WO2016114628A1 - Procédé de régulation de puissance pour la communication de type machine, et appareil à cet effet - Google Patents

Procédé de régulation de puissance pour la communication de type machine, et appareil à cet effet Download PDF

Info

Publication number
WO2016114628A1
WO2016114628A1 PCT/KR2016/000464 KR2016000464W WO2016114628A1 WO 2016114628 A1 WO2016114628 A1 WO 2016114628A1 KR 2016000464 W KR2016000464 W KR 2016000464W WO 2016114628 A1 WO2016114628 A1 WO 2016114628A1
Authority
WO
WIPO (PCT)
Prior art keywords
resource element
type resource
power
transmission
signal
Prior art date
Application number
PCT/KR2016/000464
Other languages
English (en)
Korean (ko)
Inventor
서한별
이윤정
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Publication of WO2016114628A1 publication Critical patent/WO2016114628A1/fr

Links

Images

Classifications

    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a power control method and apparatus for machine type communication (MTC).
  • MTC machine type communication
  • Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • 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
  • MC-FDMA multi-carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • Wi-Fi IEEE 802.11
  • WiMAX IEEE 802.16
  • E-UTRA Evolved UTRA
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A Advanced
  • WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system).
  • MTC Machine type communication
  • a method for controlling downlink transmission power of a base station, a method for receiving a downlink signal from such a terminal, and an apparatus therefor are provided in a wireless communication system supporting a machine type communication (MTC) device.
  • MTC machine type communication
  • a method for controlling a downlink transmission power by a base station includes: a first type resource element and a second type resource included in a subframe using a reference signal and a downlink control channel based on the reference signal; Calculating transmit power for the element; Allocating a first power to the first type resource element; And additionally allocating a second power to the first type resource element.
  • the first power may be a transmission power calculated for the first type resource element
  • the second power may be a power having a value less than or equal to the transmission power calculated for the second type resource element.
  • a method for receiving a downlink signal by a terminal in a wireless communication system supporting a machine type communication (MTC) device includes: receiving a subframe including a first type resource element and a second type resource element Doing; And measuring power at the first type resource element and the second type resource element.
  • the power of the second type resource element is 0, and the transmission power of the first type resource element is calculated for the first type resource element when assuming signal transmission in the second type resource element.
  • the first transmission power may have a sum of the second transmission powers calculated for the second type resource element.
  • a base station in a wireless communication system supporting a machine type communication (MTC) device includes: a transceiver for transmitting and receiving a signal; And a processor.
  • the processor calculates transmit power for a first type resource element and a second type resource element included in a subframe, allocates a first power to the first type resource element, and assigns a second power to the first type resource element.
  • Power may be additionally allocated, wherein the first power is a transmit power calculated for the first type resource element, and the second power is of a value less than or equal to the transmit power calculated for the second type resource element. It may be power.
  • a terminal in a wireless communication system supporting a machine type communication (MTC) device includes: a receiver for receiving a subframe including a first type resource element and a second type resource element; And a processor for measuring power in the first type resource element and the second type resource element.
  • the power of the second type resource element is 0, and the transmission power of the first type resource element is a first transmission calculated for the first type resource element when assuming signal transmission in the second type resource element.
  • the power may have a value obtained by adding the second transmit power calculated for the second type resource element.
  • the first type resource element may be a reference signal resource element (RS RE). More specifically, the RS RE may be at least one of a Cell-Specific Reference Signal (CRS) RE and a Demodulation-Reference Signal (DM-RS) RE.
  • CRS Cell-Specific Reference Signal
  • DM-RS Demodulation-Reference Signal
  • the first type resource element and the second type resource element may be resource elements on the same symbol.
  • the second type resource element may have a different frequency from the first type resource element.
  • the first type resource element and the second type resource element may be located on at least one symbol among reference signal symbols, and the at least one symbol may be a symbol except for a symbol to which a physical downlink control channel (PDCCH) is mapped. Can be.
  • PDCCH physical downlink control channel
  • the base station may calculate the transmit power for the third type resource element in the subframe and allocate the calculated transmit power for the third type resource element.
  • the third type resource element may be a resource element located in a different symbol from the first type resource element.
  • a reference signal may be mapped to the first type resource element, and the reference signal may be transmitted to the terminal.
  • the first type resource element may correspond to a predetermined pattern associated with the reference signal.
  • the predetermined pattern may be a pattern set for some of the plurality of antennas.
  • the wireless communication signal can be efficiently transmitted / received.
  • 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.
  • 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
  • FIG. 4 illustrates a downlink subframe structure used in a wireless communication system.
  • 5 shows a resource unit used to configure a downlink control channel.
  • FIG. 6 shows an example of an uplink (UL) subframe structure used in a wireless communication system.
  • FIG. 8 illustrates an example of transmission of a downlink signal for an MTC according to an embodiment of the present invention.
  • FIG 9 illustrates an example of transmission of a downlink signal for MTC according to another embodiment of the present invention.
  • FIG. 10 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.
  • the UE may be a terminal equipment (MS), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), or a wireless modem. It may be called a modem, a handheld device, or the like.
  • 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 names.
  • 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.
  • RRH or RRU, RRH / RRU is generally connected to the eNB by a dedicated line such as an optical cable
  • RRH / RRU and 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.
