WO2015174801A1 - 무선 통신 시스템에서 간섭을 제거하고 신호를 수신하는 방법 및 장치 - Google Patents
무선 통신 시스템에서 간섭을 제거하고 신호를 수신하는 방법 및 장치 Download PDFInfo
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Classifications
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- 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
- H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
-
- 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
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
- H04W8/24—Transfer of terminal data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
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- H04J2211/005—Long term evolution [LTE]
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method for removing interference and receiving a signal and a device supporting the same in a wireless communication system.
- Multi-Input Multi-Output (MIMO) technology improves the efficiency of data transmission and reception by using multiple transmit antennas and multiple receive antennas, eliminating the use of one transmit antenna and one receive antenna.
- MIMO Multi-Input Multi-Output
- the receiving side receives data through a single antenna path, but if multiple antennas are used, the receiving end receives data through several paths. Therefore, the data transmission speed and the transmission amount can be improved, and the coverage can be increased.
- Single-cell MIMO operation includes a single user-MIMO (SU-MIMO) scheme in which one UE receives a downlink signal in one cell and two or more UEs perform a single-cell MIMO operation.
- the cell may be divided into a multi-user-MIMO (MU-MIM0) scheme for receiving a downlink signal from a cell.
- SU-MIMO single user-MIMO
- MU-MIM0 multi-user-MIMO
- Channel estimation refers to a process of restoring a received signal by compensating for distortion of a signal caused by fading.
- fading refers to a phenomenon in which a signal intensity fluctuates rapidly due to multipath-time delay in a wireless communication system environment.
- a reference signal known to both the transmitter and the receiver is required.
- the reference signal may simply be referred to as a pilot (Pi lot) according to the RSCReference Signal) or the applicable standard.
- the downlink reference signal is a coherent such as a Physical Downlink Shared CHannel (PDSCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid Indicator CHannel (PHICH), or a Physical Downlink Control CHannel (PDCCH). (coherent) Pilot signal for demodulation.
- the downlink reference signal is a common reference signal (CRS) shared by all terminals in the cell and only for a specific terminal. There is a dedicated reference signal (DRS).
- LTE-based systems with extended antenna configurations e.g. LTE-supporting 8 transmit antennas
- conventional communication systems supporting 4 transmit antennas e.g., systems according to the LTE release 8 or 9 standard).
- DRS-based data demodulation is considered to support efficient reference signal operation and advanced transmission scheme. That is, DRSs for two or more layers may be defined to support data transmission through an extended antenna. Since the DRS is precoded by the same precoder as the data, channel information for demodulating data at the receiving side can be easily estimated without additional precoding information.
- the system according to the LTE-A standard may define a reference signal, that is, CSI-RS, for acquiring channel state information (CSI) at a receiving side.
- CSI-RS channel state information
- the terminal removes network cooperative interference (NAICS, Network-assisted Interference Cance l).
- NAICS Network-assisted Interference Cance l
- Lat ion and Suppress ion method for receiving a signal comprising the steps of transmitting the terminal capability information including band combination information indicating the band combination supported by the terminal at the carrier junction; And receiving the signal based on the terminal capability information, and the band combination information may include indication information indicating whether the NAICS is supported for the band combination.
- the indication information may indicate that the terminal supports the network cooperative interference cancellation when included in the band combination information.
- the indication information may include a maximum number of CC Component Carriers supporting the NAICS for the band combination based on the band combination information.
- the indication information may include a maximum bandwidth value for supporting the NAICS for the band combination corresponding to the band combination information.
- the indication information includes a bitmap, and each bit of the bitmap is a combination of a maximum number of component carriers (CC) supporting the NAICS and a maximum bandwidth value supporting the NAICS. Can be grand.
- CC component carriers
- the number of Cos on Reference Signal (CRS) ports of the interference cell may be determined as 2.
- NAICS Network-assisted interference cancellation
- RF Radio Frequency
- the terminal for receiving a signal by using, RF (Radio Frequency) unit; And a processor, wherein the processor transmits terminal capability information including band combination information indicating a band combination supported by the terminal in the carrier concatenation, receives the signal based on the terminal capability information,
- the band combination information may include indication information indicating whether the network cooperative interference cancellation is supported for the band combination.
- the indication information may indicate that the terminal supports the network cooperative interference cancellation when included in the bend combination information.
- the indication information may include the maximum number of component carriers (CCs) that support the network cooperative interference cancellation for the band combination that is performed on the band combination information.
- CCs component carriers
- the band combination information may include a maximum bandwidth value for supporting the network cooperative interference cancellation for the band combination based on the band combination information.
- the indication information consists of a bitmap, and each bit of the bitmap is based on a combination of the maximum number of XComponent carriers supporting the NAICS and the maximum bandwidth value supporting the NAICS. can do.
- the indication information is included in the band combination information, the number of Cos on Reference Signal (CRS) ports of the interference cell may be determined as 2.
- a method for removing interference and receiving a signal in a wireless communication system and an apparatus supporting the same can be provided.
- 1 illustrates a structure of a downlink radio frame.
- FIG. 2 illustrates an example of a resource grid for one downlink slot.
- 3 illustrates a structure of a downlink subframe.
- tr 4 is a diagram illustrating a structure of an uplink subframe.
- T 5 is a configuration diagram of a wireless communication system having multiple antennas.
- Tr 6 is a diagram illustrating a pattern of a conventional CRS and DRS.
- Rz 7 is a diagram illustrating an example of a DM RS pattern.
- FIG. 9 is a diagram for explaining an example of a method in which the CSI-RS is periodically transmitted.
- FIG. 10 is a diagram for explaining an example of a method in which a CSI-RS is transmitted aperiodically.
- FIG. 11 is a diagram for explaining an example in which two CSI-RS configurations (conf igurat ion) are used.
- FIG. 12 shows a general interference environment of a downlink system.
- FIG. 13 shows an example of TMs of neighbor cells according to Tr iggering subframe set information.
- FIG. 14 illustrates a flowchart according to an embodiment of the present invention.
- FIG. 15 is a diagram illustrating a configuration of a base station and a terminal that can be applied to an embodiment of the present invention.
- each component or feature may be considered optional unless stated otherwise.
- Each component or feature may be implemented in a form not combined with other components or features.
- some of the components and / or features may be combined to form an embodiment of the present invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment or may be substituted for components or features of another embodiment. .
- the base station has a meaning as a terminal node of the network that directly communicates with the terminal.
- the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
- BS Base station ion
- eNB Node B
- AP access point
- the repeater may be replaced by terms such as Rel ay Node (RN) and Relay Stat on (RS).
- 'Terminal 1 ' may be replaced with terms such as a user equipment (UE), a mobile stat ion (MS), a mobile scribing stat ion (MSS), and a subscribing stat ion (SS).
- UE user equipment
- MS mobile stat ion
- MSS mobile scribing stat ion
- SS subscribing stat ion
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all the terms disclosed in this document can be described by the standard document.
- 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
- CDMA may be implemented by a radio technology such as UTRACUniversal Terrestrial Radio Access) or CDMA2000.
- TDMA may be implemented by wireless technologies such as Global System for Mobile Communications (GSM) / Gener a 1 Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile Communications
- GPRS Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- 0FDMA may be implemented with 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 UMTS Jniversal Mobile Telecom unicat ions System.
- the 3GPP LTEdong term evolution (3GPP) is part of the Evolved UMTS (E-UMTS) using E-UTRA, which employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced is the evolution of 3GPP LTE.
- WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system).
- IEEE 802.16e WiMA-OFDMA Reference System
- advanced IEEE 802.16m WiMA-OFDMA Advanced system
- a structure of a downlink radio frame will be described with reference to FIG. 1.
- uplink / downlink data packet transmission is performed in subframe units, and one subframe includes a plurality of 0FDM symbols. It is defined as a time interval.
- 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 it takes for one subframe to be transmitted is called a TTKtransmission time interval).
- the length of one subframe may be 1 ms
- the length of one slot may be 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.
- RB resource blocks
- a Resource Block (RB) is a resource allocation unit and may include a plurality of consecutive subcarriers in one slot. have.
- the number of 0FDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
- CP includes extended CP and extended CP normal CP.
- the number of 0FDM symbols included in one slot may be 7.
- the length of one 0FDM symbol is increased.
- the number of 0FDM symbols included in one slot is smaller than that of a normal CP.
