physical channels include the PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel) as uplink physical channels, and the PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), and PBCH (Physical Broadcast Channel) as downlink physical channels.
- PRACH Physical Random Access Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- PBCH Physical Broadcast Channel
- NR use cases/deployment scenarios may include enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine type communication (mMTC), which have diverse requirements in terms of data rate, latency, and coverage.
- eMBB enhanced mobile broadband
- URLLC ultra-reliable low-latency communications
- mMTC massive machine type communication
- eMBB is expected to support peak data rates (20 Gbps in the downlink and 10 Gbps in the uplink) and effective (user-experienced) data rates that are about three times higher than the data rates offered by IMT-Advanced.
- URLLC stricter requirements are imposed on ultra-low latency (0.5 ms for user plane latency in UL and DL, respectively) and high reliability (1-10-5 within 1 ms).
- mMTC may require preferably high connection density (1,000,000 devices/km 2 in urban environments), wide coverage in adverse environments, and extremely long battery life (15 years) for low-cost devices.
- OFDM numerology e.g., subcarrier spacing, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval
- OFDM numerology e.g., subcarrier spacing, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval
- low latency services may preferably require a shorter symbol length (and therefore a larger subcarrier spacing) and/or fewer symbols per scheduling interval (also called TTI) than mMTC services.
- deployment scenarios with large channel delay spreads may preferably require a longer CP length than scenarios with short delay spreads.
- Subcarrier spacing may be optimized accordingly to maintain similar CP overhead.
- NR may support one or more subcarrier spacing values. Correspondingly, subcarrier spacings of 15 kHz, 30 kHz, 60 kHz... are currently considered.
- a resource grid of subcarriers and OFDM symbols is defined for the 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).
- Figure 7 shows the functional separation between NG-RAN and 5GC.
- the logical nodes of NG-RAN are gNB or ng-eNB.
- 5GC has logical nodes AMF, UPF, and SMF.
- gNBs and ng-eNBs host the following main functions: - Radio Resource Management functions such as Radio Bearer Control, Radio Admission Control, Connection Mobility Control, dynamic allocation (scheduling) of resources to UEs in both uplink and downlink; - IP header compression, encryption and integrity protection of the data; - Selection of an AMF at UE attach time when routing to an AMF cannot be determined from information provided by the UE; - Routing of user plane data towards the UPF; - Routing of control plane information towards the AMF; - Setting up and tearing down connections; - scheduling and transmission of paging messages; Scheduling and transmission of system broadcast information (AMF or Operation, Admission, Maintenance (OAM) origin); - configuration of measurements and measurement reporting for mobility and scheduling; - Transport level packet marking in the uplink; - Session management; - Support for network slicing; - Management of QoS flows and mapping to data radio bearers; - Support for UEs in RRC_INACTIVE state; - NAS
- the Access and Mobility Management Function hosts the following main functions: – Ability to terminate Non-Access Stratum (NAS) signalling; - NAS signalling security; - Access Stratum (AS) security control; - Core Network (CN) inter-node signaling for mobility between 3GPP access networks; - Reachability to idle mode UEs (including control and execution of paging retransmissions); - Managing the registration area; - Support for intra-system and inter-system mobility; - Access authentication; - Access authorization, including checking roaming privileges; - Mobility management control (subscription and policy); - Support for network slicing; – Selection of Session Management Function (SMF).
- NAS Non-Access Stratum
- AS Access Stratum
- CN Core Network
- the User Plane Function hosts the following main functions: - anchor point for intra/inter-RAT mobility (if applicable); - external PDU (Protocol Data Unit) Session Points for interconnection with data networks; - Packet routing and forwarding; - Packet inspection and policy rule enforcement for the user plane part; - Traffic usage reporting; - an uplink classifier to support routing of traffic flows to the data network; - Branching Point to support multi-homed PDU sessions; QoS processing for the user plane (e.g. packet filtering, gating, UL/DL rate enforcement); - Uplink traffic validation (mapping of SDF to QoS flows); - Downlink packet buffering and downlink data notification triggering.
- PDU Protocol Data Unit Session Points for interconnection with data networks
- Packet routing and forwarding Packet inspection and policy rule enforcement for the user plane part
- Traffic usage reporting - an uplink classifier to support routing of traffic flows to the data network
- - Branching Point to support multi-homed PDU
- Session Management Function hosts the following main functions: - Session management; - Allocation and management of IP addresses for UEs; - Selection and control of UPF; - configuration of traffic steering in the User Plane Function (UPF) to route traffic to the appropriate destination; - Control policy enforcement and QoS; - Notification of downlink data.
- Figure 8 shows some of the interactions between the UE, gNB, and AMF (5GC entities) when the UE transitions from RRC_IDLE to RRC_CONNECTED in the NAS portion (see TS 38.300 v15.6.0).
- RRC is a higher layer signaling (protocol) used for UE and gNB configuration.
