WO2012067403A2 - Procédé permettant à un terminal de transmettre une information d'interférence et à une station de base de contrôler l'interférence intercellulaire dans un système de télécommunication sans fil supportant une agrégation de porteuses, et appareil correspondant - Google Patents

Procédé permettant à un terminal de transmettre une information d'interférence et à une station de base de contrôler l'interférence intercellulaire dans un système de télécommunication sans fil supportant une agrégation de porteuses, et appareil correspondant Download PDF

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Publication number
WO2012067403A2
WO2012067403A2 PCT/KR2011/008698 KR2011008698W WO2012067403A2 WO 2012067403 A2 WO2012067403 A2 WO 2012067403A2 KR 2011008698 W KR2011008698 W KR 2011008698W WO 2012067403 A2 WO2012067403 A2 WO 2012067403A2
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WIPO (PCT)
Prior art keywords
base station
interference
terminal
cell
information
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PCT/KR2011/008698
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English (en)
Korean (ko)
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WO2012067403A3 (fr
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김진민
류탁기
문성호
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엘지전자 주식회사
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Publication of WO2012067403A2 publication Critical patent/WO2012067403A2/fr
Publication of WO2012067403A3 publication Critical patent/WO2012067403A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission during data packet transmission, e.g. high speed packet access [HSPA]

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method for transmitting interference information by a terminal in a wireless communication system supporting carrier aggregation (CA), a method for controlling inter-cell interference by a base station, and an apparatus therefor. It is about.
  • CA carrier aggregation
  • Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • An object of the present invention is to provide a method for a terminal to transmit interference information in a wireless communication system supporting carrier aggregation.
  • Another object of the present invention is to provide a method for controlling interference between cells by a base station in a wireless communication system supporting carrier aggregation.
  • Another object of the present invention is to provide a terminal apparatus for transmitting interference information in a wireless communication system supporting carrier aggregation.
  • Another object of the present invention is to provide a base station apparatus for controlling inter-cell interference in a wireless communication system supporting carrier aggregation.
  • the method may further include transmitting the generated interference amount information to the serving base station.
  • the interference amount information may be an average value or a normalized value of the noise and interference from the at least one neighboring base station.
  • a method for controlling inter-cell interference by a base station in a wireless communication system supporting Carrier Aggregation (CA) includes information on the amount of interference from at least one terminal. Receiving; And generating inter-cell interference control information based on the received interference amount information, wherein the interference amount information comes from at least one neighboring base station except for the base station signal and noise other than the base station signal.
  • the amount of downlink interference may be information generated for each component carrier (CC) configured in each of the at least one terminal.
  • the step of generating the inter-cell interference control message may generate the inter-cell interference control message based on resource share for each CC configured in the at least one terminal in addition to the interference amount information.
  • the method may further include transmitting the generated intercell interference control information to at least one neighboring base station.
  • the method also includes receiving inter-cell interference control information generated from at least one neighboring base station, respectively; And controlling downlink transmission power based on the generated intercell interference control information and the received intercell interference control information of the at least one neighboring base station.
  • the generated inter-cell interference control information may include interference amount information of terminals located near each adjacent cell in each cell.
  • a method for controlling inter-cell interference by a base station in a wireless communication system supporting carrier aggregation (CA) includes information on interference amount from at least one terminal. Receiving; And generating inter-cell interference control information based on the received interference amount information and resource occupancy for each component carrier (CC) configured in each of the at least one terminal, wherein the interference amount information is the at least one terminal.
  • the amount of downlink interference received from the at least one neighboring base station using the downlink reference signal from the at least one neighboring base station may be information measured for each component carrier (CC) configured in the terminal.
  • the method may further include transmitting the generated inter-cell interference control information to the at least one neighbor base station.
  • a terminal apparatus for transmitting interference information in a wireless communication system supporting carrier aggregation (CA) includes a receiver for receiving a downlink reference signal from a serving base station; By using the received downlink reference signal of the serving base station, the noise other than the serving base station signal and the amount of downlink interference from at least one neighboring base station except the serving base station is measured for each component carrier (CC) configured in the terminal And a processor for generating interference amount information based on the measured result, wherein the interference amount information may be generated for each component carrier.
  • CC component carrier
  • a base station apparatus for generating inter-cell interference control information in a wireless communication system supporting carrier aggregation (CA) may receive interference amount information from at least one terminal. receiving set; And a processor configured to generate inter-cell interference control information based on the received interference amount information and resource occupancy for each component carrier (CC) configured in each of the at least one terminal, wherein the interference amount information is the at least one terminal.
