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WO2014029242A1 - 终端定位方法、基站及用户设备 - Google Patents

终端定位方法、基站及用户设备 Download PDF

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Publication number
WO2014029242A1
WO2014029242A1 PCT/CN2013/079312 CN2013079312W WO2014029242A1 WO 2014029242 A1 WO2014029242 A1 WO 2014029242A1 CN 2013079312 W CN2013079312 W CN 2013079312W WO 2014029242 A1 WO2014029242 A1 WO 2014029242A1
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WO
WIPO (PCT)
Prior art keywords
signal
crs
prs
port
reference signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/079312
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English (en)
French (fr)
Inventor
刘劲楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP13831236.8A priority Critical patent/EP2876951A4/en
Publication of WO2014029242A1 publication Critical patent/WO2014029242A1/zh
Priority to US14/624,162 priority patent/US9766323B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/10Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S1/00Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/08Systems for determining direction or position line
    • G01S1/20Systems for determining direction or position line using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/0205Details
    • G01S5/0221Receivers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/0205Details
    • G01S5/0236Assistance data, e.g. base station almanac
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/06Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Definitions

  • Terminal positioning method, base station and user equipment This application claims priority to Chinese patent application filed on August 20, 2008, the Chinese Patent Office, application number 201210296773.X, the invention titled "terminal positioning method, base station and user equipment” The entire contents of which are incorporated herein by reference.
  • the present invention relates to the field of communications, and in particular, to a terminal positioning method, a base station, and a user equipment. Background technique
  • the OTDOA positioning system includes three devices: a base station, a terminal, and a network side positioning server.
  • the OTDOA positioning technology is a terminal-assisted positioning method, that is, the terminal performs reference signal time difference (RSTD) measurement, and the network side positioning server performs UE position estimation according to the RSTD measurement result.
  • RSTD reference signal time difference
  • a plurality of base stations transmit a Position Reference Signal Subframe for terminal positioning. This time period is called a PRS measurement opportunity ( occasion ), and a PRS measurement opportunity includes one or more Position Reference Signal Subframes.
  • the network side positioning server sends a measurement assistance message, and notifies the base station of each terminal to send a configuration of the positioning reference signal subframe.
  • the terminal receives the downlink subframe signal sent by each base station in the PRS measurement opportunity according to the auxiliary message, and measures the reference signal time difference (RSTD) of the PRS reference signal sent by each base station to the network side.
  • the network side performs hyperbolic positioning according to RSTD to obtain the estimated terminal position.
  • the UE obtains the RSTD by measuring the received PRS and the local PRS correlation, and passing the position of the correlation peak. Whether the position of the correct correlation peak can be obtained is affected by the autocorrelation property of the PRS signal, and is enhanced as the number of PRSs in the sub-frame of the positioning reference signal is increased, and the number of sub-frames of the positioning reference signal is increased.
  • the probability of detection of the RSTD measurement is limited by the number of symbols of the PRS reference signal that can be used for measurement within one subframe.
  • PRS is a new reference signal for R9.
  • the protocol stipulates that the positioning reference signal should be compatible with the design of R8.
  • the PRS cannot be transmitted in the symbol where the Cell-Specific Reference Signal (CRS) is located.
  • CRS Cell-Specific Reference Signal
  • the object of the present invention is to provide a terminal positioning method, which solves the problem that the number of PRS symbols of the positioning reference signal is small when the terminal is located in the prior art, and the detection probability of the RSTD measurement is affected.
  • the embodiment of the present invention provides a terminal positioning method, where the method includes: generating a cell-specific reference signal CRS, and transmitting the CRS signal to one or more ports for transmitting a CRS signal;
  • a positioning reference signal PRS is generated, and the PRS signal is transmitted on a port for transmitting a CRS.
  • an embodiment of the present invention provides a terminal positioning method, where the method includes: receiving a positioning reference signal subframe, where the positioning reference signal subframe is included in one for sending
  • the second correlation value, the reference signal time difference measurement is performed according to the first correlation value and the second correlation value.
  • an embodiment of the present invention provides a base station, including: a signal generating unit, generating a cell-specific reference signal CRS, and a positioning reference signal PRS; and a signal sending unit, configured to send the CRS signal to one or more ports for transmitting a CRS signal, and use the PRS signal in one Sended on the port that sends the CRS.
  • an embodiment of the present invention further provides a user equipment, including:
  • a receiving unit configured to receive a positioning reference signal subframe sent by the base station, where the positioning reference signal subframe includes a PRS signal sent on a port for transmitting the CRS, and one or more signals for transmitting the CRS signal The CRS signal sent by the port;
  • a local signal generating unit configured to generate a local PRS signal and a local CRS signal sent in a PRS bandwidth on the port;
  • An operation unit configured to correlate the received PRS signal and the local PRS signal to obtain a first correlation value, and correlate the received CRS signal and the local CRS signal to obtain a second correlation value, according to the first correlation value and the The second correlation value is used to perform a reference signal time difference measurement.
  • an embodiment of the present invention further provides a base station, including:
  • the baseband processing unit performs baseband signal processing and performs:
  • the RF front end and the antenna are used to modulate the baseband signal onto the carrier frequency and transmit it on the antenna port.
  • the CRS signal is sent in one or more ports for transmitting the CRS signal.
  • the embodiment of the present invention further provides a user equipment, including:
  • the baseband processing unit performs baseband signal processing and performs:
  • the RF front end and the antenna are used to demodulate the received signal on the receiving antenna port into a baseband signal, and perform:
  • the PRS signal transmitted on the port of the CRS, and the CRS signal transmitted at one or more ports for transmitting the CRS signal are provided.
  • the terminal positioning method provided by the embodiment of the present invention limits the port that sends the CRS and the port that sends the PRS to the same antenna port, so that the receiving terminal can correlate the received CRS and PRS sent by the base station on the corresponding antenna port.
  • the correlation value on each symbol reduces the number of reference signal symbols that can be used for positioning in one sub-frame due to the limited influence of the number of PRS transmission symbols, thereby reducing the influence of the secondary peak and enhancing the main peak energy.
  • 1 is a system architecture diagram of a terminal positioning method
  • FIG. 3 is a flowchart of another embodiment of a method for locating a terminal according to an embodiment of the present invention
  • FIG. 4 is a flowchart of another method for locating a terminal according to an embodiment of the present invention
  • FIG. 6 is a structural diagram of a method for locating a terminal according to an embodiment of the present invention
  • FIG. 7 is a structural diagram of an embodiment of a base station according to an embodiment of the present invention
  • FIG. 8 is a structural diagram of an embodiment of a user equipment according to an embodiment of the present invention.
