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US20170214508A1 - Method for receiving reference signal in wireless communication system and apparatus therefor - Google Patents

Method for receiving reference signal in wireless communication system and apparatus therefor Download PDF

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Publication number
US20170214508A1
US20170214508A1 US15/326,021 US201515326021A US2017214508A1 US 20170214508 A1 US20170214508 A1 US 20170214508A1 US 201515326021 A US201515326021 A US 201515326021A US 2017214508 A1 US2017214508 A1 US 2017214508A1
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Prior art keywords
prs
information
reference signal
transmission
subframe
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US15/326,021
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Hyunho Lee
Hanjun PARK
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LG Electronics Inc
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LG Electronics Inc
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Publication of US20170214508A1 publication Critical patent/US20170214508A1/en
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    • 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
    • H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0236—Assistance data, e.g. base station almanac
    • 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
    • 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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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 signalling, i.e. of overhead other than pilot signals
    • 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
    • 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
    • H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method for receiving a reference signal in a wireless communication system and an apparatus therefor.
  • Various devices e.g., smartphones, tablet PCs, etc.
  • technologies requiring Machine-to-Machine (M2M) communications and high data throughputs continue to appear and tend to be popularized.
  • a data amount necessary to be processed on a cellular network is increasing very fast.
  • technologies e.g., carrier aggregation technology, cognitive radio technology, etc.
  • technologies e.g., multi-antenna technology, multi-base station cooperation technology, etc.
  • a communication environment is evolved in a direction of increasing density of nodes accessible by a nearby user equipment.
  • a node means a fixed point capable of transmitting/receiving a radio signal to/from a user equipment by being equipped with at least one antenna.
  • a communication system equipped with nodes of high density can provide a user equipment with a communication service of high performance by cooperation between the nodes.
  • a multinode system performs a cooperative communication using a plurality of nodes that operate as a base station (or, access point), an antenna, an antenna group, a radio remote header (RRH) and a radio remote unit (RRU).
  • a plurality of the nodes in the multinode system are located in a manner of being spaced apart from each other over a predetermined interval.
  • a plurality of the nodes can be operated by at least one base station or a base station controller configured to control an operation of each node or schedule data to be transmitted/received through each node.
  • each of the nodes is connected to the base station or the base station controller configured to operate the corresponding node through a cable or a dedicated line.
  • Such a multinode system may be regarded as a sort of MIMO (multiple input multiple output) system in that distributed nodes can communicate with single or multiple users by transmitting/receiving different streams simultaneously. Yet, since the multinode system transmits a signal using the nodes distributed to various locations, a transmitting area supposed to be covered by each antenna is reduced in comparison with antennas provided to an existing centralized antenna system. Hence, compared to the existing system capable of implementing the MIMO technology in the centralized antenna system, the multinode system can reduce a transmit power required for each antenna to transmit a signal. Moreover, since a transmitting distance between an antenna and a user equipment is reduced, a pathloss is reduced and a fast transmission of data is enabled.
  • MIMO multiple input multiple output
  • transmission capacity and power efficiency of a cellular system can be raised and a communication performance of a relatively uniform quality can be met irrespective of a location of a user equipment within a cell.
  • base station(s) or base station controller(s) connected to a plurality of nodes cooperates for data transmission/reception, a signal loss generated from a transmitting process is reduced.
  • nodes located by being spaced apart from each other over a predetermined distance perform cooperative communication with a user equipment, correlation and interference between antennas are reduced.
  • SINR signal to interference-plus-noise ratio
  • the multinode system in order to extend a service coverage and improve channel capacity and SINR as well as reduce a base station establishment cost and a maintenance cost of a backhaul network in a next generation mobile communication system, the multinode system is used together with or substituted with the existing centralized antenna system, thereby emerging as a new base of a cellular communication.
  • An object of the present invention is to provide a method for receiving a reference signal in a wireless communication system and an operation related therewith.
  • a method for receiving a reference signal for positioning in a wireless communication system comprises the steps of receiving positioning reference signal (PRS) related configuration information transmitted from a plurality of antenna ports; and if the PRS related configuration information includes specific information, measuring a reference signal time difference (RSTD) by using only the PRS indicated by the PRS related configuration information.
  • PRS positioning reference signal
  • RSTD reference signal time difference
  • the method may comprise measuring a reference signal time difference (RSTD) by using a cell-specific reference signal (CRS) and the PRS indicated by the PRS related configuration information.
  • RSTD reference signal time difference
  • CRS cell-specific reference signal
  • the specific information may include at least one of information about an antenna port used for the PRS transmission, information about a subframe in which each antenna port transmits the PRS within a positioning occasion for the PRS transmission, information about an orthogonal cover code applied to each antenna port, or PRS RE mapping information for each antenna port.
  • the PRS may be multiplexed and mapped into REs for each of the plurality of antenna ports.
  • the method may further comprise reporting the measured RSTD to a serving cell.
  • PRS positioning reference signal
  • the processor may be configured to measure a reference signal time difference (RSTD) by using a cell-specific reference signal (CRS) and the PRS indicated by the PRS related configuration information.
  • RSTD reference signal time difference
  • CRS cell-specific reference signal
  • the specific information may include at least one of information about an antenna port used for the PRS transmission, information about a subframe in which each antenna port transmits the PRS within a positioning occasion for the PRS transmission, information about an orthogonal cover code applied to each antenna port, or PRS RE mapping information for each antenna port.
  • the PRS may be multiplexed and mapped to REs for each of the plurality of antenna ports.
  • the processor may be configured to report the measured RSTD to a serving cell.
  • reception of a reference signal and measurement of the reference signal can efficiently be performed in a wireless communication system.
  • FIG. 1 is diagram illustrating an example of a radio frame structure used in a wireless communication system
  • FIG. 2 is diagram illustrating an example of a downlink/uplink (DL/UL) slot structure in a wireless communication system
  • FIG. 3 is diagram illustrating an example of a downlink (DL) subframe structure used in a 3GPP LTE/LTE-A system
  • FIG. 4 is diagram illustrating an example of an uplink (UL) subframe structure used in a 3GPP LTE/LTE-A system
  • FIG. 5 is a diagram illustrating a PRS transmission structure
  • FIGS. 6 and 7 are diagrams illustrating RE mapping a PRS (positioning reference signal).
