WO2014069929A1 - 간섭 제거 수신 방법 및 단말 - Google Patents
간섭 제거 수신 방법 및 단말 Download PDFInfo
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- WO2014069929A1 WO2014069929A1 PCT/KR2013/009823 KR2013009823W WO2014069929A1 WO 2014069929 A1 WO2014069929 A1 WO 2014069929A1 KR 2013009823 W KR2013009823 W KR 2013009823W WO 2014069929 A1 WO2014069929 A1 WO 2014069929A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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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
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
- H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
- H04J11/004—Interference mitigation or co-ordination of multi-user interference at the receiver using regenerative subtractive interference cancellation
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03592—Adaptation methods
- H04L2025/03598—Algorithms
- H04L2025/03605—Block algorithms
Definitions
- the present disclosure relates to an interference cancellation reception method and a terminal.
- 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
- OFDM converts serially input data into N parallel data and transmits the data on N orthogonal subcarriers. Subcarriers maintain orthogonality in the frequency dimension.
- OFDMA refers to a multiple access method for realizing multiple access by independently providing each user with a part of subcarriers available in a system using OFDM as a modulation scheme.
- LTE-A 3GPP LTE-Advanced
- the interference can be further increased by such a small cell, therefore, the interference cancellation function is urgently needed.
- interference estimation support information may be received from a serving cell.
- the interference estimation support information includes information for a time domain and information for a frequency domain, and the information for the time domain includes a section of a radio frame or subframe in a time domain in which coherence of an interference signal is maintained.
- the information for the frequency domain may indicate a section in the frequency domain where coherence of the interference signal is maintained.
- an interference signal flowing from a neighbor cell is estimated using information for a time domain and information for a frequency domain in the interference estimation support information, and the serving cell is removed by removing the estimated interference. The signal from can be detected.
- the terminal includes a radio receiver and an interference estimator that controls the radio receiver and estimates an interference signal introduced from a neighbor cell using interference estimation support information received from a serving cell.
- the interference estimation support information includes information for a time domain and information for a frequency domain, and the information for the time domain includes a section of a radio frame or subframe in a time domain in which coherence of an interference signal is maintained.
- the information for the frequency domain may indicate a section in the frequency domain in which coherence of the interference signal is maintained.
- the terminal may include an interference cancellation unit for detecting a signal from the serving cell by removing the estimated interference signal.
- the interference estimation support information may be generated by information obtained by the serving cell from the neighbor cell.
- the information for the time domain may be represented by an integer multiple of 10 ms, which is the length of the radio frame.
- the interval in the frequency domain indicated by the information for the frequency domain may be represented by the number of resource blocks (RBs).
- RBs resource blocks
- the number of RBs indicated by the information for the frequency domain may be any one of 1,2,4,8.
- the information for the frequency domain may be represented by 2 bits. 1 when the value of the 2 bits is '00', 2 when the value of the 2 bits is '01', 4 when the value of the 2 bits is '10', and 2 If the bit value is '11', 8 can be indicated.
- the interference estimation support information may be received through a broadcast channel or received through an RRC signal.
- the reception performance can be further improved through the interference cancellation function.
- 1 is a wireless communication system.
- FIG. 2 is an antenna configuration diagram of a multi-antenna system.
- 3 shows a structure of a radio frame according to FDD in 3GPP LTE.
- FIG. 4 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
- 5 shows a structure of a downlink subframe.
- FIG. 6 shows a structure of an uplink subframe in 3GPP LTE.
- FIG. 7 is a comparative example of a conventional single carrier system and a carrier aggregation system.
- FIG. 8 illustrates a heterogeneous network including a macro cell and a small cell.
- FIG. 9 is a block diagram illustrating a structure of a UE according to one disclosure of the present specification.
- FIG. 10 is a block diagram illustrating the operation of the interference canceling unit illustrated in FIG. 9 in a block form.
- 11A and 11B are flowcharts illustrating a method according to the first embodiment presented herein.
- FIG. 12 is a flowchart illustrating a method according to a second embodiment of the present disclosure.
- FIG. 13 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- the UE includes a terminal, a mobile equipment (ME), a mobile station (MS), a user terminal (UT), a subscriber station (SS), and a wireless device (wireless). It may be called a Device, a Handheld Device, or an Access Terminal (AT).
- the terminal may be a portable device having a communication function such as a mobile phone, a PDA, a smart phone, a wireless modem, a laptop, or the like, or a non-portable device such as a PC or a vehicle-mounted device. .
- base station refers to a fixed station (fixed station) to communicate with the wireless device, in other terms such as eNB (evolved-NodeB), BTS (Base Transceiver System), Access Point (Access Point) Can be called.
- eNB evolved-NodeB
- BTS Base Transceiver System
- Access Point Access Point
- LTE includes LTE and / or LTE-A.
- 1 is a wireless communication system.
- a wireless communication system includes at least one base station (BS) 20.
- Each base station 20 provides a communication service for a particular geographic area (generally called a cell) 20a, 20b, 20c.