  • the amount of downlink interference received from the at least one neighboring base station using the downlink reference signal from the at least one neighboring base station may be information measured for each component carrier (CC) configured in the terminal.
  • power control for each component carrier may be efficiently performed using resource occupancy or cell capacity of a cell edge terminal in order to consider actual interference in a carrier aggregation based heterogeneous network environment. Optimization of cell capacity can be achieved.
  • FIG. 1 is a block diagram illustrating the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • FIG. 2 is a diagram for explaining physical channels used in a 3GPP LTE / LTE-A system and a general signal transmission method using the same in a wireless communication system.
  • FIG 3 illustrates a structure of a radio frame used in a 3GPP LTE / LTE-A system which is one of the wireless communication systems.
  • FIG. 4 is a diagram illustrating a resource grid of a downlink slot of a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • FIG. 5 illustrates a structure of a downlink subframe of a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • FIG. 6 illustrates a structure of an uplink subframe used in a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • FIG. 7 illustrates a carrier aggregation (CA) communication system in a 3GPP LTE / LTE-A system, which is an example of a wireless communication system.
  • CA carrier aggregation
  • FIG. 8 illustrates a heterogeneous network including a macro cell and a micro cell.
  • FIG. 9 illustrates a situation in which inter-cell interference occurs in a heterogeneous network in more detail.
  • FIG. 10 is a diagram illustrating a method of eliminating inter-cell interference in a heterogeneous network.
  • FIG. 11 is a diagram illustrating an example of cell deployment in a heterogeneous network.
  • FIG. 12 is a diagram illustrating an example of a process for controlling inter-cell interference according to the present invention.
  • FIG. 13 is a diagram illustrating a resource occupancy rate of a cell boundary terminal.
  • 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 user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
  • 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 information transmitted or received by the terminal.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) employs OFDMA in downlink and SC-FDMA in uplink as part of Evolved UMTS (E-UMTS) using E-UTRA.
  • LTE-A Advanced is an evolution of 3GPP LTE.
  • FIG. 1 is a block diagram illustrating 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 175, 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 280 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, 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.
  • FIG. 2 is a diagram for explaining physical channels used in a 3GPP LTE / LTE-A system and a general signal transmission method using the same in a wireless communication system.
  • an initial cell search operation such as synchronization with a base station is performed in step S201.
  • the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID.
  • the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE receives a physical downlink control channel (PDSCH) according to physical downlink control channel (PDCCH) and physical downlink control channel information in step S202 to provide more specific information.
  • PDSCH physical downlink control channel
  • PDCCH physical downlink control channel
  • System information can be obtained.
  • the terminal may perform a random access procedure as described in steps S203 to S206 to complete the access to the base station.
  • the UE transmits a preamble through a physical random access channel (PRACH) (S203), a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. It may be received (S204).
  • PRACH physical random access channel
  • contention resolution procedures such as transmission of an additional physical random access channel (S205) and a physical downlink control channel and a corresponding physical downlink shared channel reception (S206) may be performed. .
  • the UE After performing the above-described procedure, the UE performs a physical downlink control channel / physical downlink shared channel reception (S207) and a physical uplink shared channel (PUSCH) / as a general uplink / downlink signal transmission procedure.
  • Physical Uplink Control Channel (PUCCH) transmission (S208) may be performed.
  • the control information transmitted from the terminal to the base station is collectively referred to as uplink control information (UCI).
  • UCI includes Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK (HARQ ACK / NACK), Scheduling Request (SR), Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indication (RI), and the like.
  • HARQ ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK
  • SR Scheduling Request
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • HARQ ACK / NACK is simply referred to as HARQ-ACK or ACK / NACK (A / N).
  • HARQ-ACK includes at least one of positive ACK (simply ACK), negative ACK (NACK), DTX, and NACK / DTX.
  • UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data should be transmitted at the same time. In addition, the UCI may be aperiodically transmitted through the PUSCH by the request / instruction of the network.
  • FIG 3 illustrates a structure of a radio frame used in a 3GPP LTE / LTE-A system which is one of the wireless communication systems.
  • uplink / downlink data packet transmission is performed in subframe units, and one subframe is defined as a predetermined time interval including a plurality of OFDM symbols.
  • the 3GPP LTE standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
  • the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • One slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • RBs resource blocks
  • a resource block (RB) as a resource allocation unit may include a plurality of consecutive subcarriers in one slot.
  • the number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
  • CPs include extended CPs and normal CPs.
  • the number of OFDM symbols included in one slot may be seven.
  • the OFDM symbol is configured by the extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the standard CP.
  • the number of OFDM symbols included in one slot may be six. If the channel state is unstable, such as when the terminal moves at a high speed, an extended CP may be used to further reduce intersymbol interference.
