WO2017119794A1 - Procédé de notification d'informations d'état de canal, et équipement d'utilisateur l'exécutant - Google Patents

Procédé de notification d'informations d'état de canal, et équipement d'utilisateur l'exécutant Download PDF

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Publication number
WO2017119794A1
WO2017119794A1 PCT/KR2017/000248 KR2017000248W WO2017119794A1 WO 2017119794 A1 WO2017119794 A1 WO 2017119794A1 KR 2017000248 W KR2017000248 W KR 2017000248W WO 2017119794 A1 WO2017119794 A1 WO 2017119794A1
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Prior art keywords
channel state
state information
measurement
tti
reference signal
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PCT/KR2017/000248
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English (en)
Korean (ko)
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황대성
이승민
이윤정
김선욱
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • 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
    • H04W72/12—Wireless traffic scheduling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to mobile communications.
  • 3GPP LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • LTE is divided into a frequency division duplex (FDD) scheme and a time division duplex (TDD) scheme.
  • FDD frequency division duplex
  • TDD time division duplex
  • the physical channel in LTE is a downlink channel PDSCH (Physical Downlink) It may be divided into a shared channel (PDCCH), a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) which are uplink channels.
  • PDSCH Physical Downlink
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • TTIs transmission time intervals
  • the TTI used for transmission of a physical channel such as PDSCH, PUSCH, or PUCCH may be set smaller than 1 millisecond (msec).
  • TTIs for a plurality of physical channels existing in one subframe may be different.
  • the present disclosure aims to solve the above-mentioned problem.
  • one disclosure of the present specification provides a method for reporting channel state information by a user equipment (UE).
  • the method includes receiving a subframe comprising a reference signal for measuring the channel state information; Dividing the subframe into a plurality of measurement sets for performing the measurement of the channel state information; Measuring the channel state information based on each of the plurality of measurement sets; And transmitting the measured channel state information.
  • the measurement set may have the same size as a transmission time interval (TTI) for transmitting a downlink data channel or an uplink data channel.
  • TTI transmission time interval
  • the measurement set may be configured according to a unit set based on one or more symbols.
  • the dividing of the plurality of measurement sets into a plurality of measurement sets based on a TTI having a size smaller than 1 millisecond is set based on a transmission time interval (TTI) of 1 millisecond in order to measure the channel state information.
  • TTI transmission time interval
  • Can be divided into The plurality of measurement sets may be divided into a first measurement set consisting of symbols including the reference signal and a second measurement set consisting of symbols not including the reference signal.
  • the channel state information is measured based on the first measurement set consisting of the symbols including the reference signal, and based on the second measurement set consisting of symbols not including the reference signal.
  • Channel state information may not be measured.
  • the first channel state information measured based on the first measurement set made up of symbols including the reference signal and the second measurement set made up of symbols not including the reference signal are measured.
  • the second channel state information may be classified and transmitted.
  • the wireless device may include a radio frequency (RF) unit for transmitting and receiving a radio signal and a processor controlling the RF unit.
  • the processor controls the RF unit to receive a subframe including a reference signal for measuring the channel state information; Divide the subframe into a plurality of measurement sets for performing the measurement of the channel state information; Measure the channel state information based on each of the plurality of measurement sets; And controlling the RF unit to perform the procedure of transmitting the measured channel state information.
  • RF radio frequency
  • 1 is a wireless communication system.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • 3 shows a structure of a downlink radio frame according to TDD in 3GPP LTE.
  • FIG. 4 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
  • 5 shows a structure of a downlink subframe.
  • FIG. 6 shows a structure of an uplink subframe in 3GPP LTE.
  • FIG. 7 is a comparative example of a single carrier system and a carrier aggregation system.
  • FIG. 8 illustrates cross-carrier scheduling in a carrier aggregation system.
  • FIG. 9 illustrates an example of a CSI measurement subset according to one disclosure herein.
  • FIG. 10 is a flowchart illustrating a method of reporting channel state information according to one disclosure of the present specification.
  • FIG. 11 is a block diagram illustrating a wireless communication system in which the present disclosure is implemented.
  • LTE includes LTE and / or LTE-A.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • base station which is used hereinafter, generally refers to a fixed station for communicating with a wireless device, and includes an evolved-nodeb (eNodeB), an evolved-nodeb (eNB), a base transceiver system (BTS), and an access point (e. Access Point) may be called.
  • eNodeB evolved-nodeb
  • eNB evolved-nodeb
  • BTS base transceiver system
  • access point e. Access Point
  • UE User Equipment
  • UE User Equipment
  • SS Subscriber Station
  • MT Mobile Terminal
  • 1 is a wireless communication system.
