WO2012111937A2 - Procédé et dispositif pour attribuer des signaux de référence, et procédé et dispositif pour recevoir les signaux de référence avec lesdits procédé et dispositif dans un système de communication sans fil - Google Patents

Procédé et dispositif pour attribuer des signaux de référence, et procédé et dispositif pour recevoir les signaux de référence avec lesdits procédé et dispositif dans un système de communication sans fil Download PDF

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WO2012111937A2
WO2012111937A2 PCT/KR2012/000946 KR2012000946W WO2012111937A2 WO 2012111937 A2 WO2012111937 A2 WO 2012111937A2 KR 2012000946 W KR2012000946 W KR 2012000946W WO 2012111937 A2 WO2012111937 A2 WO 2012111937A2
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csi
prs
reference signal
subframe
transmission
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WO2012111937A3 (fr
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윤성준
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Pantech Co Ltd
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Pantech Co Ltd
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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
    • 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
    • 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) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • 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—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Definitions

  • the present invention relates to a wireless communication system, and in particular, a positioning reference signal (hereinafter, referred to as a 'PRS' or a 'position reference signal') or a channel state information-reference signal in a wireless communication system. (Hereinafter, referred to as 'CSI-RS'), and a reference signal receiving apparatus and method using the same.
  • a positioning reference signal hereinafter, referred to as a 'PRS' or a 'position reference signal'
  • 'CSI-RS' channel state information-reference signal
  • each cell or base station transmits a Positioning Reference Signal (hereinafter, also referred to as a 'PRS') to the UE in order to measure a position of a user equipment (hereinafter referred to as a 'terminal' or a UE). Then, the UE receives the location reference signal from each base station transmitted at a specific time and measures the location.
  • a 'PRS' Positioning Reference Signal
  • LTE Long Term Evolution
  • PRS position reference signal
  • next-generation communication technology such as LTE-A (LTE-Advanced), which is currently under development, can support up to eight antennas in the downlink, and accordingly, in order to identify channel information during downlink transmission,
  • LTE-A LTE-Advanced
  • CRS channel reference signal
  • the channel state information for up to eight antennas is identified by newly defining the channel state information-reference signal CSI-RS as described above. Done.
  • a communication system using up to 8 x 8 multiple input multiple output antennas (MIMO) in both transmitting and receiving terminals has been discussed, and an antenna port or antenna through which a user terminal receives or transmits a signal.
  • MIMO multiple input multiple output antennas
  • a different CSI-RS should be transmitted for each layer, and the user terminal receives the CSI-RS to estimate the channel state.
  • PRSs and CSI-RSs are defined and used for different functions, but since they are allocated and transmitted in the time-frequency resource space of a subframe having a certain offset every specific period, two reference signals are allocated on the same resource space. In this case, since accurate reference signals are not available, there is a risk of deterioration of performance of position measurement (in case of PRS) or channel state estimation (in case of CSI-RS).
  • the PRS and the CSI-RS when the PRS and the CSI-RS are allocated and transmitted in the resource space, the PRS or the CSI-RS enables the two RSs not to overlap as much as possible, thereby improving the accuracy of the UE positioning or the performance of the channel estimation.
  • An object of the present invention is to provide an apparatus and method for transmitting and receiving PRS or CSI-RS in a wireless communication system.
  • the present invention is to provide a technique for configuring a subframe to which two reference signals are transmitted in the allocation of PRS or CSI-RS in a wireless communication system so as not to overlap as much as possible.
  • resource elements (hereinafter, referred to as' RE's) of a time-frequency resource space to which two reference signals are allocated are not duplicated as much as possible. It is intended to provide a technique that is configured to avoid.
  • the present invention is configured so that in the resource allocation of the PRS or CSI-RS in the wireless communication system, the subframes to which the two reference signals will be transmitted are not overlapped as much as possible, but the subframes to which the two reference signals are transmitted are duplicated.
  • it is intended to provide a technique for configuring an RE in a time-frequency resource space to which two reference signals are allocated in a overlapping subframe so as not to overlap as much as possible.
  • the second reference signal configuration information for one or more cells is allocated when the first reference signal, which is a reference target signal of PRS and CSI-RS, is allocated to the time-frequency resource space and transmitted. And identifying first reference signal configuration information such that the first reference signal transmission subframe is determined so as not to overlap with a subframe configured for transmission of the second reference signal.
  • the method of allocating PRS and CSI-RS checking the PRS configuration information and the CSI-RS configuration information and confirming whether the PRS and CSI-RS are allocated to the same subframe. And allocating the CSI-RS only to the n CSI-RS patterns which are part of the available N CSI-RS patterns when the PRS and the CSI-RS should be allocated to the same subframe.
  • Another embodiment of the present invention is an apparatus for allocating a first reference signal, which is a reference target signal of PRS and CSI-RS, to a time-frequency resource space in a wireless communication system, and generating a first reference signal sequence.
  • a generator a second reference signal configuration information checking unit for identifying the second reference signal configuration information for one or more cells, and first reference signal configuration information for allocating the first reference signal sequence to a time-frequency resource region
  • a reference signal allocation apparatus including a first reference signal resource allocator configured to determine first reference signal configuration information so as to determine the first reference signal configuration information so as not to overlap with the identified second reference signal configuration information in at least one unit of a subframe and an RE; to provide.
  • Another embodiment of the present invention is a method for receiving a reference signal in a wireless communication system, in which a terminal is generated by resource allocation so that duplication of a PRS sequence and a CSI-RS sequence is avoided as much as possible in units of at least one of a subframe and an RE from a base station.
  • Receiving an OFDM signal demodulating the received OFDM signal, extracting the PRS sequence and the CSI-RS sequence, and estimating location information and channel state information from the extracted PRS sequence and CSI-RS sequence It provides a reference signal receiving method comprising a.
  • Another embodiment of the present invention is an apparatus for receiving a reference signal in a wireless communication system
  • a reception processor for receiving an OFDM signal generated by resource allocation from a cell or a base station such that a subframe unit or RE unit PRS sequence and a CSI-RS sequence are avoided as much as possible, and demodulating the OFDM signal to demodulate the PRS sequence and the CSI-RS sequence;
  • a reference signal receiver includes a sequence extractor for extracting a sequence and a measurer for estimating position information and channel state information using the extracted PRS sequence and CSI-RS sequence.
  • FIG. 1 is a diagram schematically illustrating a wireless communication system to which an embodiment of the present invention is applied.
  • FIG. 2 illustrates a general subframe and time slot structure of transmission data that can be applied to an embodiment of the present invention.
  • FIG. 3 illustrates a PRS signal pattern in a wireless communication system.
  • FIG. 5 illustrates a CSI-RS signal pattern in a wireless communication system.
  • FIG. 6 is a flowchart of a CSI-RS allocation method according to the first embodiment of the present invention.
  • FIG. 7 illustrates an example of a CSI-RS subframe configuration according to the CSI-RS resource allocation method of the embodiment of FIG. 6, in which FIG. 7A is in a synchronous reception state of a terminal, and FIG. 7B is in an asynchronous reception state of a terminal. Corresponding.
  • FIG. 8 is a flowchart of a PRS allocation method in the first embodiment of the present invention.
  • FIG. 9 illustrates an example of a configuration of a PRS subframe using the PRS resource allocation method of the embodiment of FIG. 8, in which FIG. 9A corresponds to a first scheme and FIG. 9B corresponds to a second scheme.
  • FIG. 10 is a flowchart of a reference signal allocation method according to a second embodiment of the present invention.
  • FIG 11 shows an example of a reference signal allocation pattern according to the second embodiment.
  • FIG. 12 is a flowchart illustrating a reference signal allocation method according to an embodiment in which some of the first embodiment and the second embodiment are combined.