  • FIG. 9 is a structural diagram of another embodiment of a base station according to an embodiment of the present disclosure.
  • FIG. 10 is a structural diagram of another embodiment of a user equipment according to an embodiment of the present invention. detailed description
  • the protocol specifies that the positioning reference signal is compatible with the R8 design.
  • the PRS cannot be sent in the symbol where the Cell-Specific Reference Signal (CRS) is located.
  • CRS Cell-Specific Reference Signal
  • the protocol keeps the data in the PRS bandwidth on the symbol where the non-control channel is located, that is, in addition to the primary synchronization signal (PSS), the secondary synchronization signal (Secondary Synchronization Signal) in the PRS bandwidth. , SSS), CRS, PRS Several other reference signals, no other data is sent.
  • the transmission of the current positioning reference signal PRS since the transmission of the current positioning reference signal PRS must avoid the symbols in which the control channel and the CRS signal are located, among the 14 OFMD symbols of the normal subframe or the 12 OFMD numbers of the extended subframe in one subframe,
  • 4 symbols are occupied.
  • antenna ports PORT0-PORT3 occupy 6 symbols, and the control channel occupies the first three.
  • the reference signal represented in FIG. 2 is indicated in FIG. 210: PRS, CRS, physical control format indicator channel PCFICH, physical downlink control channel PDCCH, and physical hybrid automatic repeat request indicator channel PHICH, the above three channels For the control channel.
  • the basic idea of the embodiment of the present invention is to transmit a PRS signal on a port for transmitting a CRS, so that the terminal will receive the positioning reference signal subframe for correlation and combine, and increase the number of reference signal symbols that can be used for positioning in one subframe. .
  • FIG. 3 is a flowchart of a method for locating a terminal according to an embodiment of the present invention.
  • the execution subject of the embodiment is a base station in a communication system, such as the base station 102 in FIG. Includes:
  • S301 Generate a cell-specific reference signal CRS, and send the CRS signal to one or more ports for transmitting a CRS signal.
  • generating the CRS signal refers to producing an orthogonal frequency division multiplexing OFDM symbol including a CRS signal, and then, the symbol containing the CRS signal is at one or more ports for transmitting the CRS signal. send.
  • the number of / symbols occupied by the CRS in the subframe is given by the following equation in the protocol 3GPP TS 36.211, /? Indicates the antenna port, indicating that the number of symbols is included in one slot, the normal subframe is 7, and the extended subframe is 6.
  • the first three symbols of the even slot are the control region, that is, #0, #1, #2 are control channel regions. , send control channel information.
  • the base station performs QPSK modulation on the generated scrambling code sequence according to the Physcal Cell Indentify (PCID), the slot number in the slot number, and the port number;?, corresponding to the generated scrambling code sequence, according to different antennas.
  • PCID Physical Cell Indentify
  • the port number, the QPSK symbol is mapped to the resource element (Resource Element, RE), and the resource unit is transformed into the time domain by inverse Fourier transform, and a Cyclic Prefix (CP) is added to generate an OFDM symbol.
  • RE Resource Element
  • CP Cyclic Prefix
  • the production of the PRS signal refers to generating an orthogonal frequency division multiplexed OFDM symbol including a positioning reference signal PRS, and transmitting the PRS-containing symbol on a port for transmitting a CRS.
  • the number of symbols/symbols occupied by the PRS in the subframe is given by the following equation in the protocol 3GPP TS 36.211, indicating the slot number, according to the number of PBCH (Physical Broadcast Channel) transmitting antenna ports, the subframe type is different, and the sending The symbol is 8, 7, 6 or 5 OFMD symbols.
  • PBCH Physical Broadcast Channel
  • the PBCH transmit antenna port is the same as the CRS transmit port.
  • the base station according to the physical cell identifier (Physcal Cell Indentify PCID), the slot number, the symbol number in the slot, corresponding to the scrambling code sequence for generating the PRS, After the generated scrambling code sequence is QPSK modulated, the QPSK symbol is mapped to a resource element (Resource Element, RE), and the resource unit is transformed into a time domain by inverse Fourier transform, and a cyclic prefix is added to generate an OFDM symbol.
  • PCID Physical Cell Indentify PCID
  • the resource mapping of the PRS is independent of the port number, so resource mapping can be performed without knowing the port.
  • the OFDM symbol containing the PRS is transmitted on the port of one CRS.
  • both the base station and the terminal can pre-determine which port to use for transmission, or use the dynamic configuration method to select, in the dynamic configuration
  • the measurement assistance message is also sent to the UE through the network side, and the corresponding relationship between the selected sending port and the port that sends the CRS signal is indicated to the user equipment.
  • the PRS transmission antenna port is indicated as port0.
  • both the base station and the terminal can be scheduled in advance, and the PRS port is transmitted by port portO. If the PRS transmission port is dynamically configured, it needs to be determined according to the current number of CRS transmission antennas. If the CRS is transmitted on the 1 antenna port, only the portO can be configured. If the CRS is transmitted on the 2 antenna port, you can configure the portO or portl two antenna ports. One. If the CRS is sent on 4 antenna ports, you can configure one of the four antenna ports port0, portl, port2 and port3.
  • PRS is preferably transmitted by portO.
  • the portO is used for transmission, and the PRS can also be selected to be sent by portl.
  • S301 and S302 have no timing relationship, and are described in the foregoing order for convenience of explanation.
  • the UE can use the 3 OFDM symbols of the CRS in the non-control channel and the 5-8 OFDM symbols of the PRS for the RSTD measurement, thereby improving the correlation of the reference signal.
  • FIG. 4 is a reference diagram of another embodiment of a method for locating a terminal according to an embodiment of the present invention.
  • the executor of the embodiment is a user equipment, such as the UE 116 or the UE 122 in FIG.
  • Step S401 Receive a positioning reference signal subframe.
  • one or more positioning reference signal subframes sent by multiple base stations included in the positioning reference signal measurement opportunity are received.
  • a positioning reference signal subframe includes not only a CRS but also a PRS.
  • the positioning reference signal subframe includes an OFDM symbol of a PRS signal transmitted by a port for transmitting a CRS, and an OFDM symbol of a CRS signal transmitted by one or more ports for transmitting a CRS signal;
  • the UE receives the PRS and CRS signals sent by the positioning base station in the same port in the PRS opportunity, and includes multiple subframes, each of which includes an OFDM symbol carrying a CRS and an OFDM symbol carrying a PRS.
