WO2022239084A1 - 端末及び無線通信方法 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
Definitions
- the present disclosure relates to terminals and wireless communication methods compatible with 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
- HARQ-ACK codebook (CB) decision algorithm type-1 and type-2, standard
- PDSCH Physical Downlink Shared Channel
- MBS PDSCH Physical Downlink Shared Channel
- PDSCH Unicast PDSCH
- TDM time division multiplexed
- FDM frequency division multiplexed
- the configuration of HARQ-ACK CB is different depending on the multiplexing method, TDM or FDM.
- HARQ-ACK CB is based on the assumption that multiple PDSCHs are not redundantly assigned to the same symbol in a specific cell (same cell). may not. Therefore, it may be difficult for the UE to determine an appropriate HARQ-ACK CB configuration.
- the following disclosure is made in view of this situation, and aims to provide a terminal and a radio communication method that can configure appropriate HARQ feedback regardless of the multiplexing method of MBS PDSCH and Unicast PDSCH. do.
- One aspect of the present disclosure is a transmitting unit (data transmitting/receiving unit 260) that transmits automatic repeat request feedback, and a first downlink data channel that is common to the terminal group based on terminal capabilities or radio resource control layer parameters.
- a terminal (UE 200) comprising a control section (control section 270) that determines configurations of the feedback and the feedback of the terminal-specific second downlink data channel.
- One aspect of the present disclosure is a transmitting unit (data transmitting/receiving unit 260) that transmits automatic repeat request feedback, and only when a specific condition is satisfied in the same cell, the first downlink data channel that is common to the terminal group and a terminal-specific second downlink data channel are received within the same time domain (control unit 270).
- An aspect of the present disclosure is a step of transmitting automatic repeat request feedback; and determining a configuration of a second downlink data channel with the feedback.
- One aspect of the present disclosure is a step of transmitting automatic repeat request feedback, a first downlink data channel common to the terminal group only when a specific condition is satisfied in the same cell, and a terminal-specific second and assuming that the downstream data channels are received within the same time domain.
- 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 an example of configuring type-1 HARQ-ACK CB by concatenating PDSCHTDRA table/set.
- FIG. 7 is a diagram showing a configuration example of type-1 HARQ-ACK CB (when Unicast PDSCH and MBS PDSCH are subjected to FDM) according to Operation Example 1.
- FIG. 8 is a diagram showing a configuration example of type-1 HARQ-ACK CB (when Unicast PDSCH and MBS PDSCH are TDM'd) according to Operation Example 1.
- FIG. 9 is a diagram showing a configuration example of the type-1 HARQ-ACK CB according to Operation Example 2.
- 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 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
- group-common RNTI Radio Network Temporary Identifier, also called G-RNTI
- ⁇ PTM transmission method 2 (PTM-2): - Schedule a group-common PDSCH using a terminal-specific (UE-specific) PDCCH for the MBS group of the 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
- ⁇ Option 1 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
- ⁇ 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.
- 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 group-common PDSCH (may be called group common SPS PDSCH) is adopted ⁇ Multiple SPS group-common PDSCHs can be configured as UE capabilities ⁇ HARQ feedback for SPS group-common PDSCH is possible ⁇ At least activation/deactivation by group-common PDCCH (downlink control channel) is possible. good. For example, activation may be read as activation, start, trigger, etc., and deactivation may be further read as end, stop, etc. FIG.
- 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.
- Multicast SPS PDSCH reception may mean group common SPS PDSCH reception, may be SPS PDSCH received by multiple terminals, and may be G-RNTI or G-CS-RNTI (that is, multiple terminals may be SPS PDSCH reception associated with the associated RNTI). Also, Multicast may be read as Broadcast.
- multicast, groupcast, broadcast, and MBS may be read interchangeably.
- Multicast PDSCH and PDSCH scrambled by group common RNTI may be read interchangeably.
- 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. 10 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 multiple UEs 200 .
- the radio signal transmitting/receiving unit 210 can receive a downlink data channel (PDSCH) in MBS, that is, data distribution for multiple terminals.
