WO2013147430A1 - Procédé et appareil d'émission-réception de signal de référence dans un système de communication sans fil - Google Patents

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

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Publication number
WO2013147430A1
WO2013147430A1 PCT/KR2013/001791 KR2013001791W WO2013147430A1 WO 2013147430 A1 WO2013147430 A1 WO 2013147430A1 KR 2013001791 W KR2013001791 W KR 2013001791W WO 2013147430 A1 WO2013147430 A1 WO 2013147430A1
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Prior art keywords
random sequence
reference signal
pseudo random
subframe
indication information
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PCT/KR2013/001791
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English (en)
Korean (ko)
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윤성준
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주식회사 팬택
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Publication of WO2013147430A1 publication Critical patent/WO2013147430A1/fr

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    • 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
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting and receiving a reference signal in a wireless communication system.
  • various reference signals are used to provide information on a communication environment to the counterpart device through uplink or downlink.
  • Multi-cell cooperation has been introduced to increase the performance and communication capacity of a wireless communication system.
  • Multi-cell cooperation is also known as cooperative multiple point transmission and reception (CoMP).
  • CoMP includes a beam avoidance technique in which neighboring cells cooperate to mitigate interference to a user at a cell boundary, and a joint transmission technique in which neighboring cells cooperate to transmit the same data.
  • Next-generation wireless communication systems such as Institute of Electrical and Electronics Engineers (IEEE) 802.16m or 3rd Generation Partnership Project (3GPP) long term evolution (LTE) -Advanced, are located at cell boundaries and are subject to severe interference from adjacent cells.
  • IEEE Institute of Electrical and Electronics Engineers
  • 3GPP 3rd Generation Partnership Project
  • LTE long term evolution
  • CoMP can be considered.
  • Various scenarios are possible with this CoMP.
  • MU-MIMO multi-user multi-input multi-output
  • the present invention provides each UE or signal in transmitting / receiving an uplink reference signal used for estimating a channel state of a user equipment (hereinafter referred to as UE) by a transmission / reception point such as a cell or an evolved NodeB (eNodeB).
  • UE user equipment
  • eNodeB evolved NodeB
  • every radio radio frame Disclosed are a method and apparatus for overcoming the problems of the prior art in which dynamic switching or semi-static reconstruction of a reference signal cannot be performed quickly by initializing an initialization value for generating a sequence for each radio frame.
  • An object of the present invention is to provide a method and apparatus for transmitting and receiving a reference signal and a signal signaling method therefor.
  • Another object of the present invention is to provide an apparatus and method for generating a specific uplink RS sequence by a UE in a CoMP system.
  • the UE when a UE transmits an uplink reference signal, the UE dynamically switches to selectively generate and transmit a reference signal among two types of reference signals according to a communication environment, or is specialized for each UE (UE). It relates to a method of quasi-static reconfiguration to transmit a reference signal.
  • Another object of the present invention is to change a reference signal sequence dynamically when a UE dynamically switches a reference signal among two types of reference signals or semi-statically reconfigures a UE-specific reference signal according to a communication environment. It is to provide a method that is performed quasi-statically.
  • Another object of the present invention is a demodulation reference signal (DM-RS) or a sounding reference signal (SRS), which is determined by one or two parameter sets.
  • DM-RS demodulation reference signal
  • SRS sounding reference signal
  • a method of dynamically or semi-statically generating a corresponding DM-RS or SRS sequence according to indication information for selecting or reconfiguring a parameter set is provided.
  • Another object of the present invention is to provide a signal indicating one of two parameter sets or one parameter set in dynamically switching or quasi-statically reconfiguring a reference signal such as uplink DM-RS or SRS according to a communication environment.
  • signaling indicating reconfiguration a method of immediately changing a pseudo random sequence for a reference signal such as DM-RS or SRS in a subframe requiring dynamic switching or quasi-static reconfiguration is provided.
  • Another object of the present invention is to initialize a pseudo random sequence used for a reference signal such as DM-RS or SRS in dynamically switching or quasi-statically reconfiguring a reference signal such as uplink DM-RS or SRS according to a communication environment.
  • the present invention provides a method of changing a value and correspondingly transmitting a reference signal such as a DM-RS or an SRS, instead of being performed every radio frame, but in a corresponding subframe.
  • an embodiment of the present invention provides a method for receiving at least one of two parameter sets for two types of reference signals from a transmission and reception point, and for generating the reference signal among the two parameter sets.
  • the present invention in order to dynamically select a sequence of reference signals, constructing one or more pieces of information from two parameter sets for two types of reference signals and transmitting them to the UE, and among the two parameter sets, Generating indication information indicating a parameter set to be used for generating the reference signal and transmitting the indication information to the UE; and the changed initialization value in a subframe in which an initialization value of a pseudo random sequence for the reference signal is changed by the indication information. It provides a reference signal receiving method comprising the step of receiving a reference signal generated and transmitted by the UE, and measuring the channel state of the UE from the received reference signal.
  • Another embodiment of the present invention is an apparatus for transmitting a reference signal in a wireless communication system, comprising: a parameter set information receiving unit for receiving one or more pieces of information of two parameter sets for two types of reference signals from a transmission / reception point; An instruction information receiver for dynamically receiving instruction information indicating a parameter set to be used for generating a reference signal among the two parameter sets, a pseudo random sequence generator for generating a pseudo random sequence according to the parameter set indicated by the instruction information; A reference signal processor configured to generate and transmit a reference signal by using the generated pseudo random sequence, wherein the pseudo random sequence generator comprises the initialization value changed in a subframe in which an initialization value of a pseudo random sequence is changed by the indication information; Generate the pseudo random sequence based on Provides a reference signal transmission apparatus.
  • Another embodiment of the present invention is an apparatus for receiving a reference signal in a wireless communication system, comprising: a parameter set information processing unit for generating one or more pieces of information of two parameter sets for dynamic switching of the reference signal and transmitting the same to the UE; An instruction information processing unit for dynamically generating indication information indicating a parameter set to be used for generating a reference signal among the two parameter sets and transmitting the indication information to a UE; A reference signal receiver including a reference signal receiver configured to receive a reference signal generated and transmitted by a UE based on the changed initialization value in a frame, and a channel state measurer configured to measure a channel state of the corresponding UE from the received reference signal; to provide.
  • Another embodiment of the present invention is a method for transmitting a reference signal in a wireless communication system.
  • Another embodiment of the present invention is a method of receiving a reference signal in a wireless communication system
  • FIG. 1 illustrates a communication system to which embodiments of the present invention are applied.
  • FIG. 2 illustrates an example of a method of transmitting a PUSCH, a DM-RS, and an SRS in an uplink of a wireless mobile communication.
  • FIG. 3 is an enlarged view of a DM-RS 202 for a UE UE1 shown in FIG. 2 on a subcarrier basis.
  • Figure 4 is a structural diagram of a pseudo random sequence generator that can be applied to an embodiment of the present invention.