  • Step S402 generating a local PRS signal and a local CRS signal sent in a PRS bandwidth on the port.
  • the UE before receiving the PRS and CRS sent by the base station or receiving the PRS and CRS signals, the UE also generates a local reference signal, that is, a local PRS signal and a local CRS signal.
  • the local CRS signal generation is only generated within the PRS bandwidth, and a plurality of OFDM symbols on the corresponding port of the PRS signal.
  • the OFDM symbol / in the sub-frame is determined according to the port number, the scrambling code is generated, the scrambling code is QPSK modulated, the resource mapping is performed according to the port number, and then the time domain signal is obtained by IFFT transform.
  • the local CRS signal can be with or without a CP.
  • the PRS signal is generated with only one port.
  • the local PRS signal is generated by first generating a scrambling code, performing QPSK modulation on the scrambling code, performing resource mapping according to the port number, and then obtaining a time domain signal by IFFT transform.
  • the local CRS signal can be with or without a CP.
  • CRS and PRS use the same gold sequence, and the initial value of gold is obtained in the same way, CRS and PRS can share the same 4 sigma generating unit, input the corresponding slot number and the number of symbols in the slot, and generate different The scrambling sequence on the symbol. .
  • the UE Before the step, if the base station is a dynamically configured transmission port, the UE also needs to receive the measurement assistance message sent by the base station, and the port for transmitting the PRS signal and the CRS signal selected by the base station is obtained according to the measurement assistance message, and the port is port0. , portl, port2, or port3, generate local CRS corresponding to the corresponding port according to different ports.
  • step S403 is performed to correlate the received PRS signal with the local PRS signal.
  • the first correlation value is related to the received CRS signal and the local CRS signal to obtain a second correlation value, and the reference signal time difference measurement is performed according to the first correlation value and the second correlation value.
  • the received CRS signal is correlated with the local CRS signal to obtain a second correlation value, and the reference signal time difference is measured according to the first correlation value and the second correlation value.
  • FIG. 5 including:
  • the generated local CRS and PRS signals carry a CP
  • the corresponding received signal also carries the CP to participate in the correlation operation, ensuring that the two operands of the correlation operation are equal in length, and vice versa.
  • the result is also complex.
  • Coherent accumulation of complex correlation results is performed in one sub-frame. That is, the first correlation result and the second correlation result correspond to the phase port.
  • the positioning reference signal measurement opportunity includes a plurality of positioning reference signal sub-frames
  • the real correlation results in the plurality of different positioning reference signal sub-frames are accumulated.
  • the peak position may be considered as the subframe arrival time of the corresponding base station positioning reference signal, and the arrival time of the earliest path may also be estimated based on the peak position.
  • step S403 a portion of the received CRS signal transmitted in the non-control channel region is correlated with a portion of the local CRS signal transmitted in the non-control channel region to obtain a second correlation value.
  • the 3 OFDM symbols of the port port0 or port1 including the CRS are #4 symbols in the even time slot for the normal subframe, #0, #4 symbols in the odd time slot, and the extended subframe It is an even time slot #3 symbol, an odd time slot #0, #3 symbol.
  • Ports 2 and port 3 for CRS are 1 OFDM symbol, that is, #1 symbol in odd time slots.
  • the UE since the PRS occupies symbols other than the control channel occupied by the CRS in the subframe and is transmitted on the same port as the CRS, the UE performs 3 OFDMs of the CRS in the non-control channel. The symbol and the 5-8 OFDM symbols of the PRS are correlated to improve the correlation of the signal.
  • Figure 6 shows the assumption that the PRS and CRS powers are the same, the bandwidth is the same, the normal subframe, the CRS signal 1 antenna port, the PRS signal is transmitted by portO, and the correlation characteristics of the signals in one subframe. It can be seen that the left picture clearly has a secondary peak in the correlation window, and after combining the CRS and PRS signals, the apparent energy of the secondary peak is reduced, the energy of the main peak is increased in energy, and the related energy of the three CRS symbols is increased.
  • the embodiment of the present invention further provides a base station, where the structure of the base station is as shown in FIG. 7 , including: a signal generating unit 701, generating a cell-specific reference signal CRS, and a positioning reference signal PRS; and a signal sending unit 702
  • the CRS signal is transmitted on one or more ports for transmitting CRS signals, and the PRS signals are transmitted on a port for transmitting CRS.
  • the foregoing base station is used to implement the terminal positioning method described in the embodiment of FIG. 3.
  • Each of the units is divided according to functional logic, but is not limited to the foregoing, as long as it can be implemented.
  • the corresponding functions may be used; in addition, the specific names of the functional units are only for the purpose of distinguishing from each other, and are not intended to limit the scope of protection of the present invention.
  • the embodiment of the present invention further provides a user equipment, where the user equipment structure is as shown in FIG. 8. Show, including:
  • the receiving unit 801 is configured to receive a positioning reference signal subframe that is sent by the base station, where the positioning reference signal subframe includes a PRS signal sent on a port for transmitting the CRS, and is used to send the CRS signal in one or more The CRS signal sent by the port;
  • the user equipment Since a plurality of base stations send a positioning reference signal subframe in the positioning reference signal measurement opportunity, the user equipment receives the positioning reference signal sent by multiple base stations.
  • a local signal generating unit 802 configured to generate a local PRS signal and a local CRS signal sent in a PRS bandwidth on the port;
  • the terminal can process the local PRS signal and CRS signal of multiple base stations in parallel or serially.
  • an operation unit 803 configured to correlate the received PRS signal and the local PRS signal to obtain a first correlation value, and correlate the received CRS signal and the local CRS signal to obtain a second correlation value according to the first correlation value.
  • the reference signal time difference measurement is performed with the second correlation value.
  • the user equipment may process the PRS signal received from the plurality of base stations in parallel or serially to obtain a first correlation value, and correlate the received CRS signal with the local CRS signal to obtain a second correlation value.
  • the arrival time of the plurality of cells is obtained, and the time difference of arrival of the reference cells therein is calculated, that is, the reference signal arrival time difference RSTD.
  • the user equipment may further include an auxiliary receiving unit, configured to receive a measurement assistance message sent by the network side, to learn, according to the measurement assistance message, a correspondence between a port that the base station sends the PRS signal and a port that sends the CRS signal.
