WO2018062890A1 - Procédé permettant de transmettre et de recevoir des informations de commande dans un système de communication sans fil, et appareil correspondant - Google Patents

Procédé permettant de transmettre et de recevoir des informations de commande dans un système de communication sans fil, et appareil correspondant Download PDF

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Publication number
WO2018062890A1
WO2018062890A1 PCT/KR2017/010807 KR2017010807W WO2018062890A1 WO 2018062890 A1 WO2018062890 A1 WO 2018062890A1 KR 2017010807 W KR2017010807 W KR 2017010807W WO 2018062890 A1 WO2018062890 A1 WO 2018062890A1
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information
region
cfi
control
frequency
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PCT/KR2017/010807
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English (en)
Korean (ko)
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신석민
양석철
박한준
서인권
이윤정
황대성
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엘지전자(주)
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method for a terminal for transmitting and receiving control information and an apparatus supporting the same.
  • Mobile communication systems have been developed to provide voice services while ensuring user activity.
  • the mobile communication system has expanded not only voice but also data service, and the explosive increase in traffic causes shortage of resources and users require faster services. Therefore, a more advanced mobile communication system is required. .
  • the present specification proposes a method for transmitting and receiving control information in a wireless communication system.
  • the present specification proposes a method for setting and / or transmitting a two-dimensional two-dimensional channel format indicator (CFI).
  • CFI channel format indicator
  • the present specification proposes a method of allocating a control channel element (CCE) of a control channel region when a two-dimensional CFI is used.
  • CCE control channel element
  • the present specification proposes an operation method for setting a control region when the CFI reception of the terminal fails.
  • the method may include a specific subband to which the terminal belongs among a plurality of subbands from a base station.
  • the control format indicator (CFI) indicates that the information indicating the control region includes time information indicating a time resource region of the control region and a frequency resource region of the control region ( frequency information indicating a frequency resource region).
  • the frequency information may include information indicating a starting subcarrier of the control region.
  • the frequency information may be set in a unit of a subcarrier set, and the subcarrier set may include a preset number of one or more subcarriers. .
  • the frequency information may further include information indicating the number of subcarrier sets occupying the control area.
  • configuration information of the starting subcarrier of the control region may be set in units of the subcarrier aggregation.
  • the size of the information representing the control region depends on the product of the number of candidates for the time resource region and the number of candidates for the frequency resource region.
  • the number of candidates for the frequency resource region may be determined according to the number of candidate positions of the starting subcarrier.
  • the number of candidates for the frequency resource region is determined by a sum of integers from 1 to the number of candidate positions, and the number of candidate positions is specified.
  • the number of subcarriers included in the subband and the number of subcarriers included in the subcarrier aggregation unit may be determined.
  • the time information is indicated according to a first period
  • the frequency information is indicated according to a second period
  • the second period is It may be set to a value larger than the first period
  • the time information may be a value belonging to any one of a plurality of sets each configured with a different combination of multiples of a slot size. Can be.
  • control format indicator may include a predetermined physical control format indicator channel (PCFICH) or specific downlink control information (PCFICH). downlink control information).
  • PCFICH physical control format indicator channel
  • PCFICH specific downlink control information
  • the terminal is a RF (Radio Frequency) unit for transmitting and receiving a radio signal and a processor functionally connected to the RF unit
  • the processor may include, from a base station, information indicating a control region set in a specific subband to which the terminal belongs among a plurality of subbands, and from the base station, the control Control to receive downlink control information through a region, the information indicating the control region is indicated through a control format indicator (CFI), the information indicating the control region, the Time information indicating a time resource region of the control region and a frequency resource of the control region It includes frequency information indicating a frequency resource region.
  • CFI control format indicator
  • the frequency information may include information indicating a starting subcarrier of the control region.
  • the frequency information may be set in units of a subcarrier set, and the subcarrier set may include a preset number of one or more subcarriers. .
  • an optimized scheduling for a control channel region may be performed. It works.
  • Figure 1 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.
  • FIG. 2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification may be applied.
  • FIG. 3 illustrates an example of a resource grid supported by a wireless communication system to which the method proposed in the present specification can be applied.
  • FIG. 4 shows examples of an antenna port and a neuralology-specific resource grid to which the method proposed in this specification can be applied.
  • FIG 5 shows an example of a self-contained subframe structure to which the method proposed in this specification can be applied.
  • FIG. 6 shows an example of a common control region in a subband to which the method proposed in this specification can be applied.
  • FIG. 7 illustrates an example of a method for transmitting a control format indicator (CFI) through a preset region to which the method proposed in the present specification can be applied.
  • CFI control format indicator
  • FIG 8 shows another example of a CFI transmission method through a preset region to which the method proposed in this specification can be applied.
  • FIG 9 shows another example of a CFI transmission method through a preset region to which the method proposed in this specification can be applied.
  • DCI 10 shows an example of a CFI transmission method through downlink control information (DCI) to which the method proposed in the present specification can be applied.
  • DCI downlink control information
  • FIG 11 shows another example of a CFI transmission method through DCI to which the method proposed in the present specification can be applied.
  • FIG. 13 shows an example of a CFI transmission method for transmitting a plurality of control region information to which the method proposed in this specification can be applied.
  • FIG. 16 is a flowchart illustrating an operation of a terminal for transmitting and receiving control information to which the method proposed in the present specification can be applied.
  • FIG. 17 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.
  • FIG. 18 is a block diagram illustrating a communication device according to one embodiment of the present invention.
  • a base station has a meaning as a terminal node of a network that directly communicates with a terminal.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a base station (BS) is a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), a general NB (generation NB) May be replaced by such terms.
  • a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.
  • UE user equipment
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS Advanced Mobile Station
  • WT Wireless Terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • 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
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA).
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A (advanced) is the evolution of 3GPP LTE.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
  • next-generation wireless access technologies can provide faster service to more users than traditional communication systems (or traditional radio access technologies) (e.g., enhanced mobile broadband communication). ) Needs to be considered.
  • a design of a communication system considering a machine type communication (MTC) that provides a service by connecting a plurality of devices and objects has been discussed.
  • a design of a communication system eg, Ultra-Reliable and Low Latency Communication (URLLC)
  • URLLC Ultra-Reliable and Low Latency Communication
  • NR New RAT
  • NR system the radio communication system to which the NR is applied.
  • eLTE eNB An eLTE eNB is an evolution of an eNB that supports connectivity to EPC and NGC.
  • gNB Node that supports NR as well as connection with NGC.
  • New RAN A radio access network that supports NR or E-UTRA or interacts with NGC.
  • Network slice A network slice defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements with end-to-end coverage.
  • Network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.
  • NG-C Control plane interface used for the NG2 reference point between the new RAN and NGC.
  • NG-U User plane interface used for the NG3 reference point between the new RAN and NGC.
