WO2022185499A1 - 端末、基地局、無線通信システム及び無線通信方法 - Google Patents
端末、基地局、無線通信システム及び無線通信方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/20—Negotiating bandwidth
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
Definitions
- the present disclosure relates to terminals, base stations, wireless communication systems, and wireless communication methods that perform wireless communication, particularly terminals, base stations, and wireless communication that perform communication in a CBW (Channel Bandwidth) set by a base station for a terminal. It relates to systems and wireless communication methods.
- CBW Channel Bandwidth
- the 3rd Generation Partnership Project (3GPP) has specified the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and the next generation specification called Beyond 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G
- FR Frequency Range
- 60kHz and 120kHz SCS are assumed in FR2 (for example, Non-Patent Document 1).
- the present invention has been made in view of such circumstances, and aims to provide a terminal, a base station, a wireless communication system, and a wireless communication method that can improve frequency utilization efficiency.
- the present disclosure is a terminal, and when the base station sets a wideband carrier bandwidth wider than the maximum carrier bandwidth supported by the terminal, the base station assumes that the terminal uses the wideband carrier bandwidth
- the gist of the present invention is to provide a control unit that performs communication in which the number of second frequency resources, which is larger than the number of available first frequency resources, can be used.
- the present disclosure is a base station, and when the base station sets a wideband carrier bandwidth wider than the maximum carrier bandwidth supported by a terminal, the base station assumes that the terminal uses the wideband carrier bandwidth.
- a control unit that performs communication capable of using a second number of frequency resources that is larger than the number of first frequency resources that can be used.
- the present disclosure is a wireless communication system comprising a terminal and a base station, wherein the terminal and the base station set a broadband carrier bandwidth wider than the maximum carrier bandwidth supported by the terminal.
- WHEREIN On the assumption that the terminal uses the wideband carrier bandwidth, a control unit that executes communication that can use a second number of frequency resources that is larger than the number of first frequency resources that the base station can use, This is the gist of it.
- the present disclosure relates to a wireless communication method, in which, when a base station sets a wideband carrier bandwidth wider than the maximum carrier bandwidth supported by a terminal, the base station assumes that the terminal uses the wideband carrier bandwidth.
- the gist of the matter comprises performing communications in which a station can utilize a second number of frequency resources that is greater than the first number of frequency resources available.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10.
- FIG. 2 is a diagram illustrating frequency ranges used in wireless communication system 10.
- FIG. 3 is a diagram showing a configuration example of radio frames, subframes and slots used in the radio communication system 10.
- FIG. 4 is a functional block configuration diagram of UE200.
- FIG. 5 is a functional block configuration diagram of gNB100.
- FIG. 6 is a diagram for explaining the background.
- FIG. 7 is a diagram for explaining the existing technology.
- FIG. 8 is a diagram for explaining the existing technology.
- FIG. 9 is a diagram for explaining application scenes.
- FIG. 10 is a diagram showing an example of the hardware configuration of gNB100 and UE200.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10 according to an embodiment.
- the radio communication system 10 is a radio communication system according to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter NG-RAN 20 and a terminal 200 (hereinafter UE 200).
- NR 5G New Radio
- NG-RAN 20 Next Generation-Radio Access Network
- UE 200 terminal 200
- the wireless communication system 10 may be a wireless communication system according to a system called Beyond 5G, 5G Evolution, or 6G.
- NG-RAN 20 includes a radio base station 100A (hereinafter gNB100A) and a radio base station 100B (hereinafter gNB100B).
- gNB100A radio base station 100A
- gNB100B radio base station 100B
- the specific configuration of the radio communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG.
- NG-RAN 20 actually includes multiple NG-RAN Nodes, specifically gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). Note that NG-RAN 20 and 5GC may simply be referred to as a "network”.
- gNBs or ng-eNBs
- 5GC 5G-compliant core network
- gNB100A and gNB100B are 5G-compliant radio base stations and perform 5G-compliant radio communication with UE200.
- gNB100A, gNB100B and UE200 generate BM beams with higher directivity by controlling radio signals transmitted from multiple antenna elements Massive MIMO (Multiple-Input Multiple-Output), multiple component carriers (CC ), and dual connectivity (DC) that simultaneously communicates with two or more transport blocks between the UE and each of the two NG-RAN Nodes.
- Massive MIMO Multiple-Input Multiple-Output
- CC multiple component carriers
- DC dual connectivity
- the wireless communication system 10 supports multiple frequency ranges (FR).
- FIG. 2 shows the frequency ranges used in wireless communication system 10. As shown in FIG.
- the wireless communication system 10 supports FR1 and FR2.
- the frequency bands of each FR are as follows.
- FR1 410MHz to 7.125GHz
- FR2 24.25 GHz to 52.6 GHz
- SCS Sub-Carrier Spacing
- BW bandwidth
- FR2 is higher frequency than FR1 and may use an SCS of 60 or 120 kHz (240 kHz may be included) and a bandwidth (BW) of 50-400 MHz.
- SCS may be interpreted as numerology.
- numerology is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.
- the wireless communication system 10 also supports frequency bands higher than the FR2 frequency band. Specifically, the wireless communication system 10 supports frequency bands above 52.6 GHz and up to 71 GHz or 114.25 GHz. Such high frequency bands may be conveniently referred to as "FR2x".
- Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM)/ Discrete Fourier Transform - Spread (DFT-S-OFDM) may be applied.
- FIG. 3 shows a configuration example of radio frames, subframes and slots used in the radio communication system 10.
- one slot consists of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period).
- the SCS is not limited to the intervals (frequencies) shown in FIG. For example, 480 kHz, 960 kHz, etc. may be used.
- the number of symbols forming one slot does not necessarily have to be 14 symbols (for example, 28 or 56 symbols). Furthermore, the number of slots per subframe may vary between SCSs.
- time direction (t) shown in FIG. 3 may be called the time domain, symbol period, symbol time, or the like.
- the frequency direction may be called a frequency domain, resource block, subcarrier, bandwidth part (BWP), or the like.
- DMRS is a type of reference signal and is prepared for various channels.
- it may mean a downlink data channel, specifically DMRS for PDSCH (Physical Downlink Shared Channel).
- DMRS for PDSCH Physical Downlink Shared Channel
- an uplink data channel specifically, a DMRS for PUSCH (Physical Uplink Shared Channel) may be interpreted in the same way as a DMRS for PDSCH.
- DMRS can be used for channel estimation in devices, eg, UE 200, as part of coherent demodulation.
- DMRS may reside only in resource blocks (RBs) used for PDSCH transmission.
- a DMRS may have multiple mapping types. Specifically, the DMRS has mapping type A and mapping type B. For mapping type A, the first DMRS is placed in the 2nd or 3rd symbol of the slot. In mapping type A, the DMRS may be mapped relative to slot boundaries, regardless of where in the slot the actual data transmission begins. The reason the first DMRS is placed in the second or third symbol of the slot may be interpreted as to place the first DMRS after the control resource sets (CORESET).
- CORESET control resource sets
- mapping type B the first DMRS may be placed in the first symbol of data allocation. That is, the position of the DMRS may be given relative to where the data is located rather than relative to slot boundaries.
- DMRS may have multiple types (Type). Specifically, DMRS has Type 1 and Type 2. Type 1 and Type 2 differ in mapping in the frequency domain and the maximum number of orthogonal reference signals. Type 1 can output up to 4 orthogonal signals with single-symbol DMRS, and Type 2 can output up to 8 orthogonal signals with double-symbol DMRS.
- FIG. 4 is a functional block diagram of the UE200.
- the UE 200 includes a radio signal transmission/reception unit 210, an amplifier unit 220, a modem unit 230, a control signal/reference signal processing unit 240, an encoding/decoding unit 250, a data transmission/reception unit 260, and a control unit 270. .
- the radio signal transmitting/receiving unit 210 transmits/receives radio signals according to NR.
- the radio signal transmitting/receiving unit 210 supports Massive MIMO, CA that bundles multiple CCs, and DC that simultaneously communicates between the UE and each of the two NG-RAN Nodes.
- the amplifier section 220 is configured by a PA (Power Amplifier)/LNA (Low Noise Amplifier) and the like. Amplifier section 220 amplifies the signal output from modem section 230 to a predetermined power level. In addition, amplifier section 220 amplifies the RF signal output from radio signal transmission/reception section 210 .
- PA Power Amplifier
- LNA Low Noise Amplifier
- the modulation/demodulation unit 230 executes data modulation/demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB 100 or other gNB).
- the modem unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM)/Discrete Fourier Transform-Spread (DFT-S-OFDM). Also, DFT-S-OFDM may be used not only for uplink (UL) but also for downlink (DL).
- the control signal/reference signal processing unit 240 executes processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200.
- control signal/reference signal processing unit 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, for example, radio resource control layer (RRC) control signals. Also, the control signal/reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.
- RRC radio resource control layer
- the control signal/reference signal processing unit 240 executes processing using reference signals (RS) such as Demodulation Reference Signal (DMRS) and Phase Tracking Reference Signal (PTRS).
- RS reference signals
- DMRS Demodulation Reference Signal
- PTRS Phase Tracking Reference Signal
- a DMRS is a known reference signal (pilot signal) between a terminal-specific base station and a terminal for estimating the fading channel used for data demodulation.
- PTRS is a terminal-specific reference signal for estimating phase noise, which is a problem in high frequency bands.
- reference signals may include Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS) for position information.
- CSI-RS Channel State Information-Reference Signal
- SRS Sounding Reference Signal
- PRS Positioning Reference Signal
- control channels include Physical Downlink Control Channel (PDCCH), Physical Uplink Control Channel (PUCCH), Random Access Channel (RACH), Downlink Control Information (DCI) including Random Access Radio Network Temporary Identifier (RA-RNTI), and Physical Broadcast Channel (PBCH) etc. are included.
- PDCCH Physical Downlink Control Channel
- PUCCH Physical Uplink Control Channel
- RACH Random Access Channel
- DCI Downlink Control Information
- RA-RNTI Random Access Radio Network Temporary Identifier
- PBCH Physical Broadcast Channel
- data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).
- Data means data transmitted over a data channel.
- a data channel may be read as a shared channel.
- control signal/reference signal processing unit 240 may receive downlink control information (DCI).
- DCI has existing fields such as DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Allocation), TDRA (Time Domain Resource Allocation), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number) , NDI (New Data Indicator), RV (Redundancy Version), etc.
