WO2019070094A1 - Procédé de mesure de canal ou d'interférence dans un système de communication sans fil et appareil associé - Google Patents

Procédé de mesure de canal ou d'interférence dans un système de communication sans fil et appareil associé Download PDF

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Publication number
WO2019070094A1
WO2019070094A1 PCT/KR2018/011672 KR2018011672W WO2019070094A1 WO 2019070094 A1 WO2019070094 A1 WO 2019070094A1 KR 2018011672 W KR2018011672 W KR 2018011672W WO 2019070094 A1 WO2019070094 A1 WO 2019070094A1
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port
channel
interference measurement
resource
interference
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PCT/KR2018/011672
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English (en)
Korean (ko)
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염건일
강지원
김기준
김형태
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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 and apparatus for channel or interference measurement.
  • the present invention proposes a method for channel or interference measurement.
  • a method of measuring and reporting a channel using a port-wise channel and an interference measurement resource in a wireless communication system comprising: performing a port-wise channel and interference Receiving a setting associated with the measurement resource; Wherein the port-wide channel and interference measurement resources correspond to independent interference assumptions for each port and include terminal-group specific channel and interference measurement resources, and wherein the port-wide channel and the interference measurement resource Measuring channel and interference, and reporting measurement results.
  • the UE-group specific channel and interference measurement resources may be for calibrating a previously reported channel quality indicator (CQI).
  • CQI channel quality indicator
  • the UE-group specific channel and interference measurement resources may be set semi-persistently and may be enabled or disabled by signaling from the network.
  • the method assumes that all the ports of the UE-group specific channel and the interference measurement resource are ports through which the interfering signal is transmitted, And < / RTI >
  • the settings related to the UE-group specific channel and interference measurement resources may include a port for channel measurement and an index or number of ports for interference measurement, and the UE- The resource-related settings may be included in an aperiodic reference signal indication for the resource.
  • the port of the terminal-group specific channel and the interference measurement resource corresponds one-to-one with the demodulation reference signal port
  • the demodulation reference signal port for the terminal corresponds to the port for channel measurement, It can be used as a port for interference measurement.
  • the settings related to the UE-group specific channel and interference measurement resources may include information on the number of co-scheduled multi-user (MU) layers or the total number of MU layers.
  • MU co-scheduled multi-user
  • a terminal for performing channel measurement in a wireless communication system comprising: a transmitter and a receiver; And a processor configured to control the transmitter and the receiver, the processor receiving a setting related to a port-wise channel and an interference measurement resource, the port-wise channel and the interference measurement resource being independent of each port And includes terminal-group specific channel and interference measurement resources, and can measure the channel and interference for each port in the port-wise channel and the interference measurement resource, and report the measurement result.
  • the UE-group specific channel and interference measurement resources may be for calibrating a previously reported channel quality indicator (CQI).
  • CQI channel quality indicator
  • the UE-group specific channel and interference measurement resources may be set semi-persistently and may be enabled or disabled by signaling from the network.
  • the processor assumes all ports of the UE-group specific channel and interfering measurement resources as the port through which the interfering signal is transmitted, Can be performed.
  • the settings related to the UE-group specific channel and interference measurement resources may include a port for channel measurement and an index or number of ports for interference measurement, and the UE- The resource-related settings may be included in an aperiodic reference signal indication for the resource.
  • the port of the terminal-group specific channel and the interference measurement resource corresponds one-to-one with the demodulation reference signal port
  • the demodulation reference signal port for the terminal corresponds to the port for channel measurement, It can be used as a port for interference measurement.
  • the settings related to the UE-group specific channel and interference measurement resources may include information on the number of co-scheduled multi-user (MU) layers or the total number of MU layers.
  • MU co-scheduled multi-user
  • a computer-readable storage medium storing computer program code according to another embodiment of the present invention, wherein the computer program code is executable by a processor of a communications device, wherein: the communications device comprises: a port-wise channel and an interference measurement resource And wherein the port-wise channel and the interference measurement resources correspond to independent interference assumptions for each port, and include terminal-group specific channel and interference measurement resources, and wherein the port-wise channel and interference measurement resources It is possible to measure channels and interference for each port in the measurement resource and report the measurement result.
  • Embodiments of the present invention can efficiently process channel and interference measurements.
  • FIG. 1 shows an example of a radio frame structure used in a wireless communication system.
  • FIG. 2 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
  • FIG. 3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.
  • FIG. 4 shows an example of an uplink (UL) subframe structure used in the 3GPP LTE / LTE-A system.
  • FIG. 5 is a reference diagram for explaining a self-contained slot structure in an NR system.
  • FIGS. 6 and 7 are reference views for explaining a connection method of a TXRU (Transceiver Unit) and an antenna element.
  • TXRU Transceiver Unit
  • Fig. 9 shows a situation in which a plurality of different resources and a reporting band do not coincide.
  • Figure 10 shows a block diagram of an apparatus for implementing an embodiment (s) of the present invention.
  • a user equipment may be fixed or mobile and various devices communicating with a base station (BS) to transmit and receive user data and / or various control information.
  • the UE may be a terminal equipment, a mobile station, a mobile terminal, a user terminal, a subscriber station, a wireless device, a personal digital assistant (PDA) modem, a handheld device, and the like.
  • a BS is generally a fixed station that communicates with a UE and / or another BS, and exchanges various data and control information by communicating with a UE and another BS.
  • the BS includes an Advanced Base Station (ABS), a Node-B, an evolved-NodeB, an ng-eNB, a next Generation NodeB, a Base Transceiver System (BTS) Point, a Processing Server (PS), and a transmission point (TP).
  • ABS Advanced Base Station
  • BTS Base Transceiver System
  • PS Processing Server
  • TP transmission point
  • a BS is referred to as an eNB.
  • a node refers to a fixed point that can communicate with a user equipment and transmit / receive a wireless signal.
  • Various types of eNBs can be used as nodes regardless of its name.
  • BS, NB, eNB, pico-cell eNB (PeNB), home eNB (HeNB), relay, repeater, and the like can be nodes.
  • the node may not be an eNB.
  • RRH, RRU, etc. generally have a power level lower than the power level of the eNB.
  • RRH / RRU and RRH / RRU are generally connected to the eNB as a dedicated line such as an optical cable. Therefore, compared with cooperative communication by eNBs connected by radio lines in general, the RRH / RRU and the eNB Can be performed smoothly.
  • At least one antenna is installed in one node.
  • the antenna may be a physical antenna, an antenna port, a virtual antenna, or an antenna group.
  • a node is also called a point.
  • CAS centralized antenna system
  • the plurality of nodes are usually spaced apart by a predetermined distance or more.
  • the plurality of nodes may be managed by at least one eNB or eNB controller that controls operation of each node or that schedules data to be transmitted / received through each node.
  • Each node can be connected to an eNB or an eNB controller that manages the node through a cable or a dedicated line.
  • the same cell identifier (ID) may be used or a different cell ID may be used for signal transmission / reception to / from a plurality of nodes.
  • ID cell identifier
  • each of the plurality of nodes operates as a certain antenna group of one cell.
  • this multi-node system can be viewed as a multi-cell (e.g., macro-cell / femto-cell / pico-cell) system. If multiple cells formed by a plurality of nodes are configured to be overlaid according to coverage, the network formed by the multiple cells is called a multi-tier network in particular.
  • the cell ID of the RRH / RRU and the cell ID of the eNB may be the same or different. When the RRH / RRU uses different cell IDs, the RRH / RRU and the eNB both operate as independent base stations.
  • one or more eNBs or eNB controllers connected to a plurality of nodes may control the plurality of nodes to transmit or receive signals simultaneously to the UE through some or all of the plurality of nodes .
  • the multi-node systems depending on the entity of each node, the implementation type of each node, etc.
  • a plurality of nodes participate in providing communication services to UEs on a predetermined time-frequency resource together
  • Systems differ from single node systems (e.g., CAS, conventional MIMO systems, conventional relay systems, conventional repeater systems, etc.).
  • embodiments of the present invention relating to a method for performing data cooperative transmission using some or all of a plurality of nodes can be applied to various kinds of multi-node systems.
  • a node usually refers to an antenna group located apart from another node by a predetermined distance or more
  • embodiments of the present invention described below may be applied to a case where a node means an arbitrary antenna group regardless of an interval.
  • the eNB may control a node composed of a H-pol antenna and a node composed of a V-pol antenna, and embodiments of the present invention may be applied .
  • a node that transmits / receives a signal through a plurality of transmission (Tx) / reception (Rx) nodes, transmits / receives a signal through at least one node selected from a plurality of transmission / reception nodes, ENB MIMO or CoMP (Coordinated Multi-Point TX / RX) is a communication scheme capable of differentiating nodes receiving uplink signals.
  • Cooperative transmission schemes among the inter-node cooperative communication can be roughly divided into JP (joint processing) and scheduling coordination.
  • the former can be divided into JT (joint transmission) / JR (joint reception) and DPS (dynamic point selection), and the latter can be divided into coordinated scheduling (CS) and coordinated beamforming (CB).
  • DPS is also called DCS (dynamic cell selection).