- the AMF prepares UE context data (which includes, for example, PDU session context, security keys, UE Radio Capability, UE Security Capabilities, etc.) and sends it to the gNB with an 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 with a SecurityModeComplete message to the gNB.
- the gNB then performs reconfiguration to set up Signaling Radio Bearer 2 (SRB2) and Data Radio Bearer (DRB) by sending an RRCReconfiguration message to the UE and receiving an RRCReconfigurationComplete from the UE.
- SRB2 Signaling Radio Bearer 2
- DRB Data Radio Bearer
- the steps related to RRCReconfiguration are omitted since SRB2 and DRB are not set up.
- the gNB informs the AMF that the setup procedure is complete with an INITIAL CONTEXT SETUP RESPONSE.
- a 5th Generation Core (5GC) entity e.g., AMF, SMF, etc.
- a control circuit that, during operation, establishes a Next Generation (NG) connection with a gNodeB
- a transmitter that, during operation, transmits an initial context setup message to the gNodeB via the NG connection such that a signaling radio bearer between the gNodeB and a user equipment (UE) is set up.
- the gNodeB transmits 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
- Figure 9 shows some of the use cases for 5G NR.
- the 3rd generation partnership project new radio (3GPP NR) considers three use cases that were envisioned by IMT-2020 to support a wide variety of services and applications.
- the first phase of specifications for enhanced mobile-broadband (eMBB) has been completed.
- Current and future work includes standardization for ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC), in addition to expanding support for eMBB.
- Figure 9 shows some examples of envisioned usage scenarios for IMT beyond 2020 (see, for example, ITU-R M.2083 Figure 2).
- the URLLC use cases have stringent requirements for performance such as throughput, latency, and availability. It is envisioned as one of the enabling technologies for future applications such as wireless control of industrial or manufacturing processes, remote medical surgery, automation of power transmission and distribution in smart grids, and road safety.
- URLLC's ultra-high reliability is supported by identifying technologies that meet the requirements set by TR 38.913.
- key requirements include a target user plane latency of 0.5 ms for UL (uplink) and 0.5 ms for DL (downlink).
- the overall URLLC requirement for a single 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
- NR URLLC can be improved in many possible ways.
- Current room for reliability improvement includes defining a separate CQI table for URLLC, more compact DCI formats, PDCCH repetition, etc.
- this room can be expanded to achieve ultra-high reliability as NR becomes more stable and more developed (with respect to the key requirements of NR URLLC).
- Specific use cases for NR URLLC in Release 15 include Augmented Reality/Virtual Reality (AR/VR), e-health, e-safety, and mission-critical applications.
- AR/VR Augmented Reality/Virtual Reality
- e-health e-safety
- mission-critical applications mission-critical applications.
- the technology enhancements targeted by NR URLLC aim to improve latency and reliability.
- Technology enhancements for improving latency include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplink, slot-level repetition in data channel, and pre-emption in downlink.
- Pre-emption means that a transmission for which resources have already been allocated is stopped and the already allocated resources are used for other transmissions with lower latency/higher priority requirements that are requested later. Thus, a transmission that was already allowed is preempted by a later transmission. Pre-emption is applicable regardless of the specific service type. For example, a transmission of service type A (URLLC) may be preempted by a transmission of service type B (eMBB, etc.).
- Technology enhancements for improving reliability include a dedicated CQI/MCS table for a target BLER of 1E-5.
- the mMTC (massive machine type communication) use case is characterized by a very large number of connected devices transmitting relatively small amounts of data that are typically not sensitive to latency.
- the devices are required to be low cost and have very long battery life. From an NR perspective, utilizing very narrow bandwidth portions is one solution that saves power from the UE's perspective and allows for long battery life.
- the scope of reliability improvement in NR is expected to be broader.
- One of the key requirements for all cases, e.g. for URLLC and mMTC, is high or ultra-high reliability.
- Several mechanisms can improve reliability from a radio perspective and a network perspective.
- these areas include compact control channel information, data channel/control channel repetition, and diversity in frequency, time, and/or spatial domains. These areas are generally applicable to reliability improvement regardless of the specific communication scenario.
- NR URLLC For NR URLLC, further use cases with more demanding requirements are envisaged, such as factory automation, transportation and power distribution.
- the demanding requirements are high reliability (up to 10-6 level of reliability), high availability, packet size up to 256 bytes, time synchronization up to a few ⁇ s (depending on the use case, the value can be 1 ⁇ s or a few ⁇ s depending on the frequency range and low latency of 0.5 ms to 1 ms (e.g. 0.5 ms latency at the targeted user plane).
- NR URLLC there may be several technology enhancements from a physical layer perspective. These include PDCCH (Physical Downlink Control Channel) enhancements for compact DCI, PDCCH repetition, and increased monitoring of PDCCH. Also, UCI (Uplink Control Information) enhancements related to enhanced HARQ (Hybrid Automatic Repeat Request) and CSI feedback enhancements. There may also be PUSCH enhancements related to minislot level hopping, and retransmission/repetition enhancements.