  • Non-standalone NR A deployment configuration where a gNB requires an LTE eNB as an anchor for control plane connection to EPC or an eLTE eNB as an anchor for control plane connection to NGC.
  • Non-Standalone E-UTRA Deployment configuration in which the eLTE eNB requires gNB as an anchor for control plane connection to NGC.
  • User plane gateway The endpoint of the NG-U interface.
  • FIG. 1 is a view showing an example of the overall system structure of the NR to which the method proposed in this specification can be applied.
  • the NG-RAN consists of gNBs that provide control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and UE (User Equipment).
  • RRC control plane
  • the gNBs are interconnected via an Xn interface.
  • the gNB is also connected to the NGC via an NG interface.
  • the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and to a User Plane Function (UPF) through an N3 interface.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • the numerology may be defined by subcarrier spacing and cyclic prefix overhead.
  • the plurality of subcarrier intervals may be represented by an integer N (or, Can be derived by scaling. Further, even if it is assumed that very low subcarrier spacing is not used at very high carrier frequencies, the used numerology may be selected independently of the frequency band.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDM numerologies supported in the NR system may be defined as shown in Table 1.
  • the size of the various fields in the time domain Is expressed as a multiple of the time unit. From here, ego, to be.
  • Downlink and uplink transmissions It consists of a radio frame having a section of (radio frame).
  • each radio frame is It consists of 10 subframes having a section of.
  • FIG. 2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification may be applied.
  • the transmission of an uplink frame number i from a user equipment (UE) is greater than the start of the corresponding downlink frame at the corresponding UE. You must start before.
  • slots within a subframe Numbered in increasing order of within a radio frame They are numbered in increasing order of.
  • One slot is Consists of consecutive OFDM symbols of, Is determined according to the numerology and slot configuration used. Slot in subframe Start of OFDM symbol in the same subframe Is aligned with the beginning of time.
  • Not all terminals can transmit and receive at the same time, which means that not all OFDM symbols of a downlink slot or an uplink slot can be used.
  • Table 2 shows numerology Shows the number of OFDM symbols per slot for a normal CP in Table 3, This indicates the number of OFDM symbols per slot for the extended CP in.
  • an antenna port In relation to physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. Can be considered.
  • the antenna port is defined so that the channel on which the symbol on the antenna port is carried can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of a channel carrying a symbol on one antenna port can be deduced from the channel carrying the symbol on another antenna port, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship.
  • the wide range characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG 3 shows an example of a resource grid supported by a wireless communication system to which the method proposed in the present specification can be applied.
  • the resource grid is in the frequency domain
  • one subframe includes 14 x 2 u OFDM symbols, but is not limited thereto.
  • the transmitted signal is One or more resource grids composed of subcarriers, and Is described by the OFDM symbols of. From here, to be. remind Denotes the maximum transmission bandwidth, which may vary between uplink and downlink as well as numerologies.
  • the numerology And one resource grid for each antenna port p.
  • FIG. 4 shows examples of an antenna port and a neuralology-specific resource grid to which the method proposed in this specification can be applied.
  • each element of the resource grid for antenna port p is referred to as a resource element and is an index pair Uniquely identified by From here, Is the index on the frequency domain, Refers to the position of a symbol within a subframe. Index pair when referring to a resource element in a slot This is used. From here, to be.
  • Numerology Resource elements for antenna and antenna port p Is a complex value Corresponds to If there is no risk of confusion, or if no specific antenna port or numerology is specified, the indices p and Can be dropped, so the complex value is or This can be
  • the physical resource block (physical resource block) is in the frequency domain It is defined as consecutive subcarriers. On the frequency domain, the physical resource blocks can be zero Numbered until. At this time, a physical resource block number on the frequency domain And resource elements The relationship between is given by Equation 1.
  • the terminal may be configured to receive or transmit using only a subset of the resource grid.
  • the set of resource blocks set to be received or transmitted by the UE is from 0 on the frequency domain. Numbered until.
  • the TDD (Time Division Duplexing) structure considered in the NR system is a structure that processes both uplink (UL) and downlink (DL) in one subframe. This is to minimize latency of data transmission in the TDD system, and the structure is referred to as a self-contained subframe structure.
  • 5 shows an example of a self-contained subframe structure to which the method proposed in this specification can be applied. 5 is merely for convenience of description and does not limit the scope of the present invention.
  • one subframe includes 14 orthogonal frequency division multiplexing (OFDM) symbols.
  • OFDM orthogonal frequency division multiplexing
  • an area 502 means a downlink control region
  • an area 504 means an uplink control region.
  • regions other than regions 502 and 504 may be used for transmission of downlink data or uplink data.
  • uplink control information and downlink control information are transmitted in one self-contained subframe.
  • uplink data or downlink data is transmitted in one self-contained subframe.
  • downlink transmission and uplink transmission may proceed sequentially, and transmission of downlink data and reception of uplink ACK / NACK may be performed. .
  • a base station eNodeB, eNB, gNB
  • a terminal user equipment (UE)
  • UE user equipment
  • a time gap is required for the process or the process of switching from the reception mode to the transmission mode.
  • some OFDM symbol (s) may be set to a guard period (GP).
  • multiple (or multiple) antennas may be installed in the same area.
  • the wavelength is about 1cm
  • the antennas are installed at 0.5 lambda intervals on a panel of 5cm x 5cm according to the 2-dimension arrangement, a total of 100 Antenna elements may be installed.
  • a method of increasing coverage or increasing throughput may be considered by increasing beamforming (BF) gain using a plurality of antenna elements.
  • BF beamforming
  • TXRU Transceiver Unit
  • the method of installing TXRU in all antenna elements may be ineffective in terms of price. Accordingly, a method of mapping a plurality of antenna elements to one TXRU and controlling the direction of the beam by using an analog phase shifter may be considered.
  • hybrid beamforming with B TXRUs which is less than Q antenna elements, may be considered as an intermediate form between digital beamforming and analog beamforming.
  • the direction of the beam capable of transmitting signals at the same time may be limited to B or less.
  • a method of transmitting a synchronization signal using an analog beamforming method may be considered.
  • the base station may transmit a beam direction differently for each symbol at a time point when the synchronization signal is transmitted (for example, a sync subframe).
  • each terminal may perform synchronization with respect to time and / or frequency based on a synchronization signal transmitted in a beam direction most suitable to (ie, suitable for) its own.
  • the NR system also supports usage scenarios with different service requirements.
  • the NR system can support various usage scenarios, such as enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), Ultra-Reliable and Low Latency Communications (URLLC), and the like.
  • eMBB enhanced Mobile BroadBand
  • mMTC massive Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communications
  • KPIs Key Performance Indicators
  • the usage scenarios may include numerology (eg, subcarrier spacing, subframe length, CP length) CP length) and / or system design may need to be set differently. It also supports multiple usage scenarios with different numerologies in one NR system, and the multiple usage scenarios can be multiplexed.
  • a common RS such as a cell-specific RS (CRS) is used for channel estimation.
