WO2016072532A1 - Procédé et appareil pour recevoir un signal dans un système d'accès sans fil avec prise en charge de transmission fdr - Google Patents

Procédé et appareil pour recevoir un signal dans un système d'accès sans fil avec prise en charge de transmission fdr Download PDF

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Publication number
WO2016072532A1
WO2016072532A1 PCT/KR2014/010502 KR2014010502W WO2016072532A1 WO 2016072532 A1 WO2016072532 A1 WO 2016072532A1 KR 2014010502 W KR2014010502 W KR 2014010502W WO 2016072532 A1 WO2016072532 A1 WO 2016072532A1
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Prior art keywords
terminal
transmitted
base station
relay
relay terminal
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PCT/KR2014/010502
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English (en)
Korean (ko)
Inventor
김진민
정재훈
김기태
최국헌
노광석
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엘지전자 주식회사
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Priority to PCT/KR2014/010502 priority Critical patent/WO2016072532A1/fr
Publication of WO2016072532A1 publication Critical patent/WO2016072532A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/08—Trunked mobile radio systems

Definitions

  • the present invention relates to a wireless access system that supports a FDR (Ful l Duplex Radio) transmission environment, and to a method for efficiently receiving a signal when applying FDR and an apparatus for supporting the same.
  • FDR Full l 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 iple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division mult iple access (CDMA) systems, frequency division mult iple access (FDMA) systems, time division mult iple access (TDMA) systems, orthogonal frequency division mult iple access (0FDMA) systems, SC Single carrier frequency division mult iple access (FDMA) systems.
  • CDMA code division mult iple access
  • FDMA frequency division mult iple access
  • TDMA time division mult iple access
  • OFDMA orthogonal frequency division mult iple access
  • An object of the present invention is to provide a method for efficiently transmitting and receiving data in an Wuxi access system supporting FDR transmission.
  • Another object of the present invention is to provide an apparatus supporting these methods.
  • a method for receiving a signal in a wireless access system supporting FDR (Ful l Duplex Radio) transmission relay from the base station to the terminal relay Receiving scheduling information on relay data transmitted through the terminal, the terminal receiving from the base station; And said And receiving the relay data from the relay terminal based on scheduling information, wherein the terminal and the relay terminal transmit and receive signals using FDR transmission, and the scheduling information includes the relay data and the relay terminal. It may include an indicator on which of the base station is transmitted and information on the frequency band of the signal transmitted by the relay terminal.
  • FDR Full Duplex Radio
  • a terminal for receiving a signal in a radio access system supporting Full Duplex Radio (FDR) transmission includes: an R Radi o Frequency (R Radiation Frequency) unit; And a processor, wherein the processor receives scheduling information for relay data transmitted from a base station through a relay of a relay terminal from the base station, and receives the relay data based on the scheduling information. Configured to receive from the relay terminal, wherein the terminal and the relay terminal transmit and receive signals using FDR transmission, and the scheduling information indicates an indicator of whether the relay data is transmitted from the relay terminal or the base station;
  • the relay terminal may include information on the frequency band of the signal transmitted.
  • the first downlink signal received by the terminal from the relay terminal and the second downlink signal received by the relay terminal from the base station are transmitted through a first frequency band and the terminal is transmitted to the relay terminal.
  • the first uplink signal transmitted, the second uplink signal transmitted by the relay terminal to the base station, and the third downlink signal received by the terminal from the base station may be transmitted through a second frequency band.
  • the first downlink signal received by the terminal from the relay terminal is transmitted through a first frequency band
  • the second downlink signal received by the relay terminal from the base station and the relay terminal to the base station is transmitted through a third frequency band
  • the third downlink signal received by the terminal from the base station and the first uplink signal transmitted by the terminal to the relay terminal are first transmitted. It can be transmitted over two frequency bands.
  • the first downlink signal received by the terminal from the relay terminal is transmitted through a first frequency band
  • the second downlink signal received by the relay terminal from the base station and the relay terminal is transmitted to the base station.
  • Second phase transmitting The downlink signal is transmitted through a fourth frequency band
  • the first uplink signal transmitted by the terminal to the relay terminal is transmitted through a second frequency band
  • the third downlink signal received by the terminal from the base station. May be transmitted through the third frequency band.
  • the first downlink signal received by the terminal from the relay terminal and the first uplink signal transmitted by the terminal to the relay terminal are transmitted through a first frequency band, and the relay terminal is transmitted from the base station.
  • the second downlink signal received and the second uplink signal transmitted by the relay terminal to the base station are transmitted through a third frequency band, and the third downlink signal received by the terminal from the base station is a second frequency. Can be transmitted over the band.
  • the scheduling information may be transmitted using a cross scheduling method.