  • a cell that provides uplink / downlink communication service to a 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.
  • 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). Since downlink coverage, which is a range in which a node can transmit valid signals, and uplink coverage, which is a range in which a valid signal is received from a UE, depends on a carrier carrying the signal, 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 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 RE is allocated to the PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH.
  • the PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH resource is referred to below:
  • the expression that the user equipment transmits the PUCCH / PUSCH / PRACH is hereinafter referred to as uplink control information / uplink on or through PUSCH / PUCCH / 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.
  • An OFDM symbol / subcarrier / RE to which PSS / SSS is assigned or configured is referred to as a PSS / SSS symbol / subcarrier / 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 positions of REs occupied by the CRS according to CRS ports, and antenna ports configured to transmit UE-RSs may be UE-RS according to UE-RS ports.
  • the RSs may be distinguished from each other by the positions of REs occupied, and antenna ports configured to transmit CSI-RSs may be distinguished from each other by the positions of REs occupied by the CSI-RSs according to the CSI-RS ports. Therefore, the term CRS / UE-RS / CSI-RS / TRS port is also 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 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, one slot includes seven OFDM symbols in the case of a normal CP, but one slot includes six OFDM symbols in the case of an extended CP.
  • FIG. 2 illustrates a subframe in which one slot includes 7 OFDM symbols for convenience of description, embodiments of the present invention can be applied to subframes having other 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 (e.g. 7) consecutive OFDM symbols in the time domain and is defined by N RB sc (e.g. 12) consecutive subcarriers in the frequency domain. Is defined.
  • N DL / UL symb e.g. 7
  • 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 contiguous OFDM symbols (e.g. 7) or SC-FDM symbols in the time domain, and N RB sc (e.g. 12) contiguous in the frequency domain Is defined by subcarriers. Therefore, one PRB is composed of N DL / UL symb ⁇ N RB sc resource elements. And occupy the same sub-carrier of two consecutive N sc RB in one subframe, two RB to one each located on each of the two slots of the subframe is called 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.
  • 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) to synchronize 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) to synchronize 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 is specifically the subframe 0 and the subframe 5. I don't know what it is. 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 which has performed the cell discovery process using the SSS and determined the time and frequency parameters required to perform the demodulation of the DL signal and the transmission of the UL signal at an accurate time point, can also receive the system configuration of the UE from the eNB. System information required for system configuration must be obtained to communicate with the eNB.
  • System information is configured by a Master Information Block (MIB) and System Information Blocks (SIBs).
  • 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. 2 (System Information Block Type 2, SIB2) and SIB3 to SIB8.
  • the MIB contains the most frequently transmitted parameters that are necessary for the UE to have initial access to the eNB's network.
  • 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.
  • 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
  • the PBCH is mapped to four subframes in 40 ms.
  • the 40 ms time is blind detected and there is no explicit signaling for the 40 ms time.
  • the PBCH is transmitted in OFDM symbols 0 to 3 of slot 1 (second slot of subframe 0) in subframe 0 in a radio frame.
  • 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 accessing the eNB's network may obtain more specific system information by receiving the PDSCH according to the PDCCH and the information on the PDCCH. After performing the above-described procedure, the UE may perform PDCCH / PDSCH reception and PUSCH / PUCCH transmission as a general uplink / downlink signal transmission procedure.
  • FIG. 4 illustrates a downlink 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 structure of the REG is described in more detail with reference to FIG. 5.
  • the set of OFDM symbols available for PDCCH in a subframe is given by the following table.
  • Subframe Number of OFDM symbols for PDCCH when N DL RB > 10 Number of OFDM symbols for PDCCH when N DL RB ⁇ 10
  • 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
  • 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.
  • CFI is coded according to the following table.
  • 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
  • PHICH For PUSCH transmission on a sub-frame n, user equipment has to determine the PHICH within the PHICH resource subframe n + k.
  • k PHICH is always 4 for FDD and may be determined according to the following table for time division duplex (TDD).
  • PHICH resources are determined by index pairs ( n group PHICH , n seq PHICH ).
  • n group PHICH represents a PHICH group number
  • n seq PHICH represents an orthogonal sequence index within the group.
  • the n group PHICH and n seq PHICH may be determined according to, for example, the following equation.
  • n DMRS is a value indicating a cyclic shift applied to the DMRS for the corresponding PUSCH.
  • the n DMRS may be obtained from a value set in a cyclic shift field for DMRS, included in the most recent DCI format 0 for a transport block associated with the corresponding PUSCH transmission.
  • DCI format 0 is a DCI format used for scheduling of a PUSCH.
  • n DMRS may be mapped based on a value set in the field in DCI format 0, for example, according to the following table.
  • n DMRS is set to 0 do.
  • N PHICH SF represents the size of the spreading factor used for PHICH modulation.
  • I PRB_RA indicates that the number of TBs recognized for the first transport block (TB) of a PUSCH with an associated PDCCH or negatively differs from the number of TBs indicated in the most recent PDCCH associated with that PUSCH.
  • I lowest_index is PRB_RA
  • I lowest_index PRB_RA is +1.
  • I lowest_index PRB_RA represents the lowest PRB index in the first slot of the corresponding PUSCH transmission.
  • N group PHICH indicates the number of PHICH groups set by a higher layer. The number of PHICH groups N group PHICH may be determined as follows.
  • N g is a value selected by one of four values of ⁇ 1/6, 1/2, 1, 2 ⁇ and signaled by an upper layer.
  • the system bandwidth is 25 and RB, when using a normal CP is ⁇ 1/6, 1/2, 1, 2 ⁇ for the N g N PHICH group is ⁇ 1, 2, 4, 7 ⁇ , is do.
  • PHICH group index n group PHICH ranges from 0 to N group PHICH -1.
  • N group PHICH is given by Equation 2
  • m i is given by the following table with the UL-DL configuration provided by a higher-layer parameter called subframeAssignment .
  • the PHICH group index n group PHICH ranges from 0 to m i N group PHICH -1.