  • one subframe includes 14 OFDM symbols.
  • the first up to three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • Type 2 radio frames consist of two half frames, each of which has five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS uplink pilot time slot
  • One subframe consists of two slots.
  • DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.
  • FIG. 4 is a diagram illustrating a resource grid of a downlink slot of a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • the downlink slot includes a plurality of OFDM symbols in the time domain.
  • One downlink slot may include 7 (6) OFDM symbols, and the resource block may include 12 subcarriers in the frequency domain.
  • Each element on the resource grid is referred to as a resource element (RE).
  • One RB contains 12x7 (6) REs.
  • the number of RBs included in the downlink slot NRB depends on the downlink transmission band.
  • the structure of an uplink slot is the same as that of a downlink slot, but an OFDM symbol is replaced with an SC-FDMA symbol.
  • FIG. 5 illustrates a structure of a downlink subframe of a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • up to three (4) OFDM symbols located at the front of the first slot of a subframe correspond to a control region to which a control channel is allocated.
  • the remaining OFDM symbols correspond to data regions to which the Physical Downlink Shared CHance (PDSCH) is allocated.
  • Examples of a downlink control channel used in 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 is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used for transmission of a control channel within the subframe.
  • the PHICH carries a HARQ ACK / NACK (Hybrid Automatic Repeat request acknowledgment / negative-acknowledgment) signal in response to uplink transmission.
  • DCI downlink control information
  • the DCI format is defined as format 0 for uplink, formats 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, and so on for downlink.
  • the DCI format includes a hopping flag, RB assignment, modulation coding scheme (MCS), redundancy version (RV), new data indicator (NDI), transmit power control (TPC), and cyclic shift DM RS, depending on the application.
  • MCS modulation coding scheme
  • RV redundancy version
  • NDI new data indicator
  • TPC transmit power control
  • Information including a reference signal (CQI), a channel quality information (CQI) request, a HARQ process number, a transmitted precoding matrix indicator (TPMI), and a precoding matrix indicator (PMI) confirmation are optionally included.
  • CQI reference signal
  • CQI channel quality information
  • TPMI transmitted precoding matrix indicator
  • PMI pre
  • the PDCCH includes a transmission format and resource allocation information of a downlink shared channel (DL-SCH), a transmission format and resource allocation information of an uplink shared channel (UL-SCH), a paging channel, Resource allocation information of upper-layer control messages such as paging information on PCH), system information on DL-SCH, random access response transmitted on PDSCH, Tx power control command set for individual terminals in terminal group, Tx power control command , The activation instruction information of the Voice over IP (VoIP).
  • a plurality of PDCCHs may be transmitted in the control region.
  • the terminal may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • the CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • the format of the PDCCH and the number of PDCCH bits are determined according to the number of CCEs.
  • the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
  • the CRC is masked with an identifier (eg, a radio network temporary identifier (RNTI)) according to the owner or purpose of use of the PDCCH.
  • RNTI radio network temporary identifier
  • an identifier eg, cell-RNTI (C-RNTI)
  • C-RNTI cell-RNTI
  • P-RNTI paging-RNTI
  • SI-RNTI system information RNTI
  • RA-RNTI random access-RNTI
  • FIG. 6 illustrates a structure of an uplink subframe used in a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • an uplink subframe includes a plurality of slots (eg, two).
  • the slot may include different numbers of SC-FDMA symbols according to the CP length.
  • the uplink subframe is divided into a data region and a control region in the frequency domain.
  • the data area includes a PUSCH and is used to transmit a data signal such as voice.
  • the control region includes a PUCCH and is used to transmit uplink control information (UCI).
  • UCI uplink control information
  • the PUCCH includes RB pairs located at both ends of the data region on the frequency axis and hops to a slot boundary.
  • PUCCH may be used to transmit the following control information.
  • SR Service Request: Information used for requesting an uplink UL-SCH resource. It is transmitted using OOK (On-Off Keying) method.
  • HARQ ACK / NACK This is a response signal for a downlink data packet on a PDSCH. Indicates whether the downlink data packet was successfully received.
  • One bit of ACK / NACK is transmitted in response to a single downlink codeword (CodeWord, CW), and two bits of ACK / NACK are transmitted in response to two downlink codewords.
  • CQI Channel Quality Indicator
  • MIMO Multiple input multiple output
  • RI rank indicator
  • PMI precoding matrix indicator
  • PTI precoding type indicator
  • the amount of control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for control information transmission.
  • SC-FDMA available for transmission of control information means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of the subframe in which the Sounding Reference Signal (SRS) is set, the last of the subframe SC-FDMA symbols are also excluded.
