WO2013109036A1 - 무선 통신 시스템에서 복조참조신호 전송 방법 및 장치 - Google Patents
무선 통신 시스템에서 복조참조신호 전송 방법 및 장치 Download PDFInfo
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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
- H04L5/0058—Allocation criteria
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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
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
Definitions
- the following description relates to a wireless communication system, and more particularly, to an enhanced physical downlink channel (E-PDCCH) and a method and apparatus for transmitting a modulation reference signal (DMRS) for the same.
- E-PDCCH enhanced physical downlink channel
- DMRS modulation reference signal
- 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
- embodiments related to the transmission of a demodulation reference signal in particular, the positions of resource elements to which the demodulation reference signal is mapped are disclosed.
- a first technical aspect of the present invention is a method of transmitting a demodulation reference signal by a base station in a wireless communication system, the method comprising transmitting a reference signal sequence mapped to a resource element on a carrier, wherein the reference signal sequence is mapped
- the location of the resource element is differently set according to at least one or more of the type of the carrier, whether or not the cell-specific reference signal transmission, multiplexing scheme, the resource block location containing the resource element, demodulation reference signal transmission method.
- a second technical aspect of the present invention is a base station apparatus in a wireless communication system, comprising: a transmission module; And a processor, wherein the processor transmits a reference signal sequence mapped to a resource element on a carrier, wherein the location of the resource element to which the reference signal sequence is mapped is a type of the carrier, whether a cell specific reference signal is transmitted, or multiplexing.
- the base station apparatus is set differently according to at least one or more of the resource block location containing the resource element.
- the first to second technical aspects may include all / parts of the following matters.
- the resource element to which the reference signal sequence is mapped may exist on OFDM symbols 1, 2, and 5, 6 of the second slot.
- the resource element to which the reference signal sequence is mapped is on the OFDM symbols 1, 2, 2, 3 of the first slot May exist in
- the resource element to which the reference signal sequence is mapped is on the 0, 1, 5, 6 OFDM symbol of the first slot. May exist in
- the resource element to which the reference signal sequence is mapped is on the 0, 1, 4, 5 OFDM symbol of the first slot May exist in
- the physical downlink common channel transmitted on the subframe including the resource element may be demodulated using the reference signal sequence.
- the cell specific reference signal may be transmitted through an antenna port 0.
- the resource element to which the reference signal sequence is mapped is 1, 2, 2, 3 of the first slot. May exist on the OFDM symbol.
- the resource element to which the reference signal sequence is mapped is 0, 1, or 2nd slot of the first slot. May exist on 5, 6 OFDM symbols.
- the location of the resource element to which the reference signal sequence is mapped may be differently set according to the location of the resource block including the resource element, and may be signaled to a terminal to which the setting is applied.
- the resource element to which the RS sequence is mapped may exist on OFDM symbols 1, 2 and 4, 5 of the second slot.
- the resource element to which the reference signal sequence is mapped may exist on the 0, 1 OFDM symbol of the first slot and the 0, 1 OFDM symbol of the second slot.
- Downlink control information may be transmitted only on the enhanced physical downlink control channel (EPDCCH) on the carrier.
- EDCCH enhanced physical downlink control channel
- the carrier may be a secondary component carrier.
- the performance can be improved through interpolation in channel estimation based on demodulation reference signals.
- 1 is a diagram illustrating a structure of a radio frame.
- FIG. 2 is a diagram illustrating a resource grid in a downlink slot.
- 3 is a diagram illustrating a structure of a downlink subframe.
- FIG. 4 is a diagram illustrating a structure of an uplink subframe.
- 5 is a diagram for describing carrier aggregation.
- 6 is a diagram for explaining cross carrier scheduling.
- FIG. 7 is a diagram for describing a cell specific reference signal.
- FIG. 8 is a diagram for explaining a demodulation reference signal.
- FIG. 9 is a diagram illustrating various types of reference signals together with a PDCCH.
- 15 is a diagram illustrating a configuration of a transmitting and receiving device.
- each component or feature may be considered to be optional unless otherwise stated.
- 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 order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
- the base station has a meaning as a terminal node of the network that directly communicates with the terminal.
- the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
- 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).
- the term “terminal” may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), a subscriber station (SS), and the like.
