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WO2015005739A1 - Procédé et appareil d'émission de signal de référence dans un système de communication sans fil - Google Patents

Procédé et appareil d'émission de signal de référence dans un système de communication sans fil Download PDF

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Publication number
WO2015005739A1
WO2015005739A1 PCT/KR2014/006287 KR2014006287W WO2015005739A1 WO 2015005739 A1 WO2015005739 A1 WO 2015005739A1 KR 2014006287 W KR2014006287 W KR 2014006287W WO 2015005739 A1 WO2015005739 A1 WO 2015005739A1
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Prior art keywords
reference signal
sequence
cyclic shift
orthogonal sequence
equation
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Korean (ko)
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윤성준
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Pantech Co Ltd
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Pantech Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • 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
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H04J13/18—Allocation of orthogonal codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • 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
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
    • H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
    • H04J2211/006—Single carrier frequency division multiple access [SC FDMA]

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting a reference signal in a wireless communication system.
  • UMTS Universal Mobile Telecommunications System
  • WCDMA wideband code division multiple access
  • GSM global system for mobile communications
  • GPRS general packet radio services
  • LTE Long-term evolution
  • LTE-A advanced LTE-A
  • 3GPP 3rd generation partnership project
  • a wireless communication system it is necessary to estimate an uplink channel or a downlink channel for data transmission / reception, system synchronization acquisition, channel information feedback, and the like.
  • fading occurs due to a multipath time delay.
  • the process of restoring the transmission signal by compensating for the distortion of the signal caused by a sudden environmental change due to fading is called channel estimation.
  • channel estimation it is necessary to measure the channel state (channel state) for the cell to which the terminal belongs or other cells.
  • channel estimation is generally performed by using a reference signal (RS) that the transceiver knows from each other.
  • RS reference signal
  • a subcarrier used for transmitting a reference signal is called a reference signal subcarrier, and a resource element used for data transmission is called a data subcarrier.
  • reference signals are allocated to all subcarriers and between data subcarriers.
  • the method of allocating a reference signal to all subcarriers uses a signal consisting of only a reference signal, such as a preamble signal, in order to obtain a gain of channel estimation performance. In this case, since the density of the reference signal is generally high, channel estimation performance may be improved as compared with the method of allocating the reference signal between data subcarriers.
  • FIG. 1 illustrates an example of a communication system in which a high power node and a low power node are disposed.
  • next generation communication system such as 3GPP LTE-A
  • a small cell based on a low-power node as well as a macro cell (F1) based on a high-power node as shown in FIG. 1.
  • F1 macro cell
  • the small cell may be considered both in frequency band F1 which is coverage of the macro cell and in frequency band F2 other than the coverage of the macro cell.
  • small cells may be provided in both indoor environments (shown in cubes in FIG. 1) and in outdoor environments (shown out of cubes in FIG. 1).
  • an ideal or non-ideal backhaul network may be supported between the macro cell and the small cell and / or between the small cells.
  • the small cell may be provided in both a low density deployment environment and / or a high density deployment environment.
  • Small cells aim to improve spectral efficiency with efficient deployment and operation.
  • various techniques may be proposed, and among them, a technique for reducing overhead for a user equipment (UE) specific reference signal such as a conventional demodulation reference signal (DMRS) may be proposed.
  • UE user equipment
  • DMRS demodulation reference signal
  • An object of the present invention is to provide a method and apparatus for transmitting a reference signal in a wireless communication system.
  • the present invention provides a method and apparatus for constructing and transmitting an uplink (UL) demodulation reference signal (DMRS) in a small cell environment.
  • DMRS uplink demodulation reference signal
  • the present invention provides a method and apparatus for configuring and transmitting UL DMRS through only one single carrier frequency division multiple access (SC-FDMA) symbol in one subframe in a small cell environment.
  • SC-FDMA single carrier frequency division multiple access
  • a method for transmitting a reference signal by a user equipment (UE) in a wireless communication system may further include generating a reference signal sequence according to whether or not an orthogonal sequence indicated by a base station is applied, performing precoding on the generated reference signal sequence, and converting the precoded reference signal sequence into the orthogonal sequence.
  • SC-FDMA single carrier frequency division multiple access
  • the precoded reference signal sequence is mapped to the resource elements included in two SC-FDMA symbols in one subframe, and the application of the orthogonal sequence is not applied. If indicated, the precoded reference signal sequence is one SC-FDMA in one subframe. It is mapped to the resource elements included in the view.
  • Whether or not the orthogonal sequence is applied may be indicated by a 3-bit cyclic shift field in downlink control information (DCI) transmitted from the base station.
  • DCI downlink control information
  • the first group may include a cyclic shift field having a value of 011, 100, 101, and 110.
  • the second group may include a cyclic shift field having a value of 000, 001, 010, and 111.
  • the precoded reference signal sequence may be mapped to the resource elements included in one SC-FDMA symbol of the first slot in one subframe.
  • Whether the orthogonal sequence is applied may be indicated by 1 bit additionally defined in the DCI transmitted from the base station.
  • a user equipment (UE) in a wireless communication system is provided.
  • the terminal is a reference signal generator configured to generate a reference signal sequence according to whether or not the orthogonal sequence indicated by the base station, performs precoding on the generated reference signal sequence, the precoded reference signal A resource mapper configured to map a sequence to resource elements according to whether or not the orthogonal sequence is applied, and to transmit a single carrier frequency division multiple access (SC-FDMA) signal generated based on the mapped reference signal sequence to the base station And a transmission unit configured, and when the application of the orthogonal sequence is instructed, the precoded reference signal sequence is mapped to the resource elements included in two SC-FDMA symbols in one subframe, and the orthogonal sequence If not applicable, the precoded reference signal sequence is Is mapped to the sub-my one SC-FDMA the resource elements included in the symbol in a frame.