  • the reference signal is used for coherent detection of the PUCCH.
  • PUCCH supports seven formats according to the transmitted information.
  • Table 1 shows a mapping relationship between PUCCH format and UCI in LTE.
  • Uplink Control Information Format 1 Scheduling Request (SR) (Unmodulated Waveform) Format 1a 1-bit HARQ ACK / NACK (with or without SR) Format 1b 2-bit HARQ ACK / NACK (with or without SR) Format 2 CQI (20 coded bits) Format 2 CQI and 1- or 2-bit HARQ ACK / NACK (20 bit) (Extended CP only) Format 2a CQI and 1-Bit HARQ ACK / NACK (20 + 1 Coded Bits) Format 2b CQI and 2-bit HARQ ACK / NACK (20 + 2 coded bits)
  • SR Scheduling Request
  • FIG. 7 illustrates a carrier aggregation (CA) communication system in a 3GPP LTE / LTE-A system, which is an example of a wireless communication system.
  • CA carrier aggregation
  • the LTE-A system uses a carrier aggregation or bandwidth aggregation technique that combines a plurality of uplink / downlink frequency bandwidths for a wider frequency bandwidth and uses a larger uplink / downlink bandwidth.
  • Each small frequency bandwidth is transmitted using a component carrier (CC).
  • the component carrier may be understood as the carrier frequency (or center carrier, center frequency) for the corresponding frequency block.
  • Each of the CCs may be adjacent or non-adjacent to each other in the frequency domain.
  • the bandwidth of the CC may be limited to the bandwidth of the existing system for backward compatibility with the existing system.
  • the existing 3GPP LTE system supports ⁇ 1.4, 3, 5, 10, 15, 20 ⁇ MHz bandwidth
  • LTE_A can support a bandwidth greater than 20MHz using only the bandwidths supported by LTE.
  • the bandwidth of each CC can be determined independently. It is also possible to merge asymmetric carriers in which the number of UL CCs and the number of DL CCs differ.
  • the DL CC / UL CC link may be fixed in the system or configured semi-statically. For example, as shown in FIG.
  • the frequency band that a specific UE can monitor / receive may be limited to M ( ⁇ N) CCs.
  • Various parameters for carrier aggregation may be set in a cell-specific, UE group-specific or UE-specific manner.
  • the control information may be set to be transmitted and received only through a specific CC.
  • a specific CC may be referred to as a primary CC (PCC) and the remaining CC may be referred to as a secondary CC (SCC).
  • PCC primary CC
  • SCC secondary CC
  • LTE-A uses the concept of a cell to manage radio resources.
  • a cell is defined as a combination of downlink resources and uplink resources, and uplink resources are not required. Accordingly, the cell may be configured with only downlink resources or with downlink resources and uplink resources. If carrier aggregation is supported, the linkage between the carrier frequency (or DL CC) of the downlink resource and the carrier frequency (or UL CC) of the uplink resource may be indicated by system information.
  • a cell operating on the primary frequency (or PCC) may be referred to as a primary cell (PCell), and a cell operating on the secondary frequency (or SCC) may be referred to as a secondary cell (SCell).
  • PCell primary cell
  • SCell secondary cell
  • the PCell is used by the terminal to perform an initial connection establishment process or to perform a connection re-establishment process.
  • PCell may refer to a cell indicated in the handover process.
  • the SCell is configurable after a Radio Resource Control (RRC) connection is established and can be used to provide additional radio resources.
  • RRC Radio Resource Control
  • PCell and SCell may be collectively referred to as a serving cell. Therefore, in the case of the UE that is in the RRC_CONNECTED state, but carrier aggregation is not configured or does not support carrier aggregation, there is only one serving cell configured only with the PCell.
  • the network may configure one or more SCells for the UE supporting carrier aggregation in addition to the PCell initially configured in the connection establishment process.
  • FIG. 8 illustrates a heterogeneous network including a macro cell and a micro cell.
  • next-generation communication standards including 3GPP LTE-A, heterogeneous networks in which microcells with low power transmission power overlap within existing macro cell coverage are discussed.
  • a macro cell may overlap one or more micro cells.
  • the service of the macro cell is provided by the macro base station (Macro eNodeB, MeNB).
  • the macro cell and the macro base station may be used interchangeably.
  • the terminal connected to the macro cell may be referred to as a macro UE.
  • the macro terminal receives a downlink signal from the macro base station and transmits an uplink signal to the macro base station.
  • Micro cells are also referred to as femto cells, pico cells.
  • the service of the micro cell is provided by a pico base station (Pico eNodeB), a home base station (Home eNodeB, HeNB), a relay node (Relay Node, RN) and the like.