  • FIG. 5 illustrates a pseudo random sequence generation method for transmitting a reference signal according to the first method of the present invention.
  • FIG. 6 shows a pseudo random sequence generation method for transmitting a reference signal according to the second method of the present invention.
  • FIG. 7 is a flowchart illustrating a method of transmitting and receiving a reference signal according to an embodiment of the present invention.
  • FIG. 8 is a functional block diagram of a reference signal transmission apparatus according to an embodiment of the present invention.
  • FIG. 9 is a functional block diagram of a reference signal reception and channel measurement apparatus according to an embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a method of transmitting and receiving a reference signal according to another embodiment of the present invention.
  • FIG. 11 is a functional block diagram of a reference signal transmission apparatus according to an embodiment of the present invention.
  • FIG. 12 is a functional block diagram of a reference signal reception and channel measurement apparatus according to an embodiment of the present invention.
  • FIG. 1 illustrates a communication system to which embodiments of the present invention are applied.
  • Communication systems are widely deployed to provide various communication services such as voice, packet data, and the like.
  • a communication system includes a transmission / reception point 20 for performing uplink and downlink communication with a user equipment 10 (hereinafter referred to as a “terminal” or “UE”) and a user equipment 10. Point).
  • UE user equipment 10
  • Point a user equipment 10. Point
  • the terminal 10 or the UE is a comprehensive concept meaning a user terminal in wireless communication.
  • a user terminal in addition to the UE in WCDMA, LTE, and HSPA, as well as a mobile station (MS) in GSM, a user terminal (UT), It should be interpreted as a concept that includes both a subscriber station (SS), a wireless device, and the like.
  • a transmission / reception point 20 or a cell generally refers to a station communicating with the terminal 10, and includes a base station, a Node-B, an evolved Node-B, and a base transceiver. It may be called other terms such as a System, an Access Point, a Relay Node, and the like.
  • a transmission / reception point 20 or a cell is to be interpreted in a comprehensive sense indicating a part of a region covered by a base station controller (BSC) in a CDMA, a NodeB of a WCDMA, and the like.
  • BSC base station controller
  • Comprehensive means any type of device that can communicate with a single terminal, such as a head, relay node, a sector of a macro cell, a site, or a micro cell such as a femtocell or picocell. Used as a concept.
  • the terminal 10 and the transmission / reception point 20 are used in a generic sense as a transmission / reception subject used to implement the technology or technical idea described in the present specification and are not limited to the terms or words specifically referred to.
  • One transmission / reception point 20 may communicate with a plurality of terminals 10, and one terminal 10 may communicate with one transmission / reception point 20.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • OFDM-FDMA OFDM-FDMA
  • OFDM-TDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • the uplink transmission and the downlink transmission are a time division duplex (TDD) scheme transmitted using different times, a frequency division duplex (FDD) scheme transmitted using different frequencies, and TDD. It is applicable to a hybrid duplexing scheme in which FDD is combined.
  • TDD time division duplex
  • FDD frequency division duplex
  • embodiments of the present invention are applicable to asynchronous wireless communication that evolves into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB.
  • LTE Long Term Evolution
  • WCDMA Long Term Evolution-advanced through GSM
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High Speed Packet Access
  • CDMA Code Division Multiple Access
  • CDMA-2000 Code Division Multiple Access-2000
  • UMB Universal Mobile Broadband
  • the terminal 10 and a transmission / reception point 20 may perform uplink and downlink wireless communication.
  • one radio radio frame may consist of 10 subframes, and one subframe may consist of two slots.
  • the radio frame may have a length of 10 ms, and the subframe may have a length of 1.0 ms.
  • the basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis.
  • One slot includes seven symbols (in the case of a normal cyclic prefix) or six symbols (in the case of an extended cyclic prefix) in the time domain.
  • the time-frequency domain defined by 12 subcarriers corresponding to 180 kHz in the frequency domain with one slot in the time domain may be referred to as a resource block (RB), but is not limited thereto.
  • the transmission / reception point 20 may perform downlink transmission to the terminal 10.
  • the transmission / reception point 20 may transmit a physical downlink shared channel (hereinafter, referred to as “PDSCH”) as a downlink data channel for unicast transmission.
  • PDSCH physical downlink shared channel
  • the transmission / reception point 20 may be configured in downlink control information such as scheduling required for reception of a PDSCH and an uplink data channel (for example, a physical uplink shared channel (hereinafter referred to as a PUSCH)).
  • a PUSCH physical uplink shared channel
  • Physical Downlink Control Channel as a Downlink Control Channel used for transmitting Downlink Control Information (DCI) including scheduling grant information for transmission PDCCH '), a physical control format indicator channel (PCFICH) for transmitting an indicator for distinguishing a region of PDSCH and PDCCH, and transmission of a hybrid automatic repeat request (HARQ) acknowledgment for uplink transmission.
  • DCI Downlink Control Information
  • PCFICH physical control format indicator channel
  • HARQ hybrid automatic repeat request
  • a control channel such as a physical HARQ indicator channel (PHICH) may be transmitted.
  • PHICH physical HARQ indicator channel
  • the terminal 10 may perform uplink transmission to the transmission / reception point 20.
  • the terminal 10 may transmit a PUSCH as an uplink data channel.
  • the terminal 10 requests resource allocation when transmitting data in HARQ acknowledgment (NACK) / negative ACK (NACK), channel status report, and uplink indicating whether the downlink transport block has been successfully received.
  • NACK HARQ acknowledgment
  • NACK negative ACK
  • a physical uplink control channel (hereinafter, referred to as a PUCCH) as an uplink control channel used for transmitting uplink control information (UCI) including a scheduling request may be transmitted.
  • PUCCH physical uplink control channel
  • the transmission / reception point 20 includes a cell-specific reference signal (CRS), a MBSFN reference signal (Multicast / Broadcast over Single Frequency Network Reference Signal, MBSFN-RS), and a UE-specific reference signal (UE) in downlink.
  • CRS cell-specific reference signal
  • MBSFN-RS Multicast / Broadcast over Single Frequency Network Reference Signal
  • UE UE-specific reference signal
  • Specific Reference Signal, Positioning Reference Signal (PRS), and CSI Reference Signal Channel Status Information Reference Signal, CSI-RS
  • the terminal 10 may transmit a demodulation reference signal (DM-RS) and a sounding reference signal (SRS) in uplink.
  • DM-RS demodulation reference signal
  • SRS sounding reference signal
  • FIG. 2 illustrates an example of a method of transmitting a PUSCH, a DM-RS, and an SRS in an uplink of a wireless mobile communication.
  • the horizontal axis represents a symbol on the time axis and represents one subframe as a whole.
  • the vertical axis represents a resource block (RB) on the frequency axis.
  • each UE UE1 to UE3 may transmit the PUSCHs 201, 203, and 205 through a resource block indicated by the DCI for each UE UE1 to UE3.