  • the terminal may acquire synchronization with the relay terminal.
  • data can be efficiently transmitted and received in a wireless access system supporting FDR transmission.
  • FIG. 1 schematically illustrates an E-UMTS network structure as an example of a wireless communication system.
  • 2 illustrates a structure of a control plane and a user plane of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard.
  • 3 illustrates physical channels used in a 3GPP system and a general signal transmission method using the same.
  • FIG. 4 illustrates a structure of a radio frame used in an LTE system.
  • FIG. 5 illustrates a structure of a downlink radio frame used in an LTE system.
  • FIG. 6 illustrates a structure of an uplink subframe used in an LTE system.
  • FIG. 7 illustrates a configuration of a general multiple antenna (MIM0) communication system.
  • FIG. 10 is a diagram illustrating an example of an interference situation in an FDR scheme.
  • 11 shows an example of interference signal cancellation in a situation in which the interference signal has a much larger power than the desired signal.
  • FIG. 13 is a block diagram showing a location where a method for canceling magnetic interference (IC) is performed.
  • FIG. 14 is a structural diagram showing an antenna IC using a distance between antennas.
  • 15 is a structural diagram showing an antenna IC using a phase shifter.
  • 16 is a graph showing interference cancellation performance according to a bandwidth and a center frequency of a signal.
  • 17 is a structural diagram illustrating a system in which various interference cancellation methods are combined.
  • FIG. 18 illustrates a general system in which a base station communicates with a first terminal and a second terminal, respectively.
  • FIG. 19 illustrates a communication system using a mobile relay.
  • 20 to 23 are examples of a mobile relay system to which an FDR according to the present invention is applied.
  • Figure 24 illustrates a base station and a terminal that can be applied to an embodiment of the present invention. [Form for implementation of invention]
  • each component or feature may be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some components and / or features may be combined to form an embodiment of the present invention.
  • 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 another embodiment.
  • Embodiments of the present invention will be described with reference to the relationship between data transmission and reception between a base station and a terminal.
  • the base station has a meaning as a terminal node of the network that directly communicates with the terminal. Certain operations described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
  • BS Self-explanatory A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point (AP), and the like.
  • the repeater may be replaced by terms such as relay node (RN) and relay station (RS).
  • RN relay node
  • RS relay station
  • terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), an MSSC mobile subscriber station (MS), and a subscriber staion (SS).
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system . That is, the present invention among the embodiments of the present invention Steps or portions not described in order to clearly reveal the technical idea of the title may be supported by the above documents. In addition, all terms disclosed in this document can be described by the above standard document.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple
  • CDMA may be implemented by radio technologies such as UTRA Jniversal Terrestrial Radio Access (CDMA2000) or CDMA2000.
  • TDMA may be implemented in a wireless technology 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
  • 0FDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), and the like.
  • UTRA is part of UMTS Jniversal Mobile Telecommunications System.
  • 3GPP LTEdong term evolution (3GPP) is part of Evolved UMTS (E-UMTS) using E-UTRA, and employs 0FDMA in downlink and SC-FDMA in uplink.
  • LTE-A Advanced is an evolution of 3GPP LTE.
  • WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system).
  • IEEE 802.16e WiMA-OFDMA Reference System
  • advanced IEEE 802.16m WiMA-OFDMA Advanced system
  • a structure of a downlink radio frame will be described with reference to FIG. 1.
  • uplink / downlink data packet transmission is performed in units of subframes, and one subframe is defined as a predetermined time interval including a plurality of 0FDM symbols.
  • the 3GPP LTE standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to TDD time division duplex (FDD).
  • the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in a time domain. Single The time it takes for the subframe to be transmitted is called TTKtranstnission time interval).
  • TTKtranstnission time interval Single The time it takes for the subframe to be transmitted.
  • the length of one subframe may be lms, and the length of one slot may be 0.5 ms.
  • One slot includes a plurality of OFDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain. Since the 3GPP LTE system uses 0FDMA in downlink, the 0FDM symbol represents one symbol period. The 0FDM symbol may also be referred to as an SC-FDMA symbol or symbol period.
  • a resource block (RB) is a resource allocation unit and may include a plurality of consecutive subcarriers in one slot.
  • the number of 0FDM symbols included in one slot may vary depending on the configuration (conf igurat ion) of CP Cycl ic Pref ix).
  • CPs include extended CPs and normal CPC normal CPs.
  • the number of 0FDM symbols included in one slot may be seven.
  • the 0FDM symbol is configured by the extended CP, since the length of one 0FDM symbol is increased, the number of 0FDM symbols included in one slot is smaller than that of the normal CP.
  • the number of 0FDM symbols included in one slot may be six. If the channel state is unstable, such as in the case where the terminal moves at a high speed, an extended CP may be used to further reduce the interference between symbols.