  • FIG. 13 is a block diagram of an apparatus for allocating a reference signal according to an embodiment of the present invention.
  • FIG. 14 is a functional block diagram of a reference signal transmission apparatus to which the present embodiments are applied.
  • 15 is a flowchart illustrating a method for receiving a reference signal according to an embodiment of the present invention.
  • 16 is a diagram showing the structure of a reference signal receiving apparatus according to the present embodiment.
  • FIG. 1 illustrates a wireless communication system to which embodiments of the present invention are applied.
  • a wireless communication system includes a terminal 10 (UE) and a base station 20 (base station (BS)).
  • UE terminal 10
  • BS base station
  • the terminal 10 is a comprehensive concept of a user terminal in wireless communication, and includes a mobile station (MS), a user terminal (UT), an SS (MS) in GSM as well as a UE in WCDMA, LTE, and HSPA. It should be interpreted as a concept that includes both a subscriber station and a wireless device.
  • the base station 20 or cell generally refers to a station communicating with the terminal 10, and includes a Node-B, an evolved Node-B, an eNodeB, a Base Transceiver System, An access point, a relay node, a remote radio head (hereinafter referred to as "RRH”) may be called in other terms.
  • a base station or a cell should be interpreted in a comprehensive sense including all areas covered by a base station controller (BSC) in a CDMA, a NodeB of a WCDMA, etc., or a device or hardware / software for managing the same.
  • BSC base station controller
  • Megacell, macrocell, microcell, picocell, femtocell, relay node, RRH and the like can be used in the same concept.
  • the terminal 10 and the base station 20 are two transmitting and receiving entities used to implement the technology or technical idea described in the present specification and are used in a comprehensive sense and are not limited by the terms or words specifically referred to. .
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-FDMA
  • OFDM-TDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme transmitted using different times, or use a frequency division duplex (FDD) scheme transmitted using different frequencies, or both.
  • TDD time division duplex
  • FDD frequency division duplex
  • a hybrid division duplex (HDD) system which is a complex form of the system, may be used.
  • the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
  • a wireless communication system to which an embodiment of the present invention is applied may support uplink and / or downlink HARQ, and may use a channel quality indicator (CQI) for link adaptation.
  • CQI channel quality indicator
  • multiple access schemes for downlink and uplink transmission may be different from each other. For example, downlink uses Orthogonal Frequency Division Multiple Access (OFDMA), and uplink uses Single Carrier-Frequency Division Multiple Access (SC-FDMA). ) Is the same as can be used.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • the layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) model, which are well known in communication systems.
  • the physical layer may be divided into a second layer (L2) and a third layer (L3), and the physical layer belonging to the first layer provides an information transfer service using a physical channel.
  • one radio frame may include 10 subframes, and one subframe may include two slots.
  • the basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis.
  • One slot may include a plurality of OFDM symbols in the region of the time axis and a plurality of subcarriers (or subcarriers) in the region of the frequency axis.
  • a subframe consists of two time slots, each time slot having seven symbols (Extended cyclic prefix; Extended cyclic prefix; when using a normal cyclic prefix (Normal CP) in the time domain); 6 or 3 symbols) and 180 kHz bandwidth in the frequency domain (in general, one subcarrier has 15 kHz bandwidth, so 180 kHz bandwidth corresponds to a total of 12 subcarriers). It may include corresponding subcarriers.
  • a time-frequency domain defined as one slot on the time axis and a bandwidth of 180 kHz on the frequency axis may be referred to as a resource block or a resource block (hereinafter referred to as a resource block or an RB). It is not limited to this.
  • FIG. 2 is a diagram illustrating various subframe and time slot structures of transmission data that may be applied to an embodiment of the present invention.
  • the transmission time of a frame is divided into TTIs 201 (transmission time intervals) of 1.0 ms duration.
  • TTI and subframe may be used in the same meaning, and the frame is 10 ms long and includes 10 TTIs.
  • the TTI is a basic transmission unit, and one TTI includes two time slots 202 of the same length, each time slot having a duration of 0.5 ms.
  • the time-slot includes a plurality of long blocks (hereinafter referred to as 'LB') 203 corresponding to each symbol.
  • LBs are separated by cyclic prefix 204.
  • the cyclic prefix includes a normal cyclic prefix (Normal CP) and an extended cyclic prefix (Extended CP) according to the length thereof.
  • the plurality of LBs may include seven in one time-slot.
  • the plurality of LBs may include six or three in one time-slot. Dogs are included.
  • one TTI or subframe may contain 14 LB symbols when using normal cyclic prefixes, typically 12 LB symbols when using extended cyclic prefixes or 6 LB symbols in special cases. It may include, but the present specification is not limited to such a frame, subframe or time-slot structure.
  • FIG. 2C of FIG. 2 illustrates a configuration of one resource block (RB) 220 during one subframe or TTI 201 according to an embodiment of the present invention, wherein each TTI or subframe has a normal cyclic prefix in the time domain. For example, 14 symbols (axis) or extended cyclic prefix is divided into 12 (or 6) symbols (axis) 210. Each symbol (axis) may carry one OFDM symbol.
  • RB resource block
  • the total system bandwidth of 20 MHz is divided or divided into subcarriers 205 having different frequencies.
  • it consists of one slot in the time domain and subcarriers corresponding to a bandwidth of 180 kHz in the frequency domain (typically 12 subcarriers with a bandwidth of 15 kHz per subcarrier).
  • An area can be called a resource block.
  • a bandwidth of 10 MHz within 1 TTI may include two RBs in the time domain and 50 RBs in the frequency domain.
  • Each grid space constituting the resource block RB may be referred to as a resource element (hereinafter, referred to as a RE).
  • a normal cyclic prefix is used and the frequency bandwidth of one subcarrier is 15 kHz.
  • There may be a total of 14 (symbols) ⁇ 12 (subcarriers) 168 REs in each resource region.
  • a cell-specific reference signal and a MBSFN reference signal may be included in a multicast / broadcast over single frequency network reference signal; And a UE-specific reference signal or a DM-RS (Demodulation Reference Signal).
  • WCDMA wideband code division multiple access
  • These positioning methods are largely 1) the cell coverage-based positioning method, 2) Observed Time Difference of Arrival (OTDOA) method, and 3) network-assisted GPS. It is based on three methods of assisted GPS methods. Each method is complementary rather than competitive, and is used appropriately for each different purpose.
  • the OTDOA method is based on measuring a location by measuring relative arrival times of reference signals or pilots from different base stations or cells, and the reference signal used at this time is a location reference signal or a PRS. .
  • the UE Since the location calculation uses triangulation, the UE must receive the corresponding reference signal from at least three different base stations or cells.
  • the WCDMA standard uses IDL Periods in Downlink (IPDL) technology, during which the UE is located on the same frequency where the current UE is located. Even if the reference signal from the serving cell is strong, it should be able to receive the reference signal from the neighbor cell.
  • IPDL IDL Periods in Downlink
  • the LTE (Long Term Evolution) system developed from 3GPP series WCDMA is based on Orthogonal Frequency Division Multiplexing (OFDM), unlike the asynchronous CDMA (Code Division Multiple Access) method of WCDMA.
  • OFDM Orthogonal Frequency Division Multiplexing
  • a new LTE system is considering a method for measuring position based on the OTDOA method, such as the positioning using the OTDOA method, and for this, the MBSFN subframe (Multicast Broadcast Single Frequency Network subframe) and the normal In each subframe structure of one or both of the subframes, a data region is emptied at regular intervals, and a reference signal for positioning, ie, PRS, is sent to the vacant region. This is under consideration.