  • 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
  • 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 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.
  • 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 subframe attempts to decode the PDCCH until all PDCCHs of the corresponding DCI format have detected a PDCCH having their own identifiers. 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.
  • the amount of PDCCH to be transmitted by the eNB is gradually increased.
  • 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. For this reason, establishing a new control channel in the data region (hereinafter referred to as PDSCH region) rather than the existing control region (hereinafter referred to as PDCCH region) has been discussed.
  • 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.
  • the EPDCCH may be transmitted based on a demodulated RS (hereinafter, referred to as DMRS).
  • DMRS demodulated RS
  • 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 in FIG. 6 may be occupied by DMRS (s) at antenna ports 107 or 108 on a PRB to which EPDCCH is mapped, and FIG. 6.
  • REs occupied by UE-RS (s) of antenna ports 9 or 10 in may be occupied by DMRS (s) of antenna ports 109 or 110 on the 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 EPDCCH is transmitted using an aggregation of one or more 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.
  • R0 to R3 represent CRSs for antenna ports 0 to 3. According to the number of antenna ports of the transmitting node, C0 of R0, R0 and R1, or R0 to R3 is transmitted.
  • 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 CRS is transmitted over the entire downlink bandwidth in all downlink subframes in a cell supporting PDSCH transmission and configured in the eNB. All antenna ports were sent.
  • CRS sequence r l, ns ( m ) is defined according to the following equation.
  • n s is a slot number in a radio frame and l is an OFDM symbol number in the slot.
  • N max DL RB is the largest downlink bandwidth setting and is expressed as an integer multiple of N RB sc .
  • the pseudo-random sequence c ( i ) may be defined by a length-31 Gold sequence.
  • the initialization of the second m -sequence is represented by the following equation with a value that depends on the application of the sequence.
  • Equation 3 the pseudo-random sequence generator is initialized by the following equation at the start of each OFDM symbol.
  • N cell ID represents a physical cell identifier (or also called a physical layer cell identifier) that the UE can acquire based on the PSS / SSS
  • N CP is a value defined as 1 for a normal CP and 0 for an extended CP. to be.
  • the CRS sequence r l, ns ( m ) is mapped to complex-valued modulation symbols a (p) k, l used as reference symbols for antenna port p in slot n s according to the following equation.
  • n s is a slot number in a radio frame
  • l is an OFDM symbol number in the slot, and is determined according to the following equation.
  • N max, DL RB is the largest downlink bandwidth configuration and is expressed as an integer multiple of N RB sc .
  • N DL RB is a downlink bandwidth setting, expressed as an integer multiple of N RB sc .
  • the UE can know the N DL RB which is the downlink system bandwidth from the MIB carried by the PBCH.
  • Equation 8 downlink variables v and v shift define positions in frequency for other reference signals, and v is given by the following equation.
  • the cell-specific frequency shift v shift is given by the following equation according to the physical layer cell identity N cell ID as follows.
  • REs ( k , l ) used for transmission of CRSs on any one of the antenna ports in the slot are not used for CRS transmission on any other antenna port in the same slot and are set to zero. That is, in the RE used for CRS transmission of another antenna port in the same slot, transmit power is set to 0 in the corresponding antenna port.
  • the UE may measure CSI using CRS, and may demodulate a signal received through PDCCH and / or PDSCH in a subframe including the CRS. That is, the eNB transmits the CRS at a predetermined position in each RB in all RBs, and the UE detects the PDCCH and / or PDSCH after performing channel estimation based on the CRS. For example, the UE measures a signal received at a CRS RE, and the PDCCH / PDSCH is mapped using a ratio of the measured signal and a reception energy for each RE to which the PDCCH / PDSCH of the reception energy for each CRS RE is mapped.
  • the PDCCH / PDSCH signal can be detected from the RE.
  • the base station may determine the downlink transmission power per RE.
  • the UE assumes that a specific CRS Energy Per Resource Element (EPRE) is constant in downlink system bandwidth and all subframes until other cell specific RS signal information is received.
  • the CRS EPRE may be derived from the downlink reference signal transmission power given by the parameter provided by the upper layer, referenceSignalPower .
  • the downlink reference signal transmission power may be defined as a linear average of power contributions of all REs transmitting the CRS within the system frequency.
  • the power of the RE transmitting the PDSCH from the CRS EPRE can be determined.
  • the terminal Parameters related to transmit power, received by higher layer signaling Wow It can be seen from.
  • Wow In the relationship corresponding to the following equation (11), and thus the terminal receives the signal from Can be obtained.
  • power-offset 0 in all PDSCH transmission schemes except for multi-user MIMO.
  • the UE is delivered to the UE through higher layer signaling as a UE specific parameter.
  • the value may be any one of the values corresponding to Table 9 below.
  • 5 shows a resource unit used to configure a downlink control channel.
  • FIG. 5A illustrates a case where the number of transmit antenna ports is one or two
  • FIG. 5B illustrates a case where the number of transmit antenna ports is four.
  • the resource unit for the control channel is REG.
  • the REG consists of four neighboring REs except the CRS. That is, the REG is composed of the remaining REs except for the RE indicated by any one of R0 to R3 in FIG. 5.
  • PFICH and PHICH include four REGs and three REGs, respectively.
  • the PDCCH is composed of CCE units, and one CCE includes 9 REGs.
  • FIG. 5 illustrates that the REGs constituting the CCE are adjacent to each other, nine REGs constituting the CCE may be distributed on a frequency and / or time axis in the control region.
  • Blocks of bits b (i) (0), ..., b (i) ( M (i) bit- 1) on each control channel to be transmitted in the subframe are multiplexed, so that blocks b (0) (0 ) of bits ), ..., b (0) ( M (0) bit- 1), b (1) (0), ..., b (1) ( M (1) bit- 1), ..., b (nPDCCH-1) (0), ..., b (nPDCCH-1) ( M (nPDCCH-1) bit -1) .
  • M (i) bit is the number of bits in one subframe to be transmitted on the PDCCH channel number i
  • nPDCCH is the number of PDCCHs transmitted in the subframe.
  • the scrambling sequence c ( i ) is given by equation (4).
  • the scrambling sequence generator is initialized in the following manner at the beginning of each subframe.
  • CCE number n corresponds to bits b (72 n ), b (72 n +1), ..., b (72 n +71).
  • Block of scrambled bits Is modulated by QPSK resulting in blocks d (0), ..., d ( M sym -1) of complex-valued modulation symbols.
