CN102869091B - Method and device for determining arrival time of location reference signals - Google Patents
Method and device for determining arrival time of location reference signals Download PDFInfo
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Abstract
The invention discloses a method and a device for determining the arrival time of location reference signals, relating to the technical field of communication. According to an embodiment of the invention, partial signals are respectively extracted from locally generated location reference signals and received location reference signals according to a specific extraction manner, and first association is carried on the partial signals extracted from the locally generated location reference signals and the partial signals extracted from the received location reference signals in a first search window; a second search window is determined according to the result of the first association, and if the signal to noise ratio of the first association is more than a first threshold value, second association is carried on the locally generated location reference signals and the received location reference signals in the second search window; and if the signal to noise ratio of the second association is more than a second threshold value, the arrival time of the received location reference signals is determined to be the result of the second association. According to the embodiment of the invention, the operation complexity and the operation time are reduced.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and the device of determining location reference signals time of advent.
Background technology
Wireless location technology utilizes cordless communication network, by measuring some parameters of the radio wave received, the position residing in sometime to a certain terminal according to specific algorithm measures, to provide relevant location information service for terminal use or to carry out real-time monitoring and tracking.Wireless location technology comprises the location technology based on cordless communication network, the location technology based on terminal and hybrid positioning technology.
Location technology based on cordless communication network mainly contains TOA(Time Of Arrival, the time of advent), CELLID(Cell ID, based on cell ID) and OTDOA(Observation Time Difference Of Arrival, observation arrives the time difference) etc.Wherein OTDOA is the technology that the multiple base station reference signals measured according to terminal position to the time difference (Reference Signal Time Difference, RSTD) of terminal, and concrete method comprises:
First, terminal receives the location reference signals that each community participating in location sends, and the local location reference signals producing each cell of origin, then, the location reference signals of each cell of origin that the location reference signals that terminal sends according to each community produces with this locality determines the time of advent of the location reference signals that each cell of origin received sends, the difference RSTD time of advent of the location reference signals that each cell of origin of further acquisition and position reference community send, multiple RSTD that network side can be measured by collection terminal realize the location to terminal.
The method of the time of advent of the location reference signals that each cell of origin that current terminal is determined to receive sends is that the location reference signals that the location reference signals that received by each community and described community are produced is correlated with in search window, and relevant according to this after position of peak value determine time of advent of the location reference signals of each cell of origin transmission received.At LTE(Long Term Evolution, Long Term Evolution) in system in order to improve the precision of terminal positioning, allow the location reference signals of community at 20M, 15M, 10M, 5M, 3M and 1.4M 6 kinds of bandwidth sends totally, the maximum magnitude allowing search window is 6144Ts, wherein Ts=1/30.72M, but because the complexity of related operation is determined by multiplication, and the number of times of process multiplication is limited in the terminal unit time, namely the multiplication quantity processed within the time that system requirements reports is limited, therefore the bandwidth of the location reference signals sent when community is comparatively large and search window is larger time, the method operand of terminal determination location reference signals time of advent will be very large, exceed the disposal ability of terminal sometimes.
Summary of the invention
The embodiment provides a kind of method and the device of determining location reference signals time of advent, the method operand solving current terminal determination location reference signals time of advent is large, exceeds the problem of terminal processing capacity.
Embodiments provide a kind of method determining the location reference signals time of advent, comprising:
Extracting part sub-signal the location reference signals produced from this locality respectively according to specific extraction mode and the location reference signals that receives, and the part signal extracted the described part signal that extracts from the location reference signals that this locality produces and the described location reference signals from receiving is carried out first in the first search window be correlated with;
The second search window is determined according to the result that described first is relevant;
If be greater than the first threshold value according to the first signal to noise ratio of being correlated with that the described first result of being correlated with is determined, then the location reference signals produced described this locality and the described location reference signals received carry out second and are correlated with in described second search window;
If be greater than the second threshold value according to the second signal to noise ratio of being correlated with that the described second result of being correlated with is determined, then the time of advent of the location reference signals received described in determining is the described second relevant result.
