[go: up one dir, main page]

WO2018174309A1 - Procédé de contrôle de l'interférence intercellulaire dans un système de communication sans fil et dispositif correspondant - Google Patents

Procédé de contrôle de l'interférence intercellulaire dans un système de communication sans fil et dispositif correspondant Download PDF

Info

Publication number
WO2018174309A1
WO2018174309A1 PCT/KR2017/003047 KR2017003047W WO2018174309A1 WO 2018174309 A1 WO2018174309 A1 WO 2018174309A1 KR 2017003047 W KR2017003047 W KR 2017003047W WO 2018174309 A1 WO2018174309 A1 WO 2018174309A1
Authority
WO
WIPO (PCT)
Prior art keywords
srs
uplink
zero power
cell
terminal
Prior art date
Application number
PCT/KR2017/003047
Other languages
English (en)
Korean (ko)
Inventor
최국헌
김규석
안민기
이길봄
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to PCT/KR2017/003047 priority Critical patent/WO2018174309A1/fr
Publication of WO2018174309A1 publication Critical patent/WO2018174309A1/fr

Links

Images

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for controlling inter-cell interference in a wireless communication system.
  • New RAT When a new radio access technology (RAT) system is introduced, as more communication devices require larger communication capacities, there is a need for improved mobile broadband communication compared to the existing RAT.
  • massive MTC Machine Type Communications
  • massive MTC Machine Type Communications
  • eMBB enhanced mobile broadband communication
  • massive MTC massive MTC
  • URLLC Ultra-Reliable and Low Latency Communication
  • An object of the present invention is to provide a method for controlling interference between cells by a base station in a wireless communication system.
  • Another object of the present invention is to provide a base station for controlling inter-cell interference in a wireless communication system.
  • a method for controlling inter-cell interference by a base station in a wireless communication system comprises: determining at least one victim terminal according to a predetermined method among terminals in a cell to which the base station belongs; Transmitting information related to a zero power sounding reference signal (SRS) region for the determined at least one victim terminal to an adjacent base station; And transmitting control information for uplink data transmission in a resource corresponding to the zero power SRS region to the determined at least one victim terminal.
  • SRS sounding reference signal
  • the predetermined scheme is a first scheme for measuring signal-to-interference-plus-noise ratio (SINR) using subframes configured for UL beam refinement, and the uplink And a second method of measuring the SINR using only subframes configured for beam correction or a third method of measuring the SINR using subframes other than the subframes configured for uplink beam correction. .
  • SINR signal-to-interference-plus-noise ratio
  • the information related to the zero power SRS region may include information indicating whether to activate the zero power SRS, and whether to activate the zero power SRS is the first, second and third methods. Can be determined very much.
  • the information related to the zero power SRS region may further include information indicating a position of the zero power SRS region for the antenna port group allocated to each of the at least one victim terminal.
  • the zero power SRS region may be allocated to different frequency bands for each antenna port belonging to the antenna port group.
  • a base station for controlling inter-cell interference in a wireless communication system includes a processor configured to determine at least one victim terminal according to a predetermined method among terminals in a cell to which the base station belongs; Transmitting information related to a zero power SRS (sounding reference signal) region for the determined at least one victim terminal to an adjacent base station, and transmitting control information for uplink data transmission on a resource corresponding to the zero power SRS region; It may include a transmitter configured to transmit to at least one victim terminal.
  • SRS sounding reference signal
  • the predetermined scheme is a first scheme for measuring signal-to-interference-plus-noise ratio (SINR) using subframes configured for UL beam refinement, and the uplink And a second method of measuring the SINR using only subframes configured for beam correction or a third method of measuring the SINR using subframes other than the subframes configured for uplink beam correction. .
  • SINR signal-to-interference-plus-noise ratio
  • the information related to the zero power SRS region may include information indicating whether to activate the zero power SRS. Whether to activate the zero power SRS may be determined for each of the first, second and third methods.
  • the information related to the zero power SRS region may further include information indicating a position of the zero power SRS region for the antenna port group allocated to each of the at least one victim terminal.
  • the performance of a communication system can be improved by allocating resources efficiently by mitigating interference between uplink cells on an NR structure.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • FIG. 2 is a diagram illustrating a structure of a subframe in which a data channel and a control channel are TDM.
  • 3 is a diagram illustrating a hybrid CSI-RS (wideband, sub-band) structure for supporting various services in New RAT.
  • FIG. 4 is a diagram illustrating Localized URS (Uplink RS) unit bandwidth (BW) definition and placement (including a transmission comb).
  • URS Uplink RS
  • BW unit bandwidth
  • FIG. 5 is a diagram illustrating interference occurrence according to various resource structures (localized SRS + xPUCCH, xPUCCH only, and xSRS only structures) configuration.
  • 6 is an exemplary diagram for describing interference due to different uplink resource configuration between cells.
  • FIG. 7 is a diagram illustrating a structure between 3GPP NR multiple numerology.
  • FIG. 8 is a diagram illustrating an interference problem according to different multi-numerologies configuration, (a) is a diagram illustrating uplink inter-cell interference between different numerologies, and (b) is a diagram illustrating another multi-numerologies configuration between cells.
  • FIG. 10 is an exemplary diagram for describing another cell interference when tracking a UE transmission beam
  • FIG. 11 is an exemplary diagram for explaining SRS transmission and interference when UE 2 (UE 2) of FIG. 7 is beam tracking.
  • FIG. 12 is a diagram illustrating a CSI reporting method.
  • FIG. 13 is a diagram illustrating uplink transmission of UEs and arrangement of DMRSs.
  • FIG. 14 is a diagram illustrating a periodic SRS transmitted for uplink beam refinement.
  • 15 is a diagram illustrating setting and utilization of a zero power SRS region.
  • 16 exemplarily shows Zero Power SRS transmission subframes / symbols.
  • 17 is a diagram illustrating a Zero Power SRS resource region for a victim terminal.
  • 18 is a diagram illustrating a procedure for transmitting a zero power SRS.
  • FIG. 19 is a diagram illustrating a Comb for IM (6 RB (12 RE per RB configuration example)) in SRS allocation.
  • 20 is a diagram illustrating a zero power zone for IM when SRS is allocated.
  • 21 illustrates another ZP zone according to each uplink subframe for IM.
  • 22 is a diagram illustrating the number of multiple ZP zones in an SRS band.
  • FIG. 23 is a diagram illustrating sequence configuration and physical resource mapping in consideration of a ZP zone.
  • FIG. 24 is a diagram illustrating ZP SRS resource allocation for each port group in cell B for UE 1 of cell A.
  • 25 is a diagram illustrating variable allocation of a ZP zone according to UE capability.
  • FIG. 26 is a diagram illustrating a minimum unit uplink resource (n X m) for inter-cell interference measurement.
  • 27 is a diagram illustrating a method of indicating an interference measurement region.
  • FIG. 28 is a diagram exemplarily illustrating a procedure for transmission in a ZP SRS region in a New RAT system.
  • a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like.
  • the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
  • UE user equipment
  • MS mobile station
  • AMS advanced mobile station
  • AP Access Point
  • a terminal or a user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
  • the information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • the wireless communication system 100 may include one or more base stations and / or one or more terminals. .
  • the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver ( 190, a symbol demodulator 195, and a receive data processor 197.
  • the terminal 110 transmits (Tx) the data processor 165, the symbol modulator 170, the transmitter 175, the transmit / receive antenna 135, the processor 155, the memory 160, the receiver 140, and the symbol. It may include a demodulator 155 and a receive data processor 150.
  • the base station 105 and the terminal 110 are provided with a plurality of transmit and receive antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support a multiple input multiple output (MIMO) system. In addition, the base station 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.
  • MIMO multiple input multiple output
  • SU-MIMO single user-MIMO
  • MU-MIMO multi-user-MIMO
  • the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
  • the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