  • the new next-generation communication method based on OFDM it is based on the OTDOA method in the existing WCDMA, but in the new resource allocation structure due to the change of the communication base such as the multiplexing method and the access method. It is necessary to reconsider the method of sending a reference signal for positioning and the configuration of the reference signal. Also, a more accurate positioning method is developed by the development of a communication system such as an increase in the UE's moving speed, a change in the interference environment between base stations, and an increase in complexity. It is required.
  • FIG. 3 is a diagram illustrating a PRS pattern in a communication system considering only a macro cell.
  • the PRS pattern corresponds to one subframe (corresponding to 1 ms) on the time axis and one resource block on the frequency axis (corresponding to a bandwidth of 180 kHz and generally corresponds to 12 subcarriers when the bandwidth per subcarrier is 15 kHz). Is defined.
  • the PRS transmits the PRS by leaving the control region and the data region excluding the CRS within a specific subframe, and the RE for which the pattern for the PRS, that is, the PRS sequence is allocated, is a frequency axis. 6 shifts are possible, thereby transmitting the location reference signals in different patterns for up to 6 groups of base stations (cells). That is, all of the base stations (cells) transmit the PRS in one of a total of six patterns at a specific time, and the corresponding UE for each PRS measurement receives the PRS from each base station transmitted at this time. Will be measured.
  • the frequency shift is based on a physical cell ID (PCI), which is a base station (cell) number (ID), and there are only 6 possible patterns, but adjacent base stations (cells) are distributed through appropriate distribution of the base station (cell) number (ID).
  • PCI physical cell ID
  • ID base station number
  • ID base station number
  • cell planning ie, cell planning, so as not to use the same pattern as much as possible.
  • the PRS pattern number may be defined as PCI mod 6.
  • FIG. 3 illustrates a case in which one or two PBCH antenna ports are used.
  • the PRS is transmitted in consecutive N subframes having specific periods (T subframes).
  • the specific period may be one of 160ms, 320ms, 640ms, and 1280ms (1ms corresponds to one subframe.
  • the information or the value of the specific period may be signaled at the upper end in the form of a combination with a specific offset value.
  • the specific period is T PRS
  • the specific offset value is ⁇ PRS
  • the value signaled at the upper end is I PRS
  • the consecutive N subframes are N PRS
  • the subframe satisfying the following Equation 1 starts from:
  • the location reference signal is transmitted in consecutive N PRS subframes.
  • T PRS 160, 320, 640, one of 1280 and, ⁇ PRS has a value between 0 and T 1 PRS-.
  • N PRS is also a value transmitted from the upper end and is one of 1, 2, 4 and 6.
  • n f is a system frame number
  • n s is a slot number.
  • muting may be performed for each transmission period (T PRS ) of the PRS .
  • N PRS subs configured to transmit a location reference within each period by viewing each transmission period (T PRS ) as one bit and using 2, 4, 8, or 16 periods as bitmap information. For frames, it is determined whether to send the PRS or muting.
  • This bitmap information is configured for each base station (cell) and transmitted by an upper end.
  • bitmap information is composed of 4 bits of bitmap information for 4 periods and the bit value is '1001' (1 is transmitted to the position reference signal, 0 is muted; and vice versa).
  • Bitmap information may be configured by transmitting a location reference signal of 0 and muting of 1), and a PRS may be substantially applied to N PRS subframes configured to transmit a location reference within the first and fourth PRS transmission periods.
  • muting is performed without transmitting the PRS and transmitting zero power for N PRS subframes configured to transmit location references within the second and third PRS transmission periods.
  • the 'PRS (transmission) subframe' in which the PRS is transmitted may be configured by an upper layer through I PRS , which is an index or a parameter.
  • PRS patterns (REs for PRS transmission, that is, information on time / frequency resource location) in one subframe, and are defined by PCI (Physical Cell ID). Specifically, the PRS pattern number is PCI mod 6 may be.
  • FIG. 3 shows a possible PRS pattern in the case of a normal CP and an extended CP, and shows one of six patterns. The remaining patterns are a shift of the shown pattern along the frequency axis.
  • PRS may be transmitted to antenna port number 6, 0 to 3 is CRS, 4 is MBSFN-RS, 5 is Rel-8 UE-specific RS (DM-RS), 6 is PRS, and 7 to 14 Rel-9 / 10 DM-RS, 15-22 may be used for CSI-RS, but is not limited thereto.
  • CRS CRS
  • MBSFN-RS MBSFN-RS
  • 5 Rel-8 UE-specific RS
  • 6 is PRS
  • 7 to 14 Rel-9 / 10 DM-RS, 15-22 may be used for CSI-RS, but is not limited thereto.
  • the CSI-RS signal which is a reference signal, to identify channel information during downlink transmission will be described below.
  • the CRS which is a cell-specific reference signal, may be included in all downlink subframes of a cell supporting physical downlink shared channel (PDSCH) transmission and transmitted. It may also be transmitted in one or multiple of antenna port numbers 0-3.
  • PDSCH physical downlink shared channel
  • one reference signal is transmitted for each downlink antenna port, and an RE used for CRS transmission of one of the antenna ports in the slot cannot be used for another antenna port in the same slot.
  • REs to which CRSs for each antenna port are allocated have a period of 6 for subcarriers, which are expressed as six frequency shift values.
  • the six frequency shift values V shift Can be configured as PCI mod 6.
  • the CSI-RS reference signal may be newly defined to identify channel state information of up to eight antennas.
  • the CSI-RS which is currently under discussion, includes antenna ports in the region of 12 subcarriers corresponding to one resource block on a frequency axis for each cycle in a time cycle for each cell. As many as one RE is assigned.
  • the T CSI-RS corresponding to the predetermined period corresponds to a multiple of 5 ms of time consisting of five subframes, and specifically, the T CSI-RS may be 5, 10, 20, 40, 80 ms, or the like. It is not limited to this.
  • the CSI-RS is transmitted in a total of two subframes among 10 subframes in one radio frame corresponding to 10ms. Therefore, if only the CSI-RS pattern for one subframe is defined, the other subframe may be allocated with a certain period.
  • T CSI-RS a certain period for the transmission of such CSI-RS.
  • a communication system using up to 8 x 8 multiple input multiple output antennas has been discussed in both transmitting and receiving stages, and since a different CSI-RS must be transmitted for each antenna port or antenna layer, a total of 8 transmitters are transmitted. It is necessary to allocate CSI-RS for each antenna port so as to be distinguished in the time-frequency domain, and in particular, it is necessary to allocate CSI-RS to distinguish each cell in a multi-cell environment.
  • an antenna layer refers to a data layer that can be logically simultaneously transmitted to multiple antenna ports in a base station or a mobile communication terminal.
  • data of each antenna layer may be the same or different. Therefore, the number of antenna layers may be equal to or smaller than the number of antenna ports.
  • the antenna port number is used to represent each time-frequency resource region. Therefore, when the antenna port number is different in the antenna port used for the same purpose, it means a time-frequency resource region that is spatially distinguished as different antennas.
  • the antenna port number of the CRS using up to 4 antennas is 0 to 3, and the DM-RS (Demodulation RS), which is a UE-specific reference signal of MBSFN-RS and LTE Rel-8, which uses up to 1 antenna, respectively.
  • the antenna port numbers are 4, 5, and 6, respectively.
  • the antenna port numbers of DM-RS of LTE Rel-10 using up to 8 antennas are 7 to 14.
  • up to eight antennas are used, and subsequent antenna port numbers can be used.
  • Antenna port numbers 15 to 22 are examples, so antenna port number 15 may be the first antenna port for CSI-RS transmission. In this case, when the antenna port number is different in each specific reference signal, it means that the antennas have time-resource areas that are spatially separated from each other.