- the number of 0FDM 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 slot When a normal CP is used, one slot includes 7 0FDM symbols, so one subframe includes 14 0FDM symbols.
- the first two or three 0FDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining 0FDM symbols may be allocated to a physical downlink shared channel (PDSCH).
- PDCCH physical downlink control channel
- PDSCH physical downlink shared channel
- the structure of the radio frame is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of symbols included in the slot may be variously changed.
- 2 shows an example of a resource grid for one downlink slot. This is the case in which an OFDM symbol consists of a normal CP.
- the downlink slot includes a plurality of OFDM symbols in the time domain and includes a plurality of resource blocks in the frequency domain.
- one downlink slot includes 7 OFDM symbols and one resource block includes 12 subcarriers as an example, but the present invention is not limited thereto.
- Each element on the resource grid is called a resource element (RE).
- RE resource element
- the resource element a becomes a resource element located in the k th subcarrier and the 1 st OFDM symbol.
- one resource block includes 12 X 7 resource elements (in the case of an extended CP, it includes 12 X 6 resource elements). Since the interval of each subcarrier is 15 kHz, one resource block includes about 180 kHz in the frequency domain.
- NDL is the number of resource blocks included in a downlink slot. The value of NDL may be determined according to the downlink transmission bandwidth set by the scheduling of the base station.
- PDSCH Physical Downlink Shared Channel
- the basic unit of transmission is one subframe. That is, PDCCH and PDSCH are allocated over two slots.
- Downlink control channels used in the 3GPP LTE system include, for example, a physical control format indicator channel (PCFICH), a physical downlink ink control channel (PDCCH), physical HARQ indicator channel (Physi cal Hybr id automat ic repeat request Indicator Channel; PHICH).
- PCFICH physical control format indicator channel
- PDCCH physical downlink ink control channel
- PHICH Physical HARQ indicator channel
- the PCFICH is transmitted in the first 0FDM symbol of a subframe and includes information on the number of 0FDM symbols used for control channel transmission in the subframe.
- the PHICH includes HARQ ACK / NACK signals as a male to female of uplink transmission.
- Control information transmitted through the PDCCH is referred to as Downlink Control Information (DCI).
- the DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain terminal group.
- the PDCCH includes a resource allocation and transmission format of a DL shared channel (DL-SCH), resource allocation information of a UL shared channel (UL-SCH), paging information of a paging channel (PCH), system information on a DL-SCH, and a PDSCH.
- Resource allocation of upper layer control messages such as random access responses sent to the network, and individual within any terminal group It may include a set of transmit power control commands for the terminal, transmit power control information, activation of voice over IP (VoIP), and the like.
- a plurality of PDCCHs may be transmitted in the control region.
- the terminal may monitor the plurality of PDCCHs.
- the PDCCH is transmitted in a combination of one or more consecutive Control Channel Elements (CCEs).
- CCE is a logical allocation unit used to provide a PDCCH at a coding rate based on the state of a radio channel.
- the CCE processes multiple resource element groups.
- the format of the PDCCH and the number of available bits 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 transmitted to the terminal, and adds a Cyclic Redundancy Check (CRC) to the control information.
- CRC Cyclic Redundancy Check
- the CRC is masked with an identifier called Radio Network Temporary Ident if ier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific UE, the cel 1 -RNTI (C-RNTI) identifier of the UE may be masked to the CRC.
- RNTI Radio Network Temporary Ident if ier
- a paging indicator identifier may be masked to the CRC.
- the PDCCH is for system information (more specifically, system information block (SIB))
- SIB system information block
- RNTKSI-RNTI may be masked to the CRC.
- random access -RNTKRA-RNTI may be masked to the CRC.
- 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) including uplink control information.
- a physical uplink ink shared channel (PUSCH) including user data is allocated to the data area.
- PUCCH Physical Uplink Control Channel
- PUSCH physical uplink ink shared channel
- PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. This is called a resource block pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- the MUL0 (Mul t iple Input Mul t iple Output) system is a system that improves the transmission and reception efficiency of data using multiple transmission antennas and multiple reception antennas. Rather than relying on a single antenna path to receive the entire message, the entire data can be received by combining a plurality of pieces of data received through the plurality of antennas.
- the MIM0 technology includes a spatial diversity scheme and a spatial multiplexing technique.
- Spatial diversity scheme can increase the transmission reliability (rel i abi l i ty) or widen the cell radius through diversity gain, which is suitable for data transmission for a mobile terminal moving at high speed.
- Spatial multiplexing can increase data transmission without increasing the bandwidth of the system by simultaneously transmitting different data.
- FIG. 5 is a configuration diagram of a wireless communication system having multiple antennas.
- the theoretical channel is proportional to the number of antennas, unlike when only a plurality of antennas are used in a transmitter or a receiver.
- the transmission capacity is increased. Therefore, the transmission rate can be improved and the frequency efficiency can be significantly improved.
- the transmission rate may theoretically increase as the rate of increase rate Ri multiplied by the maximum transmission rate Ro when using a single antenna.
- the transmission signal if there are NT transmission antennas, the maximum information that can be transmitted is NT.
- the transmission information may be expressed as follows.
- Each transmission information S ⁇ , S 1, '' ⁇ S N T may have a different transmission power. If each transmission power is ⁇ 2 ' '"' ' ⁇ ⁇ , the transmission information whose transmission power is adjusted may be expressed as follows.
- S may be expressed as follows using diagonal matrix 3 of transmission power.
- W is also called a precoding matrix
- the transmission signal X may be considered in different ways depending on two cases (for example, spatial diversity and spatial multiplexing).
- spatial multiplexing different signals are multiplexed and the multiplexed signal is transmitted to the receiver, so that the elements of the information vector (s) have different values.
- spatial diversity the same signal is repeatedly transmitted through a plurality of channel paths so that the elements of the information vector (s) have the same value.
- a combination of spatial multiplexing and spatial diversity techniques can also be considered. That is, the same signal may be transmitted according to a spatial diversity scheme through three transmission antennas, for example, and the remaining signals may be spatially multiplexed and transmitted to a receiver.
- the received signals of each antenna, ''' , : 1 ⁇ 2 « may be expressed as vectors as follows.
- channels may be classified according to transmit / receive antenna indexes.
- the channel from the transmitting antenna j to the receiving antenna i is denoted by 3 ⁇ 4. Note that in 3 ⁇ 4, the order of the index is the receive antenna index first, and the index of the transmit antenna is later.
- FIG. 5 (b) shows a channel from NT transmit antennas to receive antenna i.
- the channels may be bundled and displayed in the form of a vector and a matrix.
- a channel arriving from a total of NT transmit antennas to a receive antenna i may be represented as follows.
- the real channel is added with white noise (GN) after passing through the channel matrix H.
- the white noise «1 3/4 added to each of the NR receive antennas may be expressed as follows.
- the received signal may be expressed as follows.
- channel state-number of rows and columns of the representing channel matrix ⁇ It is determined by the number of transmit and receive antennas.
- the number of rows is equal to the number of receiving antennas NR
- the number of columns is equal to the number of transmitting antennas NT. That is, the channel matrix H is NRXNT matrix.
- the rank of a matrix is defined as the minimum number of rows or columns that are independent of each other. Thus, the tank of the matrix cannot be larger than the number of rows or columns.
- the tank ra (H) of the channel matrix H is limited as follows.
- 'Rank' represents the number of paths that can independently transmit a signal
- 'Number of layers' represents the number of signal streams transmitted through each path.
- a signal When transmitting a packet in a wireless communication system, a signal may be distorted in the transmission process because the transmitted packet is transmitted through a wireless channel. In order to receive the distorted signal right at the receiver, the distortion must be corrected in the received signal using channel information. In order to find out the channel information, a signal known to both the transmitting side and the receiving side is transmitted, and a method of finding the channel information with the degree of distortion when the signal is received through the channel is mainly used. The signal is referred to as a pilot signal (Pi lot signal) or a reference signal (Reference Signal).
- RSs can be classified into two types according to their purpose.
- One is an RS used for channel information acquisition, and the other is an RS used for data demodulation. Since the former is an RS for allowing the terminal to acquire downlink channel information, the former should be transmitted over a wide band, and a terminal that does not receive downlink data in a specific subframe should be able to receive and measure the corresponding RS.
- Such RS is also used for measurement such as handover.