  • the symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter 125.
  • each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero.
  • pilot symbols may be sent continuously.
  • the pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.
  • Transmitter 125 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency upconverts) the analog signals to provide a wireless channel. Generates a downlink signal suitable for transmission via the transmission antenna 130, the transmission antenna 130 transmits the generated downlink signal to the terminal.
  • the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140.
  • Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
  • the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
  • the symbol demodulator 145 also receives a frequency response estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
  • the processing by symbol demodulator 145 and receiving data processor 150 is complementary to the processing by symbol modulator 120 and transmitting data processor 115 at base station 105, respectively.
  • the terminal 110 is on the uplink, and the transmit data processor 165 processes the traffic data to provide data symbols.
  • the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
  • the transmitter 175 receives and processes a stream of symbols to generate an uplink signal.
  • the transmit antenna 135 transmits the generated uplink signal to the base station 105.
  • an uplink signal is received from the terminal 110 through the reception antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
  • the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
  • the received data processor 197 processes the data symbol estimates to recover the traffic data transmitted from the terminal 110.
  • Processors 155 and 180 of the terminal 110 and the base station 105 respectively instruct (eg, control, coordinate, manage, etc.) operations at the terminal 110 and the base station 105, respectively.
  • Respective processors 155 and 180 may be connected to memory units 160 and 185 that store program codes and data.
  • the memory 160, 185 is coupled to the processor 180 to store the operating system, applications, and general files.
  • the processors 155 and 180 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like.
  • the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
  • the firmware or software configured to be may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processors 155 and 180.
  • the layers of the air interface protocol between the terminal and the base station between the wireless communication system (network) are based on the lower three layers of the open system interconnection (OSI) model, which is well known in the communication system. ), And the third layer L3.
  • the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
  • a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
  • the terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.
  • the processor 155 of the terminal and the processor 180 of the base station process the signals and data, except for the function of receiving or transmitting the signal and the storage function of the terminal 110 and the base station 105, respectively.
  • the following description does not specifically refer to the processors 155 and 180.
  • the processors 155 and 180 it may be said that a series of operations such as a function of receiving or transmitting a signal and a data processing other than a storage function are performed.
  • the terminal For Tx beam tracking of the terminal, the terminal needs to transmit the SRS according to each candidate terminal transmission beam (Tx beam). Since SRS transmission according to many beam directions (transmission beam set of UE in all directions) generates a large amount of resource loss, according to the present invention, SRS transmission is flexibly transmitted according to UE change pattern, thereby adaptive UE transmission.
  • Tx beam candidate terminal transmission beam
  • a UE shall transmit Sounding Reference Symbol (SRS) on per serving cell SRS resources based on two trigger types:-trigger type 0: higher layer signaling-trigger type 1: DCI formats 0/4 / 1A for FDD and TDD and DCI formats 2B / 2C / 2D for TDD.
  • SRS Sounding Reference Symbol
  • a UE may be configured with SRS parameters for trigger type 0 and trigger type 1 on each serving cell.
  • SRS parameters are serving cell specific and semi-statically configurable by higher layers for trigger type 0 and for trigger type 1.
  • -Transmission comb as defined in subclause 5.5.3.2 of [3] for trigger type 0 and each configuration of trigger type 1-Starting physical resource block assignment n RRC , as defined in subclause 5.5.3.2 of [3] for trigger type 0 and each configuration of trigger type 1 - duration: single or indefinite (until disabled), as defined in [11] for trigger type 0 - srs-ConfigIndex I sRS for sRS periodicity T sRS and sRS subframe offset T offset, as defined in Table 8.2-1 and Table 8.2-2 for trigger type 0 and SRS periodicity T SRS, 1 , and SRS subframe offset T SRS, 1 , as defined in Table 8.2-4 and Table 8.2-5 trigger type 1-SRS bandwidth B SRS , as defined in subclause 5.5.3.2 of [3] for trigger type 0 and each configuration of trigger type 1-Frequency hopping bandwidth
  • the 2-bit SRS request field [4] in DCI format 4 indicates the SRS parameter set given in Table 8.1-1.
  • a single set of SRS parameters srs-ConfigApDCI-Format0
  • a single common set of SRS parameters srs-ConfigApDCI-Format1a2b2c
  • the SRS request field is 1 bit [4] for DCI formats 0 / 1A / 2B / 2C / 2D, with a type 1 SRS triggered if the value of the SRS request field is set to '1'.
  • a 1-bit SRS request field shall be included in DCI formats 0 / 1A for frame structure type 1 and 0 / 1A / 2B / 2C / 2D for frame structure type 2 if the UE is configured with SRS parameters for DCI formats 0 / 1A / 2B / 2C / 2D by higher-layer signalling.
  • Table 2 below shows a SRS Request Value for trigger type 1 in DCI format 4 in 3GPP LTE / LTE-A system.
  • Table 3 is a table for further explaining the additional information related to the SRS transmission in the 3GPP LTE / LTE-A system.
  • the serving cell specific SRS transmission bandwidths C SRS are configured by higher layers.
  • the allowable values are given in subclause 5.5.3.2 of [3].
  • the serving cell specific SRS transmission sub-frames are configured by higher layers.
  • the allowable values are given in subclause 5.5.3.3 of [3].
  • SRS transmissions can occur in UpPTS and uplink subframes of the UL / DL configuration indicated by the higher layer parameter subframe Assignment for the serving cell.
  • a UE may be configured to transmit SRS on Np antenna ports of a serving cell where Np may be configured by higher layer signalling.
  • Np may be configured by higher layer signalling.
  • a UE configured for SRS transmission on multiple antenna ports of a serving cell shall transmit SRS for all the configured transmit antenna ports within one SC-FDMA symbol of the same subframe of the serving cell.
  • the SRS transmission bandwidth and starting physical resource block assignment are the same for all the configured antenna ports of a given serving cell.
  • a UE not configured with multiple TAGs shall not transmit SRS in a symbol whenever SRS and PUSCH transmissions happen to overlap in the same symbol.
  • TDD serving cell when one SC-FDMA symbol exists in UpPTS of the given serving cell, it can be used for SRS transmission.
  • both can be used for SRS transmission and for trigger type 0 SRS both can be assigned to the same UE.
  • a UE is not configured with multiple TAGs, or if a UE is configured with multiple TAGs and SRS and PUCCH format 2 / 2a / 2b happen to coincide in the same subframe in the same serving cell, -The UE shall not transmit type 0 triggered SRS whenever type 0 triggered SRS and PUCCH format 2 / 2a / 2b transmissions happen to coincide in the same subframe;
  • the UE shall not transmit type 1 triggered SRS whenever type 1 triggered SRS and PUCCH format 2a / 2b or format 2 with HARQ-ACK transmissions happen to coincide in the same subframe;
  • -The UE shall not transmit PUCCH format 2 without HARQ-ACK whenever type 1 triggered SRS and PUCCH format 2 without HARQ-ACK transmissions happen to coincide in the same subframe.
  • the UE shall transmit SRS whenever SRS transmission and PUCCH transmission carrying HARQ-ACK and / or positive SR using shortened format as defined in subclauses 5.4.1 and 5.4.2A of [3] happen to coincide in the same subframe if the parameter ackNackSRS-SimultaneousTransmission is TRUE.
  • a UE not configured with multiple TAGs shall not transmit SRS whenever SRS transmission on any serving cells and PUCCH transmission carrying HARQ-ACK and / or positive SR using normal PUCCH format as defined in subclauses 5.4.1 and 5.4.2A of [3] happen to coincide in the same subframe.
  • the UE shall not transmit SRS whenever SRS transmission instance overlaps with the PRACH region for preamble format 4 or exceeds the range of uplink system bandwidth configured in the serving cell.
  • the parameter ackNackSRS-Simultaneous Transmission provided by higher layers determines if a UE is configured to support the transmission of HARQ-ACK on PUCCH and
  • the cell specific SRS subframes of the primary cell UE shall transmit HARQ-ACK and SR using the shortened PUCCH format as defined in subclauses 5.4. 1 and 5.4.2A of [3], where the HARQ-ACK or the SR symbol corresponding to the SRS location is punctured.