  • FIG. 8 is a diagram illustrating PRS RE mapping frequency shifted in accordance with physical cell ID
  • FIG. 9 is a diagram illustrating multi-antenna port PRS RE mapping according to CDM.
  • FIG. 10 is a diagram illustrating multi-antenna port PRS RE mapping according to TDM and FDM;
  • FIG. 11 is a diagram illustrating multi-antenna port PRS RE mapping according to TDM, FDM and CDM;
  • FIG. 12 is a diagram illustrating PRS RE mapping at MBSFN subframe
  • FIGS. 13 and 14 are diagrams examples of positioning occasion allocation for a plurality of TPs having the same physical cell ID
  • FIG. 15 is a diagram illustrating an operation according to one embodiment of the present invention.
  • FIG. 16 is a block diagram illustrating an apparatus for implementing the embodiment(s) of the present invention.
  • a user equipment is fixed or mobile.
  • the UE is a device that transmits and receives user data and/or control information by communicating with a base station (BS).
  • BS base station
  • the term ‘UE’ may be replaced with ‘terminal equipment’, ‘Mobile Station (MS)’, ‘Mobile Terminal (MT)’, ‘User Terminal (UT)’, ‘Subscriber Station (SS)’, ‘wireless device’, ‘Personal Digital Assistant (PDA)’, ‘wireless modem’, ‘handheld device’, etc.
  • a BS is typically a fixed station that communicates with a UE and/or another BS. The BS exchanges data and control information with a UE and another BS.
  • BS may be replaced with ‘Advanced Base Station (ABS)’, ‘Node B’, ‘evolved-Node B (eNB)’, ‘Base Transceiver System (BTS)’, ‘Access Point (AP)’, ‘Processing Server (PS)’, etc.
  • ABS Advanced Base Station
  • eNB evolved-Node B
  • BTS Base Transceiver System
  • AP Access Point
  • PS Processing Server
  • a node refers to a fixed point capable of transmitting/receiving a radio signal to/from a UE by communication with the UE.
  • Various eNBs can be used as nodes.
  • a node can be a BS, NB, eNB, Pico-cell eNB (PeNB), home eNB (HeNB), relay, repeater, etc.
  • a node may not be an eNB.
  • a node can be a radio remote head (RRH) or a radio remote unit (RRU). The RRH and RRU have power levels lower than that of the eNB.
  • RRH radio remote head
  • RRU radio remote unit
  • RRH/RRU Since the RRH or RRU (referred to as RRH/RRU hereinafter) is connected to an eNB through a dedicated line such as an optical cable in general, cooperative communication according to RRH/RRU and eNB can be smoothly performed compared to cooperative communication according to eNBs connected through a wireless link.
  • At least one antenna is installed per node.
  • An antenna may refer to an antenna port, a virtual antenna or an antenna group.
  • a node may also be called a point.
  • Unlink a conventional centralized antenna system (CAS) (i.e. single node system) in which antennas are concentrated in an eNB and controlled an eNB controller, plural nodes are spaced apart at a predetermined distance or longer in a multi-node system.
  • CAS centralized antenna system
  • the plural nodes can be managed by one or more eNBs or eNB controllers that control operations of the nodes or schedule data to be transmitted/received through the nodes.
  • Each node may be connected to an eNB or eNB controller managing the corresponding node via a cable or a dedicated line.
  • the same cell identity (ID) or different cell IDs may be used for signal transmission/reception through plural nodes.
  • each of the plural nodes operates as an antenna group of a cell.
  • the multi-node system can be regarded as a multi-cell (e.g., macro-cell/femto-cell/pico-cell) system.
  • a network configured by multiple cells is called a multi-tier network.
  • the cell ID of the RRH/RRU may be identical to or different from the cell ID of an eNB.
  • the RRH/RRU and eNB use different cell IDs, both the RRH/RRU and eNB operate as independent eNBs.
  • one or more eNBs or eNB controllers connected to plural nodes can control the plural nodes such that signals are simultaneously transmitted to or received from a UE through some or all nodes. While there is a difference between multi-node systems according to the nature of each node and implementation form of each node, multi-node systems are discriminated from single node systems (e.g. CAS, conventional MIMO systems, conventional relay systems, conventional repeater systems, etc.) since a plurality of nodes provides communication services to a UE in a predetermined time-frequency resource.
  • single node systems e.g. CAS, conventional MIMO systems, conventional relay systems, conventional repeater systems, etc.
  • a node refers to an antenna group spaced apart from another node by a predetermined distance or more, in general.
  • embodiments of the present invention which will be described below, can even be applied to a case in which a node refers to an arbitrary antenna group irrespective of node interval.
  • the embodiments of the preset invention are applicable on the assumption that the eNB controls a node composed of an H-pole antenna and a V-pole antenna.
  • a communication scheme through which signals are transmitted/received via plural transmit (Tx)/receive (Rx) nodes, signals are transmitted/received via at least one node selected from plural Tx/Rx nodes, or a node transmitting a downlink signal is discriminated from a node transmitting an uplink signal is called multi-eNB MIMO or CoMP (Coordinated Multi-Point Tx/Rx).
  • CoMP Coordinated Multi-Point Tx/Rx.
  • Coordinated transmission schemes from among CoMP communication schemes can be categorized into JP (Joint Processing) and scheduling coordination.
  • the former may be divided into JT (Joint Transmission)/JR (Joint Reception) and DPS (Dynamic Point Selection) and the latter may be divided into CS (Coordinated Scheduling) and CB (Coordinated Beamforming). DPS may be called DCS (Dynamic Cell Selection).
  • JP Joint Transmission
  • JR Joint Reception
  • DCS Coordinatd Beamforming
  • DPS refers to a communication scheme by which a signal is transmitted/received through a node selected from plural nodes according to a specific rule.
  • signal transmission reliability can be improved because a node having a good channel state between the node and a UE is selected as a communication node.
  • a cell refers to a specific geographical area in which one or more nodes provide communication services. Accordingly, communication with a specific cell may mean communication with an eNB or a node providing communication services to the specific cell.
  • a downlink/uplink signal of a specific cell refers to a downlink/uplink signal from/to an eNB or a node providing communication services to the specific cell.
