WO2017026672A1 - Procédé de réception ou d'émission d'un signal de référence pour détermination de position dans un système de communications sans fil et dispositif à cet effet - Google Patents

Procédé de réception ou d'émission d'un signal de référence pour détermination de position dans un système de communications sans fil et dispositif à cet effet Download PDF

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Publication number
WO2017026672A1
WO2017026672A1 PCT/KR2016/007569 KR2016007569W WO2017026672A1 WO 2017026672 A1 WO2017026672 A1 WO 2017026672A1 KR 2016007569 W KR2016007569 W KR 2016007569W WO 2017026672 A1 WO2017026672 A1 WO 2017026672A1
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prs
crs
cell
measurement
reference signal
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PCT/KR2016/007569
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English (en)
Korean (ko)
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이현호
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • 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 more particularly, to a method for receiving or transmitting a reference signal for position determination in a wireless communication system and an apparatus therefor.
  • a node is a fixed point capable of transmitting / receiving a radio signal with a user device having one or more antennas.
  • a communication system having a high density of nodes can provide higher performance communication services to user equipment by cooperation between nodes.
  • This multi-node cooperative communication method in which a plurality of nodes communicate with a user equipment using the same time-frequency resources, is more efficient than a conventional communication method in which each node operates as an independent base station to communicate with a user equipment without mutual cooperation. It has much better performance in data throughput.
  • each node cooperates using a plurality of nodes, acting as base stations or access points, antennas, antenna groups, radio remote headers (RRHs), radio remote units (RRUs). Perform communication.
  • the plurality of nodes are typically located more than a certain distance apart.
  • the plurality of nodes may be managed by one or more base stations or base station controllers that control the operation of each node or schedule data to be transmitted / received through each node.
  • Each node is connected to a base station or base station controller that manages the node through a cable or dedicated line.
  • Such a multi-node system can be viewed as a kind of multiple input multiple output (MIMO) system in that distributed nodes can simultaneously communicate with a single or multiple user devices by transmitting and receiving different streams.
  • MIMO multiple input multiple output
  • the multi-node system transmits signals using nodes distributed in various locations, the transmission area that each antenna should cover is reduced as compared to the antennas provided in the existing centralized antenna system. Therefore, compared to the existing system implementing the MIMO technology in the centralized antenna system, in the multi-node system, the transmission power required for each antenna to transmit a signal can be reduced.
  • the transmission distance between the antenna and the user equipment is shortened, path loss is reduced, and high-speed data transmission is possible.
  • the transmission capacity and power efficiency of the cellular system can be increased, and communication performance of relatively uniform quality can be satisfied regardless of the position of the user equipment in the cell.
  • the base station (s) or base station controller (s) connected to the plurality of nodes cooperate with data transmission / reception, signal loss occurring in the transmission process is reduced.
  • the correlation (correlation) and interference between the antennas are reduced. Therefore, according to the multi-node cooperative communication scheme, a high signal to interference-plus-noise ratio (SINR) can be obtained.
  • SINR signal to interference-plus-noise ratio
  • the multi-node system is designed to reduce the cost of base station expansion and backhaul network maintenance in the next generation mobile communication system, and to increase service coverage and channel capacity and SINR. In parallel with or in place of a centralized antenna system, it is emerging as a new foundation for cellular communication.
  • the present invention proposes a method for positioning based on reference signal.
  • the method is performed by a terminal, receiving auxiliary data for position determination, the auxiliary data is a reference cell and Positioning information related to a positioning reference signal (PRS) for neighboring cells; Using the ancillary data, receiving a PRS or a cell-specific reference signal (CRS) of the reference cell and a PRS or CRS of the neighbor cells to calculate a reference signal time difference (RSTD) measurement value; And reporting the measured value to a location server, and if a specific field of PRS related configuration information for the reference cell or the neighboring cells indicates a predetermined value, CRS of the reference cell or the neighboring cells. Can be excluded from the measurement.
  • PRS positioning reference signal
  • CRSTD reference signal time difference
  • PRS related configuration information of a neighbor cell that does not transmit a CRS among the neighbor cells may include a specific field indicating the previously promised value.
  • the method may further include reporting to the location server whether the PRS or the CRS was used for the measurement or whether the PRS and the CRS were used together for the measurement.
  • the method may further comprise reporting capability information to the location server as to whether the terminal can use PRS or CRS for the measurement.
  • the assistance data may indicate that the PRS of the reference cell can be used for RSTD measurement.
  • the specific field may be a physical layer cell identifier field.
  • a terminal configured to perform reference signal measurement for position determination in a wireless communication system according to another embodiment of the present invention, the terminal comprising: a transmitter; receiving set; And a processor configured to control the transmitter and the receiver, the processor receiving auxiliary data for positioning, the auxiliary data including positioning reference signal (PRS) related configuration information for the reference cell and neighbor cells.
  • PRS positioning reference signal
  • RST reference signal time difference
  • PRS related configuration information of a neighbor cell that does not transmit a CRS among the neighbor cells may include a specific field indicating the previously promised value.
  • the processor may be configured to report to the location server whether the PRS or the CRS was used for the measurement or whether the PRS and the CRS were used together for the measurement.
  • the processor may be configured to report capability information to the location server as to whether the terminal can use PRS or CRS for the measurement.
  • the assistance data may indicate that the PRS of the reference cell can be used for RSTD measurement.
  • the specific field may be a physical layer cell identifier field.
  • FIG. 1 illustrates an example of a radio frame structure used in a wireless communication system.
  • FIG. 2 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
  • FIG 3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.
  • FIG. 4 illustrates an example of an uplink (UL) subframe structure used in a 3GPP LTE / LTE-A system.
  • FIG. 6 and 7 illustrate RE mapping of a positioning reference signal (PRS).
  • PRS positioning reference signal
  • FIG. 9 shows a block diagram of an apparatus for implementing an embodiment (s) of the present invention.
  • a user equipment may be fixed or mobile, and various devices which transmit and receive user data and / or various control information by communicating with a base station (BS) belong to this.
