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WO2018038346A2 - Procédé d'estimation de différence de rotation de phase entre symboles dans un système de communication sans fil et appareil associé - Google Patents

Procédé d'estimation de différence de rotation de phase entre symboles dans un système de communication sans fil et appareil associé Download PDF

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Publication number
WO2018038346A2
WO2018038346A2 PCT/KR2017/003957 KR2017003957W WO2018038346A2 WO 2018038346 A2 WO2018038346 A2 WO 2018038346A2 KR 2017003957 W KR2017003957 W KR 2017003957W WO 2018038346 A2 WO2018038346 A2 WO 2018038346A2
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Prior art keywords
layer
reference signal
pcrs
resource
symbol
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Korean (ko)
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WO2018038346A3 (fr
Inventor
김규석
정재훈
김기준
이길봄
안민기
최국헌
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for estimating a phase rotation difference between symbols in a wireless communication system.
  • Mobile communication systems have been developed to provide voice services while ensuring user activity.
  • the mobile communication system has expanded not only voice but also data service.As a result of the explosive increase in traffic, a shortage of resources and users are demanding higher speed services, a more advanced mobile communication system is required. have.
  • An object of the present disclosure is to provide a method of estimating a phase rotation difference between symbols using a demodulation reference signal (DMRS) and / or a phase noise compensation reference signal (PCRS).
  • DMRS demodulation reference signal
  • PCRS phase noise compensation reference signal
  • the present specification is to provide a method for defining a PCRS for each different layer (layer), and transmitting and receiving the defined PCRS through a predetermined resource.
  • the present specification is to provide a method for transmitting and receiving control information indicating the use of the PCRS resources in the layer not used for transmission of the total number of layers.
  • a method for estimating a phase rotation difference between symbols in a wireless communication system includes a plurality of DMRSs (demodulation reference signals) corresponding to each layer. Receiving them from a base station through a DMRS symbol, the plurality of DMRSs multiplexed with each other in a frequency domain; Receiving at least one first reference signal used for estimating a phase rotation difference between symbols from the base station through a specific resource region, wherein the specific resource region corresponds to the first reference signal in a frequency domain; Set in the same frequency tone as the DMRS corresponding to the same layer as the layer, and in at least one symbol after the DMRS symbol in the time domain; And estimating a phase rotation difference between the symbols based on at least one of the plurality of DMRSs or the at least one first reference signal.
  • DMRSs demodulation reference signals
  • At least one symbol after the DMRS symbol is set at a predetermined symbol interval.
  • the predetermined symbol interval may be 2 symbols, 3 symbols, or 4 symbols.
  • the first reference signal is set in units of 2 RB (Resource Block), 4 RB, 8 RB, or 16 RB in the frequency domain.
  • the number of the layer in the present specification is characterized in that 2, 4 or 8.
  • the method according to the present specification is characterized in that it further comprises the step of receiving control information from the base station indicating the use of the first reference signal resources in the unused layer.
  • control information may be included in Downlink Control Information (DCI) or Radio Resource Control (RRC) signaling.
  • DCI Downlink Control Information
  • RRC Radio Resource Control
  • the first reference signal resource in the unused layer is used for data transmission or additional transmission of the first reference signal in the used layer.
  • the used layer is a layer adjacent to the unused layer. It is characterized by.
  • the first reference signal is a phase rotation compensation reference signal (PCRS).
  • PCS phase rotation compensation reference signal
  • the present disclosure provides a terminal for estimating a phase rotation difference between symbols in a wireless communication system, the terminal comprising: a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor for controlling the RF unit, wherein the processor receives a plurality of demodulation reference signals (DMRS) corresponding to each layer from a base station through a DMRS symbol, and the plurality of DMRSs in a frequency domain Multiplexed with each other; At least one first reference signal used for estimating a phase rotation difference between symbols is received from the base station through a specific resource region, and the specific resource region is a layer corresponding to the first reference signal in a frequency domain.
  • DMRS demodulation reference signals
  • the present specification has an effect of minimizing performance degradation that may occur in the process of estimating and compensating for the phase noise through the PCRS.
  • the present specification has an effect of increasing the efficiency of resource use by additionally transmitting the PCRS resources of the unused layer or the PCRS of the used layer.
  • FIG. 1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.
  • FIG. 2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.
  • FIG. 3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.
  • FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
  • FIG. 5 illustrates a reference signal pattern mapped to a downlink resource block pair in a wireless communication system to which the present invention can be applied.
  • FIG. 6 is a diagram illustrating an example of a power spectral density of an oscillator.
  • FIG. 7 is a diagram illustrating an example of a DM-RS structure defined for each layer proposed in the present specification.
  • FIG. 8 is a diagram illustrating an example of a PCRS defined for each layer proposed in the present specification.
  • FIG. 9 is a diagram illustrating still another example of PCRS defined for each layer proposed in the present specification.
  • FIG. 10 is a diagram illustrating an example of a method of utilizing PCRS resources of a layer not used for transmission proposed in the present specification.
  • FIG. 11 is a diagram illustrating still another example of a method of utilizing PCRS resources of a layer not used for transmission proposed in the present specification.
  • FIG. 12 is a diagram illustrating another example of a method of using a PCRS resource of a layer not used for transmission proposed in the present specification.
  • FIG. 13 is a diagram illustrating still another example of a method of using a PCRS resource of a layer not used for transmission proposed in the present specification.
