WO2017051717A1 - ユーザ端末、無線基地局及び無線通信方法 - Google Patents
ユーザ端末、無線基地局及び無線通信方法 Download PDFInfo
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- WO2017051717A1 WO2017051717A1 PCT/JP2016/076486 JP2016076486W WO2017051717A1 WO 2017051717 A1 WO2017051717 A1 WO 2017051717A1 JP 2016076486 W JP2016076486 W JP 2016076486W WO 2017051717 A1 WO2017051717 A1 WO 2017051717A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0078—Timing of allocation
- H04L5/0082—Timing of allocation at predetermined intervals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
Definitions
- the present invention relates to a user terminal, a radio base station, and a radio communication method in a next-generation mobile communication system.
- LTE Long Term Evolution
- LTE-A also referred to as LTE Advanced, LTE Rel. 10, 11 or 12
- LTE Long Term Evolution
- Successor systems for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), LTE Rel.13, etc.
- FRA Full Radio Access
- 5G 5th generation mobile communication system
- LTE-A employs carrier aggregation (CA) that performs communication using a plurality of carriers simultaneously with a predetermined bandwidth (maximum 20 MHz) as a basic unit.
- CA carrier aggregation
- a carrier that is a basic unit in carrier aggregation is referred to as a component carrier (CC), for example, LTE Rel. This corresponds to 8 system bands.
- PCell Primary Cell
- SCell Secondary Cell
- the UE can connect to PCell first and add SCell as needed.
- the PCell is a cell similar to a single cell (stand-alone cell) that supports RLM (Radio Link Monitoring), SPS (Semi-Persistent Scheduling), and the like.
- the SCell is a cell set for the UE in addition to the PCell.
- the SCell is a cell that can be communicated (scheduled) for the first time after being activated because it is in an inactive state immediately after being added to the user terminal.
- the license band for example, 800 MHz, 2 GHz, 1.7 GHz band and the like are used.
- the unlicensed band for example, the same 2.4 GHz, 5 GHz band as Wi-Fi (registered trademark) is used.
- LTE Rel. 13 considers carrier aggregation (LAA: License-Assisted Access) between licensed and unlicensed bands, but will also consider dual connectivity (DC) and unlicensed band stand-alone in the future. May be eligible.
- LAA License-Assisted Access
- DC dual connectivity
- HARQ Hybrid Automatic Repeat reQuest
- a user terminal or radio base station feeds back a delivery confirmation signal (also referred to as HARQ-ACK, ACK / NACK, A / N) related to the data at a predetermined timing according to the data reception result.
- the radio base station or user terminal controls data retransmission based on the fed back HARQ-ACK.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- the bit size (also referred to as codebook size or bit string size) of ACK / NACK fed back by the user terminal is semi-statically preliminarily transmitted from the radio base station by higher layer signaling. It is determined based on information such as CC to be notified. Therefore, when CA is applied, the user terminal performs ACK / NACK feedback with a codebook size fixedly determined based on the set number of CCs and the like.
- the codebook size cannot be changed in the user terminal.
- the ACK / NACK size to be transmitted may become larger than necessary even when the number of CCs that are actually scheduled is small.
- the codebook size of the HARQ-ACK may be fed back based on the DL signal (the number of CCs that received the DL signal) received by the user terminal.
- the code base size may be recognized differently between the radio base station and the user terminal. In such a case, the radio base station cannot appropriately receive (for example, decoding processing) ACK / NACK fed back from the user terminal, and communication quality may be deteriorated.
- the present invention has been made in view of such a point, and even when a plurality of component carriers are set in a wireless communication system, it is possible to appropriately perform HARQ-ACK feedback and suppress deterioration in communication quality.
- An object is to provide a user terminal, a radio base station, and a radio communication method.
- a user terminal includes: a receiving unit that receives DL signals transmitted from a plurality of cells to which TDD is applied; and a DL that is transmitted from a plurality of cells based on a bundling window defined by TDD.
- a control unit that controls to transmit a HARQ-ACK for the signal in a predetermined UL subframe, and the control unit transmits a HARQ-ACK codebook identifier (for each subframe of the bundling window)
- a cell for transmitting the HARQ-ACK is determined based on HCI: HARQ-ACK Codebook Indicator).
- the present invention it is possible to appropriately perform HARQ-ACK feedback and suppress deterioration in communication quality even when a plurality of component carriers are set in a wireless communication system.
- FIGS. 2A and 2B are diagrams for explaining a bundling window defined by TDD.
- 3A is a diagram for explaining DL DAI
- FIG. 3B is a diagram for explaining UL DAI.
- 4A is a diagram illustrating an example of CA
- FIG. 4B is a diagram illustrating an example of recognition of a scheduling CC between a user terminal and a radio base station.
- 5A and 5B are diagrams illustrating an example of a table defining HARQ-ACK codebook identifiers (HCI).
- 6A to 6C are diagrams illustrating an example of a HARQ-ACK transmission method using HCI in FDD, and FIG.
- FIG. 6D is a diagram illustrating an example of a table in which a HARQ-ACK codebook set is defined.
- 7A to 7E are diagrams illustrating another example of a HARQ-ACK transmission method using HCI in FDD
- FIG. 7F is a diagram illustrating another example of a table in which a HARQ-ACK codebook set is defined. It is.
- FIG. 8A and FIG. 8B are diagrams for explaining problems in using HCI with TDD.
- 9A and 9B are diagrams illustrating an example of a HARQ-ACK transmission method in the first mode. It is a figure explaining the determination method of the resource utilized for the HARQ-ACK transmission in a 1st aspect.
