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WO2017034105A1 - Procédé de transmission de signal dmrs et dispositif associé - Google Patents

Procédé de transmission de signal dmrs et dispositif associé Download PDF

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Publication number
WO2017034105A1
WO2017034105A1 PCT/KR2016/000815 KR2016000815W WO2017034105A1 WO 2017034105 A1 WO2017034105 A1 WO 2017034105A1 KR 2016000815 W KR2016000815 W KR 2016000815W WO 2017034105 A1 WO2017034105 A1 WO 2017034105A1
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WO
WIPO (PCT)
Prior art keywords
subcarrier
dmrs
terminal
base station
filter coefficient
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2016/000815
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English (en)
Korean (ko)
Inventor
이상림
고현수
노광석
김동규
이호재
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of WO2017034105A1 publication Critical patent/WO2017034105A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting DMRS.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the new waveform technology which is being considered as the core technology of the next generation 5G system, significantly reduces out-of-band emission (OOBE) compared to OFDM, and effectively utilizes fragmented spectrum in time depleted and time asynchronous performance. You can expect a benefit.
  • OOBE out-of-band emission
  • the technical problem to be achieved in the present invention is to provide a method for a terminal to transmit a DeModulation Referenece Signal (DMRS).
  • DMRS DeModulation Referenece Signal
  • Another object of the present invention is to provide a terminal for transmitting a DMRS (DeModulation Referenece Signal).
  • DMRS Demodulation Referenece Signal
  • a method for transmitting a DMRS (DeModulation Referenece Signal) by the terminal for each DMRS sequence generated for each subcarrier of the first resource block (RB) allocated to the terminal Presenting an inverse of a phase of a corresponding filter coefficient and a magnitude of the corresponding filter coefficient for each subcarrier; And transmitting the DMRS to which the presentation is applied to a base station.
  • DMRS Demodulation Referenece Signal
  • the method may further include performing the presentation in RB units for each of the RBs allocated by the terminal in addition to the first RB; And transmitting, to the base station, a DMRS to which an award is applied for each of the RBs allocated by the terminal, in addition to the first RB.
  • the phase for each filter coefficient is different for each subcarrier.
  • the inverse of the magnitude of the corresponding filter coefficient for each subcarrier is 1 /
  • the filter is characterized in that the filtering is applied to a plurality of subcarriers.
  • a terminal transmitting a DMRS includes a subcarrier for each DMRS sequence generated for each subcarrier of a first resource block (RB) allocated to the terminal.
  • a processor configured to present a reciprocal of a phase of each filter coefficient and a magnitude of the magnitude of the corresponding filter coefficient for each;
  • a transmitter configured to transmit the DMRS to which the announcement is applied to a base station.
  • the processor is configured to present the prizes in RB units for each of the RBs allocated by the terminal in addition to the first RB, and the transmitter is configured to apply the prize for each of the RBs allocated by the terminal in addition to the first RB. And may transmit a DMRS to the base station.
  • the processor may be configured to phase out corresponding filter coefficients for each subcarrier. And the inverse of the magnitude of the corresponding filter coefficient for each subcarrier is 1 /
  • the filter is characterized in that the filtering is applied to a plurality of subcarriers.
  • all channels of RB-wise filtered OFDM or Filtered Multicarrier system as well as FCP-OFDM can maintain and receive DMRS sequence characteristics, thereby enabling accurate channel estimation.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • FIG. 2 is a diagram illustrating a transmitting and receiving end of an apparatus using an FCP-OFDM scheme that applies a filter in units of a subcarrier bundle.
  • FIG. 3 is a diagram illustrating an example of a power spectrum comparison between FCP-OFDM and OFDM.
  • FIG. 5 is a diagram illustrating a frequency response of an actual chebyshev filter applied to one RB.
  • a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like.
  • the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
  • UE user equipment
  • MS mobile station
  • AMS advanced mobile station
  • AP Access Point
  • a terminal or a user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
  • the information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.
  • 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 with 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 in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) employs OFDMA in downlink and SC-FDMA in uplink as part of Evolved UMTS (E-UMTS) using E-UTRA.
  • LTE-A Advanced is an evolution of 3GPP LTE.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • the wireless communication system 100 may include one or more base stations and / or one or more terminals. .
  • the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver ( 190, a symbol demodulator 195, and a receive data processor 197.