  • JP refers to a communication technique in which a plurality of nodes transmit the same stream to a UE
  • JR refers to a communication technique in which a plurality of nodes receive the same stream from a UE.
  • the UE / eNB combines signals received from the plurality of nodes to recover the stream.
  • JT / JR since the same stream is transmitted to / from a plurality of nodes, the reliability of signal transmission can be improved by transmission diversity.
  • JP DPS refers to a communication scheme in which a signal is transmitted / received through a node selected according to a specific rule among a plurality of nodes.
  • the reliability of signal transmission can be improved since a node with a good channel condition between the UE and the node will typically be selected as the communication node.
  • a cell refers to a geographical area in which one or more nodes provide communication services. Accordingly, in the present invention, communication with a specific cell may mean communicating with an eNB or a node providing a communication service to the specific cell. Also, the downlink / uplink signals of a particular cell are downlink / uplink signals to / from an eNB or a node that provides communication services to the particular cell. A cell providing an uplink / downlink communication service to a UE is called a serving cell.
  • the channel state / quality of a specific cell means the channel state / quality of a channel or a communication link formed between an eNB or a node providing the communication service to the particular cell and the UE.
  • a UE transmits a downlink channel state from a specific node to an antenna port (s) of the particular node on a channel CSI-RS (Channel State Information Reference Signal) resource allocated to the particular node (CSI-RS).
  • CSI-RS Channel State Information Reference Signal
  • neighboring nodes transmit corresponding CSI-RS resources on mutually orthogonal CSI-RS resources.
  • the fact that the CSI-RS resources are orthogonal can be determined by the CSI-RS by assigning a CSI-RS resource configuration, a subframe offset, and a transmission period specifying a symbol carrying a CSI-RS and a subcarrier.
  • a subframe configuration for specifying the subframes, and a CSI-RS sequence are different from each other.
  • a Physical Uplink Control CHannel (PUCCH), a Physical Uplink Control Channel (PUSCH), a Physical Uplink Control Channel (PUSCH), and a Physical Uplink Control Channel (PUSCH) (Uplink Shared CHannel) / PRACH (Physical Random Access CHannel) refers to a set of time-frequency resources or a set of resource elements each carrying Uplink Control Information (UCI) / uplink data / random access signals.
  • UCI Uplink Control Information
  • the expression that the user equipment transmits a PUCCH / PUSCH / PRACH is referred to as a PUCCH / PUCCH / PRACH or a PUCCH / PUCCH / PRACH through an uplink control information / uplink
  • the expression that the eNB transmits PDCCH / PCFICH / PHICH / PDSCH is used to transmit downlink data / control information on the PDCCH / PCFICH / PHICH / PDSCH, Is used in the same sense.
  • FIG. 1 shows an example of a radio frame structure used in a wireless communication system.
  • FIG. 1 (a) shows a frame structure for a frequency division duplex (FDD) used in a 3GPP LTE / LTE-A system and
  • FDD frequency division duplex
  • TDD Time division duplex
  • the radio frame used in the 3GPP LTE / LTE-A system has a length of 10 ms (307200 Ts) and consists of 10 equal sized subframes (SF). 10 subframes within one radio frame may be assigned respective numbers.
  • Each subframe is 1 ms long and consists of two slots. 20 slots in one radio frame can be sequentially numbered from 0 to 19. [ Each slot has a length of 0.5 ms.
  • the time for transmitting one subframe is defined as a transmission time interval (TTI).
  • the time resource may be classified by a radio frame number (or a radio frame index), a subframe number (also referred to as a subframe number), a slot number (or a slot index), and the like.
  • the wireless frame may be configured differently according to the duplex mode. For example, in the FDD mode, since the downlink transmission and the uplink transmission are divided by frequency, the radio frame includes only one of the downlink subframe and the uplink subframe for a specific frequency band. In the TDD mode, since the downlink transmission and the uplink transmission are divided by time, the radio frame includes both the downlink subframe and the uplink subframe for a specific frequency band.
  • Table 1 illustrates the DL-UL configuration of subframes in a radio frame in TDD mode.
  • D denotes a downlink subframe
  • U denotes an uplink subframe
  • S denotes a special subframe.
  • the specific subframe includes three fields of Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and UpPTS (Uplink Pilot Time Slot).
  • DwPTS is a time interval reserved for downlink transmission
  • UpPTS is a time interval reserved for uplink transmission.
  • Table 2 illustrates the configuration of the singular frames.
  • Figure 2 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
  • Figure 2 shows the structure of the resource grid of the 3GPP LTE / LTE-A system. There is one resource grid per antenna port.
  • a slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain and a plurality of resource blocks (RBs) in a frequency domain.
  • the OFDM symbol also means one symbol period.
  • Wow on the DL transmission bandwidth and the UL transmission bandwidth, respectively.
  • Denotes the number of OFDM symbols in the downlink slot Denotes the number of OFDM symbols in the UL slot. Represents the number of sub-carriers constituting one RB.
  • the OFDM symbol may be referred to as an OFDM symbol, an SC-FDM (Single Carrier Frequency Division Multiplexing) symbol, or the like according to a multiple access scheme.
  • the number of OFDM symbols included in one slot can be variously changed according to the channel bandwidth and the length of the cyclic prefix (CP). For example, one slot includes seven OFDM symbols in the case of a normal CP, whereas one slot includes six OFDM symbols in the case of an extended CP.
  • FIG. 2 illustrates a subframe in which one slot is composed of seven OFDM symbols for convenience of description, embodiments of the present invention may be applied to subframes having a different number of OFDM symbols in a similar manner. Referring to FIG.
  • each OFDM symbol includes, in the frequency domain, * Lt; / RTI > subcarriers.
  • the types of subcarriers can be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of reference signals, guard bands, and null subcarriers for direct current (DC) components .
  • the null subcarrier for the DC component is a subcarrier that is left unused and is mapped to a carrier frequency (f0) in an OFDM signal generation process or a frequency up conversion process.
  • the carrier frequency is also referred to as the center frequency.
  • Day RB is in the time domain (E. G., 7) consecutive OFDM symbols and is defined by c (e. G., Twelve) consecutive subcarriers in the frequency domain.
  • a resource composed of one OFDM symbol and one subcarrier is referred to as a resource element (RE) or a tone. Therefore, one RB * Resource elements.
  • Each resource element in the resource grid can be uniquely defined by an index pair (k, 1) in one slot. k is in the frequency domain from 0 * -1, and l is an index given from 0 to -1.
  • Two RBs one in each of two slots of the subframe occupying consecutive identical subcarriers, are called a physical resource block (PRB) pair.
  • the two RBs constituting the PRB pair have the same PRB number (or PRB index (index)).
  • VRB is a kind of logical resource allocation unit introduced for resource allocation.
  • VRB has the same size as PRB.
  • distributed type VRBs are interleaved and mapped to PRBs. Therefore, the distributed type VRB having the same VRB number can be mapped to different numbers of PRBs in the first slot and the second slot.
  • Two PRBs, which are located in two slots of a subframe and have the same VRB number, are called a VRB pair.
  • FIG. 3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.
  • a DL subframe is divided into a control region and a data region in the time domain.
  • a maximum of 3 (or 4) OFDM symbols located at a first position in a first slot of a subframe corresponds to a control region to which a control channel is allocated.
  • a resource region available for PDCCH transmission in a DL subframe is referred to as a PDCCH region.
  • the remaining OFDM symbols other than the OFDM symbol (s) used as a control region correspond to a data region to which PDSCH (Physical Downlink Shared CHannel) is allocated.
  • PDSCH Physical Downlink Shared CHannel
  • a resource region usable for PDSCH transmission in a DL subframe is referred to as a PDSCH region.
  • Examples of the DL control channel used in the 3GPP LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), and the like.
  • the PCFICH carries information about the number of OFDM symbols transmitted in the first OFDM symbol of the subframe and used for transmission of the control channel in the subframe.
  • the PHICH carries an HARQ (Hybrid Automatic Repeat Request) ACK / NACK (acknowledgment / negative-acknowledgment) signal in response to the UL transmission.
  • HARQ Hybrid Automatic Repeat Request
  • the control information transmitted through the PDCCH is referred to as downlink control information (DCI).
  • the DCI includes resource allocation information and other control information for the UE or UE group.
  • the DCI may include a transport format and resource allocation information of a downlink shared channel (DL-SCH), a transport format and resource allocation information of an uplink shared channel (UL-SCH), a paging channel channel assignment information, upper layer control message resource allocation information, such as paging information on the channel, PCH, system information on the DL-SCH, random access response transmitted on the PDSCH, A Transmit Control Command Set, a Transmit Power Control command, an activation indication information of a Voice over IP (VoIP), and a Downlink Assignment Index (DAI).
  • DL-SCH downlink shared channel
  • UL-SCH uplink shared channel
  • paging channel channel assignment information such as paging information on the channel, PCH, system information on the DL-SCH, random access response transmitted on the PDSCH
  • a Transmit Control Command Set such as pag
  • a transmission format and resource allocation information of a downlink shared channel which is also referred to as DL scheduling information or a DL grant, may be a UL shared channel (UL-SCH)
  • the transmission format and resource allocation information are also referred to as UL scheduling information or UL grant.