  • a cell providing uplink/downlink communication services to a UE is called a serving cell.
  • channel status/quality of a specific cell refers to channel status/quality of a channel or a communication link generated between an eNB or a node providing communication services to the specific cell and a UE.
  • a UE can measure downlink channel state from a specific node using one or more CSI-RSs (Channel State Information Reference Signals) transmitted through antenna port(s) of the specific node on a CSI-RS resource allocated to the specific node.
  • CSI-RSs Channel State Information Reference Signals
  • neighboring nodes transmit CSI-RS resources on orthogonal CSI-RS resources.
  • CSI-RS resources are orthogonal, this means that the CSI-RS resources have different subframe configurations and/or CSI-RS sequences which specify subframes to which CSI-RSs are allocated according to CSI-RS resource configurations, subframe offsets and transmission periods, etc. which specify symbols and subcarriers carrying the CSI RSs.
  • PDCCH Physical Downlink Control Channel
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical Hybrid automatic repeat request Indicator Channel
  • PDSCH Physical Downlink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • PRACH Physical Random Access Channel
  • a time-frequency resource or a resource element (RE) which is allocated to or belongs to PDCCH/PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH, is referred to as a PDCCH/PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH RE or PDCCH/PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH resource.
  • transmission of PUCCH/PUSCH/PRACH by a UE is equivalent to transmission of uplink control information/uplink data/random access signal through or on PUCCH/PUSCH/PRACH.
  • transmission of PDCCH/PCFICH/PHICH/PDSCH by an eNB is equivalent to transmission of downlink data/control information through or on PDCCH/PCFICH/PHICH/PDSCH.
  • FIG. 1 illustrates an exemplary radio frame structure used in a wireless communication system.
  • FIG. 1( a ) illustrates a frame structure for frequency division duplex (FDD) used in 3GPP LTE/LTE-A and
  • FIG. 1( b ) illustrates a frame structure for time division duplex (TDD) used in 3GPP LTE/LTE-A.
  • FDD frequency division duplex
  • TDD time division duplex
  • a radio frame used in 3GPP LTE/LTE-A has a length of 10 ms (307200 Ts) and includes 10 subframes in equal size.
  • the 10 subframes in the radio frame may be numbered.
  • Each subframe has a length of 1 ms and includes two slots.
  • 20 slots in the radio frame can be sequentially numbered from 0 to 19.
  • Each slot has a length of 0.5 ms.
  • a time for transmitting a subframe is defined as a transmission time interval (TTI).
  • Time resources can be discriminated by a radio frame number (or radio frame index), subframe number (or subframe index) and a slot number (or slot index).
  • the radio frame can be configured differently according to duplex mode. Downlink transmission is discriminated from uplink transmission by frequency in FDD mode, and thus the radio frame includes only one of a downlink subframe and an uplink subframe in a specific frequency band. In TDD mode, downlink transmission is discriminated from uplink transmission by time, and thus the radio frame includes both a downlink subframe and an uplink subframe in a specific frequency band.
  • Table 1 shows DL-UL configurations of subframes in a radio frame in the TDD mode.
  • D denotes a downlink subframe
  • U denotes an uplink subframe
  • S denotes a special subframe.
  • the special subframe includes three fields of DwPTS (Downlink Pilot TimeSlot), GP (Guard Period), and UpPTS (Uplink Pilot TimeSlot).
  • DwPTS is a period reserved for downlink transmission
  • UpPTS is a period reserved for uplink transmission.
  • Table 2 shows special subframe configuration.
  • FIG. 2 illustrates an exemplary downlink/uplink slot structure in a wireless communication system. Particularly, FIG. 2 illustrates a resource grid structure in 3GPP LTE/LTE-A. A resource grid is present per antenna port.
  • a slot includes a plurality of OFDM (Orthogonal Frequency Division Multiplexing) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • An OFDM symbol may refer to a symbol period.
  • a signal transmitted in each slot may be represented by a resource grid composed of N RB DL/UL *N sc RB subcarriers and N symb DL/UL OFDM symbols.
  • N RB DL denotes the number of RBs in a downlink slot
  • N RB UL denotes the number of RBs in an uplink slot.
  • N RB DL and N RB UL respectively depend on a DL transmission bandwidth and a UL transmission bandwidth.
  • N symb DL denotes the number of OFDM symbols in the downlink slot and N symb UL denotes the number of OFDM symbols in the uplink slot.
  • N sc RB denotes the number of subcarriers constructing one RB.
  • An OFDM symbol may be called an SC-FDM (Single Carrier Frequency Division Multiplexing) symbol according to multiple access scheme.
  • the number of OFDM symbols included in a slot may depend on a channel bandwidth and the length of a cyclic prefix (CP).
  • CP cyclic prefix
  • a slot includes 7 OFDM symbols in the case of normal CP and 6 OFDM symbols in the case of extended CP.
  • FIG. 2 illustrates a subframe in which a slot includes 7 OFDM symbols for convenience, embodiments of the present invention can be equally applied to subframes having different numbers of OFDM symbols.
  • each OFDM symbol includes N RB DL/UL *N sc RB subcarriers in the frequency domain.
  • Subcarrier types can be classified into a data subcarrier for data transmission, a reference signal subcarrier for reference signal transmission, and null subcarriers for a guard band and a direct current (DC) component.
  • the null subcarrier for a DC component is a subcarrier remaining unused and is mapped to a carrier frequency (f0) during OFDM signal generation or frequency up-conversion.
  • the carrier frequency is also called a center frequency.
  • An RB is defined by N symb DL/UL (e.g., 7) consecutive OFDM symbols in the time domain and N sc RB (e.g., 12) consecutive subcarriers in the frequency domain.
  • N symb DL/UL e.g., 7
  • N sc RB e.g., 12
  • a resource composed by an OFDM symbol and a subcarrier is called a resource element (RE) or a tone.
  • an RB is composed of N symb DL/UL *N sc RB REs.
  • Each RE in a resource grid can be uniquely defined by an index pair (k, l) in a slot.
  • k is an index in the range of 0 to N symb DL/UL *N sc RB ⁇ 1 in the frequency domain and l is an index in the range of 0 to N symb DL/UL ⁇ 1.