- 11A and 11B are diagrams illustrating another example of the HARQ-ACK transmission method in the first mode.
- 12A and 12B are diagrams illustrating an example of a HARQ-ACK transmission method in the second mode.
- 13A and 13B are diagrams illustrating another example of the HARQ-ACK transmission method in the second mode.
- 1 is a schematic configuration diagram of a wireless communication system according to an embodiment of the present invention. It is a figure which shows an example of the whole structure of the wireless base station which concerns on one Embodiment of this invention. It is a figure which shows an example of a function structure of the wireless base station which concerns on one Embodiment of this invention. It is a figure which shows an example of the whole structure of the user terminal which concerns on one Embodiment of this invention. It is a figure which shows an example of a function structure of the user terminal which concerns on one Embodiment of this invention.
- FIG. 1 is an explanatory diagram of carrier aggregation (CA).
- CA carrier aggregation
- LTE Rel LTE Rel.
- CC component carriers
- CC # 1-CC # 5 a basic unit
- the number of CCs that can be set per UE is limited to a maximum of five.
- LTE Rel. In 13 CAs it is considered that six or more CCs are bundled to further expand the bandwidth. That is, LTE Rel. In 13 CAs, it is considered to expand the number of CCs (cells) that can be set per UE to 6 or more (CA enhancement). For example, as shown in FIG. 1, when 32 CCs (CC # 1-CC # 32) are bundled, a maximum band of 640 MHz can be secured.
- CA for example, LAA
- LAA LAA
- uplink control information (UCI: Uplink Control Information) is transmitted from the UE to a device on the network side (for example, a radio base station (eNB: eNode B)). Feedback using PUCCH (Physical Uplink Control Channel).
- the UE may transmit UCI on an uplink shared channel (PUSCH: Physical Uplink Shared Channel) at a timing when uplink data transmission is scheduled. Based on the received UCI, the radio base station performs data retransmission control and scheduling control on the UE.
- PUSCH Physical Uplink Shared Channel
- retransmission control is supported in radio communication between a user terminal and a radio base station using a plurality of CCs (cells, carriers).
- the user terminal sends an acknowledgment signal (HARQ-ACK: Hybrid Automatic Repeat Request Acknowledgment, ACK / NACK: ACKnowledgement / Negative ACKnowledgement, A / N) to the radio base station in response to the DL transmission transmitted from the radio base station.
- HARQ-ACK Hybrid Automatic Repeat Request Acknowledgment
- ACK / NACK ACKnowledgement / Negative ACKnowledgement, A / N
- ACK / NACK is composed of a bit string of a predetermined length composed of bits indicating ACK and NACK.
- a plurality of PUCCH formats are defined for the user terminal to transmit A / N to the radio base station using the uplink control channel.
- a user terminal in which PUCCH format 1a / 1b is set is a PUCCH resource corresponding to a CCE / ECCE (Control Channel Element / Enhanced CCE) index of a control channel (PDCCH / EPDCCH) for scheduling PDSCH, and A / N Send without encoding.
- CCE / ECCE Control Channel Element / Enhanced CCE index of a control channel (PDCCH / EPDCCH) for scheduling PDSCH, and A / N Send without encoding.
- a user terminal in which PUCCH format 3 is set uses an A / N using any one PUCCH resource specified by ARI (Ack / nack Resource Indicator) among the four resources set in higher layer signaling. Send.
- the user terminal can read a TPC (Transmit Power Control) field (TPC command bit) included in the downlink control information of the SCell as an ARI.
- TPC Transmit Power Control
- the radio base station can set the same ARI value between the PDCCH and the EPDCCH that schedule PDSCHs of different SCells, and transmit the same to the user terminal.
- PUCCH format 3 an A / N codebook size of up to 10 bits is set when using FDD (Frequency Division Duplex), and up to 21 bits when using TDD (Time Division Duplex). Used for.
- the codebook (ACK / NACK bit string) size of HARQ-ACK transmitted by PUCCH is determined semi-static (semi-static) based on information notified by higher layer signaling.
- the entire A / N bit is based on the number of CCs configured by RRC signaling and TM (Transmission Mode) indicating whether MIMO (Multiple Input Multiple Output) is applicable in each CC.
- the size is fixed.
- the size of the entire A / N bit string transmitted by PUCCH is determined based on the number of DL subframes subject to A / N per UL subframe.
- The detects at least one DL assignment in a bundling window, the A in all CCs set using the PUCCH of the UL subframe after a predetermined period (for example, (n + k) ms) / N is fed back.
- a bundling window refers to a group of DL subframes (including special subframes) that perform A / N feedback in a certain UL subframe.
- Each bundling window is defined by the UL / DL configuration of TDD (see FIG. 2A).
- the user terminal that performs communication using TDD controls to transmit the A / N of the DL signal transmitted in a predetermined subframe in a predetermined UL subframe.
- a bundling window (DL subframe) corresponding to UL subframe # 2 is configured by DL subframes # 4, # 5, # 8, and special subframe # 6. (See FIG. 2B). Further, the bundling window for the UL subframe # 7 includes DL subframes # 9, # 0, # 3, and a special subframe # 1.
- the user terminal when the user terminal detects at least one DL assignment (DL assignment) in SF # 4 to # 5 and # 8, in the UL subframe # 2, the A / Ns of all CCs configured are set to PUCCH. provide feedback. That is, the user terminal transmits the A / N bit string based on higher layer signaling regardless of the number of CCs to be scheduled and the number of subframes included in the scheduling information.