The embodiment of the present invention additionally provides a kind of device determining the location reference signals time of advent, comprising:
Abstraction module, according to specific extraction mode extracting part sub-signal from this locality location reference signals produced and the location reference signals received respectively;
First correlation module, is correlated with for the part signal extracted the part signal extracted from the location reference signals that this locality produces described in described abstraction module and the described location reference signals from receiving is carried out first in the first search window;
Search window update module, for determining the second search window according to the first result of being correlated with described in described first correlation module;
Second correlation module, if the first signal to noise ratio of being correlated with that the result for being correlated with according to first is determined is greater than the first threshold value, then carries out second in the second search window that the location reference signals produced described this locality and the described location reference signals received are determined in described search window update module and be correlated with;
The time of advent determination module, if the second relevant signal to noise ratio for determining according to the second relevant result is greater than the second threshold value, then the time of advent of the location reference signals received described in determining is the described second relevant result.
The technical scheme provided as can be seen from the embodiment of the invention described above, the time of advent of the location reference signals determined by the embodiment of the present invention, decreases computational complexity and operation time.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of flow chart determining the method for location reference signals time of advent that Fig. 1 provides for the embodiment of the present invention;
A kind of structural representation determining the device of location reference signals time of advent that Fig. 2 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of method determining the location reference signals time of advent, as shown in Figure 1, comprising:
11, extracting part sub-signal the location reference signals produced from this locality respectively according to specific extraction mode and the location reference signals that receives.
Particularly, terminal receives the OTDOA assistance data message that network side issues, and according to this OTDOA assistance data message receiving location reference signals, and produces location reference signals according to the information of carrying in this OTDOA assistance data message in this locality.
Further, from this locality location reference signals produced and the location reference signals received, the object of extracting part sub-signal is the complexity of carrying out related operation in order to reduce terminal, therefore extraction can be the extraction of signal in time domain, also can be the extraction of signal in frequency domain, also can be the extraction of signal in spatial domain, can also be that time-domain and frequency-domain combines, time domain is combined with spatial domain, frequency domain is combined with spatial domain and the extraction of signal is carried out in the combination of time domain, frequency domain and spatial domain.
As optionally, described specific extraction mode can comprise any one with under type:
One, the location reference signals of described this locality generation and the sample frequency extracting part sub-signal of the described location reference signals received is reduced.
Two, extract described this locality produce location reference signals and the described location reference signals nominated bandwidth received in signal.
Three, the signal in special symbol in the location reference signals of described this locality generation and a subframe of the described location reference signals received is extracted.
If the location reference signals that produces of four described this locality and the sub-frame number of the described location reference signals received are in equaling particular value, then extract the signal in wherein given sub-frame.
If the location reference signals that five described this locality produce and the number of transmission antennas of the described location reference signals received and the product of reception antenna quantity are more than or equal to designated value, then extract the signal on appointment transmitting antenna and/or reception antenna.
But because in the location reference signals produced from this locality and the location reference signals received, extracting part sub-signal may cause detection probability to reduce, therefore preferred detection probability reduces less, and complexity reduces larger abstracting method.(physical significance of detection probability there is this signal, the probability of this signal detected.) if such as bandwidth is 20M, subframe is 1,8 OFDM(OFDMs are had, Orthogonal Frequency Division Multiplexing in this subframe) symbol, 1 transmitting antenna, the detection probability of 2 reception antennas is 100%, then bandwidth is 10M, and subframe is 1, has 8 OFDM symbol in this subframe, 1 transmitting antenna, the detection probability of 2 reception antennas is 95%.Although both detection probability differences are very little, complexity differs 4 times.And if for example bandwidth is 10M, 2 subframes, have 8 OFDM symbol in a subframe, 1 transmitting antenna, the detection probability of 2 reception antennas is 99%, and so bandwidth is 10M, 6 subframes, have 8 OFDM symbol in a subframe, 1 transmitting antenna, the detection probability of 2 reception antennas is 100%.Although detection probability difference is very little, complexity differs 3 times.
The complexity of specifically carrying out related operation to reduce terminal is original 1/4, is specifically described the extraction of above-mentioned specific extraction mode to signal:
1) desampling fir filter being 2 by down-sampled rate in frequency domain completes the extraction of location reference signals.
Such as by down-sampled for the location reference signals of 20M or 15M filtering to the signal in 10M bandwidth, the down-sampled filtering of the location reference signals being about to receive to 10M, and produces the location reference signals in 10M bandwidth.