  • the DM-RSs 202, 204, and 206 which are reference signals used to demodulate the PUSCHs 201, 203, and 205 transmitted by the UEs UE1 to UE3, are PUSCHs 201, 203, and 205 on the frequency axis.
  • the time axis may be transmitted in one symbol of each of two slots in a subframe.
  • the SRS 207 transmitted by the terminals may be transmitted in the last symbol of the subframe.
  • DM-RS (202, 204, 206) is associated with PUSCH 201, 203, 205 transmission or PUCCH transmission (DM-RS associated with PUSCH transmission is shown in Figure 2), channel measurement for demodulation (channel It is mainly transmitted for estimation.
  • the DM-RSs 202, 204, and 206 are transmitted for every slot in every subframe in which the PUSCHs 201, 203, and 205 are transmitted.
  • the information on the transmission bandwidth (BW) of the DM-RSs 202, 204, and 206 expressed in resource block units is associated with PUSCH 201, 203, and 205 transmission or PUCCH transmission.
  • BW transmission bandwidth
  • the DM-RSs 202, 204, and 206 associated with the PUSCHs 201, 203, and 205 the DM-RSs 202, 204 in the resource blocks to which the PUSCHs 201, 203, and 205 are allocated. 206 is transmitted. Accordingly, the resource block allocation information of the DM-RS is based on the resource block allocation information of the PUSCH. At this time, the resource blocks to which the PUSCHs 201, 203, and 205 are allocated for each UE UE1 to UE3 are based on a field value for resource block allocation of the DCI.
  • FIG. 3 is an enlarged view of a DM-RS 202 for a UE UE1 shown in FIG. 2 on a subcarrier basis.
  • the current DM-RS sequence is mapped and transmitted for all subcarriers in the resource block used for DM-RS transmission.
  • the DM-RS sequence is a base sequence based on the Zadoff-Chu sequence as shown in Equation 1 below.
  • the base sequence may be generated differently for each cell and for each slot (that is, u and v values of the base sequence may vary according to a cell ID and a slot number in a subframe), and a cyclic delay (CS) value May be generated differently for each UE and layer.
  • CS cyclic delay
  • the u value of the aforementioned basic sequence is called a sequence-group number, and is determined by Equation 2 below.
  • the sequence-group number u value is obtained by adding a group hopping pattern fgh (ns) and a sequence-shift pattern fss and then performing a modular 30 operation. You can get 30 values from 0 to 29.
  • the group hopping pattern fgh (ns) has a value of 0 when group hopping is disabled and a cell ID (when group hopping is enabled). ) And the slot number (ns) determine the value.
  • the sequence-shift pattern fss is defined separately in the DM-RS for PUCCH and the DM-RS for PUSCH.
  • a cell ID ( ) In the case of DM-RS for PUCCH, a cell ID ( ), According to the DM-RS for PUSCH cell ID ( ) And the value ⁇ ss, which is signaled at the upper end, is determined.
  • the pseudo random sequence c (i) is defined by the 31st order gold sequence, and the pseudo random sequence generator is generated at the beginning of every radio frame. Should be initialized to
  • the v value of the aforementioned base sequence is called a base sequence number in the sequence-group, and is determined by Equation 3 below. As shown in Equation 3, the v value of the base sequence is determined only by the cell ID (group hopping) when group hopping is disabled and sequence hopping is enabled. ) And slot number (ns) and Equation 2 It is determined by the value, in other cases it has a value of zero.
  • the pseudo random sequence c (i) is defined by the 31st order gold sequence, and the pseudo random sequence generator is generated at the beginning of every radio frame. Should be initialized to
  • ncs, ⁇ which is used to calculate the cyclic delay (CS) value, is obtained by performing a modular 12 operation on a total of three parameter values as shown in Equation 1. The value is transmitted differently for each UE, which is transmitted through a 3-bit value included in the DCI. Meanwhile, Is a 3-bit cyclic shift offset parameter that is cell-specifically transmitted.
  • nPN (ns) associated with cyclic shift hopping hereinafter referred to as 'CSH') is defined as Equation 4 below.
  • the pseudo random sequence c (i) is defined by the 31st order gold sequence, and the pseudo random sequence generator is generated at the beginning of every radio frame. Should be initialized to
  • orthogonal sequences used when generating DM-RS sequences
  • CoMP has a CoMP scenario 1/2/3 environment having different cell IDs between transmission and reception points, and a CoMP scenario 4 environment having identical cell IDs between transmission and reception points.
  • inter-cell (or inter-point) orthogonality is guaranteed when transmitting an uplink reference signal with respect to the UE depending on whether the UE is at the cell edge and whether CoMP is applied or CoMP scenario.
  • orthogonality between cells (or points) is not necessary, pseudo randomization for inter-cell (or inter-point) interference randomization or It may be in a quasi-orthogonality state.
  • the basic sequence of the DM-RS when the UE transmits the uplink DM-RS, in order to ensure orthogonality between cells, the basic sequence of the DM-RS must be the same, orthogonality through different CS or orthogonal sequence (OCC), such as Table 1 described above Can be secured. On the contrary, in the pseudo-random or point-to-point orthogonal state between points, the basic sequence of DM-RS should be different.
  • a first mode in which UEs generate identical DM-RS basic sequences and different DM-RS basic sequences between UEs such as pseudo random or quasi-orthogonal states are used.
  • a second mode to generate is used, and the first and second modes can be further subdivided according to the CoMP scenario.
  • the CoMP scenario is 1/2/3
  • a common base sequence in the CoMP set should be generated.
  • the cell ID is basically used. Since are different from each other, common parameters for generating a common DM-RS sequence should be signaled to the UE separately.
  • the cell ID is the same CoMP scenario 4, it is sufficient to generate a DM-RS sequence based on the cell or the transmission and reception point to which the UE belongs, as in the current method (for example, LTE Release 10). That is, in CoMP scenario 4, since cell IDs between transmitting and receiving points are the same, even if a base sequence is generated in a current cell-specific manner, the same base sequence can be generated.
  • two parameter sets may be defined and used for dynamic switching between the first mode and the second mode according to the communication environment, and one parameter set for the quasi-static reconstruction between the first mode and the second mode.
  • Is defined and the values of parameters belonging to the parameter set may be indicated by higher level signaling such as RRC.
  • a method of defining two parameter sets (set A and set B) for the first mode and the second mode may be implemented as follows, but is not limited thereto.
  • the two parameter sets are used for dynamic switching between the first mode and the second mode, so that the values of the parameters in each parameter set are equal to RRC or the like.
  • DCI dynamic signaling
  • the values of parameters in one parameter set are indicated by higher-level signaling such as RRC.
  • the values of the parameters in the parameter set may be reconfigured and indicated by higher level signaling such as RRC. That is, after the values of parameters belonging to one of the parameter set A (or the first parameter set) and the parameter set B (or the second parameter set) to be mentioned below are indicated by higher-level signaling such as RRC, the change is performed.
  • the values of parameters in the parameter set may be reconfigured and indicated by higher-level signaling such as RRC.