- the value stored in the DCI Format field is an information element that specifies the DCI format.
- the value stored in the CI field is an information element that specifies the CC to which DCI is applied.
- the value stored in the BWP indicator field is an information element that specifies the BWP to which DCI applies.
- the BWP that can be specified by the BWP indicator is configured by an information element (BandwidthPart-Config) included in the RRC message.
- the value stored in the FDRA field is an information element that specifies the frequency domain resource to which DCI is applied.
- a frequency domain resource is identified by a value stored in the FDRA field and an information element (RA Type) included in the RRC message.
- the value stored in the TDRA field is an information element that specifies the time domain resource to which DCI applies.
- the time domain resource is specified by the value stored in the TDRA field and information elements (pdsch-TimeDomainAllocationList, pusch-TimeDomainAllocationList) included in the RRC message.
- a time-domain resource may be identified by a value stored in the TDRA field and a default table.
- the value stored in the MCS field is an information element that specifies the MCS to which DCI applies.
- the MCS is specified by the values stored in the MCS and the MCS table.
- the MCS table may be specified by RRC messages or identified by RNTI scrambling.
- the value stored in the HPN field is an information element that specifies the HARQ Process to which DCI is applied.
- the value stored in NDI is an information element for specifying whether data to which DCI is applied is initial transmission data.
- the value stored in the RV field is an information element that specifies the data redundancy
- the encoding/decoding unit 250 performs data segmentation/concatenation, channel coding/decoding, etc. for each predetermined communication destination (gNB 100 or other gNB).
- the encoding/decoding unit 250 divides the data output from the data transmission/reception unit 260 into pieces of a predetermined size, and performs channel coding on the divided data. Also, encoding/decoding section 250 decodes the data output from modem section 230 and concatenates the decoded data.
- the data transmission/reception unit 260 executes transmission/reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmitting/receiving unit 260 performs PDU/SDU in multiple layers (medium access control layer (MAC), radio link control layer (RLC), packet data convergence protocol layer (PDCP), etc.). Assemble/disassemble etc. The data transmission/reception unit 260 also performs data error correction and retransmission control based on HARQ (Hybrid Automatic Repeat Request).
- MAC medium access control layer
- RLC radio link control layer
- PDCP packet data convergence protocol layer
- HARQ Hybrid Automatic Repeat Request
- the control unit 270 controls each functional block that configures the UE200.
- the control unit 270 assumes that the terminal uses the wideband carrier bandwidth.
- a control unit is configured to perform communication in which a second number of frequency resources, which is larger than the number of frequency resources, can be used.
- the maximum carrier bandwidth supported by UE200 is the maximum CC bandwidth supported by UE200.
- the wideband carrier bandwidth is the wideband CC bandwidth that the gNB 100 sets for the UE 200.
- the maximum CC bandwidth may be referred to as maximum CBW (Channel Bandwidth), and the wideband CC bandwidth may be referred to as wideband CBW.
- the control unit 270 uses two or more specific bandwidths set with the maximum carrier bandwidth as the upper limit in the wideband carrier bandwidth. communication may be performed.
- the same subcarrier spacing hereinafter referred to as SCS
- the number of 2 or more specific bandwidths may be equal to or less than the upper limit number of CCs supported by UE 200 in CA.
- the two or more specific bandwidths are bandwidths set within one CC bandwidth set by the gNB 100, the subcarrier spacing (hereinafter, SCS) applied to each of the two or more specific bandwidths are identical. Therefore, the specific bandwidth is a concept different from CC to which different SCSs can be applied.
- SCS subcarrier spacing
- two or more specific bandwidths are bandwidths set within one CC bandwidth set by gNB100, so two or more specific bandwidths can be processed by one FFT (Fast Fourier Transform). , is set in one serving cell for two or more specific bandwidths. Therefore, specific bandwidth is a different concept than CC, which needs to be processed by separate FFTs. A specific bandwidth is a different concept from CCs in which separate serving cells are configured.
- FFT Fast Fourier Transform
- FIG. 5 is a functional block configuration diagram of gNB100. As shown in FIG. 5, the gNB 100 has a receiver 110, a transmitter 120 and a controller .
- the receiving unit 110 receives various signals from the UE200.
- the receiver 110 may receive the UL signal via PUCCH or PUSCH.
- the transmission unit 120 transmits various signals to the UE200.
- Transmitting section 120 may transmit the DL signal via PDCCH or PDSCH.
- the control unit 130 controls the gNB100.
- the control unit 130 assumes that the terminal uses the wideband CC bandwidth.
- a control unit is configured to perform communication in which a second number of frequency resources, which is larger than the number of frequency resources, can be used.
- a GB Guard Band
- the band within the CBW excluding the GB is a band that can be used for transmission.
- Such a band is set by the number of RBs (Resource Blocks) (Transmission Bandwidth Configuration N RB in FIG. 6).
- Active RBs Transmission Bandwidths
- Transmission Bandwidth may be called BWP (Bandwidth Part).
- the upper limit of CBW (hereafter, maximum CBW) is set for each SCS. For example, if the SCS is 15kHz in FR1, the maximum CBW is 50MHz. If the SCS is 30kHz in FR1, the maximum CBW is 100MHz. If the SCS is 60kHz in FR1, the maximum CBW is 200MHz. If the SCS is 60kHz in FR2, the maximum CBW is 200MHz. If the SCS is 120kHz in FR2, the maximum CBW is 400MHz. When using a bandwidth wider than the maximum CBW, it is necessary to use CA that bundles two or more CCs.