2) in time domain, set the sampled signal that down-sampled rate is 2 extraction location reference signals.
The location reference signals being about to location reference signals and the local generation received extracts every a bit.
3) in time domain, extract any two OFDM symbol in position reference signal subframe.
The such as signal of general cyclic prefix (Normal cyclic prefix) subframe internal symbol #3 and symbol #6, but be not limited to and meet #3 and #6.
4) if the sub-frame number of location reference signals is 4, then in time domain, the signal in one of them position reference signal subframe is extracted.
5) if the product of reception antenna and transmitting antenna is 4, then in spatial domain, the location reference signals that a reception antenna receives and the local location reference signals produced on a transmitting antenna is extracted.
6) if the number of transmitting antenna is 4, then in spatial domain, the local location reference signals produced on a transmitting antenna is extracted.
7) if the number of reception antenna is 4, then in spatial domain, the location reference signals that a reception antenna receives is extracted.
12, the described part signal extracted the part signal that extracts and the described location reference signals from receiving from the location reference signals that this locality produces is carried out first in the first search window to be correlated with.
Particularly, the center of usual first search window and size are that instruction in the OTDOA assistance data message issued by network side is determined.
The described part signal extracted the part signal that extracts and the described location reference signals from receiving from the location reference signals that this locality produces carry out in the first search window first relevant needed for multiplication number determined by the mode of extraction.Such as: set a reception antenna, a transmitting antenna, sample rate is 30.72M, a position reference signal subframe, this position reference signal subframe inner position reference signal is 8 OFDM symbol, during search window 512*Ts, it is Kue that the location reference signals received and the location reference signals that this locality produces carry out relevant required multiplication number in search window.So when NRx reception antenna, NTx transmitting antenna, down-sampled rate Dn, location reference signals comprises Nsubframe subframe, each subframe inner position reference signal is Nsymb OFDM symbol, when search window is W*Ts, the multiplication number of related operation is Kue*NRx*NTx*Nsubframe* (Nsymb/8) * (W/512) * (1/Dn) 2, and wherein Kue, Nsubframe, Nsymb, NRx, NTx and Dn are positive integer.
The result of 13, being correlated with according to described first determines the second search window.
Particularly, the estimated value of the strongest path position in described first community is determined according to the position of maximum in the described first result of being correlated with, described second search window centre position is determined according to the estimated value of the strongest described path position, the location reference signals that described second search window size is produced by described this locality and/or described in the Cyclic Prefix of location reference signals that receives determine, the length of general search window is 2 times of Cyclic Prefix, thus determines the second search window.
If 14 the first relevant signal to noise ratios determined according to the described first relevant result are more than or equal to the first threshold value, then the location reference signals produced described this locality and the described location reference signals received carry out second and are correlated with in described second search window.
This first threshold value can be determined according to emulation, and the false alarm probability that supposing the system requires is 10e-6, meets the lowest signal-to-noise value of false alarm probability, this snr value is set to the first thresholding by emulation under can obtaining this extraction condition.Extraction condition refers to OFDM symbol number in actual subframe, number of sub frames, bandwidth, antenna number.Wherein the physical significance of false alarm probability is the probability detecting this signal when not this signal.When the first relevant signal to noise ratio is less than the first threshold value, represent and signal do not detected in the signal received.Therefore represent that the location finding of the most powerful path of current correlation is failed.
Particularly, the first relevant signal to noise ratio be signal specific energy and with the energy of other signals and ratio.The division of signal specific and other signals has multiple method.Wherein a kind of method can according to correlation obtain the maximum of predetermined number and, the maximum of this predetermined number and as the energy of signal specific, in cumulative search window, other correlations are as the energy of other signals.Wherein the physical significance of predetermined number is the multipath number of channel.Another kind method can be multiplied by predetermined attenuation coefficient as thresholding according to the maximum of correlation, the cumulative all energy of correlation as signal specific being greater than this thresholding, and in cumulative search window, other correlations are as the energy of other signals.Wherein predetermined number, predetermined attenuation coefficient can be determined according to emulation, is also to determine according to the false alarm probability of system requirements.