  • one slot When a normal CP is used, one slot includes 7 0FDM symbols, and thus, one subframe includes 14 0FDM symbols.
  • the first two or three 0FDM symbols of each subframe may be allocated to a physical downl ink control channel (PDCCH), and the remaining 0FDM symbols may be allocated to a physical downl ink shared channel (PDSCH).
  • PDCCH physical downl ink control channel
  • PDSCH physical downl ink shared channel
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of symbols included in the slot may be changed in various ways.
  • the downlink slot includes a plurality of 0FDM symbols in the time domain and includes a plurality of resource blocks in the frequency domain.
  • one downlink pilot includes 70 FDM symbols
  • one resource block includes 12 subcarriers as an example, but is not limited thereto.
  • Each element on the resource grid It is called cattle (RE).
  • the resource element a (k, l) becomes a resource element located in the k th subcarrier and the 1st OFDM symbol.
  • one resource block includes 12 X 7 resource elements (in case of an extended CP, it includes 12 X6 resource elements). Since the interval of each subcarrier is 15 kHz, one resource block includes about 180 kHz in the frequency domain.
  • NDL is the number of resource blocks included in a downlink slot. The value of NDL may be determined according to a downlink transmission bandwidth set by scheduling of a base station.
  • PDSCH Physical Downlink Shared Channel
  • the basic unit of transmission is one subframe. That is, PDCCH and PDSCH are allocated over two slots.
  • Downlink control channels used in the 3GPP LTE system include, for example, a physical control format indicator channel (PCFICH), a physical downlink ink control channel (PDCCH), and a physical HARQ.
  • PCFICH physical control format indicator channel
  • PDCCH physical downlink ink control channel
  • HARQ Physical HARQ.
  • Indicator channel Physical Hybrid Automat ic repeat request Indicator Channel
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and includes information on the number of OFDM symbols used for control channel transmission in the subframe.
  • the PHICH includes a HARQ ACK / NACK signal as a response of uplink transmission.
  • Control information transmitted through the PDCCH is called Downlink Control Information (DCI).
  • DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain terminal group.
  • the PDCCH includes a resource allocation and transmission format of a downlink shared channel (DL-SCH), resource allocation information of an uplink shared channel (UL-SCH), paging information of a paging channel (PCH), system information on a DL-SCH, and a PDSCH.
  • Resource allocation of upper layer control messages such as random access response transmitted to the network, a set of transmit power control commands for individual terminals in a certain terminal group, transmission power control information, activation of VoIP voice over IP), and the like. It may include.
  • a plurality of PDCCHs may be transmitted in the control region.
  • the UE may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted in a combination of one or more consecutive Control Channel Elements (CCEs).
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on the state of a radio channel.
  • CCE is plural Circle to the element group.
  • the format of the PDCCH and the number of available bits are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • the base station determines the PDCCH format according to the DCI transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • the CRC is masked with an identifier called a Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific UE, the cell-NTCC-RNTI) identifier of the UE may be masked to the CRC.
  • RNTI Radio Network Temporary Identifier
  • a paging indicator identifier may be masked to the CRC.
  • the PDCCH is for system information (more specifically, system information block (SIB))
  • SIB system information block
  • RNTKSI-R TI may be masked to the CRC.
  • random access -RNTKRA-RNTI may be masked to the CRC.
  • the uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) including uplink control information is allocated.
  • a physical uplink shared channel (PUSCH) including user data is allocated.
  • PUCCH for one UE is allocated to an RB pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. This is called that a resource block pair allocated to a PUCCH is frequency-hopped at a slot boundary.
  • MIM0 Multiple Input Multiple Output
  • MIM0 technology does not rely on a single antenna path to receive an entire message.
  • the entire data can be received by combining a plurality of data pieces received through a plurality of antennas.
  • the MIM0 technique includes a spatial diversity technique and a spatial multiplexing technique.
  • Spatial diversity scheme can increase transmission reliability or widen cell radius through diversity gain. It is suitable for data transmission to a terminal moving at high speed.
  • Spatial multiplexing can increase the data rate without increasing the bandwidth of the system by simultaneously transmitting different data.
  • FIG. 5 is a configuration diagram of a wireless communication system having multiple antennas.
  • the number of transmit antennas is increased to NT and the number of receive antennas is increased to NR
  • theoretical channel transmission is proportional to the number of antennas, unlike when the transmitter or receiver uses multiple antennas. Dose is increased. Therefore, the transmission rate can be improved and the frequency efficiency can be significantly improved.
  • the transmission rate can theoretically increase as the rate of increase rate Ri multiplied by the maximum transmission rate Ro when using a single antenna.