- the maximum CBW for each SCS is defined so that the number of FFT points is less than or equal to a specific number of points (eg, 4096).
- the number of specific points depends on the device performance of UE200 and the device performance of gNB100.
- the existing technology of the embodiment will be described below.
- the number of frequency resources hereinafter, the number of RBs
- the number of RBs is 66 when the CBW is 100 MHz.
- the wideband CBW (wideband CC bandwidth) that can be set by gNB100 is 400MHz
- the maximum CBW supported by UE200 is 100MHz
- the upper limit of CCs supported by UE200 in CA is 4. Think about your case.
- gNB 100 can set wideband CBW, but when UE 200 does not perform wideband CBW, we focused on the fact that wideband CBW cannot be used for UE 200 that does not support wideband CBW (see FIG. 8 ).
- UE 200 and gNB 100 assume that UE 200 uses wideband CBW when gNB 100 sets a wideband CBW that is wider than the maximum CBW supported by UE 200. communication that can use a large number of second frequency resources.
- the first number of frequency resources is referred to as the first number of usable RBs
- the second number of frequency resources is referred to as the second number of usable RBs.
- the maximum CBW supported by UE200 may be specified by an information element (for example, supportedBandwidthDL) reported by UE200.
- the broadband CBW configured by gNB 100 may be configured by information elements (eg SCS-SpecificCarrier) included in RRC parameters (eg ServingCellConfig).
- a case where the gNB 100 sets a broadband CBW wider than the maximum CBW supported by the UE 200 may be read as a case where the gNB 100 sets a PRB number larger than the maximum number of PRBs supported by the UE 200 .
- the first number of available RBs may be the number of RBs that can be used assuming that the UE 200 uses the wideband CBW as the CBW, or the number of RBs that can be used assuming that the UE 200 uses CA using CCs corresponding to the wideband CBW. may be It may be considered that the first number of available RBs is the number of RBs determined by the existing technology.
- the second number of available RBs may be considered to be the number of newly introduced RBs.
- the first available number of RBs for 400 MHz CBW is 264.
- a mechanism is introduced that makes it possible to use more than 264 RBs when the gNB 100 sets a CBW of 400 MHz.
- a larger number of RBs than the existing value (264) may be available in a CBW of 400 MHz (eg CC bandwidth of gNB100).
- a GB narrower than the existing GB may be introduced as a CBW of 400 MHz, or a larger number of FFT points than the existing number of FFT points may be introduced.
- a GB narrower than the existing GB may be introduced as a CBW of 100 MHz, or a larger number of FFT points than the existing number of FFT points may be introduced.
- the second number of usable RBs may be newly introduced as a number specifiable by the Transmission Bandwidth Configuration N RBs described in FIG. Furthermore, as a value (maxNrofPhysicalResourceBlocks) that can be set in an information element (e.g., carrierBandwitdh included in SCS-SpecificCarrier) included in the RRC parameter (e.g., ServingCellConfig), the existing value (e.g., 275) A large value may be introduced.
- an information element e.g., carrierBandwitdh included in SCS-SpecificCarrier
- RRC parameter e.g., ServingCellConfig
- the configuration that introduces the second number of usable RBs may be read as a configuration that introduces a GB narrower than the existing GB as a GB for broadband CBW.
- the existing GB may be the minimum guard band specified by 3GPP TS38.101 V17.0.0.
- the existing GB may be read as a configuration in which a GB smaller than the sum of GBs of CCs corresponding to broadband CBW (that is, GB of CCs ⁇ the number of CCs) is introduced as a GB of broadband CBW.
- a new GB may be defined in association with the wideband CBW as a GB applied to the case where the gNB 100 sets a wideband CBW wider than the maximum CBW supported by the UE 200 .
- a new GB may be defined as a minimum guard band.
- a new number of FFT points larger than the existing number of FFT points may be defined.
- the new number of FFT points may be 8192.
- a CBW wider than the existing upper limit of CBW may be set as the CBW associated with the SCS. For example, for a 15 kHz SCS, a CBW (eg, 100 MHz) larger than the existing upper limit of CBW (eg, 50 MHz) may be set.
- the existing value (e.g., 275) A large value may be introduced.
- Band allocation wider than the maximum CBW supported by UE 200 may be allocated within wideband CBW. Specifically, when a broadband CBW wider than the maximum CBW supported by the UE 200 is set, the UE 200 and the gNB 100 communicate using two or more specific bandwidths set with the maximum CBW as the upper limit in the wideband CBW. may be executed.
- condition that the SCS applied to each of two or more specific bandwidths is the same may be required.
- a condition may be required that two or more specified bandwidths do not overlap.
- a GB that is smaller than the existing GB may be introduced as the GB provided at both ends of the maximum CBW supported by the UE200.
- new GBs may be defined in association with the maximum CBW.
- a new GB may be defined as a minimum guard band.
- the specific bandwidth is a BWP that can be activated simultaneously within the broadband CBW.
- Two or more BWPs that can be activated simultaneously within a wideband CBW may be considered a BWP group.