  • the UE may be a terminal equipment (MS), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), or a wireless modem. It may be called a modem, a handheld device, or the like.
  • a BS generally refers to a fixed station communicating with the UE and / or another BS, and communicates with the UE and another BS to exchange various data and control information.
  • BS includes Advanced Base Station (ABS), Node-B (NB), evolved-NodeB (eNB), Base Transceiver System (BTS), Access Point, Processing Server (PS), Transmission Point (TP) May be called in other terms.
  • ABS Advanced Base Station
  • NB Node-B
  • eNB evolved-NodeB
  • BTS Base Transceiver System
  • PS Processing Server
  • TP Transmission Point
  • BS is collectively referred to as eNB.
  • a node refers to a fixed point capable of transmitting / receiving a radio signal by communicating with a user equipment.
  • Various forms of eNBs may be used as nodes regardless of their name.
  • the node may be a BS, an NB, an eNB, a pico-cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, and the like.
  • the node may not be an eNB.
  • it may be a radio remote head (RRH), a radio remote unit (RRU).
  • RRHs, RRUs, etc. generally have a power level lower than the power level of the eNB.
  • RRH or RRU, RRH / RRU is generally connected to an eNB by a dedicated line such as an optical cable
  • RRH / RRU and eNB are generally compared to cooperative communication by eNBs connected by a wireless line.
  • cooperative communication can be performed smoothly.
  • At least one antenna is installed at one node.
  • the antenna may mean a physical antenna or may mean an antenna port, a virtual antenna, or an antenna group.
  • Nodes are also called points. Unlike conventional centralized antenna systems (ie, single node systems) where antennas are centrally located at base stations and controlled by one eNB controller, in a multi-node system A plurality of nodes are typically located farther apart than a predetermined interval.
  • the plurality of nodes may be managed by one or more eNBs or eNB controllers that control the operation of each node or schedule data to be transmitted / received through each node.
  • Each node may be connected to the eNB or eNB controller that manages the node through a cable or dedicated line.
  • the same cell identifier (ID) may be used or different cell IDs may be used for signal transmission / reception to / from a plurality of nodes.
  • ID cell identifier
  • each of the plurality of nodes behaves like some antenna group of one cell.
  • a multi-node system may be regarded as a multi-cell (eg, macro-cell / femto-cell / pico-cell) system.
  • the network formed by the multiple cells is particularly called a multi-tier network.
  • the cell ID of the RRH / RRU and the cell ID of the eNB may be the same or may be different.
  • both the RRH / RRU and the eNB operate as independent base stations.
  • one or more eNB or eNB controllers connected with a plurality of nodes may control the plurality of nodes to simultaneously transmit or receive signals to the UE via some or all of the plurality of nodes.
  • multi-node systems depending on the identity of each node, the implementation of each node, etc., these multi-nodes in that multiple nodes together participate in providing communication services to the UE on a given time-frequency resource.
  • the systems are different from single node systems (eg CAS, conventional MIMO system, conventional relay system, conventional repeater system, etc.).
  • embodiments of the present invention regarding a method for performing data cooperative transmission using some or all of a plurality of nodes may be applied to various kinds of multi-node systems.
  • a node generally refers to an antenna group spaced apart from another node by a predetermined distance or more
  • embodiments of the present invention described later may be applied even when the node means any antenna group regardless of the interval.
  • the eNB may control the node configured as the H-pol antenna and the node configured as the V-pol antenna, and thus embodiments of the present invention may be applied. .
  • a communication scheme that enables different nodes to receive the uplink signal is called multi-eNB MIMO or CoMP (Coordinated Multi-Point TX / RX).
  • Cooperative transmission schemes among such cooperative communication between nodes can be largely classified into joint processing (JP) and scheduling coordination.
  • the former may be divided into joint transmission (JT) / joint reception (JR) and dynamic point selection (DPS), and the latter may be divided into coordinated scheduling (CS) and coordinated beamforming (CB).
  • DPS is also called dynamic cell selection (DCS).
  • JP Joint Processing Protocol
  • JR refers to a communication scheme in which a plurality of nodes receive the same stream from the UE.
  • the UE / eNB combines the signals received from the plurality of nodes to recover the stream.
  • the reliability of signal transmission may be improved by transmit diversity.
  • DPS in JP refers to a communication technique in which a signal is transmitted / received through one node selected according to a specific rule among a plurality of nodes.
  • DPS since a node having a good channel condition between the UE and the node will be selected as a communication node, the reliability of signal transmission can be improved.
  • a cell refers to a certain geographic area in which one or more nodes provide a communication service. Therefore, in the present invention, communication with a specific cell may mean communication with an eNB or a node that provides a communication service to the specific cell.
  • the downlink / uplink signal of a specific cell means a downlink / uplink signal from / to an eNB or a node that provides a communication service to the specific cell.
  • the cell providing uplink / downlink communication service to the UE is particularly called a serving cell.
  • the channel state / quality of a specific cell means a channel state / quality of a channel or communication link formed between an eNB or a node providing a communication service to the specific cell and a UE.
  • a UE transmits a downlink channel state from a specific node on a channel CSI-RS (Channel State Information Reference Signal) resource to which the antenna port (s) of the specific node is assigned to the specific node. Can be measured using CSI-RS (s).
  • CSI-RS Channel State Information Reference Signal
  • adjacent nodes transmit corresponding CSI-RS resources on CSI-RS resources orthogonal to each other.
  • Orthogonality of CSI-RS resources means that the CSI-RS is allocated by CSI-RS resource configuration, subframe offset, and transmission period that specify symbols and subcarriers carrying the CSI-RS. This means that at least one of a subframe configuration and a CSI-RS sequence for specifying the specified subframes are different from each other.