  • SC-FDMA single carrier frequency division multiple access
  • a method for demodulating a physical uplink shared channel (PUSCH) by a base station in a wireless communication system.
  • the method includes transmitting indication information indicating whether an orthogonal sequence is applied to a user equipment (UE) and generating the reference signal sequence based on the indication information indicating whether the orthogonal sequence is applied.
  • UE user equipment
  • the generated reference signal sequence Is mapped to resource elements according to whether or not the orthogonal sequence is applied through precoding, and when the application of the orthogonal sequence is indicated, the precoded reference signal sequences are two SC-FDMA (single carriers) in one subframe. frequency division multiple access) is mapped to the resource elements included in the symbol, not applied to the orthogonal sequence If indicated, the precoded reference signal sequence is mapped to the resource elements included in one SC-FDMA symbols within one subframe.
  • the overhead of UL DMRS can be reduced in a small cell environment, and data throughput can be improved.
  • FIG. 1 illustrates an example of a communication system in which a high power node and a low power node are disposed.
  • FIG. 2 illustrates a wireless communication system to which an embodiment of the present invention can be applied.
  • 3 shows a structure of a radio frame in 3GPP LTE.
  • FIG. 5 shows an example of a conventional UL DMRS transmission method.
  • FIG. 6 shows an example of a PUSCH DMRS transmission method according to an embodiment of the present invention.
  • FIG. 7 shows an embodiment of a method of transmitting a reference signal according to an embodiment of the present invention.
  • FIG. 8 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
  • the present specification describes a communication network, and the work performed in the communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to the network. Work can be done in a system (for example, a base station) that manages the communication network, or a terminal linked to
  • 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
  • CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented by wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
  • IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted.
  • LTE-A (advanced) is the evolution of 3GPP LTE.
  • FIG. 2 illustrates a wireless communication system to which an embodiment of the present invention can be applied.
  • the wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like.
  • the wireless communication system 10 includes at least one base station (BS) 11.
  • Each base station 11 provides a communication service for a specific geographic area or frequency area and may be called a site.
  • the site may be divided into a plurality of regions 15a, 15b, and 15c, which may be called sectors, and the sectors may have different cell IDs.
  • a user equipment may be fixed or mobile, and may have a mobile station (MS), a mobile terminal (MS), a user terminal (UT), a subscriber station (SS), a wireless device, a PDA, and the like.
  • the base station 11 generally refers to a station that communicates with the terminal 12, and includes an evolved-NodeB (eNodeB), a base transceiver system (BTS), an access point, an femto eNB, and a household It may be called other terms such as a base station (HeNB), a relay, a remote radio head (RRH), and the like.
  • eNodeB evolved-NodeB
  • BTS base transceiver system
  • HeNB base station
  • RRH remote radio head
  • Cells 15a, 15b, and 15c should be interpreted in a comprehensive sense, indicating some areas covered by base station 11, and include mega cells, macro cells, micro cells, and pico. The term encompasses various coverage areas such as a pico cell and a femto cell.
  • a terminal typically belongs to one cell, and a cell to which the terminal belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are relatively determined based on the terminal.
  • downlink means communication from the base station 11 to the terminal 12
  • uplink means communication from the terminal 12 to the base station 11.
  • the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
  • the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
  • the wireless communication system may be any one of a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MIS) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
  • MIMO multiple-input multiple-output
  • MIS multiple-input single-output
  • SISO single-input single-output
  • SIMO single-input multiple-output
  • the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
  • the MISO system uses multiple transmit antennas and one receive antenna.
  • the SISO system uses one transmit antenna and one receive antenna.
  • the SIMO system uses one transmit antenna and multiple receive antennas.
  • the transmit antenna means a physical or logical antenna used to transmit one signal or stream
  • the receive antenna means a physical or logical antenna used to receive one signal or stream.
  • Wireless communication systems can be largely divided into frequency division duplex (FDD) and time division duplex (TDD).
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
  • the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
  • the uplink transmission and the downlink transmission are time-divided in the entire frequency band, and thus the downlink transmission by the base station and the uplink transmission by the terminal cannot be simultaneously performed.
  • uplink transmission and downlink transmission are performed in different subframes.
  • 3 shows a structure of a radio frame in 3GPP LTE. This may be referred to 3GPP TS 36.211 V11.2.0 (2013-02).
  • a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered with slots # 0 through # 19.
  • Transmission time interval (TTI) is a basic scheduling unit for data transmission. In 3GPP LTE, one TTI may be equal to the time taken for one subframe to be transmitted.
  • One radio frame may have a length of 10 ms, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of subcarriers in the frequency domain.
  • the OFDM symbol is used to represent one symbol period since 3GPP LTE uses OFDMA in downlink, and may be called a different name according to a multiple access scheme.
  • SC-FDMA when SC-FDMA is used as an uplink multiple access method, it may be referred to as an SC-FDMA symbol.
  • a resource block (RB) includes a plurality of consecutive subcarriers in one slot in resource allocation units.
  • the structure of the radio frame is merely an example. Accordingly, the number of subframes included in the radio frame, the number of slots included in the subframe, or the number of OFDM symbols included in the slot may be variously changed.
