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WO2017200119A1 - Procédé d'application de technique d'atténuation d'interférence de canal de commande par un terminal, et dispositif associé - Google Patents

Procédé d'application de technique d'atténuation d'interférence de canal de commande par un terminal, et dispositif associé Download PDF

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Publication number
WO2017200119A1
WO2017200119A1 PCT/KR2016/005251 KR2016005251W WO2017200119A1 WO 2017200119 A1 WO2017200119 A1 WO 2017200119A1 KR 2016005251 W KR2016005251 W KR 2016005251W WO 2017200119 A1 WO2017200119 A1 WO 2017200119A1
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WIPO (PCT)
Prior art keywords
control channel
interference mitigation
terminal
channel interference
naics
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Ceased
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PCT/KR2016/005251
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English (en)
Korean (ko)
Inventor
박창환
우경수
윤석현
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LG Electronics Inc
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LG Electronics Inc
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Priority to PCT/KR2016/005251 priority Critical patent/WO2017200119A1/fr
Publication of WO2017200119A1 publication Critical patent/WO2017200119A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and a device for supporting a control channel interference mitigation technique in a wireless communication system.
  • 3GPP LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • MIMO multiple input multiple output
  • LTE-A 3GPP LTE-Advanced
  • FeICIC is a method of increasing the overall cell capacity by receiving data from a small cell by offloading the terminal to the small cell without allocating data in a predetermined subframe in the interfering macro cell. However, this technique avoids interference in the network rather than eliminating fundamental interference.
  • the 3GPP RAN Radio Access Network
  • the 3GPP RAN further increases the system capacity by defining a receiver-related standard that can directly control or eliminate inter-cell or inter-cell interference in order to fundamentally eliminate interference.
  • Interference elimination receiver is a Type 3i Interference Rejection Combining (IRC) receiver capable of canceling intercell interference through a linear equalizer in UMTS HSDPA, and an interference control receiver for CDMA in UMTS.
  • IRC receiver and the nonlinear IC (Interference Cancellation) receiver which apply almost the same concept to the receiver, remove the synchronization signal, the broadcasting channel and the RS of the interference cell. .
  • 3GPP Rel-12 has standardized a receiver capable of removing data and control signals of an interference cell, which is a Network Assistance Interference Cancellation and Suppression (NAICS) receiver.
  • NAICS Network Assistance Interference Cancellation and Suppression
  • the present invention proposes a method for the UE to apply a control channel interference mitigation technique and an apparatus supporting the same.
  • a method of applying a control channel interference mitigation technique by a terminal in a wireless communication system may include transmitting a control channel interference mitigation indicator indicating whether the terminal supports the control channel interference mitigation scheme to a serving base station and applying the control channel interference mitigation scheme.
  • the control channel interference mitigation technique may be any one of Minimum Mean Square Error-enhanced Interference Rejection Combination (MMSE-eIRC) or Minimum Mean Square Error-Interference Rejection Combination (MMSE-IRC).
  • the control channel interference mitigation indicator may be cch-IM-r13.
  • the control channel interference mitigation indicator may be 1 bit. If the control channel interference mitigation indicator indicates that the terminal supports the control channel interference mitigation scheme, the terminal may further include receiving a CRS assistance information list (CRS-AssistanceInfoList) from the serving base station. The terminal may further include performing interference mitigation for the data channel of the interfering cell based on the CRS auxiliary information list.
  • CRS assistance information list CRS assistance information list
  • the terminal may further include transmitting a NAICS capability list (naics-Capability-List-r12) indicating whether the terminal supports NAICS to the serving base station. If the control channel interference mitigation indicator indicates that the terminal supports the control channel interference mitigation scheme, and the NAICS capability list indicates that the terminal supports NAICS, the control channel interference mitigation scheme may be the MMSE-eIRC. have.
  • the terminal may further include receiving a CRS assistance information list (CRS-AssistanceInfoList) and NAICS assistance information (NAICS-AssistanceInfo) from the serving base station.
  • the terminal may further include performing interference mitigation for a control channel of an interfering cell based on the NAICS assistance information.
  • control channel interference mitigation indicator indicates that the terminal supports the control channel interference mitigation scheme
  • NAICS capability list indicates that the terminal does not support NAICS
  • the control channel interference mitigation scheme is the MMSE-IRC. Can be.
  • the terminal may further include receiving a CRS assistance information list (CRS-AssistanceInfoList) from the serving base station.
  • CRS-AssistanceInfoList CRS assistance information list
  • control channel interference mitigation indicator and the NAICS capability list may be combined and transmitted to the serving base station.
  • the MMSE-eIRC may have a higher complexity than the MMSE-IRC.
