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WO2017176044A1 - Procédé et dispositif destinés à la transmission de liaison montante à l'aide de sous-trame de liaison montante étendue - Google Patents

Procédé et dispositif destinés à la transmission de liaison montante à l'aide de sous-trame de liaison montante étendue Download PDF

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Publication number
WO2017176044A1
WO2017176044A1 PCT/KR2017/003716 KR2017003716W WO2017176044A1 WO 2017176044 A1 WO2017176044 A1 WO 2017176044A1 KR 2017003716 W KR2017003716 W KR 2017003716W WO 2017176044 A1 WO2017176044 A1 WO 2017176044A1
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WIPO (PCT)
Prior art keywords
subframe
index
uppts
extended
pusch
Prior art date
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PCT/KR2017/003716
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English (en)
Korean (ko)
Inventor
김철순
문성현
김지형
Original Assignee
한국전자통신연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from KR1020170043863A external-priority patent/KR102410282B1/ko
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to US16/084,400 priority Critical patent/US10834745B2/en
Publication of WO2017176044A1 publication Critical patent/WO2017176044A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • 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

Definitions

  • the present invention relates to an uplink transmission method and apparatus using an extended uplink subframe, and a communication method and apparatus using an extended uplink subframe.
  • the present invention relates to a method and apparatus for improving uplink transmission using a long term evolution (LTE) mixed subframe.
  • LTE long term evolution
  • MBB mobile broadband
  • URLLC ultra reliable and low latency communications
  • a time division duplexing (TDD) radio frame has a shorter uplink (UL) -downlink (DL) switching period, so that UL transmission and DL It is desirable for transmissions to be assigned more often. This has the effect of reducing a hybrid automatic repeat and request (HARQ) round trip time (RTT).
  • HARQ hybrid automatic repeat and request
  • An object of the present invention is to provide a TDD radio frame in which a switching period is allocated every subframe and a guard symbol is allocated every two subframes.
  • Another object of the present invention is to provide a method and apparatus for increasing a transmission amount of a long term evolution (LTE) uplink and reducing a transmission delay of the uplink.
  • LTE long term evolution
  • an uplink transmission method of a first communication node includes a case where an uplink pilot time slot (UpPTS) and a first uplink (UL) subframe of a special subframe are aggregated as an extended UL subframe.
  • UpPTS uplink pilot time slot
  • the predetermined number may be three.
  • the reference signal may be a demodulation (DM) -reference signal (RS).
  • DM demodulation
  • RS reference signal
  • Allocating a reference signal to the first UL subframe may include allocating the reference signal to each of a first slot and a second slot belonging to the first UL subframe.
  • the reference signal is allocated to the UpPTS and the first UL subframe based on the reference signal setting. It may further comprise a step.
  • the allocating of the reference signal to the UpPTS and the first UL subframe may include allocating the reference signal to a fourth time domain symbol at an end of time domain symbols belonging to the UpPTS.
  • the first UL subframe may include a first slot and a second slot next to the first slot.
  • the orthogonal cover code (OCC) or cyclic shift for the reference signal allocated to the UpPTS may be the same as the OCC or cyclic shift for the reference signal allocated to the second slot.
  • the same physical uplink shared channel (PUSCH) transmit power control (TPC) may be applied to the special subframe and the first UL subframe.
  • PUSCH physical uplink shared channel
  • TPC transmit power control
  • the uplink transmission method may further include receiving one UL grant for scheduling of the extended UL subframe from the second communication node.
  • the one UL grant may be based on the index of the first UL subframe.
  • the uplink transmission method when a physical hybrid automatic repeat and request indicator channel (PHICH) is received from a second downlink node in a downlink (DL) subframe having an index of n, a PUSCH (physical) for retransmission is received.
  • the method may further include transmitting an uplink shared channel) in the extended UL subframe having an index of (n + k).
  • PHICH physical hybrid automatic repeat and request indicator channel
  • the index of the first UL subframe may be (n + k), and the index of the special subframe may be (n + k-1).
  • the uplink transmission method may further include transmitting a physical uplink shared channel (PUSCH) to the second communication node in the extended UL subframe having an index (n-k); And receiving, from the second communication node, a physical hybrid automatic repeat and request indicator channel (PHICH) for the PUSCH in a downlink (DL) subframe having an index of n.
  • PUSCH physical uplink shared channel
  • PHICH physical hybrid automatic repeat and request indicator channel
  • the index of the first UL subframe may be (n-k), and the index of the special subframe may be (n-k-1).
  • an uplink (UL) transmission method of a first communication node transmits a UL data channel to a second communication node in an uplink pilot time slot (UpPTS) of a special subframe and an extended UL subframe in which a first UL subframe is aggregated. Doing; And receiving, from the second communication node, a response channel for the UL data channel in a first downlink (DL) subframe.
  • UpPTS uplink pilot time slot
  • the index of the extended UL subframe may be determined to be the same as the index of the first UL subframe.
  • the index of each of the special subframe and the first UL subframe may be (n-k-1), (n-k), and the index of the first DL subframe may be n.
  • the uplink transmission method may further include receiving an UL grant for the extended UL subframe in a second DL subframe from the second communication node.
  • the index of the second DL subframe may be determined based on the index of the first UL subframe.
  • the uplink transmission method may further include allocating a DM (demodulation) -RS (RS) to the UpPTS according to the number of time domain symbols belonging to the UpPTS.
  • DM demodulation
  • RS RS
  • Allocating a DM-RS to the UpPTS may include assigning the DM-RS to the first UL subframe among the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS is 3 or less. Assigning; And when the number of time domain symbols belonging to the UpPTS is four or more, allocating the DM-RS to the UpPTS and the first UL subframe.
  • a communication method of an evolved node B may be performed when an uplink pilot time slot (UpPTS) and a first uplink (UL) subframe of a special subframe are aggregated as an extended UL subframe. Determining a demodulation (DM) -reference signal (DM) configuration for the extended UL subframe based on the number of time domain symbols belonging to an UpPTS; And transmitting the DM-RS configuration to a user equipment (UE).
  • UpPTS uplink pilot time slot
  • UL uplink
  • UL subframe of a special subframe are aggregated as an extended UL subframe.
  • DM demodulation
  • DM demodulation-reference signal
  • the determining of the DM-RS configuration may include: assigning the DM-RS to the first UL subframe among the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS is less than or equal to a predetermined number.
  • the method may include determining the DM-RS configuration.
  • the determining of the DM-RS configuration may include: assigning the DM-RS to the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS exceeds a predetermined number. Determining an RS setting.
  • the communication method may further include transmitting a UL grant for the extended UL subframe to the UE in a first downlink (DL) subframe.
  • DL downlink
  • the index of the extended UL subframe may be determined to be the same as the index of the first UL subframe, and the index of the first DL subframe may be determined based on the index of the first UL subframe.
  • the communication method may include transmitting a physical hybrid automatic repeat and request indicator channel (PHICH) to the UE in a first downlink (DL) subframe; And receiving a physical uplink shared channel (PUSCH) for retransmission from the UE in the extended UL subframe.
  • PHICH physical hybrid automatic repeat and request indicator channel
  • PUSCH physical uplink shared channel
  • the index of the first DL subframe is n
  • the index of the extended UL subframe is (n + k)
  • the index of the first UL subframe is (n + k)
  • the index of the special subframe is (n + k-1).
  • the communication method includes receiving a physical uplink shared channel (PUSCH) from the UE in the extended UL subframe; And transmitting a physical hybrid automatic repeat and request indicator channel (PHICH) for the PUSCH to the UE in a first downlink (DL) subframe.
  • PUSCH physical uplink shared channel
  • PHICH physical hybrid automatic repeat and request indicator channel
  • the index of the extended UL subframe is (nk)
  • the index of the first DL subframe is n
  • the index of the first UL subframe is (nk)
  • the index of the special subframe is (nk-1). Can be).
  • uplink data is allocated to an extended mixed subframe, so that a larger amount of uplink data may be transmitted in a mixed subframe.
  • 1A and 1B are diagrams illustrating channel mapping for an MBB scenario.
  • FIG. 2 is a diagram illustrating a serving cell eNB and a UE according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an extended UL subframe in which UpPTS of a special subframe n and a normal UL subframe (n + 1) are aggregated through the method M100 according to an embodiment of the present invention.
  • 4A, 4B, and 4C are diagrams illustrating extended UL subframes having a DM-RS symbol according to an embodiment of the present invention.
  • 5A and 5B illustrate PUSCH rate matching for a case where an SRS symbol and a DM-RS symbol coincide with each other according to an embodiment of the present invention.
  • FIG. 6A is a diagram illustrating a single carrier scenario
  • FIG. 6B is a diagram illustrating a multicarrier scenario.
  • 7A and 7B are diagrams illustrating collision of a PUCCH.
  • FIG. 8 is a diagram illustrating a method of multiplexing a base HARQ-ACK to an sPUCCH or an sPUSCH according to an embodiment of the present invention.
  • 9A, 9B, and 9C are diagrams illustrating RE mapping of sPUXCH and bPUSCH according to an embodiment of the present invention.
  • 10A and 10B are diagrams illustrating resource blocks of PUCCH format 1, 1a, or 1b according to an embodiment of the present invention.
  • 11A and 11B are diagrams illustrating a resource block of LTE PUCCH format 3 according to an embodiment of the present invention.
  • 12A and 12B illustrate slots of the LTE PUCCH format 4 when a normal CP is used according to an embodiment of the present invention.
  • 13A and 13B illustrate slots of an LTE PUCCH format 5 when a normal CP is used according to an embodiment of the present invention.
  • 14A and 14B illustrate puncturing of short PUCCH according to an embodiment of the present invention.
  • FIG. 15 illustrates a case in which three UL control subslots are configured in a base PUCCH having seven UL symbols according to an embodiment of the present invention.
  • 16A and 16B illustrate a case in which a base PUCCH is punctured through one short PUCCH according to an embodiment of the present invention.
  • 17A and 17B illustrate a case in which a base PUCCH is punctured through two or more short PUCCHs according to an embodiment of the present invention.
  • 18A and 18B are diagrams illustrating a RE mapping method of a sequence (sequence) according to an embodiment of the present invention.
  • FIG. 19 illustrates a UL control subslot structure using a PUSCH PRB according to an embodiment of the present invention.
  • FIG. 20 is a diagram of a computing device, in accordance with an embodiment of the invention.
  • a component when referred to as being 'connected' or 'connected' to another component, the component may be directly connected to or connected to the other component, but in between It will be understood that may exist.
  • a component when referred to as 'directly connected' or 'directly connected' to another component, it should be understood that there is no other component in between.
  • the term 'comprises' or 'having' is only intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more. It is to be understood that it does not exclude in advance the possibility of the presence or addition of other features, numbers, steps, actions, components, parts or combinations thereof.
  • 'and / or' includes any combination of the plurality of listed items or any of the plurality of listed items.
  • 'A or B' may include 'A', 'B', or 'both A and B'.