- the specific bandwidth may be considered to be an RB group in the frequency direction.
- a specific frequency band may be referred to as an RB set.
- a special BWP may be defined as a BWP that can set two or more specific bandwidths.
- one serving cell may simultaneously allocate PDSCH resources to two or more specific bandwidths.
- one DCI may include allocation information elements that specify PDSCH resources to allocate for each of two or more specific bandwidths.
- one DCI includes an allocation information element that specifies a PDSCH resource to be allocated for any one of the two or more specific bandwidths, and the allocation information element included in the DCI is assigned to another specific bandwidth. may also be applied.
- two or more DCIs corresponding to two or more specific bandwidths may individually include allocation information elements that specify PDSCH resources to allocate for each of the two or more specific bandwidths.
- the FDRA field may be extended.
- the number of bits in the FDRA field that indicates resource allocation to two or more specific bandwidths (BWP) is extended.
- the FDRA field notifies resource allocation to one RB group, and an information element indicating to which RB group the resource allocation is applied (for example, RB group bitmap) may be signaled separately from the FDRA field.
- the third option considers TB (Transport Block), HARQ process and HARQ feedback. Specifically, the mechanism shown below may be adopted.
- different TBs may be mapped to each of the two or more specific bandwidths, and different HARQ processes may be configured to each of the two or more specific bandwidths.
- a TB may be mapped across two or more specific bandwidths, and one HARQ process may be configured for two or more specific bandwidths.
- HARQ feedback may be performed individually for each of two or more specific bandwidths using a CBG (Code Block Group) mechanism.
- CBG Code Block Group
- the 4th option considers UL BWP. Specifically, the mechanism shown below may be employed.
- the center of the UL BWP should be aligned with the center of any one of the specific frequency bands set within the wideband CBW.
- PDCCH CORESET
- the mechanism shown below may be adopted.
- PDCCH may be assumed to be mapped to one specific frequency band (Case 1).
- PDCCH Physical Downlink Control Channel
- New values different from existing values may be introduced for the upper limits of the number of CCEs (Control Channel Elements) and the number of BDs (Blind Decoding). New values may be introduced for the upper limits of the number of CCEs and BDs when Case 2 and Case 3 are applied.
- Sixth option considers CSI-RS and CSI reporting. Specifically, the mechanism shown below may be employed.
- CSI-RS may be assumed to be mapped to one specific frequency band (Case 1).
- CSI-RS can be mapped to each of two or more specific frequency bands (Case 2).
- CSI-RS may be assumed to be mappable across two or more specific frequency bands (Case 3).
- the unit of CSI reporting may differ for each case described above. For example, in case 1 and case 2, separate CSI reporting may be performed for each specific frequency band, and in case 3, aggregated CSI reporting may be performed for two or more specific frequency bands.
- CSI-RS may be different for each case described above.
- Applications of CSI-RS include CSI-Acquisition, Beam management, Tracking of UE200, and Mobility of UE200.
- An application condition may be defined to set two or more specific frequency bands within the broadband CBW.
- the applicable conditions may include conditions such as frequency bands, bands, Duplex mode, Serving Cell type, etc., in which two or more specific frequency bands can be set.
- the application condition may be predetermined in the wireless communication system 10.
- UE Capabilities may be defined that implicitly or explicitly indicates whether the UE 200 is compatible with two or more specific frequency bands set within the wideband CBW. For example, depending on the terminal type such as IoT terminal (reduced capability), IAB (IAB-MT)-MT (Mobile Termination), FWA (Fixed Wireless Access) terminal, UE 200 is set within the broadband CBW Two or more specific frequency bands It may be implicitly indicated whether or not it corresponds to Other information elements included in the UE Capability may implicitly indicate whether or not the UE 200 supports two or more specific frequency bands set within the wideband CBW.
- two or more specific frequency bands may be set within the wideband CBW.
- the upper limit of the number of specific frequency bands set within the wideband CBW may be determined based on the upper limit of the number of CA-enabled CCs.
- the upper limit of the number of specific frequency bands may be the same as the upper limit of the number of CA-enabled CCs.
- the UE 200 and the gNB 100 set a wideband CC bandwidth (CBW) wider than the maximum CC bandwidth (maximum CBW) supported by the UE 200 when the gNB 100 sets the wideband CC bandwidth.
- CBW wideband CC bandwidth
- maximum CBW maximum CBW
- the terminal uses the gNB 100
- communication is performed in which the number of second frequency resources, which is larger than the number of the first frequency resources available to the gNB 100, can be used.
- the number of second frequency resources greater than the number of first frequency resources (number of existing RBs) is Since it can be used, frequency utilization efficiency can be improved.
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't
- a functional block (component) that performs transmission is called a transmitting unit or transmitter.
- the implementation method is not particularly limited.
- FIG. 10 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 10, the device may be configured as a computing device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, and the like.
- the term "apparatus” can be read as a circuit, device, unit, or the like.
- the hardware configuration of the device may be configured to include one or more of each device shown in the figure, or may be configured without some of the devices.
- Each functional block of the device (see FIG. 4) is realized by any hardware element of the computer device or a combination of the hardware elements.
- each function of the device is implemented by causing the processor 1001 to perform calculations, controlling communication by the communication device 1004, and controlling the It is realized by controlling at least one of data reading and writing in 1002 and storage 1003 .