  • a physical resource block (PRB) pair Two RBs that occupy N sc RB consecutive subcarriers in a subframe and respectively disposed in two slots of the subframe are called a physical resource block (PRB) pair. Two RBs constituting a PRB pair have the same PRB number (or PRB index).
  • a virtual resource block (VRB) is a logical resource allocation unit for resource allocation. The VRB has the same size as that of the PRB.
  • the VRB may be divided into a localized VRB and a distributed VRB depending on a mapping scheme of VRB into PRB.
  • N VRB DL N RB DL is obtained. Accordingly, according to the localized mapping scheme, the VRBs having the same VRB number are mapped into the PRBs having the same PRB number at the first slot and the second slot. On the other hand, the distributed VRBs are mapped into the PRBs through interleaving. Accordingly, the VRBs having the same VRB number may be mapped into the PRBs having different PRB numbers at the first slot and the second slot. Two PRBs, which are respectively located at two slots of the subframe and have the same VRB number, will be referred to as a pair of VRBs.
  • FIG. 3 illustrates a downlink (DL) subframe structure used in 3GPP LTE/LTE-A.
  • a DL subframe is divided into a control region and a data region.
  • a maximum of three (four) OFDM symbols located in a front portion of a first slot within a subframe correspond to the control region to which a control channel is allocated.
  • a resource region available for PDCCH transmission in the DL subframe is referred to as a PDCCH region hereinafter.
  • the remaining OFDM symbols correspond to the data region to which a physical downlink shared chancel (PDSCH) is allocated.
  • PDSCH physical downlink shared chancel
  • a resource region available for PDSCH transmission in the DL subframe is referred to as a PDSCH region hereinafter.
  • Examples of downlink control channels used in 3GPP LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), etc.
  • the PCFICH is transmitted at a first OFDM symbol of a subframe and carries information regarding the number of OFDM symbols used for transmission of control channels within the subframe.
  • the PHICH is a response of uplink transmission and carries an HARQ acknowledgment (ACK)/negative acknowledgment (NACK) signal.
  • ACK HARQ acknowledgment
  • NACK negative acknowledgment
  • the DCI contains resource allocation information and control information for a UE or a UE group.
  • the DCI includes a transport format and resource allocation information of a downlink shared channel (DL-SCH), a transport format and resource allocation information of an uplink shared channel (UL-SCH), paging information of a paging channel (PCH), system information on the DL-SCH, information about resource allocation of an upper layer control message such as a random access response transmitted on the PDSCH, a transmit control command set with respect to individual UEs in a UE group, a transmit power control command, information on activation of a voice over IP (VoIP), downlink assignment index (DAI), etc.
  • DL-SCH downlink shared channel
  • UL-SCH uplink shared channel
  • PCH paging information of a paging channel
  • system information on the DL-SCH information about resource allocation of an upper layer control message such as a random access response transmitted on the PDSCH
  • the transport format and resource allocation information of the DL-SCH are also called DL scheduling information or a DL grant and the transport format and resource allocation information of the UL-SCH are also called UL scheduling information or a UL grant.
  • the size and purpose of DCI carried on a PDCCH depend on DCI format and the size thereof may be varied according to coding rate.
  • Control information such as a hopping flag, information on RB allocation, modulation coding scheme (MCS), redundancy version (RV), new data indicator (NDI), information on transmit power control (TPC), cyclic shift demodulation reference signal (DMRS), UL index, channel quality information (CQI) request, DL assignment index, HARQ process number, transmitted precoding matrix indicator (TPMI), precoding matrix indicator (PMI), etc. is selected and combined based on DCI format and transmitted to a UE as DCI.
  • MCS modulation coding scheme
  • RV redundancy version
  • NDI new data indicator
  • TPC transmit power control
  • DMRS cyclic shift demodulation reference signal
  • CQI channel quality information
  • TPMI transmitted precoding matrix indicator
  • PMI precoding matrix indicator
  • a DCI format for a UE depends on transmission mode (TM) set for the UE.
  • TM transmission mode
  • only a DCI format corresponding to a specific TM can be used for a UE configured in the specific TM.
  • a PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
  • the CCE is a logical allocation unit used to provide the PDCCH with a coding rate based on a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups (REGs). For example, a CCE corresponds to 9 REGs and an REG corresponds to 4 REs.
  • 3GPP LTE defines a CCE set in which a PDCCH can be located for each UE.
  • a CCE set from which a UE can detect a PDCCH thereof is called a PDCCH search space, simply, search space.
  • An individual resource through which the PDCCH can be transmitted within the search space is called a PDCCH candidate.
  • search spaces for DCI formats may have different sizes and include a dedicated search space and a common search space.
  • the dedicated search space is a UE-specific search space and is configured for each UE.
  • the common search space is configured for a plurality of UEs. Aggregation levels defining the search space is as follows.
  • a PDCCH candidate corresponds to 1, 2, 4 or 8 CCEs according to CCE aggregation level.
  • An eNB transmits a PDCCH (DCI) on an arbitrary PDCCH candidate with in a search space and a UE monitors the search space to detect the PDCCH (DCI).
  • monitoring refers to attempting to decode each PDCCH in the corresponding search space according to all monitored DCI formats.
  • the UE can detect the PDCCH thereof by monitoring plural PDCCHs. Since the UE does not know the position in which the PDCCH thereof is transmitted, the UE attempts to decode all PDCCHs of the corresponding DCI format for each subframe until a PDCCH having the ID thereof is detected. This process is called blind detection (or blind decoding (BD)).
  • BD blind decoding
  • the eNB can transmit data for a UE or a UE group through the data region.
  • Data transmitted through the data region may be called user data.
  • a physical downlink shared channel (PDSCH) may be allocated to the data region.
  • a paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted through the PDSCH.
  • the UE can read data transmitted through the PDSCH by decoding control information transmitted through a PDCCH.
  • Information representing a UE or a UE group to which data on the PDSCH is transmitted, how the UE or UE group receives and decodes the PDSCH data, etc. is included in the PDCCH and transmitted.