- DL assignment DL assignment
- the A / N bit size to be fed back is determined based on the information notified by higher layer signaling, the A / N bit size is different from the A / N bit size corresponding to the number of CCs actually scheduled for the user terminal. Occurs. Therefore, when the A / N feedback of the existing system is applied, the A / N codebook size corresponding to the CC actually scheduled (DL signal is transmitted) and the codebook size notified by higher layer signaling are different. However, the user terminal cannot change the codebook size.
- a user terminal when a user terminal receives a UL grant instructing PUSCH transmission in subframe n, the user terminal feeds back A / N in a UL subframe after a predetermined period (for example, (n + k) ms).
- a predetermined period for example, (n + k) ms.
- UL DAI Downlink Assignment Indicator (Index)
- DL DAI Downlink Assignment Indicator (Index)
- DL DAI indicating a cumulative value of subframes to which DL assignment is transmitted is also defined.
- the DL DAI is included in the DL allocation and notified to the user terminal, and a different DL DAI is set for each subframe (subframe with DL allocation) included in the bundling window (see FIG. 3A).
- FIG. 3A shows a case where different DL DAIs are set in SF # n, # n3, and # 4 in which DL allocation is transmitted among the subframes of the bundling window.
- DL DAI can set the same value between different CCs in the same subframe.
- the SFs # n1 to # n4 of the bundling window are determined by the UL / DL configuration or the like. For example, in the bundling window corresponding to the UL subframe # 2 of the UL / DL configuration 2, SFs # n1 to # n4 are , Corresponding to SF # 4- # 6 and # 8, respectively.
- FIG. 3B shows a case where UL DAI is set in the UL grant transmitted in a predetermined subframe (for example, SFn4).
- a predetermined subframe for example, SFn4
- the user terminal when performing A / N transmission on PUCCH, the user terminal feeds back all CCs in the bundling window and A / Ns in all subframes regardless of the DL DAI value (spatial bundling is not applied Time). For example, in FIG. 3A, the user terminal transmits ACK / NACK corresponding to all the set CC # 0 to # 4 and all SF # n1 to # n4 in the bundling window.
- the user terminal grasps subframes with DL allocation based on the values of UL DAI and DL DAI, and sets all subframes with DL allocation.
- a / N of CC is fed back (when spatial bundling is not applied). For example, in FIG. 3A, the user terminal transmits ACK / NACK corresponding to all the set CC # 0- # 4 and SF # n1, # n3, # n4.
- FIG. 4A shows a case where 32 CCs are set in the user terminal and the number of CCs that are actually scheduled is 10.
- the number of cells actually scheduled (10 CCs) is smaller than the total number of CCs (32 CCs), and more than half of the CCs are NACKs.
- SINR Signal to Interference plus Noise power Ratio
- the user terminal dynamically changes the number of A / N bits according to the number of scheduled CCs and the like. Can be considered.
- the user terminal determines the number of A / N bits based on the number of detected downlink signals (for example, PDCCH / EPDCCH for scheduling PDSCH). Conceivable.
- the radio base station performs scheduling (DL signal transmission) using 8CC for the user terminal, but the user terminal shows a case where PDCCH / EPDCCH (scheduling information) for 5 CC is detected. Yes.
- the user terminal has made a detection error with respect to a DL signal for 3 CC (for example, PDCCH / EPDCCH).
- the user terminal when determining the A / N codebook size based on the DL signal (number of CCs) detected by the user terminal in FIG. 4B, the user terminal transmits the detected A / N bit string for 5 CCs to the radio base station. For this reason, the radio base station cannot correctly decode, and the entire A / N bit string is affected, and the feedback quality using A / N is significantly deteriorated.
- the user terminal determines that the number of CCs is less than the number of CCs that the radio base station has transmitted the DL signal. Further, when a user terminal erroneously detects a DL signal transmitted from a radio base station, the user terminal determines that the number of CCs allocated is greater than the number of CCs to which the radio base station transmits the DL signal.
- the method of determining the codebook size of A / N transmitted by the user terminal based on the number of detected PDCCH / EPDCCH can be easily applied. However, if a detection error or a false detection occurs, the radio base station and the user terminal The codebook size is not recognized correctly. In such a case, as described above, feedback quality based on A / N may deteriorate, and communication quality may deteriorate.
- the radio base station includes an identifier indicating the CC (or the number of CCs) for feeding back A / N in the downlink control information and notifies the user terminal.
- An identifier indicating a CC that feeds back A / N can also be called a HARQ-ACK codebook identifier (HCI: HARQ-ACK codebook indicator).
- the radio base station configures (configure / pre-define) a HARQ-ACK codebook set in advance in the user terminal by upper layer signaling (eg, RRC signaling). For example, the radio base station sets a combination of CCs to which the user terminal should feed back A / N as each HARQ-ACK codebook set (see FIGS. 5A and 5B).
- 5A and 5B show an example of the HARQ-ACK codebook set when CC # 0- # 31 is set in the user terminal.
- the radio base station specifies to the user terminal which codebook to use from the codebook set, including the HCI in the downlink control information.
- the user terminal generates and feeds back an A / N bit string of the CC designated by the HCI.
- the HARQ-ACK codebook set in FIG. 5A can be suitably applied to the case where the user terminal performs A / N feedback on the CC specified by the HCI regardless of whether or not DL allocation is detected (method 1). . Also, the HARQ-ACK codebook set in FIG. 5B is preferably applied to the case where A / N feedback is performed for the CC specified by the HCI in consideration of the CC in which the user terminal detects the DL assignment (method 2). can do.
- FIG. 6D An example of an A / N feedback method when the user terminal applies method 1 is shown in FIG.
