WO2020031278A1 - Dispositif de transmission, dispositif de réception, système de communication sans fil et procédé de communication - Google Patents

Dispositif de transmission, dispositif de réception, système de communication sans fil et procédé de communication Download PDF

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Publication number
WO2020031278A1
WO2020031278A1 PCT/JP2018/029690 JP2018029690W WO2020031278A1 WO 2020031278 A1 WO2020031278 A1 WO 2020031278A1 JP 2018029690 W JP2018029690 W JP 2018029690W WO 2020031278 A1 WO2020031278 A1 WO 2020031278A1
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data
group
transmitting
transmission
shared channel
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PCT/JP2018/029690
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English (en)
Japanese (ja)
Inventor
下村剛史
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富士通株式会社
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Priority to PCT/JP2018/029690 priority Critical patent/WO2020031278A1/fr
Publication of WO2020031278A1 publication Critical patent/WO2020031278A1/fr

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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
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a transmitting device, a receiving device, a wireless communication system, and a communication method.
  • Non-Patent Documents 12 to 39 are being conducted by working groups of the 3GPP (Third Generation Partnership Project) (for example, TSG-RAN WG1, TSG-RAN WG2, etc.) (Non-Patent Documents 12 to 39). .
  • 5G is classified into eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communication) in order to support various services. It is intended to support many use cases.
  • eMBB Enhanced Mobile Broadband
  • Massive MTC Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communication
  • LTE-LAA Long Term Evolution-Licensed Assisted Access
  • LTE-LAA Long Term Evolution-Licensed Assisted Access
  • LTE-LAA is, for example, a technology in which a frequency band of Unlicensed @ spectrum and a frequency band of Licensed @ spectrum (or Licensed @ band) are bundled and used simultaneously.
  • LTE-LAA for example, it is possible to realize high speed and large capacity.
  • LBT Listen-Before-Talk
  • the transmitting side performs carrier @ sensing (or carrier sense) before starting signal transmission, and confirms that the wireless channel is in the "Idle" state (no other communication is being performed). Start data transmission.
  • carrier @ sensing or carrier sense
  • start data transmission for example, fair coexistence between different networks such as Wi-Fi and LTE can be realized.
  • FIGS. 24A and 24B show an example thereof.
  • the base station determines (or schedules) radio resource allocation, an error correction coding rate, a modulation scheme, and the like, and transmits the scheduling result to the terminal.
  • the base station transmits DCI (Downlink Control Information) including the scheduling result to the terminal using PDCCH (Physical Downlink Control CHannel).
  • DCI Downlink Control Information
  • PDCCH Physical Downlink Control CHannel
  • the terminal uses PDSCH (Physical Downlink Shared CHannel) to extract data addressed to the own station from the received signal, or uses PUSCH (Physical Uplink Shared CHannel) to transmit data. Can be transmitted to the base station.
  • PDSCH Physical Downlink Shared CHannel
  • PUSCH Physical Uplink Shared CHannel
  • HARQ Hybrid Automatic Repeat request
  • the receiving apparatus requests the transmitting apparatus to retransmit data that could not be correctly decoded in processing of a layer 1 protocol layer such as LTE.
  • the transmitting device transmits retransmission data corresponding to the original data retransmission request that could not be correctly decoded on the receiving device side.
  • data decoding is performed by combining the data that could not be correctly decoded and the retransmission data. As a result, highly efficient and accurate retransmission control is realized.
  • $ 5G further defines a code block based HARQ-Feedback. For example, consider a case where four data are included in a transport block (TB) as Code @ Block (or CBG: Code @ Block @ Group). In this case, the receiving apparatus implements HARQ feedback for each Code @ Block using a plurality of bits.
  • TB transport block
  • CBG Code @ Block @ Group
  • FIG. 25A is a diagram illustrating an example of retransmission control in TB units
  • FIG. 25B is a diagram illustrating an example of retransmission control in CBG units.
  • the gNB transmits a control signal using the PDCCH (S100), and transmits TB # 0 using the PDSCH (S101).
  • the UE User @ Equipment
  • the gNB receives the NAK, transmits a control signal (S103), and retransmits TB # 0 (S104).
  • the gNB transmits a control signal including “1111” as CBG transmission information using the PDCCH (S110).
  • FIG. 25B illustrates an example in which four CBGs are included in TB # 0, and the CBG transmission information “1111” indicates that all CBGs included in the TB are transmitted.
  • the UE receives TB # 0 (S111), but failed to correctly decode CBG # 1 and CBG # 2 and correctly decode CBG # 0 and CBG # 3. Therefore, the UE feeds back "NAK @ ACK (Acknowledgement: AcKnowledgement) @ ACK @ NAK" to the gNB (S112).
  • the gNB transmits a control signal including “1001” (transmits CBG # 0 and CBG # 3, but does not transmit CBG # 1 and CBG # 2) as CBG transmission information (S113). Also, the gNB retransmits CBG # 0 and CBG # 3 using the PDSCH (S114).
  • the following technologies are related to the wireless communication system. That is, if the transmission of the DL (Down @ Link) signal and / or the UL (Up @ Link) signal is supported in the middle of the subframe according to the listening result, the first period after the control unit receives the UL transmission instruction. There is a user terminal that transmits a UL signal within a second period set after the elapse.
  • UL transmission can be appropriately performed in a cell (for example, an unlicensed band) to which listening is applied before transmission.
  • the disclosed technology has been made in view of the above, and aims to improve the throughput.
  • a transmitting device capable of wirelessly communicating with a receiving device using a first frequency band that does not require a license, wherein the first frequency band is detected in a signal detection process for the first frequency band. If no signal is detected in the band, the first symbol including the first control channel and the first shared channel or the second symbol including the second shared channel is shifted in the time direction.
  • the first or second data respectively allocated to the first or second shared channel is included in a control unit capable of puncturing in units of groups and a group not punctured with the first control signal
  • the first data to be transmitted using the first control channel and the first shared channel, respectively, or the second data included in a non-punctured group to the second data.
  • Using the channel and a transmission unit that transmits to the receiving device.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system.
  • 2 (A) to 2 (D) show an example of TB transmission
  • FIG. 2 (E) shows an example of the configuration of one slot.
  • FIGS. 3A to 3D are diagrams illustrating transmission examples of TB.
  • 4A to 4D are diagrams illustrating examples of puncturing.
  • FIGS. 5A to 5D are diagrams illustrating examples of puncturing.
  • 6A to 6D are diagrams illustrating examples of puncturing.
  • FIGS. 7A to 7D are diagrams illustrating an example of the feedback system 1.
  • FIG. FIG. 8 is a diagram illustrating an example of a field included in the PDCCH.
  • FIG. 9 is a diagram illustrating an example of the NDI.
  • FIGS. 10A to 10C are diagrams illustrating examples of information included in the PDCCH.
  • FIGS. 11A to 11D are diagrams illustrating an example of the feedback system 2.
  • FIG. FIG. 12 is a diagram illustrating an example of a protocol stack.
  • FIG. 13A is a diagram illustrating an example of RRC message exchange, and
  • FIG. 13B is a diagram illustrating a configuration example of the RRC message.
  • FIG. 14 is a diagram illustrating an example of the IE included in the PDCCH-Config.
  • FIG. 15A is a diagram illustrating a configuration example of a base station, and
  • FIG. 15B is a diagram illustrating a configuration example of a baseband signal processing unit.
  • FIG. 16A is a diagram illustrating a configuration example of a terminal, and FIG.
  • FIG. 16B is a diagram illustrating a configuration example of a baseband signal processing unit.
  • FIG. 17 is a sequence diagram illustrating an operation example.
  • 18 (A) to 18 (C) are diagrams illustrating transmission examples of PDCCH and PDSCH, and
  • FIG. 18 (D) is a diagram illustrating an example of HARQ-ACK @ Codebook, respectively.
  • FIG. 19 is a sequence diagram illustrating an operation example.
  • FIG. 20 is a diagram illustrating an example of a field included in the PDCCH.
  • FIGS. 21A and 21B are diagrams illustrating a transmission example of the PUSCH.
  • FIGS. 22A and 22B are diagrams illustrating a transmission example of the PUSCH.
  • FIG. 23A is a diagram illustrating an example of a hardware configuration of a base station
  • FIG. 23B is a diagram illustrating an example of a hardware configuration of a terminal
  • FIGS. 24A and 24B are diagrams illustrating transmission examples of TB
  • FIGS. 25A and 25B are sequence diagrams illustrating an operation example.
