WO2022195883A1 - 端末及び無線通信システム - Google Patents
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- H—ELECTRICITY
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- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
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- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H04W84/04—Large scale networks; Deep hierarchical networks
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Definitions
- the present disclosure relates to terminals and wireless communication systems that support multicast/broadcast services.
- 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
- Non-Patent Document 1 simultaneous data transmission (also called distribution) services (MBS: Multicast and Broadcast Services) (tentative name) to multiple specified or unspecified terminals (User Equipment, UE) in NR. is targeted (Non-Patent Document 1).
- MMS Multicast and Broadcast Services
- MBS for example, studies are underway on scheduling UE groups to be served and improving reliability (for example, HARQ (Hybrid Automatic repeat request) feedback to the radio base station (gNB)).
- HARQ Hybrid Automatic repeat request
- DCI format 1_0 (hereinafter abbreviated as DCI 1_0 as appropriate) for at least the downlink data channel (PDSCH: Physical Downlink Shared Channel) among the existing Downlink Control Information (DCI) formats. Scheduling support is assumed.
- DCI 1_0 has the advantage of being smaller in size, but has the problem of limited functionality, such as the inability to specify the antenna port.
- the object is to provide a terminal and a wireless communication system that can be realized.
- One aspect of the present disclosure is a receiving unit (control signal/reference signal processing unit 240) that receives downlink control information for a downlink data channel, and based on specific downlink control information separate from the downlink control information , and a control unit (control unit 270) that executes scheduling of downlink data channels in data distribution for a plurality of terminals (UE 200).
- One aspect of the present disclosure is based on a receiving unit (control signal/reference signal processing unit 240) that receives downlink control information for a downlink data channel, and specific downlink control information having the same size as the downlink control information. and a control unit that executes scheduling of downlink data channels in data distribution for a plurality of terminals (UE 200).
- a receiving unit control signal/reference signal processing unit 240
- specific downlink control information having the same size as the downlink control information.
- a control unit that executes scheduling of downlink data channels in data distribution for a plurality of terminals (UE 200).
- One aspect of the present disclosure is a receiving unit (control signal/reference signal processing unit 240) that receives downlink control information for a downlink data channel, and a specific field in which some fields included in the downlink control information have been changed.
- a terminal including a control unit (control unit 270) that executes scheduling of downlink data channels in data distribution for a plurality of terminals based on the downlink control information.
- One aspect of the present disclosure is a radio communication system including a radio base station and a terminal, wherein the radio base station includes a transmission unit that transmits downlink control information for a downlink data channel, and the terminal comprises: a receiving unit that receives the downlink control information; and a control unit that executes scheduling of downlink data channels in data distribution for a plurality of terminals based on specific downlink control information separate from the downlink control information.
- a wireless communication system comprising:
- One aspect of the present disclosure is a radio communication system including a radio base station and a terminal, wherein the radio base station includes a transmission unit that transmits downlink control information for a downlink data channel, and the terminal comprises: a receiving unit that receives the downlink control information; and a control unit that executes scheduling of downlink data channels in data distribution for a plurality of terminals based on specific downlink control information having the same size as the downlink control information.
- a wireless communication system comprising:
- One aspect of the present disclosure is a radio communication system including a radio base station and a terminal, wherein the radio base station includes a transmission unit that transmits downlink control information for a downlink data channel, and the terminal comprises: A receiving unit that receives the downlink control information, and a downlink data channel in data distribution for a plurality of terminals based on specific downlink control information in which a part of the fields included in the downlink control information is changed. and a control unit that executes scheduling.
- One aspect of the present disclosure is based on a receiving unit (control signal/reference signal processing unit 240) that receives downlink control information of a minimum size for a downlink data channel, and antenna port information included in the downlink control information. , and a control unit (control unit 270) that executes scheduling of the downlink data channel.
- One aspect of the present disclosure is a radio communication system including a radio base station and a terminal, wherein the radio base station includes a transmission unit that transmits minimum size downlink control information for a downlink data channel,
- the terminal is a radio communication system comprising a receiver that receives the downlink control information, and a controller that executes scheduling of the downlink data channel based on antenna port information included in the downlink control information.
- One aspect of the present disclosure is a step of receiving minimum size downlink control information for a downlink data channel, and a step of performing scheduling of the downlink data channel based on antenna port information included in the downlink control information. and a wireless communication method.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10.
- FIG. 2 is a diagram showing a configuration example of radio frames, subframes and slots used in the radio communication system 10.
- FIG. 3 is a diagram showing a configuration example of PTM transmission scheme 1 and PTM transmission scheme 2.
- FIG. 4 is a functional block configuration diagram of gNB100 and UE200.
- FIG. 5 is a diagram showing a sequence example of PDCCH, PDSCH and HARQ feedback in MBS.
- FIG. 6 is a diagram showing sizes of main DCIs including DCI 1_3 (tentative name) according to Operation Example 1-1.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10.
- FIG. 2 is a diagram showing a configuration example of radio frames, subframes and slots used in the radio communication system 10.
- FIG. 3 is a diagram showing a configuration example of PTM transmission scheme 1 and PTM transmission scheme 2.
- FIG. 4 is a functional block configuration diagram of gNB100 and UE
- FIG. 7 is a diagram showing sizes of main DCIs including DCI 1_3 (tentative name) according to a modification of Operation Example 1-1.
- FIG. 8 is a diagram showing an example of correspondence between RNTI and DCI format according to operation example 1-1.
- FIG. 9 is a diagram illustrating an example of correspondence between RNTI and DCI format according to operation example 1-2.
- FIG. 10 is a diagram illustrating an example of correspondence between RNTI and DCI format according to Operation Example 2.
- FIG. 11 is a diagram showing a setting example of the Antenna port(s) field according to Operation Example 2.
- FIG. 12 is a diagram showing a setting example of the PUCCH resource indicator.
- FIG. 12 is a diagram showing a setting example of the PUCCH resource indicator.
