WO2012153994A2 - 복수의 안테나 포트를 이용하여 신호를 전송하는 방법 및 이를 위한 송신단 장치 - Google Patents
복수의 안테나 포트를 이용하여 신호를 전송하는 방법 및 이를 위한 송신단 장치 Download PDFInfo
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- WO2012153994A2 WO2012153994A2 PCT/KR2012/003678 KR2012003678W WO2012153994A2 WO 2012153994 A2 WO2012153994 A2 WO 2012153994A2 KR 2012003678 W KR2012003678 W KR 2012003678W WO 2012153994 A2 WO2012153994 A2 WO 2012153994A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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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 wireless communication, and more particularly, to a method for transmitting a signal using a plurality of antenna ports and a transmitting end device for the same.
- Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless communication 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 code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA).
- 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
- MCD division multiple access
- MCDMA multi-carrier frequency division multiple access
- MC-FDMA multi-carrier frequency division multiple access
- An object of the present invention is to provide a method for transmitting a signal using a plurality of antenna ports by a transmitting end supporting signal transmission through a plurality of antenna ports.
- Another object of the present invention is to provide a transmitter for transmitting signals using a plurality of antenna ports.
- a method of transmitting a signal using a plurality of antenna ports by a transmitting end supporting signal transmission through a plurality of antenna ports includes a control channel using a first resource region. Transmitting to a receiving end through a first antenna port; And transmitting a data channel to the receiving end through the plurality of antenna ports including the first antenna port using the second resource region, wherein the second resource region includes the first resource region and the time region.
- the data channel is not transmitted through at least one antenna port except for the first antenna port.
- the control channel may be an Advanced-Physical Downlink Control CHannel (A-PDCCH) or a Relay-Physical Downlink Control CHannel (R-PDCCH), and the data channel may be a Physical Downlink Shared CHannel (PDSCH).
- the transmitting end may be a base station and the receiving end may be a terminal or a repeater.
- the antenna port index of the first antenna port is 7 and the antenna port index of the at least one antenna port may include at least one of 8, 9, and 10.
- the time domain corresponding to the first resource region may be any one of a symbol unit, a slot unit, and a subframe unit.
- the frequency domain corresponding to the first resource region may be a physical resource block (PRB) unit.
- PRB physical resource block
- the method may further include transmitting, to the receiving end, indication information about a transmission scheme of the A-PDCCH or the R-PDCCH, wherein the indication information includes the PDSCH and the R-PDCCH.
- the indication information may be transmitted through an RRC signaling, a MAC layer signal, a physical layer signal (PHY layer signal), and the physical layer signal may be a specific field of a downlink control information (DCI) format or a control format indicator (CFI) field format. Can be transmitted through.
- DCI downlink control information
- CFI control format indicator
- a transmitter for transmitting signals using a plurality of antenna ports transmits a control channel to a receiver through a first antenna port using a first resource region, and the second resource region.
- the transmitter includes a transmitter for transmitting a data channel to the receiving end through a plurality of antenna ports including the first antenna port, wherein the second resource region is the same as the first resource region but has a different time domain.
- a data channel is not transmitted through at least one antenna port except for the first antenna port.
- the time domain corresponding to the first resource region may be any one of a symbol unit, a slot unit, and a subframe unit.
- the frequency domain corresponding to the first resource region may be a physical resource block (PRB) unit.
- PRB physical resource block
- the transmitter transmits indication information about a transmission scheme of the A-PDCCH or the R-PDCCH, and the indication information is spaced in a time and frequency domain where the A-PDCCH or the R-PDCCH is the same as the PDSCH. It may be information on whether the transmission is performed in a multiplexed manner.
- the control channel may be an Advanced-Physical Downlink Control CHannel (A-PDCCH) or a Relay-Physical Downlink Control CHannel (R-PDCCH), and the data channel may be a Physical Downlink Shared CHannel (PDSCH).
- A-PDCCH Advanced-Physical Downlink Control CHannel
- R-PDCCH Relay-Physical Downlink Control CHannel
- PDSCH Physical Downlink Shared CHannel
- the transmitting end may be a base station, and the receiving end may be a terminal or a repeater.