  • 3GPP specifications are updated as needed. Therefore, the latest specification at the time of filing the present application may be used as the above specification. Then, terms and technical contents described in the latest specification may be appropriately used in this specification.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10 according to the first embodiment.
  • the wireless communication system 10 includes a base station device (hereinafter, may be referred to as a “base station”) 100 and a plurality of terminal devices (hereinafter, may be referred to as “terminals”) 200-1 and 200-2. Prepare.
  • the base station 100 performs wireless communication with the terminals 200-1 and 200-2 located in the service provision range (or cell range) of the base station 100, and provides various services such as a call service and a Web browsing service. Wireless communication device.
  • the base station 100 performs the scheduling as described above, and determines the allocation of radio resources, the coding rate, the modulation scheme, and the like to each of the terminals 200-1 and 200-2. Then, base station 100 includes the scheduling result in the control signal and transmits the control signal to terminals 200-1 and 200-2 using the PDCCH. Each of the terminals 200-1 and 200-2 extracts data addressed to itself from the signal received using the PDSCH or transmits data to the base station 100 using the PUSCH according to the scheduling result included in the control signal. Can be sent.
  • the communication direction from the base station 100 to the terminals 200-1 and 200-2 may be referred to as the down direction, and the communication direction from the terminals 200-1 and 200-2 to the base station 100 may be referred to as the up direction.
  • the base station 100 is a transmitting device, and the terminals 200-1 and 200-2 are receiving devices.
  • the terminals 200-1 and 200-2 are transmitting devices and the base station 100 is a receiving device.
  • the terminals 200-1 and 200-2 can also transmit a control signal in the uplink direction.
  • the terminals 200-1 and 200-2 transmit the uplink control signal using PUCCH (Physical Uplink Control CHannel).
  • PUCCH Physical Uplink Control CHannel
  • the uplink control signal for example, there is an ACK signal or a NAK signal (hereinafter, may be referred to as “ACK” or “NACK”) indicating whether data has been normally received.
  • the terminals 200-1 and 200-2 are wireless communication devices capable of wireless communication, such as a feature phone, a smartphone, a personal computer, a tablet terminal, and a game device. Each of the terminals 200-1 and 200-2 can receive the various services described above via the base station 100.
  • the base station 100 performs wireless communication with two terminals 200-1 and 200-2.
  • the base station 100 may perform wireless communication with one terminal 200-1 or may perform wireless communication with three or more terminals.
  • the number of terminals 200-1 and 200-2 may be one or a plurality.
  • the base station 100 and the terminals 200-1 and 200-2 can perform wireless communication using the Unlicensed @ band.
  • each country gives a license to a specific operator and allocates the frequency used in the wireless communication.
  • the operator can perform a mobile communication business (or a wireless communication business) by occupying a licensed frequency.
  • the frequency band to which the operator is licensed and assigned may be referred to as, for example, Licensed @ band.
  • Unlimited @ band is a frequency band that can be used without a license by a plurality of operators, for example.
  • Unlicensed @ band is, for example, a frequency band that does not require a license
  • Licensed @ band is, for example, a frequency band that requires a license. Examples of the Unlicensed band include an ISM band (Industry Science Medical band) and a 5 GHz band.
  • the base station 100 and the terminals 200-1 and 200-2 confirm whether or not the frequency band can be used by using the LBT method when performing wireless communication using the Unlicensed @ band.
  • base station 100 and terminals 200-1 and 200-2 perform the following processing.
  • the base station 100 and the terminals 200-1 and 200-2 perform carrier sense in a usable frequency band of the unlicensed band.
  • the base station 100 and the terminals 200-1 and 200-2 perform wireless communication using the frequency band.
  • the “Idle” state is, for example, a state where the signal strength of the received signal is smaller than a threshold.
  • the base station 100 and the terminals 200-1 and 200-2 confirm that the frequency band is not used by another base station or terminal, and the frequency band can be used. .
  • the base station 100 and the terminals 200-1 and 200-2 do not use the frequency band.
  • the “Busy” state is, for example, a state when the signal strength of the received signal is equal to or higher than a threshold.
  • the base station 100 and the terminals 200-1 and 200-2 perform carrier sense again for the frequency band when a predetermined time has elapsed after confirming the "Busy" state.
  • the base station 100 and the terminals 200-1 and 200-2 can perform wireless communication using not only the Licensed band but also the Licensed band.
  • the Unlimited @ band may be described as, for example, an unlicensed band
  • the Licensed @ band may be described as, for example, a license band.
  • terminals 200-1 and 200-2 may be referred to as the terminal 200 in some cases.
  • the downlink control signal may be referred to as, for example, PDCCH. Therefore, transmitting a downlink control signal may be referred to as, for example, transmitting a PDCCH.
  • the downlink data may be referred to as, for example, PDSCH.
  • the uplink control signal may be referred to as PUCCH, and the uplink data may be referred to as PUSCH.
  • control signal and DCI may be used without distinction.
  • processing using the LBT method and performing carrier sensing may be used without distinction.
  • the gNB and the base station 100 and the UE and the terminal 200 may be used without distinction.
  • FIGS. 2A to 2D are diagrams illustrating transmission examples of a TB in a time direction in a frequency band having an unlicensed band.
  • FIGS. 2A to 2D show examples of transmission not only in the downlink direction but also in the uplink direction.
  • FIG. 2A shows an example in which data included in TB # 0 to TB # 2 is transmitted in order from the first symbol of the first slot.
  • base station 100 performs carrier sense on a certain frequency band in the unlicensed band, and confirms that it is in the “Idle” state at the time of the first symbol of the first slot. I do. Therefore, base station 100 transmits data included in TB # 0 using all symbols from the first symbol of the first slot.
  • the base station 100 also transmits data included in TB # 1 and TB # 2 using all 14 symbols of each slot.
  • terminal 200 performs carrier sense in the unlicensed band and confirms the “Idle” state at the time of the first symbol of the first slot. Data included in 0 to TB # 2 is transmitted.
  • the TB is divided into a plurality of CBGs (Code Block Group). Then, base station 100 or terminal 200 transmits the TB divided into CBGs.
  • CBGs Code Block Group
  • TB is, for example, a unit of an information bit sequence.
  • the TB may be, for example, at least one of a unit of an information bit sequence allocated to one slot and a scheduling unit.
  • CB Code @ Block
  • CB is a unit of information bits that can be input to an error correction encoder such as a turbo encoder. If TBS (Transport ⁇ Block ⁇ Size) exceeds, for example, the size that can be input to the error correction encoder, the TB is divided into a plurality of CBs.
  • a group of a plurality of CBs smaller than the number of CBs per TB is called, for example, CBG.
  • CBG the number of CBGs per TB can be set to 1, 2, 4, 6, and 8.
  • 1TB includes four CBGs.
  • the number of CBGs other than 4, such as 1, 2, 6, 8, etc. may be used.
  • FIG. 2A shows an example in which four CBGs (CBG # 0 to CBG # 3) are included in TB # 0, and all of the CBGs # 0 to CBG # 3 are transmitted.
  • FIG. 2E is a diagram showing a configuration example of one slot defined by 5G.
  • 14 symbols constitute one subframe, but in 5G, 14 symbols constitute 1 slot.
  • transmitting data included in a TB for example, transmitting a TB may be referred to as transmitting a TB.
  • FIG. 2 (B) is a diagram showing a transmission example of TB in the time direction, similarly to FIG. 2 (A). However, the example of FIG. 2B shows an example in which the transmission start timing is shifted due to carrier sense with respect to the example of FIG. 2A.
  • the base station 100 performs carrier sense and enters the “Idle” state at the third symbol of the first slot, and starts transmission from the third symbol.
  • carrier sense may be performed in units of two symbols.
  • carrier sense may be performed in units of one symbol, or carrier sense may be performed in units of three or more symbols.
  • the transmission start timing of the first slot can be shifted in the time direction.
  • the PDCCH and PDSCH are included in the head slot in the downlink direction.
  • base station 100 can shift the head symbol including the PDCCH and PDSCH in the time direction.
  • the PUSCH is included in the head slot in the uplink direction.
  • terminal 200 can shift the first symbol including the PUSCH in the time direction. If the PUCCH is further included in the head slot in the uplink direction, terminal 200 can shift the head symbol including the PUCCH and PUSCH in the time direction.
  • the base station 100 or the terminal 200 punctures data transmitted using the PDSCH or the PUSCH in the head slot in accordance with the actual transmission length in symbol units.
