WO2024219190A1 - 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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- WO2024219190A1 WO2024219190A1 PCT/JP2024/012857 JP2024012857W WO2024219190A1 WO 2024219190 A1 WO2024219190 A1 WO 2024219190A1 JP 2024012857 W JP2024012857 W JP 2024012857W WO 2024219190 A1 WO2024219190 A1 WO 2024219190A1
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- resource
- muting
- resources
- terminal
- base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
-
- 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
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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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
Definitions
- This disclosure relates to a terminal, a base station, and a communication method.
- the 3rd Generation Partnership Project (3GPP) has completed the formulation of the physical layer specifications for Release 17 NR (New Radio access technology) as an extension of the functionality of 5th generation mobile communication systems (5G).
- NR will support enhanced mobile broadband (eMBB) to meet the requirements of high speed and large capacity, as well as functions that realize ultra-reliable and low latency communication (URLLC) (see, for example, non-patent literature 1-6).
- eMBB enhanced mobile broadband
- URLLC ultra-reliable and low latency communication
- 3GPP TS 38.211 V17.4.0 "NR; Physical channels and modulation (Release 17),” Jan. 2023 3GPP TS 38.212 V17.5.0, “NR; Multiplexing and channel coding (Release 17),” Mar. 2023 3GPP TS 38.213 V17.5.0, “NR; Physical layer procedure for control (Release 17),” Mar. 2023 3GPP TS 38.214 V17.5.0, “NR; Physical layer procedures for data (Release 17),” Mar. 2023 3GPP TS 38.215 V17.3.0, “NR; Physical layer measurements (Release 17),” Mar. 2023 3GPP TS 38.331 V17.4.0, “NR; Radio Resource Control (RRC) protocol specification (Release 17)", Mar. 2023
- RRC Radio Resource Control
- Non-limiting examples of the present disclosure contribute to providing a terminal, a base station, and a communication method that can appropriately measure interference between base stations.
- a terminal includes a control circuit that sets a second frequency resource that does not perform uplink transmission among first frequency resources that are assigned to uplink transmission in a certain time resource based on notification information, and a transmission circuit that performs the uplink transmission based on the second frequency resource.
- interference between base stations can be properly measured.
- Block diagram showing an example of a partial configuration of a terminal Block diagram showing a configuration example of a base station Block diagram showing an example of a terminal configuration
- FIG. 1 Figure showing an example of muting resource settings Figure showing an example of muting resource settings Figure showing an example of muting resource settings Figure showing an example of muting resource settings Figure showing an example of muting resource settings Figure showing an example of muting resource settings Figure showing an example of muting resource settings Figure showing an example of muting resource settings Diagram showing an example of muting resource settings Diagram showing an example of transmission power control for the Physical Uplink Shared Channel (PUSCH) Diagram showing an example of Demodulation Reference Signal (DMRS) allocation in Uplink Multi-User-Multiple Input Multiple Output (UL MU-MIMO) Diagram showing an example of an Xn interface between base stations Diagram of an example architecture for a 3GPP NR system Schematic diagram showing functional separation between NG-RAN (Next Generation - Radio Access Network) and 5GC (5th Generation Core) Sequence diagram of Radio Resource Control (RRC) connection setup/reconfiguration procedure Schematic diagram showing usage scenarios for enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), and Ultra Re
- SBFD subband non-overlapping full duplex
- TDD dynamic/flexible time division duplex
- Figure 1(a) shows an example of the operation of a base station (also called gNB) and a terminal (also called User Equipment: UE) (e.g., UE#1 and UE#2) in the same cell during SBFD operation.
- a base station also called gNB
- UE User Equipment
- Figure 1(a) shows an example of the operation of a base station (also called gNB) and a terminal (also called User Equipment: UE) (e.g., UE#1 and UE#2) in the same cell during SBFD operation.
- UE User Equipment
- Figure 1(b) shows an example of resource allocation in SBFD operation.
- the vertical axis represents frequency
- the horizontal axis represents time.
- "UL” represents uplink transmission
- "DL” represents downlink transmission.
- resources that are not used in each device e.g., gNB, UE#1, and UE#2 are shown with dotted lines.
- a frequency resource (frequency band) is divided into multiple subbands (also called bands, RB sets, subbands, or sub-BWPs (Bandwidth parts)), and transmission in different directions is supported on a subband-by-subband basis.
- a base station can transmit and receive simultaneously on the uplink and downlink (e.g., SBFD operation), and a terminal can transmit and receive on either the uplink or downlink in a given time resource (e.g., half-duplex operation).
- UE#1 communicates with the base station in the uplink
- UE#2 communicates with the base station in the downlink.
- Figure 2(a) shows an example of the operation of different base stations (e.g., gNB1 and gNB2) and terminals (e.g., UE#1 and UE#2) in dynamic/flexible TDD operation.
- base stations e.g., gNB1 and gNB2
- terminals e.g., UE#1 and UE#2
- dynamic/flexible TDD operation the base stations and terminals perform half-duplex operation, and the transmission directions may differ at different base stations.
- Figure 2(b) shows an example of resource allocation in dynamic/flexible TDD.
- gNG1 performs DL transmission to UE#1 and gNB2 performs UL reception from UE#2 in the same time resource (e.g., slot or symbol at the same time).
- CLI cross-link interference
- UE-to-UE terminals
- gNB-to-gNB base stations
- CLI cross-link interference
- the base station that causes interference will be referred to as the "aggressor gNB” and the base station that receives the interference will be referred to as the "victim gNB.”
- the base station performing UL reception may receive a CLI from the base station performing DL transmission (aggressor gNB in Figure 3), which may degrade the UL reception characteristics at the base station performing UL reception.
- One way to avoid such interference is for the victim gNB to measure the CLI between base stations, share the measurement results between base stations (e.g., between the aggressor gNB and the victim gNB), and avoid CLI between base stations through scheduling, etc.
- the aggressor gNB transmits a DL channel or signal for measurement, and the victim gNB receives the DL channel or signal and performs CLI measurement.
- information regarding the DL channel or signal for measurement may be shared in advance between base stations so that the victim gNB can know (or receive) the setting (configuration) of the aggressor gNB's DL channel or signal for measurement.
- the victim gNB may also receive a UL channel or signal from a terminal belonging to the victim gNB at the same time as receiving and measuring the DL channel or signal for measurement.
- the measured value of the CLI between base stations will include the UL channel or signal, and the victim gNB may not be able to accurately measure the CLI between base stations.
- the victim gNB configures a UL muting resource for a terminal (e.g., a terminal belonging to the victim gNB) on the same resource as at least one of the time resources and frequency resources (hereinafter referred to as time/frequency resources) on which the measurement DL channel or signal is allocated.
- the terminal belonging to the victim gNB for example, does not perform UL transmission on the configured UL muting resource. This enables the victim gNB to accurately measure the CLI measurement value between base stations excluding the influence from the UL, using the measurement DL channel or signal.
- Figure 4 shows an example of the use of UL muting resources.
- the aggressor gNB transmits a measurement DL channel or signal at symbols #9 and #10.
- a terminal belonging to the victim gNB is assigned a UL muting resource on the same resource as the measurement resource at the aggressor gNB.
- a terminal belonging to the victim gNB does not transmit uplink data (e.g., PUSCH: Physical Uplink Shared Channel) on the muting resource of symbols #9 and #10.