  • a terminal for applying a control channel interference mitigation technique in a wireless communication system includes a memory; Transceiver; And a processor connecting the memory and the transceiver, wherein the processor transmits a control channel interference mitigation indicator indicating whether the terminal supports the control channel interference mitigation technique to a serving base station, and reduces the control channel interference mitigation.
  • the control channel interference mitigation technique may be any one of Minimum Mean Square Error-enhanced Interference Rejection Combination (MMSE-eIRC) or Minimum Mean Square Error-Interference Rejection Combination (MMSE-IRC).
  • Interference mitigation for a control channel may be performed based on a previously defined terminal capability or feature.
  • 1 illustrates a wireless communication system
  • FIG. 2 shows a structure of a radio frame in 3GPP LTE.
  • FIG 3 shows an example of a resource grid for one downlink slot.
  • 5 shows a structure of an uplink subframe.
  • FIG. 6 illustrates an eICIC for solving the inter-cell interference problem and the inter-cell interference problem.
  • FIG. 10 illustrates a configuration in which a terminal applies a control channel interference mitigation technique according to an embodiment of the present invention.
  • FIG. 11 illustrates a method of applying a control channel interference mitigation technique by a terminal according to an embodiment of the present invention.
  • FIG. 12 is a block diagram illustrating a method in which a terminal applies a control channel interference mitigation technique according to an embodiment of the present invention.
  • FIG. 13 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
  • 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 by 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).
  • IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted.
  • LTE-A evolution of 3GPP LTE.
  • 1 illustrates a wireless communication system
  • the wireless communication system 10 includes at least one base station (BS) 11.
  • Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the UE 12 may be fixed or mobile and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, or a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
  • the base station 11 generally refers to a fixed station communicating with the terminal 12, and may be called in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like. have.
  • a terminal typically belongs to one cell, and a cell to which the terminal belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are relatively determined based on the terminal.
  • downlink means communication from the base station 11 to the terminal 12
  • uplink means communication from the terminal 12 to the base station 11.
  • the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
  • the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
  • the wireless communication system may be any one of a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MIS) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
  • MIMO multiple-input multiple-output
  • MIS multiple-input single-output
  • SISO single-input single-output
  • SIMO single-input multiple-output
  • the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
  • the MISO system uses multiple transmit antennas and one receive antenna.
  • the SISO system uses one transmit antenna and one receive antenna.
  • the SIMO system uses one transmit antenna and multiple receive antennas.
  • the transmit antenna means a physical or logical antenna used to transmit one signal or stream
  • the receive antenna means a physical or logical antenna used to receive one signal or stream.
  • FIG. 2 shows a structure of a radio frame in 3GPP LTE.
  • a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered with slots # 0 through # 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI may be referred to as a scheduling unit for data transmission. For example, one radio frame may have a length of 10 ms, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of subcarriers in the frequency domain.
  • the OFDM symbol is used to represent one symbol period since 3GPP LTE uses OFDMA in downlink, and may be called a different name according to a multiple access scheme.
  • SC-FDMA when SC-FDMA is used as an uplink multiple access scheme, it may be referred to as an SC-FDMA symbol.
  • a resource block (RB) includes a plurality of consecutive subcarriers in one slot in resource allocation units.
  • the structure of the radio frame is merely an example. Accordingly, the number of subframes included in the radio frame, the number of slots included in the subframe, or the number of OFDM symbols included in the slot may be variously changed.
  • 3GPP LTE defines that one slot includes 7 OFDM symbols in a normal cyclic prefix (CP), and one slot includes 6 OFDM symbols in an extended CP. .
  • CP normal cyclic prefix
  • Wireless communication systems can be largely divided into frequency division duplex (FDD) and time division duplex (TDD).
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
  • the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
  • the uplink transmission and the downlink transmission are time-divided in the entire frequency band, and thus the downlink transmission by the base station and the uplink transmission by the terminal cannot be simultaneously performed.
  • uplink transmission and downlink transmission are performed in different subframes.
  • FIG 3 shows an example of a resource grid for one downlink slot.
  • the downlink slot includes a plurality of OFDM symbols in the time domain and NRB resource blocks in the frequency domain.
  • the number NRB of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell.
  • the NRB may be any one of 60 to 110.
  • One resource block includes a plurality of subcarriers in the frequency domain.
  • the structure of the uplink slot may also be the same as that of the downlink slot.
  • Each element on the resource grid is called a resource element.
  • Resource elements on the resource grid may be identified by an index pair (k, l) in the slot.
  • an exemplary resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of OFDM symbols and the number of subcarriers in the resource block is equal to this. It is not limited. The number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, frequency spacing, and the like. For example, the number of OFDM symbols is 7 for a normal CP and the number of OFDM symbols is 6 for an extended CP. The number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.