  • a pico base station (Pico eNodeB), a home base station (Home eNodeB, HeNB), and a relay node (Relay Node, RN) are collectively referred to as a home base station (HeNB).
  • the micro cell and the home base station may be used interchangeably.
  • the terminal connected to the micro cell may be referred to as a micro terminal or a home terminal.
  • the home terminal receives a downlink signal from the home base station and transmits an uplink signal to the home base station.
  • Micro cells may be divided into OA (open access) cells and CSG (closed subscriber group) cells according to accessibility.
  • the OA cell refers to a micro cell that can receive a service at any time when the terminal is required without additional access restriction.
  • the CSG cell refers to a micro cell in which only a specific authorized terminal can receive a service.
  • inter-cell interference becomes a problem because macro and micro cells overlap.
  • the downlink signal of the home base station acts as an interference to the macro terminal.
  • the downlink signal of the macro base station may act as interference to the home terminal in the micro cell.
  • the uplink signal of the macro terminal may act as an interference to the home base station.
  • the uplink signal of the home terminal may act as an interference to the macro base station.
  • FIG. 9 illustrates a situation in which inter-cell interference occurs in a heterogeneous network in more detail.
  • dotted lines represent communication links and dotted lines represent interference.
  • the macro terminal not connected to the CSG cell may be interfered by the home base station,
  • the macro terminal may cause interference with the home base station, and
  • the CSG terminal is accessed by another CSG home base station. May interfere.
  • the illustrated interference situation is an example, and various interference situations may occur according to a network and a terminal configuration.
  • the macro cell may cause strong interference to the terminal of the pico cell, particularly the pico cell at the boundary of the pico cell. Accordingly, a method of resolving uplink and downlink interference on data and L1 / L2 control signals, synchronization signals, and reference signals is required.
  • Inter-Cell Interference Cancellation (ICIC) schemes can be addressed in the time, frequency and / or spatial domains.
  • FIG. 10 is a diagram illustrating a method of eliminating inter-cell interference in a heterogeneous network.
  • a macro cell causing intercell interference may configure an ABS (or ABSF) (Almost Blank Subframe) in a radio frame.
  • ABS represents a subframe (Subframe, SubF) is set so that the normal DL signal is not transmitted except for a specific DL signal.
  • Specific DL signals include, but are not limited to, for example, a cell-specific reference signal (CRS) or a cell-common reference signal (CRS).
  • CRS cell-specific reference signal
  • CRS cell-common reference signal
  • the ABS may be repeated to have a constant pattern within one or more radio frames. The figure illustrates a case where ABS is set in subframe # 2 / # 6.
  • the macro cell informs the pico cell of the ABS configuration through the backhaul, and the pico cell may schedule the pico terminal using the ABS configuration.
  • the pico terminal may be scheduled only during the ABS period.
  • channel state information (CSI) measurement of the pico terminal may be performed only in the ABS.
  • Radio Link Management RLM
  • RRM Radio Resource Management
  • RRM Radio Resource Management
  • RSRP Reference Signal Received Power
  • 3GPP RAN Radio Access Network 2 requires defining new signaling indicating which subframe should be measured. For example, bitmap signaling having the same period as backhaul signaling (eg, 1 means “terminal can measure” in the corresponding subframe, and 0 means “terminal should not measure” in the corresponding subframe). Can be applied).
  • the restriction pattern can be constructed independently from the backhaul bit-pattern.
  • the present invention proposes a method for performing interference control in a carrier merging (CA) -based HetNet system.
  • the processor 155 of the terminal measures the actual amount of interference for each CC received from the actual neighboring cell or the amount of cell capacity reduction caused by the cell, and encodes the encoded information into a message. In exchange with each other, it can be used for inter-cell interference control by sharing the power control information for each CC. Inter-cell interference control can be classified into reactive IC (interference coordination) based on the amount of interference or cell capacity reduction.
  • RIIC Reactive Interference Indicator per Carrier
  • the processor 180 of the base station may configure and generate an RIIC message in consideration of the amount of resources occupied by the cell boundary terminals as well as the amount of interference received by the cell boundary terminals reported from the cell boundary terminals.
  • the cell capacity reduction amount may be analyzed and generated as a RIIC message.
  • transmission power information is exchanged between base stations in advance, and the cell receiving the information is a method of scheduling a resource transmitted by a neighboring cell with small power so that the cell boundary terminal receives little interference.