- PDSCH downlink data channel
- the radio signal transmitting/receiving unit 210 can receive a group-common PDSCH (which may include an SPS group-common PDSCH), which is a downlink data channel (PDSCH) common to terminal groups.
- a group-common PDSCH which may include an SPS group-common PDSCH
- PDSCH downlink data channel
- radio signal transmitting/receiving section 210 can receive a downlink control channel common to a terminal group, specifically group-common PDCCH, and can receive a terminal-specific downlink control channel, specifically UE-specific 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 (messages). . 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.
- control signal/reference signal processing unit 240 may constitute a receiving unit that receives downlink control information (DCI).
- DCI downlink control information
- control signal/reference signal processing unit 240 may receive, in RRC, a message indicating activation or deactivation of a function whose activation or deactivation of HARQ feedback is indicated by DCI.
- 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.
- MAC medium access control layer
- RLC radio link control layer
- PDCP packet data convergence protocol layer
- the data transmission/reception unit 260 executes data error correction and retransmission control based on hybrid ARQ (Hybrid automatic repeat request). Specifically, the data transmitter/receiver 260 can transmit HARQ (automatic repeat request) feedback. In this embodiment, the data transmission/reception unit 260 may constitute a transmission unit.
- 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.
- the control unit 270 assumes that the SPS of the downlink data channel (PDSCH) for the terminal group, that is, the semi-fixed scheduling activation/deactivation is applied on a terminal group basis. You can
- control unit 270 can set the configuration of a codebook (which may be read as a bit string or the like) regarding HARQ feedback for MBS. Specifically, the control unit 270 can change or determine the configuration of type-1 HARQ-ACK CB (codebook) based on specific conditions.
- a codebook which may be read as a bit string or the like
- type-1 and type-2 are defined for the HARQ-ACK CB decision algorithm.
- the main difference between type-1 and type-2 is that type-1 semi-statically configures HARQ-ACK CBs, and type-2 dynamically configures HARQ-ACK CBs. It is a point to configure.
- control section 270 controls HARQ-ACK corresponding to a predetermined range (for example, a range set based on higher layer parameters) regardless of whether or not PDSCH scheduling is performed. ACK bit may be fed back.
- a predetermined range for example, a range set based on higher layer parameters
- the predetermined range is configured or activated in the UE 200 for a predetermined period of time (e.g., a set of predetermined number of candidate PDSCH reception occasions or a predetermined number of PDCCH monitoring occasions m). It may be determined based on at least one of the number of component carriers, the number of transport blocks (TB) (the number of layers or ranks), the number of code block groups per 1 TB, and whether or not spatial bundling is applied.
- the predetermined range is also called HARQ-ACK bundling window, HARQ feedback window, bundling window, feedback window, and the like.
- control section 270 determines the configuration of HARQ feedback of MBS-related PDSCH (also referred to as MBS PDSCH) and HARQ feedback of terminal-specific PDSCH. good.
- MBS-related PDSCH also referred to as MBS PDSCH
- control unit 270 controls the HARQ feedback of the PDSCH (which may be called a first downlink data channel) common to the UE group (terminal group) and the terminal-specific PDSCH (second downlink data channel). may determine the configuration with HARQ feedback.
- a terminal-specific PDSCH may be called a Unicast PDSCH.
- UE capabilities used to determine the HARQ-ACK CB configuration include, for example, the ability to simultaneously receive Unicast PDSCH and MBS PDSCH on the same symbol (frequency division multiplexing (FDM)) in a certain cell.
- FDM frequency division multiplexing
- the control unit 270 determines whether or not the MBS PDSCH (first downlink data channel) and the Unicast PDSCH (second downlink data channel) can be received within the same time domain in the same cell (that is, the same configuration may be determined based on whether it is set to be received within the time domain of .
- control section 270 configures HARQ feedback of MBS PDSCH and HARQ feedback of Unicast PDSCH based on parameters of the radio resource control layer (RRC) instead of UE capability, specifically, HARQ-ACK CB. configuration may be determined.