- the cell can in turn be divided into a number of regions (called sectors).
- the UE 10 may be fixed or mobile, and may include a terminal, a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), and a wireless device (UE). It may be called other terms such as a wireless device, a personal digital assistant, a wireless modem, a handheld device, and the like.
- the base station 20 generally refers to a fixed station for communicating with the terminal 10 and may be referred to by other terms such as an evolved-NodeB (eNodeB), a base transceiver system (BTS), and an access point. have.
- eNodeB evolved-NodeB
- BTS base transceiver system
- the UE typically belongs to one cell, and the cell to which the UE 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 20 to the UE 10
- uplink means communication from the UE 10 to the base station 20.
- the transmitter may be part of the base station 20 and the receiver may be part of the UE 10.
- the transmitter may be part of the UE 10 and the receiver may be part of the base station 20.
- the wireless communication system includes 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 is an antenna configuration diagram of a multi-antenna system.
- the theoretical channel transmission capacity is proportional to the number of antennas, unlike when only a plurality of antennas are used in a transmitter or a receiver As a result, the transmission rate (or transmission rate) can be improved, and the frequency efficiency can be significantly improved.
- the transmission rate according to the increase in the channel transmission capacity may theoretically increase as the maximum rate R1 is multiplied by the following rate increase rate Ri when one antenna is used. That is, for example, in a MIMO communication system using four transmit antennas and four receive antennas, a transmission rate four times higher than a single antenna system may be theoretically obtained.
- the research trends related to multi-antennas to date include information theory aspects related to calculation of multi-antenna communication capacity in various channel environments and multi-access environments, wireless channel measurement and model derivation of multi-antenna systems, and transmission reliability and transmission rate Active research is being conducted from various viewpoints, such as the study of space-time signal processing technology.
- a reception signal input to each reception antenna may be expressed as follows.
- the channel between each transmit / receive antenna can be distinguished according to the transmit / receive antenna index, and the channel passing from the transmit antenna j to the receive antenna i is represented by h ij .
- the transmission signal x may be expressed as Equation 3.
- W ij of the precoding matrix W denotes a weight between the i th transmission antenna and the j th information, wherein the transmission power of each transmitted signal is P 1 , P 2 , ... P NT , Transmission information whose transmission power is adjusted may be represented by a diagonal matrix P as follows.
- a wireless communication system can be largely divided into a frequency division duplex (FDD) method and a time division duplex (TDD) method.
- 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.
- 3 shows a structure of a radio frame according to FDD in 3GPP LTE.
- a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered from 0 to 19 slots.
- 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.
- one radio frame may have a length of 10 ms
- one subframe may have a length of 1 ms
- one slot may have a length of 0.5 ms.
- the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
- FIG. 4 is an exemplary diagram illustrating a resource grid for one uplink or downlink slot in 3GPP LTE.
- an uplink slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and includes N UL resource blocks (RBs) in a frequency domain. do.
- the OFDM symbol is for representing one symbol period, and may be referred to as an SC-FDMA symbol, an OFDMA symbol, or a symbol period according to a system.
- the RB includes a plurality of subcarriers in the frequency domain in resource allocation units.
- the number N UL of resource blocks included in an uplink slot depends on an uplink transmission bandwidth set in a cell. Each element on the resource grid is called a resource element.
- 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 subcarriers and the OFDM symbols in the resource block is equal to this. It is not limited. The number of OFDM symbols or the number of subcarriers included in the resource block may be variously changed. The number of OFDM symbols may change depending on the length of a cyclic prefix (CP). 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.
- CP cyclic prefix
- a resource grid for one uplink slot may be applied to a resource grid for a downlink slot.
- 5 shows a structure of a downlink subframe.
- E-UTRA Evolved Universal Terrestrial Radio Access
- Physical Channels and Modulation Release 10
- the radio frame includes 10 subframes indexed from 0 to 9.
- One subframe includes two consecutive slots.
- the radio frame includes 20 slots.
- the time it takes for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
- One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain.
- OFDM symbol is only for representing one symbol period in the time domain, since 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink (DL), multiple access scheme or name There is no limit on.
- OFDM symbol may be called another name such as a single carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, and the like.
- SC-FDMA single carrier-frequency division multiple access
- One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP).
- CP cyclic prefix
- a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 12 resource elements (REs). can do.
- the DL (downlink) subframe is divided into a control region and a data region in the time domain.
- the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
- a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
- PDCH physical downlink control channel
- a physical channel in 3GPP LTE is a physical downlink shared channel (PDSCH), a physical downlink shared channel (PUSCH), a physical downlink control channel (PDCCH), and a physical channel (PCFICH). It may be divided into a Control Format Indicator Channel (PHICH), a Physical Hybrid-ARQ Indicator Channel (PHICH), and a Physical Uplink Control Channel (PUCCH).
- PDSCH physical downlink shared channel
- PUSCH physical downlink shared channel
- PDCCH physical downlink control channel
- PCFICH physical channel
- It may be divided into a Control Format Indicator Channel (PHICH), a Physical Hybrid-ARQ Indicator Channel (PHICH), and a Physical Uplink Control Channel (PUCCH).
