WO2017043801A1 - Procédé de réception d'un signal de liaison descendante et équipement d'utilisateur, et procédé d'émission d'un signal de liaison descendante et station de base - Google Patents

Procédé de réception d'un signal de liaison descendante et équipement d'utilisateur, et procédé d'émission d'un signal de liaison descendante et station de base Download PDF

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Publication number
WO2017043801A1
WO2017043801A1 PCT/KR2016/009692 KR2016009692W WO2017043801A1 WO 2017043801 A1 WO2017043801 A1 WO 2017043801A1 KR 2016009692 W KR2016009692 W KR 2016009692W WO 2017043801 A1 WO2017043801 A1 WO 2017043801A1
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reference signal
iot
subframe
cell
transmitted
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PCT/KR2016/009692
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English (en)
Korean (ko)
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유향선
이윤정
김봉회
김기준
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엘지전자 주식회사
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Publication of WO2017043801A1 publication Critical patent/WO2017043801A1/fr

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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 a wireless communication system, and more particularly, to a method and apparatus for downlink signal transmission or reception.
  • M2M smartphone-to-machine communication
  • smart phones and tablet PCs which require high data transmission rates
  • M2M smartphone-to-machine communication
  • the amount of data required to be processed in a cellular network is growing very quickly.
  • carrier aggregation technology, cognitive radio technology, etc. to efficiently use more frequency bands, and increase the data capacity transmitted within a limited frequency Multi-antenna technology, multi-base station cooperation technology, and the like are developing.
  • a typical wireless communication system performs data transmission / reception over one downlink (DL) band and one uplink (UL) band corresponding thereto (frequency division duplex (FDD) mode). Or a predetermined radio frame divided into an uplink time unit and a downlink time unit in a time domain, and perform data transmission / reception through uplink / downlink time units (time division duplex). (for time division duplex, TDD) mode).
  • a base station (BS) and a user equipment (UE) transmit and receive data and / or control information scheduled in a predetermined time unit, for example, a subframe (SF). Data is transmitted and received through the data area set in the uplink / downlink subframe, and control information is transmitted and received through the control area set in the uplink / downlink subframe.
  • the carrier aggregation technique can collect a plurality of uplink / downlink frequency blocks to use a wider frequency band and use a larger uplink / downlink bandwidth, so that a greater amount of signals can be processed simultaneously than when a single carrier is used. .
  • a node is a fixed point capable of transmitting / receiving a radio signal with a UE having one or more antennas.
  • a communication system having a high density of nodes can provide higher performance communication services to the UE by cooperation between nodes.
  • NB-IoT narrowband internet of things
  • Downlink data and the NB-IoT reference signal may be transmitted on one resource block in a subframe.
  • the reference signal may be transmitted in a reference signal pattern defined so that the interval of the reference signal is the same in the remaining subcarriers other than the subcarriers used for the DC tone among the subcarriers in the one resource block in the subframe.
  • NB-IoT narrowband internet of things
  • the NB-IoT uses a limited channel bandwidth for the one resource block including 12 subcarriers in the frequency domain,
  • the reference signal is received in the reference signal pattern of the following table on the one resource block in the subframe:
  • a row is the remaining subcarriers k' ⁇ ⁇ 0, except for the DC subcarriers used as DC tones among the twelve subcarriers k ⁇ ⁇ 0,1, ..., 11 ⁇ of the one resource block. 1, ..., 10 ⁇ , and a column represents orthogonal frequency division multiplexing (OFDM) symbols in the subframe, and R represents the reference signal.
  • OFDM orthogonal frequency division multiplexing
  • NB-IoT narrowband internet of things
  • the NB-IoT uses a limited channel bandwidth for the one resource block including 12 subcarriers in the frequency domain,
  • the reference signal is transmitted in the reference signal pattern of the following table on the one resource block in the subframe:
  • a row is the remaining subcarriers k' ⁇ ⁇ 0, except for the DC subcarriers used as DC tones among the twelve subcarriers k ⁇ ⁇ 0,1, ..., 11 ⁇ of the one resource block. 1, ..., 10 ⁇ , and a column represents orthogonal frequency division multiplexing (OFDM) symbols in the subframe, and R represents the reference signal.
  • OFDM orthogonal frequency division multiplexing
  • NB-IoT narrowband internet of things
  • a radio frequency (RF) unit and
  • a processor configured to control the RF unit, the processor comprising:
  • the NB-IoT uses a limited channel bandwidth for the one resource block including 12 subcarriers in the frequency domain,
  • the reference signal is received in the reference signal pattern of the following table on the one resource block in the subframe:
  • a row is the remaining subcarriers k' ⁇ ⁇ 0, except for the DC subcarriers used as DC tones among the twelve subcarriers k ⁇ ⁇ 0,1, ..., 11 ⁇ of the one resource block. 1, ..., 10 ⁇ , and a column represents orthogonal frequency division multiplexing (OFDM) symbols in the subframe, and R represents the reference signal.
  • OFDM orthogonal frequency division multiplexing
  • NB-IoT narrowband internet of things
  • a radio frequency (RF) unit and
  • a processor configured to control the RF unit, the processor comprising:
  • the NB-IoT uses a limited channel bandwidth for the one resource block including 12 subcarriers in the frequency domain,
  • the reference signal is transmitted in the reference signal pattern of the following table on the one resource block in the subframe:
  • a row is the remaining subcarriers k' ⁇ ⁇ 0, except for the DC subcarriers used as DC tones among the twelve subcarriers k ⁇ ⁇ 0,1, ..., 11 ⁇ of the one resource block. 1, ..., 10 ⁇ , and a column represents orthogonal frequency division multiplexing (OFDM) symbols in the subframe, and R represents the reference signal.
  • OFDM orthogonal frequency division multiplexing
  • the reference signal pattern of Table 1 is a reference having a frequency shift value corresponding to an identifier of a cell in which one resource block is located among a plurality of reference signal patterns having different frequency shift values from each other.
  • the reference signal includes a reference signal R1 of a first antenna port for the NB-IoT and a reference signal R2 of a second antenna port for the NB-IoT, wherein the reference signal R1 and The reference signal R2 is received in the pattern of the following table:
  • the reference signal includes a reference signal R1 of a first antenna port for the NB-IoT and a reference signal R2 of a second antenna port for the NB-IoT, wherein the reference signal R1 and The reference signal R2 is received in the pattern of the following table:
  • the wireless communication signal can be efficiently transmitted / received. Accordingly, the overall throughput of the wireless communication system can be high.
  • a low / low cost user equipment can communicate with a base station while maintaining compatibility with an existing system.
  • a user device may be implemented at low / low cost.
  • coverage may be enhanced.
  • the user equipment and the base station can communicate in a narrow band.
  • FIG. 1 illustrates an example of a radio frame structure used in a wireless communication system.
  • FIG. 2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system.
  • FIG 3 illustrates a radio frame structure for transmission of a synchronization signal (SS).
  • SS synchronization signal
  • DL subframe structure used in a wireless communication system.
  • FIG. 5 shows an example of an uplink (UL) subframe structure used in a wireless communication system.
  • FIG. 6 illustrates a cell specific reference signal (CRS) and a user specific reference signal (UE-RS).
  • CRS cell specific reference signal
  • UE-RS user specific reference signal
  • FIG. 7 shows an example of a signal band for an MTC.
  • FIG. 13 and 14 illustrate RS structures according to another embodiment of the present invention.
  • 15 to 17 illustrate RS structures according to another embodiment of the present invention.
  • FIG. 18 is a diagram for describing a concept of space frequency block coding (SFBC).
  • SFBC space frequency block coding
  • FIG. 19 illustrates methods of applying precoding to a new reference signal according to the present invention.
  • FIG. 20 illustrates a cell-specific RS pattern of NB-IoT for two antenna ports.
  • 22 to 24 illustrate the signal transmission / reception example on the IoT cell according to another embodiment of the present invention.
  • 25 is a block diagram showing the components of the transmitter 10 and the receiver 20 for carrying out the present invention.
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA).
  • 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
  • MCD division multiple access
  • MCDMA multi-carrier frequency division multiple access
  • CDMA may be implemented in a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented in radio technologies such as Global System for Mobile Communication (GSM), General Packet Radio Service (GPRS), Enhanced Data Rates for GSM Evolution (EDGE) (i.e., GERAN), and the like.
  • GSM Global System for Mobile Communication
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE802-20, evolved-UTRA (E-UTRA), and the like.
  • IEEE Institute of Electrical and Electronics Engineers
  • WiFi WiFi
  • WiMAX WiMAX
  • IEEE802-20 evolved-UTRA
  • UTRA is part of Universal Mobile Telecommunication System (UMTS)
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • 3GPP LTE adopts OFDMA in downlink (DL) and SC-FDMA in uplink (UL).
  • LTE-advanced (LTE-A) is an evolution of 3GPP LTE. For convenience of explanation, hereinafter, it will be described on the assumption that the present invention is applied to 3GPP LTE / LTE-A.
  • an eNB allocates a downlink / uplink time / frequency resource to a UE, and the UE receives a downlink signal according to the allocation of the eNB and transmits an uplink signal.
  • it can be applied to contention-based communication such as WiFi.
  • an access point (AP) or a control node controlling the access point allocates resources for communication between a UE and the AP, whereas a competition-based communication technique connects to an AP. Communication resources are occupied through contention among multiple UEs that are willing to.
  • CSMA carrier sense multiple access
  • MAC probabilistic media access control
  • the transmitting device determines if another transmission is in progress before attempting to send traffic to the receiving device. In other words, the transmitting device attempts to detect the presence of a carrier from another transmitting device before attempting to transmit. When the carrier is detected, the transmission device waits for transmission to be completed by another transmission device in progress before initiating its transmission.
  • CSMA is a communication technique based on the principle of "sense before transmit” or “listen before talk”.
  • Carrier Sense Multiple Access with Collision Detection (CSMA / CD) and / or Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA) are used as a technique for avoiding collision between transmission devices in a contention-based communication system using CSMA.
  • CSMA / CD is a collision detection technique in a wired LAN environment. First, a PC or a server that wants to communicate in an Ethernet environment checks if a communication occurs on the network, and then another device If you are sending on the network, wait and send data.
  • CSMA / CD monitors the collisions to allow flexible data transmission.
  • a transmission device using CSMA / CD detects data transmission by another transmission device and adjusts its data transmission using a specific rule.
  • CSMA / CA is a media access control protocol specified in the IEEE 802.11 standard.
  • WLAN systems according to the IEEE 802.11 standard use a CA, that is, a collision avoidance method, without using the CSMA / CD used in the IEEE 802.3 standard.
  • the transmitting devices always detect the carrier of the network, and when the network is empty, wait for a certain amount of time according to their location on the list and send the data.
  • Various methods are used to prioritize and reconfigure transmission devices within a list.
  • a collision may occur, in which a collision detection procedure is performed.
  • Transmission devices using CSMA / CA use specific rules to avoid collisions between data transmissions by other transmission devices and their data transmissions.
  • the UE may be fixed or mobile, and various devices which communicate with a base station (BS) to transmit and receive user data and / or various control information belong to the same.
  • BS Base station
  • UE Terminal Equipment
  • MS Mobile Station
  • MT Mobile Terminal
  • UT User Terminal
  • SS Subscribe Station
  • wireless device PDA (Personal Digital Assistant), wireless modem
  • a BS generally refers to a fixed station communicating with the UE and / or another BS, and communicates with the UE and another BS to exchange various data and control information.
  • the BS may be referred to in other terms such as ABS (Advanced Base Station), Node-B (NB), evolved-NodeB (NB), Base Transceiver System (BTS), Access Point, and Processing Server (PS).
  • ABS Advanced Base Station
  • NB Node-B
  • NB evolved-NodeB
  • BTS Base Transceiver System
  • PS Access Point
  • eNB Processing Server
  • a node refers to a fixed point capable of transmitting / receiving a radio signal by communicating with a UE.
  • Various forms of eNBs may be used as nodes regardless of their name.
  • a node may be a BS, an NB, an eNB, a pico-cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, or the like.
  • the node may not be an eNB.
  • it may be a radio remote head (RRH), a radio remote unit (RRU).
  • RRH, RRU, etc. generally have a power level lower than the power level of the eNB.
  • the RRH or RRU or less, RRH / RRU is generally connected to the eNB by a dedicated line such as an optical cable
  • the RRH / RRU and the eNB are generally compared to cooperative communication by eNBs connected by a wireless line.
  • cooperative communication can be performed smoothly.
  • At least one antenna is installed at one node.
  • the antenna may mean a physical antenna or may mean an antenna port, a virtual antenna, or an antenna group. Nodes are also called points.
  • a cell refers to a certain geographic area in which one or more nodes provide communication services. Therefore, in the present invention, communication with a specific cell may mean communication with an eNB or a node that provides a communication service to the specific cell.
  • the downlink / uplink signal of a specific cell means a downlink / uplink signal from / to an eNB or a node that provides a communication service to the specific cell.
  • the cell providing uplink / downlink communication service to the UE is particularly called a serving cell.
  • the channel state / quality of a specific cell means a channel state / quality of a channel or communication link formed between an eNB or a node providing a communication service to the specific cell and a UE.
  • the UE transmits a downlink channel state from a specific node to a CRS in which antenna port (s) of the specific node are transmitted on a Cell-specific Reference Signal (CRS) resource allocated to the specific node. It may be measured using the CSI-RS (s) transmitted on the (s) and / or Channel State Information Reference Signal (CSI-RS) resources.
  • CRS Cell-specific Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • the 3GPP LTE / LTE-A system uses the concept of a cell to manage radio resources.
  • Cells associated with radio resources are distinguished from cells in a geographic area.
  • a "cell” in a geographic area may be understood as coverage in which a node can provide services using a carrier, and a "cell” of radio resources is a bandwidth (frequency) that is a frequency range configured by the carrier. bandwidth, BW).
  • Downlink coverage which is a range in which a node can transmit valid signals
  • uplink coverage which is a range in which a valid signal can be received from a UE, depends on a carrier carrying the signal, so that the coverage of the node is determined by the radio resources used by the node. It is also associated with the coverage of the "cell”.
  • the term "cell” can sometimes be used to mean coverage of a service by a node, sometimes a radio resource, and sometimes a range within which a signal using the radio resource can reach a valid strength.
  • the "cell” of radio resources is described in more detail later.
  • the 3GPP LTE / LTE-A standard corresponds to downlink physical channels corresponding to resource elements carrying information originating from an upper layer and resource elements used by the physical layer but not carrying information originating from an upper layer.
  • Downlink physical signals are defined.
  • a physical downlink shared channel (PDSCH), a physical broadcast channel (PBCH), a physical multicast channel (PMCH), a physical control format indicator channel (physical control) format indicator channel (PCFICH), physical downlink control channel (PDCCH) and physical hybrid ARQ indicator channel (PHICH) are defined as downlink physical channels
  • reference signal and synchronization signal Is defined as downlink physical signals.
  • a reference signal also referred to as a pilot, refers to a signal of a predetermined special waveform known to the eNB and the UE.
  • a cell specific RS, UE- UE-specific RS, positioning RS (PRS), and channel state information RS (CSI-RS) are defined as downlink reference signals.