  • Blocks of modulation symbols d (0), ..., d ( M symb -1) are precoded for single-layer port and defined for transmission on a single antenna port according to the layer mapping defined for transmission on a single antenna port.
  • y (p) ( i ) represents a signal for antenna port p .
  • the mapping of REs is defined by the operations on quadruplets of complex-valued symbols.
  • z (p) ( i ) ⁇ y (p) (4 i ), y (p) (4 i +1), y (p) (4 i +2), y (p) (4 i +3)
  • the blocks z (p) (0), ..., z (p) ( M quad -1) (where M quad M symb / 4) of quadruplets are permuted to allow w (p) (0), ..., w (p) ( M quad -1)
  • Blocks of quadruplets w (p) (0), ..., w (p) ( M quad -1) are cyclically shifted, Becomes .
  • the block of quadruplets The mapping of is defined in terms of REGs according to steps 1-10 below.
  • Step 4) If the resource element ( k ', l ') represents a REG, and the REG is not assigned to the PCFICH or PHICH, perform steps 5 and 6, otherwise go to step 7.
  • Step 5 Symbol Quadruplet Is mapped to the REG represented by ( k ', l ') for each antenna port p .
  • Step 6) Increase m 'by 1.
  • Step 7) Increase l 'by 1.
  • Step 8) If l ' ⁇ L (where L corresponds to the number of OFDM used for PDCCH transmission as indicated by the sequence transmitted on the PCFICH), repeat from step 4.
  • Step 9) increase k 'by 1.
  • Step 10 If k ' ⁇ N DL RB ⁇ N RB sc, repeat from step 3.
  • 3GPP LTE TS 36.211 and 3GPP LTE TS 36.212 documents for more details on the layer mapping, precoding, permutation, etc. of the PDCCH.
  • FIG. 6 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
  • the CSI may be composed of channel quality information (CQI), precoding matrix indicator (PMI), precoding type indicator, and / or rank indication (RI).
  • CQI channel quality information
  • PMI precoding matrix indicator
  • RI rank indication
  • MIMO Multiple Input Multiple Output
  • 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.
  • next generation system (beyond LTE (-A) system) of 3GPP LTE (-A) system
  • low-cost / low-spec devices are mainly used for data communication such as meter reading, water level measurement, surveillance camera use, and inventory reporting of vending machines.
  • MTC device In case of MTC UE, since the amount of transmitted data is small and the number of UEs operating in one cell is large, the burden on the eNB becomes very large when signal transmission for uplink / downlink scheduling / feedback is performed for each UE at once. .
  • uplink data / feedback transmission by the MTC UE is not continuous and intermittent, the eNB may not continuously maintain uplink time / frequency synchronization of the MTC UE. Therefore, in order to save power of the MTC UE, uplink data / feedback transmission of the MTC UE is preferably performed in a random access preamble based RACH procedure.
  • a situation in which a plurality of MTC UEs performing the same / similar functions in a limited space such as a specific building, a building, a warehouse, etc. may be arranged / operated for the purpose of measurement / detection / reporting / maintenance.
  • a plurality of MTC UEs performing the same / similar functions in a limited space are referred to as MTC groups.
  • the MTC group can be implemented to transmit a small amount of data intermittently, especially in the case of uplink synchronization, UEs belonging to the same MTC group are likely to have almost similar time / frequency synchronization since they are adjacent to each other in a limited space. high.
  • MTC UE since the amount of transmitted data is small and uplink / downlink data transmission / reception occurs occasionally, it is effective to lower the unit cost and reduce battery consumption in accordance with such a low data rate.
  • the MTC UE is characterized by low mobility, and thus has a characteristic that the channel environment is hardly changed.
  • various coverage enhancements such as repetitive transmission methods for MTC UEs for each channel / signal are considered in consideration of the poor situation in which such MTC UEs are installed in places where coverage is limited, such as basements, as well as buildings and factories. enhancement techniques are being discussed.
  • the MTC UE As a technique for low cost / low specification of the MTC UE, a reduction in the number of reception antennas, a reduction in the maximum transport block (TB) size, a reduction in the UE operating frequency bandwidth (BW), and the like may be considered.
  • the MTC UE is the actual system BW (eg, 20 MHz or 100 RBs) in terms of radio frequency (RF) and / or baseband (BB) signaling.
  • RF radio frequency
  • BB baseband
  • the signal transmission / reception operation can be implemented only for a smaller constant BW (eg, 1.4 MHz or 6 RBs).
  • the MTC UE can search for and / or detect a cell to which the MTC UE accesses by receiving and / or detecting an existing PSS / SSS / PBCH.
  • . 21 is a diagram illustrating a system BW or sub-band region for such an MTC UE.
  • a PDCCH (hereinafter, legacy PDCCH) is transmitted in all bands, while a signal for an MTC UE may be transmitted in a subband region, which is a partial region of the entire band.
  • the subband region in which the MTC UE operates may always be located in the center region of the cell (eg, the center 6 Physical Resource Block (PRB)), as shown in FIG.
  • PRB Physical Resource Block
  • multiple subbands of the MTC UE may be configured in one subframe for multiplexing in subframes between the MTC UEs.
  • different UEs may use different subbands between UEs, or may use the same subband between UEs, but may use other subbands other than the center 6 PRB region.
  • the existing EPDCCH may be used as it is, or a control channel in which the existing EPDCCH is modified may be introduced.
  • a physical downlink control channel for such a low-complexity MTC or a normal complexity MTC UE is collectively referred to as EPDCCH.
  • the physical downlink shared channel transmitted to the MTC UE should also be limited to the subband that the UE is receiving.
  • the present invention will be described on the premise that a corresponding subband or narrow band is preset for a UE.
  • the UE knows a subband set to the UE. Once configured, the subband set to the UE may be changed to another subband instead of being fixed.
  • the contents of the present invention are described on the assumption that the proposed downlink channel is used for the MTC UE, but the following can be applied even when the proposed downlink channel is not used for the MTC UE but used for another general UE. have.
  • the MTC UE In the operation of the MTC UE in a situation where the channel reception from the base station is severe and the signal reception power is very low, it is very helpful to improve the performance if the reception power or the reception energy of the downlink signal can be increased. In this case, it is particularly important to increase the received power or energy of the reference signal (RS). This is because the first MTC UE receives the downlink signal is RS, and if the channel estimation through the RS reception is not performed correctly, the reception performance is limited even if the power / energy of other channels is sufficient.
  • RS reference signal