  • 3GPP LTE defines that one slot includes 7 OFDM symbols in a normal cyclic prefix (CP), and one slot includes 6 OFDM symbols in an extended CP.
  • CP normal cyclic prefix
  • the downlink subframe includes two slots in the time domain, and each slot includes seven OFDM symbols in a normal CP. Up to three OFDM symbols (up to four OFDM symbols for 1.4Mhz bandwidth) of the first slot in the subframe are the control regions to which control channels are allocated, and the remaining OFDM symbols are the PDSCH (physical downlink shared channel). Becomes the data area to be allocated.
  • the uplink slot includes a plurality of SC-FDMA symbols in the time domain and N RB resource blocks in the frequency domain.
  • the number N RB of resource blocks included in an uplink slot depends on an uplink transmission bandwidth set in a cell.
  • N RB in 3GPP LTE may be any one of 6 to 110.
  • One resource block includes a plurality of subcarriers in the frequency domain.
  • the structure of the downlink slot may also be the same as that of the uplink slot.
  • Each element on the resource grid is called a resource element.
  • one resource block corresponds to one slot with 0.5 ms in the time domain, and corresponds to a total of 12 subcarriers when the frequency spacing between each subcarrier is 15 KHz at 180 KHz in the frequency domain.
  • one resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of OFDM symbols and the number of subcarriers in the resource block is exemplarily described. Is not limited thereto.
  • the number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, the frequency interval, and the like. For example, the number of OFDM symbols is 7 for a normal CP and the number of OFDM symbols is 6 for an extended CP.
  • two resource blocks physically allocated in one subframe on the time axis may be referred to as a physical resource block (PRB) pair.
  • PRB physical resource block
  • Reference signal is generally transmitted in sequence.
  • the reference signal sequence a sequence having excellent correlation property may be used.
  • the reference signal sequence may use a constant amplitude zero auto-correlation (CAZAC) sequence.
  • the CAZAC sequence includes a ZCoff-based sequence or the like, and the ZC-based sequence may be cyclically extended or truncated according to a purpose.
  • the reference signal sequence may use a pseudo-noise (PN) sequence.
  • PN sequences include m-sequences, computer-generated PN sequences, gold sequences, and Kasami sequences.
  • the uplink reference signal may be divided into a demodulation reference signal (DMRS) and a sounding reference signal (SRS).
  • DMRS is a reference signal used for channel estimation for demodulation of a received signal.
  • DMRS is associated with transmission of a PUSCH or a PUCCH.
  • the SRS is a reference signal transmitted by the terminal to the base station for uplink scheduling.
  • the base station estimates an uplink channel based on the received sounding reference signal and uses the estimated uplink channel for uplink scheduling.
  • SRS is not associated with transmission of PUSCH or PUCCH.
  • the same kind of base sequence can be used for DMRS and SRS.
  • precoding applied to DMRS in uplink multi-antenna transmission may be the same as precoding applied to PUSCH. Cyclic shift separation is a primary scheme for multiplexing DMRS.
  • the SRS may not be precoded and may also be an antenna specified reference signal.
  • the reference signal sequence r u, v ( ⁇ ) (n) is a basic sequence according to Equation 1 It can be defined based on the cyclic shift (CS) of.
  • M sc RS m ⁇ N sc RB (1 ⁇ m ⁇ N RB max, UL ) is a length of a reference signal sequence.
  • the plurality of reference signal sequences may be defined by differently applying a cyclic shift value ⁇ from one basic sequence.
  • Basic sequence Is divided into a plurality of groups, where u ⁇ ⁇ 0,1,... , 29 ⁇ represents a sequence group number, and v represents a basic sequence number within the sequence group.
  • the sequence group number u and the basic sequence number v in the group may change over time by group hopping or sequence hopping, which will be described later.
  • the base sequence depends on the length M sc RS of the base sequence.
  • the sequence group number u of the slot n s may be defined based on the group hopping pattern f gh (n s ) and the sequence shift pattern f ss by Equation 2.
  • the sequence group number u may be obtained by performing a modulo 30 operation after adding a group hopping pattern f gh (n s ) and a sequence shift pattern f ss .
  • the sequence group number u can have a total of 30 values from 0 to 29.
  • Group hopping may be enabled or disabled by cell-specific parameter Group-hopping-enabled provided by a higher layer.
  • group hopping for PUSCH is configured to be activated on a cell basis, it may be deactivated for a specific UE by UE - specific parameter Disable-sequence-group-hopping .
  • the group hopping pattern f gh (n s ) may be different for PUSCH, PUCCH and SRS, and may be given by Equation 3.
  • Equation 3 c (i) is a pseudo-random sequence and may be defined by a Gold sequence of length-31.
  • a pseudo random sequence generator is used at the beginning of each radio frame Can be initialized to Referring to Equation 3, the group hopping pattern f gh (n s ) has a value of zero when group hopping is disabled.
  • the group hopping pattern f gh (n s ) is determined according to the identifier n ID RS and the slot number n s for the uplink reference signal when group hopping is activated.
  • n ID RS may be determined according to a transmission type.
  • the sequence shift pattern f ss may be different for PUCCH, PUSCH, and SRS.
  • Sequence hopping can be applied only to a reference signal sequence whose length is longer than 6N sc RB .
  • the base sequence number v 0 in the base sequence group is given.
  • the base sequence number v in the base sequence group in slot n s may be defined by equation (4).
  • Equation 4 c (i) is a pseudo random sequence and may be defined by a gold sequence of length-31.