  • a specific PDCCH is CRC (cyclic redundancy check)-masked having radio network temporary identify (RNTI) of “A” and information about data transmitted using a radio resource (e.g., frequency position) of “B” and transmission format information (e.g., transport block size, modulation scheme, coding information, etc.) of “C” is transmitted through a specific DL subframe
  • the UE monitors PDCCHs using RNTI information and a UE having the RNTI of “A” detects a PDCCH and receives a PDSCH indicated by “B” and “C” using information about the PDCCH.
  • a reference signal (RS) to be compared with a data signal is necessary for the UE to demodulate a signal received from the eNB.
  • a reference signal refers to a predetermined signal having a specific waveform, which is transmitted from the eNB to the UE or from the UE to the eNB and known to both the eNB and UE.
  • the reference signal is also called a pilot.
  • Reference signals are categorized into a cell-specific RS shared by all UEs in a cell and a modulation RS (DM RS) dedicated for a specific UE.
  • DM RS modulation RS
  • a DM RS transmitted by the eNB for demodulation of downlink data for a specific UE is called a UE-specific RS.
  • Both or one of DM RS and CRS may be transmitted on downlink.
  • an RS for channel measurement needs to be additionally provided because the DM RS transmitted using the same precoder as used for data can be used for demodulation only.
  • CSI-RS corresponding to an additional RS for measurement is transmitted to the UE such that the UE can measure channel state information.
  • CSI-RS is transmitted in each transmission period corresponding to a plurality of subframes based on the fact that channel state variation with time is not large, unlike CRS transmitted per subframe.
  • FIG. 4 illustrates an exemplary uplink subframe structure used in 3GPP LTE/LTE-A.
  • a UL subframe can be divided into a control region and a data region in the frequency domain.
  • One or more PUCCHs (physical uplink control channels) can be allocated to the control region to carry uplink control information (UCI).
  • One or more PUSCHs (Physical uplink shared channels) may be allocated to the data region of the UL subframe to carry user data.
  • subcarriers spaced apart from a DC subcarrier are used as the control region.
  • subcarriers corresponding to both ends of a UL transmission bandwidth are assigned to UCI transmission.
  • the DC subcarrier is a component remaining unused for signal transmission and is mapped to the carrier frequency f0 during frequency up-conversion.
  • a PUCCH for a UE is allocated to an RB pair belonging to resources operating at a carrier frequency and RBs belonging to the RB pair occupy different subcarriers in two slots. Assignment of the PUCCH in this manner is represented as frequency hopping of an RB pair allocated to the PUCCH at a slot boundary. When frequency hopping is not applied, the RB pair occupies the same subcarrier.
  • the PUCCH can be used to transmit the following control information.
  • the quantity of control information (UCI) that a UE can transmit through a subframe depends on the number of SC-FDMA symbols available for control information transmission.
  • the SC-FDMA symbols available for control information transmission correspond to SC-FDMA symbols other than SC-FDMA symbols of the subframe, which are used for reference signal transmission.
  • SRS sounding reference signal
  • the last SC-FDMA symbol of the subframe is excluded from the SC-FDMA symbols available for control information transmission.
  • a reference signal is used to detect coherence of the PUCCH.
  • the PUCCH supports various formats according to information transmitted thereon.
  • Table 4 shows the mapping relationship between PUCCH formats and UCI in LTE/LTE-A.
  • N/A N/A SR (Scheduling Request) 1a BPSK 1 ACK/NACK or One codeword SR + ACK/NACK 1b QPSK 2 ACK/NACK or Two codeword SR + ACK/NACK 2 QPSK 20 CQI/PMI/RI Joint coding ACK/NACK (extended CP) 2a QPSK + 21 CQI/PMI/RI + Normal CP BPSK ACK/NACK only 2b QPSK + 22 CQI/PMI/RI + Normal CP QPSK ACK/NACK only 3 QPSK 48 ACK/NACK or SR + ACK/NACK or CQI/PMI/RI + ACK/NACK
  • PUCCH formats 1/1a/1b are used to transmit ACK/NACK information
  • PUCCH format 2/2a/2b are used to carry CSI such as CQI/PMI/RI
  • PUCCH format 3 is used to transmit ACK/NACK information.
  • the UE may be configured to receive PRS (positioning reference signal) transmission related information of base stations from a higher layer signal, and may transmit a reference signal time difference (RSTD) which is a difference between a reception time of a PRS transmitted from a reference base station and a reception time of a PRS transmitted from a neighboring base station to a base station or network by measuring PRS transmitted from cells in the periphery of the UE, and the network calculates a position of the UE by using RSTD and other information.
  • PRS positioning reference signal
  • RSTD reference signal time difference
  • A-GNSS Assisted Global Navigation Satellite System
  • E-CID Enhanced Cell-ID
  • UTDOA Uplink Time Difference of Arrival
  • an LPP LTE positioning protocol
  • OTDOA-ProvideAssistanceData having the following configuration through IE (information element).
  • OTDOA-ProvideAssistanceData SEQUENCE ⁇ otdoa-ReferenceCellInfo OTDOA-ReferenceCellInfoOPTIONAL, -- Need ON otdoa-NeighbourCellInfo OTDOA-NeighbourCellInfoList OPTIONAL, -- Need ON otdoa-Error OTDOA-Error OPTIONAL, -- Need ON ... ⁇ -- ASN1STOP
  • OTDOA-ReferenceCellInfo means a cell which is a reference of RSTD measurement, and is configured as follows.
  • OTDOA-ReferenceCellInfo SEQUENCE ⁇ physCellId INTEGER (0..503), cellGlobalId ECGI OPTIONAL, -- Need ON earfcnRef ARFCN-ValueEUTRA OPTIONAL, --Cond NotSameAsServ0 antennaPortConfig ENUMERATED ⁇ ports1-or-2, ports4, ... ⁇ OPTIONAL, -- Cond NotSameAsServ1 cpLength ENUMERATED ⁇ normal, extended, ...