  • puncturing in symbol units is the same as puncturing CBGs in order.
  • part of CBG # 0 of TB # 0 is punctured, and the other CBG # 1 to CBG # 3 are transmitted as they are.
  • puncturing means, for example, not transmitting data.
  • the base station 100 and the terminal 200 do not transmit a portion of the data included in the CBG # 0 that is to be mapped to the Symbol # 0 and the Symbol # 1.
  • the transmission is started at the transmission start timing of the seventh symbol because the state is "Idle" at the time of the seventh symbol. Also in this case, CBG # 0 and CBG # 1 are punctured, and CBG # 2 and CBG # 3 are transmitted.
  • FIGS. 3 (A) to 3 (D) are diagrams showing transmission examples of a TB in the case of a mini slot.
  • the mini-slot is, for example, a slot in which the number of symbols included in one slot is smaller than 14 symbols.
  • Mini-slots are said to contribute to the realization of URLG (Ultra-Reliable and Low-Latency Communications), which is a 5G use case, for example.
  • FIG. 3 (A) shows an example in which all data of CBG # 0 to CBG # 3 included in TB # 0 is transmitted in the first mini slot.
  • the unlicensed band is in the “Idle” state, and the example is transmitted from the first symbol.
  • FIGS. 3B to 3D show examples of one symbol shift, two symbol shift, and three symbol shift, respectively.
  • CBG # 0 is punctured
  • CBG # 0 and CBG # 1 are punctured
  • CBG # 0 and CBG # 1 is punctured.
  • puncturing may be performed not only for a signal scheduled in units of one slot, but also for a signal scheduled in units of a number of symbols shorter than 14 symbols included in one slot.
  • FIGS. 4A to 4D are diagrams illustrating transmission examples of TB when puncturing is performed from the beginning.
  • FIGS. 4 (A) shows an example in which TB # 0 is transmitted from the first symbol of the first slot
  • FIGS. 4 (B) to 4 (D) show that TB # 0 is shifted by 2 symbols, 4 symbols and 6 symbols. Are respectively transmitted.
  • the base station 100 or the terminal 200 shifts the leading symbol in the time direction, thereby adjusting the leading symbol in accordance with the shortened resource length. Puncture in order from CBG. That is, base station 100 or terminal 200 punctures CBG # 1, CBG # 2, and CBG # 3 in order from CBG # 0 assigned to PDSCH before CBG # 1 to # 3 in the time direction.
  • the base station 100 or the terminal 200 performs the following processing.
  • One slot includes Symbol # 0 to Symbol # 13.
  • base station 100 or terminal 200 punctures CBG (CBG # 0) assigned to Symbol # 0 and Symbol # 1.
  • base station 100 or terminal 200 punctures CBG (CBG # 0) allocated to Symbol # 0 to Symbol # 3 when shifting four symbols, and shifts Symbol # 0 to Symbol # 5 when shifting six symbols.
  • CBG # 0 and CBG # 1 are punctured (CBG # 0 and CBG # 1) assigned to the.
  • the base station 100 and the terminal 200 can realize puncturing from the beginning It is.
  • Such a definition may be determined, for example, according to specifications, or may be performed by exchanging an RRC (Radio Resource Control) message containing such a definition between the base station 100 and the terminal 200.
  • RRC Radio Resource Control
  • 2 (A) to 2 (D) show an example of puncturing from the beginning.
  • the radio resource shortened by the shift may include an RS (reference signal: Reference ⁇ ⁇ Signal).
  • RS reference signal: Reference ⁇ ⁇ Signal
  • puncturing (data included in) CBG assigned to Symbol may be referred to as puncturing Symbol, for example.
  • puncturing a CBG and puncturing data included in the CBG are used without distinction.
  • FIGS. 5A to 5D are diagrams illustrating transmission examples of TB when puncturing is performed from behind.
  • FIGS. 5 (A) shows an example in which TB # 0 is transmitted from the first symbol of the first slot
  • FIGS. 5 (B) to 5 (D) show a case where TB # 0 is shifted by 2, 4 and 6 symbols. Are respectively transmitted.
  • FIG. 5A shows an example in which all CBGs # 0 to # 3 included in TB # 0 are transmitted.
  • CBG # 3 which is the last CBG of TB # 0 is punctured by a two-symbol shift.
  • CBG # 3 and CBG # 2 immediately before CBG # 3 are punctured by four symbol shift.
  • CBG # 3 and CBG # 2 are punctured.
  • the base station 100 or the terminal 200 shifts the first symbol in the time direction, and thereby adjusts the last symbol according to the shortened resource length. Is punctured in the order from the CBG to the front CBG.
  • the base station 100 and the terminal 200 perform the following processing.
  • the base station 100 or the terminal 200 punctures Symbol # 12 and Symbol # 13 when shifting by two symbols. Also, base station 100 or terminal 200 punctures Symbol # 10 to Symbol # 13 when shifting by four symbols, and punctures Symbol # 8 to Symbol # 13 when shifting six symbols. Which Symbol is to be punctured may be determined, for example, by specification or may be determined by exchanging RRC messages.
  • FIGS. 6A to 6D are diagrams illustrating transmission examples of TB when puncturing is performed from the center.
  • FIGS. 6 (A) shows an example in which TB # 0 is transmitted from the first symbol of the first slot
  • FIGS. 6 (B) to 6 (D) show that TB # 0 is shifted by 2 symbols, 4 symbols and 6 symbols. Are respectively transmitted.
  • FIG. 6 (A) shows an example in which all CBGs # 0 to # 3 included in TB # 0 are transmitted.
  • CBG # 2 of TB # 0 is punctured by two-symbol shift.
  • CBG # 2 and CBG # 3 are punctured by shifting four symbols.
  • CBG # 2 and CBG # 3 are punctured.
  • the base station 100 or the terminal 200 shifts the first symbol in the time direction, and thereby adjusts the center symbol in accordance with the shortened resource length. Puncture in order from CBG.
  • the base station 100 and the terminal 200 perform the following processing.
  • base station 100 or terminal 200 punctures Symbol # 8 and Symbol # 9. Also, base station 100 or terminal 200 punctures Symbol # 8 to Symbol # 11 when shifting by four symbols, and punctures Symbol # 8 to Symbol 13 when shifting six symbols. Which Symbol is to be punctured may be determined, for example, by specification or may be determined by exchanging RRC messages.
  • the PDCCH may be included in the first symbol of each slot. Therefore, as the puncturing, an example of puncturing from the rear or an example of puncturing from the center is desirable. In the following, various examples will be described, but puncturing will be described with an example of puncturing from the back.
  • the data of the untransmitted portion punctured in this way can be transmitted in the slot next to the first slot in the downlink direction. That is, base station 100 transmits the data of the untransmitted portion in the slot next to the head slot without waiting for NAK from terminal 200. This allows the base station 100 to transmit the data of the untransmitted portion without waiting for the NAK, as compared with, for example, the case where the transmission is performed after waiting for the NAK, so that the throughput can be improved. .
  • the PDCCH for retransmission includes, for example, a scheduling result for a CBG in an untransmitted portion. Therefore, terminal 200 can use the PDCCH for retransmission to determine which resource is assigned the CBG of the untransmitted portion, and receive the CBG of the untransmitted portion using the resource. be able to.
  • the feedback method there are a method of feeding back ACK or NAK in TB units and a method of feeding back ACK or NAK in CBG units.
  • the former may be referred to as feedback system 1 and the latter may be referred to as feedback system 2.
  • HARQ-ACK When ACK and NAK are collectively described, for example, HARQ-ACK may be referred to.
  • the ACK or NAK is, for example, a response signal indicating whether or not data has been correctly received (or decoded) by the receiving device.
  • FIGS. 7A to 7D are transmission examples of TB, and are diagrams illustrating an example of feedback system 1.
  • FIG. This is also an example of puncturing from behind as described above.
  • transmission starts in order from the first symbol of the first slot, so that in the first slot, all CBG # 0 to CBG # 3 included in TB # 0 are transmitted.
  • the first symbol includes a PDCCH for TB # 0 initial transmission (hereinafter, may be referred to as “TB # 0 PDCCH for initial transmission”).
  • FIG. 8 is a diagram illustrating an example of a field included in DCI (Downlink Control Information) transmitted using the PDCCH.
  • the PDCCH for TB # 0 initial transmission also includes each feed shown in FIG.