- minislot refers to a Transmission Time Interval (TTI) that contains fewer symbols than a slot (a slot comprises 14 symbols).
- TTI Transmission Time Interval
- QoS Quality of Service
- the 5G Quality of Service (QoS) model is based on QoS flows and supports both QoS flows that require a guaranteed flow bit rate (GBR QoS flows) and QoS flows that do not require a guaranteed flow bit rate (non-GBR QoS flows).
- GRR QoS flows Guarantee flow bit rate
- non-GBR QoS flows QoS flows that do not require a guaranteed flow bit rate
- QoS flows are the finest granularity of QoS partitioning in a PDU session.
- QoS flows are identified within a PDU session by a QoS Flow ID (QFI) carried in the 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, the NG-RAN establishes at least one Data Radio Bearer (DRB) for the PDU session, e.g. as shown above with reference to Figure 8. Additional DRBs for the QoS flows of the PDU session can be configured later (when it is up to the NG-RAN).
- DRB Data Radio Bearer
- the NG-RAN maps packets belonging to different PDU sessions to different DRBs.
- the NAS level packet filters in the UE and 5GC associate UL and DL packets with QoS flows, whereas the AS level mapping rules in the UE and NG-RAN associate UL and DL QoS flows with DRBs.
- FIG 10 shows the non-roaming reference architecture for 5G NR (see TS 23.501 v16.1.0, section 4.23).
- An Application Function e.g. an external application server hosting 5G services as illustrated in Figure 9
- AF Application Function
- NEF Network Exposure Function
- PCF Policy Control Function
- Application Functions that are considered trusted by the operator can interact directly with the relevant Network Functions.
- Application Functions that are not allowed by the operator to access the Network Functions directly interact with the relevant Network Functions using an external exposure framework via the NEF.
- Figure 10 further illustrates further functional units of the 5G architecture, namely 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, e.g. operator provided services, Internet access, or third party provided services). All or part of the core network functions and application services may be deployed and run 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
- All or part of the core network functions and application services may be deployed and run in a cloud computing environment.
- an application server e.g., an AF in a 5G architecture
- a transmitter that, in operation, transmits a request including QoS requirements for at least one of a URLLC service, an eMMB service, and an mMTC service to at least one of 5GC functions (e.g., a NEF, an AMF, an SMF, a PCF, an UPF, etc.) to establish a PDU session including a radio bearer between a gNodeB and a UE according to the QoS requirements; and a control circuit that, in operation, performs a service using the established PDU session.
- 5GC functions e.g., a NEF, an AMF, an SMF, a PCF, an UPF, etc.
- the parameter values such as the number of RBs, frequency bandwidth, and SCS are merely examples and may be other values.
- Each functional block used in the description of the above embodiment may be realized partially or entirely as an LSI, which is an integrated circuit, and each process described in the above embodiment may be controlled partially or entirely by one LSI or a combination of LSIs.
- the 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 input and output.
- the LSI may be called an IC, a system LSI, a super LSI, or an ultra LSI.
- the method of integration is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor.
- a field programmable gate array that can be programmed after LSI manufacture, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells inside the LSI may be used.
- FPGA field programmable gate array
- the present disclosure may be realized as digital processing or analog processing.
- an integrated circuit technology that can replace LSI appears due to advances in semiconductor technology or other derived technologies, it is natural that this technology can be used to integrate functional blocks. The application of biotechnology, etc. is also a possibility.
- the present disclosure may be implemented in any type of apparatus, device, or system (collectively referred to as a communications apparatus) having communications capabilities.
- the communications apparatus may include a radio transceiver and processing/control circuitry.
- the radio transceiver may include a receiver and a transmitter, or both as functions.
- the radio transceiver (transmitter and receiver) may include an RF (Radio Frequency) module and one or more antennas.
- the RF module may include an amplifier, an RF modulator/demodulator, or the like.
- Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones, etc.), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks, etc.), cameras (e.g., digital still/video cameras), digital players (e.g., digital audio/video players, etc.), wearable devices (e.g., wearable cameras, smartwatches, tracking devices, etc.), game consoles, digital book readers, telehealth/telemedicine devices, communication-enabled vehicles or mobile transport (e.g., cars, planes, ships, etc.), and combinations of the above-mentioned devices.
- telephones e.g., cell phones, smartphones, etc.
- tablets personal computers (PCs) (e.g., laptops, desktops, notebooks, etc.)
- cameras e.g., digital still/video cameras
- digital players e.g., digital audio/video players, etc.
- wearable devices e.g., wearable cameras, smartwatches, tracking
- Communication devices are not limited to portable or mobile devices, but also include any type of equipment, device, or system that is non-portable or fixed, such as smart home devices (home appliances, lighting equipment, smart meters or measuring devices, control panels, etc.), vending machines, and any other "things” that may exist on an IoT (Internet of Things) network.
- smart home devices home appliances, lighting equipment, smart meters or measuring devices, control panels, etc.