  • a wireless communication system includes at least one base station (BS) 20.
  • Each base station 20 provides a communication service for a particular geographic area (generally called a cell) 20a, 20b, 20c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the UE typically belongs to one cell, and the cell to which the UE belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are determined relatively based on the UE.
  • downlink means communication from the base station 20 to the UE 10
  • uplink means communication from the UE 10 to the base station 20.
  • the transmitter may be part of the base station 20 and the receiver may be part of the UE 10.
  • the transmitter may be part of the UE 10 and the receiver may be part of the base station 20.
  • the wireless communication system includes a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MIS) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
  • MIMO multiple-input multiple-output
  • MIS multiple-input single-output
  • SISO single-input single-output
  • SIMO single-input multiple-output
  • the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
  • the MISO system uses multiple transmit antennas and one receive antenna.
  • the SISO system uses one transmit antenna and one receive antenna.
  • the SIMO system uses one transmit antenna and multiple receive antennas.
  • the transmit antenna means a physical or logical antenna used to transmit one signal or stream
  • the receive antenna means a physical or logical antenna used to receive one signal or stream.
  • a wireless communication system can be largely divided into a frequency division duplex (FDD) scheme and a time division duplex (TDD) scheme.
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
  • the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
  • the downlink transmission by the base station and the uplink transmission by the UE cannot be performed at the same time.
  • uplink transmission and downlink transmission are performed in different subframes.
  • the radio frame illustrated in FIG. 2 may refer to section 5 of 3GPP TS 36.211 V10.4.0 (2011-12) "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10)".
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • Physical Channels and Modulation Release 10
  • a radio frame includes 10 subframes, and one subframe includes two slots. Slots in a radio frame are numbered from 0 to 19 slots.
  • the time taken for one subframe to be transmitted is called a Transmission Time Interval (TTI).
  • TTI may be referred to as a scheduling unit for data transmission.
  • one radio frame may have a length of 10 ms
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
  • one slot may include a plurality of OFDM symbols. How many OFDM symbols are included in one slot may vary depending on a cyclic prefix (CP).
  • CP cyclic prefix
  • 3 shows a structure of a downlink radio frame according to TDD in 3GPP LTE.
  • the radio frame includes 10 subframes indexed from 0 to 9.
  • One subframe includes two consecutive slots.
  • one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • One slot may include a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain.
  • OFDM symbol is only for representing one symbol period in the time domain, since 3GPP LTE uses Orthogonal Frequency Division Multiple Access (OFDMA) in downlink (DL), multiple access scheme or name There is no limit on.
  • OFDM symbol may be called by another name such as a single carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, or the like.
  • SC-FDMA single carrier-frequency division multiple access
  • One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of the CP.
  • One slot in a normal CP includes 7 OFDM symbols and one slot in an extended CP includes 6 OFDM symbols.
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
  • a subframe having indexes # 1 and # 6 is called a special subframe and includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization or channel estimation at the UE.
  • UpPTS is used to synchronize channel estimation at the base station with uplink transmission synchronization of the UE.
  • GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • a DL (DownLink) subframe and an UL (UpLink) subframe coexist in one radio frame.
  • Table 1 shows an example of configuration of a radio frame.
  • 'D' represents a DL subframe
  • 'U' represents a UL subframe
  • 'S' represents a special subframe.
  • the UE may know which subframe is the DL subframe or the UL subframe according to the configuration of the radio frame.
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • PDCCH and other control channels are allocated to the control region, and PDSCH is allocated to the data region.
  • 4 is 3GPP In LTE An example diagram illustrating a resource grid for one uplink or downlink slot.
  • the UL slot includes a time domain includes a plurality of OFDM symbols in a (time domain), and a frequency domain (frequency domain) N RB resource blocks (RB) in the.
  • N RB resource blocks For example, in the LTE system, the number of resource blocks (RBs), that is, N RBs may be any one of 6 to 110.
  • the RB is also called a physical resource block (PRB).
  • one resource block RB includes 7x12 resource elements RE including 7 OFDM symbols in a time domain and 12 subcarriers in a frequency domain, but the number of subcarriers in a resource block is exemplarily described.
  • the number of OFDM symbols is not limited thereto.
  • the number of OFDM symbols or the number of subcarriers included in the resource block may be variously changed. That is, the number of OFDM symbols may change according to the length of the above-described CP.
  • 3GPP LTE defines that 7 OFDM symbols are included in one slot in the case of a regular CP, and 6 OFDM symbols in one slot in the case of an extended CP.
  • the OFDM symbol is for representing one symbol period, and may be referred to as an SC-FDMA symbol, an OFDMA symbol, or a symbol period according to a system.