  • DCI includes TDRA (Time Domain Resource Assignment), NDI (New Data Indicator), HARQ process number (HARQ Process number), RV (Redundancy Version), and MCS (Modulation Coding Scheme). Also, the DCI includes CBGTI (Code ⁇ Block ⁇ Group ⁇ Transmission ⁇ Information) and DAI (Downlink ⁇ Assignment ⁇ Index).
  • TDRA Time Domain Resource Assignment
  • NDI New Data Indicator
  • HARQ process number HARQ Process number
  • RV Redundancy Version
  • MCS Modulation Coding Scheme
  • CBGTI Code ⁇ Block ⁇ Group ⁇ Transmission ⁇ Information
  • DAI Downlink ⁇ Assignment ⁇ Index
  • $ TDRA is, for example, a field in which a resource in the time direction is specified.
  • TDRA is represented by a start symbol S and a length L.
  • the start symbol S represents, for example, a start symbol of a slot.
  • the length L represents, for example, the number (or length) of consecutive symbols counted from the start symbol S.
  • the start symbol S is defined as a symbol that can actually start transmission of a transmission burst in consideration of the shift of the PDCCH and PDSCH in the time direction. For example, in the example of FIG.
  • the NDI is used to identify retransmission data or new data by comparing with the previous NDI.
  • FIG. 9 is a diagram illustrating an example of NDI.
  • the base station (gNB) 100 first transmits “0” as NDI, and retransmits TB # a because the terminal 200 has returned a NAK. In this case, the base station 100 transmits “0” represented as NDI again without performing Toggle (or bit inversion) as NDI. The terminal 200 can recognize that the received TB # a is retransmission data because the NDI bit is not toggled.
  • the base station 100 transmits TB # a ′ different from TB # a as new data. In this case, the base station 100 toggles the bit “0” of the NDI and transmits “1”. Since the terminal 200 has received “1” as the NDI, it can recognize that TB # a ′ is new data.
  • the HARQ process number indicates, for example, an identification number of a buffer for each TB that stores the TB.
  • the HARQ process numbers when they are the same, they represent the same TB, and when they are different, they represent different TBs.
  • RV represents, for example, the version of the encoded data.
  • base station 100 transmits an RV different from the previously transmitted RV, so that terminal 200 can improve the coding gain for the retransmission data.
  • MCS indicates, for example, a coding rate and a modulation scheme.
  • the DAI indicates, for example, a position in the HARQ-ACK codebook.
  • the HARQ-ACK codebook is, for example, for collectively transmitting when the terminal 200 feeds back ACK or NAK, and can be collectively fed back in one transmission. Details of the DAI will be described later.
  • FIG. 10 (A) is a diagram illustrating an example of DCI of the PDCCH for TB # 0 initial transmission.
  • TB # 0 initial transmission PDCCH includes, for example, DCI shown in FIG. 10A.
  • the DCI included in the PDCCH for initial transmission remains in the time direction.
  • the content is the same as the DCI included in the PDCCH for initial transmission in FIG. 7A that transmits without shifting.
  • TB # 0 retransmission PDCCH a PDCCH for TB # 0 retransmission
  • FIG. 7 (B) “TB0 # for retransmission” is described, but actually, for example, indicates that CBG of an untransmitted portion of TB # 0 is transmitted. In the following, retransmission and transmission of an untransmitted portion may be used without distinction.
  • the DCI of the TB # 0 retransmission PDCCH includes, for example, each feed shown in FIG. 8, and FIG. 10B is a diagram illustrating a specific example of the TB # 0 retransmission PDCCH in the example of FIG. 7B. .
  • the CBG of the untransmitted portion has the fifth symbol (Symbol # 4) as the start symbol and its length. This means that four symbols are allocated.
  • the NDI, HARQ process number, and RV have the same contents as the NDI, HARQ process number, and RV included in the PDCCH for initial transmission (FIG. 10A).
  • the same HARQ process number indicates that the same TB (TB # 0) is being transmitted in the same retransmission process. Also, since the NDI is the same, it is not the transmission of new data, but the RV is the same, indicating that it is not a retransmission, for example. Therefore, by making the NDI, HARQ process number, and RV the same, for example, transmission of an “untransmitted portion” of the same TB is represented.
  • the PDCCH for TB # 0 retransmission includes CBGTI, and indicates which CBG is a CBG for retransmission of an untransmitted portion.
  • the TB # 0 initial transmission PDCCH issues a transmission instruction. Indicates that the unsent portion is sent.
  • the CBGTI of the TB # 0 retransmission PDCCH indicates which CBG is to be transmitted as the untransmitted portion CBG in the TB # 0.
  • FIG. 7C shows an example in which the symbol is shifted by 4 symbols.
  • FIG. 7D shows an example in which the symbol is shifted by 6 symbols.
  • the transmission of the data part that could not be transmitted in the next TTI is performed by, for example, “Cross @ TTI”. (Or cross TTI).
  • the cross TTI means, for example, that the same data is transmitted across a plurality of TTIs.
  • TB # 0 is transmitted by cross TTI.
  • the TTI is, for example, an arrival time interval of a TB set, and represents a minimum period of a scheduling period (or cycle) allocated by one control signal transmitted using the PDCCH. Therefore, the TTI is allowed to include a plurality of TTIs by one PDCCH, for example.
  • FIG. 10 (C) is a diagram illustrating an example of a PDCCH included in the same symbol as the TB # 0 retransmission PDCCH.
  • the PDCCH includes TDRA for data included in a slot next to the first slot.
  • terminal 200 can recognize that the PDCCH is for a different TB, and It is possible to distinguish.
  • terminal 200 when terminal 200 normally receives (or decodes) all data (CBG # 0 to CBG # 3) included in TB # 0, ACK or NAK in TB units Feedback. Therefore, terminal 200 can determine ACK or NAK when CBG # 3 is received in the slot next to the first slot, and can provide feedback.
  • 11 (A) to 11 (D) are transmission examples of TB, and are diagrams illustrating an example of feedback system 2.
  • FIG. This is also an example of puncturing from behind as described above.
  • FIGS. 7 (A) to 7 (D) show transmission examples of the same TB as FIGS. 7 (A) to 7 (D), which are examples of the feedback method 1, for example.
  • terminal 200 feeds back HARQ-ACK in CBG units.
  • terminal 200 transmits ACK or NAK for each of CBG # 0 to CBG # 3.
  • terminal 200 uses the HARQ @ ACK codebook to collectively feed back ACK or NAK for each of CBGs # 0 to # 3 in one transmission.
  • FIG. 12 is a diagram illustrating an example of a protocol stack between the UE and the gNB in 5G. As shown in FIG. 12, the PDCCH is included in the lowest physical layer (PHY), and the RRC message is included in an RRC layer higher than the physical layer.
  • PHY physical layer
  • RRC Radio Resource Control
  • the PDCCH is transmitted, for example, for each TTI. Therefore, the PDCCH has a larger overhead than the RRC message, but can change the control in real time and has flexibility.
  • the RRC message is transmitted, for example, every several hundred ms. Therefore, the RRC message has less overhead than the PDCCH, but it is difficult to change the control in real time, and the RRC message is less flexible.
  • the PDCCH and the RRC message have a trade-off relationship with respect to overbed and flexibility, for example.
  • FIG. 13 is a diagram illustrating an example of exchange of RRC messages between the terminal (UE) 200 and the base station (Network) 100.
  • the base station 100 transmits an RRCReconfiguration message to the terminal 200 (S10).
  • the terminal 200 upon receiving the RRCReconfiguration message, transmits an RRCReconfigurationComplete message to the base station 100 (S11).
  • FIG. 3B is a diagram illustrating a configuration example of the RRCReconfiguration message.
  • the RRCReconfiguration message includes various contents in a hierarchical structure, and a part of the RRCReconfiguration message includes the PDCCH-Config.
  • the PDCCH-Config is used to set UE-specific PDCCH parameters such as a control resource set (CORESET: control resource set) and a search space, for example.
  • CORESET control resource set
  • IE Information @ Element
  • base station 100 performs feedback scheme 1 and feedback scheme 2, and further, a scheme of performing transmission in TB units and performing HARQ-ACK feedback in TB units (hereinafter referred to as “conventional scheme”). 3) (or modes) may be selected in the RRC setting.
  • FIG. 14 is a diagram illustrating an example of an IE included in the PDCCH-Config.
  • the PDCCH-Config includes an IE indicating the number of CBGs per TB and an IE indicating whether the feedback unit is a TB unit or a CBG unit.