- a processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including interfaces with peripheral devices, a control unit, an arithmetic unit, registers, and the like.
- CPU central processing unit
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the program a program that causes a computer to execute at least part of the operations described in the above embodiments is used.
- the above-described various processes may be executed by one processor 1001, or may be executed by two or more processors 1001 simultaneously or sequentially.
- Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.
- the memory 1002 is a computer-readable recording medium, and is composed of at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. may be
- ROM Read Only Memory
- EPROM Erasable Programmable ROM
- EEPROM Electrically Erasable Programmable ROM
- RAM Random Access Memory
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store programs (program code), software modules, etc. capable of executing a method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like.
- Storage 1003 may also be referred to as an auxiliary storage device.
- the recording medium described above may be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003 .
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc., for realizing at least one of frequency division duplex (FDD) and time division duplex (TDD).
- FDD frequency division duplex
- TDD time division duplex
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (eg, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the device includes hardware such as a microprocessor, digital signal processor (DSP), application specific integrated circuit (ASIC), programmable logic device (PLD), field programmable gate array (FPGA), etc.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods.
- the notification of information may include physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), other signals, or a combination thereof
- RRC signaling may also be referred to as RRC messages, e.g., RRC Connection Setup ) message, RRC Connection Reconfiguration message, or the like.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- Future Radio Access FAA
- New Radio NR
- W-CDMA registered trademark
- GSM registered trademark
- CDMA2000 Code Division Multiple Access 2000
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi (registered trademark)
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, other suitable systems, and/or next-generation systems enhanced therefrom.
- a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
- a specific operation that is performed by a base station in the present disclosure may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may be performed by the base station and other network nodes other than the base station (e.g. MME or S-GW, etc., but not limited to).
- MME or S-GW network nodes
- the case where there is one network node other than the base station is exemplified above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).
- Information, signals can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.
- Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input and output information may be overwritten, updated, or appended. The output information may be deleted. The entered information may be transmitted to other devices.
- the determination may be made by a value represented by one bit (0 or 1), by a true/false value (Boolean: true or false), or by numerical comparison (for example, a predetermined value).
- notification of predetermined information is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the Software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to access websites, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.
- wired technology coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wireless technology infrared, microwave, etc.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- the channel and/or symbols may be signaling.
- a signal may also be a message.
- a component carrier may also be called a carrier frequency, a cell, a frequency carrier, or the like.
- system and “network” used in this disclosure are used interchangeably.
- information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information.
- radio resources may be indexed.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNodeB eNodeB
- gNodeB gNodeB
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area corresponding to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head: RRH) can also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)
- Head: RRH can also provide communication services.
- cell refers to part or all of the coverage area of at least one of a base station and base station subsystem that provides communication services in this coverage.
- MS Mobile Station
- UE User Equipment
- a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
- At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a mobile station (user terminal, hereinafter the same).
- communication between a base station and a mobile station is replaced with communication between multiple mobile stations (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- the mobile station may have the functions that the base station has.
- words such as "up” and “down” may be replaced with words corresponding to inter-terminal communication (for example, "side”).
- uplink channels, downlink channels, etc. may be read as side channels.
- a mobile station in the present disclosure may be read as a base station.
- the base station may have the functions that the mobile station has.
- a radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe.
- a subframe may further consist of one or more slots in the time domain.
- a subframe may be a fixed time length (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, transmission and reception specific filtering operations performed by the receiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, and/or the like.
- SCS subcarrier spacing
- TTI transmission time interval
- number of symbols per TTI radio frame structure
- transmission and reception specific filtering operations performed by the receiver in the frequency domain specific windowing operations performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) that is transmitted in time units larger than a minislot may be referred to as PDSCH (or PUSCH) mapping type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.
- one subframe may be called a transmission time interval (TTI)
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, may be a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms may be Note that the unit representing the TTI may be called a slot, minislot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- TTI is not limited to this.
- the TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, codewords, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one slot or one minislot is called a TTI
- one or more TTIs may be the minimum scheduling time unit.
- the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI with a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
- TTI that is shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and so on.
- long TTI for example, normal TTI, subframe, etc.
- short TTI for example, shortened TTI, etc.
- a TTI having a TTI length greater than or equal to this value may be read as a replacement.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
- the number of subcarriers included in an RB may be the same regardless of neurology, and may be 12, for example.
- the number of subcarriers included in an RB may be determined based on neumerology.
- the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long.
- One TTI, one subframe, etc. may each be configured with one or a plurality of resource blocks.
- One or more RBs are physical resource blocks (PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. may be called.
- PRB physical resource blocks
- SCG sub-carrier groups
- REG resource element groups
- PRB pairs RB pairs, etc.
- a resource block may be composed of one or more resource elements (Resource Element: RE).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a Bandwidth Part) represents a subset of contiguous common resource blocks (RBs) for a neumerology in a carrier. good.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
- BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
- One or more BWPs may be configured in one carrier for the UE.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots and symbols described above are only examples.
- the number of subframes included in a radio frame the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc.
- CP cyclic prefix
- connection means any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being “connected” or “coupled.” Couplings or connections between elements may be physical, logical, or a combination thereof. For example, “connection” may be read as "access”.
- two elements are in the radio frequency domain using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-exhaustive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.