- 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, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present 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 access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced
- 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). For clarity, the following description focuses on 3GPP LTE and 3GPP LTE-A systems, but the technical spirit of the present invention is not limited thereto.
- a structure of a 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 OFDM 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 time division duplex (TDD).
- the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
- a time taken for one subframe to be transmitted is called a TTI (transmission time interval).
- one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
- One slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
- RBs resource blocks
- a resource block (RB) is a resource allocation unit and may include a plurality of consecutive subcarriers in one slot.
- the number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
- CP has an extended CP (normal CP) and a normal CP (normal CP).
- normal CP when an OFDM symbol is configured by a normal CP, the number of OFDM symbols included in one slot may be seven.
- the OFDM symbol is configured by the extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the normal CP.
- the number of OFDM symbols included in one slot may be six.
- an extended CP may be used to further reduce intersymbol interference.
- one subframe includes 14 OFDM symbols.
- the first two or three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
- PDCCH physical downlink control channel
- PDSCH physical downlink shared channel
- Type 2 radio frames consist of two half frames, each of which has five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS downlink pilot time slot
- GP guard period
- UpPTS uplink pilot time slot
- One subframe consists of two slots.
- DwPTS is used for initial cell search, synchronization, or channel estimation at the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- one subframe consists of two slots regardless of the radio frame type.
- the structure of the 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 and the number of symbols included in the slot may be variously changed.
- FIG. 2 is a diagram illustrating a resource grid in a downlink slot.
- One downlink slot includes seven OFDM symbols in the time domain and one resource block (RB) is shown to include 12 subcarriers in the frequency domain, but the present invention is not limited thereto.
- one slot includes 7 OFDM symbols, but in the case of an extended CP, one slot may include 6 OFDM symbols.
- Each element on the resource grid is called a resource element.
- One resource block includes 12 ⁇ 7 resource elements.
- the number of NDLs of resource blocks included in a downlink slot depends on a downlink transmission bandwidth.
- the structure of the uplink slot may be the same as the structure of the downlink slot.
- FIG. 3 is a diagram illustrating a structure of a downlink subframe.
- Up to three OFDM symbols at the front of the first slot in one subframe correspond to a control region to which a control channel is allocated.
- the remaining OFDM symbols correspond to data regions to which a physical downlink shared channel (PDSCH) is allocated.
- Downlink control channels used in the 3GPP LTE system include, for example, a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical HARQ Indicator Channel.
- PCFICH Physical Hybrid automatic 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 referred to as 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 is a resource allocation and transmission format of the downlink shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information of the paging channel (PCH), system information on the DL-SCH, on the PDSCH Resource allocation of upper layer control messages such as random access responses transmitted to the network, a set of transmit power control commands for individual terminals in an arbitrary terminal group, transmission power control information, and activation of voice over IP (VoIP) And the like.
- a plurality of PDCCHs may be transmitted in the control region.
- the terminal may monitor the plurality of PDCCHs.
- the PDCCH is transmitted in an aggregation of one or more consecutive Control Channel Elements (CCEs).
- CCEs Control Channel Elements
- the CCE is a logical allocation unit used to provide a PDCCH at a coding rate based on the state of a radio channel.
- the CCE corresponds to a plurality of resource element groups.
- the format of the PDCCH and the number of available bits are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
- the base station determines the PDCCH format according to the DCI transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
- the CRC is masked with an identifier called a Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH.
- RNTI Radio Network Temporary Identifier
- the cell-RNTI (C-RNTI) identifier of the terminal may be masked to the CRC.
- a paging indicator identifier P-RNTI
- the PDCCH is for system information (more specifically, system information block (SIB))
- SI-RNTI system information RNTI
- RA-RNTI Random Access-RNTI
- RA-RNTI may be masked to the CRC to indicate a random access response that is a response to the transmission of the random access preamble of the terminal.
- 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 to the control region.
- a physical uplink shared channel (PUSCH) including user data is allocated.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- one UE does not simultaneously transmit a PUCCH and a PUSCH.
- PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. This is called a resource block pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- a cell may be understood as a combination of downlink resources and uplink resources.
- the uplink resource is not an essential element, and thus, the cell may be composed of only the downlink resource or the downlink resource and the uplink resource.
