WO2020003442A1 - ユーザ端末 - Google Patents
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- WO2020003442A1 WO2020003442A1 PCT/JP2018/024612 JP2018024612W WO2020003442A1 WO 2020003442 A1 WO2020003442 A1 WO 2020003442A1 JP 2018024612 W JP2018024612 W JP 2018024612W WO 2020003442 A1 WO2020003442 A1 WO 2020003442A1
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- harq
- user terminal
- transmission
- harq process
- dci
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
- H04W8/24—Transfer of terminal data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Definitions
- the present invention relates to a user terminal in a next-generation mobile communication system.
- carrier aggregation for integrating a plurality of component carriers (CC: Component @ Carrier) was introduced in order to widen the bandwidth.
- CC component carrier
- Each component carrier (CC) has the LTE @ Rel.
- Eight system bands are configured as one unit.
- CA carrier aggregation
- a plurality of component carriers (CC) of the same radio base station (eNB: eNodeB) are set in a user terminal (UE: User @ Equipment).
- dual connectivity Dual @ Connectivity
- CG Cell @ Group
- CC cell
- DC Dual @ Connectivity
- HARQ Hybrid Automatic Repeat Request: Hybrid Automatic Repeat Request
- a user terminal feeds back an acknowledgment signal (HARQ-ACK: HARQ-Acknowledgement) related to downlink (DL) data according to a reception result of the data.
- the radio base station controls data retransmission based on the feedback HARQ-ACK.
- Non-Patent Document 1 In the uplink in which carrier aggregation (CA) or dual connectivity (DC) is set, one independent HARQ entity exists for each cell (CC) or cell group (CG) (Non-Patent Document 1). An HARQ entity manages multiple HARQ processes in parallel.
- CA carrier aggregation
- DC dual connectivity
- a future wireless communication system for example, 5G (5th generation mobile communication system), NR (New Radio)
- 5G 5th generation mobile communication system
- NR New Radio
- BF beam forming
- at least signal transmission and reception are performed in consideration of a quasi-co-location (QCL) relationship (QCL relationship) between a plurality of signals. Controlling one is being considered.
- QCL quasi-co-location
- non-coherent DL signals for example, PDSCH (Physical Downlink Shared Channel)
- PDSCH Physical Downlink Shared Channel
- DCI Downlink Control Information
- PDCCH Physical Downlink Control Channel
- the present invention has been made in view of the above circumstances, and provides a user terminal that can appropriately configure an HARQ entity and an HARQ process even when communication is performed using a plurality of transmission points. Is one of the objectives.
- One aspect of the user terminal of the present invention is a receiving unit that monitors and receives one or more downlink control information used for scheduling a downlink shared channel transmitted from a plurality of transmission points by monitoring a downlink control channel, And a control unit for detecting an HARQ process number managed by one or more independent HARQ entities for each cell indicated by a HARQ (Hybrid Automatic Repeat Request: Hybrid Automatic Repeat Request) process number field included in the control information.
- HARQ Hybrid Automatic Repeat Request: Hybrid Automatic Repeat Request
- the present invention it is possible to appropriately configure the HARQ entity and the HARQ process when performing communication using a plurality of transmission points.
- FIG. 4 is a diagram illustrating a relationship between a conventional HARQ entity, a HARQ process, and DCI.
- 2A and 2B are diagrams illustrating an example of a case where PDSCH is transmitted from a plurality of transmission points.
- 3A and 3B are diagrams illustrating an example of the configuration of the HARQ entity and the HARQ process according to Option 1 of the first aspect.
- 4A and 4B are diagrams illustrating an example of a configuration of a HARQ entity and a HARQ process according to option 2 of the first example.
- 5A and 5B are diagrams illustrating an example of a configuration of a HARQ entity and a HARQ process according to Option 1 of the second example.
- FIG. 6A and 6B are diagrams illustrating an example of a configuration of a HARQ entity and a HARQ process according to Option 2 of the second example.
- FIG. 13 is a diagram illustrating an example of a configuration of a HARQ entity and a HARQ process according to option 3 of a second example.
- 1 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to the present embodiment.
- FIG. 3 is a diagram illustrating an example of a functional configuration of a wireless base station according to the present embodiment.
- FIG. 3 is a diagram illustrating an example of a functional configuration of a baseband signal processing unit of a wireless base station.
- FIG. 3 is a diagram illustrating an example of a functional configuration of a user terminal according to the present embodiment.
- FIG. 3 is a diagram illustrating an example of a functional configuration of a baseband signal processing unit of a user terminal.
- FIG. 2 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
- FIG. 1 is a diagram illustrating a relationship between a conventional HARQ entity, a HARQ process, and DCI.
- the DCI includes a 4-bit HARQ process number (HPN: HARQ @ Process # Number) field indicating a HARQ process number used for current data transmission.
- HPN HARQ @ Process # Number
- the HARQ entity manages multiple (up to 16) HARQ processes in parallel. That is, the HARQ process numbers exist from HPN0 to HPN15.
- the HARQ process number is also called an HARQ process ID (HARQ @ process @ identifier).
- a unit for transmitting UL (Uplink) data on a PUSCH (Physical Uplink Shared Channel) and a unit for transmitting DL data on a PDSCH are called transport blocks (TBs).
- the transport block (TB) is a unit handled in a MAC (Media Access Control) layer.
- HARQ (retransmission) control is performed for each transport block (TB).
- the user terminal transmits information indicating HARQ ACK / NACK (Positive Acknowledgment / Negative Acknowledgment) indicating whether decoding of the DL transport block received using the PDSCH was successful, to PUCCH ( Physical
- HARQ ACK / NACK Positive Acknowledgment / Negative Acknowledgment
- a single HARQ process corresponds to one transport block (TB).
- TB transport block
- a single HARQ process corresponds to one or a plurality of transport blocks (TBs).
- non-coherent DL transmission for example, PDSCH transmission
- NCJT Non-coherent ⁇ Joint ⁇ Transmission
- a transmission point Transmission @ Point
- TRP Transmission @ Reception @ Point
- the transmission point (TP) or the panel can be replaced with, for example, a beam, a spatial filter, an RS resource, a quasi co-location (QCL) or a transmission configuration information (TCI), or a concept in which these are grouped.
- FIG. 2 is a diagram showing an example of a case where PDSCH is transmitted from a plurality of transmission points.
- FIG. 2A shows a case where PDSCH (for example, PDSCH using NCJT) is transmitted from a plurality of panels to a user terminal.
- FIG. 2B shows a case where PDSCH (for example, PDSCH using NCJT) is transmitted from a plurality of transmission / reception points (TRP0 and TRP1) to the user terminal.
- TRP0 and TRP1 transmission / reception points
- TRP0 and TRP1 transmit the PDCCH to the user terminal to schedule the PDSCH separately.
- the user terminal needs to receive two PDCCHs and two PDSCHs. That is, the user terminal must have the ability to monitor the PDCCH transmitted from TRP0 and TRP1. The user terminal must have the ability to decode PDSCH transmitted from two TRPs when scheduled by the PDCCH.
- Scheduling of a non-coherent PDSCH transmitted from each of a plurality of transmission points is controlled using a single downlink control channel (eg, PDCCH) or a single downlink control information (DCI). . That is, the user terminal can monitor a single PDCCH or a single DCI transmitted from each of the plurality of transmission points, and decode the PDSCH transmitted from each of the plurality of transmission points.
- a single downlink control channel eg, PDCCH
- DCI downlink control information
- Scheduling of a non-coherent PDSCH transmitted from each of a plurality of transmission points is controlled using a plurality of downlink control channels (for example, PDCCH) or a plurality of downlink control information (DCI). That is, the user terminal can monitor a plurality of PDCCHs or a plurality of DCIs respectively transmitted from a plurality of transmission points, and decode the PDSCHs respectively transmitted from the plurality of transmission points.
- PDCCH downlink control channels
- DCI downlink control information
- the first DCI #A that schedules the PDSCH transmitted from the transmission point #A and the second DCI #B that schedules the PDSCH transmitted from the transmission point #B are transmitted to the user terminal. Is also good.
- Assumption 1 or Assumption 2 is applied depends on the assumption of backhaul latency between a plurality of transmission points. Either or both of Assumption 1 and Assumption 2 may be defined in the specification and configured in the user terminal by higher layer signaling.