- FIG. 13 is a diagram illustrating an example of correspondence between each PUCCH resource and PRI (variable field) according to Operation Example 2.
- FIG. FIG. 14 is a diagram illustrating a setting example of a variable-size DCI field according to Operation Example 2.
- FIG. 15 is a diagram showing a setting example of the Antenna port(s) field according to Operation Example 3.
- FIG. 16 is a diagram showing an example of correspondence between the DCI format and the Antenna port(s) field according to Operation Example 3.
- FIG. 17 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 the present 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 plurality of terminals 200 (User Equipment 200, hereinafter, UE 200). include.
- NR 5G New Radio
- NG-RAN 20 Next Generation-Radio Access Network 20
- UE 200 User Equipment 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 100 (hereinafter gNB 100).
- gNB 100 radio base station 100
- 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
- the gNB100 is an NR-compliant radio base station and performs NR-compliant radio communication with the UE200.
- the gNB100 and UE200 use Massive MIMO, which generates beams with higher directivity by controlling radio signals transmitted from multiple antenna elements, and Carrier Aggregation (CA), which bundles multiple component carriers (CC). , and dual connectivity (DC) in which communication is performed simultaneously between the UE and each of a plurality of NG-RAN Nodes.
- Massive MIMO which generates beams with higher directivity by controlling radio signals transmitted from multiple antenna elements
- CA Carrier Aggregation
- CC component carriers
- DC dual connectivity
- 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 a 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.
- the wireless communication system 10 may also support a higher frequency band than the FR2 frequency band. Specifically, the wireless communication system 10 may support frequency bands above 52.6 GHz and up to 114.25 GHz. Also, the radio communication system 10 may support a frequency band between FR1 and FR2.
- Cyclic Prefix-Orthogonal Frequency Division Multiplexing CP-OFDM
- DFT-S-OFDM Discrete Fourier Transform-Spread
- SCS Sub-Carrier Spacing
- DFT-S-OFDM may be applied not only to the uplink (UL) but also to the downlink (DL).
- FIG. 2 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). Note that the number of symbols forming one slot does not necessarily have to be 14 symbols (for example, 28 or 56 symbols). Also, the number of slots per subframe may vary depending on the SCS. Additionally, the SCS may be wider than 240kHz (eg, 480kHz, 960kHz, as shown in Figure 2).
- time direction (t) shown in FIG. 2 may be called the time domain, symbol period, symbol time, or the like.
- the frequency direction may also be referred to as frequency domain, resource block, resource block group, subcarrier, BWP (Bandwidth part), subchannel, common frequency resource, and the like.
- the wireless communication system 10 may provide Multicast and Broadcast Services (MBS).
- MBS Multicast and Broadcast Services
- unicast may be interpreted as one-to-one communication with a network by specifying one specific UE 200 (identification information unique to the UE 200 may be specified).
- Multicast may be interpreted as communication performed one-to-many (specified many) with the network by designating a plurality of specific UEs 200 (identification information for multicast may be designated). Note that the number of UEs 200 that receive received multicast data may eventually be one.
- Broadcast may be interpreted as one-to-unspecified communication with the network for all UE 200.
- the data to be multicast/broadcast may have the same copied content, but may have different content such as a header.
- multicast/broadcast data may be sent (delivered) at the same time, but does not necessarily require strict concurrency and may include propagation delays and/or processing delays within the RAN nodes, and the like.
- the radio resource control layer (RRC) state of the target UE 200 is either an idle state (RRC idle), a connected state (RRC connected), or another state (eg, inactive state). good too.
- the inactive state may be interpreted as a state in which some RRC settings are maintained.
- MBS Physical Downlink Shared Channel
- RRC connected UE may be read as RRC idle UE and RRC inactive UE.
- ⁇ PTM transmission method 1 (PTM-1): - A group-common PDSCH is scheduled using a group-common PDCCH (Physical Downlink Control Channel) for the MBS group of the RRC connected UE.
- PTM-1 A group-common PDSCH is scheduled using a group-common PDCCH (Physical Downlink Control Channel) for the MBS group of the RRC connected UE.
- PDCCH Physical Downlink Control Channel
- ⁇ PTM transmission method 2 (PTM-2): - A group-common PDSCH is scheduled using terminal specific (UE-specific) PDCCH with respect to the MBS group of RRC connected UE.
- ⁇ PDSCH is scrambled by group-common RNTI.
- ⁇ PTP transmission method - Schedule a UE-specific PDSCH using a UE-specific PDCCH for an RRC connected UE.
- - PDCCH CRC and PDSCH are scrambled by UE-specific RNTI. In other words, it may mean that MBS packets are transmitted by unicast.
- FIG. 3 shows a configuration example of PTM transmission method 1 and PTM transmission method 2.
- the UE-specific PDCCH/PDSCH can be identified by the target UE, but may not be identified by other UEs within the same MBS group.
- a group common PDCCH/PDSCH is transmitted on the same time/frequency resource and can be identified by all UEs within the same MBS group.
- the names of the PTM transmission methods 1 and 2 are tentative names, and may be called by other names as long as the above-described operations are performed.
- RAN nodes may deliver individual copies of MBS data packets to individual UEs over the air.
- PTM point-to-multipoint
- a RAN node may deliver a single copy of MBS data packets over the air to a set of UEs.
- HARQ Hybrid Automatic repeat request
- ACK/NACK feedback Both ACK/NACK feedback (ACK/NACK feedback) ⁇ UEs that successfully receive/decode PDSCH transmit ACK. ⁇ UEs that fail to receive/decode PDSCH transmit NACK.