- the decoding performance of the A-PDCCH or R-PDCCH may be improved at the receiving end, and the transmitting end may increase resource utilization efficiency by transmitting the A-PDCCH or R-PDCCH in a spatial multiplexing scheme.
- FIG. 1 is a block diagram illustrating the configuration of a transmitting end 105 and a receiving end 110 in a wireless communication system 100.
- FIG. 2 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a mobile communication system.
- 3 is a diagram illustrating a structure of downlink and uplink subframes of a 3GPP LTE system as an example of a mobile communication system.
- FIG. 4 illustrates a downlink time-frequency resource grid structure used in the present invention.
- 5 is a view for explaining the conventional concept of the PDCCH and the basic concept of the A-PDCCH proposed in the present invention.
- FIG. 6 is a conceptual diagram for an R-PDCCH used for PDSCH or PUSCH transmission of a base station and repeater link.
- FIG. 7 is an exemplary diagram for describing an A-PDCCH spatially multiplexed together with a PDSCH.
- FIG. 8 is an exemplary diagram for describing an A-PDCCH not spatially multiplexed together with a PDSCH.
- a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like.
- the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
- UE user equipment
- MS mobile station
- AMS advanced mobile station
- AP Access Point
- a user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
- Information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of information transmitted or received by the terminal.
- FIG. 1 is a block diagram illustrating the configuration of a transmitting end 105 and a receiving end 110 in a wireless communication system 100.
- the wireless communication system 100 may include one or more transmitting end and / or one or more receiving end. .
- the transmitter 105 may include a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver ( 190, a symbol demodulator 195, and a receive data processor 197.
- the receiver 110 transmits (Tx) the data processor 165, the symbol modulator 175, the transmitter 175, the transmit / receive antenna 135, the processor 155, the memory 160, the receiver 140, and the symbol. It may include a demodulator 155 and a receive data processor 150.
- the transmitting and receiving antennas 130 and 135 are shown as one at the transmitting end 105 and the receiving end 110, respectively, the transmitting end 105 and the receiving end 110 are provided with a plurality of transmitting and receiving antennas. Accordingly, the transmitter 105 and the receiver 110 according to the present invention support a multiple input multiple output (MIMO) system. In addition, the transmitter 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.
- SU-MIMO single user-MIMO
- MU-MIMO multi-user-MIMO
- the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
- the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
- the symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter 125.
- each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero.
- pilot symbols may be sent continuously.
- the pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.
- Transmitter 125 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency upconverts) the analog signals to provide a wireless channel. Generates a downlink signal suitable for transmission via the transmission antenna 130, the transmission antenna 130 transmits the generated downlink signal to the receiving end.
- the receiving antenna 135 receives the downlink signal from the transmitting end and provides the received signal to the receiver 140.
- Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
- the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
- the symbol demodulator 145 also receives a frequency response estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
- the processing by the symbol demodulator 145 and the receiving data processor 150 is complementary to the processing by the symbol modulator 120 and the transmitting data processor 115 at the transmitting end 105, respectively.
- the receiving end 110 is on the uplink, and the transmit data processor 165 processes the traffic data to provide data symbols.
- the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
- the transmitter 175 receives and processes a stream of symbols to generate an uplink signal.
- the transmit antenna 135 transmits the generated uplink signal to the transmitter 105.
- an uplink signal from the receiving end 110 is received through the receiving antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
- the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
- the received data processor 197 processes the data symbol estimates to recover the traffic data sent from the receiver 110.
- the processors 155 and 180 of the receiving end 110 and the transmitting end 105 respectively instruct (eg, control, adjust, manage, etc.) the operation at the receiving end 110 and the transmitting end 105, respectively.
- Respective processors 155 and 180 may be connected to memory units 160 and 185 that store program codes and data.
- the memory 160, 185 is coupled to the processor 180 to store the operating system, applications, and general files.
- the processors 155 and 180 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like.
- the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs Field programmable gate arrays
- the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
- the firmware or software configured to be may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processors 155 and 180.