  • the terminal 110 transmits (Tx) the data processor 165, the symbol modulator 170, the transmitter 175, the transmit / receive antenna 135, the processor 155, the memory 160, the receiver 140, and the symbol. It may include a demodulator 155 and a receive data processor 150.
  • the base station 105 and the terminal 110 are provided with a plurality of transmit and receive antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support a multiple input multiple output (MIMO) system. In addition, the base station 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.
  • MIMO multiple input multiple output
  • SU-MIMO single user-MIMO
  • MU-MIMO multi-user-MIMO
  • the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
  • the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
  • the symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter 125.
  • each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero.
  • pilot symbols may be sent continuously.
  • the pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.
  • Transmitter 125 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency upconverts) the analog signals to provide a wireless channel. Generates a downlink signal suitable for transmission via the transmission antenna 130, the transmission antenna 130 transmits the generated downlink signal to the terminal.
  • the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140.
  • Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
  • the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
  • the symbol demodulator 145 also receives a frequency response estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
  • the processing by symbol demodulator 145 and receiving data processor 150 is complementary to the processing by symbol modulator 120 and transmitting data processor 115 at base station 105, respectively.
  • the terminal 110 is on the uplink, and the transmit data processor 165 processes the traffic data to provide data symbols.
  • the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
  • the transmitter 175 receives and processes a stream of symbols to generate an uplink signal.
  • the transmit antenna 135 transmits the generated uplink signal to the base station 105.
  • an uplink signal is received from the terminal 110 through the reception antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
  • the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
  • the received data processor 197 processes the data symbol estimates to recover the traffic data transmitted from the terminal 110.
  • Processors 155 and 180 of the terminal 110 and the base station 105 respectively instruct (eg, control, coordinate, manage, etc.) operations at the terminal 110 and the base station 105, respectively.
  • Respective processors 155 and 180 may be connected to memory units 160 and 185 that store program codes and data.
  • the memory 160, 185 is coupled to the processor 180 to store the operating system, applications, and general files.
  • the processors 155 and 180 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like.
  • the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
  • the firmware or software configured to be may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processors 155 and 180.
  • the layers of the air interface protocol between the terminal and the base station between the wireless communication system (network) are based on the lower three layers of the open system interconnection (OSI) model, which is well known in the communication system. ), And the third layer L3.
  • the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
  • a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
  • the terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.
  • the processor 155 of the terminal and the processor 180 of the base station process the signals and data, except for the function of receiving or transmitting the signal and the storage function of the terminal 110 and the base station 105, respectively.
  • the following description does not specifically refer to the processors 155 and 180.
  • the processors 155 and 180 it may be said that a series of operations such as a function of receiving or transmitting a signal and a data processing other than a storage function are performed.
  • the present invention relates to a new waveform, called Filtered CP-OFDM (FCP-OFDM), which is a new waveform for future communication.
  • FCP-OFDM Filtered CP-OFDM
  • the present invention proposes a sequence when a filter is applied in RB units.
  • FIG. 2 is a diagram illustrating a transmitting and receiving end of an apparatus using an FCP-OFDM scheme that applies a filter in units of a subcarrier bundle.
  • the transmitter applies a filter in units of a bundle of several subcarriers.
  • filters in subband units as described above, the influence of signals on other adjacent bands can be greatly reduced as compared to the conventional OFDM scheme.
  • the application of subband filters has great gains in terms of the utilization of the fragmented spectrum in a situation where the frequency resources are currently depleted, and also serves as a foundation for future technology communication.
  • FIG. 3 is a diagram illustrating an example of a power spectrum comparison between FCP-OFDM and OFDM.