  • FIG. 14 is a flowchart illustrating an example of a PCRS transmission and reception method proposed in the present specification.
  • FIG. 15 illustrates a block diagram of a wireless communication device to which the present invention can be applied.
  • a base station has a meaning as a terminal node of a network that directly communicates with a terminal.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), and the like. .
  • a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.
  • UE user equipment
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS Advanced Mobile Station
  • WT Wireless Terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA).
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A (advanced) is the evolution of 3GPP LTE.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
  • FIG. 1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.
  • 3GPP LTE / LTE-A supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
  • FDD frequency division duplex
  • TDD time division duplex
  • Type 1A illustrates the structure of a type 1 radio frame.
  • Type 1 radio frames may be applied to both full duplex and half duplex FDD.
  • a radio frame consists of 10 subframes.
  • One subframe consists of two consecutive slots in the time domain, and subframe i consists of slot 2i and slot 2i + 1.
  • the time taken to transmit one subframe is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
  • uplink transmission and downlink transmission are distinguished in the frequency domain. While there is no restriction on full-duplex FDD, the terminal cannot simultaneously transmit and receive in half-duplex FDD operation.
  • One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. Since 3GPP LTE uses OFDMA in downlink, the OFDM symbol is for representing one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period.
  • a resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.
  • FIG. 1B illustrates a frame structure type 2.
  • an uplink-downlink configuration is a rule indicating whether uplink and downlink are allocated (or reserved) for all subframes.
  • Table 1 shows an uplink-downlink configuration.
  • 'D' represents a subframe for downlink transmission
  • 'U' represents a subframe for uplink transmission
  • 'S' represents a downlink pilot.
  • a special subframe consisting of three fields: a time slot, a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the uplink-downlink configuration can be classified into seven types, and the location and / or number of downlink subframes, special subframes, and uplink subframes are different for each configuration.
  • Switch-point periodicity refers to a period in which an uplink subframe and a downlink subframe are repeatedly switched in the same manner, and both 5ms or 10ms are supported.
  • the special subframe S exists every half-frame, and in case of having a period of 5ms downlink-uplink switching time, it exists only in the first half-frame.
  • subframes 0 and 5 and DwPTS are sections for downlink transmission only.
  • the subframe immediately following the UpPTS and the subframe subframe is always an interval for uplink transmission.
  • the uplink-downlink configuration may be known to both the base station and the terminal as system information.
  • the base station may notify the terminal of the change of the uplink-downlink allocation state of the radio frame by transmitting only an index of the configuration information.
  • the configuration information is a kind of downlink control information, which may be transmitted through a physical downlink control channel (PDCCH) like other scheduling information, and is commonly transmitted to all terminals in a cell through a broadcast channel as broadcast information. May be
  • PDCCH physical downlink control channel
  • Table 2 shows the configuration of the special subframe (length of DwPTS / GP / UpPTS).
  • the structure of a radio frame according to the example of FIG. 1 is just one example, and the number of subcarriers included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may vary. Can be.
  • FIG. 2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.
  • one downlink slot includes a plurality of OFDM symbols in the time domain.
  • one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.
  • Each element on the resource grid is a resource element, and one resource block (RB) includes 12 ⁇ 7 resource elements.
  • the number N ⁇ DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • FIG. 3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.
  • up to three OFDM symbols in the first slot in a subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which PDSCH (Physical Downlink Shared Channel) is allocated. data region).
  • PDSCH Physical Downlink Shared Channel
  • An example of a downlink control channel used in 3GPP LTE includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), and the like.
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe.
  • the PHICH is a response channel for the uplink and carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for a hybrid automatic repeat request (HARQ).
  • Control information transmitted through the PDCCH is called downlink control information (DCI).
  • the downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (Tx) power control command for a certain terminal group.
  • the PDCCH is a resource allocation and transmission format of DL-SCH (Downlink Shared Channel) (also referred to as a downlink grant), resource allocation information of UL-SCH (Uplink Shared Channel) (also called an uplink grant), and PCH ( Paging information in paging channel, system information in DL-SCH, resource allocation for upper-layer control message such as random access response transmitted in PDSCH, arbitrary terminal It may carry a set of transmission power control commands for the individual terminals in the group, activation of Voice over IP (VoIP), and the like.
  • the plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH consists of a set of one or a plurality of consecutive CCEs.
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to the state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of available bits of the PDCCH are determined according to the association between the number of CCEs and the coding rate provided by the CCEs.
  • the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information.
  • the CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH.
  • RNTI Radio Network Temporary Identifier
  • a unique identifier of the terminal for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • a paging indication identifier for example, P-RNTI (P-RNTI) may be masked to the CRC.
  • the system information more specifically, the PDCCH for the system information block (SIB), the system information identifier and the system information RNTI (SI-RNTI) may be masked to the CRC.
  • SI-RNTI system information RNTI
  • RA-RNTI random access-RNTI
  • Enhanced PDCCH carries UE-specific signaling.
  • the EPDCCH is located in a physical resource block (PRB) that is UE-specifically configured.
  • PRB physical resource block
  • the PDCCH may be transmitted in up to three OFDM symbols in the first slot in the subframe, but the EPDCCH may be transmitted in a resource region other than the PDCCH.