- the layers of the air interface protocol between the receiving end and the transmitting end between the wireless communication system are based on the lower three layers of the open system interconnection (OSI) model, which is well known in the communication system. ), And the third layer L3.
- the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
- a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
- the receiving end and the transmitting end may exchange RRC messages through the wireless communication network and the RRC layer.
- the transmitting end may be a base station receiving end, a terminal or a repeater, and vice versa.
- FIG. 2 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a mobile communication system.
- one radio frame has a length of 10 ms (327200 Ts) and consists of 10 equally sized subframes.
- Each subframe has a length of 1 ms and consists of two slots.
- Each slot has a length of 0.5 ms (15360 Ts).
- a 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 resource block includes 12 subcarriers x 7 (6) OFDM symbols or SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbols.
- Transmission time interval which is a unit time for transmitting data, may be determined in units of one or more subframes.
- the structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe, the number of OFDM symbols or SC-FDMA symbols included in the slot may be variously changed. have.
- 3 is a diagram illustrating a structure of downlink and uplink subframes of a 3GPP LTE system as an example of a mobile communication system.
- one downlink subframe includes two slots in the time domain. Up to three OFDM symbols of the first slot in the downlink subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated.
- PDSCH Physical Downlink Shared Channel
- Downlink control channels used in 3GPP LTE systems include a PCFICH (Physical Control Format Indicator Channel), PDCCH (Physical Downlink Control Channel), PHICH (Physical Hybrid-ARQ Indicator Channel).
- the PCFICH transmitted in the first OFDM symbol of the subframe carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
- Control information transmitted through the PDCCH is called downlink control information (DCI).
- DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups.
- the PHICH carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.
- ACK Acknowledgement
- NACK Not-Acknowledgement
- the base station sets a resource allocation and transmission format of the PDSCH (also referred to as a DL grant), a resource allocation information of the PUSCH (also referred to as a UL grant) through a PDCCH, a set of transmission power control commands for an arbitrary terminal and individual terminals in a group. And activation of Voice over Internet Protocol (VoIP).
- a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
- the PDCCH consists of an aggregation of one or several consecutive Control Channel Elements (CCEs).
- the PDCCH composed of one or several consecutive CCEs may be transmitted through the control region after subblock interleaving.
- CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
- the CCE corresponds to a plurality of resource element groups.
- the format of the PDCCH and the number of possible bits of the PDCCH are determined by the correlation between the number of CCEs and the coding rate provided by the CCEs.
- DCI Downlink control information
- DCI format 0 indicates uplink resource allocation information
- DCI formats 1 to 2 indicate downlink resource allocation information
- DCI formats 3 and 3A indicate uplink transmit power control (TPC) commands for arbitrary UE groups. .
- the base station may transmit scheduling assignment information and other control information to the terminal through the PDCCH.
- the PDCCH may be transmitted in one aggregation or a plurality of control channel elements (CCEs).
- CCEs control channel elements
- One CCE includes nine Resource Element Groups (REGs).
- the number of RBGs not allocated to the PCFICH (Physical Control Format Indicator CHhannel) or PHICH (Physical Hybrid Automatic Repeat Request Indicator Channel) is N REG .
- the available CCEs in the system are from 0 to N CCE -1 (where to be).
- the PDCCH supports multiple formats as shown in Table 2 below.
- the base station may determine the PDCCH format according to how many areas, such as control information, to send.
- the UE may reduce overhead by reading control information in units of CCE.
- the repeater can also read control information and the like in R-CCE units or CCE units.
- a resource element RE
- R-CCE relay-control channel element
- an uplink subframe may be divided into a control region and a data region in the frequency domain.
- the control region is allocated to a physical uplink control channel (PUCCH) that carries uplink control information.
- the data area is allocated to a Physical Uplink Shared CHannel (PUSCH) for carrying user data.
- PUCCH Physical Uplink Shared CHannel
- PUSCH Physical Uplink Shared CHannel
- PUCCH for one UE is allocated to an RB pair in one subframe. RBs belonging to the RB pair occupy different subcarriers in each of two slots. The RB pair assigned to the PUCCH is frequency hopped at the slot boundary.