  • the downlink subframe includes two slots in the time domain, and each slot includes seven OFDM symbols in the normal CP.
  • the leading up to 3 OFDM symbols (up to 4 OFDM symbols for 1.4Mhz bandwidth) of the first slot in the subframe are the control regions to which control channels are allocated and the remaining OFDM symbols are the physical downlink shared channel (PDSCH). Becomes the data area to be allocated.
  • PDSCH physical downlink shared channel
  • the PDCCH includes resource allocation and transmission format of downlink-shared channel (DL-SCH), resource allocation information of uplink shared channel (UL-SCH), paging information on PCH, system information on DL-SCH, and random access transmitted on PDSCH. Resource allocation of higher layer control messages such as responses, sets of transmit power control commands for individual UEs in any UE group, activation of voice over internet protocol (VoIP), and the like.
  • a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • the base station determines the PDCCH format according to the DCI to be sent to the terminal, and attaches a cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • RNTI a unique radio network temporary identifier
  • RNTI a unique radio network temporary identifier of the terminal, for example, a cell-RNTI (C-RNTI) may be masked to the CRC.
  • C-RNTI cell-RNTI
  • P-RNTI paging indication identifier, for example, p-RNTI (P-RNTI) may be masked to the CRC.
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • 5 shows a structure of an uplink subframe.
  • the uplink subframe may be divided into a control region and a data region in the frequency domain.
  • the control region is allocated a physical uplink control channel (PUCCH) for transmitting uplink control information.
  • the data region is allocated a physical uplink shared channel (PUSCH) for transmitting data.
  • the terminal may support simultaneous transmission of the PUSCH and the PUCCH.
  • PUCCH for one UE is allocated to an RB pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of the first slot and the second slot.
  • the frequency occupied by the resource block belonging to the resource block pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • the terminal may obtain a frequency diversity gain by transmitting uplink control information through different subcarriers over time.
  • m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe.
  • the uplink control information transmitted on the PUCCH includes a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / non-acknowledgement (NACK), a channel quality indicator (CQI) indicating a downlink channel state, and an uplink radio resource allocation request. (scheduling request).
  • HARQ hybrid automatic repeat request
  • ACK acknowledgment
  • NACK non-acknowledgement
  • CQI channel quality indicator
  • the PUSCH is mapped to the UL-SCH, which is a transport channel.
  • the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the TTI.
  • the transport block may be user information.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be a multiplexed transport block and control information for the UL-SCH.
  • control information multiplexed with data may include a CQI, a precoding matrix indicator (PMI), a HARQ, a rank indicator (RI), and the like.
  • the uplink data may consist of control information only.
  • FIG. 6 illustrates an eICIC for solving the inter-cell interference problem and the inter-cell interference problem. Specifically, FIG. 6 (a) shows the intercell interference problem, and FIG. 6 (b) shows the eICIC for solving the intercell interference problem.
  • the signal of the first cell is transmitted to the second cell. May interfere with the signal.
  • the signal of the second cell may act as an interference to the signal of the first cell.
  • the most fundamental way to solve this interference problem is to use different frequencies between cells. However, because frequency is a scarce and expensive resource, the solution of frequency division was not preferred by operators. Therefore, 3GPP attempts to solve such inter-cell interference by time division. To this end, 3GPP proposed enhanced inter-cell interference coordination (eICIC) as one of interference coordination methods.
  • eICIC enhanced inter-cell interference coordination
  • the time division scheme introduced in Rel-10 is called enhanced inter-cell interference coordination (ICIC), meaning that it has evolved compared to the existing frequency division scheme.
  • eICIC an interference cell may be defined as an attacker cell, and an interference cell may be defined as a victim cell.
  • the eICIC is a method of allowing an attacker cell to stop transmitting data in a specific subframe so that the terminal can maintain a connection with a victim cell in the corresponding subframe. In other words, when heterogeneous cells coexist with one another, one cell stops transmitting signals to a terminal that is significantly interrupted in a certain area so that the interference signal is hardly transmitted.
  • the specific subframe in which the data transmission is stopped may be called ABS (Almost Blank Subframe).
  • ABS Almost Blank Subframe
  • the essential control information is CRS. Accordingly, data is not transmitted on the subframe to which ABS is applied, and only CRS signals may be transmitted on symbols 0, 4, 7, and 11.
  • the UE may perform data transmission in the data region of the subframe of the first cell.
  • the second cell may apply eICIC to solve the interference. That is, when the eICIC is applied, the corresponding subframe may be operated according to the ABS, and no data may be transmitted in the data area. However, in the subframe operated according to the ABS, only the CRS may be transmitted on symbols 0, 4, 7, and 11.