  • a method of additionally allocating power to resource elements to which reference signals are mapped may be used to improve performance such as CRS.
  • the symbol to which the reference signal is mapped is referred to as a reference signal symbol.
  • the power added to the resource element may be power used if a signal other than the reference signal exists in a resource element other than the resource element to which the reference signal is mapped.
  • a reference signal for increasing transmission power is referred to as a first signal
  • other signals other than the first signal are referred to as a second signal.
  • a symbol to which the first signal is mapped is referred to as a first symbol
  • a symbol to which the first signal is not mapped is referred to as a second symbol.
  • the resource element (s) to which the first signal is mapped on the first symbol is referred to as a first resource element
  • the resource element (s) other than the first resource element on the first symbol is referred to as a second resource element. do.
  • a second signal, which is a signal other than the first reference signal is mapped to the second resource element.
  • Resource element (s) located on symbols other than the first reference signal symbol is referred to as a third resource element.
  • the present invention proposes to boost the power of the first signal.
  • power used when it is assumed that a signal is transmitted from a resource element other than the first resource element may be used.
  • a method of increasing the power of the first signal may be used.
  • transmission of the second signal in the first symbol may be omitted.
  • the transmission of the second signal in the second resource element can be omitted.
  • Limitations may arise in the difference in power that a base station can allocate to two different subcarriers, e.g., a first signal and the other a subcarrier used as a channel other than the first signal, which is a limitation in the base station signal output circuit implementation. According to. Therefore, it may be difficult to transmit the first signal at a very high power in one subcarrier while transmitting another signal at a very low power in another subcarrier. This problem can be solved by omitting other signal transmissions on other subcarriers.
  • the first signal may further utilize power that would have been used if the signal or channel existed.
  • the first resource element may transmit a first signal, but the signal transmission at the second resource element may be stopped. Accordingly, power in the case of assuming signal transmission in the second resource element may be additionally used for the first signal.
  • the reference signal for boosting power may include at least one of a CRS, a CSI-RS, and a DM-RS.
  • a downlink signal transmission method of the present invention will be described assuming CRS.
  • FIG. 8 is a diagram for describing a method of boosting power of a CRS according to an embodiment of the present invention.
  • FIG. 8 it is assumed that two ports of CRS are used in a general CP situation, and that the MTC region starts from OFDM symbol # 3. This means that the PDCCH transmitted in OFDM # 0, 1, 2, for example, the legacy PDCCH is not received by the MTC UE.
  • CRSs are mapped to subcarriers # 2, 5, 8, and 11 when subcarriers # 0 are the first subcarriers in symbols # 4, 7, and 11 through which CRSs are transmitted. That is, subcarriers # 2, 5, 8, and 11 correspond to the first resource element.
  • data such as another signal, for example, PDSCH
  • the base station may not transmit a signal on the subcarriers # 0, 1, 3, 4, 6, 7, 9, and 10, which are the second resource element, to the MTC UE.
  • power that may be allocated to the at least second resource element may be allocated to the first resource element.
  • data may still be transmitted in the non-CRS symbol (symbols # 3, 5, 6, 8, 9, 10, 12, and 13 of FIG. 8).
  • the MTC UE should be aware of this fact and perform the appropriate received signal processing operation on the assumption that there is no MTC signal or channel in the corresponding RE.
  • a valid signal is transmitted only in a CRS transmission subcarrier in a CRS symbol, but a valid signal is transmitted in all possible subcarriers in a non-CRS symbol. That is, in the OFDM symbol in which the CRS is transmitted, the CRS may further utilize power that would otherwise be used if the signal or channel existed, except for transmission of a signal or channel other than the CRS.
  • the transmission power of the first signal of the non-MTC region and the first signal of the MTC region may be different. This is because it is difficult to increase the power of the first signal, such as the reference signal, since the existing PDCCH must be transmitted in the non-MTC region. Therefore, in the non-MTC region, the first signal may have the same or similar transmit power as the second signal located in the same symbol.
  • the transmission power of the CRS or the transmission power in the first resource element may vary according to an area in which a corresponding signal is transmitted or an area in which the first resource element is located.
  • the CRS of the non-MTC region and the CRS of the MTC region may have different transmission powers. This is because it is difficult to increase the power of the CRS because the existing PDCCH must be transmitted in the non-MTC region. This affects the RRM / RLM / CSI measurement of the UE, because according to the conventional operation, the UE performs such measurement under the assumption that the transmit power of the CRS is always constant. Therefore, when the operation described in FIG. 8 is applied, the following operation is preferably added.
  • an operation of not transmitting another MTC signal or channel in a CRS symbol of the MTC region may be limited to some subframes.
  • Existing UEs assume that the CRS does not exist in the symbols other than the OFDM symbols # 0 and 1 in the subframe designated as the MBSFN subframe and do not perform measurement on the CRS. Therefore, the operation as described in FIG. 8 may operate to apply only to subframes configured as MBSFN subframes to existing UEs.
  • the base station may designate a kind of subframe pattern in the MTC UEs and perform the same operation as described with reference to FIG. 8 in the subframe included in the pattern, but may perform the normal operation in other subframes. That is, another MTC signal or channel may be transmitted using a non-CRS RE in the CRS symbol.
  • the base station determines the ratio of CRS power transmitted in the MTC region of the subframe in which the operation described with reference to FIG. 8 is performed and other conventional CRSs, for example, CRS power transmitted in the non-MTC region of the same subframe.
  • Signal to the MTC UE Based on this, the MTC UE can perform various measurements by appropriately combining the power-enhanced CRS and the non-enhanced CRS according to the above scheme. For example, various measurements may be performed by multiplying a weighting factor proportional to the power ratio.
  • the RRM / RLM / CSI measurement of the MTC UE may be limited by performing only the CRS of the MTC region, thereby preventing the inaccuracy of the measurement due to the CRS power difference.
  • the base station there may be four CRS ports configured by the base station.