  • the start time (ie, symbol) of the EPDCCH in the subframe may be configured in the terminal through higher layer signaling (eg, RRC signaling, etc.).
  • EPDCCH is a transport format associated with the DL-SCH, resource allocation and HARQ information, a transport format associated with the UL-SCH, resource allocation and HARQ information, resource allocation associated with Side-link Shared Channel (SL-SCH) and Physical Sidelink Control Channel (PSCCH) Can carry information, etc.
  • Multiple EPDCCHs may be supported and the UE may monitor a set of EPCCHs.
  • the EPDCCH may be transmitted using one or more consecutive enhanced CCEs (ECCEs), and the number of ECCEs per single EPDCCH may be determined for each EPDCCH format.
  • ECCEs enhanced CCEs
  • Each ECCE may be composed of a plurality of enhanced resource element groups (EREGs).
  • EREG is used to define the mapping of ECCE to RE.
  • the terminal may monitor the plurality of EPDCCHs. For example, one or two EPDCCH sets in one PRB pair in which the UE monitors EPDCCH transmission may be configured.
  • the EPCCH may use localized transmission or distributed transmission, so that the mapping of ECCE to the RE in the PRB may be different.
  • FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) carrying uplink control information is allocated to the control region.
  • the data region is allocated a Physical Uplink Shared Channel (PUSCH) that carries user data.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • a PUCCH for one UE is allocated a resource block (RB) pair in a subframe.
  • RBs belonging to the RB pair occupy different subcarriers in each of the two slots.
  • This RB pair allocated to the PUCCH is said to be frequency hopping at the slot boundary (slot boundary).
  • Reference signal ( RS : Reference Signal)
  • the signal Since data is transmitted over a wireless channel in a wireless communication system, the signal may be distorted during transmission. In order to correctly receive the distorted signal at the receiving end, the distortion of the received signal must be corrected using the channel information.
  • a signal transmission method known to both a transmitting side and a receiving side and a method of detecting channel information using a distorted degree when a signal is transmitted through a channel are mainly used.
  • the above-mentioned signal is called a pilot signal or a reference signal (RS).
  • RS can be classified into two types according to its purpose. There are RSs for channel information acquisition and RSs used for data demodulation. Since the former has a purpose for the UE to acquire channel information on the downlink, it should be transmitted over a wide band, and a UE that does not receive downlink data in a specific subframe should be able to receive and measure its RS. It is also used for measurements such as handover.
  • the latter is an RS that the base station sends along with the corresponding resource when the base station transmits the downlink, and the UE can estimate the channel by receiving the RS, and thus can demodulate the data. This RS should be transmitted in the area where data is transmitted.
  • the downlink reference signal is one common reference signal (CRS: common RS) for acquiring information on channel states shared by all terminals in a cell, measurement of handover, etc. and a dedicated reference used for data demodulation only for a specific terminal. There is a dedicated RS. Such reference signals may be used to provide information for demodulation and channel measurement. That is, DRS is used only for data demodulation and CRS is used for both purposes of channel information acquisition and data demodulation.
  • CRS common reference signal
  • the receiving side measures the channel state from the CRS and transmits an indicator related to the channel quality such as the channel quality indicator (CQI), precoding matrix index (PMI) and / or rank indicator (RI). Feedback to the base station).
  • CRS is also referred to as cell-specific RS.
  • CSI-RS a reference signal related to feedback of channel state information
  • the DRS may be transmitted through resource elements when data demodulation on the PDSCH is needed.
  • the UE may receive the presence or absence of a DRS through a higher layer and is valid only when a corresponding PDSCH is mapped.
  • the DRS may be referred to as a UE-specific RS or a demodulation RS (DMRS).
  • FIG. 5 illustrates a reference signal pattern mapped to a downlink resource block pair in a wireless communication system to which the present invention can be applied.
  • a downlink resource block pair may be represented by 12 subcarriers in one subframe ⁇ frequency domain in a time domain in a unit in which a reference signal is mapped. That is, one resource block pair on the time axis (x-axis) has a length of 14 OFDM symbols in case of normal cyclic prefix (normal CP) (in case of FIG. 9 (a)), and an extended cyclic prefix ( extended CP: Extended Cyclic Prefix) has a length of 12 OFDM symbols (in case of FIG. 9 (b)).
  • normal CP normal cyclic prefix
  • extended CP Extended Cyclic Prefix
  • the resource elements (REs) described as '0', '1', '2' and '3' in the resource block grid are determined by the CRS of the antenna port indexes '0', '1', '2' and '3', respectively.
  • the location of the resource element described as 'D' means the location of the DRS.
  • the CRS is used to estimate a channel of a physical antenna and is distributed in the entire frequency band as a reference signal that can be commonly received to all terminals located in a cell. That is, this CRS is a cell-specific signal and is transmitted every subframe for the wideband.
  • the CRS may be used for channel quality information (CSI) and data demodulation.
  • CSI channel quality information
  • CRS is defined in various formats depending on the antenna arrangement at the transmitting side (base station).
  • base station In a 3GPP LTE system (eg, Release-8), RS for up to four antenna ports is transmitted according to the number of transmit antennas of a base station.
  • the downlink signal transmitting side has three types of antenna arrangements such as a single transmit antenna, two transmit antennas, and four transmit antennas. For example, if the number of transmitting antennas of the base station is two, CRSs for antenna ports 0 and 1 are transmitted, and if four, CRSs for antenna ports 0 to 3 are transmitted.