  • Physical Downlink Control CHannel / Physical Control Format Indicator CHannel (PCFICH) / PHICH (Physical Hybrid automatic retransmit request Indicator CHannel) / PDSCH (Physical Downlink Shared CHannel) are respectively DCI (Downlink Control Information) / CFI ( Means a set of time-frequency resources or a set of resource elements that carry downlink format ACK / ACK / NACK (ACKnowlegement / Negative ACK) / downlink data, and also a Physical Uplink Control CHannel (PUCCH) / Physical (PUSCH) Uplink Shared CHannel / PACH (Physical Random Access CHannel) means a set of time-frequency resources or a set of resource elements that carry uplink control information (UCI) / uplink data / random access signals, respectively.
  • DCI Downlink Control Information
  • CFI Means a set of time-frequency resources or a set of resource elements that carry downlink format ACK / ACK
  • the PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH resource is referred to below ..
  • the user equipment transmits the PUCCH / PUSCH / PRACH, respectively.
  • PDCCH / PCFICH / PHICH / PDSCH is used for downlink data / control information on or through PDCCH / PCFICH / PHICH / PDSCH, respectively. It is used in the same sense as sending it.
  • Figure 1 illustrates an example of a radio frame structure used in a wireless communication system.
  • Figure 1 (a) shows a frame structure for frequency division duplex (FDD) used in the 3GPP LTE / LTE-A system
  • Figure 1 (b) is used in the 3GPP LTE / LTE-A system
  • the frame structure for time division duplex (TDD) is shown.
  • a radio frame used in a 3GPP LTE / LTE-A system has a length of 10 ms (307200 Ts), and is composed of 10 equally sized subframes (SF). Numbers may be assigned to 10 subframes in one radio frame.
  • Each subframe has a length of 1 ms and consists of two slots. 20 slots in one radio frame may be sequentially numbered from 0 to 19. Each slot is 0.5ms long.
  • the time for transmitting one subframe is defined as a transmission time interval (TTI).
  • the time resource may be classified by a radio frame number (also called a radio frame index), a subframe number (also called a subframe number), a slot number (or slot index), and the like.
  • the radio frame may be configured differently according to the duplex mode. For example, in the FDD mode, since downlink transmission and uplink transmission are divided by frequency, a radio frame includes only one of a downlink subframe or an uplink subframe for a specific frequency band. In the TDD mode, since downlink transmission and uplink transmission are separated by time, a radio frame includes both a downlink subframe and an uplink subframe for a specific frequency band.
  • Table 1 illustrates a DL-UL configuration of subframes in a radio frame in the TDD mode.
  • D represents a downlink subframe
  • U represents an uplink subframe
  • S represents a special subframe.
  • the singular subframe includes three fields of Downlink Pilot TimeSlot (DwPTS), Guard Period (GP), and Uplink Pilot TimeSlot (UpPTS).
  • DwPTS is a time interval reserved for downlink transmission
  • UpPTS is a time interval reserved for uplink transmission.
  • Table 2 illustrates the configuration of a singular frame.
  • FIG. 2 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.
  • FIG. 2 shows a structure of a resource grid of a 3GPP LTE / LTE-A system. There is one resource grid per antenna port.
  • a slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • OFDM symbol may mean a symbol period.
  • the signal transmitted in each slot is * Subcarriers and It may be represented by a resource grid composed of OFDM symbols.
  • Represents the number of resource blocks (RBs) in the downlink slot Represents the number of RBs in the UL slot.
  • Wow Depends on the DL transmission bandwidth and the UL transmission bandwidth, respectively.
  • Denotes the number of OFDM symbols in the downlink slot Denotes the number of OFDM symbols in the UL slot.
  • the OFDM symbol may be called an OFDM symbol, a Single Carrier Frequency Division Multiplexing (SC-FDM) symbol, or the like according to a multiple access scheme.
  • the number of OFDM symbols included in one slot may vary depending on the channel bandwidth and the length of the cyclic prefix (CP). For example, in case of a normal CP, one slot includes 7 OFDM symbols, whereas in case of an extended CP, one slot includes 6 OFDM symbols.
  • FIG. 2 illustrates a subframe in which one slot includes 7 OFDM symbols for convenience of description, embodiments of the present invention can be applied to subframes having other numbers of OFDM symbols in the same manner. 2, each OFDM symbol, in the frequency domain, * Subcarriers are included.
  • the types of subcarriers may be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of reference signals, null subcarriers for guard band, and direct current (DC) components.
  • the null subcarrier for the DC component is a subcarrier that is left unused and is mapped to a carrier frequency (f0) during an OFDM signal generation process or a frequency upconversion process.
  • the carrier frequency is also called the center frequency.
  • 1 RB in the time domain It is defined as (eg, seven) consecutive OFDM symbols, and is defined by c (for example 12) consecutive subcarriers in the frequency domain.
  • a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB is * It consists of three resource elements.
  • Each resource element in the resource grid may be uniquely defined by an index pair (k, 1) in one slot. k is from 0 in the frequency domain * Index given up to -1, where l is from 0 in the time domain Index given up to -1.
  • Two RBs one in each of two slots of the subframe, occupying the same consecutive subcarriers, are called a physical resource block (PRB) pair.
  • PRB physical resource block
  • Two RBs constituting a PRB pair have the same PRB number (or also referred to as a PRB index).
  • VRB is a kind of logical resource allocation unit introduced for resource allocation.
  • VRB has the same size as PRB.
  • FIG 3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.
  • a DL subframe is divided into a control region and a data region in the time domain.
  • up to three (or four) OFDM symbols located in the first slot of a subframe correspond to a control region to which a control channel is allocated.
  • a resource region available for PDCCH transmission in a DL subframe is called a PDCCH region.
  • the remaining OFDM symbols other than the OFDM symbol (s) used as the control region correspond to a data region to which a Physical Downlink Shared CHannel (PDSCH) is allocated.
  • PDSCH Physical Downlink Shared CHannel
  • a resource region available for PDSCH transmission in a DL subframe is called a PDSCH region.
  • Examples of DL 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), and the like.
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used for transmission of a control channel within the subframe.