  • This technique has the advantage of predicting the amount of interference using the power to be transmitted by the neighboring cell and scheduling cell boundary terminals in advance, but the terminal at the cell boundary is actually subjected to some interference and scheduling to other resources to avoid the interference. Since it is impossible to determine how the cell capacity is affected at the time, there is a disadvantage in that it is difficult to optimize according to the operating environment in terms of cell capacity. Therefore, there is a need for a technique for adaptively performing interference control based on the amount of interference actually experienced by cell boundary terminals or the amount of cell capacity reduction caused by the current network environment, and a method for this will be described below.
  • the processor 155 of the terminal encodes the measurement information into a message in consideration of the amount of interference experienced by the actual downlink and the amount of reduced cell capacity.
  • the processor 155 of the terminal encodes the measurement information into a message in consideration of the amount of interference experienced by the actual downlink and the amount of reduced cell capacity.
  • FIG. 11 is a diagram illustrating an example of cell deployment in a heterogeneous network.
  • FIG. 11 illustrates an example of a configuration of a heterogeneous network environment in which a macro cell and a pico cell are mixed, and a reactive interference information exchange process proposed by the present invention may be performed between macro cells as well as between macro cells. It may also be performed between pico cells, and may be applied to heterogeneous network environments other than these.
  • Each base station determines the power level for each CC (Component Carrier) for a certain period of time based on the information received after performing the information exchange process, and at the same time, the information exchanged is also continuously updated to control power for each CC for the next predetermined time interval. Can be performed.
  • CC Component Carrier
  • FIG. 12 is a diagram illustrating an example of a process for controlling inter-cell interference according to the present invention.
  • a terminal having a large influence of interference may be a terminal located at a cell boundary. Therefore, in order for the processor 180 of the serving base station to construct a RIIC message, it is necessary to first classify a terminal located at a cell boundary.
  • the processor 180 of the serving base station may classify the cell boundary terminal based on the neighbor cell signal measurement value reported by the terminal. That is, when the terminal measures the reception power of the neighbor cell signal and reports it to the serving base station, the processor 180 of the serving base station classifies the terminal that the neighbor cell signal is received with the received measurement value more than a predetermined threshold as the cell boundary terminal. can do.
  • each UE may periodically or adjacently report the neighbor cell ID (IDentifier, ID) information corresponding to the measurement as well as the measurement of the neighbor cell signal, the processor 180 of the serving base station through this Information on which base station the cell edge terminal is near may be known. Therefore, the serving base station can determine the cell boundary terminal information near each neighboring cell.
  • the terminal may basically report long-term measurement information to the serving base station, and if necessary, the short-term measurement information may be additionally reported to the serving base station, and the serving base station may report from the terminal.
  • the cell boundary terminals can be distinguished through the reported neighbor cell signal measurements.
  • the terminal may measure the amount of interference experienced by one of the first measurement method and the second measurement method.
  • the serving base station may separately signal to report the information measured by the first measurement scheme to the specific terminal (S1210).
  • the serving base station and the terminal is configured to measure and report in advance in the first measurement report method, the serving base station may not perform a separate signaling for measuring and reporting to the terminal in the first measurement method.
  • a cell boundary terminal can measure an interference signal (that is, noise and other cell interference) using a reference signal of a serving cell (S1220).
  • the processor 155 of the cell boundary terminal measures all noise other than the serving cell signal and the actual interference amount of all other cells using the reference signal of the serving cell, and reports the result to the serving base station by the cell boundary terminal.
  • the amount of interference can be measured effectively. However, it is not possible to measure the exact amount of interference of cell-specific neighboring cells.
  • the processor 155 of the terminal receives the interference information measured in this manner. Generate (or configure) in the form of information (S1230), the terminal may report this to the serving base station (S1240).
  • the cell boundary terminal located close to the jth neighboring cell in the ith cell is referred to as all neighbor cell interference and noise measurements for the kth component carrier (CC, for example, various values such as average or normalized dimension).
  • CC kth component carrier
  • the processor 155 of the cell boundary terminal may measure the neighbor cell signal using the reference signal of the neighbor cell (S1220). As described above, the cell boundary terminal reports the neighbor cell signal measurement value to the serving base station and may correspond to path loss information of the neighbor cell.
  • the processor 155 of the terminal receives the dosing information between adjacent cells measured by the second measurement method. It may be generated or configured in the form of information (S1230), the terminal may report this to the serving base station (S1240).
  • the cell boundary terminal located close to the j-th neighboring cell in the i-th cell is a measurement of the j-th neighboring cell signal for the k-th component carrier (CC, for example, various values such as average value or normalized dimension). Can be defined In this case, it is possible to reuse the RSRP measurement and reporting structure in the 3GPP LTE system.
  • CC k-th component carrier
  • RSRP reference signal received power
  • the terminal may measure the channel quality state between the terminal itself and the cell using RSRP corresponding to the power of the pilot signal.