- the reference signal can also be abbreviated as Reference Signal (RS), and may also be called Pilot depending on the applicable standard.
- RS Reference Signal
- any reference to elements using the "first”, “second”, etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed therein, or that the first element must precede the second element in any way.
- determining and “determining” used in this disclosure may encompass a wide variety of actions.
- “Judgement” and “determination” are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as “judged” or “determined”, and the like.
- "judgment” and “determination” are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment” or “decision” has been made.
- judgment and “decision” are considered to be “judgment” and “decision” by resolving, selecting, choosing, establishing, comparing, etc. can contain.
- judgment and “decision” may include considering that some action is “judgment” and “decision”.
- judgment (decision) may be read as “assuming”, “expecting”, “considering”, or the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
- Radio communication system 20 NG-RAN 100 gNB 110 receiver 120 transmitter 130 controller 200 UE 210 radio signal transmission/reception unit 220 amplifier unit 230 modulation/demodulation unit 240 control signal/reference signal processing unit 250 encoding/decoding unit 260 data transmission/reception unit 270 control unit 1001 processor 1002 memory 1003 storage 1004 communication device 1005 input device 1006 output device 1007 bus
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Abstract
Description
(1)無線通信システムの全体概略構成
図1は、実施形態に係る無線通信システム10の全体概略構成図である。無線通信システム10は、5G New Radio(NR)に従った無線通信システムであり、Next Generation-Radio Access Network 20(以下、NG-RAN20、及び端末200(以下、UE200)を含む。
・FR2:24.25 GHz~52.6 GHz
FR1では、15, 30又は60kHzのSub-Carrier Spacing(SCS)が用いられ、5~100MHzの帯域幅(BW)が用いられてもよい。FR2は、FR1よりも高周波数であり、60,又は120kHz(240kHzが含まれてもよい)のSCSが用いられ、50~400MHzの帯域幅(BW)が用いられてもよい。
次に、無線通信システム10の機能ブロック構成について説明する。
以下において、実施形態の背景について説明する。ここでは、CBWについて説明する。
以下において、実施形態の既存技術について説明する。ここでは、FR2において120kHzのSCSが用いられるケースについて例示する。このようなケースにおいて、CBWが400MHzである場合に、周波数リソース数(以下、RB数)は264である。CBWが100MHzである場合に、RB数は66である。
上述した既存技術を踏まえて、以下において、実施形態に係る適用シーンについて説明する。適用シーンでは、上述した既存技術と同様に、FR2において120kHzのSCSが用いられるケースについて例示する。このようなケースにおいて、gNB100が設定可能な広帯域CBW(広帯域CC帯域幅)が400MHzであり、UE200のサポートする最大CBW(最大CC帯域幅)が100MHzであり、CAにおいてUE200のサポートするCCの上限数が4であるケースについて考える。
ここで、第2利用可能RB数は、図6で説明したTransmission Bandwidth Configuration NRBによって指定可能な数として新たに導入されてもよい。さらに、RRCパラメータ(例えば、ServingCellConfig)に含まれる情報要素(例えば、SCS-SpecificCarrierに含まれるcarrierBandwitdh)などで取り得る値(maxNrofPhysicalResourceBlocks)に設定可能な値として、既存の値(例えば、275)よりも大きな値が導入されてもよい。
FFTポイント数として、既存のFFTポイント数(4096)よりも多い新たなFFTポイント数が定義されてもよい。新たなFFTポイント数は8192であってもよい。このようなケースにおいて、SCSと対応付けられたCBWとして、既存のCBWの上限よりも広いCBWが設定されてもよい。例えば、15kHzのSCSについて、既存のCBWの上限(例えば、50MHz)よりも大きいCBW(例えば、100Mhz)が設定されてもよい。さらに、RRCパラメータ(例えば、ServingCellConfig)に含まれる情報要素(例えば、SCS-SpecificCarrierに含まれるcarrierBandwitdh)などで取り得る値(maxNrofPhysicalResourceBlocks)に設定可能な値として、既存の値(例えば、275)よりも大きな値が導入されてもよい。
UE200のサポートする最大CBWよりも広い帯域の割当が広帯域CBW内で割り当てられてもよい。具体的には、UE200及びgNB100は、UE200のサポートする最大CBWよりも広い広帯域CBWが設定される場合において、広帯域CBWにおいて最大CBWを上限として設定される2以上の特定帯域幅を用いた通信を実行してもよい。