  • the reference signal for the single antenna port is arranged.
  • the reference signals for the two transmit antenna ports are arranged using time division multiplexing (TDM) and / or FDM frequency division multiplexing (FDM) scheme. That is, the reference signals for the two antenna ports are assigned different time resources and / or different frequency resources so that each is distinguished.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • reference signals for the four transmit antenna ports are arranged using the TDM and / or FDM scheme.
  • the channel information measured by the receiving side (terminal) of the downlink signal may be transmitted by a single transmit antenna, transmit diversity, closed-loop spatial multiplexing, open-loop spatial multiplexing, or It may be used to demodulate data transmitted using a transmission scheme such as a multi-user MIMO.
  • a reference signal when a multiple input / output antenna is supported, when a reference signal is transmitted from a specific antenna port, the reference signal is transmitted to a location of resource elements specified according to a pattern of the reference signal, and the location of resource elements specified for another antenna port. Is not sent to. That is, reference signals between different antennas do not overlap each other.
  • mapping CRSs to resource blocks are defined as follows.
  • Equation 1 k and l represent a subcarrier index and a symbol index, respectively, and p represents an antenna port.
  • the position of the reference signal is in the frequency domain It depends on the value. Since is dependent on the cell ID, the position of the reference signal has various frequency shift values according to the cell.
  • the position of the CRS may be shifted in the frequency domain according to the cell in order to improve channel estimation performance through the CRS.
  • reference signals in one cell are allocated to the 3k th subcarrier, and reference signals in another cell are allocated to the 3k + 1 th subcarrier.
  • the reference signals are arranged at six resource element intervals in the frequency domain, and are separated at three resource element intervals from the reference signal allocated to another antenna port.
  • reference signals are arranged at constant intervals starting from symbol index 0 of each slot.
  • the time interval is defined differently depending on the cyclic prefix length.
  • the reference signal In the case of the normal cyclic prefix, the reference signal is located at symbol indexes 0 and 4 of the slot, and in the case of the extended cyclic prefix, the reference signal is located at symbol indexes 0 and 3 of the slot.
  • the reference signal for the antenna port having the maximum value of two antenna ports is defined in one OFDM symbol.
  • the reference signals for reference signal antenna ports 0 and 1 are located at symbol indices 0 and 4 (symbol indices 0 and 3 for extended cyclic prefix) of slots,
  • the reference signal for is located at symbol index 1 of the slot.
  • the positions in the frequency domain of the reference signal for antenna ports 2 and 3 are swapped with each other in the second slot.
  • DRS is used to demodulate data. Precoding weights used for a specific terminal in multiple I / O antenna transmission are used without change to estimate the corresponding channel by combining with the transmission channel transmitted from each transmission antenna when the terminal receives the reference signal.
  • the 3GPP LTE system (eg, Release-8) supports up to four transmit antennas and a DRS for rank 1 beamforming is defined.
  • the DRS for rank 1 beamforming also indicates a reference signal for antenna port index 5.
  • Equation 2 shows a case of a general cyclic transpose
  • Equation 3 shows a case of an extended cyclic transpose
  • Equations 2 and 3 k and l represent subcarrier indexes and symbol indexes, respectively, and p represents an antenna port.
  • n PRB represents the number of physical resource blocks. Denotes a frequency band of a resource block for PDSCH transmission.
  • ns represents the slot index, Represents a cell ID. mod stands for modulo operation.
  • the position of the reference signal is in the frequency domain It depends on the value. Since is dependent on the cell ID, the position of the reference signal has various frequency shift values according to the cell.
  • LTE system evolution In the advanced LTE-A system, it should be designed to support up to eight transmit antennas in the downlink of the base station. Therefore, RS for up to eight transmit antennas must also be supported. Since the downlink RS in the LTE system defines only RSs for up to four antenna ports, when the base station has four or more up to eight downlink transmit antennas in the LTE-A system, RSs for these antenna ports are additionally defined. Must be designed. RS for up to eight transmit antenna ports must be designed for both the RS for channel measurement and the RS for data demodulation described above.
  • an RS for an additional up to eight transmit antenna ports should be additionally defined in the time-frequency domain in which CRS defined in LTE is transmitted every subframe over the entire band.
  • the RS overhead becomes excessively large.
  • the newly designed RS in LTE-A system is divided into two categories, RS for channel measurement purpose for selecting MCS, PMI, etc. (CSI-RS: Channel State Information-RS, Channel State Indication-RS, etc.) And RS (Data Demodulation-RS) for demodulation of data transmitted through eight transmit antennas.
  • CSI-RS Channel State Information-RS, Channel State Indication-RS, etc.
  • RS Data Demodulation-RS
  • CSI-RS for the purpose of channel measurement has a feature that is designed for channel measurement-oriented purposes, unlike the conventional CRS is used for data demodulation at the same time as the channel measurement, handover, and the like. Of course, this may also be used for the purpose of measuring handover and the like. Since the CSI-RS is transmitted only for the purpose of obtaining channel state information, unlike the CRS, the CSI-RS does not need to be transmitted every subframe. In order to reduce the overhead of the CSI-RS, the CSI-RS is transmitted intermittently on the time axis.