- the downlink resource may be referred to as a downlink component carrier (DL CC) and the uplink resource may be referred to as an uplink component carrier (UL CC).
- the DL CC and the UL CC may be represented by a carrier frequency, and the carrier frequency means a center frequency in a corresponding cell.
- a cell may be classified into a primary cell (PCell) operating at a primary frequency and a secondary cell (SCell) operating at a secondary frequency.
- PCell and SCell may be collectively referred to as a serving cell.
- the terminal may perform an initial connection establishment (initial connection establishment) process, or the cell indicated in the connection reset process or handover process may be a PCell. That is, the PCell may be understood as a cell that is the center of control in a carrier aggregation environment to be described later.
- the UE may receive and transmit a PUCCH in its PCell.
- the SCell is configurable after the Radio Resource Control (RRC) connection is established and can be used to provide additional radio resources.
- RRC Radio Resource Control
- the remaining serving cells except the PCell may be viewed as SCells.
- the UE In the RRC_CONNECTED state, but the UE is not configured carrier aggregation or does not support carrier aggregation, there is only one serving cell consisting of a PCell.
- the network may configure one or more SCells in addition to the PCell initially configured in the connection establishment process.
- Carrier aggregation is a technology introduced to use a wider band in order to meet the demand for high speed data rates.
- Carrier aggregation may be defined as an aggregation of two or more component carriers (CCs) having different carrier frequencies.
- FIG. 5 (a) shows a subframe when one CC is used in the existing LTE system
- FIG. 5 (b) shows the subframe when carrier aggregation is used.
- FIG. 5B three CCs of 20 MHz are used to support a total bandwidth of 60 MHz.
- each CC may be continuous on the frequency axis or may be non-continuous.
- the terminal may simultaneously receive and monitor downlink data through a plurality of DL CCs.
- the linkage between each DL CC and UL CC may be indicated by system information.
- the DL CC / UL CC link may be fixed in the system or configured semi-statically.
- the frequency band that a specific UE can monitor / receive may be limited to M ( ⁇ N) CCs.
- Various parameters for carrier aggregation may be set in a cell-specific, UE group-specific, or UE-specific manner.
- Cross carrier scheduling includes, for example, including all downlink scheduling allocation information of another DL CC (Secondary CC, SCC) in a control region of one DL CC (Primary CC, PCC) of a plurality of serving cells; Alternatively, this means that all of uplink scheduling grant information for a plurality of UL CCs linked with the DL CC is included in a control region of one of the plurality of serving cells.
- SCC secondary CC
- PCC Primary CC
- the CIF may be included or not included in the DCI format transmitted through the PDCCH, and when included, it indicates that the cross carrier scheduling is applied.
- cross carrier scheduling is not applied, downlink scheduling allocation information is valid on a DL CC through which current downlink scheduling allocation information is transmitted.
- the uplink scheduling grant is also valid for one UL CC linked with the DL CC through which the downlink scheduling assignment information is transmitted.
- the CIF indicates a CC related to downlink scheduling allocation information transmitted through a PDCCH in one DL CC.
- downlink allocation information about DL CC B and DL CC C that is, information about PDSCH resources, is transmitted through a PDCCH in a control region on DL CC A.
- the UE monitors the DL CC A to know the resource region of the PDSCH and the corresponding CC through the CIF.
- CIF is included or not included in the PDCCH may be set semi-statically and may be UE-specific activated by higher layer signaling.
- the PDCCH on a particular DL CC may allocate PDSCH resources on that same DL CC and allocate PUSCH resources on a UL CC linked to the particular DL CC.
- the same coding scheme, CCE-based resource mapping, DCI format, and the like as the existing PDCCH structure may be applied.
- the PDCCH on a specific DL CC may allocate PDSCH / PUSCH resources on one DL / UL CC indicated by the CIF among a plurality of merged CCs.
- the CIF may be additionally defined in the existing PDCCH DCI format, may be defined as a fixed 3-bit field, or the CIF position may be fixed regardless of the DCI format size.
- the same coding scheme, CCE-based resource mapping, DCI format, and the like as the existing PDCCH structure may be applied.