- the present inventors provide a method for appropriately configuring and designing an HARQ entity and an HARQ process for a user terminal when PDSCH (for example, PDSCH using NCJT) is transmitted from a plurality of transmission points. I found it.
- transmission point in the following description may be read as at least one of a panel and a transmission / reception point (TRP).
- PDCCH in the following description may be read as NR-PDCCH.
- PDSCH may be read as NR-PDSCH.
- FIG. 3 is a diagram illustrating an example of the configuration of the HARQ entity and the HARQ process according to Option 1 of the first example.
- the example shown in FIG. 3A is based on the assumption 1: scheduling of PDSCH transmitted from each of a plurality of transmission points, using a single downlink control channel (eg, PDCCH), or a single downlink control information (eg, DCI). It is assumed that the control is performed by using this.
- a single downlink control channel eg, PDCCH
- a single downlink control information eg, DCI
- the HARQ entity is configured to manage a plurality (up to 16) HARQ processes in parallel. Multiple (up to 16) HARQ processes are supported in one DCI. That is, one DCI includes a 4-bit HARQ process number (HPN) field. HARQ process numbers exist from HPN0 to HPN15.
- Each of the plurality of transmission points generates a downlink control channel (for example, PDCCH) based on the downlink resource allocation used for data transmission and the information used for HARQ control including the HARQ process number, and transmits the downlink control channel to the user terminal.
- a downlink control channel for example, PDCCH
- the transmission point TP0 sets a HARQ process from a maximum of 16 HARQ processes, and stores the value of the HARQ process number corresponding to this HARQ process (HPN0 in FIG. 3A) in the DCI format field. Mapping is performed and transmitted to the user terminal.
- the transmission point TP1 sets a HARQ process from a maximum of 16 HARQ processes, maps the value of the HARQ process number (HPN1 in FIG. 3A) corresponding to the HARQ process to the DCI field, and sends the result to the user terminal. Send.
- the example shown in FIG. 3B is based on assumption 2: scheduling non-coherent PDSCHs transmitted from a plurality of transmission points, using a plurality of downlink control channels (eg, PDCCH) or a plurality of downlink control information (DCI). Control is assumed.
- a plurality of downlink control channels eg, PDCCH
- DCI downlink control information
- the HARQ entity is configured to manage a plurality (up to 16) HARQ processes in parallel. Multiple (up to 16) HARQ processes are supported with multiple DCIs.
- HARQ process number (HPN) field included in DCI is reduced to 3 bits.
- One reduced bit in the DCI field can be reused for other purposes.
- HARQ process numbers exist from HPN0 to HPN7.
- the transmission point TP0 sets a HARQ process from a maximum of eight HARQ processes, and the value of the HARQ process number corresponding to this HARQ process (in FIG. 3B, any of HPN0 to HPN7) Is mapped to a DCI format field and transmitted to the user terminal.
- the DCI used here includes a 3-bit HARQ process number (HPN) field.
- the transmission point TP1 sets a HARQ process from a maximum of eight HARQ processes, and sets the value of the HARQ process number corresponding to the HARQ process (in FIG. 3B, any of HPN0 to HPN7) in the DCI format field. And sends it to the user terminal.
- one DCI includes a 3-bit HARQ process number (HPN) field, but the number of bits in the HARQ process number (HPN) field is not limited to this.
- each DCI supports the same number of HARQ processes, but each DCI may support a different number of HARQ processes. If each DCI supports a different number of HARQ processes, the number of bits in the HARQ process number (HPN) field included in each DCI may be different.
- HPN HARQ process number
- TP meaning a transmission point includes a panel, a transmission / reception point, a PDCCH control resource set (CORESET: Resource @ Set) or a search space, and a PDSCH DMRS (Demodulation Reference Signal) port group. , Codeword or transport block (TB).
- CORESET Resource @ Set
- PDSCH DMRS Demodulation Reference Signal
- “supposition 1” may be configured in the user terminal by higher layer signaling.
- the user terminal operates assuming that one DCI includes a 4-bit HARQ process number (HPN) field, as shown in FIG. 3A.
- HPN 4-bit HARQ process number
- the user terminal monitors a single downlink control channel (eg, PDCCH) or a single downlink control information (eg, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 3A), respectively. I do.
- PDCCH physical downlink control channel
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI. Assuming that the DCI includes a 4-bit HARQ process number (HPN) field, the user terminal specifies the HARQ process indicated by the DCI format and performs the HARQ process on the downlink transport block (TB). .
- HPN 4-bit HARQ process number
- “Assumption 2” may be configured in the user terminal by higher layer signaling.
- the user terminal operates assuming that each DCI includes a 3-bit HARQ process number (HPN) field, as shown in FIG. 3B.
- HPN HARQ process number
- the user terminal monitors a plurality of downlink control channels (for example, PDCCH) or a plurality of downlink control information (for example, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 3B).
- PDCCH downlink control channels
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI.
- the DCI includes a 3-bit HARQ process number (HPN) field
- the user terminal identifies the HARQ process indicated by the DCI format and performs the HARQ process on the downlink transport block (TB).
- “Assumption 2” may be configured in the user terminal by upper layer signaling.
- the user terminal operates based on the assumption that one DCI includes a 4-bit HARQ process number (HPN) field from the operation based on the assumption that one DCI includes a 4-bit HARQ process number (HPN) field.
- “Assumption 1” may be configured in the user terminal by upper layer signaling.
- the user terminal performs the operation assuming that each DCI includes a 3-bit HARQ process number (HPN) field from the operation assuming that each DCI includes a 3-bit HARQ process number (HPN) field.
- the number of HARQ processes supported per HARQ entity increases linearly with the number of PDCCHs, PDSCHs, panels or transmit / receive points. That is, the maximum number of HARQ processes managed in parallel for each HARQ entity changes based on the number of PDCCHs, PDSCHs, panels or transmission / reception points.
- the capability of the user terminal with respect to the maximum number of HARQ processes that can be managed in parallel for each HARQ entity may be signaled from the user terminal to the network and defined.
- the capability of the user terminal regarding the maximum number of HARQ processes that can be managed per transmission point (per panel, per transmission / reception point), per cell, or per carrier may be signaled from the user terminal to the network.
- FIG. 4 is a diagram showing an example of the configuration of the HARQ entity and the HARQ process according to option 2 of the first example.
- the example shown in FIG. 4A is based on the assumption 1: scheduling of PDSCH transmitted from each of a plurality of transmission points, using a single downlink control channel (eg, PDCCH), or a single downlink control information (eg, DCI). It is assumed that the control is performed by using this.
- a single downlink control channel eg, PDCCH
- a single downlink control information eg, DCI
- an HARQ entity is configured to manage multiple HARQ processes in parallel. Multiple HARQ processes managed by one HARQ entity are supported by one DCI. In order to support a larger HARQ process number, the HARQ process number (HPN) field included in the DCI may be further increased from 4 bits.
- HARQ process number For example, if a PDSCH is transmitted from up to two transmission points (eg, up to two panels, or two transmission / reception points), increasing the HARQ process number (HPN) field included in the DCI to 5 bits may require one DCI. Up to 32 HARQ processes can be supported. If one DCI supports a maximum of 32 HARQ processes, HARQ process numbers exist from HPN0 to HPN31.
- Each of the plurality of transmission points generates a downlink control channel (for example, PDCCH) based on the downlink resource allocation used for data transmission and the information used for HARQ control including the HARQ process number, and transmits the downlink control channel to the user terminal.
- a downlink control channel for example, PDCCH
- the transmission point TP0 sets a HARQ process from a maximum of 32 HARQ processes, and stores the value of the HARQ process number corresponding to this HARQ process (HPN0 in FIG. 4A) in the DCI format field. Mapping is performed and transmitted to the user terminal.
- the DCI used here includes a 5-bit HARQ process number field.
- the transmission point TP1 sets a HARQ process from a maximum of 32 HARQ processes, maps the value of the HARQ process number corresponding to this HARQ process (HPN1 in FIG. 4A) to the DCI field, and sends the result to the user terminal. Send.
- one DCI includes a 5-bit HARQ process number (HPN) field, but the number of bits in the HARQ process number (HPN) field is not limited to this.
- the example illustrated in FIG. 4B is based on assumption 2: scheduling non-coherent PDSCHs respectively transmitted from a plurality of transmission points using a plurality of downlink control channels (eg, PDCCH) or a plurality of downlink control information (DCI). Control is assumed.