  • the 3GPP LTE / LTE-A standard corresponds to uplink physical channels corresponding to resource elements carrying information originating from a higher layer and resource elements used by the physical layer but not carrying information originating from an upper layer.
  • Uplink physical signals are defined. For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are the uplink physical channels.
  • a demodulation reference signal (DMRS) for uplink control / data signals and a sounding reference signal (SRS) used for uplink channel measurement are defined.
  • Physical Downlink Control CHannel / Physical Control Format Indicator CHannel (PCFICH) / PHICH (Physical Hybrid automatic retransmit request Indicator CHannel) / PDSCH (Physical Downlink Shared CHannel) are respectively DCI (Downlink Control Information) / CFI ( Means a set of time-frequency resources or a set of resource elements that carry downlink format ACK / ACK / NACK (ACKnowlegement / Negative ACK) / downlink data, and also a Physical Uplink Control CHannel (PUCCH) / Physical (PUSCH) Uplink Shared CHannel / PACH (Physical Random Access CHannel) means a set of time-frequency resources or a set of resource elements that carry uplink control information (UCI) / uplink data / random access signals, respectively.
  • DCI Downlink Control Information
  • CFI Means a set of time-frequency resources or a set of resource elements that carry downlink format ACK / ACK
  • the PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH resource is referred to below ..
  • the user equipment transmits the PUCCH / PUSCH / PRACH, respectively.
  • PDCCH / PCFICH / PHICH / PDSCH is used for downlink data / control information on or through PDCCH / PCFICH / PHICH / PDSCH, respectively. It is used in the same sense as sending it.
  • CRS / DMRS / CSI-RS / SRS / UE-RS is assigned or configured OFDM symbol / subcarrier / RE to CRS / DMRS / CSI-RS / SRS / UE-RS symbol / carrier / subcarrier / RE It is called.
  • an OFDM symbol assigned or configured with a tracking RS (TRS) is called a TRS symbol
  • a subcarrier assigned or configured with a TRS is called a TRS subcarrier
  • an RE assigned or configured with a TRS is called a TRS RE.
  • a subframe configured for TRS transmission is called a TRS subframe.
  • a subframe in which a broadcast signal is transmitted is called a broadcast subframe or a PBCH subframe
  • a subframe in which a sync signal (for example, PSS and / or SSS) is transmitted is a sync signal subframe or a PSS / SSS subframe. It is called.
  • OFDM symbols / subcarriers / RE to which PSS / SSS is assigned or configured are referred to as PSS / SSS symbols / subcarriers / RE, respectively.
  • the CRS port, the UE-RS port, the CSI-RS port, and the TRS port are an antenna port configured to transmit CRS, an antenna port configured to transmit UE-RS, and an antenna configured to transmit CSI-RS, respectively.
  • Port an antenna port configured to transmit TRS.
  • Antenna ports configured to transmit CRSs may be distinguished from each other by the location of REs occupied by the CRS according to the CRS ports, and antenna ports configured to transmit UE-RSs may be UE-RS according to the UE-RS ports.
  • the RSs may be distinguished from each other by locations of REs occupied, and antenna ports configured to transmit CSI-RSs may be distinguished from each other by locations of REs occupied by the CSI-RSs according to the CSI-RS ports. Therefore, the term CRS / UE-RS / CSI-RS / TRS port may be used as a term for a pattern of REs occupied by CRS / UE-RS / CSI-RS / TRS in a certain resource region.
  • FIG. 1 illustrates an example of a radio frame structure used in a wireless communication system.
  • Figure 1 (a) shows a frame structure for frequency division duplex (FDD) used in the 3GPP LTE / LTE-A system
  • Figure 1 (b) is used in the 3GPP LTE / LTE-A system
  • the frame structure for time division duplex (TDD) is shown.
  • a radio frame used in a 3GPP LTE / LTE-A system has a length of 10 ms (307200 T s ) and consists of 10 equally sized subframes (subframes). Numbers may be assigned to 10 subframes in one radio frame.
  • Each subframe has a length of 1 ms and consists of two slots. 20 slots in one radio frame may be sequentially numbered from 0 to 19. Each slot is 0.5ms long.
  • the time for transmitting one subframe is defined as a transmission time interval (TTI).
  • the time resource may be classified by a radio frame number (also called a radio frame index), a subframe number (also called a subframe number), a slot number (or slot index), and the like.
  • the radio frame may be configured differently according to the duplex mode. For example, in the FDD mode, since downlink transmission and uplink transmission are divided by frequency, a radio frame includes only one of a downlink subframe or an uplink subframe for a specific frequency band. In the TDD mode, since downlink transmission and uplink transmission are separated by time, a radio frame includes both a downlink subframe and an uplink subframe for a specific frequency band.
  • Table 1 illustrates a DL-UL configuration of subframes in a radio frame in the TDD mode.
  • D represents a downlink subframe
  • U represents an uplink subframe
  • S represents a special (special) subframe.
  • the special subframe includes three fields of Downlink Pilot TimeSlot (DwPTS), Guard Period (GP), and Uplink Pilot TimeSlot (UpPTS).
  • DwPTS is a time interval reserved for downlink transmission
  • UpPTS is a time interval reserved for uplink transmission.
  • Table 2 illustrates the configuration of a special subframe.
  • FIG. 2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system.
  • a slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain and a plurality of resource blocks (RBs) in a frequency domain.
  • An OFDM symbol may mean a symbol period.
  • a signal transmitted in each slot may be represented by a resource grid including N DL / UL RB ⁇ N RB sc subcarriers and N DL / UL symb OFDM symbols.
  • N DL RB represents the number of resource blocks (RBs) in the downlink slot
  • N UL RB represents the number of RBs in the UL slot.
  • N DL RB and N UL RB depend on DL transmission bandwidth and UL transmission bandwidth, respectively.
  • N DL symb represents the number of OFDM symbols in the downlink slot
  • N UL symb represents the number of OFDM symbols in the UL slot.
  • N RB sc represents the number of subcarriers constituting one RB.
  • the OFDM symbol may be called an OFDM symbol, a Single Carrier Frequency Division Multiplexing (SC-FDM) symbol, or the like according to a multiple access scheme.
  • the number of OFDM symbols included in one slot may vary depending on the channel bandwidth and the length of the cyclic prefix (CP). For example, in case of a normal CP, one slot includes 7 OFDM symbols, whereas in case of an extended CP, one slot includes 6 OFDM symbols.
  • FIG. 2 illustrates a subframe in which one slot is composed of seven OFDM symbols for convenience of description, embodiments of the present invention can be applied to subframes having different numbers of OFDM symbols in the same manner. Referring to FIG.
  • each OFDM symbol includes N DL / UL RB ⁇ N RB sc subcarriers in the frequency domain.
  • the type of subcarriers may be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of reference signals, null subcarriers for guard band or direct current (DC) components.
  • the DC component is mapped to a carrier frequency f 0 during an OFDM signal generation process or a frequency upconversion process.
  • the carrier frequency is also called a center frequency ( f c ).
  • One RB is defined as N DL / UL symb contiguous OFDM symbols (e.g. 7) in the time domain and N RB sc (e.g. 12) contiguous in the frequency domain It is defined by subcarriers.
  • N DL / UL symb contiguous OFDM symbols (e.g. 7) in the time domain
  • N RB sc e.g. 12
  • a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB is composed of N DL / UL symb ⁇ N RB sc resource elements.
  • Each resource element in the resource grid may be uniquely defined by an index pair ( k , 1 ) in one slot.
  • k is an index given from 0 to N DL / UL RB ⁇ N RB sc -1 in the frequency domain
  • l is an index given from 0 to N DL / UL symb -1 in the time domain.
  • one RB is mapped to one physical resource block (PRB) and one virtual resource block (VRB), respectively.
  • the PRB is defined as N DL / UL symb (eg 7) consecutive OFDM symbols or SC-FDM symbols in the time domain, and N RB sc (eg 12) consecutive in the frequency domain Defined by subcarriers. Therefore, one PRB is composed of N DL / UL symb ⁇ N RB sc resource elements.
  • Two RBs each occupying N RB sc consecutive subcarriers in one subframe and one in each of two slots of the subframe, are referred to as a PRB pair.
  • Two RBs constituting a PRB pair have the same PRB number (or also referred to as a PRB index).
  • FIG. 3 illustrates a radio frame structure for transmission of a synchronization signal (SS).
  • FIG. 3 illustrates a radio frame structure for transmission of a synchronization signal and a PBCH in a frequency division duplex (FDD), and FIG. 3 (a) is configured as a normal cyclic prefix (CP).
  • FIG. 3B illustrates a transmission position of an SS and a PBCH in a radio frame, and FIG. 3B illustrates a transmission position of an SS and a PBCH in a radio frame configured as an extended CP.
  • FDD frequency division duplex
  • CP normal cyclic prefix
  • the UE When the UE is powered on or wants to access a new cell, the UE acquires time and frequency synchronization with the cell and detects a cell's physical layer cell identity N cell ID . Perform an initial cell search procedure. To this end, the UE receives a synchronization signal from the eNB, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), synchronizes with the eNB, and synchronizes with the eNB. , ID) and the like can be obtained.
  • a synchronization signal from the eNB for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), synchronizes with the eNB, and synchronizes with the eNB.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as OFDM symbol synchronization, slot synchronization, etc.
  • SSS is used for frame synchronization, cell group ID and / or cell CP configuration (i.e., general CP or extension). It is used to get usage information of CP).
  • PSS and SSS are transmitted in two OFDM symbols of every radio frame, respectively.
  • the SS may be configured in the first slot of subframe 0 and the first slot of subframe 5 in consideration of 4.6 ms, which is a Global System for Mobile Communication (GSM) frame length.
  • GSM Global System for Mobile Communication
  • the PSS is transmitted in the last OFDM symbol of the first slot of subframe 0 and the last OFDM symbol of the first slot of subframe 5, respectively, and the SSS is the second to second OFDM symbols and subframe of the first slot of subframe 0, respectively.
  • the boundary of the radio frame can be detected through the SSS.
  • the PSS is transmitted in the last OFDM symbol of the slot and the SSS is transmitted in the OFDM symbol immediately before the PSS.
  • the transmission diversity scheme of the SS uses only a single antenna port and is not defined in the standard.
  • the UE Since the PSS is transmitted every 5 ms, the UE detects the PSS to know that the corresponding subframe is one of the subframe 0 and the subframe 5, but the subframe may not know what the subframe 0 and the subframe 5 specifically. . Therefore, the UE does not recognize the boundary of the radio frame only by the PSS. That is, frame synchronization cannot be obtained only by PSS.
  • the UE detects the boundary of the radio frame by detecting the SSS transmitted twice in one radio frame but transmitted as different sequences.
  • the UE that performs a cell discovery process using PSS / SSS and determines a time and frequency parameter required to perform demodulation of DL signals and transmission of UL signals at an accurate time point is further determined from the eNB.
  • system information required for system configuration of the system must be obtained.
  • System information is configured by a Master Information Block (MIB) and System Information Blocks (SIBs).
  • MIB Master Information Block
  • SIBs System Information Blocks
  • Each system information block includes a collection of functionally related parameters, and includes a master information block (MIB), a system information block type 1 (SIB1), and a system information block type according to the included parameters.
  • MIB Master Information Block
  • SIB1 system information block type 1
  • SIB3 System Information Block Type 2
  • the MIB contains the most frequently transmitted parameters that are necessary for the UE to have initial access to the eNB's network.
  • the UE may receive the MIB via a broadcast channel (eg, PBCH).
  • PBCH broadcast channel
  • the MIB includes a downlink system bandwidth (dl-Bandwidth, DL BW), a PHICH configuration, and a system frame number (SFN). Therefore, the UE can know the information on the DL BW, SFN, PHICH configuration explicitly by receiving the PBCH.
  • the information that the UE implicitly (implicit) through the reception of the PBCH includes the number of transmit antenna ports of the eNB.
  • Information about the number of transmit antennas of the eNB is implicitly signaled by masking (eg, XOR operation) a sequence corresponding to the number of transmit antennas to a 16-bit cyclic redundancy check (CRC) used for error detection of the PBCH.
  • masking eg, XOR operation
  • CRC cyclic redundancy check
  • SIB1 includes not only information on time domain scheduling of other SIBs, but also parameters necessary for determining whether a specific cell is a cell suitable for cell selection. SIB1 is received by the UE through broadcast signaling or dedicated signaling.
  • the DL carrier frequency and the corresponding system bandwidth can be obtained by the MIB carried by the PBCH.
  • the UL carrier frequency and corresponding system bandwidth can be obtained through system information that is a DL signal. If the UE that receives the MIB does not have valid system information stored for the cell, the UE receives the value of the DL bandwidth (BW) in the MIB until the system information block type 2 (SystemInformationBlockType2, SIB2) is received. Applies to). For example, the UE may acquire a system information block type 2 (SystemInformationBlockType2, SIB2) to determine the entire UL system band that can be used for UL transmission through UL-carrier frequency and UL-bandwidth information in the SIB2. .
  • SystemInformationBlockType2, SIB2 system information block type 2
  • PSS / SSS and PBCH are transmitted only within a total of six RBs, that is, a total of 72 subcarriers, three on the left and right around a DC subcarrier within a corresponding OFDM symbol, regardless of the actual system bandwidth. Therefore, the UE is configured to detect or decode the SS and the PBCH regardless of the downlink transmission bandwidth configured for the UE.
  • the UE may perform a random access procedure to complete the access to the eNB. To this end, the UE may transmit a preamble through a physical random access channel (PRACH) and receive a response message for the preamble through a PDCCH and a PDSCH.
  • PRACH physical random access channel
  • additional PRACH transmission and contention resolution procedure such as PDCCH and PDSCH corresponding to the PDCCH may be performed.
  • the UE may perform PDCCH / PDSCH reception and PUSCH / PUCCH transmission as a general uplink / downlink signal transmission procedure.
  • DL subframe structure used in a wireless communication system.
  • the DL subframe is divided into a control region and a data region in the time domain.
  • up to three (or four) OFDM symbols located at the front of the first slot of a subframe correspond to a control region to which a control channel is allocated.
  • a resource region available for PDCCH transmission in a DL subframe is called a PDCCH region.
  • the remaining OFDM symbols other than the OFDM symbol (s) used as the control region correspond to a data region to which a Physical Downlink Shared CHannel (PDSCH) is allocated.
  • PDSCH region a resource region available for PDSCH transmission in a DL subframe.
  • Examples of DL control channels used in 3GPP LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), and the like.
  • PCFICH physical control format indicator channel
  • PDCCH physical downlink control channel
  • PHICH physical hybrid ARQ indicator channel
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used for transmission of a control channel within the subframe.
  • the PCFICH informs the UE of the number of OFDM symbols used in the corresponding subframe every subframe.
  • PCFICH is located in the first OFDM symbol.
  • the PCFICH is composed of four resource element groups (REGs), and each REG is distributed in the control region based on the cell ID.
  • One REG consists of four REs.
  • the set of OFDM symbols available for PDCCH in a subframe is given by the following table.