  • user equipment includes a terminal, a mobile terminal, a mobile station, an advanced mobile station, and a high reliability mobile station.
  • a subscriber station, a portable subscriber station, an access terminal, and the like and may include a terminal, a mobile terminal, a mobile station, an advanced mobile station, a high reliability mobile station, It may also include all or part of the functions of the subscriber station, portable subscriber station, access terminal and the like.
  • an evolved node B includes a node B (NB), a gNB, a base station (BS), an advanced base station, and a high reliability base station (high).
  • reliability base station access point, radio access station, base transceiver station, mobile multihop relay (MSR) -BS, relay station serving as base station, base station A high reliability relay station, a repeater, a macro base station, a small base station, and the like, which may serve as Node B, gNB, base station, advanced base station, HR-BS, access point, radio access station, It may include all or part of the functions of a transmission / reception base station, an MMR-BS, a repeater, a high reliability repeater, a repeater, a macro base station, a small base station, and the like.
  • 1A and 1B are diagrams illustrating channel mapping for an MBB scenario.
  • FIG. 1A illustrates downlink channel mapping
  • FIG. 1B illustrates uplink channel mapping
  • paging control channel PCCH
  • BCCH broadcast control channel
  • CCCH common control channel
  • DCCH dedicated control channel
  • DTCH dedicated traffic channel
  • PCH paging channel
  • BCH broadcast channel
  • BCH shared channel
  • DL-SCH transport channels
  • PDCCH physical downlink control channel
  • PBCH physical broadcast channel
  • PDSCH physical downlink shared channel
  • PHICH physical HARQ indicator channel
  • the PCCH which is a logical channel
  • PCH which is a transport channel
  • PDSCH which is a physical channel
  • BCCH which is a logical channel
  • BCH which is a logical channel
  • PBCH which is a physical channel
  • the CCCH, DCCH, or DTCH which is a logical channel, is mapped to DL-SCH, which is a transport channel
  • the DL-SCH is mapped to PDSCH, which is a physical channel.
  • CCCH and DCCH are logical channels
  • UL-SCH and random access channel (RACH) are transport channels
  • PUSCH and PRACH physical uplink shared channel
  • the logical channel CCCH or DCCH is mapped to the transport channel UL-SCH, and the UL-SCH is mapped to the physical channel PUSCH.
  • RACH which is a transport channel
  • PRACH which is a physical channel.
  • FIG. 2 is a diagram illustrating a serving cell eNB and a UE according to an embodiment of the present invention.
  • Serving cell eNB refers to an eNB serving (or providing) a serving cell. Specifically, the serving cell eNB is controlled by the eNB controller. Each of the serving cell eNB and the UE includes a physical layer, its upper layer, a transmitting unit, a receiving unit, and an antenna.
  • Signals transmitted by the serving cell are DL HARQ- for decoding scheduling (DL), DL data, DL reference signal (RS), synchronization signal, and UL data decoding for DL data and UL data.
  • DL decoding scheduling
  • DL data DL data
  • RS DL reference signal
  • UL data decoding for DL data and UL data.
  • ACK acknowledgement / negative acknowledgment
  • the UE receives the SA, transmits UL data and UL RS, performs an RACH procedure, and performs an operation such as UL HARQ-ACK for DL data decoding.
  • a method of reducing the time required for DL assignment, DL data burst, and UL HARQ may be considered.
  • LTE TDD and LTE frequency division duplex (FDD) allocate DL allocation (e.g. PDCCH) and DL data burst (e.g. PDSCH) in the same subframe, from which the UL after k subframes Perform HARQ.
  • DL allocation e.g. PDCCH
  • DL data burst e.g. PDSCH
  • the value of k is a value defined in the LTE standard
  • k for LTE FDD is 4
  • k for LTE TDD has a different value according to UL-DL subframe configuration.
  • the UE may transmit a physical (HY) RS and a PRACH preamble, but the serving cell (or serving cell eNB) may use the UpPTS.
  • the PUCCH and the PUSCH are not allocated in the region.
  • the time domain symbol is an orthogonal frequency division multiplexing (OFDM) symbol or a single carrier (SC) -frequency division multiple access (FDMA) symbol
  • OFDM orthogonal frequency division multiplexing
  • SC single carrier
  • FDMA frequency division multiple access
  • PUSCH may be allocated in one, two, three, four, five, or six time domain symbols. Therefore, in UpPTS, the serving cell (or serving cell eNB) can allocate the PUSCH.
  • the special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP), and an UpPTS.
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS UpPTS
  • the serving cell In case of UL-DL subframe configuration 0 for LTE TDD, the serving cell (or serving cell eNB) is the UL for UL subframes (n + 6) and (n + 7) in special subframe n.
  • a bitmap is allocated to a downlink control information (DCI) format for this purpose, and a UL subframe index to which a UL grant is applied is designated.
  • DCI downlink control information
  • the UL grant is applied to the UL subframe (n + 6)
  • the bitmap is '01'
  • the UL grant is applied to the UL subframe (n + 7)
  • the bit is If the map is '11', the UL grant is applied to UL subframes (n + 6) and (n + 7).
  • UL resource allocation is commonly applied to subframes (n + 6) and (n + 7), so that scheduling flexibility and overhead reduction are adjusted.
  • the UE may obtain a block error rate (BLER) differently.
  • the serving cell or serving cell eNB must allocate a large number of RBs to the UE, which affects UL coverage.
  • FIG. 3 is a diagram illustrating an extended UL subframe in which UpPTS of a special subframe n and a normal UL subframe (n + 1) are aggregated through the method M100 according to an embodiment of the present invention.
  • FIG. 3 illustrates a resource grid when UpPTS is defined in two time domain symbols.
  • the horizontal axis represents time domain symbols and the vertical axis represents subcarriers.
  • one DM-RS symbol (e.g., DM-RS) per slot, such that the DM (demodulation) -RS is located in the middle of the slot (e.g., in the case of normal CP, time domain symbol index 3) Time domain symbols) are allocated, and orthogonal cover code (OCC) 2 is applied between two DM-RS symbols.
  • the DM-RS symbol index follows the time domain symbol index 3 according to a value defined in the Rel-13 technical specification (TS).
  • 4A, 4B, and 4C are diagrams illustrating extended UL subframes having a DM-RS symbol according to an embodiment of the present invention.
  • FIG. 4A illustrates an extended UL subframe when UpPTS occupies two time domain symbols
  • FIG. 4B illustrates an extended UL subframe when UpPTS occupies four time domain symbols.
  • An extended UL subframe is illustrated when UpPTS occupies six time domain symbols.
  • a communication node may receive a DM-RS configuration for UpPTS from another communication node (eg, eNB).
  • the communication node eg, eNB
  • the communication node eg, eNB
  • the communication node may allocate the DM-RS only to the normal UL subframe among the UpPTS and the normal UL subframe based on the DM-RS configuration. have.
  • the communication node may allocate the DM-RS to the UpPTS and the normal UL subframe based on the DM-RS configuration. That is, the communication node (eg, UE) may allocate the DM-RS to the UpPTS according to the number of time domain symbols belonging to the UpPTS.
  • a separate PUSCH DM-RS for UpPTS may not be allocated, and each of the normal UL subframes may be allocated.
  • One DM-RS symbol may be allocated to each UL slot.
  • UpPTS occupies more than half of UL slots (eg, four or more time domain symbols) in an extended UL subframe
  • one DM-RS symbol may be allocated for UpPTS, and
  • One DM-RS symbol may be allocated to each UL slot.
  • the communication node eg, UE
  • the extended UL subframe may have the shape of FIG. 4B or 4C.
  • 4B and 4C illustrate a case in which an extended UL subframe has three DM-RS symbols.
  • the OCC of the DM-RS symbol allocated to the UpPTS region uses the OCC of the DM-RS symbol allocated to the second UL slot (eg, slot 1) region of the normal UL subframe.
  • the cyclic shift of the DM-RS symbol allocated to the UpPTS region uses a cyclic shift of the DM-RS symbol allocated to the second UL slot (eg, slot 1) region of the normal UL subframe. That is, the OCC or cyclic shift for the DM-RS allocated to UpPTS may be the same as the OCC or cyclic shift for DM-RS allocated to slot 1.
  • PUSCH rate matching may be defined to avoid collisions when a sounding reference signal (SRS) is configured.
  • SRS sounding reference signal
  • the same PUSCH transmit power control may be applied to the special subframe and the UL subframe.
  • the point in time at which the serving cell (or serving cell eNB) transmits a TPC command for PUSCH transmission in the extended UL subframe to the UE is set to the UL subframe index, not the index of the special subframe.
  • the range to which the TPC command received by the UE from the serving cell (or serving cell eNB) is applied is when the UE transmits the PUSCH only in the UL subframe without transmitting the PUSCH in the special subframe and the PUSCH in the extended UL subframe. It may include all cases of transmitting.
  • a communication node may receive one UL grant for scheduling of an extended UL subframe from a communication node (eg, an eNB).
  • a communication node eg, an eNB
  • a UL grant is transmitted based on a normal UL subframe index. That is, a subframe in which a UL grant for a PUSCH to be transmitted in an extended UL subframe may be transmitted may be based on a normal UL subframe index. For example, if the extended UL subframe is configured with subframe indexes ⁇ 1, 2 ⁇ , the UL grant is transmitted to the UE, as the PUSCH is transmitted at subframe index 2. For another example, when the extended UL subframe is configured with subframe indexes ⁇ 6, 7 ⁇ , the UL grant is transmitted to the UE, as the PUSCH is transmitted at subframe index 7.
  • the time relationship between the UL grant and the PUSCH of the extended UL subframe follows the relationship defined in the existing LTE standard (eg, Rel-13 TS 36.213). If the PDCCH is transmitted at DL subframe index n, the PUSCH for it is transmitted at UL subframe index (n + k). Here, the value of k is defined in Rel-13 TS 36.213 table 8-2 or section 8. That is, the index of the DL subframe in which the UL grant for the extended UL subframe is transmitted may be determined based on the index of the UL subframe included in the extended UL subframe.
  • the serving cell When the UE retransmits the PUSCH transmitted in the extended UL subframe, or when the subframe in which the PUSCH is retransmitted is a normal UL subframe, the serving cell (or serving cell eNB) is applied to the MCS to be applied to the PUSCH to be retransmitted through the UL grant.
  • the offset may be separately included in the UL grant and signaled (adaptive retransmission).
  • the retransmission timing in the extended UL subframe may be determined based on the index of the normal UL subframe. This has the advantage that a new UL grant does not have to be transmitted while backward compatibility of LTE is observed.
  • the PHICH subframe and the PUSCH subframe which performs retransmission thereof may be determined as defined in the existing LTE standard (eg, Rel-13 TS 36.213).
  • the PHICH is transmitted in DL subframe n and the PUSCH for it is transmitted in UL subframe (n + k).
  • the value of k is defined in Rel-13 TS 36.213 table 8-2 or section 8.
