CN102711242A - Method for measuring time of arrival of reference signal of position neighbor cell, and terminal - Google Patents
Method for measuring time of arrival of reference signal of position neighbor cell, and terminal Download PDFInfo
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Abstract
The invention provides a method for measuring the time of arrival of a reference signal of a position neighbor cell, and a terminal. The method comprises the following steps of: receiving an observation time difference of arrival measurement assisting message, wherein the message comprises position reference cell information and position neighbor cell information; receiving a signal comprising a position reference signal of the position neighbor cell in a measurement chance; according to the observation time difference of arrival measurement assisting message, judging whether a position reference cell is a serving cell or not and whether the position reference cell and the position neighbor cell are in the measurement chance of the same frequency layer or not; if the position reference cell is the serving cell, and the position reference cell and the position neighbor cell are in the measurement chance of the same frequency layer, judging whether an interference starting condition is created or not; and if the interference starting condition is creased, starting local position reference signal-based frequency-domain interference elimination processing or time-domain interference elimination processing on the received signal, otherwise starting interference elimination-free processing. According to the measurement method, the interference of the serving cell in the reference signal of the position neighbor cell is eliminated, and the time of arrival of the reference signal of the position neighbor cell is further measured to position the terminal.
Description
Technical field
The present invention relates to wireless communication technology field, and be particularly related to a kind of measurement and positioning neighbor cell reference signal method and the terminal of the time of advent.
Background technology
Long Term Evolution (Long Term Evolution; LTE) (release 9 for the 9th version; Emission location reference signals (Position Reference Single is proposed R9); PRS), realize that observation arrives time difference (Observation Time Difference of Arrival, OTDOA) location technology.
The OTDOA location technology; It is a kind of localization method based on UE-assisted; The position at terminal in the position fixing process (User Equipment is called for short UE) needs this UE to carry out auxiliary reference signal arrival time difference (Reference Signal Time Different is hereinafter to be referred as RSTD) measurement; Network side estimates the position of UE according to the RSTD result that UE measures.Concrete, existing OTDOA location technology comprises the steps:
1) any one equipment sends Location Request to network side in UE or the network;
2) network side is according to ability or location quality of service (Quality of Service, QoS) the definite location that starts OTDOA of requirement of Location Request and UE;
3) network side sends OTDOA Location Request and location assistance messages to UE, wherein locatees the assistance messages definition and specifically sees 3GPP TS 36.3556.5.1.2;
4) UE carries out RSTD and measures, and report network side after receiving the location assistance messages;
5) network side positions UE according to the RSTD measurement result that UE reports.
The base station is sent in the descending sub frame and is carried PRS, and UE need detect the PRS time of advent that at least three base stations issue, and the PRS of the base station of acquisition location neighbor cell and the base station of position reference sub-district is poor the time of advent.
Wherein, the method for the noiseless elimination of the location reference signals difference time of advent of a sub-district of acquisition comprises the steps:
1) mixed signal of the location reference signals of a plurality of base stations in the one-shot measurement chance in frequency layer of reception, this mixed signal is the reception signal that contains this cell localization reference signal.
2) UE produces the local sequence of the location reference signals of this sub-district according to the PRS information of this sub-district in the assistance messages of location, and concrete grammar is seen among the 3GPP TS 36.2116.10.4 and defined;
3) with local sequence and reception signal correction, obtain the correlation in the corresponding symbol,
4) repeat step 2), 3) interior correlation and the interior correlation of a plurality of subframe of acquisition one sub-frame;
5), obtain location neighbor cell reference signal time of advent according to the correlation in a plurality of subframes.
In said process; Because the signal that contains the PRS subframe that the terminal receives is the signal that serving BS and neighbours base station PRS signal mix; Therefore when the terminal was in the Serving cell central area, the neighbor cell signal of receiving can receive the strong jamming of Serving cell signal.If disturb excessively, the neighbor cell PRS of measurement can make a mistake the time of advent, has influence on final positioning accuracy.
Summary of the invention
The embodiment of the invention provides a kind of measurement and positioning neighbor cell reference signal method of the time of advent; Realize eliminating in the OTDOA location technology of the interference of the location reference signals of Serving cell to the location reference signals of location neighbor cell; And then the accurate time of advent that obtains location neighbor cell reference signal, to realize accurate location to the terminal.
Concrete, the method for the embodiment of the invention provides measurement and positioning neighbor cell reference signal time of advent comprises the following steps:
Receive observation and arrive the time difference measurements assistance messages, said observation arrives the time difference measurements assistance messages and comprises position reference cell information and location neighbor cell message;
Arrive the time difference measurements assistance messages according to said observation, receive the signal of the location reference signals PRS that contains said location neighbor cell in the one-shot measurement chance;
Arrive the time difference measurements assistance messages according to said observation, judge whether said position reference sub-district is Serving cell, and whether said position reference sub-district is in the said one-shot measurement chance of a frequency layer with said location neighbor cell;
If being Serving cell and said position reference sub-district and said location neighbor cell, said position reference sub-district is in the said one-shot measurement chance of said frequency layer; Then further judge whether to satisfy the interference eliminated entry condition; If satisfy the interference eliminated entry condition, then the signal enabling of said reception is eliminated based on the frequency domain interference of local location reference signals and handled or based on the time domain interference elimination treatment of local location reference signals; Otherwise, start noiseless elimination and handle.
In addition, the embodiment of the invention also provides a kind of measurement and positioning neighbor cell reference signal terminal of the time of advent, and this terminal comprises:
Acquiring unit; Be used to obtain observation and arrive the time difference measurements assistance messages; Said observation arrives the time difference measurements assistance messages and comprises position reference cell information and location neighbor cell message, and said acquiring unit also is used to receive the signal that contains the location reference signals of locating neighbor cell in the one-shot measurement chance;
Judging unit is used to judge whether said position reference sub-district is Serving cell, and whether said position reference sub-district is in the said one-shot measurement chance of a frequency layer with said location neighbor cell;
Be in the said one-shot measurement chance of said frequency layer if said position reference sub-district is Serving cell and said position reference sub-district and said location neighbor cell, then said judging unit is further judged the entry condition of interference eliminated; If satisfy, then the signal enabling of said reception is eliminated based on the frequency domain interference of local location reference signals and handled or based on the time domain interference elimination treatment of local location reference signals; If not, then starting noiseless elimination handles;
Interference cancellation unit is used for the signal of said reception is carried out handling or handling based on the time domain interference elimination treatment or the noiseless elimination of local location reference signals based on the frequency domain interference elimination of local location reference signals.