- the victim gNB receives a measurement DL channel or signal on the muting resource and measures the CLI between the base stations. This allows the victim gNB to use the measurement DL channel or signal to measure the CLI value between the base stations without the influence of the UL signal from the UE.
- muting resources are implicitly set by the base station's scheduling. For example, the base station schedules UL resources for the terminal, avoiding the resources to be muted. Therefore, information about muting resources is not notified to the terminal.
- the base station notifies the terminal of information (e.g., configuration) about the muting resources.
- the terminal sets (or identifies) the muting resources based on the notified information and does not assign UL channels or signals to the muting resources.
- the method of setting and notifying muting resources in a non-transparent scheme has not been fully considered.
- a method of setting and notifying muting resources in a non-transparent scheme is described.
- Figure 5 shows an example of measuring the CLI between base stations using muting resources.
- Figure 5(a) shows an example of resource (e.g., measurement resource) allocation for a DL channel or signal (e.g., a DL channel or signal for measurement) in an aggressor gNB.
- the DL channel or signal may be, for example, a Channel State Information - Reference Signal (CSI-RS).
- CSI-RS Channel State Information - Reference Signal
- the left side of Figure 5(a) shows allocation in resource block (RB) units, and the right side of Figure 5(a) shows allocation in resource element (RE) units.
- the right side of Figure 5(a) shows allocation in subcarrier units in the frequency domain.
- Figure 5(b) shows an example of RB-based allocation of UL resources (e.g., PUSCH resources) and muting resources in the victim gNB.
- Figure 5(c) shows an example of subcarrier-based (or RE-based) allocation of UL resources (e.g., PUSCH resources) and muting resources in the victim gNB.
- the RB-based and subcarrier-based muting resources mutes the measurement resource area of the aggressor gNB (e.g., does not use it for UL communication (PUSCH transmission)), so that the victim gNB can accurately measure the CLI between base stations using the measurement resource signal.
- the muting resources include resources that include resource elements that are unrelated to the measurement resources shown in FIG. 5(a). Therefore, UL communication may be muted even in resource elements that are unrelated to the measurement resources, which may reduce resource utilization efficiency.
- the resource elements related to the measurement resources shown in FIG. 5(a) are included in the muting resources, and resource elements unrelated to the measurement resources are not included in the muting resources. Therefore, resource elements unrelated to the measurement resources can be allocated to UL communications, improving resource utilization efficiency on a resource element basis.
- a method of notifying muting resources on a subcarrier basis is expected to improve the efficiency of resource utilization and allocation to PUSCH.
- a communication system may include, for example, a base station 100 (e.g., gNB) shown in Figures 6 and 8, and a terminal 200 (e.g., UE) shown in Figures 7 and 9.
- a base station 100 e.g., gNB
- a terminal 200 e.g., UE
- a plurality of base stations 100 and a plurality of terminals 200 may exist in the communication system.
- FIG. 6 is a block diagram showing an example of the configuration of a portion of a base station 100 according to one aspect of the present disclosure.
- a control unit e.g., corresponding to a control circuit
- sets a second frequency resource e.g., a muting resource
- a receiving unit e.g., corresponding to a receiving circuit
- FIG. 7 is a block diagram showing an example configuration of a portion of a terminal 200 according to one aspect of the present disclosure.
- a control unit e.g., corresponding to a control circuit
- sets a second frequency resource e.g., a muting resource
- a transmission unit e.g., corresponding to a transmission circuit
- [Base station configuration] 8 is a block diagram showing a configuration example of a base station 100 according to an embodiment of the present disclosure.
- the base station 100 includes a receiving unit 101, a demodulation/decoding unit 102, a muting resource setting unit 103, a scheduling unit 104, a control information holding unit 105, a data/control information generating unit 106, an encoding/modulation unit 107, and a transmitting unit 108.
- At least one of the demodulation/decoding unit 102, the muting resource setting unit 103, the scheduling unit 104, the control information holding unit 105, the data/control information generating unit 106, and the encoding/modulation unit 107 may be included in the control unit shown in FIG. 6, and the receiving unit 101 may be included in the receiving unit shown in FIG. 6.
- the receiving unit 101 performs reception processing, such as down-conversion or A/D conversion, on a received signal received via an antenna, and outputs the received signal after reception processing to the demodulation and decoding unit 102.
- reception processing such as down-conversion or A/D conversion
- the demodulation and decoding unit 102 demodulates and decodes the received signal input from the receiving unit 101, and outputs the decoded result to the scheduling unit 104.
- the muting resource setting unit 103 sets the muting resources. For example, the muting resource setting unit 103 may set the muting resources based on information from other base stations. For example, the muting resource setting unit 103 may set the muting resources based on control information (for example, configuration related to resources for inter-base station CLI measurement) input from the control information holding unit 105. The muting resource setting unit 103 outputs information related to the set muting resources (for example, allocation pattern of muting resources) to the scheduling unit 104.
- control information for example, configuration related to resources for inter-base station CLI measurement
- the scheduling unit 104 may, for example, perform scheduling for the terminals 200.
- the scheduling unit 104 schedules transmission and reception for each terminal 200 based on at least one of the decoding results input from the demodulation and decoding unit 102, the information on muting resource setting input from the muting resource setting unit 103, and the control information input from the control information holding unit 105, and instructs the data and control information generating unit 106 to generate at least one of data and control information.
- the control information holding unit 105 holds, for example, control information related to the configuration of measurement resources between base stations (e.g., allocation resources, etc.) and the configuration of muting resources (e.g., allocation patterns and notification methods, etc.).
- the control information holding unit 105 may output the held information to each component of the base station 100 (e.g., the muting resource setting unit 103 and the scheduling unit 104) as necessary.
- the data and control information generating unit 106 generates at least one of data and control information, for example, according to instructions from the scheduling unit 104, and outputs a signal including the generated data or control information to the coding and modulation unit 107.
- the generated data and control information may include at least one of upper layer signaling information and downlink control information, for example.
- the encoding and modulation unit 107 for example, encodes and modulates the signal input from the data and control information generation unit 106, and outputs the modulated signal to the transmission unit 108.
- the transmitting unit 108 performs transmission processing such as D/A conversion, up-conversion, or amplification on the signal input from the encoding/modulation unit 107, and transmits the radio signal obtained by the transmission processing from the antenna to the terminal 200.
- FIG. 9 is a block diagram showing a configuration example of a terminal 200 according to an aspect of the present disclosure.
- the terminal 200 includes a receiving unit 201, a demodulation and decoding unit 202, a muting resource setting unit 203, a transmission control unit 204, a control information holding unit 205, a data and control information generating unit 206, an encoding and modulation unit 207, and a transmitting unit 208.
- At least one of the demodulation/decoding unit 202, the muting resource setting unit 203, the transmission control unit 204, the control information storage unit 205, the data/control information generation unit 206, and the encoding/modulation unit 207 may be included in the control unit shown in FIG. 7, and the transmission unit 208 may be included in the transmission unit shown in FIG. 7.
- the receiving unit 201 performs reception processing, such as down-conversion or A/D conversion, on the received signal received via an antenna, and outputs the received signal after reception processing to the demodulation and decoding unit 202.
- reception processing such as down-conversion or A/D conversion
- the demodulation and decoding unit 202 demodulates and decodes the received signal input from the receiving unit 201, and outputs the decoded result to the transmission control unit 204.