  • the values of the parameters corresponding to the parameter set A are indicated by higher level signaling such as RRC
  • the values of the parameters corresponding to the parameter set B can be indicated by higher level signaling such as RRC. It can be.
  • the parameter set A or the first parameter set may be defined as a parameter set for generating a basic sequence based on a cell to which a UE belongs or a transmission / reception point according to a current scheme (for example, LTE Release 10). Since the parameter set 1 may use the current cell ID as it is, it may be transmitted to the UE in the form of RRC signaling or the like, but may not be separately signaled because the information is already known to the UE.
  • a current scheme for example, LTE Release 10
  • the parameter set B or the second parameter set is different from a parameter such as a current cell ID, and is a parameter for generating a common basic sequence in the case of CoMP scenario 1/2/3 or UE-specific or in the case of CoMP scenario 4 It may be defined as a parameter for generating a transmission / reception point-specific different basic sequence. Since the parameter set B is not information currently known to the UE, the transmission / reception point must be separately configured and signaled to the UE by RRC or the like.
  • parameter set A is a parameter for generating a common basic sequence (that is, an existing parameter such as an existing cell ID in CoMP scenario 4, and CoMP Scenarios 1/2/3 are defined as parameters that must be configured separately, and parameter set B must be configured separately (ie, for CoMP scenario 4, to generate different base sequences that are UE-specific or unique to the transport point).
  • Parameter and may be defined as existing parameters such as an existing cell ID in CoMP scenario 1/2/3.
  • the transmission / reception point supports the aforementioned dynamic switching in generating the DM-RS.
  • the "instruction information" is configured to select which of the two types of parameter set to use and transmit to the UE.
  • Such indication information means the following contents according to a network configuration to which the UE belongs, for example, CoMP scenario 1/2/3 or CoMP scenario 4.
  • the indication information is UE-unique or point unique generated based on whether to use a common base sequence for inter-cell orthogonality or a cell (transmission / reception point) to which the UE belongs, as in the conventional scheme.
  • Information indicating whether to use a different basic sequence of the information which also indicates the corresponding parameter set of the two parameter sets.
  • the indication information uses a common basic sequence generated based on a cell (transmission / reception point) to which the UE belongs to secure orthogonality between cells according to a conventional scheme, or the UE-unique or Information indicating whether to use a different basic sequence unique to a point, and information indicating a corresponding parameter set among two parameter sets.
  • DM-RS Indication information indicating which of the two types of parameter sets (parameter set A and parameter set B) to be used may be dynamically transmitted to the UE.
  • indication information an additional 1 bit is inserted explicitly in the DCI to explicitly indicate, or a field indicated in association with the uplink DM-RS in the existing DCI (for example, the CS field of Table 1, RB assignment field, etc.) may be implicitly indicated. .
  • two parameter sets are configured at the same time and instructed to the UE, and only quasi-static switching of the uplink reference signal is performed.
  • one of two parameter sets is configured and its configuration can be changed upon reconfiguration.
  • each parameter set is a cell ID (the base sequence index). ), And offset ( ), The initial value for circular delay hopping ( ) And other parameters.
  • parameter sets A and B are each ⁇ , , ⁇
  • each parameter set and parameters in each parameter set are configured independently of each other, and some or all of the parameters may be transmitted to the UE through higher layer signaling such as RRC.
  • the parameter is a parameter in Equation 2 defining a method of generating a u value (sequence-group number) of the base sequence and a parameter in Equation 3 defining a method of generating a v value (base sequence number in the sequence-group) of the base sequence.
  • This parameter is applied in place of. If the value is generated based on the cell (transmission / reception point) to which the UE belongs, such as the current communication method (eg LTE Rel-10), It can have the same value as Alternatively, they may have a common value within the CoMP set or may be configured differently for UE-specific or unique transmission / reception points.
  • the parameter is a parameter ⁇ ss in Equation 2 which defines a method of generating the u value (sequence-group number) of the base sequence and a method of generating a v value (base sequence number in the sequence-group) of the base sequence. This parameter is applied in place of.
  • the value When the value is generated based on the cell (transmission / reception point) to which the UE belongs, as in LTE Rel-10, the value may have the same value as ⁇ ss. Alternatively, the terminal may have a common value within the CoMP set, or may be configured differently from each other or UE uniquely.
  • the parameter is a parameter applied in place of the parameter cinit in Equation 4, which defines a method of generating n PN (n s ) associated with cyclic delay hopping (CSH).
  • the value may have the same value as the existing cinit when generating cyclic delay hopping (CSH) based on the cell (transmission / reception point) to which the UE belongs, such as LTE Rel-10.
  • they may have values common in the CoMP set or may be configured differently from each other in a UE-specific or point-specific manner.
  • each parameter set is a virtual cell ID ( ) May be included only.
  • parameter sets A and B are each ⁇ ⁇
  • each parameter set and parameters in each parameter set are configured independently of each other, and some or all of the parameters may be transmitted to the UE through higher layer signaling such as RRC.
  • the parameters include Equation 2, which defines the method of generating the u value (sequence-group number) of the base sequence, and Equation 3, which defines the method of generating the v value (base sequence number in the sequence-group) of the base sequence, and cyclic delay hopping.
  • Equation 2 defines the method of generating the u value (sequence-group number) of the base sequence
  • Equation 3 which defines the method of generating the v value (base sequence number in the sequence-group) of the base sequence
  • cyclic delay hopping Parameter in equation (4) defining how to generate n PN (n s ) with respect to (CSH) Commonly applied parameters instead of.
  • the value is based on the cell (transmission / reception point) to which the UE belongs, such as LTE Rel-10, in case of generating basic sequence and cyclic delay hopping (CSH). It can have the same value as Alternatively, they may have values common in the CoMP set or may be configured differently from each other or UE-specific
  • the configuration of two types of parameter sets in the first method and the second method is just an example, and based on this, other parameters may be further added according to the use.
  • one or more independent parameters for the basic sequence and one or more independent parameters for cyclic delay hopping (CSH) should be included.
  • one independent parameter for the base sequence Parameters can be included in a parameter set, and are mentioned as one independent parameter for cyclic delay hopping (CSH).
  • the parameter may be included in the parameter set. At this point, The parameter may not be included in the parameter set.
  • CSH cyclic delay hopping
  • one or more commonly applied parameters for the basic sequence and the cyclic delay hopping will necessarily be included.
  • other parameters may be further added according to the use.
  • the pseudo-random sequence c (i) defined in Equations 2, 3 and 4 is a 31-order gold sequence as shown in Equation 5 below. It is generated based on the 31 Gold sequence, and the pseudo-random sequence generator is initialized at the beginning of every radio radio frame with an initialization value c init .
  • N c 1600
  • the initialization of the second m-sequence is denoted by with the value depending on the application of the sequence.)
  • Figure 4 is a structural diagram of a pseudo random sequence generator that can be applied to an embodiment of the present invention.