- the base station can allocate a set of DL CC to monitor the PDCCH. Accordingly, the burden of blind decoding of the terminal can be reduced.
- the PDCCH monitoring CC set is a part of the total merged DL CCs and the UE may perform detection / decoding of the PDCCH only in the corresponding CC set. That is, in order to schedule PDSCH / PUSCH for the UE, the base station may transmit the PDCCH only on the PDCCH monitoring CC set.
- the PDCCH monitoring DL CC set may be configured as UE-specific or UE group-specific or cell-specific. For example, when three DL CCs are merged as in the example of FIG.
- DL CC A may be set to the PDCCH monitoring DL CC.
- the PDCCH on each DL CC may only schedule PDSCH in DL CC A.
- the PDCCH on DL CC A may schedule not only DL CC A but also PDSCH on another DL CC.
- DL CC A is set to PDCCH monitoring CC, PDSCH is not transmitted to DL CC B and DL CC C.
- the transmitted packet is transmitted through a wireless channel
- signal distortion may occur during transmission.
- the distortion In order to correctly receive the distorted signal at the receiving end, the distortion must be corrected in the received signal using the channel information.
- a method of transmitting the signal known to both the transmitting side and the receiving side, and finding the channel information with the distortion degree when the signal is received through the channel is mainly used.
- the signal is called a pilot signal or a reference signal.
- the reference signal may be divided into an uplink reference signal and a downlink reference signal.
- an uplink reference signal as an uplink reference signal,
- DM-RS Demodulation-Reference Signal
- SRS sounding reference signal
- DM-RS Demodulation-Reference Signal
- CSI-RS Channel State Information Reference Signal
- MBSFN Multimedia Broadcast Single Frequency Network
- Reference signals can be classified into two types according to their purpose. There is a reference signal for obtaining channel information and a reference signal used for data demodulation. In the former, since the UE can acquire channel information on the downlink, it should be transmitted over a wide band, and even if the UE does not receive downlink data in a specific subframe, it should receive the reference signal. It is also used in situations such as handover.
- the latter is a reference signal transmitted together with a corresponding resource when the base station transmits a downlink, and the terminal can demodulate data by performing channel measurement by receiving the reference signal. This reference signal should be transmitted in the area where data is transmitted.
- the CRS is used for two purposes of channel information acquisition and data demodulation, and the UE-specific reference signal is used only for data demodulation.
- the CRS is transmitted every subframe for the broadband, and reference signals for up to four antenna ports are transmitted according to the number of transmit antennas of the base station.
- CRSs for antenna ports 0 and 1 are transmitted, and for four antennas, CRSs for antenna ports 0 to 3 are transmitted.
- FIG. 7 is a diagram illustrating a pattern in which CRSs and DRSs defined in an existing 3GPP LTE system (eg, Release-8) are mapped onto a downlink resource block pair (RB pair).
- a downlink resource block pair as a unit to which a reference signal is mapped may be expressed in units of 12 subcarriers in one subframe ⁇ frequency in time. That is, one resource block pair has 14 OFDM symbol lengths in the case of a normal CP in FIG. 7 (a) and 12 OFDM symbol lengths in the case of an extended CP (in FIG. 7 (b)).
- FIG. 7 shows a position of a reference signal on a resource block pair in a system in which a base station supports four transmit antennas.
- resource elements RE denoted by '0', '1', '2' and '3' indicate positions of CRSs for antenna port indexes 0, 1, 2, and 3, respectively.
- the resource element denoted as 'D' in FIG. 7 indicates the position of the DMRS transmitted through the antenna port 5.
- DMRS Demodulation Reference Signal
- DMRS is a reference signal defined by the UE for channel estimation for PDSCH.
- DMRS may be used in transmission modes 7, 8 and 9.
- DMRS was initially defined for single layer transmission of antenna port 5, but has since been extended to spatial multiplexing of up to eight layers.
- DMRS is transmitted only for one specific terminal, as can be seen from its other name, UE-specific reference signal, and therefore, may be transmitted only in an RB through which a PDSCH for the specific UE is transmitted.
- DMRS For up to eight layers is as follows.
- DMRS generates a reference-signal sequence generated according to Equation 5 ) Is a complex-valued modulation symbol, May be mapped and transmitted.