- the muting resource setting unit 203 sets the muting resource based on the control information (e.g., information on the configuration of the muting resource) input from the control information holding unit 205.
- the muting resource setting unit 203 outputs, for example, information on the set muting resource to the transmission control unit 204.
- the transmission control unit 204 outputs the signaling information included in the decoding result input from the demodulation and decoding unit 202 to the control information holding unit 205.
- the transmission control unit 204 may also instruct the data and control information generating unit 206 to generate at least one of data and control information, based on, for example, setting information related to the muting resource input from the muting resource setting unit 103, control information input from the control information holding unit 205, or the decoding result input from the demodulation and decoding unit 202 (for example, downlink control information).
- the control information holding unit 205 holds, for example, control information (e.g., information relating to the configuration of muting resources) input from the transmission control unit 204, and outputs the held information to each component (e.g., the muting resource setting unit 203 and the transmission control unit 204) as necessary.
- control information e.g., information relating to the configuration of muting resources
- the data and control information generating unit 206 generates data or control information, for example, according to instructions from the transmission control unit 204.
- the data and control information generating unit 206 outputs a signal including the generated data or control information to the encoding and modulation unit 207.
- the encoding and modulation unit 207 for example, encodes and modulates the signal input from the data and control information generation unit 206, and outputs the modulated transmission signal to the transmission unit 208.
- the transmitting unit 208 performs transmission processing such as D/A conversion, up-conversion, or amplification on the signal input from the encoding/modulation unit 207, and transmits the radio signal obtained by the transmission processing from the antenna to the base station 100.
- FIG. 10 is a sequence diagram showing an example of the operation of the base station 100 and the terminal 200.
- the base station 100 determines the settings (configuration) related to the muting resources and the UL channel or signal (e.g., PUSCH) (S101). Note that the base station 100 may share the settings (configuration) of the measurement DL channel or signal of the aggressor gNB, for example, with other base stations (an example will be described later).
- the base station 100 may share the settings (configuration) of the measurement DL channel or signal of the aggressor gNB, for example, with other base stations (an example will be described later).
- the base station 100 transmits upper layer signaling information including the determined configuration to the terminal 200 (S102).
- the terminal 200 sets muting resources and PUSCH (e.g., UL resources) based on the configuration from the base station 100 (S103).
- muting resources and PUSCH e.g., UL resources
- the base station 100 transmits, for example, control information related to the PUSCH to the terminal 200 (S104).
- the control information may be transmitted, for example, using a downlink control channel (e.g., PDCCH: Physical Downlink Control Channel).
- PDCCH Physical Downlink Control Channel
- the terminal 200 receives the PDCCH and determines the allocation of muting resources and PUSCH resources based on the muting resource settings, the PUSCH settings, and the control information included in the received PDCCH (S105).
- the terminal 200 sets a muting resource that does not perform UL transmission among resources allocated to UL transmission (PUSCH) in a certain time resource.
- notification information from the base station 100 for example, at least one of higher layer signaling information and downlink control information
- the terminal 200 sets a muting resource that does not perform UL transmission among resources allocated to UL transmission (PUSCH) in a certain time resource.
- the terminal 200 transmits the PUSCH to the base station 100 based on the identified allocation of the muting resource and the PUSCH resource (S106). For example, the terminal 200 does not transmit the PUSCH in the muting resource among the allocated PUSCH resources.
- the base station 100 receives a PUSCH transmitted from the terminal 200, for example, based on the settings of the muting resources and the PUSCH resources.
- the base station 100 (for example, a victim gNB) may also measure the inter-base station CLI using a signal from the aggressor gNB, based on the settings of the muting resources.
- the measurement results of the inter-base station CLI may be shared, for example, by multiple base stations 100, and scheduling for the terminal 200 may be performed based on the measurement results of the inter-base station CLI.
- the base station 100 e.g., the muting resource setting unit 103 and the scheduling unit 104
- an example of the operation of the terminal 200 e.g., the muting resource setting unit 203 and the transmission control unit 204.
- the notification information used for setting the muting resources may be, for example, information on resources on a subcarrier basis.
- the configuration of muting resources e.g., configuration of muting resource patterns
- activation of muting resources e.g., enabling of muting resource configuration
- muting resource patterns e.g., multiple pattern candidates
- the setting may be enabled a specified number of times (e.g., once), or may be set repeatedly until it is disabled.
- the base station 100 uses RRC signaling or MAC signaling to configure a plurality of muting resource patterns (e.g., pattern candidates) in the terminal 200.
- RRC Radio Resource Control
- MAC Medium access control
- the base station 100 uses RRC signaling or MAC signaling to configure a plurality of muting resource patterns (e.g., pattern candidates) in the terminal 200.
- each of the plurality of muting resource patterns may be managed by identifiable information (e.g., an ID).
- the terminal 200 receives RRC signaling or MAC signaling, and determines the allocation of muting resources based on the configuration of the muting resources included in the RRC signaling or MAC signaling.
- a PDCCH e.g., a Group common PDCCH or a UE specific PDCCH
- the base station 100 may activate a specific muting resource pattern from among multiple muting resource patterns (pattern candidates) set by RRC signaling or MAC signaling by notifying the ID of the muting resource pattern using a channel such as the PDCCH.
- the base station 100 can activate the muting resource pattern for multiple terminals 200 at once. This makes it possible to conserve PDCCH resources.
- the base station 100 when activating a muting resource pattern using a UE specific PDCCH, the base station 100 can notify the terminal 200 of the activation of the muting resource pattern together with the scheduling of the PUSCH (e.g., PDCCH). Therefore, when there are few terminals 200 that notify muting resources, the resource utilization efficiency of the PDCCH can be improved.
- the PUSCH e.g., PDCCH
- the base station 100 configures the muting resource pattern in the terminal 200 by using the Group common PDCCH.
- the Group common PDCCH allows for a larger number of bits to be set compared to the UE specific PDCCH. Therefore, it is possible to directly set the muting resource configuration (for example, the bitmap format or reference signal resource configuration described below) using the Group common PDCCH.
- the terminal 200 determines the allocation of muting resources based on the muting resource configuration contained in the received Group common PDCCH.
- the Group common PDCCH allows for direct allocation of muting resources, it allows for dynamic configuration of muting resources, independent of the muting resource pattern that is set, in comparison with other configuration methods (e.g., methods using RRC signaling or MAC signaling).
- the base station 100 can also set multiple muting resource patterns (pattern candidates) using, for example, a Group common PDCCH, and activate a specific muting resource pattern from among the multiple muting resource patterns using a UE specific PDCCH.
- pattern candidates for example, a Group common PDCCH
- the base station 100 configures the muting resource pattern in the terminal 200 by using the UE specific PDCCH.
- the base station 100 assigns the muting resource to the terminal 200 by notifying the terminal 200 of the ID of the defined muting resource via the UE specific PDCCH. This is effective, for example, when the time and frequency resources for measuring the inter-base station CLI are defined to some extent (for example, when they are defined in the specification 9).
- the muting resource pattern setting is configured in a bitmap format.
- the base station 100 sets in the terminal 200 a "subcarrier bitmap" that indicates the subcarrier-based allocation pattern of the muting resource.