  • the DCI carried by one PDCCH differs in size and usage according to the DCI format, and its size may vary according to the coding rate.
  • various formats such as formats 0 and 4 for the uplink and formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 3 and 3A for the downlink are defined.
  • RB allocation a modulation coding scheme (MCS), a redundancy version (RV), a new data indicator (NDI), a transmit power control (TPC), a cyclic shift DMRS control information such as a downlink index, a shift demodulation reference signal, an UL index, a channel quality information (CQI) request, a DL assignment index, a HARQ process number, a transmitted precoding matrix indicator (TPMI)
  • TPMI transmitted precoding matrix indicator
  • the DCI format that can be transmitted to the UE depends on the transmission mode (TM) configured for the UE. In other words, not all DCI formats may be used for UEs configured in a particular transport mode, but only certain DCI format (s) corresponding to the particular transport mode may be used.
  • the PDCCH is transmitted on an aggregation of one or more contiguous control channel elements (CCEs).
  • the CCE is a logical allocation unit used to provide the PDCCH with a coding rate based on radio channel conditions.
  • the CCE corresponds to a plurality of resource element groups (REG). For example, one CCE corresponds to nine REGs, and one REG corresponds to four REs.
  • REG resource element groups
  • a set of CCEs in which a PDCCH can be located for each UE is defined.
  • a set of CCEs in which a UE can discover its PDCCH is referred to as a PDCCH search space, simply a Search Space (SS).
  • SS Search Space
  • PDCCH candidates Individual resources to which the PDCCH can be transmitted within the search space are referred to as PDCCH candidates.
  • the collection of PDCCH candidates to be monitored by the UE is defined as a search space.
  • the search space for each DCI format can have different sizes, and a dedicated search space and a common search space are defined.
  • the dedicated search space is a UE-specific search space and is configured for each individual UE.
  • the common search space is configured for a plurality of UEs.
  • the aggregation level that defines the search space is as follows.
  • One PDCCH candidate corresponds to 1, 2, 4 or 8 CCEs depending on the CCE aggregation level.
  • the eNB transmits the actual PDCCH (DCI) on any PDCCH candidate in the search space, and the UE monitors the search space to find the PDCCH (DCI).
  • the monitoring means to attempt decoding of each PDCCH in the search space according to all the monitored DCI formats.
  • the UE may monitor the plurality of PDCCHs and detect its own PDCCH. Basically, since the UE does not know the location where its PDCCH is transmitted, it tries to decode all PDCCHs of the corresponding DCI format every PDCCH until it detects a PDCCH with its own identifier. This process is called blind detection blind decoding " (BD)).
  • BD blind detection blind decoding &quot
  • the eNB may transmit data for the UE or the UE group through the data area.
  • Data transmitted through the data area is also referred to as user data.
  • a PDSCH Physical Downlink Shared CHannel
  • a paging channel (PCH) and a downlink-shared channel (DL-SCH) are transmitted through the PDSCH.
  • the UE may decode the control information transmitted through the PDCCH and read the data transmitted through the PDSCH.
  • Information indicating to which UE or UE group the data of the PDSCH is transmitted, how the UE or UE group should receive and decode the PDSCH data, and the like are included in the PDCCH and transmitted.
  • a particular PDCCH is masked with a cyclic redundancy check (CRC) with an RNTI (Radio Network Temporary Identity) of "A" and a radio resource (e.g., frequency location)
  • CRC cyclic redundancy check
  • RNTI Radio Network Temporary Identity
  • format information e.g., transport block size, modulation scheme, coding information, etc.
  • the UE monitors the PDCCH using the RNTI information it owns, and the UE having the RNTI of " A " detects the PDCCH and transmits the PDSCH indicated by " B " .
  • Reference signal refers to a signal of a predetermined special waveform that the eNB transmits to the UE or to the eNB by the eNB and the UE, and is also called a pilot.
  • the reference signals are divided into cell-specific RSs shared by all UEs in the cell and demodulation RSs (DM RS) dedicated to specific UEs.
  • DM RS transmitted by the eNB for demodulating the downlink data for a specific UE is also referred to as a UE-specific RS.
  • the DM RS and the CRS may be transmitted together, but only one of them may be transmitted.
  • the DM RS transmitted using the same precoder as the data can be used only for demodulation purposes, and therefore, a channel measurement RS must be separately provided.
  • an additional measurement RS CSI-RS
  • the CSI-RS is transmitted every predetermined transmission period consisting of a plurality of subframes, unlike the CRS transmitted for each subframe, based on the fact that the channel state is not relatively varied with time.
  • FIG. 4 shows an example of an uplink (UL) subframe structure used in the 3GPP LTE / LTE-A system.
  • the UL subframe may be divided into a control domain and a data domain in the frequency domain.
  • One or several physical uplink control channels may be assigned to the control region to carry uplink control information (UCI).
  • One or several physical uplink shared channels may be allocated to the data area of the UL subframe to carry user data.
  • subcarriers far away from the direct current (DC) subcarrier are used as a control region.
  • subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of uplink control information.
  • the DC subcarrier is a component that is left unused for signal transmission and is mapped to the carrier frequency f0 in the frequency up conversion process.
  • a PUCCH for one UE is allocated to an RB pair belonging to resources operating at a single carrier frequency, and RBs belonging to the RB pair occupy different subcarriers in two slots.
  • the PUCCH allocated as described above is expressed as the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary. However, when frequency hopping is not applied, the RB pairs occupy the same subcarrier.
  • the PUCCH may be used to transmit the following control information.
  • - SR (Scheduling Request): Information used for requesting uplink UL-SCH resources. OOK (On-Off Keying) method.
  • HARQ-ACK A response to the PDCCH and / or a response to a downlink data packet (e.g., codeword) on the PDSCH. Indicates whether PDCCH or PDSCH has been successfully received.
  • a downlink data packet e.g., codeword
  • the HARQ-ACK response includes positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission) or NACK / DTX.
  • the term HARQ-ACK is mixed with HARQ ACK / NACK and ACK / NACK.
  • MIMO Multiple Input Multiple Output
  • RI Rank Indicator
  • PMI Precoding Matrix Indicator
  • the amount of uplink control information (UCI) that the UE can transmit in the subframe depends on the number of SC-FDMAs available for control information transmission.
  • the SC-FDMA available for the UCI means the remaining SC-FDMA symbol except for the SC-FDMA symbol for the reference signal transmission in the subframe, and in the case of the subframe configured with the SRS (Sounding Reference Signal) -FDMA symbols are excluded.
  • the reference signal is used for coherent detection of the PUCCH.
  • PUCCH supports various formats depending on the information to be transmitted.
  • Table 4 shows the mapping relationship between the PUCCH format and the UCI in the LTE / LTE-A system.
  • PUCCH format Modulation scheme Number of bits per subframe Usage Etc.
  • One N / A N / A (exist or absent) SR (Scheduling Request) 1a BPSK One ACK / NACK orSR + ACK / NACK
  • One codeword 1b QPSK 2 ACK / NACK orSR + ACK / NACK
  • Two codeword 2 QPSK 20 CQI / PMI / RI Joint coding ACK / NACK (extended CP) 2a QPSK + BPSK 21 CQI / PMI / RI + ACK / NACK Normal CP only 2b QPSK + QPSK 22 CQI / PMI / RI + ACK / NACK Normal CP only 3 QPSK 48 ACK / NACK or SR + ACK / NACK orCQI / PMI / RI + ACK / NACK
  • the PUCCH format 1 sequence is mainly used for transmitting ACK / NACK information
  • the PUCCH format 2 sequence is mainly used for carrying channel state information (CSI) such as CQI / PMI / RI
  • the PUCCH format 3 sequence is mainly used to transmit ACK / NACK information.
  • a reference signal (RS) A reference signal (RS)
  • a packet When a packet is transmitted in a wireless communication system, since the transmitted packet is transmitted through a wireless channel, signal distortion may occur in the transmission process. In order to properly receive the distorted signal at the receiving side, the distortion should be corrected in the received signal using the channel information.
  • the channel information In order to determine the channel information, a method is used in which a signal known to both the transmitting side and the receiving side is transmitted, and channel information is detected with a degree of distortion when the signal is received through the channel. The signal is referred to as a pilot signal or a reference signal.
  • each transmitting antenna When transmitting and receiving data using multiple antennas, it is necessary to know the channel condition between each transmitting antenna and the receiving antenna so that a correct signal can be received. Therefore, there is a separate reference signal for each transmission antenna, more specifically, for each antenna port (antenna port).
  • the reference signal may be divided into an uplink reference signal and a downlink reference signal.
  • an uplink reference signal as an uplink reference signal,
  • DM-RS demodulation reference signal
  • the base station has a Sounding Reference Signal (SRS) for the network to measure the uplink channel quality at different frequencies.
  • SRS Sounding Reference Signal
  • CRS cell-specific reference signal
  • DM-RS DeModulation-Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • MBSFN Reference Signal MBSFN Reference Signal transmitted for coherent demodulation on a signal transmitted in MBSFN (Multimedia Broadcast Single Frequency Network) mode
  • the reference signal can be roughly classified into two types according to its purpose. There are a target reference signal for channel information acquisition and a reference signal used for data demodulation.