- PHICH Control Format Indicator Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- PUCCH Physical Uplink Control Channel
- the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
- CFI control format indicator
- the wireless device first receives the CFI on the PCFICH and then monitors the PDCCH.
- the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.
- the PHICH carries a positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal for a UL hybrid automatic repeat request (HARQ).
- ACK positive-acknowledgement
- NACK negative-acknowledgement
- HARQ UL hybrid automatic repeat request
- the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame.
- the PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
- MIB master information block
- SIB system information block
- DCI downlink control information
- PDSCH also called DL grant
- PUSCH resource allocation also called UL grant
- VoIP Voice over Internet Protocol
- blind decoding is used to detect the PDCCH.
- Blind decoding is a method of demasking a desired identifier in a cyclic redundancy check (CRC) of a received PDCCH (referred to as a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
- the base station determines the PDCCH format according to the DCI to be sent to the wireless device, attaches the CRC to the DCI, and masks a unique identifier (referred to as Radio Network Temporary Identifier (RNTI)) to the CRC according to the owner or purpose of the PDCCH.
- RNTI Radio Network Temporary Identifier
- the uplink channel includes a PUSCH, a PUCCH, a sounding reference signal (SRS), and a physical random access channel (PRACH).
- PUSCH PUSCH
- PUCCH Physical Uplink Control Channel
- SRS sounding reference signal
- PRACH physical random access channel
- FIG. 6 shows a structure of an uplink subframe in 3GPP LTE.
- an uplink subframe may be divided into a control region and a data region in the frequency domain.
- a physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region.
- the data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted).
- PUSCH Physical Uplink 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 in each of a first slot and a second slot.
- the frequency occupied by RBs belonging to the RB 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.
- FIG. 7 is a comparative example of a conventional single carrier system and a carrier aggregation system.
- a general FDD wireless communication system supports only one carrier for uplink and downlink to a user equipment.
- the bandwidth of the carrier may vary, but one carrier is assigned to the terminal.
- a general FDD wireless communication system performs data transmission and reception through one downlink band and one uplink band corresponding thereto.
- the base station and the terminal transmit and receive data and / or control information scheduled in subframe units. Data is transmitted and received through the data area set in the uplink / downlink subframe, and control information is transmitted and received through the control area set in the uplink / downlink subframe.
- the uplink / downlink subframe carries signals through various physical channels.
- 5 illustrates the FDD scheme for the sake of convenience, the above description may be applied to the TDD scheme by dividing the radio frame into uplink / downlink in the time domain.
- Such a single carrier system may correspond to an example of communication in an LTE system.
- the 3GPP LTE system supports up to 20MHz, although the uplink bandwidth and the downlink bandwidth may be different.
- CA Carrier aggregation
- a carrier aggregation (CA) system refers to a system in which one or more carriers having a bandwidth smaller than a target broadband is configured to configure the broadband when the wireless communication system attempts to support the broadband.
- CA carrier aggregation
- LTE-A LTE-Advanced
- CA carrier aggregation
- the carrier aggregation (CA) system may be referred to by other names such as a multiple carrier system, a bandwidth aggregation system, and the like.
- a terminal may simultaneously transmit or receive one or a plurality of carriers according to capacity. That is, in a carrier aggregation (CA) system, a plurality of component carriers (CCs) may be allocated to a terminal.
- the component carrier used in the present specification means a carrier used in a carrier aggregation system and may be abbreviated as a carrier.
- a component carrier may refer to a frequency block or a center carrier of a frequency block for carrier aggregation according to a context, and these may be mixed with each other.
- FIG. 7B may correspond to an example of communication in the LTE-A system.
- the UE may support a bandwidth of 60 MHz. Or, for example, if five CCs are allocated as granularity in a carrier unit having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.
- FIG. 5B illustrates a case where the bandwidth of the uplink component carrier and the bandwidth of the downlink component carrier are the same for convenience. However, the bandwidth of each component carrier can be determined independently.
- the target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
- 3GPP LTE systems can support bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz.
- the bandwidth of the uplink component carrier may be configured as 5 MHz (UL CC0) + 20 MHz (UL CC1) + 20 MHz (UL CC2) + 20 MHz (UL CC3) + 5 MHz (UL CC4).
- the bandwidth may be configured by defining a new bandwidth without using the bandwidth of the existing system as it is.
- FIG. 7B illustrates a case where the number of uplink component carriers and the number of downlink component carriers are symmetrical for convenience. As described above, the case where the number of downlink component carriers and the number of downlink component carriers are the same is called symmetric aggregation, and the case where the number is different is called asymmetric aggregation.
- Asymmetric carrier aggregation may occur due to the limitation of available frequency bands or may be artificially established by network configuration. For example, even if the entire system band is composed of N CCs, a frequency band that a specific UE can receive may be limited to M ( ⁇ N) CCs.