  • This shortened PUCCH format shall be used in a cell specific SRS subframe of the primary cell even if the UE does not transmit SRS in that subframe.
  • the cell specific SRS subframes are defined in subclause 5.5.3.3 of [3].
  • the UE shall use the normal PUCCH format 1 / 1a / 1b as defined in subclause 5.4.1 of [3] or normal PUCCH format 3 as defined in subclause 5.4.2A of [3] for the transmission of HARQ-ACK and SR.Trigger type 0 SRS configuration of a UE in a serving cell for SRS periodicity, T SRS , and SRS subframe offset, T offset , is defined in Table 8.2-1 and Table 8.2-2, for FDD and TDD serving cell, respectively .
  • the periodicity T SRS of the SRS transmission is serving cell specific and is selected from the set ⁇ 2, 5, 10, 20, 40, 80, 160, 320 ⁇ ms or subframes.
  • T SRS For the SRS periodicity T SRS of 2 ms in TDD serving cell, two SRS resources are configured in a half frame containing UL subframe (s) of the given serving cell.
  • TDD serving cell For TDD serving cell, and a UE configured for type 0 triggered SRS transmission in serving cell c, and the UE configured with the parameter EIMTA-MainConfigServCell-r12 for serving cell c, if the UE does not detect an UL / DL configuration indication for radio frame m (as described in section 13.1), the UE shall not transmit trigger type 0 SRS in a subframe of radio frame m that is indicated by the parameter eimta-HarqReferenceConfig-r12 as a downlink subframe unless the UE transmits PUSCH in the same subframe.
  • Trigger type 1 SRS configuration of a UE in a serving cell for SRS periodicity, T SRS, 1 , and SRS subframe offset, T offset, 1 is defined in Table 8.2-4 and Table 8.2-5, for FDD and TDD serving cell, respectively.
  • the periodicity T SRS, 1 of the SRS transmission is serving cell specific and is selected from the set ⁇ 2, 5, 10 ⁇ ms or subframes.
  • a UE configured for type 1 triggered SRS transmission in serving cell c and not configured with a carrier indicator field shall transmit SRS on serving cell c upon detection of a positive SRS request in PDCCH / EPDCCH scheduling PUSCH / PDSCH on serving cell c
  • a UE configured for type 1 triggered SRS transmission in serving cell c and configured with a carrier indicator field shall transmit SRS on serving cell c upon detection of a positive SRS request in PDCCH / EPDCCH scheduling PUSCH / PDSCH with the value of carrier indicator field corresponding to serving cell c .
  • a UE configured for type 1 triggered SRS transmission is not expected to receive type 1 SRS triggering events associated with different values of trigger type 1 SRS transmission parameters, as configured by higher layer signaling, for the same subframe and the same serving cell.
  • the UE shall not transmit SRS in a subframe of a radio frame that is indicated by the corresponding eIMTA-UL / DL-con
  • Table 4 shows a subframe offset configuration (T offset ) and UE-specific SRS periodicity (T SRS ) for trigger type 0 in FDD.
  • Table 5 below shows a subframe offset configuration (T offset ) and a UE-specific SRS periodicity (T SRS ) for trigger type 0 in TDD.
  • SRS Configuration Index I SRS SRS Periodicity (ms) SRS subframe Offset 0 2 0, 1 One 2 0, 2 2 2 1, 2 3 2 0, 3 4 2 1, 3 5 2 0, 4 6 2 1, 4 7 2 2, 3 8 2 2, 4 9 2 3, 4 10-14 5 I SRS -10 15-24 10 I SRS -15 25-44 20 I SRS -25 45-84 40 I SRS -45 85-164 80 I SRS -85 165-324 160 I SRS -165 325-644 320 I SRS -325 645-1023 reserved reserved reserved
  • Table 7 shows k SRS for TDD.
  • Table 8 shows a subframe offset configuration (T offset, 1 ) and UE-specific SRS periodicity (T SRS, 1 ) for trigger type 1 in FDD.
  • Table 9 shows subframe offset configuration (T offset , 1 ) and UE-specific SRS periodicity (T SRS, 1 ) for trigger type 1 in TDD.
  • SRS Configuration Index I SRS SRS Periodicity (ms) SRS subframe Offset 0 reserved reserved One 2 0, 2 2 2 1, 2 3 2 0, 3 4 2 1, 3 5 2 0, 4 6 2 1, 4 7 2 2, 3 8 2 2, 4 9 2 3, 4 10-14 5 I SRS -10 15-24 10 I SRS -15 25-31 reserved reserved reserved
  • FIG. 2 is a diagram illustrating a structure of a subframe in which a data channel and a control channel are TDM.
  • the hatched region represents a downlink control region (that is, a resource region for transmitting a downlink control channel), and a black portion represents an uplink control region (that is, a resource region for transmitting an uplink control channel).
  • an area without an indication may be used for downlink data transmission or may be used for uplink data transmission.
  • the feature of such a structure is that downlink (DL) transmission and uplink (UL) transmission are sequentially performed in one subframe, and can transmit downlink data in a subframe and receive uplink ACK / NACK. As a result, when a data transmission error occurs, the time required for data retransmission is reduced, thereby minimizing latency of final data transmission.
  • a time gap is required for a base station and a UE to switch from a transmission mode to a reception mode or a process from a reception mode to a transmission mode.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the hatched region indicates a transmission region of a physical downlink control channel (eg, a physical downlink control channel (PDCCH)) for transmitting downlink control information (DCI), and the last symbol conveys uplink control information (UCI).
  • a physical downlink control channel eg, Physical Uplink Control CHannel (PUCCH)
  • the DCI which is control information transmitted from the base station to the terminal, includes information about cell configuration that the terminal needs to know, downlink-specific information such as downlink scheduling, and uplink-specific information such as UL grant. Information and the like.
  • the UCI which is control information delivered to the base station, may include a HARQ ACK / NACK report for downlink data, a CSI report for downlink channel state, and a scheduling request (SR).
  • SR scheduling request
  • an area without an indication may be used as a data channel (eg, a physical downlink shared channel) for downlink data transmission, or a data channel (eg, uplink data transmission).
  • a data channel eg, a physical downlink shared channel
  • a data channel eg, uplink data transmission
  • Physical Uplink Shared CHannel (PUSCH) may be used.
  • the feature of this structure is that downlink transmission and uplink transmission are sequentially performed in one subframe, so that a base station sends downlink data in a subframe, and transmits HARQ ACK / NACK signal for the downlink data from a terminal. Can be received. As a result, when a data transmission error occurs, the time required for data retransmission is reduced, thereby minimizing latency of final data transmission.
  • a time gap is required for a base station and a terminal to switch from a transmission mode to a reception mode or a process of switching from a reception mode to a transmission mode.
  • some OFDM symbols at the time of switching from DL to UL in a self-contained subframe structure are set to guard period (GP).
  • each section is represented in the temporal order within the subframe.
  • New RAT system requirements will be an environment where multiple measurement requirements and multiple services that require different control information transmissions coexist.
  • the present invention proposes a resource allocation method for measuring in order to mitigate interference between uplink cells on a New RAT structure.
  • 3 is a diagram illustrating a hybrid CSI-RS (wideband, sub-band) structure for supporting various services in New RAT.
  • heterogeneous CSI-RSs need to be formed in a wideband and sub-band structure from a downlink perspective. Therefore, if the structure of FIG. 3 is regarded as one of the requirements of the New RAT, the uplink resource is also likely to be corresponding thereto.
  • FIG. 4 is a diagram illustrating Localized URS (Uplink RS) unit bandwidth (BW) definition and placement (including a transmission comb).
  • URS Uplink RS
  • BW unit bandwidth
  • the uplink SRS (which can be expressed as xSRS in New RAT) structure, not only the whole band transmission of the terminal, but also localized or distributed forms can be transmitted on one symbol according to other service requirements.
  • the SRS also needs to consider a structure of multiplexing with other uplink channels (eg, uplink control channels).
  • the entire band can be divided into four Localized SRS unit bandwidths.
  • ZC Zadoff-Chu
  • SC pseudo random
  • New RAT system is expected to increase base station and terminal requirements as follows.
  • -Terminal TRP increase Request for increased Sounding RS dimensioning (port, Cyclic Shift (CS), Orthogonal Cover Code (OCC), Transmission Comb, etc.)
  • Advanced transceiver Requires an advanced transceiver structure for enhanced interference measurement reporting (network assistant interference control).
  • UL Beam tracking A structure for UL Beam tracking is required when not only the downlink but also the beam tracking of the uplink channel is required (multi-symbol-wise SRS transmission).
  • Channel reciprocity A structure is needed when the reciprocity between the downlink channel and the uplink channel is established or not (UL SRS support for downlink channel estimation is required).
  • uplink inter-cell interference received by a target terminal is transmitted to neighboring cells (especially prepared cells: cells of a specific terminal) transmitted to a resource location such as a resource allocated to a serving cell. It is largely caused by UE Tx beamforming in cells having strong RSRP during RS measurement.