  • the DM-RS is transmitted to the UE scheduled in the corresponding time-frequency domain for data demodulation. That is, the DM-RS of a specific UE is transmitted only in a region where the UE is scheduled, that is, a time-frequency region in which data is received.
  • the eNB should transmit CSI-RS for all antenna ports. Transmitting CSI-RS for each subframe for up to 8 transmit antenna ports has a disadvantage in that the overhead is too large. Therefore, the CSI-RS is not transmitted every subframe but is transmitted intermittently on the time axis. Can be reduced. That is, the CSI-RS may be periodically transmitted with an integer multiple of one subframe or may be transmitted in a specific transmission pattern. At this time, the period or pattern in which the CSI-RS is transmitted may be set by the eNB.
  • the UE In order to measure the CSI-RS, the UE must transmit the CSI-RS index of the CSI-RS for each CSI-RS antenna port of the cell to which it belongs, and the CSI-RS resource element (RE) time-frequency position within the transmitted subframe. , And information about the CSI-RS sequence.
  • RE resource element
  • the eNB should transmit CSI-RS for up to eight antenna ports, respectively.
  • Resources used for CSI-RS transmission of different antenna ports should be orthogonal to each other.
  • the CSI-RSs for each antenna port may be mapped to different REs so that these resources may be orthogonally allocated in the FDM / TDM manner.
  • the CSI-RSs for different antenna ports may be transmitted in a CDM scheme that maps to orthogonal codes.
  • the eNB informs its cell UE of the information about the CSI-RS, it is necessary to first inform the information about the time-frequency to which the CSI-RS for each antenna port is mapped. Specifically, the subframe numbers through which the CSI-RS is transmitted, or the period during which the CSI-RS is transmitted, the subframe offset through which the CSI-RS is transmitted, and the OFDM symbol number where the CSI-RS RE of a specific antenna is transmitted, and the frequency interval (spacing), the RE offset or shift value in the frequency axis.
  • PCRS Phase Compensation Reference Signal Signal
  • the UE If the UE detects an xPDCCH with DCI format B1 or B2 in subframe n intended for it, the UE receives DL PCRS at the PCRS antenna port indicated in the DCI at the corresponding subframe.
  • the UE detects an xPDCCH with DCI format A1 or A2 in subframe n intended for it, then the UE is the same one as the assigned DM-RS antenna port indicated in DCI except the conditions (condition 1 and condition 2) below.
  • two PCRS antenna ports are used to transmit UL PCRS in subframe n + 4 + m + 1.
  • Table 3 shows an example of the relative transmit power ratio of PCRS and xPUSCH on a given layer.
  • the PCRS associated with the xPUSCH is transmitted at (1) antenna port (p) p ⁇ ⁇ 40,41,42,43 ⁇ , and (2) present and only compensates for phase noise if the xPUSCH transmission is associated with the corresponding antenna port. Is a valid criterion for (3) is transmitted only on the physical resource blocks and symbols to which the corresponding xPUSCH is mapped.
  • the reference signal sequence r (m) is defined as in Equation 4 below.
  • a pseudo-random sequence c (i) is defined by a gold sequence of length-31, and a pseudo random sequence generator is initialized at the beginning of each subframe, as shown in equation (5).
  • Resource element Mapping Mapping to resource elements
  • the frequency domain index allocated for the corresponding xPUSCH transmission In the physical resource block having a, part of the reference signal sequence r (m) Complex-value modulation symbol for the corresponding xPUSCH symbols in the subframe according to Is mapped to.
  • the resource element (k, l ') used for transmission of UE specific PCRS from one UE on any antenna port in set S is not used for transmission of xPUSCH on any antenna port in the same subframe. .
  • Baseband signals transmitted by the transmitting end are shifted to the passband by the carrier frequency generated by the oscillator, and signals transmitted through the carrier frequency are transmitted by the same carrier frequency by the same carrier frequency at the receiving end (e.g., terminal). Is converted to.
  • the signal received by the receiver may include distortion associated with the carrier.
  • the reason for such carrier frequency offset is that the oscillators used at the transmitter and the receiver are not the same or the Doppler frequency transition occurs as the terminal moves.
  • the Doppler frequency is proportional to the moving speed and the carrier frequency of the terminal and is defined as in Equation 7 below.
  • Equation 7 Denotes the carrier frequency, the Doppler frequency, the movement speed of the terminal, and the speed of light, respectively.
  • Equation 8 the normalized carrier frequency offset ⁇ is defined as in Equation 8 below.
  • Equation 8 Denotes a carrier frequency offset normalized to a carrier frequency offset, a subcarrier spacing, and a subcarrier spacing in order.
  • the received signal in the time domain is the result of multiplying the transmitted signal by the phase rotation
  • the received signal in the frequency domain is the result of shifting the transmitted signal in the frequency domain.
  • ICI inter-carrier-interference
  • Equation 9 the received signal in the frequency domain is expressed by Equation 9 below.
  • Equation 9 shows a received signal having a CFO in the frequency domain.
  • Equation 9 Denote subcarrier index, symbol index, FFT size, received signal, transmitted signal, frequency response, ICI due to CFO, and white noise in order.
  • Equation 9 when the carrier frequency offset exists, the amplitude and phase of the k-th subcarrier are distorted, and it can be seen that interference by adjacent subcarriers occurs.
  • interference by an adjacent subcarrier may be given by Equation 10 below.