- Various parameters for carrier aggregation may be set in a cell-specific, UE group-specific, or UE-specific manner.
- a carrier aggregation (CA) system may be classified into a continuous carrier aggregation system in which each carrier is continuous and a non-contiguous carrier aggregation system in which each carrier is separated from each other.
- a guard band may exist between each carrier.
- a multi-carrier system or a carrier aggregation system it should be understood to include both the case where the component carrier is continuous and the case where it is discontinuous.
- a cell may mean a pair of downlink frequency resources and uplink frequency resources.
- the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource.
- one DL CC or a pair of UL CCs and DL CCs may correspond to one cell.
- one cell basically includes one DL CC and optionally includes a UL CC.
- a terminal communicating with a base station through a plurality of DL CCs receives a service from a plurality of serving cells.
- the downlink is composed of a plurality of DL CCs, but only one CC may be used for the uplink.
- the terminal may be said to be provided with a service from a plurality of serving cells for the downlink, and the terminal may be said to be provided with a service from only one serving cell for the uplink.
- the terminal in order to transmit and receive packet data through a cell, the terminal must first complete configuration for a specific cell.
- the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed.
- the configuration may include a general process of receiving common physical layer parameters required for data transmission and reception, media access control (MAC) layer parameters, or parameters required for a specific operation in the RRC layer.
- MAC media access control
- the cell in the configuration complete state may exist in an activation or deactivation state.
- activation means that data is transmitted or received or is in a ready state.
- the UE may monitor or receive a control channel (PDCCH) and a data channel (PDSCH) of an activated cell in order to identify resources (which may be frequency, time, etc.) allocated thereto.
- PDCCH control channel
- PDSCH data channel
- the terminal may receive system information (SI) required for packet reception from the deactivated cell.
- SI system information
- the terminal does not monitor or receive the control channel (PDCCH) and data channel (PDSCH) of the deactivated cell in order to check the resources (may be frequency, time, etc.) allocated to them.
- the activation / deactivation of the component carrier can be identified with the concept of the activation / deactivation of the serving cell. For example, assuming that serving cell 1 is configured of DL CC1, activation of serving cell 1 means activation of DL CC1. If the serving cell 2 assumes that DL CC2 and UL CC2 are configured to be configured, activation of serving cell 2 means activation of DL CC2 and UL CC2. In this sense, each component carrier may correspond to a serving cell.
- the concept of the serving cell which is generally understood in the prior art can be changed, it can be divided into primary cell (secondary cell) and secondary cell (secondary cell) again.
- the primary cell refers to a cell operating at a primary frequency, and is a cell in which the terminal performs an initial connection establishment procedure or connection reestablishment with the base station, or is indicated as a primary cell in a handover process. It means a cell.
- the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
- a primary component carrier refers to a component carrier (CC) corresponding to a primary cell.
- the PCC is a CC in which the terminal initially makes a connection (connection or RRC connection) with the base station among several CCs.
- the PCC is a special CC that manages a connection (Connection or RRC Connection) for signaling regarding a plurality of CCs and manages UE context, which is connection information related to a terminal.
- the PCC is connected to the terminal and always exists in the active state in the RRC connected mode.
- the downlink component carrier corresponding to the primary cell is called a downlink primary component carrier (DL PCC), and the uplink component carrier corresponding to the primary cell is called an uplink major component carrier (UL PCC).
- DL PCC downlink primary component carrier
- U PCC uplink major component carrier
- Secondary component carrier refers to a CC corresponding to the secondary cell. That is, the SCC is a CC allocated to the terminal other than the PCC, and the SCC is an extended carrier for the additional resource allocation other than the PCC and may be divided into an activated or deactivated state.
- the downlink component carrier corresponding to the secondary cell is referred to as a DL secondary CC (DL SCC), and the uplink component carrier corresponding to the secondary cell is referred to as an uplink secondary component carrier (UL SCC).
- DL SCC DL secondary CC
- UL SCC uplink secondary component carrier
- the primary cell and the secondary cell have the following characteristics.
- the primary cell is used for transmission of the PUCCH.
- the primary cell is always activated, while the secondary cell is a carrier that is activated / deactivated according to specific conditions.
- RLF Radio Link Failure
- the primary cell may be changed by a security key change or a handover procedure accompanying a RACH (Random Access CHannel) procedure.
- NAS non-access stratum
- the primary cell is always configured with a pair of DL PCC and UL PCC.
- a different CC may be configured as a primary cell for each UE.
- the primary cell can be replaced only through a handover, cell selection / cell reselection process.
- RRC signaling may be used to transmit system information of a dedicated secondary cell.
- a plurality of component carriers (CCs), that is, a plurality of serving cells may be supported.
- Such a carrier aggregation system may support cross-carrier scheduling.
- Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or other components other than the component carrier basically linked with the specific component carrier.
- a scheduling method for resource allocation of a PUSCH transmitted through a carrier That is, the PDCCH and the PDSCH may be transmitted through different downlink CCs, and the PUSCH may be transmitted through another uplink CC other than the uplink CC linked with the downlink CC through which the PDCCH including the UL grant is transmitted. .