- PUCCH-Config Physical Uplink Control Channel
- - PUCCH resource Shared/orthogonal between UEs depends on network settings - HARQ-ACK CB (codebook): type-1 and type-2 (CB decision algorithm (specified in 3GPP TS38.213)) ⁇ Multiplexing: Unicast or multicast can be applied ⁇ Option 2: NACK-only feedback ⁇ A UE that has successfully received and decoded PDSCH does not transmit an ACK (does not transmit a response). ⁇ A UE that fails to receive or decode PDSCH transmits NACK. ⁇ In a given UE, PUCCH resource settings can be set separately by unicast or groupcast (multicast). ACK is a positive acknowledgment. , NACK may be called a negative acknowledgment. HARQ may be referred to as automatic repeat request.
- ⁇ RRC and downlink control information (DCI: Downlink Control Information) • RRC only Also, the following content is assumed for SPS (Semi-persistent Scheduling) of multicast/broadcast PDSCH.
- DCI Downlink Control Information
- SPS is a scheduling used in contrast to dynamic scheduling, and may be called semi-fixed, semi-persistent or semi-persistent scheduling, or interpreted as Configured Scheduling (CS) good.
- CS Configured Scheduling
- Scheduling may be interpreted as the process of allocating resources for transmitting data.
- Dynamic scheduling may be interpreted as a mechanism where all PDSCHs are scheduled by DCI (eg DCI 1_0, DCI 1_1 or DCI 1_2).
- SPS may be interpreted as a mechanism by which PDSCH transmissions are scheduled by higher layer signaling such as RRC messages.
- scheduling categories of time domain scheduling and frequency domain scheduling there may be scheduling categories of time domain scheduling and frequency domain scheduling.
- Multicast PDSCH which may include group-common PDSCH and SPS group-common PDSCH
- MBS PDSCH MBS PDSCH
- PDSCH scrambled by group-common RNTI which may be referred to as G-RNTI
- data and packet may be read interchangeably, and may be interpreted as being synonymous with terms such as signal and data unit.
- transmission, reception, transmission and distribution may be read interchangeably.
- FIG. 4 is a functional block configuration diagram of gNB100 and UE200.
- the UE 200 will be described below.
- 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. .
- FIG. 4 shows only main functional blocks related to the description of the embodiment, and that the UE 200 has other functional blocks (for example, power supply section, etc.). Also, FIG. 4 shows the functional block configuration of the UE 200 (gNB 100), and please refer to FIG. 17 for the hardware configuration.
- 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 radio signal transmitting/receiving unit 210 supports MBS, and can receive a downlink channel that is common to a terminal group (group common) in data distribution for a plurality of UEs 200 .
- the radio signal transmitting/receiving unit 210 may constitute a receiving unit.
- the radio signal transmitting/receiving unit 210 can receive a downlink data channel (PDSCH) common to the terminal group, specifically, the group-common PDSCH (which may include the SPS group-common PDSCH). Also, the radio signal transmitting/receiving section 210 can receive a downlink control channel common to the terminal group, specifically, a group-common PDCCH.
- PDSCH downlink data channel
- group-common PDSCH which may include the SPS group-common PDSCH
- the radio signal transmitting/receiving section 210 can receive a downlink control channel common to the terminal group, specifically, a group-common PDCCH.
- 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, etc.).
- 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), Positioning Reference Signal (PRS) for position information, and the like.
- CSI-RS Channel State Information-Reference Signal
- SRS Sounding Reference Signal
- PRS Positioning Reference Signal
- control channels include PDCCH, PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, Downlink Control Information (DCI) including Random Access Radio Network Temporary Identifier (RA-RNTI)), and Physical Broadcast Channel (PBCH) may be included.
- PDCCH 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 and PUSCH (Physical Uplink Shared Channel).
- Data may refer to data transmitted over a data channel.
- the control signal/reference signal processing unit 240 may configure a receiving unit that receives downlink control information (DCI). Specifically, the control signal/reference signal processing unit 240 can receive the DCI for the downlink data channel.
- a downlink data channel may mean PDSCH, and (scheduling) DCI for PDSCH includes, for example, DCI format 1_0 (DCI 1_0).
- DCI for PDSCH may include DCI 1_1 and DCI 1_2.
- DCI 1_3 provisional name
- DCI may include DCI format 2_x (denoted as DCI 2_x for convenience) that notifies DCI such as a slot format to a plurality of UEs.
- DCI 1_0, 1_1, and 1_2 may all be PDSCH scheduling DCIs in one cell, but DCI 1_0 may be defined as the DCI with the smallest size among them. That is, DCI 1_0 may be defined as the minimum size DCI (downlink control information) for the PDSCH (downlink data channel). Also, DCI 1_0 may be a DCI format that schedules PDSCH when performing system information or random access. DCI 1_0 may be a DCI format in which multiple UEs within a BWP/cell assume the same DCI size.
- 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 hybrid ARQ (Hybrid automatic repeat request).
- hybrid ARQ Hybrid automatic repeat request
- the control unit 270 controls each functional block that configures the UE200.
- the control unit 270 executes control for downlink channel scheduling for MBS and HARQ feedback for this channel.
- the control unit 270 performs control corresponding to scheduling of downlink data channels that are common to a terminal group (group common) in MBS, that is, data distribution for a plurality of UEs 200 .
- control section 270 can perform control corresponding to scheduling of group-common PDCCH and group-common PDSCH.
- control section 270 controls downlink channels based on the DCI received by control signal/reference signal processing section 240.
- PDSCH which may include group-common PDSCH and SPS group-common PDSCH).
- downlink data channel scheduling can be performed.
- control unit 270 may perform PDSCH scheduling in MBS, that is, data distribution for multiple terminals, based on a specific DCI that is separate from the PDSCH DCI (eg, DCI 1_0).
- the specific DCI may be called DCI 1_3, which is the new DCI format as described above.
- DCI 1_3 may be the same size as DCI 1_0, or may be of a different size.
- DCI 1_3 is the same size as DCI 1_0 and may be the smallest size DCI. Size may mean bit length (number of bits).
- the control unit 270 may execute PDSCH scheduling in MBS based on a specific DCI having the same size as the PDSCH DCI (eg, DCI 1_1, 1-2).