- vending machines and any other “things” that may exist on an IoT (Internet of Things) network.
- IoT Internet of Things
- Communications include data communication via cellular systems, wireless LAN systems, communication satellite systems, etc., as well as data communication via combinations of these.
- the communication apparatus also includes devices such as controllers and sensors that are connected or coupled to a communication device that performs the communication functions described in this disclosure.
- a communication device that performs the communication functions described in this disclosure.
- controllers and sensors that generate control signals and data signals used by the communication device to perform the communication functions of the communication apparatus.
- communication equipment includes infrastructure facilities, such as base stations, access points, and any other equipment, devices, or systems that communicate with or control the various non-limiting devices listed above.
- a terminal includes a receiving circuit that receives a first signal and a transmitting circuit that transmits a second signal after receiving the first signal, and the transmission timing of the second signal varies depending on a parameter related to the resource size of the first signal.
- a minimum time interval between the first signal and the second signal when the value of the parameter is greater than a threshold is set.
- the interval of the time resource between the first signal and the second signal when the value of the parameter is greater than a threshold value is set to be greater than or equal to the minimum time interval.
- the time resource interval between the first signal and the second signal is set to be shorter than the minimum time interval.
- the time resource interval between the first signal and the second signal varies depending on the value of the parameter.
- the parameters are at least one of the number of physical resource blocks (PRBs) assigned to the first signal, the transport block size (TB size) assigned to the first signal, and a TB scaling factor used to calculate the TB size assigned to the first signal.
- PRBs physical resource blocks
- TB size transport block size assigned to the first signal
- TB scaling factor used to calculate the TB size assigned to the first signal.
- the setting of the transmission timing according to the parameters is applied when the cell allows access by a terminal with restricted capabilities.
- the setting of the transmission timing according to the parameters is applied to the first signal and the second signal that are assigned to a terminal that the base station regards as a terminal with limited capability.
- the first signal is a signal on a downlink channel that transmits a random access response in a random access procedure
- the second signal is a signal on an uplink channel that transmits Message 3 in the random access procedure.
- a base station includes a transmitting circuit that transmits a first signal and a receiving circuit that receives a second signal after transmitting the first signal, and the timing of receiving the second signal varies depending on a parameter related to the resource size of the first signal.
- a terminal receives a first signal and transmits a second signal after receiving the first signal, and the transmission timing of the second signal varies depending on a parameter related to a resource size of the first signal.