  • the CRSs of antenna ports 0 and 1 transmitted in OFDM symbols # 0, 4, 7, and 11 in the general CP are additionally transmitted in OFDM symbols # 1 and # 8.
  • the power of the CRSs of the antenna ports 2 and 3 may be increased without transmitting other signals or channels in the symbol where the CRS is transmitted in the MTC region according to the proposal.
  • this method can cause the problem of excessive resource loss because other MTC signals or channels cannot be transmitted from the port 0 and 1 CRS symbols to the port 2 and 3 CRS. Therefore, in order to solve this problem, when 4-port CRS is set, it is possible to limit a port that does not transmit another MTC signal or channel in the CRS symbol. For example, a port not transmitting the second signal in the CRS symbol may be limited to only ports 0 and 1. That is, the operation according to the description of FIG. 8 can be performed only in the CRS symbols of the ports 0 and 1.
  • the base station since the CRSs transmitted on the ports 2 and 3 do not increase in power, at least some subframes that have no problem with the existing UE, for example, in the MBSFN subframe, although the number of CRS ports configured in the cell is 4 Even in the MTC region, the base station may operate to transmit only CRSs of ports 0 and 1. As a result, it may be operable to map other MTC signals or channels to ports 2 and 3 CRS REs.
  • the same principle can be applied to CRSs of ports 0 and 1. If not transmitting the MTC signal or channel other than the CRS in all three CRS symbols located in the MTC region, the operation may be applied to only some symbols. For example, in order to maintain a symmetrical structure between two slots, another MTC signal or channel may be transmitted in symbol # 7 without increasing CRS power, but only CRS may be transmitted in symbols # 4 and 11.
  • the first signal is a CRS signal
  • the first signal may be another RS, for example, a demodulation RS other than the CRS. That is, a method of increasing the power of the first signal without transmitting other MTC signals or channels in a symbol in which the first signal used for the MTC UE is transmitted may be performed by the first signal other than the CRS, for example, as described above. It can also be applied to demodulation RS (DM RS).
  • DM RS demodulation RS
  • FIG. 9 shows an embodiment of applying the present invention to the DM RSs of ports 7, 8, 9, 10 of the PDSCH and ports 107, 108, 109, 110 of the EPDCCH.
  • the case is a general CP, and for convenience of description, it is assumed that a CRS is not transmitted.
  • the CSI-RS transmitted by the base station for CSI measurement is the CSI-RS transmitted by the base station for CSI measurement.
  • the CSI-RS may be transmitted exceptionally. This is because CSI measurement becomes impossible when transmission of CSI-RS is omitted.
  • One method is to perform Rate Matching.
  • the corresponding REs may already be considered impossible to map and may perform an operation of mapping a symbol by avoiding the corresponding REs.
  • the corresponding REs should be excluded when determining the number of modulation symbols.
  • Another way is to perform puncturing.
  • the corresponding REs are regarded as mappable and nominally mapped, but the REs are not transmitted in the actual transmission step. In other words, an operation of allocating 0 power to the corresponding RE may be performed.
  • an operation of allocating 0 power to the corresponding RE may be performed.
  • EPDCCH In the case of EPDCCH, one PRB pair is divided into several EREGs, and each EPDCCH has a structure in which several EREGs are bundled and transmitted.
  • rate matching may be interpreted as an operation of dividing a PRB pair into an EREG, initially considering that REs of an RS symbol are unusable and not belonging to any EREG.
  • puncturing may be interpreted as resuming RSs of RS symbols, and dividing a PRB pair into EREGs so as to belong to a specific EREG, but stopping transmission in a corresponding REDC in actual EPDCCH transmission.
  • a UE can share an EPDCCH DM RS of a specific port and a PDSCH DM RS of a specific port, and the UE assumes that the base station has applied the same precoding to the two DM RS ports. Used together, it means that more accurate channel estimation is allowed. For example, assuming that there is no channel change, channel tracking may be performed by averaging channel estimation results from each DM RS.
  • a mapping relationship may be determined in advance between an EPDCCH and a PDSCH DM RS port. For example, ports 7 and 107, 8 and 108, 9 and 109, and 10 and 110 having the same structure may be set to be shared.
  • the mapping relationship between the EPDCCH scheduling the PDSCH and the corresponding PDSCH may be set.
  • the MTC UE in the coverage enhancement situation will be limited to a rank of the PDSCH.
  • a rank 1 PDSCH is transmitted in a single port transmission scheme.
  • the EPDCCH scheduling the PDSCH is a localized EPDCCH in which ECCE is mapped to one PRB pair
  • the EPDCCH also uses a single port transmission scheme, so the PDSCH DM RS and the EPDCCH DM RS scheduling the PDSCH are independent of the port index. May be determined to be shareable.
  • the UE may perform channel estimation by sharing the DM RSs of the two ports.
  • the distributed EPDCCH uses a beam cycling scheme in which two ports are used but the ports used for transmission for each RE are changed.
  • the PDSCH uses transmission based on a single port transmission scheme, it may be defined to share only one of the EPDCCH DM RSs. It can simply operate by sharing the PDSCH port with port 107, which is the first port.
  • the resharable PDSCH and EPDCCH DM RS may be determined in advance.
  • FIG. 10 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 storing the communication related information, the RF units 13 and 23 and the memory 12 and 22, and controls the components.
  • a processor 11, 21 configured to control the memory 12, 22 and / or the RF unit 13, 23 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.
  • the RF unit 13 may include N t transmit antennas, where N t is a positive integer greater than or equal to one.
  • 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 RF unit may be connected to two or more antennas.
  • the UE operates as the transmitter 10 in the uplink and operates as 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 may control the eNB RF unit to transmit a signal according to an embodiment of the present invention, for example, PDSCH, CRS, CSI-RS, DM-RS, or the like.
  • the eNB processor calculates a transmission power for the first type resource element and the second type resource element included in the subframe according to an embodiment of the present invention, allocates the first power to the first type resource element, and The second power may be additionally allocated to the first type resource element.
  • the UE processor may control the UE RF unit to receive a subframe that includes the first type resource element and the second type resource element.
  • the UE processor may measure power in the first type resource element and the second type resource element.
  • Embodiments of the present invention may be used in a base station or user equipment or other equipment in a wireless communication system.