  • the PHICH carries a Hybrid Automatic Repeat Request (HARQ) ACK / NACK (acknowledgment / negative-acknowledgment) signal in response to the UL transmission.
  • HARQ Hybrid Automatic Repeat Request
  • DCI downlink control information
  • DL-SCH downlink shared channel
  • UL-SCH uplink shared channel
  • paging channel a downlink shared channel
  • the transmission format and resource allocation information of a downlink shared channel may also be called DL scheduling information or a DL grant, and may be referred to as an uplink shared channel (UL-SCH).
  • the transmission format and resource allocation information is also called UL scheduling information or UL grant.
  • the DCI carried by one PDCCH has a different size and use depending on the DCI format, and its size may vary depending on a coding rate.
  • various formats such as formats 0 and 4 for uplink and formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 3, and 3A are defined for uplink.
  • Hopping flag RB allocation, modulation coding scheme (MCS), redundancy version (RV), new data indicator (NDI), transmit power control (TPC), and cyclic shift DMRS Control information such as shift demodulation reference signal (UL), UL index, CQI request, DL assignment index, HARQ process number, transmitted precoding matrix indicator (TPMI), and precoding matrix indicator (PMI) information
  • MCS modulation coding scheme
  • RV redundancy version
  • NDI new data indicator
  • TPC transmit power control
  • cyclic shift DMRS Control information such as shift demodulation reference signal (UL), UL index, CQI request, DL assignment index, HARQ process number, transmitted precoding matrix indicator (TPMI), and precoding matrix indicator (PMI) information
  • UL shift demodulation reference signal
  • CQI request UL assignment index
  • HARQ process number transmitted precoding matrix indicator
  • PMI precoding matrix indicator
  • the DCI format that can be transmitted to the UE depends on the transmission mode (TM) configured in the UE.
  • TM transmission mode
  • not all DCI formats may be used for a UE configured in a specific transmission mode, but only certain DCI format (s) corresponding to the specific transmission mode may be used.
  • the PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs).
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions.
  • the CCE corresponds to a plurality of resource element groups (REGs). For example, one CCE corresponds to nine REGs and one REG corresponds to four REs.
  • REGs resource element groups
  • a CCE set in which a PDCCH can be located is defined for each UE.
  • the set of CCEs in which a UE can discover its PDCCH is referred to as a PDCCH search space, simply a search space (SS).
  • SS search space
  • An individual resource to which a PDCCH can be transmitted in a search space is called a PDCCH candidate.
  • the collection of PDCCH candidates that the UE will monitor is defined as a search space.
  • a search space for each DCI format may have a different size, and a dedicated search space and a common search space are defined.
  • the dedicated search space is a UE-specific search space and is configured for each individual UE.
  • the common search space is configured for a plurality of UEs.
  • An aggregation level defining the search space is as follows.
  • One PDCCH candidate corresponds to 1, 2, 4 or 8 CCEs depending on the CCE aggregation level.
  • the eNB sends the actual PDCCH (DCI) on any PDCCH candidate in the search space, and the UE monitors the search space to find the PDCCH (DCI).
  • monitoring means attempting decoding of each PDCCH in a corresponding search space according to all monitored DCI formats.
  • the UE may detect its own PDCCH by monitoring the plurality of PDCCHs. Basically, since the UE does not know where its PDCCH is transmitted, every Pframe attempts to decode the PDCCH until every PDCCH of the corresponding DCI format has detected a PDCCH having its own identifier. It is called blind detection (blind decoding).
  • the eNB may transmit data for the UE or the UE group through the data area.
  • Data transmitted through the data area is also called user data.
  • a physical downlink shared channel (PDSCH) may be allocated to the data area.
  • Paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted through PDSCH.
  • the UE may read data transmitted through the PDSCH by decoding control information transmitted through the PDCCH.
  • Information indicating to which UE or UE group data of the PDSCH is transmitted, how the UE or UE group should receive and decode PDSCH data, and the like are included in the PDCCH and transmitted.
  • a specific PDCCH is masked with a cyclic redundancy check (CRC) with a Radio Network Temporary Identity (RNTI) of "A", a radio resource (eg, a frequency location) of "B” and a transmission of "C".
  • CRC cyclic redundancy check
  • RNTI Radio Network Temporary Identity
  • format information eg, transport block size, modulation scheme, coding information, etc.
  • a reference signal (RS) to be compared with the data signal is required.
  • the reference signal refers to a signal of a predetermined special waveform that the eNB and the UE know each other, which the eNB transmits to the UE or the eNB, and is also called a pilot.
  • Reference signals are divided into a cell-specific RS shared by all UEs in a cell and a demodulation RS (DM RS) dedicated to a specific UE.
  • DM RS demodulation RS
  • the DM RS transmitted by the eNB for demodulation of downlink data for a specific UE may be specifically referred to as a UE-specific RS.
  • the DM RS and the CRS may be transmitted together, but only one of the two may be transmitted.
  • the DM RS transmitted by applying the same precoder as the data may be used only for demodulation purposes, and thus RS for channel measurement should be separately provided.
  • an additional measurement RS, CSI-RS is transmitted to the UE.
  • the CSI-RS is transmitted every predetermined transmission period consisting of a plurality of subframes, unlike the CRS transmitted every subframe, based on the fact that the channel state is relatively not changed over time.
  • FIG. 4 illustrates an example of an uplink (UL) subframe structure used in a 3GPP LTE / LTE-A system.
  • the UL subframe may be divided into a control region and a data region in the frequency domain.
  • One or several physical uplink control channels may be allocated to the control region to carry uplink control information (UCI).
  • One or several physical uplink shared channels may be allocated to a data region of a UL subframe to carry user data.
  • subcarriers having a long distance based on a direct current (DC) subcarrier are used as a control region.
  • subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of uplink control information.
  • the DC subcarrier is a component that is not used for signal transmission and is mapped to a carrier frequency f0 during frequency upconversion.
  • the PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency in one subframe, and the RBs belonging to the RB pair occupy different subcarriers in two slots.