- a carrier indicator indicating a DL CC / UL CC through which a PDSCH / PUSCH for which PDCCH provides control information is transmitted is required.
- a field including such a carrier indicator is hereinafter called a carrier indication field (CIF).
- a carrier aggregation system supporting cross carrier scheduling may include a carrier indication field (CIF) in a conventional downlink control information (DCI) format.
- CIF carrier indication field
- DCI downlink control information
- 3 bits may be extended, and the PDCCH structure may include an existing coding method, Resource allocation methods (ie, CCE-based resource mapping) can be reused.
- FIG. 8 illustrates a heterogeneous network including a macro cell and a small cell.
- next generation communication standards including 3GPP LTE-A, heterogeneous networks in which small cells with low power transmission power, such as picocells, femtocells or microcells, overlap in existing macro cell coverage are discussed.
- a macro cell may overlap one or more micro cells.
- the service of the macro cell is provided by the macro base station (Macro eNodeB, MeNB).
- the macro cell and the macro base station may be used interchangeably.
- the terminal connected to the macro cell may be referred to as a macro UE.
- the macro terminal receives a downlink signal from the macro base station and transmits an uplink signal to the macro base station.
- the small cell is also referred to as femto cell, pico cell or micro cell.
- the service of the small cell is provided by a pico base station (Pico eNodeB), a home base station (Home eNodeB, HeNB), a relay node (Relay Node, RN) and the like.
- a pico base station (Pico eNodeB), a home base station (Home eNodeB, HeNB), and a relay node (Relay Node, RN) are collectively referred to as a home base station (HeNB).
- the micro cell and the home base station may be used interchangeably.
- inter-cell interference becomes a problem because macro cells and small cells overlap. As shown, when the terminal is at the boundary between the macro cell and the small cell, the downlink signal from the macro cell may act as interference. Similarly, downlink signals of small cells can also act as interference.
- the connection with the small cell 200-1 may be lost due to the interference from the macro cell 200. This means that the coverage of the small cell 200-1 is smaller than expected.
- the connection with the macro cell 200 may be lost due to interference from the small cell 200-1. This means that a shadow area occurs in the macro cell 200.
- 3GPP attempts to solve such inter-cell interference problem by time division.
- eICIC enhanced inter-cell interference coordination
- the time division scheme introduced in LTE Release-10 is called enhanced inter-cell interference coordination (ICIC), which means that it has evolved compared to the existing frequency division scheme. It is called a primary cell, and the interfering cell is defined as a victim cell or a secondary cell, and in a specific subframe, an attacker cell or a primary cell performs data transmission. By stopping, the terminal can maintain the connection with the victim cell (Victim cell) or the secondary cell in the subframe. In other words, when heterogeneous cells coexist with one another, one cell stops transmitting signals to a terminal which receives a very high interference in a certain area so that the interference signal is hardly transmitted.
- IIC enhanced inter-cell interference coordination
- the essential control information is, for example, a cell-specific reference signal (CRS).
- CRS cell-specific reference signal
- the CRS signal is present in the 0, 4, 7, 11th OFDM symbols in each subframe on the time axis. Therefore, only the CRS signal is transmitted on the 0, 4, 7, 11th OFDM symbols in the ABS frame.
- FIG. 9 is a block diagram illustrating a structure of a UE according to one disclosure of the present specification.
- Orthogonal Frequency Division Multiplexing (OFDM) is used for downlink, whereas Single-Carrier (SC) -FDMA similar to OFDM (OF) is used for uplink.
- SC Single-Carrier
- SC-FDMA may also be referred to as DFT-s OFDM.
- the SC-FDMA transmission scheme it is possible to avoid the non-linear distortion interval of the power amplifier (power amplifier), and thus the transmission power efficiency can be increased in the terminal with limited power consumption. Accordingly, user throughput may be high.
- SC-FDMA is also very similar to OFDM in that signals are divided into subcarriers using Fast Fourier Transform (FFT) and Inverse-FFT (IFFT).
- FFT Fast Fourier Transform
- IFFT Inverse-FFT
- a problem in the conventional OFDM transmitter is that signals carried on each subcarrier on the frequency axis are converted into signals on the time axis by the IFFT. That is, since the IFFT is performed in the same parallel operation, an increase in Peak to Average Power Ratio (PAPR) occurs.
- PAPR Peak to Average Power Ratio
- SC-FDMA is performed by IFFT after DFT spreading unlike OFDM. That is, a transmission scheme in which IFFT is performed after DFT spreading is called SC-FDMA. Therefore, SC-FDMA is also called DFT spread OFDM (DFT-s-OFDM) in the same sense.
- DFT-s-OFDM DFT spread OFDM
- SC-FDMA are similar to that of OFDM, which provides robustness for multipath channels, and at the same time fundamentally solves the disadvantage of increasing PAPR through conventional IFFT operation, enabling efficient power amplifiers. It was made.