  • RSRP refers to a linear average of power distributed to resource elements to which a cell-specific reference signal is allocated within the considered measurement frequency bandwidth.
  • the power of each resource element on the resource block may be determined from the energy received from the valid period of the symbol except for the cyclic prefix (CP).
  • the reference signal reception power may be applied to the terminal in both the RRC_idle state and the RRC_connected state.
  • the reported value will be equal to the linear average of the power values of all diversity branches.
  • the processor 155 of the terminal may measure the reference signal reception power of the cell by accumulating the pilot signal transmitted by each cell for a specified time and a corresponding bandwidth.
  • the processor 155 of the UE may measure RSRP for each cell to which the UE belongs and the neighbor cell according to information given by the base station.
  • the UE may report an RSRP value, which is a received signal size of a reference signal of a neighbor cell, to the serving base station in an event-triggering report method.
  • the serving base station since the terminal measures the signal size of the neighboring cell periodically or aperiodically and reports it to the base station, the serving base station separately signals the terminal to report the information measured by the second measurement method. There is no need to give.
  • the RIIC message may be configured based on the operation S1250.
  • the RIIC message configuration generated by the serving base station may be represented by Equation 1 below. Equation 1 below is a RIIC message configuration generated by the i-th base station.
  • N represents the component carrier index of the i-th cell, and in Equation 1, the number of component carriers of the i-th cell is N.
  • Is RIIC information of the k-th component carrier of the i-th cell and may be scalar value or binary information. The information is information on the amount of interference currently received by the k-th component carrier or the amount of capacity reduction caused by the k-th component carrier.
  • the processor 180 of the base station generates the information based on the measurement information reported from the terminal.
  • the RIIC message generation method is classified into two methods as follows.
  • the processor 180 of the serving base station may be generated based on the measurement report information of the terminal.
  • the method measures the neighbor cell signal measured and reported by the terminal. or It is generated using only a value and is generated without scheduling information of a cell boundary terminal. According to the two measured values, it can be expressed as follows.
  • F [] represents a mapping function for generating a message.
  • the j-th neighbor cell signal measurement value (for example, various values such as an average value or a normalized dimension) for the k-th CC of the boundary terminals located near the j th neighbor cell in the i th cell is shown. .
  • f [] represents a mapping function for generating messages.
  • the processor 180 of the serving base station may generate and configure an RIIC message based on the resource occupancy of the cell boundary terminal together with the measurement information of the terminal.
  • the method measures the neighbor cell signal measured and reported by the terminal. or In addition to the value, the message is generated in consideration of the scheduling information of the cell boundary terminal.
  • the information is generated only by measuring the interference amount experienced by the cell edge terminal as in the first RIIC message generation method, since information on whether the actual cell edge terminal is scheduled is not reflected, the effect of the actual interference on the downlink data channel is not reflected. It cannot be reflected. That is, by considering and reflecting not only the amount of interference experienced by the cell edge terminal but also information on how much the cell edge terminals are actually scheduled, inter-cell interference control can be more accurately performed.
  • FIG. 13 is a diagram illustrating a resource occupancy rate of a cell boundary terminal.
  • FIG. 13 resources or cell capacity occupied by cell boundary terminals for a predetermined time are illustrated. If the cell boundary terminals occupy only a portion of the resource occupancy or cell capacity, such as pattern 2 (pattern # 2) shown in FIG. However, in the case of pattern 3 (pattern # 3), since it occupies a large portion of the resource occupancy or cell capacity of the serving cell, even if the influence of interference is small, performance degradation due to interference is large. Therefore, it is necessary to consider the actual resource occupancy of the cell edge terminals as well as the interference amount to reflect the effect of the actual interference, and it is necessary to perform the interference-based power control by exchanging such information between base stations.
  • This second RIIC message generation method can also be expressed as follows according to the two measurement information as in the first RIIC message generation method.
  • the second RIIC message generation method includes information measured and reported by the first measurement method ( ) And the resource occupancy of the cell boundary terminal (scheduled resource amount (for example, the number of scheduled RBs) and information measured and reported by the second measurement method ( ) And the resource occupancy (scheduling) of the cell boundary terminal.
  • the resource occupancy of the cell boundary terminal scheduled resource amount (for example, the number of scheduled RBs)
  • the resource occupancy (scheduling) of the cell boundary terminal In the former case, it may be expressed as in Equation 4 below, and in the latter case, it may be represented as in Equation 6.
  • I a vector having all neighbor cell interference and noise measurements for the k th CCs of boundary terminals located close to the j th neighboring cell in the i th cell (the vector size, that is, the number of elements is the j th neighbor). Number of edge terminals located close to the cell).