  • the RB includes a plurality of subcarriers in the frequency domain in resource allocation units.
  • the number N UL of resource blocks included in an uplink slot depends on an uplink transmission bandwidth set in a cell.
  • Each element on the resource grid is called a resource element (RE).
  • the number of subcarriers in one OFDM symbol can be used to select one of 128, 256, 512, 1024, 1536 and 2048.
  • a resource grid for one uplink slot may be applied to a resource grid for a downlink slot.
  • 5 shows a structure of a downlink subframe.
  • 7 OFDM symbols are included in one slot by assuming a normal CP.
  • the number of OFDM symbols included in one slot may change according to the length of a cyclic prefix (CP). That is, as described above, according to 3GPP TS 36.211 V10.4.0, one slot includes 7 OFDM symbols in a normal CP, and one slot includes 6 OFDM symbols in an extended CP.
  • CP cyclic prefix
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
  • PDCH physical downlink control channel
  • physical channels include a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid (PHICH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PDCCH physical downlink control channel
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid
  • ARQ Indicator Channel Physical Uplink Control Channel
  • the PCFICH transmitted in the first OFDM symbol of the subframe carries a Control Format Indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
  • CFI Control Format Indicator
  • the wireless device first receives the CFI on the PCFICH and then monitors the PDCCH.
  • the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.
  • PHICH carries a positive-ACKnowledgement (ACK) / Negative-ACKnowledgement (NACK) signal for UL HARQ (Hybrid Automatic Repeat reQuest).
  • ACK positive-ACKnowledgement
  • NACK Negative-ACKnowledgement
  • the ACK / NACK signal for the UL data on the PUSCH transmitted by the wireless device is transmitted on the PHICH.
  • the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame.
  • the PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
  • MIB master information block
  • SIB system information block
  • the PDCCH includes resource allocation and transmission format of downlink-shared channel (DL-SCH), resource allocation information of uplink shared channel (UL-SCH), paging information on PCH, system information on DL-SCH, and random access transmitted on PDSCH. Resource allocation of higher layer control messages such as responses, sets of transmit power control commands for individual UEs in any UE group, activation of Voice over Internet Protocol (VoIP), and the like.
  • a plurality of PDCCHs may be transmitted in the control region, and the UE may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or several consecutive CCEs.
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the C
  • DCI downlink control information
  • PDSCH also called DL grant
  • PUSCH resource allocation also called UL uplink grant
  • VoIP Voice over Internet Protocol
  • the base station determines the PDCCH format according to the DCI to be sent to the UE, and attaches a CRC (Cyclic Redundancy Check) to the control information.
  • the CRC masks a unique Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific UE, a unique identifier of the UE, for example, a C-RNTI (Cell-RNTI), may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, P-RNTI (P-RNTI), may be masked to the CRC.
  • P-RNTI P-RNTI
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • blind decoding is used to detect the PDCCH.
  • Blind decoding is a method of demasking a desired identifier in a cyclic redundancy check (CRC) of a received PDCCH (referred to as a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
  • the base station determines the PDCCH format according to the DCI to be sent to the wireless device, attaches the CRC to the DCI, and masks a unique identifier (RNTI) to the CRC according to the owner or purpose of the PDCCH.
  • RNTI unique identifier
  • the control region in the subframe includes a plurality of control channel elements (CCEs).
  • the CCE is a logical allocation unit used to provide a coding rate according to the state of a radio channel to a PDCCH and corresponds to a plurality of resource element groups (REGs).
  • the REG includes a plurality of resource elements RE.
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • One REG includes four REs and one CCE includes nine REGs.
  • ⁇ 1, 2, 4, 8 ⁇ CCEs may be used to configure one PDCCH, and each element of ⁇ 1, 2, 4, 8 ⁇ is called a CCE aggregation level.
  • the number of CCEs used for transmission of the PDCCH is determined by the base station according to the channel state. For example, one CCE may be used for PDCCH transmission for a UE having a good downlink channel state. Eight CCEs may be used for PDCCH transmission for a UE having a poor downlink channel state.
  • a control channel composed of one or more CCEs performs interleaving in units of REGs and is mapped to physical resources after a cyclic shift based on a cell identifier is performed.
  • the UE cannot know which CCE aggregation level or DCI format is transmitted at which position in the PDCCH of the control region. Since a plurality of PDCCHs may be transmitted in one subframe, the UE monitors the plurality of PDCCHs in every subframe. Here, monitoring means that the UE attempts to decode the PDCCH according to the PDCCH format.
  • a search space is used to reduce the burden of blind decoding.
  • the search space may be referred to as a monitoring set of the CCE for the PDCCH.
  • the UE monitors the PDCCH in the corresponding search space.