  • a pseudo random sequence generator is generated at the beginning of each radio frame. Can be initialized to Referring to Equation 4, the basic sequence number v is determined according to the identifier n ID RS , the slot number n s , and f ss PUSCH for the uplink reference signal only when group hopping is deactivated and sequence hopping is activated. In the remaining cases, the default sequence number v is zero.
  • Sequence hopping may be activated or deactivated by cell-specific parameter sequence hopping-enabled provided by a higher layer.
  • sequence hopping for PUSCH may be deactivated for a specific UE by UE - specific parameter Disable-sequence-group-hopping .
  • DMRS transmission for PUSCH and / or PUCCH will be described.
  • FIG. 5 shows an example of a conventional UL DMRS transmission method.
  • the UL DMRS may be transmitted in every slot in every subframe in which a PUSCH or a PUCCH is transmitted.
  • information on a UL DMRS transmission bandwidth expressed in units of resource blocks (RBs) may be determined based on previously transmitted signaling information.
  • RBs to which a PUSCH is allocated for each UE may be determined based on a resource block assignment field of downlink control information (DCI).
  • DCI downlink control information
  • the UL DMRS sequence may be mapped and transmitted to all subcarriers in the RB used for DMRS transmission.
  • the PUSCH DMRS sequence r PUSCH ( ⁇ ) (.) Associated with the layer ⁇ ⁇ 0,1, ..., v-1 ⁇ may be defined by Equation 5.
  • M SC RS M SC PUSCH .
  • the PUSCH DMRS sequence is a base sequence based on a Zadoff-Chu (ZC) sequence.
  • Cyclic shift (CS) is generated with a length M SC RS corresponding to the RB used for PUSCH DMRS transmission (number of RBs used x number of subcarriers in the RB (usually 12)).
  • the basic sequence may be defined based on Equations 1 to 4 described above. That is, the basic sequence may be determined differently for each identifier N ID RS and slot for each uplink reference signal.
  • the identifier for each uplink reference signal may be a physical cell identifier or a virtual cell identifier.
  • the sequence group number u and the basic sequence number v of the basic sequence may vary depending on the slot number in the subframe.
  • the cyclic shift ⁇ ⁇ may be differently allocated to each UE and layer.
  • Orthogonal sequence or orthogonal cover code (OCC) w ( ⁇ ) (m) is a 3-bit cyclic shift field in the most recent uplink DCI for the transport block associated with the corresponding PUSCH transmission. It can be determined according to Table 1 using. That is, the orthogonal sequence w ( ⁇ ) (m) can be determined dynamically through the DCI.
  • n DMRS, ⁇ (2) is indicated by a 3-bit cyclic shift field signaled via DCI.
  • the cyclic shift value may be determined UE-specifically according to n DMRS, ⁇ (2) .
  • n cs, ⁇ used to calculate the cyclic shift ⁇ ⁇ can be obtained by modulo 12 operation of the sum of three parameters.
  • n DMRS (1) may be determined according to the parameter cyclicShift provided by a higher layer. n DMRS (1) may be cell specific assigned. Table 2 shows the mapping relationship between cyclicShift and n DMRS (1) .
  • n DMRS, ⁇ (2) is given by the cyclic shift field in the most recent uplink DCI for the transport block associated with the corresponding PUSCH transmission, as described in Table 1.
  • n DMRS, ⁇ (2) may be allocated differently for each UE.
  • n PN (n s ) associated with cyclic shift hopping (CSH) may be defined by Equation 7.
  • c (i) is a pseudo random sequence and may be defined by a gold sequence of length-31.
  • c (i) may be cell-specific.
  • the pseudo random sequence generator may be initialized to c init at the beginning of each radio frame. c init is configured when N ID csh_DMRS is not configured by a higher layer or when PUSCH transmission corresponds to retransmission of the same transport block as part of a random access response grant or a contention based random access procedure. Can be determined. Otherwise, Can be determined.
  • a vector of the reference signal may be precoded by Equation 8.
  • Equation 8 P is the number of antenna ports used for PUSCH transmission.
  • W is a precoding matrix.
  • P 2 or 4 for spatial multiplexing.
  • the DMRS sequence for each antenna port used for PUSCH transmission Is multiplied by the amplitude scaling factor ⁇ PUSCH , Can be mapped to resource blocks in order.
  • Sets and indexes of physical resource blocks used for mapping And the relationship between the antenna port number p may be the same as the corresponding PUSCH transmission.
  • the DMRS sequence may first be mapped to a resource element in an increasing direction in the frequency domain and in a direction in which the slot number increases.
  • the DMRS sequence may be mapped to a fourth SC-FDMA symbol (SC-FDMA symbol index 3) in the case of a normal CP and a third SC-FDMA symbol (SC-FDMA symbol index 2) in the case of an extended CP.
  • the PUSCH DMRS is transmitted through one SC-FDMA symbol every slot. That is, the PUSCH DMRS is transmitted through two SC-FDMA symbols, one for each of two slots in one subframe.
  • a method of reducing overhead of time-frequency resources for PUSCH DMRS may be proposed to improve spectral efficiency.
  • PUSCH DMRS may be transmitted only in one slot of two slots in one subframe. That is, PUSCH DMRS is transmitted through only one SC-FDMA symbol in one subframe. Since the channel state does not change significantly in the small cell environment, the number of SC-FDMA symbols allocated to the PUSCH DMRS can be reduced.
  • the OCC applied to two SC-FDMA symbols of two slots in one subframe cannot be applied. Thus, a specific MU-MIMO environment can be applied. May cause problems.