- a base station transmits a first signal and receives a second signal after transmitting the first signal, and the timing of receiving the second signal varies depending on a parameter related to the resource size of the first signal.
- An embodiment of the present disclosure is useful in wireless communication systems.
- Base station 101 206 Control unit 102 DCI generation unit 103 RAR generation unit 104 Upper layer signal generation unit 105, 207 Coding and modulation unit 106, 208 Signal mapping unit 107, 209 Transmission unit 108, 201 Antenna 109, 202 Reception unit 110 Signal separation unit 111, 205 Demodulation and decoding unit 200 Terminal 203 Signal separation unit 204 DCI detection unit
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Abstract
Description
Release 18 NR(以下、Rel-18とも呼ぶ)では、evolved Reduced Capability NR Devices(eRedCap)と呼ばれる端末(例えば、移動局、又は、user equipment(UE))(例えば、eRedCap端末と呼ぶ)がサポートされる見込みである。eRedCap端末は、サポートする特性(例えば、capability)の制限により、例えば、製造コストの削減等を目指している。eRedCap端末がサポートし得る特性には、例えば、以下の例が挙げられる:
或る時間あたりで受信処理可能なphysical resource block(PRB)数の最大値(例えば、各PRBが占有する周波数帯域幅の総和)が5MHz程度であること。例えば、
- サブキャリア間隔(SCS:subcarrier spacing)が15 kHzであるPRB数の最大値が25個程度、または、
- SCSが30 kHzであるPRB数の最大値が11個程度である。
本実施の形態に係る通信システムは、基地局100、及び、端末200を備える。端末200は、例えば、eRedCap端末でもよく、非eRedCap端末でもよい。
[基地局の構成]
図3は、本実施の形態に係る基地局100の構成例を示すブロック図である。図3において、基地局100は、制御部101と、Downlink Control Information(DCI)生成部102と、RAR生成部103と、上位レイヤ信号生成部104と、符号化・変調部105と、信号配置部106と、送信部107と、アンテナ108と、受信部109と、信号分離部110と、復調・復号部111と、を有する。
図4は、本実施の形態に係る端末200の構成例を示すブロック図である。
次に、上述した基地局100及び端末200の動作例について説明する。
基地局100は、例えば、RARのデータサイズに関するパラメータを決定する。RARのデータサイズに関するパラメータには、少なくとも、RARを送信するPDSCHに割り当てられるPRB数が含まれてよい。また、RARのデータサイズに関するパラメータには、例えば、RAR用のPDSCHに設定されるtransport block(TB)サイズ、及び、RAR用のPDSCHに設定されるTBサイズの決定に用いられるTB scaling factorの少なくとも一つが含まれてよい。
基地局100は、例えば、S101において決定したRARのデータサイズに関するパラメータ(例えば、PRB数)に基づいて、RAR用のPDSCHのリソース、及び、Msg 3用のPUSCHのリソースを決定する。
基地局100は、例えば、S102において決定したRAR用のPDSCHリソースに関する情報を端末200へ送信(例えば、通知、設定)してよい。RAR用のPDSCHリソースに関する情報は、例えば、PDCCH(例えば、DCI)によって端末200へ通知されてもよい。このとき、PDCCHは、例えば、Random Access - Radio Network Temporary Identifier(RA-RNTI)を用いてスクランブリングされてもよい。
基地局100は、例えば、S103において通知したPDSCHリソースにおいてRARを端末200へ送信する。RARには、例えば、S102において決定した、Msg3用のPUSCHリソースに関する情報(例えば、k'に関する情報)が含まれてよい。
端末200は、例えば、RARの受信処理を行い、RARに含まれる情報に基づいて、Msg.3用PUSCHリソースを特定する。
端末200は、例えば、S107において特定したPUSCHリソースにてMsg 3を基地局100へ送信する。
上記動作例では、PDSCHの割り当てPRB数が「5 MHz相当のPRB数」よりも大きい場合のPUSCHのリソース割り当てについて説明した。
本実施の形態に係る基地局100及び端末200は、実施の形態1と同様でよい。
基地局100は、例えば、RARのデータサイズに関するパラメータを決定する。RARのデータサイズに関するパラメータには、少なくとも、RAR用のPDSCHのTBサイズが含まれてよい。また、RARのデータサイズに関するパラメータには、例えば、RAR用のPDSCHの割り当てPRB数、及び、RAR用のPDSCHに設定されるTBサイズの決定に用いられるTB scaling factorの少なくとも一つが含まれてよい。
基地局100は、例えば、S101において決定したRARのデータサイズに関するパラメータ(例えば、TBサイズ)に基づいて、RAR用のPDSCHのリソース、及び、Msg 3用のPUSCHのリソースを決定する。
基地局100は、例えば、S102において決定したRAR用のPDSCHリソースに関する情報を端末200へ送信(例えば、通知、設定)してよい。RAR用のPDSCHリソースに関する情報は、例えば、PDCCH(例えば、DCI)によって端末200へ通知されてもよい。このとき、PDCCHは、例えば、RA-RNTIを用いてスクランブリングされてもよい。
基地局100は、例えば、S103において通知したPDSCHリソースにおいてRARを端末200へ送信する。RARには、例えば、S102において決定した、Msg3用のPUSCHリソースに関する情報(例えば、k'に関する情報)が含まれてよい。
端末200は、例えば、RARの受信処理を行い、RARに含まれる情報に基づいて、Msg.3用PUSCHリソースを特定する。
端末200は、例えば、S107において特定したPUSCHリソースにおいてMsg 3を基地局100へ送信する。
上記動作例では、PDSCHのTBサイズが閾値よりも大きい場合のPUSCHのリソース割り当てについて説明した。
本実施の形態に係る基地局100及び端末200は、実施の形態1と同様でよい。