Method and the terminal of the embodiment of the invention provided measurement and positioning neighbor cell reference signal time of advent; The observation that issues according to high level arrives time difference survey supplementary; Judge whether the position reference sub-district is Serving cell; And according to observing arrival time difference measurements assistance messages judge whether the PRS of Serving cell and the PRS of location neighbor cell are in the measuring machine meeting (occasion); Judge further then whether UE satisfies the interference eliminated entry condition; The signal enabling that receives is eliminated based on the frequency domain interference of local location reference signals at last and handled or based on the time domain interference elimination treatment of local location reference signals according to judged result; Realizing eliminating of the interference of the location reference signals of Serving cell in the OTDOA location technology, and then accurately obtain the time of advent of location neighbor cell reference signal to the location reference signals of neighbor cell.
Description of drawings
Fig. 1 is the method flow diagram of measurement and positioning neighbor cell reference signal time of advent of the embodiment of the invention one;
The method flow diagram of Fig. 2 to be the embodiment of the invention two eliminate based on the frequency domain interference of local location reference signals measurement and positioning neighbor cell reference signal time of advent;
Fig. 3 eliminates the measurement and positioning neighbor cell reference signal sketch map of the time of advent based on the frequency domain interference of local location reference signals;
Fig. 4 is the embodiment of the invention three based on the method flow diagram of measurement and positioning neighbor cell reference signal time of advent of the time domain interference eliminated of local location reference signals;
Fig. 5 locatees the neighbor cell reference signal sketch map of the time of advent based on the time domain interference elimination measuring of local location reference signals;
Fig. 6 is the terminal sketch map of measurement and positioning neighbor cell reference signal time of advent of the embodiment of the invention one;
Fig. 7 is the terminal sketch map of measurement and positioning neighbor cell reference signal time of advent of satisfying that frequency domain interference eliminates of the embodiment of the invention two;
Fig. 8 is the terminal sketch map of measurement and positioning neighbor cell reference signal time of advent of satisfying the time domain interference eliminated of the embodiment of the invention three;
Fig. 9 is another measurement and positioning neighbor cell reference signal of the present invention terminal sketch map of the time of advent.
Embodiment
The embodiment of the invention provide a kind of based on local location reference signals interference eliminated and obtain the neighbor cell PRS method of the time of advent; Improve the SINR (Signal to Interference and Noise Ratio Signal to Interference plus Noise Ratio) that measures in the sample; Thereby when there is larger interference in Serving cell to the location neighbor cell; Improve and measure the neighbor cell PRS accuracy of the time of advent, reach the purpose that improves positioning accuracy.
Fig. 1 is the method flow diagram of measurement and positioning neighbor cell reference signal time of advent of the embodiment of the invention one, and as shown in Figure 1, the method for interference eliminated comprises in this navigation system:
Step S 101: receive observation and arrive the time difference measurements assistance messages, and arrive the time difference measurements assistance messages according to this observation, receive the reception signal that the one-shot measurement chance contains the location reference signals of this location neighbor cell.
In this step, UE obtains the high-rise observation that issues and arrives time difference (OTDOA) measurement supplementary, and this observation arrives time difference measurements assistance messages and comprises position reference cell information and location neighbor cell message, specifically sees 3GPP TS 36.3556.5.1.2.
Arrive the time difference measurements assistance messages according to receiving observation, like frequency layer, in the cycle, parameters such as initial subframe number obtain the configuration of measuring machine meeting, and wherein frequency layer is exactly a frequency, same frequency layer, and expression is with frequently; In addition, UE also receives the reception signal of the location reference signals that contains this location neighbor cell in the one-shot measurement chance, and each measuring machine can comprise a plurality of descending sub frames that contain the PRS signal, like 1 ~ 6 descending sub frame.
Step S102: arrive the time difference measurements assistance messages according to said observation, judge whether the position reference sub-district is Serving cell, and whether be in this measuring machine meeting of a frequency layer with the location neighbor cell.
In this step, UE compares physCellID in the position reference cell information, cellGlodballd, and the earfcn field judges whether the position reference sub-district is Serving cell.According in the position reference cell information with the location neighbor cell message in earfcn, and prs-mutingInfo judges that whether this position reference sub-district is in a measuring machine meeting (Occasion) of same frequency layer with the location neighbor cell; If, execution in step S103 then; Otherwise, carry out S105.
Step S103: further judge whether to satisfy the interference eliminated entry condition.
In this step; UE is according to the relation of the Serving cell PRS bandwidth and the PRS bandwidth of location neighbor cell or the relation of the Serving cell PRS descending sub frame number and the PRS descending sub frame number of location neighbor cell; Judge whether to satisfy entry condition based on the interference eliminated of local location reference signals; If, execution in step S104 then; Otherwise, not think and satisfy interference eliminated condition based on local location reference signals, carry out the processing of the noiseless elimination of S105.
Step S104: start to eliminate and handle or based on the time domain interference elimination treatment of local location reference signals based on the frequency domain interference of local location reference signals.
In this step; UE is according to the relation between Serving cell PRS bandwidth of judging among the step S103 and the location neighbor cell PRS bandwidth; Signal enabling to receiving is eliminated based on the frequency domain interference of local location reference signals, to eliminate the interference of Serving cell to the location reference signals of location neighbor cell; Perhaps, according to the relation of the Serving cell PRS descending sub frame number of judging among the step S103, to the signal enabling that receives time domain interference elimination treatment based on local location reference signals with location neighbor cell PRS descending sub frame number.
Step S105 carries out noiseless elimination and handles.