  • the number of CBGs per TB is “1”, and the unit of feedback is “0”.
  • the base station 100 generates an RRCReconfiguration message including such a PDCCH-Config and transmits the generated RRCReconfiguration message to the terminal 200, so that the base station 100 and the terminal 200 share which of the three methods will be used, It becomes possible to carry out the method.
  • FIG. 15A is a diagram illustrating a configuration example of the base station 100.
  • the base station 100 includes a transmission path interface 110, a baseband signal processing unit 120, an RF (Radio Frequency) transmission / reception unit (or a transmission unit or a reception unit) 130, and an antenna 140.
  • the base station 100 may be, for example, a gNB defined in 5G.
  • the transmission line interface 110 receives packet data transmitted from an upper station or another base station, and extracts data and the like from the received packet data.
  • the transmission line interface 110 outputs the extracted data to the baseband signal processing unit 120. Further, the transmission line interface 110 receives data output from the baseband signal processing unit 120, generates packet data including the input data, and transmits the generated packet data to an upper station or another base station. I do.
  • the baseband signal processing unit 120 performs, for example, processing on data in a baseband.
  • FIG. 15B is a diagram illustrating a configuration example of the baseband signal processing unit 120.
  • the baseband signal processing unit 120 includes a reception signal processing unit 121, a control unit 122, a PDCCH generation unit 123, a PDSCH generation unit 124, and a mapping unit 125.
  • the received signal processing unit 121 receives, for example, data (PUSCH) transmitted from a certain terminal 200 and control based on the baseband signal output from the RF transmitting / receiving unit 130 according to the uplink scheduling result output from the control unit 122.
  • a signal (PUCCH) is extracted.
  • the reception signal processing unit 121 outputs the extracted data, control signal, and the like to the control unit 122. Further, reception signal processing section 121 receives ACK or NAK transmitted from terminal 200 and outputs the received ACK or NAK to control section 122. Received signal processing section 121 receives ACK or NAK using PUCCH or PUSCH.
  • the control unit 122 performs scheduling when performing wireless communication with the terminal 200, for example, and outputs the scheduling result to the PDCCH generation unit 123.
  • the scheduling result output to PDCCH generating section 123 includes the respective scheduling results in the downlink and uplink directions.
  • Control section 122 outputs the downlink scheduling result to mapping section 125 and the uplink scheduling result to reception signal processing section 121, respectively.
  • the control unit 122 outputs the data output from the transmission line interface 110 to the PDSCH generation unit 124.
  • control unit 122 generates an RRC message and outputs the generated RRC message to the PDSCH generation unit 124.
  • PDCCH generating section 123 generates a control signal (or DCI) including the scheduling result for the scheduling result output from control section 122.
  • PDCCH generating section 123 generates, for example, DCI shown in FIG.
  • the information included in each field of the DCI may be generated by, for example, the control unit 122.
  • the PDCCH generation unit 123 collects the information and forms one DCI as illustrated in FIG.
  • the DCI may be generated so as to have the following format.
  • PDCCH generating section 123 outputs the generated control signal to mapping section 125.
  • PDSCH generating section 124 outputs the data output from control section 122 to mapping section 125.
  • the PDSCH generation unit 124 may output this data as a PDSCH, for example.
  • PDSCH generating section 124 outputs the RRC message output from control section 122 to mapping section 125.
  • the mapping unit 125 maps the control signal output from the PDCCH generation unit 123 and the data output from the PDSCH generation unit 124 to a predetermined area on the radio resource according to the downlink scheduling result output from the control unit 122. Map. Mapping section 125 outputs the mapped control signal and data to RF transmitting / receiving section 130.
  • ⁇ Mapper 125 maps the RRC message output from PDSCH generator 124 to a predetermined area on the radio resource, and outputs the mapped RRC message to RF transceiver 130.
  • the RF transmitting / receiving unit 130 performs frequency conversion of the control signal and the data output from the baseband signal processing unit 120 and the RRC message into a wireless signal of a wireless band, and converts the converted wireless signal.
  • the signal is output to antenna 140.
  • the RF transmitting / receiving unit 130 performs frequency conversion of the radio signal output from the antenna 140 to a baseband signal of a baseband, and outputs the baseband signal after the frequency conversion to the baseband signal processing unit 120.
  • Antenna 140 transmits the radio signal output from RF transmitting / receiving section 130 to terminal 200.
  • antenna 140 receives a wireless signal transmitted from terminal 200 and outputs the received wireless signal to RF transmitting / receiving section 130.
  • FIG. 16A is a diagram illustrating a configuration example of the terminal 200.
  • the terminal 200 includes an antenna 210, an RF transmitting / receiving unit (or a transmitting unit or a receiving unit) 220, a baseband signal processing unit 230, and an application unit 240.
  • Antenna 210 receives a radio signal transmitted from base station 100 and outputs the received radio signal to RF transmitting / receiving section 220. Further, antenna 210 transmits the radio signal output from RF transmitting / receiving section 220 to base station 100.
  • RF transmitting / receiving section 220 performs frequency conversion on the radio signal output from antenna 210 to convert the signal into a baseband signal, and outputs the converted baseband signal to baseband signal processing section 230. Further, RF transmitting / receiving section 220 performs frequency conversion of the baseband signal output from baseband signal processing section 230 to a wireless signal in a wireless band, and outputs the converted wireless signal to antenna 210.
  • the baseband signal processing unit 230 performs, for example, processing on a baseband signal.
  • FIG. 16B is a diagram illustrating a configuration example of the baseband signal processing unit 230.
  • the baseband signal processing unit 230 includes a PDCCH reception processing unit 231, a PDSCH reception processing unit 232, a control unit 234, a PUSCH generation unit 235, a PUCCH generation unit 236, and a mapping unit 237.
  • the PDCCH reception processing unit 231 extracts a control signal (PDCCH) from the baseband signal output from the RF transmission / reception unit 220.
  • PDCCH reception processing section 231 outputs the downlink scheduling result among the extracted control signals to PDSCH reception processing section 232, and outputs the uplink scheduling result to control section 234.
  • PDCCHs to be extracted include, for example, a TB # 0 initial transmission PDCCH shown in FIG. 10A and a TB # 0 retransmission PDCCH shown in FIG. 10B.
  • PDSCH reception processing section 232 extracts data and RRC messages assigned to its own station from the baseband signal output from RF transmission / reception section 220 according to the downlink scheduling result output from PDCCH reception processing section 231.
  • the PDSCH reception processing unit 232 outputs the extracted data and the RRC message to the control unit 234.
  • the control unit 234 performs reception processing and transmission processing according to, for example, the RRC message output from the PDSCH reception processing unit 232.
  • the feedback scheme is set in the RRC message
  • the feedback scheme is set according to the contents of the IE (for example, FIG. 14) included in the PDCCH-Config, and the HARQ-ACK is fed back according to the setting.
  • the control unit 234 outputs the data output from the PDSCH reception processing unit 232 to the application unit 240.
  • control section 234 outputs the uplink scheduling result output from PDCCH reception processing section 231 to mapping section 237.
  • control unit 234 outputs the data output from the application unit 240 to the PUSCH generation unit 235. Further, control section 234 generates information included in the uplink control signal, and outputs the generated information to PUCCH generation section 236.
  • PUSCH generating section 235 outputs data (PUSCH) output from control section 234 to mapping section 237.
  • PUCCH generating section 236 generates an uplink control signal (PUCCH) from the information output from control section 234, and outputs the generated control signal to mapping section 237.
  • PUCCH uplink control signal
  • Mapping section 237 maps data to radio resources according to the uplink scheduling result output from control section 234. When a control signal is also output from control section 234, mapping section 237 maps the data and the control signal to radio resources. Mapping section 237 outputs the mapped data (or data and control signal) to RF transmitting / receiving section 220 as a baseband signal.
  • the application unit 240 performs, for example, processing related to the application on the data output from the baseband signal processing unit 230. Further, the application unit 240 generates data by performing a process related to the application, for example, and outputs the generated data to the control unit 234.
  • FIG. 17 is a diagram illustrating an operation example of the feedback system 1.
  • the example shown in FIG. 17 also shows an example in which TB # 0 is transmitted in the first slot, and TB # 0 includes four CBGs (CBG # 0 to CBG # 3).
  • the base station (gNB) 100 performed carrier sense three times for the unlicensed band, and all were in the “Busy” state. Therefore, base station 100 cannot transmit TB # 0 (S20). For example, the base station 100 performs the following processing.