- CC # 0 to # 7 are set in the user terminal, and the user terminal determines a cell to perform A / N transmission based on a table (FIG. 6D) in which the HARQ-ACK codebook set is defined. Show.
- FIG. 7F An example of an A / N feedback method when the user terminal applies method 2 is shown in FIG.
- CC # 0 to # 7 are set in the user terminal, and the user terminal determines a cell to perform A / N transmission based on a table (FIG. 7F) in which the HARQ-ACK codebook set is defined. Show.
- the scheduling CC can change for each subframe within one bundling window.
- the HCI value is set for each subframe in the bundling window and the user terminal performs A / N transmission based on the HCI transmitted in each subframe.
- FIG. 8A shows an example of DL allocation (DL DAI, HCI) in a subframe of a bundling window for user terminals for which CC # 0 to # 7 are set.
- FIG. 8B shows an example of a table in which the correspondence relationship between the HARQ-ACK codebook set (CC performing A / N transmission) and the HCI is defined.
- FIG. 8A shows a case where DL signals are scheduled to CC # 0 to # 7 in SF # n1, CC # 0 to CC # 3 in SF # n3, CC # 0 and # 1 in SF # n4 in the bundling window. Show.
- the user terminal determines a CC that performs A / N transmission in each subframe based on the HCI.
- the present inventors consider the HCI transmitted for each subframe included in the bundling window, and perform the CC for performing HARQ-ACK transmission in the bundling window (CC to be subjected to A / N feedback).
- CC to be subjected to A / N feedback.
- the idea was to determine the CC (A / N bit number) for A / N transmission in consideration of all HCI transmitted in the bundling window.
- CC (A / N bit number) that performs A / N transmission to all SFs in the bundling window based on the maximum HCI among the HCIs transmitted for each SF included in the bundling window Found that to decide.
- a / N is transmitted on the PUCCH of a predetermined cell (for example, PCell, PUCCH SCell) using the method 1.
- CC (A / N bit number) may be determined.
- the number of A / N bits is determined as a CC for which A / N transmission is performed with respect to all SFs in the bundling window, with CCs designated even once by the HCI transmitted for each SF included in the bundling window. I found out.
- Such a configuration can be suitably applied when A / N is transmitted on the PUCCH of a predetermined cell (for example, PCell, PUCCH SCell) using the method 2.
- the CC for performing A / N transmission is determined for the bundling window, and UL DAI and / or DL DAI is determined. It was found that the SF (or the number of SFs) for A / N transmission is determined based on the above. Such a configuration can be suitably applied when A / N is transmitted on the PUSCH using the method 1 described above.
- the CC that has been instructed even once based on the HCI transmitted for each SF included in the bundling window and the detection result of the user terminal is determined as a CC that performs A / N transmission on the bundling window, It has been found that the SF (or the number of SFs) for performing A / N transmission is determined based on UL DAI and / or DL DAI. Such a configuration can be suitably applied when A / N is transmitted on the PUSCH using the method 2.
- a case where four SFs are set as a bundling window (for example, a bundling window corresponding to UL subframe 2 of UL / DL configuration 2) will be described as an example, but the present embodiment is not limited to this. Absent.
- the number of SFs included in the bundling window is not limited to four and can be changed according to the UL / DL configuration.
- PUCCH format 3 is used as A / N feedback, but the present invention is not limited to this. It is also possible to use a new PUCCH format having a larger capacity than PUCCH format 3. Further, the number and arrangement of the cells to be scheduled, the index of the cell to be scheduled, and the transmitted signal are not limited to the following examples.
- Method 1 for determining an A / N codebook by HCI regardless of whether or not DL assignment is detected, and HCI and DL assignment
- the method 2 for determining the A / N codebook based on the detected CC will be described as an example, but is not limited thereto. Further, when method 1 is applied, the table of FIG. 6D is used, and when method 2 is applied, the table of FIG. 7F is used. However, applicable tables are not limited to this.
- the user terminal feeds back the A / N for the CC indicated by the maximum HCI among the HCIs transmitted by the SF included in the bundling window for all the SFs.
- the maximum HCI indicates the HCI with the maximum number of CCs instructing A / N transmission. In the case of the table of FIG. 6D, the HCI value “0” is the maximum HCI.
- the radio base station can notify the user terminal by including the HCI in downlink control information (for example, DL allocation including DL DAI or the like). Therefore, the HCI is transmitted in the SF of the bundling window can be an SF in which DL assignment is transmitted (for example, DL data is scheduled). Also, when there are multiple CCs that transmit DL assignments in a certain subframe, the radio base station sets DL DAI, UL DAI, and HCI to a common value among the multiple CCs, and transmits the same to the user terminal. be able to.
- FIG. 9 shows an example of determining a CC for A / N transmission based on the maximum HCI among the HCIs transmitted for each bundling window SF (SF for which DL allocation is transmitted).
- FIG. 9A shows a case where DL allocation is transmitted with a predetermined CC in SF # n1, # n3, # n4 among SF # n1- # n4 included in the bundling window. Specifically, DL assignment is transmitted in CC # 0- # 7 in SF # n1, CC # 0- # 3 in SF # n3, and CC # 0- # 1 in SF # n4.
- FIG. 9B shows a case where DL allocation is transmitted with a predetermined CC in SF # n1, # n3, and # n4 among SF # n1- # n4 included in the bundling window. Specifically, DL assignment is transmitted in CC # 0- # 3 in SF # n1, CC # 0- # 3 in SF # n3, and CC # 0- # 1 in SF # n4.
- the number of CCs to perform is determined as CC # 0-CC # 3.