- FIG. 8 illustrates that the DMRS is mapped to a resource grid on a subframe in the case of a normal CP according to Equation 2, Tena port 7-10 is shown.
- the reference signal sequence is orthogonal as shown in Table 1 according to the antenna port when mapping to a complex modulation symbol. Is applied.
- FIG. 9 is a diagram illustrating possible regions of the CRS, DMRS, and PDCCH described above in one PRB pair.
- the PDCCH is exemplarily transmitted on the OFDM symbol 1001 of the first slot 0-2 of the subframe.
- DMRS in the existing LTE / LTE-A exists on the first slot 5, 6 and the second slot 5, 6 OFDM symbols of the subframe in consideration of the transmission region of the PDCCH. .
- the channel estimation method for resources between RS and RS in time in the normal CP case of FIG.
- interpolation 9 corresponds to OFDM symbols 0 to 4 in the second slot
- the channel estimation method for the located resource may be referred to as an extrapolation.
- the existing DMRS configuration is applied. Rather than using it as it is, the DMRS setting may be changed to enable channel estimation through interpolation that performs better than extrapolation.
- the present invention proposes a reference signal structure that can improve channel estimation performance of a corresponding subframe when there is no control signal in the existing subframe structure, that is, when no PDCCH is transmitted.
- the position of the RE to which the above-described DMRS (more precisely, the aforementioned RS sequence) is mapped is the RE to which the DMRS is mapped in the existing LTE / LTE-A system according to the carrier type, CRS transmission, and multiplexing scheme. Unlike the position of can be set.
- orthogonal sequences of DMRS may be used as they are.
- the description of the drawings related to the embodiment of the present invention will be mainly focused on the case of normal CP.
- the carrier type may be distinguished according to whether the PDCCH is a carrier wave transmitted.
- the SCC Secondary Component Carrier or extension carrier, additional carrier
- the position of the RE to which the DMRS is mapped may be changed.
- the position of the RE to which the DMRS is mapped may be changed.
- this may also be the case for a new carrier type (new carrier type) currently under discussion.
- the CRS may correspond to the CRS transmitted through the antenna port 0 (1), among the above-mentioned CRSs.
- a tracking reference signal which may have a form similar to the CRS transmitted from the antenna port 0 or is transmitted to a location where the CRS of the antenna port 0 is transmitted, may also correspond to this.
- the tracking reference signal is mapped to the position where the CRS of antenna port 0 is transmitted on the subframe, but the transmission period may be different from the CRS (for example, 5 ms) and may not be used for PDSCH demodulation. have.
- the location change (or shift) of the RE may be set differently according to the RB / physical resource block pair including the RE to which the DMRS is transmitted.
- FIG. 10 the position of the RE to which the DMRSs are mapped when the PDCCH is not transmitted is illustrated.
- DMRSs mapped on the first slot 5, 6 OFDM symbols and the second slot 5, 6 OFDM symbols of the existing subframe, in particular DMRS is mapped in the first slot It can be seen that the position of the RE is changed / shifted to the 0 and 1 OFDM symbols. Since it is assumed that the PDCCH is not transmitted, the channel estimation performance due to interpolation can be improved by shifting the position of the RE where the DMRS is mapped to the OFDM symbol to which the conventional PDCCH is transmitted.
- CRS transmission for timing tuning, fine tuning of frequency offset, etc.
- CRS transmitted through antenna port 0 Or consider the TRS that can be transmitted in the same RE. If the CRS is transmitted and the antenna port of the transmitted CRS is based on an eNB Tx antenna, that is, when a plurality of antenna ports are included, the existing DMRS configuration may be used for DMRS-based channel estimation. .
- the DMRS when the CRS is transmitted without transmitting the PDCCH, the DMRS may be mapped to an RE existing on the first and second OFDM symbols of the first slot of the subframe.
- the REs to which the DMRSs are mapped in the existing first slot may be shifted left by 4 spaces in units of OFDM symbols. In such a case, while ensuring the transmission of the CRS, it is possible to improve the channel estimation performance due to interpolation.
- FIG. 11 is a diagram illustrating a location of an RE to which DMRSs are mapped when the system information is further considered in the case of FIG. 10.