  • the information necessary for controlling such interference is UE-specific information (ie, beamforming pattern information of a neighboring cell terminal directed to the serving cell (information that the serving base station (or serving cell) can use to extract the receiving RSRP of the terminal)), Site-specific information (ie, information indicating the Tx beam direction of neighboring cell terminals that cause terminals inside prepared cells to interfere with the target terminal in a serving cell), and resource-specific information (ie, Orthogonality of resources that interfere with allocated resources). Therefore, the serving cell needs to receive the terminal-specific information / location-specific information / resource-specific information from neighboring cells for interference control.
  • UE-specific information ie, beamforming pattern information of a neighboring cell terminal directed to the serving cell (information that the serving base station (or serving cell) can use to extract the receiving RSRP of the terminal)
  • Site-specific information ie, information indicating the Tx beam direction of neighboring cell terminals that cause terminals inside prepared cells to interfere with the target terminal in a serving cell
  • resource-specific information
  • FIG. 5 is a diagram illustrating interference occurrence according to various resource structures (localized SRS + xPUCCH, xPUCCH only, and xSRS only structures) configuration.
  • FIG. 5 illustrates that the UE is allocated the same resource region from each serving cell (serving cell, prepared cell 0, prepared cell M).
  • serving cell serving cell, prepared cell 0, prepared cell M in FIG. 5
  • different channels or usages localized SRS in serving cell, xPUCCH in prepared cell 0, whole band SRS in prepared cell M
  • assigning the resource of it can be seen that a problem may occur that the channel or resource orthogonality is not established by generating a sequence having a different length when generating each channel.
  • each base station or cell needs to know a set of sequences of all different lengths in advance, and prepared cells are prepared cells. It is necessary to accurately inform the serving cell of information (location where the channel is generated and mapped to the physical resource) on the channel region where interference occurs. Meanwhile, in the case of a channel having the same length, interference can be easily mitigated by a method designed from the perspective of channel orthogonality among the methods for mitigating inter-cell interference.
  • 6 is an exemplary diagram for describing interference due to different uplink resource configuration between cells.
  • inter-cell interference between the SRS and the xPUCCH may occur according to the configuration of the SRS in cell A and the physical uplink channel (for example, referred to as xPUCCH) in cell B.
  • the following method is performed.
  • xPUCCH formats 1, 1a, and 1b and SRS are designed using Zadoff Chu (ZC) sequences.
  • u for setting the root of the ZC sequence is set for each channel (SRS, xPUCCH) using a different group hopping method.
  • each base station can detect each channel through ZC sequence detection between the SRS and the xPUCCH even in the inter-cell interference between the SRS and the xPUCCH.
  • this is a method that can be used by other channels for a sequence that satisfies orthogonality, but especially when an SRS and a signal generation method overlap with another channel such as an xPUCCH format (eg, xPUCCH format 2), Inter-cell interference may occur, resulting in performance degradation.
  • an xPUCCH format eg, xPUCCH format 2
  • FIG. 7 is a diagram illustrating a structure between 3GPP NR multiple numerology.
  • RBs for different numerologies should be placed on a fixed grid.
  • RB grids are defined as subset / superset as nested manner of 15KHz subcarrier spacing RB grid.
  • the frequency domain multiplexing case is FFS.
  • Allow control channels for the start / end symbols of the mini-slot (both or either)
  • the smallest mini-slot is the smallest scheduling unit (FFS, number of symbols)
  • FFS NR needs to determine whether slots or mini-slots support coexisting structures
  • FIG. 8 is a diagram illustrating an interference problem according to different multi-numerologies configuration, (a) is a diagram illustrating uplink inter-cell interference between different numerologies, and (b) is a diagram illustrating another multi-numerologies configuration between cells.
  • the beam sweeping may be performed by measuring a reference signal received power (RSRP) of the BRS as the Rx beam direction of the UE changes in each BRS (beam reference signal) using the BRS.
  • RSRP reference signal received power
  • the reciprocity of the Tx / Rx beam pair for downlink ie, base station transmit beam / terminal receive beam pair and terminal transmit beam / base station receive beam
  • the obtained transmit / receive beam pair can be applied to uplink.
  • the uplink case may use SRS.
  • the SRS corresponding to the entire transmission beam ID of each terminal should be transmitted. This means that a physical uplink shared channel (PUSCH) transmission interval becomes smaller according to SRS transmission, and impairs uplink throughput performance.
  • PUSCH physical uplink shared channel
  • the SRS transmission area increases.
  • the number of SRS transmissions for fixed UE transmission candidate beams is fixedly set in a higher layer.
  • the base station may inform the number of SRS transmission of the terminal transmission candidate beams fixed by the higher layer signal (RRC signal, etc.)).
  • RRC signal higher layer signal
  • FIG. 10 is an exemplary diagram for describing another cell interference when tracking a UE transmission beam
  • FIG. 11 is an exemplary diagram for explaining SRS transmission and interference when UE 2 (UE 2) of FIG. 7 is beam tracking.
  • the uplink candidate beam transmits the SRS with a beam ID (beam ID) that greatly interferes with another cell (
  • the SRS is transmitted in a full bandwidth in a beamformed state, and an uplink control channel (e.g., xPUCCH) or an uplink data channel (e.g., in an uplink of a cell subjected to the interference at that timing) If xPUSCH) is transmitted, the SRS in the uplink channel causes large inter-ell interference as shown in FIG. 11, thereby degrading reception performance.
  • an xPUSCH (k, l) resource of UE 1 (UE 1) received by the serving base station may be represented by Equation 1 below. However, the channel is assumed to be AWGN.
  • an SRS for beam tracking of UE 2 may be transmitted over the entire band in a corresponding symbol.
  • Uplink control is performed by UE 1 or UE 3 in the corresponding symbol. If a channel or uplink data channel transmission is transmitted, the interference is increased by the SRS of the terminal 2 in the corresponding symbol.
  • the terminal For Tx beam tracking of the terminal, the terminal needs to transmit the SRS according to each candidate Tx beam. As the number of candidate Tx beams of the UE increases, the number of SRS symbols increases due to repetitive SRS transmission for beam tracking. Accordingly, not only the serving cell but also adjacent cells may have different frame structures. In particular, a phenomenon in which an SRS channel strongly interferes with another cell during Tx beam tracking of a terminal in uplink occurs.
  • interference measurement is to measure inter-cell interference using CRS (Cell-specific RS) or CSI-RS or ZP (Zero Power) -CSI RS.
  • CRS Cell-specific RS
  • CSI-RS Cell-specific RS
  • ZP Zero Power
  • ABS almost blank subframe
  • the LTE system reference 200ms for the DeModulation Reference Signal (DM-RS) portion is removed and averaged to calculate the RSRP and RSSI, RRM.
  • DM-RS DeModulation Reference Signal
  • ABS status is first obtained for the operation of ABS (Almost black subframe).
  • the UE measures the RSRP and SINR of the CRS (cell-specific RS) portion transmitted by the BS, and the UE measures CQI (Channel Quality). Information).
  • This CQI feedback is received for a certain interval (ie 50ms) and through processing of these CQI feedbacks (eg, average And so on) If is below a certain threshold, the terminal reporting the CQI processing is defined as the victim terminal.
  • the serving cell activates ABS status in the adjacent cell. Therefore, neighboring cells allocate resources to ABS configuration having a predetermined pattern.
  • Bits indicating the two sets (bitmap indicating the subframe in which ABS is transmitted) and the ABS subset for measurement, as the aggressor cell is the victim cell Map) is sent via the X2 interface. Through the X2 interface, the aggressor cell can share information with the victim cell.
  • the serving base station may inform the victim terminal (the terminal affected by the interference) of the subframe set information.
  • There are two subframe sets (a subframe set for RLF and RRM and a subframe set for CSI reporting).
  • the subframe set for RLF (radio link failure) and RRM (radio resource management) is a subframe set for RLF and RRM determination.
  • the subframe set is relatively static and may be set to a long term.
  • the subframe set for CSI reporting indicates a CSI type for ABS and non-ABS, and a reporting subframe for CSI type for ABS of Aggressor cell 1 and ABS of aggressor cell 2.
  • FIG. 12 is a diagram illustrating a CSI reporting method.
  • the subframes for the CSI types may be set so as not to overlap.