- the same-sized specific DCI may have the same name as an existing DCI, such as DCI 1_2, or the specific DCI may be called DCI 1_3.
- the specific DCI may be scrambled by G-RNTI together with CRC (DCI format with CRC scrambled by G-RNTI).
- a G-RNTI is an RNTI associated with a terminal group and may be called by another name.
- the control unit 270 may execute PDSCH scheduling in MBS based on a specific DCI in which some fields included in the PDSCH DCI (for example, DCI 1_0) are changed. For example, part of the PUCCH resource indicator (PRI) field (3 bits) included in DCI 1_0 may be changed to different information.
- PRI PUCCH resource indicator
- the information to be changed may be information specified in DCI 1_2, etc., but not specified in DCI 1_0.
- it may be antenna port information.
- control unit 270 may perform PDSCH scheduling based on the antenna port information included in the DCI.
- the information of the antenna port information may be indicated by 1 bit or may be indicated by 2 bits.
- Antenna port (number) may be read as DMRS port (number).
- Control section 270 determines whether antenna port information is included in DCI based on at least one of control information of higher layers (eg, RRC) or identification information used for DCI scrambling, specifically RNTI. It may be determined whether That is, whether or not the DCI includes the antenna port field may be determined based on the control information or the RNTI.
- RRC control information of higher layers
- RNTI identification information used for DCI scrambling
- the DCI (for example, DCI 1_0) may be limited for MBS, that is, for multicast PDSCH scheduling.
- the PDSCH may be interpreted as a PDSCH for MBS (multicast PDSCH), and is a (scrambled) PDSCH associated with RNTIs such as G-RNTIs assigned to multiple UEs. good.
- the gNB 100 can execute the above-described downlink channel scheduling, HARQ control, and the like.
- the gNB 100 may include a transmitting section (control signal/reference signal processing section 240) that transmits downlink control information for the downlink data channel.
- Fig. 5 shows a sequence example of PDCCH, PDSCH and HARQ feedback in MBS.
- PDCCH which may include DCI
- PDSCH may be transmitted by unicast or multicast (broadcast).
- the UE 200 may transmit HARQ feedback (ACK/NACK) for (the transport block (TB) received via) the channel.
- ACK/NACK HARQ feedback
- both unicast PDSCH and multicast PDSCH are transmitted after one PDCCH/DCI, but either unicast PDSCH or multicast PDSCH is transmitted after one PDCCH/DCI. may be sent. That is, one PDCCH/DCI may schedule either unicast PDSCH or multicast PDSCH.
- DCI 1_0 may be supported in the above PTM-1. Specifically, in PTM-1, DCI 1_0 may be scrambled by G-RNTI with CRC (DCI 1_0 with CRC scrambled by G-RNTI).
- G-RNTI may be used for MBS group-common PDCCH CRC scrambling and/or PDSCH data scrambling.
- G-RNTI may be configured by control information of higher layers (eg, RRC).
- the G-RNTI may be any RNTI associated with the group-common PDCCH and/or the group-common PDSCH (which may include the SPS group-common PDSCH) (the same applies hereinafter).
- DCI 1_0 may be used for MBS PDSCH. However, if only DCI 1_0 can be used for MBS PDSCH scheduling, it is not desirable because of limited functionality.
- DCI 1_0 does not include antenna port information (Antenna port(s)), so PDSCH MIMO (Multiple-Input Multiple-Output) transmission is not possible (PDSCH is 1-layer transmission).
- PDSCH MIMO Multiple-Input Multiple-Output
- MBS use cases
- PDSCH transmission with relatively high data traffic such as simultaneous video streaming in stadiums, etc.
- MBS PDSCH is not desirable to limit MBS PDSCH to 1 MIMO layer. It is desirable that MIMO can also be used in MBS.
- a field containing at least one of the following information may be used.
- Carrier indicator (i) Bandwidth part indicator (iii) resource allocation type 0 can be used (iv) PRB (Physical Resource Block) bundling size indicator (v) Rate matching indicator (vi) ZP (Zero Power) CSI-RS trigger (vii) Antenna port(s) (viii) Transmission configuration indication (ix) SRS requests (x) DMRS sequence initialization (xi) Priority indicator Information (i) to (xi) is not included in DCI 1_0, but may be information included in DCI 1_2. Such a DCI field may also be applied to MBS PDSCH scheduling. An operation example of indicating such information in MBS PDSCH scheduling will be described below.
- DCI 1_0 may be used in PTM-1.
- DCI may be called Group common DCI. Since scheduling is performed by Group common DCI, the DCI format in which MBS PDSCH can be scheduled according to DCI CRC-scrambled by G-RNTI may be limited to DCI 1_0. This makes it possible to solve the problems described later.
- DCI formats that can schedule MBS PDSCH are DCI 1_0, DCI 1_1 or DCI 1_2 because they are scheduled by unicast (CRC scrambled by UE-specific RNTI) DCI.
- the DCI formats that can be used may be set by higher layers (such as RRC). This can contribute to reducing the processing load of the UE 200, and can solve the problems described later.
- PTM-1 only a maximum of one layer of PDSCH can be scheduled, but with PTM-2, multiple layers of PDSCH can be scheduled.
- a UE may assume that only a maximum of one layer of PDSCH is scheduled in PTM-1, but multiple layers of PDSCH are scheduled in PTM-2.
- DCI 1_3 (tentative name) may be newly defined. Specifically, in PTM-1 in which MBS PDSCH is scheduled using DCI CRC-scrambled by G-RNTI, MBS PDSCH may be scheduled using a DCI format other than DCI 1_0.
- a DCI format other than DCI 1_0 may be a new DCI, for example, DCI 1_3 (tentative name) may be specified. show. DCI 1_3 may have a DCI payload (or field) size different from the existing DCI format.
- DCI 1_3 may include at least one of the above information (i) to (xi) in addition to the fields used for MBS PDSCH scheduling among the fields of DCI 1_0.