  • the subframe in which the CSI-RS is transmitted may be referred to as a "CSI-RS subframe” or a "CSI-RS subframe", and the CSI-RS subframe is an upper layer through an index or a parameter I CSI-RS .
  • the CS-RS pattern in which the CSI-RS is mapped to one subframe includes a subframe structure (hereinafter referred to as FS), whether a cyclic shift (CP) is normal or extended, and an antenna Can be defined according to the number of ports (one of two, four, eight).
  • FS subframe structure
  • CP cyclic shift
  • Information on the CSI-RS pattern (REs for CSI-RS transmission, that is, information on time / frequency resource location) in one subframe is transmitted by an upper end, and the CSI-RS pattern is specifically a normal CP.
  • there are two or two, there are 32 patterns ( mandatory 20 and optional 12), and in consideration of the maximum 32 patterns, signals are signaled for each cell at the upper end with 5 bits.
  • the mandatory case of the CSI-RS pattern number representation means a general case applied to both FS1 (FDD) and FS2 (TDD), and the optional case is only FS2 (TDD). Means additional cases that apply.
  • FS1 FDD
  • FS2 TDD
  • CSI-RS pattern when having a normal CP and an extended CP, respectively.
  • FIG. 5A illustrates all five CSI-RS patterns possible when the number of antenna ports is eight as a case of a mandatory having a normal CP
  • FIG. 5B shows four CSIs available in the case of having an extended CP. -Show all the patterns of RS.
  • numbers are numbers of respective antenna ports or antenna layers for CSI-RS transmission
  • alphabet subscripts are identifiers indicating CSI-RS patterns.
  • the antenna port when the antenna port has a normal CP and there are eight antenna ports (antenna port numbers 0 to 7), the antenna may have a total of five CSI-RS patterns up to a patterns to e patterns. have.
  • the CSI-RS pattern when the number of CSI-RS antenna ports is two or four instead of eight is configured in a nested structure when the number of CSI-RS antenna ports is eight.
  • the pattern when the number of CSI-RS antenna ports is four is composed of patterns divided within each specific pattern when the number of CSI-RS antenna ports is eight, so the total number of patterns is CSI-RS antenna This is doubled when the number of ports is eight.
  • the pattern when the number of CSI-RS antenna ports is two is also composed of the divided patterns within each specific pattern when the number of CSI-RS antenna ports is four, so the total number of patterns is the number of CSI-RS antenna ports. It is twice as many as four.
  • the number of CSI-RS antenna ports is eight (a to e in FIG. 5), and the CSI-RS antenna
  • the number of ports is 4
  • the number is 10 (a to j), which is twice that, and when the number of CSI-RS antenna ports is 2, the number is 20 (a to t).
  • FIG. 5B illustrates a case in which both FS1 (Frame Structure 1 and FDD) and FS2 (Frame Structure 2 and TDD (except DwPTS of a special subframe)) are applied in the same manner and are extended CP.
  • the CSI-RS may be resource-assigned, and in the case of a mandatory having an extended CP, and there are eight antenna ports (antenna port numbers 0 to 7), a total of four CSI-RSs from a pattern to d pattern It may have an RS pattern.
  • the CSI-RS pattern when the number of CSI-RS antenna ports is two or four instead of eight is configured as a nested structure when the number of CSI-RS antenna ports is eight. same.
  • CSI-RS pattern in case of optional (optional) for FS2 (Frame Structure 2, TDD (except DwPTS of Special Subframe)) is not shown separately, but in the case of normal CP, three CSI if the number of antennas is 8 -6 RS-RS patterns, 6 CSI-RS patterns if the number of antennas, 12 CSI-RS patterns are possible if the number of antennas is two.
  • three CSI-RS patterns are possible when the number of antennas is eight, six CSI-RS patterns when the number of antennas is four, and twelve CSI-RS patterns when the number of antennas is two.
  • configured by the higher layer means that the base station (eNB or cell) is configured to transmit the reference signal to the UE through the cell-specific configuration information (cell-specific).
  • the configuration information may be transmitted to each UE in the corresponding cell through RRC information and the like and used for demodulation.
  • the subject configuring the cell-specific information may be an Evolved Serving Mobile Location Center (E-SMLC), which is an upper end component in the case of PRS, and the CSI-RS may be a base station (eNB or Cell), but is not limited thereto.
  • E-SMLC Evolved Serving Mobile Location Center
  • the CSI-RS may be a base station (eNB or Cell), but is not limited thereto.
  • PRS which is one of downlink reference signals defined in the LTE Rel-9 system
  • CSI-RS defined in the LTE Rel-10 system is used for channel measurement following CRS defined in the LTE Rel-8 system.
  • the PRS and the CSI-RS are transmitted in a specific transmission subframe, each having a specific period and subframe offset for each cell, and even in a subframe configured for PRS or CSI-RS transmission. It is sent to a specific RE with a very specific pattern.
  • the transmission subframe defined for each reference signal may have a different value for each cell, and if there are no special constraints, the two reference signals are substantially the same in the same subframe.
  • PRS and CSI-RS can be transmitted simultaneously.
  • the patterns defined for each cell for each reference signal also overlap substantially, which may cause a collision problem.
  • the PRS of every subsequent period when the PRS and the CSI-RS collide in one subframe Each transmission subframe collides with the CSI-RS transmission subframe. This affects the OTDOA measurement accuracy required for measuring the position of the UE.
  • REs for all PRS transmissions in the collided subframe are used for location measurement without information on the CSI-RS configuration.
  • information about the CSI-RS configuration may be used for location measurement only for REs that do not collide with the CSI-RS among the REs for PRS transmission.
  • the REs for the PRS transmission used for position measurement may be reduced, resulting in performance degradation.
  • the UE measures the CSI-RS without information on the PRS configuration. That is, the REs for CSI-RS transmission collide with the PRS to include REs in which information for the PRS is mixed as well as the CSI-RS. Therefore, this affects the CSI measurement accuracy.
  • an allocation target reference signal allocated to a time-frequency resource space among a PRS and a CSI-RS will be referred to as a first reference signal, and the remaining reference signals will be referred to as a second reference signal.
  • the second reference signal configuration information for one or more cells is checked. And determining configuration information (transmission subframe or allocation RE) of the first reference signal so as not to overlap with a subframe or RE configured for transmission of the second reference signal as much as possible.
  • the method may further include allocating and transmitting the first reference signal to the determined subframe or the allocation RE.
  • the aforementioned first reference signal is a PRS
  • the second reference signal is a CSI-RS
  • a base station eNB or cell
  • the first reference signal will be a CSI-RS
  • the second reference signal will be a PRS.
  • the present invention is not limited to this case, and the subject that schedules the PRS or generates and transmits the PRS may be a base station such as an eNB other than the E-SMLC, and the subject that generates and transmits the CSI-RS is the eNB.
  • E-SMLC which is the upper end of the base station, may be.
  • the first embodiment avoids duplication in subframe units and avoids duplication in RE units. It can be roughly divided into the second embodiment.
  • the step of identifying the second reference signal configuration information for one or more cells in the allocation of the first reference signal which is a target reference signal of the PRS and CSI-RS in the time-frequency resource space
  • the method may include determining a transmission subframe of the first reference signal such that it does not overlap with a subframe configured for the transmission of the second reference signal.
  • the first embodiment is a method of limiting CSI-RS allocation in consideration of the given PRS configuration information (FIGS. 6 and 7), and in contrast, a method of controlling PRS allocation in consideration of the given CSI-RS configuration information (FIG. 8). , 9).
  • the first method of configuring a PRS subframe again by completely avoiding the CSI-RS subframe (FIG. 9).