- the information notified from the base station 100 to the terminal 200 is information in a bitmap format that indicates whether each of the multiple subcarriers included in the transmission bandwidth of the terminal 200 is a muting resource or not.
- the terminal 200 for example, identifies the subcarriers to which the muting resource is assigned based on the set subcarrier bitmap.
- the subcarrier bitmap may be an array consisting of two values (“0" or "1") corresponding to the subcarriers.
- a subcarrier corresponding to a value of "1" in the subcarrier bitmap may be assigned as a muting resource, and a subcarrier corresponding to a value of "0" in the subcarrier bitmap may not be assigned as a muting resource. Note that the meanings of "0" and "1" (relationship to muting resources) may be reversed.
- Figure 11 shows an example of muting resource pattern settings.
- the subcarrier bitmap corresponds to the subcarriers in one resource block.
- the number of bits in the subcarrier bitmap (e.g., 12 bits) corresponds to the number of subcarriers in one resource block (e.g., 12 subcarriers).
- an allocation bandwidth may be set for the terminal 200.
- a "symbol bitmap" representing a symbol-by-symbol allocation pattern of muting resources may be set for terminal 200.
- the number of bits in the symbol bitmap (e.g., 14 bits) may correspond to the number of symbols in one slot (e.g., 14 symbols), or may correspond to the number of symbols in a time resource unit different from a slot.
- the terminal 200 when the subcarrier bitmap, symbol bitmap, and allocated bandwidth are set in the terminal 200, the terminal 200 sets (or identifies) muting resources based on these. In the example of FIG. 11, the terminal 200 sets, as muting resources, six subcarriers corresponding to the value "1" of the subcarrier bitmap in each of the resource blocks included in the allocated bandwidth of symbol #10.
- terminal 200 does not set subcarriers corresponding to the value "0" of the subcarrier bitmap as muting resources in each resource block included in the allocated bandwidth of symbol #10.
- Terminal 200 may set these subcarriers corresponding to the value "0" of the subcarrier bitmap as PUSCH resources.
- muting resources can be allocated in subcarrier (or resource element) units within a band allocated to terminal 200 (e.g., PUSCH resources).
- a band allocated to terminal 200 e.g., PUSCH resources.
- the base station 100 may also set a "resource block bitmap (RB bitmap)" representing the allocation pattern of the muting resources in resource block (RB) units to the terminal 200.
- RB bitmap resource block bitmap
- the terminal 200 identifies the subcarriers to which the muting resources are assigned, for example, based on the configured RB bitmap and subcarrier bitmap.
- the RB bitmap may be an array consisting of two values (“0" or "1") corresponding to the RB.
- an RB corresponding to a value of "1" in the RB bitmap may be assigned as a muting resource, and an RB corresponding to a value of "0" in the RB bitmap may not be assigned as a muting resource. Note that the meanings of "0" and "1" (relationship to muting resources) may be reversed.
- a subcarrier bitmap may be applied to an RB whose RB bitmap value is "1".
- the terminal 200 may set a subcarrier whose subcarrier bitmap value is "1" as a muting resource in an RB whose RB bitmap value is "1".
- Figure 12 shows an example of muting resource pattern settings.
- the RB bitmap corresponds to resource blocks within a certain bandwidth (e.g., allocated bandwidth).
- the subcarrier bitmap corresponds to the subcarriers in one resource block.
- the number of bits in the subcarrier bitmap (e.g., 12 bits) corresponds to the number of subcarriers in one resource block (e.g., 12 subcarriers).
- the terminal 200 sets (or identifies) muting resources based on these.
- the terminal 200 sets, as muting resources, six subcarriers corresponding to a value of "1" in the subcarrier bitmap in each of the RBs corresponding to a value of "1" in the RB bitmap of symbol #10.
- terminal 200 does not set the subcarriers corresponding to the value "0" of the subcarrier bitmap in the RBs of symbol #10 that correspond to the value "1" of the RB bitmap, and in the RBs of symbol #10 that correspond to the value "1" of the RB bitmap, as muting resources.
- Terminal 200 may set these RBs and subcarriers as PUSCH resources.
- muting resources can be allocated on an RB basis and a subcarrier (or resource element) basis. This allows terminal 200 to use resources corresponding to the value "0" in the RB bitmap and subcarrier bitmap for PUSCH transmission, for example, and makes it possible to simultaneously allocate PUSCH and muting resources in a certain symbol, thereby improving the efficiency of frequency resource usage.
- notification of muting resources in bitmap format enables flexible setting of various patterns of muting resources in both the frequency direction and the time direction, thereby improving the efficiency of PUSCH resource allocation.
- the number of bits in the subcarrier bitmap does not have to correspond to the number of subcarriers in one resource block.
- the number of bits in the subcarrier bitmap may correspond to the number of subcarriers included in multiple RBs.
- muting resources may be set by a 120-bit subcarrier bitmap that represents a muting resource pattern for 10 RBs (e.g., 120 subcarriers).
- one bit in the subcarrier bitmap corresponds to one subcarrier, but this is not limited thereto, and one bit may correspond to multiple subcarriers.
- one bit in the RB bitmap in Figure 12 may correspond to one or multiple RBs.
- one bit in the symbol bitmap in Figures 11 and 12 may correspond to one or multiple symbols.
- the notification of the muting resource is not limited to the notification in bitmap format.
- the start position of the resource e.g., at least one of the subcarriers, resource blocks, and symbols
- the resource size e.g., the number, size, or length of the subcarriers, resource blocks, or symbols
- the start position of the resource e.g., at least one of the subcarriers, resource blocks, and symbols
- the resource size e.g., the number, size, or length of the subcarriers, resource blocks, or symbols
- the muting resource may be set using a resource block bitmap, or may be set using a bitmap of a frequency resource unit different from the subcarrier and the resource block.
- the muting resource may be set based on a bitmap format and other parameters.
- the muting resource may be set using an offset of a resource block.
- the base station 100 notifies (or sets) the terminal 200 of, for example, the offset value of the resource block and information in a bitmap format (for example, a bitmap for at least one of a subcarrier, an RB, and a symbol).
- the offset value and information in a bitmap format may be notified to the terminal 200 by a group common PDCCH (for example, DCI format 2_4).
- the terminal 200 may set, for example, a band of the allocated band excluding the range from the reference RB position to the RB position offset based on the offset value as the setting target of the muting resource.
- the RB bitmap may be set for the RB corresponding to the band to which the muting resource is set.
- the muting resource setting is configured by reusing the resource configuration of the reference signal.
- the base station 100 sets the resource allocation configuration (e.g., allocation symbols or allocation bands, etc.) of the reference signal to the terminal 200.
- the information notified from the base station 100 to the terminal 200 is information indicating the allocation resource configuration of the reference signal.
- the terminal 200 for example, sets the muting resource based on the resource allocation configuration of the reference signal that has been set.
- the reference signal may be, for example, a Sounding Reference Signal (SRS), a Channel State Information Reference Signal (CSI-RS), or a Demodulation Reference Signal (DMRS).
- SRS Sounding Reference Signal
- CSI-RS Channel State Information Reference Signal
- DMRS Demodulation Reference Signal
- the resource configuration of existing reference signals can be flexibly set on a subcarrier-by-subcarrier basis using multiple parameters. For example, in the case of SRS, parameters such as comb and frequency hopping can be set. Therefore, in the configuration of muting resources that reuse the resource configuration of reference signals, flexible configuration of muting resources on a subcarrier-by-subcarrier basis becomes possible.