- BD DCI Blind Detection
- a new DCI format such as DCI 1_3 may be a dedicated DCI format for MBS PDSCH scheduling. That is, the DCI may be detected only when MBS is set.
- PTM-1 is set, UE 200 only needs to assume that DCI 1_3 is scheduled by G-RNTI from the viewpoint of processing load reduction.
- gNB 100 and UE 200 may further operate as follows. For example, in PTM-1, which schedules MBS PDSCH using DCI CRC-scrambled by G-RNTI, MBS PDSCH may be scheduled using a DCI format other than DCI 1_0.
- Fig. 7 shows the sizes of the main DCIs including DCI 1_3 (tentative name) according to the modification of Operation Example 1-1.
- DCI 1_3 may be equal in size to any of the other existing DCI formats. Equal size may be interpreted as having the same bit length (number of bits). For example, DCI 1_3 may be the same size as DCI 1_0 (the reason why DCI 1_0 and DCI 1_3 are the same size will be described later).
- FIG. 8 shows an example of the correspondence relationship between RNTI and DCI format according to Operation Example 1-1. As shown in FIG. 8, CRC scrambled by RNTI may switch between DCI 1_0 and DCI 1_3.
- DCI 1_0 may be used when scrambled by C-RNTI
- DCI 1_3 may be used when scrambled by G-RNTI.
- the operation of being scrambled by C-RNTI and using DCI 1_0 is an operation according to 3GPP Release-15, 16, and may be applied, for example, to UE-specific PDSCH scheduling.
- the operation of being scrambled by G-RNTI and using DCI 1_3 is an operation according to 3GPP Release-17 and may be applied to MBS PDSCH scheduling.
- the switching described above may be performed using any field of DCI 1_0 (eg, Identifier for DCI formats - 1 bit).
- the RNTI is different, it can be switched based on the RNTI, but if the CRC scrambled RNTI is equal between DCI 1_0 and DCI 1_3 like PTM-2, DCI 1_0 and DCI 1_3 will be switched based on the DCI field. need to switch.
- the MBS PDSCH may be scheduled using DCI 1_1 or DCI 1_2.
- MBS PDSCH is scheduled using a DCI format other than DCI 1_0 (existing DCI format may be used). may be
- the DCI format used for MBS PDSCH scheduling may be a DCI payload equivalent to any of the existing DCI formats (DCI 1_1/DCI 1_2/DCI 2_x).
- FIG. 9 shows an example of the correspondence relationship between RNTI and DCI format according to Operation Example 1-2.
- the MBS PDSCH may be scheduled using a DCI format (CRC scrambled by G-RNTI) other than DCI 1_0, eg, DCI 1_2.
- DCI 1_2 CRC scrambled by G-RNTI
- DCI 1_3 provisional name
- the above information (i) to (xi) may be used in the MBS PDSCH schedule.
- the UE 200 may perform a CRC check that is CRC-scrambled with the G-RNTI only when the upper layer sets/instructs to measure (detect) the DCI or the DCI format.
- the size of DCI 1_1 or DCI 1_2 is variable for each UE (may be set by RRC for each UE).
- the UE common DCI size that is CRC scrambled by the G-RNTI should be constant among the UEs associated with the common G-RNTI.
- the MBS PDSCH may be scheduled using DCI 1_0.
- PTM-1 which schedules the MBS PDSCH using the DCI CRC-scrambled by the G-RNTI
- the MBS PDSCH may be scheduled using DCI 1_0.
- DCI 1_0 CRC-scrambled by G-RNTI at least 1 DCI field other than the DCI field included in the existing DCI 1_0 (hereafter may mean the DCI field especially when CRC-scrambled by C-RNTI) may contain one. That is, DCI 1_0 CRC-scrambled by G-RNTI may not include at least one DCI field included in the existing DCI 1_0.
- FIG. 10 shows an example of the correspondence relationship between the RNTI and the DCI format according to Operation Example 2.
- the size of the DCI field included in the existing DCI 1_0 is reduced, and unused DCI bits are used to replace DCI fields not included in the existing DCI 1_0 (for example, (i) to ( xi) may be any of the information) may be defined.
- PRI PUCCH resource indicator
- PRI may be 1 bit and 2 bits may be assigned to the above information (i) to (xi) indications.
- DCI 1_0 CRC scrambled by G-RNTI the following fields are unnecessary or may be reduced.
- DCI 1_0 CRC-scrambled by G-RNTI may be interpreted as not having at least one of the fields (or the number of allocated bits is reduced).
- DCI fields that do not exist in the existing DCI 1_0 (CRC scrambled by C-RNTI) (for example, the above (i) to (xi) information) may be indicated.
- Action 1 The field name remains as described above, and some fields are used for purposes other than the field name description (for example, using “Identifier for DCI formats” MIMO layer number / DMRS port index (es)), and "Action 2: The field name exists as described above, and some fields are not used for any purpose” (for example, “Identifier for DCI formats” is Present but not used for any purpose (ignored by UE)).
- operation 1 and operation 2 may be switched by an upper layer, or may be applied only when the UE 200 reports support as UE capability information (UE capability).
- UE capability information UE capability
- DCI 1_0 CRC scrambled by G-RNTI
- the number of bits of the newly added Antenna port(s) may be made variable and configurable by the upper layer.
- the size of DCI 1_0 may be unchanged (constant) depending on the upper layer (for example, the Antenna port(s) field may be variable and set in the range of 1 to 6 bits depending on the upper layer, but Antenna port(s ) field is more than 1 bit, other fields (eg, TPC command for scheduled PUCCH and/or PUCCH resource indicator may be absent or ignored).
- FIG. 11 shows a setting example of the Antenna port(s) field according to Operation Example 2.
- FIG. 11 shows an example where the size of the Antenna port(s) field can be set from 1 to 6 bits by higher layers. Note that the size of DCI 1_0 is constant and unchanged. That is, regardless of the value of Antenna_port(s)_field(x), the sum of the three fields is always 6 bits.