  • A) and a second method of constructing a PRS subframe by avoiding CSI-RS subframes as much as possible, but performing PRS muting on the overlapping subframes (b of FIG. 9).
  • the RE includes a step of assigning the PRS and the CSI-RS by muting or puncturing not to transmit the PRS. .
  • a total of four REs among the 24 REs included in the three CSI-RS patterns are REs to which the original PRSs are assigned.
  • PRSs are not allocated to the four REs, that is, muting or puncturing. It is.
  • FIG. 6 to 9 are views for the first embodiment, and Figs. 10 to 11 are for the second embodiment.
  • FIG. 6 is a flowchart of a CSI-RS allocation method according to the first embodiment of the present invention.
  • the CSI-RS which is an allocation target reference signal among the PRS and the CSI-RS
  • the time-frequency resource space confirming the PRS configuration information of one or more base stations or cells including itself.
  • the CSI-RS allocation method as shown in FIG. 6 may be performed in a base station or a cell, but is not limited thereto, and includes all components for scheduling CSI-RS transmission, such as an E-SMLC, which is an upper end of the base station or cell. It should be interpreted as. However, hereinafter, for convenience, the subject allocating the CSI-RS will be described with a base station or a cell.
  • prior to S610 may include a step (S605) of receiving the PRS configuration information from one or more base stations (cells) or higher stages including the self, and the SRS confirms the transferred PRS configuration information.
  • the upper end of transmitting the PRS configuration information may be an E-SMLC, but is not limited thereto.
  • the method may further include allocating the CSI-RS to a specific RE of a specific subframe and transmitting the same to the UE according to the CSI-RS configuration information determined after S620 (S630).
  • the number of consecutive PRS transmission subframes (N PRS ) of a cell or a base station considered in its CSI-RS transmission period (T CSI-RS ) is subtracted (T CSI-RS
  • T CSI-RS the number of consecutive PRS transmission subframes of a cell or a base station considered in its CSI-RS transmission period
  • the UE when the UE actually receives the PRS from several base stations or cells, it may be in an Asynchronous Receiving State due to the difference in time delay, so that when the UE determines its CSI-RS subframe, (T CSI-RS- (N PRS + 1or2) minus 1 or 2 plus the number of consecutive PRS transmission subframes (N PRS ) of the cell or base station considered in the RS transmission period (T CSI-RS ))
  • the CSI-RS subframe may be selected from the server frames. Or, in consideration of the worst case in the above case, it may be easily unified to ' T CSI-RS- ( N PRS +2)'.
  • the N PRSs of the cell or base station under consideration are different from each other, the largest value among the N PRSs of the cell or base station under consideration is selected as the N PRS applied to the scheme.
  • the CSI-RS transmission subframe is configured to avoid a subframe for preconfigured PRS transmission.
  • each base station (eNB) or cell More specifically, each base station (eNB) or cell,
  • a) Receive information on the configuration of the PRS transmission subframe.
  • a corresponding reference signal is allocated to a subframe for the configured PRS transmission and a subframe for the CSI-RS transmission configured by the process of b).
  • the number of subframes (offsets) in which the CSI-RS can be allocated by avoiding the PRS within the CSI-RS transmission period T CSI-RS given in b) is ' T CSI-RS - N ' in the synchronous reception state.
  • FIG. 7 illustrates an example of a CSI-RS subframe configuration according to the CSI-RS resource allocation method of the embodiment of FIG. 6, in which FIG. 7A is in a synchronous reception state of a terminal, and FIG. 7B is in an asynchronous reception state of a terminal. Corresponding.
  • FIG. 7 illustrates a subframe configuration in which a specific UE receives PRS from seven cells or base stations.
  • one grid means one subframe and shows a total of ten subframes horizontally, and a serving cell (that is, a cell to which the CSI-RS allocation method according to the present embodiment is applied) and six neighboring cells or It is exemplified by considering the PRS configuration of the base station. That is, it is assumed that the UE receives the PRS in the sixth and seventh subframes from each of seven cells from the top to the bottom.
  • 7a in FIG. 7 is a synchronous reception state.
  • the UE when the UE receives the PRS from the multiple cells, some delay occurs, and thus, the actual multiple cells transmit the PRS in consideration of the 'asynchronous reception state', in which the PRS is asynchronously received.
  • the 5th and / or 8th subframes which are immediately preceding and / or immediately following the 6th, 7th subframe, may also be excluded from the CSI-RS subframe. That is, the number of sub-frames (offset) can be also in 7b (in Fig.
  • FIG. 8 is a flowchart of a PRS allocation method in the first embodiment of the present invention.
  • identifying CSI-RS configuration information of one or more base stations or cells S810).
  • determining (S820) the PRS (transmission) configuration information so as not to overlap with a subframe or resource element configured for transmission of the CSI-RS as much as possible.
  • the PRS transmission configuration information includes at least one of PRS (transmission) subframe information for PRS transmission and PRS allocation RE which is a time-frequency resource space to which the PRS is allocated.
  • the base station or cell in which the CSI-RS configuration information is confirmed may be a specific number of neighboring base stations or cells including itself.
  • the PRS allocation method as shown in FIG. 8 may be performed by an upper component, such as an E-SMLC, but is not limited thereto, and should be interpreted as including all components for scheduling PRS of each base station or cell.
  • the subject performing PRS allocation as shown in FIG. 8 is not limited to an upper end of a base station such as an E-SMLC, and may be each base station or a cell itself. However, hereinafter, for convenience, the subject of PRS allocation will be described with E-SMLC.
  • the method may further include a step (S805) of receiving the CSI-RS configuration information from one or more base stations or cells before S810, and in S810, the CSI-RS configuration information is thus confirmed.
  • the method may further include transmitting the PRS configuration information determined after S820 to a corresponding base station or cell (S830), wherein the base station or cell that has received the PRS configuration information may specify a specific subframe according to the PRS configuration information.
  • PRS is allocated to the RE and can be transmitted to the UE.
  • the CSI-RS configuration information may include CSI-RS transmission period ( T CSI-RS ) and transmission subframe offset ( ⁇ CSI-RS ) information, which will be signaled in the form of I CSI-RS as described above.
  • T CSI-RS CSI-RS transmission period
  • ⁇ CSI-RS transmission subframe offset
  • the PRS transmission subframe is configured to avoid a subframe for preconfigured CSI-RS transmission, and may be further divided into a first scheme and a second scheme.
  • the E-SMLC (upper end scheduling each base station eNB for positioning) is:
  • the CSI-RS transmission subframe configuration information (that is, CSI-RS configuration information) is received from each base station (eNB) or a cell (Cell).
  • the CSI-RS configuration information may include I CSI-RS (information indicating a CSI-RS transmission period ( T CSI-RS ) and a transmission subframe offset ( ⁇ CSI-RS )).
  • PRS transmission subframe of each cell is constructed by avoiding subframes for CSI-RS transmission based on CSI-RS transmission subframe configuration information of each base station or cell.
  • the E-SMLC transmits the determined PRS transmission subframe configuration information to the corresponding cell or base station.
  • the base station or cell receiving the PRS configuration information from the E-SMLC allocates the PRS and CSI-RS to the terminal based on the preconfigured CSI-RS configuration information and the PRS configuration information received by the process of c).
  • the terminal decodes the PRS and the CSI-RS to perform positioning and channel state estimation.
  • the time-frequency region to which the PRS and the CSI-RS are allocated does not overlap as much as possible, accurate positioning and channel estimation is performed. This becomes possible.
  • the PRS transmission subframe is not completely overlapped with the CSI-RS subframe, but in the second method, the PRS may be muted when there are some overlapping subframes.