  • the former can acquire channel information on the downlink because the UE can acquire the channel information. Therefore, the former must receive the reference signal even if the terminal does not receive the downlink data in a specific subframe. It is also used in situations such as handover.
  • the latter is a reference signal sent together with a corresponding resource when a base station transmits a downlink, and the terminal can demodulate data by performing channel measurement by receiving the reference signal. This reference signal should be transmitted in the area where data is transmitted.
  • a user equipment In the 3GPP LTE (-A) system, a user equipment (UE) is defined to report channel state information (CSI) to a base station (BS), and channel state information (CSI) Refers to information that can indicate the quality of a channel (or a link). For example, a rank indicator (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), and the like.
  • RI denotes rank information of a channel, which means the number of streams that the UE receives through the same time-frequency resource. Since this value is determined by being dependent on the long term fading of the channel, it is fed back from the UE to the BS with a period longer than the PMI, CQI, usually longer.
  • the PMI is a value reflecting the channel space characteristic and indicates a preferred precoding index of the UE based on a metric such as SINR.
  • the CQI is a value representing the strength of a channel, and generally refers to a reception SINR that can be obtained when the BS uses the PMI.
  • the UE Based on the measurement of the radio channel, the UE computes the preferred PMI and RI that can derive an optimal or maximum transmission rate if used by the BS under the current channel conditions, and feeds the calculated PMI and RI back to the BS do.
  • the CQI refers to a modulation and coding scheme that provides an acceptable packet error probability for the feedback PMI / RI.
  • the current CSI feedback is defined in LTE and therefore does not adequately support such newly introduced operations.
  • PMI can be used for long term / wideband PMI (W 1 ) and short term short term / subband PMI (W 2 ).
  • W 1 wideband PMI
  • W 2 short term short term / subband PMI
  • the final PMI is expressed as a function of W 1 and W 2 .
  • Table 5 shows the uplink channels used for CSI transmission in the 3GPP LTE (-A) system.
  • the CSI can be transmitted using a physical uplink control channel (PUCCH) at a predetermined period in an upper layer, and can be periodically transmitted to a physical uplink shared channel Shared Channel, PUSCH).
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel Shared Channel
  • a control signal requesting transmission of CSI to a PUSCH scheduling control signal (UL Grant) transmitted in a PDCCH signal may be included.
  • the following table shows the UE mode when transmitting CQI, PMI, and RI through PUSCH.
  • the transmission mode in Table 6 is selected in the upper layer, and CQI / PMI / RI are all transmitted in the same PUSCH subframe.
  • CQI / PMI / RI are all transmitted in the same PUSCH subframe.
  • Mode 1-2 shows a case where a precoding matrix is selected on the assumption that data is transmitted only through subbands for each subband.
  • the UE generates the CQI by assuming a selected precoding matrix for the entire band (set S) designated by the system band or an upper layer.
  • the UE can transmit the CQI and the PMI value of each subband.
  • the size of each subband may vary depending on the size of the system band.
  • the UE in mode 2-0 can select M subbands preferred for the designated band (set S) designated by the system band or the upper layer.
  • the UE may generate one CQI value on the assumption that it transmits data for the selected M subbands.
  • the UE further preferably reports one CQI (wideband CQI) value for the system band or set S.
  • the UE defines a CQI value for each codeword in a differential format.
  • the difference CQI value is determined by a difference between the index corresponding to the C sub-band for the selected M subbands and the wideband CQI (Wideband CQI) index.
  • the UE transmits information on the positions of the selected M subbands, one CQI value for the selected M subbands, and the CQI value generated for the entire band or the designated band (set S) to the BS .
  • the size and the M value of the subband can be changed according to the size of the system band.
  • a mode 2-2 (Mode 2-2) UE selects a single precoding matrix for M preferred subbands and M preferred subbands at the same time, assuming that the data is transmitted through M preferred subbands .
  • the CQI values for the M preferred subbands are defined for each codeword.
  • the UE further generates a wideband CQI value for the system band or the designated band (set S).
  • the UE in mode 2-2 receives information on the location of M preferred subbands, one CQI value for selected M subbands, a single PMI for M preferred subbands, a wideband PMI, and a wideband CQI value BS. At this time, the size and the M value of the subband can be changed according to the size of the system band.
  • the UE in mode 3-0 (Mode 3-0) generates a wideband CQI value.
  • the UE generates a CQI value for each subband on the assumption that data is transmitted through each subband. At this time, even if RI> 1, the CQI value represents only the CQI value for the first codeword.
  • a UE in mode 3-1 (Mode 3-1) generates a single precoding matrix for a system band or a designated band (set S).
  • the UE assumes a single precoding matrix generated for each subband, and generates a subband CQI for each codeword.
  • the UE may assume a single precoding matrix and generate a wideband CQI.
  • the CQI value of each subband can be expressed in a differential format.
  • the subband CQI value is calculated as the difference between the subband CQI index and the wideband CQI index.
  • the size of the sub-band may vary depending on the size of the system band.
  • the UE in mode 3-2 (mode 3-2) generates a precoding matrix for each subband, instead of a single precoding matrix for the entire band, as compared with mode 3-1.
  • the UE may periodically transmit CSI (e.g., precoding type indicator (CQI) / precoding indicator (PTI) and / or RI information) to the BS via the PUCCH. If the UE receives a control signal to transmit user data, the UE may transmit the CQI via the PUCCH.
  • CQI / PMI / PTI / RI can be transmitted by one of the modes defined in the following table, even if the control signal is transmitted through the PUSCH.
  • PMI feedback type No PMI Single PMI PUCCH CQI feedback type Broadband (broadband CQI) Mode 1-0 Mode 1-1 UE selection (subband CQI) Mode 2-0 Mode 2-1
  • the UE may have a transmission mode as shown in Table 7. < tb > < TABLE > Referring to Table 7, in the case of Mode 2-0 (Mode 2-0) and Mode 2-1 (Mode 2-1), a Bandwidth Part (BP) is a set of subbands located consecutively in the frequency domain System band or the designated band (set S). In Table 7, the size of each subband, the size of BP, and the number of BPs may vary depending on the size of the system band. Also, the UE transmits the CQIs in the frequency domain in the ascending order so as to cover the system band or the designated band (set S).
  • a Bandwidth Part is a set of subbands located consecutively in the frequency domain System band or the designated band (set S).
  • the size of each subband, the size of BP, and the number of BPs may vary depending on the size of the system band.
  • the UE transmits the CQIs in the frequency domain in
  • the UE may have the following PUCCH transmission types.
  • Type 1 Transmits the subband CQI (SB-CQI) of Mode 2-0 (Mode 2-0) and Mode 2-1 (Mode 2-1).
  • Type 1a transmits subband CQI and second PMI
  • Type 2b Broadband CQI and PMI (WB-CQI / PMI) are transmitted.
  • Type 2a Broadband PMI is transmitted.
  • Type 3 Transmit the RI.
  • Type 4 Broadband CQI is transmitted.
  • Type 5 transmit RI and wideband PMI.
  • Type 6 transmits RI and PTI.
  • Type 7 CSI-RS resource indicator (CRI) and RI are transmitted.
  • Type 8 CRI, RI and broadband PMI are transmitted.
  • Type 9 CRI, RI and PTI (precode type indication) are transmitted.
  • Type 10 transmits CRI.
  • the CQI / PMI is transmitted in a subframe having different periods and offsets.
  • the CQI / PMI is not transmitted.
  • the current LTE standard uses the 2-bit CSI request field in DCI format 0 or 4 to operate acyclic CSI feedback when considering a carrier aggregation (CA) environment.
  • the UE interprets the CSI request field as two bits when a plurality of serving cells are set in the CA environment. If one of the TMs 1 to 9 is set for all CCs (Component Carriers), the aperiodic CSI feedback is triggered according to the values in Table 8 below, and TM 10 for at least one of the CCs If set, aperiodic CSI feedback is triggered according to the values in Table 9 below.
  • Non-periodic CSI reporting is not triggered '01' Non-periodic CSI reporting is triggered on the serving cell '10'
  • Aperiodic CSI reporting is triggered on the first set of serving cells set by the upper layer '11' Non-periodic CSI reporting is triggered on the second set of serving cells set by the upper layer
  • Non-periodic CSI reporting is not triggered '01' Non-periodic CSI reporting is triggered for the set of CSI processes set by the upper layer for the serving cell '10' Non-periodic CSI reporting is triggered for the first set of CSI processes set by the upper layer '11' Non-periodic CSI reporting is triggered for the second set of CSI processes set by the upper layer
  • Newt new radio technology
  • MTC Massive Machine Type Communications
  • a design of a communication system considering a service / UE sensitive to reliability and latency has been proposed.
  • a new wireless access technology system has been proposed as a new wireless access technology considering enhanced mobile broadband communication, massive MTC, and URLLC (Ultra-Reliable and Low Latency Communication).
