WO2013187603A1 - Procédé d'émission et de réception d'un signal de référence de sondage de liaison montante et terminal associé - Google Patents

Procédé d'émission et de réception d'un signal de référence de sondage de liaison montante et terminal associé Download PDF

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Publication number
WO2013187603A1
WO2013187603A1 PCT/KR2013/004013 KR2013004013W WO2013187603A1 WO 2013187603 A1 WO2013187603 A1 WO 2013187603A1 KR 2013004013 W KR2013004013 W KR 2013004013W WO 2013187603 A1 WO2013187603 A1 WO 2013187603A1
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WO
WIPO (PCT)
Prior art keywords
reference signal
transmission
uplink
sounding reference
terminal
Prior art date
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PCT/KR2013/004013
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English (en)
Korean (ko)
Inventor
노민석
Original Assignee
주식회사 케이티
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 KR1020120141245A external-priority patent/KR101647868B1/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to US14/406,779 priority Critical patent/US9756616B2/en
Publication of WO2013187603A1 publication Critical patent/WO2013187603A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the present invention relates to an uplink sounding reference signal transmission and reception method and a terminal thereof, and more particularly, to an uplink channel, an uplink sounding reference signal transmission and reception method associated with an uplink channel, and a terminal thereof.
  • uplink channel state is measured and channel is used for uplink frequency-dependent scheduling. It was necessary to transmit a sounding reference signal (SRS) used for measuring uplink / downlink channel states for downlink beamforming using channel reciprocity.
  • SRS sounding reference signal
  • an embodiment of the present invention is independent of the physical cell ID of the one transmission and reception point from one transmission point of two or more different transmission and reception points, and associated with an uplink channel, Receiving terminal-specific configuration information indicating a link reference signal ID; Generating a sounding reference signal using the uplink reference signal ID; And transmitting the generated sounding reference signal to a transmission / reception point indicated by the uplink reference signal ID.
  • an uplink reference signal ID which is independent of a physical cell ID of the one transmit / receive point from one first transmit / receive point among two or more different transmit / receive points and associated with an uplink channel
  • Receiving unit for receiving the terminal-specific configuration information indicating;
  • a controller configured to generate a sounding reference signal using the uplink reference signal ID;
  • a transmitter for transmitting the generated sounding reference signal to a transmission / reception point indicated by the uplink reference signal ID.
  • one transmit / receive point of two or more different transmit / receive points is independent of a physical cell ID of the one transmit / receive point, and indicates an uplink reference signal ID associated with an uplink channel. Transmitting terminal-specific configuration information to the terminal; A method for receiving an uplink sounding reference signal of a transmit / receive point comprising receiving a sounding reference signal generated by the uplink reference signal ID using the uplink reference signal ID from the terminal. do.
  • FIG. 1 illustrates an example of a wireless communication system to which embodiments are applied.
  • FIG. 2 illustrates a general uplink / downlink data transmission method in a CoMP scenario in which transmission / reception points use different cell IDs and in a heterogeneous network.
  • FIG. 3 illustrates a method for transmitting uplink / downlink data in a CoMP scenario in which transmission / reception points use the same cell ID.
  • FIG. 4 is a flowchart illustrating a method of transmitting an uplink reference signal of a terminal according to an embodiment.
  • FIG. 5 is a flowchart of a sounding reference signal transmission method when the physical uplink channel is PUCCH in the sounding reference signal transmission method shown in FIG. 4.
  • FIG. 6 illustrates an example in which all uplink-related channels are transmitted to transmit / receive points different from the transmit / receive points to which the UE belongs in a CoMP implementation in which transmit / receive points use different cell IDs (Cell ID # 1 and Cell ID # 2). Drawing.
  • FIG. 7 illustrates an example in which all uplink-related channels are transmitted to transmit / receive points different from the transmit / receive points to which the UE belongs in a CoMP implementation in which transmit / receive points use the same cell ID (Cell ID # 0).
  • FIG. 8 illustrates an example in which transmission and reception points are transmitted in association with a sounding reference signal and a PUCCH in a CoMP implementation using different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 9 is a diagram illustrating an example in which a sounding reference signal and a PUCCH are transmitted in association with a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • FIG. 10 illustrates an example in which only aperiodic sounding reference signals are transmitted in association with a PUCCH in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 11 illustrates an example in which only aperiodic sounding reference signals are transmitted in association with a PUCCH in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • FIG. 12 is a flowchart of a sounding reference signal transmission method when the physical uplink channel is a PUSCH in the sounding reference signal transmission method shown in FIG. 4.
  • FIG. 13 illustrates an example in which transmission / reception points are transmitted in association with a sounding reference signal and a PUSCH in a CoMP implementation using different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 14 is a diagram illustrating an example in which a sounding reference signal and a PUSCH are linked and transmitted in a situation in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • FIG. 15 illustrates an example in which only aperiodic sounding reference signals are transmitted in association with a PUSCH in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 16 illustrates an example in which only aperiodic sounding reference signals are transmitted in association with a PUSCH in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • FIG. 17 is a block diagram of a terminal transmitting an uplink SRS in FIG. 4.
  • FIG. 19 illustrates an SRS that is not frequency hopping and an SRS that is frequency hopping.
  • 20 is a flowchart illustrating a sounding reference signal transmission method according to another embodiment described above.
  • FIG. 21 illustrates an example in which physical uplink channels and sounding reference signals are independently transmitted in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 22 illustrates an example in which a physical uplink channel and a sounding reference signal are independently transmitted in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • FIG. 23 is a periodic sounding while a physical uplink channel and a sounding reference signal are independently transmitted in a CoMP implementation in which transmission and reception points use different cell IDs (Cell ID # 1, Cell ID # 2, and Cell ID # 3).
  • Cell ID # 1, Cell ID # 2, and Cell ID # 3 Cell ID # 1, Cell ID # 2, and Cell ID # 3.
  • FIG. 24 illustrates a periodic sounding reference signal and an aperiodic sounding reference signal as the physical uplink channel and the sounding reference signal are independently transmitted in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0). It is a figure which shows the example transmitted independently.
  • FIG. 25 illustrates that a periodic sounding RS signal is transmitted to a serving TX / RX point serving a UE in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2). Illustrates an example of transmitting to another transmission point.
  • FIG. 26 illustrates that a periodic sounding reference signal is transmitted to a serving transmit / receive point serving a UE in a CoMP implementation in which transmit / receive points use the same cell ID (Cell ID # 0), and the aperiodic sounding reference signal is a physical uplink channel.
  • Figure 2 shows an example of transmitting to another transmit and receive point independently.
  • FIG. 27 is a flowchart of a sounding reference signal transmission method according to another embodiment described above.
  • FIG. 28 illustrates that when a PUCCH is transmitted to a transmit / receive point instead of a serving transmit / receive point in a CoMP implementation in which transmit / receive points use different cell IDs (Cell ID # 1 and Cell ID # 2), the sounding reference signal is transmitted to the serving transmit / receive point.
  • Cell ID # 1 and Cell ID # 2 Cell ID # 1 and Cell ID # 2
  • FIG. 29 illustrates an example in which a sounding reference signal is transmitted to a serving transmission / reception point when a PUCCH is transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • Cell ID # 0 Cell ID # 0
  • FIG. 30 illustrates a sounding reference signal transmitted to a serving transmission / reception point when a PUSCH is transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • Cell ID # 1 and Cell ID # 2 A diagram illustrating an example of transmission.
  • FIG. 31 illustrates an example in which a sounding reference signal is transmitted to a serving transmission / reception point when a PUSCH is transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • Cell ID # 0 Cell ID # 0
  • FIG. 32 illustrates that a sounding reference signal is transmitted and received when a PUSCH and a PUCCH are transmitted to a transmit / receive point instead of a serving transmit / receive point in a CoMP implementation in which transmit / receive points use different cell IDs (Cell ID # 1 and Cell ID # 2). It is a figure which shows the example transmitted to a point.
  • FIG. 33 illustrates an example in which a sounding reference signal is transmitted to a serving transmission / reception point when a PUSCH and a PUCCH are transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • Figure is a diagram.