  • a DCI format and a search space to be monitored are determined according to a transmission mode (TM) of the PDSCH.
  • TM transmission mode
  • Transmission mode DCI format Search space PDSCH Transmission Mode According to PDCCH Transfer mode 1 DCI format 1A Public and terminal specific Single antenna port, port 0 DCI format 1 Terminal specific Single antenna port, port 0 Transfer mode 2 DCI format 1A Public and terminal specific Transmit diversity DCI format 1 Terminal specific Transmission diversity Transmission mode 3 DCI format 1A Public and terminal specific Transmission diversity DCI format 2A Terminal specific Cyclic Delay Diversity (CDD) or Transmit Diversity Transmission mode 4 DCI format 1A Public and terminal specific Transmission diversity DCI format 2 Terminal specific Closed-loop spatial multiplexing Transmission mode 5 DCI format 1A Public and terminal specific Transmission diversity DCI format 1D Terminal specific Multi-user Multiple Input Multiple Output (MU-MIMO) Transmission mode 6 DCI format 1A Public and terminal specific Transmission diversity DCI format 1B Terminal specific Closed Loop Space Multiplexing Transmission mode 7 DCI format 1A Public and terminal specific Single antenna port, port 0, or transmit diversity if the number of PBCH transmit ports is 1 DCI format 1 Terminal specific Single antenna port, port 5 Transmission mode 8 DCI format 1A Public
  • the uses of the DCI format are classified as shown in the following table.
  • DCI format Contents DCI format 0 Used for PUSCH scheduling DCI format 1 Used for scheduling one PDSCH codeword DCI format 1A Used for compact scheduling and random access of one PDSCH codeword DCI format 1B Used for simple scheduling of one PDSCH codeword with precoding information DCI format 1C Used for very compact scheduling of one PDSCH codeword DCI format 1D Used for simple scheduling of one PDSCH codeword with precoding and power offset information DCI format 2 Used for PDSCH scheduling of terminals configured in closed loop spatial multiplexing mode DCI format 2A Used for PDSCH scheduling of terminals configured in an open-loop spatial multiplexing mode DCI format 2B DCI format 2B is used for resource allocation for dual-layer beamforming of the PDSCH.
  • DCI format 2C DCI format 2C is used for resource allocation for up to eight layers of closed-loop SU-MIMO or MU-MIMO operation.
  • DCI format 2D DCI format 2C is used for resource allocation of up to eight layers.
  • DCI format 3 Used to transmit TPC commands of PUCCH and PUSCH with 2-bit power adjustments
  • DCI format 3A Used to transmit TPC commands of PUCCH and PUSCH with 1-bit power adjustment
  • DCI format 4 Used for PUSCH scheduling of uplink (UL) cell operating in multi-antenna port transmission mode
  • the uplink channel includes a PUSCH, a PUCCH, a sounding reference signal (SRS), and a physical random access channel (PRACH).
  • PUSCH PUSCH
  • PUCCH Physical Uplink Control Channel
  • SRS sounding reference signal
  • PRACH physical random access channel
  • the PDCCH is monitored in a limited region called a control region in a subframe, and the CRS transmitted in all bands is used for demodulation of the PDCCH.
  • the type of control information is diversified and the amount of control information is increased, the scheduling flexibility is inferior to the existing PDCCH alone.
  • EPDCCH enhanced PDCCH
  • FIG. 6 shows a structure of an uplink subframe in 3GPP LTE.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region.
  • the data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted).
  • PUSCH Physical Uplink Shared Channel
  • PUCCH for one UE is allocated to an RB pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of a first slot and a second slot.
  • the frequency occupied by RBs belonging to the RB pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • the UE may obtain frequency diversity gain by transmitting uplink control information through different subcarriers over time.
  • m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe.
  • the uplink control information transmitted on the PUCCH includes HARQ (Hybrid Automatic Repeat reQuest) ACK (Non-ACKnowledgement) / NACK (Non-ACKnowledgement), Channel Quality Indicator (CQI) indicating the downlink channel state, SR which is an uplink radio resource allocation request. (Scheduling Request).
  • HARQ Hybrid Automatic Repeat reQuest
  • ACK Non-ACKnowledgement
  • NACK Non-ACKnowledgement
  • CQI Channel Quality Indicator
  • the PUSCH is mapped to the UL-SCH, which is a transport channel.
  • the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the transmission time interval (TTI).
  • the transport block may be user information.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be a multiplexed transport block and control information for the UL-SCH.
  • CA Carrier Aggregation
  • FIG. 7 is a comparative example of a single carrier system and a carrier aggregation system.
  • a single carrier in uplink and downlink.
  • the bandwidth of the carrier may vary, but only one carrier is allocated to the UE.