  • the present invention is referred to as New RAT or NR (New Radio) for the sake of convenience.
  • mu and cyclic prefix information for each carrier bandwidth part can be signaled for each of a downlink (DL) or uplink (UL).
  • mu and cyclic prefix information for the downlink carrier bandwidth part may be signaled via higher layer signaling DL-BWP-mu and DL-MWP-cp.
  • the ⁇ and cyclic prefix information for the uplink carrier bandwidth part may be signaled via higher layer signaling UL-BWP-mu and UL-MWP-cp.
  • downlink and uplink transmission are composed of 10 ms long frames.
  • the frame may be composed of 10 sub-frames each having a length of 1 ms. At this time, the number of consecutive OFDM symbols for each subframe is to be.
  • Each frame may be composed of two half frames having the same size.
  • each half-frame may be composed of sub-frames 0 - 4 and 5 - 9, respectively.
  • the slots are arranged in ascending order within one subframe Are numbered in ascending order within one frame As shown in FIG.
  • the number of consecutive OFDM symbols in one slot ( ) Can be determined according to the cyclic prefix as shown in the following table.
  • a starting slot in one subframe ( ) Is the starting OFDM symbol ( )
  • the time dimension Table 4 shows the number of OFDM symbols per slot / per frame / subframe for a normal cyclic prefix
  • Table 5 shows the number of OFDM symbols per slot / frame / subframe for an extended cyclic prefix. Represents the number of OFDM symbols per subframe.
  • a self-contained slot structure can be applied with the slot structure as described above.
  • FIG. 5 is a view showing a self-contained slot structure applicable to the present invention.
  • the base station and the UE can sequentially perform DL transmission and UL transmission within one slot, and transmit and receive DL data within the one slot and transmit / receive UL ACK / NACK thereto.
  • this structure reduces the time it takes to retransmit data when a data transmission error occurs, thereby minimizing the delay in final data transmission.
  • a time gap of a certain time length is required for the base station and the UE to switch from the transmission mode to the reception mode or to switch from the reception mode to the transmission mode.
  • some OFDM symbols at the time of switching from DL to UL in the self-supporting slot structure may be set as a guard period (GP).
  • the self-supporting slot structure includes both the DL control region and the UL control region has been described, but the control regions may be selectively included in the self-supporting slot structure.
  • the self-supporting slot structure according to the present invention may include not only the DL control region and the UL control region but also the DL control region or the UL control region as shown in FIG.
  • a slot may have various slot formats.
  • the OFDM symbol of each slot can be classified into a downlink (denoted by 'D'), a flexible (denoted by 'X'), and an uplink (denoted by 'U').
  • the UE in the downlink slot, the UE generates downlink transmission only in 'D' and 'X' symbols. Similarly, in the uplink slot, the UE can assume that the uplink transmission occurs only in the 'U' and 'X' symbols.
  • the wavelength is short, and it is possible to install a plurality of antenna elements in the same area. That is, since the wavelength is 1 cm in the 30 GHz band, a total of 100 antenna elements can be provided when a 2-dimensional array is arranged at intervals of 0.5 lambda (wavelength) on a panel of 5 * 5 cm. Accordingly, in a millimeter wave (mmW), a plurality of antenna elements can be used to increase the beamforming (BF) gain to increase the coverage or increase the throughput.
  • BF beamforming
  • each antenna element may include TXRU (Transceiver Unit) so that transmission power and phase can be adjusted for each antenna element.
  • TXRU Transceiver Unit
  • each antenna element can perform independent beamforming for each frequency resource.
  • hybrid beamforming having B TXRUs that are fewer than Q antenna elements as an intermediate form of digital beamforming and analog beamforming can be considered.
  • the direction of a beam that can be transmitted at the same time may be limited to B or less.
  • FIGS. 6 and 7 are views showing typical connection methods of the TXRU and the antenna element.
  • the TXRU virtualization model shows the relationship between the output signal of the TXRU and the output signal of the antenna element.
  • FIG. 6 is a diagram illustrating a manner in which a TXRU is connected to a sub-array.
  • the antenna element is connected to only one TXRU.
  • FIG. 7 is a diagram illustrating a manner in which TXRU is connected to all antenna elements.
  • the antenna element is connected to all TXRUs.
  • the antenna element requires a separate adder as shown in FIG. 8 to be connected to all TXRUs.
  • W represents a phase vector multiplied by an analog phase shifter. That is, W is a main parameter for determining the direction of the analog beamforming.
  • the mapping between the CSI-RS antenna port and the TXRUs may be 1: 1 or 1: to-many.
  • the analog beamforming (or RF (Radio Frequency) beamforming) means an operation of performing precoding (or combining) in the RF stage.
  • the baseband stage and the RF stage perform precoding (or combining), respectively. This has the advantage of achieving performance close to digital beamforming while reducing the number of RF chains and the number of digital-to-analog (or analog-to-digital) converters.
  • the hybrid beamforming structure may be represented by N transceiver units (TXRU) and M physical antennas.
  • TXRU transceiver units
  • the digital beamforming for the L data layers to be transmitted by the transmitting end may be represented by an N * L (N by L) matrix.
  • the converted N digital signals are then converted to an analog signal through a TXRU, and an analog beamforming represented by an M * N (M by N) matrix is applied to the converted signal.
  • Figure 8 is a simplified representation of a hybrid beamforming structure in terms of TXRU and physical antennas.
  • the number of digital beams is L and the number of analog beams is N in FIG.
  • the base station is designed to change the analog beamforming on a symbol-by-symbol basis, thereby considering a method of supporting more efficient beamforming to a terminal located in a specific area.
  • a specific N TXRU and M RF antennas are defined as one antenna panel
  • a plurality of antenna panels, to which independent hybrid beamforming is applicable To be introduced.
  • an analog beam advantageous for signal reception may be different for each terminal. Accordingly, in the NR system to which the present invention can be applied, a base station applies a different analog beam for each symbol in a specific sub-frame SF (at least a synchronization signal, system information, paging, etc.) Beam sweeping operations are being considered to allow reception opportunities.
  • a specific sub-frame SF at least a synchronization signal, system information, paging, etc.
  • resource settings In New R. MIMO, resource settings, reporting settings, and measurement settings are defined for calculation and reporting of CSI.
  • the resource settings include the setting of channel measurement resources (CMR) and interference measurement resources (IMR) such as CSI-RS.
  • the reporting settings include settings (e.g., subband settings, reporting parameters such as RI / PMI / CQI, reporting timing, etc.) for the calculation and reporting of the CSI.
  • the measurement settings select measurement resources within the resource settings to calculate / report the CSI of each reporting setting.
  • a representative example of the CMR is a non-zero power (NZP) CSI-RS
  • a representative example of the IMR is a zero-power (ZP) CSI-RS based IMR. Both resources are supported in New Rat.
  • the following port-wise NZP CSI-RS based IMR is defined in Newt MIMO.
  • the UE can be set up with a set of NZP CSI-RS ports for interference measurement.
  • each port of each set corresponds to an interference layer.
  • the choice of precoder to be applied on the NZP CSI-RS for interference measurement depends on the gNB implementation.
  • Port-Wise NZP CSI-RS based IMR emulates and transmits different interference for each port using NZP CSI-RS precoded by base station, unlike the existing ZP CSI-RS based IMR, Different interference is measured for each port and reflected in CSI calculation.
  • Such an NZP CSI-RS based IMR is introduced to avoid setting too many ZP CSI-RS based IMRs in situations where the number of interference hypothesis to consider is too high, such as MU interference.
  • this specification proposes a method of defining and using two types of NZP CSI-RS based IMR as follows.
  • RS Type I Terminal-dedicated P-IMR or CIMR
  • Each RS type includes an RS type I-terminal-dedicated P-IMR or CIMR for measuring / reporting a CSI reflecting UE's different interference assumptions regardless of scheduling, and a scheduling unit for measuring / reporting MU CSI, And an RS type II-UE-group-specific CIMR for reporting.
  • RS type I-terminal-dedicated P-IMR or CIMR for measuring / reporting a CSI reflecting UE's different interference assumptions regardless of scheduling
  • a scheduling unit for measuring / reporting MU CSI
  • an RS type II-UE-group-specific CIMR for reporting.
  • ⁇ P-IMR Port-Wise NZP CSI-RS based IMR. Different interferences are transmitted through precoded NZP CSI-RS for each port (resource unit corresponding to each port). This does not include the required channel port.
  • ⁇ CIMR P-IMR contains ports reflecting the required channels as some ports.
  • I-port Port for interference measurement. NZP CSI-RS based IMR port.
  • ZP-Port Port for interference measurement.
  • the P-IMR in the configuration side can be freely set,
  • the CIMR may be the same.
  • ⁇ RS Type I Terminal - dedicated port group setting / instruction for P-IMR or CIMR
  • RS Type I is set UE-specific as an IMR for general CSI calculation / reporting (i.e., RI, PMI, CQI).
  • RS Type I is set up with NZP CSI-RS for channel measurement and ZP CSI-RS-based IMR for interference measurement. This can be defined to measure at each port a general interference hypothesis, such as coordinated multiple transmission and reception (CoMP) interference, inter-beam interference, as well as MU interference.