  • Subframe 1 and 6 for frame structure type 2 1, 2 2 MBSFN subframes on a carrier supporting PDSCH, configured with 1 or 2 cell-specfic antenna ports 1, 2 2 MBSFN subframes on a carrier supporting PDSCH, configured with 4 cell-specific antenna ports 2 2
  • Non-MBSFN subframes except subframe 6 for frame structure type 2) configured with positioning reference signals 1, 2, 3 2, 3 All other cases 1, 2, 3 2, 3, 4
  • a subset of downlink subframes in a radio frame on a carrier that supports PDSCH transmission may be set to MBSFN subframe (s) by a higher layer.
  • MBSFN subframe is divided into a non-MBSFN region and an MBSFN region, where the non-MBSFN region spans one or two OFDM symbols, where the length of the non-MBSFN region is given by Table 3.
  • Transmission in the non-MBSFN region of the MBSFN subframe uses the same CP as the cyclic prefix (CP) used for subframe zero.
  • the MBSFN region in the MBSFN subframe is defined as OFDM symbols not used in the non-MBSFN region.
  • the PCFICH carries a control format indicator (CFI) and the CFI indicates one of 1 to 3 values.
  • CFI control format indicator
  • the number 2, 3 or 4 of OFDM symbols that are spans of the DCI carried by is given by CFI + 1.
  • the PHICH carries a Hybrid Automatic Repeat Request (HARQ) ACK / NACK (acknowledgment / negative-acknowledgment) signal as a response to the UL transmission.
  • HARQ Hybrid Automatic Repeat Request
  • NACK acknowledgeledgment / negative-acknowledgment
  • the PHICH consists of three REGs and is cell-specific scrambled.
  • ACK / NACK is indicated by 1 bit, and the 1-bit ACK / NACK is repeated three times, and each repeated ACK / NACK bit is spread with a spreading factor (SF) 4 or 2 and mapped to the control region.
  • SF spreading factor
  • DCI downlink control information
  • DCI includes resource allocation information and other control information for the UE or UE group.
  • the transmission format and resource allocation information of a downlink shared channel (DL-SCH) may also be called DL scheduling information or a DL grant, and may be referred to as an uplink shared channel (UL-SCH).
  • the transmission format and resource allocation information is also called UL scheduling information or UL grant.
  • the DCI carried by one PDCCH has a different size and use depending on the DCI format, and its size may vary depending on a coding rate.
  • formats 0 and 4 for uplink and formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 3, and 3A are defined for uplink.
  • Hopping flag, RB allocation, modulation coding scheme (MCS), redundancy version (RV), new data indicator (NDI), transmit power control (TPC), and cyclic shift DMRS Control information such as shift demodulation reference signal (UL), UL index, CQI request, DL assignment index, HARQ process number, transmitted precoding matrix indicator (TPMI), and precoding matrix indicator (PMI) information
  • UL shift demodulation reference signal
  • UL index UL index
  • CQI request UL assignment index
  • HARQ process number transmitted precoding matrix indicator
  • PMI precoding matrix indicator
  • DCI format Description 0 Resource grants for the PUSCH transmissions (uplink)
  • One Resource assignments for single codeword PDSCH transmissions 1A Compact signaling of resource assignments for single codeword PDSCH 1B Compact signaling of resource assignments for single codeword PDSCH 1C
  • Very compact resource assignments for PDSCH e.g.
  • DCI formats defined in Table 4 In addition to the DCI formats defined in Table 4, other DCI formats may be defined.
  • a plurality of PDCCHs may be transmitted in the control region.
  • the UE may monitor the plurality of PDCCHs.
  • the eNB determines the DCI format according to the DCI to be transmitted to the UE, and adds a cyclic redundancy check (CRC) to the DCI.
  • CRC cyclic redundancy check
  • the CRC is masked (or scrambled) with an identifier (eg, a radio network temporary identifier (RNTI)) depending on the owner or purpose of use of the PDCCH.
  • an identifier eg, cell-RNTI (C-RNTI) of the UE may be masked to the CRC.
  • a paging identifier eg, paging-RNTI (P-RNTI)
  • P-RNTI paging-RNTI
  • SI-RNTI system information RNTI
  • RA-RNTI random access-RNTI
  • the DCI format that can be transmitted to the UE depends on a transmission mode (TM) configured in the UE.
  • TM transmission mode
  • not all DCI formats may be used for a UE set to a specific transmission mode, but only certain DCI format (s) corresponding to the specific transmission mode may be used.
  • the transmission mode is semi-statically configured by the upper layer so that the UE can receive a PDSCH transmitted according to one of a plurality of predefined transmission modes. .
  • the UE attempts to decode the PDCCH only in DCI formats corresponding to its transmission mode. In other words, not all DCI formats are simultaneously searched by the UE in order to keep the computational load of the UE due to the blind decoding attempt below a certain level.
  • Table 5 illustrates a transmission mode for configuring a multi-antenna technique and a DCI format in which the UE performs blind decoding in the transmission mode.
  • Table 5 shows the relationship between the PDCCH and the PDSCH configured by C-RNTI (Cell Radio Network Temporary Identifier).
  • C-RNTI Cell Radio Network Temporary Identifier
  • Table 5 lists the transmission modes 1 to 10, but other transmission modes may be defined in addition to the transmission modes defined in Table 5.
  • a UE set to transmission mode 9 decodes PDCCH candidates of a UE-specific search space (USS) into DCI format 1A and uses a common search space. space, CSS) and USS PDCCH candidates are decoded in DCI format 2C.
  • the UE may decode the PDSCH according to the DCI according to the DCI format that has been successfully decoded. If one succeeds in decoding the DCI in DCI format 1A in one of a plurality of PDCCH candidates, the UE decodes or transmits the PDSCH on the assumption that it is transmitted to the UE through the PDSCH from antenna ports 7-14 to eight layers. Alternatively, the PDSCH may be decoded on the assumption that a single layer from 8 is transmitted to the UE through the PDSCH.
  • the transmission mode is semi-statically configured by the upper layer so that the UE can receive a PDSCH transmitted according to one of a plurality of predefined transmission modes. .
  • the UE attempts to decode the PDCCH only in DCI formats corresponding to its transmission mode. In other words, not all DCI formats are simultaneously searched by the UE in order to keep the computational load of the UE due to the blind decoding attempt below a certain level.
  • the PDCCH is allocated to the first m OFDM symbol (s) in the subframe.
  • m is indicated by PCFICH as an integer of 1 or more.
  • the PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs).
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions.
  • the CCE corresponds to a plurality of resource element groups (REGs). For example, one CCE corresponds to nine REGs and one REG corresponds to four REs.
  • Four QPSK symbols are mapped to each REG.
  • the resource element RE occupied by the reference signal RS is not included in the REG. Thus, the number of REGs within a given OFDM symbol depends on the presence of RS.
  • the REG concept is also used for other downlink control channels (ie, PCFICH and PHICH).
  • the DCI format and the number of DCI bits are determined according to the number of CCEs.
  • CCEs are numbered and used consecutively, and to simplify the decoding process, a PDCCH having a format consisting of n CCEs can be started only in a CCE having a number corresponding to a multiple of n.
  • the number of CCEs used for transmission of a specific PDCCH is determined by the network or eNB according to the channel state. For example, in case of PDCCH for a UE having a good downlink channel (eg, adjacent to an eNB), one CCE may be sufficient. However, in case of PDCCH for a UE having a poor channel (eg, near the cell boundary), eight CCEs may be required to obtain sufficient robustness.
  • the power level of the PDCCH may be adjusted according to the channel state.
  • a set of CCEs in which a PDCCH can be located for each UE is defined.
  • the collection of CCEs in which a UE can discover its PDCCH is referred to as a PDCCH search space, simply a search space (SS).
  • An individual resource to which a PDCCH can be transmitted in a search space is called a PDCCH candidate.
  • the collection of PDCCH candidates that the UE will monitor is defined as a search space.
  • the search space may have a different size, and a dedicated search space and a common search space are defined.
  • the dedicated search space is a UE-specific search space (USS) and is configured for each individual UE.
  • a common search space (CSS) is set for a plurality of UEs.
  • the following table illustrates the aggregation levels that define the search spaces.
  • m ' m for the common search space PDCCH
  • the monitoring UE indicates the carrier indicator field.
  • n CI the carrier indicator field (CIF) value
  • M (L) is the number of PDCCH candidates to monitor at the aggregation level L within a given search space
  • the carrier aggregation field value is the serving cell index ( ServCellIndex). ) and it may be the same.
  • Y (A ⁇ Y k -1) mod D"
  • the eNB sends the actual PDCCH (DCI) on any PDCCH candidate in the search space, and the UE monitors the search space to find the PDCCH (DCI).
  • monitoring means attempting decoding of each PDCCH in a corresponding search space according to all monitored DCI formats.
  • the UE may detect its own PDCCH by monitoring the plurality of PDCCHs. Basically, since the UE does not know where its PDCCH is transmitted, every Pframe attempts to decode the PDCCH until every PDCCH of the corresponding DCI format has detected a PDCCH having its own identifier. It is called blind detection (blind decoding).
  • a specific PDCCH is masked with a cyclic redundancy check (CRC) with a Radio Network Temporary Identity (RNTI) of "A", a radio resource (eg, frequency location) of "B” and a transmission of "C".
  • CRC cyclic redundancy check
  • RNTI Radio Network Temporary Identity
  • format information eg, transport block size, modulation scheme, coding information, etc.
  • FIG. 5 shows an example of an uplink (UL) subframe structure used in a wireless communication system.
  • a UL subframe may be divided into a control region and a data region in the frequency domain.
  • One or several physical uplink control channels may be allocated to the control region to carry uplink control information (UCI).
  • One or several physical uplink shared channels may be allocated to a data region of a UL subframe to carry user data.
  • subcarriers having a long distance based on a direct current (DC) subcarrier are used as a control region.
  • subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of uplink control information.
  • the DC subcarrier is a component that is not used for signal transmission and is mapped to a carrier frequency f 0 during frequency upconversion.
  • the PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency in one subframe, and the RBs belonging to the RB pair occupy different subcarriers in two slots.
  • the PUCCH allocated in this way is expressed as that the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, if frequency hopping is not applied, RB pairs occupy the same subcarrier.
  • PUCCH may be used to transmit the following control information.
  • SR Service Request: Information used for requesting an uplink UL-SCH resource. It is transmitted using OOK (On-Off Keying) method.
  • HARQ-ACK A response to a PDCCH and / or a response to a downlink data packet (eg, codeword) on a PDSCH. This indicates whether the PDCCH or PDSCH is successfully received.
  • HARQ-ACK 1 bit is transmitted in response to a single downlink codeword
  • HARQ-ACK 2 bits are transmitted in response to two downlink codewords.
  • HARQ-ACK response includes a positive ACK (simple, ACK), negative ACK (hereinafter, NACK), DTX (Discontinuous Transmission) or NACK / DTX.
  • the term HARQ-ACK is mixed with HARQ ACK / NACK, ACK / NACK.
  • CSI Channel State Information
  • CQI channel quality information
  • PMI precoding matrix indicator
  • PTI precoding type indicator
  • RI rank indication
  • MIMO Multiple Input Multiple Output
  • RI means the number of streams or the number of layers that a UE can receive through the same time-frequency resource.
  • PMI is a value reflecting a space characteristic of a channel and indicates an index of a precoding matrix that a UE prefers for downlink signal transmission based on a metric such as SINR.
  • the CQI is a value indicating the strength of the channel and typically indicates the received SINR that the UE can obtain when the eNB uses PMI.
  • a typical wireless communication system performs data transmission or reception (in frequency division duplex (FDD) mode) through one DL band and one UL band corresponding thereto, or transmits a predetermined radio frame.
  • the time domain is divided into an uplink time unit and a downlink time unit, and data transmission or reception is performed through an uplink / downlink time unit (in a time division duplex (TDD) mode).
  • FDD frequency division duplex
  • TDD time division duplex
  • Carrier aggregation performs DL or UL communication by using a plurality of carrier frequencies, and performs DL or UL communication by putting a fundamental frequency band divided into a plurality of orthogonal subcarriers on one carrier frequency. It is distinguished from an orthogonal frequency division multiplexing (OFDM) system.
  • OFDM orthogonal frequency division multiplexing
  • each carrier aggregated by carrier aggregation is called a component carrier (CC).
  • three 20 MHz CCs may be gathered in the UL and the DL to support a 60 MHz bandwidth.
  • Each of the CCs may be adjacent or non-adjacent to each other in the frequency domain.
  • the bandwidth of each CC may be determined independently.
  • asymmetrical carrier aggregation in which the number of UL CCs and the number of DL CCs are different is possible.
  • a DL / UL CC limited to a specific UE may be called a configured serving UL / DL CC at a specific UE.
  • a "cell" associated with a radio resource is defined as a combination of DL resources and UL resources, that is, a combination of a DL CC and a UL CC.
  • the cell may be configured with DL resources alone or with a combination of DL resources and UL resources.
  • the linkage between the carrier frequency of the DL resource (or DL CC) and the carrier frequency of the UL resource (or UL CC) is indicated by system information.
  • SIB2 System Information Block Type 2
  • the carrier frequency means a center frequency of each cell or CC.
  • a cell operating on a primary frequency is referred to as a primary cell (Pcell) or a PCC
  • a cell operating on a secondary frequency (or SCC) is referred to as a secondary cell.
  • cell, Scell) or SCC The carrier corresponding to the Pcell in downlink is called a DL primary CC (DL PCC), and the carrier corresponding to the Pcell in the uplink is called a UL primary CC (DL PCC).
  • Scell refers to a cell that can be configured after RRC (Radio Resource Control) connection establishment is made and can be used for providing additional radio resources.
  • RRC Radio Resource Control
  • the Scell may form a set of serving cells for the UE with the Pcell.
  • the carrier corresponding to the Scell in downlink is called a DL secondary CC (DL SCC)
  • the carrier corresponding to the Scell in the uplink is called a UL secondary CC (UL SCC).
  • DL SCC DL secondary CC
  • UL SCC UL secondary CC
  • the eNB may be used for communication with the UE by activating some or all of the serving cells configured in the UE or by deactivating some.
  • the eNB may change a cell that is activated / deactivated and may change the number of cells that are activated / deactivated.
  • a cell that is not deactivated may be referred to as a Pcell unless a global reset of cell allocation for the UE is performed.
  • a cell that an eNB can freely activate / deactivate may be referred to as an Scell.
  • Pcell and Scell may be classified based on control information. For example, specific control information may be set to be transmitted / received only through a specific cell. This specific cell may be referred to as a Pcell, and the remaining cell (s) may be referred to as an Scell.
  • a configured cell is a cell in which carrier aggregation is performed for a UE based on measurement reports from other eNBs or UEs among eNB cells, and is configured for each UE.
  • the cell configured for the UE may be referred to as a serving cell from the viewpoint of the UE.
  • resources for ACK / NACK transmission for PDSCH transmission are reserved in advance.
  • the activated cell is a cell configured to be actually used for PDSCH / PUSCH transmission among cells configured in the UE, and is performed on a cell in which CSI reporting and SRS transmission are activated for PDSCH / PUSCH transmission.
  • the deactivated cell is a cell configured not to be used for PDSCH / PUSCH transmission by the operation of a eNB or a timer. When the cell is deactivated, CSI reporting and SRS transmission are also stopped in the cell.