  • a pseudo-random sequence generator may be configured with two linear feedback shift registers (LFSRs).
  • LFSRs linear feedback shift registers
  • the second LFSR is a raw polynomial It is configured from 'and has the initial value c init which can have different values according to system information.
  • the initialization period of c init in Equation 2, Equation 3 and Equation 4 related to the uplink DM-RS sequence generation is every radio radio frame.
  • the two types of parameter sets (parameter sets A and B) for generating DM-RS between initialization periods are dynamically switched or in one case. If the values of the parameters in the parameter set (parameter set A or B) are quasi-statically reconfigured, a problem may arise in which no dynamic switching or quasi-static reconfiguration of the actual parameter set is applied until the start of the next radio radio frame.
  • the indication information indicating one of two parameter sets for two types of reference signals is dynamically changed. And generate a pseudo random sequence according to the parameter set indicated by the indication information using a pseudo random sequence generator, and then generate and transmit a reference signal using the generated pseudo random sequence.
  • the reference signal is generated and transmitted based on the changed initialization value in the subframe in which the change of the initialization value of the pseudo random sequence is to be generated.
  • a reference signal is generated and transmitted using a pseudo random sequence based on the same.
  • the reference signal is generated and transmitted based on the initialization value in the subframe in which the change of the initialization value of the pseudo random sequence should be generated by the quasi-static signaling of the meat set.
  • a method of generating and transmitting the reference signal based on the initialization value in the very subframe in which the change of the initialization value of the pseudo random sequence should be generated is performed.
  • Method and a second initialization method are performed.
  • the pseudo random sequence generator is initialized to an initialization value according to the parameter set indicated by the indication information, and the initialization of the pseudo random sequence generator is added to the start time of every radio frame, and thus the initialization value is changed. This is also done at the beginning of the subframe that should be generated.
  • the pseudo random sequence generator is configured independently for each parameter set, and each pseudo random sequence generator is each configured with two initialization values by the two parameter sets at the start of every radio frame. Initialization or application of the two initialization values by the two parameter sets is sequentially performed at the start of every radio frame through one pseudo random sequence generator, so that the corresponding subframes in which the initialization value should be changed are applied.
  • a pseudo random sequence is generated using a pseudo random sequence generator.
  • the subframe in which the change of the initialization value of the pseudo random sequence generator should occur is the UE after receiving the indication information for parameter selection and after a certain number of subframes (for example, four, etc.)
  • the n + 4th server frame means a subframe at which the dynamic switching of DM-RS transmission should be applied according to a parameter set according to the indication information. do. That is, it means the first subframe in which DM-RS switching should be actually performed in the UE according to the parameter set indication information according to the present invention.
  • This definition may be due to a delay between the time when the indication information is transmitted downlink and the time when the uplink reference signal should be newly generated and transmitted according to the indication information.
  • the pseudo random sequence initialization value should be actually changed without waiting for the start of the next radio frame.
  • a pseudo random sequence initialization value is changed (ie, initialization of a pseudo random sequence generator), and a dynamically switched DM-RS is transmitted through the same.
  • two pseudo random sequence initialization values of two parameter sets are generated in advance at the beginning of every radio frame, and dynamic switching of the reference signal DM-RS is performed based on the indication information.
  • one of two initialization values is selectively used to generate and transmit a reference signal.
  • an independent pseudo random sequence generator is configured for each parameter set.
  • an independent pseudo random sequence generator for each parameter set may be a physically different LFSR pair, and physically uses one LFSR pair, but calculates a pseudo random sequence initialization value by two parameter sets at the beginning of every radio frame.
  • a DM-RS signal may be generated and transmitted using the corresponding initialization value.
  • the values of parameters in a parameter set for an uplink reference signal may be transmitted through higher-level signaling such as RRC. Quasi-statically, using a pseudo random sequence generator to generate a pseudo random sequence according to the values of parameters in the parameter set indicated by the signaling information, and then generating and transmitting a reference signal using the generated pseudo random sequence In this case, the reference signal is generated and transmitted based on the changed initialization value in the same subframe where the initialization value of the pseudo random sequence should be generated by the signaling information.
  • the pseudo random sequence generator is initialized with an initialization value according to the values of parameters in the parameter set indicated by the signaling information, wherein initialization of the pseudo random sequence generator is performed for every radio frame.
  • the change of the initialization value is also made at the start time of the subframe in which the change should occur.
  • the pseudo random sequence when receiving higher-end signaling information such as RRC indicating values of parameters used for generating the uplink reference signal sequence, the pseudo random sequence is actually initialized without waiting until the start of the next radio frame.
  • the pseudo random sequence initialization value is changed (that is, initialization of the pseudo random sequence generator), and a semi-statically reconstructed uplink reference signal is transmitted through the same.
  • the pseudo random sequence in the same subframe should actually change the pseudo random sequence initialization value without waiting until the start of the next radio frame.
  • An example of changing an initialization value (ie, initialization of a pseudo random sequence generator) and transmitting a dynamically switched reference signal therethrough is illustrated.
  • the pseudo random sequence initialization value upon receiving signaling information for quasi-static reconstruction of values of parameters in a parameter set, the pseudo random sequence initialization value is actually not waited until the start of the next radio frame. In the same subframe that needs to be changed, the pseudo random sequence initialization value is changed (ie, initialization of the pseudo random sequence generator), and a semi-statically reconstructed reference signal is transmitted through the pseudo random sequence initialization value.
  • the two embodiments are different depending on whether the dynamic switching of the two parameter sets or the quasi-static reconfiguration of the values of the parameters in the parameter set is different, but the uplink in a specific subframe by the dynamic switching or the quasi-static reconfiguration is different. If a change in the pseudo random sequence initialization value for the reference signal occurs, the pseudo random sequence initialization value is changed (i.e., pseudo random sequence initialization) at the very subframe in which the actual pseudo random sequence initialization value should be changed without waiting for the start of the next radio frame. In terms of initialization of the sequence generator, the applied method is the same.
  • FIG. 5 illustrates a pseudo random sequence generation method for transmitting a reference signal according to the first initialization method of the present invention.
  • the initialization cycle of the pseudo-random sequence generator for generating a reference signal is referred to as' a subframe in which the start value of every radio radio frame and the initialization value c init of every pseudo random sequence are changed.
  • the parameter set is to be a quasi-static or dynamic reconfiguration Singh switched, so that each time the initial value of the pseudo-random sequence c init changes the pseudo-random sequence may be applied to the value c init of the generator also changes.
  • a subframe that is, a subframe having a subframe index of “4”
  • the change in the value of c init which is an initialization value of the pseudo random sequence, may be represented by a change in c init itself, or may be represented by a change of specific parameters in the parameter set. For example, as mentioned earlier, if there are three independent parameters in the parameter set , , Change in case there are two independent parameters in the parameter set , Change in, or one independent parameter in the parameter set It can also be expressed as a change of.