  • CoMP coordinated multiple transmission and reception
  • the UE regards the sum of the interference transmitted from each I-port of the corresponding NZP CSI-RS-based IMR as one interference and calculates / reports CSI or, if there is a separate setting / indication, It is possible to report the reflected CQI or to calculate / report a plurality of CQIs reflecting the interference of each port.
  • This type of RS type I may include both cases with and without a C-port, and regardless of whether the CIMR / P-IMR is present, at least a separate CMR for the determination of the PMI may be included in the same reporting setting Respectively.
  • Such an aperiodic RS indication for RS Type I is triggered by the UL DCI, and the measurement result therefor, i.e. CSI, can be reported via UL resources.
  • ⁇ RS Type II Terminal - Group - Set / Instruction of Port Group for Specific CIMR
  • RS Type II is defined for the calculation of MU CQI and is based on the previously reported SU CQI or preliminary MU CQI based on measured channel and interference measurements from the designated C-port and I- (CQI reflecting cross-layer interference from a co-scheduled terminal set assumed by the base station instead of the actual co-scheduled terminal).
  • the RS type II can be shared by terminal groups scheduled or scheduled to be scheduled, thereby reducing RS overhead in terms of cells. In this case, a separate CMR or IMR is not additionally set in the report setting in which the corresponding RS type II is set, and it is possible to operate with only a single RS.
  • Such RS type II can be used as a semi-persistent CIMR. This can be activated / deactivated by a separate MAC CE or DCI, or the corresponding RS type II is activated at the moment the UE is scheduled, and the corresponding RS type II is deactivated at the same time as the UE finishes the scheduling It can be used without any signaling.
  • An unscheduled UE can also measure the corresponding RS type II in preparation for scheduling, which can be accomplished by instructing the UE to measure the corresponding RS type II through aperiodic RS indication or signaling including it.
  • the terminal can calculate / report the CSI by considering all ports as I-ports at that time.
  • Such an aperiodic RS indication for RS Type II can be triggered with DL DCI.
  • other aperiodic CSI trigger / aperiodic CSI-RS triggers can be separated from those sent to the UL DCI.
  • the RS type II can presume that the interferences change every moment according to the co-scheduled UE, so that MR on (i.e. measurement at different timings The interference measurement result is regarded as a different interference, and the post-processing such as the averaging is not performed).
  • RS Type I and RS Type II can operate in the following manner.
  • the base station sets the following reporting settings to the terminal.
  • the reporting settings use ZP CSI-RS based IMR or / and RS Type I with NZP CSI-RS for channel measurement.
  • reporting setting 2 including only CQI report.
  • the reporting settings use RS Type II.
  • the base station requests CSI for reporting setting 1. (In case of periodic / semi-persistent CSI, a separate CSI request is not needed.)
  • the UE measures the NZP CSI-RS, ZP CSI-RS based IMR and RS type I for the set channel measurement, / Report the CQI.
  • the terminal can report the MU CQI based on the interference of each port of the designated RS type I.
  • the base station Based on the reported RI / PMI / CQI, the base station selects the MU terminal to be scheduled together and the rank / PMI to use for each terminal.
  • the BS determines the DMRS port to be used by each MS and performs initial PDSCH scheduling to each MS.
  • the base station requests CSI for reporting setting 2. (In case of periodic / semi-persistent CSI, there is no need for a separate CSI request.)
  • the terminal assumes that the RS type II connected to the DMRS port assigned to itself is a C-port, and assumes that the remaining ports are I-ports To measure / report MU CQI.
  • the base station corrects the MCS of each terminal using the reported MU CQI.
  • the base station can set the same parameters as those set in the NZP CSI-RS, which are common to RS types I and II. For example, the following parameters can be set in common.
  • Type of RS for example, NZP CSI-RS, ZP CSI-RS based IMR, NZP CSI-RS based IMR (RS Type I, RS Type II)
  • CDM Code division multiplexing
  • Timing behavior eg, acyclic / semi-persistent / periodic
  • Period and slot offset information also includes period and slot offset information.
  • BWP Bandwidth part
  • Time / frequency MR can be signaled separately.
  • Power indicator (e.g., p_c)
  • the power indicator here can be set differently for each port.
  • the configuration of the C-port, I-port and ZP-port can be informed.
  • the port configuration settings for each RS type can be as follows.
  • the base station can set the port index of the RS type I ZP-port, C-port, I-port, or / and each port number to the UE through upper-layer signaling such as RRC.
  • RRC upper-layer signaling
  • the port number is set without a separate port index, it can be mapped in order of ZP port-> C- port-> I- port.
  • the above-mentioned parameters may be set in the DCI by the DCI included in the aperiodic RS indication.
  • one of the parameters described above may be excluded.
  • the ZP-port is not included, only one of the number of C-ports or I-ports may be additionally set to set the number of C-ports and I-ports of the corresponding RS type I.
  • Or may be determined according to predetermined rules and / or external parameters, without port setting for explicit RS type I. For example, it can be mapped in order of ZP port-> C- port-> I- port for the set port numbers.
  • the ZP-port must be defined on one of the ports that takes up CDM [1, 1, 1]. Since such a port typically uses the lowest indexed port, the ZP-port can be mapped to the lowest index.
  • the number of C-ports is assumed to be equal to the rank (or CW (codeword) number corresponding to the most recently reported RI).
  • the number of codewords is used as the number of C-ports and if the maximum rank that the terminal using MU scheduling can use from the SU point of view is equal to or less than the maximum number of layers in one codeword (e.g., 4 layers)
  • the number of C-ports can also be fixed to one.
  • the number of I-ports can be determined in the same way. In other words, it can be assumed that the I-port is set for the remaining ports except the number of ports corresponding to the most recently reported RI.
  • the same port mapping can be assumed even if the port on which the I-port of the P-IMR starts does not have the C-port.
  • the signaling for the mapping between the C-port and the I-port needs to be transmitted to the UE, which can transmit the dynamic signaling such as DCI to the UE by including it in the corresponding RS indication.
  • the base station can set the port index and / or the port number of the corresponding RS type II C-port, I-port, and ZP-port to the UE through upper-layer signaling such as RRC.
  • the ZP-port may not be included for RS type II.
  • the UE can only feed back the CQI.
  • the CQI only feedback is set in the corresponding reporting setting, and can be limited to the case set by the RS type II.
  • the resource may not be measured by the UE.
  • the above-mentioned parameters may be set in the DCI by the DCI included in the aperiodic RS indication.
  • the total number of RS type II ports can be limited to the maximum number of MU layers considering the number of antenna ports of the base station and the terminal and the maximum number of ports of the DMRS.
  • each port of the RS type II is mapped to the DMRS port one to one .
  • the terminal regards the RS type II port corresponding to the DMRS port used by itself as the C-port and the rest as the I-port. That is, the number of C-ports is set by the rank (or the number of CWs corresponding thereto) scheduled by itself.
  • the base station can inform the DCI of the total co-scheduled MU-layer number M, in which case M ports are considered as I-ports since the C-port, and the measurement results of the remaining ports can be ignored.
  • the base station can inform the UE of the total number of MU layers M_tot. In this case, since the C-port (M_tot - the number of C-ports) ports are regarded as I-ports, .
  • the UE can regard the RS type II as having no C-port. In this case, a separate NZP CSI-RS for channel measurement or separate reporting settings is required.
  • a similar operation can be performed without setting the C-port, which needs to be set up for measurement of a channel requiring a separate resource.
  • a separate NZP CSI-RS or a DMRS reflecting the precoding determined at the transmission and reception point (TRP) side may be designated as a resource for channel measurement.
  • an NZP CSI-RS configured with ports representing a channel in which a precoded NZP CSI-RS is required is configured similarly to the NZP CSI-RS-based IMR .
  • the C-port and I-port can be used differently at the RB-level.
  • an even-numbered-RB may be configured with a C-port, i.e., ports for channel measurement
  • an odd-RB may comprise an I-port, i.e., ports for interference measurement.
  • only port number setting for each port type is required without signaling / setting related to a separate port index.
  • the PRB bundling size can be informed to the terminal.
  • NZP CSI- RS base IMR For port settings Signaling And settings
  • NZP CSI-RS based IMR The main use case of NZP CSI-RS based IMR is for more accurate MU CQI estimation.
  • the ZP CSI-RS based IMR seems to be sufficient for interference measurements from other use cases, for example other TRP / beams.
  • the previous agreement should be that the beam of the interfering terminal must be determined before the IM NZP CSI-RS transmission, since the terminal should assume that each port of each set corresponds to an interference layer. Since each of the MU terminals considers the required channel of the other terminal as interference, the interference beam as well as the required beam must be determined before the channel measurement NZP CSI-RS transmission. Otherwise, the reported MU-CQI is not accurate because some of the MU terminals report an MU-CQI assuming an outdated MU interference beam.
  • the UE must assume that the channel measurement NZP CSI-RS ports correspond to the required layer, which means that it assumes an identity precoder when calculating the MU-CQI. This principle is also applied to channel measurement NZP CSI-RS ports corresponding to the interference layer.