  • a carrier aggregation (CA) system a plurality of component carriers (DL CC A to C, UL CC A to C) can be allocated to the UE.
  • Component Carrier (CC) refers to a carrier used in a carrier aggregation system and may be abbreviated as a carrier. For example, three 20 MHz component carriers may be allocated to allocate a 60 MHz bandwidth to the UE.
  • the carrier aggregation system may be divided into a contiguous carrier aggregation system in which aggregated carriers are continuous and a non-contiguous carrier aggregation system in which aggregated carriers are separated from each other.
  • a carrier aggregation system simply referred to as a carrier aggregation system, it should be understood to include both the case where the component carrier is continuous and the case where it is discontinuous.
  • the number of component carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
  • the target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
  • the 3GPP LTE system supports bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, and the 3GPP LTE-A system may configure a bandwidth of 20 MHz or more using only the bandwidth of the 3GPP LTE system.
  • broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
  • the system frequency band of a wireless communication system is divided into a plurality of carrier frequencies.
  • the carrier frequency means a center frequency of a cell.
  • a cell may mean a downlink frequency resource and an uplink frequency resource.
  • the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource.
  • CA carrier aggregation
  • the UE In order to transmit and receive packet data through a specific cell, the UE must first complete configuration for a specific cell.
  • the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed.
  • configuration is a general process of receiving common physical layer parameters required for data transmission or reception, media access control (MAC) layer parameters, or parameters required for a specific operation in a radio resource control (RRC) layer. It may include.
  • RRC radio resource control
  • the cell in the configuration complete state may exist in an activation or deactivation state.
  • activation means that data is transmitted or received or is in a ready state.
  • the UE may monitor or receive the control channel (PDCCH) and the data channel (PDSCH) of the activated cell in order to identify resources allocated to the UE (which may be frequency, time, etc.).
  • PDCCH control channel
  • PDSCH data channel
  • Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
  • the UE may receive system information (SI) required for packet reception from the deactivated cell.
  • SI system information
  • the UE does not monitor or receive the control channel (PDCCH) and the data channel (PDSCH) of the deactivated cell in order to check resources allocated to it (may be frequency, time, etc.).
  • the cell may be divided into a primary cell, a secondary cell, and a serving cell.
  • a primary cell means a cell operating at a primary frequency, and is a cell in which a UE performs an initial connection establishment procedure or a connection reestablishment procedure with a base station, or is indicated as a primary cell in a handover process. It means a cell.
  • the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
  • the serving cell is configured as a primary cell when the carrier aggregation is not set or the UE cannot provide carrier aggregation.
  • the term serving cell indicates a cell configured for the UE and may be configured in plural.
  • One serving cell may be configured with one downlink component carrier or a pair of ⁇ downlink component carrier, uplink component carrier ⁇ .
  • the plurality of serving cells may be configured as a set consisting of one or a plurality of primary cells and all secondary cells.
  • a plurality of CCs that is, a plurality of serving cells, may be supported.
  • Such a carrier aggregation system may support cross-carrier scheduling.
  • Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or other components other than the component carrier basically linked with the specific component carrier.
  • a scheduling method for resource allocation of a PUSCH transmitted through a carrier That is, the PDCCH and the PDSCH may be transmitted through different downlink CCs, and the PUSCH may be transmitted through another uplink CC other than the uplink CC linked with the downlink CC through which the PDCCH including the UL grant is transmitted. .
  • a carrier indicator indicating a DL CC / UL CC through which a PDSCH / PUSCH for which PDCCH provides control information is transmitted is required.
  • a field containing such a carrier indicator is hereinafter referred to as a carrier indication field (CIF).
  • a carrier aggregation system supporting cross carrier scheduling may include a carrier indication field (CIF) in a conventional downlink control information (DCI) format.
  • CIF carrier indication field
  • DCI downlink control information
  • 3 bits may be extended, and the PDCCH structure may include an existing coding method, Resource allocation methods (ie, CCE-based resource mapping) can be reused.
  • FIG. 8 illustrates cross-carrier scheduling in a carrier aggregation system.
  • the base station may set a PDCCH monitoring DL CC (monitoring CC) set.
  • the PDCCH monitoring DL CC set is composed of some DL CCs among the aggregated DL CCs, and when cross-carrier scheduling is set, the UE performs PDCCH monitoring / decoding only for the DL CCs included in the PDCCH monitoring DL CC set. In other words, the base station transmits the PDCCH for the PDSCH / PUSCH to be scheduled only through the DL CC included in the PDCCH monitoring DL CC set.
  • PDCCH monitoring DL CC set may be set UE-specific, UE group-specific, or cell-specific.