  • Equations of the respective parameters for the first initialization scheme of the present invention may be the same as Equations 6, 7 and 8.
  • the pseudo random sequence c (i) is defined by the 31st order gold sequence, and the pseudo random sequence generator is used at the beginning of every radio frame and at the beginning of each subframe in which a change in c init occurs or is applied. Should be initialized to (The pseudo-random sequence c (i) is defined by an order-31 Gold sequence. The pseudo-random sequence generator shall be initialized with at the beginning of each radio frame and at the start of each subframe in which the change of c init is occurred (or applied).)
  • Equation 6 Is or Can be expressed and applied, May be configured as zero.
  • a pseudo random sequence c (i) is defined by a 31st order gold sequence, and a pseudo random sequence generator is used at the beginning of every radio frame and at the beginning of each subframe in which a change in c init occurs or applies.
  • the pseudo-random sequence c (i) is defined by an order-31 Gold sequence.
  • the pseudo-random sequence generator shall be initialized with at the beginning of each radio frame and at the start of each subframe in which the change of c init is occurred (or applied).)
  • Equation 7 Is or It can also be expressed and applied as.
  • the pseudo random sequence c (i) is defined by a 31st order gold sequence, and the pseudo random sequence generator is used at the beginning of every radio frame and at the beginning of each subframe in which a change in c init occurs or applies.
  • the pseudo-random sequence c (i) is defined by an order-31 Gold sequence.
  • the pseudo-random sequence generator shall be initialized with at the beginning of each radio frame and at the start of each subframe in which the change of c init is occurred (or applied).)
  • Equation 8 Is or It can also be expressed as applied.
  • FIG. 6 illustrates a pseudo random sequence generation method for transmitting a reference signal according to the second initialization method of the present invention.
  • the initialization cycle is maintained as the existing 'start of every radio radio frame', and instead, the first parameter set A and the second parameter set ( According to parameter set B), each pseudo random sequence initialization value c init is applied separately.
  • an independent pseudo-random sequence generator is configured for each parameter set.
  • c init configured independently of each other, an independent pseudo-random sequence generator is configured for each parameter set.
  • the parameter set (parameter set A) c init init is c, consists of a 0, and the second parameter set (parameter set B) can be configured for a c init, 1.
  • the pseudo-random sequence from the pseudo-random sequence generator for another parameter set with different pre-generated c init is dynamically converted.
  • c is right doctor each change init values of the random sequence generator c init value also can be applied to dynamic switching.
  • two pseudo-random sequence initialization values c init, 0 and c init, 1 are generated in advance by two parameter sets at the beginning of every radio frame.
  • a reference signal is generated and transmitted by selectively using one of two initialization values.
  • Equations 9, 10, and 11 The parameters according to the second initialization scheme of the present invention may be expressed as in Equations 9, 10, and 11.
  • Equations 9 to 11 when the BSI & CSH indication field is 0, it means a dynamic signaling field value indicating the first parameter set or parameter set A, and the BSI & CSH indication field is indicated by the BSI & CSH indication field. 1 indicates a dynamic signaling field value indicating the second parameter set or parameter set B.
  • FIG. The expression may be expressed in other names or forms having the same meaning.
  • the BSI & CSH indication field may be replaced with a concept equivalent to the indication information described above.
  • the pseudo random sequence c (i) is defined by the 31st order gold sequence, and the pseudo random sequence generator for the case where the BSI & CSH indication field is 0 is generated at the beginning of every radio frame.
  • the pseudo-random sequence is defined by an order-31 Gold sequence.
  • the BSI & CSH indication field is 0, If the BSI & CSH indication field is 1, It can be expressed as.
  • Equation 9 Is ( ⁇ Is , Is May be applied as ( ⁇ And ) May be configured as zero.
  • Is (At this time, Is , Is It can also be expressed as).
  • Equation 10 Is , Is It can also be expressed as applied.
  • Equation 10 Is (At this time, Is It can also be expressed as).
  • Equation 11 Is (At this time, Is It can also be expressed as).
  • FIG. 7 is a flowchart illustrating a method of transmitting and receiving a reference signal according to an embodiment of the present invention.
  • FIG. 7 illustrates both a UE side generating a DM-RS and transmitting it to a transmission / reception point (eNodeB, etc.) and a transmission / reception point side receiving a DM-RS and estimating a channel state of the corresponding UE therefrom. It is shown to include.
  • the reference signal transmission method carried out at the UE side, the step of receiving one or more information of two parameter sets for two types of reference signals from the transmission and reception point (S710), 2 Dynamically receiving indication information indicating a parameter set to be used for generating a reference signal among the two parameter sets (S720), and generating a pseudo random sequence by the parameter set indicated by the indication information using a pseudo random sequence generator; And generating a reference signal by using the generated pseudo random sequence (S740).
  • the changed information is changed in the same subframe in which the change of the initialization value of the pseudo random sequence should be generated by the indication information.
  • the reference signal is generated and transmitted based on an initialization value.
  • step S710 information about each parameter may be transmitted in both the first parameter set and the second parameter set, but parameters having the same value as in the existing communication scheme (eg, LTE Rel-10) are not signaled. It may not. That is, one of the two parameter sets may not be signaled.
  • LTE Rel-10 LTE Rel-10
  • the signaling of the parameter set information in step S710 may be performed by higher layer signaling such as RRC, but is not limited thereto.
  • the indication information is information on which parameter set among parameter sets A and B is used to generate a UL DM-RS sequence, and may be indicated by one-bit explicit or implicit indication. Can be.
  • the signaling of such indication information may be performed by PDCCH signaling, in which case the indication information may be included in or derived from the DCI of the PDCCH.
  • steps S730 and S740 in order to generate and transmit a reference signal based on the changed initialization value in the same subframe where the change of the initialization value of the pseudo random sequence should be generated according to the indication information, the present invention as described above.
  • the first initialization method or the second initialization method may be used.
  • the pseudo random sequence initialization value is changed (that is, initialization of the pseudo random sequence generator), and a dynamically switched DM-RS is transmitted therethrough.
  • two pseudo random sequence initialization values of two parameter sets are generated in advance at the beginning of every radio frame, and then dynamics of the reference signal DM-RS are determined based on the indication information.
  • one of two initialization values may be selectively used to generate and transmit a reference signal.
  • the pseudo random sequence generator is initialized to an initialization value by a parameter set indicated by the indication information, and the initialization of the pseudo random sequence generator is added to the start time of every radio frame as in the prior art.
  • the change of the initialization value may be made even at the start of the subframe in which the change of the initialization value should occur.
  • the pseudo random sequence generator is independently configured for each parameter set, and each pseudo random sequence generator is initialized with two initialization values by the two parameter sets at each start point of each radio frame.
  • a pseudo random sequence and a reference signal thereof may be generated using a corresponding pseudo random sequence generator.