Landscapes

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

Abstract

L'invention concerne une station de base et un appareil terminal dans un système de communication sans fil qui prend en charge un dispositif de communication de type machine (MTC). Une puissance de transmission pour un premier type d'élément de ressource et un second type d'élément de ressource inclus dans un secteur de trame est calculée, une première puissance est attribuée au premier type d'élément de ressource et une seconde puissance peut être attribuée en plus au premier type d'élément de ressource. La première puissance est une puissance de transmission calculée par rapport au premier type d'élément de ressource, et la seconde puissance tombe en dessous d'une puissance dont la valeur est inférieure ou égale à celle de la puissance de transmission calculée par rapport au second type d'élément de ressource.
PCT/KR2016/000464 2015-01-16 2016-01-15 Procédé de régulation de puissance pour la communication de type machine, et appareil à cet effet WO2016114628A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201562104084P 2015-01-16 2015-01-16
US62/104,084 2015-01-16

Publications (1)

Publication Number Publication Date
WO2016114628A1 true WO2016114628A1 (fr) 2016-07-21

Family

ID=56406099

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2016/000464 WO2016114628A1 (fr) 2015-01-16 2016-01-15 Procédé de régulation de puissance pour la communication de type machine, et appareil à cet effet

Country Status (1)

Country Link
WO (1) WO2016114628A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107889148A (zh) * 2016-09-30 2018-04-06 中兴通讯股份有限公司 一种测量参考信号和控制信道的发送方法及装置
CN109392115A (zh) * 2017-08-10 2019-02-26 上海朗帛通信技术有限公司 一种被用于无线通信的用户设备、基站中的方法和装置
CN109818712A (zh) * 2017-11-22 2019-05-28 大唐移动通信设备有限公司 一种基于窄带物联网的npdcch盲检方法和装置
CN112153738A (zh) * 2019-06-26 2020-12-29 中国移动通信有限公司研究院 一种配置方法、装置、网络侧设备及计算机可读存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140112177A1 (en) * 2011-05-10 2014-04-24 Lg Electronics Inc. Method for receiving reference signal and user equipment, and method for transmitting reference signal and base station
WO2014069944A1 (fr) * 2012-11-01 2014-05-08 엘지전자 주식회사 Procédé et appareil d'émission/réception de données au sein d'un système de communication sans fil
WO2014107030A1 (fr) * 2013-01-02 2014-07-10 엘지전자 주식회사 Procédé de transmission de données pour un terminal dans un système de communication sans fil, et terminal utilisant ledit procédé
US20140328230A1 (en) * 2011-10-19 2014-11-06 Lg Electronics Inc. Method for allowing mtc terminal to transmit and receive signal in wireless communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140112177A1 (en) * 2011-05-10 2014-04-24 Lg Electronics Inc. Method for receiving reference signal and user equipment, and method for transmitting reference signal and base station
US20140328230A1 (en) * 2011-10-19 2014-11-06 Lg Electronics Inc. Method for allowing mtc terminal to transmit and receive signal in wireless communication system
WO2014069944A1 (fr) * 2012-11-01 2014-05-08 엘지전자 주식회사 Procédé et appareil d'émission/réception de données au sein d'un système de communication sans fil
WO2014107030A1 (fr) * 2013-01-02 2014-07-10 엘지전자 주식회사 Procédé de transmission de données pour un terminal dans un système de communication sans fil, et terminal utilisant ledit procédé