基地局100は、例えば、RARのデータサイズに関するパラメータを決定する。RARのデータサイズに関するパラメータには、少なくとも、RAR用のPDSCHに設定されるTBサイズの決定に用いられるTB scaling factorが含まれてよい。また、RARのデータサイズに関するパラメータには、例えば、RAR用のPDSCHに割り当てられるPRB数、及び、RAR用のPDSCHに設定されるTBサイズの少なくとも一つが含まれてよい。
基地局100は、例えば、S101において決定したRARのデータサイズに関するパラメータ(例えば、TB scaling factor)に基づいて、RAR用のPDSCHのリソース、及び、Msg 3用のPUSCHのリソースを決定する。
基地局100は、例えば、S102において決定したRAR用のPDSCHリソースに関する情報を端末200へ送信(例えば、通知、設定)してよい。RAR用のPDSCHリソースに関する情報は、例えば、PDCCH(例えば、DCI)によって端末200へ通知されてもよい。このとき、PDCCHは、例えば、RA-RNTIを用いてスクランブリングされてもよい。
基地局100は、例えば、S103において通知したPDSCHリソースにおいてRARを端末200へ送信する。RARには、例えば、S102において決定した、Msg3用のPUSCHリソースに関する情報(例えば、k'に関する情報)が含まれてよい。
端末200は、例えば、RARの受信処理を行い、RARに含まれる情報に基づいて、Msg.3用PUSCHリソースを特定する。
端末200は、例えば、S107において特定したPUSCHリソースにおいてMsg 3を基地局100へ送信する。
上記動作例では、PDSCHのTB scaling factorが閾値よりも大きい場合のPUSCHのリソース割り当てについて説明した。
(1)上記各実施の形態において、基地局100は、基地局100のセルにおいてeRedCap端末からの接続を許可している場合に、上述したRARのデータサイズに基づく動作を適用してもよい。例えば、RARのデータサイズに関するパラメータに応じたMsg 3用のPUSCHの送信タイミング設定は、eRedCap端末(例えば、capabilityが制限される端末)のアクセスをセルが許可している場合に適用されてよい。すなわち、基地局100は、基地局100のセルにおいてeRedCap端末からの接続を禁止している場合、上述したRARのデータサイズに関するパラメータに応じたMsg 3用のPUSCHの送信タイミング設定を適用しなくてもよい。
上記各実施の形態では、データサイズに関するパラメータの例として、PRB数、TBサイズ、及び、TB scaling factorについて説明したが、データサイズに関するパラメータは、これらと異なる他のパラメータでもよい。例えば、データサイズに関するパラメータは、変調多値数、コードレート、リソースエレメント(RE:Resource Element)の数、送信レイヤ数、又は、制御信号又は参照信号のオーバーヘッドの量でもよい。
PDSCHにおけるPRBの配置は、周波数的に連続の配置でもよく、周波数的に非連続の配置でもよい。
上記各実施の形態では、RAR用のPDSCHと、Msg3用のPUSCHとの組み合わせについて説明したが、下りリンクチャネルは、RAR用のPDSCHに限定されず、他の下りリンクチャネル又は信号でもよく、上りリンクチャネルは、Msg 3用のPUSCHに限定されず、他の上りリンクチャネル又は信号でもよい。また、下りリンクチャネルと上りリンクチャネルとの組み合わせは、他の組み合わせでもよい。
- RAR用PDSCHとPRACH(例えば、PRACHは、PDSCHの受信に失敗したときに送信される信号でもよい)
- PDSCHとPUCCH(例えば、PUCCHは、PDSCHに対するACK/NACKの送信に用いるチャネルでもよい)
-PDCCHとPUSCH(例えば、PUSCHは、PDCCHによって割り当てられるチャネルでもよい)
-PDCCHとSounding Reference Signal(SRS)(例えば、SRSは、PDCCHによって割り当てられる信号でもよい)
上記各実施の形態において用いるパラメータ(例えば、k、k'、m又はm')の値は規格において予め規定されてもよく、制御信号等によって端末200へ通知されてもよい。また、パラメータ(例えば、k、k'、m又はm')の値は、processing capability(例えば、1又は2)に応じて異なる値でもよく、processing capabilityに依らず一意に決められる値でもよい。
上記実施の形態は、例えば、“eRedCap端末”に適用されてもよく、RedCap端末、又は、非eRedCap端末に適用されてもよく、他の種類の端末に適用されてもよい。
(1)「カバレッジ拡張の対象である端末」、「繰り返し送信される信号を受信する端末」、又は、「eRedCap端末」であることを基地局100へ通知(例えば、報告、report)する端末。なお、上記通知(report)には、例えば、PRACH及びPUSCHといった上りチャネル、又は、Sounding Reference Signal(SRS)といった上り信号が使用されてもよい。
(2)以下の性能(capability)の少なくとも一つに該当する端末、または、以下の性能の少なくとも一つを基地局100へ報告する端末。なお、上記報告には、例えば、PRACH及びPUSCHといった上りチャネル、又は、UCI又はSRSといった上り信号が使用されてもよい。
-送受信可能な周波数帯域幅(例えば、最大値)が閾値以下(例えば、5MHz以下)の端末
-送受信可能なPRB数(例えば、最大数)が閾値以下(例えば、25個以下又は11個以下)の端末
-実装される受信アンテナ数が閾値以下(例えば、閾値=1本)の端末。
-サポート可能な下りポート数(例えば、受信アンテナポート数)が閾値以下(例えば、閾値=2)の端末。
-サポート可能な送信ランク数(例えば、最大Multiple-Input Multiple-Output(MIMO)レイヤ数(又はrank数))が閾値以下(例えば、閾値=2)の端末。
-信号を閾値以下の周波数帯域(例えば、Frequency Range 1(FR1)又は6GHz以下の帯域)において送受信可能な端末。
-処理時間が閾値以上の端末。
-利用可能なトランスポートブロックの大きさ(TBS:transport block size)が閾値以下の端末。
-利用可能な送信ランク数(例えば、MIMO送信レイヤ数)が閾値以下の端末。
-利用可能な変調次数(modulation order)が閾値以下の端末。
-利用可能なHybrid Automatic Repeat reQuest(HARQ) process数が閾値以下の端末。
-Rel-18以降をサポートする端末。
(3)eRedCap端末に対応するパラメータが基地局100から通知される端末。なお、eRedCap端末に対応するパラメータには、例えば、Subscriber Profile ID for RAT/Frequency Priority(SPID)といったパラメータが含まれてもよい。
上述した実施の形態に示した機能、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、本開示の一実施例に関連する下り制御信号(又は、下り制御情報)は、例えば、物理層のPhysical Downlink Control Channel(PDCCH)において送信される信号(又は、情報)でもよく、上位レイヤのMedium Access Control Control Element(MAC CE)又はRadio Resource Control(RRC)において送信される信号(又は、情報)でもよい。また、信号(又は、情報)は、下り制御信号によって通知される場合に限定されず、仕様(又は、規格)において予め規定されてもよく、基地局及び端末に予め設定されてもよい。