  • Rel-11 adds a new Enhanced Enhanced Inter-cell Interference Coordination (FeICIC) feature that extends eICIC further to enable Cell Range Extension (CRE) up to 9 dB.
  • FeICIC Enhanced Enhanced Inter-cell Interference Coordination
  • CRE Cell Range Extension
  • a small cell having a small cell coverage radius may be added within the coverage of the existing cell. Furthermore, small cells are expected to handle more traffic. Since the existing cell has greater coverage than the small cell, it may be referred to as a macro cell.
  • the heterogeneous network will be described in detail.
  • a heterogeneous network is a network in which various kinds of cells are mixed and operated.
  • many nodes overlap each other, and a representative example may be a pico cell, a micro cell, a femto cell, or a home eNB.
  • pico cells can be installed in areas with high data service demands
  • femto cells can be installed in indoor offices or homes
  • wireless repeaters can be installed to supplement the coverage of macro cells. have.
  • the small cells may be a closed subscriber group (CSG) that can be used only by a specific user according to access restriction, an open access that allows a general user to access, and a hybrid type that uses a combination of both methods. hybrid access).
  • CSG closed subscriber group
  • IC Inter-cell interference
  • Pcell primary cell
  • Scell secondary cell
  • inter-cell interference may be further weighted.
  • CRS cell-specific reference signal
  • PBCH physical broadcasting channel
  • SCH sync channel
  • PDSCH PDSCH
  • the serving cell may request the terminal performance inquiry from the terminal as necessary or according to an indication by a higher layer (S910).
  • the terminal may provide the terminal performance information according to the request (S920). That is, the terminal, in response to the terminal capability inquiry, may inform the serving cell that the eICIC function and the interference cancellation (IC) capability (capability) through the terminal capability information. On the other hand, when the radio access capability of the terminal is changed, the upper layer of the terminal may instruct the upper layer of the serving cell to request the capability inquiry.
  • the terminal in response to the terminal capability inquiry, may inform the serving cell that the eICIC function and the interference cancellation (IC) capability (capability) through the terminal capability information.
  • the upper layer of the terminal may instruct the upper layer of the serving cell to request the capability inquiry.
  • the serving cell may determine whether the neighboring cell is an attacker cell causing interference by exchanging information with the neighboring cell (S930). When the neighboring cell is an attacker cell causing interference, the serving cell may obtain information on any channel of the neighboring cell.
  • the serving cell may transmit interference cancellation assistance information including information on the obtained arbitrary channel to the terminal (S940).
  • the serving cell may transmit a signal to the terminal (S950).
  • the terminal may perform interference cancellation (S960).
  • the SINR of the signal from the serving cell can be further improved, resulting in a performance gain.
  • the signal or channel that is the object of interference cancellation may be CRS, PBCH, SCH (Sync Channel), PDSCH (Physical downlink shared channel).
  • the receiver the so-called Interference Cancellation (IC) receiver, or the IRC (Interference Rejection Combiner) receiver, to which the interference canceller 900 is added, may be conceptually implemented by subtracting the interference signal from the received signal.
  • the complexity of the receiver to which the interference canceling unit is added may be determined according to the maximum number of cells to be interference canceled and the type of signal to be removed.
  • FIG. 9 an operation of performing interference cancellation on up to two interference sources is shown as a block.
  • the signal to be interference canceled may be CRS, PBCH, SCH, PDSCH, or the like.
  • the IC receiver or the IRC receiver can obtain a large performance gain, especially under an environment where interference from neighboring base stations is dominant.
  • An interference cancellation (IC) receiver may estimate, regenerate, and remove a signal transmitted from an interference cell from a received signal. This may improve the reception performance by increasing the signal-to-noise ratio of the signal coming from the serving cell.
  • the operation of the interference cancellation (IC) may be accompanied by the channel estimation of the signal to be removed and the estimation of transmission data of the signal to be removed. At this time, if the transmission data of the signal to be removed, such as CRS-IC, PSCH-IC, SSCH-IC is a predefined sequence, this process is omitted, the reliability of the interference cancellation (IC) can be increased.
  • the LMMSE-IRC receiver of Rel-11 may perform interference control by maximizing reception SINR by reception beamforming using two reception antennas for the purpose of neighbor cell interference control of a cell boundary terminal.
  • the Rel-11 nonlinear IC receiver receives an RRC signal named CRS-AssistanceInfo-r11 containing information such as Cell ID, CRS antenna port, MBSFN configuration, etc.
  • the broadcast channel and the CRS can be removed. This may improve the channel estimation performance by removing the CRS of the interfering cell, or may improve the reception performance by removing the CRS of the interfering cell that affects the data region of the serving signal.