If 15 the second relevant signal to noise ratios determined according to the described second relevant result are greater than the second threshold value, then the time of advent of the location reference signals received described in determining is the described second relevant result.
Particularly, some extraction mode reduces the resolution that RSTD measures, as fallen the extraction mode of bandwidth.Some extraction mode can change the noise profile in measurement, as down-sampled, reduces cumulative symbol, subframe and antenna number.Therefore adopt second to be correlated with in original signal dimension, in little search window, obtain the obtainable certainty of measurement of primary signal.
This second thresholding equally also can be determined according to emulation, and the false alarm probability that supposing the system requires is 10e-6, meets the lowest signal-to-noise value of false alarm probability, this signal to noise ratio is set to the second thresholding by emulation under can obtaining this condition.The physical significance of false alarm probability is the probability detecting this signal when not this signal.When the second relevant signal to noise ratio is less than the second threshold value, represent and signal do not detected in the signal received.Therefore represent that the location finding of the most powerful path of current correlation is failed.
As optionally, if the signal to noise ratio of being correlated with according to described first in step 14 is less than or equal to described first threshold value, then the location reference signals produced described this locality and the described location reference signals received carry out third phase pass in described first search window.The subsequent step that so this step is corresponding is then: if the signal to noise ratio that the third phase determined of result closed according to third phase closes is greater than described second threshold value, then the time of advent of the location reference signals received described in determining is the result that described third phase closes.The object of specifically carrying out third phase pass is after the verification and measurement ratio of process due to extraction reduction, undetected situation.
Can also comprise before execution step 11:
Judge the location reference signals that described this locality produces and/or described in the bandwidth of location reference signals that receives whether be more than or equal to the first predetermined value and, and judge whether the length of described first search window is more than or equal to the second predetermined value, if further the location reference signals that produces of described this locality and/or described in the bandwidth of location reference signals that receives be more than or equal to the first predetermined value and the length of described first search window is more than or equal to the second predetermined value, then according to specific extraction mode extracting part sub-signal from this locality location reference signals produced and the location reference signals received respectively.
Particularly, the computational complexity that this first predetermined value and the second predetermined value can be able to accept according to terminal is determined, the complexity that concrete hypothesis terminal can accept is Kc, and under the first predetermined value and the second predetermined value respective conditions, relevant complexity is necessarily greater than Kc.Engineering also may can reserve certain surplus, for generation of local location reference signals, the complexity of the computings such as the maximum value search of correlation and/or the calculating of RSTD.Namely relevant under the first predetermined value and the second predetermined value respective conditions complexity is necessarily greater than coef*Kc, and wherein coef is the real number between 0 ~ 1.
Further, the time of advent of the location reference signals that terminal sends according to above-mentioned each cell of origin determining that the method for location reference signals time of advent is determined, obtain the location reference signals difference time of advent RSTD that this cell of origin and adjacent positioned community send, make network side realize the location to terminal by multiple RSTD that collection terminal is measured.
The embodiment of the present invention additionally provides a kind of device determining the location reference signals time of advent, and this device can be installed and also can be used alone in the terminal, as shown in Figure 2, comprising:
Abstraction module 21, for extracting part sub-signal the location reference signals that produces from this locality respectively according to specific extraction mode and the location reference signals that receives.
Particularly, terminal receives the OTDOA assistance data message that network side issues, and according to this OTDOA assistance data message receiving location reference signals, and produces location reference signals according to the information of carrying in this OTDOA assistance data message in this locality.
Further, from this locality location reference signals produced and the location reference signals received, the object of extracting part sub-signal is the complexity of carrying out related operation in order to reduce terminal, therefore extraction can be the extraction of signal in time domain, also can be the extraction of signal in frequency domain, also can be the extraction of signal in spatial domain, can also be that time-domain and frequency-domain combines, time domain is combined with spatial domain, frequency domain is combined with spatial domain and the extraction of signal is carried out in the combination of time domain, frequency domain and spatial domain.
As optionally, described specific extraction mode can comprise any one with under type:
One, the location reference signals of described this locality generation and the sample frequency extracting part sub-signal of the described location reference signals received is reduced.
Two, extract described this locality produce location reference signals and the described location reference signals nominated bandwidth received in signal.
Three, the signal in special symbol in the location reference signals of described this locality generation and a subframe of the described location reference signals received is extracted.