- the resource configuration or signaling e.g., SRS or CSI-RS trigger
- the resource configuration or signaling is reused, so that the RRC signaling and DCI overhead for muting resources can be reduced.
- muting resource setting is configured by reusing the resource configuration of the SRS.
- the base station 100 sets the SRS resource configuration in the terminal 200.
- the terminal 200 determines the allocation of muting resources based on the set SRS resource configuration.
- a muting resource (e.g., "muting resource”) may be set (e.g., newly added) in the "usage" of the SRS configuration (a parameter that defines the use of an SRS resource).
- An SRS resource with "usage” set to "muting resource” is used for allocating a muting resource.
- the terminal 200 identifies the allocation of a muting resource using an SRS resource configuration in which "usage" of the set SRS resource configuration is "muting resource”. For example, when "usage" is "muting resource”, the terminal 200 sets the allocated SRS resource to a muting resource and does not transmit SRS (mutes UL transmission).
- SRS resource allocation parameters e.g., comb and frequency hopping
- resource type e.g., resource behavior in the time domain, such as periodic, quasi-periodic, or aperiodic
- trigger method e.g., aperiodic SRS resources are triggered by DCI
- Figure 13 shows an example of a muting resource pattern that reuses the SRS resource configuration in configuration method 2-1. As shown in Figure 13, the muting resource is assigned using the SRS resource configuration.
- configuration method 2-1 since the existing SRS resource configuration or signaling is reused, there is no need to define many new RRC parameters for configuring muting resources. Also, for example, since the SRS trigger method can be reused for activating muting resources by DCI, there is no need to add a new field to DCI.
- muting resource settings are configured by reusing the resource configuration of the CSI-RS.
- the base station 100 sets the CSI-RS resource configuration in the terminal 200.
- the terminal 200 determines the allocation of muting resources based on the resource allocation of the set CSI-RS resource configuration.
- Figure 14 shows an example of a muting resource pattern configuration that reuses the CSI-RS resource configuration in configuration method 2-2.
- the CSI-RS resource configuration includes Code Division Multiplexing (CDM) patterns such as “no CDM”, “CDM2", “FD-CDM2", “CDM4" and “CDM8".
- CDM Code Division Multiplexing
- the CDM pattern is "CDM4" (for example, time multiplexing of two symbols (symbols #9 and #10 in FIG. 14) and frequency multiplexing of two subcarriers)
- a muting resource allocation is set that reuses the CSI-RS resource allocation that is periodically allocated in the frequency direction.
- the terminal 200 sets the allocated CSI-RS resource as a muting resource, and does not perform UL transmission in the muting resource (mutes it).
- CDM pattern reused for setting muting resources is not limited to "CDM4" and may be other CDM patterns.
- muting resources can be set more flexibly than in muting resource configuration that reuses SRS resource allocation.
- a CSI-RS configuration for muting resources is configured in the terminal 200, and the muting resources are configured using an existing CSI-RS triggering method.
- CSI-RS resource allocation parameters e.g., CDM pattern, etc.
- resource type e.g., resource behavior in the time domain, such as periodic, quasi-periodic, or aperiodic
- triggering method e.g., aperiodic CSI-RS resources are triggered by DCI
- the second method is to set the CSI-RS configuration for the muting resource within the SRS resource configuration, and the SRS resource configuration is set in the terminal 200.
- “muting resource” may be set to "usage" of the SRS resource configuration.
- This makes it possible to reuse the SRS trigger method and assign muting resources using the CSI-RS resource configuration. Since this method reuses the existing CSI-RS resource configuration and signaling, it is not necessary to define many new RRC parameters for the muting resource.
- the SRS trigger method can be reused for activating the muting resource by DCI, it is not necessary to add a new field to the DCI.
- the muting resource setting is configured by reusing the resource configuration of the DMRS.
- the base station 100 sets the DMRS resource configuration in the terminal 200. For example, the base station 100 sets at least a part of the resources set by the DMRS resource configuration as muting resources.
- the terminal 200 determines the allocation of the muting resources based on the set DMRS resource configuration.
- Figure 15 shows an example of a muting resource pattern configuration that reuses the DMRS resource configuration in configuration method 2-3.
- the DMRS resource configuration is a configuration in which DMRS is assigned to symbols #2, #7, and #11 in a single-symbol DMRS.
- a configuration that sets the DMRS of symbol #7 as a muting resource is defined within the DMRS configuration.
- the DMRS resource of symbol #7 is assigned as a muting resource. Therefore, in Figure 15, no DMRS is placed in symbol #7.
- terminal 200 sets the resource of symbol #7 of the assigned DMRS resources as a muting resource, and does not transmit DMRS in the muting resource (for example, mutes UL transmission).
- configuration method 2-3 the resource configuration and signaling of the existing DMRS are reused, so there is no need to define many new RRC parameters for the muting resource.
- the resource configuration of the DMRS is not limited to the example shown in FIG. 15, and for example, the number of symbols, symbol positions, number of subcarriers, and subcarrier positions in which the DMRS is arranged may be other values. Also, in FIG. 15, a case has been described in which a muting resource is set to one of the symbols set by the resource configuration of the DMRS, but this is not limited thereto, and the muting resource may be set to multiple symbols in which the DMRS is set.
- the configuration defined in the DMRS resource configuration for setting the DMRS as a muting resource is not limited to the example shown in FIG. 15.
- FIG. 15 a case has been described in which all subcarriers assigned to the DMRS are assigned as muting resources in some symbols among the multiple symbols in which the DMRS is placed, but the assignment of muting resources is not limited to this.
- some subcarriers to which the DMRS is assigned may be assigned as muting resources in some symbols among the multiple symbols in which the DMRS is placed.
- some subcarriers to which the DMRS is assigned may be assigned as muting resources in some subcarriers among the multiple subcarriers to which the DMRS is assigned.
- the terminal 200 sets a muting resource in a PUSCH resource in a certain symbol based on notification information (e.g., resource information on a subcarrier basis) from the base station 100, and performs UL transmission based on the muting resource.
- the muting resource is allocated together with the PUSCH by at least one of semi-static and dynamic notification, for example. This makes it possible to allocate the muting resource and the PUSCH resource simultaneously, and to allocate the muting resource while avoiding resource collisions. Therefore, according to this embodiment, the muting resource can be set with improved resource utilization efficiency, and interference between base stations can be appropriately measured.
- the configurations of base station 100 and terminal 200 may be the same as those in embodiment 1.
- the configuration and activation of the muting resource pattern in this embodiment may be the same as those in embodiment 1.
- the method of setting the muting resource is different from that in embodiment 1.
- the muting resource configuration method according to the present embodiment is a PUSCH resource reduction (or reduction) or shift-based configuration method.
- the muting resource is set, for example, by reducing the PUSCH allocation resource (e.g., resource block or symbol) or shifting the PUSCH allocation resource.
- the base station 100 sets, for example, parameters of the resource blocks or symbols to be reduced or shifted in the terminal 200.
- the terminal 200 changes (reduces or shifts) the PUSCH allocation based on the set parameters, for example, and sets the resources vacated by the reduction or shift of the PUSCH allocation as muting resources.
- the resource block shift parameter is set to 2 RBs.