  • FIG. 34 illustrates a periodic sounding RS when a PUCCH is transmitted to a transmit / receive point instead of a serving transmit / receive point in a CoMP implementation in which transmit / receive points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • the aperiodic sounding reference signal is a diagram illustrating an example of being transmitted in association with a PUCCH.
  • FIG. 35 illustrates that a periodic sounding reference signal is aperiodic sounding to a serving transmission / reception point when a PUCCH is transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • the reference signal is a diagram illustrating an example of transmission in association with a PUCCH.
  • 36 is a diagram illustrating a transmission and reception point according to another embodiment.
  • FIG. 37 is a configuration diagram of a user terminal according to still another embodiment.
  • the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
  • the wireless communication system includes a user equipment (UE) and a transmission / reception point.
  • a user terminal is a generic concept meaning a terminal in wireless communication.
  • user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
  • a transmission / reception point generally refers to a station communicating with a user terminal, and includes a base station (BS) or a cell, a node, a node-B, an evolved node-B, and a sector. ), A site, a base transceiver system (BTS), an access point, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and an antenna.
  • BS base station
  • BS base station
  • BS base station
  • a cell a node
  • a node-B an evolved node-B
  • a sector a sector.
  • a site a base transceiver system
  • RRH remote radio head
  • RU radio unit
  • a transmission / reception point or a base station and a cell refer to a comprehensive area representing a partial area or function covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as meaning and encompasses various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, remote radio head (RRH), and radio unit (RU) communication range. to be.
  • a user terminal and a transmission / reception point are used in a generic sense as two transmission / reception entities used to implement the technology or technical idea described in the present specification, and are not limited by the terms or words specifically referred to.
  • the user terminal and the transmission and reception point is used in a comprehensive sense as two (uplink or downlink) transmission and reception subjects used to implement the technology or the technical idea described in the present invention and are not limited by the terms or words specifically referred to.
  • the uplink Uplink, UL, or uplink
  • the downlink Downlink, DL, or downlink
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-TDMA
  • UMB Universal Mobile Broadband
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.
  • Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH).
  • a data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.
  • the PDCCH is a concept including an EPDCCH.
  • a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself.
  • a transmission / reception point refers to a transmission point for transmitting a signal or a reception point for receiving a signal and a combination thereof.
  • FIG. 1 illustrates an example of a wireless communication system to which embodiments are applied.
  • a wireless communication system 100 to which embodiments are applied includes a coordinated multi-point transmission / reception system (CoMP system) or cooperative system in which two or more transmission / reception points cooperate to transmit a signal. It may be a coordinated multi-antenna transmission system, a cooperative multi-cell communication system.
  • the CoMP system 100 may include at least two transmission / reception points 110 and 112 and terminals 120 and 122.
  • the transmit / receive point is a base station or macro cell (macro cell or macro node 110, hereinafter referred to as 'eNB') and has a high transmission power or wired control connected to an eNB 110 by an optical cable or an optical fiber, or within a macro cell region. It may also be at least one pico cell 112 (hereinafter referred to as 'RRH') having a low transmission power.
  • 'eNB' macro cell or macro node 110
  • 'RRH' pico cell 112 having a low transmission power.
  • the eNB 110 and the RRH 112 may have the same cell ID or may have different cell IDs.
  • downlink means a communication or communication path from the transmission and reception points (110, 112) to the terminal 120, the uplink (uplink) from the terminal 120 to the transmission and reception points (110, 112) Or a communication path.
  • the transmitter may be part of the transmission / reception points 110 and 112 and the receiver may be part of the terminals 120 and 122.
  • the transmitter may be part of the terminal 120 and the receiver may be part of the transmission / reception points 110 and 112.
  • a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.
  • the eNB 110 which is one of the transmission and reception points 110 and 112, may perform downlink transmission to the terminals 120 and 122.
  • the eNB 110 is a downlink control information and an uplink data channel such as a physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission, and scheduling required for reception of the PDSCH.
  • a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission of a physical uplink shared channel (PUSCH) may be transmitted.
  • PUSCH physical uplink shared channel
  • the first terminal 120 and UE1 may transmit an uplink signal to the eNB 110.
  • the second terminal 122 and the UE2 may transmit an uplink signal to the RRH 112 which is one of the transmission and reception points 110 and 112.
  • the first terminal 120 may transmit an uplink signal to the RRH 112 and the second terminal 122 may transmit an uplink signal to the eNB 110.
  • the number of terminals may be two or more. However, in the following embodiment, the number of terminals is two, one terminal is an eNB 110, the other terminal will be described by way of example to transmit the uplink signal to the RRH (112).
  • DMRS demodulation reference signal
  • SRS sounding reference signal
  • RSs three reference signals (RSs) are defined in downlink, a cell-specific reference signal (CRS), and an MBSFN reference signal (Multicast / Broadcast over Single Frequency Network Reference Signal); MBSFN-RS) and UE-specific reference signal.
  • CRS cell-specific reference signal
  • MBSFN-RS Multicast / Broadcast over Single Frequency Network Reference Signal
  • a terminal transmits an uplink demodulation signal (UL DMRS or UL DM-RS) every slot in order to determine channel information for demodulation of a data channel during uplink transmission.
  • UL DMRS uplink demodulation signal
  • a reference signal is transmitted for one symbol in every slot
  • PUCCH physical uplink control channel
  • three symbols are transmitted in every slot in the case of PUCCH format 1 / 1a / 1b or two symbols in every slot in the case of PUCCH format 2 / 2a / 2b / 3.
  • FIG. 2 illustrates a general uplink / downlink data transmission method in a CoMP scenario in which transmission / reception points use different cell IDs and in a heterogeneous network.
  • the wireless communication system 100 to which the embodiments are applied is a CoMP scenario in which the eNB 110 and the RRH 112 have different cell IDs, and a CoMP system implementing heterogeneous networks. Can be.
  • FIG. 3 illustrates a method for transmitting uplink / downlink data in a CoMP scenario in which transmission / reception points use the same cell ID.
  • CoMP in which the eNB 110 and the RRHs 112a, 112b, 112c, 112d, 112e, and 112f have a CoMP scenario having the same cell ID is implemented. It may be a system.
  • parameters for generating a reference signal transmitted by the terminal in the wireless communication system 100 for example, sequence group index and sequence
  • the terminal receives the index, the cyclic shift index, and the orthogonal cover code (OCC) index information from the eNB 110 as a transmission / reception point to which the corresponding terminal belongs, for example, a serving transmission / reception point.
  • OCC orthogonal cover code
  • the eNB 110 1) informs the UE of the sequence group index and the sequence index according to the configuration of the sequence group hopping and the sequence hopping set to the cell ID and the RRC set to perform the division of the eNB 110. It is.
  • the eNB 110 is 2) a PDCCH for an uplink grant transmitted through the downlink, for example, a cyclic shift for generating a reference signal to be transmitted by the terminal 120a through DCI format 0 and DCI format 4. Index, OCC index will be informed.
  • the UE generates an uplink DM-RS and transmits the uplink DM-RS and the PUSCH together to an arbitrary eNB 110.
  • parameters for generating an SRS transmitted by the UE from an arbitrary transmission point or an arbitrary cell in the wireless communication system 100 for example, a cell-specific SRS band of the SRS. bandwidth), transmission comb (frequency positioning assigned at two subcarrier spacing intervals, e.g., 0 (even subcarriers) or 1 (odd subcarriers)), UE-specific SRS band (UE- specific SRS bandwidth, hopping related configuration parameters, frequency domain position, period, subframe configuration (specify which subframe should transmit SRS), antenna configuration (for antennas transmitting SRS) Number of antenna ports, base sequence index (the SRS sequence index for generating the corresponding SRS is determined by the sequence group number u used in the PUCCH and the sequence hopping configuration.
  • the cyclic shift index (the cyclic shift index as a reference signal used when generating the SRS), etc., are transmitted and received by the corresponding transmission / reception point to the terminal 120a as an RRC parameter, and the terminal 120a transmits the corresponding information. It receives the uplink SRS.