- a plurality of downlink control channels eg, PDCCH
- DCI downlink control information
- An HARQ entity is configured to manage multiple HARQ processes in parallel. Multiple HARQ processes are supported with multiple DCIs.
- each DCI may include a 4-bit HARQ process number (HPN) field and support up to 16 HARQ processes. If one DCI supports up to 16 HARQ processes, HARQ process numbers exist from HPN0 to HPN15.
- HPN HARQ process number
- the HARQ process number (HPN) field included in the DCI is maintained unchanged at 4 bits. That is, the HARQ process number (HPN) field included in DCI is the same as the example shown in FIG. 3A. However, the number of HARQ processes managed by one HARQ entity in parallel increases to a maximum of 32.
- the transmission point TP0 sets a HARQ process from a maximum of 16 HARQ processes, and the value of the HARQ process number corresponding to this HARQ process (in FIG. 4B, any of HPN0 to HPN15) Is mapped to a DCI format field and transmitted to the user terminal.
- the DCI used here includes a 4-bit HARQ process number field.
- the transmission point TP1 sets a HARQ process from a maximum of 16 HARQ processes, and sets the value of the HARQ process number corresponding to this HARQ process (in FIG. 4B, any of HPN0 to HPN15) in a DCI format field. And sends it to the user terminal.
- one DCI includes a 4-bit HARQ process number (HPN) field, but the number of bits in the HARQ process number (HPN) field is not limited to this.
- each DCI supports the same number of HARQ processes, but each DCI may support a different number of HARQ processes. If each DCI supports a different number of HARQ processes, the number of bits in the HARQ process number (HPN) field included in each DCI may be different.
- HPN HARQ process number
- TP transmission point refers to a panel, a transmission / reception point, a PDCCH control resource set (CORESET) or a search space, and a PDSCH DMRS port group, a codeword or a transport block (TB). ) May be read.
- CORESET PDCCH control resource set
- TB transport block
- “Assumption 1” may be configured in the user terminal by higher layer signaling.
- the user terminal operates assuming that one DCI includes a 5-bit HARQ process number (HPN) field, as shown in FIG. 4A.
- HPN HARQ process number
- the user terminal monitors a single downlink control channel (eg, PDCCH) or a single downlink control information (eg, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 4A), respectively. I do.
- PDCCH downlink control channel
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI.
- the user terminal assumes that the DCI includes a 5-bit HARQ process number (HPN) field, specifies the HARQ process indicated by the DCI format, and performs the HARQ process on the downlink transport block (TB). .
- HPN HARQ process number
- “Assumption 2” may be configured in the user terminal by higher layer signaling.
- the user terminal operates assuming that each DCI includes a 4-bit HARQ process number (HPN) field, as shown in FIG. 4B.
- HPN HARQ process number
- the user terminal monitors a plurality of downlink control channels (eg, PDCCH) or a plurality of downlink control information (eg, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 4B).
- PDCCH downlink control channels
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI.
- the DCI includes a 4-bit HARQ process number (HPN) field
- the user terminal specifies the HARQ process indicated by the DCI format and performs the HARQ process on the downlink transport block (TB).
- “Assumption 2” may be configured in the user terminal by higher layer signaling.
- the user terminal assumed that one DCI includes a 3-bit HARQ process number (HPN) field from the operation on the assumption that one DCI includes a 4-bit HARQ process number (HPN) field. Can be switched to operation.
- HPN 3-bit HARQ process number
- “Assumption 1” may be configured in the user terminal by higher layer signaling.
- the user terminal assumed that one DCI includes a 4-bit HARQ process number (HPN) field from an operation on the assumption that one DCI includes a 3-bit HARQ process number (HPN) field. Can be switched to operation.
- HPN 4-bit HARQ process number
- HARQ entities for each cell are separately configured for user terminals corresponding to the plurality of transmission points. I do.
- the control protocol RRC (Radio Resource Control) constitutes the number of HARQ entities for each cell. RRC configures the association between HARQ entities and transmission points.
- the capability of the user terminal with respect to the maximum number of HARQ entities that can be set per transmission point may be signaled from the user terminal to the network and defined.
- the capability of the user terminal with respect to the maximum number of HARQ entities that can be set per cell or per carrier may be signaled from the user terminal to the network.
- transmission point may be read as a panel, a transmission / reception point, a control resource set (CORESET) or a search space of the PDCCH, and a DMRS port group, a codeword or a transport block (TB) of the PDSCH.
- CORESET control resource set
- TB transport block
- the number of HARQ processes that each HARQ entity manages in parallel is fixed.
- the number of HARQ processes managed in parallel for each HARQ entity may be the same as the conventional one, and may be up to 16.
- the total number of HARQ processes for each cell may be the same as the conventional one, and may be up to 16. In the latter case, the number of HARQ processes managed in parallel for each HARQ entity is reduced as compared with the conventional case.
- FIG. 5 is a diagram illustrating an example of a configuration of a HARQ entity and a HARQ process according to Option 1 of the second example.
- the example shown in FIG. 5 is based on the assumption 2: scheduling non-coherent PDSCHs transmitted from a plurality of transmission points using a plurality of downlink control channels (for example, PDCCH) or a plurality of downlink control information (DCI). Control is assumed.
- a plurality of downlink control channels for example, PDCCH
- DCI downlink control information
- a plurality of independent HARQ entities (HARQ entity 0 and HARQ entity 1) are configured by RRC for each cell.
- Each HARQ entity is configured to manage multiple (up to 16) HARQ processes in parallel.
- Multiple (up to 16) HARQ processes per HARQ entity are supported in one DCI. That is, one DCI includes a 4-bit HARQ process number (HPN) field.
- HPN 4-bit HARQ process number
- the RRC may use two independent HARQ entities per cell as shown in FIG. 5A. Set.
- the HARQ process number (HPN) field included in the DCI is maintained unchanged at 4 bits.
- the total number of HARQ processes per cell increases to a maximum of 32.
- the transmission point TP0 sets a HARQ process from a maximum of 16 HARQ processes managed by the HARQ entity 0, and stores the value of the HARQ process number corresponding to the HARQ process in the DCI format field. Mapping is performed and transmitted to the user terminal.
- the DCI format used here includes a 4-bit HARQ process number (HPN) field.
- the transmission point TP1 sets a HARQ process from a maximum of 16 HARQ processes managed by the HARQ entity 1, maps the value of the HARQ process number corresponding to the HARQ process to the DCI field, and sends the HARQ process to the user terminal. Send.
- a plurality of independent HARQ entities (HARQ entity 0 and HARQ entity 1) are configured by RRC for each cell.
- the total number of HARQ processes per cell is set to a maximum of 16 as before.
- the RRC may use two independent HARQ entities per cell as shown in FIG. 5B.
- each HARQ entity may manage up to eight HARQ processes. If each HARQ entity manages up to eight HARQ processes, the HARQ process numbers exist from HPN0 to HPN7.
- one DCI includes a 3-bit HARQ process number (HPN) field.
- HPN HARQ process number
- the transmission point TP0 sets a HARQ process from a maximum of eight HARQ processes managed by the HARQ entity 0, and stores the value of the HARQ process number corresponding to the HARQ process in the DCI format field. Mapping is performed and transmitted to the user terminal.
- the DCI format used here includes a 3-bit HARQ process number (HPN) field.
- the transmission point TP1 sets a HARQ process from a maximum of eight HARQ processes managed by the HARQ entity 1, maps the value of the HARQ process number corresponding to the HARQ process to the DCI field, and Send.
- each HARQ entity supports the same number of HARQ processes, but each HARQ entity may be configured to support a different number of HARQ processes. If each HARQ entity supports a different number of HARQ processes, the number of bits in the HARQ process number (HPN) field included in each corresponding DCI may be different.
- HPN HARQ process number
- TP meaning a transmission point refers to a panel, a transmission / reception point, a control resource set (CORESET) or a search space of the PDCCH, and a DMRS port group, a codeword or a transport block (TB) of the PDSCH. ) May be read.
- CORESET control resource set
- TB transport block
- “assumed 2” is configured to the user terminal by higher layer signaling (eg, RRC signaling), and information such as the number of HARQ entities per cell and the association between the HARQ entities and the transmission points is notified. You may. For example, when the configuration shown in FIG. 5A is notified, the user terminal operates assuming that two independent HARQ entities exist for each cell, and one DCI has a 4-bit HARQ process number (HPN). ) Works as if it contains a field.