- the transmission bandwidth of the PUSCH is reduced or shifted by two resource blocks. Due to the reduction or shifting of the PUSCH resources, no resources are assigned to the two resource blocks. These free resources are set (or reserved) as muting resources.
- Figure 16 shows an example of PUSCH shrinking and shift-based muting resource configuration in the frequency domain.
- FIG. 16(a) shows an example of setting muting resources by reducing the transmission bandwidth of the PUSCH.
- the transmission bandwidth of the PUSCH is reduced by two resource blocks (e.g., two resource blocks of RB#0 and RB#1), and muting resources are set in the two resource blocks that become free due to the reduction in the transmission bandwidth of the PUSCH.
- FIG. 16(b) shows an example of setting muting resources by shifting the transmission bandwidth of the PUSCH.
- the transmission bandwidth of the PUSCH is shifted by two resource blocks, and muting resources are set in the two resource blocks (e.g., RB#0 and RB#1) that become vacant due to the shift in the transmission bandwidth of the PUSCH.
- muting resources are secured by reducing or shifting the PUSCH transmission band.
- some or all of the symbols (e.g., 14 symbols) assigned to the PUSCH (symbols #8 to #11 in the example of Figures 16(a) and 16(b)) may be set as muting resources. Parameters of the symbols set as muting resources (e.g., parameters related to the number of symbols and symbol positions) may be notified to terminal 200.
- the terminal 200 sets a muting resource in a PUSCH resource in a certain symbol based on notification information from the base station 100 (e.g., parameters of a resource block or symbol to be reduced or shifted), and performs UL transmission based on the muting resource.
- the muting resource is allocated together with the PUSCH by at least one of semi-static and dynamic notification. This makes it possible to allocate the muting resource and the PUSCH resource simultaneously, and to allocate the muting resource while avoiding resource collisions. Therefore, according to this embodiment, the muting resource can be set with improved resource utilization efficiency, and interference between base stations can be appropriately measured.
- the PUSCH resource is reduced or shifted in the frequency direction (or the frequency resource is changed in the same way across multiple symbols), so that the transmission power (e.g., the total power or power spectral density (PSD: Power Spectral Density) in the symbol) does not change between the symbol to which the muting resource is set (e.g., symbols #8 to #11 in FIG. 16) and the symbol to which the muting resource is not set (e.g., symbols other than symbols #8 to #11 in FIG. 16). Therefore, the terminal 200 does not need to perform new PUSCH transmission power control (e.g., PUSCH transmission power boost, etc.) for allocating the muting resource, which prevents the design of the terminal 200 from becoming complicated.
- the transmission power e.g., the total power or power spectral density (PSD: Power Spectral Density
- PSD Power Spectral Density
- muting resources can be assigned to configured grant (CG) PUSCH without dynamic grant (DG) PUSCH.
- CG configured grant
- DG dynamic grant
- the allocation of the CG PUSCH that overlaps with the CLI measurement of the base station 100 can be changed using parameters related to the shrinking or shifting resource blocks and symbols. This can also be achieved by changing the allocation of the PUSCH using the DG PUSCH, but in this embodiment, muting resources and CG PUSCH can be assigned without dynamic grant scheduling.
- the muting resource may be set by applying both a reduction and a shift of the PUSCH resource (transmission band).
- the PUSCH resource is reduced across all symbols to which the PUSCH is assigned, but this is not limited thereto.
- the PUSCH resource e.g., RB
- the PUSCH resource may be reduced in a symbol set as a muting resource, and the PUSCH resource may not be reduced in a symbol not set as a muting resource. This can reduce the reduction of the PUSCH resource and improve the resource utilization efficiency.
- the transmission power between symbols (for example, the total power or PSD in the symbol) changes between a symbol to which the muting resource is allocated and a symbol to which the muting resource is not allocated.
- FIG. 17(a) shows an example of allocation of muting resources according to embodiment 1.
- base station 100 allocates muting resources to symbol #10.
- FIG. 17(b), FIG. 17(c), and FIG. 17(d) are diagrams comparing PSDs in the muting resource settings shown in FIG. 17(a).
- FIG. 17(b) shows an example of PSD for a symbol to which no muting resources are allocated
- FIG. 17(c) and FIG. 17(d) show an example of PSD for a symbol to which a muting resource is allocated (e.g., symbol #10 shown in FIG. 17(a)).
- Method 1 Matching transmission power between symbols>
- the transmission power between symbols is adjusted between a symbol to which a muting resource is not assigned and a symbol to which a muting resource is assigned. For example, in a symbol to which a muting resource is assigned, since PUSCH is not transmitted in some resources (e.g., subcarriers), the transmission power of PUSCH may be boosted. For example, as shown in FIG. 17(c), the transmission power of PUSCH is boosted, so that the total transmission power becomes the same as that of a symbol to which a muting resource is not assigned as shown in FIG. 17(b).
- a transit period e.g., an adjustment period for transmission power fluctuation
- Method 2 Matching PSD between symbols>
- the PSD between symbols is matched between symbols to which muting resources are not assigned and symbols to which muting resources are assigned.
- the transmission power of the PUSCH is not boosted.
- the PSD of a symbol to which a muting resource is assigned is the same as the PSD of a symbol to which a muting resource is not assigned as shown in FIG. 17(b).
- the PSD between symbols is the same in PUSCH transmission, so the PAPR (Peak-to-Average Power Ratio) requirement does not increase.
- PAPR Peak-to-Average Power Ratio
- the PUSCH transmission power control (transmission power boost) in method 1 can reuse the DMRS power boost in UL MU-MIMO (Multi-User-Multiple Input Multiple Output).
- Figure 18(a) shows an example of DMRS allocation in UL MU-MIMO
- Figure 18(b) shows an example of DMRS allocation as viewed from each terminal 200 (e.g., UE#1, UE#2, and UE#3).
- CDM group ⁇ 0,1,2 ⁇ is set, the DMRS port of CDM group ⁇ 0 ⁇ is assigned to UE#1, the DMRS port of CDM group ⁇ 1 ⁇ is assigned to UE#2, and the DMRS port of CDM group ⁇ 2 ⁇ is assigned to UE#3.
- UE#1 is assigned the DMRS port of CDM group ⁇ 0 ⁇ , and the other CDM groups ⁇ 1, 2 ⁇ are assigned to other terminals (UE#2 and UE#3), so UE#1 does not assign anything to the resources corresponding to CDM group ⁇ 1, 2 ⁇ (e.g., does not assign PUSCH or DMRS, etc.).
- UE#1 may boost the transmission power of the resources corresponding to CDM group ⁇ 0 ⁇ related to resources to which DMRS is not assigned (e.g., resources corresponding to CDM group ⁇ 1, 2 ⁇ ). Transmission power control may be performed similarly for UE#2 and UE#3.
- the CLI measurement between base stations information sharing between the aggressor gNB and the victim gNB is expected.
- the measurement resource of the aggressor gNB may be shared in advance, or the CLI measurement value between base stations may be shared after the measurement.
- Information sharing between base stations may be performed using the Xn interface, for example, as shown in FIG. 19.
- a muting resource setting method using a resource configuration of a reference signal in a UL muting resource notification method has been described.
- the configuration of a reference signal (e.g., CSI-RS, SRS, DMRS, etc.) may be shared between an aggressor gNB and a victim gNB using an Xn interface between base stations.