- FIG. 4 illustrates a downlink time-frequency resource grid structure used in the present invention.
- OFDM orthogonal frequency division multiplexing
- Represents the number of resource blocks (RBs) in downlink Represents the number of subcarriers constituting one RB, Denotes the number of OFDM symbols in one downlink slot.
- the number of OFDM symbols included in one slot may vary depending on the length of a cyclic prefix (CP) and the spacing of subcarriers.
- CP cyclic prefix
- one resource grid may be defined per one antenna port.
- Each element in the resource grid for each antenna port is called a resource element (RE) and is uniquely identified by an index pair (k, l) in the slot.
- k is the index in the frequency domain
- l is the index in the time domain and k is 0, ...
- Has a value of -1 and l is 0, ..., It has any one of -1.
- the resource block shown in FIG. 4 is used to describe a mapping relationship between certain physical channels and resource elements.
- the RB may be divided into a physical resource block (PRB) and a virtual resource block (VRB).
- PRB physical resource block
- VRB virtual resource block
- the one PRB is a time domain Contiguous OFDM symbols and frequency domain It is defined as two consecutive subcarriers. here and May be a predetermined value. E.g and Can be given as Table 3 below. So one PRB ⁇ It consists of four resource elements.
- One PRB may correspond to one slot in the time domain and 180 kHz in the frequency domain, but is not limited thereto.
- PRB is at 0 in the frequency domain It has a value up to -1.
- the relation between the PRB number n PRB in the frequency domain and the resource element (k, l) in one slot satisfies.
- the size of the VRB is equal to the size of the PRB.
- the VRB may be defined by being divided into a localized VRB (LVRB) and a distributed VRB (DVRB). For each type of VRB, a pair of VRBs in two slots in one subframe are assigned together a single VRB number n VRBs .
- the VRB may have the same size as the PRB.
- Two types of VRBs are defined, the first type being a localized VRB (LVRB) and the second type being a distributed VRB (DVRB).
- LVRB localized VRB
- DVRB distributed VRB
- a pair of VRBs are allocated over two slots of one subframe with a single VRB index (hereinafter may also be referred to as a VRB number).
- a VRB number belonging to the first slot of the two slots constituting one subframe VRBs from 0 each
- the index of any one of -1 and belonging to the second one of the two slots VRBs likewise start with 0
- the index of any one of -1 is allocated.
- the radio frame structure, the downlink subframe and the uplink subframe, and the downlink time-frequency resource lattice structure described in FIGS. 2 to 4 may also be applied between the base station and the repeater.
- the base station determines the PDCCH format according to the downlink control information (DCI) to be sent to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information.
- the CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH.
- RNTI Radio Network Temporary Identifier
- the PDCCH for a specific terminal is a unique identifier of the terminal
- a unique identifier of the repeater for example C-RNTI (Cell-RNTI) may be masked to the CRC.
- C-RNTI Cell-RNTI
- a paging indication identifier for example, P-RNTI (P-RNTI) may be masked to the CRC.
- SI-RNTI system information-RNTI
- a random access-RNTI may be masked to the CRC to indicate a random access response that is a response to transmission of the random access preamble of the terminal and the repeater.
- Table 4 shows examples of identifiers masked on the PDCCH and / or the R-PDCCH.
- PDCCH and R-PDCCH carry control information for a specific terminal and a specific repeater, respectively. If another RNTI is used, PDCCH and R-PDCCH are received for all or a plurality of terminals and repeaters in a cell, respectively. Carries common control information.
- the base station performs channel coding on the DCI to which the CRC is added to generate coded data.
- the base station performs rate matching according to the number of CCEs allocated to the PDCCH and R-PDCCH formats.
- the base station then modulates the encoded data to generate modulation symbols.
- the base station maps modulation symbols to physical resource elements.
- a spatial multiplexing is performed on a control channel (eg, variously named as Advanced PDCCH (A-PDCCH), Enhanced PDCCH, ePDCCH, etc.), which is an improved PDCCH channel, which is a control channel in an existing 3GPP LTE system.