  • the PUCCH allocated in this way is expressed as that the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, if frequency hopping is not applied, RB pairs occupy the same subcarrier.
  • PUCCH may be used to transmit the following control information.
  • SR Service Request: Information used for requesting an uplink UL-SCH resource. It is transmitted using OOK (On-Off Keying) method.
  • HARQ-ACK A response to a PDCCH and / or a response to a downlink data packet (eg, codeword) on a PDSCH. This indicates whether the PDCCH or PDSCH is successfully received.
  • One bit of HARQ-ACK is transmitted in response to a single downlink codeword, and two bits of HARQ-ACK are transmitted in response to two downlink codewords.
  • HARQ-ACK response includes a positive ACK (simple, ACK), negative ACK (hereinafter, NACK), DTX (Discontinuous Transmission) or NACK / DTX.
  • the term HARQ-ACK is mixed with HARQ ACK / NACK, ACK / NACK.
  • CSI Channel State Information
  • MIMO Multiple Input Multiple Output
  • RI rank indicator
  • PMI precoding matrix indicator
  • the amount of uplink control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for control information transmission.
  • SC-FDMA available for UCI means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of a subframe including a Sounding Reference Signal (SRS), the last SC of the subframe
  • SRS Sounding Reference Signal
  • the -FDMA symbol is also excluded.
  • the reference signal is used for coherent detection of the PUCCH.
  • PUCCH supports various formats according to the transmitted information.
  • Table 4 shows a mapping relationship between PUCCH format and UCI in LTE / LTE-A system.
  • the PUCCH format 1 series is mainly used to transmit ACK / NACK information
  • the PUCCH format 2 series is mainly used to carry channel state information (CSI) such as CQI / PMI / RI
  • the PUCCH format 3 series is mainly used to transmit ACK / NACK information.
  • a terminal receives information about a Positioning Reference Signal (PRS) transmission of base stations from a higher layer signal, measures a PRS transmitted by cells around the terminal, and receives a reception time and a neighbor of a PRS signal transmitted from a reference base station.
  • PRS Positioning Reference Signal
  • OBDOA Observed Time
  • RSTD reference signal time difference
  • the network calculates the location of the terminal using the RSTD and other information.
  • Positioning techniques such as Difference Of Arrival).
  • A-GNSS Assisted Global Navigation Satellite System
  • E-CID Enhanced Cell-ID
  • UTDOA Uplink Time Difference of Arrival
  • an LTE positioning protocol (LPP) is defined to support the OTDOA scheme, and the LPP informs the UE of OTDOA-ProvideAssistanceData having the following configuration as an information element (IE).
  • IE information element
  • OTDOA-ProvideAssistanceData :: SEQUENCE ⁇
  • OTDOA-ReferenceCellInfo means a cell which is a reference of RSTD measurement, and is configured as follows.
  • OTDOA-ReferenceCellInfo :: SEQUENCE ⁇
  • OTDOA-NeighbourCellInfoList :: SEQUENCE (SIZE (1..maxFreqLayers)) OF OTDOA-NeighbourFreqInfo
  • OTDOA-NeighborFreqInfo :: SEQUENCE (SIZE (1..24)) OF OTDOA-NeighbourCellInfoElement
  • OTDOA-NeighbourCellInfoElement :: SEQUENCE ⁇
  • PRS-Info which is an IE included in OTDOA-ReferenceCellInfo and OTDOA-NeighborCellInfo, contains PRS information.
  • PRS-Info :: SEQUENCE ⁇
  • prs-Bandwidth ENUMERATED ⁇ n6, n15, n25, n50, n75, n100, ... ⁇ ,
  • 5 shows a PRS transmission structure according to the parameters.
  • the PRS Periodicity and the PRS Subframe Offset are determined according to the value of the PRS Configuration Index (IPRS), and the corresponding relations are as follows.
  • PRS Configuration Index I PRS
  • PRS Periodicity subframes
  • PRS Subframe Offset subframes 0-159 160 I PRS 160-479 320
  • I PRS -160 480-1119 640
  • I PRS -480 1120-23399 1280 I PRS -1120
  • Positioning reference signal PRS
  • the PRS has a transmission opportunity, that is, a positioning occasion, at a period of 160, 320, 640, or 1280 ms, and may be transmitted during N DL subframes consecutive to the positioning opportunity. Wherein N may have a value of 1, 2, 4, or 6. Although the PRS may be transmitted substantially in the positioning opportunity, it may be muted for intercell interference control cooperation. Information about this PRS muting is signaled to the UE by prs-MutingInfo. Unlike the system band of the serving base station, the transmission bandwidth of the PRS may be set independently and is transmitted in a frequency band of 6, 15, 25, 50, 75, or 100 resource blocks (RBs).
  • RBs resource blocks
  • the transmission sequence of the PRS is generated by initializing a pseudo-random sequence generator for each OFDM symbol as 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) as shown in FIG. 6 (general CP) and FIG.
  • the location of the RE to be mapped can shift on the frequency axis, the shift value being determined by the cell ID.
  • the position of the PRS transmission RE shown in FIGS. 6 and 7 is a case where the frequency shift is zero.
  • the UE receives configuration information on the list of PRSs to be searched from the location management server of the network for PRS measurement.
  • the information includes PRS configuration information of a reference cell and PRS configuration information of neighbor cells.
  • the configuration information of each PRS includes the occurrence period and offset of the positioning opportunity, the number of consecutive DL subframes constituting one positioning opportunity, the cell ID used to generate the PRS sequence, the CP type, and the CRS antenna considered in the PRS mapping. The number of ports, and the like.
  • the PRS configuration information of neighbor cells includes slot offsets and subframe offsets of neighbor cells and reference cells, and the degree of inaccuracy of the expected RSTD and the expected RSTD. It is intended to assist in determining at what point in time to detect and with what time window the PRS should be searched.