  • the E-SMLC (upper stage scheduling each base station eNB for positioning) is:
  • the CSI-RS configuration information may include I CSI-RS , which is information indicating a CSI-RS transmission period ( T CSI-RS ) and a transmission subframe offset ( ⁇ CSI-RS ).
  • PRS transmission subframe of each cell is constructed by avoiding subframes for CSI-RS transmission as much as possible based on the CSI-RS transmission subframe configuration information of each base station or cell received (duplicate subframes may be generated) However, PRS muting information for muting the PRS is generated for the redundant subframe.
  • the E-SMLC transmits PRS transmission subframe configuration information including PRS muting information to a corresponding cell or base station.
  • the base station or cell receiving the PRS configuration information from the E-SMLC allocates the PRS and the CSI-RS based on the preconfigured CSI-RS configuration information and the PRS configuration information (including PRS muting information) received by the process of c). To transmit to the terminal.
  • FIG. 9 illustrates an example of a configuration of a PRS subframe using the PRS resource allocation method of the embodiment of FIG. 8, in which FIG. 9A corresponds to a first scheme and FIG. 9B corresponds to a second scheme.
  • one lattice means one subframe, and a total of 13 subframes are shown horizontally.
  • CSI-RS configuration of a total of seven neighboring cells or base stations (including their own base station / cell). To illustrate. That is, it is assumed that each of seven cells from top to bottom has a CSI-RS transmission period of 10, 5, 20, 5, 10, 10, and 10 ms, and transmits CSI-RS in a shaded subframe.
  • the E-SMLC determines PRS configuration information of a specific cell or base station
  • the CSI-RS server frame of another identified cell / base station is completely excluded. That is, in 9a, the PRS configuration information is determined such that only one or more of the subframes (fourth, fifth, ninth, and tenth subframes) in which seven other cells / base stations do not transmit the CSI-RS at all are PRS transmission subframes. It is done.
  • the PRS subframe is selected so as not to overlap with the CSI-RS subframe as much as possible, but the PRS is muted for subframes overlapping with CSI-RS subframes of some other cells / base stations. do.
  • one or more of the 4th to 10th subframes are determined as the PRS transmission subframes so as not to overlap with the CSI-RS subframes as much as possible, and the PRS configuration information is muted in the 6th and 8th subframes, which are redundant subframes. Will be determined.
  • FIG. 10 is a flowchart of a reference signal allocation method according to a second embodiment of the present invention.
  • the method for allocating a reference signal includes: checking the PRS configuration information and the CSI-RS configuration information (S1010), in the same subframe. Determining whether the PRS and the CSI-RS are allocated (S1020), when the PRS and the CSI-RS are allocated to the same subframe, only the CSI of the n CSI-RS patterns which are part of the N CSI-RS patterns available It may be configured to include a step (S1030) to allocate the RS.
  • the corresponding RE may further include muting or puncturing so as not to transmit the PRS (S1040).
  • a total of four REs among the 24 REs included in the three CSI-RS patterns are REs to which the original PRSs are assigned.
  • PRSs are not allocated to the four REs, that is, muting or puncturing. It is.
  • the extended CP and in the general case for both FS1 (FDD) and FS2 (TDD), out of the total 4/8/16 CSI-RS patterns available It is preferable to assign the CSI-RS only to a total of 2/4/8 CSI-RS patterns arranged on the fifth and sixth symbol axes or the eleventh and twelfth symbol axes. (I.e. when the number of antennas (ports) is 8, 4 and 2 respectively, N is 4, 8 and 16 respectively and n is 2, 4 and 8 respectively)
  • This second embodiment may be implemented alone or in combination with the first embodiment described above in some cases.
  • the second embodiment alone has the effect of avoiding collision between the PRS and the CSI-RS, even if according to the first embodiment, a subframe having the same PRS and the CSI-RS must be allocated. May be implemented in series with the first embodiment.
  • T CSI-RS transmission period
  • N PRS number of transmission subframes
  • the overlap avoidance scheme as shown in FIGS. 6 and 7 may not be sufficient. (I.e., the CSI-RS allocation limit becomes larger)
  • the above-described embodiments according to Figs. 6 and 7 are not applicable.
  • the second embodiment can be configured in such a case.
  • FIG. 11 shows an example of a reference signal allocation pattern according to the second embodiment, and corresponds to a general case of eight antennas (ports), normal CPs, and both FDD / TDD.
  • the CSI-RS is allocated to only some of the CSI-RS patterns.
  • some patterns for allocating the CSI-RS may be determined in the order of the smallest number of collisions with the RE for the PRS allocation in the pattern, but is not limited thereto.
  • the CSI-RS is allocated to only three CSI-RS patterns having 0 or 1 REs for PRS allocation, that is, three CSI-RS patterns in the 10th and 11th symbol axes, among the total 5 patterns. .
  • the RE is muted or punctured so as not to transmit the PRS.
  • some REs may not transmit PRS in the pattern for PRS transmission, but the ratio is not large.
  • the ratio is not large. For example, in the resource space consisting of a total of one subframe (1ms) and 12 subcarriers (180Khz) in FIG. 11, as a result, a total of 14 REs are allocated for PRS transmission, but some REs (0 4) cannot transmit PRS but mute or puncture and transmit CSI-RS instead.
  • C pattern can be assigned to pattern a, pattern b and pattern c) .
  • the pattern C is used for CSI-RS.
  • the number of overlapping REs is 0 when sending and the number of overlapping REs is 2 when sending CSI-RS in a c pattern, even when sending CSI-RS considering multiple cells at the same time in a multi-cell environment such as CoMP or HeNet. Only four REs (CSI-RS pattern a + b + c) overlap the PRS.
  • FIG. 12 is a flowchart illustrating a reference signal allocation method according to an embodiment in which some of the first embodiment and the second embodiment are combined.
  • the PRS and CSI-RS in order to allocate the PRS and CSI-RS in the time-frequency resource space, confirming the PRS configuration information for one or more base stations or cells including itself (S1210) and the PRS transmission Determining the CSI-RS subframe such that the CSI-RS subframe is overlapped with the PRS transmission subframe (S1220) so that the CSI-RS subframe is not overlapped with the subframe configured for the maximum number of available CSI-RS subframes. And allocating the CSI-RS to only n CSI-RS patterns which are some of the RS patterns (S1230).
  • the corresponding RE may further include muting or puncturing the PRS so as not to transmit the PRS (S1240).
  • the method may further include a step (S1205) of receiving the PRS configuration information from one or more base stations (cells) or higher stages including itself before S1210. Check the PRS configuration information.
  • the method may further include allocating the CSI-RS and the PRS to a specific RE of a specific subframe according to the CSI-RS configuration information and the PRS configuration information determined after the S1230 or S1240 and transmitting the same to the UE.
  • a given CSI-RS transmission period T CSI-RS The number of subframes (offsets) that can be allocated to the CSI-RS to avoid the PRS within the T CSI-RS - N PRS ", In asynchronous receive state" T CSI-RS -( N PRS +2) 'or' T CSI-RS -( N PRS +1) ", and in consideration of all circumstances, T CSI-RS -( N PRS Can be unified in the same manner as in the first embodiment.
  • step S1240 the PRSs are not allocated to the four REs, that is, muting or puncturing. .
  • Each base station (eNB) or cell is a base station (eNB) or cell.
  • PRS transmission subframe configuration information is received from a cell belonging to the base station (eNB) from all neighbor cells transmitting PRS when necessary, and the PRS transmission subframe configuration information is transmitted through a PRS transmission period ( T PRS).
  • T PRS PRS transmission period
  • I PRS information indicating a transmission subframe offset ( ⁇ PRS ), and N PRS (the number of consecutive transmission subframes within one period).