- the user terminal generates A / N so as to feed back the A / N bits in all SF # n1- # n4 to the determined CC # 0- # 3.
- ⁇ ACK / NACK resources When a user terminal feeds back A / N using PUCCH, it can be considered to use a resource indicated by downlink control information. For example, when the user terminal performs transmission using PUCCH of a predetermined cell using PUCCH format 3 (or a new PUCCH format), the PUCCH resource is determined based on the ARI value included in the downlink control information.
- the radio base station increases the number of CCs that transmit DL assignments from the middle of the SF included in the bundling window (see FIG. 10).
- CC # 0- # 1 in SF # n1 included in the bundling window CC # 0 in SF # n2, CC # 0- # 7 in SF # n3, CC # 0- # 1 in SF # n4
- Each DL assignment is transmitted.
- the PUCCH resource is determined based on the ARI value included in the downlink control information transmitted in the SF (SF # n3 in FIG. 10) indicating the maximum value of the HCI. can do.
- the PUCCH resource can be determined based on the ARI value designated by one of the SFs (for example, the second half SF).
- PUCCH resource set in consideration of the maximum HCI (number of CCs) used for determining the number of A / N bits.
- ACK / NACK transmission PUCCH format selection, PUCCH resource determination, etc.
- the present embodiment is not limited to this, and an ARI transmitted by an SF after the SF in which the HCI indicates the maximum value may be used.
- the base station In the SF in which the HCI indicates the maximum value, the base station is considered to have determined the PUCCH format to be transmitted to the user terminal. For this reason, when the PUCCH resource is determined using the ARI transmitted in the subsequent SF, the same effect as in the case where the PUCCH resource is determined using the ARI of the SF indicating the maximum value of the HCI can be obtained. it can.
- the user terminal controls A / N feedback for CCs that are designated even once by the HCI transmitted by each SF # n1, # n3, and # n4.
- CC # 0-CC # 7 is instructed at least once based on the detection result of the HCI received at SF # n1, # n3, # n4 of the bundling window and the DL assignment of the user terminal Can do. Therefore, the user terminal generates and feeds back A / N bits in all SF # n1- # n4 for CC # 0-CC # 7 (when spatial bundling is not applied).
- FIG. 11B shows that among SF # n1- # n4 included in the bundling window, CC # 0- # 3 in SF # n1, CC # 0- # 3 in SF # n3, CC # 4- # 5 in SFn4 The case where DL assignment is transmitted is shown.
- the A / N between the user terminal and the radio base station is determined.
- the codebook size recognition can be matched appropriately.
- FIG. 12 shows an example of determining a CC for A / N transmission based on the maximum HCI among the HCIs transmitted for each SF (each SF for which DL assignment is transmitted) included in the bundling window. Is shown.
- DL assignments are transmitted in CC # 0- # 7 in SF # n1, CC # 0- # 3 in SF # n3, and CC # 0- # 1 in SF # 4 included in the bundling window. Shows the case.
- the number of CCs to perform is determined as CC # 0 to CC # 7.
- the user terminal can grasp the number of SFs to which DL data is transmitted based on UL DAI.
- the user terminal can identify which SF is not assigned (or a detection error has occurred) based on DL DAI.
- FIG. 12B shows that DL assignment is transmitted in CC # 0- # 3 in subframe SF # n1, CC # 0- # 3 in SF # n3, and CC # 0- # 1 in SF # n4 included in the bundling window. Shows the case.
- the user terminal In the case shown in FIG. 12B, the user terminal generates and feeds back A / N bits in SFSF # n1, # n3, and # n4 to CC # 0 to # 3.
- the number of A / N bits based on HCI and UL DAI and / or DL DAI, an increase in PUSCH overhead can be suppressed.
- the radio base station can use UL DAI and DL DAI in the same manner as the existing system, and can specify the CC to be subjected to A / N transmission in each SF using HCI.
- the user terminal determines the CC to be subject to A / N feedback for the CC designated even once based on the detection of the HCI and DL assignment transmitted in each SF # n1, # n3, # n4.
- UL DAI UL DAI
- the radio base station can use the UL DAI and DL DAI in the same way as the existing system, and can specify the CC to be subject to A / N feedback in each SF using the HCI.
- the user terminal transmits A / N via PUSCH by determining CC and SF that perform A / N transmission using UL DAI, DL DAI, and HCI and generating A / N bits.
- a / N payload (overhead) can be reduced.
- the user terminal determines the CC and SF that perform A / N transmission using UL DAI, DL DAI, and HCI, and generates the A / N bit, thereby A / N between the user terminal and the radio base station. Codebook size recognition can be matched.
- wireless communication system Wireless communication system
- the radio communication method according to each of the above aspects is applied.
- wireless communication method which concerns on each said aspect may be applied independently, respectively, and may be applied in combination.
- FIG. 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- carrier aggregation (CA) and / 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 are 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), or the like.
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 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 radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes 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), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- Downlink 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), etc. Including. Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH. The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The HAICH transmission confirmation information (ACK / NACK) for PUSCH is transmitted by PHICH.
- EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
- an uplink shared channel shared by each user terminal 20
- an uplink control channel PUCCH: Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- User data and higher layer control information are transmitted by the PUSCH.
- Uplink control information including at least one of delivery confirmation information (ACK / NACK) and radio quality information (CQI) is transmitted by PUSCH or PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing
- HARQ Hybrid Automatic Repeat reQuest
- 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 baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on user data included in the input upstream signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- FIG. 16 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 16 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 16, the baseband signal processing unit 104 includes a control unit (scheduler) 301, a transmission signal generation unit (generation unit) 302, a mapping unit 303, and a reception signal processing unit 304. .