  • control unit 122 outputs data included in TB # 0 to PDSCH generation unit 124, and outputs the scheduling result to PDCCH generation unit 123 and mapping unit 125.
  • the control unit 122 generates “1111” as CBG transmission information and outputs it to the PDCCH generation unit 123.
  • PDCCH generation section 123 generates a PDCCH (TB # 0 initial transmission PDCCH) including a scheduling result, CBG transmission information, and the like
  • PDSCH generation section 124 generates a PDSCH and outputs it to mapping section 125, respectively.
  • Mapping section 125 maps PDCCH and PDSCH to radio resources according to the scheduling result. Mapping section 125 stores the mapped PDCCH and PDSCH in an internal memory.
  • received signal processing section 121 measures the received signal strength of the unlicensed band and outputs the result to control section 122. Since the received signal strength is higher than the threshold value, control section 122 determines that the state is “Busy”, and outputs the result to mapping section 125. Upon receiving the determination result from the control unit 122, the mapping unit 125 ends the processing without reading out the data and the control signal from the internal memory.
  • the base station 100 transmits the PDCCH and the PDSCH because the unlicensed band is in the “Idle” state by the fourth carrier sense (S21, S22).
  • the PDCCH is a TB # 0 initial transmission PDCCH.
  • the base station 100 performs the following processing.
  • control unit 122 determines that the unlicensed band is in the “Idle” state, and the unlicensed band is changed by another device. Make sure it is not used. Then, control section 122 shifts the symbol including the PDCCCH and the PDSCH in the time direction until the transmission start timing at which the state becomes “Idle”. In the example of FIG. 7D, the shift is performed by 6 symbols. The control unit 122 shifts within the range of the radio resource in the time direction allocated to the transmission of the PDSCH (or PUSCH) by one PDCCH. In the example of FIG.
  • control unit 122 performs the shift in the range from Symbol0 to Symbol13. Control unit 122 outputs the shifted result to mapping unit 125. Further, control unit 122 determines which CBG is to be punctured according to the number of symbols to be shifted. For example, when shifting by six symbols, the control unit 122 punctures a CBG including data allocated to Symbol # 8 to Symbol # 13. When puncturing CBGs assigned to Symbol # 8 to Symbol # 13, CBG # 2 and CBG # 3 are assigned to these symbols as shown in FIG. 7A. Control unit 122 determines to puncture CBG # 2 and CBG # 3, and transmits data included in other CBG # 0 and # 1 without transmitting data included in CBG # 2 and CBG # 3.
  • mapping section 125 It instructs mapping section 125 to transmit. That is, the control unit 122 determines which symbol is to be punctured from the rear (or from the front or from the center) according to the specification or the like according to the symbol to be shifted, and the data assigned to the symbol in the scheduling is determined by which CBG Is determined to determine which CBG is to be punctured. Then, control unit 122 outputs the determination result of the CBG to be punctured to mapping unit 125. Mapping section 125 reads the PDCCH and the PDSCH included in the unpunctured CBG from the internal memory according to the result of the determination, and outputs the read PDCCH to RF transmitting / receiving section 130.
  • Mapping section 125 or RF transmitting / receiving section 130 transmits the control signal and the data included in the non-punctured CBG (for example, the data included in non-punctured CBG # 0 and CBG # 1) to the PDCCH and PDSCH. It transmits to terminal 200 using each.
  • the base station 100 transmits the PDCCH in the slot next to the head slot (or the slot that transmitted the unpunctured CBG), and uses the PDSCH for the punctured untransmitted CBG. And transmit (S23, S24).
  • the PDCCH in this case is, for example, a TB # 0 retransmission PDCCH.
  • the base station 100 performs the following processing.
  • control unit 122 has determined the CBG to be punctured in S22. Therefore, the control unit 122 generates CBG transmission information (“0011” in the example of FIG. 7A) as an instruction to transmit a punctured CBG. Further, control section 122 performs scheduling on data included in the untransmitted CBG, and outputs the result to PDCCH generation section 123 and mapping section 125. PDCCH generating section 123 generates a TB # 0 retransmission PDCCH including CBG transmission information and the like, and outputs the generated PDCCH to mapping section 125. Further, control unit 122 instructs mapping unit 125 to transmit an untransmitted CBG.
  • CBG transmission information (“0011” in the example of FIG. 7A) as an instruction to transmit a punctured CBG.
  • control section 122 performs scheduling on data included in the untransmitted CBG, and outputs the result to PDCCH generation section 123 and mapping section 125.
  • PDCCH generating section 123 generates a TB # 0
  • mapping section 125 reads out the data contained in the punctured CBG from the internal memory. Then, mapping section 125 maps data (PDSCH) and PDCCH (TB # 0 retransmission PDCCH) included in the punctured CBG according to the scheduling result from control section 122, and transmits the mapped PDCCH and PDSCH. I do.
  • the terminal 200 feeds back ACK in TB units (S25). For example, the terminal 200 performs the following processing.
  • the PDSCH reception processing unit 232 outputs to the control unit 234 whether or not the PDSCH for initial transmission received in S22 has been successfully decoded.
  • the PDSCH reception processing unit 232 decodes the PDSCH of the untransmitted portion received in S24 together with the PDSCH received in S22, and outputs to the control unit 234 whether or not decoding was successful.
  • the control unit 234 generates an ACK based on the result of normal decoding according to the latter result, and transmits the ACK to the base station 100 via the PUCCH generation unit 236 or the PUSCH generation unit 235.
  • the following processing may be performed.
  • the base station 100 is allowed to transmit the PDCCH (S23) related to the same TB # 0 between the timing of transmitting the PDCCH in S21 and the timing of HARQ-ACK feedback in S25. Then, let us consider a case where the interval between the PDSCH reception timing (S24) specified by the second PDCCH (S23) and the HARQ-ACK feedback timing (S25) in the terminal 200 is equal to or larger than the threshold. In this case, terminal 200 feeds back the result of decoding the first PDSCH (S22) and the second PDSCH (S24) together as HARQ-ACK.
  • the terminal 200 decodes the data received at the first time and the data of the untransmitted portion together if the time until the ACK is transmitted (S25) after receiving the data of the untransmitted portion in S24 is sufficient. The result is fed back as ACK or NAK.
  • terminal 200 feeds back the result of decoding the first PDSCH (S22) as HARQ-ACK. That is, if there is not enough time to transmit the ACK after receiving the data of the untransmitted portion, terminal 200 feeds back the result of decoding the data received first time as ACK or NAK.
  • the threshold value indicates, for example, the processing time in the terminal 200. Such processing is performed, for example, in PDSCH generating section 124 of terminal 200, and the decoding result is output to control section 234, and control section 234 generates ACK or NAK according to the decoding result.
  • FIG. 17 also shows an operation example of the feedback system 2.
  • terminal 200 receives the data included in the CBG of the untransmitted portion of TB # 0 (S24), and transmits ACK or NACK according to the decoding result of each CBG (S26).
  • terminal 200 transmits "ACK" in the order of CBG # 0, CBG # 1, CBG # 2, and CBG # 3. , ACK, ACK, ACK "are fed back to the base station 100.
  • the terminal 200 performs the following processing.
  • the PDSCH reception processing unit 232 receives CBG # 0 and CBG # 1 and does not receive CBG # 2 and CBG # 3 due to the first PDSCH reception (S22). Therefore, the PDSCH reception processing unit 232 notifies the control unit 234 that CBG # 0 and CBG # 1 can be decoded normally, and CBG # 3 and CBG # 4 cannot be decoded normally. Further, the PDSCH reception processing unit 232 receives CBG # 3 and CBG # 4 because the CBG transmission information is “0011” by the second PDSCH reception, and normalizes CBG # 3 and CBG # 4. The control unit 234 is notified that the decryption was successful.
  • the control unit 234 receives these notifications, generates an ACK for each CBG, and feeds back an ACK to the base station 100. As described above, if the interval from the reception of S24 to the transmission of S26 is equal to or greater than the threshold, the control unit 234 feeds back the decoding result of the first and second PDSCHs together. The result of the first decoding may be fed back.
  • Terminal 200 does not transmit the results of each of CBGs # 0 to # 3 but collectively feeds them back in one transmission. Therefore, terminal 200 uses HARQ-ACK @ Codebook.
  • HARQ-ACK @ Codebook is specified in, for example, 3GPP@TS38.213.