  • CSI-RS transmission subframe is configured by avoiding the subframe for PRS transmission as much as possible based on the received PRS transmission subframe configuration information.
  • step b) If the CSI-RS subframe and the PRS subframe overlap in step b) (whether duplication can be recognized through a) or b), within the subframe, PRS and CSI-RS transmission Allocable REs are configured to not overlap each other. (I.e. assign CSI-RS only to some of the available CSI-RS patterns, and optionally mute or puncture so that no PRS is sent in all REs within the CSI-RS allocation pattern)
  • the corresponding reference signals are allocated to the subframe for the preconfigured PRS transmission and the subframe and the RE for the CSI-RS transmission configured by the processes of b and c and then transmitted to the terminal.
  • the embodiment as shown in FIG. 12 may include a configuration for transmitting the information of the muted or punctured PRS RE to the UE for transmission of the CSI-RS. Because of this, the UE should decode. Otherwise, if the muted or punctured PRS RE for transmission of CSI-RS is known as the RE for PRS transmission and decoded, the information actually included is CSI-RS. This is because there is a risk of performance degradation.
  • FIG. 13 is a block diagram of an apparatus for allocating a reference signal according to an embodiment of the present invention.
  • a reference signal resource allocation apparatus 1300 may include a reference signal sequence generator 1320, a second reference signal configuration information checking unit 1310, and a first reference signal resource allocator ( 1330).
  • the first reference signal is a target reference signal for resource allocation in the time-frequency space among the PRS and the CSI-RS, and the second reference signal is the remaining reference signal.
  • the second reference signal configuration information receiver 1340 for receiving configuration information (one or more of a transmission period, an offset, the number of consecutive transmission subframes, and an allocation pattern) of the second reference signal from one or more adjacent cells / base stations or higher stages. ) May be further included.
  • the reference signal sequence generator 1320 receives external information such as system-specific information and generates a cell-specific PRS sequence or a CSI-RS sequence based thereon.
  • the system-specific information may be one or more of base station information (cell ID, etc.), relay (relay) node information, terminal (user device) information, subframe number, slot number, OFDM symbol number, CP sizes, but is not limited thereto. It is not.
  • the base station (cell) information may be, for example, base station antenna information, base station bandwidth degree, and base station cell ID information.
  • the reference signal sequence generator 1310 may generate a PRS sequence or a CSI-RS sequence of each corresponding cell by receiving information such as a cell ID, a slot number, an OFDM symbol number, and a CP size.
  • the second reference signal configuration information confirming unit 1310 may function alone or in conjunction with the second reference signal configuration information receiving unit 1340, and may be configured to limit the allocation of the first reference signal.
  • the second reference signal configuration information is checked.
  • the first reference signal resource allocator 1330 determines first reference signal configuration information for allocating the first reference signal sequence generated by the first reference signal sequence generator 1310 to the time-frequency resource region.
  • the first reference signal configuration information is determined so as not to overlap with the transmission subframe and / or the RE of the second reference signal already confirmed.
  • the PRS and the CSI-RS overlap each other as much as possible in the transmission subframe unit or the RE unit according to each embodiment described in connection with FIGS. 6 to 12 or a combination thereof.
  • PRS configuration information or CSI-RS configuration information is determined so as not to.
  • the first reference signal resource allocator 1330 is a first embodiment for avoiding duplication in units of subframes.
  • the CSI-RS allocation is limited in consideration of given PRS configuration information (FIGS. 6 and 7;
  • the CSI-RS is the first reference signal, a method of controlling PRS allocation in consideration of the given CSI-RS configuration information (FIGS. 8 and 9; PRS is the first reference signal and CSI-RS is the first reference signal). 2 reference signals) may be used.
  • a method of controlling PRS allocation in consideration of CSI-RS configuration information (FIGS. 8 and 9) in the first embodiment, a first method of configuring a PRS subframe again by completely avoiding a CSI-RS subframe (9a of FIG. 9).
  • a second method (9b of FIG. 9) for configuring PRS subframes by avoiding CSI-RS subframes as much as possible but performing PRS muting on overlapping subframes.
  • the n CSI-RS which is part of the available N CSI-RS patterns The CSI-RS may be allocated only to the pattern, and in addition, if there is an RE to which the PRS should be allocated in the CSI-RS pattern to which the CSI-RS is allocated, the RE may be muted or punctured so as not to transmit the PRS.
  • the first reference signal sequence assigned to the resource elements is then multiplexed with the base station transmission frame.
  • the first reference signal resource allocator 1330 is a resource allocation method for the PRS or the CSI-RS.
  • the first reference signal resource allocator 1330 allocates resources to corresponding OFDM symbols and subcarrier (or subcarrier) positions according to a predetermined rule, and determines a predetermined frame timing. Performs a basic function of multiplexing with a base station transmission frame.
  • the reference signal allocation apparatus may be internal to the E-SMLC or the base station or cell under the control of the E-SMLC. If the first reference signal is a CSI-RS, it may be implemented in the base station or the cell or in conjunction with it.
  • the first reference signal resource allocator 1330 may operate in conjunction with a resource element mapper which is a component of the base station apparatus. In some cases, the first reference signal resource allocator 1330 and the resource may be operated.
  • the element mapper may be integrated to implement.
  • the entire base station apparatus or the reference signal transmission apparatus including the CSI-RS and / or the PRS will be described in more detail with reference to FIG. 14 below.
  • FIG. 14 is a functional block diagram of a reference signal transmission apparatus 1400 to which the present embodiments are applied.
  • the reference signal transmission apparatus 1400 includes an RE mapper 1410, a reference signal allocation device 1300, an OFDM signal processor 1430, and the like.
  • the reference signal assignment apparatus 1300 may be configured as shown in FIG. 13.
  • the reference signal transmission device 1400 may further include the configuration for the transmission of other data or information in addition to the CSI-RS, specifically, the configuration of the basic transmission device in the base station Elements such as a scrambler, a modulation mapper, a layer mapper, a layer mapper, a precoder, an OFDM signal generator, and the like may be further included, but in the present embodiment, such a configuration is included. This is not necessary.
  • the reference signal transmission device 1400 may be implemented in the communication system of the base station 10 of FIG. 1 or may be implemented in conjunction with it.
  • bits input in the form of code words through channel coding in downlink are scrambled by a scrambler and then input to a modulation mapper.
  • the modulation mapper modulates the scrambled bits into a complex modulation symbol, and the layer mapper maps the complex modulation symbol to one or more transport layers.
  • the precoder then precodes the complex modulation symbol on each transmission channel of the antenna port.
  • the RE mapper then maps the complex modulation symbol for each antenna port to the corresponding RE.
  • the first reference signal resource allocator 1330 may Alternatively, the CSI-RS or the PRS is allocated to the time-frequency domain according to the method described with reference to FIGS. 6 to 12 in conjunction with the RE mapper, and multiplexed with the base station transmission frame at a predetermined frame timing.
  • the reference signal RS and the control signals including the PRS and / or the CSI-RS may be allocated to the REs first, and the data received from the precoder may be allocated to the remaining REs, but is not limited thereto.
  • the OFDM signal processor 1430 generates a complex time domain OFDM signal for the time-frequency resource region to which the first reference signal sequence is allocated so that duplication with the second reference signal is avoided in units of subframes and REs.
  • the complex time domain OFDM signal is transmitted through the corresponding antenna port.
  • the reference signal allocation apparatus 1300 and the RE mapper 1410 may be implemented by hardware or software integration.
  • the first reference signal resource allocator 1330 of the reference signal allocation device 1300 may be implemented to be integrated with the RE mapper 1410 of the transmitting device.
  • the first reference signal resource allocator 1330 may be implemented. Or may be represented by an RE mapper 1410.