  • Equation 10 represents the ICI caused by the CFO.
  • the baseband signal transmitted by the transmitter is shifted to the passband by the carrier frequency generated by the oscillator, and the signal transmitted through the carrier frequency is converted into the baseband signal by the same carrier frequency at the receiver.
  • the signal received by the receiver may include distortion associated with the carrier wave.
  • phase noise generated due to unstable characteristics of an oscillator used in a transmitter and a receiver may be mentioned.
  • This phase noise refers to the frequency fluctuating with time around the carrier frequency.
  • This phase noise is a random process with zero mean and is modeled as a Wiener process and affects the OFDM system.
  • phase noise tends to increase as the frequency of the carrier increases.
  • This phase noise tends to be characterized by a power spectral density with the same oscillator.
  • FIG. 6 is a diagram illustrating an example of a power spectral density of an oscillator.
  • the distortion of the signal due to the phase noise appears in the form of a common phase error (CPE) and inter-carrier interference (ICI) in an OFDM system.
  • CPE common phase error
  • ICI inter-carrier interference
  • Equation 11 shows the effect of the phase noise on the received signal of the OFDM system. That is, Equation 11 represents a received signal having phase noise in the frequency domain.
  • Equation 11 Indicates the subcarrier index, symbol index, FFT size, received signal, transmitted signal, frequency response, common phase error due to phase noise, inter-carrier interference due to phase noise, white noise, and phase rotation due to phase noise, respectively.
  • PCRS phase noise compensation reference signal
  • the first embodiment provides a method of defining PCRS for each different layer and transmitting PCRS defined for each layer on the same frequency tone as the DM-RS mapped to each layer. .
  • Precoding of the transmission data is performed based on a layer.
  • a DM-RS representing a reference signal for demodulation is defined for each layer.
  • the DM-RS transmitted for each layer may be defined as frequency division multiplexing (FDM).
  • FDM frequency division multiplexing
  • channel estimation for each layer may estimate channels for all occupied frequency tones using interpolation based on DM-RS defined in each frequency tone (or subcarrier).
  • channel estimation values of all frequency tones estimated through the interpolation may cause large and small performance deterioration according to an interpolation scheme or a channel condition.
  • Such performance degradation may be a cause of performance degradation in the process of estimating and compensating for distortion from phase noise using PCRS.
  • the CPE due to phase noise is estimated by estimating phase rotation between DM-RS and adjacent PCRS. To compensate.
  • CPE common phase error
  • FIG. 7 is a diagram illustrating an example of a DM-RS structure defined for each layer proposed in the present specification.
  • FIG. 7 shows an example of a DM-RS defined by frequency division multiplexing (FDM) for each layer.
  • FDM frequency division multiplexing
  • s denotes a layer index indicating different layers.
  • FIG. 7 illustrates a structure or form of a reference signal defined in one resource block (RB).
  • 1 RB includes 12 subcarriers.
  • the CPE has the same value for all frequency tones.
  • the frequency axis unit defining the PCRS may vary depending on the estimation performance.
  • the DL CCH is mapped in the first 2 symbols, and the DM-RS is mapped in the symbol after the DL CCH.
  • DM-RS can be seen to be mapped for each layer on the frequency axis.
  • FIG. 8 is a diagram illustrating an example of a PCRS defined for each layer proposed in the present specification.
  • the PCRS is defined for all OFDM symbols (symbol # 3 to symbol # 13) in which data is transmitted.
  • the PCRS may be defined only in an OFDM symbol in which data is defined according to a subframe type.
  • PCRS when data is transmitted from the 4th OFDM symbol to the 11th OFDM symbol of a specific subframe, PCRS may be defined to be transmitted only to the corresponding OFDM symbols.
  • phase noise If the influence of phase noise is small, that is, the change of the CPE is small, the impairment due to phase noise is sufficiently estimated and compensated even without defining the PCRS for all (data) OFDM symbols as shown in FIG. can do.
  • FIG. 9 illustrates an example of defining PCRS in units of 2 OFDM symbols instead of all OFDM symbols.
  • FIG. 9 is a diagram illustrating another example of the PCRS defined for each layer proposed in the present specification.
  • PCRS defined for each layer is arranged on the time axis at intervals of 2 OFDM symbols.
  • the OFDM symbol interval in which the PCRS is defined may be 3 OFDM symbol intervals, 4 OFDM symbol intervals, etc. in addition to the 2 OFDM symbol intervals as shown in FIG. 9.
  • FIG. 8 and FIG. 9 illustrate the PCRS defined in units of 4 RBs, this is merely an example, and RB units in which PCRSs are defined may be 2 RBs, 8 RBs, 16 RBs, and the like.
  • the case in which the total number of layers is 4 is illustrated as an example in FIGS. 8 and 9, but the present invention is not limited thereto and the salping methods may be applied even when the total number of layers is 2, 8, 12, or the like.
  • the resource of the PCRS for the layer not used for transmission is transmitted to data or (layer used for transmission). For the further transmission of the PCRS.
  • the base station may transmit a usage (data transmission, PCRS additional transmission, etc.) for the PCRS resource of the layer that does not transmit (or is not used for transmission) to the terminal through DCI or RRC signaling.
  • the terminal may receive data or additional PCRS (via a layer not used for transmission) based on DCI or RRC signaling received from the base station.