  • FIG. 12 (a) is for periodic CSI reporting.
  • the subframe set (subframe # 0) associated with each type is illustrated.
  • periodic CSI reporting is performed in subframe # n + 3.
  • RRM measurement for use in higher layers such as Layer 3 (L3) should measure RSRP.
  • This method usually requires a measurement period of about 200ms.
  • the UE measures the CRS and the like for a specific period, and in the case of ABS, the measurement minimum length is a subframe length and is processed by a method of average out the CRS in the subframe.
  • the frequency resources allocated to each service are also different, and the amount of interference per symbol may vary due to the beam sweeping per uplink symbol when uplink interference measurement is performed in a situation where UL beam sweeping is introduced. have. For this reason, it is not desirable to apply the existing interference measurement method to the New RAT uplink. That is, a method for measuring uplink interference per symbol and per sub-band is needed.
  • the present invention describes the New RAT UL ICIC method. More specifically, the present invention proposes a method for reducing uplink interference when the channel level reciprocity and the beam level reciprocity do not match.
  • FIG. 13 is a diagram illustrating uplink transmission of UEs and arrangement of DMRSs.
  • FIG. 13 (a) illustrates a basic uplink transmission structure
  • FIG. 13 (b) illustrates removing base station DMRS reception through existing DMRS information.
  • the uplink DMRS portion and the SRS portion may be configured in a pattern promised between the base station and the terminal. That is, the base station and the terminal also share information such as SRS sequence generation method, resource location.
  • the uplink interference measurement refers to measuring interference coming from another cell in the uplink data region. As shown in FIG. 13A, DMRSs are generally mapped in the uplink data region. Accordingly, in the basic interference measurement of the uplink, as shown in (b) of FIG. 13, the base station removes the DMRS portion received by the base station and then averages the powers of the removed region to measure the average uplink interference.
  • the present invention proposes a measurement and resource allocation method for mitigating uplink inter-cell interference (ICI) on a New RAT structure.
  • ICI uplink inter-cell interference
  • the first embodiment defines a victim terminal of a serving cell in consideration of (or using) an uplink beam refinement region.
  • RSRP and SINR are measured for a DMRS part for a specific period. If the subframe indexes for performing uplink beam refinement are shared with each other through configuration with neighboring cells, the DMRS portion of subframes for uplink beam refinement is not considered for average uplink interference measurement. Do not.
  • FIG. 14 is a diagram illustrating a periodic SRS transmitted for uplink beam refinement.
  • the subframe index not considered for the uplink beam refinement is ⁇ 0,4,6,8,10,14,16,18 ⁇
  • the serving cell is previously determined by the neighboring cells and the uplink beam refinement.
  • Information about subframe indexes that are not considered for the purpose is shared through the X2 interface.
  • the serving cell measures SINR and DMRS reception power for a specific period (configured in the upper layer) for DMRSs of corresponding subframes, and defines a terminal whose measured average SINR is lower than a threshold of SINR as a victim terminal.
  • the average for the terminal with index k , updated SINR Etc. may be considered. here Is a sequential DMRS counting index.
  • DMRS reception power and SINR are measured for a specific period for all subframes, and average or updated SINR is measured using the above-described interference measurement method.
  • a terminal whose measured SINR is lower than a threshold of SINR is defined as a victim terminal when considering uplink beam refinement.
  • the serving cell is activated / deactivation of the Zero Power SRS (ZP) region of the neighboring cell for each victim classification type for the victim terminals defined as in the first embodiment and Table 11. You can decide whether or not.
  • a branch eg, flag
  • the serving cell transmits information related to the location of the zero power area to the adjacent cell through the X2 interface.
  • the SRS considering the Zero Power SRS is transmitted to the SRS transmission timing of the adjacent cells.
  • the purpose of allocating a zero power region to transmission resources of SRSs is for precise uplink interference measurement when uplink data of another cell is transmitted to a resource corresponding to an uplink resource region of a serving cell to which the SRS is transmitted. It appears mainly when SRS repetitive transmission due to uplink beam refinement.
  • uplink data may be transmitted in another cell at the SRS transmission resource position in the serving cell. Therefore, since the serving cell knows the zero power region of another cell in advance, it allocates resources of the victim terminal to the zero power region of the other cell.
  • Table 12 is an exemplary table indicating whether or not to activate the Zero Power SRS region of the neighbor cell when SRS transmission of the victim terminal in the serving cell. As described above, whether to activate the ZP SRS may be determined for each type of victim classification.
  • 15 is a diagram illustrating setting and utilization of a zero power SRS region.
  • a Zero Power SRS (or SRS ZP zone) zone is allocated to a part of SRS transmission resources of Cell B.
  • Cell B may transmit information on a Zero Power SRS region (or SRS ZP zone) to an adjacent cell (Cell A) through an X2 interface.
  • Cell A is for victim terminal of index k (victim k terminal), which is a terminal that receives interference from cell B on resources corresponding to Zero Power SRS zone of cell B based on the received information about the zero power SRS zone of cell B.
  • Resources for uplink data transmission may be allocated.
  • cell B provides information on a zero power SRS region to neighboring cell (s) through an X2 interface and the like
  • uplink beam refinement is performed in neighboring cell (s).
  • the neighboring cell (s) transmits the zero power SRS to the terminals in the neighboring cell (s) on the resource corresponding to the zero power SRS transmission resource location based on the information on the location of the zero power SRS transmission resource in the received serving cell.
  • the serving cell is in the cell A resource may be allocated to the UE to transmit uplink data in the Zero Power SRS region.
  • neighboring cells can also perform interference measurements coming from the serving cell through its Zero Power SRS region.
  • 16 exemplarily shows Zero Power SRS transmission subframes / symbols.
  • the base station activates the ZP SRS region and transmits the relevant information to the victim terminal.
  • the related information may be transmitted through DCI or piggybacked to PDSCH, and the related information may include the following items.
  • ZP activation flag 0: deactivation, 1: activation
  • the relevant symbol index may be set by the base station according to the zero power resource allocation requirement according to the transmission (Tx) beam of the terminal during uplink beam refinement.
  • 17 is a diagram illustrating a Zero Power SRS resource region for a victim terminal.
  • the SRS is composed of a plurality of short sequences, it may be represented by an index of a unit consisting of a short sequence.
  • the ZP SRS region may be set in the SRS resource region as shown in the right side of FIG. 17.
  • the base station (or cell) may transmit information on a zero power SRS resource start position (for example, a start RE (resource element) and a symbol position), zero power SRS resource length information, and the like to the victim terminal.
  • a predetermined terminal as shown in Table 11 or Table 12 Even if the terminal is defined as the victim terminal, the base station can maintain the ZP SRS deactivation of the victim terminal.
  • a predetermined terminal as shown in Table 11 or Table 12 If it is defined as a victim terminal, the victim terminal does not map the relevant SRS sequence to the ZP SRS resource location informed by the base station.
  • 18 is a diagram illustrating a procedure for transmitting a zero power SRS.
  • adjacent cell transmits SRS configuration information (SRS period, SRS subframe index, etc.) to a serving cell.
  • the serving cell may transmit an indicator for triggering SRS transmission to the terminal (eg, UE X) through downlink control information (DCI).
  • the terminal eg, UE X
  • the terminal eg, UE X
  • the serving cell may measure the SINR in consideration of SRS configuration information of related neighbor cells and determine whether to define or declare a victim terminal to a terminal mapped to each related resource.
  • a predetermined terminal eg, UE X is the same as in Table 11 or Table 12 above.
  • information about the location of the ZP SRS region can be transmitted to a terminal (eg, UE X) in the serving cell. have. Thereafter, the terminal (eg, UE X) transmits the ZP SRS in the corresponding ZP SRS resource.
  • Embodiment 3 proposes that the serving cell allocates an unused Transmission Comb or sets a Zero Power SRS region for uplink interference measurement.
  • IM interference measurement