本開示の一実施例において、基地局は、Transmission Reception Point(TRP)、クラスタヘッド、アクセスポイント、Remote Radio Head(RRH)、eNodeB (eNB)、gNodeB(gNB)、Base Station(BS)、Base Transceiver Station(BTS)、親機、ゲートウェイなどでもよい。また、サイドリンク通信では、基地局の役割を端末が担ってもよい。また、基地局の代わりに、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、路側器であってもよい。
本開示の一実施例は、例えば、上りリンク、下りリンク、及び、サイドリンクの何れに適用してもよい。例えば、本開示の一実施例を上りリンクのPhysical Uplink Shared Channel(PUSCH)、Physical Uplink Control Channel(PUCCH)、Physical Random Access Channel(PRACH)、下りリンクのPhysical Downlink Shared Channel(PDSCH)、PDCCH、Physical Broadcast Channel(PBCH)、又は、サイドリンクのPhysical Sidelink Shared Channel(PSSCH)、Physical Sidelink Control Channel(PSCCH)、Physical Sidelink Broadcast Channel(PSBCH)に適用してもよい。
本開示の一実施例は、例えば、データチャネル及び制御チャネルの何れに適用してもよい。例えば、本開示の一実施例におけるチャネルをデータチャネルのPDSCH、PUSCH、PSSCH、又は、制御チャネルのPDCCH、PUCCH、PBCH、PSCCH、PSBCHの何れかに置き換えてもよい。
本開示の一実施例において、参照信号は、例えば、基地局及び端末の双方で既知の信号であり、Reference Signal(RS)又はパイロット信号と呼ばれることもある。参照信号は、Demodulation Reference Signal(DMRS)、Channel State Information - Reference Signal(CSI-RS)、Tracking Reference Signal(TRS)、Phase Tracking Reference Signal(PTRS)、Cell-specific Reference Signal(CRS)、又は、Sounding Reference Signal(SRS)の何れでもよい。
本開示の一実施例において、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、Orthogonal Frequency Division Multiplexing(OFDM)シンボル、Single Carrier - Frequency Division Multiplexing(SC-FDMA)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。
本開示の一実施例は、ライセンスバンド、アンライセンスバンド(unlicensed spectrum, shared spectrum)のいずれに適用してもよい。アンライセンスバンドの場合、各信号の送信前にchannel access procedure (Listen Before Talk (LBT)、キャリアセンス、Channel Clear Assessment (CCA))が実施されてもよい。
本開示の一実施例は、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)、Vehicle to Everything(V2X)の通信のいずれに適用してもよい。例えば、本開示の一実施例におけるPDCCHをPSCCH、PUSCH/PDSCHをPSSCH、PUCCHをPhysical Sidelink Feedback Channel(PSFCH)、PBCHをPSBCHに置き換えてもよい。
本開示の一実施例において、アンテナポートは、1本又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。例えば、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、端末局が基準信号(Reference signal)を送信できる最小単位として規定されてよい。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7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8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9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9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。
101,206 制御部
102 DCI生成部
103 RAR生成部
104 上位レイヤ信号生成部
105,207 符号化・変調部
106,208 信号配置部
107,209 送信部
108,201 アンテナ
109,202 受信部
110 信号分離部
111,205 復調・復号部
200 端末
203 信号分離部
204 DCI検出部
Claims (12)
- 第1の信号を受信する受信回路と、
前記第1の信号を受信した後に第2の信号を送信する送信回路と、
を具備し、
前記第2の信号の送信タイミングは、前記第1の信号のリソースサイズに関するパラメータに応じて異なる、
端末。 - 前記パラメータの値が閾値より大きい場合の前記第1の信号と前記第2の信号との間の最小時間間隔が設定される、
請求項1に記載の端末。 - 前記パラメータの値が閾値より大きい場合の前記第1の信号と前記第2の信号との間の時間リソースの間隔は、前記最小時間間隔以上に設定される、
請求項2に記載の端末。 - 前記パラメータの値が前記閾値以下の場合、前記第1の信号と前記第2の信号との間の時間リソース間隔は、前記最小時間間隔より短く設定される、
請求項2に記載の端末。 - 前記第1の信号と前記第2の信号との間の時間リソース間隔は、前記パラメータの値に応じて異なる、
請求項2に記載の端末。 - 前記パラメータは、前記第1の信号に割り当てられる物理リソースブロック(PRB)数、前記第1の信号に割り当てられるトランスポートブロックサイズ(TBサイズ)、及び、前記第1の信号に割り当てられるTBサイズの算出に用いるTB scaling factorの少なくとも一つである、
請求項1に記載の端末。 - 前記パラメータに応じた前記送信タイミングの設定は、capabilityが制限される端末のアクセスをセルが許可している場合に適用される、
請求項1に記載の端末。 - 前記パラメータに応じた前記送信タイミングの設定は、capabilityが制限される端末であると基地局が見なしている端末に対して割り当てられる前記第1の信号及び前記第2の信号に対して適用される、
請求項1に記載の端末。 - 前記第1の信号は、ランダムアクセス手順におけるランダムアクセス応答を送信する下りリンクチャネルの信号であり、
前記第2の信号は、ランダムアクセス手順におけるMessage 3を送信する上りリンクチャネルの信号である、