  • the step of transmitting the reference signal (DM-RS) by the step S740 is described in more detail, using the pseudo-random sequence generated according to an embodiment of the present invention according to equations (6) to (11) After generating and mapping the generated DM-RS sequence to a resource element, a process of generating an SC-FDMA signal including an uplink DM-RS and transmitting it to a transmission / reception point.
  • the method for receiving a reference signal by a transmission / reception point may include transmitting information on at least one of two parameter sets for two types of reference signals to the UE (S710), and generating a reference signal among the two parameter sets. Dynamically transmitting the indication information indicating the parameter set to be used to the UE (S720), and transmitting the UE in the same subframe in which a change of the initialization value of the pseudo random sequence for the reference signal should occur according to the indication information; Receiving a reference signal (S760), and using the received reference signal to measure the channel state of the UE (S770).
  • Steps S710 to S730 are substantially the same as described above mainly for the UE, and thus description thereof will be omitted to avoid duplication.
  • step S770 of measuring a channel state using the reference signal DM-RS the SC-FDMA signal including the DM-RS according to an embodiment of the present invention is received and the resource element D is decoded. De-mapping is performed to extract the uplink DM-RS sequence. Meanwhile, the channel state is measured by generating a DM-RS sequence based on the parameter set information and the indication information transmitted to the UE in steps S710 and S720 and comparing the DM-RS sequence extracted from the received signal.
  • FIG. 8 is a functional block diagram of a reference signal transmission apparatus according to an embodiment of the present invention.
  • Such a reference signal transmission apparatus is generally implemented in the UE or in conjunction with the UE, but is not limited thereto.
  • the apparatus 800 for transmitting a reference signal includes a parameter set information receiver 810 for receiving one or more information of two parameter sets for two types of reference signals from a transmission and reception point, and two parameters.
  • An instruction information receiver 820 for dynamically receiving instruction information indicating a parameter set to be used for generating a reference signal among sets, and a pseudo random sequence generated by the parameter set indicated by the instruction information using a pseudo random sequence generator.
  • a pseudo random sequence generator 830 and a reference signal processor 840 for generating and transmitting a reference signal using the generated pseudo random sequence.
  • pseudo random sequence generator 830 and the reference signal processor 840 generate a reference signal based on the changed initialization value in the very subframe in which the change of the initialization value of the pseudo random sequence should occur according to the indication information. Send.
  • the pseudo random sequence generator 830 and the reference signal processor 840 are based on the changed initialization value in the very subframe in which the change of the initialization value of the pseudo random sequence should occur according to the indication information.
  • the very subframe start time point (subframe number in FIG. 5), in which the pseudo random sequence initialization value should be changed without waiting for the start of the next radio frame.
  • the first initialization scheme of changing the pseudo random sequence initialization value i.e., initializing the pseudo random sequence generator
  • transmitting a dynamically switched DM-RS through it, and by two parameter sets at the beginning of every radio frame.
  • Two pseudo random sequence initialization values are generated in advance, and then the reference signal (DM-RS)
  • a reference signal may be selectively generated using one of two initialization values to generate and transmit a reference signal.
  • the parameter set information received by the parameter set information receiver 810 from the transmission and reception point may be information on both the first parameter set and the second parameter set, but the existing communication scheme (for example, LTE Rel-10). Parameters having the same value as may not be signaled, and signaling of parameter set information may be performed by higher layer signaling such as RRC.
  • the indication information received by the indication information receiver 820 may be one bit of explicit indication information included in the DCI of the PDCCH or the like, or may be information implicitly derived from the DCI of the PDCCH.
  • the reference signal processor 840 generates a DM-RS sequence according to Equations 6 to 11 by using the pseudo random sequence generated by the pseudo random sequence generator 830 according to the first or second embodiment. After mapping the generated DM-RS sequence to a resource element, a function of generating an SC-FDMA signal including an uplink DM-RS and transmitting it to a transmission / reception point is performed.
  • FIG. 9 is a functional block diagram of a reference signal reception and channel measurement apparatus according to an embodiment of the present invention.
  • Such a reference signal receiver is generally implemented at a reception point of an uplink reference signal, such as a base station, an eNodeB, but is not limited thereto.
  • the apparatus 900 for receiving a reference signal generates one or more information of two parameter sets for dynamic switching of a reference signal (DM-RS) and transmits the parameter set information processor 910 to the UE.
  • the reference signal received by the reference signal receiving unit 930 is, as described above, at the beginning of the very subframe in which the initialization value of the pseudo random sequence should be changed according to the first initialization method and the second initialization method of the present invention.
  • the channel measuring unit 940 receives the SC-FDMA signal including the DM-RS transmitted by the UE in the subframe in which the change of the initialization value of the pseudo random sequence is to be generated according to the indication information, and demaps the resource element. De-mapping to extract the uplink DM-RS sequence, and the DM-RS based on the parameter set information and the indication information transmitted from the parameter set information processor 910 and the indication information processor 920 to the UE. The channel state is measured by generating a sequence and comparing it with the DM-RS sequence extracted from the received signal.
  • FIG. 10 is a flowchart illustrating a method of transmitting and receiving a reference signal according to another embodiment of the present invention.
  • steps S1020 and S1030 include the start of the next subframe from the time point at which one or more parameter values are received for quasi-static reconstruction. Rather than wait until a point in time, a change in the initialization value of the pseudo-random sequence is performed in the same subframe by which quasi-static reconstruction signaling should occur.
  • the very subframe in which the change of the initialization value of the pseudo random sequence should be generated by the quasi-static reconfiguration signaling may be the very subframe in which the parameter value for the quasi-static reconfiguration has been received, or the RRC reconfiguration at the UE side. It may be a subframe that transmits a reconfiguration complete message to the transmission / reception point eNB after completing. Alternatively, a subframe after a predetermined time from the two subframes (parameter reception subframe or reconfiguration complete message transmission subframe) may be the same subframe where an initial value change should occur.
  • Signaling or transmission of the parameter value for the quasi-static reconfiguration may be performed by higher layer signaling such as RRC, but is not limited thereto.
  • the one or more parameter values for the quasi-static reconstruction are the generation of the initialization value c init of the pseudo random sequence for the basic sequence and the cyclic delay hopping (CSH). May be a value for one parameter commonly used in the generation of an initialization value c init of the pseudo random sequence, or the generation of an initialization value c init of the pseudo random sequence for the base sequence and the cyclic delay hopping ( Initialization value of the pseudo-random sequence for CSH) may be the respective value for two or more parameters each used independently in the generation of c init .
  • CSH cyclic delay hopping
  • the pseudo random sequence generator is initialized to an initialization value by a signaled parameter value for quasi-static reconstruction, and the initialization of the pseudo random sequence generator is added to the beginning of every radio frame as in the prior art.
  • the change of the initialization value may be made even at the start of the subframe in which the change of the initialization value should occur.
  • a pseudo-random sequence generator is generated at a start point of a subframe after a predetermined time from a subframe transmitting a frame or reconfiguration complete message to a transmission / reception point, or a subframe receiving parameter information or a subframe transmitting a reconfiguration completion message. Initialize to the initialization value.