- the latter is an RS that is transmitted together with the corresponding resource when the base station transmits a downlink, and the terminal can estimate the channel by receiving the corresponding RS, and thus can demodulate the data. This RS should be transmitted in the area where data is transmitted.
- CRS common reference signal
- DRS dedicated reference signal
- CRS is for obtaining information about channel status and measuring for handover It may be used and may be referred to as cell-specific RS.
- DRS is used for data demodulation and may be called UE-specific RS.
- DRS is used only for data demodulation, and CRS can be used for both purposes of channel information acquisition and data demodulation.
- the CRS is a cell-specific RS and is transmitted every subframe for a wideband.
- the CRS may be transmitted for up to four antenna ports according to the number of transmit antennas of the base station. For example, if the number of transmitting antennas of the base station is two, CRSs for antenna ports 0 and 1 are transmitted, and if four, CRSs for antenna ports 0 to 3 are transmitted.
- FIG. 6 shows the pattern of CRS and DRS on one resource block (12 subcarriers on 14 OFDM symbols X frequencies in time in case of a normal CP) in a system in which a base station supports four transmit antennas. It is a figure which shows.
- resource elements RE denoted by 'R0 1 ,' Rl ',' R2 1, and 'R3' indicate positions of CRSs with respect to antenna port indexes 0, 1, 2, and 3, respectively.
- the resource element denoted 'D' in FIG. 6 indicates the position of the DRS defined in the LTE system.
- RS for up to eight transmit antennas should also be supported. Since the downlink RS in the LTE system is defined only for up to four antenna ports, the RS for the antenna antenna ports is additionally defined when the base station has four or more up to eight downlink transmit antennas in the LTE-A system. Should be. As RS for up to eight transmit antenna ports, both RS for channel measurement and RS for data demodulation should be considered.
- Backward compatibility means that the existing LTE terminal supports to operate correctly in the LTE-A system. From the RS transmission point of view, if the RS for the maximum 8 transmit antenna ports is added to the time-frequency domain where CRS defined in the LTE standard is transmitted every subframe over the entire band, the RS overhead becomes excessively large. do. Therefore, in designing RS for up to 8 antenna ports, consideration should be given to reducing RS overhead. [108] RS newly introduced in LTE-A system can be classified into two types.
- RS which is RS for channel measurement purpose for selection of transmission rank, modulation ion and coding scheme (MCS), precoding matrix index (PMI), etc.
- MCS modulation ion and coding scheme
- PMI precoding matrix index
- Signal Choannel State Informat ion RS; CSI-RS
- DM RS demodulation-reference signal
- CSI-RS for channel measurement purposes is for the purpose of channel measurement, unlike CRS in the existing LTE system used for data demodulation at the same time as channel measurement, handover measurement, etc. There is a feature to be designed.
- the CSI-RS may also be used for the purpose of measuring handover. Since the CSI-RS is transmitted only for obtaining channel state information, unlike the CRS in the existing LTE system, the CSI-RS does not need to be transmitted every subframe. Thus, to reduce the overhead of the CSI-RS, the CSI-RS may be designed to be transmitted intermittently (eg, periodically) on the time axis.
- a DM RS is transmitted to a terminal scheduled for data transmission (dedi cated).
- the DM RS dedicated to a specific terminal may be designed to be transmitted only in a resource region scheduled for the terminal, that is, in a time-frequency region in which data for the terminal is transmitted.
- FIG. 7 is a diagram illustrating an example of a DM RS pattern defined in an LTE-A system.
- a position of a resource element in which a DM RS is transmitted on one resource block (12 subcarriers on 14 0FDM symbol X frequencies in time in case of a normal CP) in which downlink data is transmitted is shown.
- the DM RS may be transmitted for four antenna ports (antenna port indexes 7, 8, 9, and 10) which are additionally defined in the LTE-A system.
- DM RSs for different antenna ports can be distinguished by being located in different frequency resources (subcarriers) and / or different time resources (0 FDM symbols) (ie, can be multiplexed in FDM and / or TDM schemes). .
- DM RSs for different antenna ports located on the same time-frequency resource may be distinguished from each other by orthogonal codes (i.e., may be multiplexed by the CDM scheme).
- DM RSs for antenna ports 7 and 8 may be located in resource elements (REs) indicated as DM RS CDM group 1, and they may be multiplexed by an orthogonal code.
- DM RS group 2 in the example of FIG. In the resource elements denoted by DM RSs for antenna ports 9 and 10 may be located, they may be multiplexed by an orthogonal code.
- FIG. 8 is a diagram illustrating examples of a CSI-RS pattern defined in an LTE-A system.
- FIG. 8 shows the location of a resource element on which a CSI-RS is transmitted on one resource block in which downlink data is transmitted (12 subcarriers on 14 OFDM symbols X frequencies in time in the case of a general CP).
- one of the CSI-RS patterns of FIGS. 8 (a) to 8 (e) may be used.
- the CSI-RS may be transmitted for eight antenna ports (antenna port indexes 15, 16, 17, 18, 19, 20, 21, and 22) which are additionally defined in the LTE-A system.
- CSI-RSs for different antenna ports can be distinguished by being located in different frequency resources (subcarriers) and / or different time resources (OFDM symbols) (i.e., can be multiplexed in FDM and / or TDM schemes). .
- CSI-RSs for different antenna ports located on the same time-frequency resource may be distinguished from each other by orthogonal codes (ie, multiplexed by CDM).
- CDM orthogonal codes
- CSI-RSs for antenna ports 15 and 16 may be located in resource elements (REs) indicated as CSI-RS CDM group 1, and they may be multiplexed by an orthogonal code.
- REs resource elements
- CSI-RSs for antenna ports 17 and 18 may be located in resource elements indicated as CSI-RS CDM group 2, which may be multiplexed by an orthogonal code.
- CSI-RSs for antenna ports 19 and 20 may be located in resource elements indicated as CSI-RS CDM group 3, which may be multiplexed by an orthogonal code.
- CSI-RSs for antenna ports 21 and 22 may be located, and they may be multiplexed by an orthogonal code.
- FIGS. 6 to 8 are merely exemplary, and are not limited to specific RS patterns in applying various embodiments of the present invention. That is, even when RS patterns different from those of FIGS. 6 to 8 are defined and used, various embodiments of the present invention may be equally applied.
- one CSI-RS resource for signal measurement and one interference measurement for interference measurement may be defined by associating a resource (IMR).
- CSI information derived from different CSI processes is fed back to a network (eg, a base station) with independent periods and subframe offsets (subframe of fset).
- each CSI process has an independent CSI feedback setting.
- the CSI-RS resource, the IMR resource associat ion information, and the CSI feedback setting may be informed by the base station to the terminal through higher layer signaling such as RRC for each CSI process.
- RRC higher layer signaling
- the UE receives (sets) three CSI processes as shown in Table 1 below.
- CSI-RS 0 and CSI-RS 1 indicate CSI-RSs received from Cell 2, which is a neighboring cell participating in cooperation with CSI-RSs, which are each received from Cell 1, which is a serving cell of the UE. If it is assumed that the IMR set for each CSI process of Table 1 is set as shown in Table 2,
- cell 1 performs muting and cell 2 performs data transmission, and the terminal is configured to measure interference from other cells except cell 1 from IMR 0.
- cell 2 performs muting and cell 1 performs data transmission, and the UE is configured to measure interference from cells other than cell 2 from IMR 1.
- cell 1 in IMR 2 Both and cell 2 perform muting, and the terminal is configured to measure interference from cells other than cell 1 and cell 2 from IMR 2.
- CSI information of CSI process 0 represents optimal RI, PMI, and CQI information when data is received from cell 1.
- CSI information of CSI process 1 represents optimal RI, PMI, and CQI information when data is received from cell 2.
- CSI information of CSI process 2 represents optimal RI, PMI, and CQI information when data is received from cell 1 and no interference from cell 2 is received.
- a plurality of CSI processes configured (configured) for one UE share a mutually dependent value. For example, in the case of joint transit (JT) of cells 1 and 2, CSI process 1 and 2, which consider channel 1 of channel 1 as the signal part, are used as signal parts. If the considered CSI process 2 is configured (configured) for one UE, the tanks of the CSI process 1 and the CSI process 2 and the selected subband index should be the same to facilitate JT scheduling.
- JT joint transit
- the period or pattern in which the CSI-RS is transmitted may be configured by the base station (conf igurat ion).
- the UE In order to measure CSI-RS, the UE must know the CSI-RS configuration (conf igurat ion) for each CSI-RS antenna port of the cell to which it belongs.