  • OTDOA-NeighbourCellInfoList :: SEQUENCE (SIZE (1..maxFreqLayers)) OF OTDOA-NeighbourFreqInfo
  • OTDOA-NeighbourFreqInfo :: SEQUENCE (SIZE (1..24)) OF OTDOA- NeighbourCellInfoElement
  • OTDOA-NeighbourCellInfoElement :: SEQUENCE ⁇ physCellId INTEGER (0..503), cellGlobalId ECGI OPTIONAL, -- Need ON earfcn ARFCN-ValueEUTRA OPTIONAL, -- Cond NotSameAsRef0 cpLength ENUMERATED ⁇ normal, extended, ... ⁇ OPTIONAL, -- Cond NotSameAsRef1 prsInfo PRS-Info OPTIONAL, -- Cond NotSameAsRef2 antennaPortConfig ENUMERATED ⁇ ports-1-
  • PRS-Info which is IE included in OTDOA-ReferenceCellInfo and OTDOA-NeighbourCellInfo has PRS information, and is specifically configured, as follows, as PRS Bandwidth, PRS Configuration Index (IPRS), Number of Consecutive Downlink Subframes, and PRS Muting Information.
  • PRS Bandwidth PRS Bandwidth
  • IPRS PRS Configuration Index
  • Number of Consecutive Downlink Subframes Number of Consecutive Downlink Subframes
  • PRS Muting Information PRS Muting Information
  • PRS-Info :: SEQUENCE ⁇ prs-Bandwidth ENUMERATED ⁇ n6, n15, n25, n50, n75, n100, ... ⁇ , prs-ConfigurationIndex INTEGER (0..4095), numDL-Frames ENUMERATED ⁇ sf-1, sf-2, sf-4, sf-6, ... ⁇ , ..., prs-MutingInfo-r9 CHOICE ⁇ po2-r9 BIT STRING (SIZE(2)), po4-r9 BIT STRING (SIZE(4)), po8-r9 BIT STRING (SIZE(8)), po16-r9 BIT STRING (SIZE(16)), ... ⁇ OPTIONAL -- Need OP ⁇ -- ASN1STOP
  • PRS Periodicity and PRS Subframe Offset are determined in accordance with a value of PRS Configuration Index (IPRS), and their correlation is as follows.
  • the PRS has a transmission occasion, that is, a positioning occasion at a period of 160, 320, 640, or 1280 ms, and may be transmitted for N DL subframes consecutive for the positioning occasion.
  • N may have a value of 1, 2, 4 or 6.
  • the PRS may be transmitted substantially at the positioning occasion, the PRS may be muted for inter-cell interference control cooperation. Information on such PRS muting is signaled to the UE as prs-MutingInfo.
  • a transmission bandwidth of the PRS may be configured independently unlike a system bandwidth of a serving base station, and is transmitted to a frequency band of 6, 15, 25, 50, 75 or 100 resource blocks (RBs).
  • Transmission sequences of the PRS are generated by initializing a pseudo-random sequence generator for every OFDM symbol using a function of a slot index, an OFDM symbol index, a cyclic prefix (CP) type, and a cell ID.
  • the generated transmission sequences of the PRS are mapped to resource elements (REs) depending on a normal CP or an extended CP as shown in FIG. 6 (normal CP) and FIG. 7 (extended CP).
  • a position of the mapped REs may be shifted on the frequency axis, and a shift value is determined by a cell ID.
  • the positions of the REs for transmission of the PRS shown in FIGS. 6 and 7 correspond to the case that the frequency shift is 0.
  • the PRS configuration information of the neighboring cells includes a slot offset and a subframe offset of the neighboring cells and the reference cell, an expected RSTD, and a level of uncertainty of the expected RSTD to support determination of the UE when the UE determines a timing point and a level of time window used to search for the PRS to detect the PRS transmitted from the neighboring cell.
  • the aforementioned positioning schemes of the related art are already supported by the 3GPP UTRA and E-UTRAN standard (for example, (LTE Rel-9), higher accuracy is recently required for an in-building positioning scheme. That is, although the positioning schemes of the related art may commonly be applied to outdoor/indoor environments, in case of E-CID scheme, general positioning accuracy is known as 150 m in a non-LOS (NLOS) environment and as 50 m in a LOS environment. Also, the OTDOA scheme based on the PRS has a limit in a positioning error, which may exceed 100 m, due to an eNB synchronization error, a multipath propagation error, a quantization error in RSTD measurement of a UE, and a timing offset estimation error. Also, since a GNSS receiver is required in case of the A-GNSS scheme, the A-GNSS scheme has a limit in complexity and battery consumption, and has a restriction in using in-building positioning.
  • a cellular network basically transmits a specific pilot signal (for example, specific reference signal type identifiable separately per base station/TP (transmission point)) to the UE, and the UE calculates a positioning related estimation value (for example, OTDOA and RSTD estimation value) based on a specific positioning scheme by measuring each pilot signal and then reports the calculated value to the base station, whereby a method for calculating position information of the corresponding UE at a base station terminal is considered.
  • a specific pilot signal for example, specific reference signal type identifiable separately per base station/TP (transmission point)
  • a positioning related estimation value for example, OTDOA and RSTD estimation value
  • the PRS is designed such that the PRS is set to a single antenna port as shown in FIGS. 6 and 7 to calculate a positioning related estimation value of the UE.
  • a method for transmitting the PRS from a plurality of antenna ports may be considered.
  • a detailed method for transmitting the PRS from a plurality of antenna ports will be suggested.
  • PRS RE mapping according to the 3GPP LTE standard may be shifted on the frequency axis in accordance with physical cell ID as shown in FIG. 8 .
  • the UE performs positioning related measurement by using the PRS transmitted from neighboring base stations/TPs, and to assist the positioning related measurement of the UE, the PRS is mapped into different REs in accordance with the physical cell ID to minimize interference caused by the PRS transmitted from the neighboring base stations/TPs. Therefore, it is not preferable that the PRS is transmitted to REs which will be used by other base station/TP in addition to REs designated to be used for PRS transmission by a specific base station/TP.
  • One embodiment of the present invention suggests that various multiplexing schemes should be considered to define a plurality of antenna ports for the PRS.
  • FIG. 9 is a diagram illustrating PRS RE mapping through multi-antenna ports to which CDM (code division multiplexing) is applied.
  • CDM code division multiplexing
  • an OCC for example, walsh code
  • a code multiplied by RE corresponding to each antenna port may be used as a code multiplied by RE corresponding to each antenna port.
  • the OCC multiplied by the PRS is mapped in a first frequency index mode in FIG. 9
  • the OCC may be mapped in a first time mode or random mode as a modified example of this embodiment.
