WO2014208953A1 - 전 이중 무선 방식을 지원하는 무선 접속 시스템에서 자기 간섭 측정 방법 및 장치 - Google Patents
전 이중 무선 방식을 지원하는 무선 접속 시스템에서 자기 간섭 측정 방법 및 장치 Download PDFInfo
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- WO2014208953A1 WO2014208953A1 PCT/KR2014/005516 KR2014005516W WO2014208953A1 WO 2014208953 A1 WO2014208953 A1 WO 2014208953A1 KR 2014005516 W KR2014005516 W KR 2014005516W WO 2014208953 A1 WO2014208953 A1 WO 2014208953A1
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- Prior art keywords
- channel
- cyclic shift
- terminal
- interference
- shift variable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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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
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
- H04J13/0062—Zadoff-Chu
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
Definitions
- the present invention relates to methods for measuring magnetic interference using a reference signal to which cyclic shift is applied in a full duplex radio (FDR) system as one of wireless access systems, and apparatuses for supporting the same.
- FDR full duplex radio
- Wireless access systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless access system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include CDMA (code division multiple access) ⁇ "] system, FDMA (frequency division multiple access) system, TDMA (time division multiple access) system, OFDMA (orthogonal frequency division multiple access) system ⁇ 1, SC- And a single carrier frequency division multiple access (FDMA) system.
- a base station or a terminal divides radio resources into frequencies by frequency division duplex (FDD) or time division duplex (TDD). Communication is performed using a half duplex radio (HDR) scheme.
- FDD frequency division duplex
- TDD time division duplex
- HDR half duplex radio
- the FDR communication scheme refers to a base station and / or a terminal performing simultaneous transmission and reception of different signals in the same frequency / time resource region.
- An object of the present invention is to provide a method for efficient communication.
- Another object of the present invention is to provide methods for estimating a radio channel to eliminate magnetic interference in an FDR system.
- Another object of the present invention is to provide an apparatus supporting these methods.
- the present invention provides methods for measuring magnetic interference using a reference signal to which cyclic shift is applied in an FDR system, and apparatuses for supporting the interference.
- a method for estimating a self-interference channel by a base station in a wireless access system supporting full dual radio (FDR) method includes a channel signal including a first cyclic shift variable allocated to a terminal. Transmitting a downlink (DL) magnetic channel reference signal (SI-RS) for estimating a self-interference (SI) channel generated based on the second cyclic shift variable and receiving a DL SI-RS # And receiving an uplink (UL) SI-RS generated based on the first cyclic shift variable and estimating an SI channel using the DL SI-RS and the UL SI-RS.
- DL downlink
- SI-RS magnetic channel reference signal
- UL uplink
- a base station for estimating a self-interference (SI) channel in a radio access system supporting a full dual radio (FDR) scheme may be configured to link an SI channel with a transmitter, a receiver, and the transmitter and the receiver. It may include a processor configured to estimate. At this time, the processor controls the transmitter to determine the first cyclic shift variable assigned to the terminal.
- SI self-interference
- FDR full dual radio
- a downlink (DL) magnetic channel reference signal (SI-RS) for estimating a self-interference (SI) channel generated based on a second cyclic shift variable, and controlling a receiver Receives DL SI-RS, receives an uplink (UL) SI-RS generated based on the first cyclic shift variable, and estimates an SI channel using the DL SI-RS and the UL SI-RS. Can be.
- DL downlink
- UL uplink
- a method for estimating a self-interference channel by a terminal in a wireless access system supporting a full duplex (FDR) scheme includes a channel signal including a first cyclic shift variable assigned to the terminal. Receiving an uplink (UL) self-interfering reference signal (SI-RS) generated based on the first cyclic shift variable, receiving an UL SI-RS, and receiving a second cyclic shift variable.
- the method may include receiving a downlink (DL) SI-RS generated based on the signal and estimating an SI channel using the DL SI-RS and the UL SI-RS.
- a terminal configured to estimate a self-interference channel in a wireless access system supporting a full dual radio (FDR) scheme may include a self-interference channel in association with a transmitter and a receiver and such a transmitter and a receiver.
- the processor controls a transmitter and a receiver to receive a channel signal including a first cyclic shift variable assigned to the terminal, and generates an uplink (UL) self-interfering reference signal (SI ⁇ ) generated based on the first cyclic shift variable.
- RS uplink
- receive UL SI-RS receive downlink (DL) SI-RS generated based on the second cyclic shift variable
- Hado Tok may be configured.
- the second cyclic shift variable may be a fixed value on the system, and the first cyclic shift variable may be a value changed according to the terminal.
- the DL SI-RS and the UL SI-RS may be transmitted through the same resource region in a specific subframe.
- the DL SI-RS and the UL SI-RS may be transmitted through different resource regions in a specific subframe.
- the estimation of the SI channel may be performed in consideration of one or more of the total number of cyclic shift variables, the first cyclic shift variable, and the second cyclic shift variable.
- FIG. 1 is a diagram for explaining physical channels and a signal transmission method using the same.
- FIG. 2 shows the structure of a radio frame.
- 3 is a diagram illustrating a resource grid for a downlink solo.
- 5 shows a structure of a downlink subframe.
- FIG. 6 shows a subframe structure of an LTE-A system according to cross carrier scheduling.
- FIG. 7 is a layout diagram illustrating an example of a wireless access system that supports FDR.
- 8 is a diagram illustrating a conceptual diagram of self-interference in an FDR system.
- FIG. 10 is a diagram illustrating a signal recovery state when the power of the interference signal has a power smaller than that of the preferred signal.
- FIG. 11 shows one of block diagrams of a transmitter and a receiver to which techniques for canceling magnetic interference are applied.
- FIG. 12 is a diagram illustrating an example of an antenna IC scheme using an antenna-to-antenna distance.
- FIG. 13 is a diagram illustrating an example of an antenna IC technique using a phase shifter.
- FIG. 16 illustrates one of methods of configuring an SI-RS for SI channel estimation.
- FIG. 17 is a diagram illustrating another method of configuring an SI-RS for SI channel estimation.
- FIG. 18 is a diagram illustrating one reference signal transmission method for estimating an SI channel at a base station.
- FIG. 19 is a diagram illustrating one reference signal transmission method for estimating an SI channel in a terminal.
- 20 illustrates one of methods for estimating an SI channel at a base station and a terminal, respectively.
- the apparatus described with reference to FIG. 23 is means for implementing the methods described with reference to FIGS. 1 to 22.
- the present invention described in detail below defines a structure of an FDR region in a full duplex radio (FDR) system as one of wireless access systems.