- a DMRS-based PDSCH is transmitted in a corresponding subframe to a terminal in which an area for transmitting a physical broadcasting channel (PBCH), a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and an allocated resource overlap each other. Cannot be performed. This is because PBCH, PSS / SSS, etc.
- PBCH physical broadcasting channel
- PSS primary synchronization signal
- SSS secondary synchronization signal
- the RE to which the DMRS is mapped is a subframe. 1 may be present in the first slot 0, 1 OFDM symbol and the second slot 4, 5 OFDM symbol.
- the DMRS may not be mapped on the last OFDM symbol of the second slot. In this case, however, the number of terminals that can be multiplexed may be reduced.
- the RE to which the DMRS is mapped is the first slot 1, the 2 OFDM symbols, and the second slot of the subframe. May exist in the 2, 3 OFDM symbol.
- the DMRS may not be mapped on the last OFDM symbol of the second slot.
- the DMRS mapping scheme of FIGS. 11 (b) and (d) may be implemented using a method of not transmitting the last element of a spreading code having a spreading factor of 4.
- the location of the RE to which the DMRSs are mapped may be set as shown in FIG. 12.
- the REs to which the DMRSs are mapped are symmetrically configured to exist in the first slot # 1, # 2 OFDM symbol, the second slot # 4, and # 5 OFDM symbol of the subframe. Can be.
- the REs to which the DMRSs are mapped may be configured to exist in the first slot 0, the 1st OFDM symbol, the second slot 0, and the 1st OFDM symbol of the subframe. This is to improve channel estimation by receiving all of one slots because the existing DMRS is located at the end of the slot, so that channel estimation can be performed in a short time.
- a configuration as shown in FIG. This may be interpreted as a setting in which the existing DMRS configuration is evenly distributed in the subframe.
- DMRS patterns as illustrated in FIG. 10 to FIG. 13 may be selected in consideration of channel conditions or additional signals (eg, CRS, CSI-RS, Paging, PSS, SSS, PBCH) in the corresponding subframe, This may be indicated to the UE through higher layer signaling such as RRC signaling. In addition, whether or not in which subframe the DMRS pattern is used may be signaled.
- additional signals eg, CRS, CSI-RS, Paging, PSS, SSS, PBCH
- the position change (or shift) of the RE to which the DMRS is mapped as described above may be set differently according to the RB / physical resource block pair including the RE to which the DMRS is transmitted.
- the existing DMRS pattern and the proposed DMRS pattern may be set in units of frequency units in a frequency domain.
- FIG. 14 An example of this is shown in FIG. 14.
- CRS is transmitted only to 6 RB (fA) of one of the entire system frequency bands for the purpose of timing tracking.
- one of the entire system frequency bands may use a DMRS pattern / setting as described in FIGS. 10 (b), 11 (c), (d), and 13 (b) in 6RB (fA).
- the DMRS configuration related to the case where the CRS is transmitted without transmitting the PDCCH among the above descriptions may be used.
- the present invention is not necessarily limited thereto, and the DMRS setting in the existing LTE / LTE-A system may be used as it is.
- a DMRS pattern / setting can be used separately from the DMRS pattern / setting used in 6RB (fA) in the middle.
- the DMRS pattern / setting described in FIG. 10A may correspond to this.
- the present invention is not limited thereto, and the above-described various DMRS patterns / settings may correspond to each other, or the DMRS configuration of the existing LTE / LTE-A system may be used as it is.
- DMRS patterns / settings are individually applied on the frequency axis, it is necessary to signal to the terminal which DMRS patterns / settings the corresponding frequency band uses.
- a signaling method RRC signaling or the like may be used, and its individual application may be signaled dynamically, semi-statically, and statically as needed.
- the DMRS pattern / setting in the LTE / LTE-A system and one of the above-described DMRS pattern setting may be promised in advance, and the DMRS pattern setting described above may be set to be used only when there is additional signaling. .
- the UE may be signaled to perform CRS-based channel estimation.
- the DMRS pattern / configuration is applied to the UE (UE specific), it may be signaled to the specific terminal.
- UE specific UE specific
- the above-described DMRS pattern / setting may be applied only to the specific frequency band.
- a DMRS pattern / setting may be applied individually.