- the CSI-RS configuration includes a downlink subframe index in which the CSI-RS is transmitted and a time-frequency position of the CSI-RS resource element (RE) in the transmission subframe (for example, FIGS. CSI-RS pattern as shown in e)), and CSI-RS sequence (a sequence used for CSI-RS purposes, according to a predetermined rule based on slot number, cell ID, CP length, etc.). May be generated).
- a plurality of CSI-RS configuration can be used in any (given) base station and the base station can inform the CSI-RS configuration to be used for the terminal (s) in the cell among the plurality of CSI-RS configuration .
- CSI-RSs for each antenna port may be multiplexed in an FDM, TDM and / or CDM scheme using orthogonal frequency resources or orthogonal time resources and / or orthogonal code resources. Can be.
- the base station informs UEs in a cell of information about the CSI-RS (CSI-RS configuration)
- the CSI-RS is mapped to a time-frequency to which the CSI-RS for each antenna port is mapped.
- the time information includes subframe numbers through which CSI-RSs are transmitted, periods during which CSI-RSs are transmitted, subframe offsets through which CSI-RSs are transmitted, and CSI-RS resource elements (RE) of a specific antenna.
- OFDM symbol numbers to be transmitted may be included.
- the information on the frequency may include a frequency spacing through which the CSI-RS resource element (RE) of a specific antenna is transmitted, an offset or shift value of the RE on the frequency axis, and the like.
- the CSI-RS may be periodically transmitted with an integer multiple of one subframe (eg, 5 subframe periods, 10 subframe periods, 20 subframe periods, 40 subframe periods, or 80 subframe periods). have.
- a transmission period of a CSI-RS of a base station is 10 ms (ie, 10 subframes) and a CSI-RS transmission offset (Of fset) is 3.
- the offset value may have a different value for each base station so that CSI-RS of several cells may be evenly distributed in time.
- the offset value may have one of 0 to 9.
- the offset value when the CSI-RS is transmitted in a period of 5 ms, the offset value may have one of 0 to 4, and when the CSI-RS is transmitted in a period of 20 ms, the offset value is one of 0 to 19.
- the offset value may have one of 0 to 39 when the CSI-RS is transmitted in a period of 40 ms.
- the offset value may be one of 0 to 79 when the CSI-RS is transmitted in a period of 80 ms. It can have a value of. This offset value indicates the value of the subframe where the base station transmitting the CSI-RS in a predetermined period starts the CSI-RS transmission.
- the terminal may receive the CSI-RS of the base station at the corresponding subframe location using the value.
- the terminal may measure the channel through the received CSI-RS, and as a result, may report information such as CQI, PMI, and / or RI (Rank Indicator) to the base station. Except where CQI, PMI and RI are distinguished from each other in this document, these may be collectively referred to as CQI (or CSI).
- CQI or CSI
- the CSI-RS transmission period and offset may be separately designated for each CSI-RS configuration (conf igurat ion).
- FIG. 10 is a diagram for explaining an example of a method in which a CSI-RS is transmitted aperiodically.
- one radio frame includes 10 subframes (subframe numbers 0 to 9).
- CSI-sub is transmitted. Frames can appear in a specific pattern.
- the CSI-RS transmission pattern may be configured in units of 10 subframes, and whether or not to transmit CSI-RS in each subframe may be designated as a 1-bit indicator.
- 10 illustrates a CSI-RS pattern transmitted at subframe indexes 3 and 4 within 10 subframes (subframe indexes 0 to 9). Such an indicator may be provided to the terminal through higher layer signaling.
- the configuration for CSI-RS transmission may be configured in various ways as described above.
- the base station may perform CSI-RS. It is necessary to inform the terminal of the setting. Embodiments of the present invention for informing the UE of the CSI-RS configuration will be described below.
- the following two methods may be considered as a method of informing the UE of CSI-RS configuration (conf igurat ion).
- the first method is a method in which a base station broadcasts information on CSI-RS configuration (conf igurat ion) to terminals by using dynamic broadcast channel (Dynami c Broadcast Channel (DBCH)) signaling.
- CSI-RS configuration conf igurat ion
- DBCH Dynamic Broadcast Channel
- system information when a base station informs UEs about system information, the information can be transmitted through BCH (Broadcasting Channe). If there is a lot of information about the system information to inform the terminal and cannot transmit all by BCH alone, the base station transmits the system information in the same manner as the general downlink data, but the PDCCH CRC of the corresponding data to a specific terminal identifier (for example,
- system information may be transmitted by masking using a system information identifier (SI-RNTI) instead of a C-RNTI. In this case, the actual system information is transmitted on the PDSCH region like general unicast data.
- SI-RNTI system information identifier
- DBCH Dynamic BCH
- PBCH Physical BCH
- SIB System Informat Ion Block
- SIB type 1 in existing LTE system Since information transmitted as SIB type 8 (SIBl to SIB8) is defined, a new SIB type can be defined for information on CSI-RS configuration, which is new system information not defined in the existing SIB type. .
- SIB9 or SIB10 may be defined, and the base station may inform the UEs in the cell of the CSI-RS configuration through the DBCH scheme.
- the second method is a method in which a base station informs each terminal of information on a CSI-RS configuration using Radio Resource Control (RRC) signaling. That is, information on CSI-RS configuration may be provided to each of terminals in a cell using dedicated R C signaling. For example, in the process of establishing a connection with the base station through initial access or handover, the base station informs the terminal of the CSI-RS configuration through RRC signaling. Can be. Alternatively, when the base station transmits an RRC signaling message for requesting channel state feedback based on the CSI-RS measurement, the base station may inform the terminal of the CSI-RS configuration through the corresponding R C signaling message.
- RRC Radio Resource Control
- a plurality of CSI-RS configurations may be used in any base station, and the base station may transmit the CSI-RS according to each CSI-RS configuration to the UE on a predetermined subframe.
- the base station informs the UE of a plurality of CSI-RS configurations, and among them, what is the CSI-RS to be used for channel state measurement for channel quality information (CQI) or channel state information (CSI) feedback? It may inform the terminal.
- CQI channel quality information
- CSI channel state information
- FIG. 11 is a diagram for explaining an example in which two CSI-RS configurations are used. 11 shows that one radio frame consists of 10 subframes (subframe numbers 0 to 9).
- the first CSI-RS configuration that is, the CSI-RS1 has a transmission period of 10 ms and a CSI-RS transmission offset of 3 in the CSI-RS1.
- the second CSI-RS configuration that is, the CSI-RS2 has a CSI-RS transmission period of 10 ms and a CSI-RS transmission offset of 4.
- FIG. Two base stations It provides information about CSI-RS configuration (conf igurat ion), and which CSI-RS configuration (conf igurat ion) can be used for CQI (or CSI) feedback.
- the UE When the UE receives a request for CQI feedback from a base station for a specific CSI-RS configuration (conf igurat ion), the UE performs channel state measurement using only the CSI-RS belonging to the corresponding CSI-RS configuration (conf igurat ion). can do. Specifically, the channel state is determined as a function of the CSI-RS reception quality, the amount of noise / interference, and the correlation coefficient. The CSI-RS reception quality measurement is performed using only the CSI-RS belonging to the corresponding CSI-RS configuration (conf igurat ion).
- the UE In order to measure the amount of noise / interference and the correlation coefficient (e.g., an interference covariance matrix indicating the direction of the interference, etc.) in the corresponding CSI-RS transmission subframe or specified subframes. Measurement can be performed. For example, in the embodiment of FIG. 11, when the UE receives a request for feedback from the base station from the first CSI-RS configuration (CSI-RS1), the UE receives a fourth subframe (subframe index 3 of one radio frame).
- the CSI-RS is used to measure reception quality, and it can be specified to use odd-numbered subframes separately to measure the amount of noise / interference and correlation coefficient.
- the CSI-RS reception quality measurement and the amount of noise / interference and correlation coefficient measurement may be specified to be limited to a specific single subframe (eg, subframe index 3).
- the received signal quality measured using the CSI-RS is a Signal-to-Interference plus Noise Rat io (SINR), which is simply S / I + N).
- SINR Signal-to-Interference plus Noise Rat io
- I the amount of interference
- N the amount of noise.