- the present invention provides methods and apparatuses for transmitting allocation information on a configured FDR region.
- the following embodiments are a combination of the components and features of the present invention in a predetermined form. Unless stated otherwise, it may be considered optional. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, some 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 replaced with other configurations or features of the various embodiments.
- Embodiments of the present invention have been described with reference to data transmission / reception relations between a base station and a mobile station.
- the base station is meant as a terminal node of a network that directly communicates with a mobile station. Certain operations described as being performed by the base station in this document may be performed by an upper node of the base station in some cases.
- various operations performed for communication with a mobile station in a network composed of a plurality of network nodes including a base station may be performed. It may be performed by a base station or other network nodes other than the base station. At this time,
- a 'base station' may be replaced by terms such as a fixed station, a Node B, an eNodeB (eNB), an advanced base station (ABS), or an access point.
- eNB eNodeB
- ABS advanced base station
- a terminal may be a user equipment (UE), a mobile station (MS), a subscriber station (SS), or a mobile subscriber station (MSS: Mobile). It may be replaced with terms such as Subscriber Station, Mobile Terminal, or Advanced Mobile Station (AMS).
- UE user equipment
- MS mobile station
- SS subscriber station
- MSS mobile subscriber station
- AMS Advanced Mobile Station
- the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service
- the receiving end refers to a fixed and / or mobile node that receives a data service or a voice service. Therefore, in uplink, a mobile station may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a mobile station may be a receiving end and a base station may be a transmitting end.
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of the IEEE 802.XX system, the 3rd Generation Partnership Project (3GPP) system, the 3GPPLTE system, and the 3GPP2 system, which are wireless access systems.
- Embodiments of the present invention may be supported by 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321 and 3GPP TS 36.331 documents. That is, no description of the embodiments of the invention, the steps or parts apparent that can be described with reference to the document. In addition, all terms disclosed in this document may be described by the above standard document.
- the magnetic interference signal may be used as the same meaning as the interference signal.
- the interference signal is a self-interference signal, which means a signal transmitted from a transmission antenna of a specific terminal or a base station is received by its reception antenna.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented by a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented with a radio technology such as IEEE 802.1 1 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-21, Evolved UTRA (E-UTRA), or the like.
- UTRA is a part of Universal Mobile Telecommunications System (UMTS).
- 3GPP Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A (Advanced) system is an improved system of the 3GPP LTE system.
- embodiments of the present invention are described mainly for the 3GPP LTE / LTE-A system, but may be applied to an IEEE 802.16e / m system and the like.
- a terminal receives information from a base station through downlink (DL) and transmits information to a base station through uplink (UL).
- the information transmitted and received between the base station and the terminal includes general data information and various control information, and various physical channels exist according to the type / use of the information ' transmitted and received.
- FIG. 1 is a diagram for explaining physical channels that can be used in embodiments of the present invention and a signal transmission method using the same.
- the terminal In the state in which the power is turned off, the terminal is powered on again or enters a new cell, and performs an initial cell search operation such as synchronizing with the base station in step S11.
- the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID.
- P-SCH Primary Synchronization Channel
- S-SCH Secondary Synchronization Channel
- the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information in a cell.
- PBCH physical broadcast channel
- the UE may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.
- DL RS downlink reference signal
- the UE After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) according to physical downlink control channel (PDCCH) and physical downlink control channel information in step S12. By doing so, more specific system information can be obtained.
- PDCH physical downlink control channel
- the terminal may perform a random access procedure such as steps S13 to S16 to complete the access to the base station.
- the UE transmits a preamble through a physical random access channel (PRACH) (S13), the physical downlink control channel and the A response message for the preamble can be received through the physical downlink shared channel (S14).
- PRACH physical random access channel
- the UE performs contention resolution such as transmitting an additional physical random access channel signal (S15) and receiving a physical downlink control channel signal and a corresponding physical downlink shared channel signal (S16). Procedure).
- the UE may receive a physical downlink control channel signal and / or a physical downlink shared channel signal (S) and a physical uplink shared channel (A) as a general uplink / downlink signal transmission procedure.
- a PUSCH (physical uplink shared channel) signal and / or a physical uplink control channel (PUCCH) signal may be transmitted (S18).
- UCI uplink control information
- HARQ-ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK
- SR Scheduling Request
- CQI Channel Quality Indication
- PMI Precoding Matrix Indication
- RJ Rank Indication
- UCI is generally transmitted periodically through a PUCCH, but may be transmitted through a PUSCH when control information and traffic data should be transmitted at the same time.
- the UCI may be aperiodically transmitted through the PUSCH by the network request / instruction.
- FIG. 2 shows a structure of a radio frame used in embodiments of the present invention.
- FIG. 2 (a) shows a frame structure type 1.
- the type 1 frame structure can be applied to both full duplex Frequency Division Duplex (FDD) systems and half duplex FDD systems.
- FDD Frequency Division Duplex
- One subframe consists of two consecutive slots
- the i-th subframe consists of 2i and 2i + l. That is, a radio frame consists of 10 subframes.
- the time taken to transmit one subframe is called a transmission time interval ( ⁇ ).
- the slot includes a plurality of OFDM symbols or SC-FDMA symbols in the time domain and a plurality of resource blocks in the frequency domain.
- One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain. Since 3GPP LTE uses OFDMA in downlink, the OFDM symbol is for representing one symbol period. An OFDM symbol may be referred to as one SC-FDMA symbol or a symbol interval.
- a resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.
- 10 subframes may be used simultaneously for downlink transmission and uplink transmission during each 10 ms period. At this time, uplink and downlink transmission are separated in the frequency domain.
- the terminal cannot simultaneously transmit and receive.
- the structure of the above-described radio frame is merely an illustration, the number of slots included in the number of sub-frames or sub 'frame included in the radio frame, the number of OFDM symbols included in the slot may change variously Can be.
- the type 2 frame includes a special subframe consisting of three fields: a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS downlink pilot time slot
- GP guard period
- UpPTS uplink pilot time slot
- the DwPTS is used for initial cell search, synchronization or channel estimation in the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- Table 1 below shows the structure of the special frame (length of DwPTS / GPUpPTS).
- FIG. 3 is a diagram illustrating a resource grid for a downlink slot that can be used in embodiments of the present invention.
- one downlink slot includes a plurality of OFDM symbols in the time domain.
- one downlink slot includes seven OFDM symbols and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.
- Each element on a resource grid is a resource element, and one resource block includes 12 ⁇ 7 resource elements. Included in the downlink slot
- the number NDL of resource blocks depends on the downlink transmission bandwidth.