  • the serving cell index is a short identity used to identify the serving cell, for example, one of an integer from 0 to 'the maximum number of carrier frequencies that can be set to the UE at one time-1'. May be assigned to one serving cell as the serving cell index. That is, the serving cell index may be referred to as a logical index used to identify a specific serving cell only among cells allocated to the UE, rather than a physical index used to identify a specific carrier frequency among all carrier frequencies.
  • the term cell used in carrier aggregation is distinguished from the term cell which refers to a certain geographic area where communication service is provided by one eNB or one antenna group.
  • a cell referred to in the present invention refers to a cell of carrier aggregation which is a combination of a UL CC and a DL CC.
  • the PDCCH carrying the UL / DL grant and the corresponding PUSCH / PDSCH are transmitted in the same cell.
  • the PDCCH for the DL grant for the PDSCH to be transmitted in a specific DL CC is transmitted in the specific CC
  • the PDSCH for the UL grant for the PUSCH to be transmitted in the specific UL CC is determined by the specific CC. It is transmitted on the DL CC linked with the UL CC.
  • the PDCCH for the DL grant for the PDSCH to be transmitted in a specific CC is transmitted in the specific CC
  • the PDSCH for the UL grant for the PUSCH to be transmitted in the specific CC is transmitted in the specific CC.
  • UL / DL grant can be allowed to be transmitted in a serving cell having a good channel condition.
  • cross-carrier scheduling when a cell carrying UL / DL grant, which is scheduling information, and a cell in which UL / DL transmission corresponding to a UL / DL grant is performed, this is called cross-carrier scheduling.
  • a case where a cell is scheduled from a corresponding cell itself, that is, itself and a case where a cell is scheduled from another cell is called self-CC scheduling and cross-CC scheduling, respectively.
  • 3GPP LTE / LTE-A may support a merge of multiple CCs and a cross carrier-scheduling operation based on the same for improving data rate and stable control signaling.
  • cross-carrier scheduling When cross-carrier scheduling (or cross-CC scheduling) is applied, downlink allocation for DL CC B or DL CC C, that is, PDCCH carrying DL grant is transmitted to DL CC A, and the corresponding PDSCH is DL CC B or DL CC C may be transmitted.
  • a carrier indicator field For cross-CC scheduling, a carrier indicator field (CIF) may be introduced.
  • the presence or absence of the CIF in the PDCCH may be set in a semi-static and UE-specific (or UE group-specific) manner by higher layer signaling (eg, RRC signaling).
  • UE-RS, CSI-RS, CRS, etc. are transmitted in the same location, so the UE delay delay of UE-RS port, CSI-RS port, CRS port Doppler spread, frequency shift, average received power, reception timing, etc. may not be considered.
  • CoMP Coordinatd Multi-Point
  • a communication system to which CoMP (Coordinated Multi-Point) communication technology is applied in which more than one node can simultaneously participate in communication with a UE, a PDCCH port, a PDSCH port, a UE-RS port, a CSI-RS port, and / or The characteristics of the CRS port may be different. For this reason, the concept of a quasi co-located antenna port is introduced for a mode in which multiple nodes are likely to participate in communication (hereinafter, CoMP mode).
  • quadsi co-located or “quasi co-location” (QCL) may be defined in terms of antenna ports as follows: two antenna ports If they are pseudo co-located, the UE assumes that large-scale properties of the signal received from one of the two antenna ports can be inferred from the signal received from the other antenna port. can do.
  • the large scale attributes consist of delay spread, Doppler spread, frequency shift, average received power and / or reception timing.
  • QCL may be defined in terms of channels as follows: If two antenna ports are pseudo co-located, the UE receives the large attributes of the channel that conveys a symbol on one of the two antenna ports. It can be assumed that the large properties of a given signal can be inferred from the large properties of a channel carrying a symbol on another antenna port.
  • the large scale attributes consist of delay spreading, Doppler spreading, Doppler transitions, average gain and / or average delay.
  • the QCL may follow one of the above definitions.
  • the definition of QCL may be modified in such a way that antenna ports for which the QCL hypothesis holds in a similar fashion may be assumed to be in the same-position.
  • the QCL concept may be defined in such a manner that the UE assumes antenna ports of the same transmission point.
  • the UE cannot assume the same large attributes between the antenna ports for non-quasi co-located (NQC) antenna ports.
  • NQC non-quasi co-located
  • a typical UE must perform independent processing for each set NQC antenna for timing acquisition and tracking, frequency offset estimation and compensation, delay estimation, and Doppler correction. do.
  • the UE has the advantage that it can perform the following operations:
  • the UE filters the power-delay-profile, delay spreading and Doppler spectrum, and Doppler spread estimation results for one port for channel estimation (e.g., The same applies to Wiener filters, etc .;
  • the UE may apply time and frequency synchronization for one port and then apply the same synchronization to demodulation of another port;
  • the UE may average reference signal received power (RSRP) measurements across two or more antenna ports.
  • RSRP reference signal received power
  • the UE when the UE receives a specific DMRS-based downlink-related DCI format (eg, DCI format 2C) through PDCCH / EPDCCH, the UE performs channel estimation for the corresponding PDSCH through the configured DMRS sequence, and then the data. Demodulation is performed.
  • the DMRS port configuration received by the UE through this DL scheduling grant can assume a specific RS (e.g., a specific CSI-RS or a specific CRS or its own DL serving cell CRS, etc.)
  • DMRS-based receiver processing performance can be improved by applying the estimate (s) of the large-scale attributes estimated from the specific RS port as it is during channel estimation.
  • FIG. 6 illustrates a cell specific reference signal (CRS) and a user specific reference signal (UE-RS).
  • CRS cell specific reference signal
  • UE-RS user specific reference signal
  • FIG. 6 shows the REs occupied by CRS (s) and UE-RS (s) in an RB pair of subframes having normal CP.
  • the CRS is transmitted over the entire downlink bandwidth in all downlink subframes in a cell supporting PDSCH transmission and configured in the eNB. It is transmitted from all antenna ports.
  • the CRS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
  • the control channel is allocated to a resource to which no CRS is allocated in the control region, and the data channel is also allocated to a resource to which CRS is not allocated in the data region.
  • the UE may measure CSI using CRS, and may demodulate a signal received through PDSCH in a subframe including the CRS using CRS. That is, the eNB transmits a CRS at a predetermined position in each RB in all RBs, and the UE detects a PDSCH after performing channel estimation based on the CRS. For example, the UE measures a signal received at a CRS RE, and uses a ratio of the measured signal and the received energy of each RE to which the PDSCH of the received energy of the CRS RE is mapped to the PDSCH signal from the RE to which the PDSCH is mapped. Can be detected.
  • UE-RS UE-specific RS
  • CSI-RS channel state information
  • UE-RS can be regarded as a kind of DRS. Since UE-RS and CRS are used for demodulation, they can be referred to as demodulation RS in terms of use. Since CSI-RS and CRS are used for channel measurement or channel estimation, they can be referred to as measurement RS in terms of use.
  • the UE-RS is present if PDSCH transmission is associated with the corresponding antenna port and is a valid reference only for demodulation of the PDSCH.
  • the UE-RS is transmitted only on the RBs to which the corresponding PDSCH is mapped.
  • the UE-RS is configured to be transmitted only in the RB (s) to which the PDSCH is mapped in the subframe in which the PDSCH is scheduled, unlike the CRS configured to be transmitted in every subframe regardless of the presence or absence of the PDSCH.
  • the UE-RS is transmitted only through the antenna port (s) respectively corresponding to the layer (s) of the PDSCH. Therefore, overhead of RS can be reduced compared to CRS.
  • n s is a slot number in one radio frame and is one of integers from 0 to 19.
  • Sequence for Normal CP Is given according to the following table.
  • the UE-RS sequence r ( m ) is defined as follows.
  • N max, DL RB is the largest downlink bandwidth setting and is expressed as a multiple of N RB sc .
  • c ( i ) is a pseudo-random sequence, defined by a length-31 Gold sequence.
  • Equation 3 a pseudo-random sequence generator for generating c ( i ) is initialized to c init according to the following equation at the beginning of each subframe.
  • n SCID is 0 unless otherwise specified, and for SCSCH transmission on antenna ports 7 or 8, n SCID is given by DCI format 2B or 2C associated with PDSCH transmission.
  • DCI format 2B is a DCI format for resource assignment for PDSCH using up to two antenna ports with UE-RS
  • DCI format 2C is a PDSCH using up to 8 antenna ports with UE-RS.
  • the reference-signal sequence r l, ns ( m ) for the CRS is defined as follows.
  • N max, DL RB is the largest downlink bandwidth setting and is expressed as a multiple of N RB sc .
  • n s is a slot number in a radio frame and l is an OFDM symbol number in a slot.
  • the pseudo-random sequence c ( i ) is defined by equation (4).
  • the pseudo-random sequence generator is initialized according to the following equation at the start of each OFDM symbol.
  • N cell ID means a physical layer cell identifier
  • CRS is defined in a PRB pair.
  • the reference-signal sequence r l, ns ( m ) for CRS is complex modulation symbols a (p) k used as reference symbols for antenna port p in slot n s according to the following equation: mapped to , l .
  • v and v shift define the position in the frequency domain for the other RSs, and v is given by the following equation.
  • the amount of PDCCH to be transmitted by the eNB gradually increases.
  • the size of the control region in which the PDCCH can be transmitted is the same as before, the PDCCH transmission serves as a bottleneck of system performance.
  • Channel quality can be improved by introducing the above-described multi-node system, applying various communication techniques, etc.
  • introduction of a new control channel is required.
  • PDSCH region data region
  • PDCCH region existing control region
  • EPDCCH enhanced PDCCH
  • the EPDCCH may be set in the latter OFDM symbols starting from the configured OFDM symbol, not the first OFDM symbols of the subframe.
  • the EPDCCH may be configured using continuous frequency resources or may be configured using discontinuous frequency resources for frequency diversity.
  • the PDCCH is transmitted through the same antenna port (s) as the antenna port (s) configured for transmission of the CRS, and the UE configured to decode the PDCCH demodulates or decodes the PDCCH using the CRS. can do.
  • the EPDCCH may be transmitted based on a demodulated RS (hereinafter, referred to as DMRS). Accordingly, the UE can decode / demodulate the PDCCH based on the CRS and the EPDCCH can decode / decode the DMRS based on the DMRS.
  • the DMRS associated with the EPDCCH is transmitted on the same antenna port p ⁇ ⁇ 107,108,109,110 ⁇ as the EPDCCH physical resource, and is present for demodulation of the EPDCCH only if the EPDCCH is associated with that antenna port, and on the PRB (s) to which the EDCCH is mapped. Only sent.
  • REs occupied by UE-RS (s) at antenna ports 7 or 8 may be occupied by DMRS (s) at antenna ports 107 or 108 on the PRB to which EPDCCH is mapped, and antenna ports 9 or 10 REs occupied by UE-RS (s) of may be occupied by DMRS (s) of antenna port 109 or 110 on a PRB to which EPDCCH is mapped.
  • the DMRS for demodulation of the EPDCCH if the type of EPDCCH and the number of layers are the same, a certain number of REs for each RB pair are used for DMRS transmission regardless of the UE or cell. do.
  • the higher layer signal may configure the UE as one or two EPDCCH-PRB-sets for EPDCCH monitoring.
  • PRB-pairs corresponding to one EPDCCH-PRB-set are indicated by higher layers.
  • Each EPDCCH-PRB set consists of a set of ECCEs numbered from 0 to N ECCE, p, k ⁇ 1.
  • N ECCE, p, k is the number of ECCEs in the EPDCCH-PRB-set p of subframe k .
  • Each EPDCCH-PRB-set may be configured for localized EPDCCH transmission or distributed EPDCCH transmission.
  • the UE monitors a set of EPDCCH candidates on one or more activated cells, as set by the higher layer signal for control information.
  • EPDCCH UE specific search spaces For each serving cell, the subframes for which the UE will monitor EPDCCH UE specific search spaces are set by the higher layer.
  • EPDCCH UE-specific search space ES (L) k is defined as a collection of EPDCCH candidates.
  • n CI a carrier indicator field (CIF) value
  • the carrier indicator field value is the same as a serving cell index ( servCellIndex ).
  • m 0, 1, ..., M (L) p -1, and M (L) p is the number of EPDCCH candidates to monitor at the aggregation level L in the EPDDCH-PRB-set p .
  • n s is a slot number in a radio frame.
  • the UE does not monitor the EPDCCH candidate.
  • the EPDCCH is transmitted using an aggregation of one or several consecutive advanced control channel elements (ECCEs).
  • Each ECCE consists of a plurality of enhanced resource element groups (ERREGs).
  • EREG is used to define the mapping of advanced control channels to REs.
  • There are 16 REGs per PRB pair which consist of a PRB in a first slot and a PRB in a second slot of one subframe, and the 16 REGs are numbered from 0 to 15.
  • the remaining REs except for the REs carrying the DMRS for demodulation of the EPDCCH (hereinafter, referred to as EPDCCH DMRS) are first cycled from 0 to 15 in increasing order of frequency, and then in increasing order of time.
  • the PRB all RE pair except for the RE to carry of the inner RE EPDCCH DMRS are and have any one of the number of 15, an integer from 0, to any RE having the number i to configure the EREG the number i do.
  • the EREGs are distributed on the frequency and time axis within the PRB pair, and the EPDCCH transmitted using the aggregation of one or more ECCEs each consisting of a plurality of EREGs is also distributed on the frequency and time axis within the PRB pair. To be located.
  • the number of ECCEs used for one EPDCCH depends on the EPDCCH formats as given by Table 8, and the number of EREGs per ECCE is given by Table 9.
  • Table 8 illustrates the supported EPDCCH formats
  • Table 9 illustrates the number of REGs N EREG ECCE per ECCE . Both localized and distributed transports are supported.
  • Normal cyclic prefix Extended cyclic prefix Normal subframe Special subframe, configuration 3, 4, 8 Special subframe, configuration1, 2, 6, 7, 9 Normal subframe Special subframe, configuration1, 2, 3, 5, 6 4 8
  • the EPDCCH may use localized transmission or distributed transmission, depending on the mapping of ECCEs to EREGs and PRB pairs. One or two sets of PRB pairs for which the UE monitors EPDCCH transmission may be set. All EPDCCH candidates in the EPDCCH set S p (ie, EPDCCH-PRB-set) use only localized transmissions or only distributed transmissions, as set by the higher layer.
  • ECCEs available for transmission of EPDCCHs in the EPDCCH set S p in subframe k are numbered from 0 to N ECCE, p, k ⁇ 1.
  • ECCE number n corresponds to the following EREG (s):
  • PRB indices for variance mapping ( n + j max (1, N Sp RB / N EREG ECCE )) EREGs numbered floor ( n / N Sm RB ) + jN ECCE RB in mod N Sp RB .
  • N EREG ECCE is the number of EREGs per ECCE
  • N ECCE RB 16 / N EREG ECCE is the number of ECCEs per resource block pair.
  • the PRB pairs that make up the EPDCCH set S p are assumed to be numbered in ascending order from 0 to N Sp RB ⁇ 1.