Concrete, the method for noiseless elimination is: UE produces the local sequence of the location reference signals of this location neighbor cell according to the PRS signal of the location neighbor cell in the observation arrival time difference measurements assistance messages; With local sequence with receive signal correction, obtain the correlation in the corresponding symbol, the relevant correlation that obtains said symbol with this symbol corresponding symbol in the symbol that is about to local sequence and the reception signal; Repeat, obtain the correlation of a sub-frame and the correlation in a plurality of subframe; According to the correlation in a plurality of subframes, obtain the time of advent of location neighbor cell reference signal.Symbol in the present embodiment is OFDM (OFDM) symbol.
The method of present embodiment provides measurement and positioning neighbor cell reference signal time of advent; When Serving cell with by the location neighbor cell PRS bandwidth disturbed or descending sub frame number when variant; Based on local location reference signals; Eliminating of the interference of Serving cell PRS signal on the frequency domain or on the time domain, make UE realize accurately location respectively to the location neighbor cell PRS signal that disturbed.
The method flow diagram of Fig. 2 to be the embodiment of the invention two eliminate based on the frequency domain interference of local location reference signals measurement and positioning neighbor cell reference signal time of advent.As shown in Figure 2, the step of this measurement and positioning neighbor cell reference signal time of advent comprises:
Step S201: receive observation and arrive the time difference measurements assistance messages, and arrive the time difference measurements assistance messages, receive the reception signal that the one-shot measurement chance contains the location reference signals of this location neighbor cell according to this reception observation.
In this step, UE obtains the high-rise OTDOA that issues and measures supplementary, measures auxiliary letter and comprises position reference cell information and location neighbor cell message, specifically sees 3GPP TS 36.3556.5.1.2.
Arrive the time difference measurements assistance messages according to receiving observation; Like frequency layer; In the cycle, parameters such as initial subframe number obtain the configuration of measuring machine meeting; UE also arrives the difference measurements assistance messages according to this observation time in addition, receives the reception signal of the location reference signals that contains this location neighbor cell in the one-shot measurement chance.
Step S202: judge whether the position reference sub-district is Serving cell, and whether be in the one-shot measurement chance of a frequency layer with the location neighbor cell.
In this step, UE judges whether the position reference sub-district is Serving cell, and whether is in an Occasion (measuring machine meeting) of same frequency layer with the location neighbor cell; Be, then execution in step S203; Otherwise then thinking does not have strong jamming, execution in step S209.
Step S203: whether PRS bandwidth * first threshold value of judging Serving cell is smaller or equal to the PRS bandwidth of locating neighbor cell.
UE measures the PRS bandwidth of the Serving cell in the supplementary and the PRS bandwidth of location neighbor cell according to OTDOA; Judge whether the PRS bandwidth of Serving cell and the PRS bandwidth of location neighbor cell satisfy the entry condition of eliminating based on the frequency domain interference of local location reference signals, and this condition is specially: PRS bandwidth * first of Serving cell preset the PRS bandwidth of thresholding≤location neighbor cell.If satisfy, then execution in step S204 starts the interference elimination treatment based on the frequency domain of local location reference signals; Otherwise, return step S209.Wherein, the first preset thresholding is the real number greater than 1.
Step S204: arrive the location neighbor cell PRS information in the time difference measurements assistance messages according to observation, produce this locality first frequency domain reference signal of corresponding symbol in the descending sub frame of locating the neighbor cell transmission.
In this step; UE measures initial Slot number (the prs-ConfigurationIndex field) of locating the PRS of this location neighbor cell in the neighbor cell lists (OTDOA-NeighbourCellInfoList) in the assistance messages according to the OTDOA that high level issues; PRS bandwidth (prs-Bandwidth field), PRS descending sub frame number (numDL-Frames field) and cell ID (phyCellid field); Produce this locality first frequency domain reference signal of the interior PRS symbol of numDL-Frames field (descending sub frame) that this location neighbor cell sends, concrete grammar is seen among the 3GPP TS 36.2116.10.4 and is defined.
Step S205: in the local first frequency domain reference signal, the frequency-region signal zero setting in the Serving cell PRS bandwidth, (Inverse fast fourier transform, IFFT) conversion produces the local first time domain reference signal through inverse fast Fourier transform.
In this step, in the local first frequency domain reference signal, the frequency-region signal zero setting in the Serving cell PRS bandwidth produces the local first time domain reference signal through the IFFT conversion.Make the local first time domain reference signal not comprise any signal in the Serving cell frequency band, reach the effect of interference eliminated.
Step S206: the symbol of the local first time domain reference signal is relevant with the corresponding symbol of reception signal, obtain the correlation in the corresponding symbol.
In this step, UE obtains the correlation in the corresponding symbol with the symbol of the first time domain reference signal in the above-mentioned steps and the reception signal correction of time domain.
Step S207: repeating step S204 ~ S206 obtains correlation and the interior correlation of a plurality of subframe in the sub-frame.
In this step, UE repeated execution of steps S204 ~ S206, obtaining correlation and the correlation in a plurality of subframe in the sub-frame, through in the subframe relevant add and subframe between incoherent adding obtain the correlation that many subframes add up.
Step S208:, obtain location neighbor cell reference signal time of advent according to the correlation in a plurality of subframes.
In this step, UE is according to the correlation in a plurality of subframes, estimates footpath time delay the earliest through most powerful path, obtains location neighbor cell reference signal time of advent.
Step S209: carry out the method for noiseless elimination, position the measurement that the neighbor cell reference signal reaches the time.
Concrete, the method for noiseless elimination is: UE produces the local sequence of the location reference signals of this location neighbor cell according to the PRS signal of the location neighbor cell in the observation arrival time difference measurements assistance messages; With local sequence and reception signal correction, obtain the correlation in the corresponding symbol; Repeat, obtain the correlation of a sub-frame and the correlation in a plurality of subframe; According to the correlation in a plurality of subframes, obtain the time of advent of location neighbor cell reference signal.
Fig. 3 eliminates the measurement and positioning neighbor cell reference signal sketch map of the time of advent based on the frequency domain interference of local location reference signals.Please with reference to Fig. 3, transverse axis is frequency (f), and the longitudinal axis is power (p), and dash area 1 is a Serving cell PRS signal bandwidth, and blank parts 2 is location neighbor cell PRS signal bandwidth.