- the structure of the uplink slot may be the same as the structure of the downlink slot.
- FIG. 4 shows a structure of an uplink subframe that can be used in embodiments of the present invention.
- the UL subframe may be divided into a control region and a data region in the frequency domain, inverse.
- the control region is allocated a PUCCH carrying uplink control information.
- the data area is allocated with a PUSCH carrying user data.
- one UE does not simultaneously transmit a PUCCH and a PUSCH.
- the PUCCH for one UE is allocated an RB pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots. This RB pair allocated to the PUCCH is said to be frequency hopping at the slot boundary (slot boundary).
- FIG. 5 shows a structure of a downlink subframe that can be used in embodiments of the present invention.
- up to three OFDM symbols are allocated to control channels to which control channels are allocated starting from a symbol index 0 in a first slot in a subframe, and the remaining OFDM symbols are data to which a PDSCH is allocated.
- This is an area (data fegion).
- An example of a downlink control channel used in 3GPP LTE includes a Physical Control Format Indicator Channel (PCFICH), a PDCCH, and a Physical Hybrid-ARQ Indicator Channel (PHICH).
- PCFICH Physical Control Format Indicator Channel
- PDCCH Physical Hybrid-ARQ Indicator Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of a control region) used for transmission of control channels in the subframe.
- the PHICH is a male answer channel for the uplink and carries an ACK (Acknowledgement) / NACK (Negative-Acknowledgement) signal for a hybrid automatic repeat request (HARQ).
- Downlink control information (DCI: control information transmitted through the PDCCH) information).
- the downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (Tx) power control command for a certain terminal group. [95] 2 .
- LTE system 3rd Generation Partnership Project Long Term Evolution (Rel-8 or Rel-9) system
- CC component carrier
- MCM Multi-Carrier Modulation
- CA carrier aggregation
- Carrier aggregation may be replaced by the words carrier aggregation, carrier matching, multi-component carrier environment (Multi-CC) or multicarrier environment.
- the multi-carrier means the aggregation of carriers (or carrier aggregation), wherein the aggregation of carriers means not only merging between contiguous carriers but also merging between non-contiguous carriers.
- the number of component carriers aggregated between downlink and uplink may be set differently.
- the case where the number of downlink component carriers (hereinafter referred to as 'DL CC') and the number of uplink component carriers (hereinafter referred to as 'UL CC') is the same is called symmetric merging. This is called asymmetric merging.
- carrier aggregation may be commonly used with terms such as carrier aggregation, bandwidth aggregation, spectrum aggregation, and the like.
- carrier aggregation in which two or more component carriers are combined, aims to support up to 100 MHz bandwidth. Smaller than the target band
- the bandwidth of the combining carrier may be limited to the bandwidth used by the existing system in order to maintain backward compatibility with the existing IMT system.
- the existing 3GPP LTE system supports ⁇ 1.4, 3, 5, 10, 15, 20 ⁇ MHz bandwidth
- 3GPP LTE-advanced system ie, LTE-A
- the carrier aggregation system used in the present invention may support carrier aggregation by defining a new bandwidth regardless of the bandwidth used in the existing system.
- the carrier aggregation may be divided into an intra-band CA and an inter-band CA.
- Intra-band carrier coalescing means that a plurality of DL CCs and / or UL CCs are located adjacent to or adjacent in frequency. In other words, it may mean that the carrier frequencies of the DL CCs and / or UL CCs are located in the same band.
- an environment far from the frequency domain may be referred to as an inter-band CA.
- the terminal may use a plurality of radio frequency (RF) terminals to perform communication in a carrier aggregation environment.
- RF radio frequency
- the LTE-A system uses the concept of a cell to manage radio resources.
- the carrier aggregation environment described above may be referred to as a multiple cell environment.
- a sal is defined as a combination of a downlink resource (DL CC) and an uplink resource (UL CC), but the uplink resource is not required. Accordingly, the cell may be configured with only downlink resources or with downlink resources and uplink resources.
- a specific UE when a specific UE has only one configured serving cell, it may have one DL CC and one UL CC, but when a specific UE has two or more configured serving cells Has as many DL CCs as the number of cells
- the number of CCs may be equal to or less than that.
- DL CC and UL CC may be configured. That is, when a specific UE has a plurality of configured serving cells, a carrier aggregation environment in which a ULCC is larger than the number of DLCCs may be supported.
- Carrier coalescing may also be understood as the merging of two or more cells, each having a different carrier frequency (center frequency of the cell).
- the term 'cell' should be distinguished from 'cell' as a geographic area covered by a commonly used base station.
- intra-band multi-cell the above-described intra-band carrier merging is referred to as intra-band multi-cell, and inter-band carrier merging is referred to as inter-band multi-cell.
- Cells used in the LTE-A system include a primary cell (PCell: Primary Cell) and a secondary cell (SCell: Secondary Cell).
- PCell Primary Cell
- SCell Secondary Cell
- P cell and S cell can be used as a serving cell. have.
- the UE that is in the R C_CON ECTED state but the carrier aggregation is not configured or does not support the carrier aggregation, there is only one serving cell composed of the P cells.
- a UE in RRC_CONNECTED state and carrier aggregation is configured, one or more serving cells may exist, and the entire serving cell includes a P cell and one or more S cells.
- the serving cells may be configured through RRC parameters.
- PhysCellld is the cell's physical layer identifier and has an integer value from 0 to 503.
- SCelllndex is a short identifier used to identify an SCell and has an integer value from 1 to 7.
- ServCelllndex is a short identifier used to identify a serving cell (P cell or S cell) and has an integer value from 0 to 7. A value of zero is applied to P cells, and SCelllndex is pre-assigned to apply to S cells. That is, a cell having the smallest cell ID (or cell index) in ServCelllndex becomes a P cell.
- a P cell refers to a cell operating on a primary frequency (or primary CC).
- the UE may be used to perform an initial connection establishment process or to perform a connection re-establishment process and may also refer to a cell indicated in the handover process.
- P Sal is a serving cell set in a carrier aggregation environment. Means the center of control-related communication. That is, the UE may receive and transmit a PUCCH only in its own P cell, and may use only the P cell to acquire system information or change a monitoring procedure.
- E-UTRAN Evolved Universal Terrestrial Radio Access
- RRC ConnectionReconfigutaion message of a higher layer including mobility control information to a UE supporting a carrier aggregation environment. It may be.
- the S cell may refer to a cell operating on a secondary frequency (or secondary CC). Only one P cell is allocated to a specific terminal, and one or more S cells may be allocated. The S cell is configurable after the RRC connection is established and may be used to provide additional radio resources. PUCCH does not exist in the cells other than the P cell, that is, the S cell, in the serving cell set in the carrier aggregation environment. .