  • the second embodiment provides a method for using the PCRS resource of the unused layer for various purposes when only some layers of the entire layers are used.
  • the PCRS resource of the unused layer may be used for additional data transmission or additional redundancy bit transmission, thereby increasing throughput or improving reliability.
  • the PCRS resource of the unused layer is used to transmit additional PCRS, it is possible to improve the estimation performance for impairment due to phase noise.
  • the base station can improve the transmission efficiency by appropriately utilizing the additional PCRS resources.
  • FIG. 10 is a diagram illustrating an example of a method of utilizing PCRS resources of a layer not used for transmission proposed in the present specification.
  • FIG. 10 shows an example of using a PCRS resource of a layer not used for transmission for additional data transmission or additional redundancy bit transmission.
  • FIG. 10 illustrates an example of using a PCRS resource for an unused layer as a data resource.
  • a portion labeled "Resource for data transmission" indicates that a PCRS resource of an unused layer is used as a data resource.
  • layer 3 since layer 3 is not used for transmission, it means that the PCRS resource for layer 3 can be used as a data resource.
  • the data resource may be utilized for additional data bit transmission or redundancy bit transmission.
  • different layers may mean different terminals.
  • layers 0 and 1 may indicate layers for the terminal 1
  • layers 2 and 3 may indicate layers for the terminal 2.
  • the PCRS resources for the layers of different terminals may be set not to be transmitted as a default value for orthogonality of the reference signal.
  • the terminal for transmitting data may increase the efficiency of resource utilization by using a PCRS resource that is not used for uplink transmission of the other terminal for data transmission.
  • FIG. 10 illustrates that PCRS is transmitted in all (data) OFDM symbols
  • the present invention is not limited thereto and may be used in an example of PCRS transmitted at symbol intervals of 2 OFDM symbols or more.
  • FIG. 11 is a diagram illustrating still another example of a method of utilizing PCRS resources of a layer not used for transmission proposed in the present specification.
  • FIG. 11 shows an example in which PCRS resources of a layer not used for transmission are used for additional transmission of PCRS for a layer used for transmission.
  • FIG. 11 shows an example in which a PCRS resource for layer 1 is converted to a PCRS resource for layer 0 and used.
  • the PCRS resource in the layer used in the present specification may be interpreted to mean the same as the PCRS resource on the antenna port, the PCRS resource on the signal stream, and the like.
  • the number of layers or layers represents the number of signal streams transmitted through each path.
  • the transmitting end transmits the number of layers corresponding to the number of ranks used for signal transmission, unless otherwise specified, the rank has the same meaning as the number of layers.
  • an antenna port is defined such that a channel carrying a symbol on the antenna port can be inferred from a channel carrying another symbol on the same antenna port.
  • the resource grid of FIG. 2 may exist for each antenna port.
  • the number of layers is equal to or smaller than the number of antenna ports, and unless otherwise specified in the present specification, layers and antenna ports are to be interpreted as having the same meaning.
  • converted resource for data transmission 1110 shows an example of converting a PCRS resource for layer 1 to a data resource.
  • the additional PCRS resource for layer 0 is defined in the same frequency tone as the adjacent DM-RS frequency tone of the same layer.
  • the PCRS resource for layer 1 in subcarrier # 29 may not be used for PCRS transmission but may be used for data transmission for layer 0.
  • the PCRS for layer 0 may be additionally transmitted.
  • the PCRS resource for layer 1 defined in subcarrier # 29 is used as a data transmission resource for layer 0, and the PCRS for layer 0 is added to subcarrier # 28 that matches the DM-RS subcarrier tone of layer 0.
  • the PCRS resource for layer 1 that is not transmitted is used as an additional PCRS resource for layer 0 (that is, the PCRS resource for layer 1 is additionally added to PCRS for layer 0 adjacent to layer 1). In case of transmission), it is possible to improve the estimation performance of impairment due to phase noise by increasing the PCRS resource of layer 0.
  • FIG. 11 is for further improving estimation performance by using resources (PCRS layer or port not used for transmission) for another PCRS port (or PCRS layer) as resources for a specific PCRS port. Match the tone position of the PCRS with the position.
  • FIG. 11 imports a PCRS resource defined in subcarrier # 29 to subcarrier # 28 and uses it for PCRS transmission. It is used for data transmission.
  • FIG. 12 is a diagram illustrating another example of a method of using a PCRS resource of a layer not used for transmission proposed in the present specification.
  • FIG. 12 shows an example of using a PCRS resource of a layer not used for transmission as a PCRS resource of a layer used for transmission, for a PCRS defined in units of 2 OFDM symbols.
  • the PCRS resource for layer 1 that is not transmitted is used as an additional PCRS resource for layer 0 (adjacent thereto), the PCRS resource of layer 0 is increased to estimate the impairment due to phase noise. Can improve.
  • the content described with reference to FIG. 11 may be equally applied except that the PCRS is transmitted in units of 2 OFDM symbols.
  • FIG. 13 is a diagram illustrating another example of a method of utilizing PCRS resources of a layer not used for transmission proposed in the present specification.
  • FIG. 13 shows an example of switching to a PCRS resource for a layer using a PCRS resource for an unused layer.
  • the PCRS resource for layer 0 defined in units of 2 OFDM symbols may be defined in units of OFDM symbols (as shown in FIG. 12).