  • one NZP CSI-RS may be shared with the MU terminals, and the port groups representing the channel and interference may be exchanged in a terminal-specific manner.
  • four CSI-RS ports are commonly set for terminal 0 and terminal 1, ports 0 and 1 are beamformed to the required beam of terminal 0, and ports 2 and 3 are beam- Shaped.
  • Terminal 0 may be instructed to calculate CSI assuming that ports 0 and 1 are channels and ports 2 and 3 are interferers and UE1 may be instructed to intercept ports 2 and 3 as channels and ports 0 and 1 as interfering, Lt; / RTI >
  • the set of ports for channel and interference measurements may be explicitly indicated or implicitly determined based on the previously reported RI.
  • Non-periodic resources can be regarded as RS type I
  • semi-persistent resources can be regarded as RS type II.
  • the same report setting includes a separate RS, especially RS for channel measurement, it can be regarded as RS Type I, other RS, especially if RS for channel measurement is not included.
  • reporting setting includes CQI / PMI / RI feedback, it can be regarded as RS type II if it reports only RS type I and CQI.
  • RS type I if the dynamic signaling that specifies the type I or II and parameters for it is sent to the UL DCI, or RS type II if it is sent to the DL DCI.
  • a report using RS Type II can assume the following behavior (in the absence of a separate setting) as compared to RS Type I.
  • the reporting timing can be limited to 0 or 1 slots (from DCI trigger point).
  • the time required for calculating the CSI is small. Therefore, in case of non-periodic CSI reporting for RS type II, the CSI can use the PUSCH resource in the same slot if it is the next slot immediately after the measurement time or the self-contained slot even if there is no separate timing signaling As shown in FIG. In particular, this case can be limited to CSI only cases without PUSCH data. This applies equally to periodic / semi-persistent reporting, so that CSI can be reported using the PUCCH resource of the slot or the next slot.
  • feedback via the PUCCH may limit transmission or reporting resources. This can perform feedback through the PUCCH resource without additional scheduling, especially when operating as the semi-persistent IMR described above.
  • - NZP CSI-RS resources are set to the UE for channel and interference measurements
  • the subset of the set of NZP CSI-RS resources is for channel measurements, and the other subset is for interference measurements.
  • the network indicates a subset of the NZP CSI-RS resource (s) for channel measurements via the DCI and a subset of the CSI-RS resource (s) for interference measurements.
  • the DCI indication is dynamic triggering of one or more CSI reporting settings (s) will be discussed, determined,
  • each port of the channel measurement NZP CSI-RS resource (s) corresponds to the required layer.
  • the above-mentioned CIMR / PIMR is set as a resource unit. That is, for a set of NZP CSI-RS resources, a subset of one or more NZP CSI-RS resources is set up / signaled and the base station receives a subset of resources actually measured through dynamic signaling, such as DCI, and / It may inform the UE whether each subset of RS resources is for channel measurement or for interference measurement.
  • the corresponding port-wide NZP CSI-RS-based IMR is set in a (partial) set of resources (for example, a subset of resources is CMR or IMR or DCI (Eg, CSI-RS power, timing behavior (periodic / semi-persistent / non-periodic), period / offset, etc.) that can be independently set for each resource configuration Can be set differently, and ambiguity can occur in channel / interference measurement of the aggregated resources. Therefore, we propose the following method to solve this problem.
  • the set of parameters for that resource configuration may contain one or more of the following parameters.
  • the parameter list to be applied may be defined in advance or may be set to upper-layer signaling such as RRC.
  • Timing behavior eg, acyclic / semi-continuous / periodic
  • BWP Bandwidth Part
  • Power indicator (e.g., p_c)
  • the technique is not limited to NZP CSI-RS based IMR setup / signaling based on a subset of resources.
  • a subset of each resource is set for C-port / I-port to be set for port-wise channel measurement / port-wise interference measurement.
  • the timing behavior of the above parameters can be assumed to be aperiodic. This is because the IMR of the NZP CSI-RS is defined for the MU situation and the channel / interference shown to the UE in the resource is changed dynamically according to time. For similar reasons, the terminal may operate assuming MR on.
  • the BWP index can be assumed to be the same as the currently active BWP of the UE. This is because, similar to the above, the resource is created taking into account the MU situation, and thus it is desirable that the CSI for the current scheduled or scheduled BWP is reported.
  • the density 1.
  • the resource assumes a manner in which the UE measures the power of the beamformed CSI-RS transmitted by the base station, it is assumed that the corresponding resource has the same power as the data, that is, It can be assumed that it has a power difference.
  • the resource to be defined as a configuration-reference resource within a subset of resources or a collection of resources may be defined in advance or may be set to higher-layer signaling such as RRC.
  • a resource with the lowest index (within a subset of resources or a set of resources) may be a configuration-based resource.
  • a set-reference resource is set for a subset of the resources to be actually used, and the set-reference resource can be applied to a set of resources or a subset of selected resources.
  • a setting-reference resource can be determined based on a specific parameter. For example, a resource having the smallest number of ports may be determined as a configuration-reference resource.
  • the method can be understood as a method of using a specific representative value among a plurality of set values. For example, the smallest value, the largest value, or the median / average value may be used for a plurality of power offset values for a set plurality of resources.
  • the CSI report selects one or more subsets, assigns channel / interference measurements for each subset, measures a subset of that resource and calculates / reports the specified CSI.
  • a parameter list for the corresponding C-port and / or I-port may be set as a collection of resources or resource units.
  • Such a scheme may be implemented in a manner that sets / defines different setting parameter values, in particular a lower / upper limit, between the NZP CSI-RS based IMR and a value that can be set for different types of channel / .
  • the parameter value set in the NZP CSI-RS based IMR can be interpreted as min (maximum value, set value).
  • the BS may perform a signaling such as L2 CE signaling such as MAC CE or a DCI Through L1 signaling, you can set the terminal to actually use the parameter value (ignoring the parameter (s) set in the resource configuration).
  • the DCI signaling can be transmitted together with the above-mentioned aperiodic RS indication.
  • a subset of resources is set / defined / signaled to measure as a generic channel measurement instead of a port-wise channel measurement, then the subset of that resource is not aggregated and only one resource (e.g., the first resource) have. Otherwise, if the same aggregation is used, the above method can be applied equally. However, in this case, general channel measurement and setting / signaling used for port-wise channel measurement can be separated and set / defined.
  • the terminal may not expect different settings (s) to be set for some or all of the above parameters for resources that are aggregated into a (sub) set of one resource.
  • the base station gives the same settings to all resources for some or all of the parameters for the resources in the (partial) set of corresponding resources, and the terminal also expects the base station to do so. For example, for power offset, RB-level density, and band setting, the terminal may not expect the settings of each resource to be set differently.
  • a mismatch may occur with the CSI reporting band (i. E., A subset of the subbands of the bandwidth part for CSI reporting).
  • the situation shown in FIG. 9 may be considered.
  • the CSI shall have a common set of reporting bands set in the reporting settings and band settings set for the multiple (aggregated) NZP CSI-RS resource settings (for channel and / or interference measurement) It can be measured / reported for the band to which it belongs.
  • the UE can measure / report CSI for a band corresponding to the common band in the example of FIG.
  • a configuration unit such as the above-described set of resources, a subset of resources, and the like may be the same as the resource set in the CSI framework set for the CSI report.
  • parameter groups may be set and different alternatives may be applied for each parameter group, such as setting some parameters to default values and specifying remaining resources to be reference resources.
  • the (partial) set of the above-mentioned resources may be given different setting / signaling depending on the DMRS type. More specifically, the number of aggregated ports in a subset of the resources set according to the DMRS type can be set differently.
  • Two types of DMRS can be configured in the NewRat, each of which has the following characteristics.
  • DMRS type 1 DMRS type 2
  • Maximum number of ports 8 12 Maximum number of terminals in MU case 4
  • the maximum number of MU layers depends on the DMRS type set for the UE, and thus, determining the maximum number of C-ports (I-ports) by assuming CIMR / PIMR is used to simulate the actual interference situation It is advantageous. Therefore, the maximum number of ports can be determined as follows.
  • the base station can separately set up a (partial) set of resources to be used when a (partial) set of specific resources is used for the measurement of the port-wise channel and when it is used for general channel measurement. At this time, the following method can be used.
  • Alt 1 If the total number of ports of resources contained in a subset of specific resources exceeds 4, the terminal does not expect the subset of resources to be set to C-port.
  • Alt 2 When the total number of ports of a resource contained in a subset of resources exceeds 4 and a subset of those resources is set as a C-port, only up to 4 ports of the subset of the resources are used as C-ports The rest is not measured.
  • the aggregated resources of a subset of each resource can be configured to be broken up into 4-port units.
  • a subset of resources with a total of six ports can be configured as a two-port resource, a two-port resource, and a two-port resource, The same setting is not possible.
  • Alt 3 The total number of ports of a resource contained in a subset of each resource is limited to a maximum of four.
  • the operation may be limited due to the maximum number of ports defined.
  • the total number of aggregated ports (number of C-ports + number of I-ports) in the (partial) set of resources in CIMR is 8 for DMRS type 1 and 12 for DMRS type 2.