- the E-UTRAN may provide all system information related to the operation of the related cell in the RRC_CONNECTED state through a dedicated signal.
- the change of the system information may be controlled by the release and addition of the related S cell, and at this time, an RRC connection reconfigutaion message of a higher layer may be used.
- the E-UTRAN may perform dedicated signaling with different parameters for each terminal, rather than broadcasting in an associated S cell.
- the E-UTRAN may configure a network including one or more S cells in addition to the P cell initially configured in the connection establishment process.
- the P cell and the S cell can operate as respective component carriers.
- the primary component carrier (PCC) may be used in the same sense as the P cell
- the secondary component carrier (SCC) may be used in the same meaning as the SCell.
- Cross carrier scheduling may be referred to as Cross Component Carrier Scheduling or Cross Cell Scheduling.
- a UL CC in which a DL Grant (PDCCH) and a PDSCH are transmitted to the same DL CC or a PUSCH transmitted according to a PDCCH (UL Grant) transmitted in a DL CC is linked to a DL CC receiving the UL Grant. Means to be transmitted through.
- Cross carrier scheduling includes an E> L CC having received a PUSCH 7 ⁇ UL grant transmitted according to a PDCCH (UL Grant) transmitted from a DL Grant (PDCCH) and a PDSCH, respectively, or from a DL CC. This means that it is transmitted through a UL CC other than the linked UL CC.
- PDCCH UL Grant
- PDCCH DL Grant
- PDSCH DL Grant
- cross-carrier scheduling may be activated or deactivated UE-specifically and may be known for each UE semi-statically through higher layer signaling (eg, RRC signaling). .
- higher layer signaling eg, RRC signaling
- a carrier indicator field (CIF: Carrier Indicator Field) indicating a PDSCH / PUSCH indicated by the corresponding PDCCH is transmitted to the PDCCH.
- the PDCCH may allocate PDSCH resource or PUSCH resource to one of a plurality of component carriers using CIF. That is, when the PDCCH on the DL CC allocates PDSCH or PUSCH resources to one of the multi-aggregated DL / UL CC, CIF is set.
- the DCI format of LTE Release-8 may be extended according to CIF.
- the configured CIF may be fixed as a 3 bit field or the position of the configured CIF may be fixed regardless of the DCI format size.
- the PDCCH structure (same coding and resource mapping based on the same CCE) of LTE Release-8 may be reused.
- the PDCCH on the DL CC allocates PDSCH resources on the same DL CC or PUSCH resources on a single linked UL CC, CIF is not configured.
- the same PDCCH structure (same coding and resource mapping based on the same CCE) and DCI format as in LTE Release-8 may be used.
- the UE When cross carrier scheduling is possible, the UE needs to monitor PDCCHs for a plurality of DCIs in the control region of the monitoring CC according to a transmission mode and / or bandwidth for each CC. Therefore, it is necessary to configure the search space and PDCCH monitoring that can support this.
- the UE DLCC set represents a set of DL CCs scheduled for the UE to receive a PDSCH
- the UE UL CC set represents a set of UL CCs scheduled for the UE to transmit a PUSCH.
- a PDCCH monitoring set represents a set of at least one E> L CC for performing PDCCH monitoring.
- the PDCCH monitoring set may be the same as the terminal DL CC set or may be a subset of the terminal DL CC set.
- the PDCCH monitoring set may include at least one of E ) L CCs in the UE DL CC set.
- the PDCCH monitoring set may be defined separately regardless of the UE DL CC set.
- the DL CC included in the PDCCH monitoring set may be configured to always enable self-scheduling for the linked UL CC.
- the UE DL CC set, the UE UL CC set, and the PDCCH monitoring set may be configured UE-specifically, UE group-specifically, or cell-specifically.
- the PDCCH monitoring set When cross carrier scheduling is deactivated, it means that the PDCCH monitoring set is always the same as the UE DL CC set. In this case, an indication such as separate signaling for the PDCCH monitoring set is not necessary.
- the PDCCH monitoring set when cross-carrier scheduling is activated, is preferably defined in the terminal DL CC set. That is, PDSCH or In order to schedule the PUSCH, the base station transmits the PDCCH through only the PDCCH monitoring set.
- FIG. 6 illustrates a subframe structure of an LTE-A system according to cross carrier scheduling used in embodiments of the present invention.
- DL CCs three DL component carriers (DL CCs) are combined in a DL subframe for an LTE-A terminal, and DL CC 'A' represents a case in which a PDCCH monitoring DL CC is configured.
- each DLCC may transmit a PDCCH that schedules its PDSCH without CIF.
- only one DL CC 'A' may transmit a PDCCH for scheduling its PDSCH or PDSCH of another CC using the CIF.
- DL CCs ' ⁇ ' and 'C' which are not set to PDCCH monitoring E> L CC do not transmit the PDCCH.
- the FDR system can be applied to the LTE / LTE-A system described above. That is, the frame structure defined in the LTE / LTE-A system, the control signal transmission / reception method, and the support for the carrier coupling scheme may all be applied to the FDR system.
- the frame structure defined in the LTE / LTE-A system, the control signal transmission / reception method, and the support for the carrier coupling scheme may all be applied to the FDR system.
- a specific interference cancellation method occurring in the FDR system will be described in detail.
- the FDR refers to a system that simultaneously supports data transmission and reception using the same resource (that is, the same time and the same frequency) in one UE.
- FDR may be a new type of wireless access system. However, in the embodiments of the present invention, it is assumed that the FDR system operates based on the LTE / LTE-A system described with reference to FIGS. 1 to 6.
- 7 is a layout diagram illustrating an example of a wireless access system supporting FDR.
- a radio access system supporting FDR includes a macro base station (eNB) managing a general cell, a small base station managing a small cell, and a terminal (ie, a wireless unit).
- the small base station includes a micro base station (micro eNB), a femto base station (FemtoeNB) and a pico base station (Pico eNB).
- IDI means that a signal transmitted from a transmission antenna of a base station or a terminal acts as interference due to the FDR characteristic.
- the signal transmitted from the transmission antenna of the specific device is transmitted with a greater power than the signal to receive. This is because the signal transmitted from the transmitting antenna is received by the receiving antenna with little attenuation since the distance between the transmitting antenna and the receiving antenna of the specific device is short. Therefore, the transmission signal transmitted by the transmission antenna of the specific device is received with a power much greater than the desired signal (desired signal) that the specific device expects to receive from the other party.