If the location reference signals that produces of four described this locality and the sub-frame number of the described location reference signals received are in equaling particular value, then extract the signal in wherein given sub-frame.
If the location reference signals that five described this locality produce and the number of transmission antennas of the described location reference signals received and the product of reception antenna quantity are more than or equal to designated value, then extract the signal on appointment transmitting antenna and/or reception antenna.
But because in the location reference signals produced from this locality and the location reference signals received, extracting part sub-signal may cause detection probability to reduce, therefore preferred detection probability reduces less, and complexity reduces larger abstracting method.(physical significance of detection probability there is this signal, the probability of this signal detected.) if such as bandwidth is 20M, subframe is 1,8 OFDM(OFDMs are had, Orthogonal Frequency Division Multiplexing in this subframe) symbol, 1 transmitting antenna, the detection probability of 2 reception antennas is 100%, then bandwidth is 10M, and subframe is 1, has 8 OFDM symbol in this subframe, 1 transmitting antenna, the detection probability of 2 reception antennas is 95%.Although both detection probability differences are very little, complexity differs 4 times.And if for example bandwidth is 10M, 2 subframes, have 8 OFDM symbol in a subframe, 1 transmitting antenna, the detection probability of 2 reception antennas is 99%, and so bandwidth is 10M, 6 subframes, have 8 OFDM symbol in a subframe, 1 transmitting antenna, the detection probability of 2 reception antennas is 100%.Although detection probability difference is very little, complexity differs 3 times.
The complexity of specifically carrying out related operation to reduce terminal is original 1/4, is specifically described the extraction of above-mentioned specific extraction mode to signal:
1) desampling fir filter being 2 by down-sampled rate in frequency domain completes the extraction of location reference signals.
Such as by down-sampled for the location reference signals of 20M or 15M filtering to the signal in 10M bandwidth, the down-sampled filtering of the location reference signals being about to receive to 10M, and produces the location reference signals in 10M bandwidth.
2) in time domain, set the sampled signal that down-sampled rate is 2 extraction location reference signals.
The location reference signals being about to location reference signals and the local generation received extracts every a bit.
3) in time domain, extract any two OFDM symbol in position reference signal subframe.
The such as signal of general cyclic prefix (Normal cyclic prefix) subframe internal symbol #3 and symbol #6, but be not limited to and meet #3 and #6.
4) if the sub-frame number of location reference signals is 4, then in time domain, the signal in one of them position reference signal subframe is extracted.
5) if the product of reception antenna and transmitting antenna is 4, then in spatial domain, the location reference signals that a reception antenna receives and the local location reference signals produced on a transmitting antenna is extracted.
6) if the number of transmitting antenna is 4, then in spatial domain, the local location reference signals produced on a transmitting antenna is extracted.
7) if the number of reception antenna is 4, then in spatial domain, the location reference signals that a reception antenna receives is extracted.
First correlation module 22, is correlated with for the part signal extracted the part signal extracted from the location reference signals that this locality produces described in described abstraction module 21 and the described location reference signals from receiving is carried out first in the first search window.
Particularly, the center of usual first search window and size are that instruction in the OTDOA assistance data message issued by network side is determined.
The described part signal extracted the part signal that extracts and the described location reference signals from receiving from the location reference signals that this locality produces carry out in the first search window first relevant needed for multiplication number determined by the mode of extraction.Such as: set a reception antenna, a transmitting antenna, sample rate is 30.72M, a position reference signal subframe, this position reference signal subframe inner position reference signal is 8 OFDM symbol, during search window 512*Ts, it is Kue that the location reference signals received and the location reference signals that this locality produces carry out relevant required multiplication number in search window.So when NRx reception antenna, NTx transmitting antenna, down-sampled rate Dn, location reference signals comprises Nsubframe subframe, each subframe inner position reference signal is Nsymb OFDM symbol, when search window is W*Ts, the multiplication number of related operation is Kue*NRx*NTx*Nsubframe* (Nsymb/8) * (W/512) * (1/Dn) 2, and wherein Kue, Nsubframe, Nsymb, NRx, NTx and Dn are positive integer.
Search window update module 23, for determining the second search window according to the first result of being correlated with described in described first correlation module 22.