- the baseband signal processing unit 104 includes a control unit (scheduler) 301, a transmission signal generation unit (generation unit) 302, a mapping unit 303, and a reception signal processing unit 304.
- the control unit (scheduler) 301 controls scheduling (for example, resource allocation) of downlink data signals transmitted on PDSCH and downlink control signals transmitted on PDCCH and / or EPDCCH. It also controls scheduling of system information, synchronization signals, paging information, CRS (Cell-specific Reference Signal), CSI-RS (Channel State Information Reference Signal), and the like. Further, scheduling of uplink reference signals, uplink data signals transmitted on PUSCH, uplink control signals transmitted on PUCCH and / or PUSCH, and the like is controlled.
- the control unit 301 controls retransmission / downlink data transmission of downlink data based on a delivery confirmation signal (HARQ-ACK) fed back from the user terminal. Also, the control unit 301 controls HARQ-ACK reception processing in which a user terminal feeds back DL transmission based on a bundling window. Note that the reception processing may be performed by the reception signal processing unit 304 based on an instruction from the control unit 301.
- HARQ-ACK delivery confirmation signal
- the transmission signal generation unit 302 generates a DL signal (including a downlink data signal and a downlink control signal) based on an instruction from the control unit 301 and outputs the DL signal to the mapping unit 303.
- transmission signal generation section 302 generates a downlink data signal (PDSCH) including user data and outputs it to mapping section 303.
- the transmission signal generation unit 302 generates a downlink control signal (PDCCH / EPDCCH) including DCI (UL grant) and outputs the downlink control signal (PDCCH / EPDCCH) to the mapping unit 303.
- the transmission signal generation unit 302 generates downlink reference signals such as CRS and CSI-RS, and outputs them to the mapping unit 303.
- the transmission signal generation unit 302 can be 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.
- FIG. 17 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the transmission / reception unit 203 may include a transmission unit and a reception unit.
- the transmission / reception unit (reception unit) 203 receives DL signals transmitted from a plurality of cells to which TDD is applied. For example, the transmission / reception unit (reception unit) 203 receives the HARQ-ACK codebook identifier (HCI) transmitted for each subframe of the bundling window. In addition, the transmission / reception unit (transmission unit) 203 transmits HARQ-ACK for the received DL signal.
- the transmission / reception unit 203 can be 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.
- FIG. 18 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 18 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 18, the baseband signal processing unit 204 included in 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 determination unit 405. I have.
- the control unit 401 obtains, from the received signal processing unit 404, a downlink control signal (a signal transmitted by PDCCH / EPDCCH) and a downlink data signal (a signal transmitted by PDSCH) transmitted from the radio base station 10.
- the control unit 401 generates an uplink control signal (for example, an acknowledgment signal (HARQ-ACK)) or an uplink data signal based on a downlink control signal, a result of determining whether retransmission control is necessary for the downlink data signal, or the like.
- HARQ-ACK acknowledgment signal
- the control unit 401 can control the transmission signal generation unit 402, the mapping unit 403, and the reception signal processing unit 404.
- the control unit 401 determines a cell to transmit HARQ-ACK for the bundling window based on the HARQ-ACK codebook identifier (HCI) transmitted for each subframe of the bundling window. For example, the control unit 401 can determine a cell (HARQ-ACK bit number) to transmit HARQ-ACK based on the maximum HCI among the HCIs transmitted for each subframe of the bundling window. . Further, the control unit 401 can determine a resource for transmitting HARQ-ACK based on an ARI (Ack / nack Resource Indicator) transmitted in a subframe in which the maximum HCI is transmitted.
- ARI Ack / nack Resource Indicator
- control unit 401 performs A / N transmission to all SFs in the bundling window based on the HCI of the SF scheduled last in the HCI transmitted for each SF included in the bundling window.
- the CC number of A / N bits to be used may be determined.
- the control unit 401 performs HARQ based on the DL DAI and HCI transmitted in each subframe and the UL DAI transmitted in the predetermined subframe.
- the number of ACK bits can be determined and controlled to be transmitted on the uplink shared channel.
- the control unit 401 determines a cell to transmit HARQ-ACK based on the maximum HCI among the HCIs transmitted for each subframe of the bundling window, and based on the UL DAI and / or DL DAI.
- a subframe in which HARQ-ACK is transmitted can be determined.
- the transmission signal generation unit 402 generates a UL signal based on an instruction from the control unit 401 and outputs the UL signal to the mapping unit 403. For example, the transmission signal generation unit 402 generates an uplink control signal such as a delivery confirmation signal (HARQ-ACK) or channel state information (CSI) based on an instruction from the control unit 401.
- HARQ-ACK delivery confirmation signal
- CSI channel state information
- the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.
- the transmission signal generation unit 402 may be 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.
- the mapping unit 403 maps the uplink signal (uplink control signal and / or uplink data) generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio resource to the transmission / reception unit 203.
- the mapping unit 403 may be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the DL signal (for example, downlink control signal transmitted from the radio base station, downlink data signal transmitted by PDSCH, etc.). I do.
- the reception signal processing unit 404 outputs information received from the radio base station 10 to the control unit 401 and the determination unit 405.
- the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
- the determination unit 405 performs retransmission control determination (ACK / NACK) based on the decoding result of the received signal processing unit 404 and outputs the determination result to the control unit 401.