- a specific frequency band (fA, fC) is assigned to a specific terminal, considering the case where the CRS is transmitted in the above-described DMRS pattern / configuration to the frequency band fA, the frequency band fC is used in fA You can use a different one from the DMRS pattern / setting.
- different DMRS patterns / settings are applied within a specific frequency band allocated to a specific UE, the same may be applied.
- DMRS setting / pattern considering the CRS may be consistently applied to the another frequency band.
- 15 is a diagram showing the configuration of a transmission point apparatus and a terminal apparatus according to an embodiment of the present invention.
- the transmission point apparatus 1510 may include a reception module 1511, a transmission module 1512, a processor 1513, a memory 1514, and a plurality of antennas 1515.
- the plurality of antennas 1515 refers to a transmission point apparatus that supports MIMO transmission and reception.
- the receiving module 1511 may receive various signals, data, and information on the uplink from the terminal.
- the transmission module 1512 may transmit various signals, data, and information on downlink to the terminal.
- the processor 1513 may control the overall operation of the transmission point apparatus 1510.
- the processor 1513 of the transmission point apparatus 1510 may process matters necessary for the above-described measurement report, handover, random access, and the like.
- the processor 1513 of the transmission point apparatus 1510 performs a function of processing the information received by the transmission point apparatus 1510, information to be transmitted to the outside, and the memory 1514 stores the computed information. It may be stored for a predetermined time and may be replaced by a component such as a buffer (not shown).
- the terminal device 1520 may include a reception module 1521, a transmission module 1522, a processor 1523, a memory 1524, and a plurality of antennas 1525.
- the plurality of antennas 1525 means a terminal device that supports MIMO transmission and reception.
- the receiving module 1521 may receive various signals, data, and information on downlink from the base station.
- the transmission module 1522 may transmit various signals, data, and information on the uplink to the base station.
- the processor 1523 may control operations of the entire terminal device 1520.
- the processor 1523 of the terminal device 1520 may process necessary items in the aforementioned measurement report, handover, random access, and the like.
- the processor 1523 of the terminal device 1520 performs a function of processing information received by the terminal device 1520, information to be transmitted to the outside, and the memory 1524 stores the processed information and the like for a predetermined time. And may be replaced by a component such as a buffer (not shown).
- the description of the transmission point apparatus 1510 may be equally applicable to a relay apparatus as a downlink transmission entity or an uplink reception entity, and the description of the terminal device 1520 is a downlink. The same may be applied to a relay apparatus as a receiving subject or an uplink transmitting subject.
- Embodiments of the present invention described above may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
- a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- Embodiments of the present invention as described above may be applied to various mobile communication systems.
Abstract
Description
Claims (15)
- 무선 통신 시스템에서 기지국이 복조참조신호를 전송하는 방법에 있어서,반송파 상의 자원요소에 매핑된 참조신호 시퀀스를 전송하는 단계;를 포함하며,상기 참조신호 시퀀스가 매핑되는 자원요소의 위치는, 상기 반송파의 타입, 셀특정 참조신호 전송 여부, 다중화 방식, 상기 자원요소가 포함된 자원블록 위치 중 적어도 하나 이상에 따라 각각 다르게 설정되는, 복조참조신호 전송방법.
- 제1항에 있어서,상기 반송파 상에서 물리하향링크제어채널이 전송되지 않는 경우,상기 참조신호 시퀀스가 매핑되는 자원요소는, 첫 번째 슬롯의 1, 2번, 두 번째 슬롯의 5, 6번 OFDM 심볼상에 존재하는, 복조참조신호 전송방법.
- 제2항에 있어서,상기 기지국의 동기신호 전송이 두 번째 슬롯의 마지막 OFDM 심볼을 사용하는 경우,상기 참조신호 시퀀스가 매핑되는 자원요소는, 첫 번째 슬롯의 1, 2번, 두 번째 슬롯의 2, 3번 OFDM 심볼상에 존재하는, 복조참조신호 전송방법.
- 제1항에 있어서,상기 반송파 상에서 물리하향링크제어채널과 셀특정참조신호가 전송되지 않는 경우,상기 참조신호 시퀀스가 매핑되는 자원요소는, 첫 번째 슬롯의 0, 1번, 두 번째 슬롯의 5, 6번 OFDM 심볼상에 존재하는, 복조참조신호 전송방법.