  • n EPDCCH for a particular UE is a downlink resource element ( k ,) that satisfies all of the following criteria, in a pair of physical resource blocks configured for possible EPDCCH transmission of the EPDCCH set S 0 . is defined as the number of l )
  • l EPDCCHStart is determined based on a CFI value carried by higher layer signaling epdcch - StartSymbol -r11 , higher layer signaling pdsch-Start-r11 , or PCFICH.
  • the resource elements ( k , l ) satisfying the criterion are mapped to antenna port p in order of first increasing index k , and then increasing index l , starting from the first slot in the subframe. Ends in the first slot.
  • n ' n ECCE, low mod N ECCE RB + n RNTI mod min ( N ECCE EPDCCH , N ECCE RB ) and Table 10.
  • n ECCE, low is the lowest ECCE index used by this EPDCCH transmission in the EPDCCH set
  • n RNTI corresponds to the RNTI associated with the EPDCCH malleability
  • N ECCE EPDCCH is the number of ECCEs used for the EPDCCH .
  • each resource element in the EREG is associated with one of the two antenna ports in an alternating manner.
  • the two antenna ports are p ⁇ ⁇ 107,108 ⁇ .
  • MTC machine type communication
  • MTC mainly refers to information exchange performed between a machine and an eNB without human intervention or with minimal human intervention.
  • MTC can be used for data communication such as meter reading, level measurement, surveillance camera utilization, measurement / detection / reporting such as inventory reporting of vending machines, etc. It may be used for updating an application or firmware.
  • the amount of transmitted data is small, and uplink / downlink data transmission or reception (hereinafter, transmission / reception) sometimes occurs. Due to the characteristics of the MTC, for the UE for MTC (hereinafter referred to as MTC UE), it is efficient to lower the UE manufacturing cost and reduce battery consumption at a low data rate.
  • MTC UEs are less mobile, and thus, the channel environment is hardly changed.
  • the MTC UE is likely to be located at a location that is not covered by a normal eNB, for example, a basement, a warehouse, a mountain, and the like.
  • the signal for the MTC UE is better to have a wider coverage than the signal for a legacy UE (hereinafter, a legacy UE).
  • the MTC UE is likely to require a signal with a wider coverage than the legacy UE. Therefore, when the PDCCH, PDSCH, etc. are transmitted to the MTC UE in the same manner as the eNB transmits to the legacy UE, the MTC UE has difficulty in receiving them. Therefore, in order to enable the MTC UE to effectively receive a signal transmitted by the eNB, the eNB may select a subframe repetition (subframe having a signal) when transmitting a signal to the MTC UE having a coverage issue. It is proposed to apply a technique for coverage enhancement such as repetition), subframe bundling, and the like. For example, a PDCCH and / or PDSCH may be transmitted through a plurality of subframes (eg, about 100) to an MTC UE having a coverage problem.
  • the data channel e.g. PDSCH, PUSCH
  • / or control channel e.g. M-PDCCH, PUCCH, PHICH
  • CE coverage enhancement
  • control / data channels may be transmitted using techniques such as cross-subframe channel estimation, frequency (narrowband) hopping, and the like.
  • cross-subframe channel estimation means a channel estimation method that uses not only reference signals in subframes having corresponding channels but also reference signals in neighboring subframe (s).
  • the MTC UE may, for example, require a CE of up to 15 dB.
  • a CE of up to 15 dB.
  • devices such as sensors and meters may require high CE because they are less likely to be located in shadowed areas with less mobility and less data transmission and reception.
  • wearable devices such as smart watches, may have mobility and are likely to be located in places other than shaded areas with a relatively high amount of data transmission and reception. Therefore, not all MTC UEs require a high level of CE, and the capabilities required may vary depending on the type of MTC UE.
  • FIG. 7 shows an example of a signal band for an MTC.
  • the center of the cell e.g. six center PRBs
  • multiple subbands for MTC are placed in one subframe, so that the UEs use different subbands, or the UEs use the same subband. It is also possible to use a band but use a subband other than the subband consisting of six center PRBs.
  • the MTC UE cannot properly receive the legacy PDCCH transmitted through the entire system band, and the PDCCH for the MTC UE is transmitted in the OFDM symbol region in which the legacy PDCCH is transmitted due to a multiplexing issue with the PDCCH transmitted to other UEs. It may not be desirable.
  • One way to solve this problem is to introduce a control channel transmitted in a subband in which the MTC operates for the MTC UE.
  • the existing EPDCCH may be used as it is.
  • the M-PDCCH for the MTC UE which is a control channel in which the existing PDCCH / EPDCCH is modified, may be introduced.
  • M-PDCCH the conventional EPDCCH or M-PDCCH for such a low-complexity MTC or normal complexity MTC UE is referred to as a physical downlink control channel as M-PDCCH.
  • MTC-EPDCCH is used hereinafter as M-PDCCH.
  • an environment in which the MTC UE operates through a narrow bandwidth of about 200 KHz may be considered.
  • Such an MTC UE that is, an MTC UE capable of operating only within a narrow bandwidth, may operate backward compatible in a legacy cell having a bandwidth wider than 200 KHz.
  • a clean frequency band without legacy cells may be deployed for this MTC UE only.
  • NB in-band narrowband
  • IoT Internet of Things
  • a radio resource of one RB size operating with NB-IoT is referred to as an NB-IoT cell
  • an LTE radio resource in which communication occurs according to an LTE system is called an LTE cell
  • a GSM radio resource in which communication occurs according to a GSM system is called a GSM cell.
  • the in-band NB IoT cell can operate in a 200 kHz bandwidth (without guard-band consideration) or 180 kHz bandwidth (without guard-band consideration) within the system band of the LTE cell.
  • NB-IoT can support the operation of three different modes:
  • FDMA with Gaussian minimum shift keying (GMSK) modulation For uplink, two options are considered: FDMA with Gaussian minimum shift keying (GMSK) modulation, and SC-FDMA including single-tone transmission as a special case of SC-FDMA.
  • GMSK Gaussian minimum shift keying
  • the expression “assuming” may mean that the subject transmitting the channel transmits the channel so as to correspond to the "assuming”.
  • the subject receiving the channel may mean that the channel is received or decoded in a form conforming to the "home", provided that the channel is transmitted to conform to the "home”.
  • the present invention proposes a PBCH transmission scheme for an IoT UE in an NB-LTE environment in which an MTC UE operates in a narrow band of about 200 KHz.
  • a UE operating in an NB-LTE system i.e., an IoT UE or an NB-LTE UE
  • six PRBs are transmitted for transmission of a PBCH in an NB-LTE system. It may not be used as it is, and the NB-LTE UE may not receive the legacy PBCH. Therefore, there is a need for a new PBCH transmitted within narrow-bandwidth for NB-LTE UEs.
  • the present invention proposes a PBCH transmission scheme for an MTC UE in an in-band NB LTE environment and a stand-alone NB LTE environment.
  • the present invention describes the transmission of the PBCH, but the present invention can be applied to the transmission of channels other than the PBCH (eg, PDCCH / EPDCCH / M-PDCCH, PDSCH).
  • channels other than the PBCH eg, PDCCH / EPDCCH / M-PDCCH, PDSCH.
  • the transmission of the PBCH in the NB-LTE may be a CRS based transmission.
  • the PBCH is transmitted through the antenna port through which the CRS is transmitted.
  • the CRS may be an RS using an antenna port, an RE location, and / or a reference signal (RS) sequence of the legacy CRS.
  • the UE may perform reception of the PBCH using legacy CRS.
  • the CRS may be transmitted in a resource region (eg, a subframe region) in which the PBCH is transmitted.
  • the CRS may be transmitted through all downlink subframe regions, that is, every subframe.
  • the number of PRB resources is located in the NB-LTE resource within the system bandwidth of the legacy cell where the legacy CRS and the NB-LTE share resources (or the number of times from the center frequency of the legacy cell). Location) and the cell ID of the legacy cell. To this end, the following method may be considered.
  • the legacy cell ID is equal to the cell ID of the NB-LTE cell, or assumes that the legacy cell ID can be inferred when the UE can detect the ID of the NB-LTE cell by a constant function
  • NB-LTE PBCH Fixed PRB location for NB-LTE PBCH transmission: For example, one may assume that the NB-LTE PBCH is always transmitted centered at a distance of 36 + 6 subcarriers from the center; or
  • NB-LTE PRB Blind detection of PRB for NB-LTE (hereinafter referred to as NB-LTE PRB) using CRS detection for PRB
  • the legacy cell ID is transmitted by the synchronization signal of the NB-LTE, or that the legacy cell ID is known to the UE by an additional signal, or may be assumed to be a fixed value.
  • PBCH transmission in NB-LTE may be transmitted on a new RS.
  • the UE may not know the cell ID of the legacy cell in which it operates and / or the PRB location in which the NB-LTE operates in the legacy cell, in which case the UE may receive the legacy CRS. Because there may not be.
  • This new RS may be a structure such as an existing DMRS, that is, a UE-RS, or may be an RS having a new structure.
  • the new RS may be made by moving several subcarriers or several OFDM symbols on the frequency axis and / or time axis to position the REs of the existing RS, or may be configured as a combination of existing RSs.
  • the pattern of DMRS used in the extended CP may be used as a new RS pattern in the regular CP.
  • the new RS may be similar to the existing RS but different from the existing RS pattern and the new RS pattern. Since the PBCH is a channel that a UE in a cell should receive in common, this new RS may be a cell-specific RS.
  • a new RS In the case of in-band NB LTE, since the legacy CRS should be transmitted on the NB IoT band, a new RS must be transmitted in addition to the legacy CRS.
  • a new RS In the case of standalone NB LTE, only a new RS can be transmitted without transmitting a legacy CRS on the corresponding NB IoT band.
  • the new RS becomes the default RS and the legacy CRS assumes only rate-matching purposes, such as conventional zero-power CSI.
  • the value for the legacy CRS setting (cell ID% 6, where% is the modulo operator) is transmitted via the MIB or SIB.
  • the UE may assume that the CRS configuration is a zero-power CRS as if the neighbor cell is transmitting the CRS.
  • Such zero-power CRS may also be used for CRS or PRS.
  • this concept of zero-power RS, used for rate-matching in legacy RS REs can be applied to PRS as well as CRS.
  • legacy PRS REs can be used for rate-matching.
  • the zero-power CRS or zero-power PRS may vary for each subframe.
  • the eNB may signal configuration for subframes with zero-power CRS or zero-power PRS through MIB / SIB or the like. Since the NB LTE UE will not use legacy CRS, if there is a zero-power CRS configuration, the NB LTE UE does not receive the CRS in the CRS REs and only uses it for rate-matching of data. In the MBSFN subframe, since the legacy CRS is not transmitted except for the legacy control region, the CRS REs need not be rate-matched. Thus, in subframes that cannot be configured as MBSFN subframes, data is rate-matched in the corresponding CRS REs by applying a zero-power CRS.
  • the UE may apply the zero-power CRS only in non-MBSFN capable subframes, eg, subframes # 0, # 1, # 4, and # 9 and other subframes.
  • Zero-power CRS is not assumed when this NB LTE UE is set to a valid subframe that can be used. In other words, the UE assumes that a zero-power CRS exists only in non-MBSFN capable subframes (ie, subframes that cannot be set for MBSFN), and MBSFN capable subframes (ie, subframes that can be set for MBSFN). Can assume that there is no zero-power CRS.
  • the legacy CRS is transmitted in the subframe not actually configured for the MBSFN.
  • the UE assumes that zero-power CRS does not exist, the UE assumes that data is transmitted to itself without rate-matching data in legacy CRS REs. do.
  • the eNB since the eNB needs to transmit legacy CRS for legacy UEs, the eNB punctures data transmitted from the legacy CRS REs to the NB LTE UE and transmits legacy CRS.
  • the UE assumes that a zero-power CRS exists only in non-MBSFN capable subframes (ie, subframes that cannot be set for MBSFN) and in MBSFN capable subframes (ie, subframes that can be set for MBSFN). Assuming no zero-power CRS may mean that the network punctures the NB-LTE transmission when it has to transmit the legacy CRS. In the case of the PRS, it may be considered to set the PRS transmission subframe as invalid or to set a zero-power PRS for the PRS.
  • the new RS proposed in the present invention can be used not only for transmission of PBCH but also for transmission of other NB-LTE channels.
  • This new RS may have the following structure.
  • the RS patterns proposed below for the new RS below include RS pattern (s) in which the RS patterns illustrated in the following figures have shifted (ie, v-shifted) in the frequency direction.
  • the new RS uses the RE location of DMRS antenna ports 7 or 9 for new RS transmission as shown in FIG. 8 (a). Can be used.
  • both the RE positions from which the existing DMRS antenna port 7 and the antenna port 9 were transmitted are used for transmission of a new RS of a single (single0 antenna port), corresponding to half of the existing DMRS OFDM symbols.
  • a new RS may be transmitted through two OFDM symbols in a subframe, and a new RS may be transmitted through a total of six RE positions where DMRS was previously transmitted in one OFDM symbol. Can be sent.
  • the transmission of the PBCH for NB LTE is transmitted using only one antenna port, for example, as shown in FIG. 8 (c) or FIG. 8 (d), the RE positions of the DMRS antenna ports 7 or 9 are used as they are.
  • RS may be transmitted only in DMRS OFDM symbols corresponding to half of existing DMRS OFDM symbols.
  • the antenna port through which the PBCH and the new RS are transmitted becomes antenna port 0, and may have the same antenna port as the legacy CRS.
  • the antenna port through which the PBCH and the new RS are transmitted may be antenna ports 7 or 9.
  • the antenna port through which the PBCH and the new RS are transmitted may be a new antenna port that was not used previously.
  • antenna ports X and Y When the transmission of the PBCH for NB LTE is transmitted using two antenna ports, assuming that the antenna ports X and Y are transmitted with the new RS, the RE position where the new RS is transmitted is shown in FIG. 9 (a). As described above, antenna ports X and Y may transmit a new RS through the RE positions where DMRS antenna ports 7, 9 are transmitted, respectively.
  • the RE position where a new RS is transmitted for each antenna port may be as shown in FIG. 9 (b).
  • the RE position of the DMRS antenna port 7 or 9 transmits a new RS. This is used for the purpose of RS, but RS can be transmitted only through the RE position of half of the existing RS RE position to reduce the RS RE density.
  • a new RS may be transmitted through two OFDM symbols in a subframe, and a new RS may be transmitted at a total of six RE positions per antenna port in one OFDM symbol.
  • the new RS may be configured as follows in consideration of space frequency block coding (SFBC) transmission and direct current (dc) tone, where 'tone' may correspond to 'subcarrier'.
  • SFBC space frequency block coding
  • dc direct current
  • a UE receiving data over one RB region i.e., 180 kHz bandwidth
  • Subcarriers No. 6 or 6 can be used as dc tones, due to the physical characteristics of dc tones, the receiver does not detect signals on dc tones and affects them as noise.
  • the noise value is reduced, which helps to improve the performance, so it is desirable that no new RS is transmitted on the subcarriers used for these dc tones.
  • data / PBCH two REs to which one SFBC pair for transmitting data or PBCH (hereinafter, referred to as data / PBCH) are mapped are configured as the most continuous subcarriers.
  • the present invention proposes that a new RS is located at the following RE position.
  • a new RS may be transmitted at the RE location as shown in FIG. 10 (a) or 10 (b).