- higher layer signaling eg, RRC signaling
- the user terminal monitors a plurality of downlink control channels (for example, PDCCH) or a plurality of downlink control information (for example, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 5A).
- PDCCH downlink control channels
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI.
- the DCI includes a 4-bit HARQ process number (HPN) field
- the user terminal specifies the HARQ process indicated by the DCI format and performs the HARQ process on the downlink transport block (TB).
- “assumed 2” is configured to the user terminal by higher layer signaling (eg, RRC signaling), and information such as the number of HARQ entities per cell and the association between the HARQ entities and the transmission points is notified. You may. For example, when the configuration shown in FIG. 5B is notified, the user terminal operates assuming that two independent HARQ entities exist for each cell, and one DCI has a 3-bit HARQ process number (HPN). ) Works as if it contains a field.
- higher layer signaling eg, RRC signaling
- the user terminal monitors a plurality of downlink control channels (for example, PDCCH) or a plurality of downlink control information (for example, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 5B).
- PDCCH downlink control channels
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI.
- the DCI includes a 3-bit HARQ process number (HPN) field
- the user terminal identifies the HARQ process indicated by the DCI format and performs the HARQ process on the downlink transport block (TB).
- the number of HARQ processes that each HARQ entity manages in parallel is variable and configured by RRC.
- Each HARQ entity may manage the same number of HARQ processes or different numbers of HARQ processes.
- FIG. 6 is a diagram illustrating an example of a configuration of a HARQ entity and an HARQ process according to Option 2 of the second example.
- the example illustrated in FIG. 6 is based on assumption 2: scheduling non-coherent PDSCHs transmitted from a plurality of transmission points, respectively, using a plurality of downlink control channels (for example, PDCCH) or a plurality of downlink control information (DCI). Control is assumed.
- a plurality of downlink control channels for example, PDCCH
- DCI downlink control information
- a plurality of independent HARQ entities (HARQ entity 0 and HARQ entity 1) are configured by RRC for each cell.
- Each HARQ entity is configured by RRC to manage the same number (16 in FIG. 6A) of HARQ processes in parallel.
- Multiple (up to 16) HARQ processes per HARQ entity are supported in one DCI. That is, one DCI includes a 4-bit HARQ process number (HPN) field.
- HPN 4-bit HARQ process number
- the RRC may use two independent HARQ entities per cell as shown in FIG. 6A.
- the RRC sets the number of HARQ processes managed by each HARQ entity.
- the transmission point TP0 sets a HARQ process from a maximum of 16 HARQ processes managed by the HARQ entity 0, and stores the value of the HARQ process number corresponding to the HARQ process in the DCI format field. Mapping is performed and transmitted to the user terminal.
- the DCI format used here includes a 4-bit HARQ process number (HPN) field.
- the transmission point TP1 sets a HARQ process from a maximum of 16 HARQ processes managed by the HARQ entity 1, maps the value of the HARQ process number corresponding to the HARQ process to the DCI field, and sends the HARQ process to the user terminal. Send.
- a plurality of independent HARQ entities are configured by RRC for each cell.
- Each HARQ entity is configured by the RRC to manage a different number of HARQ processes in parallel.
- HARQ entity 0 is configured to manage 16 HARQ processes in parallel.
- the corresponding DCI includes a 4-bit HARQ process number (HPN) field.
- HARQ entity 1 is configured to manage eight HARQ processes in parallel.
- the corresponding DCI includes a 3-bit HARQ process number (HPN) field.
- the RRC may use two independent HARQ entities per cell as shown in FIG. 6B.
- the RRC sets the number of HARQ processes managed by each HARQ entity.
- the transmission point TP0 sets a HARQ process from a maximum of 16 HARQ processes managed by the HARQ entity 0, and stores the value of the HARQ process number corresponding to the HARQ process in the DCI format field. Mapping is performed and transmitted to the user terminal.
- the DCI format used here includes a 4-bit HARQ process number (HPN) field.
- the transmission point TP1 sets a HARQ process from a maximum of eight HARQ processes managed by the HARQ entity 1, maps the value of the HARQ process number corresponding to the HARQ process to the DCI field, and transmits the DCI field to the user terminal.
- the DCI format used here includes a 3-bit HARQ process number (HPN) field.
- TP meaning a transmission point means a panel, a transmission / reception point, a control resource set (CORESET) or a search space of the PDCCH, and a DMRS port group, a codeword or a transport block (TB) of the PDSCH. ) May be read.
- CORESET control resource set
- TB transport block
- “assumed 2” is configured to the user terminal by higher layer signaling (eg, RRC signaling), and information such as the number of HARQ entities for each cell and the association between the HARQ entity and the transmission point is notified. You may. For example, when the configuration shown in FIG. 6A is notified, the user terminal operates assuming that there are two independent HARQ entities for each cell, and one DCI has a 4-bit HARQ process number (HPN). ) Works as if it contains a field.
- higher layer signaling eg, RRC signaling
- the user terminal monitors a plurality of downlink control channels (for example, PDCCH) or a plurality of downlink control information (for example, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 6A).
- PDCCH downlink control channels
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI.
- the DCI includes a 4-bit HARQ process number (HPN) field
- the user terminal specifies the HARQ process indicated by the DCI format and performs the HARQ process on the downlink transport block (TB).
- “assumed 2” is configured to the user terminal by higher layer signaling (eg, RRC signaling), and information such as the number of HARQ entities for each cell and the association between the HARQ entity and the transmission point is notified. You may. For example, when the configuration shown in FIG. 6B is notified, the user terminal operates assuming that there are two independent HARQ entities for each cell, and the DCI corresponding to HARQ entity 0 has a 4-bit HARQ. It operates on the assumption that the DCI corresponding to HARQ entity 1 includes a process number (HPN) field and includes a 3-bit HARQ process number (HPN) field.
- HPN process number
- HPN 3-bit HARQ process number
- the user terminal monitors a plurality of downlink control channels (for example, PDCCH) or a plurality of downlink control information (for example, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 6B), respectively.
- PDCCH downlink control channels
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI.
- the user terminal assuming that the DCI includes a 4-bit or 3-bit HARQ process number (HPN) field, specifies the HARQ process indicated by the DCI format, and specifies the HARQ process for the downlink transport block (TB). Do the process.
- HPN 4-bit or 3-bit HARQ process number
- the HARQ process number associated with each HARQ entity is configured by RRC.
- FIG. 7 is a diagram illustrating an example of a configuration of a HARQ entity and a HARQ process according to Option 3 of the second example.
- the example shown in FIG. 7 is based on assumption 1: scheduling PDSCHs transmitted from a plurality of transmission points, respectively, using a single downlink control channel (eg, PDCCH) or a single downlink control information (eg, DCI). It is assumed that the control is performed by using this.
- a single downlink control channel eg, PDCCH
- a single downlink control information eg, DCI
- a plurality of independent HARQ entities (HARQ entity 0 and HARQ entity 1) are configured by RRC for each cell.
- the total number of HARQ processes per cell is set to a maximum of 16 as before.
- the RRC may use two independent HARQ entities per cell as shown in FIG. Set.
- each HARQ entity may manage up to eight HARQ processes.
- one DCI includes a 4-bit HARQ process number (HPN) field.
- HPN HARQ process number
- the HARQ process numbers of up to eight HARQ processes managed by the HARQ entity 0 by RRC are configured from HPN0 to HPN7.
- the HARQ process numbers of up to eight HARQ processes managed by the HARQ entity 1 by RRC are configured from HPN8 to HPN15.
- the transmission point TP0 sets a HARQ process from a maximum of eight HARQ processes managed by the HARQ entity 0, and sets the value of the HARQ process number corresponding to this HARQ process (any of HPN0 to HPN7). Is mapped to the DCI format field and transmitted to the user terminal.
- the DCI format used here includes a 4-bit HARQ process number (HPN) field.
- the transmission point TP1 sets a HARQ process from a maximum of eight HARQ processes managed by the HARQ entity 1, and sets the value of the HARQ process number (one of HPN8 to HPN15) corresponding to the HARQ process to the DCI field. And sends it to the user terminal.
- each HARQ entity supports the same number of HARQ processes, but each HARQ entity may be configured to support a different number of HARQ processes.