Can be known that by Fig. 3 on frequency domain, PRS bandwidth * first of Serving cell preset thresholding (BW_Fact_TH)≤location neighbor cell PRS bandwidth, concrete, BW_Fact_TH is the real number greater than 1.This bandwidth condition has satisfied the entry condition of eliminating based on the frequency domain interference of local location reference signals.Therefore; In the embodiment of the invention; Initial Slot number (calculating of prs-ConfigurationIndex field) that UE measures the PRS of the location neighbor cell in the assistance messages according to OTDOA, PRS bandwidth (prs-Bandwidth field), PRS descending sub frame number (numDL-Frames field) and cell ID (phyCellid field) produce the frequency-region signal of locating neighbor cell; Be that blank parts 2 bandwidth are with interior signal; And according to the PRS bandwidth of Serving cell, with dash area 1, i.e. frequency-region signal zero setting in the Serving cell PRS bandwidth.That is to say, produce in the neighbor cell PRS bandwidth of location that the frequency-region signal beyond the Serving cell PRS bandwidth obtains this locality first time domain reference signal after the interference eliminated through the IFFT conversion.Then, the symbol of the first time domain reference signal and the reception signal of time domain are asked relevant, obtain peaked position, obtain the most powerful path time delay, estimate footpath time delay the earliest, finally obtain location neighbor cell reference signal time of advent according to the most powerful path time delay.
Fig. 4 is the embodiment of the invention three based on the method flow diagram of measurement and positioning neighbor cell reference signal time of advent of the time domain interference eliminated of local location reference signals.As shown in Figure 4, the step of this measurement and positioning neighbor cell reference signal time of advent comprises:
Step S401: receive observation and arrive the time difference measurements assistance messages, and arrive the time difference measurements assistance messages, receive the reception signal that the one-shot measurement chance contains the location reference signals of this location neighbor cell according to this reception observation.
In this step, UE obtains the high-rise OTDOA that issues and measures supplementary, and this measurement supplementary comprises position reference cell information and location neighbor cell message, specifically sees 3GPP TS36.3556.5.1.2.
Arrive the time difference measurements assistance messages according to receiving observation, like frequency layer, in the cycle, parameters such as initial subframe number obtain the configuration of measuring machine meeting, and UE also receives the reception signal of the location reference signals that contains this location neighbor cell in the one-shot measurement chance in addition.
Step S402: arrive the time difference measurements service message according to observation, judge whether the position reference sub-district is Serving cell, and whether with locate neighbor cell be in a frequency layer the one-shot measurement chance in.
In this step, UE passes through to compare pyhCellID in the position reference cell information, ceddGold, and earfcn judges whether the position reference sub-district is Serving cell; Relatively locate eargcn in the neighbor cell message according to the position reference cell information, prs-mutinInfo judges that whether this Serving cell is in a measuring machine meeting (Occasion) of same frequency layer with the location neighbor cell; If, execution in step S403 then; Otherwise, execution in step S409.
Step S403: whether PRS descending sub frame number * second threshold value of judging Serving cell is smaller or equal to the PRS descending sub frame number of locating neighbor cell.
In this step; Whether satisfied UE measures the fixed position reference signal PRS descending sub frame number of Serving cell in the supplementary and the relation of the PRS descending sub frame number of location neighbor cell according to OTDOA, judge the entry condition of the relation of the PRS descending sub frame number of Serving cell and the PRS descending sub frame number of the locating neighbor cell time domain interference eliminated based on local location reference signals.This condition is specially: PRS descending sub frame number * second of Serving cell preset the PRS descending sub frame number of thresholding≤location neighbor cell.If satisfy, then execution in step S404 starts the interference eliminated based on the time domain of local location reference signals; Otherwise, think no strong jamming, execution in step S409.In the present embodiment, the second preset thresholding is the real number greater than 1.
Step S404: arrive the numDL-Frames field of expectedRSTD field, numDL-Frames field and the Serving cell of the PRS of location neighbor cell in the time difference measurements assistance messages according to observation, judge location neighbor cell reference signal and service cell reference signals expection subframe overlapping time.
Wherein, ExpectedRSTD, span is 0 ~ 16383, and unit is 3Ts, and the time of advent of expression position reference sub-district and Serving cell expectation is poor.The RSTD of expectation can calculate through (ExpectedRSTD-8192), and unit is 3Ts, a Ts=1/ (15000 * 2048) s, and a sub-frame is 30720Ts.
Step S405: arrive the location neighbor cell PRS information in the time difference measurements assistance messages with observation overlapping time according to the expection subframe, produce this locality second frequency domain reference signal that the location neighbor cell sends the PRS symbol of non-expection subframe in overlapping time in the descending sub frame.
In this step; The OTDOA that UE issues according to high level measure the location reference signals of locating this location neighbor cell in the neighbor cell lists (OTDOA-NeighbourCellInfoList) in the assistance messages initial Slot number (prs-ConfigurationIndex field); PRS bandwidth (prs-Bandwith field), PRS descending sub frame number (numDL-Frames field) and cell ID (pyhCellid field), and Serving cell PRS bandwidth; Produce in the corresponding subframe; In the neighbor cell descending sub frame number of location, remove and the Resource Unit the subframe that Serving cell is overlapping (Resource element, the local PRS frequency-region signal on RE); That is, the local second frequency domain reference signal.
Step S406: with the local second frequency-region signal reference signal, through this locality second time domain reference signal after the IFFT conversion generation interference eliminated.
Step S407: with the symbol and the relevant correlation that obtains in the corresponding symbol of the corresponding symbol of reception signal of the local second time domain reference signal.
Step S408: repeated execution of steps S404-S407 to obtain correlation and the correlation in a plurality of subframe in the sub-frame, according to the correlation in a plurality of subframes, obtains location neighbor cell reference signal time of advent.
In this step, UE is through correlation in the sub-frame and the correlation in a plurality of subframe, and then obtains maximum correlation, to obtain the most powerful path time delay, estimates time delay the earliest according to the strongest time delay, finally obtains location neighbor cell reference signal time of advent.
Step S409: carry out the method for noiseless elimination, observe the arrival time difference measurements.
The implementation of this step sees also Fig. 2 and plants step S209.