  • the RSTD refers to a relative timing difference between the neighboring or neighboring cell j and the reference cell i. That is, the RSTD may be represented by T subframeRxj -T subframeRxi , where T subframeRxj is a time point at which the UE receives the start of a specific subframe from the neighbor cell j, and T subframeRxi is a UE received from the neighbor cell j It is the time point at which the start of the subframe corresponding to the specific subframe from the reference cell i, which is closest in time to the specific subframe, is received.
  • the reference point for the observed subframe time difference is the antenna connector of the UE.
  • the conventional positioning schemes are already supported by the 3GPP UTRA and E-UTRA standards (eg, LTE Rel-9), but in recent years, higher accuracy is required, especially for in-building positioning schemes. . That is, although the conventional positioning schemes can be commonly applied to outdoor and indoor environments, the conventional positioning accuracy is, for example, in the NLOS (non-LOS) environment for the E-CID scheme. It is known as 150m and 50m in LOS environment.
  • the OTDOA method based on PRS also includes an eNB synchronization error, an error caused by multipath propagation, an RSTD measurement quantization error of a UE, a timing offset estimation error, and the like. Positional error can exceed 100m.
  • the A-GNSS method has a limitation in complexity and battery consumption since a GNSS receiver is required, and there is a limitation in using it for positioning in a building.
  • the proposed scheme will be described based on the 3GPP LTE system.
  • the scope of the system to which the proposed scheme is applied can be extended to other systems (eg, UTRA, etc.) in addition to the 3GPP LTE system.
  • the cellular network basically transmits a specific pilot signal (for example, a specific reference signal that can be separately identified for each base station / transmission point) to the terminal, and the terminal measures each pilot signal to determine specific positioning.
  • a specific pilot signal for example, a specific reference signal that can be separately identified for each base station / transmission point
  • the terminal measures each pilot signal to determine specific positioning.
  • the name of the base station described herein is used in a generic term including a remote radio head (RRH), an eNB, a transmission point (TP), a reception point (RP), a relay, and the like.
  • RRH remote radio head
  • TP transmission point
  • RP reception point
  • relay and the like.
  • OTDOA positioning refers to a method in which a network that receives an RSTD measurement from a PRS transmitted by each base station estimates a location of a UE.
  • RSTD refers to a difference between a reception timing (eg, time of arrival (TOA)) value measured from a subframe of a predetermined reference cell and an adjacent cell, and the UE may specify a specific value in the mapping table for reporting. The value is converted and reported to the network.
  • TOA time of arrival
  • OTD measurement result is used to report the RSTD measurement result of the UE to the E-SMLC.
  • the following fields are used in the information element.
  • This field indicates the starting subframe of the PRS positioning opportunity if the PRS is available on the RSTD reference cell, or the RSTD measurement if the PRS on the RSTD reference cell is not available while the most recent neighbor cell RSTD measurement is performed.
  • the SFN of the RSTD reference cell including the subframe of the CRS is specified. (This field specifies the SFN of the RSTD reference cell containing the starting subframe of the PRS positioning occasion if PRS are available on the RSTD reference cell, or subframe of the CRS for RSTD measurements if PRS are not available on the RSTD reference cell during which the most recent neighbor cell RSTD measurement was performed.)
  • the UE According to the description of the field, it is possible for the UE to perform RSTD measurement using CRS when PRS is not available. In addition, it is also possible to perform RSTD measurement by using the PRS and the CRS together by the implementation of the UE.
  • the UE when the same physical cell ID is assigned to a plurality of remote radio heads (TP / RRH) in a specific cell as in CoMP scenario 4, the UE is assigned to one physical cell ID corresponding to the plurality of TP / RRHs. Since the CRS is generated and mapped to the same RE, the CRS transmitted from which TP / RRH cannot be distinguished. Therefore, in this situation, when performing the RSTD measurement using the CRS may adversely affect the accuracy of the RSTD measurement. Similar effects are expected in the recent PRS-only beacon. In the case of PRS-only beacon, it means a low-power device designed to transmit only some physical signals including PRS.
  • CRS is transmitted for PRS-only beacon which does not actually transmit CRS. This may adversely affect the accuracy of the measurement. Therefore, it may be important to indicate whether to use the CRS when performing the RSTD measurement to the UE.
  • assistance data for RSTD measurement may be provided from a location server (eg, E-SMLC) to the UE.
  • a location server eg, E-SMLC
  • information on the reference cell and the neighbor cell for RSTD measurement are displayed in "OTDOA-ReferenceCellInfo" and "OTDOA-NeighbourCellInfoElement", respectively, and the UE uses this information to determine the PRS. Timing measurements are taken to report the final RSTD measurement.
  • a seed used to generate a CRS sequence as a method for eliminating ambiguity for CRS distinction when the same physical cell ID is assigned to a plurality of remote radio heads (TP / RRH) in a specific cell.
  • seed You can use a value other than "physical cell ID”.
  • the "PhysCellId" field in "OTDOA-ReferenceCellInfo” or “OTDOA-NeighbourCellInfoElement” may be indicated with a value other than 0 to 503.
  • the UE should not use CRS or only PRS when the cell performs the associated RSTD measurement. Can be set to use.
  • the UE should not use the CRS and / or PRS when the cell performs the associated RSTD measurement. Only can be set to use.
  • the UE may be pre-defined / set to not use the CRS and / or to use only the PRS when the cell performs the associated RSTD measurement. have.
  • the UE may not use the CRS when the cell performs the associated RSTD measurement and / or Or it may be defined / set in advance to use only PRS.
  • a predefined / committed specific value e.g., greater than 503
  • rules may be set to use previously promised / defined values as the "PhysCellId” field value in "OTDOA-ReferenceCellInfo” or "OTDOA-NeighbourCellInfoElement”. have.
  • a rule may be defined to omit the "PhysCellId" field in "OTDOA-ReferenceCellInfo” or "OTDOA-NeighbourCellInfoElement" for TPs (eg, PRS-only beacons) that do not actually transmit CRS.