  • an auxiliary receiving unit configured to receive a measurement assistance message sent by the network side, to learn, according to the measurement assistance message, a correspondence between a port that the base station sends the PRS signal and a port that sends the CRS signal.
  • the embodiment of the present invention further provides a base station, where the base station 900 includes: a baseband processing unit 901, performs baseband signal processing, and performs: Generating a cell-specific reference signal CRS;
  • the RF front end 902 and the antenna 903 are configured to modulate the baseband signal onto the carrier frequency, transmit on the antenna port, and execute:
  • the CRS signal is transmitted at one or more ports for transmitting CRS signals.
  • an embodiment of the present invention further provides a user equipment.
  • the user equipment 100 includes: a baseband processing unit 1001, performs baseband signal processing, and performs:
  • the second correlation value, the reference signal time difference measurement is performed according to the first correlation value and the second correlation value.
  • the RF front end 1002 and the antenna 1003 are configured to demodulate the signal received on the receiving antenna port into a baseband signal, and perform:
  • the PRS signal transmitted on the port of the CRS, and the CRS signal transmitted at one or more ports for transmitting the CRS signal are provided.
  • RAM random memory Memory
  • ROM read only memory
  • EEPROM electrically programmable ROM
  • EEPly erasable programmable ROM registers
  • hard disk hard disk
  • removable disk CD-ROM

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

本发明涉及一种终端定位方法,所述方法包括:生成小区特定参考信号CRS,将所述CRS信号在一个或多个用于发送CRS信号的端口发送;生成定位参考信号PRS,将所述PRS信号在一个用于发送CRS的端口发送。本发明实施例提供的终端定位方法,可以减少由于PRS发送符号数受限的影响,增加一个子帧内可以用于定位的参考信号符号数,从而降低副峰影响,增强主峰能量。

Description

终端定位方法、 基站及用户设备 本申请要求于 2008 年 08 月 20 日提交中国专利局、 申请号为 201210296773.X,发明名称为"终端定位方法、基站及用户设备"的中国专利 申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信领域, 具体涉及一种终端定位方法、 基站以及用户设 备。 背景技术
长期演进技术(Long Term Evolution, LTE ) 中, 提出了一发射定位 参考信号 ( Position Reference Signal , PRS ), 用以实现观测到达时间差 ( Observation Time Difference of Arrival, OTDOA )定位技术, 其应用架构 如图 1所示。 OTDOA定位系统包括基站, 终端, 网络侧定位服务器三种设 备。 OTDOA定位技术是一中终端辅助的定位方法, 即终端进行参考信号到 达时间差( Reference Signal Time Difference , RSTD )测量 , 网络侧定位服 务器根据 RSTD测量结果进行 UE位置估计。
多个基站发射定位参考信号子帧( Position Reference Signal Subframe ), 用于终端定位。 这个时间段称为 PRS测量机会 ( occasion ), 一个 PRS测量 机会包括一个或多个定位参考信号子帧 ( Position Reference Signal Subframe )。
网络侧定位服务器发送测量辅助消息, 通知终端各基站发送定位参考 信号子帧的配置。
终端根据辅助消息,接收 PRS测量机会内各基站发送的下行子帧信号, 测量各基站发送 PRS子帧的 PRS参考信号到达时间差 (Reference Signal Time Difference , RSTD )并上才艮给网络侧。 网络侧根据 RSTD进行双曲线 定位, 获得估计的终端位置。 UE通过测量接收到的 PRS和本地 PRS相关, 并通过相关峰的位置, 获得 RSTD。 是否能获得正确的相关峰的位置, 受到 PRS信号的自相关特 性影响, 并随着定位参考信号子帧子帧内 PRS的个数增加而增强, 以及定 位参考信号子帧个数增加而增强。 因此 RSTD测量的检测概率受到一个子 帧内能够用于测量的 PRS参考信号的符号数目限制。 但是 PRS是 R9新引 人的参考信号, 协议规定定位参考信号要兼容 R8的设计。 PRS不能在小区 特定参考信号 (Cell-Specific Reference Signal, CRS)所在的符号发送。 用于 测量的参考信号的符号数目受到限制, 进而影响 RSTD测量的检测概率。 发明内容