Particularly, the estimated value of the strongest path position in described first community is determined according to the position of maximum in the described first result of being correlated with, described second search window centre position is determined according to the estimated value of the strongest described path position, the location reference signals that described second search window size is produced by described this locality and/or described in the Cyclic Prefix of location reference signals that receives determine, the length of general search window is 2 times of Cyclic Prefix, thus determines the second search window.
Second correlation module 24, if the first signal to noise ratio of being correlated with that the result for being correlated with according to first is determined is greater than the first threshold value, then carries out second in the second search window that the location reference signals produced described this locality and the described location reference signals received are determined in described search window update module and be correlated with.
This first threshold value can be determined according to emulation, and the false alarm probability that supposing the system requires is 10e-6, meets the lowest signal-to-noise value of false alarm probability, this snr value is set to the first thresholding by emulation under can obtaining this extraction condition.Extraction condition refers to OFDM symbol number in actual subframe, number of sub frames, bandwidth, antenna number.Wherein the physical significance of false alarm probability is the probability detecting this signal when not this signal.When the first relevant signal to noise ratio is less than the first threshold value, represent and signal do not detected in the signal received.Therefore represent that the location finding of the most powerful path of current correlation is failed.
Particularly, the first relevant signal to noise ratio be signal specific energy and with the energy of other signals and ratio.The division of signal specific and other signals has multiple method.Wherein a kind of method can according to correlation obtain the maximum of predetermined number and, the maximum of this predetermined number and as the energy of signal specific, in cumulative search window, other correlations are as the energy of other signals.Wherein the physical significance of predetermined number is the multipath number of channel.Another kind method can be multiplied by predetermined attenuation coefficient as thresholding according to the maximum of correlation, the cumulative all energy of correlation as signal specific being greater than this thresholding, and in cumulative search window, other correlations are as the energy of other signals.Wherein predetermined number, predetermined attenuation coefficient can be determined according to emulation, is also to determine according to the false alarm probability of system requirements.
The time of advent determination module 25, if the second relevant signal to noise ratio for determining according to the second relevant result is greater than the second threshold value, then what receive described in determining determines
Particularly, some extraction mode reduces the resolution that RSTD measures, as fallen the extraction mode of bandwidth.Some extraction mode can change the noise profile in measurement, as down-sampled, reduces cumulative symbol, subframe and antenna number.Therefore adopt second to be correlated with in original signal dimension, in little search window, obtain the obtainable certainty of measurement of primary signal.
This second thresholding equally also can be determined according to emulation, and the false alarm probability that supposing the system requires is 10e-6, meets the lowest signal-to-noise value of false alarm probability, this signal to noise ratio is set to the second thresholding by emulation under can obtaining this condition.The physical significance of false alarm probability is the probability detecting this signal when not this signal.When the second relevant signal to noise ratio is less than the second threshold value, represent and signal do not detected in the signal received.Therefore represent that the location finding of the most powerful path of current correlation is failed.
As optionally, said apparatus can also comprise third phase and close module:
Third phase closes module, if be less than or equal to described first threshold value for the signal to noise ratio of being correlated with according to described first, then the location reference signals produced described this locality and the described location reference signals received carry out third phase pass in described first search window.The object of specifically carrying out third phase pass is after the verification and measurement ratio of process due to extraction reduction, undetected situation.
Described time of advent determination module 25, if the signal to noise ratio that the third phase also determined for the result of closing according to third phase closes is greater than described second threshold value, then the time of advent of the location reference signals received described in determining is the result that described third phase closes.
As optionally, said apparatus can also comprise judge module:
Judge module, for judge the location reference signals that described this locality produces and/or described in the bandwidth of location reference signals that receives whether be more than or equal to the first predetermined value, and judge whether the length of described first search window is more than or equal to the second predetermined value, if the location reference signals that described this locality produces and/or described in the bandwidth of location reference signals that receives be more than or equal to the first predetermined value and the length of described first search window is more than or equal to the second predetermined value, then perform described abstraction module.