  • aperiodic SRS is defined along with periodic SRS. Similar to the periodic SRS, the corresponding aperiodic SRS is a parameter for generating an aperiodic SRS transmitted by the terminal as used in the wireless communication system 100, for example, various parameters used for generating the aperiodic SRS. Any transmit / receive point transmits UE-specific SRS band, transmit comb, frequency domain position, period, subframe configuration, antenna configuration, base sequence index, cyclic shift index, etc. of aperiodic SRS to UE 120a as an RRC parameter. do.
  • any transmission / reception point dynamically triggers the transmission of the aperiodic SRS through the PDCCH to the terminal 120a, and the terminal 120a receives the triggering by the PDCCH and the RRC parameters to uplink.
  • Aperiodic SRS will be transmitted.
  • a reference signal transmitted by a terminal belonging to an arbitrary transmission / reception point can receive a reference signal transmitted by the terminal 120a only at the transmission / reception point, and any other transmission / reception
  • the corresponding reference signal cannot be received.
  • the reception does not mean that the reference signal is received by interference, but that the reference signal is a desired signal and is received according to the purpose of a signal transmitted by the terminal.
  • the UE that receives the parameter transmitted from any transmission / reception point generates reference signals based on the parameters transmitted from the transmission / reception point at the time of generation of uplink DM-RS and periodic / aperiodic SRS. Only transmission from uplink to downlink and linked uplink is possible, and downlink and uplink without linkage may be impossible.
  • the terminal 120a belonging to the transmission / reception point that is, the terminal 120a receiving the downlink control channel through the transmission / reception point does not perform uplink data transmission to the transmission / reception point, and the channel quality and geometry of the uplink is higher than the transmission / reception point. geometry may not support transmission to other send / receive points better.
  • a terminal 120a belonging to an arbitrary transmission point that is, a terminal 120a receiving a downlink control channel through the corresponding transmission point to another transmission point having better uplink channel quality and geometry than the transmission point.
  • a method for configuring transmission support and a method and apparatus for distinguishing a channel transmitted to different transmission / reception points are provided.
  • the present invention is an uplink channel (for example, PUSCH, PUCCH, SRS, uplink-related RS) and the transmission and reception point other than the transmission and reception point that the terminal belonging to any transmission and reception point to the corresponding transmission and reception point
  • the division of the corresponding channels may be a division for the same channel type (ie, a division between SRSs, PUSCHs, PUCCHs, and related RSs), and a division for different channel types (ie, SRS and PUSCHs, PUCCH). And division between PUSCHs and PUCCHs and SRSs).
  • sequence group index and sequence index used for periodic and aperiodic SRS are each defined from the sequence group index (u) used in PUCCH and the sequence index (v) defined in sequence hopping used in PUSCH, respectively.
  • the present invention provides a method and apparatus for setting the sequence group index u and the sequence index v used in periodic and aperiodic SRS in different ways.
  • the uplink reference signal may be an uplink demodulation reference signal for demodulation of a physical uplink channel
  • the physical uplink channel may include at least one of a physical uplink data channel (PUSCH) and a physical uplink control channel (PUCCH). It can be one.
  • PUSCH physical uplink data channel
  • PUCCH physical uplink control channel
  • FIG. 4 is a flowchart illustrating a method of transmitting an uplink reference signal of a terminal according to an embodiment.
  • a method for transmitting an uplink reference signal by a terminal includes a physical cell ID of one transmit / receive point 110 from one transmit / receive point 110 among two or more different transmit / receive points.
  • an uplink reference signal is generated from an uplink reference signal ID independent of a physical cell ID of a transmission / reception point for transmitting a downlink channel to the user equipment.
  • the transmission target of the link reference signal may be set to a transmission / reception point 112 other than the transmission / reception point 110 transmitting the downlink channel.
  • the transmission target of the uplink reference signal may be a transmission / reception point 110 for transmitting a downlink channel.
  • a sounding reference signal when generating an uplink reference signal from an independent uplink reference signal ID, a sounding reference signal may also be generated from the same uplink reference signal ID.
  • the sounding reference signal may be at least one of a periodic sounding reference signal (periodic SRS) and an aperiodic sounding reference signal (aperiodic SRS).
  • periodic SRS periodic sounding reference signal
  • aperiodic SRS aperiodic sounding reference signal
  • a transmission target of a physical uplink channel may be variously changed.
  • a periodic or aperiodic sounding reference signal may be transmitted in association with a physical uplink, that is, a PUCCH or a PUSCH.
  • a physical uplink that is, a PUCCH or a PUSCH.
  • the first embodiment refers to an embodiment in which the physical uplink channel is PUCCH, that is, the sounding reference signal is transmitted in association with the PUCCH
  • the second embodiment is a case in which the physical uplink channel is PUSCH, that is, sounding.
  • a reference signal is transmitted in association with a PUSCH.
  • FIG. 5 is a flowchart of a sounding reference signal transmission method when the physical uplink channel is PUCCH in the sounding reference signal transmission method shown in FIG. 4.
  • the SRS transmission method illustrated in FIG. 5 transmits an SRS in association with an uplink reference signal.
  • the flowchart illustrated in FIG. 5 includes a process of transmitting an uplink reference signal shown in FIG. 4 and a physical uplink channel related thereto. have.
  • an uplink associated with a PUCCH is independent of a cell ID of one transmission / reception point from one transmission / reception point among two or more different transmission / reception points.
  • Receiving terminal-specific configuration information indicating a reference signal ID (S510) generating all or part of a sounding reference signal using the uplink reference signal ID (S520), Transmitting the reference signal associated with the PUCCH to the transmission and reception point 112 indicated by the uplink reference signal ID (S530), Transmitting the PUCCH to the transmission and reception point 112 indicated by the uplink reference signal ID (S540). And transmitting the generated sounding reference signal to the transmission / reception point 112 indicated by the uplink reference signal ID (S550).
  • steps S530 and S540 may occur simultaneously.
  • the sounding RS and the PUCCH may be simultaneously transmitted in one subframe.
  • the PUCCH and the SRS may be uplink transmitted to the same target transmission / reception point by following the configuration of a sequence used in the PUCCH and the reference signal associated with the PUCCH with respect to the periodic sounding reference signal.
  • FIG. 6 to 11 illustrate various embodiments in which all or part of a sounding reference signal is transmitted in association with a PUCCH by the sounding reference signal transmission method shown in FIG. 5.
  • FIG. 6 illustrates an example in which all uplink-related channels are transmitted to transmit / receive points different from the transmit / receive points to which the UE belongs in a CoMP implementation in which transmit / receive points use different cell IDs (Cell ID # 1 and Cell ID # 2). One drawing.
  • FIG. 7 illustrates an example in which all uplink-related channels are transmitted to transmit / receive points different from the transmit / receive points to which the UE belongs in a CoMP implementation in which transmit / receive points use the same cell ID (Cell ID # 0).
  • both a PUCCH and a PUSCH are transmitted / received points to which the UE 120 belongs, for example, an eNB 110 (hereinafter identical).
  • the sounding reference signal of the terminal 120 may also be transmitted together with the above-described PUCCH and PUSCH when transmitted to a transmission / reception point having better geometry and channel quality, for example, RRH (same as below).
  • the transmission / reception point 110 may be transmitted to another transmission / reception point 112 other than the transmission / reception point 110, and as a result, all uplink channels may be transmitted to the other transmission / reception point 112.
  • FIG. 8 illustrates an example in which transmission and reception points are transmitted in association with a sounding reference signal and a PUCCH in a CoMP implementation using different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 9 is a diagram illustrating an example in which a sounding reference signal and a PUCCH are transmitted in association with a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • a downlink control channel (PDCCH) and a data channel (PDSCH) are received from a transmit / receive point 110 to which a corresponding UE 120 belongs, and an uplink data channel (PUSCH) corresponds to a corresponding UE.
  • the uplink control channel (PUCCH) and SRS, which transmits to the transmit / receive point 110 and transmits Ack / Nak and channel state information for downlink transmission among uplink channels, is different from the transmit / receive point 110 to which the terminal belongs. May be sent to point 112.