本发明的目的是提供一种终端定位方法, 以解决现有技术终端定位时 定位参考信号 PRS符号数较少, 影响 RSTD测量的检测概率的问题。
一方面, 本发明实施例提供了一种终端定位方法, 所述方法包括: 生成小区特定参考信号 CRS, 将所述 CRS信号在一个或多个用于发送 CRS信号的端口发送;
生成定位参考信号 PRS,将所述 PRS信号在一个用于发送 CRS的端口 发送。
另一方面, 本发明实施例提供了一种终端定位方法, 所述方法包括: 接收定位参考信号子帧, 所述定位参考信号子帧包含在一个用于发送
CRS的端口上发送的 PRS信号,和在一个或多个用于发送 CRS信号的端口 发送的 CRS信号;
产生所述端口上 PRS带宽内发送的本地 PRS信号和本地 CRS信号; 将接收到的所述 PRS信号和本地 PRS信号相关得到第一相关值, 将接 收到的 CRS信号和本地 CRS信号相关得到第二相关值、依照所述第一相关 值和所述第二相关值进行参考信号时间差测量。
再一方面, 本发明实施例提供一种基站, 其包括: 信号生成单元, 生成小区特定参考信号 CRS, 和定位参考信号 PRS; 信号发送单元,用以将所述 CRS信号在一个或多个用于发送 CRS信号 的端口发送, 将所述 PRS信号在一个用于发送 CRS的端口发送。
又一方面, 本发明实施例还提供一种用户设备, 其包括:
接收单元, 用以接收基站下发的定位参考信号子帧, 所述定位参考信 号子帧包含在一个用于发送 CRS的端口上发送的 PRS信号,和在一个或多 个用于发送 CRS信号的端口发送的 CRS信号;
本地信号生成单元, 用以产生所述端口上 PRS带宽内发送的本地 PRS 信号和本地 CRS信号;
运算单元, 用于将接收到的所述 PRS信号和本地 PRS信号相关得到第 一相关值, 将接收到的 CRS信号和本地 CRS信号相关得到第二相关值、依 照所述第一相关值和所述第二相关值进行参考信号时间差测量。
又一方面, 本发明实施例还提供一种基站, 其包括:
基带处理单元, 进行基带信号处理, 执行:
生成小区特定参考信号 CRS;
生成定位参考信号 PRS;
射频前端和天线, 用于将基带信号调制到载频上, 在天线端口上发送, 执行:
将所述 PRS信号在一个用于发送 CRS的端口发
将所述 CRS信号在一个或多个用于发送 CRS信号的端口发送; 又一方面, 本发明实施例还提供一种用户设备, 其包括:
基带处理单元, 进行基带信号处理, 并执行:
产生所述端口上 PRS带宽内发送的本地 PRS信号和本地 CRS信号; 将接收到的所述 PRS信号和本地 PRS信号相关得到第一相关值, 将接 收到的 CRS信号和本地 CRS信号相关得到第二相关值、依照所述第一相关 值和所述第二相关值进行参考信号时间差测量; 射频前端和天线, 用于将接收天线端口上接收到的信号, 解调为基带 信号, 执行:
接收定位参考信号子帧, 所述定位参考信号子帧包含在一个用于发送
CRS的端口上发送的 PRS信号,和在一个或多个用于发送 CRS信号的端口 发送的 CRS信号。
本发明实施例提供的终端定位方法, 通过基站限制发送 CRS的端口和 发送 PRS的端口为相同的天线端口, 使得接收终端能够相关合并接收到的 基站在相应的天线端口上发送的 CRS和 PRS在各符号上的相关值,减少由 于 PRS发送符号数受限的影响, 增加一个子帧内可以用于定位的参考信号 符号数, 从而降低副峰影响, 增强主峰能量。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例或现 有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中 的附图仅仅是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不 付出创造性劳动性的前提下, 还可以根据这些附图获得其他的附图。
图 1为终端定位方法的系统架构图;
图 2为本普通子帧中的 CRS和 PRS的符号对应图;
图 3为本发明实施例提供的终端定位方法一实施例的流程图; 图 4为本发明实施例提供的终端定位方法另一实施例的流程图; 图 5是本发明实施例提供的终端定位方法中接收端相关合并的流程图; 图 6是釆用本发明实施例提供的终端定位方法的效果对比图; 图 7是本发明实施例提供的基站一实施例的结构图;
图 8是本发明实施例提供的用户设备一实施例的结构图。
图 9是本发明实施例提供的基站另一实施例的结构图;
图 10是本发明实施例提供的用户设备另一实施例的结构图。 具体实施方式
下面通过附图和实施例, 对本发明的技术方案做进一步的详细描述。 在 OTDOA定位技术中, 由于 PRS是 R9新引人的参考信号, 协议规 定定位参考信号要兼容 R8 的设计。 PRS 不能在小区特定参考信号 (Cell-Specific Reference Signal, CRS)所在的符号发送。 而且为了提高定位 参考信号的相关特性, 协议在非控制信道所在的符号上 PRS带宽内数据保 持空载, 即 PRS带宽内除了主同步信号 ( Primary Synchronization Signal , PSS ), 辅助同步信号(Secondary Synchronization Signal, SSS ), CRS, PRS 几种参考信号之外, 不发送其他数据。
如图 2所示, 由于目前定位参考信号 PRS的发送必须避免控制信道和 CRS信号所在的符号, 因此在一个子帧内的普通子帧 14个 OFMD符号或 扩展子帧的 12个 OFMD号中, 在使用 PORT0~PORTl中的 1个或 2个天 线发送 CRS 占了时占了 4个符号, 在使用 4天线发送 CRS时, 天线端口 PORT0-PORT3占了 6个符号,被控制信道占用了前三个符号, 其中一个符 号和 CRS相同为符号 0。 因此一个子帧内能够用于 PRS在 PORT6发送的 符号为 8、 7、 6或者 5个 OFMD符号。 因此定位参考信号的相关性受到一 个子帧内能够用于 PRS发送的符号数目限制。 图注 210中指出了图 2中所 表示的参考信号: PRS、 CRS、 物理控制格式指示符信道 PCFICH、 物理下 行链路控制信道 PDCCH和物理混合自动重传请求指示符信道 PHICH, 以 上三种信道为控制信道。
因此, 本发明实施例的基本思想就是将 PRS信号在一个用于发送 CRS 的端口发送, 使得终端将接收定位参考信号子帧进行相关合并, 增加一个 子帧内可以用于定位的参考信号符号数。
图 3是本发明实施例提供的一种终端定位方法的流程图, 本实施例的 执行主体为通信系统中的基站, 例如图 1中的基站 102, 由图可见所述方法 包括:
S301 , 生成小区特定参考信号 CRS , 将所述 CRS信号在一个或多个用 于发送 CRS信号的端口发送;
具体而言, 在本步骤中, 生成 CRS信号是指生产含有 CRS信号的正交 频分复用 OFDM符号,之后,将所述含有 CRS信号的符号在一个或多个用 于发送 CRS信号的端口发送。
更具体的, CRS在子帧内占的 /符号数在协议 3GPP TS 36.211中由如 下方程给出, /?表示天线端口, 表示一个时隙中包含符号数, 普通子帧 为 7 , 扩展子帧为 6.偶数时隙的前三个符号是控制区域, 即 #0,#1,#2为控制 信道区域, 发送控制信道信息。
Figure imgf000007_0001
基站根据物理小区标识 ( Physcal Cell Indentify , PCID ), 时隙号 时隙内符号 /, 端口号;?, 对应生成 CRS的扰码序列, 将生成的扰码序列进 行 QPSK调制之后, 根据不同的天线端口号, 将 QPSK符号映射到资源单 元(Resource Element , RE )上, 将资源单元通过傅里叶逆变换变换到时 域, 加上循环前缀 (Cyclic Prefix ,CP)后生成 OFDM符号。
一个 OFDM符号中除了包括参考信号, 还有控制信道和数据信道上的 RE需要映射。 对于 CRS来说, 有控制信道和 PRS带宽外的数据信道上的 RE需要映射。 完成映射后, 将包含 CRS的 OFDM符号在对应 CRS的端口 发送。
简单的说, 如果 CRS在 1天线端口上发送, 则 p=0, 表示 portO, 如果 CRS在 2天线端口上发送, 则 ρ=0,1 , 分别对应 portO和 portl两个天线端 口 。 如果 CRS 在 4 个天线端口上发送, 则 p=0,l,2,3, 分别对应 port0,portl,port2和 ort3四个天线端口。
S302、 生成定位参考信号 PRS, 将所述 PRS信号在一个用于发送 CRS 的端口发送;
具体而言, 生产 PRS信号是指生成含有定位参考信号 PRS的正交频分 复用 OFDM符号, 将所述含有 PRS的符号在一个用于发送 CRS的端口发 送。
具体的, PRS在子帧内占的 /符号数在协议 3GPP TS 36.211中由如下 方程给出, 标示时隙号,根据 PBCH ( Physical Broadcast Channel )发射天 线端口数不同, 子帧类型不同, 发送的符号为 8, 7, 6或 5个 OFMD符号。
PBCH发射天线端口和 CRS发射端口相同。
普通子帧: I = and (1 or 2 PBCH antenna ports)
Figure imgf000008_0001
and (4 PBCH antenna ports) 扩展子帧:
4,5 if «smod 2 = 0
I = 11,2,4,5 if «smod 2 = 1 and (1 or 2 PBCH antenna ports)
2,4,5 if «smod 2 = 1 and (4 PBCH antenna ports) 基站根据物理小区标识( Physcal Cell Indentify PCID ), 时隙号, 时隙内 符号号, 对应生成 PRS的扰码序列, 将生成的扰码序列进行 QPSK调制之 后, 将 QPSK符号映射到资源单元(Resource Element , RE )上, 将资源 单元通过傅里叶逆变换变换到时域, 加上循环前缀后生成 OFDM符号。
而 PRS的资源映射和端口号无关, 因此可以在不知道端口的情况下进 行资源映射。
一个 OFDM符号中除了包括参考信号, 还有控制信道和数据信道上的 RE需要映射。对于 PRS来说,还有 PRS带宽外的数据信道上的 RE需要映 射。 完成映射后, 将包含 PRS的 OFDM符号在一个 CRS的端口发送。
对于选择那个 CRS端口发送 PRS信号,基站和终端双方可以事先预定 用哪个端口发射, 也可以釆用动态配置的方法进行选择, 在釆用动态配置 选择用于发送 PRS的端口时,还需要通过网络侧向 UE发送测量辅助消息, 向用户设备指示选择的发送端口和发送 CRS信号的端口的对应关系。 比如 指示 PRS发送天线端口为 port0。
简单的说, 可以基站和终端双方事先预定, PRS釆用端口 portO发送。 如果动态配置 PRS发送端口, 就需要根据当前 CRS发送天线数确定, 如果 CRS在 1天线端口上发送, 只有 portO可以配置, 如果 CRS在 2天线 端口上发送, 可以配置 portO或 portl两个天线端口中一个。 如果 CRS在 4 个天线端口上发送, 可以配置 port0,portl,port2和 port3四个天线端口中一 个。
但是由于 portO和 portl的 CRS信号在一个子帧内的 OFDM符号数较 多, 因此对于 CRS在 1天线端口发送时, 优选 PRS釆用 portO发送。 对于 CRS在 2天线或 4天线端口发送时,除了优选 PRS釆用 portO发送, 还可以 选择 PRS釆用 portl发送。
需要指出的是, 在本实施例中 S301和 S302并无时序关系, 只是为了 便于说明, 按照前述的顺序进行描述。
通过上述实施例, 由于 PRS在一个用于发送 CRS的端口发送。, 因此 UE可以将 CRS在非控制信道内的 3个 OFDM符号和 PRS的 5-8个 OFDM 符号, 用于 RSTD测量, 提高参考信号的相关性。
图 4是本发明实施例提供的一种终端定位方法另一实施例的参考图, 本实施例的执行主体为用户设备, 例如图 1中的 UE116或者 UE122, 所述 方法包括:
步骤 S401 , 接收定位参考信号子帧;
具体的, 接收本次定位参考信号测量机会中包含的多个基站发送的一 个或多个定位参考信号子帧。
在定位参考信号子帧中, 和其他子帧相同也包括控制信道和数据信道。 和普通子帧不同, 定位参考信号子帧不仅包括 CRS, 还包括 PRS。 具体的, 所述定位参考信号子帧包含在一个用于发送 CRS的端口发送 的 PRS信号的 OFDM符号, 和在一个或多个用于发送 CRS信号的端口发 送的 CRS信号的 OFDM符号;
UE在 PRS机会中接收到定位基站在同一端口中下发的 PRS和 CRS信 号, 包括多个子帧,每个子帧中都包含承载 CRS的 OFDM符号和承载 PRS 的 OFDM符号。
步骤 S402, 产生所述端口上 PRS带宽内发送的本地 PRS信号和本地 CRS信号。
具体的, 在接收基站下发的 PRS和 CRS之前或者在接收 PRS和 CRS 信号的同时, UE也产生本地参考信号, 即本地 PRS信号和本地 CRS信号。
本地 CRS信号产生是仅产生 PRS带宽内, 和 PRS信号对应端口上的 多个 OFDM符号。 首先根据端口号确定所在子帧内 OFDM符号 /, 产生扰 码, 将扰码进行 QPSK调制, 根据端口号进行资源映射, 然后在通过 IFFT 变换获得时域信号。 本地 CRS信号可以带 CP, 也可以不带 CP。