- the UE 100 includes an RF unit 110.
- the RF unit 110 includes a transmitter 111 and a receiver 112.
- the transmitter 111 includes a Discrete Fourier Transform (DFT) unit 1111, a subcarrier mapper 1112, an IFFT unit 1113, a CP inserter 11144, and a wireless transmitter 1115.
- the transmitting end 111 of the RF unit 110 may be, for example, a scramble unit (scramble unit), a modulation mapper (modulation mapper), a layer mapper (not shown) and a layer permutator (not shown); It may further include a layer permutator, which may be disposed before the DFT unit 1111.
- the transmitter of the RF unit 110 first passes the information through the DFT 1111 before mapping the signal to the subcarrier. After subcarrier mapping of the signal spread (or precoded in the same sense) by the DFT unit 1111 through the subcarrier mapper 1112, the time axis is again passed through an inverse fast fourier transform (IFFT) unit 1113. Make it a signal of the award.
- IFFT inverse fast fourier transform
- the peak-to-average power ratio (PAPR) of the time domain signal after the IFFT unit 1113 is decreased.
- PAPR peak-to-average power ratio
- SC-FDMA PAPR or CM (cubic metric) may be lowered.
- the DFT unit 1111 outputs complex-valued symbols by performing a DFT on the input symbols. For example, when N tx symbols are input (where N tx is a natural number), the DFT size is N tx .
- the DFT unit 1111 may be called a transform precoder.
- the subcarrier mapper 1112 maps the complex symbols to each subcarrier in the frequency domain. The complex symbols may be mapped to resource elements corresponding to resource blocks allocated for data transmission.
- the subcarrier mapper 1112 may be called a resource element mapper.
- the IFFT unit 53 performs an IFFT on the input symbol and outputs a baseband signal for data which is a time domain signal.
- the CP inserter 1114 copies a part of the rear part of the base band signal for data and inserts it in the front part of the base band signal for data.
- ISI Inter-symbol interference
- ICI inter-carrier interference
- the 3GPP camp has been actively standardizing LTE-Advanced, which is an improvement of LTE, and has adopted a clustered DFT-s-OFDM scheme that allows non-contiguous resource allocation. have.
- the clustered DFT-s OFDM transmission scheme is a variation of the conventional SC-FDMA transmission scheme.
- the clustered DFT-s OFDM transmission scheme divides the data symbols passed through the precoder into a plurality of sub-blocks and maps the data symbols separated from each other in the frequency domain.
- An important feature of the clustered DFT-s-OFDM scheme is that it enables frequency selective resource allocation, which can flexibly cope with a frequency selective fading environment.
- the LTE system maintains a single carrier characteristic in the uplink, whereas the LTE-A system allows a case in which DFT_precoding data is discontinuously allocated on the frequency axis or simultaneously transmitted by the PUSCH and the PUCCH.
- the receiving end 112 of the RF unit 110 includes a wireless receiving unit 1121, CP removal unit 1122, FFT unit 1123, equalizer 1124 and interference cancellation unit 1125 and the like.
- the wireless receiving unit 1121, the CP removing unit 1122, and the FFT unit 1123 of the receiving end perform reverse functions of the wireless transmitting unit 1115, the CP insertion unit 1114, and the IFF unit 1113 at the transmitting end 111. Perform.
- the interference canceller 1125 removes or mitigates the interference included in the received signal.
- the interference cancellation unit 1125 is added to cope with the recent surge in wireless data demand and to remove interference as shown in FIG. 8.
- FIG. 10 is a block diagram illustrating the operation of the interference canceling unit illustrated in FIG. 9 in a block form.
- the receiver 112 to which the interference canceller 1125 is added may be conceptually implemented by subtracting an interference signal from a received signal.
- IC Interference Cancellation
- IRC Interference Rejection Combiner
- the complexity of the receiver to which the interference canceling unit 1125 is added depends on the maximum number of cells to be interference canceled and the type of signal to be removed.
- FIG. 10 an operation of performing interference cancellation on up to two interference sources is shown as a block.
- the signal to be subjected to interference cancellation may be a Cell-specific Reference Signal (CRS), a Physical Broadcasting Channel (PBCH), a Sync Channel (SCH), a Physical Downlink Shared Channel (PDSCH), or the like.
- CRS Cell-specific Reference Signal
- PBCH Physical Broadcasting Channel
- SCH Sync Channel
- PDSCH Physical Downlink Shared Channel
- the receiver the so-called IC receiver, or the IRC receiver, to which the interference canceling unit 1125 is added, may cope with the recently exploding wireless data demand.
- the reception signal (Y) is generally expressed as follows for the transmission signal (X) and the channel (H).
- the equalizer 1124 illustrated in FIG. 9 performs equalization by multiplying an equalizer coefficient W with respect to the received signal Y and may be expressed as follows.
- the equalization coefficient (W) is typically obtained by a minimum mean squared error (MMSE) criterion, and can be obtained from the estimated channel H as follows.