  • the UE may assume that the TP corresponding to the IE does not transmit the CRS and may not be configured to use the CRS when performing the RSTD measurement.
  • the UE rules that the cell should not use the CRS and / or use only the PRS when the cell performs the associated RSTD measurement. Can be defined.
  • the rule is that the UE should not use the CRS for that cell and / or use only the PRS when the cell performs the associated RSTD measurement. Can be defined.
  • the specific field may be a virtual cell ID or a field indicating the same.
  • the UE should not use the CRS for that cell and / or only the PRS when the cell performs the associated RSTD measurement. Can be set to use.
  • the UE uses only (1) some CRS ports for the cell when the cell performs the associated RSTD measurement. Or (2) use only the CRS RE of a particular OFDM symbol in a subframe.
  • the UE should not use the CRS for that cell and / or use only the PRS when the cell performs the associated RSTD measurement. It can be set to. Or, depending on whether there is a specific multiple fields in the "OTDOA-NeighbourCellInfoElement" set for the UE, the UE may use only (1) some CRS ports for the cell when the cell performs the associated RSTD measurement or (2 ) Can be set to use only the CRS RE of a specific OFDM symbol in a subframe.
  • the following RSTD measurement behavior of the UE may be defined as follows.
  • a rule may be defined such that the UE uses the PRS and the CRS for the cell when the cell performs an associated RSTD measurement.
  • the UE may only use PRS for that cell and / or do not use CRS when the cell performs an associated RSTD measurement.
  • Rules can be defined. Or, if the virtual cell ID field is present and the CRS CP length field is not present, the UE will only have certain CRS ports (e.g., CRS port 0 and / or 1) specific for that cell when the cell performs the associated RSTD measurement. The rule may be defined to use or to use only the CRS RE of some specific OFDM symbol.
  • the UE may use only the CRS for the cell and / or do not use the PRS when the cell performs the associated RSTD measurement. Rules can be defined.
  • a rule when there is no virtual cell ID field and there is no CRS CP length field, a rule may be defined such that the UE does not perform associated RSTD measurement. Or, if the virtual cell ID field does not exist and the CRS CP length field does not exist, the UE may select some specific CRS port (eg, CRS port 0 and / or 1) for that cell when the cell performs the associated RSTD measurement.
  • the rule may be defined to use only or to use only the CRS RE of some specific OFDM symbols.
  • the implementation of the RSTD measurement may be possible by using only the PRS or a combination of the PRS and the CRS by the implementation of the UE. If the RSTD measurement of the UE is performed without separate signaling from the location server, as mentioned above, it may not be desirable to use CRS in certain situations.
  • the UE When the UE reports a specific RSTD measurement, it may report including signaling indicating whether the CRS is used. Alternatively, it may be reported including signaling indicating whether only PRS is used, only CRS is used, and / or whether PRS and CRS are used together.
  • the signaling may be defined and indicated as a specific field in the "NeighborMeasurementElement".
  • the location server may determine whether to use the RSTD measurement corresponding to a specific neighbor cell for the location estimation of the UE through the signaling. For example, if the CRS is reported to be used for the RSTD measurement corresponding to the TP not transmitting the CRS, the location server may discard the measurement value.
  • Information on whether the UE can perform RSTD measurements using only PRS and / or can perform RSTD measurements using only CRS and / or whether it is possible to perform RSTD measurements using both PRS and CRS together It may report to the location server including signaling indicating the.
  • the signaling may be defined and indicated as a specific field in the "OTDOA-ProvideCapabilities".
  • a quasi-co-location (QCL) assumption for the corresponding PRS and a specific RS may be indicated.
  • QCL means that it has the same reception characteristics (eg, delay spread, Doppler spread, Doppler shift, average delay, etc.) in the long term with a specific RS. It is safe to assume.
  • Information that a PRS and a specific RS have been QCLed may be indicated by explicit signaling or may implicitly inform the UE to consider it.
  • the UE may assume that the PRS and the CRS are QCL for the reference cell, and a rule may be defined to use the PRS and the CRS together in the RSTD measurement.
  • the UE when receiving "CRS CP length information for a specific cell" in "OTDOA-NeighbourCellInfoElement" set to the UE, that is, a field for "CRS CP length information for a specific cell” in "OTDOA-NeighbourCellInfo". If is present, the UE may assume that the PRS and the CRS are QCL for the corresponding cell, and a rule may be defined to use the PRS and the CRS together in the RSTD measurement.
  • FIG. 8 illustrates an operation for measuring a reference signal for position determination in a wireless communication system. The operation is performed by the terminal 81.
  • the terminal may receive auxiliary data for position determination (S810).
  • the auxiliary data may include configuration information related to a positioning reference signal (PRS) for reference cells and neighbor cells.
  • PRS positioning reference signal
  • the UE may calculate a reference signal time difference (RST) measurement value by receiving the PRS or CRS (cell-specific reference signal) of the reference cell and the PRS or CRS of the neighbor cells using the auxiliary data ( S820).
  • RST reference signal time difference
  • the terminal may report the measured value to the location server (S830).
  • the terminal may report whether the PRS or the CRS is used for the measurement to the location server.
  • the terminal may report capability information on whether the terminal can use PRS or CRS for the measurement to the location server.
  • the CRS of the reference cell or the neighbor cells may be excluded from the measurement.
  • PRS-related configuration information of neighbor cells that do not transmit CRS among the neighbor cells may include a specific field indicating the previously promised value.
  • the CRS of some CRS ports of the reference cell or the neighbor cells or a specific orthogonal frequency division multiplexing (OFDM) symbol in a corresponding subframe Only a resource element (RE) can be used for the measurement.
  • OFDM orthogonal frequency division multiplexing
  • auxiliary data may indicate that the PRS of the reference cell can be used for RSTD measurement.
  • the specific field may be a physical layer cell identifier field.
  • the embodiment related to FIG. 8 may alternatively or additionally include at least some of the above-described embodiment (s).
  • FIG. 9 is a block diagram showing the components of the transmitter 10 and the receiver 20 for carrying out the embodiments of the present invention.