  • CRS-IC is a receive function that must be implemented for the Rel-11's FeICIC.
  • a crs-InterfHandl-r11 field is defined to indicate whether the terminal supports CRC interference handling.
  • the ss-CCH-InterfHandl-r11 field is defined to indicate whether the terminal supports synchronization signal interference handling and common channel interference handling.
  • Re1-12 newly proposed a Network Assisted Interference Cancellation Scheme (NAICS) technology that suppresses or eliminates inter-cell and inter-terminal interference at the receiving end with network support.
  • NAICS Network Assisted Interference Cancellation Scheme
  • the NAICS receiver reflects the interference cancellation requirement for the data channel of the interference source in addition to the existing RS IC or IRC receiver.
  • the NAICS receiver may use the interfering signal information transmitted through the network to remove the interfering signal by the data channel within or between cells. For example, when the reception of the terminal 1 is received by mixing the signal of the terminal 2 which is the inter-cell interference source, the reception unit of the terminal 1 detects the desired reception signal using the network assisted information (network assisted information) Can be removed before.
  • the network assistance information may be transmitted through a backhaul which is a signal transmission path between base stations. Through this, it is possible to effectively receive the signal with improved SIR. As a result, the reception rate can be improved in the cell or inter-cell boundary region.
  • the information on the interference signal informed by the network may mean scheduling information or downlink control information (DCI) allocated to a terminal of a neighbor cell.
  • the interfering signal information may be shared between the base stations through the backhaul, and the shared scheduling information and the downlink control information of the interfering base station may be transmitted through the RRC signal transmission from the serving base station to the corresponding terminal.
  • the terminal may directly detect and use interference signal information for some information.
  • Blind detection refers to detecting scheduling information or downlink control information used for interference data by using characteristics of the interference signal without interference signal information of a network when interference data of an adjacent cell enters a resource allocated by a terminal of a serving cell. .
  • the advanced receiver considering interference in LTE is a MMSE-IRC receiver of Rel-10, a FeICIC receiver of Rel-11, and a NAICS of Rel-12 in order to improve the yield of a terminal located at a cell boundary in an interference limited environment. It gradually evolved into a receiver.
  • MMSE-IRC receivers do not consider network signals, while FeICIC receivers and NAICS receivers consider network signals.
  • MMSE-IRC receivers consider homogeneous network scenarios, while FeICIC receivers and NAICS receivers consider heterogeneous network scenarios.
  • the MMSE-IRC receiver is a linear interference receiver, while the FeICIC receiver and NAICS receiver are non-linear interference receivers.
  • conventional advanced receivers eg, MMSE-IRC, FeICIC, and NAICS
  • PCFICH, PHICH, PDCCH, ePDCCH control channels
  • the present invention proposes a method for the UE to apply a control channel interference mitigation technique and an apparatus supporting the same.
  • the terminal supporting the MMSE-IRC of the Re1-10 may be referred to as an MMSE-IRC terminal
  • the terminal supporting the FeICIC of the Re1-11 may be referred to as a FeICIC terminal
  • the terminal supporting the NAICS of the Rel-12 May be referred to as a NAICS terminal.
  • the MMSE-IRC terminal and / or the CRS-IC terminal may be sufficient to improve PDSCH performance.
  • the intermediate SIR environment may appear mainly in homogeneous network environments.
  • the intermediate SIR environment may refer to an environment in which SIR> -6 dB in general. That is, in the intermediate SIR environment, the performance improvement of the NAICS terminal may not be observed as a whole.
  • the performance improvement of the control channel may have similar characteristics between MMSE-eIRC and MMSE-IRC. Therefore, for a terminal without FeICIC or NAICS capability, it is possible to apply a MMSE-IRC receiver having a relatively low complexity to control channel demodulation to improve RLM and PDSCH performance.
  • the low SIR environment may appear mainly in heterogeneous network environments.
  • the low SIR environment may mean an environment in which SIR ⁇ -6 dB in general.
  • the low SIR should be handed over to the interference cell by the terminal, but may occur in a scenario (eg, FeICIC) that offloads the terminal to the low SIR cell due to cell yield in the network. That is, in order to improve PDSCH performance, the UE may need CRS-IC capability and PDSCH-IC capability.
  • the CRS-IC capability of the terminal may be a core capability of the terminal for supporting FeICIC
  • the PDSCH-IC capability may be a core capability of the terminal for supporting NAICS.
  • the MMSE-eIRC can show a control channel performance improvement of about 4 dB compared to the MMSE-IRC.
  • the performance improvement of the MMSE-IRC and the MMSE-eIRC may be significantly different from that of the basic receiver according to the environment.
  • MMSE-IRC and MMSE-eIRC can be very different in terms of complexity.