  • CRS cell-specific RS
  • UE-specific DMRS UE-specific DMRS
  • common control is transmitted through a control format indicator (CFI) in a state in which a frequency region in which common control (ie, common control information) can be transmitted is preset (or determined).
  • CFI control format indicator
  • the common control information may mean control information that can be commonly applied to terminals allocated to the corresponding frequency band.
  • each terminal may be allocated to different frequency subbands according to the type of service (eg, usage scenario) that it wants to use.
  • frequency regions of a common control region may be independently set for each terminal even within the same frequency subband.
  • the common control region may mean a resource region that can be commonly monitored (or viewed) by terminals allocated to the corresponding subband.
  • the common control region may refer to a common control channel region, a control region, a control channel region, or a resource region in which a control channel (eg, PDCCH) is transmitted.
  • the base station may be configured to inform each terminal of information about the frequency domain and the time domain (ie, two-dimensional information) for the common control region to be allocated. That is, in the NR system, the base station needs to transmit two-dimensional information indicating the frequency and time to indicate the common control region to the terminal.
  • the following specification proposes a method for setting and transmitting a two dimensional CFI and a method for CCE allocation when two dimensional CFI is used.
  • the present specification looks at the operation method when the reception of the CFI fails (failure).
  • the 2D CFI may refer to a CFI that delivers both information indicating a time resource region of a common control region and frequency information indicating a frequency resource region of the common control region.
  • the NR system supports multiple services (or usage scenarios) having (or using) different neurology.
  • different neurology can be multiplexed.
  • multiple terminals may be allocated to a specific subband having the same neurology.
  • each terminal intending to use the corresponding subband has common control region information (ie, common control region) through its control format indicator (CFI) having two-dimensional information with respect to its common control region.
  • CFI control format indicator
  • the CFI may include three types of information as follows.
  • the number of allocations to the time axis (e.g. number of allocated symbols)
  • the number of allocations to the frequency axis (e.g. the number of subcarrier sets)
  • the information about the number of allocations from the two-dimensional CFI to the time axis may be similar to that of the legacy TLE system.
  • the base station may transmit information on how many OFDM symbols to transmit common control information for each terminal.
  • the base station may transmit information indicating the number of OFDM symbols to be used for transmitting common control information for each terminal to each terminal.
  • the corresponding information may mean time information indicating a time resource region of the common control region.
  • a method of configuring (or setting) a specific number of subcarriers into one set sets a basic unit on the frequency axis.
  • the subcarrier set may be set to 12, which is the number of subcarriers of a resource block (RB).
  • the base station may transmit information on how many subcarrier sets for each terminal to transmit common control information.
  • the base station may transmit information indicating the number of subcarrier sets to be used for transmitting common control information for each terminal to each terminal.
  • the corresponding information may mean frequency information indicating a frequency resource region of the common control region.
  • the maximum number of subcarrier sets that can be allocated to the common control region is larger than the value obtained by dividing the total number of subcarriers constituting the subband by the above-described basic unit Corresponds to an integer value that is less than or equal to
  • information about the starting symbol on the time axis is set by transmitting common control information from the first symbol (# 0 symbol). It may be considered a method that does not transmit. This is because transmission of common control information from the first symbol is advantageous in terms of low latency.
  • a method of transmitting location information ie, information indicating a starting subcarrier for an independent starting subcarrier for each terminal may be set. Can be considered. At this time, the position information on the starting subcarrier may be set for one subcarrier (that is, for all subcarriers).
  • this method may be inefficient as the amount (or size) of information to be transmitted by the base station to the terminal increases.
  • the base station can efficiently deliver the position information for the starting subcarrier.
  • the starting subcarrier of a particular subband having the same numerology (or supporting) is set to zero, and the position (ie subcarrier) separated by the base unit (or basic unit size) is The position set to 1, and the position separated by twice the basic unit may be set to 2. That is, the setting information about the starting subcarrier may be set based on the above-described basic unit.
  • the base station may transmit information about the starting subcarrier to the terminal using a smaller amount of information.
  • 6 shows an example of a common control region in a subband to which the method proposed in this specification can be applied. 6 is merely for convenience of description and does not limit the scope of the present invention.
  • L denotes a basic unit on the frequency axis described above
  • SC N denotes the number of subcarriers of the corresponding subband.
  • L resource blocks
  • SC N is 12 *. 50.
  • the position of the starting subcarrier is Is set to one of That is May mean the number of candidate positions of the starting subcarrier.
  • the starting subcarrier position may be set to one of five (0, 1, 2, 3, 4).
  • x is a starting sub Minimum 1 to maximum in each case where the position of the carrier may have It can have a value up to.
  • x is one of (5, 4, 3, 2, 1) when the position of the starting subcarrier is set to 0, and (4) when the position of the starting subcarrier is set to 1 (4).
  • 3, 2, 1) and if the position of the starting subcarrier is set to 2, it is one of (3, 2, 1), and if the position of the starting subcarrier is set to 3, it is one of (2, 1) , 1 if the position of the starting subcarrier is set to 4.
  • x may mean one of the number of subcarrier sets that can be set as a common control region according to the position of the starting subcarrier (if there is only one possible case).
  • the number of all possible candidates for transmitting necessary information on the frequency axis is from 1 Integer sum up to (i.e. ).
  • the number of candidates for the frequency resource region may be set (or determined or calculated) according to the number of candidate positions of the starting subcarrier.
  • the number of candidates for the information representing the common control region is equal to X and the frequency resource region.
  • Can be calculated (or determined) by the product of the number of candidates for (i.e., the total number of candidates ).
  • the size (eg, number of bits) of the information indicating the common control region may be determined according to the product of the number of candidates for the time resource region and the number of candidates for the frequency resource region.
  • the base station uses a smaller amount of information to determine the starting subcarrier position. You can also pass information. For example, a method may be considered that sets it to be the starting subcarrier every multiple of two or every 2 n (where n is a positive integer including 0).
  • a method of simultaneously transmitting information on the frequency resource domain and information on the time domain may be considered.
  • the length of the code may be longer.
  • a method of transmitting information on the frequency resource region using a relatively long period and transmitting the information on the time resource region using a relatively short period may be considered. More specifically, the method of informing the information of the time resource region when the information about the frequency resource region is transmitted, or when the information about the frequency resource region is transmitted, the time allocation value is a default value (for example, 1). Symbol) may be considered.
  • the time allocation value may refer to a time allocation information value, a time resource allocation value, or a value indicated by information on a time resource region.
  • the terminal after the terminal receives the information on the frequency resource region, it may be set that the information on the frequency resource region is not changed until receiving the information on the next frequency resource region.
  • the information about the time resource region since the information about the time resource region is frequently transmitted in a relatively short period, the information about the time resource region may be set to change according to the transmitted time allocation value. This method reduces the burden on the code length as the amount of information to be transmitted at a time is smaller than that described above.