- A-PDCCH Advanced PDCCH
- Enhanced PDCCH Enhanced PDCCH
- ePDCCH Enhanced PDCCH
- the proposed technique of the spatial multiplexing method applied to such an improved control channel may be equally applied to a relay-physical downlink control channel (R-PDCCH) in a 3GPP LTE-A system.
- R-PDCCH relay-physical downlink control channel
- the R-PDCCH refers to a backhaul physical downlink control channel for relay transmission from a base station to a repeater, and is a control channel for a repeater.
- 5 is a view for explaining the conventional concept of the PDCCH and the basic concept of the A-PDCCH proposed in the present invention.
- a PDCCH region 510 is allocated to one subframe, and downlink control information (for example, DL grant and UL grant) transmitted in the PDCCH region 510 is As for the PDSCH 520 in the same subframe, the processor 155 of the UE may obtain data by decoding the PDSCH region 520 based on downlink control information transmitted through the PDCCH 510.
- downlink control information for example, DL grant and UL grant
- the A-PDCCH 540 may be allocated to a PDSCH region, which is a region in which data is transmitted in an existing LTE system.
- the A-PDCCH 540 transmits downlink scheduling assignment information for PDSCH 1 550 and uplink scheduling grant for PUSCH (Physical Uplink Shared CHannel).
- PUSCH Physical Uplink Shared CHannel
- the PDCCH 530 may be transmitted based on a UE-specific reference signal.
- the PDCCH 530 may be received at the same time as the A-PDCCH 540 is received. Only the UE may decode the PDSCH 1 550 with the help of the PDCCH 530. .
- the A-PDCCH 540 is a frequency division multiplexing (FDM) scheme with the PDSCH 1 550 and the PDSCH 2 560 in the data region of the existing LTE system. Can be multiplexed and transmitted.
- FDM frequency division multiplexing
- the base station may apply precoding to the DM DeModulation Reference Signal (DM RS) based A-PDCCH 540 and transmit it.
- the terminal may decode the A-PDCCH based on the DM RS.
- DM RS DM DeModulation Reference Signal
- the reference signal in the LTE-A system will be briefly described.
- the LTE terminal must work well in the LTE-A system, and the system must support this. From the point of view of the reference signal transmission, it is necessary to additionally define a reference signal for up to eight transmit antenna ports in the time-frequency domain in which the CRS defined in LTE is transmitted every subframe over the entire band.
- the reference signal patterns for up to eight transmit antennas are added to all bands in every subframe in the same manner as in the CRS of the existing LTE system, the overhead due to the reference signal transmission becomes excessively large.
- the reference signal newly designed in the LTE-A system is divided into two categories, a channel for selecting a modulation and coding scheme (MCS) and a precoding matrix index (PMI).
- MCS modulation and coding scheme
- PMI precoding matrix index
- Reference signal for measurement (CSI-RS: Channel State Information-RS, hereinafter referred to as 'CSI-RS') (also referred to as Channel State Indication-RS) and data demodulation transmitted through eight transmit antennas.
- CSI-RS Channel State Information-RS
- 'CSI-RS' Reference signal
- DeModulation RS hereinafter referred to as 'DM RS'.
- CSI-RS for the purpose of channel measurement is characterized in that it is designed for channel measurement-oriented purposes, unlike the conventional CRS is used for data demodulation at the same time as the channel measurement, handover, and the like.
- the CSI-RS can also be used for the purpose of measuring handover and the like. Since the CSI-RS is transmitted only for obtaining the channel state information, unlike the CRS, the CSI-RS does not need to be transmitted every subframe. Accordingly, in order to reduce overhead due to CSI-RS transmission, the base station intermittently transmits the CSI-RS on the time axis, and transmits the dedicated DM RS to the UE scheduled in the corresponding time-frequency domain for data demodulation. do. That is, the DM-RS of a specific terminal is transmitted only in a scheduled region, that is, a time-frequency region capable of receiving data.