- MMSE minimum mean squared error
- R N + 1 means a covariance matrix of the received interference.
- SFBC Space Frequency Block Code
- CDD Large Delay Cyclic Delay Diversity
- Closed Loop MIMO different precodings may be applied on a physical downlink shared channel (PDSCH) allocated to one UE in units of at least 6 physical resource blocks (PRBs) on a frequency basis.
- PDSCH physical downlink shared channel
- PRBs physical resource blocks
- the statistical characteristics of the interference signal transmitted from the neighboring base station may be changed in each worst case in each PRB and in every subframe of 1 ms in time.
- the interference estimation should be made in every subframe in time in every RB in frequency.
- the covariance matrix of the received interference changes according to the variation of the statistical characteristics of the transmission signal including the transmission mode and the precoding. Therefore, when using the IRC reception algorithm, there is a problem in that interference estimation can only be performed on signals in one PRB in frequency and in one subframe in time.
- the eNodeB proposes to send additional signaling to the UE so that the UE can know the statistical characteristics of the interference signal introduced into the cell.
- 11A and 11B are flowcharts illustrating a method according to the first embodiment presented herein.
- a serving cell is a small cell 200-1 and a neighbor cell is a macro cell 200.
- a serving cell is a macro cell 200, and a neighbor cell is a cell. The situation which is a small cell 200-1 is shown.
- the serving cell exchanges information with a neighboring cell through an X2 interface to check a resource allocation state of the neighboring cell, thereby identifying characteristics of an interference signal introduced into the cell.
- the interference cancellation assistance information is transmitted to the UE 100.
- the statistical characteristic herein refers to a coherence section in the frequency unit and time unit of the interference signal.
- the interference estimation / removal assistance information may be broadcast to all UEs in a cell on a broadcast channel, such as a PBCH.
- the interference estimation / removal support information may be delivered to a specific UE through an RRC signal.
- the specific UE may be in an RRC connected state.
- the specific UE may be a UE capable of IC / IRC.
- the serving cell transmits a UE capability inquiry message to the UE 100 and receives UE capability information in response thereto.
- the UE performance information includes IC / IRC capability.
- the interference estimation / removal support information transmitted by the serving cell to the UE 100 includes information for a frequency domain and information for a time domain.
- Information for the frequency domain may be referred to as NoiseCoherenceF for example.
- Information for the time domain may be referred to as NoiseCoherenceT, for example.
- the information for the frequency domain may include information on the number of PRBs to be averaged in the frequency domain.
- the information for the time domain may include information about the number of radio frames / subframes belonging to the moving window section in the time domain or alpha coefficient information of an alpha tracker used as an IIR filter.
- NoiseCoherenceF may be represented by 2 bits as shown in Table 1 below.
- the two bits may indicate values of 1,2,4,8. For example, when the value of 2 bits is 00, 1 may be indicated, 01 may indicate 2, 10 may indicate 4, and 11 may indicate 8.
- NoiseCoherenceT may be expressed as an integer multiple of 10 ms corresponding to the length of one radio frame, as shown in Table 1 below.
- the interference estimation is not performed in one PRB unit and one subframe unit as in the past, but within the interference estimation / removal support information.
- interference may be estimated using both samples belonging to a shorter section in frequency / time. Therefore, reliability can be improved.
- the equalizer 1124 of the receiver 112 of the UE 100 estimates the interference using all the samples belonging to the shorter interval in frequency / time, and thereby the receiver of the UE 100.
- the interference canceller 1125 of 112 may increase the reliability of the interference canceller.
- This improved reliability may improve the performance of the UE 100 to demodulate the signal.
- the value of the channel quality indicator (CQI) increases toward the good side, so that the UE 100 reports a higher modulation and coding scheme (MCS) when reporting channel state information (CSI).
- MCS modulation and coding scheme
- CSI channel state information
- FIG. 12 is a flowchart illustrating a method according to a second embodiment of the present disclosure.
- the serving cell not only obtains resource allocation information from the neighbor cell, but also actively requests the neighbor cell to restrict resource allocation.
- the serving cell may actively transmit a request to the neighbor cell to limit the minimum resource allocation interval in frequency and time.
- the neighbor cell collects more data through buffering at a time when a smaller amount of data transmission is required than the minimum resource allocation interval, or transmits a plurality of terminals requesting a small amount of data transmission to adjacent frequencies.
- embodiments described so far may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof. Specifically, this will be described with reference to FIG. 13.
- FIG. 13 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- the base station 200 includes a processor 201, a memory 202, and an RF unit 203.
- the memory 202 is connected to the processor 201 and stores various information for driving the processor 201.
- the RF unit 203 is connected to the processor 201 to transmit and / or receive a radio signal.
- the processor 201 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 51.
- the wireless device 100 includes an RF unit 110, a processor 120, a memory 130 and.
- the memory 130 is connected to the processor 121 and stores various information for driving the processor 121.
- the RF unit 110 is connected to the processor 120 to transmit and / or receive a radio signal.
- the processor 120 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the wireless device may be implemented by the processor 120.