  • a method of fixing a time allocation value to 1 symbol and periodically transmitting information on a frequency resource region may be considered.
  • the method can be applied to a service requiring very short latency such as URLLC of an NR system.
  • a method of joint coding may be considered to determine a set of values that a time allocation value may have according to the information on the frequency resource region.
  • a method of joint coding may be considered to determine a set of values that the frequency allocation value may have according to the information on the time resource region.
  • the frequency allocation value may refer to a frequency allocation information value, a frequency resource allocation value, or a value indicated by information on a frequency resource region.
  • the time allocation value is 1
  • the symbol may be set to be determined among two symbols.
  • the time allocation value may be set to be determined among 1 symbol or 3 symbols.
  • the joint coding scheme described in the method may be applied to each of the three methods described above.
  • the information on the frequency resource region may be transmitted through higher layer signaling (eg, RRC signaling, MAC CE, etc.), and a method of periodically transmitting only information on the time resource region may be considered.
  • higher layer signaling eg, RRC signaling, MAC CE, etc.
  • the value transmitted through the CFI may be set as in the following examples.
  • the base station may transmit a value of one of a set represented by symbol numbers greater than 1 while including 1, which is the minimum number of symbols.
  • the base station may be configured to transmit a value belonging to one set of ⁇ 1, 2, 4 ⁇ , ⁇ 1, 2, 3 ⁇ , or ⁇ 1, 2, 3, 4 ⁇ through the CFI.
  • the smallest number of symbols to be transmitted over the CFI is determined to be 2, and the base station may transmit a value of one of a set including 2 and representing the number of symbols greater than 2.
  • symbol numbers greater than two may be represented by multiples of two.
  • the base station may be configured to transmit a value belonging to one of the set of ⁇ 2, 4, 6 ⁇ , ⁇ 2, 4, 8 ⁇ , or ⁇ 2, 4, 6, 8 ⁇ through the CFI.
  • the smallest number of symbols to be transmitted through the CFI is determined as a slot size, and the base station may transmit a value of one of a set represented by the number of symbols smaller than the slot size.
  • symbol numbers smaller than the slot size may be represented by a maximum positive integer less than 1/2 of the slot size, or a maximum positive integer less than 1/4 of the slot size.
  • the base station uses a CFI to ⁇ , , slot size ⁇ , ⁇ , , slot size ⁇ , ⁇ , , slot size ⁇ , or ⁇ , , , slot size ⁇ may be set to transmit a value belonging to one set.
  • the smallest number of symbols to be sent over CFI is determined by the slot size
  • the base station is one of a set represented by numbers smaller than the slot size by x symbols (where x is a positive integer). You can send the value of.
  • the base station is ⁇ slot size-2, slot size-1, slot size ⁇ , ⁇ slot size-3, slot size-1, slot size ⁇ , or ⁇ slot size-3, slot size-2, through CFI slot size-1, slot size ⁇ can be set to transmit a value belonging to one set.
  • the set to select for transmitting the CFI value as described above i.e., the set used to select the value to be transmitted over the CFI
  • the set used to select the value to be transmitted over the CFI is different depending on the combination of the neurology between control (i.e., control information) and data. Can be set.
  • ⁇ 1, 2, 4 ⁇ , ⁇ 1, 2, 3 ⁇ , or ⁇ 1, 2, 3, 4 ⁇ described above are set to be used when the same numerology is applied to control information and data.
  • the ⁇ 2, 4, 6 ⁇ , ⁇ 2, 4, 8 ⁇ , or ⁇ 2, 4, 6, 8 ⁇ described above does not apply the same numerology to the control information and the data (for example, control information). May be set to be used in the case where the numerology of is twice the neurology of the data).
  • the set used i.e., the CFI set
  • the CFI set is defined as ⁇ 1, 2, 4 ⁇ , ⁇ 1, 2, 3 ⁇ or y times ⁇ 1, 2, 3, 4 ⁇ .
  • the set of selecting to transmit the CFI value (that is, the set used to select the value transmitted through the CFI) is set in advance, and then higher layer signaling (ie, higher layer configuration) is selected.
  • the setting method may be considered.
  • the length of the common control region ie, the length of the control region for the corresponding subband may be determined through the following methods.
  • the terminal uses a CFI value (ie, information transmitted through the CFI) received from the base station. It can be set to determine the control area.
  • the base station may be configured to inform the terminal of the number of symbols not included in the common control region from the specific point through the CFI value.
  • the specific point may be set variously.
  • the specific point may be set as the last symbol of a DL burst.
  • the method applies when control information is delivered over an entire slot or DL burst (e.g., enhanced PDCCH (ePDCCH)), the control information affects other control signals such as CSI-RS. It may be applied to a situation in which it is necessary to advance the common control area in order to avoid the problem.
  • ePDCCH enhanced PDCCH
  • the particular point may be set to the last symbol of the slot.
  • control information such as ePDCCH is transmitted only in a DL heavy subframe (that is, a subframe in which DL is allocated more than UL)
  • it is determined whether an UpPTS region exists that is, whether the subframe is DL only or DL heavy).
  • the specific point may be equal to the maximum number of OFDM symbols of the common control region allocated when the control sub-band is configured.
  • the maximum number of OFDM symbols may be set differently according to the size of the control subband and / or the control channel capacity.
  • the first method is a method of transmitting CFI information through a preset (or promised, defined) region (eg, a physical control format indicator channel (PCFICH)).
  • the second method is a method of transmitting CFI information using downlink control information (DCI) through a preset common search space (CSS).
  • DCI downlink control information
  • SCS preset common search space
  • the first method that is, a method of transmitting CFI information through a preset region, will be described in detail.
  • the first method may be divided into three methods according to the assignment method of subbands.
  • the method is a method for transmitting CFI in a specific time and / or frequency domain for every subband (method 1-1), and a plurality of preset (or promised) PRBs (or PRB sets)
  • the method can be divided into a method of transmitting CFI in a specific time and / or frequency domain (method 1-2), and a method of transmitting CFI in an aligned sub-band (method 1-3). have. This division is only for convenience of description, and the above methods may be combined and applied to each other.
  • Method 1-1 An example to which Method 1-1 may be applied is as follows. It may be considered that there are terminals that have completed an initial access procedure in a specific network, and that a subband that can be monitored by the terminals is smaller than the system bandwidth. In this case, when the subbands are allocated without overlapping each other and without empty space within the corresponding system bandwidth, the base station may be configured to transmit the CFI in a predetermined time and / or frequency domain for each subband. .
  • the terminals monitoring each subband receive the CFI transmitted as described above, and determine (or identify) a common control region (that is, a control region set in a specific subband to which the terminal belongs) to be monitored. )can do.
  • a common control region that is, a control region set in a specific subband to which the terminal belongs
  • 7 shows an example of a CFI transmission method through a preset region to which the method proposed in the present specification can be applied. 7 is merely for convenience of description and does not limit the scope of the invention.