  • the transmission information when there are NT transmission antennas, the maximum information that can be transmitted is NT.
  • the transmission information may be expressed as follows. Each transmission information 3 ⁇ 4 '' 3 ⁇ 4 may have different transmission powers. Each transmit power ,... If, ⁇ , the transmission information adjusted the transmission power can be expressed as follows.
  • ⁇ may be expressed as follows using the diagonal matrix ⁇ of the transmit power.
  • W is also called a precoding matrix.
  • the transmission signal X may be considered in different ways depending on two cases (for example, spatial diversity and spatial multiplexing).
  • spatial multiplexing different signals are multiplexed and the multiplexed signal is transmitted to the receiving side so that the elements of the information vector (s) have different values.
  • spatial diversity the same signal is plural Transmitted repeatedly through two channel paths, so that the elements of the information vector (s) have the same value.
  • a combination of spatial diversification and spatial diversity techniques can also be considered. That is, the same signal may be transmitted through, for example, three transmit antennas according to a spatial diversity scheme, and the remaining signals may be spatially multiplexed and transmitted to a receiver.
  • the reception signals 3 ⁇ 4, Note, and 3 ⁇ 4 of each antenna may be expressed as vectors as follows.
  • channels may be classified according to transmit / receive antenna indexes.
  • a channel passing through the receiving antenna i from the transmitting antenna j will be denoted by 3 ⁇ 4. Note that, at 3 ⁇ 4, the order of the index is the index of the transmitting antenna after the receiving antenna index is later.
  • FIG. 5 (b) shows a channel from NT transmit antennas to receive antenna i.
  • the channels may be bundled and displayed in the form of a vector and a matrix.
  • a channel arriving from a total of NT transmit antennas to a receive antenna i may be represented as follows.
  • all channels arriving from the NT transmit antennas to the N receive antennas may be represented as follows.
  • the real channel is added with white noise (GN) after passing through the channel matrix H.
  • the white noise added to each of the NR receive antennas ⁇ 3 ⁇ 4, "', 3 ⁇ 4 may be expressed as follows.
  • the received signal may be expressed as follows.
  • the number of rows and columns of the channel matrix H indicating the channel state is determined by the number of transmit and receive antennas.
  • the number of rows in the channel matrix H is equal to the number of receive antennas NR, and the number of columns is equal to the number NT of transmit antennas. That is, the channel matrix H is NRXNT matrix.
  • the rank of a matrix is defined as the minimum number of rows or columns that are independent of each other. Thus, the tank of the matrix cannot be larger than the number of rows or columns.
  • the tank (ra «(H)) of the channel matrix H is limited as follows.
  • 'Rank' represents the number of paths that can independently transmit a signal
  • 'Number of layers' represents the number of signal streams transmitted through each path.
  • a tank has the same meaning as the number of layers.
  • RSs can be classified into two types according to their purpose.
  • One is RS used for channel information acquisition, and the other is RS used for data demodulation. Since the former is an RS for allowing the terminal to acquire downlink channel information, it should be transmitted over a wide band, and even if the terminal does not receive downlink data in a specific subframe, it should be able to receive and measure the corresponding RS.
  • Such RS is also used for measurement such as handover.
  • the latter is an RS that is transmitted together with the corresponding resource when the base station transmits a downlink, and the terminal can estimate the channel by receiving the corresponding RS, and thus can demodulate the data. This RS should be transmitted in the area where data is transmitted.
  • 3GPP LTE Long Term Evolution
  • DRS dedicated RS
  • the CRS is used for measurement of channel state information, measurement for handover, and the like, and may be referred to as cell-specific RS.
  • the DRS is used for data demodulation and may be called UE-specific RS.
  • DRS is used only for data demodulation, and CRS can be used for two purposes of channel information acquisition and data demodulation.
  • the CRS is a cell-specific RS and is transmitted every subframe for a wideband.
  • the CRS may be transmitted for up to four antenna ports according to the number of transmit antennas of the base station. For example, if the number of transmitting antennas of the base station is two, CRSs for antenna ports 0 and 1 are transmitted, and for four, CRSs for antenna ports 0 to 3 are transmitted.
  • FIG. 6 shows patterns of CRS and DRS on one resource block (12 subcarriers on 14 OFDM symbols X frequencies in time in case of a normal CP) in a system in which a base station supports four transmit antennas.
  • resource elements RE denoted by 'R0', 'R1', 'R2' and 'R3' indicate positions of CRSs with respect to antenna ports indexes 1 ⁇ 2 and 3, respectively.
  • a resource element denoted as 'D' in FIG. 6 indicates a position of a DRS defined in an LTE system. Evolution of the LTE System In an advanced LTE-A system, up to eight transmit antennas may be supported in downlink. Therefore, RS for up to eight transmit antennas should also be supported.