Particularly, the computational complexity that this first predetermined value and the second predetermined value can be able to accept according to terminal is determined, the complexity that concrete hypothesis terminal can accept is Kc, and under the first predetermined value and the second predetermined value respective conditions, relevant complexity is necessarily greater than Kc.Engineering also may can reserve certain surplus, for generation of local location reference signals, the complexity of the computings such as the maximum value search of correlation and/or the calculating of RSTD.Namely relevant under the first predetermined value and the second predetermined value respective conditions complexity is necessarily greater than coef*Kc, and wherein coef is the real number between 0 ~ 1.
The specific implementation of the processing capacity of each module comprised in said apparatus describes in embodiment of the method before, in this no longer repeated description.
It should be noted that in above-mentioned node embodiment, included modules is carry out dividing according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional module, also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that all or part of step realized in above-mentioned each embodiment of the method is that the hardware that can carry out instruction relevant by program completes, corresponding program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The embodiment of the present invention is (when the carrying out of the Ji Gai community computation complexity of being correlated with is larger) when the bandwidth of the location reference signals of a certain community is larger, extract respectively this community send signal and this community location reference signals and redefine search window after carrying out first-phase pass, the first relevant signal to noise ratio meet signal that particular requirement Shi Jianggai community sends to pass through to the location reference signals of this community described in the search window that redefines carry out second relevant, and when the second signal to noise ratio of being correlated with meets particular requirement, the result that second is correlated with is defined as the time of advent of the location reference signals of this community, decrease computational complexity and operation time, terminal capability is made to obtain maximum application, and by making related operation more accurate to the renewal of search window.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. determine the method for the location reference signals time of advent, it is characterized in that, comprising:
Extracting part sub-signal the location reference signals produced from this locality respectively according to specific extraction mode and the location reference signals that receives, and the part signal extracted the described part signal that extracts from the location reference signals that this locality produces and the described location reference signals from receiving is carried out first in the first search window be correlated with;
The second search window is determined according to the result that described first is relevant;
If be greater than the first threshold value according to the first signal to noise ratio of being correlated with that the described first result of being correlated with is determined, then the location reference signals produced described this locality and the described location reference signals received carry out second and are correlated with in described second search window;
If be greater than the second threshold value according to the second signal to noise ratio of being correlated with that the described second result of being correlated with is determined, then the time of advent of the location reference signals received described in determining is the described second relevant result;
Wherein, describedly determine the second search window according to the described first relevant result, specifically comprise:
The estimated value of the strongest path position in described first community is determined according to the position of maximum in the described first result of being correlated with, determine described second search window centre position according to the estimated value of the strongest described path position, the location reference signals that described second search window size is produced by described this locality and/or described in the Cyclic Prefix of location reference signals that receives determine.
2. method according to claim 1, is characterized in that, described specific extraction mode comprises:
Reduce the location reference signals of described this locality generation and the sample frequency extracting part sub-signal of the described location reference signals received; Or
Extract described this locality produce location reference signals and the described location reference signals nominated bandwidth received in signal; Or
Extract the signal in special symbol in the location reference signals of described this locality generation and a subframe of the described location reference signals received; Or
If the location reference signals that produces of described this locality and the sub-frame number of the described location reference signals received are in equaling particular value, then extract the signal in wherein given sub-frame; Or
If the location reference signals that described this locality produces and the number of transmission antennas of the described location reference signals received and the product of reception antenna quantity are more than or equal to designated value, then extract the signal on appointment transmitting antenna and/or reception antenna.
3. method according to claim 1, is characterized in that, also comprises:
If be less than or equal to described first threshold value according to the signal to noise ratio that described first is relevant, then the location reference signals produced described this locality and the described location reference signals received carry out third phase pass in described first search window;
If the signal to noise ratio that the third phase determined of result closed according to third phase closes is greater than described second threshold value, then the time of advent of the location reference signals received described in determining is the result that described third phase closes.
4. the method according to any one of claim 1-3, is characterized in that, the location reference signals produced from this locality respectively according to specific extraction mode and the location reference signals received before extracting part sub-signal, also comprises:
If the location reference signals that described this locality produces and/or described in the bandwidth of location reference signals that receives be more than or equal to the first predetermined value and the length of described first search window is more than or equal to the second predetermined value, then extracting part sub-signal the location reference signals produced from this locality respectively according to specific extraction mode and the location reference signals received.