- FIG. 6 is a conceptual diagram for an R-PDCCH used for PDSCH or PUSCH transmission of a base station and repeater link.
- the R-PDCCH 610 does not need to be configured in slot units in the existing LTE system.
- the R-PDCCH 610 transmits DL Scheduling Assignment information for PDSCH 1 630 and UL scheduling grant for Physical Uplink Shared CHannel (PUSCH).
- the repeater may also decode the R-PDCCH 610 using a DM RS.
- FIG. 7 is an exemplary diagram for describing an A-PDCCH spatially multiplexed together with a PDSCH.
- the A-PDCCH (or R-PDCCH) may be transmitted in the form of spatial multiplexing or multiple layer transmission as necessary.
- the transmitting end (which may be a base station in case of transmitting A-PDCCH and a repeater in case of transmitting R-PDCCH) may be a specific resource region 710 (for example, the first slot of the k-th RB (RB #k)).
- A-PDCCH and PDSCH can be spatially multiplexed using different antenna ports at the same time.
- the base station may transmit the A-PDCCH to the antenna port 7, and at the same time, the PDSCH may transmit through the antenna ports 8, 9, and 10 in the specific resource region 710.
- the A-PDCCH is transmitted through the n-th slot (slot #n), but this is only an example and may be transmitted over slot #n as well as slot #n. It may be desirable for the base station to transmit the A-PDCCH over two slots (#n, # n + 1).
- FIG. 7 four layer transmissions are performed on a specific RB (or PRB) pair (slot #n, slot # n + 1) and A is performed on two consecutive PRBs (RB #k, RB # k + 1) in frequency.
- An example of SM transmission of a PDCCH and a PDSCH is shown.
- the transmitting end of the antenna ports # 8, # 9, # 10 despite the A-PDCCH or R-PDCCH is transmitted to the antenna port # 7, RB #k This is the case where PDSCH transmission is performed to RB #k.
- the transmitter transmits the A-PDCCH and the PDSCH simultaneously by applying the spatial multiplexing scheme, but there is an advantage of transmitting more information in the limited resource region, but interference between antenna ports or layers occurs. Therefore, to achieve the ultimate high resource utilization efficiency, there is a burden of using a special purpose receiver (interference cancellation) that can sufficiently remove unwanted inter-layer interference components.
- a special purpose receiver interference cancellation
- the performance of the A-PDCCH may be somewhat degraded due to an interference problem or a power distribution problem caused by simultaneously transmitting the A-PDCCH and the PDSCH by applying a spatial multiplexing scheme.
- FIG. 8 is an exemplary diagram for describing an A-PDCCH not spatially multiplexed together with a PDSCH.
- a transmitting end eg, a base station or a repeater
- the resource utilization efficiency may be slightly reduced, the A-PDCCH decoding performance at the receiving end (eg, the terminal) may be greatly improved.
- FIG. 8 illustrates an A-PDCCH or an R-PDCCH not using a spatial multiplexing (SM) scheme. While the transmitting end transmits the A-PDCCH using the antenna port # 7 in a specific resource region 810 (eg, slot #n, RB #k), through the antenna ports # 8, # 9, and # 10 Is a scheme in which the PDSCH is not transmitted in the resource region 810.
- a specific resource region 810 eg, slot #n, RB #k
- the transmitting end uses the PDSCH as the antenna ports # 8, # 9, and # 10.
- A-PDCCH or R-PDCCH can be simultaneously transmitted. Since the A-PDCCH is not allocated in the slot # n + 1, the transmitting end has a plurality of antenna ports (antenna ports # 7, # 8, # 9, and # 10) in each of the resource region 830 and the resource region 840.
- the PDSCH may be transmitted to the receiver through a plurality of antenna ports.
- the A-PDCCH or the R-PDCCH is allocated in units of slots.
- the present invention is not limited thereto, and the A-PDCCH or R-PDCCH is a plurality of symbols among the remaining symbols except for the symbols in which the PDCCH is allocated in the subframe. Can be sent over the network.