- S may be measured through the CSI-RS in the subframe including the CSI-RS in the subframe including the signal transmitted to the corresponding UE. Since I and N change according to the amount of interference from the neighboring cell, the direction of the signal from the neighboring cell, and the like, it can be measured through a CRS transmitted in a subframe for measuring S or a subframe separately designated.
- the measurement of the amount of noise / interference and the correlation coefficient may be performed at a resource element (RE) to which the CRS or CSI-RS is transmitted in the corresponding subframe, or the measurement of noise / interference may be performed. This may be done through a null resource element (Nul l RE) that is set to facilitate this.
- the UE In order to measure noise / interference in the CRS or CSI-RS RE, the UE first recovers the CRS or CSI—RS, and then subtracts the result from the received signal, leaving only the noise and interference signals. Statistics of noise / interference can be obtained.
- Nul l RE means that the base station is empty without transmitting any signal (ie RE (zero) means RE, and facilitates signal measurement from other base stations except the base station.
- CRS RE, CSI-RS RE, and Nul RE may all be used to measure the amount of noise / interference and the correlation coefficient, but the base station designates to the terminal as to which of these REs to measure the noise / interference. You can also This is because it is necessary to appropriately designate the RE to be measured by the corresponding UE according to whether the signal of the neighbor cell transmitted to the RE location where the UE performs measurement is a data signal or a control signal, and is transmitted from the corresponding RE location.
- the signal of the neighbor cell depends on whether the synchronization between the cells is correct and the CRS configuration (conf igurat ion) and the CSI-RS configuration (conf igurat i on). You can specify. That is, the base station may designate the terminal to measure noise / interference using all or part of CRS RE, CSI-RS RE, and Nul l RE.
- the base station may use a plurality of CSI-RS configuration (conf igurat ion), the base station informs the terminal of one or more CSI-RS configuration (conf igurat ion), and the CQI feedback from among The CSI-RS configuration to be used (conf igurat ion) and the Nul l RE location can be informed.
- the CSI-RS configuration (conf igurat i on) that the terminal will use for CQI feedback, in terms of distinguishing it from the Nul l RE transmitted with a zero transmit power, is expressed as a CSI transmitted with a non-zero transmit power. It's called the -RS configuration (conf igurat ion).
- the base station informs one CSI-RS configuration (conf igurat ion) for the terminal to perform channel measurement, and the terminal indicates that the CSI-RS is not 0 in the one CSI-RS configuration (conf igurat ion) ( It can be assumed to be transmitted at a non-zero transmit power.
- the base station informs about the CSI-RS configuration (conf igurat ion) transmitted at 0 transmit power (that is, about the Nul l RE location), and the terminal informs the corresponding CSI-RS configuration (conf igurat i on). Assume that the transmission power of 0 is relative to the location of the resource element (RE).
- the base station informs the terminal of one CSI-RS configuration (conf igurat ion) of non-zero transmission power, and if there is a CSI-RS configuration (conf igurat ion) of zero transmission power.
- the UE may inform the terminal of the corresponding Nul l RE position.
- the base station informs the terminal of a number of CSI-RS configuration (conf igurat ion), among which is used for the CQI feedback You can tell all or part of the CSI-RS configuration (conf igurat ion). Accordingly, we have been asked for CQI feedback for multiple CSI-RS configurations (conf igurat ion).
- the term 3 ⁇ 4 may measure the CQI using the CSI-RS corresponding to each CSI-RS configuration and transmit the measured CQI information to the base station together.
- the base station may configure uplink resources necessary for CQI transmission of the terminal to each CSI-RS configuration (conf) so that the terminal may transmit CQI for each of a plurality of CSI-RS configuration (conf igurat ion) to the base station.
- igurat ion can be specified in advance, and the information on the uplink resource designation can be provided to the UE in advance through RRC signaling.
- the base station may dynamically trigger the terminal to transmit the CQI for each of a plurality of CSI-RS configurations (conf igurat ion) to the base station. Dynamic triggering of CQI transmission may be performed through the PDCCH. Which CSI-RS configuration (conf igurat ion) to perform the CQI measurement may be known to the UE through the PDCCH. The terminal receiving the PDCCH may feed back the CQI measurement result for the CSI-RS configuration (conf igurat ion) specified in the corresponding PDCCH to the base station.
- a transmission time of a CSI-RS corresponding to each of a plurality of CSI-RS configurations may be designated to be transmitted in another subframe or may be specified to be transmitted in the same subframe. If transmission of CSI-RSs according to different CSI-RS configuration (conf igurat ion) is specified in the same subframe, it is necessary to distinguish them from each other. In order to distinguish CSI-RSs according to different CSI-RS configurations, one or more of time resources, frequency resources, and code resources of CSI-RS transmission may be applied differently.
- the transmission RE location of the CSI-RS is different for each CSI-RS configuration (for example, configu ion) (for example, the CSI-RS according to one CSI-RS configuration is shown in FIG. 8 (a)).
- the CSI-RS transmitted in the RE position and the CSI-RS according to the other CSI-RS configuration may be designated to be transmitted in the RE position of FIG.
- different CSI-RS scramble3 ⁇ 4 codes are used in different CSI-RS configurations (conf igurat ion). They can be distinguished from one another by using code resources.
- An LTE system may typically use carrier aggregator (CA) and higher layer MIM0 technology to improve performance.
- UEs supporting this system are CA and MIM0 SDMA (Spat i al) Division Multiple Access) can be supported, and can be divided into a UE having a high level capability and a UE having a low level capability according to the degree of support.
- a UE capability information element including various fields including a UE category may be used.
- a supported MIMO-capabicity field may be included in the UE capability information element.
- Support MIM0 capability field is space in downlink
- the UE capability information element may include a UE category field.
- the UE category field may define respective uplink and downlink capabilities for UEs in the 1-8 categories.
- the UE category field may include an uplink physical layer parameter value and a downlink physical layer parameter value for UEs of each category, respectively.
- UEs in the 6 to 8 categories may include radio parameter fields (rf-parameters) even if they do not support CACCarrier Aggregat ion.
- Carrier aggregation (CA) technology means that a plurality of carriers can be allocated to a terminal.
- a component carrier (CC) represents a carrier used in a carrier aggregation system and may be abbreviated as a carrier. For example, two 20 MHz CCs may be allocated to allocate a 40 MHz bandwidth.
- CAs can be broadly divided into inter-band CA and intra-band CA technology.
- An inter-band CA is a method of aggregating and using each CC existing in different bands
- an intra-band CA is a method of aggregating and using each CC in the same frequency band.
- Intra-band CAs are intra-band contiguous CAs and intra-bands, depending on whether the CC being the CA is contiguous.
- 3GPP LTE / LTE-A system defines uplink and downlink operating bands as shown in the following table.
- the F ULl0W means the highest frequency of the up-link sequence means the lowest frequency of the band and, FuL_high ⁇ UL band of operation.
- F DL ⁇ low means the lowest frequency of the downlink operating band, 11 ⁇ 2 ⁇ means the highest frequency of the downlink operating band.
- the frequency allocation organization of each country may allocate a specific frequency to the service provider according to the situation of each country.
- CA band class and the guard band to be described are shown in the table below.
- N RB ⁇ agg is the number of RBs aggregated in an aggregation channel band.
- the table below shows an example of a set of bandwidths that match the CA Conf igurat ion and corresponds to an intraband continuous CA.
- CA conf igurat ion represents an operating band and a CA bandwidth class.
- CA_1C means operating band 1 of Table 3 and CA band class C of Table 4
- the table below shows an example of a set of bandwidths that match the CA Conf igurat ion and corresponds to the interband CA.
- CA_1A-5A which is the first CA conf igurat i on in Table 6, CCs for operating band 1 of Table 3 and CA band class A of Table 4, and operating band 5 of Table 3 and CA of Table 4 Indicates that CCs for band class A are aggregated.
- cell A a cell controlled by TP A
- UEa a user who communicates with TP A
- cell B and UE b exist in neighboring TPBs. Since cell A and cell B use the same radio resource, the UEb receives interference from cell A as a user located at the cell boundary.
- cell A is referred to as an interfering cell
- TP A as an interfering TP
- cell B as a serving cell
- TP B as a serving TP
- UE b is referred to as a NAICS UE.
- the NAICS UE is defined as a UE capable of increasing data reception by removing an interference signal from an interference cell.
- IP interference parameters
- TM transmission mode
- CFI control format indicator
- MCS multimedia broadcast multicast service single frequency network
- the serving cell may receive the IP necessary for performing NAICS from the neighbor cell through a backhaul or the like.