  • the transmitter 10 and the receiver 20 are associated with transmitters / receivers 13 and 23 capable of transmitting or receiving radio signals carrying information and / or data, signals, messages, etc.
  • Memory 12, 22 for storing a variety of information, the transmitter / receiver 13, 23 and the memory 12, 22 and the like is operatively connected to control the components to control the components described above
  • the memories 12 and 22 may store a program for processing and controlling the processors 11 and 21, and may temporarily store input / output information.
  • the memories 12 and 22 may be utilized as buffers.
  • the processors 11 and 21 typically control the overall operation of the various modules in the transmitter or receiver. In particular, the processors 11 and 21 may perform various control functions for carrying out the present invention.
  • the processors 11 and 21 may also be called controllers, microcontrollers, microprocessors, microcomputers, or the like.
  • the processors 11 and 21 may be implemented by hardware or firmware, software, or a combination thereof.
  • firmware or software When implementing the present invention using hardware, application specific integrated circuits (ASICs) or digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays) may be provided in the processors 11 and 21.
  • 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 a module, a procedure, or a function for performing the functions or operations of the present invention, and configured to perform the present invention.
  • the firmware or software may be provided in the processors 11 and 21 or stored in the memory 12 and 22 to be driven by the processors 11 and 21.
  • the processor 11 of the transmission apparatus 10 is predetermined from the processor 11 or a scheduler connected to the processor 11 and has a predetermined encoding and modulation on a signal and / or data to be transmitted to the outside. After performing the transmission to the transmitter / receiver (13). For example, the processor 11 converts the data sequence to be transmitted into K layers through demultiplexing, channel encoding, scrambling, and modulation.
  • the coded data string is also called a codeword and is equivalent to a transport block, which is a data block provided by the MAC layer.
  • One transport block (TB) is encoded into one codeword, and each codeword is transmitted to a receiving device in the form of one or more layers.
  • the transmitter / receiver 13 may include an oscillator for frequency upconversion.
  • the transmitter / receiver 13 may include Nt transmit antennas, where Nt is a positive integer greater than or equal to one.
  • the signal processing of the receiver 20 is the reverse of the signal processing of the transmitter 10.
  • the transmitter / receiver 23 of the receiver 20 receives a radio signal transmitted by the transmitter 10.
  • the transmitter / receiver 23 may include Nr receive antennas, and the transmitter / receiver 23 frequency down-converts each of the signals received through the receive antennas to restore baseband signals. do.
  • Transmitter / receiver 23 may include an oscillator for frequency downconversion.
  • the processor 21 may decode and demodulate a radio signal received through a reception antenna to restore data originally transmitted by the transmission apparatus 10.
  • the transmitter / receiver 13, 23 is equipped with one or more antennas.
  • the antenna transmits a signal processed by the transmitter / receiver 13, 23 to the outside or receives a radio signal from the outside under the control of the processors 11 and 21, thereby transmitting / receiving the transmitter / receiver. It performs the function of forwarding to (13, 23).
  • Antennas are also called antenna ports.
  • Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna elements.
  • the signal transmitted from each antenna can no longer be decomposed by the receiver 20.
  • a reference signal (RS) transmitted in correspondence with the corresponding antenna defines the antenna as viewed from the perspective of the receiver 20, and whether the channel is a single radio channel from one physical antenna or includes the antenna.
  • RS reference signal
  • the receiver 20 enables channel estimation for the antenna. That is, the antenna is defined such that a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is delivered.
  • MIMO multi-input multi-output
  • the terminal or the UE operates as the transmitter 10 in the uplink and the receiver 20 in the downlink.
  • the base station or eNB operates as the receiving device 20 in the uplink, and operates as the transmitting device 10 in the downlink.
  • the transmitter and / or the receiver may perform at least one or a combination of two or more of the embodiments of the present invention described above.
  • the present invention can be used in a wireless communication device such as a terminal, a relay, a base station, and the like.

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Abstract

L'invention concerne un procédé de mesure d'un signal référence pour détermination de position dans un système de communications sans fil, qui, selon un mode de réalisation de la présente invention, est réalisé au moyen d'un terminal. Le procédé comporte les étapes consistant à: recevoir des données auxiliaires qui comportent des informations de configuration liées à un signal de référence de positionnement (liées à un PRS) pour une cellule de référence et des cellules voisines, en vue d'une détermination de position; au moyen de l'utilisation des données auxiliaires, recevoir un PRS ou un signal de référence spécifique à la cellule (CRS) de la cellule de référence et un PRS ou un CRS des cellules voisines et calculer une valeur de mesure d'écart temporel de signal de référence (RSTD); et rendre compte de la valeur de mesure à un serveur de localisation, caractérisé en ce que, si un champ particulier des informations de configuration liées au PRS pour la cellule de référence ou les cellules voisines indiquent une valeur préalablement convenue, un CRS de la cellule de référence ou des cellules voisines peut être exclu de la mesure.
PCT/KR2016/007569 2015-08-09 2016-07-12 Procédé de réception ou d'émission d'un signal de référence pour détermination de position dans un système de communications sans fil et dispositif à cet effet WO2017026672A1 (fr)

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WO2022025371A1 (fr) * 2020-07-28 2022-02-03 Samsung Electronics Co., Ltd. Procédé et appareil de positionnement d'un équipement utilisateur
WO2022206688A1 (fr) * 2021-04-02 2022-10-06 华为技术有限公司 Procédé et appareil de positionnement
WO2022227796A1 (fr) * 2021-04-27 2022-11-03 大唐移动通信设备有限公司 Procédé et appareil de positionnement d'un dispositif terminal, et support de stockage
WO2023173406A1 (fr) * 2022-03-18 2023-09-21 Zte Corporation Procédé de positionnement basé sur une phase de porteuse
WO2023207467A1 (fr) * 2022-04-27 2023-11-02 华为技术有限公司 Procédé et appareil de communication

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