  • a new RS may be transmitted at the RE location as shown in FIG. 11 or 12.
  • the RE location where one SFBC pair is transmitted may be configured as a continuous subcarrier, and thus it is easy to transmit data / PBCH using the SFBC scheme.
  • RSs of two antenna ports may be code division multiplexed and transmitted through the same RE location.
  • an RS density is increased, thereby improving channel estimation performance.
  • the RE positions according to the RS patterns shown in FIGS. 10 and 11 may be expressed as shown in Table 11 below.
  • the RE position according to the RS patterns illustrated in FIG. 12 may be represented as shown in Table 12.
  • R represents a new RS and a new RS may be mapped to an RE indicated by "R”.
  • rows represent remaining subcarriers other than subcarriers used as dc tones, and row indexes 0 through 10 represent subcarrier indexes k 'sequentially assigned to the remaining subcarriers.
  • Subcarrier index k ' is given except subcarriers used as dc tones, so subcarrier index k ' ⁇ in Tables 11 and 12 ⁇ 0,1,2,3,4,5,6,7,8,9,10 ⁇ May be different from the subcarrier index k ⁇ ⁇ 0,1,2,3,4,5,6,7,8,9,10,11 ⁇ assigned to 12 subcarriers in one PRB.
  • columns represent OFDM symbols in a subframe
  • column indexes 0 to 13 represent OFDM symbol indexes l ⁇ ⁇ 0,1,2,3,4,5,6,7, 8,9,10,11,12,13 ⁇ .
  • FIG. 13 and 14 illustrate RS structures according to another embodiment of the present invention.
  • the new RS may be configured as follows in consideration of SFBC transmission. In particular, in order to improve the channel estimation performance, increasing the RS density of the new RS compared to the existing CRS or DMRS can be considered together. In addition, it is preferable that two REs in which one pair of SFBCs are transmitted in order to transmit data / PBCH through SFBC are configured with the most continuous subcarriers. Considering these points, it is suggested that a new RS be located at the following RE position.
  • the proposed contents of the present invention include an RS pattern in which the proposed RS pattern is v-shifted.
  • the transmission of the PBCH for NB LTE is transmitted using only one antenna port, d.c.
  • the RE position as shown in FIG. 13 (a), 13 (b), 13 (c) or 13 (d) may be used for new RS transmission.
  • the transmission of the PBCH for NB LTE is transmitted using only one antenna port, d.c.
  • the RE position as shown in FIG. 14 (a), 14 (b), 14 (c) or 14 (d) may be used for new RS transmission.
  • the RE location where one SFBC pair is transmitted may be configured as a continuous subcarrier, and thus it is easy to transmit data / PBCH using the SFBC scheme.
  • RSs of two antenna ports may be CDMed and transmitted through the same RE location.
  • an RS density per antenna port is increased, thereby improving channel estimation performance.
  • Different values of the v-shift may be applied to the new RS according to the physical cell ID or the virtual cell ID.
  • This v-shift value may be equal to the value of the v-shift (ie, v shift ) applied to the legacy CRS.
  • the v-shift value applied to the new RS may be equal to ' n cell ID mod 6'.
  • n cell ID means (physical or virtual) cell ID.
  • the value of the v-shift applied to the new RS may be different from the value of the v-shift applied to the legacy CRS.
  • the v-shift value applied to the new RS may be equal to ' n cell ID mod 3'.
  • the v-shift value applied to the new RS to transmit a new RS to a subcarrier position different from the legacy CRS may be equal to ' n cell ID mode 3 + ⁇ '.
  • the v-shift value applied to the new RS may be equal to the v-shift value applied to the legacy CRS plus a value of ⁇ . That is, the v-shift value applied to the new RS may be equal to ' n cell ID mod 6 + ⁇ '.
  • 15 to 17 illustrate RS structures according to another embodiment of the present invention.
  • a dense RS may be located for two or four OFDM symbols per antenna port as shown in FIG. 15 or 16. .
  • the entire REs for two OFDM symbols may be used for transmission of an RS for one antenna port.
  • RS may be located as shown in FIG. Since RS overhead can be unnecessarily high, REs located in two OFDM symbols, such as in FIG. 15 (c) or FIG.
  • the RS pattern which cuts the RS density in half by placing the RS only at the RE position, can be used for transmission of a new RS.
  • a new RS may be located in the PB pair in the same pattern as in FIG. 16 (b), 16 (c), or 16 (d).
  • One subcarrier of one subcarrier in one PRB is d.c.
  • the RS pattern as shown in FIG. 15 or FIG. 16 may be modified to the RS pattern as shown in FIG. 17.
  • An RS pattern as shown in FIG. 15 or 16 is used for the new RS, with one subcarrier (eg, subcarrier # 5 or # 6) as shown in FIG. 17 (a) being d.c. Used as a tone and may be excluded from the RS transmit RE.
  • an RS pattern as shown in FIG. 15 or FIG. 16 is used for the new RS, and as shown in FIG. 17 (b), two middle subcarriers may be excluded from the RS transmission RE.
  • an RS pattern as shown in FIG. 15 or 16 may be used for the new RS, but subcarriers # 5 and # 11 may be excluded from the RS transmission RE as shown in FIG. 17 (c).
  • the contents of the present invention include a pattern transmitted through another OFDM symbol position in addition to the proposed OFDM symbol position.
  • a conventional sequence of DMRS or CRS is generated based on N max, DL RB which is the maximum number of PRBs that an LTE system can have, as shown in Equations 3 and 6 below. Therefore, the same RS sequence is generated for the PRB region spaced by the same offset from the center frequency regardless of the cell bandwidth.
  • the following method may be considered in the sequence generation method of a new RS used in NB-LTE.
  • Different sequence generation methods may be used between the standalone NB-LTE and the in-band NB-LTE.
  • different sequence generation schemes may be used according to channels through which UE performs decoding based on a new RS.
  • a different sequence generation scheme may be used for each subframe position where the UE receives a new RS.
  • a sequence configuration of a new RS may vary according to a position of a PRB region in which an NB-LTE UE operates in a cell in which an NB-LTE region exists.
  • the sequence configuration of the new RS may vary according to the offset of the PRB region in which the NB-LTE region exists in the cell from the center frequency region of the cell in which the NB-LTE region exists.
  • Method B A sequence generation of a new RS may be generated based on one PRB, which is a bandwidth of NB-LTE operation. That is, in generating a new sequence of RS of NB-LTE, N max, DL RB may be equal to one. For example, if the RE position of the existing DMRS is applied to the new RS as it is, the RS sequence may be defined as follows.
  • M is the total number of REs of the new RS in the subframe
  • c ( i ) is a pseudo-random sequence.
  • the new RS is assigned to the cell ID of the LB-LTE cell. Can be generated to depend on. For example, the random- pseudo sequence c ( i ) may be generated differently according to the cell ID.
  • a plurality of NB-LTE regions may exist in the same cell. Although each NB-LTE region exists on the same cell, the plurality of NB-LTE regions may have separate cell IDs that are independent of each other.
  • the cell ID used to generate the pseudo-random sequence c ( i ) is the cell ID assigned to each NB-LTE region, not the cell ID of the (LTE) cell in which the in-band NB-LTE region exists. Can be.
  • a new RS sequence may be generated using method A, and in the case of standalone NB-LTE, a new RS sequence may be generated.
  • a new RS sequence using the method B may be transmitted in the subframe region in which the PBCH is transmitted, and a new RS sequence using the method A may be transmitted in the subframe region in which the remaining channels are transmitted.
  • a new RS sequence using the method B may be transmitted in the subframe region in which the PBCH and the SIB are transmitted, and a new RS sequence using the method A may be transmitted in the subframe region in which the remaining control / data channels are transmitted.
  • PBCH In the case of PBCH, it is preferable to transmit all possible resources, and it is preferable to transmit continuously in at least two subframes. Since it is preferable that the resources available for two subframes match, it is preferable that PBCH is transmitted in subframes # 9 and # 0. For in-band NB IoT, it may be considered that several narrowbands support NB-LTE UEs. In this case, by varying the timing of the PBCH transmitted to each NB, it is possible to change the number of repetitions of the PBCH that can be read by each UE for each coverage enhancement level at a predetermined time.
  • the complexity of blind decoding may be increased.
  • PBCH can be shared while maintaining independent NB-LTE cells for each NB.
  • PBCH only one PBCH is transmitted on a cell, and UEs operating on different NBs of the cell, for example, independent NB-LTE cells, may receive the same PBCH.
  • NBs for example, independent NB-LTE cells
  • the multiple NBs may be independently supported by multiple MIBs / SIBs to allow multiple UEs to be supported.
  • common data may be transmitted to one or several NBs.
  • the PBCH may be rate-matched in the RE resource in which the RS is transmitted.
  • the RS may be present according to any of the RS structures proposed in section A.
  • the amount of RE resources to which a new RS is transmitted per OFDM symbol may be smaller than that of the existing DMRS.
  • the neighboring RE resources eg, the previous RE resources or the next RE resources in the same OFDM
  • the new RS can be boosted twice as much power using that power.
  • the PBCH may be rate-matched in the corresponding zero-power RE resource and transmitted.
  • the new RS can transmit up to two (or four, eight) antenna ports, but in reality the new RS uses fewer antenna ports than the maximum number of antenna ports. Can be sent.
  • the number of antenna ports through which a new RS is transmitted may vary, and the total number of REs through which a new RS is transmitted and the RE location may vary.
  • RE mapping of the PBCH may be performed assuming the maximum number of antenna ports for a new RS. That is, assuming that all supported antenna ports for the new RS are used, the PBCH may be rate-matched without being transmitted in the RE location where the new RS exists. In this case, the UE can decode the PBCH without blind detection without knowing the number of antenna ports of the new RS.
  • RE mapping of the PBCH may be performed assuming the number of actual antenna ports through which a new RS is transmitted. That is, the PBCH may be rate-matched at the RE position where the new RS used in the cell is transmitted. In this case, when the UE does not know the number of antenna ports of the new RS, the UE may need to decode the PBCH through blind detection that attempts to decode the PBCH for each number of antenna ports. However, according to this method, since the PBCH is rate-matched only in the RE (s) to which the RS is actually transmitted, the PBCH can be transmitted without wasting resources.
  • the legacy legacy PBCH was transmitted using a CRS-based transmit diversity scheme. If the number of TX antenna ports is 2, it was transmitted using SFBC.
  • the PBCH is based on a new RS.
  • the present invention proposes to transmit / receive the PBCH through the following scheme.
  • the following transmission scheme may be applied to transmission and reception of (E) PDCCH (hereinafter referred to as NB-PDCCH) and PDSCH (hereinafter referred to as NB-PDSCH) of NB-IoT as well as PBCH.
  • the PBCH may be transmitted using the SFBC technique.
  • the RE mapping of the PBCH may vary according to the number of REs to which a new RS is transmitted and the RE location.
  • FIG. 18 is a diagram for describing a concept of space frequency block coding (SFBC).
  • SFBC space frequency block coding
  • symbols S (i) and S (i + 1) are transmitted in the same OFDM symbol as shown in FIG.
  • S (i) is transmitted through antenna port y and antenna port y + b at subcarrier x and subcarrier x + a, respectively
  • S (i + 1) is the antenna port y + b at subcarrier x and subcarrier x + a, respectively. It may be transmitted through antenna port y.
  • S (i) and S (i + 1) are referred to as one SFBC pair.
  • a subcarrier eg, subcarrier x and subcarrier x + a
  • a channel change between the subcarrier x and the subcarrier x + a may increase, thereby reducing the performance of the SFBC.
  • the present invention proposes that the PBCH transmission operates as follows.
  • Alt 1 Transmission of the PBCH on subcarrier x is rate-matched.
  • NB-PDCCH is not transmitted in the rate-matched RE position.
  • the SFBC pair may start transmission on the first subcarrier among subcarriers capable of transmitting NB-PDCCH after subcarrier x + a or subcarrier x + a.
  • the SFBC may start transmission through the first subcarrier among the subcarriers capable of transmitting the NB-PDCCH after the subcarrier x + a + 1 or after the subcarrier x + a + 1.
  • NB-PDCCH is transmitted on subcarrier x, and transmission of the corresponding SFBC pair is dropped on subcarrier x + a. In this case, transmission of the next SFBC pair may be started on the subcarrier x + a.
  • PBCH transmission operates as follows.
  • Alt 1 Transmission of the PBCH on subcarrier x is rate-matched.
  • the corresponding SFBC pair may be transmitted through the next OFDM symbol if the next OFDM symbol exists.
  • PBCH is transmitted on subcarrier x, and the remaining transmissions of the SFBC pair are dropped. At this time, if the next OFDM symbol is present, transmission of the next SFBC pair may be started in the next OFDM symbol.
  • the transmission of the PBCH in the first RE of the RE resource where the PBCH is transmitted is rate-matched.
  • the PBCH may be transmitted from the second available RE resource in the corresponding OFDM symbol.
  • Random precoding (or patterned precoding)
  • an arbitrary precoding matrix may be applied to the PBCH and transmitted.
  • the same precoding matrix may be applied to the PBCH in the same PRB region of the same subframe.
  • a new RS may also be transmitted by applying the same precoding matrix as that of the PBCH.
  • the PBCH may be previously known to the UE or other parameters (eg, subframe index, radio frame index, cell ID, and / or in-band NB LTE).
  • a precoding matrix that can be inferred by the PRB position for NB-IoT in a cell may be applied.
  • the new RS may be transmitted without 1) applying the precoding matrix, or 2) applying the same precoding matrix as that of the PBCH.
  • the same precoding matrix may be applied within the same PRB region of multiple subframes (eg, M subframes) for cross-subframe channel estimation.
  • the precoding matrix applied to a specific subframe may be determined through all or part of the following elements as follows.
  • a precoding matrix applied in a specific subframe may be determined according to a subframe index, a slot index, a system frame number (SFN), a subframe bundle index, and the like.
  • the subframe bundle index is an index for identifying a bundle of the M subframes when the precoding matrix applied to transmission of the PBCH, NB-PDCCH, and / or NB-PDSCH is changed every M subframes. Means.
  • the precoding matrix may be determined by the physical cell ID or the virtual cell ID set by the eNB.
  • the virtual cell ID may be set through the SIB or the RRC by the eNB. If the setting of the virtual cell ID is not transmitted, the default value for the virtual cell ID may be the same as the physical cell ID.
  • the precoding matrix may be determined by a narrowband index on which PBCH, NB-PDCCH, and / or NB-PDSCH are transmitted, a PRB location within a system bandwidth, and the like.
  • the precoding matrix may be determined by the UE ID.
  • Antenna diversity (antenna switching)
  • the antenna ports used among the antenna ports X and Y may be determined according to the RE position where the PBCH is transmitted as in the transmission of the distributed EPDCCH. For example, PBCHs transmitted on odd-numbered REs in an OFDM symbol may be transmitted using antenna port X, and PBCHs transmitted on even-numbered REs may be transmitted using antenna port Y.
  • a PBCH may be transmitted by applying an arbitrary precoding matrix or a patterned precoding matrix, and the same precoding matrix may be applied in the same PRB region of the same subframe.
  • a new RS may also be transmitted by applying the same precoding matrix as that of the PBCH.