  • the PHICH is transmitted in DL subframe index 3
  • the PUSCH performing retransmission for it is transmitted in extended UL subframe index 7 (eg, the extended UL subframe consists of subframe index ⁇ 6, 7 ⁇ ).
  • the PUSCH performing retransmission for it is transmitted in extended UL subframe index 12 (eg, the extended UL subframe consists of subframe index ⁇ 1, 2 ⁇ ).
  • (PHICH, second PUSCH) may be expressed as (3, 7) or (8, 12)
  • (PHICH, first PUSCH) is expressed as (3, 6) or (8, 11). May be
  • a communication node eg, a UE
  • a communication node eg, an eNB
  • a PUSCH for retransmission is performed in the extended UL subframe index (n + k).
  • eNB the indices of the special subframe and the normal UL subframe included in the extended UL subframe are (n + k-1) and (n + k).
  • Rel-13 TS 36.213 table 8-2 is applied. If the PHICH is transmitted at DL subframe index 0, the PUSCH performing retransmission for it is transmitted at UL subframe index 4. If the PHICH is transmitted at DL subframe index 8, the PUSCH performing retransmission for it is transmitted at UL subframe index 12. If the PHICH is transmitted at DL subframe index 9, the PUSCH performing retransmission for it is transmitted at UL subframe index 13. To simplify this, (PHICH, PUSCH) may be expressed as (0, 4), (8, 12), or (9, 13).
  • the PHICH is transmitted in DL subframe index 8
  • the PUSCH performing retransmission for it is transmitted in extended UL subframe index 2 (eg, the extended UL subframe consists of subframe index ⁇ 1, 2 ⁇ ).
  • extended UL subframe index 2 eg, the extended UL subframe consists of subframe index ⁇ 1, 2 ⁇ .
  • (PHICH, second PUSCH) may be represented as (8, 12)
  • (PHICH, first PUSCH) may be represented as (8, 11).
  • Rel-13 TS 36.213 table 8-2 is applied. If the PHICH is transmitted at DL subframe index 0, the PUSCH performing retransmission for it is transmitted at UL subframe index 7. If the PHICH is transmitted in DL subframe index 1, the PUSCH performing retransmission for it is transmitted in UL subframe index 8. If the PHICH is transmitted in DL subframe index 5, the PUSCH performing retransmission for it is transmitted in UL subframe index 12. If the PHICH is transmitted in DL subframe index 6, the PUSCH performing retransmission for it is transmitted in UL subframe index 13.
  • PHICH is transmitted at DL subframe index 9
  • the PUSCH performing retransmission for it is transmitted at UL subframe index 14.
  • (PHICH, PUSCH) may be expressed as (0, 7), (1, 8), (5, 12), (6, 13), or (9, 14).
  • the PHICH is transmitted at DL subframe index 0
  • the PUSCH performing retransmission for it is transmitted at an extended UL subframe index 7 (eg, the extended UL subframe consists of subframe index ⁇ 6, 7 ⁇ ).
  • the PUSCH performing retransmission for it is transmitted in extended UL subframe index 12 (eg, the extended UL subframe consists of subframe index ⁇ 1, 2 ⁇ ).
  • (PHICH, second PUSCH) may be represented as (0, 7) or (5, 12)
  • (PHICH, first PUSCH) is represented as (0, 6) or (5, 11). May be
  • the above-described scheme may be applied even when the TDD UL / DL subframe configuration is different from the above-described example.
  • a method of separately defining a UL grant for only a special subframe n (hereinafter, 'method M200') will be described.
  • the method M200 does not apply to an extended UL subframe or a normal UL subframe, but only to UpPTS belonging to a special subframe n. If method M200 is used, there are two UL grants for PUSCH to be transmitted in an extended UL subframe. In this case, the UE should receive both the UL grant for the special subframe and the UL grant for the normal UL subframe.
  • the following method M210 and method M220 may be used.
  • Method M210 for method M200 is a method in which a UL grant for allocating a PUSCH in a special subframe includes both an RB assignment and an MCS.
  • the method M210 may be applied not only when a PUSCH is transmitted in an extended UL subframe but also when a PUSCH is transmitted using only a special subframe.
  • Method M220 for method M200 is a UL grant for allocating a PUSCH in a special subframe and a UL grant for allocating a PUSCH in a normal UL subframe, wherein the RB assignments are unified with each other while the MCS is separately This is how it is defined.
  • only one UL grant may include RB allocation information.
  • RB allocation information may be included only in the UL grant scheduling the normal UL subframe, and RB allocation information may not be included in the UL grant scheduling the special subframe.
  • the UE may apply RB allocation information in the same way to the special subframe and the normal UL subframe.
  • Method M221 for method M220 is a method in which a UL grant includes an MCS offset. If only the difference between the MCS1 to be applied to the PUSCH transmitted in the special subframe and the MCS2 to be applied to the PUSCH transmitted in the normal UL subframe (eg, MCS2-MCS1) is included in the UL grant, the number of bits for encoding of the MCS may be reduced. have. For example, in order to indicate to the UE MCS1 to be applied to the PUSCH to be transmitted in the special subframe, the UL grant for the PUSCH to be transmitted in the special subframe may include (MCS2-MCS1).
  • the UE may derive MCS1 by further receiving the UL grant for the PUSCH to be transmitted in the normal UL subframe and then decoding the MCS2.
  • the UL grant for the PUSCH to be transmitted in the special subframe includes MCS1
  • the UL grant for the PUSCH to be transmitted in the normal UL subframe is (MCS2-MCS1).
  • the UE can obtain MCS1 and MCS2 at an earlier time.
  • the MCS offset may include both negative and positive numbers.
  • the MCS offset contains only positive numbers when the TBS increases above the reference TBS, and the MCS offset contains only negative numbers when the TBS decreases below the reference TBS.
  • the MCS applied to the PUSCH to be transmitted in the UpPTS is determined for each TB (MCS + MCS offset).
  • the method of receiving the MCS and the MCS offset by the UE follows the above-described method.
  • Method M230 for method M200 performs adaptive retransmission.
  • the serving cell (or serving cell eNB) transmits the PHICH in subframe n, and in case of negative acknowledgment (NACK), the UE may retransmit the PUSCH in subframe (n + g).
  • NACK negative acknowledgment
  • the value of g may be set to the UE according to the standard or according to higher layer signaling.
  • the PHICH is transmitted in the DL subframe or in the DwPTS of the special subframe, and is transmitted in the subframe (n + k).
  • the value of k is determined to be a predetermined value defined in TS. If the UE does not receive the UL grant of the TB within the time window, the UE considers the decoding for that TB successful in the serving cell (or serving cell eNB). In such a case, the UE may flush the TB from the soft buffer.
  • the UL grant must include at least an index of the HARQ process.
  • the UE transmits a PUSCH and receives a HARQ-ACK for it from the serving cell (or serving cell eNB) through the PHICH.
  • the transmission time of the PHICH may be calculated based on the normal UL subframe index (eg, 2 or 7) on which the PUSCH is transmitted.
  • the subframe index is 10 or more, 1 is added to the radio frame index, and 10 is subtracted from the value of the subframe index.
  • the subframe index for the extended UL subframe is 2
  • the subframe index for the extended UL subframe is 7. That is, the extended UL subframe index may be determined to be the same as the index of the UL subframe included in the extended UL subframe.
  • the subframe index for the extended UL subframe is 2.
  • the PUSCH subframe and the PHICH subframe transmitted therefor may be determined, as defined in the existing LTE standard (eg, Rel-13 TS 36.213). PUSCH is transmitted in UL subframe (n ⁇ l) and PHICH for it is transmitted in DL subframe n.
  • the value of l is defined in Rel-13 TS 36.213 table 8.3-1 and section 8.
  • the serving cell (or serving cell eNB) sends a PHICH thereto for the DL subframe. Transmit at frame index 8. If the PUSCH is transmitted at UL subframe index 7, the PHICH for it is transmitted at DL subframe index 13. To simplify this, (PUSCH, PHICH) may be expressed as (2, 8) or (7, 13).
  • a PUSCH is transmitted at extended UL subframe index 2 (eg, an extended UL subframe consists of subframe index ⁇ 1, 2 ⁇ ), the PHICH for it is transmitted at DL subframe index 8.
  • extended UL subframe index 7 eg, the extended UL subframe consists of subframe index ⁇ 6, 7 ⁇
  • the PHICH for it is transmitted in DL subframe index 13.
  • second PUSCH, PHICH may be represented as (2, 8) or (7, 13)
  • (first PUSCH, PHICH) is represented as (1, 8) or (6, 13). May be
  • a communication node may transmit a UL data channel (e.g., PUSCH) to a communication node (e.g., eNB) at an extended UL subframe index (nl), and UL data from the communication node (e.g., eNB).
  • a response channel eg PHICH
  • the indices of the special subframe and the normal UL subframe included in the extended UL subframe are (n ⁇ l ⁇ 1) and (n ⁇ l), respectively.
  • the serving cell (or serving cell eNB) for the UE has a DL subframe index 8 Transfer from If the PUSCH is transmitted at UL subframe index 3, the PHICH for it is transmitted at DL subframe index 9. If the PUSCH is transmitted at UL subframe index 4, the PHICH for it is transmitted at DL subframe index 10.
  • (PUSCH, PHICH) may be expressed as (2, 8), (3, 9), or (4, 10).
  • a PUSCH is transmitted at extended UL subframe index 2 (eg, an extended UL subframe consists of subframe index ⁇ 1, 2 ⁇ )
  • the PHICH for it is transmitted at DL subframe index 8.
  • (second PUSCH, PHICH) may be represented as (2, 8)
  • (first PUSCH, PHICH) may be represented as (1, 8).
  • the above-described scheme may be applied even when the TDD UL / DL subframe configuration is different from the above-described example.
  • a rate matching method (hereinafter 'method M300') for the PUSCH will be described.
  • UpPTS may be interfered by a PRACH preamble or SRS.
  • the LTE system defines a shortened PUSCH by previously defining an SRS symbol (eg, a time domain symbol for the SRS), and transmits the shortened PUSCH in an UL subframe.
  • the serving cell may not allocate a PUSCH to the RB through which the PRACH preamble format 4 is transmitted.
  • Method M310 for method M300 is a method of setting a PUSCH DM-RS symbol and an SRS symbol such that a PUSCH DM-RS symbol and an SRS symbol match.
  • the method M310 increases the interference between the PUSCH DM-RS and the SRS, but can instead reduce the interference between the data RE and the SRS of the PUSCH. Since the SRS and the PUSCH DM-RS interfere with each other, the serving cell (or serving cell eNB) estimates UL channel state information (CSI) in consideration of this.
  • the serving cell (or serving cell eNB) may utilize this for UL multi user (MU) -multiple input multiple output (MIMO) pairing, UL link adaptation, and the like.
  • MU multi user
  • MIMO multiple input multiple output
  • Method M320 for method M300 is a method of setting a PUSCH DM-RS symbol and an SRS symbol so that the PUSCH DM-RS symbol and the SRS symbol are different from each other.