- CSI-RS configuration e.g., ZP-CSI-RS-Resource, ZP-CSI-RS-ResourceSet, NZP-CSI-RS-Resource, NZP-CSI-RS-ResourceSet, and CSI-RS-ResourceMapping, etc.
- SRS configuration e.g., SRS-ResourceSet and SRS-Resource, etc.
- DMRS configuration e.g., DMRS-UplinkConfig
- both transparent and non-transparent schemes can be applied to the notification of UL muting resources.
- the CSI-RS configuration used for inter-base station CLI measurements at the aggressor gNB is shared with the victim gNB using the Xn interface, and the victim gNB can configure UL muting resources using the shared CSI-RS configuration (for example, configuration according to configuration method 2-2 in embodiment 1).
- base station 100 can allocate muting resources using that configuration.
- the parameters used in the above-described embodiment such as the number, position, and pattern of resources (number of subcarriers, number of RBs, or number of symbols) to which muting resources are set, are merely examples and are not limiting.
- the units in which the muting resources are set in the frequency domain are described as subcarrier units or resource block units, but the units of the frequency resources in which the muting resources are set are not limited to these and may be other units.
- the units in which the muting resources are set in the time domain are described as symbol units, but the units of the time resources in which the muting resources are set are not limited to these and may be other units.
- the setting of muting resources for the uplink has been described, but this is not limited thereto, and the muting resources may be set for other links such as the downlink or sidelink.
- PUSCH transmission has been described as an example of UL transmission, but the UL channel or signal is not limited to PUSCH and may be another channel or signal.
- muting may be replaced with other names such as rate matching, blanking, and puncture.
- (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 the above-described embodiments.
- 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.
- the base station 100 may control the setting of muting resources 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 meaning 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.
- Information regarding the capabilities or limitations of terminal 200 may be defined in a standard, for example, or may be implicitly notified to base station 100 in association with information already known at base station 100 or information transmitted to 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 uplink control signal (or uplink control information) related to one embodiment of the present disclosure may be, for example, a signal (or information) transmitted in a PUCCH in the physical layer, or a signal (or information) transmitted in a MAC CE or RRC in a higher layer.
- the signal (or information) is not limited to being notified by an uplink control signal, but may be predefined in a specification (or standard), or may be preconfigured in a base station and a terminal.
- the uplink control signal may be replaced with, for example, uplink control information (UCI), 1st stage sidelink control information (SCI), or 2nd stage SCI.
- UCI uplink control information
- SCI 1st stage sidelink control information
- 2nd stage SCI 2nd stage SCI.
- 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 mobile station, and may be called 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 Access (SC-FDMA) symbol, or another time resource unit.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier-Frequency Division Multiplexing Access
- 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 either a licensed band or an unlicensed band.
- 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 channel in an embodiment of the present disclosure may be replaced with any of PSCCH, PSSCH, Physical Sidelink Feedback Channel (PSFCH), PSBCH, PDCCH, PUCCH, PDSCH, PUSCH, and PBCH.
- 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 that 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 for multiplying the weighting of a precoding vector.
- 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 20 (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 TS 38.300, section 6.4)) sublayer, the RLC (Radio Link Control (see TS 38.300, section 6.3)) sublayer, and the MAC (Medium Access Control (see 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
- a new Access Stratum (AS) sublayer SDAP: Service Data Adaptation Protocol
- SDAP Service Data Adaptation Protocol
- a control plane protocol stack has also been 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 the data rates provided 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 21 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 the 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: – the 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 22 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 sends an RRCReconfiguration message to the UE, and upon receiving an RRCReconfigurationComplete from the UE, the gNB performs reconfiguration to set up Signaling Radio Bearer 2 (SRB2) and Data Radio Bearer (DRB). For signaling-only connections, the RRCReconfiguration steps are omitted, since SRB2 and DRB are not set up. Finally, the gNB notifies the AMF that the setup procedure is complete with an INITIAL CONTEXT SETUP RESPONSE.
- SRB2 Signaling Radio Bearer 2
- DRB Data Radio Bearer
- 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 23 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 23 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 and 0.5 ms for DL.
- 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 stringent requirements are envisaged, such as factory automation, transportation and power distribution, with 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 the order of 0.5 ms to 1 ms (e.g. 0.5 ms latency on the targeted user plane).
- 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 the order of 0.5 ms to 1 ms (e.g. 0.5 ms latency on 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 22. 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 24 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 23
- NEF Network Exposure Function
- PCF Policy Control Function
- Figure 24 further shows 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.
- Each functional block used in the description of the above embodiments may be realized, in part or in whole, as an LSI, which is an integrated circuit, and each process described in the above embodiments may be controlled, in part or in whole, by one LSI or a combination of LSIs.
- the LSI may be composed of individual chips, or may be composed of one chip that contains some or all of the functional blocks.
- the LSI may have data input and output. Depending on the degree of integration, the LSI may be called an IC, system LSI, super LSI, or ultra LSI.
- the integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, 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.
- 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 control circuit that sets a second frequency resource that does not perform uplink transmission among first frequency resources that are assigned to uplink transmission in a certain time resource based on notification information, and a transmission circuit that performs the uplink transmission based on the second frequency resource.
- the notification information is information regarding resources on a subcarrier basis.
- the notification information is information in a bitmap format indicating whether each of a plurality of subcarriers included in the first frequency resource is the second frequency resource.
- the notification information is information indicating the allocation resource setting of the reference signal.
- control circuit sets the second frequency resource by reducing or shifting the first frequency resource.
- a base station includes a control circuit that sets a second frequency resource that does not perform uplink transmission among first frequency resources that are assigned to uplink transmission in a certain time resource, and a receiving circuit that performs uplink reception based on the second frequency resource.
- a terminal sets a second frequency resource that is not used for uplink transmission among first frequency resources that are assigned to uplink transmission in a certain time resource based on notification information, and performs the uplink transmission based on the second frequency resource.
- a base station sets a second frequency resource that is not used for uplink transmission among first frequency resources that are assigned to uplink transmission in a certain time resource, and performs uplink reception based on the second frequency resource.
- An embodiment of the present disclosure is useful in wireless communication systems.