Fig. 5 locatees the neighbor cell reference signal sketch map of the time of advent based on the time domain interference elimination measuring of local location reference signals.Please with reference to Fig. 5; Transverse axis is time domain (t), and the longitudinal axis is power (p), and dash area 3 is a Serving cell PRS signal downlink subframe; Blank parts 4 is location neighbor cell PRS descending sub frame, and blank parts 4' is the descending sub frame with the overlapping location neighbor cell of Serving cell descending sub frame.
Can know by Fig. 5; On time domain; PRS descending sub frame number * second of Serving cell preset the PRS descending sub frame number of thresholding (SF_Faact_TH)≤location neighbor cell; Concrete, SF_Fact_TH is the real number greater than 1, the condition of this descending sub frame number has satisfied the entry condition based on the time domain interference elimination treatment of local location reference signals.UE measures initial Slot number (calculating according to the prs-ConfigurationIndex field) of the location neighbor cell in the assistance messages according to OTDOA; PRS bandwidth (prs-Bandwidth field); PRS descending sub frame number (numDL-Frames field) and cell ID (pyhCellid field); And the PRS descending sub frame number of Serving cell, produce this locality second frequency domain reference signal that the location neighbor cell sends the PRS symbol of non-expection subframe in overlapping time in the descending sub frame.That is to say; UE will give up the descending sub frame with the overlapping location neighbor cell of Serving cell descending sub frame, that is, blank parts 4'; Only will except that with RE the overlapping subframe of Serving cell on local frequency-region signal, that is remaining 5 blank parts 4 is as the local second frequency domain reference signal.Obtain this locality second time domain reference signal after the interference eliminated through the IFFT conversion.Then,, obtain peaked position, obtain the most powerful path time delay, estimate footpath time delay the earliest, finally obtain location neighbor cell reference signal time of advent according to the most powerful path time delay with the symbol of the local second time domain reference signal and the reception signal correction of time domain.Present embodiment be overlapping fully with a descending sub frame in 6 descending sub frames of descending sub frame and location neighbor cell of expection subframe Serving cell in overlapping time be the method that example is set forth embodiment of the invention practical implementation; Right the present invention is not as limit; In other embodiments; Descending sub frame number in the Serving cell and the descending sub frame number of locating in the neighbor cell, and overlapping state can be decided according to concrete condition.
In the another embodiment of the present invention; If the PRS signal of Serving cell arrives the signal strength signal intensity of UE arrives UE greater than the PRS signal of the location of location neighbor cell signal strength signal intensity 13dB (200 times); Promptly receive reference signal power (Reference Singal Received Power; RSRP) or receive reference signal quality (Referecnce Singal Received Quality, RSRQ) more than or equal to 13dB, the PRS signal of location neighbor cell maybe be because Signal to Interference plus Noise Ratio (Signal to Interference and Noise Ratio; SINR) too little, ask in time domain can't correctly to obtain peak value in relevant.Therefore; In the present embodiment; UE is before judging whether to satisfy the interference eliminated entry condition; Can not surpass the 3rd preset thresholding through the ratio that obtains Serving cell and RSRP or the RSRQ of location neighbor cell among the current Occasion and do not start interference cancellation process, concrete, the 3rd preset thresholding is more than or equal to 13dB.
The method of the embodiment of the invention provides measurement and positioning neighbor cell reference signal time of advent; When Serving cell with by interfered cell PRS bandwidth and descending sub frame number when variant; Based on local location reference signals; On frequency domain or time domain, eliminate the interference of Serving cell respectively, and then obtain neighbor cell reference signal time of advent, make UE to locate the location neighbor cell PRS signal that disturbed.
Fig. 6 is the terminal sketch map of measurement and positioning neighbor cell reference signal time of advent of the embodiment of the invention one.As shown in Figure 6, the terminal of this measurement and positioning neighbor cell reference signal time of advent comprises: acquiring unit 5, judging unit 6 and interference cancellation unit 7.
Acquiring unit is used to obtain observation and arrives the time difference measurements assistance messages; Said observation arrives the time difference measurements assistance messages and comprises position reference cell information and location neighbor cell message, and said acquiring unit also is used for arriving the signal that the time difference measurements assistance messages receives the reference signal that contains neighbor cell location, location in the one-shot measurement chance according to observation.
UE obtains the OTDOA measurement assistance messages that high level issues through acquiring unit 5, and this measurement assistance messages comprises position reference cell information and location neighbor cell message.
Judging unit is used to judge whether the position reference sub-district is Serving cell, and whether is in this measuring machine meeting of a frequency layer with the location neighbor cell; Judging unit also is used to judge the entry condition of interference eliminated; If satisfy, then the signal enabling that receives is eliminated based on the frequency domain interference of local location reference signals and handled or based on the time domain interference elimination treatment of local location reference signals; Otherwise, start noiseless elimination and handle.
UE passes through judging unit 6, according to phyCellID in the position reference cell information of acquiring unit acquisition, and cellGoldballd, earfcn etc. judge whether the position reference sub-district is Serving cell; Service cell information according to acquiring unit obtains is relatively located earfcn and pre-mutingInfo in the neighbor cell message, judges whether this Serving cell is in the measuring machine meeting (Occasion) of same frequency layer with the location neighbor cell; According to the relation of the Serving cell PRS bandwidth and the PRS bandwidth of location neighbor cell or the relation of the Serving cell PRS descending sub frame number and the PRS descending sub frame number of location neighbor cell, judge whether to satisfy the entry condition of interference eliminated.
Interference cancellation unit 7 is used for the signal that receives is carried out handling or handling based on the time domain interference elimination treatment or the noiseless elimination of local location reference signals based on the frequency domain interference elimination of local location reference signals.
Relation between Serving cell PRS bandwidth that UE judges according to judging unit 6 and the location neighbor cell PRS bandwidth starts based on the frequency domain interference of local location reference signals and eliminates, to eliminate the interference of Serving cell to the location reference signals of location neighbor cell; Perhaps, according to judging unit 6 Serving cell PRS descending sub frame number of judging and the relation of locating neighbor cell PRS descending sub frame number, start time domain interference elimination treatment to received signal based on local location reference signals; If do not satisfy the interference elimination treatment of frequency domain or time domain, then start noiseless elimination and handle.