- RRC radio resource control layer
- control unit 270 may determine the HARQ-ACK CB configuration based on whether or not a predetermined parameter in RRC is set.
- a predetermined parameter is not limited, for example, it may be possible to indicate whether FDM of Unicast PDSCH and MBS PDSCH is applied (or whether TDM is not applied).
- control unit 270 may determine the configuration of the HARQ-ACK CB based on the contents of the values indicated by the RRC parameters. For example, the content may indicate that FDM (or TDM) of Unicast PDSCH and MBS PDSCH is applied.
- control unit 270 may interpret that the possibility of receiving the Unicast PDSCH and the MBS PDSCH at the same symbol timing in a certain cell is limited to cases where a predetermined condition is satisfied.
- control unit 270 may assume that MBS PDSCH and Unicast PDSCH are received within the same time domain only when a specific condition is satisfied in the same cell.
- control section 270 is limited to cases where HARQ-ACK bits for a given MBS PDSCH and HARQ-ACK bits for a given Unicast PDSCH correspond to different HARQ-ACK bits of type-1 HARQ-ACK CB. can be assumed.
- the gNB 100 can execute the above-described downlink channel scheduling, HARQ control, and the like.
- 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.
- HARQ-ACK CB may be configured as described above in MBS HARQ feedback.
- the type-1 HARQ-ACK CB is generated by unioning the PDSCH Time Domain Resource Allocation (TDRA) table/set.
- TDRA Time Domain Resource Allocation
- type-1 HARQ-ACK CB is semi-static as described above and may be interpreted as HARQ-ACK bits corresponding to actual and potential PDSCH receptions.
- type-1 HARQ-ACK CB is a method that assumes that multiple PDSCHs do not overlap on the same symbol in a certain cell.
- type-1 HARQ-ACK CB works when MBS PDSCH and Unicast PDSCH are TDM, but not when MBS PDSCH and Unicast PDSCH are FDM, so another method is needed .
- FIG. 6 shows an example of configuring type-1 HARQ-ACK CB by concatenating PDSCHTDRA table/set.
- FIG. 6 shows that PDSCHs with the same alphabet are represented by the same HARQ-ACK bits.
- MBS PDSCH and Unicast PDSCH are multiplexed by TDM in a cell (may be interpreted as the same cell)
- - (ii) MBS PDSCH and Unicast PDSCH are in a cell (same A configuration method when multiplexing by FDM in (may be interpreted as a cell)
- (i) may be a method of generating a CB by the same method as in the case of unicast alone based on the union of the TDRA table/set . The method may be applied to all slots. Also, both Unicast PDSCH and MBS PDSCH may be applied limited to slots in which they can be transmitted.
- (ii) may be a method of generating a CB by a method different from the case of unicast alone, without or based on the union of the TDRA table/set.
- the CB may be generated by any of the following methods.
- Option 1 CB for Unicast PDSCH over all slots and CB for MBS PDSCH over all slots are generated and finally concatenated
- Option 2 CB for Unicast PDSCH in each slot and for MBS PDSCH Generating and concatenating CBs is repeated for all slots
- Option 3 Unicast PDSCH and MBS PDSCH are divided into Start and Length Indicator Value (SLIV) groups (for example, A, B, and C in FIG. SLIV group), in each SLIV group, generate and concatenate CB for Unicast PDSCH and CB for MBS PDSCH, repeat for all SLIV groups of all slots
- SLIV Start and Length Indicator Value
- the UE 200 may operate according to operation examples 1-1 to 1-4.
- a predetermined UE capability is a predetermined value
- Unicast PDSCH and MBS PDSCH are on the same symbol (may be replaced with other time domain wording)
- It may also be a UE capability that indicates whether or not a function of receiving simultaneously with UE (which may be interpreted as supporting FDM) is supported.
- Predetermined RRC parameters are set For example, RRC parameters indicating whether or not to execute (ii) may be used. If the RRC parameter is configured, (i) may apply, and if not configured, (ii) may apply.