- Base station 101 201 Receiving section 102, 202 Demodulation and decoding section 103, 203 Muting resource setting section 104 Scheduling section 105, 205 Control information storage section 106, 206 Data and control information generating section 107, 207 Coding and modulation section 108, 208 Transmitting section 200 Terminal 204 Transmission control section
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Abstract
Description
Release 18において、subband non-overlapping full duplex(SBFD)及びDynamic/flexible TDDが議論されている。図1はSBFDの例を示し、図2はDynamic/flexible TDDの例を示す。
Dynamic/flexible TDDオペレーションの場合、様々な干渉が発生し得る。例えば、端末間(UE-to-UE)におけるクロスリンク干渉(CLI:Cross-Link Interference)、及び、基地局間(gNB-to-gNB)におけるCLIが発生し得る。端末間のCLI及び基地局間のCLIは、受信特性を大きく劣化させるため、対応策が求められている。
基地局間のCLIの測定方法について説明する。
一例として、サブキャリア単位のミューティングリソースの割り当てについて説明する。
[通信システムの概要]
本開示の一態様に係る通信システムは、例えば、図6及び図8に示す基地局100(例えば、gNB)、及び、図7及び図9に示す端末200(例えば、UE)を備えてよい。基地局100及び端末200は、それぞれ、通信システムにおいて複数台存在してもよい。
図8は、本開示の一態様に係る基地局100の構成例を示すブロック図である。図8において、基地局100は、受信部101と、復調・復号部102と、ミューティングリソース設定部103と、スケジューリング部104と、制御情報保持部105と、データ・制御情報生成部106と、符号化・変調部107と、送信部108と、を有する。
図9は、本開示の一態様に係る端末200の構成例を示すブロック図である。図9において、端末200は、受信部201と、復調・復号部202と、ミューティングリソース設定部203と、送信制御部204と、制御情報保持部205と、データ・制御情報生成部206と、符号化・変調部207と、送信部208と、を有する。
以上の構成を有する基地局100及び端末200における動作例について説明する。
次に、本開示の非限定的な一実施例に係るミューティングリソースの設定方法、及び、通知方法の例について説明する。
基地局100は、RRCシグナリング又はMACシグナリングを用いて、複数のミューティングリソースパターン(例えば、パターンの候補)を端末200に設定(コンフィグレーション)する。例えば、複数のミューティングリソースパターンのそれぞれは識別可能な情報(例えば、ID)によって管理されてもよい。
基地局100は、Group common PDCCHを用いて、ミューティングリソースパターンを端末200に設定(コンフィグレーション)する。
基地局100は、UE specific PDCCHを用いて、ミューティングリソースパターンを端末200に設定(コンフィグレーション)する。
設定方法1では、ミューティングリソースパターンの設定は、ビットマップ形式で構成される。
設定方法2では、ミューティングリソースの設定は、参照信号のリソースコンフィグレーションを再利用して構成される。
設定方法2-1では、ミューティングリソースの設定は、SRSのリソースコンフィグレーションを再利用して構成される。
設定方法2―2では、ミューティングリソースの設定は、CSI-RSのリソースコンフィグレーションを再利用して構成される。
設定方法2-3では、ミューティングリソースの設定は、DMRSのリソースコンフィグレーションを再利用して構成される。
本実施の形態において、基地局100及び端末200の構成は、実施の形態1と同様の構成でよい。また、本実施の形態におけるミューティングリソースパターンのコンフィグレーション及びアクティベーションは、実施の形態1と同様でよい。本実施の形態では、ミューティングリソースの設定方法が実施の形態1と異なる。
本実施の形態に係るミューティングリソースの設定方法は、PUSCHリソースの縮小(又は、削減)、又は、シフトベースの設定方法である。
[シンボル間のPUSCH送信電力]
実施の形態1に係るミューティングリソースの設定では、ミューティングリソースが割り当てられるシンボルとミューティングリソースが割り当てられないシンボルとで、シンボル間の送信電力(例えば、シンボルにおける総電力又はPSD)が変化する。
方法1では、ミューティングリソースが割り当てられないシンボルとミューティングリソースが割り当てられるシンボルとで、シンボル間の送信電力を合わせる。例えば、ミューティングリソースが割り当てられるシンボルでは、一部のリソース(例えば、サブキャリア)においてPUSCHが送信されないので、PUSCHの送信電力がブーストされてもよい。例えば、図17(c)に示すように、PUSCHの送信電力がブーストされることにより、図17(b)に示すミューティングリソースが割り当てられないシンボルと総送信電力が同じになる。方法1では、シンボル間の送信電力が同じであるため、トランジット期間(例えば、送信電力変動のための調整期間)は設定されなくてもよい。
方法2では、ミューティングリソースが割り当てられないシンボルとミューティングリソースが割り当てられるシンボルとで、シンボル間のPSDを合わせる。例えば、方法2では、PUSCHの送信電力ブーストは行われない。例えば、図17(d)に示すように、ミューティングリソースが割り当てられるシンボルのPSDは、図17(b)に示すミューティングリソースが割り当てられないシンボルのPSDと同じになる。方法2では、PUSCH送信において、シンボル間のPSDが同じであるため、PAPR(Peak-to-Average Power Ratio)要求が増加しない。
基地局間のCLI測定において、aggressor gNBとvictim gNBとの間の情報の共有が期待される。例えば、aggressor gNBの測定リソースの事前の共有、又は、測定後の基地局間CLI測定値の共有が挙げられる。基地局間の情報共有は、例えば、図19に示すように、Xnインターフェースを用いて行われてもよい。
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、基地局及び移動局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 Access(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のいずれに適用してもよい。
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チャネルをPSCCH、PSSCH、Physical Sidelink Feedback Channel(PSFCH)、PSBCH、PDCCH、PUCCH、PDSCH、PUSCH、又は、PBCH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、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21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22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23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23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インター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。
101,201 受信部
102,202 復調・復号部
103 ,203ミューティングリソース設定部
104 スケジューリング部
105,205 制御情報保持部
106,206 データ・制御情報生成部
107,207 符号化・変調部
108,208 送信部
200 端末
204 送信制御部
Claims (8)
- 通知情報に基づいて、或る時間リソースにおいて上りリンク送信に割り当てられる第1の周波数リソースのうち、前記上りリンク送信を行わない第2の周波数リソースを設定する制御回路と、
前記第2の周波数リソースに基づいて、前記上りリンク送信を行う送信回路と、
を具備する端末。 - 前記通知情報は、サブキャリア単位のリソースに関する情報である、
請求項1に記載の端末。 - 前記通知情報は、前記第1の周波数リソースに含まれる複数のサブキャリアのそれぞれが前記第2の周波数リソースであるか否かを示すビットマップ形式の情報である、
請求項2に記載の端末。 - 前記通知情報は、参照信号の割り当てリソース設定を示す情報である、
請求項2に記載の端末。 - 前記制御回路は、前記第1の周波数リソースの削減又はシフトによって、前記第2の周波数リソースを設定する、
請求項1に記載の端末。 - 或る時間リソースにおいて上りリンク送信に割り当てられる第1の周波数リソースのうち、前記上りリンク送信を行わない第2の周波数リソースを設定する制御回路と、
前記第2の周波数リソースに基づいて、上りリンク受信を行う受信回路と、
を具備する基地局。 - 端末は、
通知情報に基づいて、或る時間リソースにおいて上りリンク送信に割り当てられる第1の周波数リソースのうち、前記上りリンク送信を行わない第2の周波数リソースを設定し、
前記第2の周波数リソースに基づいて、前記上りリンク送信を行う、
通信方法。 - 基地局は、
或る時間リソースにおいて上りリンク送信に割り当てられる第1の周波数リソースのうち、前記上りリンク送信を行わない第2の周波数リソースを設定し、
前記第2の周波数リソースに基づいて、上りリンク受信を行う、
通信方法。
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Non-Patent Citations (2)
| Title |
|---|
| TOMOHIRO INOUE, PANASONIC: "Discussion on potential enhancements on dynamic/flexible TDD", 3GPP DRAFT; R1-2303167; TYPE DISCUSSION; FS_NR_DUPLEX_EVO, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Online; 20230417 - 20230426, 7 April 2023 (2023-04-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052293734 * |
| YAN CHENG, HUAWEI, HISILICON: "Study on potential enhancements on dynamic/flexible TDD", 3GPP DRAFT; R1-2210878; TYPE DISCUSSION; FS_NR_DUPLEX_EVO, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052221441 * |
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