  • the black area represents the area where the CFI is transmitted (ie, the CFI area)
  • the hatched area represents the control channel area (ie, the common control area set in the corresponding subband).
  • the hatched regions of FIG. 7 may refer to a sub-band specific control region which can be commonly monitored by terminals belonging to the corresponding subband.
  • the base station may be configured to transmit CFI in a preset (or determined) time and / or frequency domain (or location).
  • CFI time and / or frequency domain (or location).
  • the region where the control channel is transmitted is each sub-sub.
  • Each band may be set to be independent. In other words, as shown in FIG. 7, the common control region set in each subband may be set in different forms among the subbands.
  • the terminal (s) may determine (or recognize) the control channel region of the subband to which it belongs by using a time and / or frequency value transmitted through the CFI.
  • Method 1-2 may be applied is as follows. It may be considered that there are terminals that have completed the initial access procedure in a specific network, and that the subbands that the terminals can monitor are smaller than the system bandwidth. In this case, when subbands existing within the corresponding system bandwidth are allocated without considering overlap and / or empty space, the CFI may be configured to select and transmit one or more specific PRBs (or PRB sets).
  • the subbands allocated within the corresponding system bandwidth may be configured to view even one of the one or more specific PRBs (or PRB sets).
  • the corresponding subbands may be configured to include at least one of the one or more specific PRBs (or PRB sets).
  • the one or more specific PRBs (or PRB sets) may be preset (or promised, defined) specific PRBs (or PRB sets) (s)
  • the CFI may be specific PRBs (or PRB sets) (s). May be transmitted in a specific time and / or frequency domain of a.
  • the CFI is transmitted through independent CFI information (ie, CFI) for each subband using additional information.
  • CFI CFI information
  • a sub-band ID may be used to distinguish the CFI for each subband.
  • information transmitted through the CFI may be commonly set for the subbands.
  • the terminals monitoring each subband may receive the CFI transmitted as described above, and may determine a common control region (that is, a control region set in a specific subband to which the terminal belongs) to be monitored. . Specific examples for Method 1-2 are shown in FIG. 8.
  • 8 shows another example of a CFI transmission method through a preset region to which the method proposed in this specification can be applied. 8 is merely for convenience of description and does not limit the scope of the present invention.
  • the black area represents the area where the CFI is transmitted (ie, the CFI area)
  • the hatched area represents the control channel area (ie, the common control area set in the corresponding subband).
  • the hatched regions in FIG. 8 may refer to a sub-band specific control region that can be commonly monitored by terminals belonging to the corresponding subband.
  • the base station determines a specific time and / or frequency of one or more specific PRBs (or PRB sets) preset as described above.
  • CFI may be transmitted in an area (or location).
  • the specific time and / or frequency region of the one or more specific PRBs may refer to the black region shown in FIG. 8.
  • the terminal (s) belonging to the subband region including the specific PRB (or PRB set) may provide additional information (eg, a parameter indicating a subband identifier) for distinguishing the subbands through the CFI. Can be received. Control according to the additional information (or common CFI assumption) and the time and / or frequency value (i.e., information about the time resource region and / or information about the frequency resource region) conveyed through the CFI
  • the region on which the channel is transmitted may be set independently for each subband. In other words, as shown in FIG. 8, even if the CFI is transmitted in a region where the subbands overlap, the common control region set in each subband may be set in different forms among the subbands.
  • the corresponding terminal (s) may determine the control channel region of the subband to which it belongs by using the additional information and the time and / or frequency value transmitted through the CFI.
  • Method 1-3 may be applied is as follows. It may be considered that there are terminals that have completed the initial access procedure in a specific network, and that the subbands that the terminals can monitor are smaller than the system bandwidth.
  • the network for example, a base station
  • the network may preset CFI information for each subband in advance. It may be set to transmit in a set (or promised, defined) time and / or frequency domain.
  • the terminals may receive the CFI transmitted as described above and determine a common control region (that is, a control region set in a specific subband to which the terminal belongs) to be monitored.
  • a common control region that is, a control region set in a specific subband to which the terminal belongs. Specific examples for method 1-3 are shown in FIG. 9.
  • 9 shows another example of a CFI transmission method through a preset region to which the method proposed in this specification can be applied. 9 is merely for convenience of description and does not limit the scope of the invention.
  • the black area represents the area where the CFI is transmitted (ie, the CFI area)
  • the hatched area represents the control channel area (ie, the common control area set in the corresponding subband).
  • the hatched regions of FIG. 9 may mean a sub-band specific control region that can be commonly monitored by terminals belonging to the corresponding subband.
  • the base station may transmit the CFI for each subband (through a predetermined region) within the aligned subband 902.
  • an area in which a control channel is transmitted may be set according to a time and / or frequency value transmitted through a corresponding CFI (ie, information on a time resource region and / or information on a frequency resource region).
  • the terminal (s) since the terminal (s) transmit and receive control information and / or data in the aligned subbands, the area for the control channel is set to be the same for the corresponding terminals. Can be.
  • the second method that is, a method of transmitting CFI information using a DCI transmitted through a preset CSS, will be described in detail.
  • the second method may be divided into the following three methods according to the arrangement of subbands.
  • the method includes a method for transmitting a CFI through a DCI transmitted in a specific control channel element (CCE), which has an independent common control region for every subband (method 2-1), and common control for all subbands.
  • CCE control channel element
  • This division is only for convenience of description, and the above methods may be combined and applied to each other.
  • the existence of an independent common control region for every subband may mean that a control region that can be commonly monitored by terminals allocated to each of the plurality of subbands exists in each subband.
  • the presence of a common control region for every subband may mean that a control region that can be commonly monitored by terminals allocated to each of a plurality of subbands may overlap each other.
  • the common control region may mean a common control region in which the CFI is transmitted.
  • Method 2-1 may be applied is as follows. It may be considered that there are terminals that have completed the initial access procedure in a specific network, and that the subbands that the terminals can monitor are smaller than the system bandwidth. In this case, when the subbands are allocated without overlapping each other and without empty space within the corresponding system bandwidth, the base station may be configured to transmit the CFI through DCI transmitted in a specific CCE of a common control region preset for each subband. have.
  • the terminals monitoring each subband may receive the CFI transmitted as described above and determine a common control region (that is, a control region set in a specific subband to which the terminal belongs) to be monitored.
  • a common control region that is, a control region set in a specific subband to which the terminal belongs.
  • 10 shows an example of a CFI transmission method through downlink control information (DCI) to which the method proposed in the present specification can be applied. 10 is merely for convenience of description and does not limit the scope of the invention.
  • DCI downlink control information
  • the dotted region represents the common control channel region
  • the black region represents the region where the CFI is transmitted (i.e., the CFI region)
  • the shaded region represents the control channel region (i.e. the corresponding subband).
  • the area indicated by a dot means a common control area for CFI, and may indicate an area that can be commonly monitored by terminals allocated to each of a plurality of subbands.