- the network can appropriately control the UE 200 so as to satisfy the required communication quality.
- Predetermined RRC parameter is a predetermined value
- an RRC parameter that directly indicates (i) or (ii) may be used. Even with such an operation example, the network can appropriately control the UE 200 so as to satisfy the required communication quality.
- FIG. 1-4 shows a configuration example of type-1 HARQ-ACK CB related to (when Unicast PDSCH and MBS PDSCH are FDM'd).
- FIG. 8 shows a configuration example of type-1 HARQ-ACK CB according to operation example 1 (when Unicast PDSCH and MBS PDSCH are TDM'd).
- PDSCH candidates in the TDRA table/set may be assigned to the same symbol in a certain cell, (ii), that is, the configuration method when Unicast PDSCH and MBS PDSCH are FDM, may be applied.
- (i) or (ii) may be applied if there is a possibility that the candidates of the indication in the PDSCH-to-HARQ_feedback timing indicator field of DCI will be scheduled in the same slot in a certain cell.
- an appropriate multiplexing method can be selected based on whether the FDM case can actually occur.
- the UE 200 may operate according to operation example 2-1.
- the HARQ-ACK CB may be configured according to the configuration method of (i) and may be limited to cases corresponding to different HARQ-ACK bits.
- FIG. 9 shows a configuration example of type-1 HARQ-ACK CB according to operation example 2.
- the configuration example shown in FIG. 9 is the same as the configuration example shown in FIG.
- the MBS PDSCH corresponding to "B” when receiving the Unicast PDSCH corresponding to "A" (SLIV group) in FIG. 9, the MBS PDSCH corresponding to "B" can be received at the same time, but the MBS PDSCH corresponding to "A” can be received at the same time. You can assume no.
- the same HARQ-ACK CB configuration method can be applied in the case of TDM/FDM.
- the UE 200 can determine the configuration of MBS PDSCH (first downlink data channel) HARQ feedback and Unicast PDSCH (second downlink data channel) HARQ feedback based on terminal capabilities or RRC parameters. .
- UE 200 can assume that MBS PDSCH and Unicast PDSCH are received within the same time domain only when a specific condition is satisfied in the same cell.
- UE 200 can configure appropriate HARQ feedback regardless of the multiplexing method of MBS PDSCH and Unicast PDSCH.
- UE 200 determines the configuration of type-1 HARQ-ACK CB based on whether MBS PDSCH and Unicast PDSCH are received within the same time domain in the same cell. You can Therefore, an appropriate type-1 HARQ-ACK CB can be configured according to the state of MBS PDSCH and Unicast PDSCH.
- 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). .
- configure, activate, update, indicate, enable, specify, and select may be read interchangeably. good.
- link, associate, correspond, and map may be read interchangeably to allocate, assign, monitor. , map, may also be read interchangeably.
- each functional block is implemented by any combination of at least one of hardware and software.
- the method of implementing each functional block is not particularly limited. That is, 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. 10 is a diagram showing an example of the hardware configuration of the device.