The terminal of present embodiment provides measurement and positioning neighbor cell reference signal time of advent; When Serving cell is in the one-shot measurement chance of a frequency layer with the location neighbor cell; When the PRS bandwidth of the location neighbor cell of judging Serving cell and being disturbed or descending sub frame number are variant; Based on local location reference signals; Eliminating of the interference of Serving cell PRS signal on the frequency domain or on the time domain respectively, improving UE and obtained the location neighbor cell observation accuracy of the time of advent, and then made UE accurately to locate neighbor cell PRS signal.
Fig. 7 is the terminal sketch map of measurement and positioning neighbor cell reference signal time of advent of eliminating based on the frequency domain interference of local location reference signals of the embodiment of the invention two.As shown in Figure 7, the terminal of this measurement and positioning neighbor cell reference signal time of advent, comprising: acquiring unit 5, frequency domain judging unit 61 and frequency domain interference are eliminated unit 71.
Acquiring unit 5; Be used to obtain observation and arrive the time difference measurements assistance messages; Said observation arrives the time difference measurements assistance messages and comprises position reference cell information and location neighbor cell message, and said acquiring unit also is used for arriving the time difference measurements assistance messages according to observation and receives the signal in the one-shot measurement chance that contains the location reference signals of locating neighbor cell in the one-shot measurement chance.
UE obtains the OTDOA measurement assistance messages that high level issues through acquiring unit 5, and this measurement assistance messages comprises position reference cell information and location neighbor cell message.
Frequency domain judging unit 61 is except phyCellID in the position reference cell information that obtains according to acquiring unit 5, cellGoldballd, and earfcn etc. judge whether the position reference sub-district is Serving cell; UE relatively locatees earfcn and pre-mutingInfo in the neighbor cell message according to service cell information, judges whether this Serving cell is in the measuring machine meeting (Occasion) of same frequency layer with the location neighbor cell; Also be used to judge the PRS bandwidth of the preset thresholding of PRS bandwidth * first≤location neighbor cell of Serving cell, promptly judge whether to satisfy the condition that frequency domain interference starts, wherein, first to preset thresholding be the real number greater than 1.
Frequency domain interference is eliminated unit 71, specifically comprises: the local first frequency domain reference signal generation unit 81, the local first time domain reference signal generation unit 82, first correlation unit 83 and very first time acquiring unit 84.
In the local first frequency domain reference signal generation unit 81; The OTDOA that UE obtains according to acquiring unit measures the PRS bandwidth information of the location neighbor cell in the assistance messages, produces to locate this locality first frequency domain reference signal that neighbor cell sends the interior PRS symbol of numDL-Frames field (descending sub frame).
In the local first time domain reference signal generation unit 82; In this locality first frequency domain reference signal that UE is produced the local first frequency domain reference signal generation unit; With the frequency-region signal zero setting in the PRS bandwidth of Serving cell, produce the local first time domain reference signal through IFFT.
UE is through in first correlation unit 83; With the symbol of this locality first time domain reference signal that is produced in the local first time domain reference signal generation unit and the signal correction of reception, obtain the correlation in the corresponding symbol, and repeat; To obtain correlation and the correlation in a plurality of subframe in the sub-frame; Through in the subframe relevant add and subframe between incoherent adding obtain the correlation that many subframes add up, and then obtain maximum correlation, to obtain the most powerful path time delay.
At last, in very first time acquiring unit, UE is according to the maximum correlation of the correlation in a plurality of subframes, obtains said location neighbor cell reference signal time of advent.
Frequency domain interference is eliminated the unit, and to go out the position reference sub-district in the frequency domain judgment unit judges be not that Serving cell or Serving cell and location neighbor cell are in the different measuring chance of no frequency layer; Perhaps Serving cell and location neighbor cell are in one the different measuring chance of frequency layer and the bandwidth of the bandwidth of Serving cell and location neighbor cell when not satisfying frequency domain interference and eliminating the condition that starts; Also be used to carry out the method for noiseless elimination; Observe the arrival time difference measurements; UE is positioned promptly conventional UE locate mode.
Fig. 8 is the terminal sketch map of measurement and positioning neighbor cell reference signal time of advent of satisfying the time domain interference eliminated of the embodiment of the invention three.As shown in Figure 8, the terminal of this measurement and positioning neighbor cell reference signal time of advent comprises: acquiring unit 5, time domain judging unit 62, time domain interference cancellation unit 72.
Acquiring unit 5; Be used to obtain observation and arrive the time difference measurements assistance messages; Said observation arrives the time difference measurements assistance messages and comprises position reference cell information and location neighbor cell message, and said acquiring unit also is used to receive the signal that contains the location reference signals of locating neighbor cell in the one-shot measurement chance.
UE obtains the OTDOA measurement assistance messages that high level issues through acquiring unit 5, and this measurement assistance messages comprises position reference cell information and location neighbor cell message.
Time domain judge module 62 is except according to phyCellID in the position reference cell information, cellGoldballd, and earfcn etc. judge whether the position reference sub-district is Serving cell; Relatively locate earfcn and pre-mutingInfo in the neighbor cell message according to service cell information, judge whether this Serving cell is in the measuring machine meeting (Occasion) of same frequency layer with the location neighbor cell; Whether PRS descending sub frame number * second threshold value that also is used to judge Serving cell promptly judges whether to satisfy time domain and disturbs the condition that starts smaller or equal to the PRS descending sub frame number of locating neighbor cell, and wherein, the first preset thresholding is the real number greater than 1.
Time domain interference cancellation unit 72 specifically comprises: the local second frequency domain reference signal generation unit 91, the local second time domain reference signal generation unit 92, second correlation unit 93 and second time acquisition unit 94.
In the local second frequency domain reference signal generation unit 91; The OTDOA that UE obtains according to acquiring unit measure the location neighbor cell in the assistance messages PRS expectedRSTD field and Serving cell and locate the numDL-Frames field of neighbor cell; Judge location neighbor cell reference signal and service cell reference signals expection subframe overlapping time; And according to expection subframe overlapping time and observation arriving the location neighbor cell PRS information in the time difference measurements assistance messages, produce in the corresponding subframe, in the neighbor cell descending sub frame number of location; Except that with Resource Unit (Resource element the overlapping subframe of Serving cell; RE) the local PRS frequency-region signal on, that is, the local second frequency domain reference signal.