  • the same precoding matrix may be applied in the same PRB region of multiple subframes (eg, M subframes) for cross-subframe channel estimation.
  • Radio resource management may be performed for the NB LTE cell.
  • RRM provides the UE with a mobility experience, allowing UEs and networks to seamlessly manage mobility without significant user intervention, ensuring efficient use of available radio resources, and allowing eNBs to define predefined radios. It is an object of the present invention to provide mechanisms for satisfying radio resource related requirements.
  • the main processes performed by the UE include cell search, measurements, handover and cell reselection.
  • the eNB may provide a measurement configuration applicable to the UE for RRM.
  • an eNB may include a measurement configuration in which a UE includes a measurement object, a reporting configuration, a measurement identity, a quantity configuration, and a measurement gap for RRM.
  • the measurement target is an object to which the UE should perform measurement, for example, a single E-UTRA carrier frequency, inter-RAT (Radio Access Technology) UTRA measurement for intra-frequency and inter-frequency measurement.
  • a single UTRA frequency a collection of GERAN carrier frequencies for inter-RAT GERAN measurements, a collection of cell (s) on a single carrier frequency for inter-RAT CDMA2000 measurements.
  • Intra-frequency measurement means measurement at the downlink carrier frequency (s) of the serving cell (s), and inter-frequency measurement means any downlink carrier frequency of the downlink carrier frequency (s) of the serving cell (s). Means measurement at different frequency (s).
  • the reporting setup is a list of reporting setups, each reporting setup indicating a reporting criterion indicating a criterion that triggers the UE to send a measurement report and the quantities that the UE should measure in the measurement report and It is set to a reporting format indicating related information.
  • the measurement identifier is a list of measurement identifiers, and each measurement identifier links one measurement object and one report setting. By setting a plurality of measurement identifiers, it is possible not only to link one or more reporting settings to the same measurement object, but also to link one or more measurement objects to the same report setting.
  • the measurement identifier is used as a reference number in the measurement report.
  • the quantity setting defines the measurement quantities and associated filtering, which are used for all event evaluations and related reporting of that measurement type.
  • One filter can be set for each measurement amount.
  • the measurement gap indicates the period in which no UL / DL transmissions are scheduled so that the UE can use to perform the measurement.
  • the UE Upon receiving the measurement setup, the UE performs a reference signal received power (RSRP) measurement and a reference signal received quality (RSRQ) measurement using a CRS on a carrier frequency indicated as a measurement target. .
  • RSRP measurements provide a cell-specific signal strength metric. RSRP measurements are primarily used to rank candidate cells (or candidate CCs) according to signal strength, or as input for handover and cell reselection determination.
  • RSRP is defined for a particular cell (or a particular CC) as a linear average of the power contribution of the REs carrying the CRS within the considered frequency bandwidth.
  • RSRQ is intended to provide a cell-specific signal quality metric, and is used mainly for ranking candidate cells (or candidate CCs) according to signal quality, similar to RSRP.
  • RSRQ can be used as an input for handover and cell reselection, for example, when RSRP measurements do not provide enough information to make reliable mobility decisions.
  • RSRQ is defined as " N * RSRP / RSSI", where N is the number of RBs of the RSSI measurement bandwidth.
  • the received signal strength indicator is the total received wideband power, adjacent channel observed by the UE from all sources, including co-channel serving and non-serving cells, within the measurement bandwidth. It is defined as all kinds of power including interference channel interference, thermal noise and the like. Therefore, it can be said that RSRQ represents a ratio of pure RS power to total power received by the UE.
  • the UE may perform RRM measurement using a new RS. Due to the application of arbitrary precoding or patterned coding, the RS transmitted as a new RS may vary depending on the subframe. In the case of performing RRM measurement using a new RS transmitted periodically in a plurality of subframes, if the precoding matrices applied to the new RS used for the RRM measurement are different from each other, there may be a problem in that the UE performs the measurement properly. . In particular, when performing neighbor-cell measurement, this may be a problem because the UE does not know the precoding matrix applied to each subframe.
  • RRM radio resource management
  • the present invention proposes that it can be assumed that the same precoding matrix is applied to a new RS for the region where the UE performs RRM measurement.
  • the subframe period in which the same precoding matrix is applied to the new RS is 1) the same as the minimum period that the measurement gap can have, or 2) the number of periods that the measurement gap has or the minimum that the measurement gap can have. It can have a divisor of the period.
  • the UE may assume that the same precoding matrix has been applied in the subframe.
  • the UE may assume that a cell-specific RS is transmitted in the corresponding subframe. And it can be assumed that the UE-specific RS is transmitted in the remaining subframes.
  • a specific / known precoding matrix has been applied to the RS or no precoding has been applied to the RS.
  • the UE-specific precoding matrix may be applied with RS.
  • the transmission of PBCH, NB-PDCCH, and / or NB-PDSCH of NB-IoT operating in in-band environment is transmitted using SFBC technique, and PBCH of NB-IoT operating in stand-alone and / or guard-band environment.
  • the transmission of the NB-PDCCH, and / or NB-PDSCH may be transmitted using any precoding or patterned precoding technique.
  • the antenna port through which the new RS and PBCH, NB-PDCCH, and / or NB-PDSCH are transmitted may be fixed to a specific value.
  • a new RS and an antenna port through which NB-PDCCH or NB-PDSCH is transmitted may be determined by UE ID.
  • the antenna port through which the new RS and the PBCH, NB-PDCCH, and / or NB-PDSCH are transmitted may be antenna port 0.
  • the antenna port through which the new RS and the PBCH, NB-PDCCH, and / or NB-PDSCH are transmitted may be in a quasi co-located (QCL) relationship with antenna port 0.
  • QCL quasi co-located
  • the new RS is cell-specific so that the UE can assume that the new RS is always transmitted (at the promised location) in the narrow band in which it operates.
  • a new RS may be UE-specific, so that the UE may assume that it is transmitted (at the promised location) only during the time domain in which it receives the PBCH, NB-PDCCH, and / or NB-PDSCH.
  • FIG. 19 illustrates methods of applying precoding to a new reference signal according to the present invention.
  • the new RS may be an RS commonly used for reception of all channels as well as the PBCH.
  • the precoding matrix applied to the new RS and data / control channels may be as follows.
  • the precoding matrix applied to the NB-LTE cell may be changed according to a random or predefined pattern in a specific subframe period.
  • the precoding matrix used in each subframe may be inferred by a subframe index, a radio frame index, a cell ID, and / or a PRB position in a cell in the case of in-band NB-IoT LTE.
  • the period and offset at which the precoding matrix is changed can be predefined or set to the UE via MIB, SIB, RRC, or the like.
  • the precoding matrix is changed in a specific subframe period, and there may be a subframe duration in which the same precoding matrix is applied to each period.
  • a precoding matrix determined for each precoding matrix period is applied for the corresponding subframe duration.
  • Information on a period and an offset in which the precoding matrix is changed and a subframe duration to which the precoding matrix determined for each period is applied may be predefined or set to the UE through MIB, SIB, RRC, or the like.
  • the same precoding matrix determined in the same manner may be applied to the same antenna port.
  • One subframe region may consist of one or a plurality of subframes according to a method of applying a precoding matrix.
  • the precoding matrix determined according to any one of the aforementioned methods may be applied.
  • the precoding matrix determined according to any one of the methods described above is used for cell-specific channel transmission (e.g., PBCH, broadcast data (SIB, paging and / or random access response), (E) PDCCH in common search space). ) Can only be applied.
  • cell-specific channel transmission e.g., PBCH, broadcast data (SIB, paging and / or random access response
  • SIB broadcast data
  • E PDCCH in common search space
  • the precoding matrix determined according to any one of the above methods may be applied only for transmission of UE-specific channel (eg, unicast data, (E) PDCCH in UE-specific search space).
  • UE-specific channel eg, unicast data, (E) PDCCH in UE-specific search space.
  • the precoding matrix applied to the transmission of the cell-specific channel and the precoding matrix applied to the transmission of the UE-specific channel may be separately determined.
  • Each subframe duration may be set.
  • the PBCH through which the NB-IoT is transmitted for the NB-IoT is referred to as NB-PBCH.
  • the legacy PBCH is transmitted once within 10 ms, and the transmission period of the PBCH is 40 ms.
  • the NB-PBCH is transmitted once within 10ms with a period of 640ms, so that in all scenarios (eg in-band NB-IoT, guard-band NB-IoT, standalone NB-IoT) ) Can be satisfied.
  • the total overhead of NB-PBCH transmission is about 25% of the total available resources in downlink. .
  • the size of the payload is reduced (so that the number of repetitions can be reduced) or the detection latency or target minimum coupling loss is minimal. Relaxation in terms of coupling loss (MCL) may be considered.
  • MCL coupling loss
  • multiple NB-IoT carriers or multiple subframes available for NB-IoT operation may be considered. If the delay can be mitigated, the NB-PBCH can be sent somewhat intermittent to reduce the total overhead.
  • Reducing the payload size of the NB-PBCH may increase the payload in SIB1, so reducing the payload size of the NB-PBCH may not solve the overall overhead problem.
  • mitigation of requirements or intermittent NB-PBCH transmission may be further considered.
  • a common NB-PBCH mapping / structure may be used for all scenarios, and other NB-PBCH mapping / structure may be used depending on the scenarios. Whether the same structure is used or needs a different structure may depend on the following aspects:
  • the content of the NB-PDCH in each mode of operation (eg, standalone mode, both in-band mode and guard-band mode),
  • At least SFN or frame number index and scheduling information of SIB1 is needed.
  • the following information may be considered.
  • the following information may be transmitted to SIB1 instead of NB-PBCH.
  • An NB-IoT carrier that transmits SIB1 or other system information (SI) may be indicated in at least NB-PBCH, so that legacy CRS may also be used for SIB1 demodulation.
  • Valid subframe information for transmission of SIB1 or other SIs Unlike the standalone or guard-band scenario, the in-band scenario needs to address MBSFN subframes.
  • a legacy CRS pattern may be employed with an additional RS based on CDM-celled specific RS. Only the CDM cell-specific RS pattern can be considered for the standalone scenario. Since in-band legacy CRS may not be available for NB-PBCH decoding, at least in an in-band scenario another RS pattern may be needed for NB-PBCH decoding.
  • CDM cell-specific RS patterns can be used to provide sufficient RS density for new RS patterns, and the CDM cell-specific RS patterns can be common between in-band NB-PBCH and standalone NB-PBCH. have. For example, the RS pattern of FIG. 11 (a), FIG. 11 (d), or FIG. 14 may be used as the CDM-cell-specific RS pattern.
  • the RS pattern of FIG. 20 may be used as the CDM-cell-specific RS pattern.
  • 20 illustrates a cell-specific RS pattern of NB-IoT for two antenna ports.
  • SSS secondary synchronization signals
  • the operation mode types are three or four, two values are needed that are left for other purposes, such as the frame index of the SSS transmission.
  • the frame index of the SSS transmission can increase the UE blind detection for the SSS and reduce the detection performance. Therefore, if an operation mode is considered, it is more natural to distinguish between in-band scenarios and other scenarios because in-band scenarios and other scenarios may have different NB-PBCH mappings and contents.
  • the UE may need to blindly search for the number of antenna ports.
  • the number of antenna ports may be limited to one or two when blindly searching for antenna ports.
  • legacy PBCH the network is assumed to support up to four antenna ports.
  • NB-IoT mapping the transmission scheme and the number of supported antenna ports need to be clarified.
  • For legacy CRS if the UE can assume that the cell ID of the NB-IoT and the cell ID of the legacy carrier are the same, the location of the legacy CRS can be identified even though the UE cannot decode the CRS.
  • rate-matching if rate-matching is considered, then rate-matching assuming four antenna ports needs to be considered, which may have a high overhead compared to puncturing. Also rate-matching is not feasible in in-band scenarios unless the mode of operation is known before NB-PBCH decoding.
  • the present invention proposes to use a puncturing mechanism for legacy CRS instead of rate-matching.
  • Brute-force puncturing can affect performance.
  • applying a Walsh code between two PBCH transmissions may be considered. For example, if the NB-PBCH is transmitted in subframes of the same index every 10 ms, the legacy CRS pattern is expected to be the same in each NB-PBCH transmission. Then, for example, the Walsh code [1 1] is applied to the NB-PBCH and the NB-IoT RS in the even-numbered radio frame (hereinafter, NB-RS), and the NB-PBCH and NB- in the odd-numbered radio frame. Walsh code [1-1] may be applied to the RS for IoT (hereinafter, NB-RS). When the UE receives the NB-PBCH, it may cancel out the legacy CRS between two consecutive NB-PBCHs shown in FIG. 21.
  • the adjacent channel leakage ratio is larger than the case where the NB-IoT has a subcarrier spacing of 3.75 kHz. Greater interference to GSM cells).
  • the NB-IoT system of the 15 kHz subcarrier based on LTE is located in the neighboring frequency region of the GSM system, the NB-IoT system has a greater interference to the GSM system than when the NB-IoT system has a subcarrier spacing of 3.75 kHz. .
  • a method for reducing interference to a cell eg, GSM cell located in an adjacent frequency domain is proposed.
  • the present invention proposes a technique for reducing interference effects on a GSM system located in an adjacent frequency domain, but the present invention relates to a cell in which an NB-IoT cell uses another system other than GSM in an adjacent frequency region (eg, LTE).
  • Cell, NB-IoT cell may be applied to reduce the interference effect of the NB-IoT cell on the cells of the other system.
  • 22 to 24 illustrate the signal transmission / reception example on the IoT cell according to another embodiment of the present invention.
  • the NB-IoT cell or the LTE cell use the following method.
  • the present invention proposes a transmission scheme in an NB-IoT cell for convenience of description, but the contents of the present invention can be applied to an LTE cell.
  • the subcarrier (s) belonging to the corresponding subcarrier region may be a null subcarrier, that is, a zero-power subcarrier, which is not used for transmitting any signal / channel. Whether to use the corresponding subcarrier region may be set by the SIB or RRC signal.
  • One subcarrier or multiple subcarriers may not be used for NB-IoT transmission for one edge portion of the NB-IoT cell as shown in FIG. 22 (b).
  • the subcarrier (s) belonging to the subcarrier region may be a null subcarrier, that is, a zero-power subcarrier, which is not used for transmission of any signal / channel. Whether one edge subcarrier region is used and / or location information of an unused subcarrier may be set by an SIB or RRC signal.
  • Method 3 As shown in Fig. 22 (c), it can be assumed that the transmit power of a signal drops by ⁇ dB for one subcarrier or multiple subcarriers, respectively, for both edge portions of an NB-IoT cell. It can be assumed that the transmission power in one subcarrier or multiple subcarriers, respectively, for both edge portions of the NB-IoT cell is dropped by ⁇ dB compared to the following power.
  • whether or not power reduction in the corresponding subcarrier region and / or the amount of power reduction (eg, a value of ⁇ ) may be set by the SIB or RRC signal.
  • Method 4 As shown in FIG. 22 (d), it may be assumed that a transmission power of a signal drops by ⁇ dB in one subcarrier or a plurality of subcarriers for one edge portion of an NB-IoT cell. In this case, it may be assumed that transmission power in one subcarrier (or multiple subcarriers) region of each edge portion of the NB-IoT cell is dropped by ⁇ dB compared to the following power.