  • the downlink RS in the LTE system is defined for up to four antenna ports only, if the base station has 4 or more and up to 8 downlink transmit antennas in the LTE ⁇ A system, the RS for these antenna ports is additionally added. Should be defined. As RS for up to eight transmit antenna ports, both RS for channel measurement and RS for data demodulation shall be considered.
  • Backward compatibility means that the existing LTE terminal supports to operate correctly in the LTE-A system. From the point of view of RS transmission, if the RS defined in the LTE standard adds RS for up to eight transmit antenna ports in the time-frequency domain transmitted in every subframe over the entire band, the RS overhead is excessive. It becomes bigger. Therefore, in designing RS for up to 8 antenna ports, consideration should be given to reducing RS overhead.
  • RS newly introduced in LTE-A system can be classified into two types. One of them is RS for channel measurement for the selection of transmission tanks, Mod at ion and Coding Schemes (MCS), and Precoding Mat Index (PMI).
  • MCS Mod at ion and Coding Schemes
  • PMI Precoding Mat Index
  • Reference signal (Channel State Informat i on RS; CSI-RS)
  • the other is a demodulation-reference signal for demodulating data transmitted through up to eight transmit antennas (DeModul at i on RS; DM RS) )to be.
  • CSI-RS for channel measurement purpose is designed for channel measurement-oriented purposes, unlike CRS in the existing LTE system used for data demodulation at the same time as channel measurement, handover, etc. There is a characteristic.
  • CSI-RS can also be used for the purpose of measuring the handover. Since the CSI-RS is transmitted only for the purpose of obtaining information about the channel state, unlike the CRS in the existing LTE system, the CSI-RS does not need to be transmitted every subframe. Therefore, in order to enjoy the overhead of the CSI-RS, the CSI-RS may be designed to be transmitted intermittently (for example, periodically) on the time axis.
  • a dedicated DM RS is transmitted to a terminal scheduled for data transmission.
  • the horse-only DM RS may be designed to be transmitted only in a resource region scheduled for the terminal, that is, in a time-frequency region in which data for the terminal is transmitted.
  • FIG. 7 is a diagram illustrating an example of a DM RS pattern defined in an LTE-A system.
  • a position of a resource element for transmitting a DM RS on one resource blocktalk (12 subcarriers on 14 OFDM symbol X frequencies in time in case of a normal CP) in which downlink data is transmitted is shown.
  • the DM RS may be transmitted for four antenna ports (antenna port indexes 8, 9 and 10) which are additionally defined in the LTE-A system.
  • DM RSs for different antenna ports can be distinguished by being located in different frequency resources (subcarriers) and / or different time resources (OFDM symbols) (ie they can be multiplexed in FDM and / or TDM schemes).
  • DM RSs for different antenna ports located on the same time-frequency resource may be distinguished from each other by orthogonal codes (i.e., may be multiplexed by the CDM scheme).
  • DM RSs for antenna ports 7 and 8 may be located in resource elements (REs) indicated as DM RS CDM group 1, which may be multiplexed by an orthogonal code.
  • the DM RSs for antenna ports 9 and 10 may be located in the resource elements indicated as DM RS group 2 in the example of FIG. 7, and they may be multiplexed by orthogonal codes.
  • FIG. 8 is a diagram illustrating examples of a CSI—RS pattern defined in an LTE-A system.
  • FIG. 8 shows the location of a resource element in which CSI—RS is transmitted on one resource block in which downlink data is transmitted (12 subcarriers on 14 0FDM symbol X frequencies in time in case of a general CP).
  • the CSI-RS pattern of one of FIGS. 8 (a) to 8 (e) may be used.
  • the CSI-RS may be transmitted for eight antenna ports (antenna port indexes 15, 16, 17, 18, 19, 20, 21, and 22) which are additionally defined in the LTE ⁇ A system.
  • CSI-RSs for different antenna ports may be distinguished by being located in different frequency resources (subcarriers) and / or different time resources (0 FDM symbols) (ie, may be multiplexed in FDM and / or TDM schemes). .
  • CSI-RSs for different antenna ports located on the same time-frequency resource may be distinguished from each other by orthogonal codes (ie, may be multiplexed by the CDM scheme).
  • CSI-RSs for antenna ports 15 and 16 may be located in resource elements (REs) indicated as CSI—RS CDM group 1, and they may be multiplexed by an orthogonal code.
  • Resource elements indicated as CDM group 2 may include CSI-RSs for antenna ports 17 and 18, which may be multiplexed by orthogonal codes.
  • CSI-RSs for antenna ports 19 and 20 may be located in resource elements indicated as CSI-RS CDM group 3, which may be multiplexed by an orthogonal code.