- TP meaning a transmission point means a panel, a transmission / reception point, a PDCCH control resource set (CORESET) or a search space, and a PDSCH DMRS port group, a codeword or a transport block (TB). ) May be read.
- CORESET PDCCH control resource set
- TB transport block
- “assumed 1” is configured to the user terminal by higher layer signaling (eg, RRC signaling), and information such as the number of HARQ entities for each cell and the association between the HARQ entity and the transmission point is notified. You may. For example, when the configuration shown in FIG. 7 is notified, the user terminal operates assuming that two independent HARQ entities exist for each cell, and one DCI has a 4-bit HARQ process number (HPN). ) Works as if it contains a field.
- higher layer signaling eg, RRC signaling
- the user terminal monitors a single downlink control channel (eg, PDCCH) or a single downlink control information (eg, DCI) transmitted from a plurality of transmission points (TP0 and TP1 in FIG. 7), respectively. I do.
- PDCCH physical downlink control channel
- DCI downlink control information
- the user terminal decodes the corresponding PDSCH indicated by the DCI. Assuming that the DCI includes a 4-bit HARQ process number (HPN) field, the user terminal specifies the HARQ process indicated by the DCI format and performs the HARQ process on the downlink transport block (TB). .
- HPN 4-bit HARQ process number
- the configuration (option 3) in which the HARQ process number associated with each HARQ entity is configured by RRC may be switched to option 1 or option 2 by higher layer signaling, or may be operated in combination.
- a PDSCH for example, a PDSCH using NCJT
- a PDSCH using NCJT a PDSCH using NCJT
- Wireless communication system Wireless communication system
- the configuration of the wireless communication system according to the present embodiment will be described.
- the wireless communication method according to the above embodiment is applied.
- FIG. 8 is a diagram showing an example of a schematic configuration of the wireless communication system according to the present embodiment.
- carrier aggregation or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit is applied.
- the wireless communication system 1 may be referred to as SUPER @ 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (New Rat), or the like.
- the radio communication system 1 illustrated in FIG. 8 includes a radio base station 11 forming a macro cell C1, and radio base stations 12a to 12c arranged in the macro cell C1 and forming a small cell C2 smaller than the macro cell C1. I have.
- User terminals 20 are arranged in the macro cell C1 and each small cell C2. A configuration in which different numerology is applied between cells may be adopted. Numerology refers to a signal design in a certain RAT and a set of communication parameters that characterize the RAT design.
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 using different frequencies simultaneously by CA or DC.
- the user terminal 20 can apply CA or DC using a plurality of cells (CCs) (for example, two or more CCs).
- CCs cells
- the user terminal can use the licensed band CC and the unlicensed band CC as a plurality of cells.
- a configuration in which a TDD carrier to which the shortened TTI is applied is included in any of a plurality of cells may be employed.
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (eg, 2 GHz) and a narrow bandwidth (existing carrier, called Legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, 30 to 70 GHz, or the like
- a wide bandwidth may be used between the user terminal 20 and the radio base station 12, or the radio base station. 11, the same carrier may be used.
- the configuration of the frequency band used by each wireless base station is not limited to this.
- the wireless base station 11 and the wireless base station 12 may be connected by a wired connection (for example, an optical fiber compliant with CPRI (Common Public Radio Interface) or an X2 interface) or wireless. It can be configured to be connected.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface) or an X2 interface
- CPRI Common Public Radio Interface
- X2 interface X2 interface
- the radio base station 11 and each radio base station 12 are connected to the upper station device 30 and connected to the core network 40 via the upper station device 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each wireless base station 12 may be connected to the higher station apparatus 30 via the wireless base station 11.
- the wireless base station 11 is a wireless base station having relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, and the like.
- the radio base station 12 is a radio base station having local coverage, such as a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), a transmission / reception point, and the like. May be called.
- the wireless base stations 11 and 12 are not distinguished, they are collectively referred to as a wireless base station 10.
- Each user terminal 20 is a terminal corresponding to various communication systems such as LTE and LTE-A, and may include not only mobile communication terminals but also fixed communication terminals.
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), and data is mapped to each subcarrier to perform communication.
- SC-FDMA is a single-carrier transmission scheme that divides a system bandwidth into bands each composed of one or a continuous resource block for each terminal, and reduces interference between terminals by using different bands from each other. is there.
- the uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in UL.
- downlink data channels Physical Downlink Shared Channel, also referred to as downlink shared channels
- broadcast channels PBCH: Physical Broadcast Channel
- L1 / L2 shared by each user terminal 20 are used.
- a control channel or the like is used.
- the PDSCH transmits user data, higher layer control information, SIB (System Information Block), and the like.
- SIB System Information Block
- MIB Master Information Block
- the L1 / L2 control channels include downlink control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like.
- Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
- DCI Downlink Control Information
- PCFICH Physical OFDM symbols used for PDCCH is transmitted.
- HARQ transmission acknowledgment information (ACK / NACK) for PUSCH is transmitted by PHICH.
- EPDCCH is frequency-division multiplexed with PDSCH (Downlink Shared Data Channel) and used for transmission of DCI and the like like PDCCH.
- an uplink data channel (PUSCH: Physical Uplink Shared Channel, also referred to as an uplink shared channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), random An access channel (PRACH: Physical @ Random @ Access @ Channel) or the like is used.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical @ Random @ Access @ Channel
- User data and higher layer control information are transmitted by PUSCH.
- Uplink control information (UCI: Uplink Control Information) including at least one of acknowledgment information (ACK / NACK) and radio quality information (CQI) is transmitted by PUSCH or PUCCH.
- the PRACH transmits a random access preamble for establishing a connection with a cell.
- FIG. 9 is a diagram showing an example of the overall configuration of the radio base station according to the present embodiment.
- the wireless base station 10 includes a plurality of transmitting / receiving antennas 101, an amplifier unit 102, a transmitting / receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
- the transmitting / receiving antenna 101, the amplifier unit 102, and the transmitting / receiving unit 103 may be configured to include at least one each.
- the radio base station 10 is a transmitting device for downlink data and may be a receiving device for uplink data.
- ⁇ ⁇ Downlink data transmitted from the radio base station 10 to the user terminal 20 is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- the baseband signal processing unit 104 regarding downlink data, processing of a PDCP (Packet Data Convergence Protocol) layer, division / combination of user data, transmission processing of an RLC layer such as RLC (Radio Link Control) retransmission control, MAC (Medium Access) Control)
- the transmission / reception unit performs transmission processing such as retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing.
- retransmission control for example, HARQ transmission processing
- IFFT inverse fast Fourier transform
- precoding processing for example, HARQ transmission processing
- the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
- the transmission / reception section 103 converts the baseband signal precoded and output from the baseband signal processing section 104 for each antenna into a radio frequency band, and transmits the radio frequency band.
- the radio frequency signal frequency-converted by the transmitting / receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting / receiving antenna 101.
- the transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.
- the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
- the transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. Transmitting / receiving section 103 frequency-converts the received signal into a baseband signal and outputs the baseband signal to baseband signal processing section 104.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT: Fast Fourier Transform), inverse discrete Fourier transform (IDFT), and error correction on user data included in the input uplink signal. Decoding, reception processing of MAC retransmission control, reception processing of the RLC layer and PDCP layer are performed, and the data is transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as setting and release of a communication channel, state management of the wireless base station 10, and management of wireless resources.
- the transmission path interface 106 transmits and receives signals to and from the higher-level station device 30 via a predetermined interface.
- the transmission path interface 106 also transmits and receives signals (backhaul signaling) with other wireless base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). Good.
- CPRI Common Public Radio Interface
- X2 interface X2 interface
- Transceiver 103 may further include an analog beamforming unit that performs analog beamforming.
- the analog beam forming unit includes an analog beam forming circuit (for example, a phase shifter, a phase shift circuit) or an analog beam forming device (for example, a phase shifter) described based on common recognition in the technical field according to the present invention. can do.
- the transmitting / receiving antenna 101 can be configured by, for example, an array antenna.
- the transmission / reception unit 103 is configured to be able to apply single BF and multi BF.
- Transceiving section 103 may transmit a signal using a transmission beam or may receive a signal using a reception beam.
- the transmission / reception unit 103 may transmit and receive a signal using a predetermined beam determined by the control unit 301.
- the transmitting / receiving section 103 includes a downlink signal (for example, a downlink control signal (downlink control channel), a downlink data signal (downlink data channel, downlink shared channel), a downlink reference signal (DM-RS, CSI-RS, etc.), a discovery signal, a synchronization signal, Signals, broadcast signals, etc.).