  • the power of the signal affecting the other bands of the existing OFDM gradually drops, whereas in the case of UF-OFDM, it drops quickly. Based on this characteristic, it is regarded as one candidate of the new waveform.
  • a filter as shown in FIG. 4 As a filter for reducing out-of-emission radiation in FCP-OFDM, a filter as shown in FIG. 4 is generally applied. Application of the filter shown in FIG. 4 reduces out-of-band emissions of the FCP-OFDM shown in FIG.
  • This new waveform enables a variety of services using the fragmented spectrum. For example, it can provide machine type communication and low latency services. In addition, it can be regarded as one waveform that satisfies heterogeneous service requirements in the future.
  • the present invention proposes a new reference signal design for a new waveform to which a filter is applied in RB units. More specifically, the position pattern of the new reference signal according to the characteristics of the filter is proposed.
  • the signal-to-noise ratio of each subcarrier differs according to the frequency response of the filter.
  • FIG. 5 is a diagram illustrating a frequency response of an actual chebyshev filter applied to one RB.
  • the frequency response of the portion is not flat. That is, the magnitude and phase of the corresponding frequency response are different from the conventional one. Therefore, in the case of the existing uplink demodual reference reference singling (DMRS), the characteristics of the existing Zad-off sequence are changed by the influence of the filter, and the pre-selection is performed in advance according to the applied filter in order to maintain this property. Compensation is possible to operate the same in the existing receiver.
  • DMRS uplink demodual reference reference singling
  • Table 1 below shows a method of generating an uplink DMRS sequence in an LTE / LTE-A system.
  • the uplink DMRS sequence shown in Table 1 is generated for each subcarrier.
  • n represents a subcarrier index.
  • a method of creating an uplink DMRS sequence in an existing LTE / LTE-A system will be described.
  • the existing LTE system in order to estimate a channel between layers in a multi-antenna situation, it is designed to maintain orthogonality with each other.
  • the orthogonality at the receiver or the receiver is broken, resulting in degradation of channel estimation.
  • f1 to f12 have complex values. Therefore, in order to maintain the orthogonality of the DMRS sequence at the receiving end or the receiving side, the transmission end or the transmitting side may preliminarily present the subcarrier unit to multiply the inverse of the filter coefficient magnitude by the inverse of the phase to maintain the orthogonality of the sequence. This will affect performance.
  • Embodiment 1 Phase Presentation Technique for Uplink DMRS Reception
  • the sequence is S1, S2,... In each subcarrier of one RB among the N resource blocks (RBs) allocated by the terminal. Assume that S12 is applied. And, the phase for each coefficient of the filter F Suppose that the DMRS sequence generated for each subcarrier Multiply by to compensate for the phase of the original data through the filter at the transmitting end of the terminal, the receiving end of the base station can receive the DMRS while maintaining the characteristics of the original sequence.
  • the receiving end of the base station receives a value multiplied by the size of the filter coefficient for each RB unit. Therefore, after receiving the DMRS, the base station receives 1 /
  • Embodiment 2 A Size and Phase Representation Technique for Uplink DMRS Reception
  • the receiving end of the base station can estimate a better channel using the characteristics of the existing DMRS sequence without further processing.
  • the peak-to-average power ratio PAPR
  • the PAPR peak-to-average power ratio
  • the technique of presenting both the phase and the magnitude at the transmitting end of the terminal flattens the frequency response in the in-band region, thereby improving the PAPR.
  • the subcarrier located at the edge of the RB Increasing power results in worsening OOB. Therefore, which of the first and second embodiments is to be used, it is necessary to adaptively use both techniques according to the power situation of the terminal.
  • the UE located at the cell edge is in a power-limited environment and the issue of PAPR becomes an important issue. Accordingly, the terminal located at the cell edge can mitigate the PAPR problem through the technique of presenting both magnitude and phase as in the first embodiment.
  • the effect of reducing OOB can be maximized by only showing the phase as in the second embodiment.
  • the base station may instruct the terminal whether to use any of the first and second techniques as a physical layer signal or a higher layer signal.
  • the terminal may indicate to the base station which technique to use for the base station as a physical layer signal (for example, PUCCH, PUSCH). In this case, it may be indicated by a size of 1 bit indicating whether to use which technique.
  • the method proposed in the present invention can be applied not only to FCP-OFDM but also to all RB-wise filtered OFDM schemes or to a filtered multicarrier system.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • the method of transmitting a DMRS by the terminal can be used in various industries in various wireless communication systems such as 3GPP LTE / LTE-A system.