In the local second time domain reference signal generation unit 92, this locality second frequency domain reference signal that UE is produced the local second frequency domain reference signal generation unit is through this locality second time domain reference signal after the IFFT conversion production interference eliminated.
UE is through in second correlation unit 93; With the symbol of this locality second time domain reference signal that is produced in the local second time domain reference signal generation unit and the signal correction of reception, obtain the correlation in the corresponding symbol, and repeat; To obtain correlation and the correlation in a plurality of subframe in the sub-frame; Through in the subframe relevant add and subframe between incoherent adding obtain the correlation that many subframes add up, and then obtain maximum correlation, to obtain the most powerful path time delay.
At last, in second time acquisition unit 94, UE is according to the maximum correlation of the correlation in a plurality of subframes, obtains said location neighbor cell reference signal time of advent.
It is not that Serving cell or Serving cell and location neighbor cell are in the different measuring chance of no frequency layer that the time domain interference cancellation unit goes out the position reference sub-district in the time domain judgment unit judges; Perhaps Serving cell and location neighbor cell are in one the different measuring chance of frequency layer and the descending sub frame number of the descending sub frame number of Serving cell and location neighbor cell when not satisfying the condition that the time domain interference eliminated starts; Also be used to carry out the method for noiseless elimination; Position the measurement that the neighbor cell reference signal reaches the time; UE is positioned promptly general UE locate mode.
Fig. 9 is another measurement and positioning neighbor cell reference signal of the present invention terminal sketch map of the time of advent.As shown in Figure 9, the terminal of this measurement and positioning neighbor cell reference signal time of advent comprises: anticipation break unit 0, acquiring unit 5, judging unit 6 and interference cancellation unit 7.In the present embodiment, the function of acquiring unit 5, judging unit 6 and interference cancellation unit 7 and configuration mode are with shown in Figure 6 identical, concrete, please with reference to Fig. 6.
The anticipation unit 0 that breaks; Be used to judge reception reference signal power (the Reference Singal Received Power of Serving cell and location neighbor cell; (Referecnce Singal Received Quality, whether ratio RSRQ) is more than or equal to 13dB for the reception reference signal quality of ratio RSRP) or Serving cell and location neighbor cell.
If the PRS signal of Serving cell arrives the signal strength signal intensity of UE arrives UE greater than the PRS signal of the location of location neighbor cell signal strength signal intensity 13dB (200 times); The PRS signal of location neighbor cell maybe be because Signal to Interference plus Noise Ratio (Signal to Interference and Noise Ratio; SINR) too little, ask in time domain can't correctly to obtain peak value in relevant.Therefore; The terminal that present embodiment provides; UE is before judging whether to satisfy the interference eliminated entry condition; Can not start interference cancellation process above the 3rd preset thresholding through the RSRP or the RSRQ of position reference sub-district among the disconnected current Occasion of unit judges of anticipation and location neighbor cell, concrete, the 3rd preset thresholding is more than or equal to 13dB.
In sum; Method and the device of measurement and positioning neighbor cell reference signal provided by the invention time of advent; When Serving cell with by interfered cell PRS bandwidth and descending sub frame number when variant,, on frequency domain or time domain, eliminate the interference of Serving cell respectively to the location neighbor cell PRS signal that disturbed based on local location reference signals; And then obtain neighbor cell reference signal time of advent, make UE to locate.
What should explain at last is: above each embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned each embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, perhaps to wherein part or all technical characteristic are equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (9)
1. the method for measurement and positioning neighbor cell reference signal time of advent is characterized in that, comprising:
Receive observation and arrive the time difference measurements assistance messages, said observation arrives the time difference measurements assistance messages and comprises position reference cell information and location neighbor cell message;
Arrive the time difference measurements assistance messages according to said observation, receive the signal of the location reference signals PRS that contains said location neighbor cell in the one-shot measurement chance;
Arrive the time difference measurements assistance messages according to said observation, judge whether said position reference sub-district is Serving cell, and whether said position reference sub-district is in the said one-shot measurement chance of a frequency layer with said location neighbor cell;
If being Serving cell and said position reference sub-district and said location neighbor cell, said position reference sub-district is in the said one-shot measurement chance of said frequency layer; Then further judge whether to satisfy the interference eliminated entry condition; If satisfy the interference eliminated entry condition, then the signal enabling of said reception is eliminated based on the frequency domain interference of local location reference signals and handled or based on the time domain interference elimination treatment of local location reference signals; Otherwise, start noiseless elimination and handle.
2. according to the described method of said claim 1, it is characterized in that, wherein:
Said interference eliminated entry condition is for eliminating the entry condition handled or based on the entry condition of the time domain interference elimination treatment of local location reference signals based on the frequency domain interference of local location reference signals;
It is that PRS bandwidth * first of said Serving cell preset the PRS bandwidth of thresholding≤said location neighbor cell that said frequency domain interference based on local location reference signals is eliminated the entry condition of handling;
The entry condition of the processing of said time domain interference eliminated based on local location reference signals is that PRS descending sub frame number * second of said Serving cell preset the PRS descending sub frame number of thresholding≤said location neighbor cell;
The said first preset thresholding and the said second preset thresholding are got respectively greater than 1 real number.
3. according to said claim 1 or 2 described methods, it is characterized in that said signal enabling to said reception is eliminated to handle based on the frequency domain interference of local location reference signals and comprised:
PRS information according to the said location neighbor cell in the said observation arrival time difference measurements assistance messages produces this locality first frequency domain reference signal that said location neighbor cell sends PRS symbol in the descending sub frame;
In the said local first frequency domain reference signal, the frequency-region signal zero setting in the PRS bandwidth of said Serving cell, and all the other signals after the zero setting are produced the local first time domain reference signal through inverse fast Fourier transform IFFT conversion;
The signal corresponding symbol of the symbol of the said local first time domain reference signal and said reception is relevant, obtain the correlation in the said symbol;
Repeat said process and obtain correlation and the correlation that further obtains in a plurality of subframes in the sub-frame;
According to the correlation in said a plurality of subframes, obtain said location neighbor cell reference signal time of advent.