  • FIG. 10 illustrates an example in which only aperiodic sounding reference signals are transmitted in association with a PUCCH in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 11 illustrates an example in which only aperiodic sounding reference signals are transmitted in association with a PUCCH in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • a downlink control channel (PDCCH) and a data channel (PDSCH) are received from a transmit / receive point 110 to which a corresponding UE 120 belongs, and an uplink data channel (PUSCH) and a periodic SRS are UEs.
  • the uplink control channel (PUCCH) and aperiodic sounding signal are transmitted to the corresponding transmission / reception point 110 to which the 120 belongs, and transmits Ack / Nak and channel state information for downlink transmission among uplink channels.
  • the transmission and reception points 110 to which the 120 belongs may be different from the transmission and reception points 112.
  • the method of transmitting a sounding reference signal illustrated in FIG. 5 includes generating and transmitting an uplink reference signal illustrated in FIG. 4.
  • the following descriptions refer to independent transmission of an uplink reference signal as well as a method of transmitting a sounding reference signal. It also includes a description of how to generate and transmit the signal ID.
  • the eNB 110 which is one of the transmission and reception points, transmits UE-specific configuration information to the UE 120 belonging to the eNB 110 (S510).
  • terminal 120 receives the terminal-specific configuration information.
  • the terminal-specific configuration information includes a terminal-specific parameter for terminal-specifically setting the terminal 120 belonging to the eNB 110.
  • the UE-specific configuration information may include a UE-specific reference signal ID associated with a PUCCH that sets a PUCCH sequence and a reference signal sequence associated with the PUCCH.
  • VCID virtual cell ID
  • Reference ID associated with PUCCH Terminal-specific parameters indicating the cell ID (cell ID) of the cell to which the terminal 110 belongs ( ) May be distinguished from the cell-specific parameter indicating.
  • the eNB 110 sends a reference signal ID associated with the PUCCH to the UE 120 ( UE-specific configuration information including the UE-specific parameters indicating) is dynamically transmitted through PDCCH / EPDCCH, semi-statically set through an upper layer, for example, RRC, or pre-set to RRC, and then used for the setting. Whether or not may be indicated through PDCCH / EPDCCH.
  • the terminal 120 is a reference signal ID associated with the PUCCH ( Reference signal associated with PUCCH, for example, a base sequence of a DM-RS, ) This base sequence is generated differently by the sequence group number u and the base sequence number v in the group. To determine the sequence group number u and the base sequence number v in the group, the cell ID ( Instead of the reference ID associated with the PUCCH ( ) Can be used.
  • the terminal 120 is the reference signal ID associated with the PUCCH ( SRS is generated using the terminal-specific configuration information, including (S520).
  • the terminal 120 allocates the DM-RS generated by the base sequence, the cyclic shift, the orthogonal code (or the orthogonal cover code), to the allocated radio resource, and uses the reference signal ID associated with the PUCCH ( ) Transmits and receives a transmission point, for example, to the RRH 112 (S530).
  • the terminal 120 transmits an uplink DM-RS for up to three symbols in each slot.
  • the terminal 120 transmits the PUCCH in the same frequency band as the band allocated for the uplink DM-RS associated with the PUCCH (S540).
  • the RRH 112 which is a transmission and reception point capable of receiving the DM-RS can receive the PUCCH using the received DM-RS.
  • the base sequence is generated differently by the sequence group number u, the base sequence number v in the group, and n, the length of the sequence.
  • the sequence group number u in slot n s is determined by the equation (3) below by a group hopping pattern f gh (n s) and the sequence shift pattern f ss.
  • PUCCH and PUSCH are the same sequence group hopping pattern But with different sequence shift patterns Can have
  • the terminal-specific configuration information In each radio frame Is initialized to
  • Sequence shift pattern The definition of may vary between PUCCH and PUSCH.
  • the sequence shift pattern for PUCCH is Given by
  • Equation 5 The base sequence number v in the base sequence group of the slot n s for the reference signals is given by Equation 5 below.
  • Cyclic shift value Equation 6 may be generated differently for each terminal and antenna port.
  • Is used to calculate the cyclic shift value For each terminal, a total of eight values of 0 to 7 ⁇ 0,1,2,3,4,5,6,7 ⁇ are transmitted through higher layer signaling (eg, RRC), and for each antenna port.
  • the cyclic shift value is transmitted as shown in equation (6). Determined based on the value.
  • step S520 Equation 1 The base sequence of Equation 2 and Equation 6 in step S520 Equation 1 is applied to (cyclic shift value, CS) to generate an SRS sequence.
  • Step S520 of generating the SRS sequence is performed by the OFDM modulator 1710 of FIG. 17.
  • the terminal 120 allocates the SRS generated in step S520 to radio resources This transmission and reception point, for example, is transmitted to the RRH 112 (S550).
  • step S550 the DM-RS sequence generated by Equation 1 is mapped to a corresponding symbol of a subframe. Operation S550 is performed through the resource element mapper 1720 of FIG. 17.
  • 18 shows the position of a symbol in which an SRS is transmitted.
  • 19 illustrates an SRS that is not frequency hopping and an SRS that is frequency hopping.
  • the SRS is transmitted in the last symbol of the subframe.
  • SRS transmission in the frequency domain should cover the frequency band of interest for frequency domain scheduling.
  • a single SRS transmission allows wide enough SRS transmission to estimate channel quality for the entire frequency band of interest.
  • SRS transmissions may be combined to cover the entire frequency band of interest.
  • an SC-FDMA symbol is generated through an SC FDMA generator (not shown in FIG. 17) to transmit an SRS signal to a transmission / reception point.
  • the specific subframe in which the SRS is transmitted may be set periodically or aperiodicly.
  • cell-specific SRS transmission as defined in Table 1 (Frequency Division Duplex (FDD)) or Table 2 (Time Division Duplex (TDD)) below.
  • the SRS may be periodically transmitted in a subframe having a specific period and offset for each terminal.
  • Such an SRS may be called a periodic SRS or a trigger type 0 SRS.
  • the SRS may be transmitted in a specific subframe that is set aperiodically.
  • Such an SRS may be referred to as an aperiodic SRS or trigger type 1 SRS.
  • Tables 1 and 2 represent cell-specific SRS transmittable subframes defined in FDD (frame structure type 1) and TDD (frame structure type 2), respectively, in period (T SFC ) and offset ( ⁇ SFC ).
  • T SFC period
  • ⁇ SFC offset
  • Tables 1 and 2 represent cell-specific SRS transmittable subframes defined in FDD (frame structure type 1) and TDD (frame structure type 2), respectively, in period (T SFC ) and offset ( ⁇ SFC ).
  • T SFC period
  • ⁇ SFC offset
  • the periodic SRS refers to an SRS periodically transmitted to a corresponding subframe with a specific period and offset for each UE among the cell-specific SRS transmittable subframes.
  • Table 3 (FDD) and Table 4 (TDD) are tables showing specific periods and offsets of periodic SRS defined for each UE.
  • Tables 3 and 4 represent subframes in which periodic SRSs specified for UEs defined in FDD and TDD are transmitted in a period (T SRS ) and an offset (T offset ), respectively, and the total number of possible cases is 1024. It may be sent in 10-bit higher layer signaling (eg, RRC signaling). For example, in Table 3, if the I SRS value is 3, the period (T SRS ) is 5 and the offset (T offset ) is 1, which means that the periodic SRS for the UE in the second subframe is determined based on 5 subframe units. Will be sent.
  • the cell-specific number of total resource blocks used is signaled.
  • the resource blocks used are specific resource blocks corresponding to the number signaled among the resource blocks corresponding to the overall system bandwidth (BW). For example, if the system bandwidth is 50 resource blocks and the number of resource blocks signaled is 48, then 48 resource blocks are used among the total 50 resource blocks. Subsequently, among the cell-specific resource blocks used, the number and location of resource blocks used for each UE are signaled.
  • Table 5 is a table used when the system bandwidth is 40 to 60 resource blocks.
  • the total number of cell-specific resource blocks used may be transmitted as a parameter value called C SRS .
  • the number of resource blocks used for each UE among cell-specific resource blocks may be defined by a parameter called B SRS .