  • the PUSCH assigned to UpPTS may interfere with the SRS in any time domain symbol. Therefore, the serving cell (or serving cell eNB) can control the interference between the PUSCH and the SRS by localizing the SRS symbols of the UEs to specific time domain symbols. For example, to increase the decoding probability of the PUSCH, PUSCH rate matching without allocating the PUSCH may be performed in the SRS symbol.
  • the method M320 may be applied to UpPTS where there are not many time domain symbols including the PUSCH, and the method M320 may be applied to an extended UL subframe.
  • UpPTS is composed of two time domain symbols
  • an SRS symbol is separately allocated within a special subframe, one time domain symbol for transmitting a PUSCH remains. Therefore, when the SRS symbol is separately allocated, the SRS symbol may be separately allocated in the normal UL subframe instead of the special subframe.
  • Method M330 for method M300 is a method of performing PUSCH rate matching. Since the method M320 does not allocate the PUSCH in the SRS symbol, it reduces the transmission amount of the PUSCH. The method M330 may reduce the transmission amount of the PUSCH to a relatively small amount. Accordingly, the rate matching of the PUSCH in consideration of the SRS comb may result, thereby increasing the throughput of the PUSCH.
  • the serving cell (or serving cell eNB) may align SRS resources and perform PUSCH rate matching so that aligned SRS resources (eg, sector aligned SRS resource element) are avoided.
  • the serving cell When the serving cell (or serving cell eNB) aligns SRS resources set to different UEs, the SRS resources occur at the same time symbol and have the same subcarrier shift (or comb). UEs may be instructed through higher layer signaling. Accordingly, the serving cell (or serving cell eNB) may use a successive cancellation receiver to distinguish the already aligned SRS resources through cyclic shifts rather than through combs.
  • 5A and 5B illustrate PUSCH rate matching for a case where an SRS symbol and a DM-RS symbol coincide with each other according to an embodiment of the present invention.
  • FIG. 5A illustrates a case in which the SRS symbol and the DM-RS symbol coincide with the method M310
  • FIG. 5B illustrates a case where 'sector aligned SRS comb' is used by the method M330.
  • the serving cell or serving cell eNB
  • FIG. 5A a method of configuring a UE to have an SRS symbol index and a DM-RS symbol index is illustrated.
  • the serving cell (or serving cell eNB) allocates an SRS symbol having four transmission combs in one time domain symbol, and one number (eg, 0, 1, 2, 3) is a subcarrier shift (subcarrier). shift).
  • radio resource control RRC is set such that the PUSCH DM-RS symbol and the SRS symbol are the same.
  • the DM-RS symbol index is set to 3 (eg, in case of normal CP)
  • the SRS symbol index may also be set to 3.
  • the method illustrated in FIG. 5A does not need to separately match PUSCH for SRS.
  • FIG. 5B a method of setting transmission combs to match in an SRS symbol is illustrated. For example, if four transmission combs are not set and two of them are set, the RE corresponding to the other two transmission combs may be allocated to the PUSCH. In this case, the UE allocates a PUSCH for the corresponding transmission comb and does not allocate data for the remaining transmission combs. Therefore, the method illustrated in FIG. 5B should perform PUSCH rate matching for SRS. In the method illustrated in FIG. 5B, UL data may also be allocated in an SRS symbol, thereby increasing UL transmission or throughput.
  • the eNB transmits signals on one or a plurality of carriers, and the UE may perform communication with the eNB in a state where reception of one or a plurality of carriers is configured.
  • a radio frame for performing wireless communication is composed of a plurality of subframes, and one subframe is composed of a plurality of multi-carrier symbols. Numerology applied to multi-carrier modulation is parameterized so that multiple multi-carrier symbols can coexist in one server frame.
  • a transmission time interval means a unit of a data packet capable of dynamic scheduling.
  • enhanced MBB and URLLC may be considered.
  • eMBB is a service that seeks high throughput or throughput
  • URLLC is a service that seeks low latency, so one system needs a short definition of TTI to support eMBB and URLLC. Do.
  • FIG. 6A is a diagram illustrating a single carrier scenario
  • FIG. 6B is a diagram illustrating a multicarrier scenario.
  • a wireless communication system may support multiple TTIs in a single carrier operation.
  • the wireless communication system can vary the length of the TTI by using a plurality of parameters of the multi-carrier symbol.
  • a wireless communication system may use several subcarrier spacings when considering orthogonal frequency division multiplexing (OFDM) modulation.
  • OFDM orthogonal frequency division multiplexing
  • the first TTI may be composed of N 1 OFDM symbols (each OFDM symbol has a subcarrier spacing of 15 kHz), and the second TTI is N 2 OFDM symbols (each OFDM symbol has a subcarrier of 60 kHz). Spaced apart).
  • the length of the first TTI and the length of the second TTI may be different from each other.
  • new radio NR supports mixed numerology.
  • the wireless communication system uses a multicarrier symbol having one parameter and can configure one TTI by adjusting the number of time domain symbols belonging to the TTI.
  • the first TTI may consist of N 1 OFDM symbols (each OFDM symbol has a subcarrier spacing of 15 kHz), and the second TTI is N 2. OFDM symbols (each OFDM symbol has a subcarrier spacing of 15 kHz).
  • the length of the first TTI and the length of the second TTI are different from each other. This is supported by NR and LTE Advanced pro.
  • the wireless communication system may use the length of the TTI through a multi-carrier operation.
  • a wireless communication system can support LTE and NR through dual connectivity.
  • the wireless communication system may deploy LTE in a frequency range within 6 GHz and deploy NR in a frequency range around 30 GHz.
  • LTE uses an OFDM symbol having a subcarrier spacing of 15 kHz according to the specification, but NR may use an OFDM symbol having a subcarrier spacing of 60 kHz.
  • LTE operates based on the first TTI and NR operates based on the second TTI.
  • the TTI setting method is various, and the advantages of each TTI setting method are as follows.
  • the wireless communication system may configure one DL TTI and one UL TTI.
  • a system in which the DL TTI and the UL TTI are the same hereinafter, 'System1a'
  • 'System1b' a system having a longer UL TTI based on the DL TTI
  • 'System1c' a system having a shorter UL TTI based on the DL TTI.
  • System 1b can achieve UL coverage enhancement by increasing the UL TTI.
  • System 1c can reduce UL latency by reducing UL TTI.
  • a wireless communication system can set one or more DL TTIs and one or more UL TTIs.
  • a system for setting one DL TTI and two UL TTIs hereinafter 'System2a'
  • a system for setting two DL TTIs and one UL TTI hereinafter, 'System2b'
  • a system for setting two DL TTIs and two UL TTIs hereinafter,' system 2c '
  • System 2a may use a short UL TTI to reduce UL latency and may use a long UL TTI to secure UL coverage.
  • System 2b can conversely use short DL TTIs to reduce DL latency and long DL TTIs to secure DL coverage.
  • System 2c can secure both latency and coverage in UL and DL.
  • TTI time division multiple access
  • TTI time division multiple access
  • (DL, UL) (sTTI & bTTI, sTTI) 11.
  • (DL, UL) (bTTI, sTTI & bTTI) 12.
  • (DL, UL) (sTTI, sTTI & bTTI) 13.
  • (DL, UL) (sTTI, bTTI) & (bTTI, sTTI) 14.
  • (DL, UL) (sTTI, sTTI) & (bTTI, bTTI) 15.
  • (DL, UL) (15 & 60, 15) 16.
  • (DL, UL) (15, 15 & 60) 17.
  • (DL, UL) (15, 15 & 60) 18.
  • (DL, UL) (60, 15 & 60) 19.
  • (DL, UL) (60, 15) & (15, 60) 20.
  • bTTI means relatively long TTI
  • sTTI means relatively short TTI.
  • the subcarrier spacing of 15 kHz and the subcarrier spacing of 60 kHz are compared with each other in the case of different numerology, but this is only an example, and in Table 1, 15 kHz and 60 kHz may be replaced by any two numbers.
  • the TTI composed of 15 kHz OFDM symbols is relatively long and the TTI composed of 60 kHz OFDM symbols is relatively short.
  • a 30 kHz subcarrier spacing may be used to construct a relatively long TTI
  • a 60 kHz subcarrier spacing may be used to form a relatively short TTI.
  • case 11 and case 17 a collision expected by the UE occurs. Specifically, since the period of DL control is determined based on the bTTI and the UL data is granted based on the sTTI, the UE can anticipate a collision.
  • the UL data may be transmitted based on the sTTI while the UE transmits the UL data based on the bTTI.
  • the transmission overlap that the UE does not anticipate in advance is independent of the number of multicarrier symbols and the used numerology.
  • the specification may be implemented by the UE for implementing complexity (e.g., receiving two or more DL controls and handling overlap of data transmissions). Implementation complexity) can be used.
  • a system operating two UL scheduling grants in a DL control channel may have to send another UL data while transmitting UL data. Cases related to this can be summarized as shown in Table 1. For example, when bPUSCH and one or more sPUSCHs are transmitted (case a1), when bPUSCH and one or more sPUCCHs are transmitted (case a2), when bPUCCH and one or more sPUSCHs are transmitted (case a3), and bPUCCH and one There may be a case of transmitting more than sPUCCH (case a4).
  • PUXCH means PUCCH or PUSCH, and sPUXCH (short PUXCH) is shorter than bPUXCH (base PUXCH).
  • 7A and 7B are diagrams illustrating collision of a PUCCH.
  • FIG. 7A illustrates a collision between bPUCCH and sPUCCH in FDD
  • FIG. 7B illustrates a collision between bPUCCH and sPUCCH in TDD.
  • the UE transmits uplink data for base subframe 4 indicated by base serving subframe 0 by the serving cell (or serving cell eNB) based on bTTI.
  • the UE transmits uplink data for short subframes 5 and 7 indicated by the serving cell (or serving cell eNB) in short subframes 1 and 3 based on the sTTI.
  • uplink data transmission of the UE overlaps with each other in the base subframe 4 and the short subframes 5 and 7, a standard for avoiding this is necessary.
  • the system operates in DL before GP and in UL after GP.
  • Method P300 is a method in which the UE feeds back sPUCCH or sPUSCH with the base HARQ-ACK.
  • the method P400 is a method in which the UE feeds back with the sPUCCH without delaying the bPUCCH. Since the sPUCCH has a latency requirement, the UE should be able to transmit the sPUCCH preferentially, but the indication of the transmission of the sPUCCH after the time when the UE encodes uplink control information (UCI) for the bPUCCH May occur. As such, the method P400 may be used to consider the case where the UE does not reflect UCI for sPUCCH while performing bPUCCH encoding and encodes only UCI for bPUCCH.
  • UCI uplink control information
  • the method P300 configures the UE to multiplex bPUCCH on the basis of the sPUCCH. Specifically, when the UE needs to transmit the sPUCCH (or sPUSCH) based on the uplink sTTI, the base HARQ-ACK may be multiplexed on the sPUCCH (or sPUSCH).