- the transmitting / receiving section 103 receives an uplink signal (for example, an uplink control signal (uplink control channel), an uplink data signal (uplink data channel, uplink shared channel), an uplink reference signal, and the like).
- the transmission / reception unit 103 transmits one or a plurality of pieces of downlink control information used for scheduling of a downlink shared channel transmitted from a plurality of transmission points.
- the HARQ process number (HPN) field included in the downlink control information an HARQ process number managed by one or a plurality of independent HARQ entities is mapped for each cell.
- the transmitting unit and the receiving unit of the present invention are configured by both or any one of the transmitting and receiving unit 103 and the transmission line interface 106.
- FIG. 10 is a diagram showing an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 10 mainly shows functional blocks of characteristic portions in the present embodiment, and it is assumed that the wireless base station 10 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 104 includes at least a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.
- the control unit 301 controls the entire wireless base station 10.
- the control unit 301 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the control unit 301 controls, for example, generation of a signal by the transmission signal generation unit 302 and allocation of a signal by the mapping unit 303.
- the control unit 301 controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.
- Control section 301 controls scheduling of downlink signals and uplink signals (for example, resource allocation). Specifically, control section 301 transmits and generates DCI (DL assignment, DL grant) including scheduling information of the downlink data channel and DCI (UL grant) including scheduling information of the uplink data channel. It controls the signal generation unit 302, the mapping unit 303, and the transmission / reception unit 103.
- DCI DL assignment, DL grant
- UL grant DCI
- the control unit 301 may control transmission or reception of control information and data in multi-slot aggregation and preemption.
- the transmission signal generation unit 302 generates a downlink signal (a downlink control channel, a downlink data channel, a downlink reference signal such as a DM-RS, etc.) based on an instruction from the control unit 301, and outputs the downlink signal to the mapping unit 303.
- the transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- Mapping section 303 maps the downlink signal generated by transmission signal generating section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs it to transmitting / receiving section 103.
- the mapping unit 303 can be composed of a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- Reception signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from transmission / reception section 103.
- the received signal is an uplink signal (uplink control channel, uplink data channel, uplink reference signal, etc.) transmitted from the user terminal 20.
- the reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301.
- the reception processing unit 304 outputs at least one of a preamble, control information, and UL data to the control unit 301.
- reception signal processing section 304 outputs the reception signal and the signal after the reception processing to measurement section 305.
- the measurement unit 305 performs measurement on the received signal.
- the measurement unit 305 can be configured by a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present invention.
- the measurement unit 305 may measure, for example, the reception power (for example, RSRP (Reference Signal Received Power)), the reception quality (for example, RSRQ (Reference Signal Received Quality)) of the received signal, the channel state, and the like.
- the measurement result may be output to the control unit 301.
- FIG. 11 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment.
- the user terminal 20 includes a plurality of transmitting / receiving antennas 201, an amplifier unit 202, a transmitting / receiving unit 203, a baseband signal processing unit 204, and an application unit 205.
- the transmitting / receiving antenna 201, the amplifier unit 202, and the transmitting / receiving unit 203 may be configured to include at least one each.
- the user terminal 20 is a receiving device for downlink data and may be a transmitting device for uplink data.
- the radio frequency signal received by the transmitting / receiving antenna 201 is amplified by the amplifier unit 202.
- the transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202.
- the transmission / reception section 203 converts the frequency of the received signal into a baseband signal, and outputs the baseband signal to the baseband signal processing section 204.
- the transmission / reception unit 203 can be composed of a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the transmission / reception unit 203 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, reception processing of retransmission control, and the like on the input baseband signal.
- the downlink data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Of the downlink data, system information and higher layer control information are also transferred to the application unit 205.
- the uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processor 204 performs retransmission control transmission processing (eg, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like, and performs transmission and reception.
- the data is transferred to the unit 203.
- the transmitting / receiving section 203 converts the baseband signal output from the baseband signal processing section 204 into a radio frequency band and transmits the radio frequency band.
- the radio frequency signal frequency-converted by the transmitting / receiving section 203 is amplified by the amplifier section 202 and transmitted from the transmitting / receiving antenna 201.
- the transmission / reception unit 203 may further include an analog beamforming unit that performs analog beamforming.
- the analog beam forming unit includes an analog beam forming circuit (for example, a phase shifter, a phase shift circuit) or an analog beam forming device (for example, a phase shifter) described based on common recognition in the technical field according to the present invention. can do.
- the transmitting / receiving antenna 201 can be configured by, for example, an array antenna.
- the transmission / reception unit 203 is configured to be able to apply single BF and multi BF.
- the transmission / reception unit 203 may transmit a signal using a transmission beam or may receive a signal using a reception beam.
- the transmitting / receiving section 203 may transmit and receive signals using a predetermined beam determined by the control section 401.
- the transmitting / receiving section 203 includes a downlink signal (for example, a downlink control signal (downlink control channel), a downlink data signal (downlink data channel, downlink shared channel), a downlink reference signal (DM-RS, CSI-RS, etc.), a discovery signal, a synchronization signal, Signal, annunciation signal, etc.).
- the transmitting / receiving section 203 transmits an uplink signal (eg, an uplink control signal (uplink control channel), an uplink data signal (uplink data channel, uplink shared channel), an uplink reference signal, and the like).
- the transmission / reception unit 203 receives one or a plurality of pieces of downlink control information used for scheduling of a downlink shared channel transmitted from a plurality of transmission points.
- the HARQ process number (HPN) field included in the downlink control information an HARQ process number managed by one or a plurality of independent HARQ entities is mapped for each cell.
- the transmission / reception unit 203 transmits HARQ-ACK information corresponding to the HARQ process number.
- FIG. 12 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment.
- FIG. 12 mainly shows functional blocks of characteristic portions in the present embodiment, and it is assumed that user terminal 20 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 204 of the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. I have at least.
- the control unit 401 controls the entire user terminal 20.
- the control unit 401 can be configured by a controller, a control circuit, or a control device that is described based on common recognition in the technical field according to the present invention.
- the control unit 401 controls, for example, generation of a signal by the transmission signal generation unit 402 and assignment of a signal by the mapping unit 403.
- the control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.
- the control unit 401 may detect the HARQ process number indicated by the HARQ process number (HPN) field included in the downlink control information, and control to transmit the HARQ-ACK information corresponding to the HARQ process number.
- HPN HARQ process number
- Transmission signal generation section 402 generates an uplink signal (uplink control channel, uplink data channel, uplink reference signal, etc.) based on an instruction from control section 401 and outputs the generated signal to mapping section 403.
- the transmission signal generation unit 402 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- Transmission signal generation section 402 generates an uplink data channel based on an instruction from control section 401. For example, when the UL grant is included in the downlink control channel notified from the radio base station 10, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data channel.
- Mapping section 403 maps the uplink signal generated by transmission signal generation section 402 to a radio resource based on an instruction from control section 401, and outputs the result to transmission / reception section 203.
- the mapping unit 403 can be configured with a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- Reception signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from transmission / reception section 203.
- the received signal is a downlink signal (a downlink control channel, a downlink data channel, a downlink reference signal, etc.) transmitted from the radio base station 10.
- the reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the received signal processing unit 404 performs blind decoding on the downlink control channel for scheduling transmission and reception of the downlink data channel based on the instruction of the control unit 401, and performs reception processing of the downlink data channel based on the DCI.
- Received signal processing section 404 estimates a channel gain based on DM-RS or CRS, and demodulates a downlink data channel based on the estimated channel gain.
- the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
- the reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401.
- the reception signal processing unit 404 may output the data decoding result to the control unit 401.
- the reception signal processing unit 404 outputs the reception signal and the signal after the reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement unit 405 can be configured by a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present invention.
- Measurement section 405 may measure, for example, the received power (eg, RSRP), DL reception quality (eg, RSRQ), channel state, and the like of the received signal.
- the measurement result may be output to the control unit 401.
- each functional block (configuration units) are realized by an arbitrary 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 realized using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated from each other). , Wired, wireless, etc.) and using these multiple devices.
- the functional block may be realized by combining one device or the plurality of devices with software.
- the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (configuration unit) that causes transmission to function may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the realization method is not particularly limited.