  • the PUSCH DMRS when transmitting the PUSCH DMRS in the small cell environment, when the application of the OCC is required, the PUSCH DMRS is configured and transmitted through two SC-FDMA symbols in one subframe in the same way as the conventional method, and the application of the OCC If this is not necessary, a method of configuring and transmitting a PUSCH DMRS through only one SC-FDMA symbol in one subframe may be proposed. In addition, a signaling method for indicating this to the UE may be proposed.
  • a method of configuring a PUSCH DMRS may vary based on whether OCC is required. First, the case where the application of the OCC is required. OCC can be applied to:
  • OCC may be applied when the allocated bandwidth is different between at least two UEs of the MU-MIMO.
  • a PUSCH and a PUSCH DMRS for UE A are allocated to RBs # 4, # 5, # 6, and # 7, and a PUSCH and PUSCH DMRS for UE B are allocated to RBs # 6, # 7, and # 8.
  • MU-MIMO is configured because UE A and UE B transmit PUSCH and PUSCH DMRS through RB # 6 and # 7.
  • OCC since only the cyclic shift cannot distinguish PUSCH DMRS for MU-MIMO UEs allocated to different bandwidths, OCC may be applied to distinguish MU-MIMO UEs.
  • OCC may be applied when the total number of layers used by UEs is 5 or more. For example, if PUSCH and PUSCH DMRS for UE A are allocated to RB # 4, # 5, and # 6, and PUSCH and PUSCH DMRS for UE B are allocated to RB # 4, # 5 and # 6, UE A UE and UE B transmit PUSCH and PUSCH DMRS through RB # 4, # 5, and # 6, so that MU-MIMO is configured. In addition, if UE A transmits PUSCH DMRS using two layers and UE B transmits PUSCH DMRS using four layers, the total number of layers is six.
  • UE A transmits PUSCH DMRS using two layers
  • UE B uses two layers
  • UE C uses one layer
  • the total number of layers is five.
  • OCC can be applied in this case.
  • PUSCH DMRS may be configured and transmitted through two SC-FDMA symbols in one subframe, as in the conventional PUSCH DMRS. That is, in order to configure the PUSCH DMRS, the contents of Equations 1 to 7, 7, 1, and 2 described above may be applied as they are.
  • PDSCH and DMRS are transmitted for only one UE in a single antenna transmission or SU-MIMO, that is, an allocated RB of a specific bandwidth, and the application of OCC is not necessary when the number of layers used for this is 4 or less. At this time, even if the OCC is not applied, each layer can be distinguished through up to four cyclic shifts.
  • n DMRS, 0 (2) 0 for layer 0.
  • PUSCH and PUSCH DMRS for UE A are allocated to RB # 4, # 5, and # 6, and PUSCH and PUSCH DMRS for UE B are allocated to RB # 4, # 5 and # 6, UE A UE and UE B transmit PUSCH and PUSCH DMRS through RB # 4, # 5, and # 6, so that MU-MIMO is configured.
  • the UE and the layer may be distinguished through up to four cyclic shifts.
  • the number of layers of UE A, UE B, UE C, and UE D is 1, respectively.
  • n DMRS, 0 (2) 0 for layer 0 of UE A
  • n DMRS, 1 (2) for layer 1 of UE A 6
  • n DMRS for layer 0 of UE B , 0 (2) 3
  • n DMRS for layer 1 of UE B , 1 (2) 9, respectively.
  • n DMRS, 0 (2) 0 for layer 0 of UE A
  • n DMRS, 1 for layer 1 of UE A (2) 6
  • FIG. 6 shows an example of a PUSCH DMRS transmission method according to an embodiment of the present invention.
  • a PUSCH DMRS may be configured and transmitted through only one SC-FDMA symbol in one subframe. That is, the PUSCH DMRS occupies one SC-FDMA symbol and is transmitted only in the first slot in the subframe and is not transmitted in the second slot in the subframe.
  • the SC-FDMA symbol of the second slot in the subframe that is conventionally used for the transmission of the PUSCH DMRS may be used for the transmission of data. As a result, throughput may increase.
  • the PUSCH DMRS may be transmitted through only one SC-FDMA symbol in one subframe, and accordingly, one or more of Equations 1 to 7 described above may be changed accordingly.
  • Equation 9 is a modified form of Equation 5.
  • Equation 10 is a modified form of Equation 5 or Equation 9.
  • Equation 10 is obtained by removing m from Equation 9.
  • Equation 3 a group hopping pattern f gh (n s ) used to determine the sequence group number u of the slot n s may be determined by Equation 3 as it is. However, in Equation 3, a group hopping pattern f gh (n s ) is determined for every slot. When no OCC is required, Equation 3 is a group hopping pattern for only one slot of two slots in one subframe. It can be interpreted that f gh (n s ) is determined.
  • Equation 11 is a modified form of Equation 3.
  • the slot number n s in Equation 3 represents a subframe number Changed to. That is, according to Equation 11, the group hopping pattern f gh (n s ) may be determined in units of subframes.
  • the basic sequence number v in the basic sequence group in the slot n s may be determined by Equation 4 as it is. However, in Equation 4, the basic sequence number v in the basic sequence group is determined for each slot. When the OCC is not required, Equation 4 is the basic sequence only for one of two slots in one subframe. It can be interpreted that the base sequence number v in the group is determined.
  • Equation 12 is a modified form of Equation 4.
  • Equation 12 is a slot number n s in Equation 4 represents a subframe number Changed to. That is, according to Equation 12, the base sequence number v in the base sequence group in slot n s may be determined in units of subframes.