  • the present invention is not limited thereto. That is, the signal generation structure of the downlink physical channel of the wireless communication system to which the embodiments of the present invention are applied may omit other components, substitute or change other components, or add other components.
  • 15 is a flowchart illustrating a method for receiving a reference signal according to an embodiment of the present invention.
  • the method of receiving a reference signal according to an embodiment of the present invention is generally performed by a terminal, but is not limited thereto.
  • the UE receives an OFDM signal generated by resource allocation so that duplication of a PRS sequence and a CSI-RS sequence is avoided as much as possible in one or more units of a subframe and an RE from a base station ( S1510, demodulating the received OFDM signal to extract the PRS sequence and the CSI-RS sequence (S1520), and estimating the location information and the channel state information from the extracted PRS sequence and the CSI-RS sequence ( S1530) may be configured to include.
  • the OFDM signal received by the UE in step S1510 is generated by resource allocation such that duplication of PRS sequence and CSI-RS sequence is avoided as much as possible, and the scheme of FIG. 6 to FIG. Can be used.
  • a method of limiting CSI-RS allocation in consideration of given PRS configuration information (FIGS. 6 and 7; PRS is the second reference signal and CSI-RS is the first method).
  • a method of controlling PRS allocation in consideration of given CSI-RS configuration information (FIGS. 8 and 9; PRS is the first reference signal and CSI-RS is the second reference signal) may be used.
  • the PRS and the CSI-RS are allocated to the same subframe in order to avoid duplication in the RE unit (second embodiment), the CSI-RS is allocated only to the n CSI-RS patterns which are part of the available N CSI-RS patterns.
  • a muting or puncturing method may be used in the corresponding RE so as not to transmit the PRS, but is not limited thereto. The detailed description will be omitted to avoid.
  • PRS sequence or CSI-RS sequence extraction in step S1520 can be performed in conjunction with or included in the resource element de-mapping to extract specific information (data or control signal, etc.) from the demodulated OFDM signal have. That is, in the RE demapping process after OFDM signal demodulation, only the REs for PRS and CSI-RS are selected among all REs that are subject to RE demapping (this corresponds to the PRS pattern and the CSI-RS pattern). The process may be performed by extracting a PRS sequence and a CSI-RS sequence mapped to the REs.
  • Estimating the position information in step S1530 extracts the PRS sequence of each cell from the OFDM signal transmitted from each cell (preferably three or more pico cells or macro cells), and then auto-correlates the extracted PRS sequence. By measuring the peak by correlation, the delay time of the OFDM signal transmitted from each cell may be measured, and the location information of the terminal may be estimated by triangulation. .
  • 16 is a diagram showing the structure of a reference signal receiving apparatus according to the present embodiment.
  • a reference signal receiver 1600 of a terminal in a wireless communication system includes a reception processor 1610, an RE demapper 1620, a reference signal sequence extractor 1630, and a measurement unit 1640. Although not shown, it may further include a decoding unit, a control unit and the like. In this case, the receiver 1600 may be the terminal 10 of FIG. 1.
  • the reception processor 1610 is resource-assigned to avoid duplication of OFDM signals generated by the RS 1300 according to the present embodiment, i.e., a subframe unit or RE unit PRS sequence and a CSI-RS sequence as much as possible. A function of receiving the generated OFDM signal from the cell or base station.
  • the RE demapper 1620 demaps the information allocated to the respective REs in the received OFDM signal.
  • the demapped information may include various reference signals such as cell-specific PRS or CSI-RS in addition to control information and data information.
  • the sequence extractor 1630 may be a device included in or interlocked with the RE demapper 1620, and in particular, PRS and CSI may be used to demap information allocated to each RE by the RE demapper 1620. Demaps information related to the RS to extract the PRS sequence and the CSI-RS sequence. Accordingly, the sequence extractor 1630 extracts the PRS sequence and the CSI-RS sequence in the reverse order of the reference signal allocation scheme according to one of the schemes described with reference to FIG. 14.
  • the measurement unit 1640 may estimate the location information of the corresponding UE from the PRS sequence for one or more cells (preferably three or more) extracted by the sequence extractor, and use the extracted CSI-RS sequence. It performs a function of estimating downlink channel state information.
  • the RE demapper 1620 and the reference signal sequence extractor 1630 of the reference signal receiver 1600 are integrated and implemented to demap information allocated to each RE of the received OFDM signal. Thereafter, the PRS sequence and the CSI-RS sequence of the cell transmitting the OFDM signal may be extracted. In the present specification, such a component will be collectively referred to as a reference signal sequence extractor 1630.
  • the reference signal receiver 1600 is a device for receiving a signal transmitted from the reference signal transmitter 1400 in pairs with the wireless communication system or the reference signal transmitter 1400 described with reference to FIG. 14. Therefore, the reference signal receiving apparatus 1600 is composed of elements for signal processing of the reverse process of the reference signal transmitting apparatus 1400. Accordingly, it is to be understood that parts not specifically described with reference to the reference signal receiver 1600 may be replaced one-to-one with elements for signal processing in a reverse process of the reference signal transmitter 1400.

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Abstract

La présente invention concerne un système de communication sans fil, et plus particulièrement un procédé et un dispositif pour attribuer un signal de référence de positionnement (PRS) ou un signal de référence d'informations d'état de canal (CSI-RS), ainsi qu'un dispositif et un procédé pour recevoir un signal de référence à l'aide desdits procédé et dispositif dans le système de communication sans fil. Pour attribuer un premier signal de référence parmi les signaux PRS et CSI-RS, qui est une cible devant être attribuée, à un espace de ressources temps-fréquence et pour transmettre le premier signal de référence, un procédé de la présente invention comprend les étapes consistant à : vérifier des informations de configuration sur un second signal de référence pour une ou plusieurs cellules ; et déterminer les informations de configuration (sous-trame de transmission ou élément de ressource d'attribution) sur le premier signal de référence de sorte que les informations de configuration recouvrent partiellement, aussi peu que possible, une sous-trame de transmission ou un élément de ressource d'attribution configuré pour la transmission du second signal de référence. Pour attribuer ensemble le PRS à des fins de mesure de position et le CSI-RS à des fins d'estimation de canal à un espace de ressources et pour transmettre le PRS et le CSI-RS, on attribue des ressources de sorte à recouvrir partiellement, aussi peu que possible, une sous-trame ou un élément de ressource de base, empêchant ainsi au maximum une dégradation des performances de la mesure de position et des performances d'estimation de canal d'un terminal.
PCT/KR2012/000946 2011-02-14 2012-02-09 Procédé et dispositif pour attribuer des signaux de référence, et procédé et dispositif pour recevoir les signaux de référence avec lesdits procédé et dispositif dans un système de communication sans fil Ceased WO2012111937A2 (fr)

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CN114142983A (zh) * 2016-09-30 2022-03-04 高通股份有限公司 针对在窄带物联网（NB-IoT）中的定位参考信号（PRS）的调度
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WO2018084783A1 (fr) * 2016-11-04 2018-05-11 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif sans fil et nœud de réseau pour un système de communication sans fil et procédés associés
US10624066B2 (en) 2016-11-04 2020-04-14 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for control-signal transmission in a wireless communication system
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US11588593B2 (en) 2019-04-12 2023-02-21 Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University) Method and device for transmitting and receiving reference signal for positioning
WO2020209655A1 (fr) * 2019-04-12 2020-10-15 한양대학교 산학협력단 Procédé et dispositif de transmission et de réception d'un signal de référence destiné à un positionnement
CN114641959A (zh) * 2019-11-07 2022-06-17 高通股份有限公司 用于定位参考信号(prs)的低层(dci或mac ce)dl穿孔指示器
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