  • MMSE-eIRC capability may be supported in order to overcome performance degradation of a control channel in a heterogeneous network environment.
  • the terminal may support the MMSE-IRC capability, which is relatively low in complexity and improves performance compared to the basic receiver.
  • the present invention newly defines a control channel interference mitigation indicator indicating whether the terminal supports the control channel interference mitigation technique in order to apply the control channel interference mitigation technique, and this is crs-InterfHandl-r11 of Rel-11. Or in combination with the naics-Capability-List-r12 of Rel-12, we propose a method for distinguishing the operating environment of the control channel interference recognition receiver. Table 1 below is a description of the terminal radio access capability of the 3GPP TS36.306.
  • Table 1 4 UE radio access capability parameters 4.3 Parameters independent of the field ue-Category and ue-CategoryDL / ue-CategoryUL 4.3.4 Physical layer parameters 4.3.4.15 crs-InterfHandl-r11 This field defines whether the UE supports CRS interference handling. It is mandatory for UEs of this release of the specification, except for Category 0 UEs. 4.3.4.20 ss-CCH-InterfHandl-r11 This field defines whether the UE supports synchronization signal and common channel interference handling if the UE supports crs-InterfHandl-r11. It is mandatory for UEs of this release of the specification to support this feature for TDD bands, except for Category 0 UEs.
  • naics-Capability-List-r12 This field indicates that the UE supports NAICS, ie receiving assistance information from serving cell and using it to cancel or suppress interference of a neighboring cell for at least one band combination. For each entry of the list, the NAICS capability for a band combination is indicated as a combination of numberOfNAICSCapableCC and numberOfAggregatedPRB.
  • crs-InterfHandl-r11, ss-CCH-InterfHandl-r11, and naics-Capability-List-r12 are defined in the conventional standard.
  • the control channel interference mitigation indicator indicating whether the terminal supports the control channel interference mitigation scheme may be newly defined in order for the terminal to apply the control channel interference mitigation scheme.
  • the control channel interference mitigation indicator may be cch-IM-r13 (Control Channel Interference Mitigation).
  • the control channel interference mitigation indicator may be 1 bit.
  • the control channel interference mitigation indicator may indicate whether the terminal supports control channel interference mitigation. That is, it may be indicated whether it is possible to suppress interference of control channels (eg, PCFICH, PHICH, PDCCH, and ePDCCH) from neighboring cells.
  • control channels eg, PCFICH, PHICH, PDCCH, and ePDCCH
  • the reference interference mitigation technique required for control channel interference mitigation is either MMSE-eIRC or MMSE-IRC depending on the interference environment. For example, if the terminal supports crs-InterfHandl-r11 and naics-Capability-List-r12, the terminal may support MMSE-eIRC. If the terminal does not support naics-Capability-List-r12, the reference interference mitigation technique may be MMSE-IRC.
  • MMSE-IRC may be a reference interference mitigation technique.
  • a terminal supporting at least one of these capabilities may receive the CRS-AssistanceInfoList-r11 from the serving cell and use the CRS-AssistanceInfoList-r11 to remove the CRS from the neighbor cell corresponding to the CRS-AssistanceInfoList-r11. .
  • Table 2 below is a description of the radio resource control of the 3GPP TS36.331.
  • naics-Capability-List-r12 is defined in the conventional standard. There is a need to further define a list of control channel interference mitigation capabilities. Table 3 below shows parameters to be newly defined for control channel interference mitigation according to an embodiment of the present invention.
  • FIG. 10 illustrates a configuration in which a terminal applies a control channel interference mitigation technique according to an embodiment of the present invention.
  • crs-InterfHandl-r11 of Rel-11, ss-CCH-InterfHandl-r11 of Rel-11 or naics-Capability-List-r12 of Rel-12 and newly defined cch-IM-Capability-List Through the combination of -r13, it is possible to determine whether to apply MMSE-IRC or MMSE-eIRC as a control channel interference mitigation technique.
  • FIG. 11 illustrates a method of applying a control channel interference mitigation technique by a terminal according to an embodiment of the present invention.
  • the first base station may perform parameter adjustment with the second base station (S1100).
  • the first base station may transmit a PDCCH to a terminal within coverage (S1110).
  • the PDCCH may be transmitted at aggregation level 1, 2, 4 or 8.
  • the aggregation level may be adjusted based on the size of PDCCH information.
  • the aggregation level may be 4 or 8.
  • an aggregation level may be 1, 2, 4, or 8.
  • the terminal may transmit the channel interference mitigation indicator to the first base station that is the serving base station (S1120).
  • the channel interference mitigation indicator may indicate whether the terminal supports a control channel interference mitigation technique.