  • the parameter n PN (n s ) related to the CSH may be determined by Equation 7 as it is. However, in Equation 7, the parameter n PN (n s ) related to the CSH is determined for every slot. When the OCC is not required, Equation 7 is used only for one slot of two slots in one subframe. The associated parameter n PN (n s ) can be interpreted to be determined.
  • Equation 13 is a modified form of Equation 7.
  • Equation 13 is a slot number n s in Equation 7 represents a subframe number Changed to. That is, according to Equation 13, a parameter n PN (n s ) related to CSH may be determined in units of subframes.
  • Table 1 indicating a mapping relationship between the cyclic shift field in the uplink DCI and n DMRS, ⁇ (2) of each layer and the OCC applied to each layer may be used as it is.
  • OCC is applied to every slot.
  • OCC may be applied to only one slot of two slots in one subframe. It can be used, for example, manyi w ( ⁇ ) (0) of w ( ⁇ ) (0) and w ( ⁇ ) (1) in Table 1.
  • the value of w ( ⁇ ) (0) is always 1
  • the value of w ( ⁇ ) (1) is either 1 or -1, and only w ( ⁇ ) (0) is used, so The value can always be 1.
  • mapping relationship between the cyclic shift field in the uplink DCI and n DMRS, ⁇ (2) of each layer may be determined by Table 3.
  • Table 3 is a modified form of Table 1.
  • Table 3 shows only the mapping relationship between the cyclic shift field in uplink DCI and n DMRS, ⁇ (2) of each layer except for OCC in Table 1. That is, since the OCC of the same value may always be applied when the application of the OCC is not necessary, only a mapping relationship between the cyclic shift field in the uplink DCI and n DMRS, ⁇ (2) of each layer may be required.
  • mapping relationship between the cyclic shift field in the uplink DCI and n DMRS, ⁇ (2) of each layer and the OCC applied to each layer in consideration of both the case where application of the OCC is required and the case where the application of the OCC is not required.
  • Table 4 showing may be applied. Table 4 will be described later.
  • the UE does not know whether or not it is an MU-MIMO UE constituting the MU-MIMO environment. That is, the UE is transparent as to whether it is a MU-MIMO UE.
  • the configuration method of the PUSCH DMRS may vary depending on whether the OCC is applied. Therefore, the base station needs to inform the UE whether the application of the OCC is necessary.
  • the base station determines whether the application of the OCC is required and signals it to the UE, the UE configures the PUSCH DMRS according to whether the application of the OCC is required and transmits it to the base station.
  • the base station estimates a channel using the received PUSCH DMRS and demodulates the PUSCH based on the estimated channel.
  • the base station may explicitly inform the UE whether the OCC is applied. That is, the base station may signal to the UE whether OCC is applied through 1 bit added in the DCI. Accordingly, the UE can dynamically know whether OCC is applied.
  • the PUSCH DMRS may be configured and transmitted through two SC-FDMA symbols in one subframe as in the prior art. That is, Equations 1, 2, 3, 4, 5, 6, 7, and 1 may be used to configure the PUSCH DMRS.
  • a value of 1 bit added in the DCI is 1 (or 0)
  • the conventional PUSCH DMRS can be configured and transmitted through only one SC-FDMA symbol in one subframe. That is, in order to configure the PUSCH DMRS, Equation 1, Equation 2, Equation 3 (or Equation 11), Equation 4 (or Equation 12), Equation 9 (or Equation 10), Equation 6, Equation 7 (or Equation 13), Table 1 (or Table 3), or the like may be used.
  • the base station may implicitly inform the UE whether the OCC is applied. That is, the base station may implicitly signal to the UE whether OCC is applied through the 3-bit cyclic shift field defined in the current DCI. More specifically, some of the eight values indicated by the 3-bit cyclic shift field (first group) are used when the OCC is applied, and others are used when the OCC does not need to be applied. Can be used. That is, the UE reads the cyclic shift field in the DCI and knows that the OCC is applied when the value belongs to the first group. In addition, the UE reads the cyclic shift field in the DCI and knows that the OCC is not applied when the value belongs to the second group.
  • the first group indicating that the OCC is applied may include a cyclic shift field whose values are 011, 100, 101, and 110.
  • the UE reads the cyclic shift field in the DCI and knows that the OCC is applied when the value is any one of 001, 100, 101, and 110.
  • the PUSCH DMRS may be configured and transmitted through two SC-FDMA symbols in one subframe as in the prior art. That is, in order to configure the PUSCH DMRS, Equation 1, Equation 2, Equation 3, Equation 4, Equation 5, Equation 6, Equation 7, and Table 1 (or Table 4 to be described later) may be used. .
  • the second group indicating that the OCC is not applied may include a cyclic shift field whose values are 000, 001, 010, and 111.
  • the UE reads the cyclic shift field in the DCI and knows that the OCC is not applied when the value is any one of 000, 001, 010, and 111. Accordingly, as in the conventional PUSCH DMRS can be configured and transmitted through only one SC-FDMA symbol in one subframe.
  • Equation 1 Equation 2, Equation 3 (or Equation 11), Equation 4 (or Equation 12), Equation 9 (or Equation 10), Equation 6, Equation 7 (or Equation 13), Table 1 (or Table 3, or Table 4 to be described later) may be used.
  • the cyclic shift field in the uplink DCI and n DMRS, ⁇ (2) of each layer and each layer are applied according to Table 4 according to Table 4 It may indicate a mapping relationship of the OCC.