- the NAICS UE receives the aforementioned IP through the serving TP or the interference TP or finds it through a blind detection (BD) to remove the interference signal.
- BD blind detection
- IP interference parameters
- the UE may use a method of BDing a value for IP only within a restricted set.
- a first embodiment of the present invention relates to a method in which a base station implicitly informs UE of interference TM information by using a UE capability reporting method and UE capability for interference TM.
- a NAICS UE it is desirable for a NAICS UE to be able to perform NAICS for all interference TM (transmission mode).
- the UE often has NAICS capability only for a specific interference TM or a specific interference TM set.
- a specific UE may perform NAICS by detecting an interference parameter (IP) as BD only for CRS based interference TM TM 2, 3, 4, 5, 6, and may not perform NAICS in the remaining interference TM. That is, the interference TM supported by this UE is TM2, 3, 4, 5, 6.
- another UE may perform NAICS only for TM 8, 9 and 10 which are DMRS based interference TM.
- a method of limiting a TM set used by an interfering cell and informing the UE of the set information may be used. For example, if the interfering cell uses only TM 2,3, this information is informed to the UE, and the UE can determine whether to perform NAICS by comparing its NAICS capability with the interfering TM. However, this method requires additional signaling to inform the interference TM.
- the UE without additional signaling of TM information of an interfering cell, the UE can be informed whether the TM of the interfering cell exists in a supported TM of the UE.
- TM the interfering cell
- embodiment 1-1 of the present invention relates to a method in which a UE transmits supported interference TM information, and a base station transmits network assistance information only to a UE to perform NAICS based on the information. It is about. That is, through this, the UE can easily know whether the interference cell TM is included in its supported interference TM.
- the first embodiment 1-1 will be described in detail.
- the UE when the supported interference TM for each UE is different, the UE preferably reports NAICS capability information including its supported interference TM information to the base station.
- the base station determines NAICS of a specific UE using the received support interference TM information of the UE, and transmits network assistance information only to a UE to perform NAICS to perform NAICS.
- the UE that has received the network assistance information can easily recognize that the TM of the interfering cell exists in the supported TM of the UE.
- UE1 and UE2 receiving strong interference from the interfering cell A in the serving cell
- UE1 and UE2 are supported interference TMs as TM2,3,4,5,6 and TM8, respectively. Assume that 9,10 is reported.
- the serving cell transmits network assistance information for the interfering base station A only to the UE1 so that only the UE1 can perform NAICS. That is, the network assistance information is not transmitted to UE2 so that UE2 does not perform NAICS.
- the UE when the UE does not receive the network assistance information, the UE does not perform the NAICS assuming that the TM of the interfering base station does not belong to its supported interference TM, and receives the network assistance information. Perform NAICS assuming that TM of interfering base station belongs to its supported interference TM.
- the UE of LTE release -8 may leave the cell and the UE of LTE release -11 may newly enter into the interfering cell A.
- the UE2 may receive network assistance information and perform NAICS.
- RRC signaling to UE1 indicating that network assistance information received by UE1 in the past is no longer valid.
- UE1 may not perform NAICS upon receiving such information.
- the validity period may be set in the transmitted (eg, R C signaling) network assistance information. If the network assistance information is not updated within the valid period, the UE may determine that the network assistance information received in the past is not valid.
- the UE may perform NAICS under the assumption that its TM and the interfering TM are always the same.
- the base station may set a specific frequency resource region to apply the same TM and perform UE scheduling according to the set value. In this case, the base station is limited in resource allocation, but the signaling overhead is reduced.
- BD performance of the IP may vary according to the interfering TM set.
- high accuracy BD is possible for TM set A, while BD accuracy may be poor for set B. Therefore, to improve BD accuracy Solution
- the resource allocation of the interfering PDSCH (RA, granularity) can be restricted differently.
- RA resource allocation of the interfering PDSCH
- Set A scheduling is possible in PRB units without particular limitation on RA of interfering cells.
- Set B can improve the performance of BD by limiting scheduling to RBG, PRG or subband.
- the UE reports supported supported interference TM information in a set unit, but this is only an example, and if there is only one supported interference TM, only one value may be reported. For example, if the UE can remove only the TM 4 interfering PDSCH, it reports only the TM 4 as supported interference TM information.
- the UE may report its supported interference TM and its des i red PDSCH TM in pairs (pai r).
- a UE may perform NAICS for TM 9 interference only when its desi red PDSCH TM satisfies a specific condition.
- the specific condition may be TM (TM 8, 9, 10) of the DMRS series.
- the UE may perform NAICS only when its TM and the interference TM to cancel are the same, or whether the two TMs may perform NAICS even when they are different (mixed TM). You can also report as
- the NAICS UE capability information (capabi 1 i ty) information may include not only supported interference TM but also the number of CRS ports of NAICS capable interference cells. For example, in consideration of the associative capability of the UE, a UE having low computational capability can perform NAICS only for the interference cell CRS ports 1 and 2, and a UE having high computational capability has 1, 2, or 4 CRS ports. We can report that all can perform NAICS.
- the UE may transmit a variable n about the number of CRS ports of the NAICS-capable interference cell in the UE capability information.
- the UE transmits a specific (supportedNAICS-2CRS-AP) field indicating that NAICS operation is possible for a CRS antenna port having a port number of 2 in the UE capability information, and if the specific field is included, the CRS of the interfering cell. It may be determined that the number of ports is two.
- the information about the TM of the neighbor cell is informed by impl icit by using the notification of the MBSFN subframing information about the neighbor cell to the NAICS UE (via higher layer signaling, etc.). Is about how. For example, in the subframe indicated by the MBSFN subframe, it is assumed that the interfering cell has transmitted the DM-RS based TM. In a subframe not indicated by the subframe, it may be assumed that an interfering cell has transmitted the CRS based TM.
- the 1-2 embodiment of the present invention will be described in detail.
- TMICS detection ion
- the CRS-based TM does not exist in the subframe set that allows the DM-RS-based TM, it is preferable not to transmit the CRS in the PDSCH region. This may be supported in the form of uni cast transmission based on MBSFN subframe introduced in LTE Release-9.
- the TM of the neighbor cell is divided into a CRS-based TM and a DM-RS-based TM, and different subframe sets are matched with the two types of TMs so that the information on the subframe set is simplified to impl i ci t. Interference TM information may be indicated.
- a NAICS UE receives MBSFN subframe information about a neighbor cell targeted for NAICS execution, it is assumed that a DM-RS based TM is transmitted in a MBSFB subframe of the neighbor cell, and a non-MBSFN subframe. Assumes that the CRS-based TM is transmitted.
- Embodiments 1-3 of the present invention relate to a method in which a base station informs a UE of interference TM information to an impl i cit using a Tr iggering subframe set.
- the serving cell receives Tr iggering subframe set information indicating that CRS-based TM or DM-RS-based TM is started in an adjacent cell (upper layer signaling). Etc.) to the NAICS UE.
- the base station transmits the period and offset of the Tr iggering subframe to the NAICS UE.
- the NAICS UE detects the DM-RS in the Tr iggering subframe and knows the TM of the interfering cell until the next period.
- FIG. 13 shows an example of a TM of a neighbor cell according to Tr iggering subframe set information.
- an adjacent cell operates a triggering subframe set with a constant period T.
- the DM-RS is detected at the kth time point, it indicates that the DM-RS based TM is performed during the section T corresponding to the kth time point.
- the CRS-based TM is assumed as the CRS-based TM during the corresponding section T.
- the NAICS UE performs DM-RS detection with the VCID of the neighbor cell at each time point of the specific subframe set, and if DM-RS is detected, assumes the interval of T as the DM-RS based TM. If not detected, T is assumed to be a CRS based TM.
- neighboring cells may perform DM-RS based scheduling in a corresponding subframe or perform DM-RS + duy y signal transmission. desirable.
- a scheduling constraint applied to an adjacent cell can be relaxed within a time unit of the section T.
- the Tr iggering subframe set may be set as an MBSFN subframe set.
- the CRS is not detected in the subframe set in which the DM-RS based TM is allowed, and this may be supported in the unicast form based on the MBSFN subframe. That is, the NAICS UE attempts DM-RS detection at each time point in the Triggering subframe set to determine the TM, and does not perform additional detection and NAICS operation for the CRS-based TM. This is because the accuracy of detection should be high because TM decision in Tr iggering subframe set determines later T period. Therefore, by limiting the CRS-based TM transmission in the Triggering subframe set, the interference amount can be mitigated to improve the DM-RS detection accuracy.