- FIG. 11 illustrates an example in which the TPC command is first reduced and then the PUCCH resource indicator is reduced, but the reverse is also possible. Also, the TPC command and PUCCH resource indicator (PRI) are examples, and are not limited to these.
- Fig. 12 shows a setting example of the PUCCH resource indicator.
- FIG. 12 when multiple PUCCH resources are indicated in a common DCI field of a common DCI, it is only possible to indicate PUCCH resources in conjunction with multiple UEs (one of the eight patterns in the frame Selection). Therefore, in this operation example, an operation is proposed in which the number of bits of PRI is reduced or eliminated (0 bits) without indicating PUCCH resource using 3 bits of PRI.
- the size of the PRI field is variable, so the correspondence between each PUCCH resource and PRI (variable field) may be defined.
- FIG. 13 shows an example of correspondence between each PUCCH resource and PRI (variable field).
- the number of corresponding PUCCH resources may change depending on whether the PRI field is 0 to 3 bits. Note that even if PRI is set to 0 bits, different PUCCH resources can be set between UEs by setting different PUCCH resources for each UE by RRC. Also, if it is HARQ NACK only feedback, it is possible to operate even if a common PUCCH resource is set for each UE.
- the PRI is variable length and the total size of DCI is also variable length, but in this operation example, it is DCI 1_0 and the total size of DCI is fixed. If the PRI becomes variable length, DCI bits become empty, so DCIs other than PRI are specified using the empty bits.
- variable bit length (number of bits) of fields as shown in FIG. 13 may be applied to other fields.
- FIG. 14 shows a setting example of a variable-size DCI field according to Operation Example 2.
- the field size of the PDSCH-to-HARQ_feedback timing indicator may also be variable.
- HARQ transmission for MBS PDSCH may be performed only when configured by higher layers. If not set by higher layers, the UE 200 may not perform HARQ transmission on the MBS PDSCH. In this case, the following fields may be deleted or reduced.
- DCI 1_0 may be used to perform PDSCH multi-port (MIMO) transmission.
- MIMO multi-port
- an MBS PDSCH scheduled by a DCI format that includes an "Antenna port(s)" field can be multi-port (MIMO) transmitted.
- FIG. 15 shows a setting example of the Antenna port(s) field according to Operation Example 3.
- DCI bits and number of MIMO layers/DMRS port/CDM (Code Domain Sharing) group may be indicated.
- the same DMRS port may use the same CDM group.
- Up to two DMRS ports per CDM group may be orthogonally multiplexed by frequency domain OCC (Orthogonal Cover Code) (cyclic shift).
- Which table is used may be set by the upper layer, or may be defined in advance as a 3GPP specification. Alternatively, as shown in FIG. 15, a new table may be defined for MBS.
- a DMRS port number corresponds to an antenna port, and switching between "0" and "1" may indicate antenna switching. Also, the number of DMRS ports may mean the number of MIMO layers. Also, the number of rows and/or columns of the table may be changed.
- Number of DMRS CDM group(s) without data may be a predetermined value (set by 3GPP specifications or higher layers).
- Multi-User (MU)-MIMO indicates whether PDSCH scheduling to another UE is being performed, but it is difficult to assume that MU-MIMO is applied to MBS PDSCH (MU-MIMO It may be considered wasteful to use bits for
- FIG. 16 shows an example of correspondence between the DCI format and the Antenna port(s) field according to Operation Example 3.
- the size of the Antenna port(s) field may differ depending on the DCI format/RNTI, and the Antenna port table to be referenced may differ.
- the UE 200 may not report part of the CSI (eg, Precoding Matrix Index (PMI)).
- PMI Precoding Matrix Index
- the 1-bit Antenna port(s) field that can only indicate on/off of 2-layer MIMO, even if there is no PMI report Good (gNB 100 can appropriately indicate a 1-bit Antenna port(s) field if it can recognize whether it has sufficient SNR for MIMO to work).
- UE 200 reports to gNB 100 as PMI which precoder is appropriate among multiple MIMO precoders.
- PMI which precoder is appropriate among multiple MIMO precoders.
- the horizontal and vertical channels are generally uncorrelated, so they can always be used (no rank drop occurs). Therefore, when performing 2-layer MIMO on cross-pol antennas, channel correlation between antenna ports need not be considered, so 2-layer MIMO can be used on PDSCH without PMI.
- the appropriate MIMO precoder differs for each UE, so even if PMI is reported for each UE, gNB 100 cannot use PMI appropriately.
- D2D Device to Device
- V2X Vehicle to X
- IAB Integrated Access and Backhaul
- This operation example may be interpreted as scheduling multi-port (MIMO) PDSCH using DCI 1_0.
- MIMO scheduling multi-port
- Whether or not the antenna port(s) field exists may be determined according to higher layer control information and/or the RNTI in which DCI 1_0 is CRC scrambled.
- DCI 1_0 may be limited to DCI 1_0 that schedules multicast PDSCH (or DCI 1_0 may be limited to DCI 1_0 CRC-scrambled by RNTIs (eg, G-RNTI) assigned to multiple UEs).
- RNTIs eg, G-RNTI
- the PDSCH may be a multicast PDSCH (group-common PDSCH, etc.).
- the PDSCH may be a data/DMRS sequence scrambled by RNTIs (eg, G-RNTIs) allocated to multiple UEs.
- RNTIs eg, G-RNTIs
- the names PDCCH and PDSCH are used as downlink channels, but other names may be used as long as they are downlink control channels or downlink data channels (or shared channels). .
- the MBS PDSCH has been described as an example, but at least one of the operation examples described above may be applied to other downlink channels such as the MBS PDCCH. Furthermore, the operation examples described above may be combined and applied in a complex manner unless there is a contradiction.
- configure, activate, update, indicate, enable, specify, and select may be read interchangeably.