- A-PDCCH transmission methods proposed above may be applied alone, but both methods may be applied to a terminal or a repeater together. That is, it may be more preferable to use a spatial multiplexing A-PDCCH or more preferably to use a non-spatial multiplexing (Non-SM) A-PDCCH according to a situation experienced by the system and the terminal / relay.
- Non-SM non-spatial multiplexing
- a MAC layer signal or a physical layer signal may be used.
- a specific field (bit) of the DCI format may be used to indicate which method is being used and transmitted.
- the base station may instruct the repeater that a non-SM R-PDCCH is used in case of “0” and an SM R-PDCCH is used in case of “1” using the LVRB / DVRB bit.
- the LVRB / DVRB indication bit is an example and may use other fields or other reserved states. Or, it may be transmitted using a Control Format Indicator (CFI) field.
- CFI Control Format Indicator
- the decoding performance of the A-PDCCH or R-PDCCH may be improved at the receiving end, and the transmitting end may utilize the resource by transmitting the A-PDCCH or R-PDCCH in a spatial multiplexing scheme.
- the transmitting end may utilize the resource by transmitting the A-PDCCH or R-PDCCH in a spatial multiplexing scheme.
- the antenna port described herein may also be referred to as a port, a layer, a rank, and the like, and the index of the antenna port shown in the drawings of the present invention is not limited thereto and may be changed by re-numbering. It may be.
- a method for transmitting a signal using a plurality of antenna ports and a transmitter device for the same are industrially available in various communication systems such as 3GPP LTE, LTE-A, IEEE 802, and the like.
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Abstract
Description
Claims (15)
- 복수의 안테나 포트를 통한 신호 전송을 지원하는 송신단이 복수의 안테나 포트를 이용하여 신호를 전송하는 방법에 있어서,제 1 자원영역을 이용하여 제어 채널을 제 1 안테나 포트를 통해 수신단으로 전송하는 단계; 및상기 제 2 자원영역을 이용하여 데이터 채널을 상기 제 1 안테나 포트를 포함한 복수의 안테나 포트를 통해 상기 수신단으로 전송하는 단계를 포함하되,상기 제 2 자원영역은 상기 제 1 자원영역과 시간 영역은 동일하되 주파수 영역이 다르고,상기 제 1 자원영역에 해당하는 시간 및 주파수 영역에서는 상기 제 1 안테나 포트를 제외한 나머지의 적어도 하나의 안테나 포트를 통해서는 데이터 채널을 전송되지 않는 것을 특징으로 하는, 송신단의 신호 전송 방법.
- 제 1항에 있어서,상기 제어 채널은 A-PDCCH(Advanced-Physical Downlink Control CHannel) 또는 R-PDCCH(Relay-Physical Downlink Control CHannel)이고, 상기 데이터 채널은 PDSCH(Physical Downlink Shared CHannel)인 것을 특징으로 하는, 송신단의 신호 전송 방법.
- 제 2항에 있어서,상기 송신단은 기지국이고, 상기 수신단은 단말 또는 중계기인 것을 특징으로 하는, 송신단의 신호 전송 방법.
- 제 1항에 있어서,상기 제 1 안테나 포트의 안테나 포트 인덱스는 7이고, 상기 나머지 적어도 하나의 안테나 포트의 안테나 포트 인덱스는 8, 9, 10 중 적어도 어느 하나를 포함하는, 송신단의 신호 전송 방법.
- 제 1항에 있어서,상기 제 1 자원영역에 해당하는 시간영역은 심볼 단위, 슬롯 단위 및 서브프레임 단위 중 어느 하나인 것을 특징으로 하는, 송신단의 신호 전송 방법.
- 제 5항에 있어서,상기 제 1 자원영역에 해당하는 주파수 영역은 물리자원블록(Physical Resoruce Block, PRB) 단위인 것을 특징으로 하는, 송신단의 신호 전송 방법.
- 제 2항에 있어서,상기 A-PDCCH 또는 상기 R-PDCCH의 전송 방식에 관한 지시 정보를 상기 수신단으로 전송하는 단계를 더 포함하되,상기 지시 정보는 상기 A-PDCCH 또는 상기 R-PDCCH가 PDSCH와 동일한 시간 및 주파수 영역에서 공간 다중화 방식으로 전송되는지 여부에 관한 정보인, 송신단의 신호 전송 방법.