  • the base station transmits the PCRS in every symbol unit by using the structure of FIG. 13, it is possible to improve the estimation performance of the PCRS by estimating impairment due to phase noise for every symbol.
  • the PCRS structure of FIG. 13 may improve the estimation performance of a changing common phase error (CPE) value having the same value in units of OFDM symbols.
  • CPE common phase error
  • FIG. 13 assumes downlink, the same applies to the case of uplink.
  • PCRS Modulation and Coding Schemes
  • the PCRS may be defined in a layer having a high MCS, and the PCRS may not be defined in a layer having a low MCS.
  • one example of defining different MCSs for different layers (or antenna ports) is different from the one shown in FIG. 13, that data transmission occurs in a specific layer (or a specific antenna port), but does not use PCRS due to a low MCS.
  • a layer using PCRS due to a high MCS of a PCRS resource for a layer (or antenna port) represents a method of using a corresponding PCRS resource (PCRS resource for a layer not using PCRS due to a low MCS).
  • phase noise source when the phase noise source is the same for a plurality of layers, it is not necessary to transmit PCRS to all layers, that is, when PCRS is transmitted only to a specific layer and PCRS is not transmitted to another layer sharing the same,
  • the second embodiment is equally applicable.
  • FIG. 14 is a flowchart illustrating an example of a PCRS transmission and reception method proposed in the present specification.
  • the terminal receives a plurality of DMRSs (demodulation reference signals) corresponding to each layer from the base station through the DMRS symbol (S1410).
  • DMRSs demodulation reference signals
  • the plurality of DMRSs can be multiplexed with each other in the frequency domain.
  • the terminal receives at least one first reference signal used for estimating a phase rotation difference between symbols from the base station through a specific resource region (S1420).
  • the specific resource region is set in the same frequency tone as the DMRS corresponding to the same layer as the layer corresponding to the first reference signal in the frequency domain, and at least one symbol after the DMRS symbol in the time domain Can be set.
  • At least one symbol after the DMRS symbol may be set at a constant symbol interval, and the constant symbol interval may be 2 symbols, 3 symbols, 4 symbols, or the like.
  • the first reference signal may be set in units of 2 RB (Resource Block), 4 RB, 8 RB or 16 RB in the frequency domain.
  • the number of layers may be 2, 4, 8, or the like.
  • the terminal estimates a phase rotation difference between the symbols based on at least one of the plurality of DMRSs or the at least one first reference signal (S1430).
  • the terminal can decode the signal received from the base station in consideration of the estimated phase rotation difference between the symbols.
  • the terminal may receive control information from the base station indicating the usage of the first reference signal resource in the unused layer.
  • the control information may be included in downlink control information (DCI) or radio resource control (RRC) signaling.
  • DCI downlink control information
  • RRC radio resource control
  • the first reference signal resource in the unused layer may be used for data transmission or further transmission of the first reference signal in the used layer.
  • the used layer may be a layer adjacent to the unused layer.
  • the first reference signal may be represented by a phase rotation compensation reference signal (PCRS).
  • PCS phase rotation compensation reference signal
  • FIG. 15 illustrates a block diagram of a wireless communication device according to an embodiment of the present invention.
  • a wireless communication system includes a base station 1510 and a plurality of terminals 1520 located in an area of a base station 1510.
  • the base station 1510 includes a processor 1511, a memory 1512, and an RF unit 1513.
  • the processor 1511 implements the functions, processes, and / or methods proposed in FIGS. 1 to 14. Layers of the air interface protocol may be implemented by the processor 1511.
  • the memory 1512 is connected to the processor 1511 and stores various information for driving the processor 1511.
  • the RF unit 1513 is connected to the processor 1511 and transmits and / or receives a radio signal.
  • the terminal 1520 includes a processor 1521, a memory 1522, and an RF unit 1523.
  • the processor 1521 implements the functions, processes, and / or methods proposed in FIGS. 1 to 14. Layers of the air interface protocol may be implemented by the processor 1521.
  • the memory 1522 is connected to the processor 1521 and stores various information for driving the processor 1521.
  • the RF unit 1523 is connected to the processor 1521 and transmits and / or receives a radio signal.
  • the memories 1512 and 1522 may be inside or outside the processors 1511 and 1521 and may be connected to the processors 1511 and 1521 by various well-known means.
  • the base station 1510 and / or the terminal 1520 may have a single antenna or multiple antennas.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code may be stored in memory and driven by the processor.
  • the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

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Abstract

La présente invention concerne un procédé d'estimation d'une différence de rotation de phase entre symboles dans un système de communication sans fil, le procédé mis en œuvre par un terminal comprenant les étapes consistant à : recevoir, en provenance d'une station de base, par l'intermédiaire d'un symbole DMRS, une pluralité de signaux de référence de démodulation (DMRS), chaque signal correspondant à chaque couche ; recevoir au moins un premier signal de référence utilisé pour une estimation de la différence de rotation de phase entre symboles en provenance de la station de base par l'intermédiaire d'une région de ressource spécifique ; et estimer la différence de rotation de phase entre symboles sur la base d'au moins un signal de la pluralité de DMRS ou dudit premier signal de référence.
PCT/KR2017/003957 2016-08-23 2017-04-12 Procédé d'estimation de différence de rotation de phase entre symboles dans un système de communication sans fil et appareil associé Ceased WO2018038346A2 (fr)

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