  • Method P310 for method P300 is a resource selection method with respect to base HARQ-ACK bits.
  • the serving cell may configure a resource set to the UE through higher layer signaling.
  • the resource set includes a plurality of resources, and the UE may dynamically select one of the resources included in the resource set to transmit uplink data or uplink control on the selected resource.
  • the selection metric of the UE may be based on the base HARQ-ACK bit.
  • the serving cell (or serving cell eNB) can estimate which resource the UE has selected and detect the base HARQ-ACK.
  • the range defined by the resource includes at least a sequence index, a cyclic shift (CS), and an OCC, and includes a time resource and a frequency resource.
  • the time resource may represent a transmission timing in a subframe or slot unit and may be represented by a symbol index.
  • the frequency resource may be expressed in subband units or in RB units.
  • the range of resource configuration includes DM-RS sequence generation information, RB index, etc. in the case of sPUCCH.
  • the range of resource configuration includes at least RB assignments in the case of sPUSCH.
  • the serving cell (or serving cell eNB) is previously 2 n uplinks.
  • the link resource may be configured for the UE through a higher layer configuration.
  • FIG. 8 is a diagram illustrating a method of multiplexing a base HARQ-ACK to an sPUCCH or an sPUSCH according to an embodiment of the present invention.
  • the serving cell or serving cell eNB performs 2 2 resource configuration (eg, resource configuration 1 to 4) for the UE. If the base HARQ-ACK multiplexed on the sPUXCH is (b 0 , b 1 ), the UE selects one resource from four resources and uses the selected resource as a resource of the sPUXCH.
  • This UE operation is similar to a method of indicating PDSCH RE mapping through a PDSCH rate matching and QuasiCoLocation indicator (PQI) field in LTE transmission mode 10.
  • This method can be applied when the number of bits of the base HARQ-ACK is small. If there is a carrier aggregation operation for the base TTI, this method is not efficient because n is large.
  • the method P320 for the method for the method P300 is a method in which the UE drops a bPUXCH and instead transmits an sPUXCH, and then the UE transmits a bPUXCH in the next bTTI that can be transmitted.
  • the method P320 may be applied when the URLLC PUXCH of the eMBB PUXCH and the URLLC PUXCH has a priority and the eMBB PUXCH is dropped or delayed.
  • the LTE system may also prioritize the transmission of the sTTI and delay the transmission of the bTTI. In this case, scheduling for next bTTI may overlap.
  • the serving cell or serving cell eNB sequentially allocates bPDSCH to the corresponding UE so that the UE sequentially transmits bPUCCH.
  • a case may be considered in which a bPUCCH is dropped in the current bTTI and an sTTI is transmitted instead.
  • the serving cell or serving cell eNB causes the UE to transmit bPUSCHs in succession, the bPUSCH may be dropped from the current bTTI and sTTI may be transmitted instead.
  • the serving cell or serving cell eNB instructs the UE to transmit bPUXCH consecutively without distinguishing bPUSCH or bPUCCH
  • the bPUXCH may be dropped from the current bTTI and sTTI may be transmitted instead.
  • This method is inefficient in terms of throughput of the eMBB since the bTTI may not continue to be transmitted when the sTTI is set periodically.
  • the UE is to send on the next bTTI, the bPUSCH to drop on the current bTTI (or bPUCCH) and on the next bTTI. (Or bPUCCH) can be multiplexed.
  • the UE If the bPUSCH dropped in the current bTTI is multiplexed with the bPUSCH in the next bTTI (first case), it is difficult for the UE to send all of the bPUSCHs without a separate instruction from the eNB. Since the PUSCH TPC of the current bTTI, the PUSCH DM-RS cyclic shift, and the number of layers are different from each other, the PUSCH TPC of the next bTTI, the PUSCH DM-RS cyclic shift, and the number of layers are generally different. Spatial multiplexing or frequency multiplexing two bPUSCHs is difficult. Therefore, the UE does not perform a separate operation for the bPUSCH dropped in the current bTTI.
  • the payload of the HARQ-ACK transmitted by the UE through the bPUCCH is 1 to 2 bits, etc.
  • 'PUCCH format 1b with channel selection' method (eg, method P310) may be used.
  • a resource of a bPUSCH is selected according to a combination of HARQ-ACKs transmitted through a bPUCCH allocated in a next bTTI, and a UE may transmit a bPUSCH in a next bTTI using the selected resource.
  • the serving cell (or serving cell eNB) may detect the bHARQ-ACK through blind detection.
  • the UE may reuse the information of the UL-related DCI received from the serving cell (or serving cell eNB) to transmit allocation information of the bPUSCH in the current bTTI.
  • the payload of HARQ-ACK transmitted in the next bTTI is large, this method is not used because the combination of HARQ-ACK grows exponentially.
  • the UE transmits the PUSCH and the PUCCH in the next bTTI.
  • the UE can reuse information of UL-related DCI for allocation of PUSCH transmitted in current bTTI.
  • the UE may select a resource of a bPUSCH to be transmitted in a next bTTI according to a combination of HARQ-ACKs dropped.
  • the serving cell or serving cell eNB
  • the serving cell detects the resources of the bPUSCH received at the next bTTI from the UE through blind detection, thereby performing HARQ.
  • the bit of the -ACK can be estimated.
  • this method does not apply when the payload of HARQ-ACK is large.
  • the UE when the 'simultaneous PUSCH and PUCCH' is configured for the UE, the UE transmits the PUSCH and the PUCCH in the next bTTI.
  • the LTE carrier aggregation method or the LTE HARQ-ACK bundling (or multiplexing) method may be used.
  • a method using 'PUCCH format 1b with channel selection', a method of converting a PUCCH format from format 1a to format 1b, or encoding a channel through payloads of PUCCH formats 3, 4, and 5 There is a way to redo the RE mapping. This corresponds to a method of adaptively converting a PUCCH format and a method of performing channel encoding and RE mapping by controlling the number of HARQ-ACK bits in the same PUCCH format.
  • PUCCH format may be used.
  • PUCCH format to be transmitted in the next bTTI was format 3
  • a scheme of transmitting through format 4 may be allowed because there are many HARQ-ACK bits transferred from the current bTTI.
  • FIGS. 9A, 9B, and 9C are diagrams illustrating RE mapping of sPUXCH and bPUSCH according to an embodiment of the present invention. Specifically, RE mapping of bPUSCH is illustrated in FIG. 9A, RE mapping of sTTI and bPUSCH is illustrated in FIG. 9B, and RE mapping of sTTI and 'bPUSCH with CSI' is illustrated in FIG. 9C.
  • the horizontal axis is the time axis (eg, slot) and the vertical axis is the frequency axis (eg, PRB).
  • Method P330 for Method P300 is a method for the UE puncturing a base PUSCH and transmitting an sPUXCH.
  • the UE when there is an sTTI to which the sPUXCH should be transmitted by the UE, the UE does not transmit a bPUSCH in time domain symbols belonging to the sTTI.
  • the time domain symbols excluded from this case include the DM-RS of the bPUSCH, as illustrated in FIG. 9B, and the UE Does not puncture the DM-RS of the bPUSCH even when transmitting the sPUXCH.
  • a UE uses a CSI element (eg, a CSI-RS resource indication (CRI), a rank indication (RI), a pre-coding matrix indication (PMI), a channel quality indication (CQI, etc.)) in a bPUSCH.
  • a CSI element eg, a CSI-RS resource indication (CRI), a rank indication (RI), a pre-coding matrix indication (PMI), a channel quality indication (CQI, etc.
  • CRI CSI-RS resource indication
  • PMI pre-coding matrix indication
  • CQI channel quality indication
  • this method reduces the bPUXCH decoding performance of the serving cell (or serving cell eNB), a retransmission procedure may be required.
  • the UE may retransmit the bPUSCH on an LTE PHICH or other UL grant.
  • this method may not be used because there is no retransmission procedure even if the serving cell (or serving cell eNB) fails to decode.
  • the serving cell (or serving cell eNB) may regard this case as a discontinuous transmission (DTx) of the bPDSCH and may transmit the bPDSCH through a DL assignment.
  • DTx discontinuous transmission
  • Method P340 for Method P300 is a method for the UE to rate match bPUSCH and transmit sPUXCH.
  • the UE when there is an sTTI to which the sPUXCH should be transmitted by the UE, the UE does not transmit a bPUSCH in time domain symbols belonging to the sTTI.
  • the time domain symbols excluded from this case include the DM-RS of the bPUSCH, as illustrated in FIG. 9B, and the UE Does not puncture the DM-RS of the bPUSCH.
  • a UE even when a UE multiplexes a CSI element (eg, CRI, RI, PMI, CQI, etc.) and a base HARQ-ACK in a bPUSCH, the UE transmits these sPUXCHs and transmits these CSI elements. Do not treat.
  • a CSI element eg, CRI, RI, PMI, CQI, etc.
  • the UE performs a rate matching of the bPUSCH on the remaining resources except for the sTTI resource among the granted resources. This may be applied even when the serving cell (or serving cell eNB) does not predict the transmission of the sPUXCH in advance.
  • the serving cell (or serving cell eNB) cannot predict the transmission of the sPUXCH in advance, so that the serving cell (or serving cell eNB) is satisfied so that the target BLER (e.g., 10%) is satisfied when the bPUSCH is transmitted by the UE in the granted resource.
  • UL grant may determine the RB allocation and the MCS of the bPUSCH.
  • sTTI resources are excluded from the transmission resources (transmission resources for bPUSCH) that the UE knows from the UL grant of the bPUSCH received from the serving cell (or serving cell eNB), which the serving cell (or serving cell eNB) predicts in advance.
  • the serving cell (or serving cell eNB) should instruct the UE to retransmit the corresponding bPUSCH.
  • the UE may perform bPUSCH RE mapping using the granted RB assignment and the MCS.
  • the method P400 configures the UE to multiplex sPUCCH on the basis of bPUCCH.
  • PUCCH formats In LTE, five PUCCH formats are defined. This PUCCH format is used for CQI reporting or HARQ-ACK reporting.
  • the following methods eg, method P410, etc. may be considered.
  • Method P410 for Method P400 is a symbol-level differential encoding method.
  • the PUCCH format 1b will be described as an example.
  • FIG. 10A and 10B illustrate a resource block (PRB) of PUCCH format 1, 1a, or 1b according to an embodiment of the present invention.
  • PRB resource block
  • FIG. 10A illustrates a case of a normal cyclic prefix (CP)
  • FIG. 10B illustrates a case of an extended CP.
  • CP normal cyclic prefix
  • FIGS. 9A to 9C, 10A to 10B, 11A to 11B, 12A to 12B, and 13A to 13B illustrates a resource block (PRB) of PUCCH format 1, 1a, or 1b according to an embodiment of the present invention.
  • FIG. 10A illustrates a case of a normal cyclic prefix (CP)
  • FIG. 10B illustrates a case of an extended CP.
  • LTE PUCCH format 1b and normal CP will be described as an example.