  • three DL CCs (DL CC A, DL CC B, and DL CC C) are aggregated, and DL CC A is set to PDCCH monitoring DL CC.
  • the UE may receive the DL grant for the PDSCH of the DL CC A, the DL CC B, and the DL CC C through the PDCCH of the DL CC A.
  • the DCI transmitted through the PDCCH of the DL CC A may include the CIF to indicate which DCI the DLI is.
  • TTIs transmission time intervals
  • a TTI used for transmission of a physical channel such as PDSCH, PUSCH, or PUCCH may be set to less than 1 msec.
  • TTIs for a plurality of physical channels existing in one subframe may be different.
  • One disclosure of the present specification controls downlink transmission power when a transmission power is greatly changed within a specific short period (eg, one subframe) in transmitting a physical channel using a reduced or extended TTI. Or we propose a scheme for scheduling. In addition, another disclosure of the present specification proposes methods for performing and configuring channel state information (CSI) measurement and radio resource management (RRM) measurement in transmitting a physical channel using a reduced or extended TTI.
  • CSI channel state information
  • RRM radio resource management
  • a TTI of a size (1 msec) of a general subframe is referred to as a normal TTI, and a TTI smaller than the size of a general subframe is referred to as a shortened TTI.
  • a reduced TTI the TTI size of a general subframe
  • an extended TTI an extended TTI
  • interference factors affecting the CSI measurement may be classified into reference signals of neighboring cells and data transmission of neighboring cells. More specifically, interference by a reference signal of a neighboring cell may be due to transmission of a reference signal such as a cell-specific reference signal (CRS) or a channel state information-reference signal (CSI-RS). As such, the reference signal may be independently transmitted with or without data transmission. Alternatively, the interference caused by data transmission of the neighbor cell may vary according to the scheduling situation of the neighbor cell.
  • a reference signal such as a cell-specific reference signal (CRS) or a channel state information-reference signal (CSI-RS).
  • CRS cell-specific reference signal
  • CSI-RS channel state information-reference signal
  • the interference caused by data transmission of the neighbor cell may vary according to the scheduling situation of the neighbor cell.
  • the influence of interference may be different for each OFDM or SC-FDMA symbol included in the TTI. More specifically, in the case of the CRS, it is transmitted at symbol indexes # 0, # 4, # 7 and # 11 within the normal TTI based on two antenna ports. In this case, among the reduced TTIs, there may be a TTI including a corresponding symbol index (that is, symbol indexes # 0, # 4, # 7, and # 11), and a TTI including no symbol index. In addition, depending on the traffic environment, the degree of interference may vary greatly between the reduced TTI including the symbol index for the CRS and the reduced TTI without the symbol index for the CRS. Therefore, in order to perform more efficient scheduling, in performing CSI measurement and reporting, it is necessary to distinguish a reduced TTI including a symbol index for a CRS from a reduced TTI including a symbol index for a CRS.
  • the above-described situation may be effective when the time synchronization between cells coincide with the predetermined level or more. Therefore, in the case of the TDD scheme, it is required to distinguish the above-described reduced TTI.
  • the above description has been made using the CRS as an example, the same may be applied to other reference signals other than the CRS.
  • the unit of the CSI measurement set may be a symbol or a group unit of symbols.
  • the unit of the CSI measurement set may be a TTI unit.
  • the TTI serving as a unit of the CSI measurement set may be a TTI for transmitting a PDSCH or a PUSCH or a third TTI configured for measurement purposes.
  • a detailed example of a method of setting a CSI measurement set for a reduced TTI is as follows.
  • Method 1 Set a CSI measurement subset for the reduced TTI for each CSI measurement set based on the normal TTI.
  • the setting for the CSI measurement subset for the reduced TTI may be specified by selection for symbol index, symbol group index, TTI or TTI group in the CSI measurement set of normal TTI criteria.
  • the TTI for setting the CSI measurement subset may be a TTI for transmitting the PDSCH or the PUSCH or a third TTI set for the measurement purpose.
  • the setting for the CSI measurement subset for the accumulated TTI may be set by a high layer.
  • FIG. 9 illustrates an example of a CSI measurement subset according to one disclosure herein.
  • the CSI measurement set of the normal TTI reference may consist of two CSI measurement subsets.
  • the present invention is not limited thereto, and the CSI measurement set of the normal TTI reference may be configured with three or more CSI measurement subsets.
  • Method 2 No additional measurement set is introduced other than the normal TTI reference CSI measurement set. Instead, the area constituting the CSI measurement set may be set in smaller units than subframes.
  • the CSI measurement set of a unit smaller than the subframe may be set by a symbol index, a symbol group index, a TTI, or a TTI group.