  • B SRS the number of cell-specific resource blocks (m SRS, 0 ) used for total SRS transmission is 48 resource blocks used for a specific UE.
  • the number of m (S SRS, 2 ) is eight.
  • a parameter called n RRC may be defined to represent the location of the resource block used for each terminal.
  • the transmission comb (k TC ) value which is information on the subcarrier to which the SRS is allocated, is 0 or 1, and the even number of subcarriers to which the SRS sequence is substantially mapped is transmitted for the above-described SRS transmission subframe and the SRS transmission resource block. It is indicated whether the first subcarrier is an even subcarrier or every odd subcarrier. This may also be transmitted by higher layer signaling (eg, RRC signaling) for each terminal.
  • higher layer signaling eg, RRC signaling
  • C SRS which is a parameter for determining a resource block in which srs-SubframeConfig, I SRS and SRS are transmitted, is a parameter for determining a subframe in which the SRS is transmitted.
  • B SRS , n RRC , k TC which is a parameter for determining the subcarrier to which SRS is allocated, and a parameter for determining the cyclic shift of SRS.
  • the number of, and antenna ports may be delivered from the transmitter to the terminal through higher layer signaling such as RRC signaling. This is summarized in Table 6 below.
  • the SRS may be transmitted in a specific subframe in which a SRS is set aperiodically, and may be referred to as an aperiodic SRS or a trigger type 1 SRS. .
  • the SRS has a specific period and offset defined for each UE as shown in Table 7 (FDD) or Table 8 (TDD) among the cell-specific SRS transmittable subframes set in Table 1 or Table 2. It is periodically transmitted in a specific subframe.
  • the non-periodic transmission means pre-specifying some configurable cases and triggering SRS transmission through dynamic signaling such as DCI whenever necessary.
  • various signaling information for SRS transmission for example, information on an SRS transmission subframe, information on an SRS transmission resource block, and an SRS allocation subcarrier
  • Information information on a cyclic shift value used when generating an SRS sequence, information on the number of SRS transmit antennas, etc.
  • RRC signaling higher layer signaling
  • some of the signaling information for SRS transmission are not directly transmitted, but only in some cases through higher layer signaling (RRC signaling). set), and only when SRS transmission is necessary, only a value indicating this parameter set is transmitted through dynamic signaling such as DCI.
  • the parameters included in the parameter set are I SRS , which is a parameter used to determine the SRS transmission subframe, and B SRS , n RRC , which is a parameter used to determine the SRS transmission resource block.
  • K TC is a parameter used to determine the subcarrier to which the SRS is assigned, and k TC is a parameter used to determine the cyclic shift of the SRS.
  • antenna port numbers are included in the above-described parameter set. This is summarized in Table 9 below.
  • a signal for triggering an aperiodic SRS is 1 bit, and a value transmitted through this may be as shown in Table 10 below.
  • the signal for triggering the aperiodic SRS is 2 bits, and a value transmitted through this may be as shown in Table 11 below.
  • aperiodic SRS or type 1 SRS is not transmitted, and if the value of the SRS request field is '01', '10' or '11'.
  • Aperiodic SRS or Type 1 SRS is transmitted according to a parameter by one of a parameter set configured through higher layer signaling (RRC signaling).
  • the serving transmission and reception points are not transmitted through the periodic and aperiodic SRS in connection with the PUCCH.
  • channel quality measurement for the downlink of the serving transmit / receive point and other transmit / receive points may be independently performed.
  • by identifying the position of the terminal or the geometry of the terminal using the SRS to allow the terminal to use the terminal-specific downlink transmission method for the downlink transmission according to the cell boundary or the center of the cell It can also be used to improve data throughput.
  • the reception point for the PUCCH when the reception point for the PUCCH is set to a transmission / reception point other than the serving transmission / reception point, that is, when generating a sequence for transmitting the PUCCH and PUCCH reference signals, the UE-specific PUCCH sequence and the PUCCH reference are referred to. It has been described that uplink transmission of the SRS without distinction between the periodic SRS and the non-periodic SRS is performed by setting the signal sequence. However, the first embodiment may transmit only aperiodic SRS in association with the PUCCH as described above with reference to FIGS. 10 and 11.
  • the periodic SRS and the non-periodic SRS are distinguished so that the periodic SRS is transmitted through the serving transmitting / receiving point serving the UE, and for the aperiodic SRS, the PUCCH and the aperiodic SRS are followed by setting the sequence used in the PUCCH. Uplink transmission may be possible to the same target transmission / reception point.
  • the periodic SRS in Equation 1 to 6 serving transmission and reception point for example, the cell ID of the eNB 110 ( ) To generate the SRS and transmit the generated SRS to the serving transmission / reception point.
  • the terminal uses a specific downlink transmission method for downlink transmission according to the position of the terminal at the cell boundary or the cell center. It can also be used to improve data throughput.
  • the non-periodic SRS is transmitted through the serving transmission / reception point serving the UE, and the periodic SRS is followed by the configuration of the sequence used in the PUCCH so that the PUCCH and the periodic SRS are the same target transmission / reception points.
  • Uplink transmission may be possible.
  • the sounding reference signal transmission method illustrated in FIG. 12 includes each step of the uplink reference signal transmission method illustrated in FIG. 4.
  • a sounding reference signal transmission method may include a PUSCH independent of a cell ID of one transmission / reception point 110 from one transmission / reception point 110 among two or more different transmission / reception points.
  • step S1230 and step S1240 may occur simultaneously.
  • the sounding RS and the PUSCH may be simultaneously transmitted in one subframe, and both the sounding RS and the PUSCH and the PUC
  • the periodic SRS may be configured to follow the configuration of the sequence used in the PUSCH and the reference signal associated with the PUSCH so that the PUSCH and the SRS are uplink transmitted to the same target transmission / reception point.
  • the reception targets of the PUSCH and the periodic or aperiodic SRS are the same. If the reception targets of the PUSCH and the PUCCH are the same, an example in which the SRS illustrated with reference to FIGS. The same may be applied to the second embodiment.
  • FIGS. 6 and 7 are various terms in which a periodic or aperiodic SRS of a sounding reference signal is transmitted in association with a PUSCH by the sounding reference signal transmission method shown in FIG. 12 in addition to the cases illustrated in FIGS. 6 and 7. It is a figure which shows an Example.
  • FIG. 13 is a diagram illustrating an example in which transmission and reception points are transmitted in association with a sounding reference signal and a PUSCH in a CoMP implementation using different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 14 is a diagram illustrating an example in which a sounding reference signal and a PUSCH are linked and transmitted in a situation in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • a downlink control channel (PDCCH) and a data channel (PDSCH) are received from a transmission / reception point 110 to which a corresponding UE 120 belongs, and Ack / Nak for downlink transmission among uplink channels.
  • an uplink control channel (PUCCH) for transmitting channel state information, etc., to a corresponding transmit / receive point 110 to which a terminal belongs, and uplink data channel (PUSCH) and SRS are different transmit / receive points from the transmit / receive point 110 to which a terminal belongs.
  • PUCCH uplink control channel
  • PUSCH uplink data channel
  • FIG. 15 illustrates an example in which only aperiodic sounding reference signals are transmitted in association with a PUSCH in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 16 illustrates an example in which only aperiodic sounding reference signals are transmitted in association with a PUSCH in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • a downlink control channel (PDCCH) and a data channel (PDSCH) are received from a transmission / reception point 110 to which a corresponding UE 120 belongs, and Ack / Nak for downlink transmission among uplink channels.
  • uplink control channel (PUCCH) and periodic SRS for transmitting channel state information and the like to the corresponding transmit / receive point 110 to which the terminal 120 belongs, and uplink data channel (PUSCH) and aperiodic sounding signal to the terminal ( 120 may be transmitted to a transmit / receive point 112 different from the transmit / receive point 110 to which it belongs.
  • each step of the sounding reference signal transmission method shown in FIG. 12 will be described in detail with reference to a case where both the periodic and aperiodic sounding reference signals shown in FIGS. 13 and 14 are associated with a PUSCH.
  • portions overlapping with portions describing the first embodiment may be omitted or described relatively briefly.