- the link interference between terminals means that an uplink signal transmitted by a specific terminal is received by another terminal located adjacent to act as interference.
- Link interference between base stations means that signals transmitted between heterogeneous base stations between base stations or HetNet situations are received by receiving antennas of other base stations and act as interference.
- magnetic interference in the device (hereinafter, magnetic interference) is the first problem to be solved in order to operate the FDR due to the influence of interference occurring only in the FDR.
- 8 is a diagram illustrating a conceptual diagram of self-interference in an FDR system.
- FIG. 8 illustrates a case of performing data communication between terminals for convenience of description, the same may be applied to a case of performing data communication between a terminal and a base station.
- the transmission signal transmitted by the transmission antenna of the first terminal UE1 to the second terminal UE2 is received by the reception antenna of the first terminal and serves as an interference signal.
- This self-interference is unique unlike other interferences.
- the first terminal may be regarded as a signal that perfectly knows the interference signal acting as interference. This is because the self-interference signal coming into the reception antenna of the first terminal is a transmission signal transmitted by the first terminal.
- the second is that the power of the interference signal acting as the interference is much higher than the power of the preferred signal that the first terminal intends to receive. This is because the distance between the transmitting antenna and the receiving antenna of the first terminal is very small compared to the distance between the first terminal and the second terminal. This may cause the receiver to not completely remove the interference signal even if the terminal is completely aware of the signal acting as interference.
- the receiving end of the terminal may use an analog to digital converter (ADC) to convert the received signal into a digital signal.
- ADC analog to digital converter
- the ADC measures the power of the received signal, adjusts the power level of the received signal, then quantizes it and converts it into a digital signal.
- the interference signal is received at a much higher power than the desired signal, the signal characteristic of the preferred signal may be buried at the quantization level and may not be restored.
- FIG. 9 is a diagram illustrating signal distortion due to quantization error when the power of an interference signal has a power greater than that of a preferred signal
- FIG. 10 is a signal recovery when the power of the interference signal has a power smaller than that of a preferred signal. It is a figure showing the state 9 shows that the desired signal is very distorted even if the interference signal is removed when quantization is performed in the situation where the interference signal has a much larger power than the preferred signal when the quantization is assumed to be 4 bits.
- FIG. 10 shows an example in which an interference signal has a smaller power than a desired signal, and then the desired signal is restored after the interference signal is removed.
- FIG. 11 shows one of block diagrams of a transmitter and a receiver to which techniques for canceling magnetic interference are applied.
- a transmitting end includes an encoder for coding data bits, a mapper for mapping encoded data bits to physical resources, and an inverse fast fourier transform (IFFT) for modulating data in OFDM manner.
- a digital to analog converter (DAC) for modulating a digital signal into an analog signal, a waveform shaping filter for converting a modulated signal into a desired waveform, an up converter and an antenna for increasing the frequency of the signal may be included.
- the receiving end includes an antenna for receiving a signal, a down converter for lowering the frequency of the received signal, an automatic gain converter (AGC) for automatically adjusting the amplification factor so that the output of the circuit is in a predetermined range, and an analog.
- the signal may include an ADQ analog to digital convertor (ADQ) for modulating a digital signal, a fast fourier transform (FFT) for converting an input signal into data in a frequency domain, a demapper and a decoder for decoding the output signal.
- ADQ analog to digital convertor
- FFT fast fourier transform
- antenna interference cancellation is performed in an antenna part of a transmitter and a receiver, and an analog IC is performed in a waveform shaping filter and an up converter part of a transmitter and an AGC and down converter part of a receiver. Is performed.
- ADC ICs are performed in the DACs and ADCs of the transmitter and receiver, and baseband ICs (or digital ICs) are performed in the remainder of the transmitter and receiver.
- the antenna IC technique is the simplest technique that can be implemented among all the IC techniques.
- 12 is a diagram illustrating an example of an antenna IC technique using an antenna-to-antenna distance
- FIG. 13 is a diagram illustrating an example of an antenna IC technique using a phase shifter.
- one UE may perform interference cancellation using three antennas.
- two antennas are used as the transmit antennas (Tx) and one antenna is used as the receive antennas (Rx).
- the two transmitting antennas are installed with a distance of about wavelength / 2 based on the receiving antenna. This is for the signal transmitted from each transmitting antenna to be received as a signal whose phase is inverted from the reception antenna position. Therefore, the interference signal among the signals finally received by the receiving antenna converges to zero.
- an interference signal may be removed using a phase shifter to invert the phase of the second transmission antenna Tx2.
- the left figure shows an antenna arrangement for eliminating magnetic interference using two receiving antennas
- the right figure shows an antenna arrangement for removing interference using two transmitting antennas.
- the antenna interference cancellation scheme is affected by the bandwidth and the center frequency of the transmitting signal. That is, the smaller the bandwidth of the transmission signal, the higher the center frequency, the higher the interference cancellation performance. 14 illustrates interference cancellation performance according to a bandwidth and a center frequency of a signal when using the antenna interference cancellation method.
- the interference signal is a signal known to the transmitter, the biggest problem that cannot eliminate the interference is the ADC. Therefore, interference can be eliminated by maximizing the performance of the ADC. However, this is in practice due to the quantization bit limitation of the ADC. It is difficult to apply. However, as the performance of the ADC has been gradually improved recently, the performance of eliminating the required magnetic interference may be lowered.
- the analog IC is a method of removing interference before the ADC.
- the analog IC eliminates magnetic interference by using an analog signal. This may be done in the RF domain or may be performed in the IF domain.
- the analog IC technique is a method of subtracting an interference signal from a signal received by a receiving antenna by delaying phase and time of an transmitted analog signal.
- the advantage of the analog IC technique is that the number of antennas is different from the antenna IC technique. Only one antenna for transmission and reception is required. However, because the analog signal is processed, additional distortion may occur due to implementation complexity and circuit characteristics. This may occur and this may cause a significant difference in interference cancellation performance.
- a digital IC is a technique for removing interference after the ADC, and means all interference cancellation techniques performed in the base band region.
- the digital IC can be implemented by subtracting the transmitted digital signal from the received digital signal.
- bumping or precoding may be performed in the case of a terminal or a base station transmitting by using multiple antennas. If these schemes are performed at baseband, they can also be classified as digital ICs.
- the digital IC can be quantized so that the digitally modulated signal can recover information about a desired signal
- the IC technique described in Sections 3.1.1 to 3.1.3 is required to perform the digital IC. One or more of them After removing the interference with the technique, the difference in signal power between the interference signal and the desired signal must be within the ADC range.