  • step S1030 The process of generating and transmitting the reference signal DM-RS in step S1030 is the same as described with reference to S740 of FIG.
  • the method of receiving a reference signal by the transmission and reception point, the step of transmitting a quasi-static reconstruction of the reference signal to the UE (S1010), and the change of the initialization value of the pseudo random sequence by the quasi-static reconstruction signaling occurs Receiving a reference signal transmitted by the UE in the same subframe to be performed (S1040), and measuring the channel state of the UE using the received reference signal (S1050).
  • Steps S1010 and S1040 are substantially the same as steps S1010 and S1030 described above mainly by the UE, and the process of measuring the channel state using the reference signal is substantially the same as step S770 of FIG. 7 described above, so as to avoid duplication. Detailed description will be omitted.
  • the pseudo random sequence generator is initialized to an initialization value according to the value of one or more parameters included in the signaling information for quasi-static reconstruction, and the initialization of the pseudo random sequence generator starts at the start of every radio frame.
  • the change of the initialization value is also performed at the start of the subframe in which the change is to occur.
  • FIG. 11 is a functional block diagram of a reference signal transmission apparatus according to another embodiment of the present invention.
  • the apparatus for transmitting a reference signal 1100 includes a parameter information receiver 1110 semi-statically receiving one or more parameter values in order to quasi-statically reconstruct a reference signal from a transmission / reception point, and a pseudo random sequence generator.
  • the pseudo random sequence generator 1120 and the reference signal processor 1130 may include a reference signal based on the changed initialization value in the very subframe in which a change in the initialization value of the pseudo random sequence should occur by quasi-static reconstruction signaling. Create and send
  • the pseudo random sequence generator 1120 and the reference signal processor 1130 may change the initialization value of the pseudo random sequence by quasi-static reconstruction signaling, that is, reception of a new parameter value.
  • quasi-static reconstruction signaling that is, reception of a new parameter value.
  • the pseudo random sequence initialization value should be actually changed without waiting for the start of the next radio frame.
  • a first method of changing a pseudo random sequence initialization value (ie, initialization of a pseudo random sequence generator) at the start of the subframe and transmitting the reference signal DM-RS using the same may be used.
  • parameters having the same value as in the existing communication scheme may not be signaled.
  • the signaling may be performed by higher layer signaling such as RRC.
  • the reference signal processor 1130 generates a DM-RS sequence according to Equations 6 to 11 by using the pseudo random sequence generated by the pseudo random sequence generator 1120 according to the first scheme, and generates the generated DM-RS sequence. After the -RS sequence is mapped to the resource element, a function of generating an SC-FDMA signal including an uplink DM-RS and transmitting it to a transmission / reception point is performed.
  • FIG. 12 is a functional block diagram of a reference signal reception and channel measurement apparatus according to another embodiment of the present invention.
  • the reference signal receiving apparatus 1200 generates a parameter information (parameter value) for semi-static reconstruction of the reference signal DM-RS and transmits the parameter information to the UE. 1210 and the UE generates and transmits the UE based on the changed initialization value in the same subframe in which a change of the initialization value of the pseudo random sequence for the reference signal should be generated by signaling the parameter information for quasi-static reconstruction.
  • a reference signal receiver 1220 for receiving a reference signal and a channel state measurement unit 1230 for measuring a channel state of the UE from the received reference signal.
  • the reference signal received by the reference signal receiver 1120 initializes the pseudo random sequence generator at the beginning of the very subframe in which the initialization value of the pseudo random sequence should be changed according to the first method of the present invention. It may be a reference signal generated and transmitted. Since the detailed configuration is the same as described with reference to FIG. 5, the detailed description is omitted to avoid duplication.
  • the channel measuring unit 1130 receives the SC-FDMA signal including the DM-RS transmitted by the UE in the subframe in which the change of the initialization value of the pseudo random sequence should be generated according to the indication information, and demaps the resource element. (De-mapping) to extract the uplink DM-RS sequence, the parameter information processing unit 1110 generates a DM-RS sequence based on the parameter information transmitted to the UE, and the DM extracted from the received signal Measure channel state by comparison with RS sequence
  • the DM-RS may also be used in the case of a sounding reference signal (SRS), which is another uplink reference signal that generates a sequence of the reference signal through a basic sequence and cyclic delay hopping (CSH).
  • SRS sounding reference signal
  • CSH basic sequence and cyclic delay hopping

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Abstract

La présente invention concerne un appareil et un procédé d'émission-réception d'un signal de référence (RS) dans un système de communication sans fil. Dans la commutation dynamique ou la reconfiguration semi-statique d'un signal de référence de démodulation (DM-RS) ou un signal de référence de sondage (SRS) qui est un signal de référence de liaison montante (UL) dépendant d'un environnement de communication de telle sorte que, CoMP MU-MIMO et analogue, un changement dans valeur d'initialisation de séquences pseudo-aléatoires destiné à être utilisé dans le DM-RS ou SRS et une transmission de DM-RS ou SRS résultant du changement peut être effectuée immédiatement dans une sous-trame concernée au lieu d'être réalisé dans chaque trame radio, ce qui permet ainsi une estimation du réseau en liaison montante rapide et plus précisement estimation de voie sur la liaison montante.
PCT/KR2013/001791 2012-03-26 2013-03-06 Procédé et appareil d'émission-réception de signal de référence dans un système de communication sans fil WO2013147430A1 (fr)

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KR20100046565A (ko) * 2008-10-27 2010-05-07 삼성전자주식회사 무선 통신 시스템에서 순환 전치 길이 변경 방법 및 이를 위한 시스템
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KR20110026399A (ko) * 2009-09-07 2011-03-15 엘지전자 주식회사 무선 통신 시스템에서 참조신호를 송수신하기 위한 방법 및 장치
US20110237267A1 (en) * 2009-09-30 2011-09-29 Qualcomm Incorporated Ue-rs sequence initialization for wireless communication systems

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CN105981461A (zh) * 2014-02-26 2016-09-28 夏普株式会社 终端装置、集成电路以及无线通信方法
WO2019070183A1 (fr) * 2017-10-02 2019-04-11 Telefonaktiebolaget Lm Ericsson (Publ) Brouillage unifié de signaux de référence
US11444741B2 (en) 2017-10-02 2022-09-13 Telefonaktiebolaget Lm Ericsson (Publ) Unified scrambling of reference signals
WO2020091577A1 (fr) * 2018-11-02 2020-05-07 엘지전자 주식회사 Procédé de transmission d'un signal de référence dans un système de communication sans fil, et appareil pour celui-ci
US11924128B2 (en) 2018-11-02 2024-03-05 Lg Electronics Inc. Method for transmitting reference signal in wireless communication system, and apparatus therefor
CN113645035A (zh) * 2021-07-21 2021-11-12 中国电子科技集团公司电子科学研究院 物理层安全传输方法、系统、设备及计算机可读存储介质

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