  • the BS can set a subset of different resources according to the DMRS type. To do this, you can use the following method.
  • Alt 1 Set (partial) set of separate resources according to DMRS type
  • Alt 3 A set of up to 8-total port resources / subset of resources / resource group to be used in common for DMRS type 1 and DMRS type 2, a subset or resource of additional resources used only for DMRS type 2 Set the group separately.
  • the total number of ports in a subset or resource group of these resources may be set to be equal to or less than four.
  • the configuration for DMRS type 1 can be reused as much as possible.
  • the subset or resource group of the corresponding resource operates in the same manner as the case where the DMRS type 1 is set and the IMR is not set for the corresponding resource.
  • a given set of resources can be set to C-port if PMI and RI feedback are not used. For similar situations, the following approach can be considered.
  • the (partial) set of resources specified by that measurement trigger shall be considered an NZP CSI-RS based IMR.
  • the measurement is a C-port, i.e., a subset of resources set with channel measurements, and a precoded CSI-RS It is regarded as corresponding to and measured.
  • the (partial) set of resources specified by that measurement trigger is considered to be an NZP CSI-RS based IMR.
  • the CSI report When the CSI report is designated as PUCCH report, it is considered to transmit it to the DL DCI. Therefore, the corresponding measurement trigger also needs to be transmitted to the same DL DCI.
  • the resource specified by that trigger is an NZP CSI-RS-based IMR and is considered a C-port and an I-port on a per-port basis (depending on configuration / signaling) CSI can be measured.
  • the (partial) set of resources and / or resources designated by the DCI field corresponding to the measurement trigger in the above two schemes can be considered as an NZP CSI-RS based IMR.
  • the transmitting apparatus 10 is a block diagram illustrating components of a transmitting apparatus 10 and a receiving apparatus 20 that perform embodiments of the present invention.
  • the transmitting apparatus 10 and the receiving apparatus 20 may include a transmitter / receiver 13, 23 capable of transmitting or receiving radio signals carrying information and / or data, signals, messages and the like, A memory 12, 22 for storing various information, a transmitter / receiver 13, 23 and a memory 12, 22, so as to control the component, (11, 21) configured to control the memory (12, 22) and / or the transmitter / receiver (13, 23) to perform at least one of the embodiments of the present invention.
  • the memories 12 and 22 may store a program for processing and controlling the processors 11 and 21, and may temporarily store the input / output information.
  • the memories 12 and 22 can be utilized as buffers.
  • Processors 11 and 21 typically control the overall operation of the various modules within the transmitting or receiving device. In particular, the processors 11 and 21 may perform various control functions to perform the present invention.
  • the processors 11 and 21 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like.
  • the processors 11 and 21 may be implemented by hardware or firmware, software, or a combination thereof.
  • firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention.
  • the firmware or software may be contained within the processors 11, 21 or may be stored in the memories 12, 22 and driven by the processors 11,
  • the processor 11 of the transmission apparatus 10 performs predetermined coding and modulation on signals and / or data scheduled to be transmitted from the scheduler connected to the processor 11 or the processor 11, And transmits it to the transmitter / receiver 13.
  • the processor 11 converts a data stream to be transmitted into K layers through demultiplexing, channel coding, scrambling, modulation, and the like.
  • the encoded data stream is also referred to as a code word and is equivalent to a transport block that is a data block provided by the MAC layer.
  • One transport block (TB) is encoded into one codeword, and each codeword is transmitted to the receiving device in the form of one or more layers.
  • the transmitter / receiver 13 may comprise an oscillator.
  • Transmitter / receiver 13 may include Nt (where Nt is a positive integer greater than one) transmit antennas.
  • the signal processing procedure of the receiving apparatus 20 is configured in reverse to the signal processing procedure of the transmitting apparatus 10.
  • the transmitter / receiver 23 of the receiving device 20 receives the radio signal transmitted by the transmitting device 10.
  • the transmitter / receiver 23 may include Nr receive antennas, and the transmitter / receiver 23 may frequency down-convert each of the signals received through the receive antenna to reconstruct the baseband signal do.
  • Transmitter / receiver 23 may include an oscillator for frequency downconversion.
  • the processor 21 may perform decoding and demodulation of the radio signal received through the reception antenna to recover data that the transmission apparatus 10 originally intended to transmit.
  • the transmitter / receivers 13, 23 have one or more antennas.
  • the antenna may transmit signals processed by the transmitters / receivers 13 and 23 to the outside, receive radio signals from the outside, and transmit the processed signals to the transmitter / receiver 13 and 23 under the control of the processors 11 and 21 in accordance with an embodiment of the present invention. (13, 23).
  • Antennas are sometimes referred to as antenna ports.
  • Each antenna may correspond to one physical antenna or may be composed of a combination of more than one physical antenna element. The signal transmitted from each antenna can not be further decomposed by the receiving apparatus 20.
  • a reference signal (RS) transmitted in response to the antenna defines the antenna viewed from the perspective of the receiving apparatus 20 and indicates whether the channel is a single radio channel from one physical antenna, Enables the receiving device 20 to channel estimate for the antenna regardless of whether it is a composite channel from a plurality of physical antenna elements. That is, the antenna is defined such that a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is transmitted.
  • a transmitter / receiver supporting a multi-input multi-output (MIMO) function for transmitting and receiving data using a plurality of antennas, it can be connected to two or more antennas.
  • the operation of the above-described proposal or invention may be achieved by a computer (a generic concept including a system on chip (SoC) or (micro) processor, etc.) Or may be provided in the form of a computer-readable storage medium or a computer program product storing or containing the code, and the scope of the present invention is not limited to storing or storing the code or the code, Readable storage medium or computer program product.
  • SoC system on chip
  • micro micro
  • terminal is a generic term used interchangeably with a device having mobility such as a mobile station (MS), a user equipment (UE) , eNB (evolved NodeB), ng-eNB (next generation eNode B), gNB (next generation NodeB), and the like.
  • MS mobile station
  • UE user equipment
  • eNB evolved NodeB
  • ng-eNB no generation eNode B
  • gNB next generation NodeB
  • the UE or the UE operates as the transmitting apparatus 10 in the uplink and operates as the receiving apparatus 20 in the downlink.
  • the base station, the eNB, the ng-eNB, or the gNB operate as the receiving apparatus 20 in the uplink and the transmitting apparatus 10 in the downlink.
  • the transmitting apparatus and / or the receiving apparatus may perform at least one of the embodiments of the present invention described above or a combination of two or more embodiments.
  • a terminal comprising: a transmitter and a receiver; And a processor configured to control the transmitter and the receiver, wherein the port-wide channel and the interference measurement resource correspond to independent interference assumptions for each port, And a terminal-group specific channel and interference measurement resources, and to measure channel and interference for each port in the port-wise channel and the interference measurement resource, and report the measurement result.
  • the UE-group specific channel and interference measurement resources may be used to correct a previously reported channel quality indicator (CQI).
  • CQI channel quality indicator
  • the UE-group specific channel and interference measurement resources may be set semi-persistently and may be enabled or disabled by signaling from the network.
  • the processor can perform the measurement by assuming that all the ports of the UE-group specific channel and the interference measurement resource are ports through which the interference signal is transmitted .
  • the settings related to the UE-group specific channel and interference measurement resources may include a port for channel measurement and an index or number of ports for interference measurement and may be associated with the UE-
  • the setting may be included in an aperiodic reference signal indication for the resource.
  • the port of the UE-group specific channel and the interference measurement resource corresponds one-to-one with the demodulation reference signal port
  • the demodulation reference signal port for the UE corresponds to a port for channel measurement, It can be used as a port.
  • the settings related to the UE-group specific channel and interference measurement resources may include information on the number of co-scheduled multi-user (MU) layers or the total number of MU layers.
  • MU co-scheduled multi-user
  • the present invention can be used in a wireless communication device such as a terminal, a relay, a base station, and the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

Selon un mode de réalisation de la présente invention, un procédé de mesure de canal utilisant un canal par port et une ressource de mesure d'interférence et rapportant dans un système de communication sans fil est exécuté par un terminal et peut comprendre les étapes suivantes : réception d'une configuration relative à un canal par port et d'une ressource de mesure d'interférence, le canal par port et la ressource de mesure d'interférence correspondant à une hypothèse d'interférence indépendante spécifique à un port et comprenant un canal spécifique au groupe terminal et une ressource de mesure d'interférence ; et mesure d'un canal spécifique à un port et d'une interférence dans le canal par port et la ressource de mesure d'interférence, et rapport d'un résultat de mesure.
PCT/KR2018/011672 2017-10-02 2018-10-02 Procédé de mesure de canal ou d'interférence dans un système de communication sans fil et appareil associé WO2019070094A1 (fr)

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US62/581,021 2017-11-02
US201762587541P 2017-11-17 2017-11-17
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WO2023160338A1 (fr) * 2022-02-22 2023-08-31 华为技术有限公司 Procédé et appareil de communication

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WO2023160338A1 (fr) * 2022-02-22 2023-08-31 华为技术有限公司 Procédé et appareil de communication

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