- the SIC block may be an analog interference canceller for removing an analog signal or an RF signal or a digital interference canceller for removing a baseband digital signal.
- the combination may be an analog-digital interference canceller.
- the number of SIC blocks increases exponentially as the number of antennas increases.
- magnetic interference can be eliminated by using one SIC block, but a total of nine SIC block stones are required to apply FDR to a 3x3 MIMO system.
- a self-interference (SI) channel In order to perform FDR operation in a wireless access system, a self-interference (SI) channel should be accurately estimated at a transceiver. Because the SI channel estimation error occurs, the SI cannot be removed accurately, and since the interference signal is transmitted at a large power in preparation for the desired signal, the transceiver cannot properly recover the desired signal. Accordingly, the present invention proposes estimation techniques for accurately estimating a self-interference channel, defining a new RS that can reduce resource overhead, and estimating a self-interference channel in order for a transceiver to correctly recover a preferred signal.
- the self-interference channel has the following characteristics unlike the radio channel between the base station and the terminal, the radio channel between the base station and the base station, or the radio channel between the terminal and the terminal.
- the SI channel means an interference channel between a transmitting antenna and a receiving antenna used in one base station or one terminal (refer to FIG. 8). It can be seen that there is almost no channel change characteristic between the transmitting antenna and the receiving antenna. That is, in the existing radio channel, a change in environment occurs due to the movement of a terminal or a time-varying characteristic occurs due to an environment change between a transmitting end and a receiving end. In rare cases, there is little environmental change in the SI channel. Therefore, SI channel can be regarded as semi-static channel with little time-varying characteristics.
- Embodiments of the present invention to be described below are described under the assumption that the SI channel is similar to the semi-static and one-lap channel characteristics described above. However, embodiments of the present invention are not limited to these semi-static and one-lap channel characteristics, and can be applied to a wireless environment with less RMS delay or maximum delay compared to a general multipath channel.
- Embodiments of the present invention propose new reference signals for estimating an SI channel in an FDR system. These reference signals are defined as Sdf Interference Reference Signals (SI-RS).
- SI-RS Sdf Interference Reference Signals
- the downlink SIRS transmitted by the base station for SI channel estimation and downlink transmission and the uplink SI-RS signal transmitted by the UE for SI channel estimation and uplink transmission are configured as shown in FIG. 16 or 17. Can be.
- FIG. 16 is a diagram illustrating one method for configuring an SI-RS for SI channel estimation.
- an SI-RS may be configured and transmitted and received in the entire frequency band of the fourth OFDM symbol region in one slot. That is, in the corresponding RS thimble, the downlink SI-RS transmitted by the base station and the uplink SI-RS transmitted by the UE may overlap and be transmitted and received in the same time and frequency domain.
- Figure 16 One OFDM symbol in one slot is used as an SI-RS. However, two or more OFDM symbols may be used as SI-RS symbols in consideration of the coherence time in one slot.
- FIGS. 16 illustrates the slot structure of the LTE / LTE-A system described with reference to FIGS. 3 to 5. Therefore, if the frame structure of the FDR system has a structure different from those of FIGS. 3 to 5, the position to which the RS symbol is allocated may also be changed to a position that can be the most efficient channel estimation.
- resource waste can be reduced by equalizing the resource region to which the UL SIRS transmitted by the UE is allocated to the resource region to which the DL SI-RS transmitted by the BS is identical due to the characteristics of the FDR system. Efficient channel estimation is possible.
- FIG 17 illustrates another method of configuring an SI-RS for SI channel estimation.
- SI-RS configuration is allocated using a lattice structure in downlink, and a specific OFDM symbol is allocated in uplink.
- the entire band can be used to configure the SI-RS. That is, in order to estimate the SI channel, the base station may allocate a downlink SI-RS having a lattice structure in a specific subframe and allocate an SI-RS symbol as shown in FIG. 16 for uplink use and use it for SI channel estimation.
- FIG. 17 shows an example in which the downlink SI-RS and the uplink SI-RS are configured in different structures.
- an uplink SI-RS symbol for estimating an SI channel is the fourth slot of the first slot. It is an example configured using an OFDM symbol.
- the SI-RS symbol for SI estimation may be transmitted very sparse in the time domain by using a characteristic that the SI channel is semi-static.
- the SI-RS structure of FIG. 17 is shown in FIG. 17. Unlike the configuration, in units of arbitrary subframes, specific slots in that subframe
- resource allocation information indicating a position to which an SI-RS symbol for SI channel estimation is allocated is fixedly defined by a system parameter previously defined between a terminal and a base station, or higher layer signaling. Through the semi-statically assigned through or through the control channel may be transmitted to the terminal dynamically.
- the uplink SI-RS may not be allocated to all system bandwidths of a specific OFDM symbol, but may be allocated only to a specific frequency domain. This is due to the fact that the fading characteristic in the frequency domain is assumed to be flat, assuming that the SI channel is similar to one lap.
- an SI-RS for estimating an SI channel in a specific frequency domain is transmitted, and a position to which the SI-RS is allocated is defined by a predefined system parameter, transmitted through higher layer signaling, or controlled. Can be allocated dynamically through the channel.
- the SI-RS when it is transmitted only in a specific frequency domain, it may be configured using a continuous frequency or subcarrier or may be configured to transmit the SI-RS only in a specific subcarrier by setting a predetermined rule. .
- the uplink SI-RS structure may be designed in the same manner as the SI-RS transmission structure for estimating the SI channel.
- the SI-RS is described by borrowing an RS sequence of the LTE / LTE-A system (see TS 36.211 vll. 3, section 5.5).
- this is just one example and may configure the SI-RS using a sequence having excellent autocorrelation characteristics.
- the reference signal sequence / ⁇ (") is defined by Equation 1 by the cyclic shift « of the basic sequence ⁇ , republic
- n) e ja "r uv (n), 0 ⁇ n ⁇ M ⁇ s
- m is a value satisfying the condition ⁇ ⁇ m ⁇ N ⁇ -V .
- Multiple reference signal sequences are defined through different values of «from a single base sequence.
- F ′ v ( «) may be any sequence, and in particular, it will be described using a Zadoff-Chu sequence to utilize a cyclic shift.
- v ( «) can be constructed as follows:
- Equation 2 the basic sequence ⁇ , admir(0), ..., ⁇ ( ⁇ — 1) is given by Equation 2 below.
- the length of the Zadofchu sequence is defined by the largest prime number satisfying W S ⁇ M ⁇ .
- the cyclic shift value is defined as in Equation 5 below.