  • the eNB 110 which is one of the transmission and reception points, transmits UE-specific configuration information to the UE 120 belonging to the eNB 110 (S1210).
  • the terminal 120 receives the terminal-specific configuration information.
  • the terminal-specific configuration information includes a terminal-specific parameter for terminal-specifically setting the terminal 120 belonging to the eNB 110.
  • the UE-specific configuration information may include a UE-specific parameter indicating a PUSCH sequence and a reference signal ID associated with a PUSCH that sets a reference signal sequence associated with the PUSCH.
  • the UE-specific parameter indicating the reference signal ID associated with the PUSCH is a cell ID of a cell to which the UE 110 belongs. ) May be distinguished from the cell-specific parameter indicating.
  • the UE-specific configuration information includes a reference signal ID associated with a PUCCH that sets a UE-specific PUCCH sequence and a reference signal sequence associated with a PUCCH. ) May include a terminal-specific parameter.
  • the PUSCH and the PUCCH may be uplink transmitted to the same transmission / reception point, but the PUSCH and the PUCCH may be uplink transmission to different transmission / reception points.
  • the reference signal ID associated with the PUSCH and the reference signal ID associated with the PUCCH In the latter case, the reference signal ID associated with the PUSCH and the reference signal ID associated with the PUCCH may be different. Since the PUSCH transmission and the PUCCH transmission may be independent from each other, in the second embodiment, the reference signal ID associated with the PUSCH is determined. To be displayed.
  • independent means “independent” that an uplink reference signal ID specifies a transmitting / receiving point independently of a cell ID (separately) or may be the same as or different from a cell ID. It means to be.
  • the eNB 110 sends a reference signal ID associated with the PUSCH to the UE 120 ( Terminal-specific configuration information including the terminal-specific configuration information indicating) is dynamically transmitted through PDCCH / EPDCCH, semi-statically set through an upper layer, for example, RRC, or previously set to RRC, Whether or not to use may be indicated through PDCCH / EPDCCH.
  • Terminal-specific configuration information including the terminal-specific configuration information indicating is dynamically transmitted through PDCCH / EPDCCH, semi-statically set through an upper layer, for example, RRC, or previously set to RRC, Whether or not to use may be indicated through PDCCH / EPDCCH.
  • Terminal 120 is a reference signal ID associated with the PUSCH ( A reference signal associated with a PUSCH, for example, a base sequence of a DM-RS, using UE-specific configuration information, including ) This base sequence is generated differently by the sequence group number u and the base sequence number v in the group.
  • the cell ID of the serving cell instead of the reference ID associated with the PUSCH ( ) Can be used.
  • the terminal 120 is the reference signal ID associated with the PUSCH ( SRS is generated using the terminal-specific configuration information, including (S1220).
  • SRS is generated using the terminal-specific configuration information, including (S1220).
  • the reference signal ID associated with the PUSCH in Equations 1 to 6 ( ) Is substantially the same as step S520 of the first embodiment described with reference to FIG.
  • the terminal 120 allocates the DM-RS generated by the base sequence, the cyclic shift, the orthogonal code (or the orthogonal cover code), to the allocated radio resource, and uses the reference signal ID associated with the PUSCH ( ) Transmits and receives a transmission point, for example, to the RRH 112 (S1230). In case of the uplink DM-RS associated with the PUSCH, the terminal 120 transmits an uplink DM-RS for one symbol in every slot.
  • the terminal 120 transmits the PUSCH in the same band as the frequency band allocated for the DM-RS associated with the PUSCH (S1240).
  • step S1220 SRS sequence is generated by Equation 1 in (cyclic shift value, CS).
  • Step S1220 of generating the SRS sequence is performed by the OFDM modulator 1710 of FIG. 17.
  • the terminal 120 allocates the SRS generated in step S1240 to a radio resource This transmission and reception point, for example, is transmitted to the RRH 112 (S1250).
  • step S1250 the DM-RS sequence generated by Equation 1 is mapped to a corresponding symbol of a subframe. Operation S1250 is performed through the resource element mapper 1720 of FIG. 17.
  • the SRS is transmitted in the last symbol of the subframe.
  • a single SRS transmission allows the SRS transmissions to be aggregated to cover the entire frequency band of interest, either by making SRS transmission wide enough to estimate the channel quality for the entire frequency band of interest or by hopping narrowband SRS in the frequency domain. It may be.
  • an SC-FDMA symbol is generated through an SC FDMA generator (not shown in FIG. 17) to transmit the SRS signal to a transmission / reception point.
  • the reception point for the PUSCH is set to a transmission / reception point other than the serving transmission / reception point, that is, when generating a sequence for transmitting the PUSCH and the PUSCH reference signal
  • the UE-specific PUSCH sequence and the PUSCH reference It has been described that uplink transmission of the SRS without distinction between the periodic SRS and the non-periodic SRS is performed by setting the signal sequence.
  • only aperiodic SRS may be transmitted in association with a PUSCH.
  • the periodic SRS and the non-periodic SRS are distinguished so that the periodic SRS is transmitted through the serving transmission / reception point serving the UE, and for the non-periodic SRS, the PUSCH and the aperiodic SRS are configured to follow the configuration of the sequence used by the PUSCH.
  • Uplink transmission may be possible to the same target transmission / reception point.
  • the reference signal ID associated with the PUSCH in Equations 1 to 6 when aperiodic SRS is generated To generate the SRS, and the reference signal ID associated with the PUSCH ( ) Transmits and receives a transmission point, for example, the SRS generated by the RRH 112.
  • the periodic SRS in Equation 1 to 6 serving transmission and reception point for example, the cell ID of the eNB (110)
  • To generate an SRS and transmit the generated SRS to a serving transmission / reception point.
  • the non-periodic SRS is transmitted through the serving transmission / reception point serving the UE, and for the periodic SRS, the setting of the sequence used by the PUSCH is performed so that the PUSCH and the periodic SRS are the same target transmission / reception points. Uplink transmission may be possible.
  • a reception point when a reception point is set to a transmission / reception point other than a serving transmission / reception point, it is used in a reference signal associated with PUCCH and PUCCH during periodic or aperiodic SRS transmission.
  • a reference signal associated with PUCCH and PUCCH during periodic or aperiodic SRS transmission.
  • the present invention is not limited thereto.
  • the sequence group index of the SRS sequence for generating the corresponding SRS and the cell ID of the serving cell when the sequence index is generated for transmission of the aperiodic or periodic SRS Rather than being derived from a PUCCH sequence group index or a PUSCH sequence index based on the MSC, a sequence independent of the corresponding PUCCH and PUSCH sequences may be generated.
  • the SRS sequences may be additionally included in the RRC configuration parameter or may be dynamically indicated through a PDCCH transmitted dynamically or a predefined parameter through the RRC parameter using one bit through the PDCCH.
  • a PUSCH and a reference signal associated with a PUSCH, a PUCCH, and a reference signal associated with a PUCCH are each independently generated, and a sequence independent of the PUCCH and the PUSCH sequence may be generated as an SRS sequence and may be transmitted uplink to a transmit / receive point independently of them.
  • the UE performs a procedure for detecting a corresponding UL grant during blind decoding of a downlink control channel, that is, a PDCCH as follows. .
  • the UE searches for the PDCCH in common search space ( The UE performs an operation to search for DCI format 0 and DCI format 4, which are uplink grants containing uplink scheduling information for the corresponding UE, in a UE-dedicated search space instead of the UE common search space.
  • the terminal may be configured to always search for an uplink grant containing related uplink scheduling information in the UE-specific search space when performing the related operation.
  • 20 is a flowchart illustrating a sounding reference signal transmission method according to another embodiment described above.
  • the sounding reference signal transmission method may be configured independently from an uplink reference signal ID for a physical uplink channel from one transmit / receive point among two or more different transmit / receive points.
  • an uplink reference signal ID for a physical uplink channel and an uplink reference signal ID for a sounding reference signal are independently configured, and thus a reception target of the physical uplink channel is performed.
  • the reception target of the sounding reference signal may vary.
  • the physical uplink may be at least one of a physical uplink data channel (hereinafter referred to as PUSCH) and a physical uplink control channel (hereinafter referred to as PUCCH).