4. according to said claim 1 or 2 described methods, it is characterized in that said signal enabling to said reception comprises based on the time domain interference elimination treatment of local location reference signals:
Arrive the numDL-Frames field of expectedRSTD field, numDL-Frames field and the said Serving cell of the said location neighbor cell in the time difference measurements assistance messages according to said observation, obtain the location reference signals expection subframe overlapping time of the location reference signals and the said location neighbor cell of said Serving cell;
Arrive the PRS information of the location neighbor cell in the time difference measurements assistance messages according to said expection subframe overlapping time and said observation, produce this locality second frequency domain reference signal of the PRS symbol of non-expection subframe in overlapping time in the transmission descending sub frame of said location neighbor cell;
With the said local second frequency domain reference signal, produce the local second time domain reference signal through the IFFT conversion;
The signal corresponding symbol of the symbol of the said local second time domain reference signal and said reception is relevant, obtain the correlation in the corresponding said symbol;
Repeat said process and obtain the correlation in the sub-frame, further obtain the correlation in a plurality of subframes;
According to the correlation in said a plurality of subframes, obtain said location neighbor cell reference signal time of advent.
5. according to each said method among the said claim 1-4, it is characterized in that, judge whether to satisfy the interference eliminated entry condition before, also comprise:
Judge whether the receiving location reference signals power of knowing said Serving cell and said location neighbor cell or the ratio that receives reference signal quality surpass the 3rd preset thresholding; When said ratio is preset thresholding above the 3rd, then continue to judge whether to satisfy the interference eliminated entry condition.
6. a terminal is characterized in that, comprising:
Acquiring unit; Be used to obtain observation and arrive the time difference measurements assistance messages; Said observation arrives the time difference measurements assistance messages and comprises position reference cell information and location neighbor cell message, and said acquiring unit also is used to receive the signal that contains the location reference signals of locating neighbor cell in the one-shot measurement chance;
Judging unit is used to judge whether said position reference sub-district is Serving cell, and whether said position reference sub-district is in the said one-shot measurement chance of a frequency layer with said location neighbor cell;
Be in the said one-shot measurement chance of said frequency layer if said position reference sub-district is Serving cell and said position reference sub-district and said location neighbor cell, then said judging unit is further judged the entry condition of interference eliminated; If satisfy, then the signal enabling of said reception is eliminated based on the frequency domain interference of local location reference signals and handled or based on the time domain interference elimination treatment of local location reference signals; If not, then starting noiseless elimination handles;
Interference cancellation unit is used for said reception signal is carried out handling or handling based on the time domain interference elimination treatment or the noiseless elimination of local location reference signals based on the frequency domain interference elimination of local location reference signals.
7. terminal according to claim 6 is characterized in that, wherein:
Said judging unit comprises frequency domain judging unit and/or time domain judging unit;
Said frequency domain judging unit; Be used to judge whether said interference eliminated satisfies the entry condition of eliminating based on the frequency domain interference of local location reference signals, the said entry condition of eliminating based on the frequency domain interference of local location reference signals is specially: PRS bandwidth * first of said Serving cell preset the PRS bandwidth of thresholding≤said location neighbor cell;
Said time domain judging unit; Be used to judge whether said interference eliminated satisfies the entry condition based on the time domain interference eliminated of local location reference signals, the entry condition of said time domain interference eliminated based on local location reference signals is specially: PRS descending sub frame number * second of said Serving cell preset the PRS descending sub frame number of thresholding≤said location neighbor cell;
The said first preset thresholding and the said second preset thresholding are got respectively greater than 1 real number.
8. according to claim 6 or 7 described terminals, it is characterized in that, wherein:
Said interference cancellation unit comprises frequency domain interference elimination unit and/or time domain interference cancellation unit, wherein:
Said frequency domain interference is eliminated the unit and is comprised at least:
The local first frequency domain reference signal generation unit; The observation that is used for obtaining according to said acquiring unit arrives the PRS information of the said location neighbor cell of time difference measurements assistance messages, produces this locality first frequency domain reference signal that said location neighbor cell sends PRS symbol in the descending sub frame;
The local first time domain reference signal generation unit; Be used for the said local first frequency domain reference signal; Frequency-region signal zero setting in the PRS bandwidth of said Serving cell, and all the other signals after the zero setting are produced the local first time domain reference signal through inverse fast Fourier transform IFFT conversion;
First correlation unit is used for the corresponding symbol of signal of the symbol of the said local first time domain reference signal and said reception relevantly, obtains the interior correlation of corresponding symbol; Repeat to obtain correlation and the correlation in a plurality of subframe in the sub-frame;
Very first time acquiring unit is used to obtain said location neighbor cell reference signal time of advent;
Said time domain interference cancellation unit comprises at least:
The local second frequency domain reference signal generation unit; Be used for arriving the numDL-Frames field of expectedRSTD field, numDL-Frames field and said Serving cell of the said location neighbor cell of time difference measurements assistance messages, the location reference signals expection subframe overlapping time of obtaining the location reference signals and the said location neighbor cell of said Serving cell according to said observation; According to said expection subframe overlapping time and said observation arriving the location neighbor cell PRS information in the time difference measurements assistance messages, produce this locality second frequency domain reference signal that said location neighbor cell sends the PRS symbol of non-expection subframe in overlapping time in the descending sub frame;
The local second time domain reference signal generation unit is used for the said local second frequency domain reference signal is produced the local second time domain reference signal through inverse fast Fourier transform IFFT conversion;
Second correlation unit is used for symbol and the relevant correlation that obtains in the corresponding symbol of the corresponding symbol of reception signal with the said local second time domain reference signal; Repeat the correlation that obtains in the sub-frame, further obtain the correlation in a plurality of subframes;
Second time acquisition unit is used to obtain said location neighbor cell reference signal time of advent.
9. according to the arbitrary described terminal of claim 6-8, it is characterized in that, also comprise:
The anticipation unit that breaks; Be used to judge the reception reference signal power of said Serving cell and said location neighbor cell or receive reference signal quality ratio and whether surpass the 3rd preset thresholding; When said ratio is preset thresholding above the 3rd, then continue to judge whether to satisfy the interference eliminated entry condition.
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