5. determine the device of the location reference signals time of advent, it is characterized in that, comprising:
Abstraction module, according to specific extraction mode extracting part sub-signal from this locality location reference signals produced and the location reference signals received respectively;
First correlation module, is correlated with for the part signal extracted the part signal extracted from the location reference signals that this locality produces described in described abstraction module and the described location reference signals from receiving is carried out first in the first search window;
Search window update module, for determining the second search window according to the first result of being correlated with described in described first correlation module;
Second correlation module, if the first signal to noise ratio of being correlated with that the result for being correlated with according to first is determined is greater than the first threshold value, then carries out second in the second search window that the location reference signals produced described this locality and the described location reference signals received are determined in described search window update module and be correlated with;
The time of advent determination module, if the second relevant signal to noise ratio for determining according to the second relevant result is greater than the second threshold value, then the time of advent of the location reference signals received described in determining is the described second relevant result;
Wherein, described search window update module, for determining the estimated value of the strongest path position in described first community according to the position of maximum in the described first relevant result, determine described second search window centre position according to the estimated value of the strongest described path position, the location reference signals that described second search window size is produced by described this locality and/or described in the Cyclic Prefix of location reference signals that receives determine.
6. device according to claim 5, is characterized in that, described in described abstraction module, specific extraction mode comprises:
Reduce the location reference signals of described this locality generation and the sample frequency extracting part sub-signal of the described location reference signals received; Or
Extract described this locality produce location reference signals and the described location reference signals nominated bandwidth received in signal; Or
Extract the signal in special symbol in the location reference signals of described this locality generation and a subframe of the described location reference signals received; Or
If the location reference signals that produces of described this locality and the sub-frame number of the described location reference signals received are in equaling particular value, then extract the signal in wherein given sub-frame; Or
If the location reference signals that described this locality produces and the number of transmission antennas of the described location reference signals received and the product of reception antenna quantity are more than or equal to designated value, then extract the signal on appointment transmitting antenna and/or reception antenna.
7. device according to claim 5, is characterized in that, also comprises:
Third phase closes module, if be less than or equal to described first threshold value for the signal to noise ratio of being correlated with according to described first, then the location reference signals produced described this locality and the described location reference signals received carry out third phase pass in described first search window;
Described time of advent determination module, if the signal to noise ratio that the third phase also determined for the result of closing according to third phase closes is greater than described second threshold value, then the time of advent of the location reference signals received described in determining is the result that described third phase closes.
8. the device according to any one of claim 5-7, is characterized in that, also comprises:
Judge module, for judge the location reference signals that described this locality produces and/or described in the bandwidth of location reference signals that receives whether be more than or equal to the first predetermined value, and judge whether the length of described first search window is more than or equal to the second predetermined value, if the location reference signals that described this locality produces and/or described in the bandwidth of location reference signals that receives be more than or equal to the first predetermined value and the length of described first search window is more than or equal to the second predetermined value, then perform described abstraction module.
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| US10660109B2 (en) * | 2016-11-16 | 2020-05-19 | Qualcomm Incorporated | Systems and methods to support multiple configurations for positioning reference signals in a wireless network |
| CN110381457B (en) * | 2019-08-29 | 2020-08-25 | 上海知白智能科技有限公司 | Indoor equipment positioning system and method |
| CN111163029B (en) * | 2019-12-27 | 2022-04-22 | 重庆物奇科技有限公司 | Method for searching positioning reference signal of enhanced machine type communication (e-MTC) |
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| CN101489238A (en) * | 2008-01-14 | 2009-07-22 | 大唐移动通信设备有限公司 | Time difference measuring method, system and apparatus |
| CN102131289A (en) * | 2011-04-20 | 2011-07-20 | 电子科技大学 | LTE (long term evolution) terminal wireless positioning system based on quick time-delay parameter search |
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| CN1787392A (en) * | 2005-12-16 | 2006-06-14 | 凯明信息科技股份有限公司 | Timing tracking and trapping device |
| CN101489238A (en) * | 2008-01-14 | 2009-07-22 | 大唐移动通信设备有限公司 | Time difference measuring method, system and apparatus |
| CN102131289A (en) * | 2011-04-20 | 2011-07-20 | 电子科技大学 | LTE (long term evolution) terminal wireless positioning system based on quick time-delay parameter search |
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