  • FIG. 18 (A) to 18 (C) are diagrams illustrating transmission examples of PDCCH and PDSCH
  • FIG. 18 (E) is a diagram illustrating an example of HARQ-ACK Codebook.
  • HARQ-ACK ⁇ Codebook is, for example, an arrangement of bits indicating ACK or NACK.
  • the DAI is indicated in HARQ-ACK @ Codebook.
  • FIG. 18 (A) to 18 (C) show transmission examples of PDCCH and PDSCH for each frequency.
  • FIG. 18 (A) shows CC (Component @ Carrier) # 1
  • FIG. 18B shows CC # 2
  • FIG. 18C shows CC # 3.
  • NACK is mapped to the same position by HARQ-ACK @ Codebook.
  • the ACK or NAK of TB # 0 in the first slot and the ACK or NAK of TB # 0 in the untransmitted portion of the next slot are mapped to the same position "1" in HARQ-ACK @ Codebook. You. Compared to the case where HARQ-ACK Codebook is mapped to different positions for initial transmission and retransmission and ACK or NAK is transmitted with 2 bits, only 1-bit feedback is required in this scheme, and feedback is not performed. Transmission efficiency can be improved.
  • FIG. 19 is a diagram illustrating an operation example of a modified example of the feedback method 1.
  • the PDCCH of Type 1 is, for example, a PDCCH that includes a field of the number of continuous transmission slots when collectively transmitting continuous slots and does not include a field of CBG transmission information.
  • the PDCCH of Type 1 allows the base station 100 to schedule a plurality of slots collectively. Such scheduling may be referred to as, for example, multi-slot scheduling.
  • the PDCCH of Type 2 is, for example, a PDCCH including CBG transmission information.
  • the TB # 0 initial transmission PDCCH and the TB # 0 retransmission PDCCH are Type 2 PDCCHs.
  • the PDCCH shown in FIG. 8 is also a Type 2 PDCDCH, and the Type 2 PDCCH includes, for example, the fields shown in FIG.
  • scheduling using the PDCCH of Type 2 may be referred to as, for example, single-slot scheduling. In single slot scheduling, for example, scheduling is performed in units of one slot.
  • FIG. 20 is a diagram illustrating an example of a field included in the PDCCH of Type 1.
  • Type 1 does not include a field of CBG transmission information (or CBGTI), but includes a field of the number of continuous transmission slots.
  • the field of the number of consecutive slots includes, for example, the number of slots in the case of continuous slot transmission. In the example of FIG. 19, the number of consecutive measurement slots is “4”.
  • the base station 100 performed carrier sense three times in a frequency band having an unlicensed band, and all were in the “Busy” state (S20). Since the base station 100 is in the “Idle” state by the fourth carrier sense, the base station 100 transmits a PDCCH of Type 1 and PDSCHs (TB # 0 to TB # 3) for four consecutive slots specified by the PDCCH ( S31 to S35). For example, the base station 100 performs the following processing.
  • control unit 122 performs scheduling for the four TBs # 0 to # 3, and outputs a scheduling result including the number of continuous transmission slots (“4” in the example of FIG. 19) to the PDCCH generation unit 123.
  • PDCCH generating section 123 generates a PDCCH of Type 1 including the scheduling result, and outputs the generated PDCCH to mapping section 125.
  • the mapping unit 125 stores the PDSCH output from the PDSCH generation unit 124 and the PDCCH of Type 1 in an internal memory.
  • Control section 122 shifts the symbol including the PDCCCH and PDSCH in the time direction until the transmission start timing at which the state becomes “Idle”, and outputs the shift result to mapping section 125.
  • control unit 122 determines a CBG to be punctured based on the shift result, and outputs the result to mapping unit 125.
  • the control unit 122 determines to puncture CBG # 2 and CBG # 3 of TB # 0.
  • the mapping unit 125 reads the Type 1 PDCCH and the unpunctured PDSCH from the internal memory according to the shift result and the determination result of the CBG to be punctured, and outputs them to the RF transmitting / receiving unit 130.
  • the mapping section 125 or the RF transmitting / receiving section 130 transmits the Type 1 PDCCH (control signal) and the unpunctured PDSCH (in the example of FIG. 19, CBG # 2 and CBG # 3 of TB # 0, and TB # 1 to # 3). ) Is transmitted to the terminal 200.
  • the base station 100 divides the PDCCH of Type 2 (for example, the PDCCH for TB # 0 retransmission) and the PDSCH of the punctured untransmitted portion by shifting in the time direction at the time of initial transmission (for example, the Is transmitted to the terminal 200 (S36, S37).
  • the base station 100 transmits a PDCCH including “0011” as CBG transmission information, and transmits data of the untransmitted portions of the CBG # 3 and CBG # 4 using the PDSCH.
  • the processing of S36 and the processing of S37 are the same as, for example, S23 and S24 of the feedback method 1 respectively.
  • terminal 200 feeds back ACK or NAK to base station 100 according to the decoding results for TB # 0 to TB # 3.
  • the terminal 200 transmits “ACK, ACK, ACK, ACK” in the order of TB # 0, TB # 1, TB # 2, and TB # 3 in order to feed back in TB units.
  • terminal 200 determines the HARQ based on the decoding result obtained by decoding the PDSCH received in S32 to S35 and the PDSCH received in S37 together. Feedback as ACK.
  • the terminal 200 feeds back as HARQ-ACK based on the PDSCH decoding result received in the first time from S32 to S35.
  • FIGS. 21A and 21B are diagrams illustrating an example of transmission of an uplink TB.
  • the base station 100 transmits an untransmitted portion from the terminal 200 using the PUSCH, in the case of Grant based based shown in FIG. 21A, and in AUL (Autonomous UL transmission) shown in FIG. 21B. It may be due to.
  • the base station 100 transmits a PDCCH (S40), and the terminal 200 transmits a PUSCH using radio resources scheduled by the PDCCH (S41). .
  • the terminal 200 transmits the PUSCH by shifting in the time direction of four symbols because the unlicensed band is in the “Busy” state and is in the “Idle” state at the fourth symbol.
  • terminal 200 punctures CBG # 2 and CBG # 3 because available radio resources are reduced as compared with the case where PUSCH is transmitted from the first symbol.
  • FIG. 21 (A) shows an example in which puncturing is performed from the rear, but puncturing may be performed from the beginning (for example, from FIG. 4 (A) to FIG. 4 (D)), or from the center as in the downward direction. Puncture may be performed (for example, from FIG. 6A to FIG. 6D).
  • the terminal 200 performs the following processing.
  • the PDCCH reception processing unit 231 or the PDSCH reception processing unit 232 measures the received signal strength of the unlicensed band, and outputs the result to the control unit 234.
  • the control unit 234 determines the “Idle” state or the “Busy” state of the unlicensed band, similarly to the control unit 122 of the base station 100. In FIG. 21A, "Busy” is determined at the first and third symbols, and "Idle” is determined at the fourth symbol. Then, control section 234 receives DCI from PDCCH reception processing section 231 and outputs an uplink scheduling result to mapping section 237.
  • the control unit 234 outputs data to the PUSCH generation unit 235, and the PUSCH generation unit 235 outputs the received data to the mapping unit 237 as a PUSCH.
  • Mapping section 237 stores the PUSCH in the internal memory.
  • the control unit 234 shifts the symbols including the PUSCH in the time direction until the transmission start timing at which the state becomes the “Idle” state. Further, control section 234 determines which CBG to puncture according to the number of symbols to be shifted, similarly to control section 122 of base station 100. Control section 234 outputs a shift instruction and a puncture determination result to mapping section 237.
  • Mapping section 237 reads a non-punctured PUSCH from the internal memory according to the shift instruction and the determination result, and outputs the PUSCH to RF transmitting / receiving section 220. Mapping section 237 or RF transmitting / receiving section 220 transmits unpunctured data (in the example of FIG. 21A, data included in CBGs # 0 to # 2) to base station 100 using PUSCH. .
  • the base station 100 transmits the PDCCH to the terminal 200 for transmitting the untransmitted portion (S42).
  • the terminal 200 transmits the data of the untransmitted portion (CBG # 3 in the example of FIG. 21A) using the PUSCH according to the PDCCH (S43). For example, the terminal 200 performs the following processing.
  • control unit 234 receives the received signal strength from the PDCCH reception processing unit 231 or the PDSCH reception processing unit 232, and confirms the “Busy” state. At this time, the control unit 234 instructs the mapping unit 237 not to transmit the punctured CBG determined in S41.