和本地 CRS信号产生类似, PRS信号的产生也只有一个端口。 本地 PRS信号的产生方法是首先产生扰码, 将扰码进行 QPSK调制, 根据端口 号进行资源映射, 然后在通过 IFFT变换获得时域信号。 本地 CRS信号可 以带 CP, 也可以不带 CP。
由于 CRS和 PRS都釆用相同的 gold序列, 并且 gold的初始值获得方 法相同, 因此 CRS和 PRS可以共用相同的 4尤码产生单元, 输入对应的时隙 号和时隙中符号数, 产生不同符号上的扰码序列。。
在此步骤之前,如果基站是动态配置的发送端口,则 UE还需要接收基站下 发的测量辅助消息, 用以依据该测量辅助消息获知基站选择的发送 PRS信 号和 CRS信号的端口, 端口为 port0、 portl、 port2或者 port3 , 依据端口不 同产生对应相应端口的本地 CRS。
之后,执行步骤 S403, 将接收到的所述 PRS信号和本地 PRS信号相关得到 第一相关值, 将接收到的 CRS信号和本地 CRS信号相关得到第二相关值、 依照所述第一相关值和所述第二相关值进行参考信号时间差测量。
更具体的, 将接收到的 CRS信号和本地 CRS信号相关得到第二相关值、依 照所述第一相关值和所述第二相关值进行参考信号时间差测量, 具体可以 参考图 5 , 包括:
5501 , 将接收到的同一子帧中的 PRS信号和本地 PRS信号相关, 并将接收 到的同一子帧中的 CRS信号和本地 CRS信号相关;
产生的本地 CRS和 PRS信号如果带 CP,则对应接收信号也带 CP参与相关 运算, 保证相关运算的两个操作数等长, 反之亦然。
5502, 累加同一子帧内的复数相关结果;
由于接收到的信号和本地信号都是复数, 相关后结果也是复数。 在一个子 帧内釆用复数相关结果相干累加。 即, 第一相关结果和第二相关结果对应 相力口。
S503, 对所述同一子帧内的复数相关结果进行平方运算处理;
累加了第一相关结果和第二相关结果的复数相关结果后, 进行平方运算, 获得实数的相关结果。
5504, 累加多个不同子帧的平方运算处理结果;
如果本次定位参考信号测量机会包含多个定位参考信号子帧, 则累加多个 不同定位参考信号子帧内的实数相关结果。
5505 , 依据所述平方运算处理结果获取峰值位置;
寻找本次定位参考信号测量机会内相关结果中的峰值位置。
5506, 依据所述峰值获位置取一个小区的到达时间;
可以认为峰值位置就是该对应基站定位参考信号的子帧到达时间, 也可以 根据该峰值位置估计出最早路径的到达时间。
5507 , 根据多个小区的所述到达时间获得参考信号到达时间差 RSTD。 重复步骤 S501~507获得多个小区的所述到达时间,计算和其中的参考小区 的到达时间差, 即参考信号到达时间差 RSTD。
在步骤 S403 中, 将接收到的 CRS信号中在非控制信道区域中发送的 部分与所述本地 CRS信号在非控制信道区域中发送的部分相关, 得到第二 相关值。
对于非控制信道区域中区域内, 包括 CRS的端口 portO或 portl的 3个 OFDM符号,对于普通子帧是偶数时隙中 #4符号,奇数时隙中 #0, #4符号; 对于扩展子帧是偶数时隙 #3符号, 奇数时隙中 #0 , #3符号。对于 CRS的端 口 port2和 port3为 1个 OFDM符号 , 即奇数时隙中 #1符号。
通过上述实施例, 由于 PRS占用了子帧中控制信道之外的除了 CRS所 占用的符号之外的符号, 并且和 CRS在同一个端口发送, 因此 UE将 CRS 在非控制信道内的 3个 OFDM符号和 PRS的 5-8个 OFDM符号,进行相关 运算, 提高信号的相关性。
图 6给出假设 PRS和 CRS功率相同, 带宽相同的情况下, 普通子帧, CRS信号 1天线端口, PRS信号釆用 portO发送, 一个子帧内信号的相关特 性。可以看到左图在相关窗内明显有副峰,而釆用 CRS和 PRS信号合并后, 副峰明显能量降低, 主峰能量提高在能量, 提升了 3个 CRS符号的相关能 量。
相应的, 本发明实施例还提供一种基站, 所述基站结构如图 7所示, 包括: 信号生成单元 701 , 生成小区特定参考信号 CRS, 和定位参考信号 PRS; 信号发送单元 702 , 将所述 CRS信号在一个或多个用于发送 CRS信号的端 口发送, 将所述 PRS信号在一个用于发送 CRS的端口发送。
但是需要指出的是, 上述的基站是用来实现图 3 述实施例所述的终端 定位方法, 其中的每个单元只是按照功能逻辑进行划分的, 但并不局限于 上述的划分, 只要能够实现相应的功能即可; 另外, 各功能单元的具体名 称也只是为了便于相互区分, 并不用于限制本发明的保护范围。
相应的, 本发明实施例还提供一种用户设备, 所述用户设备结构如图 8所 示, 包括:
接收单元 801 , 用以接收基站下发的定位参考信号子帧, 所述定位参考信号 子帧包含在一个用于发送 CRS的端口上发送的 PRS信号,和在一个或多个 用于发送 CRS信号的端口发送的 CRS信号;
由于多个基站在定位参考信号测量机会中都会发送定位参考信号子帧, 因 此用户设备会接收到多个基站发送的定位参考信号。
本地信号生成单元 802, 用以产生所述端口上 PRS带宽内发送的本地 PRS信号和本地 CRS信号;
终端可以并行或串行的处理多个基站的本地 PRS信号和 CRS信号产 生。
以及运算单元 803 , 用于将接收到的所述 PRS信号和本地 PRS信号相 关得到第一相关值,将接收到的 CRS信号和本地 CRS信号相关得到第二相 关值、 依照所述第一相关值和所述第二相关值进行参考信号时间差测量。 用户设备可以并行或串行的处理从多个基站接收到的所述 PRS信号和本地 PRS信号相关得到第一相关值,将接收到的 CRS信号和本地 CRS信号相关 得到第二相关值。 获得多个小区的所述到达时间, 计算和其中的参考小区 的到达时间差, 即参考信号到达时间差 RSTD。
此外, 用户设备还可以包括一个辅助接收单元, 用以接收网络侧发送 的测量辅助消息, 用以依据该测量辅助消息获知基站发送 PRS信号的端口 和发送 CRS信号的端口的对应关系。
但是需要指出的是, 上述的用户设备是用来实现图 4述实施例所述的 终端定位方法, 其中的每个单元只是按照功能逻辑进行划分的, 但并不局 限于上述的划分, 只要能够实现相应的功能即可; 另外, 各功能单元的具 体名称也只是为了便于相互区分, 并不用于限制本发明的保护范围。
此外, 请参考图 9, 本发明实施例还提供一种基站, 基站 900包括: 基带处理单元 901 , 进行基带信号处理, 执行: 生成小区特定参考信号 CRS;
生成定位参考信号 PRS。