- 제 7항에 있어서,상기 지시 정보는 RRC 시그널링, MAC 레이어 시그널, 물리 레이어 시그널(PHY layer signal)을 통해 전송되는 것을 특징으로 하는, 송신단의 신호 전송 방법.
- 제 8항에 있어서,상기 물리 레이어 시그널은 DCI(DownLink Control Information) 포맷의 특정 필드 또는 CFI(Control Format Indicator) 필드 포맷을 통해 전송되는, 송신단의 신호 전송 방법.
- 복수의 안테나 포트를 이용하여 신호를 전송하는 송신단에 있어서,제 1 자원영역을 이용하여 제어 채널을 제 1 안테나 포트를 통해 수신단으로 전송하고, 상기 제 2 자원영역을 이용하여 데이터 채널을 상기 제 1 안테나 포트를 포함한 복수의 안테나 포트를 통해 상기 수신단으로 전송하는 송신기를 포함하되,상기 제 2 자원영역은 상기 제 1 자원영역과 시간 영역은 동일하되 주파수 영역이 다르고,상기 제 1 자원영역에 해당하는 시간 및 주파수 영역에서는 상기 제 1 안테나 포트를 제외한 나머지의 적어도 하나의 안테나 포트를 통해서는 데이터 채널을 전송되지 않는 것을 특징으로 하는, 송신단.
- 제 10항에 있어서,상기 제 1 자원영역에 해당하는 시간영역은 심볼 단위, 슬롯 단위 및 서브프레임 단위 중 어느 하나인 것을 특징으로 하는, 송신단.
- 제 11항에 있어서,상기 제 1 자원영역에 해당하는 주파수 영역은 물리자원블록(Physical Resoruce Block, PRB) 단위인 것을 특징으로 하는, 송신단.
- 제 10항에 있어서,상기 송신기는 상기 수신단으로 상기 A-PDCCH 또는 상기 R-PDCCH의 전송 방식에 관한 지시 정보를 전송하며,상기 지시 정보는 상기 A-PDCCH 또는 상기 R-PDCCH가 PDSCH와 동일한 시간 및 주파수 영역에서 공간 다중화 방식으로 전송되는지 여부에 관한 정보인, 송신단.
- 제 10항에 있어서,상기 제어 채널은 A-PDCCH(Advanced-Physical Downlink Control CHannel) 또는 R-PDCCH(Relay-Physical Downlink Control CHannel)이고, 상기 데이터 채널은 PDSCH(Physical Downlink Shared CHannel)인 것을 특징으로 하는, 송신단.
- 제 14항에 있어서,상기 송신단은 기지국이고, 상기 수신단은 단말 또는 중계기인 것을 특징으로 하는, 송신단.
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US14/116,741 US9401791B2 (en) | 2011-05-10 | 2012-05-10 | Method for transmitting signal using plurality of antenna ports and transmission end apparatus for same |
KR1020137029724A KR102040614B1 (ko) | 2011-05-10 | 2012-05-10 | 복수의 안테나 포트를 이용하여 신호를 전송하는 방법 및 이를 위한 송신단 장치 |
US15/190,742 US20160308654A1 (en) | 2011-05-10 | 2016-06-23 | Method for transmitting signal using plurality of antenna ports and transmission end apparatus for same |
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US15/190,742 Continuation US20160308654A1 (en) | 2011-05-10 | 2016-06-23 | Method for transmitting signal using plurality of antenna ports and transmission end apparatus for same |
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2016
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Also Published As
Publication number | Publication date |
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WO2012153994A3 (ko) | 2013-03-21 |
KR20140027983A (ko) | 2014-03-07 |
US20140119275A1 (en) | 2014-05-01 |
US20160308654A1 (en) | 2016-10-20 |
KR102040614B1 (ko) | 2019-11-05 |
US9401791B2 (en) | 2016-07-26 |
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