- link, associate, correspond, and map may be read interchangeably to allocate, assign, monitor. , map, may also be read interchangeably.
- each functional block may be implemented using one device physically or logically coupled, or directly or indirectly using two or more physically or logically separate devices (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. 17 is a diagram showing an example of the hardware configuration of the device.
- the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a 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 various processes described above 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 combinations thereof, and RRC signaling may also be referred to as RRC messages, e.g., RRC Connection Setup ) message, RRC Connection Reconfiguration message, or the like.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC signaling e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), other signals, or combinations thereof
- RRC signaling may also be referred to as RRC messages, e.g., RRC Connection Setup ) message, R
- 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 body may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile body (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 (or sidelinks).
- 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 also 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
- multiple consecutive subframes may be called a TTI
- 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
- 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 regular 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 consist of one or more resource blocks.
- One or more RBs are physical resource blocks (Physical RB: 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 a 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 defined using at least one of one or more wires, cables and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and light (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 "judgement” 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 200UE 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
前記下りリンク制御情報を受信する受信部と、前記下りリンク制御情報と別個の特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部とを備える無線通信システムである。
前記下りリンク制御情報を受信する受信部と、前記下りリンク制御情報と同サイズの特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部とを備える無線通信システムである。
前記下りリンク制御情報を受信する受信部と、前記下りリンク制御情報に含まれる一部のフィールドが変更された特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部とを備える無線通信システムである。
前記端末は、前記下りリンク制御情報を受信する受信部と、前記下りリンク制御情報に含まれるアンテナポート情報に基づいて、前記下りデータチャネルのスケジューリングを実行する制御部とを備える無線通信システムである。
(1.1)システム構成例
図1は、本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、及び複数の端末200(User Equipment 200、以下、UE200)を含む。
・FR2:24.25 GHz~52.6 GHz
FR1では、15, 30または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または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。
無線通信システム10では、マルチキャスト/ブロードキャスト・サービス(MBS:Multicast and Broadcast Services)が提供されてよい。
・RRC connected UEのMBS groupに対して、グループ共通(group-common)PDCCH(Physical Downlink Control Channel)を用いてgroup-common PDSCHをスケジューリングする。
・RRC connected UEのMBS groupに対して、端末固有(UE-specific)PDCCHを用いてgroup-common PDSCHをスケジューリングする。
・RRC connected UEに対して、UE-specific PDCCHを用いてUE-specific PDSCHをスケジューリングする。
・PDSCH受信・復号に成功したUEは、ACKを送信する
・PDSCH受信・復号に失敗したUEは、NACKを送信する
・PUCCH(Physical Uplink Control Channel)リソース設定:マルチキャスト向けにPUCCH-Configを設定できる
・PUCCHリソース:UE間の共有/直交(shared/orthogonal)は、ネットワークの設定による
・HARQ-ACK CB (codebook):type-1及びtype-2(CB決定アルゴリズム(3GPP TS38.213において規定))をサポート
・多重化:ユニキャストまたはマルチキャストを適用可
・オプション2:NACKのみをフィードバック(NACK-only feedback)
・PDSCH受信・復号に成功したUEは、ACKを送信しない(応答を送信しない)
・PDSCH受信・復号に失敗したUEは、NACKを送信する
・所定のUEにおいて、PUCCHリソース設定は、ユニキャストまたはグループキャスト(マルチキャスト)によって別々に設定できる
なお、ACKは、positive acknowledgement(肯定応答)、NACKは、negative acknowledgement(否定応答)と呼ばれてもよい。HARQは、自動再送要求と呼ばれてもよい。
・RRCのみ
また、マルチキャスト/ブロードキャストPDSCHのSPS(Semi-persistent Scheduling)について、次のような内容が想定されている。
・UE能力(capability)として、複数のSPS group-common PDSCHが設定できる
・SPS group-common PDSCHに対するHARQフィードバックが可能
・少なくともgroup-common PDCCHによるアクティブ化/非アクティブ化(activation/deactivation)が可能
なお、非アクティブ化(deactivation)は、解放(release)などの他の同義の用語に読み替えられてもよい。例えば、アクティブ化は、起動、開始、トリガーなど、非アクティブ化は、さらに、終了、停止などに読み替えられてもよい。
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。具体的には、gNB100及びUE200の機能ブロック構成について説明する。
次に、無線通信システム10の動作について説明する。具体的には、MBSに関する下りチャネルのスケジューリング、具体的には、DCI 1_0よりも柔軟にMBS PDSCHをスケジューリングする動作について説明する。
(ii)Bandwidth part indicator
(iii)resource allocation type 0が使用可能
(iv)PRB (Physical Resource Block) bundling size indicator
(v)Rate matching indicator
(vi)ZP (Zero Power) CSI-RS trigger
(vii)Antenna port(s)
(viii)Transmission configuration indication
(ix)SRS request
(x)DMRS sequence initialization
(xi)Priority indicator