  • control section 234 shifts the symbols including the PUSCH in the time direction until the transmission start timing, and outputs the result to mapping section 237. Further, control unit 234 instructs mapping unit 237 to transmit the punctured CBG.
  • the mapping unit 237 reads the punctured PUSCH (data included in CBG # 3 in the example of FIG.
  • the mapping unit 237 or the RF transmitting / receiving unit 220 transmits the data of the untransmitted portion (the data included in CBG # 3 in the example of FIG. 21A) to the base station 100 using the PUSCH.
  • FIG. 21B is an example of a case where transmission is performed using AUL.
  • the AUL is, for example, a transmission scheme in which the terminal 200 can transmit the PUSCH without waiting for an instruction by the PDCCH.
  • an AUL transmittable section is set by the RRC setting, and the terminal 200 can transmit the PUSCH in the AUL transmittable section without receiving the PDCCH.
  • the terminal 200 performs the carrier sense in the unlicensed band even in the AUL transmittable section, does not perform the transmission in the “Busy” state, and performs the transmission in the “Idle” state.
  • terminal 200 transmits CBG # 0 and CBG # 1 included in TB # 0 in the first AUL transmittable section, and shifts CBG # 2 and CBG # 2 by shifting in the time direction. Puncture with CBG # 3 (S50). Then, terminal 200 transmits punctured CBG # 2 and CBG # 3 to base station 100 at this timing in the next AUL transmittable section (S51).
  • the PUSCH includes UCI (Uplink (Control Information) for AUL.
  • the AUL UCI includes information on the transmitting TB.
  • information on TB # 0 is transmitted as AUL UCI.
  • terminal 200 can notify base station 100 which TB is being transmitted. For example, the terminal 200 performs the following processing.
  • the control unit 234 outputs information and data of the TB to be transmitted to the PUSCH generation unit 235 when the AUL transmission enabled section is reached according to the RRC setting.
  • PUSCH generating section 235 generates a PUSCH including the data and the UCI for AUL, and outputs the generated PUSCH to mapping section 237.
  • the mapping unit 237 stores the PUSCH in the internal memory.
  • the control unit 234 outputs the shift result and the determination result of the CBG to be punctured to the mapping unit 237, and the mapping unit 237 outputs the unpunctured PUSCH (FIG. In the example of FIG.
  • CBG # 0 and CBG # 1 are output to RF transmitting / receiving section 220. Further, when the next AUL transmission available section is reached, control section 234 outputs a shift result and a punctured CBG transmission instruction to mapping section 237.
  • the mapping unit 237 reads the data of the untransmitted portion (in the example of FIG. 21B, the data included in CBG # 2 and CBG # 3) from the internal memory according to the shift result and the transmission instruction, and Output to 220.
  • the terminal 200 can also transmit the TB by the same operation as the PDSCH.
  • FIGS. 22 (A) and 22 (B) are diagrams illustrating an operation example in a case where a PUCCH is added to the example of FIGS. 21 (A) and 21 (B).
  • the terminal 200 can transmit not only the PUSCH but also the PUCCH.
  • Each process is the same as the example in FIGS. 21A and 21B except that a PUCCH is added.
  • FIG. 23A is a diagram illustrating a hardware configuration example of the base station 100.
  • the base station 100 includes a processor 160, a main storage device 161, a network interface 162, an auxiliary storage device 163, a wireless device 164, and an antenna 140.
  • the processor 160 reads out the program stored in the main storage device 161 and loads it into the auxiliary storage device 163, and executes the loaded program to realize the function of the baseband signal processing unit 120.
  • the processor 160 corresponds to, for example, the baseband signal processing unit 120 according to the first embodiment.
  • the network interface 162 corresponds to, for example, the transmission line interface 110 in the first embodiment.
  • the wireless device 164 corresponds to, for example, the RF transmitting / receiving unit 130 in the first embodiment.
  • FIG. 28B is a diagram illustrating an example of a hardware configuration of the terminal 200.
  • the terminal 200 includes a processor 260, a main storage device 261, a screen display device 262, an auxiliary storage device 263, a wireless device 264, and an antenna 210.
  • the processor 260 reads the program stored in the main storage device 261, loads the program into the auxiliary storage device 263, and executes the loaded program to realize the functions of the baseband signal processing unit 230 and the application unit 240.
  • the processor 260 corresponds to, for example, the baseband signal processing unit 230 and the application unit 240 in the first embodiment.
  • the wireless device 264 corresponds to, for example, the RF transmitting / receiving unit 220 in the first embodiment.
  • the screen display device 262 displays an image by executing an application under the control of the processor 260, for example.
  • the processors 160 and 260 may be, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), an FPGA (Field-Programmable Gate Array), a DSP (Digital Processing Unit), or the like.
  • a CPU Central Processing Unit
  • MPU Micro Processing Unit
  • FPGA Field-Programmable Gate Array
  • DSP Digital Processing Unit
  • the base station 100 and the terminal 200 perform carrier sensing in units of two symbols, for example, and there are seven transmission opportunities in one slot. For example, when the base station 100 and the terminal 200 perform carrier sensing in units of one symbol, transmission opportunities exist 14 times in one slot.
  • base station 100 and terminal 200 shift, for example, in symbol period units.
  • the base station 100 or the terminal 200 may shift the first symbol by a period unit (or time unit) shorter than the symbol period.
  • the control unit 122 of the base station 100 or the control unit 234 of the terminal 200 for example, copies data or a signal included in the head symbol and shifts the copied data or signal to the head symbol when shifting the head symbol.
  • the control unit 122 of the base station 100 or the control unit 234 of the terminal 200 for example, copies data or a signal included in the head symbol and shifts the copied data or signal to the head symbol when shifting the head symbol.
  • the middle of the symbol period becomes possible.
  • Wireless communication system 100 Base station device (base station) 110: Transmission path interface 120: Baseband signal processing unit 121: Received signal processing unit 122: Control unit 123: PDCCH generation unit 124: PDSCH generation unit 125: Mapping unit 130: RF transmission / reception unit 140: Antenna 160: Processor 200 (200) -1,200-2): Terminal device (terminal) 210: antenna 220: RF transmitting / receiving unit 230: baseband signal processing unit 231: PDCCH reception processing unit 232: PDSCH reception processing unit 234: control unit 235: PUSCH generation unit 236: PUCCH generation unit 237: mapping unit 240: application unit 260 : Processor

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif de transmission qui peut communiquer sans fil avec un dispositif de réception en utilisant une première bande de fréquences qui ne nécessite pas une licence, le dispositif de transmission étant équipé : d'une unité de commande qui peut perforer, par groupe, des premières ou secondes données qui sont respectivement attribuées à un premier ou à un second canal partagé, lorsqu'un premier symbole qui comprend un premier canal de commande et un premier canal partagé, et un second symbole qui comprend un second canal partagé, sont décalés dans le sens du temps dans le cas où il n'était pas possible de vérifier un signal dans la première bande de fréquence pendant un traitement de détection de signal effectué sur la première bande de fréquences ; et d'une unité d'émission destinée à émettre un premier signal de commande et des premières données incluses dans un groupe non perforé au dispositif de réception en utilisant à la fois le premier canal de commande et le premier canal partagé ou à transmettre des secondes données incluses dans un groupe non perforé au dispositif de réception à l'aide du second canal partagé.
PCT/JP2018/029690 2018-08-07 2018-08-07 Dispositif de transmission, dispositif de réception, système de communication sans fil et procédé de communication WO2020031278A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016121672A1 (fr) * 2015-01-30 2016-08-04 京セラ株式会社 Terminal d'utilisateur, et station de base
WO2018079571A1 (fr) * 2016-10-28 2018-05-03 株式会社Ｎｔｔドコモ Terminal d'utilisateur, et procédé de communication sans fil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016121672A1 (fr) * 2015-01-30 2016-08-04 京セラ株式会社 Terminal d'utilisateur, et station de base
WO2018079571A1 (fr) * 2016-10-28 2018-05-03 株式会社Ｎｔｔドコモ Terminal d'utilisateur, et procédé de communication sans fil

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Title
HUAWEI ET AL.: "Support for multiple starting and ending positions in a subframe for UL on SCell with frame structure 3", 3GPP TSG RAN WG1 #89 RI-1707029, 6 May 2017 (2017-05-06), XP051261642, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WGl_RLl/TSGRl_89/Docs/Rl-1707029.zip> [retrieved on 20181015] *

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