  • the hatched area in FIG. 10 refers to a sub-band specific control area that can be commonly monitored by terminals belonging to the corresponding subband, similarly to the hatched area shown in FIG. 7 described above. can do.
  • the base station may be configured to transmit the CFI through a DCI transmitted in a specific CCE of a preset common control region (ie, an area indicated by a dot).
  • a preset common control region ie, an area indicated by a dot.
  • an area where the control channel is transmitted that is, Hatched areas
  • the control channel region set for each subband may be set in different forms among the subbands.
  • the terminal (s) may determine the control channel region set for the subband to which it belongs by using the time and / or frequency value transmitted through the CFI.
  • Method 2-2 may be applied is as follows. It may be considered that there are terminals that have completed the initial access procedure in a specific network, and that the subbands that the terminals can monitor are smaller than the system bandwidth. In this case, when subbands existing within the corresponding system bandwidth are allocated without considering overlap and / or empty space, the CFI may be set to be transmitted through specific CCEs of one or more common control regions.
  • the subbands allocated within the corresponding system bandwidth may be set to view at least one of the preset one or more common control regions.
  • the corresponding subbands may be set to include at least one of one or more common control regions preset.
  • the one or more common control regions described above may be preset (or promised, defined) common control region (s) for a plurality of subbands, and the CFI is transmitted on a particular CCE of that common control region. Can be.
  • the CFI is configured such that the base station transmits independent CFI information (that is, information transmitted through the CFI) for each subband using additional information.
  • CFI information that is, information transmitted through the CFI
  • a sub-band ID may be used to distinguish the CFI for each subband.
  • information transmitted through the CFI may be commonly set for the subbands.
  • the terminals monitoring each subband may receive the CFI transmitted as described above, and may determine a common control region (that is, a control region set in a specific subband to which the terminal belongs) to be monitored.
  • Specific examples of Method 2-2 are shown in FIG. 11.
  • 11 shows another example of a CFI transmission method through DCI to which the method proposed in the present specification can be applied. 11 is merely for convenience of description and does not limit the scope of the present invention.
  • the fourth subband 1108 overlaps the first subband 1102 and the second subband 1104, and the fifth subband 1110 overlaps the second subband 804 and the third subband 1106. do.
  • the area indicated by the dot represents the common control channel area
  • the black area represents the area where the CFI is transmitted (i.e., the CFI area)
  • the hatched area represents the control channel area (i.e., the control area set in the corresponding subband). Indicates.
  • the area indicated by a dot means a common control area for CFI, and may indicate an area that can be commonly monitored by terminals allocated to each of a plurality of subbands.
  • the hatched area in FIG. 11 refers to a sub-band specific control area that can be commonly monitored by terminals belonging to the corresponding subband, similarly to the hatched area shown in FIG. 8 described above. can do.
  • the base station determines a specific CCE of one or more preset common control regions (ie, regions indicated by dots) as described above. (I.e., DCI transmitted in specific CCEs) may be transmitted.
  • specific CCEs of the one or more preset common control regions may refer to a black region illustrated in FIG. 11.
  • the terminal (s) belonging to the subband region including the corresponding common control region may receive additional information (eg, a parameter related to the subband identifier) for distinguishing the subbands through the CFI. .
  • additional information e.g, a parameter related to the subband identifier
  • Control according to the additional information (or common CFI assumption) and the time and / or frequency value i.e., information about the time resource region and / or information about the frequency resource region) conveyed through the CFI
  • the region in which the channel is transmitted (that is, the shaded region) may be set independently for each subband. In other words, as shown in FIG. 11, even if the CFI is transmitted in the region where the subbands overlap, the control channel region set for each subband may be set in different forms among the subbands.
  • the corresponding terminal (s) may determine the control channel region set for the subband to which it belongs by using the additional information and time and / or frequency values transmitted through the CFI. Thereafter, the corresponding terminal (s) may receive control information (ie, downlink control information) from the base station through the determined control channel region.
  • control information ie, downlink control information
  • Method 2-3 an example to which Method 2-3 can be applied is as follows. It may be considered that there are terminals that have completed the initial access procedure in a specific network, and that the subbands that the terminals can monitor are smaller than the system bandwidth.
  • the network for example, a base station
  • the network may preset CFI information for each subband in advance. It may be configured to transmit on a specific CCE of the established (or promised, defined) common control region.
  • the terminals may receive the CFI transmitted as described above and determine a common control region (that is, a control region set in a specific subband to which the terminal belongs) to be monitored. Specific examples for method 2-3 are shown in FIG. 12.
  • 12 shows another example of a CFI transmission method through DCI to which the method proposed in this specification can be applied. 12 is merely for convenience of description and does not limit the scope of the invention.
  • UEs transmit and receive control information and / or data through an aligned sub-band 1202 configured by aligning subband regions of each other.
  • the area indicated by the dot represents the common control channel area
  • the black area represents the area where the CFI is transmitted (i.e., the CFI area)
  • the hatched area represents the control channel area (i.e., the control area set in the corresponding subband).
  • the area indicated by a dot means a common control area for CFI, and may indicate an area that can be commonly monitored by terminals allocated to each of a plurality of subbands.
  • the hatched area in FIG. 12 refers to a sub-band specific control area that can be commonly monitored by terminals belonging to the corresponding subband, similarly to the hatched area shown in FIG. 9 described above. can do.
  • the base station may transmit the CFI for each subband (via a specific CCE in the common control region) within the aligned subband 1202.
  • the region where the control channel is transmitted ie, shaded region.
  • the region for the control channel may be set to be the same for the terminals belonging to the aligned subband 1202.
  • the CCE index may be set to have a specific relationship with each cell ID. In other words, CCE multiplexing based on cell identifier may be considered.
  • one of the two may be a fixed control channel region and the other may be a virtual control channel region.
  • the fixed control channel region may be set to always remain as the control region (that is, the region where control information is transmitted).
  • the virtual control channel region may be set to allow data to be transmitted when control information (that is, control channel) is not transmitted, that is, to allow multiplexing between control information and data.
  • control information that is, control channel
  • FIG. 13 A specific example of the method is shown in FIG. 13.
  • FIG. 13 shows an example of a CFI transmission method for transmitting a plurality of control region information to which the method proposed in this specification can be applied. 13 is merely for convenience of description and does not limit the scope of the present invention.
  • UEs transmit and receive control information and / or data through an aligned sub-band 1302 configured by aligning subband regions of each other.
  • the method may be applied to not only aligned subbands but also various subband arrangements such as some overlapping subbands or nonoverlapping subbands.
  • the black area is an area where CFI information is transmitted (that is, a CFI area) and may mean a specific CCE of the preset specific area or the preset common control area described above with reference to FIGS. 7 to 12.
  • the CFI delivered in the corresponding area may carry information on two control channel areas.