請求項1に記載の端末。 - 第1の信号を送信する送信回路と、
前記第1の信号を送信した後に第2の信号を受信する受信回路と、
を具備し、
前記第2の信号の受信タイミングは、前記第1の信号のリソースサイズに関するパラメータに応じて異なる、
基地局。 - 端末は、
第1の信号を受信し、
前記第1の信号を受信した後に第2の信号を送信し、
前記第2の信号の送信タイミングは、前記第1の信号のリソースサイズに関するパラメータに応じて異なる、
通信方法。 - 基地局は、
第1の信号を送信し、
前記第1の信号を送信した後に第2の信号を受信し、
前記第2の信号の受信タイミングは、前記第1の信号のリソースサイズに関するパラメータに応じて異なる、
通信方法。
Priority Applications (5)
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| JP2024557019A JPWO2024100924A5 (ja) | 2023-07-10 | 端末、通信方法及び集積回路 | |
| CN202380076978.3A CN120153749A (zh) | 2022-11-07 | 2023-07-10 | 终端、基站及通信方法 |
| KR1020257013339A KR20250099126A (ko) | 2022-11-07 | 2023-07-10 | 단말, 기지국, 및, 통신 방법 |
| EP23888281.5A EP4618683A4 (en) | 2022-11-07 | 2023-07-10 | TERMINAL, BASE STATION, AND COMMUNICATION METHOD |
| MX2025004119A MX2025004119A (es) | 2022-11-07 | 2025-04-07 | Terminal, estacion base y metodo de comunicacion |
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| EP (1) | EP4618683A4 (ja) |
| KR (1) | KR20250099126A (ja) |
| CN (1) | CN120153749A (ja) |
| MX (1) | MX2025004119A (ja) |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020092434A (ja) * | 2015-01-30 | 2020-06-11 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | マシンタイプ通信(mtc)のためのランダムアクセス手順およびブロードキャスト優先度付け |
| JP2022178216A (ja) | 2021-05-19 | 2022-12-02 | 渡辺人形有限会社 | アクリル板製品の製造方法およびアクリル板 |
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| WO2022140450A1 (en) * | 2020-12-21 | 2022-06-30 | Ofinno, Llc | Scheduling random access response for reduced capability device |
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2023
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- 2023-07-10 KR KR1020257013339A patent/KR20250099126A/ko active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020092434A (ja) * | 2015-01-30 | 2020-06-11 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | マシンタイプ通信(mtc)のためのランダムアクセス手順およびブロードキャスト優先度付け |
| JP2022178216A (ja) | 2021-05-19 | 2022-12-02 | 渡辺人形有限会社 | アクリル板製品の製造方法およびアクリル板 |
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| Title |
|---|
| ERICSSON: "New SID on Study on further NR RedCap UE complexity reduction", RP-213661, December 2021 (2021-12-01) |
| NTT DOCOMO: "Revised WID on New Radio Access Technology", RP-181726, September 2018 (2018-09-01) |
| PETER GAAL, QUALCOMM INCORPORATED: "UE complexity reduction for eRedCap", 3GPP DRAFT; R1-2212127; TYPE DISCUSSION; NR_REDCAP_ENH-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 5 November 2022 (2022-11-05), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052222690 * |
| See also references of EP4618683A1 |
| SHOTARO MAKI, PANASONIC: "UE complexity reduction for eRedCap", 3GPP DRAFT; R1-2211099; TYPE DISCUSSION; NR_REDCAP_ENH-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052221664 * |
| XIAOMI: "Discussion on further complexity reduction for eRedCap UEs", 3GPP DRAFT; R1-2209295, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20221010 - 20221019, 30 September 2022 (2022-09-30), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052277213 * |
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| Publication number | Publication date |
|---|---|
| KR20250099126A (ko) | 2025-07-01 |
| MX2025004119A (es) | 2025-05-02 |
| JPWO2024100924A1 (ja) | 2024-05-16 |
| EP4618683A4 (en) | 2026-02-25 |
| CN120153749A (zh) | 2025-06-13 |
| EP4618683A1 (en) | 2025-09-17 |
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