  • FIG. 19 is a diagram illustrating a Comb for IM (6 RB (12 RE per RB configuration example)) in SRS allocation.
  • the Transmission Comb (TC) index ⁇ 1, 2, 3 ⁇ is an SRS for terminals of the serving cell. If the (TC) index ⁇ 4 ⁇ is a resource for IM, a Transmission Comb (TC) index ⁇ 4 ⁇ may be allocated to the IM resource as shown in FIG. 19.
  • 20 is a diagram illustrating a zero power zone for IM when SRS is allocated.
  • a first RB (or RB having a lowest RB index) may be set as a Zero Power (ZP) SRS zone in an SRS zone of 6RB.
  • ZP Zero Power
  • 21 illustrates another ZP zone according to each uplink subframe for IM.
  • the configuration of uplink IM resources may be equal to or different from the transmission comb or ZP zone location according to a predetermined time unit (eg, subframe unit, symbol unit, or slot unit).
  • a predetermined time unit eg, subframe unit, symbol unit, or slot unit.
  • the transmission comb or ZP zone location may be informed to the UE through RRC signaling or DCI.
  • the ZP zone index can be simply expressed as follows according to the subframe index and the cell index ( ). In this case, the ZP region index is ⁇ 0,1,2 ⁇ .
  • 22 is a diagram illustrating the number of multiple ZP zones in an SRS band.
  • the number of ZP zones in the frequency axis may be n (where n is an integer).
  • two ZP zones may be configured on a subband (eg, 8 RB) for a specific service (eg, Ultra-Reliable Low Latency Communications (URLLC)).
  • a subband eg, 8 RB
  • a specific service eg, Ultra-Reliable Low Latency Communications (URLLC)
  • FIG. 23 is a diagram illustrating sequence configuration and physical resource mapping in consideration of a ZP zone.
  • the UE may generate an SRS sequence for an SRS length excluding ZP zone resources and allocate an SRS sequence to physical resource positions excluding the ZP zone. For example, as shown in FIG. 23, if the resource length for the entire SRS is M and the ZP zone length is s, the terminal generates a sequence of Ms length and allocates the generated sequence to the zone of Ms length. If Transmission Comb is set to k, then the sequence length Can be set to
  • the ZP length and position in the ZP zone may be configured in a UE-specific structure.
  • the serving base station may allocate a ZP resource for each port group (port group represents a subset of ports capable of simultaneous transmission) of each terminal in a cell.
  • the serving base station may inform the neighboring base stations (or cells) the resource region according to the simultaneous transmission port through the port group of the victim terminals through the X2 interface.
  • the neighboring base station uses DCI to SRS-triggered terminals among the terminals in the cell to which the neighboring base station belongs. Can be specified.
  • the number of Tx ports and the number of simultaneous transmission ports of the terminal may be determined according to the antenna capability of the terminals (for example, the number of antenna panels of the terminal, the number of antenna elements per panel, and the number of RF chains per panel). In this case, it may be desirable to configure a ZP zone in a terminal-specific structure and to set a ZP zone per Tx port of the terminal.
  • FIG. 24 is a diagram illustrating ZP SRS resource allocation for each port group in cell B for UE 1 of cell A.
  • FIG. 24 (a) shows an example of uplink transmission on a network including Cell A, Cell B, and Cell C.
  • FIG. 24B illustrates ZP zone partitioning for terminals (k terminals) transmitting SRS at a specific time in a network situation as shown in FIG. 24A.
  • the ZP resources divided into k in FIG. 24 may be separately allocated by the cell B for each port in the port group.
  • Such a ZP resource allocation of FIG. 24C corresponds to a configuration including interference coming from a simultaneous transmission port when measuring interference.
  • cell B may not allocate SRS for all k split ZP resources.
  • Fig. 24D an example of allocating ZP zones collectively in the same frequency band for all ports in a port group is shown.
  • 25 is a diagram illustrating variable allocation of a ZP zone according to UE capability.
  • the cell B when the cell B allocates SRS resources to the terminals in the cell, the cell B may have a ZP region having a different size according to the port group capability of each terminal. As shown in FIG. 25, since the victim terminal 2 of the serving cell has three ports in the port group unlike the victim terminal 1, the size / length of the ZP zone for the victim terminal 2 is the size of the ZP zone of the victim terminal 1d. It can be seen that it is larger or longer than the length.
  • the fourth embodiment is a symbol-wise or sub-symbol-wise uplink channel change (change according to beam or change according to channel itself), uplink channel on sub-band or whole band. It is proposed to set the minimum unit of resource for inter-cell interference measurement in the context of change (change by beam or change by channel itself). That is, a resource of a minimum unit representing interference measurement for uplink CSI is set in the New RAT system.
  • FIG. 26 is a diagram illustrating a minimum unit uplink resource (n X m) for inter-cell interference measurement.
  • a minimum unit for measuring uplink interference due to intercell interference may be set to n ⁇ m.
  • n may be a symbol unit, a sub-symbol unit, a slot unit, or a subframe unit.
  • m may be an RB, sub-RB, or RE unit.
  • the base station may measure the inter-cell interference through the average out of the SRS resources within a specified minimum unit of resources (or a designated minimum unit of measurement area).
  • the size of the set interference measurement resource may be represented in the form of various groups of the interference measurement minimum unit resources.
  • the base station may instruct SRS transmission to the terminal allocated to the resource location of the minimum unit of interference measurement for uplink interference measurement.
  • the base station may indicate by indicating the resource index of the interference measurement region or may be indicated by a bitmap (bitmap).
  • 27 is a diagram illustrating a method of indicating an interference measurement region.
  • the serving cell may indicate the interference measurement area to the terminal X.
  • the minimum resource size for interference measurement may be set to 1 symbol ⁇ 1 RB (for example, may be set to RRC signaling).
  • Table 13 below shows a bitmap and an index for RSRP / RSRQ / IM.
  • the serving cell may designate an RSRP measurement region, an RSRQ measurement region, and an IM measurement region as an index to inform the terminal X or indicate a bitmap.
  • the size of the set interference measurement resources may be represented in the form of various groups of the minimum unit resources for the interference measurement.
  • the base station may allocate the terminal to the corresponding resource for interference measurement, and may indicate the resource to the assigned terminal.
  • the terminal performs uplink transmission (eg, SRS transmission) on the indicated corresponding resource. If the SRS of the UE is not triggered, the base station measures RSRP / RSRQ with a DeModualtion Reference Signal (DMRS) in the group.
  • DMRS DeModualtion Reference Signal
  • FIG. 28 is a diagram exemplarily illustrating a procedure for transmission in a ZP SRS region in a New RAT system.
  • Victim terminals may be identified in a serving cell to define corresponding terminals as victim terminals.
  • the serving cell may also transmit the resource region used by the victim terminal and ZP SRS activation to the neighboring cell (s).
  • the serving cell includes, for example, information indicating that terminal b, terminal c, and terminal d are configured (or defined) as victim terminals, and information (eg, port group, ZP SRS region) of these victim terminals. ) May also be transmitted to adjacent cell (s).
  • the neighboring cell (s) can grasp the data area of the victim terminals of the serving cell based on the information transmitted by the serving cell, and within the cell of the neighboring cell in the uplink resource area corresponding to the data area of the victim terminals of the serving cell.
  • the UE When the UE is SRS triggered, it can be set to the ZP region. That is, if the SRS of the terminal X in the cell of the neighbor cell (s) is allocated to the uplink resource region corresponding to the data region of the victim terminals of the serving cell in the neighbor cell (s), the neighbor cell (s) is the terminal in the cell.
  • ZP SRS may be allocated to an uplink resource region corresponding to a data region of victim terminals of a serving cell. In this case, the serving cell may transmit a UL grant for data transmission to the victim terminal Y in the corresponding uplink resource region.
  • a terminal (aggressor UE X of FIG. 28) that receives information indicating that a ZP SRS is allocated to an uplink resource region corresponding to a data region of victim terminals of a serving cell from an adjacent cell may transmit an SRS including a ZP region. .
  • the victim terminal Y may transmit data in the corresponding uplink resource based on a UL grant.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • the method for controlling inter-cell interference in a wireless communication system and an apparatus therefor can be used in various industrial wireless communication systems such as 3GPP LTE / LTE-A system, 5G communication system.