- ACK / NACK retransmission control determination
- ACK / NACK retransmission control determination
- the determination part 405 can be comprised from the determination circuit or determination apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- each functional block is realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- Computer-readable recording media include, for example, flexible disks, magneto-optical disks, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), CD-ROM (Compact Disc-ROM), RAM (Random Access Memory), A storage medium such as a hard disk.
- the program may be transmitted from a network via a telecommunication line.
- the radio base station 10 and the user terminal 20 may include an input device such as an input key and an output device such as a display.
- the functional configurations of the radio base station 10 and the user terminal 20 may be realized by the hardware described above, may be realized by a software module executed by a processor, or may be realized by a combination of both.
- the processor controls the entire user terminal by operating an operating system. Further, the processor reads programs, software modules and data from the storage medium into the memory, and executes various processes according to these.
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- the component carrier (CC) may be called a carrier frequency, a cell, or the like.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.
- notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods.
- notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 5G
- FRA Full Radio Access
- CDMA2000 Code Division Multiple Access 2000
- UMB User Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX
- IEEE 802.20 UWB (Ultra-WideBand)
- Bluetooth registered trademark
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Abstract
Description
第1の態様では、バンドリングウィンドウに含まれるサブフレーム毎に送信されるHCIを考慮して、A/Nコードブックを決定して所定セルのPUCCHでフィードバックする場合について説明する。以下の説明では、HCIによりA/Nコードブックを決定する方法1と、HCIとDL割当ての検出CCによりA/Nコードブックを決定する方法2を例に挙げて説明する。
ユーザ端末は、バンドリングウィンドウに含まれるSFで送信されるHCIのうち最大のHCIで指示されるCCに対するA/Nを、全てのSF分フィードバックする。最大のHCIとは、A/N送信を指示するCC数が最大のHCIを指し、図6Dのテーブルの場合はHCIの値が“0”が最大のHCIとなる。
ユーザ端末は、PUCCHを利用してA/Nをフィードバックする場合、下り制御情報で指示されるリソースを利用することが考えられる。例えば、ユーザ端末が、PUCCHフォーマット3(又は新規PUCCHフォーマット)を利用して所定セルのPUCCHで送信を行う場合、下り制御情報に含まれるARIの値に基づいてPUCCHリソースを決定する。
ユーザ端末は、バンドリングウィンドウに含まれるSFで送信されるHCIで一度でも指示されたCCについて、全てのSF分のA/NをPUCCHでフィードバックするように制御することができる。
バンドリングウィンドウに対するA/Nビットの送信を行うタイミング(ULサブフレーム)においてULグラントでスケジューリングされたPUSCH送信がある場合、当該A/NビットはPUSCHに多重(Piggyback)して送信される。なお、PUCCH-PUSCH同時送信(Simultaneous PUCCH-PUSCH送信)が設定されている場合は、PUSCHに多重せずPUCCHを用いて行うことができる。
ユーザ端末は、バンドリングウィンドウの所定SFで送信されるDAI(UL DAI及び/又はDL DAI)とHCIに基づいてA/N送信を行うCCとSF(A/Nビット数)を決定する。
ユーザ端末は、バンドリングウィンドウに含まれるSFで送信されるDAI(UL DAI及び/又はDL DAI)と、HCIと、DL割当てでスケジューリングされたCCの検出に基づいてHARQ-ACKビット数を決定することができる。
以下、本発明の一実施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、上記各態様に係る無線通信方法が適用される。なお、上記各態様に係る無線通信方法は、それぞれ単独で適用されてもよいし、組み合わせて適用されてもよい。
図15は、本発明の一実施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。なお、送受信部103は、送信部及び受信部で構成される。
図17は、本発明の一実施形態に係る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、MIMO伝送のための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。なお、送受信部203は、送信部及び受信部から構成されてもよい。
Claims (10)
- TDDを適用する複数のセルから送信されるDL信号を受信する受信部と、
TDDで規定されるバンドリングウィンドウに基づいて複数のセルから送信されるDL信号に対するHARQ-ACKを所定のULサブフレームで送信するように制御する制御部と、を有し、
前記制御部は、前記バンドリングウィンドウのサブフレーム毎に送信されるHARQ-ACKコードブック識別子(HCI:HARQ-ACK Codebook Indicator)に基づいて、前記HARQ-ACKの送信を行うセルを決定することを特徴とするユーザ端末。 - 前記制御部は、前記バンドリングウィンドウのサブフレーム毎に送信されるHCIの中で最大のHCIに基づいて、前記HARQ-ACKの送信を行うセルを決定す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、前記最大のHCIが送信されるサブフレームで送信されるARI(Ack/nack Resource Indicator)に基づいてHARQ-ACKを送信するリソースを決定することを特徴とする請求項2に記載のユーザ端末。
- 前記制御部は、前記バンドリングウィンドウのサブフレーム毎に送信されるHCIで少なくとも一度指示されたセルに対して前記HARQ-ACKを送信するように制御す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、前記バンドリングウィンドウの全てのサブフレームのHARQ-ACKを上り制御チャネルで送信することを特徴とする請求項1から請求項4のいずれかに記載のユーザ端末。
- 前記バンドリングウィンドウの所定サブフレームでULグラントが送信される場合、前記制御部は、サブフレーム毎に送信されるDL DAI(Downlink Assignment Indicator(Index))、前記HCI、及び前記所定サブフレームで送信されるUL DAIに基づいて、HARQ-ACKビット数を決定して、上り共有チャネルで送信するように制御す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、前記バンドリングウィンドウのサブフレーム毎に送信されるHCIの中で最大のHCIに基づいて前記HARQ-ACKの送信を行うセルを決定すると共に、前記UL DAI及び/又は前記DL DAIに基づいて前記HARQ-ACKの送信を行うサブフレームを決定することを特徴とする請求項6に記載のユーザ端末。