  • Method 3 Similar to Method 1, set the CSI measurement subset for the reduced TTI per CSI measurement set for normal TTI criteria. However, unlike Method 1, the CSI measurement subset for the reduced TTI is divided into a group of symbols that include a particular reference signal and a group of symbols that do not include the particular reference signal. As such, the setting for the CSI measurement subset may be set to always be used when using the reduced TTI, or may be set through higher layer signals as needed.
  • the reference signal for identifying the CSI measurement subset may include one or more of CRS and CSI-RS. Alternatively, the reference signal for identifying the CSI measurement subset may be limited to include only cell-specific reference signals.
  • the CSI measurement may be performed in the reduced TTI not including the symbol index for the CRS. It may be performed by using a reference signal of.
  • CSI measurements for reduced TTIs perform CSI measurements only on TTIs that contain a particular reference signal (eg, CRS or CSI-RS), and CSI on TTIs that do not include the particular reference signal. The measurement may not be performed.
  • the Modulation and Coding Scheme MCS may be set according to the CSI measurement result for the TTI including the specific reference signal.
  • the RRM measurement may include information on Reference Signal Received Power (RSRP), information on Received Signal Strength Indication (RSSI), and information on Reference Signal Received Quality (RSRQ).
  • RSRP Reference Signal Received Power
  • RSSI Received Signal Strength Indication
  • RSSI Reference Signal Received Quality
  • RSSI Received Quality
  • RSSI Reference Signal Received Quality
  • the use of a reduced TTI has led to the presence of a TTI that does not include the specific reference signal (eg, CRS).
  • the specific reference signal eg, CRS
  • SINR signal-to-interference-plus-noise ratio
  • the interference in the symbol region including the specific reference signal is above a certain level. Determination of communication interruption, such as link failure, may be made.
  • the symbol does not include the specific reference signal. It is also necessary to measure RSRQ, RSSI, and the like. More specifically, when configured to use a reduced TTI, the RSRQ and RSSI can always be measured for all symbols in a subframe or within a particular interval.
  • the specific section may be composed of one or a plurality of TTIs.
  • a subframe or symbol to be measured may be set to be periodically generated.
  • designation of a subframe for RRM measurement may be designated by indicating a TTI for RRM measurement when a reduced TTI is set.
  • a new higher layer signaling may be introduced to additionally indicate the TTI in the subframe upon setting the reduced TTI.
  • the measurement unit of the RRM measurement may be changed to a specific TTI in the subframe.
  • the TTI which is a measurement unit of the RRM measurement
  • the TTI which is a measurement unit of the RRM measurement
  • the TTI which is a measurement unit of the RRM measurement
  • RRM measurement may be performed according to the size of the TTI.
  • the RRM measurement may be performed according to the size of a TTI previously designated as a default value or the same size as the TTI set for a specific physical channel.
  • the measurement unit of the RRM measurement when the measurement unit of the RRM measurement is changed to a specific TTI in the subframe, a case where the first TTI includes the CRS and the second TTI does not include the CRS according to the setting value of the TTI size may occur. have. Therefore, when performing the RRM measurement in units of TTI, it may be limited to perform the RRM measurement only in the first TTI including the CRS. In addition, the RRM measurement may not be performed in the second TTI not including the CRS. For example, even when RSSI measurement is performed without distinguishing between a symbol including CRS and a symbol without CRS, RSSI measurement may be performed only on symbols belonging to a first TTI including CRS. As such, the method of performing the RRM measurement only for the first TTI including the CRS may increase the effect according to the RSRP measurement.
  • the base station may support a plurality of UEs, and data for each UE (eg, PDSCH) may be different frequency resources (eg, resource blocks) and / or different time resources (eg, subframes). ) May be mapped and transmitted.
  • the above-described time resource may be subdivided into a symbol or a symbol group in a subframe. Accordingly, data transmission for a plurality of UEs may be time division multiplexing (TDM) rather than frequency division multiplexing (FDM) in one subframe.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • Downlink power allocation is set to a combination of cell-specific parameters and UE-specific parameters so that downlink power for each UE may be set differently. Depending on the environment of the wireless communication channel for the UE, the required downlink power may vary. Therefore, the base station can adjust the overall downlink transmission power over time.
  • a transition time may be required.
  • distortion may occur in some or all of the signals received by the UE during the transition time. As the proportion of the area where the distortion has occurred increases, the UE may have difficulty in detecting data.
  • the area in which the distortion occurs occupies may be larger than in the case in which the normal TTI is used, it is necessary to handle the area in which the distortion occurs.
  • the base station may determine two times within one OFDM symbol constituting the reduced TTI. May have a transition time. Therefore, even if there are many frequency resources (that is, resource blocks) constituting the reduced TTI, when the distortion is severe, the efficiency of transmission is inevitably low.