  • the two control channel regions may be referred to as a first control channel region and a second control channel region, respectively.
  • the first control channel region may correspond to the fixed control channel region described above
  • the second control channel region may correspond to the virtual control channel region described above.
  • control region may be variously set in the frequency axis direction and the time axis direction.
  • CCE Control Channel Element
  • channel estimation is performed using UE-specific DMRS (UE-specific DMRS) for each UE. May be considered.
  • UE-specific DMRS UE-specific DMRS
  • two-dimensional CCE allocation methods as shown in FIG. 14 may be considered.
  • 14 shows examples of a method of allocating a control channel element to which the method proposed in the present specification can be applied. 14 is merely for convenience of description and does not limit the scope of the present invention.
  • a time value (ie, time information, time allocation information, and information indicating a time resource region) transmitted through the CFI is set to two symbols.
  • the resource region is set to control regions (ie, two CCEs) for two terminals (ie, the first terminal and the second terminal), and the region 1402 is configured to configure the CCE for the first terminal.
  • Area 1404 is used for CCE setting for the second terminal.
  • the area 1406 is used for DMRS transmission for the area 1402, and the area 1408 is used for DMRS transmission for the area 1404.
  • each square shown in FIG. 14 may mean a resource element (RE) unit.
  • RE resource element
  • FIG. 14A illustrates a method of configuring a CCE for each UE in each symbol and transmitting DMRS of each UE and control information of each UE for each symbol.
  • the DMRS overhead may increase.
  • (b) of Figure 14 shows a method of using a pre-transmitted from the first DMRS symbol (1 st symbol) in the second symbol (2 nd symbol).
  • each CCE is configured with a uniform number of REs, there may be a resource area (that is, a hatched area) that cannot be allocated.
  • a resource area that is, a hatched area
  • FIG. 14C configures a CCE for each UE by using REs corresponding to half of frequency axis resources (eg, subcarriers), and DMRS for each UE is a first symbol. Only indicates how to send.
  • the DMRS density of the frequency axis is the same as compared with FIGS. 14A and 14B described above, but the number of REs directly used to transmit coded bits is greatest. There is an advantage that is set.
  • FIG. 14 For convenience of description, the methods shown in FIG. 14 have been described as being limited to an area composed of two symbols, but the method is composed of various numbers of symbols (eg, three symbols, four symbols, etc.) allocated through CFI. Of course, it can be applied to the areas.
  • the CFI ie, two-dimensional CFI
  • the number of symbols assigned on the time axis may be important.
  • the basic unit of the CCE according to the values of x, k, and M May be expressed as shown in FIG. 15.
  • 15 shows specific examples of a CCE allocation method to which the method proposed in this specification can be applied. 15 is merely for convenience of description and does not limit the scope of the present invention.
  • each CCE in a control region is configured using a specific section of frequency axis resources, and DMRS for each UE is transmitted only in the first symbol of the corresponding CCE. Is assumed.
  • each CCE is composed of three symbols on the time axis and four subcarriers on the frequency axis, and a total of four CCEs can be set in the entire control region.
  • two DMRSs are transmitted for each CCE.
  • each CCE is composed of four symbols on the time axis and nine subcarriers on the frequency axis, and a total of two CCEs can be set in the entire control region. At this time, three DMRSs are transmitted for each CCE.
  • the terminal may be configured to know in advance the default value (ie, the CFI default value) for the information transmitted through the CFI.
  • the default value may be set to a specific value such as a minimum value and / or a maximum value.
  • the terminal may be configured to receive information about a default value in advance through higher layer signaling (ie, higher layer configuration). Accordingly, when the UE fails to receive the CFI (ie, the UE determines that the CFI has failed), the UE determines the CCE position to be monitored by using the CFI default value known in advance (ie, preset). (Or identify).
  • the default control region may be set to an area corresponding to 1 symbol * center 6 RB of a specific subband preset for each terminal (or for each terminal group).
  • the default control area means an area indicated by the CFI default value.
  • the terminal may move to the default control region set as described above. Thereafter, the terminal may perform blind detection (or blind decoding) on the existence of control information (ie, DCI) transmitted for the corresponding terminal.
  • This method has the advantage of reducing the blind detection burden (that is, blind detection overhead) of the UE that has not received the CFI (exactly).
  • the base station needs to transmit control information (ie, DCI) for terminals sharing a region corresponding to the default control region, respectively.
  • the default control region may be set to an area corresponding to 3 symbols * center 12 RBs of a specific subband preset for each terminal (or for each terminal group).
  • the default control area means an area indicated by the CFI default value.
  • the terminal may move to the default control region set as described above. Thereafter, the terminal may perform blind detection on the presence or absence of control information transmitted for the corresponding terminal.
  • the method blindly detects the control information for all control areas by the terminal that has not received the CFI (exactly), and thus does not cause a delay problem and has an advantage of reducing the burden on the base station.
  • the determination criteria for the CFI reception failure may be set in the following manner. For example, when the UE does not receive the CFI transmitted every subframe, it may determine that the CFI reception has failed. In this case, it is assumed that the base station transmits the CFI every subframe.
  • the UE may determine that the CFI reception has failed.
  • the N value may be set in advance (on a standard), may be delivered semi-statically through system information, or higher layer signaling (eg RRC signaling) may be used. May be delivered semi-statically.
  • the UE when the N value is set to a specific value, the UE performs CFI discovery for the number of subframe (s) corresponding to the specific value, and if the CFI discovery fails, the increased number of subs according to a preset criterion
  • a method of performing the CFI search again for the frames may be considered. For example, when the first N value is set to 1, the UE may perform CFI discovery for one subframe and may perform CFI discovery again for two subframes when the corresponding CFI discovery fails. If the CFI search for the two subframes also fails, the UE can perform the CFI search for the three subframes again. Thereafter, when the UE succeeds in receiving the CFI, the N value may be reset to 1, which is an initial setting value.
  • FIG. 16 is a flowchart illustrating an operation of a terminal for transmitting and receiving control information to which the method proposed in the present specification can be applied. 16 is merely for convenience of description and does not limit the scope of the present invention.
  • the terminal receives information on an area (eg, the common control area described above, ie, an area that can be monitored by a terminal belonging to a corresponding subband) from a base station through CFI.
  • an area eg, the common control area described above, ie, an area that can be monitored by a terminal belonging to a corresponding subband
  • CFI is set and / or transmitted according to the above-described schemes.
  • the terminal receives information indicating a control region (eg, the common control region described above) set in a specific subband to which the terminal belongs among a plurality of subbands.
  • the information indicating the control region is indicated through a control format indicator (CFI).
  • the CFI may be the two-dimensional CFI described above
  • the information indicating the control region may be information transmitted through the two-dimensional CFI described above.
  • the information indicating the control region may include time information (eg, a time value, a time allocation value, etc.) indicating a time resource region of the control region and a frequency resource region of the control region. It includes frequency information indicating.