  • CSI-RSs for antenna ports 21 and 22 may be located in resource elements indicated as CSI-RS CDM group 4, which may be multiplexed by an orthogonal code.
  • FIG. 9 is a diagram illustrating an example of a zero power (ZP) CSI-RS pattern defined in an LTE-A system.
  • ZP CSI-RS There are two main uses of ZP CSI-RS. Firstly, it is used to improve CSI-RS performance. That is, one network mutes the CSI-RS RE of another network to improve the performance of the CSI-RS measurement of the other network and is muted so that its UE can perform rate matching correctly. RE can be informed by setting ZP CSI-RS. Secondly, it is used for interference measurement for CoMP CQI calculation. That is, some networks perform muting on the ZP CRS-RS RE, and the UE can calculate CoMP CQI by measuring interference from the ZP CSI-RS.
  • FIGS. 6 to 9 are merely exemplary and are not limited to specific RS patterns in applying various embodiments of the present invention. That is, even when RS patterns different from those of FIGS. 6 to 9 are defined and used, various embodiments of the present invention may be equally applied.
  • the FDR refers to a transmitter / end receiver technology that supports a base station and / or a terminal to transmit the uplink / downlink without splitting by dividing the uplink / downlink into frequency / time rounds.
  • FIG. 10 is a diagram illustrating an example of an interference situation in an FDR scheme.
  • UE 1 and UE 2 perform communication on an uplink / downlink using the same frequency / time resource. Accordingly, each terminal may receive a signal transmitted from another base station or terminal while transmitting. That is, as shown in the dotted line of FIG. 10, a communication environment in which its own transmission signal directly induces magnetic interference to its reception modules (or receivers) is formed.
  • the new interference or the increased interference expected by the introduction of the FDR is summarized as follows.
  • Magnetic interference means that its own transmission signal causes interference directly to its receiver as shown in FIG.
  • self-interference signals are received more strongly than their preferred signals. Therefore, it is important to eliminate them completely through interference cancellation.
  • multi-user interference refers to interference occurring between terminals. For example, it means that a signal transmitted by a terminal is received by an adjacent terminal and acts as interference.
  • half-duplexes eg, half-duplex: e.g., FDD, and TDD
  • the interference does not occur between uplink and downlink.
  • uplink and downlink share the same frequency / time resource, interference occurs between the base station transmitting data and neighboring terminals as shown in FIG. 10.
  • intercell interference refers to interference occurring between base stations.
  • a signal transmitted by one base station is received by a receiving antenna of another base station to act as interference.
  • (1) magnetic interference is the first problem to be solved in order to operate FDR due to the influence of interference occurring only in FDR.
  • 10 shows an example of FDR in a magnetic interference situation. That is, a signal transmitted from one terminal is received as it is by the receiving antenna of the same terminal to act as interference.
  • a signal acting as an interference is a hardware implementation, and can be regarded as a signal perfectly known by wire.
  • nonlinear, interfering signals of RF devices Due to the channel change between the transmitting and receiving antennas, the signal received from the antenna and the signal received via the wire are almost the same but are not equal to 1003 ⁇ 4ön Therefore, even if the signal acting as interference is perfectly known, the receiver cannot completely eliminate the interference.
  • the power of the interfering signal is significantly higher than the desired signal.
  • ADCX Analog to Digital Converter is used to convert the received signal into a digital signal.
  • the ADC measures the power of the received signal, adjusts the power level of the received signal, quantizes it, and converts it into a digital signal.
  • the signal characteristic of the desired signal is buried at the quantization level at the time of quantization, and thus it cannot be restored.
  • 11 illustrates that when quantization is performed in a situation in which an interference signal has a much larger power than a desired signal, even if the interference signal is removed, the desired signal is very distorted.
  • 12 illustrates an example in which an interference signal has a smaller power than a desired signal, and shows that a desired signal is recovered after removing the interference signal.
  • Methods for removing magnetic interference can be classified into a total of four methods depending on the location of the removal method. That
  • FIG. 13 is a block diagram showing a location where a method for eliminating magnetic interference (IC) is performed.
  • the antenna CI method is the simplest method to be implemented among all the IC methods, and may be implemented as shown in FIG. 14 to perform the antenna IC.
  • one UE can perform interference cancellation using three antennas, of which two antennas are used as transmission antennas and one antenna is used as a reception antenna.
  • the two transmitting antennas are installed at a distance of about wavelength / 2 from the receiving antenna.
  • the signal transmitted from each transmitting antenna is 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 as shown in FIG. 15 without using the distance between the antennas as shown in FIG. 14 to invert the phase of the second transmission antenna.
  • the left structure is a method of performing magnetic interference cancellation using two receiving antennas
  • the right structure is a method of removing interference using two transmitting antennas.