- a neighboring cell transmits a Duy y CSI-RS having a variable VCID, which is an initial value of a sequence, and is set to mean a different TM set for each VCID. Can be.
- the neighbor cell may transmit a Duy y CSI-RS in which the VCID, which is an initial value of the sequence, is changed, and set to mean a different TM set for each VCID.
- the Dummy CSI-RS cannot be used because the VCID is variable in terms of UEs served by the neighbor cell, and the neighbor Sill is configured to the corresponding dummy CSI-RS by the UEs.
- the seat must be set to ZP CSI—RS.
- the NAICS UE detects Duy y CSI-RS in the Tr iggering subframe set and grasps information of TMs supported during subsequent T intervals according to the detected VCID of the CSI-RS.
- the relation between the VCID and the TM set may be set differently for each frequency resource unit and inform the NAICS UE.
- the NAICS UE may detect the VCID of Duy CSI-RS for each frequency resource unit and grasp TM information on the corresponding frequency resource.
- NAICS can be supported per per band per bandcombinat ion or the maximum number of component carriers (X) that can support NAICS.
- X component carriers
- bandcombinat ion of it is possible to report whether the NAICS support and the maximum number of CCs that can be supported for each CC of the included bands 1A and 5A.
- the UE may independently report NAICS capability per per bandwidth per band per bandcombinat ion.
- NAICS may be supported per per bandwidth per band per bandcombinat ion or the maximum number of CCs that can support NAICS.
- the UE may report the NAICS capability independently for each CC capable of CA, and as a result, more flexible UE implementation is possible. For example, a UE with low processing power may report NAICS only for one of two CA-capable CCs, and a UE with high processing power may report that both CCs can perform NAICS operation.
- the NAICSsupported-rl2 field is added to the BandParameters-vl2 defined in the BandCombinationParameters-vl2, and as a result, the UE can report on / off the NAICS function for the corresponding band. That is, the NAICSsupported-rl2 field for each band may indicate whether the UE supports NAICS in the corresponding band.
- SupportedBandCombinat ion-vl2 :: SEQUENCE (SIZE (1..maxBandComb-rlO)) OF
- bandParameterList-rl2 SEQUENCE (SIZE (1..maxSimultaneousBands-rlO)) OF
- the NAICS-capability-rl2 is a field indicating the NAICS capability of the UE and may indicate a NAICS receiver type, a supported interference TM, and the number of supported interference CRS ports.
- the NAICS receiver type may indicate a type such as SLIC, R-ML, ML, or Enhanced ⁇ SE IRC receiver.
- the supported interference TM means TM information of an interference signal capable of performing NAICS by the UE.
- NAICS-capability-rl2 If the NAICS-capability-rl2 is not reported, it indicates that the NAICS function is turned off for the corresponding band.
- the UE may report the maximum number of CCs supporting the NAICS function in a specific band on a per band per band combination basis.
- RRC signaling could be defined as shown in Table 9 below. That is, the NAICSsupported-rl2 field for each band indicates the maximum number of CCs that the UE can support in the band.
- NAICSsupported-rl2 ENUMERATED ⁇ n0, nl, n2, n3, ... ⁇
- ⁇ In the case of using the signaling shown in Table 9 above, more sophisticated NAICS capability may be reported for the CC configuring the cont iguous intra band CA. For example, when performing contiguous intra band CA using bandwidth cl ass C in band 1, it is possible to support NAICS for only one CC of two CCs configuring band 1. That is, when the UE reports and sets NAICSsupported_rl2 defined above for band 1C to 1, it informs the base station that NAICS is supported only for one of two CCs of band 1.
- the independent NAICS capability of each CC should be reported.
- the independent NAICS capability should be reported.
- Table 10 shows the results of Table 7 and reports whether NAICS is supported by per bandwidth per band per bandcombinat ion.
- Table 11 below is shown in Table 8, and when the NAICS function is on per bandwidth per band per bandcombinat i on, it can report the specific NAICS capabilities together. [242] [Table 11]
- BandParametersDL-vl2 -SEQUENCE (SIZE (1..maxBandwidthClass-rl2)) OF CA-NAI CS-Par ame t e r sDL-r 12
- Table 12 shows the maximum number of CCs supporting the NAICS function per per bandwidth per band per bandcombinat ion.
- CA-NAICS-ParametersDL-r 12 :: SEQUENCE ⁇
- NAICSsupported-rl2 ENUMERATED ⁇ nO, nl, n2, n3, ... ⁇
- the feature of reporting NAICS capability for each per band per band combination of Tables 7 to 9 may be applied to reporting NAICS capability for each higher per band combination.
- parameters reporting NAICS capability in Tables 7 to 9 may be included in the BandCombi nation parameter.
- MIM0 capacities can be defined depending on whether NAICS is performed.
- the UE uses a part of the total spatial resources that can be obtained by the number of its reception antennas to receive the interference signal. As a result, only some of the total spatial resources are used to receive the desired data. That is, MIM0 capability depends on the maximum number of layers through which the desired data is spatial multiplexed.
- a NAICS UE having four receive antennas may report two MIM0 capacities that indicate whether NAICS is performed. That is, the UE has NAICS function on
- the maximum 2 layer SDM (Spatial Division Mult iplexing) can be reported as MIMO capability, and the maximum 4 layer SDM can be reported as MIMO capability when the NAICS function is of f.
- the NAICS UE may simply report the number of CCs that can be NAICS in a manner different from the examples of Tables 7 to 9 that report whether NAICS is available or the number of CCs that can be NAICS in units of per band per bandcombi nat ion. I will.
- the base station transmits a network assistance signal required for each of the N CCs to the UE.
- the UE transmits NAICS to any CC. Indicates not performing
- NAICSsupported-rl2 indicates the maximum number of CCs that a NAICS UE can support.
- NAICSsuppor ted-r l2 ENUMERATED ⁇ n0, nl, n2, n3, ... ⁇
- a CA capable UE receives DL service for one CC without performing an actual CA, it may be able to perform NAICS using the extra processing power accordingly.
- a CA capable UE for 5 CCs actually performs CA for 4 or less (X for X, the UE has more extra processing power as the number of CCs used decreases.
- the extra processing power can be used to perform NAICS for more CCs, for example, if 4 CCs are CA, perform NAICS for 1 CC, and if 2 CCs are CA, It is possible to perform NAICS for many two CCs.In consideration of this, it is preferable to report the maximum number of NAICSs (X counts) for each CC count that actually performs CA for effective NAICS capability reporting.
- the maximum number of CCs that can be NAICS when performing CA and NAICS availability when not performing CA may be independently reported.
- the UE may report to the base station whether to apply NAICS for the maximum number of layers per per band combinat ion.
- the number of layers means the sum of the number of layers of desi red PDSCH and the number of interference PDSCH layers to be removed. For example, when the maximum number of layers is 3, if the desired PDSCH is 1 layer, the interference PDSCH may be canceled up to 2 layers. If the desired PDSCH is 2 layers, the interference PDSCH may be canceled up to 1 layer.
- RRC signaling shown in Table 14 may be used.
- NAICSsupported-rl2 indicates how many layers the NAICS UE will apply NAICS to in a corresponding band.
- NAICSsupported-r l2 ENUMERATED ⁇ nl, n2, n3, ... ⁇
- the UE may report to the base station whether to apply NAICS to the maximum number of layers per per bandwidth per band per band combinat ion.
- RRC signaling such as Table 15 may be used.
- CA-NAICS-ParametersDL-rl2 :: SEQUENCE ⁇
- NAICSsupported-rl2 ENUMERATED ⁇ nl, n2, n3, ... ⁇
- the number of layers to which NAICS is applied means the sum of the number of desired PDSCH layers and the number of interference PDSCH layers to be canceled.
- the number of layers may be defined as the maximum number of interpolated PDSCH layers to be canceled. In this case, 0 may be included as an ENUMERATED value of NAICSsupported-rl2 in Tables 14 and 15.
- the layer number reporting method has been reported for each per band per band combinat ion or per bandwidth per band per band comb inat ion, but may be more accurately reported per per CC.
- the UE indicates indicat ion through a 1-bit indicator, and if the CA is applied, the UE and the base station indicate the 1-bit indicator as follows. Can be interpreted
- the UE may apply NAICS for at least one CC.