  • Resources for LTE PUCCH format 1b include a payload RE and a DM-RS RE.
  • one slot includes seven time domain symbols (eg, single carrier (SC) -frequency division multiple access (FDMA) symbols).
  • SC single carrier
  • FDMA frequency division multiple access
  • the DM-RS is mapped to three time domain symbols among seven time domain symbols belonging to one slot, and the payload is mapped to the remaining four time domain symbols.
  • one slot includes six time domain symbols (e.g., SC-FDMA symbols).
  • the DM-RS is mapped to two time domain symbols among six time domain symbols belonging to one slot, and the payload is mapped to the remaining four time domain symbols.
  • PUCCH format 1a encodes 1 bit HARQ-ACK
  • PUCCH format 1b encodes 2 bits HARQ-ACK. Since HARQ-ACK is represented by 1 bit or 2 bits, HARQ-ACK is transmitted to PUCCH payload RE through time spreading and frequency spreading for one quadrature phase shift keying (QPSK) symbol. ACK is mapped.
  • QPSK quadrature phase shift keying
  • differential encoding may be applied to the PUCCH payload RE.
  • the sTTI consists of two time domain symbols (eg, SC-FDMA symbols).
  • a base HARQ-ACK bit included in slot 0 and slot 1 is represented by [b 0 , b 1 ]
  • a short HARQ-ACK bit included in slot 0 and slot 1 is represented by [s 0 , s 1 ].
  • the first two time domain symbols are mapped through channel coding based on [b 0 , b 1 ], but the seven time domains included in slot 0
  • the latter two time domain symbols among the domain symbols may be mapped through channel coding based on [b 0 + s 0 , b 1 + s 1 ].
  • + means phase encoding.
  • (Complex) is expressed in bHARQ bits, May be expressed as sHARQ bits. Since the encoding process of PUCCH format 1b assumes frequency domain spreading using a sequence, the encoding process of PUCCH format 1b is It can be expressed as a (vector). Where (f gh (n s ) + f ss ) is a UE-specific pseudo-random value, belongs to ⁇ 0, ..., 29 ⁇ , and r () is used by the UE The resulting sequence is expressed in the form of a vector.
  • f gh Means a group-hopping pattern, and the formula Given by f gh Is initialized for each radio frame based on bTTI. It is expressed as
  • n s denotes the slot index on the basis of base TTI
  • f ss refers to the movement pattern sequence (sequence-shift pattern).
  • the cyclic shift can be calculated by dividing into a cell-specific cyclic shift and a UE-specific cyclic shift.
  • the calculation of the cyclic shift is essentially performed for interference randomization, but the calculation method and parameters thereof may follow the method defined in the specification of LTE advanced pro.
  • the UE selects the t th time domain symbol (e.g., an SC-FDMA symbol).
  • the (t + 1) th time domain silbol (e.g. SC-FDMA symbol) Can be expressed as
  • the serving cell or serving cell eNB) receives this and performs de-spreading Detect
  • the serving cell or serving cell eNB) Can detect [s 0 , s 1 ].
  • UE1 sends b at next symbol Is transmitted, and UE2 transmits c at the next symbol. In this case, the case of transmitting a packet may be considered.
  • the payload sent by UE1 is Corresponding to the payload transmitted by UE2, Corresponds to
  • the signal received by the serving cell is Corresponds to h 1 means the effective channel response after UE1 combines the receiving antenna (s) of the serving cell (or serving cell eNB).
  • h 2 means an effective channel response after UE2 combines the receiving antenna (s) of the serving cell (or serving cell eNB).
  • Z means noise obtained at the receiving antenna of the serving cell (or serving cell eNB).
  • r () means a sequence used by UE1, and s () means a sequence used by UE2.
  • y () means a row vector of a signal received by the serving cell (or serving cell eNB).
  • z () denotes noise received at a receiving antenna of a serving cell (or serving cell eNB).
  • b means a HARQ-ACK bit to be transmitted by the UE1, 1 means a row vector consisting of one.
  • z '() and z' '() refer to noise obtained after the sequence used by UE1 is de-spreaded.
  • the above operation relates to the mapping for one time domain symbol (eg, SC-FDMA symbol).
  • a method of performing differential encoding on each of at least one time domain symbol belonging to a short TTI is a serving cell (or serving cell) by combining results obtained from more time domain symbols. detection probability in an eNB) can be increased.
  • this operation may be repeated to perform time division multiplexing (TDM).
  • TDM time division multiplexing
  • the UE may transmit a short HARQ-ACK while maintaining the performance (eg, detection probability, latency requirement, etc.) of the base HARQ-ACK.
  • the UE can transmit a short HARQ-ACK while minimizing a change in the bPUCCH for the base HARQ-ACK, the complexity is low.
  • the above description corresponds to a method for distinguishing between ACK and NACK of a short PUCCH.
  • DTx eg, when the UE has not received a DCI specifying the PDSCH based on the short TTI
  • the following method may be applied.
  • Method P411 for Method P410 is a 'DTx-indication in phase modulation' method using phase modulation.
  • phase modulation is applied to the base sequence.
  • ego Is a function of cell-specific and UE-specific parameters, Denotes the number of subcarriers constituting one PRB (eg, 12), n s denotes a slot index based on a base TTI, and l denotes an index of a time domain symbol. An integer multiple of this cyclic shift is applied to the sequence element index. .
  • the serving cell (or serving cell eNB) transmits only the base TTI to the UE through PDSCH, or the UE cannot receive DCI for short TTI. This is the case with DTx. In this case, the phase generation method of the LTE PUCCH format is applied as it is.
  • the serving cell may assign a number of cyclic shift values to the UE, and the UE selects a specific cyclic shift value among the plurality of cyclic shift values in the case of ACK, and NACK In this case, another specific cyclic shift value may be selected, and the selected cyclic shift value may be applied to the sequence element index.
  • the serving cell (or serving cell eNB) detects the sequence element (or frequency domain spreading sequence) through blind detection to first determine whether the UE corresponds to DTx. If the serving cell (or serving cell eNB) determines that the corresponding UE does not correspond to DTx, the serving cell (or serving cell eNB) determines whether the signal of the UE is ACK or NACK using method P410.
  • sequence element or frequency domain spreading sequence
  • Method P412 for Method P410 is a 'DTx-indication in sequence index domain' method that uses a sequence index.
  • a base sequence used for the LTE PUCCH (base sequence) index is determined based on the hopping group (f gh (n s)) and the shift sequence (f ss).
  • the sequence index used for DM-RS and the sequence index used for payload are the same. If sTTI (or subslot m s ) is introduced, this sequence index can be generated at m s . Thus, in case of a non-DTx in which the UE should transmit a short HARQ-ACK, the sequence index used for the corresponding subslot is different from the sequence index used for the base HARQ-ACK.
  • the serving cell detects the sequence index through blind detection to first determine whether the UE corresponds to DTx. When the serving cell (or serving cell eNB) determines that the UE does not correspond to DTx, the serving cell (or serving cell eNB) determines whether the signal of the UE is ACK or NACK using method P410.
  • PUCCH format 3 will be described as an example.
  • LTE PUCCH format 3 also undergoes encoding similar to PUCCH format 1b, but LTE PUCCH format 3 considers time domain spreading and does not consider frequency domain spreading. Symbol-level differential encoding for PUCCH format 3 may be performed similarly to symbol level differential encoding for PUCCH format 1b. However, since PUCCH format 3 does not consider frequency domain spreading, inter-UE interference occurs, and interference experienced by a serving cell (or serving cell eNB) in a time domain symbol period in which PUCCH format 3 is received. If the amount of is changed, the reception performance of PUCCH format 3 of the serving cell (or serving cell eNB) is reduced.
  • FIG. 11A and 11B illustrate a resource block (PRB) of LTE PUCCH format 3 according to an embodiment of the present invention.
  • PRB resource block
  • the last time domain symbol is not transmitted. This applies equally or similarly to FIGS. 9A to 9C, 10A to 10B, 11A to 11B, 12A to 12B, and 13A to 13B.
  • the value of RE with LTE PUCCH format 3 P denotes the logical index of the antenna port (e.g., 0, 1, 2, 3, etc.), n denotes the index of a time domain symbol (e.g., SC-FDMA symbol), and i denotes the subcarrier index.
  • N 0 corresponds to 5 in the case of normal PUCCH format 3 and 4 in the case of shorted PUCCH format 3.
  • d (i) means an encoded HARQ-ACK bit.
  • n cs () denotes a cyclic shift
  • c () denotes a pseudo-random sequence used in LTE.
  • N symb corresponds to 7 in the case of a normal CP and 6 in the case of an extended CP.
  • m cs (n s , l) may be obtained through normalization of UE-specific values.
  • m cs (n s , l) may be obtained as in the following equation.
  • the serving cell (or serving cell eNB) sets ⁇ to the UE through higher layer configuration, and ⁇ has a value of 1, 2, and 3.
  • ⁇ has a value of 1, 2, and 3.
  • c is 2 for normal CP and 1 for extended CP.
  • the serving cell (or serving cell eNB) sets n ( 3, p ) to the UE through a higher layer configuration.
  • c means the number of DM-RS symbols used for PUCCH format 3.
  • Method P420 for Method P400 is a PUCCH rate matching method.
  • the case where the base PUCCH is not spread may be considered.
  • multiplexing of channel coding or resource mapping cannot be considered, and multiplexing of short PUCCH can be considered.
  • PUCCH format 4 will be described as an example.
  • LTE PUCCH format 4 has a form of PUSCH.
  • a spreading factor is used as 1 and at least one RB may be used according to the RRC configuration.
  • the serving cell (or serving cell eNB) may set more frequency resources of PUCCH format 4 for multiplexing short PUCCH resources.
  • the transmission mode setting and the report setting may be used.
  • FIGS. 12A and 12B This method is illustrated in FIGS. 12A and 12B.
  • FIG. 12A and 12B illustrate slots of the LTE PUCCH format 4 when a normal CP is used according to an embodiment of the present invention.
  • FIG. 12A illustrates a base PUCCH slot
  • FIG. 12B illustrates a slot in which a base PUCCH and a short PUCCH are multiplexed.
  • the horizontal axis is the time axis (eg, slot) and the vertical axis is the frequency axis (eg, configured bandwidth).
  • the base HARQ-ACK uses PUCCH format 4. Since two short HARQ-ACKs occur, two short PUCCHs corresponding thereto are illustrated in FIG. 12B.
  • 12A and 12B illustrate a case in which a DM-RS is mapped to a fourth time domain among seven time domain symbols (eg, SC-FDMA symbols) included in a slot.
  • seven time domain symbols eg, SC-FDMA symbols
  • a short PUCCH is set so that the detection probability and false alarm probability required by the serving cell (or serving cell eNB) are satisfied through encoding and spreading of HARQ-ACK.
  • channel coding such as Reed Muller code, tail-biting convolutional code (TBCC), turbo, polar, or the like may be applied.