  • PUSCH physical uplink data channel
  • PUCCH physical uplink control channel
  • the sounding reference signal may be at least one of a periodic sounding reference signal (periodic SRS) and an aperiodic sounding reference signal (aperiodic SRS).
  • periodic SRS periodic sounding reference signal
  • aperiodic SRS aperiodic sounding reference signal
  • FIG. 21 illustrates an example in which physical uplink channels and sounding reference signals are independently transmitted in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • FIG. 22 illustrates an example in which a physical uplink channel and a sounding reference signal are independently transmitted in a CoMP implementation in which transmission and reception points use the same cell ID (Cell ID # 0).
  • the receiving target of the physical uplink channel and the sounding reference signal are independent. It can be set to be transmitted to different destinations.
  • the receiving target of the sounding reference signal and the receiving target of the physical uplink channel are not necessarily different, and the two receiving targets may be the same. That is, each destination may be set independently.
  • the sequence of the sounding reference signal can be set independently from the DM-RS associated with the PUCCH and the PUSCH, thereby enabling the uplink of the serving transmission / reception point and other transmission / reception points.
  • quality measurement for a downlink of a serving transmission point and another transmission point may be independently performed.
  • by identifying the location of the terminal using the sounding reference signal or the geometry of the terminal (geometry) by allowing the terminal to use the terminal-specific downlink transmission method for downlink transmission according to the cell boundary or located in the center of the cell It can also be used to improve the data throughput for a link.
  • the receiving target of the periodic and aperiodic sounding reference signals is set identically. That is, the terminal-specific parameter indicating the sounding reference signal ID may indicate the same reference signal ID for the periodic sounding reference signal and the aperiodic sounding reference signal.
  • the sounding reference signal IDs for each of them may be independent of each other.
  • the periodic sounding reference signal ID ( ) To generate a sounding reference signal Transmits the sounding reference signal generated to the transmission / reception point indicated by the ) Is independent of the aperiodic sounding reference ID ( ) To generate a sounding reference signal,
  • the sounding reference signal generated by the transmission / reception point indicated by may be transmitted. sure Wow May be specified independently of each other, it is not necessary to specify only the transmission and reception point and the other transmission and reception point, and may also indicate a serving transmission and reception point, for example, eNB (110).
  • a sequence for a sounding reference signal independently of the PUCCH and the PUSCH, and to set an independent sequence for a periodic sounding reference signal and an aperiodic sounding reference signal, thereby serving serving transmission / reception points and other transmission / reception.
  • channel quality measurement for a downlink of a serving transmission point and another transmission point may be independently performed.
  • the terminal specific downlink transmission method for the downlink transmission according to the terminal located in the cell boundary or cell center can also be used to improve the data throughput for a link.
  • FIG. 23 is a periodic sounding while a physical uplink channel and a sounding reference signal are independently transmitted in a CoMP implementation in which transmission and reception points use different cell IDs (Cell ID # 1, Cell ID # 2, and Cell ID # 3). A reference signal and an aperiodic sounding reference signal are also shown to be transmitted independently.
  • FIG. 24 illustrates a periodic sounding reference signal and an aperiodic sounding reference signal as the physical uplink channel and the sounding reference signal are independently transmitted in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0). It is a diagram showing that the transmission independently.
  • the UE-specific parameter indicating the sounding reference signal indicates different reference signal IDs for the periodic sounding reference signal and the non-periodic sounding reference signal. Therefore, the sounding reference signal is transmitted independently of the PUCCH and the PUSCH, and the transmission of the periodic sounding reference signal and the aperiodic sounding reference signal is performed independently. 23 and 24 illustrate only the case where the transmission targets of the periodic sounding reference signal and the aperiodic sounding reference signal are different, but if each transmission target is set independently, this includes the case where the two transmission targets are the same. .
  • a sequence setting for the sounding reference signal can be independently performed, and the periodic sounding reference signal and By allowing independent sequences to be set for aperiodic sounding reference signals, TDD systems that use uplink channel quality measurement and channel reversibility for serving transmit / receive points and other transmit / receive points may be used for Channel quality measurements can be performed independently.
  • FIG. 25 illustrates that a periodic sounding RS signal is transmitted to a serving TX / RX point serving a UE in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2). Illustrates an example of transmitting to another transmission point.
  • FIG. 26 illustrates that a periodic sounding reference signal is transmitted to a serving transmit / receive point serving a UE in a CoMP implementation in which transmit / receive points use the same cell ID (Cell ID # 0), and the aperiodic sounding reference signal is a physical uplink channel.
  • Figure 2 shows an example of transmitting to another transmit and receive point independently.
  • the aperiodic sounding reference signal is transmitted through a serving transmission / reception point serving the terminal, and the periodic sounding reference signal is transmitted to another transmission point independently of the physical uplink channel. May be sent.
  • one of a periodic and aperiodic sounding reference signal one of which is distinguished from an ID for a physical uplink channel, is independently referenced to a sounding reference.
  • the signal ID is generated using the cell ID of the serving transmission / reception point serving the terminal, and the other is generated using the signal ID.
  • one of the periodic and aperiodic sounding reference signals is used. The signal is transmitted to the transmission / reception point indicated by the ID, and the other is transmitted to the serving transmission / reception point.
  • one of the periodic and aperiodic sounding reference signals is transmitted independently of the physical uplink channel, and the other is transmitted to the serving transmission / reception point.
  • the transmission target of the sounding reference signal transmitted independently may be the same as the transmission target of the physical uplink channel or may be transmitted to the serving transmission / reception point.
  • a sequence setting for a sounding reference signal is made independently of the PUCCH and the PUSCH. Also, independent sequences may be set for the periodic sounding reference signal and the non-periodic sounding reference signal.
  • the physical uplink channel is generated through the reference signal ID while the sounding reference signal is generated using the physical cell ID of the serving transmission / reception point.
  • the reception point for the PUSCH or the PUCCH is set to a transmission / reception point other than a serving transmission / reception point, that is, a downlink transmission entity, that is, a UE-specific PUSCH when generating a sequence for transmitting the PUSCH or PUCCH reference signal
  • a transmission / reception point that is, a downlink transmission entity
  • a UE-specific PUSCH when generating a sequence for transmitting the PUSCH or PUCCH reference signal
  • one or more of the aperiodic and periodic sounding reference signals are transmitted to other transmission / reception points so as not to follow the sequence setting of the PUCCH or the PUSCH.
  • the receiving target of the sounding reference signal is set as the serving transmission / reception point.
  • At least one of the periodic sounding reference signal and the aperiodic sounding reference signal may be referred to as a reference signal ID associated with a physical uplink channel. or ), Not the physical cell ID of the serving send or receive point ( Can be generated using
  • FIG. 27 is a flowchart of a sounding reference signal transmission method according to another embodiment described above.
  • the method of transmitting a sounding reference signal may include an uplink reference signal ID associated with a physical uplink channel independent of a cell ID of a transmit / receive point from one transmit / receive point among two or more different transmit / receive points.
  • step S2710 Receiving a terminal-specific parameter indicating a step (S2710) and generating a sounding reference signal using the physical cell ID of the above-mentioned one transmission and reception point, that is, the transmission and reception point serving the terminal (S2720) and step S2710
  • step S2730 and step S2720 a physical uplink channel and a corresponding demodulation reference signal (DM-RS) are transmitted to a transmission / reception point 112 indicated by an uplink reference signal ID using an uplink reference signal ID in S2720.
  • DM-RS demodulation reference signal
  • the sounding reference signal may include at least one of a periodic and aperiodic sounding reference signal.
  • the physical uplink channel may include at least one of a PUCCH and a PUSCH.
  • the reception target of the physical uplink channel transmitted in step S2730 is set to a transmission / reception point 112 different from the transmission / reception point 110 serving to the terminal 120
  • the reception target of the physical uplink channel is uplink described above. It only means that it can be set independently by the reference signal ID, and the transmission and reception point 110 serving the terminal 120 may be set as a reception target.