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour une station de base pour contrôler l'interférence intercellulaire dans un système de communication sans fil pouvant comprendre : une étape consistant à décider d'au moins un terminal victime, parmi des terminaux à l'intérieur d'une cellule à laquelle appartient une station de base, selon un procédé prédéterminé; une étape consistant à transmettre, à une station de base voisine, des informations relatives à une zone de signal de référence de sondage (SRS) de puissance nulle pour le ou les terminaux victimes décidés; et une étape consistant à transmettre, au ou aux terminaux victimes décidés, des informations de contrôle pour une transmission de données de liaison montante dans une ressource correspondant à la zone SRS de puissance nulle.
PCT/KR2017/003047 2017-03-22 2017-03-22 Procédé de contrôle de l'interférence intercellulaire dans un système de communication sans fil et dispositif correspondant WO2018174309A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2017/003047 WO2018174309A1 (fr) 2017-03-22 2017-03-22 Procédé de contrôle de l'interférence intercellulaire dans un système de communication sans fil et dispositif correspondant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2017/003047 WO2018174309A1 (fr) 2017-03-22 2017-03-22 Procédé de contrôle de l'interférence intercellulaire dans un système de communication sans fil et dispositif correspondant

Publications (1)

Publication Number Publication Date
WO2018174309A1 true WO2018174309A1 (fr) 2018-09-27