  • this short PUCCH may be transmitted alone by the UE or may be transmitted multiplexed with the base PUCCH.
  • the short PUCCH may have a different channel encoding scheme and code rate (and RE mapping) than the base PUCCH.
  • the base PUCCH and the short PUCCH share a DM-RS.
  • RE mapping using a plurality of non-contiguous subcarriers is performed on a short PUCCH.
  • the RE that the short PUCCH can use is emptied, PUCCH rate matching is performed, and RE mapping is performed.
  • the UE may perform transmission power control for each time domain symbol (eg, SC-FDMA symbol).
  • the serving cell or serving cell eNB
  • Method P430 for Method P400 is an OCC selection method.
  • the base PUCCH may spread adjacent payload REs through the OCC.
  • the serving cell or serving cell eNB sets up several OCC sets to the UE, and the UE uses different OCCs according to the HARQ-ACK bit for the short PUCCH.
  • the eNB may transmit the HARQ-ACK bit for the short PUCCH. This approach does not orthogonalize inter-UE interference with OCC and instead dedicates OCC to payload multiplexing, resulting in less UE multiplexing capability.
  • PUCCH format 5 will be described as an example.
  • the serving cell (or serving cell eNB) configures the OCC-2 (length 2 OCC) used by the UE to the UE through higher layer signaling.
  • OCC-2 length 2 OCC
  • PUCCH format 5 spreads one encoded PUCCH RE into two in the frequency domain with one DM-RS symbol.
  • FIG. 13A and 13B illustrate slots of an LTE PUCCH format 5 when a normal CP is used according to an embodiment of the present invention.
  • FIG. 13A illustrates a base PUCCH slot
  • FIG. 13B illustrates a slot in which a base PUCCH and a short PUCCH are multiplexed. Only base PUCCH is illustrated in FIG. 13A, and an RE pair to which an OCC is applied is illustrated in FIG. 13B. Assume that there are two short TTIs.
  • the UE may determine the OCC-2 dynamically. In this case, the UE applies frequency domain spreading to [+1, +1] or frequency domain spreading to [+1, -1] according to the HARQ-ACK bit for short PUCCH. can do. Since there are six such sets of subcarriers, the detection performance of the HARQ-ACK bit for the short PUCCH can be maintained as high as possible. In TS 36.211, n oc is set to the UE through higher layer signaling.
  • This method may be applied to intra-cell inter-UE interference, but has a disadvantage of being susceptible to inter-cell inter-UE interference.
  • a method of increasing the frequency domain spreading factor may be used.
  • the standard can further define the frequency domain OCC.
  • the UE may select the frequency domain OCC according to a combination of HARQ-ACK bit (s) for a short PUCCH.
  • the UE may generate a base PUCCH format to which the selected OCC is applied and indirectly transmit a HARQ-ACK bit for a short PUCCH to a serving cell (or serving cell eNB).
  • Method P500 is a puncturing method.
  • the method P500 does not transmit a bPUCCH in a specific UL subslot among UL symbols in which a bPUCCH is transmitted but instead transmits an sPUCCH.
  • This method is illustrated in FIGS. 14A and 14B. 14B illustrates a case where a subslot includes two time domain symbols.
  • FIG. 14A and 14B illustrate puncturing of short PUCCH according to an embodiment of the present invention. Specifically, FIG. 14A illustrates 'bPUCCH puncturing with DM-RS sharing' for sharing the DM-RS, and FIG. 14B illustrates 'bPUCCH puncturing with separate DM-RS' for not sharing the DM-RS.
  • the method P330 confines the puncturing pattern or rate matching to specific time domain symbols and specific subcarriers, but the method P500 applies the puncturing pattern to all subcarriers belonging to a specific time domain symbol.
  • FIG. 14A illustrates a case in which a sPUCCH and a bPUCCH share a DM-RS.
  • 14B illustrates a case in which the sPUCCH and bPUCCH do not share the DM-RS.
  • the payload of the corresponding base PUCCH is transmitted.
  • Channel estimation for bandwidth and time domain symbols can be performed correctly.
  • a separate DM-RS for the sPUCCH should be allocated. Since sPUCCH and bPUCCH generally have different frequency resources (eg f 1 , f 2 ), in this case, sPUCCH and bPUCCH cannot share DM-RS with each other. Accordingly, the number of DM-RS symbols or DM-RS REs that the serving cell (or serving cell eNB) receiving the sPUCCH or bPUCCH to use for channel estimation is relatively reduced. Therefore, in order for the sPUCCH sharing the DM-RS to replace the bPUCCH in the form illustrated in FIG. 14A, puncturing may be performed.
  • PDXCH means PDCCH or PDSCH.
  • Short PDXCH may be transmitted in a relatively large number of time domain symbols and may be transmitted in a longer time interval than bPDXCH (base PDXCH).
  • sPDXCH short PDXCH
  • base PDXCH has a lower subcarrier spacing than bPDXCH (base PDXCH), but may be transmitted in the same number of time domain symbols and may be transmitted in a longer time interval.
  • the UE since the UE separately transmits the DM-RS for transmitting the sPUCCH, the number of time domain symbols punctured in the bPUCCH increases to further consider the DM-RS for the sPUCCH, or vice versa. The number of time domain symbols occupied by the payload of is reduced. In the case where the sPUCCH and bPUCCH share the DM-RS, this disadvantage can be solved.
  • both the bPUCCH and the sPUCCH must be located in the frequency resource occupied by the DM-RS so that the serving cell (or serving cell eNB) can perform demodulation.
  • a dynamically signaled parameter used in the sPUCCH resource index may be derived from the bPDCCH rather than the sPDCCH.
  • the format 1b is taken as an example.
  • the base HARQ-ACK transmitted by the bPUCCH HARQ-ACK symbol for a short PUCCH It is called.
  • Each complex number corresponds to 2 bits.
  • the bPUCCH has a form of the LTE PUCCH format 1b, it has three DM-RS symbols and four payload symbols (eg, time domain symbols for payload).
  • the UE spreads [d 0 , d 0 , d 0 , d 0 ] in each UL symbol, respectively, as in LTE.
  • the UE should allocate at least one UL symbol to the HARQ-ACK bit for the bPUCCH in order to transmit the HARQ-ACK bit for the bPUCCH as well. Therefore, the UE can transmit up to three HARQ-ACK symbols (or up to six HARQ-ACK bits) to be transmitted on the sPUCCH within one PRB constituting the bPUCCH.
  • HARQ-ACK symbols that a UE intends to transmit through sPUCCH within one PRB constituting bPUCCH based on PUCCH format 1b may be transmitted through puncturing of bPUCCH.
  • five or more HARQ-ACK symbols eg, four or more HARQ-ACK symbols and an additional one base HARQ-ACK symbol intended to be included in the sPUCCH
  • source encoding or channel encoding should be used. This is not suitable for the URLLC scenario in which the sPUCCH must be suddenly transmitted, but is more suitable for the carrier aggregation scenario or the dual connectivity scenario in which the UE can predict the existence of HARQ-ACK bits using the short PUCCH in advance.
  • one UL out of four HARQ-ACK symbols if a total of four or less HARQ-ACK symbols including HARQ-ACK symbols for three or fewer short PUCCHs are transmitted.
  • An average of one HARQ-ACK symbol may be allocated to the symbol. For example, when a HARQ-ACK symbol for a short PUCCH is to be transmitted in a third bPUCCH payload symbol among a total of four payload symbols, it is represented by [d 0 , d 0 , d 1 , d 0 ]. Can be.
  • the serving cell (or serving cell eNB) is short to the UE. short) corresponds to a case where three consecutive scheduling assignments for the PDSCH are delivered in succession, and may be expressed as [d 0 , d 1 , d 2 , d 3 ].
  • the UE When the UE generates a bPUCCH payload symbol, the UE performs encoding by using the HARQ-ACK bits determined as described above.
  • the serving cell (or serving cell eNB) cannot distinguish whether the HARQ-ACK received in the interval of the sTTI corresponds to part of bPUCCH (ie, DTx) or part of short PUCCH. Specifically, if the UE does not receive the sPDCCH, the UE should transmit d 0 because it does not have information about d i .
  • the demodulated HARQ-ACK is HARQ-ACK for the base PDSCH (eg, d 0 ) or HARQ-ACK for the short PDSCH.
  • the UE transmits HARQ-ACK bits for the sPUCCH while using the OCC in transmitting the bPUCCH
  • the value of the time domain symbol is punctured and changed. This reduces the time domain multiplexing performance obtained by the serving cell (or serving cell eNB).
  • Method P510 for method P500 is a 'DTx detection by subslot index scrambling' method.
  • Sequence index used for the LTE PUCCH is determined based on the hopping group (f gh (n s)) and the shift sequence (f ss).
  • the sequence index used for DM-RS and the sequence index used for payload are the same. If sTTI (or subslot m s ) is introduced, this sequence index can be generated using m s as a parameter. Therefore, in case of a non-DTx in which the UE should transmit HARQ-ACK bits using sPUCCH, the sequence index used in the corresponding subslot may be defined differently from the sequence index used for HARQ-ACK bits using base PUCCH. have.
  • the serving cell (or serving cell eNB) detects the sequence index applied to the corresponding sTTI (or subslot m s ) through blind detection on the received bPUCCH, and determines whether the UE corresponds to DTx or non-DTx. do. That is, the serving cell (or serving cell eNB) may distinguish whether the HARQ-ACK received from the corresponding sTTI is d 0 or d i (where i> 0).
  • Method P520 for Method P500 is a 'sPUCCH by sequence selection' method.
  • Method P520 is a method of detecting a HARQ-ACK symbol for a corresponding short PUCCH by detecting a sequence index from a bPUCCH received by a serving cell (or serving cell eNB) and assigned a sequence index as a resource. Since the HARQ-ACK symbol for the sPUCCH supported by one subslot is generated from two bits and has four cases, the UE can derive a sequence index accordingly.
  • the LTE PUCCH determines the sequence index based on (f gh (n s ) + f ss ) mod 30.
  • An offset ⁇ ss applied to the HARQ-ACK bit for the short PUCCH may be additionally introduced here.
  • UE is the sequence index used in the sub slot s m, Can be derived based on
  • the possible offset value may consist of four natural numbers and may be defined as a function of m s (eg, ⁇ ss (m s )) for interference randomization.
  • the serving cell (or serving cell eNB) can detect the HARQ-ACK symbol indirectly by detecting the sequence index using cross correlation.
  • the serving cell (or serving cell eNB) may determine whether DTx. If d 0 is applied to the generated sequence by the UE, since the base HARQ-ACK can utilize substantially four payload symbols, the coverage of the bPUCCH can be maintained to a large extent. However, depending on the amount of residual interference in the interference randomization process, the coverage of the bPUCCH may be somewhat reduced.
  • base sequences with high cross correlation performance can be selected. For example, a separate index is combined among the 30 base sequences allowed for LTE PUCCH.
  • a sequence index set may be determined so that the cross correlation between k sequences is small.