- a base station, a user terminal, and the like may function as a computer that performs processing of the wireless communication method according to the present disclosure.
- FIG. 13 is a diagram illustrating an example of a hardware configuration of the base station and the user terminal according to the embodiment.
- the above-described base station 10 and user terminal 20 may be physically 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, a device, a unit, or the like.
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices illustrated in the drawing, or may be configured to exclude some of the devices.
- processor 1001 may be implemented by one or more chips.
- the functions of the base station 10 and the user terminal 20 are performed by, for example, reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002 so that the processor 1001 performs an arithmetic operation and communicates via the communication device 1004. And controlling at least one of data reading and writing in the memory 1002 and the storage 1003.
- predetermined software program
- the processor 1001 performs an arithmetic operation and communicates via the communication device 1004.
- the processor 1001 controls an entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
- CPU Central Processing Unit
- the above-described baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001.
- the processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to these.
- a program program code
- a program that causes a computer to execute at least a part of the operation described in the above embodiment is used.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and other functional blocks may be similarly realized.
- the memory 1002 is a computer-readable recording medium, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), and other appropriate storage media. It may be constituted by one.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc) ROM, etc.), a digital versatile disc, Blu-ray® disks), removable disks, hard disk drives, smart cards, flash memory devices (eg, cards, sticks, key drives), magnetic stripes, databases, servers, and / or other suitable storage media May be configured.
- the storage 1003 may be called an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). May be configured.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission line interface 106, and the like described above may be realized by the communication device 1004.
- the transmission / reception unit 103 may be physically or logically separated by the transmission unit 103a and the reception unit 103b.
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an external input.
- the output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, and the like).
- the input device 1005 and the output device 1006 may have an integrated configuration (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 a different bus for each device.
- the base station 10 and the user terminal 20 include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured so as to include some or all of the functional blocks using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.
- DSP digital signal processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- At least one of the channel and the symbol may be a signal (signaling).
- the signal may be a message.
- the reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like according to an applied standard.
- RS Reference Signal
- a component carrier CC: Component Carrier
- the radio frame may be configured by one or more periods (frames) in the time domain.
- the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- a subframe may be configured by one or more slots in the time domain.
- a subframe may be of a fixed length of time (eg, 1 ms) that does not depend on numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- SCS SubCarrier @ Spacing
- bandwidth For example, subcarrier interval (SCS: SubCarrier @ Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission @ Time @ Interval), number of symbols per TTI, radio frame configuration, transceiver in frequency domain
- TTI Transmission @ Time @ Interval
- number of symbols per TTI radio frame configuration
- transceiver in frequency domain At least one of a specific filtering process to be performed, a specific windowing process performed by the transceiver in the time domain, and the like may be indicated.
- the slot may be configured by one or more symbols (OFDM (Orthogonal Frequency Divide Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Frequency Division Multiple Access) symbol, etc.) in the time domain.
- a slot may be a time unit based on pneumatics.
- the slot may include a plurality of mini slots. Each minislot may be constituted by one or more symbols in the time domain. Mini-slots may be referred to as sub-slots. A minislot may be made up of a smaller number of symbols than slots.
- a PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (PUSCH) mapping type A.
- a PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (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 use different names corresponding to each.
- one subframe may be called a transmission time interval (TTI)
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- TTI slot or one minislot
- You may. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1 to 13 symbols), or a period longer than 1 ms. It may be.
- the unit representing the TTI may be called a slot, a minislot, or the like instead of a subframe.
- the TTI refers to, for example, a minimum time unit of scheduling in wireless communication.
- the base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) to each user terminal in TTI units.
- the definition of TTI is not limited to this.
- the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, a code word, or a processing unit such as scheduling and link adaptation.
- a transmission time unit such as a channel-encoded data packet (transport block), a code block, a code word, or a processing unit such as scheduling and link adaptation.
- a time interval for example, the number of symbols
- a transport block, a code block, a codeword, and the like may be shorter than the TTI.
- one slot or one minislot is called a TTI
- one or more TTIs may be the minimum time unit for scheduling.
- the number of slots (mini-slot number) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE@Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, and the like.
- a TTI shorter than the normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- a long TTI (eg, a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (eg, a shortened TTI, etc.) may be replaced with a TTI that is less than the TTI length of the long TTI and 1 ms or more.
- the TTI having the TTI length may be read.
- the resource block (RB: Resource Block) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain.
- the RB may include one or more symbols in the time domain, and may be one slot, one minislot, one subframe, or one TTI in length.
- One TTI and one subframe may be configured by one or more resource blocks, respectively.
- One or more RBs are called a physical resource block (PRB: Physical @ RB), a subcarrier group (SCG: Sub-Carrier @ Group), a resource element group (REG: Resource @ Element @ Group), a PRB pair, an RB pair, and the like. You may.
- PRB Physical @ RB
- SCG Sub-Carrier @ Group
- REG Resource @ Element @ Group
- PRB pair an RB pair, and the like.
- the resource block may be configured by one or more resource elements (RE: Resource : Element).
- RE Resource : Element
- one RE may be a radio resource area of one subcarrier and one symbol.
- the structures of the above-described radio frames, subframes, slots, minislots, symbols, and the like are merely 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, included in an RB The configuration of the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic @ Prefix) length, and the like can be variously changed.
- Information, parameters, and the like described in the present disclosure may be expressed using an absolute value, may be expressed using a relative value from a predetermined value, or may be expressed using another corresponding information. You may. For example, a radio resource may be indicated by a predetermined index.
- Names used for parameters and the like in the present disclosure are not limited in any way. Further, the formulas and the like using these parameters may be different from those explicitly disclosed in the present disclosure.
- the various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so the various names assigned to these various channels and information elements Is not a limiting name in any way.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are not limited to voltages, currents, electromagnetic waves, magnetic or magnetic particles, light fields or photons, or any of these. May be represented by a combination of
- Information, signals, and the like can be output from the upper layer to at least one of the lower layer and the lower layer to the upper layer.
- Information, signals, and the like may be input and output via a plurality of network nodes.
- Information and signals input and output may be stored in a specific place (for example, a memory) or may be managed using a management table. Information and signals that are input and output can be overwritten, updated, or added. The output information, signal, and the like may be deleted. The input information, signal, and the like may be transmitted to another device.
- Notification of information is not limited to the aspect / embodiment described in the present disclosure, and may be performed using another method.
- the information is notified by physical layer signaling (for example, downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, It may be implemented by broadcast information (Master Information Block (MIB: Master Information Block), system information block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- Physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like.
- the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- MAC signaling may be notified using, for example, a MAC control element (MAC @ CE (Control @ Element)).
- the notification of the predetermined information is not limited to an explicit notification, and is implicit (for example, by not performing the notification of the predetermined information or notifying of another information). ).
- the determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be performed by comparing numerical values (for example, comparison with a predetermined value).
- Software, instructions, information, etc. may be transmitted and received via transmission media.
- the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), When transmitted from a server or other remote source, at least one of these wired and / or wireless technologies is included within the definition of a transmission medium.
- wired technology coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wireless technology infrared, microwave, etc.
- system and “network” may be used interchangeably.
- precoding In the present disclosure, “precoding”, “precoder”, “weight (precoding weight)”, “pseudo collocation (QCL: Quasi-Co-Location)”, “transmission power”, “phase rotation”, “antenna port” , “Antenna port group”, “layer”, “number of layers”, “rank”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel”, etc. The terms may be used interchangeably.
- base station (BS: Base @ Station)”, “wireless base station”, “fixed station (fixed @ station)”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “ “Access point”, “transmission point”, “reception point”, “transmission / reception point”, “cell”, “sector”, “cell group”, Terms such as “carrier”, “component carrier”, “Bandwidth Part (BWP)” may be used interchangeably.
- a base station may be referred to by a term such as a macro cell, a small cell, a femto cell, a pico cell, and the like.
- a base station can accommodate one or more (eg, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH: Communication services can also be provided by Remote Radio ⁇ Head)).
- a base station subsystem eg, a small indoor base station (RRH: Communication services can also be provided by Remote Radio ⁇ Head).
- RRH small indoor base station
- the term "cell” or “sector” refers to a part or the entire coverage area of at least one of a base station and a base station subsystem that provide communication services in this coverage.
- MS mobile station
- UE user equipment
- terminal terminal
- a mobile station is 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 terminal, remote terminal. , Handset, user agent, mobile client, client or some other suitable terminology.