Family

ID=63584424

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2017/003047 WO2018174309A1 (fr) 2017-03-22 2017-03-22 Procédé de contrôle de l'interférence intercellulaire dans un système de communication sans fil et dispositif correspondant

Country Status (1)

Country Link
WO (1) WO2018174309A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114467336A (zh) * 2019-10-03 2022-05-10 株式会社Ntt都科摩 终端和基站装置
WO2023219654A3 (fr) * 2021-10-27 2024-04-18 Arizona Board Of Regents On Behalf Of Arizona State University Apprentissage par renforcement de conception de motif de faisceau sensible aux interférences

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100122340A (ko) * 2009-05-12 2010-11-22 삼성전자주식회사 상향링크 공간분할 다중접속 기반 통신시스템에서 인접 섹터간 간섭을 억제하기 위한 장치 및 방법
KR20130077815A (ko) * 2010-05-03 2013-07-09 엘지전자 주식회사 협력 단말을 결정하는 방법 및 그 장치
US20140120940A1 (en) * 2011-06-30 2014-05-01 Zte Corporation Method and system of resource reconfiguration for cognitive-radio system
WO2014180601A1 (fr) * 2013-05-09 2014-11-13 Nokia Solutions And Networks Oy Utilisation efficace d'un symbole d'un signal de référence de sondage (srs) pour le sondage et les données
KR20160121165A (ko) * 2015-04-10 2016-10-19 삼성전자주식회사 간섭 제거 방법 및 그 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100122340A (ko) * 2009-05-12 2010-11-22 삼성전자주식회사 상향링크 공간분할 다중접속 기반 통신시스템에서 인접 섹터간 간섭을 억제하기 위한 장치 및 방법
KR20130077815A (ko) * 2010-05-03 2013-07-09 엘지전자 주식회사 협력 단말을 결정하는 방법 및 그 장치
US20140120940A1 (en) * 2011-06-30 2014-05-01 Zte Corporation Method and system of resource reconfiguration for cognitive-radio system
WO2014180601A1 (fr) * 2013-05-09 2014-11-13 Nokia Solutions And Networks Oy Utilisation efficace d'un symbole d'un signal de référence de sondage (srs) pour le sondage et les données
KR20160121165A (ko) * 2015-04-10 2016-10-19 삼성전자주식회사 간섭 제거 방법 및 그 장치

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114467336A (zh) * 2019-10-03 2022-05-10 株式会社Ntt都科摩 终端和基站装置
CN114467336B (zh) * 2019-10-03 2024-05-17 株式会社Ntt都科摩 终端和基站装置
WO2023219654A3 (fr) * 2021-10-27 2024-04-18 Arizona Board Of Regents On Behalf Of Arizona State University Apprentissage par renforcement de conception de motif de faisceau sensible aux interférences

Similar Documents

Publication Publication Date Title
WO2018199585A1 (fr) Procédé d'émission ou de réception de signaux dans un système de communication sans fil et appareil associé
WO2018174312A1 (fr) Procédé de commande d'interférences intercellulaires dans un système de communication sans fil et dispositif correspondant
WO2019022329A1 (fr) Procédé de transmission de srs et terminal associé
WO2018151554A1 (fr) Procédé de réception d'informations de configuration srs et terminal associé
WO2018164452A1 (fr) Procédé de réception ou de transmission de signal descendant dans un système de communication sans fil et appareil associé
WO2014073865A1 (fr) Procédé et appareil de transmission et de réception de données dans un système de communication sans fil
WO2013151395A1 (fr) Procédé de réception de données entrantes et dispositif sans fil utilisant ce procédé
WO2019143131A1 (fr) Procédé et dispositif d'émission d'un signal montant dans un système de communication sans fil
WO2016143968A1 (fr) Procédé pour réduire les ressources de transmission d'un canal de commande dans un tti court et dispositif l'utilisant
WO2019074338A1 (fr) Procédé et dispositif permettant d'effectuer une connexion initiale dans un système de communication sans fil
WO2016144028A1 (fr) Procédé de réception d'un signal de référence dans un système de communication sans fil, et dispositif associé
WO2014046499A1 (fr) Procédé et appareil pour transmettre et recevoir des informations d'état de canal (csi) dans un système de communication sans fil
WO2013062359A1 (fr) Procédé permettant de déterminer des informations de puissance de transmission d'une sous-trame de liaison descendante et appareil associé
WO2018084660A1 (fr) Procédé d'émission/réception de canal de commande de liaison montante physique entre un terminal et une station de base dans un système de communication sans fil et dispositif prenant en charge ledit procédé
WO2018226065A1 (fr) Procédé et appareil pour prendre en charge la double connectivité dans nr
WO2018159939A1 (fr) Procédé pour transmettre un srs dans un système de communication sans fil, et terminal associé
WO2016021999A1 (fr) Procédé de transmission de signa d2d dans une communication d2d, et dispositif correspondant
WO2013070035A1 (fr) Procédé pour surveiller un canal de contrôle et dispositif sans fil
WO2018012774A1 (fr) Procédé d'émission et de réception dans un système de communication sans fil, et appareil associé
WO2018207995A1 (fr) Procédé de réception d'informations de configuration srs dans un système de communication sans fil et terminal associé
WO2018030678A1 (fr) Signal de référence à structure variable
WO2012144801A2 (fr) Dispositif et procédé de transmission de signal dans un système de communication sans fil
WO2013176511A1 (fr) Procédé de transmission d'ack/nack de requête harq et dispositif sans fil utilisant ledit procédé
WO2013006006A2 (fr) Procédé et appareil de transmission d'un signal dans un système de communication sans fil
WO2018221882A1 (fr) Procédé de transmission et de réception d'un canal d'accès aléatoire dans un système de communication sans fil et dispositif associé

Legal Events

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

Ref document number: 17901719

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17901719

Country of ref document: EP

Kind code of ref document: A1