- 제4항에 있어서,상기 기지국의 동기신호 전송이 두 번째 슬롯의 마지막 OFDM 심볼을 사용하는 경우,상기 참조신호 시퀀스가 매핑되는 자원요소는, 첫 번째 슬롯의 0, 1번, 두 번째 슬롯의 4, 5번 OFDM 심볼상에 존재하는, 복조참조신호 전송방법.
- 제2항 내지 제5항 중 어느 한 항에 있어서,상기 자원요소가 포함되는 서브프레임 상에서 전송되는 물리하향링크공용채널은, 상기 참조신호 시퀀스를 이용하여 복조되는, 복조참조신호 전송방법.
- 제1항 내지 제5항 중 어느 한 항에 있어서,상기 셀특정 참조신호는 0번 안테나 포트를 통해 전송되는 것인, 복조참조신호 전송방법.
- 제1항에 있어서,상기 자원요소가 포함된 자원블록이 전체 주파수 대역의 가운데 6 자원블록에 해당되는 경우,상기 참조신호 시퀀스가 매핑되는 자원요소는, 첫 번째 슬롯의 1, 2번, 두 번째 슬롯의 2, 3번 OFDM 심볼상에 존재하는, 복조참조신호 전송방법.
- 제8항에 있어서,상기 자원요소가 포함된 자원블록이 전체 주파수 대역의 가운데 6 자원블록을 제외한 자원블록에 해당되는 경우,상기 참조신호 시퀀스가 매핑되는 자원요소는, 첫 번째 슬롯의 0, 1번, 두 번째 슬롯의 5, 6번 OFDM 심볼상에 존재하는, 복조참조신호 전송방법.
- 제8항에 있어서,상기 참조신호 시퀀스가 매핑되는 자원요소의 위치가 상기 자원요소가 포함된 자원블록 위치에 따라 각각 다르게 설정됨은, 상기 설정이 적용되는 단말에게 시그널링되는, 복조참조신호 전송방법.
- 제1항에 있어서,상기 참조신호 시퀀스가 매핑되는 자원요소는, 첫 번째 슬롯의 1, 2번, 두 번째 슬롯의 4, 5번 OFDM 심볼상에 존재하는, 복조참조신호 전송방법.
- 제1항에 있어서,상기 참조신호 시퀀스가 매핑되는 자원요소는, 첫 번째 슬롯의 0, 1번, 두 번째 슬롯의 0, 1번 OFDM 심볼상에 존재하는, 복조참조신호 전송방법.
- 제1항에 있어서,상기 반송파 상에서는 하향링크제어정보가 EPDCCH(Enhanced Physical Downlink Control Channel)를 통해서만 전송되는, 복조참조신호 전송방법.
- 제1항에 있어서,상기 반송파는 세컨더리 구성 반송파(Secondary Component Carrier)인, 복조참조신호 전송방법.
- 무선 통신 시스템에서 기지국 장치에 있어서,전송 모듈; 및프로세서를 포함하고,상기 프로세서는, 반송파 상의 자원요소에 매핑된 참조신호 시퀀스를 전송하되, 상기 참조신호 시퀀스가 매핑되는 자원요소의 위치는, 상기 반송파의 타입, 셀특정 참조신호 전송 여부, 다중화 방식, 상기 자원요소가 포함된 자원블록 위치 중 적어도 하나 이상에 따라 각각 다르게 설정되는, 기지국 장치.
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US14/372,187 US20150003356A1 (en) | 2012-01-16 | 2013-01-16 | Demodulation-reference-signal transmission method and device in a wireless communication system |
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KR101990479B1 (ko) | 2014-08-08 | 2019-06-18 | 후아웨이 테크놀러지 컴퍼니 리미티드 | 빠른 적응적 송신 및 수신을 이용하여 통신하기 위한 디바이스, 네트워크, 및 방법 |
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CN113439412A (zh) * | 2019-02-15 | 2021-09-24 | Lg电子株式会社 | 在无线通信系统中发送用于上行链路数据的解调参考信号的方法及用于该方法的设备 |
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KR20140132336A (ko) | 2014-11-17 |
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