- At least one of the base station and the 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 the mobile unit, the mobile unit itself, or the like.
- the moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (maned or unmanned). ).
- At least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation.
- at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be replaced with a user terminal.
- communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- each aspect / embodiment of the present disclosure may be applied.
- the configuration may be such that the user terminal 20 has the function of the base station 10 described above.
- Words such as “up” and “down” may be read as words corresponding to communication between terminals (for example, “side”).
- an uplink channel, a downlink channel, and the like may be replaced with a side channel.
- the user terminal in the present disclosure may be replaced with a base station.
- the base station 10 may have the function of the user terminal 20 described above.
- an operation performed by the base station may be performed by an upper node (upper node) in some cases.
- various operations performed for communication with a terminal include a base station, one or more network nodes other than the base station (eg, Obviously, it can be performed by MME (Mobility Management ⁇ Entity), S-GW (Serving-Gateway) or the like, but not limited thereto, or a combination thereof.
- MME Mobility Management ⁇ Entity
- S-GW Serving-Gateway
- Each aspect / embodiment described in the present disclosure may be used alone, may be used in combination, or may be switched and used in execution. Further, the processing procedure, sequence, flowchart, and the like of each aspect / embodiment described in the present disclosure may be interchanged as long as there is no inconsistency. For example, for the methods described in this disclosure, elements of the various steps are presented in an exemplary order, and are not limited to the specific order presented.
- LTE Long Term Evolution
- LTE-A Long Term Evolution
- LTE-B Long Term Evolution-Beyond
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication
- system 5G (5th generation mobile communication system)
- FRA Fluture Radio Access
- New-RAT Radio Access Technology
- NR New Radio
- NX New radio access
- FX Fluture generation radio access
- GSM Registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi (registered trademark)
- IEEE 802.16 WiMAX (registered trademark)
- UWB Ultra-WideBand
- Bluetooth registered trademark
- a system using other suitable wireless communication methods and a next-generation system extended based on these methods.
- a plurality of systems may be combined (for example, a combination of LTE or LTE-A and 5G) and applied.
- any reference to elements using "first,” “second,” etc., as used in this disclosure, does not generally limit the quantity or order of those elements. These designations may be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not mean that only two elements can be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “judgment” means judging, calculating, computing, processing, deriving, investigating, searching (up, search, inquiry) ( For example, a search in a table, database, or another data structure), ascertaining, etc., may be considered to be “determining.”
- Determining includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, and accessing. (E.g., accessing data in a memory) or the like may be considered to be “determining (determining)."
- “Judgment (decision)” may be regarded as “judgment (decision)” of resolving, selecting, choosing, establishing, comparing, and the like. . That is, “judgment (decision)” may be regarded as “judgment (decision)” of any operation.
- the “maximum transmission power” described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal maximum transmission power (the nominal UE maximum transmit power), or may refer to the rated maximum transmission power (the rated UE maximum transmit power).
- connection refers to any direct or indirect connection or coupling between two or more elements. And may include the presence of one or more intermediate elements between two elements “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”.
- the radio frequency domain, microwave It can be considered “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the region, the light (both visible and invisible) regions, and the like.
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Abstract
Description
第1の態様では、複数の送信ポイントからPDSCH(たとえば、NCJTを利用したPDSCH)が送信されるシナリオにおいて、セルごとのHARQエンティティを維持するようユーザ端末に対して構成する。
オプション1では、HARQエンティティごとに、並行して管理するHARQプロセスの数は従来と変わらない。すなわち、HARQエンティティごとに、最大16個のHARQプロセスが並行して管理される。
オプション2では、HARQエンティティごとにサポートされるHARQプロセスの数は、PDCCH、PDSCH、パネルまたは送受信ポイントの数とともに線形に増加する。すなわち、PDCCH、PDSCH、パネルまたは送受信ポイントの数などに基づいて、HARQエンティティごとに並行して管理されるHARQプロセスの最大数は変化する。
第2の態様では、複数の送信ポイントからPDSCH(たとえば、NCJTを利用したPDSCH)が送信されるシナリオにおいて、複数の送信ポイントに対応してセルごとのHARQエンティティをユーザ端末に対して別個に構成する。
オプション1では、各HARQエンティティが並行して管理するHARQプロセスの数は固定される。たとえば、HARQエンティティごとに、並行して管理されるHARQプロセスの数は従来と変わらず、最大16個であってもよい。あるいは、セルごとのHARQプロセスの総数は従来と変わらず、最大16個であってもよい。後者の場合、HARQエンティティごとに並行して管理されるHARQプロセスの数は、従来よりも削減される。
オプション2では、各HARQエンティティが並行して管理するHARQプロセスの数は、可変であり、RRCによって構成される。各HARQエンティティは、同じ数のHARQプロセスを管理してもよいし、異なる数のHARQプロセスを管理してもよい。
オプション3では、各HARQエンティティに関連するHARQプロセス番号が、RRCによって構成される。
以下、本実施の形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上記実施の形態に係る無線通信方法が適用される。
図9は、本実施の形態に係る無線基地局の全体構成の一例を示す図である。無線基地局10は、複数の送受信アンテナ101と、アンプ部102と、送受信部103と、ベースバンド信号処理部104と、呼処理部105と、伝送路インターフェース106と、を備えている。送受信アンテナ101、アンプ部102、送受信部103は、それぞれ1つ以上を含むように構成されればよい。無線基地局10は、下りデータの送信装置であり、上りデータの受信装置であってもよい。
図11は、本実施の形態に係るユーザ端末の全体構成の一例を示す図である。ユーザ端末20は、複数の送受信アンテナ201と、アンプ部202と、送受信部203と、ベースバンド信号処理部204と、アプリケーション部205と、を備えている。送受信アンテナ201、アンプ部202、送受信部203は、それぞれ1つ以上を含むように構成されればよい。ユーザ端末20は、下りデータの受信装置であり、上りデータの送信装置であってもよい。
上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェアおよびソフトウェアの少なくとも一方の任意の組み合わせによって実現される。各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的または論理的に結合した1つの装置を用いて実現されてもよいし、物理的または論理的に分離した2つ以上の装置を直接的または間接的に(たとえば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置または上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
本開示において説明した用語および本開示の理解に必要な用語については、同一のまたは類似する意味を有する用語と置き換えてもよい。たとえば、チャネルおよびシンボルの少なくとも一方は信号(シグナリング)であってもよい。信号はメッセージであってもよい。参照信号は、RS(Reference Signal)と略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。コンポーネントキャリア(CC:Component Carrier)は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- 複数の送信ポイントから送信される下り共有チャネルのスケジューリングに利用される1以上の下り制御情報を、下り制御チャネルをモニタして受信する受信部と、
前記下り制御情報に含まれるHARQ(ハイブリッド自動再送要求:Hybrid Automatic Repeat Request)プロセス番号フィールドが示す、セルごとに1以上の独立したHARQエンティティが管理するHARQプロセス番号を検出する制御部と、を有することを特徴とするユーザ端末。 - 前記受信部は、1つの前記下り制御情報を受信し、
前記1つの下り制御情報に含まれるHARQプロセス番号フィールドには、セルごとに1つの独立したHARQエンティティが管理するHARQプロセス番号がマッピングされることを特徴とする請求項1に記載のユーザ端末。 - 前記受信部は、複数の前記下り制御情報を受信し、
前記各下り制御情報に含まれるHARQプロセス番号フィールドには、セルごとに1つの独立したHARQエンティティが管理するHARQプロセス番号がマッピングされることを特徴とする請求項1に記載のユーザ端末。 - 前記受信部は、複数の前記下り制御情報を受信し、
前記各下り制御情報に含まれるHARQプロセス番号フィールドには、セルごとに複数の独立したHARQエンティティが管理するHARQプロセス番号がそれぞれマッピングされることを特徴とする請求項1に記載のユーザ端末。 - 前記制御部は、前記HARQエンティティごとに管理可能なHARQプロセスの最大数に関する前記ユーザ端末の能力に関する情報を示すよう制御することを特徴とする請求項1から請求項3のいずれかに記載のユーザ端末。
- 前記制御部は、前記送信ポイントごとに設定可能な前記HARQエンティティの最大数に関する前記ユーザ端末の能力に関する情報を示すよう制御することを特徴とする請求項1または請求項4に記載のユーザ端末。
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