  • N / A indicates that OCC is not applied. That is, according to Table 4, when the value of the cyclic shift field is any one of 011, 100, 101, and 110, it is indicated that OCC is applied, and the value of the cyclic shift field is one of 000, 001, 010, and 111. It may be indicated that the OCC does not apply.
  • the first group includes a cyclic shift field whose values are 011, 100, 101, and 110
  • the second group includes a cyclic shift field whose values are 000, 001, 010, and 111.
  • one bit indicating whether the small cell environment is additionally signaled to the UE may be additionally signaled to the UE in consideration of an environment in which a small cell is not applied or in consideration of compatibility with an existing system.
  • One bit indicating whether the small cell environment is transmitted may be transmitted through higher layer signaling such as radio resource control (RRC) signaling or may be included in the DCI.
  • RRC radio resource control
  • Whether the base station and the UE are in the small cell environment may be indicated through 1 bit indicating whether the small cell environment exists.
  • whether the small cell environment is implicit may be determined according to a transmission mode instead of 1 bit indicating whether the small cell environment is present.
  • the configuration and transmission method of the PUSCH DMRS may vary depending on whether the application of the OCC is required.
  • a PUSCH DMRS may be configured and transmitted by applying OCC as in the conventional method.
  • FIG. 7 shows an embodiment of a method of transmitting a reference signal according to an embodiment of the present invention.
  • the base station may explicitly signal indication information indicating whether to apply an orthogonal sequence to the UE or implicitly signal according to a cyclic shift field in the DCI.
  • the UE In step S110, the UE generates a reference signal sequence.
  • the reference signal sequence may be configured through two SC-FDMA symbols in one subframe or one SC-FDMA symbol in one subframe depending on whether orthogonal sequences are applied. That is, when an orthogonal sequence is applied, a reference signal sequence may be generated by Equation 1, Equation 2, Equation 3, Equation 4, Equation 5, Equation 6, Equation 7, Table 1, or the like. When the orthogonal sequence is not applied, Equation 1, Equation 2, Equation 3 (or Equation 11), Equation 4 (or Equation 12), Equation 9 (or Equation 10), Equation 6, A reference signal sequence may be generated by Equation 7 (or Equation 13), Table 1 (or Table 3), or the like.
  • the base station may explicitly signal whether the orthogonal sequence is applied to the UE or implicitly signal according to the cyclic shift field in the DCI.
  • step S120 the UE performs precoding on the generated reference signal sequence.
  • the UE maps the precoded reference signal sequence to the resource element.
  • the reference signal sequence may be mapped to two SC-FDMA symbols in one subframe. If the orthogonal sequence is not applied, the reference signal sequence may be mapped to one SC-FDMA symbol in one subframe.
  • step S140 the UE transmits the SC-FDMA signal generated based on the reference signal sequence mapped to the resource element to the base station.
  • the base station receives the SC-FDMA signal, demodulates it, and performs channel estimation.
  • the base station demodulates the PUSCH based on the estimated channel.
  • the procedure for demodulating the SC-FDMA signal may be the reverse of the procedure for generating the SC-FDMA signal.
  • the base station de-maps the received SC-FDMA signal to the resource element to detect the reference signal sequence.
  • the base station performs channel estimation by comparing the detected reference signal sequence with the reference signal sequence generated by the base station itself.
  • FIG. 8 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
  • the terminal 800 includes a processor 810, a transmitter 820, and a receiver 830.
  • the processor 810 includes a reference signal generator 811 and a resource mapper 812.
  • the reference signal generator 811 is configured to generate a reference signal sequence.
  • the reference signal sequence may be configured through two SC-FDMA symbols in one subframe or one SC-FDMA symbol in one subframe depending on whether orthogonal sequences are applied. That is, when an orthogonal sequence is applied, a reference signal sequence may be generated by Equation 1, Equation 2, Equation 3, Equation 4, Equation 5, Equation 6, Equation 7, Table 1, or the like. When the orthogonal sequence is not applied, Equation 1, Equation 2, Equation 3 (or Equation 11), Equation 4 (or Equation 12), Equation 9 (or Equation 10), Equation 6, A reference signal sequence may be generated by Equation 7 (or Equation 13), Table 1 (or Table 3), or the like.
  • the base station may explicitly signal whether the orthogonal sequence is applied to the UE or implicitly signal according to the cyclic shift field in the DCI.
  • the resource mapper 812 is configured to precode the generated reference signal sequence and to map the precoded reference signal sequence to resource elements.
  • the reference signal sequence may be mapped to two SC-FDMA symbols in one subframe. If the orthogonal sequence is not applied, the reference signal sequence may be mapped to one SC-FDMA symbol in one subframe.
  • the transmitter 820 is configured to transmit the SC-FDMA signal generated based on the reference signal sequence mapped to the resource elements to the base station 900.
  • the receiver 830 is configured to receive, from the base station 900, indication information indicating whether or not to apply the orthogonal sequence.
  • the indication information indicating whether the orthogonal sequence is applied may be explicitly signaled or implicitly signaled according to a cyclic shift field in the DCI.
  • the base station 900 includes a PUSCH demodulator 910, a transmitter 920, and a receiver 930.
  • the receiver 930 is configured to receive an SC-FDMA signal from the terminal 800.
  • the PUSCH demodulator 910 is configured to demodulate the received SC-FDMA signal to perform channel estimation and to demodulate the PUSCH based on the estimated channel.
  • the procedure for demodulating the SC-FDMA signal may be the reverse of the procedure for generating the SC-FDMA signal.