  • I a vector having a normalized resource occupancy (value between 0 and 1) in the k th CC for a certain time interval of boundary terminals located near the j th neighbor cell in the i th cell (vector size The number of elements is the number of boundary terminals located close to the j th neighbor cell).
  • f [] represents a mapping function for message generation.
  • the mapping function may be implemented using a mapping function as shown in Equation 5 based on a bitmap message type.
  • A is the number of neighboring base stations
  • B (p) is the number of cell boundary terminals interfered by the neighboring base station p
  • Threshold is a threshold value used for message generation.
  • A is the number of neighboring base stations
  • B (p) is the number of cell boundary terminals interfered by the neighboring base station p
  • Threshold is a threshold value used for message generation.
  • a message type represented by a bitmap is illustrated.
  • Equation 6 Is a vector having the j th neighbor cell signal measurement for the k th CC of the boundary terminals located near the j th neighboring cell in the i th cell (the vector size, that is, the number of elements is the j th neighbor). Number of edge terminals located close to the cell). Is the same as defined in Equation 4.
  • f [] represents a mapping function for generating messages.
  • the method associated with Equation 6 may also be configured in an embodiment similar to the method illustrated in Equations 4 and 5 above.
  • RIIC message information may be shared between the serving base station and the neighbor base station for the specific terminal through exchange with each other (S1260).
  • the neighboring cell can also generate a RIIC message common to the neighboring cells (common) in consideration of the measurement value and resource occupancy for all cell boundary terminals, and can also operate based on this.
  • the RIIC message has a metric that quantifies the received interference amount or the cell capacity reduction amount as an element.
  • the metric is generated in the manner described above, and the represented type can be configured in various forms.
  • the amount of interference or cell capacity reduction may be represented by two values of high / low in a bitmap manner.
  • An example of the RIIC message type represented by such a bitmap method is illustrated in Table 2 below.
  • the RIIC message generated by each base station is used to perform interference control, that is, power control for each CC, through an information exchange process between base stations.
  • the signaling method for exchanging information between base stations is possible in two ways as follows.
  • a wired interface between base stations This is a technique for transmitting and receiving RIIC messages generated by using a base station wired interface.
  • an X2 interface which is a direct interface between base stations of a 3GPP LTE / LTE-A system, may be used.
  • a radio interface between base stations can be used.
  • each base station may perform power control for cell boundary terminals.
  • the processor 180 of each base station may perform power control for each component carrier (CC) for cell boundary terminals.
  • the processor 180 of each base station may perform power control for each CC according to the received RIIC message, and may perform soft type power control.
  • the soft type power control means that the power level is flexibly adjusted for each component carrier (CC) rather than a hard type controlled on / off. That is, the neighboring base stations by the RIIC message to reduce the transmission power for the CC having a lot of interference to mitigate the interference, and to increase the cell capacity by increasing the transmission power for the CC that does not have a significant correlation. In a network environment operating in this way, the entire network can be effectively operated while maintaining an interference level below a certain level adaptively.
  • a method of transmitting interference information by a terminal and a method of controlling interference between cells by a base station are industrially used in various communication systems such as 3GPP LTE, LTE-A, and IEEE 802. Available.

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Abstract

L'invention concerne un procédé permettant à un terminal de transmettre une information d'interférence et à une base station de contrôler l'interférence intercellulaire dans un système de télécommunications sans fil supportant une agrégation de porteuses (CA). Le procédé permettant au terminal de transmettre une information d'interférence dans le système de télécommunications sans fil supportant une agrégation de porteuses comprend les étapes suivantes : réception d'un signal de référence espace-terre provenant d'une station de base de desserte; mesure du bruit ne constituant pas un signal provenant de la station de base de desserte, et de la quantité d'interférence satellite-terre émanant d'au moins une station de base de proximité immédiate, à l'exception de la base de desserte, pour chaque porteuse composante (CC) comportant le terminal utilisant le signal de référence espace-terre qui est reçu par la station de base de desserte; et, sur la base du résultat de la mesure, génération de l'information d'interférence, l'information d'interférence pouvant être générée pour chaque CC.
PCT/KR2011/008698 2010-11-16 2011-11-15 Procédé permettant à un terminal de transmettre une information d'interférence et à une station de base de contrôler l'interférence intercellulaire dans un système de télécommunication sans fil supportant une agrégation de porteuses, et appareil correspondant WO2012067403A2 (fr)

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US9681437B2 (en) 2012-06-27 2017-06-13 Sony Corporation Methods and apparatus for communicating resource information in a communication system
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