- 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 RF unit may include a baseband circuit for processing a radio signal.
- 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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Abstract
Description
NoiseCoherenceF | 1,2,4,8 (2 bits) |
NoiseCoherenceT | 10ms, 20ms, 30ms. ... |
Claims (12)
- 서빙셀로부터 간섭 추정 지원 정보를 수신하는 단계와, 상기 간섭 추정 지원 정보는 시간 영역을 위한 정보와 주파수 영역을 위한 정보를 포함하고, 상기 시간 영역을 위한 정보는 간섭 신호의 코히런스(Coherence)가 유지되는 시간 영역에서의 무선 프레임 또는 서브프레임의 구간을 지시하고, 상기 주파수 영역을 위한 정보는 간섭 신호의 코히런스(Coherence)가 유지되는 주파수 영역에서의 구간을 지시하고;상기 간섭 추정 지원 정보 내의 시간 영역을 위한 정보와 주파수 영역을 위한 정보를 이용하여, 이웃셀로부터 유입되는 간섭 신호를 추정하는 단계와;상기 추정된 간섭을 제거함으로써 상기 서빙셀로부터의 신호를 검출하는 단계를 포함하는 것을 특징으로 하는 간섭 제거 수신 방법.
- 제1항에 있어서,상기 간섭 추정 지원 정보는 상기 서빙셀이 상기 이웃셀로부터 획득한 정보에 의해서 생성되는 것을 특징으로 하는 간섭 제거 수신 방법.
- 제1항에 있어서, 상기 시간 영역을 위한 정보는상기 무선 프레임의 길이인 10ms의 정수배로 표현되는 것을 특징으로 하는 간섭 제거 수신 방법.
- 제1항에 있어서, 상기 주파수 영역을 위한 정보가 지시하는 주파수 영역에서의 구간은리소스 블록(RB)의 개수로 표현되는 것을 특징으로 하는 간섭 제거 수신 방법.
- 제4항에 있어서, 상기 주파수 영역을 위한 정보에 의해 지시되는 상기 RB의 개수는1,2,4,8 중 어느 하나인 것을 특징으로 하는 간섭 제거 수신 방법.
- 제4항에 있어서, 상기 주파수 영역을 위한 정보는2비트로 표현되고,상기 2비트 의 값이‘00’인 경우 1을 지시하고,상기 2비트 의 값이 ‘01’인 경우 2를 지시하고,상기 2비트 의 값이 ‘10’인 경우 4를 지시하고,상기 2비트 의 값이 ‘11’인 경우 8을 지시하는 것을 특징으로 하는 간섭 제거 수신 방법.
- 제1항에 있어서, 상기 간섭 추정 지원 정보는브로드캐스트 채널을 통해서 수신되거나, RRC 시그널을 통해 수신되는 것을 특징으로 하는 간섭 제거 수신 방법.
- 무선 통신 시스템의 단말로서,무선 수신부와;상기 무선 수신부를 제어하여, 서빙셀로부터 수신된 간섭 추정 지원 정보를 이용하여 이웃셀로부터 유입되는 간섭 신호를 추정하는 간섭 추정부와,상기 간섭 추정 지원 정보는 시간 영역을 위한 정보와 주파수 영역을 위한 정보를 포함하고, 상기 시간 영역을 위한 정보는 간섭 신호의 코히런스(Coherence)가 유지되는 시간 영역에서의 무선 프레임 또는 서브프레임의 구간을 지시하고, 상기 주파수 영역을 위한 정보는 간섭 신호의 코히런스(Coherence)가 유지되는 주파수 영역에서의 구간을 지시하고; 그리고상기 추정된 간섭 신호를 제거함으로써 상기 서빙셀로부터의 신호를 검출하는 간섭 제거부를 포함하는 것을 특징으로 하는 단말.
- 제8항에 있어서, 상기 시간 영역을 위한 정보는상기 무선 프레임의 길이인 10ms의 정수배로 표현되는 것을 특징으로 하는 단말.
- 제8항에 있어서, 상기 주파수 영역을 위한 정보가 지시하는 주파수 영역에서의 구간은리소스 블록(RB)의 개수로 표현되는 것을 특징으로 하는 단말.
- 제10항에 있어서, 상기 주파수 영역을 위한 정보에 의해 지시되는 상기 RB의 개수는1,2,4,8 중 어느 하나인 것을 특징으로 하는 단말.
- 제10항에 있어서, 상기 주파수 영역을 위한 정보는2비트로 표현되고,상기 2비트 의 값이‘00’인 경우 1을 지시하고,상기 2비트 의 값이 ‘01’인 경우 2를 지시하고,상기 2비트 의 값이 ‘10’인 경우 4를 지시하고,상기 2비트 의 값이 ‘11’인 경우 8을 지시하는 것을 특징으로 하는 단말.
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US20150282190A1 (en) | 2015-10-01 |
US9426813B2 (en) | 2016-08-23 |
KR20150082213A (ko) | 2015-07-15 |
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