  • the base station de-maps the received SC-FDMA signal to resource elements to detect the reference signal sequence.
  • the base station performs channel estimation by comparing the detected reference signal sequence with the reference signal sequence generated by the base station itself.
  • the transmitter 920 is configured to transmit the indication information indicating whether or not to apply the orthogonal sequence to the terminal 800.

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Abstract

La présente invention porte sur un procédé et un appareil pour émettre un signal de référence dans un système de communication sans fil. Un équipement utilisateur (UE) génère une séquence de signal de référence selon qu'il faut appliquer ou non une séquence orthogonale, comme indiqué par une station de base, et mappe la séquence de signal de référence à des éléments de ressource (RE) et émet la séquence de signal de référence, selon qu'il faut appliquer ou non la séquence orthogonale. Lorsqu'il y a une instruction d'appliquer la séquence orthogonale, la séquence de signal de référence est mappée aux éléments de ressource inclus dans deux symboles d'accès multiple par répartition en fréquence monoporteuse (SC-FDMA) dans une seule sous-trame. En outre, lorsqu'il y a une instruction de ne pas appliquer la séquence orthogonale, la séquence de signal de référence est mappée aux éléments de ressource inclus dans un seul symbole SC-FDMA dans une seule sous-trame.
PCT/KR2014/006287 2013-07-11 2014-07-11 Procédé et appareil d'émission de signal de référence dans un système de communication sans fil Ceased WO2015005739A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111954984A (zh) * 2018-02-15 2020-11-17 株式会社Ntt都科摩 用户终端以及无线通信方法
CN114285714A (zh) * 2017-06-16 2022-04-05 华为技术有限公司 相位跟踪参考信号处理方法与装置
CN114884640A (zh) * 2016-03-31 2022-08-09 北京三星通信技术研究有限公司 通信系统中的终端、基站及其方法
CN116846505A (zh) * 2017-11-26 2023-10-03 华为技术有限公司 一种序列确定方法和装置
WO2025139777A1 (fr) * 2023-12-28 2025-07-03 华为技术有限公司 Procédé et appareil de communication

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3340709A4 (fr) * 2015-08-21 2018-12-26 Ntt Docomo, Inc. Terminal utilisateur, station de base sans fil et procédé de communication sans fil
US12335185B2 (en) * 2019-11-27 2025-06-17 Electronics And Telecommunications Research Institute Method and apparatus for transmitting and receiving signal using orthogonal sequence in communication system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100086431A (ko) * 2009-01-22 2010-07-30 엘지전자 주식회사 다중안테나를 사용하는 송신기에서 참조신호 전송방법
KR20110048429A (ko) * 2009-11-02 2011-05-11 주식회사 팬택 복수의 셀 고유 ｄｍ―ｒｓ 생성방법 및 그를 이용하는 통신단말장치와 기지국 장치
WO2012033335A2 (fr) * 2010-09-08 2012-03-15 엘지전자 주식회사 Procédé et dispositif de transmission d'informations de commande dans un système de communication sans fil
WO2013025054A2 (fr) * 2011-08-16 2013-02-21 엘지전자 주식회사 Procédé et appareil pour émettre un signal de référence de liaison montante dans un système de communication sans fil
WO2013073832A1 (fr) * 2011-11-17 2013-05-23 엘지전자 주식회사 Procédé et dispositif d'échange de données dans un système de communication sans fil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100086431A (ko) * 2009-01-22 2010-07-30 엘지전자 주식회사 다중안테나를 사용하는 송신기에서 참조신호 전송방법
KR20110048429A (ko) * 2009-11-02 2011-05-11 주식회사 팬택 복수의 셀 고유 ｄｍ―ｒｓ 생성방법 및 그를 이용하는 통신단말장치와 기지국 장치
WO2012033335A2 (fr) * 2010-09-08 2012-03-15 엘지전자 주식회사 Procédé et dispositif de transmission d'informations de commande dans un système de communication sans fil
WO2013025054A2 (fr) * 2011-08-16 2013-02-21 엘지전자 주식회사 Procédé et appareil pour émettre un signal de référence de liaison montante dans un système de communication sans fil
WO2013073832A1 (fr) * 2011-11-17 2013-05-23 엘지전자 주식회사 Procédé et dispositif d'échange de données dans un système de communication sans fil

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114884640A (zh) * 2016-03-31 2022-08-09 北京三星通信技术研究有限公司 通信系统中的终端、基站及其方法
CN114285714A (zh) * 2017-06-16 2022-04-05 华为技术有限公司 相位跟踪参考信号处理方法与装置
CN114285714B (zh) * 2017-06-16 2024-05-14 华为技术有限公司 相位跟踪参考信号处理方法与装置
CN116846505A (zh) * 2017-11-26 2023-10-03 华为技术有限公司 一种序列确定方法和装置
US11902200B2 (en) 2017-11-26 2024-02-13 Huawei Technologies Co., Ltd. Sequence determining method and apparatus
CN116846505B (zh) * 2017-11-26 2024-04-23 华为技术有限公司 一种序列确定方法和装置
US12095694B2 (en) 2017-11-26 2024-09-17 Huawei Technologies Co., Ltd. Sequence determining method and apparatus
CN111954984A (zh) * 2018-02-15 2020-11-17 株式会社Ntt都科摩 用户终端以及无线通信方法
WO2025139777A1 (fr) * 2023-12-28 2025-07-03 华为技术有限公司 Procédé et appareil de communication

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