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

Abstract

La présente invention concerne un procédé permettant à un terminal de transmettre un signal de référence de démodulation (DMRS), qui peut comprendre les étapes consistant à : pour une séquence DMRS générée par chaque sous-porteuse d'un premier bloc de ressources (RB) attribué au terminal, pré-compenser, par chacune des sous-porteuses, une phase par coefficient de filtre correspondant et la réciproque de la taille du coefficient de filtre correspondant ; et transmettre, à une station de base, le DMRS auquel la pré-compensation a été appliquée.
PCT/KR2016/000815 2015-08-24 2016-01-26 Procédé de transmission de signal dmrs et dispositif associé Ceased WO2017034105A1 (fr)

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US201562208818P 2015-08-24 2015-08-24
US62/208,818 2015-08-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020091570A1 (fr) * 2018-11-02 2020-05-07 엘지전자 주식회사 Procédé selon lequel un terminal reçoit une ressource de liaison montante préconfigurée en provenance d'une station de base dans un système de communication sans fil et dispositif associé
CN115987725A (zh) * 2023-03-17 2023-04-18 深圳国人无线通信有限公司 一种基于多用户dmrs信道时偏处理方法及装置

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US20130022090A1 (en) * 2011-07-21 2013-01-24 Jianfeng Weng Dynamic Cyclic Prefix Mode for Uplink Radio Resource Management
US20130336282A1 (en) * 2011-03-01 2013-12-19 Sharp Kabushiki Kaisha Transmitter apparatus, receiver apparatus, communication system, communication method, and integrated circuit
US20140064391A1 (en) * 2010-10-11 2014-03-06 Peng Cheng Uplink noise estimation for virtual mimo
US20150043465A1 (en) * 2012-03-09 2015-02-12 Sharp Kabushiki Kaisha Base station, terminal, communication method, and integrated circuit
US20150049704A1 (en) * 2012-05-18 2015-02-19 Lg Electronics Inc. Method and apparatus for transmitting or receiving downlink signal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140064391A1 (en) * 2010-10-11 2014-03-06 Peng Cheng Uplink noise estimation for virtual mimo
US20130336282A1 (en) * 2011-03-01 2013-12-19 Sharp Kabushiki Kaisha Transmitter apparatus, receiver apparatus, communication system, communication method, and integrated circuit
US20130022090A1 (en) * 2011-07-21 2013-01-24 Jianfeng Weng Dynamic Cyclic Prefix Mode for Uplink Radio Resource Management
US20150043465A1 (en) * 2012-03-09 2015-02-12 Sharp Kabushiki Kaisha Base station, terminal, communication method, and integrated circuit
US20150049704A1 (en) * 2012-05-18 2015-02-19 Lg Electronics Inc. Method and apparatus for transmitting or receiving downlink signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020091570A1 (fr) * 2018-11-02 2020-05-07 엘지전자 주식회사 Procédé selon lequel un terminal reçoit une ressource de liaison montante préconfigurée en provenance d'une station de base dans un système de communication sans fil et dispositif associé
US12021772B2 (en) 2018-11-02 2024-06-25 Lg Electronics Inc. Method whereby terminal receives preconfigured uplink resource from base station in wireless communication system, and device for same
CN115987725A (zh) * 2023-03-17 2023-04-18 深圳国人无线通信有限公司 一种基于多用户dmrs信道时偏处理方法及装置
CN115987725B (zh) * 2023-03-17 2023-05-23 深圳国人无线通信有限公司 一种基于多用户dmrs信道时偏处理方法及装置

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