  • mapping patterns for mapping the orthogonal code into each antenna port should be the same as one another.
  • the number of REs to which the OCC is applied within one subframe may be reduced.
  • RE mapping per antenna port and the mapping patterns for the OCC applied to each antenna port may be designated previously, or may be configured by the base station for the UE, which will perform positioning related estimation, through a higher layer (for example, RRC signaling) within a given set.
  • the aforementioned CDM mode to which OCC is applied and the aforementioned FDM+TDM+CDM mode may similarly be applied to even the case that PRS transmission is performed at the MBSFN subframe.
  • RE mapping per antenna port and the mapping patterns for the OCC applied to each antenna port may be designated previously, or may be configured by the base station for the UE, which will perform positioning related estimation, through a higher layer (for example, RRC signaling) within a given set.
  • TP such as a small cell may transmit the PRS and the UE may perform positioning related measurement.
  • a transmission sequence of the PRS is the same as a shift value on the frequency axis related to RE mapping of the PRS, and the UE may have a difficulty in identifying RRH that has transmitted the PRS if a plurality of RRHs transmit the PRS at the same positioning occasion.
  • PRS transmission period and offset may be transmitted by being divided from each other per TP as shown in FIG. 13 .
  • this method causes a lot of positioning occasions as the number of TPs is increased, whereby excessive overhead may be caused.
  • antenna ports are divided per TP as shown in FIG. 14( a ) , whereby the PRS may simultaneously be transmitted at the subframe within the same positioning occasion.
  • the aforementioned CDM mode or the aforementioned TDM+FDM mode or the aforementioned TDM+FDM+CDM mode may be applied such that the UE may identify each antenna port.
  • the UE may perform positioning related measurement for all antenna ports designated as PRS transmission antenna ports at the positioning occasion corresponding to corresponding physical cell ID.
  • the PRS may be transmitted at only a subframe scheduled per antenna port corresponding to each TP among subframes within the same positioning occasion as shown in FIG. 14( b ) .
  • an antenna port used for PRS transmission may be designated per subframe and configured for the UE.
  • a given number of subframes sequentially determined per TP may be used in turn to transmit the PRS.
  • the UE may be configured to perform and report positioning related measurement per TP.
  • the above suggestions have been described for the case that a plurality of TPs having the same physical cell ID transmit multi-antenna port PRS, the suggestions may be applied to even the case that a plurality of TPs having different physical cell IDs desire to share the same positioning occasion by sharing one PRS configuration index.
  • PRS-Info :: SEQUENCE ⁇ prs-Bandwidth ENUMERATED ⁇ n6, n15, n25, n50, n75, n100, ... ⁇ , prs-ConfigurationIndex INTEGER (0..4095), numDL-Frames ENUMERATED ⁇ sf-1, sf-2, sf-4, sf-6, ... ⁇ , prs-APConfig ENUMERATED ⁇ p1, p2, p3, p4, p1-and-p2, p3-and- p4, ...
  • prs-SFPatternInfo CHOICE ⁇ sf2 BIT STRING (SIZE(2)), sf4 BIT STRING (SIZE(4)), sf6 BIT STRING (SIZE(6)), ... ⁇ OPTIONAL, prs-OCCConfig ENUMERATED ⁇ OCCpattern1, OCCpattern2, OCCpattern3, ... ⁇ OPTIONAL, prs-RePatternInfo ENUMERATED ⁇ Repattern1, Repattern2, Repattern3, ...
  • prs-APConfig is an indicator that includes information on an antenna port used for PRS transmission.
  • prs-SFPatternInfo is an indicator that includes subframe information which will transmit PRS to a corresponding antenna port within positioning occasion.
  • prs-OCCConfig is an indicator that includes OCC information applied to a corresponding antenna port, and prs-RePatternInfo is an indicator that includes PRS RE mapping information on a corresponding antenna port.
  • the above signaling may be configured to include PRS-Info per TP, or may be configured to use one PRS-Info for a plurality of TPs but include parameters identified per TP.
  • the UE performs positioning related measurement by using the PRS only.
  • an explicit signal indicating that positioning related measurement should be performed by the PRS only may be defined together with the above parameter, whereby the UE performs positioning related measurement by using the PRS only if the corresponding explicit signal is given.
  • the UE may use the PRS or may use the PRS and the CRS together.
  • the UE which can use these two methods may perform RSTD measurement by determining whether to use the PRS only or both the PRS and the CRS.
  • LTE Rel-9 OTDOA based positioning although a homogeneous network (that is, macro eNB exists as a serving cell) has been considered, a heterogeneous network that small cells coexist is recently considered. Particularly, if a plurality of small cells (for example, femto cells) that is associated with one macro cell and uses the same physical cell ID exist, small cells at different positions transmit the CRS generated by the same physical cell ID. If RSTD measurement based on the CRS is used for RSTD measurement for a specific cell, accuracy of RSTD measurement may be reduced.
  • small cells for example, femto cells
  • the CRS is used for RSTD measurement even in case of a cell that does not transmit the CRS like a device (for example, beacon that transmits PRS only) that transmits PRS only, accuracy of RSTD measurement may be reduced.
  • a signal indicating whether a corresponding cell may use the CRS may be defined, and the UE which has received this signal may perform RSTD measurement by using the CRS of the corresponding cell or without using the CRS depending on interpretation.
  • the UE may perform the RSTD measurement by using a third reference signal of the cell corresponding to the CRS together with the PRS.
  • prs-APConfig prs-SFPatternInfo
  • prs-OCCConfig prs-RePatternInfo
  • the aforementioned various multiplexing modes for example, CDM, TDM+FDM, and CDM+TDM+FDM
  • CDM, TDM+FDM, and CDM+TDM+FDM may be applied to only a specific time/frequency domain or subframe set, which has been defined or signaled previously.
  • a mapping relationship between a subframe within the positioning occasion and a specific antenna port for transmitting the PRS may be defined previously or configured through signaling.
  • a mapping relationship between the positioning occasion and a specific antenna port for transmitting the PRS may be defined previously or configured through signaling.
  • a mapping relationship between a specific value generated by combination of subframe index and physical cell ID (or virtual cell ID) within the positioning occasion and a specific antenna port for transmitting the PRS may be defined/scheduled previously or configured through signaling. This configuration may also be applied to only a specific time/frequency domain or subframe set, which has been defined or signaled previously.