  • the sounding reference signal in FIG. 27 includes at least one of periodic and aperiodic sounding reference signals, and the physical uplink channel includes at least one of PUCCH and PUSCH. According to the present invention, there may be various embodiments for sounding RS transmission.
  • FIG. 28 illustrates that when a PUCCH is transmitted to a transmit / receive point instead of a serving transmit / receive point in a CoMP implementation in which transmit / receive points use different cell IDs (Cell ID # 1 and Cell ID # 2), the sounding reference signal is transmitted to the serving transmit / receive point. It is a figure which shows what is transmitted.
  • FIG. 29 illustrates that a sounding reference signal is transmitted to a serving transmission / reception point when a PUCCH is transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • the sounding reference signal is transmitted to the serving transmission / reception point, so that the sounding reference signal and the PUCCH are transmitted separately.
  • FIG. 30 illustrates a sounding reference signal transmitted to a serving transmission / reception point when a PUSCH is transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use different cell IDs (Cell ID # 1 and Cell ID # 2). It is a figure which shows what is transmitted.
  • FIG. 31 illustrates that a sounding reference signal is transmitted to a serving transmission / reception point when a PUSCH is transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • Cell ID # 0 Cell ID # 0
  • the sounding reference signal is transmitted to the serving transmission / reception point, so that the sounding reference signal and the PUSCH are transmitted separately.
  • FIG. 32 illustrates that a sounding reference signal is transmitted and received when a PUSCH and a PUCCH are transmitted to a transmit / receive point instead of a serving transmit / receive point in a CoMP implementation in which transmit / receive points use different cell IDs (Cell ID # 1 and Cell ID # 2). A diagram showing what is sent to the point.
  • FIG. 33 illustrates that a sounding reference signal is transmitted to a serving transmission / reception point when a PUSCH and a PUCCH are transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0). Figure is shown.
  • the sounding reference signals are transmitted to the serving transmit and receive points, so that the sounding reference signals and the PUSCH and PUCCH are separated. Will be sent.
  • the sounding reference signal generated by the physical cell ID of the serving transmission / reception point is at least one of periodic and aperiodic sounding reference signals. Therefore, one of the periodic and aperiodic sounding reference signals may be generated using the serving transmission / reception point cell ID and the other may be generated using the uplink reference signal ID.
  • one of the periodic and aperiodic sounding reference signals is the physical cell ID of the serving transmit / receive point. ) May be generated using a reference signal ID associated with a physical uplink channel ( or Can be generated).
  • FIG. 34 illustrates a periodic sounding RS when a PUCCH is transmitted to a transmit / receive point instead of a serving transmit / receive point in a CoMP implementation in which transmit / receive points use different cell IDs (Cell ID # 1 and Cell ID # 2).
  • the aperiodic sounding reference signal is a diagram illustrating that the APC is transmitted in association with a PUCCH.
  • FIG. 35 illustrates that a periodic sounding reference signal is aperiodic sounding to a serving transmission / reception point when a PUCCH is transmitted to a transmission / reception point instead of a serving transmission / reception point in a CoMP implementation in which transmission / reception points use the same cell ID (Cell ID # 0).
  • the reference signal is transmitted in association with a PUCCH.
  • 34 and 35 illustrate a situation in which a periodic sounding reference signal is transmitted to a serving transmitting / receiving point and an aperiodic sounding reference signal is associated with a PUCCH, but this is only one example.
  • the signal may be transmitted to the serving transmission / reception point, the sounding reference signal may be transmitted in association with the PUCCH, and the association target may be a PUSCH instead of the PUCCH.
  • one of the periodic and aperiodic sounding reference signals may be one of the aforementioned transmission / reception points, that is, serving. Generated using the physical cell ID of the transmission and reception point 110 and the other is generated by the uplink reference signal ID, and the sounding reference signal transmission step (S2740), one of the above-described periodic and aperiodic sounding reference signal The transmission is transmitted to the serving transmission / reception point 110 and the other is transmitted to the transmission / reception point 112 indicated by the aforementioned uplink reference signal ID.
  • the reception target of the sounding reference signal may be the serving transmission / reception point.
  • the geometry not the serving transmission / reception point, is transmitted to other better transmission / reception points to overcome the coverage shortage of uplink. And an effect of increasing the uplink transmission rate.
  • 36 is a diagram illustrating a configuration of a base station according to another embodiment.
  • the base station 3600 includes a controller 3620, a transmitter 3630, and a receiver 3610.
  • the controller 3620 controls the operation of the overall base station according to the CoMP operation and the transmission of the uplink reference signal required to perform the above-described present invention.
  • the transmitter 3630 and the receiver 3610 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention.
  • FIG. 37 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • a user terminal 3700 includes a receiver 3710, a controller 3720, and a transmitter 3730.
  • the receiver 3710 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the receiver 3710 is a physical uplink channel (for example, a physical uplink channel) independent of a cell ID of a first transmit / receive point (for example, eNB 110 of FIG. 1) from a first transmit / receive point of one or more different transmit / receive points.
  • UE-specific configuration information indicating an uplink reference signal ID associated with one of an uplink data channel (PUSCH) and a physical uplink control channel (PUCCH) is received.
  • the uplink reference signal ID may be an uplink demodulation reference signal ID.
  • control unit 3720 controls the CoMP operation and transmission of the uplink reference signal, and the overall operation of the terminal for the transmission of the uplink channel required to perform the above-described present invention.
  • the controller 3720 generates a sounding reference signal using the uplink reference signal ID.
  • the sounding reference signal may be one of a periodic sounding reference signal and an aperiodic sounding reference signal.
  • the transmitter 3730 transmits an uplink reference signal and an uplink channel to the base station.
  • the transmitter 3730 transmits the generated sounding reference signal to a transmission / reception point indicated by the uplink reference signal ID, for example, a transmission / reception point different from the first transmission / reception point.

Abstract

La présente invention concerne un procédé d'émission et de réception d'un signal de référence de sondage de liaison montante et un terminal associé.
PCT/KR2013/004013 2012-06-11 2013-05-08 Procédé d'émission et de réception d'un signal de référence de sondage de liaison montante et terminal associé WO2013187603A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/406,779 US9756616B2 (en) 2012-06-11 2013-05-08 Method for transmitting and receiving uplink sounding reference signal, and terminal for same

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR10-2012-0062302 2012-06-11
KR20120062302 2012-06-11
KR20120096425 2012-08-31
KR10-2012-0096425 2012-08-31
KR10-2012-0141245 2012-12-06
KR1020120141245A KR101647868B1 (ko) 2012-06-11 2012-12-06 상향링크 채널과, 상향링크 채널에 연계된 상향링크 사운딩 참조신호 전송방법 및 그 단말

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WO2022226688A1 (fr) * 2021-04-25 2022-11-03 Qualcomm Incorporated Configuration et activation de signal de référence de sondage pour sondage de fréquence partiel

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WO2011099695A2 (fr) * 2010-02-09 2011-08-18 엘지전자 주식회사 Procédé d'émission d'un signal montant dans un système de communication sans fil et dispositif correspondant
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US20110294529A1 (en) * 2009-12-03 2011-12-01 Qualcomm Incorporated Sounding reference signal enhancements for wireless communication
KR20120023794A (ko) * 2009-07-30 2012-03-13 차이나 아카데미 오브 텔레커뮤니케이션즈 테크놀로지 사운딩 레퍼런스 신호의 송신 방법, 장치 및 시스템

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KR20110048421A (ko) * 2009-11-02 2011-05-11 주식회사 팬택 다수의 요소 반송파들을 사용하는 무선통신시스템에서 참조신호의 생성 및 송수신 방법
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WO2011099695A2 (fr) * 2010-02-09 2011-08-18 엘지전자 주식회사 Procédé d'émission d'un signal montant dans un système de communication sans fil et dispositif correspondant
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CN112822785A (zh) * 2021-01-14 2021-05-18 上海移远通信技术股份有限公司 数据传输的方法及装置、系统、可读存储介质
WO2022226688A1 (fr) * 2021-04-25 2022-11-03 Qualcomm Incorporated Configuration et activation de signal de référence de sondage pour sondage de fréquence partiel

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