- a criterion for determining an M value for determining a cyclic shift value is configured by using a delay profile characteristic of an SI channel, and how many maximum delay tap values exist in one OFDM symbol interval. It can be determined by whether it can enter. That is, the M value may be defined as in Equation 6 or Equation 7 below. .
- M value is defined as a value obtained by dividing an OFDM symbol interval by a maximum delay value of an SI channel.
- Equation 7 takes into account some redundancy in the OFDM symbol interval, and f denotes an arbitrary constant.
- the M value is equal to any constant since it is determined by the values defined on the system.
- the cyclic shift value is determined according to the cyclic shift variable " k in Equation 5.
- the cyclic shift variable is a dynamic indication method, which is transmitted to the UE for each TTI (Transmit Time Interval; for example, subframe).
- the cyclic shift variable n k may be transmitted through DCI formats included in a PDCCH signal or an E-PDCCH signal in the LTE / LTE-A system.
- the SI-RS may be configured by using the same cyclic shift variable for a predetermined number or more of TTIs.
- the base station may inform the terminal of the cyclic shift variable ⁇ through higher layer signaling (eg, MAC signal or RRC signal).
- the cyclic shift variables used for the downlink SI-RS transmitted from the base station (ie, DL SI-RS) and the uplink SI-RS transmitted from the UE (ie, UL SI-RS) are mutually different. The method of setting so that it does not overlap is demonstrated.
- one of cyclic shift variables may be fixedly allocated for DL SI-RS, and the remaining values 1 to (M-1) may be allocated for UL SI-RS.
- M-1 may be allocated for UL SI-RS.
- 3 ⁇ 4 may be fixed as a cyclic shift value for the DL SI-RS transmitted by the base station, and the remaining values may be allocated to the terminal. That is, the SI-RS transmitted by the base station may be configured not to perform a cyclic shift but to perform only a cyclic shift of the SI-RS transmitted by the terminal.
- cyclic shift variable ⁇ may be calculated as in Equation 8.
- 18 is a diagram illustrating one method of transmitting a reference signal for estimating an SI channel at a base station.
- the base station eNB may inform the terminal of the cyclic shift variable.
- the cyclic shift variable may be directly indicated by a corresponding value or may be indicated in an index form (S1810).
- the cyclic shift variable value may be transmitted through a PDCCH signal / E-PDCCH signal / MAC signal / RRC signal.
- the terminal may generate the UL SI-RS for the uplink using the received cyclic shift variable.
- the UL SI-RS may be generated by the method described in Section 4.2 (S1820).
- the base station may generate DLSI-RS for downlink use by using cyclic shift variables other than the cyclic shift variable allocated to the terminal (S1830).
- the SI-RSs generated in steps S1820 and S1830 may be allocated to resource regions as in the method described with reference to FIG. 16 or 17.
- the base station transmits the generated DL SI-RS with the data to the terminal (S1840).
- the UE and the base station are currently operating in the FDR mode. That is, the terminal and the base station may use the entire band for uplink and downlink purposes. Therefore, the DL SI-RS transmitted by the base station through the transmit antenna in step S1840 may be received by the base station again through the receive antenna (S1850). In addition, the terminal may transmit the UL SI-RS generated in step S1820 to the base station for SI channel estimation (S1860).
- the base station may estimate the SI channel using the DL / UL SI-RSs received in steps S1850 and S1860 (S1870).
- FIG. 19 is a diagram illustrating one reference signal transmission method for estimating an SI channel in a terminal.
- the eNB may inform the UE of a cyclic shift variable.
- the cyclic shift variable may be directly indicated by a corresponding value or may be indicated in an index form (S1910).
- the cyclic shift variable value may be transmitted through a PDCCH signal / E-PDCCH signal / MAC signal / RRC signal.
- the UE may generate the UL SI-RS for uplink using the received cyclic shift variable.
- the UL SI-RS may be generated by the method described in Section 4.2.
- the base station may generate a DLSI-RS for downlink use by using a cyclic shift variable other than the cyclic shift variable allocated to the terminal (S1920).
- the SI-RSs generated in operation S1920 may be allocated to a resource region as in the method described with reference to FIG. 16 or 17.
- the terminal transmits the generated UL SI-RS to the base station together with the data (S1930).
- the terminal and the base station are currently operating in the FDR mode. That is, the terminal and the base station may use the entire band for uplink and downlink purposes. Accordingly, the UL SI-RS transmitted by the terminal through the transmit antenna in step S1930 may be received again through the receive antenna of the terminal (S1940).
- the base station may transmit a DLSI-RS generated by a cyclic shift variable different from the cyclic shift variable allocated to the terminal to the terminal for SI channel estimation (S1950).
- the terminal may estimate the SI channel using the DL / UL SI-RSs received in steps S1940 and S1950 (S1960).
- 20 is a diagram illustrating one method of estimating an SI channel at a base station and a terminal.
- the base station or the terminal converts the received SI-RS into a signal in the frequency domain by performing a fast fourier transform (FFT).
- FFT fast fourier transform
- this process may be determined as an OFDM demodulation process (S2010).
- the base station or the terminal may perform channel estimation by using one of existing channel estimation methods (eg, a Least square technique) on the signal converted into the frequency domain (S2020).
- existing channel estimation methods eg, a Least square technique
- the base station or the terminal performs IFFT (Inverse-FFT) again to convert the estimated channel into a time domain signal (S2030).
- IFFT Inverse-FFT
- the base station or the terminal splits the converted time-domain channel in consideration of the cyclic shift variable allocated to each terminal (S2040).
- the partitioning method for the time domain channel may split the samples of all OFDM symbols into a total number M of cyclic shift variables, and may split the cyclic shift variables allocated to each terminal to estimate the SI channel. have.
- the base station or the terminal selects a channel to be acquired from the time domain channel divided in step S2040. Thereafter, after performing a time shift on the selected channel, the remaining regions are nulled. Then base station Alternatively, the terminal may perform a FFT to obtain a channel response value for the corresponding SI channel (S2050).
- the terminal may also obtain a specific frequency channel response using the method described with reference to FIG. 22.
- the BS or the UE may estimate the SI channel by performing steps S2010 to S2050 using the received SI-RS and the cyclic shift variable. That is, the SI channel can be removed by estimating the SI channel in the FDR system. This ensures data quality in the FDR system.
- the apparatus described with reference to FIG. 23 is means for implementing the methods described with reference to FIGS. 1 to 22.
- a user equipment may operate as a transmitting end in uplink and operate as a receiving end in downlink.