  • the channel interference mitigation indicator may be cch-IM-r13.
  • the channel interference mitigation indicator may be 1 bit.
  • the first terminal does not support the control channel interference mitigation scheme
  • the second terminal and the third terminal are assumed to support the control channel interference mitigation scheme
  • the first terminal may transmit a control channel interference mitigation indicator to the first base station (S1121).
  • the control channel interference mitigation indicator may indicate that the first terminal does not support the control channel interference mitigation scheme.
  • the second terminal may transmit a control channel interference mitigation indicator to the first base station (S1122).
  • the control channel interference mitigation indicator may indicate that the second terminal supports the control channel interference mitigation scheme.
  • the second terminal may transmit a NAICS capability list off (naics-capability-list-r12 off).
  • the second terminal may receive the CRS-AssistanceInfoList from the base station (S1131). That is, the second terminal may apply the MMSE-IRC to mitigate control channel interference.
  • the third terminal may transmit a control channel interference mitigation indicator to the first base station (S1123).
  • the control channel interference mitigation indicator may indicate that the third terminal supports the control channel interference mitigation scheme.
  • the third terminal may transmit a NAICS capability list on (naics-capability-list-r12 on).
  • the third terminal may receive the CRS-AssistanceInfoList and the NAICS-AssistanceInfo from the base station (S1132). That is, the third terminal may apply the MMSE-eIRC to mitigate control channel interference.
  • the first base station may perform parameter adjustment with the second base station (S1140).
  • the first base station may transmit a PDCCH to the first terminal (S1151).
  • the PDCCH may be transmitted at aggregation level 1, 2, 4 or 8.
  • the aggregation level may be adjusted based on the size of PDCCH information.
  • the aggregation level may be 4 or 8.
  • the aggregation level may be 1, 2, 4, or 8.
  • the first base station may transmit a PDCCH to the second terminal (S1152).
  • the PDCCH may be transmitted at aggregation level 1, 2, 4 or 8.
  • the aggregation level may be adjusted based on the PDCCH information size, the second terminal capability and the second base station parameter.
  • the aggregation level may be 4 or 8.
  • the aggregation level may be 1, 2, 4, or 8.
  • the first base station may transmit a PDCCH to the third terminal (S1152).
  • the PDCCH may be transmitted at aggregation level 1, 2, 4 or 8.
  • the aggregation level may be adjusted based on the PDCCH information size, the third terminal capability and the second base station parameter.
  • the aggregation level may be 4 or 8.
  • the aggregation level may be 1, 2, 4, or 8.
  • FIG. 12 is a block diagram illustrating a method in which a terminal applies a control channel interference mitigation technique according to an embodiment of the present invention.
  • the terminal may transmit a control channel interference mitigation indicator to the serving base station indicating whether the terminal supports the control channel interference mitigation scheme (S1210).
  • the control channel interference mitigation indicator may be cch-IM-r13.
  • the control channel interference mitigation indicator may be 1 bit. If the control channel interference mitigation indicator indicates that the terminal supports the control channel interference mitigation scheme, the terminal may receive a CRS assistance information list (CRS-AssistanceInfoList) from the serving base station. Subsequently, the terminal may perform interference mitigation on the data channel of the interfering cell based on the CRS auxiliary information list.
  • CRS assistance information list CRS assistance information list
  • the terminal may apply the control channel interference mitigation technique (S1220).
  • the control channel interference mitigation technique may be any one of Minimum Mean Square Error-enhanced Interference Rejection Combination (MMSE-eIRC) or Minimum Mean Square Error-Interference Rejection Combination (MMSE-IRC).
  • MMSE-eIRC Minimum Mean Square Error-enhanced Interference Rejection Combination
  • MMSE-IRC Minimum Mean Square Error-Interference Rejection Combination
  • the terminal may transmit a NAICS capability list (naics-capability-list-r12) indicating whether the terminal supports NAICS to the serving base station. If the control channel interference mitigation indicator indicates that the terminal supports the control channel interference mitigation scheme, and the NAICS capability list indicates that the terminal supports NAICS, the control channel interference mitigation scheme may be the MMSE-eIRC. have.
  • the terminal may receive a CRS assistance information list (CRS-AssistanceInfoList) and NAICS assistance information (NAICS-AssistanceInfo) from the serving base station.
  • the terminal may perform interference mitigation for a control channel of an interfering cell based on the NAICS assistance information.
  • the terminal may transmit a NAICS capability list (naics-capability-list-r12) indicating whether the terminal supports NAICS to the serving base station. If the control channel interference mitigation indicator indicates that the terminal supports the control channel interference mitigation scheme, and the NAICS capability list indicates that the terminal does not support NAICS, the control channel interference mitigation scheme is the MMSE-IRC. Can be.