- 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 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) to which transport block locks, 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 "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 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
(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(下り制御チャネル)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及び当該チャネルのHARQフィードバックに関する動作について説明する。
・(ii)MBS PDSCHとUnicast PDSCHとが、あるセル(同一セルと解釈されてもよい)においてFDMによって多重される場合の構成方法
(i)は、TDRA table/setのunionに基づいてunicast単独の場合と同じ方法によってCBを生成する方法であってもよい。当該方法は、全てのスロットに適用されてもよい。また、Unicast PDSCHとMBS PDSCHとの両方が送信され得るスロットに限定されて適用されてもよい。
・(Option 2):各スロットにおいてUnicast PDSCHに対するCB、及びMBS PDSCHに対するCBを生成し、連結することを全スロットについて繰り返す
・(Option 3):Unicast PDSCH及びMBS PDSCHをStart and Length Indicator Value(SLIV)グループに分割し(例えば、図6のA, B, Cが各SLIVグループに相当する)、各SLIVグループにおいて、Unicast PDSCHに対するCB、及びMBS PDSCHに対するCBを生成し、連結することを全スロットの全SLIVグループについて繰り返す
本動作例では、type-1 HARQ-ACK CBの構成方法が、所定の条件に基づいて変更されてよい。なお、type-1 HARQ-ACK CBの構成方法は、上述した(i)または(ii)が用いられてもよい。
例えば、あるセルにおいて、Unicast PDSCHとMBS PDSCHとを同一シンボル(他の時間領域の文言に読み替えてもよい)上で同時に受信する機能(FDMに対応していることと解釈されてもよい)をサポートしているか否かを示すUE capabilityでもよい。
例えば、(ii)を実行するか否かを示すRRCパラメータでもよい。当該RRCパラメータが設定される場合、(i)が適用され、設定されない場合、(ii)が適用されてよい。
例えば、(i)または(ii)を直接示すRRCパラメータでもよい。このような動作例によっても、ネットワークは、要求される通信品質を満たすように適切にUE200を制御できる。
図7は、動作例1に係るtype-1 HARQ-ACK CBの構成例(Unicast PDSCHとMBS PDSCHとがFDMされる場合)を示す。図8は、動作例1に係るtype-1 HARQ-ACK CBの構成例(Unicast PDSCHとMBS PDSCHとがTDMされる場合)を示す。
MBS PDSCHとUnicast PDSCHとが、あるセルにおいて同一シンボル上で受信される可能性は、所定の条件が満たされる場合に限定されてもよい。
例えば、(i)の構成方法に従ってHARQ-ACK CBが構成され、異なるHARQ-ACKビットに対応する場合に限定されてよい。
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、UE200は、端末能力またはRRCのパラメータに基づいて、MBS PDSCH(第1下りデータチャネル)のHARQフィードバックと、Unicast PDSCH(第2下りデータチャネル)のHARQフィードバックとの構成を決定できる。
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 (5)
- 自動再送要求のフィードバックを送信する送信部と、
端末能力または無線リソース制御レイヤのパラメータに基づいて、端末グループに共通である第1下りデータチャネルの前記フィードバックと、端末固有の第2下りデータチャネルの前記フィードバックとの構成を決定する制御部と
を備える端末。 - 前記制御部は、同一セルにおいて、前記第1下りデータチャネルと、前記第2下りデータチャネルとが、同一の時間領域内において受信され得るか否かに基づいて、前記構成を決定する請求項1に記載の端末。
- 自動再送要求のフィードバックを送信する送信部と、
同一セルにおいて、特定の条件が満たされた場合のみ、端末グループに共通である第1下りデータチャネルと、端末固有の第2下りデータチャネルとが、同一の時間領域内において受信されると想定する制御部と
を備える端末。 - 自動再送要求のフィードバックを送信するステップと、
端末能力または無線リソース制御レイヤのパラメータに基づいて、端末グループに共通である第1下りデータチャネルの前記フィードバックと、端末固有の第2下りデータチャネルの前記フィードバックとの構成を決定するステップと
を含む無線通信方法。 - 自動再送要求のフィードバックを送信するステップと、
同一セルにおいて、特定の条件が満たされた場合のみ、端末グループに共通である第1下りデータチャネルと、端末固有の第2下りデータチャネルとが、同一の時間領域内において受信されると想定するステップと
を含む無線通信方法。
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Title |
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APPLE INC.: "Discussion on MBS reliability improvement for RRC_CONNECTED UEs", 3GPP DRAFT; R1-2103125, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210412 - 20210420, 7 April 2021 (2021-04-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052177926 * |
CATT, CBN: "Discussion on reliability improvement mechanism for RRC_CONNECTED UEs in MBS", 3GPP DRAFT; R1-2102610, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210412 - 20210420, 7 April 2021 (2021-04-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052177256 * |
ERICSSON: "Discussion on reliability mechanisms for NR MBS", 3GPP DRAFT; R1-2103739, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210412 - 20210420, 6 April 2021 (2021-04-06), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052177311 * |
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