(i)~(xi)の情報は、DCI 1_0には含まれないが、DCI 1_2に含まれる情報であってよい。このようなDCIのフィールドがMBS PDSCHのスケジューリングにも適用されてよい。以下では、MBS PDSCHのスケジューリングにおいて、このような情報を指示する動作例について説明する。
本動作例では、PTM-1では、DCI 1_0のみが使用されてよい。このようなDCIは、Group common DCIと呼ばれてもよい。Group common DCIによってスケジュールされるため、G-RNTIによってCRC scrambleされたDCIに従ってMBS PDSCHをスケジュール可能なDCI formatがDCI 1_0に限定されてよい。これにより、後述するような課題を解決できる。
(3.1.1)動作例1-1
本動作例では、DCI 1_3(仮称)が新たに規定されてよい。具体的には、G-RNTIによってCRC scrambleされたDCIを使用してMBS PDSCHをスケジュールするPTM-1において、DCI 1_0以外のDCI formatを使用してMBS PDSCHがスケジュールされてよい。
図6は、動作例1-1に係るDCI 1_3(仮称)を含む主なDCIのサイズを示す。DCI 1_3は、既存のDCI formatと異なるDCIペイロード(フィールドでもよい)のサイズとなってもよい。
本動作例では、DCI 1_1またはDCI 1_2を使用してMBS PDSCHがスケジュールされてよい。具体的には、G-RNTIによってCRC scrambleされたDCIを使用してMBS PDSCHをスケジュールするPTM-1において、DCI 1_0以外のDCI format(既存のDCI formatでよい)を使用してMBS PDSCHがスケジュールされてよい。
本動作例では、DCI 1_0を使用してMBS PDSCHがスケジュールされてよい。具体的には、G-RNTIによってCRC scrambleされたDCIを使用してMBS PDSCHをスケジュールするPTM-1において、DCI 1_0を使用してMBS PDSCHがスケジュールされてよい。
・TPC command for scheduled PUCCH - 2ビット
・PUCCH resource indicator - 3ビット
・PDSCH-to-HARQ_feedback timing indicator - 3ビット
なお、Identifier for DCI formatsについては、G-RNTIによってCRC scrambleされたDCI format 0_0(UL grant)は存在しない(MBS PUSCHが仕様化されない)ため、当該フィールドを用いてDCI 0_0とDCI 1_0とを区別する必要はなく、不要である。
・Time domain resource assignment - 4ビット
・VRB (Virtual Resource Block)-to-PRB mapping - 1ビット
・Modulation and coding scheme - 5ビット
・New data indicator - 1ビット
・Redundancy version - 2ビット
・HARQ process number - 4ビット
・Downlink assignment index - 2ビット
・TPC command for scheduled PUCCH - 2ビット
・PUCCH resource indicator - 3ビット
・PDSCH-to-HARQ_feedback timing indicator - 3ビット
・Antenna port(s) - 1ビット
ここでは、Antenna port(s)を1ビットで指示する例が示されている(動作例3も参照)。本動作例ではAntenna port(s)に注目するが、一例であり、Antenna port(s)に限られない。
・TPC command for scheduled PUCCH - 2ビット
・PUCCH resource indicator - 3ビット
・PDSCH-to-HARQ_feedback timing indicator - 3ビット
HARQフィードバックなしであれば、Downlink assignment index(DAI)も不要である。
本動作例では、DCI 1_0を使用して、PDSCHの複数ポート(MIMO)による送信が実行されてよい。具体的には、“Antenna port(s)”フィールドを含むDCI formatによってスケジュールされたMBS PDSCHは、複数ポート(MIMO)送信できる。
上述した実施形態によれば、以下の作用効果が得られる。具体的には、動作例1~3に係るgNB100及びUE200によれば、MBS、つまり、特定または不特定の複数のUEへの同時データ送信サービスにおいて、DCIを用いた柔軟かつ効率的なスケジューリングを実現し得る。
以上、実施形態について説明したが、当該実施形態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。
無線フレームは時間領域において1つまたは複数のフレームによって構成されてもよい。時間領域において1つまたは複数の各フレームはサブフレームと呼ばれてもよい。サブフレームはさらに時間領域において1つまたは複数のスロットによって構成されてもよい。サブフレームは、ニューメロロジー(numerology)に依存しない固定の時間長(例えば、1ms)であってもよい。
20 NG-RAN
100 gNB
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 (6)
- 下りデータチャネル用の下りリンク制御情報を受信する受信部と、
前記下りリンク制御情報と別個の特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部と
を備える端末。 - 下りデータチャネル用の下りリンク制御情報を受信する受信部と、
前記下りリンク制御情報と同サイズの特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部と
を備える端末。 - 下りデータチャネル用の下りリンク制御情報を受信する受信部と、
前記下りリンク制御情報に含まれる一部のフィールドが変更された特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部と
を備える端末。 - 無線基地局と端末とを含む無線通信システムであって、
前記無線基地局は、下りデータチャネル用の下りリンク制御情報を送信する送信部を備え、
前記端末は、
前記下りリンク制御情報を受信する受信部と、
前記下りリンク制御情報と別個の特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部と
を備える無線通信システム。 - 無線基地局と端末とを含む無線通信システムであって、
前記無線基地局は、下りデータチャネル用の下りリンク制御情報を送信する送信部を備え、
前記端末は、
前記下りリンク制御情報を受信する受信部と、
前記下りリンク制御情報と同サイズの特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部と
を備える無線通信システム。 - 無線基地局と端末とを含む無線通信システムであって、
前記無線基地局は、下りデータチャネル用の下りリンク制御情報を送信する送信部を備え、
前記端末は、
前記下りリンク制御情報を受信する受信部と、
前記下りリンク制御情報に含まれる一部のフィールドが変更された特定の下りリンク制御情報に基づいて、複数の端末向けのデータ配信における下りデータチャネルのスケジューリングを実行する制御部と
を備える無線通信システム。
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Non-Patent Citations (4)
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ERICSSON: "Mechanisms to support MBS group scheduling for RRC_CONNECTED UEs", 3GPP DRAFT; R1-2101726, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. eMeeting; 20210125 - 20210205, 19 January 2021 (2021-01-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051971877 * |
HUAWEI, HISILICON: "Resource configuration and group scheduling for RRC_CONNECTED UEs", 3GPP DRAFT; R1-2100189, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. E-meeting; 20210125 - 20210205, 19 January 2021 (2021-01-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051970821 * |
MEDIATEK INC.: "Discussion on NR MBS group scheduling for RRC_CONNECTED UEs", 3GPP DRAFT; R1-2100613, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 19 January 2021 (2021-01-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051971084 * |
ZTE: "Discussion on mechanisms to Support Group Scheduling for RRC_CONNECTED UEs", 3GPP DRAFT; R1-2100106, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 19 January 2021 (2021-01-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051970811 * |
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