  • a gap for power transition between the reduced TTI transmissions may be set.
  • a detailed example of a method for setting a gap for power transition is as follows.
  • a gap may be set by limiting scheduling for a specific transmission TTI.
  • the base station may not schedule at all during the TTI set to the gap, and may selectively schedule only some UEs in consideration of DL required power.
  • the gap region may be set between the reduced TTIs in the subframe.
  • the gap region may be set smaller than the TTI for the PDSCH or the PUSCH.
  • the size of the gap region may be set in advance or may be set by a higher layer.
  • the unit of the gap area size may be a symbol unit or a symbol group unit.
  • the gap area may be an area secured by reducing a part of the CP of one or a plurality of symbols.
  • Whether to use a gap between the TTIs may be determined based on a downlink power allocation parameter or may be determined by a higher layer.
  • whether to use the gap between the TTI may be determined through the DCI. Specifically, when setting the use of the gap between the TTI through the DCI, it is possible to set the gap immediately before the transmission in the next TTI.
  • a subframe may be allocated to a specific UE in advance by a base station through a third DCI.
  • downlink power allocation for corresponding UEs may be set to a similar level. More specifically, the UE-specific parameter for downlink power allocated in the same subframe may be equally applied to all UEs for the corresponding subframe. In this case, a specific UE may be applied with other UE-specific parameters that are different from the originally assigned UE-specific parameters.
  • the UE-specific parameter to be commonly used in the subframe may correspond to the highest value or the highest value.
  • FIG. 10 is a flowchart illustrating a method of reporting channel state information according to one disclosure of the present specification.
  • the UE receives a subframe including a reference signal RS for measuring CSI from a base station (S100).
  • the UE divides the received subframe into a plurality of measurement sets for measuring CSI (S200).
  • the UE measures the CSI based on each of the divided plurality of measurement sets (S300). More specifically, the UE may classify a set set based on a normal TTI (that is, a TTI of 1 msec size) into a plurality of measurement sets based on a reduced TTI (ie, a TTI of less than 1 msec size). As such, the plurality of measurement sets may be set according to a unit set based on one or more symbols or a unit based on a TTI. In this case, each measurement set may have the same size as the reduced TTI for transmitting PDSCH or PUSCH.
  • the plurality of measurement sets divided on the basis of the reduced TTI may be divided into a first measurement set consisting of symbols including a reference signal and a second measurement set consisting of symbols not including a reference signal.
  • the UE measures the CSI based on the first measurement set composed of symbols including the reference signal, but may not measure the CSI based on the second measurement set composed of symbols not including the reference signal.
  • the UE transmits the measured CSI to the base station (S400). Specifically, the UE measures the first CSI measured based on the first measurement set composed of symbols including the reference signal and the second CSI measured based on the second measurement set composed of symbols not including the reference signal. Can be transmitted to the base station. Since the degree of interference between the TTI including the reference signal and the TTI without the reference signal may vary according to the traffic environment, it is necessary to distinguish the two CSIs in order to perform more efficient scheduling.
  • Embodiments of the present invention described so far may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof. Specifically, it will be described with reference to the drawings.
  • FIG. 11 illustrates a wireless communication system in which the present disclosure is implemented. Block diagram .
  • the base station 200 includes a processor 201, a memory 202, and a transceiver (or radio frequency (RF) unit) 203.
  • the memory 202 is connected to the processor 201 and stores various information for driving the processor 201.
  • the transceiver unit (or RF unit) 203 is connected to the processor 201 to transmit and / or receive a radio signal.
  • the processor 201 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 201.
  • the wireless device 100 includes a processor 101, a memory 102, and a transceiver (or RF unit) 103.
  • the memory 102 is connected to the processor 101 and stores various information for driving the processor 101.
  • the transceiver unit (or RF unit) 103 is connected to the processor 101 to transmit and / or receive a radio signal.
  • the processor 101 implements the proposed functions, processes and / or methods.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé au moyen duquel un équipement d'utilisateur (UE) rapporte des informations d'état de canal. Le procédé peut comprendre les étapes consistant à : recevoir une sous-trame contenant un signal de référence pour mesurer les informations d'état de canal ; diviser la sous-trame dans une pluralité d'ensembles de mesurage pour mesurer les informations d'état de canal ; mesurer les informations d'état de canal sur la base de chacun de la pluralité d'ensembles de mesurage ; et transmettre les informations d'état de canal mesurées.
PCT/KR2017/000248 2016-01-08 2017-01-09 Procédé de notification d'informations d'état de canal, et équipement d'utilisateur l'exécutant WO2017119794A1 (fr)

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