  • the norm of pairwise cross correlation for three length-12 sequences may be two, and autocorrelation may correspond to twelve.
  • the serving cell (or serving cell eNB) can easily determine whether DTx and intra-cell interference Intra-cell interference may also be randomized. If different UEs transmit the same sequence to the serving cell (or serving cell eNB) in the same subslot, the serving cell (or serving cell eNB) uses one UE-specific cyclic shift. Only UE can be distinguished.
  • d u , d v represents a HARQ-ACK symbol
  • r (n) represents a sequence element corresponding to the n-th subcarrier
  • d u can be calculated. If addition is performed on subcarrier n to detect d u , then the amount of residual interference is It is proportional to the size of norm. If the difference between the UE-specific cyclic shifts is sufficiently random, the magnitude of the value is not so large compared to one. Therefore, since the amount of residual interference is not so large, the coverage at which the transmission of d u arrives is not significantly affected by d v .
  • the UE determines a sequence index based on (f gh (n s ) + f ss ) mod 30 as in LTE PUCCH and cyclic shift values used in a specific subslot m s You can decide differently.
  • the UE may generate a UL symbol belonging to a subslot by selecting a cyclic shift value according to an HARQ-ACK symbol to be transmitted using a Short PUCCH.
  • the serving cell (or serving cell eNB) may estimate the value of the HARQ-ACK symbol by detecting the cyclic shift value applied to the subslot m s .
  • the modified PUCCH format 1b is described as an example.
  • FIG. 14A illustrates a case in which the DM-RS symbol index for the LTE PUCCH format 1b is used the same and sPUCCH and bPUCCH share the DM-RS.
  • FIG. 15 a case in which the DM-RS symbol index of the base PUCCH is used differently is illustrated in FIG. 15.
  • FIG. 15 illustrates three UL control subslots in a base PUCCH having seven UL symbols according to an embodiment of the present invention, and each UL control subslot includes three, two, and two UL symbols (eg, ( 3, 2, 2)).
  • the UL slot consists of seven UL symbols, and the UL slot includes three UL control subslots.
  • Three UL control subslots belonging to the UL slot may be represented by (3, 2, 2).
  • the first of three UL control subslots (UL control subslot 1) includes three time domain symbols
  • the second control subslot (UL control subslot 2) includes two time domain symbols
  • 3 The first subslot (UL control subslot 3) contains two time domain symbols.
  • UL control subslot 1 includes two payload symbols
  • UL control subslot 2 and UL control subslot 3 include one payload symbol.
  • a UL slot may be configured.
  • the UL slot may be configured as (2,3,2) or (2,2,3), and in this case, the following method may be equally applied.
  • the gNB (or eNB) is The UL channel estimation can be completed earlier. Through this, demodulation latency of the UL control channel may be reduced.
  • FIG. 16A and 16B illustrate a case in which a base PUCCH is punctured through one short PUCCH according to an embodiment of the present invention.
  • FIG. 16A illustrates a case where the UL control subslot 1 is punctured
  • FIG. 16B illustrates a case where the UL control subslot 2 is punctured.
  • FIG. 17A and 17B illustrate a case in which a base PUCCH is punctured through two or more short PUCCHs according to an embodiment of the present invention.
  • FIG. 17A illustrates a case where two UL control subslots are punctured
  • FIG. 17B illustrates a case where three UL control subslots are punctured.
  • FIG. 17A illustrates a case in which the UL control subslot 1 and the UL control subslot 2 are punctured through the short PUCCH among the cases where the base PUCCH is punctured through two short PUCCHs.
  • the DM-RS symbol index corresponds to the first symbol and the last to second symbol among the seven UL symbols belonging to the UL slot.
  • the base PUCCH is transmitted only in the last symbol among the seven UL symbols belonging to the UL slot.
  • FIG. 17B the case where the base PUCCH is punctured through three short PUCCHs is illustrated. That is, UL control subslot 1, UL control subslot 2, and UL control subslot 3 are punctured via a short PUCCH.
  • the DM-RS symbol is located in the first symbol among seven UL symbols belonging to the UL slot. In this case, the twelve subcarriers and two time domain symbols that make up the short PUCCH correspond to 24 REs.
  • a short PUCCH can be defined.
  • the UE multiplies the sequence by the HARQ-ACK symbol to generate a short PUCCH, and transmits it to the serving cell (or serving cell eNB).
  • Method P530 for Method P500 is a method for separately defining a DM-RS.
  • the method P530 allocates some of the 24 REs for the DM-RS and others for the payload such as a HARQ-ACK symbol.
  • the first UL symbol belonging to the UL control subslot 1 is allocated separately for the DM-RS, and consequently, the first and second time domain symbols among the time domain symbols belonging to the UL slot are allocated for the DM-RS.
  • the second UL symbol belonging to UL control subslot 1 carries the payload.
  • the first time domain symbol belonging to UL control subslot 2 is allocated for DM-RS, and the second UL symbol belonging to UL control subslot 2 is used to pay the payload. To pass.
  • the first time domain symbol belonging to UL control subslot 3 is allocated for DM-RS, and the second UL symbol belonging to UL control subslot 3 is used to pay the payload. To pass.
  • the UE may further perform DFT preprocessing on the UL symbol carrying the payload to reduce the peak to average power ratio (PAPR).
  • PAPR peak to average power ratio
  • Method P540 for Method P500 is a method that does not define DM-RS separately.
  • two 12-length sequences may be used, and the two sequences may be mapped symbol-by-symbol to the two time domain symbols.
  • one 24-length sequence may be used to process two time domain symbols. Even when puncturing is performed, since at least one DM-RS symbol exists, the HARQ-ACK bit may be transmitted based on angle information of the sequence.
  • Method P541 for Method P540 is a method that utilizes a 24-length sequence.
  • Method P541 uses one sequence (sequence) over 24 REs.
  • serving cell or serving cell gNB, serving cell eNB
  • serving cell gNB serving cell gNB
  • serving cell eNB Since the serving cell (or serving cell gNB, serving cell eNB) cannot perform coherent detection because there is no DM-RS, non-coherent sequence detection is performed.
  • the UE receives four sequences (sequences) in advance, and selects one sequence (sequence) among four sequences (sequences) according to HARQ-ACK 2 bits.
  • the length of the sequence is 24.
  • FIG. 18A and 18B are diagrams illustrating a RE mapping method of a sequence (sequence) according to an embodiment of the present invention. Specifically, subcarrier-symbol mapping is illustrated in FIG. 18A, and symbol-subcarrier mapping is illustrated in FIG. 18B.
  • the UE may perform frequency mapping before time mapping and then time mapping.
  • the UE may perform time mapping before frequency mapping and then perform frequency mapping.
  • the serving cell since these REs belong to the same physical resource block (PRB), the same channel estimation is utilized, and since these REs are for one sequence (sequence), the serving cell (or serving cell gNB, serving cell eNB) The HARQ-ACK bit cannot be detected in advance until all REs having a sequence are received. No matter how the UE permutates the sequence (sequence) and RE mapping, the serving cell (or serving cell gNB, serving cell eNB) is unlikely to expect a performance gain.
  • PRB physical resource block
  • a bundle of twelve REs may be mapped to one sequence (sequence) and two bundles may be bundled via OCC.
  • the LTE system may use a sequence of length 12 (sequence) twice and generate a sequence of 24 lengths (sequence) using a time domain OCC.
  • Modified PUSCH is described as an example.
  • FIG. 19 illustrates a UL control subslot structure using a PUSCH PRB according to an embodiment of the present invention.
  • UL slot consists of seven time domain symbols
  • one time domain symbol may be allocated for the DM-RS, and the remaining six time domain symbols may constitute three UL control subslots.
  • the DM-RS symbol may be located in the middle of the UL slot (ie, the fourth time domain symbol of the seven time domain symbols) and is not punctured, multiplexing with the PUSCH DM-RS (eg, CDM ( code division multiplexing)
  • UL control subslot 1 and UL control subslot 3 include two consecutive UL symbols
  • UL control subslot 2 is a DM-RS symbol among the three symbols. It may include two UL symbols except for.
  • the computing device TN100 of FIG. 20 may be a UE, serving cell, eNB, gNB, or the like described herein.
  • the computing device TN100 of FIG. 20 may be a wireless device, a communication node, a transmitter, or a receiver.
  • the computing device TN100 may include at least one processor TN110, a transceiver TN120 connected to a network to perform communication, and a memory TN130.
  • the computing device TN100 may further include a storage device TN140, an input interface device TN150, an output interface device TN160, and the like. Components included in the computing device TN100 may be connected by a bus TN170 to communicate with each other.
  • the processor TN110 may execute a program command stored in at least one of the memory TN130 and the storage device TN140.
  • the processor TN110 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to an embodiment of the present invention are performed.
  • Processor TN110 may be configured to implement the procedures, functions, and methods described in connection with embodiments of the present invention.
  • the processor TN110 may control each component of the computing device TN100.
  • Each of the memory TN130 and the storage device TN140 may store various information related to an operation of the processor TN110.
  • Each of the memory TN130 and the storage device TN140 may be configured of at least one of a volatile storage medium and a nonvolatile storage medium.
  • the memory TN130 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).
  • the transceiver TN120 may transmit or receive a wired signal or a wireless signal.
  • the computing device TN100 may have a single antenna or multiple antennas.
  • the embodiment of the present invention is not implemented only through the apparatus and / or method described so far, but may be implemented through a program that realizes a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.
  • Such implementations can be readily implemented by those skilled in the art from the description of the above-described embodiments.

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

Abstract

La présente invention concerne un procédé de transmission de liaison montante d'un premier nœud de communication. Lorsqu'un créneau de temps pilote de liaison montante (UpPTS) d'une sous-trame spéciale et une première sous-trame (UL) de liaison montante sont agrégées en tant qu'une sous-trame UL étendue, le premier nœud de communication reçoit une configuration de signal de référence destinée au UpPTS à partir d'un second nœud de communication. En outre, lorsque le nombre de symboles de domaine de temps appartenant au UpPTS est inférieur ou égal à un nombre prédéterminé, le premier nœud de communication attribue un signal de référence à la première sous-trame UL parmi le UpPTS et la première sous-trame UL sur la base de la configuration de signal de référence.
PCT/KR2017/003716 2016-04-05 2017-04-05 Procédé et dispositif destinés à la transmission de liaison montante à l'aide de sous-trame de liaison montante étendue WO2017176044A1 (fr)

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KR10-2016-0041940 2016-04-05
KR20160041940 2016-04-05
KR10-2016-0103035 2016-08-12
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KR10-2016-0126985 2016-09-30
KR10-2016-0147312 2016-11-07
KR20160147312 2016-11-07
KR10-2016-0166029 2016-12-07
KR20160166029 2016-12-07
KR10-2017-0043863 2017-04-04
KR1020170043863A KR102410282B1 (ko) 2016-04-05 2017-04-04 확장 상향링크 서브프레임을 이용한 상향링크 전송 방법 및 장치

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