第1オプションでは、1つのServing Cellが2以上の特定帯域幅に対して同時にPDSCHリソースを割り当ててもよい。例えば、1つのDCIは、2以上の特定帯域幅の各々に対して割り当てるPDSCHリソースを指定する割当情報要素を含んでもよい。或いは、1つのDCIは、2以上の特定帯域幅のいずれか1つの特定帯域幅に対して割り当てるPDSCHリソースを指定する割当情報要素を含み、DCIに含まれる割当情報要素が他の特定帯域幅にも適用されてもよい。或いは、2以上の特定帯域幅に対応する2以上のDCIは、2以上の特定帯域幅の各々に対して割り当てるPDSCHリソースを指定する割当情報要素を個別に含んでもよい。
第2オプションでは、FDRAフィールドが拡張されてもよい。例えば、特定帯域幅が広帯域CBW内で同時に活性化することが可能なBWPグループとして扱われる場合に、2以上の特定帯域幅(BWP)へのリソース割当を通知するFDRAフィールドのビット数が拡張されてもよい。特定帯域幅が周波数方向のRBグループとして扱われる場合に、1つのRBグループへのリソース割当をFDRAフィールドによって通知し、いずれのRBグループにリソース割当を適用するのかを示す情報要素(例えば、RBグループのビットマップ)がFDRAフィールドとは別に通知されてもよい。
第3オプションでは、TB(Transport Block)、HARQプロセス及びHARQフィードバックについて検討する。具体的には、以下に示す仕組みが採用されてもよい。
第4オプションでは、UL BWPについて検討する。具体的には、以下に示す仕組みが採用されてもよい。
第5オプションでは、PDCCH(CORESET)について検討する。具体的には、以下に示す仕組みが採用されてもよい。
第6オプションでは、CSI-RS及びCSI報告について検討する。具体的には、以下に示す仕組みが採用されてもよい。
広帯域CBW内に2以上の特定周波数帯を設定する適用条件が定められてもよい。適用条件は、2以上の特定周波数帯を設定可能な周波数帯、バンド、Duplex mode、Serving Cellタイプなどの条件を含んでもよい。適用条件は、無線通信システム10で予め定められてもよい。
UE200が広帯域CBW内に設定される2以上の特定周波数帯に対応しているか否かを暗黙的に又は明示的に示すUE Capabilityが定義されてもよい。例えば、IoT端末(reduced capability)、IAB(IAB-MT)-MT(Mobile Termination)、FWA(Fixed Wireless Access)端末などの端末タイプによって、UE200が広帯域CBW内に設定される2以上の特定周波数帯に対応しているか否かが暗黙的に示されてもよい。UE Capabilityに含まれる他の情報要素によって、UE200が広帯域CBW内に設定される2以上の特定周波数帯に対応しているか否かが暗黙的に示されてもよい。
実施形態では、UE200及びgNB100は、UE200のサポートする最大CC帯域幅(最大CBW)よりも広い広帯域CC帯域幅(CBW)をgNB100が設定する場合において、広帯域CC帯域幅を端末が利用する仮定でgNB100が利用可能な第1周波数リソース数よりも多い第2周波数リソース数を利用可能な通信を実行する。このような構成によれば、UE200のサポートする最大CBWよりも広いCBWをgNB100が設定するケースを想定した場合に、第1周波数リソース数(既存のRB数)よりも多い第2周波数リソース数が利用可能であるため、周波数利用効率を向上することができる。
以上、実施形態に沿って本発明の内容を説明したが、本発明はこれらの記載に限定されるものではなく、種々の変形及び改良が可能であることは、当業者には自明である。
20 NG-RAN
100 gNB
110 受信部
120 送信部
130 制御部
200 UE
210 無線信号送受信部
220 アンプ部
230 変復調部
240 制御信号・参照信号処理部
250 符号化/復号部
260 データ送受信部
270 制御部
1001 プロセッサ
1002 メモリ
1003 ストレージ
1004 通信装置
1005 入力装置
1006 出力装置
1007 バス
Claims (5)
- 端末のサポートする最大キャリア帯域幅よりも広い広帯域キャリア帯域幅を基地局が設定する場合において、前記広帯域キャリア帯域幅を前記端末が利用する仮定で前記基地局が利用可能な第1周波数リソース数よりも多い第2周波数リソース数を利用可能な通信を実行する制御部を備える、端末。
- 前記制御部は、前記広帯域キャリア帯域幅において最大キャリア帯域幅を上限として設定される2以上の特定帯域幅を用いた通信を実行し、
前記2以上の特定帯域幅の各々に適用されるサブキャリア間隔は同一である、請求項1に記載の端末。 - 端末のサポートする最大キャリア帯域幅よりも広い広帯域キャリア帯域幅を基地局が設定する場合において、前記広帯域キャリア帯域幅を前記端末が利用する仮定で前記基地局が利用可能な第1周波数リソース数よりも多い第2周波数リソース数を利用可能な通信を実行する制御部を備える、基地局。
- 端末と、基地局と、を備え、
前記端末及び基地局は、前記端末のサポートする最大キャリア帯域幅よりも広い広帯域キャリア帯域幅を前記基地局が設定する場合において、前記広帯域キャリア帯域幅を前記端末が利用する仮定で前記基地局が利用可能な第1周波数リソース数よりも多い第2周波数リソース数を利用可能な通信を実行する、無線通信システム。 - 端末のサポートする最大キャリア帯域幅よりも広い広帯域キャリア帯域幅を基地局が設定する場合において、前記広帯域キャリア帯域幅を前記端末が利用する仮定で前記基地局が利用可能な第1周波数リソース数よりも多い第2周波数リソース数を利用可能な通信を実行するステップを備える、無線通信方法。
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Non-Patent Citations (5)
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"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; User equipment (UE) radio transmission and reception; Unit 1: Range 1 Standalone (Release 17), 3GPP", 3GPP TS38.101-1, December 2020 (2020-12-01) |
3GPP TS38.101 |
ASUSTEK: "Discussion on UE complexity reduction", 3GPP DRAFT; R1-2101659, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 18 January 2021 (2021-01-18), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051971814 * |
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