- an e-Node B eNB
- eNB e-Node B
- the terminal and the base station may include a transmitter (Transmitter: 2340, 2350) and a receiver (receiver: 2350, 2370) to control the transmission and reception of information, data and / or messages, respectively,
- a transmitter Transmitter: 2340, 2350
- a receiver receiver
- antennas 2300 and 2310 for transmitting and receiving data and / or messages may be included.
- the transmitter and the receiver are illustrated as sharing an antenna, but as shown in FIG. 8, separate antennas may be provided in the transmitter and the receiver.
- one antenna is illustrated in FIG. 23, two or more antennas may be provided.
- the terminal and the base station each of the processor (processor 2320, 2330) for performing the above-described embodiments of the present invention and the memory (2380, 2390) that can temporarily or continuously store the processing of the processor Each may include.
- Embodiments of the present invention can be performed using the components and functions of the above-described terminal and base station apparatus.
- the processor of the base station or the terminal may generate and transmit and receive SI-RSs for the SI channel estimation used in the FDR system by combining the methods described in Sections 1 to 4 described above.
- the processor of the base station or the terminal may estimate the SI channel by using the received SI-RS. See Section 4 for details.
- the transmission and reception modules included in the terminal and the base station include a packet modulation and demodulation function, a high speed packet channel coding function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, and a time division duplex (DD) for data transmission. Time Division Duplex (TDD) packet scheduling and / or channel multiplexing may be performed.
- the terminal and the base station of FIG. 23 may further include low power radio frequency (RF) / intermediate frequency (IF) models.
- RF radio frequency
- IF intermediate frequency
- each of the transmission and reception terminals may be referred to as a transmitter receiver, and when used together, may be referred to as a transceiver.
- the terminal is a personal digital assistant (PDA), a seal roller phone, a personal communication service (PCS) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA).
- PDA personal digital assistant
- PCS personal communication service
- GSM Global System for Mobile
- WCDMA Wideband CDMA
- a phone, a mobile broadband system (MBS) phone, a hand-held PC, a notebook PC, a smart phone, or a multimode multiband (MM-MB) terminal may be used.
- a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and includes a terminal incorporating data communication functions such as schedule management, fax transmission and reception, which are functions of a personal portable terminal, in a mobile communication terminal. Can mean.
- multimode multiband terminals can be equipped with a multi-modem chip to operate in both portable Internet systems and other mobile communication systems (e.g., Code Division Multiple Access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Speak the terminal.
- CDMA Code Division Multiple Access
- WCDMA wideband CDMA
- Embodiments of the present invention may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
- the method according to the embodiments of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), and programmable PLDs. logic devices), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- programmable PLDs programmable PLDs.
- logic devices field programmable gate arrays (FPGAs)
- processors controllers, microcontrollers, microprocessors, and the like.
- the method according to the embodiments of the present invention may be implemented in the form of modules, procedures, or functions that perform the functions or operations described above.
- the software code may be stored in the memory units 2380 and 2390 and driven by the processors 2320 and 2330.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- Embodiments of the present invention can be applied to various wireless access systems.
- various radio access systems include 3rd Generation Partnership Project (3GPP), 3GPP2 and / or IEEE 802.XX (Institute of Electrical and Electronic Engineers 802) systems.
- Embodiments of the present invention can be applied not only to the various wireless access systems, but also to all technical fields that use the various wireless access systems.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP14818731.3A EP3016305B1 (en) | 2013-06-25 | 2014-06-23 | Method and apparatus for estimating self-interference in wireless access system supporting full-duplex radio communication |
US14/899,498 US9713143B2 (en) | 2013-06-25 | 2014-06-23 | Method and apparatus for estimating self-interference in wireless access system supporting full-duplex radio communication |
KR1020157033933A KR102174637B1 (ko) | 2013-06-25 | 2014-06-23 | 전 이중 무선 방식을 지원하는 무선 접속 시스템에서 자기 간섭 측정 방법 및 장치 |
CN201480036482.4A CN105340201B (zh) | 2013-06-25 | 2014-06-23 | 在支持全双工无线电通信的无线接入系统中估计自干扰的方法和设备 |
JP2016521218A JP6518657B2 (ja) | 2013-06-25 | 2014-06-23 | 全二重無線方式を支援する無線接続システムにおいて自己干渉測定方法及び装置 |
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US201361838885P | 2013-06-25 | 2013-06-25 | |
US61/838,885 | 2013-06-25 |
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WO2014208953A1 true WO2014208953A1 (ko) | 2014-12-31 |
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EP (1) | EP3016305B1 (ko) |
JP (1) | JP6518657B2 (ko) |
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WO2016127801A1 (en) | 2015-02-09 | 2016-08-18 | Huawei Technologies Co., Ltd. | System and method for training signals for full-duplex communications systems |
WO2016155467A1 (en) * | 2015-03-31 | 2016-10-06 | Huawei Technologies Co., Ltd. | Joint radio-frequency/baseband self-interference cancellation methods and systems |
WO2016171357A1 (ko) * | 2015-04-20 | 2016-10-27 | 엘지전자 주식회사 | Fdr 방식으로 동작하는 환경에서 참조신호 할당을 변경하기 위한 방법 및 이를 위한 장치 |
WO2016195427A1 (ko) * | 2015-06-03 | 2016-12-08 | 엘지전자 주식회사 | 풀-듀플렉스(full-duplex) 무선 통신 시스템에서 간섭 측정 기반 그룹핑 방법 및 이를 위한 장치 |
WO2017034106A1 (ko) * | 2015-08-26 | 2017-03-02 | 엘지전자 주식회사 | Fdr 방식으로 동작하는 환경에서 rs 모드를 변경하는 방법 및 이를 위한 장치 |
WO2018016710A1 (ko) * | 2016-07-21 | 2018-01-25 | 엘지전자 주식회사 | Fdr 모드로 동작하는 상황에서 자기간섭 신호를 제거하기 위한 방법 및 이를 위한 장치 |
CN107852381A (zh) * | 2015-07-14 | 2018-03-27 | Lg电子株式会社 | 用于在无线通信系统中估计非线性自干扰信道的方法及其装置 |
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JP6518657B2 (ja) | 2019-05-22 |
KR102174637B1 (ko) | 2020-11-05 |
EP3016305B1 (en) | 2018-08-15 |
US20160143013A1 (en) | 2016-05-19 |
JP2016529763A (ja) | 2016-09-23 |
US9713143B2 (en) | 2017-07-18 |
EP3016305A1 (en) | 2016-05-04 |
CN105340201B (zh) | 2018-01-23 |
KR20160023666A (ko) | 2016-03-03 |
CN105340201A (zh) | 2016-02-17 |
EP3016305A4 (en) | 2017-01-18 |
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