  • the frequency information may include information indicating a starting subcarrier of the control region.
  • the frequency information may be set in units of a subcarrier set, and the subcarrier set may include one or more subcarriers of a preset number (eg, 12). In other words, the subcarrier set may consist of one or more subcarriers.
  • the frequency information may further include information indicating the number of subcarrier sets occupying the control region.
  • the setting information for the start subcarrier of the control region may be set in units of the subcarrier set.
  • the size of the information representing the control region is determined according to the product of the number of candidates for the time resource region and the number of candidates for the frequency resource region, and the candidate for the frequency resource region.
  • the number of may be set according to the number of candidate positions of the starting subcarrier.
  • the number of candidates for the frequency resource region is a sum of integers from 1 to the number of candidate positions (eg, Can be determined by
  • the number of candidate positions may be determined according to the number of subcarriers included in the specific subband and the number of subcarriers included in the subcarrier aggregation unit.
  • time information may be indicated according to a first period
  • frequency information may be indicated according to a second period
  • second period may be set to a value greater than the first period
  • the time information may be a value belonging to any one of a plurality of sets each configured with a different combination of multiples of a slot size.
  • the CFI may be transmitted through a preset physical control format indicator channel (PCFICH) or specific downlink control information (DCI) (eg, DCI delivered through a specific CCE of the preset common control region).
  • PCFICH physical control format indicator channel
  • DCI downlink control information
  • step S1605 the terminal receives a DCI from the base station through the control area.
  • FIG. 17 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.
  • a wireless communication system includes a base station 1710 and a plurality of terminals 1720 located in an area of a base station 1710.
  • the base station 1710 includes a processor 1711, a memory 1712, and an RF unit 1713.
  • the processor 1711 implements the functions, processes, and / or methods proposed in FIGS. 1 to 16. Layers of the air interface protocol may be implemented by the processor 1711.
  • the memory 1712 is connected to the processor 1711 and stores various information for driving the processor 1711.
  • the RF unit 1713 is connected to the processor 1711 and transmits and / or receives a radio signal.
  • the terminal 1720 includes a processor 1721, a memory 1722, and an RF unit 1723.
  • the processor 1721 implements the functions, processes, and / or methods proposed in FIGS. 1 to 16. Layers of the air interface protocol may be implemented by the processor 1721.
  • the memory 1722 is connected to the processor 1721 and stores various information for driving the processor 1721.
  • the RF unit 1723 is connected to the processor 1721 to transmit and / or receive a radio signal.
  • the memories 1712 and 1722 may be inside or outside the processors 1711 and 1721, and may be connected to the processors 1711 and 1721 by various well-known means.
  • the terminal in order to transmit and receive downlink data (DL data) in a wireless communication system supporting a low latency service, the terminal is a radio frequency (RF) unit for transmitting and receiving a radio signal, and a functional unit with the RF unit. It may include a processor connected to.
  • RF radio frequency
  • the base station 1710 and / or the terminal 1720 may have a single antenna or multiple antennas.
  • FIG. 18 is a block diagram illustrating a communication device according to one embodiment of the present invention.
  • FIG. 18 illustrates the terminal of FIG. 17 in more detail.
  • a terminal may include a processor (or a digital signal processor (DSP) 1810, an RF module (or RF unit) 1835, and a power management module 1805). ), Antenna 1840, battery 1855, display 1815, keypad 1820, memory 1830, SIM card (SIM (Subscriber Identification Module) card) 1825 (this configuration is optional), a speaker 1845, and a microphone 1850.
  • the terminal may also include a single antenna or multiple antennas. Can be.
  • the processor 1810 implements the functions, processes, and / or methods proposed in FIGS. 1 to 16.
  • the layer of the air interface protocol may be implemented by the processor 1810.
  • the memory 1830 is connected to the processor 1810 and stores information related to the operation of the processor 1810.
  • the memory 1830 may be inside or outside the processor 1810 and may be connected to the processor 1810 by various well-known means.
  • the user enters command information such as a telephone number, for example, by pressing (or touching) a button on keypad 1820 or by voice activation using microphone 1850.
  • the processor 1810 receives the command information, processes the telephone number, and performs a proper function. Operational data may be extracted from the SIM card 1825 or the memory 1830. In addition, the processor 1810 may display command information or driving information on the display 1815 for user recognition and convenience.
  • the RF module 1835 is coupled to the processor 1810 to transmit and / or receive RF signals.
  • the processor 1810 communicates command information to the RF module 1835 to initiate, for example, a radio signal constituting voice communication data.
  • the RF module 1835 is composed of a receiver and a transmitter for receiving and transmitting a radio signal.
  • the antenna 1840 functions to transmit and receive wireless signals. Upon receiving the wireless signal, the RF module 1835 may forward the signal and convert the signal to baseband for processing by the processor 1810. The processed signal may be converted into audible or readable information output through the speaker 1845.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code may be stored in memory and driven by the processor.
  • the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the method of transmitting and receiving control information in the wireless communication system of the present invention has been described with reference to the example applied to the 3GPP LTE / LTE-A system and the 5G system (New RAT system), but can be applied to various wireless communication systems. .

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

Abstract

L'invention concerne un procédé permettant de transmettre et de recevoir des informations de commande dans un système de communication sans fil, et un appareil correspondant. Spécifiquement, le procédé pour un terminal lui permettant de transmettre et de recevoir des informations de commande comprend les étapes suivantes : recevoir, en provenance d'une station de base, des informations indiquant une région de commande configurée dans une sous-bande particulière à laquelle le terminal appartient parmi une pluralité de sous-bandes ; et recevoir, en provenance de la station de base, des informations de commande de liaison descendante au moyen de la région de commande, les informations indiquant la région de commande étant indiquées par un indicateur de format de commande (CFI), et pouvant comprendre des informations de temps indiquant une région de ressource de temps de la région de commande, et des informations de fréquence indiquant une région de ressource de fréquence de cette dernière.
PCT/KR2017/010807 2016-09-29 2017-09-28 Procédé permettant de transmettre et de recevoir des informations de commande dans un système de communication sans fil, et appareil correspondant WO2018062890A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US201662401883P 2016-09-29 2016-09-29
US62/401,883 2016-09-29
US201662417322P 2016-11-04 2016-11-04
US201662418157P 2016-11-04 2016-11-04
US62/417,322 2016-11-04
US62/418,157 2016-11-04

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WO2018062890A1 true WO2018062890A1 (fr) 2018-04-05

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Citations (4)

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US20130121317A1 (en) * 2011-11-16 2013-05-16 Electronics And Telecommunications Research Institute Machine type communication support method and apparatus
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US20140153539A1 (en) * 2011-07-14 2014-06-05 Lg Electronics Inc. Method and device for setting a control channel and a data channel in a wireless communication system
US20130121317A1 (en) * 2011-11-16 2013-05-16 Electronics And Telecommunications Research Institute Machine type communication support method and apparatus
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