  • the terminal may receive a CRS assistance information list (CRS-AssistanceInfoList) from the serving base station. That is, the terminal may not receive NAICS assistance information (NAICS-AssistanceInfo).
  • control channel interference mitigation indicator and the NAICS capability list may be combined and transmitted to the serving base station.
  • FIG. 13 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
  • the base station 1300 includes a processor 1301, a memory 1302, and a transceiver 1303.
  • the memory 1302 is connected to the processor 1301 and stores various information for driving the processor 1301.
  • the transceiver 1303 is connected to the processor 1301 to transmit and / or receive a radio signal.
  • the processor 1301 implements the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 1301.
  • the terminal 1310 includes a processor 1311, a memory 1312, and a transceiver 1313.
  • the memory 1312 is connected to the processor 1311 and stores various information for driving the processor 1311.
  • the transceiver 1313 is connected to the processor 1311 to transmit and / or receive a radio signal.
  • the processor 1311 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the terminal may be implemented by the processor 1311.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the transceiver may include baseband circuitry for processing wireless signals.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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

Abstract

L'invention concerne un procédé permettant à un terminal d'appliquer une technique d'atténuation d'interférence de canal de commande dans un système de communication sans fil ; et un dispositif pour permettre son fonctionnement. Le terminal transmet, à une station de base de desserte, un indicateur d'atténuation d'interférence de canal de commande pour indiquer si le terminal prend en charge ou pas la technique d'atténuation d'interférence de canal de commande, et applique la technique d'atténuation d'interférence de canal de commande, la technique d'atténuation d'interférence de canal de commande pouvant être une combinaison de rejet d'interférence améliorée à erreur quadratique moyenne minimale (MMSE-eIRC) ou une combinaison de rejet d'interférence à erreur quadratique moyenne minimale (MMSE-IRC).
PCT/KR2016/005251 2016-05-18 2016-05-18 Procédé d'application de technique d'atténuation d'interférence de canal de commande par un terminal, et dispositif associé Ceased WO2017200119A1 (fr)

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PCT/KR2016/005251 WO2017200119A1 (fr) 2016-05-18 2016-05-18 Procédé d'application de technique d'atténuation d'interférence de canal de commande par un terminal, et dispositif associé

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113543081A (zh) * 2020-04-20 2021-10-22 维沃移动通信有限公司 一种信息传输方法及终端
US20220183015A1 (en) * 2020-12-07 2022-06-09 Samsung Electronics Co., Ltd. Apparatus and method for inter-cell interference control for wireless communication system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140233466A1 (en) * 2013-02-21 2014-08-21 Research In Motion Limited Methods of Interference Measurement for Advanced Receiver in LTE/LTE-A
WO2015113238A1 (fr) * 2014-01-29 2015-08-06 Telefonaktiebolaget L M Ericsson(Publ) Procédés de traitement d'informations d'assistance pour l'atténuation du brouillage
US20150372778A1 (en) * 2014-06-18 2015-12-24 Qualcomm Incorporated Naics signaling for advanced lte features
US20150373732A1 (en) * 2014-06-23 2015-12-24 Intel Corporation User equipment and methods for csi enhancements using interference cancellation and suppression receivers
WO2016024731A1 (fr) * 2014-08-12 2016-02-18 엘지전자 주식회사 Procédé pour établir un rapport d'état de canal dans un système de communication sans fil et appareil associé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140233466A1 (en) * 2013-02-21 2014-08-21 Research In Motion Limited Methods of Interference Measurement for Advanced Receiver in LTE/LTE-A
WO2015113238A1 (fr) * 2014-01-29 2015-08-06 Telefonaktiebolaget L M Ericsson(Publ) Procédés de traitement d'informations d'assistance pour l'atténuation du brouillage
US20150372778A1 (en) * 2014-06-18 2015-12-24 Qualcomm Incorporated Naics signaling for advanced lte features
US20150373732A1 (en) * 2014-06-23 2015-12-24 Intel Corporation User equipment and methods for csi enhancements using interference cancellation and suppression receivers
WO2016024731A1 (fr) * 2014-08-12 2016-02-18 엘지전자 주식회사 Procédé pour établir un rapport d'état de canal dans un système de communication sans fil et appareil associé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113543081A (zh) * 2020-04-20 2021-10-22 维沃移动通信有限公司 一种信息传输方法及终端
US20220183015A1 (en) * 2020-12-07 2022-06-09 Samsung Electronics Co., Ltd. Apparatus and method for inter-cell interference control for wireless communication system
US12219587B2 (en) * 2020-12-07 2025-02-04 Samsung Electronics Co., Ltd Apparatus and method for inter-cell interference control for wireless communication system

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