  • whether or not the power reduction in the corresponding subcarrier region and / or the power reduction (eg, a value of ⁇ ) may be set by the SIB or RRC signal.
  • DMRS as shown in FIG. 23 may be used for reception of PBCH, PDSCH, PDCCH, etc. instead of CRS.
  • the subcarrier (s) at one or both edges are not used for IoT communication to reduce the impact of interference on the GSM cell, as suggested in section I, some DMRS RE regions may not be used for the transmission of DMRS. do. Therefore, the present invention proposes a DMRS pattern that can be used in such a case.
  • the UE may assume the following modified DMRS pattern.
  • Method 1 If the first subcarrier is not used, the UE may assume that the DMRS pattern shown in FIG. 24 (a) is applied. In addition, when the last subcarrier is not used, the UE may assume that the DMRS pattern as shown in FIG. 24 (b) is applied. Alternatively, if the subcarriers at both edges are not used, the UE may assume that the same DMRS pattern is applied to FIG. 4 (c). In this case, when all subcarrier regions are used for signal transmission, the RE position of the legacy DMRS may be used as it is.
  • Method 2 Given DMRS configuration by SIB or RRC signal, the UE may assume that the modified DMRS pattern is applied.
  • the modified DMRS pattern may be the same as in FIG. 24A, 24B, or 24C. If the DMRS configuration is not given by the SIB or RRC signal, the UE may assume that the RE position of the legacy DMRS is used as it is.
  • the DMRS pattern used through the SIB or RRC signal may be set.
  • An example of a DMRS pattern that may be used may be the pattern in FIG. 24 (a), FIG. 24 (b), or FIG. 24 (c). If the DMRS configuration is not given by the SIB or RRC signal, the UE may assume that the RE position of the legacy DMRS is used as it is.
  • the DMRS pattern as shown in FIG. 24 (c) can always be applied to NB-IoT transmission. That is, the DMRS pattern as shown in FIG. 24C may be used in the NB-IoT cell.
  • the UE may determine the DMRS pattern applied to the cell through reception of the PSS / SSS. For example, the UE may determine a DMRS pattern applied to a corresponding cell through a PSS / SSS sequence and / or an OFDM symbol position.
  • the UE may assume the following modified DMRS pattern.
  • Method 1 If the first subcarrier is not used, the UE may assume that the DMRS pattern shown in FIG. 24 (d) is applied. In addition, when the last subcarrier is not used, the UE may assume that the DMRS pattern as shown in FIG. 24 (e) is applied. Alternatively, if the subcarriers at both edges are not used, the UE may assume that the same DMRS pattern is applied to FIG. 24 (f). If all subcarrier regions are used for signal transmission, the RE position of the legacy DMRS may be used as it is.
  • Method 2 Given DMRS configuration by SIB or RRC signal, the UE may assume that the modified DMRS pattern is applied.
  • the modified DMRS pattern may be the same as in FIG. 24 (d), FIG. 24 (e), or FIG. 24 (f). If the DMRS configuration is not given by the SIB or RRC signal, the UE may assume that the RE position of the legacy DMRS is used as it is.
  • the DMRS pattern used may be set via an SIB or RRC signal.
  • an example of the DMRS pattern that can be used may be the pattern of FIG. 24 (d), FIG. 24 (e) or FIG. 24 (f). If the DMRS configuration is not given by the SIB or RRC signal, the UE may assume that the RE position of the legacy DMRS is used as it is.
  • the DMRS pattern as shown in FIG. 24 (f) can always be applied. That is, the DMRS pattern as shown in FIG. 24 (f) may be used in the NB-IoT cell.
  • the UE may determine the DMRS pattern applied to the cell through reception of the PSS / SSS. For example, the UE may determine a DMRS pattern applied to a corresponding cell through a PSS / SSS sequence and / or an OFDM symbol position.
  • the amount of RE resources available for actual data transmission is reduced.
  • the existing TB size determination method is used as it is, the determined TB size may become larger than the amount of resources that can actually transmit data, and thus data may not be properly transmitted.
  • the present invention proposes methods for preventing the effective code rate of data transmission from increasing too much.
  • TBS the final TB size determined as in the conventional method
  • TBS ' the final TB size, TBS '
  • TBS * alpha the final TB size
  • 'alpha' may be a value smaller than 1.
  • Method 2 When the maximum TB size that can be transmitted in the NB-IoT system exists, the smaller of the TB size determined as in the conventional method and the maximum TB size that can be transmitted in the NB-IoT system can be determined as the final TB size. Can be. If the maximum TB size that can be transmitted in the NB-IoT system is called max_TBS, and the TB size determined as in the conventional method is TBS, the final TB size TBS 'may be equal to min (max_TBS, TBS).
  • Method 3 After TB size is determined based on one TTI (e.g., one subframe), the TB maps to resources of multiple TTIs (e.g., two subframes) in order to increase the effective code rate. Can be sent.
  • one TTI e.g., one subframe
  • the TB maps to resources of multiple TTIs (e.g., two subframes) in order to increase the effective code rate. Can be sent.
  • the proposed method (s) for solving the problem of increasing the effective code rate may be applied by the following viewpoints / methods.
  • Option 1 In NB-IoT, a method for solving the problem of increasing the effective code rate can always be applied.
  • NB-IoT if one or both cell-edge subcarriers are not used for the transmission of the signal, a method for solving the problem of increasing the effective code rate may be applied.
  • 25 is a block diagram showing the components of the transmitter 10 and the receiver 20 for carrying out the present invention.
  • the transmitter 10 and the receiver 20 are radio frequency (RF) units 13 and 23 capable of transmitting or receiving radio signals carrying information and / or data, signals, messages, and the like, and in a wireless communication system.
  • the device is operatively connected to components such as the memory 12 and 22, the RF unit 13 and 23, and the memory 12 and 22, which store various types of information related to communication, and controls the components.
  • a processor (11, 21) configured to control the memory (12, 22) and / or the RF unit (13, 23), respectively, to perform at least one of the embodiments of the invention described above.
  • the memories 12 and 22 may store a program for processing and controlling the processors 11 and 21, and may temporarily store input / output information.
  • the memories 12 and 22 may be utilized as buffers.
  • the processors 11 and 21 typically control the overall operation of the various modules in the transmitter or receiver. In particular, the processors 11 and 21 may perform various control functions for carrying out the present invention.
  • the processors 11 and 21 may also be called controllers, microcontrollers, microprocessors, microcomputers, or the like.
  • the processors 11 and 21 may be implemented by hardware or firmware, software, or a combination thereof.
  • application specific integrated circuits ASICs
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • the firmware or software when implementing the present invention using 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 configured to perform the present invention.
  • the firmware or software may be provided in the processors 11 and 21 or stored in the memory 12 and 22 to be driven by the processors 11 and 21.
  • the processor 11 of the transmission apparatus 10 is predetermined from the processor 11 or a scheduler connected to the processor 11 and has a predetermined encoding and modulation on a signal and / or data to be transmitted to the outside. After performing the transmission to the RF unit 13. For example, the processor 11 converts the data sequence to be transmitted into K layers through demultiplexing, channel encoding, scrambling, and modulation.
  • the coded data string is also called a codeword and is equivalent to a transport block, which is a data block provided by the MAC layer.
  • One transport block (TB) is encoded into one codeword, and each codeword is transmitted to a receiving device in the form of one or more layers.
  • the RF unit 13 may include an oscillator for frequency upconversion.
  • RF unit 13 is N t ( N t May include a positive integer greater than or equal to 1).
  • the signal processing of the receiver 20 is the reverse of the signal processing of the transmitter 10.
  • the RF unit 23 of the receiving device 20 receives a radio signal transmitted by the transmitting device 10.
  • the RF unit 23 may include N r receive antennas, and the RF unit 23 frequency down-converts each of the signals received through the receive antennas to restore the baseband signal. .
  • the RF unit 23 may include an oscillator for frequency downconversion.
  • the processor 21 may decode and demodulate a radio signal received through a reception antenna to restore data originally transmitted by the transmission apparatus 10.
  • the RF units 13, 23 have one or more antennas.
  • the antenna transmits a signal processed by the RF units 13 and 23 to the outside under the control of the processors 11 and 21, or receives a radio signal from the outside to receive the RF unit 13. , 23).
  • Antennas are also called antenna ports.
  • Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna elements.
  • the signal transmitted from each antenna can no longer be decomposed by the receiver 20.
  • a reference signal (RS) transmitted in correspondence with the corresponding antenna defines the antenna as viewed from the perspective of the receiver 20, and whether the channel is a single radio channel from one physical antenna or includes the antenna.
  • RS reference signal
  • the receiver 20 enables channel estimation for the antenna. That is, the antenna is defined such that a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is delivered.
  • the antenna In the case of an RF unit supporting a multi-input multi-output (MIMO) function for transmitting and receiving data using a plurality of antennas, two or more antennas may be connected.
  • MIMO multi-input multi-output
  • the UE operates as the transmitter 10 in the uplink and the receiver 20 in the downlink.
  • the eNB operates as the receiving device 20 in the uplink, and operates as the transmitting device 10 in the downlink.
  • the processor, the RF unit and the memory provided in the UE will be referred to as a UE processor, the UE RF unit and the UE memory, respectively, and the processor, the RF unit and the memory provided in the eNB will be referred to as an eNB processor, the eNB RF unit and the eNB memory, respectively.
  • the eNB processor of the present invention may configure NB-IoT according to any one of the above-described proposed methods of the present invention.
  • the eNB processor may be configured to allocate channel (s) for NB-IoT and / or RS for NB-IoT according to any one of the proposed methods of the present invention.
  • the eNB processor may control the eNB RF unit to transmit channel (s) for NB-IoT and / or RS for NB-IoT on an NB-IoT cell according to any one of the proposed methods of the present invention.
  • the UE processor of the present invention configures the NB-IoT according to any one of the above-described proposed methods of the present invention.
  • the UE processor may be configured to demodulate or decode a received signal assuming that channel (s) for NB-IoT and / or RS for NB-IoT are allocated according to any one of the proposed methods of the present invention. have.
  • the UE processor may control the UE RF unit to receive channel (s) for NB-IoT and / or RS for NB-IoT on an NB-IoT cell according to any one of the proposed methods of the present invention.
  • Embodiments of the present invention may be used in a base station or user equipment or other equipment in a wireless communication system.

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

Abstract

L'invention concerne un procédé et un dispositif d'émission et/ou de réception d'un signal dans un Internet des objets en bande étroite (NB-IoT). Une donnée de liaison descendante et un signal de référence pour le NB-IoT peuvent être émis sur un seul bloc de ressources dans une sous-trame. Le signal de référence peut être émis dans un schéma de signal de référence où le signal de référence est défini de manière à présenter un intervalle identique entre des signaux de référence dans une sous-porteuse restante à l'exclusion d'une sous-porteuse utilisée pour une tonalité à courant continu parmi des sous-porteuses du bloc de ressources en question dans la sous-trame.
PCT/KR2016/009692 2015-09-11 2016-08-31 Procédé de réception d'un signal de liaison descendante et équipement d'utilisateur, et procédé d'émission d'un signal de liaison descendante et station de base WO2017043801A1 (fr)

Applications Claiming Priority (14)

Application Number Priority Date Filing Date Title
US201562217037P 2015-09-11 2015-09-11
US62/217,037 2015-09-11
US201562220276P 2015-09-18 2015-09-18
US62/220,276 2015-09-18
US201562232363P 2015-09-24 2015-09-24
US62/232,363 2015-09-24
US201562234612P 2015-09-29 2015-09-29
US62/234,612 2015-09-29
US201562265405P 2015-12-09 2015-12-09
US62/265,405 2015-12-09
US201662274735P 2016-01-04 2016-01-04
US62/274,735 2016-01-04
US201662277447P 2016-01-11 2016-01-11
US62/277,447 2016-01-11

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WO2019004735A1 (fr) * 2017-06-28 2019-01-03 엘지전자 주식회사 Procédé et appareil d'émission-réception de signal sans fil dans un système de communication sans fil
KR102093421B1 (ko) 2017-07-12 2020-03-25 엘지전자 주식회사 Nrs를 수신하는 방법 및 nb-iot 기기
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WO2019013512A1 (fr) * 2017-07-12 2019-01-17 엘지전자 주식회사 Procédé et dispositif nb-iot pour recevoir des nrs
KR20190067881A (ko) * 2017-07-12 2019-06-17 엘지전자 주식회사 Tdd 스페셜 서브프레임 상에서 하향링크 물리 채널을 수신하는 방법 및 nb-iot 기기
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KR20200032270A (ko) * 2017-07-12 2020-03-25 엘지전자 주식회사 Nrs를 수신하는 방법 및 nb-iot 기기
CN110476389A (zh) * 2017-07-12 2019-11-19 Lg电子株式会社 用于接收nrs的方法及nb-iot设备
KR102421007B1 (ko) 2017-07-12 2022-07-15 엘지전자 주식회사 Nrs를 수신하는 방법 및 nb-iot 기기
US10965510B2 (en) 2017-07-12 2021-03-30 Lg Electronics Inc. Method for receiving NRS and NB-IoT device thereof
WO2019013513A1 (fr) * 2017-07-12 2019-01-17 엘지전자 주식회사 Procédé et dispositif nb-iot pour recevoir un canal physique de liaison descendante sur une sous-trame spéciale tdd
US10939271B2 (en) 2017-07-12 2021-03-02 Lg Electronics Inc. Method and NB-IOT device for receiving downlink physical channel on TDD special subframe
KR102122896B1 (ko) 2017-07-12 2020-06-15 엘지전자 주식회사 Tdd 스페셜 서브프레임 상에서 하향링크 물리 채널을 수신하는 방법 및 nb-iot 기기
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CN111512584A (zh) * 2017-08-11 2020-08-07 苹果公司 未许可窄带物联网控制信道通信
KR102369216B1 (ko) * 2017-08-11 2022-03-02 애플 인크. feNB-IoT들을 지원하는 TDD에서의 다운링크 송신
WO2019032978A1 (fr) * 2017-08-11 2019-02-14 Intel IP Corporation Transmission de liaison descendante en tdd prenant en charge des fenb-ido
CN111512584B (zh) * 2017-08-11 2023-08-04 苹果公司 未许可窄带物联网控制信道通信设备、方法和可读介质
KR20200030122A (ko) * 2017-08-11 2020-03-19 애플 인크. feNB-IoT들을 지원하는 TDD에서의 다운링크 송신
US11825476B2 (en) 2018-04-10 2023-11-21 Qualcomm Incorporated Communication of direct current (DC) tone location
US11160055B2 (en) 2018-04-10 2021-10-26 Qualcomm Incorporated Communication of direct current (DC) tone location
WO2019199814A1 (fr) * 2018-04-10 2019-10-17 Qualcomm Incorporated Signalisation de liaison montante de localisation de tonalité en courant continu (dc) en nouvelle radio (nr)
WO2020032749A1 (fr) * 2018-08-09 2020-02-13 엘지전자 주식회사 Procédé de commande d'un terminal et d'une station de base dans un système de communication sans fil prenant en charge l'internet des objets à bande étroite, et appareil prenant en charge le procédé.

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