  • a rule may be defined to notify the UE of information (or information on rules of the suggested methods) as to application of the suggested methods, from a base station/position server through signaling (for example, physical layer signal or higher layer signal) which is previously defined.
  • FIG. 15 illustrates an operation according to one embodiment of the present invention.
  • FIG. 15 relates to a method for receiving a reference signal for positioning in a wireless communication system.
  • a UE 151 may receive positioning reference signal (PRS) related configuration information transmitted from a plurality of antenna ports (S 1510 ).
  • the UE may detect or measure the PRS by using the PRS related configuration information (S 1520 ).
  • the PRS may be mapped into resource elements (REs) for each of the plurality of antenna ports by multiplexing.
  • PRS positioning reference signal
  • the PRS may be mapped into a specific RE within OFDM symbols, into which the PRS is not mapped at a non-MBSFN subframe, at an MBSFN subframe.
  • An orthogonal cover code for code division multiplexing (CDM) may be used for mapping of the RE, and may be designated for each of the plurality of antenna ports.
  • the UE may receive information on the orthogonal cover code for each of the plurality of antenna ports.
  • the plurality of antenna ports may relate to a plurality of transmission devices. If the plurality of transmission devices use the same physical cell ID, each transmission device may transmit the PRS through different ones among the plurality of antenna ports. In this case, the UE may measure the PRS for each of the plurality of transmission devices.
  • the PRS related configuration information may include at least one of antenna port information used for the PRS transmission, subframe information for transmitting the PRS from each antenna port within a positioning occasion for the PRS transmission, orthogonal cover code information applied to each antenna port, and PRS RE mapping information for each antenna port.
  • the UE may report a detection or measurement result of the PRS (S 1530 ).
  • the measurement result of the PRS may include a measurement result of the PRS for each of the plurality of transmission devices.
  • the embodiment related to FIG. 15 may include at least a part of the aforementioned embodiment(s) alternatively or additionally.
  • FIG. 16 is a block diagram of a transmitting device 10 and a receiving device 20 configured to implement exemplary embodiments of the present invention.
  • the transmitting device 10 and the receiving device 20 respectively include radio frequency (RF) units 13 and 23 for transmitting and receiving radio signals carrying information, data, signals, and/or messages, memories 12 and 22 for storing information related to communication in a wireless communication system, and processors 11 and 21 connected operationally to the RF units 13 and 23 and the memories 12 and 22 and configured to control the memories 12 and 22 and/or the RF units 13 and 23 so as to perform at least one of the above-described embodiments of the present invention.
  • RF radio frequency
  • the memories 12 and 22 may store programs for processing and control of the processors 11 and 21 and may temporarily storing input/output information.
  • the memories 12 and 22 may be used as buffers.
  • the processors 11 and 21 control the overall operation of various modules in the transmitting device 10 or the receiving device 20 .
  • the processors 11 and 21 may perform various control functions to implement the present invention.
  • the processors 11 and 21 may be controllers, microcontrollers, microprocessors, or microcomputers.
  • the processors 11 and 21 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • firmware or software may be configured to include modules, procedures, functions, etc. performing the functions or operations of the present invention.
  • Firmware or software configured to perform the present invention may be included in the processors 11 and 21 or stored in the memories 12 and 22 so as to be driven by the processors 11 and 21 .
  • the processor 11 of the transmitting device 10 is scheduled from the processor 11 or a scheduler connected to the processor 11 and codes and modulates signals and/or data to be transmitted to the outside.
  • the coded and modulated signals and/or data are transmitted to the RF unit 13 .
  • the processor 11 converts a data stream to be transmitted into K layers through demultiplexing, channel coding, scrambling and modulation.
  • the coded data stream is also referred to as a codeword and is equivalent to a transport block which is a data block provided by a MAC layer.
  • One transport block (TB) is coded into one codeword and each codeword is transmitted to the receiving device in the form of one or more layers.
  • the RF unit 13 may include an oscillator.
  • the RF unit 13 may include Nt (where Nt is a positive integer) transmit antennas.
  • a signal processing process of the receiving device 20 is the reverse of the signal processing process of the transmitting device 10 .
  • the RF unit 23 of the receiving device 10 receives RF signals transmitted by the transmitting device 10 .
  • the RF unit 23 may include Nr receive antennas and frequency down-converts each signal received through receive antennas into a baseband signal.
  • the RF unit 23 may include an oscillator for frequency down-conversion.
  • the processor 21 decodes and demodulates the radio signals received through the receive antennas and restores data that the transmitting device 10 wishes to transmit.
  • the RF units 13 and 23 include one or more antennas.
  • An antenna performs a function of transmitting signals processed by the RF units 13 and 23 to the exterior or receiving radio signals from the exterior to transfer the radio signals to the RF units 13 and 23 .
  • the antenna may also be called an antenna port.
  • Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna element.
  • a signal transmitted through each antenna cannot be decomposed by the receiving device 20 .
  • a reference signal (RS) transmitted through an antenna defines the corresponding antenna viewed from the receiving device 20 and enables the receiving device 20 to perform channel estimation for the antenna, irrespective of whether a channel is a single RF channel from one physical antenna or a composite channel from a plurality of physical antenna elements including the antenna.
  • RS reference signal
  • an antenna is defined such that a channel transmitting a symbol on the antenna may be derived from the channel transmitting another symbol on the same antenna.
  • An RF unit supporting a MIMO function of transmitting and receiving data using a plurality of antennas may be connected to two or more antennas.
  • a UE serves as the transmission device 10 on uplink and as the receiving device 20 on downlink.
  • an eNB serves as the receiving device 20 on uplink and as the transmission device 10 on downlink.
  • the transmitting device and/or the receiving device may be configured as a combination of one or more embodiments of the present invention.
  • the present invention may be used for a wireless communication apparatus such as a user equipment (UE), a relay and an eNB.
  • UE user equipment
  • eNB evolved Node B

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KR20170049494A (ko) 2017-05-10
CN106716899B (zh) 2020-07-28
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WO2016032219A1 (fr) 2016-03-03
US20170289948A1 (en) 2017-10-05

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