射频前端 902和天线 903 , 用于将基带信号调制到载频上, 在天线端口 上发送, 执行:
将所述 PRS信号在一个用于发送 CRS的端口发
将所述 CRS信号在一个或多个用于发送 CRS信号的端口发送。
请参考图 10 , 本发明实施例还提供一种用户设备, 用户设备 100包括: 基带处理单元 1001 , 进行基带信号处理, 并执行:
产生所述端口上 PRS带宽内发送的本地 PRS信号和本地 CRS信号; 将接收到的所述 PRS信号和本地 PRS信号相关得到第一相关值, 将接 收到的 CRS信号和本地 CRS信号相关得到第二相关值、依照所述第一相关 值和所述第二相关值进行参考信号时间差测量。
射频前端 1002和天线 1003 , 用于将接收天线端口上接收到的信号, 解 调为基带信号, 执行:
接收定位参考信号子帧, 所述定位参考信号子帧包含在一个用于发送
CRS的端口上发送的 PRS信号,和在一个或多个用于发送 CRS信号的端口 发送的 CRS信号。
专业人员应该还可以进一步意识到, 结合本文中所公开的实施例描述 的各示例的单元及算法步骤, 能够以电子硬件、 计算机软件或者二者的结 合来实现, 为了清楚地说明硬件和软件的可互换性, 在上述说明中已经按 照功能一般性地描述了各示例的组成及步骤。 这些功能究竟以硬件还是软 件方式来执行, 取决于技术方案的特定应用和设计约束条件。 专业技术人 员可以对每个特定的应用来使用不同方法来实现所描述的功能, 但是这种 实现不应认为超出本发明的范围。
结合本文中所公开的实施例描述的方法或算法的步骤可以用硬件、 处 理器执行的软件模块, 或者二者的结合来实施。 软件模块可以置于随机存 储器(RAM )、 内存、 只读存储器(ROM )、 电可编程 ROM、 电可擦除可 编程 ROM、 寄存器、 硬盘、 可移动磁盘、 CD-ROM、 或技术领域内所公知 的任意其它形式的存储介质中。
以上所述的具体实施方式, 对本发明的目的、 技术方案和有益效果进 行了进一步详细说明, 所应理解的是, 以上所述仅为本发明的具体实施方 式而已, 并不用于限定本发明的保护范围, 凡在本发明的精神和原则之内, 所做的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求
1、 一种终端定位方法, 其特征在于, 所述方法包括:
生成小区特定参考信号 CRS , 将所述 CRS信号在一个或多个用于发送 CRS信号的端口发送;
生成定位参考信号 PRS ,将所述 PRS信号在一个用于发送 CRS的端口 发送。
2、 如权利要求 1所述的终端定位方法,其特征在于,所述一个用于发 送 CRS的端口为端口 0。
3、 一种终端定位方法, 其特征在于, 所述方法包括:
接收定位参考信号子帧, 所述定位参考信号子帧包含在一个用于发送 CRS的端口上发送的 PRS信号,和在一个或多个用于发送 CRS信号的端口 发送的 CRS信号;
产生所述用于发送 CRS的端口上 PRS带宽内发送的本地 PRS信号和 本地 CRS信号;
将接收到的所述 PRS信号和本地 PRS信号相关得到第一相关值, 将接 收到的 CRS信号和本地 CRS信号相关得到第二相关值,依照所述第一相关 值和所述第二相关值进行参考信号时间差测量。
4、 如权利要求 3所述的终端定位方法, 其特征在于, 在所述的将接收 到的 CRS信号和本地 CRS信号相关得到第二相关值中具体为:
将接收到的 CRS 信号中在非控制信道区域中发送的部分与所述本地 CRS信号在非控制信道区域中发送的部分相关, 得到第二相关值。
5、 如权利要求 3或 4所述的终端定位方法, 其特征在于, 还包括: 接收网络侧发送的测量辅助消息, 用以依据该测量辅助消息获知基站 发送 PRS信号的端口和发送 CRS信号的端口的对应关系。
6、 如权利要求 4或 5所述的终端定位方法, 其特征在于, 所述参考信号时 间差测量具体包括:
将接收到的同一子帧中的所述 PRS信号和本地 PRS信号相关, 并将接收到 的同一子帧中的所述 CRS信号和本地 CRS信号相关;
累加同一子帧内的复数相关结果;
对所述同一子帧内的复数相关结果进行平方运算处理;
累加多个不同子帧的平方运算处理结果;
依据所述平方运算处理结果获取峰值位置;
依据所述峰值位置获取一个小区的参考信号到达时间;
根据多个小区的所述参考信号到达时间获得参考信号到达时间差。
7、 一种基站, 其特征在于, 包括:
信号生成单元, 生成小区特定参考信号 CRS, 和定位参考信号 PRS; 信号发送单元,用以将所述 CRS信号在一个或多个用于发送 CRS信号 的端口发送, 将所述 PRS信号在一个用于发送 CRS的端口发送。
8、 一种用户设备, 其特征在于, 包括:
接收单元, 用以接收基站下发的定位参考信号子帧, 所述定位参考信 号子帧包含在一个用于发送 CRS的端口上发送的 PRS信号,和在一个或多 个用于发送 CRS信号的端口发送的 CRS信号;
本地信号生成单元, 用以产生所述端口上 PRS带宽内发送的本地 PRS 信号和本地 CRS信号;
运算单元, 用于将接收到的所述 PRS信号和本地 PRS信号相关得到第 一相关值, 将接收到的 CRS信号和本地 CRS信号相关得到第二相关值、依 照所述第一相关值和所述第二相关值进行参考信号时间差测量。
9、 如权利要求 8所述的用户设备, 其特征在于, 还包括:
辅助接收单元, 用以接收网络侧发送的测量辅助消息, 用以依据该测 量辅助消息获知基站发送 PRS信号的端口和发送 CRS信号的端口的对应关 系。
10、 一种基站, 其特征在于, 包括:
基带处理单元, 进行基带信号处理, 执行:
生成小区特定参考信号 CRS;
生成定位参考信号 PRS;
射频前端和天线, 用于将基带信号调制到载频上, 在天线端口上发送, 执行:
将所述 PRS信号在一个用于发送 CRS的端口发
将所述 CRS信号在一个或多个用于发送 CRS信号的端口发送。
11、 一种用户设备, 其特征在于, 包括:
基带处理单元, 进行基带信号处理, 并执行:
产生所述端口上 PRS带宽内发送的本地 PRS信号和本地 CRS信号; 将接收到的所述 PRS信号和本地 PRS信号相关得到第一相关值, 将接 收到的 CRS信号和本地 CRS信号相关得到第二相关值、依照所述第一相关 值和所述第二相关值进行参考信号时间差测量;
射频前端和天线, 用于将接收天线端口上接收到的信号, 解调为基带 信号, 执行:
接收定位参考信号子帧, 所述定位参考信号子帧包含在一个用于发送 CRS的端口上发送的 PRS信号, 和在一个或多个用于发送 CRS信号的端口发 送的 CRS信号。
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CN103634899B (zh) 2018-04-27
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