  • the antenna IC method is influenced by the bandwidth and the center frequency of a signal to be transmitted. That is, the smaller the bandwidth of the transmission signal, the higher the center frequency, the higher the interference cancellation performance. 16 shows interference cancellation performance according to a bandwidth and a center frequency of a signal.
  • ADC analog-digital converter
  • the biggest problem that can not be eliminated even if the interference signal is a known signal is the loss in the ADC process as described above.
  • the ADC IC method maximizes the performance of the ADC to easily remove interference.
  • the interference cancellation efficiency may be increased according to the trend of improving the ADC performance.
  • the analog IC method removes interference before the ADC by using an analog signal to remove magnetic interference.
  • the analog IC method may be performed in the RF radio frequency region, or may be performed in the IF (Intermeate Frequency) region.
  • the simplest analog IC method is to subtract the analog signal transmitted from the signal received by the receiving antenna with a phase and time delay.
  • the advantage of the analog IC method is that, unlike the antenna IC method, only one antenna for transmission and reception is required.
  • analog IC method uses an analog signal
  • the implementation is complicated and additional distortion may occur due to the characteristics of the circuit.
  • the digital IC method is a method for canceling interference after the ADC, and includes all interference cancellation methods performed in the base band region.
  • the simplest digital IC method is to subtract the transmitted digital signal from the received digital signal. Or, in the case of a terminal or a base station transmitting by using a multi-antenna, beamforming or precoding to prevent the transmission signal from being received by the receiving antenna If these methods are performed in the base band, they can be classified as digital IC methods.
  • FIG. 17 illustrates a system to which the four IC methods described above are simultaneously applied.
  • the overall interference cancellation performance in FIG. 17 is determined as the interference cancellation methods of the respective areas are combined.
  • a signal necessary for canceling end-to-end inter-link interference under the assumption that magnetic interference has been removed using the above methods and a method therefor includes.
  • FIG. 18 shows a diagram in which a base station supports multiple users in a general situation.
  • UE1 receives downlink through fl frequency band from the base station.
  • the uplink is transmitted through f3.
  • UE2 receives downlink through f2 and transmits uplink through f4.
  • the scheme is divided into frequency bands for the scheduling of respective terminals, and the dupl ex scheme of uplink and downlink is illustrated using FDD, but the mul t ipl e access and dupl ex of each terminal are illustrated.
  • the scheme can be separated using a time domain or a spat al domain.
  • FIG. 19 is a diagram in which UE1 plays a role of mobile relay (mobi le rel ay) due to a situation in which a base station cannot receive an uplink signal transmitted by a terminal when UE2 is at ce l l edge.
  • UE2 may receive downlink due to power limitation, but the base station does not receive even when uplink is transmitted.
  • UE1 is referred to as a cooperative device or a relay node
  • UE2 is referred to as a source node (device) and a destination node (device) in terms of uplink or downlink transmission, respectively. It can be called.
  • device device
  • device destination node
  • UE1 is called a relay node and UE2 is called a destination node.
  • the signal transmitted by the base station to the UE1 by using f l is called a downlink signal for UE1
  • the signal transmitted by the UE1 to the base station by using f2 is called an uplink signal of UE1.
  • the signal transmitted by UE1 to UE2 using f4 is called a downlink signal of UE1.
  • UE2 has a downlink signal received from a base station and a downlink signal received from UE1, and transmits an uplink signal to UE1 using f5.
  • FDR may be introduced.
  • 20 is a diagram showing a frequency band to be used when the FDR is applied to an existing mobile relay system.
  • the downlink signal for UE1 includes signals for UE1 and UE2, and modulates only a signal necessary for UE2 and performs downlink transmission to UE2 again.
  • decoding is performed using a downlink signal received from UE1 and a downlink signal received from a base station, and uplink transmission is transmitted to UE1.
  • UE2 performs uplink transmission to UE1 using f2, and UE1 transmits the uplink information received from UE2 and its uplink information by using f2 to the base station.
  • FIG. 21 is a diagram of transmitting and receiving uplink downlink configured with FDR between a base station and UE1.
  • FIG. 22 operates based on FIG. 21 but is a method for preventing magnetic interference of UE2.
  • FIG. 23 illustrates an example in which three frequency bands are used and a base station and a UE1 have a reciprocation and a reciprocal can be established between a UE1 and a UE2.
  • a downlink signal transmitted by a base station for UE2 is allocated to another frequency band so that UE2 can efficiently decode a signal coming to the base station.
  • the singularity in the FDR-applied mobile relay is that UE2 needs to know the scheduling grant for the downlink signal transmitted to UE1. All. There are three ways to deliver scheduling information to the source node or dest inat ion node.