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HUAWEI ET AL.: "Transmission Modes supported by Low Cost MTC UFs", R1-141943, 3GPP TSG RAN WG1 MEETING #77, 10 May 2014 (2014-05-10), Seoul, Korea *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107889148A (zh) * 2016-09-30 2018-04-06 中兴通讯股份有限公司 一种测量参考信号和控制信道的发送方法及装置
US11277759B2 (en) 2016-09-30 2022-03-15 Xi'an Zhongxing New Software Co., Ltd Method and device for transmitting signal, and storage medium
CN107889148B (zh) * 2016-09-30 2022-11-15 中兴通讯股份有限公司 信号发送接收及信道发送检测方法、装置、设备和介质
US11930386B2 (en) 2016-09-30 2024-03-12 Zte Corporation Method and device for transmitting signal, and storage medium
CN109392115A (zh) * 2017-08-10 2019-02-26 上海朗帛通信技术有限公司 一种被用于无线通信的用户设备、基站中的方法和装置
CN109392115B (zh) * 2017-08-10 2022-12-27 上海朗帛通信技术有限公司 一种被用于无线通信的用户设备、基站中的方法和装置
CN109818712A (zh) * 2017-11-22 2019-05-28 大唐移动通信设备有限公司 一种基于窄带物联网的npdcch盲检方法和装置
CN109818712B (zh) * 2017-11-22 2021-02-19 大唐移动通信设备有限公司 一种基于窄带物联网的npdcch盲检方法和装置
CN112153738A (zh) * 2019-06-26 2020-12-29 中国移动通信有限公司研究院 一种配置方法、装置、网络侧设备及计算机可读存储介质

Similar Documents

Publication Publication Date Title
WO2016048027A2 (fr) Procédé et équipement d'utilisateur pour recevoir des signaux de liaison descendante, et procédé et station de base pour transmettre des signaux de liaison descendante
WO2016126119A1 (fr) Procédé d'émission et de réception de signal dans un système de communication sans fil, et appareil associé
WO2017010798A1 (fr) Procédé et équipement utilisateur permettant de recevoir un signal de liaison descendante, et procédé et station de base servant à émettre un signal de liaison descendante
WO2016053047A1 (fr) Procédé et équipement d'utilisateur pour émettre un signal de liaison montante, ainsi que procédé et équipement d'utilisateur pour recevoir un signal de liaison montante
WO2017069470A1 (fr) Procédé et équipement d'utilisateur pour recevoir des signaux de liaison descendante, et procédé et station de base pour transmettre des signaux de liaison descendante
WO2018030766A1 (fr) Procédé d'émission et de réception de signaux sans fil et dispositif associé
WO2016159740A1 (fr) Procédé de transmission et de réception d'un signal dans un système de communication sans fil et dispositif associé
WO2016018056A1 (fr) Procédé et équipement utilisateur pour recevoir des informations de commande de liaison descendante, et procédé et station de base pour transmettre des informations de commande de liaison descendante
WO2016114593A1 (fr) Procédé et équipement utilisateur permettant d'envoyer un signal de liaison montante, et procédé et station de base permettant de recevoir un signal de liaison montante
WO2016021958A1 (fr) Procédé d'émission de signal en liaison montante et équipement d'utilisateur, et procédé de réception de signal en liaison montante et station de base
WO2016122242A2 (fr) Procédé de réception d'informations de commande en liaison montante et équipement d'utilisateur associé, ainsi que procédé d'émission d'informations de commande en liaison descendante et station de base associée
WO2016021957A1 (fr) Procédé de rétroaction d'acquittement/non-acquittement et équipement utilisateur
WO2016108674A1 (fr) Procédé d'émission de signal de liaison montante et équipement d'utilisateur, et procédé de réception de signal de liaison montante et station de base
WO2017039373A1 (fr) Procédé et appareil d'indication de décalage de fréquence centrale pour ue à bande étroite dans un système de communications sans fil
WO2015012666A1 (fr) Procédé d'émission d'un signal pour mtc et appareil à cet effet
WO2016117984A1 (fr) Procédé permettant d'émettre/de recevoir un signal dans un système de communication sans fil prenant en charge la communication de type machine et dispositif associé
WO2017209547A1 (fr) Procédé de réception de signaux en liaison descendante et équipement d'utilisateur, et procédé d'émission de signaux en liaison descendante et station de base
WO2016048044A1 (fr) Procédé et appareil d'exécution de procédure d'accès initial pour un équipement d'utilisateur à faible coût dans un système de communications sans fil
WO2016093618A1 (fr) Procédé de terminal pour rapporter des informations d'états de canal et appareil destiné au procédé dans un système de communication sans fil prenant en charge une agrégation de porteuses
WO2016153290A1 (fr) Procédé de transmission de données de liaison montante et équipement utilisateur, et procédé de réception de données de liaison montante et station de base
WO2016209056A1 (fr) Procédé et appareil d'émission/réception de signal de terminal de communications de dispositif à dispositif dans un système de communications sans fil
WO2012150822A2 (fr) Procédé de réception d'un signal de liaison descendante, dispositif utilisateur, procédé d'émission d'un signal de liaison descendante, et station de base associée
WO2013027963A2 (fr) Procédés de transmission et de réception d'informations de commande de liaison montante, équipement utilisateur et station de base
WO2016182394A1 (fr) Procédé et appareil pour la transmission et la réception en liaison montante dans un système de communication sans fil
WO2013043026A2 (fr) Équipement utilisateur et procédé de transmission d'un signal de liaison montante, et station de base et procédé destinés à recevoir un signal de liaison montante

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16737592

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16737592

Country of ref document: EP

Kind code of ref document: A1