- the base station does not know how many CCs the UE will actually perform NAICS, and the base station signals the NAICS information for all CCs in case all CCs perform NAICS. How many CCs to perform NAICS is finally determined by the UE, and performs the NAICS using the NAICS information of the CC. If the NAICS capability indicator is 0, the UE cannot apply NAICS for all CCs.
- NAICS capability indicator can be interpreted as follows.
- the UE may apply NAICS for at least one CC.
- the base station does not know how many CCs the UE will actually perform NAICS, and the base station selects some CC to apply NAICS, and then signals the NAICS information to the CC Null. How many CCs to perform NAICS is finally determined by the UE, and performs the NAICS using the NAICS information of the CC. If the NAICS capability indicator is 0, the UE cannot apply NAICS for all CCs.
- the 1 bit indicator may be defined as shown in Table 16 as NAICSsupported-rl2.
- NAICS-Capability-vl2 SEQUENCE ⁇
- the UE indicates NAICS capability through a 1-bit indicator for each Bandcombi nation, and when the CA is applied, the UE and the base station may interpret the 1-bit indicator as follows.
- the UE may apply NAICS to at least one CC constituting the corresponding bandcombi nation.
- the base station does not know how many CCs the UE will actually perform NAICS, and the base station is NAICS for all CC constituting the bandcombi nation in case all the CC constituting the bandcombi nation performs NAICS Signal information.
- the UE decides how many CCs to perform in the bandcombi nation and uses the NAICS information of the CC. Perform NAICS. If the NAICS capability indicator is 0, the UE cannot apply NAICS to all CCs constituting the corresponding bandcombi nation.
- the 1-bit indicator may be interpreted as follows.
- the UE may apply NAICS to at least one CC constituting the corresponding bandcombi nat ion.
- the base station is not known to the UE that the UE actually performs NAICS for some CCs, the base station selects some CC to apply NAICS of all the CC constituting the bandcombi nation to signal NAICS information.
- the UE finally determines how many CCs will be performed in the bandcombi nation and performs NAICS using the NAICS information of the CC. If the NAICS capability indicator is 0, the UE cannot apply NAICS to all CCs constituting the corresponding bandcombi nation.
- the 1 bit indicator is NAICSsupported—rl2 and may be defined as shown in Table 17 below. '
- fdd-Add-UE-EUTRA Capabilities— vl2 UE-EUTRA-Capab i 1 ityAddXDD-Mode-vl2 OPTIONAL, t dd-Add-UE-EUTRA-Capab iities-vl2 UE-EUTRA-Capab i 1 ityAddXDD-Mode- vl2 OPTIONAL, nonCriticalExtension SEQUENCE ⁇ OPTIONAL
- bandParameterList-rl2 SEQUENCE (SIZE (1..maxSimultaneousBands-rlO)) OF
- the UE indicates whether NAICS is enabled through a 1-bit indicator, and when CA is applied, the UE and the base station interpret that NAICS is not possible regardless of the 1-bit indicator.
- the UE reports whether the NAICS is possible for the total amount of bandwidth (BW) together with the NAICS availability. That is, you can report NAICS-capable aggregated B.
- BW bandwidth
- the base station configures a CC so that the sum of BWs is 20 MHz or less, and informs the UE of the NAICS information corresponding to the CC.
- NAICS-capable BW may be reported in units of PRBs.
- the total NAW possible BW may be reported in units of per bandcombinat ion, per band per Bandcombinat ion, or per bandwidth per band per Bandcombinat ion.
- NAICS total BW may be reported as the maximum number of NAICS possible CCs.
- UE capability is reported as a supportedNAICS field consisting of an 8-bit bitmap, and each bit of supportedNAICS may represent a combination of a total number of NAICS-capable BWs and a maximum number of NAICS-capable CCs.
- the first bit of supportedNAICS may represent a combination of NAICS capable BW of 50PRB and 5 maximum CCs capable of NAICS, and when the first bit is 1, it may indicate that there is corresponding NAICD capability.
- FIG. 14 is a flowchart illustrating an example of an embodiment of the present invention.
- a UE first transmits UE capability information on NAICS capabilities supported by a UE (S141).
- the UE capability information transmitted by the UE may include various parameters described in the first or second embodiment of the present invention. Since the parameters included in the UE capability information have been described in detail in the first embodiment or the second embodiment, description thereof is omitted.
- the UE receives a signal from the base station based on the UE capability information.
- the UE may receive a signal by using the received network assistance information for transmission of UE capability information.
- FIG. 15 illustrates a base station and a terminal that can be applied to an embodiment of the present invention.
- a relay When a relay is included in the wireless communication system, communication is performed between the base station and the relay in the backhaul link, and communication is performed between the relay and the terminal in the access link. Therefore, the base station or the terminal illustrated in the figure may be replaced with a relay according to the situation.
- a wireless communication system includes a base station 1510 and a terminal 1520.
- Base station 1510 includes a processor 1513, a memory 1514, and a Radio Frequency (RF) unit 1511, 1512.
- the processor 1513 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 1514 is connected with the processor 1513 and stores various information related to the operation of the processor 1513.
- the RF unit 1516 is connected with the processor 1513 and transmits and / or receives a radio signal.
- Terminal 1520 includes a processor 1523, a memory 1524, and RF units 1521, 1522.
- Processor 1523 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 1524 is connected with the processor 1523 and stores various information related to the operation of the processor 1523.
- the RF units 1521 and 1522 are connected to the processor 1523 and transmit and / or receive radio signals.
- the base station 1510 and / or the terminal 1520 may have a single antenna or multiple antennas.
- a specific operation described as performed by a base station may be performed by an upper node in some cases. That is, a plurality of four including the base station Obviously, various operations performed for communication with a terminal in a network composed of network nodes may be performed by a base station or other network nodes other than the base station.
- a base station may be replaced by terms such as a fixed station, a Node B, an eNodeB (eNB), an access point, and the like.
- an embodiment of the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more ASICs pplication specific integrated circuits (DSPs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs ( field programmable gate arrays), processors, controllers, microcontroller microprocessors, and the like.
- DSPs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- an embodiment of the present invention may be implemented in the form of a model procedure, a function, etc. that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
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Priority Applications (6)
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AU2015259977A AU2015259977B2 (en) | 2014-05-16 | 2015-05-18 | Method and apparatus for cancelling interference and receiving signal in wireless communication system |
EP15793209.6A EP3145101A4 (en) | 2014-05-16 | 2015-05-18 | Method and apparatus for cancelling interference and receiving signal in wireless communication system |
KR1020167025711A KR102318546B1 (ko) | 2014-05-16 | 2015-05-18 | 무선 통신 시스템에서 간섭을 제거하고 신호를 수신하는 방법 및 장치 |
JP2017502557A JP6336699B2 (ja) | 2014-05-16 | 2015-05-18 | 無線通信システムにおいて干渉を除去し信号を受信する方法及び装置 |
US15/129,383 US9882590B2 (en) | 2014-05-16 | 2015-05-18 | Method and apparatus for cancelling interference and receiving signal in wireless communication system |
CN201580025320.5A CN106464407B (zh) | 2014-05-16 | 2015-05-18 | 在无线通信系统中抵消干扰并且接收信号的方法和设备 |
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KR20170007728A (ko) * | 2014-05-16 | 2017-01-20 | 엘지전자 주식회사 | 무선 통신 시스템에서 간섭을 제거하고 신호를 수신하는 방법 및 장치 |
CN105450565B (zh) * | 2014-09-26 | 2019-05-14 | 中国移动通信集团公司 | 网络辅助式干扰删除与抑制及其控制方法、装置 |
EP3739999A4 (en) * | 2018-01-12 | 2021-11-10 | Ntt Docomo, Inc. | USER EQUIPMENT |
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EP3145101A1 (en) | 2017-03-22 |
US9882590B2 (en) | 2018-01-30 |
CN106464407A (zh) | 2017-02-22 |
JP6336699B2 (ja) | 2018-06-06 |
EP3145101A4 (en) | 2017-11-29 |
CN106464407B (zh) | 2018-12-28 |
AU2015259977A1 (en) | 2016-10-27 |
AU2015259977B2 (en) | 2017-09-28 |
KR20170007729A (ko) | 2017-01-20 |
KR102318546B1 (ko) | 2021-10-28 |
US20170179985A1 (en) | 2017-06-22 |
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