- 前記制御部は、前記バンドリングウィンドウのサブフレーム毎に送信されるHCIで少なくとも一度指示されたセルに対して前記HARQ-ACKを送信するように制御することを特徴とする請求項6に記載のユーザ端末。
- 複数のセルを利用可能なユーザ端末と通信を行う無線基地局であって、
TDDを適用して各セルからDL送信を行う送信部と、
前記DL送信に対して前記ユーザ端末がTDDで規定されるバンドリングウィンドウに基づいてフィードバックするHARQ-ACKの受信を制御する制御部と、を有し、
前記送信部は、前記バンドリングウィンドウのDL割当てを行うサブフレーム毎にHARQ-ACKコードブック識別子(HCI:HARQ-ACK Codebook Indicator)を送信し、前記制御部は、前記HCIに基づいて前記ユーザ端末からフィードバックされるHARQ-ACKビット数を判断することを特徴とする無線基地局。 - 複数のセルを利用して通信可能なユーザ端末の無線通信方法であって、
TDDを適用する複数のセルから送信されるDL信号を受信する工程と、
TDDで規定されるバンドリングウィンドウに基づいて複数のセルから送信されるDL信号に対するHARQ-ACKを所定のULサブフレームで送信する工程と、を有し、
前記バンドリングウィンドウのサブフレーム毎に送信されるHARQ-ACKコードブック識別子(HCI:HARQ-ACK Codebook Indicator)に基づいて、前記HARQ-ACKの送信を行うセルを決定することを特徴とする無線通信方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US15/761,582 US20180343097A1 (en) | 2015-09-24 | 2016-09-08 | User terminal, radio base station and radio communication method |
JP2017541509A JP6894841B2 (ja) | 2015-09-24 | 2016-09-08 | 端末、無線基地局及び無線通信方法 |
EP16848505.0A EP3355612B1 (en) | 2015-09-24 | 2016-09-08 | User terminal, wireless base station, and wireless communication method |
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EP (1) | EP3355612B1 (ja) |
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WO2021192063A1 (ja) * | 2020-03-24 | 2021-09-30 | 株式会社Nttドコモ | 端末 |
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CN106165514B (zh) * | 2015-02-09 | 2020-07-03 | 诸暨市元畅信息技术咨询服务部 | 一种rlc数据包重传方法及基站 |
EP3593560B1 (en) * | 2017-03-08 | 2023-08-16 | Nokia Solutions and Networks Oy | Apparatus and method for communication |
US11411686B2 (en) * | 2017-03-24 | 2022-08-09 | Lg Electronics Inc. | Method for performing HARQ process in wireless communication system and apparatus therefor |
US20200092068A1 (en) * | 2018-09-19 | 2020-03-19 | Qualcomm Incorporated | Acknowledgement codebook design for multiple transmission reception points |
CN112217620B (zh) * | 2019-07-12 | 2022-04-01 | 大唐移动通信设备有限公司 | 混合自动重传请求确认码本的确定方法、终端及网络设备 |
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KR20150060118A (ko) * | 2013-11-25 | 2015-06-03 | 주식회사 아이티엘 | Harq ack/nack의 전송방법 및 장치 |
EP3251245B1 (en) * | 2015-01-28 | 2023-04-05 | InterDigital Patent Holdings, Inc. | Uplink feedback methods for operating with a large number of carriers |
US10313067B2 (en) * | 2015-01-29 | 2019-06-04 | Samsung Electronics Co., Ltd. | HARQ-ACK information feedback method and apparatus |
US10587372B2 (en) * | 2015-04-20 | 2020-03-10 | Lg Electronics Inc. | Method for multiplexing ACK/NACK response in wireless communication system, and apparatus therefor |
US10182467B2 (en) * | 2015-08-06 | 2019-01-15 | Innovative Technology Lab Co., Ltd. | Apparatus and method for transmitting uplink control information through a physical uplink control channel |
WO2017024539A1 (zh) * | 2015-08-10 | 2017-02-16 | 华为技术有限公司 | 上行控制信息传输方法和装置 |
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- 2016-09-08 JP JP2017541509A patent/JP6894841B2/ja active Active
- 2016-09-08 EP EP16848505.0A patent/EP3355612B1/en active Active
- 2016-09-08 WO PCT/JP2016/076486 patent/WO2017051717A1/ja active Application Filing
Non-Patent Citations (3)
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INTERDIGITAL COMMUNICATIONS: "HARQ-ACK codebook determination", 3GPP TSG-RAN WG1 MEETING #82 R1-154309, 14 August 2015 (2015-08-14), XP051039450 * |
NTT DOCOMO, INC.: "Dynamic HARQ-ACK feedback adaptation for CA enhancements", 3GPP TSG RAN WG1 MEETING #82BIS RL-155691, 26 September 2015 (2015-09-26), XP051021697 * |
ZTE: "HARQ-ACK compression for eCA", 3GPP TSG RAN WG1 MEETING #82 R1-154034, 15 August 2015 (2015-08-15), XP050994324 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2021192063A1 (ja) * | 2020-03-24 | 2021-09-30 | 株式会社Nttドコモ | 端末 |
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EP3355612A4 (en) | 2019-05-15 |
EP3355612A1 (en) | 2018-08-01 |
JP6894841B2 (ja) | 2021-06-30 |
EP3355612B1 (en) | 2021-08-04 |
US20180343097A1 (en) | 2018-11-29 |
JPWO2017051717A1 (ja) | 2018-07-12 |
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