  • a base station transmits downlink scheduling information transmitted by a base station to UE2 and UE1 transmits downlink scheduling information transmitted by UE1 to UE2.
  • the base station transmits scheduling information for downlink transmitted from UE1 to UE2, and UE1 transmits only data without scheduling information.
  • the base station transmits scheduling information for downlink transmitted from the base station to UE2.
  • the scheduling information for the downlink transmitted by the UE1 to the UE2 is transmitted by the UE1, and the base station transmits only broadcasting information.
  • the base station may adjust the time for transmitting the scheduling assignment message in consideration of all circumstances, there may be a difference between the timing of transmitting the scheduling grant and the timing of transmitting the data to UE2 in consideration of the implementation complexity. Because there is. Therefore, at this time, a cross subframe scheduling method may be used to enable scheduling for the time domain in the scheduling grant.
  • the scheduling grant that the base station should transmit to UE2 is for data transmitted by the base station and data transmitted by UE1. (mul ti sub frame) scheduling method may be used.
  • DCI format transmits a frequency band of a signal transmitted from a mobile relay and a base station or relay. It is desirable to include indi cat ion information on whether or not to transmit from the node.
  • the DCI may include relay bit scheduling bits of 1 bit and relay note frequency information of a plurality of bits. If the relay node scheduling bit is activated, the UE may recognize that the grant comes after a certain subframe in the relay node, and a series of preparation procedures for receiving downlink (for example, for the relay node). Synchronization acquisition, RF chain set ting, etc.).
  • the source node transmits uplink, it can be used for power control.
  • the base station transmits information on the frequency transmitted by the relay node in the above-described DCI format.
  • the base station may transmit the information through RRC ignal ing.
  • FIG. 24 illustrates a base station and a terminal that can be applied to an embodiment of the present invention.
  • the relay When the relay is included in the wireless communication system, communication is performed between the base station and the relay in the backhaul link, and communication is performed between the relay and the terminal in the access link. Therefore, the base station or the terminal illustrated in the figure may be replaced by a relay according to the situation.
  • a wireless communication system includes a base station 2410 and a terminal 2420.
  • Base station 2410 includes a processor 2413, a memory 2414, and a Radio Frequency (RF) unit 2411 2412.
  • the processor 2413 may be configured to implement the procedures and / or methods proposed in the present invention.
  • the memory 2414 is connected with the processor 2413 and stores various information related to the operation of the processor 2413.
  • the RF unit 2416 is connected with the processor 2413 and transmits and / or receives radio signals.
  • Terminal 2420 includes a processor 2423, a memory 2424, and an RF unit 2421 1422.
  • the processor 2423 may be configured to implement the procedures and / or methods proposed in the present invention.
  • the memory 2424 is connected to the processor 2423 and stores various information related to the operation of the processor 2423.
  • the RF unit 2421 2422 is connected with the processor 2423 and transmits and / or receives a radio signal.
  • the base station 2410 and / or the terminal 2420 may have a single antenna or multiple antennas.
  • the base station may be performed by its upper node. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station may be performed by a base station or network nodes other than the base station.
  • the base station may be replaced by terms such as fixed station, Node B, eNodeB (eNB), access point, and the like.
  • An embodiment according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • one embodiment of the present invention may include one or more ASICs (appl i cat ion speci f ic integrated circuits), digital signal processors (DSPs), digital signal processing devices (DSPs), programmable logic devices (PLDs).
  • ASICs application i cat ion speci f ic integrated circuits
  • DSPs digital signal processors
  • DSPs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs, FPGAs programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above.
  • the software code may be stored in the memory unit and driven by the processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the present invention can be used in a wireless communication device such as a terminal, a relay, a base station, and the like.

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

Abstract

La présente invention concerne un système d'accès sans fil prenant en charge un environnement de transmission radio en duplex intégral (FDR). Selon un mode de réalisation de la présente invention, un procédé destiné à permettre à un terminal de recevoir un signal dans un système d'accès sans fil prenant en charge des transmissions FDR consiste : à recevoir, par un terminal, en provenance d'une station de base, des informations de planification destinées à des données de relais transmises depuis la station de base au terminal par l'intermédiaire du relais d'un terminal relais ; et à recevoir des données de relais en provenance du terminal relais sur la base des informations de planification, le terminal et le terminal relais émettant et recevant des informations par l'intermédiaire d'une transmission FDR, et les informations de planification peuvent comprendre un indicateur signalant l'endroit d'où les données de relais sont transmises parmi le terminal relais et la station de base, et des informations concernant la bande de fréquence du signal transmis par le terminal relais.
PCT/KR2014/010502 2014-11-04 2014-11-04 Procédé et appareil pour recevoir un signal dans un système d'accès sans fil avec prise en charge de transmission fdr WO2016072532A1 (fr)

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